JP7704375B2 - Connection structure and connection method for dielectric waveguides - Google Patents

Description

The present invention relates to a connection structure and a connection method for dielectric waveguides.

2. Description of the Related Art Dielectric waveguides (dielectric lines) are used as one type of structure for transmitting high-frequency signals such as millimeter waves and submillimeter waves.
A dielectric waveguide is made of a dielectric material, and a high-frequency signal propagates through the inside of the dielectric waveguide while being reflected.

JP 2017-147551 A

Incidentally, when it becomes necessary to connect one dielectric waveguide to another, a known method of connecting the two dielectric waveguides involves cutting the longitudinal ends of each dielectric waveguide along a plane perpendicular to the longitudinal direction to form end faces, and then joining the two end faces with the axes of the two dielectric waveguides aligned with each other.
However, with such a connection method, the high-frequency signal is likely to be attenuated (lost) due to reflection at the joined end faces, which is disadvantageous in terms of ensuring the quality of the transmitted high-frequency signal.
The present invention has been made in consideration of the above circumstances, and an object of the present invention is to provide a connection structure and a connection method for dielectric waveguides that are advantageous in ensuring the quality of the transmitted high-frequency signal.

In order to achieve the above-mentioned object, one embodiment of the present invention is 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 inclined at a predetermined angle with respect to an orthogonal plane perpendicular 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 inclined at the same angle as the first inclined surface, and the connection structure has a holding structure that holds the first inclined surface and the second inclined surface in an aligned state.
Moreover, one embodiment of the present invention is a method for connecting two dielectric waveguides, comprising forming one longitudinal end of one of the two dielectric waveguides with a first inclined surface inclined at a predetermined angle with respect to an orthogonal plane perpendicular to the longitudinal direction, forming one longitudinal end of the other of the two dielectric waveguides with a second inclined surface inclined at the same angle as the first inclined surface, and maintaining the first inclined surface and the second inclined surface in an aligned state.

According to one embodiment of the present invention, the two dielectric waveguides are held in a state where the first and second inclined surfaces, which are inclined at a predetermined angle with respect to the orthogonal plane perpendicular to their longitudinal direction, are aligned. This makes it possible to suppress the attenuation (loss) of the high-frequency signal caused by reflection at the first and second inclined surfaces compared to conventional technology, and is advantageous in suppressing the attenuation of the high-frequency signal transmitted through the two connected dielectric waveguides and ensuring the quality of the high-frequency signal.

1A and 1B are explanatory diagrams of a connection structure and a connection method of a dielectric waveguide according to a first embodiment, in which (A) shows a state before the formation of a first inclined surface and a second inclined surface, (B) shows a state after the formation of the first inclined surface and the second inclined surface, and (C) shows a state in which the first inclined surface and the second inclined surface are joined. FIG. 2 is a perspective view of a dielectric waveguide corresponding to FIG. FIG. 13 is a perspective view of a dielectric waveguide in a modified example. 10A and 10B are explanatory diagrams of a connection structure and a connection method of a dielectric waveguide according to a second embodiment, in which (A) is a sectional front view and (B) is a BB sectional view of (A). 13A and 13B are explanatory diagrams of a connection structure and a connection method of a dielectric waveguide according to a third embodiment, in which (A) is a sectional front view and (B) is a BB sectional view of (A). 13A and 13B are explanatory diagrams of a connection structure and a connection method of a dielectric waveguide according to a fourth embodiment, in which (A) is a sectional front view, (B) is a sectional view of a second holding member, and (C) is a sectional view of a first holding member.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a connecting structure for dielectric waveguides according to the present invention will be described together with a joining method with reference to the drawings.
First, the dielectric waveguide will be described.
A dielectric waveguide is a structure used to transmit high-frequency signals (radio waves) having a wavelength λ of about 0.1 mm to 1 mm and a frequency f of about 300 GHz to 3000 GHz, which are called submillimeter waves. Such submillimeter waves have attracted attention as high-frequency signals to be used in 5G (fifth generation mobile communication system) and 6G (sixth generation mobile communication system), which is the next generation of 5G.
The dielectric waveguide is formed in an elongated shape with a uniform rectangular or circular cross-sectional shape, and a high-frequency signal propagates inside the dielectric waveguide along its longitudinal direction while being reflected.
The dielectric material constituting the dielectric waveguide is made of a conventionally known synthetic resin material such as fluororesin or polyethylene.
The dielectric waveguide is composed of a core portion and a cladding portion that surrounds the core portion and has a lower dielectric constant than the core portion. In this embodiment, we will explain the case where the cladding portion is composed of an air layer that surrounds the core portion.
That is, the dielectric waveguide is composed of a core portion and an air layer surrounding the core portion, and in the following description, the dielectric waveguide refers to the core portion that constitutes the dielectric waveguide.
Of course, the present invention is also applicable to a dielectric waveguide in which the clad portion is made of a dielectric material having a lower dielectric constant than the core portion.

