CN107910639A - Antenna component device and wireless telecom equipment - Google Patents
Antenna component device and wireless telecom equipment Download PDFInfo
- Publication number
- CN107910639A CN107910639A CN201711117070.5A CN201711117070A CN107910639A CN 107910639 A CN107910639 A CN 107910639A CN 201711117070 A CN201711117070 A CN 201711117070A CN 107910639 A CN107910639 A CN 107910639A
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- conductor portion
- antenna device
- feed
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- 239000004020 conductor Substances 0.000 claims abstract description 148
- 230000005855 radiation Effects 0.000 claims abstract description 35
- 239000011159 matrix material Substances 0.000 claims abstract 5
- 238000004891 communication Methods 0.000 claims description 23
- 239000000758 substrate Substances 0.000 claims description 16
- 230000008859 change Effects 0.000 abstract description 11
- 230000008878 coupling Effects 0.000 description 14
- 238000010168 coupling process Methods 0.000 description 14
- 238000005859 coupling reaction Methods 0.000 description 14
- 238000010586 diagram Methods 0.000 description 9
- 230000003071 parasitic effect Effects 0.000 description 9
- 239000003990 capacitor Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000035945 sensitivity Effects 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 239000003989 dielectric material Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000010355 oscillation Effects 0.000 description 2
- 230000008054 signal transmission Effects 0.000 description 2
- 230000003313 weakening effect Effects 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000001808 coupling effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
- H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
- H01Q1/2283—Supports; Mounting means by structural association with other equipment or articles mounted in or on the surface of a semiconductor substrate as a chip-type antenna or integrated with other components into an IC package
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/48—Earthing means; Earth screens; Counterpoises
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
Landscapes
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Details Of Aerials (AREA)
Abstract
The present invention relates to a kind of wireless telecom equipment and antenna component device, the first radiation component and the second radiation component that antenna component device includes the dielectric base body of rectangular-shape and is arranged on matrix surface and is spaced apart from each other；First radiation component includes the first antenna portion being covered on the upper surface of matrix and the first conductor portion being covered on the side surface of upper surface, and first antenna portion is connected with the first conductor portion；Second radiation component includes the second antenna part being covered on the upper surface of matrix and the second conductor portion being covered on the side surface of upper surface, and the second antenna part is connected with the second conductor portion；In the adjacent of the first conductor portion and the second conductor portion, the width of the first conductor portion gradually increases along the direction away from upper surface.The impedance continuity for the antenna conductor widened with frequency change it is gentler, so as to gradually reduce the sensitiveness that antenna conductor changes frequency, it is ensured that the job stability of antenna assembly.
Description
Technical Field
The invention relates to the field of wireless communication, in particular to a chip antenna device and wireless communication equipment.
Background
In the field of wireless communication, for example, wireless communication devices having a wireless communication function, such as mobile phones (including smartphones), tablet PCs, and smartwatches, one or more antenna devices are provided inside the wireless communication devices, and thus, the miniaturization of the devices, which is currently being performed, is also demanding the miniaturization and thinning of the antenna devices. Thus, chip antenna devices are widely used in the field of wireless communication, and chip antennas generally include a dielectric substrate, and a radiating element and a parasitic element provided on a surface of the dielectric substrate, wherein the radiating element performs signal transmission and reception, and the parasitic element is electromagnetically fed by coupling with the radiating element to match resonance to adjust the bandwidth and frequency of the antenna.
However, whether the parasitic element and the radiating element are matched can affect the adjustment of the bandwidth and the frequency of the antenna to a great extent, and for the radiating element, if the matching is not good, the radiation power of the antenna is reduced, the loss on the feeder is increased, the power capacity of the feeder is also reduced, and in severe cases, the phenomenon of transmitter frequency "pulling" occurs, that is, the oscillation frequency is changed. Therefore, matching or coupling between the parasitic element and the radiating element will affect the stability of the operation of the antenna device and the radiation efficiency.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide a chip antenna device and a wireless communication device, aiming at the problem of how to ensure the stable operation of the antenna device in the prior art.
