International Journal of Antennas and Propagation

Research Article

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

Figure 3

Decomposition of the nonuniform branch line coupler into even and odd modes of excitation.
853651.fig.003a
(a) Even mode (e)
853651.fig.003b
(b) Odd mode (o)