Vehicle antenna device

Abstract

To provide an antenna device that achieves a desired radiation pattern.SOLUTION: An antenna device 10A includes a plurality of antenna elements 300A, 400A each having radiating elements 310A, 410A and at least one of parasitic elements 320A, 330A, 420A, 430A. The plurality of antenna elements are arranged in a direction intersecting an arrangement direction of the radiating element in at least one antenna element of the plurality of antenna elements, and at least one parasitic element.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to an antenna device. [Background technology]

[0002] In recent years, various antenna devices have been developed. For example, Patent Document 1 describes an example of a directional antenna. This directional antenna includes a central element and a plurality of parasitic elements arranged around the central element. The central element has a conductive radiator. Each parasitic element includes a monopole antenna element and an image element. When the monopole antenna element and the image element are connected to each other, each parasitic element operates in a reflection mode. When the monopole antenna element and the image element are not connected to each other, each parasitic element operates in a directional mode. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Special Publication No. 2006-504353 Summary of the Invention [Problem to be solved by the invention]

[0004] For example, as described in Patent Document 1, some antenna devices may require directivity in a predetermined direction. However, depending on the application of the antenna device, not only directivity in the predetermined direction but also, for example, directivity to the side of the predetermined direction may be required. For this reason, it is necessary to realize a desired radiation pattern for the antenna device.

[0005] One object of the present invention is to provide a desired radiation pattern for an antenna device. Other objects of the present invention will become apparent from the description herein. [Means for solving the problem]

[0006] One aspect of the present invention is a plurality of antenna elements, each having a radiating element and at least one parasitic element; The antenna device has a plurality of antenna elements arranged in a direction intersecting an arrangement direction of the radiating element and the at least one parasitic element in at least one of the plurality of antenna elements. [Effects of the Invention]

[0007] According to the above aspects of the present invention, a desired radiation pattern can be achieved for the antenna device. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 2 is an exploded perspective view of the antenna device according to the first embodiment. [Figure 2] 2 is a perspective view showing a state in which an inner case, an outer case, and an outer pad are removed from the antenna device according to the first embodiment. FIG. [Figure 3] 10 is a graph showing the directivity at 2400 MHz in the horizontal plane of the antenna device according to the first embodiment and the directivity at 2400 MHz in the horizontal plane of the antenna device according to the first comparative example. [Figure 4] 1. FIG. 4 is a perspective view showing an antenna device according to a first modified example in a state where an inner case, an outer case, and an outer pad are removed from the antenna device shown in FIG. [Figure 5] 10 is a graph showing the directivity at 2400 MHz in the horizontal plane of an antenna device according to Modification 1 and the directivity at 2400 MHz in the horizontal plane of an antenna device according to Comparative Example 1. [Figure 6] 1. FIG. 4 is a perspective view showing an antenna device according to a second modified example in which the inner case, the outer case, and the outer pad are removed from the antenna device shown in FIG. [Figure 7]10 is a graph showing the directivity at 2400 MHz in the horizontal plane of an antenna device according to Modification 2 and the directivity at 2400 MHz in the horizontal plane of an antenna device according to Comparative Example 1. [Figure 8] 10 is a perspective view showing a state in which an inner case, an outer case, and an outer pad are removed from the antenna device according to the second embodiment. FIG. [Figure 9] 10 is a graph showing the directivity at 2400 MHz in the horizontal plane of the antenna device according to the second embodiment and the directivity at 2400 MHz in the horizontal plane of the antenna device according to the second comparative example. [Figure 10] FIG. 10 is a perspective view showing a state in which an inner case, an outer case, and an outer pad are removed from the antenna device according to the third embodiment. [Figure 11] 10 is a graph showing the directivity at 2400 MHz in the horizontal plane of the antenna device according to the third embodiment and the directivity at 2400 MHz in the horizontal plane of the antenna device according to the third comparative example. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, embodiments and modifications of the present invention will be described with reference to the drawings. In all the drawings, like components are designated by like reference numerals, and descriptions thereof will be omitted as appropriate.

[0010] In this specification, ordinal numbers such as "first," "second," and "third" are used merely to distinguish between similarly named configurations, unless otherwise specified, and do not imply any particular characteristics (e.g., order or importance) of the configurations.

[0011] FIG. 1 is an exploded perspective view of an antenna device 10 according to the first embodiment.

[0012] In FIG. 1, an arrow indicating the first direction X, the second direction Y, or the third direction Z indicates that the direction from the base end of the arrow to the tip end is the positive direction of the direction indicated by the arrow, and that the direction from the tip end of the arrow to the base end is the negative direction of the direction indicated by the arrow.

[0013] In the first embodiment, the antenna device 10 is mounted on the upper surface of the roof of a vehicle. The vehicle is, for example, a truck, a passenger car, etc. However, the object on which the antenna device 10 is mounted is not limited to a vehicle.

[0014] In FIG. 1, the first direction X indicates the longitudinal direction of the vehicle on which the antenna device 10 is mounted. Specifically, the positive direction of the first direction X is the direction from the rear to the front of the vehicle. The negative direction of the first direction X is the direction from the front to the rear of the vehicle. The second direction Y is perpendicular to the first direction X. The second direction Y indicates the left-right direction of the vehicle. Specifically, the positive direction of the second direction Y is the direction from the right to the left of the vehicle. The negative direction of the second direction Y is the direction from the left to the right of the vehicle. The third direction Z is perpendicular to both the first direction X and the second direction Y. The third direction Z indicates the vertical direction of the vehicle. Specifically, the positive direction of the third direction Z is the direction from the bottom to the top of the vehicle. The negative direction of the third direction Z is the direction from the top to the bottom of the vehicle. Hereinafter, where necessary, a plane perpendicular to the third direction Z will be referred to as a "horizontal plane."

[0015] The antenna device 10 according to the first embodiment includes a base 100A, a mounting seal member 102A, a substrate 200A, a first antenna element 300A, a second antenna element 400A, an inner case 500A, an inner pad 502A, an outer case 600A, an outer pad 602A, and a fastener 700A. The first antenna element 300A includes a first radiating element 310A, a first waveguide element 320A, and a first reflecting element 330A. The second antenna element 400A includes a second radiating element 410A, a second waveguide element 420A, and a second reflecting element 430A. The fastener 700A includes a fastening screw 710A, a washer 720A, and a holder 730A.

[0016] The base 100A is made of, for example, metal. The base 100A is mounted on the upper surface of the roof (not shown) via a mounting seal member 102A. The mounting seal member 102A is made of an elastic material such as elastomer or rubber. When viewed from the third direction Z, the mounting seal member 102A forms a surrounding body that surrounds the fastener 700A. The provision of the mounting seal member 102A can prevent moisture from penetrating into the gap between the underside of the base 100A and the upper surface of the roof.

