阅读说明：本技术 一种波导同轴转换器 (Waveguide coaxial converter ) 是由 朱柯斌 王建国 于 2020-06-17 设计创作，主要内容包括：本发明公开了一种波导同轴转换器,属于波导同轴转换设备技术领域。其包括：波导本体,上侧为上波导宽边,下侧为下波导宽边,左右两侧为左波导窄边和右波导窄边,前侧为波导端面,后侧敞口形成波导端口,波导本体内形成波导腔体；阻抗匹配块,位于波导腔体内且其前端面与波导端面的内侧壁之间形成间隙一,阻抗匹配块连接在下波导宽边上,阻抗匹配块、波导端面与下波导宽边一体连接或一体加工形成；同轴接头,安装在波导端面上,同轴接头包括同轴内导体,波导端面上设有通孔,同轴内导体的一端穿过通孔并与阻抗匹配块连接,同轴内导体上设有与波导端面的内侧壁之间形成间隙二的匹配凸部。本发明的波导同轴转换器能够克服装配误差且提高驻波性能。(The invention discloses a waveguide coaxial converter, and belongs to the technical field of waveguide coaxial conversion equipment. It includes: the waveguide comprises a waveguide body, wherein the upper side is an upper waveguide wide edge, the lower side is a lower waveguide wide edge, the left side and the right side are a left waveguide narrow edge and a right waveguide narrow edge, the front side is a waveguide end face, the rear side is opened to form a waveguide port, and a waveguide cavity is formed in the waveguide body; the impedance matching block is positioned in the waveguide cavity, a first gap is formed between the front end face of the impedance matching block and the inner side wall of the waveguide end face, the impedance matching block is connected to the wide edge of the lower waveguide, and the impedance matching block, the waveguide end face and the wide edge of the lower waveguide are integrally connected or integrally processed; the coaxial connector is arranged on the waveguide end face and comprises a coaxial inner conductor, a through hole is formed in the waveguide end face, one end of the coaxial inner conductor penetrates through the through hole and is connected with the impedance matching block, and a matching convex portion forming a second gap with the inner side wall of the waveguide end face is arranged on the coaxial inner conductor. The waveguide coaxial converter can overcome assembly errors and improve standing wave performance.)

1. A waveguide coaxial transducer, comprising:

the waveguide comprises a waveguide body, wherein the upper side of the waveguide body is an upper waveguide wide edge, the lower side of the waveguide body is a lower waveguide wide edge, the left sides of the upper waveguide wide edge and the lower waveguide wide edge are connected with a left waveguide narrow edge, the right sides of the upper waveguide wide edge and the lower waveguide wide edge are connected with a right waveguide narrow edge, the left waveguide narrow edge and the right waveguide narrow edge are both positioned between the upper waveguide wide edge and the lower waveguide wide edge, the front side of the waveguide body is provided with a waveguide end face connected with the front end faces of the upper waveguide wide edge, the lower waveguide wide edge, the left waveguide narrow edge and the right waveguide narrow edge, the rear side of the waveguide body is opened to form a waveguide port, and a waveguide cavity is defined between the upper waveguide wide edge, the lower waveguide wide edge, the left waveguide narrow edge, the right waveguide narrow edge and the waveguide end face;

the impedance matching block is positioned in the waveguide cavity, a first gap is formed between the front end face of the impedance matching block and the inner side wall of the waveguide end face, the impedance matching block is connected to the wide edge of the lower waveguide, and the impedance matching block, the waveguide end face and the wide edge of the lower waveguide are integrally connected or integrally processed;

the coaxial connector is installed on the outer side face of the waveguide end face and comprises a coaxial inner conductor, a through hole communicated with the waveguide cavity is formed in the waveguide end face, one end of the coaxial inner conductor penetrates through the through hole and is connected with the impedance matching block, a matching convex portion is arranged at one end, connected with the impedance matching block, of the coaxial inner conductor and can be attached to the end face of the impedance matching block to serve as a part of the impedance matching block, a gap II is formed between the front end face of the matching convex portion and the inner side wall of the waveguide end face, and the other end of the coaxial inner conductor is located in the coaxial connector.

