Abstract: A reflector of the elastic wave resonator in an elastic wave device has first and second regions. The second region has third and fourth regions. The first region is located near to the IDTs of the reflector, while the second region is located farther from them. The third region is located nearer to the IDTs in the second region, while the fourth region is located farther from them. As a result that the center frequency of the reflection band in the fourth region is lower than that in the third region, an elastic wave device with low energy loss and insertion loss is provided.

Abstract: An electronic component includes: an element that is located on a substrate; a signal wiring that is located on the substrate and electrically connected to the element; a metal plate that is located so as to form a cavity on a functional part of the element and covers an upper surface of the cavity; a support post that is located on the substrate so as not to be located on the signal wiring, and supports the metal plate; and an insulating portion that covers the metal plate and the support post, and contacts a side surface of the cavity.

Abstract: An elastic wave filter device having improved sharpness of filter characteristics includes a longitudinally-coupled resonator-type elastic wave filter section including first to third IDT electrodes each including a plurality of electrode fingers, and first and second reflectors. The first to third IDT electrodes include narrower-pitch portions provided in end portions thereof, which are each adjacent to another IDT electrode in a direction of propagation of elastic waves, each of the narrower-pitch portions having a smaller period of electrode fingers than a period of electrode fingers in the remaining portion of the relevant IDT electrode. The number of electrode fingers in the narrower-pitch portion of the second IDT electrode, which is disposed on the side closer to the first IDT electrode, and the number of electrode fingers in the narrower-pitch portion of the second IDT electrode, which is disposed on the side closer to the third IDT electrode, differ from each other.

Abstract: An elastic wave device that suppresses high-frequency spurious components caused by unwanted waves, such as bulk waves, and improves filter characteristics, includes a piezoelectric substrate, an electrode structure including an IDT electrode provided on the substrate, a first wiring portion that is electrically connected to the IDT electrode, and a second wiring portion provided on a first insulating film that includes a through-hole partially exposing the first wiring portion therethrough. The second wiring portion extends into the through-hole and is electrically connected to the first wiring portion. The second wiring portion is arranged over an area other than the area in which the IDT electrode is disposed.

Abstract: A SAW device 11 has an IDT which is provided on the principal surface of a quartz crystal substrate 12 having Euler angles (?1.5°???1.5°, 117°???142°, 42.79°?|?|?49.57°) and excites a SAW in a stopband upper end mode, and a pair of reflectors which are arranged on both sides of the IDT. Inter-electrode-finger grooves are recessed between the electrode fingers of the IDT, and inter-conductor-strip grooves are recessed between the conductor strips of the reflectors. The wavelength ? of the SAW and the depth G of the inter-electrode-finger grooves satisfy 0.01??G. An IDT line occupancy ? and the depth G of the inter-electrode-finger grooves satisfy a predetermined relational expression. The IDT line occupancy ? and a reflector line occupancy ?r satisfy the relationship ?<?r. Therefore, an excellent frequency-temperature characteristic and a high Q value in an operation temperature range are realized simultaneously.

Abstract: A fully-functional radio receiver fabricated from a single nanotube is being disclosed. Simultaneously, a single nanotube can perform the functions of all major components of a radio: antenna, tunable band-pass filter, amplifier, and demodulator. A DC voltage source, as supplied by a battery, can power the radio. Using carrier waves in the commercially relevant 40-400 MHz range and both frequency and amplitude modulation techniques, successful music and voice reception has been demonstrated. Also disclosed are a radio transmitter and a mass sensor using a nanotube resonator device.

Abstract: An acoustic wave filter includes: multimode filters, each including an IDT, connected in parallel; a ceiling that is commonly located above at least two multimode filters of the multimode filters so as to form a cavity between the IDT and the ceiling, electrically connected to the multimode filters, and formed of a metal; and at least two terminals that are electrically connected to the ceiling and located above the at least two multimode filters.

