JP2012124651A - Non-reciprocal circuit element, communication apparatus, and manufacturing method of non-reciprocal circuit element - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a thin non-reciprocal circuit element in which accuracy of a waveguide or the like is improved, a communication apparatus using the element, and a manufacturing method of a non-reciprocal circuit element.SOLUTION: A non-reciprocal circuit element includes first and second metal members 11, 12, a ferromagnetic body 5, and a permanent magnet 3. The first metal member 11 and the second metal member 12 are joined together to constitute a flat waveguide. The waveguide has first, second and third openings 101 to 103, and first, second and third waveguides 21 to 23 which are extended from each of the first, second and third openings 101 to 103 respectively and cross at a branch point. The ferromagnetic body 5 is provided at the branch point, and the permanent magnet 3 applies a magnetic field to the ferromagnetic body 5. Each of the first, second and third waveguides 21 to 23 is partially formed on each junction surface of the first and second metal members 11, 12.

Description

  The present invention relates to a nonreciprocal circuit element such as an isolator or a circulator, a communication device using the same, and a method of manufacturing a nonreciprocal circuit element.

  Non-reciprocal circuit elements such as isolators and circulators are generally used in mobile communication devices such as mobile phones and their base stations, and the demand for them is increasing rapidly with the spread of these devices. The nonreciprocal circuit element includes a waveguide type that propagates radio waves such as microwaves and millimeter waves, and is mainly used for a radio wave transmission path disposed in a relay station of a mobile phone.

  As described in Patent Document 1, a waveguide-type nonreciprocal circuit element includes a waveguide in which a three-branch waveguide is formed and a ferromagnetic provided at a branch point of the waveguide. And a permanent magnet for applying a magnetic field to the ferromagnetic material. In this non-reciprocal circuit element, since the waveguide is integrally formed, it is difficult to process the inner waveguide through the opening after the formation, which is an obstacle to improvement in accuracy. Further, when the pedestal for disposing the ferromagnetic material is formed integrally with the waveguide, burrs may occur due to the gaps in the mold, but it is not easy to remove them.

  In order to solve this problem, the inventor decided to divide the waveguide described in Patent Document 1 into upper and lower parts, and to form and expose the waveguide and the like on the joint surface. I thought of a way to make it easier. However, as is understood with reference to FIGS. 3 and 4, the waveguide is provided with two ports (openings) on a pair of opposed plate surfaces of the plate-like metal member, and remains on the side surface. One port is provided, and the thickness is reduced in the direction connecting the two ports. Therefore, it is difficult to secure a sufficient thickness necessary for fixing this waveguide, and the individual parts that are separately formed are joined with high positional accuracy and fixed stably. It was difficult to reduce the leakage.

Japanese Utility Model Publication No. 51-121138

  An object of the present invention is to provide a thin nonreciprocal circuit element with improved accuracy of a waveguide or the like, a communication device using the same, and a method for manufacturing the nonreciprocal circuit element.

  In order to solve the above-described problems, the nonreciprocal circuit device according to the present invention includes first and second metal members, a ferromagnetic material, and a permanent magnet.

  The first metal member and the second metal member are joined to each other to form a flat waveguide. The waveguide extends from each of the first, second, and third openings and the first, second, and third openings and intersects at a branch point. And a third waveguide.

  The ferromagnetic body is provided at the branch point, and the permanent magnet applies a magnetic field to the ferromagnetic body.

  Thus, the nonreciprocal circuit device according to the present invention has a basic configuration of a three-port circulator or isolator. However, when used as an isolator, the nonreciprocal circuit element needs to further include a radio wave absorber in the third waveguide. A characteristic part of the non-reciprocal circuit device according to the present invention is in the configuration described below.

  Each of the first, second, and third waveguides is partially formed on each joint surface of the first and second metal members.

  For this reason, since the first, second, and third waveguides are exposed to the respective joint surfaces before joining the first and second metal members, they can be easily processed. The accuracy can be improved. Furthermore, it is easy to remove burrs that are generated when the pedestal for placing the ferromagnetic material is integrally formed with the waveguide.

  The first and second openings are respectively provided on a pair of opposing plate surfaces of the waveguide, and the third opening is provided on a side surface of the waveguide.

  For this reason, the thickness of the waveguide can be reduced in the direction connecting the first opening and the second opening. This is particularly effective when the non-reciprocal circuit element is used as an isolator by providing a radio wave absorbing member in the third waveguide, because the length of the radio wave propagation path in the relay station can be shortened. It is.

