Antenna equipment

Abstract

To provide an antenna device capable of improving performance. [Solution] According to the embodiment, the antenna device includes a first and second member, a transmitting antenna, a receiving antenna, and first and second intermediate members. The first member includes first to third sub-regions. The transmitting antenna is provided between the first sub-region and the second member. The receiving antenna is provided between the second sub-region and the second member. The first intermediate member is provided between the third sub-region and the second member. The first intermediate member includes a first face and a first other face. The first face is located between the first other face and the second member. The first face is electrically connected to the first member. The second intermediate member is fixed to the second member. The first intermediate member is located between the third sub-region and the second intermediate member. The second intermediate member includes a second face and a second other face. The second face is located between the first face and the second other face. At least one of the positions of the first face and the second face changes periodically along a first direction.

Description

[Technical Field]

[0001] Embodiments of the present invention relate to an antenna device. [Background Art]

[0002] For example, antenna devices are used in various types of communication. Improvement in characteristics is desired for antenna devices. [Prior Art Literature] [Patent Literature]

[0003] [Patent Document 1] Japanese Unexamined Patent Publication No. 2005-249659 [Summary of the Invention] [Problem to be Solved by the Invention]

[0004] Embodiments of the present invention provide an antenna device capable of improving characteristics. [Means for Solving the Problem]

[0005] According to embodiments of the present invention, the antenna device includes a first member, a second member, a transmitting antenna, a receiving antenna, a first intermediate member, and a second intermediate member. The first member includes a first partial region, a second partial region, and a third partial region member. The third partial region lies between the first partial region and the second partial region in a first direction from the first partial region to the second partial region. The transmitting antenna is provided between the first partial region and the second member in a second direction intersecting the first direction and is fixed to the first partial region. The receiving antenna is provided between the second partial region and the second member in a second direction and is fixed to the second partial region. The first intermediate member lies between the third partial region and the second member in a second direction and is fixed to the third partial region. The first intermediate member includes a first surface and a first other surface. The first other surface faces the third partial region. The first surface lies between the first other surface and the second member in a second direction. The first surface is conductive. The first surface is electrically connected to the first member. The second intermediate member is fixed to the second member. In the second direction, the first intermediate member is located between the third subregion and the second intermediate member. The second intermediate member includes a second surface and a second other surface. The second surface is conductive. In the second direction, the second surface is located between the first surface and the second other surface. At least one of the first position of the first surface in the second direction and the second position of the second surface in the second direction changes periodically along the first direction. [Brief explanation of the drawing]

[0006] [Figure 1] Figures 1(a) and 1(b) are schematic diagrams illustrating an antenna device according to the first embodiment. [Figure 2] Figures 2(a) to 2(c) are schematic diagrams illustrating the characteristics of an antenna device. [Figure 3] Figures 3(a) and 3(b) are schematic diagrams illustrating an antenna device according to the first embodiment. [Figure 4] Figures 4(a) and 4(b) are schematic diagrams illustrating an antenna device according to the second embodiment. [Figure 5] Figure 5 is a schematic diagram illustrating the characteristics of an antenna device according to the second embodiment. [Modes for carrying out the invention]

[0007] Embodiments of the present invention will be described below with reference to the drawings. Drawings are schematic or conceptual, and the relationships between the thickness and width of each part, as well as the ratios of the sizes of different parts, are not necessarily identical to those of reality. Even when representing the same part, the dimensions and ratios may be depicted differently in different drawings. In this specification and in each figure, elements similar to those described above are denoted by the same reference numerals, and detailed explanations are omitted as appropriate.

[0008] (First Embodiment) Figures 1(a) and 1(b) are schematic diagrams illustrating an antenna device according to the first embodiment. Figure 1(a) is a cross-sectional view. Figure 1(b) is a plan view. As shown in Figure 1(a), the antenna device 110 according to this embodiment includes a first member 41, a second member 42, a transmitting antenna 31, a receiving antenna 32, a first intermediate member 10, and a second intermediate member 20.

[0009] The first member 41 is conductive. The first member 41 includes a first subregion 41a, a second subregion 41b, and a third subregion 41c. The third subregion 41c is located between the first subregion 41a and the second subregion 41b in a first direction D1 from the first subregion 41a to the second subregion 41b.

[0010] The first direction D1 is defined as the X-axis direction. One direction perpendicular to the X-axis direction is defined as the Z-axis direction. The directions perpendicular to both the X-axis and Z-axis directions are defined as the Y-axis direction.

[0011] The first member 41 is, for example, aligned with the XY plane. The first member 41 may be layered or plate-shaped.