Abstract: An elastic wave device includes a piezoelectric substrate, an IDT electrode located on the piezoelectric substrate, and a capacitive electrode that is located on the piezoelectric substrate and is connected in series with the IDT electrode. The capacitive electrode includes a plurality of capacitive electrode portions, each of which includes a pair of mutually interdigitated comb-shaped electrodes. The plurality of capacitive electrode portions are connected with each other in parallel. The plurality of capacitive electrode portions are arranged such that an intersecting width direction D1 of the capacitive electrode portions is inclined with respect to an intersecting width direction D2 of the IDT electrode. The plurality of capacitive electrode portions are arrayed in an elastic-wave propagating direction D3 of the IDT electrode.

Abstract: According to an aspect of the invention, each of a filter, a duplexer and a communication module includes a plurality of series resonators connected to a signal line in series and a plurality of parallel resonators connected to the signal line in parallel. At least two of the plurality of parallel resonators are connected to the signal line between two of the plurality of series resonators in parallel, inductors are respectively connected to the at least two parallel resonators, and the inductors have different inductances from each other.

Abstract: The antenna sharing device has a first elastic-wave filter for passing signals of a first frequency passband and a second elastic-wave filter for passing signals of a second frequency passband higher than the first frequency passband. The first elastic-wave filter is a ladder-type filter including a first series resonator and a second series resonator having an antiresonant frequency point higher than that of the first series resonator. The first series resonator has a first IDT electrode and a first dielectric film covering the electrode. The second series resonator has a second IDT electrode and a second dielectric film covering the electrode. The first and the second dielectric films have a first projection and a second projection, respectively, so as to be formed above the electrode fingers of each IDT electrode.

Abstract: A surface acoustic wave device includes first interconnections and second interconnections connected to a potential different from a potential connected to the first interconnections that are arranged on a piezoelectric substrate. The first interconnections three-dimensionally intersect with the second interconnections with insulating layers made of a thermosetting resin, disposed therebetween. Interdigital electrodes defining IDTs are films which have six-fold rotational symmetric spots appearing in an XRD pole figure and which are defined by Al films or Al—Cu alloy films containing Cu in an amount not greater than the solubility limit at about 25° C.

Abstract: A surface acoustic wave resonator has a quartz crystal substrate having Euler angles of (?=0°, 110°???150°, 88°???92°) and an IDT having a plurality of electrode fingers disposed on the quartz crystal substrate, and using a surface acoustic wave as an excitation wave, a plurality of grooves arranged in a propagation direction of the surface acoustic wave to form stripes is disposed on the quartz crystal substrate, and the electrode fingers are disposed one of between the grooves and inside the grooves.

Abstract: A method for manufacturing a surface acoustic wave element that prevents curvature of a piezoelectric substrate when forming an electrode pattern includes a first step of bonding to a first principal surface of a piezoelectric substrate a support member having a linear expansion coefficient lower than a linear expansion coefficient of the piezoelectric substrate to form a composite substrate, a second step of forming a plurality of grooves in the support member of the composite substrate from a surface that is opposite to a bonding interface between the support member and the piezoelectric substrate, a third step of forming electrode patterns including at least one IDT electrode on a second principal surface of the piezoelectric substrate of the composite substrate, and a fourth step of dividing the composite substrate on which the electrode patterns are formed to form individual surface acoustic wave elements.

Abstract: A ladder-type filter having plural elastic-wave resonators provided on a series arm and a parallel arm in a ladder shape on a piezoelectric substrate. Each of the elastic-wave resonators has an interdigital electrode. The interdigital electrode has plural electrode finger pairs formed of electrode fingers extending from first and second bus bars. The interdigital electrode included in the elastic-wave resonator provided on the parallel arm has an electrode cross width of the electrode fingers extending from the first and second bus bars 23 times or more of the wavelength of elastic waves excited by the interdigital electrodes.

Abstract: A SAW device 11 has an IDT which is provided on the principal surface of a quartz crystal substrate 12 having Euler angles (?1.5°???1.5°, 117°???142°, 42.79°?|?|?49.57°) and excites a SAW in a stopband upper end mode, and a pair of reflectors which are arranged on both sides of the IDT. Inter-electrode-finger grooves are recessed between the electrode fingers of the IDT, and inter-conductor-strip grooves are recessed between the conductor strips of the reflectors. The wavelength ? of the SAW and the depth G of the inter-electrode-finger grooves satisfy 0.01??G. An IDT line occupancy ? and the depth G of the inter-electrode-finger grooves satisfy a predetermined relational expression. The IDT line occupancy ? and a reflector line occupancy ?r satisfy the relationship ?<?r. Therefore, an excellent frequency-temperature characteristic and a high Q value in an operation temperature range are realized simultaneously.

