Antenna device

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 technology]

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

[0003] Furthermore, there are various types of antennas based on the above-mentioned indicators, but the dual-ridged horn antenna is the antenna most commonly used for EMC testing (electromagnetic compatibility testing).

[0004] The dual-ridged horn antenna produces linearly polarized waves and can achieve a very wide operating frequency bandwidth under heavy loads.

[0005] Furthermore, as an invention relating to this dual-ridged horn antenna, for example, Patent Document 1 describes an invention relating to a horn antenna that can widen the effective operating frequency band compared to conventional horn antennas.

[0006] The horn antenna is provided with an impedance matching network for reducing the impedance mismatch between the pair of ridges and a transmission line that supplies power to the feed region of the horn antenna. This aims to reduce impedance mismatch of the horn antenna and to widen the operating frequency band. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Patent No. 5036772 Summary of the Invention [Problem to be solved by the invention]

[0008] In the dual-ridged horn antenna described above, the shape of each ridge has a significant effect on its performance, such as its band characteristics, and each ridge is usually manufactured by cutting out aluminum. Therefore, if the shape of each ridge is distorted or the surface is damaged during the manufacturing process, the desired performance may not be achieved.

[0009] Due to the above circumstances, the manufacturing cost of the dual-ridged horn antenna is high. In addition to this, the finished product has a certain weight, which makes it difficult to transport and is not versatile.

[0010] The present invention has been made in view of the above-described circumstances, and an object of the present invention is to provide an antenna device that is lightweight, can be manufactured at low cost, and has good band characteristics. [Means for solving the problem]

[0011] In order to solve the above problems, the present invention provides an antenna device comprising: an antenna device main body for transmitting and receiving radio waves; the antenna device main body includes a substantially flat-plate-shaped dielectric substrate, a substantially flat-plate-shaped first antenna element laminated on one surface of the dielectric substrate, and a substantially flat-plate-shaped second antenna element laminated on the other surface of the dielectric substrate; the first antenna element and the second antenna element each include a feed element surface portion constituting a feed element and a parasitic element surface portion constituting a parasitic element, the feed element surface portion of the first antenna element and the parasitic element surface portion of the second antenna element, and the parasitic element surface portion of the first antenna element and the feed element surface portion of the second antenna element are arranged to face each other with the dielectric substrate interposed therebetween, the feed element surface portion and the parasitic element surface portion of each of the antenna elements are disposed adjacent to each other at a predetermined interval by providing a gap portion therebetween; the gap portion is formed with a substantially elongated slit region and a step region that is connected to one end of the slit region and increases the distance between the feed element surface portion and the parasitic element surface portion in a step-like manner as the gap portion moves away from the one end of the slit region, the feed element surface portions and the opposing parasitic element surface portions are electrically connected to each other by vias drilled along the outer periphery of each of the feed element surface portions, The vias are drilled corresponding to the steps in the staircase region.

[0012] According to the present invention, a so-called dipole antenna can be constructed as an approximately flat plate-shaped body using a dielectric substrate and each antenna element, making it possible to manufacture the antenna device body lightweight and inexpensively while still achieving good band characteristics as an antenna. More specifically, according to the present invention, since a heavy and expensive coaxial-waveguide converter is not required and the antenna device can be manufactured using a dielectric substrate as the main component, the antenna device can be mass-produced with manufacturing precision of μm (micrometers).

[0013] In a preferred embodiment of the present invention, the slit region is formed with a first slit region that is connected to the staircase region and separates the feed element surface portion and the parasitic element surface portion along the left-right direction, and a second slit region that separates the feed element surface portion and the parasitic element surface portion along the up-down direction, The first slit region is configured to extend substantially linearly, The second slit region has a tapered region extending substantially linearly so as to form an acute angle with the direction in which the first slit region extends.

[0014] With this configuration, the impedance of the antenna device body can be stabilized, and good band characteristics can be obtained while obtaining an upward radiation pattern for radio waves.

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

[0016] With this configuration, better band characteristics can be obtained.

[0017] In a preferred embodiment of the present invention, the staircase region is provided with an opening formed by hollowing out the dielectric substrate, and the opening is formed so as to have a tapered shape as it approaches the slit region.

[0018] With this configuration, radio waves between the feed element surface and the parasitic element surface are emitted to the outside through the open window, which reduces dielectric loss and provides better gain.

