Antenna equipment

Abstract

To provide an antenna device that can be manufactured with reduced weight and cost, having an excellent band property.SOLUTION: In an antenna device, an antenna device main body performing transmission and reception of electric waves includes a dielectric substrate D with a substantially flat plate shape, a first antenna element, and a second antenna element. Each of the first antenna element and the second antenna element includes power feeding element surface parts A11 and A21 and non-power feeding element surface parts A12 and A22. The power feeding element surface part A11 and the power feeding element surface part A21, and the non-power feeding element surface parts A12 and the non-power feeding element surface parts A22 are disposed facing each other with the dielectric substrate D held therebetween. The power feeding element surface parts A11 and A21 and the non-power feeding element surface parts A12 and A22 are disposed adjacent to each other with a predetermined gap therebetween by the provision of a gap part including a first slit region G11 therebetween.SELECTED DRAWING: Figure 10

Description

Technical Field

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

Background Art

[0002] An antenna is a device that transmits or receives electrical energy as radio waves into space, and its performance is characterized by various indicators such as antenna efficiency, gain, and directivity.

[0003] Based on the above-mentioned indicators and the like, there are various types of antennas. In particular, as an antenna most commonly used in EMC tests (electromagnetic compatibility tests), there is a dual-ridge horn antenna.

[0004] The dual-ridge horn antenna forms a linearly polarized wave and can obtain a very wideband operating frequency bandwidth under high load conditions.

[0005] As an invention related to this dual-ridge horn antenna, for example, Patent Document 1 describes an invention related to a horn antenna capable of expanding the effective operating frequency band compared to a conventional horn antenna.

[0006] This horn antenna is provided with an impedance matching circuit network for reducing the impedance mismatch between a transmission line that supplies power to the feeding area of the horn antenna and a pair of ridges. Thereby, it aims to reduce the impedance mismatch of the horn antenna and expand the operating frequency band.

Prior Art Documents

Patent Documents

[0007]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0008] Incidentally, in a dual-ridge horn antenna as described above, the shape of each ridge greatly affects its performance, such as its bandwidth characteristics, and each ridge is usually manufactured by machining aluminum. Therefore, if distortion of the shape of each ridge or surface damage occurs during the manufacturing process, the desired performance may not be achieved.

[0009] Given the above circumstances, dual-ridge horn antennas have high manufacturing costs. In addition, the finished product had a certain weight, making it difficult to transport and thus not very versatile.

[0010] This invention has been made in view of the above-mentioned circumstances, and aims to provide an antenna device that is lightweight, inexpensive to manufacture, and has good bandwidth characteristics. [Means for solving the problem]

[0011] To solve the above problems, the present invention comprises an antenna device body that transmits and receives radio waves, The antenna device body comprises a substantially flat dielectric substrate, a substantially flat first antenna element laminated on one surface of the dielectric substrate, and a substantially flat second antenna element laminated on the other surface of the dielectric substrate. The first antenna element and the second antenna element each include a feeding element surface portion that constitutes a feeding element and a non-feeding element surface portion that constitutes a non-feeding element, The feeding element surface of the first antenna element and the unfeeded element surface of the second antenna element, and the unfeeded element surface of the first antenna element and the feeding element surface of the second antenna element are each arranged to face each other with the dielectric substrate in between. In each of the aforementioned antenna elements, the feeding element surface and the non-feeding element surface are arranged adjacent to each other at a predetermined distance apart, with a gap provided between them. The gap portion is formed with a substantially elongated slit region and a stepped region connected to one end of the slit region, which increases the distance between the power supply element surface and the non-power supply element surface in a stepped manner as it moves away from one end of the slit region. Each of the aforementioned power supply element surfaces and each of the opposing non-power supply element surfaces are electrically connected by vias drilled along their respective outer circumferences. The vias are drilled in accordance with each step in the staircase area.

[0012] According to the present invention, a so-called dipole antenna can be constructed as a substantially flat body using a dielectric substrate and each antenna element. Therefore, the antenna device itself can be manufactured lightly and inexpensively while obtaining good bandwidth characteristics as an antenna. More specifically, according to the present invention, a heavy and expensive coaxial waveguide converter is not required, and since the device can be manufactured primarily from a dielectric substrate, the antenna device can be mass-produced with a manufacturing precision of μm (micrometer).

