• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The invention relates to a radome (4) for protecting an antenna capable of radiating and / or picking up radio waves in a given range of frequencies from 3 MHz to 300 GHz, the radome being equipped with a radio frequency heater (10) comprising two electrical contacts (14, 16) between which are arranged resistive heating elements (12) in the form of parallel strips spaced from one another and each having two ends respectively connected to the two electrical contacts (14, 16 ), each of the strips (12) being made using a network of nano-elements comprising metal nanowires (18).
    公开号:FR3041166A1
    申请号:FR1558498
    申请日:2015-09-11
    公开日:2017-03-17
    发明作者:Caroline Celle；Laurent Dussopt；Jean-Pierre Simonato
    申请人:Commissariat a lEnergie Atomique CEA；Commissariat a lEnergie Atomique et aux Energies Alternatives CEA；
    IPC主号:
    专利说明:

    RADOME EQUIPPED WITH A HEATING RESISTIVE SYSTEM STRUCTURE IN BANDS OF METAL NANO-ELEMENTS
    DESCRIPTION
    TECHNICAL AREA
    The present invention relates to the field of radomes for protecting an antenna capable of radiating and / or sensing radio waves in a given range of frequencies from 3 MHz to 300 GHz. Preferably, these radomes are intended for antennas radiating / sensing super-high frequency (3 GHz to 30 GHz) or extremely high frequency (30 to 300 GHz) waves. The invention relates in particular to the heating system integrated in the radome, provided for its defrosting and / or demisting. The invention finds particular applications in the automotive, telecommunications, military and aeronautical fields.
    STATE OF THE PRIOR ART
    Frost accumulating on a radome can degrade the operation of the system with which it is associated. Indeed, frost filters the passage of radio waves and thus limits the transparency of the radome to these same waves. In this regard, it is noted that the detection distance of a radar is directly correlated to the radome transparency to the radio waves. Thus, under certain circumstances, the detection distance of a sensor may be so weakened by the presence of frost that the sensor must be disabled.
    It has therefore been proposed radome heating solutions, so as to allow defrosting and extend the range of use of the associated system. Numerous techniques make it possible to ensure such heating, such as resistive heating to eliminate frost by Joule effect. However, this technique comes up against the problem of preserving the transparency of the radome to the waves concerned.
    So far, no solution has led to a resistive heating of sufficient intensity, while maintaining the required transparency to radio waves.
    STATEMENT OF THE INVENTION
    In order to at least partially meet the drawbacks mentioned above, the invention firstly relates to a radome intended to protect an antenna capable of radiating and / or picking up radio waves in a given range of frequencies of 3 MHz at 300 GHz, said radome being equipped with a heating system comprising two electrical contacts between which resistive heating elements are arranged.
    According to the invention, said resistive heating elements are parallel strips spaced apart from each other and each having two ends respectively connected to the two electrical contacts, each of the strips being made using a network of nano-elements comprising metallic nanowires.
    Surprisingly, the structuring of the heating system into metal nanowire strips makes it possible to obtain satisfactory resistive heating for defrosting the radome, while maintaining a high level of transparency to the radio waves concerned. In addition, these nano-elements having high transparency properties in the visible spectrum, the invention can advantageously be applied to semi-transparent radomes without significantly altering the optical transparency properties of this radome.
    Finally, the invention can be easily implemented using controlled techniques, low cost, and perfectly suited for structuring bands on a flat support or more complex form. For example, the deposition of nano-elements can be achieved by spray, low temperature and high speed, widely controlled technology especially in the automotive field. The invention preferably has at least one of the following optional features, taken singly or in combination.
    The radome has a transparency to the radio waves, in said given range, greater than 50%, and more preferably greater than 70%.
    Similarly, in order to maintain optical transparency properties, the radome has an overall transmittance greater than 60% in the visible spectrum, and more preferably between 70 and 90%.
    Preferably, said nano-elements are based on silver and / or copper and / or nickel and / or gold.
    Preferably, the strips have a first width L1 strictly less than half the length λ of the radio wave radiated / picked up by the antenna, and the period P in which the bands succeed one another is substantially equal to the product η.λ , with n corresponding to a natural integer preferably not equal to 1. This configuration makes it possible to further improve the invention, in terms of resistive heating performance and level of transparency to the radio waves concerned.
