KR102529334B1 - MIMO antenna and MIMO antenna apparatus having the same - Google Patents

Abstract

According to the present invention, an MIMO antenna is provided on a shield can to perform grounding and shielding and spaced apart from each other on the shield can, each operates in multiple frequency bands, and includes a plurality of antenna elements having a power feeder and a ground portion. The shield can has a plurality of step portions provided in a downward direction from an upper surface of the shield can, and the lower ends of each of the plurality of antenna elements are mounted on the plurality of step portions. Accordingly, isolation between the plurality of antenna elements is improved without changing a structure of the plurality of antenna elements used in the MIMO antenna.

Description

MIMO antenna and MIMO antenna apparatus including the same {MIMO antenna and MIMO antenna apparatus having the same}

The present invention relates to a MIMO antenna and a MIMO antenna device including the same.

More specifically, the present invention relates to a MIMO antenna with improved isolation between a plurality of antennas and a MIMO antenna device including the same.

Recently, demand for high-quality multimedia services using wireless mobile communication technology is increasing. Accordingly, a next-generation wireless transmission technology for transmitting more data more quickly and with a lower error probability is required.

In response to this demand, a multiple-input multiple-output (MIMO) antenna has been proposed. A MIMO antenna performs multiple input/output operations by arranging a plurality of antenna elements in a special structure. These multiple antenna elements enable high-speed data transmission by receiving different signals.

Accordingly, the data transmission rate can be improved within a specific range. Such a MIMO antenna is a next-generation mobile communication technology that can be widely used in mobile communication terminals and repeaters, and can be said to be a technology that can overcome the transmission limit of mobile communication, which has reached its limit due to the expansion of data communication.

On the other hand, when a MIMO antenna is implemented in a wireless terminal, since two or more antenna elements must be disposed in a small space, it is difficult to improve isolation characteristics between the plurality of antenna elements.

As a solution to this problem, a method of using circular polarization antenna elements in different directions has been proposed, but another problem arises in that the path loss of the circular polarization antenna element having directivity is high.

Therefore, there is a need for a new method capable of maintaining the operation performance of a MIMO antenna and a MIMO antenna device including the MIMO antenna while improving isolation between a plurality of antenna elements used in the MIMO antenna.

Republic of Korea Patent Registration No. 10-0910526 (registration date: 2009.07.27.)

The present invention is to solve the problems of the prior art, and an object of the present invention is to form a plurality of stepped portions on a shield can and mount a plurality of antenna elements, thereby improving the structure of a plurality of antenna elements used in a MIMO antenna. It is to provide a MIMO antenna with improved isolation between a plurality of antenna elements without modification and a MIMO antenna device including the same.

In order to achieve the above object, a MIMO antenna according to an embodiment of the present invention is provided spaced apart from each other on a shield can and the shield can provided for grounding and shielding, each operating in a multi-frequency band, It includes a plurality of antenna elements having a power feeding part and a grounding part, and the shield can has a plurality of stepped parts provided in a downward direction from an upper surface of the shield can, so that the lower end of each of the plurality of antenna elements is the plurality of stepped parts. It is characterized in that it is mounted on the part.

A MIMO antenna and a MIMO antenna device including the same according to an embodiment of the present invention form a plurality of stepped portions on a shield can and mount a plurality of antenna elements on the upper surface of the plurality of stepped portions, thereby improving the structure of the plurality of antenna elements. Without modification, isolation between a plurality of antenna elements can be improved and the overall volume of the MIMO antenna device can be reduced as much as possible.

Effects achieved by the present invention are not limited to the above-described effects, and should be understood to include all effects that can be inferred from the detailed description of the present invention or the configuration of the invention described in the claims.

