CN118117338A - Ultra-wideband large-angle wave-absorbing metamaterial - Google Patents

Abstract

The invention belongs to the technical field of electromagnetic wave absorption, and particularly relates to an ultra-wideband wide-angle wave absorption metamaterial. The ultra-wideband large-angle wave-absorbing metamaterial provided by the invention comprises wave-absorbing body units which are arranged in an array; the wave absorber unit comprises a first resistance film layer, a first medium layer, a first supporting layer, a second resistance film layer, a second medium layer, a second supporting layer, a third resistance film layer, a third medium layer, a third supporting layer and a metal bottom plate which are sequentially stacked along the direction of incident waves; the resistance of the first resistance film layer, the resistance of the second resistance film layer and the resistance of the third resistance film layer decrease in sequence. The ultra-wideband large-angle wave-absorbing metamaterial provided by the invention is an electromagnetic metamaterial wave absorber which completely covers a C-Ka wave band, partially covers an S wave band and a U wave band and can effectively absorb under different incident angles; particularly, the light-absorbing material can also show ideal absorption performance under the condition of oblique incidence, and has the characteristic of angle insensitivity.

Description

Ultra-wideband large-angle wave-absorbing metamaterial

Technical Field

The invention belongs to the technical field of electromagnetic wave absorption, and particularly relates to an ultra-wideband wide-angle wave absorption metamaterial.

Background

In recent years, as electromagnetic wave absorbing technology is greatly developed, it is widely used in the military and civil fields. The wave absorber based on the metamaterial has the advantages of simple structure, light weight, high absorptivity and the like, and can realize flexible regulation and control of electromagnetic waves, so that the electromagnetic wave absorbing field is rapidly developed.

Metamaterial, also called artificial electromagnetic material, is generally formed by arraying and combining sub-wavelength structural units in a periodic or regular aperiodic mode, and has strong electromagnetic regulation and control capability, such as negative refractive index, counter-propagation, electromagnetic stealth and the like. The metamaterial wave absorber can realize perfect absorption of electromagnetic waves in a specific frequency range, and further overcomes the thickness limitation of a traditional quarter-wave device. The metamaterial wave absorber is used as an effective tool for absorbing and dissipating electromagnetic wave energy and inhibiting electromagnetic wave reflection and propagation, and is widely applied to the technical fields of electromagnetic shielding, wireless communication, imaging, radar stealth and the like. The metamaterial wave absorber uses a high-loss material or a strong resonance structure to dissipate and absorb the energy of the incident electromagnetic wave, so that the stealth performance and the electromagnetic compatibility can be improved, and the metamaterial wave absorber can be used for inhibiting electromagnetic radiation pollution.

Yuan proposes a design based on the superposition of a high-resistance film and air in Research on Low Frequency Broadband Wave Absorbers Based on Electromagnetic Metamateri, so that the wave absorber has the characteristics of light weight, insensitivity to polarization, insensitivity to angle and the like, but the absorption performance of the wave absorber in a specific absorption frequency band can reach about 90%, and the insensitivity to angle is narrower; jiang proposes a graphene-based electromagnetic metamaterial in 'An ultra-wideband absorber based on graphene', which has the characteristics of ultra-wideband and unclear polarization, but has better absorption performance only on high-frequency electromagnetic waves.

Disclosure of Invention

The invention aims to provide the ultra-wideband wide-angle wave-absorbing metamaterial, which can widen the frequency band, realize insensitivity under multi-angle incidence and has the characteristics of wide frequency band and insensitive polarization angle.

In order to achieve the above object, the present invention provides the following technical solutions:

The invention provides an ultra-wideband large-angle wave-absorbing metamaterial which comprises wave-absorbing body units arranged in an array; the wave absorber unit comprises a first resistance film layer, a first medium layer, a first supporting layer, a second resistance film layer, a second medium layer, a second supporting layer, a third resistance film layer, a third medium layer, a third supporting layer and a metal bottom plate which are sequentially stacked along the direction of incident waves;

The pattern of the first resistor film layer is a first square with a first cross hollowed-out part inside, the center of the first cross hollowed-out part is coincident with the center of the first square, and the 4 open ends of the first cross hollowed-out part are positioned at the centers of the 4 sides of the first square;

the pattern of the second resistance film layer is a second square;

The pattern of the third resistance film layer comprises a circle with a second hollow-out shape, and a first circular ring, a second circular ring, a third circular ring and a fourth circular ring which are sequentially distributed on the periphery of the circle and coaxial with the circle; the center of the twenty-first hollow is coincident with the center of the circle, and the 4 opening ends of the twenty-first hollow are positioned on the circumference of the circle;

the resistance of the first resistance film layer, the resistance of the second resistance film layer and the resistance of the third resistance film layer decrease in sequence.

