CN114221139A - Band gap type wave absorbing plate with wide reflection band - Google Patents
Band gap type wave absorbing plate with wide reflection band Download PDFInfo
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- CN114221139A CN114221139A CN202210080959.5A CN202210080959A CN114221139A CN 114221139 A CN114221139 A CN 114221139A CN 202210080959 A CN202210080959 A CN 202210080959A CN 114221139 A CN114221139 A CN 114221139A
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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
- H01Q17/008—Devices for absorbing waves radiated from an antenna; Combinations of such devices with active antenna elements or systems with a particular shape
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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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Abstract
The invention discloses a band gap type wave absorption plate with a wide reflection band, which comprises a plurality of resonance units arranged in a two-dimensional array, wherein each resonance unit comprises an upper dielectric substrate, a middle dielectric substrate and a lower dielectric substrate which are sequentially arranged along the normal incidence direction of electromagnetic waves, and an air interlayer is arranged between the adjacent dielectric substrates; a metal square ring for loading a resistor is printed in the center of the upper surface of the upper medium substrate; the upper surface of the medium substrate is printed with a metal square ring with the same size as the medium substrate and a metal branch knot with a bending line connected by a resistor; the upper surface of the lower medium substrate is printed with a square metal sheet, and the lower surface of the lower medium substrate is a metal back plate; the metal square ring and the metal branch sections connected through the resistor are used as a low-frequency absorption loss layer, the metal square ring loaded with the resistor is used as a high-frequency absorption reflecting plate, and the low-frequency absorption loss layer and the high-frequency absorption reflecting plate are used for achieving low-frequency-band and high-frequency-band wave absorption at the same time. Ensures that the wide reflection band and the absorption band have good frequency selection characteristics.
Description
Technical Field
The invention relates to the technical field of electromagnetic metamaterial wave absorbers, in particular to a band-gap wave absorber with high selectivity and wide reflection band.
Background
Since the advent of the electromagnetic metamaterial, the electromagnetic characteristic of the electromagnetic metamaterial is widely applied to the design of wave-absorbing materials due to the advantage that the electromagnetic characteristic can be flexibly regulated and controlled, and the electromagnetic characteristic of the electromagnetic metamaterial is mainly determined by the structural design of the electromagnetic metamaterial rather than the material, so that the electromagnetic metamaterial wave absorber can also be called a structural electromagnetic wave absorber. Electromagnetic metamaterial wave absorbers are often used on the surfaces of various stealth platforms to absorb radar incoming waves, and are one of the most effective ways to achieve target stealth.
In the aspect of electromagnetic stealth, the stealth performance of an aircraft is mainly determined by a Radar Cross Section (RCS), specifically, a physical quantity of the echo intensity of a target object under the irradiation of Radar waves, and the smaller the RCS value of the target is, the more difficult the target is to be detected by a Radar, the stronger the stealth capability is. Frequency Selective Surface (FSS) is the most common type of electromagnetic metamaterial, has spatial filtering characteristics, and is widely used for design of transmission and reflection structures. The two common FSSs are referred to as bandpass FSS and bandstop FSS, respectively: the band-pass FSS can be used for designing a stealth antenna housing, the stealth antenna housing serves as an antenna coating layer, the antenna is transparent in an antenna working frequency band, the antenna can work normally, and outside the antenna working frequency band, the stealth antenna housing reflects incident electromagnetic waves to other directions by utilizing the shape of the stealth antenna housing, so that the out-of-band RCS of the antenna can be reduced; the band-stop FSS is generally used as an antenna reflecting plate, reflection can be provided for an antenna in a reflecting band, normal radiation capability of the antenna is guaranteed and even improved, the band-stop FSS is transparent to incident electromagnetic waves outside an antenna working frequency band, and compared with a common metal plate, the band-stop FSS serving as the antenna reflecting plate can avoid bringing remarkable increase of RCS outside a single station of the antenna. Although the traditional band-pass FSS antenna housing can reduce the single-station RCS of the antenna, due to the characteristic of out-of-band reflection, the double-station RCS of the antenna can be inevitably improved, and the existence of the antenna under a double-station radar detection system is not facilitated. For the band-stop FSS, if there is a scatterer behind the antenna, the RCS of the antenna will inevitably increase, and therefore, both FSSs have obvious disadvantages when applied to the stealth of the antenna.
