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Planes virginity under a patch antenna
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Koen:
Hello! In a 4-layer PCB with a ceramic patch antenna atop, is it useful to have the layer directly underneath the antenna as a virgin plane or can traces be routed ? To keep the usual signal/plane/plane/signal stack. Thank you!
T3sl4co1l:
Well, I don't know, I guess you could in some circumstances.  If you don't mind having a huge amount of RF coupled into those traces, and if you have some way to stitch the plane around the traces if they cover much length.

In other words, no, not even no, hell no. :-DD

Tim
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