Antenna device and radar device

Abstract

In this antenna device, a patch antenna is configured by providing a ground plane and a plurality of radiating elements on a board. A dielectric layer is fixed to the upper surfaces of the radiating elements and to the board so as to cover the plurality of radiating elements. A dielectric member is disposed on the dielectric layer. The dielectric member comprises: a plate-shaped part spaced apart from the dielectric layer; a plurality of protrusions protruding from the plate-shaped part toward respective ones of the plurality of radiating elements; and fixture parts that are disposed in areas not overlapping with the plurality of radiating elements in a plan view and that protrude from the plate-shaped part toward the board. The relative positions of the plurality of protrusions with respect to the radiating elements are fixed by means of the fixture parts.

Description

[Technical field]

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

[0002] A dielectric loaded array antenna in which a dielectric block is placed on each of a plurality of patch antennas is known (Patent Document 1). When a dielectric block is loaded on a patch antenna, the aperture efficiency of each unit antenna constituting the array antenna increases. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 1-243605 Summary of the Invention [Problem to be solved by the invention]

[0004] When manufacturing a dielectric loaded array antenna, it is necessary to place the dielectric block on each of the unit antennas with high positional accuracy. In addition, when the dielectric blocks are individually attached to the antenna substrate with adhesive, there is a concern that the dielectric block may fall off the antenna substrate due to vibration or impact.

[0005] An object of the present invention is to provide an antenna device capable of disposing a dielectric material with high positional accuracy for each of a plurality of radiating elements, and another object of the present invention is to provide a radar device equipped with the antenna device. [Means for solving the problem]

[0006] According to one aspect of the present invention, A substrate; a ground plane provided on the substrate; a plurality of radiating elements provided on the substrate, the radiating elements constituting a patch antenna together with the ground plane; a dielectric layer attached to the substrate so as to cover the plurality of radiating elements; a dielectric member disposed on the dielectric layer; Equipped with The dielectric member is a plate-like portion disposed at a distance from the dielectric layer; a plurality of protrusions protruding from the plate-like portion toward each of the plurality of radiating elements; a fixing portion that is disposed in an area that does not overlap with the plurality of radiating elements in a plan view and that protrudes from the plate-like portion toward the substrate; Including, There is provided an antenna device in which the relative positions of the plurality of protrusions with respect to the plurality of radiating elements are fixed via the fixing portion.

[0007] According to another aspect of the invention, The antenna device as described above; a signal generating unit for supplying a transmission signal to a part of the plurality of radiating elements for transmission; a signal processing unit that performs signal processing of the transmission signal and a reception signal received by the remaining reception radiating elements among the plurality of radiating elements; There is provided a radar device comprising: Effect of the Invention

[0008] The protrusions function as a dielectric block provided for the radiating element. Since the multiple protrusions protrude from the plate-shaped portion, the positional accuracy of the protrusions and the radiating element can be improved compared to the case where a dielectric block is individually provided for each radiating element. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1A is a perspective view of an antenna device according to a first embodiment, and FIGS. 1B and 1C are perspective views of a substrate and a dielectric member, respectively, used in the antenna device according to the first embodiment. [Diagram 2]FIG. 2A is a cross-sectional view of the antenna device according to the first preferred embodiment, and FIG. 2B is a cross-sectional view of an antenna device according to another configuration example. [Diagram 3] 3A and 3B are cross-sectional views of one radiating element and the surrounding area where a protrusion is arranged in an antenna device according to the comparative example and the first embodiment, respectively, and FIGS. 3C and 3D are graphs showing the simulation results of the reflection coefficient S11 of one radiating element of the antenna device according to the comparative example (FIG. 3A) and the first embodiment (FIG. 3B), respectively. [Figure 4] FIG. 4A is a cross-sectional view of the antenna device being simulated, FIG. 4B is a graph showing the simulation results of the gain when the height dimension H of the protrusion is changed, and FIG. 4C is a graph showing the simulation results of the gain when the thickness t of the plate-shaped portion is changed. [Diagram 5] 5A, 5B, and 5C are perspective views of a dielectric member, a substrate, and a case used in the radar device according to the second embodiment, respectively. [Figure 6] FIG. 6 is a cross-sectional view of a radar device according to the second embodiment. [Figure 7] FIG. 7 is a block diagram of a radar device according to the second embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] [First Example] An antenna device according to a first embodiment will be described with reference to FIGS. 1A to 4C. Fig. 1A is a perspective view of an antenna device according to a first embodiment, and Fig. 1B and Fig. 1C are perspective views of a substrate 10 and a dielectric member 30 used in the antenna device according to the first embodiment, respectively. Fig. 1C shows a state in which the dielectric member 30 shown in Fig. 1A is turned upside down.

