A reflective double-layer liquid crystal phase-shifting unit based on patterned graphene electrodes

Abstract

The invention discloses a reflective double-layer liquid crystal phase shifting unit based on a patterned graphene electrode, which includes an upper, middle and lower three-layer dielectric substrate, and a liquid crystal layer 1 is injected into the gap between the upper and middle two-layer dielectric substrate, The lower surface of the upper dielectric substrate is provided with a number of metal patches connected in series through connection lines to form a metal microstrip structure; the upper surface of the lower dielectric substrate is fully covered with a metal layer to form a metal ground electrode; the middle dielectric substrate 1. Liquid crystal layer 2 is injected into the gap of the metal ground layer, and a graphene patch layer with the same structure as the metal microstrip but with a different thickness is arranged on the upper surface of the middle dielectric substrate as a graphene electrode. The phase-shifting unit of the present invention can respectively realize the electrical adjustment of the dielectric constant of the two-layer liquid crystal material, thereby increasing the working bandwidth of the phase-shifting unit; at the same time, by changing the bias voltage of the graphene electrode, the chemical potential energy of the graphene can be changed so that The working bandwidth of the phase shifting unit is further increased.

Description

technical field [0001] The invention relates to the technical field, in particular to a reflective double-layer liquid crystal phase shifting unit based on a patterned graphene electrode. Background technique [0002] The planar reflectarray antenna has the advantages of simple structure, low cost, low loss and high radiation efficiency. The principle of the reflectarray antenna is to use the phase shift function of the reflective unit to achieve beam focusing. The key to the study of reflectarray antennas is to design the structure and size of reflector elements to obtain excellent phase-shift performance. 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 their working bandwidth is...

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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