CN115051133A - Waveguide broadside broadband coupling bridge - Google Patents
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- CN115051133A CN115051133A CN202210848290.XA CN202210848290A CN115051133A CN 115051133 A CN115051133 A CN 115051133A CN 202210848290 A CN202210848290 A CN 202210848290A CN 115051133 A CN115051133 A CN 115051133A
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- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P5/00—Coupling devices of the waveguide type
- H01P5/12—Coupling devices having more than two ports
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Abstract
The invention discloses a waveguide broadside broadband coupling bridge, and relates to the technical field of coupling bridges. The bridge comprises an upper shell, a middle plate and a lower shell, wherein a first waveguide coupling cavity is formed between the upper shell and the middle plate, two ports of the first waveguide coupling cavity are located on the long side face of the same side of the rectangular wide-side coupling bridge, a second waveguide coupling cavity is formed between the middle plate and the lower shell, two ports of the second waveguide coupling cavity are located on the long side face of the other side of the rectangular wide-side coupling bridge, the middle parts of the first waveguide coupling cavity and the second waveguide coupling cavity are overlapped in the vertical projection direction, the overlapped parts are arranged along the wide side of the coupling bridge, and the first waveguide coupling cavity and the second waveguide coupling cavity are in coupling communication through a coupling hole located on the middle plate. The bridge has the advantages of simple structure, wide working bandwidth and the like.
Description
Technical Field
The invention relates to the technical field of coupling bridges, in particular to a waveguide broadside broadband coupling bridge.
Background
The waveguide 3dB bridge is a microwave element widely applied to a radar feeder line, a satellite ground station feeder line and microwave test equipment. And can be divided into narrow-side coupling and wide-side coupling. The narrow-side coupling type can be classified into a capacitive matching type and an inductive matching type. Broadside coupling can be divided into the no inner conductor type and the inner conductor type. For radar and communication systems, the increase of the system output power means that the system has a larger action radius and stronger interference resistance. The output power generated in the millimeter-wave band is limited by the device fabrication process, impedance matching, and device heat dissipation.
Disclosure of Invention
The invention aims to solve the technical problem of how to provide a waveguide broadside broadband coupling bridge which is simple in structure and can widen the working bandwidth.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: a waveguide broadside broadband coupling bridge, comprising: the whole structure of the wide-side coupling bridge is a cuboid and comprises an upper shell of a cuboid structure, a middle plate of a cuboid structure and a lower shell of a cuboid structure, wherein the upper shell, the middle plate and the lower shell are sequentially fixed together from top to bottom, a first waveguide coupling cavity is formed between the upper shell and the middle plate, two ports of the first waveguide coupling cavity are located on the long side face of the same side of the rectangular wide-side coupling bridge, a second waveguide coupling cavity is formed between the middle plate and the lower shell, two ports of the second waveguide coupling cavity are located on the long side face of the other side of the rectangular wide-side coupling bridge, the middle parts of the first waveguide coupling cavity and the second waveguide coupling cavity are overlapped in the vertical projection direction, the overlapped parts are arranged along the wide side of the coupling bridge, and the first waveguide coupling cavity and the second waveguide coupling cavity are coupled and communicated through coupling holes located in the middle plate .
The further technical scheme is as follows: the lower surface of the upper shell is provided with an upper first coupling groove, the upper surface of the middle plate corresponding to the upper first coupling groove is provided with a lower first coupling groove, and the upper first coupling groove and the lower first coupling groove are oppositely arranged to form the first waveguide coupling cavity.
The further technical scheme is as follows: go up first coupling groove with the overall structure of first coupling groove is the U type down, and two structures are similar, and the both ends opening of going up first coupling groove is located on the leading flank of last casing, the both ends opening of first coupling groove is located down on the leading flank of intermediate lamella, it includes first linkage segment, second linkage segment and third linkage segment to go up first coupling groove, and first linkage segment and third linkage segment are followed the minor face direction of last casing sets up, the second linkage segment is followed the long edge direction of last casing sets up, the width of first linkage segment and third linkage segment at first keeps unchangeable back and reduces gradually again and keeps unchangeable, the width of second linkage segment is unchangeable, connect through the form of radius angle between first linkage segment and the second linkage segment and between second linkage segment and the third linkage segment.
