R&S ZVB - Page 395

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Operating Manual 1145.1084.12 – 30 380
The renormalized wave quantities (a
1
and b
1
) and the S-matrix S
1
can be calculated from S
0
and the
reference impedances Z
0i
, Z
1i
.according to two alternative waveguide circuit theories.
1. Travelling waves
In the model of Marks and Williams ("A General Waveguide Circuit Theory"), the wave quantities a and b
are transformed as follows:
The renormalized S-matrix S
1
is calculated as
,
with the unit matrix E and two additional matrices with the elements
,
.
1. Power waves
In the model of Kurokawa ("Power Waves and the Scattering Matrix"), the wave quantities a and b are
transformed as follows:
The renormalized S-matrix S
1
is calculated as
,
with the unit matrix E and two additional matrices with the elements
,
.
In true differential mode, a renormalization formula for the balanced wave quantities is needed; refer to
section Wave Quantities and Ratios.
Remote control:
SENSe:PORT<phys_port>:ZREFerence <real> [,<imaginary]
SENSe:LPORT<log_port>:ZCOMmon <real> [,<imaginary]
SENSe:LPORT<log_port>:ZDIFferent <real> [,<imaginary]