Title :
Microstrip cascaded trisection filter with multiple pairs of transmission zeros
Author_Institution :
Dept. of Comput. & Commun. Eng., Tahwa Univ. of Sci. & Technol., Hsinchu, Taiwan
Abstract :
A novel cascaded trisection bandpass filter with multiple pairs of transmission zeros is proposed. In this circuit, each zero pair at real or imaginary frequencies is generated by a single trisection with resonant cross-coupling, i.e. mixed electric and magnetic coupling between non-adjacent resonators. This type of cross-coupling can be simply modeled by a J-inverter multiplied by the complex frequency variable s. Direct extraction of the element values of the lowpass equivalent circuit from the referred quasi-elliptic transfer function is developed. Microstrip resonators are designed to realize the resonant cross-coupling. Experimental filters are implemented and measured to validate the design.
Keywords :
invertors; microstrip filters; microstrip resonators; J-inverter; low-pass equivalent circuit; magnetic coupling; microstrip cascaded trisection bandpass filter; microstrip resonators; nonadjacent resonators; resonant cross-coupling; transmission zeros; Band pass filters; Couplings; Filtering theory; Microstrip filters; Microwave filters; Resonant frequency; Resonator filters; Cascaded trisection; cross-coupling; microstrip filters; transmission zeros;
Conference_Titel :
Microwave Conference Proceedings (APMC), 2012 Asia-Pacific
Conference_Location :
Kaohsiung
Print_ISBN :
978-1-4577-1330-9
Electronic_ISBN :
978-1-4577-1331-6
DOI :
10.1109/APMC.2012.6421554
