Planar array near-field multipoint focusing system and method based on time reversal

A planar array and time-reversal technology, applied in transmission systems, radio transmission systems, microwave therapy, etc., can solve problems such as inability to focus, low optimization rate, and inability to meet high-efficiency requirements, so as to reduce the number of optimization iterations and speed up optimization process, the effect of reducing redundancy
CN110649945AActive Publication Date: 2020-01-03UNIV OF ELECTRONIC SCI & TECH OF CHINA
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
UNIV OF ELECTRONIC SCI & TECH OF CHINA
Publication Date
2020-01-03

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Abstract

The invention discloses a planar array near-field multipoint focusing system and method based on time reversal, and relates to the field of electromagnetic wave regulation and control. The planar array near-field multipoint focusing system comprises a signal generator for generating a channel detection signal, a transmitting module which is used for receiving the detection signal and transmittinga TRM return signal, a control module which is used for regulating and controlling the return signal, and a focusing module which transmits a detection signal. According to the planar array near-fieldmultipoint focusing system, SVD decomposition is utilized to represent a focusing field receiving signal as linear superposition of a plurality of orthogonal sub-signals so as to avoid redundancy caused by superposition of non-orthogonal signals; through threshold discrimination, a part of sub-channels are discarded, and the number of optimization variables is reduced, and the optimization speedis increased; a power fluctuation threshold is set to improve the transmission efficiency; and the energy ratio of each focus point is regulated and controlled by changing the power distribution ratio. Multi-point focusing can be generated in a near field with extremely uneven electromagnetic field intensity distribution according to a preset energy ratio, and the problems of microwave thermal therapy and multi-target selective wireless energy transmission can be effectively solved.
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Description

technical field

[0001] The invention belongs to the field of space propagation and control of electromagnetic waves, and in particular relates to a planar array near-field multi-point focusing system and method based on time inversion. Background technique

[0002] With the continuous expansion of the application range of electromagnetic waves, for example, microwave hyperthermia, biological effect research, wireless energy transmission, encrypted communication, microwave cutting, etc., these applications all require the ability to precisely focus electromagnetic waves at a fixed position for Act on a specific object. In the field of electromagnetism, there are a lot of researches on the propagation and regulation of electromagnetic waves.

[0003] Among them, beamforming is to make the radiation pattern of the far-field area of ​​the antenna array into a specific beam by rationally designing the excitation amplitude and phase of each array element of the antenna array, the...

Claims

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