JP2012182726A - Multi-antenna device and communication device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a multi-antenna device which reduces mutual coupling between antenna elements while inhibiting the deterioration of the design flexibility of a wiring pattern.SOLUTION: A multi-antenna device 10 includes: a ground part 13 having one side in which a cutout part for reducing mutual coupling is not provided; and a first antenna element 11 and a second antenna element 12 which are disposed in the one side of the ground part 13 so as to face each other. The first antenna element 11 includes a first feeding point connection part 111, a first short circuit part 112, and a first extension part 113, and the second antenna element 12 includes a second feeding point connection part 121, a second short circuit part 122, and a second extension part 123.

Description

  The present invention relates to a multi-antenna device and a communication device, and particularly to a multi-antenna device and a communication device provided with a plurality of antenna elements.

  Conventionally, a multi-antenna apparatus including a plurality of antenna elements is known (see, for example, Patent Document 1).

  In the above-mentioned Patent Document 1, a ground pattern having one side provided with a notch for reducing mutual coupling (a ground part) and a ground pattern are arranged so as to face each other with the notch part of the ground pattern interposed therebetween, respectively. There is disclosed a multi-element antenna (multi-antenna device) including a first radiating element (first antenna element) and a second radiating element (second antenna element) having an F shape.

JP 2007-13643 A

  However, in the multi-element antenna (multi-antenna device) of Patent Document 1 described above, mutual coupling between radiating elements (antenna elements) can be suppressed by providing a cutout in the ground pattern (grounding part). Since it is necessary to provide a notch for reducing mutual coupling in the pattern, there is an inconvenience that a circuit cannot be installed in the vicinity of the notch. For this reason, there exists a problem that the freedom degree of wiring pattern design falls.

  The present invention has been made to solve the above-described problems, and one object of the present invention is to prevent mutual coupling between antenna elements while suppressing a decrease in the degree of freedom of wiring pattern design. To provide a multi-antenna device and a communication device that can be made small.

Means for Solving the Problems and Effects of the Invention

  A multi-antenna apparatus according to a first aspect of the present invention includes a grounding portion having one side not provided with a notch for reducing mutual coupling, and a first antenna arranged to face one side of the grounding portion. A first antenna element having a first end connected to a first feeding point that extends in a direction intersecting with one side of the grounding portion and supplies high-frequency power on one side of the grounding portion. A first short-circuit portion extending in a direction intersecting with one side of the grounding portion and having one end grounded in a region closer to the second antenna element than the first feeding point connection portion of one side of the grounding portion. And a first extension portion that connects the other end of the first short-circuit portion and the other end of the first feeding point connection portion and extends to the opposite side of the second antenna element side. Extending in a direction intersecting one side And a second feed point connecting portion having one end connected to a second feed point for supplying high-frequency power on one side of the ground portion, and extending in a direction intersecting with one side of the ground portion and the second of the one side of the ground portion A second short-circuit portion arranged so that one end is grounded in a region closer to the first antenna element than the two-feed-point connection portion and is opposed to the first short-circuit portion; the other end of the second short-circuit portion; A second extension portion that connects the other end of the point connection portion and extends to the opposite side of the first antenna element side is included.

  In the multi-antenna device according to the first aspect of the present invention, as described above, by providing the grounding part having one side not provided with the notch part for reducing mutual coupling, the notch part is provided on one side of the grounding part. Unlike the case where it is provided, it is possible to prevent the circuit arrangement position from being restricted, such as avoiding a notch, and therefore, it is possible to suppress a reduction in the degree of freedom in wiring pattern design. In addition, the first feeding point to the first feeding point connection portion, the first extension portion, the first short-circuit portion, the region in the vicinity of one side of the grounding portion where the notch portion for reducing mutual coupling is not provided, the second short-circuit portion The current flowing from the first feed point to the second feed point by energizing the second feed point via the second extension portion and the second feed point connection portion causes the first feed point connection portion and the first extension to flow. Part, the first short circuit part, the region near one side of the grounding part not provided with the notch for reducing mutual coupling, the second short circuit part, the second extension part, and the second feed point connection part Since attenuation occurs, mutual coupling between the first antenna element and the second antenna element can be reduced. Therefore, in this multi-antenna device, it is possible to reduce the mutual coupling between the antenna elements while suppressing a reduction in the degree of freedom of the wiring pattern design. In addition, since the mutual coupling between the antenna elements can be reduced, it is not necessary to increase the distance between the antenna elements in order to reduce the mutual coupling between the antenna elements, and the multi-antenna apparatus can be reduced in size accordingly. Can do. The effect that the mutual coupling between the antenna elements can be reduced has been confirmed by a simulation performed by the inventor described later.

  In the multi-antenna device according to the first aspect, preferably, the first extension portion has a length greater than that of the first feed point connection portion and the first short-circuit portion, and the second extension portion is the second extension portion. It has a length longer than that of the feed point connection portion and the second short-circuit portion. If comprised in this way, the elongate antenna apparatus along one side of a grounding part can be provided, reducing the mutual coupling between antenna elements.

  In the multi-antenna device according to the first aspect, preferably, the first antenna element and the second antenna element are perpendicular to a straight line connecting the first feeding point and the second feeding point, and the first feeding point and the second feeding point. The lines are substantially symmetrical with respect to a straight line passing through the midpoint of the point. If comprised in this way, since the balance of arrangement | positioning of a 1st antenna element and a 2nd antenna element can be improved, the gain of a 1st antenna element and a 2nd antenna element can be improved.

  In the multi-antenna device according to the first aspect, preferably, the first short-circuit portion and the second short-circuit portion are arranged substantially perpendicular to one side of the ground portion and substantially parallel to each other. If comprised in this way, since the distance of a 1st short circuit part and a 2nd short circuit part becomes equal in any place which opposes, it is easy to make the maximum space | interval of a 1st short circuit part and a 2nd short circuit part small. it can. As a result, the distance between the first antenna element and the second antenna element can be reduced, so that a small multi-antenna device can be provided.

  In the multi-antenna device according to the first aspect, preferably, a portion of the first extension portion extending to the side opposite to the second antenna element side is formed in a bent or curved shape, and the first antenna of the second extension portion. The portion extending on the side opposite to the element side is formed in a bent or curved shape. According to this structure, even when the arrangement region in the direction in which the first antenna element and the second antenna element are opposed to each other is small, the length necessary for the first antenna element and the second antenna element is obtained due to the bent or curved shape. Therefore, the multi-antenna device can be further downsized because it is not necessary to widen the area to be arranged.

