Signal line structure

Abstract

A signal line structure (1) is provided. The signal line structure (1) includes a first earth ground plane, formed on a first layer; a first system ground plane, formed on the first layer (10), wherein the first earth ground plane and the first system ground plane (102) are separated by a first gap (GAP1); a signal line (103), formed on the first layer (10), wherein the first earth ground plane is formed around an input side of the signal line (103) and the first system ground plane (102) is formed around an output side of the signal line (103); a second earth ground plane (201), formed on a second layer (20); a second system ground plane (202), formed on the second layer (20), wherein the second earth ground plane (201) and the second system ground plane (202) are separated by a second gap (GAP2).

Description

Field of the Invention

[0001] The present invention relates to a signal line structure, and more particularly, to a signal line structure having an earth ground plane and a system ground plane separated by a gap.Background of the Invention

[0002] In radio frequency (RF) transmission, it is a common practice to surround or shield signal lines or signal paths with a ground plane. The ground plane is typically divided into a system ground and an earth ground, separated by a gap filled with a dielectric material or left air-filled to mitigate the influence of noise from the ground plane on the electrical system. However, parasitic capacitance may be formed across the gap, and the current passes through the discontinuous ground plane (the system ground and the earth ground), causing radiation and antenna effect between the system ground and the earth ground, and increasing the risk of degradation of sensitivity (Desense) of the electrical system.

[0003] Under this circumstance, how to design the ground plane of the signal line structure to suppress the noise, radiation and antenna effect has become one of the goals in the industry.Summary of the Invention

[0004] Therefore, the purpose of the present invention is to provide a signal line structure to improve the drawback of the prior art.

[0005] This is achieved by a signal line structure according to claim 1. The dependent claims pertain to corresponding further developments and improvements.

[0006] As will be seen more clearly from the detailed description following below, a signal line structure is disclosed herein. The signal line structure includes a first earth ground plane, formed on a first layer; a first system ground plane, formed on the first layer, wherein the first earth ground plane and the first system ground plane are separated by a first gap; a signal line, formed on the first layer, utilized for signal transmission, wherein the first earth ground plane is formed around an input side of the signal line and the first system ground plane is formed around an output side of the signal line; a second earth ground plane, formed on a second layer; a second system ground plane, formed on the second layer, wherein the second earth ground plane and the second system ground plane are separated by a second gap; a first via, electrically connecting the first earth ground plane and the second earth ground plane; and a second via, electrically connecting the first system ground plane and the second system ground plane.Brief Description of the Drawings

[0007] FIG. 1A is a schematic diagram of a top view of a signal line structure according to an embodiment of the present invention. FIG. 1B is a schematic diagram of a bottom view of the signal line structure in FIG. 1A according to an embodiment of the present invention. FIG. 1C is a schematic diagram of a side view of the signal line structure in FIG. 1A according to an embodiment of the present invention. FIG. 2 is a schematic diagram of a side view of a signal line structure according to another embodiment of the present invention. FIG. 3 is a schematic diagram of a side view of a signal line structure according to another embodiment of the present invention. FIG. 4 is a schematic diagram of a side view of a signal line structure according to another embodiment of the present invention. FIG. 5 is a schematic diagram of a side view of a signal line structure according to another embodiment of the present invention. FIG. 6 is a schematic diagram of a side view of a signal line structure according to another embodiment of the present invention. FIG. 7 is a schematic diagram of a signal line structure according to an embodiment of the present invention. FIG. 8A is a schematic diagram of an interdigital gap according to an embodiment of the present invention. FIG. 8B is a schematic diagram of a meander gap according to an embodiment of the present invention. Detailed Description

[0008] Certain terms are used throughout the description and following claims to refer to particular components. As one skilled in the art will appreciate, hardware manufacturers may refer to a component by different names. This document does not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms "include" and "comprise" are utilized in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to". Also, the term "couple" is intended to mean either an indirect or direct electrical connection. Accordingly, if one device is coupled to another device, that connection may be through a direct electrical connection, or through an indirect electrical connection via other devices and connections.