1 is an exploded perspective view showing a separated configuration of a MIMO antenna device according to an embodiment of the present invention.
2 is a perspective view schematically illustrating a state in which a plurality of antenna elements are mounted on a plurality of stepped portions formed on a shield-can according to an embodiment of the present invention.
FIG. 3 is a schematic view of the plane of FIG. 2 .
4 is a perspective view schematically showing the structure of a first antenna element according to an embodiment of the present invention.
5 is a perspective view schematically showing the structure of a second antenna element according to an embodiment of the present invention.
6 is a diagram for explaining a height range of a stepped portion according to an embodiment of the present invention.
7 is a diagram schematically illustrating a cross section of a MIMO antenna device according to an embodiment of the present invention.
8 is a perspective view schematically illustrating a state in which a first power supply unit and a power supply line are joined in a state in which a first antenna element according to an embodiment of the present invention is mounted on a first step portion of a shield-can.
9 is a perspective view illustratively illustrating a state in which a plurality of stepped portions are omitted on a shield-can according to an embodiment of the present invention.
10 is a graph showing the results of measuring isolation between a pair of first antenna elements and isolation between a pair of second antenna elements in a state in which a stepped portion is omitted on a shield-can according to an embodiment of the present invention.
11 is a graph showing the results of measuring isolation between a pair of first antenna elements and isolation between a pair of second antenna elements in a state where a stepped portion is formed on a shield-can according to an embodiment of the present invention.
12 shows the results of measuring the voltage standing-wave ratio between a pair of first antenna elements and the voltage standing-wave ratio between a pair of second antenna elements in a state in which a stepped portion is omitted on a shield-can according to an embodiment of the present invention. it's a graph
13 is a graph showing results of measuring a voltage standing wave ratio between a pair of first antenna elements and a voltage standing wave ratio between a pair of second antenna elements in a state in which a stepped portion is formed on a shield can according to an embodiment of the present invention. am.

Hereinafter, a preferred embodiment according to the present invention will be described in detail with reference to the accompanying drawings. It should be noted that in the accompanying drawings, the same components are indicated by the same reference numerals as much as possible. In addition, detailed descriptions of well-known functions and configurations that may obscure the gist of the present invention will be omitted.

1 is an exploded perspective view showing the configuration of a MIMO antenna device according to an embodiment of the present invention in isolation, and FIG. 2 is a plurality of antenna elements formed on a plurality of steps formed on a shield can according to an embodiment of the present invention. It is a perspective view schematically showing the mounted state, and FIG. 3 is a view schematically showing the plane of FIG. 2 .

4 is a perspective view schematically showing the structure of a first antenna element according to an embodiment of the present invention, and FIG. 5 is a perspective view schematically showing the structure of a second antenna element according to an embodiment of the present invention, 6 is a diagram for explaining a height range of a stepped portion according to an embodiment of the present invention.

7 is a diagram schematically showing a cross section of a MIMO antenna device according to an embodiment of the present invention, and FIG. 8 is a first antenna element according to an embodiment of the present invention mounted on a first stepped portion of a shield-can. In the state, it is a perspective view schematically showing a joined state between the first power supply and the power supply line.

1 to 8, the MIMO antenna 100 according to an embodiment of the present invention is provided spaced apart from each other on a shield can 110 provided for grounding and shielding and the shield can 110, Each operates in a multi-frequency band, includes a plurality of antenna elements 120 and 130 having a power supply part and a ground part, and the shield can 110 includes a plurality of antenna elements provided in a downward direction from the upper surface of the shield can 110. It is characterized in that the stepped portions 111 and 112 are provided, and the lower ends of each of the plurality of antenna elements 120 and 130 are mounted on the plurality of stepped portions 111 and 112. At this time, the stepped parts 111 and 112 may be located at a height lower than the height of the central axis CP of the shield can 110 .

In addition, the MIMO antenna device 200 according to an embodiment of the present invention may include the above-described MIMO antenna 100 and the printed circuit board 210.

Hereinafter, a specific configuration and operation of the MIMO antenna 100 according to an embodiment of the present invention will be described in detail.

2 to 5, the MIMO antenna 100 according to an embodiment of the present invention is provided spaced apart from each other on a shield can 110 and a shield can 110 provided for grounding and shielding, respectively. A plurality of antenna elements 120 and 130 operating in this multi-frequency band may be included.

The shield can 110 can ground the plurality of antenna elements 120 and 130 and at the same time electromagnetically shield EMI generated from electronic components on the printed circuit board 210 disposed under the shield can 110. there is.

The shield can 110 may provide a space in which the plurality of antenna elements 120 and 130 are disposed. As shown in FIG. 2 , a case in which the planar shape of the shield can 110 is a square is exemplified, but it should be noted that the present invention is not limited thereto.

