Design of a Compact and High Selectivity Tri-Band Bandpass Filter Using Asymmetric Stepped-impedance Resonators (SIRs)

In this article, a compact tri-band microstrip bandpass fllter (BPF) using asymmetric stepped-impedance resonators (SIRs) is proposed. Only one set of asymmetric SIRs are used in designing this fllter to achieve triple passband response with high selectivity and band-to-band isolation level. By properly selecting the impedance and electrical length ratios of the asymmetric SIRs, the tri-band BPF is designed. By using a cross-coupled conflguration and 0 - feed structure, high selectivity frequency responses with six transmission zeros are achieved. The three bands of the proposed tri-band fllter are located at 1.57/3.9/7GHz, respectively, and the circuit size is much smaller in comparison with previous works using the same substrate. Measured results are in good agreement with electromagnetic (EM) simulation.

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