2. The waveguide coaxial converter of claim 1, wherein the coaxial inner conductor further comprises:

the connecting part is used for being connected with the impedance matching block, is connected to one end of the impedance matching block and is inserted into the impedance matching block, the matching convex part is connected to the front part of the connecting part and protrudes to the peripheral side of the connecting part, and the matching convex part passes through the through hole and can be attached to the end face of the impedance matching block;

a coaxial portion connected to a front portion of the mating protrusion and located within the coaxial connector.

3. The waveguide coaxial converter of claim 1, wherein the gap one has a dimension greater than 2 mm.

4. The waveguide coaxial converter of claim 1, wherein the waveguide cavity is of a rectangular configuration.

5. The waveguide coaxial converter according to claim 1, wherein the upper waveguide wide side, the lower waveguide wide side, the left waveguide narrow side, the right waveguide narrow side and the impedance matching block are integrally connected or formed by integral processing, and the upper waveguide wide side is assembled on the upper ends of the left waveguide narrow side and the right waveguide narrow side.

6. The waveguide coaxial converter according to claim 1, wherein the impedance matching block is provided with a mounting hole, the mounting hole and the through hole are located on the same axis, and the connecting portion is connected to the mounting hole in an adaptive manner.

7. The waveguide coaxial converter according to claim 6, wherein the mounting hole is a threaded hole, the connecting portion is provided with an external thread, and the connecting portion is in threaded connection with the threaded hole.

8. The waveguide coaxial converter according to claim 6 or 7, wherein the impedance matching block is connected to the lower waveguide broad edge, a fastening hole is arranged on the lower waveguide broad edge corresponding to the mounting hole, the fastening hole penetrates through the lower waveguide broad edge and extends into the impedance matching block to be communicated with the mounting hole, and an adhesive is filled in the fastening hole to fix the connecting part in the mounting hole; or a locking piece used for locking the connecting part in the mounting hole is arranged in the fastening hole.

9. The waveguide coaxial converter according to claim 6 or 7, wherein the impedance matching block includes a plurality of steps, and the mounting hole is opened on a front side of the step at the top.

10. The waveguide coaxial transducer according to any one of claims 1 to 7, wherein a flange is attached to one end of the waveguide port, the flange being brazed to the one end of the waveguide port.

Technical Field

The invention relates to the technical field of waveguide coaxial conversion equipment, in particular to a waveguide coaxial converter.

Background

The waveguide coaxial converter is widely applied to equipment such as radars and communication equipment, and realizes low-loss transition of microwave signals from a waveguide system to a coaxial system or from the coaxial system to the waveguide system. At present, the structure of the existing waveguide coaxial converter is shown in fig. 1, a matching block 7 is installed in a waveguide cavity in a waveguide 6, and then the matching block 7 is connected with a matching pin 9, the matching block 7 is usually processed first, and then the matching block 7 is fixed in the waveguide cavity through a screw 8, in order to ensure the standing wave performance of the waveguide coaxial converter and avoid short circuit, the gap formed between the matching block 7 and the front inner wall of the waveguide cavity is usually 0.2-2.0 mm, the gap extends to the bottom of the waveguide cavity, and the depth of the gap is about 8-40 mm. In addition, although the matching block 7 is independently processed, the processing precision of the matching block 7 can be ensured, when the matching block 7 is assembled in the waveguide cavity, assembly errors exist and are difficult to avoid, so that the standing wave index of the waveguide coaxial converter is poor, generally, the difference is 0.1mm in the horizontal direction of a C wave band, the influence of the standing wave is about 0.05-0.15, the higher the frequency is, the more obvious the frequency is, and even if the mounting position of the matching block 7 is debugged and adjusted for many times, the better standing wave index is difficult to achieve, and the debugging needs more time and energy. Thus, there is a need for a waveguide coaxial converter that can overcome assembly errors and improve standing wave performance.

Disclosure of Invention

The present invention is directed to overcoming at least one of the deficiencies of the prior art described above and providing a waveguide coaxial converter that overcomes assembly errors and improves standing wave performance.

