Waveguide, transmitter, and method for manufacturing a waveguide
The waveguide design with recesses and protrusions on metal blocks and a softer cover addresses radio wave leakage issues, enhancing contact and reducing leakage in waveguides.
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Patents
- Current Assignee / Owner
- FURUNO ELECTRIC CO LTD
- Filing Date
- 2022-08-29
- Publication Date
- 2026-06-29
AI Technical Summary
Existing waveguides face issues with radio wave leakage due to gaps between metal blocks, which are not effectively addressed by existing techniques like silver plating on raised strips, leading to surface flatness problems and incomplete gap elimination.
A waveguide design featuring recesses on metal blocks with protrusions on their surfaces that bite into a softer metal cover, forming grooves and ridges to minimize gaps and suppress radio wave leakage.
The design effectively suppresses radio wave leakage by ensuring strong contact between metal blocks and a softer cover, reducing performance inconsistencies and leakage through minute gaps.
Smart Images
Figure 0007881416000001 
Figure 0007881416000002 
Figure 0007881416000003
Abstract
Description
Technical Field
[0001] The present invention relates to a waveguide, a transmitter, and a method for manufacturing a waveguide.
Background Art
[0002] A technique for constructing a waveguide by joining metal blocks divided in a longitudinal section is known. While this type of waveguide is advantageous in terms of manufacturing, measures against radio wave leakage (electrical loss) from the gaps between the opposing surfaces of the assembled metal blocks are required.
[0003] Patent Document 1 discloses a technique in which a raised strip is formed on the opposing surface of one metal block near a groove by applying silver plating or using a metal block or other members to eliminate the gap between the opposing surfaces of both blocks.
Prior Art Documents
Patent Documents
[0004]
Patent Document 1
Summary of the Invention
Problems to be Solved by the Invention
[0005] However, in the technique disclosed in Patent Document 1, the flatness of the surface of the formed raised strip becomes a new problem, and there is a limit to completely eliminating the gap.
[0006] The present invention has been made in view of the above problems, and its main object is to provide a waveguide, a transmitter, and a method for manufacturing a waveguide capable of effectively suppressing radio wave leakage.
Means for Solving the Problems
[0007] To solve the above problems, a waveguide according to one aspect of the present invention comprises a metal block with a recess for radio wave propagation formed on one surface, and a metal cover that contacts the one surface of the block and covers the recess, wherein a protrusion is formed on the one surface of the block, rising from the one surface along the edge of the recess, and the hardness of the cover is the same as or softer than the block, so that the protrusion of the block bites into the cover. This makes it possible to effectively suppress radio wave leakage.
[0008] In the above embodiment, a groove is formed on one surface of the block along the edge of the recess, and the protrusions may be formed on one or both edges of the groove. This makes it possible to form the protrusions together with the groove.
[0009] In the above embodiment, the protrusions may be formed in an endless manner surrounding the recesses. This makes it possible to more effectively suppress radio wave leakage.
[0010] Furthermore, a waveguide according to another aspect of the present invention comprises a first metal block having a first recess for radio wave propagation formed on its first surface, a second metal block having a second recess for radio wave propagation formed on its second surface, and a metal cover sandwiched between the first and second blocks, in contact with the first surface of the first block, in contact with the second surface of the second block, and interposed between the first and second recesses, wherein a first protrusion is formed on the first surface of the first block, rising from the first surface along the edge of the first recess, and a second protrusion is formed on the second surface of the second block, rising from the second surface along the edge of the second recess, and the hardness of the cover is the same as or softer than the first and second blocks, and the first protrusion of the first block and the second protrusion of the second block bite into the cover. This makes it possible to effectively suppress radio wave leakage.
[0011] In the above embodiment, a first groove is formed on the first surface of the first block along the edge of the first recess, and the first ridge 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 ridge is formed on one or both edges of the second groove; and the first groove and the second groove may face each other with the cover in between. This makes it possible to form ridges together with the grooves.
[0012] In the above embodiment, the first protrusion may be formed on the side of the first groove closer to the edge of the first recess, and the second protrusion may also be formed on the side of the second groove closer to the edge of the second recess. This allows the first and second protrusions to interlock on the sides closer to the first and second recesses, forming a strong contact area and making it possible to more effectively suppress radio wave leakage.
