Composite antiballistic radome walls and methods of making the same
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F41H-005/04
H01Q-001/42
F42B-010/46
출원번호
US-0425887
(2013-10-10)
등록번호
US-10062962
(2018-08-28)
국제출원번호
PCT/EP2013/071193
(2013-10-10)
국제공개번호
WO2014/057051
(2014-04-17)
발명자
/ 주소
Kolak, Lewis
Mirotznik, Mark
출원인 / 주소
DSM IP ASSETS B.V.
대리인 / 주소
Nixon & Vanderhye P.C.
인용정보
피인용 횟수 :
0인용 특허 :
29
초록▼
Composite radome wall structures (10) exhibit both antiballistic and radar transparency properties and include an antiballistic internal solid, void-free core (12) and external antireflective (AR) surface layers (14-1, 14-2) which sandwich the core. The antiballistic core (12) can be a compressed st
Composite radome wall structures (10) exhibit both antiballistic and radar transparency properties and include an antiballistic internal solid, void-free core (12) and external antireflective (AR) surface layers (14-1, 14-2) which sandwich the core. The antiballistic core (12) can be a compressed stack of angularly biased unidirectional polyethylene monolayers formed of tapes and/or fibers. Face sheets (16-1, 16-2) and/or one or more impedance matching layers may optionally be positioned between the antiballistic core (12) and one (or both) of the external AR layers (14-1, 14-2) so as to bond the core to the AR surface layer(s) and/or selectively tune the radome wall structure to the frequency of transmission and reception associated with the radar system.
대표청구항▼
1. A composite radome wall structure comprising an antiballistic solid, void-free internal core and antireflective (AR) external surface layers which sandwich the core, wherein the antireflective external surface layers include a layer of material which comprise subwavelength surface (SWS) structure
1. A composite radome wall structure comprising an antiballistic solid, void-free internal core and antireflective (AR) external surface layers which sandwich the core, wherein the antireflective external surface layers include a layer of material which comprise subwavelength surface (SWS) structures, wherein the SWS structures comprise surface relief gratings with a size smaller than a wavelength of incident radiation. 2. The composite radome wall structure of claim 1, which exhibits an electromagnetic transmission efficiency at a frequency of 2 to 40 GHz of 90% or greater. 3. The composite radome wall structure of claim 2, which exhibits National Institute of Justice (NIJ) Standard Level III antiballistic properties. 4. The composite radome wall structure of claim 1, wherein the antiballistic core comprises a compressed stack of angularly biased unidirectional polyethylene monolayers. 5. The composite radome wall structure of claim 4, wherein the stack of angularly biased unidirectional polyethylene monolayers comprises unidirectional polyethylene tapes or fibers. 6. The composite radome wall structure of claim 5, wherein the polyethylene tapes consist of ultrahigh molecular weight polyethylene (UHMWPE). 7. The composite radome wall structure of claim 1, wherein the layer of material which comprises the SWS structures is comprised of a cross-linked polystyrene film. 8. The composite radome wall structure of claim 7, wherein the cross-linked polystyrene film has a thickness between about 2 to about 10 mm. 9. The composite radome wall structure of claim 8, wherein the surface relief structures of the cross-linked polystyrene film comprise micromachined recessed relief structures. 10. The composite radome wall structure of claim 9, wherein centers of adjacent ones of the recessed relief structures are separated from one another by about 6.0 mm. 11. The composite radome wall structure of claim 1, further comprising at least one face sheet layer comprised of a reinforced resin matrix interposed between the core and a respective one of the AR surface layers. 12. The composite radome wall structure of claim 11, which comprises a reinforced resin matrix layer interposed between the core and each one of the AR surface layers. 13. The composite radome wall structure of claim 12, wherein the resin matrix face layers include a fibrous or particulate reinforcement filler material. 14. The composite radome wall structure of claim 13, wherein the reinforcing material is at least one selected from glass, graphite and carbon. 15. The composite radome wall structure of claim 1, further comprising at least one impedance matching layer comprised of a ceramic or polymeric material. 16. The composite radome wall structure of claim 1, wherein the surface relief gratings of the SWS structures comprise moth-eye surfaces comprised of inwardly inverted recesses. 17. The composite radome wall structure of claim 1, wherein the layer of material which comprises the SWS structures is comprised of a film having a thickness between about 2 to about 10 mm, wherein the film includes the surface relief gratings. 18. The composite radome wall structure of claim 17, wherein the surface relief gratings comprise recessed relief structures comprised of an upper generally cylindrical recess and a lower generally cylindrical aperture concentrically positioned with respect to the recess. 19. The composite radome wall structure of claim 18, wherein each of the average depth and diameter of the upper recess of the recessed relief structures is between about 4.0 to about 6.0 mm. 20. The composite radome wall structure according to claim 19, wherein the average depth and diameter of the lower aperture of the recessed relief structures is between about 2.5 to about 3.0 mm and between about 4.5 to about 5.0 mm, respectively. 21. The composite radome wall structure according to claim 19, wherein each of the average depth and diameter of the upper recess of the recessed relief structures is between about 4.64 mm to about 5.16 mm, and wherein the average depth and diameter of the lower aperture of the recessed relief structures is about 4.88 mm and about 2.78 mm, respectively. 22. The composite radome wall structure according to claim 18, wherein the recessed relief structures are symmetrically positioned in a dense plurality of offset rows and columns. 23. The composite radome wall structure according to claim 22, wherein centers of adjacent recessed relief structures are separated from one another by between about 5.0 to about 7.0 mm. 24. The composite radome wall structure of claim 1, wherein the surface relief gratings comprise recessed relief structures comprised of an upper generally cylindrical recess and a lower generally cylindrical aperture having a smaller diameter than the upper generally cylindrical recess. 25. The composite radome wall structure according to claim 24, wherein the lower generally cylindrical aperture is concentrically positioned with respect to the recess. 26. A radome which comprises a radome wall structure of claim 1. 27. A radar system which comprises a radome of claim 26. 28. A method of making a composite radome wall structure comprising sandwiching an antiballistic solid, void-free internal core between antireflective (AR) external surface layers, wherein the antireflective external surface layers include a layer of material which comprises subwavelength surface (SWS) structures comprised of surface relief gratings with a size smaller than a wavelength of incident radiation. 29. The method of claim 28, which comprises consolidating the core and AR surface layers under elevated temperature and pressure for a sufficient time to obtain the composite radome wall structure. 30. The method of claim 29, wherein the step of consolidating the core and AR surface layers is practiced at a temperature of between 120° C. and 150° C. and a pressure of at least 50 bar.
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