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首页> 外文会议>IEEE MTT-S International Microwave Symposium >Tunable dielectric delay line phase shifter based on liquid crystal technology for a SPDT in a radiometer calibration scheme at 100 GHz
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Tunable dielectric delay line phase shifter based on liquid crystal technology for a SPDT in a radiometer calibration scheme at 100 GHz

机译：在100 GHz辐射计校准方案中，基于液晶技术的SPDT可调介电延迟线移相器

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摘要

This paper presents for the first time, an electrically tunable dielectric line based on fiber topology. A fiber segment is filled with liquid crystal (LC) for continuous tuning of the differential phase between 0° to 90° by an applied biasing voltage of up to ±500 V. This phase shifter is aimed to be implemented into a RF switch (Single-Pole Double-Throw, SPDT), to switch between the calibration loads and the antenna of a radiometer at 100 GHz. A subwavelength topology was chosen, where compared to classical dielectric waveguides, air is acting as cladding material, ensuring a low loss propagation comparable to hollow waveguides. The phase shifting section has a total length of 26mm and provides a maximum differential phase shift of more than 107° and 115° at 100GHz for electric and magnetic biasing, respectively. Accompanied by insertion losses between 2.5 dB to 3.0 dB, the phase shifter shows a figure of merit at 100GHz of 42 °/dB for electric and 44 °/dB for magnetic biasing.
机译：本文首次提出了一种基于光纤拓扑的电可调介质线。光纤段填充有液晶（LC），可通过施加的最大±500 V偏置电压在0°至90°之间连续调整微分相位。该移相器旨在实现为RF开关（单相）。 -双刀双掷（SPDT），以在校准负载和100 GHz辐射计的天线之间切换。选择了亚波长拓扑，与传统的介质波导相比，空气充当包层材料，从而确保了与中空波导相比低损耗的传播。相移部分的总长度为26mm，并且在100 GHz时分别为电偏置和磁偏置提供大于107°和115°的最大差分相移。伴随着2.5 dB至3.0 dB之间的插入损耗，移相器在100GHz时的品质因数为42°/ dB（电偏置）和44°/ dB（磁偏置）。

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