[0011] A plurality of radiating elements 12 are arranged on the surface of the substrate 10, and a dielectric layer 17 is fixed to the surface of the substrate 10 and to the plurality of radiating elements 12. Here, "fixed" means that it is firmly and securely attached and remains in a fixed position. A ground plane 11 is arranged on the inner layer of the substrate 10. Each of the plurality of radiating elements 12 and the ground plane 11 form a patch antenna. The plurality of radiating elements 12 are arranged in a matrix and operate as an array antenna.

[0012] The dielectric layer 17 is formed, for example, from the same dielectric material as that of the substrate 10. Alternatively, the dielectric layer 17 may be formed from a material different from that of the substrate 10, for example, a resist material.

[0013] The dielectric member 30 (FIG. 1C) includes a plate-shaped portion 31 having a plate-like shape, a plurality of protruding portions 32, and a fixing portion 33. The dielectric member 30 is made of a resin material such as liquid crystal polymer (LCP). The plate-shaped portion 31 is disposed at a distance from the surface of the substrate 10 to which the dielectric layer 17 is fixed. The plurality of protruding portions 32 protrude from the plate-shaped portion 31 toward the plurality of radiating elements 12. The shape of each of the protruding portions 32 in a plan view is a square or a rectangle. In a plan view, each of the plurality of protruding portions 32 is approximately the same size as the radiating element 12 or larger than the radiating element 12, and includes each of the radiating elements 12. The radiating element 12, the ground plane 11, and the protruding portion 32 form a dielectrically loaded patch antenna, and an electromagnetic field generated by excitation of the radiating element 12 is coupled to the protruding portion 32.

[0014] The fixing portion 33 is disposed in a region that does not overlap with a region in which the multiple protrusions 32 are disposed in a plan view, and protrudes from the plate-shaped portion 31 toward the substrate 10. For example, the shape of the plate-shaped portion 31 in a plan view is a square or a rectangle, and the fixing portion 33 is disposed along two opposing edges of the square or rectangle. The multiple protrusions 32 are disposed inside the convex hull of the fixing portion 33 in a plan view. Here, the convex hull means the smallest convex polygon that includes the fixing portion 33 in a plan view.

[0015] The position of the dielectric member 30 relative to the substrate 10 is fixed via the fixing portion 33. For example, the tip surface of the fixing portion 33 is adhered to the surface of the dielectric layer 17 with an adhesive. As a result, the relative positions of the multiple protrusions 32 with respect to the radiating element 12 are fixed via the fixing portion 33.

[0016] 2A is a cross-sectional view of an antenna device according to a first embodiment. A plurality of radiating elements 12 are arranged on a surface of a substrate 10, and a ground plane 11 is arranged on an inner layer. Furthermore, another ground plane 14 is arranged on the opposite surface (back surface) of the substrate 10. A plurality of feed lines 13 are arranged between the ground planes 11 and 14. The plurality of feed lines 13 are each connected to the plurality of radiating elements 12 through vias 15 that penetrate the ground plane 11. A dielectric layer 17 is fixed to the upper surfaces of the plurality of radiating elements 12 and the upper surface of the substrate 10.

