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Model X3C09E2-20S
Rev A
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.
? P in ( ω n ) ?
Coupling (dB) = C ( ω n ) = 10 log ?
? P ( ω ) ?
At a given frequency ( ω n ),
coupling is the input
power divided by the
power at the coupled
?
? cpl n ?
∑ C ( ω
Mean Coupling
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 (dB) =
N
n = 1
N
n
)
Insertion Loss
The input power divided
by the sum of the power
at the two output ports.
10log
P in
P cpl + P direct
Transmission Loss
Directivity
The input power divided
by the power at the direct
port.
The power at the
coupled port divided by
the power at the isolated
port.
10log
10log
P in
P direct
P cpl
P iso
The decibel difference
between the maximum in
Frequency Sensitivity
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)
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Manufacturing.
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