Over-Size Pill-Box Window for Sub-Terahertz Vacuum Electronic Devices

Electronics

Jie Xie¹  Tongbin Yang¹  Yang Yan¹  Wenjie Fu¹  Xuesong Yuan¹  Dun Lu¹  Chaoyang Zhang¹  Xiaotong Guan² 

[1] School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu 610054, China;School of Physics, University of Electronic Science and Technology of China, Chengdu 610054, China;

关键词: pillbox window;    220 GHz;    low loss;    sub-terahertz;   

DOI  :  10.3390/electronics10060653

来源: DOAJ

【 摘 要 】

The pill-box window is one of the important components of microwave vacuum electronic devices (VEDs), and research into it is of great significance. As the operating frequency increases, the problems associated with the reduction in the structure size include the reduction of the brazing plane and the reduction in the tolerance of the pill-box window. These problems will cause traditional pill-box windows to be unsuitable in high-frequency bands, especially in terahertz and sub-terahertz regions. The most influential factor is the length of the circular waveguide in the box window. The welding plane of the over-size pill-box window is the annular bottom surface on both sides of the dielectric sheet, which is larger than the circular waveguide, and the operating frequency does not directly affect the area of the brazing surface. Choosing a suitable diameter for the dielectric sheet can effectively increase the tolerance to the length of the pill-box window circular waveguide. Therefore, an over-size pill-box window would be a practicable approach to improve the performance compared to the traditional pillow-box in high-frequency bands. This paper describes, in detail, the theoretical design, simulation optimization and experimental process of this improved pill-box window. An over-size pill-box window suitable for G band VEDs was successfully developed. The experimental result in the 215–225 GHz band is that the maximum transmission loss is −1 dB, and the overall transmission loss is close to −0.5 dB. The overall reflection is less than −11 dB.

【 授权许可】

Unknown