A non-porous substrate integrated coaxial line

Abstract

The application provides a non-porous substrate integrated coaxial line, which comprises two joint sections, two gradient sections and a transmission section, the two gradient sections are arranged at two ends of the transmission section, and the two joint sections are connected to the two gradient sections respectively; the two joint sections, the two gradient sections and the transmission section all comprise a bottom metal substrate, a bottom dielectric substrate, a center conductor strip and two edge conductor strips, the bottom dielectric substrate is arranged on the bottom metal substrate, the center conductor strip and the two edge conductor strips are both arranged on the bottom dielectric substrate, the two edge conductor strips are arranged on both sides of the center conductor strip, the two edge conductor strips are both provided with a connecting strip and a plurality of branches connected with the connecting strip, and a spacing is arranged between adjacent branches; the two gradient sections and the transmission section further comprise an upper dielectric substrate and an upper metal substrate, the upper dielectric substrate is arranged above the center conductor strip and the two edge conductor strips, and the upper metal substrate is arranged above the upper dielectric substrate.

Description

Technical Field

[0001] This invention relates to the field of 5G communication technology, and in particular to a holeless substrate integrated coaxial cable. Background Technology

[0002] With the rapid development of 5G communication systems, the Sub-6GHz band is already commercially available, and the millimeter-wave to terahertz bands have enormous development potential. Millimeter-wave (mmW) communication technology has attracted significant attention due to its ability to support multiple high-speed data link transmissions. As the front-end system of microwave circuits, the transmission line is the foundation of all microwave radio frequency circuits, and its performance greatly affects the transmission system. With the development of integrated circuits and the increasing miniaturization of large-scale integrated circuits and devices, circuit integration is particularly important. This necessitates consideration of interference between adjacent lines in high-density circuits. Therefore, shielded transmission line structures should be prioritized.

[0003] Currently, commonly used shielded transmission lines are categorized into substrate integrated waveguides (SIW), coaxial lines, striplines, and substrate-integrated coaxial lines (SICL). Coaxial lines offer excellent shielding, but their three-dimensional cylindrical structure makes integration with other planar designs difficult. Striplines suffer from lateral leakage and crosstalk issues. Substrate integrated waveguides, a fully shielded design, are widely used in planar integrated circuits; however, their cutoff frequency and bandwidth limit their application in ultra-wideband and ultra-high-speed integrated circuits. Substrate integrated coaxial lines are planar, coaxial-like structures that propagate quasi-TEM modes, thus having no cutoff frequency. They support single-mode operating bandwidths from DC to millimeter-wave bands, and due to their inherent shielding performance, interference resistance, and ease of integration with their planar structure, they are widely used in microwave and millimeter-wave communication systems, such as... Figure 13 As shown in the diagram, the structure reveals through-holes in the substrate integrated coaxial cable, connecting the upper and lower layers. Drilling these through-holes in the fragile dielectric material is difficult, and they inevitably introduce inductance. Furthermore, with frequencies reaching the terahertz range, it becomes increasingly difficult to fabricate through-holes in the substrate. Summary of the Invention

[0004] In view of this, embodiments of the present invention provide a non-porous substrate integrated coaxial line to eliminate or improve one or more defects present in the prior art.

[0005] One aspect of the present invention provides a non-porous substrate integrated coaxial line, the non-porous substrate integrated coaxial line comprising two connector sections, two gradient sections and a transmission section, the two gradient sections being disposed at both ends of the transmission section, and the two connector sections being respectively connected to both ends of the two gradient sections;

[0006] The two connector sections, two transition sections, and the transmission section each include a bottom metal substrate, a bottom dielectric substrate, a central conductor strip, and two edge conductor strips. The bottom dielectric substrate is disposed above the bottom metal substrate. The central conductor strip and the two edge conductor strips are also disposed above the bottom dielectric substrate. The central conductor strip extends from one end of the bottom dielectric substrate to the other end along the length direction of the bottom dielectric substrate. The two edge conductor strips are disposed on both sides of the central conductor strip. Each of the two edge conductor strips is provided with a connecting strip and multiple branches connected to the connecting strip. The branches extend in a direction away from the central conductor strip, and there is a gap between adjacent branches.

