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In this paper, a novel dual-frequency magnetically insulated transmission line oscillator (MILO) is presented and investigated to generate two separate, stable, and pure high-power microwaves (HPMs) in high-frequency bands. The proposed device is derived from the L-band complex MILO put forward by Fan According to the operation principle, the dual-frequency MILO is divided into two MILOs (MILO-1 and MILO-2). The MILO-2 (X-band MILO) is studied first, where a new load is introduced to keep it from disruption by anode plasma in the load region. Then, the dual-frequency MILO model is overall analyzed and optimized. Results of particle-in-cell simulation show that when the dual-frequency MILO is driven by an electron beam with 610 kV and 82 kA, two HPMs are generated with a total power of 5.9 GW, and power conversion efficiency is about 11.8%. HPM of MILO-1 falls in C-band of 7.6 GHz with a power of 3.2 GW, and that of MILO-2 lies in X-band of 9.26 GHz with a power of 2.7 GW. Power difference between the two HPMs is about 0.7 dB. Time-frequency analysis shows that no frequency interference between MILO-1 and MILO-2 occurs. The results in this paper verify the feasibility of a high-efficiency dual-high-frequency MILO. Correlative experiments are being prepared in our laboratory.
Date of Publication: Oct. 2009