As a super-low frequency communication technology

mechanical antenna is a new research field attracting international attention. It has a wide application prospect in long-distance communication and underwater communication. In order to realize the miniaturization and low power consumption of the super-low frequency mechanical antenna

the structure and communication model of the rotating dipole type mechanical antenna are proposed. In view of the proposed communication topology and the radiation intensity of communication signals

a three-axis orthogonal coil is developed as a signal receiving unit. A sensitivity normalized characterization method based on the ratio of thermal noise voltage to induced voltage is proposed. The sensitivity and working condition of the developed coil are tested. The experimental results show that the sensitivity theoretical model can be used in the design of high sensitivity coils and the hollow coil developed can be used in the reception of mechanical antenna signals. The presence of iron products affects the receiving performance of coils. The experimental study provides a theoretical reference for the optimal design of the receiving coil of super-low frequency mechanical antenna.