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theory for PCB resonator with special kind of mode

yefj

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Hello ,I have built a resonator in CST as shown bellow .
I need to make the resonator be in such mode so the H-field will be normal to PCB plane.(W diection in the photo).
Surface shows two peaks.
As you can see I have peak magnetic field at the edges.
Is there some PCB way to excite magnetic field peak in the middle of the ring in the direction of W(normal to PCB plane)?
Thanks.
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