Patent Description:
The demand of data traffic increases especially inside and outside buildings and vehicles, such as train, car,. In modern buildings, such as in modern vehicles, more and more glass is used and as thermal comfort is required, multiple glazing is commonly used.

Multiple glazing means a glazing unit with at least two glass panels combined together by a means of maintaining the two glass panels at a certain distance between the two glass panels. The glass panel placed outside of the building is called the outer glass panel where the other one is called the inner glass panel. To maintain the two glass panels at a certain distance one from the other, a spacer can be used in the periphery of the glazing unit with gas in the volume created between these two glass panels, pillars can be used between the two glass panels and a vacuum is created between these two glass panels, called vacuum insulated glazing (VIG). Usually, surfaces of glass panels have two main surfaces, one is oriented towards the outside of the building, vehicle,. while the other surface is oriented towards the inside of the building, vehicle,. These surfaces are named Sij where i and j are positive integers where i represents a reference to the glass panel itself and j represents the surface of this glass panel. The surface Sij with j number equals to one (S11, S21,. ) corresponds to the surface facing the outside of the building, vehicle,. The surface Sij with j number equals to two (S12, S22,. ) corresponds to the surface facing the inside of the building, vehicle,. In a multiple glazing comprising a first glass panel with S11 and S12 surfaces and a second glazing panel with surfaces S21 and S22, S12 and S21 are facing each other to create a volume between these two glass panels.

In other words, surfaces of a glazing unit can be summarized as from outside of the building : S11 / S12 / volume / S21 / S22 then the inside of the building.

In case of the glass panel has more than one glass sheet, inside surfaces are named Sij where j starts from <NUM> to the number of surfaces. When the glass panel has two glass sheets, the two surfaces inside the glass panel are named Si3 and Si4. In other words, surfaces of a glazing unit with the inner glass panel comprising two glass sheets can be summarized as from outside of the building : S11 / S13 / S14 / S12 / volume / S21 / S22 then the inside of the building.

In order to reduce the accumulation of heat in the interior of a building or vehicle, a glazing unit may be coated with a coating system, for example a solar control coating system, that absorbs or reflects solar energy. Inclusion of solar control films, particularly on glazing for use in warm, sunny climates, is desirable because they reduce the need for air conditioning or other temperature regulation methods. This affords savings in terms of energy consumption and environmental impact.

Such coating systems, however, are typically electrically conductive and are highly reflective for Radio Frequency (RF) waves and low in transmittance for RF waves. This effect impedes reception or transmission by antennas (or wireless devices).

To ensure the thermal comfort inside the building, a coating system such as a thermal comfort coating can be provided on at least one of the inner surfaces of the two glass panels meaning in S12 surface and/or S21 surface. In case of a glass panel with more than one glass sheet, coating system can be placed on at least one of all surfaces of the glass panel, Si1, Si2, Si3, Si4,.

This makes the coating systems effective broadband reflectors of radio frequency signals. Furthermore, commercial construction, automotive, train,. tend to use other materials that further block RF signals. Materials such as concrete, brick, mortar, steel, aluminum, roofing tar, gypsum wall board, and some types of wood all offer varying degrees of RF attenuation. The result is that many newer constructions severely impede RF signals from getting into or out of the buildings.

In some embodiments, where a glazing unit according to the invention has several coating systems between the housing and the outside of the building, vehicle,. , each coating system has to have a decoated zone at least in front of the housing.

Nonetheless, RF devices have become an important part of modern life, especially with the huge penetration of cellular smartphones, tablets, loT (Internet of Things) devices, that are requiring a deep penetration in buildings or automotive of electromagnetic field for indoor coverage, even at high spectrum frequency up to <NUM>. Such devices may include cellular transceivers, wireless local area network ("Wi-Fi") transceivers, Global Positioning System (GPS) receivers, Bluetooth transceivers and, in some cases, other RF receivers (e.g., FM/AM radio, UHF, etc.). As the popularity of such devices has grown, the importance of being able to use RF-based features within the confines of modern commercial buildings has grown.

In addition, in order to increase the speed and capacity of wireless communication, frequency bands to be used are becoming higher, like the frequency bands for the 5th generation mobile communication system (<NUM>). Therefore, even if a high-frequency electromagnetic wave having a broadband frequency band is used for a mobile communication, etc., it is necessary to have a wide band frequency selective surface in order to ensure the transmission of waves with different frequencies through the glazing unit.

