Frequency selective surface unit, frequency selective surface structure and terminal device

Abstract

The embodiment of the present application provides a kind of frequency selective surface unit, frequency selective surface structure and terminal equipment, frequency selective surface unit includes: first dielectric substrate;Second dielectric substrate, with first dielectric substrate opposite arrangement;Liquid crystal layer, between first dielectric substrate and second dielectric substrate;First frequency selective surface layer, is set on first dielectric substrate;Second frequency selective surface layer, is set on second dielectric substrate.The embodiment of the present application is based on the adjustability of liquid crystal layer, by setting first frequency selective surface layer and second frequency selective surface layer, realize the adjustment of frequency selective surface unit between band-pass mode and band-stop mode, without introducing additional lumped element, the frequency selection pattern layer and control line layer of liquid crystal layer same side are all set on the same dielectric substrate, and wiring is flexible, so it has higher integration.

Description

Technical Field

[0001] This application relates to the field of display technology, and more specifically, to a frequency selective surface unit, a frequency selective surface structure, and a terminal device. Background Technology

[0002] Frequency selective surfaces (FSTs) are widely used in radomes, electromagnetic absorption, and electromagnetic protection due to their excellent electromagnetic properties. Traditional FSTs mostly employ passive structures, and once designed, their electromagnetic characteristics are fixed and cannot be dynamically adjusted. This makes it difficult to meet the dual requirements of current and future equipment window materials for electromagnetic communication / detection and low scattering characteristics.

[0003] The emergence of metamaterials has opened up an effective way to construct intelligent electromagnetic windows. By introducing active devices or using tunable materials in microstructural units, their electromagnetic responses can be dynamically controlled, achieving the integration of multiple electromagnetic functions. Currently, various dynamically tunable metamaterials reported in public often focus on the dynamic control of single electromagnetic characteristics (frequency, amplitude, direction, etc.), resulting in relatively limited functionality. Even though some multifunctional dynamic metamaterials have emerged, most can only operate in a single polarization state, failing to meet the application requirements of complex electromagnetic environments.

[0004] In summary, the existing frequency selection surface structures have the following technical problems: the use of RF switches to adjust the operating mode is not applicable to millimeter wave and above frequency bands, the system integration is low, and the control lines are prone to interfering with the frequency selection function. Summary of the Invention

[0005] This application addresses the shortcomings of existing methods by proposing a frequency selective surface unit, a frequency selective surface structure, and a terminal device to solve the technical problems existing in the frequency selective surface structure of the prior art: the use of radio frequency switches to adjust the working mode is not applicable to millimeter wave and above frequency bands, the system integration is low, and the control lines are prone to interfering with the frequency selection function.

[0006] In a first aspect, embodiments of this application provide a frequency-selective surface unit, comprising:

[0007] First dielectric substrate;

[0008] The second dielectric substrate is disposed opposite to the first dielectric substrate;

[0009] A liquid crystal layer is disposed between a first dielectric substrate and a second dielectric substrate;

[0010] A first frequency selection surface layer is disposed on a first dielectric substrate;

[0011] The second frequency selection surface layer is disposed on the second dielectric substrate.

[0012] In some embodiments of the present invention, the first frequency selection surface layer includes a first frequency selection pattern layer and a first control line layer, wherein the first control line is electrically connected to the first frequency selection pattern layer.

[0013] And / or, the second frequency selection surface layer includes a second frequency selection pattern layer and a second control line layer, wherein the second control line layer is electrically connected to the second frequency selection pattern layer.

[0014] In some embodiments of the present invention, the edge of the orthographic projection of the first frequency selective pattern layer on the liquid crystal layer is located within the coverage area of ​​the orthographic projection of the first dielectric substrate on the liquid crystal layer.

[0015] In some embodiments of the present invention, the first frequency selection pattern layer and the first control line layer are disposed on the same side of the first dielectric substrate.

[0016] In some embodiments of the present invention, a first frequency selection pattern layer is disposed on a first side of a first dielectric substrate, and a first control line layer is disposed on a second side of the first dielectric substrate opposite to the first side.