  In the multi-antenna device according to the first aspect, preferably, the first antenna element and the second antenna are arranged between the first antenna element and the first feeding point, and impedance matching is performed at a predetermined frequency of the high-frequency power. A first matching circuit for suppressing mutual coupling with the antenna element, and a first matching circuit disposed between the second antenna element and the second feeding point, and performing impedance matching at a predetermined frequency of the high-frequency power while performing impedance matching. And a second matching circuit for suppressing mutual coupling between the antenna element and the second antenna element. With this configuration, it is possible to reduce the mutual coupling between the antenna elements at a predetermined frequency and to achieve impedance matching, thereby further reducing transmission loss of energy transmitted through the antenna elements. it can.

  A communication device according to a second aspect of the present invention includes a multi-antenna device, and the multi-antenna device has a grounding portion having one side not provided with a notch for reducing mutual coupling, and a grounding portion on each side. A first power feeding device including a first antenna element and a second antenna element arranged so as to face each other, wherein the first antenna element extends in a direction intersecting with one side of the ground portion and supplies high-frequency power on one side of the ground portion. A first feed point connecting portion having one end connected to the point, and extending in a direction intersecting one side of the grounding portion and in a region closer to the second antenna element than the first feeding point connecting portion of one side of the grounding portion A first short-circuit portion whose one end is grounded, and a first extension portion that connects the other end of the first short-circuit portion and the other end of the first feed point connection portion and extends to the opposite side of the second antenna element side. Including the second antenna The child intersects with one side of the grounding part and a second feeding point connecting part extending in a direction intersecting with one side of the grounding part and having one end connected to a second feeding point supplying high-frequency power on one side of the grounding part. A second short-circuit portion that extends in the direction and is arranged so that one end is grounded in a region closer to the first antenna element than the second feed point connection portion of one side of the ground portion and faces the first short-circuit portion And a second extension portion that connects the other end of the second short-circuit portion and the other end of the second feed point connection portion and extends to the opposite side to the first antenna element side.

  In the communication device according to the second aspect of the present invention, as described above, by providing the grounding part having one side not provided with the notch part for reducing mutual coupling, the notch part is provided on one side of the grounding part. Unlike the case, since it is possible to prevent the circuit arrangement position from being restricted, such as avoiding a notch, it is possible to suppress a reduction in the degree of freedom in wiring pattern design. In addition, the first feeding point to the first feeding point connection portion, the first extension portion, the first short-circuit portion, the region in the vicinity of one side of the grounding portion where the notch portion for reducing mutual coupling is not provided, the second short-circuit portion The current flowing from the first feed point to the second feed point by energizing the second feed point via the second extension portion and the second feed point connection portion causes the first feed point connection portion and the first extension to flow. Part, the first short circuit part, the region near one side of the grounding part not provided with the notch for reducing mutual coupling, the second short circuit part, the second extension part, and the second feed point connection part Since attenuation occurs, mutual coupling between the first antenna element and the second antenna element can be reduced. Therefore, in this multi-antenna device, it is possible to reduce the mutual coupling between the antenna elements while suppressing a reduction in the degree of freedom of the wiring pattern design. In addition, since the mutual coupling between the antenna elements can be reduced, it is not necessary to increase the distance between the antenna elements in order to reduce the mutual coupling between the antenna elements, and the multi-antenna apparatus can be reduced in size accordingly. Can do. Such an effect is particularly effective in a communication device that is desired to be downsized. The effect that the mutual coupling between the antenna elements can be reduced has been confirmed by a simulation performed by the inventor described later.

It is the top view which showed the whole structure of the communication apparatus by the 1st-3rd embodiment of this invention. It is the top view which showed the multi-antenna apparatus of the communication apparatus by 1st Embodiment of this invention. It is a figure for demonstrating the distance L2 of the multi-antenna corresponding to 1st-3rd embodiment of this invention. It is the figure which showed the characteristic of the S parameter in the simulation of the multi-antenna apparatus corresponding to 1st Embodiment of this invention. It is the top view which showed the multi-antenna apparatus by a comparative example. It is the figure which showed the characteristic of S parameter in the simulation of the multi-antenna apparatus by the comparative example shown in FIG. It is the figure which showed the relationship between the distance L2 and the S parameter of a predetermined frequency in the simulation of the multi-antenna apparatus corresponding to 1st Embodiment of this invention. It is the figure which showed the relationship between the distance D1 between feed points and the S parameter of a predetermined frequency in the simulation of the multi-antenna apparatus corresponding to 1st Embodiment of this invention. It is the figure which showed the relationship between the frequency and S parameter in the simulation of the multi-antenna apparatus corresponding to 1st Embodiment of this invention. It is the top view which showed the multi-antenna apparatus of the communication apparatus by 2nd Embodiment of this invention. It is the figure which showed the characteristic of the S parameter in the simulation of the multi-antenna apparatus corresponding to 2nd Embodiment of this invention. It is the top view which showed the multi-antenna apparatus of the communication apparatus by 3rd Embodiment of this invention. It is the figure which showed the characteristic of S parameter in the simulation of the multi-antenna apparatus corresponding to 3rd Embodiment of this invention. It is the plane enlarged view which showed the multi-antenna apparatus of the communication apparatus by the 1st modification of 1st Embodiment of this invention. It is the plane enlarged view which showed the multi-antenna apparatus of the communication apparatus by the 2nd modification of 1st Embodiment of this invention. FIG. 16 is a diagram illustrating a π-type matching circuit of the multi-antenna apparatus of the communication device according to the second modification illustrated in FIG. 15. It is the figure which showed the T type | mold matching circuit of the multi-antenna apparatus of the communication apparatus by the 2nd modification shown in FIG. It is the figure which showed the L type | mold matching circuit of the multi-antenna apparatus of the communication apparatus by the 2nd modification shown in FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
First, with reference to FIG. 1 and FIG. 2, the structure of the communication apparatus 100 by 1st Embodiment of this invention is demonstrated.

  As shown in FIG. 1, the communication device 100 according to the first embodiment of the present invention has a substantially rectangular shape when viewed from the front. In addition, the communication device 100 includes a display screen unit 1 and an operation unit 2 including buttons. A multi-antenna apparatus 10 is provided inside the housing of the communication device 100.

  The multi-antenna device 10 is configured for MIMO (Multiple-Input Multiple-Output) communication capable of performing multiple input / output at a predetermined frequency using a plurality of antenna elements.

