CN111987468A - Reflective energy selection structure - Google Patents
Reflective energy selection structure Download PDFInfo
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- CN111987468A CN111987468A CN202010646873.5A CN202010646873A CN111987468A CN 111987468 A CN111987468 A CN 111987468A CN 202010646873 A CN202010646873 A CN 202010646873A CN 111987468 A CN111987468 A CN 111987468A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
- H01Q15/0006—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices
- H01Q15/0013—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices said selective devices working as frequency-selective reflecting surfaces, e.g. FSS, dichroic plates, surfaces being partly transmissive and reflective
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
- H01Q15/0006—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices
- H01Q15/0013—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices said selective devices working as frequency-selective reflecting surfaces, e.g. FSS, dichroic plates, surfaces being partly transmissive and reflective
- H01Q15/0026—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices said selective devices working as frequency-selective reflecting surfaces, e.g. FSS, dichroic plates, surfaces being partly transmissive and reflective said selective devices having a stacked geometry or having multiple layers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
- H01Q15/0006—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices
- H01Q15/0013—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices said selective devices working as frequency-selective reflecting surfaces, e.g. FSS, dichroic plates, surfaces being partly transmissive and reflective
- H01Q15/0046—Theoretical analysis and design methods of such selective devices
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
- H01Q15/0006—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices
- H01Q15/0086—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices said selective devices having materials with a synthesized negative refractive index, e.g. metamaterials or left-handed materials
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- Engineering & Computer Science (AREA)
- Bioinformatics & Cheminformatics (AREA)
- Bioinformatics & Computational Biology (AREA)
- Aerials With Secondary Devices (AREA)
Abstract
The invention relates to a reflective energy selection structure, belongs to the technical field of material regulation and control, and solves the problems that a reflector antenna in the prior art is poor in protection effect and easy to damage. The reflective energy selection structure comprises at least one layer of super surface structure, a diode and a power supply; the super-surface structure comprises a plurality of metal resonance units arranged in a two-dimensional array, the metal resonance units comprise n metal sheets arranged in a one-dimensional array, and n is more than or equal to 3 and less than or equal to 10; adjacent metal sheets in the super-surface structure on the outermost layer are connected through a diode; the power supply is used for supplying power to the diode; when high electromagnetic pulse is incident, the super-surface structure is used for changing the phase of the high electromagnetic pulse and deflecting the reflected high electromagnetic pulse so as to deviate from the feed source, thereby effectively protecting system electronic equipment at the feed source of the reflector antenna and preventing the system electronic equipment from being damaged by the incident electromagnetic pulse.
Description
Technical Field
The invention relates to the technical field of material regulation and control, in particular to a reflective energy selection structure.
Background
With the continuous development of information technology, the electronization degree of an information system is higher and higher, the sensitivity to an electromagnetic field is also higher and higher, electromagnetic pulses have certain influence on electronic equipment to a certain extent, and can damage the electronic system equipment to a certain extent, so that the whole system equipment is damaged, huge loss is caused, and the protection of the system is urgently considered. In order to solve these problems, a measure of energy selection surface has been proposed in recent years, mainly aiming at the protection effect on the circuit device according to different purposes when electromagnetic fields with different intensities are incident.
At present, on one hand, the traditional electromagnetic protection mainly inhibits high electromagnetic pulses through means of filtering, shielding and the like, covers electronic equipment by utilizing a metal layer, plays a role in shielding high-energy electromagnetic pulses, allows low-energy electromagnetic signals to pass through, and designs an electromagnetic energy selection surface with electromagnetic energy low-pass characteristic; on the other hand, the limiter is added in the protective circuit device, but due to the power limitation of electronic devices, the limiter can be burnt when high-power electromagnetic pulses are incident.
Firstly, protection by means of filtering and shielding high electromagnetic pulses can cause information or signals carried by the high electromagnetic pulses to be shielded, so that the efficiency of receiving signals by a reflector antenna is reduced; secondly, only part of high electromagnetic pulses can be shielded by the method of the amplitude limiter, and system electronic equipment at the feed source is still possibly damaged, so that the protection effect is poor.
Disclosure of Invention
In view of the above analysis, the present invention is directed to a reflective energy selection structure for solving the problem of the existing protection method that has poor protection effect and damages the electronic device of the reflector antenna system.
