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dipoleCylindrical

Create cylindrical dipole antenna

Since R2021a

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    Description

    The dipoleCylindrical object creates a center-fed cylindrical dipole antenna resonating around 70 MHz. The length of the cylindrical dipole corresponds to half of the wavelength at the operating frequency. These antennas are used in wireless communication applications requiring thicker dipoles due to their simple design.

    Cylindrical dipole antenna geometry, default radiation pattern, and impedance plot.

    Creation

    Syntax

    ant = dipoleCylindrical
    ant = dipoleCylindrical(Name=Value)

    Description

    ant = dipoleCylindrical creates a center-fed cylindrical dipole antenna with default property values. The default dimensions are chosen for an operating frequency of around 70 MHz.

    example

    ant = dipoleCylindrical(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, ant = dipoleCylindrical(Radius=0.04) creates a cylindrical dipole antenna with radius of 0.04 meters.

    example

    Properties

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

    Example: 3

    Data Types: double

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

    Example: 0.05

    Data Types: double

    Signed distance from the center along Z-axis, specified as a real-valued scalar in meters.

    Example: -0.2

    Data Types: double

    Determine if the dipole ends are closed with a flat cap or left open, specified as 0 or 1. Specify 1 for closed ends of the dipole and 0 for open ends.

    Example: 1

    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
    cylinder2stripCylinder equivalent width approximation
    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
    strip2cylinderCalculate equivalent radius approximation for strip
    vswrCalculate and plot voltage standing wave ratio (VSWR) of antenna or array element

    Examples

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    Open Live Script

    Create a cylindrical dipole antenna with default properties.

    ant = dipoleCylindrical
    ant = 
  dipoleCylindrical with properties:

        Length: 2
        Radius: 0.0250
    FeedOffset: 0
     ClosedEnd: 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 dipoleCylindrical antenna element, xlabel x (m), ylabel y (m) contains 3 objects of type patch, surface. These objects represent PEC, feed.

    Plot the radiation pattern of the cylindrical dipole antenna at a frequency of 70 MHz.

    pattern(ant,70e6)

    Figure contains 2 axes objects and other objects of type uicontrol. Axes object 1 contains 3 objects of type patch, surface. Hidden axes object 2 contains 17 objects of type surface, line, text, patch.

    Open Live Script

    Create a center-fed cylindrical dipole with a length of 2 m and a radius of 0.06 m.

    ant = dipoleCylindrical(Length=2, Radius=0.06)
    ant = 
  dipoleCylindrical with properties:

        Length: 2
        Radius: 0.0600
    FeedOffset: 0
     ClosedEnd: 0
     Conductor: [1x1 metal]
          Tilt: 0
      TiltAxis: [1 0 0]
          Load: [1x1 lumpedElement]

    Plot the impedance over a frequency range of 50 MHz to 120 MHz.

    impedance(ant,linspace(50e6,120e6,51))

    Figure contains an axes object. The axes object with title Impedance, xlabel Frequency (MHz), ylabel Impedance (ohms) contains 2 objects of type line. These objects represent Resistance, Reactance.

    Open Live Script

    Create cylindrical dipole antennas with an open-ended top and a close-ended top, respectively.

    antOpenEnded = dipoleCylindrical(Radius=0.1);
antClosedEnded = dipoleCylindrical(Radius=0.1, ClosedEnd=1);

    Calculate and plot the current distribution for the cylindrical dipole antennas at frequency of 70 MHz.

