waveguideCircular

Create circular waveguide

Since R2019b

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

Syntax

ant = waveguideCircular

ant = waveguideCircular(Name,Value)

Description

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

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.

Properties

Height — Height of circular waveguide

0.0300 (default) | real-valued scalar

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 — Radius of circular waveguide

0.0120 (default) | real-valued scalar

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

FeedHeight — Height of feed

0.0075 (default) | real-valued scalar

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

FeedWidth — Width of feed

0.0040 (default) | real-valued scalar

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

FeedOffset — Vertical distance of feed along Y-axis

0.0100 (default) | real-valued scalar

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

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

Load — Lumped elements

[1x1 lumpedElement] (default) | lumped element object handle

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 — 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: Tilt=[90 90],TiltAxis=[0 1 0;0 1 1] tilts the antenna at 90 degrees about the two axes defined by the vectors.

Note

The wireStack antenna object only accepts the dot method to change its properties.

Data Types: double

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: TiltAxis = 'Z'

Data Types: double

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

Default Circular Waveguide and Radiation Pattern

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
     Conductor: [1x1 metal]
          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)

S-Parameters and Impedance of Custom Circular Waveguide

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

Version History

Introduced in R2019b