Simple generation of orbital angular momentum modes with azimuthally deformed Cassegrain subreflector. Issue 19 (4th September 2015)

• Record Type: Journal Article
• Authors: Byun, Woo‐Jin; Lee, Young‐Seung; Kim, Bong Su; Kim, Kwang Seon; Kang, Min Soo; Cho, Yong Heui
• Is Part Of: Electronics letters. Volume 51:Issue 19(2015)
• Page Start: 1480
• Page End: 1482
• Publication Date: 2015-09-04
• Subjects: reflector antennas -- quadrature amplitude modulation -- near‐field communication -- microwave antennas; simple generation -- orbital angular momentum -- OAM modes -- azimuthally deformed Cassegrain subreflector -- parabolic reflector antenna -- Cassegrain subreflector -- size 15.6 mm -- frequency 15.1 GHz to 21.2 GHz -- gain 10 dB -- broadband low‐profile antenna -- feed reflection coefficients -- Near‐field transformed radiation phase -- far‐field transformed radiation phase -- near‐field range -- cassegrain dual reflector antenna -- generate arbitrary orbital angular momentum; Electronics -- Periodicals; 621.381
• DOI: 10.1049/el.2015.1833
• Languages: English
• ISSNs: 0013-5194

Abstract

Abstract : A parabolic reflector antenna with an azimuthally deformed Cassegrain subreflector is proposed to effectively generate arbitrary orbital angular momentum (OAM) modes. The Cassegrain dual‐reflector antenna was fabricated for 18 GHz and measured in the near‐field range. The near‐field to far‐field transformed radiation phase around a full azimuth shows that the proposed antenna generates fields with the l = 1 OAM mode. Simulated and measured feed reflection coefficients are below −10 dB for 15.1–21.2 GHz, even though the distance between a horn feed and a deformed subreflector is 15.6 mm, thus it is expected that the proposed structure can be used for a broadband low‐profile antenna.