Compact Low-Pass Filter with Wide Stop-Band Using Nonuniform Microstrip Resonant Cells1
首发时间:2010-10-22
Abstract:In this paper, a novel compact microstrip low-pass filter with nonuniform microstrip resonant cells is designed. The proposed filter is formed by cascading the four nonuniform 1-D microstrip photonic bandgap (PBG) cells, while each unit cell was designed with different cutoff frequency etched on the 50Ω microstrip line. The demonstration low-pass filter with the cutoff frequency of 2.2GHz is designed, fabricated and measured. The measurement results show that the band rejection level is more than 20dB from 2.8GHz to 10GHz, the insertion is less than 2dB, and the length of it is 5.6cm. Compared with the conventional filter, this method overcomes the problems of narrow stop-band, low harmonic suppression and has an advantage of miniature circuit size. Moreover, it does not need to consider the impedance matching.
keywords: Filter nonuniform microstrip resonant cell photonic bandgap (PBG) harmonic suppression
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基于非均匀微带谐振结构的紧凑型宽带低通滤波器设计与实现
摘要:近年来,随着移动通信的不断发展,作为系统必备部件之一的滤波器正向小型化,高选择性方向发展。本文提出一种结构新颖又紧凑的低通滤波器的设计方法,即基于非均匀微带谐振单元。将4个具有不同截止频率的非均匀一维光子带隙单元镌刻于50欧姆微带线上,并且通过级联构成该滤波器。利用该结构,本文设计制作了一个截止频率为2.2 GHz的低通滤波器。测试结果表明该滤波器的带外抑制即从2.8 GHz到10 GHz均优于20 dB,插入损耗小于2dB,长度仅为5.6 cm。因此,与传统方法设计的低通滤波器相比,该滤波器的阻带宽,选择性和谐波抑制强,结构紧凑,且无需考虑阻抗匹配问题。
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No.4388545520287128****
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