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A flexible resistive film-metal composite frequency selective surface, its preparation and application

A technology of frequency selective surface and resistive film, which is applied in the manufacture of resistors, resistors, and resistors through photolithography, etc., can solve the problems that FSS absorbers cannot withstand high temperatures, shorten the preparation cycle of FSS absorbers, etc., and achieve shortening The effect of preparation cycle, expanding the scope of engineering application, and good impedance matching

Active Publication Date: 2021-01-19
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the above defects or improvement needs of the prior art, the present invention provides a flexible resistive film-metal composite frequency selective surface, its preparation and application, which combines the flexible resistive film and the metal frequency selective surface by using screen printing technology , the resistance film is used to replace the lumped devices welded in the traditional FSS absorber, which greatly simplifies the preparation process of the FSS absorber, shortens the preparation cycle of the FSS absorber, and effectively improves its working stability. This solves the technical problem that the existing FSS absorber cannot withstand high temperature

Method used

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  • A flexible resistive film-metal composite frequency selective surface, its preparation and application
  • A flexible resistive film-metal composite frequency selective surface, its preparation and application
  • A flexible resistive film-metal composite frequency selective surface, its preparation and application

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preparation example Construction

[0034] A method for preparing a flexible resistive film-metal composite frequency selective surface provided by the invention, such as figure 1 shown, including the following steps:

[0035] S1: Paste the photosensitive film with the frequency-selective surface pattern printed on the surface on the flexible copper-clad board, and perform exposure and development in sequence to obtain the developed flexible copper-clad plate, revealing the copper surface and the frequency-selective surface pattern;

[0036] S2: Etching the developed flexible copper-clad laminate to obtain the etched flexible copper-clad laminate; the etching is to remove the copper on the copper surface to reveal the surface of the copper-clad laminate substrate, while retaining the laminated copper-clad laminate a photosensitive film on a copper plate exhibiting a predetermined frequency selective surface pattern;

[0037] S3: Perform stripping and drying treatment on the etched flexible copper clad laminate ...

Embodiment 1

[0057] It is used to prepare single-sided flexible resistance film-metal composite FSS. The length of the pattern multiplied by the width is 600mm*600mm, figure 2 It is a resistive film type FSS pattern, image 3 Metallic FSS pattern. The preparation method of this embodiment comprises the following steps:

[0058] S1: Cut out 0.15mm thick FR4 with a length multiplied by width of 650mm*650mm, and apply a layer of photosensitive blue film on the surface through a laminating machine; the thickness of the photosensitive blue film is 0.2mm.

[0059] S2: processed by AutoCAD and Photoshop to get figure 2 In the printing pattern of FSS, the FSS pattern is printed on the film slightly larger than the size of the FSS pattern through a large inkjet printer;

[0060] S3: Transfer the designed FSS pattern to the FR4 with the blue film through the large-scale printing machine;

[0061] S4: exposing the flexible FR4 with the frequency selective surface pattern transferred;

[0062]...

Embodiment 2

[0068] It is used to prepare double-sided flexible resistance film-metal composite FSS. The length of the pattern multiplied by the width is 600mm*600mm, Figure 4 For metal type FSS pattern, Figure 5 It is a resistive film type FSS pattern. The preparation method of this embodiment comprises the following steps:

[0069] S1: Cut out 0.15mm thick FR4 with a length multiplied by width of 650mm*650mm, and apply a layer of photosensitive blue film on the surface through a laminating machine; the thickness of the photosensitive blue film is 0.2mm.

[0070] S2: processed by AutoCAD and Photoshop to get figure 2 In the printing pattern of FSS, the FSS pattern is printed on the film slightly larger than the size of the FSS pattern through a large inkjet printer;

[0071] S3: Transfer the designed FSS pattern to the FR4 with the blue film through the large-scale printing machine;

[0072] S4: exposing the flexible FR4 with the frequency selective surface pattern transferred;

...

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Abstract

The invention belongs to the field of flexible FSS wave-absorbing structures, and particularly relates to a flexible resistive film-metal composite frequency selective surface and a preparation and application thereof. A photosensitive film printed with a frequency selective surface pattern on the surface is attached to a flexible copper-clad plate, and exposing and developing are carried out in sequence to obtain a developed flexible copper-clad plate; the developed flexible copper-clad plate is etched to obtain an etched flexible copper-clad plate; the etched flexible copper-clad plate is de-molded and dried; a frequency selective surface pattern with a copper surface is obtained after de-molding; conductive carbon paste is extruded from the meshes of a silk-screen printing plate to thesurface or back of the de-molded flexible copper-clad plate by adopting a silk-screen printing technology, and a resistive film is obtained after sintering and curing; and a flexible resistive film-metal composite frequency selective surface is obtained. The preparation method provided by the invention is simple to operate, and can be used to prepare a large-area flexible resistive film-metal composite FSS applied to a curved surface.

Description

technical field [0001] The invention belongs to the field of flexible FSS wave-absorbing structures, and more specifically relates to a flexible resistance film-metal composite frequency selective surface, its preparation and application. Background technique [0002] Frequency Selective Surface (FSS: Frequency Selective Surface) is a device with periodic results, which can selectively reflect, absorb or transmit incident electromagnetic waves. Structurally speaking, FSS is divided into patch type and aperture type, which exhibit band-stop and band-pass characteristics for electromagnetic waves, respectively. FSS is widely used in the microwave field because of its selective properties for incident electromagnetic waves. [0003] In the field of electromagnetic wave absorption technology, the new wave absorbing structure based on FSS can realize broadband absorption and effectively absorb electromagnetic wave energy. In the field of electromagnetic shielding, mobile phones...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01Q15/00H01Q17/00H01C17/00H05K9/00
CPCH01C17/003H01Q15/006H01Q15/0066H01Q17/00H01Q17/007H01Q17/008H05K9/0088
Inventor 江建军贺云缪灵别少伟黄泽
Owner HUAZHONG UNIV OF SCI & TECH
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