KR101170722B1 - Apparatus and method for extending array radius structure using phase difference pair changing - Google Patents

Apparatus and method for extending array radius structure using phase difference pair changing Download PDF

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KR101170722B1
KR101170722B1 KR1020100129262A KR20100129262A KR101170722B1 KR 101170722 B1 KR101170722 B1 KR 101170722B1 KR 1020100129262 A KR1020100129262 A KR 1020100129262A KR 20100129262 A KR20100129262 A KR 20100129262A KR 101170722 B1 KR101170722 B1 KR 101170722B1
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dipole
phase difference
frequency signal
dipoles
center pole
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KR20120067711A (en
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김원석
정근석
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엘아이지넥스원 주식회사
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BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to propagation direction detection systems, and more particularly, to an array radius extension device and structure using a phase difference pair change that extends the radius of a phased array antenna of a propagation direction detection system. To this end, the present invention provides a propagation direction detection apparatus, comprising: a circular array antenna consisting of a plurality of dipoles in which an array radius with a center pole can be expanded, and converting a radio frequency signal received from the circular array antenna into an intermediate frequency signal. A frequency converter and a direction detecting processor configured to extend an array radius between the center pole and each dipole when the converted intermediate frequency signal is distorted, and to detect a propagation direction through a phase difference between each dipole and an adjacent dipole. Include.

Description

Apparatus and method for array radius expansion using phase difference pair change {APPARATUS AND METHOD FOR EXTENDING ARRAY RADIUS STRUCTURE USING PHASE DIFFERENCE PAIR CHANGING}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to propagation direction detection systems, and more particularly, to an array radius extension apparatus and method using a phase difference pair change that extends the radius of a phased array antenna of a propagation direction detection system.

In general, the phase comparison direction detecting antenna uses a dipole antenna having an omnidirectional radiation pattern. The length of the dipole is determined by the desired frequency range and should not be longer than the wavelength of the highest frequency. The dipole antennas are arranged in order to detect the direction of propagation. The arrangement method can be divided into linear array and circular array. The linear array antenna has a simple geometric structure and has the advantage of applying an algorithm that can obtain the propagation angle with a small amount of computation, but has a disadvantage that only one-dimensional angle of arrival can be estimated because it is arranged in one-dimensional space. . In contrast, the circular array antenna has an advantage in that the azimuth and elevation angles of the incident signal can be simultaneously estimated because the elements are arranged in a two-dimensional plane. In order to have a constant resolution irrespective of the direction of signal arrival, the size of the effective aperture of the array antenna should not change in accordance with the direction of signal arrival. To this end, the antenna elements should be uniformly arranged in a circular shape.

In the system using the array antenna, the direction detection system using the UHF band (100-500 MHz) may be implemented by circularly arranging five dipoles with a radius of 0.5 m. Such an antenna is called a circular array antenna.

1 is an exemplary view showing a general circular array antenna.

As shown, a typical circular array antenna has a center pole 110 located in the center and is composed of five dipoles 111, 112, 113, 114, and 115 around the center pole. The center pole refers to an inter-element interference phenomenon and a mechanism that serves as a support in the center. Each dipole is circularly arranged at equal intervals, and the angle between each dipole is 72 0 . Therefore, the distance D 1 between the second dipole 112 and the fifth dipole 115 may be represented by 2 Rsin (72 0 ).

For example, when the array radius, ie, R = 0.5m, the length of D 1 is about 0.951m. In this circular arrangement, the phase difference applied to the direction detection uses a pair difference represented by a solid line.

Table 1 below shows phase difference pairs used in a circular array antenna composed of five dipoles.

Phase difference pair 5-2 1-3 2-4 3-5 4-1

As shown in Table 1, a phase difference pair between each dipole is paired with the first dipole 111 and the fourth dipole 114 and the third dipole 113, and the second dipole 112 is the fourth dipole. Paired with 114 and the fifth dipole 115, the third dipole 113 is paired with the first dipole 111 and the fifth dipole 115, the fourth dipole 114 is the first dipole Paired with 111 and the second dipole 112. The fifth dipole 115 is paired with the second dipole 112 and the third dipole 113.

