Improved point focusing field-based spatial electromagnetic field shaping system and method

Abstract

The invention discloses an improved point focusing field-based spatial electromagnetic field shaping system and method and belongs to the field of electromagnetic wave radio propagation and control. The method comprises the steps of firstly, dividing a shaped area into a plurality of subareas, placing beacon antennas into the subareas and characterizing electromagnetic field distribution in the shaped area by using receiving signals of the beacon antennas; obtaining excitation signals of improved point focusing fields through calculating a pseudo-inverse of a channel matrix of the beacon antennas and a transmitting antenna array, and superposing the excitation signals as the excitation signals of shaped fields; in order to lower a side lobe, optimizing receiving phases of the beacon antennas in different subareas to obtain an optimum excitation signal; and finally feeding the optimum excitation signal into the transmitting antenna array through a feed network, thereby achieving shapingof a spatial electromagnetic field. According to the improved point focusing field-based spatial electromagnetic field shaping system and method, the problems, such as low field intensity control precision, a relatively large side lobe outside the shaped area and a large number of optimization variables can be solved, and a side lobe field outside the shaped area can also be effectively reduced while accurate shaping of the electromagnetic field is quickly and effectively achieved.

Description

technical field [0001] The invention belongs to the field of electromagnetic wave space propagation and control, and in particular relates to a space electromagnetic field forming system and method based on an improved point focusing field. Background technique [0002] Space electromagnetic field shaping refers to the space shaping of the electromagnetic field, which means that the electromagnetic waves radiated by the antenna array form a specific field intensity distribution at the spatial position. Different from beamforming, space electromagnetic field forming no longer cares about the distribution of the antenna array radiation far field in the angular domain, but focuses on the electromagnetic field distribution in a specified area within a limited space range. [0003] The potential application scenarios of space electromagnetic field shaping are relatively extensive, such as microwave hyperthermia, wireless energy transmission, microwave heating, microwave cutting, ...

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Problems solved by technology

[0007] In order to solve the problems of low field strength control accuracy in the shaping area, larger sidelobes outside the shaping area, and more optimization variables in the shaping of the space electromagnetic field, the present invention proposes a space electromagnetic field based on an improved point focus field. Shaping systems and methods

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