  As shown in FIG. 2, the multi-antenna device 10 includes a first antenna element 11 and a second antenna element 12, a ground portion 13, a first feeding point 14 for supplying high-frequency power to the first antenna element 11, and And a second feeding point 15 for supplying high-frequency power to the second antenna element 12.

  The first antenna element 11 and the second antenna element 12 are arranged to face each other. The first antenna element 11 is disposed on the X1 direction side of the second antenna element 12. The first antenna element 11 (second antenna element 12) has a thin plate shape and is provided on the surface of a substrate (not shown). Further, an element portion, which will be described later, of the first antenna element 11 (second antenna element 12) has an electrical length L1 that is about ¼ of the wavelength λ of 2.35 GHz to which the multi-antenna device 10 corresponds. The first antenna element 11 and the second antenna element 12 are perpendicular to a straight line connecting the first feeding point 14 and the second feeding point 15 and have a midpoint between the first feeding point 14 and the second feeding point 15. With respect to the straight line 16 which passes, it is formed in a shape substantially line symmetrical with each other. The electrical length is not a physical length but a length based on one wavelength of a signal traveling on a conductor constituting the antenna.

  The first antenna element 11 includes a first feeding point connection portion 111, a first short-circuit portion 112, and a first extension portion 113, and is formed in an inverted F shape. The first feeding point connection unit 111 has one end (an end on the Y2 direction side) connected to the first feeding point 14 provided on one side of the grounding unit 13 and is substantially perpendicular to the one side of the grounding unit 13 ( (Y1 direction). One end (Y2 direction side end) of the first short-circuit portion 112 is grounded to a region closer to the second antenna element 12 (X2 direction side) than the first feeding point connection portion 111 of one side of the grounding portion 13. , And is formed to extend in a substantially vertical direction (Y1 direction) with respect to one side of the grounding portion 13. The first extension portion 113 connects the other end (end portion on the Y1 direction side) of the first short-circuit portion 112 and the other end (end portion on the Y1 direction side) of the first feeding point connection portion 111 and the second antenna. It is formed to extend on the side opposite to the element 12 side (X1 side). Further, the first extension portion 113 is formed to have a length longer than that of the first feeding point connection portion 111 and the first short-circuit portion 112. The element portion of the first antenna element 11 includes a first feeding point connection portion 111 and a portion on the X1 direction side from the first feeding point connection portion of the first extension 113.

  The second antenna element 12 includes a second feeding point connection part 121, a second short-circuit part 122, and a second extension part 123, and is formed in an inverted F shape. The second feeding point connecting portion 121 has one end (an end on the Y2 direction side) connected to the second feeding point 15 provided on one side of the grounding portion 13 and is substantially perpendicular to the one side of the grounding portion 13 ( (Y1 direction). One end (Y2 direction side end) of the second short-circuit portion 122 is grounded to a region closer to the first antenna element 11 (X1 direction side) than the second feeding point connection portion 121 on one side of the grounding portion 13. , And is formed to extend in a substantially vertical direction (Y1 direction) with respect to one side of the grounding portion 13. The second extension portion 123 connects the other end (end portion on the Y1 direction side) of the second short-circuit portion 122 and the other end (end portion on the Y1 direction side) of the second feeding point connection portion 121 and the first antenna. It is formed so as to extend on the side opposite to the element 11 side (X2 side). In addition, the second extension portion 123 is formed to have a length greater than that of the second feeding point connection portion 121 and the second short-circuit portion 122. The element portion of the second antenna element 12 includes a second feeding point connection portion 121 and a portion on the X2 direction side from the second feeding point connection portion of the second extension portion 123. Further, the first short-circuit portion 112 and the second short-circuit portion 122 are opposed to each other, and are substantially perpendicular to one side of the grounding portion and are substantially parallel to each other.

  Here, in this embodiment, the one side where the first feeding point 14 and the second feeding point 15 of the grounding portion 13 are arranged is formed in a substantially linear shape. That is, a cutout portion for reducing mutual coupling is not provided on one side where the first antenna element 11 and the second antenna element 12 of the grounding portion are provided.

  The first feeding point 14 (second feeding point 15) is disposed at the end of the first antenna element 11 (second antenna element 12) on the Y2 direction side. The first feeding point 15 (second feeding point 16) connects the first antenna element 11 (second antenna element 12) and a feeding line (not shown).

  The multi-antenna device 10 includes a first feeding point connection part 111, a first extension part 113, a first shorting part 112, a region near one side of the grounding part 13, a second shorting part 122, a second extension from the first feeding point 14. The second feeding point 15 can be energized via the part 123 and the second feeding point connecting part 121.

  In the first embodiment, as described above, by providing the grounding part 13 having one side where the notch part for reducing mutual coupling is not provided, unlike the case where the notch part is provided on one side of the grounding part 13. Since it is possible to prevent the circuit arrangement position from being restricted, such as avoiding a notch, it is possible to suppress a reduction in the degree of freedom in wiring pattern design. Further, from the first feeding point 14 to the first feeding point connection part 111, the first extension part 113, the first short-circuit part 112, the region near one side of the grounding part 13, the second short-circuit part 122, the second extension part 123, and the first By configuring so that the second feeding point 15 can be energized via the two feeding point connection part 121, the current flowing from one feeding point is the first feeding point connection part 111, the first extension part 113, the first short circuit. Part 112, the region near one side of the grounding part 13, the second short-circuit part 122, the second extension part 123, and the second feeding point connection part 121, and so on until the other feeding point is reached. Mutual coupling between the first antenna element 11 and the second antenna element 12 can be reduced. Therefore, in this multi-antenna device 10, it is possible to reduce the mutual coupling between the antenna elements while suppressing a reduction in the degree of freedom of the wiring pattern design. In addition, since the mutual coupling between the antenna elements can be reduced, it is not necessary to increase the distance between the antenna elements in order to reduce the mutual coupling between the antenna elements, and the multi-antenna device 10 is reduced in size accordingly. be able to. The effect that the mutual coupling between the antenna elements can be reduced has been confirmed by a simulation performed by the inventor described later.

  In the first embodiment, the first extension portion 113 is formed to have a length larger than that of the first feeding point connection portion 111 and the first short-circuit portion 112, and the second extension portion 123 is formed as the second feeding portion. Providing the elongated antenna device 10 along one side of the grounding portion 13 while reducing the mutual coupling between the antenna elements by forming it to be longer than the point connection portion 121 and the second short-circuit portion 122. can do.

