8
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
L A B E L I T A L Y S R L
- V i a S . A l l e n d e , 5 9 – 4 1 1 2 2 M O D E N A
T E L : 0 5 9 / 3 6 2 9 9 3 F A X : 0 5 9 / 3 7 6 0 5 6
P . I V A 0 2 5 7 8 7 5 0 3 6 2 C a p i t a l e S o c i a l e 3 2 . 5 0 0 E u r o
w e b - w w w . l a b e l i t a l y . c o m e - m a i l - i n f o @ l a b e l i t a l y . c o m
RETURN LOSS - VSWR
When designing or building an electronic circuit using radio frequency elements the return loss is
of great importance as are the voltage standing wave ratio, and reflection coefficient for the signal.
This can be of great importance when using or designing RF equipment. While it is often
necessary to calculate the VSWR or return loss when undertaking RF design or maintaining or
using RF equipment it can sometimes be useful to convert between return loss, VSWR and voltage
reflection coefficient.
Return Loss (dB) is defined as a ratio of the incoming signal to the same reflected signal as it
enters a component. The Return Loss (RL) may also be explained as the difference between the
power of a transmitted signal and the power of the signal reflections caused by variations in link
and channel impedance. A return loss plot indicates how well the link and channel's impedance
matches its rated impedance over a range of frequencies. High return loss values mean a close
impedance match, which results in greater differentiation between the powers of transmitted and
reflected signals.
Table showing the conversion
between dbm, Voltage and
Power.
Table showing the conversion between VSWR and
return loss.