The ITU IMT-<NUM> specification demands speeds up to <NUM> Gbps, achievable with wide channel bandwidths and massive MIMO 3rd Generation Partnership Project (3GPP) is going to submit <NUM> NR (New Radio) as its <NUM> communication standard proposal. <NUM> NR can include lower frequencies, below <NUM>, and mm-Wave, above <NUM>. On top of that, IoT will requires indoor coverage as good as possible not for massive MTC (Machine Type Communication) but for critical MTC where robots or industrial devices are <NUM> wireless remotely controlled.

Coating systems strongly attenuates EM signals when passing through glazing panels. And especially at mm-Wave, the signal level rapidly decreases due to high path loss. Many residential/commercial buildings therefore need outdoor, or outdoor-indoor repeaters and indoor CPEs. On top of that, an outdoor unit is typically undesirable for security reasons but also to provide easily power or to avoid environmental conditions that can damage the outdoor unit.

In case of the CPE and/or the repeater is placed inside the building, the signal is attenuated by at least <NUM> dB through glazing unit with a coated glass panel.

Some solutions provide a decoating portion on the coated glass panel. This decoated portion improves the signal inside the building but creates a narrow field of view. Especially at mm-Wave frequencies, beamforming is important to improve the signal to interference ratio (SIR) also because obstacles cause greater diffusion of the signal and less specular reflection meaning that there is higher propagation losses in NLOS. These solutions, to provide a greater field of view, need a greater decoated portion meaning loosing thermal performances of the glazing unit.

An object of one embodiment of the present invention is to provide a glazing unit capable of increasing the field of view from the indoor unit, capable to have a wide field of view and keeping higher chance to provide LOS link compared to existing solutions when beamforming for the transmission of waves with lower frequencies, below <NUM>, and mm-Wave, above <NUM> through the glazing unit. Document <CIT> discloses a window member comprising a frame body, wherein the frame comprises a housing for a radio wave transmitting/receiving unit.

It is an object of the present invention to alleviate these problems and especially the outdoor to indoor and/or the indoor to outdoor penetration, and to provide a glazing unit capable of increasing the field of view from the indoor unit, capable to have a wide field of view and keeping higher chance to provide LOS link compared to existing solutions for the transmission of waves with lower frequencies, below <NUM>, and mm-Wave frequency, above <NUM> through the glazing unit and shall be intended as an improvement. The present invention also provides a solution to improve the scanning range of beamforming, meaning a wider field of view, and a longer range of use.

According to a first aspect of the invention, the invention relates to an improved glazing unit extending along a plane, P, defined by a longitudinal axis, X, and a vertical axis, Z; having a width, DW, measured along the longitudinal axis, X, and a length, DL, measured along the vertical axis, Z, comprising, at least a first outer glass panel (<NUM>) having a S11 surface and a S12 surface and a second inner glass panel (<NUM>) having a S21 surface and a S22 surface combined together by at least a means (<NUM>) of maintaining the two glass panels at a certain distance between the surface S12 of the first outer glass panel and the surface S21 of the second inner glass sheet.

At higher frequencies the two glass panels can be low or high in transmittance for RF waves depending on the polarization of the signal, the angle of incidence and the frequency. High in transmittance for RF radiation means that RF radiation are mostly transmitted through the material where low in transmittance for RF radiation means that RF radiation are mostly reflected on the surface of the material and/or absorbed by the material and the attenuation is at level of <NUM> decibels (dB) or more. High in transmittance means an attenuation at level of <NUM> decibels (dB) or less. The coating system which is low in transmittance for RF radiation means that the coating system is blocking RF radiation to pass through the glazing.

The glazing unit also comprises a housing able to accommodate a <NUM> and/or <NUM> communication device having at least one antenna.

The glazing unit further comprises an opening arranged on the second inner glass panel.

Alternatively, the glazing unit comprises a <NUM> and/or <NUM> signal communication device and preferably, the communication device is inserted into the housing, more preferably the communication device is fixed inside the housing. In some embodiments according to the invention, the communication device is a mm-Wave signal communication device.

Alternatively, the housing comprises side parts and a cover and in some embodiments, he housing can comprise a bottom surrounded by side parts. The bottom can be a plain or with at least one hole in order to optimize the communication. This bottom can have a flat or free center part to avoid signal issues. Borders of the bottom can be curved to fulfil with other parts of the housing. The cover and/or sides of the housing can have parts interacting with respectively sides or the cover.

