| Project/Area Number |
10837001
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
電磁場環境
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| Research Institution | TOHOKU UNIVERSITY |
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Principal Investigator |
SAWAYA Kunio GRADUATE SCHOOL OF ENGINEERING, TOHOKU UNIVERSITY PROFESSOR, 大学院・工学研究科, 教授 (60108470)
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| Co-Investigator(Kenkyū-buntansha) |
IGARI Kazuhisa SCHOOL OF ENGINEERING, TOHOKU UNIVERSITY TECHNICAL STAFF, 工学部, 教務職員 (10250705)
CHEN Qiang GRADUATE SCHOOL OF ENGINEERING, TOHOKU UNIVERSITY RESEARCH ASSOCIATE, 大学院・工学研究科, 助手 (30261580)
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| Project Period (FY) |
1998 – 1999
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| Project Status |
Completed (Fiscal Year 1999)
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| Budget Amount *help |
¥3,200,000 (Direct Cost: ¥3,200,000)
Fiscal Year 1999: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 1998: ¥2,200,000 (Direct Cost: ¥2,200,000)
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| Keywords | ANTENNA / RADIATION EFFICIENCY / HUMAN PHANTOM / POWER ABSORPTION / SPHERICAL SCAN / PORTABEL TELEPHONE / RADIATION POWER / MOBILE COMMUNICATION |
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| Research Abstract |
It is very important to measure the absorbed power by human body in the vicinity of radio equipments such as the portable telephones and the personal handy phone systems (PHS) when designing antennas. In this research project, a method based on the pattern integration method for measuring the power absorption by the human body in the vicinity of antenna, in which the antenna and the human model are rotated along azimuth direction and the receiving antenna is rotated along the elevation direction, has been proposed and following results have been obtained.
(1) The radiation efficiency of the half-wavelength dipole antenna has been measured by using the proposed method and compare with the results by the random field method. It has been shown that the accuracy of the proposed method is higher than that of the random field method.
(2) High-speed and automatic measuring system has been developed by controlling the rotators by personal computer.
(3) The radiation efficiency of the half-wavelength dipole antenna and a monopole antenna mounted on the body of portable telephone in the vicinity of the COST 244 head phantoms has been measured. The results have been compare with the numerical results obtained by the FDTD (Finite Difference Time Domain) method confirming the validity and the high accuracy of the propose method. It has been also pointed out that the absorption power of the spherical phantom is smaller than that of the cubic phantom.
(4) A monopole array antenna based on the principle of the Yagi-Uda antenna and a low-profile loop array antenna have been designed to reduce the absorbed power by using the FDTD method. It has been confirmed numerically and experimentally that the radiation efficiency of the designed antennas is higher than the usual monopole antenna.
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