Abstract: To provide a surface elastic wave apparatus that suppresses occurrence of fine ripples within a pass band, improves insertion loss and enhances the degree of balance. First and second surface acoustic wave elements (14, 15) that are parallel-connected to a surface acoustic wave resonator (16) respectively have three or more odd-numbered IDTs (2-4, 5-7), each having a plurality of electrode fingers placed along a propagation direction of a surface acoustic wave that is propagated over a piezoelectric substrate (1), and reflectors (8, 20, 21, 10), each having a plurality of electrode fingers that are placed on the two ends of the IDT row, and among all the electrode fingers respectively possessed by the IDTs and reflectors, the polarities of the electrode fingers placed adjacent to a different IDT or reflector are arranged symmetrically centered on the IDT located in the center.

Abstract: To provide a communication apparatus and a SAW device wherein the steepness in the vicinity of the outside of the lower frequencies of a passband can be improved. On a piezoelectric board 100, a SAW element 11 is formed which has first to fifth IDT electrodes 1-5 and reflector electrodes 6,7 with first to fourth electrode-finger narrow-pitch portions N1-N4 being formed in the respective ones of adjoining portions of the respective first to fifth IDT electrodes 1-5. An unbalanced signal terminal 8 and balanced signal terminals 9,10 are connected to the SAW element 11.

Abstract: A surface acoustic wave device includes front stage and rear stage surface acoustic wave elements, a signal wiring connecting between the front stage and rear stage surface acoustic wave elements, a reference potential wiring connected with the rear stage surface acoustic wave element and a capacitor made of an insulator interposed between the signal wiring and the reference potential wiring. A surface acoustic wave device includes a front stage surface acoustic wave resonator, a rear stage surface acoustic wave element, a signal wiring connecting between the front stage surface acoustic wave resonator and the rear stage surface acoustic wave element, a reference potential wiring connected with the rear stage surface acoustic wave element and a capacitor made of an insulator interposed between the signal wiring and the reference potential wiring. A communication device includes the surface acoustic wave device described above, a receiver circuit or a transmitter circuit.

Abstract: To provide a surface elastic wave apparatus that suppresses occurrence of fine ripples within a pass band, improves insertion loss and enhances the degree of balance. First and second surface acoustic wave elements (14, 15) that are parallel-connected to a surface acoustic wave resonator (16) respectively have three or more odd-numbered IDTs (2-4, 5-7), each having a plurality of electrode fingers placed along a propagation direction of a surface acoustic wave that is propagated over a piezoelectric substrate (1), and reflectors (8, 20, 21, 10), each having a plurality of electrode fingers that are placed on the two ends of the IDT row, and among all the electrode fingers respectively possessed by the IDTs and reflectors, the polarities of the electrode fingers placed adjacent to a different IDT or reflector are arranged symmetrically centered on the IDT located in the center.

Abstract: A plurality of IDT electrodes 2 to 7 each having a large number of electrode fingers extending in a direction perpendicular to a propagation direction of a surface acoustic wave propagating on a piezoelectric substrate 1 are arranged on the piezoelectric substrate 1 along the propagation direction, and each of the two adjacent IDT electrodes out of the plurality of IDT electrodes 2 to 7 comprises a variable pitch section and a fixed pitch section. The electrode finger pitch in the variable pitch section gradually decreases toward the boundary between the two adjacent IDT electrodes, and the minimum electrode finger pitch portion in the two variable pitch sections is on one side spaced apart from the boundary. There can be provided a surface acoustic wave apparatus having a large pass bandwidth, having a low insertion loss, and having improved flatness in a pass band.

Abstract: A surface acoustic wave device includes front stage and rear stage surface acoustic wave elements, a signal wiring connecting between the front stage and rear stage surface acoustic wave elements, a reference potential wiring connected with the rear stage surface acoustic wave element and a capacitor made of an insulator interposed between the signal wiring and the reference potential wiring. A surface acoustic wave device includes a front stage surface acoustic wave resonator, a rear stage surface acoustic wave element, a signal wiring connecting between the front stage surface acoustic wave resonator and the rear stage surface acoustic wave element, a reference potential wiring connected with the rear stage surface acoustic wave element and a capacitor made of an insulator interposed between the signal wiring and the reference potential wiring. A communication device includes the surface acoustic wave device described above, a receiver circuit or a transmitter circuit.

Abstract: A plurality of IDT electrodes 2 to 7 each having a large number of electrode fingers extending in a direction perpendicular to a propagation direction of a surface acoustic wave propagating on a piezoelectric substrate 1 are arranged on the piezoelectric substrate 1 along the propagation direction, and each of the two adjacent IDT electrodes out of the plurality of IDT electrodes 2 to 7 comprises a variable pitch section and a fixed pitch section. The electrode finger pitch in the variable pitch section gradually decreases toward the boundary between the two adjacent IDT electrodes, and the minimum electrode finger pitch portion in the two variable pitch sections is on one side spaced apart from the boundary. There can be provided a surface acoustic wave apparatus having a large pass bandwidth, having a low insertion loss, and having improved flatness in a pass band.

Abstract: IDT electrodes are arranged on a piezoelectric substrate along a propagation direction of a surface acoustic wave whereas reflectors are each interposed between a respective pair of IDT electrodes, the reflectors each including four or more electrode fingers extended perpendicularly to the propagation direction. An electrode-finger pitch ‘a’ of the reflector is progressively decreased from the opposite ends of the reflector toward the center thereof. Frequencies allowed to pass through a pass band may be controlled by varying the electrode-finger pitch. Thus is provided a surface acoustic wave device featuring a wide-band transmission performance.

Abstract: IDT electrodes are arranged on a piezoelectric substrate along a propagation direction of a surface acoustic wave whereas reflectors are each interposed between a respective pair of IDT electrodes, the reflectors each including four or more electrode fingers extended perpendicularly to the propagation direction. An electrode-finger pitch ‘a’ of the reflector is progressively decreased from the opposite ends of the reflector toward the center thereof. Frequencies allowed to pass through a pass band may be controlled by varying the electrode-finger pitch. Thus is provided a surface acoustic wave device featuring a wide-band transmission performance.

Abstract: A fur material (1) includes an elastic net (2) and a fur strip (3) provided with real or artificial hair (3a). The net (2), made up of warps (4) and wefts (5), is stretchable in one or more directions. The fur strip (3) is wound around one of the wefts (5) that is reinforced by an auxiliary string (6). The net (2) is provided with an attachment area (2a) to be brought into engagement with buttons on clothes.

Abstract: A fur material (1) includes an elastic net (2) and a fur strip (3) provided with real or artificial hair (3a). The net (2), made up of warps (4) and wefts (5), is stretchable in one or more directions. The fur strip (3) is wound around one of the wefts (5) that is reinforced by an auxiliary string (6). The net (2) is provided with an attachment area (2a) to be brought into engagement with buttons on clothes.

Abstract: It has been difficult to form a high-frequency electronic circuit using a single-crystal dielectric substrate, and down-sizing of high-frequency electronic circuits is also difficult because of necessity of a metal housing.