Antenna device

Abstract

An antenna device (100) comprises a mounting plate (103) having circuitry for processing radio signals; a dipole antenna element (101) placed on the mounting plate (103) and receiving the radio signals; a first conductor (121) parallel to the dipole antenna element (101); a second conductor (122) connected to a first end of the first conductor (121) at an angle greater than zero but less than 180 degrees with respect to the first end; and a third conductor (123) connected to a second end of the first conductor (121) at an angle greater than zero but less than 180 degrees with respect to the second end. At least an end of the second conductor (122) has a parasitic element located in the vicinity of the dipole antenna element.

Description

TECHNICAL FIELD

[0001] The present application relates to an antenna device. BACKGROUND

[0002] In recent years, wireless products have rapidly shifted from human-related wireless products to object-related wireless products. For example, there are now wireless vehicles, wireless vending machines, wireless trains, wireless factory monitoring systems, etc. With respect to such products, in particular, the importance of GPS, which can provide position information, is increasing, and the number of radio waves that can be captured from the sky is an important selling point for these products.

[0003] Furthermore, in mobile terminals such as smart phones, the direction of the base station and the direction of the terminal are always changing and thus it is not known from where the radio waves are arriving. Therefore, a non-directional antenna is generally used. On the other hand, there are systems such as the global positioning system (GPS), in which radio waves always arrive from the sky. Furthermore, in the case of a fixedly installed terminal, it is desirable that the antenna have directivity only in the sky direction.

[0004] In the above cases, generally, a patch antenna is often used. In many cases, the main body of the communication device has a thin structure, and it can be placed vertically when it is desired to reduce the area in which the communication device is installed. Patent Document 1 discloses an antenna that includes a linear radiating antenna element to which power is fed and a plurality of linear parasitic antenna elements to which power is not fed, in which the parasitic antenna elements are disposed at a position where the radiating antenna element and the parasitic antenna elements cross each other without directly contacting each other, and in which each of the crossing portions of the plurality of parasitic antenna elements, the portion that crosses the radiating antenna element, is bent so that the crossing portion of the parasitic antenna element is parallel to the radiating antenna element.

[0005] However, because the patch-type GPS antenna has directivity in the sky direction by being installed to be flat, it must be installed thus and therefore its installation area becomes large. Furthermore, because this antenna is configured separately from the main body of the communication device, there is the disadvantage that it is expensive.

[0006] Alternatively, a method for drawing the circuit of an antenna on the board of a product can be employed. However, the gain is small and the GPS satellite acquisition performance is poor.

[0007] LIST OF CITATIONS

[0008] PATENT LITERATURE

[0009] Patent Document 1: Japanese Unexamined Patent Application Publication No. 2008-35219 SUMMARY

[0010] TECHNICAL PROBLEM

[0011] As described above, there is a problem that an antenna device capable of being installed in a small area and obtaining sufficient gain is expensive because it is configured to be separated from a main body of a communication device.

[0012] In view of the above-described problem, an object of the present disclosure is to provide an antenna device capable of solving the above problem. That is, it can be implemented at low cost and can minimize its installation area.

[0013] SOLUTION TO THE PROBLEM

[0014] An antenna device according to an exemplary embodiment includes a mounting plate including a circuit configured to process a radio signal; a dipole antenna element configured to receive the radio signal, the dipole antenna element being placed in the mounting plate; and a parasitic element including a first wire, a second wire, and a third wire, the first wire being parallel to the dipole antenna element, the second wire being connected to the first wire at a first end portion of the first wire at an angle greater than 0 degrees and less than 180 degrees, the third wire being connected to the first wire at a second end portion of the first wire at an angle greater than 0 degrees and less than 180 degrees, wherein at least an end portion of the second wire is positioned near the dipole antenna element.

