Bifocal Dual-Reflectarray Antenna to Generate a Complete Multiple Spot Beam Coverage for Satellite Communications in Ka-Band

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Open AccessArticle

byEduardo Martinez-de-Rioja1,*,Jose A. Encinar2andGiovanni Toso3


Area of Signal Theory and Communications, Universidad Rey Juan Carlos, 28943 Fuenlabrada, Spain


Information Processing and Telecommunications Center, Universidad Politécnica de Madrid, 28040 Madrid, Spain


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;

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)


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

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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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