[0017] The board 200A is mounted on the upper surface of the base 100A. The board 200A is, for example, a printed circuit board (PCB). The board 200A is attached to the base 100A with six board mounting screws 210A.

[0018] The first antenna element 300A is, for example, a Wi-Fi (registered trademark) antenna. The first antenna element 300A is disposed above the base 100A via the substrate 200A. When viewed from above, the first antenna element 300A is located on the right side of the center of the base 100A in the second direction Y. The first antenna element 300A is an array antenna configured with a first radiating element 310A, a first waveguide element 320A, and a first reflecting element 330A.

[0019] The second antenna element 400A is, for example, a Bluetooth (registered trademark) antenna. The second antenna element 400A is disposed above the base 100A via the substrate 200A. When viewed from above, the second antenna element 400A is located on the left side of the center of the base 100A in the second direction Y. The second antenna element 400A is an array antenna configured by a second radiating element 410A, a second waveguide element 420A, and a second reflecting element 430A.

[0020] The inner case 500A is mounted on the upper surface of the base 100A via an inner pad 502A. The inner pad 502A is made of an elastic material such as elastomer or rubber. When viewed from the third direction Z, the inner pad 502A forms a surrounding body that surrounds the substrate 200A, the first antenna element 300A, and the second antenna element 400A. The provision of the inner pad 502A can prevent moisture from entering the gap between the bottom end of the inner case 500A and the upper surface of the base 100A.

[0021] The inner case 500A covers the substrate 200A, the first antenna element 300A, and the second antenna element 400A from above the base 100A. As a result, the inner case 500A, together with the base 100A, form an accommodation space that accommodates the substrate 200A, the first antenna element 300A, and the second antenna element 400A. The inner case 500A is attached to the base 100A with four case mounting screws 510A.

[0022] The outer case 600A is mounted on the upper surface of the roof via an outer pad 602A. The outer pad 602A is made of an elastic material such as elastomer or rubber. When viewed from the third direction Z, the portion of the outer pad 602A from the center in the first direction X to the end on the negative side in the first direction X forms an enclosure that surrounds the base 100A, the substrate 200A, the first antenna element 300A, the second antenna element 400A, and the inner case 500A.

[0023] The fastener 700A fastens the base 100A to the roof and electrically grounds the base 100A to the roof. Specifically, a mounting hole for attaching the antenna device 10 is provided in the roof. The holder 730A is disposed inside the mounting hole. The washer 720A is held by the holder 730A. The fastening screw 710A passes through a through-hole provided in the washer 720A in the third direction Z and is screwed into a screw hole provided in the underside of the base 100A. By screwing the fastening screw 710A into the screw hole in the base 100A, the tip of a claw provided on the washer 720A comes into contact with the underside of the roof. This fastens the base 100A to the roof. The base 100A is also electrically grounded to the roof via the fastening screw 710A and the washer 720A.

[0024] 2 is a perspective view showing a state in which the inner case 500A, the outer case 600A, and the outer pad 602A have been removed from the antenna device 10 according to embodiment 1. Hereinafter, the antenna device according to embodiment 1 shown in FIG. 2 will be referred to as antenna device 10A.

[0025] When viewed from the third direction Z, the substrate 200A has a substantially square shape. When viewed from the third direction Z, the substrate 200A has a first corner 202A located on the positive side of the first direction X and the positive side of the second direction Y. When viewed from the third direction Z, the substrate 200A has a second corner 204A located on the negative side of the first direction X and the positive side of the second direction Y. When viewed from the third direction Z, the substrate 200A has a third corner 206A located on the negative side of the first direction X and the negative side of the second direction Y. When viewed from the third direction Z, the substrate 200A has a fourth corner 208A located on the positive side of the first direction X and the negative side of the second direction Y. However, the shape of the substrate 200A is not limited to this example.

[0026] The first radiating element 310A is a monopole element that is approximately parallel to the third direction Z. The length of the first radiating element 310A in the third direction Z is approximately 1 / 4 of the wavelength of the operating frequency of the first antenna element 300A.

[0027] The bottom end of the first radiating element 310A is attached to the substrate 200A by soldering. The first radiating element 310A is disposed between the third corner 206A and the fourth corner 208A. Specifically, the first radiating element 310A is disposed closer to the fourth corner 208A than to the third corner 206A. However, the method for attaching the first radiating element 310A to the substrate 200A and the position at which the first radiating element 310A is attached are not limited to this example.

[0028] First director element 320A is a monopole element substantially parallel to the third direction Z. First director element 320A is a parasitic element. The lower end of first director element 320A is electrically connected to the ground, such as the roof. The length of first director element 320A in the third direction Z is shorter than the length of first radiating element 310A in the third direction Z. The length of first director element 320A in the third direction Z is, for example, shorter than approximately ¼ of the wavelength of the operating frequency of first antenna element 300A.

[0029] A first mounting portion 322A extends from the lower end of the first waveguide element 320A in the negative direction of the first direction X. The first mounting portion 322A is integral with the first waveguide element 320A. A through-hole is provided in a portion of the first mounting portion 322A on the negative side of the third corner 206A in the first direction X, through which a rib 112A is inserted. The rib 112A is provided on the upper surface of the base 100A on the negative side of the third corner 206A in the first direction X. The first waveguide element 320A is aligned by inserting the rib 112A into the through-hole. A portion of the first mounting portion 322A that overlaps with the third corner 206A in the third direction Z, together with the third corner 206A, is attached to the base 100A by a board mounting screw 210A provided in the third corner 206A. However, the method for attaching the first waveguide element 320A to the base 100A and the substrate 200A is not limited to this example.

[0030] The first reflecting element 330A is a monopole element that is approximately parallel to the third direction Z. The first reflecting element 330A is also a parasitic element. The lower end of the first reflecting element 330A is electrically connected to the ground, such as the roof. The length of the first reflecting element 330A in the third direction Z is longer than the length of the first radiating element 310A in the third direction Z. The length of the first reflecting element 330A in the third direction Z is, for example, longer than approximately ¼ of the wavelength of the operating frequency of the first antenna element 300A.

[0031] A second mounting portion 332A extends from the lower end of the first reflecting element 330A in the negative direction of the first direction X. The second mounting portion 332A is integral with the first reflecting element 330A. A through-hole is provided in a portion of the second mounting portion 332A on the positive side of the first direction X of a fourth corner 208A of the second mounting portion 332A, through which a rib 112A is inserted. The rib 112A is provided on the upper surface of the base 100A on the positive side of the fourth corner 208A in the positive direction X. The first reflecting element 330A is aligned by inserting the rib 112A into the through-hole. A portion of the second mounting portion 332A that overlaps with the fourth corner 208A in the third direction Z, together with the fourth corner 208A, is attached to the base 100A by a board mounting screw 210A provided in the fourth corner 208A. However, the method for attaching first reflecting element 330A to base 100A and substrate 200A is not limited to this example.

