JP2011211357A - Waveguide connection fitting - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a waveguide connection fitting capable of mutually connecting both waveguides, without having to provide a flange for connection on the tip of each waveguide.SOLUTION: A waveguide space 12, in which a pair of opening ends 11 are formed in the same shape as a waveguide 4 of a waveguide 2, is provided on a center portion of a connection fitting body 10, and an engagement space 14, into which the waveguide 2 can be engaged and a guide space 16 formed so as to be expanded to an outer wall of the connection fitting body 10, are successively formed on each opening end 11 side. A window section 18 for checking an insertion state of the waveguide 2 is formed on a sidewall of each engagement space 14; fixing projections 32 to be inserted between the inner wall of the engagement space 14 and the outer wall of the waveguide 2 to fix the waveguide 2 are formed on a cover body 30 for closing the window part 18; and further, slots 20, 22 for emitting a part of a radio wave passing the waveguide space 12 to the periphery of the waveguide space 12 are formed on the side wall of the waveguide space and the cover body 30.

Description

  The present invention relates to a waveguide connection fitting for connecting a plurality of waveguides.

  Conventionally, when two waveguides are connected to each other, flanges are provided at the ends of the respective waveguides, and the flanges are connected to each other via a predetermined connector (for example, a bolt and a nut, a metal cover, etc.). It was made to connect (for example, refer patent document 1, 2 grade | etc.,).

  Further, the waveguide may be used as a so-called slot antenna that radiates a part of the radio wave passing through the waveguide by forming a slot on the side wall (see, for example, Patent Documents 3 and 4). .

JP 2001-320201 A JP 2004-253982 A JP 2007-53514 A JP 2007-274146 A

  The reason why the waveguides are connected to each other through the flange as described above is to bring the open ends of the waveguides into close contact with each other to continuously couple the waveguides of the waveguides. Forming a flange at the end of the waveguide is costly, and when a flange is formed at the end of the waveguide, only the flange portion protrudes outside. There was a problem that the handling of was troublesome.

  Conventionally, when a waveguide is used as a slot antenna, it is necessary to form a slot in the waveguide itself, which also causes a problem of increasing the cost of the waveguide.

  The present invention has been made in view of such a problem, and it is possible to connect waveguides without providing a flange for connection at the tip of the waveguide, and a waveguide connection fitting that can be used as a slot antenna. The purpose is to provide.

The invention according to claim 1, which has been made to achieve such an object, is a waveguide fitting for connecting a plurality of waveguides,
A plurality of open ends having the same shape as the waveguides of the respective waveguides, and a waveguide space for coupling the waveguides of the respective waveguides;
Each of the waveguides is formed so as to be able to be inserted into each opening end side of the waveguide space, and an insertion space for continuously coupling the waveguide of the inserted waveguide and the waveguide space;
A guide space that is formed so as to expand from the insertion space toward the outer wall of the waveguide connection fitting, and guides each waveguide from the outside of the waveguide connection fitting to the insertion space;
With
One or more slots for radiating a part of the radio wave passing through the waveguide space to the outside are formed on the side wall of the waveguide space.

  The invention according to claim 2 is the waveguide fitting according to claim 1, wherein the slots are respectively different in directions different by 90 ° around the central axis along the traveling direction of the radio wave in the waveguide space. It is formed.

  According to a third aspect of the present invention, in the waveguide connection fitting according to the first or second aspect, the shield is configured separately from the waveguide connection fitting main body and can shield the slot. It is characterized by having a body.

  Next, the invention according to claim 4 is the waveguide fitting according to any one of claims 1 to 3, wherein the waveguide space has two open ends, The center axis of the waveguide connecting the ends is formed to be a straight line.

  The invention according to claim 5 is the waveguide fitting according to any one of claims 1 to 3, wherein the waveguide space has two open ends, and each open end The center axis of the waveguide connecting the two is bent at a predetermined angle.

  The invention according to claim 6 is the waveguide fitting according to any one of claims 1 to 3, wherein the waveguide space has three open ends, and each open end The center axis of the waveguide connecting the two is formed to have a T shape or a Y shape.

Next, the invention according to claim 7 is the waveguide fitting according to any one of claims 1 to 6,
On the side wall of each insertion space formed on each opening end side of the waveguide space, the waveguide inserted into each insertion space from the opening surface side of the slot formed on the side wall of the waveguide space. A window for confirming the tip position is formed,
In order to simultaneously close the window portions, the waveguide connection fitting main body comprises a lid configured separately from the body,
A slot having the same shape as the slot formed on the side wall of the waveguide space is formed in the lid.

The invention according to claim 8 is the waveguide fitting according to claim 7,
When viewed from the window, the width of the insertion space is larger than the width of the waveguide,
When the window is closed, the lid is inserted between the waveguide inserted into the insertion space and the inner wall of the insertion space to fix the tip of the waveguide in the insertion space. A fixing protrusion is formed.

