CN113346214B - Ridge waveguide coaxial converter - Google Patents
Ridge waveguide coaxial converter Download PDFInfo
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- CN113346214B CN113346214B CN202110573065.5A CN202110573065A CN113346214B CN 113346214 B CN113346214 B CN 113346214B CN 202110573065 A CN202110573065 A CN 202110573065A CN 113346214 B CN113346214 B CN 113346214B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P5/00—Coupling devices of the waveguide type
- H01P5/08—Coupling devices of the waveguide type for linking dissimilar lines or devices
- H01P5/10—Coupling devices of the waveguide type for linking dissimilar lines or devices for coupling balanced lines or devices with unbalanced lines or devices
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Abstract
The invention discloses a ridge waveguide coaxial converter, belonging to the technical field of waveguide coaxial conversion equipment, comprising: the waveguide comprises a ridge waveguide body, wherein a waveguide cavity is arranged in the ridge waveguide body, a waveguide end face is arranged at the rear end of the ridge waveguide body, a through hole communicated with the waveguide cavity is formed in the rear end of the waveguide end face, a waveguide port is formed by an opening at the front end of the ridge waveguide body, and an impedance matching waveguide ridge I and an impedance matching waveguide ridge II are arranged in the waveguide cavity; the inner side of the end face of the waveguide is provided with a mounting cavity, and the bottom wall of the mounting cavity is planar to form a mounting plane; the coaxial connector comprises a coaxial inner conductor, a coaxial medium and a coaxial outer conductor, the coaxial inner conductor penetrates through the through hole and is connected with the rear end of the first impedance matching waveguide ridge, a connecting plane is arranged on the coaxial medium and right faces the mounting plane, the connecting plane is attached to the mounting plane, and the coaxial inner conductor, the coaxial medium and the mounting plane form a quasi-microstrip transmission structure. The ridge waveguide coaxial connector can improve the working frequency band.
Description
Technical Field
The invention relates to the technical field of waveguide coaxial conversion equipment, in particular to a ridge waveguide coaxial converter.
Background
The waveguide coaxial converter belongs to a commonly used passive connector and is widely applied to microwave feed networks of various radars and communication systems; the dual-port microwave device mainly comprises a waveguide, a radio frequency coaxial and matching structure, and has the advantages of good port impedance matching characteristic and small insertion loss among ports.
At present, a ridge waveguide coaxial converter is a waveguide coaxial converter widely adopted, and the existing ridge waveguide coaxial converter is a direct insertion type, namely a coaxial connector on the ridge waveguide coaxial converter forms a 90-degree included angle with a waveguide, and when transmission power is high, the top of a probe in the ridge waveguide coaxial converter is easy to break down and damage; further, with the forward development of science and technology, the working bandwidth of the microwave communication system is wider and wider, the bandwidth requirement on the microwave device is higher and higher, and the existing waveguide coaxial converter is difficult to meet the working bandwidth requirement of the microwave communication system; in addition, in-line ridge waveguide coaxial converters are not conducive to cascading in many microwave feed systems. Thus, there is a need for a ridge waveguide coaxial converter that can improve the operating frequency band.
Disclosure of Invention
It is an object of the present invention to overcome at least one of the above-mentioned deficiencies of the prior art and to provide a ridge waveguide coaxial connector capable of increasing the operating frequency band.
The technical scheme for solving the technical problems is as follows: a ridge waveguide coaxial connector comprising:
the waveguide structure comprises a ridge waveguide body, wherein a waveguide cavity is arranged in the ridge waveguide body, a waveguide end surface is arranged at the rear end of the ridge waveguide body, a through hole is formed in the rear end of the waveguide end surface, the through hole extends forwards and is communicated with the waveguide cavity, a waveguide port is formed by opening the front end of the ridge waveguide body, an impedance matching waveguide ridge is arranged in the waveguide cavity and comprises a first impedance matching waveguide ridge and a second impedance matching waveguide ridge, the first impedance matching waveguide ridge is connected to the top wall of the waveguide cavity and protrudes downwards, and the second impedance matching waveguide ridge is right opposite to the first impedance matching waveguide ridge and is connected to the bottom wall of the waveguide cavity and protrudes upwards;
the inner side of the waveguide end face is provided with an installation cavity, the installation cavity is arranged on the upper part of the waveguide end face opposite to the impedance matching waveguide ridge I, the installation cavity is communicated with the waveguide cavity and the through hole, and the bottom wall of the installation cavity is planar to form an installation plane; or the mounting cavity is arranged at the lower part of the end face of the waveguide opposite to the impedance matching waveguide ridge II, the mounting cavity is communicated with the waveguide cavity and the through hole, and the top wall of the mounting cavity is planar to form a mounting plane;
further comprising:
coaxial joint installs the rear end of waveguide terminal surface, coaxial joint includes coaxial inner conductor, coaxial medium and coaxial outer conductor, coaxial inner conductor passes the through-hole extends forward and forms the extension end, coaxial inner conductor's extension end with the rear end of impedance matching waveguide spine one or the rear end of impedance matching waveguide spine two is connected, coaxial medium passes the through-hole extends forward and forms the extension end, just right on the lateral wall of coaxial medium's extension end the mounting plane is equipped with the orientation the sunken connecting plane in inboard of coaxial medium, connecting plane with the mounting plane laminating is connected, coaxial inner conductor coaxial medium with the mounting plane constitutes accurate microstrip transmission structure, coaxial outer conductor with the rear end of waveguide terminal surface is connected.
