JP2024032076A - Waveguide, transmitter, and method for manufacturing waveguide - Google Patents

Abstract

The present invention provides a waveguide that can effectively suppress radio wave leakage. [Solution] A waveguide includes a metal block in which a recess for radio wave propagation is formed on one surface, and a metal cover that contacts one surface of the block and covers the recess. A convex ridge is formed on one surface of the cover along the edge of the recess, and the hardness of the cover is the same as or softer than that of the block, and the ridge of the block bites into the cover. [Selection diagram] Figure 2

Description

The present invention relates to a waveguide, a transmitter, and a method for manufacturing a waveguide.

A technique is known in which a waveguide is constructed by combining metal blocks divided along a vertical section. While this type of waveguide is advantageous in terms of manufacturing, it requires measures against radio wave leakage (electrical loss) from the gap between the opposing surfaces of the two assembled metal blocks.

Patent Document 1 discloses that protrusions are formed near the grooves on the opposing surface of one metal block by applying silver plating or using a metal block or other member, and A technique for eliminating gaps between surfaces has been disclosed.

Japanese Patent Application Laid-Open No. 50-122846

However, in the technique disclosed in Patent Document 1, the flatness of the surface of the formed protrusions poses a new problem, and there is a limit to completely eliminating the gap.

The present invention has been made in view of the above problems, and its main purpose is to provide a waveguide, a transmitter, and a method for manufacturing a waveguide that can effectively suppress radio wave leakage. There is a particular thing.

In order to solve the above problems, a waveguide according to one aspect of the present invention includes a metal block in which a recess for radio wave propagation is formed on one surface, and a metal block in which a recess for radio wave propagation is in contact with the one surface of the block. a metal cover that covers the recess, a protrusion extending from the first surface along the edge of the recess is formed on the one surface of the block, and the hardness of the cover is equal to or greater than the hardness of the block. The protrusion of the block bites into the cover at the same or softer than the block. According to this, it becomes possible to effectively suppress radio wave leakage.

In the above aspect, a groove may be formed on the one surface of the block along the edge of the recess, and the protrusion may be formed on one or both edges of the groove. According to this, it becomes possible to form the protrusions along with the grooves.

In the above aspect, the protruding strip may be formed in an endless shape surrounding the recess. According to this, it becomes possible to suppress radio wave leakage more effectively.

Further, a waveguide according to another aspect of the present invention includes a first block made of metal in which a first recess for radio wave propagation is formed on the first surface, and a second recess for radio wave propagation is formed in the second surface. sandwiched between the first block and the second block, in contact with the first surface of the first block, in contact with the second surface of the second block, and in contact with the second surface of the second block; a metal cover interposed between the first recess and the second recess; the first block has a metal cover that is raised from the first surface along an edge of the first recess; a second protruding strip is formed on the second surface of the second block, and a second protruding strip is formed on the second surface of the second block, protruding from the second surface along the edge of the second recess; The first protruding line of the first block and the second protruding line of the second block bite into the cover so as to be the same as or softer than the first and second blocks. According to this, it becomes possible to effectively suppress radio wave leakage.

In the above aspect, a first groove is formed on the first surface of the first block along an edge of the first recess, and the first protrusion is formed on one or both edges of the first groove. a second groove is formed on the second surface of the second block along an edge of the second recess, and the second protrusion is formed on one or both edges of the second groove, The first groove and the second groove may face each other with the cover interposed therebetween. According to this, it becomes possible to form the protrusions along with the grooves.

In the above aspect, the first protrusion is formed on a side closer to the edge of the first recess with respect to the first groove, and the second protrusion is also formed on the side of the second recess with respect to the second groove. It may be formed on the side closer to the edge. According to this, a strong contact portion can be formed by the first and second protrusions meshing on the sides closer to the first and second recesses, making it possible to more effectively suppress radio wave leakage.

