Slotted Waveguide Array Antenna Performance Enhancement by Parasitic Elements Augmentation

A novel design of Slotted Waveguide Array Antenna (SWGAA), at 8.5 GHz with beamwidth of 11 degrees and > -21 dB sidelobe level, with each slot is augmented with a pair of inverted L-shaped parasitic dipoles is presented in this work. Each dipole is located beside the long edges of the slot. The slot cut from a rectangular waveguide acts as a magnetic dipole while the parasitic dipoles act as electric dipoles. Both dipole types act as radiating elements. If both are designed to radiate at the same frequency at the proper amplitude and phase, the radiation performance can be enhanced. Performance comparisons between conventional SWGAA design and the proposed design are presented in this work.