Waveguide device

Abstract

A waveguide device (100) is provided with: a first member (10) having a conductive surface (11); a second member (20) having a conductive surface (21) facing the surface (11); a waveguide member (40) which is provided between the surface (11) and the surface (21) so as to extend in the plane direction of the surface (11), is in contact with the surface (11), forms a gap (42) between the surface (21) and the waveguide member (40), and has a conductive waveguide surface (41) facing the surface (21); a plurality of bars (30) which are provided around the waveguide member (40) between the surface (11) and the surface (21), which extend toward the surface (21) while being in contact with the surface (11), form a gap (31) between the bars (30) and the surface (21), and have a conductive surface; and a wall section (50) which is provided between the surface (11) and the surface (21), is in contact with or high-frequency coupling with the surface (11) and the surface (21), is provided adjacent to the waveguide member (40) without interposing the plurality of rods (30), and has conductivity at least on a side surface (51) facing the waveguide member (40).

Description

Technical Field

[0001] The present invention relates to waveguide devices. Background Art

[0002] There are known waveguide devices that use conductive rod arrays to propagate high-frequency electromagnetic waves including millimeter wave bands with low leakage losses (for example, patent documents 1 to 4). Such a waveguide device typically includes two plate-shaped components with conductive surfaces. For example, on the surface of a first component as a component, a conductive rod array that can suppress the leakage of the propagated electromagnetic waves is arranged. In addition, a waveguide component (ridge) extending along the surface of the first component is provided between the conductive rod arrays. And, a second component as another component covers the conductive rod array and the waveguide component provided on the surface of the first component in a shape opposite to them. Electromagnetic waves propagate along the waveguide component. In addition, there is known a structure in which a peripheral wall portion for positioning and fixing the first component and the second component is provided around the first component and the second component and outside the waveguide area (for example, outside the conductive rod array) (for example, patent document 1).

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: U.S. Patent No. 8803638

[0006] Patent Document 2: European Patent Application Publication No. 1331688

[0007] Patent Document 3: International Publication No. 2017 / 078183

[0008] Patent Document 4: International Publication No. 2018 / 190343 Summary of the invention

[0009] Technical problem to be solved by the invention

[0010] In Patent Document 1, the positioning of the first component and the second component in the relative direction of the first component and the second component constituting the waveguide device is performed by using a peripheral wall portion located around the first component and the second component and outside the waveguide area. Therefore, for example, in the case where the first component and / or the second component is warped, there is a case where the interval between the first component and the second component becomes wider or narrower at a portion such as the central portion. Electromagnetic waves propagate in the gap on the waveguide component, so it is desired to make the height of the gap on the waveguide component accurate, but in Patent Document 1, there is a case where the interval between the first component and the second component changes at a portion such as the central portion, so there is a case where the height of the gap on the waveguide component is different from the required size.

[0011] The present invention has been made in view of the above-mentioned technical problems, and an object of the present invention is to provide a waveguide device capable of making the height of a gap on a waveguide component a desired size.

[0012] Means for solving technical problems

[0013] The present invention is a waveguide device, comprising: a first component having a conductive first surface; a second component having a conductive second surface opposite to the first surface; a waveguide component, which is arranged between the first surface and the second surface to extend in the surface direction of the first surface, is in contact with the first surface and forms a first gap between the second surface, and has a conductive waveguide surface opposite to the second surface; a plurality of rods, which are arranged around the waveguide component between the first surface and the second surface, are in contact with one of the first surface and the second surface and extend toward the other surface, form a second gap between the other surface, and have a conductive surface; and a wall portion, which is between the first surface and the second surface, is in contact with the first surface and the second surface or is high-frequency coupled and is arranged adjacent to the waveguide component without being separated by the plurality of rods, and at least the side opposite to the waveguide component has conductivity.

[0014] In the above configuration, a length of the wall portion along the waveguide component in the plane direction may be larger than a distance between the first surface and the second surface at a position of the wall portion.

[0015] In the above configuration, the plurality of rods may be configured such that they are in contact with the first surface and extend toward the second surface, and the second gaps are formed between the plurality of rods and the second surface.

[0016] In the above structure, the side surface of the wall portion may extend along the waveguide component.

[0017] In the above structure, the side surface of the wall portion may be adjacent to the straight line portion of the waveguide component.

[0018] In the above structure, the waveguide component may include a curved portion where the extending direction of the waveguide component changes, and the side surface of the wall portion, including a part of the curved portion, is adjacent to the waveguide component.

[0019] In the above structure, a part of the plurality of rods may be provided on both sides of the wall portion in a direction in which the waveguide component extends.

[0020] In the above configuration, a part of the plurality of rods may be provided adjacent to the waveguide member on the opposite side of the wall portion across the waveguide member.

[0021] In the above structure, it may be configured to include a fixing member for fixing the second member to the wall portion.

[0022] In the above configuration, the wall portion may have a through hole or a recessed portion on an upper surface thereof, and the second member may be fixed to the wall portion by inserting the fixing member into the through hole or the recessed portion.

[0023] In the above structure, the wall portion can be constructed so that the wall portion has a groove on the upper surface which is located between the through hole or recess and the waveguide component and along the extension direction of the waveguide component, and when the free space wavelength of the center frequency of the used frequency band is λ0, the depth of the groove is in the range of λ0 / 4±λ0 / 8.

[0024] In the above structure, the groove may be provided so as to surround the through hole or the recessed portion.

[0025] In the above configuration, when a free space wavelength of a center frequency of a used frequency band is λ0, a length of the wall portion along the waveguide member in the plane direction may be greater than λ0 / 2.

[0026] In the above configuration, the wall portion may define a distance between the first member and the second member.

[0027] In the above configuration, a dielectric film may be provided between at least one of the first surface and the second surface and the wall portion.

[0028] Effects of the Invention

[0029] According to the present invention, the height of the gap on the waveguide component can be set to a desired size. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 (a) is a stereoscopic view of the waveguide device of Example 1, Figure 1 (b) is Figure 1 AA cross-section view of (a).

[0031] Figure 2 This is a perspective view of the second component in the waveguide device of Example 1.

[0032] Figure 3 (a) is a cross-sectional view of a waveguide device of a comparative example, Figure 3 (b) is a perspective view showing the second component in the waveguide device of the comparative example.

[0033] Figure 4 (a) is the result of simulation 1 of the comparative example, Figure 4 (b) is the result of simulation 1 of Example 1.

[0034] Figure 5 (a) is a cross-sectional view of the waveguide device used in simulation 2, Figure 5 (b) is the result of simulation 2.

[0035] Figure 6 (a) is a cross-sectional view of the waveguide device used in simulation 3, Figure 6 (b) is the result of simulation 3.

[0036] Figure 7 (a) and Figure 7 (b) is a cross-sectional view of the waveguide device of Modifications 1 and 2 of Example 1, Figure 7 (c) is a stereoscopic view of the rod in the third modification of the first embodiment.

[0037] Figure 8 (a) to Figure 8 (d) is a cross-sectional view of the waveguide device of variant example 4 to variant example 7 of embodiment 1.

[0038] Fig. 9 (a) is a cross-sectional view of the waveguide device of Example 2, Fig. 9 (b) is a stereoscopic view of the waveguide device of Example 2, in which the second component and the fixing component are seen through.

[0039] Fig.10 This is a cross-sectional view when a recessed portion is provided in the wall portion.

[0040] Fig.11 (a) and Fig.11 (b) is a cross-sectional view of the case where a gap or a dielectric film is provided between the wall portion and the second member in Example 2, Fig.11 (c) and Fig.11 (d) is a cross-sectional view in the case where a gap or a dielectric film is provided between the wall portion and the first member.

[0041] Fig.12 (a) and Fig.12 (b) is a three-dimensional view showing the vicinity of the wall portion in Modifications 1 and 2 of Example 2. Fig.12 (c) is Fig.12 (a) Fig.12 (b) Cross-sectional view of the wall at AA.

[0042] Fig.13 (a) is a cross-sectional view of the waveguide device of Example 3, Fig.13 (b) is a stereoscopic view obtained by seeing through the second component in the waveguide device of Example 3.

[0043] Fig.14 (a) is a cross-sectional view of the waveguide device of Example 4, Fig.14 (b) is a stereoscopic view obtained by seeing through the second component in the waveguide device of Example 4.

[0044] Fig.15 (a) is a perspective view of the second component in the waveguide device of the modification example 1 of the embodiment 4, Fig.15 (b) is a cross-sectional view of the waveguide device of variant example 1 of embodiment 4.

[0045] Fig.16 (a) is a perspective view of the second component in the waveguide device of the second variation of the fourth embodiment. Fig.16 (b) is a cross-sectional view of the waveguide device of variant example 2 of embodiment 4.

[0046] Fig.17 This is a stereoscopic view of the waveguide device of Example 5, in which the second component and the fixing component are seen through.

[0047] Fig.18 This is a stereoscopic view of the waveguide device of Example 6 in which the second component and the fixing component are seen through.

[0048] Fig.19 (a) to Fig.19 (c) is a plan view obtained by looking through the second component and the fixing component in the waveguide device of Modification 1 to Modification 3 of Example 6.

[0049] Fig. 20 (a) and Fig. 20 (b) is a diagram showing a case where a gap is provided between the wall portion and the second component in Example 6 and its modified example. Fig. 20 (c) and Fig. 20 (d) is a diagram in which a dielectric film is provided between the wall portion and the second member.

[0050] Fig.21 This is a plan view obtained by seeing through the second component and the fixing component in the waveguide device of Example 7.

