107 lines
3.7 KiB
Matlab
107 lines
3.7 KiB
Matlab
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function [CSX,port] = AddCircWaveGuidePort( CSX, prio, portnr, start, stop, radius, mode_name, pol_ang, exc_amp, varargin )
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% function [CSX,port] = AddCircWaveGuidePort( CSX, prio, portnr, start, stop, radius, mode_name, pol_ang, exc_amp, varargin )
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%
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% Create a circular 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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% radius: circular waveguide radius (in meter)
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% mode_name: mode name, e.g. 'TE11' or 'TM21'
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% pol_ang: polarization angle (e.g. 0 = horizontal, pi/2 = vertical)
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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 TE11 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<9)
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exc_amp = 0;
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end
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if (nargin<8)
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pol_ang = 0;
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end
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pnm = 0;
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n = str2double(mode_name(3));
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m = str2double(mode_name(4));
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% values by David M. Pozar, Microwave Engineering, third edition
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if ((n==0) && (m==1))
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pnm = 3.832;
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elseif ((n==1) && (m==1))
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pnm = 1.841;
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elseif ((n==2) && (m==1))
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pnm = 3.054;
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elseif ((n==0) && (m==2))
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pnm = 7.016;
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elseif ((n==1) && (m==2))
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pnm = 5.331;
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elseif ((n==2) && (m==2))
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pnm = 6.706;
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elseif ((n==0) && (m==3))
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pnm = 10.174;
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elseif ((n==1) && (m==3))
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pnm = 8.536;
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elseif ((n==2) && (m==3))
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pnm = 9.970;
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else
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error 'invalid TE_nm mode'
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end
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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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end
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unit = CSX.RectilinearGrid.ATTRIBUTE.DeltaUnit;
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kc = pnm/radius;
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kc_draw = kc*unit;
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angle = ['a-' num2str(pol_ang)];
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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_Er = [ num2str(-1/kc_draw^2,15) '/rho*cos(' angle ')*j1(' num2str(kc_draw,15) '*rho)'];
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func_Ea = [ num2str(1/kc_draw,15) '*sin(' angle ')*0.5*(j0(' num2str(kc_draw,15) '*rho)-jn(2,' num2str(kc_draw,15) '*rho))'];
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% magnetic field mode profile
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func_Hr = [ num2str(-1/kc_draw,15) '*sin(' angle ')*0.5*(j0(' num2str(kc_draw,15) '*rho)-jn(2,' num2str(kc_draw,15) '*rho))'];
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func_Ha = [ num2str(-1/kc_draw^2,15) '/rho*cos(' angle ')*j1(' num2str(kc_draw,15) '*rho)'];
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if (CSX.ATTRIBUTE.CoordSystem==1)
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func_E = {func_Er, func_Ea, 0};
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func_H = {func_Hr, func_Ha, 0};
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else
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func_Ex = ['(' func_Er '*cos(a) - ' func_Ea '*sin(a) ) * (rho<' num2str(radius/unit) ')'];
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func_Ey = ['(' func_Er '*sin(a) + ' func_Ea '*cos(a) ) * (rho<' num2str(radius/unit) ')'];
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func_E = {func_Ex, func_Ey, 0};
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func_Hx = ['(' func_Hr '*cos(a) - ' func_Ha '*sin(a) ) * (rho<' num2str(radius/unit) ')'];
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func_Hy = ['(' func_Hr '*sin(a) + ' func_Ha '*cos(a) ) * (rho<' num2str(radius/unit) ')'];
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func_H = {func_Hx, func_Hy, 0};
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end
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[CSX,port] = AddWaveGuidePort( CSX, prio, portnr, start, stop, 2, func_E, func_H, kc, exc_amp, varargin{:} );
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