Title :
Localized Exposure using an 8-shaped Loop Antenna System with a Director for Animal Study in 1.5 GHz Band
Author :
Kawai, H. ; Tanaka, S. ; Wake, K. ; Watanabe, S. ; Taki, M. ; Uno, T.
Author_Institution :
Nat. Inst. of Inf. & Commun. Technol., Tokyo
Abstract :
Until now, our group have proposed an 8-shaped loop antenna, which can realize the localized EMF exposure inside 4-, 8-, and 12-week-old rats´ brain in 1.5 GHz band. However, in juvenile rats, which is younger than 4-weekold, the localized exposure within the rats´ brain using this antenna is difficult. Therefore, in this paper, the 8-shaped loop antenna with a 0.3625lambda H-shaped director is proposed, to achieve the localized exposure within the juvenile rats´ brain in 1.5 GHz band. At first, the SAR in the 1-week-old rat is calculated using the FDTD method. As a result, the localized exposure within the rat using the antenna with director is 1.75 times higher than that without the director. In addition, the temperature-rise distribution within the rat phantom, which is exposed to the antenna with the director, is measured using the thermographic technique. As a result, the validity of the antenna with the director is confirmed.
Keywords :
UHF antennas; biological effects of fields; biomedical measurement; electric potential; finite difference time-domain analysis; FDTD method; eight-shaped loop antennas; localized EMF exposure; localized electromagnetic exposure; shaped loop antenna system; thermographic technique; Agriculture; Animals; Antenna measurements; Communications technology; Cranial; Dosimetry; Finite difference methods; Microwave antennas; Rats; Time domain analysis; 8-shaped loop antenna; FDTD method; H-shaped director; Thermographic technique; localized exposure;
Conference_Titel :
Microwave Conference, 2007. APMC 2007. Asia-Pacific
Conference_Location :
Bangkok
Print_ISBN :
978-1-4244-0748-4
Electronic_ISBN :
978-1-4244-0749-1
DOI :
10.1109/APMC.2007.4554825
