WO1994001899A1 - Chassis d'etancheite et membrane protectrice pour antenne de radar parabolique et a cornet - Google Patents

Chassis d'etancheite et membrane protectrice pour antenne de radar parabolique et a cornet Download PDF

Info

Publication number
WO1994001899A1
WO1994001899A1 PCT/US1992/007115 US9207115W WO9401899A1 WO 1994001899 A1 WO1994001899 A1 WO 1994001899A1 US 9207115 W US9207115 W US 9207115W WO 9401899 A1 WO9401899 A1 WO 9401899A1
Authority
WO
WIPO (PCT)
Prior art keywords
closure
snap ring
ring body
slot
female snap
Prior art date
Application number
PCT/US1992/007115
Other languages
English (en)
Inventor
John H. Lutz
Richard Giannetta
Original Assignee
W. L. Gore & Associates, Inc.
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by W. L. Gore & Associates, Inc. filed Critical W. L. Gore & Associates, Inc.
Publication of WO1994001899A1 publication Critical patent/WO1994001899A1/fr

Links

Classifications

    • 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

Definitions

  • the invention relates to radar horns and dishes
  • radio antennas often need a covering structure to protect them from the weather and damage from sunlight, wind, or moisture.
  • the invention comprises a sealing frame for a radar transmitter/receiver comprising a female snap ring body configured to have an indented molded slot of smaller diameter than that of the ring body and a lip portion forming an outer edge of larger diameter than the slot, a male compression ring of about the same diameter and matching configuration to the slot of the female snap ring body, and a sheet of moisture and weather-resistant laminate covering the female snap ring body and being clamped into place and held thereon between the female snap ring slot and the male compression ring to form a leak-proof seal.
  • the sheet of moisture and weather-resistant laminate is a material essentially transparent to radar and microwave frequencies and a preferred laminate comprises that of U.S. Patent No. 4,946,736 issued August 7, 1990 (assigned to W. L. Gore & Associates, Inc.), which comprises two layers of porous expanded polytetrafluoroethylene (ePTFE) sandwiched around a thermoplastic adhesive polymer layer and a woven fiberous backing fabric comprising porous ePTFE.
  • ePTFE porous expanded polytetrafluoroethylene
  • the female snap ring body may be formed as an outer edge of a radar dish or horn or may comprise a separate ring attachable to the dish or horn.
  • the material of the rings is of a weather durable material selected from a plastic such as polycarbonate, polypropylene, polyester, polyamide, or weather-resistant fluorocarbon, such as fluorinated ethylene-propylene copolymer (FEP), perfluoro alkoxy tetrafluoroethylene (PFA), or polytetrafluoroethylene (PTFE), for example.
  • a plastic such as polycarbonate, polypropylene, polyester, polyamide, or weather-resistant fluorocarbon, such as fluorinated ethylene-propylene copolymer (FEP), perfluoro alkoxy tetrafluoroethylene (PFA), or polytetrafluoroethylene (PTFE), for example.
  • FEP fluorinated ethylene-propylene copolymer
  • PFA perfluoro alkoxy te
  • Figure 1 is a partial cross-sectional view of the snap ring portions of a closure of the invention with the female snap ring body molded into the edge of a horn or dish.
  • Figure 2 is a partial cross-sectional view of an alternate form of a closure of the invention in which snap ring parts are separate from a horn or dish and snap onto an edge thereof.
  • Figure 3 is a cross-sectional view of a preferred laminate for embodiment in the invention.
  • Figure 4 is a perspective view of a horn covered with a laminate held to its edge by a snap ring closure of the invention.
  • Figure 5 is a cross-sectional view of a radar dish covered with a laminate installed across the opening of the dish by the closure of the invention.
  • Figure 1 describes in a cross-sectional view a closure of the invention including a female snap ring body ⁇ which is shown molded into the distal edge of a radar collector horn or dish as an integral part thereof.
  • An indented molded slot 3 and a lip 1 form a part of body 1.
  • Slot 3 has a diameter less than that of body ⁇ to match in size and shape approximately the inner diameter and width of male compression rin" 5, which can be forced under pressure to slide over lip 6 and snap into place in slot 3_.
  • Male compression ring 5 has a protruding lip 4 which fits into corresponding slot 2 cut or molded into body i to effect a more moisture and weatherproof seal of body 1. with male compression ring 5_ when a moisture and weather-resistant laminate is held between body I and ring 5.
  • Body 1 and ring 5 may be either molded, such as injection molded, or cut (machined) from polymers having a coefficient of thermal expansion matching that of the horn or dish.
  • Suitable polymers may include, for example, polycarbonate, polypropylene, polyester, polyamide, and weather-resistant fluoropolymers, such as FEP, PFA, and PTFE. Others may be used which have a requisite formability.
  • Figure 2 shows in a cross-sectional view an alternative form of the invention in which the female snap ring body 8 is se ⁇ ate from the edge i of a radar horn, collector horn, or dish.
  • body 8 has a proximal lip ⁇ and a slot which snaps over a bead or lip formed on edge ⁇ to hold body 8 on edge 1 . Additional protection of the joint against moisture or weather is provided by an elastomer "0"-ring 9 fitted into a holding groove on body 8.
  • Laminate 7 always has layer 2i of Figure 3 facing outwardly from the body of the dish or horn.
  • Figure 3 shows a cross-section of a preferred laminate 20 most useful in this invention because of its excellent moisture, gas, and weatherproof properties.
  • Layers of porous ePTFE 2. and 2 are sandwiched around and held together by a thermoplastic polymer adhesive layer 22.
  • a woven ePTFE fiber backing layer 24 provides strength to the laminate.
  • Preferred laminate 20 is described in U.S. Patent No. 4,946,736, which is hereby incorporated by reference.
  • a range of useful materials and methods for making laminate 0 are fully described therein. Other materials may be used for the laminate if they are suitably moisture and weatherproof and relatively transparent to radiation frequencies useful in microwave signal transmissions.
  • FIG 4 shows in a perspective view a radar horn or collector horn 34.
  • a closure 3J. of the invention is affixed on the edge thereof to hold across the opening of the horn laminate 30 to provide protection from moisture, weather, insects, or birds, and the like.
  • Depicted in ghost lines or broken lines is the microwave receiver 32 and horn 34 is mounted on housing 33 which may be attached to a building or tower.
  • Horn 34 may be hollow or filled with a microwave-transmitting plastic or other material.
  • Figure 5 shows in a partial cross-sectional view a radar or microwave dish 42 which is mounted on a support structure 15 by a connecting support 44.
  • Dish 42 has a collecting horn 43.
  • a sealing frame snap ring 4J. body and compression ring are mounted or formed on the outer edge of dish 42.
  • Sealing frame 4_1 holds a laminate 40 across the opening of the dish 42, the ePTFE side 2 ⁇ always facing outwardly.
  • the sealing frame of the invention is advantageous for protection of a radar dish or horn from the elements of weather, insects, or birds in that its parts can be made small, of low contour, and its membrane is virtually transparent to microwave radiation frequencies useful for signal communication and provides weather protection along with excellent signal transmission and reception.
  • sealing frame snap rings would hold in place a membrane having a surface of polytetrafluoroethylene, which is well known as having a low coefficient of friction, and form a leak-proof seal.

