116results about "Near-field systems using receivers" patented technology

To appropriately realize power reception processing in a power reception device mounted with an NFC function.SOLUTION: A power reception device for wirelessly receiving power from a power transmission device has: first control means for controlling processing related to power reception between itself and the power transmission device; second controlling means for controlling an NFC (Near Field Communication) function; and third control means for controlling the entire power reception means. The first control means controls operation of the second control means on the basis of an operation state of the third control means.SELECTED DRAWING: Figure 4

To provide a transmission device and a display system, capable of implementing bidirectional transmission of signals via a rotatable interface while implementing simplification of design and device cost reduction.SOLUTION: A transmission device comprises: a first interface device including a first antenna group provided around a first center point, the first antenna group being rotatable using the first center point as its rotation center and including a first antenna and a second antenna; and a second interface device including a second antenna group provided around a second center point, the second antenna group being rotatable using the second center point as its rotation center and including a third antenna and a fourth antenna. The first antenna faces the third antenna so that a first signal is transmitted from the first antenna to the third antenna; the second antenna faces the fourth antenna so that a second signal is transmitted from the fourth antenna to the second antenna.SELECTED DRAWING: Figure 2

To properly transmit power from a power transmitting device to multiple power receiving devices.SOLUTION: A power transmission device 100 wirelessly transmits power to a plurality of power receiving devices 200 using a time-sharing method. The power transmission device derives data on a plurality of power losses between the power transmission device 100 and the plurality of power receiving devices 200 on the basis of the plurality of received powers received from the plurality of power receiving devices 200, and detects foreign objects in a power transmission capable range of the power transmission device 100 on the basis of data on the plurality of power losses.SELECTED DRAWING: Figure 5

To provide a detection system capable of improving workability after opening after a container is opened.SOLUTION: The detection system includes a detection wireless tag in which a loop antenna part is arranged on an opening cutoff line displayed on the container, a confirmation wireless tag in which the loop antenna part is arranged in the area where the cutoff line is not displayed of the container, and a detection device. The detection device includes a device side antenna which transmits and receives signals to and from the loop antenna part by wireless communication, a reading part which can read the detection tag ID of the detection wireless tag and the confirmation tag ID of the confirmation wireless tag through the device side antenna respectively, a detection part which detects that the container is opened, when the detection tag ID cannot be read and when the confirmation tag ID can be read, and a storage part which stores an opening date when the container is opened, when it is detected that the container is opened.SELECTED DRAWING: Figure 1

To provide a reading system that can further improve accuracy of reading a wireless tag by ensuring visibility of a measurement object.SOLUTION: A reading system 1 comprises: an inspection chamber 2 that allows an object of measurement 10 including a plurality of articles 11 to which RFID tags 12 are attached to be placed therein from an opening 21, wherein the opening 21 is openable and closable by a door member 22; a placement table 3 that is provided in the inspection chamber 2 and on which the object of measurement 10 is placed; a driving device 5 that moves the placement table 3 at least in a horizontal direction; an RFID antenna 4 that is provided inside the inspection chamber 2 and reads information from the RFID tags 12 attached to the plurality of articles 11 that is placed on the placement table 3 and moved by the driving device 5; and a transparent member 24 that is provided on an outer face of the door member 22 of the inspection chamber 2 and allows visual recognition of the inside of the inspection chamber 2 from the outside. The inspection chamber 2, the door member 22, and the transparent member 24 are configured to have properties capable of blocking radio waves.SELECTED DRAWING: Figure 3

To provide a non-contact communication medium, a magnetic tape cartridge, a non-contact communication system, an operating method for the non-contact communication medium, and a program that can stabilize the supply of operating power to a processing circuit while enabling an external device to accurately read the contents of a response signal.SOLUTION: A non-contact communication medium communicates with an external device in a non-contact manner. The non-contact communication medium includes a resonant circuit, a regulator that generates operating power, a variable resistor, a switch, and a control circuit. The processing circuit generates a response signal in response to a command signal. The switch switches between a load-applying state in which a load of the variable resistor is applied to the resonant circuit and a non-loading state in which no load is applied to the resonant circuit in response to the response signal. The control circuit controls the resistance value in response to the escape power released from the regulator.SELECTED DRAWING: Figure 8

To provide a transmission device that can reduce the effects of manufacturing errors in transmission lines, ensure communication quality, and achieve high-speed communication.SOLUTION: A transmission device 10 includes a conductor part 110, a substrate disposed above the conductor part 110, and support members 121, 122 disposed on the conductor part 110 and supporting the substrate 100. The substrate 100 includes first electrode 101 and second electrode 102 forming a differential transmission line and a third electrode 103 disposed between the first electrode 101 and the second electrode 102. The conductor part 110 and the third electrode 103 function as a reference potential of the differential transmission line.SELECTED DRAWING: Figure 1