(First embodiment)
Next, a connection structure and a connection method for a dielectric waveguide (a connection structure and a connection method for a core portion constituting a dielectric waveguide) will be described.
As shown in Fig. 1A, 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, and therefore the cross-sectional shapes and dielectric constants of the two dielectric waveguides 10A and 10B are the same. In this embodiment, a case will be described in which the dielectric waveguides 10A and 10B have rectangular (rectangular) cross-sectional shapes of the same shape and size.
As shown in FIGS. 1A and 2, each of the dielectric waveguides 10A and 10B has a width W and a thickness T that is smaller than the width W.
Next, as shown in FIGS. 1(B) and 2, one longitudinal end of one of the two dielectric waveguides 10A, 10B is formed by a first inclined surface 12A inclined at a predetermined angle θ with respect to an orthogonal plane P perpendicular to the longitudinal direction, and one longitudinal end of the other of the two dielectric waveguides 10A, 10B is formed by a second inclined surface 12B inclined at the same angle θ as the first inclined surface 12A.
In this example, a case will be described in which 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.
The inclined surfaces 12A, 12B are formed by cutting the dielectric waveguides 10A, 10B using a dedicated cutting machine.
Setting the specified angle θ within the range of 2 degrees or more and less than 15 degrees in view of the relationship between the refractive index of the dielectric waveguides 10A, 10B and the refractive index of air is advantageous in suppressing attenuation (loss) of high-frequency signals caused by reflection at the first and second inclined surfaces 12A, 12B in the connected dielectric waveguides 10A, 10B and in ensuring the quality of high-frequency signals transmitted through the two connected dielectric waveguides 10A, 10B.
If the specified angle θ is below or above the above range, the attenuation (loss) of the high-frequency signal caused by reflection at the first and second inclined surfaces 12A, 12B in the connected dielectric waveguides 10A, 10B increases, and the effect of ensuring the quality of the high-frequency signal transmitted through the two connected dielectric waveguides 10A, 10B decreases.

Next, as shown in FIG. 1C, the first inclined surface 12A and the second inclined surface 12B are held in an aligned state.
Specifically, as shown in FIG. 1B , the first inclined surface 12A and the second inclined surface 12B are held in a mated state by butting the first inclined surface 12A and the second inclined surface 12B together with a bonding dielectric material 16 interposed between the first inclined surface 12A and the second inclined surface 12B. The bonding dielectric material 16 has the same dielectric constant as the dielectric waveguides 10A and 10B and a lower melting point than the dielectric waveguides 10A and 10B.
In this state, the periphery of the first inclined surface 12A and the second inclined surface 12B is heated with a heater to melt the bonding dielectric material 16, and then the bonding dielectric material 16 is cooled and solidified to bond the first inclined surface 12A and the second inclined surface 12B.
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, and therefore in this embodiment, a holding structure 18A that holds the first inclined surface 12A and the second inclined surface 12B in a joined state is formed by the joining layer 16A.
As a result, as shown in FIG. 1(C), the two dielectric waveguides 10A, 10B are joined together with the first inclined surface 12A and the second inclined surface 12B overlapping each other without any gaps, thereby forming one dielectric waveguide 10 in which the two dielectric waveguides 10A, 10B are connected.