    Preferably, the strips have a first identical width L1 for each strip, and they are separated by inter-strip areas having a second identical width L2 for each inter-band area, the ratio between the second width L2 and the first width L1. being greater than or equal to 1. However, the width of the bands could differ from one band to another, without departing from the scope of the invention. It is the same for inter-band areas.
    Preferably, the first width L1 is between 0.5 and 3 mm, and more preferably of the order of 2 mm.
    Preferably, the second width L2 is between 4 and 10 mm.
    According to a first exemplary embodiment: each band has an electrical resistance of between 3 and 4 Ω; the first width L1 is approximately 2 mm; and the second width L2 is about 2 mm.
    This first embodiment proves to be perfectly suitable for many applications, in particular in the field of telecommunications with antennas operating at 60 GHz.
    According to a second exemplary embodiment: each band has an electrical resistance of between 8 and 10 Ω; the first width L1 is approximately 2 mm; and the second width L2 is between 4 and 6 mm.
    This second embodiment proves to be perfectly adapted for many applications, in particular in the field of the automobile and its ACC applications (of the English "Auto Cruise Control"), implementing sensors of long-distance detection integrating antennas operating at 77 GHz.
    Preferably, the radome has a main structure on which is deposited the heating system, this main structure having an intrinsic transparency to radio waves in the given range, greater than 70%.
    Preferably, the main structure is made of poly (ethylene naphthalate) or acrylonitrile butadiene styrene, although other plastic materials may be envisaged, without departing from the scope of the invention.
    Preferably, the radome is coated with an anti-scratch and / or thermal conduction layer. The invention also relates to an assembly comprising an antenna capable of radiating and / or picking up radio waves in a given range of frequencies from 3 MHz to 300 GHz, and a radome as described above.
    Preferably, for a better transparency to the waves, the radome is arranged so that its bands are parallel to the direction of polarization of the antenna.
    Depending on the intended application, the antenna is preferably designed to radiate and / or capture radio waves of 24 GHz, 60 GHz or 77 GHz. Other frequencies or frequency ranges are of course conceivable, without departing from the scope of the invention. Other advantages and features of the invention will become apparent in the detailed non-limiting description below.
    BRIEF DESCRIPTION OF THE DRAWINGS
    This description will be made with reference to the appended drawings among which; FIG. 1 represents a schematic view of an assembly according to the invention, for example of the type of long-range detection sensor; FIG. 2 represents a front view of the radome equipping the assembly shown in FIG. 1; FIG. 3 is a schematic view showing the strips of nano-elements of the radome, arranged parallel to the direction of polarization of the antenna.
    DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS
    Referring firstly to Figure 1, there is shown a set 1 according to a preferred embodiment of the invention. This set 1 is a system dedicated to the field of telecommunications, and includes an antenna 2 operating at a frequency of 60 GHz, and a radome 4 protecting this antenna. Indeed, terrestrial telecommunication networks use a large number of point-to-point links (radio links) to transmit long-distance communications, or to interconnect different parts of the same network. The antennas of these links are generally arranged on high points (pylons, buildings, mountains) and thus naturally exposed to bad weather including frost and snow. Typical bands used are 30-45 GHz, 57-66 GHz and 71-86 GHz.
    However, other applications are possible, for example a long-range detection sensor for the automotive field, in which the antenna operates at a frequency of the order of 77 GHz. Still in the automotive field, the assembly 1 could be a proximity sensor, with an antenna operating at a frequency of 24 GHz.
    However, the invention covers all together 1 comprising an antenna and its radome, with the antenna capable of radiating and / or sensing radio waves in a given range of frequencies from 3 MHz to 300 GHz. The main fields of application are automotive, military and aeronautics.
    Referring now to FIG. 2, there is shown the radome 4 which forms part of the outer casing 6 of the assembly 1.