  Further, the first metal member and the second metal member are fitted to each other on both sides of the third waveguide, and the third metal member sandwiching the first and second waveguides is interposed between the first metal member and the second metal member. Screwed on the opposite side of the waveguide.

  Both sides of the third waveguide are relatively thin because the third opening is provided on the side surface of the waveguide. Therefore, if the fitting means is employed in this way, the first metal member and the second metal member can be stably fixed at one end of the joint surface without increasing the thickness.

  On the other hand, the opposite side of the third waveguide sandwiching the first and second waveguides is a region sandwiched between the side surface of the waveguide and the side walls of the first and second waveguides. The wall thickness can be relatively increased by expanding the plate surface. Therefore, if the screwing means is employed in this way, the first metal member and the second metal member can be stably fixed at the other end of the joint surface by effectively utilizing the thickness.

  Therefore, the non-reciprocal circuit device according to the present invention is stably fixed by joining the first metal member and the second metal member with two kinds of fixing means according to the shape and configuration with high positional accuracy. In addition, leakage of radio waves from the joint can be reduced.

  The communication device according to the present invention includes the above-described nonreciprocal circuit element and a transmission unit or a reception unit. The nonreciprocal circuit device is electrically combined with the transmission unit or the reception unit.

  Since the communication apparatus according to the present invention includes the non-reciprocal circuit element described above, the same operation and effect as this are achieved.

Furthermore, the manufacturing method of the nonreciprocal circuit device according to the present invention includes the following steps.
(A) The first metal member and the second metal member are formed independently of each other.
(B) The first metal member and the second metal member are fitted to each other on both sides of the third waveguide, and the third guide is sandwiched between the first and second waveguides. Screw on the opposite side of the waveguide.
(C) The pair of plate surfaces and the side surfaces are polished.

  According to the above step (a), since the waveguide is divided into the first metal member and the second metal member that are independent from each other, as described above, the first, second, and second metal members are formed. The three waveguides can be exposed to the joint surface, and these can be easily processed, and the accuracy can be improved. Furthermore, it is easy to remove burrs that are generated when the pedestal for placing the ferromagnetic material is integrally formed with the waveguide.

  Moreover, according to said process (b), as above-mentioned, a 1st metal member and a 2nd metal member can be fixed stably.

  Further, according to the above step (c), each surface where the boundary between the first metal member and the second metal member exists is polished, so that slight steps that may occur at the boundary are preferably removed. Can do.

  As described above, according to the present invention, it is possible to provide a thin non-reciprocal circuit element with improved accuracy such as a waveguide, a communication device using the same, and a method for manufacturing the non-reciprocal circuit element.

It is a perspective view of the nonreciprocal circuit device according to the present invention. It is a disassembled perspective view of the nonreciprocal circuit device according to the present invention. It is a top view showing the joint surface of the 1st metal member. It is a top view showing the joint surface of the 2nd metal member. It is a top view showing a part of one side surface of the 1st metal member in which a part of 3rd port was provided. It is a top view showing a part of one side surface of the waveguide provided with the 3rd port. It is a top view showing a part of one side of a waveguide provided with the 3rd port in other embodiments. It is a top view showing a part of one side of a waveguide provided with the 3rd port in other embodiments. It is a top view showing a part of one side of a waveguide provided with the 3rd port in other embodiments. It is a block diagram showing the structure of the communication apparatus which concerns on this invention.

  FIG. 1 is a perspective view of a non-reciprocal circuit device according to the present invention, and FIG. 2 is an exploded perspective view of the non-reciprocal circuit device. The nonreciprocal circuit device according to the present invention includes first and second metal members 11, 12, a ferromagnetic material 5, and a permanent magnet 3. The first metal member 11 and the second metal member 12 are joined to each other to constitute a flat waveguide. The first metal member 11 and the second metal member 12 are typically made of aluminum and are formed independently of each other.

  The waveguide is a hexahedron including a pair of opposing rectangular plate surfaces 10a and two opposing sets of rectangular side surfaces 10b to 10e. However, the shape of the waveguide is not limited to this, and may be a disc, a pentagonal plate, or a hexagonal plate.

