Complex permittivity measurements of steel fiber-reinforced cementitious composites using a free-space reflection method with a focused beam lens horn antenna

Kyeongyong Cho, Sunghui Jo, Yeong Hoon Noh, Namkon Lee, Sungwook Kim, Jong Gwan Yook

Research output: Contribution to journalArticlepeer-review

Abstract

To measure the electromagnetic properties of steel fiber-reinforced concrete (SFRC) in the X-band, 1-port measurements were performed using a lens horn antenna in a free-space measurement system. Free-space 1-port calibration with translations of the position of the reflector regarding the characteristics of the focused beam lens horn antenna was applied. The intrinsic impedance and complex permittivity of the SFRC were obtained from the measured reflection characteristics. The steel fiber content increased and the electromagnetic properties of the SFRC gradually changed from a dielectric to a conductor, even in very low frequencies compared to the plasma frequencies of general metal, which are optical frequencies. This is considered to be the plasmon effect of the metallic structure formed by the steel fiber. This result is applicable for analyses of the electromagnetic phenomenon of large structures with fiber content.

Original languageEnglish
Article number7789
JournalSensors
Volume21
Issue number23
DOIs
Publication statusPublished - 2021 Dec

Bibliographical note

Funding Information:
This research was supported by a grant (21SCIP-B146646-04) from the Construction Technology Research Project funded by the Ministry of Land, Infrastructure and Transport of the Korean Government.

Publisher Copyright:
© 2021 by the authors. Licensee MDPI, Basel, Switzerland.

All Science Journal Classification (ASJC) codes

  • Analytical Chemistry
  • Information Systems
  • Atomic and Molecular Physics, and Optics
  • Biochemistry
  • Instrumentation
  • Electrical and Electronic Engineering

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