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I simulated a DGS structure with FIDELITY, a time-domain solver also from Zeland, and obtained a good agreement with the measured results. Please see the attached picture. The structure details can be found on:
IEEE Microwave and Wireless Components Letters, <A Novel Frequency Doubler Using...
DGS stands for Defected Ground Structure. By etching ground plane with a certain pattern, the strip lines or metal traces on the substrate can show bandstop/bandpass features.
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