Spatial Power Combining Experiment of High Power Microwave

Keywords: High power microwave, spatial power combining, microwave source, phased array antenna, klystron. Abstract. Spatial power combining scheme of employing multiple coherent high power microwave sources together with phased array antennas is presented to improve effective radiation power of High Power Microwave Source (HPMS). HPMS and spatial power combining validation system are developed, and spatial power combining experiment with 2 sets of HPMSs is conducted. HPMS, based on common high power klystrons and making use of inductive-adder ultra-high-voltage all-solid-state modulators, transmits and distributes its power uniformly to each radiation element of phased array antenna via radial line waveguides, and the spatial direction of transmitting beam is controlled by setting phase value of each radiation element. Experimental result shows that power combining efficiency is better than 90%.