Design and Realization of High Power Diplexer for Phase Reference Line in European Spallation Source

In this paper an example of the high power diplexer for the phase reference line in proton accelerator is presented. The diplexer operates at frequency 352 MHz and 704 MHz. The output power level is 200 W. Additionally the requirements for the slope of the diplexer phase characteristic have been set at low level. The diplexer consists of two filters realized in the microstrip line technology. To improve the diplexer characteristics a special method has been used in the design. The inverters in the lower frequency passband filter have different electric lengths. The measurements show the low loss, high isolation of transmission bands and phase stable in the passbands thus confirm applied method.