The actual measured pattern when calculating the phase difference with the above antenna pair is described below.

2 is an exemplary diagram comparing a phase difference pattern and actual measured patterns between dipoles of a general circular array antenna.

As shown, FIG. 2A shows an ideal phase difference pattern between dipoles of a circular array antenna, and FIG. 2B shows an actual measured phase difference pattern between dipoles of a circular array antenna. As described above, it can be seen that the phase difference pattern between dipoles of the conventional circular array antenna is large due to distortion.

As described above, the circular array antenna shows a beam pattern which is not ideal in a specific frequency band and a specific orientation in a real environment because of the influence of the center pole. This characteristic also affects the phase difference pattern, which increases the direction detection error. As the array radius of the circular array antenna increases, the influence of interference between elements and the center pole is also reduced.Because the array radius determines the direction detectable frequency range, increasing the random radius causes ambiguity in the target frequency band 100 ~ 500MHz. This will have a big impact on accuracy. Therefore, it is necessary to set a proper value within the range where the direction detection does not cause ambiguity through simulation, and to redefine the phase difference pair in order to further extend the array radius.

Accordingly, an object of the present invention is to provide an apparatus and method for expanding an array radius using a phase difference pair change to extend a radius of a phased array antenna of a propagation direction detection system.

As a technical means for achieving the above-described technical problem, the first embodiment of the present invention, in the propagation direction detection device, a circular array antenna consisting of a plurality of dipoles that can extend the array radius with the center pole, the circular A frequency converter for converting a radio frequency signal received from an array antenna into an intermediate frequency signal, and when the converted intermediate frequency signal is distorted, an array radius between the center pole and each dipole is extended, and the dipoles are adjacent to each other. It includes a direction detecting processor for detecting the propagation direction through the phase difference with the dipole.

In addition, as a technical means for achieving the above-described technical problem, the second embodiment of the present invention, in the propagation direction detection method, received from a circular array antenna consisting of a plurality of dipoles that can extend the array radius with the center pole Converting the converted radio frequency signal into an intermediate frequency signal, checking whether the converted intermediate frequency signal is distorted, and if the converted intermediate frequency signal is a distorted signal, an array radius between the center pole and each dipole And dividing the propagation direction by detecting the propagation direction through the phase difference between the dipoles and the adjacent dipoles.

According to the above-described problem solving means of the present invention to solve the problem of increasing the direction detection error by extending the array radius using a phase difference pair change to extend the radius of the phased array antenna of the propagation direction detection system, The effect is also reduced.

In addition, according to the problem solving means of the present invention described above there is an effect that the distortion of the amplitude and phase caused by the interference between the antenna elements in the conventional array antenna is significantly improved.

1 is an exemplary view showing a general circular array antenna.
Figure 2 is an exemplary view comparing the phase difference pattern and the actual measured pattern between the dipoles of a general circular array antenna.
3 is a block diagram showing a propagation direction detection system according to an embodiment of the present invention.
4 is an exemplary view illustrating a phased array antenna according to an embodiment of the present invention.
5 is a view showing a simulation result of a phase difference pattern when R = 0.5m and using D 1 according to an embodiment of the present invention.
6 is a view showing a simulation result of a phase difference pattern when R = 0.8m and D 2 according to an embodiment of the present invention.
7 is a diagram illustrating a phase difference pattern actually measured after expanding an array radius of a phased array antenna according to an exemplary embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and like reference numerals designate like parts throughout the specification.

Throughout the specification, when a part is referred to as being "connected" to another part, it includes not only "directly connected" but also "electrically connected" with another part in between . In addition, when a part is said to "include" a certain component, which means that it may further include other components, except to exclude other components unless otherwise stated.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

3 is a block diagram showing a radio wave direction detecting apparatus according to an embodiment of the present invention.

