CA1310573C - Protective electromagnetically transparent window - Google Patents
Protective electromagnetically transparent windowInfo
- Publication number
- CA1310573C CA1310573C CA000573921A CA573921A CA1310573C CA 1310573 C CA1310573 C CA 1310573C CA 000573921 A CA000573921 A CA 000573921A CA 573921 A CA573921 A CA 573921A CA 1310573 C CA1310573 C CA 1310573C
- Authority
- CA
- Canada
- Prior art keywords
- ptfe
- eptfe
- copolymer
- layers
- thermoplastic polymer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/02—Arrangements for de-icing; Arrangements for drying-out ; Arrangements for cooling; Arrangements for preventing corrosion
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/42—Housings not intimately mechanically associated with radiating elements, e.g. radome
- H01Q1/422—Housings not intimately mechanically associated with radiating elements, e.g. radome comprising two or more layers of dielectric material
Landscapes
- Laminated Bodies (AREA)
- Details Of Aerials (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
- Electrochromic Elements, Electrophoresis, Or Variable Reflection Or Absorption Elements (AREA)
Abstract
ABSTRACT OF THE INVENTION
A weather-, moisture, and gas-resistant radome and laminate for radomes comprising layers of porous expanded polytetrafluoroethylene (EPTFE) membrane, fluorinated thermoplastic membrane, and woven EPTFE textile backing fabric. Superior electromagnetically transmission characteristics, excellent physical and electrical properties.
A weather-, moisture, and gas-resistant radome and laminate for radomes comprising layers of porous expanded polytetrafluoroethylene (EPTFE) membrane, fluorinated thermoplastic membrane, and woven EPTFE textile backing fabric. Superior electromagnetically transmission characteristics, excellent physical and electrical properties.
Description
~ 3 ~ 3 FIELD OF THE INVENT~QN
The present inventlon relates to covering and protecting radio antenna such as radar antennas, against weather and moisture, while remaining electromagnetically transparent.
BACKGROUND OF THE INVENTION
Large radio antennas, such as radar installations and rad~o telescopes, often need a covering structure of some kind to protect them from the weather, i.e. sunl~ght, w~nd, and molsture and which w1ll preferably be gas tight, this covering structure is ref~red to as a radome. One type of radome ls an ~nflatable radome. In this case, a gas-tight balloon shrouds the antenna. A blower lnflates the balloon and spaces the structure away from the antenna so that the antenna may move or rotate freely. A popular form of such covering ls the geodeslc dome or metal space frame radome, which ~s formed from many metal (or other structural material~ geometric shaped segments, such as tr1angles and others, which are covered wlth an appropriate rad~o frequency transm~ttiny membrane, then affixed to each other to form an approxlmately spherlcal dome surround~n~ the radar antenna, ~whieh rotates or ~ov-es ins~de the radome. Pos~tive gas pressure ~sinot requ~red ~nslde the m~tal space frame radome, but may be useful at times, for example, to d~slodge snow from the outside of the dome, or to aid in controlling the environment with1n the dome. Another type of installation has solid segmented covering doors over the radio antenna which open to allow the antenna to functlon through the opening.
13~7~
On each s~de of the opening ~s aff1xed a semicircular track, up which is drawn each edge of a large, nearly electromagnet~cally transparent sheet of protectlve membrane to cover the antenna while in use. Other forms of antennas can also be suitably covered by such membranes held above or affixed around them ln various ways to kPep out moisture and the effects of weather.
While useful ln varying degrees, the various forms and compositions of membrane hitherto known in the art, such as polytetrafluoroethylene fiber-glass lam~nates, have not solved all of the problems associated with use of th~s type of covering for protect~ng radio antennas.
BRIEF SUMMARY QF THE PRESENT INVENTION
The present ~nvent~on 1s a ~eather -, mo~sture -, and gas - reslstant structure for enclosing and protect~ng a rad~o antenna having super1Or electromagnetlc transm~ss1On characterlstics and physical propertles, which lS ~ncludes a layer of a lam~nate, wh~ch comprlses adhered layers of polytetrafluoroethylene (PTFE) membrane, thermoplast~c polymer, and backing ~abric o~ woven f~bers of PTFE. The preferred membranes and f1bers are of porous PTFE and preferably of porous expanded PTFE (EPTFE) prepared as descr1bed ln U.S. Patents 3,953,566, 4,096,227, 4,187,390 4,110,392, 4,025,679, 3,962,153, and 4,482,516.