The technical scheme for solving the technical problems is as follows: a waveguide coaxial converter comprising:

the waveguide comprises a waveguide body, wherein the upper side of the waveguide body is an upper waveguide wide edge, the lower side of the waveguide body is a lower waveguide wide edge, the left sides of the upper waveguide wide edge and the lower waveguide wide edge are connected with a left waveguide narrow edge, the right sides of the upper waveguide wide edge and the lower waveguide wide edge are connected with a right waveguide narrow edge, the left waveguide narrow edge and the right waveguide narrow edge are both positioned between the upper waveguide wide edge and the lower waveguide wide edge, the front side of the waveguide body is provided with a waveguide end face connected with the front end faces of the upper waveguide wide edge, the lower waveguide wide edge, the left waveguide narrow edge and the right waveguide narrow edge, the rear side of the waveguide body is opened to form a waveguide port, and a waveguide cavity is defined between the upper waveguide wide edge, the lower waveguide wide edge, the left waveguide narrow edge, the right waveguide narrow edge and the waveguide end face;

the impedance matching block is positioned in the waveguide cavity, a first gap is formed between the front end face of the impedance matching block and the inner side wall of the waveguide end face, the impedance matching block is connected to the wide edge of the lower waveguide, and the impedance matching block, the waveguide end face and the wide edge of the lower waveguide are integrally connected or integrally processed;

the coaxial connector is installed on the outer side face of the waveguide end face and comprises a coaxial inner conductor, a through hole communicated with the waveguide cavity is formed in the waveguide end face, one end of the coaxial inner conductor penetrates through the through hole and is connected with the impedance matching block, a matching convex portion is arranged at one end, connected with the impedance matching block, of the coaxial inner conductor and can be attached to the end face of the impedance matching block to serve as a part of the impedance matching block, a gap II is formed between the front end face of the matching convex portion and the inner side wall of the waveguide end face, and the other end of the coaxial inner conductor is located in the coaxial connector.

The invention has the beneficial effects that: according to the invention, a first gap is formed between the front end face of the impedance matching block and the inner side wall of the waveguide end face, the impedance matching block is connected to the lower waveguide wide edge, and the impedance matching block, the waveguide end face and the lower waveguide wide edge are integrally connected or integrally processed, so that the impedance matching block and the lower waveguide wide edge are integrally connected, the position precision of the processed impedance matching block is determined by the processing precision, and the impedance matching block does not need to be assembled on the lower waveguide wide edge, thereby avoiding the influence of assembly errors caused by the assembly of the impedance matching block on the lower waveguide wide edge on the standing wave performance of the waveguide coaxial converter, and avoiding the inconvenience of debugging and the installation position of the impedance matching block. And the position relation between the waveguide end face and the impedance matching block is determined by the processing precision, and the relative position between the through hole on the waveguide end face and the impedance matching block is determined, so that the installation precision of the coaxial inner conductor is improved, the connection precision of the coaxial inner conductor and the impedance matching block is improved, and the standing wave performance of the waveguide coaxial converter is improved. Furthermore, the matching convex part is attached to the end face of the impedance matching block, the matching convex part is used as a part of the impedance matching block, namely the length of the impedance matching block is extended to one side of the waveguide end face, the matching convex part fills a part of the gap I, and the distance between the waveguide end face and the end face of the matching block is small, so that the standing wave performance realized by matching the matching convex part and the impedance matching block is ensured. Therefore, the waveguide coaxial converter can overcome assembly errors and improve standing wave performance.

In addition, on the basis of the above technical solution, the present invention may be further improved as follows, and may further have the following additional technical features.

According to an embodiment of the invention, the coaxial inner conductor further comprises:

the connecting part is used for being connected with the impedance matching block, is connected to one end of the impedance matching block and is inserted into the impedance matching block, the matching convex part is connected to the front part of the connecting part and protrudes to the peripheral side of the connecting part, and the matching convex part passes through the through hole and can be attached to the end face of the impedance matching block;

a coaxial portion connected to a front portion of the mating protrusion and located within the coaxial connector.

The matching convex part in this embodiment is connected the front portion of connecting portion just to week side protrusion connecting portion, and the matching convex part passes the through-hole just can paste and tightly cooperate on the terminal surface of impedance matching block the impedance matching block realizes transition matching, in addition, inserts connecting portion in the impedance matching block and is connected with the impedance matching block, is convenient for match the convex part and pastes tightly on the terminal surface of impedance matching block.

According to one embodiment of the invention, the first gap has a dimension greater than 2 mm. The size of the first gap in the embodiment is larger than 2mm, the first gap can be milled conveniently through a milling cutter, the processing difficulty is reduced, and the impedance matching block can be processed and formed in the waveguide cavity conveniently.

