reflectorCircular

Create circular reflector-backed antenna

Description

Use the default reflectorCircular object to create a circular reflector-backed antenna resonating around 882.6 MHz. By default, the exciter antenna is a dipole.

Creation

Syntax

rc = reflectorCircular

rc = reflectorCircular(PropertyName=Value)

Description

rc = reflectorCircular creates a circular reflector backed antenna with a dipole exciter. The default dimensions are chosen for an operating frequency of around 882.6 MHz.

rc = reflectorCircular(PropertyName=Value) sets properties using one or more name–value arguments. PropertyName is the property name and Value is the corresponding value. You can specify several name-value arguments in any order as PropertyName1=Value1,...,PropertyNameN=ValueN. Properties that you do not specify, retain their default values.

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

Properties

Exciter — Antenna or array type used as exciter

dipole (default) | antenna object | array object | custom antenna object | empty array

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: []

GroundPlaneRadius — Reflector radius

0.1000 (default) | scalar

Radius of reflector, specified as a scalar in meters.

Example: 0.2

Data Types: double

Spacing — Distance between exciter and reflector bottom

0.0750 (default) | scalar

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

Example: 7.5e-2

Data Types: double

Substrate — Type of dielectric material

dielectric("Air") (default) | dielectric object

Type of dielectric material used as a substrate, specified as a dielectric object. You can choose any dielectric material from the DielectricCatalog or specify a dielectric material of your choice. You can also specify multiple dielectric layers. When creating multiple dielectric layers, specify the name, thickness, loss tangent, and relative permittivity of each layer. The substrate dimensions must be equal to the ground plane dimensions. For more information on dielectric substrate meshing, see Meshing.

Example: dielectric("FR4")

Example: dielectric(Name={"FR4","Teflon"},Thickness=[0.5 0.5],LossTangent=[0.002 0.002],EpsilonR=[4.8 2.1])

EnableProbeFeed — Create probe feed from backing structure to exciter

0 (default) | 1

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: logical

Conductor — Type of metal

metal("PEC") (default) | metal object

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

Example: metal("Copper")

Load — Lumped elements

[1x1 lumpedElement] (default) | lumpedElement object

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

Example: 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	Create antenna, array, or AI-based antenna resonating at specified frequency
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	Generate and view mesh for antennas, arrays, and custom shapes
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 and array catalog elements using SADEA or TR-SADEA algorithm
pattern	Plot radiation pattern of antenna, array, or embedded element of 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

Circular Reflector Backed Antenna

Create and view a default circular reflector backed antenna.

rc = reflectorCircular

rc = 
  reflectorCircular with properties:

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

show(rc)

Radiation Pattern of Circular Reflector Backed Antenna

Create an equiangular spiral backed by a circular reflector.

ant = reflectorCircular(Exciter=spiralEquiangular,GroundPlaneRadius=0.02,...
          Spacing=0.01);
show(ant)

Plot the radiation pattern of the antenna at 4 GHz.

pattern(ant,4e9)

Create Circular Reflector-Backed Linear Array of Dipole Antennas

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

show(ant)

Create Circular Array of Cylindrical Dielectric Resonator Antennas (DRAs) with Circular Backing Structure

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

show(ant)

Version History

Introduced in R2017b