90 lines
3.2 KiB
Matlab
90 lines
3.2 KiB
Matlab
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function [CSX,port] = AddRectWaveGuidePort( CSX, prio, portnr, start, stop, dir, a, b, mode_name, exc_amp, varargin )
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% function [CSX,port] = AddRectWaveGuidePort( CSX, prio, portnr, start, stop, dir, a, b, mode_name, exc_amp, varargin )
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%
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% Create a rectangular waveguide port, including an optional excitation and probes
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%
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% Note: - The excitation will be located at the start position in the given direction
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% - The voltage and current probes at the stop position in the given direction
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%
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% input:
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% CSX: complete CSX structure (must contain a mesh)
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% prio: priority of primitives
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% start: start coordinates of waveguide port box
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% stop: stop coordinates of waveguide port box
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% dir: direction of port (0/1/2 for x/y/z-direction)
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% a,b: rectangular waveguide width and height (in meter)
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% mode_name: mode name, e.g. 'TE11' or 'TM21'
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% exc_amp: excitation amplitude (set 0 to be passive)
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% varargin: optional additional excitations options, see also AddExcitation
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%
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% output:
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% CSX: modified CSX structure
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% port: port structure to use with calcPort
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%
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% example:
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% % create a TE10 circular waveguide mode, using cylindircal coordinates
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% start=[mesh.r(1) mesh.a(1) 0 ];
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% stop =[mesh.r(end) mesh.a(end) 100];
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% [CSX,port] = AddCircWaveGuidePort( CSX, 99, 1, start, stop, 320e-3, 'TE11', 0, 1);
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%
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% openEMS matlab interface
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% -----------------------
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% (c) 2013 Thorsten Liebig (thorsten.liebig@gmx.de)
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%
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% See also InitCSX, AddExcitation, calcWGPort, calcPort
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if (~strcmpi(mode_name(1:2),'TE'))
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error 'currently only TE type modes are supported'
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end
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if (nargin<10)
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exc_amp = 0;
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end
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m = str2double(mode_name(3));
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n = str2double(mode_name(4));
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% values by David M. Pozar, Microwave Engineering, third edition
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kc = sqrt((m*pi/a)^2 + (n*pi/b)^2);
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if ~isfield(CSX,'RectilinearGrid')
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error 'mesh needs to be defined! Use DefineRectGrid() first!';
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if (~isfield(CSX.RectilinearGrid,'XLines') || ~isfield(CSX.RectilinearGrid,'YLines') || ~isfield(CSX.RectilinearGrid,'ZLines'))
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error 'mesh needs to be defined! Use DefineRectGrid() first!';
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end
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end
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unit = CSX.RectilinearGrid.ATTRIBUTE.DeltaUnit;
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kc_draw = kc*unit;
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dir_names={'x','y','z'};
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dirP = mod((dir+1),3)+1;
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dirPP = mod((dir+2),3)+1;
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nameX = ['(' dir_names{dirP} '-' num2str(start(dirP)) ')'];
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nameY = ['(' dir_names{dirPP} '-' num2str(start(dirPP)) ')'];
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%convert a&b to drawing units
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a = a/unit;
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b = b/unit;
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% functions by David M. Pozar, Microwave Engineering, third edition
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% electric field mode profile
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func_Ex = [num2str( n/b) '*cos(' num2str(m*pi/a) '*' nameX ')*sin(' num2str(n*pi/b) '*' nameY ')'];
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func_Ey = [num2str(-m/a) '*sin(' num2str(m*pi/a) '*' nameX ')*cos(' num2str(n*pi/b) '*' nameY ')'];
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% magnetic field mode profile
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func_Hx = [num2str(m/a) '*sin(' num2str(m*pi/a) '*' nameX ')*cos(' num2str(n*pi/b) '*' nameY ')'];
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func_Hy = [num2str(n/b) '*cos(' num2str(m*pi/a) '*' nameX ')*sin(' num2str(n*pi/b) '*' nameY ')'];
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func_E{dir+1} = 0;
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func_E{dirP} = func_Ex;
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func_E{dirPP} = func_Ey;
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func_H{dir+1} = 0;
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func_H{dirP} = func_Hx;
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func_H{dirPP} = func_Hy;
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[CSX,port] = AddWaveGuidePort( CSX, prio, portnr, start, stop, dir, func_E, func_H, kc, exc_amp, varargin{:} );
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