Embodiments of the present disclosure generally relate to a wireless identification tag with varying identity, and system and methods for use thereof. In one implementation, the tag may include at least one transmitter configured to transmit a tag ID. The tag may also include at least one circuit. The at least one circuit may be configured to receive a first trigger at a first time and generate in a quasi-random manner a first decipherable ID uniquely identifying the tag, and cause the at least one transmitter to transmit the first decipherable ID. The at least one circuit may also be configured to receive a second trigger at a second time and generate in a quasi-random manner a second decipherable ID different from the first decipherable ID and uniquely identifying the tag, and cause the at least one transmitter to transmit the second decipherable ID.

Embodiments of the present disclosure generally relate to a wireless identification tag configured to harvest ambient energy and transmit an identification signal intermittently, and system and methods for use thereof. In one implementation, the tag may include a transmitter configured to transmit a first signal to a first receiver in a first frequency, and to transmit a second signal to a second receiver in the first frequency. The tag may also include an energy storage component configured for collecting and storing ambient energy and for powering transmission of the transmitter. The tag may also include a circuit configured to monitor energy stored in the energy storage component, and to prevent the transmitter from transmitting the first signal to the first receiver when the energy stored in the energy storage component is insufficient to transmit the second signal to the second receiver.

Embodiments of the invention employ frequency selective surfaces that resonate at defined frequencies depending on geometry. Tag-based embodiments allow the ability to have passive, battery-free, systems that can be used for applications including but not limited to inventory tracking, locating, and indoor radar (e.g. determining whether something labeled with a tag is in range of a particular wireless network signal). The shape of the resonator, among other available factors, influences the interference frequency. Embodiments may include metal based tags on a non-conductive material that will be used to disturb, for example, frequencies from 3 KHz to 300 GHz. These disturbances at specific resonant frequencies are useable to, for example, locate the tags/labels using WiFi Mapping, sending a WiFi signal and getting unique feedback on a router.

An RFID tag is described with an antenna and a passive reflector. In an example, the RFID tag has a dielectric substrate. A first conductive pattern is on the dielectric substrate to form an antenna. An RFID integrated circuit (IC) chip is on the dielectric substrate having an antenna port electrically coupled to the antenna, the antenna port being configured to provide RF energy from a reader to the RFID IC chip through the antenna, the RFID IC chip being configured to provide a response to the reader through the antenna. A second conductive pattern is on the dielectric substrate beside the antenna in the form of a second dipole to form a passive reflector that is not electrically coupled to the antenna port, the passive reflectors being configured to reflect RF energy from the reader away from the antenna.

A passive tag for communication can include a passive array having an antenna assembly and at least one resonator coupled to the antenna assembly. The passive tag can also include a body that covers the passive array, where the body includes at least one touch point, where each of the at least one touch point corresponds to one of the at least one resonators of the passive array. The body and the passive array can be without a power source and a transistor. The passive array can be configured to receive a first communication signal. The passive array can further be configured to backscatter a second communication signal using the first communication signal.

The present invention relates to a method for producing radio frequency identification devices (RFID) without personalized chip, in particular the production of RFID tags without personalized chip, also referred to as chipless RFID tags. The present invention also relates to devices and labels produced by the claimed method as well as to systems for producing said devices/labels.

An approach for training a system to decode a chipless RFID tag involves varying at least one reading parameter of an interrogation signal and acquiring a test response signal response to each variation of the interrogation signal. One or more simulated response signals are simulated for one or more variations of the reading parameter. A decoding processor is trained to decode the identification (ID) of the RFID tag using the test response signals and the simulated response signals.

A product tagging system is provided that includes at least one RF backscatter transmitter configured to emit a Radio Frequency (RF) signal on a frequency. The system includes a plurality of passive RF backscatter tags, each associated with a respective product and configured to backscatter a reply in response to a transmission from the transmitter. The system includes at least one RF backscatter receiver configured to read data for the respective product by detecting a distributed ambient backscatter signal generated by backscattering the RF signal by a corresponding one of the tags. The at least one RF backscatter receiver includes at least two antennas for performing Simultaneous Multi-Port reception (SMP) by receiving respective distributed ambient backscatter signals from a same one of the tags responsive to a same one of the RF signal being transmitted thereto. Each of the transmitter and receiver include a respective synchronized clock for the SMP.

A product tagging system is provided. The product tagging system includes at least one RF backscatter transmitter configured to emit a Radio Frequency (RF) signal on a frequency. The product tagging system further includes a plurality of passive RF backscatter tags, each associated with a respective product and configured to reflect and frequency shift the RF signal to a respective different frequency. The product tagging system also includes at least one RF backscatter receiver configured to read the respective product on the respective different frequency by detecting a distributed ambient backscatter signal generated by a reflection and frequency shifting of the RF signal by a corresponding one of the plurality of passive RF backscatter tags.

An objective of the present invention is to provide a contactlessly readable tag, method for manufacture of contactlessly readable tag, identification device, and method for reading identifying information, capable of effecting an increased capacity in recorded information and improved precision in reading said recorded information. Provided is a contactlessly readable tag, comprising a metal part and an electromagnetic wave absorption body. The manner in which the metal part and the electromagnetic wave absorption body are installed is associated with identifying information. When the tag is irradiated with electromagnetic waves, it is possible to identify the identifying information on the basis of the amplitude of the electromagnetic waves reflected by the tag, and the shift in either the frequency or the phase of said reflected electromagnetic waves.