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http://dx.doi.org/10.4218/etrij.17.0115.1100

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)
Publication Information
ETRI Journal / v.39, no.3, 2017 , pp. 336-344 More about this Journal
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 $2{\times}2$ 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.
Keywords
Orbital angular momentum; Mode multiplexing; 18 GHz; Butler matrix; Beam center mismatch; Mode isolation;
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