Connection Structure and Connection Method of Dielectric Waveguide

Abstract

To provide a connection structure and a connection method for dielectric waveguides 10A and 10B that are advantageous in ensuring the quality of transmitted high-frequency signals.SOLUTION: One end in the longitudinal direction of one dielectric waveguide 10A of two dielectric waveguides 10A and 10B is formed by a first inclined plane 12A inclined at a predetermined angle θ with respect to an orthogonal plane P perpendicular to the longitudinal direction, and one end in the longitudinal direction of the other dielectric waveguide 10B of the two dielectric waveguides 10A and 10B is formed by a second inclined surface 12B inclined at the same angle θ as the first inclined surface 12A. The first inclined surface 12A and the second inclined surface 12B are held in a state in which an axis 14A of the one dielectric waveguide 10A is aligned with an axis 14B of the other dielectric waveguide 10B.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a connection structure and a connection method for a dielectric waveguide.

Background Art

[0002] A dielectric waveguide (dielectric line) is used as one of the structures for transmitting high-frequency signals such as millimeter waves and sub-millimeter waves. The dielectric waveguide is formed of a dielectric, and a high-frequency signal propagates inside while being reflected.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, when it becomes necessary to connect another dielectric waveguide to a certain dielectric waveguide, as a connection method for the two dielectric waveguides, after cutting the longitudinal end portions of the respective dielectric waveguides along a plane orthogonal to the longitudinal direction to form end faces, it is known to join the two end faces in a state where the axes of the two dielectric waveguides are aligned with each other. However, in such a connection method, high-frequency signals are likely to be reflected at the joined end face portions, resulting in attenuation (loss) of the high-frequency signals, which is disadvantageous in ensuring the quality of the high-frequency signals to be transmitted. The present invention has been made in view of such circumstances, and an object thereof is to provide a connection structure and a connection method for a dielectric waveguide that are advantageous in ensuring the quality of high-frequency signals to be transmitted.

Means for Solving the Problems

[0005] In order to achieve the above object, one embodiment of the present invention is a connection structure of two dielectric waveguides, wherein one end in the longitudinal direction of one of the two dielectric waveguides is formed by a first inclined surface that is inclined at a predetermined angle with respect to an orthogonal plane orthogonal to the longitudinal direction, and one end in the longitudinal direction of the other of the two dielectric waveguides is formed by a second inclined surface that is inclined at the same angle as the first inclined surface, and it is characterized by having a holding structure that holds the first inclined surface and the second inclined surface together. Further, one embodiment of the present invention is a method of connecting two dielectric waveguides, wherein one end in the longitudinal direction of one of the two dielectric waveguides is formed by a first inclined surface that is inclined at a predetermined angle with respect to an orthogonal plane orthogonal to the longitudinal direction, one end in the longitudinal direction of the other of the two dielectric waveguides is formed by a second inclined surface that is inclined at the same angle as the first inclined surface, and it is characterized by holding the first inclined surface and the second inclined surface together.

Advantages of the Invention

[0006] According to one embodiment of the present invention, since the two dielectric waveguides are held in a state where the first inclined surface and the second inclined surface that are inclined at a predetermined angle with respect to an orthogonal plane orthogonal to their longitudinal directions are combined, compared with the prior art, the attenuation (loss) of the high-frequency signal generated by being reflected by the first and second inclined surfaces can be suppressed, the attenuation of the high-frequency signal transmitted through the two connected dielectric waveguides can be suppressed, which is advantageous for ensuring the quality of the high-frequency signal.

Brief Description of the Drawings

[0007]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Embodiments for Carrying Out the Invention