In the above aspect, the first protrusion is formed on a side closer to the edge of the first recess with respect to the first groove, and the second protrusion is formed on a side of the second recess with respect to the second groove. It may be formed on the side far from the edge. According to this, a double contact portion can be formed by the first or second protrusion on the side near and far from the first and second recesses, and it becomes possible to suppress radio wave leakage more effectively. .

In the above aspect, the first protrusion may be formed on both sides of the first groove, and the second protrusion may also be formed on both sides of the second groove. According to this, the first and second protrusions mesh with each other on both the sides close to and far from the first and second recesses, thereby forming a double strong contact area and suppressing radio wave leakage more effectively. becomes possible.

Further, a transmitter according to another aspect of the present invention includes the above-mentioned waveguide. According to this, it becomes possible to provide a waveguide that effectively suppresses radio wave leakage.

In addition, in the method for manufacturing a waveguide according to another aspect of the present invention, a recess for radio wave propagation is formed on one surface of a metal block. A metal cover having a hardness equal to or softer than the block is formed with a raised protrusion from one surface, and is brought into contact with the one surface of the block, so that the protrusion of the block is Push it into the cover. According to this, it becomes possible to effectively suppress radio wave leakage.

In the above aspect, the protruding stripes may be formed on one or both edges of the groove when forming the groove along the edge of the recess on the one surface of the block by machining. According to this, it becomes possible to form the protrusions together with the grooves.

It is a diagram showing an example of the configuration of a radar. It is a figure showing an example of composition of a waveguide filter. It is a figure showing an example of composition of a waveguide filter. It is a figure showing an example of composition of a waveguide filter. It is a figure showing an example of composition of a waveguide filter. It is a figure showing an example of composition of a waveguide filter. It is a figure which shows the example of a structure of a groove|channel and a protrusion. It is a figure which shows the example of a structure of a groove|channel and a protrusion. It is a figure which shows the example of a structure of a groove|channel and a protrusion. It is a figure which shows the example of joining a block and a partition plate. It is a figure which shows the example of joining a block and a partition plate. It is a figure which shows the example of joining a block and a partition plate. It is a figure which shows the example of joining a block and a partition plate. It is a figure which shows the example of a procedure of the manufacturing method of a waveguide filter.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing an example configuration of radar 100. As shown in FIG. Radar 100 is a microwave transceiver that transmits and receives microwaves. The radar 100 includes a waveguide filter 1. The radar 100 is an example of a transmitter according to the embodiment, and the waveguide filter 1 is an example of a waveguide according to the embodiment.

In addition to the waveguide filter 1, the radar 100 includes a magnetron 91, a pulse drive circuit 92, a circulator 93, a terminator 94, a circulator 95, a rotary joint 96, an antenna 97, a limiter circuit 98, and a receiving circuit 99.

The magnetron 91 is a microwave generator that oscillates, for example, a 9.4 GHz microwave as a fundamental wave. The pulse drive circuit 92 drives the magnetron 91 intermittently at a predetermined period to generate a pulsed transmission signal. The circulator 93 switches the output destination of the pulsed transmission signal from the magnetron 91.

Waveguide filter 1 is interposed between magnetron 91 and antenna 97. In this embodiment, the waveguide filter 1 is configured as a bandpass filter, allowing passage of a fundamental wave and suppressing passage of harmonics with respect to the fundamental wave. The suppressed harmonics are consumed in a terminator 94 connected to a circulator 93.

Circulator 95 outputs the transmitted signal from waveguide filter 1 to antenna 97 and outputs the received signal from antenna 97 to receiving circuit 99. The rotary joint 96 is interposed between the antenna 97 and the circulator 95, and electrically connects the rotating system and the stationary system.

The antenna 97, while being rotated by a motor (not shown), transmits a transmission signal as a radio wave pulse and converts a received reflected wave into a reception signal. The limiter circuit 98 suppresses a high level received signal immediately after the start of reception. Receiving circuit 99 acquires a received signal from antenna 97.

The path from the magnetron 91 to the antenna 97 is composed of a waveguide. Further, the path from the antenna 97 to the limiter circuit 98 is also formed of a waveguide.

