Patents by Inventor Kiyoshi Egawa

Kiyoshi Egawa has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20200313739
    Abstract: A radio communication apparatus is described that includes a reception antenna, a converter, a calculator, and a separator. The reception antenna receives a mixed signal including two or more backscatter signals respectively transmitted from two or more tag devices and the converter converts the mixed signal into complex data on a complex plane. The calculator calculates phase angles of carrier waves of the two or more backscatter signals to approximate the phase angles into a complex data sequence of a predetermined length, and generates a projector matrix formed of a combination of the phase angles of carrier waves of the two or more backscatter signals. The separator separates the two or more backscatter signals from the mixed signal based on an inverse matrix of the projector matrix and the complex data sequence.
    Type: Application
    Filed: December 27, 2019
    Publication date: October 1, 2020
    Inventors: Jin Mitsugi, Haruhisa Ichikawa, Yuusuke Kawakita, Kiyoshi Egawa
  • Patent number: 10205587
    Abstract: Provided is a wireless communication system which enables wireless communication in which crosstalk due to multiple access is canceled while using a large number of inexpensive wireless terminals. In order to generate an interference component, an analysis data sequence is generated by applying a Hilbert transform, by a Hilbert transform, to a subcarrier data sequence obtained by extracting a target subcarrier wave component from a finite length data sequence, while a carrier phase difference ? is estimated by using the regression analysis by a carrier wave phase estimation unit. After rotation calculation configured to return the analysis data sequence by the carrier phase difference ? is performed, conversion into an angle is performed. Further, a multiplication by a desired odd number of multiplication is performed, and then an inverse Hilbert transform is applied.
    Type: Grant
    Filed: April 24, 2017
    Date of Patent: February 12, 2019
    Assignee: KYOWA ELECTRONIC INSTRUMENTS CO., LTD.
    Inventors: Jin Mitsugi, Yuki Igarashi, Haruhisa Ichikawa, Yuusuke Kawakita, Kiyoshi Egawa
  • Publication number: 20180254883
    Abstract: Provided is a wireless communication system which enables wireless communication in which crosstalk due to multiple access is canceled while using a large number of inexpensive wireless terminals. In order to generate an interference component, an analysis data sequence is generated by applying a Hilbert transform, by a Hilbert transform, to a subcarrier data sequence obtained by extracting a target subcarrier wave component from a finite length data sequence, while a carrier phase difference ? is estimated by using the regression analysis by a carrier wave phase estimation unit. After rotation calculation configured to return the analysis data sequence by the carrier phase difference ? is performed, conversion into an angle is performed. Further, a multiplication by a desired odd number of multiplication is performed, and then an inverse Hilbert transform is applied.
    Type: Application
    Filed: April 24, 2017
    Publication date: September 6, 2018
    Inventors: Jin MITSUGI, Yuki IGARASHI, Haruhisa ICHIKAWA, Yuusuke KAWAKITA, Kiyoshi EGAWA
  • Patent number: 7843394
    Abstract: A multi-band antenna can be realized by using a common antenna element with a simple configuration.
    Type: Grant
    Filed: December 5, 2005
    Date of Patent: November 30, 2010
    Assignee: Panasonic Corporation
    Inventors: Kiyoshi Egawa, Yoshio Koyanagi, Hiroshi Haruki
  • Patent number: 7821463
    Abstract: There is provided a mobile telephone assuring a high reception sensitivity over a wide band without deteriorating the design of the mobile telephone. In the mobile telephone, a helical antenna (4) operating as an antenna for television reception is formed by winding a conductive element along the external surface of the case several times at the upper end of the upper case (1). The helical antenna (4) is impedance-matched by a matching circuit (5) in a range of the order from 470 MHz to 700 MHz which is the television broadcast frequency. The matching circuit (5) is connected to a broadcast reception circuit (6). The broadcast reception circuit (6) operates as a reception circuit for receiving the television broadcast wave.
    Type: Grant
    Filed: June 16, 2005
    Date of Patent: October 26, 2010
    Assignee: Panasonic Corporation
    Inventors: Tomoaki Nishikido, Yutaka Saito, Yukari Yamazaki, Yoshio Koyanagi, Kiyoshi Egawa
  • Publication number: 20090231208
    Abstract: A multi-band antenna can be realized by using a common antenna element with a simple configuration.