    The radome 4 is here planar, but could have a more complex shape, for example single or double curvature. It comprises a main plastic structure 8, having a transparency intrinsic to the radio waves concerned, greater than 70%. Conventionally, this transparency corresponds to the percentage of transmitted radiation, defined by the ratio between the power transmitted and the incident power. The radio-wave transparency of the main structure can reach very high values, depending on the nature of the material. For example, a structure 8 of ABS (acrylonitrile butadiene styrene), 3 mm thick, has a transparency to radio waves of the order of 72%. A structure 8 of PEN (polyethylene naphthalate), 125 pm thick, has a transparency to electric waves up to 98%. Other materials are possible for the structure 8, for example polyethylene terephthalate, KAPTON® polyimide, polycarbonate, PMMA (PolyMethylMethAcrylate), copolymer ASA Acrylonytrile Styrene Acrylate, PE (PolyEthylene), PP (PolyPropylene), PES. The thickness of the main structure 8 is best adapted to optimize the transparency to radio waves. It is typically of the order of 1 to 3 mm, but can of course be lower as for the example of PEN described above. In general, the decrease in the thickness of the structure makes it possible to increase the transparency to the radio waves. One of the particularities of the invention lies in the presence of a heating system 10 equipping the main structure 8 of the radome. It is a system comprising resistive heating elements forming strips 12 spaced from each other, and parallel to each other. In this respect, it is stated that when the structure 8 is non-planar, the parallelism between the strips 12 is characterized by the parallelism of the planes containing each of these strips.
    The strips 12 have a first width Ll, identical for all the bands. These also have the same length for example between 2 and 20 cm, and preferably between 5 and 15 cm, and the same thickness which is for example between 100 and 50,000 nm. The strips 12 are each made using a network of nano-elements 18 comprising metal nanowires. By nanowires, it is understood elements whose ratio between the length and diameter is greater than 10, and whose diameter may vary from 20 to 800 nm.
    These metal nanowires 18 are preferably made using a metal of the Ag, Au, Ni or Cu type, or with a material containing at least 50% of one of the aforementioned metals. Metal nanowires made in different materials selected from the group mentioned above can be mixed within the network deposited on the structure 8, without departing from the scope of the invention. Moreover, other types of nano-elements can also be integrated therein, such as carbon nanotubes and / or derivatives of this type of nanotubes, graphene sheets and / or derivatives of this type of material, and or else nano-elements based on boron nitride or metal oxides, for example of the hexagonal boron nitride (h-BN), ZnO or SiO 2 type.
    The nano-elements 18 form a percolating surface network deposited on the surface of the main structure 8 forming a substrate. Its surface density may be of the order of 10 to 100 mg / m 2, and more preferably of the order of 20 to 70 mg / m 2. At two opposite ends of each strip 12, there is provided respectively an electrical input contact 14 and an electrical output contact 16, each made with a thin copper blade or silver paste. These contacts 14, 16 have linear resistances much lower than those of the strips 12, in order to ensure the resistive heating in the network of metal nanowires 18. They are for example of the metal film type, obtained by evaporation or Ti / Au sputtering. Cr / Au, Cr / Alu. The deposit may also be carried out using a lacquer, for example a silver lacquer, or using electrically conductive adhesives.
    The electrical contacts 14, 16 make it possible to apply an electrical voltage to the networks 18 forming resistive heating elements. This voltage is delivered by an appropriate apparatus 20, possibly adapted for feeding the antenna 2, as has been shown schematically in FIG. 1. The envisaged supply voltages are between 1 and 20V, and preferably between 1 and 20V, and preferably between 1 and 20V. and 12V.
    The equivalent resistance formed by all the strips 12 of the heating system 10 is for example between 5 and 250 ohm.
    The strips 12 are spaced apart by inter-band zones 22 on which the main structure 8 is left free, that is to say without deposition of nanowires 18. These zones 22 have a second identical width L2 for all the zones, and greater than or equal to the first width L1 of the strips 12. The ratio between the two widths L1 and L2 is therefore preferably greater than or equal to 1. The sum of the two widths L1 and L2 also corresponds to the period P in which the bands 12 succeed each other on the main structure 8.
    Preferably, the first width L1 is between 0.5 and 3 mm, and even more preferably of the order of 2 mm, while the second width L2 is preferably between 2 and 8 mm.
