Near-field sparse antenna array optimization method based on L1 norm constraint

Abstract

The invention provides a near-field sparse antenna array optimization method based on L1 norm constraint, which comprises the following steps: 1. determining the index parameters of the needed near-field sparse antenna array pattern; 2. determining the index parameters of the near-field sparse antenna array pattern. 2, using the L1 norm constraint theory to carry out iterative solution on the array element position and corresponding excitation; 3, normalizing the array excitation obtained by each iteration, and calculating the number of array elements whose excitation amplitude is greater thana given value; 4, judging whether that numb of units of three successive iterations is equal, if equal, the algorithm converges to obtain the final array topology and corresponding excitation. The invention obtains the sparse near-field antenna array topology and corresponding excitation based on the L1 norm minimization. Compared with the traditional method, the sidelobe level is controllable, and the problem of focus shift in the near-field focusing technology is solved at the same time.

Description

technical field [0001] The invention belongs to the technical field of antennas, in particular to a method for forming a pattern of a sparse near-field antenna array, in particular to a method for forming a pattern of a pattern of a sparse near-field antenna array based on L1 norm constraints. Background technique [0002] Due to the wide application range of beamforming in the radiative near-field region, the beamforming technology in the radiative near-field region has received more and more attention. Its specific applications cover various fields such as industry and medicine, including microwave imaging, remote sensing, wireless energy transmission, radio frequency identification, microwave hyperthermia, etc. Generally speaking, if you want to have better near-field radiation characteristics, such as smaller focal spot size, lower sidelobes, and near-field beam formation with responsible shape, it means that you need a larger aperture and more antennas An antenna array...

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Problems solved by technology

[0005] The present invention aims at the problem that the above-mentioned existing near-field sparse antenna array optimization algorithm cannot accurately control the sidelobe level of the radiation near-field pattern, and the traditional method will cause focus shift, and proposes a method based on L1 norm constraints Near-field sparse antenna array optimization method based on

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