waveguideRidge

Create ridged waveguide antenna

Since R2019b

Description

The waveguideRidge object creates a dual ridged waveguide antenna. The ridges ensure a smooth transition from an input impedance of 50 ohms to the impedance of free space (377 ohms). The dual ridged waveguide antenna widely used in ultra-wideband applications covering a large spectrum of frequencies. Ridged waveguide antennas are used in radio astronomy applications.

Creation

Syntax

ant = waveguideRidge

ant = waveguideRidge(Name,Value)

Description

ant = waveguideRidge creates a double-ridged waveguide antenna. The default waveguideRidge antenna object is centered on the xy-plane. The object dimensions are chosen for an operating frequency of 8-10 GHz.

ant = waveguideRidge(Name,Value) sets properties using one or more name-value pairs. For example, ant = waveguideRidge('Height',1) creates a ridge waveguide with a height of 1 meter.

Note

Properties you do not specify retain their default values.

Properties

Length — Length of waveguide

0.0210 (default) | positive real-valued scalar

Length of the waveguide, specified as a real-valued scalar in meters.

Example: 'Length',0.0410

Example: ant.Length = 0.0410

Data Types: double

Width — Width of waveguide

0.0400 (default) | positive real-valued scalar

Width of the waveguide, specified as a real-valued scalar in meters.

Example: 'Width',0.0640

Example: ant.Width = 0.0640

Data Types: double

Height — Height of waveguide

0.0250 (default) | positive real-valued scalar

Height of the waveguide, specified as a real-valued scalar in meters.

Example: 'Height',0.0340

Example: ant.Height = 0.0340

Data Types: double

RidgeLength — Length of Ridge

0.01875 (default) | positive real-valued scalar

Length of the ridge, specified as a real-valued scalar in meters.

Example: 'RidgeLength',0.0220

Example: ant.RidgeLength = 0.0220

Data Types: double

RidgeWidth — Width of Ridge

0.0025 (default) | positive real-valued scalar

Width of the ridge, specified as a real-valued scalar in meters.

Example: 'RidgeWidth',0.0030

Example: ant.RidgeLength = 0.0060

Data Types: double

RidgeGap — Gap between two ridges

0.0088 (default) | real-valued scalar

Gap between two ridges, specified as a real-valued scalar in meters.

Example: 'RidgeGap',0.0070

Example: ant.RidgeGap = 0.0098

Data Types: double

FeedHoleRadius — Radius of feeding hole

0.00005 (default) | real-valued scalar

Radius of the feeding hole, specified as a real-valued scalar in meters.

Example: 'FeedHoleRadius',0.00006

Example: ant.FeedHoleRadius = 0.00010

Data Types: double

FeedWidth — Width of feed

0.0001 (default) | positive real-valued scalar

Width of the feed, specified as a real-valued scalar in meters.

Example: 'FeedWidth',0.0010

Example: ant.FeedWidth = 0.0020

Data Types: double

FeedOffset — Signed distances from origin

[-0.0675 0] (default) | two-element vector

Signed distances from the origin measured along the length and width of the waveguide, specified as a two-element vector with each element in meters.

Example: 'FeedOffset',[-0.0725 0]

Example: ant.FeedOffset = [-0.0830 0]

Data Types: double

Conductor — Type of metal material

'PEC' (default) | metal object

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

Load — Lumped elements

[1x1 lumpedElement] (default) | lumpedelement object

Lumped elements added to the antenna feed, specified as lumpedelement object. You can add a load anywhere on the surface of the antenna. By default, the load is at the feed. For more information, see lumpedElement.

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

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

Tilt — Tilt angle of antenna

0 (default) | scalar | vector

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

TiltAxis — Tilt axis of antenna

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

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'

Data Types: double

Object Functions

show	Display antenna, array structures or shapes
impedance	Input impedance of antenna; scan impedance of array
sparameters	Calculate S-parameter for antenna and antenna array objects
rcs	Calculate and plot radar cross section (RCS) of platform, antenna, or array
returnLoss	Return loss of antenna; scan return loss of array
vswr	Voltage standing wave ratio of antenna
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
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
mesh	Mesh properties of metal, dielectric antenna, or array structure

Examples

Create a Ridged Waveguide Antenna with Default Properties

Create a waveguideRidge antenna object with default properties.

a = waveguideRidge

a = 
  waveguideRidge with properties:

            Length: 0.0210
             Width: 0.0400
            Height: 0.0250
       RidgeLength: 0.0187
        RidgeWidth: 0.0025
          RidgeGap: 0.0088
    FeedHoleRadius: 5.0000e-04
         FeedWidth: 1.0000e-04
        FeedOffset: [-0.0067 0]
         Conductor: [1x1 metal]
              Tilt: 0
          TiltAxis: [1 0 0]
              Load: [1x1 lumpedElement]

Create a Ridged Waveguide Antenna with Specified Properties

Create a waveguideRidge antenna object with the properties specified.

h = waveguideRidge('Length',0.0273,'Width', 0.02286,'RidgeGap',2e-3, ...
          'Height', 0.01016,'RidgeLength',0.022);

View the waveguideRidge antenna using a show function.

figure    
show(h)  

Plot the 3-D radiation pattern of the waveguideRidge antenna at 5 GHz.

pattern(h,5e9)

Version History

Introduced in R2019b