A Novel4×4 Butler Matrix Connected to 8×1 Patch Array Antenna for Electronic Scanning Radar Application

The aim of this paper is to present a low cost steerable 8×1 antenna array system operating at 3GHz. Hence, a novel 4×4 butler matrix is proposed as a beam forming network responsible of redirecting the beams in different positions. The overall system uses microstrip line structure and is mounted on FR-4 substrate. The design is studied in details to obtain at the end four steerable beams.