Electromagnetic induction heating metamaterial device and aircraft

Abstract

This invention proposes an electromagnetic induction heating metamaterial device, comprising an impedance matching device, a first coil, and a skin, wherein the electromagnetic metamaterial is disposed on the skin. The electromagnetic metamaterial includes a plurality of second coils, all disposed around the first coil and without contact with it. The first coil is used to receive the output power of a radio frequency power supply through the impedance matching device and generate an alternating electromagnetic field; the impedance matching device is used to achieve impedance matching between the radio frequency power supply and the first coil. Each of the plurality of second coils is used to generate an induced alternating current in the alternating electromagnetic field, generating heat to raise the temperature of the electromagnetic metamaterial. This invention also proposes an aircraft. Thus, this electromagnetic induction heating metamaterial device can heat the material through electromagnetic induction without generating a large radar cross-section.

Description

Technical Field

[0001] This invention relates to the field of metamaterials, and more specifically, to an electromagnetic induction heating metamaterial device and an aircraft. Background Technology

[0002] Aircraft flying at high altitudes face the challenges of low temperatures and high humidity. Windward-facing areas of the fuselage, such as the windshield, tail fin leading edge, propeller, and engine air intakes, are prone to icing. Icing increases the aircraft's weight and negatively impacts its aerodynamic performance, increasing drag, reducing lift, and increasing stall speed, significantly reducing the aircraft's safety margin. Icing not only deteriorates aerodynamics but also reduces engine power, causes inaccurate instrument readings, and obstructs windshield visibility, greatly increasing the risk of accidents.

[0003] On the other hand, surface ice can also affect the reflection of electromagnetic waves, thereby increasing the overall radar cross section (RCS) of the aircraft and impacting its survivability. Radar cross section (RCS) is a physical quantity that measures a target's ability to reflect radar waves, measured in square meters (m²). For ease of comparison, it is usually converted to logarithmic form (dBsm). A smaller RCS means that the target reflects fewer detection radar waves, making it less likely to be detected and thus increasing its survivability.

[0004] Therefore, icing is an issue that cannot be ignored during flight, and aircraft must be equipped with de-icing systems to remove the ice layer from the fuselage surface.

[0005] Currently, the most widely used system is the electric heating anti-icing system. This involves installing heating wires or films in key areas of the aircraft (such as the leading edge of the propeller and the windshield). When powered on, the heating elements generate heat, raising the surface temperature of the fuselage and preventing or melting ice. While this technology achieves uniform heating, the heating elements and their power supply metal plates cause significant electromagnetic scattering, increasing the aircraft's radar cross-section and severely impacting its performance. A schematic diagram of the power supply metal plate structure in an electric heating anti-icing system is provided for example. Figure 1 As shown, it is a rectangular metal sheet. When an electromagnetic wave with a frequency of 1 GHz passes through it... Figure 1 The simulation results of the radar cross section of the vertically incident power supply metal sheet on the left side under different polarizations are as follows: Figure 2 As shown. From Figure 2As can be seen, comparing HH polarization and VV polarization, within an incident angle range of ±30°, the radar cross section (RCS) value of HH polarization (-15.69 dBsm) is approximately 47 dB higher than that of VV polarization (-72.33 dBsm). The radar cross section value is then converted from dB to m. 2 The radar cross section value for HH polarization can be obtained as 0.027m. 2 The radar cross section of VV polarization is 5.8 * 10^(-8) m. 2 The radar cross-sections of the two differ by approximately 460,000 times. Therefore, the power supply metal sheet will result in a large radar cross-section when subjected to HH polarization incident light, which is a significant defect. Summary of the Invention

[0006] This invention proposes an electromagnetic induction heating metamaterial device and aircraft, which at least solves the technical problem of how to achieve heating without generating a large radar cross-section.

[0007] The present invention proposes an electromagnetic induction heating metamaterial device, which includes an impedance matching device, a first coil and a skin, wherein the electromagnetic metamaterial is disposed on the skin; the electromagnetic metamaterial includes a plurality of second coils, all of which are disposed around the first coil and are not in contact with the first coil. The first coil is used to receive the output power of the radio frequency power supply through an impedance matching device and generate an alternating electromagnetic field; the impedance matching device is used to achieve impedance matching between the radio frequency power supply and the first coil. Each of the plurality of second coils is used to generate an induced alternating current in the alternating electromagnetic field and to generate heat that causes the electromagnetic metamaterial to heat up.

