Electromagnetic periodic array structure

Abstract

The invention relates to the technical field of microwaves, and provides an electromagnetic periodic array structure, which comprises a plurality of first dielectric plates and a plurality of second dielectric plates, the plurality of first dielectric plates are arranged at intervals along a first direction, the plurality of second dielectric plates are arranged at intervals along a second direction, and the first direction intersects with the second direction; each first dielectric plate is pivotally connected with the plurality of second dielectric plates around a third direction to form a plurality of array units with parallelogram-shaped openings and variable included angles, and the third direction is perpendicular to the first direction and the second direction. According to the electromagnetic periodic array structure, the reconfigurable frequency selective surface is realized by utilizing the mechanical structure of the electromagnetic periodic array structure, the adjustment is relatively convenient, the cost is low, the reliability is high, and the problems that an external control circuit is complicated and the cost is increased possibly due to the fact that a large number of active devices are used on an active frequency selective surface are solved.

Description

Technical Field

[0001] The present application relates to the field of microwave technology, and in particular to an electromagnetic periodic array structure. Background Art

[0002] The same array units are arranged periodically in one, two or three dimensions to form a periodic array structure. The frequency selective surface is the most typical electromagnetic periodic array structure, which has different reflection or transmission characteristics for electromagnetic waves of different frequencies. Traditional frequency selective surfaces only have a specific frequency response characteristic and cannot adapt to complex and changeable electromagnetic environments. Therefore, reconfigurable frequency selective surfaces have received widespread attention because of their greater practical application value.

[0003] Research on reconfigurable frequency selective surfaces mainly focuses on active frequency selective surfaces loaded with active devices, such as reconfigurable frequency selective surfaces based on PIN diodes and capacitor diodes. However, the extensive use of active devices may lead to many challenges for active frequency selective surfaces, such as complex external control circuits and rising costs. Summary of the invention

[0004] In view of this, an embodiment of the present application provides an electromagnetic periodic array structure to solve the problem of complex external control circuits and increased costs that may be caused by the extensive use of active devices in active frequency selective surfaces.

[0005] An embodiment of the present application proposes an electromagnetic periodic array structure, comprising a plurality of first dielectric plates and a plurality of second dielectric plates, wherein the plurality of first dielectric plates are arranged at intervals along a first direction, and the plurality of second dielectric plates are arranged at intervals along a second direction, and the first direction intersects with the second direction; each of the first dielectric plates is pivotally connected to the plurality of second dielectric plates around a third direction to form a plurality of array units with openings in the form of parallelograms and variable angles, and the third direction is perpendicular to the first direction and the second direction.

[0006] The electromagnetic periodic array structure provided in the embodiment of the present application includes a plurality of first dielectric plates and a plurality of second dielectric plates. Since a plurality of first dielectric plates arranged at intervals along a first direction are pivotally connected with a plurality of second dielectric plates arranged at intervals along a second direction around a third direction, a plurality of array units in the form of parallelograms with variable angles are formed. The electromagnetic periodic array structure uses its own mechanical structure to realize a reconfigurable frequency selective surface, which is not only convenient to adjust, but also low in cost and high in reliability, and solves the problem of complex external control circuits and increased costs that may be caused by the large-scale use of active devices in active frequency selective surfaces.

[0007] In some embodiments, the first dielectric plate has a plurality of first sockets arranged at intervals, the second dielectric plate has a plurality of second sockets arranged at intervals, and the first sockets are plugged into the second sockets in the third direction to achieve a pivotal connection between the first dielectric plate and the second dielectric plate.

[0008] By adopting the above technical solution, the first dielectric plate and the second dielectric plate are pivotally connected by plugging the first socket and the second socket in the third direction, and the structure is relatively simple.

[0009] In some embodiments, one of the first socket and the second socket is provided with a socket, the other of the first socket and the second socket is provided with an insertion rod, and the socket and the insertion rod are plugged into each other in the third direction.

[0010] By adopting the above technical solution, the insertion hole and the insertion rod are inserted in the third direction to locate the pivotal connection position of the first dielectric plate and the second dielectric plate, and the stability is better.

[0011] In some embodiments, the spacing distance between any two adjacent first dielectric plates is equal, and the spacing distance between any two adjacent second dielectric plates is equal.

