Reflective dual-layer liquid crystal phase shifting unit based on patterned graphene electrode

Abstract

The invention discloses a reflective dual-layer liquid crystal phase shifting unit based on a patterned graphene electrode. The reflective dual-layer liquid crystal phase shifting unit comprises an upper medium substrate layer, a middle medium substrate layer and a lower medium substrate layer, a first liquid crystal layer is injected into a gap formed between the upper medium substrate layer andthe middle medium substrate layer, the lower surface of the upper medium substrate layer is provided with a plurality of metal patches which are sequentially connected in series through a connecting line, and a metal microstrip structure is formed; the upper surface of the lower medium substrate layer is fully covered with a metal layer, and a metal grounded electrode is formed; and a second liquid crystal layer is injected into a gap formed between the middle medium substrate layer and the metal grounded layer, and a graphene patch layer which has the same structure as the metal microstrip structure and has the different thickness is arranged on the upper surface of the middle medium substrate layer to serve as a graphene electrode. According to the phase shifting unit, electricity tuningof dielectric constants of two layers of liquid crystal materials can be achieved, and therefore the working bandwidth of the phase shifting unit is increased; and meanwhile, by changing the bias voltage of the graphene electrode, the chemical potential energy of graphene can be changed, and then the working bandwidth of the phase shifting unit is further increased.

Description

Technical field [0001] The present invention relates to the technical field, in particular to a reflective double-layer liquid crystal phase shifting unit based on patterned graphene electrodes. Background technique [0002] The planar reflective array antenna has the advantages of simple structure, lower cost, lower loss and higher radiation efficiency. The principle of the reflective array antenna is to use the phase shift function of the reflective unit to achieve beam focusing. The key to the study of reflective array antennas is to design the structure and size of the reflective unit to obtain excellent phase shifting performance. The traditional microstrip reflection unit needs to add a phase shifter. These phase shifters are restricted by factors such as high frequency parasitic effects and difficult processing, and can only work below the W band. However, the existing liquid crystal phase shifting units all use a single-layer liquid crystal substrate, and the working ba...

AI Technical Summary

Problems solved by technology

The traditional microstrip reflection unit needs to add a phase shifter. These phase shifters are restricted by factors such as parasitic effects in the high frequency band and difficult processing, and can only work below the W band.

However, the existing liquid crystal phase shifting units all use a single-layer liquid crystal substrate, and the working bandwidth is limited.

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