調(diào)整、充電：RF能量收集顯示它的潛力

　　在當(dāng)今無(wú)線互聯(lián)的世界中，環(huán)境射頻能量無(wú)處不在。從技術(shù)上講，這種自由流動(dòng)的能量可以被捕獲、轉(zhuǎn)換和儲(chǔ)存，以便在其他應(yīng)用中使用。事實(shí)上，它已經(jīng)在一些超低功耗，無(wú)電池的應(yīng)用，如RFID標(biāo)簽，非接觸式智能卡，無(wú)線傳感器網(wǎng)絡(luò)中使用。由于技術(shù)的進(jìn)步，獲得的RF能源剛剛開(kāi)始實(shí)現(xiàn)其更大的潛力，包括在智能手機(jī)和其他便攜式設(shè)備中充電電池。這些使能技術(shù)包括射頻收發(fā)器、電源轉(zhuǎn)換電路和超低功耗微控制器，所有這些都變得越來(lái)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.