65results about How to "Long reading distance" patented technology

The invention discloses an electrical locomotive auto-passing neutral section control system. In the control system, a signal generator used for transmitting passing neutral section anticipating signal is arranged on a vehicle mainframe of an electrical locomotive, wherein the vehicle mainframe comprises a signal receiver used for receiving the passing neutral section anticipating signal, a memory unit used for storing the required time of locomotive neutral section operation, a clock, a speed sensor used for providing the current speed of the electrical locomotive for a controller, the controller used for outputting passing neutral section control signal and restoring the control signal and a contact network connection controller used for controlling a contact network electrical connection device. The timing that the invention executes the auto-passing neutral section operation is accurate and the reliability of the auto-passing neutral section control is high.

An improved electronics assembly for integration with a tire structure includes an acoustic wave device such as a SAW sensor connected as a feedback element in an active amplifier and further coupled to an antenna element, thus forming an active transmitter configuration. Such a circuit configuration provides for the ability to actively transmit a combination of information from integrated tire electronics to a remote receiver location. The combination of information corresponds to the physical parameters sensed by the acoustic wave device as well as digital data superimposed on the RF signal emitted by the acoustic wave device by selectively switching the amplifier on and off. Optional integrated power sources configure the electronics assembly for operation as an actively transmitting device.

The invention discloses a speed measurement system based on an ultrahigh frequency radio frequency identification label and a measurement method. The measurement system comprises a radio frequency identification label, a first antenna, a second antenna, a radio frequency identification reader and a data center. The first antenna and the second antenna are connected to the radio frequency identification reader respectively. The radio frequency identification reader receives signals emitted by the radio frequency identification label through the first antenna and the second antenna respectively and sends to the data center respectively. The method in the invention is based on an ultrahigh frequency RFID technology. A Lagrange interpolation method is used to expand a data source. Through a maximum value time difference method of Gaussian fitting between partitions and kalman filter combination and a correlation time difference method of a Phat processor and SCOT weighting, data read by a reader is processed so that accurate measurement of a walking speed is realized. By using the system and the method, an error can be effectively reduced and precision is increased, and a large calculated amount is not needed. The ultrahigh frequency RFID label possesses advantages that the size is small; a price is low; a reading distance is long and so on. The system and the method can be made into a sensor which can be worn on an elder so as to carry out accurate measurement of the walking speed.

A range-finding system for a portable image reader is described. The range-finding system uses a distance-measuring device, such as an ultrasonic transducer, to determine the distance between the reader and a target, such as a label containing a bar code. An operator receives a visual indication which will assist in positioning the image reader within the optimal reading range of the target. The visual indicator may include three LED's of different color or with different blinking rates which will indicate to the operator that the reader is short, long or in the optimal reading range of the reader. In one embodiment, the reader would automatically cycle through an image acquisition or decode sequence when range finder detects that the target is within the optimal reading range of the reader. In another embodiment, the visual indicator will prompt the operator to manually trigger the image acquisition or decode sequence once the reader is positioned within the optimal reading range.

The invention discloses a radio frequency tag data coding system and a radio frequency tag data coding method for vehicle identification. The system comprises a computer, an encryption/decryption and verification code calculation device, an RFID reading-writing device and an RFID tag. The computer divides an EPC region of the RFID tag into a data part and a verification code part and codes a license plate number; the encryption/decryption and verification code calculation device encrypts the coded license plate number data and calculates the verification code of the license plate number data; the computer concatenates the license plate number data and the verification code; the RFID reading-writing device writes the concatenation data into the EPC region; the encryption/decryption and verification code calculation device carries out decryption to obtain decryption data and calculates the verification code; and the computer compares the decrypted verification code with the verification code part of the EPC region and judges whether data in the EPC region is tampered. The defect that data encryption and verification code calculation cannot be carried out due to the fact that the license plate number is stored in the EPC region of the RFID tag in the prior art is overcome.

The invention discloses an intelligent management system based on wireless sensor network and Bluetooth radio frequency recognition technology. The system is composed of positioning labels, a Bluetooth gateway, a switch, a server and a PC computer side; the Bluetooth gateway is installed in a monitored region, the Bluetooth positioning label is hung on the personnel or an object, the positioning label continuously sends a signal, the Bluetooth gateway continuously search the signal sent by the positioning label; the server determines a location of the positioning label on a map according to the distance obtained by converting the searched positioning label signal intensity and between the positioning label and the Bluetooth gateway and, and according to a geometric relation between the Bluetooth gateway and the positioning label, and displays the location at the PC computer side. The management problem of the staff of the factory is solved, and the simple personnel region positioning is realized, the convenience is brought for the management personnel, at the same time, numerous management problems of the factor are solved, the workers of the factory can be strictly managed, the burden of the management personnel is reduced, the accident is reduced, the security of the worker is guaranteed, the factory economy loss caused by accident is avoided, the reputation of the factory isimproved, and greater benefit is brought for the factory.

