94results 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.

A system and method for the use of ultra high frequency RFID tags in conjunction with metal substrates, as well as substrates used to contain liquid. Briefly, an RFID isolator comprised of a material with complex magnetic permeability, used either by itself, or in combination with dielectric isolator material, is interposed between the RFID tag and the substrate. Alternatively, a material possessing at least two distinct dielectric constants is interposed between the RFID tag and the substrate, such that there is a high dielectric constant at the interface with the substrate, and a low dielectric constant at the interface with the RFID tag. This material can be a single material having a dielectric constant gradient, or alternatively, two or more separate layers, each with a uniform but different dielectric constant, sandwiched together.

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 the use of ultra high frequency RFID tags in conjunction with metal substrates, as well as substrates used to contain liquid. Briefly, an RFID isolator comprised of a material with complex magnetic permeability, used either by itself, or in combination with dielectric isolator material, is interposed between the RFID tag and the substrate. Alternatively, a material possessing at least two distinct dielectric constants is interposed between the RFID tag and the substrate, such that there is a high dielectric constant at the interface with the substrate, and a low dielectric constant at the interface with the RFID tag. This material can be a single material having a dielectric constant gradient, or alternatively, two or more separate layers, each with a uniform but different dielectric constant, sandwiched together.

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.

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.

The invention discloses an online mobile inspection system and an online mobile inspection method for substation equipment based on a wireless private power network. The system comprises the wireless private power network, a mobile terminal, a plurality of electronic tags and a substation communication control room, wherein the substation communication machine room control room comprises a base station baseband processing unit, core network equipment, a master station and a system network management platform; the signal output end of each electronic tag is in matched and butted with the signal access end of the mobile terminal; the signal output end of the mobile terminal is wirelessly connected with the substation communication machine room control room through an air interface of a roofing antenna and used for bi-directionally transmitting data to the substation communication machine room control room through a wireless base station and the roofing antenna. The system can keep in touch with the master station in real time, can feed back the inspection condition in real time, and is capable of ensuring the safety and the reliability of wireless inspection data transmission.

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 invention relates to a laser bar code scanner and an executing method thereof, wherein the method comprises rapidly measuring the distance between a laser bar code scanner and a bar code by means of the mode of light-ranging, calculating and switching signals through a signal processor, and automatically adjusting the width of scanning light transmitted by the laser bar code scanner by the rotation angles of an automatic control-rotating device at any time, and therefore, scanning light can automatically adjust correct intensity and width as the variation of the distance when being used in different distances, and the reading efficiency of the laser bar code scanner can be greatly improved.

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.

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.

The invention discloses a sensitivity amplifier for EEPROM. It includes charge control circuit and detecting output circuit. The charge control circuit includes PMOS tube P1 and NMOS tubes N1, N2. Detecting output circuit includes PMOS tubes P2, P3 and NMOS tubes N3, N4, N5. The invention uses the bidirectional ducting ability of MOS tube to take charge to drain electrode. The source electrodes of floating grid tube are connected to each other to decrease charging circuit quantity. By modifying the reverse threshold value of the inverter, the charging voltage would be decreased, and read speed would be improved. The invention is especially suitable for embedded EEPROM.

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.

The invention discloses an RFID (Radio Frequency Identification) high-gain circularly polarized microstrip antenna array. The RFID high-gain circularly polarized microstrip antenna array comprises a radiation plate and a reflection plate, wherein the radiation plate comprises a radiation plate dielectric substrate and four radiation units on the surface of the radiation plate dielectric substrate, a radiation unit feed point is arranged on each radiation unit, the reflection plate comprises a reflection plate medium substrate and a feed network on the surface of the reflection plate medium substrate, and the radiation unit feed points are connected with the feed network through support columns and signal wires on the support columns; supplementary angles are formed on two opposite angles of each radiation unit, the positions of the supplementary angles on the four radiation units are consistent, and circularly polarized radiation of antennas is realized by combining a one-point central feed way with the supplementary angles. In order to reduce a standing wave ratio and improve radiation efficiency, the RFID high-gain circularly polarized microstrip antenna array further comprises four tuning aluminum columns which are fixed on the radiation plate. The RFID high-gain circularly polarized microstrip antenna array disclosed by the invention has the advantages of high gain, low axial ratio, half-power wave bandwidth, wide radiation frequency and the like.

