CN103022714A - Amplitude impedance calibrated planar horn antenna - Google Patents
Amplitude impedance calibrated planar horn antenna Download PDFInfo
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- CN103022714A CN103022714A CN2012105640471A CN201210564047A CN103022714A CN 103022714 A CN103022714 A CN 103022714A CN 2012105640471 A CN2012105640471 A CN 2012105640471A CN 201210564047 A CN201210564047 A CN 201210564047A CN 103022714 A CN103022714 A CN 103022714A
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Abstract
The invention relates to a planar horn antenna, in particular to an amplitude impedance calibrated planar horn antenna which comprises a micro-strip feeder (1), a horn antenna (2) and metalized via holes (3), wherein the micro-strip feeder (1), the horn antenna (2) and the metalized via holes (3) are integrated on a dielectric substrate (4). The micro-strip feeder (1) is connected with an antenna port (5) and an antenna narrow port (6), the horn antenna (2) comprises a first metal plane (8), a second metal plane (10) and two rows of metalized via side walls (11), a middle metalized via array (15), a left metalized via array (21) and a right metalized via array (22) consist of the metalized via holes (3) and form four dielectric filling waveguides in the horn antenna (2), one end of each of the four dielectric filling waveguides is close to the antenna narrow port (6), the other end of each of the four dielectric filling waveguides is positioned on an antenna caliber surface (20), and the width of the dielectric filling waveguides enables wave impedance of the dielectric filling waveguides to be equal to free space wave impedance. Antenna caliber efficiency can be improved while return loss is reduced.
Description
Technical field
The present invention relates to a kind of plane horn antenna, especially a kind of plane horn antenna of amplitude impedance calibration.
Background technology
Horn antenna has a wide range of applications in the systems such as satellite communication, terrestrial microwave link and radio telescope.But, the larger physical dimension of three-dimensional horn antenna and with the incompatible of planar circuit technique so that its cost is higher, thereby limited the development of its application.In recent years, the proposition of substrate integrated waveguide technology and development have well promoted the development of plane horn antenna.Substrate integration wave-guide have size little, lightweight, be easy to the advantages such as Planar integration and processing and fabricating be simple.Based on the substrate integration wave-guide plane horn antenna of substrate integration wave-guide except the characteristics with horn antenna, miniaturization, the lightness of horn antenna have also well been realized, and be easy to be integrated in the microwave and millimeter wave planar circuit, but the gain of traditional substrate integration wave-guide plane horn antenna is relatively low, its reason is because horn mouth constantly opens, cause electromagnetic wave impedance on the bore face to be different from the wave impedance of free space, caused reflection of electromagnetic wave at medium and loudspeaker interface, affected return loss and the radiance of antenna; The amplitude of electromagnetic field is also very inhomogeneous on the bore face in addition, narrowing toward each end broad in the middle, and this also affects the radiance of antenna.The methods such as at present existing employing medium loading, medium prism, correct the asynchronous of loudspeaker bore field phase, but these methods all can not be improved the inconsistent of horn antenna and free space wave impedance on the bore face, can not improve the uniformity that electromagnetic field magnitude distributes on the bore face, and these phase alignment structures have increased the overall structure size of antenna.
Summary of the invention
Technical problem: the plane horn antenna that the objective of the invention is to propose a kind of amplitude impedance calibration, this plane horn antenna inside is embedded with inconsistent in order to the inconsistent and antenna of electromagnetic amplitude on the RECTIFYING ANTENNA bore face and free space wave impedance of metallization arrays of vias, increase aperture efficiency and the gain of antenna, reduce the reflection of antenna.
Technical scheme: the plane horn antenna of amplitude impedance calibration of the present invention comprises microstrip feed line, substrate integration wave-guide horn antenna and the embedded metal via hole that is arranged on the medium substrate; One end of described microstrip feed line is the input/output port of antenna, and the narrow port of the other end of microstrip feed line and substrate integration wave-guide horn antenna joins; The substrate integration wave-guide horn antenna is comprised of with the two row's metallization via hole loudspeaker sidewalls that are connected medium substrate and connect the first metal flat and the second metal flat the first metal flat that is positioned at medium substrate one side, the second metal flat of being positioned at the medium substrate another side; Embedded metallization via hole connects the first metal flat and the second metal flat in the substrate integration wave-guide horn antenna, and consists of the metallization arrays of vias; Intermediate metallization arrays of vias, left side metallization arrays of vias and the right metallization arrays of vias form first medium and fill waveguide, second medium filling waveguide, the 3rd dielectric-filled waveguide and the 4th dielectric-filled waveguide in horn antenna.
