Shielding structure for transmission line

Abstract

The embodiment of the invention provides a shielding structure for a transmission line, and relates to the technical field of transmission line shielding. The shielding structure for the transmission line comprises a non-metal shielding strip, a first reference plane and a first signal transmission line, and the first reference plane is a grounding layer made of a metal material; the first signal transmission line and the first reference plane are arranged at a preset interval. And the non-metal shielding strip is made of engineering plastic with a loss angle tangent value, and is attached to the surface of the radiation coupling area of the reference surface 1. The non-metal shielding strip made of the non-metal material with the loss angle characteristic is arranged on the reference surface, so that the non-metal shielding strip is easy to form, low in cost, small in occupied space and capable of effectively absorbing high-frequency signal crosstalk; the problems that an existing metal shielding technology is difficult to process, high in cost and many in use limitation, and impedance and loss are affected when crosstalk is optimized are solved.

Description

Technical Field

[0001] The present application relates to the technical field of transmission line shielding, and in particular to a shielding structure for a transmission line. Background Art

[0002] With the rapid development of high-speed signal transmission technology, crosstalk has become one of the key factors affecting signal integrity and system performance. To suppress crosstalk, existing technologies mainly use the following three methods:

[0003] Increasing the return path: By optimizing the design of the signal reference plane (such as the ground layer), the continuity of the return path is enhanced, thereby reducing coupling interference between signals. However, this method is less applicable to complex circuit layouts and has limited effectiveness at high frequencies.

[0004] Metal shielding: This is the most commonly used method for crosstalk suppression. By adding a metal shielding structure around the signal transmission line, the propagation of electromagnetic radiation and coupled energy is blocked. However, metal shielding has obvious drawbacks:

[0005] Difficulty in processing: Metal shielding structures require precision processing, especially for complex structures, which significantly increases the difficulty of manufacturing;

[0006] High cost: Metal materials themselves are expensive, and complex processing techniques (such as laser welding, surface treatment, etc.) further increase production costs;

[0007] Many restrictions on use: Metal shielding requires a lot of space and is difficult to be widely used in miniaturized, high-density integrated electronic devices;

[0008] Limited effectiveness: Although metal shielding can effectively block electromagnetic radiation, incomplete shielding may still occur in certain frequency bands, especially in high-frequency signal transmission scenarios.

[0009] Increasing signal spacing: This approach reduces coupling effects and thus crosstalk by increasing the distance between signal transmission lines. However, this approach takes up connection space, which is contrary to the trend of miniaturization and thinness in modern electronic products, and is difficult to implement in high-density wiring environments.

[0010] Furthermore, existing technologies face a common problem when optimizing crosstalk: while improving crosstalk, other performance indicators often deteriorate. For example, adding metal shielding or adjusting signal spacing can change the characteristic impedance of the transmission line, leading to increased signal reflections and insertion loss, which in turn affects overall system performance.

[0011] In summary, existing crosstalk control technologies have obvious shortcomings in terms of processing difficulty, cost control, flexibility of use, and comprehensive performance optimization. New solutions are urgently needed that can effectively suppress crosstalk while taking into account process simplicity, cost-effectiveness, and high-frequency adaptability. Summary of the Invention

[0012] This application aims to solve at least one of the technical problems existing in the prior art. To this end, this application proposes a shielding structure for a transmission line. By disposing a non-metallic shielding strip made of a non-metallic material with loss angle characteristics on a reference plane, the application utilizes the easy molding, low cost, small space occupation, and effective absorption of high-frequency signal crosstalk characteristics of the non-metallic shielding strip. This solves the problems of existing metal shielding technology such as difficult processing, high cost, many usage restrictions, and the impact on impedance and loss when optimizing crosstalk.

[0013] This application is implemented as follows:

[0014] The present application provides a shielding structure for a transmission line, comprising:

[0015] Reference plane 1 is a metal grounding layer;

[0016] The first signal transmission line is arranged to maintain a preset distance from the first reference surface;

[0017] A non-metallic shielding strip is made of an engineering plastic with a loss tangent value and is adhered to the surface of the radiation coupling area of the reference plane 1; wherein, the non-metallic shielding strip absorbs the radiation energy of the signal transmission line 1 and the coupling energy of the reference plane 1 through the dielectric loss characteristics of the material to achieve crosstalk suppression.

[0018] According to the shielding structure for a transmission line in an embodiment of the present application, the engineering plastic includes materials such as polyetheretherketone, liquid crystal polymer, and polyamide.

[0019] According to the shielding structure for a transmission line according to an embodiment of the present application, the non-metallic shielding strip is arranged along a length direction of the reference plane.

[0020] According to the shielding structure for a transmission line in an embodiment of the present application, the operating frequency band of the non-metallic shielding strip covers 0-100 GHz, and the crosstalk suppression in the 10-40 GHz frequency band is ≥15 dB.

[0021] Beneficial effects of the present invention:

[0022] This solution adds a non-metallic shielding strip made of a non-metallic material with loss angle characteristics to the signal reference plane, which can effectively consume part of the energy radiated by the signal transmission line and absorb the energy coupled on the reference plane, thereby significantly reducing crosstalk. At the same time, it solves the problems of existing metal shielding technology such as difficult processing, high cost, many usage restrictions, and the impact on impedance and loss when optimizing crosstalk. In addition, due to the easy molding characteristics of plastic materials, the non-metallic shielding strip can better fit the shape of the reference plane, which not only simplifies the process flow but also greatly reduces production costs. In addition, the structure requires little space and has a wide range of applications. It shows a significant crosstalk reduction effect in the 0-100GHz frequency band, providing a better solution for high-frequency signal transmission. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments of the present application. It should be understood that the following drawings only illustrate certain embodiments of the present application and should not be considered as limiting the scope. For those skilled in the art, other relevant drawings can be obtained based on these drawings without creative work. Shielding structure for transmission line

