CN113394571A - Interdigital stepped resonance structure and wave absorber of low-frequency electromagnetic wave - Google Patents
Interdigital stepped resonance structure and wave absorber of low-frequency electromagnetic wave Download PDFInfo
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- CN113394571A CN113394571A CN202110817977.2A CN202110817977A CN113394571A CN 113394571 A CN113394571 A CN 113394571A CN 202110817977 A CN202110817977 A CN 202110817977A CN 113394571 A CN113394571 A CN 113394571A
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Abstract
The invention provides an interdigital stepped resonance structure and a wave absorber of low-frequency electromagnetic waves, wherein the interdigital stepped resonance structure comprises: the first stepped structure, the interdigital structure and the second stepped structure are connected in sequence; the first ladder structure and the second ladder structure respectively comprise a plurality of ladder units which are connected in sequence; the heights of the plurality of step units in the first step structure are sequentially reduced along the direction pointing to the interdigital structure; the heights of the plurality of ladder units in the second ladder structure are sequentially reduced along the direction pointing to the interdigital structure. According to the invention, the interdigital stepped resonance structure is arranged, so that the absorption efficiency of low-frequency electromagnetic waves can be improved.
Description
Technical Field
The invention relates to the technical field of electromagnetic wave absorption, in particular to an interdigital stepped resonance structure and a wave absorber of low-frequency electromagnetic waves.
Background
The metamaterial is a novel sub-wavelength artificial composite structure or composite material with special properties which are not available in the nature. With the development of science and technology, the application field of the metamaterial is continuously widened, wherein the metamaterial wave absorber is taken as an important application of the research of the metamaterial, and the metamaterial wave absorber draws wide attention. At present, researchers have proposed many medium-frequency wave-absorbing metamaterials, and although these structures show good absorption performance when absorbing medium-frequency and high-frequency electromagnetic waves, the absorption efficiency of low-frequency electromagnetic waves is still very low.
Disclosure of Invention
The invention aims to provide an interdigital stepped resonance structure and a wave absorber of low-frequency electromagnetic waves, which can improve the absorption efficiency of the low-frequency electromagnetic waves.
In order to achieve the purpose, the invention provides the following scheme:
an interdigitated stepped resonant structure comprising:
the first stepped structure, the interdigital structure and the second stepped structure are connected in sequence;
the first step structure and the second step structure respectively comprise a plurality of step units which are connected in sequence;
the heights of the plurality of step units in the first step structure are sequentially reduced along the direction pointing to the interdigital structure; the heights of the plurality of ladder units in the second ladder structure are sequentially reduced along the direction pointing to the interdigital structure.
Optionally, the step unit specifically includes;
the device comprises a first vertical plate, a first horizontal plate, a second vertical plate and a second horizontal plate;
the first end of the first vertical plate is connected with the first end of the first horizontal plate;
the second end of the first horizontal plate is connected with the first end of the second vertical plate; the first vertical plate and the second vertical plate are both perpendicular to the first horizontal plate and connected with the lower surface of the first horizontal plate; the first vertical plate is parallel to the second vertical plate; the first vertical plate and the second vertical plate are equal in height;
the second end of the second vertical plate is connected with the first end of the second horizontal plate; the second horizontal plate is parallel to the first horizontal plate;
the second end of the first vertical plate is connected with the second end of a second horizontal plate in a first adjacent step unit of the step unit; the first adjacent step unit is an adjacent step unit far away from the interdigital structure;
the second end of the second horizontal plate is connected with the second end of the first vertical plate in the second adjacent step unit of the step unit; the second adjacent step unit is an adjacent step unit close to the interdigital structure.