[0009] Please refer to FIGS. 1A, 1B and 1C. FIGS. 1A, 1B and 1C are schematic diagrams of a top view, a bottom view and a side view of a signal line structure 1 according to an embodiment of the present invention. As shown in FIG. 1A, the signal line structure 1 includes a first earth ground plane 101 formed on a first layer 10, a first system ground plane 102 formed on the first layer 10, and a signal line 103 formed on the first layer 10. The first earth ground plane 101 and the first system ground plane 102 are separated by a first gap GAP1 to reduce the influence of noise from the first earth ground plane 101. Furthermore, the first earth ground plane 101 is formed around an input side of the signal line 103 and the first system ground plane 102 is formed around an output side of the signal line 103 to guard the signal line 103. It should be noted that the signal line 103 is utilized for signal transmission; for example, two ends of the signal line 103 are respectively connected to a transmitter and a receiver. In addition, as shown in FIG. 1B, the signal line structure 1 includes a second earth ground plane 201 formed on a second layer 20 and a second system ground plane 202 formed on the second layer 20. The second earth ground plane 201 and the second system ground plane 202 are separated by a second gap GAP2. As shown in FIG. 1C, the signal line structure 1 includes a first via VIA1 electrically connecting the first earth ground plane 101 and the second earth ground plane 201, and a second via VIA2 electrically connecting the first system ground plane 102 and the second system ground plane 202. It should be noted that the first earth ground plane 101, the first system ground plane 102, the second earth ground plane 201, the second system ground plane 202, the first via VIA1 and the second via VIA2 may be fabricated by a conductor material and separated from each other by a dielectric material.

[0010] On the other hand, as shown in FIG. 1C, a projected area of the first gap GAP1 relative to the second layer 20 may overlaps with a projected area of the second gap GAP2 relative to the second layer. However, the symmetrical design of the first gap GAP1 and the second gap GAP2 may result in a constructive enhancement between a radiation of the first layer 10 and a radiation of the second layer 20.

[0011] In an embodiment, the present invention may add a shielding plane between the first gap GAP1 and the second gap GAP2 to suppress the constructive enhancement of the radiations. Please refer to FIG. 2. FIG. 2 is a schematic diagram of a side view of a signal line structure 2 according to an embodiment of the present invention. The signal line structure 2 is derived from the signal line structure 1, so the elements are represented by the same symbols. The difference between the signal line structure 2 and the signal line structure 1 is that the signal line structure 2 further includes a shielding plane 301 formed on a third layer 30 and arranged between the first gap GAP1 and the second gap GAP2. It should be noted that the third layer 30 is between the first layer 10 and the second layer 20. In addition, the shielding plane 301 cannot be floating, otherwise the shielding plane 301 may serve as a transmission medium for noise. Therefore, the shielding plane 301 is electrically connected to the first earth ground plane 101 or the second earth ground plane 201 through the first via VIA1 or a third via (not shown in FIG. 2) when a projected area of the shielding plane 301 relative to the second layer 20 overlaps with a projected area of the first earth ground plane 101 relative to the second layer 20 and a projected area of the second earth ground plane 201 relative to the second layer 20. On the other side, as long as the shielding plane 301 does not contact the second via VIA2, a projected area of the shielding plane 301 relative to the second layer 20 may not overlap or may partially overlap with a projected area of the first system ground plane 102 relative to the second layer 20 and a projected area of the second system ground plane 202 relative to the second layer 20, but is not limited thereto. Similarly, in another embodiment (not shown in FIG. 2), the shielding plane 301 may be electrically connected to the first system ground plane 102 or the second system ground plane 202 through the second via VIA2 or other via. On the other side, as long as the shielding plane 301 does not contact the first via VIA1, a projected area of the shielding plane 301 relative to the second layer 20 may not overlap or may partially overlap with a projected area of the first earth ground plane 101 relative to the second layer 20 and a projected area of the second earth ground plane 201 relative to the second layer 20, but is not limited thereto.

[0012] In another embodiment, the present invention may dislocate the first gap GAP1 and the second gap GAP2 to suppress the constructive enhancement of the radiations. Please refer to FIG. 3. FIG. 3 is a schematic diagram of a side view of a side view of a signal line structure 3 according to an embodiment of the present invention. The signal line structure 3 is derived from the signal line structure 1, so the elements are represented by the same symbols. The difference between the signal line structure 3 and the signal line structure 1 is that a projected area of the first gap GAP1 relative to the second layer 20 does not overlap with and a projected area of the second gap GAP2 relative to the second layer 20. In comparison, the asymmetric design of the first gap GAP1 and the second gap GAP2 allows for smaller constructive enhancement between a radiation of the first layer 10 and a radiation of the second layer 20.

