waveguideCircular

Create circular waveguide

Description

The default waveguideCircular object creates a circular waveguide resonating around 8.58 GHz. 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 default property values. The default dimensions are chosen for an operating frequency of around 8.58 GHz.

ant = waveguideCircular(Name=Value) sets properties using one or more name-value arguments. Name is the property name and Value is the corresponding value. You can specify several name-value arguments in any order as Name1=Value1,...,NameN=ValueN. Properties that you do not specify, retain their default values.

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: 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: 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: 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: 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: 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 in degrees, specified as a scalar or vector. For more information, see Rotate Antennas and Arrays.

Example: 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

TiltAxis — Tilt axis of antenna

[1 0 0] (default) | three-element vector | 2-by-3 matrix | "X" | "Y" | "Z"

Tilt axis of the antenna, specified as one of these values:

• 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, specified as a 2-by-3 matrix corresponding to two three-element vectors of Cartesian coordinates. In this case, the antenna rotates around the line joining the two points.

• "x", "y", or "z" to describe a rotation about the x-, y-, or z-axis, respectively.

For more information, see Rotate Antennas and Arrays.

Example: [0 1 0]

Example: [0 0 0;0 1 0]

Example: "Z"

Data Types: double | string

Object Functions

axialRatio	Calculate and plot axial ratio of antenna or array
bandwidth	Calculate and plot absolute bandwidth of antenna or array
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 or create AI-based antenna from antenna catalog objects
efficiency	Calculate and plot radiation efficiency of antenna or array
EHfields	Electric and magnetic fields of antennas or embedded electric and magnetic fields of antenna element in arrays
feedCurrent	Calculate current at feed for antenna or array
impedance	Calculate and plot input impedance of antenna or scan impedance of array
info	Display information about antenna, array, or platform
memoryEstimate	Estimate memory required to solve antenna or array mesh
mesh	Mesh properties of metal, dielectric antenna, or array structure
meshconfig	Change meshing mode of antenna, array, custom antenna, custom array, or custom geometry
msiwrite	Write antenna or array analysis data to MSI planet file
optimize	Optimize antenna or array using SADEA optimizer
pattern	Plot radiation pattern and phase of antenna or array or embedded pattern of antenna element in array
patternAzimuth	Azimuth plane radiation pattern of antenna or array
patternElevation	Elevation plane radiation pattern of antenna or array
peakRadiation	Calculate and mark maximum radiation points of antenna or array on radiation pattern
rcs	Calculate and plot monostatic and bistatic radar cross section (RCS) of platform, antenna, or array
resonantFrequency	Calculate and plot resonant frequency of antenna
returnLoss	Calculate and plot return loss of antenna or scan return loss of array
show	Display antenna, array structures, shapes, or platform
sparameters	Calculate S-parameters for antenna or array
stlwrite	Write mesh information to STL file
vswr	Calculate and plot voltage standing wave ratio (VSWR) of antenna or array element

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