Directional Antennas for Portable Telephones

Kay NOGUCHI  Makoto ANDO  Nao-hisa GOTO  Masa-nobu HIROSE  Toru UNO  Yoshi-tsugu KAMIMURA  

IEICE TRANSACTIONS on Communications   Vol.E79-B    No.9    pp.1234-1241
Publication Date: 1996/09/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Personal Communications)
Category: Antenna and diversity techniques
directional antennas,  portable telephones,  radiation patterns,  power absorption,  

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The advantages of the use of directional antennas for portable telephones are demonstrated. They contribute to (1) reduction of power absorption into a head, (2) reduction of multi-path interference, and (3) power saving and increase of a battery life time. This paper compares directional and omni-directional antennas existing near the head of operator, in terms of radiation patterns with a head and the power absorbed into a head. It is pointed out that radiation patterns with a head are more or less directive for both types of antennas, while the power absorbed into a head is much smaller for directional antennas.