Patents by Inventor Hisanori Ehara
Hisanori Ehara 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: 8756777Abstract: A method of manufacturing a ladder filter including first and second resonators includes: forming a piezoelectric film on an entire surface of a substrate that has respective lower electrodes of the first and second resonator formed thereon, an conductive film on the piezoelectric film, and a second film on the conductive film; forming a pattern of the second film in a prescribed region in the second area; forming a first film on an entire surface of the substrate; etching the first film, forming a pattern of the first film, the second film and the conductive film in the second area, and forming a pattern of the first film and the conductive film in the first area, to form respective upper electrodes from the conductor film; and thereafter, etching the piezoelectric film to form respective patterns of the piezoelectric film in the first and second areas, respectively.Type: GrantFiled: December 28, 2009Date of Patent: June 24, 2014Assignee: Taiyo Yuden Co., Ltd.Inventors: Shinji Taniguchi, Tokihiro Nishihara, Tsuyoshi Yokoyama, Masafumi Iwaki, Go Endo, Yasuyuki Saitou, Hisanori Ehara, Masanori Ueda
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Publication number: 20100096358Abstract: A ladder filter includes a series resonator having a first film laminate in which an upper electrode and a lower electrode face each other across a piezoelectric film, and a first film provided on the first film laminate, and a parallel resonator having a second film laminate having a structure similar to that of the first film laminate, a second film provided on the second film laminate, and another first film identical to the first film.Type: ApplicationFiled: December 28, 2009Publication date: April 22, 2010Applicants: Fujitsu Media Devices Limited, Fujitsu LimitedInventors: Shinji TANIGUCHI, Tokihiro Nishihara, Tsuyoshi Yokoyama, Masafumi Iwaki, Go Endo, Yasuyuki Saitou, Hisanori Ehara, Masanori Ueda
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Patent number: 7545077Abstract: A filter includes multiple piezoelectric thin-film resonators each having a substrate, a lower electrode formed on the substrate, a piezoelectric film formed on the lower electrode, and an upper electrode provided on the piezoelectric film so that the upper electrode and the lower electrode face each other across the piezoelectric film. The multiple piezoelectric thin-film resonators include a first resonator in which at least a part of an outer curved portion of the piezoelectric film of the first resonator is located further out than an outer curved portion of a region in which the upper electrode and the lower electrode face each other across the piezoelectric film.Type: GrantFiled: May 30, 2007Date of Patent: June 9, 2009Assignees: Fujitsu Media Devices Limited, Fujitsu LimitedInventors: Shinji Taniguchi, Tsuyoshi Yokoyama, Motoaki Hara, Takeshi Sakashita, Jun Tsutsumi, Masafumi Iwaki, Tokihiro Nishihara, Masanori Ueda, Hisanori Ehara
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Patent number: 7420440Abstract: A surface acoustic wave filter includes an antenna terminal, a transmitting filter and a variable branching line both of which are coupled to the antenna terminal and a receiving filter coupled to the variable branching line. The transmitting filter has a first end series-arm SAW resonator, a second end series-arm SAW resonator, a middle series-arm SAW resonator coupled between the first and second end series-arm SAW resonators and parallel-arm SAW resonators. Each of the first and second end series-arm SAW resonator has a first resonance frequency. The middle series-arm SAW resonator has a second resonance frequency that is higher than the first resonance frequency.Type: GrantFiled: November 9, 2004Date of Patent: September 2, 2008Assignee: Oki Electric Industry Co., Ltd.Inventors: Kenichi Anasako, Yoshiaki Fujita, Hisanori Ehara, Tomokazu Komazaki
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Publication number: 20080129417Abstract: A ladder filter includes a series resonator having a first film laminate in which an upper electrode and a lower electrode face each other across a piezoelectric film, and a first film provided on the first film laminate, and a parallel resonator having a second film laminate having a structure similar to that of the first film laminate, a second film provided on the second film laminate, and another first film identical to the first film.Type: ApplicationFiled: October 16, 2007Publication date: June 5, 2008Inventors: Shinji Taniguchi, Tokihiro Nishihara, Tsuyoshi Yokoyama, Masafumi Iwaki, Go Endo, Yasuyuki Saitou, Hisanori Ehara, Masanori Ueda
