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Planar one-way antenna assembly and realizing method thereof

A unidirectional antenna and implementation method technology, applied in the field of radio frequency identification, can solve problems such as the limitations of RFID tags, and achieve the effect of reducing frequency dependence

Inactive Publication Date: 2013-04-17
SHANGHAI HUAHONG JITONG SMART SYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] The purpose of the present invention is to provide a planar unidirectional antenna assembly and its implementation method to solve the limitations of existing RFID tags in the application of book management and assembly line item management, etc.

Method used

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  • Planar one-way antenna assembly and realizing method thereof
  • Planar one-way antenna assembly and realizing method thereof
  • Planar one-way antenna assembly and realizing method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0057] Please continue to refer figure 2 , it can be seen from the figure that the reflector 220 is rectangular, and its long side is along the direction of the antenna.

[0058] It should be noted that when the reflector 220 gets closer to the antenna 210, the front-to-back gain difference will become smaller and smaller, and the applicable frequency range (that is, the frequency band where the front-to-back gain difference is greater than a certain threshold) becomes narrower, and the gain difference These two parameters, frequency range, are more and more sensitive to the surrounding environment (that is, when the surrounding objects move or the material changes, these two parameters may change sharply). For the widened reflector 220 in this embodiment, generally when the distance D between the edge of the widened reflector 220 and the edge of the tag antenna is less than 10 mm, it is difficult to obtain an ideal unidirectional antenna effect.

[0059] Therefore, in order...

Embodiment 2

[0061] Since the structure of the antenna is not the key of the present invention, the antenna is omitted here for the sake of clarity, and only the structure of the reflector is given.

[0062] Please refer to image 3 , the antenna assembly also includes an antenna and a reflector 320. The difference from Embodiment 1 is that the reflector 320 is replaced by a rectangular reflector with a crescent-shaped reflector on one side, that is, the side edge of the reflector 320 close to the antenna is an arc shape. Due to the recess in the middle, the total width of the reflector and the antenna can be reduced while keeping the average distance between the edge of the reflector 320 and the edge of the antenna approximately constant, thereby achieving the effect of reducing the overall size of the antenna assembly. For example, the overall width of the antenna assembly in this embodiment is reduced by about 15 mm compared with the antenna assembly in Embodiment 1.

Embodiment 3

[0064] Please refer to Figure 4 , the antenna assembly also includes an antenna 310 and a reflector 320 , one side of the reflector 320 has a hollow structure 330 . However, the present invention is not limited thereto.

[0065] The main function of adding a hollow structure on the reflector is to increase the equivalent distributed inductance of the reflector to adjust and improve the superposition of the reflected electromagnetic wave and the electromagnetic wave emitted by the antenna itself, so as to ensure that a smaller label size is similar to a large-size label. Unidirectional antenna effect.

[0066] The hollow structure 330 is located on the side of the reflector 320 close to the antenna, and is in the shape of a long and narrow strip, and its direction is substantially parallel to the edge of the reflector 320 on this side. The width of the narrow strip hollow and the distance from it to the edge should be smaller than the average width of the reflector. Specific...

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Abstract

The invention discloses a planar one-way antenna assembly and a realizing method thereof. A reflector is arranged on one side of an antenna, and has a certain width on a direction vertical to the antenna. The width of the reflector is increased (namely, the size of the reflector on the direction vertical to a dipole-similar antenna is increased) to ensure that the dependency of the antenna one-way performance to the frequency can be remarkably reduced so that the one-way characteristic is kept within a larger frequency range. In a UHF RFID (Ultra High Frequency Radio Frequency Identification) working frequency band near 900MHz, the width of more than 4mm of the reflector can ensure the frequency adaption range of more than 100MHz (the difference of gains before and behind the antenna is more than 6dB). The specific starting and ending frequency values of the frequency applicable range can be regulated through regulating the distance between the reflector and the dipole-similar antenna and the length of the reflector.

Description

technical field [0001] The invention relates to the technical field of radio frequency identification (RFID), in particular to a planar unidirectional antenna component applied to an electronic label and a realization method thereof. Background technique [0002] Radio Frequency Identification (RFID) technology is a non-contact automatic identification technology. It automatically identifies the target object and obtains relevant data through radio frequency signals. The identification work does not require manual intervention and can work in various harsh environments. [0003] The RFID system is a simple wireless system used to control, detect and track objects. It consists of two basic devices, namely an interrogator (or reader) and a transponder (or electronic tag). The electronic tag is mainly composed of storage It consists of a large-scale integrated circuit chip with an identification code and a transceiver antenna. The number of electronic tags can be multiple, that...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01Q19/10H01Q19/12
Inventor 董培良
Owner SHANGHAI HUAHONG JITONG SMART SYST
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