X3C21P1-03S Datasheet, PDF (6/26 Pages) Anaren Microwave – Hybrid Coupler 3 dB, 90

Model X3C21P1-03S
Rev C
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
Insertion Loss
Isolation
Phase Balance
The impedance match of
the coupler to a 50Ω
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 input power divided
by the power at the
isolated port.
The difference in phase
angle between the two
output ports.
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
Pin
Insertion Loss(dB)= 10log
P P cpl + direct
P in
Isolation(dB)= 10log
Piso
Phase at coupled port – Phase at direct port
Amplitude Balance
The power at each output
divided by the average
power of the two outputs.
Pcpl
Pdirect
10log _{ Pcpl + Pdirect } and 10log _{ Pcpl + Pdirect }
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