Patents by Inventor Ai-ichiro Sasaki
Ai-ichiro Sasaki 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).
-
Patent number: 11158946Abstract: A dual loop antenna is provided which can clearly set a boundary of a communication area and create a well-balanced communication area. A dual loop antenna includes a first loop antenna and a second loop antenna. The first loop antenna and the second loop antenna are formed on an x-y plane. The center of the first loop antenna and the center of the second loop antenna are located at positions on an x-axis at the same distance from the point of origin being the center of the dual loop antenna. A phase difference between currents flowing on the first loop antenna and the second loop antenna, respectively, is a value in a range from 130 degrees to 230 degrees.Type: GrantFiled: July 3, 2018Date of Patent: October 26, 2021Assignees: Nippon Telegraph and Telephone Corporation, Toyota Jidosha Kabushiki KaishaInventors: Ai-ichiro Sasaki, Junichi Kodate, Jumpei Fuke, Hiroki Okada, Hiroko Okuyama
-
Publication number: 20200358193Abstract: A dual loop antenna is provided which can clearly set a boundary of a communication area and create a well-balanced communication area. A dual loop antenna includes a first loop antenna and a second loop antenna. The first loop antenna and the second loop antenna are formed on an x-y plane. The center of the first loop antenna and the center of the second loop antenna are located at positions on an x-axis at the same distance from the point of origin being the center of the dual loop antenna. A phase difference between currents flowing on the first loop antenna and the second loop antenna, respectively, is a value in a range from 130 degrees to 230 degrees.Type: ApplicationFiled: July 3, 2018Publication date: November 12, 2020Inventors: Ai-ichiro Sasaki, Junichi Kodate, Jumpei Fuke, Hiroki Okada, Hiroko Okuyama
-
Patent number: 10777909Abstract: Provided is a loop antenna array that can easily create a magnetic field distribution which enables the boundary of a communication area to be clearly set. 2n loop antennae are provided adjacently to one another, where n is a natural number. The directions of currents in adjacent ones of the loop antennae are opposite to each other. For example, in a loop antenna array, two loop antennae are disposed adjacently to each other on an insulator substrate. First feed points energize one loop antenna and second feed points energize the other loop antenna.Type: GrantFiled: August 4, 2016Date of Patent: September 15, 2020Assignee: Nippon Telegrah and Telephone CorporationInventors: Ai-ichiro Sasaki, Fumiharu Morisawa, Hiroki Morimura, Tsutomu Mizota, Osamu Kagami
-
Patent number: 10720706Abstract: Even when at least one of a capacitor (C1) connected to a main loop and a capacitor (C2) connected to an amplification loop cannot be set to an optimal value, a current value of a current (I2) flowing on the amplification loop can be made sufficiently large by setting the capacitors (C1, C2) based on any of an optimal C2 curved line, an optimal C1 curved line, and an optimal C1 straight line that pass through an optimal point (C1opt, C2opt) of the capacitors (C1, C2) and extend along a ridge of contour lines each joining the points where the magnitude of the current (I2) is equal on a diagram showing a relation of values of the capacitors (C1, C2) with the magnitude of the current (I2).Type: GrantFiled: June 8, 2018Date of Patent: July 21, 2020Assignee: Nippon Telegraph and Telephone CorporationInventors: Ai-ichiro Sasaki, Junichi Kodate
-
Patent number: 10700432Abstract: A loop antenna array capable of forming a clear boundary of a communication area is provided. The loop antenna array includes three loop antennas, in which a direction of a current flowing through the loop antenna arranged in the middle and a direction of a current flowing through each of the loop antennas arranged on both sides of the loop antenna arranged in the middle are opposite from each other, and the sum of magnetic moments of the three loop antennas is zero.Type: GrantFiled: September 1, 2016Date of Patent: June 30, 2020Assignee: Nippon Telegraph and Telephone CorporationInventors: Ai-ichiro Sasaki, Akihiko Hirata, Souichi Oka, Fumiharu Morisawa, Osamu Kagami
-
