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This paper presents a 4×4 single-layer dual-band array antenna operating in K and Ka-band using Gap Waveguide technology (GW). Radiating elements consist of I-shaped slots located on the top plate of the antenna and backed by a novel coaxial cavity with dual-frequency operation. The antenna presents two ports, one for each band, and radiates a directive far field pattern with linear polarization. A single-layer wideband corporate-feed network is used to excite the cavities. In addition, adoi:10.1109/lawp.2021.3054408 fatcat:dcv7wkea4vcbnchyw4untznxfa