waveguideRidge

Create ridged waveguide antenna

Description

The default waveguideRidge object creates a dual ridged waveguide antenna resonating around 8 GHz. 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 with default property values. The default ridge waveguide is centered on the xy-plane. The default dimensions are chosen for an operating frequency range of around 8-10 GHz.

ant = waveguideRidge(Name=Value) sets properties using one or more name-value arguments. Name is the property name and Value is the corresponding value. You can specify several name-value arguments in any order as Name1=Value1,...,NameN=ValueN. Properties that you do not specify, retain their default values.

For example, ant = waveguideRidge(Height=1) creates a ridge waveguide with a height of 1 meter.

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: 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: 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: 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: 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: 0.0030

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: 0.0070

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: 0.00006

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: 0.0010

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: [-0.0725 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 an 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 in degrees, specified as a scalar or vector. For more information, see Rotate Antennas and Arrays.

Example: 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.

Data Types: double

TiltAxis — Tilt axis of antenna

[1 0 0] (default) | three-element vector | 2-by-3 matrix | "X" | "Y" | "Z"

Tilt axis of the antenna, specified as one of these values:

• 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, specified as a 2-by-3 matrix corresponding to two three-element vectors of Cartesian coordinates. In this case, the antenna rotates around the line joining the two points.

• "x", "y", or "z" to describe a rotation about the x-, y-, or z-axis, respectively.

For more information, see Rotate Antennas and Arrays.

Example: [0 1 0]

Example: [0 0 0;0 1 0]

Example: "Z"

Data Types: double | string

Object Functions

axialRatio	Calculate and plot axial ratio of antenna or array
bandwidth	Calculate and plot absolute bandwidth of antenna or array
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 or create AI-based antenna from antenna catalog objects
efficiency	Calculate and plot radiation efficiency of antenna or array
EHfields	Electric and magnetic fields of antennas or embedded electric and magnetic fields of antenna element in arrays
feedCurrent	Calculate current at feed for antenna or array
impedance	Calculate and plot input impedance of antenna or scan impedance of array
info	Display information about antenna, array, or platform
memoryEstimate	Estimate memory required to solve antenna or array mesh
mesh	Mesh properties of metal, dielectric antenna, or array structure
meshconfig	Change meshing mode of antenna, array, custom antenna, custom array, or custom geometry
msiwrite	Write antenna or array analysis data to MSI planet file
optimize	Optimize antenna or array using SADEA optimizer
pattern	Plot radiation pattern and phase of antenna or array or embedded pattern of antenna element in array
patternAzimuth	Azimuth plane radiation pattern of antenna or array
patternElevation	Elevation plane radiation pattern of antenna or array
peakRadiation	Calculate and mark maximum radiation points of antenna or array on radiation pattern
rcs	Calculate and plot monostatic and bistatic radar cross section (RCS) of platform, antenna, or array
resonantFrequency	Calculate and plot resonant frequency of antenna
returnLoss	Calculate and plot return loss of antenna or scan return loss of array
show	Display antenna, array structures, shapes, or platform
sparameters	Calculate S-parameters for antenna or array
stlwrite	Write mesh information to STL file
vswr	Calculate and plot voltage standing wave ratio (VSWR) of antenna or array element

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