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Orbital Angular Momentum Generation Using Circular Ring Resonators in Radio Frequency |
| Fu-Chun Mao1, Ming Huang1**, Cheng-Fu Yang1, Ting-Hua Li2, Jia-Lin Zhang3, Si-Yu Chen1 |
1School of Information Science and Engineering, Yunnan University, Kunming 650091
2Center of China Tobacco Yunnan Industrial Co. Ltd. Kunming 65023
3Radio Monitoring Center of Yunnan Province, Kunming 650228
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| Cite this article: |
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Fu-Chun Mao, Ming Huang, Cheng-Fu Yang et al 2018 Chin. Phys. Lett. 35 020701 |
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Abstract Electromagnetic field generators based on circular ring resonators, whose perimeters are integer times of equivalent wavelength, are well known to have attractive potential for producing radio vortexes carrying orbital angular momentum (OAM). We study the radiation characteristics of the generators based on radiation vector and antenna array theory. The behaviors of radiation patterns, field intensity and phase distribution are investigated in detail, and show classical features of OAM beams. The evolution of the generators performance versus the OAM state is also analyzed. The proposed generators can be realized by all kinds of microwave transmission lines, verified by two different prototypes. The discussions and conclusions drawn in this study are useful and meaningful for the radio OAM generator design.
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Received: 31 October 2017
Published: 23 January 2018
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| PACS: |
07.57.Hm
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(Infrared, submillimeter wave, microwave, and radiowave sources)
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41.20.-q
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(Applied classical electromagnetism)
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42.50.Tx
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(Optical angular momentum and its quantum aspects)
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| Fund: Supported by the National Natural Science Foundation of China under Grant No 61461052, the Specialized Research Fund for the Doctoral Program of Higher Education under Grant No 20135301110003, the Seventh of Yunnan University Graduate Student Scientific Research Project under Grant No ynuy201443, and the Doctoral Award for the Academic Newcomers (2014) of Yunnan Province under Grant No C6155501. |
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