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

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From: Jian Zheng (jian@zeland.com)
Date: Tue Dec 21 1999 - 12:57:38 PST


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,

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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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