CN113594706A - Low-profile low-RCS broadband wave-absorbing metamaterial - Google Patents
Low-profile low-RCS broadband wave-absorbing metamaterial Download PDFInfo
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- CN113594706A CN113594706A CN202110758479.5A CN202110758479A CN113594706A CN 113594706 A CN113594706 A CN 113594706A CN 202110758479 A CN202110758479 A CN 202110758479A CN 113594706 A CN113594706 A CN 113594706A
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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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- 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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q17/00—Devices for absorbing waves radiated from an antenna; Combinations of such devices with active antenna elements or systems
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Abstract
The invention relates to the field of artificial electromagnetic materials in a radar communication system, in particular to a low-profile low-RCS broadband wave-absorbing metamaterial. In order to solve the problems of large unit size and narrow working frequency band, the wave-absorbing metamaterial has a three-layer structure, and sequentially comprises a loss layer, a medium substrate and a metal floor from top to bottom, wherein the loss layer consists of N multiplied by M loss layer units in an array; the loss layer unit comprises a square ring and four quarter metal circular arcs, the square ring is formed by symmetrically placing four L-shaped metal strips of which two ends are connected with rectangular metal patches and is connected into the square ring through a patch resistor, the four quarter metal circular arcs are placed at four top corners of the loss layer unit and form a complete metal circular ring with the quarter metal circular arcs of adjacent loss layer units.
Description
Technical Field
The invention relates to the field of artificial electromagnetic materials in a radar communication system, in particular to a low-profile low-RCS broadband wave-absorbing metamaterial.
Background
With the development of radar detection technology, a technology for reducing the Radar Cross Section (RCS) of a target has become a focus of research. Due to the unusual special properties of the metamaterial in nature, the metamaterial has profound significance and open development space in the technical field of anti-radar detection.
The wave absorber is a material which can effectively absorb incident electromagnetic waves and scatter and attenuate the incident electromagnetic waves, and the incident waves are converted into energy in other forms through different wave absorbing mechanisms, so that reflected waves are greatly reduced, and the purpose of reducing RCS is achieved. Conventional wave absorbers are ubiquitous: large volume, high section, poor stability, material consumption and the like. The wave absorption type metamaterial can absorb incident waves in a certain frequency band and convert the incident waves into heat energy to be lost, so that RCS of a target is greatly reduced. If the metamaterial is applied to the technology for reducing the radar scattering cross section of the antenna, good RCS reduction can be realized while the radiation performance of the antenna is kept, and therefore the research is also significant in the aspect of reducing the RCS of the antenna. However, the wave-absorbing metamaterial has the characteristics of large unit size and narrow working frequency band, so that the problem of the invention of the wave-absorbing metamaterial with both broadband and small-sized performances is still solved.
Disclosure of Invention
The invention aims to provide a low-profile low-RCS broadband wave-absorbing metamaterial aiming at the defects in the prior art, so that the unit structure of the wave-absorbing metamaterial is simplified, the metamaterial keeps a low profile, and meanwhile, a good absorption effect can be realized in a broadband range.
In order to achieve the purpose, the invention adopts the following technical scheme:
a low-profile low-RCS broadband wave-absorbing metamaterial is of a three-layer structure and sequentially comprises a loss layer, a medium substrate and a metal floor from top to bottom, wherein the loss layer is printed on the upper surface of the medium substrate, the metal floor is printed on the lower surface of the medium substrate so as to realize the radiation and RCS reduction characteristics, the loss layer is composed of N multiplied by M loss layer units in an array, and the loss layer units are arranged in the array to form a combined ring resonator so as to realize broadband wave absorption; the loss layer unit comprises a square ring and four quarter metal circular arcs, the square ring is formed by symmetrically placing four L-shaped metal strips of which two ends are connected with rectangular metal patches and is connected into the square ring through a patch resistor, the four quarter metal circular arcs are placed at four top corners of the loss layer unit and form a complete metal circular ring with the quarter metal circular arcs of adjacent loss layer units.
Further, N is more than or equal to 10, and M is more than or equal to 10.