[0015] An antenna device according to an exemplary embodiment includes a mounting plate including a circuit configured to process a radio signal; a dipole antenna element configured to receive the radio signal, the dipole antenna element being placed in the mounting plate; and a parasitic element including a first wire, a second wire, and a third wire, the first wire being parallel to the dipole antenna element, the second wire being connected to the first wire at a first end portion of the first wire at an angle greater than 0 degrees and less than 180 degrees, the third wire being connected to the second wire at an end portion of the second wire at an angle greater than 0 degrees and less than 180 degrees, wherein at least the end portion of the second wire and the third wire are positioned near the dipole antenna element.

[0016] ADVANTAGEOUS EFFECT OF THE INVENTION

[0017] According to the present invention, an antenna device capable of solving the above problem can be provided. That is, it can be implemented at low cost and can minimize its installation area. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a perspective view showing a schematic configuration of an antenna device according to a first exemplary embodiment;

[0019] Figure 2 is a perspective view showing a schematic configuration of an antenna device according to a second exemplary embodiment;

[0020] Figure 3 is a graph showing directivity of the antenna device according to the second exemplary embodiment;

[0021] Figure 4 is a diagram showing an example of a dipole antenna installed in a mounting plate;

[0022] Figure 5 is a graph showing the directivity of a dipole antenna;

[0023] Figure 6 is a perspective view showing a schematic configuration of an antenna device according to a third exemplary embodiment;

[0024] Figure 7 is a perspective view showing a schematic configuration of an antenna device according to a fourth exemplary embodiment;

[0025] Figure 8 is a perspective view showing a schematic configuration of an antenna device according to a fifth exemplary embodiment;

[0026] Figure 9 is a perspective view showing a schematic configuration of an antenna device according to a sixth exemplary embodiment; and

[0027] Figure 10 is a perspective view showing a schematic configuration of an antenna device according to a seventh exemplary embodiment. DETAILED DESCRIPTION

[0028] Exemplary embodiments of the present invention will be described hereinafter with reference to the drawings.

[0029] First Exemplary Embodiment

[0030] Figure 1 : is a perspective view showing a schematic configuration of an antenna device according to a first exemplary embodiment. Figure 1 In FIG. 1 , antenna device 100 includes a dipole antenna element 101 , a parasitic antenna element 102 , and a mounting plate 103 .

[0031] Dipole antenna element 101 is placed in mounting board 103 and receives a radio signal. Dipole antenna element 101 is an antenna element in which two linear conductors extend symmetrically.

[0032] The parasitic antenna element 102 includes a first wire 121 parallel to the dipole antenna element 101, a second wire 122 connected to the first wire 121 at a first end portion of the first wire 121 at an angle greater than 0 degrees and less than 180 degrees, and a third wire 123 connected to the first wire 121 at a second end portion of the first wire 121 at an angle greater than 0 degrees and less than 180 degrees. Further, at least an end portion of the second wire 122 is positioned in the vicinity of the dipole antenna element 101.

[0033] The mounting plate 103 includes a circuit that processes a radio signal received by the dipole antenna element 101.

[0034] As described above, the antenna device according to the first exemplary embodiment can be implemented at low cost and can minimize its mounting area.

[0035] Second Exemplary Embodiment

[0036] Figure 2 is a perspective view that shows a schematic configuration of an antenna device according to a second exemplary embodiment. In Figure 2 The antenna device 200 includes a dipole antenna element 201, a parasitic antenna element 202, and a mounting plate 203.

[0037] The dipole antenna element 201 is an antenna element in which two linear wires extend symmetrically from a feeding point. The two linear wires of the dipole antenna element 201 are arranged at positions spaced apart from the mounting plate 203. The two linear wires of the dipole antenna element 201 are connected to a circuit of the mounting plate 203 through the feeding point. The dipole antenna element 201 is placed in the mounting plate 203 and receives a radio signal. The radio signal is, for example, a positioning signal.

[0038] The parasitic antenna element 202 includes three wires of a first wire 221, a second wire 222, and a third wire 223. The first wire 221 and the second wire 222 are connected to each other at a first end portion of the first wire 221 in the LW plane at an angle greater than 0 degrees and less than 180 degrees. The angle formed by the first wire 221 and the second wire 222 in the LW plane is preferably 90 degrees.