Unlike conventional band-pass or band-stop FSS, an Absorptive Frequency Selection Reflector (AFSR) gives more flexibility to the antenna cloaking. The band gap type wave-absorbing plate with the absorption-reflection-absorption characteristics can be used as a reflection back plate of an antenna, the working frequency point of the antenna is designed to be positioned in the reflection band of the band gap type wave-absorbing plate, reflection can be provided for the antenna, normal work of the antenna is guaranteed, two sides of the reflection band of the wave-absorbing plate are respectively provided with a wave-absorbing band, compared with the characteristic that the band elimination FSS band is out-of-band transparent, the band gap type wave-absorbing plate with the reflection band can absorb incident electromagnetic waves, and better out-of-band RCS reduction effect is achieved.
In order to realize the band gap type wave absorbing plate, the existing method mainly comprises the steps that firstly, a wave absorbing body with a high selective reflection band gap is proposed by Meipeng in 2017, a dipole-shaped patch of a loading resistor is used as a wave absorbing structure of the wave absorbing plate, a circular groove line resonator (CSR) is added on the patch to create a reflection point, then a bar grid structure is used as a bottom plate, and another similar reflection point is designed, so that a high selective reflection band in the middle of a wave absorbing band is realized; secondly, in the AFSR with wide reflection band proposed by chenqiang et al in 2020, the structure uses a metal strip loaded with a resistor to realize absorption bands at two sides of the reflection band, and then incident electromagnetic waves are reflected by a floor to realize the AFSR with the reflection band with a relative bandwidth of more than 50%.
The prior art has at least the following defects, and most of the conventional AFSR designs are realized by destroying the absorption effect of a wave absorber on incident electromagnetic waves at a certain frequency by short-circuiting a resistor or loading a resonance structure in the wave absorbing band of the wave absorber. Due to the sensitivity of the resonant structure to frequency and the possible adverse effects between different structures of the absorber, it is difficult to realize a band gap type absorber plate having both a wide reflection band with high selectivity and a wide absorption band.
Disclosure of Invention
In order to solve the above-mentioned defects in the prior art, the present invention provides a band gap type wave absorbing plate with a high selective wide reflection band, which is used to solve the problem that the existing band gap type wave absorbing plate is difficult to realize the high selective reflection band and the wide wave absorbing band at the same time.
The invention is realized by the following technical scheme.
The invention provides a band gap type wave absorption plate with a wide reflection band, which comprises a plurality of resonance units arranged in a two-dimensional array, wherein each resonance unit comprises an upper dielectric substrate, a middle dielectric substrate and a lower dielectric substrate which are sequentially arranged along the normal incidence direction of electromagnetic waves, and an air interlayer is arranged between the adjacent dielectric substrates;
a metal square ring for loading a resistor is printed in the center of the upper surface of the upper medium substrate;
the upper surface of the medium substrate is printed with square ring metal sheets with the same size and metal branches with bending lines and connected by resistors;
the upper surface of the lower medium substrate is printed with a square metal sheet, and the lower surface of the lower medium substrate is a metal back plate;
the square ring metal sheet and the metal branch sections connected through the resistor are used as a low-frequency absorption loss layer, the metal square ring loaded with the resistor is used as a high-frequency absorption reflecting plate, and the low-frequency absorption loss layer and the high-frequency absorption reflecting plate achieve low-frequency-band and high-frequency-band wave absorption.
Preferably, the resistor is loaded in a metal square ring of the loading resistor printed in the center of the upper surface of the upper dielectric substrate, and the resistor is loaded in the middle point of each edge of the square ring.
Preferably, the upper surface of the upper dielectric substrate further includes four L-shaped metal strips printed with the same loading resistors at right angles, the resistors are loaded at two ends of each metal strip, and the L-shaped metal strip group of the loading resistors is rotationally symmetric by 90 ° with the center of the upper dielectric substrate as a rotation center.
Preferably, the L-shaped metal strip group includes two metal strips which are connected perpendicularly to each other and have the same length, and the two metal strips are perpendicular to two sides of the upper dielectric substrate respectively.
Preferably, the square-ring metal sheets with the same size and size printed on the upper surface of the medium substrate and the metal branches with the bending lines connected in a resistance manner are connected with the metal branches through four resistors, and the metal branches with the bending lines are in 90-degree rotational symmetry with the center of the medium substrate as a rotation center.