Optionally, the interdigital structure specifically includes:
a third vertical plate, a fourth vertical plate, a third horizontal plate, a fourth horizontal plate, a fifth horizontal plate, a first multi-projection structure and a second multi-projection structure;
the first end of the third vertical plate is connected with the second end of the second horizontal plate of the first end ladder unit; the second end of the third vertical plate is connected with the first end of the third horizontal plate; the second horizontal plate and the third horizontal plate of the first end ladder unit are respectively vertically connected to the first plane and the second plane of the third vertical plate; the first plane and the second plane of the third vertical plate are parallel; the first tail end step unit is the step unit with the lowest height in the first step structure;
the first end of the fourth vertical plate is connected with the second end of the second horizontal plate of the second end ladder unit; the second end of the fourth vertical plate is connected with the first end of the fourth horizontal plate; the second horizontal plate and the fourth horizontal plate of the second end ladder unit are respectively vertically connected to the first plane and the second plane of the fourth vertical plate; the first plane and the second plane of the fourth vertical plate are parallel; the second end ladder unit is the ladder unit with the lowest height in the second ladder structure; the heights of the fourth vertical plate and the third vertical plate are equal; the length of the fourth vertical plate is less than the height of the second end ladder unit;
the second end of the third horizontal plate is connected with the first end of the first multi-projection structure; the second end of the first multi-projection structure is connected with the first end of the fifth horizontal plate; a second end of the fifth horizontal plate is connected with a first end of the second multi-projection structure; a second end of the second multi-projection structure is connected with a second end of the fourth horizontal plate;
the bulge parts of the first multi-bulge structures are sleeved on the bulge parts of the second multi-bulge structures to form finger-crossing parts.
Optionally, the first multi-projection structure specifically includes:
the fifth vertical plate and the sixth vertical plate are provided with a plurality of multi-bulge parts;
the first end of the fifth vertical plate is connected with the second end of the third horizontal plate; the fifth vertical plate and the third vertical plate are both perpendicular to the third horizontal plate and connected with the lower surface of the third horizontal plate;
the second end of the fifth vertical plate is connected with the first end of the multi-convex part; the second end of the multi-convex part is connected with the first end of the sixth vertical plate; the second end of the sixth vertical plate is connected with the first end of the fifth horizontal plate; the fifth vertical plate and the sixth vertical plate are arranged in the same plane.
Optionally, the multi-protrusion portion specifically includes:
a plurality of single bosses and a plurality of seventh vertical plates;
the structures of the single convex parts are the same; two adjacent single convex parts are connected through two ends of the seventh vertical plate;
the single-lug boss specifically comprises:
an eighth vertical plate, a sixth horizontal plate and a seventh horizontal plate;
the first end of the sixth horizontal plate and the first end of the seventh horizontal plate are respectively connected with two ends of the eighth vertical plate; the sixth horizontal plate and the seventh horizontal plate are vertically connected to the same plane of the eighth vertical plate; the sixth horizontal plate and the seventh horizontal plate are equal in length;
the second end of the sixth horizontal plate of the head end single-lug boss is connected with the second end of the fifth vertical plate; the head end single-convex part is the single-convex part closest to the third horizontal plate in the multi-convex part;
the second end of the seventh horizontal plate of the tail end single-lug boss is connected with the first end of the sixth vertical plate; the tail end single-lug boss is the single-lug boss which is farthest away from the third horizontal plate in the multi-lug boss.
Optionally, the first vertical plate, the second vertical plate, the third vertical plate and the fourth vertical plate have equal thicknesses;
the first horizontal plate and the second horizontal plate are equal in thickness;
the fifth vertical plate, the sixth vertical plate, the seventh vertical plate, the eighth vertical plate, the third horizontal plate, the fourth horizontal plate, the fifth horizontal plate, the sixth horizontal plate and the seventh horizontal plate all have equal thicknesses;
the first vertical plate, the second vertical plate, the third vertical plate, the fourth vertical plate, the fifth vertical plate, the sixth vertical plate, the seventh vertical plate, the eighth vertical plate, the first horizontal plate, the second horizontal plate, the third horizontal plate, the fourth horizontal plate, the fifth horizontal plate, the sixth horizontal plate, and the seventh horizontal plate all have the same width.
A absorber of low frequency electromagnetic waves, comprising:
a plurality of absorption units;
the structures and the sizes of the absorption units are the same; the absorption units are arranged in a periodic and continuous manner;
the absorption unit specifically includes:
a dielectric substrate and an interdigitated stepped resonant structure as claimed in any one of claims 1 to 6;
the interdigital stepped resonance structure is embedded in the dielectric substrate.
