CN113329607A - Novel ultra-wideband wave absorbing unit and wave absorbing structure thereof - Google Patents
Novel ultra-wideband wave absorbing unit and wave absorbing structure thereof Download PDFInfo
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- CN113329607A CN113329607A CN202110605419.XA CN202110605419A CN113329607A CN 113329607 A CN113329607 A CN 113329607A CN 202110605419 A CN202110605419 A CN 202110605419A CN 113329607 A CN113329607 A CN 113329607A
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
- H05K9/0073—Shielding materials
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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
Abstract
The invention discloses a novel ultra-wideband wave absorbing unit and a wave absorbing structure thereof, belonging to the technical field of wave absorbing materials, wherein the wave absorbing unit comprises a magnetic wave absorbing film and a wave absorbing body arranged on the magnetic wave absorbing film; the wave absorber includes: the four first dielectric plates are vertically arranged on the magnetic wave absorption film and are spliced two by two to form a square frame body; a plurality of first metal wires are arranged on two surfaces of each first dielectric plate at equal intervals; the four second dielectric plates are arranged in the frame, and each second dielectric plate is vertically arranged on the magnetic wave absorption film; a plurality of second metal wires are arranged on two surfaces of each second dielectric plate at equal intervals; and the wave-absorbing foam is filled in each cavity. The wave absorbing unit provided by the invention has a simple structure, is processed by adopting a printed circuit board technology, has low cost, thin thickness and light weight, not only has an effect under vertical incidence, but also has a good effect under oblique incidence.
Description
Technical Field
The invention belongs to the technical field of wave-absorbing materials, and particularly relates to a novel ultra-wideband wave-absorbing unit and a wave-absorbing body structure thereof.
Background
As one of major military technological breakthroughs after the second war, the stealth technology is always a technological plateau for competition and competition of various countries in the modern informatization war, and the emergence of the stealth technology and the huge power shown in the war make the stealth technology one of the essential important marks of a new generation of combat aircrafts and continuously promote the improvement of the design and manufacturing technology of the aircrafts. Currently, the most common and effective stealth solutions can be summarized in two aspects: firstly, the appearance structure of equipment is utilized, the radar scattering Section (RCS) of equipment is reduced, and therefore the stealth purpose of a certain degree is achieved. This will inevitably affect, and even sacrifice, the aerodynamic performance of the equipment, due to the excessive reliance on the configuration of the equipment. Secondly, electromagnetic wave absorbing materials are adopted to absorb radar waves irradiated on own equipment, so that the purpose of stealth is achieved. Compared with the stealth of the appearance structure, the electromagnetic wave-absorbing material is relatively less constrained by the appearance structure and has the omnibearing stealth performance, and the electromagnetic wave-absorbing material gradually becomes an object of key research in the technical field of electromagnetic stealth in recent years.
The electromagnetic wave-absorbing material is a functional material which can effectively absorb incident electromagnetic waves so as to obviously attenuate the intensity of target echo. Generally, in order to realize efficient absorption in a microwave frequency band, particularly in a low frequency band, a radar absorbing material with a large volume or a heavy weight is often required, and the problem of the real requirement of enhancing low frequency absorption under a limited thickness is solved.
Disclosure of Invention
Aiming at the defects of insufficient wave-absorbing bandwidth, overlarge surface density and the like of the existing wave-absorbing material, the invention provides the ultra-wideband wave-absorbing material body structure, which is simple in structure, low in cost, thin in thickness and light in weight, is processed by adopting the printed circuit board technology, has the effect under the condition of vertical incidence and also has a good effect under the condition of oblique incidence.
