CN103427166B - Broadband microwave absorber based on folded dipole - Google Patents
Broadband microwave absorber based on folded dipole Download PDFInfo
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- CN103427166B CN103427166B CN201310374702.1A CN201310374702A CN103427166B CN 103427166 B CN103427166 B CN 103427166B CN 201310374702 A CN201310374702 A CN 201310374702A CN 103427166 B CN103427166 B CN 103427166B
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Abstract
The invention relates to a microwave absorber with broadband absorption characteristics, in particular to a broadband microwave absorber based on a folded dipole. According to the broadband microwave absorber, a folded dipole antenna serves as a design starting point, an antenna array with a broadband is designed based on a smith chart impedance adjustment method, furthermore, a feed source is replaced by a load resistor based on the reciprocity principle of the antenna, and therefore the microwave absorber with the broadband absorption characteristics is obtained. A dielectric layer of the absorber is of a double-layer structure, the upper layer is a common dielectric substrate, and the lower layer is common polystyrene foam materials (the dielectric constant is approximately 1.07). Although double-layer dielectric materials are adopted, a single-layer metal SMD circuit is adopted to be used in cooperation with a thin film SMD resistor. The broadband microwave absorber based on the folded dipole is simpler in structure, easier to process, low in cost and light in weight, and therefore mass production can be achieved.
Description
Technical field
The present invention relates to a kind of electro-magnetic wave absorption circuit, particularly a kind of wide-band microwave absorber based on folded dipole for EMC Design and radar absorbing material.
Background technology
The safety research of electronic equipment in electromagnetic environment comes from the research of the electromagnetic information anti-leak of military equipment the earliest, is called TEMPEST technology (electromagnetic information leakage guard technology).Along with civil electronic information products extensive use and update fast, the electromagnetic environment fail safe of electronic equipment also receives publicity, not just self the information leakage problem mainly considered unlike civil electronic information products with TEMPEST technology, but whether the normal work that whether can affect equipment of itself of the electromagnetic field of outside and the electromagnetism that self distributes can affect the normal work of other electronics and IT products.In addition, along with the modern times scout and the improving constantly of Detection Techniques level, higher requirement be it is also proposed to the performance of radar absorbing.
The use of electromagnetic wave absorb realizes shielding electromagnetic wave not disturb miscellaneous equipment and not by a kind of effective means that miscellaneous equipment disturbs.Different according to its mechanism of action, the research of absorber is mainly divided into two large classes: a kind of is research to new material, such as absorbent, the design of the composite materials such as absorbing material and the utilization of Meta Materials; Another is exactly the design based on Circuit theory, such as wire netting, and Salisbury shields, Jaumann absorber and not only comprise the Circuit analogous absorber that resistance components also comprises reactive component.At present, the research to resistive material being focused on to the research of Circuit analogous absorber, by designing the resistive film of difformity and different resistance value, realizing the absorption to incident electromagnetic wave.For this type of absorber, obtain more satisfactory absorbent properties if want in wider bandwidth, then the Main Means taked is the number of plies increasing absorbed layer, and this not only can increase the cost of making, and the volume and weight of absorber also can be made to increase.
As from the foregoing, the implementation method more complicated of prior art, and the microwave-absorbing body being difficult to that realization not only had the wide characteristic of work strip but also had low section characteristic.
Summary of the invention
Technical problem solved by the invention is to provide a kind of wide-band microwave absorber based on folded dipole, and it can absorb incident electromagnetic wave in wide-band.
The technical solution realizing the object of the invention is: a kind of wide-band microwave absorber based on folded dipole, group battle array is carried out using folded dipole structure as basic structure, with four centrosymmetric half folded dipole structure for one-period unit carries out two dimension arrangement, the angle of adjacent two folded dipole structure is 90 degree, the all imperfect folded dipole structure being arranged in boundary periodic unit supplements with half folded dipole structure with its symmetry respectively, above structure is printed on medium substrate, below medium substrate, metallic plate is set, between medium substrate and metallic plate, filled polystyrene cystosepiment is in order to Supporting Media substrate, each folded dipole structure comprises the equal non-feed source metal arm of the length of interconnection and has feed metal arm, the two is parallel to each other and its junction is antenna end, the centre position of antenna end arranges Chip-R, the non-feed source metal arm of interconnection and have the both sides of feed metal arm that four nodel lines are set, wherein two nodel lines are positioned at and are connected with antenna end outside non-feed source metal arm and parallel with non-feed source metal arm, two other is propped up nodel line and is positioned to have and is connected with antenna end outside feed metal arm and parallels with there being feed metal arm, there is the middle part of feed metal arm that load resistance is set, the distance of antenna end and load resistance is less than quarter-wave.