The shield can 110 may be made of a metallic material so that the plurality of antenna elements 120 and 130 can be grounded. For example, the shield can 110 may be made of aluminum, molybdenum, copper, titanium or an alloy thereof. A plurality of antenna elements 120 and 130 to be described later may be directly disposed on the shield can 110.

The plurality of antenna elements 120 and 130 may be disposed at intervals rotated by 90 degrees in a clockwise direction at each corner with respect to the central axis CP of the shield-can 110 .

Referring to FIG. 2, the plurality of antenna elements 120 and 130 include a pair of first antenna elements 120 resonating in a first frequency band and a pair of second antenna elements resonating in a second frequency band different from the first frequency band. (130).

More specifically, each of the pair of first antenna elements 120 may be arranged symmetrically with an interval rotated by 180 degrees with respect to the central axis CP of the shield can 110, and may receive a wireless communication signal or can be sent For example, the pair of first antenna elements 120 may capture a wireless communication signal transmitted through a free space such as air.

Referring to FIG. 4 together with FIGS. 2 and 3 , each of the pair of first antenna elements 120 according to an embodiment of the present invention includes a first radiator 121 and a first protruding from the first radiator 121 . The power supply unit 122 and the first ground unit 123 protruding from the first radiator 121 may be included.

The first radiator 121 may radiate and/or resonate with high frequency. That is, the first radiator 121 may receive and/or transmit a wireless communication signal. A power supply signal may be applied to the first radiator 121 through the first power supply unit 122 . The first radiator 121 may be formed of a conductive material. For example, the first radiator 121 may be made of aluminum, molybdenum, copper, titanium, or an alloy thereof.

In this embodiment, it is suggested that the first radiator 121 has a substantially rectangular shape on a plane, but it should be noted that the present embodiment is not limited thereto.

Meanwhile, in some embodiments, a predetermined pattern or slit may be formed in the first radiator 121 . Alternatively, the vicinity of the vertex of the first radiator 121 may be in a chamfered state.

The first power supply unit 122 may protrude and extend from the first radiator 121 . A power supply signal provided through a power supply line 140 described later may be transmitted and received through the first power supply unit 122 .

The first power supply unit 122 may extend from the first radiator 121 and may have a shape bent substantially downward. At this time, the first power supply unit 122 may be formed to be spaced apart from the upper surface of the first stepped unit 111 formed on the shield can 110 by a predetermined interval.

The first ground unit 123 may be disposed on the same side as the first power supply unit 122 . The first ground portion 123 may protrude and extend from the first radiator 121 . The first ground portion 123 may be electrically connected to a predetermined ground, for example, an upper surface of the first stepped portion 111 of the shield can 110 .

The first ground portion 123 may extend from the first radiator 121 and may be substantially bent downward. At this time, a first ground mounting portion 123a for mounting the first antenna element 120 to the first stepped portion 111 of the shield-can 110 may be provided below the first ground portion 123 .

Each of the pair of second antenna elements 130 according to an embodiment of the present invention is disposed symmetrically with an interval rotated by 180 degrees with respect to the central axis CP of the shield can 110, and the pair of first antenna elements 130 are arranged symmetrically. Each may be disposed between the elements 120 . The pair of second antenna elements 130 may receive or transmit wireless communication signals. In this case, the second antenna element 130 may receive or transmit a wireless communication signal of a different frequency band from the pair of first antenna elements 120 .

That is, the pair of second antenna elements 130 may resonate in a different frequency band from the pair of first antenna elements 120 . For example, the pair of first antenna elements 120 may be low band antenna elements that resonate in a low frequency band of 700 MHz to 900 MHz, which is the first frequency band, and the pair of second antenna elements 130 may be a high band antenna element that resonates in a high frequency band of 1700 MHz to 2100 MHz, which is the second frequency band.

Referring to FIG. 5 together with FIGS. 2 and 3 , each of the pair of second antenna elements 130 according to an embodiment of the present invention, like the pair of first antenna elements 120, includes a second radiator 131 and a second antenna element 130. 2 may include a second power supply unit 132 protruding from the radiator 131 and a second ground unit 133 protruding from the second radiator 131 .

