ANTENNA DEVICE

Abstract

Antenna device (4), comprising: a first antenna (41); a second antenna (42); a third antenna (43), a fourth antenna (44), a second base plate (40b) to which the first antenna (41) is connected via a first power injection point (45); and a first base plate (40a) to which the second antenna (42) is connected via a second power feed point (46); wherein the second antenna (42) is provided on the same side as the first antenna (41) with respect to the second base plate (40b), wherein the second base plate (40b) and the first base plate (40a) are provided essentially parallel to each other and are in a state in which the second base plate (40b) and the first base plate (40a) are separate base plates, wherein the third antenna (43) is connected to the second base plate (40b) via a third power injection point (47) and the fourth antenna (44) is connected to the first base plate (40a) via a fourth power injection point (48), and wherein the third antenna (43) and the fourth antenna (44) are provided on one side of the second base plate (40b) and the first base plate (40a) opposite one side of the first antenna (41) and the second antenna (42), and wherein the third antenna (43) is an antenna to be connected to a corner part of the second base plate (40b), and the second antenna (42) is an antenna to be connected to a corner part of the first base plate (40a), the corner part of the first base plate (40a) being positioned diagonally to the corner part of the second base plate (40b).

Description

Technical field

[0001] The present disclosure relates to an antenna device. Technical background

[0002] Traditionally, a technique known to improve communication speeds in radio systems is multiple input multiple output (MIMO) to carry out communication using a large number of antennas.

[0003] For example, patent specification (hereinafter referred to as “PTL”) 1 discloses a MIMO antenna device comprising a rectangular plate, two inverted F-antennas arranged on one short side of the plate, and two slotted monopole antennas each arranged on both long sides of the plate.

[0004] PTL 2 describes a modified inverted F-antenna for wireless communication. The antenna circuit comprises a dielectric substrate with a first surface, a radiating stub line on the first surface of the dielectric substrate, and a first ground plate on the first surface of the dielectric substrate for grounding. The first ground plate contains one or more grounded capacitive stub lines spaced apart from the radiating stub line. The one or more grounded capacitive stub lines tune the performance parameters of the antenna circuit. List of quotations Patent literature PTL 1 Japanese Patent Publication No. 2010-130115 PTL 2 US 2007 / 0229366 A1 Summary of the invention; Technical task

[0005] However, with the antenna device disclosed in PTL 1, since a large number of antennas are arranged on a surface of the same plate, there is a possibility that the antenna efficiency may decrease due to mutual coupling between the antennas and that the correlation coefficient cannot be made smaller.

[0006] To prevent the above-mentioned situation from occurring, it is possible, for example, to increase the size of the plate, but a larger plate results in a larger antenna device, which makes it difficult to reduce the size of the device.

[0007] One objective of the present disclosure is to create an antenna device that can be miniaturized while preventing a degradation in performance. Solution to the task

[0008] An antenna device according to one aspect of the present disclosure is an antenna device according to one of claims 1, 7 and 11. Advantageous effects of the invention

[0009] According to the present disclosure, it is possible to provide an antenna device that can be miniaturized while preventing a degradation in performance. Brief description of the drawing Fig. Figure 1A is a graphic representation showing an example of the construction of an antenna device with a base plate; Fig. Figure 1B is a graphic representation showing an example of the construction of an antenna device with two base plates; Fig. 2A is a graphical representation showing a relationship between the distance between two base plates and the correlation coefficient between antennas; Fig. Figure 2B is a graphical representation showing a relationship between the distance between the two base plates and the antenna efficiency of a first antenna; Fig. 2C is a graphical representation that shows a relationship between the distance between two base plates and the antenna efficiency of a second antenna; Fig. Figure 3 is a graphical representation that describes a relationship between the distance between two base plates and the performance improvement; Fig. 4A is a graphic representation showing an example of the construction of an antenna device in a case where the number of antennas is four; Fig. Figure 4B is a graphical representation showing another example of the antenna setup in a case where the number of antennas is four; and Fig. Figure 5 is a graphic representation showing an example of the construction of an antenna device in which no recess is provided in a second base plate in a case where the first base plate and the second base plate are present. Description of embodiments

[0010] An embodiment of the present disclosure is described in detail below with reference to the accompanying drawing.