In this embodiment, the radar 100 to which the waveguide filter 1 is applied is a marine radar that transmits and receives microwaves, but is not limited to this, and is, for example, a vehicle-mounted radar that transmits and receives millimeter waves for obstacle detection or collision prevention. It may also be a radar or the like.

FIG. 2 is an exploded perspective view showing a configuration example of the waveguide filter 1. As shown in FIG. The waveguide filter 1 includes two blocks 2 and 3 and a partition plate 4 sandwiched between them.

FIG. 3 is a diagram showing an example of the configuration of the block 2, and is a diagram of the block 2 viewed from the partition plate 4 side. FIG. 4 is a diagram showing an example of the configuration of the block 3, and is a diagram of the block 3 viewed from the partition plate 4 side.

FIG. 5 is a diagram showing an example of the configuration of the partition plate 4, and is a diagram of the partition plate 4 viewed from the block 3 side. FIG. 6 is a diagram showing a cross section of the block 2 taken along the line VI-VI shown in FIG.

The Z direction in the figure represents the thickness direction or stacking direction of the blocks 2 and 3 and the partition plate 4. The X direction and the Y direction represent the lateral direction and longitudinal direction of the blocks 2 and 3 and the partition plate 4, respectively, in a plane orthogonal to the Z direction.

The blocks 2 and 3 and the partition plate 4 are made of metal. Specifically, the blocks 2 and 3 are made of a conductive metal material such as aluminum. The partition plate 4 is also made of a conductive metal material such as an aluminum alloy.

The blocks 2 and 3 sandwich the partition plate 4, with the opposing surface 29 of the block 2 in contact with one main surface of the partition plate 4, and the opposing surface 39 of the block 3 in contact with the other main surface of the partition plate 4. The blocks 2 and 3 and the partition plate 4 are fastened together by fastening members such as screws (not shown).

As shown in FIG. 3, a recess 20 for radio wave propagation is formed in the opposing surface 29 of the block 2. The recess 20 includes two resonance regions 21 and 22 arranged in the Y direction and a coupling window 23 interposed between them. The resonance region 22 has additional regions 221 and 222 for adjusting harmonics.

A coupling window 25 is formed at the bottom of the resonant region 21 of the block 2 to communicate the resonant region 21 with the outside. An input waveguide line 82 (see FIG. 2) is connected to the coupling window 25, and radio waves are input from the waveguide line 82 to the resonance region 21 through the coupling window 25.

As shown in FIG. 4, a recess 30 for radio wave propagation is formed in the opposing surface 39 of the block 3. The recess 30 includes two resonance regions 31 and 32 arranged in the Y direction and a coupling window 33 interposed between them. The resonance region 31 has additional regions 311 and 312 for adjusting harmonics.

A coupling window 35 is formed at the bottom of the resonant region 32 of the block 3 to communicate the resonant region 32 with the outside. An output waveguide line 83 (see FIG. 2) is connected to the coupling window 35, and radio waves are output from the resonance region 32 to the waveguide line 83 through the coupling window 35.

As shown in FIG. 5, a plurality of coupling windows 41-45 are formed in the partition plate 4. The partition plate 4 is sandwiched between the blocks 2 and 3 and is interposed between the recesses 20 and 30. That is, the partition plate 4 covers both the recess 20 and the recess 30. In this embodiment, the recesses 20 and 30 have a mirror-symmetrical relationship.

The coupling windows 41-44 communicate the resonant region 22 of block 2 and the resonant region 31 of block 3. The coupling window 45 allows the resonance region 21 of the block 2 and the resonance region 32 of the block 3 to communicate with each other.

By assembling and fastening the blocks 2, 3 and the partition plate 4, each resonance region 21, 22, 31, 32 functions as a waveguide type resonator. In this embodiment, the waveguide filter 1 includes a total of four waveguide resonators. Each resonance region 21, 22, 31, 32 has a predetermined dimension determined based on the frequency of the radio wave (electromagnetic wave) used.

