Title :
Extraction of electric and magnetic coupling for coupled symmetric microstrip resonator bandpass filter with tunable transmission zero
Author :
Tang, Shao-Chan ; Yu, Cheng-Hsuan ; Chiou, Yi-Chyun ; Kuo, Jen-Tsai
Author_Institution :
Dept. of Electr. Eng., Nat. Chiao Tung Univ., Hsinchu, Taiwan
Abstract :
An effective approach is demonstrated for extracting the electric and magnetic coupling components from the coupling coefficient between two coupled symmetric microstrip resonators. It is found that the extraction provides an extra degree of freedom for circuit design. A transmission zero near passband can be created without any cross-coupling scheme but by properly selecting the parameters of the resonators. An equivalent circuit is derived for characterizing the extraction of the coupling and control of the zero. Two experimental filters are realized and measured to validate the approach.
Keywords :
band-pass filters; coupled circuits; microstrip filters; microstrip resonators; coupled symmetric microstrip resonator bandpass filter; electric coupling; equivalent circuit; magnetic coupling; tunable transmission zero; Band pass filters; Circuit synthesis; Coupling circuits; Filtering theory; Magnetic separation; Microstrip components; Microstrip filters; Microstrip resonators; Passband; Tunable circuits and devices; Bandpass filter; electric coupling; magnetic coupling; mixed coupling; transmission zero;
Conference_Titel :
Microwave Conference, 2009. APMC 2009. Asia Pacific
Conference_Location :
Singapore
Print_ISBN :
978-1-4244-2801-4
Electronic_ISBN :
978-1-4244-2802-1
DOI :
10.1109/APMC.2009.5385304
