Abstract: A control/monitor signal transmission system in which simple communication control can be performed without a control unit, and a wiring allowable distance is larger than a conventional system. A plurality of slave stations which are installed corresponding to the plurality of actuating apparatuses and are connected through a common data signal line, and a mediation station which is connected to the data signal line are equipped, and the data signal line includes a plurality of independent groups which are consolidated to the mediation station. The plurality of actuating apparatuses are divided into one or plural sets including at least two, and the actuating apparatuses which belong to the same set and are different in group of the connected data signal line have a correspondence relationship.

Abstract: Embodiments include methods and apparatus for detecting proximity of an electronic article surveillance (EAS) tag. A proximity detection system (e.g., a radio frequency identification (RFID) tag reader) detects a presence of an object within a first area. In response to detecting the proximity of the object, an EAS tag reader alters characteristics of an EAS tag detection signal that is produced by the EAS tag reader in order to detect an EAS tag within range of the EAS tag reader.

Abstract: A method and apparatus involve a radio frequency identification tag that receives a wireless signal containing a message type conforming to an extension of a standard communication protocol and having an extended services segment, the tag then transmitting the extended services segment through an extended services interface. According to a different aspect, a method and apparatus involve a radio frequency identification tag that stores data which includes respective information regarding each of multiple extended services, and that responds to receipt of a wireless signal which is an extension to a standard protocol by transmitting a further wireless signal which is an extension to the protocol and contains at least part of the data. According to yet another aspect, a method and apparatus involve a radio frequency identification tag that responds to receipt of one wireless signal by transmitting a further wireless signal containing information regarding multiple sensors.

Abstract: RFID reader systems, readers, components, software and methods cause RFID tags to backscatter a combination made from at least portions of a first code and a second code, without transmitting any commands in the interim. The first and/or second codes may include a tag response to a reader challenge. In a number of embodiments, a separate command does not have to be sent for reading the second code along with the first code, thereby saving time in inventorying the tags. Plus, the combination can enable reading tag codes during tag manufacturing that are not otherwise readily available to read in the field. In some embodiments, the combination may further include one or more error-checking codes.

Abstract: The present invention provides a method and system for verifying and tracking identification information. In an embodiment of the invention, a system for delivering security solutions is provided that includes at least one of the following: a radio frequency (RF) identification device, an identification mechanism (e.g., a card, sticker), and an RF reader.

Abstract: A solution for managing information using an identification tag is provided. For example, information relating to an item and/or one or more transfers of the item can be managed using an identification tag associated with the item. The identification tag can store and transmit an item identifier, such as an electronic product code (EPC), corresponding to the item, which can be obtained and stored in a data store. Access information for retrieving the item identifier and identification information for a party to the transfer can be used to generate a custom identifier that can be provided for storage on the identification tag in place of the item identifier. The custom identifier can subsequently be used to acquire information on the item and/or the transfer event.

Abstract: A system and method are disclosed for transporting deterministic traffic in a gigabit passive optical network. A system that incorporates teachings of the present disclosure may include, for example, an Optical Line Termination (OLT) for exchanging data traffic in a Gigabit Passive Optical Network (GPON) having a controller programmed to generate a timeslot schedule for transport of a desired bandwidth of constant bit rate (CBR) data traffic by selecting one or more timeslots from periodic frame clusters operating according to a GPON Transmission Convergence (GTC) protocol. Additional embodiments are disclosed.

Abstract: Systems for identifying and categorizing distributed devices, e.g., lighting fixtures and thermostats, is disclosed. In an embodiment, a user (200) sends a low power discovery message to devices (201) using a portable programming tool (100). The devices (201) within range respond with identification information. The portable programming tool (100) organizes the responses by proximity and sends a “flash” message to the device with the closest perceived proximity. That device responds with a visual or audible signal (202), allowing the user (200) to determine whether that device is the one intended for selection. If so, the user initiates a store routine in which identification information, including category information, is stored in one or more locations, such as, the selected device (201), the portable programming tool (100), and/or a central or local controller (1100). The identification and categorization can, for example, be used to automate load shedding and to reduce energy consumption.