Preferably, the metal branch with the bending line comprises a first metal strip, a second metal strip and three bending parts connected to the second metal strip and the third metal strip; the first metal strip is vertical to the outer side square ring metal sheet and is connected with the outer side square ring metal sheet through a resistor; the three bending parts have the same size and are connected end to end in sequence.
Preferably, the three bending parts are bent at equal intervals and equal lengths, the first bending part, the third bending part and the second bending part are positioned at opposite sides, the outermost bending part is connected with the third metal strip, and the third metal strip is flatly attached to the edge of the medium substrate.
Preferably, the thickness of the upper dielectric substrate, the thickness of the intermediate dielectric substrate, and the thickness of the lower dielectric substrate are increased in this order.
Preferably, the thickness of the air interlayer between the upper dielectric substrate and the middle dielectric substrate is smaller than that between the middle dielectric substrate and the lower dielectric substrate.
Due to the adoption of the technical scheme, the invention has the following beneficial effects:
1. the band gap type wave absorbing plate with the high selectivity wide reflection band has a resonance unit structure formed by cascading multiple metal layers of a band gap type wave absorbing plate through a dielectric substrate, wherein the three-layer structure comprises two loss layers which are respectively responsible for low-frequency and high-frequency absorption, the low-frequency absorption is realized by using a square ring metal sheet and metal branches which are connected through a resistor, the high-frequency absorption is realized by a metal square ring loaded with the resistor, meanwhile, the low-frequency absorption loss layers and the metal floor are taken as a whole to be used as a high-frequency absorption reflecting plate, the-10 dB wave absorbing effect of 4.12-7.82GHz in a low frequency band and 12.55-17.89GHz in a high frequency band can be realized, the reflection frequency band above-3 dB is 7.69-12.55GHz, and the wide reflection band and the absorption band are ensured to have good frequency selection characteristics.
2. The bending line structure on the upper surface of the medium substrate used by the invention can be equivalent to a parallel capacitance-inductance loop, a wave-transparent frequency band can be created on the medium substrate loss layer, so that incident electromagnetic waves of the corresponding frequency band are reflected by a floor after passing through, and the large inductance effect of the bending line structure is beneficial to realizing a wide wave-transparent frequency band on the loss layer.
3. In the invention, the lower dielectric substrate structure shows an absorption characteristic at low frequency and a reflection characteristic at high frequency, and the whole structure can be regarded as a reflecting plate of a high-frequency absorption structure in the upper dielectric plate, thereby realizing the independent design of high-frequency and low-frequency absorption. The square metal sheet printed on the upper surface of the lower dielectric substrate and the metal back plate form a structure similar to AMC, so that the frequency selection characteristic of the band gap type wave-absorbing plate is improved. The first square metal sheet on the upper surface of the medium substrate can bring the effect of one more reflector for high-frequency absorption, so that the high-frequency absorption bandwidth is improved.
4. According to the invention, by optimizing each structural parameter of the resonance unit, the-10 dB wave absorption effect of 4.12-7.82GHz at a low frequency band and 12.55-17.89GHz at a high frequency band can be realized, and a flat reflection band above-3 dB is generated at 7.69-12.55GHz, so that the wide reflection band and the wide wave absorption band are ensured, and the good frequency selection characteristic is also realized.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention:
FIG. 1 is a schematic structural diagram of a band gap type wave-absorbing plate according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a resonant cell structure according to an embodiment of the present invention;
FIG. 3 is a schematic view of the top surface of a dielectric substrate according to an embodiment of the present invention;
FIG. 4 is a schematic view of the top surface of a dielectric substrate according to an embodiment of the present invention;
FIG. 5 is a schematic view of a square metal sheet printed on the upper surface of a lower dielectric substrate according to an embodiment of the present invention;
FIG. 6 is a diagram illustrating the variation of the reflection coefficient of an electromagnetic wave with the frequency of the electromagnetic wave when the electromagnetic wave is vertically incident with TE polarization according to an embodiment of the present invention;
FIG. 7 is a diagram illustrating the variation of the reflection coefficient of an electromagnetic wave with the frequency of the electromagnetic wave when the electromagnetic wave is vertically incident with TM polarization in an embodiment of the present invention;
in the figure: 1-an upper dielectric substrate; 1-1-metal square ring; a 1-2-L shaped metal strip; 1-3-a first resistance; 1-4-second resistance; 2-a first air interlayer; 3-an intermediate substrate; 4-a second air interlayer; 5-a lower dielectric substrate; 6-a first metal strip; 7-a second metal strip; 8-a first bend; 9-a second bent part; 10-a third bend; 11-a third metal strip; 12-third resistance.
