Conveying device

Abstract

A transmission device for transmitting electromagnetic waves is provided with: a first transmission member (10) in which a first transmission path (11) is formed; and a second conveying member (20) in which a second conveying path (21) is formed. The first conveying path (11) is a passage opened on one surface (10a) of the first conveying component; the first conveying member (10) and the second conveying member (20) are disposed with a gap therebetween such that the second conveying path (21) faces the one surface (10a). The first transport member (10) has formed therein a recess (12) that opens at a position on one surface (10a) that is separated from the first transport path (11).

Description

Technical Field

[0001] The present disclosure relates to a delivery device. Background Art

[0002] In a transmission device that transmits electromagnetic waves between an IC (integrated circuit) substrate, an antenna, etc., a waveguide having a transmission path formed therein is used in combination with the substrate, etc. If a gap is generated between the substrate, etc. and the waveguide due to warping that occurs during the manufacture of the substrate, etc., the transmission loss may increase due to the leakage electric field from the gap. For example, in Patent Document 1, the following technology is proposed: a periodic structure is provided around the waveguide, and the components around the waveguide are operated as a metamaterial, thereby reducing the leakage electric field.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: U.S. Patent Application Publication No. 2021 / 0376439 Summary of the invention

[0006] However, according to the research conducted by the inventors of the present application, it has been found that in a transmission device having such a structure, a transmission loss that affects radar characteristics occurs in a high frequency band such as 77 GHz used by millimeter wave radars and the like.

[0007] In view of the above-mentioned problems, an object of the present disclosure is to provide a transmission device capable of reducing transmission loss.

[0008] In order to achieve the above-mentioned purpose, according to a technical solution of the present disclosure, a transmission device for transmitting electromagnetic waves comprises: a first transmission component, which forms a first transmission path; and a second transmission component, which forms a second transmission path; the first transmission path is a passage opening on one side of the first transmission component; the first transmission component and the second transmission component are configured so that a gap is provided in a manner that the second transmission path is opposite to one side; and a recessed portion opening at a position away from the first transmission path in one side is formed in the first transmission component.

[0009] Thus, the leakage electric field from the gap between the first transmission member and the second transmission member can be offset by the reflected electric field from the recessed portion, thereby reducing the transmission loss. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a perspective view of the conveying device according to the first embodiment.

[0011] Figure 2 It is a cross-sectional view of the conveying device according to the first embodiment.

[0012] Figure 3It is a top view of the first conveying member.

[0013] Figure 4 It is a diagram for explaining the reduction of the leakage electric field due to the recessed portion.

[0014] Figure 5 It is a diagram for explaining the reduction of the leakage electric field due to the recessed portion.

[0015] Figure 6 It is a diagram showing the distribution of the leakage electric field.

[0016] Figure 7 This is a diagram showing the relationship between the position in the longitudinal direction of the first transmission path and the electric field.

[0017] Figure 8 This is a diagram showing the relationship between the width of the concave portion and the transmission loss.

[0018] Fig. 9 This is a diagram showing the relationship between the depth of the concave portion and the transmission loss.

[0019] Fig.10 This is a diagram showing the difference between the isophase surface of the leakage electric field when the opening shape of the recessed portion is made linear and the shape of the recessed portion.

[0020] Fig.11 It is a diagram showing the curvature of the isophase surface of the leakage electric field.

[0021] Fig.12 This is a diagram for comparing the isophase surface of the leakage electric field with the shape of concentric circles centered on the center of the first transmission path.

[0022] Fig.13 It means to make Fig.12 A diagram showing the situation where the centers of the concentric circles are offset.

[0023] Fig.14 This is a diagram showing a state in which the center of the recess is shifted to the opposite side of the recess with respect to the first conveying path.

[0024] Fig.15 This is a diagram for comparing the isophase surface of the leakage electric field with the shape of an ellipse centered on the center of the first transmission path.

[0025] Fig.16 It is a graph showing the relationship between the central angle of the concave portion and the transmission loss.

[0026] Fig.17 This is a graph showing the relationship between the frequency of electromagnetic waves and the transmission loss.

[0027] Fig.18 It is a top view of the first conveying member according to the second embodiment.

[0028] Fig.19 It is a cross-sectional view of a conveying device according to a third embodiment.

[0029] Fig. 20 It is a cross-sectional view of a conveying device according to a fourth embodiment.

[0030] Fig.21 It is a cross-sectional view of the conveying device according to the fifth embodiment.

[0031] Fig. 22 It is a cross-sectional view of a conveying device according to a sixth embodiment.

