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bicone

Create bicone antenna

Since R2019b

Description

The bicone object creates a bicone antenna. A bicone antenna consists of two symmetrical or asymmetrical cones separated by a small gap. The feed spans the gap and connects both the cones.

Bicone antennas are broadband omnidirectional antennas used for electronic support measure (ESM) applications. Bicone antennas are often used in electromagnetic interference (EMI) testing for immunity testing or emissions testing.

Creation

Description

example

ant = bicone creates a bicone antenna with dimensions for a resonant frequency of 2.3 GHz. The default bicone has a feedpoint at the apex of the top cone.

example

ant = bicone(Name,Value) sets properties using one or more name-value pairs. For example, ant = bicone('Height',1) creates a bicone antenna with a cone of height 1 meter.

Properties

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Vertical height of the cones, specified as a real-valued scalar in meters or a two-element vector with each element unit in meters. A scalar value creates two cones of the same height. The two-element vector can create 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',[0.0215 0.0315]

Example: ant.ConeHeight = [0.0215 0.0315]

Data Types: double

Radius at the apex of the cones, specified as a real-valued scalar in meters or a two-element vector with each element unit in meters. A scalar value creates two cones with the same narrow radius. A two-element vector can create 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',[6.3300e-04 0.0546]

Example: ant.NarrowRadius = [6.3300e-04 0.0546]

Data Types: double

Radius at the broad opening of the cones, specified as a real-valued scalar in meters or a two-element vector with each element unit in meters. A scalar value creates two cones with the same broad radius. A two-element vector can create two cones of 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',[8.3300e-04 0.0846]

Example: ant.BroadRadius = [8.3300e-04 0.0846]

Data Types: double

Gap between the two cones, specified as a real-valued scalar in meters.

Example: 'FeedHeight',0.0034

Example: ant.FeedHeight = 0.0034

Data Types: double

Width of the feed, specified as a real-valued scalar in meters.

Example: 'FeedWidth',0.0050

Example: ant.FeedWidth = 0.0050

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 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)

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
coneangle2sizeCalculates equivalent cone height, broad radius, and narrow radius
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 a default bicone antenna.

ant = bicone
ant = 
  bicone with properties:

      ConeHeight: 0.0215
    NarrowRadius: 0.0013
     BroadRadius: 0.0385
      FeedHeight: 5.0000e-04
       FeedWidth: 1.0000e-03
       Conductor: [1x1 metal]
            Tilt: 0
        TiltAxis: [1 0 0]
            Load: [1x1 lumpedElement]

show(ant)

Plot the radiation pattern of the antenna at 2.3 GHz.

pattern(ant,2.3e9)

Create a bicone antenna with asymmetrical cones.

ant = bicone('NarrowRadius',[2e-3 4e-3],'BroadRadius',...
           [44.7e-3,60e-3],'ConeHeight',[33.7e-3 40e-3],'FeedHeight',...
           1e-3,'FeedWidth',2e-3)
ant = 
  bicone with properties:

      ConeHeight: [0.0337 0.0400]
    NarrowRadius: [0.0020 0.0040]
     BroadRadius: [0.0447 0.0600]
      FeedHeight: 1.0000e-03
       FeedWidth: 0.0020
       Conductor: [1x1 metal]
            Tilt: 0
        TiltAxis: [1 0 0]
            Load: [1x1 lumpedElement]

show(ant)

Calculate the impedance of the antenna over the frequency span of 500 MHz - 5 GHz.

impedance(ant,linspace(0.5e9,5e9,51));

References

[1] Kudpik, Rapin & Komask Meksamoot, Nipapon Siripon, and Sompol Kosulvit. "Design of a Compact Biconical Antenna for UWB Applications." 10.1109/ISPACS.2011.6146212.

Version History

Introduced in R2019b