CN1031050A - Electromgnetically-transparent structure - Google Patents
Electromgnetically-transparent structure Download PDFInfo
- Publication number
- CN1031050A CN1031050A CN88104934A CN88104934A CN1031050A CN 1031050 A CN1031050 A CN 1031050A CN 88104934 A CN88104934 A CN 88104934A CN 88104934 A CN88104934 A CN 88104934A CN 1031050 A CN1031050 A CN 1031050A
- Authority
- CN
- China
- Prior art keywords
- ptfe
- film
- thermoplastic polymer
- antenna
- eptfe
- 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.)
- Withdrawn
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)
- Electrochromic Elements, Electrophoresis, Or Variable Reflection Or Absorption Elements (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
Abstract
A kind ofly be used to surround and protect antenna for radio astronomy to avoid the influence of weather, moisture and be airtight Electromgnetically-transparent structure; it comprises laminated construction; the latter comprises each adhesion layer that the polytetrafluoroethylene (PTFE) film is formed; the thermoplastic polymer, the second layer of forming by the PTFE film and the substrate fabric that constitutes by the PTFE braided fiber.
Description
The present invention relates to a kind ofly be used to hide and protect the antenna for radio astronomy that resembles radar and so on to avoid the influence of weather and moisture, simultaneously, keep the structure of Electromgnetically-transparent state.
Various antennas for radio astronomy such as radar equipment and radio telescope often need certain covering structure to avoid weather to protect it, i.e. the influence of Exposure to Sunlight, wind and moisture, thereby this structure is preferably airtight; This covering structure is called as radome.Inflatable radome is exactly a kind of of radome.In this case, antenna is covered by a kind of airtight balloon.Can be by compressor to balloon inflation, and this structure and antenna are separated, so that antenna can freely move or rotate.The common form of this masking structure is geodesic dome or metal space framework, it is made up of the cutting part branch of how much (such as triangle or the like) shapes of many metals (or other structural material), these partitioning portions are topped suitable radio frequency transmission film, and be connected to each other and surround the spherical calotte vault of this radar antenna with formation, this radar antenna can move in this antenna house or rotate.In this metal space framework antenna house, do not need positive air pressure; But, sometimes for the accumulated snow of removing the vault outside or for helping the environmental condition in the control vault, this positive air pressure may be useful.The another kind of pattern of this device has the door closure of plurality of integral segmentation above antenna for radio astronomy; Open these door closures, antenna just can see through aperture of door and work.
Be connected with half circular guideway in the both sides of this aperture of door, when the same day, the lineman did, upwards draw the big diaphragm of opening that electromagnetic wave is close to transmission along guide rail, so that cover antenna.Other various forms of antennas also can be in every way, is contained in film above it or that be fixed on around it and covers with this, to get rid of the influence of moisture and weather.
Though; so far known various different film modes and compositions such as polytetrafluoroethylene (PTFE) glass fibre lamination are being useful in varying degrees in prior art; but they are unresolved about using this mode of covering to protect all problems of antenna for radio astronomy.
The invention provides a kind of airtight, be not subjected to weather, the moisture influence, be used to surround and protect the Electromgnetically-transparent structure of antenna for radio astronomy, it comprises a kind of lamination, the latter comprises each adhesion layer of being made up of the polytetrafluoroethylene (PTFE) film, the thermoplastic polymer, the film and the fiber of the second layer of being made up of the PTFE film and substrate fabric the best of being become by PTFE fibrage are prepared by porous PTFE, and it would be desirable by porous, expanded PTFE (EPTFE) preparation, as the 3rd, 953,566; 4,096,227; 4,187,390; 4,110,392,4,025,679; 3,962,153 and 4,482, described in No. 516 United States Patent (USP)s.
Now give an example, describe the present invention with reference to each accompanying drawing, in each accompanying drawing:
Fig. 1 is the profile according to best lamination of the present invention;
Fig. 2 is a kind of partial sectional view that covers and protect the space frame radome that rotates antenna for radio astronomy.