As described above, according to this embodiment, the first inclined surface 12A and the second inclined surface 12B are held together, so that the attenuation (loss) of the high-frequency signal caused by reflection at the first and second inclined surfaces 12A and 12B can be suppressed compared to joining end faces cut along a plane perpendicular to the longitudinal direction of the dielectric waveguides 10A and 10B, which is advantageous in ensuring the quality of the high-frequency signal transmitted through the two connected dielectric waveguides 10A and 10B.

Next, a modified example shown in FIG. 3 will be described.
In the above-described embodiment, the first and second inclined surfaces 12A, 12B are inclined in a direction intersecting the width W direction of the dielectric waveguides 10A, 10B. However, in the modified example, the first and second inclined surfaces 12A, 12B are inclined in a direction intersecting the thickness T direction of the dielectric waveguides 10A, 10B.
In this modified example as well, two dielectric waveguides 10A, 10B are joined together to form one dielectric waveguide 10, as in the above-described embodiment, and the same effects as in the embodiment are achieved.

Second Embodiment
Next, a second embodiment will be described with reference to FIG.
In the following embodiments, the same reference numerals are used for parts and components similar to those in the first embodiment, and their description is omitted or simplified, and the following description focuses on the points that are different from the first embodiment.
In the second embodiment, the configuration of a holding structure 18B is different from that in the first embodiment, and the holding structure 18B is configured to include a holding member 20.
The holding member 20 has a cylindrical shape with a rectangular frame-like cross section, through which a mounting hole 2002 is formed.
The holding member 20 can be made of various conventionally known materials such as metal materials and synthetic resin materials.
The mounting holes 2002 have substantially the same cross-sectional shape as the dielectric waveguides 10A, 10B, and are formed so that the dielectric waveguides 10A, 10B can be inserted and removed, and that when the dielectric waveguides 10A, 10B are inserted, the inserted state of the dielectric waveguides 10A, 10B is maintained by friction with the dielectric waveguides 10A, 10B.
It is optional to attach a material having a large coefficient of friction with respect to the dielectric waveguides 10A and 10B to the inner circumferential surface of the mounting hole 2002.

According to the second embodiment, one end of each of the dielectric waveguides 10A and 10B in the longitudinal direction is inserted into the mounting hole 2002 from both ends of the mounting hole 2002, and the first inclined surface 12A and the second inclined surface 12B are aligned.
As a result, 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, and the first inclined surface 12A and the second inclined surface 12B are held in an aligned state.
Therefore, similarly to the first embodiment, compared to the case where end faces cut along a plane perpendicular to the longitudinal direction of the dielectric waveguides 10A, 10B are joined together, it is possible to suppress attenuation (loss) of high-frequency signals caused by reflection at the first and second inclined surfaces 12A, 12B, which is advantageous in ensuring the quality of high-frequency signals transmitted through the two connected dielectric waveguides 10A, 10B.
Furthermore, the first inclined surface 12A and the second inclined surface 12B are aligned with each other while 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 with each other. This is advantageous in that the first inclined surface 12A and the second inclined surface 12B can be aligned reliably and easily without any gaps, and is advantageous in ensuring the quality of high-frequency signals transmitted through the two connected dielectric waveguides 10A, 10B.

