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

fYear

2007

fDate

21-23 March 2007

Firstpage

49

Lastpage

52

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;

fLanguage

English

Publisher

ieee

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

Type

conf

DOI

10.1109/IWAT.2007.370078

Filename

4227394