KR101471840B1 - Broadband horizontally-polarized antenna and mimo antenna using the same - Google Patents

Abstract

The present invention relates to a broadband horizontally-polarized antenna, comprising: multiple first slots which are formed on a same substrate; and second slots which are formed on the same substrate as the first slots and are formed among the first slots, wherein the first slots are fed, and the second slots are not fed.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a broadband horizontal polarized wave antenna and a MIMO antenna using the same,

The present invention relates to a broadband horizontal polarized wave antenna, and more particularly to a broadband horizontal polarized wave antenna having a plurality of first slots formed at equal intervals on the same substrate, a second slot disposed between the first slots, The present invention relates to a horizontal polarization antenna capable of realizing excellent impedance matching and an omni- directional radiation pattern in a wide band using a feeding structure that feeds only a slot.

With the advancement of wireless communication technology, it is possible to realize high data rate anytime and anywhere. However, DAS (Distributed Antenna System) system is widely used in shaded areas such as buildings underground.

The most popular antenna in DAS is a small omni-antenna, which features omnidirectional orientation. In addition, as the multi-input multiple-output (MIMO) technique is developed into a next generation mobile communication (LTE, etc.), a multi-polarization omnidirectional antenna supporting MIMO is required in a DAS system.

In addition, since the DAS system often uses a plurality of mobile communication frequencies in common by a plurality of operators, the operating frequency band of the antenna is broadened. For example, when PCS, WCDMA and LTE frequency bands are simultaneously served, a broadband of 1000 MHz is required, which ranges from 1710 MHz to 2690 MHz.

On the other hand, in a multi-polarized antenna (particularly, a dual polarized antenna) to be used in a DAS system, a wide band can be easily implemented by using a monopole in the form of a cone in the case of vertically polarized waves, It is very difficult to implement an antenna.

1 shows a conventional horizontal polarization antenna.

FIG. 1 (A) is an antenna introduced in "IEEE 802.11 AP" in "A Notch-wire Composite Antenna for Polarization Diversity Reception". 1 is an omnidirectional omnidirectional antenna in which three slots are formed at 120-degree intervals on a ground, and signals having a phase difference of 120 degrees are fed to the respective slots.

Also, FIG. 1B is an antenna introduced in US 7064725, published in 2005. Specifically, FIG. 1B shows an antenna in which a slot is etched on one side of a PCB substrate and a microstrip line is formed on the other side to feed power to the slot.

These conventional horizontal polarized wave antennas have to operate in a very narrow band as mentioned above. Specifically, FIG. 1 A shows an operating bandwidth of only 17%, and FIG. 1B shows an operating frequency band of 2400 to 2500 MHz with a bandwidth of only 10% or less.

Therefore, it is required to develop a new horizontal polarization antenna capable of operating in a wide band.

The present invention has been invented based on such a technical background and has been invented to provide additional technical elements which can not easily be invented by a person having ordinary skill in the art, as well as satisfying the technical requirements of the present invention.

It is an object of the present invention to provide a new horizontal polarized wave antenna which can operate even in a wide band.

It is another object of the present invention to provide a novel horizontal polarized wave antenna which can exhibit the characteristics of an omni-directional antenna and can be applied to an MIMO antenna.

The technical problem to be solved by the present invention is not limited to the above-mentioned technical problems, and various technical problems can be included within the scope of what is well known to a person skilled in the art from the following description.

According to an aspect of the present invention, there is provided a horizontal polarization antenna including: a plurality of first slots formed on a same substrate; And a second slot formed on the same substrate as the plurality of first slots and formed between the first slots, wherein the plurality of first slots are fed and the second slot is fed .

In addition, the horizontal polarization antenna according to an embodiment of the present invention is characterized in that three or more first slots are formed on the same substrate at even intervals.

In addition, the horizontal polarization antenna according to an embodiment of the present invention is characterized in that the plurality of first slots are formed on the same substrate at equal angular intervals.

In addition, a horizontal polarized wave antenna according to an embodiment of the present invention is characterized in that N first slots are formed on the same substrate at equal angular intervals, and N second slots are formed .

