Radiating element for antenna and antenna device
By introducing a regular octagonal reflector into the bow antenna, the problem of beam width deviation in the bow antenna is solved, and the miniaturization of the antenna device and effective suppression of the beam width are achieved.
Patent Information
- Application Number
- CN202410755644.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Priority Date
- 2023-06-13
- Filing Date
- 2024-06-12
- Publication Date
- 2024-12-13
AI Technical Summary
The beam widths in the element direction and vertical direction in the bow antenna have a large difference, resulting in a problem of beam width deviation.
Design a radiation element for an antenna, adopt two bow antennas configured in a cross shape, and add a reflector plate with a regular octagonal cross-sectional shape thereon, and the antenna portion is located near the opening portion of the reflector plate to suppress deviation of beam width .
By using a regular octagonal reflector, deviations in beam width can be effectively suppressed, and the antenna device is miniaturized because the shape of the reflector is closely arranged.
Smart Images
Figure CN119133830A_ABST
Abstract
Description
Technical Field
[0001] The present disclosure relates to a radiating element for an antenna and an antenna device. Background Art
[0002] A bow-tie antenna is disclosed in Patent Document 1. When two bow-tie antennas are arranged in a cross shape, they can be arranged in a space-saving manner as antenna elements having orthogonal polarizations.
[0003] Prior art literature
[0004] Patent Literature
[0005] Patent Document 1: Japanese Patent Application Publication No. 2009-10471 Summary of the invention
[0006] Problems to be solved by the invention
[0007] Fig.11 The bow-tie antenna 201 shows the element direction D1, which is the feeding direction, and the vertical direction D2 perpendicular to the element direction D1. The bow-tie antenna 201 has a problem that the difference between the beam width in the element direction D1 and the beam width in the vertical direction D2 (hereinafter referred to as beam width deviation) is large.
[0008] In one embodiment of the present invention, it is preferable to provide an antenna radiating element and an antenna device capable of suppressing deviation in beam width.
[0009] Solutions to Solve Problems
[0010] One embodiment of the present disclosure is a radiating element for an antenna, comprising: an antenna portion having two bow-tie antennas arranged in a cross shape; and a reflector. The reflector has: a cylindrical portion, the cross-sectional shape of which is a regular octagon in a cross section perpendicular to the axial direction; a bottom portion closing one end of the cylindrical portion in the axial direction; and an opening portion provided at an end of the cylindrical portion opposite to the one end. The antenna portion is located near the opening portion.
[0011] One embodiment of the present invention is a radiating element for an antenna that can suppress variations in beam width. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Figure 1A It is a perspective view showing the appearance of the antenna device. Figure 1B This is a three-dimensional diagram showing a plurality of antenna radiating elements arranged inside the antenna device.
[0013] Figure 2 It is a three-dimensional diagram showing the structure of a radiating element for an antenna.
[0014] Figure 3 It is an explanatory diagram showing a radiating element for an antenna when viewed from a direction Z1.
[0015] Figure 4 It is a perspective view showing the structure of a radiating element for an antenna in a state where an antenna portion is removed.
[0016] Figure 5 It is a perspective view showing the structure of a radiating element for an antenna in a state where an antenna portion is removed.
[0017] Figure 6 It is a perspective view showing the structure of a radiating element for an antenna in a state where an antenna portion is removed.
[0018] Figure 7 It is a perspective view showing the structure of a radiating element for an antenna in a state where an antenna portion is removed.
[0019] Figure 8 It is a perspective view showing the structure of a radiating element for an antenna in a state where a cylindrical portion is removed.
[0020] Fig. 9 This is an explanatory diagram showing a state where a plurality of antenna radiating elements are arranged in a staggered pattern.
[0021] Fig.10 It is an explanatory diagram showing the position of the antenna unit with respect to the reflector.
[0022] Fig.11 This is an explanatory diagram showing the element orientation and vertical orientation of a bow-tie antenna.
[0023] Explanation of symbols
[0024] 1—antenna device, 4—radiating element for antenna, 21a—mounting accessory, 22—radome, 23a, 23b—antenna cap, 25a, 25b—coaxial cable adapter, 31—bottom plate, 34a—side plate, 41—antenna portion, 43—substrate, 45A, 45B, 45C, 45D—radiating element, 46, 48—bow-tie antenna, 47—center, 49A, 49B, 49C, 49D—through hole, 51—dielectric substrate, 53A, 53B, 53C, 53D—unit substrate, 55—bottom, 57—center, 59A, 59B, 59C, 59D—convex portion, 61, 63, 83, 85—conductor pattern, 96—opening portion, 97—cylindrical portion, 98—reflector, 98A—side, 99—central axis, 101—area. DETAILED DESCRIPTION
[0025] Illustrative embodiments of the present disclosure are described with reference to the accompanying drawings.
