Data Transmission Using Original Coils in Resonant Wireless Power Transmission

Takashi MARUYAMA  Tatsuya SHIMIZU  Mamoru AKIMOTO  Kazuki MARUTA  

Publication
IEICE TRANSACTIONS on Communications   Vol.E94-B   No.11   pp.3172-3174
Publication Date: 2011/11/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E94.B.3172
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Wireless Communication Technologies
Keyword: 
resonant wireless power transmission,  data transmission,  load modulation,  equivalent circuit,  

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Summary: 
We propose a data transmission method for resonant wireless power transmission systems. In order to transmit data, we use the coils originally designed for power transmission, no additional antennas are required. We focus on uplink data transmission and adopt the load modulation technique. This configuration yields mid-range data transmission without transmitting power. In addition, the proposal enables simultaneous power feeding and uplink data transmission. We make a prototype demonstrating resonant wireless power transmission and measure its S-parameter under some load conditions. The results confirm the potential of load modulation in supporting uplink data transmission. Additionally, the results are elucidated by analyzing an equivalent circuit. Measured S-parameter and equivalent circuit response are found to be similar.