Journal
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
Volume 64, Issue 2, Pages 401-413Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TMTT.2016.2515586
Keywords
Communication; power transmission; RF communications; RF identification (RFID); wireless communication systems; wireless RF components and systems
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We present the theory of high-order modulation for near-field RF identification (RFID) and wireless power transfer (WPT) systems. We show that while related, the design of RFID and WPT systems differ. The theory and calculation of load modulated quadrature amplitude modulation (QAM) and phase shift keying (PSK) is presented. We then present two experimental prototypes. The first demonstrates a 16-QAM RFID link achieving > 480 kb/s at a 2.38-MHz carrier (> 19.8 fractional bandwidth), significantly higher than the < 1 fractional bandwidth of traditional RFID systems. The second experimental prototype demonstrates 4-PSK for WPT applications achieving a data rate > 256 kb/s at a 2.38-MHz carrier (a 10.7% fractional bandwidth) with an average efficiency reduction of only 4%.
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