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

[0020] By using such a configuration, the Q value is increased and stabilized, and deeper and better band characteristics can be obtained.

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

[0022] With this configuration, the convenience of the present antenna device is improved. [Effects of the Invention]

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

[0024] [Figure 1] 1 is a perspective view of an antenna device main body according to an embodiment of the present invention as viewed from the front side. [Figure 2] 1 is a perspective view of an antenna device main body according to an embodiment of the present invention as viewed from the front side. [Figure 3] FIG. 2 is a front view of the antenna device main body according to the embodiment of the present invention. [Figure 4] 2A and 2B are diagrams showing antenna elements of an antenna device main body according to an embodiment of the present invention, where (a) is a front view and (b) is a back view. [Figure 5] 2 is an enlarged cross-sectional view of the antenna device main body according to the embodiment of the present invention taken along line PP'. FIG. [Figure 6] 1 is a perspective view of an antenna device main body according to an embodiment of the present invention with a first attachment attached thereto. FIG. [Figure 7] 1 is a front view of an antenna device main body according to an embodiment of the present invention with a first attachment attached thereto. FIG. [Figure 8] FIG. 2 is a perspective view of the antenna device main body according to the embodiment of the present invention with a second attachment attached thereto. [Figure 9] FIG. 2 is a front view of the antenna device main body according to the embodiment of the present invention with a second attachment attached thereto. [Figure 10] 10A and 10B are diagrams illustrating a modified example of the antenna device main body according to the embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0025] <Configuration> Antenna devices according to embodiments of the present invention will be described below with reference to FIGS. In these figures, the symbol X indicates the antenna device according to this embodiment.

[0026] For convenience of explanation, the x-axis direction shown in FIG. 1 etc. will be referred to as the left-right direction, and the y-axis direction as the up-down direction. Also, except for Figure 5, the multiple penetrating conductive through holes Via (hereinafter simply referred to as vias v) described later are shown as small white circles, and the first through hole m1 and second through hole m2 described later are shown as larger white circles. Furthermore, the embodiment described below is an example of the present invention, and the present invention is not limited to the embodiment described below.

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

[0028] <<<Dielectric substrate D and antenna elements A1 and A2>>> The antenna device main body 1 has a substantially flat dielectric substrate D, a substantially flat first antenna element A1 stacked on one surface of the dielectric substrate D, and a substantially flat second antenna element A2 stacked on the other surface (rear surface) of the dielectric substrate D.

[0029] The surface of the antenna device main body 1 is coated to prevent the substrate pattern of each antenna element A1, A2 from being visible, and the surface is partially exposed, such as at the periphery, but as shown in Figure 4, it does not have to be coated. Also, in FIG. 4, vias v and attachment portions m, which will be described later, are omitted.

[0030] The dielectric substrate D has a capacitance for storing electric charges, and includes a first component D1 and a second component D2 connected in the vertical direction. Moreover, the dielectric substrate D has a generally symmetrical shape overall. The dielectric substrate D is formed, for example, from a glass epoxy material also known as FR4, but it may also be formed from other derivatives such as ceramic, glass composite (ceramic), paper phenol, paper epoxy, and halogen-free.

[0031] The first component D1 is configured so that its width in the left-right direction increases as it goes upward, and the second component D2 is configured in a substantially rectangular shape. By forming the first component D1 in the above-described shape, the directivity of the radio waves can be shifted upward.

[0032] As shown particularly in FIG. 4, the first antenna element A1 and the second antenna element A2 each include a feed element surface portion A11, A21 constituting a feed element, and a parasitic element surface portion A12, A22 constituting a parasitic element. The first antenna element A1 and the second antenna element A2 are laminated so as to cover the entire surfaces of the dielectric substrate D except for a gap portion G, which will be described later. The first antenna element A1 and the second antenna element A2 are configured as, for example, copper plates, but may be formed from 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 interposed therebetween. Similarly, the parasitic element surface A12 and the parasitic element surface A22 are arranged to face each other with the dielectric substrate D interposed therebetween.

[0034] Furthermore, the feed element surface portion A11 and the parasitic element surface portion A22, or the parasitic element surface portion A12 and the feed element surface portion A21, are arranged on the dielectric substrate D so that there are no overlapping portions when viewed from the front (stacking direction), except for the coplanar structure portion p described below.