  The waveguide extends from each of the first, second, and third openings 101-103 and the first, second, and third openings 101-103, and intersects at a branch point. It has the 2nd and 3rd waveguides 21-23. The side surfaces of the first, second, and third waveguides 21 to 23 are defined by an inner wall 24 bent in a V-shape and a pair of parallel inner walls 25, and are approximately Y-shaped. The inner wall 24 is erected on the second metal member 12 so as to be perpendicular to the joint surface. On the other hand, the inner wall 25 is provided on the first metal member 11 and is extended from the end surface of the base 110 so that the outer surface has a base 110 forming a part of the plate surface 10a and an inner surface common to the base 110. Fitting wall 111.

  The first and second openings 101 and 102 are respectively provided in a pair of opposing plate surfaces 10a of the waveguide, while the third opening 103 is provided in the front side surface 10c. Each of the openings 101 to 103 has a rectangular shape, and its width and height are determined according to the wavelength of the propagating radio wave. End portions that define the openings 101 to 103 are partially formed on the plate surface 10a and the side surface 10c in each of the first and second metal members 11 and 12.

  As described above, the waveguide has the first opening 21 and the second opening 22 formed in the pair of plate surfaces 10a, and therefore, in the direction connecting the first opening 21 and the second opening 22, The thickness can be reduced. This is because, in particular, when the non-reciprocal circuit element is used as an isolator by providing a radio wave absorbing member in the third waveguide 23, the length of the radio wave propagation path in the relay station can be reduced. It is valid.

  In addition, the ferromagnetic body 5 is sandwiched from above and below by a pair of pedestals 20 provided on the first and second metal members 11 and 12, and the first, second, and third waveguides 21 to 21 are provided. It is arranged at 23 branch points. The ferromagnetic material 5 is made of a material such as yttrium / iron / garnet (YIG), and is formed in a triangular prism shape, for example, as shown in FIG.

  3 and 4 are plan views showing the joint surfaces of the first and second metal members 11 and 12, respectively. The pedestal 20 for arranging the ferromagnetic body 5 is a triangular plate, and the first, second, and third waveguides 21 to 23 are branched in each of the first and second metal members 11 and 12. It is provided at the point. In the present embodiment, the pedestal 20 is formed integrally with the first and second metal members 11 and 12, but is not limited thereto, and is independent from the first and second metal members 11 and 12. And may be molded. When the base 20 is integrally formed with the metal members 11 and 12, the base 20 serves as an index of arrangement, and therefore can be used for positioning of the ferromagnetic body 5. Needless to say, an adhesive means such as an adhesive may be used when the ferromagnetic body 5 is disposed on the base 20.

  The permanent magnet 3 applies a magnetic field to the ferromagnetic material 5. The permanent magnet 3 has a cylindrical shape, is accommodated in a cylindrical accommodation hole 11b provided on the upper side surface 10b of the first metal member 11, and is fixed to the inner wall thereof with an adhesive. The storage hole 11b is formed above the pedestal 20 so that the magnetic force generated by the permanent magnet 3 is effectively applied to the ferromagnetic body 5.

  Thus, the nonreciprocal circuit device according to the present invention has a basic configuration of a three-port circulator or isolator. However, when used as an isolator, the nonreciprocal circuit device needs to be further provided with a radio wave absorber in the third waveguide 23.

  As a characteristic point of the nonreciprocal circuit device according to the present invention, first, each of the first, second, and third waveguides 21 to 23 is connected to each of the first and second metal members 11 and 12. It is partially formed on the surface. Specifically, the upper and lower surfaces of each of the waveguides 21 to 23 are formed on a part of the joint surface, while the side surfaces of the waveguides 21 to 23 are the side walls of the second metal member 12 as described above. 24 and a pair of side walls 25 of the first metal member 11.

  For this reason, the first, second, and third waveguides 21 to 23 are exposed to the bonding surfaces before the first and second metal members 11 and 12 are bonded. It can be processed and its accuracy can be improved. Furthermore, it is easy to remove burrs that are generated when the pedestal 20 is formed integrally with the waveguide.

  The most characteristic point of the non-reciprocal circuit device according to the present invention resides in the joining means of the first metal member 11 and the second metal member 12. The first metal member 11 and the second metal member 12 are fitted to each other on both sides of the third waveguide 23, and the third conductor is sandwiched between the first and second waveguides 21 and 22. Screwed on the opposite side of the waveguide 23.

