A broadband high-reliability flexible interconnection structure

Abstract

The application provides a broadband high-reliability flexible interconnection structure, and belongs to the technical field of radio frequency communication, which comprises an elastic bellows, the elastic bellows is fixedly connected with a first inner conductor and a second inner conductor, the first inner conductor is sleeved with a first medium in the radial direction, and the second inner conductor is sleeved with a second medium in the radial direction; a first outer conductor is sleeved on the outer wall of the first medium, a second outer conductor is sleeved on the outer wall of the second medium, the first outer conductor is internally provided with the second outer conductor through intermittent cooperation, one end of the second outer conductor is in contact with the first medium, the other end of the second outer conductor is in contact with a third outer conductor, and the third outer conductor is arranged in the interior of the first outer conductor through interference fit; in a free state, the second inner conductor protrudes from the end face of the third outer conductor; the self-adaptive adjustment structure is beneficial to conversion between different types of transmission lines, and the application can guarantee excellent microwave radio frequency interconnection performance in a super wide frequency range.

Description

Technical Field

[0001] This invention relates to the field of radio frequency communication technology, and more specifically to a broadband, highly reliable, flexible interconnect structure. Background Technology

[0002] In the field of radio frequency (RF) communication technology, the conversion of signals between transmission lines of different structural types requires a broadband RF interconnect solution. For example, the transmission conversion between coaxial cables and suspended strip lines. To achieve efficient signal transmission, the interconnect structure at discontinuous junctions must be reliable. Broadband RF interconnects are particularly important in high-frequency, broadband applications.

[0003] In common technologies, interconnection at discontinuous transition points typically employs welding or plug-in structures. Welding, due to mechanical stress, is highly susceptible to solder joint breakage and performance degradation during production and subsequent applications, such as repeated disassembly and reassembly. Furthermore, the shape and size of the solder joints are difficult to control, affecting broadband performance and resulting in poor batch production consistency. Plug-in methods suffer from machining and assembly errors between different components. They require high axial and radial tolerances for different components, necessitating strict tolerance control during component machining, leading to higher production costs. Moreover, the assembly process is more complex, making it difficult to guarantee performance consistency. Plug-in methods are primarily used in applications below 40GHz.

[0004] For applications above 40GHz, such as DC~50GHz and DC~67GHz, a highly reliable, convenient, and low-cost interconnection structure is required for radio frequency communication. Summary of the Invention

[0005] Purpose of the Invention: The purpose of this invention is to address the shortcomings of existing technologies by providing a broadband, highly reliable, flexible interconnect structure. This structure employs an adaptively adjustable elastic corrugated tube and a movable inner conductor to switch between different types of transmission lines. This invention easily achieves excellent impedance matching over an ultra-wide frequency range and exhibits superior broadband RF performance. Furthermore, it solves the mechanical stress and production consistency problems caused by soldering and plugging methods, facilitating the mass production of low-cost broadband interconnect devices.

[0006] Technical Solution: The present invention discloses a broadband high-reliability flexible interconnect structure, comprising a conductor, a dielectric, and an elastic element. The elastic element is an elastic bellows. One end of the elastic bellows is connected to a first inner conductor via a first connecting device, and the other end of the elastic bellows is connected to a second inner conductor via a second connecting device. A first dielectric is sleeved on the radial direction of the first inner conductor, and a second dielectric is sleeved on the radial direction of the second inner conductor. A first outer conductor is sleeved on the outer wall of the first dielectric, and a second outer conductor is sleeved on the outer wall of the second dielectric. The first outer conductor, the second outer conductor, and the third outer conductor are coaxially arranged with the first inner conductor, the second inner conductor, and the elastic bellows. A second outer conductor is intermittently fitted inside the first outer conductor. One end of the second outer conductor contacts the first dielectric, and the other end of the second outer conductor contacts the third outer conductor. The third outer conductor is interference-fitted inside the first outer conductor. In a free state, the second inner conductor protrudes from the end face of the third outer conductor, enabling the second inner conductor to move inward in the axial direction.

[0007] The flexible bellows provides axial elastic force to the interconnect structure, effectively improving axial machining and assembly tolerance, reducing the processing cost of related parts, and improving the assembly efficiency of the interconnect structure. Compared with springs or other elastic components, the flexible bellows can provide an equivalent electrical connection structure, which is more conducive to excellent impedance matching over an ultra-wide frequency range and improves the transmission capability of broadband radio frequency signals. The second outer conductor is assembled inside the first outer conductor with a gap fit to limit the axial displacement of the first dielectric and the first inner conductor, while also providing positioning and limiting functions for the axial displacement of the second dielectric and the second inner conductor. The third outer conductor is inserted into the first outer conductor with an interference fit to limit the axial displacement of the second outer conductor, the first inner conductor, the second inner conductor, the first dielectric, and the second dielectric.

