A wide stopband filter with source-load coupling technique

Kwok Keung Chon, Ching Jui Wu, Fenq-Lin Jenq, Hong Yu Jhuang, Shih Fong Chao

Research output: Chapter in Book/Report/Conference proceedingConference contribution


In this paper, a wide stopband bandpass filter using source-load coupling technique is proposed. With the source-load coupling structure, multiple transmission zeros are generated to suppress the harmonic responses in the stopband. By adjusting the gap space between the input/output feed lines, the locations transmission zeros can be controlled. Moreover, the open stub of the input/output feed lines are also used to generate transmission zeros in the stopband. In this design, stepped-impedance resonators (SIR) are utilized to minimize the overall circuit size and control the harmonic frequencies. The impedance and length ratios of the SIR are determined to move its first harmonic to a higher frequency. The center frequency of the filter is 2.45GHz, and the stopband rejection is higher than 30dB from 2.9 GHz to 13.36 GHz.

Original languageEnglish
Title of host publicationPIERS 2015 Prague - Progress In Electromagnetics Research Symposium, Proceedings
PublisherElectromagnetics Academy
Number of pages4
ISBN (Electronic)9781934142301
Publication statusPublished - 2015 Jan 1

Publication series

NameProgress in Electromagnetics Research Symposium
ISSN (Print)1559-9450
ISSN (Electronic)1931-7360

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering
  • Electronic, Optical and Magnetic Materials


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