Multi-block electret-based mechanical antenna model for low frequency communication

In an LF/VLF transmission system, the performance of the antenna is of great importance to the entire system. Currently, the electret-based mechanical LF/VLF antenna uses mechanical movement to accelerate electret charges to produce LF/VLF electromagnetic waves, and the frequency of these electromagnetic waves is limited by the rotation speed of the actuating motor. Based on research that addressed the relationship between antenna structure and electromagnetic wave frequency, this paper — in order to increase the frequency of electromagnetic waves — alters the charge distribution mode of the mechanical antenna while keeping the motor’s rotational speed constant to realize an increase of transmission signal frequency. The effectiveness of this method was verified by model simulation.