Re: grounded co-planar waveguide PCB design advice please
- From: "tlbs" <tlbs101@xxxxxxxxxx>
- Date: 10 Mar 2006 08:44:10 -0800
megoodsen wrote:
Hi,
I'm designing an RF multilayer board that is to work over 10-200MHz.
For the transmission line I'm using grounded co-planar waveguide.
Material is 10 thou Rogers 4350B, with a 50ohm track width of 0.46mm
and a track to top ground gap of 0.146mm.
This is working OK.
I now want to shield the board to prevent crosstalk, but I am
restricted to very little height.
My plan is to get a flat plate of say 1mm material half mm deep etched
with pockets that follow the RF lines and is grounded all elsewhere.
My worry is, will the fairly close proximity (but nearly 4 times the
track to gnd distance) of the metal plate above the transmission lines
cause problems, and/or will I have resonating cavities too?
I can make the cavities be 3 or 4 times wider that the gnd to gnd gap
around the lines if need be.
What do you think?
I designed a multilayer (20 MHz to 1 GHz wideband + digital ECL) RF
board a few years ago using Rodgers material. I just buried the RF
traces on layer 2 under a surface ground plane and a composite
power/ground layer 3.
Even then, there were a few surface layer traces necessary, and they
got covered by a small shielded can. That probably doesn't help you
much. Perhaps there is some portion of the board where the height
requirement isn't so strict. You could place some surface mount
components in that area and cover them.
Good luck,
Tom
.
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- grounded co-planar waveguide PCB design advice please
- From: megoodsen
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