Antenna equipment

Abstract

This technology provides an improvement in antenna characteristics over a wide frequency range without increasing the size of the reflector. [Solution] The antenna device comprises a radiator and a reflector. The radiator is configured to transmit or receive linearly polarized waves. The reflector is made of a plate-shaped member using an electrical conductor and is positioned opposite the radiator at a distance from it. The reflector also comprises a frame and partitions. The frame is arranged in a grid pattern so that multiple slots of the same size and shape are formed. The partitions are provided in one or more slots and are connected to the frame forming the slots at one or more points.

Description

Technical Field

[0001] The present disclosure relates to an antenna device composed of a plate-like member using an electrical conductor having a plurality of openings on the plate surface of a reflector and including a radiator and a reflector.

Background Art

[0002] As an antenna device for receiving television broadcasts used in ordinary households, there is known a device in which a radiator and a reflector are formed of plate-like members using an electrical conductor, and these are housed in a case in a facing state. In Patent Document 1, as a reflector, a plate-like member using an electrical conductor having a large number of diamond-shaped openings is used, and by expanding the frequency bandwidth of radio waves that can be reflected by the reflector to the lower frequency side, a broadband radio wave such as a television broadcast wave can be received by one antenna device.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, the conventional technology has a structure in which openings of the same size are arranged, and it can only correspond to a specific one frequency according to the size of the openings. For this reason, there has been a problem that it is difficult to improve the characteristics on the medium and high frequency sides while maintaining the characteristics on the low frequency side improved by the conventional technology.

[0005] One aspect of the present disclosure provides a technique for improving antenna characteristics in a wide frequency range without increasing the size of the reflector.

Means for Solving the Problems

[0006] One aspect of the present disclosure is an antenna device comprising a radiator and a reflector. The radiator is configured to transmit or receive linearly polarized waves. The reflector is composed of a plate-shaped member made of an electrical conductor and is positioned opposite the radiator at a distance from it. The reflector also comprises a frame and partitions. The frame is arranged in a grid pattern so that a plurality of slots of the same size and shape are formed. The partitions are provided in one or more slots and are connected at one or more points to the frame forming the slots.

[0007] With this configuration, the characteristics of the reflector, and consequently the characteristics of the antenna device, can be adjusted in various ways by appropriately selecting the size and shape of the slots, the structure of the partitions, and the position where the partitions are installed.

[0008] In one aspect of this disclosure, a slot without a partition is designated as a first slot, and a slot with a partition is designated as a second slot. The first and second slots may be arranged to form a first detour path and a second detour path, whose path lengths differ from a basic path whose path length is determined by the width of the reflector along the polarization direction of the radiator. As a result, the reflector is configured to reflect radio waves of wavelengths corresponding to the path lengths of the basic path, the first detour path, and the second detour path. The polarization direction may be a direction parallel to the polarization plane of linearly polarized waves transmitted or received by the radiator. The first detour path may be a path through which electromagnetic waves propagate along the frame between two points located at both ends of the polarization direction of the reflector. The second detour path is a path through which electromagnetic waves propagate along the frame and partition between two points located at both ends of the polarization direction of the reflector, and is the first The route may be any route that excludes the detour.

[0009] With this configuration, radio waves of different wavelengths can be reflected in the basic path, the first bypass path, and the second bypass path, respectively. In one aspect of this disclosure, the reference point may be a point on the reflector's surface opposite the center of the radiator. The second slot may be arranged on the reflector's surface in a point-symmetric manner with respect to the reference point, or in a line-symmetric manner with respect to a line passing through the reference point. Such a configuration makes it possible to achieve antenna characteristics that are symmetric with respect to the reference point or the line passing through the reference point.

[0010] In one aspect of this disclosure, the direction orthogonal to the polarization direction may be defined as the depolarization direction. The second slot may be arranged on a line along the depolarization direction passing through a reference point. With such a configuration, the directivity gain can be improved compared to conventional devices that do not have a second slot.