[0024] Figure 1 This is a first perspective schematic diagram of a non-metallic shielding structure according to an embodiment of the present application;

[0025] Figure 2 This is a second three-dimensional schematic diagram of a non-metallic shielding structure according to an embodiment of the present application;

[0026] Figure 3 is a bottom-up perspective schematic diagram of a non-metallic shielding structure according to an embodiment of the present application;

[0027] Figure 4 is a three-dimensional schematic diagram of an unused non-metallic shielding strip according to an embodiment of the present application;

[0028] Figure 5 is a three-dimensional schematic diagram of a metal shielding layer according to an embodiment of the present application;

[0029] Figure 6 This is a comparison curve of the anti-crosstalk effects of using and not using non-metallic shielding strips according to an embodiment of the present application.

[0030] In the figure: 1. Non-metallic shielding strip; 2. Reference surface one; 3. Signal transmission line one; 4. Metal shielding layer; 5. Reference surface two; 6. Signal transmission line two. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application.

[0032] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0033] Example 1

[0034] like Figure 4 and Figure 5 As shown, in the prior art, the reference plane 2 5 and the signal transmission line 2 6 suppress crosstalk through the metal shielding layer 4. However, the metal shielding has problems such as difficult processing, high cost, many usage restrictions, limited effect, and widening the signal spacing. Therefore, it is necessary to improve the crosstalk.

[0035] like Figure 1-Figure 3 As shown, according to an embodiment of the present application, a shielding structure for a transmission line includes a reference plane 2, a signal transmission line 3, and a non-metallic shielding strip 1, wherein the reference plane 2 is a grounding layer made of a metal material; the signal transmission line 3 and the reference plane 2 are arranged to maintain a preset distance; the non-metallic shielding strip 1 is made of an engineering plastic with a loss tangent value, and is adhered to the surface of the radiation coupling area of the reference plane 2; wherein the non-metallic shielding strip 1 absorbs the radiation energy of the signal transmission line 3 and the coupling energy of the reference plane 2 through the dielectric loss characteristics of the material, thereby achieving crosstalk suppression;

[0036] Wherein, the non-metallic shielding strip 1 is arranged along the length direction of the reference plane 2;

[0037] Specifically, engineering plastics include but are not limited to polyetheretherketone (PEEK), liquid crystal polymer (LCP), and polyamide (PA) materials. In actual use, users can select them according to actual needs.

[0038] Specifically, the operating frequency band of the non-metallic shielding strip 1 covers 0-100 GHz, and the crosstalk suppression in the 10-40 GHz frequency band is ≥15 dB.

[0039] The signal transmission line 1 3 is a differential line pair or a single-ended transmission line.

[0040] like Figure 6 As shown, design A does not use the non-metallic shielding strip 1, and design B uses the non-metallic shielding strip 1. Compared with design A, the use of the non-metallic shielding strip 1 in design B significantly reduces crosstalk in the 0-100 GHz range.

[0041] Specifically, the working principle of the shielding structure for transmission lines is as follows: This solution can effectively consume part of the energy radiated by the signal transmission line and absorb the energy coupled on the reference plane by adding a non-metallic shielding strip made of a non-metallic material with loss angle characteristics on the signal reference plane, thereby significantly reducing crosstalk. At the same time, it solves the problems of existing metal shielding technology such as difficult processing, high cost, many usage restrictions, and the impact on impedance and loss when optimizing crosstalk; in addition, due to the easy molding characteristics of plastic materials, the non-metallic shielding strip can better fit the shape of the reference plane, which not only simplifies the process flow, but also greatly reduces production costs. In addition, the structure requires little space and has a wide range of applications. It shows a significant crosstalk reduction effect in the 0-100GHz frequency band, providing a better solution for high-frequency signal transmission.

[0042] Example 2

[0043] A method for manufacturing a shielding structure comprises the following steps:

[0044] S1. Non-metallic shielding strip 1 is prepared by injection molding process;

[0045] S2 by hot pressing composite process to combine the non-metallic shielding strip 1 with the metal reference surface 2;

[0046] S3. Control the interface gap to be no greater than 0.1 mm.

[0047] The foregoing is merely an embodiment of the present application and is not intended to limit the scope of protection of the present application. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included within the scope of protection of the present application. It should be noted that similar reference numerals and letters represent similar items in the following figures. Therefore, once an item is defined in one figure, it does not need to be further defined or explained in subsequent figures.

[0048] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A shielding structure for a transmission line, characterized in that include: Reference plane 1 (2) is a grounding layer made of metal; A signal transmission line (3) is arranged to maintain a preset distance from the reference surface (2); A non-metallic shielding strip (1) is made of an engineering plastic with a loss tangent value, and is provided with a fitting gap of 0-0.1 mm on the surface of the radiation coupling region of the reference plane (2); wherein the non-metallic shielding strip (1) absorbs the radiation energy of the signal transmission line (3) and the coupling energy of the reference plane (2) through the dielectric loss characteristics of the material, thereby achieving crosstalk suppression.

2. The shielding structure for a transmission line according to claim 1, wherein: The engineering plastics include polyetheretherketone (PEEK), liquid crystal polymer (LCP), polyamide (PA) and other materials.

3. The shielding structure for a transmission line according to claim 1, wherein: The non-metallic shielding strip (1) is arranged along the length direction of the reference surface (2).

4. The shielding structure for a transmission line according to claim 1, wherein: The operating frequency band of the non-metallic shielding strip (1) covers 0-100 GHz, and the crosstalk suppression amount in the 10-40 GHz frequency band is ≥15 dB.

Images