The invention provides a novel ultra-wideband wave absorbing unit, which comprises a magnetic wave absorbing film and a wave absorbing body arranged on the magnetic wave absorbing film;
the wave absorber includes:
the four first dielectric plates are vertically arranged on the magnetic wave absorbing film and are spliced two by two to form a cubic frame body; a plurality of first metal wires are arranged on two surfaces of each first dielectric plate at equal intervals;
the four second dielectric plates are arranged in the frame, and each second dielectric plate is vertically arranged on the magnetic wave-absorbing film; the four second dielectric plates equally divide the interior of the frame body to form four cavities; a plurality of second metal wires are arranged on two surfaces of each second dielectric plate at equal intervals;
and the wave-absorbing foam is filled in each cavity.
Preferably, all the first dielectric plates are square dielectric plates with equal size.
Preferably, the lengths of the plurality of first metal wires are gradually shortened from the side where the first dielectric plate is connected with the magnetic wave-absorbing film to the side away from the magnetic wave-absorbing film.
More preferably, the midpoint of each first metal line is located at the middle line of the first dielectric plate, and a plurality of first metal lines form a trapezoidal surface structure.
More preferably, a plurality of third metal lines are arranged on two surfaces of each first dielectric plate at two sides of the tip portion of the trapezoidal surface structure from top to bottom at equal intervals along two sides of the first dielectric plate, and the lengths of the plurality of third metal lines are gradually increased.
More preferably, one end of the third metal line on the same side of the trapezoidal surface structure is equidistant from one side of the first dielectric slab.
Preferably, all the second dielectric slabs are rectangular dielectric slabs with equal size; the cross section of each cavity is square.
Preferably, the lengths of the second metal wires are gradually shortened from the side of the second dielectric plate connected with the magnetic wave-absorbing film to the side far away from the magnetic wave-absorbing film;
the midpoint of each second metal line is positioned at the middle line of the second dielectric plate;
the plurality of second metal wires form a trapezoidal surface structure.
The invention provides a novel ultra-wideband wave absorbing structure, which comprises a plurality of wave absorbing units as claimed in any one of claims 1 to 8, wherein the wave absorbing units are arranged in an array; and
and the third dielectric plate is arranged at the bottom of each magnetic wave-absorbing film, and the two surfaces of the third dielectric plate are coated with elemental copper.
Preferably, the first dielectric plate is shared between two adjacent wave absorbing units.
Compared with the prior art, the invention has the following beneficial effects:
the novel ultra-wideband wave absorbing unit provided by the invention has a simple structure, is processed by adopting a printed circuit board technology, and has the advantages of low cost, thin thickness and light weight;
the novel ultra-wideband wave absorber structure provided by the invention has the advantages of wide wave absorbing band width, low surface density and the like;
the novel ultra-wideband wave absorber structure provided by the invention has good wave absorbing effect under vertical incidence and also has good wave absorbing effect under oblique incidence;
the novel ultra-wideband wave absorber structure provided by the invention can change the wave absorbing performance of the wave absorber, such as working frequency band, bandwidth and the like, by adjusting the sizes of the metal sawtooth structure units and the length of the metal wire, and has larger design freedom.
The invention designs a wave absorbing unit, which is mainly characterized in that a plurality of metal wires are endowed on a dielectric plate, the metal wires form a trapezoidal surface similar to a metal sawtooth structure on the dielectric plate, the metal sawtooth structure has the characteristic of gradually changing the length from top to bottom, the metal sawtooth structure is vertically placed and periodically arranged, so that a hollow grid array is formed, and a strong-weak dispersion area of a dispersion curve of the metal sawtooth structure of a metamaterial is comprehensively regulated and controlled by optimizing the geometric structure size of the metal sawtooth structure, so that on one hand, good interface impedance matching of a metamaterial wave absorbing body and an air layer can be realized, and the scattering of incident electromagnetic waves on an incident interface is reduced to the greatest extent; on the other hand, the electromagnetic wave is strongly lost in the strong dispersion area, thereby achieving the purpose of high-efficiency absorption. The hollow grid array formed by the metal sawtooth structures, the magnetic wave-absorbing film and the wave-absorbing foam are combined to form the metamaterial wave-absorbing unit, and particularly, the hollow grid array is vertically arranged on the upper surface of the magnetic wave-absorbing film, so that the wave-absorbing bandwidth can be further expanded to low frequency; meanwhile, the wave absorbing foam is filled in the middle of the periodic hollow array, so that the wave absorbing bandwidth can be further expanded to high frequency.
