SWR vs. Return Loss — How Do You Interpret Them?
2026-09-03
VSWR and Return Loss often appear together in RF specifications. What do these two parameters actually tell us, and how should we interpret their values?
Both describe impedance matching and reflection, but from different perspectives.
VSWR describes the voltage standing-wave ratio, while Return Loss (RL) quantifies the ratio of reflected power to incident power, expressed in dB.
The key relationship:
Lower VSWR → Higher Return Loss → Lower Reflected Power → Better Matching
For example:
VSWR 1.5:1 = Return Loss 14 dB = 4% Reflected Power
In other words, 4% of the incident power is reflected back toward the source, while approximately 96% reaches the load.
Save this quick reference for your next RF measurement or amplifier design.
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