Uplink beam steering using the intelligent quadrifilar helix antenna

The paper investigates the uplink beam steering potential of the intelligent quadrifilar helix antenna (IQHA) (see Agius, A.A. and Saunders, S.R., UK Patent No. 9803273.3, 1998). The approach relies on producing a variable radiation pattern by adjusting the phase relationships between its elements....

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Bibliographic Details
Published inTwelfth International Conference on Antennas and Propagation (ICAP 2003) pp. 190 - 193
Main Authors Chew, K.C.D, Saunders, S.R
Format Conference Proceeding
LanguageEnglish
Published London IEE 2003
Subjects
Antenna arrays
phase quadrature feed
SAR
helical antennas
intelligent quadrifilar helix antenna
microstrip antenna arrays
uplink beam steering
antenna mobile systems
variable radiation pattern
beam steering
meander line printed quadrifilar helix antenna
antenna radiation patterns
near-field coupling
UHF antennas
specific absorption rate
antenna feeds
2 GHz
digital phase shifters
mobile antennas
base station
antenna array
phantom head
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Summary:The paper investigates the uplink beam steering potential of the intelligent quadrifilar helix antenna (IQHA) (see Agius, A.A. and Saunders, S.R., UK Patent No. 9803273.3, 1998). The approach relies on producing a variable radiation pattern by adjusting the phase relationships between its elements. The paper presents results obtained from an investigation of the effects of applying different weights to the individual elements of a meander line printed QHA (MPQHA) structure (see Chew, K.C.D. and Saunders, S.R., UK Patent Application No. 0204014.5, 2002) using a real time demonstrator. Appropriate sets of weights were identified with the aid of a numerical far-field simulation to maximise radiation in the direction of the base station and reduce losses in the head. The real time demonstrator uses a micro-controller to feed the identified weights through the digital phase shifters on the individual elements of the MPQHA structure. The measured radiation patterns are compared to the radiation pattern measured from a MPQHA with conventional phase quadrature feed. Measurements were made both in free space and in the presence of a phantom head so as to demonstrate the impact of near-field coupling. The specific absorption rate (SAR) was also monitored.
ISBN:9780852967522
0852967527
DOI:10.1049/cp:20030047