A trapezoidal subwavelength hole high frequency structure extended interaction klystron

By employing an isosceles trapezoidal subwavelength aperture structure in the extended interaction klystron, the beam-wave interaction is enhanced, the characteristic impedance and bandwidth are improved, the problem of insufficient power and gain of traditional klystrons is solved, and high-frequency stability and wide bandwidth performance are achieved.

CN116130318BActive Publication Date: 2026-04-07UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Patent Information

Application Number
CN202310111842.3
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-02-14
Publication Date
2026-04-07
Estimated Expiration
2043-02-14

AI Technical Summary

Technical Problem

Traditional extended interaction klystrons suffer from insufficient power and gain, narrow bandwidth, and are prone to parasitic oscillations at high frequencies.

Method used

The input cavity, intermediate cavity, and output cavity adopt an isosceles trapezoidal subwavelength aperture structure. The long base is designed in proportion to the wide side of the resonant cavity to increase the interaction area between the wave and the beam, improve the characteristic impedance, avoid parasitic oscillations, and connect the resonant cavity and the coupling cavity through the proportionally proportioned isosceles trapezoidal subwavelength aperture.

Benefits of technology

It achieves high power, high gain and wide bandwidth, with a large input reflection coefficient S11 value and a -5dB bandwidth exceeding 1GHz, significantly improving energy feed and bandwidth expansion capabilities, and avoiding parasitic oscillations.

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Abstract

This invention belongs to the field of microwave vacuum electronic devices, specifically providing a trapezoidal subwavelength aperture high-frequency structure for an extended interaction klystron, used to improve the power and gain of the extended interaction klystron and expand its bandwidth. This invention creatively proposes an isosceles trapezoidal subwavelength aperture with a base length proportional to the width of the resonant cavity, thereby designing the input cavity, intermediate cavity, and output cavity. This increases the beam-wave interaction area and characteristic impedance of the intermediate cavity, improving the interaction efficiency while maintaining a low quality factor and avoiding parasitic oscillations. It also increases the characteristic impedance of the input and output cavities, enhancing beam-wave interaction and reducing the input reflection coefficient S. 11 With a relatively large value and a -5dB bandwidth greater than 1GHz, the power feed and bandwidth extension capabilities are further enhanced. Compared with the traditional trapezoidal structure, the extended interaction klystron of this invention has significant advantages in terms of high power, high gain, and wide bandwidth.
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