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biconeStrip

Create strip bicone antenna

Description

The biconeStrip object creates a strip bicone antenna. The strip bicone antenna is an approximation of a solid bicone antenna, where strips are used to approximate the two cones. The strip configuration makes these antennas lightweight and reduces wind loading. These antennas are more suitable for use at low frequencies. Strip bicone antennas are popular for their wide-impedance bandwidth and omnidirectional radiation coverage. These antennas are used in applications like emission testing, field monitoring, and chamber characterization.

Strip bicone antenna geometry, default radiation pattern, and impedance plot.

There are two types of bicone strip antennas, open-ended and phantom biconical. Specify the HatHeight property to create a phantom strip bicone antenna.

Creation

Description

example

ant = biconeStrip creates a strip bicone antenna with dimensions for a resonant frequency of 363.2 MHz.

example

ant = biconeStrip(Name,Value) sets Properties using one or more name-value pairs. For example, ant = biconeStrip('NumStrips', 8) creates a strip bicone antenna with eight strips.

Properties

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Number of strips to form the two cones of strip bicone antenna, specified a scalar integer in the range [6,64].

Example: 'NumStrips',8

Example: ant.NumStrips = 8

Data Types: double

Width of each strip, specified as positive scalar in meters.

Example: 'StripWidth',0.02

Example: ant.StripWidth = 0.02

Data Types: double

Vertical height of the two hats, specified as either of the following:

  • 0— This creates open-ended strip bicone antenna.

  • Positive scalar in meters— This creates two cone hats of same height.

  • Two-element vector with each element unit in meters— This creates two cone hats of different heights. In the two-element vector, the first element specifies the hat height of the top cone, and the second element specifies the hat height of the bottom cone.

Example: 'HatHeight',0.045

Example: ant.HatHeight = 0.045

Data Types: double

Vertical height of the two cones, specified as either of the following:

  • Positive scalar in meters: This creates two cones of same height.

  • Two-element vector with each element unit in meters: This creates two cones of different heights. In the two-element vector, the first element specifies the height of the top cone, and the second element specifies the height of the bottom cone.

Example: 'ConeHeight',0.5

Example: ant.ConeHeight = 0.5

Data Types: double

Radius at the apex of the cones, specified as either of the following:

  • Positive scalar in meters: This creates two cones with the same narrow radius.

  • Two-element vector with each element unit in meters: This creates two cones with different narrow radii. In the two-element vector, the first element specifies the narrow radius of the top cone, and the second element specifies the narrow radius of the bottom cone.

Example: 'NarrowRadius',0.04

Example: ant.NarrowRadius = 0.04

Data Types: double

Radius at the broad opening of the cones, specified as either of the following:

  • Positive scalar in meters: This creates two cones with the same broad radius.

  • Two-element vector with each element unit in meters: This creates two cones with different broad radii. In the two-element vector, the first element specifies the broad radius of the top cone, and the second element specifies the broad radius of the bottom cone.

Example: 'BroadRadius',0.7

Example: ant.BroadRadius = 0.7

Data Types: double

Height of the feed spanning the gap between the two cones, specified as positive scalar in meters.

Example: 'FeedHeight',0.04

Example: ant.FeedHeight = 0.04

Data Types: double

Width of the feed of the antenna, specified as a positive scalar in meters.

Example: 'FeedWidth',0.03

Example: ant.FeedWidth = 0.03

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

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: ant.Tilt = 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:

  • 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, 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'

Lumped elements added to the antenna feed, specified as a lumpedElement 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: ant.Load = lumpedElement('Impedance',75)

Object Functions

coneangle2sizeCalculates equivalent cone height, broad radius, and narrow radius for cone
showDisplay antenna or array structure; display shape as filled patch
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 around specified frequency
efficiencyRadiation efficiency of antenna
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
optimizeOptimize antenna or array using SADEA optimizer
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
rcsCalculate and plot radar cross section (RCS) of platform, antenna, or array
returnLossReturn loss of antenna; scan return loss of array
sparametersCalculate S-parameter for antenna and antenna array objects
vswrVoltage standing wave ratio of antenna

Examples

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Create a strip bicone antenna with default properties.

ant = biconeStrip
ant = 
  biconeStrip with properties:

       NumStrips: 16
      StripWidth: 0.0180
       HatHeight: 0
      ConeHeight: 0.6650
    NarrowRadius: 0.0700
     BroadRadius: 0.6470
      FeedHeight: 0.0450
       FeedWidth: 0.0400
       Conductor: [1x1 metal]
            Tilt: 0
        TiltAxis: [1 0 0]
            Load: [1x1 lumpedElement]

View the antenna using the show function.

show(ant);

Figure contains an axes object. The axes object with title biconeStrip antenna element contains 7 objects of type patch, surface. These objects represent PEC, feed.

Plot the S-parameters of the antenna over the frequency span of 150-550 MHz.

s = sparameters(ant,linspace(150e6,550e6,101));
rfplot(s)

Figure contains an axes object. The axes object contains an object of type line. This object represents dB(S_{11}).

Create a strip bicone antenna with hat.

ant = biconeStrip("NumStrips",6,"StripWidth",12e-3,"HatHeight",53e-3, ...
    "ConeHeight",465e-3,"NarrowRadius",40e-3,"BroadRadius",257e-3, ...
    "FeedHeight",144e-3,"FeedWidth",25e-3);

View the antenna using the show function.

show(ant)

Figure contains an axes object. The axes object with title biconeStrip antenna element contains 9 objects of type patch, surface. These objects represent PEC, feed.

Calculate antenna impedance over the frequency span of 10-300 MHz.

impedance(ant,10e6:10e6:300e6)

Figure contains an axes object. The axes object with title Impedance contains 2 objects of type line. These objects represent Resistance, Reactance.

More About

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References

[1] Brian A. Austin, Andre P. C. Fourie "Characteristics of the Wire Biconical Antenna Used for EMC Measurements", IEEE Transaction on Electromagnetic Compatibility, vol. 33, no. 3, August 1991.

Introduced in R2020b