[0039] Further, the first wire 221 and the third wire 223 are connected to each other at a second end portion of the first wire 221 in the LW plane at an angle greater than 0 degrees and less than 180 degrees. The angle formed by the first wire 221 and the third wire 223 in the LW plane is preferably 90 degrees.

[0040] Further, the parasitic antenna element 202 is a parasitic antenna element that is not connected to a circuit of the mounting plate 203. Further, in the parasitic antenna element 202, the first conductive wire 221 is placed parallel to one side of the mounting plate 203 at a position apart from the mounting plate 203.

[0041] Among the three linear conductive wires, one end of each of the second and third conductive wires 222 and 223 is connected to the end of the first conductive wire 221 and the other end of each of the second and third conductive wires 222 and 223 is placed in the vicinity of the dipole antenna element 201. The distance between each of the respective ends of the second and third conductive wires 222 and 223 and the dipole antenna element 201 is preferably within one-twentieth of the wavelength of the target frequency. In other words, the above statement that the respective ends of the second and third conductive wires 222 and 223 are placed in the vicinity of the dipole antenna element 201 means that the second and third conductive wires 222 and 223 are positioned so that their respective ends are spatially coupled to the dipole antenna element 201. In order to perform the aforementioned spatial coupling, it is necessary to bring the second and third conductive wires 222 and 223 close to the end point of the antenna, i.e., the part of the antenna where the flowing high-frequency current is small and the voltage is large. Further, in the dipole antenna, the power feeding side (in the case of the device 200, the conductive wire 222) needs to satisfy the above condition.

[0042] Further, the direction in which the third conductive wire 223 extends is parallel to the direction in which the second conductive wire 222 extends.

[0043] Further, the total length of the parasitic antenna element 202 is preferably one-half of the wavelength of the radio signal to be received, i.e., the so-called half wavelength.

[0044] The mounting plate 203 is a plate that is connected to the dipole antenna element 201 and includes a circuit that processes the radio signal received by the dipole antenna element 201. For example, the mounting plate 203 can be a printed circuit board that includes a circuit that measures the position of the antenna device 200 from a positioning signal (e.g., a Global Navigation Satellite System (GNSS) signal). Because the mounting plate 203 is not connected to the parasitic antenna element 202, the parasitic antenna element 202 functions as a parasitic antenna element. For example, the mounting plate 203 can include a square metal layer formed as GND on one surface thereof. This metal layer for GND is a layer with a reference potential. Further, the metal layer for GND can be formed in one of the layers of a laminated board.

[0045] Because the antenna device 200 includes Figure 2 the non-contact parasitic element shown, it differs from an antenna device that includes only a dipole antenna. As shown in Figure 2 the dipole antenna element 201 and the parasitic antenna element 202 are spatially coupled to each other at their respective front ends.

[0046] Figure 3 is a graph showing the directivity of the antenna device according to the second exemplary embodiment. Figure 3 The directivity of the antenna device 200 is shown in a vertical plane (HL plane). Figure 2

[0047] The dipole antenna to be compared with the antenna device is as follows. Figure 4 is a graph showing an example of a dipole antenna installed in a mounting plate. In Figure 4 , the dipole antenna device 400 includes a dipole antenna element 401 and a mounting plate 402.

[0048] Figure 5 is a graph showing the directivity of the dipole antenna. Figure 5 The directivity of the dipole antenna to be compared with the antenna device 200 is shown in a vertical plane (HL plane). Figure 4

[0049] The comparison between Figure 3 and 5 shows that the reception range of the antenna device 200 is greater than that of the dipole antenna. Therefore, the antenna radiation performance of the antenna device 200 is better than that of the dipole antenna shown in Figure 4 . This is because the high-frequency current as a radio wave source flows through the non-contact parasitic element by the space coupling, and thus the radiation efficiency of the radio wave is improved. According to the present invention, it is possible to increase the gain in the sky direction while maintaining the thickness of the product, and it is possible to use any non-contact parasitic antenna element having a metallic property, and thus it is possible to reduce the cost thereof.

[0050] As described above, the antenna device according to the second exemplary embodiment can be implemented at a low cost and can minimize its installation area.