[0008] Furthermore, the first dielectric includes a central hole located at the axial center, with six through holes evenly distributed around its circumference. The first dielectric is positioned between the first inner conductor and the first outer conductor to limit the position of the first inner conductor and, to a certain extent, ensure the concentricity of the first inner and outer conductors. Ensuring the characteristic impedance required for microwave radio frequency transmission is beneficial for improving the transmission capability of microwave radio frequency signals.

[0009] Furthermore, a second dielectric, disposed between the second inner conductor and the second outer conductor, is used to restrict the position of the second inner conductor and, to a certain extent, ensure the concentricity of the second inner conductor and the second outer conductor. This ensures the characteristic impedance required for microwave radio frequency transmission, which is beneficial for improving the transmission capability of microwave radio frequency signals.

[0010] Furthermore, the flexible bellows is made of electroformed nickel, and its outer surface is gold-plated.

[0011] Furthermore, the first inner conductor and the second inner conductor are made of beryllium copper, and the outer surfaces of the first inner conductor and the second inner conductor are gold-plated.

[0012] Furthermore, the first and second media are made of polyetherimide.

[0013] Furthermore, the first, second, and third outer conductors are made of copper, and their outer surfaces are plated with gold.

[0014] Beneficial effects: Compared with the prior art, the advantages of the present invention are as follows: (1) This invention provides a reliable flexible interconnect structure by designing an elastic bellows, a first inner conductor, a second inner conductor, a dielectric, and three outer conductors working together in the interconnect structure. This structure can not only effectively replace the stress and consistency problems caused by welding, thus improving product reliability and consistency, but also provide an excellent solution for situations where welding is not possible in enclosed spaces or small spaces. (2) The present invention uses an elastic bellows to provide the shortest and continuous axial radio frequency signal transmission path, achieves excellent impedance matching in a wide frequency range, has small insertion loss in the passband, has excellent return loss performance, and has strong high frequency signal transmission capability. (3) The present invention has a large tolerance for parts processing and assembly, significantly reduces production costs, and significantly improves product consistency; through experiments, the microwave radio frequency performance of the product is significantly improved. Attached Figure Description

[0015] Figure 1 This is a schematic cross-sectional view of the structure of the present invention; Figure 2 This is a schematic diagram of the structure of the medium in this invention; Figure 3 This is a schematic diagram of the structure of the elastic bellows in this invention; Figure 4 This is a schematic diagram of the assembly of the dielectric, inner conductor, and elastic bellows in Example 1. Figure 5 The waveform diagram shows the radio frequency performance of Example 1; Figure 6 This is a schematic cross-sectional view of the usage state of Example 1. Detailed Implementation

[0016] The technical solution of the present invention will be described in detail below with reference to the accompanying drawings, but the scope of protection of the present invention is not limited to the embodiments described.

[0017] like Figure 1Figure 4 shows a broadband, highly reliable, flexible interconnect structure, including a conductor, a dielectric, and an elastic element. The elastic element is an elastic bellows 1. One end of the elastic bellows 1 is connected to a first inner conductor 2 via a first connecting device, and the other end of the elastic bellows 1 is connected to a second inner conductor 3 via a second connecting device. The first and second connecting devices have identical structures, both having small holes in the cross-section of the first or second inner conductor. The elastic bellows is inserted into the small holes for connection. A first dielectric 4 is fitted radially onto the first inner conductor 2, and the second inner conductor 3 is fitted radially... A second dielectric 5 is sleeved upwards; a first outer conductor 6 is sleeved on the outer wall of the first dielectric 4, and a second outer conductor 7 is sleeved on the outer wall of the second dielectric 5. The first outer conductor 6, the second outer conductor 7, the third outer conductor 8, the first inner conductor 2, the second inner conductor 3, and the elastic bellows 1 are coaxially arranged; the second outer conductor 7 is intermittently fitted inside the first outer conductor 6, one end of the second outer conductor 7 is in contact with the first dielectric 4, and the other end of the second outer conductor 7 is in contact with the third outer conductor 8. The third outer conductor 8 is fitted inside the first outer conductor 6 with an interference fit.

[0018] In this structural configuration, the inner and outer conductors are coaxial. The combination of the first inner conductor 2 and the first dielectric 4 is fixed by the first outer conductor 6 and the second outer conductor 7 and cannot move axially. The combination of the second inner conductor 3 and the second dielectric 5 can move axially within the second outer conductor 7 under the action of external force.