[0017] In some embodiments of the present invention, the orthographic projection of the first frequency-selective pattern layer on the liquid crystal layer at least partially overlaps with the orthographic projection of the second frequency-selective pattern layer on the liquid crystal layer.

[0018] In some embodiments of the present invention, the orthographic projection of the first frequency-selective pattern layer on the liquid crystal layer completely overlaps with the orthographic projection of the second frequency-selective pattern layer on the liquid crystal layer.

[0019] In some embodiments of the present invention, the orthographic projection of the first frequency-selective pattern layer on the liquid crystal layer has the same shape as the orthographic projection of the second frequency-selective pattern layer on the liquid crystal layer and forms a first angle.

[0020] In some embodiments of the present invention, a first frequency selective pattern layer is in contact with a first side of a first dielectric substrate, and a second frequency selective pattern layer is in contact with a second side of a second dielectric substrate. The first side and the second side form a second included angle, and the first included angle and the second included angle are equal.

[0021] In some embodiments of the present invention, a through hole is provided in the first frequency selection pattern layer.

[0022] In some embodiments of the present invention, a first bridging portion is provided in the first frequency selection pattern layer.

[0023] In some embodiments of the present invention, the orthographic projection outline of the first frequency-selective pattern layer on the first dielectric substrate is at least one of a cross shape, a circle, a square shape, a cross-shaped ring, a circular ring, and a square ring.

[0024] In a second aspect, embodiments of this application provide a frequency selective surface structure, including: at least two frequency selective surface units as described in the first aspect;

[0025] The frequency-selective surface units are arranged in an array.

[0026] Thirdly, embodiments of this application also provide a terminal device, including: a frequency selection surface structure as described in the second aspect, and a control board;

[0027] The first and second control line layers in the frequency selective surface structure are electrically connected to the control board, respectively.

[0028] In some embodiments of the present invention, at least some frequency selective surface units in the frequency selective surface structure are interconnected in a first direction and spaced apart in a second direction, and a first control line layer connects the frequency selective surface units and the control board along the second direction.

[0029] The beneficial technical effects of the technical solutions provided in this application include: Based on the tunability of the liquid crystal layer, this application achieves the adjustment of the frequency selection surface unit between bandpass mode and bandstop mode by setting a first frequency selection surface layer and a second frequency selection surface layer, without the need to introduce additional lumped elements. The frequency selection pattern layer and control line layer on the same side of the liquid crystal layer are both disposed on the same dielectric substrate, allowing for flexible routing and thus achieving high integration. Additional aspects and advantages of this application will be set forth in part in the description which follows, and will be obvious from the description or may be learned by practice of this application. Attached Figure Description

[0030] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein:

[0031] Figure 1 This is a cross-sectional schematic diagram of a frequency-selective surface element in one embodiment of this application;

[0032] Figure 2 This is a response curve of a frequency-selective surface element to a vertically incident electromagnetic wave in one embodiment of this application.

[0033] Figure 3 This is a response curve of a frequency-selective surface element to a vertically incident electromagnetic wave in another embodiment of this application.

[0034] Figure 4 This is a cross-sectional schematic diagram of the first frequency selection pattern layer in some embodiments of the present invention;

[0035] Figure 5 This is a schematic diagram of the structure of a frequency selective surface unit in one embodiment of this application;

[0036] Figure 6 This is a schematic diagram of the structure of a frequency-selective surface unit in another embodiment of this application;

[0037] Figure 7 This is a schematic diagram of the structure of a frequency selective surface unit in another embodiment of this application;

[0038] Figure 8 This is a schematic diagram of the structure of a terminal device in one embodiment of this application.

[0039] In the picture:

[0040] 101 - First dielectric substrate; 102 - First frequency selective surface layer (102a - First frequency selective pattern layer, 102b - First control layer); 103 - Liquid crystal layer; 104 - Second frequency selective surface layer (104a - Second frequency selective pattern layer, 104b - Second control layer); 105 - Second dielectric substrate; 106 - Control board. Detailed Implementation

[0041] This application is described in detail below. Examples of embodiments of this application are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar components or components having the same or similar functions throughout. Furthermore, detailed descriptions of known technologies that are unnecessary for the features of this application are omitted. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0042] It will be understood by those skilled in the art that, unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. It should also be understood that terms such as those defined in general dictionaries should be understood to have the same meaning as in the context of the prior art, and should not be interpreted in an idealized or overly formal sense unless specifically defined as herein.

