====== RF Measurement Terms ======

[[https://www.everythingrf.com/tech-resources/vswr|SWR / Return Loss Conversion Table]]

Return Loss: $RL = 10 log_{10} \frac{P_{incident}}{P_{returned}}$
Always non-negative.

$S_{11}$: called reflection coefficient. Good: large negative number.

$RL = -S_{11}$

===== SWR =====

Can be calculated as ratio of impedances, e.g. source 50R, load 75R - 50:75 - SWR 1.5.