Publication number: 20200203832Abstract: Even when at least one of a capacitor (C1) connected to a main loop and a capacitor (C2) connected to an amplification loop cannot be set to an optimal value, a current value of a current (I2) flowing on the amplification loop can be made sufficiently large by setting the capacitors (C1, C2) based on any of an optimal C2 curved line, an optimal C1 curved line, and an optimal C1 straight line that pass through an optimal point (C1opt, C2opt) of the capacitors (C1, C2) and extend along a ridge of contour lines each joining the points where the magnitude of the current (I2) is equal on a diagram showing a relation of values of the capacitors (C1, C2) with the magnitude of the current (I2).Type: ApplicationFiled: June 8, 2018Publication date: June 25, 2020Inventors: Ai-ichiro Sasaki, Junichi Kodate
-
Patent number: 10680333Abstract: Provided is a loop antenna which can contribute to an increase of an area of a radio system using a magnetic field. The loop antenna includes a main loop 1 which is an open loop connected to a signal source 5 or a reception circuit; and an amplification loop 2 which is a closed loop having the same shape as the main loop 1. The main loop 1 and the amplification loop 2 are arranged on a same surface of a flat substrate formed of an insulator. A first capacitance is connected to the main loop 1, and a second capacitance is connected to the amplification loop.Type: GrantFiled: March 7, 2016Date of Patent: June 9, 2020Assignee: Nippon Telegraph and Telephone CorporationInventors: Ai-ichiro Sasaki, Tsutomu Mizota, Hiroki Morimura, Osamu Kagami
-
Patent number: 10498037Abstract: In an antenna circuit including an antenna 1 and an antenna 2 that is connected in series with the antenna 1 and includes inductance, a variable capacitor Cv and a variable resistor Rv connected in parallel with the antenna 2 are provided. This enables controlling of an actual amplitude ratio r and a phase difference ? between currents I1 and I2 flowing through the two antennas 1 and 2 into desired values. Flows of the currents I1 and I2 with the phase difference ? through the antennas 1 and 2 enable forming of a favorable communication area. In addition, setting of the actual amplitude ratio r between the currents I1 and I2 flowing through the antennas 1 and 2 to a value other than 1 enables forming of an asymmetric communication area.Type: GrantFiled: June 5, 2018Date of Patent: December 3, 2019Assignee: Nippon Telegraph and Telephone CorporationInventors: Ai-ichiro Sasaki, Junichi Kodate
-
Publication number: 20190363441Abstract: In an antenna circuit including an antenna 1 and an antenna 2 that is connected in series with the antenna 1 and includes inductance, a variable capacitor Cv and a variable resistor Rv connected in parallel with the antenna 2 are provided. This enables controlling of an actual amplitude ratio r and a phase difference ? between currents I1 and I2 flowing through the two antennas 1 and 2 into desired values. Flows of the currents I1 and I2 with the phase difference ? through the antennas 1 and 2 enable forming of a favorable communication area. In addition, setting of the actual amplitude ratio r between the currents I1 and I2 flowing through the antennas 1 and 2 to a value other than 1 enables forming of an asymmetric communication area.Type: ApplicationFiled: June 5, 2018Publication date: November 28, 2019Inventors: Ai-ichiro Sasaki, Junichi Kodate
-
Patent number: 10454172Abstract: A main loop is an open loop that is wound on a bar-shaped rod formed of a magnetic body or an insulation body and that has terminals T and T that couple a signal source or a receiving circuit to the main loop. The number of turns is 1 or more. An amplifying loop is wound on a part of the rod that is different from the part on which the main loop is wound. The main loop and the amplifying loop are thus spaced from each other. The amplifying loop is a closed loop including no terminals. The number of turns is 1 or more. The number of turns may be the same as or different from the number of turns of the main loop.Type: GrantFiled: August 26, 2016Date of Patent: October 22, 2019Assignee: Nippon Telegraph and Telephone CorporationInventors: Ai-ichiro Sasaki, Tsutomu Mizota, Hiroki Morimura, Osamu Kagami
-
