Patents by Inventor Tatsuya Fukunaga
Tatsuya Fukunaga 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).
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Patent number: 7561012Abstract: A pair of balanced terminals is connected to a pair of interdigital-coupled quarter-wave resonators in an electronic device. This electronic device has a first resonance mode that resonates at a first resonance frequency f1 higher than a resonance frequency f0 in each of the pair of quarter-wave resonators when establishing no interdigital-coupling, and a second resonance mode that resonates at a second resonance frequency f2 lower than the resonance frequency f0. The second resonance frequency f2 of a low frequency is set as an operating frequency. This provides an electronic device and a filter that facilitate miniaturization and enable a balanced signal to be transmitted with superior balance characteristics.Type: GrantFiled: July 27, 2006Date of Patent: July 14, 2009Assignee: TDK CorporationInventor: Tatsuya Fukunaga
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Patent number: 7541896Abstract: A stacked resonator and a filter are provided which are capable of achieving miniaturization and minimum loss, and also capable of transmitting a balanced signal with superior balance characteristics. There are provided a pair of quarter-wave resonators which are interdigital-coupled to each other. One quarter-wave resonator is constructed of a plurality of conductor lines which are stacked and arranged so as to establish a comb-line coupling. By the stacked arrangement so as to establish a comb-line coupling of the plurality of conductor lines, the conductor thickness of this quarter-wave resonator can be increased virtually thereby reducing the conductor loss. Similarly, the other quarter-wave resonator is constructed of a plurality of conductor lines stacked and arranged so as to establish a comb-line coupling, and hence the conductor thickness of this quarter-wave resonator can be increased virtually thereby reducing the conductor loss.Type: GrantFiled: March 1, 2007Date of Patent: June 2, 2009Assignee: TDK CorporationInventor: Tatsuya Fukunaga
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Patent number: 7525401Abstract: A stacked filter includes an array of resonant sections, the resonant sections adjacent each other being electromagnetically coupled, a first resonator electromagnetically coupled to the resonant section on one end of the array of the resonant sections, and a second resonator electromagnetically coupled to the resonant section on the other end thereof. Each of the resonant sections has a pair of interdigital coupled quarter-wave resonators, and a passing frequency as a filter is set to a value f2 lower than a frequency f0 determined by a physical length ?0/4 of the quarter-wave resonator. The first and second resonators have a physical length of ?2/4, where ?2 is a wavelength corresponding to the passing frequency f2. The stacked filter enables miniaturization and sufficient impedance matching with external circuits in a broad band, resulting in excellent filter characteristics in the broad band.Type: GrantFiled: September 24, 2007Date of Patent: April 28, 2009Assignee: TDK CorporationInventors: Toshiyuki Abe, Tatsuya Fukunaga
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Publication number: 20090085693Abstract: A filter being small and having a narrowband filter characteristic is achieved using interdigital-coupled resonators. A first resonator and a second resonator are configured using interdigital-coupled quarter-wavelength resonators respectively. In addition, the first resonator and the second resonator are disposed so as to extend along directions intersecting with each other at a predetermined angle ?. Thus, coupling between the resonators is reduced compared with, for example, a case that the first resonator and the second resonator are, as a whole, disposed in parallel to each other. The angle ?, with which the first resonator and the second resonator are disposed respectively, is adjusted, thereby coupling between the resonators may be made into a desired state. Thus, a desired narrowband filter characteristic is obtained.Type: ApplicationFiled: September 24, 2008Publication date: April 2, 2009Applicant: TDK CORPORATIONInventor: Tatsuya Fukunaga
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Patent number: 7495533Abstract: The present invention provides a waveguide for the TM mode having a simpler configuration. The waveguide has: a pair of main ground electrodes (2a) and (2b) disposed so as to face each other in parallel with each other with a dielectric block (4) in between; and a pair of side walls (3a) and (3b), each constructed of a plurality of sub ground electrodes (11) provided between the pair of main ground electrodes (2a) and (2b), the sub ground electrodes (11) stacked in parallel with the main ground electrodes (2a) and (2b) with a interval along a direction orthogonal to the main ground electrodes (2a) and (2b). Electromagnetic waves in the TM mode may propagate in a region (5) surrounded by the pair of main ground electrodes (2a) and (2b) and the pair of side walls (3a) and (3b).Type: GrantFiled: January 25, 2005Date of Patent: February 24, 2009Assignee: TDK CorporationInventor: Tatsuya Fukunaga