The embodiment of the invention provides a reflective energy selection structure, which is coupled to a reflector antenna and comprises at least one layer of super-surface structure, a diode and a power supply;
the super-surface structure comprises a plurality of metal resonance units arranged in a two-dimensional array, the metal resonance units comprise n metal sheets arranged in a one-dimensional array, and n is more than or equal to 3 and less than or equal to 10;
adjacent metal sheets in the super-surface structure on the outermost layer are connected through a diode; the power supply is used for supplying power to the diode;
when the high electromagnetic pulse is incident, the super-surface structure is used for changing the phase of the high electromagnetic pulse, so that the reflected high electromagnetic pulse is deflected and deviates from the feed source.
Further, the size and the thickness of each metal sheet in the metal resonance unit are determined through size scanning, so that the phase of the reflected high electromagnetic pulse is changed in a gradient manner within the range of-180 degrees.
Furthermore, the magnitude of the forward bias voltage is set according to the conducting voltage of the diode.
Further, when a low electromagnetic pulse is incident, the diode is conducted, and the super-surface structure reflects the low electromagnetic pulse to the feed source; when high electromagnetic pulse is incident, the diode is cut off, the super-surface structure changes the phase of the high electromagnetic pulse, and the reflected high electromagnetic pulse is deflected to deviate from the feed source.
Further, the deflection angle of the reflected high electromagnetic pulse is determined by the following formula:
wherein, theta is a deflection angle, delta phi is a phase gradient, and lambda is an operating wavelength.
Further, the size scanning range of the metal sheet is
And the lambda is the working wavelength.
Further, the thickness scanning range of the metal sheet is
And the lambda is the working wavelength.
Further, the size of the metal resonance unit is smaller than the working wavelength.
Further, the super-surface structure further comprises a dielectric substrate, and the metal resonance units arranged in a two-dimensional array are coupled with the dielectric substrate.
Further, the dielectric substrate of the super-surface structure of the innermost layer is coupled to the concave side of the reflector antenna.
Compared with the prior art, the invention can realize at least one of the following beneficial effects:
1. the reflective energy selection structure provided by the invention connects metal sheets with different sizes through the diode, and the phase of the metal sheets can be changed when high electromagnetic pulse is incident, so that the reflection of the metal sheets is deflected, the metal sheets are far away from the feed source of the reflector antenna, signals can be received more efficiently, and system electronic equipment at the feed source is effectively protected from being damaged;
2. according to the invention, the phases of high electromagnetic pulses are regulated and controlled by designing metal sheets with different sizes in the super-surface structure to form gradient change, and the deflection angle of high electromagnetic recoil reflection is regulated and controlled according to the phase gradient difference so as to obtain the required deflection angle.
3. According to the invention, through designing the multilayer super-surface structure, the regulation and control of the high electromagnetic pulse phase are enhanced, so that the emission deflection of the high electromagnetic pulse phase is more accurate, and the protection effect on the electronic equipment of the system at the reflecting surface antenna feed source position is improved.
4. The reflective energy selection structure provided by the invention does not need to change the circuit of the system electronic equipment of the reflector antenna, is convenient to manufacture, is easy to integrate and has low cost.
In the invention, the technical schemes can be combined with each other to realize more preferable combination schemes. Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and drawings.
Drawings
The drawings are only for purposes of illustrating particular embodiments and are not to be construed as limiting the invention, wherein like reference numerals are used to designate like parts throughout.
FIG. 1 is a schematic diagram of a reflective energy selection structure according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a metal resonant unit structure according to an embodiment of the present invention;
FIG. 3 is a schematic view of a portion of a super-surface structure in accordance with an embodiment of the present invention;
FIG. 4 is a far field pattern of low electromagnetic pulse incidence in accordance with an embodiment of the present invention;
FIG. 5 is a far field pattern of a high electromagnetic pulse incident according to an embodiment of the present invention.
Reference numerals:
1-a metal sheet; 2-a diode; 3-a media base; 4-reflector antenna
Detailed Description
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate preferred embodiments of the invention and together with the description, serve to explain the principles of the invention and not to limit the scope of the invention.
The invention discloses a reflective energy selection structure, which comprises at least one layer of super-surface structure, a diode and a power supply. Specifically, as shown in fig. 1, a layer of super-surface structure may be included, and a plurality of layers of super-surface structures may also be included, and when a plurality of layers of super-surface structures are included, the plurality of layers of super-surface structures are sequentially stacked and coupled to each other.
The super-surface structure comprises a plurality of metal resonance units arranged in a two-dimensional array, each metal resonance unit comprises n metal sheets arranged in a one-dimensional array, and n is more than or equal to 3 and less than or equal to 10.