Patent number: 10340598Abstract: A loop antenna array that can form a linear and clear communication area boundary is provided. The loop antenna array includes two loop antennas. Currents flow through the loop antennas in opposite directions from each other. In other words, viewing in a direction passing through each of the loop antennas, at a timing when a positive voltage is applied to a signal terminal of an alternating-current source, a clockwise current flows through one loop antenna while a counterclockwise current flows through the other loop antenna. Conversely, at a timing when a negative voltage is applied to the signal terminal of the alternating-current source, a counterclockwise current flows through one loop antenna while a clockwise current flows through the other loop antenna.Type: GrantFiled: August 23, 2016Date of Patent: July 2, 2019Assignee: Nippon Telegraph and Telephone CorporationInventors: Ai-ichiro Sasaki, Akihiko Hirata, Fumiharu Morisawa, Souichi Oka, Osamu Kagami
-
Publication number: 20190058253Abstract: A loop antenna array capable of forming a clear boundary of a communication area is provided. The loop antenna array includes three loop antennas, in which a direction of a current flowing through the loop antenna arranged in the middle and a direction of a current flowing through each of the loop antennas arranged on both sides of the loop antenna arranged in the middle are opposite from each other, and the sum of magnetic moments of the three loop antennas is zero.Type: ApplicationFiled: September 1, 2016Publication date: February 21, 2019Inventors: Ai-ichiro Sasaki, Akihiko Hirata, Souichi Oka, Fumiharu Morisawa, Osamu Kagami
-
Patent number: 10177823Abstract: Provided is an antenna control technique for forming the boundary of a communication area at a desired location. An antenna parameter control apparatus 2 calculates an antenna parameter in a case of feeding electric currents with an equal intensity in mutually reverse directions to two antennas 1A, 1B which generate a magnetic field. The antenna parameter control apparatus 2 includes an input parameter acquisition unit 21 that acquires input parameters for calculating the antenna parameter; and a parameter calculation unit 22 that calculates an inter-center distance d between the antennas 1A, 1B as the antenna parameter based on the input parameters.Type: GrantFiled: September 5, 2016Date of Patent: January 8, 2019Assignee: Nippon Telegraph and Telephone CorporationInventors: Ai-ichiro Sasaki, Akihiko Hirata, Fumiharu Morisawa, Souichi Oka, Osamu Kagami
-
Publication number: 20180342806Abstract: A main loop is an open loop that is wound on a bar-shaped rod formed of a magnetic body or an insulation body and that has terminals T and T that couple a signal source or a receiving circuit to the main loop. The number of turns is 1 or more. An amplifying loop is wound on a part of the rod that is different from the part on which the main loop is wound. The main loop and the amplifying loop are thus spaced from each other. The amplifying loop is a closed loop including no terminals. The number of turns is 1 or more. The number of turns may be the same as or different from the number of turns of the main loop.Type: ApplicationFiled: August 26, 2016Publication date: November 29, 2018Inventors: Ai-ichiro Sasaki, Tsutomu Mizota, Hiroki Morimura, Osamu Kagami
-
Publication number: 20180287257Abstract: A loop antenna array that can form a linear and clear communication area boundary is provided. The loop antenna array includes two loop antennas. Currents flow through the loop antennas in opposite directions from each other. In other words, viewing in a direction passing through each of the loop antennas, at a timing when a positive voltage is applied to a signal terminal of an alternating-current source, a clockwise current flows through one loop antenna while a counterclockwise current flows through the other loop antenna. Conversely, at a timing when a negative voltage is applied to the signal terminal of the alternating-current source, a counterclockwise current flows through one loop antenna while a clockwise current flows through the other loop antenna.Type: ApplicationFiled: August 23, 2016Publication date: October 4, 2018Inventors: Ai-ichiro Sasaki, Akihiko Hirata, Fumiharu Morisawa, Souichi Oka, Osamu Kagami