Compared with prior art, its remarkable advantage is in the present invention: the 1) microwave-absorbing body based on folded dipole structure of the present invention's proposition, can realize the absorption to dual polarization incident electromagnetic wave; Its relative bandwidth of operation is more than 100%, and when the angle of incident wave is 45 °, Absorber Bandwidth still remains on more than 90%; 2) microwave-absorbing body based on folded dipole structure of the present invention's proposition, although have employed double-deck dielectric material, but only have employed the metal patch circuit of individual layer, coordinate the use of film patch resistance, structure is simpler, processing is easier, and cost and weight are all relatively little, thus can large-scale production; In addition, also can with other technologies, such as mems switch technology designed in conjunctionly goes out to have reception, launches and the radar system parts of the functions such as absorption.
Below in conjunction with accompanying drawing, the present invention is described in further detail.
Accompanying drawing explanation
Fig. 1 is the structural representation of folded dipole of the present invention.
Fig. 2 is the schematic three dimensional views of periodic unit.
Fig. 3 is the wide-band microwave absorbent structure vertical view based on folded dipole.
Embodiment
Composition graphs 1, Fig. 2 and Fig. 3, a kind of wide-band microwave absorber based on folded dipole of the present invention, group battle array is carried out using folded dipole structure as basic structure, with four centrosymmetric half folded dipole structure for one-period unit carries out two dimension arrangement, the angle of adjacent two folded dipole structure is 90 degree, the all imperfect folded dipole structure being arranged in boundary periodic unit supplements with half folded dipole structure with its symmetry respectively, above structure is printed on medium substrate 7, metallic plate 9 is set below medium substrate 7, between medium substrate 7 and metallic plate 9, filled polystyrene cystosepiment 8 is in order to Supporting Media substrate 7, each folded dipole structure comprises the equal non-feed source metal arm of the length of interconnection 1 and has feed metal arm 2, the two is parallel to each other and its junction is antenna end 3, the centre position of antenna end 3 arranges Chip-R 6, the non-feed source metal arm 1 of interconnection and have the both sides of feed metal arm 2 that four nodel lines 4 are set, wherein two nodel lines 4 are positioned at and are connected with antenna end 3 outside non-feed source metal arm 1 and parallel with non-feed source metal arm 1, two other is propped up nodel line 4 and is positioned to have and is connected with antenna end 3 outside feed metal arm 2 and parallels with there being feed metal arm 2, there is the middle part of feed metal arm 2 that load resistance 5 is set, antenna end 3 is less than quarter-wave with the distance of load resistance 5.
The dielectric constant of described medium substrate 7 is 2.2 ~ 10.2, and thickness is 1mm.
Described packing material 8 is polystyrene foam plate, and its effective dielectric constant is 1.03 ~ 1.07, and thickness is
wherein λ
0for the wavelength in free space.
The width of the non-feed source metal arm 1 of described folded dipole is have feed metal arm 2 width 1/4th, and the spacing of two-arm is 3 times that have feed metal arm 2 width; Antenna end 3 is 1/3 of non-feed source metal arm 1 length with the distance of load resistance 5, and the width of antenna end 3 is 0.5mm; The width propping up nodel line 4 is equal with the width of non-feed source metal arm 1, and the length of a nodel line 4 equals 1/5 of non-feed source metal arm 1 length.
The resistance of described load resistance 5 is equal as input impedance value during antenna with folded dipole.
The resistance of described Chip-R 6 is the twice of common half-wave dipole radiation impedance value.
Refinement explanation is carried out to the details of concrete device of the present invention and working condition below.
The width of the non-feed source metal arm 1 of complete folded dipole is 0.3mm, and length is 16.2mm; Have the width of feed metal arm 2 to be 1.2mm, length is 16.2mm; Article four, the width propping up nodel line 4 is 0.3mm, and length is 3.5mm, is 0.3mm with the distance of non-feed source metal arm 1; Non-feed source metal arm 1 and have the spacing of feed metal arm 2 to be 3.95mm, the width of folded doublet end 3 is 0.5mm; Have feed metal arm 2 medium position to load SMD load resistance 5, its encapsulation model is 0603, and resistance is 620 Ω; For eliminating the paster FSS mode of operation that adjacent two folded dipoles being positioned at different directions of dual-polarized array produce, load Chip-R 6 at folded doublet end 3, its encapsulation model is 0402, and resistance is 150 Ω.For meeting the absorption to the polarized wave of orthogonal both direction, periodic unit is of a size of 22.5mm*22.5mm, be made up of identical half folded dipole of four sizes being positioned at vertical direction, other half folded dipole of every half folded dipole and equidirectional adjacent cells forms a complete folded dipole; The like, two vertical direction of plane are carried out two-dimension periodic arrangement 13*13 unit.In addition, for ensureing integrally-built integrality, 1st row of sample, 3rd row, 1st row and the 13rd arranges in unit, be positioned at 13*13 only half folded dipole in outside, form complete folded dipole separately with the left collocation structure 10 of its symmetry, right collocation structure 11, lower collocation structure 12 and upper collocation structure 13.It is on the epoxy resin medium substrate 7 of 4.4 that folded dipole subarray is printed on dielectric constant, and its thickness is 1mm; Penetrating absorber for stoping incident wave enters in protected circuit or system, and below folded dipole subarray, metallic plate 9 is placed at 11mm place, and for ensureing the intensity of absorber entirety, the thickness of metallic plate 9 is 2mm; Filled polystyrene foamed material between medium substrate 7 and metallic plate 9, its effective dielectric constant is 1.07, and thickness is 10mm.