The invention has the beneficial effects that: in this embodiment, an installation cavity is formed inside the waveguide end face, an installation plane is formed inside the installation cavity, a connection plane recessed toward the inner side of the coaxial medium is formed on the outer side wall of the extension end of the coaxial connector and facing the installation plane, the connection plane is attached to the installation plane, and the coaxial inner conductor and the installation plane have a certain distance, so that the coaxial inner conductor, the coaxial medium, and the installation plane form a quasi-microstrip transmission structure, and the impedance matching waveguide ridge i and the impedance matching waveguide ridge ii in the installation cavity form an impedance matching structure, which together and reliably realize broadband conversion from ridge waveguide to radio frequency coaxial, thereby facilitating improvement of working frequency band, and in addition, realizing simple broadband impedance matching structure between ridge waveguide and quasi-microstrip transmission structure; furthermore, the coaxial connector is arranged at the rear end of the waveguide end face, so that a radio frequency coaxial port and a ridge waveguide port are in the same plane, and the cascade connection of a microwave feed system is facilitated.
In addition, on the basis of the technical scheme, the invention can be improved as follows, and can also have the following additional technical characteristics.
According to one embodiment of the present invention, the upper side of the ridge waveguide body is an upper waveguide broad side, the lower side of the ridge waveguide body is a lower waveguide broad side, the left sides of the upper waveguide broad side and the lower waveguide broad side are connected with a left waveguide narrow side, the right sides of the upper waveguide broad side and the lower waveguide broad side are connected with a right waveguide narrow side, and the upper waveguide broad side, the lower waveguide broad side, the left waveguide narrow side, the right waveguide narrow side and the waveguide end surface define therebetween to form the waveguide cavity;
the first impedance matching waveguide ridge is of a multi-stage step-shaped structure, is connected to the wide edge of the upper waveguide and protrudes downwards, and is gradually increased from the front to the center of the backward waveguide cavity;
the second impedance matching waveguide ridge is of a multi-stage stepped structure, the second impedance matching waveguide ridge is connected to the lower waveguide wide edge and protrudes upwards, the second impedance matching waveguide ridge is gradually increased from the front to the center of the backward waveguide cavity, and the second impedance matching waveguide ridge and the first impedance matching waveguide ridge are arranged in a mirror symmetry mode.
In the embodiment, the first impedance matching waveguide ridge and the second impedance matching waveguide ridge are in a multi-stage step-shaped structure, the first impedance matching waveguide ridge and the second impedance matching waveguide ridge are both gradually increased from the front to the center of the backward waveguide cavity, the second impedance matching waveguide ridge and the first impedance matching waveguide ridge are arranged in mirror symmetry, the first impedance matching waveguide ridge and the second impedance matching waveguide ridge form a step-shaped impedance matching structure between the waveguide port and the radio frequency coaxial port, broadband impedance matching is performed for electrical discontinuity between the waveguide port and the quasi-microstrip transmission structure, and through gradual transition between the quasi-microstrip transmission structure and the radio frequency coaxial port, the ridge waveguide coaxial converter can work well in an octave (bandwidth is about 70%) working frequency band, and the problem that the direct-insert ridge waveguide coaxial converter is not easy to realize axial interconnection with other microwave devices is solved.
According to one embodiment of the invention, the first impedance matching waveguide ridge of the multi-stage stepped structure comprises a first-stage impedance matching protrusion I, a second-stage impedance matching protrusion I, a third-stage impedance matching protrusion I and a fourth-stage impedance matching protrusion I, wherein the first-stage impedance matching protrusion I, the second-stage impedance matching protrusion I, the third-stage impedance matching protrusion I and the fourth-stage impedance matching protrusion I are sequentially connected from front to back;
the second impedance matching waveguide ridge of the multistage stepped structure comprises a second first-stage impedance matching protrusion, a second third-stage impedance matching protrusion and a second fourth-stage impedance matching protrusion, and the second first-stage impedance matching protrusion, the second third-stage impedance matching protrusion and the second fourth-stage impedance matching protrusion are sequentially connected from front to back.