    iOpenEnded  = current(antOpenEnded,70e6)
    iOpenEnded = 3×400 complex

  -0.0000 - 0.0002i  -0.0000 - 0.0005i  -0.0000 - 0.0007i  -0.0000 - 0.0005i  -0.0000 - 0.0002i   0.0000 + 0.0002i   0.0000 + 0.0005i   0.0000 + 0.0007i   0.0000 + 0.0005i   0.0000 + 0.0002i   0.0000 + 0.0003i   0.0000 + 0.0007i   0.0000 + 0.0009i   0.0000 + 0.0007i   0.0000 + 0.0003i  -0.0000 - 0.0003i  -0.0000 - 0.0007i  -0.0000 - 0.0009i  -0.0000 - 0.0007i  -0.0000 - 0.0003i  -0.0000 - 0.0001i  -0.0000 - 0.0002i  -0.0000 - 0.0002i  -0.0000 - 0.0002i  -0.0000 - 0.0001i   0.0000 + 0.0001i   0.0000 + 0.0002i   0.0000 + 0.0002i   0.0000 + 0.0002i   0.0000 + 0.0001i   0.0000 + 0.0000i   0.0000 + 0.0001i   0.0001 + 0.0001i   0.0000 + 0.0001i   0.0000 + 0.0000i  -0.0000 - 0.0000i  -0.0000 - 0.0001i  -0.0001 - 0.0001i  -0.0000 - 0.0001i  -0.0000 - 0.0000i  -0.0000 - 0.0000i  -0.0001 - 0.0001i  -0.0001 - 0.0001i  -0.0001 - 0.0001i  -0.0000 - 0.0000i   0.0000 + 0.0000i   0.0001 + 0.0001i   0.0001 + 0.0001i   0.0001 + 0.0001i   0.0000 + 0.0000i
   0.0000 + 0.0006i   0.0000 + 0.0004i   0.0000 + 0.0000i  -0.0000 - 0.0004i  -0.0000 - 0.0006i  -0.0000 - 0.0006i  -0.0000 - 0.0004i   0.0000 + 0.0000i   0.0000 + 0.0004i   0.0000 + 0.0006i  -0.0000 - 0.0008i  -0.0000 - 0.0005i   0.0000 + 0.0000i   0.0000 + 0.0005i   0.0000 + 0.0008i   0.0000 + 0.0008i   0.0000 + 0.0005i   0.0000 + 0.0000i  -0.0000 - 0.0005i  -0.0000 - 0.0008i   0.0000 + 0.0002i   0.0000 + 0.0001i   0.0000 + 0.0000i  -0.0000 - 0.0001i  -0.0000 - 0.0002i  -0.0000 - 0.0002i  -0.0000 - 0.0001i   0.0000 + 0.0000i   0.0000 + 0.0001i   0.0000 + 0.0002i  -0.0001 - 0.0001i  -0.0000 - 0.0001i   0.0000 + 0.0000i   0.0000 + 0.0001i   0.0001 + 0.0001i   0.0001 + 0.0001i   0.0000 + 0.0001i   0.0000 + 0.0000i  -0.0000 - 0.0001i  -0.0001 - 0.0001i   0.0001 + 0.0001i   0.0000 + 0.0000i   0.0000 + 0.0000i  -0.0000 - 0.0000i  -0.0001 - 0.0001i  -0.0001 - 0.0001i  -0.0000 - 0.0000i   0.0000 + 0.0000i   0.0000 + 0.0000i   0.0001 + 0.0001i
  -0.0191 - 0.0016i  -0.0191 - 0.0016i  -0.0191 - 0.0016i  -0.0191 - 0.0016i  -0.0191 - 0.0016i  -0.0191 - 0.0016i  -0.0191 - 0.0016i  -0.0191 - 0.0016i  -0.0191 - 0.0016i  -0.0191 - 0.0016i  -0.0190 + 0.0033i  -0.0190 + 0.0033i  -0.0190 + 0.0033i  -0.0190 + 0.0033i  -0.0190 + 0.0033i  -0.0190 + 0.0033i  -0.0190 + 0.0033i  -0.0190 + 0.0033i  -0.0190 + 0.0033i  -0.0190 + 0.0033i  -0.0189 + 0.0036i  -0.0189 + 0.0036i  -0.0189 + 0.0036i  -0.0189 + 0.0036i  -0.0189 + 0.0036i  -0.0189 + 0.0036i  -0.0189 + 0.0036i  -0.0189 + 0.0036i  -0.0189 + 0.0036i  -0.0189 + 0.0036i  -0.0185 + 0.0046i  -0.0185 + 0.0046i  -0.0185 + 0.0046i  -0.0185 + 0.0046i  -0.0185 + 0.0046i  -0.0185 + 0.0046i  -0.0185 + 0.0046i  -0.0185 + 0.0046i  -0.0185 + 0.0046i  -0.0185 + 0.0046i  -0.0183 + 0.0049i  -0.0183 + 0.0049i  -0.0183 + 0.0049i  -0.0183 + 0.0049i  -0.0183 + 0.0049i  -0.0183 + 0.0049i  -0.0183 + 0.0049i  -0.0183 + 0.0049i  -0.0183 + 0.0049i  -0.0183 + 0.0049i


    current(antOpenEnded,70e6)

    Figure contains an axes object. The axes object with title Current distribution, xlabel x (m), ylabel y (m) contains 3 objects of type patch.

