A frequency independent radome antenna

Abstract

The application discloses a frequency-independent protective skin antenna, which comprises, from top to bottom, an upper skin, an upper core layer, a substrate film, an amorphous carbon film, an antenna, a lower core layer and a lower skin. When the skin antenna is not irradiated by high-power microwave, the amorphous carbon film allows electromagnetic waves to pass through, and the skin antenna works normally; when the skin antenna is irradiated by high-power microwave, the amorphous carbon film induces current, and a reflection effect is generated on the electromagnetic waves; meanwhile, the current induced on the surface of the amorphous carbon film rapidly generates heat, and the heat effect further enhances the conductivity of the amorphous carbon film, thereby increasing the reflection of the high-power microwave; after the irradiation of the high-power microwave is stopped, the conductivity of the amorphous carbon film disappears, and the skin antenna returns to normal work. Compared with the prior art, the application has the advantages of simplicity, frequency independence, shielding of high-power microwave signals of any incident frequency, no introduction of additional loss in the system link, and great value in the field of high-power microwave protection.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of high power microwave protection, in particular to a frequency-independent protective skin antenna. BACKGROUND

[0002] With the maturity of high power microwave weapon technology, electronic equipment of each platform is faced with the threat of unprecedented high power microwave irradiation. Through antenna coupling is the main way for high power microwave to enter the radio frequency front end of electronic equipment. Therefore, preventing high power microwave from entering the radio frequency front end of electronic equipment at the antenna end is an effective means of protection. At present, the main technical means of protection at the antenna end includes amplitude limiting antenna and energy selective radome. The amplitude limiting antenna changes the antenna radiation structure by loading switches on the antenna radiation structure, and changes the antenna radiation structure by the on-off of the switches excited by high power microwave, so as to realize the attenuation of the incident high power microwave signal. The energy selective radome changes the frequency response of the FSS by integrating the frequency selective surface (FSS) and the switch inside the traditional radome, and realizes the selective transmission of the incident high power microwave signal by the on-off of the switch excited by high power microwave. The above two methods can realize the attenuation of the incident high power microwave signal when the incident microwave signal is small, and the microwave signal can normally enter the internal electronic equipment. When the incident microwave signal reaches the on-off threshold field strength of the switch, the incident high power microwave signal can be attenuated. The above effect is because the switch is excited by the high power microwave signal, and the amplitude limiting antenna and the energy selective radome realize the change of the working frequency, i.e. from the original working frequency to the new working frequency. If the incident signal falls within the original working frequency band, the working frequency of the amplitude limiting antenna and the energy selective radome changes to another frequency, which attenuates the current incident frequency signal. However, when the incident high power microwave signal is exactly the new working frequency, the switch is still turned on, and the high power microwave signal can still enter the radio frequency front end of the electronic equipment, which still has the risk of damaging the electronic equipment. SUMMARY

[0003] The present application aims to provide a frequency-independent protective skin antenna to solve the frequency-dependent problem of high power microwave protection of the skin antenna.

[0004] The technical solution for achieving the purpose of the present application is as follows: a frequency-independent protective skin antenna, from top to bottom, comprising an upper skin, an upper core layer, a substrate film, an amorphous carbon film, an antenna, a lower core layer, and a lower skin, wherein the upper skin and the upper core layer, and the lower skin and the lower core layer are bonded by adhesive film, the amorphous carbon film is deposited on the surface of the substrate film, the substrate film and the upper core layer are bonded by adhesive film, and the antenna and the amorphous carbon film and the lower core layer are bonded by adhesive film.

[0005] Further, the upper core layer and the lower core layer are foams or honeycomb structures.

[0006] Further, the amorphous carbon film is doped with graphene, and the thickness is 0.1-0.5um.

[0007] Further, the substrate film material is polyimide, polydimethylsiloxane or polyethylene terephthalate, and the thickness of the substrate film is less than 0.5 mm.

[0008] Further, the antenna form is a planar printed antenna, including a microstrip antenna, a planar spiral antenna and a printed metasurface antenna.

[0009] Further, the antenna position adjustment is placed under the lower skin layer.

[0010] Further, the antenna form is a planar printed antenna or a non-planar printed antenna, wherein the planar printed antenna includes a microstrip antenna, a planar spiral antenna and a printed metasurface antenna, and the non-planar printed antenna includes a horn antenna, a waveguide port antenna, a waveguide slot antenna, a Vivaldi antenna, a circumferential antenna and a array antenna.

