reflectorCircular

Create circular reflector-backed antenna

Description

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.

Creation

Syntax

rc = reflectorCircular

rc = reflectorCircular(Name=Value)

Description

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.

Properties

Exciter — Antenna or array type used as exciter

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

Exciter antenna or array type, specified as a single-element antenna object, an array object, or an empty array. Except for reflector and cavity antenna elements, you can use any Antenna Toolbox™ antenna or array element as an exciter. To create the cavity backing structure without the exciter, specify this property as an empty array.

Example: horn

Example: linearArray(Element=patchMicrostrip)

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

"Air" (default) | dielectric object

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

Note

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

Example: dielectric("FR4")

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: double | logical

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: metal("Copper")

Load — Lumped elements

[1x1 lumpedElement] (default) | lumped element object

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

Examples

Circular Reflector Backed Antenna

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]

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

show(ant)

Version History

Introduced in R2017b