Connection structure of ridge waveguide and glass bead and microwave device

Abstract

The present invention provides a connection structure between a ridge waveguide and a glass bead and a microwave device, belonging to the field of microwave packaging technology, comprising a ridge waveguide body and a glass bead, wherein the ridge waveguide body comprises a waveguide cavity and a ridge body arranged in the waveguide cavity, wherein the ridge body is provided with a groove; the glass bead comprises a glass bead body and a probe connected to the glass bead body, wherein the probe extends into the groove, and the glass bead is connected to the ridge waveguide by means of the probe. The connection structure between the ridge waveguide and the glass bead provided by the present invention avoids stress deformation and stress damage caused during welding because the probe of the glass bead and the ridge waveguide body do not need to be welded. Since the probe is directly inserted into the groove, the probe can be clamped by utilizing the contraction stress of the groove to achieve a certain elastic contact. When the applied device is working, it can have a certain degree of adjustability to avoid stress damage, thereby making the connection reliable and ensuring the smooth operation of the device.

Description

Technical Field

[0001] The present invention belongs to the technical field of microwave packaging, and more specifically, relates to a connection structure of a ridge waveguide and a glass bead and a microwave device. Background Art

[0002] Waveguide structures are widely used in high-frequency and high-power microwave components, and ridge waveguides are more widely used due to their low insertion loss and wide working bandwidth. Microwave components mostly use microstrip structures, and the connection transformation between them and waveguide structures has always been a research focus. For high-reliability components such as satellite-borne and missile-borne components, the structure must have good airtightness, but the traditional waveguide-to-microstrip structure cannot guarantee the airtightness of the connection, and the connection mostly uses a lead-tin soldering structure, which is prone to overstress damage and has poor reliability. Summary of the invention

[0003] The object of the present invention is to provide a connection structure between a ridge waveguide and a glass bead, aiming to solve the problem that the existing connection method of the ridge waveguide is prone to cause stress damage and has poor reliability.

[0004] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: to provide a connection structure between a ridge waveguide and a glass bead, comprising: a ridge waveguide body and a glass bead, the ridge waveguide body comprising a waveguide cavity and a ridge body arranged in the waveguide cavity, the ridge body being provided with a groove; the glass bead comprising a glass bead body and a probe connected to the glass bead body, the probe extending into the groove, and the glass bead being connected to the ridge waveguide by means of the probe.

[0005] As another embodiment of the present application, the ridge is a stepped structure, including the first step and the second step connected sequentially from top to bottom, the groove is arranged on the first step, there is a gap between the upper surface of the first step and the top wall of the waveguide cavity, and the bottom of the second step is connected to the lower wall of the waveguide cavity.

[0006] As another embodiment of the present application, the ridge body further includes a third step connected below the second step, and the bottom of the third step is connected to the lower wall of the waveguide cavity.

[0007] As another embodiment of the present application, the bottom of the groove is higher than the upper surface of the second step.

[0008] As another embodiment of the present application, the depth of the groove is greater than the diameter of the probe.

[0009] As another embodiment of the present application, a center line of the slot is consistent with a center line of the first step along the step direction.

[0010] As another embodiment of the present application, the distances from both sides of the ridge to adjacent two side walls in the waveguide cavity are equal.

[0011] As another embodiment of the present application, the glass bead body is a cylinder, and the probe passes through the center of the glass bead body.

[0012] As another embodiment of the present application, a plurality of mounting holes are provided on the ridge waveguide body.

[0013] Another object of the present invention is to provide a microwave device, including the connection structure of the ridge waveguide and the glass bead.

[0014] The beneficial effect of the connection structure between the ridge waveguide and the glass bead provided by the present invention is that: compared with the prior art, the connection structure between the ridge waveguide and the glass bead of the present invention has a groove set on the ridge body, and the probe of the glass bead is inserted into the groove, and non-hard contact is achieved by relying on the restoring force of the ridge body itself, thereby reducing the risk of stress damage and achieving reliable connection between the ridge waveguide and the glass bead.

