KR101166089B1 - Multi band mimo antenna - Google Patents

Multi band mimo antenna Download PDF

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Publication number
KR101166089B1
KR101166089B1 KR20100096977A KR20100096977A KR101166089B1 KR 101166089 B1 KR101166089 B1 KR 101166089B1 KR 20100096977 A KR20100096977 A KR 20100096977A KR 20100096977 A KR20100096977 A KR 20100096977A KR 101166089 B1 KR101166089 B1 KR 101166089B1
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South Korea
Prior art keywords
pattern
antenna
formed
ground
feed
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KR20100096977A
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Korean (ko)
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KR20120035459A (en
Inventor
류병훈
성원모
최재훈
한민석
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주식회사 이엠따블유
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Abstract

A multi band MIMO antenna is disclosed. Multi-band MIMO antenna according to an embodiment of the present invention, the parasitic patch connected to the ground on the substrate, the capacitive coupling feed pattern is formed spaced apart from each other and the coupling is formed with the parasitic patch, respectively. It includes and comprises a first antenna and a second antenna formed to be spaced apart from each other. In this case, the parasitic patch is fed through a coupling with the capacitively coupled feed pattern.

Description

MULTI BAND MIMO ANTENNA

Embodiments of the present invention relate to a multi-in multi-out (MIMO) antenna, and more particularly, to a multi-band MIMO antenna technology with improved isolation between antennas.

Recently, with the rapid development of wireless communication technology, research on the antenna of a mobile communication terminal suitable for it has been continuously conducted. In particular, MIMO (Multi Input Multi Output) antenna system is attracting attention to improve antenna performance of mobile communication terminals. In 4G mobile communication, MIMO antenna system technology is adopted to improve communication speed and increase data capacity. .

MIMO antenna system is a multi-antenna signal processing method for transmitting and receiving data using a plurality of antennas in a wireless communication environment, by using two antennas to transmit two or more data signals in the same wireless channel to extend the range of wireless communication, Speed also has the advantage of greatly improving. That is, in the MIMO antenna system, a plurality of antennas may be arranged to increase the amount and reliability of data.

However, when the MIMO antenna system is used in the mobile communication terminal, due to the spatial constraints of the mobile communication terminal, mutual interference occurs between antennas, thereby reducing isolation, thereby degrading antenna performance. There is this.

In other words, in order to prevent performance degradation between antennas in a MIMO antenna system, spaces of 0.5λ or more are required. In a mobile communication terminal, interference is generated between antennas due to spatial constraints, and isolation is reduced, and capacity efficiency of the MIMO antenna system is reduced. This decreasing problem occurs.

In order to solve this problem, a method of minimizing mutual interference between antennas has been attempted by forming a partition of a three-dimensional structure between antennas arranged on a substrate or by using a modified ground structure.

However, this method does not meet the trend of miniaturization of mobile communication terminals because it increases the volume of the MIMO antenna, and has a problem that it can be applied only in a single frequency band.

Embodiments of the present invention provide a multi-band MIMO antenna that can improve isolation by minimizing interference between antennas.

Embodiments of the present invention provide a multi-band MIMO antenna capable of miniaturizing the size of the antenna and at the same time maintaining the performance as a MIMO antenna.

Multi-band MIMO antenna according to an embodiment of the present invention, the substrate; A ground formed on the substrate; And a first antenna and a second parasitic patch connected to the ground, and a capacitively coupled feeding pattern formed to be spaced apart from each other and the parasitic patch and the parasitic patch. And an antenna, wherein the parasitic patch is fed through coupling with the capacitively coupled feed pattern.

According to embodiments of the present invention, by using a method in which the parasitic patch is fed by coupling with the capacitive coupling pattern, the size of each antenna can be miniaturized and each antenna can have a wide frequency bandwidth characteristic. In addition, it is possible to improve the isolation characteristics by minimizing mutual interference between each antenna.

In addition, since a multi-band MIMO antenna is formed on a substrate on a plane and does not require a separate structure for improving isolation, the antenna can be reduced in volume, thereby miniaturizing the antenna, You can save time.