[0013] In the above embodiment, the first protrusion may be formed on the side of the first groove closer to the edge of the first recess, and the second protrusion may be formed on the side of the second groove further from the edge of the second recess. This allows for the formation of double contact areas by the first or second protrusion on the side closer to and further from the first and second recesses, thereby more effectively suppressing radio wave leakage.
[0014] In the above embodiment, 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. This allows the first and second protrusions to interlock on both the side closer to and the side further away from the first and second recesses, thereby forming a double layer of strong contact and more effectively suppressing radio wave leakage.
[0015] Furthermore, another embodiment of the present invention provides a waveguide. This makes it possible to provide a waveguide that effectively suppresses radio wave leakage.
[0016] In addition, a method for manufacturing a waveguide according to another aspect of the present invention includes forming a ridge on one surface of a metal block having a recess for radio wave propagation formed on one surface, the ridge rising from the one surface along the edge of the recess, and bringing a metal cover having the same hardness as or softer than the block into contact with the one surface of the block so that the ridge of the block bites into the cover. According to this, it becomes possible to effectively suppress radio wave leakage.
[0017] In the above aspect, the ridge may be formed on one or both edges of the groove when forming a 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 ridge together with the groove.
Brief Description of the Drawings
[0018] [Figure 1] It is a diagram showing a configuration example of a radar. [Figure 2] It is a diagram showing a configuration example of a waveguide filter. [Figure 3] It is a diagram showing a configuration example of a waveguide filter. [Figure 4] It is a diagram showing a configuration example of a waveguide filter. [Figure 5] It is a diagram showing a configuration example of a waveguide filter. [Figure 6] It is a diagram showing a configuration example of a waveguide filter. [Figure 7] It is a diagram showing a configuration example of a groove and a ridge. [Figure 8] It is a diagram showing a configuration example of a groove and a ridge. [Figure 9] It is a diagram showing a configuration example of a groove and a ridge. [Figure 10] It is a diagram showing an example of joining a block and a partition plate. [Figure 11] It is a diagram showing an example of joining a block and a partition plate. [Figure 12] It is a diagram showing an example of joining a block and a partition plate. [Figure 13] It is a diagram showing an example of joining a block and a partition plate. [Figure 14] This figure shows an example of the procedure for manufacturing a waveguide filter. [Modes for carrying out the invention]
[0019] Embodiments of the present invention will be described below with reference to the drawings.
[0020] Figure 1 is a block diagram showing an example configuration of radar 100. Radar 100 is a microwave transceiver that transmits and receives microwaves. Radar 100 is equipped with a waveguide filter 1. Radar 100 is an example of a transmitter according to the embodiment, and waveguide filter 1 is an example of a waveguide according to the embodiment.
[0021] 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.
[0022] The magnetron 91 is a microwave generator that oscillates, for example, a 9.4 GHz microwave as its fundamental frequency. The pulse drive circuit 92 intermittently drives the magnetron 91 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.
[0023] The waveguide filter 1 is interposed between the magnetron 91 and the antenna 97. In this embodiment, the waveguide filter 1 is configured as a bandpass filter, allowing the fundamental wave to pass through while suppressing the passage of harmonics relative to the fundamental wave. The suppressed harmonics are consumed by the terminator 94 connected to the circulator 93.
[0024] The circulator 95 outputs the transmission signal from the waveguide filter 1 to the antenna 97 and the reception signal from the antenna 97 to the receiving circuit 99. The rotary joint 96 is interposed between the antenna 97 and the circulator 95, electrically connecting the rotating system and the stationary system.
[0025] Antenna 97 rotates using a motor (not shown) and transmits the transmission signal as a radio wave pulse, while also converting the received reflected wave into a received signal. Limiter circuit 98 suppresses the high level of the received signal immediately after reception begins. Receiving circuit 99 acquires the received signal from antenna 97.
[0026] The path from the magnetron 91 to the antenna 97 is made up of waveguides. Furthermore, the path from the antenna 97 to the limiter circuit 98 is also made up of waveguides.
[0027] In this embodiment, the radar 100 to which the waveguide filter 1 is applied is a marine radar that transmits and receives microwaves, but it is not limited to this, and may be, for example, an in-vehicle radar for obstacle detection or collision avoidance that transmits and receives millimeter waves.
