NDLI: Multi-antenna system for a handy phone to reduce influence by user's hand

Content Provider	IEEE Xplore Digital Library
Author	Nishikido, T. Saito, Y. Hasegawa, M. Haruki, H. Koyanagi, Y. Egawa, K.
Copyright Year	2003
Description	Author affiliation: Kanazawa R&D Lab. Co., Ltd., Japan (Nishikido, T.; Saito, Y.)
Abstract	A multi-antenna system without any switching circuits, which is suitable for the CDMA handy phone is proposed. The proposed antenna system is composed of the two quarter wavelength monopole antennas (QMPA) located at the top and bottom of the handy phone, and the two QMPAs are simultaneously fed through a power divider in phase and same amplitude. The radiation efficiency is measured in three conditions that upper, center and lower portions of the handy phone are held by user's hand in the talk position. The radiation efficiency is generally high in the all conditions even if one of the QMPAs is wrapped by the hand. The proposed antenna system is effective to reduce the influence by user hand. Moreover, the phase difference in feed circuit is varied by inserting a phase sifter between the power divider and the QMPA. As a result, slight variation of the radiation pattern radiated from the two QMPAs is not effective for further improvement of radiation efficiency in the talk position.
Sponsorship	Chinese Inst. of Electron. IEEE Beijing Section IEE Beijing Branch China Committee for URSI
Starting Page	348
Ending Page	351
File Size	242063
Page Count	4
File Format	PDF
ISBN	0780378318
DOI	10.1109/ISAPE.2003.1276699
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2003-10-28
Publisher Place	China
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Multiaccess communication Power dividers Telephone sets Switching circuits Antenna measurements Feeds Diversity reception Time division multiple access Phased arrays Antenna radiation patterns
Content Type	Text
Resource Type	Article

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