Ground Current Modification of Mobile Terminal Antennas and Its Effects

Author

Islam, Md Rashidul ; Ali, Mohammod

Author_Institution

Univ. of South Carolina, Columbia, SC, USA

Volume

10

fYear

2011

fDate

7/3/1905 12:00:00 AM

Firstpage

438

Lastpage

441

Abstract

In this letter, a dual-band parasitic radiator is de signed and optimized to modify the current distribution on the ground plane of a handheld terminal. Using a variable-length dual-band parasitic radiator, the ground current distribution is controlled, and low specific absorption rate (SAR) and high radiation efficiency at 900 and 1880 MHz are obtained. The proposed antenna scheme consisting of a dual-band parasitic element and a driven dual-band antenna reduces the peak SAR by 50% and 40% at 900 and 1880 MHz, respectively, compared to a conventional dual-band antenna. Significant increase in radiation efficiency is also obtained.

Keywords

current distribution; mobile antennas; multifrequency antennas; driven dual-band antenna; frequency 1880 MHz; frequency 900 MHz; ground current modification; handheld terminal; high radiation efficiency; mobile terminal antenna; specific absorption rate; variable-length dual-band parasitic radiator; Current distribution; Dual band; Metals; Mobile antennas; Phantoms; Handset antenna; RF exposure; parasitic radiator; radiation efficiency; specific absorption rate (SAR);

fLanguage

English

Journal_Title

Antennas and Wireless Propagation Letters, IEEE

Publisher

ieee

ISSN

1536-1225

Type

jour

DOI

10.1109/LAWP.2011.2149490

Filename

5762316