Abstract: The size of traditional electric antenna is proportional to the transmitted wavelength. Although the low-frequency electromagnetic wave (30 ~ 300 kHz) reaches several kilometers, the low-frequency electric antenna has some problems, such as excessively large size, poor concealment and high power consumption. To solve the problems of large size and power consumption of electrical antenna and improve the flexibility of low-frequency wireless communication applications, a mechanical antenna based on piezoelectric effect is proposed. Mechanical antenna generates electromagnetic waves by direct excitation of mechanical motion charges. The physical mechanism of the piezoelectric mechanical antenna is studied. The impedance characteristics of piezoelectric mechanical antenna are studied by impedance frequency curve. The low-frequency radiation performances of piezoelectric mechanical antennas with various side lengths are compared by using a wireless communication system. Meanwhile, the magnetic field radiated by piezoelectric mechanical antenna changes with the distance between the receiving end of wireless communication system and piezoelectric mechanical antenna, and its variation law is verified. The result shows that the piezoelectric mechanical antenna has great potential in portable, low-cost and high-performance low-frequency wireless communication applications.

Key words: piezoelectric, mechanical antenna, wireless communication, low-frequency