The technical scheme adopted by the invention for solving the technical problems is as follows: a chip antenna device is provided, including a dielectric base body in a rectangular parallelepiped shape, and a first radiation member and a second radiation member provided on a surface of the base body and spaced apart from each other; wherein,
the first radiation member includes a first antenna portion covering an upper surface of the base body and a first conductor portion covering a side surface perpendicular to the upper surface, the first antenna portion being connected to the first conductor portion; the second radiation member includes a second antenna portion covered on an upper surface of the base and a second conductor portion covered on a side surface perpendicular to the upper surface, the second antenna portion being connected to the second conductor portion;
the width of the first conductor portion gradually increases in a direction away from the upper surface at a position adjacent to the first conductor portion and the second conductor portion.
Preferably, the first conductor portion includes a feeding conductor connected to a feeding source and a first grounding conductor grounded; the first ground conductor is adjacent to the second conductor portion, and the width of the first ground conductor gradually increases in a direction away from the upper surface.
Preferably, the first conductor portion includes a feeding conductor connected to a feeding source and a first grounding conductor grounded; the feed conductor is adjacent to the second conductor portion, and the width of the feed conductor gradually increases in a direction away from the upper surface.
Preferably, the second conductor portion includes a grounded second ground conductor, and a width of the second ground conductor gradually increases in a direction away from the upper surface.
Preferably, a matching conductor is connected transversely between the feed conductor and the first ground conductor.
Preferably, the feed conductor and the first ground conductor are spaced apart from each other.
Preferably, the first conductor portion and the second conductor portion are located on the same side surface of the dielectric base.
Preferably, the first radiation part is formed by bending one conductive plate, and the second radiation part is formed by bending the other conductive plate.
Preferably, the first radiating element is spaced from the second radiating element by a recess which extends through the entire upper surface.
The invention also provides wireless communication equipment which comprises a circuit substrate and the chip antenna device, wherein the chip antenna device is arranged on the circuit substrate.
The implementation of the invention has the following beneficial effects: when the diameter or width of the conductor in the antenna device is large, the input impedance changes gently with frequency. Therefore, the width of the first conductor part is increased along the direction far away from the upper surface, namely, the width of the first conductor part is gradually increased along the direction far away from the connection part of the first antenna part, so that the impedance of the antenna conductor part is continuously more gradual along with the frequency change, the sensitivity of the antenna conductor to the frequency change is gradually reduced, and the working stability of the antenna device is ensured. In addition, in order to achieve matching between the radiating element and the parasitic element, the input impedance of the antenna device should be matched with the characteristic impedance of the feed line conductor, where the impedance changes continuously as the width of the first conductor portion increases, reducing the possibility of sudden or abrupt changes in impedance during operation, where signals can be transferred more continuously, avoiding as much as possible the occurrence of impedance mismatches. Therefore, after impedance matching is ensured, no reflected wave can appear on the feeder line, loss of extra generated useless reflected waves to radiation is avoided, and radiation efficiency is ensured.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
fig. 1 is a schematic diagram of a wireless communication device according to a first embodiment of the present invention;
fig. 2 is a schematic diagram of the chip antenna arrangement of fig. 1;
fig. 3 is a sectional view of a chip antenna device of a wireless communication apparatus according to a second embodiment of the present invention, taken along a direction perpendicular to a circuit substrate;
fig. 4 is a schematic diagram of a wireless communication device according to a third embodiment of the present invention;
fig. 5 is a schematic diagram of a wireless communication device according to a fourth embodiment of the present invention;
fig. 6 is a schematic diagram of a wireless communication device according to a fifth embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, fig. 1 shows a schematic diagram of a wireless communication device according to a first embodiment of the present invention, the wireless communication device includes a chip antenna device 1 and a circuit substrate 2, the chip antenna device 1 is disposed on the circuit substrate 2, and the circuit substrate 2 may be a PCB board. The chip antenna device 1 includes a dielectric substrate 11 having a rectangular parallelepiped shape, and a first radiation member 12 and a second radiation member 13 provided on a surface of the substrate 11 and spaced apart from each other. The first radiation member 12 includes a first antenna portion 121 covered on the upper surface 111 of the base 11 and a first conductor portion 122 covered on the side surface 112 perpendicular to the upper surface 111, the first antenna portion 121 being connected to the first conductor portion 122; the second radiation member 13 includes a second antenna portion 131 covered on the upper surface 111 of the base 11 and a second conductor portion 132 covered on the side surface 112 perpendicular to the upper surface 111, the second antenna portion 131 being connected to the second conductor portion 132; adjacent the first conductor portion 122 and the second conductor portion 132, the width of the first conductor portion 122 increases in a direction away from the upper surface 111.
