CN102570047A - Edge progressive impedance loading film and edge progressive impedance loading structure - Google Patents
Edge progressive impedance loading film and edge progressive impedance loading structure Download PDFInfo
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- CN102570047A CN102570047A CN2011104167787A CN201110416778A CN102570047A CN 102570047 A CN102570047 A CN 102570047A CN 2011104167787 A CN2011104167787 A CN 2011104167787A CN 201110416778 A CN201110416778 A CN 201110416778A CN 102570047 A CN102570047 A CN 102570047A
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- 230000000750 progressive effect Effects 0.000 title claims abstract description 48
- 230000000295 complement effect Effects 0.000 claims abstract description 9
- 239000005030 aluminium foil Substances 0.000 claims description 54
- 239000012528 membrane Substances 0.000 claims description 14
- 230000010287 polarization Effects 0.000 abstract description 29
- 230000000737 periodic effect Effects 0.000 abstract description 6
- 238000002360 preparation method Methods 0.000 abstract description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 abstract description 3
- 229910052782 aluminium Inorganic materials 0.000 abstract description 3
- 239000012776 electronic material Substances 0.000 abstract description 2
- 230000005764 inhibitory process Effects 0.000 abstract description 2
- 239000011888 foil Substances 0.000 abstract 2
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- 238000011160 research Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000004411 aluminium Substances 0.000 description 1
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- 238000003754 machining Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
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Abstract
An edge gradual impedance loading structure and a preparation method thereof belong to the technical field of electronic materials. The resistance film is provided with progressive periodic square aluminum foil patches and progressive periodic hole units which are complementary with the patches, the side lengths of the progressive square aluminum foil units and the hole units are respectively 8mm, 5mm, 2mm and 10mm, and the unit interval, namely the period is L. The invention can obtain good edge scattering inhibition when the frequency, the polarization mode and the azimuth angle change.
Description
Technical field
The invention belongs to technical field of electronic materials, particularly the electromagnetic scattering of edge electromagnetism defective suppresses mechanism and preparation method thereof.
Background technology
Since World War II, controlled the research emphasis that relevant stealth technology has become countries in the world with the back scattering of objective body electromagnetism.Along with the fast development of modern military technology, the detection of the defense system of each major country of the world, tracking and attacking ability are more and more stronger, and the threat that makes the prominent anti-armament systems in various countries face is more and more serious, and various countries have competitively developed stealth technology for this reason.Radar system is a most effective up to now target acquisition instrument in the military field, and it judges the character of target to the scattering of radar wave according to target.The RCS of target (RCS) is the key factor of Radar Target Features; It is the basic index of weighing the target detectivity; The core of stealth technology is exactly to reduce the RCS of target as far as possible, thereby reduces the probability of being found by the enemy radar detection system, improves its penetration ability.So stealth technology depends on the research to target RCS to a great extent again.
For the orthodox flight device, specular scattering source, angle body, cavity become main scattering source.But for stealthy aircraft; Above-mentioned main scattering source has obtained effective control; The electromagnetic scattering of entablement rank, slit, edge grade scattering source has but become main scattering source; Therefore, the scattering mechanism of this type of time scattering source and the research of reducing measure thereof have just been become very urgent task.The edge scatter inhibition scheme of comparative maturity is to adopt the edge sawtoothization at present; It is a kind of method of effectively reducing RCS through the shaping design; But; When slight the variation taken place at the azimuth, its edge scatter suppressed effect and obviously descends, and big vibration regularly can occur and considerably beyond not through the RCS of the target of edge sawtoothization when the azimuth reaches one.Therefore be necessary edge scatter control problem is studied again, press for a kind of method that suppresses edge scatter that obtains, when frequency, azimuth and polarization mode change, still can access good edge and suppress effect.
Summary of the invention
Technical problem to be solved by this invention is to provide the progressive impedance in a kind of edge to load and preparation method thereof, and the edge scatter of the objective body wave structure of loading can be effectively suppressed in the frequency, polarization mode and the azimuth that change.