Drawings
FIG. 1 is a schematic structural diagram of a novel ultra-wideband wave-absorbing unit provided by the invention;
fig. 1(a) is a schematic view of an overall structure of a wave absorbing unit provided in example 1;
fig. 1(b) is a schematic diagram of the wave-absorbing unit provided in example 1 with the filling foam removed in the middle;
fig. 1(c) is a front view of an arrangement structure of a first dielectric plate and first metal wires and third metal wires thereon in a wave absorbing unit provided in example 1;
fig. 1(d) is a front view of a second dielectric plate and a second metal wire thereon in the wave-absorbing unit provided in example 1.
FIG. 2 is a photograph of a novel ultra-wideband wave-absorbing structure sample according to the present invention;
wherein, fig. 2(a) is a photograph of a sample of the wave-absorbing structure provided in example 2, the sample having the dimensions of 300.0mm × 300.0mm × 30.0 mm;
fig. 2(b) is a photograph of a first dielectric plate and a first metal wire and a third metal wire sample thereon, and a second dielectric plate and a second metal wire sample thereon in the wave absorbing unit provided in example 1;
FIG. 2(c) is a photograph of a sample having dimensions of 1000.0mm by 30.0mm as provided in example 3;
fig. 2(d) is a partially enlarged photograph of fig. 2 (c).
Fig. 3 is a simulation result of the novel ultra-wideband wave-absorbing structure provided in embodiment 2 from 0.3GHz to 18.0GHz under the vertical incidence of y-polarized waves after removing the middle filling wave-absorbing foam, and the frequency band of the partial enlarged view is 0.3GHz to 2.0 GHz.
Fig. 4 is a comparison graph of simulation results of the novel ultra-wideband wave-absorbing structure provided in embodiment 2 under vertical incidence of y polarized waves after removing the middle filling wave-absorbing foam and test results of the novel ultra-wideband wave-absorbing structure provided in embodiment 2 under vertical incidence of vertical polarization, wherein the frequency bands of simulation and experiment are both 0.3GHz-18.0GHz, and the frequency band of the partial enlarged image is 0.3GHz-2.0 GHz.
Fig. 5 is a comparison graph of a simulation result of the novel ultra-wideband wave-absorbing structure provided in example 2 after removing the middle filling wave-absorbing foam under the vertical incidence of y polarized waves and a test result of the novel ultra-wideband wave-absorbing structure sample provided in example 2 under the vertical incidence of horizontal polarization, wherein the frequency bands of the simulation and the experiment are both 0.3GHz-18.0GHz, and the frequency band of the partial enlarged image is 0.3GHz-2.0 GHz.
Fig. 6 is a comparison graph of test results of a novel ultra-wideband wave-absorbing structure sample provided in example 1 under vertical polarization vertical incidence and oblique 25.0 ° incidence, where an experimental frequency band is 0.3GHz-18.0GHz, and a frequency band of a partial enlarged view is 0.3GHz-2.0 GHz.
Fig. 7 is a comparison graph of the test results of the novel ultra-wideband wave-absorbing structure provided in example 2 under horizontal polarization vertical incidence and oblique 25.0 ° incidence, where the experimental frequency band is 0.3GHz-18.0GHz, and the frequency band of the partial enlarged view is 0.3GHz-2.0 GHz.
Detailed Description
In order to make the technical solutions of the present invention better understood and implemented by those skilled in the art, the present invention is further described below with reference to the following specific embodiments and the accompanying drawings, but the embodiments are not meant to limit the present invention.
It should be noted that the experimental methods described in the following examples are all conventional methods unless otherwise specified; the materials used, unless otherwise specified, are commercially available.