[0008] Embodiments of the connection structure of the dielectric waveguide of the present invention will be described below with reference to the drawings together with the joining method. First, the dielectric waveguide will be described. The dielectric waveguide is a structure used, for example, to transmit a high-frequency signal (radio wave) with a wavelength λ of about 0.1 mm to 1 mm, called a submillimeter wave, and a frequency f of about 300 GHz to 3000 GHz. Such submillimeter waves have attracted attention as high-frequency signals used in 5G (the fifth-generation mobile communication system) and 6G (the sixth-generation mobile communication system), which is the next generation of 5G. The dielectric waveguide has a uniform rectangular or uniform circular cross-sectional shape and is formed in a long shape, and the high-frequency signal propagates while reflecting inside the dielectric waveguide along its longitudinal direction. The dielectric constituting the dielectric waveguide is composed of a conventionally known synthetic resin material such as fluororesin or polyethylene. The dielectric waveguide includes a core portion and a clad portion that covers the periphery of the core portion and has a lower dielectric constant than the core portion. In this embodiment, the case where the clad portion is composed of an air layer covering the periphery of the core portion will be described. That is, the dielectric waveguide is composed of a core portion and an air layer covering the periphery of the core portion. In the following description, the dielectric waveguide means the core portion constituting the dielectric waveguide. Incidentally, the present invention is of course applicable to a dielectric waveguide in which the clad portion is made of a dielectric having a lower dielectric constant than the core portion.

[0009] (First Embodiment) Next, a connection structure and a connection method of the dielectric waveguide (a connection structure and a connection method of the core portion constituting the dielectric waveguide) will be described. As shown in FIG. 1(A), two dielectric waveguides 10A and 10B to be connected are prepared. The same dielectric waveguide is used for the two dielectric waveguides 10A and 10B. Therefore, the cross-sectional shapes and dielectric constants of the two dielectric waveguides 10A and 10B are the same. In the present embodiment, a case where each of the dielectric waveguides 10A and 10B has a rectangular (rectangular) cross-sectional shape that is the same in shape and size will be described. As shown in FIGS. 1(A) and 2, each of the dielectric waveguides 10A and 10B has a width W and a thickness T having a dimension smaller than the width W. Next, as shown in FIGS. 1(B) and 2, one end in the longitudinal direction of one of the two dielectric waveguides 10A and 10B, i.e., the dielectric waveguide 10A, is formed with a first inclined surface 12A that is inclined at a predetermined angle θ with respect to an orthogonal plane P orthogonal to the longitudinal direction, and one end in the longitudinal direction of the other of the two dielectric waveguides 10A and 10B, i.e., the dielectric waveguide 10B, is formed with a second inclined surface 12B that is inclined at the same angle θ as the first inclined surface 12A. In this example, a case where the first and second inclined surfaces 12A and 12B are inclined in a direction intersecting the width W direction of the dielectric waveguides 10A and 10B will be described. The formation of these inclined surfaces 12A and 12B is achieved by cutting the dielectric waveguides 10A and 10B using a dedicated cutting machine. The predetermined angle θ is set within a range of 2 degrees or more and less than 15 degrees based on the relationship between the refractive indices of the dielectric waveguides 10A and 10B and the refractive index of air. This can suppress the attenuation (loss) of the high-frequency signal generated by reflection at the first and second inclined surfaces 12A and 12B in the dielectric waveguides 10A and 10B after connection, and is advantageous for ensuring the quality of the high-frequency signal transmitted through the two connected dielectric waveguides 10A and 10B. In addition, if the predetermined angle θ is less than or greater than the above range, in the dielectric waveguides 10A and 10B after connection, the attenuation (loss) of the high-frequency signal generated by reflection at the first and second inclined surfaces 12A and 12B increases, and the effect of ensuring the quality of the high-frequency signal transmitted through the two connected dielectric waveguides 10A and 10B decreases.

[0010] Next, as shown in FIG. 1(C), the first inclined surface 12A and the second inclined surface 12B are held in a combined state. Specifically, the holding of the first inclined surface 12A and the second inclined surface 12B in a combined state is, as shown in FIG. 1(B), between the first inclined surface 12A and the second inclined surface 12B, with a dielectric material 16 for joining having the same dielectric constant as the dielectric waveguides 10A and 10B and a lower melting point than the dielectric waveguides 10A and 10B interposed therebetween, and the first inclined surface 12A and the second inclined surface 12B are butted against each other. In this state, the periphery of the first inclined surface 12A and the second inclined surface 12B is heated by a heater to melt the joining dielectric material 16, and then the joining dielectric material 16 is cooled and solidified, whereby the first inclined surface 12A and the second inclined surface 12B are joined. That is, the first inclined surface 12A and the second inclined surface 12B are joined by a joining layer 16A having the same dielectric constant as the dielectric waveguides 10A and 10B. Therefore, in this embodiment, the holding structure 18A for holding the first inclined surface 12A and the second inclined surface 12B in a combined state is constituted by the joining layer 16A. As a result, as shown in FIG. 1(C), the two dielectric waveguides 10A and 10B are joined in a state where the first inclined surface 12A and the second inclined surface 12B are overlapped without a gap, and one dielectric waveguide 10 formed by connecting the two dielectric waveguides 10A and 10B is constituted.