[0012] The transmitting antenna 31 is provided between the first partial region 41a and the second member 42 in a second direction D2 that intersects the first direction D1. The transmitting antenna 31 is fixed to the first partial region 41a. The second direction D2 may be, for example, the Z-axis direction. The region that overlaps with the transmitting antenna 31 in the second direction D2 corresponds to the first partial region 41a. In this example, the transmitting antenna 31 includes a first insulating layer 31b and a first conductive layer 31c. The first insulating layer 31b is located between the first partial region 41a and the first conductive layer 31c. The first conductive layer 31c has a shape that functions as an antenna. In these figures, the shape that functions as an antenna is omitted. The transmitting antenna 31 may have a laminated structure that includes multiple layers.

[0013] The receiving antenna 32 is provided between the second partial region 41b and the second member 42 in the second direction D2. The receiving antenna 32 is fixed to the second partial region 41b. The region overlapping with the receiving antenna 32 in the second direction D2 corresponds to the second partial region 41b. In this example, the receiving antenna 32 includes a second insulating layer 32b and a second conductive layer 32c. The second insulating layer 32b is located between the second partial region 41b and the second conductive layer 32c. The second conductive layer 32c has a shape that functions as an antenna. In these figures, the shape that functions as an antenna is omitted. The transmitting antenna 31 may have a laminated structure including multiple layers.

[0014] The first intermediate member 10 is provided between the third partial region 41c and the second member 42 in the second direction D2. The first intermediate member 10 is fixed to the third partial region 41c. The region that overlaps with the first intermediate member 10 in the second direction D2 may correspond to the third partial region 41c.

[0015] The first intermediate member 10 includes a first surface 10a and a first other surface 10b. The first other surface 10b faces the third partial region 41c. The first surface 10a is located between the first other surface 10b and the second member 42 in the second direction D2. The first surface 10a is conductive. The first surface 10a is electrically connected to the first member 41.

[0016] In one example, the entire first intermediate member 10 may be conductive. In another example, a surface portion of the first intermediate member 10 is conductive. For example, the first intermediate member 10 may include an insulating member and a conductive layer provided on a surface of the insulating member. The first surface 10a and the first other surface 10b may include this conductive layer. The conductive first surface 10a may be electrically connected to the first member 41 via the first other surface 10b.

[0017] The second intermediate member 20 is fixed to the second member 42. In the second direction D2, the first intermediate member 10 is located between the third partial region 41c and the second intermediate member 20. The second intermediate member 20 includes a second surface 20a and a second other surface 20b. The second surface 20a is conductive. In the second direction D2, the second surface 20a is located between the first surface 10a and the second other surface 20b. For example, the second surface 20a may face the first surface 10a.

[0018] For example, a gap may be provided between the first intermediate member 10 and the second intermediate member 20. A gap may be provided between the first intermediate member 10 and the second member 42. The second member 42 may be insulative, for example. Radio waves from the transmission antenna 31 may be emitted to the outside through a part of the second member 42. Radio waves from the outside may be incident on the reception antenna 32 through another part of the second member 42. The second member 42 may be a radome, for example.

[0019] In the embodiment, at least one of a first position of the first surface 10a in the second direction D2 and a second position of the second surface 20a in the second direction D2 periodically changes along the first direction D1.

[0020] In this example, the first surface 10a includes a plurality of first recesses 10d and a plurality of first apexes 10p. The plurality of first recesses 10d and the plurality of first apexes 10p are arranged along the first direction D1. One of the plurality of first apexes 10p is located between one of the plurality of first recesses 10d and another one of the plurality of first recesses 10d in the first direction D1. For example, the first recesses 10d and the first apexes 10p may be alternately provided in the first direction D1.

[0021] As shown in FIG. 1(b), the plurality of first recesses 10d extend along the third direction D3. The third direction D3 intersects a plane including the first direction D1 and the second direction D2. For example, the third direction D3 may be the Y-axis direction. Each of the plurality of first recesses 10d may be a groove extending along the third direction D3. Each of the plurality of first apex portions 10p may extend along the third direction D3.

[0022] In such a first surface 10a, the positions of the plurality of first recesses 10d in the second direction D2 are different from the positions of the plurality of first apex portions 10p in the second direction D2. Accordingly, the first position of the first surface 10a in the second direction D2 periodically changes along the second direction D2. For example, the first surface 10a has a first corrugated structure.