To prevent communication instability with a simple configuration when transmitting a differential signal using a first transmission line coupler having a gap and a second transmission line coupler opposing the first transmission line in a non-contact manner.SOLUTION: A wireless transmission system has a second transmission line coupler 111 of such a size that, when an input signal to a first transmission line coupler 101 is transmitted to a position where the first transmission line coupler 101 and the second transmission line coupler 111 are coupled in an electric field and / or a magnetic field, a signal width of a first signal generated by the second transmission line coupler 111 at rising and falling edges of the input signal to the first transmission line coupler 101 is approximately equal to or greater than the difference in transmission delays of gaps of the first transmission line coupler 101.SELECTED DRAWING: Figure 1

To allow a user to easily reach the position of a wireless tag which is a search target.SOLUTION: A search device of an embodiment includes an antenna with directivity, communication means, determination means, photographing means, and display means. The communication means wirelessly communicates, using the antenna, with a wireless tag to be searched. The determination means determines a relative position of the wireless tag with respect to the antenna based on a status of communication by the communication unit with the wireless tag to be searched. The photographing means obtains an image in a photographing range designated as a directional direction side of the antenna. The display means displays a screen in which a guide image for bringing the antenna closer to the position determined by the determination means is superimposed and represented on the image obtained by the photographing means.SELECTED DRAWING: Figure 3

To provide a method for near field communication with a serial interface microcontroller which does not employ a dedicated integrated circuit to reduce the cost, and a near field communication tag device using the same.SOLUTION: A method includes: providing a serial interface microcontroller; detecting a near field communication carrier wave using a near field communication LC resonant circuit; performing a frequency division to the near field communication carrier wave based on a near field communication protocol, to obtain a near field communication clock signal; filtering the near field communication carrier wave of the near field communication LC resonant circuit to obtain an envelope signal; sequentially receiving a digital sequence of the envelope signal according to triggering of the near field communication clock signal and a serial transmission protocol; and decoding near field communication data from the digital sequence of the envelope signal based on the near field communication protocol.SELECTED DRAWING: Figure 13

To achieve both acceleration of data transmission and a reduction in height of a radio communication device.SOLUTION: A radio communication device has a first antenna for performing radio communication by electromagnetic field coupling, and communication control means for transmitting or receiving signals in the first antenna. The first antenna includes a first conductor that has a shape along an arc shape centered on a predetermined axis, and a second conductor that is arranged on the inside of the first conductor with respect to the predetermined axis in a viewpoint in a reference direction parallel to the predetermined axis, and has a shape along an arc shape centered on the predetermined axis. A second signal fed to one end of the second conductor is fed with a predetermined amount of delay from a first signal fed to one end of the first conductor.SELECTED DRAWING: Figure 1

To improve communication efficiency in a wireless communication system that performs communication by electromagnetic coupling using a transmission line.SOLUTION: A communication device according to the present invention communicates with another communication device by electromagnetic field coupling, and includes a first conductor that transmits or receives a signal by the electromagnetic field coupling, a metal member that functions as a ground for the first conductor, a second conductor connected to the first conductor, and an electrode, one of which is connected to the second conductor, and the other of which is supplied with the signal or to which a termination resistor is connected.SELECTED DRAWING: Figure 1

Processing a signal originating from a node port experiencing ingress. A node that provides service to a plurality of cable modems will generally have a plurality of node ports. The node may be a Remote PHY Node or a Remote MACPHY node (RMN) for example. A detection is made that a particular node port of the node is experiencing ingress. In response, an upstream signal originating from the particular node port is analyzed to dynamically determine an amount to attenuate the upstream signal. The upstream signal is attenuated the dynamically determined amount prior to the signal being processed at an active device upstream from the particular node port experiencing the ingress. Distortion and / or saturation of the signal at the active device is advantageously prevented.

