The present disclosure provides collaborative radiofrequency identification (RFID) readers that employ code division multiple access (CDMA) encoding to simultaneously broadcast to and read responses from tags in an overlapping reading zone with improved data synchronization and read yield rates. In some embodiments, a harmonic backscattering scheme is used to enable the system to have a much higher signal-to-noise ratio (SNR) and sensitivity, while the reader CDMA protocol can be integrated with an initial TDMA polling process or alternative tag CDMA scheme.

The present disclosure provides collaborative radiofrequency identification (RFID) readers that employ code division multiple access (CDMA) encoding to simultaneously broadcast to and read responses from tags in an overlapping reading zone with improved data synchronization and read yield rates. In some embodiments, a harmonic backscattering scheme is used to enable the system to have a much higher signal-to-noise ratio (SNR) and sensitivity, while the reader CDMA protocol can be integrated with an initial TDMA polling process or alternative tag CDMA scheme.

The present disclosure relates to a method and apparatus for selective communication between a tag and a reader using a filter. According to an embodiment of the present disclosure, a communication method between a tag and a reader using a filter performed by a reader includes generating a filter based on tag information of the tag to collect data, transmitting the generated filter to the tag, and receiving data from a tag that selected through a filtering operation of the transmitted filter.

A tag reader includes a communication controller, a communication interface, and a processor. The communication controller controls an output level of an output signal to be output from an antenna for reading an RFID tag. The communication interface communicates with a host device. The processor specifies a minimum output level of the output signal at which the RFID tag can be read and transmits the minimum output level to the host device through the communication interface.

A compartment in a vehicle can be loaded by an object and an operating device having a user interface configured to output at least one output signal on a part of the user interface. The operating device is designed to cover the compartment. The compartment includes a sensing unit configured to detect the presence of the object when at least a part of the object is loaded into the compartment and the operating device includes control circuitry configured to display a digital image of the object on a part of the user interface.

In some aspects, material processing head can include a body; an antenna disposed within the body; a first tag, associated with a first consumable component, disposed within a flux communication zone of the body at a first distance from the antenna, the first tag having a first resonant frequency; and a second tag, associated with a second consumable component, disposed within the flux communication zone of the body at a second distance from the antenna, the second tag having a second resonant frequency that is different than the first resonant frequency, where the first and second resonant frequencies are tuned based upon at least one of: i) a difference between the first distance and the second distance; or ii) a characteristic (e.g., shape) of the flux communication zone in which the first tag and/or the second tag is disposed.

The disclosure describes an RFID system having chip-based novel Simple Random-Access Procedure (SRAP) and Dynamic Simple Random-Access Procedure (DSRAP) tags, and chip-less time and frequency coded tags, for inventory management. The SRAP process contains static (pre-defined) size Frame Structures, and RFID tags compete for network resources by transmitting random preambles to contend for resources to send its Tag-ID to the RFID Reader. The DSRAP process contains dynamic (changing) size Frame Structures and is more efficient than SRAP if the number of tags is lower. The disclosed memory-based variants, save the orthogonal preambles in the tag's memory to reduce the number of transmitted bits and processing necessary to calculate the preambles. To further improve system efficiency and reduce the number of transmitted bits, disclosed memory-based variants may use a pre-defined memory-based modulation (QAM) signal in the memory of the transmitter of the Tags. The disclosure also presents a frequency and time coded chip-less RFID tag system. Each printed chip-less tag has a unique frequency signature, where each chip-less tag's ID is saved in a table in the main memory of the Reader (look-up-table) or in the middleware database. A variable time-delay is added to some chip-less tags to reuse the frequency signatures for a given frame, allowing millions and billions of products to be uniquely identified within a pre-defined time (˜1 sec).

Systems and methods to determine motion parameters of physical objects using radio frequency identification (RFID) tags attached to the objects. In one embodiment, a method implemented in a radio frequency identification (RFID) system includes determining a motion parameter of the RFID tag based on detecting a Doppler frequency shift in a radio frequency signal received from the RFID tag.

The present disclosure provides collaborative radiofrequency identification (RFID) readers that employ code division multiple access (CDMA) encoding to simultaneously broadcast to and read responses from tags in an overlapping reading zone with improved data synchronization and read yield rates. In some embodiments, a harmonic backscattering scheme is used to enable the system to have a much higher signal-to-noise ratio (SNR) and sensitivity, while the reader CDMA protocol can be integrated with an initial TDMA polling process or alternative tag CDMA scheme.

In some aspects, material processing head can include a body; an antenna disposed within the body; a first tag, associated with a first consumable component, disposed within a flux communication zone of the body at a first distance from the antenna, the first tag having a first resonant frequency; and a second tag, associated with a second consumable component, disposed within the flux communication zone of the body at a second distance from the antenna, the second tag having a second resonant frequency that is different than the first resonant frequency, where the first and second resonant frequencies are tuned based upon at least one of: i) a difference between the first distance and the second distance; or ii) a characteristic (e.g., shape) of the flux communication zone in which the first tag and/or the second tag is disposed.