[0011] In one aspect of this disclosure, the direction perpendicular to the polarization direction may be defined as the depolarization direction. The second slot may be arranged on a line along the depolarization direction at each end of the polarization direction. With such a configuration, the VSWR can be improved compared to a conventional device without the second slot.

[0012] In one aspect of this disclosure, the external shape of the slot may be polygonal or elliptical. In one aspect of this disclosure, the partition may have a linear shape or a shape that forms an arbitrary contour.

[0013] In one aspect of the present disclosure, the partition may have a shape that forms a polygonal or elliptical contour and may be arranged to be inscribed within a frame that forms a slot. [Brief explanation of the drawing]

[0014] [Figure 1] This is a side view of an antenna device fixed to a wall, seen from the side. [Figure 2] This is a plan view of an antenna device fixed to a wall, seen from above. [Figure 3] This is a perspective view showing the configuration of the radiator and reflector that make up the antenna device. [Figure 4]It is an explanatory diagram illustrating a conventional pattern (comparative pattern) of slots formed in a reflector and patterns (Patterns 1 to 3) according to the present disclosure. [Figure 5] It is an explanatory diagram illustrating patterns (Patterns 4 to 6) according to the present disclosure of slots formed in a reflector. [Figure 6] It is a table showing values of directivity gain and VSWR calculated by simulation for an antenna device adopting a comparative pattern and Patterns 1 to 6. [Figure 7] It is a graph showing the results of calculating directivity gain and VSWR by simulation for Patterns 1 to 3. [Figure 8] It is an explanatory diagram illustrating patterns (Patterns 7, 8) of slots formed in a reflector in a radiator of the second embodiment. [Figure 9] It is a graph showing the results of calculating directivity gain, VSWR, front-to-back ratio, and half-power angle by simulation for an antenna device adopting a comparative pattern and Patterns 7, 8. [Figure 10] It is an explanatory diagram illustrating other shapes of the adjustment partition body. [Mode for Carrying Out the Invention]

[0015] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. [1. First Embodiment] [1-1. Configuration] As shown in FIGS. 1 and 2, the antenna device 2 of the present embodiment has a synthetic resin case 10 and.

[0016] The case 10 is fixed to the wall surface 100 using a support piece 14 protruding from the bottom 12 of the case 10 and a fixing piece 16 fixed to the wall surface 100 to be attached. Specifically, the support piece 14 is fitted into the fixing piece 16, and the fitting portion is fixed using a fixture 18 composed of a bolt and a nut so as to be rotatable around the central axis in the vertical direction.

[0017] Case 10 contains a pair of radiators 20A and 20B and a pair of reflectors 50A and 50B. The pair of radiators 20A and 20B constitute a stacked radiator. Reflector 50A is positioned opposite radiator 20A, and reflector 50B is positioned correspondingly to radiator 20B.

[0018] Since radiators 20A and 20B have similar configurations, they will be referred to as "radiator 20" unless there is a need to distinguish between them. Similarly, since reflectors 50A and 50B have similar configurations, they will be referred to as "reflector 50" unless there is a need to distinguish between them.

[0019] As shown in Figure 3, the radiator 20 is constructed by forming openings 26 and 28 for forming a pair of loops 22 and 24, and connecting holes 30 for connecting these openings 26 and 28, in a rectangular metal plate which is an electrical conductor.

[0020] In the radiator 20, power supply points 32 and 34 are formed on both sides of the connecting hole 30, respectively, for connecting connecting members 42 and 44 made of electrical conductors. The radiators 20A and 20B are arranged with the surfaces of their respective metal plates on the same plane, and the loop 24 (i.e., opening 28) sides of each metal plate facing each other, spaced apart.

[0021] Radiators 20A and 20B are electrically connected via connecting members 42 and 44. Connecting member 42 connects the feed points 32 of radiators 20A and 20B to each other, and connecting member 44 connects the feed points 34 of radiators 20A and 20B to each other. The midpoints of each connecting member 42 and 44 serve as feed points 46 and 48 common to both radiators 20A and 20B, to which power supply cables (not shown) are connected.

