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

Syntax

ant = bicone

ant = bicone(Name,Value)

Description

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.

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

ConeHeight — Vertical height of cones

0.0215 (default) | real-valued scalar | two-element vector

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

NarrowRadius — Radius at apex of cones

0.0013 (default) | real-valued scalar | two-element vector

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

BroadRadius — Radius at broad opening of cones

0.00385 (default) | real-valued scalar | two-element vector

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

FeedHeight — Gap between two cones

3.1980e-04 (default) | real-valued scalar

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

FeedWidth — Width of feed

4.2640e-04 (default) | real-valued scalar

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

Example: 'FeedWidth',0.0050

Example: ant.FeedWidth = 0.0050

Data Types: double

Conductor — Type of metal material

'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) | lumped element 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 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 — Tilt angle of antenna

0 (default) | scalar | vector

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 degrees about the two axes defined by the vectors.

Note

The wireStack antenna object only accepts the dot method to change its properties.

Data Types: double

TiltAxis — Tilt axis of antenna

[1 0 0] (default) | three-element vector of Cartesian coordinates | two three-element vectors of Cartesian coordinates | 'X' | 'Y' | 'Z'

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: TiltAxis = 'Z'

Data Types: double

Object Functions

coneangle2size	Calculates equivalent cone height, broad radius, and narrow radius for cone
show	Display antenna, array structures or shapes
axialRatio	Axial ratio of antenna
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
efficiency	Radiation efficiency of antenna
EHfields	Electric and magnetic fields of antennas; Embedded electric and magnetic fields of antenna element in arrays
impedance	Input impedance of antenna; scan impedance of array
mesh	Mesh properties of metal, dielectric antenna, or array structure
meshconfig	Change mesh mode of antenna structure
optimize	Optimize antenna or array using SADEA optimizer
pattern	Radiation pattern and phase of antenna or array; Embedded pattern of antenna element in array
patternAzimuth	Azimuth pattern of antenna or array
patternElevation	Elevation pattern of antenna or array
rcs	Calculate and plot radar cross section (RCS) of platform, antenna, or array
returnLoss	Return loss of antenna; scan return loss of array
sparameters	Calculate S-parameter for antenna and antenna array objects
vswr	Voltage standing wave ratio of antenna

Examples

Default Bicone Antenna and Radiation Pattern

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)

Impedance of Bicone Antenna with Asymmetrical Cones

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