Blackout communication method and system based on gain metamaterial

Abstract

The invention discloses a blackout communication method and system based on gain metamaterials, an aircraft communication component and a communication method. In order to overcome many limitations of an existing blackout relieving communication method, including the problems of sacrifice of aerodynamic performance and flight load of an aircraft, atmospheric rain attenuation, weak collision environment restriction, communication equipment development and the like, the method comprises the following steps: simulating and generating a plasma-gain metamaterial matching system; taking a corresponding incident electromagnetic wave frequency when the matching system is balanced and stable as a communication signal frequency; the balance and stability of the matching system are in a state that the gain and loss of the matching system are balanced and a characteristic value curve is closed; when the entity gain metamaterial layer and the plasma layer at the blackout position form the structure of the matching system, communication is carried out through a communication signal conforming to the communication signal frequency; and the entity gain metamaterial layer and the analog gain metamaterial layer have the same thickness and dielectric constant.

Description

Technical Field

[0001] The invention relates to an aircraft communication component and a communication method. Background Art

[0002] When various high-speed aircraft fly in near-space at hypersonic speeds (usually 10-25 Mach), the gas around the aircraft will be compressed and heated by the hypersonic shock wave, and the friction between the air molecules and the surface of the aircraft will cause violent thermal motion and be decomposed and ionized, forming a plasma sheath that wraps the aircraft. The high-density, strong-collision, and high-dynamic plasma sheath will attenuate and shield communication signals, causing signal amplitude attenuation and phase distortion, thereby causing the interruption of radio signals such as navigation, data transmission, telemetry, and remote control, which is the blackout phenomenon. The communication interruption problem caused by the existence of the plasma sheath has seriously affected and restricted the rapid development of manned spaceflight, deep space exploration, military equipment, and future space-to-earth shuttles. The blackout problem is a technical problem and challenge that needs to be solved urgently.

[0003] At present, the methods for alleviating communication blackouts at home and abroad are mainly divided into two categories: active method and passive method.

[0004] Active methods focus on regulating the spatial distribution of plasma, reducing the electron density at the antenna window, and reducing the attenuation of electromagnetic waves in the plasma, such as the injection of electrophilic substances and the magnetic window method.

[0005] The passive law attempts to explore the feasibility of breaking through communication black barriers in new electromagnetic wave frequency bands (such as Ka, THz, laser and other frequency bands).

[0006] The above-mentioned blackout mitigation technologies all face certain engineering costs and challenges. High-frequency communication technology is limited by factors such as atmospheric rain attenuation, short propagation distance, and high power requirements, and still faces huge challenges in engineering applications.

[0007] The electrophilic material injection method is difficult to implement due to its limited injection range and difficulty in penetrating the entire plasma sheath. The magnetic window method uses a strong electromagnetic field to control the plasma distribution, which requires the additional large and heavy strong magnetic generation device, which will seriously affect the payload of the aircraft, and its practicality and economic benefits are relatively low.

[0008] In the prior art, Patent No. 201710049140.1 discloses a method for X-ray communication in a blackout area during a spacecraft's reentry. X-ray communication has an absolute advantage in penetrating plasma, but due to its high directivity, the spacecraft and the ground receiving end must maintain extremely high alignment accuracy.

[0009] Patent No. 202410148826.3 discloses a black barrier communication method based on gain metamaterials. This method fixes the frequency of the incident electromagnetic wave and simultaneously adjusts the dielectric constant and magnetic permeability of the matching metamaterial. It is difficult to implement. Although the matching method using negative magnetic permeability metamaterials can improve the input wave impedance of the plasma, the density of the plasma is low and it is still greatly limited in a strong collision environment. Summary of the invention

[0010] The purpose of the present invention is to overcome the many limitations of existing methods for alleviating blackout communications, including sacrificing the aerodynamic performance and flight load of the aircraft, atmospheric rain attenuation, weak collision environment constraints, and the development of communication equipment, and to provide a blackout communication method and system based on gain metamaterials.

