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Matos, S., Fonseca, N. J. G., João C. Serra, João M. Felício, Costa, J. R. & Fernandes, C. A. (2023). Generalized Risley Prism for Beam-Steering Transmit Arrays With Reduced Grating Lobes. IEEE Transactions on Antennas and Propagation. 71 (11), 8420-8428

S. D. Matos et al.,  "Generalized Risley Prism for Beam-Steering Transmit Arrays With Reduced Grating Lobes", in IEEE Transactions on Antennas and Propagation, vol. 71, no. 11, pp. 8420-8428, 2023

@misc{matos2023_1734978626823,
	author = "Matos, S. and Fonseca, N. J. G. and João C. Serra and João M. Felício and Costa, J. R. and Fernandes, C. A.",
	title = "Generalized Risley Prism for Beam-Steering Transmit Arrays With Reduced Grating Lobes",
	year = "2023",
	doi = "10.1109/TAP.2023.3313230",
	howpublished = "Ambos (impresso e digital)",
	url = "https://doi.org/10.1109/TAP.2023.3313230"
}

TY  - GEN
TI  - Generalized Risley Prism for Beam-Steering Transmit Arrays With Reduced Grating Lobes
T2  - IEEE Transactions on Antennas and Propagation
VL  - 71
AU  - Matos, S.
AU  - Fonseca, N. J. G.
AU  - João C. Serra
AU  - João M. Felício
AU  - Costa, J. R.
AU  - Fernandes, C. A.
PY  - 2023
SP  - 8420-8428
SN  - 0018-926X
DO  - 10.1109/TAP.2023.3313230
UR  - https://doi.org/10.1109/TAP.2023.3313230
AB  - Wide angle beam steering is a fundamental requisite for the new generation of millimeter waves communication systems. Mechanical scanning using two transmit-arrays (TAs) with independent axial rotation movements - known as the Risley prism approach - is being considered as a potential enabling technology for many cost-driven applications. There is an ongoing research effort to improve this solution, however, grating lobes are still a main limitation for the operation of these antennas. Herein, we show that this vestigial effect can be overcome by a co-design of the phase correction of the two rotating surfaces, instead of considering each TA as a separate “prism” (the conventional approach). The proposed generalized phase correction is compared with the conventional counterpart using a design example based on fully dielectric TAs. Experimental results confirm that the predicted grating lobes of the conventional design can be mitigated, corresponding to a significant reduction of the side lobe level (SLL) in the complete scanning plane. For the given full-dielectric Ka-band design example, is possible to scan up to 55 degrees with SLL<-8.3 dB and scan loss of -3.6 dB, whereas, with the conventional approach, the same scan implies SLL< -4.4 dB and a scan loss of -6.1 dB.
ER  -