[0011] Fig. Figure 1A is a graphic representation showing an example of the construction of the antenna device 1 with a base plate, and Fig. Figure 1B is a graphic representation showing an example of the construction of the antenna device 2 with two base plates according to the present embodiment.

[0012] The in Fig. The antenna device 1 shown in Figure 1A contains the base plate 10, the first antenna 11 and the second antenna 12.

[0013] The first antenna 11 is an inverted L-antenna and contains the first element 11a, which extends perpendicular to the base plate 10 in a rectangular shape, and the second element 11b, which extends along a long side of the base plate 10.

[0014] The first antenna 11 is connected to a corner part of the base plate 10 via a first power feed point 13.

[0015] The second antenna 12 is also an inverted L-antenna and contains the third element 12a, which extends perpendicular to the base plate 10 on the same side as the first element 11a of the first antenna 11, and the fourth element 12b, which extends along the long side of the base plate 10.

[0016] Furthermore, the second antenna 12 is connected via a second power feed point 14 to a corner part of the base plate 10, which is positioned diagonally to the corner part where the first power feed point 13 is located.

[0017] The direction in which the fourth element 12b of the second antenna 12 extends from the third element 12a is opposite to the direction in which the second element 11b of the first antenna 11 extends from the first element 11a.

[0018] The second element 11b of the first antenna 11 is designed so that, as seen from the base plate 10, it is positioned at the same height as the fourth element 12b of the second antenna 12.

[0019] Meanwhile, the one in Fig. 1B Antenna device 2 according to the present embodiment comprises a first base plate 20a, a second base plate 20b, a first antenna 21 and a second antenna 22.

[0020] Here, the first base plate 20a and the second base plate 20b are arranged parallel to each other. It should be noted that having the first base plate 20a and the second base plate 20b exactly parallel to each other is not necessarily required to achieve the effects of the operation described in this disclosure, and obviously a certain deviation can be tolerated.

[0021] This means that it is sufficient if the first base plate 20a and the second base plate 20b are essentially parallel to each other. In other words, this means that the first base plate 20a and the second base plate 20b extend in essentially the same direction. Furthermore, the shapes of the first base plate 20a and the second base plate 20b do not need to be shapes that completely overlap.

[0022] The first antenna 21 is an inverted L-antenna and contains the first element 21a, which extends perpendicular to the first base plate 20a in a rectangular shape, and the second element 21b, which extends along one long side of the first base plate 20a.

[0023] Furthermore, the first antenna 21 is connected to a corner part of the first base plate 20a via the first power feed point 23.

[0024] Here, a recess is formed in the second base plate 20b to achieve a reduction in the size of the antenna device 2 by extending the first element 21a perpendicular to the first base plate 20a without causing the first element 21a to protrude outwards.

[0025] The second antenna 22 is also an inverted L-antenna and contains the third element 22a, which extends perpendicular to the first base plate 20a on the same side as the first element 21a of the first antenna 21, and the fourth element 22b, which extends along one long side of the second base plate 20b.

[0026] The second antenna 22 is connected via the second power feed point 24 to a corner part of the second base plate 20b, which is positioned diagonally to a corner part of the first base plate 20a, where the first power feed point 23 is located.

[0027] The direction in which the fourth element 22b of the second antenna 22 extends from the third element 22a is essentially opposite to the direction in which the second element 21b of the first antenna 21 extends from the first element 21a.

[0028] The second element 21b of the first antenna 21 is designed such that, as seen from the second base plate 20b, it is positioned at the same height as the fourth element 22b of the second antenna 22.

[0029] In the Fig. In the antenna device shown in Figure 1A, the two antennas (first antenna 11 and second antenna 12) are provided on a base plate 10, which causes antenna coupling to occur, thus reducing the antenna efficiency and increasing the correlation coefficients.

[0030] To prevent the above-mentioned situation, it is possible to increase the size of the base plate 10, but a larger base plate 10 makes it difficult to reduce the size of the antenna device 1.