[0011] The present invention provides a black barrier communication method based on gain metamaterial, the method is as follows:

[0012] Simulate the matching system of plasmon-gain metamaterials;

[0013] The matching system includes a plasma layer and an analog gain metamaterial layer that are symmetrically and closely arranged;

[0014] The thickness of the simulated gain metamaterial layer is equal to the thickness of the plasma layer, and the dielectric constant of the simulated gain metamaterial layer and the relative dielectric constant of the plasma layer satisfy the following formula:

[0015]

[0016] Among them, ε 2 is the simulated dielectric constant of the simulated gain metamaterial layer; ε p is the dielectric constant of the plasma layer; * is conjugation; x is any position in the thickness direction of the plasma layer or the simulated gain metamaterial layer, and x=0 at the interface between the plasma layer and the simulated gain metamaterial layer;

[0017] The frequency of the incident electromagnetic wave corresponding to the balance and stability of the matching system is used as the communication signal frequency;

[0018] The balanced stability of the matching system is the state in which the gain and loss of the matching system are balanced and the characteristic value curve is closed;

[0019] When the solid gain metamaterial layer and the plasma layer at the black barrier form a structure of a matching system, communication is performed through a communication signal that matches the frequency of the communication signal;

[0020] The thickness and dielectric constant of the real gain metamaterial layer and the simulated gain metamaterial layer are the same.

[0021] Furthermore, the evaluation of whether the matching system is balanced and stable includes:

[0022] The two eigenvalues ​​λ of the matching system are calculated by the scattering matrix S 1,2 and two eigenvectors ψ 1,2 ;

[0023]

[0024]

[0025] Among them, t L ,t R 、r L and r R are scattering parameters; t L ,t R are the transmission coefficients when the incident electromagnetic wave is incident from the left and right sides of the matching system, respectively, and when the gain and loss are balanced, t L =t R =t;r L 、r R are the reflection coefficients when the incident electromagnetic wave is incident from the left and right sides of the matching system, respectively;

[0026] By energy conservation, the scattering parameter relationship when gain and loss are balanced is obtained:

[0027]

[0028] Among them, R L =|r L | 2 , R R =|r R | 2 , T=|t| 2 ;

[0029] Introduce the condition r that the two eigenvalues ​​and two eigenvectors of the matching system coincide L =0 or r R =0, and we get T=1;

[0030] Substituting formula 4 into formula 1 yields:

[0031]

[0032] Solving for |λ 1 λ 2 |=1;

[0033] Determine whether the two eigenvalues ​​of the matching system satisfy λ 1 =λ 2 =1, the eigenvalue curve is closed and the matching system is stable.

[0034] Furthermore, the polarization mode of the communication signal is transverse magnetic polarization, and the communication signal is vertically incident on the matching system.

[0035] Furthermore, the frequency band of the communication signal is GHz and above.

[0036] Furthermore, in the matching system of the plasma-gain metamaterial, the relative dielectric constant ε of the plasma layer is P for:

[0037]

[0038] Among them, ω Pe is the plasma frequency; ω is the angular frequency of the incident electromagnetic wave, ω=2πf, f is the frequency of the incident electromagnetic wave; i is the sign of the imaginary part; v is the plasma collision frequency.

[0039] The present invention also provides a black barrier communication system based on gain metamaterial, comprising:

[0040] A matching stability evaluation module for simulating matching systems for generating plasmon-gain metamaterials;

[0041] The matching system includes a plasma layer and an analog gain metamaterial layer that are symmetrically and closely arranged;

[0042] The thickness of the simulated gain metamaterial layer is equal to the thickness of the plasma layer, and the dielectric constant of the simulated gain metamaterial layer and the relative dielectric constant of the plasma layer satisfy the following formula:

[0043]

[0044] Among them, ε 2 is the simulated dielectric constant of the simulated gain metamaterial layer; ε p is the dielectric constant of the plasma layer; * is conjugation; x is any position in the thickness direction of the plasma layer or the simulated gain metamaterial layer, and x=0 at the interface between the plasma layer and the simulated gain metamaterial layer;

[0045] and, for evaluating whether the matching system is balanced and stable, and using the frequency of the incident electromagnetic wave corresponding to the matching system being balanced and stable as the frequency of the communication signal;

[0046] The balanced stability of the matching system is the state in which the gain and loss of the matching system are balanced and the characteristic value curve is closed;

[0047] A gain metamaterial tuning module, used to tune the dielectric constant of the physical gain metamaterial layer to be the same as the dielectric constant of the analog gain metamaterial layer;

[0048] A multi-band communication module, used for communicating through a communication signal that matches the communication signal frequency when the solid gain metamaterial layer and the plasma layer at the black barrier form a matching system structure;

[0049] The thickness of the solid gain metamaterial layer is the same as the thickness of the analog gain metamaterial layer.

