quadCustom

Create Yagi-Uda custom array antenna

Description

The quadCustom object creates a Yagi-Uda custom array along the Z-axis.

Creation

Description

example

ant = quadCustom creates a half-wavelength Yagi-Uda custom array antenna along the Z-axis. The default antenna is excited using a dipole and consists of three directors and one reflector. The default dimensions are chosen for an operating frequency of 2.4 GHz.

ant = quadCustom(Name,Value) sets properties using one or more name-value pairs. For example, ant = quadCustom('Exciter',dipoleFolded) creates a Yagi-Uda custom array antenna with a folded dipole antenna as the exciter.

Output Arguments

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Yagi-Uda custom array antenna, returned as a quadCustom object.

Properties

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Antenna type used as an exciter, specified as a dipoleFolded, biquad, dipole, or loopCircular antenna object. This quadCustom supports a single exciter.

Example: 'Exciter',dipoleFolded

Example: ant.Exciter = dipoleFolded

Antenna type or antenna shape used as director elements, specified as a cell array consisting of one or more of the following antennas: dipole, dipoleVee, biquad, loopRectangular, loopCircular, antenna.Polygon, antenna.Circle, or antenna.Rectangle. You can use single or multiple antenna elements as directors.

Example: d = dipoleVee; ant = quadCustom('Director',{d d d d}). Yagi-Uda custom array antenna uses V-dipole as its directors.

Example: d = dipoleVee; ant = quadCustom; ant.Director= {d d d d} . Yagi-Uda custom array antenna uses V-dipole as its directors.

Spacing between the director elements, specified as a real-valued scalar in meters or a vector with each element unit in meters. You can specify a scalar value for equal spacing between the elements and vector value for unequal spacing between the elements. If you use a vector, the first value is the distance between the exciter and the first director element.

Example: 'DirectorSpacing',[0.234 0.324]

Example: ant.DirectorSpacing = [0.234 0.324]

Data Types: double

Antenna type used as reflector elements, specified as a cell array. You can use single or multiple antenna elements as reflectors.

Example: d = dipoleVee;ant = quadCustom('Reflector',{d d d d}) Yagi-Uda custom array antenna uses V- dipole as its reflectors.

Example: d = dipoleVee;ant = quadCustom;ant.Reflector={d d d d} Yagi-Uda custom array antenna uses V- dipole as its reflectors.

Spacing between the reflector elements, specified as a real-valued scalar in meters or a vector with each element unit in meters. You can specify a scalar value for equal spacing between the elements or a vector value for unequal spacing between the elements. If you use a vector, the first value is the distance between the exciter and the first reflector element.

Example: 'ReflectorSpacing',[0.234 0.324]

Example: ant.ReflectorSpacing = [0.234 0.324]

Data Types: double

Length of the boom, specified as a real-valued scalar in meters.

Example: 'BoomLength',0.234

Example: ant.BoomLength = 0.234

Data Types: double

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

Example: 'BoomWidth',0.00324

Example: ant.BoomWidth = 0.00324

Data Types: double

Signed distance from center of antenna elements, specified as a three-element vector with each element unit in meters.

Example: 'BoomOffset',[0 0.0060 0.0350]

Example: ant.BoomOffset = [0 0.0060 0.0350]

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 custom Yagi-Uda array antenna.

ant = quadCustom
ant = 
  quadCustom with properties:

             Exciter: [1x1 dipole]
            Director: {[1x1 dipole]  [1x1 dipole]  [1x1 dipole]}
     DirectorSpacing: 0.0423
           Reflector: {[1x1 dipole]}
    ReflectorSpacing: 0.0308
          BoomLength: 0.1800
           BoomWidth: 0.0020
          BoomOffset: [0 0.0050 0.0450]
                Tilt: 0
            TiltAxis: [1 0 0]
                Load: [1x1 lumpedElement]

show(ant)

Plot the radiation pattern of the antenna at 2.4 GHz.

pattern(ant,2.4e9)

Create the default quadCustom, change the number of directors to seven, and view the structure.

 ant = design(dipole,2.4e9);
 ant.Tilt = 90
ant = 
  dipole with properties:

        Length: 0.0587
         Width: 0.0012
    FeedOffset: 0
          Tilt: 90
      TiltAxis: [1 0 0]
          Load: [1x1 lumpedElement]

 ant.TiltAxis = [0 1 0]
ant = 
  dipole with properties:

        Length: 0.0587
         Width: 0.0012
    FeedOffset: 0
          Tilt: 90
      TiltAxis: [0 1 0]
          Load: [1x1 lumpedElement]

 quad_ant = quadCustom('Director',{ant,ant,ant,ant,ant,ant,ant})
quad_ant = 
  quadCustom with properties:

             Exciter: [1x1 dipole]
            Director: {1x7 cell}
     DirectorSpacing: 0.0423
           Reflector: {[1x1 dipole]}
    ReflectorSpacing: 0.0308
          BoomLength: 0.1800
           BoomWidth: 0.0020
          BoomOffset: [0 0.0050 0.0450]
                Tilt: 0
            TiltAxis: [1 0 0]
                Load: [1x1 lumpedElement]

 show(quad_ant)

Plot the radiation pattern of the antenna at the frequency 2.4 GHz.

pattern(quad_ant,2.4e9)

References

[1] Bankey, Vinay, and N.Anvesh Kumar. "Design of a Yagi-Uda Antenna with Gain and Bandwidth Enhancement for Wi-Fi and Wi-Max Applications." International Journal of Antennas. Vol.2, Number 1, 2017

Introduced in R2019b