Patents by Inventor Hajime Shimamura
Hajime Shimamura 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: 7893794Abstract: A branching filter package has a SAW filter chip housing area which houses a piezo electric base, on which a transmitting SAW filter and a receiving SAW filter having a different frequency passing band with each other, are formed, and an impedance matching circuit and a branching circuit for the transmitting SAW filter and the receiving SAW filter.Type: GrantFiled: October 30, 2007Date of Patent: February 22, 2011Assignee: Oki Semiconductor Co., Ltd.Inventors: Wataru Ohashi, Hajime Shimamura, Tomokazu Komazaki, Yoshiaki Fujita
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Patent number: 7859362Abstract: A branching filter package has a SAW filter chip housing area which houses a piezo electric base, on which a transmitting SAW filter and a receiving SAW filter having a different frequency passing band with each other, are formed, and an impedance matching circuit and a branching circuit for the transmitting SAW filter and the receiving SAW filter.Type: GrantFiled: October 30, 2007Date of Patent: December 28, 2010Assignee: Oki Semiconductor Co., Ltd.Inventors: Wataru Ohashi, Hajime Shimamura, Tomokazu Komazaki, Yoshiaki Fujita
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Patent number: 7679472Abstract: A branching filter package has a SAW filter chip housing area which houses a piezo electric base, on which a transmitting SAW filter and a receiving SAW filter having a different frequency passing band with each other, are formed, and an impedance matching circuit and a branching circuit for the transmitting SAW filter and the receiving SAW filter.Type: GrantFiled: October 30, 2007Date of Patent: March 16, 2010Assignee: Oki Semiconductor Co., Ltd.Inventors: Wataru Ohashi, Hajime Shimamura, Tomokazu Komazaki, Yoshiaki Fujita
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Publication number: 20100007434Abstract: A branching filter package has a SAW filter chip housing area which houses a piezo electric base, on which a transmitting SAW filter and a receiving SAW filter having a different frequency passing band with each other, are formed, and an impedance matching circuit and a branching circuit for the transmitting SAW filter and the receiving SAW filter.Type: ApplicationFiled: October 30, 2007Publication date: January 14, 2010Applicant: Oki Electronic Industry Co., Ltd.Inventors: Wataru Ohashi, Hajime Shimamura, Tomokazu Komazaki, Yoshiaki Fujita
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Patent number: 7602263Abstract: A branching filter package has a SAW filter chip housing area which houses a piezo electric base, on which a transmitting SAW filter and a receiving SAW filter having a different frequency passing band with each other, are formed, and an impedance matching circuit and a branching circuit for the transmitting SAW filter and the receiving SAW filter.Type: GrantFiled: October 30, 2007Date of Patent: October 13, 2009Assignee: Oki Semiconductor Co., Ltd.Inventors: Wataru Ohashi, Hajime Shimamura, Tomokazu Komazaki, Yoshiaki Fujita
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Patent number: 7479845Abstract: A branching filter package has a SAW filter chip housing area which houses a piezo electric base, on which a transmitting SAW filter and a receiving SAW filter having a different frequency passing band with each other, are formed, and an impedance matching circuit and a branching circuit for the transmitting SAW filter and the receiving SAW filter.Type: GrantFiled: January 11, 2005Date of Patent: January 20, 2009Assignee: Oki Electric Industry Co., Ltd.Inventors: Wataru Ohashi, Hajime Shimamura, Tomokazu Komazaki, Yoshiaki Fujita
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Publication number: 20080290964Abstract: A branching filter package has a SAW filter chip housing area which houses a piezo electric base, on which a transmitting SAW filter and a receiving SAW filter having a different frequency passing band with each other, are formed, and an impedance matching circuit and a branching circuit for the transmitting SAW filter and the receiving SAW filter.Type: ApplicationFiled: October 30, 2007Publication date: November 27, 2008Applicant: Oki Electronic Industry Co., Ltd.Inventors: Wataru Ohashi, Hajime Shimamura, Tomokazu Komazaki, Yoshiaki Fujita
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Publication number: 20080136556Abstract: A branching filter package has a SAW filter chip housing area which houses a piezo electric base, on which a transmitting SAW filter and a receiving SAW filter having a different frequency passing band with each other, are formed, and an impedance matching circuit and a branching circuit for the transmitting SAW filter and the receiving SAW filter.Type: ApplicationFiled: October 30, 2007Publication date: June 12, 2008Applicant: Oki Electronic Industry Co., Ltd.Inventors: Wataru Ohashi, Hajime Shimamura, Tomokazu Komazaki, Yoshiaki Fujita
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Publication number: 20080129413Abstract: A branching filter package has a SAW filter chip housing area which houses a piezo electric base, on which a transmitting SAW filter and a receiving SAW filter having a different frequency passing band with each other, are formed, and an impedance matching circuit and a branching circuit for the transmitting SAW filter and the receiving SAW filter.Type: ApplicationFiled: October 30, 2007Publication date: June 5, 2008Applicant: Oki Electronic Industry Co., Ltd.Inventors: Wataru Ohashi, Hajime Shimamura, Tomokazu Komazaki, Yoshiaki Fujita
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Patent number: 6937113Abstract: A branching filter package has a SAW filter chip housing area which houses a piezo electric base, on which a transmitting SAW filter and a receiving SAW filter having a different frequency passing band with each other, are formed, and an impedance matching circuit and a branching circuit for the transmitting SAW filter and the receiving SAW filter.Type: GrantFiled: April 3, 2002Date of Patent: August 30, 2005Assignee: Oki Electric Industry Co., Ltd.Inventors: Wataru Ohashi, Hajime Shimamura, Tomokazu Komazaki, Yoshiaki Fujita
