In an IC tag issuing apparatus including a plurality of row antenna units arranged by facing the IC tags in multiple rows aligned as an IC tag continuous body in each row, respectively, and conducting communication in an electromagnetic induction method with each of the IC tags of the IC tag continuous body by using a plurality of the row antenna units, a plurality of the row antenna units are arranged in a row direction or in a direction along a conveyance direction of the IC tag continuous body, and each of the row antenna units is electromagnetically shielded except the position faced with the IC tags of the IC tag continuous body (by a shield plate and an antenna case).

The present invention discloses a method for predicting a tag arrival rate of a mobile Radio Frequency Identification (RFID) system. The method includes: first, establishing a dynamic tag arrival model for a mobile RFID system based on modeling data and a grey model GM(1, 1); improving a weight of an initial value of a differential equation of the grey model through weighting; and predicating a tag arrival rate based on a sliding window mechanism. A weighted grey model predication algorithm based on the sliding window mechanism can be obtained, to predicate a tag arrival rate of a mobile RFID system. The method for predicting the tag arrival rate of the mobile RFID system of the present invention can reduce a prediction error rate of the system, maintain a modeling length of 4 for the system through the sliding window mechanism, and update modeling data online.

A method for detecting receivers includes a step of detecting a receiver, in which step a general controller detects an adjustable receiver when a general antenna receives a secondary wave emitted by the adjustable receiver, followed by a reconfiguration step in which the general controller commands a controller of the detected adjustable receiver to switch to an interaction mode in which the impedance of the adjustable receiver is alternated between a first configuration impedance and a second configuration impedance in order to detect other receivers. The reconfiguration step is of a duration that is an order of magnitude higher than the duration of each alternation of the first and second configuration impedances.

A wireless tag communication device includes an antenna configured to transmit a carrier wave and receive a response wave output from a wireless tag with respect to the carrier wave and to specify a position of the wireless tag to be searched based on a radio wave intensity of the response wave received by the antenna. The device includes: a radio wave controller configured to switch the carrier wave between a first and second carrier wave to be transmitted in a first and second polarization direction respectively; and a comparator configured to compare a first and second radio wave intensity of a first and second response wave respectively output from the wireless tag with respect to the first and second carrier waves respectively, and the radio wave controller switches the carrier wave between the first carrier wave and the second carrier wave based on a comparison result of the comparator.

Embodiments of this application disclose an NFC-based communication method, an apparatus, and a system. In the NFC-based communication method, an electronic device works in an NFC reader/writer mode and performs an NFC communication process with an NFC tag. When failing to perform the NFC communication process, the electronic device may adjust a currently used radio frequency parameter, and re-perform the NFC communication process with the NFC tag by using an adjusted radio frequency parameter.

A method for collision avoidance in a multi-reader environment comprising a plurality of Radio Frequency Identification (RFID) interrogators, the method comprises each of the plurality of interrogators entering a quiet state during which none of the interrogators transmits, each of the plurality of interrogators selecting a transmit time after the quiet period during which each of the interrogator will attempt to transmit, each of the plurality of interrogators monitoring their associated receive path, an interrogator of the plurality of interrogators transmitting an instruction during its selected transmit time indicating the beginning of a session when the interrogator does not detect data on its receive path prior to its select transmit time, the interrogator comparing its receive path to its transmit path when it transmits the instruction, the interrogator returning to the quiet state when the receive path does not match the transmit path, and the interrogator completing the session when the receive path matches the transmit path.

According to one embodiment, a wireless tag communication device includes a controller configured to acquire, from a wireless tag on a sheet, position information indicating a position of the wireless tag on the sheet, identify the position of the wireless tag on the sheet from the acquired position information, and write information to the wireless tag according to the identified position of the wireless tag on the sheet.

Systems and methods are provided for better reading large populations of RFID tags. Such systems include an RFID reader and a plurality of RFID tags, each having an antenna and an associated RFID chip. Each chip includes an auto-tune circuit and is programmed to confirm the occurrence of a preselected condition. Upon such confirmation, the RFID chip modifies the functionality of the auto-tune circuit to reduce the effects of proximity coupling within the population. The preselected condition may be the tag being read by the RFID reader or the elapse of a preselected amount of time since a power-on-reset of the chip or some other event. The modification to the functionality of the auto-tune circuit may be the disabling of the auto-tune circuit or the changing of the impedance value of the chip or a decrease in the power supplied to the chip or some other modification.

A method for streaming sensor data from a set of radio-frequency identification (RFID) tags includes determining an initial communication approach to be performed with respect to each RFID tag. The method also includes managing access to the RFID tag by refining the initial communication approach based on records of successes and failures of the initial communication approach. A radio-frequency identification (RFID) system is also disclosed, the system comprising one or more processors and a memory system comprising one or more non-transitory computer-readable media storing instructions that, when executed by at least one of the one or more processors, causes the system to perform operations for streaming sensor data from one or more RFID tags to one or more RFID readers.

A backscatter communication method and apparatus provides operation including: receiving a first excitation signal from a first device; determining a first resource based on a candidate resource; and sending a backscattered signal of the first excitation signal to a second device based on the first resource. This can reduce a probability of selecting a same resource as another device to some extent, so that a conflict is reduced, and an access success rate of a backscatter device can be improved.