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Compact dual‐ and triband bandpass filter using frequency selecting coupling structure loaded stepped‐impedance resonator
Author(s) -
Xu Jin,
Zhang JinDong
Publication year - 2015
Publication title -
international journal of rf and microwave computer‐aided engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.335
H-Index - 39
eISSN - 1099-047X
pISSN - 1096-4290
DOI - 10.1002/mmce.20877
Subject(s) - resonator , band pass filter , stopband , return loss , insertion loss , microwave , electrical impedance , multi band device , materials science , coupling (piping) , passband , electronic engineering , optoelectronics , physics , acoustics , electrical engineering , engineering , telecommunications , composite material , antenna (radio)
This article presents two novel resonators, that is, frequency selecting coupling structure loaded stepped‐impedance resonator (FSCSLSIR) and π‐section loaded FSCSLSIR. The resonator behaviors and guidelines are given to design FSCSLSIR dual‐band bandpass filter (BPF) and π‐section loaded FSCSLSIR triband BPF. The proposed dual‐ and triband BPF have very compact sizes of 0.13 λ gd × 0.06 λ gd and 0.115 λ gt × 0.074 λ gt , respectively. Moreover, good return loss, low insertion loss, and high band‐to‐band isolation can be observed, and the proposed FSCSLSIR dual‐band BPF has an ultrawide stopband from 5.79 to 36 GHz. The experimental results are in good agreement with the simulations. © 2014 Wiley Periodicals, Inc. Int J RF and Microwave CAE 25:427–435, 2015.