Third Embodiment
Next, a third embodiment will be described with reference to FIG.
In the third embodiment, the configuration of a holding structure 18C is different from that in the first embodiment, and the holding structure 18C is configured to include a holding member 22.
The holding member 22 includes a holding tube 24 and an attachment mechanism 26 .
The retaining cylinder 24 has a cylindrical shape with a rectangular frame-like cross section, through which a mounting hole 2402 having substantially the same cross-sectional shape as the dielectric waveguides 10A and 10B is formed and into which the dielectric waveguides 10A and 10B can be inserted and removed.
The retaining cylinder 24 can be made of various conventionally known materials such as metal materials and synthetic resin materials.
The mounting mechanism 26 is a mechanism for mounting the dielectric waveguides 10A and 10B inserted into the mounting holes 2402 so as to be immovable in the axial direction of the mounting holes 2402.
The mounting mechanisms 26 are provided at two locations on the retaining cylinder 24 spaced apart in the axial direction of the mounting hole 2402 .
The mounting mechanism 26 is composed of a female thread 2602 that passes through the outer circumferential surface of the retaining tube 24 into the mounting hole 2402 , and a bolt 2604 that screws into this female thread 2602 .

According to the third embodiment, one end of the dielectric waveguides 10A and 10B in the longitudinal direction is inserted into the mounting hole 2402 from both ends of the mounting hole 2402, respectively, so that the first inclined surface 12A and the second inclined surface 12B are aligned with each other, and the bolts 2604 are operated to press the dielectric waveguides 10A and 10B against the inner surface of the mounting hole 2002 with the tips of the bolts 2604.
As a result, within the mounting hole 2402, 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, and the first inclined surface 12A and the second inclined surface 12B are held in an aligned state by the holding member 22.
Therefore, similarly to the first embodiment, compared to the case where end faces cut along a plane perpendicular to the longitudinal direction of the dielectric waveguides 10A, 10B are joined together, it is possible to suppress attenuation (loss) of high-frequency signals caused by reflection at the first and second inclined surfaces 12A, 12B, which is advantageous in ensuring the quality of high-frequency signals transmitted through the two connected dielectric waveguides 10A, 10B.
Furthermore, the first inclined surface 12A and the second inclined surface 12B are aligned with each other while 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 with each other. This is advantageous in that the first inclined surface 12A and the second inclined surface 12B can be aligned reliably and easily without any gaps, as in the second embodiment, and is advantageous in ensuring the quality of high-frequency signals transmitted through the two connected dielectric waveguides 10A, 10B.

(Fourth embodiment)
Next, a fourth embodiment will be described with reference to FIG.
The fourth embodiment differs from the first embodiment in the configuration of a holding structure 18D, and as shown in FIG. 6(A), the holding structure 18D is configured to include a first holding member 30 and a second holding member 32.
As shown in FIG. 6C , the first holding member 30 includes a first holding cylinder 34 and a first attachment mechanism 36 .
The first holding cylinder 34 has a cylindrical shape with a rectangular frame-like cross section, through which a first mounting hole 3402 having substantially the same cross-sectional shape as the dielectric waveguides 10A, 10B is formed and into which the dielectric waveguides 10A, 10B can be inserted and removed.
The first mounting mechanism 36 is a mechanism for mounting the dielectric waveguides 10A and 10B inserted into the first mounting holes 3402 so as to be immovable in the axial direction of the first mounting holes 3402 .
The first mounting mechanism 36 is provided at one end of the first mounting hole 3402 in the axial direction.
The first mounting mechanism 36 is composed of a female thread 3602 that penetrates from the outer circumferential surface of the first holding cylinder 34 to the first mounting hole 3402 , and a bolt 3604 that screws into this female thread 3602 .