According to the invention, the housing can be made in a single piece meaning that sides, cover and the bottom if exists are a single piece. In some others embodiments, the housing can be made in separate pieces, all pieces can be assembled together with fixed or detachable means, such as glue, encapsulation, soldering, welding, screw, hooks,.

Alternatively, the housing is fixed on the S12 surface of the first outer glass panel through the said opening. The housing can be fixed to the glazing unit via sides, bottom, if exists or both.

In some embodiments, the housing has at least one attaching means for attaching the cover to the side parts, preferably detachable attaching means to open the housing for maintenance.

Alternatively , the housing can be placed in the opening without fixation mean. In some embodiments, the glazing unit is placed in a frame to be assembled in a building. The frame can be over a part of the housing as over glass panels. The frame can secured the housing in the opening.

The first outer glass panel has a S11 surface and a S12 surface and the second inner glass panel has a S21 surface and a S22 surface. The S11 surface is the surface facing the outside of the building or the vehicle, meaning that this surface S11 is oriented towards the outdoor of the building, vehicle,. , the S22 surface is facing the inside of the building or the vehicle, meaning that this surface S22 is oriented towards the indoor of the building, vehicle,. , when the glazing unit comprises two glass panels. S12 and S21 surfaces are together facing the inside of the glass unit, meaning that these surfaces are facing the created volume. The surface S12 is facing the inside of the building or the vehicle, meaning that this surface S12 is oriented towards the indoor of the building, vehicle,. , and the surface S21 is facing the outside of the building or the vehicle, meaning that this surface S21 is oriented towards the outdoor of the building, vehicle,.

The solution as defined in the first aspect of the present invention is based on the housing which is fixed at least on the first outer glass panel through the said opening.

In some embodiments according to the invention, a coating system which is low in transmittance for RF radiation can be disposed on at least a surface S21 or S22 of the second inner glass panel and/or a surface S11 or S12 of the first outer glass panel with at least a decoated zone on the said coating system in front of the said housing. In case of at least one glass panel has more than one glass sheet and then more than two surfaces, coating system can be placed on Si1, Si2, Si3, Si4,. The decoated zone means a zone of the coating system where the coating system is removed or has been masked during his application. In the decoated zone, the coating system is totally or partially absent or a plurality of small slits or any shape in the coating system to become a frequency selective surface in order to let waves pass from one side to the other side of the glass panel to further suppress deterioration of radio wave transmission performances. The decoated zone can be limited to a zone in front of the said housing meaning that the decoated zone is placed vis-à-vis of the zone where the housing is fixed on. In some embodiment, the decoated zone can be limited to the antenna aperture of the communication device accommodated inside the said housing.

According to one embodiment of the invention, the opening is arranged in the area of a corner of the second inner glass panel and preferably in the lower part of the second inner glass panel. Indeed, in the area of the opening of the second inner glass panel, the spacer may follow the shape of the opening in order to correctly insure the adhesion of the first and the second glass panel to the spacer. In case of VIG, the sealing material able to keep the vacuum may follow the shape of the opening in order to correctly insure the tightness and the vacuum.

As the glazing unit is placed in a building or in a vehicle, the glazing unit is placed vertically or with an angle from the vertical axis (Z-axis) in a way that the glazing unit has a upper part and a lower part. The upper part is the part with higher z-values and the lower part is the part of the glazing unit with lower z-values.

Preferably, when the opening is arranged in the area of a corner of the second inner glass sheet, the opening is a cut-out and the shape of the cut-out is triangular or an arc or a polygon. Preferably, the shape of the cut-out is triangular in order to minimize the cost and the handling of glass panels assembly.

In some embodiments according of the invention, the opening is arranged in a side of the second inner glass sheet and preferably in the lower part of the second inner glass sheet. Preferably, the opening is a cut-out and the shape of the cut-out is a rectangular or an arc or a polygon, Preferably, the shape of the cut-out is rectangular in order to minimize the cost and the handling of glass panels assembly and preferably one side of the side rectangular has substantially the same size that the side of the second inner glass sheet. The spacer disposed between the at least first and second glass sheets and extends along the periphery of the glass sheets has a rectangular shape or may follow the same shape as the inner glass sheet with the cut-out. Indeed, in the area of the cut-out of the inner glass, the spacer may follow the shape of the cutout in order to correctly insure the adhesion of the first and the second glass sheet to the spacer. In case of VIG, the sealing material able to keep the vacuum may follow the shape of the opening in order to correctly insure the tightness and the vacuum.