Further, the length of each of two metal strips perpendicular to each other in the L-shaped metal strip is 1.9mm, the width of each metal strip is 0.15mm, the length of each rectangular metal patch is 0.6mm, the width of each rectangular metal patch is 0.5mm, and the length of each patch resistor is 1mm and the width of each patch resistor is 0.5 mm.
Furthermore, the radius of the inner ring of the quarter of the metal arc is 2mm, and the ring width is 0.2 mm.
Furthermore, the medium substrate is made of FR4 epoxy resin material with the dielectric constant of 4.4, the loss tangent of 0.02 and the thickness of 3.2 mm.
Further, the metal floor, the rectangular metal patch, the L-shaped metal strip and the metal ring are all made of copper.
Compared with the prior art, the invention has the following advantages:
in order to generate a plurality of resonance points, the wave-absorbing metamaterial realizes broadband absorption. The wave-absorbing metamaterial has high impedance characteristic due to the loading of the L-shaped metal strip, and generates a wave-absorbing band with a resonance frequency point of 7.6 GHz; the added four quarter metal arcs change the surface current distribution of the wave-absorbing unit at high frequency, so that a new wave-absorbing band is generated on the wave-absorbing metamaterial at the resonance frequency point of 11.7 GHz; the impedance matching between the L-shaped metal strip and the chip resistor is realized by loading the rectangular metal chip; and the addition of the chip resistor enables the low-frequency wave absorbing band to be communicated with the high-frequency wave absorbing band to form a broadband wave absorbing band, incident electromagnetic waves in the whole wave absorbing band can be effectively converted into heat energy to be dissipated, and the wave absorbing metamaterial achieves the effect of reducing RCS in broadband.
The low-profile low-RCS broadband wave-absorbing metamaterial provided by the invention can achieve the absorption rate of more than 90% in the frequency range of 7.38-13.86GHz by the combined ring resonator provided in the loss layer, has the RCS reduction of more than 10dB relative to a metal plate with the same size, covers the whole X wave band, has the whole thickness of only 3.2mm, is simple in structure and material, is easy to conform to an antenna, and is beneficial to the application of the wave-absorbing metamaterial in a commercial system.
Drawings
FIG. 1 is a schematic structural diagram of a low-profile low-RCS broadband wave-absorbing metamaterial, wherein FIG. 1a is a top view of the material, and FIG. 1b is a side view of the material;
FIG. 2 is a schematic structural diagram of a wave-absorbing metamaterial loss layer unit in the invention, wherein FIG. 2a is a top view of the loss layer unit, and FIG. 2b is a side view of the loss layer unit;
FIG. 3 shows the reflection coefficient of the wave-absorbing metamaterial loss layer unit in the invention;
FIG. 4 shows the wave absorption rate of the wave-absorbing metamaterial loss layer unit in the invention;
FIG. 5 is a comparison graph of single-station RCS results of a low-profile low-RCS broadband wave-absorbing metamaterial prepared according to an embodiment of the invention and an equal-size metal plate;
reference numbers in the figures: 1-loss layer, 2-dielectric substrate, 3-metal floor, 4-loss layer unit, 5-square ring, 6-quarter metal arc, 7-rectangular metal patch, 8-L-shaped metal strip, 9-patch resistor and 10-metal ring.
Detailed Description
Example 1
A low-profile low-RCS broadband wave-absorbing metamaterial has a three-layer structure, and sequentially comprises a loss layer 1, a medium substrate 2 and a metal floor 3 from top to bottom, wherein the loss layer 1 consists of N multiplied by M loss layer units 4 in an array; loss layer unit 4 contains a quad ring 5 and four quarter metal circular arcs 6, quad ring 5 is placed by four L shape metal strip 8 symmetries that both ends link up rectangle metal paster 7 and forms to connect into a quad ring 5 by chip resistor 9, four quarter metal circular arcs 6 are placed at four apex angles of loss layer unit 4, constitute a complete metal ring 10 with the quarter metal circular arc 6 of adjacent loss layer unit 4.
