31results about "Near-field systems using receivers" patented technology

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 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 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 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 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 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 a wireless tag reader and a program configured to ensure high speed and accuracy in reading a large number of wireless tags.SOLUTION: An RFID tag reader (wireless tag reader) includes: a first read unit (first read means) for reading information held by an RFID tag (wireless tag); a second read unit (second read means) for reading the information held by the RFID tag with higher accuracy than the first read unit; a Q value adjustment unit (adjustment means) for adjusting a Q value related to reading the RFID tag, in accordance with a response status of the RFID tag, when the first read unit or the second read unit is configured to prevent an RFID tag read once from making a response for a predetermined time or longer; and a read method switching unit (switching means) for switching the first read unit and the second read unit to read the RFID tag in accordance with a magnitude relation between the Q value and a switching threshold (threshold).SELECTED DRAWING: Figure 4

To provide a wireless power supply device and a wireless power supply system that have simple configurations and can suppress interference to peripheral apparatuses when power supply radio waves have high power.SOLUTION: A master unit 100 of a wireless power supply system supplies power to a slave unit 200 by a communication / directivity control period and a power supply period that are time-divided with each other, and transmission power of a power supply radio wave during the power supply period is larger than transmission power of a communication signal during a propagation path control period.SELECTED DRAWING: Figure 3

To provide a magnetic communication apparatus and the like that can increase the amount of information transmission without being restricted by skin effect, proximity effect, radiation resistance, or the like, and that can be miniaturized.SOLUTION: A magnetic communication apparatus includes a transmitter 410 and a receiver 420. The transmitter 410 includes a first signal source 411, a second signal source 412, a modulator 414, a power amplifier 416, and a transmitting coil 418. The receiver 420 includes a magnetic sensor 421, a high frequency signal processing circuit 422, a first demodulator 424, a second demodulator 426, and an output controller 428. The magnetic sensor 421 utilizes ferromagnetic resonance for receiving a second modulated wave m2 that has arrived using a magnetic field as a medium, and outputs a signal corresponding to the magnetic field. The output controller 428 visualizes a demodulated original modulated signal (information) and outputs it as sound pressure, light, and / or force or the like.SELECTED DRAWING: Figure 1

To provide a technology for reliable communication during data recovery.SOLUTION: A data transmission device 30 includes an antenna 31 and a communication unit 32. The communication unit 32 modulates the reflected wave of an unmodulated signal received by the antenna 31 and sequentially transmits a plurality of ordered data blocks. When the communication unit 32 has completed the transmission of up to the nth data block, and when the communication unit receives an unmodulated signal in the first standby state waiting for the resumption of reception of the unmodulated signal, the communication unit 32 transmits the data blocks in order from n-nd, where nd is a predetermined value and is also 0 or a natural number.SELECTED DRAWING: Figure 3

To provide a radio receiver capable of removing an arbitrary waveform from a signal waveform in which data are modulated to a signal modulated with the arbitrary waveform when a tag modulates data to various radio waves existing in the air, which makes it possible to eliminate necessity of dedicated transmitter in a system with a dedicated reader for transmitting radio wave to a wireless tag and receiving a response from the tag for reading data from the wireless tag and a dedicated tag which modulates data to an unmodulated signal from the reader when the tag transmits a reply.SOLUTION: An I signal component 30 and a Q signal component 31 which are complex components outputted by orthogonal demodulation of received transmission wave, and an I signal component 37 and a Q signal component 38 which are complex components outputted by orthogonal demodulation of received re-transmission wave are inputted to a complex correlation detection circuit 39, and demodulation data 43 are outputted from a correlation detection output 40.SELECTED DRAWING: Figure 5

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 provide a wireless tag communication apparatus that can guide an operator to an appropriate operation.SOLUTION: According to an embodiment, a wireless tag communication apparatus includes a communication control circuit, a sensor, and a processor. The communication control circuit communicates with a wireless tag via an antenna. The sensor detects a fluctuation amount of an orientation of the antenna. The processor outputs an alert when the fluctuation amount of the orientation of the antenna detected by the sensor is smaller than a reference value.SELECTED DRAWING: Figure 1

