BS EN 61580-6:1997- Methods of measurement for waveguides - Part 6. Return loss on waveguide and waveguide assemblies
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This International Standard is applicable to the sweep frequency method used for the
measurement of return loss on waveguide and waveguide assemblies.
Return loss is defined as
ar = 20 log(ui/ur) dB
where
ยท ui is the magnitude of the incident wave;
. Ur is the magnitude of the reflected wave.
Return loss is related to the reflection coefficient, r, by:
r = (ur/ui)
r =10-(ar/20)
Fundamentally the method involves measuring the amplitude of the reflected wave at the
waveguide under test (WUT) input by means of a reflectometer device.
The reflected wave can be compared with the total reflected wave under short-circuit
conditions, attenuated by a calibrated attenuator, or it can be compared with the incident wave
by means of reflectometer.