[0043] Those skilled in the art will understand that, unless specifically stated otherwise, the singular forms “a,” “an,” “the,” and “the” used herein may also include the plural forms. It should be further understood that the term “comprising” as used in this application means the presence of the stated features, integers, steps, operations, elements, and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof. It should be understood that when we say an element is “connected” or “coupled” to another element, it can be directly connected or coupled to the other element, or there may be intermediate elements. Furthermore, “connected” or “coupled” as used herein can include wireless connections or wireless coupling. The term “and / or” as used herein includes all or any units and all combinations of one or more associated listed items.

[0044] Existing frequency selective surface architectures suffer from several technical problems: the use of RF switches to adjust the operating mode is unsuitable for millimeter-wave and higher frequency bands; system integration is low; and control lines are prone to interfering with the frequency selection function. The inventors of this application have discovered that as device design frequencies increase, especially in millimeter-wave and higher bands, the impact of lumped-parameter components on the circuit becomes significant due to the shorter wavelengths. Most existing adjustable frequency selective surface architectures use RF switches for operating mode adjustment, but this approach is no longer suitable for millimeter-wave and higher frequency bands. Furthermore, existing adjustable frequency selective surface architectures require specially designed control circuits for the location of the RF switch in the circuit, resulting in low system integration and the control lines easily interfering with the frequency selection function.

[0045] This application provides a frequency selective surface unit, a frequency selective surface structure, and a terminal device, aiming to solve the above-mentioned technical problems of the prior art. The technical solution of this application and how it solves the aforementioned technical problems are described in detail below with specific embodiments.

[0046] Firstly, embodiments of this application provide a frequency-selective surface unit. For example... Figure 1 As shown, Figure 1 This is a cross-sectional schematic diagram of a frequency selective surface element in one embodiment of this application. The frequency selective surface element includes:

[0047] First dielectric substrate 101;

[0048] The second dielectric substrate 105 is disposed opposite to the first dielectric substrate 101;

[0049] A liquid crystal layer 103 is disposed between a first dielectric substrate 101 and a second dielectric substrate 105;

[0050] The first frequency selection surface layer 102 is disposed on the first dielectric substrate 101;

[0051] The second frequency selection surface layer 104 is disposed on the second dielectric substrate 105.

[0052] Based on the adjustability of the liquid crystal layer 103, this embodiment of the application realizes the adjustment of the frequency selection surface unit between the bandpass mode and the bandstop mode by setting the first frequency selection surface layer 102 and the second frequency selection surface layer 104, without the need to introduce additional lumped elements.

[0053] It is understood that in some embodiments, the first frequency selective surface layer 102 is disposed on the surface of the first dielectric substrate 101 near the liquid crystal layer 103; in other embodiments, the first frequency selective surface layer 102 is disposed on the surface of the first dielectric substrate 101 away from the liquid crystal layer 103; and in still other embodiments, the first frequency selective surface layer 102 is disposed on both sides of the first dielectric substrate 101. The positional relationship between the second frequency selective surface layer 104 and the second dielectric substrate 105 is similar.

[0054] In some embodiments of the present invention, the first frequency selection surface layer 102 includes a first frequency selection pattern layer 102a and a first control line layer 102b, wherein the first control line 102b is electrically connected to the first frequency selection pattern layer 102a.

[0055] And / or, the second frequency selection surface layer 104 includes a second frequency selection pattern layer 104a and a second control line layer 104b, the second control line layer 104b being electrically connected to the second frequency selection pattern layer 104a.