The first antenna portion 121 is connected to a power supply and a ground through the first conductor portion 122, and functions as a radiation element in operation; the second antenna portion 131 is grounded via the second conductor portion 132, and the second antenna portion 131 is not connected to a power supply and functions as a parasitic element in operation. The first conductor portion 122 is adjacent to the second conductor portion 132 and generates electromagnetic coupling by which the parasitic element obtains a feed. On a secondary basis, the matching shape between the first conductor part 122 and the second conductor part 132 is adjusted reasonably, so that the first radiation member 12 and the second radiation member 13 resonate at the same operating frequency, thereby realizing adjustment of the frequency and the bandwidth of the chip antenna device 1 (may be simply referred to as an antenna device).
It is known that the input impedance of an antenna conductor varies more gradually with frequency when the diameter or width of the conductor is larger. Thus, at least a portion of the first conductor portion 122 adjacent to the second conductor portion 132 has a width that increases in a direction away from the upper surface 111, that is, gradually increases in a direction away from the connection with the first antenna portion 121, so that the impedance of the antenna conductor is continuously more gradual with frequency changes, and the sensitivity of the antenna conductor to frequency changes is gradually reduced, thereby ensuring the operational stability of the antenna device. In addition, in order to achieve matching between the radiating element and the parasitic element, the input impedance of the antenna device should be matched with the characteristic impedance of the feed line conductor, where the impedance changes continuously as the width of the first conductor part 122 increases gradually, reducing the possibility of sudden or abrupt change of the impedance during operation, and enabling more continuous signal transmission therein, avoiding as much as possible the occurrence of impedance mismatch. Therefore, after impedance matching is ensured, no reflected wave can appear on the feeder line, loss of extra generated useless reflected waves to radiation is avoided, and radiation efficiency is ensured.
Specifically, the base 11 is made of a dielectric material, such as a ceramic material or a magnetic dielectric material, the higher the dielectricity of which is, the smaller the physical size of the base 11 is. The base 11 has a rectangular parallelepiped shape and includes an upper surface 111 and a lower surface which are parallel, and a side surface 112 which is parallel to the upper surface 111 and the lower surface. The lower surface is in contact with a circuit substrate 22, such as a PCB circuit board, so that the antenna device 1 is provided on the circuit substrate 22.
The first radiation member 12 is bent by one conductive plate, and the second radiation member 13 is bent by the other conductive plate. The conductive plate used for manufacturing the first radiation member 12 or the second radiation member 13 is a conductive metal thin plate, and may be, for example, a copper plate, a steel plate, a SUS plate, or the above-described metal plate subjected to plating treatment. The thickness of the conductive plate is as thin as possible, for example, 1mm or less, preferably 0.4mm or less.
The first antenna portion 121 and the second antenna portion 131 are both disposed on the upper surface 111 of the substrate 11, and are spaced apart from each other as two independent portions. The first conductor portion 122 and the second conductor portion 132 are located on the same side surface 112. In a specific embodiment, the first antenna portion 121 and the second antenna portion 131 may be spaced apart from each other by a groove 14 on the upper surface 111, the groove 14 penetrating the entire upper surface 111 to separate the two radiating portions. The width of the groove 14 will affect the natural frequency of the antenna, and the narrower the groove 14, the smaller the natural frequency of the antenna, so it can be seen that the antenna with different natural frequencies can be obtained by simply changing the structural parameters of the groove, the process difficulty is low, and the implementation is easy.
Referring to fig. 2, the first conductor portion 122 includes a feed conductor 1221 connected to the feed source FD, and a first ground conductor 1222 grounded; the first ground conductor 1222 is adjacent to the second conductor portion 132, and the width of the first ground conductor 1222 gradually increases in a direction away from the upper surface 111. In one embodiment, a matching conductor 1223 is connected laterally between the feed conductor 1221 and the first ground conductor 1222. Here, the feed conductor 1221, the matching conductor 1223, the first ground conductor 1222, and the second conductor portion 132 cooperate to form a feed circuit in which the first ground conductor 1222 and the second conductor portion 132 form a capacitive electromagnetic coupling therebetween, which is equivalent to a capacitor connected between the two ground conductors, and the feed conductor 1221 is connected to a feed source, so that the matching and gain of the antenna can be adjusted by adjusting the shapes (e.g., conductor width and conductor length) of the respective conductors constituting the capacitive coupling and the intervals between the conductors based on a capacitance formula, thereby adjusting the resonance frequency and bandwidth.
