Abstract
Ultra-compact wireless implantable medical devices are in great demand for healthcare applications, in particular for neural recording and stimulation. Current implantable technologies based on miniaturized micro-coils suffer from low wireless power transfer efficiency (PTE) and are not always compliant with the specific absorption rate imposed by the Federal Communications Commission. Moreover, current implantable devices are reliant on differential recording of voltage or current across space and require direct contact between electrode and tissue. Here, we show an ultra-compact dual-band smart nanoelectromechanical systems magnetoelectric (ME) antenna with a size of 250 × 174 µm2 that can efficiently perform wireless energy harvesting and sense ultra-small magnetic fields. The proposed ME antenna has a wireless PTE 1–2 orders of magnitude higher than any other reported miniaturized micro-coil, allowing the wireless IMDs to be compliant with the SAR limit. Furthermore, the antenna’s magnetic field detectivity of 300–500 pT allows the IMDs to record neural magnetic fields.
Highlights
Ultra-compact wireless implantable medical devices are in great demand for healthcare applications, in particular for neural recording and stimulation
The ME antenna is based on ME film bulk acoustic wave resonator (FBAR) working at 2.5 GHz; while the ME sensor is based on a ME contour mode resonator (CMR) with interdigitated electrode and an operation frequency of 215 MHz
In this work we present smart ME antenna with unprecedented characteristics that are ideal for implantable medical devices (IMDs): (1) ultra-compact antenna for highly efficient wireless power transfer efficiency and data communication at GHz; (2) ultra-sensitive magnetometer capable of sensing picoTesla low-frequency fields by using MHz resonance; and (3) simultaneous operation at two different frequency bands, GHz for wireless power transfer and data communication, and MHz for magnetic field sensing
Summary
Ultra-compact wireless implantable medical devices are in great demand for healthcare applications, in particular for neural recording and stimulation. It will be shown that thickness and width modes of smart ME antenna exhibit a high performance while harvesting the RF energy and sensing magnetic fields, respectively —functionalities that can be utilized in ultra-miniaturized brain and body implantable devices and wearable technologies.
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