Miniaturized resonant structure for wireless power transfer system based on high‐Q bulk acoustic resonator

A novel high‐Q resonant structure comprising the bulk acoustic resonator (BAR) and inductive loop is proposed to be used for wireless power transmission system. The proposed resonant structure operating at MHz frequency range has significantly miniature size in relation to the electrical wavelength (<λ/100) that could be attractive in the field of biology and medicine applications. The efficiency of the wireless power transfer system consisting of ordinary transmitting loop and proposed resonant structure with diameter of 6 mm based on high‐Q BAR has been estimated as higher than 60% at the distance 10 mm. © 2014 Wiley Periodicals, Inc. Microwave Opt Technol Lett 56:531–535, 2014