The technical scheme that the present invention solve the technical problem employing is; The progressive impedance in edge loads film; It is characterized in that; On Impedance Membrane, be provided with aluminium foil paster and unit, hole by ranks, each row comprise progressive periodicity aluminium foil paster and with its complementary unit, progressive periodicity hole, arranging of each row is identical; The aluminium foil patch shape of each row, measure-alike, the hole cell configuration of each row, measure-alike, each column alignment.
Further, said aluminium foil paster and unit, hole are all square.The central point distance of adjacent aluminium foil paster equates that the central point distance of adjacent holes unit equates that to both sides, the size in aluminium foil paster and hole increases gradually from the centre position.
Further, to both sides, the length of side of first order aluminium foil paster and unit, first order hole is all 2mm from the centre position; The length of side of second level aluminium foil paster and unit, hole, the second level is all 5mm; The length of side of third level aluminium foil paster and unit, third level hole is all 8mm, and the central point distance of adjacent aluminium foil paster is 10mm, and the central point distance of adjacent unit, hole is 10mm;, the distance of first order aluminium foil paster and unit, first order hole is 10mm.
Perhaps, said aluminium foil paster and unit, hole are all circle, from the centre position to both sides; The radius of first order aluminium foil paster and unit, first order hole is all 1mm; The radius of second level aluminium foil paster and unit, hole, the second level is all 2.5mm, and the radius of third level aluminium foil paster and unit, third level hole is all 4mm, and the central point distance of adjacent aluminium foil paster is 10mm; The central point distance of adjacent unit, hole is 10mm, and the distance of first order aluminium foil paster and unit, first order hole is 10mm.
The aforementioned first order, the second level, the third level are with size classification from small to large.
The present invention also provides a kind of progressive impedance loading structure in edge that the progressive impedance in aforesaid edge loads film that has; It is characterized in that; The progressive impedance in edge loads the straight edge that film is pressed close to objective body; Direction is: the aluminium foil paster is near the straight edge part of objective body, the straight edge part of unit, hole wide body.
The present invention has following outstanding advantage:
Existing Impedance Membrane realizes that more easily side's resistance Standard resistance range is wide; Technology is simple, workable, and cost is lower; When frequency, polarization mode and azimuthal variation, can obtain good edge scatter suppresses.Graphic element size through reasonable adjustment aluminium foil paster and hole can obtain good edge scatter and suppress effect.The graphic element in aluminium foil paster and hole can adopt other complementary periodic structure unit to replace.The electromagnetic scattering that this structure can be used to not have the through hole class slit of ground plate suppresses.
Description of drawings
Fig. 1 is the objective body structural representation.
Fig. 2 is a structural representation of the present invention.
Fig. 3 is along the structural representation of the progressive impedance unit of X-X among Fig. 2.Wherein a, b, c are the paster of gradual change and the length of side in hole, and the cycle is L.
Fig. 4 is the progressive impedance unit structural representation of circular cycle complementation unit.
Among the figure, 1 is the aluminium foil paster, and 2 is the unit, hole, and 3 is Impedance Membrane.
Embodiment
The present invention provides a kind of edge progressive impedance loading structure, is on Impedance Membrane, to introduce progressive complementary periodic structure to constitute.The Impedance Membrane impedance is 300 Ω/◇, and periodic structure adopts the square paster and the square hole of complementary structure.
The alleged complementation of the present invention is meant shape, measure-alike, and the position symmetry.
The alleged periodic structure of the present invention is meant that the central point distance of adjacent arbitrarily Unit two (aluminium foil paster or hole) is identical, is all one-period length, is called L.Special, in the centre position, the distance of the central point of the unit, hole that aluminium foil paster that size is minimum and size are minimum also is L.
