153 lines
3.7 KiB
Matlab
153 lines
3.7 KiB
Matlab
function pass = cavity
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physical_constants;
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ENABLE_PLOTS = 1;
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CLEANUP = 0; % if enabled and result is PASS, remove simulation folder
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STOP_IF_FAILED = 1; % if enabled and result is FAILED, stop with error
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% LIMITS
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upper_error = 0.036; % max +3.6%
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lower_error = 0; % max -0.0%
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% structure
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a = 5e-2;
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b = 2e-2;
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d = 6e-2;
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if ~((b<a) && (a<d))
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error 'correct the dimensions of the cavity'
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end
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f_start = 0;
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f_stop = 10e9;
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Sim_Path = 'tmp';
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Sim_CSX = 'cavity.xml';
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[status,message,messageid]=mkdir(Sim_Path);
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%setup FDTD parameter
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FDTD = InitFDTD( 10000,1e-6 );
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FDTD = SetGaussExcite(FDTD,(f_stop-f_start)/2,(f_stop-f_start)/2);
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BC = [0 0 0 0 0 0]; % PEC boundaries
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FDTD = SetBoundaryCond(FDTD,BC);
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%setup CSXCAD geometry
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CSX = InitCSX();
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mesh.x = linspace(0,a,35);
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mesh.y = linspace(0,b,35);
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mesh.z = linspace(0,d,35);
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CSX = DefineRectGrid(CSX, 1,mesh);
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% excitation
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pos1 = [mesh.x(10) mesh.y(10) mesh.z(10)];
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pos2 = [mesh.x(10) mesh.y(11) mesh.z(10)];
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CSX = AddExcitation(CSX,'excite',1,[0 1 0]);
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CSX = AddBox(CSX, 'excite', 1, pos1, pos2);
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% %dump
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% CSX = AddDump(CSX,'Et_',0,2);
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% pos1 = [mesh.x(1) mesh.y(10) mesh.z(1)];
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% pos2 = [mesh.x(end) mesh.y(10) mesh.z(end)];
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% CSX = AddBox(CSX,'Et_',0 , pos1,pos2);
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%
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% %dump
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% CSX = AddDump(CSX,'Et2_',0,2);
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% pos1 = [mesh.x(1) mesh.y(1) mesh.z(1)];
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% pos2 = [mesh.x(end) mesh.y(1) mesh.z(end)];
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% CSX = AddBox(CSX,'Et2_',0 , pos1,pos2);
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%
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% %dump
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% CSX = AddDump(CSX,'Et3_',0,2);
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% pos1 = [mesh.x(1) mesh.y(end-1) mesh.z(1)];
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% pos2 = [mesh.x(end) mesh.y(end-1) mesh.z(end)];
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% CSX = AddBox(CSX,'Et3_',0 , pos1,pos2);
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%voltage calc
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pos1 = [mesh.x(15) mesh.y(15) mesh.z(15)];
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pos2 = [mesh.x(15) mesh.y(16) mesh.z(15)];
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CSX = AddProbe(CSX,'ut1y',0);
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CSX = AddBox(CSX,'ut1y', 0 ,pos1,pos2);
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pos1 = [mesh.x(floor(end/2)) mesh.y(floor(end/2)) mesh.z(end)];
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pos2 = [mesh.x(floor(end/2)) mesh.y(floor(end/2)) mesh.z(end-1)];
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CSX = AddProbe(CSX,'ut1z',0);
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CSX = AddBox(CSX,'ut1z', 0 ,pos1,pos2);
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%Write openEMS compatible xml-file
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WriteOpenEMS([Sim_Path '/' Sim_CSX],FDTD,CSX);
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%cd to working dir and run openEMS
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savePath = pwd();
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cd(Sim_Path); %cd to working dir
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invoke_openEMS( Sim_CSX );
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UI = ReadUI( {'ut1x', 'ut1y', 'ut1z'} );
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cd(savePath);
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%
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% analysis
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%
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f = UI.FD{1}.f;
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ux = UI.FD{1}.val;
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uy = UI.FD{2}.val;
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uz = UI.FD{3}.val;
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f_idx_start = interp1( f, 1:numel(f), f_start, 'nearest' );
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f_idx_stop = interp1( f, 1:numel(f), f_stop, 'nearest' );
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f = f(f_idx_start:f_idx_stop);
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ux = ux(f_idx_start:f_idx_stop);
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uy = uy(f_idx_start:f_idx_stop);
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uz = uz(f_idx_start:f_idx_stop);
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% analytic formula for resonant wavenumber
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k = @(m,n,l) sqrt( (m*pi/a)^2 + (n*pi/b)^2 + (l*pi/d)^2 );
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f_TE101 = c0/(2*pi) * k(1,0,1);
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f_TE102 = c0/(2*pi) * k(1,0,2);
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f_TE103 = c0/(2*pi) * k(1,0,3);
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f_TE201 = c0/(2*pi) * k(2,0,1);
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f_TE202 = c0/(2*pi) * k(2,0,2);
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f_TM110 = c0/(2*pi) * k(1,1,0);
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f_TM210 = c0/(2*pi) * k(2,1,0);
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f_TE = [f_TE101 f_TE102 f_TE103 f_TE201 f_TE202];
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f_TM = [f_TM110 f_TM210];
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if ENABLE_PLOTS
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figure
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plot(f/1e9,abs(uy))
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max1 = max(abs(uy));
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hold on
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plot( repmat(f_TE,2,1)/1e9, repmat([0; max1],1,numel(f_TE)), 'm-.', 'LineWidth', 2 )
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xlabel('Frequency (GHz)')
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legend( {'u_y','theoretical'} );
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figure
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plot(f/1e9,abs(uz))
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max1 = max(abs(uz));
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hold on
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plot( repmat(f_TM,2,1)/1e9, repmat([0; max1],1,numel(f_TM)), 'm-.', 'LineWidth', 2 )
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xlabel('Frequency (GHz)')
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legend( {'u_z','theoretical'} );
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end
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pass = 1;
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% pass = check_limits( Z, upper_limit, lower_limit );
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% if pass
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% disp( 'combinedtests/Coax.m (characteristic impedance): pass' );
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% else
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% disp( 'combinedtests/Coax.m (characteristic impedance): * FAILED *' );
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% end
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if pass && CLEANUP
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rmdir( [Sim_Path '/' Sim_CSX], 's' );
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end
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if ~pass && STOP_IF_FAILED
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error 'test failed';
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end
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