In the metallization arrays of vias, the intermediate metallization arrays of vias is positioned at the middle position of two sidewalls of substrate integration wave-guide horn antenna, and the substrate integration wave-guide horn antenna is divided into symmetrical two parts, in the both sides of the metallization arrays of vias of centre, symmetrical have left side dielectric-filled waveguide and a right dielectric-filled waveguide.
Intermediate metallization arrays of vias shape is one section straight line, and the head end of intermediate metallization arrays of vias is near the narrow port of substrate integration wave-guide horn antenna, and the tail end of intermediate metallization arrays of vias is at the antenna opening diametric plane.
In the metallization arrays of vias, metallization arrays of vias in the left side is divided into first medium to left side dielectric-filled waveguide and fills waveguide and second medium filling waveguide, and the right metallization arrays of vias is divided into the 3rd dielectric-filled waveguide and the 4th dielectric-filled waveguide to the dielectric-filled waveguide on the right; First medium is filled a end that waveguide, second medium fill waveguide, the 3rd dielectric-filled waveguide and the 4th dielectric-filled waveguide all towards the direction of the narrow port of antenna, its other end all on the antenna opening diametric plane, and four dielectric-filled waveguides, with the same at the width of antenna opening diametric plane upper port.
Metallization arrays of vias in the left side all is to be linked to each other with three sections of tail end straightways by head end straightway, polygon to consist of with the right metallization arrays of vias shape; Head end straightway in left side metallization arrays of vias and the right metallization arrays of vias or the shape of tail end straightway can be straight line, broken line or exponential line etc., and its length can be zero or finite length; Polygon in left side metallization arrays of vias and the right metallization arrays of vias can be triangle, quadrangle, pentagon or other polygon, and the shape on a polygonal limit or many limits can be straight line, camber line or other curve.The head end of left side metallization arrays of vias and the right metallization arrays of vias is the direction of the narrow port of close horn antenna all, and the tail end of left side metallization arrays of vias and the right metallization arrays of vias is on the antenna opening diametric plane.
Left side dielectric-filled waveguide, the right dielectric-filled waveguide, first medium fill waveguide, second medium fill the width of waveguide, the 3rd dielectric-filled waveguide and the 4th dielectric-filled waveguide all to guarantee its main mould can the on the left side dielectric-filled waveguide, the right dielectric-filled waveguide, first medium fill waveguide, second medium is filled transmission in waveguide, the 3rd dielectric-filled waveguide and the 4th dielectric-filled waveguide and is not cut off.
Position in the selection left side metallization arrays of vias in head end straightway or the polygon on the left side dielectric-filled waveguide equates so that fill the electromagnetic power that transmits in waveguide and the second medium filling waveguide at first medium.
Select the on the right position in the dielectric-filled waveguide of head end straightway in the right metallization arrays of vias or polygon, so that the electromagnetic power that transmits equates in the 3rd dielectric-filled waveguide and the 4th dielectric-filled waveguide.
Two row metallization via hole loudspeaker sidewalls, flare up is tubaeform and then connect one section wide parallel-segment and consist of gradually to connect one section by one section narrow parallel-segment.
First medium is filled waveguide, second medium is filled waveguide, the 3rd dielectric-filled waveguide and the 4th dielectric-filled waveguide all equal free space in the wave impedance of the port of antenna opening diametric plane wave impedance.
In the metallization via hole loudspeaker sidewall, the spacing of two adjacent metallization via holes is less than or equals 1/10th of operation wavelength, so that the metallization via hole loudspeaker sidewall that consists of can equivalence be electric wall; The spacing of two adjacent metallization via holes will be equal to or less than 1/10th of operation wavelength, so that the intermediate metallization arrays of vias that consists of, left side metallization arrays of vias and the right metallization arrays of vias can equivalence be electric wall.