[0031] Meanwhile, in the Fig. In the antenna device 2 shown in Figure 1B, a structure is used in which the first antenna 21 and the second antenna 22 are connected to the two base plates (first base plate 20a and second base plate 20b), which are parallel to each other, via a first current feed point 23 and a second current feed point 24, respectively.

[0032] This design allows for miniaturization while preventing a deterioration in antenna performance. The antenna performance of antenna device 2 according to the present embodiment is described below.

[0033] Fig. 2A is a graphical representation showing a relationship between the distance between the two base plates and the correlation coefficient between the antennas. Fig. Figure 2B is a graphical representation showing a relationship between the distance between the two base plates and the antenna efficiency of the first antenna 21. Fig. 2C is a graphical representation showing a relationship between the distance between the two base plates and the antenna efficiency of the second antenna 22.

[0034] Fig. 2A, Fig. 2B and Fig. Figure 2C shows simulation results of correlation coefficients or antenna efficiency with respect to the distances between the base plates (horizontal axis, in millimeters). The simulations were performed for a variety of frequencies (700, 750, 800, 850, 900 and 950 MHz), and the Fig. 2A, Fig. 2B and Fig. Figure 2C shows the change in the values ​​of the correlation coefficients or the antenna efficiency between the antennas with respect to the distance between the base plates for each frequency, and furthermore, their mean values ​​are shown.

[0035] Here, 0 mm on the horizontal axis indicates that a base plate is used. Furthermore, the scale to 0 mm on the horizontal axis represents the distance between two base plates, and the distance between the first base plate 20a and the second base plate 20b, which are shown in Fig. As shown in 1B, it increases by 2mm.

[0036] As in Fig. As shown in Figure 2A, the correlation coefficient between the antennas decreases relative to the mean values ​​of the correlation coefficient as the distance between the two base plates increases. In other words, the correlation coefficient between the antennas tends to improve as the distance between the two base plates increases.

[0037] As in Fig. As shown in Figure 2B, the antenna efficiency of the first antenna increases with respect to the mean antenna efficiency values ​​as the distance between the two base plates increases. That is, one can say that the antenna efficiency of the first antenna 11 tends to improve as the distance between the two base plates increases.

[0038] Furthermore, one can say how in Fig. Figure 2C shows that the antenna efficiency of the second antenna 12 is essentially the same, or even better, than in the case of a base plate when the distance between the two base plates is up to 12 mm, and the antenna efficiency tends to improve when the distance between the base plates is at least up to 12 mm.

[0039] As described above, the reason for the performance improvement of the in Fig. 1B antenna device 2, that, because the antennas are each arranged on two base plates which are provided parallel to each other, as in Fig. Figure 1B shows the symmetry of the current distributions and radiation patterns of antenna device 2 compared to the symmetry of the current distributions and radiation patterns of the antenna device 2. Fig. The antenna device 1 shown in 1A is interrupted.

[0040] Next, a relationship is described between the distance between the first base plate 20a and the second base plate 20b and the performance improvement in the Fig. Antenna device shown in Figure 1B.

[0041] Fig. Figure 3 is a graphical representation showing the relationship between the distance between the first base plate 20a and the second base plate 20b and the performance improvement in the antenna device 2.

[0042] Fig. Figure 3 shows the results of simulations performed for eight antenna devices 2 of different sizes.

[0043] In particular, eight results of simulations are shown which are carried out while the distance D between the first base plate 20a and the second base plate 20b is changed, in a case in which the lengths of the short sides of the first base plate 20a and the second base plate 20b have the same length W and the lengths of the long sides thereof have the same length L.

[0044] The values ​​of the improvement in the correlation coefficients, the improvement in the efficiency of the first antenna 21 and the improvement in the efficiency of the second antenna 22 in Fig. 3 are mean values ​​for the bands from 700 MHz to 950 MHz. The values ​​for improvement in correlation coefficients and improvement in efficiency represent the degree of improvement with respect to the correlation coefficients or efficiency in the case of a base plate.

[0045] As in Fig. As shown in Figure 3, it can be said that the correlation coefficients and the efficiency of the first antenna 21 are improved in all eight antenna devices of different sizes (with the exception of the correlation coefficient for 25x70) by using a setup with two base plates, compared to the case with one base plate. Furthermore, the efficiency of the second antenna 22 is not worsened (is slightly improved) compared to the case with one base plate.