[0051] When the parasitic antenna element 202 is installed, for example, it can be attached on the back side of the housing, embedded in molding into the housing, or attached on the outside of the housing.

[0052] Third Exemplary Embodiment

[0053] Figure 6 is a perspective view showing the schematic configuration of the antenna device according to the third exemplary embodiment. In Figure 6 , the antenna device 600 includes a dipole antenna element 201, a parasitic antenna element 602, and a mounting plate 203. In Figure 6 , the same members as those in Figure 2 are denoted by the same reference numerals, and the description thereof will be omitted.

[0054] ​​The parasitic antenna element 602 includes three conductive lines of a first conductive line 621, a second conductive line 622, and a third conductive line 623.

[0055] The third conductive line 623 extends in a direction perpendicular to a direction in which the second conductive line 622 extends. The direction in which the second conductive line 622 extends is perpendicular to the mounting plate 203. The direction in which the third conductive line 623 extends is parallel to the mounting plate 203.

[0056] The first conductive line 621 and the second conductive line 622 are connected to each other at a first end portion of the first conductive line 621 in the LW plane at an angle greater than 0 degrees and less than 180 degrees. The angle formed by the first conductive line 621 and the second conductive line 622 in the LW plane is preferably 90 degrees.

[0057] One end portion of the second conductive line 622 is connected to an end portion of the first conductive line 621, and the other end portion of the second conductive line 622 is placed in the vicinity of the dipole antenna element 201. That is, the second conductive line 622 is positioned such that both end portions thereof are spatially coupled to the dipole antenna element 201.

[0058] Further, the first conductive line 621 and the third conductive line 623 are connected to each other at a second end portion of the first conductive line 621 in the HW plane at an angle greater than 0 degrees and less than 180 degrees. The angle formed by the first conductive line 621 and the third conductive line 623 in the HW plane is preferably 90 degrees.

[0059] When the parasitic antenna element 602 is mounted, for example, it can be attached to the rear side of the housing, embedded in molding into the housing, or attached to the outer side of the housing.

[0060] Fourth Exemplary Embodiment

[0061] Figure 7 is a perspective view showing a schematic configuration of an antenna device according to the fourth exemplary embodiment. In Figure 7 The antenna device 700 includes the dipole antenna element 201, a parasitic antenna element 702, and the mounting plate 203. In Figure 7 The same members as those in Figure 2 will be omitted.

[0062] The parasitic antenna element 702 includes five conductive lines of a first conductive line 721, a second conductive line 722, a third conductive line 723, a fourth conductive line 724, and a fifth conductive line 725.

[0063] As in Figure 7As shown in FIG. 7, one end portion of each of the second and third conductive wires 722 and 723 is connected to the end portion of the first conductive wire 721 and the other end portion of each of the second and third conductive wires 722 and 723 is placed in the vicinity of the dipole antenna element 201. That is, the second and third conductive wires 722 and 723 are positioned so that their respective end portions are spatially coupled to the dipole antenna element 201. Further, at least a portion of the fourth conductive wire 724 and a portion of the fifth conductive wire 725 are placed in the vicinity of the dipole antenna element 201. The entire fourth conductive wire 724 and the fifth conductive wire 725 are preferably placed in the vicinity of the dipole antenna element 201. That is, the entire fourth conductive wire 724 and the fifth conductive wire 725 are positioned so as to be spatially coupled to the dipole antenna element 201.

[0064] The first and second conductive wires 721 and 722 are connected to each other at the first end portion of the first conductive wire 721 at an angle greater than 0 degrees and less than 180 degrees in the LW plane. The angle formed by the first and second conductive wires 721 and 722 in the LW plane is preferably 90 degrees.

[0065] The second and fourth conductive wires 722 and 724 are connected to each other at the first end portion of the second conductive wire 722 at an angle greater than 0 degrees and less than 180 degrees in the LW plane. The angle formed by the second and fourth conductive wires 722 and 724 in the LW plane is preferably 90 degrees. Further, the first and fourth conductive wires 721 and 724 are preferably parallel to each other in the LW plane.

