Abstract: A surface acoustic wave filter has, on a piezoelectric substrate, surface acoustic wave resonators each composed of an interdigital transducer and reflectors disposed on both sides of the interdigital transducer. The surface acoustic wave resonators are arranged in series arms and in parallel arms to be connected in a ladder form. At least one of the surface acoustic wave resonators is replaced with an interdigital transducer that does not involve resonance in a propagation direction of a surface acoustic wave.

Abstract: A surface acoustic wave resonator includes a piezoelectric substrate, and a SAW resonator having an interdigital transducer. The interdigital transducer satisfies 0.15L≦W≦0.45L where W is the total of widths of all electrode fingers that form the interdigital transducer, and L is a length of the said interdigital transducer in a direction of SAW propagation.

Abstract: Providing a small-sized acceleration sensor including a vibrator formed of a piezoelectric single crystal, and a weight section connected to the vibrator and supported at a position different from the position of the center of gravity of an assembly of the vibrator and weight section. Two divided electrodes used for detecting an electrical signal are formed on the vibrator and connected to two wiring patterns of the weight section which also functions as a signal detecting substrate, with an anisotropic conductive adhesive. When an acceleration in one direction is applied, an angular moment exerted in the weight section is detected as sliding vibration by the vibrator, and an electrical signal corresponding to the acceleration is output from the electrodes through the wiring patterns.

Abstract: An acceleration sensor includes a piezoelectric single-plate having a weight part and a detection part. The piezoelectric single-plate is, for example, an X-cut plate of LiNbO3.

Abstract: The present invention relates to a surface acoustic wave filter which is characterized in that it includes a piezoelectric substrate, a plurality of surface acoustic wave propagation paths arranged in parallel on the piezoelectric substrate and a coupler for coupling the surface acoustic wave propagation paths, an input interdigital transducer and a first reflector are disposed on at least one of the surface acoustic wave propagation paths with intervention of the coupler, and an output interdigital transducer and a second reflector are disposed on at least one of the other surface acoustic wave propagation paths with intervention of the coupler. This construction can reduce the length of the surface acoustic wave filter in a surface acoustic wave propagation direction and can improve the shape factor of a frequency characteristic curve.

Abstract: A duplexer includes a multilayer package, SAW filters that have different band center frequencies and are provided in the multilayer package, and a phase matching line that matches phases of the SAW filters and are provided in the multilayer package. A ground pattern with respect to the phase matching line is provided on a mount surface of the multilayer package.

Abstract: A surface acoustic wave filter includes a piezoelectric substrate having formed thereon plural surface acoustic wave resonators electrically connected in a ladder form for exciting a surface acoustic wave, wherein each of the surface acoustic wave resonators is composed of an interdigital transducer and reflectors arranged closely on both sides of the transducer in a direction parallel to a propagation direction of the excited surface acoustic wave; the interdigital transducer of at least one of the surface acoustic wave resonators is composed of a prescribed number of pairs of comb form electrodes; and the surface acoustic wave excited by the pairs of comb form electrodes contains two kinds of surface acoustic waves having phases that are different from each other by 180°.

Abstract: A surface acoustic wave resonator including at least one interdigital transducer formed on a piezoelectric substrate, wherein the at least one interdigital transducer includes a predetermined number of interdigitated electrode fingers, at least two electrode fingers among the interdigitated electrode fingers are withdrawn, and the positions of the withdrawal electrode fingers are aperiodic.

Abstract: A surface acoustic wave filter including a piezoelectric substrate, an exciting electrode formed on the piezoelectric substrate and exciting a surface acoustic wave, and a receiving electrode receiving the surface acoustic wave. Both the exciting and receiving electrodes are provided with interdigital electrode fingers having a period p. One of the exciting and receiving electrodes is constructed of a plurality of interdigital electrode sub-units having substantially the same electrode surface areas occupied by interdigital electrode fingers. The interdigital electrode sub-units are disposed in a direction perpendicular to a propagation direction of the excited surface acoustic wave and have a positional relation such that the interdigital electrode sub-units are offset from each other by (n±¼)p, wherein n is an integer, in a direction parallel to the propagation direction of the surface acoustic wave.

Abstract: A duplexer device of this invention includes two surface acoustic wave filters having different band center frequencies and a phase matching circuit for matching phases of the two surface acoustic wave filters. The phase matching circuit is composed of one or more. line patterns, and at least one of the line patterns is formed as divided among a plurality of internal layers of a multi-layer package, and at least the line patterns formed on the internal layers adjacent to each other have pattern shapes different from each other. According to the invention, a duplexer device having a small size and stable filter characteristics can be provided.

