A novel feed network for a sectoral conical beam forming array antenna

A novel feed network for a sectoral conical beam has been proposed. The proposed feed network can make four beams that have maximum radiation at 45° elevation by applying a 2×2 array antenna. The feed network consists of four 90° hybrids, a crossover, and four 90° delay lines. The 2×2 array antenna and the feed network were fabricated on a microstrip structure, and performances were measured at 2.57 GHz. The measured radiation patterns showed that the maximum radiations occurred at the 45° elevation angle and at the 45°, 135°, 225°, and 315° azimuth angles, depending on the choice of the input port of the feed network. The proposed antenna structure could be implemented to receive satellite signals by integrating it in vehicle roofs.