A Novel Two-state filter switched between LPF and BPF based on CPW transmission line with RF MEMS Switch
首发时间:2010-11-03
Abstract:In this paper, a novel switchable filter which can alternate between low-pass filter (LPF) and band-pass filter (BPF) is proposed, based on the micro-electromechanical systems' (MEMS) capacitive-contact switch on coplanar waveguide (CPW) transmission line. The novel design is constructed using electromagnetic band-gap (EBG) structures and the combination between the MEMS switch and the coupled slot of CPW signal line. When the MEMS capacitive-contact switch stays with up-state, the EBG BPF is obtained with the resonant frequency of 15.9GHz and the bandpass frequency ranged from 2.5 to 28.3GHz. When the MEMS capacitive-contact switch is pulled down by DC bias voltage, an EBG LPF is yielded with 3dB cut-off frequency is 28.1GHz. The MEMS capacitive-contact switch is applied as the transformer between LPF and BPF using a cantilever beam.
keywords: Low-pass filter Band-pass filter MEMS capacitive-contact switch Electromagnetic bandgap (EBG) Coplanar waveguide (CPW)
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一种新型基于共面波导线用RF MEMS开关切换低通和带通状态的可调滤波器
摘要:本文提出了一种用RF MEMS电容-接触开关切换低通滤波器(LPF)和带通滤波器(BPF)状态的可调滤波器。这种带阻滤波器是基于共面波导线,使用表面微加工工艺刻蚀出EBG结构和RF MEMS开关。当MEMS开关处于Up态时,滤波器处于BPF态,谐振频率为15.9GHz, 通带范围为2.5-28.3GHz;当开关在驱动电极的作用下处于Down态时,滤波器处于LPF态,其3-dB截止频率为28.1GHz。文中对该滤波器提出了等效集总电路参数模型分析,并用有限元分析软件进行仿真,分析结果具有一致性。
关键词: 低通滤波器 带通滤波器 MEMS 电容接触开关 电磁带隙 共面波导
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一种新型基于共面波导线用RF MEMS开关切换低通和带通状态的可调滤波器
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