The novel ultra-wideband wave absorbing unit provided by the following embodiments is shown in fig. 1, and comprises a magnetic wave absorbing film 3 and a wave absorber arranged on the magnetic wave absorbing film 3;
the wave absorber includes:
all the first dielectric slabs 1 are square dielectric slabs, are vertically arranged on the magnetic wave absorption film, and are spliced two by two to form a cubic frame body; every on the two surfaces of first dielectric slab, equally spaced is provided with a plurality of first metal cords:
the lengths of the first metal wires are gradually shortened from the side, connected with the magnetic wave absorbing film, of the first dielectric plate to the side far away from the magnetic wave absorbing film;
the midpoint of each first metal line is located at the center line of the first dielectric plate, the first metal lines form a first trapezoidal surface structure, and the height in the first trapezoidal surface structure is th127.0 mm; the first trapezoidal surface structure is a metal sawtooth structure;
the longest first metal wire has a length l225.0-30.0 mm away from the lower edge of the first dielectric plate2＝3.4mm；
The shortest length of the first metal line is l10.1-5.0 mm away from the upper edge of the first dielectric plate1＝0mm；
The length difference between the adjacent first metal wires is 0-2.0 mm;
the interval width between the adjacent first metal lines is 0.1-1.0 mm.
A plurality of third metal wires are arranged on two surfaces of each first dielectric plate and positioned on two sides of the tip part of the trapezoidal surface structure at equal intervals from top to bottom along two sides of the first dielectric plate, and the lengths of the plurality of third metal wires are gradually increased;
the longest length of the third metal line is l44.0-7.0 mm away from the lower edge of the first dielectric plate4＝17.0mm；
Shortest lengthThe length of the third metal wire is l30-3.0 mm away from the upper edge of the first dielectric plate3＝0mm；
The length difference between the adjacent third metal wires is 0-2.0 mm;
the interval width between the adjacent third metal lines is 0.1-1.0 mm.
And the distance from one end of the third metal wire positioned on the same side of the trapezoidal surface structure to one side of the first medium plate is equal and is 0-0.5 mm.
Each first dielectric plate is a square dielectric plate with the size of 25.0-30.0 mm.
The wave absorber further comprises:
four second dielectric plates 2 with equal size, wherein each second dielectric plate is a rectangular dielectric plate, is arranged in the frame body and is vertically arranged on the magnetic wave-absorbing film, the four second dielectric plates equally divide the interior of the frame body into four cavities with equal volume, and the section of each cavity is square;
a plurality of second metal wires are arranged on two surfaces of each second dielectric plate at equal intervals;
the lengths of the second metal wires are gradually shortened from the side, connected with the magnetic wave absorbing film, of the second dielectric plate to the side far away from the magnetic wave absorbing film;
the midpoint of each second metal line is positioned at the middle line of the second dielectric plate;
the second metal wires form a trapezoidal surface structure;
the longest length of the second metal line is l610.0-15.0 mm away from the lower edge of the second dielectric plate6＝14.7mm；
The length of the shortest second metal line is l53.0-8.0 mm away from the upper edge of the second dielectric plate5＝0.2mm；
The length difference between the adjacent second metal wires is 0-2.0 mm;
the interval width between the adjacent second metal lines is 0.1-1.0 mm.
Each second dielectric plate is a rectangular dielectric plate with the length of 25.0-30.0 mm and the width of 14.0-16.0 mm; and the long edge of each second dielectric plate is perpendicular to the magnetic wave-absorbing film.
The widths of the first metal wire, the second metal wire and the third metal wire are all 0.1-1.0 mm.
The first dielectric plate and the second dielectric plate are both made of epoxy resin glass fiber composite materials.
The wave absorber further comprises:
and the wave-absorbing foam 5 is filled in each cavity.
The material of the wave-absorbing foam is formed by compounding a polyurethane foam material and a carbon material.