[0032] Fig.23 It is a top view of the first conveying member according to another embodiment.

[0033] Fig.24 It is a top view of the first conveying member according to another embodiment.

[0034] Fig.25 It is a top view of the first conveying member according to another embodiment.

[0035] Fig.26 It is a top view of the first conveying member according to another embodiment.

[0036] Fig. 27 It is a top view of the first conveying member according to another embodiment.

[0037] Fig.28 It is a top view of the first conveying member according to another embodiment.

[0038] Fig.29 It is a cross-sectional view of a conveying device according to another embodiment. DETAILED DESCRIPTION

[0039] Hereinafter, embodiments of the present disclosure will be described based on the drawings.

[0040] In the following embodiments, the same or equivalent parts are described with the same reference numerals.

[0041] (First embodiment)

[0042] A first embodiment will be described. The transmission device of this embodiment is a device that transmits electromagnetic waves, and is used, for example, to transmit electromagnetic waves between an antenna of an in-vehicle radar and an IC substrate.

[0043] like Figure 1 , Figure 2As shown, the transmission device includes a first transmission member 10 and a second transmission member 20. The first transmission member 10 and the second transmission member 20 are formed as waveguides. The first transmission member 10 has a first transmission path 11, and the second transmission member 20 has a second transmission path 21.

[0044] The first conveying member 10 is a metal member in the shape of a quadrangular column having one surface 10a and another surface 10b on the opposite side of the one surface 10a. Two directions parallel to the one surface 10a and perpendicular to each other are respectively defined as the x direction and the y direction, and a direction perpendicular to both the x direction and the y direction, i.e., a normal direction of the one surface 10a, is defined as the z direction. The first conveying path 11 is extended in the z direction and is opened on the one surface 10a and the other surface 10b, and serves as a passage connecting the one surface 10a and the other surface 10b.

[0045] The second conveying member 20 is a metal member in the shape of a quadrangular column having one surface 20a and another surface 20b opposite to the one surface 20a. The second conveying member 20 is arranged so that the one surface 20a and the other surface 20b are parallel to the one surface 10a and the other surface 10b. The second conveying path 21 is extended in the z direction and opens on the one surface 20a and the other surface 20b, and serves as a passage connecting the one surface 20a and the other surface 20b.

[0046] The first conveying member 10 and the second conveying member 20 are connected in such a manner that the opening of the second conveying path 21 on the other surface 20b faces the opening of the first conveying path 11 on the one surface 10a. A gap S is formed between the first conveying member 10 and the second conveying member 20. The gap S is generated, for example, by warping of the first conveying member 10 or the second conveying member 20.

[0047] The opening shapes of the first transmission path 11 on one side 10a and the other side 10b and the opening shapes of the second transmission path 21 on one side 20a and the other side 20b are configured to transmit electromagnetic waves of a frequency band of a fundamental mode. The fundamental mode is a mode with the lowest cutoff frequency in the form of electromagnetic wave distribution in the first transmission component 10 and the second transmission component 20, such as a TE01 mode.

[0048] Specifically, the opening shape of the first transmission path 11 is parallel to the surface 10a and has a long side direction and a short side direction that are perpendicular to each other. In this embodiment, the opening shape of the first transmission path 11 is a rectangle with the x direction as the long side direction and the y direction as the short side direction. Figure 3 As shown, the center of the rectangle in the xy plane constituting the opening shape of the first conveying path 11 is P1. The opening shape of the second conveying path 21 is a rectangle with the x direction as the long side direction and the y direction as the short side direction.

[0049] The path cross section of the first transport path 11 parallel to the xy plane is the same shape as the opening shape on the one surface 10a and the other surface 10b. The path cross section of the second transport path 21 parallel to the xy plane is the same shape as the opening shape on the one surface 20a and the other surface 20b.

[0050] The first transport member 10 has a recess 12 that opens at a position away from the first transport path 11 on one surface 10a. The recess 12 serves to reduce a leakage electric field from the gap S.

[0051] The concave portion 12 is formed one on each side of the first conveying path 11 in the y direction. Figure 3 As shown in the figure, the concave portion 12 formed on one side and the other side of the first conveying path 11 in the y direction is respectively set as a concave portion 12a and a concave portion 12b. The concave portions 12a and 12b are respectively symmetrically shaped with respect to a straight line L1 passing through the center P1 and parallel to the y direction. In addition, the concave portions 12a and 12b are arranged in a symmetrical manner with respect to a straight line L2 passing through the center P1 and parallel to the x direction.