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Patent number: 7495528Abstract: The present invention provides a triplexer circuit obtaining an impedance matching in each of frequency bands with a simple configuration and separating a signal excellently. Three filters are connected in parallel with each other and, for signals in a pass frequency band of one of the filters, the other two filters form a parallel resonant circuit. In this case, the total impedance of the whole parallel resonant circuit becomes infinite (?) and the other two filters can be made open to the pass frequency band of the one filter. With the simple configuration in which the three filters are connected in parallel with each other, an impedance matching is obtained in each of the frequency bands, and excellent signal separation can be performed.Type: GrantFiled: May 18, 2006Date of Patent: February 24, 2009Assignee: TDK CorporationInventor: Tatsuya Fukunaga
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Publication number: 20090021324Abstract: The present invention provides an RF module capable of converting electromagnetic waves in the TE mode to balanced electromagnetic waves in the TEM mode without adjustment and outputting the balanced electromagnetic waves while easily realizing miniaturization. The RF module includes: a waveguide (3) in which a half-wavelength TE mode resonator (2) is formed; an E plane coupling window (4) formed in a wall portion (3a) orthogonal to an H plane out of wall portions (3a) to (3e) constructing the TE mode resonator (2) in the waveguide (3); an output line (5a) provided at the edge on the side of the wall portion (3d) parallel with the H plane on the E plane coupling window (4), and magnetically coupled to electromagnetic waves in the TE mode resonator (2); and another output line (5b) provided at the edge on the side of the wall portion (3e) parallel with the H plane in the E plane coupling window (4), and magnetically coupled to the electromagnetic waves.Type: ApplicationFiled: September 15, 2008Publication date: January 22, 2009Applicant: TDK CORPORATIONInventors: Tatsuya Fukunaga, Masaaki Ikeda, Kiyoshi Hatanaka
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Patent number: 7439829Abstract: The present invention provides an RF module capable of converting electromagnetic waves in the TE mode to balanced electromagnetic waves in the TEM mode without adjustment and outputting the balanced electromagnetic waves while easily realizing miniaturization. The RF module includes: a waveguide (3) in which a half-wavelength TE mode resonator (2) is formed; an E plane coupling window (4) formed in a wall portion (3a) orthogonal to an H plane out of wall portions (3a) to (3e) constructing the TE mode resonator (2) in the waveguide (3); an output line (5a) provided at the edge on the side of the wall portion (3d) parallel with the H plane on the E plane coupling window (4), and magnetically coupled to electromagnetic waves in the TE mode resonator (2); and another output line (5b) provided at the edge on the side of the wall portion (3e) parallel with the H plane in the E plane coupling window (4), and magnetically coupled to the electromagnetic waves.Type: GrantFiled: March 31, 2004Date of Patent: October 21, 2008Assignee: TDK CorporationInventors: Tatsuya Fukunaga, Masaaki Ikeda, Kiyoshi Hatanaka
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Patent number: 7403085Abstract: The present invention provides an RF module capable of outputting balanced electromagnetic waves without requiring adjustment and easily realizing miniaturization. The RF module includes: a waveguide (3) having an area which is surrounded by a pair of ground electrodes (6) and (7) provided so as to face each other and through holes (8) for making electric conduction between the pair of ground electrodes (6) and (7) and in which electromagnetic waves in the TE mode can propagate and a one-wavelength resonator (11) is formed; and a pair of output lines (4a) and (4b) connected to portions corresponding to half-wavelength resonance regions (A) and (B) of the one-wavelength resonator (11) in the ground electrode (6).Type: GrantFiled: March 31, 2004Date of Patent: July 22, 2008Assignee: TDK CorporationInventors: Tatsuya Fukunaga, Masaaki Ikeda, Kiyoshi Hatanaka
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Publication number: 20080079517Abstract: A stacked filter includes an array of resonant sections, the resonant sections adjacent each other being electromagnetically coupled, a first resonator electromagnetically coupled to the resonant section on one end of the array of the resonant sections, and a second resonator electromagnetically coupled to the resonant section on the other end thereof. Each of the resonant sections has a pair of interdigital coupled quarter-wave resonators, and a passing frequency as a filter is set to a value f2 lower than a frequency f0 determined by a physical length ?0/4 of the quarter-wave resonator. The first and second resonators have a physical length of ?2/4, where ?2 is a wavelength corresponding to the passing frequency f2. The stacked filter enables miniaturization and sufficient impedance matching with external circuits in a broad band, resulting in excellent filter characteristics in the broad band.Type: ApplicationFiled: September 24, 2007Publication date: April 3, 2008Applicant: TDK CORPORATIONInventors: Toshiyuki Abe, Tatsuya Fukunaga