In the horizontal polarization antenna according to an embodiment of the present invention, the N first slots are formed at intervals of 360 degrees / N, and the N second slots are formed at intervals of 360 degrees / N .

In addition, a horizontally polarized antenna according to an embodiment of the present invention is characterized in that a vertically polarized antenna element of a cone shape is formed below the substrate on which the plurality of first slots and the second slots are formed do.

According to another aspect of the present invention, there is provided a horizontal polarization antenna, wherein a ground portion is formed below the vertical polarization antenna element.

Further, the horizontal polarization antenna according to an embodiment of the present invention is characterized in that the plurality of first slots are formed in the same shape.

According to an aspect of the present invention, there is provided a wideband MIMO antenna including a plurality of first slots formed on the same substrate and a second slot formed between the plurality of first slots, A horizontal polarized wave antenna element feeding only the plurality of first slots and not feeding the second slot; And a vertical polarization antenna element disposed adjacent to the horizontal polarization antenna element and formed in a cone shape.

The wideband MIMO antenna according to an embodiment of the present invention is characterized in that the plurality of first slots are formed on the same substrate at equal angular intervals.

The present invention can realize a horizontally polarized antenna capable of operating in a wide band. More specifically, the present invention relates to a method of manufacturing a plasma display panel in which a plurality of first slots formed on the same substrate, a second slot disposed between the first slots, A horizontal polarization antenna capable of operating in a wide band can be implemented through a power feeding structure that does not supply power.

In addition, the present invention can realize a horizontally polarized omnidirectional antenna having improved non-directional characteristics while operating in a wide band. More specifically, the present invention can resonate with the feed slot even if the auxiliary slots are not directly fed using a structure in which auxiliary slots (second slots) are disposed between the feed slots (first slots) By using the effect of the slot expansion, the omnidirectional characteristic of the horizontal polarization antenna can be further improved.

The present invention also provides a method of tuning an operating bandwidth and a radiation pattern by adjusting the shape (length, thickness, etc.) of a feed slot (first slot) or adjusting the shape of an auxiliary slot (second slot) Can be fine-tuned. Therefore, the present invention can be tuned to a finer characteristic, since various objects to be controlled for controlling the characteristics of the antenna vary.

The effects of the present invention are not limited to the above-mentioned effects, and various effects can be included within the range that is obvious to a person skilled in the art from the following description.

1 is an exemplary view showing a conventional horizontal polarization antenna.
2 is a diagram illustrating an example of a horizontal polarization antenna according to an embodiment of the present invention.
3 is a photograph showing a prototype of a horizontal polarization antenna according to an embodiment of the present invention.
4 is an exemplary view illustrating a wideband MIMO antenna according to an embodiment of the present invention.
5 to 6 are graphs illustrating exemplary operational characteristics of a wideband MIMO antenna according to an embodiment of the present invention.

Hereinafter, a wideband horizontal polarized wave antenna and a multiple-input multiple-output (MIMO) antenna using the same according to the present invention will be described in detail with reference to the accompanying drawings. The embodiments are provided so that those skilled in the art can easily understand the technical spirit of the present invention, and thus the present invention is not limited thereto. In addition, the matters described in the attached drawings may be different from those actually implemented by the schematic drawings to easily describe the embodiments of the present invention.

In the meantime, each constituent unit described below is only an example for implementing the present invention. Thus, in other implementations of the present invention, other components may be used without departing from the spirit and scope of the present invention. In addition, each component may be implemented solely by hardware or software configuration, but may be implemented by a combination of various hardware and software configurations performing the same function. Also, two or more components may be implemented together by one hardware or software.

Also, the expression " comprising " is intended to merely denote that such elements are present as an expression of " open ", and should not be understood to exclude additional elements.

Also, the expressions such as 'first, second', etc. are used only to distinguish between plural configurations, and do not limit the order or other features among the configurations.

Hereinafter, a horizontal polarization antenna according to an embodiment of the present invention will be described with reference to FIGS. 2 to 4. FIG.

