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A balanced bandpass filter with high common-mode (CM) suppression using isosceles right-angled triangular (RAT) resonator is proposed in this Letter. The two high order orthogonal modes (TM210 Z and TM200 Z) are generated in the two overlapped isosceles RAT resonators under differential-mode (DM) and CM excitation, respectively. In this structure, TM210 Z mode will be transmitted and TM200 Z mode will be blocked. Furthermore, four via-holes are introduced to disturb TM210 Z mode while TM200 Z mode is unaffected, in order to shift the DM passband to the position of CM suppression. The designed balanced bandpass filter operating at 6.12 GHz with 3 dB fractional bandwidth of 5% is fabricated and measured. The measured and simulated results match very well with each other validating the feasibility of the proposed design concept.
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High common-mode suppression balanced bandpass filter using isosceles right-angled triangular resonator