A touch electronic device and method are provided. In one implementation, a touch electronic device includes a wireless transmission module, utilized to receive a data request information transmitted by a first external electronic device, and to transmit an identification information to the first external electronic device to execute identification of the touch electronic device. The electronic device further includes a touch panel, utilized to display a normal interface and an interface pattern, or only display the normal interface. Further, the electronic device includes a touch link module, utilized to develop a touch link between the touch electronic device and a second external electronic device through the touch panel after the wireless transmission module receives the data request information and the normal interface is not used, and to receive the identification information transmitted by the second external electronic device through the touch link.

There is described a method of checking whether a transponder device (220) is in proximity of a reader device (210), the method comprising (a) transmitting a first command (331) from the reader device to the transponder device, (b) in response to receiving the first command at the transponder device, transmitting a first response (332) to the reader device, the first response including an expected transponder device response time (pubRespTime) which is stored in a memory (224) of the transponder device, (c) transmitting a second command (333) from the reader device to the transponder device, (d) in response to receiving the second command at the transponder device, transmitting a second response (334) to the reader device, (e) at the reader device, determining the transponder device response time as the difference in time between transmitting the second command and receiving the second response from the transponder device, and (f) determining whether the determined transponder device response time matches the expected transponder device response time included in the first response. There is also described a reader device (210), a transponder device (220), and a contactless communication system (200).

High resolution tuning of the phase for active load modulation (ALM) in a near field communication (NFC) system is desirable for optimizing the load modulation amplitude. The present disclosure describes that, in one embodiment, high resolution tuning of the phase can be achieved by adjusting the attenuation factor of a radio frequency (RF) attenuator in the NFC system.

A transmission apparatus for a wireless device, comprising: an antenna for receiving an original signal and for backscattering a modulated signal containing information from the wireless device; a variable impedance coupled to the antenna, the variable impedance having an impedance value; a delta-sigma modulator coupled to the variable impedance for modulating the impedance value, and thereby a backscattering coefficient for the antenna, in accordance with the information to generate the modulated signal; and, a decoder coupled to the delta-sigma modulator for generating the impedance value from the information.

A near field communication (hereinafter, referred to as “NFC”) antenna matching network system connected to an NFC transceiver is provided. The NFC antenna matching network system includes a matching circuit connected to first and second antenna terminals and to the NFC transceiver; and a plurality of NFC antennas connected in parallel and physically with the first and second antenna terminals, wherein each of the NFC antennas comprises a source coil connected between the first antenna terminal and the second antenna terminal; and a resonance coil physically separated from the source coil.

A hybrid high-security document includes a document and one or more independent light-emitting modules disposed on or embedded in the document. Each module comprises an antenna with multiple turns, an electronic circuit, and a light emitter mounted and electrically connected on a substrate separate from the document. The electronic circuit is responsive to electrical power provided from the antenna to control the light emitter to emit light. The electronic circuit can include a memory storing information relevant to the hybrid high-security document or its use. The information can be accessed by external readers providing electromagnetic energy to the hybrid high-security document. The hybrid high-security document can be a hybrid banknote.

A communications system configured to execute data transmission between a transponder having no radio wave generating source thereof and a reader/writer is provided. The communications system includes, a service permission level notifier configured to tell a service permission level for associated with a received signal level for permitting service acceptance from the reader/writer to the transponder, and an access controller configured to determine in the transponder whether the received signal level from the reader/writer is at the notified service permission level to determine accessibility to the transponder from the reader/writer.

An NFC device may include a first and second controller interfaces, a first communication channel coupled to the first controller interface, and a second communication channel connected to the second controller interface. A secure element may include a secure element interface connected to the first communication channel and encryption/decryption circuitry configured to encrypt data to be sent on the first communication channel for being framed into the encrypted frames and to decrypt encrypted data extracted from the encrypted frames and received from the first communication channel. The secure element may also include management circuitry configured to control the encryption/decryption circuitry for managing the encrypted communication with the NFC controller. A device host may include a host device interface coupled to the second controller interface and control means or circuitry configured to control the management circuitry through non-encrypted commands exchanged on the first and second communication channels.

According to an embodiment, an electronic device may include: a housing including a first surface and a second surface facing away from the first surface; a display at least partially accommodated in the housing and viewable through the first surface; a conductive layer disposed between the display and the second surface and including a first opening; a support disposed between the second surface and the conductive layer and including a conductive portion; and a wireless communication circuit electrically connected to the conductive layer, and configured to transmit and/or receive a signal through an antenna including at least a portion of the conductive layer surrounding the first opening.

A first device in accordance with an example is placed in a predefined mode in response to removing a near field communication (NFC) tag from an NFC component of the first device. A request is received from a second device to establish a connection with the first device based on data stored on the NFC tag. The first device establishes the connection with the second device and executes the predefined mode.