Detailed Description
The present invention will now be described in detail with reference to the drawings and specific embodiments, wherein the exemplary embodiments and descriptions of the present invention are provided to explain the present invention without limiting the invention thereto.
The invention discloses a band-gap wave absorption plate with high selectivity and wide reflection band. As shown in fig. 1, the band gap type wave-absorbing plate comprises a plurality of resonance units arranged in a two-dimensional array.
As shown in fig. 2, the resonant unit includes an upper dielectric substrate 1, a middle dielectric substrate 3, and a lower dielectric substrate 5, which are arranged in sequence along a normal incidence direction of an electromagnetic wave, and an interlayer, illustratively, a first air interlayer 2 and a second air interlayer 4, is disposed between adjacent dielectric substrates.
Specifically, as shown in fig. 3, a metal square ring 1-1 loaded with a first resistor 1-3 is printed at the center of the upper surface of the upper dielectric substrate 1, and the first resistor 1-3 is loaded at the midpoint of each edge of the metal square ring. The four right-angle positions are printed with the same L-shaped metal strip 1-2 groups, the two ends of each L-shaped metal strip are loaded with the second resistors 1-4, each L-shaped metal strip group comprises two metal strips which are mutually vertically connected and have the same length, and the two metal strips are respectively perpendicular to the two sides of the dielectric slab. And the metal strip group loaded with the second resistors 1-4 is rotationally symmetrical at 90 degrees by taking the center of the dielectric substrate 1 as the rotation center.
In the embodiment of the invention, the section of the resonance unit is square, the range of the length of each side of the outer ring of the metal square ring 1-1 loaded with the first resistor is 4.7-5.7mm, the range of the width of the metal square ring is 0.2-0.5mm, the first resistors are loaded at the middle points of each side of the square ring, 4 resistors are loaded in total, and the value range of the resistance value of the loading resistor is 60-80 ohm.
The length of the L-shaped metal strip ranges from 2.2 mm to 2.8mm, the width of the L-shaped metal strip ranges from 0.3mm to 0.7mm, the two ends of the L-shaped metal strip are respectively loaded with a second resistor and connected with the two sides of the dielectric plate, and the resistance value of the loading resistor ranges from 30 ohm to 50 ohm.
Specifically, as shown in fig. 4, two square-ring metal sheets and four metal branches with bending lines are printed on the upper surface of the intermediate substrate 3, and the midpoints of the four sides of the large square-ring metal sheet on the outer side and the metal branches with bending lines are respectively and vertically connected by four resistors 12; the metal branch knot with the bending lines comprises a first metal strip 6, a second metal strip 7 and three bending parts connected with the second metal strip and a third metal strip 11; one end of the first metal strip 6 is vertical to the large square ring metal sheet at the outer side and is connected with a third resistor 12; the other end of the first metal strip 6 is connected with a second metal strip 7, the second metal strip 7 is connected with a first bending part 8, a second bending part 9 and a third bending part 10, the three bending parts are bent at equal intervals and in equal length, the first bending part 8, the third bending part 10 and the second bending part 9 are located on opposite sides, the outermost bending part is connected with a third metal strip 11, and the third metal strip is flatly attached to the edge of the medium substrate 3. And the metal branch with the bending line is rotationally symmetrical at 90 degrees by taking the center of the medium substrate 3 as a rotation center.
In the embodiment of the invention, the value range of each side length of the outer ring of the inner side square ring metal sheet is 5.7-6.7mm, and the value range of the ring width is 0.7-1.3 mm; the value range of each side length of the outer ring of the outer square ring type metal sheet is 10-11mm, and the value range of the ring width is 0.2-0.8 mm.
