A stripline for electromagnetic compatibility immunity and emission tests

Abstract

This invention discloses a stripline for electromagnetic compatibility (EMC) immunity and emission testing, comprising an aluminum lower plate and an aluminum upper plate positioned above the top of the lower plate. The upper plate consists of an aluminum conductive triangular plate and an aluminum conductive flat plate, with the tip of the triangular plate fixedly connected to an N-type connector on the lower plate. A conductive connecting aluminum plate is positioned on the lower plate, and a BNC female connector is positioned on the conductive connecting aluminum plate. The core of the BNC female connector is connected to the lower end of a T-shaped copper strip. A screw is positioned on the conductive connecting aluminum plate, and a resistive load is positioned between the screw and the BNC female connector. One end of the resistive load is connected to the screw, and the other end is connected to the lower end of the T-shaped copper strip. This stripline for EMC immunity and emission testing has a simple structure, and the stripline structure is completely enclosed in a dielectric medium with the electromagnetic field, resulting in extremely low radiation loss. It is suitable for high-speed digital circuits and high-isolation RF systems, is less affected by temperature, humidity, and external interference, and exhibits good repeatability.

Description

Technical Field

[0001] This invention relates to striplines, and more particularly to a stripline for electromagnetic compatibility immunity and emission testing. Background Technology

[0002] In automotive electronic and electrical component electromagnetic compatibility immunity and radiated emission testing, striplines are commonly used as test coupling devices. Existing striplines consist of two parallel grounded metal plates on the top and bottom, with a rectangular conductor strip of width ω and thickness t in the middle. The space between the ground plates is filled with a uniform dielectric or air; this is also known as a three-plate strip. Striplines offer advantages such as small size, light weight, wide operating bandwidth, high quality factor (Q), easy processing and molding, and low manufacturing cost, making them suitable for manufacturing high-performance passive components.

[0003] Conventional striplines with double-grounded shielding and symmetrical structure can precisely control characteristic impedance and have excellent inherent shielding effectiveness; however, the signal speed is slower, and the three-layer structure of the stripline increases the complexity of the manufacturing process, making it unsuitable for miniaturization in the ultra-high frequency band. In addition, the existing stripline structure and electromagnetic field cannot be completely enclosed in the medium, resulting in high leakage of electromagnetic waves at the edges, high radiation loss, and electrical performance that is easily affected by ambient temperature and humidity and external electromagnetic interference. The consistency and stability are poor when repeated tests are conducted, and the accuracy of test data reproduction is insufficient. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a stripline for electromagnetic compatibility immunity and emission testing with extremely low radiation loss.

[0005] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution:

[0006] A stripline for electromagnetic compatibility immunity and emission testing includes a substrate made of insulating material and a lower aluminum plate attached to the top surface of the substrate. An upper aluminum plate is positioned above the lower aluminum plate. The upper aluminum plate consists of an aluminum conductive triangular plate and an aluminum conductive flat plate connected front to back. The aluminum conductive triangular plate has a triangular structure with a pointed front end, which is fixedly connected to a conductor on an N-type head fixed to the lower aluminum plate. The aluminum conductive flat plate is parallel to the lower aluminum plate vertically, and a T-shaped copper sheet is fixedly connected to its rear center. A conductive connecting aluminum plate is fixedly connected to the lower aluminum plate at a position below the rear of the aluminum conductive flat plate. A BNC female connector is fixedly connected to the conductive connecting aluminum plate, and the core rod at the center of the BNC female connector is connected to the lower end of the T-shaped copper sheet. A screw is fixedly connected to the BNC female connector on one side of the conductive connecting aluminum plate. A resistive load is positioned between the screw and the BNC female connector, with one end connected to the screw and the other end connected to the lower end of the T-shaped copper sheet.