The further technical scheme is as follows: the lower surface of intermediate lamella is formed with second coupling groove, with it is corresponding to go up the second coupling groove the upper surface of casing is formed with down second coupling groove down, go up the second coupling groove with constitute after the second coupling groove sets up relatively down second waveguide coupling chamber, the coupling hole is located down the centre in first coupling groove, and pass through the coupling hole makes down first coupling groove with it is linked together to go up the second coupling groove.
The further technical scheme is as follows: go up the second coupling groove with the overall structure of lower second coupling groove is the U type, and two structures are similar, and the both ends opening of going up the second coupling groove is located on the trailing flank of intermediate lamella, the both ends opening of second coupling groove is located down on the trailing flank of casing, down the second coupling groove includes fourth linkage segment, fifth linkage segment and sixth linkage segment, and fourth linkage segment and sixth linkage segment are followed the minor face direction of casing sets up down, the second linkage segment is followed the long edge direction of casing sets up down, the width of fourth linkage segment and sixth linkage segment keeps unchanged again after keeping unchanged at first reducing gradually again, the width of fourth linkage segment is unchangeable, connect through the form of fillet between fourth linkage segment and the fifth linkage segment and between fifth linkage segment and the sixth linkage segment.
The further technical scheme is as follows: the parts of the first waveguide coupling cavity and the second waveguide coupling cavity extending inwards from the openings at the two ends are processed in a mode of narrowing the inner diameter, so that the cavities at the end parts at the two sides are gradually reduced from outside to inside.
The invention also discloses a waveguide broadside broadband coupling bridge, which is characterized in that: the whole structure of the wide-side coupling bridge is a cuboid and comprises an upper shell with a cuboid structure, a middle plate with a cuboid structure and a lower shell with a cuboid structure, wherein the upper shell, the middle plate and the lower shell are sequentially fixed together from top to bottom, a first waveguide coupling cavity is formed between the upper shell and the middle plate, two ports of the first waveguide coupling cavity are respectively positioned on the short side surfaces of two sides of the rectangular wide-side coupling bridge, a second waveguide coupling cavity is formed between the middle plate and the lower shell, and two ports of the second waveguide coupling cavity are respectively positioned on the short side surfaces of two sides of the rectangular wide-side coupling bridge; the middle parts of the first waveguide coupling cavity and the second waveguide coupling cavity are overlapped in the vertical projection direction, the overlapped parts are arranged along the wide sides of the coupling bridge, and the first waveguide coupling cavity and the second waveguide coupling cavity are communicated in a coupling mode through coupling holes in the middle plate.
The invention also discloses a waveguide broadside broadband coupling bridge, which is characterized in that: the whole structure of the wide-side coupling bridge is a cuboid and comprises an upper shell with a cuboid structure, a middle plate with a cuboid structure and a lower shell with a cuboid structure, wherein the upper shell, the middle plate and the lower shell are sequentially fixed together from top to bottom, a first waveguide coupling cavity is formed between the upper shell and the middle plate, one port of two ports of the first waveguide coupling cavity is located on one short side surface of the rectangular wide-side coupling bridge, the other port of the two ports of the first waveguide coupling cavity is located on one long side surface of the rectangular wide-side coupling bridge, a second waveguide coupling cavity is formed between the middle plate and the lower shell, one port of the two ports of the second waveguide coupling cavity is located on one short side surface of the rectangular wide-side coupling bridge, and the other port of the two ports of the second waveguide coupling cavity is located on one long side surface of the rectangular wide-side coupling bridge; the middle parts of the first waveguide coupling cavity and the second waveguide coupling cavity are overlapped in the vertical projection direction, the overlapped parts are arranged along the wide sides of the coupling bridge, and the first waveguide coupling cavity and the second waveguide coupling cavity are communicated in a coupling mode through coupling holes in the middle plate.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in: according to the waveguide cavity, the bridge structure adopts broadside (broadside refers to the length of a rectangular bridge) coupling, and the waveguide cavity is transited from a standard waveguide size to a small waveguide size (the inner diameter of the cavity is gradually reduced), so that the working bandwidth can be widened, and the bandwidth greatly exceeds the bandwidth of a traditional bridge. By controlling the size, the number and the arrangement mode of the coupling holes, indexes such as coupling degree, directivity, phase position, amplitude flatness and the like can reach good states. In addition, the upper and lower overlapping setting of broadside portion in two coupling waveguide cavities in this application has consequently reduced the width of coupling bridge, and then can reduce its size.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
