CN103457035B - Two arc-shaped curved surface microwave absorbing materials - Google Patents
Two arc-shaped curved surface microwave absorbing materials Download PDFInfo
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- CN103457035B CN103457035B CN201310425292.9A CN201310425292A CN103457035B CN 103457035 B CN103457035 B CN 103457035B CN 201310425292 A CN201310425292 A CN 201310425292A CN 103457035 B CN103457035 B CN 103457035B
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Abstract
The present invention relates to a kind of double arc-curve face microwave absorbing material, be mainly used in improving polyurethane pyramid absorbing material at frequency range d/ λ (d: material height; λ: electromagnetic wavelength): the microwave absorbing property of 1～3 scope. Described in the two arc-shaped curved surface microwave absorbing materials of the present invention, comprise the bullet on pedestal and pedestal, described bullet is made up of 2 sections of different arc-shaped curved surfaces, and epimere is concave curvatures, and hypomere is convex surface. The present invention adopts and changes conventional polyurethanes pyramid contour structures, utilizes double arc-curve surface function to optimize absorbing material cross section equivalence resistance per square value, reduces inner electric wave Kelvin effect, improves absorbing material normal incidence reflectivity, reduces material height.
Description
Technical field
The present invention relates to a kind of double arc-curve face microwave absorbing material, be mainly used in improving polyurethane pyramid absorbing material at frequency range d/ λ(d: material height; λ: electromagnetic wavelength): the microwave absorbing property of 1～3 scope.
Background technology
Polyurethane pyramid absorbing material is to use the raw materials such as conductive carbon black, fire retardant, by polyurethane foam plastics in impregnatorRepeatedly extruding, controls foamed plastics liquid absorption, and high temperature drying, cuts into the positive four pyramidal microwave absorbing materials in limit. Outside itShape structure makes the space electromagnetic wave of vertical incidence in pyramid absorbing material cone tip part generation electric wave impedance matching effect, makes electromagnetismRipple is injected polyurethane pyramid absorbing material inside to greatest extent, absorbs at inner multiple attenuation. According to electromagnetic transmission lineationOpinion, electromagnetic wave vertical incidence its wave impedance in the time of absorbing material in space is 377 Ω, and the electric wave vertical incidence of absorbing material insideWhile shielding steel plate to darkroom, its wave impedance is 2 Ω. When wave impedance reduces to 2 Ω by 377, this transition process be subject to two aspects because ofElement impact, the one, the phosphorus content of material causes representative section resistance per square value to change; The 2nd, the contour structures variation of material causes equivalenceThe variation of cross section resistance per square value. Conventional polyurethanes pyramid absorbing material is made up of the cone on square pedestal and pedestal, coneProfile is positive pyramid, if when material unit are phosphorus content is constant, electric wave is bored sharp direction vertical incidence to inner by pyramid,Be equilateral triangle along electric wave direction material section, electromagnetic wave wave impedance is reduced to 2 Ω according to linear relationship. But this equivalenceCross section resistance per square value linear attenuation, easily causes electromagnetic wave to exist reflection of electromagnetic wave phenomenon along the vertical cross-section place of the direction of propagation,Cause electromagnetic wave Kelvin effect. Because electromagnetic wave cannot penetrate the region below skin depth, causing material vertical to reflect cannot beLargeization. Absorbing material below the degree of depth cannot electromagnetic wave absorption, has caused the efficiency ratio of absorbing material, and waste is serious. ThereforeThis technology adopts diagonal cone absorbing material profile to adopt Nonlinear Processing, makes to reduce above-mentioned undesirable element, raising absorbing materialTo electromagnetic wave absorption maximum, ensure that vertical incidence performance is constant, maximum using absorbing material, reduces material height, thereby fallsLow production cost, meets the demand in antenna measurement darkroom.
Summary of the invention
In order to improve existing polyurethane pyramid absorbing material at frequency range d/ λ (d: material height; λ: electromagnetic wavelength): 1～3 modelThe microwave absorbing property of enclosing. The invention provides a kind of manufacture method of double arc-curve face microwave absorbing material.