[0007] Furthermore, a cavity with vertical connection is provided at the bottom of the substrate near the front end, and a transition hole with vertical connection is provided at the corresponding center of the cavity on the lower aluminum plate; the N-type head is disposed in the cavity, and its top is fixedly connected to the bottom of the corresponding lower aluminum plate; the conductor on the N-type head passes vertically upward through the transition hole and is fixedly connected to the aluminum conductive triangle plate located above the top of the lower aluminum plate.

[0008] Furthermore, the aluminum conductive triangle plate has a connecting hole that is connected vertically near the front end. The aluminum conductive triangle plate is fitted onto the outside of the conductor through the connecting hole. Fastening screws that are threadedly connected to the conductor are provided at the upper and lower ends of the aluminum conductive triangle plate on the outside of the conductor.

[0009] Furthermore, an insulating connecting piece is provided at the rear end of the aluminum conductive plate on the side of the T-shaped copper sheet, which is fixedly connected to the conductive connecting aluminum plate.

[0010] Furthermore, the insulating connecting piece has two pieces, which are symmetrically arranged on both sides of the T-shaped copper sheet.

[0011] Furthermore, the aluminum conductive plate and the aluminum conductive triangular plate are fixedly connected together by an aluminum plate connecting plate.

[0012] Furthermore, the aluminum conductive plate and the aluminum conductive triangular plate are fixed to the upper aluminum plate by insulating support columns.

[0013] Compared with the prior art, the advantages of this invention are: the stripline structure for electromagnetic compatibility immunity and emission testing is simple, the stripline structure and the electromagnetic field are completely enclosed in the medium, the radiation loss is extremely low, it is suitable for high-speed digital circuits and high isolation radio frequency systems, it is less affected by temperature, humidity and external interference, and has good repeatability. Attached Figure Description

[0014] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of a stripline axial structure for electromagnetic compatibility immunity and emission testing according to the present invention;

[0016] Figure 2 yes Figure 1 Enlarged view of the structure of A in the middle;

[0017] Figure 3This is a top view schematic diagram of a stripline structure for electromagnetic compatibility immunity and emission testing according to the present invention;

[0018] Figure 4 is Figure 3 Structural sectional view of BB;

[0019] Figure 5 This is an enlarged view of the structure of C in Figure 4;

[0020] Figure 6 This is a schematic diagram of the front end structure of a stripline for electromagnetic compatibility immunity and emission testing according to the present invention;

[0021] Figure 7 This is a schematic diagram of the connection structure between the T-shaped copper sheet, BNC female connector, resistive load, and screw in a stripline for electromagnetic compatibility immunity and emission testing according to the present invention.

[0022] Figure 8 This is a schematic diagram of the N-type head structure in a stripline for electromagnetic compatibility immunity and emission testing according to the present invention.

[0023] In the diagram: 1. Lower aluminum plate; 11. Base plate; 111. Cavity; 12. Transition hole; 2. Upper aluminum plate; 21. Conductive aluminum plate; 22. Conductive aluminum triangle; 221. Connecting hole; 23. Aluminum plate connector; 3. Insulating support column; 4. Conductive connecting aluminum plate; 5. Insulating connecting piece; 6. T-shaped copper sheet; 61. BNC female connector; 62. Resistive load; 63. Screw; 7. N-type head; 71. Conductor; 72. Fastening screw. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0025] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. In the description of the embodiments of the invention, it should be noted that if terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" indicate orientation or positional relationships based on the orientation or positional relationships shown in the drawings, or the orientation or positional relationships commonly used when the product is in use, they are only for the convenience of describing the invention 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, and therefore should not be construed as a limitation of the invention. Furthermore, terms such as "first" and "second" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0026] Furthermore, the use of terms such as "horizontal" or "vertical" does not imply that the component must be absolutely horizontal or vertical, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure or component must be completely horizontal, but can be slightly tilted.

[0027] In the description of the embodiments of the present invention, "multiple" means at least two.

[0028] In the description of the embodiments of the present invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" 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 mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific circumstances.