Radio waves from the input waveguide line 82 propagate to the resonance region 21 through the coupling window 25, propagate from the resonance region 21 to the resonance region 22 through the coupling window 23, and from the resonance region 22 through the coupling windows 41-44. It propagates to the resonant region 31 , from the resonant region 31 to the resonant region 32 through the coupling window 33 , and is finally outputted from the resonant region 32 through the coupling window 35 to the output waveguide line 83 . Further, some of the radio waves also propagate from the resonance region 21 to the resonance region 32 through the coupling window 45 .

Each of the resonance regions 21, 22, 31, and 32 has a flat shape in which the dimension in the Z direction is shorter than the dimension in the X direction and the Y direction, and causes received radio waves to resonate in the TE mode. The electric field vector of the resonant radio waves points in the Z direction. Note that each resonance region 21, 22, 31, 32 propagates a single mode radio wave.

By the way, in general, in a waveguide structure in which multiple members are combined to form a cavity for radio wave propagation, minute gaps are created where the members are joined together, so radio waves leak through these gaps, resulting in poor performance. There is a problem that deterioration and dispersion easily occur.

Therefore, in this embodiment, the opposing surfaces 29 and 39 of the blocks 2 and 3 are shaped as shown below, thereby suppressing minute gaps and making it possible to effectively suppress radio wave leakage.

As shown in FIG. 3, the opposing surface 29 (first surface) on which the recess 20 (first recess) of the block 2 (first block) is formed has a groove 24 (first groove ) is formed. The groove 24 is formed in an endless shape surrounding the recess 20. Specifically, the groove 24 is formed parallel to the edge of the recess 20 at a certain distance away from the edge of the recess 20 . The distance from the edge of the recess 20 to the groove 24 is, for example, about 0.1 mm or more and 1 mm or less.

Similarly, as shown in FIG. 4, a groove 34 ( A second groove) is formed. The groove 34 is formed in an endless shape surrounding the recess 30. Specifically, the groove 34 is formed parallel to the edge of the recess 30 at a certain distance away from the edge of the recess 30 . The distance from the edge of the recess 30 to the groove 34 is, for example, about 0.1 mm or more and 1 mm or less.

In this embodiment, the grooves 24 and 34 formed around the recesses 20 and 30 also have a mirror-symmetrical relationship like the recesses 20 and 30. Therefore, when the blocks 2 and 3 and the partition plate 4 are assembled, the grooves 24 and 34 face each other with the partition plate 4 in between, that is, are aligned in the Z direction.

7 to 9 are partially enlarged views of the groove 24 formed around the recess 20 of the block 2 and the vicinity thereof.

Groove 24 is formed by machining. That is, the groove 24 is formed by groove machining using a tool. When forming the groove 24 by machining, along with the groove 24 recessed from the opposing surface 29, protrusions 241 and 242 (first protrusions) protruding from the opposing surface 29 are formed on one or both edges of the groove 24. .

The protrusions 241 and 242 are continuous raised portions, and are elongated portions that are raised relative to the opposing surface 29. The protrusions 241 and 242 are formed along the edge of the recess 20 similarly to the groove 24. That is, the protrusions 241 and 242 are formed in an endless shape surrounding the recess 20.

The example in FIG. 7 is an example in which a protrusion 241 is formed on the side of the groove 24 that is closer to the edge of the recess 20, and no protrusion is formed on the side of the groove 24 that is farther from the edge of the recess 20. .

The example in FIG. 8 is an example in which a protruding line 241 is formed on the side closer to the edge of the recessed part 20 with respect to the groove 24, and a protruding line 242 is also formed on the side farther from the edge of the recessed part 20 with respect to the groove 24, i.e. This is an example in which double protrusions 241 and 242 are formed.

The example in FIG. 9 is an example in which a protrusion 242 is formed on the side of the groove 24 that is far from the edge of the recess 20, and no protrusion is formed on the side that is closer to the edge of the recess 20 with respect to the groove 24. .