As shown, the propagation direction detecting apparatus according to an embodiment of the present invention is a frequency for receiving a radio frequency signal from the circular array antenna 310, the circular array antenna, and converts the received radio frequency signal into an intermediate frequency signal The transform unit 320, the direction detection processor 330 for detecting the direction by extending the radius of the circular array antenna through the converted frequency signal, and the final signal derivation to derive the angle of arrival of the final signal through the direction detection The unit 340 is included.

Hereinafter, a radio wave direction detecting apparatus according to an embodiment of the present invention will be described in detail with reference to FIG. 3.

First, the circular array antenna 310 according to the present invention includes a center pole 316 serving as a support in the center and interference between elements, and a first dipole 311 having an array radius of R from the center pole, respectively. And a second dipole 312, a third dipole 313, a fourth dipole 314, and a fifth dipole 315. In the present embodiment, five dipoles are taken as an example, but this is merely an embodiment, and it is obvious that the present invention may be applied to more or less than five dipoles.

Each dipole is not only distant from the center pole 316 by the array radius R, but also axially connected to the center pole. Each dipole is represented by a solid line to show a phase difference from an adjacent dipole. The center pole 316 transmits a signal received from a dipole corresponding to a phase difference pair to the frequency converter 320, respectively. The phase difference between the dipoles in which each dipole is adjacent to each other will be described later. As such, each dipole can extend the array radius with the center pole, and the circular array antenna from which the array radius can be extended consists of multiple dipoles.

When the radio frequency signal is received through the circular array antenna 310, the frequency converter 320 converts the received radio frequency signal into an intermediate frequency signal. The radio frequency signal has a bandwidth of 100 ~ 500MHz, the intermediate frequency has a bandwidth of 21.4MHz. The frequency converter 320 is provided with at least one module by the number of pairs of dipoles. As such, modules are provided by the number of dipoles, and each module receives signals from the dipoles forming the phase difference pairs.

In this way, each receiving module of the frequency converter 320 converts the radio frequency signal received from the paired dipole into an intermediate frequency signal and transmits the signal to the direction detection processor 330. The direction detection processor 330 may include a digital unit 331 for converting the received intermediate frequency into a digital value, a digital down converter 332 for down-converting the converted digital value, and a phase for each channel of the circular array antenna. A phase difference calculator 333 for extracting and calculating a phase difference, a direction detector 334 for performing direction detection based on the calculated phase difference value, and a result of the direction detection being performed through a circular array antenna. It consists of a final signal derivation unit 340 for deriving the angle of arrival of the signal. The phase difference calculator 333 extends an array radius of each dipole constituting the circular array antenna according to an embodiment of the present invention, and calculates a phase difference with an adjacent dipole. If the converted intermediate frequency signal is a distorted signal, the direction detecting processor 330 extends an array radius between the center pole and each dipole. Each dipole detects a propagation direction through a phase difference with an adjacent dipole. If the converted intermediate frequency signal is distorted, it does not extend the array radius between the center pole and each dipole. The extended array radius extends the distance of the adjacent dipole before the array radius extends by the distance of the farthest dipole. This phase difference calculation is described in detail in FIG. 4 below.

4 is an exemplary view illustrating a phased array antenna according to an embodiment of the present invention.

Hereinafter, a phased array antenna for reducing interference between dipoles and reducing phase difference distortion through a phased array antenna according to an embodiment of the present invention will be described.

Each of the dipoles 411, 412, 413, 414, 415 configured in the phased array antenna is spaced apart from the center pole 410 by an array radius R. The distance between the close dipoles is D 2 , and the distance between the furthest dipoles is D 1 .

The phase difference between the furthest dipoles may be replaced by the phase difference between adjacent dipoles through Equations 1 to 4 below.

First, the distance D 1 between the furthest dipoles is calculated by Equation 1 below.

[Equation 1]

D 1 = 2R? Sinθ 1

In Equation 1, R represents a distance between a sensor pole and a dipole, and θ 1 represents an angle formed by two dipoles viewed from the center.

The distance D 2 between adjacent dipoles is calculated through Equation 2 below.

&Quot; (2) "

D 2 = 2R? Sin (θ 1/2)

K L, which is a ratio of D 1 and D 2 through Equations 1 and 2 , is calculated through Equation 3 below.

