Open AccessSimple generation of orbital angular momentum modes with azimuthally deformed Cassegrain subreflector
Author(s) -
Byun WooJin,
Lee YoungSeung,
Kim Bong Su,
Kim Kwang Seon,
Kang Min Soo,
Cho Yong Heui
Publication year - 2015
Publication title -
electronics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.375
H-Index - 146
eISSN - 1350-911X
pISSN - 0013-5194
DOI - 10.1049/el.2015.1833
Subject(s) - cassegrain antenna , cassegrain reflector , optics , angular momentum , feed horn , reflector (photography) , physics , antenna (radio) , parabolic antenna , radiation pattern , periscope antenna , azimuth , offset dish antenna , fan beam antenna , engineering , telecommunications , classical mechanics , telescope , light source
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.