    The dimensions L1 and P are chosen in relation to the wavelength of the incident signal. The latter is defined as A = c / f, where c is the celerity of light (299,792,458 m.s_1) and f is the frequency of the wave (in Hz). For example, the associated wavelength is 3.9 mm for working frequencies at 77 GHz, or 12.5 mm for working frequencies of 24 GHz.
    The first width L1 of the strips 12 of silver nanowires is defined as being the smallest possible, for example 0.5 mm, and whose maximum value is of the order of λ / 2, ie typically about 2 mm to 77 mm. GHz. The period P may be substantially equal to a multiple of λ, ie typically about 4, 8 or 12 mm at 77 GHz. Thus, it is preferably made so that P is substantially equal to the product η.λ, with n corresponding to a natural integer preferentially different from 1. For information purposes, a margin of plus or minus 10% remains perfectly acceptable between the value of P and the product value η.λ.
    Deposition of the nanowire strips 18 is done in a conventional manner. The nanowires can for example be deposited at high flow rate and at low temperature using a spray and a stencil masking the inter-band zones 22. Alternatively, the deposition of nanowires can be performed on the entire surface of the structure 8, to then be structured in order to reveal the strips 12 by eliminating the nanowires at the inter-band zones 22. This elimination can be achieved by ablation (solution etching or laser firing). The technique of deposition by nebulization is also envisaged, without departing from the scope of the invention.
    The nanowires 18 are previously obtained in a conventional manner. For example, copper nanowires can be synthesized according to the technique disclosed in the publication Nano Research 2014, 7 (3): 315-324. For silver nanowires, these can be prepared according to the procedure described in Nanotechnology 2013, 24, 215501.
    The structure 8, equipped with its strips 12 of metal nanowires 18, may be coated with an anti-scratch protection layer (not visible in FIG. 2), and / or with a thermal conduction layer to best diffuse the heat generated by Joule effect on the entire surface of the radome. This layer may be of the polymer, resin, varnish or other type, or an adhesive film. For example, it is a PSA barrier adhesive laminated on the structure 8, or a PU polyurethane varnish applied by spray on this structure.
    Depending on the intended application, the radome 4 may have optical semi-transparency properties, with a transmittance greater than 60% in the visible range, namely for wavelengths ranging from 390 to 780 nm. This transmittance, also called transmission factor or transparency, may nevertheless be greater for the radome 4, for example between 70 and 90%. This very high transmittance range can be obtained by judiciously choosing the material of the structure 8, its thickness, and judiciously fixing the widths L1 and L2. This allows the radome 4 to retain its optical semi-transparency functions, when such a function is desired.
    In addition, the radome equipped with the strips 12 has an overall transparency to the radio waves concerned, greater than 70%. Surprisingly, the simple structuring in bands or "rake teeth" of the resistive elements effectively makes it possible to obtain a high transparency to the radio waves, while providing a satisfactory heating to generate a defrosting or demisting. This effect is all the more surprising when, when the entire surface of the structure 8 is coated with nanowires, the transparency to the radio waves does not exceed 25%, even by lowering the density of these nanowires to very low values. This level of transparency is totally insufficient to allow the associated system to function properly, and the low density of nanowires leading to this level of transparency does not in any case make it possible to obtain suitable temperatures to ensure correct defrosting of the system. radome.
    Tests highlighting these conclusions have been performed, and the results of these tests are listed in the table below. In this table, the first column represents the surface electrical resistance of the layer of nanowires, this resistance being inversely proportional to the density of the nanowires within the layer. The second column corresponds to the transmittance for a wavelength of 550 nm. The transparency to radio waves (RF transparency) is the subject of the third column, for waves transmitted at 60GHz. Finally, the fourth column reports the temperature obtained on the surface of the radome.