[0013] In a preferred embodiment of the present invention, the slit region is formed with a first slit region connected to the step region and separating the power supply element surface and the non-power supply element surface along the left-right direction, and a second slit region separating the power supply element surface and the non-power supply element surface along the up-down direction. The first slit region is configured to extend in a substantially straight line, The second slit region has a tapered region that extends in a substantially straight line such that the angle it makes with the direction in which the first slit region extends is acute.

[0014] This configuration stabilizes the impedance of the antenna device itself, allowing for an upward-biased radiation pattern for radio waves while achieving good bandwidth characteristics.

[0015] In a preferred embodiment of the present invention, on the power supply element surface portion of the first antenna element, the side end surface forming the first slit region and the side end surface forming the first slit region on the power supply element surface portion of the second antenna element are arranged on substantially the same plane.

[0016] By adopting such a configuration, better band characteristics can be obtained.

[0017] In a preferred embodiment of the present invention, a release window formed by punching out the dielectric substrate is provided in the stepped region, and the release window is formed in a tapered shape as it approaches the slit region.

[0018] By adopting such a configuration, radio waves between the power supply element surface portion and the non-power supply element surface portion are radiated to the outside through the release window, so that dielectric loss can be suppressed and better gain can be obtained.

[0019] In a preferred embodiment of the present invention, the number of vias drilled corresponding to each step portion of the stepped region is three or more.

[0020] By adopting such a configuration, the Q value increases and stabilizes, and better band characteristics can be obtained more deeply.

[0021] In a preferred embodiment of the present invention, the antenna device main body is provided with a mounting portion for mounting an attachment for supporting the antenna device main body.

[0022] By adopting such a configuration, the convenience of this antenna device is improved.

Advantages of the Invention

[0023] According to the present invention, it is possible to provide an antenna device that can be manufactured at a low cost and has good band characteristics.

Brief Description of the Drawings

[0024] [Figure 1] This is a perspective view of the antenna device body as seen from the surface of an embodiment of the present invention. [Figure 2] This is a perspective view of the antenna device body as seen from the surface of an embodiment of the present invention. [Figure 3] This is a front view of the antenna device body according to an embodiment of the present invention. [Figure 4] This figure shows each antenna element of an antenna device body according to an embodiment of the present invention, (a) a front view and (b) a rear view. [Figure 5] This is an enlarged cross-sectional view of the antenna device body according to an embodiment of the present invention, along the PP' line. [Figure 6] This is a perspective view showing the antenna device body according to an embodiment of the present invention with the first attachment attached. [Figure 7] This is a front view of the antenna device body according to an embodiment of the present invention with the first attachment attached. [Figure 8] This is a perspective view showing the antenna device body according to an embodiment of the present invention with the second attachment attached. [Figure 9] This is a front view of the antenna device body according to an embodiment of the present invention with the second attachment attached. [Figure 10] This figure shows a modified example of the antenna device body according to an embodiment of the present invention. [Modes for carrying out the invention]

[0025] <Structure> The antenna device according to an embodiment of the present invention will be described below with reference to Figures 1 to 9. In these figures, the symbol X indicates the antenna device according to this embodiment.

[0026] Furthermore, for the sake of clarity in the following explanation, the x-axis direction shown in Figure 1, etc., will be referred to as the left-right direction, and the y-axis direction as the up-down direction. Furthermore, except for Figure 5, the multiple through-hole vias (hereinafter simply referred to as via v) described later are shown as small white circles, while the first through-hole m1 and the second through-hole m2 described later are shown as larger white circles. Furthermore, the embodiments described below are merely examples of the present invention, and the present invention is not limited to these embodiments.

[0027] <<Antenna device main unit 1>> As shown in Figures 1 to 5, the antenna device X includes an antenna device body 1 that transmits and receives radio waves.

[0028] <<<Divide substrate D, and antenna elements A1, A2>>> The antenna device body 1 includes a substantially flat dielectric substrate D, a substantially flat first antenna element A1 laminated on one surface of the dielectric substrate D, and a substantially flat second antenna element A2 laminated on the other surface (back surface) of the dielectric substrate D.

[0029] The antenna device body 1 has a coating on its surface to prevent the substrate patterns of each antenna element A1 and A2 from being visible, with the edges and other parts of the surface partially exposed. However, as shown in Figure 4, the coating does not necessarily have to be applied. Furthermore, Figure 4 omits the via v and mounting section m, which will be discussed later.