FIG. 1 is a schematic structural diagram of a first waveguide coupling cavity and a second waveguide coupling cavity inside the coupling bridge according to an embodiment of the present invention;
FIG. 2 is a schematic perspective structural view of a first waveguide cavity and a second waveguide cavity in the coupling bridge according to an embodiment of the present invention;
FIG. 3 is a schematic perspective view of the coupling bridge according to one embodiment of the present invention;
FIG. 4 is a schematic perspective view of the coupling bridge according to one embodiment of the present invention;
FIG. 5 is a schematic perspective view of the coupling bridge according to one embodiment of the present invention;
fig. 6 is a schematic perspective view of the coupling bridge according to an embodiment of the present invention;
FIG. 7 is a schematic side view of the coupling bridge according to one embodiment of the present invention;
FIG. 8 is a schematic structural diagram of a middle plate of the coupling bridge according to one embodiment of the present invention;
FIG. 9 is a schematic structural diagram of an upper housing (a lower housing) of the coupling bridge according to one embodiment of the present invention;
FIG. 10 is an exploded view of the coupling bridge according to one embodiment of the present invention;
FIG. 11 is a schematic structural diagram of a first waveguide cavity and a second waveguide cavity in a second coupling bridge according to a second embodiment of the present invention;
FIG. 12 is a schematic structural diagram of a first waveguide coupling cavity and a second waveguide coupling cavity inside a coupling bridge according to a third embodiment of the present invention;
FIG. 13 is a schematic structural diagram of a first waveguide cavity and a second waveguide cavity in a coupling bridge according to the fourth embodiment of the present invention;
wherein: 1. an upper housing; 2. a middle plate; 3. a lower housing; 4. a first waveguide coupling cavity; 5. a second waveguide coupling cavity; 6. a coupling hole; 7. an upper first coupling groove; 7-1, a first connecting section; 7-2, a second connecting section; 7-3, a third connecting section; 8. a lower first coupling groove; 9. an upper second coupling groove; 10. a lower second coupling groove; 10-1 and a fourth connecting section; 10-2, a fifth connecting section; 10-3 and a sixth connecting section.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those specifically described and will be readily apparent to those of ordinary skill in the art without departing from the spirit of the present invention, and therefore the present invention is not limited to the specific embodiments disclosed below.
Example one
As shown in fig. 1 to 10, an embodiment of the present invention discloses a waveguide broadside broadband coupling bridge, where the bridge may be a waveguide 3dB bridge, the overall structure of the broadside coupling bridge is a cuboid, and the bridge includes an upper casing 1 with a cuboid structure, a middle plate 2 with a cuboid structure, and a lower casing 3 with a cuboid structure, and the upper casing 1, the middle plate 2, and the lower casing 3 are all made of metal materials. The upper casing 1, the middle plate 2 and the lower casing 3 are fixed together sequentially from top to bottom by mutually matching screws, screw holes and the like. A first waveguide coupling cavity is formed between the upper housing 1 and the middle plate 2, two ports of the first waveguide coupling cavity 4 are located on the long side surface of the same side of the rectangular broadside coupling bridge, a second waveguide coupling cavity 5 is formed between the middle plate 2 and the lower housing 3, and two ports of the second waveguide coupling cavity 5 are located on the long side surface of the other side of the rectangular broadside coupling bridge, preferably, the ports outside the first waveguide coupling cavity 4 and the second waveguide coupling cavity 5 are standard WR28 interfaces, of course, the ports outside the waveguide coupling cavities can also be interfaces of other sizes, and those skilled in the art can make relevant selections according to use needs. In order to enable the two waveguide coupling cavities to have corresponding coupling effects, the middle parts of the first waveguide coupling cavity 4 and the second waveguide coupling cavity 5 are overlapped in the vertical projection direction, the overlapped parts are arranged along the wide sides of the coupling bridge, and the first waveguide coupling cavity 4 and the second waveguide coupling cavity 5 are in coupling communication through a coupling hole 6 on the middle plate 2.
Further, as shown in fig. 9 and 10, an upper first coupling groove 7 is formed on a lower surface of the upper housing 1, a lower first coupling groove 8 is formed on an upper surface of the middle plate 2 corresponding to the upper first coupling groove 7, and the upper first coupling groove 7 and the lower first coupling groove 8 are oppositely disposed to form the first waveguide coupling cavity 4. It should be noted that the structures of the upper housing 1 and the lower housing 3 are the same in this application, and different names are used for naming the upper housing and the lower housing for convenience of description.
