Single-port feed dual-polarized far-field/near-field antenna for forklift reader

Abstract

The invention relates to a single-port feed dual-polarized far-field / near-field antenna for a forklift reader. The single-port feed dual-polarized far-field / near-field antenna comprises a bent metal wire, an open metal ring, a feed probe and a bottom metal plate, wherein the bent metal wire and the open metal ring are fixed over the bottom metal plate by support columns, and form an air cavity with the bottom metal plate; the feed probe is connected between the bottom metal plate and the bent metal wire; the open metal ring is arranged around the bent metal wire, and is formed by a plurality of arcs spaced apart; the adjacent arcs are spaced apart from each other on the horizontal surface to form a T-shaped structure; the bent metal wire comprises a first zigzag metal wire, a second zigzagmetal wire; the first zigzag metal wire and the second zigzag metal wire are connected end to end and are repeatedly bent a plurality of times; and the bending direction of the first m zigzag metal wire and the bending direction of the second zigzag metal wire are perpendicular to each other. The antenna of the invention has multiple polarization directions, and takes into account the special effects of far-field and near-field communication, and has good electromagnetic performance.

Description

technical field [0001] The invention relates to the field of tobacco warehousing and logistics RFID, in particular to a single-port feeding dual-polarization far-field / near-field antenna for a forklift reader. Background technique [0002] RFID is a wireless communication technology for radio frequency identification. There is no need to establish mechanical or optical contact between the identification system and a specific target. It uses radio signals to identify specific targets and read and write related data. RFID devices are devices that use this communication technology, including RFID chips and RFID readers. [0003] At present, on the basis of traditional data collection technologies such as barcodes, the tobacco industry uses RFID to facilitate and quick operation, large data storage capacity, fast reading speed, and strong ability to resist complex environments. RFID application systems include logistics subsystems, Information management subsystem, data acquisi...

AI Technical Summary

Problems solved by technology

Common reader antennas radiate towards the front of the antenna, but the metal plate behind the antenna and the metal arm below the antenna will affect the communication direction of the reader antenna

In addition, the plastic pallet superimposed on the metal arm will also affect the antenna; through field tests, we found that during the storage and transshipment of tobacco by the forklift, the position of the forklift is moving at any time, resulting in the reading head antenna and pallet labels on the forklift / The relative position of the buried tag is not fixed, and the polarization direction of the tag antenna (horizontal polarization) and the reader's reading head antenna polarization direction (vertical polarization) are easily mismatched, which seriously affects the communication distance between the reading head and the tag , and the read rate of the corresponding tag

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