In dielectric-filled waveguide, the wave impedance of electromagnetic wave master mould (TE10 mould) is relevant with the width of dielectric-filled waveguide, and the width of dielectric-filled waveguide is wider, and the wave impedance of main mould is just lower; Otherwise the width of dielectric-filled waveguide is narrower, and the wave impedance of main mould is just higher.Electromagnetic wave is from the end input of microstrip feed line, the other end through microstrip feed line enters the substrate integration wave-guide horn antenna, after propagating a segment distance, the metallization arrays of vias in the middle of running into, two dielectric-filled waveguides transmission about the two-way that just minute success rate is equal enters respectively.About two dielectric-filled waveguide full symmetrics, take the dielectric-filled waveguide on the left side as the example explanation.Enter when electromagnetic wave after the dielectric-filled waveguide transmission on the left side behind the segment distance, will run into the arrays of vias that metallizes, be divided into again two-way and transmit to the bore face by dielectric-filled waveguide; Adjust the position of polygon vertex in the position of dielectric-filled waveguide of this metallization arrays of vias head end on the left side and the metallization arrays of vias, can guarantee to equate by the electromagnetic power of two dielectric-filled waveguides transmission; Transmission also is same situation in the electromagnetic wave dielectric-filled waveguide on the right, like this at the equal port of four width of bore face of antenna, electromagnetic amplitude is all consistent, and then reach the aperture efficiency of raising antenna and the purpose of gain, and owing to the port width a of dielectric-filled waveguide satisfies condition
Be that port width a equals free space wavelength λ except subtracting 1 subduplicate twice in medium relative dielectric constant ε, so the wave impedance of electromagnetic wave in dielectric-filled waveguide equal the wave impedance of free space, the reflection of antenna opening diametric plane is just little like this.
Beneficial effect: the beneficial effect of the plane horn antenna of amplitude impedance calibration of the present invention is, improved the antenna opening diametric plane power on magnetic wave amplitude consistency, simultaneously again so that on the bore face the electromagnetic wave impedance of antenna equal the wave impedance of free space, thereby increased the gain of antenna and reduced the return loss of antenna.
Description of drawings
Fig. 1 is the plane horn antenna face structural representation of amplitude impedance calibration.
Fig. 2 is the plane horn antenna reverse side structural representation of amplitude impedance calibration.
Have among the figure: microstrip feed line 1, substrate integration wave-guide horn antenna 2, embedded metal via hole 3, medium substrate 4, the input/output port 5 of antenna, the narrow port 6 of antenna 2, conduction band 7, the first metal flat 8, ground plane 9, the second metal flat 10, metallization via hole loudspeaker sidewall 11, the narrow parallel-segment 12 of antenna, the wide parallel-segment 13 of antenna, metallization arrays of vias 14, intermediate metallization arrays of vias 15, left side dielectric-filled waveguide 16, the right dielectric-filled waveguide 17, the head end 18 of intermediate metallization arrays of vias straight line, the tail end 19 of intermediate metallization arrays of vias straight line, the bore face 20 of antenna, left side metallization arrays of vias 21, the right metallization arrays of vias 22, first medium is filled waveguide 23, second medium is filled waveguide 24, the 3rd dielectric-filled waveguide 25 and the 4th dielectric-filled waveguide 26.
Embodiment
The invention will be further described below in conjunction with drawings and Examples.
