06907269 is referenced by 72 patents and cites 11 patents.

A mobile communication base station determines the oncoming direction of a radio wave with a simple arrangement and transmits a narrow angle beam in this direction. Received signals from a pair of wide angle beam antennae 21-1 and 21-2 having an equal configuration and a common orientation and which are located close to each other are fed to a direction finder receiver 22 and a communication receiver 15. By utilizing the fact that the both received signals have a coincident amplitude, a phase difference between the received signals is detected. The oncoming direction of the received radio wave (or the direction of a mobile station) is determined on the basis of the phase difference. A beam switcher 12 is controlled so as to connect a transmitter 13 to a narrow angle beam antenna (one of 11-1 to 11-4) which is directed in the oncoming direction thus determined.

Title
Mobile communication base station equipment
Application Number
9/968511
Publication Number
6907269 (B2)
Application Date
October 2, 2001
Publication Date
June 14, 2005
Inventor
Toshio Nojima
Yokosuka
JP
Noriyoshi Terada
Yokosuka
JP
Ryo Yamaguchi
Miura-gun
JP
Agent
Oblon Spivak McClelland Maier & Neustadt P C
Assignee
NTT DoCoMo
JP
IPC
H04M 001/00
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