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Tri‐section stepped impedance resonator with adjustable length and improved second harmonic characteristics
Author(s) -
Kim InSeon,
Kim Ghiback,
Park Jin T.,
Jang Yeon S.,
Park Beom J.
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.31993
Subject(s) - harmonics , resonator , electrical impedance , transmission line , harmonic , center frequency , characteristic impedance , line (geometry) , acoustics , coupling (piping) , filter (signal processing) , electronic engineering , physics , band pass filter , topology (electrical circuits) , mathematics , optics , engineering , telecommunications , electrical engineering , geometry , mechanical engineering , voltage
In this study, we present a novel tri‐section stepped impedance resonator (SIR) with two different lengths ( θ 1 and θ 2 ). The lengths of the first and the last transmission lines of the proposed tri‐section SIR were intentionally chosen. We compared the properties of the proposed SIR and the existing SIR. In the same impedance ratios ( K 1 and K 2 ), the second harmonics of the proposed SIR were improved by 1.05‐1.11 times compared to the existing SIR. In addition, the length of the first transmission line, θ 1 , could be extended by more than twice the length of the existing SIR. That was very advantageous for tight coupling in a coupled line. Finally, a parallel‐coupled line band‐pass filter (PCL BPF) was developed using the proposed SIR, and the design equations were derived. The second harmonic of the PCL BPF was measured with an error of 2.67% compared to the theoretical value. The center frequency was almost identical. A series of processes, including design, simulation, fabrication, and measurement using the proposed structure, was carried out. An analysis of the results of each step proved the validity of our proposal.