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bowtieTriangular

Create planar bowtie dipole antenna

Description

The bowtieTriangular object is a planar bowtie antenna on the Y-Z plane. The default planar bowtie dipole is center-fed. The feed point coincides with the origin. The origin is located on the Y-Z plane.

Creation

Syntax

bt = bowtieTriangular
bt = bowtieTriangular(Name,Value)

Description

bt = bowtieTriangular creates a half-wavelength planar bowtie antenna.

example

bt = bowtieTriangular(Name,Value) creates a planar bowtie 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 not specified retain their default values.

Properties

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Planar bowtie length, specified as a scalar in meters. By default, the length is chosen for the operating frequency of 410 MHz.

Example: 'Length',3

Data Types: double

Planar bowtie flare angle near the feed, specified as a scalar in meters.

Note

Flare angle should be less than 175 degrees and greater than 5 degrees.

Example: 'FlareAngle',80

Data Types: double

Lumped elements added to the antenna feed, specified as a lumped element object handle. For more information, see lumpedElement.

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

Tilt angle of antenna, specified as a scalar or vector with each element unit in degrees.

Example: 'Tilt',90

Example: 'Tilt',[90 90 0]

Data Types: double

Tilt axis of the antenna, specified as:

  • A three-element vector 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 as three-element vectors of Cartesian coordinates. In this case, the antenna rotates along the line joining the two points.

  • A string input for simple rotations around the principal planes, X, Y, or Z.

For more information see, Rotate Antenna and Arrays

Example: 'TiltAxis',[0 1 0]

Example: 'TiltAxis',[0 0 0;0 1 0]

Example: 'TiltAxis','Z'

Data Types: double

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 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 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 a center-fed planar bowtie antenna that has a 60 degrees flare angle.

b = bowtieTriangular('FlareAngle',60)
b = 
  bowtieTriangular with properties:

        Length: 0.2000
    FlareAngle: 60
          Tilt: 0
      TiltAxis: [1 0 0]
          Load: [1x1 lumpedElement]

show(b)

Calculate and plot the impedance of a planar bowtie antenna over a frequency range of 300MHz-500MHz.

b = bowtieTriangular('FlareAngle',60);
impedance(b,linspace(300e6,500e6,51))

References

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

[2] Brown, G.H., and O.M. Woodward Jr. “Experimentally Determined Radiation Characteristics of Conical and Triangular Antennas”. RCA Review. Vol.13, No.4, Dec.1952, pp. 425–452

Introduced in R2015a

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