X3C19P2-30S Datasheet, PDF (6/22 Pages) Anaren Microwave – 30 dB Directional Coupler

Model X3C19P2-30S
Rev B
Definition of Measured Specifications
Parameter
Definition
VSWR
(Voltage Standing Wave Ratio)
The impedance match of
the coupler to a 50
system. A VSWR of 1:1 is
optimal.
Return Loss
Mean Coupling
Insertion Loss
Transmission Loss
Directivity
Frequency Sensitivity
The impedance match of
the coupler to a 50
system. Return Loss is
an alternate means to
express VSWR.
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.
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.
The power at the
coupled port divided by
the power at the isolated
port.
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.
Mathematical Representation
VSWR = ^Vmax
Vmin
Vmax = voltage maxima of a standing wave
Vmin = voltage minima of a standing wave
Return Loss (dB)= 20log ^{VSWR  1}
VSWR -1
Coupling
(dB)
=
C(_n )
 10log_{}
P_in (_n ) _
P_cpl (_n ) ^
N
 ^C(n ⁾
Mean Coupling (dB) = ^n1
N
10log
Pin
P P cpl  direct
10log ^Pin
Pdirect
10log ^Pcpl
Piso
Max Coupling (dB) – Mean Coupling (dB)
and
Min Coupling (dB) – Mean Coupling (dB)
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