  As the screwing means, first, the second metal member 12 is provided with a screw hole 12a between the outer surface 10d of the inner wall 24 waveguide as shown in FIG. On the other hand, as shown in FIG. 3, the first metal member 11 is provided with a screw hole 11a between the first and second waveguides 21 and 22 and the outer surface 10d of the waveguide. The positions of the screw holes 11 a and 12 a correspond to each other. As shown in FIG. 1, when the first and second metal members 11 and 12 are joined, the screw holes 11 a and 12 a are screwed with the screw 4. Is done.

  The opposite side of the third waveguide 23 sandwiching the first and second waveguides 21 and 22 is sandwiched between the side surface 10d of the waveguide and the side walls 24 of the first and second waveguides 21 and 22. Therefore, the wall thickness can be relatively increased by expanding the plate surface 10a. Therefore, if the screwing means 4, 11a, and 12a are employed in this way, the first metal member 11 and the second metal member 12 are stably fixed at one end of the joint surface by effectively using the wall thickness. can do.

  In addition, positioning portions 11c and 12b are respectively provided on the same surface where the screw holes 11a and 12a are formed at intervals. That is, as shown in FIG. 2, the first metal member 11 is provided with a concave portion 11c, and the second metal member 12 is provided with a convex portion 12b. And by fitting these at the time of joining, the 1st and 2nd metal members 11 and 12 can be positioned mutually, and screw holes 11a and 12a can be aligned correctly.

  However, on the contrary, the first metal member 11 may be provided with a convex portion, and the second metal member 12 may be provided with a concave portion. Furthermore, it is needless to say that the shapes of the concave portion 11c and the convex portion 12b are not limited to the illustrated cylindrical shape, and may be, for example, a rectangular column shape.

  On the other hand, as fitting means, a pair of fitting walls 111 and 120 are provided on the first and second metal members 11 and 12, respectively. As shown in FIG. 5, the fitting wall 111 of the first metal member 11 is formed to be thinner than the base 110, and the groove that forms the upper surface and the side surface of the third waveguide 23 together with the base 110. The side wall 25 of 103a is formed. As shown in FIG. 6, the fitting walls 120 of the second metal member 12 are both side walls of the groove 103 b whose bottom surface constitutes the lower surface of the third waveguide 23.

  As shown in FIG. 5, the fitting wall 111 is inclined outwardly from a reference line L extending from the inner surface of the base 110. For this reason, when joining the first and second metal members 11 and 12, it is necessary to fit the groove 103 b of the second metal member 12 while bending the fitting wall 111. At this time, the fitting wall 111 is urged toward both sides of the groove portion 103b, that is, toward the fitting wall 120, as indicated by the symbol F in FIG. Therefore, the first metal member 11 is fixed with the fitting wall 111 in close contact with the fitting wall 120 of the second metal member 12.

  Further, since the fitting wall 120 of the second metal member 12 is erected perpendicularly to the bottom surface of the groove portion 103b, the fitted wall 111 fitted in accordance therewith is also perpendicular. As a result, the fitting wall 111 and the both side walls 110 constitute a series of flat side walls 25 with no boundary, and therefore, the propagation characteristics of the radio wave propagating through the third waveguide 23 are not adversely affected. Here, the same can be said for the first and second waveguides 21 and 22 because the side wall 24 forms a series of flat side walls without any boundary.

  Both sides of the third waveguide 23 are relatively thin because the third opening 103 is provided in the side surface 10c of the waveguide, but the fitting means 111 and 103b are used in this way. For example, the first metal member 11 and the second metal member 12 can be stably fixed at one end of the joint surface without increasing the thickness.

  In order to further stabilize this fitting, for example, a configuration as shown in FIG. 7 can be adopted. That is, the locking claw 112 is provided at the end of the fitting wall 111, and the locking holes 121 for locking the locking claw 112 are provided in the both side walls 120 of the groove 103b. At this time, the locking claw 112 and the locking hole 121 may be provided over the entire length of the third waveguide 23 or may be provided only in a part of the length. Here, when the latter is adopted, the first metal member 11 and the second metal member 12 can be accurately aligned in the direction in which the third waveguide 23 extends.

  According to the locking means 112 and 121, not only the fitting by the fitting walls 111 and 120 described above is further stabilized, but also the slope 112a having a gentle curve is formed on the locking claw 112. Thereby, the fitting operation | work of the fitting wall 111 to the groove part 103b can be made easy.