  In the first embodiment, the first antenna element 11 and the second antenna element 12 are perpendicular to the straight line connecting the first feeding point 14 and the second feeding point 15 and the first feeding point 14 and the second feeding point. The first antenna element 11 and the second antenna element 12 can be arranged in a substantially symmetrical manner with respect to the straight line 16 that passes through the midpoint of the first antenna element 11. The gains of the antenna element 11 and the first antenna element 12 can be balanced.

  Further, in the first embodiment, the first short-circuit portion 112 and the second short-circuit portion 122 are arranged substantially perpendicular to one side of the ground portion 13 and substantially parallel to each other. Since the distance to the second short-circuit portion 122 is the same at any facing location, the maximum distance between the first short-circuit portion 112 and the second short-circuit portion 122 can be easily reduced. As a result, the distance between the first antenna element 11 and the second antenna element 12 can be reduced, so that a small multi-antenna device 10 can be provided.

  Next, the results of simulation performed to confirm the effects of the first embodiment described above will be described. In this simulation, the multi-antenna apparatus 10 corresponding to the first embodiment shown in FIG. 2 was compared with the multi-antenna apparatus 20 according to the comparative example shown in FIG.

  In the multi-antenna device 10 corresponding to the first embodiment, the first antenna element 11 and the second antenna element 12 are arranged so that the distance D1 between the first feeding point 14 and the second feeding point 15 is 8 mm. Further, the first antenna element 11 (second antenna element) is set so that the distance D2 between the first feeding point 14 (second feeding point 15) and the grounding position of the first short-circuit portion 112 (second short-circuit portion 122) is 1 mm. 12) was formed. In addition, the first feeding point connection part 111, the first extension part 113, the first short circuit part 112, the vicinity of one side of the ground part 13 where the notch part for reducing mutual coupling is not provided, the second short circuit part 122. The distance L2 (see FIG. 3) from the first feeding point 14 to the second feeding point 15 via the second extension part 123 and the second feeding point connection part 121 is 24 mm (the first antenna element 11 and the second antenna element). The first antenna element 11 and the second antenna element 12 are arranged so that the electric length of the radio wave 12 is about 0.27 times the electrical length of the wavelength λ of the radio wave.

  As shown in FIG. 5, in the multi-antenna device 20 according to the comparative example, the multi-antenna device 10 according to the first embodiment in which the antenna having the shape described in the first embodiment, so-called inverted F-shaped antenna elements 11 and 12 are provided. Unlike the above, antenna elements 21 and 22 having inverted L-shapes are provided. In the multi-antenna device 20 according to the comparative example, the antenna elements 21 and 22 are arranged so that the distance D3 between the first feeding point 14 and the second feeding point 15 is 8 mm, which is the same as D1 in the first embodiment. In the multi-antenna device 20 according to the comparative example, the antenna elements 21 and 22 are formed by adjusting the length of the antenna element 21 (22) so that the resonance frequency is close to that of the multi-antenna device 10 according to the first embodiment. In the multi-antenna device 20 according to the comparative example, a matching circuit (not shown) is provided between the antenna element 21 (22) and the first feeding point 14 (second feeding point 15) in order to achieve impedance matching. Other configurations of the multi-antenna apparatus 20 according to the comparative example are the same as those of the multi-antenna apparatus 10 corresponding to the first embodiment.

  Next, with reference to FIGS. 4 and 6, the characteristics of the S parameter of the multi-antenna apparatus 10 corresponding to the first embodiment and the multi-antenna apparatus 20 according to the comparative example will be described. Here, S11 of the S parameters shown in FIGS. 4 and 6 means the reflection coefficient of the antenna element, and S21 of the S parameters means the strength of mutual coupling between the two antenna elements. In FIGS. 4 and 6, the horizontal axis represents frequency, and the vertical axis represents the sizes of S11 and S21 (unit: dB).

  First, in the multi-antenna apparatus 10 corresponding to the first embodiment, as shown in FIG. 4, S11 is about −26 dB and S21 is about − at a resonance frequency (2.35 GHz) corresponding to the multi-antenna apparatus 10. It was 13 dB. On the other hand, in the multi-antenna device 20 according to the comparative example, as shown in FIG. 6, S11 was about −24 dB and S21 was about −8 dB at the resonance frequency (2.43 GHz).

  As a result, at the resonance frequency, the multi-antenna device 10 corresponding to the first embodiment has a smaller value of S21, which means the magnitude of mutual coupling between the two antenna elements, than the multi-antenna device 20 according to the comparative example. Therefore, it has been found that the mutual coupling between the antenna elements can be reduced by providing the inverted F-shaped antenna elements 11 and 12 facing each other. If the value of S21 is −10 dB or less, the mutual coupling between the antenna elements is considered to be minute. Further, in the multi-antenna device 10 corresponding to the first embodiment, it has been found that the value of S21 is substantially smaller at frequencies other than the vicinity of the resonance frequency as compared with the multi-antenna device 20 according to the comparative example.

  Next, with reference to FIG. 7 and FIG. 8, simulation results when the parameters of the distances D1, D2, and L2 of the first embodiment are changed will be described. In this simulation, the distance D1 between the first feeding point 14 and the second feeding point 15 and the first feeding point 14 (second feeding point 15) of the multi-antenna apparatus 10 corresponding to the first embodiment shown in FIG. Each S parameter was measured by changing the distance D2 between the first short-circuit portion 112 (second short-circuit portion 122) and the grounding position. Moreover, the length of the 1st feeding point connection part 111, the 1st short circuit part 112, the 2nd feeding point connection part 121, and the 2nd short circuit part 122 is not changed. Therefore, the 1st feeding point connection part 111, the 1st extension part 113, the 1st short circuit part 112, the near field of one side of the grounding part 13 in which the notch part for reducing mutual coupling is not provided, the 2nd short circuit part 122 The distance L2 (see FIG. 3) from the first feeding point 14 to the second feeding point 15 via the second extension 123 and the second feeding point connecting part 121 is the first feeding point 14 and the second feeding point 15. The value changes depending on the distance D1.

  FIG. 7 shows the simulation result of S21 when the length of L2 changes. In FIG. 7, L2 is taken on the horizontal axis, and the size of S21 (unit: dB) is taken on the vertical axis. From this result, it can be seen that the value of S21 decreases as L2 increases. Therefore, it has been found that if L2 is lengthened, an effect of reducing mutual coupling between antenna elements can be obtained. It was also found that when L2 does not change, S21 does not change much even if D2 is changed.