According to the invention, the housing comprises a heatsink able to dissipate the heat generated by the communication device. Preferably the said heatsink is placed on the cover facing the outside of the said housing then facing the inside of the building to optimize the heat dissipation while reducing the noise.

According to the present invention, the opening can be surrounded by the second inner glass panel meaning that the housing is surrounded also by the second inner glass panel.

The present invention relates also to a communication system comprising at least a glazing unit as described and a provider fixed station or active or passive repeater, which is placed at least at <NUM> outside from the glazing unit.

The present invention relates also to a communication system comprising at least a glazing unit as described to provide indoor and/or outdoor coverage as a fixed access point.

It is noted that the invention relates to all possible combinations of features recited in the claims or in the described embodiments.

The following description relates to a building window unit but it's understood that the invention may be applicable to others fields like automotive or transportation windows which have to be attached such as train.

For a better understanding, the scale of each member in the drawing may be different from the actual scale. In the present specification, a three-dimensional orthogonal coordinate system in three axial directions (X axis direction, Y axis direction, Z axis direction) is used, the width direction of the glazing unit is defined as the X direction, the thickness direction is defined as the Y direction, and the length is defined as the Z direction. The direction from the bottom to the top of the glazing unit is defined as the + Z axis direction, and the opposite direction is defined as the - Z axis direction. In the following description, the + Z axis direction is referred to as upward and the - Z axial direction may be referred to as down following arrows.

With reference to <FIG>, an embodiment of the present invention is described.

As shown in <FIG>, a glazing unit <NUM> extending along a plane, P, defined by a longitudinal axis, X, and a vertical axis, Z; having a width, DW, measured along the longitudinal axis, X, and a length, DL, measured along the vertical axis, Z, comprising at least a first outer glass panel <NUM> and a second inner glass panel <NUM> combined together by a means <NUM> of maintaining the two glass panels at a certain distance between the two glass panels.

In this embodiment, the means is a spacer <NUM> and the spacer separates the first outer glass panel from the second inner glass panel to create a space filled by a gas like Argon to improve the thermal isolation of the glazing unit, creating an insulating glazing unit. In the area of the opening <NUM> of the second inner glass pane <NUM>, the spacer <NUM> may follow the shape of the cutout in order to correctly insure the adhesion of the first and the second glass sheet to the spacer. The spacer is then placed in the border of the second glass panel allowing the tightness of the volume <NUM> of the glazing unit to keep the gas in this volume <NUM>.

The glazing unit comprises also a housing <NUM> able to accommodate a <NUM> and/or <NUM> wavelengths communication device. The housing is placed in one lower corner of the glazing unit meaning that X-values and Z-values are the lowest and dimensions of the borders in P plane are Dh1, Dh2, Dh3.

The glazing unit also comprises an opening <NUM> which is arranged on the second inner glass panel <NUM> to allow the housing <NUM> to be fixed on the first outer glass panel <NUM>. In this embodiment, the opening is a cut-out and the shape of the cut-out is triangular. Dimensions of the opening in P plane are slightly similar to those of the housing to allow the housing to the be placed in the said opening while to avoid the space between the housing and the opening and therefore to minimize the movement.

In some embodiment, regarding <FIG> the opening may have another shape than a triangle, for example a part of circle (an arc), a square, a polygon, a rectangle,.

In some embodiments, at least one of the two glass panels comprises two glass sheets laminated together by at least one interlayer to reduce the noise and/or to ensure the penetration safety. The laminated glazing comprises glass panels maintained by one or more interlayers positioned between glass panels. It means that between the housing and the outside of the building, vehicle,. it is possible to have more than one glass sheets. The interlayers employed are typically polyvinyl butyral (PVB) or ethylene-vinyl acetate (EVA) for which the stiffness can be tuned. These interlayers keep the glass panels bonded together even when broken in such a way that they prevent the glass from breaking up into large sharp pieces.

In some embodiments, at least one of the two glass panels comprises two glass sheets combined together by at least a means of maintaining the two glass panels at a certain distance. It means that between the housing and the outside of the building, vehicle,. It is possible to have more than one glass sheets.

The housing can be fixed by a double-sided tape, a glue or any suitable fixing means able to fix the housing on the surface of a glass pane. The housing can be fixed on the surface S12 or at least one side of the housing on the spacer. The housing can also be fixed on the surface S22.

The first outer glass pane <NUM> has a S11 surface and a S12 surface. S11 surface is facing the outside of the building and S12 surface is facing the volume <NUM> created between the two glass panes <NUM>, <NUM>.