[0008] Preferably, the RF power supply and the impedance matching device are connected by a wire, and the impedance matching device and the first coil are also connected by a wire.

[0009] Preferably, the first coil is in the shape of a ring, and all of the plurality of second coils are in the shape of rings; or The first coil is in the shape of a square ring, and the plurality of second coils are also in the shape of square rings.

[0010] Preferably, the plurality of second coils are identical, and the size of each second coil is smaller than the size of the first coil.

[0011] Preferably, the first coil is made of copper, and the plurality of second coils are all made of ferromagnetic materials, aluminum, or copper.

[0012] Preferably, the skin is in the shape of an inverted V, and the plurality of second coils are respectively disposed on both sides of the skin; the first coil is disposed at the bottom opening of the inverted V-shaped skin, and the first coil is not in contact with the skin.

[0013] Preferably, the distance between at least one second coil located on the lower left side of the skin and the first coil is the minimum distance, and the distance between at least one second coil located on the lower right side of the skin and the first coil is also the minimum distance, corresponding to the highest temperature rise generated by the electromagnetic metamaterial at the lower left and lower right sides of the skin. The distance between at least one second coil located on the left middle side of the skin and the first coil is the middle distance, and the distance between at least one second coil located on the right middle side of the skin and the first coil is also the middle distance, corresponding to the electromagnetic metamaterial at the left middle side and the right middle side of the skin generating a moderate temperature rise; The distance between at least one of the second coils located in the middle of the skin and the first coil is the maximum distance, corresponding to the lowest temperature rise generated by the electromagnetic metamaterial in the middle of the skin.

[0014] Preferably, the temperature generated by the electromagnetic metamaterial increases as the distance between at least one second coil and the first coil of the electromagnetic metamaterial decreases.

[0015] Preferably, the different temperatures of the electromagnetic metamaterial are achieved by adjusting at least one of the peak value of the alternating current and the distance between at least one second coil and the first coil of the electromagnetic metamaterial.

[0016] Preferably, the impedance matching device is used to adjust the impedance of the first coil to... Approximate to or equal to The conjugate complex of the source impedance of an RF power supply.

[0017] Preferably, the impedance matching device includes one or more adjustable inductors and / or adjustable capacitors, which are used to adjust the impedance of the first coil to a suitable level by adjusting the inductance value of the adjustable inductor and / or the capacitance value of the adjustable capacitor. Approximate to or equal to The conjugate complex of the source impedance of an RF power supply.

[0018] In another aspect, the present invention proposes an aircraft including the electromagnetic induction heating metamaterial device described above, the electromagnetic induction heating metamaterial device including the radio frequency power supply, and the electromagnetic induction heating metamaterial device being disposed inside the fuselage of the aircraft.

[0019] The beneficial effects of this invention are as follows: The electromagnetic induction heating metamaterial device described in this invention can heat the material through electromagnetic induction without generating a large radar cross-section.

[0020] This invention uses electromagnetic induction heating to de-ice the electromagnetic metamaterial in the icing area of ​​the fuselage. The electromagnetic induction heating metamaterial device (which includes a radio frequency power supply, an impedance matching device, a first coil, and the electromagnetic metamaterial) is located inside the fuselage of the aircraft and has no contact with the structure on the surface of the fuselage. There is no power supply metal sheet in the existing electric heating anti-icing system, so it does not increase the radar cross-section of the aircraft.

[0021] This invention innovatively utilizes the eddy current effect of electromagnetic metamaterials on the fuselage surface that can reduce the radar cross-section, achieving a heating effect without adding any additional changes to the fuselage de-icing area. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the power supply metal sheet in an existing electric heating anti-icing system.

[0024] Figure 2 yes Figure 1 The radar cross-section of the power supply metal sheet of the electrically heated anti-icing system shown.

[0025] Figure 3 This is a schematic diagram of an electromagnetic induction heating metamaterial device according to an embodiment of the present invention.

[0026] Figure 4 yes Figure 3 The image shows a simulation of the temperature rise of the electromagnetic induction heating metamaterial device.

[0027] Figure 5 An actual product drawing of the electromagnetic induction heating metamaterial device according to an embodiment of the present invention.

[0028] Figure 6 A specific circuit diagram of the impedance matching device according to an embodiment of the present invention. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention are within the scope of protection of the present invention.

[0030] In response to the problem that traditional electric heating anti-icing systems in existing technologies result in a large radar cross-section for the entire aircraft, this invention proposes an electromagnetic induction heating metamaterial device to solve the problem of surface icing affecting the overall performance of aircraft during high-altitude flight.

