WO2015190675A1

WO2015190675A1 - Omnidirectional mimo antenna using electro-polarization

Info

Publication number: WO2015190675A1
Application number: PCT/KR2015/002877
Authority: WO
Inventors: Jeong-Suk Park
Original assignee: Sawwave Co.,Ltd
Priority date: 2014-06-13
Filing date: 2015-03-24
Publication date: 2015-12-17
Also published as: JP2016537867A; KR101547474B1; JP6118950B2

Abstract

An omnidirectional MIMO antenna using electro-polarization, in detail, an antenna for wireless communications capable of omnidirectionally transmitting and receiving radio waves using electro-polarization, is provided. The omnidirectional MIMO antenna includes a first substrate formed to polarize a signal in an x-axis direction on one side thereof and polarize a signal in a y axis direction on the other side thereof, and including through holes penetrating a circuit board, a second substrate including x-axis and y-axis microstrip lines rotated by a predetermined angle based on a y axis, radiation antennas having a metallic plate shape and combined with one sides of the first and second substrates, and a connection circuit board connecting the first and second substrates. The first and second substrates and the connection circuit board are combined to have a cubic structure.

Description

OMNIDIRECTIONAL MIMO ANTENNA USING ELECTRO-POLARIZATION

The present disclosure relates to an omnidirectional multiple input multiple output (MIMO) antenna using electro-polarization, and more particularly, to a multiple transmission/receiving antenna for wireless communications by implementing an omnidirectional MIMO antenna using electro-polarization.

In general, in communications circuits, a plurality of high frequency signals are combined as one signal or bound as one to thereby establish communications means such as multiband systems via connection with other others.

When the plurality of signals are connected and used on one line, problems in which the signals are offset from one another, and loss thereof is caused due to division thereof, and the like, may occur.

Thus, peculiar antennas for each signal have been used or filters for filtering noise or the like have been installed, such that there have been negative attributes such as a complex structure, an increase in a size of a circuit, and the like.

Thus, the present applicant has proposed a method for controlling a current to only flow in a desired direction by controlling a high frequency signal current to flow in a predetermined direction on a metal plate using electro-polarization, and an antenna using the same, in Korean Patent No. 10-1017690 (Electro-polarization and Application thereof, hereinafter, referred to as ‘the related art’). Here, in the related art, when a high frequency signal is divided into a positive (+) signal and a negative (-) signal according to a polarity and two signals are applied to a metal plate, two signals are applied thereto to be connected to each other while maintaining a predetermined time interval therebetween. Thus, an effect that an application direction of the current is constant so as to allow the current to constantly flow only in a current application direction along an axis at which the current is applied may be obtained. Here, a combiner combining a plurality of signals with each other so as to provide the plurality of signals as one signal, using the effect as described above, or the like, is used, so that respective input signals may not be transferred to different input ports, but may only be transferred to an output port, thereby providing a technology in which the combiner is used as a combination circuit having excellent isolation between input ports and loss due to a signal combination is prevented.

Although the antenna technology of application thereof, according to the related art described above, in which the structure thereof is simplified and the effect thereof is excellent, has been provided, the development of an omnidirectional multiple-input multiple-output (MIMO) antenna in which a relatively large amount of transmission and more effective transmission and reception in various directions may be obtained has also been required. Further, a technology for implementation thereof with a simplified structure has been required.

An aspect of the present disclosure may provide an omnidirectional MIMO antenna using electro-polarization, having a simplified structure and high performance.

According to an aspect of the present disclosure, an omnidirectional multiple input multiple output (MIMO) antenna using electro-polarization, based on an antenna using electro-polarization by configuring an input port, a T distributor distributing a signal, and a 180 degree signal phase shifter via a metal stripline on a dielectric substrate and using a metal plate serving as a radiator of a patch antenna, the omnidirectional MIMO antenna may include a first substrate 100 including an x-axis microstrip line 110 formed on one side of the first substrate to polarize a signal in an x-axis direction, a y-axis microstrip line 120 formed on the other side thereof to polarize a signal in a y axis direction, through

holes

130a and 130b disposed to correspond to positions of

nodes

110a and 110b of the x axis microstrip line 110 while penetrating through a circuit board on a substrate on which the y axis microstrip line 120 is formed, and through

holes

140a and 140b disposed to correspond to positions of

nodes

120a and 120b of the y axis microstrip line 120 while penetrating through a circuit board on a substrate on which the x axis microstrip line 110 is formed, a second substrate 200 having the same structure as a structure of the first substrate 100 and including an x-axis microstrip line 210 and a y-axis microstrip line 220 formed thereon in a form provided by rotating an x-axis microstrip line and a y-axis microstrip line provided on substrate surfaces, 45°±5°, based on a y axis, radiation antennas 300 having a metallic plate shape and combined with one sides of the first substrate 100 and the second substrate 200, respectively, to form a circuit network and radiate a signal, and a connection circuit board 400 connecting the first substrate 100 and the second substrate 200 to each other, wherein the first substrate 100, the second substrate 200, and the connection circuit board 400 are combined to have a cubic structure.