[0051] Fig. 22 (a) and Fig. 22 (b) is a plan view obtained by looking through the second component and the fixing component in the waveguide device of Example 8 and the modified example of Example 8.

[0052] Fig.23 is a cross-sectional view showing another example of the rod. DETAILED DESCRIPTION

[0053] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

[0054] Example 1

[0055] Figure 1 (a) is a perspective view of the waveguide device 100 of Example 1, Figure 1 (b) is Figure 1 AA cross-section view of (a). Figure 2 1 is a perspective view of the second member 20 in the waveguide device 100 of Example 1. Figure 1 (a) Figure 1 (b) and Figure 2 , XYZ coordinates representing mutually orthogonal X, Y, and Z directions are shown. The Z direction is a direction perpendicular to the surface 11, which is a surface of the first member 10 opposite to the second member 20. The X direction is a direction parallel to one direction in which the plurality of rods 30 are arranged, and the Y direction is a direction parallel to another direction in which the plurality of rods 30 are arranged.

[0056] like Figure 1 (a) Figure 1 (b) and Figure 2 As shown, the waveguide device 100 of Example 1 includes a plate-like first component 10 and a second component 20, each extending along the XY plane, facing each other in the Z direction, and arranged approximately parallel to each other. The first component 10 has a conductive surface 11 (hereinafter referred to as the conductive surface 11) opposite to the second component 20. The second component 20 has a conductive surface 21 (hereinafter referred to as the conductive surface 21) opposite to the first component 10. The first component 10 and the second component 20 can be conductive components such as metal components, or can be conductive films such as metal films provided on the surface of insulating components such as resin. The waveguide device 100 also includes: a waveguide component 40 having, for example, a ridge shape, arranged on the conductive surface 11 of the first component 10; and a plurality of rods 30 arranged on both sides of the waveguide component 40. Hereinafter, an electromagnetic wave guide using a conductor component having a plurality of rods 30 arranged therein is sometimes referred to as a WRG (Waffle iron Ridge Waveguide).

[0057] The waveguide component 40 is formed integrally with the first component 10 as a part of the first component 10, and extends in the plane direction of the conductive surface 11 of the first component 10. In this specification, "integrated" includes the case where two components with conductive surfaces are continuously formed of the same material, for example, the case where they are formed by integral molding of metal. Alternatively, it also includes the case where two components with conductive surfaces have a structure that maintains a contact state and are fixed by screws or the like. The waveguide component 40, like the first component 10, can be a conductive component such as a metal component, or a conductive film such as a metal film is provided on the surface of an insulating component such as a resin. The waveguide component 40 is not in contact with the second component 20, but is provided at a distance from the conductive surface 21 of the second component 20. In this specification, the "contact" of two components with conductive surfaces means that they are physically abutted and electrically connected to each other. The surface of the waveguide component 40 opposite to the conductive surface 21 (the end surface on the +Z direction side) is a conductive waveguide surface 41. The waveguide surface 41 extends along the extension direction of the waveguide component 40. A gap 42 is formed between the conductive surface 21 and the waveguide surface 41. A waveguide for electromagnetic waves is formed in the gap 42. That is, the electromagnetic waves propagate in the gap 42.

[0058] The plurality of rods 30 are formed integrally with the first component 10 as a part of the first component 10, for example, and extend from the conductive surface 11 to the second component 20. The rods 30 have a conductive surface. The rods 30 may be a conductive component such as a metal component, as with the first component 10, or may be a conductive film such as a metal film provided on the surface of an insulating component such as a resin. A gap 31 is formed between the front end of the rod 30 and the conductive surface 21 of the second component 20, and the front end of the rod 30 does not contact the conductive surface 21. By arranging the plurality of rods 30 around the waveguide component 40, the plurality of rods 30 function as a magnetic wall, and it is possible to suppress the electromagnetic waves propagating in the gap 42 on the waveguide component 40 from leaking to the side. In addition, as long as the gap 31 is formed between the front end of the rods 30 arranged in the range that exerts the effect of suppressing electromagnetic wave leakage and the conductive surface 21, the front end of some of the plurality of rods 30 may also contact the conductive surface 21.

[0059] The plurality of rods 30 are, for example, in the shape of a rectangular parallelepiped. When the wavelength in free space of the electromagnetic wave propagating in the waveguide device 100 is λ0, the arrangement periods T1 and T2 of the plurality of rods 30 are smaller than λ0 / 2, for example, about λ0 / 4, for example, within the range of λ0 / 4±λ0 / 8. The arrangement period T1 and the arrangement period T2 may be the same or different. The widths W1 and W2 of the rods 30 and the intervals D1 and D2 of the plurality of rods 30 are, for example, about λ0 / 8, for example, smaller than λ0 / 4 and larger than λ0 / 16. The width W1 and the width W2 may be the same or different. The interval D1 and the interval D2 may be the same or different. The rods 30 and the waveguide component 40 have approximately the same height H1, and the height H1 is, for example, greater than the widths W1 and W2 of the rods 30, for example, about λ0 / 4, for example, within the range of λ0 / 4±λ0 / 8. The height of the gap 31 between the tip of the rod 30 and the conductive surface 21 and the height of the gap 42 between the waveguide surface 41 and the conductive surface 21 have substantially the same height H2, and the height H2 is, for example, about λ0 / 8, for example, less than λ0 / 4. Here, the reason for using the free space wavelength λ0 is that the wavelength of the electromagnetic wave propagating in the waveguide device 100 changes in various ways due to the influence of the size and shape of each part of the device, and is therefore difficult to grasp. The frequency band used in the waveguide device 100 is, for example, 30 GHz to 300 GHz.

[0060] In addition, the waveguide device 100 includes a wall portion 50 extending from the conductive surface 11 of the first component 10 to the conductive surface 21 of the second component 20. The wall portion 50 is formed integrally with the first component 10 as a part of the first component 10, protrudes from the conductive surface 11, and contacts the conductive surface 21 of the second component 20 at the upper end (end in the +Z direction). The wall portion 50, like the first component 10, may be a conductive component such as a metal component, or a conductive film such as a metal film may be provided on the surface of an insulating component such as a resin. The wall portion 50 is arranged adjacent to the waveguide component 40. That is, no other components such as the rod 30 are arranged in the adjacent area between the wall portion 50 and the waveguide component 40, and the wall portion 50 is opposite to the waveguide component 40 without other components. The wall portion 50 is arranged adjacent to only the straight portion of the waveguide component 40. Here, "adjacent" means a state of being arranged close to each other through a space or a dielectric without being separated by other conductive objects. In such a case, the distance between two adjacent components having a conductive surface is, for example, about λ0 / 4. The side surface 51 of the wall portion 50 facing the waveguide component 40 has an extension along the direction in which the waveguide component 40 extends. At least the side surface 51 of the wall portion 50 is conductive, for example, electrically conductive with the conductive surface 11 of the first component 10 and the conductive surface 21 of the second component 20. Here, "electrical conduction" includes not only the case where a part of the wall portion 50 is physically in contact with these conductive surfaces 11, 21, but also includes the case where they are separated from each other by a small non-conductive gap, and are not conductive in direct current, but are coupled at high frequencies in the use frequency band and are conductive to each other. In this specification, it is referred to as the state of "high-frequency coupling". The small gap has, for example, a gap size of less than 100μm (for example, less than λ0 / 40 when the center frequency of the use frequency band (operating frequency band) is 79GHz), and the gap can be an air layer or a dielectric layer such as a non-conductive resin. In addition, the size of the micro-gap that produces the high-frequency coupling state depends on at least the area of ​​the two conductive surfaces facing each other with the micro-gap. Therefore, for example, even if two components with conductive surfaces are arranged in a manner with a micro-gap of more than 100 μm, whether it is a high-frequency coupling state depends on the structure at that time. This can be determined based on the results of electromagnetic simulation in the design stage.

[0061] The side surface 51 of the wall portion 50 extends along the waveguide component 40. The so-called along the waveguide component 40 includes not only the case where the side surface 51 is completely parallel to the waveguide component 40, but also the case where the side surface 51 is inclined relative to the waveguide component 40. The length L of the side surface 51 of the wall portion 50 in the direction along the waveguide component 40 (X direction) can be selected in various sizes, for example, larger than the interval between the conductive surface 11 and the conductive surface 21 at the position of the wall portion 50. When the length L is less than half the wavelength of the electromagnetic wave propagating in the waveguide device 100, the difference with the width W1 of the rod 30 in the direction along the waveguide component 40 becomes smaller, and the effect of suppressing the electromagnetic wave propagating in the gap 42 on the waveguide component 40 from leaking to the side will be disturbed. Therefore, the length L of the side surface 51 of the wall portion 50 is preferably greater than λ0 / 2, more preferably greater than 3λ0 / 4, and further preferably greater than λ0. The width of the wall portion 50 in the Y direction is, for example, λ0 / 8, and can also be greater than λ0 / 4. As described above, the arrangement period T of the plurality of rods 30 is about λ0 / 4, and therefore, the length L is preferably at least twice the arrangement period T, more preferably at least three times, and even more preferably at least four times. Figure 2 In the example of FIG. 1 , the length L is 4.5 times the arrangement period T of the plurality of rods 30. Alternatively, the length L may be set to be equal to or less than λ0 / 2.

