Antenna device

Abstract

To provide an antenna device which can ensure isolation between an antenna in a high frequency band and an antenna in a low frequency band, without increasing a mismatching loss of the antenna in the high frequency band even inside a limited space.SOLUTION: An antenna device 11 comprises: a radio part 20 which communicates in a high frequency band (FH); and a radio part 30 which communicates in a low frequency band (FL). The radio part 20 has: a higher band-side antenna 21, provided to face one surface of a conductor plate 24, which matches in a higher band (FH2) of the high frequency band (FH); and a lower band-side antenna 22, provided to face the other surface of the conductor plate 24, which matches in a lower band (FH1) of the high frequency band (FH). The radio part 30 has an antenna 31 which matches in the low frequency band. The higher band-side antenna 21, the lower band-side antenna 22, and the antenna 31 are aligned in the vertical direction.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to an antenna device. [Background technology]

[0002] Patent Document 1 discloses an antenna device that improves antenna efficiency over a wide band and allows easy setting of the target frequency band. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2003-318631 A Summary of the Invention [Problem to be solved by the invention]

[0004] Here, with the development of communication technology, there is an increasing demand for integrating new wireless systems into antenna housings that include existing wireless systems, which makes it possible to save space for installing antennas for the new wireless systems.

[0005] On the other hand, simply installing a wireless system in a limited space poses various problems. For example, the antenna device disclosed in Patent Document 1 is capable of matching over a wide band, but if an antenna that can match over a lower band exists near an antenna that can match over a wide band in a limited space, electromagnetic coupling between the antennas increases.

[0006] In order to ensure isolation near the low frequency band, it is effective to reduce the antenna size and increase the reflection in the low frequency band of a broadband antenna, but at the same time, there is a problem that mismatch loss increases in the low frequency band of a broadband antenna.

[0007] The present disclosure has been made to solve the above-mentioned problems, and aims to provide an antenna device that can ensure isolation between a high-frequency band antenna and a low-frequency band antenna in the high-frequency band without increasing the mismatch loss of the antennas, even in a limited space. [Means for solving the problem]

[0008] The antenna device according to the present disclosure is an antenna device including a first radio unit that communicates in a high frequency band and a second radio unit that communicates in a low frequency band, wherein the first radio unit has a high band side antenna that is arranged opposite one side of a conductor plate and matches at the high band of the high frequency band, and a low band side antenna that is arranged opposite the other side of the conductor plate and matches at the low band of the high frequency band, and the second radio unit has a low frequency band side antenna that matches at the low frequency band, and the high band side antenna, low band side antenna, and low frequency band side antenna are arranged vertically side by side. Effect of the Invention

[0009] According to the present disclosure, it is possible to ensure isolation between a high-frequency band antenna and a low-frequency band antenna even in a limited space, without increasing the mismatch loss of the antennas in the high-frequency band. [Brief description of the drawings]

[0010] [Figure 1] 1 is a vertical cross-sectional view of an antenna device according to a first embodiment. [Diagram 2] FIG. 11 is a vertical cross-sectional view of a conventional antenna device. [Diagram 3] 4 is a diagram showing frequency characteristics of VSWR (Voltage Standing Wave Ratio) in a range including a low frequency band (FL) in an antenna on the low frequency band side of the antenna device according to the first embodiment. FIG. [Figure 4] 4 is a diagram showing frequency characteristics of the amount of electromagnetic coupling between antennas in a range including a low frequency band (FL) in two radio units of the antenna device according to the first embodiment. FIG. [Diagram 5]1 is a diagram showing frequency characteristics of VSWR (voltage standing wave ratio) in a range including a low frequency band (FL) and a low band (FH1) of a high frequency band (FH) in an antenna on the low frequency band side of the antenna device according to the first embodiment. FIG. [Figure 6] 11 is a vertical cross-sectional view of an antenna device according to a second embodiment. FIG. [Figure 7] 1 is a vertical cross-sectional view of an antenna device according to a first comparative example. [Figure 8] 11 is a vertical cross-sectional view of an antenna device according to a second comparative example. FIG. [Figure 9] 13 is a diagram showing frequency characteristics of VSWR (Voltage Standing Wave Ratio) in a range including a low band (FH1) of a high frequency band (FH) in a low band side antenna of an antenna device according to a second embodiment. FIG. [Figure 10] FIG. 11 is a diagram showing frequency characteristics of the amount of electromagnetic coupling between antennas in a range including a low frequency band (FL) in two radio units of an antenna device according to a second embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings.