[0030] The derivative substrate D has capacitive properties for accumulating charge and comprises a first component D1 and a second component D2 connected in the vertical direction. Furthermore, the dielectric substrate D has a shape that is approximately symmetrical overall. The derivative substrate D is formed from, for example, a glass epoxy material also known as FR4, but it may also be formed from other derivatives such as ceramic, glass composite (Sem3), paper phenol, paper epoxy, or halogen-free materials.

[0031] The first component D1 is configured such that its width increases in the left-right direction as it extends upwards, while the second component D2 is configured in a roughly rectangular shape. Furthermore, by giving the first component D1 the shape described above, the directivity of the radio waves can be directed upwards.

[0032] The first antenna element A1 and the second antenna element A2 each include, in particular as shown in Figure 4, feed element surfaces A11 and A21 that constitute a feed element and non-feed element surfaces A12 and A22 that constitute a non-feed element. Furthermore, the first antenna element A1 and the second antenna element A2 are laminated so as to cover the entire surface of each side of the dielectric substrate D, except for the gap G which will be described later. The first antenna element A1 and the second antenna element A2 are constructed, for example, as copper plates, but they may also be made of other conductive metals such as gold, nickel, or silver.

[0033] The power supply element surface A11 and the power supply element surface A21 are arranged to face each other with the dielectric substrate D in between. Both the passive element surface A12 and the passive element surface A22 are similarly positioned to face each other with the dielectric substrate D in between.

[0034] Furthermore, the power supply element surface A11 and the non-power supply element surface A22, or the non-power supply element surface A12 and the power supply element surface A21, are arranged on the dielectric substrate D such that, with the exception of the coplanar structure p described later, there are no overlapping portions when viewed from the front (in the stacking direction).

[0035] <<<Gap section G>>> The power supply element surface A11 and the non-power supply element surface A12, or the power supply element surface A12 and the non-power supply element surface A22, are arranged adjacent to each other on the dielectric substrate D with a gap G between them, so as not to come into contact at a predetermined distance.

[0036] Here, the gap G is shown in particular in Figure 4. Furthermore, in the overall view of Figure 4, each region included in the gap G is shown as a white area excluding the open window R, which will be described later, or as a very thick line.

[0037] The gap G has a roughly elongated slit region G1 and a stepped region G2 that is connected to one upper end of the slit region G1 and increases the distance between the power supply element surfaces A11 and A21 and the non-power supply element surfaces A12 and A22 in a stepped manner as it moves away from one end of the slit region G1 (as it moves upward).

[0038] The slit region G1 is connected to the stair region G2 and has a first slit region G11 that separates the power supply element surfaces A11 and A21 from the non-power supply element surfaces A12 and A22 along the left-right direction, and a second slit region G12 that separates the power supply element surfaces A11 and A21 from the non-power supply element surfaces A12 and A22 along the up-down direction.

[0039] The first slit region G11 is a substantially linear region that extends along the center line C that bisects the derivative substrate D. Furthermore, the width of the first slit region G11 in the left-right direction is preferably formed to be in the range of 0.25 to 1.25 mm in order to obtain an effective VSWR value, and more preferably to be formed to be about 0.5 mm.

[0040] In the second slit region G12, a tapered region t is formed that extends in a substantially straight line such that the angle θ it makes with the direction d1 in which the first slit region G11 extends is acute. Furthermore, it is preferable that the angle θ between the direction d1 (direction of the center line C) in which the first slit region G11 extends and the direction d2 in which the tapered region t extends be in the range of 46 to 80 degrees.

[0041] Furthermore, a coplanar structure forming region k is formed in the second slit region G12 on the surface, extending in the left-right direction and connecting with the first slit region G11 and the tapered region t, respectively, thereby constituting the coplanar structure p. This contributes to stabilizing the impedance (50Ω) of the antenna device body 1. In Figure 4(a), the coplanar structure p is indicated by a dashed-dotted rectangle as the region containing it.

[0042] Furthermore, in each surface, an auxiliary region n is formed in the second slit region G12 that is connected to the tapered region t and extends along the left-right direction to the outer edge of the derivative substrate D.

[0043] The staircase region G2 is a region that exhibits a roughly symmetrical shape with respect to the center line C as the axis, and is constructed so as to draw a quadratic function curve by connecting the tips of the convex parts of each step on both the left and right sides. Furthermore, the height of each step in the staircase region G2 is preferably spaced at intervals of 1 to 10 mm, more preferably at about 2 to 7 mm, and most preferably at about 2.5 to 5 mm, in order to obtain effective bandwidth characteristics.