[0056] The first control line layer includes a first control line, and the second control line layer includes a second control line. The first control line and the second control line control the first frequency selective pattern layer and the second frequency selective pattern layer to apply an electric field to the liquid crystal layer, causing the liquid crystal layer to shift and the equivalent dielectric constant of the liquid crystal layer to change. Through simulation, it was found that the frequency shift of the response curve is caused before and after the electric field is applied, that is, the frequency shift occurs at the junction of the filter passband and stopband, realizing the switching between the reflection mode and the transmission mode of the frequency selective surface unit.

[0057] In some embodiments, the first frequency selection pattern layer 102a and the first control layer 102b are disposed on the same layer; in other embodiments, the first frequency selection pattern layer 102a and the first control layer 102b are disposed on adjacent layers; in still other embodiments, the first frequency selection pattern layer 102a and the first control layer 102b are respectively disposed on both sides of the first dielectric substrate 101. The second frequency selection pattern layer 104a and the second control layer 104b are disposed similarly.

[0058] like Figure 2 and Figure 3 As shown, Figure 2This is a response curve of a frequency-selective surface element to a vertically incident electromagnetic wave in one embodiment of this application. Figure 3 This is a response curve of a frequency-selective surface element to a vertically incident electromagnetic wave, as shown in another embodiment of this application. The horizontal axis represents the frequency F of the electromagnetic wave, and the vertical axis represents the scattering parameter S, where the solid line represents the transmission coefficient and the dashed line represents the reflection parameter. Figure 2 Implementation examples and Figure 3 In the embodiments described, other parameters are basically the same, with the following differences: Figure 2 No electric field was applied to the frequency-selective surface element. Figure 3 An electric field has been applied to the frequency-selective surface element. Comparison shows that when the frequency F of the incident electromagnetic wave is near f0, the frequency-selective surface element achieves switching between bandpass and bandstop modes before and after the application of the electric field.

[0059] In some embodiments of the present invention, the orthographic projection of the first frequency selective pattern layer 102a on the liquid crystal layer 103 is located within the coverage area of ​​the orthographic projection of the first dielectric substrate 101 on the liquid crystal layer 103.

[0060] In some embodiments, to facilitate the formation of a periodic array structure by multiple frequency selective surface units in subsequent processes, the orthographic projection of the first frequency selective pattern layer 102a and the orthographic projection edge of the first dielectric substrate 101 coincide in the multiple frequency selective surface units. When the orthographic projection edges of the multiple first dielectric substrates are located in the same direction, the first control line layer 102b can be traced along this direction or in a direction parallel to this direction, that is, the trace direction of the first control line layer 102b is a straight line.

[0061] In other embodiments, the orthographic projection of the first frequency selective pattern layer 102a does not coincide with the edge of the orthographic projection of the first dielectric substrate 101. When multiple frequency selective surface units form a periodic array structure in subsequent processes, the first control line layer 102b needs to extend towards the first frequency selective pattern layer 102a, and the routing path of the first control line layer 102b is wavy or square-shaped.

[0062] In some embodiments of the present invention, the first frequency selection pattern layer 102a and the first control line layer 102b are disposed on the same side of the first dielectric substrate 101.

[0063] In one embodiment, the first control line layer 102b and the first frequency selection pattern layer 102a are disposed in the same layer and are both disposed on the surface of the first dielectric substrate 101 near the liquid crystal layer 103.

[0064] In another embodiment, the first control line layer 102b and the first frequency selection pattern layer 102a are disposed in the same layer and are both disposed on the surface of the first dielectric substrate 101 away from the liquid crystal layer 103.

[0065] In some embodiments of the present invention, a first frequency selection pattern layer 102a is disposed on a first side of a first dielectric substrate 101, and a first control line layer 102b is disposed on a second side of the first dielectric substrate 101 opposite to the first side.

[0066] In one embodiment, the first control line layer 102b and the first frequency selection pattern layer 102a are different layers. The first control line layer 102b is disposed on the surface of the first dielectric substrate 101 away from the liquid crystal layer 103, and the first frequency selection pattern layer 102a is disposed on the surface of the first dielectric substrate 101 close to the liquid crystal layer 103.

[0067] In another embodiment, the first control line layer 102b and the first frequency selection pattern layer 102 are different layers. The first control line layer 102b is disposed on the surface of the first dielectric substrate 101 near the liquid crystal layer 103, and the first frequency selection pattern layer 102a is disposed on the surface of the first dielectric substrate 101 away from the liquid crystal layer 103.

