Tunable gradient meta-surface-based reflection electromagnetic wave modulator and design method thereof

A design method and phase gradient technology, applied in electrical components, antennas and other directions, can solve the problems of small phase dynamic adjustable range and narrow bandwidth, and achieve the effect of expanding the phase and frequency control range, reducing the Q value, and reducing the production cost.

Active Publication Date: 2016-02-03
FUDAN UNIV
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Problems solved by technology

However, the previous research on tunable metasurfaces was limited to HMS, and there has been no public report on tunable gradient metasurfaces (TunableGMS, TGMS).
At the same time, for adjustable HMS, due to the introduction of varactor diodes, the Q value is very high, the phase dynamic adjustable range of HMS is very small, and the bandwidth is very narrow

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  • Tunable gradient meta-surface-based reflection electromagnetic wave modulator and design method thereof
  • Tunable gradient meta-surface-based reflection electromagnetic wave modulator and design method thereof
  • Tunable gradient meta-surface-based reflection electromagnetic wave modulator and design method thereof

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[0039] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0040] A kind of broadband adjustable gradient metasurface design method, mainly includes four steps, and method flow is as follows figure 1 As shown, it mainly consists of the following steps:

[0041] Step 1: Determine the unit period p i , Adjacent unit phase difference φ 0 (The present invention assumes that φ 0 =60 o , the number of units is 6), the initial operating frequency f 0 (generally f 0 f c ), the initial capacitance C 0 (generally select the lower limit of the capacitance of the varactor diode), and by changing the structural parameters (changed in the present invention h 2 ) to obtain a set of structural parameters whose phases exhibit a perfect linear gradient;

[0042] Step 2: Simulate the reflection phase of the 1#~6# units obtained above, scan the phase distribution corresponding to different capacitance values ​​C, and obtain the ca...

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Abstract

The invention belongs to the reflection system technical field and relate to a broadband tunable gradient meta-surface-based reflection electromagnetic wave modulator and a design method thereof. A meta unit periodically extends in a two-dimensional plane so as to form the reflection electromagnetic wave modulator (broadband TGMS) of the invention; six TGMS (tunable gradient meta-surface) units with different structural parameters and phases are arranged according to a size sequence so as to form the meta unit which has broadband phase gradient; and the TGMS unit is mainly composed of an upper layer main resonator and auxiliary resonator as well as a middle medium plate and a lower layer metal grounding plate. According to the broadband tunable gradient meta-surface-based reflection electromagnetic wave modulator and the design method thereof of the invention, varactors and double-resonance structures are introduced into the gradient meta-surface units, and therefore, compensation of phase dispersion and continuous regulation of phases can be realized; the switching of surface wave conversion and beam deflection is realized, and beam deflection has very high conversion efficiency in a wide frequency range.

Description

technical field [0001] The invention belongs to the technical field of reflection systems, and in particular relates to a reflective electromagnetic wave modulator based on an adjustable gradient metasurface and a design method thereof. Background technique [0002] Metamaterials (MTMs) refer to "specific" artificial composite structures or materials that do not exist in nature, but are designed with sub-wavelength artificial microstructure units and based on electromagnetic theory, with certain electrical or magnetic responses. Although people can arbitrarily manipulate electromagnetic waves through three-dimensional heterotropic media, high loss and fabrication complexity greatly limit its application. Therefore, there are not many real applications at present. As a two-dimensional planar form of anisotropic medium, a metasurface emerges at the historic moment. Due to its unique electromagnetic properties and planar structure, it can conform to high-speed targets such as ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01Q15/23
Inventor 许河秀汤世伟马少杰蔡通孙树林周磊
Owner FUDAN UNIV
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