CN102800944B - A kind of asymmetrical antenna and there is the MIMO antenna of this asymmetrical antenna - Google Patents
A kind of asymmetrical antenna and there is the MIMO antenna of this asymmetrical antenna Download PDFInfo
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- CN102800944B CN102800944B CN201110145196.XA CN201110145196A CN102800944B CN 102800944 B CN102800944 B CN 102800944B CN 201110145196 A CN201110145196 A CN 201110145196A CN 102800944 B CN102800944 B CN 102800944B
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- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
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Abstract
The present invention discloses a kind of asymmetrical antenna, and it comprises feeder line, sheet metal, and described feeder line is by sheet metal described in coupled modes feed-in; On described sheet metal, at least engrave asymmetrical the first micro groove structure and the second micro groove structure, made described antenna there are at least two different resonance band. According to asymmetrical antenna of the present invention, on sheet metal, at least engrave asymmetric the first micro groove structure and the second micro groove structure, therefore can produce easily multiple resonance points, and the difficult counteracting of resonance point, be easy to realize multimode resonance. Meanwhile, the present invention also discloses a kind of MIMO antenna that comprises above-mentioned asymmetrical antenna, and this MIMO antenna has high-isolation.
Description
Technical Field
The present invention relates to the field of wireless communication, and more particularly, to an asymmetric antenna and a MIMO antenna having the same.
Background
When the conventional antenna design encounters the problems of small antenna usage space, low operating frequency, multi-mode operation and the like, the performance of the antenna is greatly limited by the size of the antenna volume. The reduction in antenna volume will also affect the electrical length of the antenna, and the antenna radiation efficiency and operating frequency will change. The traditional dipole antenna and the PIFA antenna are not free from the problems of small volume, wide frequency band and the like of the traditional communication terminal, and the design difficulty is very high, so that the use requirement cannot be met finally. In the low-frequency band design of the traditional antenna, the multi-mode radiation requirement is realized only by an external matching line, and the low-frequency and multi-mode working requirement can be realized functionally after a matching network is added into an antenna feed system, but the radiation efficiency of the traditional antenna is greatly reduced because a part of energy is greatly lost on the matching network. The existing metamaterial small antenna, as disclosed in chinese patent No. CN201490337, integrates a novel artificial electromagnetic material in the design, so that the radiation thereof has a very rich dispersion characteristic, and can form a plurality of radiation modes, i.e., a complex impedance matching network can be omitted, and the rich dispersion characteristic brings great convenience to impedance matching of multiple frequency points. However, when the existing metamaterial small antenna faces the problems of small volume, low working frequency, broadband multi-mode and the like of the existing terminal equipment, the design process is also greatly restricted.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide an asymmetric antenna and a MIMO antenna having the same, which are easy to implement multi-mode and still have good performance at low operating frequency, in view of the above-mentioned shortcomings of the prior art.
The technical scheme adopted by the invention for solving the technical problem is to provide an asymmetric antenna, which comprises a feeder line and a metal sheet, wherein the feeder line is fed into the metal sheet in a coupling mode, and at least an asymmetric first micro-groove structure and an asymmetric second micro-groove structure are engraved on the metal sheet, so that the antenna has at least two different resonant frequency bands.
Further, the first micro-groove structure is one of a complementary open resonator ring structure, a complementary helical line structure, an open helical ring structure, a double-open helical ring structure and a complementary meander line structure, or a micro-groove structure derived, compounded or arrayed by the above structures.
Further, the second micro-groove structure is one of a complementary open resonator ring structure, a complementary helical line structure, an open helical ring structure, a double-open helical ring structure and a complementary meander line structure, or a micro-groove structure derived, compounded or arrayed by the above structures.
Further, the antenna also comprises a medium for placing the feeder line and the metal sheet.
Further, the medium is air, ceramic, an epoxy resin substrate or a polytetrafluoroethylene substrate.
Further, the first micro-groove structure and the second micro-groove structure are hollowed out on the metal sheet through etching, drilling and etching, photoetching, electronic etching or ion etching.
Further, the feeder line is not in contact with the metal sheet and is fed into the metal sheet in a capacitive coupling mode.
Further, the feeder line is connected with the metal sheet through a short-circuit point, so that the feeder line is fed into the metal sheet in an inductive coupling mode.
The present invention also provides a MIMO antenna comprising a plurality of asymmetric antennas as claimed in claim 1.
Furthermore, each feeder of the plurality of asymmetric antennas is connected with a receiver/transmitter, and all the receivers/transmitters are connected with the baseband signal processor.
According to the asymmetric antenna, the metal sheet is at least engraved with the asymmetric first micro-groove structure and the asymmetric second micro-groove structure, so that a plurality of resonance points can be easily generated, the resonance points are not easy to offset, and multi-mode resonance is easily realized. The invention also discloses a MIMO antenna comprising the asymmetric antenna, and the MIMO antenna has high isolation.
Drawings
FIG. 1 is a schematic diagram of an asymmetric antenna structure according to the present invention;
FIG. 2 is a front view of a first preferred embodiment of the asymmetric antenna of the present invention;
FIG. 3 is a front view of a second preferred embodiment of the asymmetric antenna of the present invention;
fig. 4 is a front view of a third preferred embodiment of the asymmetric antenna of the present invention.