[0046] This is considered a significant improvement in a case where a stable improvement in the correlation coefficients is observed and where the efficiency of the first antenna exceeds 0.3 dB.

[0047] In this case, it can be said that there has been a considerable improvement in cases No. 3 to No. 6 among those in Fig. The 3 cases shown, numbers 1 to 8, are present.

[0048] In these cases, if the length L of the long sides of the first base plate 20a and the second base plate 20b is greater than or equal to 70 mm and not greater than 90 mm, and the length W of the short sides of the first base plate 20a and the second base plate 20b is (25+t) mm (where t is greater than or equal to 10 and not greater than 20), the distance between the first base plate 20a and the second base plate 20b is greater than or equal to 2 mm and is not greater than (16-2t / 5) mm.

[0049] This means that the antenna performance is considerably improved when the conditions described above are met. For example, if W = 35 mm and t = 10, D is 12 mm or less, and if W = 45 mm and t = 20, D is 8 mm or less.

[0050] It should be noted that the cases described here are only a description of dimensions with which a considerable effect can be achieved when using a setup in which two base plates are used, and obviously a certain improvement effect can even be achieved when t is less than 10 or greater than 20 by using the setup in which two base plates are used.

[0051] Next, a case is described in which the number of antennas is more than two. Fig. 4A is a graphical representation that shows an example of the construction of the antenna device 3 when the number of antennas is four, and Fig. 4B is a graphical representation of another example setup of the antenna device 4 when the number of antennas is four.

[0052] The in Fig. The antenna device 3 shown in Figure 4A includes the first base plate 30a, the second base plate 30b, the first antenna 31, the second antenna 32, the third antenna 33 and the fourth antenna 34.

[0053] The first base plate 30a and the second base plate 30b are positioned parallel to each other.

[0054] The first antenna 31 is an inverted L-antenna and contains the first element 31a, which extends perpendicular to the second base plate 30b in a rectangular shape, and the second element 31b, which extends along a long side of the second base plate 30b.

[0055] Furthermore, the first antenna 31 is connected to a corner part of the second base plate 30b via the first power feed point 35.

[0056] The second antenna 32 is also an inverted L-antenna and contains the third element 32a, which extends perpendicular to the first base plate 30a on the same side as the first element 31a of the first antenna 31, and the fourth element 32b, which extends along the long side of the second base plate 30b.

[0057] The second antenna 32 is connected via the second power feed point 36 to a corner part of the first base plate 30a on the same side as the corner part of the second base plate 30b, where the first power feed point 35 is located.

[0058] Here, a recess is formed in the second base plate 30b to achieve a reduction in the size of the antenna device 3 by extending the third element 32a perpendicular to the first base plate 30a without causing the third element 32a to protrude outwards.

[0059] The direction in which the fourth element 32b of the second antenna 32 extends from the third element 32a is the same as the direction in which the second element 31b of the first antenna 31 extends from the first element 31a.

[0060] The second element 31b of the first antenna 31 is further provided such that, as seen from the second base plate 30b, it is positioned at the same height as the fourth element 32b of the second antenna 32.

[0061] The third antenna 33 is also an inverted L-antenna and contains the fifth element 33a, which extends perpendicular to the first base plate 30a on one side opposite a side of the first element 31a of the first antenna 31, and the sixth element 33b, which extends along one long side of the first base plate 30a.

[0062] The third antenna 33 is connected via the third power feed point 37 to a corner part of the first base plate 30a, which is positioned diagonally to the corner part of the second base plate 30b, where the second power feed point 36 is located.

[0063] The fourth antenna 34 is also an inverted L-antenna and contains the seventh element 34a, which extends perpendicular to the second base plate 30b on the side opposite the first element 31a of the first antenna 31, and the eighth element 34b, which extends along the long side of the first base plate 30a.

[0064] The fourth antenna 34 is connected via the fourth power feed point 38 to a corner part of the second base plate 30b on the same side as the corner part of the first base plate 30a, where the third power feed point 37 is located.

