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returnLoss

Return loss of antenna or scan return loss of array

Description

returnLoss(antenna,frequency) calculates and plots the return loss of an antenna, over a specified frequency and at a reference impedance of 50 ohm.

example

returnLoss(antenna,frequency,z0) calculates and plots the return loss of an antenna, over a specified frequency and a given reference impedance, z0.

rl = returnLoss(antenna,frequency,z0) returns the return loss of an antenna.

returnLoss(array,frequency,z0,elementnumber) calculates and plots the scan return loss of a specified antenna element in an array.

rl = returnLoss(array,frequency,z0,elementnumber) returns the scan return loss of a specified antenna element in an array.

Examples

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This example shows how to calculate and plot the return loss of a circular loop antenna over a frequency range of 50MHz-100MHz.

h = loopCircular;
returnLoss (h, 50e6:1e6:100e6);

Figure contains an axes object. The axes object with title Return Loss, xlabel Frequency (MHz), ylabel Magnitude (dB) contains an object of type line.

Input Arguments

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Antenna to calculate return loss, specified as either:

Example: dipole

Example: customAntennaMesh

Example: customAntenna

Example: pcbStack

Array to calculate scan return loss, specified as either:

Example: linearArray

Example: customArrayGeometry

Example: array(pcbStack,"linear")

Frequency range used to calculate return loss, specified as a vector in Hz.

Example: 50e6:1e6:100e6

Data Types: double

Reference impedance, specified as a scalar in ohms.

Example: 40

Data Types: double

Antenna element number in array, specified as a scalar.

Example: 1

Data Types: double

Output Arguments

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Return loss of antenna or scan return loss of array, returned as a vector in dB. The return loss is calculated using the formula

RL=20log10|(ZZ0)(Z+Z0)|

where,

  • Z = input impedance of antenna or scan impedance of array

  • Z0 = reference impedance

Version History

Introduced in R2015a