[0050] Furthermore, the matching stability evaluation module evaluates whether the matching system is balanced and stable in the following way:

[0051] The two eigenvalues ​​λ of the matching system are calculated by the scattering matrix S 1,2 and two eigenvectors ψ 1,2 ;

[0052]

[0053] Among them, t L ,t R 、r L and r R are scattering parameters; t L ,t R are the transmission coefficients when the incident electromagnetic wave is incident from the left and right sides of the matching system, respectively, and when the gain and loss are balanced, t L =t R =t;r L 、r R are the reflection coefficients when the incident electromagnetic wave is incident from the left and right sides of the matching system, respectively;

[0054] By energy conservation, the scattering parameter relationship when gain and loss are balanced is obtained:

[0055]

[0056] Among them, R L =|r L | 2 , R R =|r R | 2 , T=|t| 2 ;

[0057] Introduce the condition r that the two eigenvalues ​​and two eigenvectors of the matching system coincide L =0 or r R =0, and we get T=1;

[0058] Substituting formula 4 into formula 1 yields:

[0059]

[0060] Solving for |λ 1 λ 2|=1;

[0061] Determine whether the two eigenvalues ​​of the matching system satisfy λ 1 =λ 2 =1, the eigenvalue curve is closed and the matching system is stable.

[0062] Furthermore, in the multi-band communication module, the polarization mode of the communication signal is transverse magnetic polarization, and the communication signal is vertically incident on the matching system.

[0063] Furthermore, the frequency band of the communication signal is GHz and above.

[0064] Furthermore, it also includes a plasma parameter diagnosis module;

[0065] The plasma parameter diagnostic module is used to obtain the relative dielectric constant ε of the plasma layer in the following way P :

[0066]

[0067] Among them, ω Pe is the plasma frequency; ω is the angular frequency of the incident electromagnetic wave, ω=2πf, f is the frequency of the incident electromagnetic wave; i is the sign of the imaginary part; v is the plasma collision frequency.

[0068] The beneficial effects of the present invention are:

[0069] The present invention can alleviate the blackout communication problem of high-speed aircraft and has the following advantages:

[0070] 1. No need to add strong magnetic generating devices, reducing aircraft load and flight costs;

[0071] Second, it uses electromagnetic waves in the GHz common communication band, and the communication technology in this band is mature.

[0072] Third, the use of balanced gain matching metamaterials can simultaneously overcome the signal loss caused by high-density strong collision plasma and is suitable for high-density plasma layers;

[0073] 4. The key electromagnetic parameters of the plasma sheath depend on the state parameters of the aircraft such as the altitude, speed and attitude. The tunable capability of metamaterials and the non-fixed frequency of the incident electromagnetic waves can provide important guarantees for reliable and effective communications throughout the flight. BRIEF DESCRIPTION OF THE DRAWINGS

[0074] Figure 1 It is a schematic structural diagram of a black barrier communication system based on gain metamaterials of the present invention;

[0075] Figure 2It is a schematic diagram of the structure of the matching system of plasma-gain metamaterial in the black barrier communication method based on gain metamaterial and the system of the present invention; wherein k is the wave vector; and E is the electric field.

[0076] Figure 3 is the characteristic value curve of the matching system corresponding to the specific embodiment 1; where σ 1 and σ 2 are the base 10 logarithms of the eigenvalues ​​of the scattering matrix S;

[0077] Figure 4 is a transmittance curve after matching by the matching system corresponding to the specific embodiment 1;

[0078] Figure 5 is a characteristic value curve of the matching system corresponding to specific embodiment 2;

[0079] Figure 6 is a transmittance curve after matching by the matching system corresponding to specific embodiment 2;

[0080] Figure 7 This is a plasma density distribution diagram in the plasma layer of the matching system corresponding to specific embodiment 3.