Embodiment of the present invention is: the plane horn antenna of amplitude impedance calibration comprises microstrip feed line 1, substrate integration wave-guide horn antenna 2 and embedded metal via hole 3, this three part all is integrated on the same medium substrate 4, one end of microstrip feed line 1 is the input/output port 5 of antenna, the narrow port 6 of the other end of microstrip feed line 1 and substrate integration wave-guide horn antenna 2 joins, the conduction band 7 of microstrip feed line 1 joins with the first metal flat 8 of substrate integration wave-guide horn antenna, and the ground plane 9 of microstrip feed line 1 joins with the second metal flat 10 of substrate integration wave-guide horn antenna; Substrate integration wave-guide horn antenna 2 is comprised of two metal flats 8 and 10 and two row's metallization via hole loudspeaker sidewalls 11, two metal flats 8 and 10 lay respectively at the two sides of medium substrate 4, the two row metallization via sidewall 11 that connect two metal flats 8 and 10 consisted of one section narrow parallel-segment 12, flare up is tubaeform and then become one section wide parallel-segment 13 gradually more before this; Metallization via hole 3 embedded in substrate integration wave-guide horn antenna 2 connects two metal flats 8 and 10, and these embedded metallization via holes 3 consist of three metallization arrays of vias 14; Metallization arrays of vias 15 in the middle of wherein is positioned at the position in the middle of the horn antenna two side 11, and in the both sides of the metallization arrays of vias 15 of centre, symmetrical have left side dielectric-filled waveguide 16 and a right dielectric-filled waveguide 17; Intermediate metallization arrays of vias 15 shapes are one section straight lines, and the head end 18 of intermediate metallization arrays of vias straight line is near the narrow port 6 of horn antenna, and the tail end 19 of intermediate metallization arrays of vias straight line reaches the bore face 20 of horn antenna; A metallization arrays of vias 21 is arranged in the dielectric-filled waveguide 16 on the horn antenna left side, dielectric-filled waveguide 16 is divided into first medium fills waveguide 23 and second medium filling waveguide 24; In the dielectric-filled waveguide 17 on horn antenna the right, a metallization arrays of vias 22 is arranged, dielectric-filled waveguide 17 is divided into the 3rd dielectric-filled waveguide 25 and the 4th dielectric-filled waveguide 26; Metallization arrays of vias 21 and 22 shapes all are that a paragraph header end straightway connects polygon and connects one section tail end straightway again, these metallization arrays of vias 21 and 22 head end all near the tail end of the direction of the narrow port 6 of horn antenna 2, metallization arrays of vias 21 and 22 on the bore face 20 of horn antenna 2; These metallization arrays of vias 15,21 and 22 are divided into the dielectric-filled waveguide 23,24,25 and 26 that four width equate to the wide parallel-segment 13 of antenna 2, and the width of setting dielectric-filled waveguide is so that dielectric-filled waveguide 23,24,25 and 26 all equals the wave impedance of free space in the wave impedance of antenna opening diametric plane.
In dielectric-filled waveguide, the propagating wave impedance of electromagnetic wave master mould (TE10 mould) is all relevant with the width of dielectric-filled waveguide, and the width of dielectric-filled waveguide is wider, and the wave impedance of main mould is just lower; Otherwise the dielectric-filled waveguide width is narrower, and the wave impedance of main mould is just higher.Electromagnetic wave enters an end of microstrip feed line 1 from the port 5 of antenna, enter the narrow port 6 of substrate integration wave-guide horn antenna 2 through microstrip feed line 1, after propagating a segment distance, run into intermediate metallization arrays of vias 15, because symmetry, the electromagnetic wave two-way that just minute success rate is equal enters respectively left side dielectric-filled waveguide 16 and 17 transmission of the right dielectric-filled waveguide.About two dielectric-filled waveguides 16 and 17 full symmetrics, take the dielectric-filled waveguide 16 on the left side as the example explanation, enter when electromagnetic wave after dielectric-filled waveguide 16 transmission on the left side behind the segment distance, to run into left side metallization arrays of vias 21, be divided into again two-way respectively by dielectric-filled waveguide 23 and the 24 direction transmission to antenna opening diametric plane 20, adjust metallization arrays of vias 21 in the dielectric-filled waveguide 16 on the left side head-end location and the position of polygon vertex, can so that the electromagnetic power by dielectric-filled waveguide 23 and dielectric-filled waveguide 24 transmission equate; Transmission also is same situation in the electromagnetic wave dielectric-filled waveguide 17 on the right, like this at the equal port of four width of bore face of antenna, electromagnetic amplitude is all consistent, and then reach the aperture efficiency that improves antenna and the purpose of gain, and since dielectric-filled waveguide 23,24,25 and 26 port width a all satisfy condition
Be that port width a equals free space wavelength λ except subtracting 1 subduplicate twice in medium relative dielectric constant ε, so the wave impedance of electromagnetic wave in dielectric-filled waveguide equal the wave impedance of free space, the reflection of antenna opening diametric plane is just little like this.
On technique, the plane horn antenna of amplitude impedance calibration both can adopt common printed circuit board (PCB) (PCB) technique, also can adopt the integrated circuit technologies such as LTCC (LTCC) technique or CMOS, Si substrate to realize.The via hole 3,11 that wherein metallizes can be that the hollow metal through hole also can be the solid metal hole, also can be continuous metallization wall, and the shape of metal throuth hole can be circular, also can be square or other shapes.