-~31~
BRIEF DESCRIPTION OF THE DRAWIN~
F~gure l ~s a cross-section of a preferred laminate of th0 ~nvention.
Figure 2 depicts a broken vlew of a space frame radome covering and protecting a rotating radio antenna.
Figure 3 shows a radio telescope housing, where shutter and doors are drawn aside and a coverlng sheet of composite membrane ls being drawn over the antenna.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
The preferred embodiments o~ the present invent~on can best be described ~n terms of the draw1ngs. Flgure l describes a lam~nate l of the invention in cross-s~ction to show the var~ous layers. The outer layer 2 ~s formed from PTFE, preferably porous PTFE, and most preferably EPTFE, the porous expanded PTFE membrane mater~al made by stretchlng PTFE ln the manner described ln the U.S. patents llsted above. EPTFE has superior dielectric constant and loss tangent characterlstlcs thus a~d~ng electromagnetic transmiss~on. Outer layer 2 is bonde~ by ~èans of a thermoplast~c polymer layer ~ to a second layer 2 of EPTFE wh~ch has previously been adhered or bonded to a text~le back~ng layer 4 comprising woven fibers of PTFE. Here again, the preferred form of PTFE ls EPTFE.
, , -':, ' ~ ., . , :
13~ ~7~
Layer 3 of thermoplast;c polymer is preferably a fluorinated ethylene-propylene co-polymer (FEP), but other fluor~nated thermoplastlc polymers might be used where their PTFE-adhes~ve properties, radar wavelength transparency, and gas-resistant propertles are sui-table for use in the particular laminate being prepared. Other non-fluorinated thermoplast~c polymers may be used for layer 3 where they meet the criteria of sufficlent adhesiveness, electromagnetic transmlssion characteristics, and gas-proofness or gas-resistance to be adequately functional and useful.
Useful thermoplastlc polymers may ~nclude perfluoroalkoxytetrafluoroethylene polymers, ethylene-tetrafluorofluoro0thylene copolymers, copolymers of vlnyl~dene fluoride and hexafluoropropylene, polychlorotrtfluoroethylene, copolymer of hexafluoropropylene and tetrafluoroethylen~, polyethylene, and polypropylene. Layer 4 ls a woven t~xt~le backing fabr~c for the lamlnate where the f~bers are PTFE, preferably porous PTFE, and most preferably EPTFE. Layer 4 provides strength propertles to the laminate, and additional layers of thls materlal may be added where an ~ncrease ln laminate strength ~ ~s needed and des~red.
~ he woven PTFE or EPTFE fabr~c is coated ~th commerc~ally ava~lable PTFE dispersion or ther~oplastk polymer d~sperslon to about three to ten percent by we~ght d~spersed PTFE add-on and lam~nated to an EPTFE film under hot p~nch-roll condlt10ns under pressure. Another EPTFE membran~ 1s adhered to FEP f~lm under heat and pressure. The FEP slde of th~s second lam~nate 1s then lamlnated to the EPTFE s~de of the first 1am1nate by hot pressure roll1ng to form a four-layer laminate, such as that deplcted In cross-sect~on ln Figure 1. Add1t~onal palrs of layers 2 and 3 may be laminated to the EPTFE face of the laminate in llke manner, ~f desired, to change the electromagnetic transmiss~on character~st1cs or gas resistance.
13~73 Some var~atlon among the fluorinated thermoplastics ava~lable for layer 3 may be ut~llzed as well to adjust the electromagnetic transmisslon character~st~cs and frequency demand. The laminate provldes slgn~f~cant gas-res~stance or gas-proof properties associated with the thermoplastic layer (or layers) so as to be useful for positive pressure type structures in which gas pressure w~thin the dome or shelter holds the coverlng away from the rotat~ng or movlng parts of the antenna housed therein.
F~gure 2 shows a large metal space frame radome fsr shelterlng and enclos~ng a rad~o antenna 5. The segments 6 of the dome have been made by covering geometr~c shaped frames, usually of metal or other stlff constructlon mater~als such as metal or plastic tub~ng or shaped bar stock, w~h laminate of thls lnvention. Segments ~ are then assembled 1nto a radome as shown. Other methods for maklng such a frame, not lnvolv~ng geometric segments, can be made to serve as well and other methods for coverlng the domes w~th the lamlnate l of the ~nvention may be used.
