A compact relativistic magnetron with axial microwave radiation is experimentally investigated. Under the modified magnetic field distribution, only connecting a special horn antenna in the axial direction, the relativistic magnetron can stably radiate high power and high efficiency microwaves. The total length of the device is ∼0.3 m, and the volume is ∼0.014m3. In such working condition that the applied voltage is 539 kV and the magnetic field is ∼0.38 T, the output microwave power is ∼1.24 GW. Correspondingly, the total efficiency is about 34.1%. The radiating frequency is 2.35GHz, which is in agreement with the π mode frequency of the theoretical expectation.
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Li et al. (2012) studied this question.
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