[0035] <<<Gap G>>> The powered element surface portion A11 and the parasitic element surface portion A12, or the powered element surface portion A12 and the parasitic element surface portion A22, are arranged adjacent to each other at a predetermined distance and without contact on the dielectric substrate D, by providing a gap portion G between them.

[0036] Here, the gap portion G is particularly shown in FIG. In the overall view of FIG. 4, the regions included in the gap G are indicated by white regions or thick lines excluding open windows R, which will be described later.

[0037] The gap portion G is formed with a substantially elongated slit region G1 and a staircase region G2 that is connected to one upper end of the slit region G1 and increases the distance between the power-supply element surface portions A11, A21 and the parasitic element surface portions A12, A22 in a staircase manner as it moves away from one end of the slit region G1 (as it moves upward).

[0038] The slit region G1 is formed with a first slit region G11 that is connected to the staircase region G2 and separates the power-fed element surface portions A11, A21 from the parasitic element surface portions A12, A22 in the left-right direction, and a second slit region G12 that separates the power-fed element surface portions A11, A21 from the parasitic element surface portions A12, A22 in the up-down direction.

[0039] The first slit region G11 is a substantially linear region extending along the center line C that divides the dielectric substrate D into two equal parts. 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 about 0.5 mm.

[0040] The second slit region G12 is formed with a tapered region t extending substantially linearly so that the angle θ formed with respect to the direction d1 in which the first slit region G11 extends is an acute angle. The angle θ formed by the direction d1 in which the first slit region G11 extends (the direction of the center line C) and the direction d2 in which the tapered region t extends is preferably in the range of 46 degrees to 80 degrees.

[0041] In addition, in the second slit region G12 on the surface, a coplanar structure forming region k is formed, which extends in the left-right direction and connects to the first slit region G11 and the tapered region t to form the coplanar structure portion p. This contributes to stabilizing the impedance (50Ω) of the antenna device main body 1. In FIG. 4(a), the coplanar structure portion p is shown as a region including the coplanar structure portion p, enclosed by a dashed-dotted rectangular frame.

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

[0043] The staircase region G2 is a region that has a shape that is approximately symmetrical about the center line C, and is configured so that a quadratic function curve is drawn by connecting the tips of the convex portions of each step on both the left and right sides. The height of each step in the staircase region G2 is preferably 1 to 10 mm, more preferably about 2 to 7 mm, and most preferably about 2.5 to 5 mm, in order to obtain effective band characteristics.

[0044] In addition, an open window R formed by hollowing out the dielectric substrate D is provided in the staircase region G2. The open window R is formed to have a tapered shape as it approaches the first slit region G11, and its left and right sides have a shape that follows a quadratic function curve formed by the endpoints of each step.

[0045] Furthermore, by forming the position of the tapered end (lower end) of the open window R to be located between the second step from the bottom or the first step of the staircase region G2 as shown in Figure 3, etc., deeper and better band characteristics can be obtained. In addition, it is preferable that the upper edge (the side extending in the left-right direction) of the open window R is formed so as to be positioned between the first and tenth steps from the top of the staircase region G2.

[0046] <<<Via v>>> The feed element surfaces A11 and A21 and the opposing parasitic element surfaces A12 and A22 are electrically connected to each other by vias v drilled along the outer periphery of each.

[0047] More specifically, a plurality of vias v are drilled corresponding to the respective steps of the staircase region G2. A plurality of vias v are drilled along the slit region G1 on the surface. Furthermore, a plurality of vias v are drilled along the outer edges of the first component D1 and the second component D2.

[0048] In particular, the number of vias v drilled corresponding to each step in the staircase region G2 is three for each step in this embodiment. The number of vias v is not limited to this, and may be four or more, or may be one or two, although this will slightly reduce the bandwidth characteristics. Furthermore, if the number of vias v is four or more and they are drilled in a vertically aligned manner, they will not fit in one row in this embodiment, so in this case the vias v may be drilled in a staggered pattern.

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

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

[0051] The antenna device main body 1 is provided with a feeding portion w that is electrically connected to the coplanar structure portion 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 a received signal to the outside.

[0052] <<Attachment 2>> As shown in FIGS. 6 to 9, the antenna device X includes an attachment 2 for transmitting and receiving radio waves.