In addition, the first metal wire, the second metal wire and the third metal wire in the wave absorbing body are all parallel to the plane where the magnetic wave absorbing film is located.
The first dielectric plate, the second dielectric plate and the third dielectric plate used in the following embodiments are all made of FR-4 material (epoxy resin glass fiber composite material), and the thicknesses thereof are th2＝0.4mm、th30.4mm and th53mm and a relative dielectric constant of epsilonrA dielectric sheet having a loss tangent tan (δ) of 0.025 at 4.3; wherein, the two surfaces of the third medium plate are coated with the elementary copper with the thickness of 18 μm.
The adopted magnetic wave-absorbing film is purchased from the new material science and technology limited of WanhuaTugu in Jiangsu, is mainly compounded by silicon rubber/chloroprene rubber and magnetic materials, and has the characteristics of thinness, flexibility, low density, high absorption and the like; it has a thickness of th4＝1.0mm。
The first metal wire, the second metal wire and the third metal wire are all made of copper materials.
The invention arranges the metal wire on the dielectric plate by the printed circuit board process.
On the premise of determining the basic structure, the optimal design of the ultra-wideband wave-absorbing material is carried out according to specific requirements, and the optimal parameters including the length, width, interval and number of a plurality of metal wires, the dielectric constant, loss and thickness of a medium substrate, the combination form and size of a periodic metal sawtooth structure and the like are determined.
Example 1
A novel ultra-wideband wave absorbing structure is shown in figures 1-2 and comprises a plurality of wave absorbing units arranged in an array;
the wave absorbing unit comprises a magnetic wave absorbing film 3 and a wave absorbing body arranged on the magnetic wave absorbing film 3;
the wave absorber includes:
the four first medium plates 1 with equal size are vertically arranged on the magnetic wave absorption film and are spliced two by two to form a cubic frame body; a plurality of first metal wires are arranged on two surfaces of each first dielectric plate at equal intervals; wherein, two adjacent first metal lines are parallel;
the lengths of the first metal wires are gradually shortened from the side, connected with the magnetic wave-absorbing film, of the first dielectric plate to the side far away from the magnetic wave-absorbing film;
the four second dielectric plates 2 with equal size are arranged in the frame body and are vertically arranged on the magnetic wave-absorbing film, and the four second dielectric plates equally divide the interior of the frame body into four cavities with equal volume; the section of each cavity is square;
a plurality of second metal wires are arranged on two surfaces of each second dielectric plate at equal intervals; the lengths of the second metal wires are gradually shortened from the side, connected with the magnetic wave-absorbing film, of the second dielectric plate to the side far away from the magnetic wave-absorbing film;
and the wave-absorbing foam 5 is filled in each cavity.
Wherein the content of the first and second substances,
the midpoint of each first metal line is located at the center line of the first dielectric plate, the first metal lines form a first trapezoidal surface structure, and the height in the first trapezoidal surface structure is th127.0 mm; the first trapezoidal surface structure is a metal sawtooth structure;
the longest first metal line has a length of l228.77mm and h from the lower edge of the first dielectric plate2＝3.4mm；
Shortest first goldThe length of the wire is l11.0mm away from the upper edge of the first dielectric plate1＝0mm；
The length difference of the adjacent first metal wires is 0.47 mm;
the interval width between the adjacent first metal lines is 0.2 mm.
A plurality of third metal wires are arranged on any surface of each first dielectric plate and positioned on two sides of the tip of the trapezoidal surface structure at equal intervals from top to bottom along two sides of the first dielectric plate, and the lengths of the plurality of third metal wires are gradually increased;
the longest third metal line has a length of l45.4mm away from the lower edge of the first dielectric plate4＝17.0mm；
The shortest third metal line has a length of l30.5mm away from the upper edge of the first dielectric plate3＝0mm；
The length difference of the adjacent third metal wires is 0.2 mm;
the interval width between the adjacent third metal lines is 0.2 mm.
