Title :
Directional antenna for portable telephones
Author :
Noguchi, Kay ; Ando, Makoto ; Goto, Nao-hisa ; Hirose, Masa-nobu ; Uno, Toru ; Kamimura, Yoshi-tsugu
Author_Institution :
Tokyo Inst. of Technol., Japan
Abstract :
Advantages of the use of directional antenna patterns for portable telephones are demonstrated. They contribute to (1) reduction of power absorption into the head, (2) reduction of multipath interference, and (3) power saving and increase of battery lifetime. The paper compares directional and omni-directional antennas with the human head existing near them, in terms of radiation patterns and absorbed power. It is pointed out that overall radiation patterns are more or less directive for both types of patterns, while power absorption into the head is much smaller for directional antenna
Keywords :
antenna radiation patterns; biological effects of fields; directive antennas; electromagnetic wave absorption; interference suppression; land mobile radio; mobile radio; multipath channels; radiofrequency interference; telephone sets; absorbed power; battery lifetime; directional antenna patterns; human head; multipath interference; portable telephones; power absorption; power saving; Absorption; Antenna radiation patterns; Batteries; Dielectric losses; Dipole antennas; Directional antennas; Directive antennas; Head; Humans; Telephony;
Conference_Titel :
Universal Personal Communications. 1995. Record., 1995 Fourth IEEE International Conference on
Conference_Location :
Tokyo
Print_ISBN :
0-7803-2955-4
DOI :
10.1109/ICUPC.1995.496923