Preferably, the wave absorber units are arranged in an m×n rectangular array; m and N are positive integers more than or equal to 2;

The first dielectric layer, the second dielectric layer and the third dielectric layer are made of polyester;

The first supporting layer, the second supporting layer and the three supporting layers are made of rigid foam plastics.

Preferably, the resistance value of the first resistance film layer is 230Ω; the width of the transverse edge and the width of the vertical edge of the first cross hollowed-out are equal, the side length of the first square is 13mm, and the width of the transverse edge and the width of the vertical edge of the first cross hollowed-out are 1.65mm.

Preferably, the resistance value of the second resistance film layer is 150Ω; the side length of the second square is 12mm.

Preferably, the resistance value of the third resistance film layer is 10Ω; the width of the transverse edge and the width of the vertical edge of the twenty-first hollow are equal, the radius of the circle is 3.1mm, and the width of the transverse edge and the width of the vertical edge of the twenty-first hollow are 1.65mm;

The outer diameters of the first circular ring, the second circular ring, the third circular ring and the fourth circular ring are 6.9mm, 5.6mm, 4.6mm and 3.9mm in sequence; the inner diameters of the first circular ring, the second circular ring, the third circular ring and the fourth circular ring are 5.9mm, 4.9mm, 4.2mm and 3.8mm in sequence.

Preferably, the materials of the first dielectric layer, the second dielectric layer and the third dielectric layer are polyethylene terephthalate; the relative dielectric constant was 3.0 and loss tangent was 0.061.

Preferably, the first support layer, the second support layer and the three support layers are made of polymethacrylimide foam; the relative dielectric constant was 1.05 and loss tangent was 0.001.

Preferably, the length×width of the first dielectric layer, the second dielectric layer and the third dielectric layer is 14mm×14mm; the thickness is 0.175mm;

The length multiplied by the width of the first supporting layer, the second supporting layer and the three supporting layers is 14mm multiplied by 14mm; the thickness of the first supporting layer is 3mm; the thickness of the second supporting layer and the three supporting layers is 4mm.

Preferably, the metal base plate is a copper plate with a thickness of 0.018mm.

Preferably, the first resistive film layer is printed on the first dielectric layer, and the distances between the four sides of the first square and the edge of the first dielectric layer are 0.5mm;

The second resistance film layer is printed on the second dielectric layer, and the distances between the four sides of the second square and the edge of the second dielectric layer are 1mm;

The third resistor film layer is printed on the third dielectric layer, and the center of the circle coincides with the center of the second dielectric layer;

the center of the first square, the center of the second square and the center of the circle are coaxial, and the transverse edge of the first cross hollow is parallel to the transverse edge of the second cross hollow.

The invention provides an ultra-wideband large-angle wave-absorbing metamaterial which comprises wave-absorbing body units arranged in an array; the wave absorber unit comprises a first resistance film layer, a first medium layer, a first supporting layer, a second resistance film layer, a second medium layer, a second supporting layer, a third resistance film layer, a third medium layer, a third supporting layer and a metal bottom plate which are sequentially stacked along the direction of incident waves; the pattern of the first resistor film layer is a first square with a first cross hollowed-out part inside, the center of the first cross hollowed-out part is coincident with the center of the first square, and the 4 open ends of the first cross hollowed-out part are positioned at the centers of the 4 sides of the first square; the pattern of the second resistance film layer is a second square; the pattern of the third resistance film layer comprises a circle with a second hollow-out shape, and a first circular ring, a second circular ring, a third circular ring and a fourth circular ring which are sequentially distributed on the periphery of the circle and coaxial with the circle; the center of the twenty-first hollow is coincident with the center of the circle, and the 4 opening ends of the twenty-first hollow are positioned on the circumference of the circle; the resistance of the first resistance film layer, the resistance of the second resistance film layer and the resistance of the third resistance film layer decrease in sequence. The ultra-wideband large-angle wave-absorbing metamaterial provided by the invention is based on the electromagnetic loss characteristic of the resistive film, the resistance of three resistive film layers is gradually reduced along the direction of incident waves, and meanwhile, 3 resistive films with special symmetrical shapes, 3 dielectric layers and 3 supporting layers are laminated together according to the sequence to form a multi-layer resistive film-dielectric composite structure, so that impedance matching is achieved, the absorption bandwidth is effectively widened for an S wave band and a U wave band, and broadband absorption is realized at the same time, so that the ultra-wideband wave-absorbing metamaterial has better broadband characteristics. The invention also realizes polarization insensitivity by adopting the periodically symmetrical structure.