[0023] With such a structure, radio waves from the transmission antenna 31 are suppressed from reaching the reception antenna 32. For example, a radio wave from the transmission antenna 31 propagates toward the reception antenna 32 via the second member 42 (e.g., a radome) and is incident on the reception antenna 32. In the embodiment, by providing the first intermediate member 10 and the second intermediate member 20 described above, it is possible to suppress the leakage of a transmission wave to the reception antenna 32. Accordingly, unnecessary noise components are suppressed. According to the embodiment, an antenna device capable of improving characteristics can be provided.

[0024] FIGS. 2(a) to 2(c) are schematic views illustrating characteristics of the antenna device. These figures illustrate simulation results of electric field amplitude distribution when a transmission wave is radiated from the transmission antenna 31. FIG. 2(a) corresponds to the antenna device 110 described above. FIG. 2(b) corresponds to the antenna device 118 of a first reference example. In the antenna device 118, the first intermediate member 10 and the second intermediate member 20 are not provided. FIG. 2(c) corresponds to the antenna device 119 of a second reference example. In the antenna device 119, the first intermediate member 10 is provided, and the second intermediate member 20 is not provided. In these figures, the contrast of the image corresponds to the intensity of the electric field amplitude.

[0025] As shown in Figure 2(b), in the antenna device 118 of the first reference example, the intensity of the electric field amplitude is high near the receiving antenna 32. As shown in Figure 2(c), in the antenna device 119 of the second reference example, the intensity of the electric field amplitude near the receiving antenna 32 is lower than that of antenna device 118. In this way, by providing the first intermediate member 10, the transmission wave from the transmitting antenna 31 reaching the receiving antenna 32 can be suppressed to some extent.

[0026] As shown in Figure 2(a), in the antenna device 110 according to this embodiment, the intensity of the electric field amplitude near the receiving antenna 32 is even lower than that of the antenna device 119. In this way, by providing the first intermediate member 10 and the second intermediate member 20, the leakage of transmitted waves to the receiving antenna 32 can be suppressed. An antenna device with improved characteristics can be provided.

[0027] For example, by providing the first intermediate member 10 and the second intermediate member 20, it is thought that the transmitted wave is attenuated by the interaction of these intermediate members.

[0028] As shown in Figure 1(a), the distance dz0 between the first surface 10a and the second surface 20a may change periodically along the first direction D1. The periodic change in distance dz0 is based on the plurality of first recesses 10d and the plurality of first apex portions 10p described above. The transmitted wave may be attenuated due to the periodic change in distance dz0. In this embodiment, the first surface 10a does not overlap with the second surface 20a in the first direction D1.

[0029] The average distance between the first surface 10a and the second surface 20a (the average of the periodically changing distance dz0) can be substantially constant in the first direction D1.

[0030] As shown in Figure 1(a), the distance along the second direction D2 between the multiple first vertices 10p and the second surface 20a is defined as the first distance dz1. The pitch along the first direction D1 between the multiple first recesses 10d is defined as the first pitch pt1. The first distance dz1 may be, for example, 0.05 to 10 times the first pitch pt1. A short first distance dz1 allows the transmitted wave to be effectively attenuated, for example, by the interaction between the first intermediate member 10 and the second intermediate member 20.

[0031] In this embodiment, the transmitting antenna 31 is configured to transmit a radio wave (transmitted wave) with a first wavelength λ1. In this embodiment, the first distance dz1 is preferably 1 / 2 or less of the first wavelength λ1. This effectively attenuates the orthogonal polarization of the transmitted wave. The electric field component of the orthogonal polarization is along the third direction D3.

[0032] In the embodiment, it is even more preferable that the first distance dz1 is 1 / 4 or less of the first wavelength λ1. This effectively attenuates, for example, the parallel polarization of the transmitted wave in addition to the orthogonal polarization of the transmitted wave. The magnetic field component of the parallel polarization is along the third direction D3.

[0033] In this embodiment, the depth of the plurality of first recesses 10d is defined as the first depth dd1. The first depth dd1 corresponds to the distance in the second direction D2 between the position of one of the plurality of first recesses 10d in the second direction D2 and the position of one of the plurality of first apex portions 10p in the second direction D2. The first depth dd1 may substantially be 1 / 4 of the first wavelength λ1. This allows the first surface 10a to function effectively as a magnetic wall for parallel polarization. The first depth dd1 may also be, for example, between 0.8 and 1.2 times 1 / 4 of the first wavelength λ1. This effectively attenuates the transmitted wave.

[0034] As shown in Figure 1(a), the length of one of the multiple first recesses 10d in the first direction D1 is defined as the first recess length Ld1. The first recess length Ld1 may be, for example, 0.3 to 0.7 times the first pitch pt1. The first pitch pt1 may be 0.05 to 0.5 times the first wavelength λ1.

