Patent application number | Description | Published |
20080296999 | ACOUSTIC WAVE DEVICE AND METHOD FOR FABRICATING THE SAME - A surface acoustic wave device includes a piezoelectric substrate, at least one interdigital transducer (IDT) electrode provided on the piezoelectric substrate, and an insulator layer to improve a temperature characteristic arranged so as to cover the IDT electrode. When a surface of the insulator layer is classified into a first surface region under which the IDT electrode is positioned and a second surface region under which no IDT electrode is positioned, the surface of the insulator layer in at least one portion of the second surface region is higher than the surface of the insulator layer from the piezoelectric substrate in at least one portion of the first surface region by at least about 0.001λ, where the wavelength of an acoustic wave is λ. | 12-04-2008 |
20080303379 | SURFACE ACOUSTIC WAVE DEVICE - A surface acoustic wave device includes a LiNbO | 12-11-2008 |
20080309192 | ACOUSTIC WAVE RESONATOR - In an acoustic wave resonator, an IDT electrode is provided on a piezoelectric substrate. The IDT electrode is apodization-weighted such that a plurality of maximum values of cross widths are provided in acoustic wave propagation directions. Alternatively, in apodization weighting, weighting is applied such that at least one of a pair of envelopes located at outer side portions of the IDT electrode in directions substantially perpendicular to acoustic wave propagation directions includes a plurality of angled envelope portions angled from a central portion of the IDT electrode toward an outer side portion of the IDT electrode in a direction substantially perpendicular to the acoustic wave propagation directions. | 12-18-2008 |
20090009028 | SURFACE ACOUSTIC WAVE DEVICE - A surface acoustic wave device utilizing a Rayleigh wave includes a LiNbO | 01-08-2009 |
20090021107 | SURFACE ACOUSTIC WAVE DEVICE - A surface acoustic wave device utilizing a Rayleigh wave includes a LiNbO | 01-22-2009 |
20090072659 | SURFACE ACOUSTIC WAVE DEVICE - A surface acoustic wave device has a duty that is greater than about 0.5, attenuation outside the pass band is increased, and an undesirable spurious response is effectively suppressed. The surface acoustic wave device includes an LiNbO | 03-19-2009 |
20090085429 | SURFACE ACOUSTIC WAVE DEVICE - A surface acoustic wave device has high power withstanding performance and is able to effectively suppress an undesirable spurious response. The surface acoustic wave device includes an LiNbO | 04-02-2009 |
20090295507 | ACOUSTIC WAVE ELEMENT - An acoustic wave element includes an IDT electrode in contact with a piezoelectric material and including a plurality of electrode fingers, which include first and second electrode fingers that adjoin each other in an acoustic wave propagation direction and that connect to different potentials and a first dummy electrode finger facing the first electrode finger via a gap located on an outer side in an electrode finger length direction of the first electrode finger. At an area near the gap, first protrusions are provided in at least one of the first electrode finger and the first dummy electrode finger, the first protrusion protruding in the acoustic wave propagation direction from at least one of side edges of the at least one of the first electrode finger and the first dummy electrode finger. The acoustic wave element has greatly improved resonance characteristics of a resonance frequency and prevents short-circuit failure between electrode fingers and degradation in insulation properties. | 12-03-2009 |
20100072856 | SURFACE ACOUSTIC WAVE DEVICE - A surface acoustic wave device includes a LiTaO | 03-25-2010 |
20100146754 | ACOUSTIC WAVE DEVICE AND METHOD FOR FABRICATING THE SAME - A surface acoustic wave device includes a piezoelectric substrate, at least one interdigital transducer (IDT) electrode provided on the piezoelectric substrate, and an insulator layer to improve a temperature characteristic arranged so as to cover the IDT electrode. When a surface of the insulator layer is classified into a first surface region under which the IDT electrode is positioned and a second surface region under which no IDT electrode is positioned, the surface of the insulator layer in at least one portion of the second surface region is higher than the surface of the insulator layer from the piezoelectric substrate in at least one portion of the first surface region by at least about 0.001λ, where the wavelength of an acoustic wave is λ. | 06-17-2010 |
20100219911 | ACOUSTIC WAVE DEVICE AND METHOD FOR FABRICATING THE SAME - A surface acoustic wave device includes a piezoelectric substrate, at least one interdigital transducer (IDT) electrode provided on the piezoelectric substrate, and an insulator layer to improve a temperature characteristic arranged so as to cover the IDT electrode. When a surface of the insulator layer is classified into a first surface region under which the IDT electrode is positioned and a second surface region under which no IDT electrode is positioned, the surface of the insulator layer in at least one portion of the second surface region is higher than the surface of the insulator layer from the piezoelectric substrate in at least one portion of the first surface region by at least about 0.001λ, where the wavelength of an acoustic wave is λ. | 09-02-2010 |
20110037344 | BOUNDARY ACOUSTIC WAVE DEVICE - A boundary acoustic wave device includes a piezoelectric substrate made of single-crystalline LiTaO | 02-17-2011 |
20140117810 | BOUNDARY ACOUSTIC WAVE DEVICE - A boundary acoustic wave device includes an LiTaO | 05-01-2014 |