The first impedance matching waveguide ridge and the second impedance matching waveguide ridge of the present embodiment respectively include four levels of impedance matching protrusions, perform broadband impedance matching on electrical discontinuity between the waveguide port and the quasi-microstrip transmission structure, and improve the impedance matching characteristics of the stepped impedance matching structure formed by the first impedance matching waveguide ridge and the second impedance matching waveguide ridge through gradual transition between the quasi-microstrip transmission structure and the radio frequency coaxial port, and improve the operating frequency band.
According to an embodiment of the present invention, the heights of the first-order impedance matching bump and the second-order impedance matching bump are both 0.1 λ °, the heights of the first-order impedance matching bump and the second-order impedance matching bump are both 0.105 λ °, the heights of the first-order impedance matching bump and the second-order impedance matching bump are both 0.137 λ °, the heights of the first-order impedance matching bump and the second-order impedance matching bump are both 0.165 λ °, and λ ° is a wavelength corresponding to the center frequency. In this embodiment, each level of the impedance matching protrusion in the first impedance matching waveguide ridge and the second impedance matching waveguide ridge has the height, and the height difference between the impedance matching protrusions is appropriate, so that the impedance matching characteristic of the stepped impedance matching structure formed by the first impedance matching waveguide ridge and the second impedance matching waveguide ridge is improved.
According to an embodiment of the present invention, a width of the first secondary impedance matching protrusion in the left-right direction is not greater than a width of the first primary impedance matching protrusion, a width of the first tertiary impedance matching protrusion in the left-right direction is not greater than a width of the first secondary impedance matching protrusion, and a width of the first quaternary impedance matching protrusion in the left-right direction is smaller than a width of the first tertiary impedance matching protrusion. In this embodiment, the width of the first four-stage impedance matching protrusion in the left-right direction is smaller than that of the first three-stage impedance matching protrusion, so that the impedance matching characteristic of the stepped impedance matching structure formed by the first impedance matching waveguide ridge and the second impedance matching waveguide ridge is improved.
According to one embodiment of the invention, the width of the mounting plane in the left-right direction is larger than the width of the first impedance matching waveguide ridge and smaller than the width of the waveguide cavity. In this embodiment, the width of the mounting plane in the left-right direction is greater than the width of the first impedance-matched waveguide ridge and less than the width of the waveguide cavity, so as to ensure the impedance matching characteristic between the quasi-microstrip transmission structure formed by the coaxial inner conductor, the coaxial medium and the mounting plane and the stepped impedance matching structure formed by the first impedance-matched waveguide ridge and the second impedance-matched waveguide ridge, and prevent the microwave signal passing through the quasi-microstrip transmission structure from generating resonance due to the excessively wide mounting plane.
According to an embodiment of the present invention, the first impedance-matched waveguide ridge, the second impedance-matched waveguide ridge and the mounting cavity are symmetrically disposed with respect to a vertical center plane of the waveguide cavity in the left-right direction, respectively. In this embodiment, the first impedance matching waveguide ridge and the second impedance matching waveguide ridge are respectively symmetrically arranged relative to a vertical central plane of the waveguide cavity, so as to improve the impedance matching characteristic of an impedance matching structure formed by the first impedance matching waveguide ridge and the second impedance matching waveguide ridge; in this embodiment, the mounting cavities are symmetrically arranged relative to the vertical central plane of the waveguide cavity, so that the first impedance matching waveguide ridge, the second impedance matching waveguide ridge and the mounting cavities are located on the same plane, which is beneficial for the coaxial connector to be connected to the rear end of the first impedance matching waveguide ridge or the second impedance matching waveguide ridge, so that the radio frequency coaxial port and the ridge waveguide port are coplanar, and the microwave feed system is beneficial to cascade.
According to one embodiment of the invention, a flange is connected to the front end of the waveguide port. In the embodiment, the flange plate is connected to one end of the waveguide port, so that the ridge waveguide coaxial converter is directly connected with the microwave device.
According to an embodiment of the present invention, the mounting cavity is located at an upper portion of the waveguide end face, and the mounting plane is flush with a top portion of a rear end of the second impedance matching waveguide ridge, or the mounting cavity is located at a lower portion of the waveguide end face, and the mounting plane is flush with a bottom portion of the rear end of the first impedance matching waveguide ridge. The mounting plane in this embodiment with the rear end top parallel and level of impedance matching waveguide ridge two or with the rear end bottom parallel and level of impedance matching waveguide ridge one is favorable to processing to form the mounting plane, reduces the processing degree of difficulty of mounting plane.
According to an embodiment of the present invention, the extension end of the coaxial inner conductor stops at the rear end of the first impedance matching waveguide ridge or the rear end of the second impedance matching waveguide ridge. In this embodiment, the extension end of the coaxial inner conductor abuts against the rear end of the first impedance matching waveguide ridge or the rear end of the second impedance matching waveguide ridge, so that the coaxial inner conductor is electrically connected to the rear end of the first impedance matching waveguide ridge or the rear end of the second impedance matching waveguide ridge, and the connection manner is simple.
