Title :
A Wideband Study of the Bandwidth, SAR and Radiation Efficiency of Mobile Terminal Antenna Structures
Author :
Villanen, Juha ; Poutanen, J. ; Icheln, C. ; Vainikainen, P.
Author_Institution :
IDC SMARAD, Helsinki Univ. of Technol., Espoo
Abstract :
In this paper, the frequency dependence of bandwidth, SAR and radiation efficiency of mobile terminal antennas are studied at wide frequency range, from 0.6 GHz to 6 GHz. Two antenna models are studied with simulations in free space and in talk-position beside a head model and two hand models. The results show a connection between chassis resonant frequencies, impedance bandwidth, SAR, and radiation efficiency, increase in SAR and decrease in radiation efficiency occur when bandwidth reaches its maximum due to a chassis resonance. Above 3 GHz this trend is shown to be not valid any more, as radiation of the antenna/coupling element become dominant. The results of the paper provide novel and useful information for the antenna designers of future mobile terminals
Keywords :
UHF antennas; antenna radiation patterns; broadband antennas; microwave antennas; mobile antennas; 0.6 to 6 GHz; SAR; bandwidth frequency dependence; chassis resonant frequencies; impedance bandwidth; mobile terminal antenna structures; radiation efficiency; wideband study; 3G mobile communication; Bandwidth; Broadband antennas; Current distribution; Frequency dependence; Impedance; Mobile antennas; Resonance; Telephone sets; Wireless LAN;
Conference_Titel :
Antenna Technology: Small and Smart Antennas Metamaterials and Applications, 2007. IWAT '07. International Workshop on
Conference_Location :
Cambridge
Print_ISBN :
1-4244-1088-6
Electronic_ISBN :
1-4244-1088-6
DOI :
10.1109/IWAT.2007.370078