[0044] Furthermore, the stepped region G2 is provided with an open window R formed by cutting out the dielectric substrate D. The opening window R is formed to taper as it approaches the first slit region G11, and its left and right sides have a shape that follows the quadratic function curve formed by the endpoints of each step.

[0045] Furthermore, by positioning the tapered end (lower end) of the open window R between the second or first step from the bottom of the stepped region G2, as shown in Figure 3, a deeper and better bandwidth characteristic can be obtained. Furthermore, it is preferable that the upper edge (the side extending in the left-right direction) of the open window R be formed to be located between the 1st and 10th steps from the top of the staircase area G2.

[0046] <<<Beer v>>> Each power supply element surface A11, A21 and the opposing non-power supply element surface A12, A22 are electrically connected by vias v drilled along their respective outer circumferences.

[0047] More specifically, multiple vias v are drilled, corresponding to each step in the staircase area G2. Furthermore, multiple vias v are drilled along the slit region G1 on the surface. Furthermore, multiple vias v are drilled along the outer edges of the first component D1 and the second component D2, respectively.

[0048] In this embodiment, the number of vias v drilled in each step of the staircase region G2 is three per step. Note that the number of vias v is not limited to those mentioned above; there may be four or more, and although the bandwidth characteristics will be slightly reduced, there may also be one or two vias. Furthermore, if the number of vias v is four or more and they are drilled in an aligned vertical arrangement, they will not fit in a single layer in this embodiment. In this case, the vias v should be drilled in a staggered pattern.

[0049] <<<Other Structures>>> As shown in Figure 5, the side end face f1 that forms the first slit region G11 on the power supply element surface A11 and the side end face f2 that forms the first slit region G11 on the power supply element surface A21 are arranged on substantially the same plane. More specifically, in this embodiment, side end faces f1 and f2 are arranged on a plane that passes through the center line C and is perpendicular to the plane direction of the dielectric substrate D. The above plane is shown by a dashed line in Figure 5.

[0050] The antenna device body 1 is provided with a mounting portion m for attaching an attachment 2 that supports the antenna device body 1. More specifically, the mounting portion m is composed of a first through-hole m1 provided at predetermined intervals along the left and right outer edges of the first component D1, and a second through-hole m2 provided in the second component D2.

[0051] The antenna device body 1 is provided with a power supply unit w that is electrically connected to the coplanar structure unit p. The power supply unit w is connected to a coaxial cable (not shown) and is used to supply power to the power supply element surface A11 and to output the received signal to the outside.

[0052] <<Attachment 2>> As shown in Figures 6 to 9, the antenna device X is equipped with an attachment 2 that transmits and receives radio waves.

[0053] <<<First Attachment 21>>> As shown in Figure 6, attachment 2 has a first attachment 21.

[0054] In both the example shown in Figure 6(a) and Figure 6(b), the first attachment 21 includes a pair of electrode plates 21a, a detachable part 21b, a support base 21c, and a mounting base 21d.

[0055] Figure 6(a) shows an example in which a pair of electrode plates 21a are arranged in the left-right direction of the antenna device body 1. Figure 7 is a front view of the example shown in Figure 6(a).

[0056] More specifically, in this example, each electrode plate 21a is bent to conform to the shape of the left and right end faces of the dielectric substrate D (and each antenna element A1, A2), and its lower part is bent into a roughly L-shape for connection with the support base 21c. Furthermore, the left electrode plate 21a is provided with a through hole (not shown) so that the end of the power supply section w can be exposed.

[0057] In this example, the detachable portion 21b is a slender member that protrudes from the inner circumferential surface of each electrode plate 21a and extends along the outer circumferential edge (exposed portion) of each antenna element A1, A2, and is provided with communication holes (not shown) at approximately the same interval as the first through hole m1. As a result, by bringing the end face of the dielectric substrate D into contact with the inner circumferential surface of each electrode plate 21a, each first through hole m1 and each communication hole are connected, and fastening members s (bolts and nuts) are inserted and fastened through these holes, thereby attaching each electrode plate 21a to the antenna device body 1.

[0058] The support base 21c is a pair of rectangular tubular bodies and is attached in such a manner that it sandwiches the second component D2 (and each antenna element A1, A2) of the dielectric substrate D from the front and rear directions. Furthermore, the upper surface of each support base 21c and the lower surface of each electrode plate 21a are provided with communication holes (not shown) for fastening that communicate with each other. This brings the lower surface of each electrode plate 21a into contact with the upper surface of each support base 21c, thereby connecting the communication holes. Fastening members s (bolts and nuts) are then inserted and fastened through these holes, connecting each electrode plate 21a to each support base 21c.