The objective body that the present invention handles is that 1mm is thick, and area is that the aluminium sheet of 400mm * 400mm cuts along diagonal, chamfers then, needing to obtain the edge of processing.Its basic structure is as shown in Figure 1.
The progressive impedance loading structure in edge of the present invention can prepare through following method:
The first step: prepare wide w, the Impedance Membrane that length is corresponding with objective body, its impedance is 300 Ω/◇.Through the method for machinery Impedance Membrane is processed then, be respectively a, b and c from the square hole length of side in several three cycles on one side, their cycle is 10mm.Second step: prepare the aluminium foil of wide 30mm, its thickness is less than 0.1mm.Through the method for machinery aluminium foil is carved then, processed three rows and the cycle be 10mm, the square patch length of side is respectively a, b and c.The paster of carving out can not separate with aluminium foil integral body immediately, for next step aligning is prepared.The 3rd step: the aluminium foil of processing is sticked on the another side of the machining hole of Impedance Membrane, and just 30mm is wide.Then the aluminium foil paster is partly cemented, and remove unnecessary aluminium foil.It is as shown in Figure 2 finally to obtain progressive Impedance Membrane, comprising the coordinate system of electromagnetic wave incident.The structural representation of a progressive impedance unit that obtains along X-X is as shown in Figure 3.
The maximum aluminium foil paster in unit of the present invention is near the objective body edge, and one side that promptly equiva lent impedance is little contacts with loaded edge.
Impedance bar width of the present invention can proper extension in the direction with paster, is convenient to combine closely with the objective body edge, directly thin Impedance Membrane is sticked on the objective body of metal, and metallicity can not change.
The sign that edge scatter of the present invention suppresses is reduced effect with the monostatic radar cross section (RCS) in the present invention and is characterized, with the same target body not the load condition station RCS that places an order compare and obtain.
Embodiment 1:
The progressive impedance loading structure in a kind of edge is on Impedance Membrane, to paste its complementary unit, progressive periodicity hole of progressive square aluminium foil paster of periodicity and engraving to constitute.The progressive square aluminium foil unit and unit, the hole length of side are respectively a=8mm, and b=5mm, c=2mm, unit interval are to be L=10mm in the cycle.
The progressive impedance loading structure in the edge of present embodiment is primarily aimed at the wide-angle condition of incidence, and does not consider in the design for the specular scattering situation.To perpendicular polarization and two kinds of situation of horizontal polarization;, azimuth
carry out pitching angle theta scanning under changing from-45 °～45 °; Pitching angle theta is changed to-90 °～90 °, and wherein the definition of the azimuth and the angle of pitch is as shown in Figure 2.In the incident of 10GHz plane wave; When the azimuth was 0 °: the guided wave leading edge obtained maximum RCS and reduces and be 28dB under the horizontal polarization situation when pitching angle theta is 30 ° of left and right sides; Obtaining maximum RCS when-30 ° of left and right sides in the trailing edge pitching angle theta reduces and is 38dB; In whole angle of pitch excursion-90 °～90 °, can both obtain RCS and reduce, obtain good RCS and reduce effect in polarizers of big angle scope-90 °～-30 ° of scopes especially, trailing edge reduces effect and obviously is superior to leading edge; The guided wave leading edge obtains maximum RCS and reduces and be 35dB under the perpendicular polarization situation when pitching angle theta is 30 ° of left and right sides, obtains maximum RCS during for-30 ° of left and right sides in the trailing edge pitching angle theta and reduces and be 30dB.In whole angle of pitch excursion-90 °～90 °, can both obtain RCS and reduce, obtain good RCS in 30 °～90 ° scopes of polarizers of big angle scope especially and reduce effect, leading edge is reduced effect and obviously is superior to trailing edge.
