axialRatio

Calculate and plot axial ratio of antenna or array

Syntax

axialRatio(object,frequency,azimuth,elevation)

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

Description

axialRatio(object,frequency,azimuth,elevation) plots axial ratio of an antenna over a specified frequency 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.

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

Examples

Calculate Axial Ratio of Antenna

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

Axial Ratio of Cloverleaf Antenna

Create a cloverleaf antenna.

cl = cloverleaf;
show(cl);

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

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

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

Input Arguments

object — Antenna or array

antenna object | array object | custom 2-D mesh or geometry object | custom 2-D and 3-D antenna object | pcbStack object | installedAntenna object | planeWaveExcitation object

Antenna or array to calculate the axial ratio, specified as either of these objects:

• Antenna object from the antenna catalog.

• Array object from the array catalog.

• Custom 2-D mesh or geometry object.

• Custom 2-D and 3-D antenna object.

• pcbStack

• installedAntenna

• planeWaveExcitation

Example: dipole

Example: linearArray(Element=dipole)

frequency — Frequency to calculate axial ratio

scalar | vector

Frequency to calculate axial ratio, specified as a scalar for a single frequency or a vector for a frequency range in Hertz.

Example: 70e6

Data Types: double

azimuth — Azimuth angle to calculate axial ratio

numeric scalar | numeric vector

Azimuth angle to calculate the axial ratio, specified as a numeric scalar or vector in degrees.

Example: 0

Data Types: double

elevation — Elevation angle to calculate axial ratio

scalar in degrees | vector in degrees

Elevation angle to calculate the axial ratio, specified as a scalar or vector in degrees.

Example: 0

Data Types: double

Output Arguments

ar — Axial ratio of antenna or array

numeric scalar in dB

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

Version History

Introduced in R2015a