Optionally, the bottom of the dielectric substrate is covered with a metal film.
Alternatively to this, the first and second parts may,
the metal film is made of copper;
the medium substrate is made of photosensitive resin;
the interdigital stepped resonance structure is made of conductive silver paste.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
the invention provides an interdigital stepped resonance structure and a wave absorber of low-frequency electromagnetic waves, wherein the interdigital stepped resonance structure comprises: the first stepped structure, the interdigital structure and the second stepped structure are connected in sequence; the first ladder structure and the second ladder structure respectively comprise a plurality of ladder units which are connected in sequence; the heights of the plurality of step units in the first step structure are sequentially reduced along the direction pointing to the interdigital structure; the heights of the plurality of ladder units in the second ladder structure are sequentially reduced along the direction pointing to the interdigital structure. According to the invention, the interdigital stepped resonance structure is arranged, so that the absorption efficiency of low-frequency electromagnetic waves can be improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a schematic diagram of an interdigital stepped resonant structure in accordance with an embodiment of the present invention;
FIG. 2 is a schematic structural view of an absorption unit in an embodiment of the present invention;
FIG. 3 is a top view of a wave absorbing unit in an embodiment of the invention;
FIG. 4 is a front view of a wave absorbing unit in an embodiment of the invention;
FIG. 5 is a schematic diagram illustrating the absorption rate of a wave absorber for horizontally incident electromagnetic waves according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of absorption rate of a wave absorber for electromagnetic waves with an incident angle of 60 ° in an embodiment of the present invention;
FIG. 7 is a schematic diagram of absorption rate of an electromagnetic wave with an incident angle of 80 ° by a wave absorber according to an embodiment of the present invention;
FIG. 8 is a schematic diagram of absorption rate of the absorber for electromagnetic waves with an incident angle of 85 ° in the embodiment of the present invention;
description of the drawings: 1-a dielectric substrate; 2-interdigital stepped resonance structure; 3-metal film.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide an interdigital stepped resonance structure and a wave absorber of low-frequency electromagnetic waves, which can improve the absorption efficiency of the low-frequency electromagnetic waves.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Fig. 1 is a schematic diagram of an interdigital ladder resonance structure in an embodiment of the present invention, and as shown in fig. 1, the present invention provides an interdigital ladder resonance structure, including:
the first stepped structure, the interdigital structure and the second stepped structure are connected in sequence;
the first ladder structure and the second ladder structure respectively comprise a plurality of ladder units which are connected in sequence;
the heights of the plurality of step units in the first step structure are sequentially reduced along the direction pointing to the interdigital structure; the heights of the plurality of ladder units in the second ladder structure are sequentially reduced along the direction pointing to the interdigital structure.
A ladder unit, specifically comprising;
the device comprises a first vertical plate, a first horizontal plate, a second vertical plate and a second horizontal plate;
the first end of the first vertical plate is connected with the first end of the first horizontal plate;
the second end of the first horizontal plate is connected with the first end of the second vertical plate; the first vertical plate and the second vertical plate are both vertical to the first horizontal plate and connected with the lower surface of the first horizontal plate; the first vertical plate is parallel to the second vertical plate; the heights of the first vertical plate and the second vertical plate are equal;
the second end of the second vertical plate is connected with the first end of the second horizontal plate; the second horizontal plate is parallel to the first horizontal plate;
the second end of the first vertical plate is connected with the second end of a second horizontal plate in a first adjacent step unit of the step unit; the first adjacent step unit is an adjacent step unit far away from the interdigital structure;
the second end of the second horizontal plate is connected with the second end of the first vertical plate in the second adjacent step unit of the step unit; the second adjacent step unit is an adjacent step unit close to the interdigital structure.
