[SI-LIST] Re: (No Date: Tue, 17 Feb 2009 09:34:35 -0800

Hi, Linda:

I think you should find out whether your antenna and PCB are single-ended or
differential. If it is differential like a dipole type of antennas, you
should connect one terminal of the antenna to ANT and the other one to
ANT_GND. If it is a single ended antenna, I believe you should connect the
second terminal of the antenna to GND. However, you should make sure both
the antenna and the PCB match. 

Regards,

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Jian X. Zheng, Ph.D.
Zeland Software, Inc.
48834 Kato Road, 103A, Fremont, CA 94538, U.S.A.
Tel: 510-623-7162, Fax: 510-623-7135, www.zeland.com
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-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
Behalf Of Tang, Linda (Xin Cai)
Sent: Monday, February 16, 2009 5:35 PM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] 

Hi, all,
I am working on an antenna.

I met a problem as below:

At the connector, there are three signals:

ANT: antenna signal (50R)

ANT_GND: antenna ground

GND: the whole PCB ground

Which ground plane should be the reference ground plane for the 50R
impedance calculation?

My PCB is 8 layers. The mirror area of the reference ground on all
layers should be the reference ground plane, yes or not?



Best regards

Linda Tang




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