開催日時	2024/09/11
所内担当者	Andrey S. Andrenko

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https://us02web.zoom.us/meeting/register/tZ0lcOqhqTksE9dmHU3HGDkd8UOvdi6fJ18f

Abstract

One practical example of the radiative wireless power transfer (WPT) is the passive radio frequency identification (RFID) technology which has matured and became an indispensable tool in a variety of applications, such as security, retail tracking,counterfeit prevention, and healthcare. The operation of UHF(916-920 MHz) RFID systems is based on the activation of RFID tags by the EM field produced by the reader antenna so that an accurate wave-front characterization plays an important role in improving the system reliability and data capacity. This talk will present the design of planar UHF RFID antennas for the so-called smart shelf applications. The concept of the quasi-circular polarization (CP) in the near-field zone will be analyzed and illustrated by the E-field distribution of the proposed antennas.Next, application of the proposed antennas for radiative near field WPT system will be discussed. It will be shown how the polarization control of the quasi- CP E-field is provided so that all receiving devices oriented randomly in the plane parallel to transmitter antenna can be charged. Thus, it reduces the so-called RF energy pollution and minimizes human exposure to radiated energy by limiting the charging volume.

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29 August, 2024