[0022] In the following, the direction in which radiators 20A and 20B are aligned is referred to as the Y-axis direction. The direction perpendicular to the Y-axis and along the plate surface of radiator 20 is referred to as the X-axis direction. The direction perpendicular to the X-axis direction and the Y-axis direction is referred to as the Z-axis direction.

[0023] Radiator 20B is positioned in the same orientation as radiator 20A, but inverted along the Y-axis. Radiator 20 transmits or receives linearly polarized waves with a polarization plane parallel to the X-axis. Radiator 20 and reflector 50 are positioned with a gap between them along the Z-axis.

[0024] The reflector 50 is manufactured, for example, by bending a rectangular metal plate, which is an electrical conductor, into a U-shape. The reflector 50 comprises a reflector body 52 and side wall portions 54 and 56. The reflector body 52 is the part that is positioned so that its plate surface is aligned with the X-Y plane. The reflector body 52 is large enough to cover the entire plate surface of the opposing radiators 20. The side wall portions 54 and 56 are parts that protrude in the Z-axis direction by bending both ends of the reflector body 52 in the X-axis direction.

[0025] Reflectors 50A and 50B are arranged in the same way as radiators 20A and 20B, aligned along the Y-axis, with reflector 50B being positioned as an inverted version of reflector 50A along the Y-axis. In the following, the side of reflector 50B as seen from reflector 50A will be referred to as the reflector 50B side, and the side of reflector 50A as seen from reflector 50B will be referred to as the center side.

[0026] The reflector body 52 comprises an outer frame 521 that forms the outer circumference of the reflector body 52, and an inner frame 522 that is arranged in a grid pattern inside the outer frame 521 so that multiple rhombus-shaped openings (hereinafter referred to as slots) SL of the same size and shape are formed.

[0027] In the following, multiple slots SL arranged in a line along the X-axis will be called the X-axis slot group, and multiple slots SL arranged along the Y-axis will be called the Y-axis slot group. Here, we assume that there are six X-axis slot groups SX1 to SX6 and five Y-axis slot groups SY1 to SY5, as shown in the comparison pattern in Figure 4 (i.e., the reflector of the conventional technology).

[0028] As shown in patterns 1 to 6 in Figures 4 and 5, some slots SL are provided with a partition 523 within the slot SL to adjust the shape of the slot SL. Hereinafter, a slot SL without a partition 523 will be referred to as the first slot SL1, and a slot SL with a partition 523 will be referred to as the second slot SL2. The position where the second slot SL2 is formed and the shape of the partition 523 are arbitrary.

[0029] Here, the partition 523 is formed in a cross shape, that is, by connecting the midpoints of opposing inner frame bodies 522 in the four inner frame bodies 522 that form the outer perimeter of the slot SL of interest. In other words, inside the second slot SL2, which is the slot SL in which the partition 523 is provided, four sub-slots are formed, each having a size of approximately 1 / 4 that of the first slot SL1.

[0030] Furthermore, Figures 4 and 5 illustrate six different patterns in which the second slot SL2 is formed. In Pattern 1, each slot SL belonging to the Y-axis slot group SY3 is configured as the second slot SL2. In other words, each slot SL located at the center in the X-axis direction in the reflector 50 is designated as the second slot SL2.

[0031] In Pattern 2, each slot SL belonging to the Y-axis slot groups SY1 and SY5 is configured as the second slot SL2. In other words, in the reflector 50, each slot SL located at both ends in the X-axis direction is designated as the second slot SL2.

[0032] In Pattern 3, each slot SL belonging to the Y-axis slot groups SY2 and SY4 is configured as a second slot SL2. In other words, in the reflector 50, each slot SL located in the X-axis direction other than the center and both ends is designated as a second slot SL2.

[0033] In Pattern 4, each slot SL belonging to the X-axis slot group SX1 is configured as a second slot SL2. In other words, in the reflector 50, each slot SL located at the central end in the Y-axis direction is designated as a second slot SL2.