  In addition, the fitting walls 111 and 120 shown in FIGS. 6 and 7 are such that when the first metal member 11 and the second metal member 12 are joined, the joint surfaces of the fitting walls 111 and 120 with respect to the bottom surfaces of the grooves 103a and 103b Although it is substantially perpendicular, for example, as shown in FIG.

  In this embodiment, the fitting walls 114 and 123 of the first and second metal members 11 and 12 are formed so that the thickness increases as they move away from the bottom surfaces of the respective groove portions 103a and 103b. For this reason, the fitting walls 114 and 123 are fitted so as to bite into each other, and thus, the first metal member 11 and the second metal member 12 can be stably fixed at one end of the joint surface. .

  In the embodiments described so far, both the first metal member 11 and the second metal member 12 are provided with fitting walls. For example, as shown in FIG. 9, only one of them is fitted. A wall 113 may be provided.

  In this embodiment, the fitting wall 113 extends from the end of the extended base 110 and is fitted into a pair of fitting grooves 122 formed on the joint surface of the second metal member 12. At this time, the fitting wall 113 can stably fix the first metal member 11 and the second metal member 12 regardless of the direction of the outer side or the inner side with respect to the groove 103a. .

  In the fitting means described so far, the fitting walls 111 and 113 are provided on the first metal member 11, but conversely, they may be provided on the second metal member 12. Of course, in this case, it is needless to say that the other fitting wall 120 and the fitting groove 122 need to be provided in the first metal member 11. Similarly, the side walls 24 of the first and second waveguides 21 and 22 may be provided on the first metal member 11.

  As described above, the nonreciprocal circuit device according to the present invention stably joins the first metal member and the second metal member with two kinds of fixing means according to the shape and configuration thereof, with high positional accuracy. In addition, leakage of radio waves from the joint can be reduced. Needless to say, an adhesive may be used as necessary in joining the first metal member and the second metal member.

  Next, a method for manufacturing the nonreciprocal circuit device according to the present invention will be described. In manufacturing, first, the first metal member 11 and the second metal member 12 described above are formed independently of each other.

  According to this process, since the waveguide is divided into the first metal member 11 and the second metal member 12 which are independent from each other, as described above, the first, second, and third metal waveguides are formed. The waveguides 21 to 23 are exposed to the joint surface, and these can be easily processed, and the accuracy can be improved. Furthermore, it is easy to remove burrs that are generated when the pedestal 20 is formed integrally with the waveguide.

  Next, the bonding surfaces of the first metal member 11 and the second metal member 12 are opposed to each other, and the first metal member 11 is pressed against the second metal member 12 (see direction D in FIG. 2). . At this time, the ferromagnetic body 5 is disposed on the base 20 of the second metal member 12. If necessary, the ferromagnetic material 5 may be bonded and fixed to the base 20 with an adhesive or the like.

  Then, the first metal member 11 and the second metal member 12 are positioned with each other by fitting the convex portion 12b into the concave portion 11c, and the first metal member 11 and the second metal member 12 are 3 on both sides of the waveguide 23. That is, the pair of fitting walls 111 of the first metal member 11 is fitted into the groove portion 103 b of the second metal member 12.

  Further, the first metal member 11 and the second metal member 12 are screwed on the opposite side of the third waveguide 23 across the first and second waveguides 21 and 22. That is, the screw 4 is screwed into the screw holes 11a and 12a.

  According to this step, as described above, the first metal member 11 and the second metal member 12 can be stably fixed, and the ferromagnetic body 5 is sandwiched between the pair of bases 20 and stable. Can be held in.

  Next, the plate surface 10a and the side surfaces 10c and 10d are polished. As a grinding | polishing means, a diamond grindstone etc. are employable, for example.

  According to this process, since each surface 10a, 10c, 10d in which the boundary of the 1st metal member 11 and the 2nd metal member 12 exists is polished, the slight level difference which may arise in this boundary is removed suitably. be able to.

  Next, the communication apparatus according to the present invention will be described. FIG. 5 is a block diagram showing a configuration of a communication apparatus using the nonreciprocal circuit device according to the present invention.

  This communication apparatus is provided in a relay station in a mobile communication system, for example, and includes a transmission unit 6, the above-described irreversible circuit element 1, and an antenna 8. These are connected to each other by a waveguide that propagates radio waves.

