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Title: Wide-angle mechanical scanning Transmit-arrays for satellite Ka-band user terminals
Authors: Matos, S. A.
Costa, J. R.
Lima, E. B.
Naseri, P.
Fernandes, C. A.
Fonseca, N. J. G.
Keywords: Transmit-arrays
High-gain antennas
Wide-beam steering
Mechanical scanning
Dual band
Circular polarization
Satellite-on-the-move (SOTM)
Issue Date: 2018
Publisher: IEEE
Abstract: The antenna design for broadband satellite communications is particularly challenging, new cost-effective solutions are still needed. An overview of recent contributions from the authors on planar transmit-arrays (TAs) for satellite Kaband user terminals is presented. We tackle several design problems: how to improve the scanning coverage using low cost mechanical beam steering, how to choose the type of unit cells that compose the TA, how to devise a single aperture with high gain that operates simultaneous at two widely separate frequency bands. Different prototypes are used to conduct these studies. All these TAs provide wide beam zenith scanning, [-50º,50º] with less that 3dB of scan loss, good circular polarization performance and low beam distortions. The prototypes have the same aperture size, 195 × 145 mm2, that provide gains up to 29 dBi for 30 GHz.
Peer reviewed: yes
Appears in Collections:IT-CRI - Comunicações a conferências internacionais

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