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

The Korean Institute of Electromagnetic Engineering and Science (한국전자파학회)
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Fabrication of Multiple-Frequency Exposure System for In Vitro Experiment

세포 실험용 다중 주파수 동시 노출 장치 제작

  • Kim, Tae-Hong (ElectroMagnetic Environment Research Center in Chungnam National University) ;
  • Seo, Min-Gyeong (Department of Radio Science and Engineering, Chungnam National University) ;
  • Mun, Ji-Yeon (Department of Radio Science and Engineering, Chungnam National University) ;
  • Pack, Jeong-Ki (Department of Radio Science and Engineering, Chungnam National University)
  • 김태홍 (충남대학교 전자파환경기술연구센터) ;
  • 서민경 (충남대학교 전파공학과) ;
  • 문지연 (충남대학교 전파공학과) ;
  • 백정기 (충남대학교 전파공학과)
  • Received : 2012.01.11
  • Accepted : 2012.01.26
  • Published : 2012.02.29
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Abstract

Recently, we are simultaneously exposed by various electromagnetic sources due to an increase of mobile communication services. However, EMF(Electric, Magnetic and Electromagnetic Field) study has been performed mainly about only single frequency. The objective of this paper is to develop an multiple-frequency exposure system for in vitro experiment. The exposure unit for in vitro experiments was designed by radial transmission line type to get broadband characteristics to generate signals of CDMA at 836.5 MHz and WCDMA at 1950 MHz frequency simultaneously. The modulated signals were delivered to the conical antenna through amplifier, digital attenuator and RF combiner. SAR values were obtained by the averaged values of 3 measured values at 9 points in petri dish using the fiber optic temperature probe. The measured return loss was under -15 dB. For 1 W input power, the mean value and standard deviation of SAR were $0.105{\pm}0.019$ for the CDMA frequency and $0.262{\pm}0.055$ for the WCDMA frequency.

최근 이동 통신 서비스의 증가로 인해 인류는 다양한 전자파에 동시 노출되어 있다. 그러나 전자파의 인체 영향 연구는 주로 단일 주파수에 대해서 행해졌다. 본 논문에서는 다중 주파수의 전자파를 동시에 노출시킬 수 있는 세포 실험 장치를 제작하였다. 세포 실험 장치는 836.5 MHz 주파수의 CDMA(Code Division Multiple Access) 및 1,950 MHz의 WCDMA(Wideband Code Division Multiple Access) 주파수의 신호를 동시에 발생시킬 수 있도록 광대역 특성을 갖는 radial transmission line 형으로 구성하였다. 변조된 신호는 증폭기, 디지털 감쇄기, RF 결합기를 통하여 원추형 안테나로 전달된다. SAR(Specific Absorption Rate)값은 광학 온도 프로브를 이용하여 petri dish 내 9개 지점에 대하여 3회 측정한 평균값을 이용하여 측정하였다. 측정된 안테나의 반사 손실은 -15dB 이하였고, 단위 입력 전력당 SAR 평균과 표준 편차는 CDMA 주파수에서 $0.105{\pm}0.019$ W/kg, WCDMA 주파수에서 $0.262{\pm}0.055$ W/kg이었다.

Keywords

References

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