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Create circular reflector-backed antenna


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




rc = reflectorCircular creates a circular reflector backed antenna.


rc = reflectorCircular(Name=Value) creates a circular reflector antenna, with additional Properties specified by 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 not specified retain their default values.

For example, rc = reflectorCircular(Radius=0.2) creates a circular reflector of radius 0.2 m.


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Exciter antenna or array type, specified as either:

  • Antenna object from the catalog (except reflector type, cavity type and platform-installed antennas)

  • Array object from the catalog (except conformal and infinite arrays)

  • Custom antennas: customAntennaGeometry, customAntennaMesh, customAntenna

  • Empty array

To create the reflector backing structure without an exciter, specify this property as an empty array.

Example: horn

Example: linearArray(Element=patchMicrostrip)

Example: customAntenna

Example: []

Radius of reflector, specified as a scalar in meters.

Example: 0.2

Data Types: double

Distance between the exciter and the reflector, specified as a scalar in meters.

Example: 7.5e-2

Data Types: double

Substrate dielectric material, specified as "air" or a dielectric object. For more information see, dielectric. For more information about dielectric substrate meshing, see Meshing.


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

Example: dielectric("FR4")

Create probe feed from backing structure to exciter, specified as 0 (disable) or 1 (enable). By default, probe feed is disabled.

Example: 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: metal("Copper")

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

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

Example: lumpedElement(Impedance=75)

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

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

axialRatioCalculate and/or plot axial ratio of antenna or array
bandwidthCalculate and/or plot absolute bandwidth of antenna
beamwidthBeamwidth of antenna
chargeCharge distribution on antenna or array surface
currentCurrent distribution on antenna or array surface
designDesign prototype antenna or arrays for resonance around specified frequency or create AI-based antenna from antenna catalog objects
efficiencyRadiation efficiency of antenna
EHfieldsElectric and magnetic fields of antennas or embedded electric and magnetic fields of antenna element in arrays
impedanceInput impedance of antenna or scan impedance of array
infoDisplay information about antenna, array, or platform
memoryEstimateEstimate memory required to solve antenna or array mesh
meshMesh properties of metal, dielectric antenna, or array structure
meshconfigChange meshing mode of antenna, array, custom antenna, custom array, or custom geometry
optimizeOptimize antenna or array using SADEA optimizer
patternPlot radiation pattern and phase of antenna or array or embedded pattern of antenna element in array
patternAzimuthAzimuth plane radiation pattern of antenna or array
patternElevationElevation plane radiation pattern of antenna or array
rcsCalculate and plot monostatic and bistatic radar cross section (RCS) of platform, antenna, or array
resonantFrequencyCalculate and/or plot resonant frequency of antenna
returnLossReturn loss of antenna or scan return loss of array
showDisplay antenna, array structures, shapes, or platform
sparametersCalculate S-parameters for antennas and antenna arrays
vswrVoltage standing wave ratio (VSWR) of antenna or array element


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Create and view a default circular reflector backed antenna.

rc = reflectorCircular
rc = 
  reflectorCircular with properties:

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


Create an equiangular spiral backed by a circular reflector.

ant = reflectorCircular(Exciter=spiralEquiangular,GroundPlaneRadius=0.02,...

Plot the radiation pattern of the antenna at 4 GHz.


Create a linear array of the dipole antennas.

d = dipole(Length=1);
la = linearArray(Element=d,NumElements=4,ElementSpacing=0.2,Tilt=90);

Create a linear array with circular reflector backing structure.

ant = reflectorCircular(Exciter=la,GroundPlaneRadius=2,Spacing=0.5)
ant = 
  reflectorCircular with properties:

              Exciter: [1x1 linearArray]
            Substrate: [1x1 dielectric]
    GroundPlaneRadius: 2
              Spacing: 0.5000
      EnableProbeFeed: 0
            Conductor: [1x1 metal]
                 Tilt: 0
             TiltAxis: [1 0 0]
                 Load: [1x1 lumpedElement]


Create a circular reflector-backed circular array of cylindrical DRAs.

ca = circularArray(Element=draCylindrical,Radius=0.05);
ant = reflectorCircular(Exciter=ca,GroundPlaneRadius=0.2)
ant = 
  reflectorCircular with properties:

              Exciter: [1x1 circularArray]
            Substrate: [1x1 dielectric]
    GroundPlaneRadius: 0.2000
              Spacing: 0.0750
      EnableProbeFeed: 0
            Conductor: [1x1 metal]
                 Tilt: 0
             TiltAxis: [1 0 0]
                 Load: [1x1 lumpedElement]


Version History

Introduced in R2017b