-
Publication number: 20180277953Abstract: Provided is a loop antenna which can contribute to an increase of an area of a radio system using a magnetic field. The loop antenna includes a main loop 1 which is an open loop connected to a signal source 5 or a reception circuit; and an amplification loop 2 which is a closed loop having the same shape as the main loop 1. The main loop 1 and the amplification loop 2 are arranged on a same surface of a flat substrate formed of an insulator. A first capacitance is connected to the main loop 1, and a second capacitance is connected to the amplification loop.Type: ApplicationFiled: March 7, 2016Publication date: September 27, 2018Inventors: Ai-ichiro Sasaki, Tsutomu Mizota, Hiroki Morimura, Osamu Kagami
-
Publication number: 20180205157Abstract: Provided is a loop antenna array that can easily create a magnetic field distribution which enables the boundary of a communication area to be clearly set. 2n loop antennae are provided adjacently to one another, where n is a natural number. The directions of currents in adjacent ones of the loop antennae are opposite to each other. For example, in a loop antenna array, two loop antennae are disposed adjacently to each other on an insulator substrate. First feed points energize one loop antenna and second feed points energize the other loop antenna.Type: ApplicationFiled: August 4, 2016Publication date: July 19, 2018Applicant: Nippon Telegraph and Telephone CorporationInventors: Ai-ichiro Sasaki, Fumiharu Morisawa, Hiroki Morimura, Tsutomu Mizota, Osamu Kagami
-
Publication number: 20180109296Abstract: Provided is an antenna control technique for forming the boundary of a communication area at a desired location. An antenna parameter control apparatus 2 calculates an antenna parameter in a case of feeding electric currents with an equal intensity in mutually reverse directions to two antennas 1A, 1B which generate a magnetic field. The antenna parameter control apparatus 2 includes an input parameter acquisition unit 21 that acquires input parameters for calculating the antenna parameter; and a parameter calculation unit 22 that calculates an inter-center distance d between the antennas 1A, 1B as the antenna parameter based on the input parameters.Type: ApplicationFiled: September 5, 2016Publication date: April 19, 2018Inventors: Ai-ichiro Sasaki, Akihiko Hirata, Fumiharu Morisawa, Souichi Oka, Osamu Kagami
-
Patent number: 7069062Abstract: A transceiver for inducing electric fields according to data to be transmitted in an electric field propagating medium, and carrying out at least data transmission by using induced electric fields, is formed by a transmission unit configured to modulate the data to be transmitted by generating alternating current signals having a prescribed frequency, and transmit modulated signals obtained by modulating the data to be transmitted, and a resonance causing unit configured to cause a series resonance with a parasitic capacitance appearing between a ground for the transmission unit and an Earth ground and a parasitic capacitance appearing between the electric field propagating medium and the Earth Ground.Type: GrantFiled: October 31, 2003Date of Patent: June 27, 2006Assignee: Nippon Telegraph & Telephone Corp.Inventors: Tadashi Minotani, Ai-ichiro Sasaki, Nobutaro Shibata, Mitsuru Shinagawa
-
Publication number: 20040092296Abstract: A transceiver for inducing electric fields according to data to be transmitted in an electric field propagating medium, and carrying out at least data transmission by using induced electric fields, is formed by a transmission unit configured to modulate the data to be transmitted by generating alternating current signals having a prescribed frequency, and transmit modulated signals obtained by modulating the data to be transmitted, and a resonance causing unit configured to cause a series resonance with a parasitic capacitance appearing between a ground for the transmission unit and an Earth ground and a parasitic capacitance appearing between the electric field propagating medium and the Earth Ground.Type: ApplicationFiled: October 31, 2003Publication date: May 13, 2004Inventors: Tadashi Minotani, Ai-Ichiro Sasaki, Nobutaro Shibata, Mitsuru Shinagawa