[0035] In the example of the antenna device 110, the second surface 20a may be substantially flat. The distance in the second direction D2 between the second position in the second direction D2 of the second surface 20a and the third sub-region 41c may be substantially constant. This distance may be 1 / 5 or less of the first depth dd1.

[0036] In one example, the first wavelength λ1 may be between 4 mm and 25 mm.

[0037] In one example, the distance d0 between the first member 41 and the second member 42 along the second direction D2 (see Figure 1(a)) may be between 0.1 mm and 6 mm. For example, this can effectively suppress the leakage of transmitted waves to the receiving antenna 32. In another example, the distance L3 between the transmitting antenna 31 and the receiving antenna 32 in the first direction D1 (see Figure 1(b)) may be between 50 mm and 500 mm. For example, a compact antenna device 110 can be obtained.

[0038] As shown in Figure 1(a), the distance between the transmitting antenna 31 and the second intermediate member 20 along the first direction D1 is defined as the first direction distance L1. The distance between the transmitting antenna 31 and the second intermediate member 20 along the second direction D2 is defined as the second direction distance L2. In this embodiment, the ratio of the first direction distance L1 to the second direction distance L2 may be between 1 and 10. For example, the directivity of the transmitted wave emitted from the transmitting antenna 31 can be properly maintained.

[0039] As shown in Figure 1(a), the second member 42 may include a first layer 42a, a second layer 42b, and an intermediate layer 42c. The first layer 42a is located between the first member 41 and the second layer 42b in the second direction D2. The intermediate layer 42c is located between the first layer 42a and the second layer 42b. With this configuration, high mechanical strength can be obtained in the second member 42.

[0040] The intermediate layer 42c may be provided between a part of the first layer 42a and a part of the second layer 42b. The second intermediate member 20 is located between another part of the first layer 42a and another part of the second layer 42b. For example, the position of the second intermediate member 20 is stabilized. The second member 42 may contain, for example, a resin. The second member 42 may contain, for example, fiber reinforced plastics (FRP). The second layer 42b may contain, for example, glass fiber reinforced plastics (GFRP).

[0041] The second intermediate member 20 may include, for example, at least one selected from the group consisting of metal and resin. The resin may include fibers and resin materials. At least a portion of the second intermediate member 20 may include Carbon Fiber Reinforced Plastics (CFRP). Differences in properties such as the coefficient of thermal expansion between the second intermediate member 20 and the second member 42 can be easily reduced. Stable second intermediate member 20 and second member 42 can be easily obtained.

[0042] As already described, in the embodiment, at least one of the first position of the first surface 10a in the second direction D2 and the second position of the second surface 20a in the second direction D2 may change periodically along the first direction D1. In the embodiment, at least one of the first surface 10a and the second surface 20a may include a plurality of recesses (a plurality of first recesses 10d in the example of the antenna device 110) aligned along the first direction D1. The plurality of recesses (a plurality of first recesses 10d in the example of the antenna device 110) extend along a third direction D3 that intersects the plane including the first direction D1 and the second direction D2. The average distance between the first surface 10a and the second surface 20a may be substantially constant in the first direction D1.

[0043] Figures 3(a) and 3(b) are schematic diagrams illustrating an antenna device according to the first embodiment. Figure 3(a) is a cross-sectional view. Figure 3(b) is a plan view. As shown in Figure 3(a), in the antenna device 111 according to this embodiment, the surface of the second intermediate member 20 includes irregularities. In this example, the surface of the first intermediate member 10 does not include irregularities. The configuration of the antenna device 110, excluding this, may be the same as that of the antenna device 111.

[0044] As shown in Figure 3(a), in the antenna device 111, the second surface 20a includes a plurality of second recesses 20d and a plurality of second vertices 20p aligned along the first direction D1. One of the plurality of second vertices 20p lies between one of the plurality of second recesses 20d and another of the plurality of second recesses 20d in the first direction D1. As shown in Figure 3(b), the plurality of second recesses 20d extend along the third direction D3.

[0045] The distance along the second direction D2 between the multiple second vertices 20p and the first surface 10a is defined as the second distance dz2. The pitch along the first direction D1 between the multiple second recesses 20d is defined as the second pitch pt2. For example, the second distance dz2 is between 0.05 and 10 times the second pitch pt2. A short second distance dz2 allows the transmitted wave to be effectively attenuated, for example, by the interaction between the first intermediate member 10 and the second intermediate member 20.