The side on which the protrusions 241 and 242 are formed with respect to the groove 24 can be adjusted by, for example, the angle at which the tool is applied. The height of the protrusions 241 and 242 is approximately the same as the depth of the groove 24, and is, for example, approximately 0.05 mm or more and 0.2 mm or less.

Note that, similarly to the groove 24 formed around the recess 20 of the block 2, the groove 34 formed around the recess 30 of the block 3 also has protrusions 341, 342 (second ridges) are formed.

10 to 13 are diagrams showing examples of joining the blocks 2, 3 and the partition plate 4. These figures are partially enlarged views of the grooves 24, 34 formed around the recesses 20, 30 of the blocks 2, 3 and the vicinity thereof.

The hardness of the partition plate 4 (cover) is the same as that of the blocks 2 and 3 or softer than the blocks 2 and 3. Therefore, the protrusions 241, 242 of the block 2 and the protrusions 341, 342 of the block 3 bite into the partition plate 4. This makes it possible to suppress minute gaps between the blocks 2, 3 and the partition plate 4, and effectively suppress radio wave leakage.

The example in FIG. 10 shows a protrusion 241 formed on the side closer to the edge of the recess 20 with respect to the groove 24 of the block 2, and a protrusion formed on the side closer to the edge of the recess 30 with respect to the groove 34 of the block 3. This is an example in which the strip 341 bites into the partition plate 4. In this way, the protrusions 241 and 341 mesh together in the stacking direction (Z direction) at positions closer to the recesses 20 and 30, forming a strong biting part, so that radio wave leakage can be effectively suppressed. can.

The example in FIG. 11 shows a protrusion 241 formed on the side closer to the edge of the recess 20 with respect to the groove 24 of the block 2, and a protrusion formed on the side farther from the edge of the recess 30 with respect to the groove 34 of the block 3. This is an example in which the strip 342 bites into the partition plate 4. On the contrary, the protrusions 242 and 341 may bite into the partition plate 4. By meshing the protrusions 241 and 341 alternately with the partition plate 4 in this way, double biting parts are formed while suppressing excessive deformation of the partition plate 4, so that radio wave leakage can be effectively suppressed. can.

The example in FIG. 12 shows a protrusion 242 formed on the side far from the edge of the recess 20 with respect to the groove 24 of the block 2, and a protrusion formed on the side far from the edge of the recess 30 with respect to the groove 34 of the block 3. This is an example in which the strip 342 bites into the partition plate 4. This configuration also makes it possible to suppress radio wave leakage.

In the example of FIG. 13, a protrusion 241 formed on the side closer to the edge of the recess 20 with respect to the groove 24 of the block 2, a protrusion 242 formed on the side farther from the edge of the recess 20, and a groove of the block 3. This is an example in which a protrusion 341 formed on the side closer to the edge of the recess 30 and a protrusion 342 formed on the side farther from the edge of the recess 30 bite into the partition plate 4. In this way, the protrusions 241, 242, 341, 342 mesh with the partition plate 4 on both sides of the grooves 24, 34, forming double strong biting parts, thereby effectively suppressing radio wave leakage. Can be done.

FIG. 14 is a diagram showing an example of a procedure for manufacturing the waveguide filter 1. As shown in FIG. The manufacturing method is an example of a method for manufacturing a waveguide according to the embodiment.

First, recesses 20 and 30 are formed in opposing surfaces 29 and 39 of blocks 2 and 3 by machining (S1).

Next, protrusions 241-342 are formed on the opposing surfaces 29, 39 of the blocks 2, 3 along the edges of the recesses 20, 30, protruding from the opposing surfaces 29, 39 (S2). Specifically, when forming the grooves 24, 34 by machining along the edges of the recesses 20, 30 on the opposing surfaces 29, 39 of the blocks 2, 3, a convex portion is formed on one or both edges of the grooves 24, 34. Strips 241-342 are formed (see Figures 7-9).

