93results about How to "Improve reading distance" patented technology

A system for conveying a radio frequency (RF) signal from a base station to a detached integrated circuit (IC) has an intermediate resonant circuit and an IC. The intermediate resonant circuit is configured to resonate in response to the RF signal from the base station, reproducing the RF signal. The IC has an integral resonant circuit configured to resonate in response to the reproduced RF signal. The IC and the intermediate resonant circuit are affixed proximate each other. Both are separate from the base station and each other. Either or both of the intermediate resonant circuit and the integral resonant circuit may contact a high magnetic permeability layer. The intermediate resonant circuit may be formed of conductive ink.

A broadband antenna includes a coupling loop and a number of radiation bodies. The coupling loop is electrically coupled to a chip and the chip records several pieces of data. The radiation bodies respectively form a number of resonance loops with the coupling loop for providing a number of resonance frequencies of the broadband antenna. The coupling loop can feed in signals for reading data in the chip according to the resonance frequencies.

A system and method for tracking articles and controlling inventory thereof on a real time basis comprising the use of a tag assembly including a plurality of tags including both active tags and passive tags distinguishable from one another by the provision of a self contained power source in the active tags. One or more readers are disposed within a locale being monitored and are structured to communicate received data transmission from a host controller, for additional administrative processing in terms of determining the existence, location and/or movement of various articles with which the plurality of tags are directly associated. Depending on their category the tags may be activated by either entering an electric field of a predetermined first frequency or by receiving an activation signal from the reader assembly also transmitted at the first predetermined frequency. Communication between the tags and the reader occurs at a second frequency being different from the first frequency.

Turning now to the drawings, systems and methods for reading RFID transponders utilizing readers in which the Q-factor of the resonant antenna of the reader shifts over the course of the reader's interrogation cycle in response to the detection of data from FDX and HDX RFID transponders in accordance with embodiments of the invention are illustrated. One embodiment having a dynamically adjustable Q-factor, wherein the reader transmits an activation signal configured to activate half duplex and full duplex transponders includes a signal source configured to drive a resonant antenna and a dynamic switching circuit configured to set the Q-factor of the resonant antenna to a first value during the transmission of the activation signal. In addition, the dynamic switching circuit is configured to set the Q-factor of the resonant antenna to a second value below the first value during and/or in response to detection of a data signal from a full duplex transponder, the dynamic switching circuit is also configured to set the Q-factor of the resonant antenna to a third value below the second value when the RFID reader is not transmitting the activation signal, and the resonant antenna is multi-filar and the dynamic switching circuit is configured to control the Q-factor of the multi-filar resonant antenna by controlling the filars that are incorporated into the resonant antenna circuit.

A system and method for tracking articles and monitoring them on a real time basis comprising the use of a tag and one or more reader disposed within a locale being monitored and structured to communicate received data transmission to or from a host controller, for additional administrative processing in terms of determining the existence, location, state and/or movement of various articles with which the plurality of tags are directly associated. Depending on their category the tags may be activated by either entering an electric field of a predetermined first frequency or by receiving an activation signal from the reader assembly also transmitted at the first predetermined frequency. Communication between the tags and the reader occurs at a second frequency being different from the first frequency.

A non-pervasive modification to radio frequency identification (RFID) tag antennas is provided that can double the tag's reading range distance. Parasitic elements, such as a reflector and one or more directors, are added at appropriate separations to form a Yagi antenna. As a result, the antenna's gain is increased and consequently so is the RFID tag's reading range. The tag antenna's gain can be achieved without directly connecting to or modifying the existing RFID tag. However, since directionality is increased, multiple RFID tags can be attached to an object so that the tagged object can be read from multiple directions.

One characteristic of electronic labels is that they can be read and written on without electrical contact through the communication coil (1). The reading heading is then positioned at some distance and communicates with the label through electromagnetic waves. When these labels are placed on metallic objects, reading becomes difficult even impossible because of the dispersion of the waves in the object. To overcome this drawback, the invention proposes the adding of an electromagnetic conductive element (3, 3′) to the coil (1) in order to insulate it (1) and enhance the reception quality.

The invention relates to an RFID passive sensing device used for measuring contact temperature of a power switch cabinet. The device includes an RFID passive sensor installed in the vicinity of a switch cabinet contact, and an RFID reader antenna and an RFID temperature reader which are installed at an inner side of a switch cabinet body, and the RFID reader antenna and the RFID temperature reader are connected by adoption of a coaxial cable; RFID passive sensor is internally provided with an RFID passive tag antenna circuit and a temperature measuring RFID circuit; and the RFID temperature reader includes a microprocessor, and a system power module, an external communication module and a wireless transceiving module which are electrically connected with the microprocessor. The RFID passive sensing device used for measuring the contact temperature of the power switch cabinet is reasonable in structure, small in size, high in stability, and convenient to install, does not need to install a battery, has a long reading distance, and satisfies environment requirements of temperature measurement of a switch cabinet.