[0032] The second radiating element 410A is a monopole element that is approximately parallel to the third direction Z. The length of the second radiating element 410A in the third direction Z is approximately 1 / 4 of the wavelength of the operating frequency of the second antenna element 400A. The length of the second radiating element 410A in the third direction Z is approximately equal to the length of the first radiating element 310A in the third direction Z.

[0033] The bottom end of the second radiating element 410A is attached to the substrate 200A by soldering. The second radiating element 410A is disposed between the first corner 202A and the second corner 204A. Specifically, the second radiating element 410A is disposed closer to the first corner 202A than to the second corner 204A. However, the method for attaching the second radiating element 410A to the substrate 200A and the position at which the second radiating element 410A is attached are not limited to this example.

[0034] Second director element 420A is a monopole element substantially parallel to the third direction Z. Second director element 420A is a parasitic element. The lower end of second director element 420A is electrically connected to the ground, such as the roof. The length in the third direction Z of second director element 420A is shorter than the length in the third direction Z of second radiating element 410A. The length in the third direction Z of second director element 420A is, for example, shorter than approximately ¼ of the wavelength of the operating frequency of second antenna element 400A. The length in the third direction Z of second director element 420A is substantially equal to the length in the third direction Z of first director element 320A.

[0035] A third mounting portion 422A extends from the lower end of the second waveguide element 420A in the negative direction of the first direction X. The third mounting portion 422A is integral with the second waveguide element 420A. A through-hole is provided in a portion of the third mounting portion 422A on the negative side of the second corner 204A in the first direction X, through which a rib 112A is inserted. The rib 112A is provided on the upper surface of the base 100A on the negative side of the second corner 204A in the first direction X. The second waveguide element 420A is aligned by inserting the rib 112A into the through-hole. A portion of the third mounting portion 422A that overlaps with the second corner 204A in the third direction Z, together with the second corner 204A, is attached to the base 100A by a board mounting screw 210A provided in the second corner 204A. However, the method for attaching the second waveguide element 420A to the base 100A and the substrate 200A is not limited to this example.

[0036] Second reflecting element 430A is a monopole element that is approximately parallel to the third direction Z. Second reflecting element 430A is also a parasitic element. The lower end of second reflecting element 430A is electrically connected to the ground, such as the roof. The length in the third direction Z of second reflecting element 430A is longer than the length in the third direction Z of second radiating element 410A. The length in the third direction Z of second reflecting element 430A is, for example, longer than approximately ¼ of the wavelength of the operating frequency of second antenna element 400A. The length in the third direction Z of second reflecting element 430A is also approximately equal to the length in the third direction Z of first reflecting element 330A.

[0037] A fourth mounting portion 432A extends from the lower end of the second reflecting element 430A in the negative direction of the first direction X. The fourth mounting portion 432A is integral with the second reflecting element 430A. A through-hole is provided in a portion of the fourth mounting portion 432A on the positive side of the first corner 202A in the first direction X, through which a rib 112A provided on the upper surface of the base 100A on the positive side of the first corner 202A in the first direction X passes. The second reflecting element 430A is aligned by inserting the rib 112A into the through-hole. A portion of the fourth mounting portion 432A that overlaps with the first corner 202A in the third direction Z, together with the first corner 202A, is attached to the base 100A by a board mounting screw 210A provided in the first corner 202A. However, the method for attaching second reflecting element 430A to base 100A and substrate 200A is not limited to this example.

[0038] When viewed from the third direction Z, the first radiating element 310A, the first waveguide element 320A, and the first reflecting element 330A are arranged substantially parallel to the first direction X. Specifically, when viewed from the third direction Z, the first waveguide element 320A is arranged on the negative side of the first direction X with respect to the first radiating element 310A. Furthermore, when viewed from the third direction Z, the first reflecting element 330A is arranged on the positive side of the first direction X with respect to the first radiating element 310A.

[0039] When viewed from the third direction Z, the second radiating element 410A, the second waveguide element 420A, and the second reflecting element 430A are arranged substantially parallel to the first direction X. Specifically, when viewed from the third direction Z, the second waveguide element 420A is arranged on the negative side of the first direction X with respect to the second radiating element 410A. Furthermore, when viewed from the third direction Z, the second reflecting element 430A is arranged on the positive side of the first direction X with respect to the second radiating element 410A.

[0040] When viewed from the third direction Z, the first radiating element 310A and the second radiating element 410A are arranged substantially parallel to the second direction Y. When viewed from the third direction Z, the first director element 320A and the second director element 420A are arranged substantially parallel to the second direction Y. When viewed from the third direction Z, the first reflecting element 330A and the second reflecting element 430A are arranged substantially parallel to the second direction Y. Therefore, when viewed from the third direction Z, the first director element 320A is arranged on the negative side of the first direction X and the negative side of the second direction Y with respect to the second radiating element 410A. When viewed from the third direction Z, the first reflecting element 330A is arranged on the positive side of the first direction X and the negative side of the second direction Y with respect to the second radiating element 410A. When viewed from the third direction Z, the second waveguide element 420A is disposed on the negative side in the first direction X and the positive side in the second direction Y with respect to the first radiating element 310A. When viewed from the third direction Z, the second reflecting element 430A is disposed on the positive side in the first direction X and the positive side in the second direction Y with respect to the first radiating element 310A.

[0041] 3 is a graph showing the directivity at 2400 MHz in the horizontal plane of the antenna device 10A according to the first embodiment and the directivity at 2400 MHz in the horizontal plane of the antenna device according to the comparative example 1. The antenna device according to the comparative example 1 is similar to the antenna device 10A according to the first embodiment except that the second antenna element 400A is not provided.

[0042] In FIG. 3, the white circle with a black dot indicating the third direction Z indicates that the direction from the back of the page to the front is the positive direction of the third direction Z, and the direction from the front of the page to the back is the negative direction of the third direction Z. Numbers added to the periphery of the graph shown in FIG. 3 indicate directions (unit: °) in the horizontal plane. In the graph shown in FIG. 3, the negative direction of the first direction X is the 0° direction, the negative direction of the second direction Y is the 90° direction, the positive direction of the second direction Y is the -90° direction, and the positive direction of the first direction X is the 180° direction. In the graphs of FIGS. 3 to 5, the numbers added in the -90° direction from the center of the graph indicate gain (unit: dBi).

[0043] The antenna device 10A according to the first embodiment and the antenna device according to the first comparative example will be compared with each other with reference to FIGS.