According to one embodiment of the invention, the waveguide cavity is rectangular in configuration. The waveguide cavity in the embodiment is of a rectangular structure, so that the impedance matching block can be conveniently processed and formed in the waveguide cavity.

According to one embodiment of the invention, the upper waveguide wide side, the lower waveguide wide side, the left waveguide narrow side, the right waveguide narrow side and the impedance matching block are integrally connected or integrally processed, and the upper waveguide wide side is assembled on the upper ends of the left waveguide narrow side and the right waveguide narrow side. In this embodiment, the upper waveguide wide side, the lower waveguide wide side, the left waveguide narrow side, the right waveguide narrow side and the impedance matching block are integrally connected or integrally processed, and the upper waveguide wide side is assembled at the upper ends of the left waveguide narrow side and the right waveguide narrow side, which is beneficial to reducing the processing difficulty and is convenient for processing to form the waveguide body.

According to one embodiment of the invention, the upper waveguide broadside is brazed to the upper ends of the left and right waveguide narrow sides. In the embodiment, the wide edge of the upper waveguide is connected to the upper ends of the narrow edge of the left waveguide and the narrow edge of the right waveguide through brazing, so that the reliability of the connection of the wide edge of the upper waveguide is improved.

According to one embodiment of the invention, the impedance matching block is provided with a mounting hole, the mounting hole and the through hole are positioned on the same axis, and the connecting part is connected with the mounting hole in a matching manner. In this embodiment, the impedance matching block is provided with the mounting hole, and the connecting portion is connected to the mounting hole in a fitting manner, so that the matching protrusion on the inner axial guide body is stopped at the end face of the impedance matching block, and the matching protrusion and the impedance matching block realize a matching function together. In addition, the mounting hole and the through hole in this embodiment are located on the same axis, so that the coaxial inner conductor can conveniently pass through the through hole and the axis of the coaxial inner conductor is overlapped with the center of the through hole, so that when the coaxial connector is mounted on the waveguide end face, the axis of the coaxial inner conductor is located on the central line of the coaxial connector.

According to one embodiment of the invention, the mounting hole is a threaded hole, the connecting part is provided with an external thread, and the connecting part is in threaded connection with the threaded hole in a matching manner. The mounting hole in this embodiment is the screw hole, is equipped with the external screw thread on the connecting portion, is convenient for with connecting portion and mounting hole threaded connection, and screws up coaxial inner conductor, can end the matching convex part on the coaxial inner conductor on the waveguide terminal surface for matching convex part and impedance matching piece realize the mating action jointly.

According to one embodiment of the invention, the impedance matching block is connected to the wide edge of the lower waveguide, a fastening hole is arranged on the wide edge of the lower waveguide corresponding to the mounting hole, the fastening hole penetrates through the wide edge of the lower waveguide and extends into the impedance matching block to be communicated with the mounting hole, and an adhesive is filled in the fastening hole to fix the connecting part in the mounting hole; or a locking piece used for locking the connecting part in the mounting hole is arranged in the fastening hole. In the embodiment, the fastening hole communicated with the mounting hole is arranged below the wide side of the lower waveguide, and the adhesive is filled in the fastening hole to fix the connecting part in the mounting hole, or the locking part used for locking the connecting part in the mounting hole is arranged in the fastening hole, so that the connecting part on the coaxial inner conductor is fixed in the mounting hole, and the coaxial inner conductor is prevented from loosening.

According to one embodiment of the present invention, the impedance matching block includes a multi-step, and the mounting hole is opened on a front side of the step at the top. The impedance matching block in the embodiment includes multiple steps, which is beneficial to improving the standing wave performance.

According to one embodiment of the invention, a flange is attached to one end of the waveguide port, the flange being brazed to the one end of the waveguide port. In the embodiment, the flange plate is connected to one end of the waveguide port, so that the waveguide coaxial converter can be conveniently installed on a coaxial system.

Drawings

In order to more clearly illustrate the technical solution of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic diagram of a prior art waveguide coaxial converter;

FIG. 2 is a schematic structural diagram of a waveguide coaxial converter according to an embodiment of the present invention;

FIG. 3 is an exploded view of FIG. 2;

FIG. 4 is a top view of FIG. 2 after being straightened;

fig. 5 is a cross-sectional view taken along plane a-a of fig. 4.

