Shell with band elimination filtering function based on artificial magnetic conductor
By setting an artificial magnetic conductor array on the inner surface of the microwave circuit housing and using 3D printing technology to prepare magnetic conductor units with specific structures, the problems of structural complexity and radiation loss caused by the increase of filter components in microwave circuits are solved, achieving the effects of simplifying the structure, reducing costs, and suppressing electromagnetic interference.
Patent Information
- Application Number
- CN202423162175.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-20
- Publication Date
- 2026-02-27
- Estimated Expiration
- 2034-12-20
AI Technical Summary
Adding extra filtering components to existing microwave circuits leads to complex structures and increased size, and the radiation loss of high-frequency components is severe, affecting transmission efficiency and causing electromagnetic interference.
A band-stop filtering functional housing based on artificial magnetic conductors is adopted. By setting an array of artificial magnetic conductors on the inner surface of the housing and using 3D printing technology, a magnetic conductor unit array with a specific structure is formed to achieve a band-stop filtering effect of 31GHz-35GHz.
It simplifies the microwave circuit structure, reduces costs, minimizes radiation losses of high-frequency components, effectively suppresses electromagnetic interference, and enables selective filtering of the microstrip line transmission band.
Smart Images
Figure CN223957740U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the field of artificial magnetic conductor and filter technology, especially to a shell with band elimination filter function based on artificial magnetic conductor. BACKGROUND
[0002] With the development of new electromagnetic material technology, metamaterial has become one of the research hotspots in the microwave field. Among them, the artificial magnetic conductor structure has the same phase reflection characteristic and has the magnetic conductor characteristic in the appropriate frequency band range, which can obviously improve the performance of microwave circuits, microwave antennas and laser cavities.
[0003] At present, the artificial magnetic conductor structure mainly focuses on improving the antenna gain and transmission efficiency and is less applied in circuits. Meanwhile, in the microwave circuit, high-frequency components are prone to radiation loss in the high-frequency band, resulting in reduced transmission efficiency and causing electromagnetic interference to the surrounding circuit.
[0004] In order to suppress electromagnetic interference in the prior art, additional filter elements are usually added in the microwave circuit, resulting in complex microwave circuit structure and increased volume. Therefore, a microwave circuit shell with band elimination filter function is needed to suppress the radiation loss of high-frequency components. SUMMARY
[0005] In view of the above analysis, the utility model aims to provide a shell with band elimination filter function based on artificial magnetic conductor to solve the problem of complex microwave circuit structure and increased volume caused by adding additional filter elements in the microwave circuit in the prior art.
[0006] The utility model mainly aims to realize the following technical scheme:
[0007] A shell with band elimination filter function based on artificial magnetic conductor, the shell appearance is a cuboid structure, the artificial magnetic conductor array is arranged on the inner surface of the cuboid top cover, and the artificial magnetic conductor array is formed by arranging a plurality of same artificial magnetic conductor structure units.
[0008] Further, each artificial magnetic conductor structure unit is obtained by the following steps: in the space rectangular coordinate system, on the z=0 plane, three straight lines x=0, x=1.5 and y=0 and straight line The planar figure is rotated 90° along the z-axis positive direction to form a three-dimensional figure, the three-dimensional figure is cut by two planes y=0.6 and z=0.6 to remove a first corner block with y>0.6 and a second corner block with z>0.6, and a remaining three-dimensional figure is obtained, the remaining three-dimensional figure is cut by two planes z=0.3 and y=0.3 to remove a third corner block with z>0.3 and y>0.3 to form an opening, and an artificial magnetic conductor structure unit with the opening is obtained.
[0009] Further, the top surface of the artificial magnetic conductor unit is L-shaped, the bottom surface is a sector with a central angle of 90°, and the opening surface is trapezoidal.
[0010] Further, the openings of every four artificial magnetic conductor structure units are oppositely combined to form an artificial magnetic conductor unit combination, and the distance between the upper and lower adjacent artificial magnetic conductor structure units in each artificial magnetic conductor unit combination is 0.5 mm.
[0011] Further, the outer surfaces of the multiple same artificial magnetic conductor unit combinations are abutted to form an artificial magnetic conductor array, and the sector bottom surface of each artificial magnetic conductor structure unit in the artificial magnetic conductor array is in contact with the upper cover of the shell.
[0012] Further, the outer dimensions of the shell are 22mm*22mm*5.75mm.
[0013] Further, the thicknesses of the top cover and the bottom cover of the shell are both 0.5mm, and the thickness of the side wall of the shell is 3.65mm.
