CN108232465B - Device and method for eliminating edge scattering - Google Patents
Device and method for eliminating edge scattering Download PDFInfo
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- CN108232465B CN108232465B CN201810050866.1A CN201810050866A CN108232465B CN 108232465 B CN108232465 B CN 108232465B CN 201810050866 A CN201810050866 A CN 201810050866A CN 108232465 B CN108232465 B CN 108232465B
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- 238000000034 method Methods 0.000 title claims abstract description 16
- 239000006260 foam Substances 0.000 description 3
- 239000002131 composite material Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000001629 suppression Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q17/00—Devices for absorbing waves radiated from an antenna; Combinations of such devices with active antenna elements or systems
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Abstract
The invention discloses a device and a method for eliminating edge scattering. The device comprises a wedge, wherein a resistor plate is arranged on the sharp-end edge of the wedge, and the resistor plate is formed by sequentially butting a plurality of parallel resistor discs; the resistance value of each resistance chip is gradually reduced in the direction close to the tip of the wedge. The method of the invention corresponds to the device. The invention can greatly reduce RCS caused by edge scattering in the range of 1-18 GHz, has simple structure and is suitable for practical application.
Description
Technical Field
The invention belongs to the technical field of aircraft stealth, and particularly relates to a device and a method for eliminating edge scattering.
Background
On a scattering body, several scattering sources are present, the different types of scattering sources contributing differently to the radar scattering cross section of the scattering body. According to the intensity of the echo, common scattering sources are specular reflection, edge scattering, traveling wave echo, creeping wave echo, pinnate diffraction, surface profile discontinuity and the like. Edge scattering is a strong source of scattering next to specular reflection.
The elimination of edge scatter is of great practical significance, for example, in the case of hundreds of edges in an aircraft, the stealth capability of the aircraft can be severely affected if the edges are not well treated. Researchers have conducted research into this. For example, as early as 1991, Mavywua et al (Mavywua et al, non-specular scattering edge contribution and suppression thereof, journal of electronics science, 1991, 13(4): 430-. Loading a resistor sheet on an edge is a more effective way to eliminate edge scattering, for example, document 2 (lu-juan, etc., edge scattering suppression method based on composite loading of wave-absorbing foam and graded impedance strips, invention patent, application publication No. CN103985967A ] reduces RCS caused by edge scattering by about 15dB at a frequency point of 4GHz by composite loading of wave-absorbing foam and graded impedance strips. However, what effect the graded impedance strip plays is, and particularly, the wave-absorbing foam or the graded impedance strip plays a dominant role in eliminating edge scattering, and no analysis is made in document 2. Document 2 shows that edge scattering can be reduced by loading a resistance strip with a graded resistance value on an edge, but a graded resistance card is difficult to process and has a limited resistance value variation range, which limits the practical application of the resistance card. Meanwhile, document 2 only realizes RCS reduction at a single frequency point of 4GHz, and does not realize edge scattering reduction in a broadband range of 1 to 18 GHz.
Disclosure of Invention
The invention aims to provide a device and a method for eliminating edge scattering, which aim to eliminate the edge scattering of a target body to the maximum extent and achieve the aim of anti-radar stealth of an aircraft.
The invention is realized in this way, a device for eliminating edge scattering, the device includes a wedge, a resistance plate is arranged on the edge of the tip end of the wedge, the resistance plate is formed by sequentially butting a plurality of sections of parallel resistance cards; the resistance value of each resistance chip is gradually reduced in the direction close to the tip of the wedge.
Preferably, the resistance value of the resistance sheet is between 0 and 10000 Ω/□, and the width of each resistance sheet is 0 to 100 mm.
Preferably, the height of the wedge is 300mm, the width of the wedge is 200mm, and the included angle between the two inclined planes of the tip is 30 degrees;
the height of the resistance plate is 300mm, and the width of each resistance sheet is 20 mm.
Preferably, the resistance sheets comprise a first resistance sheet, a second resistance sheet and a third resistance sheet, the first resistance sheet, the second resistance sheet and the third resistance sheet are sequentially connected in the direction close to the tip of the wedge, and the resistance values of the first resistance sheet, the second resistance sheet and the third resistance sheet are respectively 760 Ω/□, 183 Ω/□ and 60 Ω/□.
The invention further discloses a method for eliminating edge scattering, which comprises the steps of arranging a resistance plate on the sharp pointed edge of the wedge, and reducing RCS (residual stress) caused by edge scattering in a wide frequency range of 1-18 GHz; wherein,
the resistance plate is formed by sequentially butting a plurality of parallel sections of resistance sheets; the resistance value of each resistance chip is gradually reduced in the direction close to the tip of the wedge.
Preferably, the resistance value of the resistance sheet is between 0 and 10000 Ω/□, and the width of each resistance sheet is 0 to 100 mm.
Preferably, the height of the wedge is 300mm, the width of the wedge is 200mm, and the included angle between the two inclined planes of the tip is 30 degrees;
the height of the resistance plate is 300mm, and the width of each resistance sheet is 20 mm.
Preferably, the resistance sheets comprise a first resistance sheet, a second resistance sheet and a third resistance sheet, the first resistance sheet, the second resistance sheet and the third resistance sheet are sequentially connected in the direction close to the tip of the wedge, and the resistance values of the first resistance sheet, the second resistance sheet and the third resistance sheet are respectively 760 Ω/□, 183 Ω/□ and 60 Ω/□.
The invention overcomes the defects of the prior art and provides a device and a method for eliminating edge scattering.
Compared with the defects and shortcomings of the prior art, the invention has the following beneficial effects: the invention can greatly reduce RCS caused by edge scattering in the range of 1-18 GHz, has simple structure and is suitable for practical application.
