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hornCorrugated

Create rectangular corrugated-horn antenna

Description

The hornCorrugated object creates a rectangular corrugated-horn antenna with grooves on the inner walls of the flare. These antennas provide spillover reduction and have beam symmetry and a low sidelobe level, so they are widely used as a feed in reflector antennas in broadcasting communications.

Rectangular corrugated horn antenna geometry, default radiation pattern, and impedance plot.

Creation

Description

example

ant = hornCorrugated creates a rectangular corrugated-horn antenna for a resonant frequency around 15 GHz.

ant = hornCorrugated(Name,Value) sets Properties using one or more name-value pairs. For example, ant = hornCorrugated('FlareLength', 0.045) creates a rectangular corrugated-horn antenna with the flare length of the horn set to 45 mm.

Properties

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Flare length of the horn, specified as a positive scalar in meters.

Example: 'FlareLength',0.35

Data Types: double

Flare width of the horn, specified as a positive scalar in meters.

Example: 'FlareWidth',0.2

Data Types: double

Flare height of the horn, specified as a positive scalar in meters.

Example: 'FlareHeight',0.15

Data Types: double

Length of the rectangular waveguide, specified as a positive scalar in meters.

Example: 'Length',0.09

Data Types: double

Width of the rectangular waveguide, specified as a positive scalar in meters.

Example: 'Width',0.05

Data Types: double

Height of the rectangular waveguide, specified as a positive scalar in meters.

Example: 'Height',0.0200

Data Types: double

Height of the feed, specified as a positive scalar in meters.

Example: 'FeedHeight',0.0050

Data Types: double

Width of the feed, specified as a positive scalar in meters.

Example: 'FeedWidth',5e-05

Data Types: double

Signed distance of the feedpoint from the center of the ground plane, specified as a two-element vector in meters.

Example: 'FeedOffset',[–0.0070 0.01]

Data Types: double

Distance between two successive corrugations, specified as a positive scalar in meters.

Example: 'Pitch',0.0060

Example: ant.Pitch = 0.0090

Data Types: double

Distance of the first corrugation from the waveguide, specified as a positive scalar in meters.

Example: 'FirstCorrugatedDistance',0.0360

Example: ant.FirstCorrugatedDistance = 0.0190

Data Types: double

Corrugation width, specified as a positive scalar in meters.

Example: 'CorrugateWidth',0.0058

Example: ant.CorrugateWidth = 0.0019

Data Types: double

Corrugation depth, specified as a two-element vector in meters. The first element corresponds to the width along E-plane, and the second element corresponds to the width along the H-plane.

Example: 'CorrugateDepth',[0.006 0.0560]

Example: ant.CorrugateDepth = [0.0050 0.0790]

Data Types: double

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

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.

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'

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. For more information, see lumpedElement.

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

Example: ant.Load = lumpedElement('Impedance',75)

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
numCorrugationsToPitchCalculate pitch for specified corrugations
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 a default rectangular corrugated-horn antenna.

ant = hornCorrugated
ant = 
  hornCorrugated with properties:

               FlareLength: 0.0428
                FlareWidth: 0.0900
               FlareHeight: 0.0800
                    Length: 0.0229
                     Width: 0.0102
                    Height: 0.0075
                 FeedWidth: 8.0000e-05
                FeedHeight: 0.0037
                FeedOffset: [-0.0020 0]
    FirstCorrugateDistance: 0.0160
            CorrugateDepth: [0.0050 0.0100]
            CorrugateWidth: 0.0030
                     Pitch: 0.0060
                 Conductor: [1x1 metal]
                      Tilt: 0
                  TiltAxis: [1 0 0]
                      Load: [1x1 lumpedElement]

View the antenna using the show function.

show(ant)

Figure contains an axes object. The axes object with title hornCorrugated antenna element contains 3 objects of type patch, surface. These objects represent PEC, feed.

Plot the radiation pattern of the antenna at a frequency 15.28 GHz.

p = PatternPlotOptions('MagnitudeScale',[-15 10]);
pattern(ant,15.28e9,'patternOptions',p)

Figure contains an axes object and other objects of type uicontrol. The axes object contains 3 objects of type patch, surface.

References

[1] Encinar, J., and J. Rebollar. “A Hybrid Technique for Analyzing Corrugated and Noncorrugated Rectangular Horns.” IEEE Transactions on Antennas and Propagation, vol. 34, no. 8, Aug. 1986, pp. 961–68.

Introduced in R2020b