US3201296A - Method of making a waveguide window - Google Patents
Method of making a waveguide window Download PDFInfo
- Publication number
- US3201296A US3201296A US26338963A US3201296A US 3201296 A US3201296 A US 3201296A US 26338963 A US26338963 A US 26338963A US 3201296 A US3201296 A US 3201296A
- Authority
- US
- United States
- Prior art keywords
- window
- waveguide
- film
- adhesive
- section
- 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 - Lifetime
Links
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/08—Dielectric windows
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
- Y10T156/12—Surface bonding means and/or assembly means with cutting, punching, piercing, severing or tearing
- Y10T156/1304—Means making hole or aperture in part to be laminated
- Y10T156/1309—Means making hole or aperture in part to be laminated and securing separate part over hole or aperture
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/31504—Composite [nonstructural laminate]
- Y10T428/31511—Of epoxy ether
- Y10T428/31515—As intermediate layer
- Y10T428/31522—Next to metal
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/31504—Composite [nonstructural laminate]
- Y10T428/3154—Of fluorinated addition polymer from unsaturated monomers
- Y10T428/31544—Addition polymer is perhalogenated
Definitions
- This invention relates to waveguides and more particularly to a method of constructing a polytetrafiuoroethylene waveguide window.
- a sealed or pressure-resistant window is generally mounted across a section of waveguide and must be essentially transparent to microwave energy over desired frequency and temperature ranges.
- One of the objects of this invention is to provide a method of making an inexpensive waveguide window which is essentially transparent to microwave energy, which is capable of operating at high temperatures, and which is able to withstand severe shock and vibration.
- Another object of the instant invention is to provide a method for bonding a Waveguide window of polytetrafluoroethylene across a waveguide section.
- a further object of this invention is to provide a method which utilizes an improved non-corrosive and high tensile strength adhesive and a film of polytetrafluoroethylene for making a waveguide window.
- Still a further object of the present invention is to provide a method of manufacturing a waveguide window employing a technique for bonding a film of polytetrafiuoroethylene to a metalilc waveguide section which results in an economical, airtight waveguide construction having a very low voltage standing wave ratio (VSWR).
- VSWR voltage standing wave ratio
- a polytetrafiuoroethylene film is treated in a sodium-naphthalene bath to render it cementable and is then bonded to aluminum or brass waveguide flanges with a high-temporature-resistant adhesive containing epoxy resin and solvent.
- the film so bonded provides a waveguide window.
- Windows so assembled have successfully withstood pressures of about 20 p.s.i.g. at a temperature of 125 C. (257 F.) for 15 minutes and have provided a voltage standing wave ratio (VSWR) no greater than 1.08 when measured within a particular test-frequency band.
- VSWR voltage standing wave ratio
- FIGURE 1 shows the waveguide windows of this invention prior to assembly.
- FIGURE 2 shows the assembled waveguide window.
- waveguide section 10 is provided with the conventional flange 11 and a rectangular recess 12 formed in flange 11.
- the waveguide section 10 has the usual rectangular bore 10a extending longitudinally therethrough which is used to guide the microwave signals.
- the rectangular polytetralluoroethylene window 13 is cemented by means of an'epoxy adhesive 14 in recess 12.
- Rectangular insert 15 is insertable in recess 12 and is cemented to the edges of window 13 by epoxy-solvent adhesive 14.
- Flange 11 and insert 15 are preferably composed of brass or aluminum.
- Polytetrafiuoroethylene window 13 can be between 0.0050.010 inch in thickness and should be devoid of pinholes. Windows having a thickness of 0.005 inch are preferred. Before window 13 is ready for bonding in recess 12 it is immersed for 15 minutes in a bath containing a one molar complex of sodium-naphthalene in tetrahydrofuran. The window is removed from the bath, rinsed first with acetone and then with water and gently wiped dry with a soft tissue. It is then ready to receive the epoxy adhesive 14 compounded from the following ingredients:
- Epoxy resin (viscosity 5-9 poises) 25 Chlorendic anhydride 25 Acetone 30 Methyl ethyl ketone 20
- An epoxy resin which has been found to be very satisfactory is Epon 815.
- Epon 815 is a reaction product of epichlorohydrin and bisphenol-A, with ten percent of butyl glycidyl ether diluent.
- Epon 815 has a viscosity of between 6-9 poises and an epoxy equivalent of approximately 175.
