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Open AccessArticle
by
Eduardo Martinez-de-Rioja1,*
,Jose A. Encinar2andGiovanni Toso3
1
Area of Signal Theory and Communications, Universidad Rey Juan Carlos, 28943 Fuenlabrada, Spain
2
Information Processing and Telecommunications Center, Universidad Politécnica de Madrid, 28040 Madrid, Spain
3
Antenna and Sub-Millimeter Wave Section, European Space Agency ESTEC, 2200 AG Noordwijk, The Netherlands
*
Author to whom correspondence should be addressed.
Electronics 2020, 9(6), 961; https://doi.org/10.3390/electronics9060961
Received: 13 May 2020 / Revised: 3 June 2020 / Accepted: 6 June 2020 / Published: 9 June 2020
(This article belongs to the Special Issue New Trends in Reflectarray and Transmitarray Antennas)
Abstract
This paper presents a novel multibeam transmitting dual-reflectarray antenna able to generate a complete multiple spot coverage from a geostationary satellite in Ka-band (20 GHz). The bifocal design technique has been exploited for the first time to reduce by 50% the beam deviation factor with respect to the equivalent monofocal antenna, allowing to produce adjacent beams separated by only 0.56° in the antenna offset plane. In order to guarantee an acceptable spillover, the main reflectarray has been oversized in the same plane where the beams are compressed, resulting in an elliptical reflectarray of 3.5 m × 1.8 m. The interleaved beams required to provide the complete multi-spot coverage are produced in the orthogonal polarization, using the same aperture and feeds. The proposed antenna requires a smaller main aperture (about half of the area) and a lower number of feeds than other configurations that use a single oversized reflector to generate a complete multi-spot coverage, showing promising results for communication satellite applications in the Ka-band. View Full-Text
Keywords: bifocal antennas; dual-reflectarray antennas; Ka-band; multibeam antennas; multispot coverage; satellite communications bifocal antennas; dual-reflectarray antennas; Ka-band; multibeam antennas; multispot coverage; satellite communications
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited
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MDPI and ACS Style
Martinez-de-Rioja, E.; Encinar, J.A.; Toso, G. Bifocal Dual-Reflectarray Antenna to Generate a Complete Multiple Spot Beam Coverage for Satellite Communications in Ka-Band. Electronics 2020, 9, 961.
AMA Style
Martinez-de-Rioja E, Encinar JA, Toso G. Bifocal Dual-Reflectarray Antenna to Generate a Complete Multiple Spot Beam Coverage for Satellite Communications in Ka-Band. Electronics. 2020; 9(6):961.
Chicago/Turabian Style
Martinez-de-Rioja, Eduardo; Encinar, Jose A.; Toso, Giovanni. 2020. “Bifocal Dual-Reflectarray Antenna to Generate a Complete Multiple Spot Beam Coverage for Satellite Communications in Ka-Band.” Electronics 9, no. 6: 961.
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