The invention discloses a switchable antenna of a near and far field RFID reader-writer, and a design method of thereof. The antenna is an antenna of a double-faced microstrip line feed network structure and comprises two feed ports used for switching near and far field working modes, a dipole array structure, metal through holes, an integrated resistor and a dielectric substrate; the dipole array structure comprises a square ring composed of four dipole antennas, wherein each dipole antenna is separately fed by a 1 / 4 impedance transformation structure; six metal through holes are formed, wherein four metal through holes are separately connected with the dipole array structure through the double-faced microstrip line feed network structure (QDSPSL), and the other two metal through holes are welded with a coaxial feed inner core; and the integrated resistor is integrated with the feed port in a far field working mode and is used for realizing broadband impedance matching of the antenna in the far field working mode. According to the switchable antenna disclosed by the invention, the working mode of the RFID reader-writer antenna is switched through the feed point position, the single working mode of the traditional antenna is overcome, and the application cost can be greatly reduced.

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 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.

The invention discloses an IT asset management unit, an IT asset management system and an IT asset management method. IT asset information is stored through the IT asset management unit, therefore, input errors cannot occur, the IT asset information is not prone to damage, stain-resistant performance is strong, the IT asset information can be stored for a long time, and viewing is convenient. The IT asset information is transmitted through radio frequency signals, and therefore the distance range for reading data is effectively increased. The IT asset management system is used for managing IT assets, therefore, the capacity to manage the IT assets can be effectively improved, and the conditions of the IT assets can be searched quickly and conveniently. The procedures of IT asset management are saved and working efficiency is improved. Meanwhile, position information management of the IT assets can also be realized according to the strength of received radio frequency signals. Therefore, the problem that the IT assets of an enterprise are prone to being lost due to the fact that the IT assets are not managed by specially-assigned persons is solved.

The antenna comprises a magnetic core (2), three windings (31, 32, 33) wound around the magnetic core (2) and an electrically insulated base (1) on which the magnetic core (2) wound with these windings (31,32,33) is arranged. The insulated base (1) includes metallic tabs (121 . . . 128) electrically connected to said windings (31, 32, 33) and the base (1) has a bottom surface with electrically conductive plates (131 . . . 138) with connection to the metallic tabs (121 . . . 128) and providing a layout for a SMT mounting, The antenna comprises an electrically insulated cap (4), having an upper surface (4U) including a metallized surface high frequency coil (42) working as a HF antenna and a side surface (4S), two ends (411, 412) of the coil (42) being arranged on the side surface (4S) for connection to the metallic tabs (121 . . . 128) of the electrically insulated base (1).

The invention discloses a morning check device. A fingerprint recognition module is added, and fingerprint information of parents related to children is input in advance and stored in a fingerprint data base, so that identities of the parents can be recognized easily when the children are sent to and picked up from school, and troublesomeness and potential safety hazards in manual confirmation of identity information of the parents who send and pick up the children; a face recognition module is added, and face information of the children or the parents of the children is input in advance and stored in a face information database, so that compared with a card reading module and the fingerprint recognition module, the face recognition module can reduce workload and unsafety in children sending and pickup work, and diversification, optionality and simplification of identity recognition are realized; a design mode that an antenna unit and a mainboard circuit are separated is adopted, so that electromagnetic interference to an antenna due to the mainboard circuit is reduced, and card reading distance is increased; a design mode that a button is parallelly connected with a capacitor is adopted, so that electric level decreasing speed can be slowed down, and pause of a main control chip of the morning check device is avoided; the morning check device has an anti-shake function, so that more sensitivity in button reading action is realized.

A radio frequency identification RFID anti-metal microstrip tag antenna disclosed by the invention is high in gain, low in cost and long in reading distance. According to the technical scheme, a radiation patch, a dielectric substrate and a metal floor form a resonant cavity, and the radiation patch covers a rectangular groove and is fixedly provided with a strip-shaped mounting seam of an RFID tag chip electrically connected with the radiation patch; a first strip-shaped gap is formed above a U-shaped groove, and a second strip-shaped gap and a third strip-shaped gap are formed in the left side and the right side of the U-shaped groove; and a protrusion is arranged at the bottom of the rectangular groove, one end of the strip-shaped mounting seam penetrates through the protrusion and is connected with the rectangular groove, the other end of the strip-shaped mounting seam penetrates through the bottom of the radiation patch, an edge field formed by gaps at the two ends of the U-shapedgroove generates radiation, and the metal floor, the radiation patch, a feeder line and a grounding line form an RFID anti-metal microstrip tag antenna. Based on the structure of the antenna and a slotting design, the performance of the tag is ensured under the condition that the thickness of the tag is reduced.

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.