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Publication number: 20070205851Abstract: A stacked resonator and a filter are provided which are capable of achieving miniaturization and minimum loss, and also capable of transmitting a balanced signal with superior balance characteristics. There are provided a pair of quarter-wave resonators which are interdigital-coupled to each other. One quarter-wave resonator is constructed of a plurality of conductor lines which are stacked and arranged so as to establish a comb-line coupling. By the stacked arrangement so as to establish a comb-line coupling of the plurality of conductor lines, the conductor thickness of this quarter-wave resonator can be increased virtually thereby reducing the conductor loss. Similarly, the other quarter-wave resonator is constructed of a plurality of conductor lines stacked and arranged so as to establish a comb-line coupling, and hence the conductor thickness of this quarter-wave resonator can be increased virtually thereby reducing the conductor loss.Type: ApplicationFiled: March 1, 2007Publication date: September 6, 2007Applicant: TDK CORPORATIONInventor: Tatsuya Fukunaga
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Publication number: 20070171005Abstract: Provided are a stacked resonator capable of achieving miniaturization and minimum loss, and a stacked resonator capable of suppressing any unnecessary resonance mode due to interdigital-coupling. The stacked resonator includes a first conductor group having a plurality of conductor lines in a stacking arrangement, and a second conductor group having a plurality of other conductor lines in a stacking arrangement so as to be alternately provided opposing to the conductor lines in the first conductor group, thereby establishing an interdigital-coupling together with the first conductor group.Type: ApplicationFiled: January 23, 2007Publication date: July 26, 2007Applicant: TDK CORPORATIONInventor: Tatsuya Fukunaga
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Publication number: 20070159277Abstract: The present invention provides a waveguide for the TM mode having a simpler configuration. The waveguide has: a pair of main ground electrodes (2a) and (2b) disposed so as to face each other in parallel with each other with a dielectric block (4) in between; and a pair of side walls (3a) and (3b), each constructed of a plurality of sub ground electrodes (11) provided between the pair of main ground electrodes (2a) and (2b), the sub ground electrodes (11) stacked in parallel with the main ground electrodes (2a) and (2b) with a interval along a direction orthogonal to the main ground electrodes (2a) and (2b). Electromagnetic waves in the TM mode may propagate in a region (5) surrounded by the pair of main ground electrodes (2a) and (2b) and the pair of side walls (3a) and (3b).Type: ApplicationFiled: January 25, 2005Publication date: July 12, 2007Applicant: TDK CORPORATIONInventor: Tatsuya Fukunaga
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Patent number: 7227428Abstract: The present invention is directed to enable mode conversion between a TEM mode and another mode to be performed among a plurality of waveguides. An RF module comprises: a microstrip line as a first waveguide for propagating electromagnetic waves in a TEM mode; and a waveguide having a multilayer structure as a second waveguide connected to the first waveguide, for propagating electromagnetic waves in another mode different from the TEM mode. An end of the first waveguide is directly or indirectly connected so as to be conductive to one of ground electrodes of the second waveguide from the direction orthogonal to the stacking direction of the ground electrodes. Since magnetic fields are coupled so that the direction of the magnetic field of the first waveguide and that of the magnetic field of the second waveguide match with each other in the E plane, mode conversion between the TEM mode and another mode to be excellently performed between the waveguides.Type: GrantFiled: October 27, 2003Date of Patent: June 5, 2007Assignee: TDK CorporationInventor: Tatsuya Fukunaga
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Patent number: 7199996Abstract: A laminated capacitor includes a capacitor body and first, second, third and fourth external electrodes disposed on an external surface of the capacitor body. The capacitor body has first and second electrode patterns that are alternately laminated with dielectric layers between. The first electrode pattern provides a first internal electrode that is connected to both the first and second external electrodes. The second electrode pattern provides second and third internal electrodes. The second internal electrode is connected to both the third and fourth external electrodes. The third internal electrode is disposed in the same layer as the second internal electrode and connected to one of the third and fourth external electrodes.Type: GrantFiled: May 25, 2006Date of Patent: April 3, 2007Assignee: TDK CorporationInventors: Masaaki Togashi, Tatsuya Fukunaga