  FIG. 8 shows the simulation result of S21 when the length of D1 (D3) is changed. In FIG. 8, D1 (D3) is taken on the horizontal axis, and the size of S21 (unit: dB) is taken on the vertical axis. Here, the simulation result (see the broken line) of S21 when the distance D3 between the first feeding point and the second feeding point of the multi-antenna device 20 according to the comparative example is changed is also shown. In the multi-antenna apparatus 10 corresponding to the first embodiment, D1 is set to 6 mm or more (at this time, L2 has a length of about 0.25 times the electrical length of the wavelength λ corresponding to the multi-antenna apparatus 10). In other words, it was confirmed that the value of S21 was −10 dB or less. Also, D1 is 4 mm (at this time, L2 has a length of about 0.22 times the electrical length of the wavelength λ corresponding to the multi-antenna device 10) to 22 mm (at this time, L2 is determined by the multi-antenna device 10). Even when the electrical length of the corresponding wavelength λ is approximately 0.43 times longer), the value of S21 of the multi-antenna device 10 corresponding to the first embodiment is more than the multi-antenna device 20 according to the comparative example. It turned out to be smaller. Therefore, the multi-antenna apparatus 10 corresponding to the first embodiment having D1 in the range of 6 mm or more and 22 mm or less can reduce the mutual coupling between the antenna elements while reducing the distance between the antenna elements. Play. Further, from this tendency, even when the value of D2 is further reduced, it can be expected that the value of S21 of the multi-antenna apparatus 10 corresponding to the first embodiment is smaller than the multi-antenna apparatus 20 according to the comparative example.

  Next, a simulation result when the resonance frequency is changed will be described with reference to FIG. In this simulation, resonance is achieved by changing the length of the first extension 113 (second extension 123) of the first antenna element 11 (second antenna element 12) of the multi-antenna apparatus 10 corresponding to the first embodiment. Measurements were taken at different frequencies. In addition, the first feeding point connection part 111, the first extension part 113, the first short circuit part 112, the vicinity of one side of the ground part 13 where the notch part for reducing mutual coupling is not provided, the second short circuit part 122. The distance L2 (see FIG. 3) from the first feeding point 14 to the second feeding point 15 via the second extension part 123 and the second feeding point connection part 121 is the electrical length of the wavelength corresponding to each resonance frequency. The first antenna element 11 and the second antenna element 12 were arranged so as to be 0.2 times.

  FIG. 9 shows a simulation result when the resonance frequency is changed. In FIG. 9, the horizontal axis represents frequency, and the vertical axis represents the size of S21 (unit: dB). From this result, it is found that even when the resonance frequency is changed from about 0.79 GHz to about 5.2 GHz, the value of S21 can be reduced to −10 dB or less and the mutual coupling between the antenna elements can be reduced. did.

(Second Embodiment)
Next, the multi-antenna device 30 of the communication device 100 according to the second embodiment of the present invention will be described with reference to FIG. In the second embodiment, unlike the first embodiment, the first extension portion 313 of the first antenna element 31 and the second extension portion 323 of the second antenna element 32 are bent and folded. The multi-antenna device 30 will be described.

  As shown in FIG. 10, the multi-antenna device 30 of the communication device 100 according to the second embodiment supplies high-frequency power to the first antenna element 31 and the second antenna element 32, the ground unit 13, and the first antenna element 31. The first feeding point 14 for performing the operation and the second feeding point 15 for supplying the high frequency power to the second antenna element 32 are included.

  The first antenna element 31 and the second antenna element 32 are arranged to face each other. The first antenna element 31 is disposed on the X1 direction side of the second antenna element 32. The first antenna element 31 (second antenna element 32) has a thin plate shape and is provided on the surface of a substrate (not shown). Further, an element portion, which will be described later, of the first antenna element 31 (second antenna element 32) has an electrical length L1 that is about ¼ of the wavelength λ of 2.44 GHz to which the multi-antenna device 30 corresponds. Further, the first antenna element 31 and the second antenna element 32 are perpendicular to a straight line connecting the first feeding point 14 and the second feeding point 15 and have a midpoint between the first feeding point 14 and the second feeding point 15. With respect to the straight line 16 which passes, it is formed in a shape substantially line symmetrical with each other. The electrical length is not a physical length but a length based on one wavelength of a signal traveling on a conductor constituting the antenna.

  The first antenna element 31 includes a first feeding point connection part 111, a first short-circuit part 112, and a first extension part 313. The first feeding point connection unit 111 has one end (an end on the Y2 direction side) connected to the first feeding point 14 provided on one side of the grounding unit 13 and is substantially perpendicular to the one side of the grounding unit 13 ( (Y1 direction). One end (Y2 direction side end) of the first short-circuit portion 112 is grounded to a region closer to the second antenna element 12 (X2 direction side) than the first feeding point connection portion 111 of one side of the grounding portion 13. , And is formed to extend in a substantially vertical direction (Y1 direction) with respect to one side of the grounding portion 13. The first extension portion 313 connects the other end (end portion on the Y1 direction side) of the first short-circuit portion 112 and the other end (end portion on the Y1 direction side) of the first feeding point connection portion 111 and the second antenna. It is formed so as to extend on the side opposite to the element 32 side (X1 side). Further, the first extension portion 313 is formed to have a length longer than that of the first feeding point connection portion 111 and the first short-circuit portion 112. The element portion of the first antenna element 31 includes a first feeding point connection portion 111 and a portion on the X1 direction side from the first feeding point connection portion of the first extension 313.

  The second antenna element 32 includes a second feeding point connection part 121, a second short-circuit part 122, and a second extension part 323. The second feeding point connecting portion 121 has one end (an end on the Y2 direction side) connected to the second feeding point 15 provided on one side of the grounding portion 13 and is substantially perpendicular to the one side of the grounding portion 13 ( (Y1 direction). One end (Y2 direction side end) of the second short-circuit portion 122 is grounded in a region closer to the first antenna element 31 (X1 direction side) than the second feeding point connection portion 121 on one side of the grounding portion 13. , And is formed to extend in a substantially vertical direction (Y1 direction) with respect to one side of the grounding portion 13. The second extension portion 323 connects the other end (end portion on the Y1 direction side) of the second short-circuit portion 122 and the other end (end portion on the Y1 direction side) of the second feeding point connection portion 121 and the first antenna. It is formed so as to extend on the side opposite to the element 31 side (X2 side). Further, the second extension portion 323 is formed to have a length greater than that of the second feeding point connection portion 121 and the second short-circuit portion 122. The element portion of the second antenna element 32 includes a second feeding point connection portion 121 and a portion on the X2 direction side from the second feeding point connection portion of the second extension portion 323. Further, the first short-circuit portion 112 and the second short-circuit portion 122 are opposed to each other, and are substantially perpendicular to one side of the grounding portion and are substantially parallel to each other.