[0052] The recesses 12a and 12b are opened in arc shape on one surface 10a. The arc constituting the opening shape of the recesses 12a and 12b is L3, and the center of the arc L3 is P2. The center P2 is located at a different position from the center P1 on the straight line L1.

[0053] like Figure 2 , Figure 3 As shown, the widths of the first conveying path 11 in the x direction and the y direction are set to a and b respectively. The width of the recess 12 in the x direction is set to L. The width in the direction perpendicular to the arc L3 of the recess 12 and the z direction is set to w. The depth of the recess 12 in the z direction is set to d. The width w and the depth d are set to be larger than the specified value and designed in a manner that is constant in the entire recess 12, but there may be deviations due to processing accuracy, and the corners may have roundness. Let the distance between the center P1 and the center P2 be db. Let the radius of the arc L3 be r. Let the central angle of the arc L3 be θ. Let the width of the gap S in the z direction be δ. Let the length in the z direction from the other surface 10b to the one surface 20a be Lw. Let the widths of the first conveying member 10 in the x direction and the y direction be aw and bw respectively. The widths of the second conveying member 20 in the x direction and the y direction are set to be the same as those of the first conveying member 10. The widths of the second transport path 21 in the x direction and the y direction are set to be the same as those of the first transport path 11 .

[0054] The principle of reducing the leakage electric field by the recess 12 is described below. Figure 4If it is transmitted as shown by the arrow A1, the electric field leaks and diffuses from the first transmission path 11 to the outside of the transmission device through the gap S as shown by the arrow A2. However, a part of this electric field enters the inside of the recess 12 as shown by the arrow A3 and is reflected at the bottom of the recess 12. A part of the electric field reflected by the recess 12 returns to the first transmission path 11 as shown by the arrow A4, and the other part goes toward the outside of the transmission device as shown by the arrow A5.

[0055] And, by appropriately setting the width and depth of the recess 12, the leaking electric field represented by the arrow A2 and the reflected electric field represented by the arrow A4 resonate between the first transmission path 11 and the recess 12. In addition, in the part opposite to the recess 12 with respect to the first transmission path 11, the leaking electric field represented by the arrow A2 and the reflected electric field represented by the arrow A5 cancel each other out. Thus, as Figure 5 shown, the gap S is blocked by the wall, and an electric field distribution close to the state where the recess is formed on the wall is obtained. In this way, the leaking electric field from the gap S can be reduced.

[0056] As Figure 6 shown, the leaking electric field from the first transmission path 11 is distributed in such a way that an equiphase surface expands concentrically from the centers of the two long sides of the rectangle forming the opening shape of the first transmission path 11. And this leaking electric field takes a maximum value on the straight line L1 and a minimum value on the straight line L2. Therefore, by setting a < L so that the long side periphery of the rectangle is covered by the recess 12 and arranging the recess 12 on both sides in the y direction with respect to the first transmission path 11, the leaking electric field can be effectively reduced.

[0057] If the electric field inside the first transmission path 11 is set to E, the electric field E is as Figure 7 shown, and takes a maximum value E at the center in the x direction 0 . In addition, the electric field E has a distribution symmetric with respect to the straight line L1 and becomes smaller as it approaches the two end portions in the x direction of the first transmission path 11. Corresponding to such an electric field distribution, it is preferable to set the width L so that the shape of the recess 12 is line-symmetric with respect to the straight line L1. In addition, it is preferable that the width L is set to cover more than half of the leaking electric field.

[0058] A method for estimating the leaking electric field based on the electric field distribution inside the first transmission path 11 and setting the arrangement range of the recess 12 will be described. The electric field intensity E in the TE01 mode is as shown in Equation 1.

[0059] [Equation 1]

[0060]

[0061] Therefore, the total power A of the transmission device total is represented by Equation 2.

[0062] [Formula 2]

[0063]

[0064] The power A in the range of width L symmetrical to the straight line L1 L It is expressed by formula 3.

[0065] [Formula 3]

[0066]

[0067] Near the first transmission path 11, the width L prevents the total power A total Equivalent to power A L The radio wave leakage can be regarded as passing through the coupling part, so the transmission loss A loss It is expressed by formula 4.

[0068] [Formula 4]

[0069]

[0070] That is, through the loss A loss It changes according to the ratio L / a of the width a to the width L.