Abstract: In order to further develop a system (100) as well as a method for protecting at least one item to be secured, for example at least one piece of luggage, the system comprising at least one transponder device (50), in particular at least one electronic tag, being assigned to the item, and at least one monitor device (10, 20), in particular being based on short range radio frequency communication, with at least one transmitting unit (18, 28) for transmitting and/or for broadcasting and/or for multicasting, in particular periodically, at least one request (40, 42) to the transponder device (50), in such way that the monitor device (10, 20) can be carried with him by at least one user and that at the same time it can be discovered whether the item remains nearby the respective monitor device (10, 20), it is proposed that the transponder device (50) comprises at least one processing unit (52) for determining the number (N) of monitor devices (10, 20) being arranged within the range, in particular within the receiv

Abstract: There is provided a mobile terminal device designed to perform wireless communication with an RFID tag being held over the device by using electromagnetic waves. The device includes a plurality of antennae arranged in or in vicinity to a display area of the mobile terminal device, and a control unit configured to detect a part of the display area, which is not covered with the RFID tag, from electromagnetic wave intensities acquired by the plurality of antennae and to display information for a user in the detected part of the display area.

Abstract: A system and method for alerting operators of mobile equipment to the presence of people in monitored areas around the periphery of the mobile equipment they are operating is provided. The system includes an RFID detection system which is installed on the mobile equipment and alerts the operator to the presence of people wearing Personal Protection Equipment containing RFID safety tags. The system also includes a tag programming system which allows RFID safety tags to be created. The system also includes a tag testing system which allows a person to test the functionality of the RFID safety tags contained in the personal safety equipment they are wearing. The system also includes RFID personal safety equipment such as 3D safety vests and RFID hardhats which contains RFID safety tags. The 3D safety vests also include enhanced 3D visual markings.

Abstract: An RFID aggregate storage stores a radio-frequency ID aggregate structure. The RFID aggregate structure is an aggregated data structure of a plurality of RFIDs, in which each RFID is associated with a location and time read out from a RFID tag, and RFID related information, hierarchically constructed by classifying RFIDs based on the readout location and further by classifying them based on the readout time. A proximity evaluator evaluates the proximity between the first user's RF ID aggregate and the second user's RFID aggregate. A user classifier classifies the first user and the second user in one group when the proximity is smaller than a predetermined threshold value.

Abstract: A process for monitoring containers including use of a severable security lock with an radio frequency identification (RFID) antenna adapted sever upon dislocation of the lock. The process utilizes an electronic identification number to ensure security lock integrity. The process includes detecting the security lock in transit by the use of mobile and fixed transmission units at regional boundaries. Updates are provided to an event log associated with the security lock.

Abstract: Microstrip patch antenna (46), feed structure (48), and matching circuit (50) designs for an RFID tag (10). A balanced feed design using balanced feeds coupled by a shorting stub (56) to create a virtual short between the two feeds so as to eliminate the need for physically connecting the substrate to the ground plane. A dual feed structure design using a four-terminal IC can be connected to two antennas (46a,46b) resonating at different frequencies so as to provide directional and polarization diversity. A combined near-field/far-field design using a microstrip antenna providing electromagnetic coupling for far-field operation, and a looping matching circuit providing inductive coupling for near-field operation. A dual-antenna design using first and second microstrip antennas providing directional diversity when affixed to a cylindrical or conical object, and a protective superstrate (66). An annular antenna (46c) design for application to the top of a metal cylinder around a stem.

Abstract: Embodiments of the present invention include systems and methods for providing Quality of service to RFID. In one embodiment the present invention includes a method of providing quality of service in an RFID network comprising storing RFID priority information corresponding to the RFID network, wherein the RFID network comprises one or more tags and one or more readers mapping the RFID priority information into priority information corresponding to a second network.

Abstract: The invention concerns a contactless portable object (10, 30, 60) featuring a main radiofrequency device made up of a main chip (18, 38, 68) and a main antenna (16, 36, 66) connected together so that, when the portable object enters the magnetic field of a suitable reader, the main radiofrequency device provides power to the chip and ensures communication between the chip and the reader. According to the main characteristic of the invention, the portable object includes a secondary contactless device featuring a secondary antenna (12, 32, 62) and an electric circuit set up in such a way that, when the two antennas enter the magnetic field of a suitable reader at the same time, the amount of energy required to power the electric circuit and have it operational being less than the amount of energy required to power the main chip (18, 38, 68) and have it operational, the electric circuit is powered and makes the reading of data of the main chip impossible.