In the drawings, the components represented by the respective reference numerals are listed below:

1. the coaxial connector comprises a waveguide body, 2, a coaxial connector, 3, a coaxial inner conductor, 4, a flange plate, 5, a first screw, 6, a waveguide, 7, a matching block, 8, a screw, 9, a pin, 10, an upper waveguide wide edge, 11, a lower waveguide wide edge, 12, a left waveguide narrow edge, 13, a right waveguide narrow edge, 14, a waveguide end face, 15, a waveguide cavity, 16, an impedance matching block, 20, a mounting plate, 21, a second screw, 22, a snap spring, 23, a gasket, 30, a coaxial part, 31, a matching convex part, 32, a connecting part, 33, a plugging part, 111, a fastening hole, 141, a through hole, 142, a first threaded hole, 161, a mounting hole, 201 and a connecting hole.

Detailed Description

To make the objects, technical solutions and advantages of the present application more clear, embodiments of the present application will be described in further detail below with reference to the accompanying drawings.

In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.

The present embodiment provides a waveguide coaxial converter, as shown in fig. 2 to 5, including: the waveguide comprises a waveguide body 1, wherein the upper side of the waveguide body 1 is an upper waveguide wide edge 10, the lower side of the waveguide body 1 is a lower waveguide wide edge 11, the left sides of the upper waveguide wide edge 10 and the lower waveguide wide edge 11 are connected with a left waveguide narrow edge 12, the right sides of the upper waveguide wide edge 10 and the lower waveguide wide edge 11 are connected with a right waveguide narrow edge 13, the left waveguide narrow edge 12 and the right waveguide narrow edge 13 are both positioned between the upper waveguide wide edge 10 and the lower waveguide wide edge 11, the front side of the waveguide body 1 is provided with a waveguide end surface 14 connected with the front end surfaces of the upper waveguide wide edge 10, the lower waveguide wide edge 11, the left waveguide narrow edge 12 and the right waveguide narrow edge 13, the rear side of the waveguide body 1 is opened to form a waveguide port, and a waveguide cavity 15 is defined between the upper waveguide wide edge 10, the lower waveguide wide edge 11, the left waveguide narrow edge 12, the right waveguide narrow; the impedance matching block 16 is positioned in the waveguide cavity 15, a first gap is formed between the front end face of the impedance matching block 16 and the inner side wall of the waveguide end face 14, the impedance matching block 16 is connected to the lower waveguide wide edge 11, and the impedance matching block 16, the waveguide end face 14 and the lower waveguide wide edge 11 are integrally connected or integrally processed; the coaxial connector 2 is installed on the outer side face of the waveguide end face 14, the coaxial connector 2 comprises a coaxial inner conductor 3, a through hole 141 communicated with the waveguide cavity 15 is formed in the waveguide end face 14, one end of the coaxial inner conductor 3 penetrates through the through hole 141 and is connected with the impedance matching block 16, a matching convex portion 31 is arranged at one end, connected with the impedance matching block 16, of the coaxial inner conductor 3, the matching convex portion 31 can be attached to the end face of the impedance matching block 16 to serve as a part of the impedance matching block 16, a second gap is formed between the front end face of the matching convex portion 16 and the inner side wall of the waveguide end face 14, and the other end of the coaxial inner conductor 3 is located in the coaxial.

In this embodiment, as shown in fig. 3 to 5, a first gap is formed between a front end surface of the impedance matching block 16 and an inner side wall of the waveguide end surface 14, the impedance matching block 16 is connected to the lower waveguide broad side 11, and the impedance matching block 16, the waveguide end surface 14 and the lower waveguide broad side 11 are integrally connected or integrally processed, so that the impedance matching block 16 and the lower waveguide broad side 11 are integrally connected, the position accuracy of the processed impedance matching block 16 is determined by the processing accuracy, and the impedance matching block 16 does not need to be assembled on the lower waveguide broad side 11, thereby avoiding the standing wave performance of the waveguide coaxial converter being affected by the assembly error caused by assembling the impedance matching block 16 on the lower waveguide broad side 11, and also eliminating the inconvenience of debugging and the installation position of the impedance matching block 16. Moreover, the positional relationship between the waveguide end face 14 and the impedance matching block 16 is determined by the processing accuracy, and the relative position between the through hole 141 on the waveguide end face 14 and the impedance matching block 16 is determined, so that the mounting accuracy of the coaxial inner conductor 3 is improved, the connection accuracy between the coaxial inner conductor 3 and the impedance matching block 16 is improved, and the standing wave performance of the waveguide coaxial converter is improved. Further, the matching convex portion 31 passes through the through hole 141 and can be attached to the end face of the impedance matching block 16 to match with the impedance matching block 16 to realize transition matching, the matching convex portion 31 is attached to the end face of the impedance matching block 16, the matching convex portion 31 serves as a part of the impedance matching block 16, which is equivalent to extending the length of the impedance matching block 16 to one side of the waveguide end face 14, the matching convex portion 31 fills a part of the gap, and the distance between the waveguide end face 14 and the end face of the matching block is small, so that the standing wave performance realized by the matching of the matching convex portion 31 and the impedance matching block 16 is ensured.