In the incident of 10GHz plane wave; When the azimuth was 10 °: the guided wave leading edge obtained maximum RCS and reduces and be 24dB under the horizontal polarization situation when pitching angle theta is 50 ° of left and right sides; Trailing edge RCS reduces DeGrain; Reduce effect but all obtained RCS in whole scanning angle of pitch scope, obtain preferably in polarizers of big angle scope-90 °～-45 ° of scopes that RCS reduces effect especially, trailing edge reduces effect and obviously is superior to leading edge; The RCS of guided wave leading edge and trailing edge reduces the effect basically identical under the perpendicular polarization situation, and leading edge RCS reduces effect and slightly is superior to trailing edge, and the RCS that in ± 15 °～± 90 ° scopes, on average obtains about 10dB at the angle of pitch reduces effect.
In the incident of 10GHz plane wave; When the azimuth was 15 °: the guided wave leading edge obtained maximum RCS and reduces and be 20dB under the horizontal polarization situation when pitching angle theta is 40 ° of left and right sides; Trailing edge RCS reduces DeGrain; Reduce effect but all obtained RCS in whole scanning angle of pitch scope, obtain preferably in polarizers of big angle scope-90 °～-40 ° of scopes that RCS reduces effect especially, trailing edge reduces effect and obviously is superior to leading edge; The RCS of guided wave leading edge and trailing edge reduces the effect basically identical under the perpendicular polarization situation, and trailing edge RCS reduces effect and slightly is superior to trailing edge, and the RCS that in ± 20 °～± 90 ° scopes, on average obtains about 10dB at the angle of pitch reduces effect.Other situation under azimuth
changes from-45 °～45 °; Along with the azimuth is departed from 0 °; Reduce effect variation gradually, two kinds of polarization variation tendency basically identicals.The perpendicular polarization situation of change is less than horizontal polarization.All there is certain RCS to reduce effect in whole angular domain.Occur the anti-situation of reducing in the time of edge sawtooth structure can not occurring and depart from 0 °, and occur a plurality of secondary lobe situation when surpassing particular value at the azimuth.
Embodiment 2:
The progressive impedance loading structure in a kind of edge is on Impedance Membrane, to paste the circular aluminium foil paster of progressive periodicity to constitute with its complementary unit, progressive periodicity hole of engraving.Progressive circular aluminium foil unit and hole cell radius are respectively r1=4mm, and r2=2.5mm, r3=1mm, unit interval are to be L=10mm in the cycle.
Present embodiment is primarily aimed at the wide-angle condition of incidence, and does not consider in the design for the specular scattering situation.To perpendicular polarization and two kinds of situation of horizontal polarization;, azimuth
carry out pitching angle theta scanning under changing from-45 °～45 °; Pitching angle theta is changed to-90 °～90 °, and wherein the definition of the azimuth and the angle of pitch is as shown in Figure 2.In the incident of 10GHz plane wave; When the azimuth was 0 °: the guided wave leading edge obtained maximum RCS and reduces and be 20dB under the horizontal polarization situation when pitching angle theta is 35 ° of left and right sides; When the trailing edge pitching angle theta is-28 ° of left and right sides, obtain RCS and reduce peak 20dB; In whole angle of pitch excursion-90 °～90 °, can both obtain RCS and reduce, obtain good RCS and reduce effect in polarizers of big angle scope-90 °～-25 ° of scopes especially, trailing edge reduces effect and obviously is superior to leading edge; The guided wave leading edge obtains maximum RCS and reduces and be 25dB under the perpendicular polarization situation when pitching angle theta is 50 ° of left and right sides, obtains RCS in the trailing edge pitching angle theta during for-58 ° of left and right sides and reduces peak 20dB.In whole angle of pitch excursion-90 °～90 °, can both obtain RCS and reduce, obtain good RCS in 25 °～90 ° scopes of polarizers of big angle scope especially and reduce effect, leading edge is reduced effect and obviously is superior to trailing edge.Other angular domains under azimuth
changes from-45 °～45 °; Along with the azimuth is departed from 0 °; Reduce effect variation gradually, two kinds of polarization variation tendency basically identicals.The perpendicular polarization situation of change is less than horizontal polarization.All there is certain RCS to reduce effect in whole angular domain.Occur the anti-situation of reducing in the time of edge sawtooth structure can not occurring and depart from 0 °, and occur a plurality of secondary lobe situation when surpassing particular value at the azimuth.RCS under the corresponding situation reduces effect not as embodiment 1.Main cause be the circular cell area less than rectangular cells, the progressive impedance operator of being constructed is not as rectangular cells.