  In the waveguide fitting according to claim 1, the waveguide to be connected is inserted from each guide space into the insertion space, and the tip of the waveguide is connected to the waveguide space and the insertion space. If the step is formed in contact with the step portion, a continuous waveguide is formed from the waveguide of the waveguide to the waveguide space. Waveguides can be coupled continuously.

  In addition, since one or more slots for radiating a part of the radio wave passing through the waveguide space to the outside are formed on the side wall of the waveguide space, the waveguide connecting bracket of the present invention operates as a slot antenna. Can be made.

  Then, if each waveguide is inserted into the insertion space by inserting its tip from each guide space, the state is maintained by friction between the outer wall of the waveguide and the inner wall of the insertion space, and the waveguide connection It will not come out of the bracket.

  Therefore, if the waveguide fitting of the present invention is used, it becomes possible to connect the waveguides with extremely simple work, and it is not necessary to provide a flange at the tip of the waveguide. It is possible to reduce the cost of the waveguide and simplify the handling of the waveguide during transportation and piping. Further, since the slot antenna can be realized without forming a slot in the waveguide, the cost of the waveguide can also be reduced.

  Further, according to the waveguide fitting of the present invention, the antenna gain and directivity can be changed by changing the shape of the slot. For this reason, if a plurality of waveguide connection fittings having different slot shapes are prepared and the waveguide connection fitting to be used is appropriately selected when the waveguide is piped, the waveguide connection fitting is installed. The antenna gain and directivity characteristics at the position can be set to desired characteristics.

Next, in the waveguide fitting according to claim 2, the slots are formed in directions different by 90 ° around the central axis along the traveling direction of the radio wave in the waveguide space.
For this reason, according to the waveguide fitting according to claim 2, the directivity characteristic of the antenna can be set to either the E plane or the H plane.

According to a third aspect of the present invention, there is provided the waveguide connector according to the third aspect, wherein the waveguide connector is provided separately from the waveguide connector metal body and is capable of shielding the slot.
For this reason, according to the waveguide connector according to claim 3, radio waves are radiated from some or all of the slots formed in the waveguide connector by shielding the slot with the shield. Can be prevented.

In particular, when a plurality of slots are formed in the waveguide connection fitting, the directivity of the slot antenna can be adjusted by shielding some of the slots with a shield.
On the other hand, according to the waveguide fitting according to claim 4, the waveguide space has two open ends, and the central axis of the waveguide connecting the open ends forms a straight line. Therefore, the two waveguides can be connected straight.

  According to the waveguide connection fitting of claim 5, the waveguide space has two open ends, and the central axis of the waveguide connecting the open ends is bent at a predetermined angle. Therefore, the two waveguides can be connected at a predetermined angle.

  According to the waveguide connection fitting of claim 6, the waveguide space has three open ends, and the central axis of the waveguide connecting the open ends is T-shaped or Y-shaped. Since it is formed so as to present, three waveguides can be connected in a T-shape or Y-shape, and used as a distributor (or a mixer) that distributes (or mixes) a signal to be transmitted. be able to.

Accordingly, if the waveguide fittings according to claims 4 to 6 are used in appropriate combination, the waveguide can be piped along a desired path.
Further, in the waveguide fitting according to claim 7, the opening of the slot formed in the side wall of the waveguide space is provided on the side wall of each insertion space formed on each opening end side of the waveguide space. From the surface side, window portions for confirming the tip positions of the waveguides inserted into the respective insertion spaces are formed.

  Therefore, according to the waveguide connecting metal fitting according to claim 7, the tip end position of the waveguide inserted into each insertion space is connected to the waveguide through the window portion formed on the side wall of each insertion space. It can be confirmed from the outside of the bracket.

  For this reason, when the user inserts the waveguide into the insertion space, the user can confirm whether or not the insertion is sufficient by using the window portion. It is possible to prevent a high-frequency signal transmission characteristic from being deteriorated by forming a space having a large diameter between the two.

  In addition, the waveguide connection fitting according to claim 7 is provided with a lid formed separately from the waveguide connection fitting main body in order to simultaneously close the windows. The lid is formed with a slot having the same shape as the slot formed in the side wall of the waveguide space.

  Therefore, according to the waveguide connecting bracket of the seventh aspect, after the waveguide is connected, the end portion of the waveguide can be protected by closing the window portion using the lid. In addition, since the slot having the same shape as the slot formed on the side wall of the waveguide space is formed on the lid, the slot formed on the side wall of the waveguide space is closed by the lid, and the slot antenna is formed. As a result, it is possible to prevent the function of the device from being impaired.

  Next, in the waveguide fitting according to the eighth aspect, the width of the insertion space is larger than the width of the waveguide as viewed from the window. The lid that closes the window is formed with a fixing projection that is inserted between the waveguide inserted into the insertion space and the inner wall of the insertion space to fix the distal end of the waveguide in the insertion space. Has been.

  Therefore, according to the waveguide connection fitting of the eighth aspect, the waveguide inserted in each insertion space can be firmly fixed by the fixing protrusion provided on the lid, and each waveguide is fixed. It is possible to more reliably prevent the tube from coming off the waveguide connection fitting.