[0028] Figure 2 is an exploded perspective view showing an example configuration of waveguide filter 1. Waveguide filter 1 comprises two blocks 2 and 3 and a partition plate 4 sandwiched between them.
[0029] Figure 3 shows an example configuration of block 2, and is a view of block 2 from the partition plate 4 side. Figure 4 shows an example configuration of block 3, and is a view of block 3 from the partition plate 4 side.
[0030] Figure 5 shows an example of the configuration of the partition plate 4, and is a view of the partition plate 4 from the block 3 side. Figure 6 is a cross-section of block 2 when it is cut along the line VI-VI shown in Figure 3.
[0031] In the diagram, the Z direction represents the thickness direction or stacking direction of blocks 2, 3 and partition plate 4. The X and Y directions represent the short and long directions of blocks 2, 3 and partition plate 4 in a plane perpendicular to the Z direction, respectively.
[0032] Blocks 2 and 3 and partition plate 4 are made of metal. Specifically, blocks 2 and 3 are made of a conductive metal material such as aluminum. Partition plate 4 is also made of a conductive metal material such as an aluminum alloy.
[0033] Blocks 2 and 3 are separated by a partition plate 4, with the opposing surface 29 of block 2 in contact with one main surface of the partition plate 4, and the opposing surface 39 of block 3 in contact with the other main surface of the partition plate 4. Blocks 2 and 3 and the partition plate 4 are fastened together by fastening members such as screws (not shown).
[0034] As shown in Figure 3, a recess 20 for radio wave propagation is formed on the opposing surface 29 of block 2. The recess 20 includes two resonant regions 21 and 22 aligned in the Y direction, and a coupling window 23 interposed between them. The resonant region 22 has additional regions 221 and 222 for adjusting harmonics.
[0035] A coupling window 25 is formed at the bottom of the resonant region 21 of block 2, connecting the resonant region 21 to the outside. An input waveguide line 82 (see Figure 2) is connected to the coupling window 25, and radio waves are input from the waveguide line 82 to the resonant region 21 through the coupling window 25.
[0036] As shown in Figure 4, a recess 30 for radio wave propagation is formed on the opposing surface 39 of block 3. The recess 30 includes two resonant regions 31 and 32 aligned in the Y direction, and a coupling window 33 interposed between them. The resonant region 31 has additional regions 311 and 312 for adjusting harmonics.
[0037] A coupling window 35 is formed at the bottom of the resonant region 32 of block 3, connecting the resonant region 32 to the outside. An output waveguide line 83 (see Figure 2) is connected to the coupling window 35, and radio waves are output from the resonant region 32 through the coupling window 35 to the waveguide line 83.
[0038] As shown in Figure 5, the partition plate 4 has multiple connecting windows 41-45 formed therein. The partition plate 4 is sandwiched between blocks 2 and 3 and interposed between recesses 20 and 30. That is, the partition plate 4 covers both recesses 20 and 30. In this embodiment, recesses 20 and 30 are mirror-symmetrical.
[0039] The coupling windows 41-44 connect the resonant region 22 of block 2 with the resonant region 31 of block 3. The coupling window 45 connects the resonant region 21 of block 2 with the resonant region 32 of block 3.
[0040] When blocks 2, 3 and partition plate 4 are assembled and fastened, each resonant region 21, 22, 31, and 32 functions as a waveguide resonator. In this embodiment, the waveguide filter 1 includes a total of four waveguide resonators. Each resonant region 21, 22, 31, and 32 has predetermined dimensions determined based on the frequency of the radio waves (electromagnetic waves) used.
[0041] Radio waves from the input waveguide line 82 propagate through the coupling window 25 to the resonant region 21, from the resonant region 21 to the resonant region 22 through the coupling window 23, from the resonant region 22 to the resonant region 31 through the coupling windows 41-44, from the resonant region 31 to the resonant region 32 through the coupling window 33, and finally output to the output waveguide line 83 through the coupling window 35. In addition, some radio waves propagate from the resonant region 21 to the resonant region 32 through the coupling window 45.