[0012] By adopting the above technical solution, the density of the first dielectric plate and the second dielectric plate are the same.

[0013] In some embodiments, a spacing distance between two adjacent first dielectric plates is equal to a spacing distance between two adjacent second dielectric plates.

[0014] By adopting the above technical solution, the density of the entire electromagnetic periodic array structure is made the same.

[0015] In some embodiments, the first dielectric plate and the second dielectric plate have the same structure.

[0016] By adopting the above technical solution, there is no need to distinguish between the first dielectric plate and the second dielectric plate during assembly, which facilitates the first dielectric plate and the second dielectric plate to be assembled together.

[0017] In some embodiments, the angle can be varied in a range of 20° to 160°.

[0018] In some embodiments, a metal layer is provided on the inner wall and / or outer wall of the array unit.

[0019] In some embodiments, the metal layer is disposed on the four inner walls or the four outer walls of the array unit.

[0020] In some embodiments, the metal layer includes two independently arranged and rotationally symmetrical L-shaped metal layers.

[0021] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or conventional technical descriptions will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0023] Figure 1 is a three-dimensional schematic diagram of an electromagnetic periodic array structure provided in an embodiment of the present application;

[0024] Figure 2 yes Figure 1 A three-dimensional schematic diagram of the electromagnetic periodic array structure after the first dielectric plate and the second dielectric plate are inserted together;

[0025] Figure 3 yes Figure 2 A three-dimensional schematic diagram of the first dielectric plate and the second dielectric plate before being plugged together;

[0026] Figure 4 yes Figure 1 A three-dimensional schematic diagram of an array unit in the electromagnetic periodic array structure shown;

[0027] Figure 5 yes Figure 4 The plane diagram of the array unit after expansion;

[0028] Figure 6 is a schematic diagram of the relationship between the electric field direction of the incident wave and the magnetic field direction of the incident wave and the angle in this embodiment when a plane electromagnetic wave is incident vertically;

[0029] Figure 7 is Figure 6 When the incident wave is at an angle of 90 degrees, the |S of the array unit under periodic boundary conditions 21 |Simulation results;

[0030] Figure 8 is Figure 7 The resonant frequency f in the simulation results L Schematic diagram of current distribution in the metal layer when ;

[0031] Fig. 9 is Figure 7 The resonant frequency f in the simulation results H Schematic diagram of current distribution in the metal layer when ;

[0032] Fig.10 is the graph of the expression f(β) as β changes;

[0033] Fig.11 It is the graph of the expression h(β) as β changes;

[0034] Fig.12 is Figure 6 |S of the array unit under periodic boundary conditions in the case of incident wave 21 |Simulation results with varying β.

[0035] The meanings of the marks in the figure are:

[0036] 100, electromagnetic periodic array structure; 110, first interval; 120, first dielectric plate; 121, first socket; 1211, plug rod; 130, second interval; 140, second dielectric plate; 141, second socket; 1411, jack; 150, array unit; 151, metal layer; 1511, fracture; 152, opening; 92, first direction; 94, second direction; 96, third direction. DETAILED DESCRIPTION

[0037] The following embodiments of the technical solution of the present application will be described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0038] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0039] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0040] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0041] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0042] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0043] In the description of the embodiments of the present application, the orientations or positional relationships indicated by technical terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the embodiments of the present application.

[0044] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0045] The same array units are arranged periodically in one, two or three dimensions to form a periodic array structure. The frequency selective surface is the most typical electromagnetic periodic array structure, which has different reflection or transmission characteristics for electromagnetic waves of different frequencies. Traditional frequency selective surfaces only have a specific frequency response characteristic and cannot adapt to complex and changeable electromagnetic environments. Therefore, reconfigurable frequency selective surfaces have received widespread attention because of their greater practical application value.

[0046] Research on reconfigurable frequency selective surfaces mainly focuses on active frequency selective surfaces loaded with active devices, such as reconfigurable frequency selective surfaces based on PIN diodes and capacitor diodes. However, the extensive use of active devices may lead to many challenges for active frequency selective surfaces, such as complex external control circuits and rising costs.

[0047] In order to solve the problem of complex external control circuits and increased costs that may be caused by the extensive use of active devices in active frequency selective surfaces, the inventors designed an electromagnetic periodic array structure after in-depth research.