[0034] In Pattern 5, each slot SL belonging to the X-axis slot group SX3 is configured as a second slot SL2. In other words, in the reflector 50, each slot SL located between the central end and the outer end opposite the central end in the Y-axis direction is designated as a second slot SL2.

[0035] In Pattern 6, each slot SL belonging to the X-axis slot group SX5 is configured as a second slot SL2. In other words, in the reflector 50, each slot SL located at the outer end in the Y-axis direction is designated as a second slot SL2.

[0036] With the reference point F being the point on the plate surface of the pair of reflectors 50A and 50B facing the center point of the pair of radiators 20A and 20B, the second slot SL2 in patterns 1 to 6 is, The arrangement is set to be point-symmetric with respect to the reference point F, line-symmetric with respect to the Y-axis passing through the reference point F, or line-symmetric with respect to the X-axis passing through the reference point F.

[0037] [1-2. Operation] Here, the basic path is defined as the electromagnetic wave propagation path whose path length is the dimension of the reflector body 52 along the X-axis. The first detour path is defined as the path through which electromagnetic waves propagate along the inner frame 522 between two points located at both ends of the reflector body 52 in the X-axis direction. The first detour path can also be described as a path in which at least a portion of the basic path is replaced by a path that bypasses the slot SL along the inner frame 522. Furthermore, the second detour path is defined as the path through which electromagnetic waves propagate along the inner frame 522 and partition 523 between two points located at both ends of the reflector body 52 in the X-axis direction, excluding the path that is entirely identical to the first detour path. The second detour path can also be described as a path in which at least a portion of the first detour path is replaced by a path that passes through the partition 523 and crosses the slot, or a path that passes through the partition 523 is added to the first detour path.

[0038] In other words, the first and second detour routes have longer path lengths than the basic route. Furthermore, the second detour route has more path patterns than the first detour route, and there are path patterns with different path lengths than the first detour route. In short, the reflector 50 is configured to reflect radio waves of wavelengths corresponding to the path lengths of the basic route, the first detour route, and the second detour route.

[0039] The path length of the basic path is set to a length suitable for reflecting the upper frequency limit of electromagnetic waves transmitted or received by the antenna device 2. By appropriately selecting the shape and size of the slot SL, the shape of the partition 523, and the method of attachment to the inner frame 522, the reflector 50, and consequently the characteristics of the antenna device 2, are changed.

[0040] [1-3. Measurement] By placing experimental radiators 20A and 20B in front of each reflector 50A and 50B shown in the comparison patterns in Figures 4 and 5, and in patterns 1 to 6, an antenna device 2 for receiving television broadcasts (UHF band, frequency: 470MHz to 770MHz) was constructed, and simulations were performed.

[0041] In the reflector 50, the length of slot SL in the X-axis direction is 60 mm, and the length in the Y-axis direction is 80 mm. The dimensions of the reflector body 52 are 290 mm in the X-axis direction and 230 mm in the Y-axis direction. The height of the side wall portions 54 and 56 from the plate surface of the reflector body 52 is 15 mm.

[0042] The shape and size of slot SL, the arrangement of the second slot SL2, and the structure of the partition 523 in the second slot SL2 are appropriately selected according to the distance between the radiator 20 and the reflector 50 and the operating frequency.

[0043] Figure 6 shows the antenna characteristics of antenna device 2, specifically the directional gain and VSWR (i.e., standing wave ratio), calculated through simulation. Figure 7 is a graph based on the calculation results for the comparison pattern and pattern 1.2.

[0044] As shown in Figure 7, when using the reflector 50 of pattern 1, the directivity gain is improved (i.e., increased) across the entire operating frequency band compared to a conventional device using the reflector of the comparison pattern. Furthermore, when using the reflector 50 of pattern 2, the VSWR in the mid-range to low-frequency range of the operating frequency band is improved (i.e., decreased) compared to a conventional device.