F~gure 3 dep~cts a dtfterent type of housing or shelter for a rad1O
antenna 9, ~n wh1ch the ent~re housing revolves; a roof shutter 7 and doors 8 roll out of the way of antenna 9, and a large shelter~ng sheet ll of compos~te membrane of the 1nvent~on ~s drawn up track lO to which ~t ~s attached at each end to protect the antenna wh1le ~t ~s ~n use. Sheet ll of F19ure 3 and the coverlng ~ of each segment of the geodes~c dome of Flgure 2 each embody one form of the present invent~on. Other shapes and forms of shelter or cover for antennas w~ll no doubt come to m~nd to one experienced ~n the art of rad~o antennas, radomes, and any view~ng aperture ~n an ex~sting build1ng, but so long as the lam~nates of th1s ~nvent~on are utlllzed, thls ~nvent~on ~s be~ng practiced.
.
:
~31 ~rl3 The lamlnates are ~nert to and unaffected by the elements, 1ncluding sunl~ght, ozone, temperature extremes, wind, rain, and snow, and are inert, hydrophob~c and gas-res~stant. They are very th~n and strong, have excellent color reflectance and electromagnetic transmission, low dielectric S constant, and low loss tangent. The laminates when used in radomes reduce maintenance costs, prov~de lower cost structural enclosures, allow more accurate measurements, and prov~de for ~ncreased viewing t~me, do not need to be palnted or otherw~se mainta~ned as do other mater~als, and have low adheslon and excellent release for snow and lce whlch might form on the surface of the radome. The lamlnates may be useful ~n protective garments for protect~on agalnst chemicals or corros~ve media or atmospheres, as flange covers 1n chem1cal manufactur~ng plants, and ~n arch~tectual structures.
The present inventlon relates to covering and protecting radio antenna such as radar antennas, against weather and moisture, while remaining electromagnetically transparent.
BACKGROUND OF THE INVENTION
Large radio antennas, such as radar installations and rad~o telescopes, often need a covering structure of some kind to protect them from the weather, i.e. sunl~ght, w~nd, and molsture and which w1ll preferably be gas tight, this covering structure is ref~red to as a radome. One type of radome ls an ~nflatable radome. In this case, a gas-tight balloon shrouds the antenna. A blower lnflates the balloon and spaces the structure away from the antenna so that the antenna may move or rotate freely. A popular form of such covering ls the geodeslc dome or metal space frame radome, which ~s formed from many metal (or other structural material~ geometric shaped segments, such as tr1angles and others, which are covered wlth an appropriate rad~o frequency transm~ttiny membrane, then affixed to each other to form an approxlmately spherlcal dome surround~n~ the radar antenna, ~whieh rotates or ~ov-es ins~de the radome. Pos~tive gas pressure ~sinot requ~red ~nslde the m~tal space frame radome, but may be useful at times, for example, to d~slodge snow from the outside of the dome, or to aid in controlling the environment with1n the dome. Another type of installation has solid segmented covering doors over the radio antenna which open to allow the antenna to functlon through the opening.
13~7~
On each s~de of the opening ~s aff1xed a semicircular track, up which is drawn each edge of a large, nearly electromagnet~cally transparent sheet of protectlve membrane to cover the antenna while in use. Other forms of antennas can also be suitably covered by such membranes held above or affixed around them ln various ways to kPep out moisture and the effects of weather.
While useful ln varying degrees, the various forms and compositions of membrane hitherto known in the art, such as polytetrafluoroethylene fiber-glass lam~nates, have not solved all of the problems associated with use of th~s type of covering for protect~ng radio antennas.
BRIEF SUMMARY QF THE PRESENT INVENTION
The present ~nvent~on 1s a ~eather -, mo~sture -, and gas - reslstant structure for enclosing and protect~ng a rad~o antenna having super1Or electromagnetlc transm~ss1On characterlstics and physical propertles, which lS ~ncludes a layer of a lam~nate, wh~ch comprlses adhered layers of polytetrafluoroethylene (PTFE) membrane, thermoplast~c polymer, and backing ~abric o~ woven f~bers of PTFE. The preferred membranes and f1bers are of porous PTFE and preferably of porous expanded PTFE (EPTFE) prepared as descr1bed ln U.S. Patents 3,953,566, 4,096,227, 4,187,390 4,110,392, 4,025,679, 3,962,153, and 4,482,516.
