hornScrimp

Create Scrimp horn antenna

Since R2021a

Description

The hornScrimp object creates a Scrimp horn antenna. Scrimp (short circular ring loaded horn with minimized cross-polarization) horn antenna is a short, axially corrugated horn antenna with a single slot. Using this antenna provides high aperture efficiency, low cross-polarization, and low voltage standing wave ratio (VSWR) over a broad frequency band. These antennas are used for navigation satellite feeder links in a medium earth orbit (MEO).

Creation

Syntax

ant = hornScrimp

ant = hornScrimp(Name,Value)

Description

ant = hornScrimp creates Scrimp horn antenna with dimensions for an operating frequency of 4 GHz.

ant = hornScrimp(Name,Value) sets Properties using one or more name-value pairs. For example, hornScrimp('ConeHeight',0.05) creates Scrimp horn antenna with the cone height of 0.05 meters.

Properties

Radius — Radius of circular waveguide

0.02920 (default) | positive scalar

Radius of the circular waveguide, specified as a positive scalar in meters.

Example: 'Radius',0.0760

Example: ant.Radius = 0.0760

Data Types: double

WaveguideHeight — Height of circular waveguide

0.0250 (default) | positive scalar

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

Example: 'WaveguideHeight',0.0340

Example: ant.WaveguideHeight = 0.0340

Data Types: double

FeedHeight — Height of feed

0.0175 (default) | positive scalar

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

Example: 'FeedHeight',0.0085

Example: ant.FeedHeight = 0.0085

Data Types: double

FeedWidth — Width of feed

0.0003 (default) | positive scalar

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

Example: 'FeedWidth',0.0200

Example: ant.FeedWidth = 0.0200

Data Types: double

FeedOffset — Signed distance along waveguide height

0.0200 (default) | real-valued scalar

Signed distance along the waveguide height, specified as a real-valued scalar in meters.

Example: 'FeedOffset',0.03627

Example: ant.FeedOffset = 0.03627

Data Types: double

ConeHeight — Height of cone

0.0362 (default) | positive scalar

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

Example: 'ConeHeight',0.0540

Example: ant.ConeHeight = 0.0540

Data Types: double

ConeRadius — Radius of cone

0.0408 (default) | positive scalar

Radius of the cone, specified as a positive scalar in meters.

Example: 'ConeRadius',0.0540

Example: ant.ConeRadius = 0.0540

Data Types: double

ApertureRadius — Radius of cone aperture

0.0480 (default) | positive scalar

Radius of the cone aperture, specified as a positive scalar in meters.

Example: 'ApertureRadius',0.0760

Example: ant.ApertureRadius = 0.0760

Data Types: double

ApertureHeight — Height of cone aperture

0.0250 (default) | positive scalar

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

Example: 'ApertureHeight',0.0760

Example: ant.ApertureHeight = 0.0760

Data Types: double

StubHeight — Height of stub

0.0146 (default) | positive scalar

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

Example: 'StubHeight',0.0760

Example: ant.StubHeight = 0.0760

Data Types: double

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: m = metal('Copper'); 'Conductor',m

Example: m = metal('Copper'); ant.Conductor = m

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: ant.TiltAxis = 'Z'

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: 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

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. For more information, see lumpedElement.

Example: 'Load',lumpedelement, where lumpedelement is the load added to the antenna feed.

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

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

Create Default Scrimp Horn Antenna and Plot Radiation Pattern

Create Scrimp horn antenna with default properties.

ant = hornScrimp

ant = 
  hornScrimp with properties:

             Radius: 0.0292
    WaveguideHeight: 0.0250
         FeedHeight: 0.0175
          FeedWidth: 3.0000e-04
         FeedOffset: 0.0200
         ConeHeight: 0.0362
         ConeRadius: 0.0408
     ApertureRadius: 0.0480
     ApertureHeight: 0.0250
         StubHeight: 0.0146
          Conductor: [1x1 metal]
               Tilt: 0
           TiltAxis: [1 0 0]
               Load: [1x1 lumpedElement]

View the antenna using the show function.

show(ant)

Plot the radiation pattern of the Scrimp horn antenna at a frequency of 4 GHz.

pattern(ant,4e9)

Plot S-Parameter of Scrimp Horn Antenna

Create Scrimp horn antenna with the aperture radius of 0.06 meters.

ant = hornScrimp;
ant.ApertureRadius = 0.06;

Visualize the antenna using the show function.

show(ant)

Plot the S-parameters over a frequency range of 3.6 GHz to 4.5 GHz.

s = sparameters(ant,linspace(3.6e9,4.5e9,51));
rfplot(s)

More About

Parametric Analysis Guidelines

To understand how the properties of the hornScrimp antenna object influence the antenna design, use these parametric analysis guidelines.

• To increase the operating frequency, decrease the FeedHeight of the hornScrimp antenna.

• To increase the gain, increase the ApertureRadius, ApertureHeight, and StubHeight of the hornScrimp antenna object.

References

[1] Muhammad, S. A., A. Rolland, S. H. Dahlan, R. Sauleau, and H. Legay. “Hexagonal-Shaped Broadband Compact Scrimp Horn Antenna for Operation in C-Band.” IEEE Antennas and Wireless Propagation Letters 11 (2012): 842–45.

[2] Muhammad, S., A. Rolland, S. H. Dahlan, R. Sauleau and H. Legay. “Comparison Between Scrimp Horns and Stacked Fabry-Perot Cavity Antennas with Small Apertures.” 2012 6th European Conference on Antennas and Propagation (EUCAP) (2012): 817–820.

Version History

Introduced in R2021a