52results 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 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 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 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.

Disclosed herein are system, apparatus, article of manufacture, method and / or computer program product embodiments, and / or combinations and sub-combinations thereof, for determining physical possession of one or more IoT devices. According to some embodiments, a method for determining physical possession of a plurality of Internet-of-Things (IoT) devices includes determining physical possession of a first IoT device of the plurality of IoT devices. The method further includes determining whether the first IoT device with the determined physical possession satisfies a condition. In response to determining that the first IoT device with the determined physical possession does not satisfy the condition, determining physical possession of a second IoT device of the plurality of IoT devices. In response to determining that the first IoT device with the determined physical possession satisfies the condition, determining the physical possession of the plurality of IoT devices based on the determined physical possession of the first IoT device.

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 transmitter that has reduced complexity in communication with a receiver, a wide communication range, and good stability.SOLUTION: A transmitter (1; 21) is for wirelessly transmitting an amplitude-modulated data signal (2) in an RF field (3) to a receiver (4) of an RFID communication system (5; 22). The transmitter (1; 21) includes: a wave generator (6) for generating a carrier signal (7) having a specific frequency and waveform; a modulation stage (15) for modulating the carrier signal (7) with a data signal to be transmitted; and an antenna (11) connected to the modulation stage (15) or the wave generator (6) via an amplifier (9) and a matching circuit (10) in order to wirelessly transmit the amplitude-modulated data signal (2) in the RF field (3). The transmitter (1; 21) further includes a shaping stage (16) connected to the wave generator (6) for selecting the waveform of the carrier signal (7) directly or indirectly depending on the data signal.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 reader device that can read out from two types of transponders in a short period of time.SOLUTION: A reader device of an embodiment of the present invention comprises a transmission section, a cancellation section, and a decryption section. The transmission section transmits a wave obtained by modulating a carrier wave with a modulation signal representing a command to be given to a first transponder, as an interrogation wave. The cancellation section cancels modulation components according to the modulation signal from the wave returned from a second transponder different from the first transponder as a response wave, the second transponder being compliant with back scatter communication. The decryption section decodes data represented by the response wave in which the modulation components have been canceled by the cancellation section.SELECTED DRAWING: Figure 1

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

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 power reception apparatus 102 includes a power reception unit 303 configured to wirelessly receive power from a power transmission apparatus 101 via a power reception antenna 305, a communication unit 307 configured to communicate with the power transmission apparatus 101 via an antenna different from the power reception antenna 305, using a communication signal capable of storing a plurality of control packets that controls wireless power transmission, and a control unit 301 configured not to limit the number of control packets of a type different from a particular type to be stored in the communication signal to one or less, and configured to limit the number of control packets of the particular type to be stored in the communication signal to one or less.

A rotating capacitive data link system includes a first body rotatable relative to a second body. The first body has one or multiple circular signal transmission lines with multiple transmission line segments. The second body has multiple circular arranged sets of receiving couplers with multiple receiving couplers. Each of the sets of receiving couplers matches to one of the circular signal transmission lines, such that depending on the relative rotational position or angle between the first body and the second body multiple capacitively coupled paths between the transmission line segments and the receiving couplers of a matching set of receiving couplers exist. A receive signal processor is provided to generate a detailed error or status matrix of transmission errors.

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

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.