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Directional Antennas for Portable Telephones
Kay NOGUCHI Makoto ANDO Nao-hisa GOTO Masa-nobu HIROSE Toru UNO Yoshi-tsugu KAMIMURA
IEICE TRANSACTIONS on Communications
Publication Date: 1996/09/25
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,
Full Text: PDF(641.1KB)>>
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.