The horizontal polarized wave antenna according to an embodiment of the present invention can be used to implement a dual polarization omnidirectional MIMO antenna in a DAS (Distributed Antenna System) system, but is not limited thereto. That is, the horizontal polarized wave antenna according to an embodiment of the present invention to be described below can be applied to various fields where it is necessary to realize a wideband horizontal polarization unidirectional radiation pattern.

The horizontal polarization antenna according to an exemplary embodiment of the present invention may include at least two types of slot structures. Specifically, the horizontal polarization antenna includes a plurality of first slots formed at equal intervals on the same substrate, And a second slot formed on the same substrate as the first slot and formed between the first slots. Here, it is preferable that the plurality of first slots are fed and the second slots are not fed.

The plurality of first slots are slots in which feeding is performed directly. Specifically, the plurality of first slots are directly connected to a feed cable, a power feeding circuit, and the like to receive power.

In addition, it is preferable that the plurality of first slots are formed on the same substrate together. Specifically, the plurality of first slots are preferably formed on a conductive substrate such as a metal substrate.

Preferably, the plurality of first slots are formed in a number of three or more, and the first slots are formed at equal intervals on the same substrate. In this case, it is preferable that the plurality of first slots are formed at uniform angular intervals about specific points existing on the substrate. For example, when N first slots are formed on a substrate, the N first slots are preferably formed at intervals of 360 degrees / N around a specific point existing on the substrate.

The plurality of first slots may be formed in various shapes, but are preferably formed in a shape having a quarter wavelength length at an operation center frequency.

The plurality of first slots may be formed in different shapes, but they may be formed in the same shape. This structure allows the omnidirectionality of the radiation pattern to be further improved.

And the plurality of second slots are formed additionally on a substrate on which the plurality of first slots are formed. (In fact, although the horizontal radiation pattern itself can be implemented by only the plurality of first slots, as described above, there is a problem that the bandwidth is very narrow in the conventional technologies of implementing a horizontal polarization antenna with only a plurality of first slots . Thus, the present invention improves the problem of bandwidth by further forming the 'plurality of second slots'.)

The plurality of second slots may be formed on the first space of the first slots. Specifically, the plurality of second slots are preferably formed such that each second slot is disposed between the two first slots.

In addition, unlike the first slots, the plurality of second slots are preferably formed so as not to be directly fed. Specifically, it is preferable that the plurality of second slots are formed so as not to be directly connected to a feed cable, a power feeding circuit, or the like.

The plurality of second slots may be formed at even intervals on the substrate. Preferably, the plurality of second slots may be formed at equal angular intervals around specific points existing on the substrate, have. For example, when N second slots are formed on the substrate, the N second slots may be formed in the fourth slots of the first slots such that each of the N second slots has a certain point Is formed at an angle of 360 degrees / N with respect to the center.

Also, the plurality of second slots may be formed in various shapes, but may be formed in a shape having a quarter wavelength length at an operation center frequency.

The plurality of second slots may be formed in different shapes, but they may be formed in the same shape. This structure allows the omnidirectionality of the radiation pattern to be further improved.

The horizontal polarization antenna of the present invention can realize a wideband horizontal polarization radiation pattern based on the plurality of first slots and the plurality of second slots. Specifically, by adding an auxiliary slot (a plurality of second slots) to a basic slot structure (a plurality of first slots), not only the resonance by the supplied basic slot (first slot) Resonance occurs with a half-wave length between the slot (first slot) and the feed slot (first slot). Accordingly, a surface that is operated only on the ground causes an effect like a thick dipole, .

In addition, the above-mentioned horizontal polarization antenna can further improve the non-directional characteristic of the radiation pattern. Specifically, the horizontal polarization antenna can generate resonance by N second slots at the same time even if power is supplied to only N first slots, so that the effect of expanding the number of slots to 2N can be realized, The non-directional characteristic of the pattern can be further improved. In addition, the horizontal polarization antenna may be arranged such that the plurality of first slots are arranged at equal angular intervals around a specific point, and the plurality of second slots (arranged in a space of the first slots) The irregularity characteristic can be further improved by this structural feature.

