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Diffstat (limited to 'openEMS/matlab/AddWaveGuidePort.m')
| -rw-r--r-- | openEMS/matlab/AddWaveGuidePort.m | 119 |
1 files changed, 119 insertions, 0 deletions
diff --git a/openEMS/matlab/AddWaveGuidePort.m b/openEMS/matlab/AddWaveGuidePort.m new file mode 100644 index 0000000..1a17db2 --- /dev/null +++ b/openEMS/matlab/AddWaveGuidePort.m @@ -0,0 +1,119 @@ +function [CSX,port] = AddWaveGuidePort( CSX, prio, portnr, start, stop, dir, E_WG_func, H_WG_func, kc, exc_amp, varargin ) +% function [CSX,port] = AddWaveGuidePort( CSX, prio, portnr, start, stop, dir, E_WG_func, H_WG_func, kc, exc_amp, varargin ) +% +% Create a waveguide port, including an optional excitation and probes +% +% Note: - The excitation will be located at the start position in the given direction +% - The voltage and current probes at the stop position in the given direction +% +% parameter: +% CSX: complete CSX structure (must contain a mesh) +% prio: priority of primitives +% start: start coordinates of waveguide port box +% stop: stop coordinates of waveguide port box +% dir: direction of port (0/1/2 or 'x'/'y'/'z'-direction) +% E_WG_func: electric field mode profile function as a string +% H_WG_func: magnetic field mode profile function as a string +% kc: cutoff wavenumber (defined by the waveguide dimensions) +% exc_amp: excitation amplitude (set 0 to be passive) +% +% optional (key/values): +% varargin: optional additional excitations options, see also AddExcitation +% 'PortNamePrefix': a prefix to the port name +% +% output: +% CSX: modified CSX structure +% port: port structure to use with calcPort +% +% example: +% % create a TE11 circular waveguide mode, using cylindircal coordinates +% p11 = 1.841; +% kc = p11 / radius; % cutoff wavenumber with radius in meter +% kc_draw = kc*unit; % cutoff wavenumber in drawing units +% +% % electric field mode profile +% func_E{1} = [ num2str(-1/kc_draw^2,15) '/rho*cos(a)*j1(' num2str(kc_draw,15) '*rho)']; +% func_E{2} = [ num2str(1/kc_draw,15) '*sin(a)*0.5*(j0(' num2str(kc_draw,15) '*rho)-jn(2,' num2str(kc_draw,15) '*rho))']; +% func_E{3} = 0; +% +% % magnetic field mode profile +% func_H{1} = [ '-1*' num2str(1/kc_draw,15) '*sin(a)*0.5*(j0(' num2str(kc_draw,15) '*rho)-jn(2,' num2str(kc_draw,15) '*rho))']; +% func_H{2} = [ num2str(-1/kc_draw^2,15) '/rho*cos(a)*j1(' num2str(kc_draw,15) '*rho)']; +% func_H{3} = 0; +% +% start=[mesh.r(1) mesh.a(1) 0 ]; +% stop =[mesh.r(end) mesh.a(end) 100]; +% [CSX, port{1}] = AddWaveGuidePort(CSX, 0, 1, start, stop, 2, func_E, func_H, kc, 1); +% +% openEMS matlab interface +% ----------------------- +% (c) 2013 Thorsten Liebig (thorsten.liebig@gmx.de) +% +% See also InitCSX, AddExcitation, calcWGPort, calcPort + +%check mesh +if ~isfield(CSX,'RectilinearGrid') + error 'mesh needs to be defined! Use DefineRectGrid() first!'; +end + +dir = DirChar2Int(dir); + +port.type='WaveGuide'; +port.nr=portnr; +port.kc = kc; +port.dir = dir; +port.drawingunit = CSX.RectilinearGrid.ATTRIBUTE.DeltaUnit; + +PortNamePrefix = ''; + +varargin_tmp = varargin; +for n=1:2:numel(varargin_tmp) + if strcmpi('PortNamePrefix',varargin_tmp{n}) + PortNamePrefix = varargin_tmp{n+1}; + varargin([n n+1]) = []; + end +end + +% matlab adressing +dir = dir + 1; +dir_sign = sign(stop(dir) - start(dir)); +if (dir_sign==0) + dir_sign = 1; +end + +port.direction = dir_sign; + +E_WG_func{dir} = 0; +H_WG_func{dir} = 0; + +port.excite = 0; +if (exc_amp~=0) + if (start(dir)==stop(dir)) + error 'if waveguide port is to be excited, the length in propagation direction must not be zero' + end + e_start = start; + e_stop = stop; + e_stop(dir) = e_start(dir); + port.excite = 1; + port.excitepos = e_start(dir); + e_vec = [1 1 1]*exc_amp; + e_vec(dir) = 0; + exc_name = [PortNamePrefix 'port_excite_' num2str(portnr)]; + CSX = AddExcitation( CSX, exc_name, 0, e_vec, varargin{:}); + CSX = SetExcitationWeight(CSX, exc_name, E_WG_func ); + CSX = AddBox( CSX, exc_name, prio, e_start, e_stop); +end + +% voltage/current planes +m_start = start; +m_stop = stop; +m_start(dir) = stop(dir); + +port.measplanepos = m_start(dir); +port.U_filename = [PortNamePrefix 'port_ut' int2str(portnr)]; +CSX = AddProbe(CSX, port.U_filename, 10, 'ModeFunction', E_WG_func); +CSX = AddBox(CSX, port.U_filename, 0 ,m_start, m_stop); + +port.I_filename = [PortNamePrefix 'port_it' int2str(portnr)]; +CSX = AddProbe(CSX, port.I_filename, 11, 'ModeFunction', H_WG_func, 'weight', dir_sign); +CSX = AddBox(CSX, port.I_filename, 0 ,m_start, m_stop); |