The length and the width of the loss layer unit 4 are both 10mm, N is more than or equal to 10, and M is more than or equal to 10. The length of two mutually perpendicular metal strips in the L-shaped metal strip 8 is 1.9mm, the width is 0.15mm, the length of the rectangular metal patch 7 is 0.6mm, the width of the rectangular metal patch is 0.5mm, and the length of the patch resistor 9 is 1mm, and the width of the patch resistor is 0.5 mm. The radius of the inner ring of the quarter of the metal arc 6 is 2mm, and the ring width is 0.2 mm. The medium substrate 2 is made of FR4 epoxy resin material with the dielectric constant of 4.4, the loss tangent of 0.02 and the thickness of 3.2 mm. The metal floor 3, the rectangular metal patch 7, the L-shaped metal strip 8 and the metal ring 10 are all made of copper.
FIG. 3 shows the reflection coefficient of the wave-absorbing metamaterial loss layer unit of the embodiment, and the wave-absorbing metamaterial resonates at two frequencies of 7.60GHz and 11.70 GHz. In the frequency range of 6.51-12.52GHz, the reflection coefficient S11< -10dB and the impedance bandwidth reaches 63.16%.
Fig. 4 shows the wave absorbing rate of the wave absorbing metamaterial loss layer unit of the embodiment. In the working frequency band of 6.51-12.52GHz, the wave-absorbing rate of the wave-absorbing metamaterial reaches over 90%. Two absorption peaks at 7.60GHz and 11.70 GHz.
FIG. 5 is a graph showing the comparison of the results of the single-station RCS of the low-profile low-RCS broadband wave-absorbing metamaterial and the equal-size metal plate, wherein the absorption rate of the wave-absorbing metamaterial reaches over 90% in a frequency band with a relative bandwidth of 61.01% (7.38-13.86GHz), the single-station RCS is reduced by over 10dB, the average reduction value is 18.4dB, and the absorption rate is reduced by 19dB at 7.9 GHz.
The above-described embodiments of the present invention are provided for illustrative clarity, and variations in form and detail will occur to those skilled in the art. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (6)
1. The broadband wave-absorbing metamaterial with the low profile and the low RCS is characterized in that the wave-absorbing metamaterial is of a three-layer structure and sequentially comprises a loss layer (1), a medium substrate (2) and a metal floor (3) from top to bottom, wherein the loss layer (1) is composed of N multiplied by M loss layer units (4) in an array; loss layer unit (4) contain a quad ring (5) and four quarter metal circular arcs (6), quad ring (5) are placed by four both ends linking up L shape metal strip (8) symmetry of rectangle metal paster (7) and are formed to connect into a quad ring (5) by chip resistor (9), four quarter metal circular arcs (6) are placed at four apex angles of loss layer unit (4), constitute a complete metal ring (10) with quarter metal circular arc (6) of adjacent loss layer unit (4).
2. The broadband wave-absorbing metamaterial with the low profile and the low RCS according to claim 1, wherein the length and the width of the lossy layer unit (4) are both 10mm, N is more than or equal to 10, and M is more than or equal to 10.
3. The broadband wave-absorbing metamaterial with the low profile and the low RCS according to claim 1, wherein the length and the width of each of two metal strips perpendicular to each other in the L-shaped metal strip (8) are both 1.9mm and 0.15mm, the length and the width of the rectangular metal patch (7) are 0.6mm and 0.5mm, and the length and the width of the patch resistor (9) are 1mm and 0.5 mm.
4. The broadband wave-absorbing metamaterial with low profile and low RCS according to claim 1, wherein the radius of the inner ring of the quarter of the metal arc (6) is 2mm, and the width of the inner ring is 0.2 mm.
5. The broadband wave-absorbing metamaterial with the low profile and the low RCS according to claim 1, wherein the dielectric substrate (2) is made of FR4 epoxy resin material with the dielectric constant of 4.4, the loss tangent of 0.02 and the thickness of 3.2 mm.
6. The broadband wave-absorbing metamaterial with low profile and low RCS (claimed in claim 1), wherein the metal floor (3), the rectangular metal patch (7), the L-shaped metal strip (8) and the metal ring (10) are made of copper.
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| CN107257034A (en) * | 2017-07-18 | 2017-10-17 | 东南大学 | Low-frequency range Meta Materials wave absorbing device based on high magnetic permeability |
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2021
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