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The following trace is an example of an antenna return loss trace.
Calculate the threshold value and compare the recorded Lowest Return Loss to the calcu-
lated threshold value.
Maximum Return Loss =
()
()
--
+
20 1
1
log VSWR
VSWR
NOTE: VSWR is the antenna manufacturer’s specified VSWR.
If the measured return loss is less than the calculated threshold value, the test fails and the
antenna must be replaced.
Chapter 4 Measurements
4-11
Figure 4-6. Antenna Return Loss Trace