GB2558492A - Array antenna - Google Patents
Array antenna Download PDFInfo
- Publication number
- GB2558492A GB2558492A GB1807149.8A GB201807149A GB2558492A GB 2558492 A GB2558492 A GB 2558492A GB 201807149 A GB201807149 A GB 201807149A GB 2558492 A GB2558492 A GB 2558492A
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- array antenna
- array
- power divider
- ratio
- radiator
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/06—Arrays of individually energised antenna units similarly polarised and spaced apart
- H01Q21/061—Two dimensional planar arrays
- H01Q21/065—Patch antenna array
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/0006—Particular feeding systems
- H01Q21/0075—Stripline fed arrays
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q3/00—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
- H01Q3/26—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the relative phase or relative amplitude of energisation between two or more active radiating elements; varying the distribution of energy across a radiating aperture
- H01Q3/28—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the relative phase or relative amplitude of energisation between two or more active radiating elements; varying the distribution of energy across a radiating aperture varying the amplitude
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
- H01Q9/04—Resonant antennas
Landscapes
- Variable-Direction Aerials And Aerial Arrays (AREA)
- Waveguide Aerials (AREA)
Abstract
The present invention provides an array antenna having the properties of high gain and a low side lobe level with respect to horizontal and vertical directions on the basis of Chebyshev array functions. The array antenna comprises: a plurality of radiation elements; at least one radiation unit comprising a feeder line for connecting the plurality of radiation elements; and a power distribution unit for distributing, at a first ratio, power supplied from a feeding unit to the at least one radiation unit.
Description
[DESCRIPTION] [INVENTION TITLE] ARRAY ANTENNA [Technical Field]
The present invention relates to an array antenna in which radiating elements are arranged in series.
[Background Art! A printed micro strip type patch array antenna has been mainly used for a radar detector for a 24 GHz industrial, scientific and medical (ISM) band, in this case, for special characteristics of an antenna such as increasing a gain of the antenna or lowering a side lobe level (SLL), a complicated structure such as Chebyshev polynomial, binomial, and Taylor series needs to be applied to an array antenna. In this case, a complicated feeding circuit is required for feeding each radiating element. There is a disadvantage in that it takes long time to optimize a design and performance of the array antenna having the complicated feeding circuit.
In order to solve the above problems due to the complexity of the design, the patch array antenna for the 24 GHz band is designed so that a size and a phase of current is uniformly input to each patch. However, the array antenna in which the size and phase of the current input to the patch is uniform exhibits the high side lobe levei characteristics, so a detection area is very non-uniform. In addition, if the detection region of the radar detector is very narrow, the side lobe levei of a beam generated from the array antenna is increased, thus it is difficult to generate a beam having a narrow and uniform width by a radar algorithm alone.
[DISCLOSURE] [Technical Problem]
The present invention has been made in an effort to provide an array antenna having a high gain and Sow side lobe level characteristics.
[Technical Solution]
An exemplary embodiment of the present invention provides an array antenna, including: at least one radiator including a plurality of radiating elements and a feeding line connecting between the plurality of radiating elements; and a power divider dividing power fed from the feeder into the at least one radiator at a first ratio.
The first ratio may be determined based on an array function related to a side lobe level in a first direction which is a right direction to a direction in which the plurality of radiating elements are arranged. A conductance of the first radiating element located at a center of the radiator among the plurality of radiating elements may be larger than that of at least one second radiating element located at an edge of the radiator among the plurality of radiating elements.
The conductance of the plurality of radiating elements may be reduced at a second ratio in a second direction from the first radiating element toward the at least one second radiating element.
The second ratio may be a ratio determined based on the array function related to the side lobe level in the second direction.
The array function may be a chebyshev array function. A size of the plurality of radiating elements may be reduced at a second ratio in a second direction from the first radiating element toward the at least one second radiating element.
The second ratio may be a ratio of feeding coefficients determined based on an array factor function of the array antenna and an array function related to a side lobe level in the second direction.
The feeding coefficient may be a coefficient which is determined by comparing a coefficient of the array factor function with a coefficient of the array function.
The at least one radiator may further include a dielectric material substrate printed in a patch form.