It is a perspective view showing the structure of the waveguide connection metal fitting of embodiment. It is explanatory drawing showing the internal space of the waveguide connection metal fitting of embodiment. It is sectional drawing showing the internal space of the waveguide connection metal fitting of embodiment. It is explanatory drawing explaining the connection procedure of the waveguide to the waveguide connection metal fitting of embodiment. FIG. 10 is a perspective view illustrating a configuration of a waveguide connection fitting according to Modification 1. It is a perspective view showing the structure of the waveguide connection metal fitting of 2nd Embodiment. It is sectional drawing showing the internal space of the waveguide connection metal fitting of 2nd Embodiment. It is explanatory drawing explaining the connection procedure of the waveguide to the waveguide connection metal fitting of 2nd Embodiment. It is a perspective view showing the structure of the waveguide connection metal fitting of 3rd Embodiment. It is sectional drawing showing the internal space of the waveguide connection metal fitting of 3rd Embodiment. It is explanatory drawing showing the connection state of the waveguide to the waveguide connection metal fitting of 3rd Embodiment. 10 is a perspective view illustrating a configuration of a waveguide connection fitting of Modification 2. FIG. FIG. 10 is a perspective view illustrating a configuration of a waveguide connection fitting according to Modification 3. FIG. 10 is a perspective view illustrating a configuration of a waveguide connection fitting according to Modification 4. It is explanatory drawing showing the experiment example which measured the passage loss of the waveguide connection metal fitting. It is explanatory drawing showing the experiment example which measured the directivity of the waveguide connection metal fitting.

Embodiments of the present invention will be described below with reference to the drawings.
1-3 is explanatory drawing showing the structure of the waveguide connection metal fitting of embodiment, FIG. 1 is a perspective view showing the external appearance of a waveguide connection metal fitting, FIG. 2 is a waveguide connection metal fitting. FIG. 3 is an explanatory view showing the internal space, and FIG. 3 is a cross-sectional view showing the internal space of the waveguide connection fitting. FIG. 4 is an explanatory diagram showing a procedure for connecting the waveguide to the waveguide fitting.

  The waveguide connection fitting 1 of the present embodiment is for connecting two waveguides 2 having a rectangular cross section so that the waveguide is straight. The connection fitting main body 10 and the connection fitting main body 10 And a lid body 30 fitted to the window portion 18 formed on the side wall.

  As apparent from FIGS. 2 and 3, the opening center 11 having the same shape as that of the waveguide 4 of the waveguide 2 is provided on both sides in the insertion direction of each waveguide 2 in the inner central portion of the connection fitting body 10. A waveguide space 12 is formed.

  Further, in the connection fitting main body 10, each waveguide 2 is formed to be fitted in each opening end 11 side of the waveguide space 12, and the waveguide 4 and the waveguide space 12 of the inserted waveguide 2. Is inserted into the insertion space 14, and on the opposite side of the insertion space 14 from the waveguide space 12 (that is, outside the connection fitting body 10), the insertion space 14 is directed toward the outer wall of the connection fitting body 10. A guide space 16 is formed so as to expand.

  That is, the connection fitting main body 10 has an elongated rectangular shape along the insertion direction of the waveguide 2, and a pair of inner walls formed in a tapered shape from both sides in the axial direction along the insertion direction of the waveguide 2. The guide space 16 and the fitting space 14 are formed, and the waveguide space 12 for continuously coupling the waveguides 4 of the two waveguides 2 is formed at the center thereof.

  Further, in the connection fitting main body 10, a window portion 18 for confirming the tip position of the waveguide 2 inserted into each insertion space 14 is formed on the side wall of each insertion space 14 from the outside of the connection fitting main body 10. Has been. The window portion 18 is formed as a window portion common to each insertion space 14 in a region reaching both ends of each insertion space 14 with the waveguide space 12 interposed therebetween.

  Then, the outer wall of the connection fitting main body 10 serving as the side wall of the waveguide space 12 is recessed inward by the thickness of the lid body 30 so that the window portion 18 can be closed by the lid body 30. A slot 20 for radiating a part of the high-frequency signal passing through the waveguide space 12 to the surroundings is formed.

As is clear from FIG. 4A, the width (height in the drawing) of each insertion space 14 is larger than the width (height in the drawing) of the waveguide 2 when viewed from the window 18.
Then, the lid 30 fitted into the window portion 18 includes the waveguide 2 fitted into the fitting space 14 and the inner wall of the fitting space 14 when the window portion 18 is closed by fitting into the window portion 18. A fixing protrusion 32 is formed which is inserted into the gap 13 (see FIG. 4 (b)) formed therebetween to fix the distal end of the waveguide 2 in the fitting space 14.

  The lid 30 is formed with a slot 22 having the same shape as the slot 20 at a position corresponding to the slot 20 formed on the side wall of the waveguide space 12. When closed, the slot 20 of the waveguide space 12 is not blocked.

