Premium
Dual‐wideband bandpass filter using multilayer broadside‐coupled structure
Author(s) -
Ji WuSheng,
Tong YingYun,
Zhang ZhiYue,
Dai Wei,
Li YaJing
Publication year - 2020
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.32477
Subject(s) - wideband , microstrip , band pass filter , stopband , resonator , broadside , bandwidth (computing) , coplanar waveguide , electronic engineering , acoustics , filter (signal processing) , optics , physics , materials science , optoelectronics , engineering , telecommunications , microwave , electrical engineering
The paper presents a dual‐wideband bandpass filter using multilayer broadside‐coupled microstrip‐coplanar waveguide (CPW) structure. The half‐wavelength stepped‐impedance resonators at the top and bottom layers are broadside coupled in the vertical direction through a CPW‐multimode resonator (CPW‐MMR) at the mid layer, which forms a mixed MMR. The ultra‐wideband obtained from tight coupling is split into two passbands by introducing extra transmission zeros, good impedance matching is achieved by adopting open‐ended microstrip stubs on the input and output microstrip feed lines, and the dual‐wideband characteristic is realized. The proposed filter is small in size, and its operation bands and the bandwidth of the stopband are adjustable. Both experiments and computer simulations were conducted, and the measured results are in good agreement with the simulation results.