[0062] The upper edge of the side surface 51 of the wall portion 50 is preferably in contact with the conductive surface 21 of the second component 20 or coupled at high frequency, so as to be electrically connected with the conductive surface 21. It is preferred that at least a portion of the upper end of the wall portion 50 (or including the upper surface. The same applies below) is in contact with the conductive surface 21 of the second component 20 or coupled at high frequency, and is electrically connected. The upper end of the wall portion 50 and the conductive surface 21 are not only in contact or close contact (close fit), but the wall portion 50 may be a part of the second component 20, or may be fixed integrally by diffusion bonding, riveting, screw fastening, etc. Moreover, it is also possible to have a structure in which a conductive component such as a conductive adhesive, conductive oil, conductive rubber, or conductive resin with elasticity is provided between the upper end of the wall portion 50 and the conductive surface 21. In addition, it is also possible that there is a small space between the upper end of the wall portion 50 and the conductive surface 21 or they are electrically separated by a thin non-conductive film. Even in this case, when the frequency band of the electromagnetic wave used is in a high-frequency coupling state, the electromagnetic wave leakage suppression effect produced by the wall portion 50 can be obtained. In other words, as long as there is an electromagnetic wave leakage suppression effect produced by the wall portion 50, it can be considered that the wall portion 50 and the second component 20 are in a high-frequency coupling state.

[0063] [Comparative Example]

[0064] Figure 3 (a) is a cross-sectional view of a waveguide device 1000 of a comparative example. Figure 3(b) is a perspective view of the second component 20 in the waveguide device 1000 of the comparative example. Figure 3 (a) and Figure 3 As shown in (b), in the waveguide device 1000 of the comparative example, no wall portion is provided adjacent to the waveguide component 40. The rod 30 is also provided at the location where the wall portion 50 is provided in Example 1. By arranging a plurality of rods 30 on both sides of the waveguide component 40, it is possible to suppress the electromagnetic waves propagating in the gap 42 on the waveguide component 40 from leaking to the side.

[0065] According to the comparative example, a plurality of rods 30 are provided adjacent to the waveguide component 40 on both sides of the waveguide component 40, and no wall portion is provided. The rods 30 are provided at intervals from the second component 20 in order to suppress leakage of electromagnetic waves propagating in the gaps 42 on the waveguide component 40. Therefore, for example, in the case where a surrounding wall is provided outside the waveguide region outside the region where the plurality of rods 30 are provided, and the first component 10 and the second component 20 are fixed by the surrounding wall, as in Patent Document 1, there is a case where, when the first component 10 and / or the second component 20 is warped, the interval between the waveguide surface 41 of the waveguide component 40 and the conductive surface 21 of the second component 20 changes, causing the height of the gap 42 on the waveguide component 40 to be different from the desired size. It is known that by forming concavo-convex on the waveguide surface 41, the phase of the propagated electromagnetic wave changes, and the effect of the concavo-convex depends on the interval between the waveguide surface 41 and the conductive surface 21. Based on the above situation, it is required that the distance between the waveguide surface 41 and the conductive surface 21 be accurately the required size. When the distance between the waveguide surface 41 and the conductive surface 21 changes and causes the height of the gap 42 on the waveguide component 40 to be different from the required size, the propagation characteristics of the electromagnetic wave may be degraded.

[0066] On the other hand, in Example 1, Figure 1 (b) and Figure 2 As shown, the wall portion 50 is provided adjacent to the waveguide component 40 without interposing the rod 30. Thus, the interval between the first component 10 and the second component 20 near the waveguide component 40 is defined by the wall portion 50, so that even when the first component 10 and / or the second component 20 is warped, the height of the gap 42 on the waveguide component 40 can be set to a desired size.

[0067] [Simulation 1]

[0068] Electromagnetic simulation was performed to obtain S parameters of the waveguide devices of Example 1 and Comparative Example. The simulation conditions were as follows.

[0069] Common conditions for Example 1 and Comparative Example

[0070] Center frequency of the operating band: 79 GHz

[0071] Width of the rod 30 in the X and Y directions: λ0 / 8

[0072] Interval of rod 30: λ0 / 8

[0073] Height of the rod 30 and the waveguide member 40 in the Z direction: λ0 / 4

[0074] The distance between the rod 30 and the waveguide member 40: λ0 / 8

[0075] The distance between the tip of the rod 30 and the waveguide member 40 and the conductive surface 21: λ0 / 8

[0076] Conditions of Example 1

[0077] Wall portion 50: in contact with the second member 20

[0078] Width of the wall 50 in the Y direction: λ0 / 8

[0079] Length of the wall portion 50 in the X direction: λ0

[0080] The distance between the wall 50 and the waveguide member 40: λ0 / 8

[0081] Figure 4 (a) is the result of simulation 1 of the comparative example, Figure 4 (b) is the result of simulation 1 of Example 1. Figure 4 (a) and Figure 4 In (b), the solid line represents the frequency characteristic of S11, and the dotted line represents the frequency characteristic of S21. S11 represents the return loss, which represents the leakage degree of the electromagnetic wave propagating in the gap 42 on the waveguide component 40. Figure 4 As shown in (a), in the comparative example, S11 indicating the return loss is slightly larger than -30 dB near 75 GHz, but is basically below -30 dB in the range of 75 GHz to 82 GHz. This indicates the electromagnetic wave propagation blocking effect produced by the plurality of rods 34. Figure 4 As shown in (b), in Example 1, S11, which indicates the return loss, is below -30 dB in the entire range of 75 GHz to 82 GHz. Figure 4 The comparative example (a) has excellent characteristics. That is, it is known that when the wall portion 50 is provided adjacent to the waveguide component 40, an electromagnetic wave propagation blocking effect equal to or greater than that when only the rod 30 is provided without the wall portion 50 can be obtained.

[0082] In Example 1, in addition to the waveguide on the waveguide component 40 formed by arranging a plurality of rods 30 on both sides of the waveguide component 40, a waveguide is also formed on the waveguide component 40 in the portion adjacent to the wall portion 50. The waveguide formed in the portion adjacent to the wall portion 50 is referred to as a waveguide A. The waveguide A is formed by being adjacent to the wall portion 50 on one side and adjacent to the rods 30 on the other side. Such a waveguide A has not been disclosed so far and is a new waveguide. According to Figure 4 (a) and Figure 4 From the simulation result of (b), it can be seen that the impedance of the waveguide A adjacent to the wall portion 50 is different from the impedance of the other waveguides clamped by the rod 30. Therefore, by configuring the wall portion 50 and adjusting its length L, the phase of the signal wave propagating in the waveguide can be adjusted. In addition, it is also clarified that the wavelength of the electromagnetic wave propagated in the portion adjacent to the waveguide component 40 on the side 51 of the wall portion 50 is extended by about 3%. From the above content, it can be seen that the waveguide A is a new waveguide that has not existed so far. In addition, the structure in which the wall portion 50 is configured at positions adjacent to both sides of the waveguide component 40 is the same structure as, for example, a waveguide tube with a ridge structure having an H-shaped cross-section, and therefore, it can be understood to be within the scope of the known technology.

[0083] [Simulation 2]

[0084] An electromagnetic simulation was performed to obtain an S parameter when a gap was formed between the wall portion 50 and the second member 20 . Figure 5 (a) is a cross-sectional view of the waveguide device used in simulation 2. Figure 5 As shown in (a) of FIG. 2 , a waveguide device used in simulation 2 has a gap 80 formed between the wall portion 50 and the second component 20. The width of the wall portion 50 is different from that in Example 1. The other structures are the same as those in Example 1. In simulation 2, the S parameter is obtained when the interval h between the wall portion 50 and the second component 20 is made different according to the height of the gap 80.

[0085] The simulation conditions are as follows.

[0086] Center frequency of the operating band: 79 GHz

[0087] Width of the rod 30 in the X and Y directions: λ0 / 8

[0088] Interval of rod 30: λ0 / 8

[0089] Height of the rod 30 and the waveguide member 40 in the Z direction: λ0 / 4

[0090] The distance between the rod 30 and the waveguide member 40: λ0 / 8

[0091] The distance between the tip of the rod 30 and the waveguide member 40 and the conductive surface 21: λ0 / 8

[0092] The distance h between the wall 50 and the conductive surface 21 is: 0 mm, 0.025 mm, 0.05 mm, 0.075 mm, 0.1 mm

[0093] Width of the wall 50 in the Y direction: 3λ0 / 8

[0094] Length of the wall portion 50 in the X direction: λ0

[0095] The distance between the wall 50 and the waveguide member 40: λ0 / 8

[0096] Figure 5 (b) is the result of simulation 2. Figure 5 (b) shows the frequency characteristics of S21. Figure 5 As shown in (b), it can be seen that: the larger the interval h, the more deteriorated S21 is, but when the interval h is sufficiently small relative to the wavelength, even when the wall portion 50 is not in contact with the second component 20, S21 can be suppressed to a degree of degradation that does not hinder the performance of blocking electromagnetic wave propagation generated by the wall portion 50. Even in the case where the gap 80 is formed as described above, if the reduction of S21 caused by the gap 80 is within the allowable range in the use application, it can be said that the wall portion 50 and the second component 20 are in a high-frequency coupling state. The reduction of S21 varies depending on the relative area and interval between the wall portion 50 and the second component 20, and whether the reduction of S21 is within the allowable range varies depending on the characteristics expected of the waveguide according to the use application and the required performance.

[0097] [Simulation 3]

[0098] An electromagnetic simulation was performed to obtain an S parameter when a dielectric film was provided between the wall portion 50 and the second member 20 . Figure 6 (a) is a cross-sectional view of the waveguide device used in simulation 3. Figure 6 As shown in (a) of FIG. 3 , the waveguide device used in simulation 3 has a dielectric film 82 provided between the wall portion 50 and the second member 20. The width of the wall portion 50 is different from that in Example 1. The other structures are the same as those in Example 1. In simulation 3, the S parameter is obtained when the interval h between the wall portion 50 and the second member 20 is made different according to the thickness of the dielectric film 82.