- Adhesive 14- is of sufiiciently low viscosity to allow extremely thin layers, less than 0.0005 inch in thickness, to be painted on the window 13. Because of the water-like consistency of the adhesive layer it has no significant effect on the electrical behavior of the window. Therefore, when the entire window is painted with adhesive it is not necessary to mask the transmission area of the window.
- this thin layer provides a strong high-temperature bond for bonding the window 13 to the recess 12 as well for bonding the brass or aluminum insert 15 to the brass or aluminum flange 11.
- a thin layer of adhesive 14 of approximately 0.0005 inch in thickness is painted over the entire side 13:: of window 13.
- Window 13 consists of a rectangular film of polytetrafluoroethylene 0.005 inch in thickness.
- Window 13 is dropped in place in the brass or aluminum recess 12, adhesive side facing rectangular bore 10a.
- Additional adhesive 14 is applied to the edges of the aluminum or brass insert 15 and to the face of the insert 15 which is to be pressed against side 13!: of window 13.
- insert 15 will bond to side 1312 of window 13 and to recess 12.
- the window and insert which are coated with adhesive 14 can be dried at room temperature for 15 minutes and then at 65 degrees centigrade in a forceddraft oven for one hour. The parts will then be dry to touch and can be stored for many days prior to the assembly and final cure.
- a cured assembly such as the one described above will confine an air pressure of 20 psig. in rectangular bore a when the section 10 is heated to a temperature of 125 degrees Centigrade for minutes.
- waveguide windows composed of polytetrafiuoroethylene and constructed as described have advantages not attainable by known windows.
- an epoxysolvent adhesive is disclosed which has an extremely low viscosity and which is resistant to high temperatures resulting from heat developed by the flight of the missile in which the waveguides are incorporated.
- a method of making a window for a metallic waveguide structure comprising the steps of:
- said epoxy resin consists essentially of a reaction product of epichlorohydrin and bisphenol-A, with ten percent of butyl ether diluent,
- said curing agent is chlorendic anhydride
- said solvents are acetone and methyl ethyl ketone.
- a window for said waveguide section comprising the steps of:
- said epoxy resin is a reaction product of epichlorohydrin and bisphenol-A with ten percent of butyl glycidyl ether diluent
- said curing agent is chlorendic anhydride
- said solvents are acetone and methyl ethyl ketone.
- said thin film of polytetrafluoroethylene is approximately 0.005 inch in thickness
- said thin layer of adhesive covering said one entire side of said film is approximately 0.0005 inch in thickness.
Landscapes
- Lining Or Joining Of Plastics Or The Like (AREA)
- Laminated Bodies (AREA)
Description
T. J. KILDUFF ETAL METHOD OF MAKING A WAVEGUIDE WINDOW Original Filed April 9, 1959 Aug. 17, 1965 l/ I) Q G lfb L3 /5 INVENTORS ATTORNEYS United States Patent 3,201,296 METHGD OF MAKING A WAVEGUED'E WINDQW Timothy J. Kildulf, Mount Rainier, and Asaf A. Benderly, Potomac, Md assignors to the United States of America as represented by the Secretary of the Army Original application Apr. 9, 1959, Ser. No. 805,350, new Patent No. 3,095,550, dated June 25, 1963. Divided and this application Mar. 5, 1963, Ser. No. 263,359 7 Claims. (Cl. 156-108) (Granted under Title 35, US. Code (1952), see. 266) The invention described herein may be manufactured and used by or for the Government for governmental purposes without the payment to us of any royalty thereon.
This application is a division of application Serial No. 805,350, filed on April 9, 1959, now Patent No. 3,095,550 for Polytetrafiuoroethylene Waveguide Window Construction.
This invention relates to waveguides and more particularly to a method of constructing a polytetrafiuoroethylene waveguide window.
In a variety of applications it is necessary to close or seal a microwave system to retain air pressure within it and to prevent the entry of water, water vapor, dust or other extraneous matter. A sealed or pressure-resistant window is generally mounted across a section of waveguide and must be essentially transparent to microwave energy over desired frequency and temperature ranges.
Commercial waveguide pressure-resistant windows are currently constructed of electrical grade glass fused to a metal frame, or of mica sealed to a metal frame with a low-melting glass or solder. Apart from their substantial cost, these windows present the difficult problem of soldering or attachment to aluminum or brass Waveguides, and also offer some risk of corrosion due to the proximity of dissimilar metals.