Abstract: A method of manufacturing a boundary acoustic wave device includes the steps of forming an electrode on a first medium layer, forming a second medium layer so as to cover the electrode on the first medium layer, and forming a sound absorbing layer on an external surface of the second medium layer. The sound absorbing layer has an acoustic velocity of transverse waves that is lower than an acoustic velocity of transverse waves of the second medium layer.

Abstract: An on-axis rf power coupler for a superconducting particle accelerator includes a coaxial coupler tube that passes through a rf waveguide stub connected to a rf power source. The coupler tube is movable in translation along the axis of the beam path by a piezoelectric drive to permit variation of the coupling between the rf power source and the resonant signal in the accelerator. A tubular rf window extending through the waveguide stub, together with a vacuum bellows assembly connected to the coupler tube, isolate the vacuum inside the accelerator cavity from the vacuum in the rf waveguide and stub. A choke joint in the wall of the waveguide selectively passes unwanted HOM signals out of the waveguide stub and away from the accelerator cavity, where they are dissipated by ferrite tiles on the coupler tube. The upstream end of the coupler tube and a tubular extension of the accelerator cavity form a coaxial line for introducing rf power into the accelerator.

Abstract: An elastic wave device includes a piezoelectric substrate, a pair of reflectors disposed on the piezoelectric substrate along the propagation direction of an elastic wave, and first to fifth comb electrode pairs disposed in this order between the pair of reflectors. Ground comb electrodes of adjacent comb electrode pairs are connected by an even number of connection electrode fingers or by an odd number of connection electrode fingers.

Abstract: An acoustic wave device includes an interdigital transducer (IDT) electrode and a separate electrode facing the IDT electrode. The IDT electrode includes first and second comb-shaped electrode facing each other. The first comb-shaped electrode includes a first bus bar, first interdigitated electrode fingers, and first dummy electrode fingers. The second comb-shaped electrode includes a second bus bar second interdigitated electrode fingers interdigitated with the first interdigitated electrode fingers, second dummy electrode fingers facing the first interdigitated electrode fingers, weighted parts, and a non-weighted part. The weighted parts have electrodes at spaces between the second interdigitated electrode fingers and the second dummy electrode fingers. In the non-weighted part, there is no electrode at a space out of the spaces which is closest to the separate electrode in the non-interdigitated region.

Abstract: Aspects of a method and system for communicating via a spatial multilink repeater are provided. In this regard, a received signal may be frequency shifted to generate a plurality of repeated signals, wherein each repeated signal may be shifted by a different frequency with respect to the received signal. Each repeated signal may comprise one or more signal components and a phase and/or amplitude of each of the components may be controlled to control a directivity of the repeated signals. Each of the repeated signals may be generated by quadrature down-converting said received signal by mixing the received signal with a first LO signal pair, up-converting the down-converted signal by mixing it with a second LO signal pair, and adding or subtracting an in-phase portion and a quadrature-phase portion of the up-converted signal.

Abstract: An IDT electrode defining any one of a plurality of surface acoustic wave resonators defining series arm resonators and parallel arm resonators, except for the IDT electrode having a smallest amount of heat generation per unit time when a signal flows between first and second signal terminals, does not face wiring electrodes.

Abstract: An acoustic wave filter includes: at least a parallel resonator, wherein at least one of the parallel resonator includes a piezoelectric substance, an IDT located on the piezoelectric substance, and reflectors located on the piezoelectric substance so as to sandwich the IDT, and a distance between a first electrode finger that is an electrode finger closest to the reflector among electrode fingers of the IDT and a second electrode finger that is an electrode finger closest to the IDT among electrode fingers of the reflector is less than 0.25(?IDT+?ref) where a period of the electrode fingers of the IDT is ?IDT and a period of the electrode fingers of the reflector is ?ref.