1 illustrates a multi-band MIMO antenna in accordance with an embodiment of the present invention.
2 is a graph showing return loss (S11) and isolation (S21) of a multi-band MIMO antenna according to an embodiment of the present invention.
3 is an equivalent circuit diagram of a multi-band MIMO antenna according to an embodiment of the present invention.
4 is a diagram showing specific design parameters of a multi-band MIMO antenna according to an embodiment of the present invention.
5 is a graph showing the return loss according to the length (L3) of the termination pattern in one embodiment of the present invention.
FIG. 6 is a graph showing the return loss according to the distance G between the second feed line and the coupling pattern in one embodiment of the present invention. FIG.
7 is a graph showing the return loss according to the distance D2 between the first feed line and the ground connection pattern in one embodiment of the present invention.

Hereinafter, specific embodiments of the multi-band MIMO antenna of the present invention will be described with reference to FIGS. 1 to 7. However, this is only an exemplary embodiment and the present invention is not limited thereto.

In the following description, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. The following terms are defined in consideration of the functions of the present invention, and may be changed according to the intention or custom of the user, the operator, and the like. Therefore, the definition should be based on the contents throughout this specification.

The technical spirit of the present invention is determined by the claims, and the following embodiments are merely means for effectively explaining the technical spirit of the present invention to those skilled in the art to which the present invention pertains.

1 is a diagram illustrating a multi-band MIMO antenna according to an embodiment of the present invention.

Referring to FIG. 1, a multi band MIMO antenna 100 includes a substrate 102, a ground 104, a first antenna 106, and a second antenna 108. Here, the first antenna 106 and the second antenna 108 are formed symmetrically. Therefore, hereinafter, only the configuration of the first antenna 106 will be described, and a detailed description of the configuration of the second antenna 108 will be omitted.

The ground 104 is formed to have a predetermined area at the lower end of the substrate 102, and the first antenna 106 and the second antenna 108 are formed at the upper end of the substrate 102. And are connected to each other.

The first antenna 106 includes a capacitively coupled feed pattern 110 and a parasitic patch 120. The capacitively coupled feed pattern 110 transmits and receives signals in the 3.4 to 3.6 GHz band, for example, the M-WiMAX band. The parasitic patch 120 transmits and receives a signal of 2.4 GHz, for example, a WLAN band. Here, the frequency bandwidth of the parasitic patch 120 is widened by electromagnetic coupling between the capacitive coupling feeding pattern 110 and the parasitic patch 120. A detailed description thereof will be given later.

In this case, the parasitic patch 120 can transmit and receive signals in the 2.5 to 2.69 GHz band, which is the M-WiMAX band, as well as 2.4 GHz, which is the WLAN band, and 5.2 GHz and 5.8, which are multiplication frequencies of the 2.5 to 2.69 GHz band. Signals in the GHz band (which is the WLAN band) can also be transmitted and received. That is, the first antenna 106 transmits and receives signals of multiple bands such as 2.4 GHz, 2.5 to 2.69 GHz, 3.4 to 3.6 GHz, 5.2 GHz, and 5.8 GHz. In summary, the first antenna 106 can transmit and receive signals in both WLAN bands (2.4 GHz, 5.2 GHz and 5.8 GHz) and M-WiMAX bands (2.5 to 2.69 GHz and 3.4 to 3.6 GHz).

The capacitively coupled feed pattern 110 is spaced apart from the ground 104 at a predetermined interval, and is formed at the end of the first feed line 112 and the first feed line 112 which are formed perpendicular to the ground 104. And a second feed line 114 connected to the first feed line 112. As such, the capacitive coupling feed pattern 110 may be formed, for example, in an L shape.

A feed point 130 is formed in a space between the ground 104 and the first feed line 112. The feed point 130 is electrically connected to, for example, a coaxial cable (not shown). In this case, a ground terminal of the coaxial cable (not shown) is connected to the ground 104, and a feed terminal of the coaxial cable (not shown) is connected to the first feed line 112. In this case, the capacitively coupled feed pattern 110 receives current through the feed point 130.

The parasitic patch 120 includes a ground connection pattern 122, a coupling pattern 124, and a termination pattern 126. The ground connection pattern 122 is formed to be vertically connected to the ground 104 in the ground 104. Here, the ground connection pattern 122 is formed parallel to the first feed line 112 spaced apart from each other. At this time, the capacitance between the ground connection pattern 122 and the first feed line 112 between the ground connection pattern 122 and the first feed line 112 so as to ignore the capacitance component generated by the coupling The interval must be adjusted.