[0046] The transmitting antenna 31 is configured to transmit a radio wave (transmitted wave) with a first wavelength λ1. The second distance dz2 is preferably 1 / 2 or less of the first wavelength λ1. This effectively attenuates the orthogonal polarization of the transmitted wave. The electric field component of the orthogonal polarization lies along the third direction D3.

[0047] It is even more preferable that the second distance dz2 is less than or equal to 1 / 4 of the first wavelength λ1. This effectively attenuates, for example, the parallel polarization of the transmitted wave in addition to the orthogonal polarization of the transmitted wave. The magnetic field component of the parallel polarization is along the third direction D3.

[0048] In this embodiment, the depth of the plurality of second recesses 20d is defined as the second depth dd2. The second depth dd2 corresponds to the distance in the second direction D2 between the position of one of the plurality of second recesses 20d in the second direction D2 and the position of one of the plurality of second apex portions 20p in the second direction D2. The second depth dd2 may substantially be 1 / 4 of the first wavelength λ1. This allows the second surface 20a to function effectively as a magnetic wall. The second depth dd2 may also be, for example, between 0.8 and 1.2 times 1 / 4 of the first wavelength λ1. This effectively attenuates the transmitted wave. The second pitch pt2 may be between 0.05 and 0.5 times the first wavelength λ1.

[0049] In the example of the antenna device 111, the first surface 10a may be substantially flat. The distance in the second direction D2 between the first position in the second direction D2 of the first surface 10a and the third sub-region 41c may be substantially constant. This distance may be 1 / 5 or less of the second depth dd2.

[0050] In the antenna device 111, at least one of the first surface 10a and the second surface 20a may include a plurality of recesses (a plurality of second recesses 20d in the example of the antenna device 111) aligned along the first direction D1. The plurality of recesses (a plurality of second recesses 20d in the example of the antenna device 111) extend along a third direction D3 that intersects the plane containing the first direction D1 and the second direction D2. The average distance between the first surface 10a and the second surface 20a may be substantially constant in the first direction D1.

[0051] (Second Embodiment) Figures 4(a) and 4(b) are schematic diagrams illustrating an antenna device according to the second embodiment. Figure 4(a) is a cross-sectional view. Figure 4(b) is a plan view. As shown in Figure 4(a), in the antenna device 112 according to this embodiment, the second other surface 20b of the second intermediate member 20 has irregularities. The configuration of the antenna device 112, excluding this, may be the same as the configuration of the antenna device 110 or the antenna device 111.

[0052] As shown in Figure 4(a), the second other surface 20b includes a plurality of third recesses 30d and a plurality of third vertices 30p aligned along the first direction D1. One of the plurality of third vertices 30p lies between one of the plurality of third recesses 30d and another of the plurality of third recesses 30d in the first direction D1. As shown in Figure 4(b), the plurality of third recesses 30d extend along the third direction D3.

[0053] The third depth dd3 of the multiple third recesses 30d can be substantially 1 / 4 of the first wavelength λ1. This allows the second other surface 20b to function effectively as a magnetic wall for parallel polarization. The third depth dd3 can also be, for example, between 0.8 and 1.2 times 1 / 4 of the first wavelength λ1. The transmitted wave is effectively attenuated.

[0054] In this embodiment, the pitch of the plurality of third recesses 30d along the first direction D1 is defined as the third pitch pt3. The third pitch pt3 may be 0.05 times or more and 0.5 times or less the first wavelength λ1.

[0055] Figure 5 is a schematic diagram illustrating the characteristics of an antenna device according to the second embodiment. Figure 5 illustrates the simulation results of the electric field amplitude distribution when a transmitted wave is radiated from the transmitting antenna 31. In Figure 5, the grayscale of the image corresponds to the intensity of the electric field amplitude. As shown in Figure 5, in the antenna device 112 according to this embodiment, the intensity of the electric field amplitude is even lower in the vicinity of the receiving antenna 32. By providing the first intermediate member 10 and the second intermediate member 20, the leakage of transmitted waves to the receiving antenna 32 can be suppressed. An antenna device with improved characteristics can be provided.

[0056] In the embodiment, the transmitting antenna 31 may include a phased array antenna whose beam direction can be electronically controlled. The receiving antenna 32 may include a phased array antenna whose beam direction can be electronically controlled. These antennas may include antennas of other configurations.

[0057] In an antenna system including a transmitting antenna 31 and a receiving antenna 32, the transmitted wave from the transmitting antenna 31 is incident on the receiving antenna 32, increasing the received noise. For example, saturation of the amplifier in the receiving antenna 32 occurs, making it difficult to obtain the desired characteristics. If the antenna system includes a radome, the transmitted wave reaches the receiving antenna 32 via a propagation path along the radome, further increasing the leakage power to the receiving antenna 32.