To detect an event that a box has been opened, using a mechanism that reads information from an RFID tag, when managing articles accommodated in the box by reading information from the RFID tag.SOLUTION: An article management system has: a box 10 that has an accommodation unit 11 that includes an opening 14 for accommodating an article to which an RFID tag for management is attached, and a lid 15 that openably closes the opening 14; and an RFID reader 40 that radiates radio waves from antennas 30a-30d within the box 10 so as to read information from the RFID tag within the box 10; and an RFID tag 20 for detection that is attached within the box 10. The RFID reader 40 is constituted such that the output of radio waves radiated from the antennas 30a-30d is switchable between a value in which information is readable from all of the RFID tags existing within the box 10, and a value in which information is readable via the antennas 30a-30d from the RFID tags 20 only when the opening 14 is closed by the lid 15.SELECTED DRAWING: Figure 1

The magnetic coil 30 is configured to provide a pulsed signal to a magnetometer 82 in communication with a golf ball 20 used within the golf facility. Multiple coils 30 are provided at different locations around the golf facility, and the pulsed signal is preferably coded to reveal the location of the golf ball.

To provide a urination detection device using an electromagnetic induction method between a passive detection tag including a coil and a capacitor and an antenna.SOLUTION: In an urination detection device that detects an electromagnetic induction coupling resonance state or non-resonance state by a detection tag 2 placed in a diaper and an antenna coil band wound around a diaper user in the vicinity of the detection tag, the detection tag forms a resonant circuit by a capacitor configured by sandwiching a dielectric substrate 51 between a pair of electrodes (front electrode 42 and back electrode 43), and a tag coil connected to the capacitor. The antenna coil band detects urination from the capacitance of the capacitor, which changes as the urination water permeates the urination absorber of the diaper.SELECTED DRAWING: Figure 5

A wireless power receiving device according to one embodiment of the present specification includes a power pickup circuit that receives wireless power from a wireless power transmitting device, and a communication / control circuit that communicates with the wireless power transmitting device to control the wireless power, and the communication / control circuit can exchange application level messages with the wireless power transmitting device using a data transmission stream including an auxiliary data control (ADC) packet and a plurality of consecutive auxiliary data transmission (ADT) packets, and transmits a data packet including information regarding the maximum size of the ADT packet to the wireless power transmitting device.

To realize low power consumption and suppression of unnecessary radiation.SOLUTION: In a communication device that communicates a baseband signal contactlessly with another communication device, the baseband signal is a signal in which a known pattern is inserted during an idle period between the communication device and the other communication device, and the communication device includes a transmission unit that stops outputting a transmission signal for transmission to the other communication device during a period in which the reception strength of a received signal received from the other communication device is less than a first threshold.SELECTED DRAWING: Figure 3

To provide a power transmitting device, power receiving device, control method, and program capable of appropriate wireless power transmission control when communication of the wireless power transmission control is performed using an antenna different from an antenna used for wireless power transmission.SOLUTION: In a wireless power transmission system including a power transmitting device and a power receiving device, a power receiving device 102 includes: a power receiving unit 303 that wirelessly receives power from the power transmitting device via a power receiving antenna 305; a second communication unit 307 that communicates with the power transmitting device using a communication signal capable of storing a plurality of control packets that control wireless power transmission via an antenna different from the power receiving antenna; and a control unit 301 that does not limit the number of control packets of a type different from a specific type stored in the communication signal to one or less, and limits the number of control packets of the specific type stored in the communication signal to one or less.SELECTED DRAWING: Figure 3

To provide an isolator that can improve dielectric strength.SOLUTION: An isolator according to an embodiment includes a first wiring board 31 and a second wiring board 32. The first wiring board 31 includes an insulating layer 53 having a first main surface and a second main surface opposite to the first main surface, a first coil 311 provided on the first main surface, and a pad 312a provided on the first main surface and electrically connected to the first coil 311. The second wiring board 32 includes an insulating layer 63 having a third main surface and a fourth main surface opposite to the third main surface, a second coil 321 provided on the third main surface, and a pad 322a that is provided on the fourth main surface, and electrically connected to the second coil 321. The first coil 311 and the second coil 321 are arranged to face each other, and the outer size of the second wiring board 32 is smaller than the outer size of the first wiring board 31.SELECTED DRAWING: Figure 4

To provide a management system and a wireless tag assembly which allow for recognizing a change in the number of products with respect to each wireless tag.SOLUTION: A management system A1 comprises a controller Ct, a plurality of light devices L, and a plurality of wireless tags Wt each of which is disposed on a shelf Sb on which a plurality of products are piled. The controller Ct and the plurality of light devices L constitute a first wireless communication network Cn1 using a first radio wave. Each light device L outputs a second radio wave, and each wireless tag Wt uses power obtained by power generation at the time of receiving the second radio wave to transmit a first radio wave or a third radio wave, The controller Ct transmits measurement data based on an intensity of the first radio wave or the third radio wave received by the light device L, to an external cloud CL as commodity state data of the wireless tag Wt correlating with the number of piled products Gd.SELECTED DRAWING: Figure 1

