# waveguide

Create rectangular waveguide

## 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.

## Creation

### 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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Height of feed, specified as a scalar in meters. By default, the feed height is chosen for an operating frequency of 12.5 GHz.

Example: 'FeedHeight',0.0050

Data Types: double

Width of feed, specified as a scalar in meters.

Example: 'FeedWidth',5e-05

Data Types: double

Rectangular waveguide length, specified as a scalar in meters. By default, the waveguide length is 1λ, where:

$\lambda =c/f$

• c = speed of light, 299792458 m/s

• f = operating frequency of the waveguide

Example: 'Length',0.09

Data Types: double

Rectangular waveguide width, specified as a scalar in meters.

Example: 'Width',0.05

Data Types: double

Rectangular waveguide height, specified as a scalar in meters.

Example: 'Height',0.0200

Data Types: double

Signed distance of feedpoint from center of ground plane, specified as a two-element vector in meters. By default, the feed is at an offset of λ/4 from the shortened end on the xy- plane.

Example: 'FeedOffset',[–0.0070 0.01]

Data Types: double

Type of the metal used as a conductor, specified as a metal material object. You can choose any metal from the MetalCatalog or specify a metal of your choice. For more information, see metal. For more information on metal conductor meshing, see Meshing.

Example: m = metal('Copper'); 'Conductor',m

Example: m = metal('Copper'); ant.Conductor = m

Lumped elements added to the antenna feed, specified as a lumped element object. For more information, see lumpedElement.

Example: 'Load',lumpedelement. lumpedelement is the object for the load created using lumpedElement.

Example: wg.Load = lumpedElement('Impedance',75)

Tilt angle of the antenna, specified as a scalar or vector with each element unit in degrees. For more information, see Rotate Antennas and Arrays.

Example: Tilt=90

Example: Tilt=[90 90],TiltAxis=[0 1 0;0 1 1] tilts the antenna at 90 degrees about the two axes defined by the vectors.

Note

The wireStack antenna object only accepts the dot method to change its properties.

Data Types: double

Tilt axis of the antenna, specified as:

• Three-element vector of Cartesian coordinates in meters. In this case, each coordinate in the vector starts at the origin and lies along the specified points on the X-, Y-, and Z-axes.

• Two points in space, each specified as three-element vectors of Cartesian coordinates. In this case, the antenna rotates around the line joining the two points in space.

• A string input describing simple rotations around one of the principal axes, 'X', 'Y', or 'Z'.

For more information, see Rotate Antennas and Arrays.

Example: TiltAxis=[0 1 0]

Example: TiltAxis=[0 0 0;0 1 0]

Example: TiltAxis = 'Z'

Note

The wireStack antenna object only accepts the dot method to change its properties.

Data Types: double

## Object Functions

 show Display antenna, array structures or shapes info Display information about antenna or array axialRatio Axial ratio of antenna beamwidth Beamwidth of antenna charge Charge distribution on antenna or array surface current Current distribution on antenna or array surface design Design prototype antenna or arrays for resonance around specified frequency efficiency Radiation efficiency of antenna 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, dielectric antenna, or array structure meshconfig Change mesh mode of antenna structure optimize Optimize antenna or array using SADEA optimizer pattern Radiation pattern and phase 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 rcs Calculate and plot radar cross section (RCS) of platform, antenna, or array returnLoss Return loss of antenna; scan return loss of array sparameters Calculate S-parameter for antenna and antenna array objects vswr Voltage standing wave ratio of antenna

## Examples

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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]
Conductor: [1x1 metal]
Tilt: 0
TiltAxis: [1 0 0]

show(wg)

Create a WR-650 rectangular waveguide and display it.

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

Plot the radiation pattern of this waveguide at 1.5 GHz.

figure
pattern(wg,1.5e9)

## References

[1] Balanis, Constantine A.Antenna Theory. Analysis and Design. 3rd Ed. New York: John Wiley and Sons, 2005.

## Version History

Introduced in R2016a