    These tests, which in no way implied that a particular structuring of the layer of metal nanowires could lead to both satisfactory resistive heating and high RF transparency, were carried out under the following conditions. A. Synthesis of the Silver Metallic Nanowires The development of the silver nanowires in solution is carried out according to the following method: 1.766 g of PVP (polyvinylpyrrolidone) are added to 2.6 mg of NaCl (sodium chloride) in 40 ml EG (ethylene glycol). The mixture is stirred at 600 rpm (rpm) at 120 ° C until complete dissolution of the PVP and NaCl (about 4-5 minutes). This mixture is then added dropwise to a solution of 40 ml of Ethylene Glycol ("EG") in which are dissolved 0.68 g of AgNO 3 (silver nitrate). The oil bath is then heated to 160 ° C and stirring at 700 rpm is operated for 80 minutes. Three washes are made with methanol by centrifuging at 2000 rpm for 20 min, then the nanowires are precipitated with acetone, and finally redispersed in water or methanol. B. Printing of electrical strips and contacts
    The substrate chosen is a PEN substrate of 125 μm of 10 × 10 cm. This substrate corresponds to the main structure of the radome. The substrate here has an intrinsic RF transparency of 98%, for waves generated at 60 GHz by the antenna
    The electrical contacts consist of a deposit of 150 nm Au, made by cathodic sputtering before printing the nanowire strips. The elaboration of the strips is carried out by full-plate spray of a network of silver nanowires with a homogeneous density of a solution of 0.5 g / l metal nanowires in methanol. This step can be performed using a Sonotek® spray. Four samples with increasing nanowire densities are prepared.
    The protective layer of the radome consists of a PSA barrier adhesive laminated on the sample. C. Radome transparency
    The transmittance and RF transparency performance is given in columns 2 and 3 of the table above. The results made it possible to draw the conclusions outlined above. D. Joule heating
    The ambient temperature during measurements is 25 ° C. The temperatures given in the fourth column are measured after 2 minutes of stabilization at the applied voltage, here 12V. The heating rates are of the order of 1 ° C / s. Now, two embodiments of the invention will be described. These two examples were made with the strips 12 oriented parallel to the polarization of the antenna, as can be seen in FIG. 3. On this, the antenna 2 with a single linear polarization is shown, the direction of propagation of the wave 2a, and the polarization direction of the antenna 2b. The strips 12 are parallel to the direction of polarization 2b.
    Example 1
    The first example is ideally suited for the telecommunications field, with antennas operating at around 60 GHz. The operating conditions are identical to those mentioned above in points A to D, with the following exceptions: - RF transparency is studied at 66 GHz. nanowire strips are produced with a first width L1 of 2 mm, and the inter-band zones are first fixed with a second width L2 of 2 mm (leading to a period P of 4 mm), then the second width is fixed at 6 mm (leading to a period P of 8 mm).
    The results of these tests are given in the table below.
    In this first example, the surface electrical resistance is extremely difficult to determine on each band, which is why the first column of the table provides information on the electrical resistance of each band. This resistance is also called "resistance 2 points", because it is measured between the two occasions of each electrical contact, at both ends of one of the bands.
    This first example shows that it is possible to obtain an extremely high RF transparency with carefully chosen values for the values L1 and L2. More precisely, with an L1 value of 2 mm and a L2 value of 2 mm, the RF transparency can reach 98% at 66 GHz (with a band electrical resistance of between 3 and 4 Ω, preferably 3.5 Ω). This transparency obtained for the test described in the first line of the table is notably higher than the transparency obtained during the second test associated with the second line. However, in this second test, the density of nanowires is lower and the second width L2 of the inter-band areas is higher. Intuitively, this would lead to increase the RF transparency, but the tests disclose the opposite to choose a particular combination for the values of L1 and L2 to maintain an almost perfect RF transparency.
    The generated resistive heating is also very satisfactory for the combination chosen, since a temperature of 44 ° C was obtained with the application of a voltage of 5V. As such, it is noted that an increase in the applied voltage allows a rise in the surface temperature. Heating limits are however associated with the thermal resistance of the plastic structures 8. For example, with a voltage of 9V for the second test, the temperature goes to 60 ° C instead of 40 ° C obtained at 6V.
    Example 2
    The second example proves to be perfectly suited for the field of long-range detection sensors for the automotive field, with an antenna operating at a frequency of the order of 77 GHz. This type of sensor is particularly suitable for ACC applications.
