Journal of electromagnetic engineering and science

  • 제16권4호
  • /
  • Pages.206-209
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  • 2016
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  • 2671-7255(pISSN)
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  • 2671-7263(eISSN)
한국전자파학회 (The Korean Institute of Electromagnetic Engineering and Science)
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A Reconfigurable Directional Coupler Using a Variable Impedance Mismatch Reflector for High Isolation

  • Lee, Han Lim (School of Electrical and Electronics Engineering, Chung-Ang University) ;
  • Park, Dong-Hoon (U-Tel Co. Ltd.) ;
  • Lee, Moon-Que (School of Electrical Engineering and Computer Science, University of Seoul)
  • 투고 : 2016.08.19
  • 심사 : 2016.09.26
  • 발행 : 2016.10.31
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초록

This letter proposes a reconfigurable directional coupler that uses a variable impedance mismatch reflector to achieve high isolation characteristics in the antenna front end. The reconfigurable coupler consists of a directional coupler and a single-pole four-throw (SP4T) switch with different load impedances as a variable load mismatch reflector. Selection of the load impedance by the reflector allows cancellation of the reflected signal due to antenna load mismatch and the leakage from the input to isolation port of the directional coupler, resulting in high isolation characteristics. The performance of the proposed architecture in separating the received (Rx) signal from the transmitted (Tx) signal in the antenna front end was verified by implementing and testing the reconfigurable coupler at 917 MHz for UHF radio-frequency identification (RFID) applications. The proposed reconfigurable directional coupler showed an improvement in the isolation characteristics of more than 20 dB at the operation frequency band.

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참고문헌

  1. W. G. Lim, S. Y. Park, W. I. Son, M. Q. Lee and J. W. Yu, "RFID reader front-end having robust Tx leakage canceller for load variation," IEEE Transactions on Microwave Theory and Techniques, vol. 57, no. 5, pp. 1348-1355, 2009. https://doi.org/10.1109/TMTT.2009.2017308
  2. P. Pursula, M. Kiviranta, and H. Seppa, "UHF RFID reader with reflected power canceller," IEEE Microwave and Wireless Components Letters, vol. 19, no. 1, pp. 48-50, 2009. https://doi.org/10.1109/LMWC.2008.2008607
  3. J. W. Jung, H. H. Roh, J. C. Kim, H. G. Kwak, M. S. Jeong, and J. S. Park, "Tx leakage cancellation via a micro controller and high Tx-to-Rx isolations covering an UHF RFID frequency band of 908-914 MHz," IEEE Microwave and Wireless Components Letters, vol. 18, no. 10, pp. 710-712, 2008. https://doi.org/10.1109/LMWC.2008.2003487
  4. W. K. Kim, W. Na, J. W. Yu, and M. Q. Lee, "A high isolated coupled-line passive circulator for UHF RFID reader," Microwave and Optical Technology Letters, vol. 50, no. 10, pp. 2597-2600, 2008. https://doi.org/10.1002/mop.23705