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A new approach for designing the single-band and dual-band balanced bandpassfilters (BPFs) based on the circular patch resonator is proposed in this work.By modifying the output balanced ports of the balanced BPFs to inhibit ortransport TM31 mode of the circular patch resonator under the differential-mode(DM) excitation, a single-band or dual-band balanced BPF can realized. As theodd modes could be restrained under the common-mode (CM) excitation, thebalanced BPFs could achieve high CM suppression in the DM passbands. Meanwhile,several perturbing ways are introduced to improve the performance of thebalanced BPFs. Specifically, perturbation vias are introduced to disturb theelectric field distribution to improve the CM suppression in the DM passbands,and slots are cut on the circular patch resonators to perturb the currentdistribution to modify the second DM passband of the dual-band balanced BPF.Furthermore, the proposed single-band and dual-band balanced BPFs arefabricated and characterized. Good agreement can be achieved between thesimulated and measured results of the fabricated balanced BPFs, which validatesthe feasibility of the proposed design method.

Novel Balanced Single/Dual-band Bandpass Filters Based on Circular Patch Resonator