Metamaterial antenna housing
By setting multiple metamaterial units inside the radome and adopting a single-layer A-layer sandwich structure with regular polygonal metal sheet design, the problems of grating lobe interference and multi-layer structure error in broadband FSS design are solved, achieving low-cost, high-performance electromagnetic wave transmission and reflection effects.
Patent Information
- Application Number
- CN202520579826.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-31
- Publication Date
- 2026-02-27
- Estimated Expiration
- 2035-03-31
AI Technical Summary
Existing radomes lack mature methods for broadband FSS design, are prone to grating lobe interference, and have large processing errors and high costs due to their multi-layer structure.
Multiple metamaterial units are used, including regular polygonal metal sheets. The microstructures form an A-layer structure between the prepregs, designed to be arranged in an octagonal pattern. The center of the microstructure coincides with the center of the metamaterial and has rectangular or triangular notches, etc., to achieve a single-layer structure.
It achieves broadband transmission of PC band and reflection of Ku-Ka band electromagnetic waves, with low insertion loss, good angle and polarization stability, low signal loss, stopband total reflection, reduced cost and reduced grating lobe interference.
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Figure CN223956833U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to antenna cover technology, more particularly, to a metamaterial antenna cover. BACKGROUND
[0002] The existing antenna cover is generally implemented by using a periodic frequency selective surface structure. The current research and application of the frequency selective surface (FSS) mainly focuses on designing and implementing two types of high-performance band-pass selection and band-stop reflection. In the FSS for implementing the band-pass selection performance, the narrow-band FSS and the multi-band FSS have been relatively mature, while there is no mature idea and method for designing the wide-band FSS. The common single-layer metal frequency selective surface structure can realize the narrow-band spatial filtering or the selective cross wide-band spatial filtering. With the complexity and fractal depth of the frequency selective surface structure unit and the increase of the center frequency, the designed structure is more likely to have grating lobe interference. CONTENT
[0003] The present application solves the above problems by the following scheme: an antenna cover is provided, and the antenna cover is internally provided with a plurality of metamaterial units. The metamaterial unit comprises at least one microstructure, the microstructure is a regular polygon metal sheet, and a notch is formed on the edge of the metal sheet towards a center point.
[0004] Preferably, the microstructure is a hexagonal metal sheet.
[0005] Preferably, the notch is a rectangular notch, a triangular notch or a semicircular notch.
[0006] Preferably, the metamaterial unit is an A sandwich structure, and the microstructure is arranged between two pre-pregs.
[0007] Preferably, the cross section of the metamaterial unit is a regular octagon.
[0008] Preferably, the center point of the microstructure coincides with the center point of the cross section of the metamaterial.
[0009] Preferably, the symmetry axis of the microstructure coincides with the symmetry axis of the cross section of the metamaterial.
[0010] Preferably, the cross section of the metamaterial unit is a regular octagon, and the length of the side of the octagon is 0.60mm to 0.65mm; the thickness of the metamaterial unit is 3.00mm to 3.05mm.
[0011] Preferably, the length of the side of the hexagon of the microstructure is 0.65mm to 0.72mm.
[0012] Preferably, the rectangular notch extends towards the center by a length of 0.32mm to 0.38mm, and the width of the notch is 0.16mm to 0.20mm.
[0013] The antenna cover microstructure unit has the characteristics of transmitting P-C wave band and reflecting Ku-Ka wave band electromagnetic waves, and has low insertion loss, good angle stability and polarization stability; the wave transmission performance in the passband is good, the signal loss is small, the stop band performance is good, and almost full reflection is achieved; the octagonal arrangement mode of the frequency selective surface is used, the unit is more compact, the frequency of the grating lobe and the surface wave singularity is improved, the frequency selective surface has a wider working frequency band; the single-layer frequency selective surface structure is simple and has low cost, and is different from the multi-layer structure processing which can cause errors. BRIEF DESCRIPTION OF DRAWINGS
[0014] The accompanying drawings, which are incorporated into and constitute a part of the specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the application.
[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the accompanying drawings needed to be used in the embodiments or prior art description will be briefly introduced. Obviously, for those skilled in the art, other drawings can also be obtained without creative labor.
[0016] Figure 1 It is a cross-sectional view of the antenna cover of an embodiment of the present application;
[0017] Figure 2 It is a top view of the antenna cover of an embodiment of the present application;
[0018] Figure 3 It is a structure diagram of the metamaterial unit in the antenna cover of an embodiment of the present application;
[0019] Figure 4 It is a schematic diagram of the microstructure in the metamaterial unit of an embodiment of the present application;
[0020] Figure 5 It is an electromagnetic characteristic curve of a single microstructure;
[0021] Figure 6 It is an electromagnetic characteristic curve of the microstructure from 0 to 40 degrees. DETAILED DESCRIPTION
[0022] In order to make the personnel in the technical field better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor should belong to the scope of protection of the present application.
[0023] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.
[0024] like Figure 1 and Figure 2 The figures shown are a cross-sectional view and a top view of a preferred embodiment of the metamaterial radome of this utility model. The outer surface of the radome is curved and symmetrical along the axial direction, with the height gradually decreasing from the middle to both ends. The antenna shaping components smoothly transition to the end ribs, reducing their electrical discontinuities and minimizing step scattering at the connection points. Absorption technology (blue area) is used to reduce lateral scattering of the antenna. Impedance matching technology is used to design the assembly boundaries, further reducing step scattering. The outer surface diagonal dimensions of the radome are approximately 1500mm * 1100mm. The interior of the radome is a chamfered rhomboid cavity structure, 1200mm long and 900mm wide, with a cavity height of 650mm. The height difference from the middle to both ends is 360mm. Multiple metamaterial units are provided within the radome, which are used to achieve PC band transmission and Ku-Ka band reflection.
