IEICE Electronics Express
Online ISSN : 1349-2543
ISSN-L : 1349-2543
A microstrip dual-band bandpass filter using feed line with SIR
Jong Won EunJae-Hyun Lee
Author information

2017 Volume 14 Issue 4 Pages 20170022


In this paper, a new design method of the dual-band bandpass filter which consists of feed line with stepped-impedance resonator (SIR) structure, open-loop ring resonator (OLRR) with SIR, and uniform OLRR is proposed. The SIR structure which can control harmonic frequencies is used to provide the maximum magnetic coupling at the same positions of both the upper and lower feed lines, irrespective of the first passband and the second passband of the dual-band bandpass filter and improve characteristic of stopband between the first and second passbands. This proposed design method was confirmed to be useful from measured results for dual-band bandpass filter operated at 2.4 GHz and 5.5 GHz.

Information related to the author
© 2017 by The Institute of Electronics, Information and Communication Engineers
Previous article