[0068] In the two embodiments described above, since the first frequency selection pattern layer 102a and the first control line layer 102b cannot be in direct contact, when multiple frequency selection surface units form a periodic array structure in subsequent processes, multiple vias are made by drilling the first dielectric substrate 101 of some units. The first control line layer 102b is connected to the first frequency selection pattern layer 102a through the vias, and the routing path of the first control line layer 102b is wavy or square.

[0069] The frequency selection pattern layer and control line layer on the same side of the liquid crystal layer are both set on the same dielectric substrate, allowing for flexible routing and thus achieving high integration.

[0070] It is worth mentioning that although this application only mentions some technical features of the first dielectric substrate 101 and the first frequency selective surface layer 102, and does not describe the second dielectric substrate 105 and the second frequency selective surface layer 104, since only the first dielectric substrate 101 and the second dielectric substrate 105 are constrained to be arranged opposite each other, the two can be interchanged. In some embodiments, the second dielectric substrate 105 and the second frequency selective surface layer 104 also have the same technical features, which will not be repeated hereafter.

[0071] In some embodiments of the present invention, the orthographic projection of the first frequency selective pattern layer 102a onto the liquid crystal layer 103 at least partially overlaps with the orthographic projection of the second frequency selective pattern layer 104a onto the liquid crystal layer 103.

[0072] In this embodiment, the first frequency selective pattern layer 102a and the second frequency selective pattern layer 104a receive signals from the first control line layer 102b and the second control line layer 104b, respectively. In order to ensure effective control of the liquid crystal layer 103, the orthographic projections of the two layers at least partially overlap to form a voltage difference, generate an electric field, and drive the liquid crystal molecules to deflect.

[0073] In some embodiments of the present invention, the orthographic projection of the first frequency selective pattern layer 102a on the liquid crystal layer 103 is completely superimposed on the orthographic projection of the second frequency selective pattern layer 104a on the liquid crystal layer 103.

[0074] In one embodiment, the first frequency selective pattern layer 102a and the second frequency selective pattern layer 104a have the same shape and are positioned corresponding to each other, and their orthogonal projections onto the liquid crystal layer 103 completely overlap.

[0075] In some embodiments of the present invention, the orthographic projection of the first frequency selective pattern layer 102a onto the liquid crystal layer 103 has the same shape as the orthographic projection of the second frequency selective pattern layer 104a onto the liquid crystal layer 103 and forms a first angle.

[0076] In another embodiment, the first frequency selection pattern layer 102a and the second frequency selection pattern layer 104a have the same shape, and the orthographic projection of the former can be completely superimposed on the orthographic projection of the latter after being rotated by a certain angle. In yet another embodiment, the first frequency selection pattern layer 102a and the second frequency selection pattern layer 104a have the same shape, and the orthographic projection of the former can be completely superimposed on the orthographic projection of the latter after being flipped.

[0077] In some embodiments of the present invention, the first frequency selection pattern layer 102a is in contact with the first side of the first dielectric substrate 101, and the second frequency selection pattern layer 104a is in contact with the second side of the second dielectric substrate 105. The first side and the second side form a second included angle, and the first included angle and the second included angle are equal.

[0078] In this embodiment, the cross-sectional shapes of the first dielectric substrate 101 and the second dielectric substrate 105 are both square or other regular shapes. The first frequency selective pattern layer 102a is in contact with the first side 101a of the first dielectric substrate 101, and the second frequency selective pattern layer 104a is in contact with the second side 105a of the second dielectric substrate 105. The first side 101a and the second side 105a are both straight sides. When the orthographic projection of the first frequency selective pattern layer 102a is rotated by a certain angle, it coincides with the orthographic projection of the second frequency selective pattern layer 104a. At this time, the first side 101a and the second side 105a also form the included angle.

