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Compact high‐selectivity bandpass filter using a novel uniform coupled‐line dual‐mode resonator
Author(s) -
Wu Yongle,
Hu Binxuan,
Nan Lixia,
Liu Yuanan
Publication year - 2015
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.29336
Subject(s) - resonator , band pass filter , narrowband , microwave , microstrip , transmission line , dual mode , filter (signal processing) , frequency selectivity , dielectric resonator , resonance (particle physics) , physics , electronic engineering , optoelectronics , materials science , acoustics , optics , engineering , electrical engineering , telecommunications , atomic physics
Based on a single and uniform coupled‐line section, a novel and simple dual‐mode resonator with a wide range of external quality factor is proposed. The even‐ and odd‐mode (dual‐mode) resonance frequencies are created from unequal effective dielectric constants of a single coupled line. The operating principle is explained, and simulated examples are illustrated. Finally, a microstrip narrowband (14%) dual‐mode high‐selectivity bandpass filter operating at 2.6 GHz with two transmission zeros (2.02 and 2.97 GHz) is designed, fabricated, and measured. The good agreement between the simulated and measured results verifies this proposed idea. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:2355–2358, 2015