Adjacent metal sheets in the super-surface structure on the outermost layer are connected through a diode, the diode can be a switch diode or a capacitance diode, and a power supply is used for supplying power to the diode. Preferably, the magnitude of the forward bias voltage is set according to the on-voltage of the diode, and the magnitude of the forward bias voltage is equal to the magnitude of the power supply voltage of the power supply.
When the high electromagnetic pulse is incident, the super-surface structure is used for changing the phase of the high electromagnetic pulse, so that the reflected high electromagnetic pulse is deflected and deviates from the feed source.
Preferably, the super-surface structure further comprises a dielectric substrate, and the metal resonance units arranged in the two-dimensional array are coupled with the dielectric substrate. Specifically, the dielectric substrate may be a printed circuit board in the microwave band, plastic, silicon oxide, alumina ceramic, ferrite, ferroelectric medium, ferromagnetic medium, or nonlinear medium.
Preferably, the dielectric substrate of the super-surface structure of the innermost layer is coupled to the concave side of the reflector antenna.
Preferably, the size of the metal sheet in the metal resonance unit may be designed according to different reflecting surface antennas, so that the high electromagnetic pulse presents different phase gradient changes when being incident, thereby obtaining a required deflection angle, and specifically, the deflection angle of the reflected high electromagnetic pulse may be determined by the following formula:
wherein, theta is a deflection angle, delta phi is a phase gradient, lambda is a working wavelength, and the phase gradient is a phase difference corresponding to the gradient change of the phase when the high electromagnetic pulse is incident
Illustratively, according to the required deflection angle of the reflection of the high electromagnetic pulse, the metal resonance unit is determined to comprise 8 metal sheets with successively decreasing sizes, so that the phase of the high electromagnetic pulse is changed in a gradient manner within the range of-180 degrees to 180 degrees.
The material of the metal sheet may be copper, aluminum, steel, gold or silver, and the metal sheet of copper material is preferably selected in consideration of the cost of the structure selected for reflecting energy. Specifically, the shape of the metal sheet may be square or circular.
Illustratively, the shape of the metal sheet is square, according to the corresponding target phase
Scanning the side length of each metal sheet in the metal resonance unit within a range
The thickness of the metal sheet is scanned within the range of (1), and the thicknesses of all the metal sheets in the super-surface structure are the same, namely, the metal resonance unit is simulated by using FDTD (finite Difference time Domain)
The side length of each metal sheet is scanned and calculated within the range
The thickness of the metal sheet is scanned and calculated to determine the side length of 8 metal sheets which make the high electromagnetic phase change in a gradient manner, and a metal resonance unit is obtained, as shown in fig. 2. A partial schematic view of the super-surface structure is shown in fig. 3.λ is the operating wavelength, i.e. the wavelength of the incident electromagnetic wave.
Preferably, if the metal sheet is circular, the metal sheet is coated on the surface of the metal sheet
The diameter of the metal sheet is scanned over the range.
Preferably, the size of the metallic resonance unit is smaller than the operating wavelength.
Exemplarily, when λ is 10GHz, the correspondence between the side length of 8 metal sheets and the phase of the high electromagnetic pulse is obtained as shown in table 1:
TABLE 1
In the table, a is the side length of the metal sheet in mm.
Illustratively, the thickness of the metal sheet obtained is 0.018 mm.
Specifically, when low electromagnetic pulse is incident, the forward bias voltage of the diode cannot be influenced, the diode is conducted under the forward bias voltage, the super-surface structure is equivalent to a metal mesh grid structure, the low electromagnetic pulse is subjected to mirror reflection at the metal mesh grid structure and is reflected to the feed source, and the low electromagnetic pulse is low in energy and cannot damage system electronic equipment at the feed source of the reflector antenna. When high electromagnetic pulse is incident, the forward bias voltage of the diode can be damaged, namely a reverse bias voltage is applied to the diode, so that the diode is cut off, at the moment, the super-surface structure is equivalent to a discrete metal sheet to form an array, and the metal sheets with different sizes can change the phase of the high electromagnetic pulse and enable the phase to be changed in a gradient manner, so that the reflected high electromagnetic pulse is deflected to be deviated from a feed source.
