EP0583557B1 - Window glazing - Google Patents

Window glazing Download PDF

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Publication number
EP0583557B1
EP0583557B1 EP19930108076 EP93108076A EP0583557B1 EP 0583557 B1 EP0583557 B1 EP 0583557B1 EP 19930108076 EP19930108076 EP 19930108076 EP 93108076 A EP93108076 A EP 93108076A EP 0583557 B1 EP0583557 B1 EP 0583557B1
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EP
European Patent Office
Prior art keywords
glazing unit
wire
window glazing
unit according
layer
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
Application number
EP19930108076
Other languages
German (de)
French (fr)
Other versions
EP0583557A1 (en
Inventor
Andreas Dr. Frye
Heimfried Dr. Gerke
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Airbus Defence and Space GmbH
Original Assignee
Daimler Benz Aerospace AG
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
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Publication of EP0583557A1 publication Critical patent/EP0583557A1/en
Application granted granted Critical
Publication of EP0583557B1 publication Critical patent/EP0583557B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q17/00—Devices for absorbing waves radiated from an antenna; Combinations of such devices with active antenna elements or systems
    • E—FIXED CONSTRUCTIONS
    • E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06B—FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES
    • E06B3/00—Window sashes, door leaves, or like elements for closing wall or like openings; Layout of fixed or moving closures, e.g. windows in wall or like openings; Features of rigidly-mounted outer frames relating to the mounting of wing frames
    • E06B3/66—Units comprising two or more parallel glass or like panes permanently secured together
    • E06B3/67—Units comprising two or more parallel glass or like panes permanently secured together characterised by additional arrangements or devices for heat or sound insulation or for controlled passage of light
    • E06B3/6715—Units comprising two or more parallel glass or like panes permanently secured together characterised by additional arrangements or devices for heat or sound insulation or for controlled passage of light specially adapted for increased thermal insulation or for controlled passage of light
    • E—FIXED CONSTRUCTIONS
    • E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06B—FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES
    • E06B5/00—Doors, windows, or like closures for special purposes; Border constructions therefor
    • E06B5/10—Doors, windows, or like closures for special purposes; Border constructions therefor for protection against air-raid or other war-like action; for other protective purposes
    • E06B5/18—Doors, windows, or like closures for special purposes; Border constructions therefor for protection against air-raid or other war-like action; for other protective purposes against harmful radiation
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
    • H01Q15/14—Reflecting surfaces; Equivalent structures
    • H01Q15/22—Reflecting surfaces; Equivalent structures functioning also as polarisation filter

