Study on Metalwork Technologies using Metal Plate Materials of Baekje - Focusing on Gilt Bronze Crowns and Gilt Bronze Shoes -

AbstractAn electromagnetic pulse (EMP) with high energy can damage electronic equipment instantly within a wide range of thousands of kilometers. Generally, a metal plate placed inside a thick concrete wall is used against an EMP, but it is not suitable for an EMP shielding window, which requires not only strong shielding effectiveness (SE) but also optical transparency (OT). In this paper, we propose a very thin and optically transparent structure with excellent SE for EMP shielding window application. The proposed structure consists of a saltwater layer held between two glass substrates and two metal mesh layers on the outside of the glass, with a total thickness of less than 1.5 cm. The SE and OT of the structure are above 80 dB and 45%, respectively, which not only meet the requirement of EMP shielding for military purposes but also retain the procedure of good observation. Moreover, the OT of the structure can be significantly improved using only one metal mesh film (MMF) layer, while the SE is still maintained high to satisfy the required SE for home applicants. With the major advantages of low cost, optical transparency, strong SE, and flexible performance, the proposed structure can be considered a good solution for transparent EMP shielding windows.

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An Infrared Thermal Imaging Approach with Cooling Pre-treatment for Monitoring Cracks inside Metal Plate

2020 Chinese Automation Congress (CAC) ◽

10.1109/cac51589.2020.9327851 ◽

2020 ◽

Author(s):

XiaoDong Feng ◽

ZongShu Li ◽

RuiQi Zhang

Keyword(s):

Thermal Imaging ◽

Metal Plate ◽

Infrared Thermal Imaging ◽

Imaging Approach ◽

Pre Treatment

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Tilted-Beam Antenna Based on SSPPs-TL with Stable Gain

Sensors ◽

10.3390/s21093288 ◽

2021 ◽

Vol 21 (9) ◽

pp. 3288

Author(s):

Dujuan Wei ◽

Youlin Geng ◽

Pengquan Zhang ◽

Zhonghai Zhang ◽

Chuan Yin

Keyword(s):

Surface Plasmon ◽

Slow Wave ◽

Surface Plasmon Polaritons ◽

Transmission Lines ◽

Design Theory ◽

Metal Plate ◽

Wave Radiation ◽

Gain Bandwidth ◽

Plasmon Polaritons ◽

Spoof Surface Plasmon Polaritons

In this paper, a titled-beam antenna based on spoof surface plasmon polaritons (SSPPs) transmission lines (TLs) is proposed. The parallel SSPPs-TL is a slow-wave TL, which is able to limit waves in the TL strictly. By periodically introducing a set of tapered stubs along the SSPPs-TL, the backward endfire beams are formed by the surface waves in the slow-wave radiation region. Then, through the placement of a big metal plate below the endfire antenna, the backward endfire beams are tilted, and the tilted angle of the beams are steered by the distance of the metal plate and antenna. Over the band of 5.7 GHz~7.0 GHz, the tilted antenna performs constant shapes of radiation patterns. The gain keeps stable at around 12 dBi and the 1-dB gain bandwidth is 20%. The measured results of the fabricated prototypes confirm the design theory and simulated results.

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