[0044] In the antenna device 10A according to the first embodiment, radiation of radio waves from the first radiating element 310A toward the side where the first director element 320A is located can be guided, compared to a case where the first director element 320A is not provided. Radiation of radio waves from the first radiating element 310A toward the side where the first reflecting element 330A is located can be blocked, compared to a case where the first reflecting element 330A is not provided. Radiation of radio waves from the second radiating element 410A toward the side where the second director element 420A is located can be guided, compared to a case where the second director element 420A is not provided. Radiation of radio waves from the second radiating element 410A toward the side where the second reflecting element 430A is located can be blocked, compared to a case where the second reflecting element 430A is not provided. Therefore, as shown in FIG. 3 , in the first embodiment, the gain in the direction near 0° is higher than the gain in the direction near 180°. That is, in the first embodiment, directivity toward the negative side of the first direction X is achieved.

[0045] The antenna device 10A according to the first embodiment can block radiation of radio waves from the first radiating element 310A toward the side where the second reflecting element 430A is located, compared to when the second reflecting element 430A is not provided. The antenna device 10A according to the first embodiment can block radiation of radio waves from the second radiating element 410A toward the side where the first reflecting element 330A is located, compared to when the first reflecting element 330A is not provided. Therefore, as shown in FIG. 3 , the gain in the direction near 180° is lower in the first embodiment than in the first comparative example. That is, the directivity in the direction opposite to the negative direction of the first direction X, which is the direction of directivity, is suppressed in the first embodiment than in the first comparative example.

[0046] In the antenna device 10A according to the first embodiment, radiation of radio waves from the first radiating element 310A can be guided toward the side where the second director element 420A is located, compared to when the second director element 420A is not provided. Radiation of radio waves from the second radiating element 410A can be guided toward the side where the first director element 320A is located, compared to when the first director element 320A is not provided. Therefore, as shown in FIG. 5 , in the first embodiment, the gain in the direction near 90° and the gain in the direction near −90° are higher than in the first comparative example. That is, in the first embodiment, the directivity toward the lateral side with respect to the negative direction of the first direction X, which is the direction of directivity, is improved, compared to the first comparative example.

[0047] In the first embodiment, the multiple antenna elements are arranged in a direction intersecting the arrangement direction of the radiating element and at least one parasitic element in at least one of the multiple antenna elements. Specifically, in the first embodiment, the first antenna element 300A and the second antenna element 400A are arranged substantially parallel to the second direction Y. A comparison between the first embodiment and the first comparative example reveals that at least one of the induction and shielding of radio wave radiation from the radiating element in one of the first antenna element 300A and the second antenna element 400A can be performed by the parasitic element in the other of the first antenna element 300A and the second antenna element 400A. Therefore, by appropriately arranging the first antenna element 300A and the second antenna element 400A, a desired radiation pattern can be achieved for the antenna device 10A.

[0048] The arrangement of the first antenna element 300A and the second antenna element 400A is not limited to the arrangement according to the embodiment. For example, the position of the first radiating element 310A in the first direction X and the position of the second radiating element 410A in the first direction X may be offset from each other in the first direction X. The position of the first director element 320A in the first direction X and the position of the second director element 420A in the first direction X may be offset from each other in the first direction X. The position of the first reflecting element 330A in the first direction X and the position of the second reflecting element 430A in the first direction X may be offset from each other in the first direction X.

[0049] In the first embodiment, when viewed from the third direction Z, the arrangement direction of the first radiating element 310A, the first waveguide element 320A, and the first reflecting element 330A and the arrangement direction of the second radiating element 410A, the second waveguide element 420A, and the second reflecting element 430A are substantially parallel to the first direction X. Therefore, the directivity of the first antenna element 300A and the directivity of the second antenna element 400A can be aligned in substantially the same direction.

[0050] 2 and 3, the operating frequency of the first antenna element 300A and the operating frequency of the second antenna element 400A are substantially the same. When these operating frequencies are substantially the same, the influence of the parasitic element of the other of the first antenna element 300A and the second antenna element 400A on the radio waves from the radiating element of one of the first antenna element 300A and the second antenna element 400A can be increased compared to when these operating frequencies are different. However, the operating frequency of the first antenna element 300A and the operating frequency of the second antenna element 400A may be different from each other.

[0051] 2 and 3, the distance in the first direction X between the first radiating element 310A and the second radiating element 410A is equal to or less than the wavelength of the operating frequency of the first antenna element 300A or approximately ¼ of the wavelength of the operating frequency of the second antenna element 400A. When the distance is equal to or less than approximately ¼ of the operating frequency, the influence of the parasitic element of the other of the first and second antenna elements 300A and 400A on radio waves from one of the radiating elements of the first and second antenna elements 300A and 400A can be increased compared to when the distance is longer than approximately ¼ of the operating frequency. However, the distance may be longer than approximately ¼ of the wavelength of the operating frequency.

[0052] Fig. 4 is a perspective view showing an antenna device according to Modification 1, which has the same configuration as the antenna device 10 shown in Fig. 1 but with inner case 500A, outer case 600A, and outer pad 602A removed. Hereinafter, the antenna device according to Modification 1 shown in Fig. 4 will be referred to as antenna device 10A1. Fig. 5 is a graph showing the directivity at 2400 MHz in the horizontal plane of antenna device 10A1 according to Modification 1 and the directivity at 2400 MHz in the horizontal plane of an antenna device according to Comparative Example 1. Antenna device 10A1 according to Modification 1 is similar to antenna device 10A according to Embodiment 1, except that second antenna element 400A1 is composed of second radiating element 410A and second reflecting element 430A, and does not have second director element 420A.

[0053] With reference to FIGS. 4 and 5, the antenna device 10A1 according to the first modification and the antenna device according to the first comparative example will be compared.

[0054] In the antenna device 10A1 according to the first modification, radiation of radio waves from the first radiating element 310A toward the side where the first director element 320A is located can be guided more effectively than in a case where the first director element 320A is not provided. Radiation of radio waves from the first radiating element 310A toward the side where the first reflecting element 330A is located can be blocked more effectively than in a case where the first reflecting element 330A is not provided. Radiation of radio waves from the second radiating element 410A toward the side where the second reflecting element 430A is located can be blocked more effectively than in a case where the second reflecting element 430A is not provided. Therefore, as shown in FIG. 5 , in the first modification, the gain in the direction near 0° is higher than the gain in the direction near 180°. That is, in the first modification, directivity toward the negative side of the first direction X is achieved.