[0099] The simulation conditions are as follows.

[0100] Center frequency of the operating band: 79 GHz

[0101] Width of the rod 30 in the X and Y directions: λ0 / 8

[0102] Interval of rod 30: λ0 / 8

[0103] Height of the rod 30 and the waveguide member 40 in the Z direction: λ0 / 4

[0104] The distance between the rod 30 and the waveguide member 40: λ0 / 8

[0105] The distance between the tip of the rod 30 and the waveguide member 40 and the conductive surface 21: λ0 / 8

[0106] The distance h between the wall 50 and the conductive surface 21 is: 0 mm, 0.025 mm, 0.05 mm, 0.075 mm, 0.1 mm

[0107] Width of the wall 50 in the Y direction: 3λ0 / 8

[0108] Length of the wall portion 50 in the X direction: λ0

[0109] The distance between the wall 50 and the waveguide member 40: λ0 / 8

[0110] Dielectric film 82: Engineering plastic with relative dielectric constant of 3.2 and tanδ of 0.005

[0111] Figure 6 (b) is the result of simulation 3. Figure 6 (b) shows the frequency characteristics of S21. Figure 6 As shown in (b), it can be seen that: even when the dielectric film 82 is provided between the wall portion 50 and the second component 20, the larger the interval h, the more deteriorated S21 is, but when the interval h is sufficiently small relative to the wavelength, S21 can be suppressed to a degree of degradation that does not hinder the performance of blocking electromagnetic wave propagation generated by the wall portion 50. Even in the case where the dielectric film 82 is provided as described above, if the reduction of S21 caused by the dielectric film 82 is within the allowable range in the use application, it can be said that the wall portion 50 and the second component 20 are in a high-frequency coupling state. The reduction of S21 varies depending on the relative area and interval between the wall portion 50 and the second component 20, and whether the reduction of S21 is within the allowable range varies depending on the characteristics expected of the waveguide according to the use application and the required performance.

[0112] As described above, according to Example 1, Figure 2 As shown, the wall portion 50 is disposed adjacent to the waveguide component 40 without interposing the rod 30 therebetween. The wall portion 50 is disposed between the conductive surface 11 of the first component 10 and the conductive surface 21 of the second component 20 in contact with or high-frequency coupled with the conductive surface 11 and the conductive surface 21. Thus, in the vicinity of the waveguide component 40, the interval between the first component 10 and the second component 20 is defined by the wall portion 50, so that even when the first component 10 and / or the second component 20 is warped, the height of the gap 42 on the waveguide component 40 can be made a desired size. In addition, the side surface 51 of the wall portion 50 opposite to the waveguide component 40 is conductive. Therefore, the wall portion 50 can function as an electrical wall, such as Figure 4 As shown in (b), a good electromagnetic wave propagation blocking effect can be obtained.

[0113] In addition, in Example 1, the length L of the wall portion 50 along the waveguide component 40 in the surface direction of the conductive surface 11 is greater than the interval between the conductive surface 11 and the conductive surface 21 at the position of the wall portion 50. As a result, the difference between the length L of the wall portion 50 and the width W1 of the rod 30 in the direction along the waveguide component 40 can be suppressed from becoming smaller, and the "effect of suppressing the lateral leakage of the electromagnetic wave propagating in the gap 42 on the waveguide component 40" can be suppressed. Therefore, a good electromagnetic wave propagation blocking effect can be obtained for the electromagnetic wave propagating in the gap 42. The length L is preferably 1.5 times or more of the interval between the conductive surface 11 and the conductive surface 21, more preferably 2.0 times or more, and further preferably 2.5 times or more. On the other hand, if the length L becomes too long, the effect of suppressing the lateral leakage of electromagnetic waves propagating in the gap 42 on the waveguide component 40 will also be disrupted. Therefore, the length L is preferably less than 5 times the distance between the conductive surface 11 and the conductive surface 21, more preferably less than 4 times, and further preferably less than 3 times.

[0114] In addition, in Example 1, when the free space wavelength of the center frequency of the frequency band used by the waveguide device 100 is λ0, the length L of the wall portion 50 along the waveguide component 40 in the surface direction of the conductive surface 11 is greater than λ0 / 2. As a result, the difference between the length L of the wall portion 50 and the width W1 of the rod 30 in the direction along the waveguide component 40 can be suppressed from becoming smaller, and the "effect of suppressing the lateral leakage of electromagnetic waves propagating in the gap 42 on the waveguide component 40 is suppressed from being disturbed", so that a good electromagnetic wave propagation blocking effect can be obtained for the electromagnetic waves propagating in the gap 42. The length L is preferably greater than 3λ0 / 4, more preferably greater than λ0, and further preferably greater than 5λ0 / 4. On the other hand, if the length L becomes too long, the effect of suppressing the lateral leakage of electromagnetic waves propagating in the gap 42 on the waveguide component 40 will also be disturbed, so the length L is preferably less than 3λ0, more preferably less than 2.5λ0, and further preferably less than 2.0λ0.

[0115] In addition, in Example 1, Figure 2 As shown, the side surface 51 of the wall portion 50 extends along the waveguide member 40. As a result, the function of the wall portion 50 as an electric barrier is improved, and a good electromagnetic wave propagation blocking effect can be obtained.

[0116] In addition, in Example 1, Figure 2 As shown, the side surface 51 of the wall portion 50 is adjacent to the straight portion of the waveguide member 40. Thus, the function of the wall portion 50 as an electric barrier is easily improved, and a good electromagnetic wave propagation blocking effect is easily obtained.

[0117] In addition, in Example 1, Figure 2 As shown, a part of the plurality of rods 30 is disposed adjacent to the waveguide component 40 on the side opposite to the wall portion 50 across the waveguide component 40. Thus, it is possible to suppress the electromagnetic waves propagating in the gaps 42 on the waveguide component 40 from leaking to the side, and a good electromagnetic wave propagation blocking effect can be obtained for the electromagnetic waves propagating in the gaps 42.

[0118] In addition, in Example 1, a part of the plurality of rods 30 is disposed on both sides of the wall portion 50 in the direction in which the waveguide component 40 extends. Thus, it is possible to suppress the electromagnetic waves propagating in the gaps 42 on the waveguide component 40 from leaking to the side, and a good electromagnetic wave propagation blocking effect can be obtained for the electromagnetic waves propagating in the gaps 42.

[0119] [Modifications]

[0120] Figure 7 (a) and Figure 7 (b) is a cross-sectional view of the waveguide devices 110 and 120 of the modified examples 1 and 2 of the embodiment 1. Figure 7 (c) is a perspective view showing the rod 30 in the third modification of the first embodiment. Figure 7 As shown in (a), in the waveguide device 110 of the modification 1 of the embodiment 1, the edge portions of the rod 30, the waveguide component 40 and the wall portion 50 are in an R shape (rounded corners). The R shape may also be a chamfer. By forming the edge portions of the rod 30 and the waveguide component 40 in an R shape or a chamfered shape, the frequency characteristics in the propagation of electromagnetic waves, especially the effect of widening the operating frequency band, can be seen through electromagnetic simulation. In addition, the size of these R shapes or chamfers, and the part where the R shape or chamfer is used can be determined based on the results of electromagnetic simulation during design. Therefore, conceivable deformations can be made.

[0121] like Figure 7 As shown in (b), in the waveguide device 120 of the second variant of the first embodiment, the rod 30, the waveguide component 40 and the wall portion 50 are in a shape that gradually tapers from the conductive surface 11 to the conductive surface 21. In other words, the side surfaces of these components are tapered. By making the rod 30, the waveguide component 40 and the wall portion 50 in a gradually tapering shape, when the rod 30, the waveguide component 40 and the wall portion 50 are formed together with the first component 10 by molding resin or metal, the ease of molding is increased. In addition, it can be seen through electromagnetic simulation that by making the rod 30, the waveguide component 40 and the wall portion 50 in a gradually tapering shape, it is possible to improve the frequency characteristics in the propagation of electromagnetic waves. In addition, the tapered shape is not only a case of continuous tapering, but can also be a shape that first tapers once and then maintains the same thickness, or can be a shape that further tapers again. As long as it is a shape that does not have at least a gradually thickening part.

[0122] like Figure 7 As shown in (c), the rod 30 in the modification 3 of the embodiment 1 is cylindrical. That is, the rod 30 is circular in a plan view. It can be seen from the electromagnetic simulation that by making the rod 30 cylindrical, the frequency characteristics in the electromagnetic wave propagation, especially the working frequency band, can be improved. In addition, the rod 30 can also be an elliptical cylinder, that is, an elliptical shape in a plan view, or an oblong shape in a plan view.

[0123] In addition, structures with rounded corners, such as the R shape (rounded corners) or chamfered structure of the edge portion described in variant example 1 of embodiment 1, the conical structure described in variant example 2 of embodiment 1, and the cylindrical structure described in variant example 3 of embodiment 1, can also be applied to embodiments after embodiment 2.

