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| LICENSE | ||
| README.md | ||
| RF Directional Bridge-cache.lib | ||
| RF Directional Bridge.kicad_pcb | ||
| RF Directional Bridge.kicad_pcb-bak | ||
| RF Directional Bridge.net | ||
| RF Directional Bridge.pdf | ||
| RF Directional Bridge.pro | ||
| RF Directional Bridge.sch | ||
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| ieee_paper.pdf | ||
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README.md
RF_DIRECTIONAL_BRIDGE
300 KHz to 13.5 GHz Directional Bridge with 16 dB coupling and 1dB Insertion Loss
The source of design is: https://ieeexplore.ieee.org/document/7345756
IEEE pdf file can be seen as ieee_paper.pdf
R1^2 = R2 x Zo
S21 = R1 / (Zo + R1)
S32 = R1 / (R2 + R1)
For 16dB coupling and 1dB insertion loss calculated values are:
R1 = 50 Ohm (transmission line impedance), R2 = 230 Ohm, Zo = 6.17 Ohm (Connect 4 parallel 24-25 Ohm)
As a balun transformer use RG405 Coax cable with 77, 43 and T46 toroids on it.
VNA Measurements:
S-parameters with a commercial VNA up to 10 GHz. Coupler was measured as a two port with third port terminated with a high quality termination from the VNA calibration kit.