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Simple generation of orbital angular momentum modes with azimuthally deformed Cassegrain subreflector
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- Authors
- Woo-Jin Byun, Young-Seung Lee, Bong Su Kim, Kwang Seon Kim, Min Soo Kang, Yong Heui Cho
- Issue Date
- 2015-09
- Citation
- Electronics Letters, v.51, no.19, pp.1480-1482
- ISSN
- 0013-5194
- Publisher
- IET
- Language
- English
- Type
- Journal Article
- 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 nearfield 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.