  Here, in 2nd Embodiment, the part extended to the 2nd antenna element 32 side (X1 direction side) side of the 1st extension part 313 of the 1st antenna element 31 is bent, and the 2nd antenna element 32 side ( It is formed in a shape folded back in the (X2 direction side). Further, the portion of the second extension portion 323 of the second antenna element 32 that extends to the side opposite to the first antenna element 31 side (X2 direction side) is bent and folded back to the first antenna element 31 side (X1 direction side). It is formed into a shape.

  In addition, the other structure of 2nd Embodiment is the same as that of the said 1st Embodiment.

  As described above, also in the configuration of the second embodiment, as in the first embodiment, the mutual coupling between the antenna elements can be reduced while suppressing a reduction in the degree of freedom of wiring pattern design. . Further, since the mutual coupling between the antenna elements can be reduced, it is not necessary to increase the distance between the antenna elements in order to reduce the mutual coupling between the antenna elements, and the multi-antenna device 30 is reduced in size accordingly. be able to.

  Furthermore, in the second embodiment, as described above, the portion extending on the opposite side (X1 direction side) of the first extension portion 313 to the second antenna element 32 side is formed in a bent shape and folded back, The first antenna element 31 and the second antenna element 32 are opposed to each other by forming a bent portion of the extension portion 323 extending to the opposite side (X2 direction side) to the first antenna element 31 side. Even when the arrangement area in the direction is small, the length required for the first antenna element 31 and the second antenna element 32 can be secured by the bent and folded shape, so that it is not necessary to widen the arrangement area. Therefore, the multi-antenna device 30 can be further downsized.

  The remaining effects of the second embodiment are similar to those of the aforementioned first embodiment.

  Next, the result of simulation performed to confirm the effect of the second embodiment described above will be described. In this simulation, the multi-antenna apparatus 30 corresponding to the second embodiment shown in FIG. 10 was compared with the multi-antenna apparatus 20 according to the comparative example shown in FIG.

  In the multi-antenna device 30 corresponding to the second embodiment, the first antenna element 31 and the second antenna element 32 are arranged so that the distance D1 between the first feeding point 14 and the second feeding point 15 is 8 mm. Further, the first antenna element 11 (second antenna element) is set so that the distance D2 between the first feeding point 14 (second feeding point 15) and the grounding position of the first short-circuit portion 112 (second short-circuit portion 122) is 2 mm. 12) was formed. Further, the first feeding point connecting portion 111, the first extending portion 313, the first short-circuiting portion 112, the region near one side of the grounding portion 13 where the notch for reducing mutual coupling is not provided, the second short-circuiting portion 122. The first antenna element 31 and the first antenna element 31 are arranged so that a distance L2 (see FIG. 3) from the first feeding point 14 to the second feeding point 15 via the second extension part 323 and the second feeding point connection part 121 becomes 28 mm. Two antenna elements 32 are arranged.

  Next, with reference to FIG. 6 and FIG. 11, the characteristic of the S parameter of the multi-antenna apparatus 20 according to the comparative example and the multi-antenna apparatus 30 corresponding to the second embodiment will be described.

  As described above, in the multi-antenna device 20 according to the comparative example, as shown in FIG. 6, S11 was about −24 dB and S21 was about −8 dB at the resonance frequency (2.43 GHz). On the other hand, in the multi-antenna device 30 corresponding to the second embodiment, as shown in FIG. 11, S11 is approximately −11 dB at the resonance frequency (2.44 GHz) corresponding to the multi-antenna device 30, and S21 Was about -15.5 dB.

  As a result, at the resonance frequency, the multi-antenna device 30 corresponding to the second embodiment has a smaller value of S21 indicating the strength of mutual coupling between the two antenna elements than the multi-antenna device 20 according to the comparative example. Therefore, even when the first extension portion 313 of the first antenna element 31 and the second extension portion 323 of the second antenna element 32 are formed to be bent and folded, mutual coupling between the antenna elements can be reduced. There was found.

(Third embodiment)
Next, with reference to FIG. 12, the multi-antenna apparatus 40 of the communication apparatus 100 by 3rd Embodiment of this invention is demonstrated. In the third embodiment, unlike the first and second embodiments, the first extension portion 413 of the first antenna element 41 and the second extension portion 423 of the second antenna element 42 are formed in a meander shape. The antenna device 40 will be described.

  The multi-antenna device 40 of the communication device 100 according to the third embodiment supplies high-frequency power to the first antenna element 41 and the second antenna element 42, the ground unit 13, and the first antenna element 41, as shown in FIG. The first feeding point 14 for performing the operation and the second feeding point 15 for supplying the high frequency power to the second antenna element 42 are included.

  The first antenna element 41 and the second antenna element 42 are disposed to face each other. The first antenna element 41 is disposed on the X1 direction side of the second antenna element 42. The first antenna element 41 (second antenna element 42) has a thin plate shape and is provided on the surface of a substrate (not shown). Also, an element portion, which will be described later, of the first antenna element 41 (second antenna element 42) has an electrical length L1 that is about ¼ of the wavelength λ of 2.46 GHz to which the multi-antenna device 40 corresponds. The first antenna element 41 and the second antenna element 42 are perpendicular to the straight line connecting the first feeding point 14 and the second feeding point 15 and have a midpoint between the first feeding point 14 and the second feeding point 15. With respect to the straight line 16 which passes, it is formed in a shape substantially line symmetrical with each other. The electrical length is not a physical length but a length based on one wavelength of a signal traveling on a conductor constituting the antenna.

  The first antenna element 41 includes a first feeding point connection part 111, a first short-circuit part 112, and a first extension part 413. The first feeding point connection unit 111 has one end (an end on the Y2 direction side) connected to the first feeding point 14 provided on one side of the grounding unit 13 and is substantially perpendicular to the one side of the grounding unit 13 ( (Y1 direction). The first short-circuit portion 112 is grounded at one end (the end portion on the Y2 direction side) in a region closer to the second antenna element 42 (X2 direction side) than the first feeding point connection portion 111 on one side of the grounding portion 13. , And is formed to extend in a substantially vertical direction (Y1 direction) with respect to one side of the grounding portion 13. The first extension portion 413 connects the other end (end portion on the Y1 direction side) of the first short-circuit portion 112 and the other end (end portion on the Y1 direction side) of the first feeding point connection portion 111 and the second antenna. It is formed so as to extend on the side opposite to the element 42 side (X1 side). Further, the first extension portion 413 is formed to have a length greater than that of the first feeding point connection portion 111 and the first short-circuit portion 112. The element portion of the first antenna element 41 includes a first feeding point connection portion 111 and a portion on the X1 direction side from the first feeding point connection portion of the first extension 413.