Definitions

  • the invention relates to window glazing, consisting of double glazing with a sealed intermediate space, in which a translucent layer (3) with a defined surface resistance is arranged in the area of the outer pane and in which the inner pane is provided with a radar-reflecting, optically transparent layer (6).
  • Such window glazing has already been described in DE 40 08 660 A1. It is constructed according to the principle of the Jaumann absorber, i.e. the portion of the incident electromagnetic radiation reflected in the area of the outer pane becomes the portion of the radiation that is superimposed on the inner pane by the reflection layer arranged at a distance of about a quarter of the operating wavelength, due to the extinction of both parts takes place.
  • the glazing described has proven itself in use, but in the production of such glazing there is the problem that the known layers vapor-deposited on the outer pane cannot be produced with the required precision and reproducibility.
  • the dimensions of the glazing for an operating frequency of approximately 1 GHz result in the following advantageous dimensions: the thickness of the outer pane 2 is 6 to 18 mm, that of the inner pane 7 is approximately 4 to 12 mm.
  • the width of the interspace 5 is selected in the range 16 to 35 mm.
  • the distance between two adjacent wires 3 is approximately 10 to 30 mm.
  • the wire diameter can be freely selected within a wide range. In the exemplary embodiment, wire diameters of less than 0.5 mm were chosen in order not to significantly restrict the optical transparency.
  • the dimensioning of the distance d between the parallel wires and their angle ⁇ to the direction of polarization of the incident electromagnetic radiation R significantly influence the intensity of the reflection suppression.
  • the window glazing according to the invention uses the principle of operation of the known Jaumann absorber, the necessary amplitudes and phases of the respective portions of the electromagnetic radiation are matched by means of the distance between the wire-shaped electrical conductors 3 and the distance between the wires 3 and the radar reflecting layer 6 on the inner pane 7.
  • the layer 6 on the inner pane 7 is designed as a heat protection layer.
  • metallic reflection can be assumed.
  • the purpose of the invention is now to set the reflection factor r 1 of the layer 3 of the outer pane to a certain value with easily realizable and reproducible means.
  • the surface resistance of the layer 3 consisting of the parallel wires is about 300 ⁇ / ⁇ , about 38% of the incident electromagnetic radiation being reflected.
  • the reflection factor r 1 generated by the parallel wires 3 is strongly dependent on the direction of polarization of the incident electromagnetic radiation. For this reason, the wires are arranged approximately in the region around 45 ° to the direction of polarization. The position of the wires within the window glazing is easily adaptable to the requirements in the manufacturing process. The adjustment to the conditions at the installation site can also be carried out by setting the optimum angle of rotation to the predominant direction of polarization.
  • the parallel wires act in a similar way to a known vapor-deposited resistance layer and moreover have a defined and adjustable surface resistance.
  • the distance d between the wires affects the equivalent sheet resistance of the window glazing. If the distance is less than 1 cm at an operating wavelength of 1 GHz, the surface resistance is too small. With a large wire spacing (d> 3 cm), the arrangement no longer appears homogeneous, since the wires begin to act as discrete radiation elements, as a result of which the suppression of reflection deteriorates increasingly.
  • the wire diameter is advantageously chosen to be very small. For reasons of optical transparency, a was used in the exemplary embodiment Diameter selected less than 0.5 mm.
  • the arrangement of the wires according to the invention does not act in the specified dimensioning like an arrangement of flatly distributed discrete radiation elements, which because of their frequency selectivity act narrow-band, but the entirety of the wires acts as a homogeneous layer with a precisely defined surface conductivity and also has the advantage of high optical transparency .

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  • Engineering & Computer Science (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Surface Treatment Of Glass (AREA)
  • Aerials With Secondary Devices (AREA)
  • Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
  • Joining Of Glass To Other Materials (AREA)

Description

Die Erfindung betrifft eine Fensterverglasung, bestehend aus einer Doppelverglasung mit abgedichtetem Zwischenraum, bei der im Bereich der Außenscheibe eine lichtdurchlässige Schicht (3) mit definiertem Oberflächenwiderstand angeordnet ist und bei der die Innenscheibe mit einer radarreflektierenden, optisch transparenten Schicht (6) versehen ist.The invention relates to window glazing, consisting of double glazing with a sealed intermediate space, in which a translucent layer (3) with a defined surface resistance is arranged in the area of the outer pane and in which the inner pane is provided with a radar-reflecting, optically transparent layer (6).

Eine derartige Fensterverglasung ist bereits in der DE 40 08 660 A1 beschrieben. Sie ist nach dem Prinzip des Jaumann-Absorbers aufgebaut, d.h., der im Bereich der Außenscheibe reflektierte Anteil der einfallenden elektromagnetischen Strahlung wird derjenigen Anteil der Strahlung, der von der im Abstand von etwa einem Viertel der Betriebswellenlänge angeordneten Reflexionsschicht auf der Innenscheibe überlagert, wobei aufgrund der Gegenphasigkeit beider Anteile eine Auslöschung stattfindet. Die beschriebene Verglasung hat sich in der Anwendung bewährt, bei der Herstellung derartiger Verglasungen ergibt sich aber das Problem, daß die bekannten auf die Außenscheibe aufgedampften Schichten nicht mit der geforderten Präzision und Reproduzierbarkeit herstellbar sind.Such window glazing has already been described in DE 40 08 660 A1. It is constructed according to the principle of the Jaumann absorber, i.e. the portion of the incident electromagnetic radiation reflected in the area of the outer pane becomes the portion of the radiation that is superimposed on the inner pane by the reflection layer arranged at a distance of about a quarter of the operating wavelength, due to the extinction of both parts takes place. The glazing described has proven itself in use, but in the production of such glazing there is the problem that the known layers vapor-deposited on the outer pane cannot be produced with the required precision and reproducibility.

