Delgado Lozano, Ignacio MaríaFernández Prieto, ArmandoLosada Torres, VicenteBoix, R. R.Medina Mena, Francisco2025-03-192025-03-192024Delgado Lozano, I.M., Fernández Prieto, A., Losada Torres, V., Boix, R.R. y Medina Mena, F. (2024). Design of Broadband Aperture-Coupled Microstrip Antenna Arrays With Differential Feeding. IEEE Access, 12, 173066-173075. https://doi.org/10.1109/ACCESS.2024.3498698.2169-3536https://hdl.handle.net/11441/170617This paper proposes the design of broadband microstrip antennas fed by differential microstrip lines. The designed broadband antennas are composed of two capacitively coupled rectangular stacked patches excited through a dog-bone shaped aperture by short-circuited differential microstrip lines. The short-circuited lines are symmetrically located with respect to the apertures so that their differential-mode (DM) naturally excites the aperture, while their common-mode (CM) is intrinsically rejected. The DM design of the antennas is based on an equivalent second-order filter circuit consisting of two capacitively coupled parallel LC resonators, which helps to ensure the DM broadband impedance matching of the antenna. Two different 2 × 2 arrays using the proposed antennas have been designed, fabricated and measured, one involving four 180° hybrids and three power dividers in the feeding network, the other involving one 180° hybrid and six power dividers. Bandwidths larger than 25%, gains around 12 dBi and cross-polarization below -25 dB have been achieved by the two arrays at a center frequency of 5.5 GHz.application/pdf10 p.engAttribution 4.0 Internationalhttp://creativecommons.org/licenses/by/4.0/Common-mode rejectionDifferential-fed antennasFiltering theoryMicrostrip antenna arraysinfo:eu-repo/semantics/articleinfo:eu-repo/semantics/openAccesshttps://doi.org/10.1109/ACCESS.2024.3498698