In implementing the omnidirectional MIMO antenna using the electro-polarization, the first substrate 100 having the x axis microstrip line 110 disposed on a front surface thereof, a reverse-first substrate 100’ having a form obtained by inverting the first substrate 100 so as to have the y axis microstrip line 120 disposed on a front surface thereof, the second substrate 200 having the x axis microstrip line 210 disposed on a front surface thereof, and a reverse-second substrate 200’ having a form obtained by inverting the second substrate 200 so as to have the y axis microstrip line 220 disposed on a front surface thereof, may be disposed to form sides thereof in a manner of connecting sides of the respective substrates to one another so as to have an enclosure structure. The connection circuit board 400 is combined with an open portion of a lower end portion of the enclosure structure, and then, the radiation antennas 300 are combined with the front surfaces of the respective substrates, respectively so as to provide the omnidirectional MIMO antenna. The connection circuit board 400 includes a first terminal 410 and a second terminal 420 disposed in a lower surface thereof to receive a signal, the first terminal 410 being penetrated through the circuit board to be connected to a stripline formed on one side, and the second terminal 420 being connected to a stripline formed on the other side.

The first terminal 410 and the second terminal 420 may respectively receive different signals to prevent the signals from contacting each other when a plurality of frequencies are radiated by polarizing the signals, such that the plurality of frequencies are transmitted and received.

A cube-shaped omnidirectional antenna formed by the first substrate 100, the second substrate 200, the connection circuit board 400, and the radiation antenna 300 may include a plurality of striplines formed on the first substrate 100 and the second substrate 200 thereof, respectively, and a plurality of radiation antennas to correspond to the plurality of striplines, so as to form a cube, thereby obtaining an antenna structure for multiband communications.

An omnidirectional MIMO antenna using electro-polarization according to an exemplary embodiment of the present disclosure is provided in which a structure thereof may be simplified, the expansion thereof may be carried out in various manners, and high performance may be obtained.

FIG. 1 is a schematic view illustrating electro-polarization according to an exemplary embodiment of the present disclosure.

FIG. 2 illustrates a front view and a rear view illustrating a configuration of a microstrip line of a first substrate 100 according to an exemplary embodiment of the present disclosure.

FIG. 3 illustrates a front view and a rear view illustrating a configuration of a microstrip line of a second substrate 200 according to an exemplary embodiment of the present disclosure.

FIG. 4 is a cross-sectional view illustrating a configuration of a polarization antenna according to an exemplary embodiment of the present disclosure.

FIG. 5 is a perspective view of an omnidirectional MIMO antenna using electro-polarization according to an exemplary embodiment of the present disclosure.

FIG. 6 is a bottom perspective view of an omnidirectional MIMO antenna using electro-polarization according to an exemplary embodiment of the present disclosure.

FIG. 7 is a development illustrating an outer peripheral surface of an omnidirectional MIMO antenna using electro-polarization according to an exemplary embodiment of the present disclosure.

FIGS. 8 and 9 are diagrams illustrating radiation patterns of an omnidirectional MIMO antenna using electro-polarization according to an exemplary embodiment of the present disclosure.

FIGS. 10 and 11 are diagrams illustrating omnidirectional MIMO antennas according to exemplary embodiments of present disclosure by way of examples.

Hereinafter, an omnidirectional MIMO antenna according to exemplary embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. The disclosure may, however, be exemplified in many different forms and should not be construed as being limited to the specific embodiments set forth herein.

Briefly describing electro-polarization with reference to FIG. 1, when a signal is applied to a microstrip implemented on a circuit board, a ‘+’ signal and a ‘-‘ signal of the applied signal may be separated from each other according to a phase difference, and power feed to an antenna may be performed in response to the separated signals, thereby generating electro-polarization.