[0081] Figure 8 is a characteristic value curve of the matching system corresponding to specific embodiment 3;

[0082] Fig. 9 It is the transmittance curve after matching of the matching system corresponding to specific embodiment 3. DETAILED DESCRIPTION

[0083] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0084] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0085] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but they are not intended to limit the present invention. Specific implementation method 1

[0087] The black barrier communication method based on gain metamaterial in this embodiment is as follows:

[0088] Simulate the generation of a matching system of plasmon-gain metamaterials;

[0089] The matching system includes a plasma layer and an analog gain metamaterial layer that are symmetrically and closely arranged;

[0090] The thickness of the simulated gain metamaterial layer is equal to the thickness of the plasma layer, and the dielectric constant of the simulated gain metamaterial layer and the relative dielectric constant of the plasma layer satisfy the following formula:

[0091]

[0092] Among them, ε 2 is the simulated dielectric constant of the simulated gain metamaterial layer; ε p is the dielectric constant of the plasma layer; * is conjugation; x is any position in the thickness direction of the plasma layer or the simulated gain metamaterial layer, and x=0 at the interface between the plasma layer and the simulated gain metamaterial layer;

[0093] The frequency of the incident electromagnetic wave corresponding to the balance and stability of the matching system is used as the communication signal frequency;

[0094] The balanced stability of the matching system is the state in which the gain and loss of the matching system are balanced and the characteristic value curve is closed;

[0095] When the solid gain metamaterial layer and the plasma layer at the black barrier form a structure of a matching system, communication is performed through a communication signal that matches the frequency of the communication signal;

[0096] The thickness and dielectric constant of the real gain metamaterial layer and the simulated gain metamaterial layer are the same.

[0097] Specifically, the present invention provides a signal loss compensation scheme based on gain metamaterials, which can effectively improve the transmission rate of electromagnetic waves (GHz band) in dense strong collision plasma by constructing a metamaterial-plasma double-layer structure with balanced gain and loss.

[0098] The specific steps are as follows:

[0099] Step 1: Use the plasma parameter diagnostic module on the ground to simulate and predict the typical black barrier plasma layer environment (plasma sheath) at different altitudes.

[0100] Step 2: Use the matching stability evaluation module to simulate the balanced gain metamaterial to evaluate the matching stability of the metamaterial-plasma system:

[0101] Plasma-gain metamaterial matching system stability evaluation. The metamaterial with balanced gain level is simulated, and its gain characteristics are characterized by the imaginary part of its dielectric constant. The gain level of the metamaterial is equivalent to the loss level of the plasma, and its dielectric constant ε 2 It can be expressed as:

[0102] ε 2 (x) = εp * (-x)

[0103] In the formula, * indicates conjugation.

[0104] like Figure 2 As shown in the figure, the plasma layer and the gain metamaterial layer with the same thickness of d are placed side by side, and the relative dielectric constant and relative magnetic permeability of the plasma layer and the gain metamaterial layer are (ε p , μ p =1) and (ε 2 , μ 2 =1), the medium on both sides is vacuum. TM (Transverse Magnetic Field) polarized electromagnetic wave is incident on the double-layer structure from the left or right side, with a frequency of f and an incident angle of θ.

[0105] Step 3: Form a physical metamaterial with balanced gain level. The thickness of the physical metamaterial is consistent with that of the plasma. The dielectric constant of the metamaterial can be determined according to the selected communication wave frequency, and then adjusted to the corresponding size through the gain metamaterial tuning module.

[0106] Step 4: Transmit corresponding communication signals. Specific implementation method 2

[0108] This embodiment is a further explanation of the first embodiment. In this embodiment, evaluating whether the matching system is balanced and stable includes:

[0109] The two eigenvalues ​​λ of the matching system are calculated by the scattering matrix S 1,2 and two eigenvectors ψ 1,2 ;

[0110]

[0111]

[0112] Among them, t L ,t R 、r L and r R are scattering parameters; t L ,t R are the transmission coefficients when the incident electromagnetic wave is incident from the left and right sides of the matching system, respectively, and when the gain and loss are balanced, t L =t R =t;r L 、r R are the reflection coefficients when the incident electromagnetic wave is incident from the left and right sides of the matching system, respectively;

[0113] By energy conservation, the scattering parameter relationship when gain and loss are balanced is obtained:

[0114]

[0115] Among them, R L =|r L | 2 , R R =|r R | 2 , T=|t| 2 ;

[0116] Introduce the condition r that the two eigenvalues ​​and two eigenvectors of the matching system coincide L =0 or r R =0, and we get T=1;

[0117] Substituting formula 4 into formula 1 yields:

[0118]

[0119] Solving for |λ 1 λ 2 |=1;

[0120] Determine whether the two eigenvalues ​​of the matching system satisfy λ 1 =λ 2 =1, the eigenvalue curve is closed and the matching system is stable.

[0121] The other technical features of this embodiment are exactly the same as those of the first embodiment.

