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Programmable non-reciprocal transmission and frequency conversion system based on space-time coding metasurface

A technology of space-time coding and frequency conversion, applied in the field of programmable non-reciprocal transmission and frequency conversion systems, can solve the problems of large size, inconvenient expansion, and difficult integration of non-reciprocal devices and frequency converters, and achieves easy experimental processing, The effect of low price and large degrees of freedom

Active Publication Date: 2021-01-05
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Purpose of the invention: the purpose of the present invention is to solve the problems of the current non-reciprocal devices and frequency converters, which are bulky, costly, difficult to integrate, and inconvenient to expand to the optical band.

Method used

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  • Programmable non-reciprocal transmission and frequency conversion system based on space-time coding metasurface
  • Programmable non-reciprocal transmission and frequency conversion system based on space-time coding metasurface
  • Programmable non-reciprocal transmission and frequency conversion system based on space-time coding metasurface

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Embodiment 1

[0036] Taking reflection as an example, image 3 It is a structural schematic diagram of the space-time encoding metasurface used in this system. The metasurface is composed of 16×8 2-bit reflective programmable units, and each column of 8 units shares the same control voltage. Each unit contains 2 diodes, and different switch combinations constitute the 2-bit reflected phase of the unit, namely 0 degrees, 90 degrees, 180 degrees, 270 degrees, marked as numbers "0", "1", "2" and " 3". for image 3 In the given example, the cycle length of the programmable unit is half of the working wavelength of the incident wave.

Embodiment 2

[0038] Figure 4 It is a space-time coding matrix arrangement used to realize non-reciprocal reflection and +1-order harmonic frequency conversion. The coding sequence of 16 units in space presents a gradient change from right to left, and the coding sequence of length 4 is used in time. Sequences, also exhibit gradient-increasing transformations. Figure 5 is the equivalent amplitude and phase distribution of the space-time encoding matrix at different harmonics, which can be obtained from the coefficients of the Fourier series of the periodic signal in the time domain. can be seen in Figure 4 Under the modulation of this time gradient encoding, the metasurface mainly converts the energy of the incident electromagnetic wave to the +1 order harmonic frequency, the amplitude exceeds 0.9, and there is a gradient equivalent phase distribution in the +1 order harmonic, which can be used It is used to control the emission direction of the +1 order harmonic. Figure 6 yes Figu...

Embodiment 3

[0041] Figure 9 It is a space-time coding matrix arrangement used to realize non-reciprocal reflection and +2-order harmonic frequency conversion. The coding sequence of 16 units in space presents a gradient change from right to left, and the coding sequence of length 10 is used in time The sequence also exhibits a certain nonlinear gradient increase. The encoding is based on an algorithm optimization to efficiently convert the incident wave frequency to the +2nd harmonic frequency. Figure 10 is the equivalent amplitude and phase distribution of the space-time encoding matrix at different harmonics, which can be obtained from the coefficients of the Fourier series of the periodic signal in the time domain. can be seen in Figure 9 Under the modulation of this time gradient encoding, the metasurface mainly converts the energy of the incident electromagnetic wave to the +2-order harmonic frequency, with an amplitude of about 0.84, and there is a gradient equivalent phase dis...

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Abstract

The invention discloses a programmable non-reciprocal transmission and frequency conversion system based on a space-time coding metasurface. The programmable non-reciprocal transmission and frequencyconversion system consists of the space-time coding metasurface and a digital control circuit, wherein the metasurface is formed by periodically arranging time-varying programmable units in space; each unit integrates a plurality of adjustable devices; and multi-bit phase period modulation is presented under the driving of the digital control circuit. According to a specifically designed time andspace phase gradient, efficient frequency conversion and abnormal reflection of incident electromagnetic waves are realized, so that time reversal symmetry is broken through, and a non-reciprocal effect is realized in a space domain and a frequency domain. In addition, different space-time coding matrixes are output through the digital control circuit; the system can be switched between reciprocaland non-reciprocal transmission; a non-reciprocal reflection angle and a harmonic frequency can be adjusted in real time; the dynamic programmable system is realized; and the system has potential applications to the fields of space frequency conversion, Doppler deception, directional transmission, radio frequency stealth, secret communication, isolators, duplexers, frequency mixers and the like.

Description

technical field [0001] The invention belongs to the field of novel artificial electromagnetic surfaces, and in particular relates to a programmable non-reciprocal transmission and frequency conversion system based on a space-time coding metasurface. Background technique [0002] The new artificial electromagnetic surface, also called metasurface, is developed from three-dimensional metamaterials. The difference between metamaterials and metasurfaces and traditional materials is that the atomic or molecular structure in the original material is replaced by sub-wavelength units, which can simulate some physical phenomena that do not exist in nature. On the basis of three-dimensional metamaterials, the metasurface compresses the longitudinal dimension, which is negligible compared to the wavelength. It has two-dimensional ultra-thin structural characteristics, low loss, convenient processing, and easy integration. [0003] Metamaterials and metasurfaces have been developed for...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01Q15/00G02F2/02G02F3/00G05B19/042
CPCG02F2/02G02F3/00G05B19/0423H01Q15/0086
Inventor 崔铁军张磊邵睿文
Owner SOUTHEAST UNIV
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