Further, as shown in fig. 8 to 10, the overall structure of the upper first coupling groove 7 and the lower first coupling groove 8 is U-shaped, and the two structures are similar, the openings at the two ends of the upper first coupling groove 7 are located on the front side surface of the upper housing 1, and the openings at the two ends of the lower first coupling groove 8 are located on the front side surface of the middle plate 2. The upper first coupling groove 7 comprises a first connecting section 7-1, a second connecting section 7-2 and a third connecting section 7-3, the first connecting section 7-1 and the third connecting section 7-3 are arranged along the short side direction of the upper shell 2, the second connecting section 7-2 is arranged along the long side direction of the upper shell 2, and the widths of the first connecting section 7-1 and the third connecting section 7-3 from outside to inside are firstly kept unchanged, then gradually reduced and finally kept unchanged; the width of the second connecting section 7-2 is unchanged, and the first connecting section 7-1 and the second connecting section 7-2 and the third connecting section 7-3 are connected in a fillet mode.
Different from the traditional narrow-side coupling mode, the broadband coupling mode is adopted, the waveguide cavity is transited from the standard waveguide size to the small waveguide size, the working bandwidth can be widened, and the bandwidth greatly exceeds the bandwidth of a traditional electric bridge. The coupling mode of the bridge structure is broadside coupling, the output port needs to use the size of standard WR28, but the working frequency band is higher, so the size of the rectangular waveguide is reduced at the coupling hole structure part to match the working bandwidth.
Further, as shown in fig. 7 to 9, of the three sides of the first connecting section 7-1 and the third connecting section 7-3, the side on the outer side is kept vertical, and the other two sides are partially inclined, so that the outer side port of the waveguide cavity is in a necking form.
Further, as shown in fig. 8 and 10, an upper second coupling groove 9 is formed on a lower surface of the middle plate 2, a lower second coupling groove 10 is formed on an upper surface of the lower housing 3 corresponding to the upper second coupling groove 9, the upper second coupling groove 9 and the lower second coupling groove 10 are oppositely disposed to form the second waveguide coupling cavity 5, the coupling hole 6 is located in the middle of the lower first coupling groove 8, and the lower first coupling groove 7 is communicated with the upper second coupling groove 9 through the coupling hole 6.
Due to the need of miniaturization as much as possible in design, in order to reduce the longitudinal dimension and ensure that a sufficient electromagnetic field is coupled into the secondary line waveguide, it is necessary that the coupling hole area is large enough and the structure is simple and easy to process, and among various types of coupling holes, the rectangular coupling hole is the closest to the requirement. When the coupling hole is selected, the coupling hole is ensured to have a large enough area so that enough electromagnetic waves can be coupled into the secondary line waveguide, and the longitudinal size, the isolation index and the enough working bandwidth are also ensured. According to the principle of small hole coupling, the more the number of the coupling holes is, the better the isolation and the working bandwidth performance is, and the form of the coupling holes with 6 double rows of holes is selected after comprehensive consideration. Under the condition that the size and the number of the coupling holes are limited, the thickness of the coupling holes and the size of the side b of the waveguide can be reduced, so that the energy coupled into the secondary line waveguide can be effectively increased. Further, the coupling holes 6 are arranged in the middle of the lower first coupling groove 8 in an array shape.
The waveguide bridge needs to be focused on the indexes such as coupling degree, isolation degree, amplitude/phase balance and the like. The influence degree of each parameter in the corresponding structure on different indexes is also different. The hole thickness mainly affects the coupling degree, and the hole spacing and the port excess length mainly affect the amplitude balance and the phase balance.
Further, as shown in fig. 10, the overall structure of the upper second coupling groove 9 and the lower second coupling groove 10 is U-shaped, and the two structures are similar, the two end openings of the upper second coupling groove 9 are located on the rear side of the middle plate 2, and the two end openings of the lower second coupling groove 10 are located on the rear side of the lower housing 3. The lower second coupling groove 10 comprises a fourth connecting section 10-1, a fifth connecting section 10-2 and a sixth connecting section 10-3, the fourth connecting section 10-1 and the sixth connecting section 10-3 are arranged along the short side direction of the lower shell 3, the second connecting section 10-2 is arranged along the long side direction of the lower shell 3, and the widths of the fourth connecting section 10-1 and the sixth connecting section 10-3 from outside to inside are firstly kept unchanged, then gradually reduced and finally kept unchanged; the width of the fourth connecting section 10-1 is unchanged, and the fourth connecting section 10-1 and the fifth connecting section 10-2 and the sixth connecting section 10-3 are connected in a fillet manner.
