Abstract
A novel and compact multi-band stop filter with good selectivity and wide upper pass band performance with good rejection based on defected ground structure (DGS) integrating a circular ring resonator to suppress undesired spurious bands frequency or harmonics in microwave and millimeter wave circuits is proposed. The presented filter has a compact size because the circular ring resonator is integrated in DGS, the both of them are etching in the ground plane.
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