Radial logarithmic helix waveguide slow wave line and processing method thereof

Abstract

The invention discloses a radial logarithmic helix waveguide slow wave line which comprises a dual-ridge waveguide. The dual-ridge waveguide rotates according to a plane logarithmic helix line in the wide-side direction, and the inner port of the dual-ridge waveguide is an electromagnetic wave input port, and the outer port of the dual-ridge waveguide is an electromagnetic wave output pot; a round-disc-type channel is formed in the center of the dual-ridge waveguide and serves as a channel for electron beam transmission and beam-wave interaction. Because the width of the dual-ridge waveguide is reduced only at the electron beam channel part, the radial electric field is more intensive at the channel opening part under the condition that the transmission mode of the electromagnetic waves is not unchanged, and the intensity of the electric field at the central part of the electron beam channel is 60% higher than that of the radial logarithmic helix waveguide slow wave line at the same position in the prior art, thus the intensity of beam-wave interaction is improved greatly; and meanwhile, because the dual-ridge waveguide has fundamental mode bandwidth which far wider than that of the conventional rectangular waveguide and also far wider than the working bandwidth of the radial logarithmic helix waveguide slow wave line in the prior art, and the port impedance match is easier.

Description

technical field [0001] The invention belongs to the technical field of microwave vacuum electronic devices, and more specifically relates to a radial logarithmic spiral waveguide slow wave line in a traveling wave tube and a processing method thereof. Background technique [0002] As the most widely used electric vacuum device in the microwave frequency band, the traveling wave tube has a prominent application status in many fields such as millimeter wave radar, guidance, communication, microwave remote sensing, and radiation measurement. Due to its irreplaceable broadband characteristics, it has also become the most important microwave tube in various fields of equipment. [0003] A typical traveling wave tube consists of five parts: electron gun, focusing system, slow wave line (slow wave structure), input and output devices and collector. As the core component of the traveling wave tube, the task of the slow wave line is to transmit the high-frequency electromagnetic tra...

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Problems solved by technology

However, there are still areas to be improved: ①. The field at the position of the electron beam channel is weak, which limits the efficiency of the beam-wave interaction. This limitation is particularly significant in the radial beam traveling wave tube; because the radial beam traveling wave tube The current is diverged outward from the cathode located in the center. As the radius increases, the current density will decrease rapidly, resulting in weakened clustering of electron beams, thereby affecting the beam-wave interaction. ②, Radial logarithmic spiral The bandwidth of the waveguide slow wave structure also needs to be further expanded

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