An idea for low-profile unidirectional slot antennas based on its complementary dipoles

In this paper, a novel scheme of constructing low-profile unidirectional slot antennas has been proposed. The scheme is based on the complementary dipole concept. The basic principle of the complementary concept has been revisited, with a discussion on the effect of excitation amplitude on the unidirectional radiation performance. The practical antenna configuration has then been given, followed by some preliminary simulated results. Compared to some conventional techniques for designing unidirectional slot antennas, the proposed structure has several advantages such as low profile, low Q, and ease of fabrication.