[0017] The fixing portion 33 of the dielectric member 30 is adhered to the dielectric layer 17 via an adhesive layer 40. A plurality of protrusions 32 protrude from the plate-like portion 31 toward the plurality of radiating elements 12, respectively. The tip of each of the protrusions 32 contacts the dielectric layer 17. Note that due to deformation such as warping of the plate-like portion 31 of the dielectric member 30 or warping of the substrate 10, a minute gap that is not filled with dielectric may be generated between the tip of the protrusion 32 and the dielectric layer 17.

[0018] Fig. 2B is a cross-sectional view of an antenna device according to another configuration example of Example 1. In the antenna device shown in Fig. 2A, the fixing portion 33 of the dielectric member 30 is adhered to the substrate 10 by an adhesive layer 40. In contrast, in the antenna device shown in Fig. 2B, the fixing portion 33 is fixed to the substrate 10 by a fastener such as a screw 41.

[0019] The dielectric member 30 is integrally molded by, for example, injection molding. When the dielectric member 30 is integrally molded, the plate-shaped portion 31, the protruding portion 32, and the fixing portion 33 are formed of the same resin. The protruding portion 32 may be formed of a resin different from that of the plate-shaped portion 31 and the fixing portion 33. In this case, two-color molding (molding of different materials) may be applied to the production of the dielectric member 30.

[0020] Next, with reference to FIGS. 3A to 3D, a description will be given of the excellent effects obtained by providing the dielectric layer 17 (FIG. 2) in the antenna device according to the first preferred embodiment.

[0021] 3A and 3B are cross-sectional views of one radiating element 12 and the vicinity of the protrusion 32 of the antenna device according to the comparative example and the first embodiment, respectively. In the first embodiment (FIG. 3B), a dielectric layer 17 is fixed to the surface of the substrate 10 so as to cover the radiating element 12. The distance between the dielectric layer 17 and the tip of the protrusion 32 is marked as G. In contrast, in the comparative example (FIG. 3A), the dielectric layer 17 is not arranged and the radiating element 12 is exposed. The distance between the substrate 10 and the protrusion 32 is marked as G.

[0022] 3C and 3D are graphs showing the simulation results of the reflection coefficient S11 of one radiating element 12 of the antenna device according to the comparative example (FIG. 3A) and the first embodiment (FIG. 3B), respectively. The horizontal axis represents frequency in units of [GHz], and the vertical axis represents reflection coefficient S11 in units of [dB]. In the simulation, parameters other than the spacing G are set to be the same for the comparative example and the first embodiment. Various parameters are adjusted so that the resonant frequency of the radiating element 12 becomes approximately 79 GHz. The thin solid line, dashed line, and thick solid line in the graphs of FIG. 3C and FIG. 3D respectively show the reflection coefficient S11 when the spacing G is 0 mm, 0.05 mm, and 0.1 mm.

[0023] In both the comparative example and the first embodiment, as the gap G becomes wider, the reflection coefficient S11 becomes larger. That is, the antenna characteristics deteriorate. However, the degree of deterioration of the antenna characteristics (the degree to which the reflection coefficient S11 increases) is smaller in the first embodiment than in the comparative example. The reason why the degree of deterioration of the antenna characteristics of the antenna device according to the first embodiment is smaller than in the comparative example is as follows.

[0024] By adhering the dielectric layer 17 to the surfaces of the radiating element 12 and the substrate 10, even if a gap occurs, the variation in the dielectric constant distribution in the space very close to the radiating element 12 is reduced. Therefore, the disturbance of the electromagnetic field very close to the radiating element 12 is suppressed. As a result, the degree of degradation of the antenna characteristics is reduced. In this way, by providing the dielectric layer 17, the influence of a gap that may occur between the protrusion 32 and the radiating element 12 due to warping of the substrate 10, etc. is mitigated.

