Premium
Compact dual‐band bandpass filter using spiral resonators and short‐circuited stub‐loaded resonator
Author(s) -
Song Kaijun,
Zhang Fan,
Zhuge Chunlin,
Fan Yong
Publication year - 2013
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.27589
Subject(s) - band pass filter , passband , resonator , stub (electronics) , multi band device , return loss , insertion loss , coupling coefficient of resonators , microwave , physics , materials science , optoelectronics , electronic engineering , acoustics , optics , electrical engineering , engineering , quantum mechanics , antenna (radio)
A compact dual‐band bandpass filter (BPF) using spiral resonators and short‐circuited stub‐loaded dual‐mode resonator is presented.Two different transmission paths and source‐load cross coupling are used to realize independently controllable bandwidths for each passband and good frequency selectivity. The coupling scheme and current distributions are applied to demonstrate the flexible design approach. A dual‐band BPF is designed, simulated, and fabricated to demonstrate the performance of the proposed dual‐band filter. The measured results show that the fabricated dual‐band BPF has two passbands centered at 2.45 and 3.55 GHz with the fractional bandwidths of 5 and 7%. The insertion loss is 1.2 and 1.3 dB at the lower and upper passbands, respectively, and the return loss within the two passbands is greater than 17 dB. The measured results show good agreement with the simulated ones. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:1393–1398, 2013; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27589