-~31~
BRIEF DESCRIPTION OF THE DRAWIN~
F~gure l ~s a cross-section of a preferred laminate of th0 ~nvention.
Figure 2 depicts a broken vlew of a space frame radome covering and protecting a rotating radio antenna.
Figure 3 shows a radio telescope housing, where shutter and doors are drawn aside and a coverlng sheet of composite membrane ls being drawn over the antenna.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
The preferred embodiments o~ the present invent~on can best be described ~n terms of the draw1ngs. Flgure l describes a lam~nate l of the invention in cross-s~ction to show the var~ous layers. The outer layer 2 ~s formed from PTFE, preferably porous PTFE, and most preferably EPTFE, the porous expanded PTFE membrane mater~al made by stretchlng PTFE ln the manner described ln the U.S. patents llsted above. EPTFE has superior dielectric constant and loss tangent characterlstlcs thus a~d~ng electromagnetic transmiss~on. Outer layer 2 is bonde~ by ~èans of a thermoplast~c polymer layer ~ to a second layer 2 of EPTFE wh~ch has previously been adhered or bonded to a text~le back~ng layer 4 comprising woven fibers of PTFE. Here again, the preferred form of PTFE ls EPTFE.
, , -':, ' ~ ., . , :
13~ ~7~
Layer 3 of thermoplast;c polymer is preferably a fluorinated ethylene-propylene co-polymer (FEP), but other fluor~nated thermoplastlc polymers might be used where their PTFE-adhes~ve properties, radar wavelength transparency, and gas-resistant propertles are sui-table for use in the particular laminate being prepared. Other non-fluorinated thermoplast~c polymers may be used for layer 3 where they meet the criteria of sufficlent adhesiveness, electromagnetic transmlssion characteristics, and gas-proofness or gas-resistance to be adequately functional and useful.
Useful thermoplastlc polymers may ~nclude perfluoroalkoxytetrafluoroethylene polymers, ethylene-tetrafluorofluoro0thylene copolymers, copolymers of vlnyl~dene fluoride and hexafluoropropylene, polychlorotrtfluoroethylene, copolymer of hexafluoropropylene and tetrafluoroethylen~, polyethylene, and polypropylene. Layer 4 ls a woven t~xt~le backing fabr~c for the lamlnate where the f~bers are PTFE, preferably porous PTFE, and most preferably EPTFE. Layer 4 provides strength propertles to the laminate, and additional layers of thls materlal may be added where an ~ncrease ln laminate strength ~ ~s needed and des~red.
~ he woven PTFE or EPTFE fabr~c is coated ~th commerc~ally ava~lable PTFE dispersion or ther~oplastk polymer d~sperslon to about three to ten percent by we~ght d~spersed PTFE add-on and lam~nated to an EPTFE film under hot p~nch-roll condlt10ns under pressure. Another EPTFE membran~ 1s adhered to FEP f~lm under heat and pressure. The FEP slde of th~s second lam~nate 1s then lamlnated to the EPTFE s~de of the first 1am1nate by hot pressure roll1ng to form a four-layer laminate, such as that deplcted In cross-sect~on ln Figure 1. Add1t~onal palrs of layers 2 and 3 may be laminated to the EPTFE face of the laminate in llke manner, ~f desired, to change the electromagnetic transmiss~on character~st1cs or gas resistance.
13~73 Some var~atlon among the fluorinated thermoplastics ava~lable for layer 3 may be ut~llzed as well to adjust the electromagnetic transmisslon character~st~cs and frequency demand. The laminate provldes slgn~f~cant gas-res~stance or gas-proof properties associated with the thermoplastic layer (or layers) so as to be useful for positive pressure type structures in which gas pressure w~thin the dome or shelter holds the coverlng away from the rotat~ng or movlng parts of the antenna housed therein.
F~gure 2 shows a large metal space frame radome fsr shelterlng and enclos~ng a rad~o antenna 5. The segments 6 of the dome have been made by covering geometr~c shaped frames, usually of metal or other stlff constructlon mater~als such as metal or plastic tub~ng or shaped bar stock, w~h laminate of thls lnvention. Segments ~ are then assembled 1nto a radome as shown. Other methods for maklng such a frame, not lnvolv~ng geometric segments, can be made to serve as well and other methods for coverlng the domes w~th the lamlnate l of the ~nvention may be used.