The feeding line may control a phase of current input to the plurality of radiating elements.
The feeding line may connect between the plurality of radiating elements in series.
The power divider may match an impedance of the at Seast one radiator with the feeder.
The power divider may include: at least one first power divider providing the power divided at the first ratio to the at least one radiator; and a second power divider providing the power provided from the feeder to the at least one first power divider at the same size.
An impedance of the first power divider may be determined depending on the first ratio and a predetermined impedance constant.
[Advantageous Effects]
According to an exemplary embodiment of the present invention, it is possible to perform the intensive monitoring on the specific detection region by sharply forming the beam based on the high gain and the narrow 3dB radiation angle characteristics (HPBW3dB=4.0°). In addition, it is possible to ensure the uniform detection performance on the horizontal and vertical directions by implementing the performance less than the low side lobe level (-20 Db) in the horizontal and vertical directions based on the chebyshev array function. In the array antenna 100 according to the exemplary embodiment of the present invention, the beam having various slopes in an omindirectbn (boresight) can be formed by adjusting the phase of the current input to each radiating element and the number of radiating elements can be adjusted, thereby controlling the width of the beam. In addition, the array antenna can easily feed each radiating element based on various functions and has the printed structure, so the array antenna can be advantageous in mass production.
[Description of the Drawings] FIG. 1A is a plan view of an array antenna according to an exemplary embodiment of the present invention, and FIG. 1B is a perspective view thereof. FIG. 2 is a diagram illustrating a radiator included in the array antenna according to the exemplary embodiment of the present invention. FIG. 3 is a diagram illustrating a power divider according to an exemplary embodiment of the present invention.
[Mode for 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 practice the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, aii without departing from the spirit or scope of the present invention. Accordingly, the drawings and description are to be regarded as illustrative in nature and not restrictive. Like reference numerals designate iike elements throughout the specification. FIG, 1A is a pian view of an array antenna according to an exemplary embodiment of the present invention, and FIG. 1B is a perspective view thereof.
Referring to FIGS. 1A and 1B, an array antenna 100 according to an exemplary embodiment of the present invention includes a radiator 110, a power divider 120, and a feeder 130. The radiator 110, the power divider 120, and the feeder 130 of the array antenna 100 may be arranged on a dielectric material substrate 200 and a ground surface 300.
The radiator 110 includes a plurality of radiating elements 111 and a feeding line 112 connects between the plurality of radiating elements in series, and the array antenna 100 according to the exemplary embodiment of the present invention may include the plurality of radiators 110. The radiator 110 may be printed in a micro strip type, and a radiation conductance GR of each radiating element 111 may be adjusted according to various requirements on a design of an antenna such as a gain and side level characteristics. The feeding line 112 of the radiator 110 may adjust a phase of current input to each radiating element 111 to control a slope of a radiated beam. The feeding line 112 may be a line having a predetermined size of impedance, and the impedance of the iine according to the exemplary embodiment of the present invention may be 100 ohm.
The power divider 120 includes a first power divider 121, a second power divider 122, and a third power divider 123. The power divider 120 may transfer power, which is provided from the feeder 130, to the radiator 110. In this case, the first power divider 121 operates as an balanced power divider having a constant output power ratio (e.g., -3 dB), and the second power divider 122 and the third power divider 123 may operate as a non-baianced power divider which divides different sizes of power into each radiator 110. In addition, the second power divider 122 and the third power divider 123 may implement impedance matching of the radiator 110 with the feeder 130. According to the exemplary embodiment of the present invention, an balanced Wilkinson power divider may be used as the first power divider 121, and a non-baianced Wilkinson power divider may be used as the second power divider 122 and the third power divider 123.
The feeder 130 may transfer power, which is to be supplied to the radiator, to the power divider 120. According to the exemplary embodiment of the present invention, the feeder 130 may use a transition structure to be changed to various feeding forms such as a coaxiai iine and a coplanar waveguide (CPW). FIG. 2 is a diagram illustrating a radiator included in the array antenna according to the exemplary embodiment of the present invention.