  In the waveguide fitting 1 of the present embodiment configured as described above, two waveguides 2 to be connected are inserted from the guide spaces 16 into the fitting spaces 14, and the waveguide 2 Is brought into contact with a step formed between the waveguide space 12 and the insertion space 14 (that is, on each opening end 11 side of the waveguide space 12), from the waveguide 4 of the waveguide 2. A continuous waveguide is formed in the waveguide space 12, and the waveguides 4 of the waveguide 2 can be continuously coupled via the waveguide space 12.

  Therefore, if the waveguide fitting 1 of this embodiment is used, the waveguides 2 can be connected to each other by an extremely simple operation, and a flange is provided at the tip of the waveguide 2. Since it is not necessary, the cost of the waveguide 2 can be reduced. In addition, handling of the waveguide 2 during transportation or piping can be simplified.

  Further, since the connection fitting main body 10 of the present embodiment is provided with the window 18 on the side wall of the fitting space 14, the position of the distal end of the waveguide 2 fitted into the fitting space 14 is set outside the connection fitting main body 10. Can be confirmed. For this reason, when the user inserts the waveguide 2 into the insertion space 14, the user can confirm whether or not the insertion is sufficient by using the window portion 18, and the waveguide of the waveguide 2. A space having a large diameter is formed between the waveguide space 12 and the waveguide space 12, and it is possible to prevent the transmission characteristics of the high-frequency signal from deteriorating.

  In addition, the waveguide connection fitting 1 of the present embodiment is provided with a lid 30 that is configured separately from the connection fitting main body 10 in order to close the window 18 of the connection fitting main body 10. After the waveguide 2 is connected, as shown in FIG. 4C, the window portion 18 is closed using the lid body 30 to protect the distal end portion of the waveguide 2.

  In addition, when each waveguide 2 is inserted into the insertion space 14 by inserting its distal end from each guide space 16, the state is maintained by friction between the outer wall of the waveguide 2 and the inner wall of the insertion space 14. However, in the present embodiment, the width (height in the drawing) of each insertion space 14 is set to be larger than the width (height in the drawing) of the waveguide 2, and the outer wall of the waveguide 2. The waveguide 2 can be firmly fixed in the insertion space 14 by inserting the fixing protrusion 32 formed on the lid body 30 into the gap 13 formed between the insertion wall 14 and the inner wall of the insertion space 14. Therefore, after the waveguide 2 is connected, the waveguide can be prevented from coming off from the waveguide connection fitting 1.

  In addition, slots 20 and 22 for radiating a part of the radio wave passing through the waveguide space 12 to the outside are formed in the side wall of the waveguide space 12 and the lid 30 disposed outside the side wall. Therefore, the waveguide connection fitting 1 of this embodiment can be operated as a slot antenna. For this reason, if the waveguide connection fitting 1 of this embodiment is used, a slot antenna can be realized without forming a slot in the waveguide 2, and the slot 2 is formed by forming a slot in the waveguide 2. The cost of the waveguide 2 can be reduced as compared with the case of configuring the above.

  Since the antenna gain and the directivity can be changed by changing the shape of the slots 20 and 22, a plurality of waveguide connection fittings 1 having different shapes of the slots 20 and 22 are prepared. If the waveguide connection fitting 1 to be used is appropriately selected at the time of piping, the antenna gain and directivity characteristics at the installation position of the waveguide connection fitting 1 can be set to desired characteristics.

  When it is not desired to make the waveguide connection fitting 1 function as a slot antenna, as shown in FIG. 1, instead of the lid body 30, a lid body 31 in which the slot 22 is not formed is used. 18 may be closed.

In other words, in this way, the lid 31 in which the slot 22 is not formed is used as a shield for closing the slot 20 formed on the side wall of the waveguide space 12, and radio waves are radiated from the waveguide space 12 to the outside. Can be prevented.
[Modification 1]
In the above embodiment, the waveguide space 12 has been described as having the slot 20 formed on the side wall side where the window portion 18 is closed by the lid 30. For example, as shown in FIG. The slot 24 may be provided also on a wall surface (a lower side wall which is a bottom surface in the figure) orthogonal to the side wall on which is formed.

  In this way, the user appropriately selects whether to close the slot 20 with the lid 31 that functions as a shield or to close the slot 24 with the shield 34 that can be fitted into the slot 24. As a result, the radiation direction of the radio wave can be set, and the usability of the waveguide connection fitting 1 can be improved.

In the connection fitting main body 10 shown in FIG. 5, the positions where the slots 20 and 24 are formed are different from each other by 90 ° around the central axis along the traveling direction of the radio wave in the waveguide space 12. It may be formed on the other wall surface of the waveguide space 12 so that a slot for radiating radio waves can be selected as appropriate using the shield 34 or the like.
[Second Embodiment]
Next, a second embodiment of the present invention will be described.

  FIG. 6 is a perspective view showing the appearance of the waveguide connection fitting 7 of the second embodiment, FIG. 7 is a cross-sectional view showing the internal space of the waveguide connection fitting 7, and FIG. It is explanatory drawing showing the connection procedure of the waveguide to.