Such electro-polarization may be obtained by configuring an input port, a T distributor distributing a signal, and a 180 degree signal phase shifter via a metal stripline on a dielectric circuit board, and using a metal plate serving as a radiator of a patch antenna so as to generate electro-polarization.

In order to generate the electro-polarization, a pair of polarized strips may be respectively disposed in an x axis and a y axis on a single substrate to exhibit an antenna effect.

Since the technology as described above is a technology commonly known in the art as disclosed in Korean Patent No. 10-1017690 (Electro-Polarization and Application Thereof), a detailed description thereof will be omitted.

Hereinafter, an omnidirectional MIMO antenna using electro-polarization will be described in detail.

FIG. 2 illustrates a front view and a rear view illustrating a configuration of a microstrip line of a first substrate 100 according to an exemplary embodiment of the present disclosure. FIG. 3 illustrates a front view and a rear view illustrating a configuration of a microstrip line of a second substrate 200 according to an exemplary embodiment of the present disclosure.

A detailed description thereof will be hereinafter provided with reference to FIGS. 2 and 3. In the case of the first substrate 100, an x axis microstrip line 110 for generating polarization deflected in an x axis direction may be formed on one side of a circuit board, and a y axis microstrip line 120 for generating polarization deflected in a y axis direction may be formed on the other side of the circuit board on which the x axis microstrip line 110 has been formed. In other words, in the first substrate 100, the x axis microstrip line 110 and the y axis microstrip line 120 may be formed on a front surface portion and a rear surface portion of the circuit board, respectively.

In addition, through

holes

130a and 130b corresponding to positions of

nodes

110a and 110b of the x axis microstrip line 110 may be formed in a circuit board surface on which the y axis microstrip line 120 has been formed, and through

holes

140a and 140b corresponding to positions of

nodes

120a and 120b of the y axis microstrip line 120 may be formed in the circuit board surface on which the x axis microstrip line 110 has been formed, so as to penetrate through the circuit board, respectively, such that four lead pins 310 disposed on one side of a radiation antenna 300 having a metallic plate shape may be connected thereto, respectively.

Respectively forming the x axis microstrip line 110 and the y axis microstrip line 120 to be discriminated from each other on both sides of the circuit board as described above is to provide three-dimensional implementation so as to solve problems such as short circuits or the like occurring when microstrip lines are formed on a single board and the size of a circuit board is increased at the time of forming a fine pattern.

Here, the fact that a technology of implementation on a single surface of a circuit board and a technology of implementation on respective substrate surfaces have the same technical effect is commonly known in the art, and thus, an additional description thereof will be omitted.

In addition, the second substrate 200 configuring a MIMO antenna using electro-polarization of the present disclosure, together with the first substrate 100 may include an x axis microstrip line 210 and a y axis microstrip line 220 formed thereon and rotated 45°±5° based on a y axis of the first substrate 100.

In further detail, the x axis microstrip line 110 of the first substrate 100 and the x axis microstrip line 210 of the second substrate 200, and the y axis microstrip line 120 of the first substrate 100 and the y axis microstrip line 220 of the second substrate 200 may have a difference of 45°±5° in an angle thereof, respectively.

Through

holes

230a and 230b and through

holes

240a and 240b for combination of lead pins 310 therewith may also be formed in the other side of the circuit board to correspond to positions of

nodes

210a and 210b of the x axis microstrip line 210 and

nodes

220a and 220b of the y axis microstrip line 220 of the second substrate 200.

A radiation antenna 300 having a metallic plate shape to radiate a signal may be provided on one sides of the first substrate 100 and the second substrate 200 configured as described above,

As described above, the radiation antenna 300 may have four lead pins 310 disposed on one side thereof to be connected with the through holes formed in the respective circuit boards to thereby configure a circuit.

As described above, the radiation antennas 300 may be combined with the first substrate 100 and the second substrate 200, respectively, to thus complete a polarization antenna.

Here, the radiation antennas 300 connected to the first substrate 100 and the second substrate 200 may be spaced apart from each other so as to have an air gap 150 formed therebetween in the connection state thereof.

The formation of the air gap 150 is to match a resonance frequency of polarization generated by the radiation antennas 300, or the like.

FIG. 5 is a perspective view of an omnidirectional MIMO antenna using electro-polarization according to an exemplary embodiment of the present disclosure. FIG. 6 is a bottom perspective view of an omnidirectional MIMO antenna using electro-polarization according to an exemplary embodiment of the present disclosure. FIG. 7 is a development of an outer peripheral surface of an omnidirectional MIMO antenna using electro-polarization according to an exemplary embodiment of the present disclosure, and illustrates polarization generated through respective ports.