[0011] Further, the protective skin antenna is not irradiated by high-power microwaves, the amorphous carbon film allows electromagnetic waves to pass through, and the protective skin antenna works normally; when the protective skin antenna is irradiated by high-power microwaves, the amorphous carbon film induces current, which reflects electromagnetic waves, and at the same time, the current induced on the surface of the amorphous carbon film generates heat rapidly, and the heat effect further enhances the conductivity of the amorphous carbon film, thereby increasing the reflection effect of high-power microwaves; when the high-power microwave stops irradiating, the conductivity of the amorphous carbon film disappears, and the protective skin antenna returns to normal work.

[0012] Compared with the prior art, the present application has the following advantages: simple scheme, frequency-independent, can shield high-power microwave signals of any incident frequency, and will not introduce loss in the system link. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is a frequency-independent protective skin printed planar antenna schematic diagram of the present application.

[0014] Figure 2 It is a frequency-independent protective skin non-printed planar antenna schematic diagram of the present application.

[0015] Figure 3 It is a frequency-independent protective skin microstrip antenna schematic diagram of the present application.

[0016] Figure 4 It is a frequency-independent protective skin microstrip antenna schematic diagram of the present application.

[0017] Figure 5 It is a frequency-independent protective skin horn antenna schematic diagram of the present application.

[0018] Figure 6This invention provides a comparison of the gain of a frequency-independent protective skin horn antenna when it is not irradiated by high-power microwaves and when it is irradiated by high-power microwaves. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0020] like Figure 1 As shown, a frequency-independent protective skin antenna, from top to bottom, includes an upper skin, an upper core layer, a substrate thin film, an amorphous carbon film, an antenna, a lower core layer, and a lower skin.

[0021] The upper skin and the upper core layer, and the lower skin and the lower core layer are bonded together by an adhesive film. The amorphous carbon film is deposited on the surface of the substrate film. The substrate film and the upper core layer are bonded together by an adhesive film. The antenna is bonded together with the amorphous carbon film and the lower core layer by an adhesive film.

[0022] The core layer is a foam or honeycomb structure.

[0023] The amorphous carbon film can be doped with graphene and has a thickness of 0.1-0.5 μm.

[0024] The substrate film material is polyimide, or polydimethylsiloxane, or polyethylene terephthalate. The substrate film thickness is less than 0.5 mm.

[0025] The antenna type is a planar printed antenna, including microstrip antennas, planar helical antennas, and printed metasurface antennas.

[0026] Furthermore, such as Figure 2 As shown, the antenna can also be placed in the lower layer of the lower skin. In this case, the antenna type can be either a planar printed antenna or a non-planar printed antenna, including horn antennas, waveguide port antennas, waveguide slot antennas, Vivaldi antennas, circumpolar antennas, and array antennas.

[0027] When the skin antenna is not irradiated by high-power microwaves, the amorphous carbon film allows electromagnetic waves to pass through, and the skin antenna works normally. When the skin antenna is irradiated by high-power microwaves, the amorphous carbon film induces a current, which reflects the electromagnetic waves. At the same time, the current induced on the surface of the amorphous carbon film quickly generates heat, and the thermal effect further enhances the conductivity of the amorphous carbon film, increasing the reflection effect of high-power microwaves. When the high-power microwaves stop irradiating, the conductivity of the amorphous carbon film disappears, and the skin antenna returns to normal operation.

[0028] To verify the effectiveness of the present invention, the following experimental design was conducted.

[0029] Example 1

[0030] As shown in Figure 3 , a frequency-independent protective skin antenna, from top to bottom, comprises an upper skin, a foam, a polyimide film, a graphene-doped amorphous carbon film, a microstrip antenna, a foam, a lower skin.

[0031] The skin and the foam are bonded by adhesive film, the graphene-doped amorphous carbon film is deposited on the surface of the polyimide film, the polyimide film and the foam are bonded by adhesive film, and the microstrip antenna and the graphene-doped amorphous carbon film and the foam are bonded by adhesive film.

[0032] The thickness of the graphene-doped amorphous carbon film is 0.1 um.

[0033] The thickness of the polyimide film is 0.5 mm.

[0034] The designed frequency band of the microstrip antenna is 1.2-1.3 GHz, the size is 120 mm x 120 mm, and the dielectric constant of the printed board is 2.2. The simulated gain when it is irradiated and not irradiated by high-power microwaves is shown in Figure 4 . As can be seen from Figure 4 , when not irradiated, the gain of the antenna at 1.2-1.3 GHz is greater than 7.5 dB, and when irradiated, the gain of the microstrip antenna at 1.2-1.3 GHz is less than -17 dB, and the gain decreases by more than 24.5 dB, indicating that the application can shield high-power microwaves to a certain extent. At the same time, in the frequency band of 0.5-2 GHz, when irradiated, the gain of the antenna is less than -10 dB, indicating that the antenna of the application can realize gain reduction in a wide band, and the frequency dependence is small.