Each configuration of the second radiator 131, the second feeding part 132, and the second grounding part 133 of the pair of second antenna elements 130 according to an embodiment of the present invention is Only the respective configurations and structural shapes of the first radiator 121, the first grounding unit 123, and the second feeding unit 132 of the antenna element 120 are different, and the same functions are performed, so detailed descriptions are omitted. .

Meanwhile, similarly to the first grounding portion 123, the second antenna element 130 is mounted on the second stepped portion 112 of the shield-can 110 at the bottom of the second contacting portion. A second ground mounting portion 133a may be provided for this.

Therefore, a wireless communication network used in multiple bands can be constructed by including a pair of first antenna elements 120 and a pair of second antenna elements 130 in which the plurality of antenna elements 120 and 130 resonate in different frequency bands. there is.

Meanwhile, the plurality of antenna elements 120 and 130 radiate signals into the air, and a signal radiated from one antenna element may flow into another antenna element. That is, mutual interference may occur during operation of each antenna element, and this phenomenon may equally occur during signal reception.

According to an embodiment of the present invention, a plurality of stepped portions 111 and 112 may be formed on the shield can 110 in order to improve interference between elements of the plurality of antennas 120 and 130 .

More specifically, the shield can 110 includes a plurality of stepped portions 111 and 112 provided from the upper surface of the shield can 110 in a downward direction, so that some of the signals radiated from the plurality of antenna elements 120 and 130 are transmitted. It can be prevented from being directed to a plurality of antenna elements 120 and 130 that are close to each other.

Lower ends of each of the plurality of antenna elements 120 and 130 may be mounted on the plurality of step portions 111 and 112, respectively.

In this embodiment, it is suggested that the plurality of step portions 111 and 112 are respectively formed at the corners of the shield-can 110, but it should be noted that the present embodiment is not limited thereto.

In this embodiment, the plurality of stepped portions 111 and 112 are suggested to be formed in an approximate 'B' shape so that the first ground mounting portion 123a and the second ground mounting portion 133a can be mounted, but is not limited thereto. point should be noted. For example, it may be formed in various shapes according to the shape of the ground mounting parts 123a and 133a of the respective ground parts 123 and 133 provided in the plurality of antenna elements 120 and 130 .

The plurality of stepped portions 111 and 112 according to an embodiment of the present invention are preferably formed within a height range of 0.25 to 0.83 from the upper surface of the shield-can 110 with respect to the total height 1 of the shield-can 110 .

Referring to FIG. 6, an example in which the first antenna element 120 is mounted on the first stepped portion 111 to be described later will be described in more detail. In this case (see FIG. 8), the minimum height of 2 mm that can mount the first antenna element 120 on the first stepped portion 111 on the shield can 110 by the screw S, which is a separate fastening member, have to secure Considering the mounting height, the range of the height H2 at which the first stepped portion 111 can be formed on the shield can 110 is 3 mm to 10 mm.

On the other hand, when the height H2 of the first stepped portion 111 is formed to be 3 mm, it may be a minimum height capable of improving isolation between the plurality of antenna elements 120 and 130, and the height of the first stepped portion 111 When the height is 10 mm, it may be a height capable of maximally improving isolation performance between the plurality of antenna elements 120 and 130.

In addition, referring to the portion shown by the dotted line in FIG. 6 , the case where the first antenna element 120 is mounted on the first stepped portion 111 and the upper surface of the shield-can 110 when the first antenna element 120 is As the height of the first antenna element 120 is lowered by 3 mm to 10 mm compared to the case where it is mounted on, it is possible to secure a mounting space for other components and further reduce the overall height of the MIMO antenna device. .

The plurality of stepped portions 111 and 112 according to an embodiment of the present invention include a pair of first stepped portions 111 to which a pair of first antenna elements 120 are mounted and a pair of second antenna elements 130 to which they are mounted. A pair of second stepped portions 112 may be included.

The pair of first stepped parts 111 may be disposed at symmetrical positions with respect to the central axis CP of the shield can 110, and the pair of second stepped parts 112 are They may be disposed at symmetrical positions with respect to the central axis CP.