[0066] Further, the first and third conductive wires 721 and 723 are connected to each other at the second end portion of the first conductive wire 721 at an angle greater than 0 degrees and less than 180 degrees in the HW plane. The angle formed by the first and third conductive wires 721 and 723 in the HW plane is preferably 90 degrees.

[0067] The third and fifth conductive wires 723 and 725 are connected to each other at the first end portion of the third conductive wire 723 at an angle greater than 0 degrees and less than 180 degrees in the LW plane. The angle formed by the third and fifth conductive wires 723 and 725 in the LW plane is preferably 90 degrees. Further, the first and fifth conductive wires 721 and 725 are preferably parallel to each other in the LW plane.

[0068] When the parasitic antenna element 702 is installed, for example, it can be attached on the back side of the housing, embedded in molding into the housing, or attached on the outer side of the housing.

[0069] Fifth Exemplary Embodiment

[0070] Figure 8 is a perspective view showing the schematic configuration of an antenna device according to the fifth exemplary embodiment. In Figure 8In FIG, the antenna device 800 includes a dipole antenna element 201, a parasitic antenna element 802, and a mounting plate 203. Figure 8 In, and Figure 2 Those identical components in the present invention are denoted by the same reference numerals, and description thereof will be omitted.

[0071] The parasitic antenna element 802 includes three conductive lines: a first conductive line 821 , a second conductive line 822 , and a third conductive line 823 .

[0072] As in Figure 8 As shown in FIG, one end of second conductive line 822 is connected to the end of first conductive line 821, and the other end of second conductive line 822 is placed near dipole antenna element 201. That is, second conductive line 822 is positioned so that both ends thereof are spatially coupled to dipole antenna element 201. In addition, at least a portion of third conductive line 823 is placed near dipole antenna element 201. The entire third conductive line 823 is preferably placed near dipole antenna element 201. That is, the entire third conductive line 823 is positioned so as to be spatially coupled to dipole antenna element 201.

[0073] The first conductive line 821 and the second conductive line 822 are connected to each other at a first end portion of the first conductive line 821 at an angle greater than 0 degrees and less than 180 degrees in the LW plane. The angle formed by the first conductive line 821 and the second conductive line 822 in the LW plane is preferably 90 degrees.

[0074] The second wire 822 and the third wire 823 are connected to each other at the first end of the second wire 822 at an angle greater than 0 degrees and less than 180 degrees in the LW plane. The angle formed by the second wire 822 and the third wire 823 in the LW plane is preferably 90 degrees. In addition, the first wire 821 and the third wire 823 are preferably parallel to each other in the LW plane.

[0075] When the parasitic antenna element 802 is mounted, for example, it can be attached on the back side of the housing, insert molded into the housing, or attached on the outside of the housing.

[0076] Sixth Exemplary Embodiment

[0077] Figure 9 : is a perspective view showing a schematic configuration of an antenna device according to a sixth exemplary embodiment. Figure 9 In FIG, the antenna device 900 includes a dipole antenna element 201, a parasitic antenna element 902, and a mounting plate 203. Figure 9 In, and Figure 2 Those identical components in the present invention are denoted by the same reference numerals, and description thereof will be omitted.

[0078] The parasitic antenna element 902 includes three conductive lines of a first conductive line 921, a second conductive line 922, and a third conductive line 923. Each of the first conductive line 921, the second conductive line 922, and the third conductive line 923 has a planar shape and is made of metal. One end portion of each of the second conductive line 922 and the third conductive line 923 is connected to an end portion of the first conductive line 921, and the other end portion of each of the second conductive line 922 and the third conductive line 923 is placed in the vicinity of the dipole antenna element 201. That is, the second conductive line 922 and the third conductive line 923 are positioned such that their respective end portions are spatially coupled to the dipole antenna element 201.

[0079] A main surface of the first conductive line 921 is parallel to the mounting plate 203. Further, a main surface of each of the second conductive line 922 and the third conductive line 923 is parallel to the H-axis. The main surface of each of the second conductive line 922 and the third conductive line 923 is preferably perpendicular to the mounting plate 203.