[0045] Furthermore, by changing the position where the second slot SL2 is formed, as shown in Figure 6, It can be seen that the frequency characteristics of directional gain and VSWR change in various patterns. [1-4. Correspondence of Terms] In this embodiment, the X-axis direction corresponds to the polarization direction of this disclosure, and the Y-axis direction corresponds to the non-polarization direction of this disclosure.

[0046] [1-5. Effects] The first embodiment described in detail above provides the following effects. (1a) In the antenna device 2, a portion of the slot SL of the reflector 50 is formed as the second slot SL2. Therefore, compared to a conventional device in which all of the slot SL of the reflector 50 is the first slot SL1, it is possible to increase the number of frequencies at which the reflector 50 resonates in the polarization direction of the radio waves transmitted or received by the radiator 20 without increasing the size of the reflector 50. As a result, while maintaining the low-frequency antenna characteristics improved by the conventional device, it is possible to change the characteristics of the reflector 50 and, consequently, the antenna characteristics of the antenna device 2 (for example, the frequency characteristics of directivity gain and VSWR). In other words, it is possible to improve the characteristics of a specific frequency range in the operating frequency band.

[0047] [2. Second Embodiment] [2-1. Differences from the First Embodiment] The second embodiment has the same basic configuration as the first embodiment, so the differences will be explained below. Note that the same reference numerals as in the first embodiment indicate the same components, and refer to the preceding description.

[0048] In the first embodiment described above, the shape of the partition 523 is fixed, and the arrangement of the slots SL that become the second slots SL2 is varied to change the antenna characteristics of the antenna device 2. In contrast, the second embodiment differs from the first embodiment in that the arrangement of the slots SL that become the second slots SL2 is fixed, and the structure of the partition 523 is varied to change the antenna characteristics of the antenna device 2.

[0049] Figure 8 illustrates two types of reflectors 50 (hereinafter referred to as patterns 7 and 8) in which the arrangement of the second slot SL2 is the same, but the shape of the partition 523 in the second slot SL2 is different. In patterns 7 and 8, each slot SL belonging to the X-axis slot group SX2, SX4, and SX5 is designated as the second slot SL2.

[0050] However, in the slots SL located at both ends of the X-axis slot group SX5, there are parts where the outer frame 521 protrudes into the slot SL, and in those parts, the partition 523 is partially omitted. A linear partition is inserted into the non-rhomboid slot formed by the inner frame 522 and outer frame 521 of slot SL, which is located in the center of the X-axis slot group SX1.

[0051] At the boundary between the roughly diamond-shaped slots located at both ends of the X-axis slot group SX3 and the triangular slots located at both ends of the X-axis slot group SX2, the inner frame 522 is omitted. In Pattern 7, the partition 523 has a cross shape, similar to the first embodiment.

[0052] In pattern 8, the partition 524 has a rectangular shape, and each of the four vertices of the rectangle is connected to the midpoint of each of the four sides of the inner frame 522 that forms the slot SL. In other words, the partition 524 forms a rectangular slot that is inscribed within the rhombus-shaped slot SL.

[0053] [2-2. Measurement] A comparison pattern was obtained by removing partitions 523 and 524 from patterns 7 and 8, and a simulation was performed using the reflectors 50A and 50B of patterns 7 and 8 under the same conditions as in the first embodiment. In the simulation, the directivity gain, VSWR, front-to-back ratio, and angle at half maximum were examined. The calculation was performed. Figure 9 is a graph based on the calculation results.

[0054] [2-3. Effects] The second embodiment described in detail above provides the following effects. (2a) Even if the arrangement of the second slot SL2 is the same, by appropriately selecting the structure of the partitions 523 and 524, it is possible to partially adjust the directivity gain and VSWR while maintaining the improved antenna characteristics obtained by using the comparison pattern.

[0055] [3. Other Embodiments] Although embodiments of the present disclosure have been described above, the present disclosure is not limited to the embodiments described above and can be implemented in various modified forms.

