returnLoss

Return loss of antenna; scan return loss of array

Syntax

returnLoss(antenna,frequency)

returnLoss(antenna,frequency,z0)

rl = returnLoss(antenna,frequency,z0)

returnLoss(array,frequency,z0,elementnumber)

rl = returnLoss(array,frequency,z0,elementnumber)

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.

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

Calculate and Plot Return Loss of Antenna

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

antenna — Antenna object

scalar

Antenna object, specified as a scalar.

array — array object

scalar

Array object, specified as a scalar.

frequency — Frequency range used to calculate return loss

vector in Hz

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

Example: 50e6:1e6:100e6

Data Types: double

z0 — Reference impedance

50 (default) | scalar in ohms

Reference impedance, specified as a scalar in ohms.

Example: 40

Data Types: double

elementnumber — Antenna element number in array

scalar

Antenna element number in array, specified as a scalar.

Example: 1

Data Types: double

Output Arguments

rl — Return loss of antenna object or scan return loss of array object

vector in dB

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

$$RL=-20{\log }_{10}\left|\frac{(Z-Z_0)}{(Z+Z_0)}\right|$$

where,

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

• Z₀ = reference impedance