[0080] The first conductive line 921 and the second conductive line 922 are connected to each other at a first end portion of the first conductive line 921 at an angle greater than 0 degrees and less than 180 degrees in the LW plane. The angle formed by the first conductive line 921 and the second conductive line 922 in the LW plane is preferably 90 degrees.

[0081] Further, the first conductive line 921 and the third conductive line 923 are connected to each other at a second end portion of the first conductive line 921 at an angle greater than 0 degrees and less than 180 degrees in the LW plane. The angle formed by the first conductive line 921 and the third conductive line 923 in the LW plane is preferably 90 degrees.

[0082] Further, the parasitic antenna element 902 is a parasitic antenna element that is not connected to a circuit of the mounting plate 203. Further, in the parasitic antenna element 902, the first conductive line 921 is placed parallel to one side of the mounting plate 203 at a position spaced apart from the mounting plate 203.

[0083] Among the three linear conductive lines, one end portion of each of the second conductive line 922 and the third conductive line 923 is connected to an end portion of the first conductive line 921, and the other end portion of each of the second conductive line 922 and the third conductive line 923 is placed in the vicinity of the dipole antenna element 201. That is, the second conductive line 922 and the third conductive line 923 are positioned such that their respective end portions are spatially coupled to the dipole antenna element 201. Further, the third conductive line 923 extends in a direction parallel to the direction in which the second conductive line 922 extends.

[0084] The parasitic antenna element 902 can be inserted into the mounting plate 203 and fixed.

[0085] Seventh Exemplary Embodiment

[0086] Figure 10is a perspective view showing a schematic configuration of an antenna device according to a seventh example embodiment. In Figure 10 The antenna device 1000 includes a dipole antenna element 201, a parasitic antenna element 1002, and a mounting plate 203 in Figure 10 The same members as those in Figure 2 will be omitted.

[0087] The parasitic antenna element 1002 includes three conductive lines of a first conductive line 1021, a second conductive line 1022, and a third conductive line 1023. Each of the first conductive line 1021, the second conductive line 1022, and the third conductive line 1023 has a planar shape and is made of metal. One end portion of each of the second conductive line 1022 and the third conductive line 1023 is connected to an end portion of the first conductive line 1021 and the other end portion of each of the second conductive line 1022 and the third conductive line 1023 is placed in the vicinity of the dipole antenna element 201. That is, the second conductive line 1022 and the third conductive line 1023 are positioned so that their respective end portions are spatially coupled to the dipole antenna element 201.

[0088] A main surface of the first conductive line 1021, a main surface of the second conductive line 1022, and a main surface of the third conductive line 1023 are each placed parallel to the mounting plate 203 and in the same plane as the mounting plate 203.

[0089] The first conductive line 1021 and the second conductive line 1022 are connected to each other at a first end portion of the first conductive line 1021 at an angle greater than 0 degrees and less than 180 degrees in the HW plane. The angle formed by the first conductive line 1021 and the second conductive line 1022 in the HW plane is preferably 90 degrees.

[0090] Further, the first conductive line 1021 and the third conductive line 1023 are connected to each other at a second end portion of the first conductive line 1021 at an angle greater than 0 degrees and less than 180 degrees in the HW plane. The angle formed by the first conductive line 1021 and the third conductive line 1023 in the HW plane is preferably 90 degrees.

[0091] Further, the parasitic antenna element 1002 is a parasitic antenna element that is not connected to a circuit of the mounting plate 203. Further, in the parasitic antenna element 1002, the first conductive line 1021 is placed parallel to one side of the mounting plate 203 and in the same plane as the mounting plate 203 at a position spaced apart from the mounting plate 203.

[0092] Among the three linear conductive wires, one end of each of the second conductive wire 1022 and the third conductive wire 1023 is connected to the end of the first conductive wire 1021 and the other end of each of the second conductive wire 1022 and the third conductive wire 1023 is placed in the vicinity of the dipole antenna element 201. That is, the second conductive wire 1022 and the third conductive wire 1023 are positioned such that their respective ends are spatially coupled to the dipole antenna element 201. Further, the third conductive wire 1023 extends in a direction parallel to the direction in which the second conductive wire 1022 extends.

