| Patent application number | Description | Published |
|---|
| 20080266023 | SURFACE ACOUSTIC WAVE DEVICE AND BOUNDARY ACOUSTIC WAVE DEVICE - A piezoelectric substrate is joined to a cover with a support layer disposed therebetween and with a space maintained therebetween. A transmission surface acoustic wave filter and a reception surface acoustic wave filter are disposed on a major surface of the piezoelectric substrate adjacent to the cover and inside the support layer. External electrodes are provided on the side of the cover opposite to the side facing the piezoelectric substrate. The external electrodes include an antenna terminal electrically connected to the transmission surface acoustic wave filter and the reception surface acoustic wave filter, a transmission input terminal electrically connected to the transmission surface acoustic wave filter, and a reception output terminal electrically connected to the reception surface acoustic wave filter. A portion of an interconnection line that electrically connects the reception surface acoustic wave filter to the antenna terminal is disposed on the cover. | 10-30-2008 |
| 20090322444 | RESONATOR DEVICE, FILTER INCLUDING THE SAME, AND DUPLEXER - A resonator device includes a plurality of resonators which are connected in series. An inductor and a capacitor are connected in parallel with at least one of the plurality of resonators. At least another one of the plurality of resonators has no inductor or capacitor connected in parallel therewith. Therefore, a sufficiently large attenuation outside the passband can be attained when the resonator device is used in a filter. Furthermore, the resonator device can be reduced in size. | 12-31-2009 |
| 20100109802 | BRANCHING FILTER - A branching filter includes an antenna terminal, a transmission signal terminal, a reception signal terminal, a transmission filter element, and a reception filter element. At least one of the transmission filter element and the reception filter element includes a longitudinally coupled resonator filter element having first and second IDT electrodes arranged along a direction of propagation of an elastic wave. The first IDT electrode includes a first end connected to the antenna terminal. The second IDT electrode includes a first end connected to one of the transmission signal terminal and the reception signal terminal. The longitudinally coupled resonator filter element further includes an inductor connected in series between a second end of the first IDT electrode and a ground potential. | 05-06-2010 |
| 20100117483 | ELASTIC WAVE DEVICE AND METHOD OF PRODUCING THE SAME - An elastic wave device has a structure that prevents cracks from being formed in a piezoelectric substrate in flip-chip bonding using a bump, that minimizes the contact resistance in a contact portion where wiring patterns are electrically connected to each other, and that improves the insertion loss. In the elastic wave device, first and second multilayer electrically conductive films are provided on a piezoelectric substrate, the first multilayer electrically conductive film defines an IDT electrode and a first wiring pattern, the second multilayer electrically conductive film defines an electrode pad to which a bump is connected and a second wiring pattern, at least one contact portion where the second wiring pattern is overlapped on the first wiring pattern so as to be electrically connected to each other is provided, a top electrically conductive film of the first multilayer electrically conductive film is a Ti film, and a bottom electrically conductive film of the second multilayer electrically conductive film is an Al-based electrically conductive film including Al or an alloy mainly containing an Al. | 05-13-2010 |
| 20100176900 | SURFACE ACOUSTIC WAVE RESONATOR AND LADDER-TYPE FILTER - A surface acoustic wave resonator is constructed such that cross widths of an IDT electrode are weighted so that the cross widths are reduced as they move outward in the surface acoustic wave propagation direction, an inner edge of a first bus bar includes inclined portions that are inclined so that the inner edge is spaced a predetermined distance away from an envelope portion adjacent to the first bus bar, an inner edge of a second bus bar includes inclined portions that are inclined so that the inner edge is spaced a predetermined distance away from an envelope portion adjacent to the second bus bar, and the sum N of the numbers of electrode fingers and dummy electrodes that are crossed by a straight line extending from the tip of at least one of the electrode fingers in the surface acoustic wave propagation direction is at least N. | 07-15-2010 |