[0012] Embodiment 1 An antenna device 11 according to the first embodiment will be described with reference to FIGS. 1 to 4. FIG.

[0013] First, the configuration of an antenna device 11 according to the first embodiment will be described with reference to Fig. 1. Fig. 1 is a vertical cross-sectional view of the antenna device 11 according to the first embodiment.

[0014] As shown in Fig. 1, antenna device 11 according to the first embodiment includes radio section 20 and radio section 30. Radio sections 20 and 30 are arranged side by side in the height direction of antenna device 11. Radio section 20 is arranged above radio section 30. Radio section 20 constitutes a first radio section, and radio section 30 constitutes a second radio section.

[0015] The radio unit 20 is a radio system having a high frequency band (FH) which is a predetermined frequency band. In the high frequency band (FH), the radio unit 20 defines a low frequency band as a low band (FH1) and a frequency band higher than the low band (FH1) as a high band (FH2).

[0016] The radio section 20 includes a high band side antenna 21, a low band side antenna 22, a dielectric substrate 23, a conductor plate 24, a power feed section 25, and a branch section .

[0017] The dielectric substrate 23 is placed vertically along the up-down direction. One surface and the other surface of the dielectric substrate 23 are substantially vertical surfaces. The high band side antenna 21 and the low band side antenna 22 are provided, for example, on the surface of the dielectric substrate 23. The high band side antenna 21 is disposed at a higher position than the low band side antenna 22. One surface of the dielectric substrate 23 is the front surface or the back surface, and the other surface of the dielectric substrate 23 is the back surface or the front surface. The one surface and the other surface are surfaces located opposite each other.

[0018] The high band side antenna 21 is formed, for example, of a copper foil pattern on the surface of the dielectric substrate 23. This high band side antenna 21 is an antenna that matches with the high band (FH2) of the high frequency band (FH) of the radio section 20. The high band side antenna 21 is, for example, a monopole antenna.

[0019] The low-band-side antenna 22 is formed, for example, of a copper foil pattern on the surface of the dielectric substrate 23. The low-band-side antenna 22 is an antenna that matches with the low band (FH1) of the high-frequency band (FH) that the radio unit 20 has.

[0020] The conductor plate 24 is, for example, a flat plate member formed of a metal material. The conductor plate 24 is provided substantially perpendicular to the surface of the dielectric substrate 23 and disposed substantially horizontally. The conductor plate 24 is electrically connected to the dielectric substrate 23. The conductor plate 24 serves as a ground plate for the high band side antenna 21 and the low band side antenna 22. The high band side antenna 21 is provided facing the upper surface, which is one surface of the conductor plate 24. The low band side antenna 22 is provided facing the lower surface, which is the other surface of the conductor plate 24. The one surface and the other surface are surfaces located opposite each other.

[0021] The conductive plate 24 also has a through hole 24a. The through hole 24a is a hole that penetrates the conductive plate 24 in the thickness direction (vertical direction).

[0022] The power supply unit 25 supplies power to the high band side antenna 21 and the low band side antenna 22. Power for operating the high band side antenna 21 and the low band side antenna 22 is supplied to the power supply unit 25. The power supply unit 25 is provided between the lower end of the high band side antenna 21 and the upper surface of the conductor plate 24, and is electrically connected thereto.

[0023] The branching section 26 distributes the power supplied to the high band side antenna 21 from the high band side antenna 21 to the low band side antenna 22. The branching section 26 electrically connects the lower end of the high band side antenna 21 and the upper end of the low band side antenna 22. In this case, the branching section 26 is provided so as to pass through the through hole 24a of the conductor plate 24. The branching section 26 may be formed on the surface of the dielectric substrate 23.

[0024] The radio unit 30 is a radio system having a low frequency band (FL) which is a predetermined frequency band. The low frequency band (FL) of the radio unit 30 is a frequency band lower than the high frequency band (FH) of the radio unit 20.

[0025] The radio section 30 has a low-frequency band antenna 31, a dielectric substrate 32, a conductor plate 33, and a power feed section 34. The antenna 31 constitutes a low-frequency band antenna.

