A broadband zero-crossing polarization spatiotemporal coded digital metasurface unit and its control method

A space-time encoding and metasurface technology, applied in the direction of electrical components, antennas, etc., can solve the problems of narrow bandwidth and serious cross polarization, and achieve the effect of reducing unit spacing, increasing current path, and increasing unit electrical size
CN110911845BActive Publication Date: 2020-10-09PEKING UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
PEKING UNIV
Publication Date
2020-10-09

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Abstract

The invention discloses a broadband zero cross polarization space-time coding digital metasurface unit and a control method. A radiator is used. The edge of the radiator is provided with a plurality of micro-tuning sheets and a micro-tuning hole in the center. The radiator is connected with the radio frequency switch. The two states of turning off and turning on the radio frequency switch are respectively corresponding to a turning-off mode and a turning-on mode. By optimizing the sizes of the micro-tuning holes and the micro-tuning pieces, the electric field distribution of the turn-off modeand the electric field distribution of the turn-on mode are kept consistent near the target frequency as much as possible, so that the stable phase difference between the two modes is obtained, and the space-time coding digital metasurface unit can work in the regulation and control of the broadband one-bit 180-degree reflection phase. Besides, through reasonable design of the AC-DC isolator, loading of the bias circuit hardly changes the original phase difference of the unit, unit loss is avoided, and unnecessary cross polarization caused by damage to the symmetry of the unit is avoided. According to the invention, 180-degree phase shift is realized within the frequency band of 7.71-9.48 GHz.
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Description

technical field

[0001] The invention relates to coded digital metasurface technology, in particular to a broadband zero-cross polarization space-time coded digital metasurface unit and a control method thereof. Background technique

[0002] As a two-dimensional equivalent metamaterial, a metasurface is a two-dimensional surface with special electromagnetic properties processed or synthesized artificially. Due to its low profile, easy processing, low cost and excellent electromagnetic properties that may not be obtained in nature In recent years, it has attracted the attention of more and more scholars in the scientific and engineering circles. Compared with three-dimensional bulk metamaterials, the thickness of the metasurface is negligible, and it has better integration.

[0003] In 2018, some scholars combined the encoded digital metasurface with the phase switching screen and the time modulation array, and proposed the concept of space-time encoded digital metasurface. ...

Claims

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