From 8269fdfa57b4be8c079c85fbc416de6afa15a7b6 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jan=20K=C3=A4berich?= <j.kaeberich@gmx.de>
Date: Sat, 27 Nov 2021 19:11:45 +0100
Subject: [PATCH] de-embed touchstone-defined through

---
 .../SpectrumAnalyzer/spectrumanalyzer.cpp     |   2 +-
 .../PC_Application/Traces/Marker/marker.cpp   |   2 +-
 .../VNA/Deembedding/matchingnetwork.cpp       | 208 ++++-
 .../VNA/Deembedding/matchingnetwork.h         |  15 +-
 .../VNA/Deembedding/matchingnetworkdialog.ui  | 738 +++++++++---------
 Software/PC_Application/icons.qrc             |   8 +
 .../PC_Application/icons/definedThrough.png   | Bin 0 -> 884 bytes
 .../PC_Application/icons/definedThrough.svg   |  44 ++
 Software/PC_Application/icons/parallelC.png   | Bin 0 -> 466 bytes
 Software/PC_Application/icons/parallelL.png   | Bin 0 -> 1064 bytes
 Software/PC_Application/icons/parallelR.png   | Bin 0 -> 1077 bytes
 Software/PC_Application/icons/port1.svg       |  31 +
 Software/PC_Application/icons/port2.svg       |  31 +
 Software/PC_Application/icons/seriesC.png     | Bin 0 -> 361 bytes
 Software/PC_Application/icons/seriesL.png     | Bin 0 -> 808 bytes
 Software/PC_Application/icons/seriesR.png     | Bin 0 -> 759 bytes
 Software/PC_Application/touchstone.cpp        |  54 ++
 Software/PC_Application/touchstone.h          |   8 +-
 18 files changed, 744 insertions(+), 397 deletions(-)
 create mode 100644 Software/PC_Application/icons/definedThrough.png
 create mode 100644 Software/PC_Application/icons/definedThrough.svg
 create mode 100644 Software/PC_Application/icons/parallelC.png
 create mode 100644 Software/PC_Application/icons/parallelL.png
 create mode 100644 Software/PC_Application/icons/parallelR.png
 create mode 100644 Software/PC_Application/icons/seriesC.png
 create mode 100644 Software/PC_Application/icons/seriesL.png
 create mode 100644 Software/PC_Application/icons/seriesR.png

diff --git a/Software/PC_Application/SpectrumAnalyzer/spectrumanalyzer.cpp b/Software/PC_Application/SpectrumAnalyzer/spectrumanalyzer.cpp
index b66be51..1f497d4 100644
--- a/Software/PC_Application/SpectrumAnalyzer/spectrumanalyzer.cpp
+++ b/Software/PC_Application/SpectrumAnalyzer/spectrumanalyzer.cpp
@@ -315,7 +315,7 @@ nlohmann::json SpectrumAnalyzer::toJSON()
     tracking["enabled"] = settings.trackingGenerator ? true : false;
     tracking["port"] = settings.trackingGeneratorPort ? 2 : 1;
     tracking["offset"] = settings.trackingGeneratorOffset;
-    tracking["power"] = settings.trackingPower;
+    tracking["power"] = (double) settings.trackingPower / 100.0; // convert to dBm
     sweep["trackingGenerator"] = tracking;
 
     if(normalize.active) {
diff --git a/Software/PC_Application/Traces/Marker/marker.cpp b/Software/PC_Application/Traces/Marker/marker.cpp
index 0111c05..1e76a93 100644
--- a/Software/PC_Application/Traces/Marker/marker.cpp
+++ b/Software/PC_Application/Traces/Marker/marker.cpp
@@ -1560,7 +1560,7 @@ bool Marker::isMovable()
         // helper traces are never movable by the user
         return false;
     }
-    if(trace()->size() == 0) {
+    if(!parentTrace || parentTrace->size() == 0) {
         return false;
     }
     switch(type) {
diff --git a/Software/PC_Application/VNA/Deembedding/matchingnetwork.cpp b/Software/PC_Application/VNA/Deembedding/matchingnetwork.cpp
index f6592c0..3b08796 100644
--- a/Software/PC_Application/VNA/Deembedding/matchingnetwork.cpp
+++ b/Software/PC_Application/VNA/Deembedding/matchingnetwork.cpp
@@ -1,6 +1,8 @@
 #include "matchingnetwork.h"
 
 #include "ui_matchingnetworkdialog.h"
+#include "unit.h"
+#include "CustomWidgets/informationbox.h"
 
 #include <QDialog>
 #include <QHBoxLayout>
@@ -11,6 +13,7 @@
 #include <QMimeData>
 #include <algorithm>
 #include <QDebug>
+#include <QFileDialog>
 
 using namespace std;
 