[0059] The mounting base 21d, as shown in particular in Figure 7, is composed of a roughly disc-shaped main body portion h1, a male screw portion h2 extending downward from approximately the center of the main body portion h1, and a nut portion h3.

[0060] The main body h1 is connected to the lower surface of each support base 21c by various fastening members such as bolts and nuts. Furthermore, the user can fix the antenna device body 1 to the mounting base (not shown) provided at the base station or the like by inserting the male screw portion h2 into the hole of the mounting base and fastening it with the nut portion h3.

[0061] Figure 6(b) shows an example in which a pair of electrode plates 21a are arranged in a direction (front-to-back direction) that sandwiches the antenna device body 1.

[0062] More specifically, in this example, each electrode plate 21a is configured to have substantially the same shape as the dielectric substrate D when viewed from the front, and its lower part is bent into a substantially L-shape for connection with the support base 21c.

[0063] In this example, the detachable part 21b is composed of a pair of roughly rectangular plate-shaped suspension parts r1 extending in the front-rear direction, and a plurality of roughly L-shaped brackets r2 fastened and fixed at predetermined intervals between each suspension part r1. Furthermore, the detachable portion 21b is connected to each electrode plate 21a via the front and rear brackets r2 in each suspension portion r1. Furthermore, the central bracket r2 in each suspension section r1 is provided with a communication hole (not shown) that communicates with the uppermost first through hole m1.

[0064] As a result, each electrode plate 21a is positioned at the front and rear of the antenna device body 1, and each suspension portion n1 is brought into contact with the left and right end faces of the antenna device body 1, thereby connecting each first through hole m1 with each communication hole. Fastening members s (bolts and nuts) are then inserted and fastened through these holes, thereby attaching each electrode plate 21a to the antenna device body 1.

[0065] The configuration of the support base 21c and the mounting base 21d is the same as described using Figure 6(a), so that explanation will be omitted.

[0066] By using the first attachment 21, which is positioned to sandwich the antenna device body 1 from the left and right or front and back directions, the radiation width of the radio waves is narrowed, and the radiation gain is increased and improved by the relationship between the electric and magnetic fields, making it easier to install at a base station. This allows the antenna device body 1 to be suitably used as an antenna for inspection.

[0067] <<<Second Attachment 22>>> As shown in Figure 8, attachment 2 has a second attachment 22.

[0068] The second attachment 22 includes a grip portion 22a, a bracket 22b, and an angle adjustment portion 22c.

[0069] The grip portion 22a has a predetermined uneven shape on the side facing the antenna device body 1 so that it fits comfortably in the user's hand.

[0070] The bracket 22b is a substantially plate-shaped member and is provided with a communication hole (not shown) that can communicate with each second through hole m2. As a result, each first through-hole m2 and each communication hole are connected, and fastening members s (bolts and nuts) are inserted and fastened through these holes, thereby attaching the second attachment 22 to the antenna device body 1.

[0071] The angle adjustment section 22c is interposed between the grip section 22a and the bracket 22b. Furthermore, the angle adjustment unit 22c is configured to allow independent control of the rotational movement of the antenna device body 1 within its plane and the rotational movement perpendicular to this plane. This allows the user to easily adjust the angle and position the antenna device body 1 so that it extends in a desired direction relative to the grip portion 22a.

[0072] By using the second attachment 22, which includes the grip portion 22a described above, the user can grasp the grip portion 22a and transport the antenna device body 1 without narrowing the radio wave radiation width. This makes it easier for the user to find the area where the antenna device 1 should be installed.

[0073] <Effects> According to the above embodiment, a so-called dipole antenna can be constructed as a substantially flat body using the dielectric substrate D and each antenna element A1, A2. Therefore, the antenna device body 1 can be manufactured lightly and inexpensively while obtaining good bandwidth characteristics as an antenna.

[0074] Furthermore, the tapered region t in the gap G stabilizes the impedance of the antenna device body 1, allowing for an upward-biased radiation pattern for radio waves while achieving good bandwidth characteristics.

[0075] Furthermore, since side end faces f1 and f2 are arranged on approximately the same plane, a deeper and better bandwidth characteristic can be obtained.

[0076] Furthermore, the open window R suppresses dielectric losses, allowing for better gain.

[0077] Furthermore, by setting the number of vias v drilled in each step of the staircase region G2 to three, the Q value is increased and stabilized, resulting in a deeper and better bandwidth characteristic.

