quadCustom

Create Yagi-Uda custom array antenna

Description

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

Creation

Syntax

ant = quadCustom

ant = quadCustom(Name,Value)

Description

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.

Properties

Exciter — Antenna type used as exciter

dipole (default) | antenna object

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

Director — Antenna type or antenna shape used as director elements

array of three dipole antennas (default) | cell array of one or more antenna objects

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.

DirectorSpacing — Spacing between director elements

0.0423 (default) | real-valued scalar | vector

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

Reflector — Antenna type used as reflector elements

dipole (default) | cell array of one or more antenna objects

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.

ReflectorSpacing — Spacing between reflector elements

0.0423 (default) | real-valued scalar | vector

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

BoomLength — Length of boom

0.1800 (default) | real-valued scalar

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

Example: 'BoomLength',0.234

Example: ant.BoomLength = 0.234

Data Types: double

BoomWidth — Width of boom

0.0020 (default) | real-valued scalar

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

Example: 'BoomWidth',0.00324

Example: ant.BoomWidth = 0.00324

Data Types: double

BoomOffset — Signed distance from center of antenna elements

[0 0.0050 0.0450] (default) | three-element vector

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

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: ant.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: ant.TiltAxis = 'Z'

Note

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

Data Types: double

Object Functions

show	Display antenna or array structure; display shape as filled patch
axialRatio	Axial ratio of antenna
beamwidth	Beamwidth of antenna
charge	Charge distribution on metal or dielectric antenna or array surface
current	Current distribution on metal or dielectric antenna or array surface
design	Design prototype antenna or arrays for resonance at 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 or 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
returnLoss	Return loss of antenna; scan return loss of array
sparameters	S-parameter object
vswr	Voltage standing wave ratio of antenna

Examples

Default Custom Yagi-Uda Array Antenna (quadCustom) and Radiation Pattern

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]
           Conductor: [1x1 metal]
                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)

Custom Yagi-Uda Array Antenna with Seven Directors

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
     Conductor: [1x1 metal]
          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
     Conductor: [1x1 metal]
          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]
           Conductor: [1x1 metal]
                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