[0029] Example

[0030] Please refer to the instruction manual attached. Figure 1 and 3 As shown, the instruction manual is attached. Figure 1 and 3The illustration shows a specific embodiment of a stripline for electromagnetic compatibility (EMC) immunity and emission testing according to the present invention. This stripline is suitable for EMC immunity and emission testing of automotive electronic and electrical components. It includes a substrate 11 made of insulating material and a lower aluminum plate 1 attached to the top surface of the substrate 1, forming a large-area, complete metal grounding plane. In this embodiment, the substrate 11 is made of wood. An upper aluminum plate 2 is disposed above the top of the lower aluminum plate 1. The stripline formed by the upper and lower aluminum plates 2 is an open waveguide. The upper aluminum plate 2 is composed of an aluminum conductive triangular plate 22 and an aluminum conductive flat plate 21 connected front to back. See the appendix of the specification. Figure 3 As shown, the aluminum conductive plate 21 and the aluminum conductive triangle plate 22 are fixedly connected together by an aluminum plate connecting plate 221. The aluminum plate connecting plate 221 overlaps the top surface of the mating portion of the corresponding aluminum conductive triangle plate 22 and aluminum conductive plate 21, and are fixed together by screws, making assembly and disassembly convenient. To facilitate the installation of the aluminum conductive plate 21 and aluminum conductive triangle plate 22 on the lower aluminum plate 1, as shown in Figure 4 of the specification, the aluminum conductive plate 21 and aluminum conductive triangle plate 22 are fixed to the upper aluminum plate 2 by insulating support columns 3. It should be noted that the insulating support columns 3 are fixedly connected to both the aluminum conductive plate 21 and aluminum conductive triangle plate 22 by screws, and the insulating support columns 3 are fixed to the lower aluminum plate 1 by screws. It should be noted that the characteristic impedance of the stripline is changed by altering the ratio of the width of the main conductor (i.e., the width of the upper aluminum plate 2 in this invention) to the height of the insulating support column 3. (See Figure 4 of the specification.) Figure 3 As shown, the aluminum conductive triangular plate 22 has a triangular structure, specifically an isosceles triangle structure, with a pointed front end. This pointed end is fixedly connected to the conductor 71 on the N-type head 7 fixed on the lower aluminum plate 1. The structure of the N-type head 7 is as shown in the attached instruction manual. Figure 8 As shown, conductor 71 is located at the center of N-type head 7, and its exterior has a fastening screw 72 that engages with its thread. To facilitate the installation of N-type head 7, in this embodiment, a cavity 111 with vertical communication is provided at the bottom of the substrate 11 near the front end, and a transition hole 12 with vertical communication is provided on the lower aluminum plate 1 at the center of the cavity 111. N-type head 7 is vertically positioned within the cavity 111, and its top is fixedly connected to the bottom of the corresponding lower aluminum plate 1. Specifically, the top of the N-type head is fixedly connected to the bottom of the lower aluminum plate 1 at the corresponding cavity 111 by screws, facilitating easy assembly and disassembly. The conductor 71 on N-type head 7 is vertically upward and passes through the transition hole 12, and is fixedly connected to the aluminum conductive triangle 22 located above the top of the lower aluminum plate 1. (See attached instruction manual for details.) Figure 5 and 6As shown, in order to facilitate the connection between the aluminum conductive triangle plate 22 and the conductor 71 on the N-type head 7, a connecting hole 221 with vertical connection is provided on the aluminum conductive triangle plate 22 near the front end. The connecting hole 221 corresponds vertically to the transition hole 12. The aluminum conductive triangle plate 22 is sleeved on the outside of the conductor 71 through the connecting hole 221. Fastening screws 72 with threads are provided on the outside of the conductor 71 between the upper and lower ends of the aluminum conductive triangle plate 22. The front end of the aluminum conductive triangle plate 22 is fixedly connected to the conductor 71 of the N-type head 7 by the fastening screws 72.

