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Broadband radio frequency identification reader-writer antenna with wide circularly polarized wave beam

A radio frequency identification, circular polarization technology, applied in antennas, resonant antennas, electrical short antennas, etc., can solve the problems of narrow circularly polarized beams and application scenarios that are not suitable for large-scale identification, and achieve improved impedance matching performance, good Circular polarization performance, light weight effect

Active Publication Date: 2020-10-16
DALIAN MARITIME UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing circularly polarized reader antennas have narrow circularly polarized beams, and can only identify tags within a small beam range near the maximum radiation direction, which is not suitable for large-scale identification applications.

Method used

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  • Broadband radio frequency identification reader-writer antenna with wide circularly polarized wave beam
  • Broadband radio frequency identification reader-writer antenna with wide circularly polarized wave beam
  • Broadband radio frequency identification reader-writer antenna with wide circularly polarized wave beam

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Embodiment Construction

[0031] In order to make the technical solutions and advantages of the present invention more clear, the technical solutions in the embodiments of the present invention are clearly and completely described below in conjunction with the drawings in the embodiments of the present invention:

[0032] Such as Figure 1-Figure 5 A broadband radio frequency identification reader antenna with a circularly polarized beam width shown specifically includes the following structure: a triangular defect radiation patch 1, a circular coupling patch 2, a grounding probe 3, a feeding probe 4, a feeding probe Electrical network 5, dielectric board 6, metal floor 7, coaxial connector 8 and shorting pin 9;

[0033] The triangular defect radiation patch 1 includes four triangular defect radiation patches I11, triangular defect radiation patch II12, triangular defect radiation patch III13 and triangular defect radiation patch IV14 with the same structure; the triangular defect radiation patch I11 ...

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Abstract

The invention discloses a broadband radio frequency identification reader-writer antenna with a wide circularly polarized beam. The antenna comprises triangular defect radiation patches, a circular coupling patch, a grounding probe, a feed probe, a feed network, a dielectric plate, a metal floor, a coaxial connector and a short-circuit pin. According to the structure, the cross-shaped gap betweenthe triangular defect radiation patches is used for radiation to broaden the circularly polarized beam width of the antenna; the grounding probe effectively reduces the sizes of the triangular defectradiation patches; the impedance matching performance of the antenna is improved by the gap capacitance between the triangular defect radiation patches and the circular coupling patch; the introduction of the air layer improves the bandwidth of the antenna; the feed network based on the hybrid ring and the TRD coupler eliminates the mutual coupling influence between the triangular defect radiationpatches, and achieves good circular polarization performance.

Description

technical field [0001] The invention relates to the technical field of antennas, in particular to a broadband radio frequency identification reader antenna with a circularly polarized beam width. Background technique [0002] Radio Frequency Identification (RFID) is a non-contact automatic identification technology through radio frequency signals. With the market demand and the continuous development of UHF RFID technology, RFID products are widely used in logistics management, intelligent tracking, smart cards, animal tags, electronic toll collection and store security and other fields. Among the various antennas that can be used for UHF RFID system readers, the patch antenna has been more researched and applied due to its advantages of low cost, small size, light weight, easy processing, and flexible feeding structure. [0003] The antenna is a bridge to realize the information transmission between the radio frequency tag and the reader. The antenna of the RFID reader is ...

Claims

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Application Information

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IPC IPC(8): H01Q1/22H01Q1/36H01Q1/38H01Q1/48H01Q1/50H01Q9/04H01P5/18
CPCH01P5/184H01Q1/2216H01Q1/36H01Q1/38H01Q1/48H01Q1/50H01Q9/0407H01Q9/0428
Inventor 王钟葆王雅楠祝子辉房少军刘宏梅周芸
Owner DALIAN MARITIME UNIVERSITY
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