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Publication number: 20070279154Abstract: A filter includes multiple piezoelectric thin-film resonators each having a substrate, a lower electrode formed on the substrate, a piezoelectric film formed on the lower electrode, and an upper electrode provided on the piezoelectric film so that the upper electrode and the lower electrode face each other across the piezoelectric film. The multiple piezoelectric thin-film resonators include a first resonator in which at least a part of an outer curved portion of the piezoelectric film of the first resonator is located further out than an outer curved portion of a region in which the upper electrode and the lower electrode face each other across the piezoelectric film.Type: ApplicationFiled: May 30, 2007Publication date: December 6, 2007Inventors: Shinji Taniguchi, Tsuyoshi Yokoyama, Motoaki Hara, Takeshi Sakashita, Jun Tsutsumi, Masafumi Iwaki, Tokihiro Nishihara, Masanori Ueda, Hisanori Ehara
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Patent number: 6911878Abstract: A surface acoustic wave filter includes an antenna terminal, a transmitting filter and a variable branching line both of which are coupled to the antenna terminal and a receiving filter coupled to the variable branching line. The transmitting filter has a first end series-arm SAW resonator, a second end series-arm SAW resonator, a middle series-arm SAW resonator coupled between the first and second end series-arm SAW resonators and parallel-arm SAW resonators. Each of the first and second end series-arm SAW resonator has a first resonance frequency. The middle series-arm SAW resonator has a second resonance frequency that is higher than the first resonance frequency.Type: GrantFiled: October 21, 2002Date of Patent: June 28, 2005Assignee: Oki Electric Industry Co., Ltd.Inventors: Kenichi Anasako, Yoshiaki Fujita, Hisanori Ehara, Tomokazu Komazaki
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Publication number: 20050134407Abstract: A surface acoustic wave filter includes an antenna terminal, a transmitting filter and a variable branching line both of which are coupled to the antenna terminal and a receiving filter coupled to the variable branching line. The transmitting filter has a first end series-arm SAW resonator, a second end series-arm SAW resonator, a middle series-arm SAW resonator coupled between the first and second end series-arm SAW resonators and parallel-arm SAW resonators. Each of the first and second end series-arm SAW resonator has a first resonance frequency. The middle series-arm SAW resonator has a second resonance frequency that is higher than the first resonance frequency.Type: ApplicationFiled: November 9, 2004Publication date: June 23, 2005Inventors: Kenichi Anasako, Yoshiaki Fujita, Hisanori Ehara, Tomokazu Komazaki
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Patent number: 6861925Abstract: A surface acoustic wave filter includes an antenna terminal, an antenna, a transmitting filter, a branching line and a receiving filter. The antenna is coupled to the antenna terminal. The transmitting filter is coupled to the antenna terminal. The transmitting filter receives an electrical power. The branching line is coupled to the antenna terminal. The branching line has a first length that is longer than ?/4 length so that the electrical power received by the transmitting filter when the antenna terminal is opened is smaller than when the antenna terminal is terminated, wherein ? is a wave length of a center frequency of transmitted and received bands of the surface acoustic wave filter. The receiving filter is coupled to the branching line.Type: GrantFiled: October 21, 2002Date of Patent: March 1, 2005Assignee: Oki Electric Industry Co., Ltd.Inventors: Wataru Ohashi, Hisanori Ehara, Tomokazu Komazaki
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Patent number: 6765456Abstract: A surface acoustic wave duplexer includes a piezoelectric substrate; a transmitting filter formed on the piezoelectric substrate; a receiving filter formed on the piezoelectric substrate; a transmitting (Tx) branching line formed on the piezoelectric substrate; and a receiving (Rx) branching line formed on the piezoelectric substrate.Type: GrantFiled: December 17, 2001Date of Patent: July 20, 2004Assignee: Oki Electric Industry Co., Ltd.Inventors: Hisanori Ehara, Kazushige Noguchi, Satoshi Terada, Tomokazu Komazaki
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Publication number: 20030117233Abstract: A surface acoustic wave filter includes an antenna terminal, a transmitting filter and a variable branching line both of which are coupled to the antenna terminal and a receiving filter coupled to the variable branching line. The transmitting filter has a first end series-arm SAW resonator, a second end series-arm SAW resonator, a middle series-arm SAW resonator coupled between the first and second end series-arm SAW resonators and parallel-arm SAW resonators. Each of the first and second end series-arm SAW resonator has a first resonance frequency. The middle series-arm SAW resonator has a second resonance frequency that is higher than the first resonance frequency.Type: ApplicationFiled: October 21, 2002Publication date: June 26, 2003Inventors: Kenichi Anasako, Yoshiaki Fujita, Hisanori Ehara, Tomokazu Komazaki