[0015] The connection structure provided by the present invention is applied to microwave devices. Since the glass bead probe and the ridge waveguide body do not need to be welded, stress deformation and stress damage caused during the welding process are avoided. Since the probe is directly inserted into the groove, the contraction stress of the groove can be used to clamp the probe to achieve a certain elastic contact. When the applied device is working, it can have a certain adjustability to avoid stress damage, make the connection reliable, and ensure the smooth operation of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 Schematic diagram of the three-dimensional structure of the connection structure between the ridge waveguide and the glass bead provided in the embodiment of the present invention Figure 1 ;

[0018] Figure 2 Schematic diagram of the three-dimensional structure of the connection structure between the ridge waveguide and the glass bead provided in the embodiment of the present invention Figure 2 ;

[0019] Figure 3 A schematic diagram of the main structure of the connection structure between the ridge waveguide and the glass bead provided in an embodiment of the present invention;

[0020] Figure 4 For along Figure 3 The cross-sectional structure diagram along the AA line;

[0021] Figure 5 for Figure 3 A schematic diagram of the rear view of the connection structure between the ridge waveguide and the glass bead shown;

[0022] Figure 6 A schematic diagram of the three-dimensional structure of a ridge waveguide body provided in an embodiment of the present invention;

[0023] Figure 7 A schematic diagram of the main structure of a ridge waveguide body provided in an embodiment of the present invention;

[0024] Figure 8 For along Figure 7 The cross-sectional structure diagram of the middle BB line;

[0025] Fig. 9 A schematic diagram of the three-dimensional structure of a glass bead provided in an embodiment of the present invention;

[0026] Fig.10 A schematic diagram of the main structure of a glass bead provided in an embodiment of the present invention;

[0027] Fig.11 A structural diagram of the connection between a ridge waveguide and a microwave component equipped with glass beads provided in an embodiment of the present invention.

[0028] In the figure: 1. Ridge waveguide body; 2. Waveguide cavity; 3. Ridge body; 31. First step; 32. Second step; 33. Third step; 34. Groove; 4. Glass bead; 41. Glass bead body; 42. Probe; 5. Mounting hole; 6. Microwave component. DETAILED DESCRIPTION

[0029] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0030] Please also read Figures 1 to 5 Now, the connection structure of the ridge waveguide and the glass bead 4 provided by the present invention is described. The connection structure of the ridge waveguide and the glass bead 4 comprises: a ridge waveguide body 1 and a glass bead 4, wherein the ridge waveguide body 1 comprises a waveguide cavity 2 and a ridge body 3 disposed in the waveguide cavity 2, wherein the ridge body 3 is provided with a groove 34; the glass bead 4 comprises a glass bead body 41 and a probe 42 connected to the glass bead body 41, wherein the probe 42 extends into the groove 34, and the glass bead 4 is connected to the ridge waveguide by means of the probe 42.

[0031] Compared with the prior art, the connection structure between the ridge waveguide and the glass bead provided by the present invention has a groove 34 set on the ridge body 3, and the probe 42 of the glass bead 4 is inserted into the groove 34, and the non-hard contact is achieved by relying on the restoring force of the ridge body 3 structure itself, reducing the risk of stress damage, and thus realizing the reliable connection between the ridge waveguide and the glass bead 4; the microwave component uses the glass bead 4 as a port, which can ensure its own airtightness. The connection structure provided by the present invention has a simple structure and is convenient to connect, and can be promoted in millimeter wave high-power amplifier devices.

[0032] Specifically, since the probe 42 of the glass bead 4 does not need to be welded to the ridge waveguide body 1, stress deformation and stress damage caused during the welding process are avoided. Since the probe 42 is directly inserted into the groove 34, the contraction stress of the groove 34 can be used to clamp the probe 42 to achieve a certain elastic contact. When the applied device is working, it can have a certain degree of adjustability to avoid stress damage, make the connection reliable, and ensure the smooth operation of the device.

[0033] Specifically, see Fig.11 , insert the probe in the microwave component 6 equipped with the glass bead into the slot, and then connect the microwave component to the ridge waveguide body by bolts or screws.

[0034] This embodiment adopts the transition connection between the glass bead 4 and the ridge waveguide to ensure the airtightness of the connection. Among them, in order to ensure reliability, the microwave component must ensure airtightness, and the interior must be evacuated or filled with inert gas. Its external port generally adopts a glass bead structure, the core of which is a gold-plated material of Kovar, which is convenient for bonding, gold-plated belt or welding; the surrounding is a glass medium with good airtightness; the outermost part of the glass medium is a gold-plated material of Kovar, which is convenient for soldering with a gold-plated or silver-plated box body to ensure airtightness. The RF probe is connected to the slot by borrowing its tension elasticity principle. It is not easy to break when vibrating or deforming, and the reliability is greatly improved.

