Model XC0900A-20
Rev F
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 =
V
min
VSWR
Vmax = voltage maxima of a standing wave
Vmin = voltage minima of a standing wave
(Voltage Standing Wave Ratio)
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
At a given frequency (ωn),
coupling is the input
⎛
⎜
⎜
⎝
⎞
⎟
⎟
⎠
P (ωn )
in
Coupling (dB) =
C(ωn ) =10log
P (ωn )
cpl
power divided by the
power at the coupled
port. Mean coupling is
the average value of the
coupling values in the
band. N is the number of
frequencies in the band.
Mean Coupling
N
C(ω )
∑
n
n=1
Mean Coupling (dB) =
N
The input power divided
by the sum of the power
at the two output ports.
The input power divided
by the power at the direct
port.
P
in
10log
Insertion Loss
P
cpl +
P
direct
P
in
Transmission Loss
10log
10log
P
direct
The power at the
P
cpl
iso
coupled port divided by
the power at the isolated
port.
Directivity
P
The decibel difference
between the maximum in
band coupling value and
the mean coupling, and
the decibel difference
between the minimum in
band coupling value and
the mean coupling.
Max Coupling (dB) – Mean Coupling (dB)
and
Min Coupling (dB) – Mean Coupling (dB)
Frequency Sensitivity
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