[0078] Furthermore, the mounting section m allows each attachment 21 and 22 to be attached to the antenna device body 1, improving the convenience of the antenna device body 1 depending on the situation, such as installation at a base station or searching for an installation location.

[0079] <Example of changes> Furthermore, the term "abbreviated" in the application documents refers to a concept that includes shapes that have been chamfered or rounded, as well as shapes whose constituent elements have been modified or altered in length to the extent that it does not impede the purpose of the shape. Furthermore, the shapes and dimensions of each component shown in the above embodiment are merely examples and can be modified in various ways based on design requirements, etc.

[0080] For example, in the above example, Figure 5 shows an example in which side end faces f1 and f2 are arranged on substantially the same plane, but the arrangement is not limited to this, and the thickness of the dielectric substrate may slightly overlap in the slit region G1 when viewed from the front, between the power supply element surface A11 and the power supply element surface A12.

[0081] This example of a change will be explained in detail using Figure 10. In Figure 10, (a) is a front view relating to the above modification example, (b) is an enlarged view of the dotted rectangle frame in (a), and (c) is an enlarged cross-sectional view along the QQ' line. Figure 10(b) is an enlarged view centered on the first slit region G11, with the outer shape of the power supply element surface A11 on the front surface shown by a solid line, and the outer shape of the power supply element surface A12 on the back surface shown by a dashed line.

[0082] As shown in Figure 10(b), the power supply element surface A11 and the power supply element surface A12 overlap in the slit region G1 by a length L1 in the vertical direction. Furthermore, as shown in Figure 10(c), the power supply element surface A11 and the power supply element surface A12 overlap in the slit region G1 by a length L2 in the left-right direction. Length L1 is preferably λ / 9, and length L2 is preferably λ / 1500. [Explanation of Symbols]

[0083] X Antenna Device 1. Antenna device main unit D derivative substrate A1 First antenna element A11 Power supply element surface A12 Parasitic element surface A2 Second antenna element A21 Power supply element surface A22 Parasitic element surface section G Gap Section G1 Stairs area G2 Slit Region v bia 2 Attachments 21 First Attachment 22 Second Attachment

Claims

1. It includes an antenna device that transmits and receives radio waves, The antenna device body comprises a substantially flat dielectric substrate, a substantially flat first antenna element laminated on one surface of the dielectric substrate, and a substantially flat second antenna element laminated on the other surface of the dielectric substrate. The first antenna element and the second antenna element each include a feeding element surface portion that constitutes a feeding element and a non-feeding element surface portion that constitutes a non-feeding element, The feeding element surface of the first antenna element and the feeding element surface of the second antenna element, and the unpowered element surface of the first antenna element and the unpowered element surface of the second antenna element are each arranged to face each other with the dielectric substrate in between. In each of the aforementioned antenna elements, the feeding element surface and the non-feeding element surface are arranged adjacent to each other at a predetermined distance apart, with a gap provided between them. The gap portion is formed with a substantially elongated slit region and a stepped region connected to one end of the slit region, which increases the distance between the power supply element surface and the non-power supply element surface in a stepped manner as it moves away from one end of the slit region. Each of the aforementioned power supply element surfaces and each of the opposing non-power supply element surfaces are electrically connected by vias drilled along their respective outer circumferences. The vias are antenna devices drilled in the staircase area, corresponding to each step.

2. The slit region includes a first slit region connected to the step region that separates the power supply element surface and the non-power supply element surface along the left-right direction, and a second slit region that separates the power supply element surface and the non-power supply element surface along the up-down direction. The first slit region is configured to extend in a substantially straight line, The antenna device according to claim 1, wherein a tapered region is formed in the second slit region, extending substantially in a straight line such that the angle it makes with the direction in which the first slit region extends is acute.

3. The antenna device according to claim 2, wherein the side end surface forming the first slit region on the feeding element surface of the first antenna element and the side end surface forming the first slit region on the feeding element surface of the second antenna element are arranged substantially on the same plane.

4. The aforementioned staircase region is provided with an open window formed by hollowing out the dielectric substrate. The antenna device according to claim 1, wherein the opening window is formed to taper as it approaches the slit region.

5. The antenna device according to claim 1, wherein the number of vias drilled corresponding to each step of the aforementioned staircase area is three or more.

6. The antenna device according to claim 1, wherein the antenna device body is provided with a mounting portion for attaching an attachment that supports the antenna device body.

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