[0007] The two gradient sections and the transmission section also include an upper dielectric substrate and an upper metal substrate, wherein the upper dielectric substrate is disposed above the center conductor strip and the two edge conductor strips, and the upper metal substrate is disposed above the upper dielectric substrate.

[0008] Using the above solution, this solution replaces the metal sidewall method of the prior art by setting continuous branches at the edge of the copper-clad metal ground plane, which is easier to process than the mode conversion transmission line of the prior art; and the main transmission line is a double-layer structure in the middle, that is, the central conductor strip 3 and the two edge conductor strips 4 are set between the upper dielectric substrate 2 and the bottom dielectric substrate 8, which are two non-porous dielectric plates stacked together, which can be regarded as a "fully shielded" structure. The fully shielded transmission line has the advantages of less leakage and less wave leakage compared with the half-planar transmission line.

[0009] In some embodiments of the present invention, a plurality of branches are provided, and the plurality of branches are evenly arranged at the edge of the connecting strip.

[0010] In some embodiments of the present invention, the upper metal substrate in the gradient section is provided with a notch, the notch being located on the side of the upper metal substrate away from the transmission section.

[0011] In some embodiments of the invention, the width of the notch in the transition section gradually increases in the direction of proximity to the adjacent joint section.

[0012] In some embodiments of the present invention, the width of the notch on the side away from the joint segment is 0.2~0.4mm, and the width of the notch on the side closer to the joint segment is 2.5~2.7mm.

[0013] In some embodiments of the present invention, a gap is provided between the center conductor strip and the edge conductor strip, and the gap in the gradient section gradually decreases in width from the connection point between the gradient section and the connector section to the connection point between the gradient section and the transmission section.

[0014] In some embodiments of the present invention, the width of the gap at the connection between the transition section and the connector section is 0.11-0.13 mm; the width of the gap at the connection between the transition section and the transmission section is 0.07-0.09 mm.

[0015] In some embodiments of the present invention, the central conductor strip has the same width at all points in the joint section, the central conductor strip has the same width at all points in the transmission section, and the width of the central conductor strip in the joint section is greater than the width of the central conductor strip in the transmission section.

[0016] In some embodiments of the invention, the width of the central conductor strip in the transition section gradually decreases from the connection point with the connector section to the connection point with the transmission section.

[0017] In some embodiments of the present invention, the width of the center conductor strip in the transition section at the connection between the transition section and the connector section is 0.4~0.5mm; the width of the center conductor strip in the transition section at the connection between the transition section and the transmission section is 0.1~0.2mm.

[0018] Additional advantages, objects, and features of the invention will be set forth in part in the description which follows, and will also become apparent in part to those skilled in the art upon studying the text, or may be learned by practice of the invention. The objects and other advantages of the invention will become apparent from the description and the accompanying drawings.

[0019] Those skilled in the art will understand that the objectives and advantages achievable with the present invention are not limited to those specifically described above, and that the above and other objectives achievable with the present invention will become clearer from the following detailed description. Attached Figure Description

[0020] The accompanying drawings, which are provided to further illustrate the invention and form part of this application, are not intended to limit the scope of the invention.

[0021] Figure 1 This is a schematic diagram of one embodiment of the non-porous substrate integrated coaxial line of the present invention;

[0022] Figure 2 This is a top view schematic diagram of one embodiment of the non-porous substrate integrated coaxial line of the present invention;

[0023] Figure 3A schematic diagram showing the central conductor strip and two edge conductor strips disposed on the bottom dielectric substrate;

[0024] Figure 4 for Figure 3 A magnified view of a section at point A in the middle;

[0025] Figure 5 This is a side view of one embodiment of the non-porous substrate integrated coaxial line of the present invention.

[0026] Figure 6 This is a schematic diagram of the S11 parameter test results for the non-porous substrate integrated coaxial line of the present invention;

[0027] Figure 7 This is a schematic diagram of the S21 parameter test results for the non-porous substrate integrated coaxial line of the present invention;

[0028] Figure 8 The electric field distribution of the non-porous substrate integrated coaxial line of the present invention at 20 GHz;

[0029] Figure 9 The electric field distribution of the non-porous substrate integrated coaxial line of the present invention at 40 GHz;

[0030] Figure 10 The electric field distribution of the non-porous substrate integrated coaxial line of the present invention at 60 GHz is shown.