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 structural view of a ridge waveguide coaxial connector according to an embodiment of the present invention;
FIG. 2 is a front view of FIG. 1 after being straightened;
FIG. 3 is a top view of FIG. 2;
FIG. 4 is a right side view of FIG. 2;
FIG. 5 is a cross-sectional view of the structure of FIG. 1 taken along the front-rear direction from the middle;
FIG. 6 is a right side view of FIG. 5 after being straightened;
fig. 7 is a schematic structural diagram of a coaxial connector according to an embodiment of the present invention.
In the drawings, the components represented by the respective reference numerals are listed below:
1. the waveguide comprises a ridge waveguide body, 2, a coaxial connector, 3, a bolt, 10, a waveguide cavity, 11, a second impedance matching waveguide ridge, 12, a first impedance matching waveguide ridge, 13, a flange plate, 14, a mounting cavity, 20, a coaxial outer conductor, 21, a coaxial medium, 22, a coaxial inner conductor, 111, a second first impedance matching protrusion, 112, a second impedance matching protrusion, 113, a third impedance matching protrusion, 114, a fourth impedance matching protrusion, 131, a threaded hole, 141, a mounting plane, 121, a first impedance matching protrusion, 122, a first second impedance matching protrusion, 123, a first third impedance matching protrusion, 124, a first fourth impedance matching protrusion, 201, a connector flange, 202, a bolt through hole, 211 and a connecting plane.
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 otherwise than as 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 ridge waveguide coaxial connector, as shown in fig. 1 to 7, including:
the waveguide comprises a ridge waveguide body 1, wherein a waveguide cavity 10 is arranged in the ridge waveguide body 1, a waveguide end face is arranged at the rear end of the ridge waveguide body 1, a through hole is formed in the rear end of the waveguide end face, the through hole extends forwards and is communicated with the waveguide cavity 10, a waveguide port is formed in the opening of the front end of the ridge waveguide body 1, an impedance matching waveguide ridge is arranged in the waveguide cavity 10 and comprises a first impedance matching waveguide ridge 12 and a second impedance matching waveguide ridge 11, the first impedance matching waveguide ridge 12 is connected to the top wall of the waveguide cavity 10 and protrudes downwards, and the second impedance matching waveguide ridge 11 just faces the first impedance matching waveguide ridge 12 and is connected to the bottom wall of the waveguide cavity 10 and protrudes upwards;
the inner side of the waveguide end face is provided with a mounting cavity 14, the mounting cavity 14 is arranged on the upper part of the waveguide end face opposite to the first impedance matching waveguide ridge 12, the mounting cavity 14 is communicated with the waveguide cavity 10 and the through hole, and the bottom wall of the mounting cavity 14 is planar to form a mounting plane 141;
further comprising:
the coaxial connector 2 is installed at the rear end of the waveguide end face, the coaxial connector 2 comprises a coaxial inner conductor 22, a coaxial medium 21 and a coaxial outer conductor 20, the coaxial inner conductor 22 penetrates through the through hole to extend forwards to form an extending end, the extending end of the coaxial inner conductor 22 is connected with the rear end of the impedance matching waveguide ridge I12, the coaxial medium 21 penetrates through the through hole to extend forwards to form an extending end, a connecting plane 211 which is sunken towards the inner side of the coaxial medium 21 is arranged on the outer side wall of the extending end of the coaxial medium 21 and right faces the installation plane 141, the connecting plane 211 is connected with the installation plane 141 in an attaching mode, the coaxial inner conductor 22, the coaxial medium 21 and the installation plane 141 form a quasi-microstrip transmission structure, and the coaxial outer conductor 20 is connected with the rear end of the waveguide end face.
Further, the mounting cavity 14 in this embodiment may also be disposed at the lower portion of the waveguide end face opposite to the second impedance matching waveguide ridge 11, the mounting cavity 14 is communicated with the waveguide cavity 10 and the through hole, the top wall of the mounting cavity 14 is planar to form a mounting plane 141, and the rear end of the second impedance matching waveguide ridge 11 is connected.