The coupling pattern 124 is formed to be vertically connected to the ground connection pattern 122 at the end of the ground connection pattern 122. In this case, the coupling pattern 124 is spaced apart from the second feed line 114 by a predetermined interval and formed in parallel.

Here, when the capacitively coupled feed pattern 110 receives current through the feed point 130, the coupling occurs between the second feed line 114 and the coupling pattern 124. Feeding is made to the parasitic patch 120. That is, the parasitic patch 120 is fed by the capacitive coupling feeding method, not the direct feeding method.

In this case, the resonance frequency of the first antenna 106 may be lowered by the capacitance component due to the coupling between the coupling pattern 124 and the second feed line 114, thereby causing the first antenna to be lowered. 106 can be downsized. That is, since the electrical length of the first antenna 106 can be reduced by the capacitance component due to the coupling, the first antenna 106 can be miniaturized.

In addition, since the resonance of the parasitic patch 120 and the resonance of the capacitively coupled feed pattern 110 are electromagnetically coupled to form two resonance points, the parasitic patch 120 has a wide frequency bandwidth characteristic. In particular, the parasitic patch 120 is capable of transmitting and receiving signals in the 2.5 to 2.69 GHz band of the M-WiMAX band as well as the 2.4 GHz WLAN band due to the wide frequency band characteristics. Signals in the 5.2 GHz and 5.8 GHz bands (which are WLAN bands), which are multiplied frequencies, can also be transmitted and received.

The termination pattern 126 is formed perpendicularly to the coupling pattern 124 from the end of the coupling pattern 124 to the lower portion of the coupling pattern 124. In this case, the termination pattern 126 is formed to be parallel to the ground connection pattern 122, and the length of the termination pattern 126 determines the overall length of the parasitic patch 120. As such, the parasitic patch 120 may be formed, for example, in a C shape to surround the capacitive coupling feed pattern 110.

2 is a graph showing return loss (S11) and isolation (S21) of a multi-band MIMO antenna according to an embodiment of the present invention.

Referring to FIG. 2, the multi-band MIMO antenna 100 shows that resonance occurs at 2.4 GHz, which is a WLAN band, 2.5 to 2.69 GHz, 3.4 to 3.6 GHz, which is a WLAN band, and 5.2 GHz and 5.8 GHz, which are WLAN bands. Able to know. As such, the multi-band MIMO antenna 100 can be seen that the resonance occurs in the various frequency bands, which has a wide frequency bandwidth characteristics by the electromagnetic coupling between the capacitive coupling feed pattern 110 and the parasitic patch 120 Is the result.

In addition, the multi-band MIMO antenna 100 can be seen that the isolation (S21) is greater than -10 dB in each frequency band, the multi-band MIMO antenna 100 forms a separate structure and device for improving the isolation It can be seen that each antenna exhibits a degree of isolation that can operate normally without doing so. In particular, the 3.4 ~ 3.6 GHz, 5.2 GHz and 5.8 GHz band shows a good isolation characteristic of about -20 dB.

That is, the multi-band MIMO antenna 100 by using a capacitively coupled feeding method can be reduced in size of each antenna, each antenna can have a wide frequency bandwidth characteristics, minimizing mutual interference between each antenna Therefore, the isolation property can be improved. In this case, the multi-band MIMO antenna 100 can satisfy the diversity performance as the MIMO antenna.

In addition, since the multi-band MIMO antenna 100 is formed on the substrate 102 on a plane, and does not require a separate structure for improving isolation, the antenna can be reduced in volume, thereby miniaturizing the antenna, The cost and time according to the manufacture of the antenna can be reduced.

3 illustrates an equivalent circuit of a multi-band MIMO antenna according to an embodiment of the present invention.

Referring to FIG. 3, C1 represents capacitance due to coupling between the parasitic patch 120 and the capacitive coupling feed pattern 110, and L1 represents the parasitic patch 120 connected to the ground 104. Inductance is shown. Z 0 and β TL represent impedance components of the antennas 106 and 108 including the capacitively coupled feed pattern 110. In this case, the antennas can be miniaturized by lowering the resonant frequencies of the antennas 106 and 108 due to the C1.

