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A kind of flexible graded resistance film, its preparation method and application

A resistive film and flexible technology, applied in the direction of resistance manufacturing, resistors, resistors manufactured by photolithography, etc., can solve the problems of single material, too small size, increase the radar scattering cross section of the application structure, etc., and achieve simple operation and mature technology , reducing the effect of increasing the radar cross section

Active Publication Date: 2020-06-02
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation of the sample material is single, the size is too small and other defects, which limit the application of the resistance film
[0007] The preparation of wave-absorbing skin by traditional patch technology is easy to cause a large number of folds and seams, resulting in the destruction of the periodic continuity of the surface shape of the application structure, increasing the radar scattering cross section of the application structure, and deteriorating the stealth effect of the application structure

Method used

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  • A kind of flexible graded resistance film, its preparation method and application
  • A kind of flexible graded resistance film, its preparation method and application

Examples

Experimental program
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Effect test

preparation example Construction

[0038] A method for preparing a flexible gradient resistance film provided by the present invention is prepared in a manner similar to a printed circuit board, and specifically includes the following steps:

[0039] S1: Print the set gradient resistance film pattern on the photosensitive film to obtain a photosensitive film printed with the gradient resistance film pattern;

[0040] S2: Paste the photosensitive film printed with the gradient resistive film pattern on the flexible copper clad plate, and then perform exposure and development in sequence to obtain the developed flexible copper clad plate, in which the area of ​​the photosensitive film that has not been illuminated is removed by development, revealing the copper quality On the surface, the photosensitive film in the illuminated area is retained, revealing the pattern of the gradient resistance film;

[0041] S3: Etching the developed flexible copper clad laminate to obtain the etched flexible copper clad laminate;...

Embodiment 1

[0067] a kind of like figure 2 The pattern of the gradient resistance film shown is a pattern whose length multiplied by width is 600mm×261mm. Its preparation method comprises the following steps:

[0068] S1: Through AutoCAD processing, get figure 2 The printing pattern of the gradient resistance film in the middle is to print the set gradient resistance film pattern on the film through a large inkjet printer;

[0069] S2: Cropped slightly larger than figure 2 0.15mm thick FR4 copper clad laminate with the size shown, and the photosensitive blue film is pasted on the flexible copper clad laminate;

[0070] S3: transfer the pattern on the film to the flexible copper clad board covered with photosensitive blue film;

[0071] S4: Expose the patterned flexible copper clad laminate with a printing machine;

[0072] S5: Prepare a developing solution to develop the exposed flexible copper clad laminate, wherein the photosensitive film area that is not illuminated is removed ...

Embodiment 2

[0081] A flexible gradient resistance film, the pattern of which is 600mm×261mm in length by width. Its preparation method comprises the following steps:

[0082] S1: Through AutoCAD processing, the printing pattern of the gradient resistance film is obtained, and the set gradient resistance film pattern is printed on the film through a large inkjet printer;

[0083] S2: Cropped slightly larger than figure 2 A 0.025mm thick PI film copper clad laminate with the indicated size, and a photosensitive blue film is pasted on the flexible copper clad laminate;

[0084] S3: transfer the pattern on the film to the flexible copper clad board covered with photosensitive blue film;

[0085] S4: Expose the patterned flexible copper clad laminate with a printing machine;

[0086] S5: Prepare a developing solution to develop the exposed flexible copper clad laminate to reveal the copper-free partial pattern of the gradient resistance film;

[0087] S6: Etching the developed flexible co...

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Abstract

The invention belongs to the field of flexible graded resistive film wave-absorbing materials, and more particularly to a flexible graded resistive film, a preparation method and application thereof. The method comprises the steps of: printing a set graded resistive film pattern on a photosensitive film, then attaching the photosensitive film to a flexible copper-clad plate, and successively exposing and developing the flexible copper-clad plate; etching the developed flexible copper-clad plate; coating the surface of the etched flexible copper-clad plate with a paste-like resistive film, and curing the paste-like resistive film by sintering; demolding the sintered flexible copper-clad plate, removing the photosensitive film and the resistive film on the surface thereof to expose the copper surface of the set graded resistive film pattern; partially etching the exposed copper surface of the set graded resistive film pattern to remove a part of the copper surface, wherein the part where the copper surface is removed exposes the surface of the copper-clad plate substrate, the part where the copper surface is not removed still remains, and the surface of the remaining area is the resistive film such that a complete flexible graded resistive film is obtained.

Description

technical field [0001] The invention belongs to the field of flexible gradient resistance film wave-absorbing materials, and more specifically relates to a flexible gradient resistance film, its preparation method and application. Background technique [0002] Gradient resistive film is an array structure in which the unit size and period spacing change as a function of position, and has the function of reflecting, absorbing or transmitting incident electromagnetic waves. Similar to the frequency selective surface (FSS: Frequency SelectiveSurface). [0003] By gradually changing the geometric shape of the continuous unit, the gradient resistance film can obtain the gradient change of the impedance characteristic, realize the smooth transition from the metal impedance to the free space impedance, thereby reducing the reflection problem caused by the impedance discontinuity, and can effectively reduce the radar scattering cross section . [0004] Gradient resistive film patt...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01Q15/00H01Q17/00H05K9/00H01C17/00
CPCH01C17/003H01Q15/006H01Q15/0066H01Q17/00H01Q17/007H05K9/0086
Inventor 江建军别少伟缪灵贺云李芮
Owner HUAZHONG UNIV OF SCI & TECH
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