[0026] The dielectric substrate 32 is placed vertically along the up-down direction. One surface and the other surface of the dielectric substrate 32 are substantially vertical. The antenna 31 is provided, for example, on the surface of the dielectric substrate 32. The dielectric substrate 32 is disposed below the dielectric substrate 23. Therefore, the antenna 31 is disposed at a lower position than the high band side antenna 21 and the low band side antenna 22. Moreover, the low band side antenna 22 and the antenna 31 are adjacent to each other in the vertical direction.

[0027] The antenna 31 is formed, for example, of a copper foil pattern on the surface of a dielectric substrate 32. The antenna 31 is an antenna that matches with a low frequency band (FL) that is lower than the high frequency band (FH) of the wireless unit 20.

[0028] The conductor plate 33 is, for example, a flat plate member formed of a metal material. The conductor plate 33 is provided substantially perpendicular to the surface of the dielectric substrate 32 and disposed substantially horizontally. The conductor plate 33 is electrically connected to the dielectric substrate 32. The conductor plate 33 serves as a ground plate for the antenna 31. The antenna 31 is provided facing the upper surface, which is one of the surfaces of the conductor plate 33.

[0029] The power supply unit 34 supplies power to the antenna 31. Power is supplied to the power supply unit 34 for operating the antenna 31. The power supply unit 34 is provided between the lower end of the antenna 31 and the upper surface of the conductor plate 33, and is electrically connected thereto.

[0030] As described above, the antenna device 11 according to the first embodiment includes the radio unit 20 that communicates in the high frequency band (FH) and the radio unit 30 that communicates in the low frequency band (FL). Moreover, the antenna device 11 divides the radio unit 20 that communicates in the high frequency band (FH) into the high band side antenna 21 and the low band side antenna 22, while the radio unit 30 includes the antenna 31 that communicates in the low frequency band (FL). Furthermore, the antenna device 11 arranges the high band side antenna 21, the low band side antenna 22, and the antenna 31 in order in the vertical direction, that is, from the high side to the low side in the height direction.

[0031] In this case, the antenna element of the high band side antenna 21 is designed to be close to total reflection in the high frequency band (FH). Therefore, the electromagnetic coupling of the antenna 31 is suppressed in the low frequency band (FL). As a result, the high band side antenna 21 and the low band side antenna 22 can ensure isolation from the antenna 31.

[0032] Therefore, the antenna device 11 can suppress mismatch loss of the antennas 21, 22 in the high frequency band (FH), and can increase isolation between the high frequency band antenna 21 and the low frequency band antenna 22 in the high frequency band (FH) and the low frequency band antenna 31. Furthermore, the antenna device 11 can be made smaller in size because its height can be kept low.

[0033] For example, even in a limited volume such as the inside of a cylinder with a diameter of 1.3 wavelengths and a height of approximately 2.5 wavelengths, the antenna device 11 can suppress electromagnetic coupling between multiple wireless systems and ensure isolation in the desired frequency bands of the wireless systems without increasing antenna mismatch loss.

[0034] Next, the effects of the antenna device 11 according to the first embodiment will be described with reference to FIGS. 2 to 5 while comparing it with the conventional antenna device 15. FIG.

[0035] Fig. 2 is a vertical cross-sectional view of a conventional antenna device 15. As shown in Fig. 2, the conventional antenna device 15 has a configuration in which a conventional wideband antenna 51 is provided above a low-frequency band antenna 31. The conventional antenna device 15 has the low-frequency band antenna 31, a dielectric substrate 32, a conductor plate 33, a power feed section 34, the wideband antenna 51, and a power feed section 52.

[0036] In the conventional antenna device 15, the dielectric substrate 32 is provided over the entire vertical area. The wideband antenna 51 is provided so as to contact the upper part of the antenna 31. The wideband antenna 51 is formed, for example, of a copper foil pattern on the surface of the dielectric substrate 32. The power supply unit 52 supplies power to the wideband antenna 51. Power for operating the wideband antenna 51 is supplied to the power supply unit 52. The power supply unit 52 is electrically connected to the lower end of the wideband antenna 51.

[0037] Fig. 3 is a diagram showing frequency characteristics of VSWR (Voltage Standing Wave Ratio) in a range including the low frequency band (FL) for antenna 31 on the low frequency band side of antenna device 11 according to embodiment 1. The solid line shown in Fig. 3 indicates the frequency characteristics of VSWR of antenna 31 in radio unit 30. Moreover, the dotted line shown in Fig. 3 indicates the frequency characteristics of VSWR of antenna 31 in conventional antenna device 15.