[0058] In the third reference example, a planar structure including a metal layer and a radio wave absorber is provided between the transmitting antenna 31 and the receiving antenna 32. In the third reference example, the planar structure is provided inside the space enclosed by the radome. In the third reference example, for example, it is not possible to sufficiently suppress the incidence of transmitted waves propagating along the outer surface of the radome onto the receiving antenna 32. In the third reference example, high precision is required for the components included.

[0059] In this embodiment, a simple configuration effectively suppresses the leakage of the transmitted wave to the receiving antenna 32. Precision requirements are relaxed in the included components. Furthermore, a reduction in the mechanical strength of the radome, for example, can also be suppressed.

[0060] The embodiments may include the following technical proposals. (Technical proposal 1) A conductive first member comprising a first partial region, a second partial region, and a third partial region between the first partial region and the second partial region in a first direction from the first partial region to the second partial region, The second member and A transmitting antenna is provided between the first partial region and the second member in a second direction intersecting the first direction and is fixed to the first partial region, A receiving antenna is provided between the second partial region and the second member in the second direction and fixed to the second partial region, A first intermediate member provided between the third partial region and the second member in the second direction and fixed to the third partial region, the first intermediate member including a first surface and a first other surface, the first other surface facing the third partial region, the first surface located between the first other surface and the second member in the second direction, the first surface being conductive, and the first surface being electrically connected to the first member, A second intermediate member fixed to the second member, wherein in the second direction the first intermediate member is located between the third partial region and the second intermediate member, the second intermediate member includes a second surface and a second other surface, the second surface is conductive, and the second surface is located between the first surface and the second other surface in the second direction, Equipped with, An antenna device wherein at least one of the first position on the first surface in the second direction and the second position on the second surface in the second direction changes periodically along the first direction.

[0061] (Technical proposal 2) At least one of the first surface and the second surface includes a plurality of recesses arranged along the first direction, The antenna device according to Technical Proposal 1, wherein the plurality of recesses extend along a third direction intersecting a plane including the first and second directions.

[0062] (Technical proposal 3) The antenna device according to Technical Proposal 1 or 2, wherein the average distance between the first surface and the second surface is substantially constant in the first direction.

[0063] (Technical proposal 4) The first surface includes the plurality of first recesses and the plurality of first apexes arranged along the first direction, One of the plurality of first vertices is located in the first direction between one of the plurality of first recesses and another of the plurality of first recesses. The plurality of first recesses extend along a third direction that intersects a plane including the first and second directions, The antenna device according to Technical Proposal 1, wherein the first distance along the second direction between the plurality of first vertices and the second surface is 0.05 times or more and 10 times or less the first pitch of the plurality of first recesses along the first direction.

[0064] (Technical proposal 5) The transmitting antenna is configured to transmit a radio wave of the first wavelength. The antenna device according to Technical Proposal 4, wherein the first distance is less than or equal to half of the first wavelength.

[0065] (Technical proposal 6) The antenna device according to Technical Proposal 5, wherein the first distance is 1 / 4 or less of the first wavelength.

[0066] (Technical proposal 7) The antenna device according to Technical Proposal 5 or 6, wherein the first depth of the plurality of first recesses is 0.8 times or more and 1.2 times or less of 1 / 4 of the first wavelength.

[0067] (Technical proposal 8) The antenna device according to any one of the technical proposals 4 to 6, wherein the distance in the second direction between the second position and the third sub-region is substantially constant.

[0068] (Technical proposal 9) The second surface includes the plurality of second recesses and the plurality of second vertices arranged along the first direction, One of the plurality of second vertices is located between one of the plurality of second recesses and another of the plurality of second recesses in the first direction. The plurality of second recesses extend along the third direction, The antenna device according to Technical Proposal 4, wherein the second distance along the second direction between the plurality of second vertices and the first surface is 0.05 times or more and 10 times or less the second pitch of the plurality of second recesses along the first direction.

[0069] (Technical proposal 10) The transmitting antenna is configured to transmit a radio wave of the first wavelength. The antenna device according to Technical Proposal 9, wherein the second distance is less than or equal to half of the first wavelength.

[0070] (Technical proposal 11) The antenna device according to Technical Proposal 10, wherein the second distance is 1 / 4 or less of the first wavelength.

[0071] (Technical proposal 12) The antenna device according to technical proposal 10 or 11, wherein the second depth of the plurality of second recesses is 0.8 times or more and 1.2 times or less of 1 / 4 of the first wavelength.

