Influence of Mass Loading Effect on Radiation Quality Factor of BAW Magnetoelectric Antenna

Stacked piezomagnetic/piezoelectric heterostructure have attracted wide attention in antenna community for their potential application in a subminiature device, and the number of layers has a significant influence on the performance of antenna especially when considering the mass loading effect. However, its physical essence and device structure optimization still keep unidentified. Therefore, the analytical models of energy and radiated power for bulk acoustic wave magnetoelectric (BAW ME) antenna were constructed respectively to derive the corresponding analytic results of stacked structures with 2 to 6-layer under the conditions of fixed thickness of unit layer and resonant frequency respectively. The calculation data shows that the 2-layer and 3-layer structures enjoy the optimal radiation quality factor respectively when the thickness of unit layer or resonant frequency is fixed. The finite element analysis is exploited to simulate the stress field distribution of the stacked layers, which reveals the physical essence of BAW ME antenna with different radiation quality factor. Furthermore, the analytical models are validated by the numerical results.