Structurally, equate condition owing to will satisfy wave impedance, the port width of dielectric-filled waveguide is certain, thereby the width of antenna opening diametric plane 20 just can not Set arbitrarily, because keep dielectric-filled waveguide to equal the wave impedance of free space in the wave impedance of port, the dielectric constant of medium substrate 4 is certain, and then the port width of dielectric-filled waveguide is also certain, therefore the dielectric-filled waveguide quantity at antenna opening diametric plane place doubles, and bore face 20 width of antenna also will double.According to same thinking, can add again four strip metal arrays of vias four dielectric-filled waveguides are divided into eight dielectric-filled waveguides, and so that arrive the wave impedance that the same and port wave impedance of electromagnetic wave power on antenna opening diametric planes 20 all equals free space by these eight dielectric-filled waveguides, so not only the reflection of antenna is little, amplitude distribution on the bore face 20 is more even simultaneously, but the overall width of antenna opening diametric plane 20 will double.Because the metallization via sidewall 11 the closer to antenna, the distance that electromagnetic wave arrives antenna opening diametric plane 20 is far away, therefore with respect to from the dielectric-filled waveguide of metallization via sidewall 11 away from, from the width relative narrower of the dielectric-filled waveguide of metallization via sidewall 11 close to obtain higher electromagnetic transmission phase velocity.Polygon in the metallization arrays of vias 21 and 22 can be triangle, quadrangle, pentagon or other polygon, and the shape on these polygonal limits or many limits can be straight line, camber line or other curve; Head end straightway in the metallization arrays of vias 21 and 22 and the shape of tail end straightway can be straight line, broken line, exponential line or other curve etc.
According to the above, just can realize the present invention.
Claims (10)
1. the plane horn antenna of an amplitude impedance calibration is characterized in that this antenna comprises microstrip feed line (1), substrate integration wave-guide horn antenna (2) and the embedded metal via hole (3) that is arranged on the medium substrate (4); One end of described microstrip feed line (1) is the input/output port (5) of antenna, and the narrow port (6) of the other end of microstrip feed line (1) and substrate integration wave-guide horn antenna (2) joins; Substrate integration wave-guide horn antenna (2) by the first metal flat (8) that is positioned at medium substrate (4) one side, be positioned at second metal flat (10) of medium substrate (4) another side and be connected medium substrate (4) and connect two of the first metal flat (8) and the second metal flat (10) and arrange the via hole loudspeaker sidewalls (11) that metallize and form; Metallization via hole (3) embedded in the substrate integration wave-guide horn antenna (2) connects the first metal flat (8) and the second metal flat (10), and consists of metallization arrays of vias (14); Intermediate metallization arrays of vias (15), left side metallization arrays of vias (21) and the right metallization arrays of vias (22) form first medium and fill waveguide (23), second medium filling waveguide (24), the 3rd dielectric-filled waveguide (25) and the 4th dielectric-filled waveguide (26) in horn antenna (2).
2. the plane horn antenna of a kind of amplitude impedance calibration according to claim 1, it is characterized in that in the described metallization arrays of vias (14), intermediate metallization arrays of vias (15) is positioned at the middle position of two sidewalls (11) of substrate integration wave-guide horn antenna (2), and substrate integration wave-guide horn antenna (2) is divided into symmetrical two parts, in the both sides of the metallization arrays of vias (15) of centre, symmetrical have left side dielectric-filled waveguide (16) and a right dielectric-filled waveguide (17).
3. the plane horn antenna of a kind of amplitude impedance calibration according to claim 1 and 2, it is characterized in that described intermediate metallization arrays of vias (15) shape is one section straight line, the head end (18) of intermediate metallization arrays of vias (15) is near the narrow port (6) of substrate integration wave-guide horn antenna (2), and the tail end (19) of intermediate metallization arrays of vias (15) is in antenna opening diametric plane (20).