This application makes through setting up above structure first waveguide coupling cavity 4 and second waveguide coupling cavity 5 adopt the mode of constriction internal diameter to handle from the part of both ends opening inside extension, and then make the cavity of both sides tip reduce from outside to inside gradual change.
In summary, the bridge structure described in the present application adopts broadside (broadside refers to the length of a rectangular bridge) coupling, and the waveguide cavity is transitioned from the standard waveguide size to the small waveguide size (the inner diameter of the cavity is gradually reduced), so that the operating bandwidth can be widened, which greatly exceeds the bandwidth of the conventional bridge.
Example two
As shown in fig. 11, an embodiment of the present invention further discloses a waveguide broadside broadband coupling bridge, an overall structure of the broadside broadband coupling bridge is a cuboid, and the broadside broadband coupling bridge includes an upper casing 1 having a cuboid structure, a middle plate 2 having a cuboid structure, and a lower casing 3 having a cuboid structure, where the upper casing 1, the middle plate 2, and the lower casing 3 are sequentially fixed together from top to bottom, and a first waveguide coupling cavity is formed between the upper casing 1 and the middle plate 2. Two ports of the first waveguide coupling cavity 4 are respectively positioned on the short side surfaces at two sides of the rectangular wide-side coupling bridge, a second waveguide coupling cavity 5 is formed between the middle plate 2 and the lower shell 3, two ports of the second waveguide coupling cavity 5 are respectively positioned on the short side surfaces at two sides of the rectangular wide-side coupling bridge, two ports on the first waveguide coupling cavity 4 are arranged close to each other, and two ports on the second waveguide coupling cavity 5 are arranged close to each other; the middle parts of the first waveguide coupling cavity 4 and the second waveguide coupling cavity 5 are overlapped in the vertical projection direction, the overlapped parts are arranged along the wide sides of the coupling bridge, and the first waveguide coupling cavity 4 and the second waveguide coupling cavity 5 are in coupling communication through a coupling hole 6 on the middle plate 2. It should be noted that the present embodiment is mainly different from the first embodiment in that: the port position on the first waveguide coupling cavity 4 is different from the port position on the second waveguide coupling cavity 5, and other structures are similar to the structure of the embodiment and are not described herein again.
EXAMPLE III
As shown in fig. 12, the embodiment of the present invention discloses a waveguide broadside broadband coupling bridge, the overall structure of which is a cuboid, and which includes an upper casing 1 having a cuboid structure, a middle plate 2 having a cuboid structure, and a lower casing 3 having a cuboid structure, where the upper casing 1, the middle plate 2, and the lower casing 3 are fixed together from top to bottom in sequence. A first waveguide coupling cavity is formed between the upper shell 1 and the middle plate 2, one of two ports of the first waveguide coupling cavity 4 is located on a short-side surface on the left side of the rectangular broadside coupling bridge, the other port is located on a long-side surface on the front side of the rectangular broadside coupling bridge, a second waveguide coupling cavity 5 is formed between the middle plate 2 and the lower shell 3, one of two ports of the second waveguide coupling cavity 5 is located on the short-side surface on the left side of the rectangular broadside coupling bridge, and the other port is located on a long-side surface on the back side of the rectangular broadside coupling bridge; the middle parts of the first waveguide coupling cavity 4 and the second waveguide coupling cavity 5 are overlapped in the vertical projection direction, the overlapped parts are arranged along the wide sides of the coupling bridge, and the first waveguide coupling cavity 4 and the second waveguide coupling cavity 5 are in coupling communication through a coupling hole 6 on the middle plate 2. It should be noted that the present embodiment is mainly different from the first embodiment in that: the port position on the first waveguide coupling cavity 4 is different from the port position on the second waveguide coupling cavity 5, and other structures are similar to the structure of the embodiment and are not described herein again.