[0042] Each of the resonant regions 21, 22, 31, and 32 has a flattened shape in which the dimension in the Z direction is shorter than the dimensions in the X and Y directions, causing the received radio waves to resonate in TE mode. The electric field vector of the resonant radio waves points in the Z direction. Each of the resonant regions 21, 22, 31, and 32 propagates single-mode radio waves.
[0043] Incidentally, in general, waveguide structures, where multiple components are combined to form a cavity for radio wave propagation, have the problem that tiny gaps can form at the points where the components are joined, causing radio waves to leak out through these gaps, leading to performance degradation and inconsistencies.
[0044] Therefore, in this embodiment, by making the opposing surfaces 29 and 39 of blocks 2 and 3 the shape described below, minute gaps are suppressed, making it possible to effectively suppress radio wave leakage.
[0045] As shown in Figure 3, on the opposing surface 29 (first surface) of block 2 (first block) where the recess 20 (first recess) is formed, a groove 24 (first groove) is formed along the edge of the recess 20. The groove 24 is formed in an endless manner surrounding the recess 20. Specifically, the groove 24 is formed parallel to the edge of the recess 20 and at a certain distance 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 to 1 mm.
[0046] Similarly, as shown in Figure 4, on the opposing surface 39 (second surface) of block 3 (second block) where the recess 30 (second recess) is formed, a groove 34 (second groove) is formed along the edge of the recess 30. The groove 34 is formed in an endless manner surrounding the recess 30. Specifically, the groove 34 is formed parallel to the edge of the recess 30, at a certain distance 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 to 1 mm.
[0047] In this embodiment, the grooves 24 and 34 formed around the recesses 20 and 30 are mirror-symmetric to 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 across the partition plate 4, i.e., they are aligned in the Z direction.
[0048] Figures 7 to 9 are partially enlarged views of the groove 24 formed around the recess 20 of block 2 and its vicinity.
[0049] The groove 24 is formed by machining. That is, the groove 24 is formed by grooving using a tool. When the groove 24 is formed by machining, along with the groove 24 which is recessed from the opposing surface 29, protrusions 241, 242 (first protrusions) are formed on one or both edges of the groove 24 which are raised from the opposing surface 29.
[0050] The ridges 241 and 242 are continuous raised portions, elongated and protruding relative to the opposing surface 29. Like the groove 24, the ridges 241 and 242 are formed along the edge of the recess 20. In other words, the ridges 241 and 242 are formed in an endless manner surrounding the recess 20.
[0051] The example in Figure 7 shows a case where 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 further from the edge of the recess 20.
[0052] The example in Figure 8 shows a case where a protrusion 241 is formed on the side of the groove 24 that is closer to the edge of the recess 20, and a protrusion 242 is also formed on the side of the groove 24 that is further from the edge of the recess 20, i.e., a case in which double protrusions 241 and 242 are formed.
[0053] The example in Figure 9 shows a case where a ridge 242 is formed on the side of the groove 24 that is far from the edge of the recess 20, and no ridge is formed on the side of the groove 24 that is close to the edge of the recess 20.
[0054] The side on which the protrusions 241 and 242 are formed relative to the groove 24 can be adjusted, for example, by 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, for example, between 0.05 mm and 0.2 mm.
[0055] In addition, similar to the groove 24 formed around the recess 20 of block 2, the groove 34 formed around the recess 30 of block 3 also has protrusions 341, 342 (second protrusions) formed on one or both sides of the groove 34.
[0056] Figures 10 to 13 show examples of how blocks 2, 3 and partition plate 4 are joined together. These figures are partially enlarged views of the grooves 24, 34 formed around the recesses 20, 30 of blocks 2, 3 and their vicinity.
[0057] The hardness of partition plate 4 (cover) is the same as or softer than that of blocks 2 and 3. As a result, the protrusions 241 and 242 of block 2 and the protrusions 341 and 342 of block 3 bite into partition plate 4. This suppresses minute gaps between blocks 2 and 3 and partition plate 4, making it possible to effectively suppress radio wave leakage.
