RE: [SI-LIST] : Inner vs. Outer Layer Routing

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From: sweir (weirsp@a.crl.com)
Date: Tue Dec 21 1999 - 11:19:10 PST


Jian,

I believe that the need for reflection plane to reflection plane vias
proximate to high speed signal vias is the same for microstrip as it is for
stripline.

Regards,

Steve.

At 12:57 PM 12/21/99 -0800, you wrote:
>Hi, everybody:
>
>Microstrip and stripline have their own advantage. Stripline normally has
>less inductance and less dispersion. However, 3D interconnect in stripline
>may create very strong radiation. Some person mentioned that stripline
>radiates less. Such a conclusion is true when you have only the horizontal
>straight lines or horizontal bends. However, if you have vertical
>interconnects in a stripline circuit, the vertical interconnects may create
>very strong radiation. It is the so-called parallel plate mode, and this
>mode does not have any cut off frequency. Normally, microwave designers use
>shorting pin between the two ground planes at the proximity of 3D
>interconnects to suppress the parallel plate mode. Thanks!
>
>Best regards,
>
>----------------------------------------------------------------------------
>------------
>Jian-X. Zheng, Ph.D
>Zeland Software, Inc., 39676 Mission Blvd., Fremont, CA 94539, U.S.A.
>Tel: 510-797-8109, Fax: 510-797-8241, Web: http://www.zeland.com
>----------------------------------------------------------------------------
>------------
> >
>
>
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