Electronic tag antenna

Abstract

The invention provides an electronic tag antenna suitable for ISO18000-6 / B / C and EPC GEN2 electronic tag standards and with high length-width ratio dimension property. Based on the conventional dipole antenna, branches of three types are loaded in the antenna, namely 1) an L-shaped bent branch is loaded at two ends respectively, 2) a loop branch is loaded on two sides of a middle feed point respectively, and 3) a vertical branch (22) is loaded between the middle feed point and the two ends respectively. By loading the three branches, high length-width ratio of the antenna can be achieved under the condition of meeting high antenna gain; and meanwhile, the real part and the virtual part of antenna impedance can be independently adjusted by changing the dimension of individual branches so that the impedance of different RFID chips can be adapted. The electronic tag antenna has a simple structure, flexible and adjustable characteristic impedance and high length-width ratio, and is suitable to be used in an environment with special limitation on the dimension of a tag; after dimension adjustment, the antenna structure can be used for UHF frequency range or microwave frequency range, and achieves good match with chips of numerous ASIC manufacturers at home and abroad.

Description

technical field [0001] The invention belongs to the technical field of antennas and relates to radio frequency identification (RFID) technology, in particular to an electronic tag antenna suitable for ISO18000-6 / B / C and EPC GEN2 electronic tag standards and having high aspect ratio size characteristics. Background technique [0002] Radio Frequency Identification (RFID) technology is a technology that uses radio frequency to automatically identify targets and obtain relevant data through non-contact two-way communication. It is currently one of the most popular intelligent identification technologies. A typical RFID system mainly includes three parts: the tag, the reader and the host control system. Among them, the performance of the tag plays an important role in the entire RFID system, accounting for more than 65% of the cost. The antenna design, which is an important part of the tag, is particularly important. important. [0003] Different from ordinary resonant antennas...

AI Technical Summary

Problems solved by technology

[0005] figure 1 It is an ordinary dipole antenna. This type of antenna has a specific length for a specific operating frequency, and its impedance is relatively fixed, but it cannot meet the variable ASIC impedance matching requirements; figure 2 In order to simply fold the dipole antenna, this type of antenna can partially make up for the lack of antenna impedance adjustability, but when the bending distance of the antenna is limited, the reactance component of the impedance usually presents capacitive in the UHF frequency band, which cannot satisfy most Matching requirements of ASIC chips; image 3 It is a dipole antenna with ring-shaped stubs loaded in the middle. The ring-shaped stubs loaded by this type of antenna are inductive to the center-balanced feed dipole, but the overall length of the antenna is too long. When the bending distance is limited, the impedance adjustability will also be affected. limit

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