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New cross-coupled filter design using improved hairpin resonators

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2 Author(s)
Sheng-Yuan Lee ; Dept. of Electr. Eng., Nat. Cheng Kung Univ., Tainan, Taiwan ; Chih-Ming Tsai

Stepped-impedance resonators have been thoroughly studied in this paper. Two equations for odd- and even-mode resonance are derived from a new network model. The size and resonant frequencies of the resonator could then be designed based on these two equations. A new resonator-embedded cross-coupled filter, constructed by stepped-impedance hairpin resonators and miniaturized hairpin resonators is presented. This new filter is very compact and has lower spurious response. A 0° feed structure, which adds two transmission zeros to the filter response, is also studied. The two zeros are so close to the passband that the selectivity and out-of-band rejection of the filter are significantly increased. The design has been verified by experiment results

Published in:

IEEE Transactions on Microwave Theory and Techniques  (Volume:48 ,  Issue: 12 )