In this embodiment, as shown in fig. 1 to 6, an installation cavity 14 is disposed on an inner side of a waveguide end surface in this embodiment, an installation plane 141 is formed in the installation cavity 14, a connection plane 211 recessed toward an inner side of the coaxial medium 21 is disposed on an outer side wall of an extending end of the coaxial connector 2 facing the installation plane 141, the connection plane 211 is attached to the installation plane 141, and the coaxial inner conductor 22 has a certain distance from the installation plane 141, so that the coaxial inner conductor 22, the coaxial medium 21, and the installation plane 141 form a quasi-microstrip transmission structure, and the first impedance matching waveguide ridge 12 and the second impedance matching waveguide ridge 11 in the installation cavity 14 form an impedance matching structure, which together and reliably implement broadband conversion from a ridge waveguide to radio frequency coaxial; and the extension end of the coaxial inner conductor 22 of the coaxial connector 2 is connected with the rear end of the first impedance matching waveguide ridge 12 or the rear end of the second impedance matching waveguide ridge 11, and is opposite to the plug-in ridge waveguide coaxial converter; furthermore, the coaxial connector 2 is arranged at the rear end of the waveguide end face, which is beneficial to the coplanarity of the radio frequency coaxial port and the ridge waveguide port and is beneficial to the cascade connection of the microwave feed system. The material of the ridge waveguide body 1 in the present embodiment is the same as that of the ridge waveguide in the related art, and the material of the ridge waveguide body 1 is metal.
In the present embodiment, when a microwave signal is fed from the ridge waveguide body 1, impedance matching between the double ridge waveguide with high characteristic impedance and the coaxial line with low characteristic impedance is realized through step impedance transformation in the ridge waveguide body 1, and mode conversion from the TE10 mode in the double ridge waveguide to the TEM mode in the coaxial line is realized through a quasi-microstrip transmission structure formed by the impedance matching waveguide ridge, the coaxial inner conductor 22, the coaxial medium 21 and the mounting plane 141, and finally, broadband operation of the ridge waveguide coaxial converter is realized. It should be noted that the quasi-microstrip transmission structure in this embodiment is a quasi-microstrip transmission line, and the quasi-microstrip transmission structure is similar to the microstrip line and has the characteristics of the microstrip line; further, the coaxial line in the present embodiment is used to connect to the rear end of the coaxial connector 2, and in addition, the ridge waveguide body 1 in the present embodiment can also be regarded as a double ridge waveguide.
In one embodiment of the present invention, as shown in fig. 1, fig. 2, fig. 5, and fig. 6, the upper side of the ridge waveguide body 1 is an upper waveguide wide edge, the lower side of the ridge waveguide body 1 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, and a waveguide cavity 10 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 surface;
the first impedance matching waveguide ridge 12 is of a multi-stage step structure, the first impedance matching waveguide ridge 12 is connected to the wide edge of the upper waveguide and protrudes downwards, and the first impedance matching waveguide ridge 12 is gradually increased from the front to the center of the backward waveguide cavity 10;
the second impedance matching waveguide ridge 11 is of a multi-stage stepped structure, the second impedance matching waveguide ridge 11 is connected to the wide edge of the lower waveguide and protrudes upwards, the second impedance matching waveguide ridge 11 is gradually increased from the front to the center of the backward waveguide cavity 10, and the second impedance matching waveguide ridge 11 and the first impedance matching waveguide ridge 12 are arranged in mirror symmetry.
In the present embodiment, as shown in fig. 1, 2, 5 and 6, the first impedance matching waveguide ridge 12 and the second impedance matching waveguide ridge 11 have a multi-step structure, the first impedance matching waveguide ridge 12 and the second impedance matching waveguide ridge 11 are each formed such that they are gradually higher from the center of the front-to-rear waveguide cavity 10, the second impedance matching waveguide ridge 11 and the first impedance matching waveguide ridge 12 are arranged in mirror symmetry, the first impedance matching waveguide ridge 12 and the second impedance matching waveguide ridge 11 form a stepped impedance matching structure between the waveguide port and the radio frequency coaxial port, broadband impedance matching of the electrical discontinuity between the waveguide port and the quasi-microstrip transmission structure, and through gradual transition between the quasi-microstrip transmission structure and the radio frequency coaxial port, the ridge waveguide coaxial converter can work well in an octave (the bandwidth is about 70%) working frequency band, and the problem that the direct-insert ridge waveguide coaxial converter is not easy to realize axial interconnection with other microwave devices is solved. Further, the first impedance matching waveguide ridge 12 and the second impedance matching waveguide ridge 11 in this embodiment may have two steps, or may have three, four, or more steps according to the bandwidth requirement.
In this embodiment, as shown in fig. 1, 3, 4 and 7, the ridge waveguide body 1 in this embodiment is rectangular, the waveguide cavity 10 is rectangular, the front end of the coaxial outer conductor 20 in this embodiment is connected to a connector flange 201, two bolt through holes are formed in the connector flange 201, the rear end of the ridge waveguide body 1 is provided with threaded holes corresponding to the two bolt through holes, and the connector flange 201 is fixed to the rear end of the ridge waveguide body 1 by bolts 3. Further, the ridge waveguide body 1 in the present embodiment may be provided in other structures, and the coaxial outer conductor 20 in the present embodiment may be connected to the rear end of the waveguide end face by welding or the like. In addition, the ridge waveguide body 1 in the present embodiment may be integrally formed, or may be formed by brazing the upper and lower portions. It should be noted that the coaxial connector 2 in the present embodiment can be obtained by cutting out a part of the coaxial medium on the existing coaxial connector.
