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phased.ShortDipoleAntennaElement System object

Package: phased

Short-dipole antenna element

Description

The phased.ShortDipoleAntennaElement object models a short-dipole antenna element. A short-dipole antenna is a center-fed length wire whose length is much shorter than a wavelength. This antenna object only supports polarized fields.

To compute the response of the antenna element for specified directions:

  1. Define and set up your short-dipole antenna element. See Construction .

  2. Call step to compute the antenna response according to the properties of phased.ShortDipoleAntennaElement. The behavior of step is specific to each object in the toolbox.

Construction

h = phased.ShortDipoleAntennaElement creates the system object, h, to model a short-dipole antenna element.

h = phased.ShortDipoleAntennaElement(Name,Value) creates the system object, h, with each specified property Name set to the specified Value. You can specify additional name-value pair arguments in any order as (Name1,Value1,...,NameN,ValueN).

Properties

FrequencyRange

Antenna operating frequency range

Antenna operating frequency range specified as a 1-by-2 row vector in the form of [LowerBound HigherBound]. This vector defines the frequency range over which the antenna has a response. The antenna element has no response outside the specified frequency range.

Default: [0 1e20]

AxisDirection

Dipole axis direction

Dipole axis direction specified as one of 'Y' or 'Z'. This axis defines the direction of the dipole current with respect to the local coordinate system. In this coordinate system, the x-axis corresponds to the boresight direction. Two dipole axis directions are allowed: 'Y' specifies a horizontal dipole and 'Z' specifies a vertical dipole in the local coordinate system.

Default: 'Z'

Methods

cloneCreate short-dipole antenna object with same property values
getNumInputsNumber of expected inputs to step method
getNumOutputsNumber of outputs from step method
isLockedLocked status for input attributes and nontunable properties
isPolarizationCapablePolarization capability
plotResponsePlot response pattern of antenna
releaseAllow property value and input characteristics changes
stepOutput response of antenna element

Examples

expand all

Short-dipole Antenna Aligned Along the Y-Axis

Specify a short-dipole antenna with its dipole oriented along the y-axis. Then, plot the 3-D responses for both the horizontal and vertical polarizations.

h1 = phased.ShortDipoleAntennaElement(...
    'FrequencyRange',[100e6,600e6],'AxisDirection','Y');
fc = 250e6;
figure;
plotResponse(h1,fc,'Format','Polar',...
    'RespCut','3D','Polarization','H');
figure;
plotResponse(h1,fc,'Format','Polar',...
    'RespCut','3D','Polarization','V');
figure;
plotResponse(h1,fc,'Format','Polar',...
    'RespCut','3D','Polarization','C');

This figure shows the horizontal polarization response.

This figure shows the vertical polarization response.

This combined response best illustrates the polarity of the short-dipole.

Algorithms

The total response of a short-dipole antenna element is a combination of its frequency response and spatial response. This System object™ calculates both responses using nearest neighbor interpolation and then multiplies the responses to form the total response.

References

[1] Mott, H., Antennas for Radar and Communications, John Wiley & Sons, 1992.

See Also

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