reflectorParabolic

Create parabolic reflector antenna

Description

The reflectorParabolic object creates a parabolic reflector antenna. Parabolic reflector antennas are electrically large structures and are at least 10 wavelengths in diameter. These reflectors are used in TV antennas and satellite communications, for example.

Creation

Description

example

ant = reflectorParabolic creates a dipole-fed parabolic reflector antenna. The default antenna exciter operates at 10 GHz. The reflector is 10λ in diameter, where λ corresponds to the value of wavelength.

ant = reflectorParabolic(Name,Value) sets properties using one or more name-value pairs. For example, ant = reflectorParabolic('FocalLength',0.5) creates a parabolic reflector antenna of focal length 0.5 meters.

Output Arguments

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Parabolic reflector antenna, returned as a reflectorParabolic object.

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 single elements in the Antenna Toolbox™ as an exciter.

Example: 'Exciter',horn

Example: ant.Exciter = horn

Radius of the parabolic reflector, specified as a positive scalar integer in meters.

Example: 'Radius',0.22

Example: ant.Radius = 0.22

Data Types: double

Focal length of the parabolic dish, specified as a positive scalar integer in meters.

Example: 'FocalLength',0.0850

Example: ant.FocalLength = 0.0850

Data Types: double

Signed distance from the focus of the parabolic dish, specified as a three-element vector in meters. By default, the antenna exciter is at the focus of the parabola. Using the FeedOffset property, you can place the exciter anywhere on the parabola.

Example: 'FeedOffset',[0.0850 0 0]

Example: ant.FeedOffset = [0.0850 0 0]

Data Types: double

Lumped elements added to the antenna feed, specified as a lumped element object handle. For more information, see lumpedElement.

Example: 'Load',lumpedelement. lumpedelement is the object handle for the load created using lumpedElement.

Example: ant.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: 'Tilt',[90 90],'TiltAxis',[0 1 0;0 1 1] tilts the antenna at 90 degree about two axes, defined by vectors.

Data Types: double

Tilt axis of the antenna, specified as:

  • Three-element vectors of Cartesian coordinates in meters. In this case, each 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'

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 at specified frequency
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
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
returnLossReturn loss of antenna; scan return loss of array
sparametersS-parameter object
vswrVoltage standing wave ratio of antenna

Examples

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Create and view a default parabolic reflector antenna.

ant = reflectorParabolic
ant = 
  reflectorParabolic with properties:

        Exciter: [1x1 dipole]
         Radius: 0.1500
    FocalLength: 0.0750
     FeedOffset: [0 0 0]
           Tilt: 0
       TiltAxis: [1 0 0]
           Load: [1x1 lumpedElement]

show(ant)

Plot the radiation pattern of the parabolic reflector at 10 GHz.

pattern(ant,10e9)

Introduced in R2018b