Open AccessShort‐ and open‐stub loaded spiral resonator and its application in planar microstrip filters
Author(s) -
Xu Kai Da,
Xu Han,
Liu Yanhui,
Ai Jing,
Liu Qing Huo
Publication year - 2017
Publication title -
iet microwaves, antennas and propagation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.555
H-Index - 69
eISSN - 1751-8733
pISSN - 1751-8725
DOI - 10.1049/iet-map.2016.0253
Subject(s) - stub (electronics) , band pass filter , resonator , microstrip , planar , spiral (railway) , acoustics , multi band device , passband , materials science , electronic engineering , physics , optoelectronics , optics , engineering , electrical engineering , computer science , mechanical engineering , computer graphics (images) , antenna (radio)
A novel short‐ and open‐stub loaded spiral resonator (SOSL‐SR) is presented and analysed by the odd‐ and even‐mode method to obtain three controllable resonant modes. Therefore, a triple‐mode bandpass filter (BPF) has been designed with good frequency selectivity based on the proposed SOSL‐SR. Then, by dividing these three resonant modes into two passbands or stopbands, a dual‐band BPF and a dual‐band bandstop filter using the proposed SOSL‐SR have been demonstrated. Because of the spiral structure, the sizes of these three designed microstrip filters are reduced significantly. Good agreement between simulated and measured results validates the design concept.