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Rev A
Definition of Measured Specifications
Parameter Definition
Mathematical Representation
i, j, k, m is denoted as the port index of input, isolated, direct
and coupled port for specific pin configuration shown in the
table above
Return Loss
The impedance match of the
coupler to a 50Ω system. Return
Loss is an alternate means to
express VSWR.
10
ii
S
Directivity
The power at the isolated port
divided by the power at the
coupled port
10
20 log
Insertion Loss
The input power divided by the
sum of the power at the two output
ports.
10
mi ki
S S+
Mean Coupling
At a given frequency (
),
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.
Coupling (dB) =
10
20 log
Mean Coupling (dB) =
10
1
20log
N
m
=
∑
Phase Balance
The difference in phase angle
between the two output ports.
ki mi
S S∠ − ∠ +
Frequency
sensitivity
The decibel difference between
the maximum in band coupling
value and the minimum in band
coupling value.
(Max Coupling (dB) – Min Coupling (dB) )/2
