bicone

Create bicone antenna

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.

Output Arguments

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Bicone antenna, returned as a bicone object.

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

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

Example: 'FeedWidth',0.0050

Example: ant.FeedWidth = 0.0050

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 feed. For more information, see lumpedElement.

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

Example: ant.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
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 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
            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
            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.

Introduced in R2019b