[0071] Figure 8 It is the transmission loss A when L / a is changed loss Theoretical value. Figure 8 It can be seen that, for example, if we want to reduce the transmission loss to A loss If it is less than -0.1 dB, L / a=0.75 is required, that is, the width L is larger than 75% of the width a. For example, when the first transmission member 10 is formed of a WR-12 waveguide, a=3.1 mm, so the width L of the recess 12 needs to be 2.325 mm.

[0072] The width w and depth d of the concave portion 12 are described below. The wavelength of the electromagnetic wave transmitted by the first transmission path 11 is λ and the frequency is f. The transmission loss of the transmission device is A loss The inventors of the present application set f = 76.5 GHz, varied the width w and the depth d, and conducted simulations to investigate the transmission loss A. loss . Fig. 9 This is the analytical result obtained through the simulation. Fig. 9 The analysis results from d = 0 to d / λ = 1.25, i.e., to the range of d = 1.25λ≈5mm are shown in FIG. Fig. 9, the analysis results for the cases where w=0.2 mm, 0.12 mm, 0.8 mm, 1.2 mm, and 1.5 mm, that is, the cases where w=0.051λ, 0.1275λ, 0.204λ, 0.306λ, and 0.3825λ are shown.

[0073] If N is set to an integer greater than 0, then Fig. 9 As shown in the figure, when the depth d is approximately λ / 4+N·λ / 2, the transmission loss A loss In addition, when the depth d is N·λ / 2, the transmission loss A loss This is reasonable in principle based on the periodicity of electromagnetic waves. However, since the performance is slightly improved by increasing the width w, it is not necessarily the case that the transmission loss A is d = λ / 4 + N·λ / 2. loss Taking the width w into consideration, the transmission loss A can be reduced by setting the depth d to be greater than λ / 4+N·λ / 2 and less than (N+1)λ / 2. loss The depth d may be out of this range. For example, when the structure needs to be minimized according to processing constraints, d=0.2λ or d≈0.2λ may be used.

[0074] The opening shape of the recess 12 is described below. With respect to the above-mentioned distribution of the leakage electric field, for example, when Fig.10 When the recess 12 is extended in a straight line parallel to the x direction as shown, the angle between the isophase plane of the electric field and the extending direction of the recess 12 becomes larger at a position away from the straight line L1 such as the region R1. As a result, the deviation between the phase of the reflected electric field and the phase that can effectively cancel the leakage electric field becomes larger, and the leakage electric field suppression performance may be reduced.

[0075] On the other hand, by making the opening shape of the recess 12 into an arc shape as in the present embodiment, the opening shape of the recess 12 becomes a shape along the electric field distribution, and the leakage electric field suppression performance can be improved.

[0076] The curvature of the arc L3 is described. It is preferred that the curvature of the arc L3 be set in a manner that follows the distribution shape of equal power of the leakage electric field. Here, equal power is synonymous with equal phase when material and spatial attenuation are not assumed. The equal phase surface of the leakage electric field is as follows: Fig.11 As shown by the dotted lines L4, L5, and L6, near the first transmission path 11, the curvature becomes larger due to the influence of the corners and straight edges of the first transmission path 11. In addition, the curvature of the isophase surface becomes smaller as it moves away from the first transmission path 11, and converges to a perfect circle with the center P1 as the center. The curvature of the concave portion 12 is preferably set in consideration of this situation.

[0077] For example, when the device is housed in an integrated circuit such as a radar, it is preferable to miniaturize the size of the transmission device, so the recess 12 is arranged near the long side of the first transmission path 11. In this case, it is preferable to increase the curvature of the arc L3. On the other hand, when the recess 12 is formed at a position far away from the first transmission path 11, it is preferable to reduce the curvature of the arc L3.

[0078] The position of the center P2 will be described. Fig.12 The dotted lines L7 to L15 are concentric circles centered at the center P1. Near the first transmission path 11, since the difference between the isophase plane of the leakage electric field and the shape of the concentric circle becomes larger, if the center P2 is made consistent with the center P1, the difference between the isophase plane of the leakage electric field and the shape of the concave portion 12 becomes larger, and the leakage electric field suppression performance may be reduced. For example, Fig.12 In the region R2 near the first transmission path 11 or in the region R3 farther from the first transmission path 11 and the straight line L1 than the region R2, the difference between the shape of the isophase surface and the shape of the concave portion 12 becomes large.

