Flexible Phase Difference of 4 × 4 Butler Matrix without Phase-Shifters and Crossovers

<div>(a) Coupler model with 30° output phase difference. (b) Simulation of the coupler with 30° output phase difference.</div>

International Journal of Antennas and Propagation

Figure 5: Flexible Phase Difference of 4 × 4 Butler Matrix without Phase-Shifters and Crossovers 