[0035] Example 2

[0036] As shown in Figure 5 , a frequency-independent protective skin antenna, from top to bottom, comprises an upper skin, a foam, a polyimide film, a graphene-doped amorphous carbon film, a foam, a lower skin, and a horn antenna.

[0037] The upper skin and the foam are bonded by adhesive film, the graphene-doped amorphous carbon film is deposited on the surface of the polyimide film, the polyimide film and the foam are bonded by adhesive film, and the lower skin and the foam are bonded by adhesive film. The entire skin covers the radiation port of the horn antenna.

[0038] The thickness of the graphene-doped amorphous carbon film is 0.1 um.

[0039] The thickness of the polyimide film is 0.5 mm.

[0040] The size of the opening of the horn antenna is 33 mm x 40 mm x 43 mm, and the bottom is a 28JS6500 double-ridge waveguide with a length of 20 mm. The simulated gain when it is irradiated and not irradiated by high-power microwaves is shown in Figure 6 . Figure 6It can be seen that when not irradiated, the antenna full-band gain is greater than 8dB, when irradiated, the antenna full-band gain is less than-15dB, the full-band antenna gain drops more than 25dB, indicating that the skin horn antenna has good shielding effect on high power microwave, and the full-band only realizes gain reduction, and the frequency dependence is very small.

[0041] Embodiment 3

[0042] Embodiment 3 is based on embodiment 2, and one or more of the core layer material, amorphous carbon film material and thickness, substrate thin film material and thickness, antenna position and form are adjusted to form a new product.

[0043] The technical features of the above embodiments can be combined arbitrarily, and to make the description concise, all possible combinations of the technical features in the above embodiments are not described, however, as long as the combination of the technical features does not exist contradictory, it should be considered as the scope of the present application.

[0044] The above embodiments only express several implementation manners of the present application, the description is more specific and detailed, but it should not be understood as a limitation on the scope of the present application. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, several modifications and improvements can be made, which all belong to the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.

Claims

1. A frequency independent radome antenna, characterized by, From top to bottom, including the upper skin, the upper core layer, the substrate film, the amorphous carbon film, the antenna, the lower core layer, the lower skin, the upper skin and the upper core layer are bonded by adhesive film, the lower skin and the lower core layer are bonded by adhesive film, the amorphous carbon film is deposited on the surface of the substrate film, the substrate film and the upper core layer are bonded by adhesive film, the antenna and the amorphous carbon film, the lower core layer are bonded by adhesive film; The protective skin antenna is not irradiated by high-power microwave, the amorphous carbon film allows electromagnetic waves to pass through, and the protective skin antenna works normally; when the protective skin antenna is irradiated by high-power microwave, the amorphous carbon film induces current, which reflects electromagnetic waves, at the same time, the current induced on the surface of the amorphous carbon film generates heat rapidly, and the heat effect further enhances the conductivity of the amorphous carbon film, which increases the reflection effect of high-power microwave; when the high-power microwave stops irradiating, the conductivity of the amorphous carbon film disappears, and the protective skin antenna returns to normal work.

2. A frequency independent radome antenna according to claim 1, characterized in that The upper core layer and the lower core layer are foam or honeycomb structure.

3. A frequency independent radome antenna according to claim 1, wherein, The amorphous carbon film is doped with graphene, and the thickness is 0.1-0.5um.

4. A frequency independent radome antenna according to claim 1, wherein, The substrate film material is polyimide, polydimethylsiloxane or polyethylene terephthalate, and the thickness of the substrate film is less than 0.5mm.

5. A frequency independent radome antenna according to claim 1, wherein, The antenna is a planar printed antenna, including microstrip antenna, planar spiral antenna and printed metasurface antenna.

6. A frequency independent radome antenna according to claim 1, wherein, The antenna is placed under the lower skin.

7. A frequency independent radome antenna according to claim 6, characterised in that, The antenna is a planar printed antenna or a non-planar printed antenna, wherein the planar printed antenna includes microstrip antenna, planar spiral antenna and printed metasurface antenna, and the non-planar printed antenna includes horn antenna, waveguide port antenna, waveguide slot antenna, Vivaldi antenna, circumferential antenna and array antenna.

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