[0079] like Figure 4 As shown, Figure 4This is a cross-sectional schematic diagram of the first frequency selective pattern layer in some embodiments of the present invention. In some embodiments of the present invention, the orthographic projection outline of the first frequency selective pattern layer 102a on the first dielectric substrate 101 is at least one of a cross shape, a circle, a square, and a cross-shaped ring, a circular ring, and a square ring. In other embodiments, the orthographic projection outline of the first frequency selective pattern layer 102a on the first dielectric substrate 101 is a variation of the above-mentioned pattern, such as a Jerusalem cross as a variation of the cross shape. In still other embodiments, the through-holes formed on the first frequency selective pattern layer 102a are rectangular holes or circular holes.

[0080] In some embodiments of the present invention, the material of the first dielectric substrate 101 includes glass, printed circuit board or ceramic; the material of the first frequency selection pattern layer 102a includes copper, aluminum, silver, nickel, conductive plastic, conductive rubber or conductive glass; the material of the first control line layer 102b includes copper, aluminum, silver, nickel, conductive plastic, conductive rubber or conductive glass.

[0081] In a specific embodiment, such as Figure 5 As shown, Figure 5 This is a schematic diagram of the structure of a frequency-selective surface unit in one embodiment of this application. Both the first and second dielectric substrates are square substrates made of glass, with a side length L = 2 mm and a thickness Hs = 1 mm; the liquid crystal layer has a side length L = 2 mm, a thickness Hlc = 0.1 mm, and an anisotropic dielectric constant Δe = 2.

[0082] This embodiment employs a relatively thick dielectric substrate and a relatively thick liquid crystal layer to enhance the steepness of the pass-stop band junction of the frequency selective surface unit. It is understood that the specific values ​​in this embodiment are only applicable to this specific use case. In other embodiments, the specific thicknesses of the dielectric substrate and liquid crystal layer should be flexibly selected based on the same inventive purpose, according to different operating frequency bands of the incident electromagnetic wave and different frequency selection patterns. The dielectric substrate may include a single-layer substrate and a multilayer substrate after lamination.

[0083] In this embodiment, the orthographic projection of the first frequency selective pattern layer 102a on the liquid crystal layer 103 and the orthographic projection of the second frequency selective pattern layer 104a on the liquid crystal layer 103 completely coincide. The edge of the first frequency selective pattern layer 102a in contact with the first dielectric substrate 101 is in the first direction, and the edge of the second frequency selective pattern layer 104a in contact with the second dielectric substrate 105 is also in the first direction. The purpose is to facilitate the routing of control lines after forming a periodic array structure.

[0084] In this embodiment, the first frequency selection pattern layer 102a and the second frequency selection pattern layer 104a adopt a cross shape, and a rectangular through hole is opened on at least one arm of the cross shape. The purpose is to reduce the overall single-layer pattern area while ensuring the overlapping area of ​​the upper and lower patterns, so as to facilitate the control of the liquid crystal by the electric field.

[0085] The response curve obtained through simulation is as follows: Figure 3 and Figure 4 As shown, f0 = 43.3 GHz, at which point the frequency selection surface unit completes the switching between bandpass mode and bandstop mode.

[0086] In another specific embodiment, such as Figure 6 As shown, Figure 6 This is a schematic diagram of the structure of a frequency selective surface unit in another embodiment of this application. In this embodiment, the orthographic projection of the first frequency selective pattern layer 102a is rotated 90° to coincide with the orthographic projection of the second frequency selective pattern layer 104a. The first frequency selective pattern layer 102a is in contact with the first edge 102c of the first dielectric substrate in the first direction, and the second frequency selective pattern layer 104a is in contact with the second edge 104c of the second dielectric substrate in the second direction. The first edge and the second edge are also at a 90° angle.

[0087] In some embodiments of the present invention, a through hole is provided in the first frequency selection pattern layer 102a.

[0088] In some embodiments, changing the dielectric constant of the liquid crystal layer 103 requires ensuring the overlapping area of ​​the first frequency selective pattern layer 102a and the second frequency selective pattern layer 104a, i.e., the area where their orthogonal projections on the liquid crystal layer 103 coincide. While ensuring the overlapping area, it is also necessary to ensure that the first frequency selective pattern layer 102a has sufficient transmission parameters for electromagnetic waves in some application scenarios. In this embodiment, it is necessary to reduce the area of ​​the first frequency selective pattern layer 102a and the second frequency selective pattern layer 104a. Therefore, slots can be made in the first frequency selective pattern layer 102a to reduce its area.

