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

Figure 14

Normalized radiation patterns at 1.9 GHz of the 8-element antenna array fed by the BM, according to the schemes shown in the last 3 rows of Table 4. The curves TE, TF, and TG depict the theoretical results that correspond to beams E, F, and G, respectively. Accordingly, ME, MF, and MG stand for the measurements.