1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
|
function [CSX,port] = AddRectWaveGuidePort( CSX, prio, portnr, start, stop, dir, a, b, mode_name, exc_amp, varargin )
% function [CSX,port] = AddRectWaveGuidePort( CSX, prio, portnr, start, stop, dir, a, b, mode_name, exc_amp, varargin )
%
% Create a rectangular 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
%
% input:
% 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)
% a,b: rectangular waveguide width and height (in meter)
% mode_name: mode name, e.g. 'TE11' or 'TM21'
% 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 TE10 circular waveguide mode, using cylindircal coordinates
% start=[mesh.r(1) mesh.a(1) 0 ];
% stop =[mesh.r(end) mesh.a(end) 100];
% [CSX,port] = AddCircWaveGuidePort( CSX, 99, 1, start, stop, 320e-3, 'TE11', 0, 1);
%
% openEMS matlab interface
% -----------------------
% (c) 2013 Thorsten Liebig (thorsten.liebig@gmx.de)
%
% See also InitCSX, AddExcitation, calcWGPort, calcPort
if (~strcmpi(mode_name(1:2),'TE'))
error 'currently only TE type modes are supported'
end
if (nargin<10)
exc_amp = 0;
end
m = str2double(mode_name(3));
n = str2double(mode_name(4));
% values by David M. Pozar, Microwave Engineering, third edition
kc = sqrt((m*pi/a)^2 + (n*pi/b)^2);
if ~isfield(CSX,'RectilinearGrid')
error 'mesh needs to be defined! Use DefineRectGrid() first!';
if (~isfield(CSX.RectilinearGrid,'XLines') || ~isfield(CSX.RectilinearGrid,'YLines') || ~isfield(CSX.RectilinearGrid,'ZLines'))
error 'mesh needs to be defined! Use DefineRectGrid() first!';
end
end
unit = CSX.RectilinearGrid.ATTRIBUTE.DeltaUnit;
dir = DirChar2Int(dir);
dir_names={'x','y','z'};
dirP = mod((dir+1),3)+1;
dirPP = mod((dir+2),3)+1;
nameX = ['(' dir_names{dirP} '-' num2str(start(dirP)) ')'];
nameY = ['(' dir_names{dirPP} '-' num2str(start(dirPP)) ')'];
%convert a&b to drawing units
a = a/unit;
b = b/unit;
% functions by David M. Pozar, Microwave Engineering, third edition
% electric field mode profile
func_Ex = [num2str( n/b) '*cos(' num2str(m*pi/a) '*' nameX ')*sin(' num2str(n*pi/b) '*' nameY ')'];
func_Ey = [num2str(-m/a) '*sin(' num2str(m*pi/a) '*' nameX ')*cos(' num2str(n*pi/b) '*' nameY ')'];
% magnetic field mode profile
func_Hx = [num2str(m/a) '*sin(' num2str(m*pi/a) '*' nameX ')*cos(' num2str(n*pi/b) '*' nameY ')'];
func_Hy = [num2str(n/b) '*cos(' num2str(m*pi/a) '*' nameX ')*sin(' num2str(n*pi/b) '*' nameY ')'];
func_E{dir+1} = 0;
func_E{dirP} = func_Ex;
func_E{dirPP} = func_Ey;
func_H{dir+1} = 0;
func_H{dirP} = func_Hx;
func_H{dirPP} = func_Hy;
[CSX,port] = AddWaveGuidePort( CSX, prio, portnr, start, stop, dir, func_E, func_H, kc, exc_amp, varargin{:} );
|