[0055] The antenna device 10A1 according to the first modification can block radiation of radio waves from the first radiating element 310A toward the side where the second reflecting element 430A is located, compared to when the second reflecting element 430A is not provided. The antenna device 10A1 according to the first modification can block radiation of radio waves from the second radiating element 410A toward the side where the first reflecting element 330A is located, compared to when the first reflecting element 330A is not provided. Therefore, as shown in FIG. 5 , the gain in the direction near 180° is lower in the first modification than in the first comparative example. That is, the directivity in the direction opposite to the negative direction of the first direction X, which is the direction of directivity, is suppressed in the first modification compared to the first comparative example.

[0056] In antenna device 10A1 according to Modification 1, radiation of radio waves from second radiating element 410A can be guided toward the side where first director element 320A is located, compared to a case where first director element 320A is not provided. Therefore, as shown in Fig. 5, Modification 1 has a higher gain in the direction near 90° compared to Comparative Example 1. That is, Modification 1 has improved directivity to the side with respect to the negative direction of first direction X, which is the direction of directivity, compared to Comparative Example 1.

[0057] Fig. 6 is a perspective view showing an antenna device according to Modification 2, which has the same configuration as the antenna device 10 shown in Fig. 1 but with the inner case 500A, outer case 600A, and outer pad 602A removed. Hereinafter, the antenna device according to Modification 2 shown in Fig. 6 will be referred to as antenna device 10A2. Fig. 7 is a graph showing the directivity at 2400 MHz in the horizontal plane of the antenna device 10A2 according to Modification 2 and the directivity at 2400 MHz in the horizontal plane of the antenna device according to Comparative Example 1. The antenna device 10A2 according to Modification 2 is similar to the antenna device 10A according to Embodiment 1, except that the second antenna element 400A2 is composed of a second radiating element 410A and a second waveguide element 420A and does not have a second reflecting element 430A.

[0058] With reference to FIGS. 6 and 7, the antenna device 10A2 according to the second modification and the antenna device according to the first comparative example will be compared.

[0059] In the antenna device 10A2 according to the second modification, radiation of radio waves from the first radiating element 310A toward the side where the first director element 320A is located can be guided, compared to a case where the first director element 320A is not provided. Radiation of radio waves from the first radiating element 310A toward the side where the first reflecting element 330A is located can be blocked, compared to a case where the first reflecting element 330A is not provided. Radiation of radio waves from the second radiating element 410A toward the side where the second director element 420A is located can be guided, compared to a case where the second director element 420A is not provided. Therefore, as shown in FIG. 7 , in the second modification, the gain in the direction near 0° is higher than the gain in the direction near 180°. That is, in the second modification, directivity toward the negative side of the first direction X is achieved.

[0060] The antenna device 10A2 according to the second modification can block radiation of radio waves from the second radiating element 410A toward the side where the first reflecting element 330A is located, compared to when the first reflecting element 330A is not provided. Therefore, as shown in Fig. 7, the gain in the direction near 180° is lower in the second modification than in the first comparative example. That is, the directivity in the direction opposite to the negative direction of the first direction X, which is the direction of directivity, is suppressed in the second modification compared to the first comparative example.

[0061] In antenna device 10A2 according to Modification 2, radiation of radio waves from first radiating element 310A can be guided toward the side where second director element 420A is located, compared to when second director element 420A is not provided. Radiation of radio waves from second radiating element 410A can be guided toward the side where first director element 320A is located, compared to when first director element 320A is not provided. Therefore, as shown in FIG. 7 , Modification 2 has higher gain in the direction near 90° and in the direction near −90°, compared to Comparative Example 1. That is, Modification 2 has improved directivity toward the lateral side relative to the negative direction of first direction X, which is the direction of directivity, compared to Comparative Example 1.

[0062] Fig. 8 is a perspective view showing a state in which the inner case, outer case, and outer pad are removed from the antenna device according to embodiment 2. Hereinafter, the antenna device according to embodiment 2 shown in Fig. 8 will be referred to as antenna device 10B. The antenna device 10B according to embodiment 2 is similar to the antenna device 10A according to embodiment 1 except for the following points.

[0063] The substrate 200B is mounted on the upper surface side of the base 100B. As in the first embodiment, the substrate 200B has a substantially square shape having a first corner 202B, a second corner 204B, a third corner 206B, and a fourth corner 208B when viewed from the third direction Z. The substrate 200B is attached to the base 100B with six substrate mounting screws 210B. However, the shape of the substrate 200B is not limited to this example.

[0064] The first antenna element 300B according to the second embodiment has a first radiating element 310B, a first director element 322B, a second director element 324B, and a first reflecting element 330B. When viewed from the third direction Z, the first radiating element 310B, the first director element 322B, the second director element 324B, and the first reflecting element 330B are arranged substantially parallel to the first direction X.

[0065] The first waveguide element 322B is disposed on the negative side of the second waveguide element 324B in the first direction X. The second waveguide element 324B is disposed on the positive side of the first waveguide element 322B in the first direction X. The first waveguide element 322B and the second waveguide element 324B are integrated via a first mounting portion 326B. The first mounting portion 326B is provided between the lower end of the first waveguide element 322B and the lower end of the second waveguide element 324B. A portion of the first mounting portion 326B that overlaps with the third corner portion 206B in the third direction Z is attached to the base 100B together with the third corner portion 206B by a board mounting screw 210B provided at the third corner portion 206B. A portion of first mounting portion 326B located on the negative side of third corner 206B in first direction X is attached to base 100B by antenna mounting screw 212B located on the negative side of third corner 206B in first direction X. However, the method of attaching first director element 322B and second director element 324B to base 100B and substrate 200B is not limited to this example.

[0066] Second mounting portion 332B is provided on the negative side of the lower end of first reflecting element 330B in the first direction X. Second mounting portion 332B is integral with first reflecting element 330B. Second mounting portion 332B is located on the positive side of fourth corner 208B in the first direction X. Second mounting portion 332B is attached to base 100B by antenna mounting screw 212B provided on the positive side of fourth corner 208B in the first direction X. However, the method of attaching first reflecting element 330B to base 100B is not limited to this example.

[0067] The first antenna element 300B according to the second embodiment has two director elements. Therefore, compared to when the first antenna element 300B has only one director element, the directivity of the first antenna element 300B in the negative direction of the first direction X can be strengthened. The first antenna element 300B may have three or more director elements. In this case, the three or more director elements are arranged, for example, substantially parallel to the first direction X.

[0068] The second antenna element 400B according to the second embodiment has a second radiating element 410B, a third waveguide element 422B, a fourth waveguide element 424B, and a second reflecting element 430B. When viewed from the third direction Z, the second radiating element 410B, the third waveguide element 422B, the fourth waveguide element 424B, and the second reflecting element 430B are arranged substantially parallel to the first direction X.

