Journal of the Korean Society for Railway (한국철도학회논문집)

The Korean Society for Railway (한국철도학회)
권호 표지
DOI QR코드

DOI QR Code

Design of Beam-forming Reader Antenna for Train Position Detection using RFID

RFID 시스템 이용한 열차 위치검지용 빔폭 가변형 RFID 리더안테나

  • Received : 2015.02.03
  • Accepted : 2015.03.10
  • Published : 2015.04.30
Download PDF
⟨ Previous Next ⟩

Abstract

This paper presents a $4{\times}1$ beam-forming reader antenna system for a new type of RFID based train position detection technology. The required beamwidth of the reader antenna is analytically expressed for different train speeds. The proposed antenna system consists of four rectangular patch elements and two switching couplers which are designed, without any impedance matching networks, for two different antenna modes. The switching coupler is a rectangular quadrature coupler with Pin diodes connecting its center line and the ground plane. The beamwidth of the antenna when the diodes are off and on is $18^{\circ}$ and $39^{\circ}$, respectively. The proposed antenna system will be used for a real train test in the near future.

본 논문은 RFID기술기반의 새로운 저비용 고정밀 열차위치검지기술을 위하여 빔폭 가변형 $4{\times}1$ 리더안테나 시스템의 설계를 제안하였다. 또한, 열차 구간별 속도 변화에 따라 제안된 리더안테나의 요구되는 빔폭 계산을 수행하였다. 열차속도에 의한 제안된 안테나 시스템은 사각패치형태의 방사소자들을 스위칭 커플러를 이용하여 임피던스 변환없이 두개의 모드로 동작하도록 설계되었다. 스위칭 커플러는 사각 quadrature coupler의 중심선에 Pin Diode를 그라운드와 연결하여 다이오드의 ON/OFF 설정으로 빔폭 가변을 스위칭 하도록 하였다. 설계된 안테나는 다이오드 OFF에 $18^{\circ}$와 다이오드 ON에 $39^{\circ}$의 빔폭을 확인 하였다. 본 논문에서 설계된 리더안테나 시스템은 향후 실제 차량 시험을 통하여 철도환경에서 보다 정밀한 열차위치검지기술 확보를 위하여 유용하게 사용될 예정이다.

Keywords

References

  1. K.H. Shin, J.H. Lee (2012) Position Detection Technology in Railway Transportation, Journal of the Korean Society for Railway, 15(1), pp. 16-21.
  2. B.K. Cho, S.H. Ryu, J.H. Kim (2013) Train control system using RFID and WLAN, 2013 The Korean Institute of Communications and Information Sciences Summer Conference, Jeju, Korea, pp. 842-843.
  3. J.H. Kim, B.K. Cho, B.S. Lee, H.W. Lee, et al. (2013) Antenna Design for High Speed RFID system, Antennas and Propagation Society International Symposium 2013 IEEE, Orlando, USA, pp. 1738-1739.
  4. B.K. Cho, H.C. Hwang, J.H. Kim, and S.H. Ryu (2013) RFID System Response Test for Position Detection of 420km/h High-Speed Train, International Conference on ICT Convergence 2013, Jeju, Korea, pp. 972-973.
  5. S.H. Ryu, B.K. Cho, J.H. Kim (2013) Challenging-Research for Creating New Growth Engines, KRRI 2013-019, pp. 274-350.
  6. B.K. Cho (2014) RFID Antenna for Position Detection of Train, LNEE Vol. 309, pp. 903-908.
  7. C.H. Ahn, B.K. Cho, J.H. Kim, S.H. Ryu, et al. (2014) Beam-width Condition of RFID reader antenna for train location detection, 2014 Summer conference of the Korean Institute of Electromagnetic Engineering and Science, Jeju, Korea, pp. 281.
  8. C.H. Ahn, B.K. Cho, S.S. Oh, S.H. Ryu (2014) Train location detection using RFID technology, 2014 Fall conference of the Korean Society of Urban Railway, Seoul, Korea, pp. 213.
  9. C.H. Ahn, B.K. Cho, S.H. Ryu (2014) Optimizing train operations with RFID technology, 2014 Smart Rail congress.
  10. E.K. Lee, Y.M. Yoo, C.G. Park, M. Kim, et al. (2009) Installation and Evaluation of RFID Readers on Moving Vehicles, Proceedings of the sixth ACM international workshop on VANET working, Beijing, China, pp. 99-108.
  11. H.D. Chon, S. Jun, H. Jung, S.W. An (2004) Using RFID for Accurate Positioning, Journal of Global Positioning Systems, 3(1-2), pp. 32-39. https://doi.org/10.5081/jgps.3.1.32
  12. C. A. Balanis (2005) Antenna Theory: Analysis and Design, Wilely, pp. 94-104.
  13. ANSYS Designer, Ansys, 2014.
  14. D. M. Pozar (2011) Microwave Engineering, Wiley, 2(1), pp. 317-358.