[0089] In some embodiments of the present invention, a first bridging portion 102c is provided in the first frequency selection pattern layer 102a.

[0090] In other embodiments, such as Figure 7 As shown, Figure 7This is a schematic diagram of the structure of a frequency selective surface unit in another embodiment of this application. Although the first frequency selective pattern layer 102a can achieve some functions, its small overlapping area makes it unable to effectively control the liquid crystal layer 103. In this case, a first bridging portion 102c needs to be designed on the first frequency selective pattern layer 102a, and the orthographic projection of the first bridging portion on the liquid crystal layer 103 should at least partially overlap with the orthographic projection of the second frequency selective pattern layer 104a on the liquid crystal layer 103; or, a second bridging portion 104c should also be designed on the second frequency selective pattern layer 104a, and the orthographic projection of the first bridging portion 102c on the liquid crystal layer 103 should at least partially overlap with the orthographic projection of the second bridging portion 104c on the liquid crystal layer 103.

[0091] Based on the same inventive concept, in a second aspect, embodiments of this application provide a frequency selective surface structure, including: at least two frequency selective surface units as described in the first aspect;

[0092] The frequency-selective surface units are arranged in an array.

[0093] Based on the same inventive concept, in a third aspect, embodiments of this application also provide a terminal device, such as... Figure 8 As shown, Figure 8 This is a schematic diagram of the structure of a terminal device in one embodiment of this application. The terminal device includes: a frequency selection surface structure as described in the second aspect, and a control board 106;

[0094] The first control line layer 102b and the second control line layer 104b in the frequency selective surface structure are electrically connected to the control board 106, respectively.

[0095] In some embodiments of the present invention, at least some of the frequency selective surface units in the frequency selective surface structure are interconnected in the first direction Rx and spaced apart in the second direction Ry. The first control line layer 102b connects the frequency selective surface units and the control board 106 along the second direction Ry.

[0096] In this embodiment, the figure shows an array composed of multiple first frequency selection pattern layers 102a. When the orthographic projection of the undrawn second frequency selection pattern layer 104a completely coincides with the orthographic projection of the first frequency selection pattern layer 102a, the routing direction of the second control line layer 104b is the same as the routing direction of the first control line layer 102b, both connecting the frequency selection surface unit and the control board 106 along the second direction Ry.

[0097] In another embodiment, when the orthographic projection of the first frequency selection pattern layer 102a is rotated 90° and completely coincides with the orthographic projection of the undrawn second frequency selection pattern layer 104a, the second frequency selection pattern layer 104a is interconnected in the second direction Ry and spaced apart in the first direction Rx. Then, the routing direction of the second control line layer 104b is 90° with the routing direction of the first control line layer 102b, and the second control line layer 104b connects the frequency selection surface unit and the control board 106 along the first direction Rx.

[0098] By applying the embodiments of this application, at least the following beneficial effects can be achieved: Based on the adjustability of the liquid crystal layer, the embodiments of this application realize the adjustment of the frequency selection surface unit between the bandpass mode and the bandstop mode by setting a first frequency selection surface layer and a second frequency selection surface layer, without the need to introduce additional lumped elements. The frequency selection pattern layer and the control line layer on the same side of the liquid crystal layer are both set on the same dielectric substrate, which allows for flexible routing and thus has a high degree of integration.

[0099] Those skilled in the art will understand that the steps, measures, and solutions in the various operations, methods, and processes discussed in this application can be alternated, modified, combined, or deleted. Furthermore, other steps, measures, and solutions in the various operations, methods, and processes discussed in this application can also be alternated, modified, rearranged, decomposed, combined, or deleted. Furthermore, steps, measures, and solutions in the prior art that are similar to those disclosed in this application can also be alternated, modified, rearranged, decomposed, combined, or deleted.