[0025] In a feasible example, a metamaterial unit structure such as Figure 3 As shown, the metamaterial unit adopts an A-sandwich structure, which involves placing microstructures between two layers of prepreg. The microstructures are made of metallic copper and are connected to the prepreg via an adhesive film. The microstructures are arranged in an octagonal pattern, which helps to achieve a wider bandwidth. The unit's outer ring and inner toothed design further extends the low-frequency transmission bandwidth to some extent.
[0026] microstructures such as Figure 4 As shown, the main structure includes a polygonal shape, with notches on each side of the main structure pointing towards the center. In this embodiment, the main structure is a regular hexagon, and the notches are rectangular.
[0027] use Figure 4 The dimensions of the embodiment are as follows: the metamaterial unit size is 1.52mm, that is, the distance between two opposite sides of the octagon is 1.52mm, the side length 'a' of the octagon is 0.63mm, and the thickness of the metamaterial ( Figure 3The body structure length of the hexagonal microstructure is 0.69 mm, and a rectangular notch with a width c of 0.19 mm extending to a center d of 0.36 mm is arranged from the body structure length point.
[0028] The center point of the hexagonal body structure coincides with the center point of the octagonal metamaterial unit.
[0029] In the embodiment, the hexagonal body structure and the octagonal metamaterial unit have a coinciding symmetry axis.
[0030] The dimensions in the above embodiments are not the only values that can be achieved, and can be flexibly adjusted according to the actual radome size, electromagnetic response characteristic design requirements.
[0031] For example, in another achievable example, the dimensions are as follows: the metamaterial unit size is 1.45 mm, the octagonal edge length is 0.60 mm, and the metamaterial thickness is 3.00 mm; the body structure length of the hexagonal microstructure is 0.65 mm, and a rectangular notch with a width of 0.16 mm extending to a center of 0.32 mm is arranged from the body structure length point.
[0032] In another achievable example, the dimensions are as follows: the metamaterial unit size is 1.57 mm, the octagonal edge length is 0.65 mm, and the metamaterial thickness is 3.05 mm; the body structure length of the hexagonal microstructure is 0.72 mm, and a rectangular notch with a width of 0.20 mm extending to a center of 0.38 mm is arranged from the body structure length point.
[0033] In other embodiments of the utility model, the notch shape can also be other shapes, such as a triangle, a semicircle, etc.
[0034] After the structure and the dimensions are adopted Figure 4 , electromagnetic tests are performed on related radomes, and the responses at different frequencies and different angles are tested.
[0035] As shown in Figure 5 , the electromagnetic characteristic curve of a single microstructure, from the S11 curve (reflection characteristic curve) and the S21 curve (transmission characteristic curve), it can be seen that the transmission rate is 90% at 0-8.9 GHz, and the absorption rate is more than 95% at 17.5-40 GHz. Figure 6 As shown in Figure 6 , the absorption and transmission performance of the microstructure unit within the incident angle range of 0-40°, the curves are not seriously separated, and the absorption and transmission performance of the microstructure unit has angle stability.
[0036] The specific examples in the embodiment can refer to the examples described in the above embodiments and exemplary embodiments, and the embodiment will not be described here.
[0037] The antenna cover microstructure unit has the characteristics of transmitting P-C wave band and reflecting Ku-Ka wave band electromagnetic waves, has low insertion loss, has good angle stability and polarization stability, has good wave transmission performance in a passband, small signal loss, good stop band performance and almost full reflection, the octagonal arrangement mode of the frequency selective surface is used, the unit is more compact, the frequency of grating lobes and surface wave singularity is improved, the frequency selective surface has a wider working frequency band, the single-layer frequency selective surface structure is simple and has low cost, and unlike a multi-layer structure, error caused by processing is avoided, and the single-layer frequency selective surface has great significance in actual engineering.
[0038] The above merely describes preferred embodiments of the present application and is not intended to limit the present application. The present application can be variously changed and modified by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the principles of the present application shall be included in the protection scope of the present application.
Claims
1. An antenna cover, characterized by, The antenna cover is internally provided with a plurality of metamaterial units (100), the metamaterial unit (100) comprises at least one microstructure (200), the microstructure (200) is a regular polygon metal sheet, and a notch is formed in the edge of the metal sheet and extends to a center point.
2. The antenna cover according to claim 1, characterized in that, The microstructure (200) is a hexagonal metal sheet.
3. The antenna cover of claim 1, wherein, The notch is a rectangular notch, a triangular notch or a semicircular notch.
4. The antenna cover of claim 1, wherein, The metamaterial unit (100) is an A sandwich structure, and the microstructure (200) is arranged between two prepregs.
5. The antenna cover of claim 1, wherein, The cross section of the metamaterial unit (100) is a regular octagon.
6. The antenna cover of claim 1, wherein, The center point of the microstructure (200) coincides with the center point of the cross section of the metamaterial unit (100).
7. The antenna cover of claim 1, wherein, The symmetry axis of the microstructure (200) coincides with at least one symmetry axis of the cross section of the metamaterial unit (100).
8. The antenna cover of claim 5, wherein, The cross section of the metamaterial unit (100) is a regular octagon with a side length of 0.60mm-0.65mm, and the thickness of the metamaterial unit (100) is 3.00mm-3.05mm.
9. The antenna cover of claim 2, wherein, The side length of the microstructure (200) is 0.65mm-0.72mm.
10. The antenna cover of claim 3, wherein, The rectangular notch extends to the center by a length of 0.32mm-0.38mm, and the width of the rectangular notch is 0.16mm-0.20mm.