[0019] In a state of freedom, see Figure 1 The second inner conductor 3 protrudes from the end face of the third outer conductor 8; in the working state, see... Figure 6 After assembling the suspension strip 12 with the housing 13, in this embodiment, the first outer conductor 6 is fixedly connected to the housing 13 by fixing screws 11. After installation, the second inner conductor 3 and the suspension strip 12 are tightly fitted together due to axial elastic force. The third outer conductor 8 is tightly fitted to the housing 13 to ensure good grounding of the coaxial structure.

[0020] The first dielectric 4 and the second dielectric 5 include a central hole 9 located at the axial center, and six through holes 10 are evenly distributed around the central hole 9 in the circumferential direction. In this embodiment, the elastic bellows 1 is made of electroformed nickel, and its outer surface is gold-plated. The first inner conductor 2 and the second inner conductor 3 are made of beryllium copper, and their outer surfaces are gold-plated. The first dielectric 4 and the second dielectric 5 are made of polyetherimide. The first outer conductor 6, the second outer conductor 7, and the third outer conductor 8 are made of copper, and their outer surfaces are gold-plated.

[0021] The solution provided in this application embodiment uses a 1.85mm coaxial structure as an example. The characteristic impedance of both the coaxial structure and the suspended strip is 50 ohms. The inner diameter of the outer conductor of the coaxial structure is 1.85mm, and the diameter of the inner conductor is 0.8mm. The outer diameter of the supporting dielectric in the coaxial structure is larger than the inner diameter of the outer conductor, and the central aperture of the supporting dielectric is smaller than the diameter of the inner conductor. In its free state, the second inner conductor protrudes 0.2mm from the end face of the third outer conductor. Experimental verification of its RF performance results is as follows: Figure 5 As shown, the VSWR index is less than 1.1 in the DC~70GHz frequency range, indicating excellent performance.

[0022] As described above, although the invention has been shown and described with reference to specific preferred embodiments, it should not be construed as limiting the invention itself. Various changes in form and detail may be made without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. A broadband, highly reliable, flexible interconnect structure, comprising a conductor, a dielectric, and an elastic element, characterized in that: The elastic element is an elastic bellows (1). One end of the elastic bellows (1) is connected to a first inner conductor (2) through a first connecting device, and the other end of the elastic bellows (1) is connected to a second inner conductor (3) through a second connecting device. A first medium (4) is sleeved on the radial direction of the first inner conductor (2), and a second medium (5) is sleeved on the radial direction of the second inner conductor (3). A first outer conductor (6) is sleeved on the outer wall of the first medium (4), and a second outer conductor (7) is sleeved on the outer wall of the second medium (5). The first outer conductor (6), the second outer conductor (7), and the third outer conductor (8) are coaxially arranged with the first inner conductor (2), the second inner conductor (3), and the elastic bellows. The second outer conductor (7) is intermittently fitted inside the first outer conductor (6). One end of the second outer conductor (7) is in contact with the first medium (4), and the other end of the second outer conductor (7) is in contact with the third outer conductor (8). The third outer conductor (8) is interference-fitted inside the first outer conductor (6). In a free state, the second inner conductor (3) protrudes from the end face of the third outer conductor (8), allowing the combination of the second inner conductor (3) and the second medium 5 to move axially within the second outer conductor (7) under the action of external force. It has the ability to move inward in the axial direction; and after installation, the second inner conductor (3) and the suspension strip (12) are tightly attached due to the axial elastic force of the elastic bellows (1); The first medium (4) includes a central hole (9) located at the axial center position, and six through holes (10) are evenly distributed in the circumferential direction of the central hole (9). The outer diameter of the first medium (4) and the second medium (5) is smaller than the inner diameter of the first outer conductor (6) and the second outer conductor (7) to which they are sleeved, and the diameter of the central hole (9) of the first medium (4) and the second medium (5) is smaller than the diameter of the first inner conductor (2) and the second inner conductor (3).

2. The broadband high-reliability flexible interconnect structure according to claim 1, characterized in that: The material of the elastic corrugated tube (1) is electroformed nickel, and the outer surface of the elastic corrugated tube (1) is gold plated.

3. The broadband high-reliability flexible interconnection structure according to claim 1, characterized in that: The first inner conductor (2) and the second inner conductor (3) are made of beryllium copper, and the outer surfaces of the first inner conductor (2) and the second inner conductor (3) are gold-plated.

4. The broadband high-reliability flexible interconnect structure according to claim 1, characterized in that: The first medium (4) and the second medium (5) are made of polyetherimide.

5. The broadband high-reliability flexible interconnect structure according to claim 1, characterized in that: The first outer conductor (6), the second outer conductor (7) and the third outer conductor (8) are made of copper, and the outer surfaces of the first outer conductor (6), the second outer conductor (7) and the third outer conductor (8) are gold-plated.

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