[0025] In order to suppress deterioration of the antenna characteristics, it is preferable to configure the gap G as narrow as possible, and it is most preferable to configure the gap G to be 0. For example, it is most preferable to configure the gap G to be 0, that is, the tip of the protrusion 32 is in contact with the dielectric layer 17. Alternatively, when the tip of the protrusion 32 is not in contact with the dielectric layer 17, it is preferable that the gap G is 0.1 mm or less.

[0026] 4A, 4B, and 4C, preferred dimensions of the plate-like portion 31 and the protruding portion 32 of the dielectric member 30 will be described. The antenna gain was obtained by simulation while changing the thickness of the plate-like portion 31 and the dimension in the height direction of the protruding portion 32.

[0027] 4A is a cross-sectional view of an antenna device to be simulated. A protrusion 32 protrudes from a plate-like portion 31 toward a radiating element 12, and the protrusion 32 is in contact with a dielectric layer 17. The relative dielectric constant ε rThe dimensions of the radiating element 12 are adjusted so that the resonant frequency of the radiating element 12 is 79 GHz. The thickness of the plate-like portion 31 is marked as t, and the dimension of the protrusion 32 in the height direction is marked as H. The wavelength in the plate-like portion 31 and the protrusion 32 corresponding to the center frequency of the operating frequency band of the antenna device is marked as λ d For example, the resonant frequency of the radiating element 12 can be adopted as the center frequency of the operating frequency band of the antenna device.

[0028] 4B is a graph showing the simulation results of the gain when the dimension H in the height direction of the protrusion 32 is changed. The horizontal axis represents H / λ d The vertical axis represents the gain in units of dBi. The frequency at which the radiating element 12 is excited is 79 GHz, and the thickness t of the plate-shaped portion 31 is 0.5×λ d The gain increases as the height dimension H of the protrusion 32 increases. To achieve a gain of 10 dBi or more, the height dimension H is set to 0.4×λ d It is preferable to set the number of times to more than this.

[0029] If the height dimension H is too large, the protrusion 32 becomes long and needle-like, and the mechanical strength decreases. d Even if the height dimension H is made larger, the gain is hardly changed. Increasing the height dimension H too much will have a disadvantage of reducing the mechanical strength, outweighing the advantage of improving the gain. Therefore, in order to ensure sufficient mechanical strength, the height dimension H is set to 2×λ d It is preferable to do the following:

[0030] 4C is a graph showing the results of a simulation of the gain when the thickness t of the plate-like portion 31 is changed. The horizontal axis is t / λ d The vertical axis represents the gain in units of dBi. The frequency at which the radiating element 12 is excited is 79 GHz, and the height H of the protrusion 32 is 0.46×λ d It was decided.

[0031] It can be seen that when the thickness t of the plate-like portion 31 is increased, peaks and valleys of the gain appear alternately and repeatedly. d As an example, in order to ensure a gain equal to or greater than a value 1 dB lower than the maximum value of the gain, the thickness t of the plate-shaped portion 31 is set to (n-0.1) × (λ d / 2) or more and (n+0.3)×(λ d / 2), where n is an integer of 1 or more.

[0032] Next, the excellent effects of the first embodiment will be described. In the first embodiment, the dielectric member 30 (FIG. 1C) is produced by integral molding or two-color molding. This makes it easy to improve the accuracy of the relative positions of the multiple protrusions 32 and the fixed portion 33. By positioning the fixed portion 33 with high accuracy relative to the multiple radiating elements 12 (FIG. 1B) and fixing the dielectric member 30 to the substrate 10, it is easy to improve the positional accuracy of the multiple radiating elements 12 and the multiple protrusions 32. As a result, an excellent effect is obtained in that the variation in antenna characteristics of the dielectrically loaded patch antenna element including each of the multiple radiating elements 12 is suppressed.