Next, the blocks 2 and 3 sandwich the partition plate 4, and the opposing surfaces 29 and 39 of the blocks 2 and 3 are brought into contact with the partition plate 4 (S3). Specifically, by bringing the partition plate 4, which has the same hardness as the blocks 2, 3 or softer than the blocks 2, 3, into contact with the opposing surfaces 29, 39 of the blocks 2, 3, the convex strips 241 of the blocks 2, 3 are removed. -342 into the partition plate 4 (see Figures 10 to 13).

Next, the blocks 2 and 3 and the partition plate 4 are fastened together using fastening members such as screws (S4). Thereby, a waveguide filter 1 is obtained.

In addition, after fastening, it is preferable to pressurize the blocks 2 and 3 with a press machine to retighten the screws. This makes it possible to make the whole of the protrusions 241-342 bite into the partition plate 4. When the protrusions 241-342 dig into the partition plate 4 due to the pressure applied by the press machine, the dimension in the thickness direction decreases by the biting amount, so the screws are tightened more.

Although the embodiments of the present invention have been described above, the present invention is not limited to the embodiments described above, and it goes without saying that various modifications can be made by those skilled in the art.

In the above embodiment, when forming the grooves 24, 34 by machining, an example has been described in which the protrusions 241-342 are formed together with the grooves 24, 34, but the present invention is not limited to this. The protrusions 241-342 may be formed by applying a metal material.

Further, in the above embodiment, the characteristics of the waveguide filter 1 as an example of a waveguide have been described, but the characteristics are similar to that of a waveguide filter 1 having a waveguide structure in which a recess formed in a block is covered with a cover, for example, a normal waveguide filter 1. It may also be applied to other types of waveguides such as waveguides and circulators.

Hereinafter, typical embodiments of the present invention will be listed.

(1)
A metal block with a recess formed on one side for radio wave propagation,
a metal cover that contacts the one surface of the block and covers the recess;
Equipped with
A protruding strip is formed on the one surface of the block, protruding from the one surface along the edge of the recess,
The hardness of the cover is the same as or softer than the block, and the protrusions of the block bite into the cover.
waveguide.

(2)
A groove is formed on the one surface of the block along the edge of the recess,
The protruding strip is formed on one or both edges of the groove,
The waveguide according to (1).

(3)
The protruding strip is formed in an endless shape surrounding the concave portion,
The waveguide according to (1) or (2).

(4)
a first metal block having a first recess for radio wave propagation formed on a first surface;
a second metal block having a second recess formed on the second surface for radio wave propagation;
sandwiched between the first block and the second block, in contact with the first surface of the first block, in contact with the second surface of the second block, and between the first recess and the second recess. a metal cover interposed in the
Equipped with
A first protrusion is formed on the first surface of the first block, protruding from the first surface along an edge of the first recess,
A second protruding line is formed on the second surface of the second block, protruding from the second surface along an edge of the second recess,
The hardness of the cover is the same as that of the first and second blocks or softer than the first and second blocks, and the cover has the first protrusion of the first block and the first protrusion of the second block. 2 protrusions dig into the
waveguide.

(5)
A first groove is formed on the first surface of the first block along an edge of the first recess, and the first protrusion is formed on one or both edges of the first groove,
A second groove is formed on the second surface of the second block along the edge of the second recess, and the second protrusion is formed on one or both edges of the second groove,
the first groove and the second groove face each other with the cover in between;
The waveguide according to (4).

(6)
The first protrusion is formed on a side closer to the edge of the first recess with respect to the first groove,
The second protrusion is also formed on a side closer to the edge of the second recess with respect to the second groove,
The waveguide according to (5).

(7)
The first protrusion is formed on a side closer to the edge of the first recess with respect to the first groove,
The second protrusion is formed on a side farther from the edge of the second recess with respect to the second groove,
The waveguide according to (5).

(8)
The first protrusion is formed on both sides of the first groove,
The second protrusion is also formed on both sides of the second groove,
The waveguide according to (5).

