Human Operator Coupling Effects on Radiation Characteristics of a Portable Communication Dipole Antenna

H. R. Chuang

研究成果: Article同行評審

108 引文 斯高帕斯(Scopus)

摘要

EM coupling effects of a human operator on antenna radiation characteristics, such as the antenna input impedance, radiation patterns, the radiation power (into free space), the power absorbed by the body, the radiation efficiency, etc., of a portable communication dipole antenna were investigated in detail. A realistically shaped 3-D man model and a proximate linear dipole antenna were used to model this problem. Coupled integral equations (CIE) and the method of moments (MoM) were employed to numerically solve this antenna-body coupling problem. Numerical examples are presented for the antenna located in front of the head (distance ranging from 5 to 1 cm) or adjacent to the abdomen (0.6 cm distance) at 840 MHz. It is found that, when coupled with the operator body, the antenna input impedance will have significant deviation from those in free space and different positions. Due to the operator body absorption effect, the maximum attenuation of the H-plane antenna gain may reach about 15 dB for the antenna at the head position and 25 dB for the abdomen position, toward the direction of the body side. Also, the antenna radiation efficiency is reduced to the range from 0.72 to 0.29 for the head position and 0.15 for the abdomen position, respectively. Moreover, the cross-polarization field is significant, especially in the E plane of [formula ommited]. This is important for the antenna RF design and communication link budget consideration of portable radio systems.

原文English
頁(從 - 到)556-560
頁數5
期刊IEEE Transactions on Antennas and Propagation
42
發行號4
DOIs
出版狀態Published - 1994 4月

All Science Journal Classification (ASJC) codes

  • 電氣與電子工程

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