[0048] This electromagnetic periodic array structure uses its own mechanical structure to realize a reconfigurable frequency selective surface, which is not only convenient to adjust but also low in cost and high in reliability. It solves the problem of complex external control circuits and increased costs that may be caused by the large-scale use of active devices in active frequency selective surfaces.

[0049] The embodiment of the present application proposes an electromagnetic periodic array structure. Figure 1 The electromagnetic periodic array structure 100 includes a plurality of first dielectric plates 120 and a plurality of second dielectric plates 140, wherein the plurality of first dielectric plates 120 are arranged at intervals along a first direction 92, and the plurality of second dielectric plates 140 are arranged at intervals along a second direction 94, and the first direction 92 intersects with the second direction 94; each first dielectric plate 120 is pivotally connected to the plurality of second dielectric plates 140 about a third direction 96 to form a plurality of array units 150 whose openings are parallelograms and whose angles are variable.

[0050] It can be understood that among the plurality of first dielectric plates 120 arranged at intervals along the first direction 92 , the intervals between two adjacent first dielectric plates 120 may be equal, unequal, or partially equal.

[0051] It can be understood that among the plurality of second dielectric plates 140 arranged at intervals along the second direction 94 , the intervals between two adjacent second dielectric plates 140 may be equal, unequal, or partially equal.

[0052] Among them, the first direction 92 is the extension direction of the second dielectric plate 140, and the second direction 94 is the extension direction of the first dielectric plate 120; the angle formed by the intersection of the first direction 92 and the second direction 94 is the same as the angle of the array unit 150, and the angle between the first direction 92 and the second direction 94 changes as the first dielectric plate 120 and the second dielectric plate 140 pivot relative to each other.

[0053] When the spacing between two adjacent first dielectric plates 120 and the spacing between two adjacent second dielectric plates 140 are equal, it can be understood that the spacing between two adjacent second dielectric plates 140 may be equal to or unequal to the spacing between two adjacent second dielectric plates 140 .

[0054] It can be understood that the structures of the first dielectric plate 120 and the second dielectric plate 140 can be the same or different. The number of the first dielectric plate 120 and the second dielectric plate 140 can be the same or different.

[0055] The first dielectric plate 120 and the second dielectric plate 140 are pivotally connected about the third direction 96 , which means that the first dielectric plate 120 and the second dielectric plate 140 can rotate relative to each other about the third direction 96 , so as to achieve a variable angle of the array unit 150 .

[0056] Both ends of the array unit 150 have openings 152, and the shape of the opening 152 is a parallelogram. The opening 152, parts of the two first dielectric plates 120, and parts of the two second dielectric plates 140 together constitute the array unit 150. The angle of the array unit 150 is the angle formed by the pivoting of one of the first dielectric plates 120 in the array unit 150 and one of the second dielectric plates 140 in the array unit 150.

[0057] The electromagnetic periodic array structure 100 provided in the embodiment of the present application includes a plurality of first dielectric plates 120 and a plurality of second dielectric plates 140. Since a plurality of first dielectric plates 120 arranged at intervals along a first direction 92 and a plurality of second dielectric plates 140 arranged at intervals along a second direction 94 are pivotally connected around a third direction 96, a plurality of array units 150 with a parallelogram shape and a variable angle are formed; as the angle increases, the low-frequency magnetic resonance and the high-frequency electric resonance move in opposite directions, realizing a periodic array structure with a band-stop characteristic with a stable center frequency and continuously adjustable bandwidth. The electromagnetic periodic array structure 100 uses its own mechanical structure to realize a reconfigurable frequency selective surface, which is not only convenient to adjust, but also low in cost and high in reliability, and solves the problem of complex external control circuits and increased costs that may be caused by the large-scale use of active devices on active frequency selective surfaces.

[0058] Please also refer to Figure 1 and Figure 2 In some embodiments, the first dielectric plate 120 has a plurality of first sockets 121 arranged at intervals, and the second dielectric plate 140 has a plurality of second sockets 141 arranged at intervals. The first sockets 121 and the second sockets 141 are plugged into each other in the third direction 96 to achieve a pivotal connection between the first dielectric plate 120 and the second dielectric plate 140.

[0059] The plurality of first sockets 121 are arranged at intervals along the second direction 94 , and the plurality of second sockets 141 are arranged at intervals along the first direction 92 .

