论文信息 - Ground Current Modification of Mobile Terminal Antennas and Its Effects

Ground Current Modification of Mobile Terminal Antennas and Its Effects

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.

Mohammod Ali | M. R. Islam | Mohammod Ali | Md Rashidul Islam

[1] Osamu Fujiwara,et al. Reduction of Electromagnetic Absorption in the Human Head for Portable Telephones by a Ferrite Sheet Attachment , 1997 .

[2] Eli Yablonovitch,et al. A high-impedance ground plane applied to a cellphone handset geometry , 2001 .

[3] P. Vainikainen,et al. Resonator-based analysis of the combination of mobile handset antenna and chassis , 2002 .

[4] M. Sager,et al. A novel technique to increase the realized efficiency of a mobile phone antenna placed beside a head-phantom , 2003, IEEE Antennas and Propagation Society International Symposium. Digest. Held in conjunction with: USNC/CNC/URSI North American Radio Sci. Meeting (Cat. No.03CH37450).

[5] Jiunn-Nan Hwang,et al. Reduction of the Peak SAR in the Human Head With Metamaterials , 2006, IEEE Transactions on Antennas and Propagation.

[6] Byungje Lee,et al. Designing ground plane to reduce hand effects on mobile handsets , 2007, 2007 IEEE Antennas and Propagation Society International Symposium.

[7] J. Kwon,et al. Experimental tests of SAR reduction on mobile phone using EBG structures , 2008 .

[8] R. Valkonen,et al. Near-Field Control of Handset Antennas Based on Inverted-Top Wavetraps: Focus on Hearing-Aid Compatibility , 2009, IEEE Antennas and Wireless Propagation Letters.

[9] Mohammod Ali,et al. Elevation Plane Beam Scanning of a Novel Parasitic Array Radiator Antenna for 1900 MHz Mobile Handheld Terminals , 2010, IEEE Transactions on Antennas and Propagation.