[0124] Figure 8 (a) to Figure 8 (d) is a cross-sectional view of Modification 4 to Modification 7 of Embodiment 1. Figure 8 As shown in (a) of FIG. 1 , a gap 80 is formed between the wall portion 50 and the second member 20. Figure 8 As shown in (b) of FIG. 1 , a dielectric film 82 is provided between the wall portion 50 and the second member 20. Figure 8 As shown in (c) of FIG. 1 , a gap 80 is formed between the wall portion 50 and the first member 10. Figure 8 As shown in (d) of FIG. 1 , a dielectric film 82 is provided between the wall portion 50 and the first component 10. Even if a gap 80 or a dielectric film 82 is provided between the wall portion 50 and the first component 10 or the second component 20 as described above, if the reduction of S21 caused by the gap 80 or the dielectric film 82 is within the range that can be allowed in the use application, it can be said that the wall portion 50 and the first component 10 or the second component 20 are in a high-frequency coupling state. In addition, the gap 80 or the dielectric film 82 may be provided between the wall portion 50 and both the first component 10 and the second component 20. The height of the gap 80 and the thickness of the dielectric film 82 are dimensions that can achieve high-frequency coupling, for example, less than λ0 / 40.

[0125] Example 2

[0126] Fig. 9 (a) is a cross-sectional view of the waveguide device 200 of Example 2, Fig. 9 (b) is a perspective view of the waveguide device 200 of Example 2, in which the second component 20 and the fixing component 60 are seen through. Fig. 9 (a) is equivalent to Fig. 9 (b) is the cross section of the area between AA. Fig. 9 (a) and Fig. 9 As shown in (b) of FIG. 1 , the waveguide device 200 of Example 2 includes two waveguide components 40. Both of the two waveguide components 40 extend in the X direction and are arranged in the Y direction.

[0127] Two wall portions 50a are provided adjacent to each of the two waveguide components 40. The two wall portions 50a adjacent to one of the two waveguide components 40 are located on the opposite side of the other waveguide component 40 with one waveguide component 40 interposed therebetween. The two wall portions 50a adjacent to the other waveguide component 40 are located on the opposite side of the one waveguide component 40 with the other waveguide component 40 interposed therebetween. A through hole 54 is provided in the wall portion 50a, and the through hole 54 passes through between an upper end 52 that contacts or is coupled with a high frequency to the conductive surface 21 of the second component 20 and a lower end 53 on the opposite side to the upper end 52. In addition, a through hole 13 that passes through the first component 10 is provided in the first component 10 at a position corresponding to the through hole 54, and a through hole 23 that passes through the second component 20 is provided in the second component 20.

[0128] In addition, the waveguide device 200 of the second embodiment has a fixing member 60. The fixing member 60 is, for example, a screw such as a bolt. The fixing member 60 is integrally formed of a shaft portion 61 and an umbrella portion 62. The shaft portion 61 passes through the through hole 23 of the second member 20, the through hole 54 of the wall portion 50a, and the through hole 13 of the first member 10, and is passed out in the -Z direction of the first member 10, where it is fastened and fixed by a fixing member 63 such as a nut. The umbrella portion 62 is arranged at a position closer to the +Z direction side than the second member 20, receives the fastening pressure transmitted to the shaft portion 61, and transmits it to the second member 20, thereby fixing the second member 20 to the wall portion 50a. In addition, as another fixing method, it can be fixed by fitting the thread teeth that form an external thread provided on the shaft portion 61 with the thread teeth that form an internal thread provided on the inner surface of the through hole 54 of the wall portion 50, or it can be fixed by other fixing methods. The other structures are the same as those of the first embodiment, so the description is omitted.

[0129] A conventional WRG waveguide device is composed of a plurality of layers. These layers are assembled using fixing parts such as bolts to maintain a certain spacing. In the previous WRG waveguide device, the spacing is ensured in the Z direction by using components such as spacers arranged between the layers, or by integrating the spacers with the layers. Such spacers are arranged outside the waveguide area as in Patent Document 1.

[0130] On the other hand, according to the second embodiment, the second component 20 is fixed to the wall portion 50a provided adjacent to the waveguide component 40 by the fixing component 60. That is, the second component 20 is pressed against the wall portion 50a by the fixing component 60, and the upper end 52 of the wall portion 50a is in close contact with the conductive surface 21 of the second component 20. Thus, the interval between the first component 10 and the second component 20 can be ensured to be of a good size. Thus, in the second embodiment, the wall portion 50a plays the role of a spacer. In the patent document 1, the spacer is arranged outside the waveguide area, so it is necessary to ensure an area for setting the spacer in the outer periphery of the waveguide device. Therefore, the waveguide device will be enlarged. In the second embodiment, the wall portion 50a provided in the waveguide area adjacent to the waveguide component 40a acts as a spacer, so the waveguide device 200 can be miniaturized. In addition, the conductive surface 11 of the first component 10 and the conductive surface 21 of the second component 20 are electrically connected via the wall portion 50a, so that the effect of suppressing electromagnetic wave leakage is also improved.

[0131] In the second embodiment, the wall portion 50a has a through hole 54 at the upper end 52 that contacts the conductive surface 21 of the second component 20. The second component 20 is fixed to the wall portion 50a by inserting the fixing member 60 into the through hole 54. Thus, the second component 20 can be firmly fixed to the wall portion 50a. Fig.10 In this way, a recessed portion 59 having a bottom surface is provided at the upper end 52 of the wall portion 50a instead of the through hole 54, and the fixing member 60 is inserted into the recessed portion 59. In addition, the through hole 54 and the recessed portion 59 are not limited to the case where they are provided at the upper end 52 in contact with the conductive surface 21, and may also be provided at the upper surface that is not in contact with the conductive surface 21.

[0132] In addition, in Example 2, it can also be like Fig.11 (a) and Fig.11 As in (b), a gap 80 or a dielectric film 82 is provided between the wall portion 50a and the second member 20. Fig.11 (c) and Fig.11 As in (d), a gap 80 or a dielectric film 82 is provided between the wall portion 50a and the first component 10. Even if a gap 80 or a dielectric film 82 is provided between the wall portion 50a and the first component 10 or the second component 20 as described above, if the reduction of S21 caused by the gap 80 or the dielectric film 82 is within the allowable range in the application, it can be said that the wall portion 50a and the first component 10 or the second component 20 are in a high-frequency coupling state. In addition, it is also possible that a gap 80 or a dielectric film 82 is provided between the wall portion 50a and both the first component 10 and the second component 20. In addition, Fig.11 (a) to Fig.11In (d) , the fixing member 60 and the like are omitted for clarity of the drawing.

[0133] In addition, in Example 2, the conductive surface 21 of the second component 20 is in contact with only the upper ends 52 of the four wall portions 50a. In Patent Document 1, the portion corresponding to the spacer is realized by a surrounding wall provided in the outer portion of the component corresponding to the first component 10 and outside the waveguide region outside the rod. That is, the upper end of the surrounding wall is in contact with the lower surface of the component corresponding to the second component 20, and a gap corresponding to the height of the surrounding wall is ensured. When comparing the structure of Patent Document 1 with the structure of Example 2, in Patent Document 1, the size of the waveguide device is increased by an amount corresponding to the region of the surrounding wall. In addition, in the structure of Patent Document 1, the component corresponding to the first component 10 and the component corresponding to the second component 20 are fixed only at the peripheral surrounding wall portion, so when there is warpage in the central portion of these components, the gap between the two components at the central portion will change. In Example 2, the wall portion 50a is provided in the waveguide region, that is, inside the rod 30. If a clever design is performed, the wall portion 50a can be provided in any waveguide region. Thus, even when warping occurs in the central portion, for example, the height of the gap 42 between the waveguide surface 41 of the waveguide component 40 and the conductive surface 21 of the second component 20 can be made to be more uniform and accurate.

[0134] The return loss of the waveguide device 200 of Example 2 was obtained by electromagnetic simulation. As a result, S11 indicating the return loss was -28 dB or less in the entire range of 75 GHz to 82 GHz. That is, even when the wall portion 50a of the size of the insertion fixing member 60 is used, the wall portion 50a has a sufficient effect of suppressing electromagnetic wave leakage, and the waveguide device 200 has excellent transmission characteristics.

[0135] [Modifications]

[0136] Fig.12 (a) and Fig.12 (b) is a perspective view showing the vicinity of the wall portion 50a in the modification examples 1 and 2 of the embodiment 2. Fig.12 (c) is Fig.12 (a) Fig.12 (b) is a cross-sectional view of the wall at AA. Fig.12 (a) and Fig.12As shown in (c), in the modification 1 of the embodiment 2, a groove 70 located between the through hole 54 and the waveguide component 40 is provided at the upper end 52 of the wall portion 50a. The groove 70 extends along the extension direction of the waveguide component 40. The so-called along the extension direction of the waveguide component 40 includes, in addition to the case where the groove 70 is completely parallel to the waveguide component 40, the case where the groove 70 is inclined within a range of 30° or less relative to the waveguide component 40. The groove 70 is, for example, open on two opposite side walls of the wall portion 50a, but it may also be a case where it does not reach the two side walls. The depth D of the groove 70 is, for example, λ0 / 4. The other structures are the same as those in the embodiment 2, and therefore the description is omitted.

[0137] The groove 70 forms a waveguide in the depth direction. The electromagnetic wave that penetrates into the groove 70 propagates in the depth direction of the groove 70 and is reflected at the bottom. When the reflected electromagnetic wave returns to the entrance of the groove 70, the phase changes by 180° relative to the phase when it penetrates. As a result, the reflected electromagnetic wave reflected at the bottom of the groove 70 and the intrusive electromagnetic wave that penetrates into the groove 70 cancel each other out, so that the electromagnetic wave is attenuated. This is the effect of the electromagnetic wave propagation blocking effect of the groove 70.

[0138] The width W of the groove 70 is not particularly limited, and is, for example, less than λ0 / 4, for example, about λ0 / 8. The groove 70 only needs to be formed at the upper end 52 of the wall portion 50a, outside the through hole 54 and inside the side wall on the waveguide component 40 side. The side surface of the groove 70 may also have a tapered shape that gradually expands from the bottom. This tapered shape is not only a case where its width continuously expands as the height from the bottom increases, but also a case where the width of a part does not expand but is constant. That is, the tapered shape only needs to be a shape where at least its width does not narrow as the height from the bottom increases.