Fig. 3 illustrates a radio telescope outer cover, and among the figure, valve and Ge Men draw back to the next door, and, hide overcoat antenna, that make by built up membrane and leave behind.
Fig. 1 illustrates according to laminated construction 1 of the present invention with the profile of representing variant layer.Its skin 2 by polytetrafluoroethylene (PTFE), preferably the most desirable by porous PTFE be to make by porous, expanded EPTFE.EPTFE is exactly with the method described in above-mentioned each United States Patent (USP), the porous, expanded PTFE thin-film material made from the PTFE that stretches.EPTFE has excellent dielectric constant and loss angle tangent characteristic, thereby helps electromagnetic transmission.Outer 2 is to be bonded to the second layer of being made by EPTFE 2 with one deck thermoplastic polymer layer 3, and the latter has adhered in advance or has been bonded on the textile substrate layer 4, and this textile substrate layer comprises the PTFE textile fabric.Best herein PTFE form or EPTFE.
Layer 3 fluorinated ethylene-propylene copolymer of making by the thermoplastic polymer (FEP) preferably; But, also can use other to fluoridize the thermoplastic polymer, as long as their PTFE-adhesion characteristics, radar wave transmittance and air-tightness are applicable to that all the specific laminated construction that will prepare gets final product.Also can use other nonfluorinateds thermoplastic polymer, as long as they satisfy electromagnetic wave transmission characteristic, indexs such as enough adhesivenesses and air tightness get final product to possess suitable function.Various useful thermoplastic polymers can comprise: perfluoro alkoxy-tetrafluoro ethylene polymer, ethylene-tetrafluoroethylene copolymer, by hexafluoropropene and the synthetic copolymer of vinylidene fluoride, polytrifluorochloroethylene, by hexafluoropropene and synthetic copolymer, polyethylene or the polypropylene of tetrafluoroethene.Layer 4 is braided fiber substrate fabrics of lamination, and fiber wherein all is PTFE, preferably porous PTFE and optimal situation is EPTFE.4 pairs of this lamination of layer provide intensity; And when needs increase laminated construction intensity, can add some extra plays of making by this material.
The PTFE of this braiding or EPTFE fabric scribble commercial PTFE dispersion paints or thermoplastic polymer's dispersion paints, are coated onto the increment of about 3 to 10% (by weight), and build up the EPTFE film under the hot-rolling of pressurization.In heating with add to depress another kind of EPTFE film is adhered on the FEP film.So, be added on the EPTFE one side of first lamination by the hot pressing roller, with the four stacked tunics of formation as cross-section structure shape given among Fig. 1 with the FEP of these mat woven of fine bamboo strips two laminations one side.When needing, can fold each on the EPTFE of this lamination one side equally to layer 2 and layer 3, to change its electromagnetic wave transmission characteristic or air tightness.
Some modification that can be used among layer 3 the various fluorinated thermoplastic plastics also can be used to regulate electromagnetic wave transmission characteristic and frequency definite value.This lamination can provide the air tightness that interrelates with thermoplastic layer (or several layers), for use in the positive pressure type structure, in this structure, the air pressure in its vault or the maskant makes this maskant away from the mobile or rotatable parts of being accommodated the antenna in it.
Fig. 2 illustrates a large-scale metal space framework radome that is used to surround and shelter radio-frequency antenna 5.Each partitioning portion 6 of this vault all constitutes with the framework that lamination of the present invention covers each geometry, these frameworks all are that for example the bar of metal or plastic tube or moulding is made by metal or other rigid structure material.Radome shown in each partitioning portion 6 is combined into then.Also can adopt and not involve additive method how much partitioning portions, that use this framework and other covers the method for vault with lamination of the present invention.
