47results about How to "Increased read range" patented technology

Systems and methods for beamforming in radio frequency identification (RFID) applications are disclosed. A beamforming system uses a distributed architecture and techniques for antenna beamforming using a feedback control loop to direct radio frequency (RF) energy onto a specific region, referred to as an interrogation zone, which includes a calibration node where one or more RFID tags may be located. The distributed architecture of the beamforming system is resistant to fading and shadowing effects, providing accurate RFID reader operation even in environments with multi-path reflections or environmental changes, such as people moving around or changes in the location of equipment.

Apparatus and methods are provided for automatically interrogating a tagged object using radio frequency identification (RFID) when the object is moved. In one embodiment, a worker is outfitted with a wearable RFID system including an RF antenna, an RFID reader, and a holder to hold the antenna and reader during operation. The system is worn by the worker while the worker moves objects from one place to another. When the worker moves an object with an attached RFID tag, the antenna automatically begins scanning for signals from the object's RFID tag. When a RF signal is received by the antenna, the RFID reader collects the signal and transmits it to a host system which processes the signal to obtain information related to the object to which the RFID tag is attached.

In one embodiment the present invention includes an RFID gaming token with a ferrite core. When the RFID gaming tokens are stacked, the ferrite cores steer the flux field from the excitation antenna through the center of the annular antennas in each token. The resulting flux field increases the efficiency of the energy transfer from the excitation antenna to the passive tags. This increased efficiency also improves the data transfer to and from the passive tags. This increased efficiency allows for reading RFID gaming tokens at a higher stack height (or at a better error rate for a given stack height) as compared to existing air core gaming tokens.

A universal mounting ring has an arcuate or curved upper portion and a plurality of downwardly depending tabs. The universal mounting ring is configured to interface with an electrical enclosure, such as conventional electrical junction boxes to permit a radio frequency identification (RFID) reader to be secured within the enclosure and mate with a wide variety of enclosure cover assemblies manufactured by third parties. The downwardly depending mounting tabs are provided with multiple mounting positions such that the reader may be securely mounted at a plurality of positions relative to a cover assembly.

In a passive keyless entry (PKE) system, a PKE key-fob has magnetic sensor coils arranged in non-perpendicular and non-parallel orientations therebetween, resulting in a more uniform omnidirectional pickup pattern when sensing a time varying magnetic field source from an interrogator base station of the PKE system. The magnetic sensor coils may also be stagger tuned to reduce frequency resonance change due to mutual inductance coupling interaction and/or create a desired magnetic field frequency response pickup pattern. Reducing null zones of different orientations of the PKE key-fob results in more uniform and reliable operation of the PKE system, and tuning the magnetic sensors to operate within the correct frequency and bandwidth of the interrogation magnetic signal increases the useful operating range of the PKE key-fob.

This invention provides a vision system, typically having at least two imaging systems/image sensors that enable a multi-function unit. The first imaging system, typically a standard, on-axis optical configuration can be used for long distances and larger feature sets and the second imaging system is typically an extended-depth of focus/field (DOF) configuration. This second imaging system allows reading of smaller feature sets/objects and/or at shorter distances. The reading range of an overall (e.g.) ID-code-reading vison system is extended and relatively small objects can be accurately imaged. The extended-DOF imaging system sensor can be positioned with its longest dimension in the vertical axis. The system can allow vision system processes to compute the distance from the vision system to the object to generate an autofocus setting for variable optics in the standard imaging system. An aimer can project structured light onto the object surface around the system optical axis.

Embodiments of the invention relate to the field of RFED (radio frequency identification). Some particularly preferred embodiments relate to a high-Q, so-called “full duplex” (FDX) RFID Reader. An RFID tag reader, the reader comprising: an electromagnetic (em) field generator for generating an electromagnetic (em) field for modulation by said tag, said modulation comprising modulated load of said em field by said tag; a detector system responsive to fluctuations in strength of said em field at said reader; a negative feedback system responsive to said detector system to provide a control signal for said em field generator for controlling said em field generator to reduce said detected fluctuations; and a demodulator responsive to said control of said em field to demodulate said em field modulation by said tag.

An RFID tag designed for the human wrist having a UHF beam powered transponder with an antenna that is formed without a resonator loop and configured to maximize a backscatter signal from the transponder when worn on the human wrist.

The present invention generally comprises an apparatus that allows an RFID antenna to obtain information from an RFID tag mounted on a container. The apparatus reproduces the RF field generated by the antenna to a location proximate to the RFID tag. In one embodiment, the apparatus comprises a pickup device and a reproduction device electrically coupled with the pickup device. In another embodiment, the apparatus comprises at least one magnetic rod, which creates a magnetic path for the RF field to travel between the antenna and the RFID tag. In another embodiment, the apparatus comprises a pickup antenna and a reproduction antenna for transmitting the RF signal from the antenna proximate to the RFID tag.

An operating and evaluation circuit of an insect sensor is provided, which has a resistor that is dependent on insect infestation, whereby the circuit during stimulation via a transponder generates a current flow through the resistor, detects a change in the resistor as a change in voltage, and compares it with a predetermined threshold. The circuit includes a transponder-stimulated constant current source, which is connected with the resistor so that a constant voltage drops across the resistor.