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Patent number: 7199680Abstract: The present invention is directed to enable mode conversion between a TEM mode and another mode to be performed among a plurality of waveguides. An RF module comprises: a TEM waveguide as a first waveguide for propagating electromagnetic waves in a TEM mode; and a waveguide having a multilayer structure as a second waveguide connected to the first waveguide, for propagating electromagnetic waves in another mode different from the TEM mode. An end of the first waveguide is directly conductively connected to one of ground electrodes of the second waveguide from the stacking direction side of the ground electrodes. Since magnetic fields are coupled so that the direction of the magnetic field of the first waveguide and that of the magnetic field of the second waveguide match with each other in the H plane, mode conversion between the TEM mode and another mode can be excellently performed between the waveguides.Type: GrantFiled: October 27, 2003Date of Patent: April 3, 2007Assignee: TDK CorporationInventor: Tatsuya Fukunaga
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Publication number: 20070024398Abstract: A pair of balanced terminals is connected to a pair of interdigital-coupled quarter-wave resonators in an electronic device. This electronic device has a first resonance mode that resonates at a first resonance frequency f1 higher than a resonance frequency f0 in each of the pair of quarter-wave resonators when establishing no interdigital-coupling, and a second resonance mode that resonates at a second resonance frequency f2 lower than the resonance frequency f0. The second resonance frequency f2 of a low frequency is set as an operating frequency. This provides an electronic device and a filter that facilitate miniaturization and enable a balanced signal to be transmitted with superior balance characteristics.Type: ApplicationFiled: July 27, 2006Publication date: February 1, 2007Applicant: TDK CorporationInventor: Tatsuya Fukunaga
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Publication number: 20060284704Abstract: The present invention provides an RF module capable of outputting balanced electromagnetic waves without requiring adjustment and easily realizing miniaturization. The RF module includes: a waveguide (3) having an area which is surrounded by a pair of ground electrodes (6) and (7) provided so as to face each other and through holes (8) for making electric conduction between the pair of ground electrodes (6) and (7) and in which electromagnetic waves in the TE mode can propagate and a one-wavelength resonator (11) is formed; and a pair of output lines (4a) and (4b) connected to portions corresponding to half-wavelength resonance regions (A) and (B) of the one-wavelength resonator (11) in the ground electrode (6).Type: ApplicationFiled: March 31, 2004Publication date: December 21, 2006Applicant: TDK CorporationInventors: Tatsuya Fukunaga, Masaaki Ikeda, Kiyoshi Hatanaka
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Publication number: 20060279903Abstract: A laminated capacitor includes a capacitor body and first, second, third and fourth external electrodes disposed on an external surface of the capacitor body. The capacitor body has first and second electrode patterns that are alternately laminated with dielectric layers between. The first electrode pattern provides a first internal electrode that is connected to both the first and second external electrodes. The second electrode pattern provides second and third internal electrodes. The second internal electrode is connected to both the third and fourth external electrodes. The third internal electrode is disposed in the same layer as the second internal electrode and connected to one of the third and fourth external electrodes.Type: ApplicationFiled: May 25, 2006Publication date: December 14, 2006Applicant: TDK CorporationInventors: Masaaki Togashi, Tatsuya Fukunaga
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Publication number: 20060268811Abstract: The present invention provides a triplexer circuit obtaining an impedance matching in each of frequency bands with a simple configuration and separating a signal excellently. Three filters are connected in parallel with each other and, for signals in a pass frequency band of one of the filters, the other two filters form a parallel resonant circuit. In this case, the total impedance of the whole parallel resonant circuit becomes infinite (?) and the other two filters can be made open to the pass frequency band of the one filter. With the simple configuration in which the three filters are connected in parallel with each other, an impedance matching is obtained in each of the frequency bands, and excellent signal separation can be performed.Type: ApplicationFiled: May 18, 2006Publication date: November 30, 2006Applicant: TDK CORPORATIONInventor: Tatsuya Fukunaga