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A bandpass filter using dielectric coaxial resonators with a temperature‐stable stepped‐impedance structure
Author(s) -
Lim SangKyu,
Kim DuckWhan,
Lee HanYoung,
An Chul
Publication year - 2002
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.10651
Subject(s) - band pass filter , passband , resonator , coaxial , center frequency , materials science , electrical impedance , microwave , acoustics , mechanical filter , filter (signal processing) , optoelectronics , electronic engineering , electrical engineering , low pass filter , prototype filter , engineering , physics , telecommunications
In this paper, a bandpass filter using stepped‐impedance coaxial resonators is presented. Each stepped‐impedance resonator (SIR) is composed of ceramic/material to ensure temperature stability of the resonant frequency; one has a positive temperature coefficient of resonant frequency (τ f ), and the other has a negative τ f . A capacitively coupled three‐pole bandpass filter is designed and fabricated to have a center frequency of 915 MHz and a passband bandwidth of 20 MHz. The improved temperature stability of this filter is demonstrated by experimental results. © 2002 Wiley Periodicals, Inc. Microwave Opt Technol Lett 35: 508–510, 2002; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.10651