[SI-LIST] Re: Compact source

hello Mohamad,

When you say "compact source" I believe you may be referring to what
Flomerics called their near field excitations. The Flomerics EM business
unit was acquired by CST so you will want to contact CST  representatives to
discuss their continued support for what I believe they are calling
"Microstripes EMC".

When running a system-level full-PCB SI/PI analysis tool you can optionally
request a results file be written for the near fields (both E-fields and
H-fields) on a rectangular box enclosing the analysis geometry. This data
requires relatively little time to generate after the PCB analysis but is
not saved without specific request to avoid wasting disk space for those not
interested in EMC analysis. The data is frequency domain regardless of the
time/frequency domain nature of the tool that writes the data or the tool
that reads the data. Obviously, the fields at a specific frequency should be
weighted by the spectral content of the signals on the PCB at that frequency
- simple for a sinusoidal source, a bit more complex but still available for
non-time harmonic sources. The equivalence principle dictates you must have
at least the tangential fields on each face.

PowerSI and SPEED2000 from Sigrity (frequency/time domain full-PCB SI/PI
analysis, respectively) each export near field data for input to CST
Microstripes EMC (.esf format) and to CST Microwave Studio (.nfd format).
Such PCB-level data includes near fields from all microstrip lines on
top/bottom of the board. Power plane edge voltages (equivalent magnetic
currents) also contribute to these near fields. Striplines are shielded from
open radiation by upper and lower planes and will contribute to radiation
indirectly through power plane edge voltages. I believe these companies will
provide data format specifications openly with no restrictions.

I believe tools from SimLab can also produce near field based compact
sources for CST codes. I believe CST has chosen to leverage some of these
SimLab tools for PCB and cable applications.

Since the CST Microstripes EMC and CST Microwave Studio codes accept general
input fields you should even be able to simulate a small board with a 3D EM
simulator (fro example, with either of these two tools themselves), write
out the near fields, reformat to ESF/NFD format, and then read back in as a
so-called compact source.

I know Ansys HFSS can also read near field data but not in a general file
format and likely only from Ansys SIwave or from Ansys HFSS itself. I
believe reading SIwave data into HFSS requires an SIwave license, not just
the data file.

If you wish more detailed information or application examples, please
contact me directly.
There is at least one paper for the 2008 IEEE EMC Symp that will discuss
near field links between board SI/PI analysis and 3D EM analysis tools. It
is authored by Jin Shi (formerly Intel, now Sun Micro) and Jin Zhao
(formerly Sigrity, now Intel).

cheers,
 -Brad Brim
  bradb@xxxxxxxxxxx
 

> -----Original Message-----
> From: si-list-bounce@xxxxxxxxxxxxx
> [mailto:si-list-bounce@xxxxxxxxxxxxx] On Behalf Of Mohamad Haghtalab
> Sent: Thursday, August 07, 2008 10:41 AM
> To: si-list@xxxxxxxxxxxxx
> Subject: [SI-LIST] Compact source
> 
> Hi all
> ?
> for EMC simulation in System level we need compact source of radiation 
> from PCBs how can we get this through softwares like 
> HFSS,SIWAVE,CST,....?
> anyone has more information about compact source?
> ?
> Thanks for helping

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