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IEEE/ICACT20220074 Slide.03        [Big Slide]	Oral Presentation
	Recently, wireless power transfer (WPT) to the IoT sensors wirelessly over the far distance has been attracted too much and this WPT system is based on the radio frequency (RF) antenna technology. In this paper, we propose an WPT system to multiple IoT sensor system using an electronically steerable parasitic array radiator (ESPAR) antenna based on microstrip patches. An ESPAR antenna design method and evaluation results for the WPT system are also presented. The WPT system is characterized by very low power transmission efficiency due to path loss of the RF signal. Therefore, the WPT system mainly utilizes a beamforming technique using multiple antennas to improve this characteristic. A phased array antenna is generally used for beamforming.

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