Illustratively, when a low electromagnetic pulse is incident, a corresponding far-field directional pattern is as shown in fig. 4, and as can be seen from the diagram, a corresponding deflection angle is 0 °, that is, the low electromagnetic pulse is incident on the super-surface structure and undergoes specular reflection, and is reflected to a feed source of the reflector antenna; when high electromagnetic pulse is incident, the corresponding far field directional diagram is shown in fig. 5, and it can be seen from the diagram that the corresponding deflection angle is 6 degrees, namely the high electromagnetic pulse is incident to the super-surface structure, and the phase is changed, so that the reflected high electromagnetic pulse is deflected to deviate from the feed source, thereby playing the role of protecting the feed source.
Compared with the prior art, the invention can realize at least one of the following beneficial effects:
1. the reflective energy selection structure provided by the invention connects metal sheets with different sizes through the diode, and the phase of the metal sheets can be changed when high electromagnetic pulse is incident, so that the reflection of the metal sheets is deflected, the metal sheets are far away from the feed source of the reflector antenna, signals can be received more efficiently, and system electronic equipment at the feed source is effectively protected from being damaged;
2. according to the invention, the phases of high electromagnetic pulses are regulated and controlled by designing metal sheets with different sizes in the super-surface structure to form gradient change, and the deflection angle of high electromagnetic recoil reflection is regulated and controlled according to the phase gradient difference so as to obtain the required deflection angle.
3. According to the invention, through designing the multilayer super-surface structure, the regulation and control of the high electromagnetic pulse phase are enhanced, so that the emission deflection of the high electromagnetic pulse phase is more accurate, and the protection effect on the electronic equipment of the system at the reflecting surface antenna feed source position is improved.
4. The reflective energy selection structure provided by the invention does not need to change the circuit of the system electronic equipment of the reflector antenna, is convenient to manufacture, is easy to integrate and has low cost.
Those skilled in the art will appreciate that all or part of the flow of the method implementing the above embodiments may be implemented by a computer program, which is stored in a computer readable storage medium, to instruct related hardware. The computer readable storage medium is a magnetic disk, an optical disk, a read-only memory or a random access memory.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention.
Claims (10)
1. A reflective energy selection structure is coupled with a reflector antenna and is characterized by comprising at least one layer of super-surface structure, a diode and a power supply;
the super-surface structure comprises a plurality of metal resonance units arranged in a two-dimensional array, the metal resonance units comprise n metal sheets arranged in a one-dimensional array, and n is more than or equal to 3 and less than or equal to 10;
adjacent metal sheets in the super-surface structure on the outermost layer are connected through a diode; the power supply is used for supplying power to the diode;
when the high electromagnetic pulse is incident, the super-surface structure is used for changing the phase of the high electromagnetic pulse, so that the reflected high electromagnetic pulse is deflected and deviates from the feed source.
2. The reflective energy selecting structure of claim 1, wherein the phase of the reflected high electromagnetic pulse is varied in a gradient from-180 ° to 180 ° by size scanning to determine the size and thickness of each metal sheet in the metal resonance unit.
3. The reflective energy selection structure of claim 2, wherein the magnitude of the forward bias voltage is set according to a turn-on voltage of the diode.
4. The reflective energy selective structure of claim 3, wherein upon incidence of a low electromagnetic pulse, said diode is turned on, and said super-surface structure reflects said low electromagnetic pulse to a feed source; when high electromagnetic pulse is incident, the diode is cut off, the super-surface structure changes the phase of the high electromagnetic pulse, and the reflected high electromagnetic pulse is deflected to deviate from the feed source.
5. The reflective energy selective structure of claim 4, wherein the deflection angle of the reflected high electromagnetic pulse is determined by the following equation:
wherein, theta is a deflection angle, delta phi is a phase gradient, and lambda is an operating wavelength.
6. The reflective energy selective structure of claim 2, wherein the metal sheet has a dimensional sweep of a range of
And the lambda is the working wavelength.
7. The reflective energy selective structure of claim 6, wherein the metal sheet isHas a thickness scanning range of
And the lambda is the working wavelength.
8. The reflective energy selective structure of claim 7, wherein the metallic resonant cells are sized smaller than an operating wavelength.
9. The reflective energy selective structure of any one of claims 1 to 8, wherein the super-surface structure further comprises a dielectric substrate, and the metal resonant units arranged in a two-dimensional array are coupled to the dielectric substrate.
10. The reflective energy selective structure of claim 9, wherein the dielectric substrate of the super-surface structure of the innermost layer is coupled to the concave side of the reflector antenna.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113285233A (en) * | 2021-05-18 | 2021-08-20 | 西北工业大学深圳研究院 | F-P cavity antenna based on dielectric-based metamaterial and electronic equipment |
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