[0069] The third waveguide element 422B is disposed on the negative side of the first direction X with respect to the fourth waveguide element 424B. The fourth waveguide element 424B is disposed on the positive side of the first direction X with respect to the third waveguide element 422B. The third waveguide element 422B and the fourth waveguide element 424B are integrated via a third mounting portion 426B. The third mounting portion 426B is provided between the lower end of the third waveguide element 422B and the lower end of the fourth waveguide element 424B. A portion of the third mounting portion 426B that overlaps with the second corner portion 204B in the third direction Z is attached to the base 100B together with the second corner portion 204B by a board mounting screw 210B provided at the second corner portion 204B. A portion of the third mounting portion 426B located on the negative side of the second corner 204B in the first direction X is mounted to the base 100B by an antenna mounting screw 212B located on the negative side of the second corner 204B in the first direction X. However, the method for mounting the third waveguide element 422B and the fourth waveguide element 424B to the base 100B and the substrate 200B is not limited to this example.

[0070] A fourth mounting portion 432B is provided on the negative side of the lower end of second reflecting element 430B in the first direction X. Fourth mounting portion 432B is integral with second reflecting element 430B. Fourth mounting portion 432B is located on the positive side of first corner 202B in the first direction X. Fourth mounting portion 432B is attached to base 100B by antenna mounting screw 212B provided on the positive side of first corner 202B in the first direction X. However, the method of attaching second reflecting element 430B to base 100B is not limited to this example.

[0071] The second antenna element 400B according to the second embodiment has two director elements. Therefore, compared to when the second antenna element 400B has only one director element, the directivity of the second antenna element 400B in the negative direction of the first direction X can be strengthened. The second antenna element 400B may have three or more director elements. In this case, the three or more director elements are arranged, for example, substantially parallel to the first direction X.

[0072] In the second embodiment, when viewed from the third direction Z, the first radiating element 310B and the second radiating element 410B are arranged substantially parallel to the second direction Y. When viewed from the third direction Z, the first waveguide element 322B and the third waveguide element 422B are arranged substantially parallel to the second direction Y. When viewed from the third direction Z, the second waveguide element 324B and the fourth waveguide element 424B are arranged substantially parallel to the second direction Y. When viewed from the third direction Z, the first reflecting element 330B and the second reflecting element 430B are arranged substantially parallel to the second direction Y.

[0073] 9 is a graph showing the directivity at 2400 MHz in the horizontal plane of the antenna device 10B according to the second embodiment and the directivity at 2400 MHz in the horizontal plane of the antenna device according to the comparative example 2. The antenna device according to the comparative example 2 is similar to the antenna device 10B according to the second embodiment except that the second antenna element 400B is not provided.

[0074] The antenna device 10B according to the second embodiment and the antenna device according to the second comparative example will be compared with each other with reference to FIGS.

[0075] In the antenna device 10B according to the second embodiment, radiation of radio waves from the first radiating element 310B toward the side where the first director element 322B and the second director element 324B are located can be guided more effectively than in a case where the first director element 322B and the second director element 324B are not provided. Radiation of radio waves from the first radiating element 310B toward the side where the first reflecting element 330B is located can be blocked more effectively than in a case where the first reflecting element 330B is not provided. Radiation of radio waves from the second radiating element 410B toward the side where the third director element 422B and the fourth director element 424B are located can be guided more effectively than in a case where the third director element 422B and the fourth director element 424B are not provided. Radiation of radio waves from the second radiating element 410B toward the side where the second reflecting element 430B is located can be blocked more effectively than in a case where the second reflecting element 430B is not provided. 9, in the second embodiment, the gain in the direction near 0° is higher than the gain in the direction near 180°. That is, in the second embodiment, directivity toward the negative side of the first direction X is achieved.

[0076] In the antenna device 10B according to the second embodiment, radiation of radio waves from the first radiating element 310B can be guided toward the side where the third director element 422B and the fourth director element 424B are located, compared to a case where the third director element 422B and the fourth director element 424B are not provided. In comparison to a case where the first director element 322B and the second director element 324B are not provided, radiation of radio waves from the second radiating element 410B can be guided toward the side where the first director element 322B and the second director element 324B are located. Therefore, as shown in FIG. 9 , the second embodiment has higher gains in the direction near 90° and the direction near −90° than the second comparative example. That is, the second embodiment has improved directivity toward the lateral side relative to the negative direction of the first direction X, which is the direction of directivity, compared to the second comparative example.

[0077] In the second embodiment, the first antenna element 300B and the second antenna element 400B each have two director elements. Therefore, as shown in Fig. 9 and Fig. 3, the improvement in gain in the direction near 90° and the improvement in gain in the direction near -90° in the second embodiment compared to the comparative example 2 are more significant than the improvement in gain in the direction near 90° and the improvement in gain in the direction near -90° in the first embodiment compared to the comparative example 1.

[0078] Fig. 10 is a perspective view showing a state in which the inner case, outer case, and outer pad are removed from the antenna device according to embodiment 3. Hereinafter, the antenna device according to embodiment 3 shown in Fig. 10 will be referred to as antenna device 10C. The antenna device 10C according to embodiment 3 is similar to the antenna device 10B according to embodiment 2 except for the following points.

[0079] In the third embodiment, the substrate 200C is mounted on the upper surface side of the base 100C. When viewed from the third direction Z, the substrate 200C has a substantially rectangular shape with a pair of long sides substantially parallel to the first direction X and a pair of short sides substantially parallel to the second direction Y. When viewed from the third direction Z, the four corners of the substrate 200C are attached to the base 100C by four substrate mounting screws 210C. However, the shape of the substrate 200C is not limited to this example.

[0080] The first antenna element 300C according to the third embodiment includes a first dielectric 302C, a first radiating element 310C, a first director element 322C, a second director element 324C, and a first reflecting element 330C. The second antenna element 400C according to the third embodiment includes a second dielectric 402C, a second radiating element 410C, a third director element 422C, a fourth director element 424C, and a second reflecting element 430C. As in the second embodiment, the first radiating element 310C, the first director element 322C, the second director element 324C, and the first reflecting element 330C are arranged substantially parallel to the first direction X when viewed from the third direction Z. The second radiating element 410C, the third director element 422C, the fourth director element 424C, and the second reflecting element 430C are arranged substantially parallel to the first direction X when viewed from the third direction Z. When viewed from the third direction Z, the first radiating element 310C and the second radiating element 410C are arranged substantially parallel to the second direction Y. When viewed from the third direction Z, the first waveguide element 322C and the third waveguide element 422C are arranged substantially parallel to the second direction Y. When viewed from the third direction Z, the second waveguide element 324C and the fourth waveguide element 424C are arranged substantially parallel to the second direction Y. When viewed from the third direction Z, the first reflecting element 330C and the second reflecting element 430C are arranged substantially parallel to the second direction Y.