The plurality of radiating elements 111 included in the radiator 110 according to the exemplary embodiment of the present invention are arranged in a y direction in series, and a size of the radiating elements located at a center of the plurality of radiating elements 111 is largest and the size of the radiating elements is reduced from the center toward both ends, In this case, the size of each radiating element 111 may be determined depending on the radiation conductance. Thai is, the radiating element having a large size may have a radiation conductance larger than that of the radiating element having a small size. Since the array antenna according to the exemplary embodiment of the present invention may be manufactured in a type in which it is printed on a dielectric material substrate, the size of each radiating element may be defined as a surface having an x direction length (width) and a y direction length (length). Referring to FIG. 2, the radiator 110 according to the exemplary embodiment of the present invention includes nine radiating elements E1 to E9, and the number of radiating elements may be determined according to a use purpose of the array antenna according to the exemplary embodiment of the present invention.
The radiation conductance of the plurality of radiating elements 111 included in the radiator 110 according to the exemplary embodiment of the present invention may be determined according to the array function having the low side lobe ievel characteristics. According to the exemplary embodiment of the present invention, to determine the radiation conductance, a chebyshev array function in which the side lobe level in the y direction (vertical direction) is -20 dB is used. In this case, for forward (+ z direction) directional characteristics of the array antenna 100, a slope angle of a beam may be designed to be 0° with respect to a z axis.
The following Equation 1 is an array factor (AF) of the array antenna 100 according to the exemplary embodiment of the present invention, and the size of the current applied to each radiating element 111 may be calculated based on the following Equation 1 and the chebyshev array function. (Equation 1)
(Equation 2)
in the above Equation 1, I is a current applied to each radiating element 111, and the AF is a function of Ψ. The above Equation 2 represents Ψ. Developing the above Equation 1,15 terms may be calculated as the following Equation 3. (Equation 3)
In the above Equation 2, k may be defined by a wave number (k = 2π / λ) of a beam, and d may be defined by 1/2 of a wavelength of a beam as an interval between the radiating elements 111. Therefore, a length of the feeding line (micro strip line) 112 connecting between the respective radiating elements may be designed to be a half wavelength λ / 2 of beam. In this case, although a phase of current input to each radiating element is 0°, the phase of the current may be adjusted in each radiating element depending on a radiation angle of a beam required according to use environment. In addition, the number of radiating elements, a gain, or a beam width may also be adjusted appropriately. The following Equation 4 is an Equation arranged by developing the above Equation 1, and the following Equation 5 is a 8-order chebyshev function. (Equation 4)
(Equation 5)
In the above Equations 4 and 5. comparing with coefficients of cos terms, the following Equation 8 may be obtained, (Equation 6} i0 = 2 · ij - 2 · i2 + 2 · i3 - 2 · i4 +1 ij = 4 · i2 - 9 · i3 +1.6 · i4 - 8 · x20 12 = 6*i3 — 20 - i4 +1.0-Xq 13 =8·ΐ4-4·χ* 14 = (1 /2) · x®
In this case, in the above Equation 5, xO may be determined according to the following Equation 7 by a coefficient R (R = 10~SLL! 20, a side lobe applied in a vertical direction in the exemplary embodiment of the present invention is ~ 20 dB, thus R=10-20/20=10) which may be determined depending on the number Μ (Μ " 2N + 1, according to the exemplary embodiment of the present invention, N = 4) of radiating elements and the side iobe level. (Equation 7)
Referring to the above Equation 8, according to the exemplary embodiment of the present invention, M ~ 9 and R = 10, thus xo is 1.0708. Finally, substituting xo into the above Equation 5, the size of the current applied to each radiating element 111 may be calculated according to the following Equation 8. (Equation 8) i0 = 1.4371 (i0n= 1.0000) 1,=1.3657 (iln = 0.9503) i2 = 1.1671 (i2n =0.8121) i,=0.8843 (i3n = 0.6153) i4 = 0.8643 (i4n =0.6014) in the above Equation 8, ion, iin, i2n, fan and !4n represent a size of current normalized based on a size of current of io. in this case, according to the exemplary embodiment of the present invention, the size of the current normalized for each radiating element 111 is a feeding coefficient in a vertical direction.
