Two-dimensional luneberg lens capable of regulating and controlling working frequency band by using voltage

Abstract

The invention discloses a two-dimensional luneberg lens capable of regulating and controlling a working frequency band by using voltage. The two-dimensional luneberg lens comprises a plurality of first dielectric plates, a plurality of second dielectric plates and a plurality of pairs of metal cross structures, wherein the first dielectric plates and the second dielectric plates are alternately stacked; each pair of metal cross structures in the plurality of pairs of metal cross structures is symmetrically distributed on two sides of the corresponding first dielectric plate; direct-current bias lines are symmetrically arranged on the two sides of each first dielectric plate, connected with the metal cross structures on the two sides of the first dielectric plate respectively and used for being connected with direct-current voltage, and tuning of the working frequency band of the two-dimensional luneberg lens is achieved. According to the invention, the refractive index of gradient distribution is realized through the metal-medium composite metamaterial; focusing can be achieved on plane wave beams incident in any direction in a two-dimensional plane, or cylindrical waves radiated by a feed source located at the focus of the Luneberg lens are converted into plane wave beams with high directivity; and in addition, the working frequency band of the Luneberg lens can be tuned actively by adjusting voltage, and the Luneberg lens has the advantages of being large in application range and high in structural stability.

Description

technical field [0001] The invention relates to the technical field of electromagnetic wave control, in particular to a two-dimensional Luneberg lens whose working frequency band can be regulated by voltage. Background technique [0002] Most optical imaging instruments have all kinds of aberrations. A few optical instruments that do not have aberrations and can make all points in two-dimensional or three-dimensional space into sharp images are called absolute instruments. Lunberg lens is one of them. kind. In addition, when a cylindrical wave or spherical wave feed is introduced, the Lunberg lens can also be used as an antenna to radiate a planar beam with high directivity to a specified direction and allow multi-beam scanning. The traditional manufacturing method of Lunburg lens is to introduce a series of non-uniform concentric dielectric shells, whose dielectric constant varies discretely, so as to meet the gradient distribution of refractive index required by Lunburg l...

AI Technical Summary

Problems solved by technology

[0003] However, most metamaterials use electromagnetic resonance to achieve specific equivalent electromagnetic parameters. They have severe dispersion characteristics and can only work in a narrow frequency band. Once their structure is determined, the working frequency band will also be fixed.

In addition, metamaterials often require the help of supporting frames or substrates to realize the special spatial distribution of electromagnetic resonance units, which easily causes assembly errors and reduces structural stability, limiting the application range of Lunberg lenses.

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