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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

Active Publication Date: 2020-10-09
PEKING UNIV
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Problems solved by technology

[0006] Aiming at the problems of narrow bandwidth and serious cross-polarization of the current space-time coding digital metasurface, the present invention proposes a broadband zero-cross-polarization space-time coding digital metasurface unit and its control method

Method used

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

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Embodiment Construction

[0033] The present invention will be further elaborated below through specific embodiments in conjunction with the accompanying drawings.

[0034] Such as figure 1 and 5 As shown, the broadband zero-crossing polarization spatio-temporal encoding digital metasurface unit of this embodiment includes: a first substrate 1, a metal ground 2, a second substrate 3, a radio frequency switch 4, a bias via 5, and a DC via 6 , positive electrode 7, negative electrode 8, microstrip transmission line, DC isolator 9 and radiator 10; wherein, a metal ground 2 is set on the first substrate 1; a second substrate 3 is set on the metal ground 2; A radio frequency switch 4 is arranged on one side of the second substrate 3; a radiator 10 is arranged on the second substrate 3; the anode of the radio frequency switch 4 is connected to the radiator 10 through a microstrip transmission line; on the first substrate 1, the metal ground 2 and On the second substrate 3 and under the radiator 10, two off...

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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.

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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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01Q15/00
CPCH01Q15/002H01Q15/0086
Inventor 王迪王艺东双雅谭云华刘濮鲲
Owner PEKING UNIV
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