[0122] Specifically, the specific evaluation process of step 2 in Example 1 is as follows:

[0123] The matching stability of the plasmon-metamaterial system is described by the scattering matrix S:

[0124]

[0125] In the formula, the diagonal component r L and r R They represent the reflection coefficients when the electromagnetic wave is incident from the left and right sides, respectively. The t L and t R They represent the transmission coefficients when the electromagnetic wave is incident from the left and right sides, respectively. In a balanced system, t = t L =t R .

[0126] Solve the eigenvalue of the scattering matrix S in the formula, analyze the singular point conditions where the eigenvalue and eigenvector coincide at the same time, and reveal the abnormal scattering phenomenon. From the above formula, we can get the eigenvalue λ of the scattering matrix 1,2 and the eigenvector ψ 1,2 for

[0127]

[0128]

[0129] According to the above formula, when r L =0 or r R = 0, the eigenvalue and eigenvector coincide at the same time, forming a singular point. At this time, the system has anisotropic transmission, that is, one-way without reflection. If the gain and loss of the system are balanced, the scattering parameters have the relationship:

[0130]

[0131] Among them, R L =|r L | 2 , R R =|r R | 2 , T=|t| 2 Then the characteristic value of the scattering parameter can be further expressed as

[0132]

[0133] It can be obtained that the formation condition of the singular point is T = 1, at this time the system has bidirectional full transmission (T = 1) and unidirectional no reflection (r L =0 or r R =0) behavior. We can also get |λ 1 λ 2 |=1, when λ 1 =λ 2 =1, the characteristic frequency is a real number, and the system remains balanced and stable. 1 =1 / λ 2 When , the system balance is destroyed, the characteristic frequency has an imaginary part, and the matching system cannot exist stably.

[0134] In summary, the stability of the gain metamaterial-plasma matching system can be determined from the eigenvalue distribution of the scattering matrix S. For a certain matching system, when the incident wave frequency increases, the eigenvalue curve of the system will gradually close, and the matching system will tend to be stable. Therefore, the communication wave frequency corresponding to the system stability should be selected. Specific implementation method three

[0136] This embodiment is a further description of the first or second embodiment. In step 4 of this embodiment:

[0137] The polarization mode of the communication signal is transverse magnetic polarization, and the communication signal is vertically incident on the matching system.

[0138] The other technical features of this embodiment are exactly the same as those of embodiment one or two.

[0139] Specifically, in step 4 of the first specific implementation mode, the polarization mode of the communication signal is transverse magnetic polarization, and the electromagnetic wave is vertically irradiated on the double-layer structure of the metamaterial-plasma. Specific implementation method four

[0141] This implementation mode is a further description of the third implementation mode. In this implementation mode, the frequency band of the communication signal is GHz and above.

[0142] The other technical features of this embodiment are exactly the same as those of the third embodiment. Specific implementation method five

[0144] This embodiment is a further description of the first, second or fourth embodiment. In the matching system of the plasma-gain metamaterial in this embodiment, the relative dielectric constant ε of the plasma layer is P for:

[0145]

[0146] Among them, ω Pe is the plasma frequency; ω is the angular frequency of the incident electromagnetic wave, ω=2πf, f is the frequency of the incident electromagnetic wave; i is the sign of the imaginary part; v is the plasma collision frequency.

[0147] The other technical features of this embodiment are exactly the same as those of embodiments one, two or four.

[0148] Specifically, in step 1 of the first embodiment, the plasma parameter diagnosis module obtains characteristic parameters of the plasma (thickness, electron density and collision frequency) and predicts the parameters of the plasma sheath (plasma layer).

[0149] Obtain the characteristic parameters of the plasma sheath, including thickness, electron density, and collision frequency. Here, the dielectric constant of the plasma is generally described by the Drude model, and its relative dielectric constant ε p It can be expressed as:

[0150]

[0151] Where ω pe is the plasma frequency, which is expressed as n e is the electron density of the plasma, e is the unit charge, ε 0 is the relative dielectric constant in vacuum, m e is the electron mass, ω is the angular frequency of the incident wave (ω=2πf), and v is the plasma collision frequency. Specific implementation method 6

[0153] The black barrier communication system based on gain metamaterial of this embodiment includes:

[0154] A matching stability evaluation module for simulating matching systems for generating plasmon-gain metamaterials;

