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This work was supported in part by MCIN/AEI/10.13039/501100011033 under grants PID2020-114172RB-C21, PID2023-146246OB-C32, and TED2021-130650B-C22, co-funded by the EU (European Union) "NextGenerationEU"/PRTR; by Ministerio de Educacion y Formacion Profesional, under grant FPU20/07267; and by FCT/MECI through national funds and, when applicable, co-funded EU funds under UID/50008: Instituto de Telecomunicacoes.

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Compact Beam-Scanning Reflectarray Antenna with SLL Reduction Using In-Plane Panel Translations

Publicat a:Applied Sciences-Basel. 15 (8): 4244- - 2025-04-11 15(8), DOI: 10.3390/app15084244

Autors: Gomez-Alvarez, Andres; Matos, Sergio A; Arrebola, Manuel; Pino, Marcos R; Fernandes, Carlos A

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A mechanical beam-scanning reflectarray (RA) antenna is presented for Ka band. The 1D steering of the beam is achieved through linear in-plane panel translations, which can be implemented at low cost using a rail-mounted moving RA panel. Compared to related works, a highly uniform beam level is achieved with a remarkably compact antenna profile. A new technique is also proposed to mitigate the high side lobes caused by the compact antenna optics, achieving an estimated 2.3 dB reduction in maximum SLL. The manufactured prototype has a panel size of 256.4 by 187.2 mm with 2898 elements, and an F/D of only 0.47. A measured scan loss of 1.1 dB is achieved over a 45-degree scanning range. The measured gain is 31.6 dBi and the aperture efficiency is 24.7% at the design frequency of 29.5 GHz, with SLL between -9.4 and -17.5 dB. In-band measurements show a 1 dB bandwidth from 28 to over 32 GHz (11.9%).

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