[0013] Furthermore, the signal line structure 3 may add a shielding plane between the first gap GAP1 and the second gap GAP2 to further suppress the constructive enhancement of the radiations. Please refer to FIG. 4. FIG. 4 is a schematic diagram of a side view of a signal line structure 4 according to an embodiment of the present invention. The signal line structure 4 is derived from the signal line structure 3, so the elements are represented by the same symbols. The difference between the signal line structure 4 and the signal line structure 3 is that the signal line structure 2 further includes the shielding plane 301 formed on the third layer 30 and arranged between the first gap GAP1 and the second gap GAP2. Specifically, the shielding plane 301 is electrically connected to the first earth ground plane 101 or the second earth ground plane 201 through the first via VIA1 or other via when a projected area of the shielding plane 301 relative to the second layer 20 overlaps with a projected area of the first earth ground plane 101 relative to the second layer 20 and a projected area of the second earth ground plane 201 relative to the second layer 20. On the other side, as long as the shielding plane 301 does not contact the second via VIA2, a projected area of the shielding plane 301 relative to the second layer 20 may not overlap or may partially overlap with a projected area of the first system ground plane 102 relative to the second layer 20 and a projected area of the second system ground plane 202 relative to the second layer 20, but is not limited thereto. Similarly, in another embodiment (not shown in FIG. 4), the shielding plane 301 may be electrically connected to the first system ground plane 102 or the second system ground plane 202 through the second via VIA2 or other via. On the other side, as long as the shielding plane 301 does not contact the first via VIA1, a projected area of the shielding plane 301 relative to the second layer 20 may not overlap or may partially overlap with a projected area of the first earth ground plane 101 relative to the second layer 20 and a projected area of the second earth ground plane 201 relative to the second layer 20, but is not limited thereto.

[0014] It should be noted that those skilled in the art may appropriately design the signal line structure. For example, please refer to FIG. 5 and FIG. 6. FIG. 5 and FIG. 6 are schematic diagrams of side views of signal line structures 5, 6 according to embodiments of the present invention. In the signal line structure 5 and the signal line structure 6, a projected area of the first gap GAP1 relative to the second layer 20 partially overlaps with and a projected area of the second gap GAP2 relative to the second layer 20. The asymmetric design of the first gap GAP1 and the second gap GAP2 allows for smaller constructive enhancement between a radiation of the first layer 10 and a radiation of the second layer 20. In addition, the signal line structure 6 further includes the shielding plane 301 formed on the third layer 30 and arranged between the first gap GAP1 and the second gap GAP2. The detail description and derivative changes of the signal line structure 6 are described as above, and will not repeated here.

[0015] It should be noted that the signal line structures 1-6 are different embodiments of the present invention, and those skilled in the art may make different modifications accordingly, and are not limited thereto. For example, FIG. 7 is a schematic diagram of a signal line structure 7 according to an embodiment of the present invention. The signal line structure 7 is utilized for RF transmission. The input end of the signal line structure 7 is an antenna feed into or directly connected to antennas, and the output end of the signal line structure 7 is coupled to the electronic system. Furthermore, the signal line structure 7 may further include a shorted stub plane to reduce energy of surge and ESD. The design principle of the shorted stub plane should be well known in the art, so it is not repeated here. In another embodiment, please refer to FIGS. 8A and 8B, the gap between the ground plane and the system plane may be formed in different shapes. For example, the first gap GAP1 and the second gap GAP2 in FIG. 8A are formed in an interdigital type, and the first gap GAP1 and the second gap GAP2 in FIG. 8B are formed in a meander type, but are not limited thereto.

[0016] In summary, in the present invention, the shielding plane is formed between the first gap and the second gap. In addition, the first gap dislocates with the second gap. In this way, the constructive enhancement of the radiations can be effectively suppressed.

Examples

Embodiment Construction

[0008]Certain terms are used throughout the description and following claims to refer to particular components. As one skilled in the art will appreciate, hardware manufacturers may refer to a component by different names. This document does not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms "include" and "comprise" are utilized in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to". Also, the term "couple" is intended to mean either an indirect or direct electrical connection. Accordingly, if one device is coupled to another device, that connection may be through a direct electrical connection, or through an indirect electrical connection via other devices and connections.

