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axialRatio

Axial ratio of antenna

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Syntax

axialRatio(antenna,frequency,azimuth,elevation)
ar = axialRatio(antenna,frequency,azimuth,elevation)

Description

example

axialRatio(antenna,frequency,azimuth,elevation) plots axial ratio of an antenna over a specified frequency, and in the direction specified by azimuth and elevation. Any one among frequency, azimuth, or elevation values must be scalar. If only one of the values are scalar, the plot is 3-D. If two values are scalar, the plot is 2-D.

example

ar = axialRatio(antenna,frequency,azimuth,elevation) returns the axial ratio of an antenna, over the specified frequency, and in the direction specified by azimuth and elevation.

Examples

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Open Live Script

Calculate the axial ratio of an equiangular spiral antenna at azimuth=0 and elevation=0.

s  = spiralEquiangular;
ar = axialRatio(s,3e9,0,0)
ar = Inf
Open Live Script

Create a cloverleaf antenna.

cl = cloverleaf;
show(cl);

Figure contains an axes object. The axes object with title cloverleaf antenna element, xlabel x (mm), ylabel y (mm) contains 10 objects of type patch, surface. These objects represent PEC, feed.

Plot the axial ratio of the antenna from 5 GHz to 6 GHz.

freq = linspace(5e9,6e9,101);
axialRatio(cl,freq,0,0);

Figure contains an axes object. The axes object with title Axial ratio, xlabel Frequency (GHz), ylabel Axial ratio (dB) contains an object of type line.

The axial ratio plot shows that the antenna supports circular polarization over the entire frequency range.

Input Arguments

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Antenna object, specified as an object.

Frequency used to calculate axial ratio, specified as a scalar or vector with each element in Hz.

Example: 70e6

Data Types: double

Azimuth angle of antenna, specified as a scalar or vector with each element in degrees.

Example: 0

Data Types: double

Elevation angle of antenna, specified as a scalar or vector with each element in degrees.

Example: 0

Data Types: double

Output Arguments

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Axial ratio of antenna, returned as a scalar in dB.

Version History

Introduced in R2015a

See Also

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