The second inner glass pane <NUM> has a S21 surface and a S22 surface. S22 surface is facing the inside of the building and S21 surface is facing the volume <NUM> created between the two glass panes. S12 surface and S21 surface are facing together and are separated by a distance slightly corresponding to the thickness of the spacer <NUM> and materials allowing to fix the spacer to the glass panes. Then, the weather strip may press on S11 and S22 surfaces.

Alternatively, the materials used to fix the spacer to the glass panels are UV resistant to avoid deterioration of the said materials. Especially, the adhesive between the spacer and the glass panels can be a silicone based material.

In some embodiments, the first outer <NUM> and/or the second inner <NUM> glass panels are at least transparent for visible waves, meaning with a light transmission of at least <NUM>, in order to see-through and to let light passing through.

In some embodiments, the first outer <NUM> and/or the second inner <NUM> glass panels comprise at least two glass sheets separated by a spacer or laminated together.

The first outer <NUM> and/or the second inner <NUM> glass panels can be manufactured by a known manufacturing method such as a float method, a fusion method, a redraw method, a press molding method, or a pulling method. As a manufacturing method of the glass panel <NUM>, from the viewpoint of productivity and cost, it is preferable to use the float method.

The first outer <NUM> and/or the second inner <NUM> glass panels can be flat or curved according to requirements by known methods such as hot or cold bending.

The first outer <NUM> and/or the second inner <NUM> glass panels can be processed, i.e. annealed, thermally tempered, chemically tempered. to respect with the specifications of security and anti-thief requirements. Especially, the first outer glass panel can be thermally or chemically tempered to avoid breakage in case of overheat near the housing.

The first outer <NUM> and/or the second inner <NUM> glass panels can be a clear glass or a coloured glass, tinted with a specific composition of the glass or by applying an additional coating or a plastic layer for example.

In some embodiments, each glass panel can be independently processed and/or coloured,. in order to improve the aesthetic, thermal insulation performances, safety,.

The thickness, measured in Y-axis, of the first outer <NUM> and/or the second inner <NUM> glass panels is set according to requirements of applications.

The first outer <NUM> and/or the second inner <NUM> glass panels can be formed in a rectangular shape in a plan view by using a known cutting method. As a method of cutting the first outer <NUM> and/or the second inner <NUM> glass panels, for example, a method in which laser light is irradiated on the surface of the first outer <NUM> and/or the second inner <NUM> glass panels to cut the irradiated region of the laser light on the surface of the first outer <NUM> and/or the second inner <NUM> glass panels to cut the glass panels, or a method in which a cutter wheel is mechanically cutting can be used. The glass panels can have any shape in order to fit with the application, for example a windshield, a sidelite, a sunroof of an automotive, a lateral glazing of a train, a window of a building,.

Some plastics elements can be fixed on the glazing unit to ensure the tightness to gas and/or liquid, to ensure the fixation of the glazing panel or to add external element to the glazing panel.

High in transmittance for RF signal, that also be a low in reflectance for RF radiation, means that RF radiation are mostly transmitted through the material whereas low in transmittance for RF signal, can also be a high in reflectance for RF radiation means that RF radiation are mostly reflected on the surface of the material and/or absorbed by the material and the attenuation is at level of <NUM> decibels (dB) or more. High in transmittance means an attenuation at level of <NUM> decibels (dB) or less. The coating system which is low in transmittance, can mean high in reflectance, for RF radiation means that the coating system is non-transmitting to RF radiation.

In some preferred embodiments, a coating system which is high in reflectance for RF radiation can be disposed on at least said S21 surface of the second inner glass panel and/or said S12 surface of the first outer glass panel with at least a decoated zone in front of the said housing. In embodiments with more than two glass sheets, the coating system can be disposed on other surfaces.

According to the invention, the coating system can be a functional coating in order to heat the surface of the glazing panel, to reduce the accumulation of heat in the interior of a building or vehicle or to keep the heat inside during cold periods for example. Although coating system are thin and mainly transparent to eyes.

The coating system can be made of layers of different materials and at least one of this layer is electrically conductive. The coating system is electrically conductive over the majority of one major surface of the glazing panel.