[0009]Please refer to FIGS. 1A, 1B and 1C. FIGS. 1A, 1B and 1C are schematic diagrams of a top view, a bottom view and a side view of a signal line structure 1 according to an embodimen...

Field of the Invention

[0001] The present invention relates to a signal line structure, and more particularly, to a signal line structure having an earth ground plane and a system ground plane separated by a gap.Background of the Invention

[0002] In radio frequency (RF) transmission, it is a common practice to surround or shield signal lines or signal paths with a ground plane. The ground plane is typically divided into a system ground and an earth ground, separated by a gap filled with a dielectric material or left air-filled to mitigate the influence of noise from the ground plane on the electrical system. However, parasitic capacitance may be formed across the gap, and the current passes through the discontinuous ground plane (the system ground and the earth ground), causing radiation and antenna effect between the system ground and the earth ground, and increasing the risk of degradation of sensitivity (Desense) of the electrical system.

[0003] Under this circumstance, how to design the ground plane of the signal line structure to suppress the noise, radiation and antenna effect has become one of the goals in the industry.Summary of the Invention

[0004] Therefore, the purpose of the present invention is to provide a signal line structure to improve the drawback of the prior art.

[0005] This is achieved by a signal line structure according to claim 1. The dependent claims pertain to corresponding further developments and improvements.

[0006] As will be seen more clearly from the detailed description following below, a signal line structure is disclosed herein. The signal line structure includes a first earth ground plane, formed on a first layer; a first system ground plane, formed on the first layer, wherein the first earth ground plane and the first system ground plane are separated by a first gap; a signal line, formed on the first layer, utilized for signal transmission, wherein the first earth ground plane is formed around an input side of the signal line and the first system ground plane is formed around an output side of the signal line; a second earth ground plane, formed on a second layer; a second system ground plane, formed on the second layer, wherein the second earth ground plane and the second system ground plane are separated by a second gap; a first via, electrically connecting the first earth ground plane and the second earth ground plane; and a second via, electrically connecting the first system ground plane and the second system ground plane.Brief Description of the Drawings

[0007] FIG. 1A is a schematic diagram of a top view of a signal line structure according to an embodiment of the present invention. FIG. 1B is a schematic diagram of a bottom view of the signal line structure in FIG. 1A according to an embodiment of the present invention. FIG. 1C is a schematic diagram of a side view of the signal line structure in FIG. 1A according to an embodiment of the present invention. FIG. 2 is a schematic diagram of a side view of a signal line structure according to another embodiment of the present invention. FIG. 3 is a schematic diagram of a side view of a signal line structure according to another embodiment of the present invention. FIG. 4 is a schematic diagram of a side view of a signal line structure according to another embodiment of the present invention. FIG. 5 is a schematic diagram of a side view of a signal line structure according to another embodiment of the present invention. FIG. 6 is a schematic diagram of a side view of a signal line structure according to another embodiment of the present invention. FIG. 7 is a schematic diagram of a signal line structure according to an embodiment of the present invention. FIG. 8A is a schematic diagram of an interdigital gap according to an embodiment of the present invention. FIG. 8B is a schematic diagram of a meander gap according to an embodiment of the present invention. Detailed Description

[0008] Certain terms are used throughout the description and following claims to refer to particular components. As one skilled in the art will appreciate, hardware manufacturers may refer to a component by different names. This document does not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms "include" and "comprise" are utilized in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to". Also, the term "couple" is intended to mean either an indirect or direct electrical connection. Accordingly, if one device is coupled to another device, that connection may be through a direct electrical connection, or through an indirect electrical connection via other devices and connections.

