CN104852153B

CN104852153B - It is a kind of that RCS composites are reduced based on the broadband for intersecting bowtie-shaped AMC

Info

Publication number: CN104852153B
Application number: CN201510178058.XA
Authority: CN
Inventors: 马剑南; 洪韬; 陈益龙
Original assignee: Beihang University
Current assignee: Beihang University
Priority date: 2015-04-15
Filing date: 2015-04-15
Publication date: 2017-10-10
Anticipated expiration: 2035-04-15
Also published as: CN104852153A

Abstract

Present applicant proposes a kind of based on the broadband reduction RCS composites for intersecting bowtie-shaped AMC, it is characterized in that, the composite is three-decker, AMC patch arrays, dielectric substrate and metal floor are followed successively by from top to bottom, wherein described AMC patch arrays are two kinds and intersect the array that bowtie-shaped AMC pasters are separately constituted, and the shape of described two intersection bowtie-shaped AMC pasters is：Center be square, four square sides connect respectively four it is trapezoidal, connection square be trapezoidal short base, four trapezoidal long bases are sequentially connected rectangle, and each paster is a complete integrative-structure.The composite broadband performance is excellent, and the RCS for having more than 10dB with respect to same size metallic plate in 16.2 27.2GHz frequency range reduces, and covers whole K-band；Thickness is small, easily conformal, is adapted to manufacture ultralight, ultra-thin wave-absorber or radar absorbing；Structure, materials are simple, and processing and manufacturing difficulty is small.

Description

It is a kind of that RCS composites are reduced based on the broadband for intersecting bowtie-shaped AMC

Technical field

The application is related to stealth technology field, more particularly, to a kind of composite.

Background technology

Stealth technology, be on modern military it is hidden oneself in order to avoid enemy has found, assault ability or protect itself so as to enhancing Important means.The Stealth Fighter of weapon or flying body, depends mainly on their radar scattering section (Radar Cross Section, referred to as RCS) size.The RCS values for reducing target more difficult could be found by enemy.Common reduction RCS Method be configuration design and radar absorbing.Configuration design is, by reasonable design objective profile, to reflect off energy Arrival bearing, that is, by it is preceding to big echo move on to laterally.But configuration design is limited by structure and size etc., there is certain Bottleneck.Radar absorbing (Radar Absorbing Material, referred to as RAM) typically has two kinds, and one kind is to absorb Type, one kind is interference-type.Absorption-type material is that the energy dissipation that electromagnetic energy is converted into heat energy or other forms is fallen, but it is deposited Poor in aerodynamic performance, thickness is big, the shortcomings of easy to fall off.Interference-type material is the interference cancellation principle based on back wave, Under specific thicknesses, interfere and weaken because of anti-phase between back wave twice.Present context is exactly a kind of interference-type radar Absorbing material.

With the development of stealth technology, low RCS stealth materials are of increased attention.

Meta Materials are the new academic vocabulary that 21 century physics field occurs, and are that one kind has natural material institute not The artificial composite structure or composite of the extraordinary physical property possessed." Meta Materials " developed so far include：LHM, Photonic crystal, super magnetic material etc..Wherein, photonic crystal is invented in light-wave band, and microwave band is introduced afterwards, is gone out Electromagnetic bandgap structure (Electromagnetic Band-Gap, referred to as EBG) is showed, this material can make a certain frequency model Electromagnetic wave in enclosing can not be propagated in this periodic structure.The appearance of electromagnetic bandgap structure is to develop thinner and lighter, frequency band more Wide stealth material provides new technological means.

Artificial magnetic conductor (Artificial Magnetic Conductors, referred to as AMC) is a kind of typical electromagnetism Bandgap structure, has the effect that same-phase reflects, also to the plane electromagnetic wave under the incident a certain frequency in its surface It is to say in its surface, the phase of back wave is equal to incidence wave, because this zero reflected phase characteristics are similar to perfect magnetic conductor, So being named as artificial magnetic conductor.In recent years, people have done substantial amounts of grind to applications of the AMC in terms of target RCS is reduced Study carefully.Plane chessboard knot based on AMC and perfect electric conductor (Perfect Electrical Conductors, referred to as PEC) Structure, can realize that RCS reduces in arrowband, compared to traditional Salisbury radiation shields, eliminate quarter-wave thickness Interval, with low section, easily conformal advantage.

