Introduction of UHF RFID technology patent application in China

UHF RFID technology has the ability to read multiple tags at one time, has strong penetrability, can read and write multiple times, and has large memory capacity. The passive electronic tag has low cost, small size, convenient use, high reliability and longevity. Features have been valued by countries around the world.

The core technologies of UHF RFID mainly include: anti-collision algorithm, low-power chip design, UHF electronic tag antenna design, test and certification. Domestically, the development of UHF automatic identification technology has lagged behind the international 2-3 years. Although a number of patented technologies have been formed, the number is small. The following is a brief description of the patents that these technologies have applied for in China and have been published or authorized.

1) Shenzhen China Communication Technology Co., Ltd. applied for the Chinese invention patent (CN101013465) in February 2007, which relates to a multi-tag anti-collision algorithm in the UHF long-distance automatic identification system. The algorithm is based on the data returned by the tag collision, dynamic Adjusting the Q value, which includes the following steps: a, the preset Q value is 0 to 15; b, the reader sends a QUERY command and receives the tag return; c, the reader sends 2 Q QUERY REP (Query response) command; d, after steps a, b, c, the collision count is 0, the label reading process ends; if the collision number is not 0, the Q value of the next QUERY command is determined according to the number of collisions, repeating Steps a, b, c. The dynamic Q value is determined by the following method: a, estimating the quantity value of the label; b, calculating the base-2 index based on the estimated value of the number of labels and the power exponential operation of the calculated probability, that is, the new Q value. The invention can realize the complete and complete reading of the multi-label in the UHF remote automatic identification system and has high reading efficiency.

2) The Chinese invention patent (CN101183422) applied by Fudan University in December 2007 discloses a random anti-collision algorithm combining Bit-Slot and ID-Slot. First, the tag randomly selects a slot feedback 1-bit acknowledgment command, and the return information of all tags constitutes a string of length L, and the reader sends L-c0 QueryRep commands after the empty slot is eliminated, and the tag is in the time slot. The corresponding time slot of the counter feeds back its own ID code, and the reader determines whether a collision occurs according to the received ID code; the reader recognizes the tag and counts the number of collision time slots and the number of successful time slots; if the tag is not After the identification is completed, the reader then opens the next frame to continue identifying the tags until all the tags are identified. The invention uses the Bit-slot method to reduce the time overhead of the empty time slot, and uses the shorter QueryRep instruction instead of the longer "unique code" confirmation command in the Bit-Slot, which can effectively improve the multi-tag recognition speed.

3) The Chinese invention patent (CN1591041) filed by Shanghai Fudan Microelectronics Co., Ltd. in August 2003 discloses a method for identifying the anti-collision of the HF RFID system. The system comprises a reader and at least one transponder, characterized in that Wireless communication is established between the reader and the transponder using a particular form of wireless signal consisting of a logic signal portion and a time slot portion for transmitting various commands or information to the transponder by the reader, The time slot portion is used by the transponder for backscatter modulation to transmit a one-bit acknowledgement signal to the reader; based on wireless communication, the reader causes the transponder to initially initiate by sending a corresponding command and/or message to the transponder The status, general query status, general search status, wait status, and acknowledge status are converted accordingly and the reader's search and/or query actions are performed on the transponder to complete the reader's identification of the transponder. The invention solves the problem of synchronization of the previous binary search method and improves the anti-interference performance.

4) Shanghai Fudan Microelectronics Co., Ltd. applied for the Chinese invention patent (CN101464940) in December 2008, which discloses a multi-label anti-collision algorithm, which includes: clearing; the reader sends a tag query command; the transponder is docked The query command is judged; the reader receives the tag query response, and judges; the reader performs data processing on the transponder; the pd value is set to 1, the Q value is set to Q; the reader sends the query change command transponder The post-receiver receives the tagged tag query response and judges; the reader/writer performs data processing on the transponder, and the algorithm can cycle in a quick exclusion manner, which has high actual recognition efficiency for conflicting tags and can be quickly reduced. The number of transponders in the working range of the reader improves the recognition efficiency by rapidly reducing the number of transponders, and on the other hand can reduce the interference of the electromagnetic environment within the working range of the reader to further improve the recognition quality.

1) Chinese invention patent (CN101281614) applied by Peking University Shenzhen Graduate School in April 2008 discloses a demodulation circuit for UHF RFID chip, including envelope detection circuit and envelope shaping circuit, antenna receiving The RF signal passes through the envelope detection circuit and the envelope shaping circuit in turn and is processed into an S signal and a Sav signal output to the comparator. The envelope shaping circuit includes a bleeder resistor, a diode, a filter resistor and a filter capacitor, and the bleeder resistor is connected in the package. Between the signal output end of the detection circuit and the ground, the diode anode is connected to the signal output end of the envelope detection circuit, the cathode is connected to one end of the parallel branch formed by the filter resistor and the filter capacitor, and the other end of the parallel branch is grounded, wherein The signal output end of the envelope detection circuit is the S signal output end, and the connection point of the diode cathode and the parallel branch formed by the filter resistor and the filter capacitor is the Sav signal output end. The invention realizes the coexistence of low power consumption and low cost of the demodulation circuit of the UHF radio frequency identification chip.

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