Es ist deshalb Aufgabe der Erfindung, eine Bauweise für radarabsorbierende Verglasungen anzugeben, die leicht herstellbar ist und die vor allem eine Anpassung der elektrischen Eigenschaften an die am Einbauort gegebenen Verhältnisse erlaubt.It is therefore an object of the invention to provide a construction for radar-absorbing glazing which is easy to manufacture and which, above all, allows the electrical properties to be adapted to the conditions prevailing at the installation site.

Diese Aufgabe wird in überraschend einfacher Weise dadurch gelöst, daß im Bereich der Außenscheibe eine Anordnung von parallelen drahtförmigen elektrischen Leitern vorgesehen ist, die in einem Winkel α zur Polarisationsrichtung der einfallenden elektromagnetischen Strahlung ausgerichtet ist und die so viel der einfallenden Strahlung reflektiert wie von der transmittierten Strahlung nach Reflexion an der Schicht der Innenscheibe wieder durch sie in Gegenrichtung zur einfallenden Strahlung hindurchtritt. Weitere vorteilhafte Ausgestaltungsformen sind in den Unteransprüchen beschrieben.This object is achieved in a surprisingly simple manner in that an arrangement of parallel wire-shaped electrical conductors is provided in the area of the outer pane, which is oriented at an angle α to the direction of polarization of the incident electromagnetic radiation and which reflects as much of the incident radiation as of the transmitted one Radiation after reflection at the layer of the inner pane passes through it again in the opposite direction to the incident radiation. Further advantageous embodiments are described in the subclaims.

Die besonderen Vorteile der erfindungsgemäßen Bauweise der Verglasung liegen einmal in der vereinfachten Herstellbarkeit und zum anderen in der Einstellbarkeit des zur Erfüllung der Interferenzbedingungen erforderlichen Reflexionsfaktors.The particular advantages of the construction of the glazing according to the invention lie firstly in the simplified manufacture and secondly in the adjustability of the reflection factor required to meet the interference conditions.

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung vereinfacht dargestellt und im folgenden näher beschrieben.An embodiment of the invention is shown in simplified form in the drawing and described in more detail below.

Die einzige Figur der Zeichnung zeigt einen Schnitt durch eine Isolierverglasung für Gebäude mit zwei voneinander getrennten Scheiben 2 und 7. Dazwischen befindet sich ein evakuierter oder gasgefüllter Zwischenraum 5. In der Außenscheibe 2, die auch als zusammengefügte Doppelscheibe ausgeführt sein kann, sind parallel verlaufende Drähte 3 angeordnet.The only figure in the drawing shows a section through an insulating glazing for buildings with two separate panes 2 and 7. In between there is an evacuated or gas-filled intermediate space 5. In the outer pane 2, which can also be designed as an assembled double pane, are parallel wires 3 arranged.

