Waveguide structure for reducing starting current and improving radiation efficiency

Abstract

The invention discloses a waveguide structure for reducing starting current and improving radiation efficiency, belonging to the field of vacuum electronics. The waveguide structure for reducing the starting current and improving the radiation efficiency comprises a flat rectangular grating and a sub-wavelength aperture array structure arranged above the grating; the grooves of the rectangular grating correspond to the through-holes of the sub-wavelength aperture array structure one-to-one; and two electron beam channels are located at the gap between the aperture array and the grating and above the aperture array separately. The two electron beams can simultaneously excite and interact with the plasmon waves of the upper and lower surfaces of the sub-wavelength aperture array structure; because the electron beam in the lower half of the space is in the closed structure, and the coupling impedance is relatively large, so the starting current is relatively low, and the oscillation can be started first; meanwhile, the oscillation of the electron beam in the upper half of the space is affected through the projection characteristics of sub-wavelength aperture array structure, so that the purpose of the oscillation starting of the whole device can be achieved. Compared with the common grating structure, the minimum starting current density that the electron beams require to generatesuper radiation phenomenon through the waveguide structure is effectively reduced.

Description

technical field [0001] The invention specifically relates to a special waveguide structure for reducing the oscillation current and improving the radiation efficiency, and belongs to the field of vacuum electronics. Background technique [0002] Miniaturized electric vacuum devices are important devices in electronic equipment, with the characteristics of small structure, light weight and high power. With the increasing complexity of modern electronic equipment, the reliability requirements for miniaturized electric vacuum devices are getting higher and higher. The rapid development of these devices has made them widely used in radar, guided strategic communication, electronic countermeasures, early warning aircraft and remote sensing, which is of great significance to the consolidation of national defense and the development of the national economy. [0003] The development of miniaturized electric vacuum devices mainly faces the following difficulties: First, with the inc...

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Problems solved by technology

[0003] The development of miniaturized electric vacuum devices mainly faces the following difficulties: First, with the increase of operating frequency, the processing size of components such as high-frequency structures of devices continues to decrease, and the processing precision and smoothness limit the improvement of operating frequency; It is because the starting current density of the electron beam is proportional to the square of the frequency, and considering factors such as smoothness and assembly process, the starting current has become a key issue that limits the development of miniaturized electric vacuum devices.

[0004] Flat plate grating has a simple structure, but requires a longer slow-wave interaction interval and longer axial length, resulting in high impedance and low radiation intensity. At the same time, the starting current density of the structure increases sharply with the increase of frequency

Although the structure of cylindrical grating and three-dimensional stacked hole array can reduce the starting current density, the structure is complex and the processing technology is difficult. In particular, the work of cylindrical grating structure requires an electron gun capable of emitting circular electron beams, which cannot be manufactured at the current technological level.

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