Harmonic suppression metasurface energy collector

Abstract

The invention relates to a harmonic suppression metasurface energy collector which is characterized by comprising a metasurface unit layer, a grounding layer and a radio frequency output layer which are sequentially arranged from top to bottom, wherein a plurality of metasurface units are periodically arranged on the metasurface unit layer; the metasurface units are the same in structure, and each metasurface unit comprises a dielectric substrate and a metal layer arranged on the dielectric substrate; umbrella-hook-shaped groove structures used for achieving incident wave absorption and L-shaped groove structures used for achieving harmonic suppression are etched on the metal layer; a vertical conductive through hole penetrating through the metasurface unit layer is formed in each umbrella-hook-shaped groove structure, and each metasurface unit is connected with a feed network arranged on the radio frequency output layer after passing through the grounding layer through each conductive through hole, and the collected radio frequency energy is transmitted to the feed network for radio frequency synthesis, so that all energy is converged to one place to be exported. The harmonic suppression metasurface energy collector can be widely applied to the field of rectification antenna design.

Description

technical field [0001] The invention relates to a harmonic suppression metasurface energy collector, which belongs to the field of microwave energy transmission and reception rectifying antennas. Background technique [0002] In the microwave wireless power transfer system (MPT), the rectenna is the key device for converting microwave energy to DC, and it is also an important factor determining the RF-DC energy conversion efficiency of the MPT system. The rectenna is composed of a receiving antenna and a rectifying circuit. The high-order harmonics generated by nonlinear elements such as diodes in the rectifying circuit will be radiated twice by the receiving antenna, which will reduce the efficiency of the rectenna and seriously affect the transmission efficiency of the system. It will cause electromagnetic interference between systems. Therefore, rectifying antenna harmonic suppression technology should focus on solving. On the other hand, in order to avoid destructive c...

AI Technical Summary

Problems solved by technology

In principle, the insertion loss caused by the low-pass filter and the performance impact of the antenna are removed; however, the feed structure of the rectenna uses an open parallel open-circuit stub to suppress harmonics, which is ideal for a single or miniaturized array Effectively, when radio frequency synthesis is used in a large-scale array, the additional space occupied by the stubs on the feeder will affect the design of the feeder network and add additional difficulties to the design of the antenna array

In addition, the traditional patch antenna array is used as the receiving antenna. In order to avoid destructive coupling between units, the antenna array needs to be separated by half a wavelength. Effective solution for miniaturization and high efficiency

At present, most metasurfaces for energy harvesting focus on high-efficiency capture, multi-polarization, and wide incident angles. There is no proposal in the published literature to propose how to solve the harmonic suppression problem of the receiving system on the metasurface.

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