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Analysis of Near Field for Base Station Panel Antenna(4 X 2 Dipole Array)  

Lee, Dugro (Middle Regional Network Division, SK Telecome)
Park, Ju-Derk (EME Team, Radio Technology Research Group, ETRI)
Choi, Jae-Ic (EME Team, Radio Technology Research Group, ETRI)
Kim, Nam (Dept. of Computer & Communication Engineering, Chungbuk National University)
Publication Information
The Journal of Korean Institute of Electromagnetic Engineering and Science / v.15, no.5, 2004 , pp. 473-479 More about this Journal
Abstract
In this paper, power density in near field is calculated about analytic object which has comparatively large volume in considering used wavelength such as cellular base station antenna. Panel sector antenna which is used widespreadly in domestic cellular wireless communication system is modeled and electromagnetic field distribution in reactive near field region is calculated by FDTD (Finite Difference Time Domain) method. After that, antenna gain in far field region is obtain by near to far transformation. Power spectral density in radiated near field is calculated in applying to gain-based model with antenna gain in far field. Finally, compliance distance is obtained in considering the result from radiated near field calculation and basic restrictions on occupational and general public exposure limits in ICNIRP guideline. In the center of main radiating position, the result from gain-based model is -14.55 ㏈m and the result from surface scanning method is -15.75 ㏈m. When the losses from cables and connectors used in measurement are considered, the results from gain-based model and surface scanning method are nearly coincident.
Keywords
FDTD; Antenna Modeling; Near Field; Compliance Distance;
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