[0031] Figure 11 The electric field distribution of the non-porous substrate integrated coaxial line of the present invention at 80 GHz is shown.

[0032] Figure 12 This is an electric field distribution diagram of the non-porous substrate integrated coaxial line of the present invention at 100 GHz;

[0033] Figure 13 A schematic diagram of a coaxial cable integrated into a substrate using existing technology.

[0034] Explanation of reference numerals in the attached figures

[0035] The technical solution of the present invention can be more clearly understood and explained through the above description of the reference numerals in the accompanying drawings and in conjunction with the embodiments of the present invention.

[0036] 1. Upper metal substrate; 11. Notch; 2. Upper dielectric substrate; 3. Center conductor strip; 4. Edge conductor strip; 41. Connecting strip; 42. Stub; 5. Connector segment; 6. Gradient segment; 7. Transmission segment; 8. Bottom dielectric substrate; 9. Bottom metal substrate. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the embodiments and accompanying drawings. Here, the illustrative embodiments and descriptions of this invention are used to explain the invention, but are not intended to limit the invention.

[0038] It should also be noted that, in order to avoid obscuring the invention with unnecessary details, only the structures and / or processing steps closely related to the solution according to the invention are shown in the accompanying drawings, while other details that are not closely related to the invention are omitted.

[0039] It should be emphasized that the term "including / comprises" as used herein refers to the presence of a feature, element, step, or component, but does not exclude the presence or addition of one or more other features, elements, steps, or components.

[0040] It should also be noted that, unless otherwise specified, the term "connection" in this article can refer not only to a direct connection, but also to an indirect connection involving an intermediary.

[0041] In the following description, embodiments of the invention will be illustrated with reference to the accompanying drawings. In the drawings, the same reference numerals represent the same or similar parts, or the same or similar steps.

[0042] To solve the above problems, such as Figure 1 and 2 As shown, the present invention proposes a non-porous substrate integrated coaxial line, which includes two connector sections 5, two gradient sections 6 and a transmission section 7. The two gradient sections 6 are disposed at both ends of the transmission section 7, and the two connector sections 5 are respectively connected to the two ends of the two gradient sections 6.

[0043] like Figure 3 , 4 As shown in Figure 5, the two connector sections 5, the two transition sections 6, and the transmission section 7 each include a bottom metal substrate 9, a bottom dielectric substrate 8, a central conductor strip 3, and two edge conductor strips 4. The bottom dielectric substrate 8 is disposed above the bottom metal substrate 9. The central conductor strip 3 and the two edge conductor strips 4 are both disposed above the bottom dielectric substrate 8. The central conductor strip 3 extends from one end of the bottom dielectric substrate 8 to the other end along the length direction of the bottom dielectric substrate 8. The two edge conductor strips 4 are disposed on both sides of the central conductor strip 3. Each of the two edge conductor strips 4 is provided with a connecting strip 41 and multiple branches 42 connected to the connecting strip 41. The branches 42 extend in a direction away from the central conductor strip 3, and there is a gap between adjacent branches 42.

[0044] In the specific implementation process, the branch 42 extends from the connecting strip 41 in a direction away from the central conductor strip 3, with an extension length of 0.5~0.7mm, preferably 0.6mm; taking the direction away from the central conductor strip 3 as the first direction, the width of the branch 42 perpendicular to the first direction is 0.1~0.3mm, preferably 0.2mm.

[0045] In the specific implementation process, the interval between adjacent branches 42 is set to be 0.1~0.3mm, preferably 0.2mm.

[0046] In the specific implementation process, the edge conductor strip 4 and the center conductor strip 3 are of equal length in the length direction of the bottom dielectric substrate 8.

[0047] In the specific implementation process, the bottom dielectric substrate 8 is connected to the upper surface of the bottom metal substrate 9, and the central conductor strip 3 and the two edge conductor strips 4 are both connected to the upper surface of the bottom dielectric substrate 8.

[0048] The two gradient sections 6 and the transmission section 7 also include an upper dielectric substrate 2 and an upper metal substrate 1. The upper dielectric substrate 2 is disposed above the central conductor strip 3 and the two edge conductor strips 4, and the upper metal substrate 1 is disposed above the upper dielectric substrate 2.