[0035] In this embodiment, the orthographic projection of the ridge body 3 on the lower wall of the waveguide cavity 2 is a rectangular structure, and the waveguide cavity 2 is a rectangular cavity that passes through the ridge waveguide body 1 and is open at both ends, wherein one end of the ridge body 3 is flush with an open end face of the waveguide cavity 2, and the other end of the ridge body 3 does not protrude from the other open end face of the waveguide cavity 2, that is, both ends of the ridge body 3 do not extend out of the waveguide cavity 2.

[0036] In this embodiment, the width of the slot 34 is less than or equal to the diameter of the probe 42 to ensure good contact between the probe 42 and the slot 34. The shrinkage stress of the slot structure is used to tighten the glass bead 4 conductor to achieve a final non-hard connection and improve reliability.

[0037] In this embodiment, see Figure 4 and Figure 7The ridge body 3 and the ridge waveguide body 1 are an integrated structure, and the whole is made of metal material and is manufactured by integrated processing. The slot 34 is made by wire cutting. In this embodiment, the cross-sectional shape of the slot is a rectangular structure.

[0038] As a specific implementation of the embodiment of the present invention, please refer to Figure 4 and Figure 7 The ridge 3 is a stepped structure, including the first step 31 and the second step 32 connected sequentially from top to bottom, the slot 34 is arranged on the first step 31, there is a gap between the upper surface of the first step 31 and the top wall of the waveguide cavity 2, and the bottom of the second step 32 is connected to the lower wall of the waveguide cavity 2. This embodiment can improve the working bandwidth of the switching circuit through stepped matching.

[0039] In the prior art, glass beads are generally round or curved. Since the microwave assembly used in the present application is a box body, the glass beads need to be inserted into the slots of the box body for welding. In machining, round or oval shapes are the least difficult and the lowest cost.

[0040] The RF connection of microwave components is generally coaxial cable or microstrip line. Glass beads can be connected to coaxial cables using SMA connectors or directly coated with gold strips or welded to microstrip lines.

[0041] Waveguide is a high-frequency transmission structure that uses microwave signals to reflect back and forth in an air cavity to achieve transmission, similar to optical fiber. In order to achieve the connection between the glass bead and the waveguide, a connection conversion must be performed. The ridge waveguide is a transformation structure that uses a stepped structure to gradually convert the impedance of the waveguide to the RF impedance of the glass bead. It has the characteristics of wide bandwidth and low insertion loss. This structure is mostly a discrete structure, which is machined separately and assembled with screws for the airtight module using a glass bead structure. Traditional probe connections are generally smeared with solder paste first, and after the screws connect the waveguide and the microwave component, the connection is subjected to high-temperature treatment. After the solder paste melts, it cools down and condenses to achieve a good connection. However, the reliability of this structure is too low. The screw fixation itself has a tendency to move. In addition, the expansion coefficients of the probe and waveguide materials are different. It is easy for the probe and the ridge to move relative to each other, which will damage the probe or even the glass bead vitreous body.

[0042] By adopting the slotted structure, the ridge waveguide and the probe can be equivalent to a soft connection, similar to a spring that can be displaced to a large extent without being strained, thus achieving connection reliability.

[0043] This embodiment adopts a stepped ridge waveguide, which can effectively complete the conversion from microstrip line to waveguide, and is simple to process and easy to assemble. It has good microwave characteristics, low loss, good standing wave, and can improve the airtightness of microwave components when combined with glass bead connection.

[0044] As a specific implementation of the embodiment of the present invention, please refer to Figure 4 and Figure 7 The ridge 3 further includes a third step 33 connected to the lower part of the second step 32, and the bottom of the third step 33 is connected to the lower wall of the waveguide cavity 2. The number of steps provided is determined according to specific needs. The steps provided in this embodiment are only for the convenience of description and do not constitute a limitation to the present application. For example, there may be four or more steps, and the length and width of each step are not limited.

[0045] As a specific implementation of the embodiment of the present invention, refer to Figure 4 and Figure 7 , the bottom of the slot 34 is higher than the upper surface of the second step 32. The bottom of the slot 34 is higher than the upper surface of the second step 32, which can prevent the probe 42 passing through the slot 34 from contacting the second step 32. Of course, in the drawings given in this embodiment, the probe 42 does not extend out of the slot 34.

[0046] In this embodiment, there is no restriction on the number of steps of the ridge 3 , and there is no restriction on the height and width of each step, wherein the width direction of the ridge 3 is based on the direction of the left and right side walls of the waveguide cavity 2 .