[0081] The first dielectric 302C is, for example, a resin. The first dielectric 302C covers at least a portion of the first radiating element 310C, the first director element 322C, the second director element 324C, and the first reflecting element 330C. The first dielectric 302C has a flat plate shape that is approximately perpendicular to the second direction Y. For example, the first dielectric 302C is a resin body that covers the conductors that constitute the first radiating element 310C, the first director element 322C, the second director element 324C, and the first reflecting element 330C. However, the first dielectric 302C may also be a resin substrate on which conductor patterns that constitute the first radiating element 310C, the first director element 322C, the second director element 324C, and the first reflecting element 330C are provided. The structure of the first dielectric 302C is not limited to this example.

[0082] In the third embodiment, the wavelength of the radio waves radiated from the first antenna element 300C can be shortened compared to when the first dielectric 302C is not provided. Therefore, in the third embodiment, the lengths in the third direction Z of each of the first radiating element 310C, the first director element 322C, the second director element 324C, and the first reflecting element 330C required to obtain radio waves of a desired wavelength can be shortened compared to when the first dielectric 302C is not provided. Therefore, in the third embodiment, the height of the antenna device 10C in the third direction Z can be reduced compared to when the first dielectric 302C is not provided.

[0083] The second dielectric 402C is, for example, a resin. The second dielectric 402C covers at least a portion of the second radiating element 410C, the third director element 422C, the fourth director element 424C, and the second reflecting element 430C. The second dielectric 402C has a flat plate shape that is approximately perpendicular to the second direction Y. For example, the second dielectric 402C is a resin body that covers the conductors that constitute the second radiating element 410C, the third director element 422C, the fourth director element 424C, and the second reflecting element 430C. However, the second dielectric 402C may also be a resin substrate on which conductor patterns that constitute the second radiating element 410C, the third director element 422C, the fourth director element 424C, and the second reflecting element 430C are provided. The structure of the second dielectric 402C is not limited to this example.

[0084] In the third embodiment, the wavelength of the radio waves radiated from the second antenna element 400C can be shortened compared to when the second dielectric 402C is not provided. Therefore, in the third embodiment, the lengths in the third direction Z of the second radiating element 410C, the third director element 422C, the fourth director element 424C, and the second reflecting element 430C required to obtain radio waves of a desired wavelength can be shortened compared to when the second dielectric 402C is not provided. Therefore, in the third embodiment, the height of the antenna device 10C in the third direction Z can be reduced compared to when the second dielectric 402C is not provided.

[0085] In the third embodiment, a dielectric is provided in both the first antenna element 300C and the second antenna element 400C. However, a dielectric may be provided in only one of the first antenna element 300C and the second antenna element 400C. Furthermore, when a dielectric is provided in both the first antenna element 300C and the second antenna element 400C, the dielectric provided in the first antenna element 300C and the dielectric provided in the second antenna element 400C may be integrated.

[0086] 11 is a graph showing the directivity at 2400 MHz in the horizontal plane of the antenna device 10C according to the third embodiment and the directivity at 2400 MHz in the horizontal plane of the antenna device according to the comparative example 3. The antenna device according to the comparative example 3 is similar to the antenna device 10C according to the third embodiment except that the second antenna element 400C is not provided.

[0087] For the same reason as that explained in the second embodiment, in the third embodiment, the gain in the direction near 0° is higher than the gain in the direction near 180°, as shown in Fig. 11. That is, in the third embodiment, directivity toward the negative side of the first direction X is realized.

[0088] 11, for the same reasons as those described in the second embodiment, the gain in the direction near 90° and the gain in the direction near −90° are higher in the third embodiment than in the comparative example 3. That is, the directivity to the lateral side of the negative direction of the first direction X, which is the direction of directivity, is improved in the third embodiment than in the comparative example 3.

[0089] Although the embodiments and modifications of the present invention have been described above with reference to the drawings, these are merely examples of the present invention, and various other configurations can also be adopted.

[0090] For example, in each embodiment and each modified example, the antenna device includes two antenna elements. However, the antenna device may include three or more antenna elements. For example, each of the three or more antenna elements includes a radiating element and at least one parasitic element arranged with the radiating element. The three or more antenna elements are arranged in a direction intersecting the arrangement direction of the radiating element and at least one parasitic element in at least one of these antenna elements. Even in this example, by appropriately arranging the three or more antenna elements, a desired radiation pattern can be achieved for the antenna device.

[0091] Furthermore, in each embodiment and each modified example, the first antenna element has both a director element and a reflector element. However, if the second antenna element has a reflector element, the first antenna element may have only a director element without a reflector element. In this example, directivity in the direction from the radiator element of the first antenna element to the director element is achieved. Furthermore, radiation of radio waves from the radiator element of the first antenna element toward the side where the reflector element of the second antenna element is located can be blocked. Therefore, compared to when the second antenna element is not provided, directivity in the direction opposite to the direction of the directivity of the first antenna element can be reduced. Alternatively, if the second antenna element has a director element, the first antenna element may have only a reflector element without a director element. In this example, directivity in the direction from the reflector element of the first antenna element to the radiator element is achieved. Furthermore, radiation of radio waves from the radiator element of the first antenna element toward the side where the director element of the second antenna element is located can be guided. Therefore, compared to a case where the second antenna element is not provided, it is possible to increase the directivity to the lateral side relative to the direction of the directivity of the first antenna element.

[0092] In each embodiment, each antenna element has one reflecting element, but each antenna element may have two or more reflecting elements.

