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draRectangular

Create rectangular dielectric resonator antenna

Since R2021a

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    Description

    The default draRectangular object creates a rectangular dielectric resonator antenna resonating around 5 GHz. The rectangular dielectric resonator antenna consists of a rectangular-shaped dielectric placed on a ground plane. It has high power-handling capacity and can provide high gain and bandwidth. The rectangular dielectric resonator antenna has the advantage of two aspect ratio that aids in the generation of various modes. These antennas are more suitable for use at microwave frequencies. Rectangular dielectric resonator antennas are widely used in satellite and radar systems.

    Creation

    Syntax

    dr = draRectangular
    dr = draRectangular(Name=Value)

    Description

    dr = draRectangular creates a rectangular dielectric resonator antenna with default property values. The default dimensions are chosen for an operating frequency of around 5 GHz. The default antenna is probe fed with the feed point at the origin.

    example

    dr = draRectangular(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, dr = draRectangular(ResonatorLength=0.04) creates a rectangular dielectric resonator antenna with the length of the dielectric resonator set to 40 mm. and default values for other properties.

    example

    Properties

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    Length of the dielectric resonator, specified as a positive scalar in meters.

    Example: 0.35

    Data Types: double

    Width of the dielectric resonator, specified as a positive scalar in meters.

    Example: 0.30

    Data Types: double

    Type of dielectric material used as a substrate, specified as a dielectric object. The default dielectric material has a relative permittivity of 8.9 and a loss tangent of 0.002. You can choose any material from the DielectricCatalog or use your own dielectric material. For more information on dielectric substrate meshing, see Meshing.

    Note

    The substrate dimensions must be less than the ground plane dimensions.

    Example: dielectric("FR4")

    Ground plane length, specified as a positive scalar in meters. By default, ground plane length is measured along the x-axis. Set GroundPlaneLength to Inf to use the infinite ground plane technique for antenna analysis.

    Example: 120e-3

    Data Types: double

    Ground plane width, specified as a positive scalar in meters. By default, ground plane width is measured along y-axis. Setting GroundPlaneWidth to Inf to use the infinite ground plane technique for antenna analysis.

    Example: 118e-3

    Data Types: double

    Width of the feed, specified as a positive scalar in meters.

    Example: 5e-05

    Data Types: double

    Height of the feed, specified as a positive scalar in meters.

    Example: 0.0050

    Data Types: double

    Signed distance between feed point and the center of the ground plane, specified as a two-element vector in meters. The two elements represent the distances in x, and y directions from center of the ground plane respectively.

    Example: [–0.0070 0.01]

    Data Types: double

    Type of the metal used as a conductor, specified as a metal object. You can choose any metal from the MetalCatalog or specify a metal of your choice. For more information on metal conductor meshing, see Meshing.

    Example: metal("Copper")

    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

    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

    Lumped elements added to the antenna feed, specified as a lumpedElement object. You can add a load anywhere on the surface of the antenna. By default, the load is at the feed.

    Example: Load=lumpedElement(Impedance=75)

    Example: antenna.Load = lumpedElement(Impedance=75)

