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

Figure 13

Normalized radiation patterns at 1.9 GHz of the 8-element antenna array fed by the 8 × 8 BM. The curves T1-T8 depict the theoretical results that correspond to beams 1-8, respectively, of Table 2. Accordingly, M1-M8 stand for the measurements.