  The waveguide connection fitting 7 of the present embodiment is for connecting two waveguides 2 having a rectangular cross section so that the waveguides are orthogonal to each other. The waveguide connection fitting 1 of the first embodiment. The difference is that the connection fitting main body 10 is formed in an L shape, and the waveguide space 12 is formed in an L shape from the corner of the L shape toward the outside.

  That is, in the waveguide connection fitting 1 of the first embodiment, the waveguide space 12 is formed in a straight line so that the central axis of the waveguide connecting the two open ends 11 of the waveguide space 12 forms a straight line. On the other hand, in the waveguide fitting 7 according to the second embodiment, the waveguide space 12 is so bent that the central axis of the waveguide connecting the two open ends 11 of the waveguide space 12 is bent at a substantially right angle. Is formed in an L shape.

In the two open ends 11 of the waveguide space 12, a fitting space 14 and a guide space 16 are formed, respectively, as in the above embodiment.
Further, in the connection fitting main body 10, a window portion 18 for confirming the tip position of the waveguide 2 inserted into each insertion space 14 is formed on the side wall of each insertion space 14 from the outside of the connection fitting main body 10. Has been. As shown in FIG. 8B, the width (height in the figure) of each insertion space 14 is the width of the waveguide 2 (in the figure, as in the first embodiment) when viewed from the window 18. It is larger than (height).

  Moreover, since the connection metal fitting body 10 is formed in an L shape and the window portion 18 is formed on the outer surface of the L shape (that is, a different surface), the lid body 30 that closes the window portion 18 is: Two windows are provided corresponding to each window 18.

  The lid 30 is also formed between the waveguide 2 fitted in the fitting space 14 and the inner wall of the fitting space 14 when the window 18 is closed by being fitted to each window 18. A fixing protrusion 32 is formed which is inserted into the gap 13 (see FIG. 8B) and fixes the distal end of the waveguide 2 in the fitting space 14.

  Therefore, according to the waveguide connection fitting 7 of the present embodiment, as shown in FIG. 8B, the waveguide 2 is connected from the guide spaces 16 formed at both ends of the L-shape to the respective insertion spaces 14. Inserting and bringing the tip of the waveguide 2 into contact with the stepped portions formed on the respective opening end sides of the waveguide space 12 formed so that the opening surfaces face in directions different by 90 ° will guide the waveguide. A continuous L-shaped waveguide is formed from the waveguide 4 of the tube 2 to the waveguide space 12.

  Further, since a window portion 18 is provided on the side wall of the insertion space 14 and the window portion 18 can be closed by the lid 30, the user can introduce the guide inserted into the insertion space 14 as in the above embodiment. The distal end position of the wave tube 2 can be confirmed from the outside of the connection fitting main body 10, and the distal end portion of the waveguide 2 can be protected using the lid 30 after the waveguide 2 is connected.

  Further, since the fixing projection 32 is formed on the lid 30, when the window portion 18 is closed with the lid 30, the distal end of the waveguide 2 is inserted into the insertion space 14 by the fixing projection 32. It is possible to prevent the waveguide 2 from coming off from the waveguide connection fitting 7.

  Further, as shown in FIG. 7, a part of the high-frequency signal passing through the waveguide space 12 is radiated to the surroundings on the side walls of the straight portions of the waveguide space 12 forming the L-shaped waveguide. A slot 20 is formed.

For this reason, according to the waveguide connection fitting 7 of this embodiment, it can be used as a slot antenna that can radiate radio waves in directions different from each slot 20 by approximately 90 °.
Further, if each slot 20 is shielded by the shield 34 shown in the modified example 1, it can be used as a simple waveguide connecting bracket, or if only one slot 20 is shielded by the shield 34, Radio wave radiation characteristics can be set in a desired direction.

As in the first modification, a pair of slots 20 may be provided in directions different by 90 ° around the central axis of the waveguide. In FIG. 7, the slot 20 is provided outside the L-shape of the waveguide space 12. However, the slot 20 may be formed inside the L-shape. Then, the slot 20 to be used as an antenna may be selected.
[Third Embodiment]
Next, a third embodiment of the present invention will be described.

  FIG. 9 is a perspective view showing the appearance of the waveguide connection fitting 9 of the third embodiment, FIG. 10 is a cross-sectional view showing the internal space of the waveguide connection fitting 9, and FIG. It is explanatory drawing showing the connection procedure of the waveguide to.

  The waveguide connection fitting 9 of the present embodiment is for connecting three waveguides 2 having a rectangular cross section in a T shape, and the waveguide connection fitting 1 of the first and second embodiments. , 7 is that the connection fitting main body 10 is formed in a T shape, and the waveguide space 12 is formed in a T shape from the central portion of the T shape toward the outside.

  That is, in the waveguide connection fitting 9 of the present embodiment, the waveguide space 12 is provided with three opening ends 11 so that the central axis of the waveguide connecting the opening ends 11 has a T shape. In addition, a waveguide space 12 is formed.

