Sub wavelength metal construction lens with millimeter wave band high energy transmissivity

Abstract

The invention relates to a sub wavelength metal construction lens with millimeter wave band high energy transmissivity; the lens design method comprises the following steps: (1) incident light wavelength lambda is determined; (2) geometric parameters of the lens are determined: focal length of lens is f, caliber is D and the thickness of the metal substrate is h; (3) the side length b of a metal rectangle hole is selected along the y direction and the sampling period of the rectangle hole along the y direction is chosen, and the interval d among the square holes is equal to p-b along the y direction; (4) phase delay corresponding to a sampling point the distance of which and the center of the metal substrate is r is calculated according to the aplanaticaplanatism principles, and the phaseis modulated to from 0-2pi; (5) aperiodic sampling is carried out along the x direction, the transverse positions of the rectangle holes are rationally arranged to lead the interval of the adjacent rectangle holes to be d along the x direction. By choosing rational parameters, the sampling density of the rectangle hole is improved and the duty cycle of the rectangle hole is greatly improved, so as to design the construction lens with high energy transmissivity.

Description

technical field [0001] The invention relates to a lens device, in particular to a sub-wavelength metal structure lens with high energy transmittance and high energy diffraction efficiency. Background technique [0002] The traditional dielectric lens has the disadvantages of large loss in the microwave band, complex surface processing, and large volume, which is not easy to integrate and miniaturize the optoelectronic system. Therefore, people have developed various types of lenses for the determination of traditional dielectric lenses. E. Jehamy et al. designed a tightly-constrained metal plate lens through waveguide theory. This lens uses parallel conductive plates separated by different distances to produce an equivalent coal with a refractive index less than 1 to achieve focusing and successfully applied to millimeter-wave band antennas. radiation on. The flat BOOTLACE waveguide lens uses a waveguide with different broadside dimensions inserted into the receiving surfa...

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a sub-wavelength metal structure lens with high energy transmittance and high diffraction efficiency in the millimeter wave band for the problem of low energy transmittance and diffraction efficiency in the periodic sampling sampling mode. The efficiency can reach more than 70%, and the diffraction efficiency can be increased to more than 50%, which greatly improves the energy transmittance and the diffraction efficiency of the lens

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