[0031] Metamaterials technology is a technique that uses the arrangement of artificial microstructures to control the amplitude, phase, and polarization of electromagnetic waves. Currently, metamaterials have been successfully applied to the fuselages of aircraft to reduce their radar cross-section.

[0032] The electromagnetic induction heating metamaterial device of this invention is based on the principle of electromagnetic induction heating. It generates an alternating electromagnetic field in the de-icing area of ​​an aircraft and utilizes the eddy current effect of the metamaterial on the surface of the aircraft fuselage in the alternating electromagnetic field to raise the temperature of the metamaterial. The temperature of the fuselage surface is then raised through heat conduction, thereby achieving the de-icing effect.

[0033] Obviously, heating by electromagnetic induction eliminates the need for the power supply metal plate (such as those used in traditional electric heating anti-icing systems) found in existing technologies. Figure 1 As shown in the figure, there is no problem of causing a large radar cross-section of the whole machine. It can achieve the de-icing effect without generating a large radar cross-section, thus avoiding damage to the performance of the whole machine.

[0034] like Figure 3 As shown, the electromagnetic induction heating metamaterial device 100 according to an embodiment of the present invention includes a first coil 10, an impedance matching device 30, and a skin 40 (see [link to documentation]). Figure 5 Electromagnetic metamaterial 50 is provided on the skin 40.

[0035] The first coil 10 is used to receive the output power of the radio frequency power supply 900 through the impedance matching device 30 and generate an alternating electromagnetic field.

[0036] Impedance matching device 30 is used to achieve impedance matching between RF power supply 900 and first coil 10.

[0037] like Figure 4 As shown, the electromagnetic metamaterial 50 includes a plurality of second coils 54, all of which are disposed around the first coil 10 and are not in contact with the first coil 10. In this embodiment, the distance between the plurality of second coils 54 and the first coil 10 is less than 300 mm to ensure the heating effect.

[0038] Specifically, such as Figure 5 As shown, multiple second coils 54 are arranged in an array on the skin 40.

[0039] By way of non-limiting illustration, the plurality of second coils 54 are all located on one side of the first coil 10. Specifically, in this embodiment, with Figure 4 The example shown illustrates a single row or column with six second coils 54, which is not a limitation. The two second coils 54 on the left and the two second coils 54 on the right are relatively close to the first coil 10, while the two second coils 54 in the middle are relatively far from the first coil 10. In other embodiments, the number of second coils 54 in a single row or column can be four, five, seven, or eight or more.

[0040] Each of the plurality of second coils 54 is used to generate an induced alternating current in the alternating electromagnetic field generated by the first coil 10, and to generate heat to heat up the electromagnetic metamaterial 50.

[0041] It should be noted that, specifically, the distance between at least one second coil 54 located on the lower left side of the skin and the first coil 10 is the minimum distance, and the distance between at least one second coil 54 located on the lower right side of the skin and the first coil 10 is also the minimum distance, corresponding to the highest temperature rise generated by the electromagnetic metamaterials on the lower left and lower right sides of the skin. Each second coil 54 can also be defined as an electromagnetic metamaterial.

[0042] The distance between at least one second coil 54 located on the left middle side of the skin and the first coil 10 is a medium distance, and the distance between at least one second coil 54 located on the right middle side of the skin and the first coil 10 is also a medium distance, corresponding to the electromagnetic metamaterial at the left middle side and the right middle side of the skin generating a moderate temperature rise.

[0043] The distance between at least one second coil 54 located in the middle of the skin and the first coil 10 is the maximum distance, corresponding to the lowest temperature rise generated by the electromagnetic metamaterial in the middle of the skin.

[0044] For more details, please refer to Figure 4 As a non-limiting explanation, the distance between the two middle second coils 54 and the first coil 10 is the maximum distance, corresponding to the electromagnetic metamaterial at the middle position achieving a heating effect of approximately 284K (that is, the greater the distance, the smaller the induced current generated by the second coil 54, and the lower the heating effect of the electromagnetic metamaterial at the middle position).

[0045] The distance between the second coil 54 on the left center side and the first coil 10 is the middle distance, and the distance between the second coil 54 on the right center side and the first coil 10 is also the middle distance, corresponding to the electromagnetic metamaterials on the left center side and the right center side achieving a heating effect of approximately 338K (i.e., a moderate heating effect).

