An incontinence detection system monitors an area for moisture events and wirelessly transmits moisture-related information to one or more notification devices. The system has a pad that includes a substrate and one or more sensors supported by the substrate. The sensor(s) emit wireless signals indicative of the moisture-related information. A sensor event communication system forwards the sensor signals to another device, such as a notification device. Portions of the system are included in a patient support apparatus, such as a bed.

A multiple identity (ID) tag device is provided. The multiple ID tag device comprises an antenna, a power harvesting circuit electrically coupled to the antenna and configured to receive RF energy collected by the antenna and convert the RF energy into electrical power, a demodulation circuit electrically coupled to the antenna, a modulation circuit electrically coupled to the antenna, a selector circuit electrically coupled to the power harvesting circuit, the demodulation circuit, and the modulation circuit and configured to receive a first signal from the demodulation circuit, send a second signal to the modulation circuit, and receive electrical power from the power harvesting circuit, and a plurality of ID storage circuits electrically coupled to the selector circuit, each ID storage circuit configured to receive the first signal from the selector circuit, send the second signal to the selector circuit, and receive the electrical power from the selector circuit.

MFQRFID, (Multi-Frequency RFID, for purposes of this document) utilizes legacy RFID circuitry adding at least a second transmitter (xmit) and receiver (rec) tuned to a second frequency, through a second antenna array allowing a single core modem, power management and processing/memory to share the at least two xmit/rec channels. Thereafter, the two channels, being on different frequencies, may be independently selected by the RFID circuitry based on signal strength of the communicating external device.

A radio frequency identification (RFID) system for frequency multiplexing includes, in one exemplary embodiment, and RFID interrogator configured for generating an RFID signal, wherein a channel frequency of the RFID signal changes over time; a first narrow band antenna, characterized by a first passband, the first passband corresponding to a first range of frequencies; a second narrow band antenna, characterized by a second passband, the second passband corresponding to a second range of frequencies, wherein the second range of frequencies differs from the first range of frequencies, whereby the second passband differs from the first passband; and first and second feed lines configured for feeding the RFID signal to each of the first and second narrow band antennas, respectively. Other embodiments include systems and methods including similar and different RFID components and aspects for frequency multiplexing.

A system and method for identifying a specific RFID tag includes RFID reader circuitry, such as within an RFID reader, configured for sending and receiving RF signals to detect RFID tags and for obtaining signal parameter information associated with the RFID tags. Processing circuitry is configured for using the signal parameter information for one or more tags of the RFID tags and calculating a tag score for the one or more RFID tags. The processing circuitry is further configured for determining a specific RFID tag using the tag scores for the one or more RFID tags.

Devices and methods for reading multiple types of RFID tags having different frequencies and/or encoding schemes are disclosed. One or more search signals covering a plurality of RFID bands are transmitted. A presence indication of an RFID tag in one of the plurality of RFID bands is detected. An interrogating signal having a carrier frequency tuned to a frequency at which the presence indication is detected is transmitted. A tag response signal comprising tag information associated with the RFID tag is received. A digital response signal based on the tag response signal is digital signal processed to obtain the tag information.

The present invention provides a system and accompanying method for deriving spatial sequence of multiple objects on an interactive surface. The system includes an interactive surface and multiple physical objects. Each object is placed within a finite three-dimensional space on the interactive surface, and embedded with an RFID tag. The interactive surface further includes an RF module, an antenna, a host, an adjustable matching network, a channel switch, and an output module. The host instructs the channel switch to change the parameters of the components of the adjustable matching network to generate a series of resonance frequencies. And the host instructs the antenna to read the RFID tags at the series of resonance frequencies, with an effective reading range of the antenna changing as the resonance frequency changes. The host receives information of multiple sets of RFID tags in multiple readings, derives a spatial sequence of the objects placed on the interactive surface, and provides the output signal or action through the output module. The invention could be applied to the Tower of Hanoi game.

Examples described herein generally relate to a system for monitoring tags in a retail environment. The system includes an exit system including one or more radio frequency identification (RFID) readers that read a tag to obtain exit system measurements associated with a tag detection event. The system includes a memory and a processor configured to execute instructions to configuring each of a plurality of exit gates including a plurality of RFID readers with a different operating frequency than the plurality of RFID readers at an adjacent exit gate. The processor is configured to synchronize the plurality of RFID readers at each exit gate to prevent two readers at the exit gate from concurrently talking with overlapping coverage areas and a same polarization. The processor is configured to detect one or more tags within the coverage areas.

A multi-protocol RFID interrogating system employs a synchronization technique (step-lock) for a backscatter RFID system that allows simultaneous operation of closely spaced interrogators. The multi-protocol RFID interrogating system can communicate with backscatter transponders having different output protocols and with active transponders including: Title 21 compliant RFID backscatter transponders; IT2000 RFID backscatter transponders that provide an extended mode capability beyond Title 21; EGO RFID backscatter transponders, SEGO RFID backscatter transponders; ATA, ISO, ANSI AAR compliant RFID backscatter transponders; and IAG compliant active technology transponders. The system implements a step-lock operation, whereby adjacent interrogators are synchronized to ensure that all downlinks operate within the same time frame and all uplinks operate within the same time frame, to eliminate downlink on uplink interference.

Disclosed is a system for electromagnetic interrogation of RFID transponders including at least one RFID transponder, at least one so-called repeater RFID device and at least one RFID terminal, the at least one RFID terminal is configured to emit an interrogation signal towards the at least one repeater at a frequency F1, the at least one repeater is configured to repeat the interrogation signal with frequency F1 towards the at least one RFID transponder at a frequency F2 and the at least one RFID transponder is configured to emit a backscattered response signal at a frequency F3, the system being characterized in that the at least one repeater is configured to perform an exclusively analog frequency transposition from the frequency F1 to the frequency F2.