Miniaturized high-gain anti-metal tag antenna based on dielectric resonator

Abstract

The invention belongs to the field of radio frequency identification and antennas, and mainly relates to a miniaturized high-gain anti-metal tag antenna, which comprises a dielectric resonator and a metal circular ring. The metal circular ring is arranged above the dielectric resonator, the tag antenna also comprises a tag chip, and the metal circular ring is provided with an opening structure used for installing the tag chip. The invention provides a miniaturized high-gain anti-metal tag antenna. The miniaturized high-gain anti-metal tag antenna mainly comprises a dielectric resonator and a metal circular ring. The antenna works in a HEM11 mode by selecting the shape and the size of the dielectric resonance structure, and the dielectric resonance structure and the mode can effectively reduce the size of the antenna and can be installed on the metal surface. The size of the antenna can be further reduced by adjusting the size of the metal circular ring, and meanwhile conjugate matchingwith a tag chip can be smoothly achieved. Wherein the tag antenna collects energy in the space to activate the tag chip, and the tag chip realizes backward scattering communication by adjusting impedance at two ends of an access antenna of the tag chip.

Description

technical field [0001] The invention belongs to the field of radio frequency identification and antennas, and more specifically relates to a dielectric resonator-based miniaturized high-gain anti-metal tag antenna. Background technique [0002] Compared with traditional barcode technology, RFID tags have the advantages of long sensing distance, large amount of information, high recognition efficiency, fast reading, and reusability. At present, RFID tags of different frequencies have been widely used in logistics, transportation and other fields. But in real life, we often encounter interference from various environments, the most important of which are metal and liquid environments. The reading distance of ordinary tag antennas will drop sharply if placed in a metal or liquid environment, which will affect the normal operation of the RFID system. Therefore, a metal-resistant tag antenna specially designed to work normally in a metal environment is required. [0003] At th...

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Problems solved by technology

The inverted F structure of the traditional anti-metal antenna has high gain, but it has high requirements on the shape and narrow bandwidth, which is not suitable for today's wide variety of logistics fields

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