[0009] Please refer to FIGS. 1A, 1B and 1C. FIGS. 1A, 1B and 1C are schematic diagrams of a top view, a bottom view and a side view of a signal line structure 1 according to an embodiment of the present invention. As shown in FIG. 1A, the signal line structure 1 includes a first earth ground plane 101 formed on a first layer 10, a first system ground plane 102 formed on the first layer 10, and a signal line 103 formed on the first layer 10. The first earth ground plane 101 and the first system ground plane 102 are separated by a first gap GAP1 to reduce the influence of noise from the first earth ground plane 101. Furthermore, the first earth ground plane 101 is formed around an input side of the signal line 103 and the first system ground plane 102 is formed around an output side of the signal line 103 to guard the signal line 103. It should be noted that the signal line 103 is utilized for signal transmission; for example, two ends of the signal line 103 are respectively connected to a transmitter and a receiver. In addition, as shown in FIG. 1B, the signal line structure 1 includes a second earth ground plane 201 formed on a second layer 20 and a second system ground plane 202 formed on the second layer 20. The second earth ground plane 201 and the second system ground plane 202 are separated by a second gap GAP2. As shown in FIG. 1C, the signal line structure 1 includes a first via VIA1 electrically connecting the first earth ground plane 101 and the second earth ground plane 201, and a second via VIA2 electrically connecting the first system ground plane 102 and the second system ground plane 202. It should be noted that the first earth ground plane 101, the first system ground plane 102, the second earth ground plane 201, the second system ground plane 202, the first via VIA1 and the second via VIA2 may be fabricated by a conductor material and separated from each other by a dielectric material.

[0010] On the other hand, as shown in FIG. 1C, a projected area of the first gap GAP1 relative to the second layer 20 may overlaps with a projected area of the second gap GAP2 relative to the second layer. However, the symmetrical design of the first gap GAP1 and the second gap GAP2 may result in a constructive enhancement between a radiation of the first layer 10 and a radiation of the second layer 20.

[0011] In an embodiment, the present invention may add a shielding plane between the first gap GAP1 and the second gap GAP2 to suppress the constructive enhancement of the radiations. Please refer to FIG. 2. FIG. 2 is a schematic diagram of a side view of a signal line structure 2 according to an embodiment of the present invention. The signal line structure 2 is derived from the signal line structure 1, so the elements are represented by the same symbols. The difference between the signal line structure 2 and the signal line structure 1 is that the signal line structure 2 further includes a shielding plane 301 formed on a third layer 30 and arranged between the first gap GAP1 and the second gap GAP2. It should be noted that the third layer 30 is between the first layer 10 and the second layer 20. In addition, the shielding plane 301 cannot be floating, otherwise the shielding plane 301 may serve as a transmission medium for noise. Therefore, the shielding plane 301 is electrically connected to the first earth ground plane 101 or the second earth ground plane 201 through the first via VIA1 or a third via (not shown in FIG. 2) when a projected area of the shielding plane 301 relative to the second layer 20 overlaps with a projected area of the first earth ground plane 101 relative to the second layer 20 and a projected area of the second earth ground plane 201 relative to the second layer 20. On the other side, as long as the shielding plane 301 does not contact the second via VIA2, a projected area of the shielding plane 301 relative to the second layer 20 may not overlap or may partially overlap with a projected area of the first system ground plane 102 relative to the second layer 20 and a projected area of the second system ground plane 202 relative to the second layer 20, but is not limited thereto. Similarly, in another embodiment (not shown in FIG. 2), the shielding plane 301 may be electrically connected to the first system ground plane 102 or the second system ground plane 202 through the second via VIA2 or other via. On the other side, as long as the shielding plane 301 does not contact the first via VIA1, a projected area of the shielding plane 301 relative to the second layer 20 may not overlap or may partially overlap with a projected area of the first earth ground plane 101 relative to the second layer 20 and a projected area of the second earth ground plane 201 relative to the second layer 20, but is not limited thereto.

[0012] In another embodiment, the present invention may dislocate the first gap GAP1 and the second gap GAP2 to suppress the constructive enhancement of the radiations. Please refer to FIG. 3. FIG. 3 is a schematic diagram of a side view of a side view of a signal line structure 3 according to an embodiment of the present invention. The signal line structure 3 is derived from the signal line structure 1, so the elements are represented by the same symbols. The difference between the signal line structure 3 and the signal line structure 1 is that a projected area of the first gap GAP1 relative to the second layer 20 does not overlap with and a projected area of the second gap GAP2 relative to the second layer 20. In comparison, the asymmetric design of the first gap GAP1 and the second gap GAP2 allows for smaller constructive enhancement between a radiation of the first layer 10 and a radiation of the second layer 20.

