128-Element Multibeam Antenna Array with Integrated Feeding Networks

In this paper, an 8 × 16-element multibeam antenna array with integrated feeding networks is proposed. The whole antenna array comprises two groups of 8×8 dual-polarized bow-tie dipole antenna elements and 2×16 integrated Butler matrix feeding networks. By modifying the Butler matrix structures, four beam clusters are generated for 45° area coverage in the elevated plane in the measurement. The pr...