Hi Orin,
I believe they can make a difference, I'm not sure they wouldn't make EMC worse
in some cases. Do we have data showing they improve EMC performance, and when?
Can you point me towards any studies on their effectiveness, especially one
that explains how they don't become resonant structures when the shield is only
stitched to ground at the endpoints?
Suresh - I'm afraid your response came in garbled, probably an e-mail setting
(SI-list only accepts plain text).
Thanks,
Jeff Loyer
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On ;
Behalf Of Orin Laney
Sent: Thursday, October 26, 2017 5:55 PM
To: dmarc-noreply@xxxxxxxxxxxxx; istvan.novak@xxxxxxxxxxx; si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: Why do flex circuits need shields?
Signal-wise, maybe not. EMC-wise, they can make a difference.
Orin
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On ;
Behalf Of Loyer, Jeff (Redacted sender "jwloyer" for DMARC)
Sent: Thursday, October 26, 2017 3:08 PM
To: istvan.novak@xxxxxxxxxxx; si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: Why do flex circuits need shields?
Hi Istvan,
It's common for flex designs to have a metal layer above (and/or below) the
design as a "shield" (google "flex circuit shield"). These are separate from
the reference planes and, as Scott said, generally only grounded at their ends.
I'm trying to understand if they serve any real purpose.
Jeff Loyer
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On ;
Behalf Of Istvan Novak
Sent: Wednesday, October 25, 2017 3:56 PM
To: dmarc-noreply@xxxxxxxxxxxxx; si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: Why do flex circuits need shields?
Jeff,
What do you mean by shield? Co-planar grounded traces or an overall
wrap-around shield?
Regards,
Istvan Novak
Oracle
On 10/25/2017 3:06 PM, Loyer, Jeff (Redacted sender jwloyer for DMARC)
wrote:
Can someone explain why shields are so common on flex designs? What is
fundamentally different such that shields are needed on a microstrip flex
design but not a microstrip rigid design?
Jeff Loyer
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