[0011] As described above, according to the present embodiment, since the first inclined surface 12A and the second inclined surface 12B are held in a combined state, compared with the case of joining the end faces cut along the plane orthogonal to the longitudinal direction of the dielectric waveguides 10A and 10B, it is possible to suppress the attenuation (loss) of the high-frequency signal generated by being reflected by the first and second inclined surfaces 12A and 12B, which is advantageous in ensuring the quality of the high-frequency signal transmitted through the two connected dielectric waveguides 10A and 10B.

[0012] Next, a modified example shown in FIG. 3 will be described. In the above-described embodiment, the case where the first and second inclined surfaces 12A and 12B are inclined in a direction intersecting the width W direction of the dielectric waveguides 10A and 10B has been described. However, in the modified example, the first and second inclined surfaces 12A and 12B are inclined in a direction intersecting the thickness T direction of the dielectric waveguides 10A and 10B. Even in such a modified example, two dielectric waveguides 10A and 10B are joined to form one dielectric waveguide 10 in the same manner as in the above-described embodiment, and the same effects as in the embodiment are achieved.

[0013] (Second Embodiment) Next, a second embodiment will be described with reference to FIG. 4. In the following embodiments, the same parts and members as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted or simplified, and the points different from the first embodiment will be mainly described. The second embodiment is different from the first embodiment in the configuration of the holding structure 18B, and the holding structure 18B includes a holding member 20. The holding member 20 has a cylindrical shape with a rectangular frame-shaped cross section through which a mounting hole 2002 is formed. Various conventionally known materials such as a metal material and a synthetic resin material can be adopted for the holding member 20. The mounting holes 2002 have substantially the same cross-sectional shape as the dielectric waveguides 10A and 10B, and are formed such that the dielectric waveguides 10A and 10B can be inserted and removed, and the inserted state of the dielectric waveguides 10A and 10B is maintained by the friction with the dielectric waveguides 10A and 10B when the dielectric waveguides 10A and 10B are inserted. It is optional, for example, to attach a material having a large coefficient of friction to the inner peripheral surface of the mounting hole 2002 with respect to the dielectric waveguides 10A and 10B.

[0014] According to the second embodiment, one end in the longitudinal direction of the dielectric waveguides 10A and 10B is inserted into the mounting holes 2002 from both ends of the mounting holes 2002, respectively, and the first inclined surface 12A and the second inclined surface 12B are aligned. Thereby, in a state where the axis 14A of the portion of the dielectric waveguide 10A where the first inclined surface 12A is formed and the axis 14B of the portion of the dielectric waveguide 10B where the second inclined surface 12B is formed are aligned within the mounting hole 2002, the first inclined surface 12A and the second inclined surface 12B are combined and held in a combined state. Therefore, similar to the first embodiment, compared with the case of joining the end faces cut along the plane orthogonal to the longitudinal direction of the dielectric waveguides 10A and 10B, the attenuation (loss) of the high-frequency signal generated by being reflected by the first and second inclined surfaces 12A and 12B can be suppressed, which is advantageous for ensuring the quality of the high-frequency signal transmitted through the two connected dielectric waveguides 10A and 10B. In addition, since the first inclined surface 12A and the second inclined surface 12B are aligned in a state where the axis 14A of the portion of the dielectric waveguide 10A where the first inclined surface 12A is formed and the axis 14B of the portion of the dielectric waveguide 10B where the second inclined surface 12B is formed are aligned, it is advantageous for reliably and easily aligning the first inclined surface 12A and the second inclined surface 12B without gaps, and is advantageous for ensuring the quality of the high-frequency signal transmitted through the two connected dielectric waveguides 10A and 10B.