@@ -83,24 +86,25 @@ void MatchingNetwork::edit()
     ui->lParallelC->installEventFilter(this);
     ui->lParallelL->installEventFilter(this);
     ui->lParallelR->installEventFilter(this);
+    ui->lDefinedThrough->installEventFilter(this);
     layout->setContentsMargins(0,0,0,0);
     layout->setSpacing(0);
     layout->addStretch(1);
     auto p1 = new QWidget();
-    p1->setMinimumSize(portWidth, 150);
-    p1->setMaximumSize(portWidth, 150);
+    p1->setMinimumSize(portWidth, 151);
+    p1->setMaximumSize(portWidth, 151);
     p1->setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Fixed);
-    p1->setStyleSheet("image: url(:/icons/port1.svg);");
+    p1->setStyleSheet("image: url(:/icons/port1.png);");
     auto DUT = new QWidget();
-    DUT->setMinimumSize(DUTWidth, 150);
-    DUT->setMaximumSize(DUTWidth, 150);
+    DUT->setMinimumSize(DUTWidth, 151);
+    DUT->setMaximumSize(DUTWidth, 151);
     DUT->setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Fixed);
-    DUT->setStyleSheet("image: url(:/icons/DUT.svg);");
+    DUT->setStyleSheet("image: url(:/icons/DUT.png);");
     auto p2 = new QWidget();
-    p2->setMinimumSize(portWidth, 150);
-    p2->setMaximumSize(portWidth, 150);
+    p2->setMinimumSize(portWidth, 151);
+    p2->setMaximumSize(portWidth, 151);
     p2->setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Fixed);
-    p2->setStyleSheet("image: url(:/icons/port2.svg);");
+    p2->setStyleSheet("image: url(:/icons/port2.png);");
     layout->addWidget(p1);
     for(auto w : p1Network) {
         layout->addWidget(w);
@@ -136,27 +140,31 @@ void MatchingNetwork::edit()
 nlohmann::json MatchingNetwork::toJSON()
 {
     nlohmann::json j;
-    for(int i=0;i<2;i++) {
-        auto network = i==0 ? p1Network : p2Network;
-        nlohmann::json jn;
-        for(auto c : network) {
-            nlohmann::json jc;
-            jc["component"] = c->getName().toStdString();
-            jc["params"] = c->toJSON();
-            jn.push_back(jc);
-        }
-        j.push_back(jn);
+    nlohmann::json jn1, jn2;
+    for(auto c : p1Network) {
+        nlohmann::json jc;
+        jc["component"] = c->getName().toStdString();
+        jc["params"] = c->toJSON();
+        jn1.push_back(jc);
     }
+    for(auto c : p2Network) {
+        nlohmann::json jc;
+        jc["component"] = c->getName().toStdString();
+        jc["params"] = c->toJSON();
+        jn2.push_back(jc);
+    }
+    j["port1"] = jn1;
+    j["port2"] = jn2;
+    j["addNetwork"] = addNetwork;
     return j;
 }
 
 void MatchingNetwork::fromJSON(nlohmann::json j)
 {
-    for(int i=0;i<2;i++) {
-        auto jn = j[i];
-        auto &network = i==0 ? p1Network : p2Network;
-        network.clear();
-        for(auto jc : jn) {
+    p1Network.clear();
+    p2Network.clear();
+    if(j.contains("port1")) {
+        for(auto jc : j["port1"]) {
             if(!jc.contains("component")) {
                 continue;
             }
@@ -165,9 +173,23 @@ void MatchingNetwork::fromJSON(nlohmann::json j)
                 continue;
             }
             c->fromJSON(jc["params"]);
-            network.push_back(c);
+            p1Network.push_back(c);
         }
     }
+    if(j.contains("port2")) {
+        for(auto jc : j["port2"]) {
+            if(!jc.contains("component")) {
+                continue;
+            }
+            auto c = MatchingComponent::createFromName(QString::fromStdString(jc["component"]));
+            if(!c) {
+                continue;
+            }
+            c->fromJSON(jc["params"]);
+            p2Network.push_back(c);
+        }
+    }
+    addNetwork = j.value("addNetwork", true);
     matching.clear();
 }
 
@@ -329,8 +351,8 @@ bool MatchingNetwork::eventFilter(QObject *object, QEvent *event)
                 dropComponent = (MatchingComponent*) dropPtr;
                 dragEvent->acceptProposedAction();
                 insertIndicator = new QWidget();
-                insertIndicator->setMinimumSize(2, 150);
-                insertIndicator->setMaximumSize(2, 150);
+                insertIndicator->setMinimumSize(2, imageHeight);
+                insertIndicator->setMaximumSize(2, imageHeight);
                 insertIndicator->setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Fixed);
                 insertIndicator->setStyleSheet("background-color:red;");
                 updateInsertIndicator(dragEvent->pos().x());
@@ -368,6 +390,8 @@ bool MatchingNetwork::eventFilter(QObject *object, QEvent *event)
                     dragComponent = new MatchingComponent(MatchingComponent::Type::ParallelL);
                 } else if(object->objectName() == "lParallelR") {
                     dragComponent = new MatchingComponent(MatchingComponent::Type::ParallelR);
+                } else if(object->objectName() == "lDefinedThrough") {
+                    dragComponent = new MatchingComponent(MatchingComponent::Type::DefinedThrough);
                 } else {
                     dragComponent = nullptr;
                 }
@@ -397,18 +421,21 @@ bool MatchingNetwork::eventFilter(QObject *object, QEvent *event)
 MatchingComponent::MatchingComponent(Type type)
 {
     this->type = type;
-    setMinimumSize(150, 150);
-    setMaximumSize(150, 150);
+    eValue = nullptr;
+    touchstone = nullptr;
+    touchstoneLabel = nullptr;
+    setMinimumSize(151, 151);
+    setMaximumSize(151, 151);
     setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Fixed);
-    eValue = new SIUnitEdit();
-    eValue->setPrecision(4);
-    eValue->setPrefixes("fpnum k");
-    connect(eValue, &SIUnitEdit::valueChanged, this, &MatchingComponent::valueChanged);
     setFocusPolicy(Qt::FocusPolicy::ClickFocus);
     switch(type) {
     case Type::SeriesR:
     case Type::SeriesL:
     case Type::SeriesC: {
+        eValue = new SIUnitEdit();
+        eValue->setPrecision(4);
+        eValue->setPrefixes("fpnum k");
+        connect(eValue, &SIUnitEdit::valueChanged, this, &MatchingComponent::valueChanged);
         auto layout = new QVBoxLayout();
         layout->addWidget(eValue);
         setLayout(layout);
@@ -417,13 +444,16 @@ MatchingComponent::MatchingComponent(Type type)
     case Type::ParallelR:
     case Type::ParallelL:
     case Type::ParallelC: {
+        eValue = new SIUnitEdit();
+        eValue->setPrecision(4);
+        eValue->setPrefixes("fpnum k");
+        connect(eValue, &SIUnitEdit::valueChanged, this, &MatchingComponent::valueChanged);
         auto layout = new QVBoxLayout();
         layout->addWidget(eValue);
         layout->addStretch(1);
         layout->setContentsMargins(9, 5, 9, 9);
         setLayout(layout);
     }
-        break;
     default:
         break;
     }
@@ -431,38 +461,58 @@ MatchingComponent::MatchingComponent(Type type)
     case Type::SeriesR:
         eValue->setUnit("Ω");
         eValue->setValue(50);
-        setStyleSheet("image: url(:/icons/seriesR.svg);");
+        setStyleSheet("image: url(:/icons/seriesR.png);");
         break;
     case Type::SeriesL:
         eValue->setUnit("H");
         eValue->setValue(1e-9);
-        setStyleSheet("image: url(:/icons/seriesL.svg);");
+        setStyleSheet("image: url(:/icons/seriesL.png);");
         break;
     case Type::SeriesC:
         eValue->setUnit("F");
         eValue->setValue(1e-12);
-        setStyleSheet("image: url(:/icons/seriesC.svg);");
+        setStyleSheet("image: url(:/icons/seriesC.png);");
         break;
     case Type::ParallelR:
         eValue->setUnit("Ω");
         eValue->setValue(50);
-        setStyleSheet("image: url(:/icons/parallelR.svg);");
+        setStyleSheet("image: url(:/icons/parallelR.png);");
         break;
     case Type::ParallelL:
         eValue->setUnit("H");
         eValue->setValue(1e-9);
-        setStyleSheet("image: url(:/icons/parallelL.svg);");
+        setStyleSheet("image: url(:/icons/parallelL.png);");
         break;
     case Type::ParallelC:
         eValue->setUnit("F");
         eValue->setValue(1e-12);
-        setStyleSheet("image: url(:/icons/parallelC.svg);");
+        setStyleSheet("image: url(:/icons/parallelC.png);");
+        break;
+    case Type::DefinedThrough: {
+        touchstone = new Touchstone(2);
+        touchstoneLabel = new QLabel();
+        touchstoneLabel->setWordWrap(true);
+        touchstoneLabel->setAlignment(Qt::AlignCenter);
+        auto layout = new QVBoxLayout();
+        layout->addWidget(touchstoneLabel);
+        layout->setContentsMargins(0, 0, 0, 0);
+        setLayout(layout);
+        setStyleSheet("image: url(:/icons/definedThrough.png);");
+        updateTouchstoneLabel();
+    }
         break;
     default:
         break;
     }
 }
 