In conclusion, the ultra-wideband large-angle wave-absorbing metamaterial provided by the invention is an electromagnetic metamaterial wave absorber which completely covers a C-Ka wave band, partially covers an S wave band and a U wave band and can effectively absorb under different incident angles; particularly, the ultra-wideband large-angle wave-absorbing metamaterial provided by the invention can show ideal absorption performance under the oblique incidence condition and has the characteristic of angle insensitivity. The results of the examples show that: the ultra-wideband large-angle wave-absorbing metamaterial provided by the invention realizes that the absorptivity in the frequency band of 2.29-31.91 GHz reaches 90%; within the operating bandwidth, exhibits polarization insensitivity characteristics to TE and TM wave incidence; the incident angle of electromagnetic waves changes within 0-45 degrees, and the absorptivity of the ultra-wideband large-angle wave-absorbing metamaterial is higher than 80 percent; the ultra-wideband large-angle wave-absorbing metamaterial has the reflection loss smaller than-10 dB and the absorption bandwidth as high as 29.6GHz (2.3-31.9 GHz) under the condition that the total thickness is 11.543 mm.

Meanwhile, the ultra-wideband large-angle wave-absorbing metamaterial provided by the invention has the advantages of simple structure, compact size, easiness in processing and low manufacturing cost.

Drawings

FIG. 1 is a schematic diagram of a wave absorber unit of an ultra wideband wide angle wave absorbing metamaterial provided in an embodiment of the present invention;

in fig. 1: 1 is a first resistance film layer, 2 is a second resistance film layer, 3 is a third resistance film layer, 4 is a first dielectric layer, 5 is a second dielectric layer, 6 is a third dielectric layer, 7 is a first supporting layer, 8 is a second supporting layer, 9 is a third supporting layer, and 10 is a metal bottom plate;

FIG. 2 is a schematic structural diagram of a first resistive film layer of a wave absorber unit of an ultra wideband wide angle wave absorbing metamaterial provided in an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of a second resistive film layer of a wave absorber unit of an ultra wideband wide angle wave absorbing metamaterial provided in an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of a third resistive film layer of a wave absorber unit of an ultra wideband wide angle wave absorbing metamaterial provided in an embodiment of the present invention;

In fig. 4: 3-1 is a first circular ring, 3-2 is a second circular ring, 3-3 is a third circular ring, 3-4 is a fourth circular ring, and 3-5 is circular;

FIG. 5 is a simulation S parameter diagram of a wave absorber unit of the ultra wideband wide angle wave absorbing metamaterial provided in the embodiment of the invention;

FIG. 6 is a simulation S parameter diagram of different angles of a wave absorber unit of the ultra wideband large-angle wave absorbing metamaterial provided by the embodiment of the invention in a TE wave mode;

fig. 7 is a simulation S parameter diagram of different angles of a wave absorber unit of the ultra wideband large angle wave absorbing metamaterial provided in the embodiment of the present invention in a TM wave mode.

Detailed Description

The invention provides an ultra-wideband large-angle wave-absorbing metamaterial which comprises wave-absorbing body units arranged in an array; the wave absorber unit comprises a first resistance film layer, a first medium layer, a first supporting layer, a second resistance film layer, a second medium layer, a second supporting layer, a third resistance film layer, a third medium layer, a third supporting layer and a metal bottom plate which are sequentially stacked along the direction of incident waves;

The pattern of the first resistor film layer is a first square with a first cross hollowed-out part inside, the center of the first cross hollowed-out part is coincident with the center of the first square, and the 4 open ends of the first cross hollowed-out part are positioned at the centers of the 4 sides of the first square;

the pattern of the second resistance film layer is a second square;

The pattern of the third resistance film layer comprises a circle with a second hollow-out shape, and a first circular ring, a second circular ring, a third circular ring and a fourth circular ring which are sequentially distributed on the periphery of the circle and coaxial with the circle; the center of the twenty-first hollow is coincident with the center of the circle, and the 4 opening ends of the twenty-first hollow are positioned on the circumference of the circle;

the resistance of the first resistance film layer, the resistance of the second resistance film layer and the resistance of the third resistance film layer decrease in sequence.

