Abstract: A communication system includes plural management control units each managing a state of a battery; and plural terminal devices each acquiring battery information about at least one battery and communicating the acquired battery information with at least one of the plural management control units. At least one of the plural management control units includes an abnormality determination unit that is configured to determine whether an abnormality has occurred in an other management control unit based on communication with the other management control unit via an inter-management communication device for performing communication with the other management control unit.

Abstract: A radio-frequency module including a mounting substrate that has mounting faces opposed to each other; a PA that is mounted on the mounting face, that is a radio-frequency component, and that has an emitter terminal; a through electrode that is connected to the emitter terminal of the PA and that passes through the mounting faces of the mounting substrate; and a ground terminal connected to the through electrode.

Abstract: In a communication system having plural management devices and plural terminal devices, the management device included in a first group and the management device included in a second group each include a respective multi-band communication device performing communication using a first frequency band and a second frequency band. The terminal device included in the first group and the terminal device included in the second group each include a respective specific communication device performing communication using assigned frequency bands assigned to the respective groups to which subject terminal devices belong.

Abstract: Provided is a rectangular secondary battery with improved rigidity against vibrations and impacts. A rectangular secondary battery of the present invention includes: a flat-shaped electrode group; a current-collecting plate electrically connected to the electrode group; a battery case accommodating the current-collecting plate and the electrode group; a battery cover that closes an opening of the battery case; an electrode terminal penetrating through the battery cover, the electrode terminal being connected to the current-collecting plate via a connecting member; and a gasket that is inserted between the electrode terminal and the battery cover for insulating and sealing. An insulator is disposed between the current-collecting plate and the battery cover, the battery cover includes a battery cover side fixing part that fixes the insulator, and the insulator includes a current-collecting plate side fixing part that fixes the current-collecting plate.

Abstract: A communication system in a housing including a first communication device and a second communication device has, in at least one of the first communication device and the second communication device, an antenna structure installed at a position between a device arrangement surface and a specific surface. The housing has an inside member arranged substantially in parallel with a battery arrangement surface at a position at least one of above and below the antenna structure. The inside member has, formed thereon, at least one opening that opens in a vertical direction. The at least one of the first communication device and the second communication device serving as a specific communication device include an antenna having directivity set in a predetermined direction range including at least a direction in which the opening of the inside member is located.

Abstract: A wireless communication system includes an aggregate node and sensor nodes wirelessly communicable with the aggregate node. The sensor nodes each transmit data to the aggregate node in a respective scheduled data transmission cycle whenever in a connected state which enables wireless communication therewith. The sensor nodes each cyclically transmits a connection request for wireless communication to the aggregate node whenever in a disconnected state. Then, the sensor nodes each set a request transmission cycle for transmission of the connection request. As to the request transmission cycle, in a situation of being put in a disconnected state unintentionally, the sensor nodes each shorten the request transmission cycle relative to a cycle used in a situation of being intentionally put in a disconnected state.

Abstract: An antenna device includes one or more zeroth-order resonant antennas and a metal body. Each of the zeroth-order resonant antennas includes a ground plate configured to provide a ground potential, an opposing conductor arranged at a predetermined distance from the ground plate in a plate thickness direction of the ground plate, a power supply line electrically connected to the opposing conductor, and a short-circuit portion electrically connecting the opposing conductor and the ground plate. The metal body is configured to limit a propagation direction of a radio wave transmitted from or received by the one or more zeroth-order resonant antennas and has an opening.

Abstract: An antenna device is a device of 0th-resonance antenna, which includes: a ground plate providing a ground potential; an opposed conductor arranged to have a predetermined distance from the ground plate in a plate thickness direction of the ground plate and configured for connection to a feeder line; and a short-circuit part electrically connecting the opposed conductor and the ground plate. The antenna device further includes an intermediate conductor having a same potential as the ground plate and arranged in between the ground plate and the opposed conductor in the plate thickness direction. The intermediate conductor includes a penetration part that includes the opposed conductor in a plan view in the plate thickness direction.

Abstract: A radio-frequency module includes a switch performing switching of the connection between a common terminal and a selection terminal, a reception filter having a reception band in a band A as a passband, a transmission filter that has a transmission band in a band B as a passband and has an output terminal connected to the selection terminal, a filter that has the transmission band in a band B as an attenuation band and has an input terminal connected to the selection terminal, a reception path which connects the selection terminal and an input terminal of the reception filter and on which the filter is disposed, a bypass path which connects the selection terminal and the input terminal of the reception filter and on which no filter is disposed, and a transmission path which connects the selection terminal and a transmission terminal and on which the transmission filter is disposed.

Abstract: A communication system disposed in a housing includes multiple communication devices each of which performing a wireless communication with one another. The communication devices include a specific communication device disposed on a mounting surface. The specific communication device includes at least one antenna structure, and the at least one antenna structure includes at least one antenna. The at least one antenna structure is disposed between the mounting surface and a predetermined wall surface of the housing. A gap between an outer shell of the at least one antenna structure and the predetermined wall surface of the housing is smaller than a wavelength of a radio wave used in the wireless communication of the communication devices. The at least one antenna of the specific communication device has a directivity in a direction parallel to the mounting surface.