[0049] Using the above scheme, the main transmission line is a double-layer structure in the middle, that is, the central conductor strip 3 and the two edge conductor strips 4 are placed between the upper dielectric substrate 2 and the bottom dielectric substrate 8. It is composed of two non-porous dielectric plates stacked together, which can be regarded as a "fully shielded" structure. The fully shielded transmission line has the advantages of less leakage and less wave leakage compared with the half-planar transmission line.

[0050] This solution's holeless substrate-integrated coaxial line transmits quasi-TEM mode without a cutoff frequency, giving it a wide bandwidth advantage. Traditional substrate-integrated waveguides have a cutoff frequency, resulting in narrow bandwidth. Traditional coaxial lines, as a fully shielded design, are not easy to integrate with other planar designs due to their three-dimensional cylindrical structure. From a manufacturing perspective, this solution, compared to traditional substrate-integrated coaxial lines, proposes a holeless substrate-integrated coaxial line that uses periodic stubs to replace the metal sidewall vias on both sides, avoiding the drilling process and reducing the manufacturing difficulty of multilayer integrated circuits.

[0051] In the specific implementation process, the upper dielectric substrate 2 and the upper metal substrate 1 are only provided in two gradient sections 6 and transmission sections 7.

[0052] In the specific implementation process, the upper metal substrate 1 and the lower metal substrate 9 can both be made of copper-clad metal, and the upper dielectric substrate 2, the lower dielectric substrate 8, the central conductor strip 3 and the two edge conductor strips 4 are all made of Rogers 5880 material.

[0053] Using the above-mentioned approach, this paper proposes a hole-free substrate integrated coaxial line for ultra-high-speed transmission systems. Traditional substrate integrated coaxial lines are multilayer circuits composed of two layers of substrate material. Conventional multilayer circuits require metal vias that penetrate the substrate material. This novel design achieves a hole-free design for the two-layer circuit, providing a theoretical and design basis for hole-free design of multilayer circuits / large-scale integrated circuits.

[0054] In some embodiments of the present invention, a plurality of branches 42 are provided, and the plurality of branches 42 are evenly arranged at the edge of the connecting strip 41.

[0055] In the specific implementation process, the width of the connecting strip 41 is equal at all points in the joint section 5, and the width of the connecting strip 41 is equal at all points in the transmission section 7. The width of the connecting strip 41 at the joint section 5 is greater than the width of the connecting strip 41 at the transmission section 7.

[0056] In some embodiments of the present invention, the width of the connecting strip 41 at the junction of the gradient section 6 and the connector section 5 is 0.15~0.17mm, preferably 0.16mm; the width of the connecting strip 41 at the junction of the gradient section 6 and the transmission section 7 is 0.1~0.12mm, preferably 0.11mm.

[0057] In the specific implementation process, the width of the connecting strip 41 in the gradient section 6 gradually changes from 0.16mm to 0.11mm.

[0058] like Figure 2 As shown, in some embodiments of the present invention, the upper metal substrate 1 located in the gradient section 6 is provided with a notch 11, the notch 11 being located on the side of the upper metal substrate 1 away from the transmission section 7.

[0059] In the specific implementation process, the notch 11 can be a trapezoidal notch 11, and the shape of the trapezoidal notch 11 can be an isosceles trapezoid.

[0060] In some embodiments of the present invention, the width of the notch 11 in the transition segment 6 gradually increases in the direction close to the adjacent joint segment 5.

[0061] In some embodiments of the present invention, the width of the notch 11 on the side away from the joint segment 5 is 0.2~0.4mm, and the width of the notch 11 on the side closer to the joint segment 5 is 2.5~2.7mm.

[0062] In a preferred embodiment of the present invention, the width of the notch 11 on the side away from the joint segment 5 is 0.3 mm, and the width of the notch 11 on the side closer to the joint segment 5 is 2.6 mm.

[0063] In some embodiments of the present invention, a gap is provided between the center conductor strip 3 and the edge conductor strip 4, and the gap in the gradient section 6 gradually narrows from the connection point of the gradient section 6 and the connector section 5 to the connection point of the gradient section 6 and the transmission section 7.

[0064] In some embodiments of the present invention, the width of the gap at the connection between the gradient section 6 and the connector section 5 is 0.11-0.13 mm; the width of the gap at the connection between the gradient section 6 and the transmission section 7 is 0.07-0.09 mm.