Bei einer Dimensionierung der Verglasung für eine Betriebsfrequenz von etwa 1 GHz ergeben sich folgende vorteilhafte Bemaßungen: Die Dicke der Außenscheibe 2 beträgt 6 bis 18 mm, die der Innenscheibe 7 etwa 4 bis 12 mm. Die Weite des Zwischenraumes 5 wird im Bereich 16 bis 35 mm gewählt. Der Abstand zweier benachbarter Drähte 3 beträgt etwa 10 bis 30 mm. Der Drahtdurchmesser ist in einem weiten Rahmen beliebig wählbar. Im Ausführungsbeispiel wurden Drahtdurchmesser kleiner als 0,5 mm gewählt, um die optische Transparenz nicht wesentlich einzuschränken.The dimensions of the glazing for an operating frequency of approximately 1 GHz result in the following advantageous dimensions: the thickness of the outer pane 2 is 6 to 18 mm, that of the inner pane 7 is approximately 4 to 12 mm. The width of the interspace 5 is selected in the range 16 to 35 mm. The distance between two adjacent wires 3 is approximately 10 to 30 mm. The wire diameter can be freely selected within a wide range. In the exemplary embodiment, wire diameters of less than 0.5 mm were chosen in order not to significantly restrict the optical transparency.

Die Dimensionierung des Abstandes d der parallel verlaufenden Drähte und deren Winkel α zur Polarisationsrichtung der einfallenden elektromagnetischen Strahlung R beeinflussen wesentlich die Intensität der Reflexionsunterdrückung. Unter der Voraussetzung, daß die erfindungsgemäße Fensterverglasung das Funktionsprinzip des bekannten Jaumannabsorbers benutzt, erfolgt die dazu erforderliche Abstimmung der Amplituden und Phasen der jeweiligen Anteile der elektromagnetischen Strahlung mittels des Abstandes der drahtförmigen elektrischen Leiter 3 untereinander und mittels des Abstandes der Drähte 3 zur radarreflektierenden Schicht 6 an der Innenscheibe 7.The dimensioning of the distance d between the parallel wires and their angle α to the direction of polarization of the incident electromagnetic radiation R significantly influence the intensity of the reflection suppression. Provided that the window glazing according to the invention uses the principle of operation of the known Jaumann absorber, the necessary amplitudes and phases of the respective portions of the electromagnetic radiation are matched by means of the distance between the wire-shaped electrical conductors 3 and the distance between the wires 3 and the radar reflecting layer 6 on the inner pane 7.

Es ist beim Ausführungsbeispiel davon auszugehen, daß die Schicht 6 an der Innenscheibe 7 als Wärmeschutzschicht ausgeführt ist. Demzufolge kann von einer metallischen Reflexion ausgegangen werden. Zweck der Erfindung ist es nun, mit einfach realisierbaren und reproduzierbaren Mitteln den Reflexionsfaktor r1 der Schicht 3 der Außenscheibe auf einen bestimmten Wert einzustellen. Bei der vorgegebenen Dimensionierung ergibt sich für die aus den parallelen Drähten bestehende Schicht 3 ein Oberflächenwiderstand von etwa 300 Ω/□, wobei ca. 38% der einfallenden elektromagnetischen Strahlung reflektiert werden. Somit sind unter der Voraussetzung, daß die Schichten 3 und 6 etwa ein Viertel der Betriebswellenlänge voneinander beabstandet sind, die Bedingungen für einen Jaumannabsorber erfüllt, da etwa 38% der ursprünglich einfallenden Strahlung wieder in Gegenrichtung zur einfallenden Strahlung austreten. Der durch die parallelen Drähte 3 erzeugte Reflexionsfaktor r1 ist stark abhängig von der Polarisationsrichtung der einfallenden elektromagnetischen Strahlung. Aus diesem Grund sind die Drähte etwa im Bereich um 45° zur Polarisationsrichtung angeordnet. Die Lage der Drähte innerhalb der Fensterverglasung ist beim Herstellungsproezß leicht an die Anforderungen anpassbar. Ebensogut kann die Anpassung an die am Einbauort vorhandenen Verhältnisse erfolgen, in dem der optimale Drehwinkel zur vorherrschenden Polarisationsrichtung eingestellt wird. Die parallel verlaufenden Drähte wirken dabei ähnlich wie eine bekannte aufgedampfte Widerstandsschicht und weisen darüberhinaus einen definierten und einstellbaren Oberflächenwiderstand auf.In the exemplary embodiment it can be assumed that the layer 6 on the inner pane 7 is designed as a heat protection layer. As a result, metallic reflection can be assumed. The purpose of the invention is now to set the reflection factor r 1 of the layer 3 of the outer pane to a certain value with easily realizable and reproducible means. With the given dimensioning, the surface resistance of the layer 3 consisting of the parallel wires is about 300 Ω / □ , about 38% of the incident electromagnetic radiation being reflected. Thus, provided that layers 3 and 6 are spaced about a quarter of the operating wavelength apart, the conditions for a Jaumann absorber are met, since about 38% of the originally incident radiation emerges again in the opposite direction to the incident radiation. The reflection factor r 1 generated by the parallel wires 3 is strongly dependent on the direction of polarization of the incident electromagnetic radiation. For this reason, the wires are arranged approximately in the region around 45 ° to the direction of polarization. The position of the wires within the window glazing is easily adaptable to the requirements in the manufacturing process. The adjustment to the conditions at the installation site can also be carried out by setting the optimum angle of rotation to the predominant direction of polarization. The parallel wires act in a similar way to a known vapor-deposited resistance layer and moreover have a defined and adjustable surface resistance.

