VSWR Return Loss Calculation, Formula, Example

VSWR Return Loss
VSWR Return Loss

VSWR Return Loss Calculator

Impedance mismatch/discontinuity between the transmission line/cable to the connected load/component results in a standing wave pattern along the transmission line, by which a small amount of incident signal power reflects back to the source. The return loss of a system is defined as the ratio of incident power to reflected power and is measured in dB. High return loss results in low reflected power, so high return loss is desirable for a system. VSWR means that the ratio of the maximum voltage to the minimum voltage in the standing wave pattern along the transmission line.

VSWR (Voltage Standing Wave Ratio) is the measure of how efficiently RF power is transmitted and is expressed as a ratio of the maximum to minimum amplitude (or the voltage or current) of the corresponding field components appearing on a line that feeds an antenna.

Return Loss (RL) is a amount of power that is lost to the load and returns back to the system as a reflection typically expressed in dB. A high return loss means more power is lost at the load.


VSWR Return Loss
VSWR Return Loss



RL = Return loss in dB

VSWR = Voltage standing wave ratio.


Let’s calculate Voltage standing wave ratio, consider Return loss = 5.

Lets apply


VSWR = 3.56977118

READ HERE  Capacitance, Reactance, and Admittance Calculation, Formula, Example


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