Research Article

Miniaturization Design for 8 × 8 Butler Matrix Based on Back-to-Back Bilayer Microstrip

Figure 11

The measured results of insertion loss (a) and phase difference (b) at Port 3. The phase difference at Port 3 is −112.5° theoretically.
583903.fig.0011a
(a)
583903.fig.0011b
(b)