A bandpass filter using dielectric coaxial resonators with a temperature-stable stepped-impedance structure

  1. Sang-Kyu Lim1,
  2. Duck-Whan Kim1,
  3. Han-Young Lee2,
  4. Chul An1

Article first published online: 21 NOV 2002

DOI: 10.1002/mop.10651

Issue

Microwave and Optical Technology Letters

Microwave and Optical Technology Letters

Volume 35, Issue 6, pages 508–510, 20 December 2002

Additional Information

How to Cite

Lim, S.-K., Kim, D.-W., Lee, H.-Y. and An, C. (2002), A bandpass filter using dielectric coaxial resonators with a temperature-stable stepped-impedance structure. Microw. Opt. Technol. Lett., 35: 508–510. doi: 10.1002/mop.10651

Author Information

  1. 1

    Department of Electronic Engineering R262, Sogang University, Seoul 121-742, Korea

  2. 2

    Korea Electronics Technology Institute, Pyungtaek-si, Kyunggi-do 451-860, Korea

Publication History

  1. Issue published online: 21 NOV 2002
  2. Article first published online: 21 NOV 2002
  3. Manuscript Received: 5 JUN 2002

Funded by

  • Brain Korea 21 program of the Korean Ministry of Education

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Keywords:

  • microwave bandpass filter;
  • dielectric coaxial resonator;
  • stepped-impedance resonator

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 (τf), and the other has a negative τf. 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

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