As shown in FIG. 6(B), the second retaining member 32 includes a second retaining tube 38, a second mounting mechanism 40, and a third mounting mechanism 42. The second retaining tube 38 is provided with a second mounting hole 3802 and a third mounting hole 3804 that are coaxially arranged.
The first retaining cylinder 34 and the second retaining cylinder 38 may be made of various conventionally known materials such as metal materials and synthetic resin materials.
The second mounting holes 3802 are formed to have substantially the same cross-sectional shape as the dielectric waveguides 10A and 10B and allow the dielectric waveguides 10A and 10B to be inserted and removed therefrom.
The second mounting mechanism 40 is a mechanism for mounting the dielectric waveguides 10A, 10B so as to be immovable in the axial direction of the second mounting hole 3802 when the dielectric waveguides 10A, 10B are inserted into the second mounting hole 3802 .
The second mounting mechanism 40 is composed of a female thread 4002 that penetrates from the outer circumferential surface of the second retaining cylinder 38 into the second mounting hole 3802 , and a bolt 4004 that screws into this female thread 4002 .
The third mounting hole 3804 is provided so that the first retaining tube 34 can be inserted and removed, and is provided so that when the first retaining tube 34 is inserted into the third mounting hole 3804, the axis of the second mounting hole 3802 coincides with the axis of the first mounting hole 3402.
The third attachment mechanism 42 is a mechanism for attaching the first holding tube 34 so as to be immovable in the axial direction of the third attachment hole 3804 when the first holding tube 34 is inserted into the third attachment hole 3804 .
The third attachment mechanism 42 is composed of a female thread 4202 that penetrates from the outer circumferential surface of the second holding cylinder 38 to the third attachment hole 3804 , and a bolt 4204 that screws into this female thread 4202 .

As shown in FIG. 6(C) , one longitudinal end of one of the two dielectric waveguides 10A, 10B is inserted from one axial end to the middle portion of the first mounting hole 3402, and is pressed against the inner surface of the first mounting hole 3402 by a bolt 3604 constituting the first mounting mechanism 36, and is attached to the first holding member 30 so as not to be movable in the axial direction of the first mounting hole 3402.
As shown in FIG. 6(B) , one longitudinal end of the other of the two dielectric waveguides 10A, 10B is inserted into the second mounting hole 3802 and protrudes into the third mounting hole 3804. The other longitudinal end of the dielectric waveguide 10B is pressed against the inner surface of the second mounting hole 3802 by a bolt 4004 constituting 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 this embodiment, one end of the other dielectric waveguide 10B in the longitudinal direction is attached to the second retaining member 32 so as to be immovable in the axial direction of the second mounting hole 3802, with the end protruding from the third mounting hole 3804, in other words, with the end protruding from the second retaining tube 38.

Then, as shown in FIG. 6A , the first retaining member 30 is inserted into the third mounting hole 3804, and one longitudinal end of the other dielectric waveguide 10B is inserted into the first mounting hole 3402 from the other axial end of the first mounting hole 3402 so that the first inclined surface 12A and the second inclined surface 12B are aligned. In this state, the first retaining member 30 is attached to the second retaining member 32 by the bolt 4204 that constitutes the third mounting mechanism 42 so as to be immovable in the axial direction of the third mounting hole 3804.
As a result, in the first mounting hole 3402, 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, 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 an aligned state.
Therefore, similarly to the first embodiment, compared to the case where end faces cut along a plane perpendicular to the longitudinal direction of the dielectric waveguides 10A, 10B are joined together, it is possible to suppress attenuation (loss) of high-frequency signals caused by reflection at the first and second inclined surfaces 12A, 12B, which is advantageous in ensuring the quality of high-frequency signals transmitted through the two connected dielectric waveguides 10A, 10B.
Furthermore, the first inclined surface 12A and the second inclined surface 12B are aligned with each other while 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 with each other. This is advantageous in that the first inclined surface 12A and the second inclined surface 12B can be aligned reliably and easily without any gaps, as in the second embodiment, and is advantageous in ensuring the quality of high-frequency signals transmitted through the two connected dielectric waveguides 10A, 10B.
Furthermore, when the other dielectric waveguide 10B is attached to the second holding member 32 so as to be immovable in the axial direction of the second mounting hole 3802 with one end of the other dielectric waveguide 10B protruding from the second holding tube 38, it becomes easier to insert the one end of the other dielectric waveguide 10B in the axial direction into the first mounting hole 3402 from the other end of the first mounting hole 3402, which is advantageous in terms of easily and reliably connecting the first holding member 30 and the second holding member 32.