In the three open ends 11 of the waveguide space 12, a fitting space 14 and a guide space 16 are formed as in the above embodiment.
Further, in the connection fitting main body 10, a window portion 18 for confirming the tip position of the waveguide 2 inserted into each insertion space 14 is formed on the side wall of each insertion space 14 from the outside of the connection fitting main body 10. Has been.

  Two window portions 18 are formed in the straight portion extending linearly outward from the center portion of the T-shape, and one is formed in a portion branched from the straight portion. Therefore, the lid body 30 that closes the window portion 18 is formed. The first embodiment closes the two window portions 18 formed in the straight portion at the same time as the first embodiment, and the second embodiment closes the one window portion 18 formed in the branch portion. Two types of lids 30 having substantially the same shape are prepared.

  The lids 30 are also formed between the waveguide 2 fitted in the fitting space 14 and the inner wall of the fitting space 14 when the lids 30 are fitted to the window portions 18 to close the window portions 18. A fixing protrusion 32 is formed to be inserted into the gap 13 to fix the tip of the waveguide 2 in the insertion space 14.

  Therefore, according to the waveguide fitting 9 of the present embodiment, as shown in FIG. 11A, the waveguide 2 extends from the guide space 16 formed at each end of the T-shape to each insertion space 14. Is inserted, and the tips of the waveguides 2 are brought into contact with the stepped portions formed on the respective open ends 11 side of the waveguide space 12, the waveguides 4 of the three waveguides 2 are made T-shaped. Can be connected continuously.

  Further, as in the above embodiments, a window 18 is provided on the side wall of the insertion space 14, and the window 18 can be closed with a lid 30 (see FIG. 11B). The distal end position of the waveguide 2 inserted into the insertion space 14 can be confirmed from the outside of the connection fitting body 10. After the waveguide 2 is connected, the lid 30 is used to connect the waveguide 2. The tip portion can be protected.

  Further, since the fixing projection 32 is formed on the lid 30, when the window 18 is closed with the lid 30, the gap between the waveguide 2 and the insertion space 14 is inserted into the fixing projection 32. 13, the waveguide 2 is firmly fixed in the insertion space 14, and the waveguide 2 can be prevented from coming off the waveguide connection fitting 9.

  As described above, the waveguide fitting 1 according to the first embodiment has the two opening ends 11 formed so that the opening surfaces are directed in directions different from each other by 180 °, thereby forming a linear waveguide. In the waveguide connection fitting 7 of the second embodiment, the L-shaped waveguide has two opening ends 11 formed so that the opening surfaces face in directions different by 90 °. In the waveguide connection fitting 9 of the third embodiment, there are two opening ends formed so that the opening surfaces are directed in directions different from each other by 180 °, and the opening ends with respect to these opening ends. The waveguide connecting bracket of each of these embodiments is provided with a waveguide space 12 having a single open end formed so that the planes face in directions different by 90 ° and forming a T-shaped waveguide. If 1, 7 and 9 are used in appropriate combination, the waveguide can be used in buildings. It is possible to pipe the desired path.

  Further, as shown in FIG. 10, in the waveguide fitting 9 of the present embodiment, the straight portion that straightly connects the two open ends 11 of the waveguide space 12 forming the T-shaped waveguide is not provided. Each of the open ends 11 is formed with a slot 20 and the window 18 is provided with a lid 30 having a slot 22 corresponding to each slot 20 so that radio waves can be emitted from the two slots 20. Yes.

  In the waveguide connection fitting of the present embodiment, slots 20 are also formed on the side walls on both sides of the waveguide space 12 that forms the central straight portion of the T-shape. For this reason, the two slots 20 can be used to radiate radio waves in directions different from each other by 180 °.

  As in the first modification, the slot 22 may be provided in a direction different by 90 ° around the central axis of the waveguide with respect to the slot 20 shown in FIG. Also good.

That is, the slot 20 may be formed anywhere as long as it is the side wall of the waveguide space 12, or a plurality of slots 20 may be continuously formed on the side of the straight line forming the waveguide space. However, when a plurality of slots 20 are continuously formed, the interval needs to be ½ or more of the wavelength of the radiated radio wave.
[Modification 2]
In each of the above embodiments, the waveguide connection fittings 1, 7, 9 have been described as connecting the waveguide 2 having a rectangular cross section (specifically, a rectangle), but the waveguide connection fitting of the present invention is Even if the cross section of the waveguide is square, circular or elliptical, the guide space 16, the insertion space 14, and the waveguide space 12 are formed according to the cross-sectional shape of the above-described embodiment. The same effect can be obtained with the same configuration.

  For example, FIG. 12 shows an improvement of the linear waveguide connector 1 of the first embodiment to one that connects the waveguide 2 having a circular cross section. As is apparent from this figure. If the guide space 16, the fitting space 14, and the waveguide space 12 are made circular corresponding to the cross-sectional shape of the waveguide 2, the waveguide connection fitting 1 for circular waveguide connection can be configured.