In the present invention, all preparation materials/components are commercially available products well known to those skilled in the art unless specified otherwise.

The ultra-wideband large-angle wave-absorbing metamaterial provided by the invention comprises wave-absorbing body units which are arranged in an array. In the invention, the array arrangement mode of the wave absorber units is preferably an M multiplied by N rectangular array; m and N are each preferably positive integers of > 2.

Fig. 1 is a schematic structural diagram of a wave absorber unit of the ultra-wideband wide-angle wave absorbing metamaterial provided by the invention. The wave absorber unit according to the present invention will be described in detail with reference to fig. 1.

In the present invention, the surface of each layer structure of the wave absorber unit that receives an incident wave is defined as the front surface of the layer.

Along the direction of the incident wave, the wave absorber unit comprises a first resistance film layer. The surface of the incident wave entering the first resistive film layer is defined as the front surface of the first resistive film layer. In the invention, as shown in fig. 2, the pattern of the first resistive film layer is a first square with a first cross hollow inside, the center of the first cross hollow coincides with the center of the first square, and the 4 open ends of the first cross hollow are positioned at the centers of the 4 sides of the first square. The transverse edges and the vertical edges of the first cross hollowed-out parts are perpendicular to each other. The width of the transverse edge and the vertical edge of the first cross hollowed-out part is preferably equal. The side length of the first square is preferably 13mm, and the width (denoted by a2 in fig. 2) of the transverse side and the vertical side of the first cross hollowed-out part is 1.65mm. The first cross hollowed-out part divides the first square into four square units which are arranged in a two-by-two array, and the side length (denoted by a3 in fig. 2) of each square unit is 5.675mm. In the present invention, the resistance of the first resistive film layer is preferably 230Ω. The first resistance film layer is made of a commercially available product.

Along the direction of the incident wave, the wave absorber unit comprises a first dielectric layer which is laminated on the back surface of the first resistance film layer. In the present invention, the material of the first dielectric layer is preferably polyester, in particular polyethylene terephthalate (polyethylene terephthalat, PET). The relative dielectric constant of the first dielectric layer is preferably 3.0, and the loss tangent is preferably 0.061. The length x width of the first dielectric layer is preferably 14mm x 14mm; the thickness is preferably 0.175mm.

In the invention, the first resistive film layer is printed on the first dielectric layer. The four sides of the first square are preferably 0.5mm from the edge of the first dielectric layer (denoted a1 in fig. 2).

The wave absorber unit includes a first support layer laminated on the back surface of the first dielectric layer along the direction of the incident wave. In the present invention, the material of the first support layer is preferably a rigid foam, and particularly preferably a polymethacrylimide foam (polymethacrylimide, PMI). The relative dielectric constant of the first support layer is preferably 1.05, and the loss tangent is preferably 0.001. The length x width of the first support layer is preferably 14mm x 14mm; the thickness of the first support layer is preferably 3mm.

The wave absorber unit includes a second resistive film layer laminated on the back surface of the first support layer along the direction of the incident wave. In the present invention, as shown in fig. 3, the pattern of the second resistive film layer is a second square. The side length of the second square is 12mm. The resistance value of the second resistance film layer is preferably 150Ω. The second resistance film layer is made of commercial products.

Along the direction of the incident wave, the wave absorber unit comprises a second dielectric layer which is laminated on the back surface of the second resistance film layer. In the present invention, the material of the second dielectric layer is preferably polyester, and particularly preferably polyethylene terephthalate (polyethylene terephthalat, PET). The relative dielectric constant of the second dielectric layer is preferably 3.0, and the loss tangent is preferably 0.061. The length x width of the second dielectric layer is preferably 14mm x 14mm; the thickness is preferably 0.175mm;

in the present invention, the second resistive film layer is preferably printed on the second dielectric layer. The four sides of the second square are preferably 1mm from the edge of the second dielectric layer (denoted b1 in fig. 3).