[0033] Furthermore, the bonding area between the fixing portion 33 and the dielectric layer 17 (FIG. 2A) can be increased without being restricted by the dimensions of each of the multiple protrusions 32. By increasing the bonding area, the dielectric member 30 can be firmly fixed to the substrate 10. This has the excellent effect of making it difficult for the protrusions 32 to fall off due to vibration or impact. In particular, in a millimeter wave band antenna device, the dielectric block loaded on the radiating element 12 becomes smaller, and therefore the effect of using the dielectric member 30 according to the first embodiment is remarkable.

[0034] When the configuration of the first embodiment is adopted, a gap that is not filled with dielectric may occur between the protruding portion 32 and the radiating element 12 as shown in Fig. 3B. In the first embodiment, since the dielectric layer 17 is fixed onto the radiating element 12, even if a gap occurs between the protruding portion 32 and the radiating element 12 as described with reference to Fig. 3D, the deterioration of the antenna characteristics can be suppressed.

[0035] Furthermore, in the first embodiment, the protruding portion 32 is larger than the radiating element 12 (FIG. 2A) in a plan view and encompasses the radiating element 12. This provides the excellent effect that the electromagnetic field generated by exciting the radiating element 12 is stably coupled to the protruding portion 32. It is preferable that the protruding portion 32 has a dimension that causes resonance in the operating frequency band of the antenna device. This makes it possible to achieve a high antenna gain.

[0036] Next, an antenna device according to a modification of the first embodiment will be described. In the first embodiment, the dielectric member 30 is made by integral molding or two-color molding, but may be made by other methods. For example, each of the multiple protrusions 32 may be welded to the plate-like portion 31. Alternatively, each of the multiple protrusions 32 may be adhered to the plate-like portion 31 using an adhesive. In this case, it is preferable to weld or adhere the multiple dielectric blocks to the plate-like portion 31 while they are placed in a positioning mold.

[0037] In the first embodiment, the shape of each of the protrusions 32 (FIG. 1C) in plan view is a square or a rectangle, but it may be another shape, such as a circle, an ellipse, or a polygon with rounded corners.

[0038] In the first embodiment, the tip of the protrusion 32 contacts the dielectric layer 17, or a gap is formed between them. A small amount of adhesive may be placed between the protrusion 32 and the dielectric layer 17. If the adhesive protrudes outward from the side surface of the protrusion 32, the effective shape of the dielectric block loaded on the radiating element 12 changes, causing the antenna characteristics to fluctuate. In order to suppress the fluctuation of the antenna characteristics, it is preferable to apply an amount of adhesive that does not protrude outward from the side surface of the protrusion 32. Since the radiating element 12 is covered with the dielectric layer 17 (FIG. 2A), the effect of the adhesive on the antenna characteristics is reduced compared to a configuration in which the adhesive is in direct contact with the radiating element 12.

[0039] In the first embodiment, two fixing parts 33 (FIG. 1C) long in one direction are arranged to sandwich the region in which the multiple protrusions 32 are provided in a plan view, but fixing parts 33 of other shapes may be arranged. For example, the shape of fixing part 33 in a plan view may be a U-shape that surrounds the region in which the multiple protrusions 32 are arranged from three sides, or a shape that surrounds it seamlessly from all four sides. In order to stably fix dielectric member 30 to substrate 10, it is preferable that the multiple protrusions 32 are included in the convex hull of fixing part 33 in a plan view.

[0040] [Second Example] Next, a radar device according to a second embodiment will be described with reference to Figures 5A to 7. The radar device according to the second embodiment is equipped with the antenna device according to the first embodiment or a modification thereof.

[0041] 5A, 5B, and 5C are perspective views of a dielectric member 30, a substrate 10, and a case 60 used in a radar device according to the second embodiment, respectively. A plurality of radiating elements 12 are arranged on the substrate 10 (FIG. 5B). Four radiating elements 12 constitute one series-fed array antenna 20, and six series-fed array antennas 20 are arranged on the substrate 10. In the six series-fed array antennas 20, the arrangement directions of the plurality of radiating elements 12 in the series-fed array antenna 20 are parallel to each other. Two of the six series-fed array antennas 20 are transmitting array antennas 20Tx, and the remaining four series-fed array antennas 20 are receiving array antennas 20Rx.