[0079] On the other hand, if Fig.13 As shown, if the center of the concentric circle is moved from the center P1 in the y direction, the difference between the shape of the isophase plane of the electric field and the concentric circle becomes smaller. Fig.13 The electric field distribution is shown when the first transmission member 10 is formed of a WR-12 waveguide of the EIA standard and the center P2 is offset from the center P1 by 0.6 mm in the y direction to form the concave portion 12. Fig.13 In the region R4 away from the straight line L1, the difference between the isophase plane and the shape of the recess 12 becomes smaller. In this way, by placing the center P2 at a position different from the center P1, the difference between the isophase plane of the leakage electric field and the shape of the recess 12 becomes smaller, and the leakage electric field suppression performance can be further improved.

[0080] In addition, if the distance db between the center P1 and the center P2 is too large, the concave portion 12 does not have a shape that covers the corner of the first transmission path 11, and the leakage electric field suppression performance may be reduced, so it is preferable to reduce the distance db to some extent. For example, when the first transmission member 10 is composed of a WR-12 waveguide and the frequency f is 60 GHz to 90 GHz, it is preferable to make the distance db 0.6 mm to 1.0 mm, that is, within ±0.2 mm in the y direction relative to the center of the long side of the first transmission path 11.

[0081] However, the center P2 is not limited to this when it is offset in the direction opposite to the concave portion 12 relative to the center P1. Fig.14As shown, the distance db can be increased when the center P2 of the arc L3 of the recess 12a is placed on the same side as the recess 12b relative to the first transmission path 11. For example, when the first transmission member 10 is composed of a WR-12 waveguide as described above, the distance db can be made larger than 1.0 mm.

[0082] Furthermore, when the center P2 is made to coincide with the center P1, the opening shape of the recess 12 can be made into an elliptical arc shape, so that the recess 12 can be made into a shape along the isophase surface of the leakage electric field, and the leakage electric field suppression performance can be further improved. Fig.15 In FIG. 1 , a plurality of ellipses with different lengths of axes in the x direction are indicated by dotted lines with the center P1 as the center. By forming the recess 12 along the ellipse indicated by the dotted line L16 among the plurality of ellipses, the opening shape of the recess 12 can be made into a shape along the isophase surface of the leakage electric field.

[0083] exist Fig.16 The center angle θ and the transmission loss A are shown in FIG. 1 when the center P2 is shifted to the long side of the first transmission path 11 and the radius r is set to a / 2. loss According to Fig.16 It can be seen that, for example, if we want to reduce the transmission loss to A loss When the value is less than -0.1 dB, the central angle θ needs to be approximately 150° or more.

[0084] Fig.17 The frequency f and the transmission loss A were investigated. loss In this simulation, the dimensions of the first conveying member 10 and the second conveying member 20 are set as follows. That is, Lw = 7 mm, aw = 6 mm, bw = 6 mm, a = 3.1 mm, b = 1.55 mm, δ = 0.1 mm, d = 1.4 mm, w = 0.8 mm, r = 1.55 mm, θ = 150°, db = 0.8 mm. In addition, Fig.17 The solid line and the dotted line are simulation results when the opening shape of the recessed portion 12 is set to an arc shape and a straight line shape, respectively.

[0085] like Fig.17 As shown, in the high frequency band used by millimeter wave radar, specifically, in the range of 65 GHz to 90 GHz, the transmission loss A can be reduced to loss In addition, by making the opening shape of the concave portion 12 arc-shaped, the transmission loss A can be reduced compared to the case where the opening shape is linear. loss .

[0086] As described above, in this embodiment, since the first transmission member 10 is provided with the recessed portion 12 opened at a position away from the first transmission path 11 in one surface 10a, the leakage electric field from the gap S can be offset by the reflected electric field from the recessed portion 12, thereby reducing the transmission loss. For example, when the transmission device of this embodiment transmits electromagnetic waves between a substrate and an antenna, the power of the substrate can be supplied to the antenna with low loss.

[0087] In this embodiment, the transmission loss can be reduced simply by forming the recess 12 in the first conveying member 10, and complicated processing of the first conveying member 10 is not required, so the conveying device can be easily manufactured. In addition, the size of the first conveying member 10 can be suppressed.

[0088] Furthermore, according to the above-described embodiment, the following effects can be obtained.

[0089] The first transmission path 11 is configured to transmit electromagnetic waves in a fundamental mode, thereby enabling efficient electromagnetic wave transmission based on the fundamental mode.

[0090] The recessed portion 12 is formed along an isophase plane of an electric field extending around the first transmission path 11. This can effectively cancel out a leakage electric field.

[0091] The recessed portion 12 is formed on both sides of the first transmission path 11. Thus, compared with the case where the recessed portion 12 is formed only on one side of the first transmission path 11, the leakage electric field can be largely offset.