+MatchingComponent::~MatchingComponent()
+{
+    delete eValue;
+    delete touchstone;
+    delete touchstoneLabel;
+}
+
 ABCDparam MatchingComponent::parameters(double freq)
 {
     switch(type) {
@@ -478,6 +528,15 @@ ABCDparam MatchingComponent::parameters(double freq)
         return ABCDparam(1.0, 0.0, 1.0/complex<double>(0, freq * 2 * M_PI * eValue->value()), 1.0);
     case Type::ParallelC:
         return ABCDparam(1.0, 0.0, 1.0/complex<double>(0, -1.0 / (freq * 2 * M_PI * eValue->value())), 1.0);
+    case Type::DefinedThrough:
+        if(touchstone->points() == 0 || freq < touchstone->minFreq() || freq > touchstone->maxFreq()) {
+            // outside of provided frequency range, pass through unchanged
+            return ABCDparam(1.0, 0.0, 0.0, 1.0);
+        } else {
+            auto d = touchstone->interpolate(freq);
+            auto S = Sparam(d.S[0], d.S[1], d.S[2], d.S[3]);
+            return ABCDparam(S, 50.0);
+        }
     default:
         return ABCDparam(1.0, 0.0, 0.0, 1.0);
     }
@@ -485,7 +544,9 @@ ABCDparam MatchingComponent::parameters(double freq)
 
 void MatchingComponent::MatchingComponent::setValue(double v)
 {
-    eValue->setValue(v);
+    if(eValue) {
+        eValue->setValue(v);
+    }
 }
 
 MatchingComponent *MatchingComponent::createFromName(QString name)
@@ -507,13 +568,73 @@ QString MatchingComponent::getName()
 nlohmann::json MatchingComponent::toJSON()
 {
     nlohmann::json j;
-    j["value"] = eValue->value();
+    switch(type) {
+    case Type::SeriesC:
+    case Type::SeriesR:
+    case Type::SeriesL:
+    case Type::ParallelC:
+    case Type::ParallelR:
+    case Type::ParallelL:
+        j["value"] = eValue->value();
+        break;
+    case Type::DefinedThrough:
+        j["touchstone"] = touchstone->toJSON();
+        break;
+    case Type::Last:
+        break;
+    }
     return j;
 }
 
 void MatchingComponent::fromJSON(nlohmann::json j)
 {
-    eValue->setValue(j.value("value", 1e-12));
+    switch(type) {
+    case Type::SeriesC:
+    case Type::SeriesR:
+    case Type::SeriesL:
+    case Type::ParallelC:
+    case Type::ParallelR:
+    case Type::ParallelL:
+        eValue->setValue(j.value("value", 1e-12));
+        break;
+    case Type::DefinedThrough:
+        touchstone->fromJSON(j["touchstone"]);
+        updateTouchstoneLabel();
+        break;
+    case Type::Last:
+        break;
+    }
+}
+
+void MatchingComponent::mouseDoubleClickEvent(QMouseEvent *e)
+{
+    Q_UNUSED(e);
+    if(type == Type::DefinedThrough) {
+        // select new touchstone file
+        auto filename = QFileDialog::getOpenFileName(nullptr, "Open measurement file", "", "Touchstone files (*.s2p)", nullptr, QFileDialog::DontUseNativeDialog);
+        if (!filename.isEmpty()) {
+            try {
+                *touchstone = Touchstone::fromFile(filename.toStdString());
+            } catch(const std::exception& e) {
+                InformationBox::ShowError("Failed to load file", QString("Attempt to load file ended with error: \"") + e.what()+"\"");
+            }
+            updateTouchstoneLabel();
+        }
+    }
+}
+
+void MatchingComponent::updateTouchstoneLabel()
+{
+    if(!touchstone || !touchstoneLabel) {
+        return;
+    }
+    if(touchstone->points() == 0) {
+        touchstoneLabel->setText("No data. Double-click to select touchstone file");
+    } else {
+        QString text = QString::number(touchstone->points()) + " points from "+Unit::ToString(touchstone->minFreq(), "Hz", " kMG", 4)
+                + " to "+Unit::ToString(touchstone->maxFreq(), "Hz", " kMG", 4);
+        touchstoneLabel->setText(text);
+    }
 }
 