[0013] Furthermore, the signal line structure 3 may add a shielding plane between the first gap GAP1 and the second gap GAP2 to further suppress the constructive enhancement of the radiations. Please refer to FIG. 4. FIG. 4 is a schematic diagram of a side view of a signal line structure 4 according to an embodiment of the present invention. The signal line structure 4 is derived from the signal line structure 3, so the elements are represented by the same symbols. The difference between the signal line structure 4 and the signal line structure 3 is that the signal line structure 2 further includes the shielding plane 301 formed on the third layer 30 and arranged between the first gap GAP1 and the second gap GAP2. Specifically, the shielding plane 301 is electrically connected to the first earth ground plane 101 or the second earth ground plane 201 through the first via VIA1 or other via when a projected area of the shielding plane 301 relative to the second layer 20 overlaps with a projected area of the first earth ground plane 101 relative to the second layer 20 and a projected area of the second earth ground plane 201 relative to the second layer 20. On the other side, as long as the shielding plane 301 does not contact the second via VIA2, a projected area of the shielding plane 301 relative to the second layer 20 may not overlap or may partially overlap with a projected area of the first system ground plane 102 relative to the second layer 20 and a projected area of the second system ground plane 202 relative to the second layer 20, but is not limited thereto. Similarly, in another embodiment (not shown in FIG. 4), the shielding plane 301 may be electrically connected to the first system ground plane 102 or the second system ground plane 202 through the second via VIA2 or other via. On the other side, as long as the shielding plane 301 does not contact the first via VIA1, a projected area of the shielding plane 301 relative to the second layer 20 may not overlap or may partially overlap with a projected area of the first earth ground plane 101 relative to the second layer 20 and a projected area of the second earth ground plane 201 relative to the second layer 20, but is not limited thereto.

[0014] It should be noted that those skilled in the art may appropriately design the signal line structure. For example, please refer to FIG. 5 and FIG. 6. FIG. 5 and FIG. 6 are schematic diagrams of side views of signal line structures 5, 6 according to embodiments of the present invention. In the signal line structure 5 and the signal line structure 6, a projected area of the first gap GAP1 relative to the second layer 20 partially overlaps with and a projected area of the second gap GAP2 relative to the second layer 20. The asymmetric design of the first gap GAP1 and the second gap GAP2 allows for smaller constructive enhancement between a radiation of the first layer 10 and a radiation of the second layer 20. In addition, the signal line structure 6 further includes the shielding plane 301 formed on the third layer 30 and arranged between the first gap GAP1 and the second gap GAP2. The detail description and derivative changes of the signal line structure 6 are described as above, and will not repeated here.

[0015] It should be noted that the signal line structures 1-6 are different embodiments of the present invention, and those skilled in the art may make different modifications accordingly, and are not limited thereto. For example, FIG. 7 is a schematic diagram of a signal line structure 7 according to an embodiment of the present invention. The signal line structure 7 is utilized for RF transmission. The input end of the signal line structure 7 is an antenna feed into or directly connected to antennas, and the output end of the signal line structure 7 is coupled to the electronic system. Furthermore, the signal line structure 7 may further include a shorted stub plane to reduce energy of surge and ESD. The design principle of the shorted stub plane should be well known in the art, so it is not repeated here. In another embodiment, please refer to FIGS. 8A and 8B, the gap between the ground plane and the system plane may be formed in different shapes. For example, the first gap GAP1 and the second gap GAP2 in FIG. 8A are formed in an interdigital type, and the first gap GAP1 and the second gap GAP2 in FIG. 8B are formed in a meander type, but are not limited thereto.

[0016] In summary, in the present invention, the shielding plane is formed between the first gap and the second gap. In addition, the first gap dislocates with the second gap. In this way, the constructive enhancement of the radiations can be effectively suppressed.

Examples

Embodiment Construction

[0008]Certain terms are used throughout the description and following claims to refer to particular components. As one skilled in the art will appreciate, hardware manufacturers may refer to a component by different names. This document does not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms "include" and "comprise" are utilized in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to". Also, the term "couple" is intended to mean either an indirect or direct electrical connection. Accordingly, if one device is coupled to another device, that connection may be through a direct electrical connection, or through an indirect electrical connection via other devices and connections.

[0009]Please refer to FIGS. 1A, 1B and 1C. FIGS. 1A, 1B and 1C are schematic diagrams of a top view, a bottom view and a side view of a signal line structure 1 according to an embodimen...