[0015] (Third Embodiment) Next, the third embodiment will be described with reference to FIG. 5. In the third embodiment, the configuration of the holding structure 18C is different from that of the first embodiment, and the holding structure 18C includes a holding member 22. The holding member 22 includes a holding cylinder 24 and an attachment mechanism 26. The holding cylinder 24 has a rectangular frame-shaped cylindrical cross-section with attachment holes 2402 through which the dielectric waveguides 10A and 10B can be inserted and removed and which have substantially the same cross-sectional shape as the dielectric waveguides 10A and 10B. Various conventionally known materials such as metal materials and synthetic resin materials can be adopted for the holding cylinder 24. The attachment mechanism 26 is a mechanism for attaching the dielectric waveguides 10A and 10B inserted into the attachment holes 2402 in a non-movable manner in the axial direction of the attachment holes 2402. The attachment mechanism 26 is provided at two positions on the holding cylinder 24 spaced apart in the axial direction of the attachment holes 2402. The attachment mechanism 26 includes a female screw 2602 that penetrates from the outer peripheral surface of the holding cylinder 24 into the attachment holes 2402 and a bolt 2604 that is screwed into the female screw 2602.

[0016] According to the third embodiment, one end in the longitudinal direction of the dielectric waveguides 10A and 10B is inserted into the attachment holes 2402 from both ends of the attachment holes 2402, the first inclined surface 12A and the second inclined surface 12B are aligned, and the bolt 2604 is operated to press the dielectric waveguides 10A and 10B against the inner surface of the attachment holes 2002 with the tip of the bolt 2604. As a result, in a state where the axis 14A of the portion of the dielectric waveguide 10A where the first inclined surface 12A is formed and the axis 14B of the portion of the dielectric waveguide 10B where the second inclined surface 12B is formed are aligned within the attachment holes 2402, the holding member 22 holds the first inclined surface 12A and the second inclined surface 12B in a combined state. Therefore, similar to the first embodiment, compared with the case where end faces cut along a plane orthogonal to the longitudinal direction of the dielectric waveguides 10A and 10B are joined, the attenuation (loss) of the high-frequency signal generated by being reflected by the first and second inclined surfaces 12A and 12B can be suppressed, which is advantageous in ensuring the quality of the high-frequency signal transmitted through the two connected dielectric waveguides 10A and 10B. Also, with the axis 14A of the portion of the dielectric waveguide 10A where the first inclined surface 12A is formed and the axis 14B of the portion of the dielectric waveguide 10B where the second inclined surface 12B is formed being aligned, and the first inclined surface 12A and the second inclined surface 12B being combined, similar to the second embodiment, it is advantageous in reliably and easily combining the first inclined surface 12A and the second inclined surface 12B without a gap, and is also advantageous in ensuring the quality of the high-frequency signal transmitted through the two connected dielectric waveguides 10A and 10B.

[0017] (Fourth Embodiment) Next, the fourth embodiment will be described with reference to FIG. 6. In the fourth embodiment, the configuration of the holding structure 18D is different from that of the first embodiment. As shown in FIG. 6(A), the holding structure 18D includes a first holding member 30 and a second holding member 32. As shown in FIG. 6(C), the first holding member 30 includes a first holding cylinder 34 and a first attachment mechanism 36. The first holding cylinder 34 has a rectangular frame-shaped cylindrical cross-section with a first attachment hole 3402 formed therethrough, through which the dielectric waveguides 10A and 10B can be inserted and removed and which has substantially the same cross-sectional shape as the dielectric waveguides 10A and 10B. The first attachment mechanism 36 is a mechanism for non-movably attaching the dielectric waveguides 10A and 10B inserted into the first attachment hole 3402 in the axial direction of the first attachment hole 3402. The first attachment mechanism 36 is provided at one end in the axial direction of the first attachment hole 3402. The first attachment mechanism 36 is composed of an internal thread 3602 that penetrates from the outer peripheral surface of the first holding cylinder 34 into the first attachment hole 3402 and a bolt 3604 that is screwed into the internal thread 3602.