Abstract: A small-sized elastic wave apparatus in which heat generated at a portion of a cascade connection between resonators is sufficiently dissipated includes on one main surface of a piezoelectric substrate in an elastic wave filter mounted on a base substrate on which an input/output wiring line, a ground wiring line, and a floating wiring line insulated from the input/output wiring line and the ground wiring line are provided, first electrodes coupled to the input/output wiring line or the ground wiring line, second electrodes coupled to the floating wiring line, resonators, connection wiring lines connecting the resonators, and electrode wiring lines connecting the resonators and the first electrodes. The second electrodes are disposed in contact with the connection wiring lines cascading the resonators.

Abstract: According to an aspect of the invention, each of a filter, a duplexer and a communication module includes a plurality of series resonators connected to a signal line in series and a plurality of parallel resonators connected to the signal line in parallel. At least two of the plurality of parallel resonators are connected to the signal line between two of the plurality of series resonators in parallel, inductors are respectively connected to the at least two parallel resonators, and the inductors have different inductances from each other.

Abstract: A surface acoustic wave filter includes a ?-rotated Y-cut X-propagation lithium niobate substrate. The cut angle ranges from 20° to 40°. An interdigital transducer can be used for exciting a surface acoustic wave that is formed on the substrate.

Abstract: A duplexer includes: a transmission filter connected between a common terminal and a transmission terminal; and a reception filter connected between the common terminal and a reception terminal, wherein the reception filter includes resonators located on a piezoelectric substrate, at least one resonator of the resonators is grounded, and a resonator located at a side closest to the common terminal out of the grounded resonator is a divided resonator that is divided into two or more, and a resonance frequency fr of the divided resonator is in a range of fr=2×(fTL to fTH)?(fRL to fRH) when a pass frequency of the transmission filter is fTL to fTH and a pass frequency of the reception filter is fRL to fRH.

Abstract: A variable capacitance element includes a piezoelectric substrate, a buffer layer located on the piezoelectric substrate with an orientation, a dielectric layer located on the buffer layer and having a relative dielectric constant that varies in accordance with an applied voltage, and a first electrode and a second electrode arranged to apply an electric field to the dielectric layer.

Abstract: A SAW element has a substrate, electrode fingers on an upper surface of the substrate, and mass-adding films on upper surfaces of the electrode fingers. When viewing the cross-sections perpendicular to the extending directions of the electrode fingers, the mass-adding films have the narrowest widths at an upper sides in the cross-sections. By arranging the mass-adding films having such shape on the upper surfaces of the electrode fingers, the electromechanical coupling factor can be made high.

Abstract: An acoustic wave filter has a first signal line connecting one among the plurality of first IDT electrodes and the first balanced signal terminal; a second signal line connecting the other first IDT electrode with the second balanced signal terminal; a third signal line connecting one among the plurality of second IDT electrodes with the second balanced signal terminal; and a fourth signal line connecting the other second IDT electrode with the first balanced signal terminal. The fourth signal line has an intersection portion three-dimensionally intersecting with a part of the second signal line. The intersection portion extends in a direction inclined relative to the second signal line on the major surface.

Abstract: An electronic component includes a support layer that surrounds an element region on a principal surface of a piezoelectric substrate, when viewed in plan from a z-axis direction. A surface acoustic wave element is provided in the element region. A cover layer is provided on the support layer, and is opposed to the principal surface. A pillar member connects the principal surface and the cover layer in a space surrounded by the principal surface, the support layer, and the cover layer, and does not contact with the support layer.

Abstract: An elastic guided acoustic wave coupling resonator filter includes a dielectric layer interposed between piezoelectric substrates, with interdigital transducers on each substrate generally positioned at an interface between the substrates and the dielectric layer. The interdigital transducers on one substrate are aligned with the transducers on the opposing substrate and include cascaded filter tracks. The cascaded orientation between the two filter tracks includes either a differential connection or a balanced connection. As a result, the interdigital transducers are electrically isolated yet acoustically coupled to each other.

Abstract: A device, comprising a substrate having opposing first and second surfaces, a first surface acoustic wave resonator disposed on the first surface of the substrate, a second surface acoustic wave resonator disposed on the second surface of the substrate, a first adhesive layer sandwiched between the first surface acoustic wave resonator and the substrate, and a second adhesive layer sandwiched between the second surface acoustic wave resonator.