Example four
As shown in fig. 13, the embodiment of the present invention discloses a waveguide broadside broadband coupling bridge, the overall structure of which is a cuboid, and which includes an upper casing 1 having a cuboid structure, a middle plate 2 having a cuboid structure, and a lower casing 3 having a cuboid structure, where the upper casing 1, the middle plate 2, and the lower casing 3 are fixed together from top to bottom in sequence. A first waveguide coupling cavity is formed between the upper shell 1 and the middle plate 2, one port of two ports of the first waveguide coupling cavity 4 is located on a short side face on the left side of the rectangular broadside coupling bridge, the other port of the two ports of the first waveguide coupling cavity is located on a long side face on the front side of the rectangular broadside coupling bridge, a second waveguide coupling cavity 5 is formed between the middle plate 2 and the lower shell 3, one port of two ports of the second waveguide coupling cavity 5 is located on a short side face on the right side of the rectangular broadside coupling bridge, and the other port of the two ports of the second waveguide coupling cavity 5 is located on a long side face on the front side of the rectangular broadside coupling bridge; the middle parts of the first waveguide coupling cavity 4 and the second waveguide coupling cavity 5 are overlapped in the vertical projection direction, the overlapped parts are arranged along the wide sides of the coupling bridge, and the first waveguide coupling cavity 4 and the second waveguide coupling cavity 5 are in coupling communication through a coupling hole 6 on the middle plate 2. It should be noted that the present embodiment is mainly different from the first embodiment in that: the port position on the first waveguide coupling cavity 4 is different from the port position on the second waveguide coupling cavity 5, and other structures are similar to the structure of the embodiment and are not described herein again.
Claims (10)
1. A waveguide broadside broadband coupling bridge, comprising: the whole structure of the wide-side coupling bridge is a cuboid and comprises an upper shell (1) with a cuboid structure, a middle plate (2) with a cuboid structure and a lower shell (3) with a cuboid structure, the upper shell (1), the middle plate (2) and the lower shell (3) are sequentially fixed together from top to bottom, a first waveguide coupling cavity is formed between the upper shell (1) and the middle plate (2), two ports of the first waveguide coupling cavity (4) are located on the long-side face of the same side of the rectangular wide-side coupling bridge, a second waveguide coupling cavity (5) is formed between the middle plate (2) and the lower shell (3), and two ports of the second waveguide coupling cavity (5) are located on the long-side face of the other side of the rectangular wide-side coupling bridge; the middle parts of the first waveguide coupling cavity (4) and the second waveguide coupling cavity (5) are overlapped in the vertical projection direction, the overlapped parts are arranged along the wide sides of the coupling bridge, and the first waveguide coupling cavity (4) and the second waveguide coupling cavity (5) are in coupling communication through a coupling hole (6) in the middle plate (2).
2. The waveguide broadside broadband coupling bridge of claim 1, wherein: the lower surface of the upper shell (1) is provided with an upper first coupling groove (7), the upper surface of the middle plate (2) corresponding to the upper first coupling groove (7) is provided with a lower first coupling groove (8), and the upper first coupling groove (7) and the lower first coupling groove (8) are oppositely arranged to form the first waveguide coupling cavity (4).
3. The waveguide broadside broadband coupling bridge of claim 2, wherein: the integral structure of the upper first coupling groove (7) and the lower first coupling groove (8) is U-shaped, the two structures are similar, the openings at two ends of the upper first coupling groove (7) are positioned on the front side surface of the upper shell (1), the openings at two ends of the lower first coupling groove (8) are positioned on the front side surface of the middle plate (2), the upper first coupling groove (7) comprises a first connecting section (7-1), a second connecting section (7-2) and a third connecting section (7-3), the first connecting section (7-1) and the third connecting section (7-3) are arranged along the short side direction of the upper shell (2), the second connecting section (7-2) is arranged along the long side direction of the upper shell (2), and the widths of the first connecting section (7-1) and the third connecting section (7-3) from outside to inside are kept unchanged at first, then gradually reducing, and finally keeping unchanged; the width of the second connecting section (7-2) is unchanged, and the first connecting section (7-1) is connected with the second connecting section (7-2) and the second connecting section (7-2) is connected with the third connecting section (7-3) in a rounding angle mode.
4. The waveguide broadside broadband coupling bridge of claim 2, wherein: the lower surface of intermediate plate (2) is formed with second coupling groove (9) on, with it is corresponding to go up second coupling groove (9) the upper surface of lower casing (3) is formed with down second coupling groove (10), go up second coupling groove (9) with second coupling groove (10) set up the back relatively down and constitute second waveguide coupling chamber (5), coupling hole (6) are located the centre of lower first coupling groove (8), and pass through coupling hole (6) make down first coupling groove (7) with last second coupling groove (9) are linked together.