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

[0054] In both the examples of FIG. 6(a) and FIG. 6(b), the first attachment 21 includes a pair of electrode plates 21a, a detachable portion 21b, a support base 21c, and a mounting base 21d.

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

[0056] In more detail, in this example, each electrode plate 21a is bent to have a shape that conforms to the left and right end faces of the dielectric substrate D (and each antenna element A1, A2), and its lower portion is bent into an approximately L-shape for connection to the support base 21c. The left electrode plate 21a is provided with a through hole (not shown) so that the end of the power supply part w can be exposed.

[0057] In this example, the detachable portion 21b is an elongated member that protrudes from the inner surface of each electrode plate 21a and extends along the outer peripheral edge (exposed portion) of each antenna element A1, A2, and has communicating holes (not shown) at approximately the same intervals as the first through holes m1. As a result, by abutting the end face of the dielectric substrate D against the inner surface of each electrode plate 21a, each first through hole m1 and each communicating hole are connected, and by inserting and fastening a fastening member s (bolt or nut) here, each electrode plate 21a is attached to the antenna device main body 1.

[0058] The support bases 21c are a pair of rectangular cylindrical bodies, and are attached in such a manner that they sandwich the second component D2 (and the antenna elements A1, A2) of the dielectric substrate D from the front and rear directions. 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, which communicate with each other. As a result, the lower surface of each electrode plate 21a is brought into contact with the upper surface of each support base 21c, thereby connecting each communication hole, and fastening members s (bolts and nuts) are inserted and fastened here, thereby connecting each electrode plate 21a to each support base 21c.

[0059] As shown in FIG. 7, the mounting base 21d is made up of a substantially disk-shaped main body h1, a male screw portion h2 extending downward from substantially the center of the main body 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. In addition, the user can fix the antenna device main body 1 to an installation stand (not shown) provided at a base station or the like by inserting the male screw portion h2 into a hole in the installation stand and tightening it with the nut portion h3.

[0061] FIG. 6(b) shows an example in which a pair of electrode plates 21a are arranged in a direction sandwiching the antenna device main body 1 (in the front-rear direction).

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

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

[0064] As a result, by arranging each electrode plate 21a in the front and rear of the antenna device main body 1 and abutting each suspension portion n1 against the left and right end faces of the antenna device main body 1, each first through hole m1 and each communication hole are connected, and by inserting and fastening fastening members s (bolts or nuts) into these holes, each electrode plate 21a is attached to the antenna device main body 1.

[0065] The configurations of the support base 21c and the mounting base 21d are the same as those explained using FIG. 6(a), and therefore will not be explained again.

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

[0067] <<<Second Attachment 22>>> As shown in FIG. 8, the 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 surface of the grip portion 22a facing the antenna device main body 1 has a predetermined uneven shape so that it fits comfortably in the user's hand.

[0070] The bracket 22b is a substantially plate-shaped member, and is provided with communication holes (not shown) that can communicate with the second through holes m2. As a result, each of the first through holes m2 communicates with each of the communication holes, and the second attachment 22 is attached to the antenna device main body 1 by inserting and fastening a fastening member s (bolt or nut) therethrough.

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

[0072] By using the second attachment 22 including the grip portion 22a described above, the user can carry the antenna device main body 1 by holding the grip portion 22a without narrowing the radiation width of the radio waves. This makes it easier for the user to search for an area where the antenna device main body 1 should be installed.

[0073] <Effects> According to the above embodiment, a so-called dipole antenna can be constructed as an approximately flat plate-shaped body using the dielectric substrate D and each antenna element A1, A2, so that the antenna device main body 1 can be manufactured lightweight and inexpensively while obtaining good band characteristics as an antenna.

[0074] Furthermore, the tapered region t in the gap G stabilizes the impedance of the antenna device main body 1, and provides an upward radiation pattern for radio waves while also providing good band characteristics.

[0075] Furthermore, since the side end face f1 and the side end face f2 are arranged on approximately the same plane, a deeper and more favorable band characteristic can be obtained.

[0076] Moreover, the open window R can suppress dielectric loss and obtain better gain.

[0077] Furthermore, by setting the number of vias v drilled corresponding to each step in the staircase region G2 to three, the Q value increases and stabilizes, and deeper and better band characteristics can be obtained.