Abstract: A surface acoustic wave resonator including at least one interdigital transducer formed on a piezoelectric substrate, wherein the at least one interdigital transducer includes a predetermined number of interdigitated electrode fingers, at least two electrode fingers among the interdigitated electrode fingers are withdrawn, and the positions of the withdrawal electrode fingers are aperiodic.

Abstract: This invention is a duplexer device comprising two surface acoustic wave filters having band center frequencies different from each other and a line pattern for matching phases of the two surface acoustic Wave filters, wherein provided are: a wire bonding pad layer having a plurality of pads including. pads. for connecting the line pattern with terminals on the surface acoustic wave filters and pads for connecting a common terminal connected to. an external antenna with the line pattern; and a first pad connecting one of the surface acoustic wave filters and a first end of the line pattern and a second pad connecting the common terminal and a second end of the line pattern being arranged at positions that are the most distant from each other inside the wire bonding pad layer.

Abstract: A surface acoustic wave resonator includes a piezoelectric substrate having formed thereon a interdigital transducer part comprising plural electrode fingers having a period pi that is substantially equal to a wavelength of a surface acoustic wave to be excited, and at least one reflector arranged in the vicinity of the interdigital transducer part to reflect the surface acoustic wave excited by the interdigital transducer part in a direction parallel to a propagation direction of the surface acoustic wave. The interdigital transducer part has three or more electrode fingers within the period pi, and the reflector has plural gratings having a period pr that is equal to a half of a wavelength of a surface acoustic wave propagating in the reflector.

Abstract: The surface acoustic wave device includes a piezoelectric substrate having formed on a surface thereof an interdigital transducer for exciting a surface acoustic wave, a cavity formed on a back surface of the piezoelectric substrate on a region corresponding to the region where the interdigital transducer is formed, and a low expansion material buried in the cavity.

Abstract: This invention is a duplexer device comprising two surface acoustic wave filters having band center frequencies different from each other and a line pattern for matching phases of the two surface acoustic wave filters, wherein provided are: a wire bonding pad layer having a plurality of pads including pads for connecting the line pattern with terminals on the surface acoustic wave filters and pads for connecting a common terminal connected to an external antenna with the line pattern; and a first pad connecting one of the surface acoustic wave filters and a first end of the line pattern and a second pad connecting the common terminal and a second end of the line pattern being arranged at positions that are the most distant from each other inside the wire bonding pad layer.

Abstract: A method of manufacturing a surface acoustic device having an electrode containing an Al and an other metal comprising; forming patterning a layer of an Al and other metal forming the electrode by reactive ion etching which is conducted by using an etching gas containing a mixed gas comprising Cl2 and He at a gas pressure of 0.1 Pa to 3 Pa.

Abstract: A surface acoustic wave filter has, on a piezoelectric substrate, surface acoustic wave resonators each composed of an interdigital transducer and reflectors disposed on both sides of the interdigital transducer. The surface acoustic wave resonators are arranged in series arms and in parallel arms to be connected in a ladder form. At least one of the surface acoustic wave resonators is replaced with an interdigital transducer that does not involve resonance in a propagation direction of a surface acoustic wave.

Abstract: A SAW filter includes a first SAW resonator having a pair of terminals and a predetermined resonance frequency (frp), the first SAW resonator being provided in a parallel arm of the SAW filter. A second SAW resonator has a pair of terminals and a predetermined resonance frequency (frs) approximately equal to a predetermined antiresonance frequency of the first SAW resonator (fap). The second SAW resonator is provided in a series arm of the SAW filter. An inductance element is connected in series to the first SAW resonator.

Abstract: This invention relates to a surface acoustic wave device and a production process thereof. An electrode is formed by alternately laminating a film of an aluminum alloy containing at least copper added thereto and a copper film on a piezoelectric substrate. While the particle size of the multi-layered electrode materials is kept small, the occurrence of voids in the film is prevented and life time of the surface acoustic wave device is elongated.

Abstract: This invention relates to a surface acoustic wave device and a production process thereof. An electrode is formed by alternately laminating a film of an aluminum alloy containing at least copper added thereto and a copper film on a piezoelectric substrate. While the particle size of the multi-layered electrode materials in kept small, the occurrence of voids in the film is prevented and life time of the surface acoustic wave device is elongated.