10 Dielectric waveguide 10A One of the dielectric waveguides 10A
10B The other dielectric waveguide 10B
12A First inclined surface 12B Second inclined surface 14A Axis 14B Axis 16 Bonding dielectric material 16A Bonding layers 18A, 18B, 18C Holding structure 20 Holding member 2002 Mounting hole 22 Holding member 24 Holding tube 2402 Mounting hole 26 Mounting mechanism 2602 Female thread 2604 Bolt 30 First holding member 32 Second holding member 34 First holding tube 3402 First mounting hole 36 First mounting mechanism 3602 Female thread 3604 Bolt 38 Second holding tube 3802 Second mounting hole 3804 Third mounting hole 40 Second mounting mechanism 4002 Female thread 4004 Bolt 42 Third mounting mechanism 4202 Female thread 4204 Bolt

Claims (11)

A connection structure of two dielectric waveguides having the same dielectric constant ,
one end in a longitudinal direction of one of the two dielectric waveguides is formed by a first inclined surface inclined at a predetermined angle with respect to an orthogonal plane orthogonal to the longitudinal direction,
one end in a longitudinal direction of the other of the two dielectric waveguides is formed by a second inclined surface inclined at the same angle as the first inclined surface,
a holding structure that holds the first inclined surface and the second inclined surface in an aligned state ,
the first inclined surface and the second inclined surface are joined by a joining layer having the same dielectric constant as the two dielectric waveguides;
The holding structure is composed of the bonding layer.
A connection structure for dielectric waveguides comprising: A connection structure for two dielectric waveguides, comprising:
one end in a longitudinal direction of one of the two dielectric waveguides is formed by a first inclined surface inclined at a predetermined angle with respect to an orthogonal plane orthogonal to the longitudinal direction,
one end in a longitudinal direction of the other of the two dielectric waveguides is formed by a second inclined surface inclined at the same angle as the first inclined surface,
a holding structure that holds the first inclined surface and the second inclined surface in an aligned state,
a holding member is provided, the holding member having an attachment hole formed therethrough, through which the dielectric waveguide is held in an inserted state by friction with the dielectric waveguide;
one end of each of the two dielectric waveguides in the longitudinal direction is inserted into the mounting hole from both ends of the mounting hole, and the first inclined surface and the second inclined surface are aligned with each other;
The holding structure is configured to include the holding member.
A connection structure for dielectric waveguides comprising: A connection structure for two dielectric waveguides, comprising:
one end in a longitudinal direction of one of the two dielectric waveguides is formed by a first inclined surface inclined at a predetermined angle with respect to an orthogonal plane orthogonal to the longitudinal direction,
one end in a longitudinal direction of the other of the two dielectric waveguides is formed by a second inclined surface inclined at the same angle as the first inclined surface,
a holding structure that holds the first inclined surface and the second inclined surface in an aligned state,
a holding member including a holding cylinder having an attachment hole formed therethrough and into which the dielectric waveguide can be inserted, and attachment mechanisms provided at two locations on the holding cylinder spaced apart in an axial direction of the attachment hole, and which attach the dielectric waveguide inserted into each of the attachment holes so as not to move in the axial direction of the attachment hole,
one end of each of the two dielectric waveguides in the longitudinal direction is inserted into the mounting hole from both ends of the mounting hole, and is attached to the mounting hole by the mounting mechanism in a state in which the first inclined surface and the second inclined surface are aligned,
The holding structure is configured to include the holding member.
A connection structure for dielectric waveguides comprising: A connection structure for two dielectric waveguides, comprising:
one end in a longitudinal direction of one of the two dielectric waveguides is formed by a first inclined surface inclined at a predetermined angle with respect to an orthogonal plane orthogonal to the longitudinal direction,
one end in a longitudinal direction of the other of the two dielectric waveguides is formed by a second inclined surface inclined at the same angle as the first inclined surface,
a holding structure that holds the first inclined surface and the second inclined surface in an aligned state,
