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Design of a broadband bandpass filter using microstrip stubs-loaded three-mode resonator

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5 Author(s)
Zhewang Ma ; Graduate School of Science and Engineering, Saitama University, 255 Shimo-Ohkubo, Sakura-ku, 338-8570, Japan ; Toru Kimura ; Masataka Ohira ; Chun-Ping Chen
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A novel microstrip stubs-loaded three-mode resonator is proposed, and a wideband bandpass filter having a midband frequency of 4.1GHz and a fractional bandwidth of 34.2% is designed to meet Japan's UWB low-band spectrum mask. The stubs-loaded three-mode resonator is simultaneously used with half-wavelength resonators and a coupled-line hairpin resonator. As a consequence, the desired wide passband is obtained, meanwhile multiple transmission zeros in the stopband of the filter are produced, which result in a sharp passband skirt and a very wide stopband. The frequency response of the filter satisfies well Japan's UWB spectrum mask.

Published in:

Asia-Pacific Microwave Conference 2011

Date of Conference:

5-8 Dec. 2011