(9)
A transmitter comprising the waveguide according to any one of (1) to (8).

(10)
Forming a convex line raised from the first surface along the edge of the recess on the first surface of a metal block having a recess for radio wave propagation formed on one surface,
A metal cover having the same hardness as the block or softer than the block is brought into contact with the one surface of the block, and the protruding stripes of the block bite into the cover.
Method of manufacturing waveguides.

(11)
The protruding stripes are formed on one or both edges of the groove when forming the groove along the edge of the recess on the one surface of the block by machining.
The method for manufacturing a waveguide according to (10).

1 Waveguide filter, 2 Block, 20 Recess, 21, 22 Resonance region, 221, 222 Additional region, 23 Coupling window, 24 Groove, 241, 242 Convex strip, 25 Coupling window, 29 Opposing surface, 3 Block, 30 Recess , 31, 32 resonance region, 311, 312 additional region, 33 coupling window, 34 groove, 341, 342 ridge, 35 coupling window, 39 opposing surface, 4 partition plate, 41-45 coupling window, 82, 83 waveguide type line, 91 magnetron, 92 pulse drive circuit, 93 circulator, 94 terminator, 95 circulator, 96 rotary joint, 97 antenna, 98 limiter circuit, 99 receiving circuit, 100 radar

Claims (11)

A metal block with a recess formed on one side for radio wave propagation,
a metal cover that contacts the one surface of the block and covers the recess;
Equipped with
A protruding strip is formed on the one surface of the block, protruding from the one surface along the edge of the recess,
The hardness of the cover is the same as or softer than the block, and the protrusions of the block bite into the cover.
waveguide. A groove is formed on the one surface of the block along the edge of the recess,
The protruding strip is formed on one or both edges of the groove,
The waveguide according to claim 1. The protruding strip is formed in an endless shape surrounding the concave portion,
The waveguide according to claim 1. a first metal block having a first recess for radio wave propagation formed on a first surface;
a second metal block having a second recess formed on the second surface for radio wave propagation;
sandwiched between the first block and the second block, in contact with the first surface of the first block, in contact with the second surface of the second block, and between the first recess and the second recess. a metal cover interposed in the
Equipped with
A first protrusion is formed on the first surface of the first block, protruding from the first surface along an edge of the first recess,
A second protrusion is formed on the second surface of the second block, protruding from the second surface along an edge of the second recess,
The hardness of the cover is the same as that of the first and second blocks or softer than the first and second blocks, and the cover has the first protrusion of the first block and the first protrusion of the second block. 2 protrusions dig into the
waveguide. A first groove is formed on the first surface of the first block along an edge of the first recess, and the first protrusion is formed on one or both edges of the first groove,
A second groove is formed on the second surface of the second block along the edge of the second recess, and the second protrusion is formed on one or both edges of the second groove,
the first groove and the second groove face each other with the cover in between;
The waveguide according to claim 4. The first protrusion is formed on a side closer to the edge of the first recess with respect to the first groove,
The second protrusion is also formed on a side closer to the edge of the second recess with respect to the second groove,
The waveguide according to claim 5. The first protrusion is formed on a side closer to the edge of the first recess with respect to the first groove,
The second protrusion is formed on a side farther from the edge of the second recess with respect to the second groove,
The waveguide according to claim 5. The first protrusion is formed on both sides of the first groove,
The second protrusion is also formed on both sides of the second groove,
The waveguide according to claim 5. A transmitter comprising the waveguide according to claim 1. Forming a convex line raised from the first surface along the edge of the recess on the first surface of a metal block having a recess for radio wave propagation formed on one surface,
A metal cover having the same hardness as the block or softer than the block is brought into contact with the one surface of the block, and the protruding stripes of the block bite into the cover.
Method of manufacturing waveguides. The protruding stripes are formed on one or both edges of the groove when forming the groove along the edge of the recess on the one surface of the block by machining.
The method for manufacturing a waveguide according to claim 10.

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