Abstract: Tightly-coupled near-field transmitter/receiver pairs are deployed such that the transmitter is disposed at a terminal portion of a first conduction path, the receiver is disposed at a terminal portion of a second conduction path, the transmitter and receiver are disposed in close proximity to each other, and the first conduction path and the second conduction path are discontiguous with respect to each other. In some embodiments of the present invention, close proximity refers to the transmitter antenna and the receiver antenna being spaced apart by a distance such that, at wavelengths of the transmitter carrier frequency, near-field coupling is obtained. In some embodiments, the transmitter and receiver are disposed on separate substrates that are moveable relative to each other. In alternative embodiments, the transmitter and receiver are disposed on the same substrate.

Abstract: A radio frequency identification (RFID) tag is coupled to a circuit board to track the specific operating and environmental conditions of each stage as the circuit board passes through one or more manufacturing and/or post-manufacturing stages. An RFID reader and data collector are used at each stage to read the RFID tag and store its identifying information along with processing information, operating conditions, and results for each stage. This permits to quickly and accurately collect manufacturing and post-manufacturing information for each circuit board at various stages as well as the operating conditions for each stage at a particular time. Such manufacturing and/or post-manufacturing metrics can then be retrieved on a stage-by-stage basis for a particular circuit board by an identifier associated with the circuit board.

Abstract: The present invention is directed to an interrogator, method of discerning metal and radio frequency identification (RFID) objects, and an interrogation system employing the same. In one embodiment, the interrogator includes a metal sensing subsystem configured to provide a first signal having a signature representing a presence of a metal object, and a RFID sensing subsystem configured to provide a second signal having a signature representing a presence of a RFID object. The interrogator also includes a control and processing subsystem configured to discern a presence of at least one of the metal and RFID objects from one of the first and second signals.

Abstract: A method for entering information regarding monitored items into a database in a security tag system includes reading barcode item information from a barcode associated with a monitored item, determining whether a tag is present with the monitored item to provide tag presence information, and storing the barcode item information and the tag presence information into the database. The barcode item information and the tag presence information are associated with each other in the database to provide item association information. A rule regarding whether a tag should be present when the barcode associated with the monitored item is read is determined in accordance with the item association information and the tag is deactivated in accordance with the rule. An alarm condition is raised in accordance with the rule. The alarm condition is raised if the tag is present and the rule indicates that the tag should not be present.

Abstract: The invention relates to a warning device for signaling the presence of a radio frequency communication. The system includes an indicator perceptible to a user and an activation circuit to sense or detect energy originating from the communication and to activate the indicator. The device is distinguished in that the indicator is a vibrator. The invention also relates to a radio frequency communication device, such as a chip card, a passport, an insert, a mobile telephone, having the warning system, and a method of fabrication.

Abstract: An RF tag system includes a first reader/writer unit and a second reader/writer unit. A first reader/writer control unit is configured to control the first reader/writer unit to read a first data from a first RF tag, and to detect a trouble state of the first reader/writer unit. A second reader/writer control unit is configured to control the second reader/writer unit to read a second data from a second RF tag, and to detect a trouble state of the second reader/writer unit. A monitoring section is configured to issue a selection instruction and to monitor the first reader/writer unit through the first reader/writer control unit, and the second reader/writer unit through the second reader/writer control unit. A switching section is configured to select one of the first reader/writer control unit and the second reader/writer control unit in response to the selection instruction from the monitoring section.

Abstract: A high-speed machine and method for placing an RFID circuit onto an electrical component includes separating an RFID circuit from a web of RFID circuits, and placing the RFID circuit onto an electrical component with a placing device. The separating includes directing the RFID circuit onto a transfer drum of the placement device and separably coupling the RFID circuit to the transfer drum. According to one method, a separator device separates and directs chips or interposers onto a placement device. According to another method, chips or interposers are tested before being separated from a web, and if good, are separated from the web, directed onto a placement device, and placed on an electrical component. If defective, the chips or interposers are not directed onto a placement device and are removed by a scrap web removal device.

Abstract: The electronic module (18) for an electronic device (10) such as a microcircuit card, comprises a substrate (20) delimiting first (20A) and second (20B) opposite faces. More particularly, the module (18) comprises a light source (26) borne by the second face (20B) of the substrate (20) and capable of illuminating a visible part of the electronic device.