4. the plane horn antenna of a kind of amplitude impedance calibration according to claim 1 and 2, it is characterized in that in the described metallization arrays of vias (14), left side metallization arrays of vias (21) is divided into first medium to left side dielectric-filled waveguide (16) and fills waveguide (23) and second medium filling waveguide (24), and the right metallization arrays of vias (22) is divided into the 3rd dielectric-filled waveguide (25) and the 4th dielectric-filled waveguide (26) to the dielectric-filled waveguide on the right (17); First medium is filled a end that waveguide (23), second medium fill waveguide (24), the 3rd dielectric-filled waveguide (25) and the 4th dielectric-filled waveguide (26) all towards the direction of the narrow port of antenna (6), its other end is all on antenna opening diametric plane (20), and four dielectric-filled waveguides (23), (24), (25) are the same at the width of antenna opening diametric plane (20) upper port with (26).
5. the plane horn antenna of a kind of amplitude impedance calibration according to claim 4 is characterized in that described left side metallization arrays of vias (21) all is to be linked to each other with three sections of tail end straightways by head end straightway, polygon to consist of with the right metallization arrays of vias (22) shape; Head end straightway in left side metallization arrays of vias (21) and the right metallization arrays of vias (22) or the shape of tail end straightway can be straight line, broken line or exponential line etc., and its length can be zero or finite length; Polygon in left side metallization arrays of vias (21) and the right metallization arrays of vias (22) can be triangle, quadrangle, pentagon or other polygon, and the shape on a polygonal limit or many limits can be straight line, camber line or other curve.The head end of left side metallization arrays of vias (21) and the right metallization arrays of vias (22) is the direction of the narrow port (6) of close horn antenna all, and the tail end of left side metallization arrays of vias (21) and the right metallization arrays of vias (22) is on antenna opening diametric plane (20).
6. the plane horn antenna of a kind of amplitude impedance calibration according to claim 1 and 2 is characterized in that described left side dielectric-filled waveguide (16), the right dielectric-filled waveguide (17), first medium is filled waveguide (23), second medium is filled waveguide (24), the width of the 3rd dielectric-filled waveguide (25) and the 4th dielectric-filled waveguide (26) will guarantee that all its main mould can on the left side dielectric-filled waveguide (16), the right dielectric-filled waveguide (17), first medium is filled waveguide (23), second medium is filled waveguide (24), transmission and not being cut off in the 3rd dielectric-filled waveguide (25) and the 4th dielectric-filled waveguide (26).
7. a kind of plane horn antenna of amplitude impedance calibration according to claim 1 or 5, it is characterized in that selecting the position in head end straightway in the left side metallization arrays of vias (21) or the polygon on the left side dielectric-filled waveguide (16), to fill the electromagnetic power that transmits in the waveguide (24) equal so that fill waveguide (23) and second medium at first medium.
8. a kind of plane horn antenna of amplitude impedance calibration according to claim 1 or 5, it is characterized in that selecting the on the right position in the dielectric-filled waveguide (17) of head end straightway in the right metallization arrays of vias (22) or polygon, so that the electromagnetic power that transmits is equal in the 3rd dielectric-filled waveguide (25) and the 4th dielectric-filled waveguide (26).
9. the plane horn antenna of a kind of amplitude impedance calibration according to claim 1, it is characterized in that described two row metallization via hole loudspeaker sidewalls (11), flare up is tubaeform and then connect one section wide parallel-segment (13) and consist of gradually to connect one section by one section narrow parallel-segment (12).
10. the plane horn antenna of a kind of amplitude impedance calibration according to claim 1 is characterized in that described first medium is filled waveguide (23), second medium is filled waveguide (24), the 3rd dielectric-filled waveguide (25) and the 4th dielectric-filled waveguide (26) all equal free space in the wave impedance of the port of antenna opening diametric plane (20) wave impedance.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210564047.1A CN103022714B (en) | 2012-12-21 | 2012-12-21 | Amplitude impedance calibrated planar horn antenna |
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| CN201210564047.1A CN103022714B (en) | 2012-12-21 | 2012-12-21 | Amplitude impedance calibrated planar horn antenna |
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| CN103022714B CN103022714B (en) | 2015-02-18 |
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| CN103594804A (en) * | 2013-11-29 | 2014-02-19 | 东南大学 | Thin-substrate slot-line planar horn antenna |
| CN103594808A (en) * | 2013-11-29 | 2014-02-19 | 东南大学 | Thin-substrate slot-line difference-beam planar horn antenna |
| CN103606746A (en) * | 2013-11-29 | 2014-02-26 | 东南大学 | Thin-substrate broadband planar horn antenna |
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| CN103022714B (en) | 2015-02-18 |
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