In an embodiment of the present invention, as shown in fig. 1, fig. 2, fig. 5, and fig. 6, the impedance matching waveguide ridge 12 of the multi-step structure includes a first-stage impedance matching protrusion 121, a second-stage impedance matching protrusion 122, a third-stage impedance matching protrusion 123, and a fourth-stage impedance matching protrusion 124, where the first-stage impedance matching protrusion 121, the second-stage impedance matching protrusion 122, the third-stage impedance matching protrusion 123, and the fourth-stage impedance matching protrusion 124 are sequentially connected from front to back;
the second impedance matching waveguide ridge 11 of the multistage stepped structure includes a second first-stage impedance matching protrusion 111, a second-stage impedance matching protrusion 112, a second third-stage impedance matching protrusion 113, and a second fourth-stage impedance matching protrusion 114, and the second first-stage impedance matching protrusion 111, the second-stage impedance matching protrusion 112, the second third-stage impedance matching protrusion 113, and the second fourth-stage impedance matching protrusion 114 are sequentially connected from front to back.
In this embodiment, as shown in fig. 1, 2, 5, and 6, the first impedance-matched waveguide ridge 12 and the second impedance-matched waveguide ridge 11 respectively include four levels of impedance-matching protrusions, perform broadband impedance matching on electrical discontinuity between the waveguide port and the quasi-microstrip transmission structure, and improve the impedance matching characteristics of the stepped impedance-matching structure formed by the first impedance-matched waveguide ridge 12 and the second impedance-matched waveguide ridge 11 and the operating frequency band by means of gradual transition between the quasi-microstrip transmission structure and the radio frequency coaxial port.
In an embodiment of the present invention, as shown in fig. 2, 5, and 6, the heights of the first-order impedance matching bump 121 and the first-order impedance matching bump 111 are both 0.1 λ °, the heights of the second-order impedance matching bump 122 and the second-order impedance matching bump 112 are both 0.105 λ °, the heights of the third-order impedance matching bump 123 and the third-order impedance matching bump 113 are both 0.137 λ °, the heights of the fourth-order impedance matching bump 124 and the fourth-order impedance matching bump 114 are both 0.165 λ °, and λ ° is a wavelength corresponding to the center frequency. In this embodiment, each level of the impedance matching protrusion in the first impedance matching waveguide ridge 12 and the second impedance matching waveguide ridge 11 has the above height, and the height difference between the impedance matching protrusions is appropriate, so that the impedance matching characteristic of the stepped impedance matching structure formed by the first impedance matching waveguide ridge 12 and the second impedance matching waveguide ridge 11 is improved. Further, the heights of the impedance matching projections of the respective stages in the first impedance matching waveguide ridge 12 and the second impedance matching waveguide ridge 11 in the present embodiment may be set to other heights as necessary.
In one embodiment of the present invention, as shown in fig. 2, the width of the first secondary impedance matching protrusion 122 in the left-right direction is not greater than the width of the first primary impedance matching protrusion 121, the width of the first tertiary impedance matching protrusion 123 in the left-right direction is not greater than the width of the first secondary impedance matching protrusion 122, and the width of the first quaternary impedance matching protrusion 124 in the left-right direction is less than the width of the first tertiary impedance matching protrusion 123. In this embodiment, the width of the first four-stage impedance matching protrusion 124 in the left-right direction is smaller than the width of the first three-stage impedance matching protrusion 123, so as to improve the impedance matching characteristic of the impedance matching structure formed by the first impedance matching waveguide ridge 12 and the second impedance matching waveguide ridge 11. Further, the lengths of the first-stage impedance matching protrusion one 121 to the fourth-stage impedance matching protrusion one 124 in this embodiment may be set as needed, and the structure of the impedance matching waveguide ridge two 11 is the same as the structure of the impedance matching waveguide ridge one 12.
In one embodiment of the present invention, as shown in fig. 2, the width of the mounting plane 141 in the left-right direction is greater than the width of the first impedance-matched waveguide ridge 12 and less than the width of the waveguide cavity 10. In this embodiment, the width of the mounting plane 141 in the left-right direction is greater than the width of the first impedance matching waveguide ridge 12 and smaller than the width of the waveguide cavity 10, so as to ensure the impedance matching characteristics between the quasi-microstrip transmission structure formed by the coaxial inner conductor 22, the coaxial medium 21 and the mounting plane 141 and the impedance matching structure formed by the first impedance matching waveguide ridge 12 and the second impedance matching waveguide ridge 11, and prevent the mounting plane 141 from being too wide and causing the microwave signal passing through the quasi-microstrip transmission structure to generate resonance.
