60-GHz substrate integrated waveguide-fed transverse aperture antennas

Waveguide slot arrays have been intensively used in a variety of wireless systems because of their compact structures, large power capacity, high efficiency, and high reliability. The resonant and non-resonant longitudinal slot, inclined slot, and transverse slot have been long studied [1–3]. Up to now, waveguide longitudinal slot arrays have been extensively analyzed and the most frequently used for their compact structure and pure linear polarization [4–8]. However, the operation bandwidth of a waveguide slot antenna array is quite limited, which can be improved using a subarray feed, a dielectric-slab partially filled waveguide, and a wide slot [10–12].