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Journal Article Microwave Orbital Angular Momentum Mode Generation and Multiplexing Using a Waveguide Butler Matrix
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Authors
Wangjoo Lee, Ju Yeon Hong, Min Soo Kang, Bong Su Kim, Kwang Seon Kim, Woo Jin Byun, Myung Sun Song, Yong Heui Cho
Issue Date
2017-06
Citation
ETRI Journal, v.39, no.3, pp.336-344
ISSN
1225-6463
Publisher
한국전자통신연구원 (ETRI)
Language
English
Type
Journal Article
DOI
https://dx.doi.org/10.4218/etrij.17.0115.1100
Project Code
15MR3700, Development of core technologies to improve spectral efficiency for mobile big-bang, Choi Hyung Do
Abstract
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 × 2 uniform circular array and a 4 × 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.
KSP Keywords
17 GHz, 18 GHz, GHz range, Mode isolation, Non-ideal, OAM modes, Orbital angular momentum mode, S-parameter measurement, Transmission distance, back-to-back, butler matrix
This work is distributed under the term of Korea Open Government License (KOGL)
(Type 4: : Type 1 + Commercial Use Prohibition+Change Prohibition)
Type 4: