Ultra-wideband microwave vortex super surface and wideband design method thereof

A design method and metasurface technology, applied to electrical components, antennas, etc., can solve problems such as narrow working bandwidth, complex design, and processing

Active Publication Date: 2017-02-01
AIR FORCE UNIV PLA
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Problems solved by technology

In the existing methods of generating microwave vortex beams, either non-planar structures are used, and the design and processing are complicated; or the working bandwidth is very narrow, only 0.2GHz level

Method used

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  • Ultra-wideband microwave vortex super surface and wideband design method thereof
  • Ultra-wideband microwave vortex super surface and wideband design method thereof
  • Ultra-wideband microwave vortex super surface and wideband design method thereof

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Embodiment Construction

[0044] Below to l =1 microwave vortex metasurface as an example, specifically introduce the design process of the metasurface, the design results, and analyze the design results.

[0045] based on Figure 4 From the obtained vortex phase distribution, the geometric structure of the vortex metasurface can be easily obtained by rotating the metasurface unit. The structural layout of the unit is implemented by root-seeking algorithm and macro-modeling based on CST, specifically by calling the phase calculated by Matlab software in the VBA macro module of CST and the VBA macro of unit structure modeling, in which the structural parameters of the unit are implemented by broadband The design method is determined, here only need to determine the rotation angle φ of each unit. Such as Figure 5-Figure 7 As shown, the physical size of the final designed metasurface is L x = L y =168×168mm 2 ,As can be seen, l When =0.5, the unit structure on the metasurface presents an axisymm...

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Abstract

The invention belongs to the technical field of control of microwave band electromagnetic wave, and in particular relates to an ultra-wideband microwave vortex super surface and a wideband design method thereof. The wideband design method comprises the steps of firstly, obtaining a condition of a super surface unit conforming to a PB (Pancharatnam-Berry) geometrical phase under a reflection system by a cascaded matrix method; further obtaining a condition conforming to a wideband PB phase by a dispersion engineering method; secondly, designing two unit structures and parameters which are under orthogonal polarization and conform to multi-mode resonance; and finally, calculating to obtain vortex phase distribution of the vortex super surface under different topological chargers according to a theoretical calculation formula, and applying VBA macro-modeling in CST to achieve a super surface topological structure according to a root seeking algorithm and by rotating the super surface. Therefore, the super surface unit composed of a three-layer metal structure and a two-layer dielectric plate is designed by the invention, and the ultra-wideband microwave vortex super surface is obtained by performing two-dimensional limited periodic extension on a series of super surface units according to certain phase distribution; and the ultra-wideband microwave vortex super surface can generate high-efficiency vortex wave beam between 6-18GHz and has the advantages of ultra wide working bandwidth, high efficiency, simple design, low cost and the like.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic wave control in the microwave segment, and in particular relates to a metasurface capable of generating ultra-broadband microwave vortex beams and a broadband design method thereof. Background technique [0002] The so-called optical vortex means that when the light wave has a helical phase wavefront structure, the wavefront will rotate in a helical manner around a line in the direction of propagation. This type of special light wave or light field is called an optical vortex, which has a helical phase Wavefront and orbital angular momentum have important potential application value in the fields of microparticle manipulation, atomic optics, spatial optical information transmission and processing, etc., and are an emerging field in modern optics. Become the frontier and research hotspot of this discipline. Since the vortex beam is symmetrical about the optical axis, its own interference a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01Q15/00
CPCH01Q15/0046
Inventor 许河秀王光明
Owner AIR FORCE UNIV PLA
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