Wherein the length of the first metal strip 6 ranges from 1.8 mm to 2.1mm, and the width of the first metal strip 6 ranges from 0.9 mm to 1.1 mm; the length of the second metal strip 7 ranges from 2.8mm to 3.2mm, and the width of the second metal strip 7 ranges from 0.35mm to 0.45 mm; the length of the third metal strip 11 ranges from 2.8mm to 3.2mm, and the width of the third metal strip 11 ranges from 0.15 mm to 0.25 mm; the depth of the bending part ranges from 2.5mm to 2.7mm, and the width of the bending part ranges from 0.25mm to 0.35 mm.
The bending line is added to bring capacitance and inductance effects to the loss layer of the low-frequency wave absorber, the capacitance and the inductance are in parallel connection, and according to the equivalent circuit theory, the parallel capacitance and inductance loop presents infinite impedance at the resonance point of the parallel capacitance and inductance loop, so that the transparent effect of the wave absorber loss layer on incident electromagnetic waves is realized, and the large inductance effect of the bending line is beneficial to realizing a wide pass band. On the other hand, the bending line can bring an absorption resonance point for low frequency, the low frequency absorption bandwidth of the wave absorber is widened, and the frequency selectivity is enhanced. The loss layer brought by the bent line is used for passing the band of the incident electromagnetic wave, and the incident wave is reflected by the metal bottom plate after entering the wave absorber, so that the wave absorber has a reflection characteristic at high frequency.
Specifically, as shown in fig. 5, a square metal sheet is printed on the upper surface of the lower dielectric substrate 5, a full metal back plate is arranged on the lower surface of the lower dielectric substrate 5, and the square ring-shaped metal sheet and the metal back plate form a structure similar to an AMC, so that the frequency selection characteristic of the band gap type wave-absorbing plate can be improved.
The band-gap type wave absorbing plate adopts the idea of independent design of high-frequency and low-frequency absorption, a second square ring type metal sheet printed on the upper surface of a medium substrate and four metal branches with bending lines are connected by four resistors, the lower surface of a lower medium substrate is a metal bottom plate, a low-frequency wave absorbing body is integrally formed, and high frequency presents reflection characteristics; as shown in fig. 3, the size of the square ring-shaped metal strip of the loading resistor at the center of the dielectric slab is different from that of the square ring-shaped metal strip of the loading resistor at the center of the dielectric slab, and the first square ring-shaped metal strip on the upper surface of the dielectric slab can be equivalent to a series capacitance-inductance circuit, which has the characteristic of zero impedance at the resonance frequency point, has a reflective response, forms a high-frequency wave absorber together, and has high selectivity, thereby realizing the design of the band gap type wave absorbing plate with a high-selectivity wide reflection band.
In the embodiment of the invention, the side length of the square metal sheet on the upper surface of the lower dielectric substrate ranges from 10.5mm to 11.5 mm.
Interlayers arranged between the adjacent medium substrates are all air interlayers, and the side length range of the upper medium substrate, the middle medium substrate and the lower medium substrate is 20-23 mm. The upper dielectric substrate has a thickness ranging from 0.3 to 1mm, the middle dielectric substrate has a thickness ranging from 0.7 to 1.5mm, and the lower dielectric substrate has a thickness ranging from 1 to 2 mm.
The thickness of the air interlayer between the upper dielectric substrate and the middle dielectric substrate ranges from 3mm to 4.5mm, and the thickness of the air interlayer between the middle dielectric substrate and the lower dielectric substrate ranges from 5.7mm to 7.3 mm.
The beneficial effects of the present invention are now demonstrated by the following examples:
example 1
The band gap type wave absorption plate is provided with resonance units which are arranged in a 10 multiplied by 10 two-dimensional period, and the formed wave absorption plate is of a square structure.
The upper surface of the upper medium substrate is printed with a square ring type metal sheet for loading resistors, the side length of each edge of the outer ring of the square ring type metal sheet is 5.2mm, the ring width is 0.4mm, the resistors are loaded at the middle point of each edge of the square ring type metal sheet, the total number of the resistors is four, and the resistance value of the loading resistors is 70 ohm; the same L-shaped metal strip groups are printed at four right-angle positions on the upper surface of the upper dielectric substrate, each L-shaped metal strip comprises two metal strips which are mutually perpendicular and connected and have the same length, the two metal strips are respectively perpendicular to two sides of the dielectric plate, resistors are loaded at two ends of each strip, the resistance value of each loading resistor is 40ohm, the L-shaped metal strip groups of the loading resistors are in 90-degree rotational symmetry by taking the center of the upper dielectric substrate as a rotation center, and the length of each metal strip is 2.5 mm.