Abstract: An antenna is disposed, as a part of a conductor, on a substrate. The antenna includes a main plate providing a ground potential; and a patch portion arranged to face the main plate in Z direction. The substrate has a no-arrange region in which no conductor is arranged as a region between a periphery and the main plate in a plan view. A metal support portion of a case is in contact with the no-arrange region on a bottom surface of the substrate. The metal member is in contact with the no-arrange region on a top surface or on a bottom surface opposite to the top surface in the plate thickness direction of the substrate.

Abstract: A radio-frequency module including a mounting substrate that has mounting faces opposed to each other; a PA that is mounted on the mounting face, that is a radio-frequency component, and that has an emitter terminal; a through electrode that is connected to the emitter terminal of the PA and that passes through the mounting faces of the mounting substrate; and a ground terminal connected to the through electrode.

Abstract: A wireless communication device includes: a substrate containing a dielectric; a zeroth-order resonance antenna; a high frequency circuit mounted on the substrate and a metal body mounted on the substrate. The zeroth-order resonance antenna includes: a main plate providing a ground potential, a patch portion, a feeder line extending from a feeding point to the patch portion to electrically connect the patch portion and the high frequency circuit, at least a part thereof being arranged on a same surface as the patch portion on the substrate, and a short circuit portion. The metal body has a same potential as the main plate. The metal body has a longer length (greater height) than the patch portion in a Z direction.

Abstract: A radio-frequency module is capable of being connected to an external substrate and includes a mounting substrate having a main face and a main face, which are opposed to each other, multiple ground terminals with which the mounting substrate is electrically connected to the external substrate, a PA mounted on the main face, and an LNA mounted on the main face. A communication apparatus includes the radio-frequency module.

Abstract: A radio-frequency module includes a transmission path which has one end connected to a transmission terminal and on which a transmission signal in Band A is transmitted; a reception path (62) which has one end connected to a reception terminal (120B) and on which a reception signal in Band B is transmitted; a reception path (63) which has one end connected to a reception terminal (120C) and on which a reception signal in Band C is transmitted; a switch (11) having a common terminal (11a) and selection terminals (11b and 11c); and a switch (12) having a common terminal (12a) and selection terminals (12b and 12c).

Abstract: A radio-frequency module including a mounting substrate that has mounting faces opposed to each other; a PA that is mounted on the mounting face, that is a radio-frequency component, and that has an emitter terminal; a through electrode that is connected to the emitter terminal of the PA and that passes through the mounting faces of the mounting substrate; and a ground terminal connected to the through electrode.

Abstract: A radio-frequency module includes a mounting substrate having a first main surface and a second main surface on opposite sides of the mounting substrate; an external connection terminal arranged on the first main surface; and a first transmission power amplifier arranged on the first main surface. The first transmission power amplifier includes an amplifier first main surface closest to the first main surface, an amplifier second main surface that faces away from the amplifier first main surface, a first input-output electrode arranged on the amplifier first main surface and through which a radio-frequency signal input into the first transmission power amplifier or a radio-frequency signal output from the first transmission power amplifier is transmitted, and a first ground electrode arranged on the amplifier second main surface.

Abstract: An antenna device includes a main board, a ground board, a patch, a power feeder, a short-circuit portion and an additional conductor. The main board is made of a dielectric material. The ground board is disposed at the main board and supplies a ground potential. The patch is disposed at the main board to face the ground board in a thickness direction of the main board. The power feeder is disposed at the main board and electrically connected to the patch. The short-circuit portion is a via conductor disposed at the main board, and is electrically connected to the patch and the ground board. The additional conductor is disposed at the main board such that a side surface of the additional conductor faces a side surface of the patch, and has a potential identical to the ground potential of the ground board.

Abstract: A radio-frequency module includes a transmission path which has one end connected to a transmission terminal and on which a transmission signal in Band A is transmitted; a reception path (62) which has one end connected to a reception terminal (120B) and on which a reception signal in Band B is transmitted; a reception path (63) which has one end connected to a reception terminal (120C) and on which a reception signal in Band C is transmitted; a switch (11) having a common terminal (11a) and selection terminals (11b and 11c); and a switch (12) having a common terminal (12a) and selection terminals (12b and 12c).

Abstract: A radio frequency module includes: a switch circuit including a transmit terminal, a receive terminal, a selection terminal, and a common terminal, the switch circuit being capable of switching between (A) a connection between the transmit terminal and the common terminal, (B) connections between the transmit terminal and the common terminal and between the selection terminal and the common terminal, (C) connections between the receive terminal and the common terminal and between the selection terminal and the common terminal, and (D) a connection between the receive terminal and the common terminal; a transmit/receive filter connected to the common terminal and to be used for a time division duplex system, a pass band of the transmit/receive filter being a transmit/receive band of Communication Band A; and a DTC connected to the selection terminal, the DTC changing its capacitance value according to connection switching of the switch circuit.