The coating system of the present invention has an emissivity of not more than <NUM>, preferably less than <NUM>, in particular less than <NUM>, less than <NUM> or even less than <NUM>. The coating system of the present invention may comprise a metal based low emissive coating system; these coatings typically are a system of thin layers comprising one or more, for example two, three or four, functional layers based on an infrared radiation reflecting material and at least two dielectric coatings, wherein each functional layer is surrounded by dielectric coatings. The coating system of the present invention may in particular have an emissivity of at least <NUM>. The functional layers are generally layers of silver with a thickness of some nanometers, mostly about <NUM> to <NUM>. Concerning the dielectric layers, they are transparent and traditionally each dielectric layer is made from one or more layers of metal oxides and/or nitrides. These different layers are deposited, for example, by means of vacuum deposition techniques such as magnetic field-assisted cathodic sputtering, more commonly referred to as "magnetron sputtering". In addition to the dielectric layers, each functional layer may be protected by barrier layers or improved by deposition on a wetting layer.

For example, the coating system is applied to the glazing unit <NUM> to transform it to a low-E glazing unit. This metal-based coating system such as low-E or heatable coating systems.

In some embodiment, the coating system can be a heatable coating applied on the glazing unit to add a defrosting and/or a demisting function for example.

As the coating system, for example, a conductive film can be used. As the conductive film, for example, a laminated film obtained by sequentially laminating a transparent dielectric, a metal film, and a transparent dielectric, ITO, fluorine-added tin oxide (FTO), or the like can be used. As the metal film, for example, a film containing as a main component at least one selected from the group consisting of Ag, Au, Cu, and Al can be used.

Preferably, the coating system is placed on the majority of one surface of the glazing unit and more preferably on the whole used surface of the glass pane.

In some embodiments, a masking element, such as an enamel layer, can be add on a part of the periphery of the glazing unit.

A simple approach to this problem of RF energy reflection is to remove a portion of the coating system to avoid to have a high reflectance for RF radiation. This approach, however, reduces the solar control benefits offered by the glazing unit and for equipment located inside the building, the vehicle or the car, the region would be unacceptably large. On top of that, the transition between the decoated zone and the coating itself is eye-visible and usually non-accepted by users.

Another solution has been to cut lines in the coating system to create a surface which is frequency selective, that is, it has relatively high reflectivity/absorbance for solar energy but relatively high in transmittance in the RF region of the electromagnetic spectrum. The cutting may be performed by laser ablation and the spacing of the slits is chosen to provide selectivity at the desired frequency.

In embodiments where the coating system is placed on S12, a decoated zone is present in front of the housing allowing waves to pass through the first glass pane to the device.

The decoated zone can be a zone without coating and because this zone is small compared to the size of the first inner glass pane thermal performances are not impacted. The decoated zone can be a frequency selective surface.

According to the invention, the frequency selective decoated zone of the coating system may be a series or patterns of intersecting ablated paths may be created in the coating system, while leaving behind the coating system in untouched areas and only a very small percentage of the area of the coating system is removed from the glazing panel, and most of the coated glass remains untouched to keep performances of the coating system.

These paths are produced in such a way as to create areas of the coating system allowing the glazing panel to retain most of its energy conserving properties or heatable properties, while the ablated paths allow passage of RF signals through the glazing panel.

In various embodiments, paths can be made by pulse laser to create spots. The diameter of the spot is about <NUM>-<NUM>, so that each path will be approximately this width. In alternative embodiments, different sized spots (e.g., <NUM>-<NUM> microns in diameter) and paths may be used. Moreover, the spots overlap and the amount of overlap may be approximately <NUM>% by area; the extent of overlap may vary in alternative embodiments. In some embodiments, the overlap may range from <NUM>% to over <NUM>% for example. The pattern of ablated intersecting paths may be varied.

In some embodiments, the decoated area of a coated system may be <NUM>% or less of the total coated area depending of the application, the material used in the glazing unit,. In other embodiments, a different percentage may be used (e.g. <NUM>% or less total area of the coating system removed, and <NUM>% total area of a coating system retaining untouched). In other embodiments, the coated system is decoated on at least one portion of his surface, this decoated zone represents less than <NUM>% of the coating in this zone. In others embodiments, several decoated zone can be present and the decoated surface is at most <NUM>% of the total coated area.

The decoated zone can be made on other parts of the surface of the glass pane, then another percentage can be done. Some designs can also change in percentage.

Note that while ablation of a higher percentage of the area may improve the transmission of RF signals through the glazing unit, ablation of more of the coating system diminishes the energy conserving properties heatable and performances of the glazing unit.

As shown in <FIG>, a housing <NUM> according to the invention is fixed on the S12 surface of the first outer glass pane <NUM> allowing to have a better tolerances with glass pane thicknesses while having a better matching for high angles of incidences.