Of the present invention pair of arc-shaped curved surface microwave absorbing material contour structures as shown in Figure 1, 2. Polyurethane list cone comprises pedestal and baseBullet on seat, described bullet is made up of 2 sections of different arc-shaped curved surfaces, and epimere is concave curvatures, and hypomere is convex surface.Be made up of 2 sections of arc curves respectively, near the sharp concave curvatures of cone, cross section equiva lent impedance slowly reduces, and reduces the electric wave skin effect that becomesShould improve vertical incidence radio wave transmission; The convex surface at the cone end, cross section equivalent area increases sharply, and resistance per square is reduced to rapidly2 Ω, decay absorbs in inside to improve electric wave.
The concave curvatures radius R 1 of described double arc-curve face pyramid absorbing material is between 3000～9000mm.
The convex surface radius R 2 of described double arc-curve face pyramid absorbing material is between 600～3000mm.
Two circular arc joining height of described double arc-curve face pyramid absorbing material are that d1 is 100～1000mm.
The height d of described double arc-curve face pyramid absorbing material is between 400～2000mm.
The bottom side length L of described double arc-curve face pyramid absorbing material is between 100～600mm.
The present invention adopts and changes conventional polyurethanes pyramid contour structures, utilizes double arc-curve surface function to optimize the efficacious prescriptions electricity such as absorbing material cross sectionResistance, reduces inner electric wave Kelvin effect, improves absorbing material normal incidence reflectivity, reduces material height.
Brief description of the drawings
The two arc-shaped curved surface microwave absorbing material bullet structure charts of Fig. 1.
The two arc-shaped curved surface microwave absorbing material stereograms of Fig. 2.
Fig. 3 embodiment 1400mm double arc-curve face microwave absorbing material is at 1GHz～6GHz vertical reflection rate figure.
Fig. 4 comparative example 1400mm gold tower pyramid absorbing material is at 1GHz～6GHz vertical reflection rate figure.
Fig. 5 comparative example 2700mm gold tower pyramid absorbing material is at 1GHz～6GHz vertical reflection rate figure.
Detailed description of the invention
Embodiment 1
The cone point of setting double arc-curve face pyramid is 21.2 ° of material height d=400mm, calculates pyramid base L=150mm, usesSOLIDWORK software carries out the modeling of hyperboloid radian according to Fig. 1 to bullet structure, sets up bullet double arc-curve face parameterR1, R2, d1(R1: concave Iy curved radius, R2: convex subsequent corrosion, d1: concave-convex curved surface points of tangency is vertical to pedestalDistance) model data is directed into FDTD Electromagnetic Simulation design software, input polyurethane is inhaled ripple foamed plastics 1～6GHz'sElectromagnetic parameter, and calculate vertical reflection rate. By adjusting structural parameters, increase or reduce R1, R2, d1 gain of parameter differenceMaterial reflectance emulated data, therefrom selects optimum reflectivity, determines double arc-curve face parameters R 1, R2, the d1 of bullet the best.According to simulation parameter, use computer analog cutting equipment to inhale ripple foamed plastics to polyurethane and cut, produce 400mm double arc-curveFace microwave absorbing material. Its R1 is 3000mm, and R2 is 600mm, and d1 is 120mm, bores high 350mm, bores wide 150mm,Bottom (pedestal) height 45mm, bottom side length 600mm, pyramid number 16.
Comparative example 1
The high polyurethane pyramid absorbing material of 400mm that Nanjing Nanda Boping Electronics Information Co., Ltd. produces, contour structures is pyramidType, bores high 350mm, bores wide 150mm, bottom (pedestal) height 50mm, bottom side length 600mm, pyramid number 16.
