Abstract:
Objectives It aims to propose an innovative beamforming method to achieve high-efficiency harmonic adaptive beamforming through multi-mode single sideband time modulation technology.
Methods A multi-mode single sideband time modulation module containing absorption states is designed. The on and off of the absorption state of the control module are used to achieve weighted control of the equivalent amplitude of each channel. Based on the classic adaptive beamforming algorithm, the corresponding periodic control timing is derived to achieve efficient adaptive beamforming of harmonics.
Results The feasibility of the system is verified by numerical simulation. A harmonic beamforming system including an antenna, a modulation module and a control module is fabricated in the 5 GHz frequency band. Experiments show that the main beam scanning angle error is within 1° and the null angle error is within 3.5°.
Conclusions The proposed system can achieve adaptive beamforming of harmonic beams through a single radio frequency channel, and has the advantages of simple structure and low cost.
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