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draCylindrical

Create cylindrical dielectric resonator antenna

Since R2021a

    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 feed point at the origin.

    example

    ant = draCylindrical(Name=Value) creates a cylindrical dielectric resonator antenna with additional Properties specified using one or more name-value arguments. Name is the property name and Value is the corresponding value. You can specify several name-value pair arguments in any order as Name1=Value1, ..., NameN=ValueN. Properties you do not specify retains their default values.

    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: 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 less than the ground plane dimensions.

    Example: dielectric("FR4")

    Example: dielectric(Name="sub1", EpsilonR=2.3, LossTangent=0.002, Thickness=0.01)

    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 the y-axis. Set 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: 0.060

    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 metallic 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: 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. For more information, see lumpedElement.

    Example: lumpedElement(Impedance=75)

    Object Functions

    showDisplay antenna, array structures, shapes, or platform
    axialRatioAxial ratio of antenna
    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
    efficiencyRadiation efficiency of antenna
    EHfieldsElectric and magnetic fields of antennas or embedded electric and magnetic fields of antenna element in arrays
    impedanceInput impedance of antenna or scan impedance of array
    meshMesh properties of metal, dielectric antenna, or array structure
    meshconfigChange meshing mode of antenna, array, custom antenna, custom array, or custom geometry
    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
    rcsCalculate and plot radar cross section (RCS) of platform, antenna, or array
    returnLossReturn loss of antenna or scan return loss of array
    sparametersCalculate S-parameters for antennas and antenna arrays
    vswrVoltage standing wave ratio (VSWR) of antenna or array element

    Examples

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    Create a cylindrical dielectric resonator antenna with default properties.

    ant = draCylindrical
    ant = 
      draCylindrical with properties:
    
          ResonatorRadius: 0.0200
                Substrate: [1x1 dielectric]
        GroundPlaneLength: 0.1400
         GroundPlaneWidth: 0.0800
                FeedWidth: 1.0000e-03
               FeedHeight: 0.0500
               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 draCylindrical antenna element, xlabel x (mm), ylabel y (mm) contains 6 objects of type patch, surface. These objects represent PEC, feed, customdielectric.

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

    pattern(ant,4e9)

    Figure contains an axes object and other objects of type uicontrol. The axes object contains 6 objects of type patch, surface. This object represents customdielectric.

    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)

    Figure contains an axes object. The axes object with title draCylindrical antenna element, xlabel x (mm), ylabel y (mm) contains 10 objects of type patch, surface. These objects represent PEC, feed, FR4, Teflon, Foam.

    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)

    Figure contains an axes object. The axes object with title draCylindrical antenna element, xlabel x (mm), ylabel y (mm) contains 8 objects of type patch, surface. These objects represent PEC, feed, sub1, sub2.

    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.

    Version History

    Introduced in R2021a