Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Flexible resistive film frequency selective surface, preparation method and application thereof

A frequency-selective surface and resistive film technology, which is applied in the direction of resistor manufacturing, resistors, and resistors manufactured by photolithography, can solve the problems of limited application range, complicated process, and slow engraving speed of engraving machines, so as to achieve mature technology and easy operation. Simple and effective in meeting the needs of wave-absorbing design

Active Publication Date: 2019-09-17
HUAZHONG UNIV OF SCI & TECH
View PDF14 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The traditional FSS manufacturing process is completed by engraving with an engraving machine, which requires the thickness of the copper clad laminate substrate, otherwise there will be the possibility of being drilled through, which limits the flexibility requirements of FSS; The size of the progress path is closely related, and it is often difficult to meet the target requirements; the operation layout of the engraving machine is limited, which limits the size of the FSS; the engraving speed of the engraving machine is slow, and it is often only possible to complete a piece of FSS with a size of 500mm*500mm in one day
[0005] FSS patterns are generally made by processing copper clad laminates (FR4, PTFE, etc.), and then electronic components need to be welded on the copper flexible frequency selective surface. The process is complicated and the cycle is long
In actual application, there is often a curved surface environment. At present, the production of flexible FSS is limited to a small area, and the application range is limited, such as the application on the cylindrical antenna of the communication system.
And the traditional copper frequency selective surface is prone to wrinkle and seam problems

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Flexible resistive film frequency selective surface, preparation method and application thereof
  • Flexible resistive film frequency selective surface, preparation method and application thereof
  • Flexible resistive film frequency selective surface, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0036] A method for preparing a flexible resistive film frequency selective surface provided by the invention comprises the following steps:

[0037] (1) Printing the set frequency selective surface pattern on the photosensitive film, and the photosensitive film is pasted on the surface of the flexible medium substrate to obtain the photosensitive film printed with the frequency selective surface pattern.

[0038] (2) sequentially exposing and developing the photosensitive film printed with the frequency-selective surface pattern, developing and removing part of the photosensitive film, revealing the frequency-selective surface pattern on the surface of the flexible medium substrate, and obtaining the developed flexible medium substrate;

[0039] (3) Coating resistive conductive carbon paste on the surface of the flexible medium substrate after the development, sintering and curing the flexible medium substrate of the coated conductive carbon paste, and the cured conductive car...

Embodiment 1

[0065] for preparation figure 2 Frequency-selective surface patterning of the flexible resistive film of the pattern shown. The length of the pattern multiplied by the width is 180mm*180mm. The preparation method of this embodiment comprises the following steps:

[0066] S1: Cropped slightly larger than figure 2 For 0.15mm thick FR4 with the size shown, a layer of photosensitive blue film is pasted on the surface through a laminating machine; the thickness of the photosensitive blue film is 0.2mm.

[0067] 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;

[0068] S3: Transfer the designed FSS pattern to FR4 coated with blue film through a large-scale printing machine;

[0069] S4: exposing the flexible FR4 with the frequency selective surface pattern transferred;

[0070] S5: Prepare the developing solution, plac...

Embodiment 2

[0076] for preparation image 3 Frequency-selective surface patterning of the flexible resistive film of the pattern shown. The length of the pattern multiplied by the width is 300mm*300mm. The preparation method of this embodiment comprises the following steps:

[0077] S1: Cropped slightly larger than figure 2 For FR4 with a thickness of 0.15mm in the size shown, a layer of photosensitive blue film is pasted on the surface through a laminating machine; the thickness of the photosensitive blue film is 0.15mm.

[0078] 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;

[0079] S3: Transfer the designed FSS pattern to FR4 coated with blue film through a large-scale printing machine;

[0080] S4: exposing the flexible FR4 with the frequency selective surface pattern transferred;

[0081] S5: Configure a sodium bicarb...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Thicknessaaaaaaaaaa
Thicknessaaaaaaaaaa
Login to View More

Abstract

The invention belongs to the field of flexible FSS radar wave-absorbing structures, and more particularly to a flexible resistive film frequency selective surface, a preparation method and application thereof. The method comprises the steps of: printing a set frequency selective surface pattern on a photosensitive film, and attaching the photosensitive film to the surface of a flexible dielectric substrate; successively exposing and developing the photosensitive film on which the frequency selective surface pattern is printed in order to expose the frequency selective surface pattern on the surface of the flexible dielectric substrate; coating the surface of the developed flexible dielectric substrate with resistive conductive carbon paste, and sintering and curing the flexible dielectric substrate coated with the conductive carbon paste, wherein the cured conductive carbon paste is a resistive film; demolding the cured flexible dielectric substrate, removing the photosensitive film and the resistive film on the surface of the flexible dielectric substrate to obtain the flexible resistive film frequency selective surface. The FSS surface preparation method of the invention is simple, and can produce a large-area flexible passive resistive film frequency selective surface applied to a curved surface.

Description

technical field [0001] The invention belongs to the field of flexible FSS radar wave-absorbing structures, and more specifically relates to a flexible resistive film frequency selective surface, its preparation method 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 wil...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): H01Q15/00H01Q17/00H01C17/00H05K9/00
CPCH01C17/003H01Q15/006H01Q15/0066H01Q17/00H01Q17/007H05K9/0086
Inventor 江建军别少伟贺云缪灵何凡
Owner HUAZHONG UNIV OF SCI & TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com