[0092] The depth d is set to be greater than λ / 4+N·λ / 2 and less than (N+1)λ / 2. Thus, the leakage electric field can be effectively offset by the reflected electric field from the recess 12. For example, when the depth d is set to λ / 4+N·λ / 2, the time required to form the recess 12 can be shortened and the leakage electric field can be effectively offset.

[0093] The opening shape of the first transmission path 11 on one surface 10a is formed into a shape having a long side direction and a short side direction perpendicular to each other, and the opening shape of the recessed portion 12 on one surface 10a is formed into a shape symmetrical with respect to a straight line L1 passing through the center P1 and parallel to the short side direction. As a result, the difference between the isophase plane of the leakage electric field and the shape of the recessed portion 12 is reduced, and the leakage electric field suppression performance can be further improved.

[0094] The opening shape of the concave portion 12 on one surface 10a is formed into an arc shape. Thus, the concave portion 12 has a shape along the distribution of the leakage electric field, and the leakage electric field suppression performance can be improved.

[0095] The opening shape of the first transmission path 11 on one surface 10a is formed into a shape having a long side direction and a short side direction perpendicular to each other, and the center P2 of the arc L3 is arranged on the straight line L1 passing through the center P1 and parallel to the short side direction. By arranging the center P2 in this way, the width L is set so that the shape of the concave portion 12 is line-symmetrical with respect to the straight line L1, thereby reducing the difference between the isophase surface of the leakage electric field and the shape of the concave portion 12, and the leakage electric field suppression performance can be further improved.

[0096] The center P2 is located at a position different from the center P1. This reduces the difference between the isophase plane of the leakage electric field and the shape of the recessed portion 12, and can further improve the leakage electric field suppression performance.

[0097] (Second embodiment)

[0098] The second embodiment is described below. This embodiment is obtained by changing the number of recessed portions 12 compared to the first embodiment. The other aspects are the same as the first embodiment, so only the differences from the first embodiment will be described below.

[0099] In the present embodiment, a plurality of recesses 12 are formed on one side and the other side of the first conveying path 11 in the y direction. Furthermore, the plurality of recesses 12 formed on one side of the first conveying path 11 in the y direction are set to have a larger width in the x direction as the recesses 12 are farther from the center P1. Similarly, the plurality of recesses 12 formed on the other side of the first conveying path 11 in the y direction are set to have a larger width in the x direction as the recesses 12 are farther from the center P1.

[0100] Specifically, if Fig.18 As shown in the figure, a concave portion 12a and a concave portion 12c opened at a position farther from the first conveying path 11 than the concave portion 12a are formed on one side of the first conveying path 11 in the y direction. In addition, a concave portion 12b and a concave portion 12d opened at a position farther from the first conveying path 11 than the concave portion 12b are formed on one side of the first conveying path 11 in the y direction. That is, two concave portions 12 are formed on both sides of the first conveying path 11 in the y direction.

[0101] Furthermore, the width of the recess 12c in the x direction is set larger than that of the recess 12a, and the recess 12c is opened in an arc shape so as to cover the recess 12a from one side in the y direction. In addition, the width of the recess 12d in the x direction is set larger than that of the recess 12b, and the recess 12d is opened in an arc shape so as to cover the recess 12b from the other side in the y direction.

[0102] This embodiment can obtain the same effects as those of the first embodiment through the same structure and operation as those of the first embodiment.

[0103] Furthermore, according to the above-described embodiment, the following effects can be obtained.

[0104] A plurality of recesses 12 are formed on one side of the first transmission path 11, and the width of the recesses 12 is set larger as the distance from the center P1 increases. This covers the electric field extending in a concentric circle shape, and can effectively reduce the leakage electric field.

[0105] (Third embodiment)

[0106] The third embodiment is described below. This embodiment is obtained by changing the structure of the second transport member 20 compared to the first embodiment. The rest is the same as the first embodiment, so only the parts different from the first embodiment will be described below.

[0107] like Fig.19 As shown, the second conveying member 20 of this embodiment is formed with a recess 22. The recess 22 is formed in the same structure as the recess 12. That is, one recess 22 is formed on each side of the second conveying path 21 in the y direction, and opens in an arc shape at a position away from the second conveying path 21 in the other surface 20b. In addition, the two recesses 22 are formed in a line-symmetrical shape with respect to a straight line passing through the center of the second conveying path 21 and parallel to the y direction. In addition, the two recesses 22 are arranged in a line-symmetrical manner with respect to a straight line passing through the center of the second conveying path 21 and parallel to the x direction.

