公开(公告)号：JP2006186749A

公开(公告)日：2006-07-13

申请号：JP2004379052

申请日：2004-12-28

Applicant: ATR ADVANCED TELECOMM RES INST

Inventor： IIGUSA KIYOUICHI ,  OHIRA TAKASHI ,  TAROUMARU MAKOTO ,  YAMAMOTO MAKOTO ,  SAWATANI TAKUMA

IPC: H01Q3/26 ,  H01Q5/15 ,  H01Q9/16 ,  H01Q21/30

Abstract: PROBLEM TO BE SOLVED: To provide an antenna assembly operable at a plurality of frequencies. SOLUTION: The antenna assembly 10 is provided with a conductor 1, a feed part 2, and an AC power supply 3. The conductor 1 is a dipole made of a columnar conductor. The conductor 1 has a length L approximately equal to λ, and a diameter r approximately equal to λ/50, when the wavelength of an electric wave is represented as λ. The feed part 2 is provided at a position separated only by a distance of about L/3 from one end 1A of the conductor 1. The power supply 3 supplies AC voltage to the feed part 2. COPYRIGHT: (C)2006,JPO&NCIPI

公开(公告)号：JP2006352206A

公开(公告)日：2006-12-28

申请号：JP2005171976

申请日：2005-06-13

Applicant: ATR ADVANCED TELECOMM RES INST

Inventor： TAROUMARU MAKOTO ,  OHIRA TAKASHI ,  ITO TAKASHI ,  YAMAMOTO MAKOTO ,  SAWATANI TAKUMA

IPC: H01Q3/44 ,  H01Q19/28

Abstract: PROBLEM TO BE SOLVED: To provide an array antenna system capable of easily improving bad display of a television receiver or hard-of-hearing of a radio receiver. SOLUTION: The array antenna system 100 includes an array antenna 10 and a control unit 20. The array antenna 10 includes a feeding element 2, parasitic elements 3, 4 and varactor diodes 6 to 9. The varactor diodes 6, 7 are loaded to the parasitic element 3, and the varactor diodes 8, 9 are loaded to the parasitic element 4. The control unit 20 includes a solar cell 22 and a control unit 23. The solar cell 22 receives light from a fluorescent light in a room to generate power, and the control unit 23 is started by a DC power from the solar cell 22. Upon the receipt of a particular signal from a remote controller 40, the control unit 23 applies control voltages CV1 to CV4 respectively to the varactor diodes 6 to 9 via control lines 12 to 15 to switch the directivity of the array antenna 10. COPYRIGHT: (C)2007,JPO&INPIT