F~gure 3 dep~cts a dtfterent type of housing or shelter for a rad1O
antenna 9, ~n wh1ch the ent~re housing revolves; a roof shutter 7 and doors 8 roll out of the way of antenna 9, and a large shelter~ng sheet ll of compos~te membrane of the 1nvent~on ~s drawn up track lO to which ~t ~s attached at each end to protect the antenna wh1le ~t ~s ~n use. Sheet ll of F19ure 3 and the coverlng ~ of each segment of the geodes~c dome of Flgure 2 each embody one form of the present invent~on. Other shapes and forms of shelter or cover for antennas w~ll no doubt come to m~nd to one experienced ~n the art of rad~o antennas, radomes, and any view~ng aperture ~n an ex~sting build1ng, but so long as the lam~nates of th1s ~nvent~on are utlllzed, thls ~nvent~on ~s be~ng practiced.
.
:
~31 ~rl3 The lamlnates are ~nert to and unaffected by the elements, 1ncluding sunl~ght, ozone, temperature extremes, wind, rain, and snow, and are inert, hydrophob~c and gas-res~stant. They are very th~n and strong, have excellent color reflectance and electromagnetic transmission, low dielectric S constant, and low loss tangent. The laminates when used in radomes reduce maintenance costs, prov~de lower cost structural enclosures, allow more accurate measurements, and prov~de for ~ncreased viewing t~me, do not need to be palnted or otherw~se mainta~ned as do other mater~als, and have low adheslon and excellent release for snow and lce whlch might form on the surface of the radome. The lamlnates may be useful ~n protective garments for protect~on agalnst chemicals or corros~ve media or atmospheres, as flange covers 1n chem1cal manufactur~ng plants, and ~n arch~tectual structures.
Claims (11)
1. A weather-, moisture-, and gas-resistant electromagnetic window structure for enclosing and protecting a radio antenna including a layer of laminate, comprising adhered layers of (a) polytetrafluoroethylene (PTFE) membrane, (b) thermoplastic polymer, (c) a second layer of PTFE membrane, and (d) a backing fabric, comprising woven fibers of PTFE.
2. A structure of Claim 1, wherein the first and second layers of PTFE
are porous.
are porous.
3. A structure of Claim 2, wherein the first and second layers of PTFE
are porous expanded PTFE (EPTFE).
are porous expanded PTFE (EPTFE).
4. A structure of Claim 3, wherein the backing fabric is EPTFE.
5. A structure of Claim 4, wherein the thermoplastic polymer is a fluorinated ethylene-propylene co-polymer (FEP).
6. A structure of Claim 5, wherein the thermoplastic polymer is selected from perfluoroalkoxy tetrafluoroethylene (PFA), ethylene-tetrafluoroethylene, copolymers, copolymer of vinylidene fluoride and chlorotrifluoroethylene, copolymers of vinylidene fluoride and hexafluoropropylene, polychlorotrifluoroethylene, copolymer of hexafluoropropylene and tetrafluoroethylene, polyethylene, and polypropylene .
7. A process for protecting a radio antenna from weather and moisture, comprising the steps of covering said structure at a specified distance from said antenna with a gas-resistant multilayer laminate, comprising in order layers of PTFE membrane, thermoplastic polymer, PTFE membrane, and woven PTFE textile backing fabric.
