Phase shift unit and terahertz reflection-type liquid crystal phase shifter formed by phase shift unit

Abstract

The invention discloses a phase shift unit and a terahertz reflection-type liquid crystal phase shifter formed by the phase shift unit. The phase shift unit comprises a dielectric substrate, an electrode structure and a liquid crystal layer, wherein the dielectric substrate comprises two dielectric substrate bodies which are oppositely fixed and are parallel to each other; the electrode structure comprises two microstrip patch electrodes and a metal reflection electrode; the two microstrip patch electrodes are arranged on the opposite surfaces of the two dielectric substrate bodies respectively and are arranged in a mirror symmetry manner; the metal reflection electrode is arranged on the other surface of one dielectric substrate body; two sides of each microstrip patch electrode are connected with metal connection wires; a liquid crystal layer is arranged in the gap between the two dielectric substrate bodies; the terahertz reflection-type liquid crystal phase shifter comprises a plurality of phase shift units; and different DC bias voltage is added to each phase shift unit. According to the phase shift unit and the terahertz reflection-type liquid crystal phase shifter, the performance of the phase shift unit is improved; the phase shift range is greatly improved; meanwhile, the structure is simple; the preparation technology is easy to implement; the required bias voltage is relatively low; and the manufacturing cost is relatively low.

Description

technical field [0001] The invention belongs to the technical field of components in the technical fields of terahertz satellite communication and phased array radar, and in particular relates to a phase shifting unit and a terahertz liquid crystal phase shifter composed of the same. technical background [0002] Since the wavelength of the terahertz frequency band is much smaller than that of the usual microwave and millimeter wave bands, it has strong penetration, high resolution, and wide bandwidth, so it has good time resolution and spatial resolution. Therefore, the terahertz radar system is more conducive to high-resolution imaging of the target, and the Doppler effect caused by the movement of the object is more obvious, which is more conducive to the detection of the moving characteristics of the target. [0003] The phase shifter is an important component in the phased array antenna, and its cost and performance directly affect the cost and performance of the phased...

AI Technical Summary

Problems solved by technology

The ferrite material phase shifter has excellent performance, but its manufacturing cost is expensive, the volume is large, and it is not easy to integrate; while the PIN diode or FET switch phase shifter consumes a lot of power; the loss and linearity of semiconductor switches inhibit the The phase shifter is developing towards higher frequency and higher performance; at the same time, as the frequency increases, the device size of the MEMS phase shifter decreases, and the sensitivity of the device performance to the process increases; the InP phase shifter uses active devices, which leads to degraded system noise performance

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