&Quot; (3) "

Figure 112010083119625-pat00001

&Quot; (4) "

Figure 112010083119625-pat00002

As shown in Equation 4, the phase difference between the second dipole and the fourth dipole and the phase difference between the first dipole and the fifth dipole are satisfied by K L , which is a ratio of D 1 and D 2 .

Accordingly, it is, can be set by using the phase difference D 2 with a neighboring element more than the radius of the array used for a conventional D 1 of Figure 1, if greatly so as to satisfy the ratio K L of D 1 and D 2.

5 is a view showing a simulation result of the phase difference pattern when R = 0.5m and using D 1 according to an embodiment of the present invention, Figure 6 is a phase difference pattern of when R = 0.8m and using D 2 It is a figure which shows a simulation result.

As shown, the phase difference pattern when R = 0.5m and using D 1 according to an embodiment of the present invention can be represented by D 2 = 2Rcos (54 °) and when R = 0.5 in relation to D 1 You can reset the array radius R at that time by setting D 2 equal to D 1 (0.951m).

R = sin (72 °) / 2cos (54 °) = can be obtained to about 0.8m, a phase difference pattern at this time can be obtained the same pattern as with D 1 when R = 0.5 days.

As described above, each dipole forms a phase difference pair with adjacent dipoles, and Table 2 below is an exemplary diagram showing a phase difference pair between adjacent dipoles.

Phase difference pair 4-3 3-2 2-1 1-5 5-4

As shown in Table 2, the phase difference pattern measured by redefining the phase difference pair and extending the array radius is shown in FIG. 7.

FIG. 7 is a diagram illustrating a phase difference pattern actually measured after extending an array radius of a phased array antenna according to an exemplary embodiment of the present invention.

As shown in the figure, not only can the phase distortion be significantly reduced compared to the case where the array radius R is 0.5m. Also, by using the phase difference between adjacent elements, the same pattern as that of the existing phase difference pattern may be achieved even if the array radius is larger. Can be obtained. Thus, by extending the array radius R to 0.8m and separation of the band into two in the lower frequency range of the two using the D 1 and the high frequency range by using the D 2, it may extend the radius of the array ambiguity occurs in accuracy bangtam I never do that. In addition, it can be seen that as the array radius increases, interference between antenna dipoles also decreases, thereby reducing phase difference distortion, thereby improving detection accuracy.

An embodiment of the present invention may also be implemented in the form of a recording medium including instructions executable by a computer, such as a program module executed by the computer. Computer readable media can be any available media that can be accessed by a computer and includes both volatile and nonvolatile media, removable and non-removable media. In addition, the computer-readable medium may include both computer storage media and communication media. Computer storage media includes both volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data. Communication media typically includes any information delivery media, including computer readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave, or other transport mechanism.

The foregoing description of the present invention is intended for illustration, and it will be understood by those skilled in the art that the present invention may be easily modified in other specific forms without changing the technical spirit or essential features of the present invention. will be. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. For example, each component described as a single entity may be distributed and implemented, and components described as being distributed may also be implemented in a combined form.

The scope of the present invention is defined by the appended claims rather than the detailed description and all changes or modifications derived from the meaning and scope of the claims and their equivalents are to be construed as being included within the scope of the present invention do.

310: circular array antenna 320: frequency converter
330: direction detection processing unit 331: digital unit
332: digital down converter 333: phase difference calculator
334: direction detection execution unit 340: final signal derivation unit

Claims (13)