[0065] Here, a recess is formed in the first base plate 30a to achieve a reduction in the size of the antenna device 3 by extending the seventh element 34a perpendicularly to the second base plate 30b without causing the seventh element 34a to protrude outwards.

[0066] The direction in which the eighth element 34b of the fourth antenna 34 extends from the seventh element 34a is the same as the direction in which the sixth element 33b of the third antenna 33 extends from the fifth element 33a.

[0067] The sixth element 33b of the third antenna 33 is designed such that, as seen from the first base plate 30a, it is positioned at the same height as the eighth element 34b of the fourth antenna 34.

[0068] The in Fig. Antenna device 4 shown in Figure 4B includes the first base plate 40a, the second base plate 40b, the first antenna 41, the second antenna 42, the third antenna 43 and the fourth antenna 44.

[0069] Here, the first base plate 40a and the second base plate 40b are arranged parallel to each other.

[0070] The first antenna 41 is an inverted L-antenna and contains the first element 41a, which extends perpendicular to the second base plate 40b in a rectangular shape, and the second element 41b, which extends along one long side of the second base plate 40b.

[0071] Furthermore, the first antenna 41 is connected to a corner part of the second base plate 40b via the first power feed point 45.

[0072] The second antenna 42 is also an inverted L-antenna and contains the third element 42a, which extends perpendicular to the first base plate 40a on the same side as the first element 41a of the first antenna 21, and the fourth element 42b, which extends along the long side of the second base plate 40b.

[0073] The second antenna 42 is connected via the second power feed point 46 to a corner part of the first base plate 40a on the same side as the corner part of the second base plate 40b, where the first power feed point 45 is located.

[0074] Here, a recess is formed in the second base plate 40b to achieve a reduction in the size of the antenna device 4 by extending the third element 42a perpendicular to the first base plate 40a without causing the third element 42a to protrude outwards.

[0075] The direction in which the fourth element 42b of the second antenna 42 extends from the third element 42a is the same as the direction in which the second element 41b of the first antenna 41 extends from the first element 41a.

[0076] The second element 41b of the first antenna 41 is further provided such that, as seen from the second base plate 40b, it is positioned at the same height as the fourth element 42b of the second antenna 42.

[0077] The third antenna 43 is also an inverted L-antenna and contains the fifth element 43a, which extends perpendicular to the first base plate 40a on one side opposite a side of the first element 41a of the first antenna 41, and the sixth element 43b, which extends along one long side of the first base plate 40a.

[0078] The third antenna 43 is connected via the third power feed point 47 to a corner part of the second base plate 40b, which is positioned diagonally to the corner part of the first base plate 40a, where the second power feed point 46 is located.

[0079] Here, a recess is formed in the first base plate 40a to achieve a reduction in the size of the antenna device 4 by extending the fifth element 43a perpendicularly to the second base plate 40b without causing the fifth element 43a to protrude outwards.

[0080] The fourth antenna 44 is also an inverted L-antenna and contains the seventh element 44a, which extends perpendicular to the first base plate 40a on one side opposite a side of the first element 41a of the first antenna 41, and the eighth element 44b, which extends along the long side of the first base plate 40a.

[0081] The fourth antenna 44 is connected via the fourth power feed point 48 to a corner part of the first base plate 40a on the same side as the corner part of the second base plate 40b, where the third power feed point 47 is located.

[0082] The direction in which the eighth element 44b of the fourth antenna 44 extends from the seventh element 44a is the same as the direction in which the sixth element 43b of the third antenna 43 extends from the fifth element 43a.

[0083] The sixth element 43b of the third antenna 43 is designed such that, as seen from the first base plate 40a, it is positioned at the same height as the eighth element 44b of the fourth antenna 44.

[0084] In the in the Fig. 4A and Fig. In the antenna devices 3 and 4 shown in Figure 4B, the symmetry of the current distributions and the radiation patterns of the antenna devices 3 and 4 is disrupted, as in the case of the antenna devices shown in Figure 4B. Fig. 1B antenna device 2. Therefore, the correlation coefficients and the efficiency of the antennas are significantly improved.