[0014] Further, the materials of the shell and the artificial magnetic conductor array are both copper.
[0015] Further, the band-stop filtering frequency band range of the shell is 31GHz-35GHz, and the center frequency is 33GHz.
[0016] Further, the artificial magnetic conductor array covers the inner surface of the top cover of the shell.
[0017] Compared with the prior art, the shell with the band-stop filtering function based on the artificial magnetic conductor can at least realize one of the following beneficial effects:
[0018] 1、the shell with the band-stop filtering function based on the artificial magnetic conductor, the top cover of the shell is a rectangular parallelepiped, and the inner surface of the top cover is provided with an artificial magnetic conductor array, the artificial magnetic conductor array is formed by arranging multiple same artificial magnetic conductor structure units, in a rectangular coordinate system, on the z=0 plane, three straight lines x=0, x=1.5 and y=0 and a straight line The plane figure is rotated 90° along the z-axis positive direction to form a solid figure, the solid figure is cut by y=0.6 and z=0.6 to remove the first corner block of y>0.6 and the second corner block of z>0.6, and the remaining solid figure is cut by z=0.3 and y=0.3 to remove the third corner block of z>0.3 and y>0.3 to form an opening, and the artificial magnetic conductor structure unit with the opening is obtained.The artificial magnetic conductor array is used in the design of a circuit board shell, and the band-stop filtering frequency band ranges from 31GHz to 35GHz, and the center frequency is 33GHz.The selection of the microstrip line transmission wave band is realized, and part of the high-order harmonics can be effectively filtered out.
[0019] 2、The utility model discloses a kind of top cover inner surfaces of shell with band-stop filtering function based on artificial magnetic conductor, which is prepared using 3D printing technology, with the characteristics of low cost and simple process.
[0020] In the utility model, the above technical solutions can be combined with each other to realize more preferred combination solutions. Other features and advantages of the utility model will be described in the following content, and some advantages can become apparent from the description or be understood by implementing the utility model. The purpose and other advantages of the utility model can be realized and obtained through the content specifically pointed out in the text and the drawings. BRIEF DESCRIPTION OF DRAWINGS
[0021] The drawings are only used for the purpose of illustrating specific embodiments and are not considered as limiting the utility model. In the entire drawings, the same reference signs represent the same components.
[0022] Figure 1 It is a kind of shell structure schematic diagram based on artificial magnetic conductor with band-stop filtering function;
[0023] Figure 2 It is artificial magnetic conductor array structure schematic diagram of shell based on artificial magnetic conductor with band-stop filtering function;
[0024] Figure 3 It is artificial magnetic conductor structure unit structure schematic diagram of shell based on artificial magnetic conductor with band-stop filtering function;
[0025] Figure 4 It is artificial magnetic conductor unit combination structure schematic diagram of shell based on artificial magnetic conductor with band-stop filtering function;
[0026] Figure 5 It is artificial magnetic conductor reflection coefficient phase angle curve of shell based on artificial magnetic conductor with band-stop filtering function;
[0027] Figure 6 A shell with band-stop filtering function based on artificial magnetic conductor, and a shell S21 parameter curve with band-stop filtering function based on artificial magnetic conductor;
[0028] Figure 7 A shell with band-stop filtering function based on artificial magnetic conductor, and an artificial magnetic conductor structure unit side surface size schematic diagram of the shell with band-stop filtering function based on artificial magnetic conductor;
[0029] Figure 8 A shell with band-stop filtering function based on artificial magnetic conductor, and an artificial magnetic conductor structure unit L-shaped top surface size labeling schematic diagram of the shell with band-stop filtering function based on artificial magnetic conductor. DETAILED DESCRIPTION
[0030] The preferred embodiments of the present application will be described in detail below with reference to the drawings, wherein the drawings constitute a part of this application and serve to explain the principles of the present application together with the embodiments of the present application, but are not intended to limit the scope of the present application.
[0031] One specific embodiment of the present application discloses a shell with band-stop filtering function based on artificial magnetic conductor, as shown in Figure 1 The shell is a cuboid structure, and the artificial magnetic conductor array is arranged on the inner surface of the top cover of the cuboid.
[0032] Specifically, the shell can be provided with a microwave circuit board, and the artificial magnetic conductor array can select the transmission wave band of the microstrip line on the microwave circuit board and effectively filter part of the high-order harmonic wave.
