Directly produce circular polarization te 11 relativistic return wave tube

Abstract

The invention belongs to the field of masers and relates to a relativistic backward wave oscillator of a direct circular polarization TE11 mode. The relativistic backward wave oscillator comprises an annular cathode, angular partition double-pre-modulation chambers, angular partition slow wave structures, an output waveguide and a magnetic field coil. The annular cathode is at the most front end of the structure and emits an annular relativistic electron beam under the effect of high voltage pulse. The angular partition double-pre-modulation chambers, the angular partition slow wave structures, and the output waveguide are orderly arranged behind the annular cathode. The magnetic field coil is at the periphery of the annular cathode, the angular partition double-pre-modulation chambers, and the angular partition slow wave structures. The angular partition double-pre-modulation chambers and the slow wave structures are employed by the invention, two linearly polarized TE11 modes with the same frequency, similar amplitude and orthogonal polarization can be generated in two groups of structure. Through the offset of d / 4 of two groups of the double-pre-modulation chambers and the slow wave structures in an axial position, thus a 90-degree phase difference is introduced between the linearly polarized TE11 modes with orthogonal polarization, and the circular polarization TE11 mode is obtained in an output waveguide.

Description

technical field [0001] The invention belongs to the field of microwave masers, in particular to a relativistic return wave tube. Background technique [0002] The relativistic backward wave oscillator (hereinafter referred to as RBWO) has the characteristics of high power, high efficiency, and suitable for repetition frequency operation, and is one of the most important high-power microwave sources. Currently commonly used RBWO such as figure 1 As shown, it includes an annular cathode 1 , a resonant reflector 6 , a slow wave structure 7 , an output waveguide 4 and a magnetic field coil 5 . The ring cathode 1 is located at the front of the device; the resonant reflector 6, the slow wave structure 7 and the output waveguide 4 are separated from the ring cathode 1 by a certain distance, and placed behind it in turn; the magnetic field coil 5 is located at the ring cathode 1, the resonant reflector 6 and the slow Periphery of the wave structure 7. The resonant reflector 6 is ...

AI Technical Summary

Problems solved by technology

The introduction of mode converters and circular polarizers increases the weight and length of the system, and the conversion efficiency of the two times is limited and cannot reach 100%, resulting in energy loss

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