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49 results on '"Lin, Mingtuan"'

23. A hybrid substrate integrated waveguide and spoof surface plasmon polariton leaky‐wave antenna with open stopband suppressed.

Author

Xu, Shen‐Da, Liu, Li, Guan, Dong‐Fang, Hong, Ren‐Tang, Xu, Hantao, Lin, Mingtuan, and Yong, Shao‐Wei

Subjects
POLARITONS, LEAKY-wave antennas, ANTENNA design, WIRELESS communications, ELECTRIC lines
Abstract

In this paper, an asymmetric sinusoidal modulated substrate integrated waveguide‐spoof surface plasmon polariton (SIW‐SSPP) leaky‐wave antenna with open stopband suppressed is proposed. The SSPP transmission line can covert the guided waves to the leaky‐wave radiations with frequency‐scanning properties due to the sinusoidal modulation. Using asymmetric model is an effective method to restrain the open stopband. The asymmetric radiating element with π/2 phase difference between the upper and lower sides of the top surface is introduced in the antenna to realize zero‐crossing beam scanning and unidirectional radiation characteristic. In the operating band of 12.6 to 13.7 GHz, the measured scanning angle of the fabricated antenna is from −14° to +34°. The gain is above 10.1 dBi and the radiation efficiency is basically above 50% over the operating band. Although the way of eliminate the open stopband has been proposed, this is the first time it is used in SIW‐SSPP antenna design. It has potential applications in radar and wireless communication systems for simple structure, low‐profile, zero‐crossing beam scanning, and unidirectional radiation performance. [ABSTRACT FROM AUTHOR]

Published
2022
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24. Switchable Metamaterial with Terahertz Buffering and Absorbing Performance

Author

Liu, Chenxi (author), Xu, Yanlin (author), Liu, H. (author), Lin, Mingtuan (author), Zha, Song (author), Liu, Chenxi (author), Xu, Yanlin (author), Liu, H. (author), Lin, Mingtuan (author), and Zha, Song (author)

Abstract

A terahertz metamaterial with switching characteristics from optical buffering to absorbing performance is realized by incorporating a phase-change film of vanadium dioxide. By introducing the electromagnetically induced transparency behavior based on simple strip pairs, the slow light effect with group delay up to 3.5 ps is obtained. When vanadium dioxide is in the insulator state, the remarkable delay can be observed as the incident pulse transmits through the designed structure. Once the vanadium dioxide film is tuned to the metallic state, the metamaterial is switched to a terahertz absorber and the maximum absorption rate of 94% is observed at 1.04 THz. The switching mechanism is discussed by analyzing the electric field and power loss distributions, as well as the impedance matching principle. Moreover, the buffering capability and the absorption performance both remain noticeable within a wide range of the incidence angle. This work offers a strategy for the function-switching metamaterial which provides potential applications in terahertz detecting, switching and slow light devices., Publisher Copyright: © 2009-2012 IEEE., Dynamics of Micro and Nano Systems

Published
2021
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