Dual-Band Transmitter for Wireless Power Transfer to Biomedical Implant Applications

초록

This letter presents a dual-band transmitter (DB-Tx) for wireless power transfer (WPT) to biomedical implants. The DB-Tx operates at $1.7\mathrm{GHz}$ (LF-band) and $2.1\mathrm{GHz}$ (HF-band) to power implantable devices in deep and shallow implantation, respectively. A bipolar concentric loop (BCL) radiating plane is employed to obtain field-focusing characteristics at dual frequencies, and hence enhance the power transfer efficiency (PTE). Furthermore, a wide-band implantable receiver (Rx) is implemented to verify DB-Tx's performance. Experimental results show that, by utilizing the DB-Tx, the transmission range can be extended three times in HF-band and 30% in LF-band, compared to the Tx operating at a single frequency band. The Rx can receive power with the PTE of $-14.7dB$ and $-23dB$ at $10\mathrm{mm}$ and $40\mathrm{mm}$ implantation depth, respectively. IEEE

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