Two square ring type metal sheets and four metal branches with bending lines are printed on the upper surface of the medium substrate, the side length of an outer ring of a first square ring type metal sheet is 6.2mm, the ring width is 1mm, the side length of an outer ring of a second square ring type metal sheet is 10.5mm, the ring width is 0.5mm, the metal branches with the bending lines are printed on the upper surface of the medium substrate, a first metal strip is perpendicular to a second square ring type metal sheet and connected through resistors, the resistance value of the connected resistors is 400ohm, the length of the first metal strip is 1.95mm, the width of the first metal strip is 1mm, the length of a second metal strip is 3mm, the width of a second metal strip is 4mm, the length of a third metal strip is 3mm, the width is 0.2mm, the depth of a bending part is 2.6mm, and the width of the bending part is 0.3 mm.
The upper surface of the lower medium substrate is printed with a square metal sheet, and the side length of the square metal sheet is 11 mm. The lower surface of the lower medium substrate is an all-metal back plate.
The upper medium substrate, the middle medium substrate and the lower medium substrate are of square structures, the side length is set to be 21mm, the thickness of the upper medium substrate is 0.5mm, the thickness of the middle medium substrate is 1mm, the thickness of the lower medium substrate is 1.5mm, the material of the medium substrates is Rogers RT/duroid 5880(tm), and the metal material is an ideal conductor with infinite conductivity. In addition, the thickness of the air interlayer between the upper dielectric substrate and the middle dielectric substrate is 3.8mm, and the thickness of the air interlayer between the middle dielectric substrate and the lower dielectric substrate is 6.5 mm.
Based on the above band gap type wave absorption plate, when the electromagnetic wave is vertically incident with TE polarization, the graph of the change rule of the reflection coefficient of the electromagnetic wave with the frequency of the electromagnetic wave is shown in fig. 6, and when the electromagnetic wave is vertically incident with TM polarization, the graph of the change rule of the reflection coefficient of the electromagnetic wave with the frequency of the electromagnetic wave is shown in fig. 7. The wave-absorbing frequency bands below-10 dB are respectively 4.12-7.82GHz (relative bandwidth 62%) in a low frequency band and 12.55-17.89GHz (relative bandwidth 35%) in a high frequency band, a wide reflection band is arranged between the two wave-absorbing frequency bands, the reflection frequency band above-3 dB is 7.89-12.55GHz (relative bandwidth 46%), and a reflection coefficient curve shows that the wave-absorbing frequency band has good frequency selection characteristics. Due to the symmetry of the structure, the TM polarization has a substantially uniform resulting curve as shown in fig. 7.
Compared with the prior art, the band gap type wave-absorbing plate with the high-selectivity wide reflection band is designed based on the idea of independent design of high-frequency and low-frequency absorption, and has a three-layer structure comprising two loss layers which are respectively responsible for low-frequency and high-frequency absorption; secondly, low-frequency absorption is realized by using a metal square ring and a metal branch knot which are connected through a resistor, a bent line is added in the same layer, a wide pass band can be generated, and in addition, the bent line can resonate at a plurality of frequencies to widen the absorption bandwidth and improve the frequency selection selectivity of the structure; thirdly, the low-frequency absorption loss layer and the metal floor can be regarded as a whole and used as a high-frequency absorption reflection plate, so that a loss layer with two sizes of square rings with resistors at the center and the periphery is superposed and used for high-frequency absorption; in addition, a metal square ring is added on the low-frequency loss layer, so that the effect of adding one more reflector plate can be brought to high-frequency absorption, the high-frequency absorption bandwidth is improved, and the AMC structure added on the upper surface of the lower dielectric substrate can be particularly high in frequency selection characteristic of the whole structure; according to the invention, by optimizing each structural parameter of the resonance unit, the-10 dB wave absorption effect of 4.12-7.82GHz at a low frequency band and 12.55-17.89GHz at a high frequency band can be realized, and a flat reflection band above-3 dB is generated at 7.69-12.55GHz, so that the wide reflection band and absorption band are ensured, and the good frequency selection characteristic is also realized.
The present invention is not limited to the above-mentioned embodiments, and based on the technical solutions disclosed in the present invention, those skilled in the art can make some substitutions and modifications to some technical features without creative efforts according to the disclosed technical contents, and these substitutions and modifications are all within the protection scope of the present invention.