[0058] The example in Figure 10 shows a case where a protrusion 241 formed on the side closer to the edge of the recess 20 relative to the groove 24 of block 2, and a protrusion 341 formed on the side closer to the edge of the recess 30 relative to the groove 34 of block 3, are interlocked with the partition plate 4. In this way, the protrusions 241 and 341 interlock in the stacking direction (Z direction) at a position closer to the recesses 20 and 30, forming a strong interlocking section, which effectively suppresses radio wave leakage.
[0059] The example in Figure 11 shows a case where a protrusion 241 formed on the side of the groove 24 of block 2 that is closer to the edge of the recess 20, and a protrusion 342 formed on the side of the groove 34 of block 3 that is further from the edge of the recess 30, are embedded in the partition plate 4. Conversely, the protrusions 242 and 341 may also be embedded in the partition plate 4. By interlocking the protrusions 241 and 341 with the partition plate 4 in this way, a double embedding section is formed while suppressing excessive deformation of the partition plate 4, thereby effectively suppressing radio wave leakage.
[0060] The example in Figure 12 shows a case where a protrusion 242 formed on the side of the recess 20 furthest from the edge of the groove 24 of block 2, and a protrusion 342 formed on the side of the recess 30 furthest from the edge of the groove 34 of block 3, are embedded in the partition plate 4. This configuration can also suppress radio wave leakage.
[0061] The example in Figure 13 shows an example where a protrusion 241 formed on the side of the recess 20 closer to the edge of the groove 24 of block 2, and a protrusion 242 formed on the side of the recess 20 further from the edge of the groove 20, and a protrusion 341 formed on the side of the recess 30 closer to the edge of the groove 34 of block 3, and a protrusion 342 formed on the side of the recess 30 further from the edge of the groove 30, are interlocked with the partition plate 4. In this way, the protrusions 241, 242, 341, and 342 interlock with the partition plate 4 on both sides of the grooves 24 and 34, forming a double layer of strong interlocking parts, which effectively suppresses radio wave leakage.
[0062] Figure 14 shows an example of the procedure for manufacturing the waveguide filter 1. This manufacturing method is an example of a method for manufacturing a waveguide according to the embodiment.
[0063] First, recesses 20 and 30 are formed on the opposing surfaces 29 and 39 of blocks 2 and 3 by machining (S1).
[0064] Next, protrusions 241-342 are formed on the opposing surfaces 29 and 39 of blocks 2 and 3, along the edges of the recesses 20 and 30, extending from the opposing surfaces 29 and 39 (S2). Specifically, when grooves 24 and 34 are formed on the opposing surfaces 29 and 39 of blocks 2 and 3 along the edges of the recesses 20 and 30 by machining, protrusions 241-342 are formed on one or both edges of the grooves 24 and 34 (see Figures 7-9).
[0065] Next, the partition plate 4 is sandwiched between blocks 2 and 3, and the opposing surfaces 29 and 39 of 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 or is softer than blocks 2 and 3, into contact with the opposing surfaces 29 and 39 of blocks 2 and 3, the protrusions 241-342 of blocks 2 and 3 are made to bite into the partition plate 4 (see Figures 10-13).
[0066] Next, blocks 2 and 3 and partition plate 4 are fastened together with fasteners such as screws (S4). This completes the waveguide filter 1.
[0067] Furthermore, after fastening, it is preferable to pressurize blocks 2 and 3 with a press machine and tighten the screws. This makes it possible to embed the entire protrusions 241-342 into the partition plate 4. When the protrusions 241-342 are embedded into the partition plate 4 by the press machine, the thickness dimension decreases by the amount they are embedded, so the screws are tightened further.
[0068] Although embodiments of the present invention have been described above, the present invention is not limited to the embodiments described above, and various modifications are of course possible for those skilled in the art.
[0069] In the above embodiment, an example was described in which the ridges 241-342 are formed together with the grooves 24 and 34 when the grooves 24 and 34 are formed by machining. However, the invention is not limited to this, and for example, the ridges 241-342 may be formed by adding metal material to the opposing surfaces 29 and 39.
[0070] Furthermore, although the above embodiment described the features of the waveguide filter 1 as an example of a waveguide, these features may also be applied to other types of waveguides, such as ordinary waveguides and circulators, which have a waveguide structure in which a recess formed in a block is covered with a cover.
[0071] The following lists representative embodiments of the present invention.
