A New Approach for High-Power Coaxial Magnetron Using Stacked Anode Resonators

A novel design of the X-band megawatt-class coaxial magnetron using multiple-anode resonators placed in a stacked configuration is presented. The proposed design enhances the output power of a coaxial magnetron substantially without requiring external circuitry for power combining. The coaxial magnetron design is presented with two different cathode arrangements: one with separate cathodes and the other with connected cathodes. This article presents a new way for the generation of high-power microwaves by combining powers generated by multiple-anode resonators within a coaxial magnetron itself. The proposed coaxial magnetron is analyzed using the particle-in-cell (PIC) simulations. The output power of double-anode resonator magnetron is found to increase about 2.73 times compared with the coaxial magnetron with a single-anode resonator. The peak output power of 5.78 MW with 49.4% efficiency is obtained at 9.2906 GHz when a separate cathode arrangement is used, and both cathodes are excited simultaneously. The circuit efficiency and electronic efficiency are obtained as 83% and 59.5%, respectively. A wide frequency tuning range of 30.5 MHz is obtained, from 9.2840 to 9.3145 GHz. When only one cathode is excited, a different power level can be obtained. The output power can be enhanced further if more than two anode resonators are used in the connected cathode arrangement. The peak output power of 7.8 MW with 52% total efficiency is obtained with three anode resonators. The output performances of both the designs having different cathode arrangements are compared.