[0026] <First Embodiment>
[0027] 1. Structure of antenna device 1
[0028] based on Figure 1A as well as Figure 1B , the structure of the antenna device 1 is described. Figure 1B In the figure, the antenna portion 41 which is a part of the antenna radiating element 4 and the reflector 98 are omitted. The antenna device 1 is used as an antenna device for a mobile phone base station, for example.
[0029] like Figure 1A As shown, the antenna device 1 includes a cylindrical radome 22 and antenna caps 23a and 23b. Both ends of the radome 22 are closed by the antenna caps 23a and 23b.
[0030] The antenna device 1 includes mounting brackets 21a and 21b. The antenna device 1 is mounted on an antenna tower or the like using the mounting brackets 21a and 21b so that the longitudinal direction thereof becomes a vertical direction.
[0031] The antenna device 1 includes coaxial cable adapters 25a and 25b. The coaxial cable adapters 25a and 25b function as high-frequency signal transmission and reception terminals. The coaxial cable adapters 25a and 25b protrude from the antenna cap 23b to the outside. Figure 1B As shown, the antenna device 1 includes a plurality of antenna radiating elements 4 . The plurality of antenna radiating elements 4 are accommodated in the interior of the radome 22 .
[0032] The antenna device 1 includes a bottom plate 31 inside the antenna cover 22. A plurality of antenna radiating elements 4 are arranged in a row on the bottom plate 31. Side plates 34a and 34b are provided on both sides in the width direction of the bottom plate 31. The width direction is a direction orthogonal to the length direction of the antenna device 1. The bottom plate 31 has a function as a reflector that reflects electromagnetic waves radiated from the antenna radiating elements 4.
[0033] 2. Structure of antenna radiating element 4
[0034] based on Figure 2 to Figure 8 , the structure of the antenna radiation element 4 is described. Figure 2 , Figure 3 As shown, the antenna radiating element 4 includes an antenna unit 41. The antenna unit 41 includes a substrate 43 and four radiating elements 45A, 45B, 45C, and 45D. The substrate 43 is a regular octagonal plate made of a dielectric.
[0035] The radiation elements 45A, 45B, 45C, and 45D are formed on the main surface of the substrate 43. Figure 2 The conductor pattern of the main surface on the direction Z1 side shown. The main surface refers to a surface with a much larger area than other surfaces in a plate-like component. The direction Z1 is parallel to the thickness direction of the substrate 43.
[0036] The radiation elements 45A, 45B, 45C, and 45D are arranged so as to surround the center 47 of the substrate 43. The center 47 is the center when viewed from the direction Z1. Figure 3 The direction X1 shown extends. The direction X1 is parallel to the main surface of the substrate 43 and is perpendicular to the direction Z1.
[0037] Radiating element 45B extends from center 47 along Figure 3 The radiating element 45C extends in the direction X2 shown. The direction X2 is the opposite direction of the direction X1. The radiating element 45C extends from the center 47 along Figure 3 The radiating element 45D extends in the direction Y1 shown. The direction Y1 is parallel to the main surface of the substrate 43 and is orthogonal to the directions Z1, X1, and X2. Figure 3 The direction Y2 shown extends in the figure. The direction Y2 is the opposite direction of the direction Y1.
[0038] The radiation elements 45A, 45B, 45C, and 45D are each in the shape of an isosceles triangle, in which the vertex sandwiched between two sides of equal length is located on the center 47 side.
[0039] Radiating elements 45A and 45B form a bow-tie antenna 46. Radiating elements 45C and 45D form a bow-tie antenna 48. Bow-tie antennas 46 and 48 are arranged in a cross shape when viewed from direction Z1. Center 47 is the intersection of bow-tie antennas 46 and 48. Directions X1 and X2 are the extension directions of bow-tie antenna 46 and are the power supply directions. Directions Y1 and Y2 are the extension directions of bow-tie antenna 48 and are the power supply directions.