[0155] The matching system includes a plasma layer and an analog gain metamaterial layer that are symmetrically and closely arranged;

[0156] The thickness of the simulated gain metamaterial layer is equal to the thickness of the plasma layer, and the dielectric constant of the simulated gain metamaterial layer and the relative dielectric constant of the plasma layer satisfy the following formula:

[0157]

[0158] Among them, ε 2 is the simulated dielectric constant of the simulated gain metamaterial layer; ε p is the dielectric constant of the plasma layer; * is conjugation; x is any position in the thickness direction of the plasma layer or the simulated gain metamaterial layer, and x=0 at the interface between the plasma layer and the simulated gain metamaterial layer;

[0159] and, for evaluating whether the matching system is balanced and stable, and using the frequency of the incident electromagnetic wave corresponding to the matching system being balanced and stable as the frequency of the communication signal;

[0160] The balanced stability of the matching system is the state in which the gain and loss of the matching system are balanced and the characteristic value curve is closed;

[0161] A gain metamaterial tuning module, used to tune the dielectric constant of the physical gain metamaterial layer to be the same as the dielectric constant of the analog gain metamaterial layer;

[0162] A multi-band communication module, used for communicating through a communication signal that matches the communication signal frequency when the solid gain metamaterial layer and the plasma layer at the black barrier form a matching system structure;

[0163] The thickness of the solid gain metamaterial layer is the same as the thickness of the analog gain metamaterial layer. Specific implementation method seven

[0165] This embodiment is a further explanation of the sixth embodiment. In this embodiment, the matching stability evaluation module evaluates whether the matching system is balanced and stable in the following manner:

[0166] The two eigenvalues ​​λ of the matching system are calculated by the scattering matrix S 1,2 and two eigenvectors ψ 1,2 ;

[0167]

[0168]

[0169] Among them, t L ,t R 、r L and r R are scattering parameters; t L ,t R are the transmission coefficients when the incident electromagnetic wave is incident from the left and right sides of the matching system, respectively, and when the gain and loss are balanced, t L =t R =t;r L 、r R are the reflection coefficients when the incident electromagnetic wave is incident from the left and right sides of the matching system, respectively;

[0170] By energy conservation, the scattering parameter relationship when gain and loss are balanced is obtained:

[0171]

[0172] Among them, R L =|r L | 2 , R R =|r R | 2 , T=|t| 2 ;

[0173] Introduce the condition r that the two eigenvalues ​​and two eigenvectors of the matching system coincide L =0 or r R =0, and we get T=1;

[0174] Substituting formula 4 into formula 1 yields:

[0175]

[0176] Solving for |λ 1 λ 2 |=1;

[0177] Determine whether the two eigenvalues ​​of the matching system satisfy λ 1 =λ 2 =1, the eigenvalue curve is closed and the matching system is stable.

[0178] The other technical features of this embodiment are exactly the same as those of embodiment six. Specific implementation method eight

[0180] This embodiment is a further description of the sixth or seventh embodiment. In this embodiment, in the multi-band communication module, the polarization mode of the communication signal is transverse magnetic polarization, and the communication signal is vertically incident on the matching system.

[0181] The other technical features of this embodiment are exactly the same as those of embodiment six or seven. Specific implementation method nine

[0183] This implementation mode is a further description of the eighth implementation mode. In this implementation mode, the frequency band of the communication signal is GHz and above.

[0184] The other technical features of this embodiment are exactly the same as those of embodiment eight. Specific implementation method ten

[0186] This embodiment is a further description of the sixth, seventh or ninth embodiment. In this embodiment, a plasma parameter diagnosis module is also included;

[0187] The plasma parameter diagnostic module is used to obtain the relative dielectric constant ε of the plasma layer in the following way P :

[0188]

[0189] Among them, ω Pe is the plasma frequency; ω is the angular frequency of the incident electromagnetic wave, ω=2πf, f is the frequency of the incident electromagnetic wave; i is the sign of the imaginary part; v is the plasma collision frequency.

[0190] The other technical features of this embodiment are exactly the same as those of embodiments six, seven or nine.

