High‐quality coplanar waveguide tunable band‐stop filter using defected ground structure and comb‐line resonator with radio frequency microelectromechanical system varactors,International Journal of Circuit Theory and Applications

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High‐quality coplanar waveguide tunable band‐stop filter using defected ground structure and comb‐line resonator with radio frequency microelectromechanical system varactors
International Journal of Circuit Theory and Applications ( IF 1.8 ) Pub Date : 2020-06-09 , DOI: 10.1002/cta.2828
S. Mehdi Mirebrahimi ₁ , Massoud Dousti ₁ , Saed Afrang ₂

Affiliation

A new analog tunable Ka‐band band‐stop filter is proposed on high resistivity silicon (HRS) substrate using radio frequency microelectromechanical systems (RF MEMS) varactors for satellite and radar applications. The designed filter uses a λ/4 comb‐line resonator on the center line of a coplanar waveguide (CPW) with a new uncommon defected ground structure (DGS). Using the DGS in the proposed structure not only decreases the lateral size of the filter but also increases the quality factor. The tuning range of the proposed filter is 29.8–35.6 GHz with a maximum actuation voltage of 44.5 V and a band rejection between 37 and 45 dB. The quality factors of the designed filter in the up and down states of the MEMS varactors are 162 and 292, respectively. The equivalent circuit model of the filter is exactly extracted, and DGS dimensions are optimized. Based on the frequency simulation using ANSOFT HFSS 14, the insertion loss of the designed filter is about 0.51 dB in the 0–20 GHz range and 2 dB in the 0–15 GHz range in, respectively, up and down state of the bridge. The return losses are 0.51 and 0.33 dB at the center frequency for the up‐ and down‐state configuration of the bridge. A step‐by‐step fabrication process is also proposed for designing the band‐stop filter. High quality factor, small size, and improved structure are the advantages of the proposed design.

中文翻译：

高质量共面波导可调带阻滤波器，采用有缺陷的接地结构和带射频微机电系统变容二极管的梳状线谐振器

在高电阻率硅（HRS）衬底上，提出了一种新型的可调谐模拟Ka波段带阻滤波器，该滤波器使用了射频微机电系统（RF MEMS）变容二极管，用于卫星和雷达应用。设计的滤波器使用λ位于共面波导（CPW）中心线上的/ 4梳状线谐振器，带有新的不常见缺陷接地结构（DGS）。在提出的结构中使用DGS不仅可以减小滤波器的横向尺寸，而且可以提高品质因数。拟议滤波器的调谐范围为29.8–35.6 GHz，最大激励电压为44.5 V，带阻在37至45 dB之间。MEMS变容二极管处于向上和向下状态时，设计滤波器的品质因数分别为162和292。精确提取滤波器的等效电路模型，并优化DGS尺寸。基于使用ANSOFT HFSS 14进行的频率仿真，在电桥的上，下状态下，设计滤波器的插入损耗在0-20 GHz范围内约为0.51 dB，在0-15 GHz范围内约为2 dB。对于电桥的上，下状态配置，在中心频率处的回波损耗分别为0.51和0.33 dB。还提出了用于设计带阻滤波器的分步制造过程。高品质因数，小尺寸和改进的结构是所提出设计的优点。

更新日期：2020-06-09

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