Design and Implementation of Single-Layer 4 × 4 and 8 × 8 Butler Matrices for Multibeam Antenna Arrays

Figure 12

Normalized radiation patterns at 2.44 GHz of the 4-element antenna array fed by the BM shown in Figure 2(b). The curves T1-T4 depict the theoretical results that correspond to beams 1-4, respectively, of Table 1. Accordingly, M1-M4 stand for the measurements.