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disconeStrip

Create strip discone antenna

Description

The disconeStrip antenna object creates a strip discone antenna. The strip discone antenna is an approximation to a solid discone antenna, where the cone and the disc are replaced with strips. The strip discone antennas are lighter in weight and suited for applications in high frequency (HF) and very high frequency (VHF) bands.

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

Creation

Description

example

ant = disconeStrip creates a strip discone antenna with dimensions for a resonant frequency of 147.38 MHz. The default strip discone antenna has a feedpoint at the center of the disc.

example

ant = disconeStrip(Name,Value) sets Properties using name-value pairs. For example, disconeStrip('NumStrips',8) creates a discone strip antenna with eight strips. You can specify multiple name-value pairs. Enclose each property name in quotes. Properties not specified retain their default values.

Properties

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Number of strips to form the cone and the disc, specified as a scalar in the range [6, 64]. The number of strips can be increased to increase the impedance bandwidth of the disconeStrip antenna object.

Example: 'NumStrips',8

Example: ant.NumStrips = 14

Data Types: double

Width of each strip in the strip discone antenna, specified as a scalar in meters.

Example: 'StripWidth',10e-3

Example: ant.StripWidth = 15.8e-3

Data Types: double

Vertical height between the maximum or broad diameter and the minimum or narrow diameter of the cone, specified as a scalar in meters. The vertical height can be decreased to increase the operating frequency.

Example: 'Height',1.59

Example: ant.Height = 1.89

Data Types: double

Radii of the cone, specified as a two-element vector in meters. In the two element vector, the first element specifies the narrow or minimum radius and second element specifies the broad or maximum radius of the cone. The radii of the cone can be decreased to increase the operating frequency and high-frequency input impedance.

Example: 'ConeRadii',[63e-3 840e-3]

Example: ant.ConeRadii = [65e-3 910e-3]

Data Types: double

Radius of the disc, specified as a scalar in meters. The radius of the disc can be decreased to increase the operating frequency and it can be increased to increase the low-frequency input impedance.

Note

DiscRadius should be smaller than the ConeRadii.

Example: 'DiscRadius',900e-3

Example: ant.DiscRadius = 829e-3

Data Types: double

Gap between the cone and the disc, specified as a scalar in meters. This gap represents height of the field and the gap can be decreased to increase the high-frequency input impedance.

Example: 'FeedHeight',34e-3

Example: ant.FeedHeight = 34e-3

Data Types: double

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

Example: 'FeedWidth',25e-3

Example: ant.FeedWidth = 21e-3

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 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',lumpedelements, where lumpedelements is the load added to the antenna feed.

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: 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.

Note

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

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'

Note

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

Data Types: double

Object Functions

coneangle2sizeCalculates equivalent cone height, broad radius, and narrow radius for cone
showDisplay antenna or array structure; display shape as filled patch
impedanceInput impedance of antenna; scan impedance of array
sparametersCalculate S-parameter for antenna and antenna array objects
returnLossReturn loss of antenna; scan return loss of array
vswrVoltage standing wave ratio of antenna
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
axialRatioAxial ratio of antenna
beamwidthBeamwidth of antenna
currentCurrent distribution on metal or dielectric antenna or array surface
chargeCharge distribution on metal or dielectric antenna or array surface
efficiencyRadiation efficiency of antenna
EHfieldsElectric and magnetic fields of antennas; Embedded electric and magnetic fields of antenna element in arrays
meshMesh properties of metal or dielectric antenna or array structure
meshconfigChange mesh mode of antenna structure
optimizeOptimize antenna or array using SADEA optimizer
designDesign prototype antenna or arrays for resonance around specified frequency
rcsCalculate and plot radar cross section (RCS) of platform, antenna, or array

Examples

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Create and view a strip discone antenna with default properties.

ant = disconeStrip;
show(ant)

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

Plot the radiation pattern of the antenna at 147.38 MHz.

pattern(ant, 147.38e6)

Figure contains an axes object and other objects of type uicontrol. The axes object contains 7 objects of type patch, surface.

Create and view a strip discone antenna object with the specifed properties.

ant = disconeStrip('Height',92e-3,'ConeRadii',[5.5e-3 53e-3],'DiscRadius', 37e-3,'NumStrip',16,...
    'StripWidth',1e-3,'FeedWidth',0.5e-3,'FeedHeight',2.2e-3);
show(ant)

Figure contains an axes object. The axes object with title disconeStrip 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 500 MHz to 5 GHz.

s = sparameters(ant,linspace(500e6,5e9,101));
figure
rfplot(s)

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

More About

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References

[1] Khumanthem.T., C.Sairam, S.D.Ahirwar and M.Balachary. ''Compact Discone Antenna with Small Form Factor in VHF Band'' EWCI, 2014.

[2] Ki-Hak Kim, Jin-U Kim, and Seong-Ook Park. “An Ultrawide-Band Double Discone Antenna with the Tapered Cylindrical Wires.” IEEE Transactions on Antennas and Propagation 53, no. 10 (October 2005): 3403–6. https://doi.org/10.1109/TAP.2005.856036.

[3] Tai C-T. and S. A. Long. ''Dipoles and Monopoles'' in Antenna Engineering Handbook, 4th ed., J. L. Volakis (Ed.), McGraw-Hill, 2007.

[4] McDonald, James L., and Dejan S. Filipovic. “On the Bandwidth of Monocone Antennas.” IEEE Transactions on Antennas and Propagation 56, no. 4 (April 2008): 1196–1201. https://doi.org/10.1109/TAP.2008.919226.

Introduced in R2020b