  The second antenna element 42 includes a second feeding point connection part 121, a second short-circuit part 122, and a second extension part 423. The second feeding point connecting portion 121 has one end (an end on the Y2 direction side) connected to the second feeding point 15 provided on one side of the grounding portion 13 and is substantially perpendicular to the one side of the grounding portion 13 ( (Y1 direction). The second short-circuit portion 122 is grounded at one end (an end portion on the Y2 direction side) in a region closer to the first antenna element 41 (X1 direction side) than the second feeding point connection portion 121 on one side of the grounding portion 13. , And is formed to extend in a substantially vertical direction (Y1 direction) with respect to one side of the grounding portion 13. The second extension portion 423 connects the other end (end portion on the Y1 direction side) of the second short-circuit portion 122 and the other end (end portion on the Y1 direction side) of the second feeding point connection portion 121 and the first antenna. It is formed so as to extend on the side opposite to the element 41 side (X2 side). Further, the second extension portion 423 is formed to have a length longer than that of the second feeding point connection portion 121 and the second short-circuit portion 122. The element portion of the second antenna element 42 includes a second feed point connecting portion 121 and a portion on the X2 direction side from the second feed point connecting portion of the second extension portion 423. Further, the first short-circuit portion 112 and the second short-circuit portion 122 are opposed to each other, and are substantially perpendicular to one side of the grounding portion and are substantially parallel to each other.

  Here, in 3rd Embodiment, the part extended to the 2nd antenna element 42 side (X1 direction side) side of the 1st extension part 413 of the 1st antenna element 41 is formed in the meander shape. Further, the portion of the second extension portion 423 of the second antenna element 42 that extends to the side opposite to the first antenna element 41 side (X2 direction side) is formed in a meander shape like the first antenna element.

  The remaining configuration of the third embodiment is similar to that of the aforementioned first embodiment.

  As described above, in the configuration of the third embodiment, as in the first embodiment, the mutual coupling between the antenna elements can be reduced while suppressing a reduction in the degree of freedom of wiring pattern design. . Further, since the mutual coupling between the antenna elements can be reduced, it is not necessary to increase the distance between the antenna elements in order to reduce the mutual coupling between the antenna elements, and the multi-antenna device 30 is reduced in size accordingly. be able to.

  Further, in the third embodiment, as described above, the portion extending on the opposite side (X1 direction side) of the first extension portion 413 to the second antenna element 42 side is formed in a meander shape, and the second extension portion 423 is formed. When the arrangement area in the direction in which the first antenna element 41 and the second antenna element 42 face each other is small by forming a portion extending to the opposite side (X2 direction side) of the first antenna element 41 in a meander shape. In addition, the meander shape can secure the necessary lengths for the first antenna element 41 and the second antenna element 42, so that the multi-antenna device 40 can be further downsized.

  The remaining effects of the third embodiment are similar to those of the aforementioned first embodiment.

  Next, the result of simulation performed to confirm the effect of the third embodiment described above will be described. In this simulation, the multi-antenna device 40 corresponding to the third embodiment shown in FIG. 12 was compared with the multi-antenna device 20 according to the comparative example shown in FIG.

  In the multi-antenna device 40 corresponding to the third embodiment, the first antenna element 41 and the second antenna element 42 are arranged so that the distance D1 between the first feeding point 14 and the second feeding point 15 is 10 mm. In addition, the first antenna element 11 (second antenna element) is set so that the distance D2 between the first feeding point 14 (second feeding point 15) and the grounding position of the first short-circuit portion 112 (second short-circuit portion 122) is 3 mm. 12) was formed. In addition, the first feeding point connection part 111, the first extension part 413, the first short-circuit part 112, the vicinity of one side of the grounding part 13 where the notch part for reducing mutual coupling is not provided, the second short-circuit part 122. The first antenna element 41 and the first antenna element 41 are arranged so that a distance L2 (see FIG. 3) from the first feeding point 14 to the second feeding point 15 via the second extension part 423 and the second feeding point connection part 121 becomes 26 mm. Two antenna elements 42 were arranged.

  Next, with reference to FIG. 6 and FIG. 13, the characteristic of the S parameter of the multi-antenna apparatus 20 according to the comparative example and the multi-antenna apparatus 40 corresponding to the third embodiment will be described.

  As described above, in the multi-antenna device 20 according to the comparative example, as shown in FIG. 6, S11 was about −24 dB and S21 was about −8 dB at the resonance frequency (2.43 GHz). On the other hand, in the multi-antenna device 40 corresponding to the third embodiment, as shown in FIG. 13, S11 is about −14 dB at the resonance frequency (2.46 GHz) corresponding to the multi-antenna device 30, and S21 Was about -11 dB.

  As a result, the multi-antenna apparatus 40 corresponding to the third embodiment has a smaller value of S21, which means the strength of mutual coupling between the two antenna elements, than the multi-antenna apparatus 20 according to the comparative example. It has been found that the mutual coupling between the antenna elements can be reduced even when the first extension 413 of the antenna element 41 and the second extension 423 of the second antenna element 42 are formed in a meander shape.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above description of the embodiments but by the scope of claims for patent, and further includes all modifications within the meaning and scope equivalent to the scope of claims for patent.

  For example, in the first to third embodiments, the example in which the multi-antenna apparatus of the present invention is applied to a communication device has been shown, but the present invention is not limited to this. For example, the multi-antenna apparatus of the present invention may be applied to devices other than communication devices equipped with a MIMO system, such as wireless LAN and broadband communication.

  Moreover, although the said 1st-3rd embodiment showed the example in which the one side where the feeding point of a grounding part is arrange | positioned was formed in the substantially straight line, this invention is not limited to this. In the present invention, if the notch portion for reducing mutual coupling is not provided on one side where the feeding point of the grounding portion is disposed, it may not be substantially straight. For example, as shown in FIG. 14, the structure by which the unevenness | corrugation which is not effective in reducing a mutual coupling is provided in the one side by which the feeding point of the grounding part 53 of the multi-antenna apparatus 50 is arrange | positioned may be sufficient.

