Bird Technologies AT-800-Manual User Manual
Page 39
Measure Match
21
Rho
The ratio of reflected wave voltage to forward wave
voltage.
Note:
A perfect antenna would not have any
reflected waves and a 0.00 reflection coefficient.
VSWR
The ratio of maximum and minimum voltages on a
transmission line caused by the combination of a for-
ward and reflected wave.
Note:
For a perfect antenna the VSWR
would be 1:1 and shown as 1.00.
Match Efficiency (%)
Indicates how much of the transmitted power is being
used and how much is wasted.
Note:
A perfect antenna has a Match Effi-
ciency of 100%.
Return Loss (dB)
The ratio of the reflected and forward signal in deci-
bels. If the antenna system is perfectly matched, the
Return Loss would be negative infinity dB.
Note:
Cellular systems and antenna man-
ufacturers often use VSWR in specs.
Note:
Match Efficiency is popular for test-
ing because it is easy to determine a good
match versus a bad match.
Example - A system with a VSWR of 1.50
would show -13.98 dB Return Loss and 96%
Match Efficiency.