[0065] In a preferred embodiment of the present invention, the width of the gap at the connection between the gradient section 6 and the connector section 5 is 0.12 mm; the width of the gap at the connection between the gradient section 6 and the transmission section 7 is 0.08 mm.

[0066] In some embodiments of the present invention, the central conductor strip 3 has the same width at all points in the joint section 5, the central conductor strip 3 has the same width at all points in the transmission section 7, and the width of the central conductor strip 3 at the joint section 5 is greater than the width of the central conductor strip 3 at the transmission section 7.

[0067] In some embodiments of the invention, the width of the central conductor strip 3 in the transition section 6 gradually decreases from the connection point with the connector section 5 to the connection point with the transmission section 7.

[0068] In some embodiments of the present invention, the width of the center conductor strip 3 in the transition section 6 at the connection between the transition section 6 and the connector section 5 is 0.4~0.5mm; the width of the center conductor strip 3 in the transition section 6 at the connection between the transition section 6 and the transmission section 7 is 0.1~0.2mm.

[0069] In a preferred embodiment of the present invention, the width of the center conductor strip 3 in the transition section 6 at the connection between the transition section 6 and the connector section 5 is 0.45 mm; the width of the center conductor strip 3 in the transition section 6 at the connection between the transition section 6 and the transmission section 7 is 0.15 mm; the width of the center conductor strip 3 in the connector section 5 is 0.45 mm; and the width of the center conductor strip 3 in the transmission section 7 is 0.15 mm.

[0070] Using the above scheme, in this scheme, the width of the central conductor strip 3 in the transition section 6 gradually decreases from the connection point with the connector section 5 to the connection point with the transmission section 7. Conversely, the width of the gap 11 in the transition section 6 gradually increases in the direction close to the adjacent connector section 5. That is, the direction of gap narrowing in this scheme is the same as the direction of width narrowing of the central conductor strip. Figure 8-12 As can be seen from the electric field distribution at the gap, these two parts work together through structural matching to achieve impedance matching and field pattern matching between the connector section and the transmission section, thereby improving the matching degree and enhancing the transmission effect.

[0071] Using the above scheme, electrical measurements can be directly performed and integrated with other board-type transmission lines / devices via the connector section. This part is mainly used for power supply to the transmission line. The trapezoidal gradient structure of this scheme can achieve impedance matching and field-mode matching, completing the impedance gradient process.

[0072] Experimental Example

[0073] like Figures 1-5 As shown, the non-porous substrate integrated coaxial cable includes two connector sections 5, two gradient sections 6, and a transmission section 7. The two gradient sections 6 are disposed at both ends of the transmission section 7, and the two connector sections 5 are respectively connected to both ends of the two gradient sections 6.

[0074] The two connector sections 5, the two transition sections 6, and the transmission section 7 each include a bottom metal substrate 9, a bottom dielectric substrate 8, a central conductor strip 3, and two edge conductor strips 4. The bottom dielectric substrate 8 is disposed above the bottom metal substrate 9. The central conductor strip 3 and the two edge conductor strips 4 are both disposed above the bottom dielectric substrate 8. The central conductor strip 3 extends from one end of the bottom dielectric substrate 8 to the other end along the length direction of the bottom dielectric substrate 8. The two edge conductor strips 4 are disposed on both sides of the central conductor strip 3. Each of the two edge conductor strips 4 is provided with a connecting strip 41 and multiple branches 42 connected to the connecting strip 41. The branches 42 extend in a direction away from the central conductor strip 3, and there is a gap between adjacent branches 42.

[0075] The branch 42 extends from the connecting strip 41 in a direction away from the central conductor strip 3, with an extension length of 0.6 mm; taking the direction away from the central conductor strip 3 as the first direction, the width of the branch 42 perpendicular to the first direction is 0.2 mm; the interval between adjacent branches 42 is 0.2 mm.

[0076] Along the length of the underlying dielectric substrate 8, the edge conductor strip 4 and the center conductor strip 3 are of equal length.

[0077] The thickness of the central conductor strip 3 and the two edge conductor strips 4 is 0.035 mm.

[0078] The bottom dielectric substrate 8 is connected to the upper surface of the bottom metal substrate 9, and the central conductor strip 3 and the two edge conductor strips 4 are both connected to the upper surface of the bottom dielectric substrate 8.

