Title :
Elevation Plane Beam Scanning of a Novel Parasitic Array Radiator Antenna for 1900 MHz Mobile Handheld Terminals
Author :
Islam, Md Rashidul ; Ali, Mohammod
Author_Institution :
Dept. of Electr. Eng., Univ. of South Carolina, Columbia, SC, USA
Abstract :
A novel internal antenna system is introduced for the GSM 1900 MHz frequency band which utilizes the electrically steerable parasitic array radiator (ESPAR) concept to steer the elevation plane beam in specific angular directions. The proposed antenna consists of a planar inverted-F antenna (PIFA) as the driven element and two inverted L antennas (ILAs) as parasitic elements. The ILAs are terminated with capacitive impedances at their bases. Full-wave analysis shows that the radiation beam can be scanned in space when the antenna is in free space as well as next to human head and hand phantoms. Measured results using varactor diodes controlling the base reactances show good return loss bandwidth.
Keywords :
UHF antennas; antenna arrays; antenna radiation patterns; beam steering; cellular radio; mobile antennas; planar inverted-F antennas; GSM; ILA; PIFA; antenna radiation beam; capacitive impedances; electrically steerable parasitic array radiator antenna; elevation plane beam scanning; frequency 1900 MHz; internal antenna system; inverted L antennas; mobile handheld terminals; planar inverted-F antenna; varactor diodes; Antenna arrays; Antenna measurements; Directive antennas; Frequency; GSM; Humans; Imaging phantoms; Impedance; Loss measurement; Mobile antennas; Beam steering; ESPAR antenna; PIFA; SAR;
Journal_Title :
Antennas and Propagation, IEEE Transactions on
DOI :
10.1109/TAP.2010.2055798