The present invention relates to a real-time jewelry positioning system, especially to a real-time positioning system based on a radio frequency identification (RFID) technology. The system comprises a jewelry tag, a personnel tag, a RFID reader, a RFID antenna and a server. The RFID reader is a fixed type RFID reader, and is communicated with the server by a RJ45 port or wireless network. The RFID antenna is connected with the RFID reader. The real-time jewelry positioning system of the present invention has the following advantages that: the real-time positioning problem of the jewelry can be solved, the purpose of intelligent management of the jewelry is achieved, and a guarantee is provided for the safety of the jewelry.

The invention relates to an echo frequency discrimination method for a passive radio frequency identification temperature measurement system. The method comprises the following steps of 1, dividing different frequency points for a frequency band of starting frequency, setting different frequency point numbers for the different frequency points, setting the starting frequency, and performing step-scan within a frequency range; 2, acquiring a group of power sampling signals and a group of frequency sampling signals; 3, performing time-domain judgment-based time-domain energy validation for five times for characteristics of a unique medium of a radio frequency identification tag; 4, converting a time-domain signal into a frequency-domain signal, and performing frequency-domain validation twice; and 5, obtaining a final result by combining the time-domain validation and the frequency-domain validation. According to the method, acquired echo frequency is subjected to strict multi-stage time-domain and frequency-domain judgment, a combined multi-stage frequency addition mode is adopted, and correct echo frequency is obtained by hybrid time-domain and frequency-domain discrimination and multi-stage condition judgment, so that air interference factors existing all the time in a radio frequency identification technology are better avoided, accurate and high-quality echo frequency can be effectively acquired, and the reading distance of a passive tag is greatly prolonged.

A laminate is formed from a carrier layer and an electrically conductive layer. In one section, the conductive layer is formed into an antenna structure. The antenna structure can be produced in a joint operation with the electrically conductive layer. The antenna structure is connected to a microchip, so that data can be written in or read out without contact in a wireless transponder system.

The invention relates to a radio frequency identification (RFID) label and an RFID label antenna. The RFID label antenna comprises a radiation layer, a ground layer and a dielectric layer, wherein thedielectric layer is used for converging and transferring energy radiated from the radiation layer to the ground layer, the radiation layer and the ground layer are conducted by a short-circuit pin, the radiation layer comprises at least two radiation bodies and an isolation structure, the at least two radiation bodies are suitably used for simulating different resonant frequencies, the isolationstructure is suitably used for isolating the at least two radiation bodies, the at least two radiation bodies comprise at least one first radiation body, and the impedance where a resonant frequency simulated by the first radiation body is located is determined by coupling degree between the impedance and resonant frequencies simulated by other radiation bodies. By employing the RFID label antenna, the reading distance of the RFID label with a PIFA antenna can be expanded.

The invention relates to the field of RFID, and provides a plane X-shaped slit electronic tag. The tag comprises an antenna, a chip and a substrate, wherein the substrate is rectangular, and accommodates the antenna and the chip. The antenna is matched with the chip. The antenna comprises a radiation surface and a slit, wherein the radiation surface is located on the surface of the substrate. The slit is provided with two arms which are interlaced with each other to form an X shape, and the two arms are in left-right and up-down symmetry, and the intersection point of the two arms is located at the center of the substrate. The chip is located at the intersection of the two arms. According to the invention, a novel design method for the slit electronic tag is provided, and the method can conveniently adjust the impedance of the antenna, and achieve the conjugate matching with the chip. The chip is fixed on a base material through solidification, and can be pasted on the surface of an object during utilization. Because of the radiation characteristics of a magnetic current element of a slit antenna, the electronic tag is especially suitable for a windshield with a metal explosion-proof film, an object surface coated with metal paint, and a human body.

The invention relates to an antenna, particularly to an antenna device for portable data acquisition terminals. The antenna device for portable data acquisition terminals comprises a card reading coil arranged in the case of a top reading head connected to one end of a pull rod, the other end of the pull rod is connected to a handle provided with a card reading circuit, the pull rod is provided with a wire connecting the card reading coil and the card reading circuit, the card reading circuit is connected to a plug through a data wire. According to the invention, the acquisition of distant articles is convenient, the inference from surrounding conductors and circuits in the acquisition terminal is reduced, the reading distance is increased, and the reading performance is improved. Besides, the device has telescopic function, is portable and suitable for miniaturization of portable data acquisition terminals.

A battery-assisted radio frequency identification (RFID) tag having a battery-assisted circuit and a filter is provided. The battery-assisted circuit generates a radio frequency signal whose frequency is outside an operating frequency band of the RFID tag to supply additional power to the RFID tag. The filter filters the radio frequency signal output from the battery-assisted circuit before the RFID tag demodulates a reader command, so that a modulation depth of the read command is less affected by multi-carrier. By using the battery-assisted circuit and the filter, the RFID tag has a longer read range and is less affected by multipath fading effects.