    For this second example, the operating conditions are identical to those of the first example, with the following exceptions: - the RF transparency is studied at 77 GHz. - for the first two tests, the main structure of the radome is made on 2.4 mm thick ABS, with an intrinsic RF transparency of 72%, while for the third test, the main structure of the radome is identical to that of the first test; nanowire strips are produced with a first width L1 of 2 mm, and the inter-band areas are first fixed with a second width L2 of 4.5 mm (leading to a period P of 6.5 mm for this first test), then the second width is fixed at 7.5 mm (leading to a P period of 9.5 mm for this second test), and finally the second width is fixed at 5.5 mm (leading to a period P 7.5 mm for this third test).
    The results of these tests are given in the table below.
    This second example also shows that it is possible to obtain an extremely high RF transparency with carefully chosen values for the L1 and L2 values, and for a principal structure of a given nature. More specifically, with a value L1 of 2 mm and a value L2 between 4 and 5 mm, preferably 4.5 mm, the RF transparency can reach 97% at 77 GHz (with a band electrical resistance of between 9 and 10 Ω preferably 9.5 Ω). This RF transparency obtained during the test described in the first line of the table is notably higher than the RF transparency obtained during the second test associated with the second line. However, in this second test, the density of nanowires is lower and the second width L2 of the inter-band areas is higher. Intuitively, this should lead to increase the RF transparency, but the tests reveal the contrary that there is a particular combination for the values of L1 and L2 to maintain a near perfect RF transparency.
    The generated resistive heating is also very satisfactory for the combination chosen, since a temperature of 40 ° C was obtained with the application of a voltage of 10V.
    In the same way, with the different main structure chosen for the third test, the most satisfactory combination resides in a value L1 of 2 mm and a value L2 between 5 and 6 mm, preferably 5.5 mm. The RF transparency can then reach 98% at 77 GHz (with a band electrical resistance of between 8 and 9 Ω, preferably 8.5 Ω). The generated resistive heating is also very satisfactory for the combination chosen, since a temperature of 42 ° C was obtained with the application of a voltage of 9V.
    Of course, various modifications may be made by those skilled in the art to the invention which has just been described, solely by way of non-limiting examples.
    权利要求:
    Claims (16)
    [1" id="c-fr-0001]
    1. Radome (4) for protecting an antenna (2) capable of radiating and / or picking up radio waves in a given range of frequencies from 3 MHz to 300 GHz, said radome being equipped with a heating system ( 10) comprising two electrical contacts (14, 16) between which resistive heating elements (12) are arranged, characterized in that said resistive heating elements (12) are parallel strips spaced from one another and each having two ends respectively connected to the two electrical contacts (14, 16), each of the strips (12) being made using a network of nano-elements comprising metal nanowires (18).
    [2" id="c-fr-0002]
    2. Radome according to claim 1, characterized in that it has a transparency to radio waves, in said given range, greater than 50%, and more preferably greater than 70%.
    [3" id="c-fr-0003]
    3. Radome according to claim 1 or claim 2, characterized in that it has an overall transmittance greater than 60% in the visible spectrum, and more preferably between 70 and 90%.
    [4" id="c-fr-0004]
    4. Radome according to any one of the preceding claims, characterized in that said nano-elements (18) are based on silver and / or copper and / or nickel and / or gold.
    [5" id="c-fr-0005]
    5. Radome according to any one of the preceding claims, characterized in that the strips (12) have a first width (L1) strictly less than half the length (λ) of the radio wave radiated / picked up by the antenna, and in that the period (P) in which the bands (12) succeed one another is substantially equal to the product η.λ, with (n) corresponding to a natural integer preferably different from 1.
    [6" id="c-fr-0006]
    6. Radome according to any one of the preceding claims, characterized in that the strips (12) have a first width (L1) identical for each band, and in that they are separated by inter-band zones (22). having a second identical width (L2) for each interband area, the ratio between the second width (L2) and the first width (L1) being greater than or equal to 1.
    [7" id="c-fr-0007]
    7. Radome according to claim 6, characterized in that the first width (L1) is between 0.5 and 3 mm, and preferably of the order of 2 mm.
    [8" id="c-fr-0008]
    8. Radome according to claim 6 or claim 7, characterized in that the second width (L2) is between 4 and 10 mm.
    [9" id="c-fr-0009]
    9. Radome according to any one of claims 6 to 8, characterized in that: - each band (12) has an electrical resistance of between 3 and 4 O; the first width (L1) is approximately 2 mm; and the second width (L2) is about 2 mm.