The disclosed RFID testing system comprises: a target to be tested with RFID label, a RFID reader, and a testing machine with a base, a first guide rail fixed on base, a second guide rail vertical to the first one for linear movement, a third guide rail with strip shape on the second one and vertical to the first and second ones while fit to linear move on the second one, and a strangulation part connected and moved along the third one and fixed the target or RFID reader.

The present invention provides an RFID card reading device and a card reading method. One or more RF switching switches are connected in series between the radio frequency card reading chip and the reading head, and at least one RF switching switch is periodically controlled by the control unit MCU to poll and switch each The connection and disconnection of the reading head and the radio frequency card reading chip make the radio frequency card reading chip and multiple reading heads respectively connected in one cycle, so that each reading head works in time, which can avoid the collision problem in the control processing module, It can also ensure that the effective power of the read head is not reduced, thereby obtaining a larger reading range and better reading effect. The invention has simple structure, low cost and reliable performance.

A system and method comprising an RFID scanner, a reader or an interrogator for interrogating a transponder of a desired RFID tag to be interrogated; a transmission device for transmitting a desired carrier signal toward the RFID tag to be interrogated; a receiving device for receiving an RFID signal from the RFID tag to be interrogated; a processing device for removing the carrier signal from the RFID signal and thereby leaving an encoded data field of the RFID tag to be interrogated and processing the encoded data field for determining a start bit sequence of the encoded data field for at least one scan; and an averaging device for averaging the encoded data fields of at least two scans with one another and facilitate reading the encoded data field of the RFID tag to be interrogated.

The invention discloses an ultrathin high-gain narrow beam antenna. The ultrathin high-gain narrow beam antenna comprises an oscillator reflection plate, and an antenna oscillator and a feed network which are arranged on the oscillator reflection plate. The antenna oscillator comprises a first oscillator, a second oscillator and a third oscillator which are sequentially arranged on the same surface of the oscillator reflection plate at intervals, wherein each antenna oscillator is a square metal plate, the side length of the square metal plate is 0.25[lambda], and [lambda] represents the central wavelength of the antenna. According to the invention, the three antenna oscillators 2 with the side length of 0.25[lambda] are arranged on the same surface of the oscillator reflection plate at intervals, so that the structure is compact, and the thin and small antenna is favorably achieved. The beam width is reduced and the gain is increased by combining a specific oscillator reflection plateand a feed network through array combination. Through experimental simulation, the gain of the ultrathin high-gain narrow beam antenna provided by the present embodiment is above 9dBi, and the 3dB width is less than 45 degrees. The invention also discloses an anti-theft carpet.

The invention relates to a blind self-adaptive beam-forming algorithm, and particularly to a blind self-adaptive beam-forming algorithm applied to full-duplex passive ultrahigh-frequency radio frequency identification systems (Passive UHF RFID systems). The algorithm innovatively provides an iterative concept, and thus eliminates necessity and complexity of channel estimation as compared with an original method, an operation process is simple, costs of system running are greatly reduced, and efficiency is improved at the same time.

The invention discloses a three-dimensional memory and a reading method thereof. The three-dimensional memory includes a phase change memory cell and a gating tube, wherein the phase change memory cell is connected with the gating tube in series to form a series structure; and is located between a word line and a bit line; the word lines and the bit lines are stacked in multiple layers to form a three-dimensional structure; when the phase change memory cell is in a high resistance state and when the gating tube is just opened, the voltage at the two ends of the phase change memory cell is smaller than the threshold voltage for converting the phase change memory cell from a high resistance state to a low resistance state; therefore, the phase change memory cell is not enough to generate phase change; only when the voltage at two ends of the three-dimensional memory is continuously increased to enable the voltage at two ends of the phase change memory cell to exceed the threshold voltage; and therefore, the phase change memory cell is subjected to phase change only when the threshold voltage of the phase change memory cell is larger than the threshold voltage of the phase change memory cell, and then the range of the read voltage is enlarged, and the margin of the optional read voltage is larger, and the problems of misreading and misoperation are reduced, and the utilization rate of the threshold voltage of the phase change memory cell is increased, and the requirement on the threshold voltage of the phase change memory cell is reduced.

The invention discloses an electronic tag for steel tubes. The electronic tag comprises a tag circuit board and a tag chip located on the tag circuit board, a magnetic isolation layer and a strong magnet are orderly arranged under the tag circuit board, and the tag circuit board, the magnetic isolation layer and the strong magnet are fixedly connected with each other; and the tag chip is provided with a chip protection layer. The electronic tag for steel tubes has the following benefits that: with the magnetic isolation layer arranged between the tag circuit board and the strong magnet, sundries, such as a mass of iron rust, are prevented from being attracted around the tag circuit board; an angle adjusting screw is used for adjusting the angle between the tag circuit board and the inner wall of the steel tube so as to increase the range for reading the tag chip; and the chip protection layer can protect the tag chip in high-pressure environment. The electronic tag is matched with a microwave antenna, and can input steel tube information in a steel tube production management system in real time, so that work efficiency of steel tube manufacturing is improved greatly.

The invention relates to the tuning of a radio transponder having an antenna, a transceiver unit and a resonant circuit connected to the antenna. The resonant circuit comprises a plurality of capacitors arranged in parallel, each capacitor being arranged in series with a fuse. In this arrangement, a capacitor is switchable by means of a fuse arranged in series for the purpose of tuning the resonant circuit. A control unit associated with the resonant circuit is designed and set up to produce a switching signal for a respective fuse of the resonant circuit on the basis of a control signal transmitted by a radio transponder reader.