# returnLoss

Return loss of antenna; 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);

## Input Arguments

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Antenna object, specified as a scalar.

Array object, specified as a scalar.

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

$RL=-20{\mathrm{log}}_{10}\text{ }\text{\hspace{0.17em}}|\frac{\left(Z-{Z}_{0}\right)}{\left(Z+{Z}_{0}\right)}|$

where,

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

• Z0 = reference impedance

## Version History

Introduced in R2015a