[SI-LIST] Re: CPW Board Launch
- From: Ed Sayre III <esayre3@xxxxxxxx>
- To: mmoeller@xxxxxxxxxxxxxxx
- Date: Wed, 06 Oct 2004 12:22:42 -0400
Mark,
Most PCB edge launch SMA's do not currently have the bandwidth to
support a 70GHz bandwidth. If you are truly serious, you will need to
utilize a tool like CST or Ansoft to fully model the SMA-PCB-trace
interface. This is non-trivial, it is not for the faint of heart. You are
asking for a design that only a few people in the world can do. This is
not something that "rules-of-thumb" can answer. You need expert help, or
the equivalent of your own time to learn the tools and how to deal with the
tool errors that will be evident at these frequencies. Lastly, what tool
would you use to measure something at 70GHz bandwidth? This again is non
trivial, the fixturing required to have a 70G bandwidth is very select or
totally custom.
Hope this doesn't scare you away.
Regards
-Ed Sayre
At 10:54 AM 10/6/2004 -0500, Moeller, Merrick wrote:
>Experts,
> I am looking for information regarding the design
>of a CPW launch for an edgemount coax connector. What
>are the best available resources for the design of CPW
>structures for testing, or otherwise?
> What are some of the considerations in the
>design of a CPW? Do's and Don'ts would be good. I would
>like to support frequencies up to 70GHz.
>Regards,
>Merrick M. Moeller
>
>
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NORTH EAST SYSTEMS ASSOCIATES, INC
-------------------------------------
"High Performance Engineering & Design"
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Dr. Edward Sayre 3rd e-mail: esayre3@xxxxxxxx
NESA, Inc. http://www.nesa.com/
5 Lan Drive, Suite 200 Tel +1.978.392-8787 x 218
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