Flexural Vibration Magnetoelectric Antenna for Medium Frequency and High Frequency

Abstract

High-frequency (HF) and medium frequency (MF) antennas are an important part of modern wireless communication systems. However, the extremely large size of small electric antennas in these bands limits the range of applications of wireless communication systems, especially in implantable devices and the Internet of Things (IoT). In this article, a Microscale Flexible Vibration-Magnetoelectric (FV-ME) antenna with resonant frequencies at MF or HF is proposed. At MF or HF, the size of FV-ME is smaller than that of Magnetoelectric (ME) antennas based on other driving modes. The coupling mechanism of the FV-ME antenna is analyzed using an equivalent circuit. The equivalent circuit is formed by adding a force-magnetic coupling coefficient to the equivalent circuit of a piezoelectric micromechanical ultrasonic transducer, which is derived by the energy method. The effects of material coverage, thickness ratio, modulus ratio and acoustic radiation on the ME coefficient of the FV-ME were evaluated. These results show that ME antennas based on bending vibration modes can operate at intermediate or high frequencies. Furthermore, the FV-ME antenna having a diameter of hundreds of microns is significantly smaller than other MF or HF antennas.