Embodiment 3:
The progressive impedance loading structure in a kind of edge is on Impedance Membrane, to paste its complementary unit, progressive periodicity hole of progressive square aluminium foil paster of periodicity and engraving to constitute.The progressive square aluminium foil unit and unit, the hole length of side are respectively a=8.5mm, and b=5.5mm, c=1.5mm, unit interval are to be L=10mm in the cycle.
The progressive impedance loading structure in edge through said mode design obtains is primarily aimed at the wide-angle condition of incidence, and does not consider in the design for the specular scattering situation.To perpendicular polarization and two kinds of situation of horizontal polarization;, azimuth
carry out pitching angle theta scanning under changing from-45 °～45 °; Pitching angle theta is changed to-90 °～90 °, and wherein the definition of the azimuth and the angle of pitch is as shown in Figure 2.In the incident of 10GHz plane wave; When the azimuth was 0 °: the guided wave leading edge obtained maximum RCS and reduces and be 22dB under the horizontal polarization situation when pitching angle theta is 35 ° of left and right sides; When the trailing edge pitching angle theta is-35 ° of left and right sides, obtain RCS and reduce peak 28dB; In whole angle of pitch excursion-90 °～90 °, can both obtain RCS and reduce, obtain good RCS and reduce effect in polarizers of big angle scope-90 °～-30 ° of scopes especially, trailing edge reduces effect and obviously is superior to leading edge; The guided wave leading edge obtains maximum RCS and reduces and be 30dB under the perpendicular polarization situation when pitching angle theta is 50 ° of left and right sides, obtains RCS in the trailing edge pitching angle theta during for-50 ° of left and right sides and reduces peak 22dB.In whole angle of pitch excursion-90 °～90 °, can both obtain RCS and reduce, obtain good RCS in 30 °～90 ° scopes of polarizers of big angle scope especially and reduce effect, leading edge is reduced effect and obviously is superior to trailing edge.Other angular domains under azimuth
changes from-45 °～45 °; Along with the azimuth is departed from 0 °; Reduce effect variation gradually, two kinds of polarization variation tendency basically identicals.The perpendicular polarization situation of change is less than horizontal polarization.All there is certain RCS to reduce effect in whole angular domain.Occur the anti-situation of reducing in the time of edge sawtooth structure can not occurring and depart from 0 °, and occur a plurality of secondary lobe situation when surpassing particular value at the azimuth.RCS under the corresponding situation reduces effect not as embodiment 1.Main cause is that first rectangular cells area reduces, and back both direction cellar area increases, and causes progressive gradient to change to cause.
Above-mentioned three progressive impedance loading structures in the described edge of embodiment, its preparation method is all identical with the preparation method described in the summary of the invention, no longer repeats at this.
Claims (6)
1. the progressive impedance in edge loads film, it is characterized in that, on Impedance Membrane, is provided with aluminium foil paster and unit, hole by ranks, each row comprise progressive periodicity aluminium foil paster and with its complementary unit, progressive periodicity hole, arranging that each is capable is identical; The aluminium foil patch shape of each row, measure-alike, the hole cell configuration of each row, measure-alike, each column alignment.
2. the progressive impedance loading structure in edge as claimed in claim 1 is characterized in that said aluminium foil paster and unit, hole are all square.
3. the progressive impedance in edge as claimed in claim 1 loads film, it is characterized in that, the central point distance of adjacent aluminium foil paster equates that the central point distance of adjacent holes unit equates that to both sides, the size in aluminium foil paster and hole increases gradually from the centre position.
