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Operating Manual 1145.1084.12 – 30 379
For balanced non waveguide ports it is possible to define separate complex reference impedances for
differential and for common mode.
The default values for the balanced port reference impedances are derived from the default reference
impedance of the physical analyzer ports (Z
0
= 50 >Ω):
The default value for the differential mode is Z
0d
= 100 Ω = 2*Z
0
.
The default value for the common mode is Z
0c
= 25 Ω = Z
0
/2
Renormalization can be based on two alternative waveguide circuit theories. The conversion formula of
both theories differ only if the reference impedance of at least one test port has a non-zero imaginary part.
Conversion formula for wave quantities and S-parameters
Renormalization transforms the "raw" S-matrix S
0
for the default reference impedances Z
0i
(with physical
port number index i = 1, 2...n) into a "renormalized" S-matrix S
1
for the modified reference impedances Z
1i
.
In terms of raw and renormalized wave quantities a
0i
, b
0i
and a
1i
, b
1i
, S
0
and S
1
are defined as follows:
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