 QString MatchingComponent::typeToName(MatchingComponent::Type type)
@@ -525,6 +646,7 @@ QString MatchingComponent::typeToName(MatchingComponent::Type type)
     case Type::ParallelR: return "ParallelR";
     case Type::ParallelL: return "ParallelL";
     case Type::ParallelC: return "ParallelC";
+    case Type::DefinedThrough: return "Touchstone Through";
     default: return "";
     }
 }
diff --git a/Software/PC_Application/VNA/Deembedding/matchingnetwork.h b/Software/PC_Application/VNA/Deembedding/matchingnetwork.h
index 7ea983e..afc1fc7 100644
--- a/Software/PC_Application/VNA/Deembedding/matchingnetwork.h
+++ b/Software/PC_Application/VNA/Deembedding/matchingnetwork.h
@@ -5,8 +5,10 @@
 #include "deembeddingoption.h"
 #include "Tools/parameters.h"
 #include "savable.h"
+#include "touchstone.h"
 
 #include <QWidget>
+#include <QLabel>
 #include <vector>
 
 
@@ -21,11 +23,13 @@ public:
         ParallelR,
         ParallelL,
         ParallelC,
+        DefinedThrough,
         // Add new matching components here, do not explicitly assign values and keep the Last entry at the last position
         Last,
     };
 
     MatchingComponent(Type type);
+    ~MatchingComponent();
     ABCDparam parameters(double freq);
     void setValue(double v);
 