[0038] Fig. 4 is a diagram showing frequency characteristics of the amount of electromagnetic coupling between antennas in a range including the low frequency band (FL) in two radio units 20 and 30 of antenna device 11 according to embodiment 1. The solid line shown in Fig. 4 indicates the frequency characteristics of the amount of electromagnetic coupling between antennas 21, 22 and antenna 31. Moreover, the dotted line shown in Fig. 4 indicates the frequency characteristics of the amount of electromagnetic coupling between wideband antenna 51 and antenna 31.

[0039] Fig. 5 is a diagram showing frequency characteristics of VSWR (Voltage Standing Wave Ratio) in a range including the low frequency band (FL) and the low band (FH1) of the high frequency band (FH) in the antenna 31 on the low frequency band side of the antenna device 11 according to the first embodiment. The solid line shown in Fig. 5 indicates the frequency characteristics of the VSWR of the antenna 31 in the radio unit 30. The dotted line shown in Fig. 5 indicates the frequency characteristics of the VSWR of the antenna 31 in the conventional antenna device 15.

[0040] 3, the VSWR of the antenna 31 of the radio unit 30 is a small value in the low frequency band (FL), and the antenna 31 is not matched in the low frequency band (FL). Also, the VSWR of the antenna 31 of the conventional antenna device 15 is a small value in the low frequency band (FL), and the antenna 31 is not matched in the low frequency band (FL).

[0041] 4, in the low frequency band (FL), the amount of electromagnetic coupling between the antennas 21, 22 and the antenna 31 is greater than the amount of electromagnetic coupling between the wideband antenna 51 and the antenna 31. For this reason, the antenna device 11 is unable to ensure isolation.

[0042] Therefore, as shown in Fig. 1, antenna device 11 according to the first embodiment divides radio section 20, which communicates in the high frequency band (FH), into high frequency band antenna 21 and low frequency band antenna 22, while radio section 30 has antenna 31, which communicates in the low frequency band (FL), and the antenna element of high frequency band antenna 21 is designed so that it is close to total reflection in the high frequency band (FH). Therefore, as shown in Fig. 5, antenna device 11 can ensure isolation at power feed section 34 of antenna 31 while achieving matching in the low frequency band (FH1).

[0043] As described above, the antenna device 11 according to the first embodiment includes a radio unit 20 that communicates in a high frequency band (FH) and a radio unit 30 that communicates in a low frequency band (FL). The radio unit 20 has a high frequency side antenna 21 that is provided opposite to the upper surface of the conductor plate 24 and matches in the high frequency band (FH2) of the high frequency band (FH), and a low frequency side antenna 22 that is provided opposite to the lower surface of the conductor plate 24 and matches in the low frequency band (FH1) of the high frequency band (FH). The radio unit 30 has an antenna 31 that matches in the low frequency band. The high frequency side antenna 21, the low frequency side antenna 22, and the antenna 31 are arranged in a vertical line. Therefore, the antenna device 11 can ensure isolation between the antennas 21 and 22 of the high frequency band (FH) and the antenna 31 of the low frequency band without increasing the mismatch loss of the antennas 21 and 22 in the high frequency band (FH) even in a limited space.

[0044] Embodiment 2 An antenna device 12 according to the second embodiment will be described with reference to Fig. 6 to Fig. 10. Note that components having the same functions as those described in the first embodiment above are given the same reference numerals, and the description thereof will be omitted.

[0045] Fig. 6 is a vertical cross-sectional view of antenna device 12 according to embodiment 2. As shown in Fig. 6, antenna device 12 according to embodiment 2 includes a radio unit 20A instead of radio unit 20 of antenna device 11 according to embodiment 1 shown in Fig. 1. Radio unit 20A constitutes a first radio unit.

[0046] The radio section 20A has a structure in which the high band side antenna 21, the low band side antenna 22, the dielectric substrate 23, the conductor plate 24, the power supply section 25, and the branch section 26 are rotated 180 degrees in the vertical plane with respect to the structure of the radio section 20, that is, the structure is upside down. Therefore, the high band side antenna 21 is provided facing the lower surface, which is one surface of the conductor plate 24. The low band side antenna 22 is provided facing the upper surface, which is the other surface of the conductor plate 24. The high band side antenna 21 and the antenna 31 are also disposed adjacent to each other in the vertical direction.