[0060] The number of the first sockets 121 is the same as the number of the second dielectric plates 140 , and the number of the second sockets 141 is the same as the number of the first dielectric plates 120 .

[0061] The size of the first socket 121 in the second direction 94 is slightly larger than the thickness of the second dielectric plate 140, and the size of the second socket 141 in the first direction 92 is slightly larger than the thickness of the first dielectric plate 120. When the first socket 121 and the second socket 141 are plugged into each other in the third direction 96, the first dielectric plate 120 and the second dielectric plate 140 can rotate relative to each other around the third direction 96, thereby achieving a change in the angle.

[0062] By adopting the above technical solution, the first socket 121 and the second socket 141 are plugged together in the third direction 96 to achieve the pivotal connection between the first dielectric plate 120 and the second dielectric plate 140 , and the structure is relatively simple.

[0063] like Figure 3 As shown, in some embodiments, one of the first socket 121 and the second socket 141 is provided with a socket 1411, and the other of the first socket 121 and the second socket 141 is provided with an insertion rod 1211, and the socket 1411 and the insertion rod 1211 are plugged together in the third direction 96.

[0064] It can be understood that the first socket 121 is provided with an insert rod 1211 , and the second socket 141 is provided with a socket 1411 ; or the first socket 121 is provided with a socket 1411 , and the second socket 141 is provided with an insert rod 1211 .

[0065] The insertion rod 1211 is a cylindrical rod, the insertion hole 1411 is a cylindrical hole, and the axes of the insertion rod 1211 and the insertion hole 1411 both extend along the third direction 96 .

[0066] By adopting the above technical solution, the insertion hole 1411 and the insertion rod 1211 are inserted in the third direction 96 to locate the pivotal connection position of the first dielectric plate 120 and the second dielectric plate 140, and the stability is better.

[0067] It is understandable that in other embodiments, the jack 1411 and the plug rod 1211 may not be provided, and the first dielectric plate 120 and the second dielectric plate 140 are pivotally connected only by plugging the first socket 121 and the second socket 141 together in the third direction 96 .

[0068] In some embodiments, the spacing distance between any two adjacent first dielectric plates 120 is equal, and the spacing distance between any two adjacent second dielectric plates 140 is equal.

[0069] like Figure 1 As shown, all the first dielectric plates 120 are arranged in parallel and spaced apart along the first direction 92 , and the interval between any two adjacent first dielectric plates 120 is the first interval 110 ; all the second dielectric plates 140 are arranged in parallel and spaced apart along the second direction 94 , and the interval between any two adjacent second dielectric plates 140 is the second interval 130 .

[0070] By adopting the above technical solution, the first dielectric plate 120 and the second dielectric plate 140 have the same density.

[0071] It can be understood that in the embodiment, some of the first intervals 110 are the same, or all of the first intervals 110 are different.

[0072] It can be understood that in the embodiment, some of the second intervals 130 are the same, or all of the second intervals 130 are different.

[0073] In some embodiments, a spacing distance between two adjacent first dielectric plates 120 is equal to a spacing distance between two adjacent second dielectric plates 140 .

[0074] Since the interval between any two adjacent first dielectric plates 120 is the first interval 110 and the interval between any two adjacent second dielectric plates 140 is the second interval 130, the first interval 110 is equal to the second interval 130, so that the density of the entire electromagnetic periodic array structure 100 is the same.

[0075] It can be understood that in other embodiments, the spacing distance between two adjacent first dielectric plates 120 may be greater than or less than the spacing distance between two adjacent second dielectric plates 140 .

[0076] In some embodiments, the first dielectric plate 120 and the second dielectric plate 140 have the same structure.

[0077] The first dielectric plate 120 and the second dielectric plate 140 are made of the same material, size and shape. Figure 1 and Figure 4 As shown, the dimensions of the array unit 150 in the first direction 92 , the second direction 94 , and the third direction 96 are all s.

[0078] By adopting the above technical solution, there is no need to distinguish between the first dielectric plate 120 and the second dielectric plate 140 during assembly, which facilitates the first dielectric plate 120 and the second dielectric plate 140 to be assembled together.

[0079] It is understandable that in other embodiments, the structures of the first dielectric plate 120 and the second dielectric plate 140 may be different, for example, the first dielectric plate 120 may be longer or shorter than the second dielectric plate 140 .