@@ -40,7 +44,11 @@ signals:
     void deleted(MatchingComponent* m);
 protected:
     SIUnitEdit *eValue;
+    Touchstone *touchstone;
+    QLabel *touchstoneLabel;
 private:
+    void mouseDoubleClickEvent(QMouseEvent *e) override;
+    void updateTouchstoneLabel();
     static QString typeToName(Type type);
     Type type;
     void keyPressEvent(QKeyEvent *event) override;
@@ -62,9 +70,10 @@ public:
     nlohmann::json toJSON() override;
     void fromJSON(nlohmann::json j) override;
 private:
-    static constexpr int componentWidth = 150;
-    static constexpr int DUTWidth = 150;
-    static constexpr int portWidth = 75;
+    static constexpr int imageHeight = 151;
+    static constexpr int componentWidth = 151;
+    static constexpr int DUTWidth = 151;
+    static constexpr int portWidth = 76;
     MatchingComponent *componentAtPosition(int pos);
     unsigned int findInsertPosition(int xcoord);
     void addComponentAtPosition(int pos, MatchingComponent *c);
diff --git a/Software/PC_Application/VNA/Deembedding/matchingnetworkdialog.ui b/Software/PC_Application/VNA/Deembedding/matchingnetworkdialog.ui
index 2a52e6f..a1c67f3 100644
--- a/Software/PC_Application/VNA/Deembedding/matchingnetworkdialog.ui
+++ b/Software/PC_Application/VNA/Deembedding/matchingnetworkdialog.ui
@@ -7,7 +7,7 @@
     <x>0</x>
     <y>0</y>
     <width>772</width>
-    <height>442</height>
+    <height>443</height>
    </rect>
   </property>
   <property name="windowTitle">
@@ -131,20 +131,8 @@
          <property name="title">
           <string>Matching Components</string>
          </property>
-         <layout class="QVBoxLayout" name="verticalLayout_10">
-          <property name="leftMargin">
-           <number>0</number>
-          </property>
-          <property name="topMargin">
-           <number>0</number>
-          </property>
-          <property name="rightMargin">
-           <number>0</number>
-          </property>
-          <property name="bottomMargin">
-           <number>0</number>
-          </property>
-          <item>
+         <layout class="QGridLayout" name="gridLayout">
+          <item row="0" column="0" colspan="2">
            <widget class="QLabel" name="label_9">
             <property name="font">
              <font>
@@ -159,369 +147,423 @@
             </property>
            </widget>
           </item>
-          <item>
-           <layout class="QGridLayout" name="gridLayout">
-            <item row="0" column="0">
-             <widget class="QFrame" name="frame">
-              <property name="sizePolicy">
-               <sizepolicy hsizetype="Fixed" vsizetype="Fixed">
-                <horstretch>0</horstretch>
-                <verstretch>0</verstretch>
-               </sizepolicy>
-              </property>
-              <property name="minimumSize">
-               <size>
-                <width>80</width>
-                <height>80</height>
-               </size>
-              </property>
-              <property name="frameShape">
-               <enum>QFrame::StyledPanel</enum>
-              </property>
-              <property name="frameShadow">
-               <enum>QFrame::Raised</enum>
-              </property>
-              <layout class="QVBoxLayout" name="verticalLayout_2">
-               <property name="spacing">
-                <number>0</number>
+          <item row="1" column="0">
+           <widget class="QFrame" name="frame">
+            <property name="sizePolicy">
+             <sizepolicy hsizetype="Fixed" vsizetype="Fixed">
+              <horstretch>0</horstretch>
+              <verstretch>0</verstretch>
+             </sizepolicy>
+            </property>
+            <property name="minimumSize">
+             <size>
+              <width>80</width>
+              <height>80</height>
+             </size>
+            </property>
+            <property name="frameShape">
+             <enum>QFrame::StyledPanel</enum>
+            </property>
+            <property name="frameShadow">
+             <enum>QFrame::Raised</enum>
+            </property>
+            <layout class="QVBoxLayout" name="verticalLayout_2">
+             <property name="spacing">
+              <number>0</number>
+             </property>
+             <property name="leftMargin">
+              <number>0</number>
+             </property>
+             <property name="topMargin">
+              <number>0</number>
+             </property>
+             <property name="rightMargin">
+              <number>0</number>
+             </property>
+             <property name="bottomMargin">
+              <number>0</number>
+             </property>
+             <item>
+              <widget class="QLabel" name="lSeriesC">
+               <property name="styleSheet">
+                <string notr="true">border-image: url(:/icons/seriesC.svg);</string>
                </property>
-               <property name="leftMargin">
-                <number>0</number>
+               <property name="frameShape">
+                <enum>QFrame::NoFrame</enum>
                </property>
-               <property name="topMargin">
-                <number>0</number>
+               <property name="frameShadow">
+                <enum>QFrame::Plain</enum>
                </property>
-               <property name="rightMargin">
-                <number>0</number>
+               <property name="text">
+                <string>Series C</string>
                </property>
-               <property name="bottomMargin">
-                <number>0</number>
+               <property name="alignment">
+                <set>Qt::AlignCenter</set>
                </property>
-               <item>
-                <widget class="QLabel" name="lSeriesC">
-                 <property name="styleSheet">
-                  <string notr="true">border-image: url(:/icons/seriesC.svg);</string>
-                 </property>
-                 <property name="frameShape">
-                  <enum>QFrame::NoFrame</enum>
-                 </property>
-                 <property name="frameShadow">
-                  <enum>QFrame::Plain</enum>
-                 </property>
-                 <property name="text">
-                  <string>Series C</string>
-                 </property>
-                 <property name="alignment">
-                  <set>Qt::AlignCenter</set>
-                 </property>
-                </widget>
-               </item>
-              </layout>
-             </widget>
-            </item>
-            <item row="0" column="1">
-             <widget class="QFrame" name="frame_2">
-              <property name="sizePolicy">
-               <sizepolicy hsizetype="Fixed" vsizetype="Fixed">
-                <horstretch>0</horstretch>
-                <verstretch>0</verstretch>
-               </sizepolicy>
-              </property>
-              <property name="minimumSize">
-               <size>
-                <width>80</width>
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-               <enum>QFrame::Raised</enum>
-              </property>
-              <layout class="QVBoxLayout" name="verticalLayout_3">
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+             </item>
+            </layout>
+           </widget>
+          </item>
+          <item row="1" column="1">
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+             <sizepolicy hsizetype="Fixed" vsizetype="Fixed">
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+              <verstretch>0</verstretch>
+             </sizepolicy>
+            </property>
+            <property name="minimumSize">
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+              <height>80</height>
+             </size>
+            </property>
+            <property name="frameShape">
+             <enum>QFrame::StyledPanel</enum>
+            </property>
+            <property name="frameShadow">
+             <enum>QFrame::Raised</enum>
+            </property>
+            <layout class="QVBoxLayout" name="verticalLayout_3">
+             <property name="spacing">
+              <number>0</number>
+             </property>
+             <property name="leftMargin">
+              <number>0</number>
+             </property>
+             <property name="topMargin">
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+             </property>
+             <property name="rightMargin">
+              <number>0</number>
+             </property>
+             <property name="bottomMargin">
