A low‐loss compact six‐bit DMTL phase shifter for phased array antenna applications,International Journal of Circuit Theory and Applications

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A low‐loss compact six‐bit DMTL phase shifter for phased array antenna applications
International Journal of Circuit Theory and Applications ( IF 1.8 ) Pub Date : 2020-09-24 , DOI: 10.1002/cta.2871
Mir Majid Teymoori ₁ , Massoud Dousti ₁ , Saeid Afrang ₂

Affiliation

A phase shifter is one of the main components of radars and phased array systems. In this paper, a novel three‐state two‐bridge unit cell is presented for a compact low‐loss six‐bit distributed microelectromechanical systems (MEMS) transmission line (DMTL) phase shifter. The proposed unit cell includes a coplanar waveguide (CPW) transmission line, a MEMS bridge on the signal line, two metal‐air‐metal (MAM) capacitors on a glass substrate, and two additional electrodes under the MEMS bridge, near the signal line. Using these electrodes, it is possible to generate two different phase states employing the MEMS bridge, and the third state is produced by a metal‐air‐metal (MAM) bridge. Hence, the designed structure can generate three different phase shifts per unit cell (i.e., 5.625°, 11.25°, and 22.5° phase shifts). The novelty of this design is that the number of unit cells is considerably reduced from 64 in a conventional six‐bit phase shifter to only 17 in our design. Therefore, the total length of the six‐bit phase shifter and average loss are considerably reduced. The designed structure is calculated and simulated at 32 GHz using MATLAB and ANSOFT HFSS, respectively. According to the calculation and simulation results, the lateral size of the phase shifter is only 8.5 mm, the root mean square (RMS) phase error is 1.38°, and the average loss is 1.1 dB. The feasibility of the proposed design is investigated using the proposed fabrication process. The designed phase shifter can be easily scaled to other frequencies for radar and satellite applications with more bits.

中文翻译：

适用于相控阵天线应用的低损耗紧凑型六位DMTL移相器

移相器是雷达和相控阵系统的主要组件之一。本文针对紧凑型低损耗六位分布式微机电系统（MEMS）传输线（DMTL）移相器，提出了一种新颖的三态二桥单元电池。拟议的单元电池包括共面波导（CPW）传输线，信号线上的MEMS桥，玻璃基板上的两个金属-空气-金属（MAM）电容器以及信号线附近的MEMS桥下的两个附加电极。使用这些电极，可以使用MEMS桥产生两个不同的相态，而第三种状态是由金属-空气-金属（MAM）桥产生的。因此，设计的结构可以为每个晶胞产生三种不同的相移（即5.625°，11.25°和22.5°的相移）。这种设计的新颖之处在于，单位单元的数量从传统的六位移相器中的64个大大减少到了我们设计中的17个。因此，六位移相器的总长度和平均损耗大大降低。分别使用MATLAB和ANSOFT HFSS在32 GHz下对设计的结构进行了计算和仿真。根据计算和仿真结果，移相器的横向尺寸仅为8.5 mm，均方根（RMS）相位误差为1.38°，平均损耗为1.1 dB。使用拟议的制造工艺研究了拟议设计的可行性。设计的移相器可以很容易地按比例缩放到其他频率，以用于雷达和卫星应用。

更新日期：2020-09-24

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