A mobile device includes a smartcard controller that does not rely on power received from an interrogating RF field. The mobile device also includes a small inductive device capable of inductive coupling with an RFID reader. The smartcard controller includes circuitry to modulate an impedance of a port coupled to the inductive element when in the presence of an interrogating RF field at substantially 13.56 MHz.

The present description concerns an electronic device having an antenna configured to receive a radio frequency signal. The electronic device further includes a control unit. The control unit is off, and the antenna receives a radio frequency signal. The antenna is configured to deliver a first voltage representative of the radio frequency signal to power the control unit with the voltage for the duration of the booting of the control unit.

A method of controlling an electronic device including a memory and a removable smart card. The method involves the device sending a request for context data to the smart card. The smart card sends context data to the device in response to the request and stores this data in the memory and power to the smart card is reduced. Power to the smart card is then increased or restored, and the data is written back to the smart card.

A method for wirelessly receiving and transmitting electromagnetic radiation and to an electronic device thereof, the method including the steps of, wirelessly receiving a first electromagnetic radiation, and storing energy of the received first electromagnetic radiation in an energy storage. Determining, from the amount of energy stored, whether energy stored in the energy storage should be provided to a demodulator and a comparator and/or to a modulator and a transmitter such that they are switched. Demodulating the second electromagnetic radiation so that a first signal is generated. Comparing the first signal with a set of signals. Wirelessly receiving a third electromagnetic radiation. Modulating the third electromagnetic radiation into a fourth electromagnetic radiation by using two different modulations, thereby modifying data contained in the third electromagnetic radiation, and wirelessly transmitting the fourth electromagnetic radiation.

A wirelessly locatable tag may be configured to transmit a wireless signal to an electronic device to facilitate localization of the wirelessly locatable tag by the electronic device. The wirelessly locatable tag may include an antenna assembly comprising an antenna frame defining a top surface and a peripheral side surface and an antenna positioned along the peripheral side surface and configured to transmit the wireless signal. The wirelessly locatable tag may further include a frame member coupled to the antenna assembly and defining a battery cavity configured to receive a button cell battery and an enclosure enclosing the antenna assembly and the frame member. The enclosure may include a first housing member formed from a unitary polymer structure and defining a top wall defining an entirety of a top exterior surface of the wirelessly locatable tag.

A display method of an electronic identification device, a controller, an electronic identification device and a system are provided. The display method includes: controlling the electronic identification device to enter a working state from a sleep state, and obtaining to-be-displayed data; power consumption corresponding to the electronic identification device in the sleep state being lower than power consumption corresponding to the electronic identification device in the working state; and refreshing the to-be-displayed data to an electronic ink screen for display through a serial peripheral interface bus, and controlling the electronic identification device to enter the sleep state again after the refreshing is completed.

This disclosure is generally directed to an RFID system that includes a hybrid RFID tag offering a functionality of a passive RFID tag and an active RFID tag. When operating as a passive RFID tag, an RF signal received from an RFID reader is harvested to produce a DC voltage for powering the hybrid RFID tag. The harvested DC voltage is coupled into a capacitor at a slow-charging rate so as to avoid a capacitor inrush current causing an abrupt power supply voltage drop. A controller chip in the hybrid RFID tag can execute some RFID functions at this time, thereby speeding up a response to the RFID reader. The capacitor is then charged at a fast-charging rate for storing a reserve charge. The hybrid RFID tag can subsequently use the reserve charge to operate as an active RFID tag without waiting for an RF signal from the RFID reader.

A first element and a second element of a same device communicate with each other. The first element sends the second element a first piece of information representative of energy supplied by an electromagnetic field supplying power the device. The second element adapts its operating frequency as a function of the first piece of information.

Embodiments disclosed generally relate to a wireless identification tag with a response time that varies as a function of incoming signal frequency and system and methods for use thereof. In one implementation, the tag may include at least one antenna tuned to receive energy transmitted at a first frequency and at a second frequency. The tag may also include at least one transmitter. The tag may also include at least one circuit configured to detect whether energy is received in the first frequency or the second frequency, and to cause the at least one transmitter to transmit an immediate response when the second frequency is detected and to transmit a delayed response when the first frequency is detected.

An RFID tag includes an RFID IC, a functional module, a case and a window member. The case has a recess and accommodates the RFID IC and the functional module in the recess. The window member is disposed in an opening of the recess. The case has a rib located between the functional module and a side wall of the recess so as to be spaced from the side wall.