A novel planar four-way power divider with large dividing ratio

In this paper, a novel planar four-way power divider with symmetrical simple structure based on microstrip line is presented, and it's design formulas are deduced. It can achieve arbitrary power dividing ratio, ideal matched ports, ideal isolation between four ports, and the largest power dividing ratio can be 33:1 when the port impedance is 50 Ω and the maximum ring-line impedance is 120 Ω. The relative phase difference of four output ports are 0, π/2,π,π/2 respectively. The structure has ideal matched ports and isolation between four ports. It is suitable for high-power application. Finally, an experimental prototype with power dividing ratio 5.76:5.76:1:1 is simulated and measured respectively. The measured results validate the proposed method.