A frequency-tunable ultra-low frequency mechanical antenna structure

Abstract

The invention discloses a frequency-adjustable ultra-low frequency mechanical antenna structure, belonging to the technical field of ultra-low frequency communication. The antenna structure comprises a static magnetic field generating module for generating a static magnetic field and a cutting static magnetic field generating module for cutting the static magnetic field generating module to generate a time-varying electromagnetic field. The magnetic field module, the static magnetic field generation module includes a motor, a plurality of permanent magnets, a fixed rotating motor and a support frame of the plurality of permanent magnets; the support frame is arranged outside the motor; the plurality of permanent magnets are evenly arranged on the outer surface of the support frame, cutting The static magnetic field module includes a disc, a disc with sawtooth, and a control switch that controls the change of the sawtooth length of the disc and drives the movement of the disc. The number of teeth of the sawtooth disc is the ratio of the frequency of the time-varying magnetic field to the operating frequency of the rotating motor. The movement mode, while minimizing the weakening of the magnetic induction intensity, increases the frequency of electromagnetic waves generated by the mechanical antenna to meet the frequency requirements during the transmission process.

Description

technical field [0001] The invention relates to the technical field of ultra-low frequency communication, in particular to a frequency-adjustable ultra-low frequency mechanical antenna structure. Background technique [0002] In September 2017, the U.S. DARPA (U.S. Defense Advanced Research Projects Agency) launched a 45-month "Mechanical Antenna" program, which intends to drive electret or permanent magnet materials to generate radio frequency signals for propagation through mechanical devices. This method can greatly reduce the volume and power consumption of the transmitting antenna of the low-frequency navigation communication system, and realize the major transformation and subversive innovation of the radio transmitting system. Seek to use the advantages of ultra-low frequency (SLF) radio waves to achieve strategic ultra-long-range, penetrating communication to overcome the shortcomings of traditional antenna communication methods such as too large infrastructure and l...

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Problems solved by technology

[0005] At present, on the basis of solving the problem of large volume of the existing ultra-low frequency, in order to further solve the problem that the frequency of the electromagnetic wave excited by the mechanical antenna is limited by the speed of the motor, the frequency of the electromagnetic wave cannot meet the frequency requirements in actual communication. The present invention discloses a frequency-adjustable ultra-low frequency Mechanical antenna structure, a frequency-adjustable ultra-low frequency mechanical antenna structure, including a static magnetic field generating module that generates a static magnetic field and a cutting static magnetic field module that cuts the static magnetic field generating module to generate an electromagnetic field that varies with time

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