Multiple Beamforming Planar Antenna Array with Broadside and End-fire Radiation Patterns

In this article, a compact planar antenna array with multiple beams in the broadside and end-fire radiation patterns using the 4×4 Butler Matrix (BM) is proposed. Proposed antenna generates 4 beams in broadside direction and 12 beams in End-fire direction with scanning angle greater than 38 and 110 degree respectively within the 3.3 and 3.6 GHz band while exciting various ports of BM circuit. The beam forming network (BFN) is cascaded with a twelve-element printed dipole array and four microstrip patch antenna array to obtain multiple beams with a peak active gain of 6.9 dBi and directivity of 11 dBi.