ETRI Journal

  • 제39권3호
  • /
  • Pages.336-344
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  • 2017
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  • 1225-6463(pISSN)
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  • 2233-7326(eISSN)
한국전자통신연구원 (Electronics and Telecommunications Research Institute)
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Microwave Orbital Angular Momentum Mode Generation and Multiplexing Using a Waveguide Butler Matrix

  • Lee, Wangjoo (Broadcasting & Media Research Laboratory, ETRI) ;
  • Hong, Ju Yeon (Broadcasting & Media Research Laboratory, ETRI) ;
  • Kang, Min Soo (Broadcasting & Media Research Laboratory, ETRI) ;
  • Kim, Bong Su (Broadcasting & Media Research Laboratory, ETRI) ;
  • Kim, Kwang Seon (Broadcasting & Media Research Laboratory, ETRI) ;
  • Byun, Woo Jin (Broadcasting & Media Research Laboratory, ETRI) ;
  • Song, Myung Sun (Broadcasting & Media Research Laboratory, ETRI) ;
  • Cho, Yong Heui (School of Information and Communication Engineering, Mokwon University)
  • 투고 : 2015.12.31
  • 심사 : 2017.02.27
  • 발행 : 2017.06.01
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초록

In this paper, we propose a convenient microwave orbital angular momentum (OAM) mode generation and multiplexing method operating in the 18 GHz frequency band, based on a $2{\times}2$ uniform circular array and a $4{\times}4$ Butler matrix. The three OAM modes -1, 0, and +1 were generated and verified using spatial S-parameter measurements; the measured back-to-back mode isolation was greater than 17 dB in the full 17 GHz to 19 GHz range. However, the radiated OAM beam centers were slightly dislocated and varied with both frequency and the mode index, because of the non-ideal characteristics of the Butler matrix. This resulted in mode isolation degradation and transmission distance limitations.

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참고문헌

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피인용 문헌

  1. Analog Eigenmode Transmission for Short-Range MIMO Based on Orbital Angular Momentum vol.65, pp.12, 2017, https://doi.org/10.1109/tap.2017.2742582
  2. Evaluation of the Laguerre–Gaussian mode purity produced by three-dimensional-printed microwave spiral phase plates vol.7, pp.7, 2017, https://doi.org/10.1098/rsos.200493