The interdigital structure specifically includes:
a third vertical plate, a fourth vertical plate, a third horizontal plate, a fourth horizontal plate, a fifth horizontal plate, a first multi-projection structure and a second multi-projection structure;
the first end of the third vertical plate is connected with the second end of the second horizontal plate of the first end ladder unit; the second end of the third vertical plate is connected with the first end of the third horizontal plate; the second horizontal plate and the third horizontal plate of the first end ladder unit are respectively and vertically connected to the first plane and the second plane of the third vertical plate; the first plane and the second plane of the third vertical plate are parallel; the first tail end step unit is the step unit with the lowest height in the first step structure;
the first end of the fourth vertical plate is connected with the second end of the second horizontal plate of the second end ladder unit; the second end of the fourth vertical plate is connected with the first end of the fourth horizontal plate; the second horizontal plate and the fourth horizontal plate of the second end ladder unit are respectively and vertically connected to the first plane and the second plane of the fourth vertical plate; the first plane and the second plane of the fourth vertical plate are parallel; the second end ladder unit is the ladder unit with the lowest height in the second ladder structure; the heights of the fourth vertical plate and the third vertical plate are equal; the length of the fourth vertical plate is less than the height of the second end ladder unit;
the second end of the third horizontal plate is connected with the first end of the first multi-bulge structure; the second end of the first multi-bulge structure is connected with the first end of the fifth horizontal plate; the second end of the fifth horizontal plate is connected with the first end of the second multi-bulge structure; the second end of the second multi-bulge structure is connected with the second end of the fourth horizontal plate;
the bulge parts of the first multi-bulge structures are sleeved on the bulge parts of the second multi-bulge structures to form finger crossing parts.
First many protruding structures specifically includes:
the fifth vertical plate and the sixth vertical plate are provided with a plurality of multi-bulge parts;
the first end of the fifth vertical plate is connected with the second end of the third horizontal plate; the fifth vertical plate and the third vertical plate are both vertical to the third horizontal plate and connected with the lower surface of the third horizontal plate;
the second end of the fifth vertical plate is connected with the first end of the multi-bulge part; the second end of the multi-bulge part is connected with the first end of the sixth vertical plate; the second end of the sixth vertical plate is connected with the first end of the fifth horizontal plate; the fifth vertical plate and the sixth vertical plate are arranged in the same plane.
The many bulges specifically include:
a plurality of single bosses and a plurality of seventh vertical plates;
the structures of the single convex parts are the same; two adjacent single-bulge parts are connected through two ends of the seventh vertical plate;
the single-lobe specifically includes:
an eighth vertical plate, a sixth horizontal plate and a seventh horizontal plate;
the first end of the sixth horizontal plate and the first end of the seventh horizontal plate are respectively connected with the two ends of the eighth vertical plate; the sixth horizontal plate and the seventh horizontal plate are vertically connected to the same plane of the eighth vertical plate; the sixth horizontal plate and the seventh horizontal plate are equal in length;
the second end of the sixth horizontal plate of the head end single-lug boss is connected with the second end of the fifth vertical plate; the head end single-convex part is the single-convex part closest to the third horizontal plate in the multi-convex part;
the second end of the seventh horizontal plate of the tail end single-lug boss is connected with the first end of the sixth vertical plate; the tail end single-lug boss is the single-lug boss which is farthest away from the third horizontal plate in the multi-lug boss.
Specifically, the second multi-projection structure has a structure similar to that of the first multi-projection structure; the difference is that the length of the eighth vertical plate in the first multi-projection structure is greater than the length of the eighth vertical plate in the second multi-projection structure; the length of the fifth vertical plate in the first multi-convex structure is less than that of the fifth vertical plate in the second multi-convex structure; the length of the sixth vertical plate in the first multi-projection structure is less than the length of the sixth vertical plate in the second multi-projection structure. The other parts of the second multi-projection structure are the same as those of the first multi-projection structure, and are not described herein.
