Title :
New cross-coupled filter design using improved hairpin resonators
Author :
Lee, Sheng-Yuan ; Tsai, Chih-Ming
Author_Institution :
Dept. of Electr. Eng., Nat. Cheng Kung Univ., Tainan, Taiwan
fDate :
12/1/2000 12:00:00 AM
Abstract :
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
Keywords :
coupled transmission lines; elliptic filters; microwave filters; poles and zeros; resonator filters; cross-coupled filter design; even-mode resonance; feed structure; filter response; hairpin resonators; network model; odd-mode resonance; out-of-band rejection; passband; resonant frequencies; selectivity; size; spurious response; stepped-impedance resonators; transmission zeros; Circuit topology; Equations; Feeds; Filtering theory; Microwave circuits; Microwave filters; Passband; Resonance; Resonant frequency; Resonator filters;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