[0191] The specific embodiments formed according to the present invention are as follows:

[0192] Specific embodiment 1: Plasma and gain metamaterial are placed as follows Figure 2 As shown. The plasma is uniformly distributed, with a density of n e =1e18m -3 , collision frequency υ = 10 GHz, the thickness of plasma and gain metamaterial are both 10 cm, plasma and metamaterial are placed side by side and closely, and electromagnetic waves are irradiated vertically from the left side onto the double-layer structure. Figure 3 As shown in the figure, the eigenvalue of the matching system changes with the frequency of the incident wave. As the frequency of the incident wave increases, the eigenvalue changes from bifurcation to closure, and the critical frequency of system stability is 12.53 GHz. Figure 4 As shown, when the incident wave frequency is greater than 13.95 GHz, the electromagnetic wave can completely pass through the plasma-metamaterial matching system.

[0193] Specific embodiment 2: Plasma and gain metamaterial are placed as follows Figure 2 As shown. The plasma is uniformly distributed, with a density of n e =1e19m -3, collision frequency υ = 10 GHz, the thickness of plasma and gain metamaterial are both 10 cm, plasma and metamaterial are placed side by side and closely, and electromagnetic waves are irradiated vertically from the left side onto the double-layer structure. Figure 5 As shown in the figure, the eigenvalue of the matching system changes with the frequency of the incident wave. As the frequency of the incident wave increases, the eigenvalue changes from bifurcation to closure, and the critical frequency of system stability is 41.54 GHz. Figure 6 As shown, when the incident wave frequency is greater than 43.56 GHz, the electromagnetic wave can completely pass through the plasma-metamaterial matching system.

[0194] Specific embodiment 3: Plasma and gain metamaterial are placed as follows Figure 2 The plasma is non-uniformly distributed, and the density distribution is as follows Figure 7 As shown, the collision frequency υ = 10 GHz, the thickness of the plasma and the gain metamaterial are both 10 cm, the plasma and the metamaterial are placed side by side and closely, and the electromagnetic wave is irradiated vertically from the left side onto the double-layer structure. Figure 8 As shown in the figure, the eigenvalue of the matching system changes with the frequency of the incident wave. As the frequency of the incident wave increases, the eigenvalue changes from bifurcation to closure, and the critical frequency of system stability is 30.34 GHz. Fig. 9 As shown, when the incident wave frequency is greater than 31.36 GHz, the electromagnetic wave can completely pass through the plasma-metamaterial matching system.

Claims

1. A black barrier communication method based on gain metamaterials, characterized in that: The method is as follows: Simulate the matching system of plasmon-gain metamaterials; The matching system includes a plasma layer and an analog gain metamaterial layer that are symmetrically and closely arranged; The thickness of the analog gain metamaterial layer is equal to the thickness of the plasma layer, and the dielectric constant of the analog gain metamaterial layer and the relative dielectric constant of the plasma layer satisfy the following formula: Where ε2 is the simulated dielectric constant of the simulated gain metamaterial layer; ε p is the dielectric constant of the plasma layer; * is conjugation; x is any position in the thickness direction of the plasma layer or the simulated gain metamaterial layer, and x=0 at the interface between the plasma layer and the simulated gain metamaterial layer; The frequency of the incident electromagnetic wave corresponding to the matching system being in a stable balance is used as the frequency of the communication signal; The matching system is balanced and stable when the gain and loss of the matching system are balanced and the characteristic value curve is closed; When the physical gain metamaterial layer and the plasma layer at the black barrier form the structure of the matching system, communication is performed through a communication signal that conforms to the frequency of the communication signal; The physical gain metamaterial layer and the analog gain metamaterial layer have the same thickness and dielectric constant.

2. The black barrier communication method based on gain metamaterial according to claim 1, characterized in that: Evaluating whether the matching system is balanced and stable includes: The two eigenvalues ​​λ of the matching system are calculated by the scattering matrix S 1,2 and two eigenvectors ψ 1,2 ; Among them, t L ,t R 、r L and r R are scattering parameters; t L ,t R are the transmission coefficients when the incident electromagnetic wave is incident from the left and right sides of the matching system, respectively, and when the gain and loss are balanced, t L =t R =t;r L 、r R are respectively reflection coefficients when the incident electromagnetic wave is incident from the left and right sides of the matching system; By energy conservation, the scattering parameter relationship when gain and loss are balanced is obtained: Among them, R L =|r L | 2 , R R =|r R | 2 , T=|t| 2 ; Introduce the condition r that the two eigenvalues ​​and two eigenvectors of the matching system coincide L =0 or r R =0, and we get T=1; Substituting formula 4 into formula 1 yields: Solving it, we get |λ1λ2|=1; It is determined whether the two eigenvalues ​​of the matching system satisfy λ1=λ2=1. If so, the eigenvalue curve is closed and the matching system is stable.

