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Volume 9
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10.3390/electronics9122060
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Article

Investigation on Symmetric and Asymmetric Broadband Low-Loss W-Band Pillbox Windows

by
Tongbin Yang
1,
Xiaotong Guan
2,3,
Wenjie Fu
1,3,*,
Dun Lu
1,
Chaoyang Zhang
1,
Jie Xie
1,
Xuesong Yuan
1,3 and
Yang Yan
1,3
1
School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu 610054, China
2
School of Physics, University of Electronic Science and Technology of China, Chengdu 610054, China
3
Terahertz Science and Technology Key Laboratory of Sichuan Province, University of Electronic Science and Technology of China, Chengdu 610054, China
*
Author to whom correspondence should be addressed.
Electronics 2020, 9(12), 2060; https://doi.org/10.3390/electronics9122060
Submission received: 5 November 2020 / Revised: 26 November 2020 / Accepted: 1 December 2020 / Published: 3 December 2020
(This article belongs to the Special Issue Design, Technologies and Applications of High Power Vacuum Electronic Devices from Microwave to THz Band)
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Abstract

In order to develop wide-band low-loss windows for W-band vacuum electronic devices and easily fabricate them, symmetric and asymmetric pillbox windows are investigated and reported in this paper. A symmetric pillbox window and an asymmetric pillow-box window were designed, simulation optimized, fabricated, and tested. The initial parameters for the two pillbox windows were designed by equivalent circuit theory. Computer simulation technology (CST) three-dimensional (3D) electromagnetic simulation software was used to verify and optimize the design. Because of the uncontrollability of welding during the experiment, this article provides two solutions. One is to measure and reprocess the symmetrical pillbox window with the dielectric sheet welded to reduce the influence of welding on the measurement results; the other is an asymmetrical box window which is designed to avoid the error caused by the welding of the box window. The best experimental results for the symmetric pillbox window were |S21| close to 1 dB and reflection parameter |S11| close to 10 dB in the frequency range of 77–110 GHz. The experimental results for the asymmetric pillbox window were |S21| < 1 dB nearly in the frequency range of 76–109.5 GHz. The experimental results show that both solutions efficiently complete the design of broadband pillbox windows and would potentially be operated in the gigahertz millimeter-wave region.
Keywords: pillbox window; wide-band; W-band; low loss pillbox window; wide-band; W-band; low loss

Share and Cite

MDPI and ACS Style

Yang, T.; Guan, X.; Fu, W.; Lu, D.; Zhang, C.; Xie, J.; Yuan, X.; Yan, Y. Investigation on Symmetric and Asymmetric Broadband Low-Loss W-Band Pillbox Windows. Electronics 2020, 9, 2060. https://doi.org/10.3390/electronics9122060

AMA Style

Yang T, Guan X, Fu W, Lu D, Zhang C, Xie J, Yuan X, Yan Y. Investigation on Symmetric and Asymmetric Broadband Low-Loss W-Band Pillbox Windows. Electronics. 2020; 9(12):2060. https://doi.org/10.3390/electronics9122060

Chicago/Turabian Style

Yang, Tongbin, Xiaotong Guan, Wenjie Fu, Dun Lu, Chaoyang Zhang, Jie Xie, Xuesong Yuan, and Yang Yan. 2020. "Investigation on Symmetric and Asymmetric Broadband Low-Loss W-Band Pillbox Windows" Electronics 9, no. 12: 2060. https://doi.org/10.3390/electronics9122060

APA Style

Yang, T., Guan, X., Fu, W., Lu, D., Zhang, C., Xie, J., Yuan, X., & Yan, Y. (2020). Investigation on Symmetric and Asymmetric Broadband Low-Loss W-Band Pillbox Windows. Electronics, 9(12), 2060. https://doi.org/10.3390/electronics9122060

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