In this case, the pair of second stepped portions 112 may be respectively disposed between the pair of first stepped portions 111 in a clockwise direction from the central axis CP of the shield-can 110 .

As a result, the pair of first step portions 111 and the pair of second step portions 112 are alternately arranged at intervals rotated by 90 degrees clockwise with respect to the central axis CP of the shield can 110 With this arrangement structure, the pair of first stepped portions 111 on the shield can 110 are disposed at symmetrical positions at intervals rotated by 180 degrees with respect to the central axis CP of the shield can 110. And, the pair of second stepped parts 112 are disposed at symmetrical positions with an interval rotated by 180 degrees with respect to the central axis CP of the shield can 110.

The pair of first antenna elements 120 according to an embodiment of the present invention may be arranged so that their longitudinal surfaces (M1, see FIG. 4) face each other, and the pair of second antenna elements 130 may be arranged in the longitudinal direction. The surfaces (M2, see FIG. 5) of may be disposed facing each other. In this case, the longitudinal plane M1 of the pair of first antenna elements 120 is disposed perpendicular to the longitudinal plane M2 of the pair of second antenna elements 130 .

More specifically, the longitudinal surfaces M1 of the pair of first radiators 121 constituting the upper portions of the pair of first antenna elements 120 may be disposed facing each other, and the pair of second antenna elements 130 ) may be disposed facing each other. In this case, the longitudinal surface M1 of the pair of first radiators 121 is disposed perpendicular to the longitudinal surface M2 of the pair of second radiators 131 .

As described above, a state in which the pair of first radiators 121 are disposed facing each other in the diagonal direction and the pair of second radiators 131 are disposed facing each other in the diagonal direction between the pair of first radiators 121 , when the longitudinal planes M1 of the pair of first radiators 121 are perpendicular to the longitudinal planes M2 of the pair of second radiators 131, the longitudinal planes of the plurality of radiators may be any one Since it does not face the longitudinal plane of the radiator, the effect of radiation is reduced, so that isolation between the plurality of antenna elements 120 and 130 can be further improved.

The MIMO antenna 100 according to an embodiment of the present invention may further include a plurality of feed lines 140 connected to each of the plurality of antenna elements 120 and 130 . The plurality of feed lines 140 may provide feed signals to the feed parts 122 and 132 of the plurality of antenna elements 120 and 130, respectively. The plurality of power supply lines 140 may be coaxial cables. The plurality of power supply lines 140 may be electrically connected to the power supply units 122 and 132 of the plurality of antenna elements 120 and 130, respectively. For example, the plurality of power supply lines 140 may be electrically connected to each of the power supply units 122 and 132 through a method such as ground soldering.

Bonding between the plurality of antenna elements 120 and 130 and the power supply units 122 and 123 by ground soldering makes the MIMO antenna 100 a Planar Inverted-F Antenna (PIFA) type antenna provided in a mobile communication device. While implementing, it may be to secure an effective volume of the plurality of antenna elements 120 and 130, that is, a space for radiation.

Meanwhile, although not shown in detail, the coaxial cable may include a center conductor, an outer conductor, an insulator disposed between the center conductor and the outer conductor, and a sheath disposed outside the outer conductor.

Referring to FIG. 8, an example of a process in which the first antenna element 120 and the feeding line 140 are joined by soldering is described in detail. The central conductor for transmitting signals in the feeding line 140 is An external conductor bonded to the end of the power supply unit 122 by soldering and disposed outside the insulator of the power supply line 140 may be bonded and fixed to the first ground mounting unit 123a by soldering.

That is, as the feed line 140 is double bonded and fixed to the first feed part 122 and the first ground mounting part 123a, the joint stability between the first antenna element 120 and the feed line 140 can be improved. there will be

The plurality of antenna elements 120 and 130 according to an embodiment of the present invention may be mounted on the upper surface of the plurality of stepped portions through screws S, which are separate fastening members, but it should be noted that the present invention is not limited thereto.

At this time, a fastening hole S through which a screw S passes may be formed on each of the ground long side parts 122a and 132a of each of the ground parts 122 and 132 of the plurality of antenna elements 120 and 130, respectively.

The MIMO antenna device 200 according to an embodiment of the present invention may further include a printed circuit board 210 provided on the lower side of the shield can 110 .

