Antenna-free radio-frequency electronic tag and design method thereof

Abstract

The invention discloses an antenna-free radio-frequency electronic tag and a design method thereof. The radio-frequency electronic tag comprises a metal object and an excitation structure, wherein the excitation structure is arranged on the surface of the metal object non-destructively or embedded in the metal object and used for exciting a radiation characteristic of the metal object; and the excitation structure is namely the electronic tag. Certain specific excitation structures are designed non-destructively and are arranged in certain specific positions of the surface of the metal object or embedded in metal and used for exciting a specific-mode current of a metal structure to realize effective radiation of the excitation structures and the metal object. The tag is simple to process, low in cost and long in operating distance; the excitation structure can be repeatedly used, so that economy and environmental protection are achieved; and the tag is hidden and attractive, and has the advantages of metal resistance, long reading / writing distance, high stability and the like.

Description

technical field [0001] The invention relates to an antennaless radio frequency electronic tag and a design method thereof. Background technique [0002] Radio Frequency Identification (RFID) is a wireless communication technology that can identify specific targets and read and write related data through radio signals without the need for mechanical or optical contact between the identification system and specific targets. According to the ISO / IEC 18000 series standards formulated by the International Organization for Standardization (ISO), the radio frequency identification technology UHF system mainly works at 902-928 MHz, the frequency bands in China are 840-845 MHz and 920-925 MHz, and the frequency bands in Europe are 865-867MHz . Passive RFID system has many advantages such as low cost, high communication rate, multi-tag identification, etc., which has attracted the attention of the industry. It is recognized as the RFID technology with the most application potential. ...

AI Technical Summary

Problems solved by technology

However, for ordinary passive UHF tags, when they are attached to a metal surface, due to changes in the impedance matching, distribution radiation efficiency, and directivity of the tag antenna, the reading distance of the tag decreases rapidly, and it is even difficult to be read.

Traditional anti-metal tags usually adopt the form of microstrip antennas. Although microstrip antennas have high gain, the manufacture of tag antennas is complicated, the size is large, and the bandwidth is narrow. It is difficult to achieve conjugate matching with the chip.

Images