The invention discloses a passive ultrahigh frequency RFID (Radio Frequency Identification Devices) tour guiding system and an operation method. The tour guidance and the management of scenic spots or large exhibition halls can be realized by adopting the ultrahigh frequency RFID technology. The tour guiding system comprises a handset control system and an electronic tag, wherein the electronic tag is a passive electronic tag; when identifying the existence of the electronic tag, the handset control system starts to read ID number data of the electronic tag, and transmits the ID number data to an MCU (Microprogrammed Control Unit); the MCU transmits the received ID number data to an audio decoding unit; and the audio decoding unit starts to find an audio file corresponding to the ID number data in an SD (Secure Digital Memory) card, decodes the audio file, and play an analog stereo signal to a stereo output device. The tour guiding system is convenient to use, is low in cost, is convenient to maintain, and has far reading distance and quick identification speed.

The invention claims a multifunctional circulating packaging box which is provided with a RFID identification card and is capable of overcoming such disadvantages of RF cards in the prior art that the price is high, the identification rate is low and wide use in the storage physical distribution management is not possible. The multifunctional circulating packaging box adopts the technical proposal that: the circulating packaging box comprises a top cover, a front panel, a back panel, two side plate composite members and a base board, wherein, the two side plate composite members comprise at least one intermediate plate and side plates symmetrically arranged on two sides of the intermediate plate. The circulating packaging box is characterized in that the front panel is inserted with a passive tag, or/and the side plates are provided with at least one of active tag or semi-passive tag. The application of the circulating packaging box in the storage physical distribution management on one hand saves the operation cost for manufacturers, importers and vendors, and on the other hand improves the efficiency of goods counting and the accuracy of the identification, thus greatly improving the intelligent management level of physical distribution, storage and relative trades.

The invention discloses a novel leaky cable for an Internet of things application. The novel leaky cable comprises an inner conductor, a dielectric layer, an outer conductor, an insulating protective layer which are orderly arranged from an inner layer to an outer layer. The outer conductor is provided with continuous slots along an axial direction, and two sides of the continuous slots are provided with periodic slots. The continuous slots are wavy bend slots or straight line type slots, and the periodic slots at two sides of the continuous slots are mutually staggered. The periodic slots are single triangular slots or combined slots of multiple triangular slots, and the periodic slots are L-shaped or U-shaped slots. The novel leaky cable is suitable for an Internet of things RFID sensing application and has high coupling loss. As an ultra-high frequency (UHF) networking antenna, the high coupling loss leaky coaxial cable has the advantages that large radiation energy can be provided, and thus a label is remotely activated to achieve the purpose of reading.

A transponder unit which can be integrated in a transport unit or a card or the like. The transponder unit includes, in addition to an encapsulated transponder of an integrated circuit, an aerial winding having a resistance R_A and a capacitor parallel thereto and having a capacitance C_A. A closed coupling circuit of secondary winding is coupled with the aerial winding by a mutual inductance M_SA and a substantially larger primary winding in series with the secondary winding and having fewer turns, for example only one turn. To achieve almost optimum energy transfer between a reading device and the transponder and to increase the permissible reading distance, the mutual inductance M_SA is adjusted to comply with the relationship M_SA=√{square root over ( )}[R_A/ω) (L_P+L_S+2M_PS)], where ω²=1/(L_AC_A) is true for the receiving frequency ω of the transponder and L_p and L_S are the inductances of the primary winding and of the secondary winding and M_PS is their mutual inductance.

The invention relates to the field of radio frequency identification (RFID) and provides a plane broadband passive electronic tag. The tag comprises an antenna, a chip and a substrate, wherein the substrate is rectangular and is used for containing the antenna and the chip; the antenna is matched with the chip; the antenna comprises a rectangular radiation surface and a short-circuit ring; the short-circuit ring is located at the bottom of the substrate; the rectangular radiation surface comprises a rectangular radiation surface obtained by removing a rectangular shape of the short-circuit ring; the chip is located at the place, close to the edge of the substrate, on the short-circuit ring. The plane broadband passive electronic tag which is applied to the surface of an object with a high dielectric constant has a farther reading distance and a wide bandwidth, and has strong applicability; meanwhile, the chip is located at the place close to the edge of the substrate so that information concluding codes, characters and patterns and the like can be conveniently printed on the back surface of the tag and the chip is prevented from being crushed in a printing process; the tag can be conveniently applied to various fields.