[0108] By forming the recessed portion 22 in the second transmission member 20 , the leakage electric field from the gap S is offset by the reflected electric field in the recessed portion 22 , so that the transmission loss can be further reduced.

[0109] This embodiment can obtain the same effects as those of the first embodiment through the same structure and operation as those of the first embodiment.

[0110] (Fourth embodiment)

[0111] The fourth embodiment is described below. This embodiment is obtained by changing the structure of the second transport member 20 compared to the first embodiment. The rest is the same as the first embodiment, so only the parts different from the first embodiment will be described below.

[0112] like Fig. 20As shown, the second transmission member 20 of this embodiment is composed of a substrate. The substrate is a dielectric substrate on which an RF (Radio Frequency) circuit used in wireless devices such as radar and communication equipment is formed, and the second transmission path 21 is formed as a microstrip line formed on the substrate. In addition, as the architecture of the RF circuit of the wireless device, there are BGA (Ball Grid Array), LiP (Launcher In Package), etc., but this embodiment can be applied to any of them.

[0113] This embodiment can obtain the same effects as those of the first embodiment through the same structure and operation as those of the first embodiment.

[0114] (Fifth embodiment)

[0115] The fifth embodiment is described below. This embodiment is obtained by changing the structure of the second transport member 20 compared to the first embodiment. The rest is the same as the first embodiment, so only the parts different from the first embodiment will be described below.

[0116] like Fig.21 As shown, the second transmission member 20 of this embodiment is formed as an antenna. For example, the second transmission member 20 is formed as a horn antenna, and the passage formed inside the member of the square truncated cone shape is used as the second transmission path 21.

[0117] This embodiment can obtain the same effects as those of the first embodiment through the same structure and operation as those of the first embodiment.

[0118] (Sixth Implementation Method)

[0119] The sixth embodiment is described below. This embodiment is obtained by changing the structure of the first conveying member 10 compared to the first embodiment. The rest is the same as the first embodiment, so only the parts different from the first embodiment will be described below.

[0120] like Fig. 22 As shown, the first conveying member 10 of this embodiment is composed of a quadrangular column-shaped main body 13 and a connecting portion 14 connected to the second conveying member 20, and the recess 12 is formed in the connecting portion 14. In this embodiment, the surface of the connecting portion 14 facing the second conveying member 20 is defined as one surface 10a, and the first conveying path 11 is composed of a portion penetrating the main body 13 and a portion penetrating the connecting portion 14.

[0121] In addition, Fig. 22 In the embodiment, the recess 12 penetrates the connection portion 14 , and the bottom surface of the recess 12 is formed by the surface of the main body 13 . However, the recess 12 may be formed to a depth reaching the middle of the connection portion 14 .

[0122] Even when the portion of the surface of the main body 13 facing the second conveying member 20 that is away from the first conveying path 11 is made flat, the leakage electric field can be reduced by attaching the connecting portion 14 having the recessed portion 12 .

[0123] This embodiment can obtain the same effects as those of the first embodiment through the same structure and operation as those of the first embodiment.

[0124] (Other embodiments)

[0125] In addition, the present disclosure is not limited to the above-mentioned embodiments, but can be appropriately changed. In addition, the above-mentioned embodiments are not independent of each other, and can be appropriately combined except for the case that they are obviously not combined. In addition, in the above-mentioned embodiments, the elements constituting the embodiments are not necessarily necessary, except for the cases that are specifically indicated as necessary and the cases that are obviously considered to be necessary in principle. In addition, in the above-mentioned embodiments, when referring to the numerical values ​​of the number, value, amount, range, etc. of the constituent elements of the embodiments, except for the cases that are specifically indicated as necessary and the cases that are obviously limited to a specific number in principle, it is not limited to the specific number. In addition, in the above-mentioned embodiments, when referring to the shape, positional relationship, etc. of the constituent elements, etc., except for the cases that are specifically indicated and the cases that are limited to a specific shape, positional relationship, etc. in principle, it is not limited to the shape, positional relationship, etc.

[0126] The opening shape of the first transmission path 11 may be made into a shape different from that of the first embodiment. Fig.23 As shown in FIG. 1 , the opening shape of the first transmission path 11 is made into a rectangular shape with rounded corners. Fig.24 As shown in the embodiment, the opening shape of the first conveying path 11 is formed into an H shape consisting of a rectangle extending in the x direction and rectangles extending from both ends of the rectangle to both sides in the y direction. In addition, the opening shape of the second conveying path 21 may be formed into a shape different from that of the first embodiment. For example, the opening shape of the second conveying path 21 may be formed into a shape different from that of the first embodiment. Fig.23 , Fig.24 The opening shape of the first conveying path 11 shown is the same shape.

