DocumentCode :
471083
Title :
Multiple Antenna Concept based on Characteristic Modes of Mobile Phone Chassis
Author :
Chaudhury, S.K. ; Schroeder, Werner L. ; Chaloupka, H.J.
Author_Institution :
Siemens AG, Munich
fYear :
2007
fDate :
11-16 Nov. 2007
Firstpage :
1
Lastpage :
6
Abstract :
All the concepts of multiple antenna for a small device are backed by the idea that the radiation properties are dominantly controlled by an antenna structure which is attached to the device. However, for typical handheld devices this assumption is no more valid. It is known that radiation from small devices is dominated by contributions from the chassis. This fact is used in our novel concept which considers the chassis as an antenna. Selective excitation of individual orthogonal characteristic mode currents on the chassis constitute the basis for a multiple antenna system. A feed network composed of 180deg hybrid couplers provide very good isolation between system ports. However, due to difference in mode impedances special measure must be taken to simultaneously match all the ports.
Keywords :
antenna feeds; antenna radiation patterns; electric connectors; mobile antennas; mobile handsets; multifrequency antennas; antenna structure; feed network; handheld devices; hybrid couplers; mobile phone chassis characteristic modes; mode impedances; multiple antenna concept; radiation properties; 180-degree hybrid coupler; Mobile antenna; characteristic mode; diversity; matching;
fLanguage :
English
Publisher :
iet
Conference_Titel :
Antennas and Propagation, 2007. EuCAP 2007. The Second European Conference on
Conference_Location :
Edinburgh
Print_ISBN :
978-0-86341-842-6
Type :
conf
Filename :
4458807
Link To Document :
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