公开(公告)号：EP1589610A4

公开(公告)日：2007-02-14

申请号：EP04700773

申请日：2004-01-08

Applicant: ATR ADVANCED TELECOMM RES INST

Inventor： SAWATANI TAKUMA ,  IIGUSA KYOICHI ,  TAROMARU MAKOTO ,  OHIRA TAKASHI ,  ARAKI KOUJI

IPC: H01Q3/44 ,  H01Q9/30 ,  H01Q19/32 ,  H04B7/08

CPC classification number: H01Q1/2266 ,  H01Q1/2275 ,  H01Q1/242 ,  H01Q3/44 ,  H01Q9/30 ,  H01Q19/32 ,  H04B7/086

Abstract: An array antenna device (100) includes an excitation element (A0) for receiving a radio signal transmitted, two non-excitation elements (A1, A2), and two variable reactance elements (12-1, 12-2) connected to the non-excitation elements (A1, A2), respectively. By changing the reactance value set in them, the directivity characteristic is changed. In order to obtain a diversity gain above a predetermined value according to the radio signal received, an antenna controller (10) selects and sets one reactance value set according to the signal quality of each radio signal for the two valuable reactance elements (12-1, 12-2) from a first case when a first reactance value set is set and a second case when a second reactance value set is set.