X3C19P1-05S Datasheet, PDF (6/22 Pages) Anaren Microwave – 5dB Directional Coupler

Model X3C19P1-05S
Rev B
Definition of Measured Specifications
Parameter
Definition
VSWR
(Voltage Standing Wave Ratio)
The impedance match of
the coupler to a 50Ω
system. A VSWR of 1:1 is
optimal.
Return Loss
Mean Coupling
Insertion Loss
Directivity
Phase Balance
Frequency Sensitivity
The impedance match of
the coupler to a 50Ω
system. Return Loss is
an alternate means to
express VSWR.
At a given frequency (ω_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 power at the coupled
port divided by the power
at the isolated port.
The difference in phase
angle between the two
output ports.
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
Vmax
VSWR =
Vmin
Vmax = voltage maxima of a standing wave
Vmin = voltage minima of a standing wave
VSWR + 1
Return Loss (dB)= 20log
VSWR -1
Coupling
(dB)
=
C(ω_n )
= 10 log_{}
P_in (ω_n )
P_cpl (ω_n )

∑^N
C(ω_n )
Mean Coupling (dB) = ⁿ⁼¹
N
Pin
10log
P P cpl + direct
P cpl
10log
Piso
Phase at coupled port – Phase at direct port
Max Coupling (dB) – Mean Coupling (dB)
and
Min Coupling (dB) – Mean Coupling (dB)
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