[0047] Fig. 7 is a vertical cross-sectional view of antenna device 13 serving as a first comparative example. As shown in Fig. 7, antenna device 13 includes a radio unit 40A instead of radio unit 20 of antenna device 11 according to embodiment 1. Radio unit 40A constitutes a first radio unit.

[0048] The radio section 40A has a structure in which the high band side antenna 21, the low band side antenna 22, the power supply section 25, and the branch section 26 are arranged above the conductor plate 24. The high band side antenna 21 is provided on the front surface of the dielectric substrate 23. On the other hand, the low band side antenna 22 is provided on the back surface of the dielectric substrate 23. The power supply section 25 is electrically connected to the lower end of the high band side antenna 21. The power supply section 25 is also electrically connected to the lower end of the low band side antenna 22 via the branch section 26. At this time, the branch section 26 penetrates the dielectric substrate 23 in the thickness direction.

[0049] Fig. 8 is a vertical cross-sectional view of antenna device 14 serving as a second comparative example. As shown in Fig. 8, antenna device 14 includes a radio unit 40B instead of radio unit 20 of antenna device 11 according to embodiment 1. Radio unit 40B constitutes a first radio unit.

[0050] The radio section 40A has a structure in which the high band side antenna 21, the low band side antenna 22, the power supply section 25, and the branch section 26 are arranged below the conductor plate 24. The high band side antenna 21 is provided on the front surface of the dielectric substrate 23. On the other hand, the low band side antenna 22 is provided on the back surface of the dielectric substrate 23. The power supply section 25 is electrically connected to the upper end of the high band side antenna 21. The power supply section 25 is also electrically connected to the upper end of the low band side antenna 22 via the branch section 26. At this time, the branch section 26 penetrates the dielectric substrate 23 in the thickness direction.

[0051] Fig. 9 is a diagram showing the frequency characteristics of VSWR (Voltage Standing Wave Ratio) in a range including the low band (FH1) of the high frequency band (FH) in the low band antenna 22 of the antenna device 12 according to the second embodiment. The solid line shown in Fig. 9 indicates the frequency characteristics of VSWR of the low band antenna 22 in the radio unit 20. The dashed line shown in Fig. 9 indicates the frequency characteristics of VSWR of the low band antenna 22 in the radio unit 20A. The dotted line shown in Fig. 9 indicates the frequency characteristics of VSWR of the low band antenna 22 in the radio unit 40A. The dashed line shown in Fig. 9 indicates the frequency characteristics of VSWR of the low band antenna 22 in the radio unit 40B.

[0052] Fig. 10 is a diagram showing frequency characteristics of the amount of electromagnetic coupling between antennas in a range including the low frequency band (FL) in two radio units 20A and 30 of the antenna device 12 according to the second embodiment. The solid line shown in Fig. 10 indicates the frequency characteristics of the amount of electromagnetic coupling between the antennas 21 and 22 and the antenna 31 in the antenna device 11. The dashed line shown in Fig. 10 indicates the frequency characteristics of the amount of electromagnetic coupling between the antennas 21 and 22 and the antenna 31 in the antenna device 12. The dotted line shown in Fig. 10 indicates the frequency characteristics of the amount of electromagnetic coupling between the antennas 21 and 22 and the antenna 31 in the antenna device 13. The dashed line shown in Fig. 10 indicates the frequency characteristics of the amount of electromagnetic coupling between the antennas 21 and 22 and the antenna 31 in the antenna device 14.

[0053] 9, the antenna devices 13 and 14 are not matched in the low band (FH1) of the high frequency band (FH). In contrast, the antenna devices 11 and 12 are matched to the same extent in the low band (FH1) of the high frequency band (FH).

[0054] 10, in the low frequency band (FL), the electromagnetic coupling amount of antenna device 12 is worse than that of antenna device 11 by up to about 4 dB. However, the electromagnetic coupling amount of antenna device 12 is improved by about 2 dB than that of antenna device 15 shown in Fig. 4. Therefore, in antenna device 12, it is possible to suppress mismatch loss and ensure isolation.