Abstract: A filter includes: a filter circuit connected between a first terminal and a second terminal; and a matching circuit connected between the filter circuit and the second terminal, wherein an impedance viewed from the second terminal toward the matching circuit is less than an impedance viewed from a node between the filter circuit and the matching circuit toward the filter circuit.

Abstract: A filter module includes: reception filters connected between an antenna terminal and a reception terminal; and a module substrate, wherein a first reception filter that is at least one reception filter of the reception filters is embedded in the module substrate, and a second reception filter that is at least another one reception filter is mounted on a surface of the module substrate so as to overlap the first reception filter.

Abstract: An elastic wave device has a convex portion on the top face of a first dielectric layer over an IDT electrode when the elastic wave device has a structure of a boundary wave device in which a film thickness of a second dielectric layer is not less than 1.6 times as much as a pitch width of the IDT electrode. This convex portion increases an electromechanical coupling coefficient of SH wave that is the major wave. Accordingly, good filter characteristics can be easily achieved.

Abstract: A filter includes: acoustic wave resonators connected between an input terminal and an output terminal; and a cancel circuit including an input connection portion and an output connection portion connected so that the cancel circuit is connected in parallel to at least a part of the acoustic wave resonators, wherein the cancel circuit includes a first acoustic wave resonator connected between a node between the input connection portion and the output connection portion and a ground.

Abstract: According to an exemplary embodiment, a method of forming a metal layer having reduced roughness includes a step of forming a seed layer over a dielectric layer. The method further includes a step of forming the metal layer over the seed layer. The seed layer causes a top surface of the metal layer to have reduced roughness. The seed layer and the metal layer can be formed in a same process chamber or in different process chambers. The dielectric layer, the seed layer, and the metal layer having reduced roughness can be utilized in an acoustic mirror structure.

Abstract: A surface acoustic wave filter device uses a Rayleigh wave as a main mode, and includes a ladder type surface acoustic wave filter unit. A thickness of a dielectric layer in a surface acoustic wave resonator configuring a series arm resonator is different from thickness of a dielectric layer in a surface acoustic wave resonator configuring a parallel arm resonator. A propagation orientation of a surface acoustic wave in the surface acoustic wave resonator configuring the series arm resonator is different from a propagation orientation of a surface acoustic wave in the surface acoustic wave resonator configuring the parallel arm resonator.

Abstract: A filter includes a first signal line connected to one input-side unbalanced signal terminal, a second signal line connected to another output-side unbalanced signal terminal, a shunt circuit for providing connection between the first and second signal lines in parallel with a surface acoustic wave device, a first capacitor disposed in the first signal line so as to be in series with respect to the surface acoustic wave device, a first inductor disposed in the shunt circuit at a side of the first signal line, and a series resonance circuit having a second capacitor and a second inductor disposed in the shunt circuit at a side of the second signal line.

Abstract: An acoustic wave device includes a piezoelectric substrate, an IDT electrode provided on the piezoelectric substrate, a dielectric layer provided so as to cover the IDT electrode, and a first stress relaxation layer provided on the dielectric layer. Furthermore, the acoustic wave device includes an extraction electrode connected to the IDT electrode and extracted onto the first stress relaxation layer, and a bump provided on the extraction electrode. An elastic modulus of the first stress relaxation layer is smaller than that of the dielectric layer.

Abstract: A heated resonator includes a base substrate, a piezoelectric piece having a thickness and a top side and a bottom side, a first electrode on the top side, a second electrode opposite the first electrode on the bottom side, an anchor connected between the piezoelectric piece and the base substrate, and a heater on the piezoelectric material. A thermal resistor region in the piezoelectric piece is between the heater and the anchor.

Abstract: An elastic wave filter includes electrode fingers, a first busbar and a second busbar, and inclined electrode portions each having a narrower distance between the electrode fingers from the first busbar toward the second busbar. The elastic wave filter includes a dummy electrode disposed in at least one of the input-side IDT electrode portion and the output-side IDT electrode portion to suppress reflection of a diffracted elastic wave by the busbar and to suppress spurious response at an end portion in a frequency pass-band. The dummy electrode has a width dimension and a pitch that are determined such that none of a period shorter than a shortest period of the electrode fingers and a period longer than a longest period of the electrode fingers is satisfied.

