The Journal of Korean Institute of Electromagnetic Engineering and Science (한국전자파학회논문지)

The Korean Institute of Electromagnetic Engineering and Science (한국전자파학회)
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SAR Analysis on the Coaxial-Slot Antenna for Hyperthermia

Hyperthermia용 Coaxial-Slot 안테나의 SAR 분석

  • Shin, Kook-Sun (Dept. of Computer and Communication Eng., Chungbuk Nat'l Univ.) ;
  • Shin, Ho-Sub (Dept. of Computer and Communication Eng., Chungbuk Nat'l Univ.) ;
  • Kim, Nam (Dept. of Computer and Communication Eng., Chungbuk Nat'l Univ.)
  • 신국선 (충북대학교 정보통신공학과) ;
  • 신호섭 (충북대학교 정보통신공학과) ;
  • 김남 (충북대학교 정보통신공학과)
  • Published : 2002.08.01
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Abstract

Performance of the applicator for hyperthermia is determined by both the degree of impedance matching and specific absorption rate(SAR) distribution in the surrounding tissue. In this paper, the coaxial-slot antenna using staircasing approximation in the FDTD is analyzed and the coaxial-slot antenna for the hyperthermia improving heating characteristics is designed. The SAR of the coaxial-slot antenna approximated to staircasing and square model is analyzed, and the SAR of staircasing model is compared with Saito's SAR measurement and square model. As a result, the SAR of proposed model exhibited agreement with the Saito's measurement of square model. Ig averaged SAR on the liver caused by proposed antenna in this paper is 195 W/kg, and is about 27.9 % higher than the Saito's antenna 152.5 W/kg, respectively.

고온온열치료(Hyperthermia)용 안테나의 성능은 안테나의 임피던스 매칭과 안테나 주위 조직의 SAR 분포에 의해서 결정된다. 본 논문에서는 FDTD 해석법을 이용하여 coaxial-slot 안테나를 계단형(staircasing)으로 근사화하여 분석하였고, 가열 특성을 개선시킬 수 있는 Hyperthermia용 안테나를 설계하였다. 계단형과 구형(square) 모델로 근사화한 coaxial-slot 안테나에서 간에 유기되는 SAR 값을 분석하였고 두 모델의 SAR 값을 Saito의 측정결과와 비교해 보았으며 그 결과 계단형 모델이 구형 모델 보다 측정결과에 가까운 것을 확인할 수 있었다. 본 논문에서 제안하는 안테나에서 유기되는 SAR 값은 1g 평균 첨두치가 195 W/kg으로 Saito가 제안한 안테나의 SAR 값인 152.5 W/kg에 비해 대략 27.9 %도 증가한 값으로 나타났다.

Keywords

References

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