論文

2022年4月

Antenna Characteristics of Helical Coil with 2.45 GHz Semiconductor Microwave for Microwave-Enhanced Laser-Induced Breakdown Spectroscopy (MW-LIBS)

Materials
  • Yuji Ikeda
  • ,
  • Yoshihiko Hirata
  • ,
  • Joey Kim Soriano
  • ,
  • Ikuo Wakaida

15
8
開始ページ
2851
終了ページ
2851
記述言語
掲載種別
研究論文(学術雑誌)
DOI
10.3390/ma15082851
出版者・発行元
{MDPI} {AG}

A copper helical coil antenna was developed, characterized, and optimized for 2.45 GHz operations supplied by a microwave semiconductor oscillator. The application field of interest is laser-induced breakdown spectroscopy enhanced by microwave. Simulations using the Ansys HFSS demonstrate the superior localized E-field strength of the helical coil antenna, compared with other antenna-type structures. Simulation results show that E-field strength at the tip of the antenna has a logarithmic trend for increasing the coil pitch. The optimum pitch is 5 mm for a coil diameter of 6.5 mm upon consideration of the system compactness. Despite the antenna’s open-circuit end, the presence of target samples does not interfere with the E-field and H-field distribution of the antenna and the surrounding environment. Applications in microwave-enhanced laser-induced breakdown spectroscopy (MWLIBS) confirm the importance of the antenna reflector. The electric field strength was over 100 times higher than the previous capacitor-like antenna. The antenna configuration angle was then experimentally optimized for maximum enhancement effects in the spectrochemical analysis of Al2O3. The antenna angle of 60° from the laser beam propagation achieved maximum enhancement in the emission signal of Al I.

リンク情報
DOI
https://doi.org/10.3390/ma15082851
URL
https://www.mdpi.com/1996-1944/15/8/2851
ID情報
  • DOI : 10.3390/ma15082851
  • eISSN : 1996-1944
  • ORCIDのPut Code : 111561671

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