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November 10, 2011


Tony Stewart

Having designed raised floor computer rooms, multi-layer PCB' and VHF/UHV/uWave antenna, I don't see the loop as real. It doesn't follow that a ground plane offers lower impedance on the perimeter at any wavelength. If you consider stripline impedances, the design you proposed may reduce copper consumption for ground plane but at higher impedance. Perhaps adequate, but less absorption of stray EMI. My 2 cents.

Tony Stewart

Oops yes I see you did show a loop, not a ground plane.

there are 2 schools of thought;
a) centralized ground
b) distributed ground
central ground or looped grounds earthed at convenient points to plumbing..may be adequate for most apps.
In either case for EMP or EMI nothing beats a double walled faraday cage but a ground plane antenna with the lowest impedance depends on wavelength and since EMP is broadband, tbe best ground is a ground plane A distributed T link ground plane you proposed looks like a Yagi Antenna with gain.

There is no simple answer. It depends on what EMI/EMP you want to block. But my bet is copper or cheaper...aluminum mosquito mesh faraday cage or at least a ground plane, earthed at many points.

pcb prototype

Such a great and interesting post for me. Help me to give more better idea about it.


This is interesting

Is there proof of concept that actually works.

For me I seen many different solution and proposal but limited actual hard proof.

Should the top end of copper be broken to avoid current path?

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