[0080] In some embodiments, the variable range of the included angle is 20°-160°.

[0081] like Figure 4 As shown, the included angle between the first direction 92 and the second direction 94 is variable, ranging from 20° to 160°, and accordingly, the included angle of the array unit 150 also changes accordingly.

[0082] By adopting the above technical solution, the reconfigurable range of the frequency selective surface is made larger.

[0083] It can be understood that in other embodiments, the angle between the first direction 92 and the second direction 94 may range from 0-20° or from 160° to 180°.

[0084] In some embodiments, a metal layer 151 is disposed on the inner wall and / or outer wall of the array unit 150 .

[0085] The inner wall refers to a side wall facing the opening 152 in an array unit 150 , and the outer wall refers to a side wall facing away from the opening 152 in an array unit 150 .

[0086] It can be understood that the metal layer 151 is provided on the inner wall of the array unit 150 , or the metal layer 151 is provided on the outer wall of the array unit 150 , or the metal layer 151 is provided on both the inner wall and the outer wall of the array unit 150 .

[0087] By adopting the above technical solution, the metal layer 151 can better regulate electromagnetic waves.

[0088] Please refer to Figure 1 and Figure 2 In some embodiments, a metal layer 151 is disposed on each of the four outer walls of the array unit 150 .

[0089] The array units 150 are arranged at intervals in both the first direction 92 and the second direction 94 .

[0090] It can be understood that in other embodiments, the metal layer 151 can be provided on all four inner walls of the array unit 150 .

[0091] like Figure 4 and Figure 5 As shown, in some embodiments, the metal layer 151 includes two independently arranged and rotationally symmetrical L-shaped metal layers.

[0092] The opposite ends of the two L-shaped metal layers form a fracture 1511 .

[0093] Please refer to Figure 2 and Figure 5The structural parameters of the electromagnetic periodic array structure proposed in this application and the dielectric parameters of the dielectric plate in the embodiment are as follows:

[0094] Table 1: Structural parameters of the electromagnetic periodic array structure and dielectric parameters of the dielectric plate

[0095]

[0096] Among them, t represents the thickness of the dielectric plate, s represents the width of the dielectric plate in the third direction 96, w represents the width of the L-shaped metal layer, L1 represents the distance between the two short sides of the L-shaped metal layer, L2 represents the length of the long side of the L-shaped metal layer, W1 represents the distance between the two long sides of the L-shaped metal layer, and W2 represents the length of the short side of the L-shaped metal layer.

[0097] When the plane electromagnetic wave Figure 6 When the electric field direction is perpendicular to the magnetic field direction, the electromagnetic periodic array structure 100 will interact with the incident plane electromagnetic wave and exhibit Figure 7 The two resonant frequencies (f L and f H ) has a band-stop filtering characteristic. The electric field direction and the magnetic field direction are two diagonal directions of the electromagnetic periodic array structure 100, respectively.

[0098] When the resonant frequency is f L When the metal layer 151 on the four walls of the array unit 150 has Figure 8 The circular currents with approximately equal amplitude and phase as shown can be equivalent to four magnetic dipoles with dipole moments m1, m2, m3 and m4 perpendicular to the plane where the metal layer 151 is located. When the resonant frequency is f H When the metal layer 151 on the four walls of the array unit 150 has Fig. 9 The current shown as a whole is directed in the same direction, and thus can be equivalent to four electric dipoles with dipole moments p1, p2, p3 and p4 respectively parallel to the plane where the metal layer 151 is located.

[0099] Since the physical size of the array unit 150 is significantly smaller than the wavelength, the limited distance between the array units 150 will result in strong interactions between the array units 150. Strong interactions will cause the overall characteristics of the periodic array structure to be significantly different from the characteristics of the array units 150.

[0100] According to the principle of dipole-dipole interaction, the distance between the two centers is r ji The dipole moments are p i and p j The quasi-static interaction energy V between the electric dipoles can be given by expression (1):

[0101]

[0102] The higher the energy level of the quasi-static interaction energy, the more unstable the system and the higher the resonant frequency; correspondingly, the lower the energy level of the quasi-static interaction energy, the more stable the system and the lower the resonant frequency. The interaction energy relationship of magnetic dipoles only requires replacing 1 / ε0 in expression (1) with μ0. At the same time, it can be seen from expression (1) that the direction and distance of the magnetic dipole play a key role in the level of quasi-static interaction energy. Among them, ε0 is the vacuum dielectric constant and μ0 is the vacuum magnetic permeability.