The housing can be made of different parts <NUM>, <NUM>, <NUM>. These parts allows to fix the housing to the S12 surface and to intervene on the electronic elements such as the communication device <NUM>.

The housing may have fixed part <NUM> fixed on the S12 surface and a movable part <NUM> such as a cover to protect the inside of the housing when the housing is not used or to protect the electronics devices once there are in. The movable part can be assembled to the fixed part by any suitable means such as screw, clip, barbhook, male/female elements or any other means able to keep the movable part assembled to the fixed part.

According to some embodiment of the invention, the communication device comprises at least an RF front-end module for <NUM> and/or <NUM> systems. This module in turn can incorporate an antenna element or an array of antenna elements, and RF modules such as TX power amplifiers, RX low noise amplifiers, up and down convertors, and Phase-locked loop (PLL). The antenna element(s) can be single-polarized or dual-polarized depending on the application. When beamforming is required to improve the signal to noise and interference ratio, a passive or active phased-array antenna can be used, for example in mm-Wave.

Alternatively, to avoid degradation of beamforming performances, the communication device is placed at least at one quarter of the operation wavelength (λ/<NUM>) from the edge of the glazing unit.

The module can be used for an integrated or detached indoor repeater (either in the same or different technology), fixed wireless CPE, TV decoder, and/or DAS system to enhance the link performance among indoor user's terminals and the provider's fixed stations such as base stations, small cells, and active repeaters. These provider's fixed stations are at least at <NUM> far from the glazing unit, typically from <NUM> to <NUM> far from the glazing unit.

In some embodiment according to the invention, a communication system comprising at least a glazing unit according to the invention and a provider fixed station or active or passive repeater, which is placed at least at <NUM> outside from the glazing.

In some embodiment according to the invention, a communication system may comprising at least a glazing unit as described to provide indoor and/or outdoor coverage as a fixed access point. In these cases, the glazing unit is becoming a fixed station providing signal to users. Users can be inside and/or outside of the building.

The module can be also used for an outdoor repeater (either in the same or different technology) and/or a serving cell to boost the network coverage outdoors.

By indoor, it is understood that it is inside the building where the glazing unit is installed while outdoor means outside the said building.

The said communication device is fixed to the housing by at least one fixing mean <NUM>. Alternatively, depending on the application, the said at least one fixing means can be removable fixing means such a screw,. The at least one fixing means can also have a distance regulation system to place the communication device in a defined distance from S12 such Archimedes' screw.

Alternatively, the communication device is low power to control the heat dissipation around the glazing unit.

In some embodiments according to the invention, the housing may comprise a heatsink to dissipate the generated heat from the electronic elements. This heatsink is thermally connected by at least one element <NUM> to the communication device. Thermally means that the heat generated by at least the RF module can flow to the heatsink to be dissipated. The heat sink size and type is chosen to limit the temperature increase on the surface S12 of the glazing unit in front of the communication device and also depending on the electronic used in the communication device.

The housing can be made of plastic such as polycarbonate, ABS, PU, PMMA, or any other plastic material able to use as an housing. The housing can be made of metallic material such as aluminum. Alternatively, material used for the housing is UV resistance and low expansion material.

The sides, the cover and the bottom of the housing can be made in the same material or different material. Sides and/or cover and/or bottom, if exists, can be made in a single piece or different pieces.

According to the invention, a treatment such as a paint, an local etching,. can be applied at least in front of the housing to avoid UV issues or to hide the housing from outside.

In some embodiments according to the invention, where the first outer glass panel is low in transmittance for the operation frequency range and/or for a given polarization and an angle of incidence, a matching element <NUM> can be added between the S12 surface of the first outer glass panel and the communication device to maximize the transmission of the signal through the first outer glass panel.

When the communication device incorporates a phased-array antenna to be able to perform beamforming, a first outer glass panel with high reflectance within the operation frequency range and/or for a given polarization and an angle of incidence increases the mutual coupling among the antenna elements, and deteriorates the RF components performance.

Surprisingly, the matching element decreases the mutual coupling and thus allows the electronics to work properly.

According to the invention, the matching element is composed of at least a dielectric, preferably with a permittivity between <NUM> and <NUM>, and with a low loss factor, preferably below <NUM>. It can comprise two or more dielectrics and some periodic and/or pseudo-periodic metallic patterns (with some resonance between <NUM> to <NUM> times of the operation frequency).

The matching element has alternatively a thickness between <NUM> to <NUM>, and is placed at a distance of between <NUM> to <NUM> from S12 surface.

