Broadband energy transmission window for terahertz vacuum electronic device

Abstract

The invention discloses a broadband energy transmission window for a terahertz vacuum electronic device. The broadband energy transmission window comprises rectangular waveguides, transition sections, circular waveguides and a dielectric window sheet which are sequentially arranged from the two ends to the inside with the same central axis, wherein the dielectric window sheet is hermetically welded with the circular waveguides on the two sides, the broadband energy transmission window is symmetrical about the dielectric window sheet, the transition section is composed of a rectangular waveguide inner cavity and a metal groove formed in the outer side of the center line of the wide edge of the rectangular waveguide, the metal grooves are symmetrical about the plane where the center line and the central axis of the wide side of the rectangular waveguide are located, the wide side length of the metal groove is smaller than the wide side length of a folded waveguide, and the vertical distance between the metal groove and the central shaft is smaller than the radius of the circular waveguide. According to the invention, the broadband energy transmission window has the small reflection characteristic, can meet the broadband requirement, is low in the sensitivity of waveguide structure parameters, low in the requirement for machining precision and assembly precision, high in the machining yield, and easy in large-scale production.

Description

technical field [0001] The invention relates to the field of vacuum electronic devices. More specifically, it relates to a broadband energy transfer window for terahertz vacuum electronic devices. Background technique [0002] Vacuum electronic devices have important application value in the fields of communication, imaging, and detection, but the main obstacle restricting their development is the low output power level. Microwave energy transmission window is an important part of vacuum electronic devices. In addition to ensuring that vacuum electronic devices work in vacuum conditions, the energy transmission window must also ensure small reflection and low input and output losses. In the terahertz frequency band, the loss of electromagnetic waves passing through the window is relatively large, and the structural size is very small, so there are more stringent requirements on the strength, thermal properties, and dielectric constant of the window frame and window materia...

AI Technical Summary

Problems solved by technology

[0005] At present, the standard box-shaped window reflection is less than -20dB and the bandwidth can reach 49.5GHz, which meets the needs of the 190-240GHz frequency band. However, due to the high sensitivity of the diameter and length of the circular waveguide, the processing error of ±0.01mm will cause great deterioration of the window performance. , low yield, not suitable for mass production

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