Abstract
Implantable medical devices have been facing the severe challenge of wireless communication for a long time. Acoustically actuated magnetoelectric (ME) transducer antennas have attracted lots of attention due to their miniaturization, high radiation efficiency and easy integration. Here, we fully demonstrate the possibility of using only one bulk acoustic wave (BAW) actuated ME transducer antenna (BAW ME antenna) for communication by describing the correspondence between the BAW ME antenna and components of the traditional transmitter in detail. Specifically, we first demonstrate that the signal could be modulated by applying a direct current (DC) magnetic bias and exciting different resonance modes of the BAW ME antenna with frequencies ranging from medium frequency (MF) (1.5 MHz) to medium frequency (UHF) (2 GHz). Then, two methods of adjusting the radiation power of the BAW ME antenna are proposed to realize signal amplification, including increasing the input voltage and using higher order resonance. Finally, a method based on electromagnetic (EM) perturbation is presented to simulate the transmission process of the BAW ME antenna via the finite element analysis (FEA) model. The simulation results match the radiation pattern of magnetic dipoles perfectly, which verifies both the model and our purpose.
Highlights
Wireless implantable medical devices (IMDs) have sparked a new wave of research on biomedical technology [1,2,3]
From the perspective of the operating principle, the actuating source of the antenna is the bulk acoustic wave (BAW) resonator, and the radiation source is magnetostrictive film integrated on the resonator
The second method we propose is to increase the stress by using the higher order resonance characteristics of the BAW resonator, which is a solution that raises both the stress and the frequency
Summary
Si Chen 1,† , Junru Li 2, *,† , Yang Gao 1,3 , Jianbo Li 1 , Hongmei Dong 1 , Zhijun Gu 1 and Wanchun Ren 1. College of Optoelectronic Engineering, Chongqing University, Chongqing 400044, China. Robot Technology Used for Special Environment Key Laboratory of Sichuan Province, Mianyang 621010, China. Si Chen and Junru Li are co-first authors of this article
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