In this case, the outer shape of the waveguide connection fitting 1 may be rectangular as in the first embodiment, but in FIG. 12, the outer shape of the waveguide connection fitting 1 also corresponds to the waveguide 2. To make it cylindrical. When the outer shape of the waveguide connection fitting 1 is thus cylindrical, as shown in FIG. 12, the outer wall of the lid 30 also has an arcuate cross section in accordance with the shape of the connection fitting main body 10. do it.
[Modification 3]
In each of the above-described embodiments, the insertion space 14 is formed so that the width of the insertion space 14 is larger than the width of the waveguide 2 when viewed from the window portion 18. A gap 13 is formed in one of the opposing portions of the outer wall of the wave tube 2 and the inner wall of the insertion space 14, and a fixing protrusion 32 formed on the lid 30 is inserted into the gap 13, thereby 2 can be fixed in the insertion space 14.

  However, for example, as shown in FIG. 13, when the waveguide 2 is inserted into the insertion space 14, a gap 13 is formed on both sides of the facing portion between the outer wall of the waveguide 2 and the inner wall of the insertion space 14. The waveguide 2 may be fixed in the insertion space 14 by inserting a pair of fixing protrusions 32 formed at both ends of the lid 30 into the two gaps 13.

FIG. 13 shows an improvement of the linear waveguide connection fitting 1 of the first embodiment, but such an improvement is the waveguide connection fitting 7 of the second and third embodiments, 9 or the waveguide fitting 1 according to the second modification can be similarly performed.
[Modification 4]
Next, the fixing protrusion 32 provided on the lid body 30 is inserted into the gap between the outer wall of the waveguide 2 and the inner wall of the insertion space 14, so that the waveguide 2 is inserted into the insertion space 14. However, it is also conceivable that sufficient pressure cannot be applied to the waveguide 2 due to dimensional errors, changes with time, and the like, and the waveguide 2 is likely to come off.

  Therefore, the fixing protrusion 32 is inserted into the outer wall of the waveguide 2 on the outer wall of the distal end portion of the waveguide 2 inserted into the insertion space 14 and the wall surface of the fixing protrusion 32 abutted against the outer wall. When inserted into the gap between the inner wall of the space 14, a concave / convex portion that fits each other and positions and fixes them may be provided.

  For example, FIG. 14A shows a waveguide that is fixed in the fitting space 14 of the connection fitting main body 10 by the lid 30 of Modification 3 and a pair of fixing protrusions 32 provided on the lid 30. Although the tube 2 is shown, as shown in the figure, one or a plurality of (two in the figure) recesses 2a are provided on the upper and lower wall surfaces sandwiched between the pair of fixing protrusions 32 in the waveguide 2, Protrusions 32a that can be fitted into the recesses 2a are provided on the opposing surfaces of the pair of fixing protrusions 32, respectively.

  In this way, the waveguide 2 is inserted into the fitting space 14 of the connection fitting body 10, and the fixing protrusion 32 is inserted into the gap between the outer wall of the waveguide 2 and the inner wall of the fitting space 14. When inserted, the protrusion 32a is inserted into the recess 2a as shown in FIG. 14B, and the fixing protrusion 32 and the waveguide 2 are firmly connected in the insertion space 14, and these are inserted into the insertion space. 14 can be prevented from coming off.

Note that, when the waveguide 2 having a circular cross section is fixed by the fixing protrusion 32 of the lid 30 as in the connection fitting 1 of Modification 2, the waveguide 2 can rotate around the central axis. Even if the concave portion 2 a is formed in the waveguide 2, it is difficult to position the concave portion 2 a at a position corresponding to the convex portion 32 a provided on the fixing protrusion 32. Therefore, in this case, as shown in FIG. 14C, a convex portion 32a may be provided only on the fixing projection 32, and the waveguide 2 may be fixed by the convex portion 32a.
[Experimental example]
Next, since the passage loss and the radiation characteristic from the slot that occur when two waveguides 2 having a rectangular cross section are connected using the connection fitting 1 of the first embodiment are measured, as an experimental example of the present invention explain.

  In this experimental example, as shown in FIG. 15 (a), a waveguide 2 for transmitting signals in the millimeter wave band of 58 GHz to 66 GHz is guided with an outer dimension of 4 mm × 6 mm, an inner dimension of 2 mm × 4 mm, and a length of 50 mm. A wave tube 2 was prepared, and a connection fitting 1 having a total length of 25 mm and a waveguide length of 5 mm in the waveguide space 12 was used as a connection fitting 1 for connecting the wave tube 2. The inner dimension of the waveguide space 12 and the inner dimension of the guide space 14 including the lid 30 correspond to the inner dimension and the outer dimension of the waveguide 2.

  Then, the slot 20 was shielded by the lid 31, and the passage loss of a signal of 58 GHz to 66 GHz from the open end of one waveguide 2 to the open end of the other waveguide 2 was measured. The measurement result is shown by a solid line in FIG.

  As apparent from FIG. 15 (b), according to the connection fitting 1 of the first embodiment, it is substantially the same as the passage loss (indicated by the dotted line) of the waveguide 2 alone that does not use the connection fitting. It has been found that it can be sufficiently used as a connection fitting for the waveguide 2.

