Abstract: A power amplifier circuit that includes a carrier amplifier, peaking amplifiers, an input coil, an output coil, an input coil, an output coil, an output terminal to which one end of the output coil is connected, and ¼-wavelength transmission lines. The carrier amplifier is connected to one end of the input coil. The peaking amplifier is connected to one end of the ¼-wavelength transmission line. The peaking amplifier is connected to one end of the input coil. The peaking amplifier is connected to one end of the ¼-wavelength transmission line. The other end of the ¼-wavelength transmission line is connected to the other end of the input coil. The other end of the ¼-wavelength transmission line is connected to the other end of the input coil. One end of the output coil is connected to the other end of the output coil.

Abstract: A ferrite sintered body contains a main component and a sub component. The main component contains from 4 mol % to 13 mol % of Fe in terms of Fe2O3, from 47 mol % to 58 mol % of Zn in terms of ZnO, from 1 mol % to 4 mol % of Cu in terms of CuO, from 2 mol % to 8 mol % of Ni in terms of NiO, and from 28 mol % to 36 mol % of Si in terms of SiO2. The sub component contains, per 100 parts by weight of the main component, from 0.8 parts by weight to 3 parts by weight of Bi in terms of Bi2O3, from 0.003 parts by weight to 0.1 parts by weight of Mn in terms of Mn2O3, and from 0.003 parts by weight to 0.1 parts by weight of Cr in terms of Cr2O3.

Abstract: A multilayer inductor component includes an element body and an inductor wire. The element body has a bottom surface, and a surface parallel to the bottom surface is a top surface. The inductor wire has inductor conductors extending parallel to the bottom surface and via conductors extending along an orthogonal axis orthogonal to the bottom surface. The area of each inductor conductor when viewed in the direction along the orthogonal axis is a conductor area, and the number of the inductor conductors is N. In the direction along the orthogonal axis, a top surface-side conductor area that is a sum of conductor areas of the inductor conductor closest to the top surface to the N/2th inductor conductor is 1.1 times or more of a bottom surface-side conductor area that is a sum of conductor areas of the inductor conductor closest to the bottom surface to the N/2th inductor conductor.

Abstract: A connector includes a plurality of inner terminals and an outer terminal. The plurality of inner terminals are arrayed with intervals therebetween in a direction. The plurality of inner terminals are terminals that are connected to a ground potential. The outer terminal is disposed around the group of the plurality of arrayed inner terminals and are connected to a ground potential. The outer terminal includes side wall members that are shaped so as to extend in the direction and be parallel to the plurality of inner terminals. The inner terminals include connection parts that are connected to the side wall members.

Abstract: A first amplifier circuit in a preceding stage, a second amplifier circuit in a subsequent stage, and a ground external connection terminal are disposed on a substrate. The first and second amplifier circuits each include bipolar transistors, capacitive elements for the respective bipolar transistors, and resistive elements for the respective bipolar transistors. The bipolar transistors each include separate base electrodes, that is, a first base electrode for radio frequency and a second base electrode for biasing. The bipolar transistors of the second amplifier circuit include emitter electrodes connected to the ground external connection terminal. The minimum spacing between the first base electrode and an emitter mesa layer of at least one of the bipolar transistors of the second amplifier circuit is greater than the minimum spacing between the first base electrode and am emitter mesa layer of each of the bipolar transistors of the first amplifier circuit.

Abstract: Acoustic resonator devices, filters, and methods are disclosed. An acoustic resonator includes a substrate and a lithium niobate (LN) plate having front and back surfaces and a thickness ts. The back surface is attached to a surface of the substrate. A portion of the LN plate forms a diaphragm spanning a cavity in the substrate. An interdigital transducer (IDT) is formed on the front surface of the LN plate with interleaved fingers of the IDT disposed on the diaphragm. The LN plate and the IDT are configured such that a radio frequency signal applied to the IDT excites a shear primary acoustic wave in the diaphragm. Euler angles of the LN plate are [0°, ?, 0° ], where 0???60°. A thickness of the interleaved fingers of the IDT is greater than or equal to 0.8 ts and less than or equal to 2.0 ts.

Abstract: A multilayer ceramic capacitor includes a laminate and an external electrode. The laminate includes a central layer portion in which first and second internal electrode layers are alternately laminated with a dielectric ceramic layer therebetween, a peripheral layer portion sandwiching the central layer portion in the lamination direction, and a side margin sandwiching the central layer portion and the peripheral layer portion in the width direction. When a point P indicates an end in the width direction of the internal electrode layer closest to a main surface of the laminate, and a point Q indicates a point where a boundary between the peripheral layer portion including the point P and the side margin including the point P intersects the main surface, and an imaginary line IL is drawn to pass through the point P and the point Q, the boundary is curved from the imaginary line IL.

Abstract: A multilayer coil component includes an element body that includes a plurality of insulating layers laminated together, a coil that is embedded in the element body and that includes a coil conductor layer provided between the insulating layers, and a first outer electrode and a second outer electrode each of which is provided on at least one of outer surfaces of the element body and each of which is electrically connected to the coil. A dissimilar-material layer that is made of a material different from the insulating layers is provided on at least one of the outer surfaces of the element body that extend in a lamination direction in which the plurality of insulating layers are laminated together.