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Publication number: 20050122187Abstract: A branching filter package has a SAW filter chip housing area which houses a piezo electric base, on which a transmitting SAW filter and a receiving SAW filter having a different frequency passing band with each other, are formed, and an impedance matching circuit and a branching circuit for the transmitting SAW filter and the receiving SAW filter.Type: ApplicationFiled: January 11, 2005Publication date: June 9, 2005Applicant: Oki Electric Industry Co., Ltd.Inventors: Wataru Ohashi, Hajime Shimamura, Tomokazu Komazaki, Yoshiaki Fujita
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Patent number: 6870440Abstract: A surface acoustic wave duplexer having an antenna terminal, a transmitting terminal and a receiving terminal. The surface acoustic wave duplexer includes a transmitting SAW filter coupled between the antenna terminal and the transmitting terminal, a receiving SAW filter coupled between the antenna terminal and the receiving terminal, a common piezoelectric substrate on which both of the transmitting SAW filter and the receiving SAW filter are formed, a package covering the common piezoelectric substrate. The antenna terminal, the transmitting terminal and the receiving terminal are formed on the package, and a frequency adjusting circuit is coupled between the antenna terminal and the transmitting SAW filter or the receiving SAW filter. The frequency adjusting circuit has a capacitance element.Type: GrantFiled: February 20, 2001Date of Patent: March 22, 2005Assignee: Oki Electric Industry Co., Ltd.Inventors: Tomokazu Komazaki, Yoshiaki Fujita, Hajime Shimamura
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Publication number: 20020171507Abstract: A branching filter package has a SAW filter chip housing area which houses a piezo electric base, on which a transmitting SAW filter and a receiving SAW filter having a different frequency passing band with each other, are formed, and an impedance matching circuit and a branching circuit for the transmitting SAW filter and the receiving SAW filter.Type: ApplicationFiled: April 3, 2002Publication date: November 21, 2002Inventors: Wataru Ohashi, Hajime Shimamura, Tomokazu Komazaki, Yoshiaki Fujita
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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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Publication number: 20010038322Abstract: A branching filter comprising a SAW resonator. The SAW resonator comprises a transmission SAW filter linked between an antenna terminal and a transmission terminal; a receiving SAW filter with different bandpass characteristics from the transmission SAW filter linked between the antenna terminal and the transmission terminal; a composite circuit that combines a frequency adjusting LC circuit linked between the antenna terminal and the transmission and receiving SAW filters with a branching filter circuit; and the branching filter circuit being structured to have a serial arm SAW resonator.Type: ApplicationFiled: May 8, 2001Publication date: November 8, 2001Applicant: Oki Electric Industry Co., Ltd.Inventors: Tomokazu Komazaki, Yoshiaki Fujita, Hajime Shimamura
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Patent number: 6222426Abstract: A branching filter comprising a SAW resonator. The branching filter comprises a transmission SAW filter linked between an antenna terminal and a transmission terminal; a receiving SAW filter with different bandpass characteristics from the transmission SAW filter linked between the antenna terminal and the transmission terminal; a composite circuit that combines a frequency adjusting LC circuit linked between the antenna terminal and the transmission and receiving SAW filters with a branching filter circuit; and the branching filter circuit being structured to have a serial arm SAW resonator.Type: GrantFiled: May 5, 1999Date of Patent: April 24, 2001Assignee: Oki Electric Industry, Co., Ltd.Inventors: Tomokazu Komazaki, Yoshiaki Fujita, Hajime Shimamura
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Patent number: 6208223Abstract: A receiving filter of a SAW separator that prevents temperature increase, and enables to improve electric power-resisting property and attains high performance. A series arms and parallel arms of a transmitting filter and receiving filter are equipped with ladder type filters comprising SAW resonators. In the receiving filter, the number of pairs of finger electrodes of a parallel arm resonator P1 arranged at the first stage viewed from input side is larger than the number of pairs of finger electrodes of parallel arm resonators P2, . . . at other stages. Or interdigitated width of finger electrodes of the parallel resonator at the first stage is made longer than interdigitated width of finger electrodes of each of parallel resonators at other stages.Type: GrantFiled: December 15, 1998Date of Patent: March 27, 2001Assignee: Oli Electric Industry, Co., Ltd.Inventors: Hajime Shimamura, Yoshiaki Fujita, Masaaki Umezawa, Tomokazu Komazaki
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Patent number: 5949305Abstract: In a ceramic package for encapsulating a SAW (surface acoustic wave) filter, a metal pad is formed on the bottom of a recess formed in the package. A SAW filter chip is mounted to the package such that propagation paths formed on the chip face the bottom of the recess with the intermediary of a gap. The gap promotes easy impedance adjustment.Type: GrantFiled: February 10, 1997Date of Patent: September 7, 1999Assignee: Oki Electric Industry Co., Ltd.Inventor: Hajime Shimamura
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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