[0033] Each artificial magnetic conductor structure unit is obtained by the following steps: in a space rectangular coordinate system, on the z=0 plane, three straight lines of x=0, x=1.5 and y=0 and a straight line Surround a plane pattern, the plane pattern rotates 90° around the z-axis positive direction with the straight line y=0 as the axis to surround a solid pattern, the solid pattern surrounded in the space rectangular coordinate system is cut by y=0.6 and z=0.6 two planes to remove the first corner block of y>0.6 and the second corner block of z>0.6 to obtain a remaining solid pattern, the remaining solid pattern is cut by z=0.3 and y=0.3 two planes to remove the third corner block of z>0.3 and y>0.3 to form an opening, and an artificial magnetic conductor structure unit with an opening is obtained.
[0034] The structure schematic diagram of the artificial magnetic conductor structure unit is as shown in Figure 3 .
[0035] The side surface size schematic diagram of the artificial magnetic conductor structure unit is as shown in Figure 7 .
[0036] An L-shaped top surface of an artificial magnetic conductor structure unit is shown in Figure 8 .
[0037] Specifically, w=0.6mm, h=1.5mm, and s=0.3mm. The space volume occupied by each artificial magnetic conductor unit combination structure is 1.7mm*1.7mm*1.5mm.
[0038] An artificial magnetic conductor unit combination structure is shown in Figure 4 .
[0039] The top surface of the artificial magnetic conductor unit is L-shaped, the bottom surface is a sector with a central angle of 90°, and the notch surface is trapezoidal.
[0040] The notches of every four artificial magnetic conductor structure units form an artificial magnetic conductor unit combination, and the distance between the two adjacent artificial magnetic conductor structure units in each artificial magnetic conductor unit combination is 0.5mm.
[0041] Specifically, the four corners of the upper surface of each artificial magnetic conductor unit combination are in contact with the upper cover of the shell.
[0042] The outer surfaces of a plurality of identical artificial magnetic conductor unit combinations are abutted to form an artificial magnetic conductor array, and the sector-shaped bottom surface of each artificial magnetic conductor structure unit in the artificial magnetic conductor array is in contact with the upper cover of the shell.
[0043] The outer dimensions of the shell are 22mm*22mm*5.75mm.
[0044] The thickness of the top cover and the bottom cover of the shell is 0.5mm, and the thickness of the side wall of the shell is 3.65mm.
[0045] The materials of the shell and the artificial magnetic conductor array are both copper.
[0046] Specifically, the use of copper as the material of the shell produces better shielding effect than other metals.
[0047] The stopband filtering frequency band range of the shell is 31GHz-35GHz, and the center frequency is 33GHz.
[0048] Specifically, the use of a distance of 0.5mm produces a stopband filtering effect with a stopband frequency band of 31GHz-35GHz and a center frequency of 33GHz.
[0049] A stopband filtering effect S21 parameter curve is shown in Figure 6 .
[0050] The artificial magnetic conductor array covers the inner surface of the top cover of the shell.
[0051] An artificial magnetic conductor array structure is shown in Figure 2 .
[0052] The phase angle curve of the reflection coefficient of the artificial magnetic conductor array structure is simulated as shown in the figure Figure 5 Figure 5 It reflects that the artificial magnetic conductor array structure has a 0° reflection phase at a frequency of about 33GHz.
[0053] The artificial magnetic conductor array is formed by 3D printing of copper powder, and the artificial magnetic conductor array and the top cover of the shell are integrated.
[0054] The distance between the lower surface of the artificial magnetic conductor array and the upper surface of the microwave circuit board is 1.0mm.
[0055] The device further comprises a connector, which includes a signal input end connector and a signal output end connector; the shell has through holes on the left and right sides, and the signal input end connector and the signal output end connector are arranged in the left and right through holes of the shell respectively.
[0056] One application scenario of the shell is to place a microwave circuit board in the shell, and the shell can have a band-stop filtering effect on the circuit board with a center frequency of 33GHz.
[0057] When the microwave circuit board is placed in the shell, the signal input end connector is connected to the input end of the microstrip line on the microwave circuit board, and the signal output end connector is electrically connected to the output end of the microstrip line on the microwave circuit board.
[0058] The connector is an SMP RF coaxial connector.
[0059] Specifically, the external RF signal is connected to the input end of the SMP RF coaxial connector through the RF coaxial cable, connected to the output end of the SMP RF coaxial connector after passing through the microstrip line, and the RF signal filtered by the band-stop filter device is obtained.