The embodiment of the invention provides a UHF RFID reader antenna and a switching method. The antenna comprises the content as follows: 2N same antenna elements are uniformly distributed at the top side of a printed circuit board; N-equal part power dividers and phase extension lines are arranged at the top side and the bottom side of the printed circuit board respectively; radio frequency switches are also arranged; N antenna elements at the top side and the N-equal part power divider and phase extension lines at the top side form a first group of N-arm feed networks which are the same in amplitude and have a phase difference of 360 degrees/N; the other N antenna elements and the N-equal part power divider and phase extension lines at the bottom side form a second group of N-arm feed networks which are the same in amplitude and have the phase difference of 360 degrees/N; and the radio frequency switches control and switch the antenna into a mode of the first group of N-arm feed networks or a mode of the second group of N-arm feed networks. According to the UHF RFID reader antenna, the characteristic of a long identification distance of UHF RFID is maintained, and meanwhile, the identification coverage area of a near-field area is increased under the condition of not increasing the cost and the complexity of a system.

The present invention discloses a metal-resistant flat tag. The metal-resistant flat tag is characterized in that the tag comprises an antenna, a chip and a substrate; the substrate accommodates the antenna and the chip; the antenna comprises a radiation surface, a first slot and a second slot, and a first slot group and a second slot group; the antenna is located at the center of the substrate; the first slot and the second slot, and the first slot group and the second slot group are respectively mirror-symmetrical with respect to the center of the substrate; the first slot and the second slot are arranged in the width direction of the radiating surface and the first slot group and the second slot group are arranged in the length direction of the radiating surface; and the first slot andthe second slot, and the first slot group and the second slot group are obtained by removing the radiation surface material from the rectangular radiation surface. The tag disclosed by the present invention can be applied to the metal-resistant ceramics tag with a long reading distance on the glass surface, and in the presence of metal, the tag has acceptable sensitivity and strong applicability.

The invention discloses an RFID tag provided with an arc-shaped opening, comprising a waterproof base sheet, an RFID chip and an RFID antenna connected to the RFID chip signal; the RFID chip and the RFID antenna are packaged In the encapsulation body; the reading distance is long, and the reading distance can reach 11-13m after testing. The reading distance of ordinary RFID tag antennas is less than 10m. Various antennas have good performance, small standing wave ratio, low return loss, high gain and omnidirectionality; they have high performance when used in ultra-high frequency (860-960MHz), especially around 925MHz.

The invention discloses an ultra-high frequency RFID label antenna for wirelessly measuring a dielectric constant. The ultra-high frequency RFID label antenna comprises a dielectric substrate, a radiation unit and a matching unit, wherein the radiation unit comprises a radio frequency chip, a first fan-shaped metal layer and a second fan-shaped metal layer, the first fan-shaped metal layer and thesecond fan-shaped metal layer both are attached onto an upper surface of the dielectric substrate, a left-right symmetric surface of the dielectric substrate is used as a reference surface, a centralline of the dielectric substrate is arranged on the reference surface, the first fan-shaped metal layer is arranged at a left side of the reference surface, the second fan-shaped metal layer is arranged at right side of the reference surface, the matching unit comprises a first arc metal layer and a second arc metal layer, the first arc metal layer and the second arc metal layer are attached ontoa lower end surface of the dielectric substrate, a circle center of the first arc metal layer is arranged on a straight line perpendicular to the dielectric substrate and passing through a center ofthe dielectric substrate, and a circle center of the second arc metal layer is arranged on a straight line perpendicular to the dielectric substrate and passing through the center of the dielectric substrate. The ultra-high frequency RFID label antenna has the advantages of relatively small size and relatively long reading distance.

The invention relates to an RFID (Radio Frequency Identification) read-write device and particularly relates to a mobile phone card with an RFID reader chip, wherein the mobile phone card combines with the RFID read-write device and a mobile communication device. The mobile phone card with the RFID reader chip comprises an SIM (Subscriber Identity Module) card on which an SIM card microprocessor chip, an ultrahigh frequency RFID reader chip and an antenna are integrated, wherein the ultrahigh frequency RFID reader chip is connected with the SIM microprocessor chip, and the ultrahigh frequency RFID reader chip comprises the RFID reader chip, a power amplifier, a coupler and an active crystal oscillator; the RFID reader chip is connected with the coupler through the power amplifier, and the coupler is further connected with the antenna; and the RFID reader chip is further connected with the active crystal oscillator. By utilizing the mobile phone card with the RFID reader chip on a mobile phone, the normal mobile phone has a function of reading and writing an RFID electronic label; and the mobile phone with the mobile phone card has the advantages of longer reading distance and higher data transmission speed while reading and writing the label.