Tx-Rx lens-based satellite-on-the-move Ka-band antenna
Silva, J. S.
Fernandes, C. A.
; Mosig, JM
IEEE Antennas and Wireless Propagation Letters Vol. 14, Nº -, pp. 1408 - 1411 , March, 2015.
ISSN (print): 1536-1225
Journal Impact Factor: 1,312 (in 2008)
Digital Object Identifier: 10.1109/LAWP.2015.2409316
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A simple low-cost mobile ground terminal antenna for Ka-band satellite communications is presented. The antenna is composed of a shaped dielectric lens which tilts and rotates in front of a feed to direct the beam. The wideband feed system is composed of a quad-ridged horn with a 45° slant aperture and a coaxial-to-quad-ridged circular waveguide transition. The lens allows simple mechanical beam steering from 0° to 65° in relation to the zenith and 360° in azimuth by rotating both the lens and the feed slanted aperture. Performance measurements of a manufactured prototype prove the beam tilting capabilities in elevation with a maximum gain of 22 dBi and scan loss below 3 dB at 20 GHz and 24 dBi gain with less than 4.5 dB scan loss at 30 GHz.