4 is a diagram showing specific design parameters of a multi-band MIMO antenna according to an embodiment of the present invention.

Referring to FIGS. 1 and 4, the width Wg and the length Lg of the substrate 102 are 25 mm and 66 mm, respectively, and the gap G between the second feed line 114 and the coupling pattern 124 is 0.5. The length L1 of the ground connection pattern 122 was 10 mm, the length L2 of the coupling pattern 124 was 8 mm, and the length L3 of the termination pattern 126 was 6 mm. In addition, the distance D1 between the first antenna 106 and the second antenna 108 is 9 mm, and the distance D2 between the first feed line 112 and the ground connection pattern 122 is 2 mm.

Here, L3, which is the length of the termination pattern 126, G, which is an interval between the second feed line 114 and the coupling pattern 124, and the first feed line 112 and the ground connection pattern ( D2, which is an interval between 122, is an important design parameter, and can be adjusted to adjust frequency bandwidth and impedance matching characteristics of each antenna. Hereinafter, this will be described with reference to FIGS. 5 to 7.

5 is a graph showing the reflection loss according to the length (L3) of the termination pattern in an embodiment of the present invention.

Referring to FIG. 5, as the length L3 of the termination pattern 126, which determines the overall length of the parasitic patch 120, increases from 4 mm to 6 mm, the resonance frequency decreases in the 2.4 GHz band and the 2.5 to 2.69 GHz band. It can be seen that the bandwidth narrows, and in the 3.4 to 3.6 GHz, 5.2 GHz, and 5.8 GHz bands, the resonant frequency increases and the frequency bandwidth widens. In addition, when the length L3 of the termination pattern 126 is 5 mm, it can be seen that the impedance matching characteristic is the best.

FIG. 6 is a graph showing the reflection loss according to the distance G between the second feed line and the coupling pattern in one embodiment of the present invention.

Referring to FIG. 6, as the gap G between the second feed line 114 and the coupling pattern 124 decreases from 1.5 mm to 0.5 mm, between the capacitively coupled feed pattern 110 and the parasitic patch 120. Larger capacitive coupling results in lower resonance frequencies, wideband characteristics, and better impedance matching in each frequency band.

FIG. 7 is a graph showing the return loss according to the distance D2 between the first feed line and the ground connection pattern in an embodiment of the present invention.

Referring to FIG. 7, it can be seen that the resonance frequency band and the impedance matching characteristic may be adjusted by changing the distance D2 between the first feed line 112 and the ground connection pattern 122.

If the distance D2 between the first feed line 112 and the ground connection pattern 122 is too narrow, it cannot be ignored between the first feed line 112 and the ground connection pattern 122. Coupling may occur. When the distance D2 between the first feed line 112 and the ground connection pattern 122 is too wide, coupling occurs between the termination pattern 126 and the second feed line 114. Since the distance D2 between the first feed line 112 and the ground connection pattern 122 may be appropriately adjusted.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be construed as limiting the scope of the present invention. I will understand.

Therefore, the scope of the present invention should not be limited to the above-described embodiments, but should be determined by equivalents to the appended claims, as well as the appended claims.

102: substrate 104: ground
106: first antenna 108: second antenna
110: capacitively coupled feed pattern 112: first feed line
114: second feed line 120: parasitic patch
122: ground connection pattern 124: coupling pattern
126: termination pattern 130: feed point

Claims (6)

  1. Board;
    Ground formed in a portion of the substrate; And
    A first antenna formed on a substrate on which the ground is not formed; And
    And a second antenna formed on the substrate on which the ground is not formed to be spaced apart from the first antenna.
    Each of the first antenna and the second antenna,
    A capacitively coupled feed pattern spaced apart from the ground and receiving current through a feed point; And
    And a parasitic patch connected to the ground to surround the capacitively coupled feed pattern and fed through coupling with the capacitively coupled feed pattern.
  2. The method of claim 1,
    The second antenna,
    A multi-band MIMO antenna is formed symmetrically with the first antenna.
  3. The method of claim 2,
    The capacitively coupled feed pattern has an L-shaped shape, and the parasitic patch has a C-shaped shape surrounding the capacitively coupled feed pattern.
  4. The method of claim 3,
    The capacitive coupling feed pattern is,
    A first power supply line formed to be spaced apart from the ground at a predetermined interval and formed perpendicular to the ground; And
    And a second feed line formed perpendicular to the first feed line at an end of the first feed line.
  5. The method of claim 4, wherein
    The parasitic patch,
    A ground connection pattern connected to the ground at the ground, the ground connection pattern being formed to be parallel to the first feed line at a predetermined interval;
    A coupling pattern formed at a distal end of the ground connection pattern to be perpendicular to the ground connection pattern, formed in parallel with the second feed line, and forming a coupling with the second feed line; And
    And a termination pattern formed vertically with the coupling pattern from the end of the coupling pattern to the lower portion of the coupling pattern.
  6. The method of claim 5,
    The multi-band MIMO antenna,
    A feed point formed in a space between the ground and the first feed line;
    Wherein the capacitively coupled feed pattern is supplied with current through the feed point and the parasitic patch is fed through coupling with the capacitively coupled feed pattern.