[0078] In addition, the attachments 21 and 22 can be attached to the antenna device main body 1 using the mounting portion m, which can improve the convenience of the antenna device main body 1 depending on the situation, such as installation at a base station or searching for an installation location.

[0079] <Example of change> In addition, the word "abbreviated" in the application documents is a concept that means that the shape that follows has been chamfered or rounded, and that the elements that make up the shape have been deformed or changed in length within a range that does not impede the purpose of the shape. Furthermore, the shapes and dimensions of the components shown in the above-described embodiment are merely examples and can be modified in various ways based on design requirements and the like.

[0080] For example, in the above example shown in FIG. 5, the side end faces f1 and f2 are arranged on approximately the same plane, but the arrangement is not limited to this. The feed element surface portion A11 and the feed element surface portion A12 may overlap slightly in the thickness of the dielectric substrate in the slit region G1 when viewed from the front.

[0081] This modification will be described in detail with reference to FIG. In FIG. 10, (a) is a front view of the modified example, (b) is an enlarged view of the square dotted line frame in (a), and (c) is an enlarged cross-sectional view taken along line QQ'. Also, Figure 10(b) is an enlarged view centered on the first slit region G11, and the outer shape of the power supply element surface portion A11 on the front side is shown by a solid line, and the outer shape of the power supply element surface portion A12 on the back side is shown by a dashed dotted line.

[0082] As shown in FIG. 10(b), the feed element surface A11 and the feed element surface A12 overlap each other in the slit region G1 by a length L1 in the vertical direction. As shown in FIG. 10(c), the feed element surface A11 and the feed element surface A12 overlap each other in the slit region G1 by a length L2 in the left-right direction. The length L1 is preferably λ / 9, and the length L2 is preferably λ / 1500. [Explanation of symbols]

[0083] X Antenna Device 1 Antenna unit body D Dielectric Substrate A1 First antenna element A11 Feed element surface A12 Parasitic element surface A2 Second antenna element A21 Feed element surface A22 Parasitic element surface part G gap part G1 Stairs area G2 slit area v via 2 Attachments 21 First Attachment 22 Second Attachment

Claims

1. an antenna device main body for transmitting and receiving radio waves; the antenna device main body includes a substantially flat-plate-shaped dielectric substrate, a substantially flat-plate-shaped first antenna element laminated on one surface of the dielectric substrate, and a substantially flat-plate-shaped second antenna element laminated on the other surface of the dielectric substrate; the first antenna element and the second antenna element each include a feed element surface portion constituting a feed element and a parasitic element surface portion constituting a parasitic element, the feed element surface portion of the first antenna element and the feed element surface portion of the second antenna element, and the parasitic element surface portion of the first antenna element and the parasitic element surface portion of the second antenna element are arranged to face each other with the dielectric substrate interposed therebetween, the feed element surface portion and the parasitic element surface portion of each of the antenna elements are disposed adjacent to each other at a predetermined interval by providing a gap portion therebetween; the gap portion is formed with a substantially elongated slit region and a step region that is connected to one end of the slit region and increases the distance between the feed element surface portion and the parasitic element surface portion in a step-like manner as the gap portion moves away from the one end of the slit region, the feed element surface portions and the opposing parasitic element surface portions are electrically connected to each other by vias drilled along the outer periphery of each of the feed element surface portions, The vias are drilled corresponding to the steps in the staircase region.

2. the slit region is formed with a first slit region that is connected to the staircase region and separates the feed element surface portion and the parasitic element surface portion along the left-right direction, and a second slit region that separates the feed element surface portion and the parasitic element surface portion along the up-down direction, The first slit region is configured to extend substantially linearly, The antenna device according to claim 1 , wherein the second slit region has a tapered region extending substantially linearly so as to form an acute angle with the direction in which the first slit region extends.

3. 3. The antenna device according to claim 2, wherein a side end face of the feed element surface portion of the first antenna element that forms the first slit region and a side end face of the feed element surface portion of the second antenna element that forms the first slit region are arranged on approximately the same plane.

4. The step region is provided with an opening formed by hollowing out the dielectric substrate; 2. The antenna device according to claim 1, wherein the open window is formed to have a tapered shape as it approaches the slit region.

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

6. 2. The antenna device according to claim 1, wherein said antenna device main body is provided with a mounting portion for mounting an attachment for supporting said antenna device main body.

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