As shown in <FIG>, <FIG> and <FIG>, a matching layer <NUM>, <NUM> is embedded or is a part of the housing, especially part of the flat part of the bottom <NUM>, <NUM> of the housing, to minimize the cost and the handling. This matching layer <NUM>, <NUM> is in front of the communication device <NUM>, <NUM>.

In some embodiments according to the invention, The matching layer can be fixed to sides <NUM>, <NUM> or to the cover <NUM>, <NUM> of the housing. The matching layer <NUM>, <NUM> can be fixed to the communication device <NUM>, <NUM>.

Alternatively, there is at least a distance equivalent to one tenth of the operation wavelength (λ/<NUM>) between the communication device and the matching element to avoid antenna detuning.

In some embodiments, this matching element can be incorporated, embedded to the bottom or at least one side of the said housing. In some other embodiments, the matching element can be fixed to the communication device or can be fixed to the S12 surface.

According to the invention, for an first outer glass panel with a thickness of around <NUM> - <NUM>, the matching element can comprise a polycarbonate layer with a thickness of <NUM> at a <NUM> distance from the S12 surface at <NUM>.

According to the invention, for an first outer glass panel with a thickness of around <NUM> - <NUM> , the matching element can comprise a polycarbonate layer with a thickness of <NUM> at a <NUM> distance from the S12 surface at <NUM> and for a wide scan range of beamforming.

Alternatively, the matching element is at least substantially the same size as the antenna aperture (not shown) of the communication device to maximize the signal transmission.

Alternatively, depending on the application, the said matching layer can be removable fixed with means such a screw,. The at least one fixing means can also have a distance regulation system to place the matching layer in a defined distance from S12 such Archimedes' screw.

As shown in <FIG> and <FIG>, the opening is not in a corner but in a side of the second inner glass pane <NUM>. Preferably in these embodiments, the opening has a rectangular shape and preferably one side of the side rectangular has substantially the same size that the side of the second inner glass sheet meaning that the second inner glass pane a cut portion along a side (in the X-axis and/or Z-axis) where the housing having slightly the same dimension than the cut portion to have substantially the same dimensions than the first outer glass pane. Dimensions of the housing in X- and Z- axis slightly correspond to the difference between dimensions of first outer glass pane <NUM> and second inner glass pane <NUM>. It means that DhW slightly equals to DW.

In this embodiment, the housing can fixed at least on the first outer glass panel <NUM> thought the said opening <NUM> or fixed to the second inner glass panel or fixed to the spacer. Usually, the glazing unit <NUM> is inserted into a frame, being placed in a space provided for this purpose in a building. The frame has a U-form shape allowing to insert the glazing unit in the U-form. A part of the housing is then inserted in the U-form of the frame (not shown). The frame has a weather strip (not shown) around it to ensure the tightness between the frame and the glazing unit. This weather strip presses the first outer glass pane on one side and the second outer glass pane and the housing on the other side. The housing can also be placed in the opening and secured by the frame. In this case, the frame is over a least a part of housing as the frame is over a part of the glass panels.

The invention also discloses a communication system comprising at least a glazing unit according to any preceding claims and a provider fixed station or active or passive repeater, which is placed at least at <NUM> outside from the glazing unit.

The glazing unit can be placed on a façade of a building as a window. The glazing unit according to the invention can also be placed as a window of a vehicle.

The user inside a building or a vehicle can receive the signal from a far (at least one meter) fixed station or active or passive repeater directly through the glazing without the need of an external element such as an exterior repeater, retrieving the signal from the provider fixed station or active or passive repeater to communicate in fine with the communication device of the glazing unit according to the invention.

Claim 1:
Glazing unit (<NUM>) extending along a plane, P, defined by a longitudinal axis, X, and a vertical axis, Z; having a width, DW, measured along the longitudinal axis, X, and a length, DL, measured along the vertical axis, Z, comprising
- at least a first outer glass panel (<NUM>) having a S11 surface and a S12 surface and a second inner glass panel (<NUM>) having a S21 surface and a S22 surface combined together by at least a means (<NUM>) of maintaining the two glass panels at a certain distance between the surface S12 of the first outer glass panel and the surface S21 of the second inner glass panel,
- a housing (<NUM>) able to accommodate a <NUM> and/or <NUM> communication signal device,
- an opening (<NUM>) arranged on the second inner glass panel
characterized in that the opening has substantially same dimensions in plane P as the said housing and in that the housing is placed in the said opening.