[0072] (Technical proposal 13) The distance in the second direction between the first position and the third sub-region is substantially constant, as described in any one of the technical proposals 9 to 12.

[0073] (Technical proposal 14) The second other surface includes the plurality of third recesses and the plurality of third vertices arranged along the first direction, One of the plurality of third vertices is located in the first direction between one of the plurality of third recesses and another of the plurality of third recesses. The plurality of third recesses extend along the third direction, The antenna device according to Technical Proposal 5 or 10, wherein the third depth of the plurality of third recesses is 0.8 times or more and 1.2 times or less of 1 / 4 of the first wavelength.

[0074] (Technical proposal 15) The aforementioned second member includes a first layer, a second layer, and an intermediate layer. The first layer is located between the first member and the second layer in the second direction. The aforementioned intermediate layer is located between a part of the first layer and a part of the second layer. The antenna device according to any one of Technical Proposals 1 to 14, wherein the second intermediate member is located between another part of the first layer and another part of the second layer.

[0075] (Technical proposal 16) The second intermediate member includes at least one selected from the group consisting of metal and resin. The aforementioned resin includes fibers and resin materials, as described in any one of Technical Proposals 1 to 15, for the antenna device.

[0076] (Technical proposal 17) The antenna device according to Technical Proposal 5 or 10, wherein the first wavelength is 4 mm or more and 25 mm or less.

[0077] (Technical proposal 18) The antenna device according to any one of Technical Proposals 1 to 17, wherein the distance between the first member and the second member along the second direction is 0.1 mm or more and 6 mm or less.

[0078] (Technical proposal 19) The antenna device according to any one of Technical Proposals 1 to 18, wherein the distance between the transmitting antenna and the receiving antenna in the first direction is 50 mm or more and 500 mm or less.

[0079] (Technical proposal 20) The antenna device according to any one of Technical Proposals 1 to 19, wherein the ratio of the first directional distance along the first direction between the transmitting antenna and the second intermediate member to the second directional distance along the second direction between the transmitting antenna and the second intermediate member is 1 or more and 10 or less.

[0080] According to the embodiment, an antenna device capable of improving characteristics is provided.

[0081] Embodiments of the present invention have been described above with reference to examples. However, the present invention is not limited to these examples. For example, the specific configuration of each element, such as members included in an antenna device, transmitting antenna, receiving antenna, and intermediate members, is included within the scope of the present invention as long as those skilled in the art can appropriately select from the known scope to implement the present invention in the same way and obtain similar effects.

[0082] Combinations of two or more elements from each example, to the extent technically feasible, are also included within the scope of the present invention, insofar as they encompass the gist of the invention.

[0083] All antenna devices that a person skilled in the art can implement by appropriately modifying the design based on the antenna device described above as an embodiment of the present invention also fall within the scope of the present invention, insofar as they encompass the gist of the present invention.

[0084] Within the scope of the concept of this invention, a person skilled in the art would be able to conceive of various modifications and alterations, and it is understood that such modifications and alterations also fall within the scope of this invention.

[0085] While several embodiments of the present invention have been described, these embodiments are presented as examples only and are not intended to limit the scope of the invention. These novel embodiments can be carried out in a variety of other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their variations are included in the scope and spirit of the invention, as well as in the claims of the invention and its equivalents. [Explanation of symbols]

[0086] 10, 20: First and second intermediate members, 10a, 20a: First and second surfaces, 10b, 20b: First and second other surfaces, 10d, 20d: First and second recesses, 30d: Third recess, 30p: Third top, 31: Transmitting antenna, 31b, 32b: First and second insulating layers, 31c, 32c: First and second conductive layers, 32: Receiving antenna, 41, 42: First and second members, 41a~41c: First to third partial regions, 42a, 42b: First and second layers, 42c: Intermediate layer, 110~112, 118, 119: Antenna device, D1~D3: First to third directions, L1, L2: First and second direction distance, L3: Distance between antennas, Ld1: Length of the first recess, d0: Distance between members, dd1~dd3: Depth of the first to third recesses, dz0: Distance, dz1, dz2: Distance of the first and second recesses, pt1~pt3: Pitch of the first to third recesses

Claims

1. A conductive first member comprising a first partial region, a second partial region, and a third partial region between the first partial region and the second partial region in a first direction from the first partial region to the second partial region, The second member and A transmitting antenna is provided between the first partial region and the second member in a second direction intersecting the first direction and is fixed to the first partial region, A receiving antenna is provided between the second partial region and the second member in the second direction and fixed to the second partial region, A first intermediate member provided between the third partial region and the second member in the second direction and fixed to the third partial region, the first intermediate member including a first surface and a first other surface, the first other surface facing the third partial region, the first surface located between the first other surface and the second member in the second direction, the first surface being conductive, and the first surface being electrically connected to the first member, A second intermediate member fixed to the second member, wherein in the second direction the first intermediate member is located between the third partial region and the second intermediate member, the second intermediate member includes a second surface and a second other surface, the second surface is conductive, and the second surface is located between the first surface and the second other surface in the second direction, Equipped with, An antenna device wherein at least one of the first position on the first surface in the second direction and the second position on the second surface in the second direction changes periodically along the first direction.