[0060] In the application scenario in actual engineering, the microwave circuit board is adhered to the bottom of the shell using conductive adhesive, the size of the microwave circuit board is 15mm*15mm*1.5mm, the substrate material of the microwave circuit board is FR4, and the upper and lower layers of the substrate are metal layers, the upper layer is provided with a microstrip line, and the lower layer is a metal ground layer. The SMP connector is welded at the port position on both sides of the microstrip line as the input and output interface of the microwave circuit board, and the band-stop filtering effect with a center frequency of 33GHz can be achieved.
[0061] The top layer and the bottom layer of the microwave circuit board are metal layers, and the bottom metal layer is grounded; the microwave circuit board is adhered to the bottom of the shell using conductive adhesive.
[0062] Compared with the prior art, the rectangular top cover inner surface of the shell with band-stop filtering function based on artificial magnetic conductor provided by the embodiment is provided with an artificial magnetic conductor array, the artificial magnetic conductor array is formed by arranging a plurality of same artificial magnetic conductor structure units, in a space rectangular coordinate system, on the z=0 plane, a plane pattern is surrounded by three straight lines of x=0, x=1.5 and y=0, the plane pattern is rotated by 90° around the z axis positive direction to form a solid pattern, the solid pattern surrounded is cut by two planes of y=0.6 and z=0.6 to remove a first corner block of y>0.6 and a second corner block of z>0.6 to obtain a remaining solid pattern, the remaining solid pattern is cut by two planes of z=0.3 and y=0.3 to remove a third corner block of z>0.3 and y>0.3 to form an aperture, and an artificial magnetic conductor structure unit with the aperture is obtained. The artificial magnetic conductor array is used in the design of a circuit board shell, the band-stop filtering frequency band range is 31GHz-35GHz, and the center frequency is 33GHz.
[0063] The above is only a preferred specific embodiment of the present application, but the protection scope of the present application is not limited to this, any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.
Claims
1. An artificial magnetic conductor-based case having a band rejection filter function, characterized by, The shell appearance is a cuboid structure, the cuboid top cover inner surface is provided with an artificial magnetic conductor array, the artificial magnetic conductor array is formed by arranging a plurality of same artificial magnetic conductor structure units.
2. The case with a band elimination filter function according to claim 1, characterized by, The shape of each artificial magnetic conductor structure unit is: In the z=0 plane of the space rectangular coordinate system, a plane figure is enclosed by the three straight lines of x=0, x=1.5, y=0 and the straight line The straight line y=0 is taken as the axis, and the plane figure is rotated by 90° in the positive direction of the z axis to form a solid figure. The enclosed solid figure is cut by y=0.6 and z=0.6 planes to remove the first corner block of y>0.6 and the second corner block of z>0.6 to obtain a remaining solid figure; The remaining solid figure is cut by z=0.3 and y=0.3 planes to remove the third corner block of z>0.3 and y>0.3 to form an aperture; The remaining solid figure with the aperture is the artificial magnetic conductor structure unit.
3. The case with a band elimination filter function according to claim 2, characterized by, The top surface of the artificial magnetic conductor structure unit is L-shaped, the bottom surface is a sector with a central angle of 90°, and the aperture surface is trapezoidal.
4. The shell with the band-stop filtering function according to claim 3, characterized in that, The apertures of every four artificial magnetic conductor structure units oppositely form an artificial magnetic conductor unit combination, and the distance between the upper and lower and the left and right adjacent artificial magnetic conductor structure units in each artificial magnetic conductor unit combination is 0.5 mm.
5. The case with a band elimination filter function according to claim 4, characterized by, The outer surfaces of a plurality of same artificial magnetic conductor unit combinations are abutted to form an artificial magnetic conductor array, and the sector bottom surface of each artificial magnetic conductor structure unit in the artificial magnetic conductor array is in contact with the shell top cover.
6. The case with a band elimination filter function according to claim 1, characterized by, The outer dimension of the shell is 22 mm x 22 mm x 5.75 mm.
7. The case with a band elimination filter function according to claim 6, characterized by, The thickness of the top cover and the bottom cover of the shell is 0.5 mm, and the thickness of the shell side wall is 3.65 mm.
8. The band-stop filter-featured case according to any one of claims 1-7, wherein, The material of the shell and the artificial magnetic conductor array is copper.
9. The case with a band elimination filter function according to claim 1, characterized by, The band-stop filtering frequency band range of the shell is 31 GHz-35 GHz, and the center frequency is 33 GHz.
10. The case with a band elimination filter function according to claim 5, characterized by, The artificial magnetic conductor array covers the inner surface of the shell top cover.