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Journal Article
A bandpass filter using dielectric coaxial resonators with a temperature‐stable stepped‐impedance structure
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- Authors
- Sang-Kyu Lim, Duck-Whan Kim, Han-Young Lee, Chul An
- Issue Date
- 2002-12
- Citation
- Microwave and Optical Technology Letters, v.35, no.6, pp.508-510
- Language
- English
- Type
- Journal Article
- Abstract
- 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 (?꼎), and the other has a negative ?꼎. 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.