[0040] The antenna unit 41 includes through holes 49A, 49B, 49C, and 49D. The through holes 49A, 49B, 49C, and 49D penetrate the antenna unit 41 in the thickness direction. The through hole 49A is formed at a position on the center 47 side of the radiation element 45A. The through hole 49A is an elongated shape with the direction X1 as the longitudinal direction.
[0041] The through hole 49B is formed at a position on the side of the center 47 in the radiation element 45B. The through hole 49B is an elongated shape with the direction X2 being the longitudinal direction. The through hole 49C is formed at a position on the side of the center 47 in the radiation element 45C. The through hole 49C is an elongated shape with the direction Y1 being the longitudinal direction. The through hole 49D is formed at a position on the side of the center 47 in the radiation element 45D. The through hole 49D is an elongated shape with the direction Y2 being the longitudinal direction.
[0042] like Figure 2 , Figures 4 to 8As shown, the antenna radiating element 4 includes a dielectric substrate 51. The dielectric substrate 51 is located on the direction Z2 side with respect to the antenna portion 41. The direction Z2 is the opposite direction to the direction Z1. The dielectric substrate 51 is in contact with the main surface of the antenna portion 41 on the direction Z2 side. Figures 4 to 7 As shown, the dielectric substrate 51 includes unit substrates 53A, 53B, 53C, and 53D.
[0043] The unit substrate 53A is a plate-shaped portion extending from the center 57 of the dielectric substrate 51 in the direction X1 when viewed from the direction Z1. The center 57 is the center when viewed from the direction Z1. When viewed from the direction Z1, the center 57 coincides with the center 47 of the antenna portion 41. In addition, when viewed from the direction Z1, the unit substrate 53A extends from the center 57 toward the outer peripheral side of the antenna portion 41.
[0044] The thickness direction of the unit substrate 53A is parallel to the direction Y1 and the direction Y2. The basic shape of the unit substrate 53A is a rectangle. The unit substrate 53A has a convex portion 59A on the direction Z1 side and the center 57 side. The convex portion 59A protrudes in the direction Z1. The shape of the convex portion 59A is a rectangle.
[0045] The unit substrate 53B is a plate-like portion extending from the center 57 in the direction X2 when viewed from the direction Z1. In addition, when viewed from the direction Z1, the unit substrate 53B extends from the center 57 to the outer peripheral side of the antenna portion 41. The thickness direction of the unit substrate 53B is parallel to the direction Y1 and the direction Y2. The basic form of the unit substrate 53B is a rectangle. The unit substrate 53B has a convex portion 59B on the direction Z1 side and the center 57 side. The convex portion 59B protrudes in the direction Z1. The shape of the convex portion 59B is a rectangle.
[0046] The unit substrate 53C is a plate-like portion extending from the center 57 in the direction Y1 when viewed from the direction Z1. In addition, when viewed from the direction Z1, the unit substrate 53C extends from the center 57 to the outer peripheral side of the antenna portion 41. The thickness direction of the unit substrate 53C is parallel to the direction X1 and the direction X2. The basic form of the unit substrate 53C is a rectangle. The unit substrate 53C has a convex portion 59C on the direction Z1 side and the center 57 side. The convex portion 59C protrudes in the direction Z1. The shape of the convex portion 59C is a rectangle.
[0047] The unit substrate 53D is a plate-like portion extending from the center 57 in the direction Y2 when viewed from the direction Z1. In addition, when viewed from the direction Z1, the unit substrate 53D extends from the center 57 to the outer peripheral side of the antenna portion 41. The thickness direction of the unit substrate 53D is parallel to the direction X1 and the direction X2. The basic form of the unit substrate 53D is a rectangle. The unit substrate 53D has a convex portion 59D on the direction Z1 side and the center 57 side. The convex portion 59D protrudes in the direction Z1. The shape of the convex portion 59D is a rectangle.
[0048] like Figures 4 to 7 As shown, when viewed from the direction Z1, the unit substrates 53A and 53B are arranged on a straight line passing through the center 57 and parallel to the directions X1 and X2. When viewed from the direction Z1, the unit substrates 53C and 53D are arranged on a straight line passing through the center 57 and parallel to the directions Y1 and Y2.