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Publication number: 20030112094Abstract: A surface acoustic wave duplexer includes a piezoelectric substrate; a transmitting filter formed on the piezoelectric substrate; a receiving filter formed on the piezoelectric substrate; a transmitting (Tx) branching line formed on the piezoelectric substrate; and a receiving (Rx) branching line formed on the piezoelectric substrate.Type: ApplicationFiled: December 17, 2001Publication date: June 19, 2003Inventors: Hisanori Ehara, Kazushige Noguchi, Satoshi Terada, Tomokazu Komazaki
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Publication number: 20030098756Abstract: A surface acoustic wave filter includes an antenna terminal, an antenna, a transmitting filter, a variable branching line and a receiving filter. The antenna is coupled to the antenna terminal. The transmitting filter is coupled to the antenna terminal for receiving an electrical power. The variable branching line is coupled to the antenna terminal. The variable branching line has a first length when the antenna terminal is opened and has a second length that is longer than the first length when the antenna terminal is terminated so that the electrical power received by the transmitting filter when the antenna terminal is opened is smaller than it when the antenna terminal is terminated. The receiving filter is coupled to the variable branching line.Type: ApplicationFiled: October 21, 2002Publication date: May 29, 2003Inventors: Wataru Ohashi, Hisanori Ehara, Tomokazu Komazaki
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Patent number: 6424239Abstract: In a differential surface acoustic wave resonator, when an unbalanced electric signal is inputted between an input terminal 301 and an output terminal connected to a ground potential, this electric signal is inputted to two-terminal-pair surface acoustic wave resonators 351 and 352. The electric signal inputted to the two-terminal-pair surface acoustic wave resonator 351 is converted into a surface acoustic wave, and thereafter it is again converted into an electric signal to be outputted to a two-terminal-pair surface acoustic wave resonator 353. The electric signal inputted to the two-terminal-pair surface acoustic wave resonator 353 is converted into a surface acoustic wave, and thereafter it is again converted into an electric signal to be outputted from an output terminal 302 of the differential surface acoustic wave filter as a balanced signal.Type: GrantFiled: May 26, 2000Date of Patent: July 23, 2002Assignee: Oki Electric Industry Co., Ltd.Inventors: Hisanori Ehara, Kazushige Noguchi, Yoshikazu Kihara
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Patent number: 6377140Abstract: A surface-acoustic-wave filter has a pair of series-arm surface-acoustic-wave resonators and a shunt-arm surface-acoustic-wave resonator coupled in a T configuration. An additional bridging surface-acoustic-wave resonator is coupled between the input and output terminals, in parallel with the series arm. The bridging surface-acoustic-wave resonator provides enhanced attenuation of spurious signals at multiples of the passband frequency.Type: GrantFiled: March 15, 2000Date of Patent: April 23, 2002Assignee: Oki Electric Industry Co., Ltd.Inventors: Hisanori Ehara, Hajime Shimamura, Yoshiaki Fujita, Tomokazu Komazaki
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Patent number: 5905418Abstract: A surface-acoustic-wave filter couples a two-port surface-acoustic-wave resonator filter circuit coupled in parallel or in series with a two-port impedance circuit. The two-port impedance circuit has an impedance that creates a pole of attenuation, by making the open-circuit impedance of the surface-acoustic-wave filter equal to the short-circuit impedance. High attenuation over a wide range of stopband frequencies is obtained in this way, combined with steep roll-off between the passband and stopband.Type: GrantFiled: December 18, 1997Date of Patent: May 18, 1999Assignee: Oki Electric Industry Co., Ltd.Inventors: Hisanori Ehara, Kazushige Noguchi, Hajime Shimamura, Yoshio Okada, Tomokazu Komazaki
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Patent number: RE37639Abstract: A surface-acoustic-wave filter couples a two-port surface-acoustic-wave resonator filter circuit coupled in parallel or in series with a two-port impedance circuit. The two-port impedance circuit has an impedance that creates a pole of attenuation, by making the open-circuit impedance of the surface-acoustic-wave filter equal to the short-circuit impedance. High attenuation over a wide range of stopband frequencies is obtained in this way, combined with steep roll-off between the passband and stopband.Type: GrantFiled: January 18, 2000Date of Patent: April 9, 2002Assignee: Oki Electric Industry Co., Ltd.Inventors: Hisanori Ehara, Kazushige Noguchi, Hajime Shimamura, Yoshio Okada, Tomokazu Komazaki