Specifically, the thicknesses of the first vertical plate, the second vertical plate, the third vertical plate and the fourth vertical plate are all equal;
the first horizontal plate and the second horizontal plate have equal thickness;
the thicknesses of the fifth vertical plate, the sixth vertical plate, the seventh vertical plate, the eighth vertical plate, the third horizontal plate, the fourth horizontal plate, the fifth horizontal plate, the sixth horizontal plate and the seventh horizontal plate are equal;
the widths of the first vertical plate, the second vertical plate, the third vertical plate, the fourth vertical plate, the fifth vertical plate, the sixth vertical plate, the seventh vertical plate, the eighth vertical plate, the first horizontal plate, the second horizontal plate, the third horizontal plate, the fourth horizontal plate, the fifth horizontal plate, the sixth horizontal plate and the seventh horizontal plate are all equal.
FIG. 2 is a schematic structural view of an absorption unit in an embodiment of the present invention; FIG. 3 is a top view of a wave absorbing unit in an embodiment of the invention; FIG. 4 is a front view of a wave absorbing unit in an embodiment of the invention; as shown in fig. 2 to 4, the present invention provides a wave absorber of low frequency electromagnetic waves, comprising:
a plurality of absorption units;
the structures and the sizes of the absorption units are the same; the absorption units are arranged in a periodic and continuous manner;
the absorption unit specifically includes:
a dielectric substrate 1 and an interdigital stepped resonance structure 2;
the interdigital stepped resonance structure 2 is embedded in the dielectric substrate 1.
Specifically, the bottom of the dielectric substrate is covered with a metal film. The material of the metal film is copper.
The dielectric substrate is made of photosensitive resin, the dielectric constant of the dielectric substrate is 2.9, and the loss tangent value is 0.02;
the interdigital stepped resonance structure is made of conductive silver paste; conductivity of 5.88X 105s/m。
The bottom surface of the dielectric substrate is square, the thickness h is 3.9mm, and the side length p of the square is 7 mm; the distance h1 between the cross-finger-shaped stepped resonance structure and the bottom surface of the dielectric substrate is 0.6 mm; the distance h3 between the cross-finger-shaped stepped resonance structure and the top surface of the dielectric substrate is 0.6 mm; the length h2 of the fifth vertical plate and the sixth vertical plate is 2 mm; specifically, the height of the step unit with the farthest interdigital structure is h 4-3.2 mm; the width d of the interdigital structure is 2.5 mm; the thickness d1 of the first horizontal plate and the second horizontal plate is 0.036 mm; the thickness d2 of the first vertical plate, the second vertical plate, the third vertical plate and the fourth vertical plate is 0.072 mm; the thickness d3 of the fifth vertical plate, the sixth vertical plate, the seventh vertical plate, the eighth vertical plate, the third horizontal plate, the fourth horizontal plate, the fifth horizontal plate, the sixth horizontal plate and the seventh horizontal plate is 0.05 mm; the length d4 of the third horizontal plate is 1.4 mm; the length d5 of the fourth horizontal plate is 1.05 mm; half of the length d6 of the interdigital structure is 1.25 mm; the distance d7 from the interdigital ladder resonant structure to the side surface (the side surface is perpendicular to the interdigital ladder resonant structure and is closest to the interdigital ladder resonant structure) in the dielectric substrate is 0.074 mm; the distance d8 between the third vertical plate and the eighth vertical plate is 0.278 mm; the length d9 of the first horizontal plate and the second horizontal plate is 0.344 mm; the distance a between the first vertical plate and the second vertical plate is 0.2 mm; the width b of the first vertical plate, the second vertical plate, the third vertical plate, the fourth vertical plate, the fifth vertical plate, the sixth vertical plate, the seventh vertical plate, the eighth vertical plate, the first horizontal plate, the second horizontal plate, the third horizontal plate, the fourth horizontal plate, the fifth horizontal plate, the sixth horizontal plate and the seventh horizontal plate; the height difference c between adjacent step units is 0.3 mm; the distance from the eighth vertical plate to the midpoint of the interdigital stepped resonance structure is e; the distance from the third horizontal plate to the sixth horizontal plate of the head end single-lug boss in the first multi-lug structure is t 1; the thickness of the metal film is t 2.