[0046] The distance between the second coil 54 on the lower left and the first coil 10 is the minimum distance, and the distance between the second coil 54 on the lower right and the first coil 10 is also the minimum distance. This corresponds to the electromagnetic metamaterials on the lower left and lower right sides achieving a heating effect of approximately 393K (that is, the smaller the distance, the greater the induced current generated by the second coil 54, corresponding to the highest heating effect generated by the electromagnetic metamaterials on the lower left and lower right sides).

[0047] The present invention sets the distance between multiple second coils 54 and the first coil 10 as the maximum distance, the middle distance, and the minimum distance, in order to verify the different heating effects of the electromagnetic metamaterial 50 at different distances.

[0048] Optionally, in other embodiments, the electromagnetic induction heating metamaterial device 100 includes a first coil 10, an impedance matching device 30, a skin 40, and a radio frequency power supply 900, with an electromagnetic metamaterial 50 disposed on the skin 40.

[0049] In this embodiment, the RF power supply 900 and the impedance matching device 30 are connected by wires, and the impedance matching device 30 and the first coil 10 are also connected by wires.

[0050] Specifically, in Figure 4 In this configuration, the first coil 10 is circular, and the multiple second coils 54 are also circular; or the first coil 10 is square, and the multiple second coils 54 are also square; or the first coil 10 is elliptical, and the multiple second coils 54 are also elliptical. The circular structure of both the first coil 10 and the second coil 54 ensures minimal current loss and optimal heating of the electromagnetic metamaterial 50.

[0051] Multiple second coils 54 are identical, and the size of each second coil 54 is smaller than the size of the first coil 10.

[0052] The first coil 10 is made of copper; compared with ferromagnetic materials or aluminum, copper has lower losses. Multiple second coils 54 are all made of ferromagnetic materials, aluminum, or copper.

[0053] Specifically, Figure 5 The skin 40 shown is in the shape of an inverted V, with multiple second coils 54 respectively disposed on both sides of the skin 40. Specifically, with Figure 4 The number of the multiple second coils 54 in a single row or column shown is six as an example without limitation, wherein three of the second coils 54 are located on one side of the skin 40 and the other three are located on the other side of the skin 40.

[0054] The first coil 10 is positioned at the bottom opening of the inverted V-shaped skin 40, with no contact between the first coil 10 and the skin 40. Similarly, the multiple second coils 54 also have no contact with the first coil 10. When the skin 40 is shaped like an inverted V: the distances between the two second coils 54 located on the lower left and lower right sides of the skin and the first coil 10 are at their minimum; the distances between the two second coils 54 located on the middle left and middle right sides of the skin and the first coil 10 are at their middle distances; and the distances between the two second coils 54 located in the middle of the skin and the first coil 10 are at their maximum distances. This allows for verification of the different heating effects of the electromagnetic metamaterial 50 at different distances.

[0055] In other alternative embodiments, the skin 40 may also be in the shape of an inverted U, etc.

[0056] In this embodiment, the temperature generated by the electromagnetic metamaterial 50 increases as the distance between at least one second coil 54 of the electromagnetic metamaterial 50 and the first coil 10 decreases.

[0057] In this embodiment, different temperature increases of the electromagnetic metamaterial 50 are achieved by adjusting at least one of the peak value of the alternating current and the distance between at least one second coil 54 of the electromagnetic metamaterial 50 and the first coil 10.

[0058] In this embodiment, the impedance matching device 30 is used to adjust the impedance of the first coil 10 to approximately or equal to the conjugate complex number of the source impedance of the RF power supply 900.

[0059] Specifically, the impedance matching device 30 includes one or more adjustable inductors and / or adjustable capacitors. The impedance matching device 30 is used to adjust the impedance of the first coil to approximately or equal to the conjugate complex number of the source impedance of the RF power supply by adjusting the inductance value of the adjustable inductor and / or the capacitance value of the adjustable capacitor.

[0060] As a limited example, Figure 6 This is a detailed circuit diagram of the impedance matching device 30 according to an embodiment of the present invention. Figure 6 As shown, the impedance matching device 30 includes a controller 32, an inductor L and an adjustable capacitor C. The adjustable capacitor C and the inductor L are connected in series to the positive output terminal of the RF power supply 900 and one end of the first coil 10. The other end of the first coil 10 is connected to the negative output terminal of the RF power supply 900.

