A coaxial-waveguide conversion structure and power combining device

Abstract

The utility model relates to the technical field of electromagnetic wave transmission, especially a coaxial-waveguide conversion structure and power synthesis device, the coaxial-waveguide conversion structure includes waveguide and coaxial, the waveguide includes closed end and open end, the coaxial includes outer conductor and inner conductor, the outer conductor is connected with the broadside of waveguide, the inner conductor passes through the broadside of waveguide and then stretches into the waveguide, the distance between the coaxial to the inner wall of closed end is 1 / 4 of the wavelength of electromagnetic wave, provide a kind of simple structure, weight is lighter, easy to assemble, the manufacturing cost is lower, and the electromagnetic performance is better coaxial-waveguide conversion structure, the power synthesis device uses the coaxial-waveguide conversion structure.

Description

Technical Field

[0001] This utility model relates to the field of electromagnetic wave transmission technology, and in particular to a coaxial-waveguide conversion structure and power combining device. Background Technology

[0002] A coaxial conductor is a broadband microwave transmission system consisting of two coaxial cylindrical conductors, with air or a high-frequency dielectric filling the space between the inner and outer conductors.

[0003] A waveguide is a hollow, smooth-walled metal conduit or tube lined with metal, used to transmit ultra-high frequency electromagnetic waves. Through it, pulse signals can be transmitted to their destination with minimal loss.

[0004] A power combining device is a device that combines the energy of N input signals into the energy of M output signals (where N≥2 and N>M); the reverse of the power combining device is a power distribution device.

[0005] During electromagnetic wave transmission, it is often necessary to switch between coaxial and waveguide. Existing coaxial-waveguide conversion structures are complex, heavy, and inconvenient to manufacture, which limits their application prospects. Utility Model Content

[0006] The purpose of this invention is to provide a coaxial-waveguide conversion structure to solve at least one of the technical problems in the prior art.

[0007] Another objective of this invention is to provide a power combining device that employs the aforementioned coaxial-waveguide conversion structure.

[0008] The objective of this utility model is achieved through the following technical solution:

[0009] A coaxial-to-waveguide conversion structure includes a waveguide and a coaxial cable. The waveguide includes a closed end and an open end. The coaxial cable includes an outer conductor and an inner conductor. The outer conductor is connected to the wide side of the waveguide. The inner conductor passes through the wide side of the waveguide and extends into the waveguide. The distance between the coaxial cable and the inner wall of the closed end is 1 / 4 of the wavelength of the electromagnetic wave.

[0010] Furthermore, the distance between the inner walls of the two wide sides of the waveguide is D1, and the length of the inner conductor extending into the waveguide is L1, wherein L1 ∈ [D1 / 4, D1 / 2].

[0011] Furthermore, the coaxial cable is positioned on the centerline of the wide side of the waveguide.

[0012] Furthermore, the end of the inner conductor extending into the waveguide is mushroom-shaped.

[0013] Furthermore, the coaxial arrangement is located on both sides of the centerline of the wide side of the waveguide.

[0014] Furthermore, a dielectric sleeve is fitted onto the inner conductor extending into the waveguide, the length of which is L2, and L2 = D1.

[0015] Furthermore, the dielectric sleeve is made of an insulating material.

[0016] Furthermore, the distance between the inner walls of the two narrow sides of the waveguide is D2, and the distance between the coaxial line and the center line is D3, where D3 ∈ (0, 3D2 / 8).

[0017] A power combining device, the power combining device including the coaxial-waveguide conversion structure.

[0018] This utility model has the following advantages:

[0019] The coaxial-to-waveguide conversion structure of this invention eliminates the need for a matching block. By simply passing the inner conductor of the coaxial cable through the wide side of the waveguide and extending it into the waveguide, the conversion between coaxial and waveguide can be achieved. Therefore, there is no need to process and manufacture a complex matching block, and the assembly process of connecting the matching block to the inner wall of the waveguide and the inner conductor is also eliminated. Its structure is simple, lightweight, easy to assemble, has low manufacturing cost, and good electromagnetic performance, making it suitable for widespread use. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0021] Figure 1 This is a cross-sectional schematic diagram of an existing coaxial-waveguide conversion structure;

[0022] Figure 2 This is a schematic diagram of the structure of Embodiment 1 of the coaxial-waveguide conversion structure of this utility model;

[0023] Figure 3 for Figure 2 Diagram of the AA section;

[0024] Figure 4 for Figure 2 Schematic diagram of the cross section of the middle BB;

