調整、充電：RF能量收集顯示它的潛力

　　在當今無線互聯的世界中，環境射頻能量無處不在。從技術上講，這種自由流動的能量可以被捕獲、轉換和儲存，以便在其他應用中使用。事實上，它已經在一些超低功耗，無電池的應用，如RFID標簽，非接觸式智能卡，無線傳感器網絡中使用。由于技術的進步，獲得的RF能源剛剛開始實現其更大的潛力，包括在智能手機和其他便攜式設備中充電電池。這些使能技術包括射頻收發器、電源轉換電路和超低功耗微控制器，所有這些都變得越來越高效。

　　Figure 1： Nokia has been researching wireless recharging technology， including RF energy harvesting， since 2009.

　　This article reviews the state-of-the-art of RF energy harvesting， current and emerging applications， and considers some of the recent product introductions in this sector. These include energy harvesting development kits that support RF energy harvesting， such as the M24LR EEPROM with RF interface， and associated Discovery evaluation kit fromSTMicroelectronics; XLP 8-bit and 16-bit microcontroller-based energy harvesting development kits from Microchip; and a range of RFID devices and development kits from Texas Instruments， based on the MSP430 range of ultra low power microcontrollers.