[0100] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0101] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0102] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0103] In the description of this specification, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0104] It should be understood that although the steps in the flowcharts of the accompanying figures are shown sequentially as indicated by the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the flowcharts of the accompanying figures may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily completed at the same time, but can be executed at different times, and their execution order is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the sub-steps or stages of other steps.

[0105] The above description is only a partial embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A frequency selective surface unit, characterized by The application relates to a frequency selective surface structure, comprising: a first dielectric substrate; a second dielectric substrate, arranged opposite to the first dielectric substrate; a liquid crystal layer, arranged between the first dielectric substrate and the second dielectric substrate; a first frequency selective surface layer, arranged on the first dielectric substrate; a second frequency selective surface layer, arranged on the second dielectric substrate; wherein the first dielectric substrate and the second dielectric substrate comprise a laminated multi-layer substrate; the first frequency selective surface layer comprises a first frequency selective pattern layer, and the second frequency selective surface layer comprises a second frequency selective pattern layer, the first frequency selective pattern layer and the second frequency selective pattern layer adopt a cross shape, and a plurality of rectangular through holes are arranged on at least one arm of the cross shape; the first frequency selective pattern layer comprises a first bridge portion, and the second frequency selective pattern layer comprises a second bridge portion, and the orthographic projection of the first bridge portion on the liquid crystal layer at least partially overlaps with the orthographic projection of the second bridge portion on the liquid crystal layer.

2. The frequency selective surface unit of claim 1, wherein, the first frequency selective surface layer further comprises a first control line layer, and the first control line is electrically connected with the first frequency selective pattern layer; and / or, the second frequency selective surface layer further comprises a second control line layer, and the second control line layer is electrically connected with the second frequency selective pattern layer.

3. The frequency selective surface unit of claim 2, wherein, the orthographic projection of the first frequency selective pattern layer on the liquid crystal layer is located in the covering range of the orthographic projection of the first dielectric substrate on the liquid crystal layer.

4. The frequency selective surface unit of claim 2, wherein, the first frequency selective pattern layer and the first control line layer are arranged on the same side of the first dielectric substrate.

5. The frequency selective surface unit of claim 2, wherein, the first frequency selective pattern layer is arranged on the first side of the first dielectric substrate, and the first control line layer is arranged on the second side of the first dielectric substrate, which is opposite to the first side.

6. The frequency selective surface unit of claim 2, wherein, the orthographic projection of the first frequency selective pattern layer on the liquid crystal layer at least partially overlaps with the orthographic projection of the second frequency selective pattern layer on the liquid crystal layer.

7. The frequency selective surface unit of claim 6, wherein, the orthographic projection of the first frequency selective pattern layer on the liquid crystal layer completely overlaps with the orthographic projection of the second frequency selective pattern layer on the liquid crystal layer.

8. The frequency selective surface unit of claim 6, wherein, the orthographic projection of the first frequency selective pattern layer on the liquid crystal layer is identical in shape with the orthographic projection of the second frequency selective pattern layer on the liquid crystal layer, and forms a first included angle.

9. The frequency selective surface unit of claim 8, wherein, the first frequency selective pattern layer is in contact with a first edge of the first dielectric substrate, and the second frequency selective pattern layer is in contact with a second edge of the second dielectric substrate, the first edge forms a second included angle with the second edge, and the first included angle is equal to the second included angle.

10. The frequency selective surface unit of claim 6, wherein, a through hole is arranged in the first frequency selective pattern layer.

11. A frequency selective surface structure, characterized in that The application further relates to a frequency selective surface structure, comprising: at least two frequency selective surface units as claimed in any one of claims 1-10; the frequency selective surface units are arranged in an array.

12. A terminal device, comprising: The application further relates to a frequency selective surface structure, comprising: the frequency selective surface structure as claimed in claim 11, and a control board; the first control line layer and the second control line layer in the frequency selective surface structure are respectively electrically connected with the control board.

13. The terminal device according to claim 12, characterized by at least part of the frequency selective surface units in the frequency selective surface structure are in communication with each other in a first direction, and are arranged in an interval in a second direction; the first control line layer connects the frequency selective surface units with the control board along the second direction.

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