Abstract: Methods, systems, and apparatuses for ways of locating tags are described. A power level of a RFID communication signal transmitted by a RFID device, such as a reader, is adjusted to hone in on a specific tag. For example, the power level may be decreased or increased, depending on the situation, to hone in on the tag. The RFID device may be repositioned to aid in further honing in on the tag. Transmitting RFID communication signals, adjusting transmit power levels, and repositioning the RFID device may be iterated as needed to hone in on the tag.

Abstract: An application specific integrated circuit chip includes capacitors and antennas. The antennas receive energy from an outside source, and charge capacitors on the chip in order to provide power to the chip itself. The chip in turn communicates by antenna to outside receivers for the purposes of identification of the chip and hence a bag or article to which it is attached. The chip is attached to its article by means of glue which is in turn applied by an applicator which shoots the chip and the glue against the article.

Abstract: A security tag in accordance with an embodiment of the present invention includes a housing, a membrane operable for attachment to merchandise, wherein the housing is connected the membrane, a monitoring device operable to monitor whether a party removes or attempts to remove the housing from the membrane and an alarm operable to emit a tamper signal when the monitoring device indicates that a party has removed or attempted to remove the housing from the membrane in an unauthorized condition. A security system in accordance with an embodiment of the present invention includes a security tag operable for connection to merchandise to be secured, a monitoring device operable to monitor whether a party removes or attempts to remove the security tag from the merchandise and an alarm operable to emit a tamper alarm signal when the monitoring device indicates that a party has removed or attempted to remove the security tag from the merchandise in an unauthorized condition.

Abstract: The present invention is directed to systems that use frequency selective surfaces (FSS) to aid in the operation of radio frequency identification (RFID) devices and products. In one embodiment, a system for interrogating radio frequency identification (RFID) tags includes a conveyor belt and an RFID reader. The conveyor belt has a first surface and a second surface. The first surface is configured to receive an item to which an RFID tag is affixed and the second surface is configured to slide on a metal slide plate. The RFID reader is configured to transmit instructions embodied in a radio frequency (RF) signal to the RFID tag, wherein the metal slide plate is positioned between the RFID reader and the RFID tag and comprises a frequency selective surface that is substantially transparent to the RF signal.

Abstract: A system for tracking the locations of passengers on a vessel includes a portable tag configured to be assigned to a passenger, the tag encoded with a tag identifier. The system further includes a plurality of tag readers configured to be positioned at predetermined locations on a vessel, each tag reader configured to read the tag identifier of the tag when the tag reader receives a signal from the tag. A tracking component is configured to communicate with the tag readers, the tracking component configured to receive, from a detecting tag reader, an indication that the signal has been received from the tag, the tracking component configured to determine a detected location of the tag based at least in part on the predetermined location of the detecting tag reader.

Abstract: Provided are embodiments of configurable monitoring devices, methods, systems, computer readable storage media and other means for dynamically transitioning the functionality, roles and/or modes of operation of networked devices. In some examples, the dynamic configuration of the configurable monitoring device may be accomplished wirelessly and used to monitor and track the location of retail products as well as thwart theft of the retail products.

Abstract: A method and system for associating a biometric reference template with an identification tag for a physical object. A processor of a computer system ascertains that an attribute included in the identification tag is signed with a digital signature. The attribute includes a privacy policy identifier which identifies a privacy policy pertaining to the identification tag. The identification tag is embedded in or attached to a physical object. The identification tag includes a first biometric reference template identifier that uniquely identifies biometric data pertaining to a person. The biometric reference template includes a second biometric reference template identifier that uniquely identifies the biometric data. The processor confirms that the digital signature matches a signature stored in a database of the computer system. The processor verifies that the first biometric reference template identifier matches the second biometric reference template identifier.

Abstract: A portable consumer device is disclosed. One or more contact regions in the portable consumer device may be provided on the contactless portable consumer device. The user may be required to place a finger on the one or more contact regions while holding the portable consumer device proximate to the interrogation device to enable it to be interrogated. The user's fingers may be used to electrically bridge an open portion of a circuit so as to enable operation of the portable consumer device.