The wave absorber unit includes a second support layer laminated on the back surface of the second dielectric layer along the direction of the incident wave. In the present invention, the material of the second support layer is preferably a rigid foam, and particularly preferably a polymethacrylimide foam (polymethacrylimide, PMI). The relative dielectric constant of the second support layer is preferably 1.05, and the loss tangent is preferably 0.001. The length x width of the second support layer is preferably 14mm x 14mm; the thickness of the second support layer is preferably 4mm.

The wave absorber unit includes a third resistive film layer laminated on the back surface of the second support layer along the direction of the incident wave. In the invention, as shown in fig. 4, the pattern of the third resistive film layer comprises a circle with a second hollow-out shape, and a first circular ring, a second circular ring, a third circular ring and a fourth circular ring which are sequentially distributed on the periphery of the circle and coaxial with the circle; the center of the second cross-shaped hollow is coincident with the center of the circle, and the 4 opening ends of the second cross-shaped hollow are located on the circumference of the circle. The width of the transverse edge and the width of the vertical edge of the twenty-first hollow are preferably equal. The horizontal edge and the vertical edge of the second cross-shaped hollowed-out part are perpendicular to each other. The radius of the round shape is preferably 3.1mm, and the width of the transverse edge and the vertical edge of the twenty-first hollow is 1.65mm; the outer diameters of the first circular ring, the second circular ring, the third circular ring and the fourth circular ring are preferably 6.9mm, 5.6mm, 4.6mm and 3.9mm in sequence; the inner diameters of the first circular ring, the second circular ring, the third circular ring and the fourth circular ring are preferably 5.9mm, 4.9mm, 4.2mm and 3.8mm in sequence. In the present invention, the resistance of the third resistive film layer is 10Ω. The first resistance film layer is made of a commercially available product.

In the invention, the resistance of the first resistance film layer, the resistance of the second resistance film layer and the resistance of the third resistance film layer decrease in sequence. The difference between the resistance of the first resistive film layer and the resistance of the second resistive film layer is preferably 80 to 100 Ω, and more preferably 80 Ω. The difference between the resistance of the second resistive film layer and the resistance of the third resistive film layer is preferably 100 to 140 Ω, and more preferably 140 Ω.

Along the direction of the incident wave, the wave absorber unit comprises a third dielectric layer which is laminated on the back surface of the third resistance film layer. In the present invention, the material of the third dielectric layer is preferably polyester, and particularly preferably polyethylene terephthalate (polyethylene terephthalat, PET). The relative dielectric constant of the third dielectric layer is preferably 3.0, and the loss tangent is preferably 0.061. The length x width of the third dielectric layer is preferably 14mm x 14mm; the thickness is preferably 0.175mm.

In the present invention, the third resistive film layer is preferably printed on the third dielectric layer. The center of the circle coincides with the center of the second dielectric layer.

In the present invention, the center of the first square, the center of the second square, and the center of the circle are preferably coaxial. The transverse edge of the first cross hollow is parallel to the transverse edge of the second cross hollow.

The wave absorber unit includes a third support layer laminated on the back surface of the third dielectric layer along the direction of the incident wave. In the present invention, the material of the third support layer is preferably a rigid foam, and particularly preferably a polymethacrylimide foam (polymethacrylimide, PMI). The relative dielectric constant of the third support layer is preferably 1.05, and the loss tangent is preferably 0.001. The length x width of the three support layers is preferably 14mm x 14mm; the thickness of the three support layers is preferably 4mm.

The wave absorber unit includes a metal base plate laminated on the back surface of the third support layer along the direction of the incident wave. In the invention, the metal bottom plate is a metal grounding plate. The metal base plate is preferably a copper plate, preferably 0.018mm thick.

The technical solutions provided by the present invention are described in detail below in conjunction with examples for further illustrating the present invention, but they should not be construed as limiting the scope of the present invention.