    Type: Application
    Filed: December 5, 2005
    Publication date: September 17, 2009
    Applicant: MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.
    Inventors: Kiyoshi Egawa, Yoshio Koyanagi, Hiroshi Haruki
  • Publication number: 20090221243
    Abstract: Herein disclosed is a portable wireless device comprising a first monopole antenna section 11 having a length substantially equal to ¾ of a wavelength of a first frequency band, an open sleeve section 12 having a length substantially equal to ¼ of a wavelength of the first frequency band, the open sleeve section 12 being arranged under the condition that the first monopole antenna section 11 and the open sleeve section 12 are parallel to each other, and perpendicular to a line extending through one end of the first monopole antenna section 11 and one end of the open sleeve section 12, a feeding section 13 for feeding a radio frequency signal to the first monopole antenna section 11 and the open sleeve section 12 at the same time, a grounded base plate 14 made of conductive material, and a wireless circuit 15 arranged on the grounded base plate 14. The portable wireless device is useful for an ultra wideband system, and able to reduce the influence from the operator.
    Type: Application
    Filed: February 21, 2006
    Publication date: September 3, 2009
    Applicant: MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.
    Inventors: Kiyoshi Egawa, Yoshio Koyanagi, Hiroshi Haruki
  • Patent number: 7453405
    Abstract: A portable wireless device realizing high-speed transmission in downlink communication in a used state that a foldable portable wireless device is held in a hand of the user and ensuring a high antenna radiation efficiency. In the portable wireless device, platy conductors (1, 3, 4) are arranged in the longitudinal direction on the back of a display section (35) of an upper case (5). The signal of a transmission circuit (25) is distributed by a power distributor (18). One signal is fed to a platy conductor (1) through a phase shifter (17) and the other is fed to the platy conductor (3) or the platy conductor (4) from a high-frequency switch (19) through a transmission/reception duplexer (20) or a transmission/reception duplexer (21). The high-frequency switch (19) selectively feeds power to either the platy conductor (3) or the platy conductor (4) according to the signal from a gravity sensor (26).
    Type: Grant
    Filed: May 24, 2005
    Date of Patent: November 18, 2008
    Assignee: Panasonic Corporation
    Inventors: Tomoaki Nishikido, Yutaka Saito, Yoshio Koyanagi, Kiyoshi Egawa
  • Patent number: 7436364
    Abstract: A mobile radio apparatus that achieves high radiation efficiency in various usage states of a foldable mobile radio apparatus without causing negative impact on communication, and that can realize a thin model. In this mobile radio apparatus that is foldable and that has a mechanism joining a first case and second case at a hinge part and allowing the mobile radio apparatus to open and close, flat conductor (104), flat conductor (106) and flat conductor (107) that are placed distant from flat conductor (104) are placed in the first case, gravity sensor (122) detects an inclination angle of the mobile radio apparatus to judge the usage state of the mobile radio apparatus, and control section (123) controls high frequency switch (112) according to the inclination angle and supplies power selectively to flat conductor (106) and flat conductor (107).
    Type: Grant
    Filed: October 6, 2004
    Date of Patent: October 14, 2008
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Tomoaki Nishikido, Yutaka Saito, Hiroshi Haruki, Yoshio Koyanagi, Kiyoshi Egawa
  • Publication number: 20080096604
    Abstract: A mobile telephone device capable of acquiring a high sensitivity over a wide band without being obstructed by the antenna when in use and while being held by the hand of a user. In this device, a variable tuning circuit (106) and a band switching circuit (107) are connected with a loop element (104) acting as a TV receiving on-board antenna. The variable tuning circuit (106) is controlled with a tuning voltage (110) generated in a TV receiving circuit (109). A channel control unit (111) sets the received channel of the TV receiving circuit (109) and controls the band switching circuit (107) with a band switching signal (112).
    Type: Application
    Filed: June 22, 2005
    Publication date: April 24, 2008
    Applicant: MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.
