DocumentCode :
2163127
Title :
Optimized helical monopole antennas for portable VHF communication devices
Author :
Zhao, Shifu ; Fumeaux, Christophe ; Coleman, Chris
Author_Institution :
Sch. of Electr. & Electron. Eng., Univ. of Adelaide, Adelaide, SA, Australia
fYear :
2012
fDate :
8-14 July 2012
Firstpage :
1
Lastpage :
2
Abstract :
The helical monopole antenna has been used extensively as compact antenna for portable VHF communication devices. Conventionally, it has a constant pitch and radius along its body, these being chosen to make the antenna resonant at the frequency of interest. By allowing both radius and pitch to vary along the antenna, it is possible to optimize the antenna in terms of efficiency and bandwidth. The current paper investigates the effect of antenna environment upon such optimizations and, in particular, the situation where the VHF antenna is fed against a small radio casing instead of a perfect ground plane. It is shown that the optimization is little affected by such changes to environment and that the optimized designs are robust. The current paper concentrates on optimizations of pitch since helix radius will need to be constrained in the case of a portable radio.
Keywords :
VHF antennas; antenna feeds; mobile handsets; monopole antennas; VHF antenna; antenna effect; antenna fed; antenna resonant; helix radius; optimized helical monopole antennas; perfect ground plane; portable VHF communication devices; portable radio; radio casing; Bandwidth; Helical antennas; Metals; Optimization; Robustness; Wires;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Antennas and Propagation Society International Symposium (APSURSI), 2012 IEEE
Conference_Location :
Chicago, IL
ISSN :
1522-3965
Print_ISBN :
978-1-4673-0461-0
Type :
conf
DOI :
10.1109/APS.2012.6349378
Filename :
6349378
Link To Document :
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