2. At least one of the first surface and the second surface includes a plurality of recesses arranged along the first direction, The antenna device according to claim 1, wherein the plurality of recesses extend along a third direction intersecting a plane including the first and second directions.

3. The antenna device according to claim 1 or 2, wherein the average distance between the first surface and the second surface is substantially constant in the first direction.

4. The first surface includes the plurality of first recesses and the plurality of first apex portions arranged along the first direction, One of the plurality of first vertices is located between one of the plurality of first recesses and another of the plurality of first recesses in the first direction. The plurality of first recesses extend along a third direction that intersects a plane including the first and second directions, The antenna device according to claim 1, wherein the first distance along the second direction between the plurality of first vertices and the second surface is 0.05 times or more and 10 times or less the first pitch of the plurality of first recesses along the first direction.

5. The transmitting antenna is configured to transmit a radio wave of the first wavelength. The antenna device according to claim 4, wherein the first distance is 1 / 2 or less of the first wavelength.

6. The antenna device according to claim 5, wherein the first distance is 1 / 4 or less of the first wavelength.

7. The antenna device according to claim 5 or 6, wherein the first depth of the plurality of first recesses is 0.8 times or more and 1.2 times or less of 1 / 4 of the first wavelength.

8. The antenna device according to any one of claims 4 to 6, wherein the distance in the second direction between the second position and the third sub-region is substantially constant.

9. The second surface includes the plurality of second recesses and the plurality of second vertices arranged along the first direction, One of the plurality of second vertices is located between one of the plurality of second recesses and another of the plurality of second recesses in the first direction. The plurality of second recesses extend along the third direction, The antenna device according to claim 4, wherein the second distance along the second direction between the plurality of second vertices and the first surface is 0.05 times or more and 10 times or less the second pitch of the plurality of second recesses along the first direction.

10. The transmitting antenna is configured to transmit a radio wave of the first wavelength. The antenna device according to claim 9, wherein the second distance is 1 / 2 or less of the first wavelength.

11. The antenna device according to claim 10, wherein the second distance is 1 / 4 or less of the first wavelength.

12. The antenna device according to claim 10 or 11, wherein the second depth of the plurality of second recesses is 0.8 times or more and 1.2 times or less of 1 / 4 of the first wavelength.

13. The distance in the second direction between the first position and the third partial region is substantially constant, the antenna device according to claim 9.

14. The second other surface includes the plurality of third recesses and the plurality of third vertices arranged along the first direction, One of the plurality of third vertices is located between one of the plurality of third recesses and another of the plurality of third recesses in the first direction. The plurality of third recesses extend along the third direction, The antenna device according to claim 5 or 10, wherein the third depth of the plurality of third recesses is 0.8 times or more and 1.2 times or less of 1 / 4 of the first wavelength.

15. The aforementioned second member includes a first layer, a second layer, and an intermediate layer. The first layer is located between the first member and the second layer in the second direction. The aforementioned intermediate layer is located between a part of the first layer and a part of the second layer. The antenna device according to claim 1 or 2, wherein the second intermediate member is located between another part of the first layer and another part of the second layer.

16. The second intermediate member includes at least one selected from the group consisting of metal and resin. The antenna device according to claim 1 or 2, wherein the resin comprises fibers and a resin material.

17. The antenna device according to claim 5 or 10, wherein the first wavelength is 4 mm or more and 25 mm or less.

18. The antenna device according to claim 1 or 2, wherein the distance between the first member and the second member along the second direction is 0.1 mm or more and 6 mm or less.

19. The antenna device according to claim 1 or 2, wherein the distance between the transmitting antenna and the receiving antenna in the first direction is 50 mm or more and 500 mm or less.

20. The antenna device according to claim 1 or 2, wherein the ratio of the first directional distance along the first direction between the transmitting antenna and the second intermediate member to the second directional distance along the second direction between the transmitting antenna and the second intermediate member is 1 or more and 10 or less.

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