    Inventors: Yukari Yamazaki, Yutaka Saito, Yoshio Koyanagi, Kiyoshi Egawa, Hiroyuki Sasaki
  • Publication number: 20080039043
    Abstract: There is disclosed a mobile telephone device capable of getting a high reception sensitivity whatever the use state is. In this device, a loop element (104) is arranged in the vicinity of a hinge unit (103) of an upper case (101). The loop element (104) is connected via a matching circuit (105) to a broadcast reception circuit (106). The device is configured so that a helical element (111) is selected in an earphone connector (109) when an earphone cable (108) is removed. A reception signal of the antenna selected by the earphone connector (109) is inputted to a broadcast reception circuit (110). Demodulation signal selection circuit (113) operates to select a demodulation signal having a higher signal quality outputted from the broadcast reception circuit (106) or the broadcast reception circuit (110).
    Type: Application
    Filed: June 22, 2005
    Publication date: February 14, 2008
    Applicant: Matsushita Electric Industrial Co., Ltd.
    Inventors: Yukari Yamazaki, Yutaka Saito, Yoshio Koyanagi, Kiyoshi Egawa, Hiroyuki Sasaki
  • Publication number: 20070247374
    Abstract: There is provided a mobile telephone assuring a high reception sensitivity over a wide band without deteriorating the design of the mobile telephone. In the mobile telephone, a helical antenna (4) operating as an antenna for television reception is formed by winding a conductive element along the external surface of the case several times at the upper end of the upper case (1). The helical antenna (4) is impedance-matched by a matching circuit (5) in a range of the order from 470 MHz to 700 MHz which is the television broadcast frequency. The matching circuit (5) is connected to a broadcast reception circuit (6). The broadcast reception circuit (6) operates as a reception circuit for receiving the television broadcast wave.
    Type: Application
    Filed: June 16, 2005
    Publication date: October 25, 2007
    Applicant: Matsushita Electric Industrial Co., Ltd.
    Inventors: Tomoaki Nishikido, Yutaka Saito, Yukari Yamazaki, Yoshio Koyanagi, Kiyoshi Egawa
  • Publication number: 20070225052
    Abstract: A portable telephone with broadcast receiver realizing high sensitivity performance by interlocking with the screen display state both at the time of broadcast receiving and portable telephone communication, thereby attaining suitable antenna polarization characteristics. An antenna element (1) is mounted on a display section case (3) in such a manner that its helical axis direction is aligned with the longitudinal direction of a liquid crystal display section (2). The display section case (3) is connected to an upper case (5) rotatably through a rotary shaft (4). The upper case (5) is coupled to a lower case (7) to be opened/closed freely through a hinge part (6). Main polarization direction of the antenna element (1) is varied depending on the rotational state of the liquid crystal display section (2) where its screen becomes long laterally or longitudinally, thus ensuring antenna polarization characteristics suitable for both at the time of broadcast reception and portable telephone communication.
    Type: Application
    Filed: March 16, 2005
    Publication date: September 27, 2007
    Applicant: MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.
    Inventors: Yukari Yamazaki, Yutaka Saito, Yoshio Koyanagi, Kiyoshi Egawa, Hiroyuki Sasaki
  • Publication number: 20070216584
    Abstract: A portable wireless device realizing high-speed transmission in downlink communication in a used state that a foldable portable wireless device is held in a hand of the user and ensuring a high antenna radiation efficiency. In the portable wireless device, platy conductors (1, 3, 4) are arranged in the longitudinal direction on the back of a display section (35) of an upper case (5). The signal of a transmission circuit (25) is distributed by a power distributor (18). One signal is fed to a platy conductor (1) through a phase shifter (17) and the other is fed to the platy conductor (3) or the platy conductor (4) from a high-frequency switch (19) through a transmission/reception duplexer (20) or a transmission/reception duplexer (21). The high-frequency switch (19) selectively feeds power to either the platy conductor (3) or the platy conductor (4) according to the signal from a gravity sensor (26).
    Type: Application
    Filed: May 24, 2005
    Publication date: September 20, 2007
    Inventors: Tomoaki Nishikido, Yutaka Saito, Yoshio Koyanagi, Kiyoshi Egawa
  • Publication number: 20070210970
    Abstract: An object of the invention is to provide a portable radio apparatus capable of reducing a local SAR occurring when it is set close to a human head by suppressing concentration of the current flowing through an antenna element and a ground board. A portable radio apparatus according to the invention includes a first case 8; a second case 9; a plate-shaped antenna element 1 provided in the first case 8; a conductor ground board 2 provided in the second case 9 and having a ground potential; at least two feed points 3 spaced from each other, for energizing the antenna element 1; a radio circuit 5 provided on the conductor ground board 2; a power distributor 6 for outputting so as to distribute a high-frequency power input from the radio circuit 5; and a phase compensating unit 7 for compensating phases of high-frequency powers input from the power distributor in in-phase to output the compensated high-frequency powers to the at least two feed points respectively.
