hornConical

Create conical horn antenna

Description

The hornConical object creates a waveguide shaped like a cone to direct radio waves in a beam. This type of horn is widely used as feed element for large radio astronomy telescopes, satellite tracking, and communication dishes.

Creation

Description

example

ant = hornConical creates a conical horn antenna with dimensions for an operating frequency of 7.58 GHz.

example

ant = hornConical(Name,Value) sets properties using one or more name-value pairs. For example, ant = hornConical('Radius',1) creates a conical horn antenna with a radius of 1 meter.

Output Arguments

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Conical horn antenna, returned as a hornConical object.

Properties

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Radius of the waveguide, specified as a real-valued scalar in meters.

Example: 'Radius',0.760

Example: ant.Radius = 0.760

Data Types: double

Height of the waveguide, specified as a real-valued scalar in meters.

Example: 'WaveguideHeight',0.0340

Example: ant.WaveguideHeight = 0.0340

Data Types: double

Height of the feed, specified as a real-valued scalar in meters.

Example: 'FeedHeight',0.0085

Example: ant.FeedHeight = 0.0085

Data Types: double

Width of the feed, specified as a real-valued scalar in meters.

Example: 'FeedWidth',0.0200

Example: ant.FeedWidth = 0.0200

Data Types: double

Signed distances along the Y-axis, specified as a real-valued scalar in meters.

Example: 'FeedOffset',0.03627

Example: ant.FeedOffset = 0.3627

Data Types: double

Height of the cone, specified as a real-valued scalar in meters.

Example: 'ConeHeight',0.0540

Example: ant.ConeHeight = 0.0540

Data Types: double

Radius of the cone aperture, specified as a real-valued scalar in meters.

Example: 'ApertureRadius',0.0760

Example: ant.ApertureRadius = 0.0760

Data Types: double

Lumped elements added to the antenna feed, specified as a lumped element object handle. 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 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 conical horn antenna.

ant = hornConical
ant = 
  hornConical with properties:

             Radius: 0.0120
    WaveguideHeight: 0.0300
         FeedHeight: 0.0075
          FeedWidth: 0.0030
         FeedOffset: 0.0100
         ConeHeight: 0.0348
     ApertureRadius: 0.0350
               Tilt: 0
           TiltAxis: [1 0 0]
               Load: [1x1 lumpedElement]

show(ant)

Plot the radiation pattern of the antenna at 7.58 GHz.

pattern(ant,7.58e9)

Create a conical horn antenna with the following dimensions.

ant=hornConical('Radius',35.71e-3,'WaveguideHeight',200e-3,...
       'Feedwidth',26e-3,'FeedHeight',34.71e-3,'FeedOffset',42.42e-3,...
       'ConeHeight',130e-3,'ApertureRadius',62.5e-3);
show(ant);

Plot the s-parameters and the impedance of the antenna.

s=sparameters(ant,2.5e9:20e6:4e9);
rfplot(s);

figure;
impedance(ant,2.5e9,20e6:4e9); 

References

[1] Jadhav, Rohini.P, Vinithkurnar Javnrakash Dongre, Arunkumar Heddallikar. "Design of X-Band Conical Horn Antenna Using Coaxial Feed and Improved Design Technique for Bandwidth Enhancement." In International Conference on Computing, Communication, Control, and Automation (ICCUBEA), 1-6. Pune, India: ICCUBEA 2017

Introduced in R2019b