And the sizes of one end of each third metal wire, which is equal to one side of the first dielectric plate, are all 0.1 mm.
Each of the first dielectric sheets is a square dielectric sheet having a size of 30.4 mm.
The midpoint of each second metal line is located at the middle line of the second dielectric plate, and the plurality of second metal lines form a second trapezoidal surface structure;
the longest second metal line has a length of l613.5mm away from the lower edge of the second dielectric plate6＝14.7mm；
The length of the shortest second metal line is l55.1mm away from the upper edge of the second dielectric plate5＝0.2mm；
The length difference of the adjacent second metal wires is 0.28 mm;
the interval width between the adjacent second metal lines is 0.2 mm.
Each second dielectric plate is a rectangular dielectric plate with the length of 27.0mm and the width of 15.0 mm; the long edge of each second dielectric plate is perpendicular to the magnetic wave-absorbing film.
The widths of the first metal wire, the second metal wire and the third metal wire are all equal to 0.2 mm.
The thicknesses of the first dielectric plate and the second dielectric plate are th respectively20.4mm and th30.4mm, and the relative dielectric constant is epsilonrA dielectric sheet having a loss tangent tan (δ) of 0.025 at 4.3;
the thickness of the magnetic wave-absorbing film is th4＝1.0mm。
Example 2
A novel ultra-wideband wave absorber structure is shown in figure 2 and comprises a plurality of wave absorbing units provided by embodiment 1, a plurality of wave absorbing unit arrays arranged, and
and the third dielectric plates are arranged at the bottom of each magnetic wave-absorbing film, and both surfaces of each third dielectric plate are coated with elemental copper with the thickness of 18 microns. Wherein the third dielectric plate has a thickness th53 mm. The size of the utility model is 300.0mm multiplied by 30.0 mm;
two adjacent wave-absorbing units share one first dielectric plate.
Example 3
A novel ultra-wideband wave absorber structure is shown in figure 2 and comprises a plurality of wave absorbing units provided by embodiment 1, a plurality of wave absorbing unit arrays arranged, and
and the third dielectric plates are arranged at the bottom of each magnetic wave-absorbing film, and both surfaces of each third dielectric plate are coated with elemental copper with the thickness of 18 microns. Wherein the third dielectric plate has a thickness th53 mm. The size is 1000.0mm multiplied by 30.0 mm;
two adjacent wave-absorbing units share one first dielectric plate.
In order to illustrate the relevant performance of the novel ultra-wideband wave absorbing unit and the wave absorber structure thereof provided by the invention, the wave absorbing structure provided in embodiment 2 and the relevant comparative example are subjected to wave absorbing performance test, which is described in fig. 3-7.
In the testing process, novel ultra-wideband wave-absorbing structures with different sizes are processed, and the overall sizes of the sample pieces are respectively 1000.0mm multiplied by 1000.0mm and 300.0mm multiplied by 300.0 mm; the wave-absorbing structure is required to work in the P-Ku wave band,
under vertical polarization: the average value of the reflection coefficient required by the P wave band is below-4 dB, the average value of the reflection coefficient required by the L wave band is below-6 dB, the average value of the reflection coefficient required by the S wave band is below-10 dB, the average value of the reflection coefficient required by the C wave band is below-14 dB, the average value of the reflection coefficient required by the X wave band is below-20 dB, and the average value of the reflection coefficient required by the Ku wave band is below-20 dB;
under horizontal polarization: the average value of the reflection coefficient required by the P wave band is below-4 dB, the average value of the reflection coefficient required by the L wave band is below-6 dB, the average value of the reflection coefficient required by the S wave band is below-20 dB, the average value of the reflection coefficient required by the C wave band is below-25 dB, the average value of the reflection coefficient required by the X wave band is below-25 dB, and the average value of the reflection coefficient required by the Ku wave band is below-25 dB.
