1
Nakazawa Michiyuki, Mochizuka Seisuke, Takahashi Masaki: Surface acoustic wave filter and surface acoustic wave resonator. TDK, April 17, 2008: JP2008-092017 (9 worldwide citation)

PROBLEM TO BE SOLVED: To obtain an SAW filter having a high Q, a low insertion loss, and high damage resistance to an electrode, and also to provide an SAW resonator.SOLUTION: In the SAW filter, a plurality of crossed electrode fingers arranged in the propagation direction of surface acoustic waves ...


2
Nakano Masahiro, Nakazawa Michiyuki, Sato Katsuo: Production method for a surface acoustic wave device. TDK, November 28, 2001: EP1158668-A1 (4 worldwide citation)

In a surface acoustic wave device of the invention, a metal oxide layer is formed on the surface of a piezoelectric substrate having electrodes comprising Al or an Al alloy in such a way as to cover at least the electrodes. The metal oxide layer is formed by oxidization of a metal layer thin enough ...


3
Takahashi Masaki, Osada Takashi, Nakazawa Michiyuki: Surface acoustic wave device. TDK, March 26, 2009: JP2009-065548 (1 worldwide citation)

PROBLEM TO BE SOLVED: To improve a damping property on a high-frequency side of a passband by reducing the size of a SAW device including a cascaded DMS filter.SOLUTION: The device includes a cascaded first stage filter and a cascaded second stage filter. Each of the filters includes a central IDT t ...


4
Mochizuka Seisuke, Takahashi Masaki, Nakazawa Michiyuki: Longitudinally coupled multi-mode resonator type surface acoustic wave filter. TDK, November 20, 2008: JP2008-283425 (1 worldwide citation)

PROBLEM TO BE SOLVED: To improve phase balance by miniaturizing a longitudinally coupled multi-mode resonator type SAW filter having a balance terminal.SOLUTION: The longitudinally coupled multi-mode filter includes a plurality of IDTs arrayed in a propagation direction of a surface acoustic wave, a ...


5
Kimura Noritoshi, Nakano Masahiro, Nakazawa Michiyuki, Sato Katsuo: Surface acoustic wave device and method of manufacturing the same. Tdk Corporation, Kimura Noritoshi, Nakano Masahiro, Nakazawa Michiyuki, Sato Katsuo, NAKAMURA Minoru, March 27, 1997: WO/1997/011526

An improved surface acoustic wave device in which electrodes composed of a film made of copper-added aluminum alloy are formed on a piezoelectric substrate. In the electrodes of the device, copper segregates near crystal grain boundaries, that is, the concentration of copper existing in the form of ...


6
Nakano Masahiro, Nakazawa Michiyuki, Sato Katsuo: Surface acoustic wave device and its production_method. Tdk Corporation, Nakano Masahiro, Nakazawa Michiyuki, Sato Katsuo, ISHII Yoichi, June 7, 2001: WO/2001/041304

In a surface acoustic wave device, a metal oxide layer is formed on a piezoelectric base on which an electrode of Al or an Al alloy is formed in such a way that the metal oxide layer covers at least the electrode. The metal oxide layer is formed by oxidizing a metal layer having such a thickness tha ...


7
Takahashi Masaki, Mochizuka Seisuke, Nakazawa Michiyuki: Longitudinally coupled resonator-type surface acoustic wave filter. TDK, zhangjing qiang, October 1, 2008: CN200810086904

Disclosed is a surface acoustic wave filter comprising two or more IDTs arranged in a propagation direction of the surface acoustic wave, wherein said two or more IDTs include at least one pair of IDTs arranged adjacent to each other in order to be acoustically coupled to each other, and have differ ...


8
Nakano Masahiro, Nakazawa Michiyuki, Sato Katsuo: Surface acoustic wave device and its production method. Tdk Corporation, feng pu, February 27, 2002: CN00803200

In a surface acoustic wave device of the invention, a metal oxide layer is formed on the surface of a piezoelectric substrate having electrodes comprising Al or an Al alloy in such a way as to cover at least the electrodes. The metal oxide layer is formed by oxidization of a metal layer thin enough ...


9
Nakazawa Michiyuki, Mochizuka Seisuke, Takahashi Masaki: Surface acoustic wave filter and surface acoustic wave resonator. TDK, xujing, April 2, 2008: CN200710161648

A SAW filter comprises an IDT disposed on a piezo-electric substrate, wherein the IDT includes comb-shaped electrodes having a plurality of interdigital electrodes arranged in a propagation direction of surface acoustic waves and bus bars for connecting these interdigital electrodes, arranged in opp ...


10
Takahashi Masaki, Mochizuka Seisuke, Nakazawa Michiyuki: Longitudinal coupling resonator type surface acoustic wave filter. TDK, October 16, 2008: JP2008-252678

PROBLEM TO BE SOLVED: To enhance an insertion loss and a reflection property of a longitudinal coupling resonator type surface acoustic wave (SAW) filter.SOLUTION: The SAW filter including two or more IDTs arrayed in the propagation direction of surface acoustic waves, has different electrode finger ...



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