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A Novel Two-state filter switched between LPF and BPF based on CPW transmission line with RF MEMS Switch
Zhu Huazhang *,Huang Jianming
School of Electronic Engineering, Beijing University of Posts and Telecommunications
*Correspondence author
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Funding: Fundamental Research Funds for the Central Universities （No.BUPT No. 2009RC0302）
Opened online: 3 November 2010
Accepted by: none
Citation: Zhu Huazhang,Huang Jianming.A Novel Two-state filter switched between LPF and BPF based on CPW transmission line with RF MEMS Switch[OL]. [ 3 November 2010] http://en.paper.edu.cn/en_releasepaper/content/4389646
 
 
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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