waveguideCircular

Create circular waveguide

Description

The waveguideCircular object creates a circular waveguide. A circular waveguide is a hollow tube of uniform cross section, that confines the electromagnetic wave. This antenna is used in radar and short and medium distance broadband communication.

Creation

Description

example

ant = waveguideCircular creates a circular waveguide with dimensions for an operating frequency of 8.42 GHz.

example

ant = waveguideCircular(Name,Value) sets properties using one or more name-value pairs. For example, ant = waveguideCircular('Height',1) creates a circular waveguide with a height of 1 meter.

Output Arguments

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Circular waveguide, returned as a waveguideCircular object.

Properties

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

Example: 'Height',0.0215

Example: ant.Height = 0.0215

Data Types: double

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

Example: 'Radius',0.0546

Example: ant.Radius = 0.0546

Data Types: double

Height of the feed, which is equal to the height of the monopole, specified as a real-valued scalar in meters.

Example: 'FeedHeight',0.0034

Example: ant.FeedHeight = 0.0034

Data Types: double

Width of the feed, which is equal to the width of the monopole, specified as a real-valued scalar in meters.

Example: 'FeedWidth',0.0050

Example: ant.FeedWidth = 0.0050

Data Types: double

Vertical distance of the feed along the Y-axis, specified as a real-valued scalar in meters.

Example: 'FeedOffset',0.0050

Example: ant.FeedOffset = 0.0050

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 circular waveguide.

ant = waveguideCircular
ant = 
  waveguideCircular with properties:

        Radius: 0.0120
        Height: 0.0300
    FeedHeight: 0.0075
     FeedWidth: 0.0040
    FeedOffset: 0.0100
          Tilt: 0
      TiltAxis: [1 0 0]
          Load: [1x1 lumpedElement]

show(ant)

Plot the radiation pattern of the antenna at 7.42 GHz.

pattern(ant,7.42e9)

Create a circular waveguide with the following dimensions.

ant=waveguideCircular('Radius',35.7e-3,'Height',200e-3,...
       'Feedwidth',26e-3,'FeedHeight',34.71e-3,'FeedOffset', 42.42e-3);
show(ant);

Plot the s-parameters and impedance of the waveguide.

s=sparameters(ant,linspace(2.5e9,4e9,45));
rfplot(s);

figure;
impedance(ant,linspace(2.5e9,4e9,45));

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