In a detailed description with reference to FIGS. 5 to 7, an omnidirectional MIMO antenna having a cube shape may be implemented by disposing polarization antennas manufactured by coupling the radiation antennas 300 to the first substrate 100 and the second substrate 200, respectively, to become respective surfaces of a cube.

Here, a plurality of the first substrates 100 and the second substrates 200 may be disposed to be sides thereof, and subsequently, a connection circuit board 400 for connection may be disposed to be a lower surface thereof to thereby form a circuit network.

Here, another first substrate 100 may be disposed at a side thereof adjacent to the first substrate 100. In this case, a reverse-first substrate 100’ having a form in which the first substrate 100 is inverted to allow the y axis microstrip line 120 of the first substrate 100 to be disposed on a front surface thereof may be disposed to implement a circuit network.

It is noted that the reverse-first substrate 100’ has a form provided by simply inverting the first substrate 100 so as to be discriminated from a normal first substrate 100, but is not to indicate a different constituent element. Further, it is noted that the reverse-first substrate 100’ is only disposed to configure a cubic circuit and circuit network, but is not to provide a different effect and a functional difference.

In addition, the second substrates 200 may be disposed at sides remaining after the first substrates 100 are disposed as described above.

Further, here, the second substrate 200 and a reverse-second substrate 200’ having a form obtained by simply inverting the second substrate 200 may be disposed to form sides of a cube.

After the first substrate 100 and the second substrate 200 are respectively disposed to implement the sides of the cube as described above, the connection circuit board 400 may be disposed to be a lower surface of the cube to thus form the circuit network.

Here, a first terminal 410 and a second terminal 420 serving as input and output terminals may be respectively provided on one side of the connection circuit board 400.

The first terminal 410 and the second terminal 420 described above may be connected to ends of striplines formed to implement circuits on both sides, respectively.

In further detail, the first terminal 410 may penetrate through the circuit board to be connected to an end of the stripline provided at an upper end portion of the connection circuit board 400, and the second terminal 420 may be connected to an end of the stripline at a side opposite thereto in the connection circuit board 400.

As a signal is applied to the omnidirectional MIMO antenna using electro-polarization, configured as described above according to an exemplary embodiment of the present disclosure, a signal may be radiated by the polarization antennas disposed on respective sides (see FIGS. 8 and 9).

FIG. 8 illustrates a radiation pattern provided when a signal is applied to the first terminal 410, and FIG. 9 illustrates a radiation pattern provided when a signal is applied to the second terminal 420.

Here, when the signal is applied to the first terminal 410 and the second terminal 420, signals radiated via the respective polarization antennas may be radiated to be in a uniform range, based on the antenna, so as to serve as an omnidirectional antenna.

Signals radiated using the omnidirectional antenna may be radiated as a plurality of frequency signals as well as a single frequency signal, and this technology employs electro-polarization disclosed in Korean Patent No. 10-1017690. Thus, a detailed description thereof will be omitted.

A frequency to be transmitted and received using an omnidirectional MIMO antenna using electro-polarization according to an exemplary embodiment of the present disclosure may be selected by adjusting a size of the radiation antenna 300 having a metallic plate shape, which may be changed depending on a length of the radiation antenna 300 having a metallic plate shape, as a technology commonly known in the art.

FIGS. 10 and 11 are diagrams illustrating omnidirectional MIMO antennas according to exemplary embodiments of the present disclosure by way of examples.

In a detailed description with reference to FIGS. 10 and 11, an omnidirectional MIMO antenna using electro-polarization according to an exemplary embodiment of the present disclosure may be applied to have a single structure. In addition, a multiband omnidirectional MIMO antenna may also be implemented by forming a plurality of striplines on a single substrate according to an amount of frequency and providing a plurality of radiation antennas thereon.

Here, the numbers of striplines implemented on a single substrate and combined radiation antennas may be 2n, respectively.

Via the method as described above, a two-stage multiband omnidirectional MIMO antenna formed by forming two striplines on a single substrate and connecting radiation antennas to each other, or a four-stage multiband omnidirectional MIMO antenna may be implemented.

In more detail, a structure may be formed by disposing a plurality of substrates provided with striplines and radiation antennas formed thereon on sides and then connecting a connection circuit board to an open portion of a lower end portion thereof.