In this embodiment, the through hole 141 is provided in the middle of the waveguide end face 14, the through hole 141 is specifically a stepped hole with a large diameter at the left end, the waveguide end face 14 is further provided with two first threaded holes 142 for mounting the coaxial connector 2, the two first threaded holes 142 are respectively located at the left side and the right side of the through hole 141, one end of the coaxial connector 2 is fittingly inserted into the left end of the through hole 141, the end of the coaxial connector 2 close to the waveguide end face 14 is provided with the mounting plate 20, the mounting plate 20 is provided with the connecting holes 201 corresponding to the two first threaded holes 142 provided on the waveguide end face 14, and in this embodiment, the coaxial connector 2 is fixed on the waveguide end face 14 by; the second screw 21 passes through the connecting hole 201 on the mounting plate 20 and is in fit threaded connection with the first threaded hole 142. Further, in this embodiment, in order to improve the reliability of the fixed connection of the coaxial connector 2, a washer 23 and a circlip 22 are sleeved on the second screw 21, one side of the washer 23 is abutted against the mounting plate 20, and the circlip 22 is pressed between the screw head of the second screw 21 and the washer 23.

In one embodiment of the present invention, as shown in fig. 3 to 5, the coaxial inner conductor 3 further includes: a connecting portion 32 for connecting with the impedance matching block 16, connected to one end of the impedance matching block 16 and inserted into the impedance matching block 16, a matching protrusion 31 connected to the front portion of the connecting portion 32 and protruding toward the connecting portion 32, the matching protrusion 31 passing through the through hole 141 and being capable of being attached to the end face of the impedance matching block 16; and a coaxial portion 30, the coaxial portion 30 being connected to the front portion of the mating protrusion 31 and connected to the coaxial connector 2.

In the present embodiment, as shown in fig. 3 to 5, the matching protrusion 31 is connected to the front portion of the connection portion 32 and protrudes toward the circumferential side of the connection portion 32, and the matching protrusion 31 passes through the through hole 141 and can be attached to the end surface of the impedance matching block 16, and in addition, the connection portion 32 is inserted into the impedance matching block 16 and connected to the impedance matching block 16, so that the matching protrusion 31 is attached to the end surface of the impedance matching block 16. Further, the front end of the coaxial portion 30 in this embodiment is further connected to a plug portion 33, so that the external conductor is adapted to be plugged into the plug portion 33, and the connection port of the coaxial connector 2 in this embodiment is a 50 ohm coaxial port; the plug-in connection in the embodiment is in a petal-shaped structure. It should be noted that the coaxial connector 2 in this embodiment has a hollow structure inside, the insertion part 33 on the coaxial inner conductor 3 is located in the middle of the coaxial connector 2, and the insertion part 33 serves as a connection core of the coaxial connector 2, but the coaxial connector 2 may also have a connector with another structure, and the coaxial inner conductor 3 may also have another structure.

In one embodiment of the present invention, as shown in fig. 4 and 5, the first gap has a size greater than 2 mm. In this embodiment, the size of the first gap is larger than 2mm, so that the first gap can be milled by a milling cutter, the processing difficulty can be reduced, and the impedance matching block 16 can be processed and formed in the waveguide cavity 15. It should be noted that, the size of the first gap is greater than 2mm, which defines the minimum size, and when the size of the first gap is smaller, the machining difficulty of the milling cutter is larger, and the size of the first gap is generally 10mm, so as to reduce the machining difficulty, of course, the first gap may also take other values in the range greater than 2 mm. Further, the length dimension of the matching protrusion 31 on the coaxial inner conductor 3 in the present embodiment is adaptively set in accordance with the dimension of the first gap, and when the first gap is large, the length of the matching protrusion 31 is appropriately adjusted.

