Navarro Cía, MiguelBeaskoetxea Gartzia, UnaiTeniente Vallinas, JorgeBeruete Díaz, Miguel2024-05-082024-05-082024Navarro-Cia, M., Beaskoetxea, U., Teniente, J., Beruete, M. (2024) Low-sidelobe-level millimeter-wave asymmetric bull's eye antenna with minimal profile feeding. IEEE Antennas and Wireless Propagation Letters, 23(1), 209-213. https://doi.org/10.1109/LAWP.2023.3321411.1536-122510.1109/LAWP.2023.3321411https://academica-e.unavarra.es/handle/2454/48061Bull’s eye antennas exhibit remarkable directivity considering their low profile, albeit accompanied by high sidelobes. This undesirable radiation characteristic is tackled here by reporting a complementary split ring feeding whereby the broadside space-wave partially responsible for the high sidelobes is cancelled while the leaky wave is excited effectively. This feeding results in an asymmetric bull’s eye antenna with minimal profile (∼ 0.73λ0) and no protrusions on the radiating interface. The fabricated 10-period antenna operating in the Ka-band shows a directivity of 23.5 dBi, a sidelobe level of −22.9 dB (>6 dB improvement compared to other bull’s eye antennas) and a beamwidth of 3.7◦ and 6.7◦ in the E- and H-plane, respectively.application/pdfeng© 2023 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other workBull's eye antennaKa-bandLeaky-wave antennaMillimeter wavesinfo:eu-repo/semantics/article2024-05-08info:eu-repo/semantics/openAccess