[0072] (1) A metal block with a recess for radio wave propagation formed on one surface, A metal cover that contacts one surface of the block and covers the recess, Equipped with, On the first surface of the block, a protruding ridge is formed that rises from the first 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.
[0073] (2) A groove is formed on one surface of the block along the edge of the recess. The aforementioned protrusions are formed on one or both edges of the groove. Waveguide as described in (1).
[0074] (3) The aforementioned protrusions are formed in an endless manner surrounding the aforementioned recesses. Waveguide as described in (1) or (2).
[0075] (4) A first metal block having a first recess for radio wave propagation formed on its first surface, A second metal block having a second recess for radio wave propagation formed on its second surface, A metal cover is 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 interposed between the first recess and the second recess. Equipped with, A first protrusion is formed on the first surface of the first block, rising from the first surface along the edge of the first recess. A second protrusion is formed on the second surface of the second block, rising from the second surface along the edge of the second recess. The hardness of the cover is the same as or softer than that of the first and second blocks, and the first protrusion of the first block and the second protrusion of the second block bite into the cover. waveguide.
[0076] (5) A first groove is formed on the first surface of the first block along the 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. Waveguide as described in (4).
[0077] (6) The first protrusion is formed on the side of the first recess that is closer to the edge of the first groove, The second protrusion is also formed on the side of the second groove that is closer to the edge of the second recess. Waveguide as described in (5).
[0078] (7) The first protrusion is formed on the side of the first recess that is closer to the edge of the first groove, The second protrusion is formed on the side of the second groove that is further away from the edge of the second recess. Waveguide as described in (5).
[0079] (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. Waveguide as described in (5).
[0080] (9) A transmitter equipped with a waveguide as described in any of (1) through (8).
[0081] (10) A metal block having a recess for radio wave propagation formed on one surface, wherein a raised ridge is formed on the one surface along the edge of the recess, A metal cover having the same hardness as or softer than the block is brought into contact with one surface of the block, causing the protrusions of the block to bite into the cover. A method for manufacturing waveguides.
[0082] (11) The aforementioned protrusions are formed on one or both edges of the groove when a groove is formed along the edge of the recess on one surface of the block by machining. (10) A method for manufacturing a waveguide as described above. [Explanation of symbols]
[0083] 1 Waveguide filter, 2 Block, 20 Recess, 21,22 Resonant region, 221,222 Additional region, 23 Coupling window, 24 Groove, 241,242 Protrusion, 25 Coupling window, 29 Opposing surface, 3 Block, 30 Recess, 31,32 Resonant region, 311,312 Additional region, 33 Coupling window, 34 Groove, 341,342 Protrusion, 35 Coupling window, 39 Opposing surface, 4 Partition plate, 41-45 Coupling windows, 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
1. A first metal block having a first recess for radio wave propagation formed on its first surface, A second metal block having a second recess for radio wave propagation formed on its second surface, A metal cover is 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 interposed between the first recess and the second recess. Equipped with, A first protrusion is formed on the first surface of the first block, rising from the first surface along the edge of the first recess. A second protrusion is formed on the second surface of the second block, rising from the second surface along the edge of the second recess. The hardness of the cover is the same as or softer than that of the first and second blocks, and the first protrusion of the first block and the second protrusion of the second block bite into the cover. A first groove is formed on the first surface of the first block along the 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. waveguide.
2. The first protrusion is formed on the side of the first recess that is closer to the edge of the first groove, The second protrusion is also formed on the side of the second recess that is closer to the edge of the second groove. Waveguide according to claim 1.
3. The first protrusion is formed on the side of the first recess that is closer to the edge of the first groove, The second protrusion is formed on the side of the second groove that is further away from the edge of the second recess. Waveguide according to claim 1.
4. 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. Waveguide according to claim 1.
5. A transmitter comprising the waveguide described in claim 1.
6. A metal block having a recess for radio wave propagation formed on one surface, wherein a raised ridge is formed on the one surface along the edge of the recess, A metal cover having the same hardness as or softer than the block is brought into contact with one surface of the block, causing the protrusions of the block to bite into the cover. A method for manufacturing a waveguide, The aforementioned protrusions are formed on one or both edges of the groove when a groove is formed along the edge of the recess on one surface of the block by machining. A method for manufacturing waveguides.