Liquid crystal-based terahertz slotted phase-shifting unit and its phased array antenna

Abstract

The invention discloses a liquid crystal-based terahertz slotted phase shift unit and a phased-array antenna composed of the liquid crystal-based terahertz slotted phase shift unit. The slotted phaseshift unit comprises upper and lower layers of medium substrates, wherein gaps of the upper and lower layers of medium substrates are injected with liquid crystal layers; a metal microstrip patch electrode is arranged on the lower side of the upper layer of medium substrate; a metal grounding electrode is arranged on the upper side of the lower layer of medium substrate; the metal microstrip patchelectrode comprises a metal layer; a rectangular slot is formed in the middle part of the metal layer; strip-type partitioning slots are symmetrically formed in positions, which are located at two ends of the rectangular slot, on the edge of the metal layer; the phased-array antenna comprises multiple slotted phase shift units; the slotted phase shift units are flatly laid by taking the edge lengths of the upper and lower layers of medium substrates as periods, so as to form the phased-array antenna. The liquid crystal-based terahertz slotted phase shift unit disclosed by the invention has the characteristics of a simple loading circuit, minimization, low manufacturing cost, phase continuous adjustability and the like.

Description

technical field [0001] The invention belongs to the fields of imaging, radar and satellite communication in the field of terahertz, and in particular relates to a liquid crystal-based terahertz slotted phase-shifting unit and a phased array antenna formed thereof. Background technique [0002] Compared with traditional mechanical scanning antennas, electronically scanning phased array antennas have faster and more accurate beam scanning capabilities. Can achieve farther target search and more stable and reliable performance. [0003] Microstrip array reflector antenna combines the advantages of traditional parabolic antenna and microstrip array antenna. Collimated beams can be generated in the submillimeter and terahertz ranges. It has high radiation efficiency and wide beam scanning angle. The core of microstrip array reflector antenna research is how to design the structure and size of each unit, so that it can achieve specific phase compensation for the incident wave, ...

AI Technical Summary

Problems solved by technology

If a wide connection line is used in this process, it will have a great impact on the shifting performance, and it cannot achieve good phase shifting performance in a wide range

The use of narrow connecting wires will increase the difficulty of processing, reduce the yield, increase the loading resistance, and uneven voltage distribution, etc.

In addition, for the phase shifting unit, if the structure is too small, the coverage of the liquid crystal is insufficient, which will lead to uneven electric field distribution in the liquid crystal layer

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