Open AccessMiniature quad‐band bandpass filter with passband individually controllable using folded SIR
Author(s) -
Xiao JianKang,
Zhu YuFeng,
Li Yong,
Li XiWen
Publication year - 2014
Publication title -
electronics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.375
H-Index - 146
ISSN - 1350-911X
DOI - 10.1049/el.2014.0605
Subject(s) - passband , band pass filter , electronic engineering , prototype filter , filtering theory , materials science , computer science , filter (signal processing) , engineering , electrical engineering , low pass filter , algorithm
A novel quad‐band bandpass filter with individually controllable centre frequencies and bandwidths using a folded stepped‐impedance resonator (SIR) is proposed. The new filter that centres at 2.4, 3.3, 4.1 and 5.2 GHz has a measured passband insertion loss of no more than 1.6 dB, and has a miniature circuit size of 0.448 λ g × 0.027 λ g . The presented filter is fabricated and tested, and the experiment demonstrates the new design. The new quad‐band bandpass filter has compact and simple circuit topology, good performance of low passband insertion loss and transmission zeros, and greatly reduced circuit size compared with the relative reports.