One of the objects of this invention, therefore, is to provide a method of making an inexpensive waveguide window which is essentially transparent to microwave energy, which is capable of operating at high temperatures, and which is able to withstand severe shock and vibration.
Another object of the instant invention is to provide a method for bonding a Waveguide window of polytetrafluoroethylene across a waveguide section.
A further object of this invention is to provide a method which utilizes an improved non-corrosive and high tensile strength adhesive and a film of polytetrafluoroethylene for making a waveguide window.
Still a further object of the present invention is to provide a method of manufacturing a waveguide window employing a technique for bonding a film of polytetrafiuoroethylene to a metalilc waveguide section which results in an economical, airtight waveguide construction having a very low voltage standing wave ratio (VSWR).
According to this invention, a polytetrafiuoroethylene film is treated in a sodium-naphthalene bath to render it cementable and is then bonded to aluminum or brass waveguide flanges with a high-temporature-resistant adhesive containing epoxy resin and solvent. The film so bonded provides a waveguide window. Windows so assembled have successfully withstood pressures of about 20 p.s.i.g. at a temperature of 125 C. (257 F.) for 15 minutes and have provided a voltage standing wave ratio (VSWR) no greater than 1.08 when measured within a particular test-frequency band.
The specific nature of the invention, as well as other objects, uses and advantages thereof, will clearly appear from the following description and from the accompanying drawing, in which:
FIGURE 1 shows the waveguide windows of this invention prior to assembly.
3,201,295 Patented Aug. 1?, 1565 FIGURE 2 shows the assembled waveguide window.
As shown in FIGURE 1, waveguide section 10 is provided with the conventional flange 11 and a rectangular recess 12 formed in flange 11. The waveguide section 10 has the usual rectangular bore 10a extending longitudinally therethrough which is used to guide the microwave signals. The rectangular polytetralluoroethylene window 13 is cemented by means of an'epoxy adhesive 14 in recess 12. Rectangular insert 15 is insertable in recess 12 and is cemented to the edges of window 13 by epoxy-solvent adhesive 14. Flange 11 and insert 15 are preferably composed of brass or aluminum.
Constituent: Parts by weight Epoxy resin (viscosity 5-9 poises) 25 Chlorendic anhydride 25 Acetone 30 Methyl ethyl ketone 20 An epoxy resin which has been found to be very satisfactory is Epon 815. Epon 815 is a reaction product of epichlorohydrin and bisphenol-A, with ten percent of butyl glycidyl ether diluent. Epon 815 has a viscosity of between 6-9 poises and an epoxy equivalent of approximately 175.
Adhesive 14- is of sufiiciently low viscosity to allow extremely thin layers, less than 0.0005 inch in thickness, to be painted on the window 13. Because of the water-like consistency of the adhesive layer it has no significant effect on the electrical behavior of the window. Therefore, when the entire window is painted with adhesive it is not necessary to mask the transmission area of the window.
In addition, this thin layer provides a strong high-temperature bond for bonding the window 13 to the recess 12 as well for bonding the brass or aluminum insert 15 to the brass or aluminum flange 11.
. In assembling a typical waveguide window in accordance with this invention, a thin layer of adhesive 14 of approximately 0.0005 inch in thickness is painted over the entire side 13:: of window 13. Window 13 consists of a rectangular film of polytetrafluoroethylene 0.005 inch in thickness. Window 13 is dropped in place in the brass or aluminum recess 12, adhesive side facing rectangular bore 10a. Additional adhesive 14 is applied to the edges of the aluminum or brass insert 15 and to the face of the insert 15 which is to be pressed against side 13!: of window 13. Thus insert 15 will bond to side 1312 of window 13 and to recess 12.
If desired, the window and insert which are coated with adhesive 14 can be dried at room temperature for 15 minutes and then at 65 degrees centigrade in a forceddraft oven for one hour. The parts will then be dry to touch and can be stored for many days prior to the assembly and final cure.
After the window 13 is placed in recess: 12 and insert 15 placed against the face 131: of the window, 15 to 20 psi. pressure is applied to the insert 15 by a spring or other suitable means which can be devised by those skilled in the art. Curing of the adhesive 14 under pressure of 15 to 20 psi. is elfected at a temperature of degrees centigrade in a forced-draft oven for 3 hours.