  Note that the passage loss of the waveguide 2 alone that does not use the connection fitting indicated by the dotted line in FIG. 15B is that the length of the waveguide 2 is 105 mm, and the length of the transmission path of the millimeter-wave band signal is as follows. The connection metal fitting 1 was used.

  Next, in order to use the connection fitting main body 10 as a slot antenna, the window portion 18 was closed with a lid 30 in which the slot 22 was formed, and the radiation characteristics of millimeter waves from the slots 20 and 22 were measured. The measurement results are shown in FIG.

As a result, as apparent from FIG. 16, it was found that an antenna gain of 5 dB or more can be obtained from the opening surfaces of the slots 20 and 22 within a directivity range of 100 ° or more.
The openings of the slots 20 and 22 have the same size as the inner dimension (2 mm × 4 mm) of the waveguide 2 and the waveguide space 12.

  Although the embodiments and modifications of the present invention have been described above, the present invention is not limited to the above-described embodiments and modifications, and various aspects can be adopted without departing from the scope of the present invention. Can do.

  For example, it is desirable that the connection fitting main body 10 and the lid 30 are all made of a conductive metal capable of blocking electromagnetic waves, but in order to reduce weight and cost, You may comprise by metal-plating the surface.

  In each of the above embodiments, the waveguide space 12 forming the waveguide is described as being formed in a linear shape, an L shape, or a T shape. The bending angle and shape may be changed as appropriate. For example, when the waveguide space 12 having three open ends is formed, the shape of the waveguide may be Y-shaped instead of T-shaped.

The same effect as in the above embodiment can be obtained by providing the insertion space 14 and the guide space 16 on the opening end 11 side regardless of the shape of the waveguide space 12.
Further, the window portion 18 and the lid body 30 that closes the window portion 18 are not necessarily provided, and the waveguide fitting of the present invention can be realized without providing them. Further, when the window 18 is provided, the waveguide 2 is connected to the waveguide only by making the sectional shape of the insertion space 14 coincide with the outer shape of the waveguide 2 and inserting the waveguide 2 into the insertion space 14. You may make it fix to metal fittings 1,7,9.

  DESCRIPTION OF SYMBOLS 1,7,9 ... Waveguide connection metal fitting, 2 ... Waveguide, 2a ... Recessed part, 4 ... Waveguide, 10 ... Connection metal fitting main body, 11 ... Open end, 12 ... Waveguide space, 13 ... Gap, 14 ... Insertion space, 16 ... guide space, 18 ... window, 20, 22, 24 ... slot, 30, 31 ... lid, 32 ... fixing projection, 34 ... shield, 32a ... convex.

Claims (8)

A waveguide connector for connecting a plurality of waveguides,
A plurality of open ends having the same shape as the waveguides of the respective waveguides, and a waveguide space for coupling the waveguides of the respective waveguides;
Each of the waveguides is formed so as to be able to be inserted into each opening end side of the waveguide space, and an insertion space for continuously coupling the waveguide of the inserted waveguide and the waveguide space;
A guide space that is formed so as to expand from the insertion space toward the outer wall of the waveguide connection fitting, and guides each waveguide from the outside of the waveguide connection fitting to the insertion space;
With
One or more slots for radiating a part of the radio wave passing through the waveguide space to the outside are formed on the side wall of the waveguide space.   2. The waveguide connector according to claim 1, wherein the slots are formed in directions different from each other by 90 ° around a central axis along a traveling direction of a radio wave in the waveguide space.   The waveguide connection fitting according to claim 1 or 2, wherein the waveguide connection fitting main body is configured separately from the waveguide connection fitting main body and includes a shield capable of shielding the slot.   4. The waveguide space according to claim 1, wherein the waveguide space has two open ends, and the central axis of the waveguide connecting the open ends forms a straight line. The waveguide connecting bracket according to item.   4. The waveguide space according to claim 1, wherein the waveguide space has two open ends, and the central axis of the waveguide connecting the open ends is bent at a predetermined angle. 2. A waveguide connector according to claim 1.   The waveguide space has three open ends, and a central axis of a waveguide connecting the open ends is formed to have a T shape or a Y shape. Item 4. The waveguide fitting according to any one of items 3 to 4. On the side wall of each insertion space formed on each opening end side of the waveguide space, the waveguide inserted into each insertion space from the opening surface side of the slot formed on the side wall of the waveguide space. A window for confirming the tip position is formed,
In order to simultaneously close the window portions, the waveguide connection fitting main body comprises a lid configured separately from the body,
The waveguide according to any one of claims 1 to 6, wherein the lid is formed with a slot having the same shape as a slot formed on a side wall of the waveguide space. Connection bracket. When viewed from the window, the width of the insertion space is larger than the width of the waveguide,
When the window is closed, the lid is inserted between the waveguide inserted into the insertion space and the inner wall of the insertion space to fix the tip of the waveguide in the insertion space. 8. The waveguide connection fitting according to claim 7, wherein a fixing projection is formed.

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