[0055] As described above, the antenna device 12 according to the second embodiment includes a radio unit 20A that communicates in a high frequency band (FH) and a radio unit 30 that communicates in a low frequency band (FL). The radio unit 20A has a high frequency side antenna 21 that is provided facing the lower surface of the conductor plate 24 and matches in the high frequency band (FH2) of the high frequency band (FH), and a low frequency side antenna 22 that is provided facing the upper surface of the conductor plate 24 and matches in the low frequency band (FH1) of the high frequency band (FH). The radio unit 30 has an antenna 31 that matches in the low frequency band. The high frequency side antenna 21, the low frequency side antenna 22, and the antenna 31 are arranged in a vertical line. Therefore, the antenna device 12 can ensure isolation between the antennas 21 and 22 of the high frequency band (FH) and the antenna 31 of the low frequency band without increasing the mismatch loss of the antennas 21 and 22 in the high frequency band (FH) even in a limited space.

[0056] Embodiment 3 In the antenna device 11 according to the first embodiment, the high band side antenna 21 is a monopole antenna. The high band side antenna 21 may be an inverted-F antenna, an inverted-L antenna, or a capacitance-loaded monopole antenna. In this way, when the high band side antenna 21 is an inverted-F antenna, an inverted-L antenna, or a capacitance-loaded monopole antenna, the radio unit 20 is more likely to perform total reflection in the low frequency band (FL) than when the high band side antenna 21 is a monopole antenna.

[0057] Embodiment 4 In the antenna device 11 according to the first embodiment, the antenna type of the antenna 31 on the low frequency band side is not limited. This antenna 31 may be a monopole antenna. In this way, when the antenna 31 is a monopole antenna, the radio unit 30 can achieve a low profile while being compatible with the low frequency band (FL).

[0058] Embodiment 5. Antenna 31 may be a capacitance-loaded monopole antenna. In this way, when antenna 31 is a capacitance-loaded monopole antenna, radio unit 30 can reduce the area of ​​the copper foil pattern for forming antenna 31 on dielectric substrate 32. Therefore, radio unit 30 can have a low profile.

[0059] Embodiment 6 When the high band side antenna 21 is a monopole antenna as in the antenna device 11 of the first embodiment, the height from the conductor plate 24 to the upper end of the high band side antenna 21 is 0.15 wavelengths or less. When the height of the high band side antenna 21, which is a monopole antenna, is 0.15 wavelengths or less, the amount of electromagnetic coupling between the radio unit 20 and the radio unit 30 is reduced compared to when an antenna having the same antenna shape and a height of 0.25 wavelengths is provided.

[0060] Embodiment 7 In the radio section 20 of the antenna device 11 of the first embodiment, the high band side antenna 21 and the low band side antenna 22 are provided on one surface of the dielectric substrate 23, but the high band side antenna 21 may be provided on one surface of the dielectric substrate 23, while the low band side antenna 22 may be provided on the other surface of the dielectric substrate 23. In this case, the amount of electromagnetic coupling between the high band side antenna 21 and the antenna 31 and the amount of electromagnetic coupling between the low band side antenna 22 and the antenna 31 are suppressed.

[0061] In addition, within the scope of the present disclosure, the embodiments may be freely combined, or any of the components in each embodiment may be modified, or any of the components in each embodiment may be omitted.

[0062] Various aspects of the present disclosure are summarized below as appendices.

[0063] (Appendix 1) An antenna device including a first wireless unit that communicates in a high frequency band and a second wireless unit that communicates in a low frequency band, The first wireless unit is a high-frequency band antenna that is provided opposite to one surface of the conductor plate and that is matched in a high frequency band; a low-band antenna provided opposite to the other surface of the conductor plate and adapted to match in a low band of a high-frequency band; The second radio unit has a low-frequency band side antenna that is matched in a low-frequency band, The high-band-side antenna, the low-band-side antenna, and the low-frequency-band-side antenna are arranged in a vertical direction. 1. An antenna device comprising:

[0064] (Appendix 2) the first wireless unit has a dielectric substrate arranged along a vertical direction, The high band side antenna and the low band side antenna are provided on one surface of the dielectric substrate. 2. The antenna device according to claim 1 .

[0065] (Appendix 3) the first wireless unit has a dielectric substrate arranged along a vertical direction, the high band side antenna is provided on one surface of the dielectric substrate, The low band antenna is provided on the other surface of the dielectric substrate. 2. The antenna device according to claim 1 .