[0127] The recess 12 may have an opening shape different from that of the first embodiment. For example, the opening shape of the recess 12 may be a straight line. Even if the opening shape of the recess 12 is a straight line, the width w, depth d, width L, etc. may be appropriately set to match the first embodiment. Fig.17 The results shown are compared to the permeation loss A loss Reduce to less than 0.1dB. Fig.25 As shown in FIG. 1 , the opening shape of the recess 12 is L-shaped. Fig.26 As shown in FIG. 1 , the opening shape of the concave portion 12 is made into a U-shape. In addition, the end of the opening shape of the concave portion 12 may be curved. In addition, a concave-convex shape may be formed at the end of the opening shape of the concave portion 12. In addition, the ends of the opening shapes of the two concave portions 12 may be connected to each other. For example, Fig. 27 As shown in FIG. 1 , the opening shape of the recess 12 is circular. Fig.28 In the example shown, the opening of the recess 12 is in the shape of a rectangular frame.

[0128] The recess 12 may be formed only on one side in the y direction with respect to the first conveying path 11. In the second embodiment, two recesses 12 are formed on both sides of the first conveying path 11, but three or more recesses 12 may be formed on both sides or one side of the first conveying path 11.

[0129] In the third to sixth embodiments, a plurality of recesses 12 may be formed on both sides of the first conveying path 11, similarly to the second embodiment. Fig.29 As shown, in the fourth embodiment, the recess 22 may be formed in the same manner as in the third embodiment. In the fifth and sixth embodiments, the recess 22 may be formed in the same manner as in the third embodiment. In the sixth embodiment, the second transmission member 20 may be formed as a substrate in the same manner as in the fourth embodiment. In the sixth embodiment, the second transmission member 20 may be formed as an antenna in the same manner as in the fifth embodiment.

Claims

1. A transmission device for transmitting electromagnetic waves, have: a first conveying member having a first conveying path formed therein; and The second conveying member is formed with a second conveying path, The first conveying path is formed as a passage opening on one side of the first conveying member. The first conveying member and the second conveying member are arranged with a gap provided therebetween in such a manner that the second conveying path faces the one surface. The first transport member has a recessed portion opened at a position of the one surface away from the first transport path.

2. The conveying device according to claim 1, The first transmission path is configured to transmit a fundamental mode electromagnetic wave.

3. The conveying device according to claim 1, The recessed portion is formed along an isophase surface of an electric field extending around the first transmission path.

4. The conveying device according to claim 1, The recessed portions are formed on both sides of the first conveying path.

5. The conveying device according to claim 1, The recessed portion is formed in plurality on one side of the first conveying path. The width of the plurality of recessed portions is set to be larger as the distance from the center of the first conveying path is greater.

6. The conveying device according to claim 1, The recessed portion opens to a predetermined width in the one surface.

7. The conveying device according to claim 1, The recessed portion is formed at a predetermined depth in a normal direction of the one surface.

8. The conveying device according to claim 1, Assume that the wavelength of the electromagnetic wave transmitted by the first transmission path is λ, Let N be an integer greater than 0, The depth of the recessed portion is not less than λ / 4+N·λ / 2 and not more than (N+1)λ / 2.

9. The conveying device according to claim 8, The depth of the concave portion is λ / 4+N·λ / 2.

10. The conveying device according to claim 1, The opening shape of the first transmission path in the above-mentioned one surface is formed into a shape having a long side direction and a short side direction perpendicular to each other. The opening shape of the concave portion in the one surface is symmetrical with respect to a straight line passing through the center of the opening shape of the first conveying path and parallel to the short side direction.

11. The conveying device according to claim 1, The opening shape of the above-mentioned recessed portion in the above-mentioned one surface is formed into an arc shape.

12. The conveying device according to claim 11, The opening shape of the first transmission path in the above-mentioned one surface is formed into a shape having a long side direction and a short side direction perpendicular to each other. The center of the arc constituting the opening shape of the concave portion is arranged on a straight line passing through the center of the opening shape of the first conveying path and parallel to the short-side direction.

13. The conveying device according to claim 12, The center of the arc constituting the opening shape of the recessed portion is located at a position different from the center of the first conveying path.

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