[SI-LIST] Re: Coax vs. Microstrip

Siva,
While working for Lucent Technologies, I modeled a lot of SMA to PCB
interfaces.  I always found it important to include a portion of the lower
coaxial structure of the connector, any standoff from the board, etc.  If
possible, I used real center conductor and outer conductor dimensions and
correct dielectric constant.  If not readily available, I would substitute
measured center conductor dimensions, PTFE dielectric constant (~2.2) and
outer conductor diameter to yield 50 Ohms.

Hope this helps.
Eric
----- Original Message -----
From: "SS" <cacofonix98@xxxxxxxxx>
To: <si-list@xxxxxxxxxxxxx>
Sent: Tuesday, March 25, 2003 1:26 PM
Subject: [SI-LIST] Coax vs. Microstrip


>
> Hello,
>
> I am trying to model the SMA to PCB launch interface
> in a "popular tool".
> I am making a couple of simplifications
> 1) modeling only the part of the SMA that is embedded
> in the PCB.
> 2) Launch into the center conductor through a 50 ohm
> microstrip structure.
>
> Are these simplifications realistic or valid? If not,
> how far off from reality is it compared to a coaxial
> launch?
>
> Thanks
> Siva
>
>
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