[0025] Figure 5 This is a schematic diagram of the structure of Embodiment 2 of the coaxial-waveguide conversion structure of this utility model;

[0026] Figure 6 for Figure 5 Diagram of CC or DD section cut;

[0027] Figure 7 for Figure 5 Schematic diagram of the cross section of the EE;

[0028] Figure 8 This is a schematic diagram of the power combining device structure of Embodiment 1 of the coaxial-waveguide conversion structure of this utility model;

[0029] Figure 9 The schematic diagram shows the power combining device structure of Embodiment 2 of this utility model, which utilizes the coaxial-waveguide conversion structure. Figure 1 ;

[0030] Figure 10 The schematic diagram shows the power combining device structure of Embodiment 2 of this utility model, which utilizes the coaxial-waveguide conversion structure. Figure 2 ;

[0031] Figure 11 This is a simulation curve of Embodiment 1 of the coaxial-waveguide conversion structure of this utility model;

[0032] Figure 12 This is a simulation curve of Embodiment 2 of the coaxial-waveguide conversion structure of this utility model;

[0033] Figure 13 Simulation curves of the power combining device of this utility model Figure 1 ;

[0034] Figure 14 Simulation curves of the power combining device of this utility model Figure 2 ;

[0035] In the diagram: 1-waveguide; 2-coaxial; 3-closed end; 4-open end; 5-outer conductor; 6-inner conductor; 7-dielectric sleeve; 8-centerline; 9-matching block. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0037] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0038] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0039] In this invention, unless otherwise expressly specified and limited, "above or below" the first feature may include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on" the first feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the first feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0040] See Figures 2 to 7 As shown, a coaxial-waveguide conversion structure includes a waveguide 1 and a coaxial cable 2. The waveguide 1 includes a closed end 3 and an open end 4. The coaxial cable 2 is disposed near the closed end 3. The coaxial cable 2 includes an outer conductor 5 and an inner conductor 6. The outer conductor 5 and the inner conductor 6 are spaced apart and coaxially arranged. The outer conductor 5 is connected to the wide side of the waveguide 1. The inner conductor 6 extends through the wide side of the waveguide 1 and is suspended inside the waveguide 1, i.e., the inner conductor 6 extending into the waveguide 1 does not contact the inner wall of the waveguide 1. The distance between the coaxial cable 2 and the inner wall of the closed end 3 is 1 / 4 of the electromagnetic wave wavelength λ. In some embodiments, a dielectric layer is further disposed between the outer conductor 5 and the inner conductor 6, which can fix the inner conductor 6 inside the outer conductor 5. The prior art coaxial-waveguide conversion structure (see...) Figure 1The previous method required a matching block 9 inside waveguide 1. The matching block 9 has a complex structure and is heavy, resulting in a large coaxial-to-waveguide conversion structure. Furthermore, the matching block 9 needs to be connected to the inner wall of waveguide 1 and the inner conductor 6, leading to a complicated assembly process and increased manufacturing costs. The coaxial-to-waveguide conversion structure of this invention eliminates the need for a matching block 9. The inner conductor 6 of the coaxial 2 passes through the wide side of waveguide 1 and extends into waveguide 1, achieving coaxial-to-waveguide conversion. Therefore, it eliminates the need to fabricate the complex matching block 9 and avoids the assembly process of connecting the matching block 9 to the inner wall of waveguide 1 and the inner conductor 6. This makes the coaxial-to-waveguide conversion structure of this invention simpler, lighter, easier to assemble, and lower in manufacturing cost. Moreover, the coaxial-to-waveguide conversion structure of this invention has better electromagnetic performance. Figure 11 and Figure 12 .

[0041] Further details can be found here. Figures 2 to 7 As shown, the distance between the two wide inner walls of the waveguide 1 is D1, and the length of the inner conductor 6 extending into the waveguide 1 is L1. In order to minimize the reflection of electromagnetic waves, L1 ∈ [D1 / 4, D1 / 2].

[0042] Further details can be found here. Figures 2 to 4 As shown, in order to obtain a stronger electric field, the coaxial cable 2 is set on the center line 8 of the wide side of the waveguide 1, that is, the center of the coaxial cable 2 falls on the center line 8 of the wide side of the waveguide 1.

[0043] Further details can be found here. Figures 2 to 4 As shown, the end of the inner conductor 6 extending into the waveguide 1 is mushroom-shaped; specifically, the end of the inner conductor 6 extending into the waveguide 1 is provided with a step protruding from the inner conductor 6, making the inner conductor 6 an inverted "T" shape (to... Figure 3 (For reference), namely the mushroom head shape, which can reduce reflection and increase bandwidth.