[0139] like Fig.12 (b) and Fig.12 As shown in (c), in the second modification of the second embodiment, the groove 70a is provided in a manner to surround the through hole 54. That is, the groove 70a is located at a position closer to the outside than the through hole 54 and closer to the inside than the side wall of the wall portion 50a, and is provided at the upper end 52 of the wall portion 50a in a manner to surround the through hole 54. When viewed from above, the shape of the groove 70a can be a rectangular shape with rounded corners, or it can be a circle. In addition, the groove 70a can also be a tapered shape like the groove 70. The other structures are the same as those in the second embodiment, so the description is omitted.

[0140] The return loss of the waveguide device of Modifications 1 and 2 of Example 2 was obtained by electromagnetic simulation. As a result, S11 indicating the return loss was -30 dB or less in the entire range of 75 GHz to 82 GHz. This confirmed the electromagnetic wave leakage blocking effect of the grooves 70 and 70a.

[0141] In addition, the depth D of the grooves 70 and 70a is preferably λ0 / 4, but it can be within the range of λ0 / 4±λ0 / 8. When the depth D of the grooves 70 and 70a is within the range of λ0 / 4±λ0 / 8, it is clear from the simulation results and the actual measurement results that there is an electromagnetic wave propagation blocking effect. Specifically, in the design stage, the depth D that achieves the best blocking effect can be selected based on the relationship with the surrounding parts.

[0142] As described above, according to the variations 1 and 2 of the second embodiment, Fig.12 (a) and Fig.12 As shown in (b), the wall portion 50a has grooves 70, 70a at the upper end 52, which are located between the through hole 54 and the waveguide component 40 and along the extension direction of the waveguide component 40. The depth D of the grooves 70, 70a is within the range of λ0 / 4±λ0 / 8. As a result, the electromagnetic waves that penetrate into the grooves 70, 70a and the electromagnetic waves that penetrate into the grooves 70, 70a and are reflected at the bottom cancel each other out and attenuate. Therefore, it is possible to suppress the electromagnetic waves propagating in the gap 42 on the waveguide component 40 from leaking out from the through hole 54.

[0143] In addition, in the variation 2 of the embodiment 2, as Fig.12 As shown in (b) of FIG. 5 , the groove 70a is provided so as to surround the through hole 54. This can further suppress the leakage of electromagnetic waves.

[0144] The grooves 70 and 70a shown in the modified examples 1 and 2 of the second embodiment can also be applied to other embodiments. By applying the grooves 70 and 70a, the electromagnetic wave leakage can be further reduced, and a high-performance waveguide device can be realized.

[0145] Example 3

[0146] Fig.13 (a) is a cross-sectional view of the waveguide device 300 of Example 3, Fig.13 (b) is a perspective view of the second component 20 in the waveguide device 300 of Example 3. Fig.13 (a) and Fig.13As shown in (b), the waveguide device 300 of Example 3 includes two waveguide components 40, each extending in the X direction and arranged in the Y direction, similar to Example 2. Two wall portions 50a are provided between the two waveguide components 40. The two wall portions 50a are adjacent to both waveguide components 40, and have a side 51a extending in the direction in which one waveguide component 40 extends and a side 51b extending in the direction in which the other waveguide component 40 extends. That is, the side surfaces 51a and 51b are opposite to the waveguide components 40, and no other components such as the rod 30 are provided between the waveguide components 40. The electromagnetic waves propagating in the gap 42 on the waveguide component 40 are not easily leaked to the side due to the electromagnetic wave propagation blocking function formed by the wall portion 50a and the rod 30 arranged on the side of the waveguide component 40. The other structures are the same as those in Example 2, so the description is omitted.

[0147] The return loss of the waveguide device 300 of Example 3 was obtained by electromagnetic simulation. As a result, S11 indicating the return loss was less than -30 dB in the entire range of 75 GHz to 82 GHz. That is, it can be confirmed that the wall portion 50a has a sufficient electromagnetic wave leakage blocking effect and the waveguide device 300 has excellent transmission characteristics.

[0148] According to Embodiment 3, the wall portion 50a is provided adjacent to both of the two waveguide members 40. Thus, the number of provided wall portions 50a can be reduced, and the waveguide device 300 can be further miniaturized.

[0149] Example 4

[0150] Fig.14 (a) is a cross-sectional view of a waveguide device 400 of Example 4, Fig.14 (b) is a perspective view of the second component 20 in the waveguide device 400 of Example 4. Fig.14 (a) and Fig.14 As shown in (b), the waveguide device 400 of Example 4 includes: three waveguide components 40 each extending in the X direction and arranged in the Y direction; and three wall portions 50a arranged between the waveguide components 40. The three wall portions 50a are arranged in a zigzag manner. The three wall portions 50a are all adjacent to the waveguide component 40 and have a side 51 extending in the direction in which the waveguide component 40 extends. The side 51 is opposite to the waveguide component 40, and no other components such as the rod 30 are arranged between them. A through hole 14 is provided in the first component 10, which is adjacent to the front end of the waveguide component 40 and penetrates the first component 10. The through hole 14 has a conductive inner side surface. The through hole 14 has the function of connecting the waveguide in the layer arranged below the first component 10 and the waveguide in the gap 42 formed on the waveguide component 40. The other structures are the same as those in Example 2, so the description is omitted.

[0151] In Examples 1 to 3, for the sake of convenience, the end of the waveguide component 40 is cut off and its outer side is excluded from the description. In Example 4, a through hole 14 is provided in the first component 10 adjacent to the front end of the waveguide component 40. For example, electromagnetic waves propagating in the gap 42 on the waveguide component 40 are input from the through hole 14 adjacent to one front end of the waveguide component 40 and output from the through hole 14 adjacent to the other front end of the waveguide component 40. Two rows of rods 30 are provided on the outside of the side of the through hole 14, forming a structure having an electromagnetic wave propagation blocking effect.

[0152] The return loss of the waveguide device 400 of Example 4 was obtained by electromagnetic simulation. As a result, S11 indicating the return loss was -30 dB or less in the entire range of 75 GHz to 82 GHz. That is, it can be confirmed that the wall portion 50a has a sufficient electromagnetic wave leakage blocking effect, and the waveguide device 400 has excellent transmission characteristics.

[0153] In the fourth embodiment, the first component 10 and the second component 20 are fixed to each other only by keeping the interval between them by the three wall portions 50a and the three fixing members 60. Fig. 9 (a) and Fig. 9 The same structure is also described in (b), but in Example 2, for example, there is a method in which a component not shown in the figure can exist on the outside of the end of the waveguide component 40. The waveguide device 400 of Example 4 is a waveguide device enclosed in a pair of layers formed by the first component 10 and the second component 20. There are no other components on the outer periphery of the first component 10 and the second component 20. In such a waveguide device 400, only three wall portions 50a and three fixing components 60 are used as components for fixing the first component 10 and the second component 20. This is different from the previous WRG waveguide device described in the above-mentioned patent document 1 and the like. As a result, as in Example 2, the effect of miniaturizing the waveguide device 400 can be obtained.

[0154] [Modifications]

[0155] Fig.15 (a) is a perspective view of the second component 20 in the waveguide device 410 of the modification 1 of the embodiment 4, Fig.15 (b) is a cross-sectional view of the waveguide device 410 of variant example 1 of embodiment 4. Fig.15 (b) is equivalent to Fig.15 (a) is a cross-sectional view of the area between AA. Fig.15 (a) and Fig.15As shown in (b), in the waveguide device 410 of the modification 1 of the embodiment 4, a column portion 72 having a width wider than the rod 30 provided around the waveguide component 40 is provided at the four corners of the first component 10. The column portion 72 has the same height as the wall portion 50a. Therefore, the column portion 72 contacts the conductive surface 11 of the first component 10 and contacts the conductive surface 21 of the second component 20. The other structures are the same as those of the embodiment 4, and therefore the description is omitted.

[0156] Fig.16 (a) is a perspective view of the second component 20 in the waveguide device 420 of the second modification of the fourth embodiment. Fig.16 (b) is a cross-sectional view of the waveguide device 420 of variant example 2 of embodiment 4. Fig.16 (b) is equivalent to Fig.16 (a) is a cross-sectional view of the area between AA. Fig.16 (a) and Fig.16 As shown in (b), in the waveguide device 420 of the second modification of the fourth embodiment, pillars 72a having the same width as the rod 30 are provided at the four corners of the first member 10 instead of the pillar 72. The pillars 72a have the same height as the wall 50a as the pillar 72, and are in contact with the conductive surface 11 of the first member 10 and the conductive surface 21 of the second member 20. The other structures are the same as those of the fourth embodiment, and therefore the description thereof is omitted.

[0157] According to the modified examples 1 and 2 of the fourth embodiment, the interval between the first component 10 and the second component 20 is adjusted by the three wall portions 50a and the four column portions 72 or 72a. Thus, the interval between the first component 10 and the second component 20 can be kept at an appropriate size in the entirety in which the first component 10 and the second component 20 are opposite. For example, in the case where the outer portion of the first component 10 is warped in the direction of reducing the interval relative to the second component 20, the column portions 72 and 72a are effective. Here, according to the simulation results, it is clear that the column portions 72 and 72a also have the function of suppressing the leakage of electromagnetic waves propagating inside the waveguide device in the same way as the rod 30. Therefore, it can be said that the column portions 72 and 72a are arranged in the waveguide area. In addition, the column portions 72 and 72a are not limited to the case where they are arranged at the four corners, but can also be arranged at any two corners, such as the case where the two corners are located on the diagonal line. In addition, it can also be arranged at a place where warping is particularly worried. Moreover, the column portion 72 is wider than the rod 30, so it can withstand even when the stress when the second component 20 abuts is strong.