    Type: Application
    Filed: April 14, 2005
    Publication date: September 13, 2007
    Applicant: MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.
    Inventors: Kiyoshi Egawa, Yoshio Koyanagi
  • Publication number: 20070080872
    Abstract: A mobile radio apparatus that achieves high radiation efficiency in various usage states of a foldable mobile radio apparatus without causing negative impact on communication, and that can realize a thin model. In this mobile radio apparatus that is foldable and that has a mechanism joining a first case and second case at a hinge part and allowing the mobile radio apparatus to open and close, flat conductor (104), flat conductor (106) and flat conductor (107) that are placed distant from flat conductor (104) are placed in the first case, gravity sensor (122) detects an inclination angle of the mobile radio apparatus to judge the usage state of the mobile radio apparatus, and control section (123) controls high frequency switch (112) according to the inclination angle and supplies power selectively to flat conductor (106) and flat conductor (107).
    Type: Application
    Filed: October 6, 2004
    Publication date: April 12, 2007
    Applicant: MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.
    Inventors: Tomoaki Nishikido, Yutaka Saito, Hiroshi Haruki, Yoshio Koyanagi, Kiyoshi Egawa
  • Patent number: 7002521
    Abstract: Feed point (101) performs unbalanced feeding to an antenna element (102). A parasitic element (104) is provided near the antenna element (102) and a ground plane (103), approximately parallel to the width direction of the ground plane (103). Moreover, the parasitic element (104) is configured in a length to operate as a director when provided on the side of the body with respect to the ground plane (103) during talk time and in a length to operate as a reflector when provided on the opposite side from the body with respect to the ground plane (103). By this means, it is possible to improve gain and reduce the specific absorption rate (SAR) during talk time.
    Type: Grant
    Filed: February 27, 2003
    Date of Patent: February 21, 2006
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Kiyoshi Egawa, Hideo Ito
  • Patent number: 6987485
    Abstract: A high gain built-in antenna for a radio communication terminal with less influence from the human body. This built-in antenna for a radio communication terminal includes bar-shaped second passive element 392 facing antenna elements making up dipole antenna 321. The distance between this second passive element 392 and the antenna elements making up dipole antenna 321 is appropriately set in such a way as to widen the band of the input impedance characteristic by changing mutual impedance between second passive element 392 and the antenna elements making up dipole antenna 321.
    Type: Grant
    Filed: August 30, 2001
    Date of Patent: January 17, 2006
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Hideo Ito, Kiyoshi Egawa
  • Patent number: 6924769
    Abstract: The unbalanced feeding antenna element 201 is fed power from one end and placed on the upper surface of the circuit substrate 103. The passive element 202 has open both ends, is set to a length corresponding to a predetermined frequency, placed in substantially parallel to the unbalanced feeding element 201 placed on the circuit substrate 103 at a distance of approximately 1/10 or less of a wavelength at a frequency used for transmission/reception. This suppresses the antenna current flowing into the circuit substrate 103 to a minimum level and makes radiation from the passive element 202 dominant compared to radiation from the circuit substrate 103. This makes it possible to suppress a reduction in the antenna gain caused by the human body when the user uses the communication terminal apparatus.
    Type: Grant
    Filed: December 27, 2002
    Date of Patent: August 2, 2005
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Hideo Ito, Kiyoshi Egawa
  • Publication number: 20040130492
    Abstract: Feed point (101) performs unbalanced feeding to an antenna element (102). A parasitic element (104) is provided near the antenna element (102) and a ground plane (103), approximately parallel to the width direction of the ground plane (103). Moreover, the parasitic element (104) is configured in a length to operate as a director when provided on the side of the body with respect to the ground plane (103) during talk time and in a length to operate as a reflector when provided on the opposite side from the body with respect to the ground plane (103). By this means, it is possible to improve gain and reduce the specific absorption rate (SAR) during talk time.
    Type: Application
    Filed: October 24, 2003
    Publication date: July 8, 2004
    Inventors: Kiyoshi Egawa, Hideo Ito