Example 1

As shown in fig. 1, the embodiment provides a wave absorber unit of ultra-wideband wide-angle wave absorbing metamaterial, which consists of a three-layer dielectric-resistor film structure and a metal grounding plate. The first layer medium-resistor film structure comprises a first resistor film layer 1 with a hollowed cross square shape, a first PET medium layer 4 and a first PMI supporting layer 7; the second dielectric-resistive film structure comprises a square second resistive film layer 2, a second PET dielectric layer 5 and a second PMI supporting layer 8; the third medium-resistor film structure comprises a third resistor film layer 3, a third PET medium layer 6 and a third PMI supporting layer 9 which are four-ring hollow cross-shaped. The relative dielectric constant of the three PMI support layers was 1.05 and the tangent loss was 0.001. The relative dielectric constant of the three PET dielectric layers was 3.0 and the tangent loss was 0.061. The thicknesses of the first PMI supporting layer 7, the second PMI supporting layer 8 and the third PMI supporting layer 9 are respectively 3mm, 4mm and 4mm; the thicknesses of the first PET medium layer 4, the second PET medium layer 5 and the third PET medium layer 6 are all 0.175mm; the thickness of the copper metal grounding plate is 0.018mm.

As shown in fig. 2, the first resistive film layer 1 is obtained by subtracting a hollowed-out cross from a square with a size of 13×13mm, the hollowed-out cross has a width of 1.65mm, and the resistance value of the first resistive film layer 1 is 230Ω.

As shown in fig. 3, the second resistive film layer 2 has a square shape of 12×12mm and a resistance value of 150Ω.

As shown in FIG. 4, the third resistive film layer 3 is composed of four circular rings (a first circular ring 3-1, a second circular ring 3-2, a third circular ring 3-3, a fourth circular ring 3-4 and a circular ring 3-5 with a cross hollow, wherein the outer diameters of the four circular rings are 6.9mm, 5.6mm, 4.6mm and 3.9mm respectively, the inner diameters are 5.9mm, 4.9mm, 4.2mm and 3.8mm, the radius of the circular ring 3-5 is 3.1mm, the width of the hollow cross is 1.65mm, and the resistance value of the third resistive film layer 3 is 10Ω.

Fig. 5 is a diagram showing S parameters of a wave absorber unit of the ultra wideband wide angle wave absorbing metamaterial in this embodiment, where the abscissa represents frequency and the ordinate represents S parameters in dB. As can be seen from FIG. 5, the absorption rate of the wave absorber unit of the ultra-wideband wide-angle wave absorbing metamaterial reaches 90% at 2.29-31.91 GHz in the embodiment.

Fig. 6 is a diagram showing S parameters of different angles of a wave absorber unit of the ultra wideband wide angle wave absorbing metamaterial in the embodiment in a TE wave mode, wherein the abscissa represents frequency, and the ordinate represents S parameters in dB. As can be seen from fig. 6, in the TE wave mode, when the incident angle changes from 0 ° to 45 °, the absorption rate of the wave absorber unit of the ultra-wideband high-angle wave absorbing metamaterial in this embodiment reaches 90% at 2.36 to 31.91 GHz.

Fig. 7 is a diagram showing S parameters of different angles of a wave absorber unit of the ultra wideband wide angle wave absorbing metamaterial in the embodiment under TM wave mode, wherein the abscissa represents frequency, and the ordinate represents S parameters in dB. As can be seen from fig. 7, in the TM wave mode, when the incident angle changes from 0 ° to 45 °, the absorption rate of the wave absorber unit of the ultra-wideband high-angle wave absorbing metamaterial in this embodiment reaches 80% at 2.58 to 31.91 GHz.

The embodiment shows that the ultra-wideband wide-angle wave-absorbing metamaterial is provided based on a multilayer resistive film-medium composite structure. The metamaterial wave absorber consists of three layers of resistor films, mediums and a metal grounding plate. The resistance of the resistor film is gradually reduced from top to bottom, and the multilayer structure design effectively widens the absorption bandwidth to the S wave band and the U wave band. The ultra-wideband large-angle wave-absorbing metamaterial provided by the invention has the following advantages: 1) The absorptivity is higher than 90% in the frequency band of 2.29-31.91 GHz, so that broadband absorption is realized; 2) Within the operating bandwidth, exhibits a planned insensitivity to TE and TM wave incidence; 3) The incident angle of electromagnetic wave is changed within 0-45 deg. and the absorptivity of wave absorber is higher than 80%.

Although the foregoing embodiments have been described in some, but not all embodiments of the invention, other embodiments may be obtained according to the present embodiments without departing from the scope of the invention.

