Hello,
I'm simulating in my schematic an antenna whose representation in
based on s-parameters. I need to add in that schematic a matching
inductor whose model should be s-parameter based too. This inductor is
produced by Murata and I'would like to know if, in your opinion, is
possible to get the dataset of s-parameter for this component in
typical range of frequency. I visited their website but I'was not able
to find that data. Had someone did that before?

Camelot

Could you post the Murata part number? What data DO they have? If
they have complex impedance versus frequency, or apparent inductance
and Q versus frequency, or inductance, self-resonance, and Q versus
frequency, it should be nearly trivial to convert any of those to S11
versus frequency. Over at least a limited frequency range, you could
use RFSim99 to generate the S-parameter file from a model based on
inductance, Q and self resonance -- limited frequency range only
because you'll probably have a hard time getting the Q of the model to
match that of the inductor over a wide range.

Cheers,
Tom


On Jan 26, 2:19 am, "camelot" wrote:
Hello,
I'm simulating in my schematic an antenna whose representation in
based on s-parameters. I need to add in that schematic a matching
inductor whose model should be s-parameter based too. This inductor is
produced by Murata and I'would like to know if, in your opinion, is
possible to get the dataset of s-parameter for this component in
typical range of frequency. I visited their website but I'was not able
to find that data. Had someone did that before?

Camelot

Thank you Tom,
I'll take a look to RFSim99 tool in order to convert data availables
on the site like Q factor and impedence versus frequency.

Regards,

Camelot

On Jan 28, 10:47 pm, "camelot" wrote:
Thank you Tom,
I'll take a look to RFSim99 tool in order to convert data availables
on the site like Q factor and impedence versus frequency.

Regards,

Camelot

You would do well, too, to keep in mind that the data, especially for
unshielded inductors, is only an approximation. The inductance and
other parameters depend on exactly how you have mounted the part, and
what else is around it. If you expect things in the real world to
conform "exactly" to your model, you will be disappointed. You will
find, for example, that Q changes with temperature, as well as with
frequency, since the wire resistance changes with temperature. Expect
the Q to change about -0.2% per degree C, which may not sound like a
lot until you consider the effect of a 100C temperature rise, which
can happen in some equipment.

If you can use a vector network analyzer to actually measure one of
your parts (or even a set of them, to get statistical information),
that would be wonderful. Many modern VNAs will output an S-parameter
file that you can then use in various software for simulations and
modelling.

Be a little careful about RFSim99--though I recommend it, it does have
some problems in the area of saving and using S-parameter data. In
particular, it expects a particular format for input, and on output,
check carefully that the conversion was done correctly (something
about using 10log(ratio) instead of 20log(ratio) for dB magnitude...).

Cheers,
Tom

Thank you for the further suggestions ;-)

Giuseppe