[0079] The two gradient sections 6 and the transmission section 7 also include an upper dielectric substrate 2 and an upper metal substrate 1. The upper dielectric substrate 2 is disposed above the central conductor strip 3 and the two edge conductor strips 4, and the upper metal substrate 1 is disposed above the upper dielectric substrate 2.

[0080] The upper dielectric substrate 2 and the upper metal substrate 1 are only provided in two gradient sections 6 and transmission sections 7.

[0081] The upper metal substrate 1 and the lower metal substrate 9 are made of copper-clad metal. The upper dielectric substrate 2, the lower dielectric substrate 8, the center conductor strip 3 and the two edge conductor strips 4 are all made of Rogers 5880 material with a relative permittivity of 2.2 and a loss tangent of 0.0009.

[0082] The bottom dielectric substrate 8 has a thickness of 0.127 mm, a total length of 56 mm, and a width of 8 mm; the bottom metal substrate 9 has a thickness of 0.035 mm, a length of 56 mm, and a width of 8 mm; the top dielectric substrate 2 has a thickness of 0.127 mm, a total length of 46.8 mm, and a width of 8 mm; and the top metal substrate 1 has a thickness of 0.035 mm, a length of 46.8 mm, and a width of 8 mm.

[0083] The multiple branches 42 are evenly distributed at the edge of the connecting strip 41.

[0084] The connecting strip 41 has the same width at all points in the joint section 5 and at all points in the transmission section 7. The width of the connecting strip 41 at the joint section 5 is greater than the width of the connecting strip 41 at the transmission section 7.

[0085] The width of the connecting strip 41 at the junction of the gradient section 6 and the connector section 5 is 0.16 mm; the width of the connecting strip 41 at the junction of the gradient section 6 and the transmission section 7 is 0.11 mm.

[0086] The width of the connecting strip 41 in the gradient section 6 gradually changes from 0.16 mm to 0.11 mm.

[0087] The upper metal substrate 1 located in the gradient section 6 is provided with a notch 11, which is located on the side of the upper metal substrate 1 away from the transmission section 7.

[0088] The notch 11 is an isosceles trapezoid.

[0089] The notch 11 has a width of 0.3 mm on the side away from the joint segment 5 and a width of 2.6 mm on the side closer to the joint segment 5.

[0090] The height of the isosceles trapezoid is 3.3 mm.

[0091] A gap is provided between the center conductor strip 3 and the edge conductor strip 4. The gap in the gradient section 6 gradually narrows from the connection point between the gradient section 6 and the connector section 5 to the connection point between the gradient section 6 and the transmission section 7.

[0092] The gap is 0.12 mm wide at the connection between the gradient section 6 and the connector section 5; the gap is 0.08 mm wide at the connection between the gradient section 6 and the transmission section 7.

[0093] The width of the central conductor strip 3 is equal at all points in the joint section 5 and at all points in the transmission section 7. The width of the central conductor strip 3 at the joint section 5 is greater than the width of the central conductor strip 3 at the transmission section 7.

[0094] The width of the central conductor strip 3 in the transition section 6 gradually decreases from the connection point with the connector section 5 to the connection point with the transmission section 7.

[0095] The width of the center conductor strip 3 in the transition section 6 at the connection between the transition section 6 and the connector section 5 is 0.45 mm; the width of the center conductor strip 3 in the transition section 6 at the connection between the transition section 6 and the transmission section 7 is 0.15 mm; the width of the center conductor strip 3 in the connector section 5 is 0.45 mm, and the width of the center conductor strip 3 in the transmission section 7 is 0.15 mm.

[0096] In the specific implementation process, this transmission line adopts a back-to-back, dual-port excitation form, with one port set at each end of the single-layer test connector section, namely the first port and the second port.

[0097] The above transmission line was tested in the DC-100GHz range, and the test results are shown in the figure.

[0098] like Figure 6 and 7 As shown, when the total length of the transmission line is 58mm, the return loss |S11| is better than 10dB in the DC-100GHz range, and the insertion loss |S21| in the same frequency band is better than 4.7dB, which meets the design requirements.