As a method of implementing the structure as described above, the same method as the foregoing method of implementing the single structure as described above may be applied thereto. In the case of two-stage or four-stage multiband antennas, there may only be a difference in terms of the amounts of striplines and radiation antennas formed on a single circuit board.

With the method described above, a MIMO antenna and a multiband MIMO antenna using electro-polarization according to an exemplary embodiment of the present disclosure may be implemented.

Here, the multiband MIMO antenna is only provided for discrimination thereof from a single structure, and thus, exemplary embodiments of the present disclosure may be modified and varied without departing from the scope of the present invention.

While exemplary embodiments have been shown and described above, it will be apparent to those skilled in the art that modifications and variations could be made without departing from the scope of the present invention as defined by the appended claims.

[Description of Reference Numerals]

100 : First Substrate

110 : X-axis Microstrip Line

120 : Y-axis Microstrip Line

200 : Second Substrate

210 : X-axis Microstrip Line

220 : Y-axis Microstrip Line

300 : Radiation Antenna

400 : Connection Circuit Board

Claims

An omnidirectional multiple input multiple output (MIMO) antenna using electro-polarization, based on an antenna using electro-polarization by configuring an input port, a T distributor distributing a signal, and a 180 degree signal phase shifter on a dielectric substrate via a metal stripline and using a metal plate serving as a radiator of a patch antenna, the omnidirectional MIMO antenna comprising:

a first substrate 100 including an x-axis microstrip line 110 formed on one side of the first substrate to polarize a signal in an x-axis direction, a y-axis microstrip line 120 formed on the other side thereof to polarize a signal in a y axis direction, through holes 130a and 130b disposed to correspond to positions of nodes 110a and 110b of the x axis microstrip line 110 while penetrating through a circuit board on a substrate on which the y axis microstrip line 120 is formed, and through holes 140a and 140b disposed to correspond to positions of nodes 120a and 120b of the y axis microstrip line 120 while penetrating through a circuit board on a substrate on which the x axis microstrip line 110 is formed;

a second substrate 200 having the same structure as a structure of the first substrate 100 and including an x-axis microstrip line 210 and a y-axis microstrip line 220 formed thereon in a form provided by rotating an x-axis microstrip line and a y-axis microstrip line provided on substrate surfaces, 45°±5°, based on a y axis;

radiation antennas 300 having a metallic plate shape and combined with one sides of the first substrate 100 and the second substrate 200, respectively, to form a circuit network and radiate a signal; and

a connection circuit board 400 connecting the first substrate 100 and the second substrate 200 to each other,

wherein the first substrate 100, the second substrate 200, and the connection circuit board 400 are combined to have a cubic structure.
The omnidirectional MIMO antenna of claim 1, wherein the first substrate 100 having the x axis microstrip line 110 disposed on a front surface thereof, a reverse-first substrate 100’ having a form obtained by inverting the first substrate 100 so as to have the y axis microstrip line 120 disposed on a front surface thereof, the second substrate 200 having the x axis microstrip line 210 disposed on a front surface thereof, and a reverse-second substrate 200’ having a form obtained by inverting the second substrate 200 so as to have the y axis microstrip line 220 disposed on a front surface thereof, are disposed to form sides thereof in a manner of connecting sides of the respective substrates to one another so as to have an enclosure structure, the connection circuit board 400 is combined with an open portion of a lower end portion of the enclosure structure, and the radiation antennas 300 are combined with the front surfaces of the respective substrates, respectively, thereby providing the omnidirectional MIMO antenna using the electro-polarization.
The omnidirectional MIMO antenna of claim 1, wherein the connection circuit board 400 includes a first terminal 410 and a second terminal 420 disposed in a lower surface thereof to receive a signal, the first terminal 410 penetrating through the circuit board to be connected to a stripline formed on one side, and the second terminal 420 being connected to a stripline formed on the other side.
The omnidirectional MIMO antenna of claim 3, wherein the first terminal 410 and the second terminal 420 respectively receive different signals to prevent the signals from contacting each other when a plurality of frequencies are radiated by polarizing the signals.
The omnidirectional MIMO antenna of any one of claims 1 to 4, wherein a cube-shaped omnidirectional antenna formed by the first substrate 100, the second substrate 200, the connection circuit board 400, and the radiation antenna 300 comprises a plurality of striplines formed on the first substrate 100 and the second substrate 200 thereof, respectively, and a plurality of radiation antennas to correspond to the plurality of striplines, so as to form a cube, thereby obtaining an antenna structure for multiband communications.