Referring to fig. 3 showing a cross-sectional view of a chip antenna device 1 of a wireless communication apparatus according to a second embodiment of the present invention taken along a direction perpendicular to a circuit substrate 2, the same structural parts as those of the first embodiment are kept the same reference numerals, and different structural parts are distinguished by different reference numerals. The difference from the wireless communication device shown in fig. 1 and 2 is that at least one of the first antenna portion 121 and the second antenna portion 131 is slidable on the upper surface of the base body 11, for example, both antenna portions are slidable, specifically, slidable in a direction parallel to the side surface 112. The first antenna part 121 and/or the second antenna part 131 can change the area of shielding or covering the groove 14 by the above sliding, and accordingly change the area or width of the groove 14 exposed between the first antenna part 121 and the second antenna part 131. As can be seen from the foregoing, the width of the groove 14 is related to the natural frequency of the antenna, and the narrower the groove 14, the smaller the natural frequency of the antenna. Based on this, it is possible to change the width of the groove 14 by sliding the first antenna part 121 and/or the second antenna part 131, and then to realize adjustment of the natural frequency of the antenna. The chip antenna device with adjustable natural frequency has wider application range and flexible use. In a specific application, a person skilled in the art can set some notches 14 according to specific parameters of the antenna to correspond to specific natural frequencies, so as to facilitate adjustment.
Referring to fig. 4, which shows a schematic diagram of a wireless communication device according to a third embodiment of the present invention, the same structural parts as those of the first embodiment are kept the same reference numerals, and different structural parts are provided with different reference numerals to distinguish them. In this embodiment, the second conductor portion 132 includes a grounded second ground conductor 132a, and the width of the second ground conductor 132a gradually increases in a direction away from the upper surface 111.
The second ground conductor 132a is gradually widened and, similarly, the impedance thereof is continuously more gradual with the frequency change, so that the sensitivity of the antenna conductor to the frequency change is gradually reduced, and the operational stability of the antenna device is ensured. In addition, the gradually increasing width of the second ground conductor 132a also allows the signal to be transmitted more continuously therein, so as to avoid impedance mismatch as much as possible. Therefore, after impedance matching is ensured, the situation that reflected waves do not appear on the feeder line is ensured as far as possible, loss of extra generated useless reflected waves to radiation is avoided, and radiation efficiency is ensured. Likewise, the gradually widening portion further reduces the gap between the first conductor portion 122 and the second conductor portion 132, and the reduction in the gap may enhance electromagnetic coupling.
At the same time, the width of the portion of the first conductor 122 adjacent to the second ground conductor 132a is gradually increased in a direction away from the upper surface 111, so that the shape of the gap space between the two portions is approximately an inverted triangle (or inverted trapezoid), which is referred to as "inverted" with respect to the direction in which the width of the first conductor or the second conductor is increased. If the angles between the two adjacent edges of the second ground conductor and the first conductor portion are equal to the upper surface, the width of the portion of the first conductor 122 adjacent to the second ground conductor 132a gradually and uniformly increases along the direction away from the upper surface 111. It is known that the further away the conductor part is from the antenna part, the coupling effect thereof may have a somewhat reduced effect on the effect of the resonance between the radiating elements. The gap space is a coupling space, and the distribution morphology of electromagnetic coupling is determined by the spatial morphology, and at this time, the coupling morphology gradually increases the coupling strength along a direction away from the upper surface 111, or even gradually and uniformly increases the coupling strength along a direction away from the antenna portion, so that the weakening of resonance caused by the distance from the antenna portion is compensated, and the resonance of the first radiation part 12 and the second radiation part 13 is more stable. Compared with the prior art in which the coupling strength is not changed in the direction away from the antenna portion, the frequency and bandwidth of the chip antenna device of the present embodiment are more stable. Meanwhile, the change of the coupling morphology caused by the conductor widening structure is slight, the weakening of resonance caused by the distance from the antenna part is only compensated, and obvious oscillation change can not be generated on the resonance, so that the whole working condition of the chip antenna device can not be influenced.