[0031] See the attached instruction manual. Figure 1 As shown in Figure 4, the aluminum conductive plate 21 is parallel to the lower aluminum plate 1 vertically. A T-shaped copper sheet 6 is fixedly connected to the center of the rear end of the aluminum conductive plate 21. In this embodiment, the T-shaped copper sheet 6 is fixedly connected to the center of the rear end of the aluminum conductive plate 21 by screws. It should be noted that, in order to facilitate the connection of the T-shaped copper sheet 6, the rear end of the aluminum conductive plate 21 has a downward right-angle bend, and the T-shaped copper sheet 6 is fixedly connected to the bend by screws. For convenient signal transmission, please refer to the appendix of the specification. Figure 2 As shown, a conductive connecting aluminum plate 4 is fixedly connected to the lower aluminum plate 1 at a position below the rear end of the aluminum conductive plate 21. The conductive connecting aluminum plate 4 is fixedly connected to the lower aluminum plate 1 by screws. (See the attached instruction manual.) Figure 7 As shown, a BNC female connector 61 is fixedly connected to the conductive connecting aluminum plate 4. The core rod at the center of the BNC female connector 61 is connected to the lower end of the T-shaped copper sheet 6. A screw 63 is fixedly connected to one side of the BNC female connector 61 on the conductive connecting aluminum plate 4. A resistive load 62 is provided between the screw 63 and the BNC female connector 61. The resistive load 62 has a standard characteristic impedance of 50Ω or 90Ω. One end of the load is connected to the screw 63, and the other end is connected to the lower end of the T-shaped copper sheet 6.

[0032] For convenient connection and support between the aluminum conductive plate 21 and the conductive connecting aluminum plate 4, please refer to the appendix of the instruction manual. Figure 1 and 2 As shown, an insulating connecting piece 5 is provided at the rear end of the aluminum conductive plate 21 on the side of the T-shaped copper sheet 6, and is fixedly connected to the conductive connecting aluminum plate 4. The insulating connecting piece 5 is fixedly connected to the bent part at the rear end of the aluminum conductive plate 21 and the conductive connecting aluminum plate 4 by screws. The insulating connecting piece 5 serves to connect and support the rear end of the aluminum conductive plate 21 and the conductive connecting aluminum plate 4. In this embodiment, there are two insulating connecting pieces 5, which are symmetrically arranged on both sides of the T-shaped copper sheet 6. The two insulating connecting pieces 5 provide good support for the rear end of the aluminum conductive plate 21, ensuring the balance of the rear end of the aluminum conductive plate 21.

[0033] The characteristic impedance of the strip is typically 50Ω (ratio of 5) and 90Ω (ratio of 1.83). At the end of the strip in this invention, a resistive load with the same impedance is connected according to its characteristic impedance. During testing, the entire area is filled with a single dielectric, which can be air or an electrical dielectric. The 50Ω / 90Ω standard characteristic impedance is precisely set by adjusting the width 21 of the aluminum conductive plate and the height of the insulating support column 3. The input end relies on the aluminum conductive triangle plate 22, the T-shaped copper sheet 6, and the N-type connector 7 to complete the impedance matching transition from coaxial to planar transmission line. The aluminum conductive triangle plate 22... The aluminum conductive plate 21 and the T-shaped copper sheet 6 constitute the upper main body. During testing, the radio frequency signal is input from the N-type connector 7, fed through the aluminum conductive triangle 22, the aluminum conductive plate 21 and the T-shaped copper sheet 6 to the conductive connecting aluminum plate 4, and finally received through the BNC female connector. The electromagnetic field is completely confined within the insulating dielectric layer between the upper main conductor and the metal ground plane, resulting in extremely low radiation loss. The end of the stripline is connected to a resistive load 62 that matches the characteristic impedance, forming a complete signal loop. This allows for radio frequency radiation and EMC testing of vehicle wiring harnesses and electronic components. The enclosed structure minimizes electromagnetic field leakage and ensures a stable testing environment.