The foliowing Table 1 represents the feeding coefficients of each radiating element 111 and the conductance of each radiating element 111 according to the exemplary embodiment of the present invention which are calculated based on the array factor function defined in the above Equation 1. The feeding coefficient of each radiating element according to the exemplary embodiment of the present invention may be calculated by comparing the coefficient of the cos term of the array factor function of the above Equation 1 with the coefficient of the chebyshev array function, and the conductance may be calculated based on a feeding coefficient an. The following Equation 9 represents a sum of the conductance of ail the radiating elements included In the radiator 110. (Equation 9)
In the above Equation 9, the total radiation conductance Gt may be calculated based on a constant of proportionality K and the feeding coefficient an of each radiating element 111, and according to the exemplary embodiment of the present invention, a sum of the constant of proportionality and the feeding coefficient of each radiating eiement 111 is 1. The constant of proportionality obtained based on each feeding coefficient an calculated according to the above Equation 1 is as the foliowing Equation 10. (Equation 10)
Using the constant of proportionality K (0.1784), the radiation conductance normalized of each radiating element 111 may be defined according to the following Equation 11. (Equation 11) - 0.1784 <r (n = 1. ..,, 9)
According to the exemplary embodiment of the present invention, the characteristic impedance of each feeding line 112 is determined as 100[Ω], thus the normalized impedance of the feeding iine 112 is also set to be 100[Ω]. (Table 1)
Referring to the above Table 1, the radiating element according to the exemplary embodiment of the present invention, the width and the length are optimized to increase the gain of the array antenna. FIG. 3 is a diagram illustrating a power divider according to an exemplary embodiment of the present invention.
The power divider 120 according to the exemplary embodiment of the present invention may divide different sizes of power to each radiator 110. The size of power which is divided into the radiator 110 from the second power divider 122 and the third power divider 123 of the power divider 120 may be calculated based on the chebyshev array function having the side lobe level of 30 dB in the horizontal direction. In this case, the side iobe level in the horizontal direction may be determined to have the size which improve the detection performance in the horizontal direction
Referring to FiG. 3, the power divider 120 includes the first power divider 121, the second power divider 122, and third power dividers 123-1, 123-2, 123-3, and 123-4. The power divider 120 may divide the power fed from the feeder 130 to apply a current (ixi to ixg) to each radiator 110 of the array antenna 100.
The power divider 121 may operate as a balanced power divider which uses a resistor Ro to output constant power.
The second power divider 122 may output different sizes of power to each third power divider 123-1, 123-2, 123-3, and 123-4.
The third power dividers 123-1, 123-2, 123-3, and 123-4 may be operated as a non-balanced power divider which divides different sizes of power into each radiator 110. In this case, the third power dividers 123-1,123-2, 123-3, and 123-4 include resistors Ri to R4 and impedance Zir, Z’ir, Zh, Z’il, Z2R, Z'2R, Z2L. Z'2L, Z3R, Z'sR, Z3L, Z'3L, Z4R, Z'4R, Z4L, and Z’4L Which 3Γβ symmetrically disposed. That is, an n~th unit 123-n of the third power divider may use a resistor R-n and impedance ZnR, ZVr, ZnL, and Z'nL to provide power to the radiator 110 connected to the n-th unit 123-n.
Calculating the size (i.e., feeding coefficient in the horizontal direction) of the current applied to each radiator 110 in the horizontal direction using the following Equation 12 by the same method as the method for calculating a size of current applied to each of the radiating elements 111 arranged in a vertical direction, the feeding coefficient in the horizontal direction may be obtained as the following Equation 13. (Equation 12)
(Equation 13) /,,=0.6014 /,2 = 0.5730 ix 3=0.5194 /,,=0.4465 /, 5 =0.3619 '„6 =0.2741 /, 7 =0.1908 /,3=0.1750
The feeding coefficients for each radiating element included in the array antenna 100 according to the exemplary embodiment of the present invention, which are calculated using the feeding coefficients in the vertical direction of the above Equation 8 and the feeding coefficients in the horizontal direction of the above Equation 13 is as shown in the following Table 2. (Table 2)
Referring to the above Table 2, the feeding coefficients of each radiating element 111 are shown, the normalized feeding coefficients in the vertical direction of the above Equation 8 with respect to the vertical direction are applied, and the feeding coefficients in the horizontal direction of the above Equation 13 with respect to the horizontal direction are applied. For example, a feeding coefficient 0,5194 of a radiating element corresponding to E1 of a third column is 0.6014 times of a feeding coefficient 0.8637 of a radiating element corresponding to E5 of a third column, and a feeding coefficient 0,2910 of a radiating element of an eighth column among radiating elements corresponding ίο E5 of each column is 0,1750 / 0.6014 times of a feeding coefficient of a radiating element of a first column.
