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MEMS tunable filters based on DGS and waveguide structures: a literature review
Analog Integrated Circuits and Signal Processing ( IF 1.4 ) Pub Date : 2021-05-12 , DOI: 10.1007/s10470-021-01862-7
Seyyed Mehdi Mirebrahimi , Massoud Dousti , Saeid Afrang

In the last two decades, filters based on defected ground structure (DGS) have been employed in various radio frequency systems, and there has been a significant growth in using these structures. In non-tunable filters, a separate unit is used for each telecommunication channel, while the use of tunable filters can reduce the size of multichannel filters. In this paper, tunable filters based on DGS, microstrip and coplanar waveguide (CPW) structures are reviewed. The filters that are designed in this area include either new DGSs or improvements in the previous structures. This paper focuses on tunable filters that have been based on CPW with DGS in the literature since these filters can be easily implemented using CPW lines with coplanar elements realization, no via hole is needed in these filters and radiation loss is less in CPW lines compared to other types of lines. To the best of the author's knowledge, there is currently no review article on the tunable filters based on microstrip and CPW in MEMS technology. This paper can be very useful for starting to work on tunable filters that include DGS.



中文翻译:

基于DGS和波导结构的MEMS可调滤波器:文献综述

在过去的二十年中,基于缺陷接地结构(DGS)的滤波器已在各种射频系统中使用,并且使用这些结构的数量已显着增长。在不可调谐滤波器中,每个电信信道都使用一个单独的单元,而可调谐滤波器的使用可以减小多信道滤波器的大小。本文综述了基于DGS,微带和共面波导(CPW)结构的可调谐滤波器。在此领域中设计的过滤器包括新的DGS或以前结构的改进。本文着重于文献中基于CPW和DGS的可调滤波器,因为这些滤波器可以很容易地使用带有共面元素实现的CPW线来实现,这些滤波器不需要通孔,与其他类型的线相比,CPW线的辐射损耗更小。据作者所知,目前尚无有关基于MEMS技术中基于微带和CPW的可调滤波器的评论文章。本文对于开始使用包含DGS的可调滤波器非常有用。

更新日期:2021-05-12
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