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Matos, S. A., Naseri, P., Felício, J., Costa, J. R., Fernandes, C. A. & Fonseca, N. J. G. (2025). K/Ka dual-band dual-polarization feed system for compact transmit-array SOTM antennas. In Proceedings of the IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications, APWC. (pp. 189-193). Palermo, Italy: IEEE.

S. D. Matos et al.,  "K/Ka dual-band dual-polarization feed system for compact transmit-array SOTM antennas", in Proc. of the IEEE-APS Topical Conf. on Antennas and Propagation in Wireless Communications, APWC, Palermo, Italy, IEEE, 2025, pp. 189-193

@inproceedings{matos2025_1786549555230,
	author = "Matos, S. A. and Naseri, P. and Felício, J. and Costa, J. R. and Fernandes, C. A. and Fonseca, N. J. G.",
	title = "K/Ka dual-band dual-polarization feed system for compact transmit-array SOTM antennas",
	booktitle = "Proceedings of the IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications, APWC",
	year = "2025",
	editor = "",
	volume = "",
	number = "",
	series = "",
	doi = "10.1109/APWC65665.2025.11190477",
	pages = "189-193",
	publisher = "IEEE",
	address = "Palermo, Italy",
	organization = "",
	url = "https://ieeexplore.ieee.org/document/11190477"
}

TY  - CPAPER
TI  - K/Ka dual-band dual-polarization feed system for compact transmit-array SOTM antennas
T2  - Proceedings of the IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications, APWC
AU  - Matos, S. A.
AU  - Naseri, P.
AU  - Felício, J.
AU  - Costa, J. R.
AU  - Fernandes, C. A.
AU  - Fonseca, N. J. G.
PY  - 2025
SP  - 189-193
SN  - 2835-2378
DO  - 10.1109/APWC65665.2025.11190477
CY  - Palermo, Italy
UR  - https://ieeexplore.ieee.org/document/11190477
AB  - Beam scanning is a fundamental requisite for mobile ground terminals of satellite communication systems. Mechanical steering using transmit-arrays (TAs) has been studied as a cost-effective alternative to phased array antennas. The design of the primary feed for this type of aperture can be challenging in the context of satellite-on-the-move (SOTM) applications. Several antenna specifications must be implemented at feed level, including dual-band operation with switchable orthogonal circular polarization states for multi-spot satellite handover. A new modular design approach for the feed system of TA antennas is presented comprising: i) a low gain dual-port linearly polarized waveguide antenna for polarization switching; ii) a dual-band polarizer for orthogonal Rx/Tx circular polarizations conversion; iii) a dielectric lens for a proper illumination taper of the TA, which creates a virtual focus in both bands behind the feed structure. This approach allows the feed integration with the dual-band TA, without increasing the overall height of the terminal relative to the TA focal length. The concept is validated experimentally in a complete antenna system with dimensions of 196 × 147 mm2, which provides mechanical scanning up to 50° from boresight with 23 dBi and 25 dBi of gain at 20 GHz and 30 GHz, respectively. 
ER  -