A VLF Resonant Antenna Based on Piezoelectric Ceramics

A very low frequency (VLF) resonant antenna based on piezoelectric ceramics is proposed in this paper. Combined with Maxwell's equations, electrostatic equations and piezoelectric constitutive equations, COMSOL Multiphysics is used to coupling structural mechanics, electrostatics and electromagnetic waves. A disk resonant antenna with a radius of 50mm, a thickness of 6mm and an operating frequency of 90.5 kHz is designed using piezoelectric ceramics (PZT-5H) as the material. The simulation results show that the radiation characteristics of the antenna become stronger with the increase of the boundary load applied on the upper surface of the piezoelectric disk. The number of parallel antennas will also enhance its radiation characteristics and achieve the matching between the antenna and the feed. In addition, the disk resonant antenna can be equivalent to a dipole antenna [4]. Compared with the electrically small antenna of the same size, it can achieve high efficiency and miniaturization without loading complex matching circuit.