Der Abstand d der Drähte untereinander beeinflußt den äquivalenten Flächenwiderstand der Fensterverglasung. Wird bei einer Betriebswellenlänge von 1 GHz der Abstand kleiner als 1 cm gewählt, ergibt sich ein zu kleiner Flächenwiderstand. Bei großem Drahtabstand (d > 3 cm) wirkt die Anordnung nicht mehr homogen, da die Drähte als diskrete Strahlungselemente zu wirken beginnen, wodurch sich die Reflexionsunterdrückung zunehmend verschlechtert.The distance d between the wires affects the equivalent sheet resistance of the window glazing. If the distance is less than 1 cm at an operating wavelength of 1 GHz, the surface resistance is too small. With a large wire spacing (d> 3 cm), the arrangement no longer appears homogeneous, since the wires begin to act as discrete radiation elements, as a result of which the suppression of reflection deteriorates increasingly.

Der Drahtdurchmesser wird vorteilhafterweise sehr klein gewählt. Aus Gründen der optischen Transparenz wurde beim Ausführungsbeispiel ein Durchmesser kleiner als 0,5 mm gewählt.The wire diameter is advantageously chosen to be very small. For reasons of optical transparency, a was used in the exemplary embodiment Diameter selected less than 0.5 mm.

Die erfindungsgemäße Anordnung der Drähte wirkt in der angegebenen Dimensionierung somit nicht wie eine Anordnung flächig verteilter diskreter Strahlungselemente, die aufgrund ihrer Frequenzselektivität schmalbandig wirken, sondern die Gesamtheit der Drähte wirkt als homogene Schicht mit genau definierter Oberflächenleitfähigkeit und besitzt zudem noch den Vorteil einer hohen optischen Transparenz.The arrangement of the wires according to the invention does not act in the specified dimensioning like an arrangement of flatly distributed discrete radiation elements, which because of their frequency selectivity act narrow-band, but the entirety of the wires acts as a homogeneous layer with a precisely defined surface conductivity and also has the advantage of high optical transparency .

Claims (7)

