In this paper the design and experimental verification of a switched beam antenna with low SLL, formed by an aperture-coupled linear array antenna 1 × 6 elements and fed by a 4 × 6 reduced Butler matrix for the SIM (Industrial, Scientific and Medical) band in 2.45 GHz is presented. The antenna was designed and manufactured domestically with a compact multilayer microstrip technology, total thickness of 62 mil, and the ability to switch 4 beams.