In one embodiment of the present invention, as shown in fig. 2 and 5, the first impedance-matched waveguide ridge 12, the second impedance-matched waveguide ridge 11, and the mounting cavity 14 are respectively symmetrically disposed with respect to a vertical center plane of the waveguide cavity 10 in the left-right direction. In this embodiment, the first impedance matching waveguide ridge 12 and the second impedance matching waveguide ridge 11 are respectively symmetrically arranged with respect to the vertical central plane of the waveguide cavity 10, so as to improve the impedance matching characteristics of the impedance matching structure formed by the first impedance matching waveguide ridge 12 and the second impedance matching waveguide ridge 11; in this embodiment, the mounting cavities 14 are symmetrically arranged with respect to the vertical central plane of the waveguide cavity 10, so that the first impedance matching waveguide ridge 12, the second impedance matching waveguide ridge 11 and the mounting cavities 14 are located on the same plane, which is beneficial for the coaxial connector 2 to be connected to the rear end of the first impedance matching waveguide ridge 12 or the second impedance matching waveguide ridge 11, so that the radio frequency coaxial port and the ridge waveguide port are coplanar, and the microwave feed system is beneficial to cascade connection.
In one embodiment of the present invention, as shown in fig. 1 to 6, a flange 13 is connected to the front end of the waveguide port. In this embodiment, a flange 13 is connected to one end of the waveguide port, and the flange 13 is provided with a plurality of threaded holes 131, so that the ridge waveguide coaxial converter and the microwave device can be directly connected through bolts; further, the flange 13 in this embodiment is brazed to the waveguide port, and the flange 13 may be connected to the waveguide port in other manners.
In one embodiment of the present invention, as shown in fig. 2, 5 and 6, the mounting cavity 14 is located at the upper part of the waveguide end face, and the mounting plane 141 is flush with the top of the back end of the second impedance matching waveguide ridge 11. In this embodiment, the mounting plane 141 is flush with the top of the rear end of the second impedance matching waveguide ridge 11, which is beneficial to forming the mounting plane 141 by machining and reduces the machining difficulty of the mounting plane 141.
Further, the mounting cavity 14 in this embodiment may also be opened at the lower portion of the waveguide end face, and the mounting plane 141 is flush with the bottom of the rear end of the first impedance matching waveguide ridge 12; the installation plane 141 can be easily formed by machining, and the machining difficulty of the installation plane 141 is reduced. In addition, the mounting cavities 14 in this embodiment are all rectangular structures, and the mounting cavities 14 may be further configured to have other structures, so that the coaxial medium 21 is conveniently attached to the mounting plane 141.
In one embodiment of the present invention, as shown in fig. 2, 5 and 6, the extended end of the coaxial inner conductor 22 is stopped at the rear end of the first impedance matching waveguide ridge 12 or the rear end of the second impedance matching waveguide ridge 11. In the embodiment, the extending end of the coaxial inner conductor 22 is stopped at the rear end of the first impedance matching waveguide ridge 12 or the rear end of the second impedance matching waveguide ridge 11, so that the coaxial inner conductor 22 and the rear end of the first impedance matching waveguide ridge 12 or the rear end of the second impedance matching waveguide ridge 11 are electrically connected, and the connection mode is simple.
Besides the technical solutions disclosed in the present embodiment, for other structures of the coaxial connector 2, the coaxial line, the ridge waveguide coaxial converter, and the working principle thereof, etc., reference may be made to conventional technical solutions in the technical field, which are not the focus 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; "connected" may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "rear", and the like indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or unit must have a specific direction, be configured and operated in a specific orientation, and thus, should not be construed as limiting the present application.
