64-Element Linear Slot Array SIW Cavity-backed Antenna Using Higher Order Excitation

A novel higher order mode excitation method for a 8×8 cavity-backed slot array antenna in Ku-Band is introduced in this letter. The antenna is formed by three main layers, consisting power divider, slotted cavities, and dipoles. All the 64 elements of the array is simply excited by a coaxial probe located at the center of the ground plane. The power divider distributes the electromagnetic waves into the upper four cavities, which leads to the excitation of TE440 mode in each cavity. The fabricated antenna exhibits a maximum gain of 19.6dBi and radiation efficiency of 80%. The measured S11< -10 dB is in the range of 14.1-14.3 GH.Moreover, the aperture efficiency of this antenna reached a peak of 72%.