  The transmission unit 6 includes a transmission circuit 61 that generates an audio signal, a video signal, and the like, and a power amplification circuit 62.

  Further, the nonreciprocal circuit element 1 is provided with the radio wave absorber 9 in the third waveguide 23 and functions as an isolator. That is, the isolator 1 propagates the radio wave Wt from the transmission unit 6 to the antenna 8, while absorbing the reflected wave Wr from the antenna 8 by the radio wave absorber 9 and does not propagate this to the power amplifier circuit 62. . Thereby, the isolator 1 protects the power amplifier circuit 62 from the reflected wave Wr having a large power.

  Although the transmission unit 6 is illustrated in the configuration of the present embodiment, it goes without saying that a reception unit may be provided instead of or in addition to this. In this case, the nonreciprocal circuit device according to the present invention must be used not only as an isolator but also as a circulator.

  According to the communication device of the present invention, since the non-reciprocal circuit element described above is included, the same effects as those already described can be obtained.

  Although the contents of the present invention have been specifically described above with reference to the preferred embodiments, it is obvious that those skilled in the art can take various modifications based on the basic technical idea and teachings of the present invention. It is.

DESCRIPTION OF SYMBOLS 1 Nonreciprocal circuit element 11 1st metal member 12 2nd metal member 20 Base 21-23 1st-3rd waveguide 3 Permanent magnet 4 Screw 5 Ferromagnetic material 6 Transmitting part 10a Plate surface 10b-10e Side surface 11a , 12a Screw holes 11c, 12b Positioning portions 101-103 First to third openings 103a, 103b Groove portions 111, 113, 120 Fitting walls 112 Locking claws 121 Locking holes

Claims (9)

A non-reciprocal circuit device including first and second metal members, a ferromagnetic material, and a permanent magnet,
The first metal member and the second metal member are joined together to form a flat plate-shaped waveguide,
The waveguide extends from each of the first, second, and third openings and the first, second, and third openings and intersects at a branch point. A third waveguide,
The ferromagnetic body is provided at the branch point,
The permanent magnet applies a magnetic field to the ferromagnetic material,
Each of the first, second, and third waveguides is partially formed on each joint surface of the first and second metal members,
The first and second openings are respectively provided on a pair of opposing plate surfaces of the waveguide, and the third opening is provided on a side surface of the waveguide.
The first metal member and the second metal member are fitted to each other on both sides of the third waveguide, and the third waveguide sandwiching the first and second waveguides Screwed on the opposite side of
Non-reciprocal circuit element. The non-reciprocal circuit device according to claim 1,
One or more pedestals for installing the ferromagnetic material;
The pedestal is formed integrally with the first metal member and / or the second metal member,
Non-reciprocal circuit element. A non-reciprocal circuit device according to claim 1 or 2,
The waveguide has a storage hole for storing the permanent magnet.
Non-reciprocal circuit element. A non-reciprocal circuit device according to any one of claims 1 to 3,
Each of the first and second metal members has a groove portion constituting the third waveguide on the joint surface,
One of the groove portions has a fitting wall extending from both side walls thereof,
The fitting wall is fitted in the other of the groove portions,
Non-reciprocal circuit element. A non-reciprocal circuit device according to claim 4,
The fitting wall is biased toward both sides of the groove,
Non-reciprocal circuit element. A non-reciprocal circuit device according to claim 4 or 5,
The fitting wall is provided with a locking claw at its end,
The locking claw is locked in locking holes provided in both side walls of the other groove portion,
Non-reciprocal circuit element. A non-reciprocal circuit device according to any one of claims 1 to 6,
The first metal member and the second metal member are positioned relative to each other by a positioning portion provided on the opposite side of the third waveguide across the first and second waveguides.
Non-reciprocal circuit element. A communication device including the nonreciprocal circuit device according to any one of claims 1 to 7, and a transmission unit or a reception unit,
The nonreciprocal circuit device is electrically combined with the transmitter or the receiver.
Communication device. A method for manufacturing a nonreciprocal circuit device according to any one of claims 1 to 7,
Forming the first metal member and the second metal member independently of each other;
The first metal member and the second metal member are fitted to each other on both sides of the third waveguide, and are opposite to the third waveguide across the first and second waveguides. Screw on the side,
Polishing the set of plate surfaces and the side surfaces,
A method for manufacturing a nonreciprocal circuit device.

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