[0103] When the resonant frequency is f L When , according to the distance and angle relationship between the magnetic dipoles and expression (1), Figure 8 The quasi-static interaction energy of the four magnetic dipoles shown can be expressed as:

[0104]

[0105] Wherein, m is the magnitude of the magnetic dipole moment, s is the width of the dielectric plate, and 2β is the angle of the array unit 150 . Fig.10 The expression f(β) is plotted as β changes. When , the quasi-static interaction energy of the four magnetic dipoles decreases with the increase of β.

[0106] When the resonant frequency is f H When , since the current along the z-axis is close to the current along the z-axis of the adjacent surface, the change of β does not affect the direction of the current in the z-axis direction and has a limited effect on the spacing of the current in the z-axis direction, so the resonant frequency is considered to be f H The influence of the quasi-static interaction energy of electric dipoles on the xoy plane on the change of β is mainly contributed by the change of the mutual orientation and distance between the electric dipoles equivalent to the current on the xoy plane with β. According to the distance and angle relationship between the electric dipoles and expression (1), Fig. 9 The quasi-static interaction energy of the four electric dipoles shown can be expressed as:

[0107]

[0108] Wherein, p is the magnitude of the electric dipole moment, s is the width of the dielectric plate, and 2β is the angle of the array unit 150 . Fig.11 The expression h(β) is plotted as β changes. When , the quasi-static interaction energy of the four electric dipoles increases with the increase of β.

[0109] Fig.12The simulation results of the array unit under periodic boundary conditions are given when β = 30°, 37.5°, 45°, 52.5° and 60°. As β increases, the low-frequency magnetic resonance and high-frequency electric resonance move in opposite directions, thus realizing an electromagnetic periodic array structure with a band-stop characteristic with a stable center frequency and continuously adjustable bandwidth.

[0110] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. An electromagnetic periodic array structure, characterized in that: The invention comprises a plurality of first dielectric plates and a plurality of second dielectric plates, wherein the plurality of first dielectric plates are arranged at intervals along a first direction, and the plurality of second dielectric plates are arranged at intervals along a second direction, and the first direction intersects with the second direction; each of the first dielectric plates is pivotally connected with the plurality of second dielectric plates around a third direction to form a plurality of array units with openings in the form of parallelograms and variable angles, and the third direction is perpendicular to the first direction and the second direction.

2. The electromagnetic periodic array structure according to claim 1, characterized in that: The first dielectric plate has a plurality of first sockets arranged at intervals, and the second dielectric plate has a plurality of second sockets arranged at intervals. The first sockets are plugged into the second sockets in the third direction to achieve a pivotal connection between the first dielectric plate and the second dielectric plate.

3. The electromagnetic periodic array structure as claimed in claim 2, characterized in that: One of the first socket and the second socket is provided with a socket, the other of the first socket and the second socket is provided with an insertion rod, and the socket is plugged with the insertion rod in the third direction.

4. The electromagnetic periodic array structure according to claim 1, characterized in that: The spacing distance between any two adjacent first dielectric plates is equal, and the spacing distance between any two adjacent second dielectric plates is equal.

5. The electromagnetic periodic array structure as claimed in claim 4, characterized in that: The spacing distance between two adjacent first dielectric plates is equal to the spacing distance between two adjacent second dielectric plates.

6. The electromagnetic periodic array structure according to any one of claims 1 to 5, characterized in that: The first dielectric plate and the second dielectric plate have the same structure.

7. The electromagnetic periodic array structure according to any one of claims 1 to 5, characterized in that: The variable range of the angle is 20°-160°.

8. The electromagnetic periodic array structure according to any one of claims 1 to 5, characterized in that: A metal layer is provided on the inner wall and / or outer wall of the array unit.

9. The electromagnetic periodic array structure as claimed in claim 8, characterized in that: The metal layer is provided on the four inner walls or the four outer walls of the array unit.

10. The electromagnetic periodic array structure according to claim 8, characterized in that: The metal layer includes two independently arranged and rotationally symmetrical L-shaped metal layers.

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