Wherein: d4+ d5+ d3
d6＝d/2
d4＝d/2+3*d3
d5＝d/2-4*d3
d9＝a+2*d2
h4＝h2+4*c
FIG. 5 is a schematic diagram illustrating the absorption rate of a wave absorber for horizontally incident electromagnetic waves according to an embodiment of the present invention; as shown in fig. 5, the interdigital stepped resonance structure and the absorber of low frequency electromagnetic waves provided by the present invention have an absorption peak in a low frequency band of 0 to 5GHZ, and the absorption efficiency is above 90%.
FIG. 6 is a schematic diagram of absorption rate of a wave absorber for electromagnetic waves with an incident angle of 60 ° in an embodiment of the present invention; FIG. 7 is a schematic diagram of absorption rate of an electromagnetic wave with an incident angle of 80 ° by a wave absorber according to an embodiment of the present invention; fig. 8 is a schematic diagram of absorption rate of an electromagnetic wave at an incident angle of 85 ° by a wave absorber according to an embodiment of the present invention, where the abscissa in fig. 5-8 is electromagnetic wave frequency and the ordinate is electromagnetic wave absorption rate; as shown in fig. 6 to 8, the present invention has a good absorption effect on electromagnetic waves incident at large incident angles such as 60 °, 80 ° and 85 °, and the absorption rate can still reach 90% or more even when the incident angle is 85 °.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. For the system disclosed by the embodiment, the description is relatively simple because the system corresponds to the method disclosed by the embodiment, and the relevant points can be referred to the method part for description.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In summary, this summary should not be construed to limit the present invention.
Claims (9)
1. An interdigitated stepped resonant structure, comprising:
the first stepped structure, the interdigital structure and the second stepped structure are connected in sequence;
the first step structure and the second step structure respectively comprise a plurality of step units which are connected in sequence;
the heights of the plurality of step units in the first step structure are sequentially reduced along the direction pointing to the interdigital structure; the heights of the plurality of ladder units in the second ladder structure are sequentially reduced along the direction pointing to the interdigital structure.
2. The absorber of low frequency electromagnetic waves according to claim 1, wherein the ladder unit, in particular, comprises;
the device comprises a first vertical plate, a first horizontal plate, a second vertical plate and a second horizontal plate;
the first end of the first vertical plate is connected with the first end of the first horizontal plate;
the second end of the first horizontal plate is connected with the first end of the second vertical plate; the first vertical plate and the second vertical plate are both perpendicular to the first horizontal plate and connected with the lower surface of the first horizontal plate; the first vertical plate is parallel to the second vertical plate; the first vertical plate and the second vertical plate are equal in height;
the second end of the second vertical plate is connected with the first end of the second horizontal plate; the second horizontal plate is parallel to the first horizontal plate;
the second end of the first vertical plate is connected with the second end of a second horizontal plate in a first adjacent step unit of the step unit; the first adjacent step unit is an adjacent step unit far away from the interdigital structure;
the second end of the second horizontal plate is connected with the second end of the first vertical plate in the second adjacent step unit of the step unit; the second adjacent step unit is an adjacent step unit close to the interdigital structure.
3. The absorber of low frequency electromagnetic waves according to claim 2, wherein the interdigital structure specifically comprises:
a third vertical plate, a fourth vertical plate, a third horizontal plate, a fourth horizontal plate, a fifth horizontal plate, a first multi-projection structure and a second multi-projection structure;
the first end of the third vertical plate is connected with the second end of the second horizontal plate of the first end ladder unit; the second end of the third vertical plate is connected with the first end of the third horizontal plate; the second horizontal plate and the third horizontal plate of the first end ladder unit are respectively vertically connected to the first plane and the second plane of the third vertical plate; the first plane and the second plane of the third vertical plate are parallel; the first tail end step unit is the step unit with the lowest height in the first step structure;
the first end of the fourth vertical plate is connected with the second end of the second horizontal plate of the second end ladder unit; the second end of the fourth vertical plate is connected with the first end of the fourth horizontal plate; the second horizontal plate and the fourth horizontal plate of the second end ladder unit are respectively vertically connected to the first plane and the second plane of the fourth vertical plate; the first plane and the second plane of the fourth vertical plate are parallel; the second end ladder unit is the ladder unit with the lowest height in the second ladder structure; the heights of the fourth vertical plate and the third vertical plate are equal; the length of the fourth vertical plate is less than the height of the second end ladder unit;
the second end of the third horizontal plate is connected with the first end of the first multi-projection structure; the second end of the first multi-projection structure is connected with the first end of the fifth horizontal plate; a second end of the fifth horizontal plate is connected with a first end of the second multi-projection structure; a second end of the second multi-projection structure is connected with a second end of the fourth horizontal plate;
the bulge parts of the first multi-bulge structures are sleeved on the bulge parts of the second multi-bulge structures to form finger-crossing parts.
