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High-efficiency electromagnetic wave frequency conversion time-domain metasurface

A frequency conversion and electromagnetic wave technology, applied in the direction of electrical components, antennas, etc., to achieve the effects of large phase shift range, reduced design complexity, and low transmission loss

Active Publication Date: 2021-04-27
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The control signals of traditional tunable metasurfaces are all static, or changing at very low frequencies, so it is a linear device that can only regulate some linear characteristics of electromagnetic waves, such as amplitude, phase, polarization, etc.

Method used

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  • High-efficiency electromagnetic wave frequency conversion time-domain metasurface
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  • High-efficiency electromagnetic wave frequency conversion time-domain metasurface

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Embodiment Construction

[0019] like figure 1 As shown, a high-efficiency electromagnetic wave frequency conversion time-domain metasurface is formed by periodic arrangement of the same basic unit, and multiple basic units are formed into an array through a feed network, similar to a planar reflector array. Its reflection coefficient can be adjusted in real time through an external control signal. Therefore, when the metasurface is irradiated by electromagnetic waves, real-time manipulation of various characteristic parameters of the reflected waves can be realized.

[0020] The principle of the present invention is to use an external control signal to make the phase of the reflection coefficient of the basic unit change linearly and periodically in a form with a certain slope, and the period is T. At this time, when the incident electromagnetic wave is a single tone frequency f c , the electromagnetic wave reflected by the metasurface will change into a mixing signal centered on the frequency of th...

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Abstract

The invention discloses a high-efficiency electromagnetic wave frequency conversion time-domain metasurface, which comprises: n basic units are periodically arranged and controlled by signals generated by the same control circuit. The beneficial effects of the present invention are: (1) the principle of the present invention is simple, and the frequency conversion of electromagnetic waves can be realized only by changing the frequency and waveform of the control signal; (2) the present invention uses a plurality of basic units to form an array, controlled by the same signal , which can reduce the interference caused by different boundaries to the unit reflection coefficient, and also reduce the complexity of the feed network design; (3) Compared with the traditional design, the basic unit of the present invention has the characteristics of large phase shift range and low transmission loss. , so it has ultra-high conversion efficiency and excellent ability to suppress interference harmonics.

Description

technical field [0001] The invention relates to the technical field of artificial electromagnetic materials, in particular to a high-efficiency electromagnetic wave frequency conversion time-domain metasurface. Background technique [0002] A new type of artificial electromagnetic surface, also known as a metasurface, can control the amplitude, phase, polarization, beam, orbital angular momentum and other parameters of electromagnetic waves by designing its unit characteristics and spatial arrangement, so as to realize the deflection, focusing and absorption of electromagnetic energy And other functions, can be used in antenna, imaging and other fields. By introducing tunable technology, tunable metasurfaces that can control the parameters of electromagnetic waves in real time can be designed. The control signals of traditional tunable metasurfaces are static or change at very low frequencies, so they are linear devices that can only regulate some linear characteristics of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01Q15/00
CPCH01Q15/0086
Inventor 程强戴俊彦杨刘曦柯俊臣陈明正唐万恺李享陈茂吴詹皓金石崔铁军
Owner SOUTHEAST UNIV
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