This example comprises 14*13 laterally folded dipole, 13*14 longitudinal folding dipole, and overall cross sectional dimensions is 315mm*315mm, and gross thickness is the thickness of 13mm(wherein ground plate is 2mm), total weight is 747 grams.Through numerical computations and actual test, when in electromagnetic wave vertical incidence to sample, absorptivity be 90% band limits be 2.85GHz ~ 8.45GHz, relative bandwidth is 99.1%; When incident angle is 45 °, the band limits of TE ripple absorptivity more than 80% is the band limits of 2.8GHz ~ 7.6GHz, TM ripple absorptivity more than 80% is 3.5GHz ~ 7.5GHz.
Below the preparation process of the wide-band microwave absorber that the present invention is based on folded dipole is described in detail: (1) first, determines the centre frequency of microwave-absorbing body and the parameter of upper layer medium substrate, mainly dielectric constant and thickness.Based on the surface smoothness of absorber and the consideration of total weight, thickness is selected usually between 0.5mm ~ 1mm.
(2) by the relation between the dielectric constant of common dipole sub antenna resonance frequency and medium substrate and thickness, the equivalent free space wavelength of folded dipole is determined.According to the main mould of periodic structure to the width of the requirement determining unit of cell size, be generally the half of equivalent free space wavelength; And the working mechanism of absorber is simulated according to traditional circuit, determine the thickness of lower floor's polystyrene foam, be about 1/4th of equivalent free space wavelength; And metallic plate is placed below froth bed.
(3) theoretical according to folded doublet, determine two-arm width and the length of common folded dipole, now the width of two-arm is equal; By changing spacing, the width ratio of two-arm, change the CURRENT DISTRIBUTION in two-arm and input impedance value, the bandwidth of operation of broadening antenna.
(4) antenna end in step (3) is namely moved towards feed direction, thus change the reactance characteristic of folded dipole characteristic impedance, further Bandwidth.
(5) smaller according to end current during dipole subclass Antenna Operation physical phenomenon, a nodel line is compensated by being folded to form to the part beyond the antenna end of feed direction translation to dipole both sides in step (3), the size of antenna and unit can be reduced, be conducive to the sensitiveness reducing incident wave angle.
(6) according to antenna reciprocity principle, each feed load resistance of folded dipole array antenna in (step 5) is replaced, its resistance equals the feed characteristic impedance value in step (5), thus realizes the single polarization microwave-absorbing body with broadband character.
(7) with the folded dipole subelement obtained in step (6) for elementary cell, it is carried out group battle array in pairwise orthogonal incident wave direction periodic arrangement, realizes the dual polarization characteristic of microwave-absorbing body.And at folded dipole end respectively loading resistor, eliminate adjacent two vertical folded dipoles and can introduce new mode of operation, under this pattern can there is approximate total reflection in absorber.
As from the foregoing, the present invention designs the bandwidth requirement of working frequency range for adapting to electromagnetic wave absorb, and consider the incident wave of different polarised direction and different angles, improve for the Miniaturization Design of unit and suitable group battle array scheme and optimize in the design; In addition, the use of polystyrene foamed material not only can cut down finished cost, and can also greatly reduce overall weight.Be 100% based on the wide-band microwave absorber of folded dipole to the relative bandwidth of the absorptivity of the incident wave of horizontal and vertical polarised direction more than 90%, be the relative bandwidth of absorptivity more than 90% of 45 ° of incident waves to incident angle be more than 90%, and thickness is less than 1/4th of centre frequency place wavelength in free space.