[0018] As shown in FIG. 6(B), the second holding member 32 includes a second holding cylinder 38, a second attachment mechanism 40, and a third attachment mechanism 42. A second attachment hole 3802 and a third attachment hole 3804 are provided coaxially in the second holding cylinder 38. Note that various conventionally known materials such as metal materials and synthetic resin materials can be adopted for the first holding cylinder 34 and the second holding cylinder 38. The second attachment hole 3802 is formed with a cross-sectional shape substantially the same as that of the dielectric waveguides 10A and 10B and allows the dielectric waveguides 10A and 10B to be inserted and removed. The second attachment mechanism 40 is a mechanism that attaches the dielectric waveguides 10A and 10B in a non-movable state in the axial direction of the second attachment hole 3802 when the dielectric waveguides 10A and 10B are inserted into the second attachment hole 3802. The second attachment mechanism 40 includes a female screw 4002 penetrating from the outer peripheral surface of the second holding cylinder 38 into the second attachment hole 3802 and a bolt 4004 screwed into the female screw 4002. The third attachment hole 3804 is provided so that the first holding cylinder 34 can be inserted and removed, and the axial center of the second attachment hole 3802 coincides with the axial center of the first attachment hole 3402 when the first holding cylinder 34 is inserted into the third attachment hole 3804. The third attachment mechanism 42 is a mechanism that attaches the first holding cylinder 34 in a non-movable state in the axial direction of the third attachment hole 3804 when the first holding cylinder 34 is inserted into the third attachment hole 3804. The third attachment mechanism 42 includes a female screw 4202 penetrating from the outer peripheral surface of the second holding cylinder 38 into the third attachment hole 3804 and a bolt 4204 screwed into the female screw 4202.

[0019] As shown in FIG. 6(C), one end in the longitudinal direction of one of the two dielectric waveguides 10A and 10B, i.e., the dielectric waveguide 10A, is inserted from one end in the axial direction of the first attachment hole 3402 to the middle portion and is pressed against the inner surface of the first attachment hole 3402 by a bolt 3604 constituting the first attachment mechanism 36, and is attached to the first holding member 30 in a non-movable state in the axial direction of the first attachment hole 3402. Also, as shown in FIG. 6(B), one end in the longitudinal direction of the other dielectric waveguide 10B among the two dielectric waveguides 10A and 10B is inserted into the second mounting hole 3802 and protrudes from the third mounting hole 3804, and is pressed against the inner surface of the second mounting hole 3802 by a bolt 4004 that constitutes the second mounting mechanism 40, and is attached to the second holding member 32 so as not to be movable in the axial direction of the second mounting hole 3802. In the present embodiment, one end in the longitudinal direction of the other dielectric waveguide 10B protrudes from the third mounting hole 3804, in other words, in a state of protruding from the second holding cylinder 38, and is attached to the second holding member 32 so as not to be movable in the axial direction of the second mounting hole 3802.

[0020] Then, as shown in FIG. 6(A), the first holding member 30 is inserted into the third mounting hole 3804, and one end in the longitudinal direction of the other dielectric waveguide 10B is inserted into the first mounting hole 3402 from the other end in the axial direction of the first mounting hole 3402, and the first inclined surface 12A and the second inclined surface 12B are combined, and the first holding member 30 is attached to the second holding member 32 so as not to be movable in the axial direction of the third mounting hole 3804 by a bolt 4204 that constitutes the third mounting mechanism 42. As a result, the axis 14A of the portion of the dielectric waveguide 10A where the first inclined surface 12A is formed in the first mounting hole 3402 and the axis 14B of the portion of the dielectric waveguide 10B where the second inclined surface 12B is formed are aligned, and the first holding member 30 and the second holding member 32 hold the first inclined surface 12A and the second inclined surface 12B in a combined state. Therefore, similar to the first embodiment, compared with the case of joining the end faces cut along the plane orthogonal to the longitudinal direction of the dielectric waveguides 10A and 10B, it is possible to suppress the attenuation (loss) of the high-frequency signal generated by being reflected by the first and second inclined surfaces 12A and 12B, which is advantageous for ensuring the quality of the high-frequency signal transmitted through the two connected dielectric waveguides 10A and 10B. Also, with the axis 14A of the portion of the dielectric waveguide 10A where the first inclined surface 12A is formed and the axis 14B of the portion of the dielectric waveguide 10B where the second inclined surface 12B is formed being aligned, the first inclined surface 12A and the second inclined surface 12B are joined together. Thus, similar to the second embodiment, it is advantageous for reliably and easily joining the first inclined surface 12A and the second inclined surface 12B without any gap, and is also advantageous for ensuring the quality of the high-frequency signal transmitted through the two connected dielectric waveguides 10A and 10B. Also, when one end in the longitudinal direction of the other dielectric waveguide 10B is attached to the second holding member 32 in a state of protruding from the second holding cylinder 38 and being immovable in the axial direction of the second attachment hole 3802, one end in the longitudinal direction of the other dielectric waveguide 10B can be easily inserted into the first attachment hole 3402 from the other end in the axial direction of the first attachment hole 3402. Therefore, it is advantageous for easily and reliably performing the coupling operation between the first holding member 30 and the second holding member 32.

