Frequency-independent protective skin antenna

Abstract

The invention discloses a frequency-independent protective skin antenna which comprises an upper skin, an upper core layer, a substrate film, an amorphous carbon film, an antenna, a lower core layer and a lower skin from top to bottom. 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 current and generates a reflection effect on electromagnetic waves, meanwhile, the current inducted on the surface of the amorphous carbon film rapidly generates heat, the conductivity of the amorphous carbon film is further enhanced through the heat effect, and reflection on the high-power microwaves is improved; and when the high-power microwave stops irradiation, the conductivity of the amorphous carbon film disappears, and the skin antenna recovers to work normally. Compared with the prior art, the scheme is simple and free of frequency dependence, high-power microwave signals of any incident frequency can be shielded, extra loss is not introduced into a system link, and the method has great value in the field of high-power microwave protection.

Description

Technical Field

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

[0002] With the maturity of high-power microwave weapon technology, electronic equipment on various platforms are facing unprecedented threats of high-power microwave irradiation. Antenna coupling is the main way for high-power microwaves to enter the RF front end of electronic equipment. Therefore, preventing high-power microwaves from entering the RF 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 include limiting antennas and energy selective antenna covers. The limiting antenna loads a switch on the antenna radiation structure, and changes the antenna radiation structure by exciting the on and off of the switch through high-power microwaves, thereby achieving attenuation of the incident high-power microwave signal. The energy selective antenna cover integrates the frequency selective surface FSS and the switch inside the traditional antenna cover, and realizes the change of the FSS frequency response by exciting the on and off of the switch through high-power microwaves, thereby achieving selective passage of the incident high-power microwave signal. In the above two methods, when the incident microwave signal is small, the microwave signal can enter the electronic equipment normally, and when the incident microwave signal reaches the on-off threshold field strength of the switch, both can achieve attenuation of the incident high-power microwave signal. The above effect is achieved because after the switch is excited by the high-power microwave signal, the limiting antenna and the energy selection antenna cover realize the change of the operating frequency, that is, from the original operating frequency to the new operating frequency. If the incident signal falls within the original operating frequency band, the operating frequency of the limiting antenna and the energy selection antenna cover changes to another frequency, and the current incident frequency signal is attenuated. However, when the incident high-power microwave signal happens to be the new operating frequency, the switch is still turned on. At this time, the high-power microwave signal can still enter the RF front end of the electronic equipment, and there is still a risk of damaging the electronic equipment. Summary of the invention

[0003] The purpose of the present invention is to provide a frequency-independent protective skin antenna to solve the frequency dependence problem of high-power microwave protection of the skin antenna.

[0004] The technical solution to achieve the purpose of the present invention is: a frequency-independent protective skin antenna, which includes, 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. The upper skin and the upper core layer, and the lower skin and the lower core layer are bonded 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 by an adhesive film, and the antenna and the amorphous carbon film and the lower core layer are bonded by an adhesive film.

[0005] Furthermore, the upper core layer and the lower core layer are foam or honeycomb structures.

[0006] Furthermore, the amorphous carbon film is doped with graphene and has a thickness of 0.1-0.5 um.

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

[0008] Furthermore, the antenna is in the form of a planar printed antenna, including a microstrip antenna, a planar spiral antenna and a printed supersurface antenna.

[0009] Furthermore, the position of the antenna is adjusted to be placed in the lower layer of the lower skin.

[0010] Furthermore, the antenna is in the form of 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 mouth antenna, a waveguide slot antenna, a Vivaldi antenna, a circumferential antenna and an array antenna.

[0011] Furthermore, when 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 operates normally; when the protective skin antenna is irradiated by high-power microwaves, the amorphous carbon film induces current, which produces a reflection effect on 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, thereby increasing the reflection effect on high-power microwaves; when the high-power microwaves stop irradiating, the conductivity of the amorphous carbon film disappears, and the protective skin antenna resumes normal operation.

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

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

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

[0015] Figure 3 The present invention is a schematic diagram of a frequency-independent protective skin microstrip antenna.

[0016] Figure 4 The present invention provides a comparison of the skin antenna gain of a frequency-independent protective skin microstrip antenna when it is not irradiated with high-power microwaves and when it is irradiated with high-power microwaves.

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

[0018] Figure 6The present invention provides a comparison of the skin antenna gain of a frequency-independent protective skin horn antenna when it is not irradiated with high-power microwaves and when it is irradiated with high-power microwaves. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0020] like Figure 1 As shown, a frequency-independent protective skin antenna 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.