Claims (6)
1. the wide-band microwave absorber based on folded dipole, it is characterized in that, group battle array is carried out using folded dipole structure as basic structure, four half folded dipoles are formed centrosymmetric structure, and with this centrosymmetric structure for one-period unit is arranged, the angle of adjacent two folded dipole structure is 90 degree, the all imperfect folded dipole structure being arranged in boundary periodic unit supplements with half folded dipole structure with its symmetry respectively, above structure is printed on medium substrate [7], medium substrate [7] below arranges metallic plate [9], between medium substrate [7] and metallic plate [9], filled polystyrene cystosepiment [8] is in order to Supporting Media substrate [7], each folded dipole structure comprises the equal non-feed source metal arm [1] of the length of interconnection and has feed metal arm [2], the two is parallel to each other and its junction is antenna end [3], the centre position of antenna end [3] arranges Chip-R [6], interconnection non-feed source metal arm [1] and have the both sides of feed metal arm [2] arrange four prop up nodel lines [4], wherein two nodel lines [4] are positioned at non-feed source metal arm [1] outside and are connected with antenna end [3] and parallel with non-feed source metal arm [1], two other is propped up nodel line [4] and is positioned at and has feed metal arm [2] outside to be connected with antenna end [3] and to parallel with there being feed metal arm [2], there is the middle part of feed metal arm [2] that load resistance [5] is set, antenna end [3] is less than quarter-wave with the distance of load resistance [5].
2. the wide-band microwave absorber based on folded dipole according to claim 1, is characterized in that, the dielectric constant of medium substrate [7] is 2.2 ~ 10.2, and thickness is 1mm.
3. the wide-band microwave absorber based on folded dipole according to claim 1 and 2, is characterized in that, packing material [8] is polystyrene foam plate, and its effective dielectric constant is 1.03 ~ 1.07, and thickness is
wherein λ
0for the wavelength in free space.
4. the wide-band microwave absorber based on folded dipole according to claim 1, it is characterized in that, the width of the non-feed source metal arm [1] of folded dipole is for there being 1/4th of feed metal arm [2] width, and the spacing of two-arm is for there being 3 times of feed metal arm [2] width; Antenna end [3] is 1/3 of non-feed source metal arm [1] length with the distance of load resistance [5], and the width of antenna end [3] is 0.5mm; The width propping up nodel line [4] is equal with the width of non-feed source metal arm [1], and the length of a nodel line [4] equals 1/5 of non-feed source metal arm [1] length.
5. the wide-band microwave absorber based on folded dipole according to claim 1, is characterized in that, the resistance of load resistance [5] is equal as input impedance value during antenna with folded dipole.
6. the wide-band microwave absorber based on folded dipole according to claim 1, is characterized in that, the resistance of Chip-R [6] is the twice of common half-wave dipole radiation impedance value.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103762429A (en) * | 2014-01-03 | 2014-04-30 | 南京大学 | Soft and light electromagnetic wave absorbing material based on ferromagnetic/medium nano-multilayer film structure |
| CN105305094A (en) * | 2014-06-30 | 2016-02-03 | 南京理工大学 | Broadside folded dipole array-based broadband microwave absorber |
| CN104319472B (en) * | 2014-10-21 | 2017-01-11 | 清华大学 | Active RFID (radio frequency identification) antenna capable of working in free space and on metal surface |
| TWI549365B (en) * | 2014-12-02 | 2016-09-11 | Hongbo Wireless Comm Technology Co Ltd | Antenna array of hybrid radiator elements |
| CN104600436A (en) * | 2015-02-12 | 2015-05-06 | 南京理工大学 | Broadband microwave absorber based on capacitive surface |
| FR3035742B1 (en) * | 2015-04-30 | 2018-03-23 | Airbus Operations | ELECTROMAGNETIC WAVE ABSORPTION DEVICE FOR FIXING ON A WALL |
| CN105071555A (en) * | 2015-09-10 | 2015-11-18 | 浙江大学自贡创新中心 | Microwave energy receiving plate |
| CN105576334A (en) * | 2015-12-29 | 2016-05-11 | 中国工程物理研究院电子工程研究所 | Method for improving matching effect of isolated end of PCB or thin-film circuit board |
| CN111446550B (en) * | 2020-02-27 | 2022-02-01 | Oppo广东移动通信有限公司 | Wave absorbing structure, antenna module and electronic equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1856906A (en) * | 2003-08-04 | 2006-11-01 | 哈里公司 | Phased array antenna absorber and associated methods |
| CN102763275A (en) * | 2010-03-23 | 2012-10-31 | 古河电气工业株式会社 | Antenna and integrated antenna |
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| US8952858B2 (en) * | 2009-06-17 | 2015-02-10 | L. Pierre de Rochemont | Frequency-selective dipole antennas |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1856906A (en) * | 2003-08-04 | 2006-11-01 | 哈里公司 | Phased array antenna absorber and associated methods |
| CN102763275A (en) * | 2010-03-23 | 2012-10-31 | 古河电气工业株式会社 | Antenna and integrated antenna |
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