Whether there is a resonance or not depends upon whether you excite the
resonance at the via transitions. If you have a good ring of ground vias,
localizing the design, then you may not excite the resonance. But, you can also
inadvertently miss resonances that exist by using improper boundary conditions
at the edge of the planes. Make sure that you have an air box surrounding the
board, with space between the board and the edge of the board if you are using
a radiation boundary. Otherwise the radiation boundary will terminate any
energy on the planes.
Scott McMorrow, CTO Signal Integrity Group
Samtec
Office 401-284-1827 | +1-800-726-8329
www.samtec.com
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On ;
Behalf Of Juyoung Lee
Sent: Wednesday, July 12, 2017 5:04 PM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] ground plane resonance of stripline
Hi,
I am trying to build about 8 inch long stripline test structure.If there are no
ground vias stitched along the stripline except at end points, I can imagine
there would be resonances between the ground planes theoretically. If it
happens, would it appear as resonance dips in the insertion loss curve?
Or is it a myth that wouldn't happen in practice? When I tried simulations with
HFSS for 2 inch long stripline, I didn't see resonance in S21.
Regards,Juyoung Lee
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