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Electronics and Telecommunications Research Institute (한국전자통신연구원)
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Time-reversal microwave focusing using multistatic data

  • Won-Young Song (Terrestrial and Nonterrestrial Integrated Telecommunications Research Laboratory, Electronics and Telecommunications Research Institute) ;
  • Soon-Ik Jeon (Terrestrial and Nonterrestrial Integrated Telecommunications Research Laboratory, Electronics and Telecommunications Research Institute) ;
  • Seong-Ho Son (Department of Mechanical Engineering, Soonchunhyang University) ;
  • Kwang-Jae Lee (Terrestrial and Nonterrestrial Integrated Telecommunications Research Laboratory, Electronics and Telecommunications Research Institute)
  • Received : 2022.11.23
  • Accepted : 2023.06.29
  • Published : 2024.04.20
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Abstract

Various techniques for noninvasively focus microwave energy on lesions have been proposed for thermotherapy. To focus the microwave energy on the lesion, a focusing parameter, which is referred to as the magnitude and phase of microwaves radiated from an external array antenna, is very important. Although the finite-difference time-domain (FDTD)-based time-reversal (TR) focusing algorithm is widely used, it has a long processing time if the focusing target position changes or if optimization is needed. We propose a technique to obtain multistatic data (MSD) based on Green's function and use it to derive the focusing parameters. Computer simulations were used to evaluate the electric fields inside the object using the FDTD method and Green's function as well as to compare the focusing parameters using FDTD- and MSD-based TR focusing algorithms. Regardless of the use of Green's function, the processing time of MSD-based TR focusing algorithms reduces to approximately 1/2 or 1/590 compared with the FDTD-based algorithm. In addition, we optimize the focusing parameters to eliminate hotspots, which are unnecessary focusing positions, by adding phase-reversed electric fields and confirm hotspot suppression through simulations.

Keywords

Acknowledgement

This work was supported by the Institute of Information & Communications Technology Planning & Evaluation (IITP) grant funded by the Korea government (MSIT) (no. 2021-0-00731).

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