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Matos, S., Fernandes, M, João M. Felício, Costa, J. R., Fernandes, C. A. & Fonseca, N. J. G. (2026). Co-design of Low-Profile Leaky-Wave-Fed Transmit-Array Antennas Using the Generalized Risley Prism Concept for Side-Lobe Reduction. IEEE Transactions on Antennas and Propagation. 1-11

S. D. Matos et al.,  "Co-design of Low-Profile Leaky-Wave-Fed Transmit-Array Antennas Using the Generalized Risley Prism Concept for Side-Lobe Reduction", in IEEE Transactions on Antennas and Propagation, pp. 1-11, 2026

@article{matos2026_1780790387134,
	author = "Matos, S. and Fernandes, M and João M. Felício and Costa, J. R. and Fernandes, C. A. and Fonseca, N. J. G.",
	title = "Co-design of Low-Profile Leaky-Wave-Fed Transmit-Array Antennas Using the Generalized Risley Prism Concept for Side-Lobe Reduction",
	journal = "IEEE Transactions on Antennas and Propagation",
	year = "2026",
	volume = "",
	number = "",
	doi = "10.1109/TAP.2026.3693361",
	pages = "1-11",
	url = "https://ieeexplore.ieee.org/document/11531014"
}

TY  - JOUR
TI  - Co-design of Low-Profile Leaky-Wave-Fed Transmit-Array Antennas Using the Generalized Risley Prism Concept for Side-Lobe Reduction
T2  - IEEE Transactions on Antennas and Propagation
AU  - Matos, S.
AU  - Fernandes, M
AU  - João M. Felício
AU  - Costa, J. R.
AU  - Fernandes, C. A.
AU  - Fonseca, N. J. G.
PY  - 2026
SP  - 1-11
SN  - 0018-926X
DO  - 10.1109/TAP.2026.3693361
UR  - https://ieeexplore.ieee.org/document/11531014
AB  - Emerging millimeter wave communications systems require compact, low-mass, low-cost, and energy-efficient antennas, capable of high-gain, wide-angle beam steering. Recent advances in mechanical beam-scanning techniques make them attractive for the above requirements, compared to the phased array antennas, but are still bulkier. A leaky-wave-fed transmit-array (TA) antenna with two-dimensional (2D) beam scanning based on the Risley prism concept (RP), with coaxial rotation of the planar feed and the TA, is a promising approach for reducing the antenna profile to about 1-2?, while maintaining a good beam scanning performance, comparable to other planar solutions. However, these structures suffer from the same side-lobe (SLL) level limitation known for the spatially fed RPs. Another problem is the efficiency/complexity of the feeding antenna, which may limit antenna height reduction. To mitigate these impairments, we propose a novel co-design approach for the feed and the TA structures, enabled by the recent generalized Risley prism formulation. It allows using a Radial Line Slot Antenna (RLSA) both as the leaky-wave feed and first prism efficiently, thus benefiting from its simplicity and beam-forming flexibility. As an example, the TA is implemented as a perforated 3D-printed dielectric slab, which favors a large bandwidth, with 206 mm diameter and 2?; total thickness (1 mm prism separation). It steers the beam up to 58° over 360° azimuth, with SLL below -15 dB, scan loss below -4.0 dB, and 29.3 dBi maximum gain at 29 GHz. The full-wave results were validated experimentally. The proposed formulation is generic, not tied to this example.
ER  -