8. A process of Claim 7, wherein said PTFE membrane layers are EPTFE.
9. A process of Claim 8, wherein said backing fabric is EPTFE.
10. A process of Claim 9, wherein said thermoplastic polymer is FEP.
11. A process of Claim 9, wherein said thermoplastic polymer is selected from PFA, ethylene-tetrafluoroethylene copolymer, copolymer of vinylidene fluoride and chlorotrifluoroethylene, copolymer of vinylidene fluoride and hexafluoropropylene, polychlorotrifluoroethylene, copolymer of hexafluoropropylene and tetrafluoroethylene, polyethylene, and polypropylene.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US8374687A | 1987-08-06 | 1987-08-06 | |
| US083,746 | 1993-06-25 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1310573C true CA1310573C (en) | 1992-11-24 |
Family
ID=22180425
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000573921A Expired - Fee Related CA1310573C (en) | 1987-08-06 | 1988-08-05 | Protective electromagnetically transparent window |
Country Status (16)
| Country | Link |
|---|---|
| EP (1) | EP0302596B1 (en) |
| JP (2) | JP2642958B2 (en) |
| KR (1) | KR890004466A (en) |
| CN (1) | CN1015414B (en) |
| AT (1) | ATE86411T1 (en) |
| AU (1) | AU603900B2 (en) |
| CA (1) | CA1310573C (en) |
| DE (1) | DE3878777T2 (en) |
| DK (1) | DK438988A (en) |
| ES (1) | ES2038293T3 (en) |
| FI (1) | FI90928C (en) |
| GB (1) | GB2207814A (en) |
| IE (1) | IE62504B1 (en) |
| IS (1) | IS1500B (en) |
| NO (1) | NO173962C (en) |
| PT (1) | PT88153A (en) |
Families Citing this family (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2250804B (en) * | 1990-11-07 | 1994-06-01 | Colebrand Ltd | Protective device for a sensing head |
| US5217797A (en) * | 1992-02-19 | 1993-06-08 | W. L. Gore & Associates, Inc. | Chemically resistant diaphragm |
| WO1994001899A1 (en) * | 1992-07-02 | 1994-01-20 | W. L. Gore & Associates, Inc. | Sealing frame and protective membrane for a radar dish or horn |
| US5904978A (en) * | 1995-12-15 | 1999-05-18 | W. L. Gore & Associates, Inc. | Electrically conductive polytetrafluoroethylene article |
| EP0786823A1 (en) * | 1996-01-22 | 1997-07-30 | W.L. GORE & ASSOCIATES, INC. | Non-woven electro-magnetically transparent material |
| FR2753007B1 (en) * | 1996-09-04 | 1998-11-27 | Bourquin Patrick | SATELLITE RECEPTION ANTENNA |
| JP2000500953A (en) * | 1996-09-13 | 2000-01-25 | ダブリュ．エル．ゴア アンド アソシエイツ，インコーポレイティド | Satellite dish cover |
| US5947918A (en) * | 1996-11-18 | 1999-09-07 | Gore Enterprise Holdings, Inc. | Impact energy absorbing composite materials |
| US5945217A (en) * | 1997-10-14 | 1999-08-31 | Gore Enterprise Holdings, Inc. | Thermally conductive polytrafluoroethylene article |
| US6770577B2 (en) * | 2001-10-29 | 2004-08-03 | Gore Enterprise Holdings, Inc. | Architectural fabric |
| NL1026919C2 (en) * | 2004-08-27 | 2006-02-28 | Nedap Agri B V | Ultra-wide-band system for determining animals. |
| CA2713980C (en) | 2008-02-05 | 2013-06-25 | Saint-Gobain Performance Plastics Corporation | A multi-layer barrier article |
| CN101364669B (en) * | 2008-09-25 | 2012-08-29 | 东华大学 | Polyethylene reinforced radar cowl of ultra-high molecular weight, preparation and application thereof |
| JP5498501B2 (en) * | 2008-11-12 | 2014-05-21 | サン−ゴバン パフォーマンス プラスティックス コーポレイション | Barrier structure and manufacturing method thereof |
| US8859102B2 (en) | 2008-11-12 | 2014-10-14 | Saint-Gobain Performance Plastics Corporation | Barrier structure and method for making |
| TWI397620B (en) * | 2010-06-30 | 2013-06-01 | Method for Making Tensile Teflon (ePTFE) Line | |
| US10450697B2 (en) | 2014-09-16 | 2019-10-22 | Dsm Ip Assets B.V. | Space frame radome comprising a polymeric sheet |