However, the working band of this absorbing material is narrower, it is impossible to support the defect of broadband operation to greatly reduce it Practical value.

The content of the invention

In order to obtain broader suction wave frequency band, present applicant proposes a kind of based on the composite wood for intersecting bowtie-shaped AMC units Material, is constituted using two kinds of AMC arrays, and this design overcomes AMC as the arrowband feature of resonance structure, utilizes effective phase difference Concept substantially increases bandwidth of operation.

Present applicant proposes a kind of based on the broadband reduction RCS composites for intersecting bowtie-shaped AMC, it is characterised in that should Material is three-decker, and AMC patch arrays, dielectric substrate and metal floor are followed successively by from top to bottom, wherein AMC pasters battle array It is classified as two kinds and intersects the array that separately constitutes of bowtie-shaped AMC pasters, described two intersection bowtie-shaped AMC pasters is shaped as：In Centre is square, four square sides connect respectively four it is trapezoidal, connection square is trapezoidal short base, and four are trapezoidal Long base is sequentially connected rectangle, and each paster is a complete integrative-structure.

Further, wherein the first intersects bowtie-shaped AMC paster AMC1, intermediate square length of side 0.22mm, trapezoidal short bottom Side 0.22mm, long base 1.06mm, trapezoidal high 0.76mm, cycle 4mm；Second of intersection bowtie-shaped AMC paster AMC2, centre Square length of side 0.12mm, trapezoidal short base 0.12mm, long base 0.57mm, trapezoidal high 0.405mm, cycle 4mm.

Further, the AMC patch arrays are checkerboard pattern, and from multiple chessboard units to the unlimited continuation of four direction Formed, the chessboard unit is made up of AMC1 blocks and AMC2 blocks with 2 × 2 number cross arrangement, and the AMC1 blocks are mono- by AMC1 Member is constituted with 6 × 6 number, and the AMC2 blocks are made up of AMC2 units with 6 × 6 number.

Further, the material of the paster is metal.

Further, the dielectric substrate uses the dielectric materials of ROGERS 3010, and dielectric material thickness is 1.05mm.

The intersection bowtie-shaped AMC composites that the application is proposed, (1) its broadband performance is excellent, in 16.2-27.2GHz Frequency range in have more than -10dB RCS reductions with respect to same size metallic plate, cover whole K-band；(2) thickness is small, easily altogether Shape, is adapted to ultralight, the ultra-thin absorbing material of manufacture；(3) structure, materials are simple, and processing and manufacturing difficulty is small.

Brief description of the drawings

Fig. 1 the first intersect the shape of bowtie-shaped AMC1 pasters and reduce in broadband and used in target RCS composites Size；

The shape of second of Fig. 2 intersection bowtie-shaped AMC2 pasters and reduce what is used in target RCS composites in broadband Size；

The broadband that Fig. 3 the application is proposed reduces the top view of target RCS composites；

The broadband that Fig. 4 the application is proposed reduces the side view of target RCS composites；

The normalization mono- static RCS curve of Fig. 5 composites.

Embodiment

Below in conjunction with accompanying drawing, the present invention is described in further detail.

Because Bow―tie antenna has good broadband character relative to other paster antennas, characteristic impedance can be wider Kept in frequency range, so intersecting bowtie-shaped paster as AMC units has broadband character, while two kinds have the anti-of opposite phase Ejected wave can interfere the phenomenon of cancellation, so that backward energy reduction, phase difference is closer to 180 °, and backward energy is got over It is low.According to the theory of array antenna, the phase difference frequency band of two kinds of AMC arrays and the RCS reduction frequency bands of this composite have pair The relation answered, using same size metallic plate as comparison other, if selection -10dB is reduction target, the reflection phase of two kinds of AMC arrays Potential difference scope is 180 ° ± 37 °.For the sake of simplicity, generally taking 180 ° ± 30 °, corresponding frequency is referred to as effective phase difference frequency range.

