AddCPWPort

AddCPWPort(CSX, prio, portnr, materialname, start, stop, gap_width, dir, evec, varargin)

Full definition:

[CSX,port] = AddCPWPort( CSX, prio, portnr, materialname, start, stop, gap_width, dir, evec, varargin )

  • CSX: CSX-object created by InitCSX()

  • prio: priority for excitation and probe boxes

  • portnr: (integer) number of the port

  • materialname: property for the CPW (created by AddMetal())

  • start: 3D start rowvector for port definition

  • stop: 3D end rowvector for port definition

  • gap_width: width of the CPW gap (left and right)

  • dir: direction of wave propagation (choices: 0, 1, 2 or ‘x’,’y’,’z’)

  • evec: excitation vector, which defines the direction of the e-field (must be the same as used in AddExcitation())

variable input:

  • varargin: optional additional excitations options, see also AddExcitation

  • ‘ExcitePort’ true/false to make the port an active feeding port (default is false)

  • ‘FeedShift’ shift to port from start by a given distance in drawing units. Default is 0. Only active if ‘ExcitePort’ is set!

  • ‘Feed_R’ Specify a lumped port resistance. Default is no lumped port resistance –> port has to end in an ABC.

  • ‘MeasPlaneShift’ Shift the measurement plane from start t a given distance in drawing units. Default is the middle of start/stop.

  • ‘PortNamePrefix’ a prefix to the port name

Important: The mesh has to be already set and defined by DefineRectGrid!

example:

CSX = AddMetal( CSX, 'metal' ); %create a PEC called 'metal'
start = [0       -width/2  0];
stop  = [length  +width/2  0];
[CSX,port] = AddCPWPort( CSX, 0, 1, 'metal', start, stop, gap_width, 'x', ...
                              [0 0 -1], 'ExcitePort', true, 'Feed_R', 50 )

Explanation:

  • this defines a stripline in x-direction (dir=’x’) –> the wave travels along the x-direction

  • with an e-field excitation in -z-direction (evec=[0 0 -1])

  • the excitation is active and placed at x=start(1) (‘ExcitePort’, true)

  • a 50 Ohm lumped port resistance is placed at x=start(1) (‘Feed_R’, 50)

  • the width-direction is determined by the cross product of the direction of propagtion (dir=’x’) and the excitation vector (evec=[0 0 -1]), in this case it is the y-direction

  • the stripline-metal is created in a xy-plane at a height at z=start(3) –> The upper and lower reference plane (ground) must be defined by the user

Thorsten Liebig thorsten.liebig@gmx.de (c) 2014

See also InitCSX DefineRectGrid AddMetal AddMaterial AddExcitation calcPort