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vivaldiAntipodal

Create an antipodal Vivaldi element

Since R2020a

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Description

The default vivaldiAntipodal object creates an antipodal Vivaldi antenna resonating around 3.22 GHz. Antipodal Vivaldi come under the group of end-fire tapered slot antennas, and such antennas are expected to provide medium gain with less side lobes and wide bandwidth. These antennas are low cost, geometrically simple in shape, and mostly used in wireless communications and radar applications.

Default view of an antipodal vivaldi antenna element showing the antenna parameters and the feed location.

Creation

Syntax

ant = vivaldiAntipodal
ant = vivaldiAntipodal(Name=Value)

Description

ant = vivaldiAntipodal creates an antipodal Vivaldi antenna object with default property values. The default antenna is centered at the origin. The default dimensions are chosen for an operating frequency of around 3.22 GHz.

ant = vivaldiAntipodal(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, aviv = vivaldiAntipodal(BoardLength=0.2) creates an antipodal Vivaldi with a board length of 0.2 m.

example

Properties

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Length of the PCB, specified as a scalar in meter.

Example: 2e-3

Width of the PCB, specified as a scalar in meter.

Example: 2e-3

Height of the PCB, specified as a scalar in meter.

Example: 1e-6

Opening rate of taper, specified as a scalar. This property determines the rate at which the notch transitions from the feed point to the aperture. Minimum value of OpeningRate is 1 and maximum value of is 80.

Example: 1.2

Data Types: double

Taper length at antenna's inner edge, specified as a scalar in meters.

Example: 2e-3

Taper length at antenna's outer edge, specified as a scalar in meter.

Example: 2e-3

Width of the aperture, specified as a scalar in meters.

Example: 3e-3

Width of the strip used at feed point, specified as a scalar in meters.

Example: 0.3

Data Types: double

Ground plane width, specified a scalar in meters. By default, ground plane width is measured along the y-axis.

Example: 4

Data Types: double

Type of dielectric material used as a substrate, specified as a dielectric object. For more information, see dielectric. For more information on dielectric substrate meshing, see Meshing. By default, the dielectric is Rogers RO4003C with EpsilonR of 3.38, LossTangent of 0.0027, and Thickness of 0.000508

Example: ant = vivaldiAntipodal(Substrate=dielectric(Name="RO4003C",EpsilonR=3.38,LossTangent=0.0027,Thickness=0.6e-3))

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 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 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: avi.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 an antipodal Vivaldi antenna object with the specified properties.

avi = vivaldiAntipodal(OpeningRate=30,Substrate=dielectric(Name="RO4003C",EpsilonR=3.38,LossTangent=0.0027,...
    Thickness=0.508e-3))
avi = 
  vivaldiAntipodal with properties:

         BoardLength: 0.2020
          BoardWidth: 0.1200
              Height: 5.0800e-04
         OpeningRate: 30
      StripLineWidth: 0.0011
    OuterTaperLength: 0.0800
    InnerTaperLength: 0.1870
       ApertureWidth: 0.0840
    GroundPlaneWidth: 0.0500
           Substrate: [1x1 dielectric]
           Conductor: [1x1 metal]
                Tilt: 0
            TiltAxis: [1 0 0]
                Load: [1x1 lumpedElement]

View the antenna.

show(avi)

Figure contains an axes object. The axes object with title vivaldiAntipodal antenna element, xlabel x (mm), ylabel y (mm) contains 5 objects of type patch, surface. These objects represent PEC, feed, RO4003C.

Open Live Script

Plot the radiation pattern of the antipodal Vivaldi antenna at 3 GHz 

avi = vivaldiAntipodal(OpeningRate=30,Substrate=dielectric(Name="RO4003C",EpsilonR=3.38,...
    LossTangent=0.0027,Thickness=0.508e-3))
avi = 
  vivaldiAntipodal with properties:

         BoardLength: 0.2020
          BoardWidth: 0.1200
              Height: 5.0800e-04
         OpeningRate: 30
      StripLineWidth: 0.0011
    OuterTaperLength: 0.0800
    InnerTaperLength: 0.1870
       ApertureWidth: 0.0840
    GroundPlaneWidth: 0.0500
           Substrate: [1x1 dielectric]
           Conductor: [1x1 metal]
                Tilt: 0
            TiltAxis: [1 0 0]
                Load: [1x1 lumpedElement]


pattern(avi,3e9)

Figure contains 2 axes objects and other objects of type uicontrol. Axes object 1 contains 5 objects of type patch, surface. This object represents RO4003C. Hidden axes object 2 contains 17 objects of type surface, line, text, patch. This object represents RO4003C.

References

[1] Balanis, C.A. Antenna Theory. Analysis and Design, 3rd Ed. New York: Wiley, 2005.

Version History

Introduced in R2020a

See Also

Objects

Topics