IEICE Electronics Express
Online ISSN : 1349-2543
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Miniaturized lowpass filter with ultra-wide stopband using dual-plane defected structures
Pingjuan ZhangMinquan LiJun Wang
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2015 Volume 12 Issue 2 Pages 20141010

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Abstract

A miniaturized lowpss filter (LPF) with ultra-wide stopband is proposed by using the complementary rectangle split ring defected microstrip structure (CRSR-DMS) and the quad U-shaped defected ground structure (QU-DGS). The presented CRSR-DMS can provide a sharp rejection rate and two obvious attenuation poles while the QU-DGS can produce four independently controlled transmission zeros. Based on the characteristics of the defected structures, the proposed LPF is constructed by using four cascaded CRSR-DMS units and four cascaded QU-DGS units. The measurement result of the designed filter with 3 dB cut-off frequency at 2.0 GHz shows that the obtained 20 dB rejection band ranges from 2.12 GHz to more than 20 GHz within a small circuit area of 0.73λg * 0.13λg, λg being the guided wavelength at 2.12 GHz.

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© 2015 by The Institute of Electronics, Information and Communication Engineers
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