[0042] The dielectric member 30 (FIG. 5A), like the dielectric member 30 (FIG. 1C) used in the antenna device according to the first embodiment, includes a plate-shaped portion 31, a plurality of protruding portions 32, and a fixed portion 33. The plurality of protruding portions 32 are arranged corresponding to the plurality of radiating elements 12 arranged on the substrate 10. The fixed portion 33 is arranged without interruption along the edge of the plate-shaped portion 31. Therefore, the fixed portion 33 surrounds the area where the plurality of protruding portions 32 are arranged on all four sides.

[0043] The case 60 (FIG. 5C) includes a plate-shaped bottom portion 62 and a side wall portion 63 rising from the edge of the bottom portion 62. The upper surface of the side wall portion 63 includes a support surface 61 located on a common imaginary plane. The case 60 is formed of, for example, metal.

[0044] 6 is a cross-sectional view of a radar device according to the second embodiment. A high-frequency circuit element 50 is mounted on the back surface of the substrate 10 (the surface opposite to the surface facing the plate-shaped portion 31 of the dielectric member 30). The high-frequency circuit element 50 is connected to the radiating element 12 via a feed line 13 (FIG. 2A) arranged in the substrate 10. The peripheral portion of the back surface of the substrate 10 is supported by a support surface 61 of the case 60, thereby fixing the substrate 10 to the case 60. The support surface 61 extends beyond the edge of the substrate 10 outward in a plan view. The high-frequency circuit element 50 is accommodated between a bottom 62 of the case 60 and the substrate 10.

[0045] The fixing portion 33 of the dielectric member 30 is adhered to the support surface 61, whereby the dielectric member 30 is fixed to the case 60. In the first embodiment (FIG. 2A), the dielectric member 30 is directly fixed to the substrate 10, but in the second embodiment, the position of the dielectric member 30 relative to the substrate 10 is fixed via the case 60. In a plan view, the plate-like portion 31 has a size sufficient to include the plurality of radiating elements 12 and the high-frequency circuit element 50.

[0046] Fig. 7 is a block diagram of a radar device according to the second embodiment. The radar device according to the second embodiment includes two transmitting array antennas 20Tx, four receiving array antennas 20Rx, a signal processing unit 51, a signal generating unit 52, a plurality of mixers 53, and a plurality of A / D converters 54. The signal processing unit 51, the signal generating unit 52, the plurality of mixers 53, and the plurality of A / D converters 54 are incorporated in a high-frequency circuit element 50 (Fig. 6).

[0047] Eight transmission / reception systems are defined by a combination of two transmitting array antennas 20Tx and four receiving array antennas 20Rx. The signal generating unit 52 modulates mutually orthogonal carrier waves based on the modulation signal received from the signal processing unit 51, and supplies the two modulated transmission signals to the two transmitting array antennas 20Tx, respectively.

[0048] A mixer 53 and an A / D converter 54 are provided for each of the eight transmission / reception systems. The mixer 53 mixes the transmission signal and the reception signal to generate an intermediate frequency signal. The A / D converter 54 A / D converts the intermediate frequency signal. The A / D converted intermediate frequency signal is input to the signal processing unit 51. The signal processing unit 51 performs signal processing on the multiple intermediate frequency signals to calculate the direction in which an object is located and the distance to the object.

[0049] Next, the advantageous effects of the second embodiment will be described. As in the first embodiment, in the second embodiment, the positional accuracy between the multiple radiating elements 12 (FIG. 5B) and the multiple protrusions 32 (FIG. 5A) can be easily improved, and the excellent effect of preventing the protrusions 32 from falling off due to vibration or impact can be obtained.

