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The IoT's expansion calls for ultra-low power wireless systems. With 6G on the horizon, wireless energy harvesting backscatter paves the way for improved energy efficiency and enhanced connectivity, without conventional batteries and high-power radios. Despite licensed spectrum scarcity, the telecom industry explores deploying backscattering technology in licensed bands due to higher transmitter power and advanced interference management 1. Past research on RF energy harvesters emphasized enhancing the rectifier sensitivity for heavily duty-cycled applications but lacked the ultra-low power backscattering circuits 2–4. Others 5, 6 have advanced backscattering technology but sacrificed sensitivity and active communication power (10-30), burdening the wake-up charging time at low (available power levels. This is especially critical in IoT-enabled warehouses where swift inventory counting is essential (Fig. 1 top) with broad coverage. Furthermore, the form factor should be minimized to validate the batteryless harvesters. The pursuit, therefore, continues to design a comprehensive system running at higher 5G frequencies (hence lower form-factor) that combines high sensitivity, simple backscattering communication and thus, low start-up times.
Yıldırım et al. (Sun,) studied this question.
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