[0085] In the above embodiment, for the purpose of miniaturizing the antenna devices 2 to 4, recesses are formed in the base plates, and the antenna elements are made to pass through the recesses, but the recesses do not necessarily have to be provided as long as a required degree of miniaturization is achieved.

[0086] Fig. Figure 5 is a graphic representation showing an example of the construction of an antenna device 5 in which no groove is provided in the second base plate 50b in a case where the first base plate 50a and the second base plate 50b are present.

[0087] The antenna device 5 contains the first base plate 50a, the second base plate 50b, the first antenna 51 and the second antenna 52.

[0088] Here, the first base plate 50a and the second base plate 50b are arranged parallel to each other.

[0089] The first antenna 51 is an inverted L-antenna and contains the first element 51a, which extends perpendicular to the first base plate 50a in a rectangular shape, and the second element 51b, which extends along one long side of the first base plate 50a.

[0090] The first antenna 51 is connected to a corner part of the first base plate 50a via a first power feed point 53.

[0091] Unlike the ones in Fig. In the antenna device 2 shown in 1B, the second base plate 50b has no recess through which the first element 51a passes, and the first element 51a runs along an outer side of the second base plate 50b and extends perpendicularly with respect to the first base plate 50a.

[0092] The second antenna 52 is also an inverted L-antenna and contains the third element 52a, which extends perpendicular to the first base plate 50a on the same side as the first element 51a of the first antenna 51, and the fourth element 52b, which extends along one long side of the second base plate 50b.

[0093] The second antenna 52 is connected via the second power feed point 54 to a corner part of the second base plate 50b, which is positioned diagonally to the corner part of the first base plate 50a, where the first power feed point 53 is located.

[0094] The direction in which the fourth element 52b of the second antenna 52 extends from the third element 52a is essentially opposite to the direction in which the second element 51b of the first antenna 51 extends from the first element 51a.

[0095] The second element 51b of the first antenna 51 is designed so that, as seen from the second base plate 50b, it is positioned at the same height as the fourth element 52b of the second antenna 52.

[0096] In this case, as in the case of the in Fig. In the antenna device 2 shown in Figure 1B, the symmetry of the current distributions and the radiation patterns of the antenna device 5 is disrupted. Therefore, the correlation coefficient and the efficiency of the antenna are significantly improved.

[0097] In the embodiment described above, the description was carried out as an example with an inverted L-antenna in which one element is partially bent (may hereinafter be referred to as the “partially bent element”), but the technical scope of the present disclosure is not limited to the inverted L-antenna and may, for example, be a monopole antenna, a loop antenna or another linear antenna or a dipole antenna and is not specifically limited.

[0098] The antenna device according to the present disclosure further comprises a third antenna, wherein the third antenna is connected to the first base plate via a third current feed point, and wherein the third antenna is provided on a side of the first base plate and the second base plate that is opposite a side of the first antenna and the second antenna.

[0099] The antenna device according to the present disclosure further comprises a fourth antenna, wherein the fourth antenna is connected to the second base plate via a fourth current feed point, and wherein the fourth antenna is provided on a side of the first base plate and the second base plate that is opposite a side of the first antenna and the second antenna.

[0100] In the antenna device according to the present disclosure, the second base plate contains a recess through which the first antenna passes.

[0101] The antenna device according to the present disclosure further comprises a third antenna and a fourth antenna, wherein the third antenna is connected to the first base plate via a third current feed point, and wherein the fourth antenna is connected to the second base plate via a fourth current feed point, and wherein the third antenna and the fourth antenna are provided on a side of the first base plate and the second base plate that is opposite a side of the first antenna and the second antenna.

[0102] In the antenna device according to the present disclosure, the third antenna is connected to another corner part of the first base plate, which is positioned diagonally to the corner part of the first base plate to which the second antenna is connected, and wherein the fourth antenna is connected to a corner part of the second base plate, which is positioned diagonally to a corner part of the second base plate to which the first antenna is connected.

[0103] In the antenna device according to the present disclosure, the third antenna and the fourth antenna each contain a partially bent element.

[0104] In the antenna device according to the present disclosure, part of the partially bent element in the third antenna and part of the partially bent element of the fourth antenna extend in the same direction.