    [10" id="c-fr-0010]
    10. Radome according to any one of claims 6 to 8, characterized in that: - each strip (12) has an electrical resistance of between 8 and 10 O; the first width (L1) is about 2 mm; and the second width (L2) is between 4 and 6 mm.
    [11" id="c-fr-0011]
    11. Radome according to any one of the preceding claims, characterized in that it has a main structure (8) on which is deposited the heating system (10), said main structure having an intrinsic transparency to radio waves, in said given range, greater than 70%.
    [12" id="c-fr-0012]
    12. Radome according to the preceding claim, characterized in that the main structure (8) is made of poly (ethylene naphthalate) or acrylonitrile butadiene styrene.
    [13" id="c-fr-0013]
    13. Radome according to any one of the preceding claims, characterized in that it is coated with an anti-scratch and / or thermal conduction layer.
    [14" id="c-fr-0014]
    An assembly (1) comprising an antenna (2) capable of radiating and / or picking up radio waves in a given range of frequencies from 3 MHz to 300 GHz, and a radome (4) according to any one of the claims preceding.
    [15" id="c-fr-0015]
    15. An assembly according to the preceding claim, characterized in that the radome (4) is arranged so that its bands are parallel to the polarization direction of the antenna (2).
    [16" id="c-fr-0016]
    16. An assembly according to claim 14 or claim 15, characterized in that the antenna (2) is designed to radiate and / or pick up radio waves of 24 GHz, 60 GHz or 77 GHz.
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    EP3347945A1|2018-07-18|
    US20180269559A1|2018-09-20|
    FR3041166B1|2018-09-28|
    EP3347945B1|2019-08-14|
    WO2017042284A1|2017-03-16|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US20070252775A1|2006-04-26|2007-11-01|Harris Corporation|Radome with detuned elements and continuous wires|
    EP2741105A2|2012-12-07|2014-06-11|Decoma GmbH|Vehicle body part|
    US5408244A|1991-01-14|1995-04-18|Norton Company|Radome wall design having broadband and mm-wave characteristics|
    US5528249A|1992-12-09|1996-06-18|Gafford; George|Anti-ice radome|
    US9616623B2|2015-03-04|2017-04-11|Ebert Composites Corporation|3D thermoplastic composite pultrusion system and method|KR101812024B1|2016-06-10|2017-12-27|한국기계연구원|A Heating Wire and A PLANAR HEATING SHEET comprising THE SAME|
    WO2021022884A1|2019-08-05|2021-02-11|深圳光启高端装备技术研发有限公司|Metamaterial, radome and aircraft|
    WO2021022885A1|2019-08-05|2021-02-11|深圳光启高端装备技术研发有限公司|Metamaterial, radome and aircraft|
    法律状态:
    2016-09-28| PLFP| Fee payment|Year of fee payment: 2 |
    2017-03-17| PLSC| Publication of the preliminary search report|Effective date: 20170317 |
    2017-09-29| PLFP| Fee payment|Year of fee payment: 3 |
    2018-09-28| PLFP| Fee payment|Year of fee payment: 4 |
    2019-09-30| PLFP| Fee payment|Year of fee payment: 5 |
    2021-06-11| ST| Notification of lapse|Effective date: 20210506 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1558498|2015-09-11|
    FR1558498A|FR3041166B1|2015-09-11|2015-09-11|RADOME EQUIPPED WITH A HEATING RESISTIVE SYSTEM STRUCTURE IN BANDS OF METAL NANO-ELEMENTS|FR1558498A| FR3041166B1|2015-09-11|2015-09-11|RADOME EQUIPPED WITH A HEATING RESISTIVE SYSTEM STRUCTURE IN BANDS OF METAL NANO-ELEMENTS|
    US15/758,469| US20180269559A1|2015-09-11|2016-09-08|Radome provided with a resistive heating system formed from strips of metal nanoelements|
    EP16763775.0A| EP3347945B1|2015-09-11|2016-09-08|Radome provided with a resistive heating system formed from strips of metal nanoelements|
    PCT/EP2016/071205| WO2017042284A1|2015-09-11|2016-09-08|Radome provided with a resistive heating system formed from strips of metal nanoelements|
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