In one embodiment of the present invention, as shown in fig. 4 and 5, the waveguide cavity 15 has a rectangular structure. In the present embodiment, the waveguide cavity 15 has a rectangular structure, which facilitates the processing of the impedance matching block 16 in the waveguide cavity 15.

In one embodiment of the present invention, as shown in fig. 3 and 5, the upper waveguide wide side 10, the lower waveguide wide side 11, the left waveguide narrow side 12, the right waveguide narrow side 13 and the impedance matching block 16 are integrally connected or formed by integral processing, and the upper waveguide wide side 10 is assembled on the upper ends of the left waveguide narrow side 12 and the right waveguide narrow side 13. In this embodiment, the upper waveguide wide side 10, the lower waveguide wide side 11, the left waveguide narrow side 12, the right waveguide narrow side 13, and the impedance matching block 16 are integrally connected or formed by integral processing, and the upper waveguide wide side 10 is assembled on the upper ends of the left waveguide narrow side 12 and the right waveguide narrow side 13, which is beneficial to reducing the processing difficulty and facilitating the processing of the waveguide body 1.

In one embodiment of the present invention, as shown in fig. 2 and 5, the upper waveguide broad side 10 is soldered to the upper ends of the left waveguide narrow side 12 and the right waveguide narrow side 13. In the present embodiment, the upper waveguide wide side 10 is connected to the upper ends of the left waveguide narrow side 12 and the right waveguide narrow side 13 by soldering, which is beneficial to improving the reliability of the connection of the upper waveguide wide side 10.

In an embodiment of the present invention, as shown in fig. 5, the impedance matching block 16 is provided with a mounting hole 161, the mounting hole 161 and the through hole 141 are located on the same axis, and the connecting portion 32 is connected to the mounting hole 161 in a fitting manner. In the present embodiment, the impedance matching block 16 is provided with the mounting hole 161, and the matching protrusion 31 on the inner guide is stopped against the end face of the impedance matching block 16 by fitting and connecting the connecting portion 32 to the mounting hole 161, so that the matching protrusion 31 and the impedance matching block 16 perform a matching function together. In addition, the mounting hole 161 and the through hole 141 in the present embodiment are located on the same axis, so that the coaxial inner conductor 3 can be inserted through the through hole 141 and the axial center of the coaxial inner conductor 3 coincides with the center of the through hole 141, so that the axial center of the coaxial inner conductor 3 is located on the central line of the coaxial connector 2 when the coaxial connector 2 is mounted on the waveguide end surface 14.

In one embodiment of the present invention, as shown in fig. 5, the mounting hole 161 is a threaded hole, the connecting portion 32 is provided with an external thread, and the connecting portion 32 is in threaded connection with the threaded hole. In this embodiment, the mounting hole 161 is a threaded hole, the connecting portion 32 is provided with an external thread, so that the connecting portion 32 and the mounting hole 161 can be connected by the thread, and the coaxial inner conductor 3 is screwed, so that the matching protrusion 31 on the coaxial inner conductor 3 can be stopped on the waveguide end surface 14, and the matching protrusion 31 and the impedance matching block 16 can achieve matching effect together.

In one embodiment of the present invention, as shown in fig. 5, the impedance matching block 16 is connected to the lower waveguide broadside 11, a fastening hole 111 is formed in the lower waveguide broadside 11 corresponding to the mounting hole 161, the fastening hole 111 penetrates through the lower waveguide broadside 11 and extends into the impedance matching block 16 to communicate with the mounting hole 161, and a locking member for locking the connecting portion 32 in the mounting hole 161 is installed in the fastening hole 111. In the present embodiment, a fastening hole 111 communicating with the mounting hole 161 is formed below the lower waveguide broadside 11, and a locking member for locking the connecting portion 32 in the mounting hole 161 is installed in the fastening hole 111, so that the connecting portion 32 of the coaxial inner conductor 3 is fixed in the mounting hole 161, and the coaxial inner conductor 3 is prevented from being loosened. Further, the impedance matching block 16 in the present embodiment is located at the middle position of the lower waveguide broad side 11, and the fastening hole 111 extends upward from the lower side of the lower waveguide broad side 11 and communicates with the mounting hole 161; the locking member in this embodiment is a first screw 5, the fastening hole 111 is a threaded hole, and the upper end of the first screw 5 is pressed against the connecting portion 32 by tightening the first screw 5, so that the coaxial inner conductor 3 is fixed in the mounting hole 161.