As shown in fig. 3, the simulation result of the novel ultra-wideband wave-absorbing structure after the middle filling of the wave-absorbing foam is removed under the vertical incidence of the P-Ku wave band is as follows: the average value of the reflection coefficient of the P wave band is below-1.5 dB, the average value of the reflection coefficient of the L wave band is below-6 dB, the average value of the reflection coefficient of the S wave band is below-12 dB, the average value of the reflection coefficient of the C wave band is below-18 dB, the average value of the reflection coefficient of the X wave band is below-22 dB, and the average value of the reflection coefficient of the Ku wave band is below-13 dB.
From fig. 4, the simulation result of the novel ultra-wideband wave-absorbing structure under the vertical incidence of the y-polarized wave after the middle filling wave-absorbing foam is removed has better coincidence in the P, L, S wave band and within 10.0-12.0GHz compared with the test result of the novel ultra-wideband wave-absorbing body sample under the vertical incidence of the vertical polarization.
From fig. 5, the test results of the novel ultra-wideband wave-absorbing structure sample under horizontal polarization vertical incidence are better than the simulation results of the novel ultra-wideband wave-absorbing body under y polarization vertical incidence after the novel ultra-wideband wave-absorbing body is removed and the wave-absorbing foam is filled in the middle.
As shown in fig. 6, the novel ultra-wideband wave-absorbing structure has wave-absorbing effects at both vertical incidence and oblique 25 ° incidence of P-Ku waveband vertical polarized waves, and the specific case of vertical incidence is as follows: the average value of the reflection coefficient of the P wave band is below-4 dB, the average value of the reflection coefficient of the L wave band is below-6 dB, the average value of the reflection coefficient of the S wave band is below-10 dB, the average value of the reflection coefficient of the C wave band is below-14 dB, the average value of the reflection coefficient of the X wave band is below-20 dB, and the average value of the reflection coefficient of the Ku wave band is below-20 dB; the 25 ° oblique incidence is specifically: the average value of the reflection coefficient of the P wave band is below-2 dB, the average value of the reflection coefficient of the L wave band is below-2.4 dB, the average value of the reflection coefficient of the S wave band is below-15 dB, the average value of the reflection coefficient of the C wave band is below-15 dB, the average value of the reflection coefficient of the X wave band is below-25 dB, and the average value of the reflection coefficient of the Ku wave band is below-24 dB.
As shown in fig. 7, the novel ultra-wideband wave-absorbing structure has wave-absorbing effects at both vertical incidence and oblique 25 ° incidence of the P-Ku band horizontal polarized wave, and the specific actions under the vertical incidence are: the average value of the reflection coefficient of the P wave band is below-4 dB, the average value of the reflection coefficient of the L wave band is below-6 dB, the average value of the reflection coefficient of the S wave band is below-20 dB, the average value of the reflection coefficient of the C wave band is below-25 dB, the average value of the reflection coefficient of the X wave band is below-25 dB, and the average value of the reflection coefficient of the Ku wave band is below-25 dB; the 25 ° oblique incidence is specifically: the average value of the reflection coefficient of the P wave band is below minus 9dB, the average value of the reflection coefficient of the L wave band is below minus 8dB, the average value of the reflection coefficient of the S wave band is below minus 20dB, the average value of the reflection coefficient of the C wave band is below minus 20dB, the average value of the reflection coefficient of the X wave band is below minus 28dB, and the average value of the reflection coefficient of the Ku wave band is below minus 24 dB.
In conclusion, the novel ultra-wideband wave absorbing unit provided by the invention has the advantages of simple structure, low cost, thin thickness and light weight, and is processed by adopting the printed circuit board technology;
the novel ultra-wideband wave absorber structure provided by the invention has the advantages of wide wave absorbing band width, low surface density and the like;
the novel ultra-wideband wave absorber structure provided by the invention has good wave absorbing effect under vertical incidence and also has good wave absorbing effect under oblique incidence;
the novel ultra-wideband wave absorber structure provided by the invention can change the wave absorbing performance of the wave absorber, such as working frequency band, bandwidth and the like, by adjusting the sizes of the metal sawtooth structure units and the length of the metal wire, and has larger design freedom.