[0050] Furthermore, in the second embodiment, the plate-like portion 31 and the fixed portion 33 of the dielectric member 30 (FIGS. 5A and 6) function as a radome that protects the entire substrate 10 on which the radiating element 12 and the high-frequency circuit element 50 are mounted. Since the protruding portion 32 made of a dielectric material loaded on the radiating element 12 and the plate-like portion 31 and the fixed portion 33 that function as a radome are integrated, the number of parts can be reduced compared to a configuration in which the dielectric block loaded on the radiating element 12 and the radome are provided separately.

[0051] The above-mentioned embodiments are merely examples, and it goes without saying that partial replacement or combination of the configurations shown in different embodiments is possible. Similar effects due to similar configurations of multiple embodiments are not mentioned in each embodiment. Furthermore, the present invention is not limited to the above-mentioned embodiments. For example, it will be obvious to those skilled in the art that various modifications, improvements, combinations, etc. are possible. [Explanation of symbols]

[0052] 10 Substrate 11 Ground Plane 12 Radiating element 13 Power supply line 14 Backside ground plane 15 Via 17 Dielectric layer 20 Series-fed array antenna 20Rx Receiving array antenna 20Tx transmitting array antenna 30 Dielectric material 31 Plate-shaped part 32 Protrusion 33 Fixed part 40 Adhesive layer 41 Screw 50 High-frequency circuit elements 51 Signal processing section 52 Signal Generator 53 Mixer 54 A / D Converter 60 cases 61 Support surface 62 Bottom 63 Side wall

Claims

1. A substrate; a ground plane provided on the substrate; a plurality of radiating elements provided on the substrate, the radiating elements constituting a patch antenna together with the ground plane; a dielectric layer attached to the substrate so as to cover the plurality of radiating elements; a dielectric member disposed on the dielectric layer; Equipped with The dielectric member is a plate-like portion disposed at a distance from the dielectric layer; a plurality of protrusions protruding from the plate-like portion toward each of the plurality of radiating elements; a fixing portion that is disposed in an area that does not overlap with the plurality of radiating elements in a plan view and that protrudes from the plate-like portion toward the substrate; Including, An antenna device in which the relative positions of the multiple protrusions with respect to the multiple radiating elements are fixed via the fixing portion.

2. Let the wavelength corresponding to the center frequency of the operating frequency band of the patch antenna be λ ｄ be denoted, and when an arbitrary positive integer is denoted as n, the thickness of the plate-like portion is (n - 0.1) × (λ ｄ / 2) or more and (n + 0.3) × (λ ｄ / 2) or less. The antenna device according to claim 1, which is within the range of.

3. 3. The antenna device according to claim 1, wherein the height of each of the plurality of protrusions is equal to or greater than 0.4 times the wavelength corresponding to a center frequency of the operating frequency band of the patch antenna.

4. 3. The antenna device according to claim 1, wherein each of the plurality of protrusions is in contact with the dielectric layer, or the distance between each of the plurality of protrusions and the dielectric layer is 0.1 mm or less.

5. The antenna device according to claim 1 , wherein the plate-like portion, the plurality of protrusions, and the fixing portion are integrally formed.

6. moreover, a high-frequency circuit element mounted on the substrate; and a plurality of feeder lines connecting the high-frequency circuit element and each of the plurality of radiating elements; Equipped with The antenna device according to claim 1 , wherein the plate-like portion includes the high-frequency circuit element in a plan view.

7. the high-frequency circuit element is mounted on a surface of the substrate opposite to a surface on which the dielectric layer is disposed, a case that supports a peripheral portion of the substrate from the side on which the high-frequency circuit element is mounted and includes a support surface that extends outward from the edge of the substrate in a plan view, The antenna device according to claim 6 , wherein the dielectric member is fixed to the support surface of the case.

8. An antenna device according to claim 1 or 2; a signal generating unit for supplying a transmission signal to a part of the plurality of radiating elements for transmission; a signal processing unit that performs signal processing of the transmission signal and a reception signal received by the remaining reception radiating elements among the plurality of radiating elements; A radar device comprising:

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