The third power divider 123 divides different sizes of power in the horizontal direction according to the above Equation 13, and the Impedance Zir, Zsl, Z'iR, Z'iL and R of the elements included in the third power divider 123 may be calculated based on the following Equation 14. (Equation 14)
(/ = 1.2.3.....7,8)
Referring to the above Equation 14, Zo is a predetermined impedance constant, and k represents a ratio of non-baianced power. According to the exemplary embodiment of the present invention, Zo is set to be 50Ω. k and impedance of the third power divider 123 according to the exemplary embodiment of the present invention are shown in the following Table 3 (k and impedance of the first third power divider 123-1), Table 4 (k and impedance of the second third power divider 123-2), Table 5 (k and impedance of the third third power divider 123-3), and Table 8 (k and impedance of the fourth third power divider 123-4). (Table 3)
(Table 4}
(Table 5)
(Table 8)
The array antenna 100 according to an exemplary embodiment of the present invention can perform the intensive monitoring on the specific detection region by sharply forming the beam based on the high gain and the narrow 3dB radiation angle characteristics (HPBW3dB=4.0°). Sn addition, the array antenna according to the exemplary embodiment of the present invention achieves the low side lobe levels (~30dB and -20dB), respectively, with respect to the horizontal direction and the vertical direction based on the chebyshev array function, thereby ensuring the uniform detection performance with respect to the horizontal and vertical directions, in the array antenna 100 according to the exemplary embodiment of the present invention, the beam having various slopes in an omindirection (boresight) can be formed by adjusting the phase of the current input to each radiating element and the number of radiating elements can be adjusted, thereby controlling the width of the beam. In addition, the array antenna can easily feed each radiating element based on various functions and has the printed structure, so the array antenna can be advantageous in mass production.
Although the exemplary embodiment of the present invention has been described in detail hereinabove, the scope of the present invention is not limited thereto. That is, several modifications and alterations made by those skilled in the art using a basic concept of the present invention as defined in the claims fall within the scope of the present invention.
Claims (1)
- [CLAIMS] [Claim 1 j An array antenna, comprising: at least one radiator inciuding a plurality of radiating elements and a feeding line connecting between the plurality of radiating elements: and a power divider dividing power fed from the feeder into the at (east one radiator at a first ratio. [Claim 2] The array antenna of claim 1, wherein: the first ratio is determined based on an array function related to a side lobe ievei in a first direction which is a right direction to a direction in which the plurality of radiating elements are arranged. [Claim 3] The array antenna of claim 1, wherein: a conductance of the first radiating element located at a center of the radiator among the plurality of radiating elements is larger than that of at least one second radiating element located at an edge of the radiator among the plurality of radiating elements. [Claim 4] The array antenna of claim 3, wherein: the conductance of the plurality of radiating eiements is reduced at a second ratio in a second direction from the first radiating element toward the at least one second radiating element. [Claim 5] The array antenna of claim 4, wherein: the second ratio is a ratio determined based on the array function related to the side lobe level in the second direction. [Claim 6] The array antenna of claim 2, wherein: the array function is a chebyshev array function. [Claim 7] The array antenna of ciaim 1, wherein: a size of the plurality of radiating elements is reduced at a second ratio in a second direction from the first radiating element toward the at least one second radiating eiement. [Claim 8] The array antenna of ciaim 7, wherein: the second ratio is a ratio of coefficient coefficients determined based on an array factor function of