[0105] In the antenna device according to the present disclosure, the first base plate has a recess at a corner part of the first base plate through which the fourth antenna passes.

[0106] The antenna device according to the present disclosure further comprises a third antenna and a fourth antenna, wherein the third antenna is connected to the second base plate via a third current feed point, and wherein the fourth antenna is connected to the first base plate via a fourth current feed point, and wherein the third antenna and the fourth antenna are provided on a side of the first base plate and the second base plate that is opposite a side of the first antenna and the second antenna.

[0107] In the antenna device according to the present disclosure, the third antenna is connected to a corner part of the second base plate which is positioned diagonally to the corner part of the first base plate to which the second antenna is connected, and wherein the fourth antenna is connected to a corner part of the first base plate which is positioned diagonally to the corner part of the second base plate to which the first antenna is connected.

[0108] In the antenna device according to the present disclosure, the third antenna and the fourth antenna each contain a partially bent element.

[0109] In the antenna device according to the present disclosure, part of the partially bent element in the third antenna and part of the partially bent element of the fourth antenna extend in the same direction.

[0110] In the antenna device according to the present disclosure, the first base plate has a recess at a corner part of the first base plate through which the third antenna passes. Commercial applicability

[0111] The antenna device according to the present disclosure is suitable for applications on antenna devices for carrying out communication using a plurality of antennas. List of reference symbols 1, 2, 3, 4, 5 Antenna device 10 Base plate 20a, 30a, 40a, 50a First base plate 20b, 30b, 40b, 50b Second base plate 11, 21, 31, 41, 51 First Antenna 11a, 21a, 31a, 41a, 51a First element 11b, 21b, 31b, 41b, 51b Second element 12, 22, 32, 42, 52 Second antenna 12a, 22a, 32a, 42a, 52a Third element 12b, 22b, 32b, 42b, 52b Fourth element 13, 23, 35, 45, 53 First power feed-in point 14, 24, 36, 46, 54 Second power feed-in point 33, 43 Third antenna 33a, 43a Fifth Element 33b, 43b Sixth Element 34, 44 Fourth antenna 34a, 44a Seventh Element 34b, 44b Eighth Element 37, 47 Third power feed-in point 38, 48 Fourth power feed-in point

