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.0011a" src="https://static.hindawi.com/articles/ijap/volume-2012/853651/figures/853651.fig.0011a.jpg"/></td></tr><tr class="fig-caption"><td align="center"><table><tr><td><b>(a) </b>Input port 1 excitation</td></tr></table></td></tr><tr class="fig-image" id="b"><td><img alt="853651.fig.0011b" src="https://static.hindawi.com/articles/ijap/volume-2012/853651/figures/853651.fig.0011b.jpg"/></td></tr><tr class="fig-caption"><td align="center"><table><tr><td><b>(b) </b>Input port 2 excitations</td></tr></table></td></tr><tr class="fig-image" id="c"><td><img alt="853651.fig.0011c" src="https://static.hindawi.com/articles/ijap/volume-2012/853651/figures/853651.fig.0011c.jpg"/></td></tr><tr class="fig-caption"><td align="center"><table><tr><td><b>(c) </b>Input port 3 excitations</td></tr></table></td></tr><tr class="fig-image" id="d"><td><img alt="853651.fig.0011d" src="https://static.hindawi.com/articles/ijap/volume-2012/853651/figures/853651.fig.0011d.jpg"/></td></tr><tr class="fig-caption"><td align="center"><table><tr><td><b>(d) </b>Input port 4 excitations</td></tr></table></td></tr></table>

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

International Journal of Antennas and Propagation

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Figure 11

Figure 11: Design and Analysis of Wideband Nonuniform Branch Line Coupler and Its Application in a Wideband Butler Matrix 