a first holding member having a first mounting hole formed therethrough so that the dielectric waveguide can be inserted therethrough, the first holding member being attached so as to be immovable in an axial direction of the first mounting hole in a state in which one end of one of the two dielectric waveguides in a longitudinal direction is inserted from one end of the first mounting hole to a middle portion thereof ;
a second mounting hole into which the dielectric waveguide can be inserted, and a third mounting hole that is coaxial with the second mounting hole and into which the first holding member can be inserted, and a second holding member that is attached so as to be immovable in an axial direction of the second mounting hole with one end of the other of the two dielectric waveguides inserted into the second mounting hole and protruding into the third mounting hole,
the first holding member is inserted into the third mounting hole, and one end in a longitudinal direction of the other of the two dielectric waveguides is inserted into the first mounting hole from the other end in an axial direction of the first mounting hole, and the first holding member is attached to the second holding member in a state in which the first inclined surface and the second inclined surface are aligned with each other, so that the first holding member is immovable in an axial direction of the third mounting hole;
The holding structure includes the first holding member and the second holding member.
A connection structure for dielectric waveguides comprising: the first holding member includes a first holding cylinder having the first mounting hole formed therethrough, and a first mounting mechanism that mounts the one dielectric waveguide in an axial direction of the first mounting hole so as to be immovable in a state in which the one dielectric waveguide is 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 formed coaxially, a second mounting mechanism that mounts the other dielectric waveguide in an axial direction of the second mounting hole while the other dielectric waveguide is inserted into the second mounting hole, and a third mounting mechanism that mounts the first holding cylinder in an axial direction of the third mounting hole while the first holding cylinder is inserted into the third mounting hole, so as to be immovable.
5. The dielectric waveguide connection structure according to claim 4 . A connection structure for two dielectric waveguides, comprising:
one end in a longitudinal direction of one of the two dielectric waveguides is formed by a first inclined surface inclined at a predetermined angle with respect to an orthogonal plane orthogonal to the longitudinal direction,
one end in a longitudinal direction of the other of the two dielectric waveguides is formed by a second inclined surface inclined at the same angle as the first inclined surface,
a holding structure that holds the first inclined surface and the second inclined surface in an aligned state,
The two dielectric waveguides each include a core portion and a clad portion that surrounds the core portion and has a lower dielectric constant than the core portion.
A connection structure for dielectric waveguides comprising: The clad portion is composed of an air layer surrounding the core portion.
7. The dielectric waveguide connection structure according to claim 6 . The predetermined angle is equal to or greater than 2 degrees and less than 15 degrees.
The connection structure of dielectric waveguides according to any one of claims 1 to 7 . The cross sections of the two dielectric waveguides are rectangular or circular and have the same shape and size.
The connection structure of dielectric waveguides according to any one of claims 1 to 8 . an axis of a portion of the dielectric waveguide where the first inclined surface is formed coincides with an axis of a portion of the dielectric waveguide where the second inclined surface is formed;
The connection structure of dielectric waveguides according to any one of claims 1 to 9 . A method for connecting two dielectric waveguides, comprising the steps of:
one end in a longitudinal direction of one of the two dielectric waveguides is formed with a first inclined surface inclined at a predetermined angle with respect to an orthogonal plane perpendicular to the longitudinal direction;
one end in a longitudinal direction of the other of the two dielectric waveguides is formed with a second inclined surface inclined at the same angle as the first inclined surface;
The first inclined surface and the second inclined surface are held in an aligned state.
2. A method for connecting dielectric waveguides comprising the steps of:

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