J. O. Meilus, M. J. A. Smith


This paper presents the up to date situation on the field of powerful microwave frequency multipliers. It is shown that the most prospective for effective frequency multiplication are the cascade magnetron multipliers. They not only have high gain and efficiency but also sufficiently broad frequency band. The device consists of two cascades. The input cascade oscillation system is tuned to the frequency n and the output one to its n-th harmonic. The magnetron gun forms tube-shaped electron stream and injects it into the input cascade. The extensive wave-electron interaction in this cascade result in getting well bunched electron spokes with the high level of the higher harmonics of the convection current. The electron spokes are injected into the output cascade where they induce strong nn frequency electromagnetic field in the slow wave structure of the cascade. Experimental data submitted in this paper confirm this assertion: the output power of the multiplier, working on the 4-th harmonic in the range of 10 cm wavelength, is 430 W; it has gain 23 dB, electronic efficiency 52% and frequency band 15% with linear frequency characteristic. Only relativistic microwave devices working on the principle of the cyclotron resonance maser, such as gyrotron and peniotron, have the similar characteristics. But their structure and feeding are much more complicated.

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