[0061] The RF power supply 900 has a directional coupler used to detect the output power and reflected power of the RF power supply 900. For example, when the output power and reflected power of the RF power supply 900 are 300W and 0W respectively, it means that the RF power supply 900 has output all its power, with no reflection, and the power efficiency is at its highest.

[0062] The controller 32 is used to adjust the capacitance value of the adjustable capacitor C according to the reflected power signal to adjust the impedance of the first coil 10 to approximately or equal to the conjugate complex number of the source impedance of the RF power supply 900.

[0063] The working principle is as follows: like Figure 3 As shown, the output power generated by the RF power supply 900 is supplied to the first coil 10 through the impedance matching device 30. The impedance matching device 30 is used to achieve impedance matching between the RF power supply 900 and the first coil 10, thereby achieving near-reflection-free power output. The terminals on the impedance matching device 30 are connected to the first coil 10, thereby energizing the first coil 10. The alternating current on the first coil 10 will generate an alternating electromagnetic field around the first coil 10. The electromagnetic metamaterial 50, located in the alternating electromagnetic field, will generate an induced electromotive force due to its conductivity when placed in a changing magnetic field, thereby generating an induced current (eddy current effect). The induced current circulates in the electromagnetic metamaterial 50. Since the electromagnetic metamaterial 50 has a certain resistance, according to Joule's law, heat will be generated, causing the electromagnetic metamaterial 50 to heat up, thus achieving heating.

[0064] The specific effects of induction heating are as follows: Figure 4 As shown, an alternating current is generated using an RF power supply 900, and the alternating current flows through the first coil 10 ( Figure 4 The large circular ring at the bottom center), the first coil 10 and the electromagnetic metamaterial 50 ( Figure 4 The six small rings 54 in the design are non-contact, and the spacing between them is controlled. The initial temperature is 263K (i.e., -10℃), and after a 1-second heating time, the electromagnetic metamaterial 50 achieves a heating effect ranging from 11℃ (i.e., 284K) to 120℃ (i.e., 393K) at different distances. Figure 4 It can be seen that the electromagnetic metamaterial 50 is not in contact with the first coil 10, and the temperature at the electromagnetic metamaterial 50 is significantly higher than the temperature near the electromagnetic metamaterial 50, proving that the heating of the electromagnetic metamaterial 50 is achieved by the principle of electromagnetic induction heating.

[0065] In this embodiment, the maximum temperature limit (i.e., the maximum temperature rise limit) of the electromagnetic metamaterial 50 is 200°C to prevent the electromagnetic metamaterial 50 from being damaged due to continuous temperature rise.

[0066] The maximum temperature of the electromagnetic metamaterial 50 can be limited to 200°C by controlling the output power of the radio frequency power supply 900, or by controlling the distance between at least one second coil 54 and the first coil 10.

[0067] This invention is primarily based on the principle that electromagnetic metamaterials can achieve heating and thus de-icing through the eddy current effect in alternating electromagnetic fields. In principle, Figure 3 and Figure 4 This only illustrates the heating effect of an electromagnetic metamaterial etched with copper (i.e., multiple second coils are all made of copper) under an alternating current at a certain frequency, and therefore should not be construed as a limitation on this invention patent.

[0068] This invention, by designing electromagnetic metamaterials with different material substrates and utilizing the eddy current effect of different materials (such as ferromagnetic materials, aluminum, copper, etc.) to achieve heating, should be considered within the scope of protection of this invention patent.

[0069] The present invention achieves different heating effects by adjusting the magnitude of the alternating current peak or the distance between at least one second coil and the first coil of the electromagnetic metamaterial, which should also be considered within the scope of protection of the present invention patent.

[0070] The specific application described in the embodiments of this invention is de-icing, but this should not be construed as a limitation on the application of this invention. Related applications of heating electromagnetic metamaterials using the principle of electromagnetic induction should also be considered within the scope of protection of this invention.

[0071] Furthermore, any modifications and improvements made without departing from the concept of this invention are also within the scope of protection of this invention.

[0072] The system for heating metamaterials using electromagnetic induction proposed in this invention is an active energy non-conservation system. Here, we only illustrate how the electromagnetic metamaterials are heated by the energy of an external electromagnetic field, thereby achieving the de-icing effect on the aircraft fuselage.

[0073] This invention also proposes an aircraft including the electromagnetic induction heating metamaterial device, the electromagnetic induction heating metamaterial device including the radio frequency power supply, and the electromagnetic induction heating metamaterial device being disposed inside the fuselage of the aircraft.