3. The black barrier communication method based on gain metamaterial according to claim 1 or 2, characterized in that: The polarization mode of the communication signal is transverse magnetic polarization, and the communication signal is vertically incident on the matching system.

4. The black barrier communication method based on gain metamaterial according to claim 3, characterized in that: The frequency band of communication signals is GHz and above.

5. The black barrier communication method based on gain metamaterial according to claim 1, 2 or 4, characterized in that: Relative dielectric constant ε of the plasma layer in the matching system of plasma-gain metamaterial P for: Among them, ω Pe is the plasma frequency; ω is the angular frequency of the incident electromagnetic wave, ω=2πf, f is the frequency of the incident electromagnetic wave; i is the sign of the imaginary part; v is the plasma collision frequency.

6. A black barrier communication system based on gain metamaterials, characterized in that: include: A matching stability evaluation module for simulating matching systems for generating plasmon-gain metamaterials; The matching system includes a plasma layer and an analog gain metamaterial layer that are symmetrically and closely arranged; The thickness of the analog gain metamaterial layer is equal to the thickness of the plasma layer, and the dielectric constant of the analog gain metamaterial layer and the relative dielectric constant of the plasma layer satisfy the following formula: Where ε2 is the simulated dielectric constant of the simulated gain metamaterial layer; ε p is the dielectric constant of the plasma layer; * is conjugation; x is any position in the thickness direction of the plasma layer or the simulated gain metamaterial layer, and x=0 at the interface between the plasma layer and the simulated gain metamaterial layer; and, for evaluating whether the matching system is balanced and stable, and using the frequency of the incident electromagnetic wave corresponding to the matching system being balanced and stable as the frequency of the communication signal; The matching system is balanced and stable when the gain and loss of the matching system are balanced and the characteristic value curve is closed; A gain metamaterial tuning module, used to tune the dielectric constant of the physical gain metamaterial layer to be the same as the dielectric constant of the analog gain metamaterial layer; A multi-band communication module, used for communicating through a communication signal conforming to the communication signal frequency when the solid gain metamaterial layer and the plasma layer at the black barrier form the structure of the matching system; The thickness of the physical gain metamaterial layer is the same as the thickness of the analog gain metamaterial layer.

7. The black barrier communication system based on gain metamaterial according to claim 6, characterized in that: The matching stability evaluation module evaluates whether the matching system is balanced and stable in the following manner: The two eigenvalues ​​λ of the matching system are calculated by the scattering matrix S 1,2 and two eigenvectors ψ 1,2 ; Among them, t L ,t R 、r L and r R are scattering parameters; t L ,t R are the transmission coefficients when the incident electromagnetic wave is incident from the left and right sides of the matching system, respectively, and when the gain and loss are balanced, t L =t R =t;r L 、r R are respectively reflection coefficients when the incident electromagnetic wave is incident from the left and right sides of the matching system; By energy conservation, the scattering parameter relationship when gain and loss are balanced is obtained: Among them, R L =|r L | 2 , R R =|r R | 2 , T=|t| 2 ; Introduce the condition r that the two eigenvalues ​​and two eigenvectors of the matching system coincide L =0 or r R =0, and we get T=1; Substituting formula 4 into formula 1 yields: Solving it, we get |λ1λ2|=1; It is determined whether the two eigenvalues ​​of the matching system satisfy λ1=λ2=1. If so, the eigenvalue curve is closed and the matching system is stable.

8. The black barrier communication system based on gain metamaterial according to claim 6 or 7, characterized in that: In the multi-band communication module, the polarization mode of the communication signal is transverse magnetic polarization, and the communication signal is vertically incident on the matching system.

9. The black barrier communication system based on gain metamaterial according to claim 8, characterized in that: The frequency band of communication signals is GHz and above.

10. The blackout communication system based on gain metamaterial according to claim 6, 7 or 9, characterized in that: Also included is a plasma parameter diagnostic module; The plasma parameter diagnosis module is used to obtain the relative dielectric constant ε of the plasma layer in the following way P : Among them, ω Pe is the plasma frequency; ω is the angular frequency of the incident electromagnetic wave, ω=2πf, f is the frequency of the incident electromagnetic wave; i is the sign of the imaginary part; v is the plasma collision frequency.

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