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Model XC0900A-03
Rev C
Definition of Measured Specifications
Parameter
VSWR
(Voltage Standing Wave
Ratio)
Definition
The impedance match of
the coupler to a 50 Ω
system. A VSWR of 1:1 is
optimal.
The impedance match of
Mathematical Representation
V max
VSWR =
V min
Vmax = voltage maxima of a standing wave
Vmin = voltage minima of a standing wave
Return Loss
the coupler to a 50 Ω
system. Return Loss is
an alternate means to
Return Loss (dB)= 20log
VSWR + 1
VSWR - 1
express VSWR.
Insertion Loss
Isolation
The input power divided
by the sum of the power
at the two output ports.
The input power divided
by the power at the
isolated port.
Insertion Loss(dB)= 10log
Isolation(dB)= 10log
P in
P cpl + P direct
P in
P iso
The difference in phase
Phase Balance
angle between the two
output ports.
Phase at coupled port – Phase at direct port
? P cpl + P direct ?
? P cpl + P direct ?
Amplitude Balance
The power at each output
divided by the average
power of the two outputs.
10log
? ?
P cpl
? 2 ?
and 10log
? ?
P direct
? 2 ?
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Manufacturing.
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