[0158] Example 5

[0159] Fig.17 FIG. 2 is a perspective view of the second component 20 and the fixing component 60 in the waveguide device 500 of the fifth embodiment. Fig.17 As shown, in the waveguide device 500 of the fifth embodiment, in addition to the linear waveguide component 40, a waveguide component 40a bent into an L shape is also included. Adjacent to the linear waveguide component 40, there are provided: a wall portion 50 without a through hole; and a wall portion 50a with a through hole 54. Furthermore, adjacent to the front end of the waveguide components 40 and 40a, there is provided a through hole 14, which penetrates the first component 10 and has the function of connecting the waveguide formed on the waveguide components 40 and 40a and the waveguide of the layer below the first component 10. The other structures are the same as those of the second embodiment, and therefore the description is omitted.

[0160] In the fifth embodiment, the fixing member 60 is inserted into the through hole 54 provided in the wall portion 50a, and the upper end of the wall portion 50a abuts against the conductive surface 21 of the second member 20, thereby determining the size of the interval between the first member 10 and the second member 20. The wall portion 50a is adjacent to the waveguide member 40, so that the interval between the first member 10 and the second member 20 can be determined by the wall portion 50a, so that the height of the gap 42 between the waveguide surface 41 of the waveguide members 40, 40a and the conductive surface 21 of the second member 20 can be made to be a desired size. In addition, the wall portion 50 having a width substantially equal to that of the rod 30 is provided adjacent to the waveguide member 40 at a position separated from the wall portion 50a. The conductive surface 21 of the second member 20 also abuts against the upper end of the wall portion 50. Thus, the size of the interval between the first member 10 and the second member 20 can be made uniform within the range where the first member 10 and the second member 20 are opposed to each other.

[0161] As described above, in Example 5, the following two wall portions are provided: a wide wall portion 50a having a through hole 54 for inserting the fixing member 60; and a thin wall portion 50 without a through hole. The wall portion 50a plays the following two roles: determining the interval between the first component 10 and the second component 20; and fixing the second component 20 to the wall portion 50a. The position where the wall portion 50a is provided can be provided as long as it is adjacent to the waveguide component 40 or the waveguide component 40a and has sufficient space to configure the wide wall portion 50a. For example, when the frequency of the electromagnetic wave used is in the frequency band of 76 GHz to 81 GHz, the free space wavelength λ0 is approximately 4 mm. In this case, in the WRG, the configuration period T of the rod 30 is generally selected to be a value of about λ0 / 4. As an example, considering the size of the waveguide device, and when the diameter of the fixing component 60 is desired to be 2 mm, the upper end of the wall portion 50a having the through hole 54 has a square of a size of, for example, 4 mm or more. In this case, the length of the side surface 51 of the wall portion 50a facing the waveguide member 40 is 4 mm or more, which is substantially equal to or longer than the free space wavelength λ 0. Thus, the length of the wall portion 50a having the through hole 54 into which the fixing member 60 is inserted in the direction along the waveguide member 40 is determined.

[0162] On the other hand, the length of the side 51 of the wall portion 50 without a through hole opposite to the waveguide component 40 is preferably more than twice the configuration period T of the rod 30 as described in Example 1. However, even if the length of the side 51 is less than λ0 / 2, it has an electromagnetic wave propagation blocking effect. Therefore, the length of the side 51 can also be made less than λ0 / 2 for use. In addition, the length and thickness of the wall portion 50 without a through hole can be freely selected. In the case where a relatively large strength is required, it can be made thicker. In addition, the configuration of the wall portion 50 can be freely selected.

[0163] In WRG, unlike the microstrip line used in the conventional patch antenna (in the microstrip line, the loss when connecting the waveguide between layers is large, so it is limited to a two-dimensional configuration in practical use), a three-dimensional waveguide configuration can be performed. Therefore, it is possible to freely design the position of the multiple waveguide layers constituting the waveguide device to be fixed, and the position of the wall to determine the interval between the first component and the second component. By utilizing this design freedom, the wall can be configured at the most effective position. As described above, by utilizing the waveguide design freedom of WRG, the configuration of the wall can be optimized. As a result, a waveguide device according to the design can be assembled, and a high-performance waveguide device can be realized.

[0164] Example 6

[0165] Fig.18FIG. 2 is a perspective view of the second member 20 and the fixing member 60 in the waveguide device 600 of the sixth embodiment. Fig.18 , a portion of the waveguide device 600 of Example 6 is shown. Fig.18 As shown, in the waveguide device 600 of Example 6, the waveguide component 40a bent into an L shape is bent into a quarter arc shape. A wall portion 50a is provided adjacent to the outer side of the curved portion 43 of the waveguide component 40a. The wall portion 50a has a recessed portion 55 recessed toward the center of the wall portion 50a in a manner corresponding to the curved portion 43 of the waveguide component 40a. The side surface 56 of the recessed portion 55 of the wall portion 50a is opposite to the outer side surface of the curved portion 43 of the waveguide component 40a. That is, no other components such as the rod 30 are arranged between the side surface 56 of the wall portion 50a and the waveguide component 40a. The side surface 56 of the wall portion 50a has a portion bent into a quarter arc shape in a manner along the curved portion 43 of the waveguide component 40a in a quarter arc shape.

[0166] The waveguide formed on the waveguide surface 41 of the waveguide component 40a changes its impedance at the curved portion 43 of the waveguide component 40a that is curved in a quarter arc shape. In the waveguide component 40a, a recess 44 is provided on the upper surface of the curved portion 43 to match the impedance of the straight portion. A plurality of rods 30 are provided on both sides of the waveguide component 40a, except for the area between the side surface 56 of the wall portion 50a and the waveguide component 40a. The rod 30a facing the inner side surface of the curved portion 43 of the waveguide component 40a among the plurality of rods 30 has a shape different from that of the other rods 30. The side surface of the rod 30a facing the waveguide component 40a is curved in a quarter arc shape so as to follow the curved portion 43 of the waveguide component 40a. By arranging the rod 30a on the inner side surface of the curved portion 43 of the waveguide component 40a, the impedance at the curved portion 43 of the quarter arc shape can be adjusted. In addition, by forming the side surface 56 of the wall portion 50 a into a curved shape along the curved portion 43 , it is also possible to adjust the impedance of the electromagnetic wave propagating on the waveguide surface 41 of the waveguide component 40 a .

[0167] In addition, in Example 6, the case where the curved portion 43 of the waveguide component 40a is curved in a quarter arc shape is described as an example, but it may also be curved in other curved shapes such as an elliptical arc shape or a free curve shape.

[0168] [Modifications]

[0169] Fig.19 (a) to Fig.19 (c) is a plan view showing the second member 20 and the fixing member 60 in the waveguide devices 610 to 630 of the modification examples 1 to 3 of the embodiment 6. Fig.19 (a) to Fig.19 In (c), part of the waveguide devices 610 to 630 of Modifications 1 to 3 of Embodiment 6 are also shown. Fig.19 As shown in (a), in the waveguide device 610 of the modification 1 of the embodiment 6, the curved portion 43 of the waveguide component 40a is curved at a right angle when viewed from above, and the outer corner is chamfered, and has a side surface 45 formed by the chamfering. That is, the curved portion 43 is curved in a straight line when viewed from above. The side surface 56 of the recessed portion 55 of the wall portion 50a is Fig.17 Similarly, it is bent into a quarter arc shape when viewed from above. That is, in the modified example 1 of the sixth embodiment, the side surface 56 bent into a curved shape is opposite to the side surface 45 on the outside of the curved portion 43 bent into a straight shape. By providing a recessed portion 44 on the upper surface of the curved portion 43 and a side surface 45 formed by chamfering the curved portion 43, the impedance at the curved portion 43 of the waveguide component 40a is matched with the impedance of the straight portion of the waveguide component 40a. In addition, in the area adjacent to the outer side wall of the wall portion 50a, a rod 30 is provided in a manner surrounding the wall portion 50a. Thus, it is possible to suppress the external leakage of electromagnetic waves leaking from the curved portion 43 of the waveguide component 40a. It may be the case that, as in the modified example 1 of the sixth embodiment, the curved portion 43 of the waveguide component 40a is bent in a straight line, and the side surface 56 of the recessed portion 55 of the wall portion 50a is curved.

[0170] like Fig.19 As shown in (b), in the waveguide device 620 of the second variant of the sixth embodiment, the curved portion 43 of the waveguide component 40a is similar to the first variant of the sixth embodiment, and the outer corner portion that is bent at a right angle when viewed from above is chamfered to form a side surface 45. The side surface 56 of the recessed portion 55 of the wall portion 50a is formed by straight lines in a manner opposite to the curved portion 43 when viewed from above. In addition, similar to the first variant of the sixth embodiment, the rod 30 is provided in a region adjacent to the outer side wall of the wall portion 50a so as to surround the wall portion 50a. It may be the case that the curved portion 43 of the waveguide component 40a is curved in a straight line, the side surface 56 of the recessed portion 55 of the wall portion 50a is straight, and the straight lines are opposite to each other, as in the second variant of the sixth embodiment.