+              <number>0</number>
+             </property>
+             <item>
+              <widget class="QLabel" name="lSeriesL">
+               <property name="styleSheet">
+                <string notr="true">border-image: url(:/icons/seriesL.svg);</string>
                </property>
-               <property name="leftMargin">
-                <number>0</number>
+               <property name="frameShape">
+                <enum>QFrame::NoFrame</enum>
                </property>
-               <property name="topMargin">
-                <number>0</number>
+               <property name="frameShadow">
+                <enum>QFrame::Plain</enum>
                </property>
-               <property name="rightMargin">
-                <number>0</number>
+               <property name="text">
+                <string>Series L</string>
                </property>
-               <property name="bottomMargin">
-                <number>0</number>
+               <property name="alignment">
+                <set>Qt::AlignCenter</set>
                </property>
-               <item>
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-              <property name="minimumSize">
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-                <height>80</height>
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-              <property name="frameShadow">
-               <enum>QFrame::Raised</enum>
-              </property>
-              <layout class="QVBoxLayout" name="verticalLayout_4">
-               <property name="spacing">
-                <number>0</number>
+              </widget>
+             </item>
+            </layout>
+           </widget>
+          </item>
+          <item row="1" column="2">
+           <widget class="QFrame" name="frame_3">
+            <property name="sizePolicy">
+             <sizepolicy hsizetype="Fixed" vsizetype="Fixed">
+              <horstretch>0</horstretch>
+              <verstretch>0</verstretch>
+             </sizepolicy>
+            </property>
+            <property name="minimumSize">
+             <size>
+              <width>80</width>
+              <height>80</height>
+             </size>
+            </property>
+            <property name="frameShape">
+             <enum>QFrame::StyledPanel</enum>
+            </property>
+            <property name="frameShadow">
+             <enum>QFrame::Raised</enum>
+            </property>
+            <layout class="QVBoxLayout" name="verticalLayout_4">
+             <property name="spacing">
+              <number>0</number>
+             </property>
+             <property name="leftMargin">
+              <number>0</number>
+             </property>
+             <property name="topMargin">
+              <number>0</number>
+             </property>
+             <property name="rightMargin">
+              <number>0</number>
+             </property>
+             <property name="bottomMargin">
+              <number>0</number>
+             </property>
+             <item>
+              <widget class="QLabel" name="lSeriesR">
+               <property name="styleSheet">
+                <string notr="true">border-image: url(:/icons/seriesR.svg);</string>
                </property>
-               <property name="leftMargin">
-                <number>0</number>
+               <property name="frameShape">
+                <enum>QFrame::NoFrame</enum>
                </property>
-               <property name="topMargin">
-                <number>0</number>
+               <property name="frameShadow">
+                <enum>QFrame::Plain</enum>
                </property>
-               <property name="rightMargin">
-                <number>0</number>
+               <property name="text">
+                <string>Series R</string>
                </property>
-               <property name="bottomMargin">
-                <number>0</number>
+               <property name="alignment">
+                <set>Qt::AlignCenter</set>
                </property>
-               <item>
-                <widget class="QLabel" name="lSeriesR">
-                 <property name="styleSheet">
-                  <string notr="true">border-image: url(:/icons/seriesR.svg);</string>
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-                  <enum>QFrame::NoFrame</enum>
-                 </property>
-                 <property name="frameShadow">
-                  <enum>QFrame::Plain</enum>
-                 </property>
-                 <property name="text">
-                  <string>Series R</string>
-                 </property>
-                 <property name="alignment">
-                  <set>Qt::AlignCenter</set>
-                 </property>
-                </widget>
-               </item>
-              </layout>
-             </widget>
-            </item>
-            <item row="1" column="0">
-             <widget class="QFrame" name="frame_4">
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-               <sizepolicy hsizetype="Fixed" vsizetype="Fixed">
-                <horstretch>0</horstretch>
-                <verstretch>0</verstretch>
-               </sizepolicy>
-              </property>
-              <property name="minimumSize">
-               <size>
-                <width>80</width>
-                <height>80</height>
-               </size>
-              </property>
-              <property name="maximumSize">
-               <size>
-                <width>80</width>
-                <height>80</height>
-               </size>
-              </property>
-              <property name="frameShape">
-               <enum>QFrame::StyledPanel</enum>
-              </property>
-              <property name="frameShadow">
-               <enum>QFrame::Raised</enum>
-              </property>
-              <layout class="QVBoxLayout" name="verticalLayout_5">
-               <property name="spacing">
-                <number>0</number>
+              </widget>
+             </item>
+            </layout>
+           </widget>
+          </item>
+          <item row="1" column="3">
+           <widget class="QFrame" name="frame_7">
+            <property name="sizePolicy">
+             <sizepolicy hsizetype="Fixed" vsizetype="Fixed">
+              <horstretch>0</horstretch>
+              <verstretch>0</verstretch>
+             </sizepolicy>
+            </property>
+            <property name="minimumSize">
+             <size>
+              <width>80</width>
+              <height>80</height>
+             </size>
+            </property>
+            <property name="frameShape">
+             <enum>QFrame::StyledPanel</enum>
+            </property>
+            <property name="frameShadow">
+             <enum>QFrame::Raised</enum>
+            </property>
+            <layout class="QVBoxLayout" name="verticalLayout_10">
+             <property name="spacing">
+              <number>0</number>
+             </property>
+             <property name="leftMargin">
+              <number>0</number>
+             </property>
+             <property name="topMargin">
+              <number>0</number>
+             </property>
+             <property name="rightMargin">
+              <number>0</number>
+             </property>
+             <property name="bottomMargin">
+              <number>0</number>
+             </property>
+             <item>
+              <widget class="QLabel" name="lDefinedThrough">
+               <property name="styleSheet">
+                <string notr="true">border-image: url(:/icons/definedThrough.svg);</string>
                </property>
-               <property name="leftMargin">
-                <number>0</number>
+               <property name="frameShape">
+                <enum>QFrame::NoFrame</enum>
                </property>
-               <property name="topMargin">
-                <number>0</number>
+               <property name="frameShadow">
+                <enum>QFrame::Plain</enum>
                </property>
-               <property name="rightMargin">
-                <number>0</number>
+               <property name="text">
+                <string>&lt;html&gt;&lt;head/&gt;&lt;body&gt;&lt;p align=&quot;center&quot;&gt;&lt;br/&gt;&lt;br/&gt;Defined&lt;br/&gt;Through&lt;/p&gt;&lt;/body&gt;&lt;/html&gt;</string>
                </property>
-               <property name="bottomMargin">
-                <number>0</number>
+               <property name="alignment">
