公开(公告)号：JP2006352659A

公开(公告)日：2006-12-28

申请号：JP2005178015

申请日：2005-06-17

Applicant: SANYO ELECTRIC CO ,  ATR ADVANCED TELECOMM RES INST

Inventor： YAMAMOTO MAYUMI ,  TAROUMARU MAKOTO ,  SAWATANI TAKUMA ,  HANABUSA KIYOO

IPC: H01Q3/24 ,  H01Q3/46 ,  H01Q19/30

Abstract: PROBLEM TO BE SOLVED: To provide an array antenna unit having directivity also in the direction parallel to a power feed element and a non-power feed element. SOLUTION: An array antenna unit 50 includes antenna element groups 2, 3. The antenna element group 2 includes a power feed element 21 and non-power feed elements 22, 23 disposed on a main surface 1A of a dielectric substrate 1, while groups of the antenna elements 3 include a power feed element 31 and non-power feed elements 32, 33 disposed on the main surface 1B of the dielectric substrate 1. The power feed element 21 and the non-power feed elements 22, 23 are substantially orthogonal with the power feed element 31 and the non-power feed elements 32, 33. Switches 7, 8 are connected to between two terminals arbitrarily selected from among terminals T1-T4. Varactor diodes 223, 233, 323, 333 are respectively mounted on the non-power feed elements 22, 23, 32, 33. A control circuit 13 applies direct current voltages Vc having different polarity to the varactor diodes 223, 233, 323, 333. COPYRIGHT: (C)2007,JPO&INPIT

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

公开(公告)号：JP2006324870A

公开(公告)日：2006-11-30

申请号：JP2005145337

申请日：2005-05-18

Applicant: DOSHISHA ,  ATR ADVANCED TELECOMM RES INST

Inventor： SASAOKA SHUICHI ,  AONO TOMOYUKI ,  HIGUCHI KEISUKE ,  ITO TAKASHI ,  TAROUMARU MAKOTO

IPC: H04L9/08

Abstract: PROBLEM TO BE SOLVED: To provide a radio communication system in which tapping of a private key can be suppressed. SOLUTION: A radio device 10 and an antenna 11 are built in the mouse 60 of a personal computer and in this state, (n) radio waves are sent and received between radio devices 10 and 30 while the directivity of an array antenna 20 is switched to (n) directivities. The radio device 10 detects (n) first radio wave intensities corresponding to the (n) first radio waves received from the radio device 30 and generates a private key Ks1 composed of a bit series on the basis of the (n) detected first radio wave intensities. Further, the radio device 30 detects (n) second radio wave intensities corresponding to the (n) second radio waves received from the radio device 10 and generates a private key Ks2 composed of the same bit series with the private key Ks1 on the basis of the (n) detected second radio wave intensities. COPYRIGHT: (C)2007,JPO&INPIT

公开(公告)号：JP2006186540A

公开(公告)日：2006-07-13

申请号：JP2004376384

申请日：2004-12-27

Applicant: MURATA MANUFACTURING CO ,  ATR ADVANCED TELECOMM RES INST

Inventor： FURUTOI TOMOSHIGE ,  TAROUMARU MAKOTO ,  HIRATA AKIHITO ,  OHIRA TAKASHI

IPC: H01Q3/46 ,  G01S3/74 ,  H01Q19/32

Abstract: PROBLEM TO BE SOLVED: To provide an incoming direction estimation apparatus in which a miniaturization and a cost reduction are possible, reliability and durability are excellent, and no calibration by no skillful technology, etc. are required. SOLUTION: In the incoming direction estimation apparatus, a joint switching means 20 controls the reactance set of varactor diodes 11-16 by control voltage sets CLV1-CLV6 so that an antenna element 7 and antenna elements 1-6 which element coupling may rotate the ambients of the antenna element 7. An array antenna 10 receives a received signal when the antenna element 7 and the antenna elements 1-6 which perform element coupling rotation ambients of the antenna element 7. A frequency shift detection means 40 detects the frequency shift spectrum of the incoming wave based on the received signal received from the antenna element 7 through a booster 30. A direction estimation means 50 presumes an angle in which the frequency shift spectrum performs a zero cross to be the incoming direction of the incoming wave. COPYRIGHT: (C)2006,JPO&NCIPI