KR20100096977A 2010-10-05 2010-10-05 Multi band mimo antenna KR101166089B1 (en)

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CN104852129A (en) * 2014-02-19 2015-08-19 日本安特尼株式会社 Antenna device
CN105826657A (en) * 2016-05-19 2016-08-03 中国计量大学 Ferrite film multiple-input multiple-output mobile phone antenna

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WO2012115843A1 (en) 2011-02-21 2012-08-30 Corning Cable Systems Llc Providing digital data services as electrical signals and radio-frequency (rf) communications over optical fiber in distributed communications systems, and related components and methods
CN103682577B (en) * 2012-08-31 2016-09-07 鸿富锦精密工业(深圳)有限公司 Multifrequency antenna
KR101955981B1 (en) * 2012-09-16 2019-06-24 엘지전자 주식회사 Antenna module and mobile terminal having the same
KR101389392B1 (en) * 2013-02-13 2014-04-25 엘에스엠트론 주식회사 Internal mimo antenna capable of frequency tuning
CN103441326B (en) * 2013-06-17 2015-10-28 清华大学 For the Plane-type broadband double-antenna system of mobile terminal
CN103326116B (en) * 2013-06-17 2015-06-10 清华大学 Small-size plane wide-band double-antenna system used for mobile terminal
KR101416931B1 (en) * 2013-07-22 2014-07-08 순천향대학교 산학협력단 Operating Line MIMO Antenna
CN104752829A (en) * 2013-12-31 2015-07-01 启碁科技股份有限公司 Antenna system
WO2016071902A1 (en) 2014-11-03 2016-05-12 Corning Optical Communications Wireless Ltd. Multi-band monopole planar antennas configured to facilitate improved radio frequency (rf) isolation in multiple-input multiple-output (mimo) antenna arrangement
WO2016075696A1 (en) 2014-11-13 2016-05-19 Corning Optical Communications Wireless Ltd. Analog distributed antenna systems (dass) supporting distribution of digital communications signals interfaced from a digital signal source and analog radio frequency (rf) communications signals
WO2016098109A1 (en) 2014-12-18 2016-06-23 Corning Optical Communications Wireless Ltd. Digital interface modules (dims) for flexibly distributing digital and/or analog communications signals in wide-area analog distributed antenna systems (dass)
WO2016098111A1 (en) 2014-12-18 2016-06-23 Corning Optical Communications Wireless Ltd. Digital- analog interface modules (da!ms) for flexibly.distributing digital and/or analog communications signals in wide-area analog distributed antenna systems (dass)
KR101709077B1 (en) 2015-11-20 2017-02-22 현대자동차주식회사 Antenna apparatus, manufacture method of antenna apparatus, vehicle having the same
CN106935971A (en) * 2015-12-29 2017-07-07 华为技术有限公司 Antenna and communication equipment
CN108767442A (en) * 2018-05-30 2018-11-06 杭州电子科技大学 A kind of MIMO terminal antennas of the wide-band high isolation of no decoupling arrangements

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CN104852129B (en) * 2014-02-19 2018-10-12 日本安特尼株式会社 Antenna assembly
CN105826657A (en) * 2016-05-19 2016-08-03 中国计量大学 Ferrite film multiple-input multiple-output mobile phone antenna
CN105826657B (en) * 2016-05-19 2018-08-21 中国计量大学 A kind of ferrite film multiple-input and multiple-output antenna for mobile phone

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