Explanation of Reference Numerals

[0021] 10 Dielectric waveguide 10A One dielectric waveguide 10A 10B The other dielectric waveguide 10B 12A First inclined surface 12B Second inclined surface 14A Axis 14B Axis 16 Dielectric material for joining 16A Bonding layer 18A, 18B, 18C Holding structure 20 Holding member 2002 Attachment hole 22 Holding member 24 Holding cylinder 2402 Attachment hole 26 Attachment mechanism 2602 Female screw 2604 Bolt 30 First holding member 32 Second holding member 34 First holding cylinder 3402 First attachment hole 36 First attachment mechanism 3602 Female Screw 3604 Bolt 38 Second Retaining Cylinder 3802 Second Mounting Hole 3804 Third Mounting Hole 40 Second Mounting Mechanism 4002 Female Screw 4004 Bolt 42 Third Mounting Mechanism 4202 Female Screw 4204 Bolt

Claims

**Claim 1**: A connection structure for two dielectric waveguides having the same dielectric constant, wherein one end in the longitudinal direction of one of the two dielectric waveguides is formed by a first inclined surface that is inclined at a predetermined angle with respect to an orthogonal plane orthogonal to the longitudinal direction, one end in the longitudinal direction of the other of the two dielectric waveguides is formed by a second inclined surface that is inclined at the same angle as the first inclined surface, it has a holding structure for holding the first inclined surface and the second inclined surface together, the first inclined surface and the second inclined surface are joined by a bonding layer having the same dielectric constant as the two dielectric waveguides, the holding structure is constituted by the bonding layer, characterized in that it is a connection structure for a dielectric waveguide. **Claim 2**: A connection structure for two dielectric waveguides, wherein one end in the longitudinal direction of one of the two dielectric waveguides is formed by a first inclined surface that is inclined at a predetermined angle with respect to an orthogonal plane orthogonal to the longitudinal direction, one end in the longitudinal direction of the other of the two dielectric waveguides is formed by a second inclined surface that is inclined at the same angle as the first inclined surface, it has a holding structure for holding the first inclined surface and the second inclined surface together, a holding member having a mounting hole formed therethrough is provided, and the state in which the dielectric waveguide is inserted is held by friction with the dielectric waveguide in a state where the dielectric waveguide is inserted, one end in the longitudinal direction of the two dielectric waveguides is inserted into the mounting hole from both ends of the mounting hole, and the first inclined surface and the second inclined surface are combined, the holding structure is constituted by including the holding member, characterized in that it is a connection structure for a dielectric waveguide. **Claim 3**: A connection structure for two dielectric waveguides, wherein one end in the longitudinal direction of one of the two dielectric waveguides is formed by a first inclined surface that is inclined at a predetermined angle with respect to an orthogonal plane orthogonal to the longitudinal direction, one end in the longitudinal direction of the other of the two dielectric waveguides is formed by a second inclined surface that is inclined at the same angle as the first inclined surface, it has a holding structure for holding the first inclined surface and the second inclined surface together, A holding member is provided, which includes a holding cylinder having an attachment hole through which the dielectric waveguide can be inserted, and an attachment mechanism provided at two positions of the holding cylinder spaced apart in the axial direction of the attachment hole, and for movably attaching the dielectric waveguides inserted into the attachment hole to the attachment hole in the axial direction of the attachment hole, One end in the longitudinal direction of the two dielectric waveguides is inserted into the attachment hole from both ends of the attachment hole, and is attached to the attachment hole by the attachment mechanism in a state where the first inclined surface and the second inclined surface are combined, The holding structure is configured to include the holding member, A connection structure of a dielectric waveguide, characterized by the above.