Comparative example 2
The high polyurethane pyramid absorbing material of 700mm that Nanjing Nanda Boping Electronics Information Co., Ltd. produces, contour structures is pyramidType, bores high 570mm, bores wide 200mm, bottom (pedestal) height 125mm, bottom side length 600mm, pyramid number 9.
Physical property
Electro-magnetic wave absorption performance
Adopt the method for testing of arch darkroom high frequency to carry out vertical direction electricity to embodiment 1, comparative example 1, comparative example 2 microwave absorbing materialsThe performance test of wave reflection rate is tested, test frequency scope 1GHz～6GHz, and reflectance curve is listed in Fig. 3-5. TestData show that the two arc-shaped curved surface pyramid materials of 400mm improve than 400mm gold tower pyramid absorbing material in the time of 1～2GHz4～5Db, performance is suitable to electric wave absorbent properties with 700mm pyramid pyramid absorbing material.
Claims (4)
1. two arc-shaped curved surface microwave absorbing materials, comprise the bullet on pedestal and pedestal, it is characterized in that: described bullet is by 2The arc-shaped curved surface composition of Duan Butong, epimere is concave curvatures, hypomere is convex surface.
2. according to claim 1 pair of arc-shaped curved surface microwave absorbing material, is characterized in that concave curvatures radius R 1 is3000～9000mm。
3. according to claim 1 pair of arc-shaped curved surface microwave absorbing material, is characterized in that convex surface radius R 2 is600～3000mm。
4. according to claim 1 pair of arc-shaped curved surface microwave absorbing material, is characterized in that two arc joining height d1 are100～1000mm。
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2682254C1 (en) * | 2017-12-28 | 2019-03-18 | Сергей Валерьевич Елизаров | Radio absorbing element manufacturing method |
| CN108901194A (en) * | 2018-08-14 | 2018-11-27 | 桂林电子科技大学 | A kind of Novel ultra wide band wave absorbing device |
| DE102019217945A1 (en) * | 2019-11-21 | 2021-05-27 | Robert Bosch Gesellschaft mit beschränkter Haftung | Absorber structure for automotive radar |
| CN111929331B (en) * | 2020-07-10 | 2024-05-28 | 重庆测威科技有限公司 | Curved surface wave-absorbing material reflectivity field test method |
| CN113203484B (en) * | 2021-05-06 | 2022-05-03 | 北京化工大学 | Calibration source unit structure of coating square cone type microwave radiometer |
| CN116859135B (en) * | 2023-08-31 | 2023-10-31 | 辽宁信鼎检测认证有限公司 | Communication contrast test system suitable for wireless product |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1436041A (en) * | 2002-01-31 | 2003-08-13 | 株式会社理研 | Radio wave absorber |
| CN103108532A (en) * | 2011-11-11 | 2013-05-15 | Nec东金株式会社 | Radio wave absorber unit |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1436041A (en) * | 2002-01-31 | 2003-08-13 | 株式会社理研 | Radio wave absorber |
| CN103108532A (en) * | 2011-11-11 | 2013-05-15 | Nec东金株式会社 | Radio wave absorber unit |
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Effective date of registration: 20141203 Address after: 210000 Jiangsu city of Nanjing province high tech Industrial Development Zone Huidalu No. 6 Beidou 2 storey building Applicant after: NANJING BOPING ELECTRONIC TECHNOLOGY CO., LTD. Address before: Jiangning Development Zone in Nanjing City, Jiangsu province 211113 Lukou Airport Industrial Park Lantian Road No. 19 Applicant before: Nanjing Nanda Boping Electronics Information Co., Ltd. |
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Address after: 210031 2 / F, Beidou building, No. 6, Huida Road, Jiangbei new district, Nanjing City, Jiangsu Province Patentee after: Nanjing aerospace Boping Electronic Technology Co., Ltd Address before: 210000 Jiangsu city of Nanjing province high tech Industrial Development Zone Huidalu No. 6 Beidou 2 storey building Patentee before: NANJING BOPING ELECTRONIC TECHNOLOGY Co.,Ltd. |
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