Model XC0450A-03
Rev B
Definition of Measured Specifications
Parameter
Definition
Mathematical Representation
V
max
The impedance match of
the coupler to a 50Ω
system. A VSWR of 1:1 is
optimal.
VSWR =
VSWR
(Voltage Standing Wave
Ratio)
V
min
Vmax = voltage maxima of a standing wave
Vmin = voltage minima of a standing wave
The impedance match of
the coupler to a 50Ω
system. Return Loss is
an alternate means to
express VSWR.
VSWR +1
VSWR -1
Return Loss
Return Loss (dB)= 20log
The input power divided
by the sum of the power
at the two output ports.
The input power divided
by the power at the
P
in
Insertion Loss(dB)= 10log
Isolation(dB)= 10log
Insertion Loss
Isolation
P
cpl +
P
direct
P
in
P
iso
isolated port.
The difference in phase
angle between the two
output ports.
Phase Balance
Phase at coupled port – Phase at direct port
P
cpl
P
direct
The power at each output
divided by the average
power of the two outputs.
10log
and 10log
P
cpl + Pdirect
P
cpl + Pdirect
Amplitude Balance
⎛
⎜
⎞
⎟
⎛
⎜
⎞
⎟
2
2
⎝
⎠
⎝
⎠
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ANAREN [ ANAREN MICROWAVE ]