Abstract: A transmitting/receiving filter (filter device) according to one embodiment of the present invention is provided with a transmitting filter, a receiving filter, and a support substrate. The transmitting filter includes a first resonator constituted of a BAW device (FBAR, SMR). The receiving filter includes a second resonator constituted of a Lamb wave device. The support substrate supports both the transmitting filter and the receiving filter. The transmitting filter and the receiving filter are constituted of elastic wave resonators that resonate at different oscillation modes from each other, which allows miniaturization of the support substrate to be realized while preventing oscillation interference between the two filters.

Abstract: Disclosed embodiments include a surface acoustic wave device having electrode period, electrode width, and/or ratio of electrode width to electrode period varied in a prescribed manner.

Abstract: A tunable filter that is capable of magnifying a pass band width or increasing a frequency variable amount includes a resonator circuit portion provided in at least one of a series arm connecting an input terminal and an output terminal to each other and a parallel arm connecting the series arm and a ground potential to each other, a first variable capacitor is connected in series to the resonator circuit portion and a second variable capacitor is connected in parallel to the resonator circuit portion. The resonator circuit portion includes a piezoelectric substrate including LiNbO3 or LiTaO3, an elastic wave resonator including an electrode located on the piezoelectric substrate, and a bandwidth extending inductance Lx, Lx connected to the elastic wave resonator.

Abstract: A filter includes at least one series resonator and parallel resonators, the at least one series resonator and the parallel resonators including excitation electrodes and reflectors, the parallel resonators having different resonance frequencies, and at least one of the parallel resonators other than the parallel resonator having the highest resonance frequency being configured to have a pitch of reflectors that is smaller than that of excitation electrodes.

Abstract: An acoustic wave device includes: a piezoelectric film made of an aluminum nitride film containing a divalent element and a tetravalent element, or a divalent element and a pentavalent element; and an electrode that excites an acoustic wave propagating through the piezoelectric film.

Abstract: An elastic wave device includes a piezoelectric substrate, an IDT electrode disposed on the piezoelectric substrate, an internal electrode disposed on the piezoelectric substrate and connected to the IDT electrode, a support pillar disposed on the piezoelectric substrate and provided around the IDT electrode, a top panel provided on the support pillar to cover a space above the IDT electrode, an insulation protector provided to cover the support pillar and the top panel, an external electrode disposed on the insulation protector, a conductor pattern disposed on the insulation protector in order to obtain inductance, and a connection electrode provided through the insulation protector, to connect the external electrode and the internal electrode to each other.

Abstract: The present disclosure relates to a two-track surface acoustic wave (SAW) device that has a first SAW track and a second SAW track. The second SAW track may include an interconnecting grating that divides an acoustic cavity of the second SAW track into two acoustic cavities, which are acoustically coupled to one another. The first SAW track and the second SAW track may be electrically coupled to one another transversally via a first re-radiation interconnection and a second re-radiation interconnection. When the two-track SAW device is used in a bandpass filter, by including the interconnecting grating, insertion loss and roll-off response characteristics of the bandpass filter may be improved. Further, in one embodiment of the two-track SAW device, addition of capacitance between the re-radiation connections may improve return loss of the two-track SAW device.

Abstract: A boundary acoustic wave filter device includes an electrode structure provided at a boundary between a piezoelectric body and a dielectric body laminated on the piezoelectric body and utilizes an SH-type boundary acoustic wave that propagates along the boundary. In the boundary acoustic wave filter device, the electrode structure includes a longitudinally coupled resonator boundary acoustic wave filter portion that has a first IDT and second and third IDTs arranged respectively on both sides of the IDT in a direction in which the boundary acoustic wave propagates. At portions at which two IDTs are located adjacent to each other in the direction in which the boundary acoustic wave propagates, narrow pitch electrode finger portions are provided in the IDTs, and the pitch of the electrode fingers of the narrow pitch electrode finger portion is different from the pitch of the electrode fingers of each of the narrow pitch electrode finger portions.