Title :
Intelligent quadrifilar helix antenna
Author :
Leach, S.M. ; Agius, A.A. ; Saunders, S.R.
Author_Institution :
Centre for Commun. Syst. Res., Surrey Univ., Guildford, UK
fDate :
6/1/2000 12:00:00 AM
Abstract :
The concept of the intelligent quadrifilar helix antenna (I-QHA) as an antenna for handheld mobile terminals is detailed. The potential advantages of using the I-QHA in both terrestrial and satellite mobile communications are presented. The I-QHA may be used as a multiband or multimode antenna, allowing a handset to operate in different frequency bands and in both terrestrial and satellite communications environments. The adaptive matching component of the I-QHA not only matches the antenna for different frequency bands, but counters the detuning effects caused by the user. Finally, diversity gain improvements of up to 14 dB in heavily shadowed environments, achieved by implementing diversity techniques on the elements of the I-QHA, are demonstrated
Keywords :
adaptive antenna arrays; diversity reception; helical antennas; impedance matching; land mobile radio; mobile antennas; mobile satellite communication; satellite antennas; I-QHA; adaptive matching; detuning effects; diversity gain improvements; diversity techniques; frequency bands; handheld mobile terminals; heavily shadowed environments; intelligent quadrifilar helix antenna; multiband antenna; multimode antenna; satellite mobile communications; terrestrial mobile communications;
Journal_Title :
Microwaves, Antennas and Propagation, IEE Proceedings
DOI :
10.1049/ip-map:20000402