[0056] (3a) In the above embodiment, a cross-shaped partition 523 and a rectangular partition 524 connected to the inner frame 522 at four points have been illustrated, but the partitions are not limited to these. For example, as shown in the top row of Figure 10, a partition of any shape may be connected to the inner frame 522 at one point. Here, linear and elliptical partitions are illustrated. The point where the partition is connected may be the vertex of the slot SL formed by the inner frame 522, or it may be an edge of the slot SL.

[0057] Furthermore, as shown in the second row of Figure 10, for example, a partition of any shape may be connected to the inner frame 522 at two points. Here, examples include a linear partition connecting any two points on the inner frame 522, and a partition forming a polygonal outline with vertices not connected to the inner frame 522. Although not shown in the illustration, the partition may also be connected to two points on the same side of the inner frame 522 that forms the slot SL.

[0058] Furthermore, as shown in the third and fourth rows of Figure 10, for example, the structure may be such that partitions of any shape are connected to the inner frame 522 at three or four points, or even at five or more points. Here, partitions forming triangular, square, circular, and octagonal outlines are given as examples.

[0059] (3b) In the above embodiment, the shape of the slot SL provided in the reflectors 50A and 50B does not necessarily have to be rhombic, and any shape such as any polygon or ellipse can be used.

[0060] (3c) In the above embodiment, the radiators 20A and 20B were described as being made of a double-loop type radiator (so-called skeleton slot radiator) made by forming two openings 26 and 28 in a metal plate which is an electrical conductor. However, the radiator may be a dipole type or a planar antenna of another type.

[0061] (3d) In the above embodiment, the reflectors 50A and 50B were described as having slots SL provided in a metal plate which is an electrical conductor. However, they may also be constructed by providing slots SL in a plate-shaped member made of a non-electrical conductor such as synthetic resin, and providing an electrical conductor (paint, metal foil, etc.) on its surface.

[0062] (3e) Multiple functions of one component in the above embodiment may be realized by multiple components, or one function of one component may be realized by multiple components. Alternatively, multiple functions of multiple components may be realized by one component, or one function realized by multiple components may be realized by one component. Also, some of the configurations of the above embodiment may be omitted. Also, at least some of the configurations of the above embodiment may be added to or replaced with the configurations of other above embodiments. You may do so.

[0063] (3f) In addition to the antenna device described above, this disclosure can also be implemented in various forms, such as a system that uses the antenna device as a component, or a method for adjusting antenna characteristics. [4. The technical concepts disclosed herein] [Item 1] A radiator configured to transmit or receive linearly polarized waves, A reflector is made of a plate-shaped member using an electrical conductor and is positioned opposite the radiator at a distance from it, Equipped with, The reflector is, A frame structure arranged in a grid pattern so that multiple slots of the same size and shape are formed, A partition body provided in one or more of the aforementioned slots and connected at one or more points to the frame forming the slot, An antenna device equipped with the following features.

[0064] [Item 2] The antenna device described in item 1, The slot without the partition is designated as the first slot, and the slot with the partition is designated as the second slot. The first and second slots are arranged such that a first and second bypass path, each with a different path length from the basic path, whose path length is determined by the width of the reflector along the polarization direction of the radiator, is formed, and the reflector is configured to reflect radio waves of wavelengths corresponding to the path lengths of the basic path, the first bypass path, and the second bypass path. The polarization direction is parallel to the polarization plane of the linearly polarized wave transmitted or received by the radiator. The first detour path is a path through which electromagnetic waves propagate along the frame between two points located at both ends of the reflector in the polarization direction, The second detour path is the path obtained by excluding the first detour path from the path through which electromagnetic waves propagate along the frame and partition between two points located at both ends of the reflector in the polarization direction. Antenna device.

[0065] [Item 3] The antenna device described in item 2, The reference point is a point on the plate surface of the reflector that is opposite to the center of the radiator. The second slot is arranged on the plate surface of the reflector so as to be point-symmetric with respect to the reference point, or line-symmetric with respect to a line passing through the reference point. Antenna device.

