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draCylindrical

Create cylindrical dielectric resonator antenna

    Description

    The draCylindrical object creates a cylindrical dielectric resonator antenna. The cylindrical dielectric resonator antenna consists of a cylindrical dielectric placed on the ground plane. It has high power-handling capacity and can provide high gain and bandwidth. These antennas are more suitable for use at microwave frequencies. Cylindrical dielectric resonator antennas are widely used in medium- and long-range communications.

    Cylindrical DRA geometry, default radiation pattern, and impedance plot.

    Creation

    Description

    example

    ant = draCylindrical creates a cylindrical dielectric resonator antenna with dimensions for a resonant frequency of 1.5 GHz. The default antenna is probe fed with the feedpoint at the origin.

    example

    ant = draCylindrical(Name,Value) sets Properties using one or more name-value pairs. For example, draCylindrical('ResonatorRadius',0.04) creates a cylindrical dielectric resonator antenna with the radius of the dielectric resonator set to 40 mm.

    Properties

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

    Example: 'ResonatorRadius',0.05

    Data Types: double

    Type of dielectric material used as a substrate, specified as a dielectric material object. You can choose any material from the DielectricCatalog or use your own dielectric material. For more information, see dielectric. For more information on dielectric substrate meshing, see Meshing.

    Note

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

    Example: d = dielectric('FR4'); 'Substrate',d

    Example: d = dielectric; d.Name = 'sub1'; d.EpsilonR = 2.3; d.LossTangent = 0.002; d.Thickness = 0.01; ant.Substrate = d;

    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: 'GroundPlaneLength',120e-3

    Data Types: double

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

    Example: 'GroundPlaneWidth',118e-3

    Data Types: double

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

    Example: 'FeedWidth',5e-05

    Data Types: double

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

    Example: 'FeedHeight',0.060

    Data Types: double

    Signed distance of the feedpoint from the center of the ground plane, specified as a two-element vector in meters.

    Example: 'FeedOffset',[–0.0070 0.01]

    Data Types: double

    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

    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.

    Data Types: double

    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'

    Lumped elements added to the antenna feed, specified as a lumpedElement 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, where lumpedelement is the load added to the antenna feed.

    Example: ant.Load = lumpedElement('Impedance',75)

    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
    efficiencyRadiation efficiency of antenna
    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
    optimizeOptimize antenna or array using SADEA optimizer
    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
    rcsCalculate and plot radar cross section (RCS) of platform, 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 a cylindrical dielectric resonator antenna with default properties.

    ant = draCylindrical
    ant = 
      draCylindrical with properties:
    
          ResonatorRadius: 0.0200
                Substrate: [1×1 dielectric]
        GroundPlaneLength: 0.1400
         GroundPlaneWidth: 0.0800
                FeedWidth: 1.0000e-03
               FeedHeight: 0.0500
               FeedOffset: [0 0]
                Conductor: [1×1 metal]
                     Tilt: 0
                 TiltAxis: [1 0 0]
                     Load: [1×1 lumpedElement]
    
    

    View the antenna using the show function.

    show(ant)

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

    pattern(ant,4e9)

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

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

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

    ant = draCylindrical;
    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)

    More About

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    References

    [1] Keyrouz, S., and D. Caratelli. “Dielectric Resonator Antennas: Basic Concepts, Design Guidelines, and Recent Developments at Millimeter-Wave Frequencies.” International Journal of Antennas and Propagation 2016 (2016): 1–20.

    Introduced in R2021a