In the propagation direction detection device,
A circular array antenna consisting of a plurality of dipoles, the array radius with which the center pole can be extended,
A frequency converter for converting a radio frequency signal received from the circular array antenna into an intermediate frequency signal;
When the converted intermediate frequency signal is distorted, a propagation direction detection unit includes a direction detection processor that extends an array radius between the center pole and each dipole and detects a propagation direction through a phase difference between adjacent dipoles. Device.
The method of claim 1 wherein the extended array radius is
Propagation direction detection device characterized in that the distance of the adjacent dipole before expansion is extended by the distance of the furthest dipole.
delete The method of claim 1, wherein the direction detecting processor
And if the converted intermediate frequency signal is not a distorted signal, it does not extend an array radius between the center pole and each dipole.
The method of claim 1, wherein the direction detecting processor
A digital unit converting the converted intermediate frequency signal into a digital value;
A digital down converter for down converting the converted digital value;
A phase difference calculator for extracting a phase for each channel of the circular array antenna and calculating a phase difference between dipoles;
Propagation direction detection device comprising a direction detecting unit for detecting the propagation direction through the calculated phase difference.
The phase difference of the extended array radius is calculated by Equation 5 below.
<Equation 5>
D 2 = 2R? Sin (θ 1/2)
In Equation 5, R represents an array radius between a center pole and a dipole, and θ 1 represents an angle formed by two dipoles viewed from the center pole.
According to claim 1, wherein the ratio (K L) is <Equation 6> the bottom of the phase difference (D 2) of the said array radially adjacent after the expansion and the phase difference (D 1) of the previous furthest dipole is expanded dipole Is calculated through
&Quot; (6) &quot;
Figure 112010083119625-pat00003

In Equation 6, θ 1 represents an angle formed by two dipoles viewed from a center pole.
In the propagation direction detection method,
Converting a radio frequency signal received from a circular array antenna consisting of a plurality of dipoles with an array radius with the center pole to an intermediate frequency signal,
Checking whether the converted intermediate frequency signal is distorted;
If the converted intermediate frequency signal is a distorted signal, expanding an array radius between the center pole and each dipole;
And each dipole detecting a propagation direction through a phase difference with an adjacent dipole.
The method of claim 8, wherein the extended array radius is
A propagation direction detection method characterized in that the distance of adjacent dipoles before extension is extended by the distance of the furthest dipole.
The method of claim 8,
If the converted intermediate frequency signal is not a distorted signal, further comprising not extending an array radius between the center pole and each dipole.
The method of claim 8, wherein the detection process
Converting the converted intermediate frequency signal into a digital value;
Down converting the converted digital value;
Extracting a phase for each channel of the circular array antenna and calculating a phase difference between each dipole;
Propagation direction detection method comprising the step of detecting the propagation direction through the calculated phase difference.
The method of claim 8, wherein the phase difference of the extended array radius is calculated by Equation 7 below.
&Quot; (7) &quot;
D 2 = 2R? Sin (θ 1/2)
In Equation (7), R represents an array radius between a center pole and a dipole, and θ 1 represents an angle formed by two dipoles viewed from the center pole.
Claim 8, wherein the ratio (K L) is <Equation 6> the bottom of the phase difference (D 1) and phase difference (D 2) of the adjacent dipole after the expansion of the array radius of the prior expansion furthest dipole in Is calculated through
&Quot; (6) &quot;
Figure 112010083119625-pat00004

In Equation (6), θ 1 represents an angle formed by two dipoles viewed from a center pole.
KR1020100129262A 2010-12-16 2010-12-16 Apparatus and method for extending array radius structure using phase difference pair changing KR101170722B1 (en)

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KR101306169B1 (en) * 2013-01-15 2013-09-09 엘아이지넥스원 주식회사 Method and apparatus for detecting direction
CN103235281B (en) * 2013-04-03 2015-01-21 电子科技大学 Correlation interferometer direction-finding method based on phase difference increment
US9939513B2 (en) 2014-09-05 2018-04-10 Electronics And Telecommunications Research Institute Apparatus and method for finding hybrid direction using two baselines
CN107919535B (en) * 2017-10-12 2019-12-13 中国电子科技集团公司第三十六研究所 three-dimensional array antenna based on directional double circular arrays and construction method thereof
KR102159269B1 (en) * 2018-11-20 2020-09-23 국방과학연구소 Method and apparatus for detecting signal direction using uniform circular array antennas

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JP2009038824A (en) 2008-09-26 2009-02-19 Denki Kogyo Co Ltd Dipole horizontal array antenna apparatus

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