Compact H-Plane CLAF-SIW Horn Antenna With Phase Front Correction Biedma Pérez, Andrés Segura Gómez, Cleofás Palomares Caballero, Ángel Padilla De La Torre, Pablo Contactless air-filled substrate-integrated waveguide (CLAF-SIW) horn antenna millimeter waves phase front correction This work was supported in part by MCIN/AEI/10.13039/501100011033 under Grant PID2020-112545RB-C54, Grant PDC2023–145862-I00, Grant TED2021-129938B-I00, and Grant TED2021-131699B-I00; in part by European Union NextGenerationEU/PRTR; and in part by the ‘‘Ministerio de Universidades’’ under Grant FPU20/00256. Department of Signal Theory, Telematics and Communications, Centre for Information and Communication Technologies (CITIC) This work presents an H-plane contactless air-filled substrate-integrated waveguide (CLAF-SIW) horn antenna, whose directivity is enhanced by incorporating a metalens along the horn flaring. By tuning the distribution of the unit cells of the metalens, it is possible to reduce phase errors at the aperture, a common issue in horn antennas. The unit cell of the metalens is designed by using a metallic patch on a substrate-integrated hole. By varying the size of the metal patches, different refraction indices can be tuned, resulting in a wideband performance. An analysis of the distribution of these unit cells along the horn antenna is conducted to achieve the desired equivalent effective refraction index through the metalens. The directivity achieved is comparable to that of a horn antenna with optimal dimensions, but with a 41% reduction in length. The measured results demonstrate an impedance bandwidth below −10 dB from 32.8 to 50 GHz, with a realized gain above 9.3 dBi. 2026-02-17T12:52:29Z 2026-02-17T12:52:29Z 2025-07-03 journal article A. Biedma-Pérez, C. Segura-Gómez, Á. Palomares-Caballero and P. Padilla, "Compact H-Plane CLAF-SIW Horn Antenna With Phase Front Correction." IEEE Access, vol. 13, pp. 114901-114910, 2025, doi: 10.1109/ACCESS.2025.3585567 https://hdl.handle.net/10481/111117 10.1109/ACCESS.2025.3585567 eng http://creativecommons.org/licenses/by-nc-nd/4.0/ open access Attribution-NonCommercial-NoDerivatives 4.0 Internacional IEEE