A cured assembly such as the one described above will confine an air pressure of 20 psig. in rectangular bore a when the section 10 is heated to a temperature of 125 degrees Centigrade for minutes. The insertion of the 0.005 inch-thick polytetrafiuoroethylene window across the rectangular bore 10:: does not increase the voltage standing wave ratio (VSWR) beyond 1.08 when measured within a band consisting of 200 megacycles on either side of a particular microwave frequency. Tests indicate that the VSWR varies insignificantly between frequencies of 8,000 and 10,000 megacycles. The value of 1.08 can be compared with values of VSWR in excess of 1.10 which are typical of the substantially more expensive commercial glass or mica windows.
In light of the foregoing it will be evident to those in the art that waveguide windows composed of polytetrafiuoroethylene and constructed as described have advantages not attainable by known windows. In addition, an epoxysolvent adhesive is disclosed which has an extremely low viscosity and which is resistant to high temperatures resulting from heat developed by the flight of the missile in which the waveguides are incorporated.
It will be apparent that the embodiments shown are only exemplary and that various modifications can be made in construction and arrangement within the scope of the invention as defined in the appended claims.
We claim as our invention:
1. A method of making a window for a metallic waveguide structure comprising the steps of:
(a) chemically treating the surface of a thin film of polytetrafluoroethylene to obtain a cementable film,
(b) coating said treated surface over its entire area with a thin-layer of a low viscosity epoxy adhesive,
(c) placing said adhesively coated surface of said film against an open end of a section of said waveguide thereby closing said open section, and
(d) curing said adhesive under heat and pressure to provide an effective seal between said waveguide section and said polytetrafiuoroethylene film.
2. The method of making a waveguide window according to claim 1 wherein,
(a) the surface of said polytetrafiuoroethylene film is chemically treated with a solution containing a one molar complex of sodium-naphthalene in tetrahydrofuran to obtain a cementable film, and
(b) said treated surface being coated over its entire area with a thin layer of a low viscosity adhesive comprising an epoxy resin, a curing agent and a mixture of solvents.
3. The method according to claim 2 wherein,
(a) said epoxy resin consists essentially of a reaction product of epichlorohydrin and bisphenol-A, with ten percent of butyl ether diluent,
(b) said curing agent is chlorendic anhydride, and
(c) said solvents are acetone and methyl ethyl ketone.
4. In the fabrication of a waveguide assembly having a metallic waveguide section with a bore therethrough substantially coaxial to the longitudinal axis of said section, a flange formed on one end of said section, a recess formed in said flange, and a metallic insert for said recess having a bore therethrough to match said bore in said section, the method of constructing a window for said waveguide section comprising the steps of:
(a) chemically treating the surface of a thin film of polytetrafiuoroethylene to obtain a cementable film,
(b) applying a thin layer of a low viscosity epoxy adhesive composition to the entire treated surface of one side of said film covering said side completely,
(0) placing said film in said recess with said side of said film having said adhesive thereon facing said bore,
(d) coating the exterior edges and one face of said insert with said adhesive,
(e) positioning said insert in said recess with said adhesively coated face adjacent the other side of said film, and then (f) curing said adhesive under pressure at an elevated temperature,
(g) whereby after curing, said film provides a sealed window for said section that is essentially transparent to microwave energy.
5. The method according to claim 4 further comprising the steps of:
(a) treating said surfaces of said film by immersing said film in a bath containing a one molar complex of sodium-naphthalene in tetrahydrofuran thereby obtaining a cementable film, and
(b) applying a thin layer of a low viscosity adhesive composition consisting essentially of an epoxy resin, a curing agent and a mixture of solvents to the treated surface of one side of said film covering the entire side thereof.
6. The method as recited in claim 5 wherein,
(a) said epoxy resin is a reaction product of epichlorohydrin and bisphenol-A with ten percent of butyl glycidyl ether diluent,
(b) said curing agent is chlorendic anhydride, and
(c) said solvents are acetone and methyl ethyl ketone.
7. The method according to claim 6 wherein,
(a) said thin film of polytetrafluoroethylene is approximately 0.005 inch in thickness, and
(b) said thin layer of adhesive covering said one entire side of said film is approximately 0.0005 inch in thickness.
References Cited by the Examiner UNITED STATES PATENTS 2,527,765 10/50 Roehrl. 2,637,776 5/53 Edson 333-98 2,809,130 10/57 Rappaport 156-315 X 2,871,144 l/59 Doban 117138.8 2,882,502 4/59 Freundlich 333-98 2,932,806 4/60 Burr 174110 FOREIGN PATENTS 209,032 6/57 Australia.
