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A novel compact bandstop filter with interdigital and spiral structure
Author(s) -
Zhang XiaoYu,
Yang Wang,
Yoon KiCheol,
Lee JongChul
Publication year - 2017
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.30799
Subject(s) - band stop filter , stopband , miniaturization , bandwidth (computing) , resonator , spiral (railway) , electronic engineering , center frequency , filter (signal processing) , fractional bandwidth , prototype filter , materials science , band pass filter , optoelectronics , acoustics , electrical engineering , engineering , low pass filter , physics , telecommunications , mechanical engineering
A compact bandstop filter (BSF) based on frequency‐selecting coupling structure (FSCS) is presented. Quarter‐wavelength FSCS with an open‐circuited resonator is used to implement a BSF. Spiral and interdigital structures are finely designed to realize a further miniaturization. The performance of this filter is evaluated in both simulations and measurements. The operating frequency is 4.3 GHz with an insertion loss (IL) below 15.2 dB and a 3 dB fractional bandwidth of 94.2%. The stopband frequency contains 2.45 and 5.8 GHz, which can be widely used in Wi‐Fi and other applications. There is a good agreement between the simulation and measurement results. The size of the proposed filter is 4.6 × 8.79 mm 2 .