[0047] As a specific implementation of the embodiment of the present invention, please refer to Figure 4 , the depth of the groove 34 is greater than the diameter of the probe 42. In this embodiment, the probe 42 can be completely sunk into the groove 34 to prevent the probe 42 from being exposed outside the groove 34. Herein, the depth direction of the groove 34 is based on the upper and lower wall directions of the waveguide cavity 2.

[0048] As a specific implementation of the embodiment of the present invention, please refer to Figure 4 , the center line of the slot 34 is consistent with the center line of the first step 31 along the step direction.

[0049] As a specific implementation of the embodiment of the present invention, please refer to Figure 3 , the distances between the two sides of the ridge 3 and the adjacent two side walls in the waveguide cavity 2 are equal. In this embodiment, the ridge is located in the middle of the waveguide cavity. Of course, the distances between the two sides of the ridge and the adjacent two side walls in the waveguide cavity may also be unequal. It depends on the actual design situation.

[0050] As a specific implementation of the embodiment of the present invention, please refer to Figures 9 and 10, the glass bead body 41 is a cylinder, and the probe 42 passes through the center of the glass bead body 41. The diameter of the glass bead body 41 is greater than the width of the ridge 3, and the width direction of the ridge 3 is based on the direction of the left and right side walls of the waveguide cavity 2. In this embodiment, the diameter and length of the glass bead body are not limited, and the diameter and length of the probe are selected according to the length and width of the slot, or the width and length of the slot are determined according to the diameter and length of the selected probe.

[0051] As a specific implementation of the embodiment of the present invention, please refer to Figures 1 to 8 The ridge waveguide body 1 is provided with a plurality of mounting holes 5. The ridge waveguide body 1 can be interconnected with other components by screws or bolts passing through the mounting holes 5. In this embodiment, straight holes and stepped holes are provided. The stepped holes can hide the nuts of the screws or bolts in the holes, reduce the space occupied by the screws or bolts, improve the visibility of the appearance, and prevent the exposed nuts from affecting other components.

[0052] In this embodiment, see Figure 1 , Figure 2 and Figure 6 The ridge waveguide body 1 is a convex structure. For ease of understanding and description, the ridge waveguide body 1 in this article includes a base plate and a boss, wherein the stepped hole is arranged on the boss, which can shorten the length of the bolt used and is also conducive to hiding the nut in the stepped hole.

[0053] The present invention also provides a microwave device, comprising the connection structure of the ridge waveguide and the glass bead.

[0054] In this embodiment, the working bandwidth of the switching circuit can be improved through step matching; by setting the slot 34, the probe 42 is inserted into the slot 34 to ensure good contact between the two; the microwave device uses a glass bead as a port to ensure its own airtightness, and is interconnected with the ridge waveguide body 1 through screws, and the shrinkage stress of the slot 34 is used to clamp the glass bead conductor to achieve a final non-hard connection and improve the connection reliability.

[0055] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A connection structure between a ridge waveguide and a glass bead, characterized in that: include: A ridge waveguide body, comprising a waveguide cavity and a ridge body arranged in the waveguide cavity, wherein the ridge body is provided with a groove; and A glass bead comprises a glass bead body and a probe connected to the glass bead body, wherein the probe extends into the groove, and the glass bead is connected to the ridge waveguide by means of the probe; the depth of the groove is greater than the diameter of the probe; The ridge is a stepped structure, including a first step and a second step connected in sequence from top to bottom, the groove is arranged on the first step, there is a gap between the upper surface of the first step and the top wall of the waveguide cavity, and the bottom of the second step is connected to the lower wall of the waveguide cavity; The ridge body further includes a third step connected below the second step, and the bottom of the third step is connected to the lower wall of the waveguide cavity.

2. The connection structure of the ridge waveguide and the glass bead according to claim 1, characterized in that: The bottom of the groove is higher than the upper surface of the second step.

3. The connection structure of ridge waveguide and glass bead as claimed in claim 1, characterized in that: The center line of the slot is consistent with the center line of the first step along the step direction.

4. The connection structure of ridge waveguide and glass bead as claimed in claim 1, characterized in that: The distances between the two sides of the ridge and the adjacent two side walls in the waveguide cavity are equal.

5. The connection structure of ridge waveguide and glass bead as claimed in claim 1, characterized in that: The glass bead body is a cylinder, and the probe passes through the center of the glass bead body.

6. The connection structure of ridge waveguide and glass bead as claimed in claim 1, characterized in that: The ridge waveguide body is provided with a plurality of mounting holes.

7. A microwave device, characterized in that It comprises a connection structure between a ridge waveguide and a glass bead as described in any one of claims 1 to 6.

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