Highly Miniaturized Continuously Tunable Phase Shifter Based on Liquid Crystal and Defected Ground Structures
Highly Miniaturized Continuously Tunable Phase Shifter Based on Liquid Crystal and Defected Ground Structures
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DOI：
10.1109/lmwc.2022.3142410
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发表时间：
2022-06
影响因子：
3
通讯作者：
Dongwei Wang;E. Polat;H. Tesmer;R. Jakoby;H. Maune
中科院分区：
文献类型：
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作者：
Dongwei Wang;E. Polat;H. Tesmer;R. Jakoby;H. Maune
本文介绍了一种10 ~ 67 GHz的高度小型化连续可调谐微带线移相器。该设计利用微带线拓扑结构的接地平面与缺陷接地结构（DGSs）。这导致传输线（TL）的慢波（SW）效应，因此TL可以是物理紧凑的，同时保持其电长度。采用介电常数各向异性的可调谐微波液晶作为介质，实现了延迟线移相器。所提出的微带LC移相器与DGS和标准微带LC移相器作为参考都填充有20 mm厚的高性能LC GT3-23001。通过比较，与DGS的一个表现出显着的SW效应和改善的LC调谐效率，导致显着提高的品质因数（FoM）和紧凑性比参考。第二个微带LC移相器利用DGS填充5 mm厚的更先进的GT 7 -29001 LC显示出出色的FoM为55°/dB，紧凑性为201 ^{\circ }/{\lambda }_{0}$，响应时间为210 ms。
This letter presents a highly miniaturized continuously tunable microstrip line phase shifter from 10 to 67 GHz. The design takes the advantage of the microstrip line topology by a ground plane with defected ground structures (DGSs). This leads to slow wave (SW) effect of the transmission line (TL), thus the TL can be physically compact, while maintaining its electric length. By applying tunable microwave liquid crystal (LC) with an anisotropic permittivity as dielectric, a delay line phase shifter is realized. The proposed microstrip LC phase shifter with DGS and a standard microstrip LC phase shifter as reference are both filled with 20-mm-thick high-performance LC GT3-23001. By comparison, the one with DGS exhibits a significant SW effect and an improved LC tuning efficiency which leads to a remarkable enhancement of figure of merit (FoM) and compactness than the reference. A second microstrip LC phase shifter utilizing DGS filled with 5-mm thick more advanced GT7-29001 LC shows outstanding FoM of 55°/dB, compactness of $201^{\circ }/{\lambda }_{0}$ , and response time of 210 ms.