Landscapes

  • Details Of Aerials (AREA)

Abstract

Châssis d'étanchéité résistant à l'humidité et aux intempéries pour antenne de radar parabolique et à cornet qui comporte une fermeture circulaire par encliquetage permettant d'emboîter une membrane transparente de radar sur l'ouverture de l'antenne parabolique ou à cornet. Une membrane sous forme de feuille de polytétrafluoréthylène expansé poreuse est préférée.
PCT/US1992/007115 1992-07-02 1992-08-21 Chassis d'etancheite et membrane protectrice pour antenne de radar parabolique et a cornet WO1994001899A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US90787992A 1992-07-02 1992-07-02
US907,879 1992-07-02

Publications (1)

Publication Number Publication Date
WO1994001899A1 true WO1994001899A1 (fr) 1994-01-20

Family

ID=25424795

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1992/007115 WO1994001899A1 (fr) 1992-07-02 1992-08-21 Chassis d'etancheite et membrane protectrice pour antenne de radar parabolique et a cornet

Country Status (1)

Country Link
WO (1) WO1994001899A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996022774A2 (fr) * 1995-01-26 1996-08-01 Ashbury Research Corporation Association medicamenteuse comprenant une sesquiterpene lactone et des vitamines du complexe b, destinee au traitement de la migraine et d'autres troubles
GB2383690A (en) * 2001-12-26 2003-07-02 Sharp Kk Capped feed-horn structure and a method for its manufacture
EP3849014A1 (fr) * 2020-01-08 2021-07-14 Ingenieria Prosix S.L. Mécanisme de fermeture étanche du radome

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3243823A1 (de) * 1982-11-26 1984-05-30 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Schnappverbindung zwischen koerpern
EP0302596A1 (fr) * 1987-08-06 1989-02-08 W.L. Gore & Associates, Inc. Structure lamellaire transparent aux rayonnements électromagnétiques
EP0322498A2 (fr) * 1987-12-02 1989-07-05 Masprodenkoh Kabushikikaisha Source primaire pour antenne parabolique
US4918459A (en) * 1989-02-27 1990-04-17 Teso John S De Apparatus for protecting antennas

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3243823A1 (de) * 1982-11-26 1984-05-30 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Schnappverbindung zwischen koerpern
EP0302596A1 (fr) * 1987-08-06 1989-02-08 W.L. Gore & Associates, Inc. Structure lamellaire transparent aux rayonnements électromagnétiques
EP0322498A2 (fr) * 1987-12-02 1989-07-05 Masprodenkoh Kabushikikaisha Source primaire pour antenne parabolique
US4918459A (en) * 1989-02-27 1990-04-17 Teso John S De Apparatus for protecting antennas

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 6, no. 238 (E-144)(1116) 26 November 1982 *

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996022774A2 (fr) * 1995-01-26 1996-08-01 Ashbury Research Corporation Association medicamenteuse comprenant une sesquiterpene lactone et des vitamines du complexe b, destinee au traitement de la migraine et d'autres troubles
WO1996022774A3 (fr) * 1995-01-26 1996-09-26 Ashbury Research Corp Association medicamenteuse comprenant une sesquiterpene lactone et des vitamines du complexe b, destinee au traitement de la migraine et d'autres troubles
GB2383690A (en) * 2001-12-26 2003-07-02 Sharp Kk Capped feed-horn structure and a method for its manufacture
GB2383690B (en) * 2001-12-26 2005-10-05 Sharp Kk Feed horn structure and manufacturing method thereof,converter,and satellite communication receiving antenna
US7064727B2 (en) 2001-12-26 2006-06-20 Sharp Kabushiki Kaisha Feed horn structure and manufacturing method thereof, converter, and satellite communication receiving antenna
US7154446B2 (en) 2001-12-26 2006-12-26 Sharp Kabushiki Kaisha Feed horn structure and manufacturing method thereof, converter, and satellite communication receiving antenna
EP3849014A1 (fr) * 2020-01-08 2021-07-14 Ingenieria Prosix S.L. Mécanisme de fermeture étanche du radome

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