[0171] like Fig.19 As shown in (c), in the waveguide device 630 of the third variant of the sixth embodiment, the curved portion 43 of the waveguide component 40a is curved in a curved shape when viewed from above, similarly to the sixth embodiment. The side surface 56 of the recessed portion 55 of the wall portion 50a is formed by a straight line when viewed from above, similarly to the second variant of the sixth embodiment. In addition, similarly to the first variant of the sixth embodiment, a rod 30 is provided in a region adjacent to the outer side wall of the wall portion 50a so as to surround the wall portion 50a. It may be the case that the curved portion 43 of the waveguide component 40a is curved in a curved shape and the side surface 56 of the recessed portion 55 of the wall portion 50a is straight, as in the third variant of the sixth embodiment.

[0172] According to Embodiment 6 and its variation, the waveguide component 40a includes a curved portion 43 in which the extension direction of the waveguide component 40a changes. The side surface 56 of the wall portion 50a, including a part of the curved portion 43, is adjacent to the waveguide component 40a. In this case, the wall portion 50a can also function as an electric wall to obtain an electromagnetic wave propagation blocking effect. In addition, the shape of the curved portion 43 of the waveguide component 40a and the shape of the side surface 56 of the wall portion 50a can be appropriately changed in order to adjust the impedance.

[0173] In addition, in Embodiment 6 and its variants, it is also possible to Fig. 20 (a) and Fig. 20 As in (b), a gap 80 is formed between the wall portion 50a and the second member 20, or as in Fig. 20 (c) and Fig. 20 As in (d) of the embodiment, a dielectric film 82 is provided between the wall portion 50a and the second member 20. Fig.11 (c) and Fig.11 (d) Similarly, a gap 80 or a dielectric film 82 is provided between the wall portion 50a and the first component 10. Even in these cases, if the reduction in S21 caused by the gap 80 or the dielectric film 82 is within the allowable range in the application, it can be said that the wall portion 50a and the first component 10 or the second component 20 are in a high-frequency coupling state. In addition, Fig. 20 (a) and Fig. 20 (c) is an exploded stereogram. Fig. 20 (b) and Fig. 20 In (d) , the fixing member 60 and the like are omitted for clarity of the drawing.

[0174] Example 7

[0175] Fig.21 FIG. 2 is a plan view of the second component 20 and the fixing component 60 in the waveguide device 700 of Example 7. Fig.21As shown, in the waveguide device 700 of Example 7, the wall portion 50a is arranged adjacent to the inner side of the curved portion 43 of the waveguide component 40a. The through hole 14 adjacent to the front end of the waveguide component 40a is arranged near the wall portion 50a, and therefore, a cutout portion 57 is provided on the wall portion 50a. Thus, two rows of rods 30 are arranged between the through hole 14 and the wall portion 50a, and an electromagnetic wave propagation blocking effect can be obtained. As described above, the wall portion 50a does not need to be square when viewed from above. Any shape can be adopted as needed in consideration of the simulation results during design. The corner of the wall portion 50a opposite to the curved portion 43 of the waveguide component 40a is rounded 58. By making the corner of the wall portion 50a opposite to the curved portion 43 of the waveguide component 40a rounded 58, the impedance of the electromagnetic wave propagating on the waveguide surface 41 of the waveguide component 40a can be adjusted.

[0176] The wall portion 50a may be arranged adjacent to the outer side of the curved portion 43 of the waveguide component 40a as in Example 6 and its modified example, or may be arranged adjacent to the inner side of the curved portion 43 as in Example 7. In either case, the wall portion 50a can function as an electric wall to obtain an electromagnetic wave propagation blocking effect.

[0177] Example 8

[0178] Fig. 22 (a) is a plan view obtained by looking through the second component 20 and the fixing component 60 in the waveguide device 800 of Example 8, Fig. 22 (b) is a plan view obtained by looking through the second component 20 and the fixing component 60 in the waveguide device 810 of the modified example of the eighth embodiment. Fig. 22 (a) and Fig. 22 As shown in (b), the waveguide device 800 of Example 8 and the waveguide device 810 of the modification of Example 8 include a waveguide component 40b having a T-shaped branch portion 46. In this case, the wall portion 50a may be disposed on the head side (outside) of the T-shaped branch portion 46, or may be disposed on one side corner of the T-shaped branch portion 46.

[0179] In the above-mentioned embodiments 1 to 8, the waveguide components 40 to 40b may be part of the second component 20 and may protrude from the conductive surface 21 to the conductive surface 11. In this case, the front end surface of the waveguide components 40 to 40b becomes the waveguide surface 41, and the electromagnetic wave propagates in the gap 42 between the waveguide surface 41 and the conductive surface 11. In addition, the plurality of rods 30 may be as follows: Figure 1 As in (b), the case where the conductive surface 11 is a part of the first component 10 and protrudes from the conductive surface 11 to the conductive surface 21 and has a gap 31 between the conductive surface 21, may also be as follows Fig.23In this case, the waveguide members 40 to 40b are part of the second member 20 and protrude from the conductive surface 21 to the conductive surface 11, and there is a gap 31 between the waveguide members 40 to 40b and the rod 30. In order to make the interval between the waveguide members 40 to 40b and the rod 30 of an appropriate size, when the waveguide members 40 to 40b are part of the first member 10 and protrude from the conductive surface 11 to the conductive surface 21, the rod 30 is also preferably a part of the first member 10 and protrudes from the conductive surface 11 to the conductive surface 21. When the waveguide members 40 to 40b are part of the second member 20 and protrude from the conductive surface 21 to the conductive surface 11, the rod 30 is also preferably a part of the second member 20 and protrudes from the conductive surface 21 to the conductive surface 11.

[0180] Although the embodiments of the present invention have been described in detail above, the present invention is not limited to these specific embodiments, and various modifications and changes can be made within the scope of the gist of the present invention described in the claims.

[0181] Description of Reference Numerals

[0182] 10 first component, 11 conductive surface, 13 through hole, 20 second component, 21 conductive surface, 23 through hole, 30, 30a rod, 31 gap, 40, 40a, 40b waveguide component, 41 waveguide surface, 42 gap, 43 bent portion, 44 recessed portion, 45 side surface, 46 branch portion, 50, 50a wall portion, 51, 51a, 51b side surface, 52 upper end, 53 lower end, 54 through hole, 55 recessed portion, 56 side surface, 57 cutout portion, 58 fillet, 59 recess, 60 fixing component, 63 fixing component, 61 shaft portion, 62 umbrella portion, 70, 70a groove, 72, 72a column portion, 80 gap, 82 dielectric film, 100, 110, 120, 200, 300, 400, 410, 420, 500, 600, 610, 620, 630, 700, 800, 810, 1000 waveguide device.

Claims

1. A waveguide device, characterized in that: include: a first component having a conductive first surface; a second component having a conductive second surface opposite to the first surface; a waveguide member, which is provided between the first surface and the second surface so as to extend in the surface direction of the first surface, is in contact with the first surface and forms a first gap between the first surface and the second surface, and has a conductive waveguide surface facing the second surface; a plurality of rods disposed around the waveguide member between the first surface and the second surface, contacting one of the first surface and the second surface and extending toward the other surface, forming a second gap between the other surface and the rods, and having a conductive surface; and A wall portion is disposed between the first surface and the second surface, in contact with or high-frequency coupled with the first surface and the second surface and adjacent to the waveguide component without being separated by the plurality of rods, and at least the side opposite to the waveguide component has conductivity.

2. The waveguide device according to claim 1, characterized in that: A length of the wall portion along the waveguide member in the plane direction is greater than a distance between the first surface and the second surface at a position of the wall portion.

3. The waveguide device according to claim 1 or 2, characterized in that: The plurality of rods are in contact with the first surface and extend toward the second surface, and the second gaps are formed between the rods and the second surface.

4. The waveguide device according to claim 1 or 2, characterized in that: The side surface of the wall portion extends along the waveguide member.

5. The waveguide device according to claim 1 or 2, characterized in that: The side surface of the wall portion is adjacent to the straight portion of the waveguide member.

6. The waveguide device according to claim 1 or 2, characterized in that: The waveguide component includes a curved portion in which an extending direction of the waveguide component changes, The side surface of the wall portion, including a portion of the bent portion, is adjacent to the waveguide component.

7. The waveguide device according to claim 5, characterized in that: Parts of the plurality of rods are provided on both sides of the wall portion in the direction in which the waveguide member extends.

8. The waveguide device according to claim 1 or 2, characterized in that: A part of the plurality of rods is provided adjacent to the waveguide member on the opposite side of the wall portion across the waveguide member.

9. The waveguide device according to claim 1 or 2, characterized in that: A fixing member for fixing the second member to the wall is included.

10. The waveguide device according to claim 9, characterized in that: The upper surface of the wall portion has a through hole or a recessed portion, The second member can be fixed to the wall portion by inserting the fixing member into the through hole or the recessed portion.

11. The waveguide device according to claim 10, characterized in that: The wall portion has a groove on the upper surface, which is located between the through hole or the recess and the waveguide component and along the extending direction of the waveguide component. When the free space wavelength of the center frequency of the used frequency band is assumed to be λ0, the depth of the groove is within the range of λ0 / 4±λ0 / 8.

12. The waveguide device according to claim 11, characterized in that: The groove is provided so as to surround the through hole or the recess.

13. The waveguide device according to claim 1 or 2, characterized in that: When the free space wavelength of the center frequency of the used frequency band is λ0, the length of the wall portion along the waveguide member in the plane direction is greater than λ0 / 2.

14. The waveguide device according to claim 1 or 2, characterized in that: The wall portion defines a distance between the first component and the second component.

15. The waveguide device according to claim 1 or 2, characterized in that: A dielectric film is provided between at least one of the first surface and the second surface and the wall portion.

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