[0093] According to the present specification, the following aspects are provided. (Aspect 1) Aspect 1 is a plurality of antenna elements, each having a radiating element and at least one parasitic element; The antenna device has a plurality of antenna elements arranged in a direction intersecting an arrangement direction of the radiating element and the at least one parasitic element in at least one of the plurality of antenna elements. According to the first aspect, at least one of the induction and shielding of radio wave radiation from a radiating element in at least one of the plurality of antenna elements can be performed by a parasitic element in at least one other of the plurality of antenna elements. Therefore, by appropriately arranging the plurality of antenna elements, a desired radiation pattern can be realized for the antenna device. (Aspect 2) Aspect 2 is the at least one parasitic element of a predetermined antenna element among the plurality of antenna elements includes a director element disposed on a predetermined side of the radiating element of the predetermined antenna element, An antenna device as described in aspect 1, wherein the at least one parasitic element of a predetermined other antenna element among the plurality of antenna elements includes a reflecting element arranged on the opposite side of the predetermined side relative to the radiating element of the predetermined other antenna element. According to the second aspect, directivity in the direction from the radiating element of the predetermined antenna element to the director element is realized. Furthermore, radiation of radio waves from the radiating element of the predetermined antenna element toward the side where the reflecting element of the predetermined other antenna element is located can be blocked. Therefore, compared to when the predetermined other antenna element is not provided, directivity in the opposite direction to the direction of the directivity of the predetermined antenna element can be suppressed. According to the second aspect, directivity in the direction from the reflecting element of the predetermined other antenna element to the radiating element is realized. Furthermore, radiation of radio waves from the radiating element of the predetermined other antenna element toward the side where the director element of the predetermined antenna element is located can be guided. Therefore, compared to when the predetermined antenna element is not provided, directivity to the side of the direction of the directivity of the predetermined other antenna element can be improved. (Aspect 3) Aspect 3 is The at least one parasitic element of the predetermined antenna element further includes a reflecting element disposed on the opposite side of the predetermined side with respect to the radiating element of the predetermined antenna element; An antenna device according to aspect 2, wherein the at least one parasitic element of the predetermined other antenna element further includes a director element arranged on the predetermined side relative to the radiating element of the predetermined other antenna element. According to the third aspect, directivity in the direction from the reflecting element to the director element in a predetermined antenna element is realized. Furthermore, it is possible to guide radiation of radio waves from the radiating element of the predetermined antenna element toward the side where the director element of the predetermined other antenna element is located. Therefore, compared to when the predetermined other antenna element is not provided, it is possible to improve the directivity toward the lateral side relative to the direction of the directivity of the predetermined antenna element. According to the third aspect, directivity in the direction from the reflecting element to the director element in the predetermined other antenna element is realized. Furthermore, it is possible to block radiation of radio waves from the radiating element of the predetermined other antenna element toward the side where the reflecting element of the predetermined other antenna element is located. Therefore, it is possible to suppress the directivity in the opposite direction relative to the direction of the directivity of the predetermined other antenna element compared to when the predetermined antenna element is not provided. (Aspect 4) Aspect 4 is The antenna device according to any one of aspects 1 to 3, wherein the radiating elements and the at least one parasitic element in the plurality of antenna elements are arranged in substantially parallel directions. According to the fourth aspect, the directivities of the multiple antenna elements can be aligned in approximately the same direction. (Aspect 5) Aspect 5 is The antenna device according to any one of aspects 1 to 4, wherein the operating frequencies of the plurality of antenna elements are substantially the same. According to aspect 5, the influence of the radio waves from the radiating element of at least one antenna element on the parasitic element of at least one other antenna element can be increased compared to when the operating frequencies of multiple antenna elements are different from each other. (Aspect 6) Aspect 6 is The antenna device according to any one of aspects 1 to 5, wherein the distance between the radiating element in a predetermined antenna element among the plurality of antenna elements and the radiating element in a predetermined other antenna element among the plurality of antenna elements is equal to or less than approximately 1 / 4 of the wavelength of the operating frequency of the predetermined antenna element or the wavelength of the operating frequency of the predetermined other antenna element. According to aspect 6, the influence of the radio waves from the radiating element of at least one antenna element by the parasitic element of at least one other antenna element can be increased compared to when the distance is longer than 1 / 4 of the operating frequency. (Aspect 7) Aspect 7 is The antenna device according to any one of aspects 1 to 6, further comprising a dielectric covering at least a portion of the radiating element and the at least one parasitic element in at least one antenna element among the plurality of antenna elements. According to the seventh aspect, the wavelength of the radio wave radiated from the antenna element provided with the dielectric can be shortened compared to when no dielectric is provided. Therefore, the length of the parasitic element for obtaining radio waves of a desired wavelength can be shortened compared to when no dielectric is provided. Therefore, the height of the antenna device can be reduced compared to when no dielectric is provided. [Explanation of symbols]

[0094] 10, 10A, 10A1, 10A2, 10B, 10C Antenna device 100A, 100B, 100C base 102A Mounting seal material 112A Rib 200A, 200B, 200C board 202A,202B 1st corner 204A,204B 2nd corner 206A,206B 3rd corner 208A,208B 4th corner 210A, 210B, 210C PCB mounting screws 212B Antenna mounting screw 300A, 300B, 300C First antenna element 302C First Dielectric 310A, 310B, 310C First radiating element 320A First director element 322A First Mounting Section 322B, 322C First director element 324B, 324C Second waveguide element 326B First mounting part 330A, 330B, 330C First reflecting element 332A, 332B Second mounting part 400A, 400A1, 400A2, 400B, 400C Second antenna element 402C Second Dielectric 410A, 410B, 410C Second radiating element 420A Second director element 422A 3rd mounting part 422B, 422C Third waveguide element 424B, 424C Fourth waveguide element 426B 3rd mounting part 430A, 430B, 430C Second reflecting element 432A, 432B 4th mounting part 500A inner case 502A Inner Pad 510A Case Mounting Screw 600A outer case 602A Outer Pad 700A Fasteners 710A Fastening Screw 720A Washer 730A Holder X 1st direction Y Second direction Z 3rd direction

Claims

1. a plurality of antenna elements, each having a radiating element and at least one parasitic element; The plurality of antenna elements are arranged in a direction intersecting an arrangement direction of the radiating element and the at least one parasitic element in at least one of the plurality of antenna elements.

2. the at least one parasitic element of a predetermined antenna element among the plurality of antenna elements includes a director element disposed on a predetermined side of the radiating element of the predetermined antenna element, 2. The in-vehicle antenna device according to claim 1, wherein the at least one parasitic element of a predetermined other antenna element among the plurality of antenna elements includes a reflector arranged on the opposite side of the predetermined side with respect to the radiating element of the predetermined other antenna element.

3. The at least one parasitic element of the predetermined antenna element further includes a reflecting element disposed on the opposite side of the predetermined side with respect to the radiating element of the predetermined antenna element; 3. The in-vehicle antenna device according to claim 2, wherein the at least one parasitic element of the predetermined other antenna element further includes a director element disposed on the predetermined side with respect to the radiating element of the predetermined other antenna element.

4. 4. The vehicle-mounted antenna device according to claim 1, wherein the radiating elements and the at least one parasitic element in the plurality of antenna elements are arranged in substantially parallel directions.

5. 5. The vehicle-mounted antenna device according to claim 1, wherein the operating frequencies of the plurality of antenna elements are substantially the same.

6. 6. The in-vehicle antenna device according to claim 1, wherein a distance between the radiating element in a predetermined antenna element among the plurality of antenna elements and the radiating element in a predetermined other antenna element among the plurality of antenna elements is equal to or less than approximately ¼ of a wavelength of an operating frequency of the predetermined antenna element or a wavelength of an operating frequency of the predetermined other antenna element.

7. The in-vehicle antenna device according to any one of claims 1 to 6, further comprising a dielectric covering at least a portion of the radiating element and the at least one parasitic element in at least one antenna element among the plurality of antenna elements.

Images