| Title: | An Enhanced Multiplication of RF Energy Harvesting Efficiency Using Relay Resonator for Food Monitoring |
| Address: | "Department of Electronic Engineering, Pukyong National University, Busan 608-737, Korea. tuxuancao@pukyong.ac.kr. Department of Electronic Engineering, Pukyong National University, Busan 608-737, Korea. wychung@pknu.ac.kr" |
| ISSN/ISBN: | 1424-8220 (Electronic) 1424-8220 (Linking) |
| Abstract: | "Recently, radio frequency (RF) energy harvesting (RFEH) has become a promising technology for a battery-less sensor module. The ambient RF radiation from the available sources is captured by receiver antennas and converted to electrical energy, which is used to supply smart sensor modules. In this paper, an enhanced method to improve the efficiency of the RFEH system using strongly coupled electromagnetic resonance technology was proposed. A relay resonator was added between the reader and tag antennas to improve the wireless power transmission efficiency to the sensor module. The design of the relay resonator was based on the resonant technique and near-field magnetic coupling concept to improve the communication distance and the power supply for a sensor module. It was designed such that the self-resonant frequencies of the reader antenna, tag antenna, and the relay resonator are synchronous at the HF frequency (13.56MHz). The proposed method was analyzed using Thevenin equivalent circuit, simulated and experimental validated to evaluate its performance. The experimental results showed that the proposed harvesting method is able to generate a great higher power up to 10 times than that provided by conventional harvesting methods without a relay resonator. Moreover, as an empirical feasibility test of the proposed RF energy harvesting device, a smart sensor module which is placed inside a meat box was developed. It was utilized to collect vital data, including temperature, relative humidity and gas concentration, to monitor the freshness of meat. Overall, by exploiting relay resonator, the proposed smart sensor tag could continuously monitor meat freshness without any batteries at the innovative maximum distance of approximately 50 cm" |
| Keywords: | Food Analysis/instrumentation/*methods Gases/analysis Humidity Meat/analysis *Radio Waves Temperature Volatile Organic Compounds/analysis Wireless Technology battery-less sensor tag equivalent carbon dioxide sensor meat freshness monitoring relay resonato; |
| Notes: | "MedlineCao, Xuan-Tu Chung, Wan-Young eng 2016R1A2B4015/Mid-career Research Program through NRF (National Research Foundation) grant funded by MSIT (Ministry of Science and ICT) in Korea/ Switzerland 2019/04/28 Sensors (Basel). 2019 Apr 26; 19(9):1963. doi: 10.3390/s19091963" |
