UHF smart shelf rfid reader antenna

A technology of ultra-high frequency bands and readers, which is applied to antennas, antenna supports/mounting devices, and structural forms of radiation elements, etc., can solve the problems of insufficient antenna size, widening of the width, and weakening of the antenna's operating distance, etc., to achieve Uniform distribution of magnetic field to offset the effect of attenuation

Inactive Publication Date: 2011-12-28
NORTHWESTERN POLYTECHNICAL UNIV
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

These antennas are still not large enough to generate a large uniformly distributed EMF over a large area
The document "RFID Smart Shelf with Confined Detection Volume at UHF, Carla R. Mederios, Jorge R. Costa, and Carlos A. Fernandes, IEEE Antennas and Wireless Propagation Letters, 2008, Vol.7, p773-776" discloses a The shelf antenna realized by the microstrip line, the length of the antenna can be changed freely, but the width cannot be widened
Document "Near-Field Antenna for RFID Smart She

Method used

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  • UHF smart shelf rfid reader antenna
  • UHF smart shelf rfid reader antenna
  • UHF smart shelf rfid reader antenna

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Embodiment Construction

[0012] refer to Figure 1~3 , the present invention consists of a coaxial connector 1, an upper PCB substrate 2, a lower PCB substrate 3, an upper surface metal conduction strip 4, a lower surface metal conduction strip 5, a conductive column 6, a nylon column 7, an air gap 8, a matching load 9 and the whole Copper clad 10 components.

[0013] In this embodiment, the width of the upper PCB substrate 2 and the lower PCB substrate 3 is 350mm, the length is 700mm, the thickness is 2mm, and the material is FR4. The two PCB substrates are supported by nylon pillars 6 with a height of 10 mm at the four corners to form an air gap 8 .

[0014] The width of the first metal guide strip on the left side is 52mm, and the width on the right side is 55mm; the width of the second metal guide strip on the left side is 55mm, and the width on the right side is 58mm; The width of the guide belt 4 on the left is 58 mm, and the width on the right is 62 mm. In this way, the characteristic impeda...

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Abstract

The invention discloses an antenna for an ultra-high frequency band intelligent shelf RFTD reader. The upper PCB substrate and the lower PCB substrate are supported by nylon columns; There are multiple lower surface metal conduction strips, and the upper surface is copper-clad as a whole; the coaxial street, the upper surface metal conduction strip, the lower surface metal conduction strip and the matching load are connected in series through conductive columns, and the width of the upper surface metal conduction strip is according to the signal transmission The order gradually increases, and the sum of the phase shifts generated by the adjacent single upper surface metal conduction band and the single lower surface metal conduction band is an integer multiple of the wavelength. The invention has strong current, can conveniently design antennas with different areas, and the magnetic field on the upper part of the antenna is evenly distributed.

Description

technical field [0001] The invention belongs to the technical field of antenna structure design and relates to an RFID reader-writer antenna. Background technique [0002] RFID (Radio Frequency Identification, radio frequency identification) technology is a non-contact automatic identification technology. Reader antennas play a key role in RFID systems. The operating frequency of the reader antenna may be low frequency (below 135kHz), high frequency (13.56MHz), ultra-high frequency (860-960MHz) and microwave frequency band (above 2.4GHz). Reader antennas are divided according to the operating distance, which can be divided into near-field antennas and far-field antennas. Near-field reader antennas operating at UHF are ideal for working in tight spaces. Because the near-field antenna only has a strong electromagnetic field at a short distance, and the strength of the electromagnetic field weakens sharply at a slightly further distance, the far-field gain of this antenna is...

Claims

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Application Information

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IPC IPC(8): H01Q1/38H01Q13/08H01Q1/22
Inventor 吴昌英任安康王婷李建周
Owner NORTHWESTERN POLYTECHNICAL UNIV
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