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Design of a wideband bandpass filter using microstrip parallel-coupled dual-mode ring resonator

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5 Author(s)
Zhewang Ma ; Graduate School of Science and Engineering, Saitama University, 255 Shimo-Okubo, Sakura-ku, Saitama-shi, 338-8570, Japan ; Hideyuki Sasaki ; Chun-Ping Chen ; Tetsuo Anada
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In this paper, a micostrip parallel-coupled dual-mode ring resonator is analyzed based on its equivalent transmission line circuit and the even- and odd-mode method. Closed-form formulas relating the transmission zeros and 3dB fractional bandwidth of the resonator to the circuit parameters are derived, and are verified effective by using a circuit simulator and an electromagnetic simulator. A bandpass filter is designed by using this type of dual-mode resonator, and it shows a wide passband with a 3dB fractional bandwidth of 30%, low reflection loss in the passband, and very sharp passband skirt property.

Published in:

2010 Asia-Pacific Microwave Conference

Date of Conference:

7-10 Dec. 2010