Title :
Simple generation of orbital angular momentum modes with azimuthally deformed Cassegrain subreflector
Author :
Woo-Jin Byun ; Young-Seung Lee ; Bong Su Kim ; Kwang Seon Kim ; Min Soo Kang ; Yong Heui Cho
Author_Institution :
Microwave Technol. Res. Sect., Electron. & Telecommun. Res. Inst. (ETRI), Daejeon, South Korea
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.
Keywords :
microwave antennas; near-field communication; quadrature amplitude modulation; reflector antennas; Cassegrain subreflector; Near-field transformed radiation phase; OAM modes; azimuthally deformed Cassegrain subreflector; broadband low-profile antenna; cassegrain dual reflector antenna; far-field transformed radiation phase; feed reflection coefficients; frequency 15.1 GHz to 21.2 GHz; gain 10 dB; generate arbitrary orbital angular momentum; near-field range; orbital angular momentum; parabolic reflector antenna; simple generation; size 15.6 mm;
Journal_Title :
Electronics Letters
DOI :
10.1049/el.2015.1833