Abstract: A radio frequency identification (RFID) monitoring system (12) for monitoring a plurality of RFID tags, and in particular for monitoring a plurality of vials incorporating such tags and stored at a low temperature, (eg.?80° C.) within a storage unit (10), for example a freezer. The RFID system (12) comprises an RFID reader (28) and at least one antenna (34a-34i) for transmitting and receiving RF signals to communicate with the RFID tags. The system (12) further includes an electronic switch (38), preferably a FET switch, interposed between the RFID reader and the at least one antenna (34a-34i) to connect a particular antenna (34a-34i) to the RFID reader (28) and transmit RF signals from the antenna (34a-34i) to the RFID tags. The switch (38) is controlled to intermittently connect the antenna (34a-34i) to the RFID reader (28) to regulate the power of the RF signal transmitted from the antenna (34a-34i). The system enables an RFID tag to operate at low temperatures.

Abstract: A method and apparatus is provided for initiating procedures whereby a smart device is able to analyze situational data sensed by the device, compare one or more event signatures representative of the sensed data with one or more sets of event signatures in a library of event signatures to logically determine completion of a job function and to then cause a specific action to be taken.

Abstract: A corrosion sensing system includes a reader, a radiation receiving device, a sensing transponder, and a member. The sensing transponder includes a communications device, a processor, and a sensor. The member is subject to corrosion. The sensor is located to detect corrosion of the member. The communications device is connected for transmitting sensor data. The transponder is powered by electricity derived from electromagnetic radiation transmitted by the reader that is received by the radiation receiving device.

Abstract: A RFID tag programmed with a distinct binary code is embedded in an IC and is electrically integrated with the IC so as to establish a communication path between the RFID tag and the IC. An electronic ID for the IC is defined and coordinated to match with the binary code of the tag. The electronic ID is an active ID that is used to communicate the unique identification information of the IC to other wired electronic components.

Abstract: A method, system, and medium are provided for monitoring a location of an object using a mobile device, including emitting from the mobile device a radio frequency (RF) signal that activates a radio frequency identifier tag (“RFID tag”) located within a broadcast area (the RFID tag being affixed to the object); receiving at the mobile device an RF signal generated by the RFID tag; determining that the RFID tag is registered among a set of RFID tags that are to be tracked; determining that the RFID tag is not located within the broadcast area; and emitting by way of the mobile device an alert that indicates that the RFID tag is not located within the broadcast area.

Abstract: A method and apparatus for phase ranging the distance an RFID tag is from an RFID location system antenna along the interrogation signal beam, based upon the phase readings included in data sets obtained from monitoring reply signals corresponding to interrogation signals at multiple frequencies and a common interrogation signal beam direction; by comparison of measured phase and frequency data sets with theoretical phases calculated with respect to the same frequencies over a range of positions corresponding to a beam extent of the interrogation signal.

Abstract: An apparatus, system, and method for judging a movement direction of an RFID tag in a case where read information acquired from a first region and read information acquired in a second region which overlap the first region indicate that the RFID tag has moved out of a part of the first region which part does not overlap the second region. The described embodiments include a movement direction judging section, a detection frequency information acquisition section, a movement judging section, an output judging section, and an output section.

Abstract: A method for producing a proof of the presence and/or of the availability of an entity in a site over a period that is greater than or equal to a presence threshold, the method including: successively transmitting messages, the messages being generated from a secret such that the secret may be reconstituted by having the knowledge of a given number of messages that is greater than or equal to a threshold, each message being transmitted over a transmission period whose duration is chosen such that the product of the duration of the transmission period times the threshold is substantially equal to the presence threshold; comparing the secret and a secret candidate generated from messages received by the entity; the proof being produced only if the secret and the secret candidate are equal.

Abstract: RFID readers transmit a Quiet Technology (QT) command to RFID tags causing at least one of the tags to transition between a private profile and a public profile. When a tag is inventoried in the private profile, it replies to the reader with contents from its private memory. When a tag is inventoried in the public profile, it replies to the reader with contents from its public memory, where the contents of the public memory may be a subset and/or modified version of the private memory contents, or entirely different altogether. The tag's profile can be switched again by another QT command from the reader, or following a loss of power at the tag. An access password and/or a short-range mechanism may be employed to allow only authorized readers to transition tag profiles or interrogate the private memory contents of tags in the public profile.

Abstract: A transportation and storage unit includes a transponder identification unit for distinguishing and identifying goods or other objects, a multiplicity of which may be disposed, transported and/or stored and/or handled on palettes or similar transport aids in so-called groups, bunches, units or bundles. A plurality of mutually-separated transponders are embedded in the transponder identification unit. The transponder identification unit surrounds the periphery of the transportation and storage unit. A reading unit for sensing a multiplicity of transportation and storage units is also provided.