[0099] Figures 8-12 The electric field distribution diagrams of the transmission line shown are at 20GHz, 40GHz, 60GHz, 80GHz and 100GHz. It can be seen that the transmission line can achieve no leakage at the above frequency points without metal through holes. The transmission line can stably propagate signals in the central conductor, and the transmission mode of the transmission line is quasi-TEM mode in the DC to 100GHz operating frequency band.

[0100] In this invention, features described and / or illustrated for one embodiment may be used in the same or similar manner in one or more other embodiments, and / or combined with or in place of features of other embodiments.

[0101] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, various modifications and variations of the embodiments of the present invention are possible. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A non-porous substrate integrated coaxial line, characterized in that, The non-porous substrate integrated coaxial cable includes two connector sections (5), two gradient sections (6) and a transmission section (7). The two gradient sections (6) are disposed at both ends of the transmission section (7), and the two connector sections (5) are respectively connected to both ends of the two gradient sections (6). The two connector sections (5), the two transition sections (6), and the transmission section (7) each include a bottom metal substrate (9), a bottom dielectric substrate (8), a central conductor strip (3), and two edge conductor strips (4). The bottom dielectric substrate (8) is disposed above the bottom metal substrate (9). The central conductor strip (3) and the two edge conductor strips (4) are both disposed above the bottom dielectric substrate (8). The central conductor strip (3) extends from one end of the bottom dielectric substrate (8) to the other end along the length direction of the bottom dielectric substrate (8). The two edge conductor strips (4) are disposed on both sides of the central conductor strip (3). Each of the two edge conductor strips (4) is provided with a connecting strip (41) and multiple branches (42) connected to the connecting strip (41). The branches (42) extend in a direction away from the central conductor strip (3), and there is a gap between adjacent branches (42). The two gradient sections (6) and the transmission section (7) also include an upper dielectric substrate (2) and an upper metal substrate (1), wherein the upper dielectric substrate (2) is disposed above the center conductor strip (3) and the two edge conductor strips (4), and the upper metal substrate (1) is disposed above the upper dielectric substrate (2).

2. The non-porous substrate integrated coaxial line according to claim 1, characterized in that, The branch (42) is provided in multiple ways, and the multiple branches (42) are evenly arranged at the edge of the connecting strip (41).

3. The non-porous substrate integrated coaxial line according to claim 1, characterized in that, The upper metal substrate (1) in the gradient section (6) is provided with a notch (11), which is located on the side of the upper metal substrate (1) away from the transmission section (7).

4. The non-porous substrate integrated coaxial line according to claim 3, characterized in that, The notch (11) in the transition section (6) gradually increases in width in the direction close to the adjacent joint section (5).

5. The non-porous substrate integrated coaxial line according to claim 3 or 4, characterized in that, The width of the notch (11) on the side away from the joint section (5) is 0.2~0.4mm, and the width of the notch (11) on the side close to the joint section (5) is 2.5~2.7mm.

6. The non-porous substrate integrated coaxial line according to claim 1, characterized in that, A gap is provided between the center conductor strip (3) and the edge conductor strip (4), and the gap in the gradient section (6) gradually narrows from the connection point of the gradient section (6) and the connector section (5) to the connection point of the gradient section (6) and the transmission section (7).

7. The non-porous substrate integrated coaxial line according to claim 6, characterized in that, The gap is 0.11-0.13 mm wide at the connection between the gradient section (6) and the connector section (5); the gap is 0.07-0.09 mm wide at the connection between the gradient section (6) and the transmission section (7).

8. The non-porous substrate integrated coaxial line according to claim 1, characterized in that, The width of the central conductor strip (3) is equal at all points in the joint section (5) and at all points in the transmission section (7). The width of the central conductor strip (3) in the joint section (5) is greater than the width of the central conductor strip (3) in the transmission section (7).

9. The non-porous substrate integrated coaxial line according to claim 8, characterized in that, The width of the central conductor strip (3) in the transition section (6) gradually decreases from the connection point with the connector section (5) to the connection point with the transmission section (7).

10. The non-porous substrate integrated coaxial line according to claim 8 or 9, characterized in that, The width of the center conductor strip (3) in the transition section (6) at the connection between the transition section (6) and the connector section (5) is 0.4~0.5mm; the width of the center conductor strip (3) in the transition section (6) at the connection between the transition section (6) and the transmission section (7) is 0.1~0.2mm.

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