[0066] [Item 4] The antenna device described in item 3, The direction perpendicular to the polarization direction is defined as the depolarization direction. The second slot is positioned on a line along the non-polarized direction passing through the reference point. Antenna device.

[0067] [Item 5] The antenna device described in item 3, The direction perpendicular to the polarization direction is defined as the depolarization direction. The second slot is arranged on a line along the depolarization direction at each of the two ends in the polarization direction. Antenna device.

[0068] [Item 6] An antenna device described in any one of items 1 to 5, The external shape of the aforementioned slot is polygonal or elliptical. Antenna device.

[0069] [Item 7] An antenna device described in any one of items 1 through 6, The partition has a linear shape or a shape that forms an arbitrary contour. Antenna device.

[0070] [Item 8] The antenna device described in item 7, The partition body has a shape that forms a polygonal or elliptical outline and is arranged to be inscribed within the frame that forms the slot. Antenna device. [Explanation of symbols]

[0071] 2...Antenna device, 10...Case, 12...Bottom, 14...Support piece, 16...Fixing piece, 18...Fixing device, 20...Radiator, 22,24...Loop, 26,28...Opening hole, 30...Connecting hole, 32,34,46,48...Feed point, 42,44...Connecting member, 50...Reflector, 52...Reflector body, 54,56...Side wall, 521...Outer frame, 522...Inner frame, 523,524...Partition, SL...Slot, SL1...First slot, SL2...Second slot, SX1~SX6...X-axis slot group, SY1~SY5...Y-axis slot group.

Claims

1. A radiator configured to transmit or receive linearly polarized waves, A reflector is made of a plate-shaped member using an electrical conductor and is positioned opposite the radiator at a distance from it, Equipped with, The reflector is, A frame structure arranged in a grid pattern so that multiple slots of the same size and shape are formed, A partition body provided in one or more of the aforementioned slots and connected at one or more points to the frame forming the slot, An antenna device equipped with the following features.

2. The antenna device according to claim 1, The slot without the partition is referred to as the first slot, and the slot with the partition is referred to as the second slot. The first and second slots are arranged such that a first and second bypass path are formed, each having a different path length from the basic path, whose path length is determined by the width of the reflector along the polarization direction of the radiator. The reflector is configured to reflect radio waves of wavelengths corresponding to the path lengths of the basic path, the first bypass path, and the second bypass path. The polarization direction is parallel to the polarization plane of the linearly polarized wave transmitted or received by the radiator. The first detour path is a path through which electromagnetic waves propagate along the frame between two points located at both ends of the reflector in the polarization direction, The second detour path is the path obtained by excluding the first detour path from the path through which electromagnetic waves propagate along the frame and partition between two points located at both ends of the reflector in the polarization direction. Antenna device.

3. The antenna device according to claim 2, The reference point is a point on the plate surface of the reflector that is opposite to the center of the radiator. The second slot is arranged on the plate surface of the reflector so as to be point-symmetric with respect to the reference point, or line-symmetric with respect to a line passing through the reference point. Antenna device.

4. The antenna device according to claim 3, The direction perpendicular to the polarization direction is defined as the depolarization direction. The second slot is positioned on a line along the non-polarized direction passing through the reference point. Antenna device.

5. The antenna device according to claim 3, The direction perpendicular to the polarization direction is defined as the depolarization direction. The second slot is positioned on a line along the depolarization direction at each of the two ends in the polarization direction. Antenna device.

6. An antenna device according to any one of claims 1 to 5, The external shape of the aforementioned slot is polygonal or elliptical. Antenna device.

7. An antenna device according to any one of claims 1 to 5, The partition has a linear shape or a shape that forms an arbitrary contour. Antenna device.

8. The antenna device according to claim 7, The partition body has a shape that forms a polygonal or elliptical outline and is arranged to be inscribed within the frame that forms the slot. Antenna device.

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