[0066] (Appendix 4) The low band side antenna and the low frequency band side antenna are disposed adjacent to each other in the vertical direction. 4. The antenna device according to claim 1, wherein the first and second electrodes are arranged in a first direction.

[0067] (Appendix 5) The high frequency band side antenna and the low frequency band side antenna are disposed adjacent to each other in the vertical direction. 4. The antenna device according to claim 1, wherein the first and second electrodes are arranged in a first direction.

[0068] (Appendix 6) a power supply section electrically connected between the high band side antenna and the conductor plate and supplying power to the high band side antenna and the low band side antenna; a branching section that branches from the high band side antenna to the low band side antenna and distributes the power supplied to the power supply section from the high band side antenna to the low band side antenna. 6. The antenna device according to claim 1,

[0069] (Appendix 7) The branch portion penetrates the conductive plate. 7. The antenna device according to claim 6.

[0070] (Appendix 8) The high-band antenna is any one of a monopole antenna, an inverted F antenna, an inverted L antenna, and a capacitance-loaded monopole antenna. 8. The antenna device according to claim 1, wherein the antenna device is a

[0071] (Appendix 9) The low frequency band side antenna is a monopole antenna. 9. The antenna device according to claim 1,

[0072] (Appendix 10) The low frequency band side antenna is a capacitance-loaded monopole antenna. 10. The antenna device according to claim 9.

[0073] (Appendix 11) The height from the conductor plate to the upper end of the high band antenna is 0.15 wavelengths or less. 11. The antenna device according to claim 1, [Explanation of symbols]

[0074] 11-15 Antenna device, 20, 20A Radio unit, 21 High band side antenna, 22 Low band side antenna, 23 Dielectric substrate, 24 Conductor plate, 24a Through hole, 25 Power supply unit, 26 Branching unit, 30 Radio unit, 31 Antenna, 32 Dielectric substrate, 33 Conductor plate, 34 Power supply unit, 40A, 40B Radio unit, 51 Wide band antenna, 52 Power supply unit.

Claims

1. An antenna device including a first wireless unit that communicates in a high frequency band and a second wireless unit that communicates in a low frequency band, The first wireless unit, a high-frequency band antenna that is provided opposite to one surface of the conductor plate and that is matched in a high frequency band; a low-band antenna provided opposite to the other surface of the conductor plate and adapted to match in a low band of a high-frequency band; the second radio unit has a low-frequency band side antenna that is matched in a low-frequency band, The high-band-side antenna, the low-band-side antenna, and the low-frequency-band-side antenna are arranged in a vertical direction.

1. An antenna device comprising:

2. the first wireless unit has a dielectric substrate arranged along a vertical direction, The high band side antenna and the low band side antenna are provided on one surface of the dielectric substrate.

2. The antenna device according to claim 1.

3. the first wireless unit has a dielectric substrate arranged along a vertical direction, the high band side antenna is provided on one surface of the dielectric substrate, The low band antenna is provided on the other surface of the dielectric substrate.

2. The antenna device according to claim 1.

4. The low band side antenna and the low frequency band side antenna are disposed adjacent to each other in the vertical direction.

2. The antenna device according to claim 1.

5. The high frequency band side antenna and the low frequency band side antenna are disposed adjacent to each other in the vertical direction.

2. The antenna device according to claim 1.

6. a power supply section electrically connected between the high band side antenna and the conductor plate and supplying power to the high band side antenna and the low band side antenna; a branching section that branches from the high band side antenna to the low band side antenna and distributes the power supplied to the power supply section from the high band side antenna to the low band side antenna.

2. The antenna device according to claim 1.

7. The branch portion penetrates the conductive plate.

7. The antenna device according to claim 6.

8. The high-band antenna is any one of a monopole antenna, an inverted F antenna, an inverted L antenna, and a capacitance-loaded monopole antenna.

2. The antenna device according to claim 1.

9. The low frequency band side antenna is a monopole antenna.

2. The antenna device according to claim 1.

10. The low frequency band side antenna is a capacitance-loaded monopole antenna.

10. The antenna device according to claim 9.

11. The height from the conductor plate to the upper end of the high band antenna is equal to or less than 0.15 wavelengths.

2. The antenna device according to claim 1.

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