Abstract: A secondary battery including an electrode assembly including a positive electrode, a negative electrode, and a separator disposed between the positive electrode and the negative electrode, and an electrolyte encapsulated in an exterior body. The exterior body has a shape with a cutout portion in planar view thereof, and the exterior body has a seal portion along a peripheral edge portion thereof. The seal portion is folded in a thickness direction of the secondary battery to form a folded seal portion having an end on a cutout portion side to form a stopper portion for a board disposed in the cutout portion.

Abstract: A resonator includes a base; and at least three vibrating arms having first ends connected to a front end of the base and second ends that are open ends spaced away from the front end. Each vibrating arm includes an arm portion having a part that extends from the fixed end in a direction toward the open end with a constant width and a mass-adding portion that is connected to a tip of the arm portion and has a larger width than the arm portion. An interval between the mass-adding portions is larger than an interval between the arm portions for any two vibrating arms that are adjacent to each other.

Abstract: This disclosure describes a micromechanical device comprising a first device part and a second device part. One of the first and second device parts is a mobile rotor and the other of the first and second device parts is a fixed stator. The micromechanical device further comprises a motion limiter which extends from the first device part to the second device part. The motion limiter comprises an elongated lever, and the motion limiter is configured to bring a stopper into contact with a counter-structure by rotating the elongated lever.

Abstract: An electronic device is provided that includes a first display unit including a first display; a second display unit including a second display disposed on a side of the first display and being rotatable with respect to the first display unit about a rotation axis extending in a front-rear direction such that an angle formed by the first and displays change; an angle and angular velocity acquisition unit that acquires the angle formed by the first and second displays and angular velocity of the angle; and a control unit that, when a user rotates the second display unit with respect to the first display unit, determines whether a horizontal direction of a video to be displayed on the first and second displays is made to match a vertical direction or a left-right direction based on the angle and the angular velocity acquired by the acquisition unit.

Abstract: An RFID reader/writer antenna device is provided that includes a first radiating element, a second radiating element, a third radiating element, baluns, a phase shifter, and a distributor. The radiating elements each comprise conductor patterns with extending directions that are parallel to each other, and used for reading or writing of RFID tags. The distributor connects the first radiating element, the second radiating element, and the third radiating element to a common input/output. The phase shifter causes a feeding phase of the second radiating element and feeding phases of the first radiating element and the third radiating element to have a phase difference of 90°. The baluns perform conversion between a balanced signal and an unbalanced signal.

Abstract: An electronic card with biometric authentication function includes a communication antenna for short-range wireless communication, a wireless communication IC, a receiving coil, a resonant capacitor, a rectifying and smoothing circuit, a biometric sensor, and a biometric authentication circuit. The communication antenna and the receiving coil respond to a magnetic field in the same frequency band for the short-range wireless communication. The wireless communication IC performs short-range wireless communication. The receiving coil receives power from the magnetic field in the same frequency band for the short-range wireless communication. The biometric authentication circuit causes the biometric sensor to operate by using the power received from the receiving resonant circuit.

Abstract: A filtration filter according to the present invention includes a surface layer composed mainly of Pd, a base material inside the surface layer and composed mainly of a PdNi alloy, and an intermediate layer between the surface layer and the base material, wherein the intermediate layer is composed mainly of a PdNi alloy in which a Pd:Ni ratio changes from a surface layer side toward a base material side.

Abstract: A power amplifier circuit includes an external input terminal, an external output terminal, a power amplifier connected to the external input terminal, power amplifiers, a power supply terminal connected to the power amplifier, and a power supply terminal connected to the power amplifier. The power amplifiers are connected in parallel with each other between the power amplifier and the external output terminal. A first power supply voltage which is variable to multiple discrete first voltage levels is supplied to the power amplifier via the power supply terminal. A second power supply voltage which is variable to multiple discrete second voltage levels is supplied to the power amplifier via the power supply terminal. The multiple discrete second voltage levels are different from the multiple discrete first voltage levels.

Abstract: A radio frequency circuit includes power amplifiers, a transformer, a filter having a band A as a pass band, a filter having a band B as a pass band, a filter having a band C as a pass band, matching circuits connected to one end of an output side coil, and matching circuits connected to the other end of the output side coil. The matching circuit includes a capacitor disposed at a first path, a switch connected to the first path and a ground, a switch and an inductor connected in series, and the matching circuit includes a capacitor disposed at a second path, and a switch and an inductor connected in series, and the matching circuit includes a switch connected to a third path and the ground.

Abstract: A vibrating device includes a vibrating element, a support, and a connector. The vibrating element includes a vibrating body that is tubular and includes a first opening end surface and a second opening end surface. The support extends in an axial direction and supports the vibrating body, the axial direction being a direction connecting the first opening end surface and the second opening end surface of the vibrating body. The connector connects the vibrating body and the support to each other. The vibrating body vibrates in a breathing vibration mode to generate a first node and a second node on the vibrating element at different positions in the axial direction. The connector is positioned between the first node and the second node.

Abstract: A winding-type coil component includes a first wire and a second wire having a twisted wire portion where the first wire and the second wire are twisted together. Switching positions of the first wire and the second wire in the twisted wire portion are shifted in a circumferential direction of a winding core portion every turn.