In addition, since the control parameters of the horizontally polarized antenna are further diversified (the length of the second slot, the arrangement interval of the second slot, the thickness of the second slot, etc.), the operation bandwidth or radiation pattern It may be tuned more finely.

Meanwhile, the horizontal polarization antenna can be combined with a vertical polarization antenna to realize a multiple-input multiple-output (MIMO) antenna. In particular, a wide-band MIMO antenna can be realized by combining with a vertical polarization antenna. For example, the horizontal polarization antenna may be combined with a cone-shaped broadband vertical polarized wave antenna element disposed under the substrate on which the first slots and the plurality of second slots are formed, Can be implemented. In this case, it is preferable that a ground portion is formed below the cone-shaped vertical polarized antenna element.

Referring to FIG. 2, there are several exemplary slot structures that the present invention may include.

2 shows an example in which three first slots 111, 112 and 113 and three second slots 211, 212 and 213 are formed on the same metal substrate. In this example, the three first slots 111, 112 and 113 are arranged at 120-degree intervals around specific points (in this case, the center of the substrate) existing on the substrate, and the three second slots 211 , 212 and 213 are also arranged at intervals of 120 degrees around the specific point. In addition, each of the second slots is disposed on the first space of the first slots, specifically, the space formed by the three short spaces 111-112, 112-113, and 113-111 formed by neighboring first slots. The three second slots 211, 212, and 213 are respectively disposed on the first and second slots.

In this case, the feed cables are connected to only the first slots 111, 112, and 113, and the feed cables are not connected to the second slots 211, 212, and 213.

2 shows an example in which four first slots 121, 122, 123 and 124 and four second slots 221, 222, 223 and 224 are formed on the same metal substrate. In this example, the four first slots 121, 122, 123 and 124 are arranged at 90-degree intervals around specific points (in this case, the center of the substrate) existing on the substrate, The slots 221, 222, 223, and 224 are also arranged at intervals of 90 degrees around the specific point. In addition, each of the second slots is disposed in the first space of the first slots. Specifically, four fourth spaces 121-122, 122-123, 123-124, and 124-121 formed by neighboring first slots The four second slots 221, 222, 223, and 224 are respectively disposed on the four slots.

In this case, the feed cables are connected only to the first four slots 121, 122, 123 and 124, and the feed cables are not connected to the four second slots 221, 222, 223 and 224 .

Referring to FIG. 3, an exemplary power supply structure that the present invention may include.

3 shows an exemplary feeding of a horizontally polarized antenna including four first slots 121, 122, 123 and 124 and four second slots 221, 222, 223 and 224 formed on the same metal substrate Structure.

In this case, the metal substrate on which the slots are formed is coupled to one surface of a dielectric substrate (PCB or the like), and a power feed pattern formed on the other surface of the dielectric substrate and a via hole penetrating the dielectric substrate, do.

3, the first slot 121, the second slot 123, and the fourth slot 124 are provided with a power feeding structure. In this case, . Specifically, only the four first slots 121, 122, 123 and 124 are fed through the feeding patterns 321, 322, 323 and 324 formed on the other surface of the dielectric substrate 121-321, 122-322 and 123-323 , 124-324), and a feed structure is formed in such a manner that no feeding is performed in the four second slots 221, 222, 223, and 224.

Hereinafter, a wideband MIMO antenna according to an embodiment of the present invention will be described with reference to FIGS.

4, a wideband MIMO antenna according to an embodiment of the present invention includes a plurality of first slots formed on the same substrate and a second slot formed between the plurality of first slots, A vertical polarized wave antenna element 20 disposed adjacent to the horizontal polarized wave element and formed in a cone shape, And a ground 30 for grounding the devices.

The wide-band MIMO antenna according to an embodiment of the present invention can be realized by 1) implementing horizontally polarized wave of a wide band through the horizontal polarization antenna element 10 including the first slot and the second slot, 2) The vertical polarization of the wideband can be realized through the vertically polarized antenna element 20 of the Cone shape, so that the MIMO can be realized in the wide band.