  Moreover, although the said 1st-3rd embodiment showed the example of the structure which does not provide the matching circuit for aiming at impedance matching between a feeding point and an antenna element, this invention is not limited to this. In the present invention, a matching circuit for suppressing mutual coupling between the antenna elements may be provided between the feeding point and the antenna element while impedance matching is performed at a predetermined frequency of the high-frequency power. For example, as shown in FIG. 15, the first matching circuit 17 (first antenna) is provided between the first feeding point 14 (second feeding point 15) and the first antenna element 11 (second antenna element 12) of the multi-antenna device 60. 2 matching circuit 18) may be provided. Thereby, at a predetermined frequency, the mutual coupling between the antenna elements can be reduced and impedance matching can be achieved, so that transmission loss of energy transmitted through the antenna element can be further reduced. The first matching circuit 17 (second matching circuit 18) includes, for example, a matching circuit composed of a π-type circuit (π match) configured by an inductor (coil) and a capacitor (capacitor) as shown in FIG. The configuration includes a T-type circuit (T match) configured by an inductor and a capacitor as shown in FIG. 17, and an L-type circuit (L match) configured by an inductor and a capacitor as shown in FIG. Further, the π-type circuit, the T-type circuit, the L-type circuit, and the like may be configured by only one of the inductor and the capacitor, or may be configured by both the inductor and the capacitor.

  Moreover, in the said 1st-3rd embodiment, although the multi-antenna apparatus for MIMO communication was shown as an example of a multi-antenna apparatus, this invention is not limited to this. In the present invention, for example, a multi-antenna apparatus corresponding to a format other than MIMO such as diversity may be used.

  Moreover, in the said 1st-3rd embodiment, although the example of the structure which provides two antenna elements in a multi-antenna apparatus was shown, this invention is not limited to this. In the present invention, as long as it is a plurality of antenna elements, a configuration in which three or more antenna elements are provided may be employed.

  In the first and second embodiments, the first extension portion of the first antenna element and the second extension portion of the second antenna element are formed in a bent shape. However, the present invention is not limited to this. Not limited to. In the present invention, the portion of the first extension of the first antenna element that extends to the side opposite to the second antenna element and the portion of the second extension of the second antenna element that extends to the side opposite to the first antenna element are curved. It may be formed in the shape.

10, 30, 40, 50, 60 Multi-antenna device 11, 31, 41 First antenna element 12, 32, 42 Second antenna element 13, 53 Grounding part 14 First feeding point 15 Second feeding point 17 First matching circuit 18 Second matching circuit 100 Communication device 111 First feeding point connection part 112 First short-circuiting part 113, 313, 413 First extension part 121 Second feeding point connection part 122 Second short-circuiting part 123, 323, 423 Second extension part

Claims (7)

A grounding part having one side not provided with a notch for reducing mutual coupling;
A first antenna element and a second antenna element arranged to face each other on one side of the ground portion,
The first antenna element extends in a direction intersecting with one side of the grounding portion and has a first feeding point connection portion having one end connected to a first feeding point that supplies high-frequency power on one side of the grounding portion; A first short-circuit portion extending in a direction intersecting with one side of the ground portion and having one end grounded in a region closer to the second antenna element than the first feed point connection portion of one side of the ground portion; A first extension portion that connects the other end of the first short-circuit portion and the other end of the first feed point connection portion and extends to the opposite side of the second antenna element side;
The second antenna element extends in a direction intersecting with one side of the grounding part and has a second feeding point connection part having one end connected to a second feeding point that supplies high-frequency power on one side of the grounding part, Extending in a direction intersecting one side of the grounding portion, one end is grounded in a region closer to the first antenna element than the second feeding point connection portion of one side of the grounding portion, and faces the first short-circuit portion. And a second extension that connects the other end of the second short-circuit part and the other end of the second feed point connection part and extends to the opposite side of the first antenna element side. And a multi-antenna device. The first extension portion has a length greater than that of the first feeding point connection portion and the first short-circuit portion,
2. The multi-antenna apparatus according to claim 1, wherein the second extension portion has a length greater than that of the second feeding point connection portion and the second short-circuit portion.   The first antenna element and the second antenna element are straight lines perpendicular to a straight line connecting the first feeding point and the second feeding point and passing through a midpoint between the first feeding point and the second feeding point. The multi-antenna apparatus according to claim 1, wherein the multi-antenna apparatus is formed in a substantially line-symmetric shape.   The multi of any one of claims 1 to 3, wherein the first short-circuit portion and the second short-circuit portion are disposed substantially perpendicular to one side of the grounding portion and substantially parallel to each other. Antenna device. The portion of the first extension that extends to the side opposite to the second antenna element side is formed in a bent or curved shape,
5. The multi-antenna device according to claim 1, wherein a portion of the second extension portion extending to the side opposite to the first antenna element side is formed in a bent or curved shape. It is arranged between the first antenna element and the first feeding point, and suppresses mutual coupling between the first antenna element and the second antenna element while achieving impedance matching at a predetermined frequency of high-frequency power. A first matching circuit for performing
It is arranged between the second antenna element and the second feeding point, and suppresses mutual coupling between the first antenna element and the second antenna element while achieving impedance matching at a predetermined frequency of high-frequency power. The multi-antenna device according to any one of claims 1 to 5, further comprising a second matching circuit. A communication device including a multi-antenna device,
The multi-antenna device includes a grounding portion having one side not provided with a notch for reducing mutual coupling;
A first antenna element and a second antenna element arranged to face each other on one side of the ground portion,
The first antenna element extends in a direction intersecting with one side of the grounding portion and has a first feeding point connection portion having one end connected to a first feeding point that supplies high-frequency power on one side of the grounding portion; A first short-circuit portion extending in a direction intersecting with one side of the ground portion and having one end grounded in a region closer to the second antenna element than the first feed point connection portion of one side of the ground portion; A first extension portion that connects the other end of the first short-circuit portion and the other end of the first feed point connection portion and extends to the opposite side of the second antenna element side;
The second antenna element extends in a direction intersecting with one side of the grounding part and has a second feeding point connection part having one end connected to a second feeding point that supplies high-frequency power on one side of the grounding part, Extending in a direction intersecting one side of the grounding portion, one end is grounded in a region closer to the first antenna element than the second feeding point connection portion of one side of the grounding portion, and faces the first short-circuit portion. And a second extension that connects the other end of the second short-circuit part and the other end of the second feed point connection part and extends to the opposite side of the first antenna element side. Including communication equipment.

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