Inductively coupled small self resonant coil (SSRC) reader antennas for HF RFID applications |
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| Affiliation: | 1. School of Electrical and Electronic Engineering, Newcastle University, 62 Stebbing house, 5 Queensdale Crescent, W11 4TE London, United Kingdom;2. Institute for Communication Systems (ICS), Faculty of Engineering and Physical Sciences, University of Surrey, Guildford, Surrey GU2 7XH, United Kingdom;1. Beijing Key Laboratory of High Dynamic Navigation Technology, Beijing Information Science & Technological University, Beijing 100101, China;2. School of Automation, Beijing Institute of Technology, Beijing 100081, China;1. KU Leuven, Dept. of Electrical Engineering, MICAS, Kasteelpark Arenberg 10, 3001 Leuven, Belgium;2. KU Leuven, Laboratory of Experimental Urology, Herestraat 49, 3000 Leuven, Belgium;3. Department of Urology, Airlangga University School of Medicine, Dr Soetomo General Hospital, Surabaya, Indonesia;1. Department of Chemistry, The College of William & Mary, Williamsburg, VA, USA;2. Department of Applied Science, The College of William & Mary, Williamsburg, VA, USA |
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| Abstract: | A new model of inductively coupled high frequency radio frequency identification (HF RFID) reader antennas is presented in this paper based on the idea of using the self resonance frequency (SRF) of a small multi turn coil. The introduced multi turn small self resonant coil (MT SSRC) antenna is mathematically analyzed in terms of SRF, number of turns, dimensions and dielectric characteristics of the insulation, where present. Based on the analysis, a compact planar version of MT SSRC antennas having two turns, the two turn planar SSRC (TTP SSRC), is investigated and the dependency of the SRF to the antenna dimension is observed. A TTP SSRC antenna operating at 13.56 MHz is fabricated and is compared with an old model of HF RFID antennas; an optimized Q factor and a more uniform near field pattern is obtained for the new antenna. The benefits of the obtained optimized Q factor and uniform near pattern is explained for smart shelf application. Also, a number of TTP SSRC antennas operating at a distinct frequency, 13.56 MHz here, are fabricated on different substrates and it is shown that the Q factor and dimension of the TTP SSRC antenna could be controlled and adjusted based on the dielectric characteristics of the substrate. The new antenna prototype has a beneficial application to smart shelf applications in HF RFID. |
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