4. The absorber of low frequency electromagnetic waves according to claim 3, wherein the first multi-bump structure specifically comprises:
the fifth vertical plate and the sixth vertical plate are provided with a plurality of multi-bulge parts;
the first end of the fifth vertical plate is connected with the second end of the third horizontal plate; the fifth vertical plate and the third vertical plate are both perpendicular to the third horizontal plate and connected with the lower surface of the third horizontal plate;
the second end of the fifth vertical plate is connected with the first end of the multi-convex part; the second end of the multi-convex part is connected with the first end of the sixth vertical plate; the second end of the sixth vertical plate is connected with the first end of the fifth horizontal plate; the fifth vertical plate and the sixth vertical plate are arranged in the same plane.
5. The absorber of low frequency electromagnetic waves according to claim 4, wherein the multi-bump portion specifically comprises:
a plurality of single bosses and a plurality of seventh vertical plates;
the structures of the single convex parts are the same; two adjacent single convex parts are connected through two ends of the seventh vertical plate;
the single-lug boss specifically comprises:
an eighth vertical plate, a sixth horizontal plate and a seventh horizontal plate;
the first end of the sixth horizontal plate and the first end of the seventh horizontal plate are respectively connected with two ends of the eighth vertical plate; the sixth horizontal plate and the seventh horizontal plate are vertically connected to the same plane of the eighth vertical plate; the sixth horizontal plate and the seventh horizontal plate are equal in length;
the second end of the sixth horizontal plate of the head end single-lug boss is connected with the second end of the fifth vertical plate; the head end single-convex part is the single-convex part closest to the third horizontal plate in the multi-convex part;
the second end of the seventh horizontal plate of the tail end single-lug boss is connected with the first end of the sixth vertical plate; the tail end single-lug boss is the single-lug boss which is farthest away from the third horizontal plate in the multi-lug boss.
6. The absorber for low frequency electromagnetic waves according to claim 5,
the thicknesses of the first vertical plate, the second vertical plate, the third vertical plate and the fourth vertical plate are all equal;
the first horizontal plate and the second horizontal plate are equal in thickness;
the fifth vertical plate, the sixth vertical plate, the seventh vertical plate, the eighth vertical plate, the third horizontal plate, the fourth horizontal plate, the fifth horizontal plate, the sixth horizontal plate and the seventh horizontal plate all have equal thicknesses;
the first vertical plate, the second vertical plate, the third vertical plate, the fourth vertical plate, the fifth vertical plate, the sixth vertical plate, the seventh vertical plate, the eighth vertical plate, the first horizontal plate, the second horizontal plate, the third horizontal plate, the fourth horizontal plate, the fifth horizontal plate, the sixth horizontal plate, and the seventh horizontal plate all have the same width.
7. A wave absorber of low frequency electromagnetic waves, the wave absorber comprising:
a plurality of absorption units;
the structures and the sizes of the absorption units are the same; the absorption units are arranged in a periodic and continuous manner;
the absorption unit specifically includes:
a dielectric substrate and an interdigitated stepped resonant structure as claimed in any one of claims 1 to 6;
the interdigital stepped resonance structure is embedded in the dielectric substrate.
8. The absorber of low frequency electromagnetic waves of claim 7, wherein the bottom of the dielectric substrate is covered with a metal film.
9. The absorber for low frequency electromagnetic waves according to claim 7,
the metal film is made of copper;
the medium substrate is made of photosensitive resin;
the interdigital stepped resonance structure is made of conductive silver paste.
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