Question

I have the dimensions of a rectangular waveguide and I have the value of operating frequency
I want to simulate this waveguide using MATLAB and see the effect of changing parameters like the operating frequency, the intrinsic impedance and wave length using MATLAB also

Answer 1

Create it like this in matlab

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waveguide

Create rectangular waveguide

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Description

The waveguide object is an open-ended rectangular waveguide. The default rectangular waveguide is the WR-90 and functions in the X-band. The X-band has a cutoff frequency of 6.5 GHz and ranges from 8.2 GHz to 12.5 GHz.

Length w =width h = Height h1 FeedHeight 1 -FeedWidth f = FeedOffet

Creation

Syntax

wg = waveguide

wg = waveguide(Name,Value)

Description

example

wg = waveguide creates an open-ended rectangular waveguide.

example

wg = waveguide(Name,Value) creates a rectangular waveguide with additional properties specified by one, or more name-value pair arguments. Name is the property name and Value is the corresponding value. You can specify several name-value pair arguments in any order as Name1,Value1,...,NameN,ValueN. Properties not specified retain their default values.

Properties

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FeedHeight — Height of feed
0.0060 (default) | scalar

FeedWidth — Width of feed
6.0000e-05 (default) | scalar

Length — Rectangular waveguide length
0.0240 (default) | scalar in meters

Width — Rectangular waveguide width
0.0229 (default) | scalar in meters

Height — Rectangular waveguide height
0.0102 (default) | scalar

FeedOffset — Signed distance of feedpoint from center of ground plane
[–0.0060 0] (default) | two-element vector

Load — Lumped elements
[1x1 lumpedElement] (default) | lumped element object handle

Tilt — Tilt angle of antenna
0 (default) | scalar | vector

TiltAxis — Tilt axis of antenna
[1 0 0] (default) | three-element vectors of Cartesian coordinates | two three-element vector of Cartesian coordinates | 'X' | 'Y' | 'Z'

Object Functions

show	Display antenna or array structure; Display shape as filled patch
info	Display information about antenna or array
axialRatio	Axial ratio of antenna
beamwidth	Beamwidth of antenna
charge	Charge distribution on metal or dielectric antenna or array surface
current	Current distribution on metal or dielectric antenna or array surface
design	Design prototype antenna or arrays for resonance at specified frequency
EHfields	Electric and magnetic fields of antennas; Embedded electric and magnetic fields of antenna element in arrays
impedance	Input impedance of antenna; scan impedance of array
mesh	Mesh properties of metal or dielectric antenna or array structure
meshconfig	Change mesh mode of antenna structure
pattern	Radiation pattern of antenna or array; Embedded pattern of antenna element in array
patternAzimuth	Azimuth pattern of antenna or array
patternElevation	Elevation pattern of antenna or array
returnLoss	Return loss of antenna; scan return loss of array
sparameters	S-parameter object
vswr	Voltage standing wave ratio of antenna

Examples

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Default Rectangular Waveguide

Try it in MATLAB

Create a rectangular waveguide using default dimensions. Display the waveguide.

wg = waveguide

wg = 
  waveguide with properties:

        Length: 0.0240
         Width: 0.0229
        Height: 0.0102
     FeedWidth: 6.0000e-05
    FeedHeight: 0.0060
    FeedOffset: [-0.0060 0]
          Tilt: 0
      TiltAxis: [1 0 0]
          Load: [1x1 lumpedElement]

show(wg)

or

wg = waveguide('Length',0.254,'Width',0.1651,'Height',0.0855,...
    'FeedHeight',0.0635,'FeedWidth',0.00508,'FeedOffset',[0.0635 0]);
show(wg)

Syntax

wg = waveguide

wg = waveguide(Name,Value)

Description

example

wg = waveguide creates an open-ended rectangular waveguide.

example

wg = waveguide(Name,Value) creates a rectangular waveguide with additional properties specified by one, or more name-value pair arguments. Name is the property name and Value is the corresponding value. You can specify several name-value pair arguments in any order as Name1,Value1,...,NameN,ValueN. Properties not specified retain their default values.