In the description herein, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made to the present application by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (9)
1. A ridge waveguide coaxial converter comprising:
the waveguide structure comprises a ridge waveguide body, wherein a waveguide cavity is arranged in the ridge waveguide body, a waveguide end face is arranged at the rear end of the ridge waveguide body, a through hole is formed in the rear end of the waveguide end face, the through hole extends forwards and is communicated with the waveguide cavity, a waveguide port is formed by opening the front end of the ridge waveguide body, an impedance matching waveguide ridge is arranged in the waveguide cavity and comprises a first impedance matching waveguide ridge and a second impedance matching waveguide ridge, the first impedance matching waveguide ridge is connected to the top wall of the waveguide cavity and protrudes downwards, and the second impedance matching waveguide ridge is over against the first impedance matching waveguide ridge, connected to the bottom wall of the waveguide cavity and protrudes upwards;
the waveguide is characterized in that the inner side of the waveguide end face is provided with an installation cavity, the installation cavity is arranged on the upper part of the waveguide end face opposite to the impedance matching waveguide ridge I, the installation cavity is communicated with the waveguide cavity and the through hole, and the bottom wall of the installation cavity is a plane to form an installation plane; or the mounting cavity is arranged at the lower part of the end surface of the waveguide opposite to the second impedance matching waveguide ridge, the mounting cavity is communicated with the waveguide cavity and the through hole, and the top wall of the mounting cavity is planar to form a mounting plane;
further comprising:
the coaxial connector is installed at the rear end of the waveguide end face and comprises a coaxial inner conductor, a coaxial medium and a coaxial outer conductor, the coaxial inner conductor penetrates through the through hole to extend forwards to form an extending end, the extending end of the coaxial inner conductor is connected with the rear end of the first impedance matching waveguide ridge or the rear end of the second impedance matching waveguide ridge, the coaxial medium penetrates through the through hole to extend forwards to form an extending end, a connecting plane which is sunken towards the inner side of the coaxial medium is arranged on the outer side wall of the extending end of the coaxial medium and right faces the installation plane, the connecting plane is connected with the installation plane in an attaching mode, the coaxial inner conductor, the coaxial medium and the installation plane form a quasi-microstrip transmission structure, and the coaxial outer conductor is connected with the rear end of the waveguide end face;
the installation cavity is located the upper portion of waveguide terminal surface, the mounting surface with the rear end top parallel and level of impedance matching waveguide ridge two, perhaps the installation cavity is located the lower part of waveguide terminal surface, the mounting surface with the rear end bottom parallel and level of impedance matching waveguide ridge one.
2. The ridge waveguide coaxial converter of claim 1, wherein the upper side of the ridge waveguide body is an upper waveguide broad side, the lower side of the ridge waveguide body is a lower waveguide broad side, the left sides of the upper waveguide broad side and the lower waveguide broad side are connected with a left waveguide narrow side, the right sides of the upper waveguide broad side and the lower waveguide broad side are connected with a right waveguide narrow side, and the upper waveguide broad side, the lower waveguide broad side, the left waveguide narrow side, the right waveguide narrow side and the waveguide end face define the waveguide cavity therebetween;
the first impedance matching waveguide ridge is of a multi-stage stepped structure, is connected to the wide edge of the upper waveguide and protrudes downwards, and is gradually increased from the front to the center of the backward waveguide cavity;
the second impedance matching waveguide ridge is of a multi-stage stepped structure, the second impedance matching waveguide ridge is connected to the lower waveguide wide edge and protrudes upwards, the second impedance matching waveguide ridge is gradually increased from the front to the center of the backward waveguide cavity, and the second impedance matching waveguide ridge and the first impedance matching waveguide ridge are arranged in a mirror symmetry mode.
3. The ridge waveguide coaxial converter of claim 2, wherein the first impedance matching waveguide ridge of the multi-step structure comprises a first impedance matching protrusion I, a second impedance matching protrusion I, a third impedance matching protrusion I and a fourth impedance matching protrusion I, and the first impedance matching protrusion I, the second impedance matching protrusion I, the third impedance matching protrusion I and the fourth impedance matching protrusion I are sequentially connected from front to back;
the second impedance matching waveguide ridge of the multistage stepped structure comprises a second first-stage impedance matching protrusion, a second third-stage impedance matching protrusion and a second fourth-stage impedance matching protrusion, and the second first-stage impedance matching protrusion, the second third-stage impedance matching protrusion and the second fourth-stage impedance matching protrusion are sequentially connected from front to back.
4. The ridge waveguide coaxial converter of claim 3, wherein the first and second first impedance matching bumps have a height of 0.1 λ o, the second and second impedance matching bumps have a height of 0.105 λ o, the third and third impedance matching bumps have a height of 0.137 λ o, the fourth and fourth impedance matching bumps have a height of 0.165 λ o, and λ o is a wavelength corresponding to the center frequency.
5. The ridge waveguide coaxial converter of claim 3, wherein the width of the second impedance matching protrusion in the left-right direction is not greater than the width of the first impedance matching protrusion, the width of the third impedance matching protrusion in the left-right direction is not greater than the width of the second impedance matching protrusion, and the width of the fourth impedance matching protrusion in the left-right direction is less than the width of the third impedance matching protrusion.
6. The ridge waveguide coaxial converter according to any one of claims 2 to 5, wherein the width of the mounting plane in the left-right direction is larger than the width of the first impedance matching waveguide ridge and smaller than the width of the waveguide cavity.
7. The ridge waveguide coaxial converter of claim 6, wherein the first impedance matching waveguide ridge, the second impedance matching waveguide ridge and the mounting cavity are symmetrically arranged with respect to a vertical center plane of the waveguide cavity in a left-right direction, respectively.
8. The ridge waveguide coaxial converter according to any one of claims 1 to 5, wherein a flange is connected to a front end of the waveguide port.
9. The ridge waveguide coaxial converter according to any one of claims 1 to 5, wherein the extended end of the coaxial inner conductor is stopped at the rear end of the first impedance matching waveguide ridge or the rear end of the second impedance matching waveguide ridge.
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