Concepts and features
R&S
®
ZND
139
User Manual 1173.9557.02 ─ 61
The purpose of the keywords is to give more details about the file contents in a stand-
ardized way. During "Version 2.0" export, the R&S
ZND writes the following keywords
to the generated Touchstone file:
Keyword
Example
Description
[Version]
[Version] 2.0
Specification version, typically the first line in the file
Currently only
2.0
is allowed
[Number of Ports]
[Number of Ports] 2
The
n
in the generated
snp
file.
Except for the "s1p Active Trace" export,
n
equals the
number of physical ports involved in the export.
[Two-Port Data Order]
[Two-Port Data Order] 21_12
Specifies the data order in
s2p
files.
●
21_12
indicates data order
f N11 N21 N12 N22
●
12_21
indicates data order
f N11 N12 N21 N22
(see
The R&S
ZND generates
s2p
files with fixed data order
21_12
(according to the TS1.1 standard).
[Number of Frequencies]
[Number of Frequencies] 201
Number of exported frequency sweep points; can also
be derived from the
[Reference]
[Reference] 50 75
If the exported S-parameter data were renormalized
with port-specific impedances, the real parts of these
impedances are listed as arguments of the
[Reference]
keyword.
Overrides the common reference impedance of the
Note:
currently ignored during import
[Mixed-Mode Order]
[Mixed-Mode Order] D1,2 C1,2
Required if a balanced port is involved.
In the example to the left, nominal port 1 is the differen-
tial mode and nominal port 2 is the common mode of
balanced port (1,2).
Conveys the same information as the
[Network Data]
[Network Data] ! no args
block
[End]
[End] ! no args
Marks the end of the network parameter data section
and is typically placed in the last line of the export file
For details and more keywords, see the Touchstone File Format Specification Version
2.0 (
http://www.ibis.org/touchstone_ver2.0/touchstone_ver2_0.pdf
).
During import, the R&S
ZND currently only considers the
[Two-Port Data Order]
.
Network parameter data
The network parameter data section contains one block of network parameters per fre-
quency point. Each block is preceded by a frequency value, i.e. the first entry in the
Operations on traces
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