Fig. 3 draws a kind of dissimilar outer cover that is used for antenna for radio astronomy 9 or maskant; wherein; whole outer cover is rotatable; roof valve 7 and Ge Men 8 can produce the passage of antenna 9; simultaneously; open upwards traction of masking films 11 to what made by built up membrane of the present invention greatly along guide rail 10, so that the antenna of protection in using, this masking film is to be attached on the guide rail 10 of both sides.
These laminations are inactive for comprising the factors such as Exposure to Sunlight, ozone, various temperature extremes value, wind, rain and snow, thereby not affected by it, and are hydrophobic and bubble-tight. They are thin and intensity is big, have good chromatic reflectance and Electromgnetically-transparent rate, low dielectric constant and low loss tangent. When being used for radome; these laminations have reduced maintenance cost, lower-cost cover structure is provided, can have made various measurements more accurate; and be provided the observing time of growth, need not paint or but can be protected as coating other material on the contrary; and; for the ice and snow that may be accumulated on the antenna house, have little adhesion and the fabulous effect of freeing.
Claims (6)
1. Electromgnetically-transparent structure that is used to surround and protect antenna for radio astronomy; this structure can not be subjected to the influence of weather, moisture; and be airtight; it comprises laminated construction; it is characterized in that it comprises: each adhesion layer of forming by the polytetrafluoroethylene (PTFE) film; the thermoplastic polymer, the second layer of forming by the PTFE film and by the substrate fabric of PTFE fibrage.
2. according to the structure of claim 1, it is characterized in that: described first and second layers of being made by PTFE all are porous.
3. according to the structure of claim 2, it is characterized in that: the described ground floor and the mat woven of fine bamboo strips of being made up of PTFE all is porous, expanded PTFE (EPTFE) for two layers.
4. according to the structure of claim 3, it is characterized in that: described substrate fabric is EPTFE.
5. according to the structure of claim 4, it is characterized in that: described thermoplastic polymer is a kind of ethylene fluoride copolymer (FEP).
6. according to the structure of claim 5, it is characterized in that: described thermoplastic polymer is perfluoro alkoxy tetrafluoroethene (FPA), ethylene-tetrafluoroethylene copolymer, by vinylidene fluoride and the synthetic copolymer of CTFE, by vinylidene fluoride and the synthetic copolymer of hexafluoropropene, polytrifluorochloroethylene is by hexafluoropropene and synthetic copolymer, polyethylene or the polypropylene of tetrafluoroethene.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US8374687A | 1987-08-06 | 1987-08-06 | |
| US083746 | 1987-08-06 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1031050A true CN1031050A (en) | 1989-02-15 |
| CN1015414B CN1015414B (en) | 1992-02-05 |
Family
ID=22180425
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN88104934A Expired CN1015414B (en) | 1987-08-06 | 1988-08-06 | Electromgnetically-transparent structure |
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) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100564026C (en) * | 2001-10-29 | 2009-12-02 | 戈尔企业控股股份有限公司 | architectural fabric |
| 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 |
| CN106715785A (en) * | 2014-09-16 | 2017-05-24 | 帝斯曼知识产权资产管理有限公司 | Space frame radome comprising a polymeric sheet |
| CN110808465A (en) * | 2019-09-27 | 2020-02-18 | 浙江瑞堂塑料科技股份有限公司 | High-wave-transmittance radome and preparation process thereof |
Families Citing this family (15)
| 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 |