To improve possibility of correctly decoding tag data even if a coding speed as to a wireless tag is fluctuated.SOLUTION: A tag reader apparatus according to an embodiment of the present invention has an extracting unit, an acquiring unit, and a machine learning unit. The extracting unit extracts a data signal obtained by encoding data from a wireless signal. The acquiring unit acquires tag data transmitted by a wireless tag as a learning target without obtaining transmission from the wireless tag as the learning target. The machine learning unit carries out machine learning using the data signal extracted by the extracting unit from the wireless signal transmitted from the wireless tag as the learning target with setting the tag data acquired by the acquiring unit as a correct data, and determines, based on relationship obtained by the machine learning, a response data included in the data signal extracted by the extracting unit from the wireless signal transmitted from the wireless tag as a reading target.SELECTED DRAWING: Figure 5

A probe for receiving electrical signal transmissions from a transmitter across a slip ring interface includes a signal acquisition area including at least one segmented signal receiving strip positioned in spaced relation to the slip ring transmitter for receiving signals transmitted across the slip ring interface, the segmented signal receiving strip configured to receive a range of frequency signal content of signals and including a first signal receiving segment having a first frequency response, a second signal receiving segment electrically coupled to the first signal receiving segment and having a second frequency response below the first frequency response, and a third signal receiving segment coupled to the first signal receiving segment and having a third frequency response below the first frequency response.

To provide a communication apparatus that can make high-speed data transmission, and is adopted to a rotational movable part.SOLUTION: A communication apparatus includes: a differential transmission path that is formed by a first electrode and a second electrode for performing radio communication with another communication apparatus through electromagnetic field coupling; and communication means of transmitting a signal to the differential transmission path or receiving a signal from the differential transmission path. A first end of the differential transmission path is connected to the communication means, and a second end is terminated by a termination member. The first electrode and the second electrode are formed in an appropriate arc chape into an outer side and an inner side as a center of a predetermined shaft. A filter part for correcting a transportation delay difference by a wiring length difference of the first and second electrodes is inserted into the differential transmission path.SELECTED DRAWING: Figure 1

To provide an image forming apparatus and a wireless tag communication device that can perform wireless communication with an external wireless tag.SOLUTION: An image forming apparatus of an aspect 1 of an embodiment has a conveyance path, an antenna, and a shield member. A sheet is conveyed through the conveyance path. The antenna can perform wireless communication with a first wireless tag on the sheet located on the conveyance path. The shield member blocks, at a shield position, wireless communication between the antenna and a second wireless tag located on the opposite side of the conveyance path across the antenna. The shield member moves from the shield position to allow the wireless communication between the second wireless tag and the antenna.SELECTED DRAWING: Figure 1

To provide a semiconductor device capable of suppressing the heat generation of a transmission coil by flowing a current in constant to the transmission coil in a transformer.SOLUTION: A semiconductor device comprises a semiconductor substrate, a first coil, a second coil, a third coil; a fourth coil, a leading wire, and an insulation layer. The leading wire is formed at the same layer as the first and second coils on the semiconductor substrate. The first and second coils are adjacent to each other via the leading wire in a plan view, and are electrically connected in serial via the leading wire. The insulation layer covers the first coil, the second coil, and the leading wire. The third coil is formed on the first coil so as to be opposite to the first coil via the insulation layer. The fourth coil is formed on the second coil so as to be opposite to the second coil via the insulation layer. The third and fourth coils are adjacent to each other in the plan view, and are electrically connected to each other.SELECTED DRAWING: Figure 4

To provide a transmission system, a transmission cable, a transmission method, and a display device, capable of stably performing signal transmission.SOLUTION: A transmission system comprises: a sending circuit including a non-contact coupling element having a first electrode to which a rectangular signal is input and a second electrode for outputting a differentiation signal of the rectangular signal; and a receiving circuit that receives the differentiation signal output from the sending circuit via a transmission line and compares the differentiation signal with a threshold to restore the rectangular signal.SELECTED DRAWING: Figure 1

To provide an isolator which allows improvement in reliability.SOLUTION: An isolator comprises a first electrode, a second electrode, a conductor, and a first insulation layer. The second electrode is provided above the first electrode and is spaced apart from the first electrode. Along a first surface perpendicular to a first direction from the first electrode to the second electrode, the conductor is provided around the first electrode and the second electrode. The first insulation layer is provided on the second electrode and contains silicon, carbon, and nitrogen.SELECTED DRAWING: Figure 1

To provide load modulated power amplifiers and methods that can provide high efficiency over a wide dynamic range.SOLUTION: A load modulated power amplifier 10 includes: a power amplifier 5 that receives a radio frequency signal (RF input signal RFIN) at a reception input and provides an amplified radio frequency signal at an output; and a controllable load impedance 6 coupled to the output of the power amplifier 5. The controllable load impedance receives an envelope signal ENV that changes in relation to an envelope of the radio frequency signal. The envelope signal is operable to control an impedance of the controllable load impedance to modulate a load at the output of the power amplifier.SELECTED DRAWING: Figure 1