[0044] Further details can be found here. Figures 5 to 7 As shown, in order to extend the bandwidth and / or facilitate power combining, the coaxial cable 2 is disposed on both sides of the center line 8 of the wide side of the waveguide 1; in this embodiment, there are two coaxial cables 2, which are respectively disposed on both sides of the center line 8 of the wide side of the waveguide 1.

[0045] Further details can be found here. Figures 5 to 7As shown, a dielectric sleeve 7 is fitted onto the inner conductor 6 extending into the waveguide 1. The length of the dielectric sleeve 7 is L2, where L2 = D1. The dielectric sleeve 7 can reduce the radiation resistance of the inner conductor 6 extending into the waveguide 1, enabling better broadband matching between it and the waveguide 1. It can also provide support and positioning for the inner conductor 6. Furthermore, the length of the dielectric sleeve 7 is equal to the distance between the inner walls of the two wide sides of the waveguide 1, which means maximizing the length of the dielectric sleeve 7 and thus maximizing the widening of the operating frequency band of the coaxial-waveguide conversion structure.

[0046] Furthermore, increasing the dielectric constant of the dielectric sleeve 7 can concentrate the electric field, thereby reducing the loss of the electric field. Therefore, the dielectric sleeve 7 is made of insulating material, such as quartz glass, ceramic, polytetrafluoroethylene, etc.

[0047] Further, see Figures 5 to 7 As shown, the distance between the inner walls of the two narrow sides of the waveguide 1 is D2, and the distance between the coaxial line 2 and the center line 8 is D3. In order to minimize the reflection of electromagnetic waves, D3∈0, 3D2 / 8].

[0048] A power combining device, the power combining device including the coaxial-waveguide conversion structure; specifically, such as Figure 8 As shown, at least two coaxial-waveguide conversion structures described in Embodiment 1, connected in parallel via waveguides, constitute a power combining device; and so on. Figure 9 As shown, one coaxial-waveguide conversion structure as described in Embodiment 2 can be directly used as a power combining device; alternatively, at least two coaxial-waveguide conversion structures as described in Embodiment 2 can be connected in parallel via waveguides to form a power combining device with greater power, such as... Figure 10 As shown; in summary and in combination Figure 13 and Figure 14 It is known that the power combining device of this utility model has a simple structure, light weight, is easy to assemble, has low manufacturing cost, good electromagnetic performance, and has broad application prospects.

[0049] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A coaxial-waveguide conversion structure, comprising a waveguide (1) and a coaxial cable (2), wherein the waveguide (1) comprises a closed end (3) and an open end (4), and the coaxial cable (2) comprises an outer conductor (5) and an inner conductor (6), characterized in that: The outer conductor (5) is connected to the wide side of the waveguide (1), the inner conductor (6) passes through the wide side of the waveguide (1) and extends into the waveguide (1), and the distance between the coaxial (2) and the inner wall of the closed end (3) is 1 / 4 of the wavelength of the electromagnetic wave.

2. The coaxial-waveguide conversion structure according to claim 1, characterized in that: The distance between the two wide inner walls of the waveguide (1) is D1, and the length of the inner conductor (6) extending into the waveguide (1) is L1, where L1 ∈ [D1 / 4, D1 / 2].

3. The coaxial-waveguide conversion structure according to any one of claims 1 or 2, characterized in that: The coaxial (2) is positioned on the centerline (8) of the wide side of the waveguide (1).

4. The coaxial-waveguide conversion structure according to claim 3, characterized in that: The end of the inner conductor (6) extending into the waveguide (1) is mushroom-shaped.

5. The coaxial-waveguide conversion structure according to any one of claims 1 or 2, characterized in that: The coaxial (2) is arranged on both sides of the center line (8) of the wide side of the waveguide (1).

6. The coaxial-waveguide conversion structure according to claim 5, characterized in that: A dielectric sleeve (7) is fitted on the inner conductor (6) that extends into the waveguide (1), and the length of the dielectric sleeve (7) is L2, where L2 = D1.

7. The coaxial-waveguide conversion structure according to claim 6, characterized in that: The dielectric sleeve (7) is made of insulating material.

8. The coaxial-waveguide conversion structure according to claim 7, characterized in that: The distance between the inner walls of the two narrow sides of the waveguide (1) is D2, and the distance between the coaxial line (2) and the center line (8) is D3, where D3 ∈ (0, 3D2 / 8).

9. A power combining device, characterized in that: The power combining device includes the coaxial-waveguide conversion structure as described in any one of claims 1 to 8.

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