4. the progressive impedance in edge as claimed in claim 2 loads film; It is characterized in that to both sides, the length of side of first order aluminium foil paster and unit, first order hole is all 2mm from the centre position; The length of side of second level aluminium foil paster and unit, hole, the second level is all 5mm; The length of side of third level aluminium foil paster and unit, third level hole is all 8mm, and the central point distance of adjacent aluminium foil paster is 10mm, and the central point distance of adjacent unit, hole is 10mm;, the distance of first order aluminium foil paster and unit, first order hole is 10mm.
5. the progressive impedance in edge as claimed in claim 1 loads film; It is characterized in that said aluminium foil paster and unit, hole are all circle, from the centre position to both sides; The radius of first order aluminium foil paster and unit, first order hole is all 1mm; The radius of second level aluminium foil paster and unit, hole, the second level is all 2.5mm, and the radius of third level aluminium foil paster and unit, third level hole is all 4mm, and the central point distance of adjacent aluminium foil paster is 10mm; The central point distance of adjacent unit, hole is 10mm, and the distance of first order aluminium foil paster and unit, first order hole is 10mm.
6. have the progressive impedance loading structure in edge that the progressive impedance in the described edge of claim 1 loads film; It is characterized in that; The progressive impedance in edge loads the straight edge that film is pressed close to objective body; Direction is: the aluminium foil paster is near the straight edge part of objective body, the straight edge part of unit, hole wide body.
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| CN201110416778.7A CN102570047B (en) | 2010-12-15 | 2011-12-14 | Edge progressive impedance loading film and edge progressive impedance loading structure |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104659494B (en) * | 2013-11-20 | 2017-10-17 | 电子科技大学 | The gradual change impedance material of broadband edge scatter control |
| CN116683190A (en) * | 2023-06-25 | 2023-09-01 | 成都飞机工业（集团）有限责任公司 | Preparation method of graded impedance film and product thereof |
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|---|---|---|---|---|
| US20020171578A1 (en) * | 2001-05-16 | 2002-11-21 | General Dynamics Land Systems, Inc. | Non-skid, radar absorbing system, its method of making, and method of use |
| US20100097048A1 (en) * | 2007-01-04 | 2010-04-22 | Werner Douglas H | Passive detection of analytes |
| CN101847766A (en) * | 2010-05-17 | 2010-09-29 | 北京航空航天大学 | Novel complementary type frequency selection surface with stable incident angle |
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2011
- 2011-12-14 CN CN201110416778.7A patent/CN102570047B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020171578A1 (en) * | 2001-05-16 | 2002-11-21 | General Dynamics Land Systems, Inc. | Non-skid, radar absorbing system, its method of making, and method of use |
| US20100097048A1 (en) * | 2007-01-04 | 2010-04-22 | Werner Douglas H | Passive detection of analytes |
| CN101847766A (en) * | 2010-05-17 | 2010-09-29 | 北京航空航天大学 | Novel complementary type frequency selection surface with stable incident angle |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104659494B (en) * | 2013-11-20 | 2017-10-17 | 电子科技大学 | The gradual change impedance material of broadband edge scatter control |
| CN116683190A (en) * | 2023-06-25 | 2023-09-01 | 成都飞机工业（集团）有限责任公司 | Preparation method of graded impedance film and product thereof |
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Address after: 610054 No. 288, west section of Wenming street, new economic Industrial Park, south area of Chengdu modern industrial port, Pidu District, Chengdu, Sichuan Patentee after: Chengdu Jiachi Electronic Technology Co.,Ltd. Address before: 610054 No. 288, west section of Wenming street, new economic Industrial Park, south area of Chengdu modern industrial port, Pidu District, Chengdu, Sichuan Patentee before: CHENGDU JIACHI ELECTRONIC TECHNOLOGY Co.,Ltd. |
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