Abstract: Generally, smart sensors, logic to process messages from smart sensors, and smart sensor systems are described herein. Embodiments may comprise logic such as hardware and/or code to communicate events as messages via a messaging system to post the messages to a messaging account. The messaging system may be a texting service like Twitter™ that captures the messages and then re-broadcasts the messages, e.g., immediately as a tweet or a cellular text message. In some embodiments, the smart sensor comprises a communications module with a Twitter™ application program interface (API) on a communications platform with a software/hardware framework to interconnect with one or more pluggable monitors with sensors. In other embodiments, the communications module may be integrated with one or more monitors. Further embodiments comprise a smart-device, which can provide status updates and event notifications to a user.

Abstract: A particular portable radio frequency identification (RFID) reader includes an active antenna array including a plurality of antenna elements to receive RFID signals from RFID devices. The antenna elements include control circuitry to control a beam pattern generated by the active antenna array. The portable RFID reader further includes sum circuitry and difference circuitry. The sum circuitry is operable to determine a sum signal by summing the RFID signals received by at least two of the plurality of antenna elements. The difference circuitry is operable to determine a difference signal between the RFID signals received by at least two of the plurality of antenna elements. The portable RFID reader also includes a controller to electronically steer the beam pattern and to determine a direction from the RFID reader to a particular RFID device.

Abstract: A storage container assembly includes a container having a metal side wall, and a passive wireless repeater mounted on the side wall. The repeater includes a first antenna on one side of the side wall, a second antenna on an opposite side of the side wall, and an electrical connection between the first antenna and the second antenna. The electrical connection may be in the form of a first connector mounted to the first antenna and a second connector mounted to the second antenna.

Abstract: A radio frequency receiver comprises a first signal coupler coupling and branching a radio frequency signal received from a tag or a reader, a voltage regulator receiving the coupled signal and outputting a voltage-regulated signal having a predetermined level, a signal converter mixing the radio frequency signal transmitted from the first signal coupler by using the voltage-regulated signal as an oscillation frequency signal and generating a baseband frequency signal, a signal processor processing the baseband frequency signal and extracting tag information, and a data transceiver transmitting the tag information through a wire and/or wireless network.

Abstract: A combination EAS/RFID antenna for use in an EAS/RFID surveillance system. The antenna includes an EAS antenna element and an RFID antenna element. The EAS antenna element includes an EAS loop antenna defining an interior area. The RFID antenna element is positioned within the interior area defined by the EAS loop antenna and includes a ground plane and RFID patch antenna. The ground plane and/or the RFID patch antenna have a segmented conductor pattern etched thereon. The segmented conductor pattern minimizes eddy currents in the ground plane produced by current flow through EAS loop antenna. The RFID antenna element is situated proximate the EAS loop antenna in such a fashion that the overall size of the antenna is reduced.

Abstract: A method of authentication of a terminal generating a magnetic field, by a transponder including an oscillating circuit from which a D.C. voltage is generated, wherein the transponder: receives first data relative to the current in an oscillating circuit of the terminal, measured by the terminal for a first value of the resistive load of the transponder; and exploits these first data and second data relative to the level of said D.C. voltage, respectively measured for the first resistive load value and for a second resistive load value.

Abstract: Apparatus and methods are described which are useful for determining a location characteristic between an RFID tag and an RFID tag reader or a second RFID tag. In various embodiments, signals backscattered from a singulated tag over a range of frequencies are evaluated for in-phase I and in-quadrature Q signal components. The I-Q data is processed to determine phase delay angles associated with each signal frequency. The phase delay data can be processed by a sum of squared errors method or Fourier transform method to determine a distance to the singulated tag. The methods can also be used to determine any of a location, a radial velocity, a directional velocity of the singulated tag, and proximity of the singulated tag to a second tag.

Abstract: A radio frequency (RF) charging system is capable of charging an RF device on a display panel to increase charging efficiency. The RF device generates a response signal upon receiving an RF signal. The RF charging system includes an antenna set having a plurality of antennas, a switch unit, an RF module and a microcontroller unit (MCU). The MCU controls the switch unit to select one antenna from the antenna set. The antenna is able to receive the response signal and is used for transmitting the RF signal, thereby charging the RF device.