[0074] The key point of this invention is that it uses electromagnetic induction heating to heat up and de-ice the electromagnetic metamaterial in the icing area of ​​the fuselage. The electromagnetic induction heating metamaterial device (which includes a radio frequency power supply, an impedance matching device, a first coil, and electromagnetic metamaterial) is located inside the fuselage of the aircraft and has no contact with the structure on the surface of the fuselage. There is no power supply metal sheet in the existing electric heating anti-icing system, so it does not increase the radar cross-section of the aircraft.

[0075] It is important to note that the reason why the electromagnetic induction heating metamaterial device described in this invention does not produce a large radar cross-section is: First, Figure 4The multiple second coils 54 shown in a circular shape are made of a metamaterial with a wave-transparent structure, thus reducing the radar cross-section; secondly, the electromagnetic induction heating metamaterial device of the present invention does not... Figure 1 The power supply metal sheet of the existing electrically heated anti-icing system shown does not increase the radar cross-section.

[0076] This invention innovatively utilizes the eddy current effect of electromagnetic metamaterials on the fuselage surface that can reduce the radar cross-section, achieving a heating effect without adding any additional changes to the fuselage de-icing area.

[0077] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An electromagnetic induction heating metamaterial device, characterized by, It includes an impedance matching device, a first coil, and a skin, on which an electromagnetic metamaterial is disposed; the electromagnetic metamaterial includes a plurality of second coils, all of which are disposed around the first coil and are not in contact with the first coil. The first coil is used to receive the output power of the radio frequency power supply through an impedance matching device and generate an alternating electromagnetic field; the impedance matching device is used to achieve impedance matching between the radio frequency power supply and the first coil. Each of the plurality of second coils is used to generate an induced alternating current in the alternating electromagnetic field and to generate heat that causes the electromagnetic metamaterial to heat up.

2. The apparatus of claim 1, wherein, The first coil is in the shape of a ring, and all of the plurality of second coils are in the shape of rings; or The first coil is in the shape of a square ring, and the plurality of second coils are also in the shape of square rings.

3. The apparatus according to claim 1, characterized in that, The plurality of second coils are identical, and the size of each second coil is smaller than that of the first coil.

4. The apparatus according to claim 1, characterized in that, The first coil is made of copper, and the plurality of second coils are all made of ferromagnetic materials, aluminum, or copper.

5. The apparatus according to claim 1, characterized in that, The skin is shaped like an inverted V, and the plurality of second coils are respectively disposed on both sides of the skin; the first coil is disposed at the bottom opening of the inverted V-shaped skin, and the first coil is not in contact with the skin.

6. The apparatus according to claim 1 or 5, characterized in that, The distance between at least one second coil located on the lower left side of the skin and the first coil is the minimum distance, and the distance between at least one second coil located on the lower right side of the skin and the first coil is also the minimum distance, corresponding to the highest temperature rise generated by the electromagnetic metamaterial at the lower left and lower right sides of the skin; The distance between at least one second coil located on the left middle side of the skin and the first coil is the middle distance, and the distance between at least one second coil located on the right middle side of the skin and the first coil is also the middle distance, corresponding to the electromagnetic metamaterial at the left middle side and the right middle side of the skin generating a moderate temperature rise; The distance between at least one of the second coils located in the middle of the skin and the first coil is the maximum distance, corresponding to the lowest temperature rise generated by the electromagnetic metamaterial in the middle of the skin.

7. The apparatus according to claim 1, characterized in that, Different temperature increases of the electromagnetic metamaterial are achieved by adjusting at least one of the peak value of the alternating current and the distance between at least one second coil and the first coil of the electromagnetic metamaterial.

8. The apparatus according to claim 1, characterized in that, The impedance matching device is used to adjust the impedance of the first coil to... Approximate to or equal to The conjugate complex of the source impedance of an RF power supply.

9. The apparatus according to claim 8, characterized in that, The impedance matching device includes one or more adjustable inductors and / or adjustable capacitors, and is used to adjust the impedance of the first coil to a specified value by adjusting the inductance value of the adjustable inductor and / or the capacitance value of the adjustable capacitor. Approximate to or equal to The conjugate complex of the source impedance of an RF power supply.

10. An aircraft comprising an electromagnetic induction heating metamaterial device as described in any one of claims 1 to 9, wherein the electromagnetic induction heating metamaterial device includes the radio frequency power supply, and the electromagnetic induction heating metamaterial device is disposed inside the fuselage of the aircraft.

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