Power divider based on vertical elliptical directional couplers with increased isolation and bandwidth

In this study, a novel high-isolation wideband divider based on multi-layer elliptical defected ground structure coupler is presented along with its analytical theory and design procedure. The proposed divider could be conveniently applied for high- power applications with less loss for the absence of isolation resistors. The simulation results show that in 3.1–10.6 GHz, the return loss S(11) and S(22) are −4 dB within 4–9 GHz, and the amplitude and phase difference between port 2 and port 3 is