Drawings
FIG. 1 is a schematic structural diagram of an apparatus for eliminating edge scattering in an embodiment of the present invention;
fig. 2 is a comparison of RCS before and after the wedges load the resistive plates in an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The invention discloses a device for eliminating edge scattering, which comprises a wedge, wherein a resistance plate is arranged on the edge at the tip end of the wedge, and the resistance plate is formed by sequentially butting a plurality of sections of parallel resistance cards; the resistance value of each resistance chip is gradually reduced in the direction close to the tip of the wedge.
In the embodiment of the invention, the wedge is a triangular wedge and comprises a tip, two inclined planes and a cylindrical tail, wherein the two inclined planes are intersected at the same side end to form a tip edge, and the other same side ends of the two inclined planes are tangent to the cylindrical tail. For such wedges, after an electromagnetic wave having an electric field direction parallel to the edge of the wedge is incident on the wedge, scattering at the edge of the wedge is a major source of RCS.
In the embodiment of the invention, the edge is loaded with the resistance plate, the resistance plate is formed by sequentially connecting a plurality of resistance sheets with gradually changed resistance values, the resistance values of the resistance sheets are different, the resistance values of the resistance sheets are changed within the range of 0-10000 omega/□, the resistance values are smaller as the resistance sheets are closer to the wedge, in addition, the width of each resistance sheet is changed within the range of 0-100 mm, and the change is generally required to be matched with the actual size of the wedge.
In the embodiment of the present invention, more specifically, for convenience of illustration, as shown in fig. 1, fig. 1 is a schematic structural diagram of a device for eliminating edge scattering in the embodiment of the present invention. The resistor sheet is divided into three segments, and any segment larger than 1 can be used in practice. As a specific example, the resistance values of the three sections of resistance sheets are respectively set to be 60 omega/□, 183 omega/□ and 760 omega/□, the width of each section of resistance sheet is 20mm, and the height of the resistance plate is 300 mm; the height of wedge is 300mm, and the width is 200mm, and the contained angle between two inclined planes at most tip is 30.
The above specific example was verified, and as shown in fig. 2, fig. 2 is a comparison graph of RCS before and after loading the resistor plate with the wedge in the embodiment of the present invention. As can be seen from FIG. 2, the RCS of the wedge not loaded with the resistance card with the gradually-changed resistance is about-15 dB in the range of 1-18 GHz; after the resistance chip with the gradually-changed resistance is loaded, the RCS of the wedge is reduced to-23 dB to-43 dB, the RCS is reduced by 8.6 to 28.4dB, and the average RCS is reduced by 18 dB. Obviously, RCS caused by edge scattering can be greatly reduced in a wide frequency range of 1-18 GHz by loading the resistance card with the gradually-changed resistance value.
The invention can greatly reduce RCS caused by edge scattering in the range of 1-18 GHz, has simple structure and is suitable for practical application.
The invention further discloses a method for eliminating edge scattering, which comprises the steps of arranging a resistance plate on the sharp pointed edge of the wedge, and reducing RCS (residual stress) caused by edge scattering in a wide frequency range of 1-18 GHz; the resistance plate is formed by sequentially butting a plurality of parallel sections of resistance sheets; the resistance value of each resistance chip is gradually reduced in the direction close to the tip of the wedge.
The method of the present invention corresponds to the above-mentioned apparatus of the present invention, and the detailed description of the apparatus in the embodiment of the present invention can be used for explaining the method of the present invention, and is not repeated herein.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (1)
1. A method for eliminating edge scattering is characterized in that a device used in the method comprises a wedge, and the method is characterized in that a resistance plate is arranged on the edge at the tip end of the wedge, and RCS caused by edge scattering is reduced in a wide frequency range of 1-18 GHz; wherein,
the resistance plate is formed by sequentially butting a plurality of parallel sections of resistance sheets; the resistance value of each resistance chip is gradually reduced in the direction close to the tip of the wedge;
the resistance value of the resistance sheet is 0-10000 omega/□, and the width of each resistance sheet is 0-100 mm;
the height of the wedge is 300mm, the width of the wedge is 200mm, and the included angle between the two inclined planes at the tip end is 30 degrees;
the height of the resistance plate is 300mm, and the width of each resistance sheet is 20 mm;
the resistance card comprises a first resistance card, a second resistance card and a third resistance card, wherein the first resistance card, the second resistance card and the third resistance card are sequentially connected in the direction close to the pointed end of the wedge, and the resistances of the first resistance card, the second resistance card and the third resistance card are respectively 760 omega/□, 183 omega/□ and 60 omega/□.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810050866.1A CN108232465B (en) | 2018-01-18 | 2018-01-18 | Device and method for eliminating edge scattering |
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| CN201810050866.1A CN108232465B (en) | 2018-01-18 | 2018-01-18 | Device and method for eliminating edge scattering |
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| Publication Number | Publication Date |
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| CN108232465A CN108232465A (en) | 2018-06-29 |
| CN108232465B true CN108232465B (en) | 2021-04-23 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR101286091B1 (en) * | 2009-12-07 | 2013-07-15 | 한국전자통신연구원 | Multi-Directional Resonant Type Electromagnetic Wave Absorber, Method for Adjusting Electromagnetic Wave Absorption Performance Using the same and Manufacturing Method of the same |
| CN103985967B (en) * | 2014-05-12 | 2016-06-29 | 电子科技大学 | Based on the edge scatter suppressing method inhaling ripple foam and gradual change impedance strip Combined Loading |
| CN206401527U (en) * | 2017-01-20 | 2017-08-11 | 武汉灵动时代智能技术股份有限公司 | A kind of Meta Materials stealth structure |
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