    Object Functions

    axialRatioCalculate and plot axial ratio of antenna or array
    bandwidthCalculate and plot absolute bandwidth of antenna or array
    beamwidthBeamwidth of antenna
    chargeCharge distribution on antenna or array surface
    currentCurrent distribution on antenna or array surface
    designDesign prototype antenna or arrays for resonance around specified frequency or create AI-based antenna from antenna catalog objects
    efficiencyCalculate and plot radiation efficiency of antenna or array
    EHfieldsElectric and magnetic fields of antennas or embedded electric and magnetic fields of antenna element in arrays
    feedCurrentCalculate current at feed for antenna or array
    impedanceCalculate and plot input impedance of antenna or scan impedance of array
    infoDisplay information about antenna, array, or platform
    memoryEstimateEstimate memory required to solve antenna or array mesh
    meshMesh properties of metal, dielectric antenna, or array structure
    meshconfigChange meshing mode of antenna, array, custom antenna, custom array, or custom geometry
    msiwriteWrite antenna or array analysis data to MSI planet file
    optimizeOptimize antenna or array using SADEA optimizer
    patternPlot radiation pattern and phase of antenna or array or embedded pattern of antenna element in array
    patternAzimuthAzimuth plane radiation pattern of antenna or array
    patternElevationElevation plane radiation pattern of antenna or array
    peakRadiationCalculate and mark maximum radiation points of antenna or array on radiation pattern
    rcsCalculate and plot monostatic and bistatic radar cross section (RCS) of platform, antenna, or array
    resonantFrequencyCalculate and plot resonant frequency of antenna
    returnLossCalculate and plot return loss of antenna or scan return loss of array
    showDisplay antenna, array structures, shapes, or platform
    sparametersCalculate S-parameters for antenna or array
    stlwriteWrite mesh information to STL file
    vswrCalculate and plot voltage standing wave ratio (VSWR) of antenna or array element

    Examples

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    Open Live Script

    Create a rectangular dielectric resonator antenna with default properties.

    ant = draRectangular
    ant = 
  draRectangular with properties:

      ResonatorLength: 0.0300
       ResonatorWidth: 0.0150
            Substrate: [1x1 dielectric]
    GroundPlaneLength: 0.1600
     GroundPlaneWidth: 0.1000
            FeedWidth: 1.0000e-03
           FeedHeight: 0.0100
           FeedOffset: [0 0]
            Conductor: [1x1 metal]
                 Tilt: 0
             TiltAxis: [1 0 0]
                 Load: [1x1 lumpedElement]

    View the antenna using the show function.

    show(ant)

    Figure contains an axes object. The axes object with title draRectangular antenna element, xlabel x (mm), ylabel y (mm) contains 5 objects of type patch, surface. These objects represent PEC, feed, customdielectric.

    Open Live Script

    Plot the radiation pattern of a rectangular dielectric resonator antenna at a frequency of 4 GHz.

    ant = draRectangular(ResonatorLength=0.045, ResonatorWidth=0.02);
pattern(ant,4e9)

    Figure contains 2 axes objects and other objects of type uicontrol. Axes object 1 contains 5 objects of type patch, surface. This object represents customdielectric. Hidden axes object 2 contains 17 objects of type surface, line, text, patch. This object represents customdielectric.

    Open Live Script

    Create a rectangular dielectric resonator antenna with FR4, Teflon, and foam as substrates.

     ant = draRectangular;
 d = dielectric("FR4","Teflon","Foam");
 d.Thickness = [ant.Substrate.Thickness/3 ant.Substrate.Thickness/3 ant.Substrate.Thickness/3];
 ant.Substrate = d;  
 ant = draRectangular(Substrate=d);
 show(ant)

    Figure contains an axes object. The axes object with title draRectangular antenna element, xlabel x (mm), ylabel y (mm) contains 7 objects of type patch, surface. These objects represent PEC, feed, FR4, Teflon, Foam.

    Create a rectangular dielectric resonator antenna with substrates having relative permittivity of 2.3 and 4.5, respectively. The value of loss tangent for both the substrates is 0.002.

    ant = draRectangular;
d = dielectric;                                                                                                                                                                                                                               
d.Name = {'sub1','sub2'};
d.EpsilonR = [2.3 4.5];
d.LossTangent = [0.002 0.002];
d.Thickness = [ant.Substrate.Thickness/2 ant.Substrate.Thickness/2];
ant.Substrate = d;
show(ant)

    Figure contains an axes object. The axes object with title draRectangular antenna element, xlabel x (mm), ylabel y (mm) contains 6 objects of type patch, surface. These objects represent PEC, feed, sub1, sub2.

    More About

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    References

    [1] McAllister, M.W., S.A. Long, and G.L. Conway. “Rectangular Dielectric Resonator Antenna.” Electronics Letters 19, no. 6 (1983): 218.

    Version History

    Introduced in R2021a

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    Objects

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