[0049] like Figures 4 to 8 As shown, the antenna radiating element 4 includes a bottom 55. The dielectric substrate 51 is connected to the bottom 55. The bottom 55 is a regular octagonal plate-shaped component. The size of the bottom 55 is equal to the size of the substrate 43. The bottom 55 is connected to the side surface on the Z2 side of the unit substrates 53A to 53D. The side surface refers to the surface located between one main surface and the main surface on the opposite side of the surface of the plate-shaped component. The thickness direction of the bottom 55 is parallel to the directions Z1 and Z2.
[0050] like Figure 6 , Figure 7 As shown, a continuous conductor pattern 61 is provided on the dielectric substrate 51. The conductor pattern 61 is a conductor pattern for signal transmission. The conductor pattern 61 reaches the surface of the protrusion 59D via the surface of the unit substrate 53C and the surface of the unit substrate 53D.
[0051] like Figure 5 , Figure 7 As shown in FIG. 1 , a continuous conductor pattern 63 is provided on the dielectric substrate 51. The conductor pattern 63 is a conductor pattern for signal transmission. The conductor pattern 63 reaches the surface of the protrusion 59B via the surface of the unit substrate 53A and the surface of the unit substrate 53B.
[0052] like Figure 5 , Figure 6 As shown in FIG. 1 , a continuous conductor pattern 83 is provided on the dielectric substrate 51. The conductor pattern 83 is a conductor pattern for GND. The conductor pattern 83 reaches the surface of the protrusion 59C via the surface of the unit substrate 53C.
[0053] like Figure 6 As shown in FIG. 1 , a continuous conductor pattern 85 is provided on the dielectric substrate 51. The conductor pattern 85 is a conductor pattern for GND. The conductor pattern 85 reaches the surface of the protrusion 59A via the surface of the unit substrate 53A.
[0054] The conductor pattern 61, the unit substrate 53C, and the conductor pattern 83 constitute a microstrip line. The conductor pattern 61 is a conductor pattern for signal transmission. The conductor pattern 83 is a conductor pattern for GND.
[0055] The conductor pattern 63, the unit substrate 53A, and the conductor pattern 85 constitute a microstrip line. The conductor pattern 63 is a conductor pattern for signal transmission. The conductor pattern 85 is a conductor pattern for GND.
[0056] The unit substrate 53B and the conductor pattern 63 function as a balanced-to-unbalanced converter. The unit substrate 53D and the conductor pattern 61 function as a balanced-to-unbalanced converter. The function of the balanced-to-unbalanced converter is to maintain the balance between the unbalanced circuit, i.e., the microstrip line, and the balanced circuit, i.e., the radiation elements 45A, 45B, 45C, 45D, and suppress the generation of common mode noise from the microstrip line.
[0057] like Figure 2 , Figure 3 as well as Figure 8 As shown, the protrusion 59A is inserted into the through hole 49A. The front end of the protrusion 59A is located on the Z1 side relative to the antenna part 41. A portion of the conductor pattern 85 formed on the protrusion 59A is located on the Z1 side relative to the antenna part 41. The portion of the conductor pattern 85 formed on the protrusion 59A is connected to the radiation element 45A by soldering.
[0058] like Figure 2 , Figure 3 as well as Figure 8 As shown, the protrusion 59B is inserted into the through hole 49B. The front end of the protrusion 59B is located on the Z1 side of the antenna part 41. A portion of the conductor pattern 63 formed on the protrusion 59B is located on the Z1 side of the antenna part 41. The portion of the conductor pattern 63 formed on the protrusion 59B is connected to the radiation element 45B by soldering.
[0059] like Figure 2 , Figure 3 as well as Figure 8 As shown, the protrusion 59C is inserted into the through hole 49C. The front end of the protrusion 59C is located on the Z1 side of the antenna unit 41. A portion of the conductor pattern 83 formed on the protrusion 59C is located on the Z1 side of the antenna unit 41. The portion of the conductor pattern 83 formed on the protrusion 59C is connected to the radiation element 45C by soldering.
[0060] like Figure 2 , Figure 3 as well as Figure 8 As shown, the protrusion 59D is inserted into the through hole 49D. The front end of the protrusion 59D is located on the Z1 side of the antenna part 41. A portion of the conductor pattern 61 formed on the protrusion 59D is located on the Z1 side of the antenna part 41. The portion of the conductor pattern 61 formed on the protrusion 59D is connected to the radiation element 45D by soldering.
[0061] like Figure 2 to Figure 7As shown, the antenna radiating element 4 includes a hollow cylindrical portion 97. The axial direction of the cylindrical portion 97 is parallel to the directions Z1 and Z2. The cross-sectional shape of the cylindrical portion 97 in the cross section perpendicular to the directions Z1 and Z2 is a regular octagon. Figure 3 The central axis 99 of the cylindrical portion 97 shown is parallel to the directions Z1 and Z2 and passes through the center 47. The central axis 99 is a straight line that passes through the center of the cylindrical portion 97 in a cross section perpendicular to the directions Z1 and Z2 and is parallel to the directions Z1 and Z2.
[0062] The cylindrical portion 97 has an opening 96 at the end on the direction Z1 side. The outside and the inside of the cylindrical portion 97 are connected via the opening 96. The size of the opening 96 is equal to the size of the hole inside the cylindrical portion 97. The end on the direction Z2 side of the cylindrical portion 97 is closed by the bottom 55. The cylindrical portion 97 and the bottom 55 constitute a reflector 98.
[0063] like Figure 2 As shown, the antenna portion 41 is located near the opening portion 96 and outside the reflector 98. The antenna portion 41 is located on the Z1 side relative to the opening portion 96. In the Z1 direction, there is a gap between the antenna portion 41 and the reflector 98. Fig.10 As shown, the distance between the end 97A of the cylindrical portion 97 on the Z1 side and the antenna portion 41 in the Z1 direction is set to L1. For example, L1 is preferably greater than λ / 6 and less than λ / 10. λ is a wavelength corresponding to the resonant frequency of the antenna radiating element 4. Fig.10 As shown in FIG. 1 , the distance between the bottom portion 55 and the antenna portion 41 in the direction Z1 is set to L2. L2 is preferably about λ / 4.
[0064] like Figure 2 , Figures 4 to 7 As shown, most of the dielectric substrate 51 is housed inside the cylindrical portion 97. The reflector 98 (that is, the cylindrical portion 97 and the bottom portion 55) is a member made of metal such as aluminum.
[0065] The high frequency signal received by the coaxial cable adapter 25a is transmitted to the radiating element 45D via the intermediate path (not shown) and the conductor pattern 61. The high frequency signal received by the coaxial cable adapter 25b is transmitted to the radiating element 45B via the intermediate path (not shown) and the conductor pattern 63.
[0066] The dielectric substrate 51 can be manufactured by injection molding, for example. For example, the conductor patterns 61, 63, 83, 85 can be formed according to MID (Molded Interconnected Device: molded interconnect device, molded circuit component) technology.
[0067] 3. Effects of the antenna radiating element 4
[0068] (1A) The antenna radiating element 4 can suppress variations in beam width by including the reflector 98. The effect of suppressing variations in beam width can be confirmed using simulation software (Femlet manufactured by Murata Software).
[0069] (1B) The shape of the reflector 98 in the cross section perpendicular to the direction Z1 is a regular octagon. Therefore, a plurality of antenna radiating elements 4 can be densely arranged. By densely arranging the antenna radiating elements 4, the antenna device 1 can be miniaturized. Fig. 9 , and explain its effect. Fig. 9 1 shows a state where a plurality of antenna radiating elements 4 are arranged in a staggered manner. In addition, a plurality of antenna radiating elements 4 may be arranged along a straight line as shown in FIG. 1 , or may be arranged in a staggered manner as shown in FIG. Fig. 9 Arrange as shown.
[0070] In a cross section perpendicular to the direction Z1, the distance between two opposing sides of the reflector 98 having a regular octagonal shape is represented by L. Each side of the reflector 98 having a regular octagonal shape is represented by 98A. Fig. 9 In the illustrated state, sides 98A of adjacent antenna radiating elements 4 face each other with a short distance therebetween.
[0071] Assuming that the shape of the reflector 98 in the cross section perpendicular to the direction Z1 is a square with a side length of L, the reflector 98 has a Fig. 9 The corner region 101 shown is repeatedly included on both sides of the reflector 98 of the adjacent antenna radiating elements 4. Therefore, the interval between the adjacent antenna radiating elements 4 must be smaller than Fig. 9 As a result, when the reflector 98 is in a square shape, the antenna radiating elements 4 cannot be arranged densely compared to when the reflector 98 is in a regular octagonal shape.
[0072] (1C) The shape of the reflector 98 in the cross section perpendicular to the direction Z1 is a regular octagon. The distance between the two opposite sides of the regular octagon is set to L. In this case, the cross-sectional area of the reflector 98 can be increased compared to the case where the shape of the cross section perpendicular to the direction Z1 of the reflector 98 is a circle with a diameter L. As a result, the deviation of the beam width can be further suppressed.
[0073] (1D) The shape of the reflector 98 in the cross section perpendicular to the direction Z1 is a regular octagon. Fig. 9As shown, by making the sides 98A of the regular octagon face each other between the plurality of antenna radiating elements 4, it is easy to regularly arrange the plurality of antenna radiating elements 4. In addition, when the shape of the cross section of the reflector 98 orthogonal to the direction Z1 is circular, it is difficult to regularly arrange the plurality of antenna radiating elements 4 because there is no side 98A that serves as a reference for the arrangement.
[0074] (1E) The central axis 99 of the cylindrical portion 97 passes through the intersection point (i.e., the center 47) of the bow-tie antenna 46 and the bow-tie antenna 48. In addition, the central axis 99 is orthogonal to the extension direction (i.e., the directions X1 and X2) of the bow-tie antenna 46. In addition, the central axis 99 is orthogonal to the extension direction (i.e., the directions Y1 and Y2) of the bow-tie antenna 48. Therefore, the effect of the reflector 98 is further improved, and the antenna radiating element 4 can further suppress the deviation of the beam width.
[0075] <Other Implementation Methods>
[0076] As mentioned above, although embodiment of this disclosure was described, this disclosure is not limited to the said embodiment, Various deformation|transformation can be made and it can be implemented.
[0077] (1) In the first embodiment, the reflector 98 may include a main body made of resin and a metal plating layer formed on the surface of the main body. In this case, the same effects as those of the first embodiment can be achieved.
[0078] (2) It is also possible to make multiple components share the functions of one component in each of the above embodiments, or to make one component play the functions of multiple components. In addition, it is also possible to omit a part of the structure of each of the above embodiments. In addition, it is also possible to add or replace at least a part of the structure of each of the above embodiments with respect to the structure of other embodiments.
[0079] (3) In addition to the above-described antenna radiating element 4 , the present disclosure can be implemented in various forms such as a system including the antenna radiating element 4 as a component and a method for manufacturing the antenna radiating element 4 .
[0080] [Technical ideas disclosed in this specification]
[0081] [Project 1]
[0082] An antenna radiating element comprises: an antenna portion including two bow-tie antennas arranged in a cross shape; and a reflector.
[0083] The reflector has:
[0084] The cylindrical portion has a cross-sectional shape of a cross section perpendicular to the axial direction that is a regular octagon;
[0085] a bottom portion closing one end portion of the cylindrical portion in the axial direction; and
[0086] an opening portion provided at an end portion of the cylindrical portion opposite to the one end portion,
[0087] The antenna portion is located near the opening portion.
[0088] [Project 2]
[0089] The radiating element for an antenna according to item 1, wherein:
[0090] The central axis of the cylindrical portion passes through the intersection of the two bow-tie antennas.
[0091] The central axis is orthogonal to the extension direction of the two bow-tie antennas.
[0092] [Item 3]
[0093] The radiating element for an antenna according to item 1 or 2, wherein:
[0094] The reflecting plate includes a main body portion formed of resin and a metal plating layer formed on a surface of the main body portion.
[0095] [Item 4] An antenna device comprising: the antenna radiating element according to any one of Items 1 to 3.
Claims
1. A radiating element for an antenna, characterized in that: The device comprises: an antenna unit including two bow-tie antennas arranged in a cross shape; and a reflector, The reflector has: The cylindrical portion has a cross-sectional shape of a cross section perpendicular to the axial direction that is a regular octagon; a bottom portion closing one end portion of the cylindrical portion in the axial direction; and an opening portion provided at an end portion of the cylindrical portion opposite to the one end portion, The antenna portion is located near the opening portion.
2. The antenna radiating element according to claim 1, characterized in that: The central axis of the cylindrical portion passes through the intersection of the two bow-tie antennas. The central axis is orthogonal to the extension direction of the two bow-tie antennas.
3. The antenna radiating element according to claim 1 or 2, characterized in that: The reflecting plate includes a main body portion formed of resin and a metal plating layer formed on a surface of the main body portion.
4. An antenna device, characterized in that: A radiating element for an antenna as claimed in claim 1 or 2.