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Wave absorber and preparation method thereof

A wave absorber and metal sheet technology, applied in antennas, electrical components, etc., can solve the problems of large size, poor wave absorption performance, narrow wave absorption bandwidth, etc., to achieve wide wave absorption bandwidth, excellent wave absorption performance, and reduce production. cost effect

Pending Publication Date: 2022-06-21
CAINIAO SMART LOGISTICS HLDG LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The application provides a wave absorber to solve the problems in the prior art that the wave-absorbing bandwidth in the UHF band is narrow, the wave-absorbing performance is poor and the size is large when it is obliquely incident at a large angle

Method used

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  • Wave absorber and preparation method thereof
  • Wave absorber and preparation method thereof
  • Wave absorber and preparation method thereof

Examples

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no. 1 example

[0035] Please refer to figure 1 , which is a schematic structural diagram of an embodiment of the wave absorber of the present application. In this embodiment, the wave absorber includes: at least one metal patch, and the metal patch includes: an annular metal sheet 1 located on the outer layer, and a plurality of annular metal sheets located in the annular metal sheet 1 Petal metal sheet 2. The wave absorber also includes: at least one resistive film 3 , a dielectric layer 4 and a metal base plate 5 .

[0036] The metal patch, the resistive film 3, the dielectric layer 4 and the metal base plate 5 are arranged in order from top to bottom. The metal patch and the resistive film 3 constitute the absorber surface structure. The metal patch covers the surface of the dielectric layer 4 , and the resistive film 3 can be placed in the metal patch to form electrical communication with the plurality of petal-shaped metal sheets 2 . The backside of the dielectric layer 4 is attache...

no. 2 example

[0050] In the above-mentioned embodiment, a wave absorber is provided, and correspondingly, the present application also provides a preparation method of the wave absorber. The method corresponds to the embodiment of the above-mentioned product. Since the method embodiment is basically similar to the product embodiment, the description is relatively simple, and the relevant part may refer to the partial description of the product embodiment. The method embodiments described below are merely illustrative.

[0051] The application additionally provides a method for preparing a wave absorber, comprising:

[0052] Step 1: cover the surface of the dielectric layer with a metal patch by a metal etching process, the metal patch includes: a ring-shaped metal sheet, and a plurality of petal-shaped metal sheets placed in an annular shape in the ring-shaped metal sheet;

[0053] Step 2: connecting the resistive film and the plurality of petal-shaped metal sheets to form electrical comm...

no. 3 example

[0057] In the above-mentioned embodiment, a wave absorber is provided, and correspondingly, the present application also provides a radio frequency identification system. The radio frequency identification system corresponds to the above-mentioned embodiment of the wave absorber. Since the system embodiment is basically similar to the product embodiment, the description is relatively simple, and the relevant part may refer to the partial description of the product embodiment. The system embodiments described below are merely illustrative.

[0058] The present application further provides a radio frequency identification system, comprising: the above-mentioned wave absorber, in addition to an RFID reader, and an electronic tag. RFID reader, namely radio frequency identification technology, this technology is usually used for wireless transmission and reception. RFID readers are widely used in various fields, such as: manufacturing, logistics, ports, docks, vehicles and person...

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Abstract

The invention discloses a wave absorber, a wave absorber preparation method and a radio frequency identification system. The wave absorber comprises at least one metal patch, at least one resistive film, a dielectric layer and a metal bottom plate, the metal patch comprises an annular metal sheet and a plurality of petal-shaped metal sheets which are annularly placed in the annular metal sheet; the surface of the dielectric layer is covered with the metal patch, the resistive film is connected with the petal-shaped metal sheets to form electrical communication, and the back face of the dielectric layer is attached to the metal bottom plate. When UHF frequency band electromagnetic waves are obliquely incident to the wave absorber at a large angle, the electromagnetic waves firstly make contact with the metal patch layer, the outer-layer annular metal sheet and the inner-layer petal-shaped metal sheets in the pattern layer generate strong electromagnetic resonance at the adjacent frequency, the dielectric layer and the metal bottom plate are combined to form a cavity, and most of electromagnetic wave energy is consumed at the cavity. Therefore, the wave absorber has the advantages of being wide in UHF frequency band wave absorbing bandwidth, high in wave absorbing performance during large-angle oblique incidence, small in size and the like.

Description

technical field [0001] The present application relates to the technical field of microwave devices, in particular to a wave absorber and a method for preparing the wave absorber. Background technique [0002] Radio Frequency Identification (RFID) technology is the key technology for object identification in the Internet of Things. When the RFID system is applied in practice, especially in the indoor environment, due to the problems of multiple reflections and interference in the indoor wireless communication environment, problems such as misidentification of tags will arise. This interference needs to be controlled in order to improve the wireless communication environment, especially the problem of multipath effects, so as to establish a reliable RFID system. In practical applications, absorbing materials are mainly used to absorb electromagnetic waves reflected in the environment around the RFID system. [0003] Taking the RFID system working in the American standard wor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01Q17/00
CPCH01Q17/008
Inventor 颜力耿明扬陈昊徐润东
Owner CAINIAO SMART LOGISTICS HLDG LTD
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