quadCustom

Create Yagi-Uda custom array antenna

Since R2019b

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

Lumped elements added to the antenna feed, specified as a lumped element object. 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 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/or plot axial ratio of antenna or array
bandwidth	Calculate and/or plot absolute bandwidth 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 or create AI-based antenna from antenna catalog objects
efficiency	Radiation efficiency of antenna
EHfields	Electric and magnetic fields of antennas or embedded electric and magnetic fields of antenna element in arrays
impedance	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
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
rcs	Calculate and plot monostatic and bistatic radar cross section (RCS) of platform, antenna, or array
resonantFrequency	Calculate and/or plot resonant frequency of antenna
returnLoss	Return loss of antenna or scan return loss of array
show	Display antenna, array structures, shapes, or platform
sparameters	Calculate S-parameters for antennas and antenna arrays
vswr	Voltage standing wave ratio (VSWR) of antenna or array element

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: {[1x1 dipole]  [1x1 dipole]  [1x1 dipole]  [1x1 dipole]  [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(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

Version History

Introduced in R2019b