[0021] The upper skin and upper core layer, the lower skin and 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.

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

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

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

[0025] The antenna is in the form of a planar printed antenna, including a microstrip antenna, a planar spiral antenna, a printed supersurface antenna, etc.

[0026] Further, if Figure 2 As shown, the antenna can also be placed in the lower layer of the lower skin. In this case, the antenna can be a planar printed antenna or a non-planar printed antenna, including a horn antenna, a waveguide mouth antenna, a waveguide slot antenna, a Vivaldi antenna, a circumferential antenna, an array antenna, etc.

[0027] 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 current, which produces a reflection effect on 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, thereby increasing the reflection effect on high-power microwaves; when the high-power microwaves stop irradiating, the conductivity of the amorphous carbon film disappears, and the skin antenna resumes normal operation.

[0028] In order to verify the effectiveness of the scheme of the present invention, the following experimental design was carried out.

[0029] Example 1

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

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

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

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

[0034] The design frequency band of the microstrip antenna is 1.2-1.3GHz, the size is 120mm×120mm, and the dielectric constant of the printed circuit board is 2.2. The simulated gain when it is irradiated with and without high-power microwaves is as follows: Figure 4 As shown. Figure 4 It can be seen that when not irradiated, the gain of the antenna is greater than 7.5dB at 1.2-1.3GHz, and when irradiated, the gain of the microstrip antenna is less than -17dB at 1.2-1.3GHz, and the gain decreases by more than 24.5dB, indicating that the present invention can provide limited shielding for high-power microwaves. At the same time, in the 0.5-2GHz frequency band, the antenna gain is less than -10dB when irradiated, indicating that the antenna of the present invention can achieve gain decrease in a wide band and has little frequency dependence.

[0035] Example 2

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

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

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

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

[0040] The opening size of the horn antenna is 33mm×40mm×43mm, and the bottom is a 28JS6500 double-ridge waveguide with a length of 20mm. The simulated gain when it is irradiated with and without high-power microwaves is as follows Figure 6 shown. Figure 6It can be seen that when not irradiated, the antenna's full-band gain is greater than 8dB, and when irradiated, the antenna's full-band gain is less than -15dB. The full-band antenna gain drops by more than 25dB, indicating that the skin horn antenna has a good shielding effect on high-power microwaves, and only achieves a gain decrease in the entire frequency band, with very little dependence on frequency.

[0041] Example 3

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

[0043] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0044] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A frequency-independent protective skin antenna, characterized in that: From top to bottom, it includes an upper skin, an upper core layer, a substrate film, an amorphous carbon film, an antenna, a lower core layer, and a lower skin. The upper skin and the upper core layer, as well as 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.

2. A frequency-independent protective skin antenna according to claim 1, characterized in that: The upper core layer and the lower core layer are foam or honeycomb structures.

3. A frequency-independent protective skin antenna according to claim 1, characterized in that: The amorphous carbon film is doped with graphene and has a thickness of 0.1-0.5 um.

4. A frequency-independent protective skin antenna according to claim 1, characterized in that: The substrate film material is polyimide, polydimethylsiloxane or polyethylene terephthalate, and the thickness of the substrate film is less than 0.5 mm.

5. A frequency-independent protective skin antenna according to claim 1, characterized in that: The antenna is in the form of a planar printed antenna, including a microstrip antenna, a planar spiral antenna and a printed supersurface antenna.

6. A frequency-independent protective skin antenna according to claim 1, characterized in that: The antenna position is adjusted to be placed in the lower layer of the lower skin.

7. A frequency-independent protective skin antenna according to claim 6, characterized in that: The antenna type is a planar printed antenna or a non-planar printed antenna. The planar printed antenna includes a microstrip antenna, a planar spiral antenna and a printed metasurface antenna. The non-planar printed antenna includes a horn antenna, a waveguide mouth antenna, a waveguide slot antenna, a Vivaldi antenna, a circumferential antenna and an array antenna.

8. A frequency-independent protective skin antenna according to any one of claims 1 to 7, characterized in that: 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 produces a reflection effect on 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, thereby increasing the reflection effect on high-power microwaves; when the high-power microwaves stop irradiating, the conductivity of the amorphous carbon film disappears, and the protective skin antenna resumes normal operation.

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