the array antenna and an array function related to a side iobe level in the second direction. [Claim 9] The array antenna of claim 8, wherein: the feeding coefficient is a coefficient which is determined by comparing a coefficient of the array factor function with a coefficient of the array function. [Claim 101 The array antenna of claim 1, wherein: the at least one radiator further includes a dielectric material substrate printed in a patch form. [Claim 111 The array antenna of claim 1, wherein: the feeding line controls a phase of current input to the plurality of radiating elements. [Claim 121 The array antenna of claim 1, wherein: the feeding line connects between the plurality of radiating elements in series. [Claim 133 The array antenna of claim 1, wherein: the power divider matches an impedance of the at least one radiator with the feeder. [Claim 14] The array antenna of claim 1, wherein: the power divider includes: at least one first power divider providing the power divided at the first ratio to the at least one radiator; and a second power divider providing the power provided from the feeder to the at least one first power divider at the same size. [Claim 15] The array antenna of claim 1, wherein: an impedance of the first power divider is determined depending on the first ratio and a predetermined impedance constant.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020150153377A KR101735782B1 (en) | 2015-11-02 | 2015-11-02 | Array antenna |
| PCT/KR2015/011712 WO2017078187A1 (en) | 2015-11-02 | 2015-11-03 | Array antenna |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB201807149D0 GB201807149D0 (en) | 2018-06-13 |
| GB2558492A true GB2558492A (en) | 2018-07-11 |
| GB2558492B GB2558492B (en) | 2022-02-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| GB1807149.8A Active GB2558492B (en) | 2015-11-02 | 2015-11-03 | Array antenna |
Country Status (4)
| Country | Link |
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| JP (1) | JP2019505106A (en) |
| KR (1) | KR101735782B1 (en) |
| GB (1) | GB2558492B (en) |
| WO (1) | WO2017078187A1 (en) |
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| CN107645066B (en) * | 2017-08-03 | 2024-06-14 | 东莞市云通通讯科技有限公司 | Communication base station antenna for improving side lobe suppression |
| CN107623192A (en) * | 2017-08-23 | 2018-01-23 | 湖南纳雷科技有限公司 | A kind of combination and the micro-strip crossfeed array antenna for presenting power division network |
| CN107658558A (en) * | 2017-09-15 | 2018-02-02 | 集美大学 | A kind of 24GHz car radars array antenna |
| KR102063467B1 (en) * | 2018-01-10 | 2020-01-08 | (주)스마트레이더시스템 | Antenna and radar apparatus having different beam tilt for each frequency |
| KR101900839B1 (en) | 2018-02-12 | 2018-09-20 | 주식회사 에이티코디 | Array antenna |
| KR102422664B1 (en) * | 2018-10-05 | 2022-07-18 | 동우 화인켐 주식회사 | Antenna structure and display device including the same |
| WO2020251064A1 (en) * | 2019-06-10 | 2020-12-17 | 주식회사 에이티코디 | Patch antenna and array antenna comprising same |
| CN111276784A (en) * | 2020-03-23 | 2020-06-12 | 深圳市豪恩汽车电子装备股份有限公司 | Microstrip array antenna and microstrip power divider thereof |
| TWI747457B (en) * | 2020-08-24 | 2021-11-21 | 智易科技股份有限公司 | Antenna for suppressing the gain of side lobes |
| KR102345362B1 (en) * | 2020-10-26 | 2021-12-29 | 연세대학교 산학협력단 | Center-fed Array Antenna using Unequal Power divider |
| CN114566795B (en) * | 2022-03-10 | 2024-07-23 | 国网陕西省电力有限公司电力科学研究院 | Flat-top directional diagram millimeter wave radar antenna and system |
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- 2015-11-02 KR KR1020150153377A patent/KR101735782B1/en active IP Right Grant
- 2015-11-03 JP JP2018522751A patent/JP2019505106A/en active Pending
- 2015-11-03 GB GB1807149.8A patent/GB2558492B/en active Active
- 2015-11-03 WO PCT/KR2015/011712 patent/WO2017078187A1/en active Application Filing
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Also Published As
| Publication number | Publication date |
|---|---|
| GB201807149D0 (en) | 2018-06-13 |
| JP2019505106A (en) | 2019-02-21 |
| WO2017078187A1 (en) | 2017-05-11 |
| KR20170051046A (en) | 2017-05-11 |
| GB2558492B (en) | 2022-02-02 |
| KR101735782B1 (en) | 2017-05-15 |
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