+                <set>Qt::AlignHCenter|Qt::AlignTop</set>
                </property>
-               <item>
-                <widget class="QLabel" name="lParallelC">
-                 <property name="styleSheet">
-                  <string notr="true">border-image: url(:/icons/parallelC.svg);</string>
-                 </property>
-                 <property name="frameShape">
-                  <enum>QFrame::NoFrame</enum>
-                 </property>
-                 <property name="frameShadow">
-                  <enum>QFrame::Plain</enum>
-                 </property>
-                 <property name="text">
-                  <string>Parallel C</string>
-                 </property>
-                 <property name="alignment">
-                  <set>Qt::AlignHCenter|Qt::AlignTop</set>
-                 </property>
-                </widget>
-               </item>
-              </layout>
-             </widget>
-            </item>
-            <item row="1" column="1">
-             <widget class="QFrame" name="frame_5">
-              <property name="sizePolicy">
-               <sizepolicy hsizetype="Fixed" vsizetype="Fixed">
-                <horstretch>0</horstretch>
-                <verstretch>0</verstretch>
-               </sizepolicy>
-              </property>
-              <property name="minimumSize">
-               <size>
-                <width>80</width>
-                <height>80</height>
-               </size>
-              </property>
-              <property name="frameShape">
-               <enum>QFrame::StyledPanel</enum>
-              </property>
-              <property name="frameShadow">
-               <enum>QFrame::Raised</enum>
-              </property>
-              <layout class="QVBoxLayout" name="verticalLayout_6">
-               <property name="spacing">
-                <number>0</number>
+              </widget>
+             </item>
+            </layout>
+           </widget>
+          </item>
+          <item row="2" column="0">
+           <widget class="QFrame" name="frame_4">
+            <property name="sizePolicy">
+             <sizepolicy hsizetype="Fixed" vsizetype="Fixed">
+              <horstretch>0</horstretch>
+              <verstretch>0</verstretch>
+             </sizepolicy>
+            </property>
+            <property name="minimumSize">
+             <size>
+              <width>80</width>
+              <height>80</height>
+             </size>
+            </property>
+            <property name="maximumSize">
+             <size>
+              <width>80</width>
+              <height>80</height>
+             </size>
+            </property>
+            <property name="frameShape">
+             <enum>QFrame::StyledPanel</enum>
+            </property>
+            <property name="frameShadow">
+             <enum>QFrame::Raised</enum>
+            </property>
+            <layout class="QVBoxLayout" name="verticalLayout_5">
+             <property name="spacing">
+              <number>0</number>
+             </property>
+             <property name="leftMargin">
+              <number>0</number>
+             </property>
+             <property name="topMargin">
+              <number>0</number>
+             </property>
+             <property name="rightMargin">
+              <number>0</number>
+             </property>
+             <property name="bottomMargin">
+              <number>0</number>
+             </property>
+             <item>
+              <widget class="QLabel" name="lParallelC">
+               <property name="styleSheet">
+                <string notr="true">border-image: url(:/icons/parallelC.svg);</string>
                </property>
-               <property name="leftMargin">
-                <number>0</number>
+               <property name="frameShape">
+                <enum>QFrame::NoFrame</enum>
                </property>
-               <property name="topMargin">
-                <number>0</number>
+               <property name="frameShadow">
+                <enum>QFrame::Plain</enum>
                </property>
-               <property name="rightMargin">
-                <number>0</number>
+               <property name="text">
+                <string>Parallel C</string>
                </property>
-               <property name="bottomMargin">
-                <number>0</number>
+               <property name="alignment">
+                <set>Qt::AlignHCenter|Qt::AlignTop</set>
                </property>
-               <item>
-                <widget class="QLabel" name="lParallelL">
-                 <property name="minimumSize">
-                  <size>
-                   <width>0</width>
-                   <height>0</height>
-                  </size>
-                 </property>
-                 <property name="styleSheet">
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-                 </property>
-                 <property name="frameShape">
-                  <enum>QFrame::NoFrame</enum>
-                 </property>
-                 <property name="frameShadow">
-                  <enum>QFrame::Plain</enum>
-                 </property>
-                 <property name="text">
-                  <string>Parallel L</string>
-                 </property>
-                 <property name="alignment">
-                  <set>Qt::AlignHCenter|Qt::AlignTop</set>
-                 </property>
-                </widget>
-               </item>
-              </layout>
-             </widget>
-            </item>
-            <item row="1" column="2">
-             <widget class="QFrame" name="frame_6">
-              <property name="sizePolicy">
-               <sizepolicy hsizetype="Fixed" vsizetype="Fixed">
-                <horstretch>0</horstretch>
-                <verstretch>0</verstretch>
-               </sizepolicy>
-              </property>
-              <property name="minimumSize">
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-                <width>80</width>
-                <height>80</height>
-               </size>
-              </property>
-              <property name="frameShape">
-               <enum>QFrame::StyledPanel</enum>
-              </property>
-              <property name="frameShadow">
-               <enum>QFrame::Raised</enum>
-              </property>
-              <layout class="QVBoxLayout" name="verticalLayout_7">
-               <property name="spacing">
-                <number>0</number>
+              </widget>
+             </item>
+            </layout>
+           </widget>
+          </item>
+          <item row="2" column="1">
+           <widget class="QFrame" name="frame_5">
+            <property name="sizePolicy">
+             <sizepolicy hsizetype="Fixed" vsizetype="Fixed">
+              <horstretch>0</horstretch>
+              <verstretch>0</verstretch>
+             </sizepolicy>
+            </property>
+            <property name="minimumSize">
+             <size>
+              <width>80</width>
+              <height>80</height>
+             </size>
+            </property>
+            <property name="frameShape">
+             <enum>QFrame::StyledPanel</enum>
+            </property>
+            <property name="frameShadow">
+             <enum>QFrame::Raised</enum>
+            </property>
+            <layout class="QVBoxLayout" name="verticalLayout_6">
+             <property name="spacing">
+              <number>0</number>
+             </property>
+             <property name="leftMargin">
+              <number>0</number>
+             </property>
+             <property name="topMargin">
+              <number>0</number>
+             </property>
+             <property name="rightMargin">
+              <number>0</number>
+             </property>
+             <property name="bottomMargin">
+              <number>0</number>
+             </property>
+             <item>
+              <widget class="QLabel" name="lParallelL">
+               <property name="minimumSize">
+                <size>
+                 <width>0</width>
+                 <height>0</height>
+                </size>
                </property>
-               <property name="leftMargin">
-                <number>0</number>
+               <property name="styleSheet">
+                <string notr="true">border-image: url(:/icons/parallelL.svg);</string>
                </property>
-               <property name="topMargin">
-                <number>0</number>