Fig. 1 and Fig. 2 respectively illustrate the shape for intersecting bowtie-shaped AMC1 and AMC2 paster.Intersect the center of bowtie-shaped paster Be square, four square sides connect respectively four it is trapezoidal, connection square be trapezoidal short base, four trapezoidal length Base is sequentially connected rectangle, and paster is a complete integrative-structure, and the description of above-mentioned separation is simply to illustrate that this paster Shape.In use, two kinds of AMC are combined into checkerboard configuration.Intersection bowtie-shaped AMC1 is also respectively illustrated in Fig. 1 and Fig. 2 The size reduced with AMC2 pasters in the broadband of design used in RCS composites, particularly as the intermediate square for being AMC1 The length of side 0.22mm, trapezoidal short base 0.22mm, long base 1.06mm, trapezoidal high 0.76mm, the cycle is 4mm；AMC2 centre Square length of side 0.12mm, trapezoidal short base 0.12mm, long base 0.57mm, trapezoidal high 0.405mm, the cycle is 4mm.Multiple The material of this paster is metal in condensation material.

The broadband that the application proposition is given in Fig. 3 reduces the top view of RCS composites.Wherein, it can be seen by scheming (a) Go out, AMC patch arrays 1 are checkerboard pattern, and are formed from multiple chessboard units 2 to the unlimited continuation of four direction；Can by scheming (b) To find out, each chessboard unit 2 is made up of AMC1 blocks 3 and AMC2 blocks 4 with 2 × 2 number cross arrangement, and every kind of AMC units are with 6 × 6 number composition AMC blocks (such as 6 × 6 AMC1 units composition AMC1 blocks 3).It is pointed out that this absorbing material exists Design phase is infinitely great periodic structure, according to cost as far as possible many chessboard units can be selected to make material object during making, worked Performance will not have obvious reduction than unlimited big structure.

Fig. 4 is the side view that the broadband that the application is proposed reduces RCS composites.Composite is three-decker, from upper AMC patch arrays, dielectric substrate and metal floor are followed successively by under.In an embodiment, orlop is metal floor, Intermediate layer is the dielectric substrates of ROGERS 3010, and dielectric substrate thickness is 1.05mm, and the superiors are AMC patch arrays.

Fig. 5 is that broadband reduces the mono- static RCS simulation curve of RCS composites, and has carried out normalizing with the metallic plate of size Change is handled.Emulation tool is ANSYS HFSS, and simulation result shows：The basic of composite is used as using bowtie-shaped paster is intersected Unit, -10dB mono- static RCSs reduction frequency band is 16.2-27.2GH, and bandwidth reaches 50.7%, maximum reduction amplitude -36dB, broadband It is functional, there is good practical value.

Claims

1. a kind of reduce RCS composites based on the broadband for intersecting bowtie-shaped AMC, it is characterised in that the composite is three Rotating fields, are followed successively by AMC patch arrays, dielectric substrate and metal floor from top to bottom, wherein the AMC patch arrays are two kinds Intersect the array that bowtie-shaped AMC paster AMC1 units and AMC2 units are separately constituted, described two intersection bowtie-shaped AMC pasters The shape of AMC1 units and AMC2 units is：Center is square, and four square sides connect four trapezoidal, connections respectively Square is trapezoidal short base, and four trapezoidal long bases are sequentially connected rectangle, and each paster is a complete one knot Structure；The AMC patch arrays are checkerboard pattern, and are formed, the chess from multiple chessboard units to the unlimited continuation of four direction Disk unit is made up of AMC1 blocks and AMC2 blocks with 2 × 2 number cross arrangement, and AMC1 blocks are by AMC1 units with 6 × 6 number group Into AMC2 blocks are made up of AMC2 units with 6 × 6 number.

2. according to claim 1 reduce RCS composites based on the broadband for intersecting bowtie-shaped AMC, wherein the first is handed over Bowtie-shaped AMC paster AMC1, its intermediate square length of side 0.22mm, trapezoidal short base 0.22mm, long base 1.06mm are pitched, it is trapezoidal High 0.76mm, the cycle is 4mm；Second of intersection bowtie-shaped AMC paster AMC2, its intermediate square length of side 0.12mm, it is trapezoidal Short base 0.12mm, long base 0.57mm, trapezoidal high 0.405mm, the cycle is 4mm.

3. according to claim 1 reduce RCS composites, the material of the paster based on the broadband for intersecting bowtie-shaped AMC Material is metal.

4. according to claim 1 reduce RCS composites, the dielectric substrate based on the broadband for intersecting bowtie-shaped AMC Using the dielectric materials of ROGERS 3010, and dielectric material thickness is 1.05mm.