[0093] The antenna device 1000 is advantageous when there is a margin in the height direction. Note that by making the shape of the parasitic antenna element 1002 similar to the shape of the parasitic antenna element 702 shown in FIG. 7, it is possible to further reduce the size of the parasitic antenna element 1002. Further, the circuit of the parasitic antenna element can be directly drawn on the member mounting plate of the product instead of being formed by a different metal. Figure 7

[0094] As described above, by using the non-contact parasitic antenna element according to the present application, it is possible to minimize the installation area of the radio device and obtain a desired gain in the sky direction at a low cost.

[0095] Note that the present application is not limited to the exemplary embodiments described above and can be appropriately changed without departing from the spirit of the present application. For example, while a dipole antenna is used in the antenna device according to the exemplary embodiments described above, a reverse L antenna or a reverse F antenna can be used instead. By removing the (-) element of the dipole, the antenna becomes a reverse L antenna in structure.

[0096] Further, the antenna device according to the exemplary embodiments described above aims to minimize the occupied area of the antenna and the parasitic antenna. For example, there are few products that are equipped with only a GPS radio system. Products are also equipped with other communication systems such as LTE, Wi-Fi, and LPWA. These are in order to enable information obtained by GPS to be transmitted to other systems via the cloud. In this case, it is important to design the antenna device so that it avoids interfering with the antennas of other systems, and maintaining a sufficient distance between the antennas is the most basic means for avoiding such interference. Therefore, it is desirable to complete the GPS antenna within its own area, and the antenna device according to the exemplary embodiments described above aims to reduce its size and achieve high performance.

[0097] While the present application has been described with reference to exemplary embodiments, the present application is not limited to the exemplary embodiments described above. Various changes that can be understood by those skilled in the art can be made to the configurations and details of the present application within the scope of the present application.

[0098] ​This application is based on and claims priority to Japanese Patent Application No. 2020-057192, filed March 27, 2020, the disclosure of which is incorporated herein in its entirety by reference.

[0099] List of Reference Signs

[0100] 100, 200, 600, 700, 800, 900, 1000 Antenna device

[0101] 101, 201 Dipole antenna element

[0102] 102, 202, 602, 702, 802, 902, 1002 Parasitic antenna element

[0103] 103, 203 Mounting plate

[0104] 121, 221, 621, 721, 821, 921, 1021 First conductor

[0105] 122, 222, 622, 722, 822, 922, 1022 Second conductor

[0106] 123, 223, 623, 723, 823, 923, 1023 Third conductor

[0107] 724 Fourth conductor

[0108] 725 Fifth conductor

[0109] 400 Dipole antenna device

[0110] 401 Dipole antenna element

[0111] 402 Mounting plate

Claims

1. An antenna device, comprising: a mounting board comprising circuitry configured to process radio signals; a dipole antenna element configured to receive the radio signal, the dipole antenna element being positioned in the mounting plate; and a parasitic element comprising a first conductor, a second conductor, and a third conductor, the first conductor being parallel to the dipole antenna element, the second conductor being connected to the first conductor at a first end thereof at an angle greater than 0 degrees and less than 180 degrees, and the third conductor being connected to the first conductor at a second end thereof at an angle greater than 0 degrees and less than 180 degrees, wherein at least an end of the second conductor is positioned closer to the dipole antenna element than the first conductor, and the end of the second conductor and an end of the dipole antenna element are formed to face each other. The extending direction of the third conductive line is perpendicular to the extending direction of the second conductive line.

2. The antenna device according to claim 1, wherein At least the end of the second conductive line is positioned to be spatially coupled to the dipole antenna element.

3. The antenna device according to claim 1, wherein The radio signal includes at least a positioning signal, The mounting plate includes circuitry configured to determine a position based on the positioning signal, and The dipole antenna element receives the positioning signal.

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