Claims

[1] Antenna device (4), comprising: a first antenna (41); a second antenna (42); a third antenna (43), a fourth antenna (44), a second base plate (40b) to which the first antenna (41) is connected via a first power injection point (45); and a first base plate (40a) to which the second antenna (42) is connected via a second power feed point (46); wherein the second antenna (42) is provided on the same side as the first antenna (41) with respect to the second base plate (40b), wherein the second base plate (40b) and the first base plate (40a) are provided essentially parallel to each other and are in a state in which the second base plate (40b) and the first base plate (40a) are separate base plates, wherein the third antenna (43) is connected to the second base plate (40b) via a third power injection point (47) and the fourth antenna (44) is connected to the first base plate (40a) via a fourth power injection point (48), and wherein the third antenna (43) and the fourth antenna (44) are provided on one side of the second base plate (40b) and the first base plate (40a) opposite one side of the first antenna (41) and the second antenna (42), and wherein the third antenna (43) is an antenna to be connected to a corner part of the second base plate (40b), and the second antenna (42) is an antenna to be connected to a corner part of the first base plate (40a), the corner part of the first base plate (40a) being positioned diagonally to the corner part of the second base plate (40b). [2] Antenna device (4) according to claim 1, wherein the first antenna (41) and the fourth antenna (44) each contain a partially bent element (41a, 41b, 44a, 44b). [3] Antenna device (4) according to claim 2, wherein a part of the partially bent element (41b) in the first antenna (41) and a part of the partially bent element (44b) of the fourth antenna (44) extend in directions that are substantially opposite to each other. [4] Antenna device (4) according to one of claims 1 to 3, wherein the first base plate (40a) has a recess at another corner part of the first base plate (40a), which is positioned diagonally to the corner part of the first base plate (40a), through which the third antenna (43) passes. [5] Antenna device (4) according to any one of claims 2 to 4, wherein the distance between the second base plate (40b) and the first base plate (40a) is greater than or equal to 2 mm and not greater than (16-2t / 5) mm, in a case where the second base plate (40b) and the first base plate (40a) are each rectangular base plates, and the length of a long side of each of the second base plate (40b) and the first base plate (40a) is greater than or equal to 70 mm and not greater than 90 mm, and the length of a short side of each of the second base plate (40b) and the first base plate (40a) is (25+t) mm, wherein t is greater than or equal to 10 and not greater than 20. [6] Antenna device (4) according to claim 1, wherein the first base plate (40a) has a recess through which the third antenna (43) passes. [7] Antenna device (4) comprising: a first antenna (41); a second antenna (42); a third antenna (43), a fourth antenna (44), a second base plate (40b) to which the first antenna (41) is connected via a first power injection point (45); and a first base plate (40a) to which the second antenna (42) is connected via a second power feed point (46); wherein the second antenna (42) is provided on the same side as the first antenna (41) with respect to the second base plate (40b), wherein the second base plate (40b) and the first base plate (40a) are provided essentially parallel to each other and are in a state in which the second base plate (40b) and the first base plate (40a) are separate base plates, wherein the third antenna (43) is connected to the second base plate (40b) via a third power injection point (47) and the fourth antenna (44) is connected to the first base plate (40a) via a fourth power injection point (48), and wherein the third antenna (43) and the fourth antenna (44) are provided on one side of the second base plate (40b) and the first base plate (40a) opposite one side of the first antenna (41) and the second antenna (42), and wherein the third antenna (43) is connected to a corner part of the second base plate (40b) which is positioned diagonally to a corner part of the first base plate (40a) to which the second antenna (42) is connected, and wherein the fourth antenna (44) is connected to a corner part of the first base plate (40a) which is positioned diagonally to a corner part of the second base plate (40b) to which the first antenna (41) is connected. [8] Antenna device (4) according to claim 1, wherein the third antenna (43) and the fourth antenna (44) each contain a partially bent element (43a, 43b, 44a, 44b). [9] Antenna device (4) according to claim 8, wherein a part of the partially bent element (43b) in the third antenna (43) and a part of the partially bent element (44b) of the fourth antenna (44) both extend in the same direction. [10] Antenna device (4) according to claim 1, wherein the second base plate (40b) has a recess at a corner part of the second base plate (40b) through which the second antenna (42) passes. [11] Antenna device (3) comprising: a first antenna (31); a second antenna (32); a third antenna (33); a fourth antenna (34); a second base plate (30b) to which the first antenna (31) is connected via a first power injection point (35); and a first base plate (30a) to which the second antenna (32) is connected via a second power feed point (36); wherein the second antenna (32) is provided on the same side as the first antenna (31) with respect to the second base plate (30b), wherein the second base plate (30b) and the first base plate (30a) are provided essentially parallel to each other and are in a state in which the second base plate (30b) and the first base plate (30a) are separate base plates, wherein the third antenna (33) is connected to the first base plate (30a) via a third power injection point (37), and the fourth antenna (34) is connected to the second base plate (30b) via a fourth power injection point (38), and wherein the third antenna (33) and the fourth antenna (34) are provided on one side of the second base plate (30b) and the first base plate (30a) opposite one side of the first antenna (31) and the second antenna (32), and wherein the third antenna (33) is connected to a corner part of the first base plate (30a) which is positioned diagonally to a corner part of the first base plate (30a) to which the second antenna (32) is connected, and wherein the fourth antenna (34) is connected to a corner part of the second base plate (30b) which is positioned diagonally to a corner part of the second base plate (30b) to which the first antenna (31) is connected. [12] Antenna device (3) according to claim 11, wherein the third antenna (33) and the fourth antenna (34) each contain a partially bent element (33a, 33b, 34a, 34b). [13] Antenna device (3) according to claim 12, wherein a part of the partially bent element (33b) in the third antenna (33) and a part of the partially bent element (34b) of the fourth antenna (34) both extend in the same direction. [14] Antenna device (3) according to claim 11, wherein the second base plate (30b) has a recess at a corner part of the second base plate (30b) through which the second antenna (32) passes.

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