To improve the performance of a semiconductor device.SOLUTION: A semiconductor chip CHP3 is provided, having a transformer for non-contact communication between different potentials. This semiconductor chip CHP3 comprises a p-type semiconductor substrate SUB3, a p-type semiconductor region PR1 formed on the surface of the semiconductor substrate SUB3, and a transformer provided above the semiconductor substrate SUB3. The transformer includes: a lower layer inductor 300; a lead wiring portion electrically connected to the lower layer inductor 300; and an upper layer inductor 100 magnetically coupled with the lower layer inductor 300. The lead wiring portion has wiring 10a opposed to the p-type semiconductor region PR1.SELECTED DRAWING: Figure 11

To provide a non-contact data receiving / transmitting body configured to suppress reduction in communication performance, and a method of manufacturing the non-contact data receiving / transmitting body.SOLUTION: A non-contact data receiving / transmitting body 10 includes an inlet 2, a conductive layer body 4 having conductivity, and a bonding layer 3. The inlet 2 includes a substrate 20, an IC chip 21, and an antenna electrically connected to the IC chip 21. The conductive layer body 4 has conductivity. The bonding layer 3 is arranged between the inlet 2 and the conductive layer body 4 to bond the inlet 2 and the conductive layer body 4. The bonding layer 3 contains at least one of a non-polar olefin resin and a non-polar synthetic rubber resin. A thickness of the bonding layer 3 is equal to or larger than 200 μm. The IC chip 21 protrudes from one surface of the substrate 20 and embedded in the bonding layer 3.SELECTED DRAWING: Figure 1

The present disclosure relates to a method for transmitting data packet information, wherein the method is performed by a wireless power transmitter in a wireless power transmission system, and comprises the steps of: entering a power transfer phase; receiving a plurality of control error (CE) packets from a wireless power receiver during the power transfer phase; determining the intervals between the plurality of CE packets; and transmitting the data packet information to the wireless power receiver during the power transfer phase on the basis of the intervals, wherein the length of the data packet information is determined on the basis of the length of the intervals.

A semiconductor chip (1a) including a processor (10a), a coil (70a) for performing wireless communication with another semiconductor chip (1b), a positive electrode power supply terminal (62a), and a negative electrode power supply terminal (61a). In a material including a positive electrode power supply area (52) and a negative electrode power supply area (51), the positive electrode power supply area (52) is bonded or abutted against the positive electrode power supply terminal (62a), the negative electrode power supply area (51) is bonded or abutted against the negative electrode power supply terminal (61a), and an area size of at least one of the positive electrode power supply area (52) and the negative electrode power supply area (51) is wider than an area size of an end part of at least one of the positive electrode power supply terminal (62a) and the negative electrode power supply terminal (61a).

To solve the problem that a sensing device needs to be connected in addition to an information processing device to detect a state amount.SOLUTION: An information processing device comprises at least a first chip and a second chip. The first chip includes a first transmission control section that generates a transmission signal and a first transmission coil that is connected to the first transmission control section and transmits the transmission signal. The second chip includes a second reception coil that can receive the transmission signal by performing inductive coupling with the first transmission coil and a second detection section that detects a voltage or a current applied to the second reception coil. The first chip and the second chip are positioned in proximity to be capable of wirelessly communicating with each other through inductive coupling, and the second detection section detects a change in relative positions of the first chip and the second chip, vibrations applied to the first and second chips, a pressure change, a temperature change, or an electromagnetic wave when a change in the voltage or the current generated in the second reception coil satisfies a predetermined condition.SELECTED DRAWING: Figure 1

A transmission circuit includes a plurality of impedance circuits, each of which has a different impedance, a plurality of switch elements, any one of which is being connected to a respective one of the plurality of impedance circuits, a compensation circuit connected to a respective one of the plurality of switch elements and selectively adding a capacitance value and a resistance value to the transmission circuit, and a control circuit controlling opening / closing of the plurality of switch elements. The control circuit is controllable to selectively change the opening / closing of the plurality of switch elements and to rotate a reflection coefficient of an output terminal on an antenna side in a complex plane.

To construct an inexpensive system that supplies electricity to an RFID tag reader.SOLUTION: An RFID tag system includes an RFID tag reader, and an environmental power generation unit which supplies electricity to an RFID tag reader.SELECTED DRAWING: Figure 4