Title :
Compact and high-isolation microstrip quadruplexer
Author :
Shih-Shan Lo ; Ko-Wen Hsu ; Wen-Hua Tu
Author_Institution :
Dept. of Electr. Eng., Nat. Central Univ., Jhongli, Taiwan
Abstract :
A microstrip quadruplexer with high isolation and compact size is proposed. The quadruplexer utilizes multimode resonators (MMRs), stepped-impedance resonators, and distributed coupling technique. In this proposed quadruplexer, the first and third passbands are excited in the odd modes of MMR, and the second and fourth passbands are of even modes of MMR. Then, with transmission zeros controlled, one can improve isolation. The quadruplexer occupies only a small area of 0.049λ02, and the isolation is better than 31 dB.
Keywords :
coupled circuits; isolation technology; microstrip circuits; resonators; MMR; compact high-isolation microstrip quadruplexer; distributed coupling technique; first passband quadruplexer; fourth passband quadruplexer; multimode resonator; second passband quadruplexer; stepped-impedance resonator; third passband quadruplexer; transmission zero control; Couplings; Filtering theory; Frequency measurement; Microwave filters; Passband; Ports (Computers); Resonant frequency; Isolation; multi-mode resonator; multiplexer;
Conference_Titel :
Microwave Conference Proceedings (APMC), 2013 Asia-Pacific
Conference_Location :
Seoul
DOI :
10.1109/APMC.2013.6694991