| CN109462003A (en) * | 2018-10-11 | 2019-03-12 | 江苏三和欣创通信科技有限公司 | A kind of measurement antenna system based on full frequency band |
| CN110808465B (en) * | 2019-09-27 | 2021-02-02 | 浙江瑞堂塑料科技股份有限公司 | High-wave-transmittance radome and preparation process thereof |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA962021A (en) * | 1970-05-21 | 1975-02-04 | Robert W. Gore | Porous products and process therefor |
| US4025679A (en) * | 1976-08-06 | 1977-05-24 | W. L. Gore & Associates, Inc. | Fibrillated polytetrafluoroethylene woven filter fabric |
| JPS56110304A (en) * | 1980-02-05 | 1981-09-01 | Mitsubishi Electric Corp | Film material for radome |
| JPS5925808U (en) * | 1982-08-04 | 1984-02-17 | 三菱樹脂株式会社 | Cover for parabolic antenna |
| JPS6082813U (en) * | 1983-11-14 | 1985-06-08 | 日東電工株式会社 | Antenna reflector cover structure |
| DE3410503A1 (en) * | 1984-03-22 | 1986-01-02 | Dornier System Gmbh, 7990 Friedrichshafen | METHOD FOR PRODUCING RADOMAS |
| DE3410501C2 (en) * | 1984-03-22 | 1990-09-13 | Dornier System Gmbh, 7990 Friedrichshafen | Radome material |
| US4615933A (en) * | 1984-04-06 | 1986-10-07 | Rogers Corporation | Radome structure and method of manufacture thereof |
| DE3421196A1 (en) * | 1984-06-07 | 1985-12-19 | Dornier System Gmbh, 7990 Friedrichshafen | Radome material |
| JPS6286714U (en) * | 1985-11-20 | 1987-06-03 |
-
1988
- 1988-06-08 AU AU17508/88A patent/AU603900B2/en not_active Ceased
- 1988-07-04 ES ES198888306093T patent/ES2038293T3/en not_active Expired - Lifetime
- 1988-07-04 AT AT88306093T patent/ATE86411T1/en not_active IP Right Cessation
- 1988-07-04 EP EP88306093A patent/EP0302596B1/en not_active Expired - Lifetime
- 1988-07-04 GB GB08815837A patent/GB2207814A/en not_active Withdrawn
- 1988-07-04 DE DE8888306093T patent/DE3878777T2/en not_active Expired - Fee Related
- 1988-07-29 FI FI883578A patent/FI90928C/en not_active IP Right Cessation
- 1988-07-29 PT PT88153A patent/PT88153A/en not_active Application Discontinuation
- 1988-08-01 JP JP63190730A patent/JP2642958B2/en not_active Expired - Fee Related
- 1988-08-02 NO NO883421A patent/NO173962C/en unknown
- 1988-08-03 IE IE236788A patent/IE62504B1/en not_active IP Right Cessation
- 1988-08-04 IS IS3379A patent/IS1500B/en unknown
- 1988-08-05 CA CA000573921A patent/CA1310573C/en not_active Expired - Fee Related
- 1988-08-05 DK DK438988A patent/DK438988A/en not_active Application Discontinuation
- 1988-08-06 CN CN88104934A patent/CN1015414B/en not_active Expired
- 1988-08-06 KR KR1019880010068A patent/KR890004466A/en not_active Application Discontinuation
-
1995
- 1995-09-26 JP JP7247849A patent/JP2662381B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| KR890004466A (en) | 1989-04-22 |
| IS3379A7 (en) | 1989-02-07 |
| DE3878777T2 (en) | 1993-06-09 |
| CN1015414B (en) | 1992-02-05 |
| IE62504B1 (en) | 1995-02-08 |
| CN1031050A (en) | 1989-02-15 |
| JP2642958B2 (en) | 1997-08-20 |
| IS1500B (en) | 1992-07-30 |
| NO883421D0 (en) | 1988-08-02 |
| DK438988D0 (en) | 1988-08-05 |
| FI883578A (en) | 1989-02-07 |
| NO883421L (en) | 1989-02-07 |
| NO173962B (en) | 1993-11-15 |
| DK438988A (en) | 1989-02-07 |
| JP2662381B2 (en) | 1997-10-08 |
| AU603900B2 (en) | 1990-11-29 |
| ES2038293T3 (en) | 1993-07-16 |
| FI90928C (en) | 1994-04-11 |
| GB2207814A (en) | 1989-02-08 |
| FI90928B (en) | 1993-12-31 |
| JPH01114101A (en) | 1989-05-02 |
| EP0302596B1 (en) | 1993-03-03 |
| DE3878777D1 (en) | 1993-04-08 |
| IE882367L (en) | 1989-02-06 |
| PT88153A (en) | 1989-06-30 |
| FI883578A0 (en) | 1988-07-29 |
| EP0302596A1 (en) | 1989-02-08 |
| NO173962C (en) | 1994-02-23 |
| JPH08181522A (en) | 1996-07-12 |
| AU1750888A (en) | 1989-02-09 |
| GB8815837D0 (en) | 1988-08-10 |
| ATE86411T1 (en) | 1993-03-15 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKLA | Lapsed |