Figure 2

Direct and wireless actuation of both Devices A and B at fixed angles and distances is compared to demonstrate the wireless energy transfer (actuation) of two separate piezoelectric devices. (a) The response of Device A excited and measured by a direct excitation via the VNA, as depicted in the inset schematic, is shown. The resonance peak appears at 121.7 MHz. (b) The response of device B excited and measured by a vector network analyzer, with a resonance peak at 36.18 MHz. (c) Response of Device A excited wirelessly as depicted in the inset schematic. As expected, a similar resonance response is detected for wireless actuation of the resonator. (d) Resonance response of Device B excited wirelessly also occurs at exactly the same resonance frequency of 36.18 MHz; however, the magnitude of the response is much smaller. VNA, vector network analyzer.