vivaldi

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

Description

The default vivaldi object is a Vivaldi notch antenna on a ground plane resonating around 1.28 GHz.

Creation

Syntax

vi = vivaldi

vi = vivaldi(Name=Value)

Description

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

vi = vivaldi(Name=Value) sets propertiesusing 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.

Properties

TaperLength — Taper length

0.243 (default) | scalar

Taper length of Vivaldi, specified a scalar in meters.

Example: 2e-3

ApertureWidth — Aperture width

0.105 (default) | scalar

Aperture width, specified as a scalar in meters.

Example: 3e-3

OpeningRate — Taper opening rate

25 (default) | scalar

Taper opening rate, specified a scalar. This property determines the rate at which the notch transitions from the feed point 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: 0.3

Data Types: double

SlotLineWidth — Slot line width

5e-4 (default) | scalar

Slot line width, specified as a scalar in meters.

Example: 3

Data Types: double

CavityDiameter — Cavity termination diameter

0.024 (default) | scalar

Cavity termination diameter, specified a scalar in meters.

Example: 2

Data Types: double

CavityToTaperSpacing — Cavity to taper distance of transition

0.023 (default) | scalar

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

Example: 3

Data Types: double

GroundPlaneLength — Ground plane length

0.3 (default) | scalar

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

Example: 2

Data Types: double

GroundPlaneWidth — Ground plane width

0.125 (default) | scalar

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

Example: 4

Data Types: double

FeedOffset — Distance from feed along x-axis

-0.1045 (default) | scalar

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

Example: 3

Data Types: double

Conductor — Type of metal material

metal("PEC") (default) | metal object

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

Load — Lumped elements

[1x1 lumpedElement] (default) | lumpedElement object

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 — Tilt angle of antenna

0 (default) | scalar | vector

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

TiltAxis — Tilt axis of antenna

[1 0 0] (default) | three-element vector | 2-by-3 matrix | "X" | "Y" | "Z"

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

axialRatio	Calculate and plot axial ratio of antenna or array
bandwidth	Calculate and plot absolute bandwidth of antenna or array
beamwidth	Beamwidth of antenna
charge	Charge distribution on antenna or array surface
current	Current distribution on antenna or array surface
design	Design prototype antenna or arrays for resonance around specified frequency or create AI-based antenna from antenna catalog objects
efficiency	Calculate and plot radiation efficiency of antenna or array
EHfields	Electric and magnetic fields of antennas or embedded electric and magnetic fields of antenna element in arrays
feedCurrent	Calculate current at feed for antenna or array
impedance	Calculate and plot input impedance of antenna or scan impedance of array
info	Display information about antenna, array, or platform
memoryEstimate	Estimate memory required to solve antenna or array mesh
mesh	Mesh properties of metal, dielectric antenna, or array structure
meshconfig	Change meshing mode of antenna, array, custom antenna, custom array, or custom geometry
msiwrite	Write antenna or array analysis data to MSI planet file
optimize	Optimize antenna or array using SADEA optimizer
pattern	Plot radiation pattern and phase of antenna or array or embedded pattern of antenna element in array
patternAzimuth	Azimuth plane radiation pattern of antenna or array
patternElevation	Elevation plane radiation pattern of antenna or array
peakRadiation	Calculate and mark maximum radiation points of antenna or array on radiation pattern
rcs	Calculate and plot monostatic and bistatic radar cross section (RCS) of platform, antenna, or array
resonantFrequency	Calculate and plot resonant frequency of antenna
returnLoss	Calculate and plot return loss of antenna or scan return loss of array
show	Display antenna, array structures, shapes, or platform
sparameters	Calculate S-parameters for antenna or array
stlwrite	Write mesh information to STL file
vswr	Calculate and plot voltage standing wave ratio (VSWR) of antenna or array element

Examples

Create and View Vivaldi Antenna

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);

Radiation Pattern of Vivaldi Antenna

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