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 retains 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

Lumped elements added to the antenna feed, specified as a lumped element object handle. 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 handle for the load created using lumpedElement.

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

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: 'Tilt',[90 90],'TiltAxis',[0 1 0;0 1 1] tilts the antenna at 90 degree about two axes, defined by vectors.

Data Types: double

Tilt axis of the antenna, specified as:

  • Three-element vectors of Cartesian coordinates in meters. In this case, each 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'

Object Functions

showDisplay antenna or array structure; Display shape as filled patch
infoDisplay information about antenna or array
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
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
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
returnLossReturn loss of antenna; scan return loss of array
sparametersS-parameter object
vswrVoltage standing wave ratio of antenna

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
                    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.

Introduced in R2015a