4. A connection structure of two dielectric waveguides, One end in the longitudinal direction of one of the two dielectric waveguides is formed by a first inclined surface that is inclined at a predetermined angle with respect to an orthogonal plane orthogonal to the longitudinal direction, One end in the longitudinal direction of the other of the two dielectric waveguides is formed by a second inclined surface that is inclined at the same angle as the first inclined surface, It has a holding structure for holding the first inclined surface and the second inclined surface in a combined state, It has a first attachment hole formed through which the dielectric waveguide can be inserted, and a first holding member in which one end in the longitudinal direction of one of the two dielectric waveguides is inserted from one end in the axial direction of the first attachment hole to the middle part and is attached to the first attachment hole in the axial direction of the first attachment hole so as not to move, A second attachment hole into which the dielectric waveguide can be inserted, and a third attachment hole provided coaxially with the second attachment hole and allowing the insertion of the first holding member, and a second holding member in which one end in the longitudinal direction of the other of the two dielectric waveguides is inserted into the second attachment hole and protrudes into the third attachment hole and is attached to the second attachment hole in the axial direction of the second attachment hole so as not to move, The first holding member is inserted into the third attachment hole, and one end in the longitudinal direction of the other of the two dielectric waveguides is inserted into the first attachment hole from the other end in the axial direction of the first attachment hole, and the first holding member is attached to the second holding member in the axial direction of the third attachment hole so as not to move in a state where the first inclined surface and the second inclined surface are combined, The holding structure is configured to include the first holding member and the second holding member, A connection structure of a dielectric waveguide, characterized by the following.

5. The first holding member includes a first holding cylinder in which the first mounting hole is formed therethrough, and a first mounting mechanism for mounting the one dielectric waveguide in a non-movable manner in the axial direction of the first mounting hole with the one dielectric waveguide inserted into the first mounting hole. The second holding member includes a second holding cylinder in which the second mounting hole and the third mounting hole are coaxially formed, a second mounting mechanism for mounting the other dielectric waveguide in a non-movable manner in the axial direction of the second mounting hole with the other dielectric waveguide inserted into the second mounting hole, and a third mounting mechanism for mounting the first holding cylinder in a non-movable manner in the axial direction of the third mounting hole with the first holding cylinder inserted into the third mounting hole. The connection structure of the dielectric waveguide according to claim 4, characterized by the following.

6. A connection structure of two dielectric waveguides, characterized by the following. One end in the longitudinal direction of one of the two dielectric waveguides is formed by a first inclined surface that is inclined at a predetermined angle with respect to an orthogonal plane orthogonal to the longitudinal direction. One end in the longitudinal direction of the other of the two dielectric waveguides is formed by a second inclined surface that is inclined at the same angle as the first inclined surface. It has a holding structure for holding the first inclined surface and the second inclined surface in a combined state. The two dielectric waveguides are configured to include a core portion and a clad portion that covers the periphery of the core portion and has a lower dielectric constant than the core portion. The connection structure of the dielectric waveguide, characterized by the following.

7. The clad portion is composed of an air layer that covers the periphery of the core portion. The connection structure of the dielectric waveguide according to claim 6, characterized by the following.

8. The predetermined angle is 2 degrees or more and less than 15 degrees. The connection structure of the dielectric waveguide according to any one of claims 1 to 7, characterized by the following.

9. The cross-sections of the two dielectric waveguides are the same in shape and size, being rectangular or circular. The connection structure of the dielectric waveguide according to any one of claims 1 to 8, characterized by the following.

10. The axis of the portion of the dielectric waveguide where the first inclined surface is formed coincides with the axis of the portion of the dielectric waveguide where the second inclined surface is formed. The connection structure of the dielectric waveguide according to any one of claims 1 to 9, characterized by the following.

11. A method for connecting two dielectric waveguides, characterized by the following. One end in the longitudinal direction of one of the two dielectric waveguides is formed with a first inclined surface that is inclined at a predetermined angle with respect to an orthogonal plane orthogonal to the longitudinal direction. One end in the longitudinal direction of the other of the two dielectric waveguides is formed with a second inclined surface that is inclined at the same angle as the first inclined surface. The first inclined surface and the second inclined surface are held in a combined state. A method for connecting a dielectric waveguide, characterized by the above.

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