DocumentCode :
2678936
Title :
Miniature dielectric-loaded personal telephone antennas with low SAR
Author :
Rosenberger, B.
Author_Institution :
Rosenberger HF, Tech. GmbH & Co., Germany
fYear :
1999
fDate :
21-24 Feb. 1999
Firstpage :
217
Lastpage :
221
Abstract :
The twisted loop or bifilar helix antenna is designed to minimise the specific absorption rate (SAR). It is basically a loop antenna which is balance fed at the top by a co-axial feed which passes axially through the centre. The lower portion of the antenna is a sleeve balun which creates a transition between single-ended and balanced drive so that the loop antenna can be fed with balanced currents. Currents at the centre conductor feed point of the antenna pass round a 360/spl deg/ path including the rim of the sleeve balun and then back to the outer conductor of the co-axial cable feed.
Keywords :
UHF antennas; antenna testing; baluns; dielectric-loaded antennas; helical antennas; loop antennas; mobile antennas; telephone sets; balanced currents; bifilar helix antenna; centre conductor feed point; co-axial feed; low SAR; miniature dielectric-loaded antenna; outer conductor; personal telephone antenna; personal telephone handsets; sleeve balun; specific absorption rate; twisted loop antenna; Antenna feeds; Dielectrics; Dipole antennas; Directive antennas; Helical antennas; Impedance matching; Polarization; Telephone sets; Telephony; Topology;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Technologies for Wireless Applications, 1999. Digest. 1999 IEEE MTT-S Symposium on
Conference_Location :
Vancouver, BC, Canada
Print_ISBN :
0-7803-5152-5
Type :
conf
DOI :
10.1109/MTTTWA.1999.755165
Filename :
755165
Link To Document :
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