To make it possible to speed up the communication speed of wireless communication.SOLUTION: A wireless communication system includes a first communication device and a second communication device. The first communication device includes a modulator 113 that performs modulation processing, and a first coupler 111 for wirelessly transmitting a signal. The second communication device includes a second coupler 121 for wirelessly receiving the signal by at least one of electric field coupling and magnetic field coupling to the first coupler, and a demodulator 122 that performs decoding processing. The first communication device or the second communication device includes an equalizer 112 that performs equalization processing.SELECTED DRAWING: Figure 1

To enable a communication of a wireless LAN and a back scatter (BS) communication to be present together while avoiding collision of a signal of the wireless LAN and a BS signal regarding a wireless communication method appropriate for utilizing the BS communication.SOLUTION: A wireless device 10 comprising a function as an access point of a wireless LAN transmits a signal 12 for BS including a preamble signal 50 specified in the wireless LAN and a BS signal 52. A BS device 16 acquires drive power from the signal 12 for BS and transmits a modulation signal 14. The wireless device 10, which receives the modulation signal 14, processes the modulation signal 14 and sets up a BS communication. A wireless terminal 18 comprising a function for limiting data transmission according to a CSMA / CA approach limits the data transmission in reaction to the preamble signal 50.SELECTED DRAWING: Figure 5

To provide a technique that can improve the characteristics of a reception signal received on a receiving device side.SOLUTION: A receiving device 200 has a plurality of receiving electrodes 210 arranged at a position opposite one transmitting transmission line 130 of a transmitting device 100, and a connection path 240 connecting between the receiving electrodes in the plurality of receiving electrodes 210, and the connection path 240 includes at least one passive element 241 in series between the receiving electrodes in the plurality of receiving electrodes 210.SELECTED DRAWING: Figure 5

To reduce the influence of a self-interference signal even if the self-interference signal fluctuates during communication.SOLUTION: A communication device includes first and second generation units, a sharing unit, a synthesis unit, first and second measurement units, and first, second and third control units. The first and the second measurement units measure the levels of the self-interference signals each extracted from an output signal from the synthesis unit with respect to a first band width or a second band width wider than the first band width. The first control unit controls to reduce the level measured by the first measurement unit. in the period of a first duration, whereas the second control unit sets the variation of an amplitude and a phase in the second generation unit in the period of a second duration shorter than the first duration, according to that the level measured by the second measurement unit has increased. The third control unit controls the first control unit before starting the reception of a response signal transmitted from the opposite device, and the second control unit during receiving the response signal, to set the variation of the amplitude and the phase in the second generation unit, respectively.SELECTED DRAWING: Figure 4

To reduce the size of a backscatter type communication system.SOLUTION: A synthesis circuit includes a transmission circuit configured to be connected to an antenna, and a control circuit configured to control the impedance of the transmission circuit, and the transmission circuit includes multiple impedance circuits with different impedances, and multiple first switch elements, one of which is connected to each of multiple impedance circuits. The control circuit includes multiple comparators respectively connected to the first switch elements, and a voltage divider circuit composed of a plurality of resistance elements configured to divide an input reference voltage and output voltage divider power to each of the multiple comparators.SELECTED DRAWING: Figure 1

To miniaturize backscatter type wireless communication devices. [Solution] The transmission circuit includes at least two backscatter circuits and a control circuit that controls the reflection coefficients of the backscatter circuits at different rotational frequencies.

To provide an isolator capable of suppressing the occurrence of a defect.SOLUTION: An isolator according to an embodiment includes a substrate and a plurality of leads. The substrate includes a plurality of coils and a plurality of conductive parts. A lower surface of the substrate has a square shape having first to fourth corner parts in a plan view seen along a first direction. The coils include a first coil and a second coil facing the first coil. The conductive parts include first to fourth conductive parts. The first to fourth conductive parts include first to fourth terminal parts existing at first to fourth opening parts provided in the first to fourth corner parts. The leads include first to fourth leads connected to the first to fourth terminal parts by solder. The leads include metal.SELECTED DRAWING: Figure 1

To prevent a reduction in SN ratio due to mixing of noise when wireless communication is performed between a first transmission line coupler and a second transmission line coupler shorter than the opposing first transmission line coupler.SOLUTION: A wireless transmission system has: a first transmission line coupler 101 that is a pair of signal lines for transmitting differential signals, in which a receiving unit is connected to one end of each of the signal lines and a terminating resistance is connected to the other end; a second transmission line coupler 111 that is shorter than the first transmission line coupler, and opposes to the first transmission line coupler in a non-contact state to communicate electric signals with the first transmission line coupler by using electric field and / or magnetic field coupling. The wireless transmission system includes a ground 106 that, when noise is mixed in the first transmission line coupler, covers at least part of a portion of the first transmission line coupler not opposing to the second transmission line coupler.SELECTED DRAWING: Figure 1