EARL M. BERGERT, Primary Examiner.
Claims (1)
1. A METHOD OF MAKING A WINDOW FOR A METALLIC WAVEGUIDE STRUCTURE COMPRISING THE STEPS OF (A) CHEMICALLY TREATING THE SURFACE OF A THIN FILM OF POLYTETRAFLUOROETHYLENE TO OBTAIN A CEMENTABLE FILM, (B) COATING SAID TREATING SURFACE OVER ITS ENTIRE AREA WITH A THIN-LAYER OF A LOW VISCOSITY EPOXY ADHESIVE, (C) PLACING SAID ADHESIVELY COATED SURFACE OF SAID FILM AGAINST AN OPEN END OF A SECTION OF SAID WAVEGUIDE THEREBY CLOSING SAID OPEN SECTION, AND (D) CURING SAID ADHESIVE UNDER HEAT AND PRESSURE TO PROVIDE AN EFFECTIVE SEAL BETWEEN SAID WAVEGUIDE-SECTION AND SAID POLYTETRAFLUOROETHYLENE FILM.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US26338963 US3201296A (en) | 1959-04-09 | 1963-03-05 | Method of making a waveguide window |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US805350A US3095550A (en) | 1959-04-09 | 1959-04-09 | Polytetrafluoroethylene waveguide window construction |
US26338963 US3201296A (en) | 1959-04-09 | 1963-03-05 | Method of making a waveguide window |
Publications (1)
Publication Number | Publication Date |
---|---|
US3201296A true US3201296A (en) | 1965-08-17 |
Family
ID=26949820
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US26338963 Expired - Lifetime US3201296A (en) | 1959-04-09 | 1963-03-05 | Method of making a waveguide window |
Country Status (1)
Country | Link |
---|---|
US (1) | US3201296A (en) |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3275870A (en) * | 1962-01-09 | 1966-09-27 | Westinghouse Electric Corp | Ceramic type electroluminescent device with moisture penetration prevention seal |
US3539430A (en) * | 1968-01-24 | 1970-11-10 | Us Army | Method of constructing a radio-frequency feed-through assembly |
US3733694A (en) * | 1970-07-02 | 1973-05-22 | Hollandse Signaalapp Nv | Procedure for sealing waveguide nozzles |
EP0457625A2 (en) * | 1990-05-18 | 1991-11-21 | Inax Corporation | Dustproofing film for waveguide and method for production thereof |
DE4217900A1 (en) * | 1992-05-29 | 1993-12-02 | Leybold Ag | Arrangement of microwave-transparent pane in hollow waveguide - the pane being glued to part attached to the vacuum chamber |
US20070023029A1 (en) * | 2005-07-27 | 2007-02-01 | Maytag Corp. | Door assembly for a cooking appliance |
GB2458663A (en) * | 2008-03-26 | 2009-09-30 | Thales Holdings Uk Plc | Radome for a radar pressurised horn antenna |
US11362404B2 (en) | 2020-10-30 | 2022-06-14 | Applied Materials, Inc. | Microwave window including first and second plates with vertical stepped areas configured for pressure sealing a dielectric plate between the first and second plates |
USD967081S1 (en) * | 2020-10-30 | 2022-10-18 | Applied Materials, Inc. | Microwave transmission window assembly |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2527765A (en) * | 1944-11-01 | 1950-10-31 | Gen Aniline & Film Corp | Film mount |
US2637776A (en) * | 1948-04-20 | 1953-05-05 | Bell Telephone Labor Inc | Sealed wave guide window |
US2809130A (en) * | 1956-05-18 | 1957-10-08 | Gen Motors Corp | Method of bonding a fluorinated synthetic resin to another material |
US2871144A (en) * | 1957-04-03 | 1959-01-27 | Du Pont | Method for the preparation of cementable fluorocarbon polymer surfaces |
US2882502A (en) * | 1954-04-19 | 1959-04-14 | Cutler Hammer Inc | Waveguide window |
US2932806A (en) * | 1958-12-02 | 1960-04-12 | Bomac Lab Inc | Broadband microwave window |
-
1963
- 1963-03-05 US US26338963 patent/US3201296A/en not_active Expired - Lifetime
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2527765A (en) * | 1944-11-01 | 1950-10-31 | Gen Aniline & Film Corp | Film mount |
US2637776A (en) * | 1948-04-20 | 1953-05-05 | Bell Telephone Labor Inc | Sealed wave guide window |
US2882502A (en) * | 1954-04-19 | 1959-04-14 | Cutler Hammer Inc | Waveguide window |