Claims

1. A signal line structure (1), characterized by comprising: a first earth ground plane (101), formed on a first layer (10); a first system ground plane (102), formed on the first layer (10), wherein the first earth ground plane (101) and the first system ground plane (102) are separated by a first gap (GAP1); a signal line (103), formed on the first layer (10), utilized for signal transmission, wherein the first earth ground plane (101) is formed around an input side of the signal line (103) and the first system ground plane (102) is formed around an output side of the signal line (103); a second earth ground plane (201), formed on a second layer (20); a second system ground plane (202), formed on the second layer (20), wherein the second earth ground plane (201) and the second system ground plane (202) are separated by a second gap (GAP2); a first via (VIA1), electrically connecting the first earth ground plane (101) and the second earth ground plane (201); and a second via (VIA2), electrically connecting the first system ground plane (102) and the second system ground plane (202).

2. The signal line structure (1) of claim 1, characterized by further comprising: a shielding plane (301), formed on a third layer (30) and arranged between the first gap (GAP1) and the second gap (GAP2), wherein the third layer (30) is between the first layer (10) and the second layer (20).

3. The signal line structure (1) of claim 2, characterized in that a projected area of the shielding plane (301) relative to the second layer (20) overlaps with a projected area of the first system ground plane (102) relative to the second layer (20) and a projected area of the second system ground plane (202) relative to the second layer (20), and the shielding plane (301) is electrically connected to the first system ground plane (102) or the second system ground plane (202) through the second via (VIA2) or a third via.

4. The signal line structure (1) of claim 2, characterized in that a projected area of the shielding plane (301) relative to the second layer (20) overlaps with a projected area of the first earth ground plane (101) relative to the second layer (20) and a projected area of the second earth ground plane (201) relative to the second layer (20), and the shielding plane (301) is electrically connected to the first earth ground plane (101) or the second earth ground plane (201) through the first via (VIA1) or a third via.

5. The signal line structure (1) of claim 1, characterized in that a projected area of the first gap (GAP1) relative to the second layer (20) does not overlap with and a projected area of the second gap (GAP2) relative to the second layer (20).

6. The signal line structure (1) of claim 5, characterized by further comprising: a shielding plane (301), formed on a third layer (30) and arranged between the first gap (GAP1) and the second gap (GAP2), wherein the third layer (30) is between the first layer (10) and the second layer (20).

7. The signal line structure (1) of claim 6, characterized in that a projected area of the shielding plane (301) relative to the second layer (20) overlaps with a projected area of the first system ground plane (102) relative to the second layer (20) and a projected area of the second system ground plane (202) relative to the second layer (20), and the shielding plane (301) is electrically connected to the first system ground plane (102) or the second system ground plane (202) through the second via (VIA2) or a third via.

8. The signal line structure (1) of claim 6, characterized in that a projected area of the shielding plane (301) relative to the second layer (20) overlaps with a projected area of the first earth ground plane (101) relative to the second layer (20) and a projected area of the second earth ground plane (201) relative to the second layer (20), and the shielding plane (301) is electrically connected to the first earth ground plane (101) or the second earth ground plane (201) through the first via (VIA1) or a third via.

9. The signal line structure (1) of claim 1, characterized in that a projected area of the first gap (GAP1) relative to the second layer (20) partially overlaps with a projected area of the second gap (GAP2) relative to the second layer (20).

10. The signal line structure (1) of claim 9, characterized by further comprising: a shielding plane (301), formed on a third layer (30) and arranged between the first gap (GAP1) and the second gap (GAP2), wherein the third layer (30) is between the first layer (10) and the second layer (20).

11. The signal line structure (1) of claim 10, characterized in that a projected area of the shielding plane (301) relative to the second layer (20) overlaps with a projected area of the first system ground plane (102) relative to the second layer (20) and a projected area of the second system ground plane (202) relative to the second layer (20), and the shielding plane (301) is electrically connected to the first system ground plane (102) or the second system ground plane (202) through the second via (VIA2) or a third via.

12. The signal line structure (1) of claim 10, characterized in that a projected area of the shielding plane (301) relative to the second layer (20) overlaps with a projected area of the first earth ground plane (101) relative to the second layer (20) and a projected area of the second earth ground plane (201) relative to the second layer (20), and the shielding plane (301) is electrically connected to the first earth ground plane (101) or the second earth ground plane (201) through the first via (VIA1) or a third via.

Images