+               <property name="frameShape">
+                <enum>QFrame::NoFrame</enum>
                </property>
-               <property name="rightMargin">
-                <number>0</number>
+               <property name="frameShadow">
+                <enum>QFrame::Plain</enum>
                </property>
-               <property name="bottomMargin">
-                <number>0</number>
+               <property name="text">
+                <string>Parallel L</string>
                </property>
-               <item>
-                <widget class="QLabel" name="lParallelR">
-                 <property name="styleSheet">
-                  <string notr="true">border-image: url(:/icons/parallelR.svg);</string>
-                 </property>
-                 <property name="frameShape">
-                  <enum>QFrame::NoFrame</enum>
-                 </property>
-                 <property name="frameShadow">
-                  <enum>QFrame::Plain</enum>
-                 </property>
-                 <property name="text">
-                  <string>Parallel R</string>
-                 </property>
-                 <property name="alignment">
-                  <set>Qt::AlignHCenter|Qt::AlignTop</set>
-                 </property>
-                </widget>
-               </item>
-              </layout>
-             </widget>
-            </item>
-           </layout>
+               <property name="alignment">
+                <set>Qt::AlignHCenter|Qt::AlignTop</set>
+               </property>
+              </widget>
+             </item>
+            </layout>
+           </widget>
+          </item>
+          <item row="2" column="2">
+           <widget class="QFrame" name="frame_6">
+            <property name="sizePolicy">
+             <sizepolicy hsizetype="Fixed" vsizetype="Fixed">
+              <horstretch>0</horstretch>
+              <verstretch>0</verstretch>
+             </sizepolicy>
+            </property>
+            <property name="minimumSize">
+             <size>
+              <width>80</width>
+              <height>80</height>
+             </size>
+            </property>
+            <property name="frameShape">
+             <enum>QFrame::StyledPanel</enum>
+            </property>
+            <property name="frameShadow">
+             <enum>QFrame::Raised</enum>
+            </property>
+            <layout class="QVBoxLayout" name="verticalLayout_7">
+             <property name="spacing">
+              <number>0</number>
+             </property>
+             <property name="leftMargin">
+              <number>0</number>
+             </property>
+             <property name="topMargin">
+              <number>0</number>
+             </property>
+             <property name="rightMargin">
+              <number>0</number>
+             </property>
+             <property name="bottomMargin">
+              <number>0</number>
+             </property>
+             <item>
+              <widget class="QLabel" name="lParallelR">
+               <property name="styleSheet">
+                <string notr="true">border-image: url(:/icons/parallelR.svg);</string>
+               </property>
+               <property name="frameShape">
+                <enum>QFrame::NoFrame</enum>
+               </property>
+               <property name="frameShadow">
+                <enum>QFrame::Plain</enum>
+               </property>
+               <property name="text">
+                <string>Parallel R</string>
+               </property>
+               <property name="alignment">
+                <set>Qt::AlignHCenter|Qt::AlignTop</set>
+               </property>
+              </widget>
+             </item>
+            </layout>
+           </widget>
           </item>
          </layout>
         </widget>
diff --git a/Software/PC_Application/icons.qrc b/Software/PC_Application/icons.qrc
index b4b2c2f..148fb55 100644
--- a/Software/PC_Application/icons.qrc
+++ b/Software/PC_Application/icons.qrc
@@ -50,5 +50,13 @@
         <file>icons/down.png</file>
         <file>icons/up.png</file>
         <file>icons/chainlink.png</file>
+        <file>icons/definedThrough.svg</file>
+        <file>icons/seriesR.png</file>
+        <file>icons/seriesL.png</file>
+        <file>icons/seriesC.png</file>
+        <file>icons/parallelR.png</file>
+        <file>icons/parallelL.png</file>
+        <file>icons/parallelC.png</file>
+        <file>icons/definedThrough.png</file>
     </qresource>
 </RCC>
diff --git a/Software/PC_Application/icons/definedThrough.png b/Software/PC_Application/icons/definedThrough.png
new file mode 100644
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diff --git a/Software/PC_Application/icons/port2.svg b/Software/PC_Application/icons/port2.svg
index f98b346..9ead629 100644
--- a/Software/PC_Application/icons/port2.svg
+++ b/Software/PC_Application/icons/port2.svg
@@ -1,12 +1,43 @@
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 <svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" width="56.693pt" height="113.386pt" viewBox="0 0 56.693 113.386" version="1.1">
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diff --git a/Software/PC_Application/icons/seriesC.png b/Software/PC_Application/icons/seriesC.png
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diff --git a/Software/PC_Application/touchstone.cpp b/Software/PC_Application/touchstone.cpp
index 555667e..5525dbe 100644
--- a/Software/PC_Application/touchstone.cpp
+++ b/Software/PC_Application/touchstone.cpp
@@ -384,3 +384,57 @@ QString Touchstone::getFilename() const
 {
     return filename;
 }
+
+nlohmann::json Touchstone::toJSON()
+{
+    nlohmann::json j;
+    j["ports"] = m_ports;
+    j["filename"] = filename.toStdString();
+    if(m_datapoints.size() > 0) {
+        nlohmann::json json_points;
+        for(auto d : m_datapoints) {
+            nlohmann::json point;
+            point["frequency"] = d.frequency;
+            nlohmann::json sparams;
+            for(auto s : d.S) {
+                nlohmann::json sparam;
+                sparam["real"] = s.real();
+                sparam["imag"] = s.imag();
+                sparams.push_back(sparam);
+            }
+            point["Sparams"] = sparams;
+            json_points.push_back(point);
+        }
+        j["datapoints"] = json_points;
+    }
+    return j;
+}
+
+void Touchstone::fromJSON(nlohmann::json j)
+{
+    m_datapoints.clear();
+    filename = QString::fromStdString(j.value("filename", ""));
+    m_ports = j.value("ports", 0);
+    if(!m_ports || !j.contains("datapoints")) {
+        return;
+    }
+    auto json_points = j["datapoints"];
+    for(auto point : json_points) {
+        Datapoint d;
+        if(!point.contains("frequency") || !point.contains("Sparams")) {
+            // missing data, abort here
+            qWarning() << "Touchstone data point does not contain frequency or S parameters";
+            break;
+        }
+        d.frequency = point["frequency"];
+        if(point["Sparams"].size() != m_ports * m_ports) {
+            // invalid number of Sparams, abort here
+            qWarning() << "Invalid number of S parameters, got" << point["Sparams"].size() << "expected" << m_ports*m_ports;
+            break;
+        }
+        for(auto Sparam : point["Sparams"]) {
+            d.S.push_back(complex<double>(Sparam.value("real", 0.0), Sparam.value("imag", 0.0)));
+        }
+        m_datapoints.push_back(d);
+    }
+}
diff --git a/Software/PC_Application/touchstone.h b/Software/PC_Application/touchstone.h
index a73b4ce..fa34fa1 100644
--- a/Software/PC_Application/touchstone.h
+++ b/Software/PC_Application/touchstone.h
@@ -1,12 +1,14 @@
 #ifndef TOUCHSTONE_H
 #define TOUCHSTONE_H
 
+#include "savable.h"
+
 #include <complex>
 #include <vector>
 #include <string>
 #include <QString>
 
-class Touchstone
+class Touchstone : public Savable
 {
 public:
     enum class Scale {
@@ -29,6 +31,7 @@ public:
     };
 
     Touchstone(unsigned int m_ports);
+    virtual ~Touchstone(){};
     void AddDatapoint(Datapoint p);
     void toFile(std::string filename, Scale unit = Scale::GHz, Format format = Format::RealImaginary);
     std::stringstream toString(Scale unit = Scale::GHz, Format format = Format::RealImaginary);
@@ -45,6 +48,9 @@ public:
     unsigned int ports() { return m_ports; }
     QString getFilename() const;
 
+    virtual nlohmann::json toJSON();
+    virtual void fromJSON(nlohmann::json j);
+
 private:
     unsigned int m_ports;
     std::vector<Datapoint> m_datapoints;