Naslov
Analysis of GSM Base Station Antenna Near Conductive Object : Estimating EM Field Levels in the Near Field

Autori
Šarolić, Antonio ; Poljak, Dragan ; Modlic, Borivoj

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
ICECom 2003 : conference proceedings / Bonefačić, Davor - Zagreb : Hrvatsko društvo za komunikacije, računarstvo, elektroniku, mjerenja I automatiku (KoREMA), 2003, 225-228

ISBN
953-6037-39-4

Skup
17th International Conference on Applied Electromagnetics and Communications

Mjesto i datum
Dubrovnik, Hrvatska, 01.10.2003. - 03.10.2003

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
base station antenna; near field; EM field estimation

Sažetak
When estimating the potential radiation hazard of a base station antenna system, one often relies on the antenna far-field radiation pattern, while the estimation often refers to the antenna near-field zone. It is widely accepted that this leads to overestimation of the field amplitudes. This work analyzes the typical sector antenna, widely used in GSM system. Antenna near field distribution is calculated using NEC2, for various configurations of antenna installations. Analysis of the antenna in free space shows that the overestimation only happens in the mainlobe, while in all other directions even underestimation can happen. Furthermore, conductive objects in close proximity of the antenna, like in widely-used multiple-antenna configurations, can significantly distort the radiation pattern in a generally unknown manner, leading to unexpected higher amplitudes in the unknown directions. For truly conservative, worst-case EM field estimation, this should be taken into account. The paper concludes with some guidelines on using the modified radiation pattern for such estimation.

Izvorni jezik
Engleski

Znanstvena područja
Elektrotehnika

POVEZANOST RADA