A Two-Dimensional Lunberg Lens with Temperature Adjustable Working Frequency Band

Abstract

The invention discloses a two-dimensional Luneberg lens capable of temperature regulation and control of the working frequency band. The two-dimensional Luneberg lens comprises a plurality of alternately stacked first dielectric plates and second dielectric plates and multiple pairs of metal cross structures; multiple pairs of metal Each pair of metal cross structures in the cross structure is symmetrically distributed on both sides of the corresponding first dielectric plate; by changing the temperature of the first dielectric plate to change the dielectric constant of the first dielectric plate itself, the The tuning of the operating frequency of the Lunberg lens is described. The present invention realizes the refractive index of the gradient distribution of the two-dimensional Luneberg lens through the metal-dielectric composite metamaterial, and can focus the plane beam incident in any direction in the two-dimensional plane, or radiate the feed source located at the focal point of the two-dimensional Luneberg lens. The cylindrical wave is converted into a plane beam with high directivity. In addition, the working frequency band of Lunberg lens can be actively tuned by adjusting the temperature, which has the advantages of wide application range, convenient control and high 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 capable of temperature-regulating the working frequency band. 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 Lunbu...

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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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