5. The waveguide broadside broadband coupling bridge of claim 4, wherein: the integral structure of the upper second coupling groove (9) and the lower second coupling groove (10) is U-shaped, the two structures are similar, the openings at two ends of the upper second coupling groove (9) are positioned on the rear side surface of the middle plate (2), the openings at two ends of the lower second coupling groove (10) are positioned on the rear side surface of the lower shell (3), the lower second coupling groove (10) comprises a fourth connecting section (10-1), a fifth connecting section (10-2) and a sixth connecting section (10-3), the fourth connecting section (10-1) and the sixth connecting section (10-3) are arranged along the short side direction of the lower shell (3), the second connecting section (10-2) is arranged along the long side direction of the lower shell (3), and the widths of the fourth connecting section (10-1) and the sixth connecting section (10-3) from outside to inside are firstly kept unchanged, then gradually reducing, and finally keeping unchanged; the width of the fourth connecting section (10-1) is unchanged, and the fourth connecting section (10-1) is connected with the fifth connecting section (10-2) and the fifth connecting section (10-2) is connected with the sixth connecting section (10-3) in a fillet mode.
6. The waveguide broadside broadband coupling bridge of claim 4, wherein: the coupling holes (6) are rectangular holes and are arranged in the middle of the lower first coupling groove (8) in an array shape; and the two ports on the outer side of the first waveguide coupling cavity (4) and the two ports on the outer side of the second waveguide coupling cavity (5) are standard waveguide interfaces.
7. The waveguide broadside broadband coupling bridge of claim 6, wherein: the coupling holes (6) are provided with two rows and three columns; the upper shell (1), the middle plate (2) and the lower shell (3) are fixed together through screws.
8. The waveguide broadside broadband coupling bridge of claim 1, wherein: the parts of the first waveguide coupling cavity (4) and the second waveguide coupling cavity (5) extending inwards from the openings at the two ends are treated in a mode of narrowing the inner diameter, so that the cavities at the end parts at the two sides are gradually reduced from outside to inside.
9. A waveguide broadside broadband coupling bridge, comprising: the whole structure of the wide-side coupling bridge is a cuboid and comprises an upper shell (1) with a cuboid structure, a middle plate (2) with a cuboid structure and a lower shell (3) with a cuboid structure, the upper shell (1), the middle plate (2) and the lower shell (3) are sequentially fixed together from top to bottom, a first waveguide coupling cavity is formed between the upper shell (1) and the middle plate (2), two ports of the first waveguide coupling cavity (4) are respectively located on the short side surfaces of two sides of the rectangular wide-side coupling bridge, a second waveguide coupling cavity (5) is formed between the middle plate (2) and the lower shell (3), and two ports of the second waveguide coupling cavity (5) are respectively located on the short side surfaces of two sides of the rectangular wide-side coupling bridge; the middle parts of the first waveguide coupling cavity (4) and the second waveguide coupling cavity (5) are overlapped in the vertical projection direction, the overlapped parts are arranged along the wide sides of the coupling bridge, and the first waveguide coupling cavity (4) and the second waveguide coupling cavity (5) are in coupling communication through a coupling hole (6) in the middle plate (2).
10. A waveguide broadside broadband coupling bridge, comprising: the whole structure of the wide-side coupling bridge is a cuboid and comprises an upper shell (1) with a cuboid structure, a middle plate (2) with a cuboid structure and a lower shell (3) with a cuboid structure, the upper shell (1), the middle plate (2) and the lower shell (3) are sequentially fixed together from top to bottom, a first waveguide coupling cavity is formed between the upper shell (1) and the middle plate (2), one port of two ports of the first waveguide coupling cavity (4) is positioned on one short side surface of the rectangular wide-side coupling bridge, the other port of the two ports of the first waveguide coupling cavity is positioned on one long side surface of the rectangular wide-side coupling bridge, a second waveguide coupling cavity (5) is formed between the middle plate (2) and the lower shell (3), and one port of the two ports of the second waveguide coupling cavity (5) is positioned on one short side surface of the rectangular wide-side coupling bridge, the other port is positioned on one long side face of the rectangular wide-side coupling bridge; the middle parts of the first waveguide coupling cavity (4) and the second waveguide coupling cavity (5) are overlapped in the vertical projection direction, the overlapped parts are arranged along the wide sides of the coupling bridge, and the first waveguide coupling cavity (4) and the second waveguide coupling cavity (5) are in coupling communication through a coupling hole (6) in the middle plate (2).
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