Claims (9)
1. A band gap type wave absorption plate with a wide reflection band is characterized by comprising a plurality of resonance units which are arranged in a two-dimensional array, wherein each resonance unit comprises an upper dielectric substrate, a middle dielectric substrate and a lower dielectric substrate which are sequentially arranged along the normal incidence direction of electromagnetic waves, and an air interlayer is arranged between the adjacent dielectric substrates;
a metal square ring for loading a resistor is printed in the center of the upper surface of the upper medium substrate;
the upper surface of the medium substrate is printed with square ring metal sheets with the same size and metal branches with bending lines and connected by resistors;
the upper surface of the lower medium substrate is printed with a square metal sheet, and the lower surface of the lower medium substrate is a metal back plate;
the square ring metal sheet and the metal branch sections connected through the resistor are used as a low-frequency absorption loss layer, the metal square ring loaded with the resistor is used as a high-frequency absorption reflecting plate, and the low-frequency absorption loss layer and the high-frequency absorption reflecting plate achieve low-frequency-band and high-frequency-band wave absorption.
2. The band gap type wave absorbing plate with the wide reflection band according to claim 1, wherein the resistor is loaded in a metal square ring of a loading resistor printed at the center of the upper surface of the upper dielectric substrate, and the resistor is loaded at the middle point of each side of the square ring.
3. The band gap type wave absorbing plate with the wide reflection band of claim 1, wherein the upper surface of the upper dielectric substrate further comprises four L-shaped metal strips printed with the same loading resistors at right angles, resistors are loaded at two ends of each metal strip, and the L-shaped metal strip groups of the loading resistors are rotationally symmetric by 90 ° with the center of the upper dielectric substrate as a rotation center.
4. The band gap type wave absorbing plate with a wide reflection band according to claim 3, wherein the L-shaped metal strip group comprises two metal strips which are vertically connected with each other and have equal length, and the two metal strips are respectively perpendicular to the two sides of the upper dielectric substrate.
5. The band gap type wave absorbing plate with wide reflection band of claim 1, wherein the upper surface of said middle dielectric substrate is printed with square ring metal sheets with matching size and metal branches with bending lines in resistive connection, four sides of the outer square ring metal sheet are connected with the metal branches through four resistors, and said metal branches with bending lines are in 90 ° rotational symmetry with the center of said middle dielectric substrate as the rotational center.
6. The band gap type wave absorbing plate with a wide reflection band according to claim 5, wherein the metal branch with the bending line comprises a first metal strip, a second metal strip and three bending parts connected to the second metal strip and the third metal strip; the first metal strip is vertical to the square ring metal sheet on the outer side and is connected with the square ring metal sheet through a resistor; the three bending parts have the same size and are connected end to end in sequence.
7. The broadband bandgap wave absorbing plate of claim 6, wherein the three bending portions are equally spaced and bent, the first bending portion, the third bending portion and the second bending portion are located at opposite sides, the outermost bending portion is connected to the third metal strip, and the third metal strip is attached to the edge of the middle substrate.
8. The band gap type wave absorbing plate with a wide reflection band according to claim 1, wherein the thickness of the upper dielectric substrate, the thickness of the middle dielectric substrate and the thickness of the lower dielectric substrate are increased in order.
9. The band gap wave absorbing plate with a wide reflection band of claim 1, wherein the thickness of the air interlayer between the upper dielectric substrate and the middle dielectric substrate is smaller than the thickness of the air interlayer between the middle dielectric substrate and the lower dielectric substrate.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023231027A1 (en) * | 2022-06-02 | 2023-12-07 | 华为技术有限公司 | Wave absorbing structure, antenna, radar, and terminal |
| CN117913542A (en) * | 2024-02-03 | 2024-04-19 | 北京航空航天大学 | Ultra-wideband electromagnetic absorber and electromagnetic protection device |
-
2022
- 2022-01-24 CN CN202210080959.5A patent/CN114221139A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023231027A1 (en) * | 2022-06-02 | 2023-12-07 | 华为技术有限公司 | Wave absorbing structure, antenna, radar, and terminal |
| CN117913542A (en) * | 2024-02-03 | 2024-04-19 | 北京航空航天大学 | Ultra-wideband electromagnetic absorber and electromagnetic protection device |
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