US2809130A (en) * | 1956-05-18 | 1957-10-08 | Gen Motors Corp | Method of bonding a fluorinated synthetic resin to another material |
US2871144A (en) * | 1957-04-03 | 1959-01-27 | Du Pont | Method for the preparation of cementable fluorocarbon polymer surfaces |
US2932806A (en) * | 1958-12-02 | 1960-04-12 | Bomac Lab Inc | Broadband microwave window |
Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3275870A (en) * | 1962-01-09 | 1966-09-27 | Westinghouse Electric Corp | Ceramic type electroluminescent device with moisture penetration prevention seal |
US3539430A (en) * | 1968-01-24 | 1970-11-10 | Us Army | Method of constructing a radio-frequency feed-through assembly |
US3733694A (en) * | 1970-07-02 | 1973-05-22 | Hollandse Signaalapp Nv | Procedure for sealing waveguide nozzles |
EP0457625A2 (en) * | 1990-05-18 | 1991-11-21 | Inax Corporation | Dustproofing film for waveguide and method for production thereof |
EP0457625A3 (en) * | 1990-05-18 | 1992-08-12 | Inax Corporation | Dustproofing film for waveguide and method for production thereof |
DE4217900A1 (en) * | 1992-05-29 | 1993-12-02 | Leybold Ag | Arrangement of microwave-transparent pane in hollow waveguide - the pane being glued to part attached to the vacuum chamber |
US20070023029A1 (en) * | 2005-07-27 | 2007-02-01 | Maytag Corp. | Door assembly for a cooking appliance |
US8578925B2 (en) * | 2005-07-27 | 2013-11-12 | Whirlpool Corporation | Oven door assembly incorporating overlay member |
GB2458663A (en) * | 2008-03-26 | 2009-09-30 | Thales Holdings Uk Plc | Radome for a radar pressurised horn antenna |
GB2458663B (en) * | 2008-03-26 | 2012-11-21 | Thales Holdings Uk Plc | Radome |
US11362404B2 (en) | 2020-10-30 | 2022-06-14 | Applied Materials, Inc. | Microwave window including first and second plates with vertical stepped areas configured for pressure sealing a dielectric plate between the first and second plates |
USD967081S1 (en) * | 2020-10-30 | 2022-10-18 | Applied Materials, Inc. | Microwave transmission window assembly |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US3201296A (en) | Method of making a waveguide window | |
US4785955A (en) | Vacuum container for heat-vacuum test chamber | |
US3700538A (en) | Polyimide resin-fiberglass cloth laminates for printed circuit boards | |
US3616122A (en) | Laminated window panels | |
US4849048A (en) | Method of sealing electric and electronic parts | |
CN101981753B (en) | Co-firing of magnetic and dielectric materials for fabricating composite assemblies for circulators and isolators | |
US3095550A (en) | Polytetrafluoroethylene waveguide window construction | |
US3296802A (en) | Laminated material and arrangement thereof for use in pressure vessels | |
US4157273A (en) | Bonding with a poly(arylene sulfide)-polytetrafluoroethylene adhesive | |
JPS6349403B2 (en) | ||
EP0243162B1 (en) | Multi-layered microwave absorber and method of manufacturing the same | |
CA2188344A1 (en) | Plateable structural adhesive for cyanate ester composites | |
US3103887A (en) | Pre-stressed glass fiber attachment ring | |
US2683678A (en) | Glass mounting | |
US3414445A (en) | Method for producing window panels | |
US2584133A (en) | Insert fastener | |
RU2709033C1 (en) | Radiotransparent radome of aircraft onboard antenna system | |
US3198877A (en) | Pothead closure sealed with bismuth-tin alloy | |
CA1273087A (en) | Multi-layered microwave absorber and method of manufacturing the same | |
US5853149A (en) | Stress-free dome mount missile design | |
US3479204A (en) | Epoxide resin seals | |
US3723214A (en) | Method of making a steel,graphite,phenolic asbestos laminate | |
US1695830A (en) | Joint and connection | |
US3405029A (en) | Bonding transducers to delay lines | |
JPS58166303A (en) | Production of optical fiber penetration type hermetic terminal board |