[0034] This stripline structure for electromagnetic compatibility immunity and emission testing is simple. The stripline structure and electromagnetic field are completely enclosed in the medium, resulting in extremely low radiation loss. It is suitable for high-speed digital circuits and high-isolation RF systems. It is less affected by temperature, humidity, and external interference, and has good repeatability.

[0035] It should be emphasized that the above are merely preferred embodiments of the present invention and are not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A stripline for electromagnetic compatibility immunity and emission testing, characterized in that: The system includes a substrate (11) made of insulating material and an aluminum lower plate (1) attached to the top surface of the substrate (1). An aluminum upper plate (2) is provided above the top of the aluminum lower plate (1). The aluminum upper plate (2) is composed of an aluminum conductive triangular plate (22) and an aluminum conductive plate (21) connected front to back. The aluminum conductive triangular plate (22) has a triangular structure with a pointed front end, which is fixedly connected to a conductor (71) fixed on an N-type head (7) on the aluminum lower plate (1). The aluminum conductive plate (21) is parallel to the aluminum lower plate (1) vertically. A T-shaped copper sheet (6) is fixedly connected to the center of the rear end of the aluminum conductive plate (21). The aluminum lower plate (1) is located above the aluminum upper plate (1). A conductive connecting aluminum plate (4) is provided at the lower part of the rear end of the aluminum conductive plate (21) and is fixedly connected thereto. A BNC female head (61) is provided on the conductive connecting aluminum plate (4) and is fixedly connected thereto. The core rod in the center of the BNC female head (61) is connected to the lower end of the T-shaped copper sheet (6). A screw (63) is provided on the conductive connecting aluminum plate (4) on one side of the BNC female head (61) and is fixedly connected thereto. A resistive load (62) is provided between the screw (63) and the BNC female head (61). One end of the resistive load (62) is connected to the screw (63) and the other end is connected to the lower end of the T-shaped copper sheet (6).

2. The stripline for electromagnetic compatibility immunity and emission testing according to claim 1, characterized in that: The bottom of the substrate (11) near the front end is provided with a cavity (111) that is connected vertically. The aluminum lower plate (1) is provided with a transition hole (12) that is connected vertically at the center of the cavity (111). The N-type head (7) is disposed in the cavity (111), and its top is fixedly connected to the bottom of the corresponding aluminum lower plate (1). The conductor (71) on the N-type head (7) passes vertically upward through the transition hole (12) and is fixedly connected to the aluminum conductive triangle plate (22) located above the top of the aluminum lower plate (1).

3. The stripline for electromagnetic compatibility immunity and emission testing according to claim 2, characterized in that: The aluminum conductive triangle plate (22) has a connecting hole (221) that is connected vertically near the front end. The aluminum conductive triangle plate (22) is sleeved on the outside of the conductor (71) through the connecting hole (221). The conductor (71) is provided with a fastening screw (72) that is threadedly connected to the upper and lower ends of the aluminum conductive triangle plate (22).

4. The stripline for electromagnetic compatibility immunity and emission testing according to claim 1, characterized in that: An insulating connecting piece (5) is provided at the rear end of the aluminum conductive plate (21) on the side of the T-shaped copper sheet (6) and is fixedly connected to the conductive connecting aluminum plate (4).

5. The stripline for electromagnetic compatibility immunity and emission testing according to claim 4, characterized in that: The insulating connecting piece (5) has two pieces, and the two insulating connecting pieces (5) are symmetrically arranged on both sides of the T-shaped copper sheet (6).

6. The stripline for electromagnetic compatibility immunity and emission testing according to claim 1, characterized in that: The aluminum conductive plate (21) and the aluminum conductive triangle plate (22) are fixedly connected together by an aluminum plate connecting plate (221).

7. The stripline for electromagnetic compatibility immunity and emission testing according to claim 1, characterized in that: The aluminum conductive plate (21) and the aluminum conductive triangle plate (22) are fixed on the aluminum upper plate (2) by insulating support columns (3).

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