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Wideband bandstop filter using an SIR based interdigital capacitor
Author(s) -
Kim Changsoon,
Shrestha Bhanu,
Son Kwang Chul
Publication year - 2018
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.31385
Subject(s) - return loss , wideband , capacitor , center frequency , bandwidth (computing) , microstrip , insertion loss , resonator , band stop filter , transmission line , electrical impedance , electronic engineering , electrical engineering , materials science , acoustics , engineering , telecommunications , physics , band pass filter , low pass filter , voltage , antenna (radio)
In this article, a microstrip wideband bandstop filter (W‐BSF) with a stepped impedance resonator (SIR)‐based interdigital capacitor (IDC) is proposed. By using an SIR‐based symmetric IDC, a wide rejection of bandwidth of 4.27 GHz at the center frequency of 5.85 GHz can be achieved. The insertion loss ( S 21 ) and return loss ( S 11 ) were 17.89 dB and 0.22 dB at 5.85 GHz, respectively, in the measurement results, which also verified that the bandwidth can be widely tuned by increasing the length, d from the main transmission line to the SIR‐based symmetric IDC section. As a result, we achieved practically applicable simulated and measured S ‐parameter responses. The overall dimension of the optimized W‐BSF was (13.80 × 10.98) mm 2 .