Design and Analysis of Wideband Nonuniform Branch Line Coupler and Its Application in a Wideband Butler Matrix

<table class="table-group" width="800px"><tr class="fig-image" id="a"><td><img alt="853651.fig.0012a" src="https://static-preview.hindawi.com/articles/ijap/volume-2012/853651/figures/853651.fig.0012a.jpg"/></td></tr><tr class="fig-caption"><td align="center"><table><tr><td><b>(a) </b>Input port 1 or 4 are excited</td></tr></table></td></tr><tr class="fig-image" id="b"><td><img alt="853651.fig.0012b" src="https://static-preview.hindawi.com/articles/ijap/volume-2012/853651/figures/853651.fig.0012b.jpg"/></td></tr><tr class="fig-caption"><td align="center"><table><tr><td><b>(b) </b>Input port 2 or 3 are excited</td></tr></table></td></tr></table>

<table>Return loss of the proposed Butler Matrix when different ports are fed.</table>

International Journal of Antennas and Propagation

fig12

Figure 12

Figure 12: Design and Analysis of Wideband Nonuniform Branch Line Coupler and Its Application in a Wideband Butler Matrix 