At this time, on the printed circuit board 210, for example, electronic components 211 for operating various functions of the mobile communication terminal may be mounted.

Referring back to FIG. 7 , the lower surface of the shield can 110 according to an embodiment of the present invention is retracted from the plurality of stepped portions 111 and 112, and the electronic components mounted on the lower surface of the shield can 110 and the printed circuit board. An avoidance groove 113 for avoiding interference between the cells may be provided.

MIMO antenna device 200 according to an embodiment of the present invention is provided on the lower side of the printed circuit board 210 may be provided with a base 220 provided with an internal space for receiving and supporting the printed circuit board 210 there is. In addition, a cover 230 coupled to the base 220 may be provided on the upper side of the shield can 110 .

9 is a perspective view exemplarily showing a state in which a plurality of stepped portions are omitted on a shield-can according to an embodiment of the present invention, and FIG. 10 is a state in which a stepped portion is omitted on a shield-can according to an embodiment of the present invention. A pair in is a graph showing the results of measuring the degree of isolation between the first antenna elements and the degree of isolation between the pair of second antenna elements, respectively. is a graph showing the results of measuring the degree of isolation between a pair of first antenna elements and the degree of isolation between a pair of second antenna elements, respectively. is a graph showing the results of measuring a voltage standing wave ratio (VSWR) between a pair of first antenna elements and a voltage standing wave ratio between a pair of second antenna elements, respectively, and FIG. It is a graph showing the results of measuring the voltage standing wave ratio between a pair of first antenna elements and the voltage standing wave ratio between a pair of second antenna elements, respectively, in a state in which a stepped portion is formed on the shield-can according to FIG.

At this time, the isolation and voltage standing wave ratio between the pair of first antenna elements 120 are the results of measurement in the low band band of 800 MHz, and the isolation degree and voltage standing wave ratio between the pair of second antenna elements 130 are measured in the high band band of 1850 MHz. This is the result measured in

First, referring to FIGS. 10 and 11 together with FIGS. 2 and 9, especially referring to the L1 curve of FIG. 10 and the L2 curve of FIG. 11, in the low band between a pair of first antenna elements 120 at 800 MHz The degree of isolation is approximately -24.67 dB when the first stepped portion 111 is omitted on the shield-can 110, and -30.55 dB when the first stepped portion 111 is formed on the shield-can 110. You can check.

Accordingly, it can be confirmed that the isolation between the pair of first antenna elements 120 is improved by approximately -5.88 dB in the low band of 800 MHz by the first stepped portion 111 .

In addition, referring to the L3 curve of FIG. 10 and the L4 curve of FIG. 11 , the degree of isolation between the pair of second antenna elements 130 in the high band band of 1850 MHz is determined by the second stepped portion 112 on the shield-can 110. It can be seen that the omitted case is approximately -24.24dB, and the case where the second stepped portion 112 is formed on the shield can 110 is approximately -25.76dB.

Accordingly, it can be seen that the isolation between the pair of second antenna elements 130 is improved by approximately -1.52 dB in the high band band of 1850 MHz by the second stepped portion 112 .

12 and 13 together with FIGS. 2 and 9, but particularly referring to the L5 curve of FIG. 12 and the L6 curve of FIG. 13, the voltage standing wave between the pair of first antenna elements 120 at 800 MHz It can be confirmed that the ratio VSWR is approximately 2.49 when the first stepped portion 111 is omitted on the shield can 110 and is 2.52 when the first stepped portion 111 is formed on the shield can 110. can

In addition, referring to the L7 curve of FIG. 12 and the L8 curve of FIG. 13, the voltage standing wave ratio (VSWR) in the high band band of 1850 MHz between the pair of second antenna elements 130 is the second step on the shield can 110. It can be seen that the case where the portion 112 is omitted is approximately 1.37, and the case where the second stepped portion 112 is formed on the shield-can 110 is approximately 1.48.

Therefore, the voltage standing wave ratio (VSWR) between the pair of first antenna elements 120 and the pair of second antenna elements 130 is the same as when the plurality of step portions 111 and 112 are removed on the shield-can 110 and the shield-can It can be seen that the case where a plurality of step portions 111 and 112 are formed on (110) maintains almost the same performance.

