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Matos, S. A., Fonseca, N. J. G., Serra, J. C., Felício, J. M., 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

@article{matos2023_1716150913455,
	author = "Matos, S. A. and Fonseca, N. J. G. and Serra, J. C. and Felício, J. M. and Costa, J. R. and Fernandes, C. A.",
	title = "Generalized Risley prism for beam-steering transmit-arrays with reduced grating lobes",
	journal = "IEEE Transactions on Antennas and Propagation",
	year = "2023",
	volume = "71",
	number = "11",
	doi = "10.1109/TAP.2023.3313230",
	pages = "8420-8428",
	url = "https://ieeexplore.ieee.org/document/10251119"
}

TY  - JOUR
TI  - Generalized Risley prism for beam-steering transmit-arrays with reduced grating lobes
T2  - IEEE Transactions on Antennas and Propagation
VL  - 71
IS  - 11
AU  - Matos, S. A.
AU  - Fonseca, N. J. G.
AU  - Serra, J. C.
AU  - Felício, J. M.
AU  - Costa, J. R.
AU  - Fernandes, C. A.
PY  - 2023
SP  - 8420-8428
SN  - 0018-926X
DO  - 10.1109/TAP.2023.3313230
UR  - https://ieeexplore.ieee.org/document/10251119
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  -