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cavityCircular

Create circular cavity-backed antenna

Description

Use the circularCavity object to create a circular cavity-backed antenna. By default, the exciter used is a dipole. The dimensions are chosen for an operating frequency of 1 GHz.

Default view of a circular cavity-backed antenna explaining the various parameters.

Creation

Description

example

circularcavity = cavityCircular creates a circular cavity-backed antenna.

example

circularcavity = cavityCircular(Name,Value) sets properties using one or more name-value pairs. For example, circularcavity = cavityCircular('Radius',0.2) creates a circular cavity of radius 0.2 m. Enclose each property name in quotes.

Properties

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Antenna type used as an exciter, specified as any single-element antenna object. Except reflector and cavity antenna elements, you can use any of the antenna elements or array elements in the Antenna Toolbox™ as an exciter.

Example: 'Exciter',horn

Example: ant.Exciter = horn

Example: ant.Exciter = linearArray('patchMicrostrip')

Radius of cavity, specified as a scalar in meters.

Example: 'Radius',0.2

Example: circularcavity.Radius = 0.2

Data Types: double

Cavity height along z-axis, specified as a scalar in meters.

Example: 'Height',0.001

Example: circularcavity.Height = 0.001

Data Types: double

Distance between the exciter and the base of the cavity, specified a scalar in meters.

Example: 'Spacing',7.5e-2

Example: circularcavity.Spacing = 7.5e-2

Data Types: double

Type of dielectric material used as a substrate, specified as a object. For more information see, dielectric. For more information on dielectric substrate meshing, see Meshing.

Note

The substrate dimensions must be equal to the ground plane dimensions.

Example: d = dielectric('FR4'); 'Substrate',d

Example: d = dielectric('FR4'); circularcavity.Substrate = d

Create probe feed from backing structure to exciter, specified as 0 or 1 or a positive scalar. By default, probe feed is not enabled.

Example: 'EnableProbeFeed',1

Example: circularcavity.EnableProbeFeed = 1

Data Types: double | logical

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: circularcavity.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: ant.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: ant.TiltAxis = 'Z'

Note

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

Data Types: double

Object Functions

showDisplay antenna or array structure; display shape as filled patch
axialRatioAxial ratio of antenna
beamwidthBeamwidth of antenna
chargeCharge distribution on metal or dielectric antenna or array surface
currentCurrent distribution on metal or dielectric antenna or array surface
designDesign prototype antenna or arrays for resonance around specified frequency
efficiencyRadiation efficiency of antenna
EHfieldsElectric and magnetic fields of antennas; Embedded electric and magnetic fields of antenna element in arrays
impedanceInput impedance of antenna; scan impedance of array
meshMesh properties of metal or dielectric antenna or array structure
meshconfigChange mesh mode of antenna structure
optimizeOptimize antenna or array using SADEA optimizer
patternRadiation pattern and phase of antenna or array; Embedded pattern of antenna element in array
patternAzimuthAzimuth pattern of antenna or array
patternElevationElevation pattern of antenna or array
rcsCalculate and plot radar cross section (RCS) of platform, antenna, or array
returnLossReturn loss of antenna; scan return loss of array
sparametersCalculate S-parameter for antenna and antenna array objects
vswrVoltage standing wave ratio of antenna

Examples

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Create and view a default circular cavity-backed antenna.

a = cavityCircular
a = 
  cavityCircular with properties:

            Exciter: [1x1 dipole]
          Substrate: [1x1 dielectric]
             Radius: 0.1000
             Height: 0.0750
            Spacing: 0.0750
    EnableProbeFeed: 0
          Conductor: [1x1 metal]
               Tilt: 0
           TiltAxis: [1 0 0]
               Load: [1x1 lumpedElement]

show(a)

Figure contains an axes object. The axes object with title cavityCircular antenna element contains 5 objects of type patch, surface. These objects represent PEC, feed.

Create and view an equiangular spiral backed by a circular cavity. The cavity dimensions are:

Radius = 0.02 m

Height = 0.01 m

Spacing = 0.01 m

 ant = cavityCircular('Exciter',spiralEquiangular,'Radius',0.02,   ...
          'Height',0.01,'Spacing', 0.01);
 show(ant)     

Figure contains an axes object. The axes object with title cavityCircular antenna element contains 5 objects of type patch, surface. These objects represent PEC, feed.

Create a linear array of H-shaped patch microstrip antenna.

arr = linearArray('Element',patchMicrostripHnotch,'ElementSpacing',0.04);

Create a circular cavity-backed antenna with linear array exciter.

ant = cavityCircular('Exciter',arr)
ant = 
  cavityCircular with properties:

            Exciter: [1x1 linearArray]
          Substrate: [1x1 dielectric]
             Radius: 0.1000
             Height: 0.0750
            Spacing: 0.0750
    EnableProbeFeed: 0
          Conductor: [1x1 metal]
               Tilt: 0
           TiltAxis: [1 0 0]
               Load: [1x1 lumpedElement]

show(ant)

Figure contains an axes object. The axes object with title cavityCircular antenna element contains 10 objects of type patch, surface. These objects represent PEC, feed.

Create and visualize a circular cavity-backed cylindrical dielectric resonator antenna.

e = draCylindrical;
ant = cavityCircular('Exciter',e)
ant = 
  cavityCircular with properties:

            Exciter: [1x1 draCylindrical]
          Substrate: [1x1 dielectric]
             Radius: 0.1000
             Height: 0.0750
            Spacing: 0.0750
    EnableProbeFeed: 0
          Conductor: [1x1 metal]
               Tilt: 0
           TiltAxis: [1 0 0]
               Load: [1x1 lumpedElement]

show(ant)

Figure contains an axes object. The axes object with title cavityCircular antenna element contains 8 objects of type patch, surface. These objects represent PEC, feed, customdielectric.

Introduced in R2017b