Referring to fig. 5, which shows a schematic diagram of a wireless communication device according to a fourth embodiment of the present invention, the same structural parts as those of the first embodiment are kept the same reference numerals, and different structural parts are distinguished by different reference numerals. In this embodiment, the feeding conductor 1221a and the first ground conductor 1222a are spaced apart from each other, which is equivalent to a parallel plate capacitor formed between the feeding conductor 1221a and the first ground conductor 1222a, and the two are connected by a capacitor. By adding a capacitive connection to the formed feed circuit, the electromagnetic coupling between the parasitic element and the radiating element can be changed accordingly, whereby the resonant frequency and bandwidth of both can be adjusted.
Referring to fig. 6, which shows a schematic diagram of a wireless communication device according to a fifth embodiment of the present invention, the same structural parts as any of the first to third embodiments are kept the same reference numerals, and different structural parts are distinguished by different reference numerals. In this embodiment, the first conductor part 122 includes a feeding conductor 1221b connected to a feeding source, and a first grounding conductor 1222b grounded; the feed conductor 1221b is adjacent to the second conductor portion 132, and the width of the feed conductor 1221b gradually increases in a direction away from the upper surface 111. The widening of the feed conductor 1221b may also have the same or similar effect as the widening of the first ground conductor 1222, and will not be described in detail herein.
It is to be understood that the foregoing examples, while indicating the preferred embodiments of the invention, are given by way of illustration and description, and are not to be construed as limiting the scope of the invention; it should be noted that, for those skilled in the art, the above technical features can be freely combined, and several changes and modifications can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention; therefore, all equivalent changes and modifications made within the scope of the claims of the present invention should be covered by the claims of the present invention.
Claims (10)
1. A chip antenna device is characterized by comprising a dielectric matrix in a rectangular parallelepiped shape, and a first radiation member and a second radiation member which are arranged on the surface of the matrix and are spaced from each other; wherein,
the first radiation member includes a first antenna portion covering an upper surface of the base body and a first conductor portion covering a side surface perpendicular to the upper surface, the first antenna portion being connected to the first conductor portion; the second radiation member includes a second antenna portion covered on an upper surface of the base and a second conductor portion covered on a side surface perpendicular to the upper surface, the second antenna portion being connected to the second conductor portion;
the width of the first conductor portion gradually increases in a direction away from the upper surface at a position adjacent to the first conductor portion and the second conductor portion.
2. The chip antenna device according to claim 1, wherein the first conductor portion includes a feed conductor connected to a feed source and a first ground conductor grounded; the first ground conductor is adjacent to the second conductor portion, and the width of the first ground conductor gradually increases in a direction away from the upper surface.
3. The chip antenna device according to claim 1, wherein the first conductor portion includes a feed conductor connected to a feed source and a first ground conductor grounded; the feed conductor is adjacent to the second conductor portion, and the width of the feed conductor gradually increases in a direction away from the upper surface.
4. A chip antenna device according to claim 2 or 3, wherein the second conductor portion includes a grounded second ground conductor, and a width of the second ground conductor is gradually increased in a direction away from the upper surface.
5. The chip antenna device according to claim 4, wherein two adjacent edges of the second ground conductor and the first conductor portion respectively have an equal angle with the upper surface.
6. A chip antenna arrangement according to claim 2 or 3, characterized in that a matching conductor is connected transversely between the feed conductor and the first ground conductor.
7. A chip antenna arrangement according to claim 2 or 3, characterized in that the feed conductor and the first ground conductor are spaced apart from each other.
8. The chip antenna device according to claim 1, wherein the first antenna portion is spaced apart from the second antenna portion by a groove that extends through the entire upper surface.
9. The chip antenna device according to claim 8, wherein at least one of the first antenna portion and the second antenna portion changes an area that blocks the groove by sliding on the upper surface.
10. A wireless communication device comprising a circuit substrate and the chip antenna device of any one of claims 1-9, the chip antenna device being disposed on the circuit substrate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711117070.5A CN107910639A (en) | 2017-11-13 | 2017-11-13 | Antenna component device and wireless telecom equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711117070.5A CN107910639A (en) | 2017-11-13 | 2017-11-13 | Antenna component device and wireless telecom equipment |
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| Publication Number | Publication Date |
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| CN107910639A true CN107910639A (en) | 2018-04-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711117070.5A Pending CN107910639A (en) | 2017-11-13 | 2017-11-13 | Antenna component device and wireless telecom equipment |
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| Country | Link |
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| CN (1) | CN107910639A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023202457A1 (en) * | 2022-04-20 | 2023-10-26 | 维沃移动通信有限公司 | Antenna module and electronic device |
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Application publication date: 20180413 |
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