International Journal of Terahertz Science and Technology
Vol.14, No.3, September 2021. PP.52-70(2)
date2021-09-30 23:53:21 Click No.291

TST, Vol. 14, No. 3, PP. 52-60

(Invited paper) Overview of the application of periodic structure for the W-band circuit and system

Yongrong Shi *
Nanjing University of Aeronautics and Astronautics, Key Laboratory of Dynamic Cognitive System of Electromagnetic Spectrum Space, Ministry of Industry and Information Technology, 211106 Nanjing, China
* Email:
yongrongshi@nuaa.edu.cn

(Received September 2021)

Abstract: In this paper, the application of periodic structure for the W-band circuit and system is overviewed, and its future development is also discussed. Among the characteristics of the periodic structure, the stopband characteristic, which is also called electromagnetic bandgap (EBG), is focused in this overview paper. Two typical applications including EBG waveguide (gap waveguide) and EBG packaging are overviewed and summarized for the W-band circuit and system. For the gap waveguide, the stopband characteristic of the periodic structure prevent the electromagnetic wave leakage into the sides and the electromagnetic wave is guided within the designed paths. To integrate with the other passive and active components, three different W-band transitions have been proposed by the author for different kinds of the gap waveguides. Besides, a W-band gap waveguide bandpass filter has also been proposed by the author to study the passive component application of such technology. For the EBG packaging, two cases have been researched. The EBG packaging technique has been applied for improving the performances of a W-band coupler, and it has also been used for a low-profile and light W-band front-end integration. Finally, some discussions are given for this area.

Keywords: Periodic structure, Electromagnetic bandgap, W-band, Circuit and system, Gap waveguide

doi:

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TST, Vol. 14, No. 3, PP. 61-70

(Invited paper) Experimental research on interaction of gyrotron traveling wave tube with inner mode converter in w-band TE02 mode

Efeng Wang *, Xu Zeng, An Li and Shang Gao
National Key Laboratory of Science and Technology on Vacuum Electronics,
Beijing Vacuum Electronics Research Institute,
Post Box 749-41, 100015, Beijing, China
* Email: zhuwang9428@sina.com

(Received September 2021)

Abstract: This paper discusses the experimental research of W-band TE02 mode gyrotron traveling wave tube interaction, explores the reasons for adopting TE02 mode as the working mode, the existing competitive modes, the high-frequency structure adopted, the simulation of the interaction, and the design of the inner mode converter. Finally, the actual test results are given.

Keywords: W-band Gyro-TWT, TE02 mode, Periodic dielectric loaded, Electron flow rate, Inner mode converter

doi:

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