The invention adopts a method for regulating and controlling the internal magnetic field of the magnetic wave-absorbing material by utilizing Plasma Metamaterial (PM), and can enhance the magnetic field intensity of the position of the magnetic wave-absorbing material, improve the wave-absorbing performance of the whole structure and realize the high-efficiency absorption of low frequency band by regulating and controlling the local magnetic field by the metal sawtooth structure, thereby further widening the wave-absorbing bandwidth.
It should be noted that when the following claims refer to numerical ranges, it should be understood that both ends of each numerical range and any value between the two ends can be selected, and since the steps and methods used are the same as those of the embodiments, the preferred embodiments and effects thereof are described in the present invention for the sake of avoiding redundancy, but once the basic inventive concept is known, those skilled in the art may make other changes and modifications to the embodiments. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, it is intended that such changes and modifications be included within the scope of the appended claims and their equivalents.
Claims (10)
1. A novel ultra-wideband wave absorbing unit is characterized by comprising a magnetic wave absorbing film and a wave absorbing body arranged on the magnetic wave absorbing film;
the wave absorber includes:
the four first dielectric plates are vertically arranged on the magnetic wave absorbing film and are spliced two by two to form a cubic frame body; a plurality of first metal wires are arranged on two surfaces of each first dielectric plate at equal intervals;
the four second dielectric plates are arranged in the frame, and each second dielectric plate is vertically arranged on the magnetic wave-absorbing film; the four second dielectric plates equally divide the interior of the frame body to form four cavities; a plurality of second metal wires are arranged on two surfaces of each second dielectric plate at equal intervals;
and the wave-absorbing foam is filled in each cavity.
2. The novel ultra-wideband wave absorbing unit of claim 1, wherein all the first dielectric plates are square dielectric plates with equal size.
3. The novel ultra-wideband wave absorbing unit of claim 1, wherein the lengths of the plurality of first metal wires are gradually shortened from the side of the first dielectric plate connected with the magnetic wave absorbing film to the side far away from the magnetic wave absorbing film.
4. The novel ultra-wideband wave absorbing element as claimed in claim 3, wherein a midpoint of each first metal line is located at a center line of the first dielectric plate, and a plurality of first metal lines form a trapezoidal surface structure.
5. The novel ultra-wideband wave absorbing unit according to claim 3, wherein a plurality of third metal wires are disposed on two surfaces of each first dielectric plate and on two sides of the tip portion of the trapezoidal surface structure at equal intervals from top to bottom along two sides of the first dielectric plate, and the lengths of the plurality of third metal wires are gradually increased.
6. The novel ultra-wideband wave absorbing unit of claim 5, wherein one end of the third metal wire on the same side of the trapezoidal face structure is equidistant from one side of the first dielectric plate.
7. The novel ultra-wideband wave absorbing unit of claim 1, wherein all the second dielectric plates are rectangular dielectric plates with equal size; the cross section of each cavity is square.
8. The novel ultra-wideband wave absorbing unit of claim 1, wherein the lengths of the plurality of second metal wires are gradually shortened from the side of the second dielectric plate connected with the magnetic wave absorbing film to the side far away from the magnetic wave absorbing film;
the midpoint of each second metal line is positioned at the middle line of the second dielectric plate;
the plurality of second metal wires form a trapezoidal surface structure.
9. A novel ultra-wideband wave absorber structure is characterized by comprising a plurality of wave absorbing units according to any one of claims 1-8, wherein the wave absorbing units are arranged in an array; and
and the third dielectric plate is arranged at the bottom of each magnetic wave-absorbing film, and the two surfaces of the third dielectric plate are coated with elemental copper.
10. The novel ultra-wideband absorber structure of claim 9, wherein the first dielectric plate is shared between two adjacent absorbing elements.
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