In this embodiment, the fastening hole 111 may be filled with an adhesive to fix the connection portion 32 in the mounting hole 161, the mounting hole 161 may be filled with an adhesive to bond the connection portion 32 mounted in the mounting hole 161 with the adhesive, and the connection portion 32 of the coaxial inner conductor 3 may be fixed in the mounting hole 161.

In one embodiment of the present invention, as shown in fig. 3 and 5, the impedance matching block 16 includes a plurality of steps, and the mounting hole 161 is opened on the front side of the step located at the top. In the present embodiment, the impedance matching block 16 includes multiple steps, which is beneficial to improving the standing wave performance; in addition, the impedance matching block 16 in the present embodiment has three steps, and the number of steps of the impedance matching block 16 is designed as needed.

In one embodiment of the present invention, as shown in fig. 2 and 5, a flange 4 is connected to one end of the waveguide port, and the flange 4 is soldered to the one end of the waveguide port. In this embodiment, the waveguide coaxial converter is easily mounted on a coaxial system by connecting a flange 4 to one end of the waveguide port. The flange 4 in this embodiment is brazed to the waveguide port.

Specifically, in the present embodiment, a first gap is formed between the front end surface of the impedance matching block 16 and the inner side wall of the waveguide end surface 14, the impedance matching block 16 is connected to the lower waveguide broad side 11, and the impedance matching block 16, the waveguide end surface 14 and the lower waveguide broad side 11 are integrally connected or integrally processed, so that the impedance matching block 16 and the lower waveguide broad side 11 are integrally connected, the position accuracy of the processed impedance matching block 16 is determined by the processing accuracy, and the impedance matching block 16 does not need to be assembled on the lower waveguide broad side 11, thereby avoiding the assembly error caused by the assembly of the impedance matching block 16 on the lower waveguide broad side 11 from affecting the standing wave performance of the waveguide coaxial converter, and also avoiding the inconvenience of debugging and the installation position of the impedance matching block 16. Moreover, the positional relationship between the waveguide end face 14 and the impedance matching block 16 is determined by the processing accuracy, and the relative position between the through hole 141 on the waveguide end face 14 and the impedance matching block 16 is determined, so that the mounting accuracy of the coaxial inner conductor 3 is improved, the connection accuracy between the coaxial inner conductor 3 and the impedance matching block 16 is improved, and the standing wave performance of the waveguide coaxial converter is improved. Further, the matching convex portion 31 passes through the through hole 141 and can be attached to the end face of the impedance matching block 16 to match with the impedance matching block 16 to realize transition matching, the matching convex portion 31 is attached to the end face of the impedance matching block 16, the matching convex portion 31 serves as a part of the impedance matching block 16, which is equivalent to extending the length of the impedance matching block 16 to one side of the waveguide end face 14, the matching convex portion 31 fills a part of the gap, and the distance between the waveguide end face 14 and the end face of the matching block is small, so that the standing wave performance realized by the matching of the matching convex portion 31 and the impedance matching block 16 is ensured. Therefore, the waveguide coaxial converter in the embodiment can overcome assembly errors and improve standing wave performance, and the waveguide coaxial converter in the embodiment can realize standing waves smaller than 1.1 in a full frequency band under the condition that debugging is not needed.

In addition to the technical solutions disclosed in the present embodiment, for other structures of the waveguide coaxial converter and the operation principle of the waveguide coaxial converter in the present invention, reference may be made to conventional technical solutions in the present technical field, and these conventional technical solutions are not the gist of the present invention, and the present invention is not set forth herein in detail.

In the present invention, the term "plurality" means two or more unless explicitly defined otherwise. The terms "mounted," "connected," "fixed," and the like are to be construed broadly, and for example, "connected" may be a fixed connection, a removable connection, or an integral connection; "coupled" may be direct or indirect through an intermediary. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.