    iClosedEnded = current(antClosedEnded,70e6)
    iClosedEnded = 3×428 complex

  -0.0000 - 0.0002i  -0.0000 - 0.0005i  -0.0000 - 0.0007i  -0.0000 - 0.0005i  -0.0000 - 0.0002i   0.0000 + 0.0002i   0.0000 + 0.0005i   0.0000 + 0.0007i   0.0000 + 0.0005i   0.0000 + 0.0002i   0.0000 + 0.0003i   0.0000 + 0.0007i   0.0000 + 0.0008i   0.0000 + 0.0007i   0.0000 + 0.0003i  -0.0000 - 0.0003i  -0.0000 - 0.0007i  -0.0000 - 0.0008i  -0.0000 - 0.0007i  -0.0000 - 0.0003i  -0.0000 - 0.0001i  -0.0000 - 0.0002i  -0.0000 - 0.0002i  -0.0000 - 0.0002i  -0.0000 - 0.0001i   0.0000 + 0.0001i   0.0000 + 0.0002i   0.0000 + 0.0002i   0.0000 + 0.0002i   0.0000 + 0.0001i   0.0000 + 0.0000i   0.0000 + 0.0001i   0.0001 + 0.0001i   0.0000 + 0.0001i   0.0000 + 0.0000i  -0.0000 - 0.0000i  -0.0000 - 0.0001i  -0.0001 - 0.0001i  -0.0000 - 0.0001i  -0.0000 - 0.0000i  -0.0000 - 0.0000i  -0.0001 - 0.0001i  -0.0001 - 0.0001i  -0.0001 - 0.0001i  -0.0000 - 0.0000i   0.0000 + 0.0000i   0.0001 + 0.0001i   0.0001 + 0.0001i   0.0001 + 0.0001i   0.0000 + 0.0000i
   0.0000 + 0.0006i   0.0000 + 0.0004i   0.0000 + 0.0000i  -0.0000 - 0.0004i  -0.0000 - 0.0006i  -0.0000 - 0.0006i  -0.0000 - 0.0004i   0.0000 + 0.0000i   0.0000 + 0.0004i   0.0000 + 0.0006i  -0.0000 - 0.0008i  -0.0000 - 0.0005i   0.0000 + 0.0000i   0.0000 + 0.0005i   0.0000 + 0.0008i   0.0000 + 0.0008i   0.0000 + 0.0005i   0.0000 + 0.0000i  -0.0000 - 0.0005i  -0.0000 - 0.0008i   0.0000 + 0.0002i   0.0000 + 0.0001i   0.0000 + 0.0000i  -0.0000 - 0.0001i  -0.0000 - 0.0002i  -0.0000 - 0.0002i  -0.0000 - 0.0001i   0.0000 + 0.0000i   0.0000 + 0.0001i   0.0000 + 0.0002i  -0.0001 - 0.0001i  -0.0000 - 0.0001i   0.0000 + 0.0000i   0.0000 + 0.0001i   0.0001 + 0.0001i   0.0001 + 0.0001i   0.0000 + 0.0001i   0.0000 + 0.0000i  -0.0000 - 0.0001i  -0.0001 - 0.0001i   0.0001 + 0.0001i   0.0000 + 0.0000i   0.0000 + 0.0000i  -0.0000 - 0.0000i  -0.0001 - 0.0001i  -0.0001 - 0.0001i  -0.0000 - 0.0000i   0.0000 + 0.0000i   0.0000 + 0.0000i   0.0001 + 0.0001i
  -0.0180 - 0.0011i  -0.0180 - 0.0011i  -0.0180 - 0.0010i  -0.0180 - 0.0011i  -0.0180 - 0.0010i  -0.0180 - 0.0010i  -0.0180 - 0.0011i  -0.0180 - 0.0010i  -0.0180 - 0.0011i  -0.0180 - 0.0010i  -0.0179 + 0.0038i  -0.0179 + 0.0038i  -0.0179 + 0.0038i  -0.0179 + 0.0038i  -0.0179 + 0.0038i  -0.0179 + 0.0038i  -0.0179 + 0.0038i  -0.0179 + 0.0038i  -0.0179 + 0.0038i  -0.0179 + 0.0038i  -0.0178 + 0.0041i  -0.0178 + 0.0041i  -0.0178 + 0.0041i  -0.0178 + 0.0041i  -0.0178 + 0.0041i  -0.0178 + 0.0041i  -0.0178 + 0.0041i  -0.0178 + 0.0041i  -0.0178 + 0.0041i  -0.0178 + 0.0041i  -0.0175 + 0.0052i  -0.0175 + 0.0052i  -0.0175 + 0.0052i  -0.0175 + 0.0052i  -0.0175 + 0.0052i  -0.0175 + 0.0052i  -0.0175 + 0.0052i  -0.0175 + 0.0052i  -0.0175 + 0.0052i  -0.0175 + 0.0052i  -0.0173 + 0.0055i  -0.0173 + 0.0055i  -0.0173 + 0.0055i  -0.0173 + 0.0055i  -0.0173 + 0.0055i  -0.0173 + 0.0055i  -0.0173 + 0.0055i  -0.0173 + 0.0055i  -0.0173 + 0.0055i  -0.0173 + 0.0055i


    current(antClosedEnded,70e6)

    Figure contains an axes object. The axes object with title Current distribution, xlabel x (m), ylabel y (m) contains 3 objects of type patch.

    More About

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    References

    [1] King Ronald W.P. Characteristics of Cylindrical Dipoles and Monopoles. Boston, MA: Springer, 1971.

    Version History

    Introduced in R2021a

    See Also

    Objects

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