X3C25F1-02S Datasheet, PDF (6/18 Pages) Anaren Microwave – High Isolation

Model X3C25F1-02S
Rev D
Definition of Measured Specifications
Parameter
VSWR
(Voltage Standing Wave
Ratio)
Return Loss
Insertion Loss
Directivity
Phase Balance
Mean Coupling
Group Delay
Definition
The impedance match of
the coupler to a 50
system. A VSWR of 1:1 is
optimal.
The impedance match of
the coupler to a 50
system. Return Loss is
an alternate means to
express VSWR.
The input power divided
by the sum of the power
at the two output ports.
The power at the coupled
port divided by the power
at the isolated port.
The difference in phase
angle between the two
output ports.
At a given frequency (_n),
coupling is the input
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.
Group delay is average
of group delay’s from
input port to the coupled
port
Mathematical Representation
V max
VSWR =
Vmin
Vmax = voltage maxima of a standing wave
Vmin = voltage minima of a standing wave
VSWR 1
Return Loss (dB)= 20log
VSWR -1
Pin
Insertion Loss(dB)= 10log
P P cpl  direct
Pcpl
10log
Piso
Phase at coupled port – Phase at direct port
Coupling
(dB)
=
C(_n )
 10log_{}
P_in (_n ) _
P_cpl (_n ) ^
N
 ^C(n ⁾
Mean Coupling (dB) = ^n1
N
Average ( GD-C)
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