  1. A window glazing unit consisting of a double glazing unit having a sealed intermediate space, in which a light-transmitting layer (3) with a defined surface resistance is disposed in the region of the outer pane, and in which the inner pane is provided with a radar-reflecting, optically transparent layer (6),
    wherein the proportion of the radar radiation which is reflected by the radar-reflecting layer (6) and which has passed through the light-transmitting layer (3) again is approximately equal to the proportion of the radar radiation which is reflected by the light-transmitting layer (3), characterised in that the layer (3) situated in the region of the outer pane (2) consists of wire-shaped electrical conductors which are situated parallel to each other, the longitudinal axis of which is at an angle (α) to the direction of polarisation of the incident radar radiation.
  2. A window glazing unit according to claim 1, characterised in that the angle (α) is preferably set within the range of 35-55° to the direction of polarisation of the incident radar radiation.
  3. A window glazing unit according to claim 1, characterised in that the longitudinal axis of the wire-shaped electrical conductors (3) is preferably set in the region of the vertical.
  4. A window glazing unit according to any one of claims 1 to 3, characterised in that the spacing (d) of the wire-shaped electrical conductors is selected so that a surface resistance in the region of around 300 Ω/□ is obtained.
  5. A window glazing unit according to any one of claims 1 to 4, characterised in that the spacing of the wire-shaped conductors in relation to each other is selected within the range of 1/30 to 1/10 of the operating wavelength (λ).
  6. A window glazing unit according to any one of claims 1 to 5, characterised in that the diameter of the wire-shaped conductors is about 1/500 to 1/1000 of the operating wavelength (λ).
  7. A window glazing unit according to any one of the preceding claims, characterised in that the outer pane (2) consists of two panes joined together, between which the wire-shaped conductors (3) are disposed.
EP19930108076 1992-08-14 1993-05-18 Window glazing Expired - Lifetime EP0583557B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19924227032 DE4227032C1 (en) 1992-08-14 1992-08-14 Window glazing
DE4227032 1992-08-14

Publications (2)

Publication Number Publication Date
EP0583557A1 EP0583557A1 (en) 1994-02-23
EP0583557B1 true EP0583557B1 (en) 1996-12-11

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP19930108076 Expired - Lifetime EP0583557B1 (en) 1992-08-14 1993-05-18 Window glazing

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EP (1) EP0583557B1 (en)
DE (1) DE4227032C1 (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4340907C1 (en) * 1993-12-01 1995-01-19 Deutsche Aerospace Window glazing
JP3319147B2 (en) * 1994-04-15 2002-08-26 ティーディーケイ株式会社 Radio wave absorber
DE4416165C2 (en) * 1994-05-06 1998-10-15 Daimler Benz Aerospace Ag Radar-absorbing arrangement for window glazing or facade cladding
DE19838246C2 (en) * 1998-08-22 2001-01-04 Daimler Chrysler Ag Bispectral window for a reflector and reflector antenna with this bispectral window
DE19929081C2 (en) * 1999-03-26 2002-06-13 Daimler Chrysler Ag Radar-absorbing laminated glass
CN102409944A (en) * 2011-11-15 2012-04-11 深圳市广安消防装饰工程有限公司 Fireproof door with obvious guide effect
ES2710913T3 (en) * 2011-12-14 2019-04-29 Saint Gobain Deutsche Glas Gmbh Radar reflexion dampening glazing
CN103046849B (en) * 2012-12-31 2015-04-22 深圳市广安消防装饰工程有限公司 Fireproof door with emergency illumination function

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3663089A (en) * 1970-07-01 1972-05-16 Polaroid Corp High order wave plate correction of polariscopic effects in windows having infrared filtering
DE3608958A1 (en) * 1986-03-18 1987-09-24 Ge Elektronische Schutzsysteme Window for electromagnetically shielded rooms
EP0328952A1 (en) * 1988-02-15 1989-08-23 Siemens Aktiengesellschaft Electromagnetically shieldeed and thermally insulated window with a glass assembly and support member
DE8915902U1 (en) * 1989-06-06 1992-02-13 Messerschmitt-Boelkow-Blohm Gmbh, 8012 Ottobrunn, De
GB8918859D0 (en) * 1989-08-18 1989-09-27 Pilkington Plc Electromagnetic shielding panel
DE4008660A1 (en) * 1990-03-17 1991-09-19 Messerschmitt Boelkow Blohm Window glass system for high buildings - has double outer skin with layer of radar absorbing material and inner panel
DE4101074C2 (en) * 1991-01-16 1994-08-25 Flachglas Ag Glazing element with low reflectance for radar radiation

Also Published As

Publication number Publication date
EP0583557A1 (en) 1994-02-23
DE4227032C1 (en) 1993-09-30

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