Here, the horizontal polarization antenna element 10 is a horizontal polarization antenna according to an embodiment of the present invention. Accordingly, the above-mentioned contents can be applied to the horizontal polarization antenna element 10 as it is.

The vertical polarization antenna element 20 is an antenna element for realizing vertical polarization, and is preferably formed in a cone shape for a wide band. The vertical polarization antenna 20 may be formed below the horizontal polarization antenna element 10 as shown in FIG.

The grounding unit 30 may be formed in the form of a ground plane, preferably as a ground plane for grounding the antenna elements. In addition, the grounding portion 30 may be formed below the vertically polarized antenna element 20.

5 to 6, exemplary experimental data showing the operating characteristics of the wideband MIMO antenna can be examined.

In the experiment, a wide-band MIMO antenna having an operating frequency of 1700 to 2700 MHz was implemented by adjusting the sizes of the horizontal polarization antenna element 10 and the vertical polarization antenna element 20 constituting the wideband MIMO antenna, The operating characteristics of the antenna were examined.

5 is a graph showing a VSWR (Voltage Standing Wave Ratio) characteristic of the wideband MIMO antenna. As can be seen from the graphs, the wideband MIMO antenna exhibited good characteristics below the VSWR of 1.6: 1 in the entire operating frequency band (the entire wide band).

5 is a graph showing isolation characteristics of the wide-band MIMO antenna according to polarization. As can be seen from the graph, the wideband MIMO antenna exhibited a good isolation characteristic of 30 dB or more over the entire operating frequency band (the entire wide band).

The graph of Fig. 7 shows a radiation pattern for each polarized wave implemented by the wideband MIMO antenna. As can be seen from the graphs, the wideband MIMO antenna showed omnidirectional characteristics in both the horizontal polarization pattern and the vertical polarization pattern. In particular, the wideband MIMO antenna exhibits a very high level of non-directional characteristics in the horizontal polarization pattern, which is attributable to the structural characteristics of the horizontal polarization antenna element described above.

As a result, it can be seen from the experimental data that the broadband MIMO antenna according to an embodiment of the present invention can realize a broadband operation characteristic and can realize a very high level of non-directional characteristic for each polarization.

The embodiments of the present invention described above are disclosed for the purpose of illustration, and the present invention is not limited thereto. It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention.

111, 112, 113, 121, 122, 123, 124:
211, 212, 213, 221, 222, 223, 224:
321, 322, 323, 324: feeding pattern
10: horizontal polarization antenna element
20: vertical polarization antenna element
30:

Claims (10)

A plurality of first slots formed on the same substrate; And
A second slot formed on the same substrate as the plurality of first slots and formed between the first slots;
≪ / RTI >
Wherein the plurality of first slots are fed and the second slot is not fed.
The method according to claim 1,
Wherein at least three first slots are formed at equal intervals on the same substrate.
The method according to claim 1,
Wherein the plurality of first slots are formed on the same substrate at equal angular intervals.
The method of claim 3,
N first slots are formed at equal angular intervals on the same substrate,
And N second slots are respectively formed between the first slots in which the N second slots are arranged close to each other.
5. The method of claim 4,
The N first slots are formed at intervals of 360 degrees / N,
And the N second slots are also formed at intervals of 360 degrees / N.
The method according to claim 1,
And a vertically polarized antenna element of a cone shape is formed on a lower portion of the substrate on which the plurality of first slots and the second slot are formed.
The method according to claim 6,
And a ground portion is formed under the vertical polarization antenna element.
The method according to claim 1,
Wherein the plurality of first slots are formed in the same shape.
A plurality of first slots formed on the same substrate and a second slot formed between the plurality of first slots, wherein only the plurality of first slots are fed and the second slots are not fed, ; And
A vertical polarization antenna element disposed adjacent to the horizontal polarization antenna element and formed in a cone shape;
Wherein the antenna comprises a first antenna and a second antenna.
10. The method of claim 9,
Wherein the plurality of first slots are formed at equal angular intervals on the same substrate.

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