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vivaldi

Create Vivaldi notch antenna on ground plane with exponential or linear tapering

Description

The vivaldi object is a Vivaldi notch antenna on a ground plane.

Creation

Description

example

vi = vivaldi creates a Vivaldi notch antenna on a ground plane. By default, the antenna operates at a frequency range of 1–2 GHz and is located in the X-Y plane.

vi = vivaldi(Name,Value) creates Vivaldi notch antenna, with additional properties specified by one, or more name-value pair 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 retain their default values.

Properties

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Taper length of vivaldi, specified a scalar in meters.

Example: 'TaperLength',2e-3

Aperture width, specified as a scalar in meters.

Example: 'ApertureWidth',3e-3

Taper opening rate, specified a scalar. This property determines the rate at which the notch transitions from the feedpoint to the aperture. When OpeningRate is 0, the notch has a linear profile creating a linear tapered slot and for other values it has an exponential profile.

Example: 'OpeningRate',0.3

Data Types: double

Slot line width, specified as a scalar in meters.

Example: 'SlotLineWidth',3

Data Types: double

Cavity termination diameter, specified a scalar in meters.

Example: 'CavityDiameter',2

Data Types: double

Cavity to taper distance of transition, specified as a scalar in meters. By default, this property is measured along the x-axis.

Example: 'CavityToTaperSpacing',3

Data Types: double

Ground plane length, specified as a scalar in meters. By default, ground plane length is measured along the x-axis.

Example: 'GroundPlaneLength',2

Data Types: double

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

Example: 'GroundPlaneWidth',4

Data Types: double

Distance from feed along x-axis, specified a scalar in meters.

Example: 'FeedOffset',3

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

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 origin. For more information, see lumpedElement.

Example: 'Load',lumpedelement. lumpedelement is the object for the load created using lumpedElement.

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

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

Object Functions

axialRatioCalculate and/or plot axial ratio of antenna or array
bandwidthCalculate and/or plot absolute bandwidth 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
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
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 monostatic and bistatic radar cross section (RCS) of platform, antenna, or array
resonantFrequencyCalculate and/or plot resonant frequency of antenna
returnLossReturn loss of antenna or scan return loss of array
showDisplay antenna, array structures, shapes, or platform
sparametersCalculate S-parameters for antennas and antenna arrays
vswrVoltage standing wave ratio (VSWR) of antenna or array element

Examples

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Create and view the default Vivaldi antenna.

vi = vivaldi
vi = 
  vivaldi with properties:

             TaperLength: 0.2430
           ApertureWidth: 0.1050
             OpeningRate: 25
           SlotLineWidth: 5.0000e-04
          CavityDiameter: 0.0240
    CavityToTaperSpacing: 0.0230
       GroundPlaneLength: 0.3000
        GroundPlaneWidth: 0.1250
              FeedOffset: -0.1045
               Conductor: [1x1 metal]
                    Tilt: 0
                TiltAxis: [1 0 0]
                    Load: [1x1 lumpedElement]

show(vi);

Plot the radiation pattern of a vivaldi antenna for a frequency of 3.5 GHz.

vi = vivaldi;
pattern(vi,3.5e9);

References

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

Version History

Introduced in R2015a