Claims (10)

1. An ultra-wideband large-angle wave-absorbing metamaterial is characterized by comprising wave-absorbing body units which are arranged in an array; the wave absorber unit comprises a first resistance film layer, a first medium layer, a first supporting layer, a second resistance film layer, a second medium layer, a second supporting layer, a third resistance film layer, a third medium layer, a third supporting layer and a metal bottom plate which are sequentially stacked along the direction of incident waves;

The pattern of the first resistor film layer is a first square with a first cross hollowed-out part inside, the center of the first cross hollowed-out part is coincident with the center of the first square, and the 4 open ends of the first cross hollowed-out part are positioned at the centers of the 4 sides of the first square;

the pattern of the second resistance film layer is a second square;

The pattern of the third resistance film layer comprises a circle with a second hollow-out shape, and a first circular ring, a second circular ring, a third circular ring and a fourth circular ring which are sequentially distributed on the periphery of the circle and coaxial with the circle; the center of the twenty-first hollow is coincident with the center of the circle, and the 4 opening ends of the twenty-first hollow are positioned on the circumference of the circle;

the resistance of the first resistance film layer, the resistance of the second resistance film layer and the resistance of the third resistance film layer decrease in sequence.

2. The ultra-wideband wide-angle wave-absorbing metamaterial according to claim 1, wherein the wave-absorbing body units are arranged in an M x N rectangular array; m and N are positive integers more than or equal to 2;

The first dielectric layer, the second dielectric layer and the third dielectric layer are made of polyester;

The first supporting layer, the second supporting layer and the three supporting layers are made of rigid foam plastics.

3. The ultra-wideband wide-angle wave-absorbing metamaterial according to claim 1 or 2, wherein the resistance value of the first resistive film layer is 230Ω; the width of the transverse edge and the width of the vertical edge of the first cross hollowed-out are equal, the side length of the first square is 13mm, and the width of the transverse edge and the width of the vertical edge of the first cross hollowed-out are 1.65mm.

4. The ultra-wideband wide-angle wave-absorbing metamaterial according to claim 1 or 2, wherein the resistance value of the second resistive film layer is 150Ω; the side length of the second square is 12mm.

5. The ultra-wideband wide-angle wave-absorbing metamaterial according to claim 1 or 2, wherein the resistance value of the third resistive film layer is 10Ω; the width of the transverse edge and the width of the vertical edge of the twenty-first hollow are equal, the radius of the circle is 3.1mm, and the width of the transverse edge and the width of the vertical edge of the twenty-first hollow are 1.65mm;

The outer diameters of the first circular ring, the second circular ring, the third circular ring and the fourth circular ring are 6.9mm, 5.6mm, 4.6mm and 3.9mm in sequence; the inner diameters of the first circular ring, the second circular ring, the third circular ring and the fourth circular ring are 5.9mm, 4.9mm, 4.2mm and 3.8mm in sequence.

6. The ultra-wideband wide-angle wave-absorbing metamaterial according to claim 1 or 2, wherein the materials of the first dielectric layer, the second dielectric layer and the third dielectric layer are polyethylene terephthalate; the relative dielectric constant was 3.0 and loss tangent was 0.061.

7. The ultra-wideband high-angle wave-absorbing metamaterial according to claim 1 or 2, wherein the materials of the first support layer, the second support layer and the three support layers are polymethacrylimide foam; the relative dielectric constant was 1.05 and loss tangent was 0.001.

8. The ultra-wideband wide angle wave absorbing metamaterial according to claim 1, wherein the length x width of the first, second and third dielectric layers is 14mm x 14mm; the thickness is 0.175mm;

The length multiplied by the width of the first supporting layer, the second supporting layer and the three supporting layers is 14mm multiplied by 14mm; the thickness of the first supporting layer is 3mm; the thickness of the second supporting layer and the three supporting layers is 4mm.

9. The ultra-wideband wide-angle wave-absorbing metamaterial according to claim 1 or 2, wherein the metal base plate is a copper plate with a thickness of 0.018mm.

10. The ultra-wideband wide angle wave absorbing metamaterial according to claim 1 or 8, wherein the first resistive film layer is printed on the first dielectric layer, and the four sides of the first square are 0.5mm away from the edge of the first dielectric layer;

The second resistance film layer is printed on the second dielectric layer, and the distances between the four sides of the second square and the edge of the second dielectric layer are 1mm;

The third resistor film layer is printed on the third dielectric layer, and the center of the circle coincides with the center of the second dielectric layer;

the center of the first square, the center of the second square and the center of the circle are coaxial, and the transverse edge of the first cross hollow is parallel to the transverse edge of the second cross hollow.