| WO1998016967A1 (en) * | 1996-09-13 | 1998-04-23 | W.L. Gore & Associates, Inc. | 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 |
| NL1026919C2 (en) * | 2004-08-27 | 2006-02-28 | Nedap Agri B V | Ultra-wide-band system for determining animals. |
| WO2009099965A2 (en) | 2008-02-05 | 2009-08-13 | Saint-Gobain Performance Plastics Corporation | Multi-layer article |
| RU2483930C2 (en) | 2008-11-12 | 2013-06-10 | Сэнт-Гобэн Перформанс Пластикс Корпорейшн | Barrier structure and method of making said structure |
| 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 | |
| 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 |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE392582B (en) * | 1970-05-21 | 1977-04-04 | Gore & Ass | PROCEDURE FOR THE PREPARATION OF A POROST MATERIAL, BY EXPANDING AND STRETCHING A TETRAFLUORETENE POLYMER PREPARED IN AN PASTE-FORMING EXTENSION PROCEDURE |
| 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 |
| DE3410501C2 (en) * | 1984-03-22 | 1990-09-13 | Dornier System Gmbh, 7990 Friedrichshafen | Radome material |
| DE3410503A1 (en) * | 1984-03-22 | 1986-01-02 | Dornier System Gmbh, 7990 Friedrichshafen | METHOD FOR PRODUCING RADOMAS |
| 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 DE DE8888306093T patent/DE3878777T2/en not_active Expired - Fee Related
- 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 ES ES198888306093T patent/ES2038293T3/en not_active Expired - Lifetime
- 1988-07-04 AT AT88306093T patent/ATE86411T1/en not_active IP Right Cessation
- 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 DK DK438988A patent/DK438988A/en not_active Application Discontinuation
- 1988-08-05 CA CA000573921A patent/CA1310573C/en not_active Expired - Fee Related
- 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
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100564026C (en) * | 2001-10-29 | 2009-12-02 | 戈尔企业控股股份有限公司 | architectural fabric |
| 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 |
| CN106715785A (en) * | 2014-09-16 | 2017-05-24 | 帝斯曼知识产权资产管理有限公司 | Space frame radome comprising a polymeric sheet |
| US10450697B2 (en) | 2014-09-16 | 2019-10-22 | Dsm Ip Assets B.V. | Space frame radome comprising a polymeric sheet |
| CN110808465A (en) * | 2019-09-27 | 2020-02-18 | 浙江瑞堂塑料科技股份有限公司 | High-wave-transmittance radome and preparation process thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| FI883578A (en) | 1989-02-07 |
| JPH08181522A (en) | 1996-07-12 |
| FI90928C (en) | 1994-04-11 |
| JPH01114101A (en) | 1989-05-02 |
| KR890004466A (en) | 1989-04-22 |
| AU1750888A (en) | 1989-02-09 |
| JP2642958B2 (en) | 1997-08-20 |
| FI883578A0 (en) | 1988-07-29 |
| IE62504B1 (en) | 1995-02-08 |
| PT88153A (en) | 1989-06-30 |
| EP0302596B1 (en) | 1993-03-03 |
| JP2662381B2 (en) | 1997-10-08 |
| GB2207814A (en) | 1989-02-08 |
| ES2038293T3 (en) | 1993-07-16 |
| NO883421L (en) | 1989-02-07 |
| CA1310573C (en) | 1992-11-24 |
| AU603900B2 (en) | 1990-11-29 |
| EP0302596A1 (en) | 1989-02-08 |
| IE882367L (en) | 1989-02-06 |
| NO173962C (en) | 1994-02-23 |
| IS1500B (en) | 1992-07-30 |
| GB8815837D0 (en) | 1988-08-10 |
| IS3379A7 (en) | 1989-02-07 |
| ATE86411T1 (en) | 1993-03-15 |
| DE3878777T2 (en) | 1993-06-09 |
| DK438988D0 (en) | 1988-08-05 |
| DE3878777D1 (en) | 1993-04-08 |
| FI90928B (en) | 1993-12-31 |
| CN1015414B (en) | 1992-02-05 |
| NO173962B (en) | 1993-11-15 |
| NO883421D0 (en) | 1988-08-02 |
| DK438988A (en) | 1989-02-07 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C13 | Decision | ||
| GR02 | Examined patent application | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C15 | Extension of patent right duration from 15 to 20 years for appl. with date before 31.12.1992 and still valid on 11.12.2001 (patent law change 1993) | ||
| OR01 | Other related matters | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |