Antenna device

Abstract

An antenna device is provided with a plurality of oscillators arranged substantially symmetrically, and a cutout is provided at the tip of at least one of the plurality of oscillators.

Description

Technical Field

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

[0002] In recent years, various wideband antennas have been developed. For example, Patent Document 1 describes an antenna having a triangular-shaped conductor. In this antenna, the voltage standing wave ratio (VSWR) is less than 2.5 at 95% of the frequency bands from 700 MHz to 960 MHz and from 1600 MHz to 2900 MHz.

[0003] Prior Art Documents

[0004] Patent Documents

[0005] Patent Document 1: U.S. Patent No. 10305162 Specification Summary of the Invention

[0006] There are cases where a wideband antenna has a plurality of oscillators arranged substantially symmetrically. In a wideband antenna, adjustment of the resonant frequency in a low frequency band and the like, and adjustment of the characteristics of a desired frequency band are sometimes required.

[0007] An example of the object of the present invention is to adjust the characteristics of a desired frequency band of a wideband antenna. Other objects of the present invention will become clear from the description of this specification.

[0008] One aspect of the present invention is an antenna device,

[0009] including a plurality of oscillators arranged substantially symmetrically,

[0010] and a notch is provided at the front end of at least one of the plurality of oscillators.

[0011] According to the above aspect of the present invention, it is possible to adjust the characteristics of a desired frequency band of a wideband antenna. Brief Description of the Drawings

[0012] Figure 1 is an exploded perspective view of the antenna device of the embodiment.

[0013] Figure 2 is a perspective view of the second grommet and its surroundings of the embodiment.

[0014] Figure 3 is a cross-sectional view perpendicular to the X direction of the base, the housing, the waterproof gasket, the second grommet, and the second cable of the antenna device of the embodiment.

[0015] Figure 4 is a cross-sectional view perpendicular to the Y direction of the base, the housing, the first grommet, and the first cable of the antenna device of the embodiment.

[0016] Figure 5Is a perspective view of the interior of the base of the antenna device of the embodiment.

[0017] Figure 6 Is a perspective view of the interior of the housing of the antenna device of the embodiment.

[0018] Figure 7 Is a perspective view of the antenna unit of the embodiment.

[0019] Figure 8 Is a graph showing the frequency characteristics of the voltage standing wave ratio (VSWR) of the first antenna of Example 1.1, Example 1.2, and Example 1.3 from 500 MHz to 5000 MHz.

[0020] Figure 9 Is a graph showing the frequency characteristics of the VSWR of the first antenna of Example 1.1, Example 1.2, and Example 1.3 from 500 MHz to 1000 MHz.

[0021] Figure 10 Is a graph showing the frequency characteristics of the VSWR of the second antenna of Example 1.1, Example 1.2, and Example 1.3 from 500 MHz to 5000 MHz.

[0022] Figure 11 Is a graph showing the frequency characteristics of the VSWR of the second antenna of Example 1.1, Example 1.2, and Example 1.3 from 500 MHz to 1000 MHz.

[0023] Figure 12 Is a perspective view of the antenna unit of Modification 1.

[0024] Figure 13 Is a perspective view of the antenna unit of the Comparative Example.

[0025] Figure 14 Is a graph showing the frequency characteristics of the VSWR of the first antenna of Modification 1.1 and the first antenna of Comparative Example 1.1 from 500 MHz to 5000 MHz.

[0026] Figure 15 Is a graph showing the frequency characteristics of the VSWR of the second antenna of Modification 1.1 and the second antenna of Comparative Example 1.1 from 500 MHz to 5000 MHz.

[0027] Figure 16 Is a perspective view of the antenna unit of Modification 2.

[0028] Figure 17 Is a graph showing the frequency characteristics of the VSWR of the first antenna of Modification 2.1 and the first antenna of Comparative Example 1.1 from 500 MHz to 5000 MHz.

[0029] Figure 18 It is a graph showing the frequency characteristics at 500 MHz to 5000 MHz of the VSWR of the second antenna of Modification 2.1 and the second antenna of Comparative Example 1.1. Detailed implementation mode

[0030] Hereinafter, embodiments and modifications of the present invention will be described with reference to the accompanying drawings. In all the drawings, the same reference numerals are assigned to the same structural elements, and the description will be appropriately omitted.

[0031] Figure 1 It is an exploded perspective view of the antenna device 10 of the embodiment. Figure 2 It is a perspective view of the second grommet 220 and its surroundings of the embodiment. Figure 3 It is a cross-sectional view perpendicular to the X direction of the base 110, the housing 120, the waterproof gasket 200, the second grommet 220, and the second cable 420 of the antenna device 10 of the embodiment. Figure 4 It is a cross-sectional view perpendicular to the Y direction of the base 110, the housing 120, the first grommet 210, and the first cable 410 of the antenna device 10 of the embodiment. Figure 5 It is a perspective view of the inside of the base 110 of the antenna device 10 of the embodiment. Figure 6 It is a perspective view of the inside of the housing 120 of the antenna device 10 of the embodiment.

[0032] For the purpose of explanation, the X-axis, Y-axis, and Z-axis representing the X-direction, Y-direction, and Z-direction are illustrated in each figure. The Z-direction is a direction parallel to the arrangement direction of the base 110 and the housing 120. The X-direction is one of the directions perpendicular to the Z-direction. The Y-direction is one of the directions perpendicular to the Z-direction and the X-direction. Hereinafter, as needed, the side indicated by the arrow of the X-axis is referred to as the +X side, and the opposite side of the side indicated by the arrow of the X-axis is referred to as the -X side. Hereinafter, as needed, the side indicated by the arrow of the Y-axis is referred to as the +Y side, and the opposite side of the side indicated by the arrow of the Y-axis is referred to as the -Y side. Hereinafter, as needed, the side indicated by the arrow of the Z-axis is referred to as the +Z side, and the opposite side of the side indicated by the arrow of the Z-axis is referred to as the -Z side. In some figures, the black dot in the white circle representing the X-axis, Y-axis, or Z-axis indicates that the arrow of the X-axis, Y-axis, or Z-axis points from the inside of the paper surface toward the front. In some figures, the white circle with a cross representing the X-axis, Y-axis, or Z-axis indicates that the arrow of the X-axis, Y-axis, or Z-axis points from the front of the paper surface toward the inside. In one example, the Z-direction is a direction parallel to the vertical direction, and the X-direction and the Y-direction are each a direction parallel to the horizontal direction perpendicular to the vertical direction. In this example, the X-direction, Y-direction, and Z-direction are, for example, the front-back direction, left-right direction, and up-down direction of the antenna device 10, respectively. However, the relationship between the X-direction, Y-direction, Z-direction, vertical direction, and horizontal direction may vary depending on the object on which the antenna device 10 is mounted. For example, depending on the object on which the antenna device 10 is mounted, there may be a case where the Z-direction is parallel to the horizontal direction.

[0033] Hereinafter, as needed, the plane perpendicular to the X-direction is referred to as the YZ plane, the plane perpendicular to the Y-direction is referred to as the ZX plane, the plane perpendicular to the Z-direction is referred to as the XY plane, and the direction perpendicular to the Z-direction is referred to as the XY plane direction.

[0034] Hereinafter, as needed, when observed from the +Z side or -Z side, the side between the +X side and the +Y side, the side between the -X side and the +Y side, the side between the -X side and the -Y side, and the side between the +X side and the -Y side are referred to as the +X+Y side, -X+Y side, -X-Y side, and +X-Y side, respectively. Hereinafter, as needed, when observed from the +X side or -X side, the side between the +Y side and the +Z side, the side between the -Y side and the +Z side, the side between the -Y side and the -Z side, and the side between the +Y side and the -Z side are referred to as the +Y+Z side, -Y+Z side, -Y-Z side, and +Y-Z side, respectively. Hereinafter, as needed, when observed from the +Y side or -Y side, the side between the +Z side and the +X side, the side between the -Z side and the +X side, the side between the -Z side and the -X side, and the side between the +Z side and the -X side are referred to as the +Z+X side, -Z+X side, -Z-X side, and +Z-X side, respectively.

[0035] Refer to Figure 1The antenna device 10 will be described.

[0036] The antenna device 10 includes a housing 100, a waterproof gasket 200, a first grommet 210, a second grommet 220, an antenna unit 300, a first cable 410, and a second cable 420. The antenna device 10 may also include a circuit board (not shown) housed in the housing 100 as needed. The housing 100 has a base 110 and a casing 120. The antenna unit 300 has a first antenna 300a and a second antenna 300b. The first antenna 300a includes a first substrate 302, a first oscillator 310, a second oscillator 320, a third oscillator 330, and a fourth oscillator 340. The second antenna 300b includes a second substrate 304, a fifth oscillator 350, a sixth oscillator 360, a seventh oscillator 370, and an eighth oscillator 380. A first ferrite core 412 is provided on the first cable 410. A second ferrite core 422 is provided on the second cable 420.

[0037] When viewed from the +Z side, the base 110 has a substantially square shape with a pair of sides extending substantially parallel to the X direction and another pair of sides extending substantially parallel to the Y direction. However, the shape of the base 110 is not limited to the shape of the embodiment.

[0038] When viewed from the +Z side, the casing 120 has substantially the same shape as the base 110. The casing 120 covers the space on the +Z side of the base 110. The base 110 and the casing 120 are mounted to each other by a plurality of screws 102. In the embodiment, when viewed from the +Z side, eight screws 102 are provided at eight locations at the four corners of the base 110 and at substantially the central portions of the respective sides of the base 110. However, the number of screws 102 and the positions where the screws 102 are provided are not limited to the example of the embodiment. By mounting the base 110 and the casing 120 to each other, the housing 100 is formed. The housing 100 defines a housing space for housing the antenna unit 300, the first ferrite core 412, and the second ferrite core 422.

[0039] A surrounding groove 112 is provided on the +Z side surface of the base 110. When viewed from the +Z side, the surrounding groove 112 surrounds the region where the antenna unit 300, the first ferrite core 412, and the second ferrite core 422 are disposed. When viewed from the +Z side, the surrounding groove 112 has a substantially square shape with a pair of sides extending substantially parallel to the X direction and another pair of sides extending substantially parallel to the Y direction. When viewed from the +Z side, at substantially the central portion of each side of the surrounding groove 112, there is a recessed portion that is recessed toward the central portion of the XY plane of the base 110. Through this recessed portion of the surrounding groove 112, a space is formed for mounting the screw 102 at substantially the central portion of each side of the base 110.

[0040] On the +Z side surface of the base 110, there are provided two columnar protrusions 114. The two columnar protrusions 114 are arranged substantially parallel to the Y direction. By each columnar protrusion 114, on the -Z side surface of the base 110, a recessed portion recessed toward the +Z side is defined. On the +Z side surface of the columnar protrusion 114 on the -Y side, there is provided a communication hole communicating with the accommodation space inside the housing 100. This communication hole is covered by a ventilation filter 116. Therefore, when the accommodation space inside the housing 100 becomes high temperature, the air in the accommodation space inside the housing 100 can be released to the outside through the communication hole and the ventilation filter 116, and deformation of the housing 100 can be prevented. The ventilation filter 116 inhibits foreign matters such as dust and moisture outside the housing 100 from entering the accommodation space inside the housing 100. Thus, the air inside the housing 100 can be released to the outside while maintaining the waterproof and dustproof properties inside the housing 100. On the columnar protrusion 114 on the +Y side, there is no communication hole communicating with the accommodation space inside the housing 100.

[0041] The columnar protrusion 114 on the +Y side may not be covered by the ventilation filter 116. In the case where neither of the two columnar protrusions 114 is covered by the ventilation filter 116, communication holes communicating with the accommodation space inside the housing 100 may not be provided in both of the two columnar protrusions 114. In this case, the accommodation space inside the housing 100 can be sealed.

[0042] The waterproof gasket 200 is an elastic material such as rubber. Through the waterproof gasket 200, waterproofing can be performed around the antenna portion 300, the first ferrite core 412, and the second ferrite core 422 in the housing 100. When viewed from the +Z side, the waterproof gasket 200 is buried in the surrounding groove 112. When viewed from the +Z side, the waterproof gasket 200, like the surrounding groove 112, has a substantially square shape with a pair of sides extending substantially parallel to the X direction and another pair of sides extending substantially parallel to the Y direction. When viewed from the +Z side, at substantially the central portion of each side of the waterproof gasket 200, similar to the substantially central portion of each side of the surrounding groove 112, there is provided a recessed portion recessed toward the central portion of the XY plane of the base 110.

[0043] The first grommet 210 is an elastic material such as rubber. Through the first grommet 210, waterproofing can be performed on the portion through which the first cable 410 passes in the housing 100. The first grommet 210 and the waterproof gasket 200 are integrated into one component. Figure 1In the example shown, the first grommet 210 is provided at a portion on the -Y side of the +X side edge of the waterproof gasket 200. Therefore, compared with the case where the waterproof gasket 200 and the first grommet 210 are separate components, the number of components for waterproofing the periphery of the antenna portion 300 in the housing 100 and the number of components for waterproofing the portion through which the first cable 410 passes in the housing 100 can be reduced.

[0044] The second grommet 220 is made of an elastic material such as rubber. Through the second grommet 220, the portion through which the second cable 420 passes in the housing 100 can be waterproofed. The second grommet 220 is a separate component from the waterproof gasket 200. Figure 1 In the example shown, the second grommet 220 overlaps with a portion on the +Y side of the +X side edge of the waterproof gasket 200 in the Z direction. Therefore, at least a part of the waterproof gasket 200 and at least a part of the second grommet 220 overlap with each other in the Z direction.

[0045] In the embodiment, the antenna portion 300 operates as a fifth-generation mobile communication system (5G) antenna. However, the antenna portion 300 can also be an antenna different from the 5G antenna. At least a part of the first antenna 300a and at least a part of the second antenna 300b overlap with each other in the Z direction. The first substrate 302 and the second substrate 304 are each, for example, a printed circuit board (PCB). The first oscillator 310, the second oscillator 320, the third oscillator 330, the fourth oscillator 340, the fifth oscillator 350, the sixth oscillator 360, the seventh oscillator 370, and the eighth oscillator 380 are each a conductor such as a metal plate. Each oscillator can also be printed on the substrate as a pattern. When viewed from the +Z side, the first oscillator 310, the second oscillator 320, the third oscillator 330, and the fourth oscillator 340 are respectively located on the +X+Y side, -X-Y side, +X-Y side, and -X+Y side with respect to the first substrate 302. When viewed from the +Z side, the fifth oscillator 350, the sixth oscillator 360, the seventh oscillator 370, and the eighth oscillator 380 are respectively located on the +X+Y side, -X-Y side, +X-Y side, and -X+Y side with respect to the second substrate 304.

[0046] The first cable 410 is a coaxial cable. One end of the first cable 410 is electrically connected to the first substrate 302 by, for example, soldering. In the embodiment, at least a part of this one end of the first cable 410 is located between the +Z side surface of the base 110 and the -Z side surface of the first substrate 302 in the Z direction. The other end of the first cable 410 is led out to the +X side of the housing 100 through the first grommet 210.

[0047] The first ferrite core 412 is provided to suppress the noise current flowing in the first cable 410. The first ferrite core 412 is provided on the -X side of the first grommet 210. The first ferrite core 412 is mounted on the base 110. When viewed from the +Z side, the first ferrite core 412 is arranged substantially parallel to the X direction. When viewed from the +Y side or the -Y side, the first ferrite core 412 is arranged substantially parallel to the X direction. However, when viewed from the +Y side or the -Y side, the first ferrite core 412 may be inclined with respect to the X direction.

[0048] The second cable 420 is a coaxial cable. One end of the second cable 420 is electrically connected to the second substrate 304 by, for example, soldering. In the embodiment, at least a part of this one end of the second cable 420 is located between the -Z side surface of the housing 120 and the +Z side surface of the second substrate 304 in the Z direction. The other end of the second cable 420 is led out to the +X side of the housing 100 through the second grommet 220.

[0049] The second ferrite core 422 is provided to suppress the noise current flowing in the second cable 420. The second ferrite core 422 is provided on the -X side of the second grommet 220. The second ferrite core 422 is mounted on the housing 120. When viewed from the -Z side, the second ferrite core 422 is arranged substantially parallel to the Y direction. When viewed from the +X side or the -X side, the second ferrite core 422 is inclined with respect to the Y direction. However, when viewed from the +X side or the -X side, the second ferrite core 422 may be arranged substantially parallel to the Y direction.

[0050] Next, with reference to Figures 2 to 4 and, if necessary, with reference to Figure 5 and Figure 6 will be described. In the second cable 420 shown in Figure 3 , the entire second cable 420 including the core wire, the braid, etc. of the second cable 420 is shown as a solid cable and shaded. The same applies to the first cable 410 shown in Figure 4 .

[0051] As shown in Figure 3 , Figure 4 and Figure 6 , the housing 120 has a pressing rib 122. The pressing rib 122 projects from the housing 120 toward the -Z side. As shown in Figure 6 , when viewed from the -Z side, the pressing rib 122 surrounds the area where the antenna unit 300, the first ferrite core 412, and the second ferrite core 422 are arranged.

[0052] As shown in Figure 4As shown, the first grommet 210 has a first base end portion 212, a first protruding portion 214, and a first connecting portion 216. The first grommet 210 is connected to the waterproof gasket 200 at the first base end portion 212. The first protruding portion 214 protrudes toward the +X side from the +X side surface of the base 110 and the housing 120. The first connecting portion 216 is disposed between the first base end portion 212 and the first protruding portion 214 in the X direction. The first base end portion 212 and the first protruding portion 214 communicate with each other via the first connecting portion 216.

[0053] As Figure 2 and Figure 3 shown, the second grommet 220 has a second base end portion 222, a second protruding portion 224, and a second connecting portion 226. As Figure 2 shown, at least a part of the second base end portion 222 and at least a part of the waterproof gasket 200 overlap and contact each other in the Z direction. Thus, compared with the case where the second base end portion 222 is offset toward the +X side or the -X side compared to the +X side edge of the waterproof gasket 200, the dimensions of the waterproof gasket 200 and the second grommet 220 in the X direction can be reduced. The second protruding portion 224 protrudes toward the +X side from the +X side surface of the base 110 and the housing 120. The second connecting portion 226 is disposed between the second base end portion 222 and the second protruding portion 224 in the X direction. The second base end portion 222 and the second protruding portion 224 are connected to each other via the second connecting portion 226. As Figure 2 shown, a fixing groove 226a is provided on the +Z side surface of the second connecting portion 226. When viewed from the +Z side, the fixing groove 226a is divided into a substantially + shape by four elastic ribs such as rubber provided on the +Z side surface of the second connecting portion 226.

[0054] In Figure 3 , the positions of the front end 122a of the pressing rib 122, the pressed surface 200a of the waterproof gasket 200, the first surface 222a of the second base end portion 222, and the second surface 222b of the second base end portion 222 are depicted by lines. The front end 122a is the -Z side end of the pressing rib 122. The pressed surface 200a is the +Z side surface of the waterproof gasket 200. In Figure 3 , the position of the pressed surface 200a depicted by lines shows the position of the pressed surface 200a of the waterproof gasket 200 in a state where the waterproof gasket 200 is not pressed by the pressing rib 122. The first surface 222a is the +Z side surface of the second base end portion 222. In Figure 3 , the position of the first surface 222a depicted by lines shows the position of the first surface 222a of the second base end portion 222 in a state where the second base end portion 222 is not pressed by the pressing rib 122. The second surface 222b is the -Z side surface of the second base end portion 222. As Figure 3 and Figure 5As shown, the pressed surface 200a of the waterproof gasket 200 defines a recess 202. The recess 202 overlaps and contacts the second base end portion 222 in the Z direction. As Figure 2 and Figure 3 shown, when viewed from the X direction, the first surface 222a of the second grommet 220 is curved. Specifically, when viewed from the X direction, the substantially central portion of the first surface 222a in the Y direction protrudes toward the +Z side, and both end portions of the first surface 222a in the Y direction protrude toward the -Z side. As Figure 3 shown, when viewed from the X direction, the second surface 222b of the second base end portion 222 is curved. Specifically, when viewed from the X direction, the substantially central portion of the second surface 222b in the Y direction protrudes toward the -Z side, and both end portions of the second surface 222b in the Y direction protrude toward the +Z side.

[0055] As Figure 3 and Figure 4 shown, in a state where the base 110 and the housing 120 are mounted to each other, the pressing rib 122 presses the pressed surface 200a of the waterproof gasket 200 toward the -Z side. Thereby, it is possible to waterproof the area surrounded by the waterproof gasket 200 when viewed from the Z direction.

[0056] As Figure 3 shown, in a state where the base 110 and the housing 120 are mounted to each other, the pressing rib 122 presses the first surface 222a of the second base end portion 222 toward the -Z side. In this state, the pressed surface 200a in the recess 202 of the waterproof gasket 200 and the second surface 222b of the second base end portion 222 are in contact with each other. Thereby, it is possible to suppress water from intruding into the interface between the pressed surface 200a in the recess 202 of the waterproof gasket 200 and the second surface 222b of the second base end portion 222.

[0057] As Figure 3 shown, in a state where the pressed surface 200a and the first surface 222a are pressed toward the -Z side by the pressing rib 122, the position of the portion of the pressed surface 200a pressed by the pressing rib 122 and the position of the portion of the first surface 222a pressed by the pressing rib 122 are the same as Figure 3The position of the front end 122a depicted by a line is the same. Therefore, in the portion of the pressed surface 200a of the waterproof gasket 200 pressed by the pressed rib 122 and the portion of the first surface 222a of the waterproof gasket 200 pressed by the pressed rib 122, both side portions of the second base end portion 222 in the Y direction on the pressed surface 200a of the waterproof gasket 200 and the first surface 222a of the second base end portion 222 are substantially flush along the front end 122a. As a result, compared with the case where there is a step difference in the Z direction between both side portions of the second base end portion 222 in the Y direction on the pressed surface 200a of the waterproof gasket 200 and the first surface 222a of the second base end portion 222, intrusion of water into the interface between the pressed surface 200a of the waterproof gasket 200 and the second surface 222b of the second base end portion 222 can be suppressed. In particular, in Figure 3 In the example shown above, as described above, when viewed from the X direction, both side portions of the first surface 222a of the second base end portion 222 in the Y direction are curves protruding toward the -Z side. Thus, compared with the case where both side portions of the first surface 222a of the second base end portion 222 in the Y direction protrude toward the +Z side when viewed from the X direction, it is easier to make both side portions of the second base end portion 222 in the Y direction on the pressed surface 200a of the waterproof gasket 200 and the first surface 222a of the second base end portion 222 substantially flush. However, there may be a step difference in the Z direction between both side portions of the second base end portion 222 in the Y direction on the pressed surface 200a of the waterproof gasket 200 and the first surface 222a of the second base end portion 222.

[0058] As Figure 3 and Figure 5 shown, at least a part of the second base end portion 222 is buried in the recess 202. In Figure 3 and Figure 5 In the example shown, the shape of the recess 202 is substantially the same as the shape of the second surface 222b of the second base end portion 222. Thus, compared with the case where the shape of the recess 202 is not the same as the shape of the second surface 222b of the second base end portion 222, it is easier to bury at least a part of the second base end portion 222 in the recess 202. When at least a part of the second base end portion 222 is buried in the recess 202, compared with the case where the second base end portion 222 is not buried in the recess 202, the total height of the waterproof gasket 200 and the second base end portion 222 in the Z direction can be reduced. In addition, when at least a part of the second base end portion 222 is buried in the recess 202, compared with the case where the second base end portion 222 is not buried in the recess 202, it is easier to make the pressed surface 200a of the waterproof gasket 200 and the first surface 222a of the second base end portion 222 substantially flush with the pressed surface 200a of the waterproof gasket 200.

[0059] As Figure 4As shown, a plurality of waterproof ribs 210a are provided on the inner peripheral surfaces of the first protruding portion 214 and the first communication portion 216. The plurality of waterproof ribs 210a are arranged substantially parallel to the X direction. When viewed from the X direction, each waterproof rib 210a has a substantially regular circular ring shape. Each waterproof rib 210a is made of an elastic material such as rubber. When viewed from the X direction, the diameter of the area surrounded by the waterproof ribs 210a is smaller than the diameter of the first cable 410. Thus, each waterproof rib 210a can press the outer peripheral surface of the first cable 410. Therefore, it is possible to make it difficult for water to penetrate between the inner peripheral surface of the first grommet 210 and the outer peripheral surface of the first cable 410.

[0060] As Figure 4 shown, the waterproof ribs 210a are not provided on the inner peripheral surface of the first base end portion 212. That is, the waterproof ribs 210a are provided on a portion of the first grommet 210 that is different from the portion pressed by the pressing rib 122. Assuming that the waterproof ribs 210a are provided on the inner peripheral surface of the first base end portion 212, when viewed from the X direction, there is also a case where the waterproof ribs 210a are deformed into an elliptical ring shape due to the pressing of the pressing rib 122. In this case, it may be difficult to sufficiently ensure the waterproofness of the waterproof ribs 210a. In contrast, in Figure 4 the example shown, it is possible to prevent any of the waterproof ribs 210a from being pressed by the waterproof ribs 210a. Thus, it is possible to prevent any of the waterproof ribs 210a from being deformed into an elliptical ring shape when viewed from the X direction.

[0061] Next, with reference to Figure 5 and Figure 6 , an example of the assembling method of the antenna device 10 of the embodiment will be described. In this example, the antenna device 10 of the embodiment is assembled as follows.

[0062] First, prepare the base 110 and the housing 120.

[0063] Next, as Figure 5 shown, install the waterproof gasket 200, the first grommet 210, the first antenna 300a, the first cable 410, and the first ferrite core 412 on the base 110. Figure 5 An example of the installation shown is as follows. Hereinafter, in Figure 5 the description of an example of the installation shown, the inner lead-out portion of the first cable 410 refers to the portion of the first cable 410 that is led out from the first grommet 210 to the inside of the base 110.

[0064] First, pass the first cable 410 through the first grommet 210 and the first ferrite core 412. Thus, the waterproof gasket 200, the first grommet 210, and the first cable 410 are temporarily assembled together. The length of the inner lead-out portion of the first cable 410 in the state where the waterproof gasket 200, the first grommet 210, and the first cable 410 are temporarily assembled together is longer than the length of the inner lead-out portion of the first cable 410 in the state where the antenna device 10 is finally assembled. That is, in the state where the waterproof gasket 200, the first grommet 210, and the first cable 410 are temporarily assembled together, the inner lead-out portion of the first cable 410 has an extra-length portion. Next, one end of the inner lead-out portion of the first substrate 302 and the first cable 410 is electrically connected to each other by soldering.

[0065] Next, assemble the base 110, the first oscillator 310, the second oscillator 320, the third oscillator 330, and the fourth oscillator 340 with each other.

[0066] Next, assemble the base 110 and the first substrate 302 with each other. Next, the four corner portions of the first substrate 302 are electrically connected to the base ends of the first oscillator 310, the second oscillator 320, the third oscillator 330, and the fourth oscillator 340 respectively by soldering. In the embodiment, at least a part of one end of the inner lead-out portion of the first cable 410 is in the Z direction and is located between the +Z side surface of the base 110 and the -Z side surface of the first substrate 302.

[0067] Next, while arranging the first cable 410, assemble the base 110 and the first ferrite core 412 with each other.

[0068] Next, while leading out the extra-length portion of the inner lead-out portion of the first cable 410 toward the +X side of the first grommet 210, assemble the base 110, the waterproof gasket 200, and the first grommet 210 with each other. Thus, in the method of this example, compared with the case where the first cable 410 is passed through the first grommet 210 after the base 110, the waterproof gasket 200, and the first grommet 210 are assembled together, the workability for passing the first cable 410 through the first grommet 210 can be improved.

[0069] Implement in this way Figure 5 the installation shown. However, Figure 5 the installation sequence shown is not limited to the above example.

[0070] Simultaneously with or before and after Figure 5 the installation shown, as Figure 6 shown, install the second grommet 220, the second antenna 300b, the second cable 420, and the second ferrite core 422 on the housing 120. Figure 6 An example of the installation shown is as follows. Hereinafter, inFigure 6 In the description of an example of the installation shown, the inner lead-out portion of the second cable 420 refers to the portion of the second cable 420 that is led out from the second grommet 220 toward the inside of the housing 120.

[0071] First, pass the second cable 420 through the second grommet 220 and the second ferrite core 422. Thus, the second grommet 220 and the second cable 420 are temporarily assembled together. The length of the inner lead-out portion of the second cable 420 in the state where the second grommet 220 and the second cable 420 are temporarily assembled together is longer than the length of the inner lead-out portion of the second cable 420 in the state where the antenna device 10 is finally assembled. That is, in the state where the second grommet 220 and the second cable 420 are temporarily assembled together, the inner lead-out portion of the second cable 420 has a surplus length portion. Next, electrically connect one end of the inner lead-out portion of the second substrate 304 and the second cable 420 to each other by soldering.

[0072] Next, assemble the housing 120, the fifth oscillator 350, the sixth oscillator 360, the seventh oscillator 370, and the eighth oscillator 380 to each other.

[0073] Next, assemble the housing 120 and the second substrate 304 to each other. Next, electrically connect each of the four corner portions of the second substrate 304 to the base end portions of the fifth oscillator 350, the sixth oscillator 360, the seventh oscillator 370, and the eighth oscillator 380 to each other by soldering. In the embodiment, at least a part of one end of the inner lead-out portion of the second cable 420 is in the Z direction and is located between the -Z side surface of the housing 120 and the +Z side surface of the second substrate 304.

[0074] Next, while arranging the second cable 420, assemble the housing 120 and the second ferrite core 422 to each other.

[0075] Next, while leading out the surplus length portion of the inner lead-out portion of the second cable 420 toward the +X side of the second grommet 220, assemble the housing 120 and the second grommet 220 to each other. Thus, in the method of this example, compared with the case where the second cable 420 is passed through the second grommet 220 after the housing 120 and the second grommet 220 are assembled together, the workability for passing the second cable 420 through the second grommet 220 can be improved.

[0076] Such as using Figure 2As described, on the +Z side surface of the second connecting portion 226 of the second cable loop 220, a fixing groove 226a is provided. In the housing 120, a substantially +-shaped rib (not shown) that is press-fitted into the fixing groove 226a is provided. By press-fitting the rib of the housing 120 into the fixing groove 226a, rotation of the second cable loop 220 around the axis of the second cable 420 can be suppressed. For example, even when the second cable 420 twists in the case where the surplus length portion of the inner lead-out portion of the second cable 420 is led out toward the +X side of the second cable loop 220, rotation of the second cable loop 220 can be suppressed.

[0077] Implement as such Figure 6 the installation shown. However, Figure 6 the installation sequence shown is not limited to the above example.

[0078] In Figure 5 the installation shown and Figure 6 after the installation shown, the base 110 and the housing 120 are mutually installed by Figure 1 the plurality of screws 102 shown. In this way, the antenna device 10 is assembled.

[0079] In the embodiment, the waterproof gasket 200 and the second cable loop 220 are separate components from each other. Thereby, the installation of the waterproof gasket 200 to the base 110 and the installation of the second cable loop 220 to the housing 120 can be implemented independently of each other. For example, assuming that the waterproof gasket 200 and the second cable loop 220 are integrated, in the state where the second antenna 300b is installed in the housing 120, it is relatively difficult to independently implement the operation of electrically connecting the second substrate 304 and the second cable 420 and the operation of leading out the second cable 420 from the second cable loop 220. Therefore, in the embodiment, compared with the case where the waterproof gasket 200 and the second cable loop 220 are integrated, the assemblability of the antenna device 10 can be improved. In addition, as described above, in the embodiment, compared with the case where the waterproof gasket 200 and the second cable loop 220 do not overlap and contact each other in the Z direction, the size of the antenna device 10 in the X direction can be reduced. Therefore, compared with the case where the waterproof gasket 200 and the second cable loop 220 are integrated and the case where the waterproof gasket 200 and the second cable loop 220 do not overlap and contact each other in the Z direction, while ensuring the waterproofness of the antenna device 10, improvement of the assemblability of the antenna device 10 and reduction of the size of the antenna device 10 can be achieved simultaneously.

[0080] In the embodiment, the waterproof gasket 200 and the first cable loop 210 are integrated with each other. However, the first cable loop 210 may also be a separate component from the waterproof gasket 200, similarly to the second cable loop 220. In this case, at least a part of the waterproof gasket 200 and at least a part of the first cable loop 210 may overlap and contact each other in the Z direction.

[0081] Next, an example of the usage method of the antenna device 10 will be described.

[0082] The antenna device 10 is used outdoors, for example. However, the antenna device 10 can also be used indoors. When the antenna device 10 is used outdoors, the antenna device 10 may be exposed to moisture such as rain and snow. However, in the antenna device 10, waterproofing is achieved based on the waterproof gasket 200, the first grommet 210, and the second grommet 220. Therefore, even if the antenna device 10 is exposed to moisture such as rain and snow, it will not hinder the operation of the antenna device 10. The antenna device 10 is mounted on a vehicle, for example. Alternatively, the antenna device 10 is provided in a vending machine installed outdoors, a ticket vending machine installed in an outdoor coin-operated parking lot, etc. When the antenna device 10 is provided on the outer shell of a vending machine, a ticket vending machine, etc., the antenna device 10 can be provided on the outside of the outer shell instead of inside the outer shell. However, the uses of the antenna device 10 are not limited to these examples.

[0083] Figure 7 It is a perspective view of the antenna unit 300 of the embodiment.

[0084] The antenna unit 300 can operate as a loop antenna in the low frequency band. The antenna unit 300 can operate as a dipole antenna in the medium frequency band. The antenna unit 300 can operate as a traveling wave antenna in the high frequency band. Thereby, the antenna unit 300 can operate as a wideband antenna.

[0085] When viewed from the +Z side, the first substrate 302 has a substantially rectangular shape with a pair of short sides substantially parallel to the X direction and a pair of long sides substantially parallel to the Y direction. When viewed from the +Z side, the second substrate 304 has a substantially rectangular shape with a pair of long sides substantially parallel to the X direction and a pair of short sides substantially parallel to the Y direction. The second substrate 304 is disposed on the +Z side of the first substrate 302. When viewed from the +Z side, the center point of the first substrate 302 in the XY plane direction and the center point of the second substrate 304 in the XY plane direction overlap each other in the Z direction. In Figure 7 for the sake of explanation, a first imaginary line L1 and a second imaginary line L2 are drawn. When viewed from the +Z side, the first imaginary line L1 passes through the center points of the first substrate 302 and the second substrate 304 in the XY plane direction substantially parallel to the X direction. When viewed from the +Z side, the second imaginary line L2 passes through the center points of the first substrate 302 and the second substrate 304 in the XY plane direction substantially parallel to the Y direction.

[0086] The first oscillator 310, the second oscillator 320, the third oscillator 330, and the fourth oscillator 340 will be described.

[0087] The first oscillator 310 includes a first arm portion 312, a first side portion 314, and a first extension portion 316. A first notch 318 is provided at the front end portion of the first side portion 314. The second oscillator 320 includes a second arm portion 322, a second side portion 324, and a second extension portion 326. A second notch 328 is provided at the front end portion of the second side portion 324. The third oscillator 330 includes a third arm portion 332, a third side portion 334, and a third extension portion 336. A third notch 338 is provided at the front end portion of the third side portion 334. The fourth oscillator 340 includes a fourth arm portion 342, a fourth side portion 344, and a fourth extension portion 346. A fourth notch 348 is provided at the front end portion of the fourth side portion 344. The first cable 410 can be led out from the first substrate 302 by passing through at least one of the first notch 318, the second notch 328, the third notch 338, and the fourth notch 348.

[0088] When viewed from the +Z side, the first oscillator 310, the second oscillator 320, the third oscillator 330, and the fourth oscillator 340 are arranged substantially symmetrically with respect to the center point in the XY plane direction of the first substrate 302. Specifically, when viewed from the +Z side, the pair of the first oscillator 310 and the fourth oscillator 340 and the pair of the second oscillator 320 and the third oscillator 330 are arranged substantially symmetrically with respect to the first imaginary line L1. When viewed from the +Z side, the pair of the first oscillator 310 and the third oscillator 330 and the pair of the second oscillator 320 and the fourth oscillator 340 are arranged substantially symmetrically with respect to the second imaginary line L2. Thus, when viewed from the +Z side, the first oscillator 310, the second oscillator 320, the third oscillator 330, and the fourth oscillator 340 have substantially the same shape.

[0089] The second oscillator 320 will be described. Unless otherwise specified, the matters described below for the second oscillator 320 are the same for the first oscillator 310, the third oscillator 330, and the fourth oscillator 340 except for the aspect that the first oscillator 310, the third oscillator 330, and the fourth oscillator 340 are arranged substantially symmetrically with respect to the second oscillator 320.

[0090] The second arm portion 322 includes a base end portion electrically connected to the -X - Y side corner of the first substrate 302. The base end portion of the second arm portion 322 and the -X - Y side corner of the first substrate 302 are electrically connected to each other, for example, by solder bonding. The second arm portion 322 extends from the -X - Y side corner of the first substrate 302 toward the -X - Y side. The second side portion 324 and the second extension portion 326 extend from the second arm portion 322 toward the -X side. The second side portion 324 is bent toward the -X side with respect to the second arm portion 322. The second side portion 324 is arranged substantially parallel to the ZX plane. The second extension portion 326 is bent at a substantially right angle toward the +Y side with respect to the second side portion 324. The second extension portion 326 is arranged substantially parallel to the XY plane.

[0091] The width of the second oscillator 320 increases as it moves away from the base end portion of the second oscillator 320. Specifically, the width of the second arm portion 322 gradually increases as it moves away from the base end portion of the second oscillator 320. In a state where the second arm portion 322, the second side portion 324, and the second extension portion 326 are unfolded in substantially the same plane, the total width of the second arm portion 322, the second side portion 324, and the second extension portion 326 gradually increases from the second arm portion 322 toward the second side portion 324 and the second extension portion 326. Specifically, when viewed from the -Y side, the width of the second side portion 324 in the Z direction gradually increases from the second arm portion 322 toward the second side portion 324. The shape of the second extension portion 326 is substantially symmetric with respect to the center point of the first substrate 302 in the XY plane direction and the shape of the first extension portion 316. Thus, when viewed from the +Z side, the second extension portion 326 has a substantially trapezoidal shape with a broken line of the second side portion 324 and the second extension portion 326 as the lower base. Therefore, when viewed from the +Z side, the width of the second extension portion 326 in the Y direction gradually increases from the second arm portion 322 toward the second extension portion 326.

[0092] When viewed from the -Y side, the second notch 328 is provided at the +Z-X side corner of the front end portion of the second side portion 324. The width of the second notch 328 in the Z direction can take any length within a range not exceeding the maximum width of the second side portion 324 in the Z direction. According to the length of the second notch 328 in the X direction, the resonance frequency in the low frequency band near the 600 MHz frequency band of the first antenna 300a can be arbitrarily adjusted. Specifically, the longer the length of the second notch 328 in the X direction, the smaller the area of the second oscillator 320. Thus, the longer the length of the second notch 328 in the X direction, the shorter the wavelength of the resonance frequency of the first antenna 300a according to the area of the second oscillator 320. Therefore, the longer the length of the second notch 328 in the X direction, the higher the resonance frequency of the first antenna 300a. In contrast, the shorter the length of the second notch 328 in the X direction, the larger the area of the second oscillator 320. Thus, the shorter the length of the second notch 328 in the X direction, the longer the wavelength of the resonance frequency of the first antenna 300a according to the area of the second oscillator 320. Therefore, the shorter the length of the second notch 328 in the X direction, the lower the resonance frequency of the first antenna 300a.

[0093] The fifth oscillator 350, the sixth oscillator 360, the seventh oscillator 370, and the eighth oscillator 380 will be described.

[0094] The fifth oscillator 350 includes a fifth arm portion 352, a fifth side portion 354, and a fifth extension portion 356. A fifth notch 358 is provided at the front end portion of the fifth side portion 354. The sixth oscillator 360 includes a sixth arm portion 362, a sixth side portion 364, and a sixth extension portion 366. A sixth notch 368 is provided at the front end portion of the sixth side portion 364. The seventh oscillator 370 includes a seventh arm portion 372, a seventh side portion 374, and a seventh extension portion 376. A seventh notch 378 is provided at the front end portion of the seventh side portion 374. The eighth oscillator 380 includes an eighth arm portion 382, an eighth side portion 384, and an eighth extension portion 386. An eighth notch 388 is provided at the front end portion of the eighth side portion 384. The second cable 420 can be led out through at least one of the fifth notch 358, the sixth notch 368, the seventh notch 378, and the eighth notch 388 from the second substrate 304. For example, in Figure 1 the example shown, the first cable 410 is led out from the first substrate 302 through the seventh notch 378, and the second cable 420 is led out from the second substrate 304 through the fifth notch 358.

[0095] When viewed from the +Z side, the fifth oscillator 350, the sixth oscillator 360, the seventh oscillator 370, and the eighth oscillator 380 are arranged substantially symmetrically with respect to the center point in the XY plane direction of the second substrate 304. Specifically, when viewed from the +Z side, the pair of the fifth oscillator 350 and the eighth oscillator 380 and the pair of the sixth oscillator 360 and the seventh oscillator 370 are arranged substantially symmetrically with respect to the first imaginary line L1. When viewed from the +Z side, the pair of the fifth oscillator 350 and the seventh oscillator 370 and the pair of the sixth oscillator 360 and the eighth oscillator 380 are arranged substantially symmetrically with respect to the second imaginary line L2. Thus, when viewed from the +Z side, the fifth oscillator 350, the sixth oscillator 360, the seventh oscillator 370, and the eighth oscillator 380 have substantially the same shape.

[0096] The sixth oscillator 360 will be described. Unless otherwise specified, the matters described below for the sixth oscillator 360 are the same for the fifth oscillator 350, the seventh oscillator 370, and the eighth oscillator 380 except for the aspect that the fifth oscillator 350, the seventh oscillator 370, and the eighth oscillator 380 are arranged substantially symmetrically with respect to the fifth oscillator 350.

[0097] The sixth arm portion 362 includes a base end portion electrically connected to a corner on the -X-Y side of the second substrate 304. The base end portion of the sixth arm portion 362 and the corner on the -X-Y side of the second substrate 304 are electrically connected to each other, for example, by solder bonding. The sixth arm portion 362 extends from the corner on the -X-Y side of the second substrate 304 toward the -X-Y side. The sixth side portion 364 and the sixth extension portion 366 extend from the sixth arm portion 362 toward the -Y side. The sixth side portion 364 is bent toward the -Y side with respect to the sixth arm portion 362. The sixth side portion 364 is disposed substantially parallel to the YZ plane. The sixth extension portion 366 is bent at a substantially right angle toward the +X side with respect to the sixth side portion 364. The sixth extension portion 366 is disposed substantially parallel to the XY plane. At least a part of the second extension portion 326 and at least a part of the sixth extension portion 366 face each other in the Z direction.

[0098] The width of the sixth oscillator 360 increases as it moves away from the base end portion of the sixth oscillator 360. Specifically, the width of the sixth arm portion 362 gradually increases as it moves away from the base end portion of the sixth oscillator 360. In a state where the sixth arm portion 362, the sixth side portion 364, and the sixth extension portion 366 are unfolded in substantially the same plane, the total width of the sixth arm portion 362, the sixth side portion 364, and the sixth extension portion 366 gradually increases from the sixth arm portion 362 toward the sixth side portion 364 and the sixth extension portion 366. Specifically, when viewed from the -X side, the width of the sixth side portion 364 in the Z direction gradually increases from the sixth arm portion 362 toward the sixth side portion 364. When viewed from the +Z side, the sixth extension portion 366 has a substantially trapezoidal shape with the broken line of the sixth side portion 364 and the sixth extension portion 366 as the lower base. Therefore, when viewed from the +Z side, the width of the sixth extension portion 366 in the X direction gradually increases from the sixth arm portion 362 toward the sixth extension portion 366.

[0099] When viewed from the -X side, the sixth cutout 368 is provided at the -Y-Z side corner of the front end portion of the sixth side portion 364. The width of the sixth cutout 368 in the Z direction can take any length within a range not exceeding the maximum width of the sixth side portion 364 in the Z direction. According to the length of the sixth cutout 368 in the Y direction, the resonance frequency in the low frequency band near the 600 MHz band of the second antenna 300b can be adjusted. Specifically, the longer the length of the sixth cutout 368 in the Y direction, the smaller the area of the sixth oscillator 360. Thus, the longer the length of the sixth cutout 368 in the Y direction, the shorter the wavelength of the resonance frequency of the second antenna 300b according to the area of the sixth oscillator 360. Therefore, the longer the length of the sixth cutout 368 in the Y direction, the higher the resonance frequency of the second antenna 300b. On the contrary, the shorter the length of the sixth cutout 368 in the Y direction, the larger the area of the sixth oscillator 360. Thus, the shorter the length of the sixth cutout 368 in the Y direction, the longer the wavelength of the resonance frequency of the second antenna 300b according to the area of the sixth oscillator 360. Therefore, the shorter the length of the sixth cutout 368 in the Y direction, the lower the resonance frequency of the second antenna 300b.

[0100] Figure 8 It is a graph showing the frequency characteristics of the voltage standing wave ratio (VSWR) of the first antenna 300a of Example 1.1, Example 1.2, and Example 1.3 in the range of 500 MHz to 5000 MHz. Figure 9 It is a graph showing the frequency characteristics of the VSWR of the first antenna 300a of Example 1.1, Example 1.2, and Example 1.3 in the range of 500 MHz to 1000 MHz. Figure 10 It is a graph showing the frequency characteristics of the VSWR of the second antenna 300b of Example 1.1, Example 1.2, and Example 1.3 in the range of 500 MHz to 5000 MHz. Figure 11 It is a graph showing the frequency characteristics of the VSWR of the second antenna 300b of Example 1.1, Example 1.2, and Example 1.3 in the range of 500 MHz to 1000 MHz.

[0101] Figures 8 to 11 The horizontal axis of each graph is frequency (unit: MHz). Figures 8 to 11 The vertical axis of each graph is VSWR.

[0102] Antenna unit 300 of Example 1.1, Example 1.2, and Example 1.3 is an example of the antenna unit 300 of the embodiment. The lengths in the X direction of the cuts provided at the front ends of the first oscillator 310, the second oscillator 320, the third oscillator 330, and the fourth oscillator 340 become shorter in the order of Example 1.1, Example 1.2, and Example 1.3. The lengths in the Y direction of the cuts provided at the front ends of the fifth oscillator 350, the sixth oscillator 360, the seventh oscillator 370, and the eighth oscillator 380 become shorter in the order of Example 1.1, Example 1.2, and Example 1.3.

[0103] As Figures 8 to 11 shown, in either the first antenna 300a or the second antenna 300b, the VSWR takes a minimum value near the 600 MHz band. In either the first antenna 300a or the second antenna 300b, the resonance frequencies at which the VSWR takes the minimum value become lower in the order of Example 1.1, Example 1.2, and Example 1.3. As a result, it is revealed that the longer the length of the cut provided at the front end of each oscillator, the higher the resonance frequency of each antenna, and the shorter the length of the cut provided at the front end of each oscillator, the lower the resonance frequency of each antenna. Thus, it can be said that the resonance frequency of the low-frequency band near the 600 MHz band of each antenna can be arbitrarily adjusted according to the size of the cut provided at the front end of each oscillator.

[0104] In the embodiment, cuts are provided at the front ends of the oscillators of both the first antenna 300a and the second antenna 300b. However, cuts may be provided only at the front ends of the oscillators of either the first antenna 300a or the second antenna 300b. Further, in the embodiment, cuts are provided at the front ends of all four oscillators of the first antenna 300a. However, cuts may be provided at the front ends of at least one of the four oscillators of the first antenna 300a. The same applies to the second antenna 300b. Also in this case, the resonance frequency of the low-frequency band near the 600 MHz band of the antenna provided with the cut can be arbitrarily adjusted according to the size of the cut.

[0105] Figure 12 is a perspective view of the antenna unit 300A of Modification 1. The antenna unit 300A of Modification 1 is the same as the antenna unit 300 of the embodiment except for the following aspects.

[0106] The antenna unit 300A has a first antenna 300aA and a second antenna 300bA. The first antenna 300aA includes a first substrate 302A, a first oscillator 310A, a second oscillator 320A, a third oscillator 330A, and a fourth oscillator 340A. The second antenna 300bA includes a second substrate 304A, a fifth oscillator 350A, a sixth oscillator 360A, a seventh oscillator 370A, and an eighth oscillator 380A.

[0107] The first oscillator 310A includes a first arm portion 312A, a first side portion 314A, and a first extension portion 316A. The second oscillator 320A includes a second arm portion 322A, a second side portion 324A, and a third extension portion 336A. The third oscillator 330A includes a third arm portion 332A, a third side portion 334A, and a third extension portion 336A. The fourth oscillator 340A includes a fourth arm portion 342A, a fourth side portion 344A, and a fourth extension portion 346A.

[0108] The fifth oscillator 350A includes a fifth arm portion 352A, a fifth side portion 354A, and a fifth extension portion 356A. A first protrusion 352aA is provided on the fifth arm portion 352A. A second protrusion 356aA is provided on the fifth extension portion 356A. The sixth oscillator 360A includes a sixth arm portion 362A, a sixth side portion 364A, and a sixth extension portion 366A. A third protrusion 362aA is provided on the sixth arm portion 362A. A fourth protrusion 366aA is provided on the sixth extension portion 366A. The seventh oscillator 370A includes a seventh arm portion 372A, a seventh side portion 374A, and a seventh extension portion 376A. A fifth protrusion 372aA is provided on the seventh arm portion 372A. A sixth protrusion 376aA is provided on the seventh extension portion 376A. The eighth oscillator 380A includes an eighth arm portion 382A, an eighth side portion 384A, and an eighth extension portion 386A. A seventh protrusion 382aA is provided on the eighth arm portion 382A. An eighth protrusion 386aA is provided on the eighth extension portion 386A.

[0109] The first oscillator 310A will be described. Unless otherwise specified, the matters described below for the first oscillator 310A are the same for the second oscillator 320A, the third oscillator 330A, and the fourth oscillator 340A, except for the aspect in which the second oscillator 320A, the third oscillator 330A, and the fourth oscillator 340A are arranged substantially symmetrically with respect to the first oscillator 310A.

[0110] The width of the first oscillator 310A increases as it moves away from the base end portion of the first oscillator 310A. Specifically, the width of the first arm portion 312A gradually increases as it moves away from the base end portion of the first oscillator 310A. When viewed from the +Z side, the outer edge on the -Z side of the first side portion 314A and the outer edge on the -X side of the first extension portion 316A form an angle that opens approximately 90° (intersects at an angle of approximately 90°). Specifically, when viewed from the +Z side, the first extension portion 316A has a substantially rectangular shape with the broken line of the first side portion 314A and the first extension portion 316A as the long side. The same applies to the second extension portion 326A.

[0111] The width of the third oscillator 330A increases as it moves away from the base end portion of the third oscillator 330A. Specifically, the width of the third arm portion 332A gradually increases as it moves away from the base end portion of the third oscillator 330A. When viewed from the +Z side, the outer edge on the -Z side of the third side portion 334A and the outer edge on the -X side of the third extension portion 336A form an angle that opens approximately 90°. Specifically, when viewed from the +Z side, the outer edge on the +Y side of the third extension portion 336A has a stepped shape. The same applies to the fourth extension portion 346A.

[0112] By appropriately adjusting the shapes of the respective extension portions, the VSWR characteristics in the intermediate frequency band and high frequency band of the first antenna 300aA can be improved. For example, when an angle that opens approximately 90° is formed at the outer edge of each side portion and the outer edge of each extension portion, compared with the case where an angle that opens obtusely from each arm portion toward each side portion and each extension portion is formed at the outer edge of each side portion and the outer edge of each extension portion, the VSWR characteristics in the intermediate frequency band and high frequency band near 2500 MHz to 5000 MHz of the first antenna 300aA can be made good.

[0113] In Modification 1, at least a part of the outer edges of all four oscillators of the first antenna 300aA form an angle that opens approximately 90°. However, it may also be that at least a part of the outer edge of at least one of the four oscillators of the first antenna 300aA forms an angle that opens approximately 90°.

[0114] The fifth oscillator 350A will be described. Unless otherwise specified, the matters described below for the fifth oscillator 350A also apply to the sixth oscillator 360A, the seventh oscillator 370A, and the eighth oscillator 380A, except for the aspect in which the sixth oscillator 360A, the seventh oscillator 370A, and the eighth oscillator 380A are arranged substantially symmetrically with respect to the fifth oscillator 350A.

[0115] When viewed from the +Z side, the first protrusion 352aA protrudes toward the +Y side from the edge on the +Z side near the central portion in the X direction of the fifth arm portion 352A. When viewed from the +Z side, the second protrusion 356aA protrudes toward the -Y side from the -X-Y side corner of the fifth extension portion 356A. The first protrusion 352aA and the second protrusion 356aA overlap each other in the Z direction. In Figure 12 In the example shown, the second protrusion 356aA is disposed on the +Z side of the first protrusion 352aA. The first protrusion 352aA and the second protrusion 356aA are electrically connected to each other by, for example, soldering. Thus, the first protrusion 352aA and the second protrusion 356aA are connection portions for electrically connecting the fifth arm portion 352A and the fifth extension portion 356A to each other.

[0116] The width of the fifth oscillator 350A increases as it moves away from the base end portion of the fifth oscillator 350A. Specifically, the width of the fifth arm portion 352A gradually increases as it moves from the base end portion of the fifth oscillator 350A towards the connecting portion of the first protrusion 352aA and the second protrusion 356aA. Through the connecting portion of the first protrusion 352aA and the second protrusion 356aA, the width of the fifth arm portion 352A can move from the connecting portion of the first protrusion 352aA and the second protrusion 356aA towards the fifth side portion 354A and the fifth extension portion 356A, substantially equivalent to the sum of the width of the fifth extension portion 356A and the width of the fifth arm portion 352A or the fifth side portion 354A. Therefore, compared with the case where the first protrusion 352aA and the second protrusion 356aA are not provided, the fifth oscillator 350A in a state where the fifth arm portion 352A, the fifth side portion 354A, and the fifth extension portion 356A are unfolded in substantially the same plane can be made closer to the ideal bowtie antenna shape. Thus, compared with the case where the first protrusion 352aA and the second protrusion 356aA are not provided, the VSWR characteristics in the intermediate frequency band and high frequency band near 2500 MHz to 5000 MHz of the second antenna 300bA can be made good.

[0117] In Modification 1, all four oscillators of the second antenna 300bA have connecting portions that electrically connect the specified portions of the respective oscillators to each other. However, it is also possible that at least one of the four oscillators of the second antenna 300bA has a connecting portion that electrically connects the specified portions of the at least one oscillator to each other.

[0118] Figure 13 It is a perspective view of the antenna portion 300K of the comparative example. The antenna portion 300K of the comparative example is the same as the antenna portion 300 of the embodiment except for the following aspects.

[0119] The antenna portion 300K has a first antenna 300aK and a second antenna 300bK. The first antenna 300aK includes a first substrate 302K, a first oscillator 310K, a second oscillator 320K, a third oscillator 330K, and a fourth oscillator 340K. The second antenna 300bK includes a second substrate 304K, a fifth oscillator 350K, a sixth oscillator 360K, a seventh oscillator 370K, and an eighth oscillator 380K.

[0120] The first oscillator 310K includes a first arm portion 312K, a first side portion 314K, and a first extension portion 316K. The second oscillator 320K includes a second arm portion 322K, a second side portion 324K, and a second extension portion 326K. The third oscillator 330K includes a third arm portion 332K, a third side portion 334K, and a third extension portion 336K. The fourth oscillator 340K includes a fourth arm portion 342K, a fourth side portion 344K, and a fourth extension portion 346K.

[0121] The fifth oscillator 350K includes a fifth arm portion 352K, a fifth side portion 354K, and a fifth extension portion 356K. The sixth oscillator 360K includes a sixth arm portion 362K, a sixth side portion 364K, and a sixth extension portion 366K. The seventh oscillator 370K includes a seventh arm portion 372K, a seventh side portion 374K, and a seventh extension portion 376K. The eighth oscillator 380K includes an eighth arm portion 382K, an eighth side portion 384K, and an eighth extension portion 386K.

[0122] At the front end portions of the first side portion 314, the second side portion 324K, the third side portion 334K, and the fourth side portion 344K of the comparative example, there are no cuts corresponding to the first cut 318, the second cut 328, the third cut 338, and the fourth cut 348 of the embodiment. At the front end portions of the fifth side portion 354K, the sixth side portion 364K, and the seventh side portion 374K of the comparative example, there are no cuts corresponding to the fifth cut 358, the sixth cut 368, and the seventh cut 378 of the embodiment.

[0123] When viewed from the +Z side, the first extension portion 316K of the comparative example has a substantially trapezoidal shape with a broken line having the first side portion 314K and the second side portion 324K as the lower base. The same applies to the second extension portion 326K, the third extension portion 336K, and the fourth extension portion 346K of the comparative example.

[0124] In the fifth oscillator 350K of the comparative example, there are no protrusions corresponding to the first protrusion 352aA and the second protrusion 356aA of Modification 1. The same applies to the sixth oscillator 360K, the seventh oscillator 370K, and the eighth oscillator 380K of the comparative example.

[0125] Figure 14 It is a graph showing the frequency characteristics of the VSWR of the first antenna 300aA of Modification 1.1 and the first antenna 300aK of Comparative Example 1.1 in the range of 500 MHz to 5000 MHz. Figure 15 It is a graph showing the frequency characteristics of the VSWR of the second antenna 300bA of Modification 1.1 and the second antenna 300bK of Comparative Example 1.1 in the range of 500 MHz to 5000 MHz.

[0126] The antenna unit 300A of Modification 1.1 is an example of the antenna unit 300A of Modification 1.

[0127] The antenna unit 300K of Comparative Example 1.1 is an example of the antenna unit 300K of the comparative example.

[0128] As Figure 15As shown, in substantially the entire frequency band from 2500 MHz to 5000 MHz, the VSWR of the second antenna 300bA of the modified example 1.1 is lower than that of the second antenna 300bK of the comparative example 1.1. As a result, it is revealed that in the case where a connection portion for electrically connecting the specified portions of the respective elements of the second antenna 300bB is provided, compared with the case where no connection portion for electrically connecting the specified portions of the respective elements of the second antenna 300bB is provided, the VSWR characteristics in the intermediate frequency band and the high frequency band near 2500 MHz to 5000 MHz of the second antenna 300bB can be made good.

[0129] In the modified example 1, the respective elements of the first antenna 300aA do not have a connection portion for electrically connecting the specified portions of the respective elements of the first antenna 300aA. However, the respective elements of the first antenna 300aA may also have a connection portion for electrically connecting the specified portions of the respective elements of the first antenna 300aA. In this example, the second antenna 300bB may also have a connection portion for electrically connecting the specified portions of the respective elements of the second antenna 300bB, or may not have such a connection portion.

[0130] Figure 16 It is a perspective view of the antenna unit 300B of the modified example 2. The antenna unit 300B of the modified example 2 is the same as the antenna unit 300 of the embodiment except for the following aspects.

[0131] The antenna unit 300B has a first antenna 300aB and a second antenna 300bB. The first antenna 300aB includes a first substrate 302B, a first element 310B, a second element 320B, a third element 330B, and a fourth element 340B. The second antenna 300bB includes a second substrate 304B, a fifth element 350B, a sixth element 360B, a seventh element 370B, and an eighth element 380B.

[0132] The first element 310B includes a first arm portion 312B, a first side portion 314B, and a first extension portion 316B. The second element 320B includes a second arm portion 322B, a second side portion 324B, and a second extension portion 326B. The third element 330B includes a third arm portion 332B, a third side portion 334B, and a third extension portion 336B. The fourth element 340B includes a fourth arm portion 342B, a fourth side portion 344B, and a fourth extension portion 346B.

[0133] The fifth oscillator 350B includes a fifth arm portion 352B, a fifth side portion 354B, and a fifth extension portion 356B. The sixth oscillator 360B includes a sixth arm portion 362B, a sixth side portion 364B, and a sixth extension portion 366B. The seventh oscillator 370B includes a seventh arm portion 372B, a seventh side portion 374B, and a seventh extension portion 376B. The eighth oscillator 380B includes an eighth arm portion 382B, an eighth side portion 384B, and an eighth extension portion 386B.

[0134] The first oscillator 310B will be described. Unless otherwise specified, the matters described below for the first oscillator 310B are the same for the sixth oscillator 360B, the seventh oscillator 370B, and the eighth oscillator 380B, except for the aspect in which the sixth oscillator 360B, the seventh oscillator 370B, and the eighth oscillator 380B are arranged substantially symmetrically with respect to the fifth oscillator 350B.

[0135] When viewed from the +Z side, the width of the first extension portion 316B in the Y direction gradually increases as it moves away from the first arm portion 312B. When viewed from the +Z side, the outer edge on the -Y side of the first extension portion 316B has an arc shape. Specifically, when viewed from the +Z side, the first extension portion 316B is in a substantially elliptical fan shape with a central angle of approximately 90°. In this case, compared with the case where the outer edge on the -Y side of the first extension portion 316B is linear when viewed from the +Z side, the first oscillator 310B can be made closer to the ideal semi-circular bowtie antenna shape. Thus, compared with the case where the outer edge on the -Y side of the first extension portion 316B is linear when viewed from the +Z side, the VSWR characteristics in the high-frequency band around 3250 MHz to 5000 MHz of the first antenna 300aB can be made good.

[0136] The fifth oscillator 350B will be described. Unless otherwise specified, the matters described below for the fifth oscillator 350B are the same for the sixth oscillator 360B, the seventh oscillator 370B, and the eighth oscillator 380B, except for the aspect in which the sixth oscillator 360B, the seventh oscillator 370B, and the eighth oscillator 380B are arranged substantially symmetrically with respect to the fifth oscillator 350B.

[0137] When observed from the +Z side, the width of the fifth extension portion 356B in the X direction gradually increases as it moves away from the fifth arm portion 352B. When observed from the +Z side, the outer edge on the -X side of the fifth extension portion 356B has an arc shape. Specifically, when observed from the +Z side, the fifth extension portion 356B is in a substantially elliptical sector shape with a central angle of approximately 90°. In this case, compared with the case where the outer edge on the -X side of the fifth extension portion 356B is in a straight line shape when observed from the +Z side, the fifth oscillator 350B can be made closer to the ideal semi-circular bowtie antenna shape. As a result, compared with the case where the outer edge on the -X side of the fifth extension portion 356B is in a straight line shape when observed from the +Z side, the VSWR characteristics in the high-frequency band around 3250 MHz to 5000 MHz of the second antenna 300bB can be made good.

[0138] In Modification 2, at least a part of the outer edges of the respective oscillators of both the first antenna 300aB and the second antenna 300bB has an arc shape. However, it may also be that at least a part of the outer edges of the respective oscillators of only one of the first antenna 300aB and the second antenna 300bB has an arc shape. Additionally, in Modification 2, at least a part of the outer edges of all four oscillators of the first antenna 300aB has an arc shape. However, it may also be that at least a part of the outer edge of at least one of the four oscillators of the first antenna 300aB has an arc shape. The same applies to the second antenna 300bB.

[0139] Figure 17 It is a graph showing the frequency characteristics of the VSWR of the first antenna 300aB of Modification 2.1 and the first antenna 300aK of Comparative Example 1.1 at 500 MHz to 5000 MHz. Figure 18 It is a graph showing the frequency characteristics of the VSWR of the second antenna 300bB of Modification 2.1 and the second antenna 300bK of Comparative Example 1.1 at 500 MHz to 5000 MHz.

[0140] The antenna unit 300B of Modification 2.1 is an example of the antenna unit 300B of Modification 2.

[0141] As Figure 17 shown, in substantially the entire frequency band from 3250 MHz to 5000 MHz, the VSWR of the first antenna 300aB of Modification 2.1 is lower than the VSWR of the first antenna 300aK of Comparative Example 1.1. As a result, it is revealed that when at least a part of the outer edge of the oscillator has an arc shape, compared with the case where no part of the outer edge of the oscillator has an arc shape, the VSWR characteristics in the high-frequency band around 3250 MHz to 5000 MHz of the first antenna 300aB can be made good.

[0142] As Figure 18As shown, in substantially the entire frequency band from 3250 MHz to 5000 MHz, the VSWR of the second antenna 300bB of the modified example 2.1 is lower than that of the second antenna 300bK of the comparative example 1.1. As a result, it is revealed that when at least a part of the outer edge of the oscillator has an arc, compared with the case where no part of the outer edge of the oscillator has an arc, the VSWR characteristics in the high-frequency band near 3250 MHz to 5000 MHz of the second antenna 300bB can be made good.

[0143] In the modified example 2, at least a part of the outer edge of each oscillator of both the first antenna 300aB and the second antenna 300bB has an arc. However, it may also be that at least a part of the outer edge of each oscillator of only one of the first antenna 300aB and the second antenna 300bB has an arc. Also in this case, the VSWR characteristics in the high-frequency band near 3250 MHz to 5000 MHz of the antenna in which at least a part of the outer edge of each oscillator has an arc can be made good.

[0144] As described above, the embodiments and modified examples of the present invention have been described with reference to the drawings, but these are examples of the present invention, and various structures other than the above can also be adopted.

[0145] For example, the antenna device 10 of the embodiment includes an antenna unit 300 connected to two cables, the first cable 410 and the second cable 420. However, the matters described in the embodiment can also be applied to, for example, an antenna device including a GNSS (Global Navigation Satellite System) antenna connected to one cable.

[0146] In the antenna device 10 of the embodiment, a surrounding groove 112 for embedding the waterproof gasket 200 is provided in the base 110. However, the surrounding groove 112 may not be provided in the base 110 but in the housing 120.

[0147] According to this specification, an antenna device providing the following solutions is provided.

[0148] (Solution 1.1)

[0149] In Solution 1.1, the antenna device includes a housing, an antenna unit housed in the housing, a cable electrically connected to the antenna unit, a waterproof gasket surrounding at least a part of the antenna unit, and a grommet through which the cable passes, and at least a part of the waterproof gasket overlaps at least a part of the grommet.

[0150] The "cable" corresponds to the "second cable" of the above embodiment. The "grommet" corresponds to the "second grommet" of the above embodiment.

[0151] According to the above solution, the periphery of the antenna part in the housing can be waterproofed by the waterproof gasket. The part of the housing through which the cable passes can be waterproofed by the grommet. In the above solution, compared with the case where the waterproof gasket and the grommet are integrated, the assemblability of the antenna device can be improved. In the above solution, compared with the case where the waterproof gasket and the grommet do not overlap, the size of the antenna device can be reduced. Therefore, compared with the case where the waterproof gasket and the grommet are integrated and the case where the waterproof gasket and the grommet do not overlap, it is possible to improve the assemblability of the antenna device and reduce the size of the antenna device while ensuring the waterproofness of the antenna device.

[0152] (Solution 1.2)

[0153] In Solution 1.2, the above waterproof gasket and the above grommet have substantially flush surfaces pressed by the above housing.

[0154] According to the above solution, compared with the case where the surfaces of the waterproof gasket and the grommet do not have substantially flush surfaces (there is a step difference between the two), the intrusion of water into the interface between the waterproof gasket and the grommet can be suppressed.

[0155] (Solution 1.3)

[0156] In Solution 1.3, the above waterproof gasket defines a recess overlapping at least a part of the above grommet.

[0157] According to the above solution, compared with the case where the waterproof gasket does not define a recess, the size of the recess of the waterproof gasket and the grommet in the depth direction can be reduced. According to the above solution, compared with the case where the waterproof gasket does not define a recess, the waterproof gasket and the grommet can easily have substantially flush surfaces pressed by the housing.

[0158] (Solution 1.4)

[0159] In Solution 1.4, the above waterproof gasket allows a cable different from the above cable to pass through.

[0160] According to the above solution, compared with the case where the waterproof gasket and the grommet are integrated and the case where the waterproof gasket and the grommet do not overlap, it is possible to improve the assemblability of the antenna device and reduce the size of the antenna device while ensuring the waterproofness of the antenna device.

[0161] (Solution 2.1)

[0162] In Solution 2.1, the antenna device includes a plurality of oscillators arranged substantially symmetrically, and a notch is provided at the front end of at least one of the plurality of oscillators.

[0163] According to the above solution, the resonant frequency in the low frequency band of an antenna having a plurality of vibrators can be arbitrarily adjusted according to the size of the notch provided at the front end portion of the vibrator. Thereby, the characteristics in a desired frequency band of a wideband antenna can be adjusted.

[0164] (Solution 2.2)

[0165] In Solution 2.2, the antenna device further includes a plurality of other vibrators that are arranged substantially symmetrically and at least a part of which overlaps at least a part of the plurality of vibrators, and a notch is provided at the front end portion of at least one vibrator among the plurality of other vibrators.

[0166] According to the above solution, the resonant frequency in the low frequency band of an antenna having a plurality of other vibrators can be arbitrarily adjusted according to the size of the notch provided at the front end portion of the other vibrator. Thereby, the characteristics in a desired frequency band of a wideband antenna can be adjusted.

[0167] (Solution 3.1)

[0168] In Solution 3.1, the antenna device includes a plurality of vibrators that are arranged substantially symmetrically, and at least one of the plurality of vibrators has a connecting portion that electrically connects a specified portion of the at least one vibrator to each other.

[0169] According to the above solution, compared with the case where there is no connecting portion that electrically connects the specified portions of the vibrators to each other, the antenna can be made closer to the shape of an ideal bow-tie antenna. Thereby, compared with the case where this connecting portion is not provided, the VSWR characteristics in the intermediate frequency band and the high frequency band can be made good. Therefore, the characteristics in a desired frequency band of a wideband antenna can be adjusted.

[0170] (Solution 3.2)

[0171] In Solution 3.2, the antenna device further includes a plurality of other vibrators that are arranged substantially symmetrically and at least a part of which overlaps at least a part of the plurality of vibrators, and at least a part of the outer edge of at least one of the plurality of other vibrators forms an angle of approximately 90° that is substantially open.

[0172] According to the above solution, by appropriately adjusting the shape of the other vibrator, the VSWR characteristics in the intermediate frequency band and the high frequency band of an antenna having a plurality of other vibrators can be improved.

[0173] (Solution 4.1)

[0174] In Solution 4.1, the antenna device includes a plurality of vibrators that are arranged substantially symmetrically, and at least a part of the outer edge of at least one of the plurality of vibrators has an arc shape.

[0175] According to the above solution, compared with the case where any part of the outer edge of the oscillator does not have an arc, the antenna having a plurality of oscillators can be made closer to the ideal semi-circular bow-tie antenna shape. Thus, compared with the case where any part of the outer edge of the oscillator does not have an arc, the VSWR characteristics in the high-frequency band can be made good. Therefore, the characteristics of the desired frequency band of the broadband antenna can be adjusted.

[0176] (Solution 4.2)

[0177] In Solution 4.2, the antenna device further includes a plurality of other oscillators that are arranged substantially symmetrically and at least a part of which overlaps at least a part of the plurality of oscillators, and at least a part of the outer edge of at least one of the plurality of other oscillators has an arc.

[0178] According to the above solution, compared with the case where any part of the outer edge of the other oscillator does not have an arc, the antenna having a plurality of other oscillators can be made closer to the ideal semi-circular bow-tie antenna shape. Thus, compared with the case where any part of the outer edge of the other oscillator does not have an arc, the VSWR characteristics in the high-frequency band can be made good. Therefore, the characteristics of the desired frequency band of the broadband antenna can be adjusted.

[0179] This application claims priority based on Japanese Patent Application No. 2022-186267 filed on November 22, 2022, and incorporates its entire disclosure herein.

[0180] Description of Reference Numerals

[0181] 10 Antenna device, 100 housing, 102 screw, 110 base, 112 surrounding groove, 114 columnar protrusion, 116 ventilation filter, 120 housing body, 122 pressing rib, 122a front end, 200 waterproof gasket, 200a pressed surface, 202 recess, 210 first grommet, 210a waterproof rib, 212 first base end portion, 214 first protrusion, 216 first communication portion, 220 second grommet, 222 second base end portion, 222a first surface, 222b second surface, 224 second protrusion, 226 second communication portion, 226a fixing groove, 300, 300A, 300B, 300K antenna portion, 300a, 300aA, 300aB, 300aK first antenna, 300b, 300bA, 300bB, 300bK second antenna, 302, 302A, 302B, 302K first substrate, 304, 304A, 304B, 304K second substrate, 310, 310A, 310B, 310K first oscillator, 312, 312A, 312B, 312K first arm portion, 314, 314A, 314B, 314K first side portion, 316, 316A, 316B, 316K first extension portion, 318 first notch, 320, 320A, 320B, 320K second oscillator, 322, 322A, 322B, 322K second arm portion, 324, 324A, 324B, 324K second side portion, 326, 326A, 326B, 326K second extension portion, 328 second notch, 330, 330A, 330B, 330K third oscillator, 332, 332A, 332B, 332K third arm portion, 334, 334A, 334B, 334K third side portion, 336, 336A, 336B, 336K third extension portion, 338 third notch, 340, 340A, 340B, 340K fourth oscillator, 342, 342A, 342B, 342K fourth arm portion, 344, 344A, 344B, 344K fourth side portion, 346, 346A, 346B, 346K fourth extension portion, 348 fourth notch, 350, 350A, 350B, 350K fifth oscillator, 352, 352A, 352B, 352K fifth arm portion, 352aA first protrusion, 354, 354A, 354B, 354K fifth side portion, 356, 356A, 356B, 356K fifth extension portion, 356aA second protrusion, 358 fifth notch, 360, 360A, 360B, 360K sixth oscillator, 362, 362A, 362B, 362K sixth arm portion, 362aA third protrusion, 364, 364A, 364B, 364K sixth side portion, 366, 366A, 366B, 366K sixth extension portion, 366aA fourth protrusion, 368 sixth notch, 370, 370A, 370B, 370K seventh oscillator7th arm of 372, 372A, 372B, 372K, 5th protrusion of 372aA, 7th lateral part of 374, 374A, 374B, 374K, 7th extension of 376, 376A, 376B, 376K, 6th protrusion of 376aA, 7th notch of 378, 8th oscillator of 380, 380A, 380B, 380K, 8th arm of 382, 382A, 382B, 382K, 7th protrusion of 382aA, 8th lateral part of 384, 384A, 384B, 384K, 8th extension of 386, 386A, 386B, 386K, 8th protrusion of 386aA, 8th notch of 388, 1st cable of 410, 1st ferrite core of 412, 2nd cable of 420, 2nd ferrite core of 422, 1st imaginary line of L1, 2nd imaginary line of L2.,

Claims

1. An antenna device, wherein, It has a plurality of oscillators arranged substantially symmetrically. A notch is provided at the front end of at least one of the plurality of oscillators.

2. The antenna device according to claim 1, wherein, It further has a plurality of other oscillators arranged substantially symmetrically and at least a part of which overlaps at least a part of the plurality of oscillators. A notch is provided at the front end of at least one of the plurality of other oscillators.

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