As a result, as the plurality of antenna elements 120 and 130 according to an embodiment of the present invention are mounted on the plurality of step portions 111 and 112 on the shield can 110, the voltage standing wave ratio (VSWR) maintains the same level while maintaining the same level. It can be seen that the isolation of the low band between the first antenna elements 120 of is greatly improved.

As described above, the MIMO antenna and the MIMO antenna device including the MIMO antenna according to an embodiment of the present invention form a plurality of stepped portions on a shield-can and mount a plurality of antenna elements on the upper surface of the plurality of stepped portions, thereby providing a plurality of Without changing the structure of the antenna element, isolation between a plurality of antennas can be improved and the overall volume of the MIMO antenna device can be reduced as much as possible.

Although the embodiments of the present invention have been described above, the scope of protection of the present invention is not necessarily limited thereto, and modifications and variations can be made without limitation within the scope of the technical idea of the present invention.

100: MIMO antenna 110: shield can
111: first stepped portion 112: second stepped portion
113: avoidance groove 120: first antenna element
121: first radiator 122: first power supply unit
123: first ground portion 123a: first ground mounting portion
130: second antenna element 131: second radiator
132: second feeding part 133: second grounding part
133a: second ground mounting portion 140: power supply line
200: MIMO antenna device 210: printed circuit board
220: base 230: cover

Claims (13)

In the MIMO antenna,
Shield can provided for grounding and shielding; and
A plurality of antenna elements provided on the shield can spaced apart from each other, each operating in a multi-frequency band, and having a power feeding unit and a grounding unit.
including,
The shield can includes a plurality of stepped portions provided downwardly from an upper surface of the shield can, and lower ends of each of the plurality of antenna elements are mounted on the plurality of stepped portions;
An avoidance groove is provided on the lower surface of the shield can to avoid interference between components installed on the lower surface of the shield can and the printed circuit board of the MIMO antenna device by being drawn in from the plurality of stepped portions.
MIMO antenna. According to claim 1,
The plurality of antenna elements are MIMO antennas in which the bottom surface of each grounding part is fixed to the plurality of stepped parts through a separate fastening member to the upper surface of the plurality of stepped parts. According to claim 1,
The MIMO antenna is disposed to be spaced apart from the upper surface of the plurality of stepped portions by a predetermined interval. According to claim 1,
The MIMO antenna further comprises a plurality of feed lines for supplying feed signals to the feed parts of the plurality of antenna elements, wherein the plurality of feed lines are respectively connected to the plurality of feed parts. According to any one of claims 1 to 4,
The shield can is formed to have a rectangular shape, and the plurality of stepped portions are formed at corners of the shield can. According to claim 5,
The plurality of step portions are formed within a height range of 0.25 to 0.83 from the upper surface of the shield-can with respect to the total height 1 of the shield-can. According to claim 5,
The plurality of antenna elements include a pair of first antenna elements resonating in a first frequency band and a pair of second antenna elements resonating in a second frequency band different from the first frequency band,
The plurality of stepped portions
a pair of first stepped portions to which the pair of first antenna elements are mounted; and
A pair of second stepped portions to which the pair of second antenna elements are mounted
A MIMO antenna comprising a. According to claim 7,
The pair of second stepped portions are respectively disposed between the pair of first stepped portions in a clockwise direction from the central axis of the shield-can. According to claim 8,
The pair of first stepped parts are disposed at symmetrical positions with respect to the central axis of the shield-can, and the pair of second stepped parts are disposed at symmetrical positions with respect to the central axis of the shield-can. According to claim 9,
The pair of first antenna elements are arranged with longitudinal surfaces facing each other, and the pair of second antenna elements are arranged with longitudinal surfaces facing each other. According to claim 10,
A surface of the pair of first antenna elements in the longitudinal direction is disposed perpendicular to a surface of the pair of second antenna elements in the longitudinal direction. In the MIMO antenna device including the MIMO antenna according to claim 1,
MIMO antenna device further comprising the printed circuit board. According to claim 12,
A base having an internal space for receiving and supporting the printed circuit board is provided on the lower side of the printed circuit board,
A MIMO antenna device provided with a cover coupled to the base on the upper side of the shield can.

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