Patent application number | Description | Published |
20090152982 | ELASTIC WAVE DEVICE, FILTER DEVICE, COMMUNICATION MODULE AND COMMUNICATION APPARATUS - An elastic wave device including a piezoelectric substrate, comb-like electrodes formed on the piezoelectric substrate, and a dielectric layer formed on the piezoelectric substrate. The dielectric layer formed on the piezoelectric substrate covers the comb-like electrodes and the thickness of the dielectric layer formed on the piezoelectric substrate is larger than the sum of the thickness of the comb-like electrodes and the thickness of the dielectric layer formed on the comb-like electrodes. | 06-18-2009 |
20090212659 | ELASTIC BOUNDARY WAVE DEVICE - An elastic boundary wave device includes a first medium with piezoelectricity, an electrode exciting an elastic wave and provided on the first medium, a second medium made of a different material from the first medium and provided on the first medium to cover the electrode, and a sound absorbing portion provided on the second medium. | 08-27-2009 |
20090267707 | ELASTIC WAVE DEVICE - An elastic wave device is described which includes a piezoelectric substrate, comb-shaped electrodes having teeth electrodes that are disposed so as to face each other on the piezoelectric substrate, a non-overlapping area in which the teeth electrodes of the comb-shaped electrodes do not overlap each other, and a overlapping area in which the teeth electrodes overlap each other and the velocity of sound is higher than that in the non-overlapping area. | 10-29-2009 |
20100109801 | ACOUSTIC WAVE FILTER, DUPLEXER, COMMUNICATION MODULE, AND COMMUNICATION APPARATUS - In an acoustic wave filter, a notch resonator is connected in series (or parallel) with a plurality of acoustic wave resonators connected in a ladder shape. The notch resonator has a main resonant frequency that is substantially equal to a sub-resonant frequency of the acoustic wave resonators. With this configuration, the occurrence of sub-resonant responses in filter characteristics can be suppressed, resulting in an improvement in communication characteristics. | 05-06-2010 |
20100141088 | ELASTIC BOUNDARY WAVE DEVICE - An elastic boundary wave device of the present invention includes a plurality of elastic boundary wave elements. The elastic boundary wave elements each include a piezoelectric material layer, an electrode disposed over the piezoelectric material layer, a first dielectric layer formed over the piezoelectric material layer so as to cover the electrode, and a second dielectric layer formed over the first dielectric layer. An acoustic velocity of the second dielectric layers is faster than an acoustic velocity of the first dielectric layers, and the acoustic velocity of the second dielectric layer of at least one elastic boundary wave element from among the plurality of elastic boundary wave elements is different from the acoustic velocity of the second dielectric layer of another of the elastic boundary wave elements. This enables improving the degree of suppression in use as a filter in the elastic boundary wave device. | 06-10-2010 |
20100148887 | ELASTIC WAVE DEVICE, DUPLEXER USING THE SAME, AND COMMUNICATION APPARATUS USING THE DUPLEXER - An elastic wave device includes resonators having a piezoelectric substrate, a resonation unit formed on the piezoelectric substrate, and reflectors formed on respective sides of the resonation unit on the piezoelectric substrate, and bumps formed on the piezoelectric substrate. The resonators are configured such that two or more split resonators are connected in parallel, and a bump is formed in a region sandwiched between reflectors of the split resonators. | 06-17-2010 |
20100188173 | ACOUSTIC WAVE DEVICE, TRANSMISSION APPARATUS, AND ACOUSTIC WAVE DEVICE MANUFACTURING METHOD - A first acoustic wave device includes a second acoustic wave device. The second acoustic wave device includes a substrate made of a piezoelectric material, a pair of interdigital electrodes formed on the substrate, each of the intergidital electrodes including a plurality of electrode fingers, and a adjustment medium. The adjustment medium includes at least a single layer and is formed on at least a part of the pair of the intergidital electrodes. The adjustment medium further includes a thick portion and a thin portion being null or thinner than the thick portion, an area of the thick portion opposed to a region being determined according to a predetermined characteristic value, the area including the intergital electrodes and a plurality of spaces between the electrode fingers adjacent each other. | 07-29-2010 |
20100244624 | ACOUSTIC WAVE DEVICE AND METHOD OF PRODUCING THE SAME - A method of producing an acoustic wave device includes: forming an interdigital electrode | 09-30-2010 |
20110204994 | BOUNDARY ACOUSTIC WAVE DEVICE AND COMMUNICATION EQUIPMENT - A boundary acoustic waves device includes a piezoelectric substrate ( | 08-25-2011 |