FIG. 5a is a schematic diagram of a complementary split-ring resonator structure;
FIG. 5b is a schematic view of a complementary helical structure;
FIG. 5c is a schematic view of an open helical ring structure;
FIG. 5d is a schematic view of a double-opening helical ring structure;
FIG. 5e is a schematic view of a complementary meander line structure;
FIG. 6a is a schematic diagram of a geometric derivative of the complementary split-ring resonator structure shown in FIG. 5 a;
FIG. 6b is an expanded derivative of the complementary split-ring structure shown in FIG. 5 a;
FIG. 7a is a schematic diagram of a composite structure of three complementary split-ring resonators shown in FIG. 5 a;
FIG. 7b is a composite schematic diagram of two complementary split-ring structures of FIG. 5a and a complementary helical structure of FIG. 5 b;
fig. 8 is a schematic structural diagram of four complementary open-ended resonant ring structure arrays shown in fig. 5 a.
Detailed Description
As shown in fig. 1, fig. 1 is a schematic diagram of an asymmetric antenna structure according to the present invention. In fig. 1, the asymmetric antenna of the present invention includes a feed line 1 and a metal plate 2. At least a first micro-groove structure 100 and a second micro-groove structure 200 are engraved on the metal sheet 2, so that the asymmetric antenna has at least two different resonant frequencies. The asymmetry here means that the first micro-groove structure 100 and the second micro-groove structure 200 have different patterns, sizes and/or spatial positions, which cause the resonant frequency bands of the first micro-groove structure 100 and the second micro-groove structure 200 to be different.
The feed line 1 is disposed partially around the metal plate 2 to couple-feed the metal plate 2. The mode of the feeder 1 for the metal sheet 2 to feed in a coupling mode can be an inductive coupling feeding mode formed by arranging a short-circuit point to connect the feeder 1 and the metal sheet 2, and also a capacitive coupling feeding mode formed by capacitively coupling the opposite parts of the feeder 1 and the metal sheet 2 without connecting the feeder and the metal sheet.
The first micro-groove structure 100 and the second micro-groove structure 200 of the present invention may be one of the complementary open resonator ring structure shown in fig. 5a, the complementary helical structure shown in fig. 5b, the open helical ring structure shown in fig. 5c, the double-open helical ring structure shown in fig. 5d, and the complementary meander line structure shown in fig. 5e, or a micro-groove structure derived, compounded, or arrayed by the foregoing structures. The derivation is divided into two types, one is geometric derivation, the other is extended derivation, the geometric derivation here refers to derivation of structures with similar functions and different shapes, for example, derivation from a square-frame-type structure to a curve-type structure, a triangle-type structure and other different polygon-type structures; the extension derivation here is to open a new groove on the basis of fig. 5a to 5e to form a new micro-groove structure; taking the complementary split-ring structure shown in fig. 5a as an example, fig. 6a is a schematic diagram derived from the geometry thereof, and fig. 6b is a schematic diagram derived from the geometry thereof. The compounding here means that a plurality of the micro-groove structures of fig. 5a to 5e are overlapped to form a new micro-groove structure, as shown in fig. 7a, which is a schematic structural diagram of three complementary open-ended resonant ring structures shown in fig. 5a after compounding; fig. 7b is a schematic diagram of a structure obtained by combining two complementary open-ended resonant ring structures shown in fig. 5a and a complementary helical structure shown in fig. 5 b. The array here refers to a structure in which a plurality of micro-slot structures shown in fig. 5a to 5e are arrayed on the same metal sheet to form an integral micro-slot structure, as shown in fig. 8, which is a schematic structural diagram of a plurality of complementary open-ended resonant ring structures shown in fig. 5 a. However, the first micro-groove structure 100 and the second micro-groove structure 200 of the present invention are asymmetric, and a specific asymmetric manner is described in detail in the following embodiments.
The method for forming the first micro-groove structure 100 and the second micro-groove structure 200 on the metal sheet 2 may be etching, drilling, photoetching, electronic etching, ion etching, etc., wherein the etching is a preferred process, and the main steps are that after a suitable micro-groove structure is designed, a foil part of a preset micro-groove structure is removed by using a chemical reaction of a solvent and metal through etching equipment, and the metal sheet 2 formed with the first micro-groove structure 100 and the second micro-groove structure 200 is obtained. The metal foil may be made of a metal such as copper or silver.
The invention also comprises a medium for placing the feeder line and the metal sheet, wherein the medium can be air, ceramic, an epoxy resin substrate or a polytetrafluoroethylene substrate.
If the first micro-groove structure and the second micro-groove structure which are symmetrical are adopted on the metal sheet 2, namely the resonant frequencies of the first micro-groove structure and the second micro-groove structure are the same, the Q value of the antenna is increased after the first micro-groove structure and the second micro-groove structure are coupled with each other, and the corresponding bandwidth BW is reduced, which is not beneficial to realizing multi-mode resonance. If at least asymmetrical first micro-groove structure and second micro-groove structure are adopted, capacitance values and inductance values generated by the two structures responding to electromagnetic waves are different, so that a plurality of different resonance points are generated, the plurality of different resonance points are not easy to offset, and rich multi-mode of the antenna is realized.
The first micro-groove structure 100 and the second micro-groove structure 200 of the present invention may have the same or different structural forms. And the degree of asymmetry between the first micro-groove structure 100 and the second micro-groove structure 200 can be adjusted as desired. Thereby achieving a rich tunable multimode resonance. And according to the needs, the invention can also set up more than two microgroove structures on the same metal sheet so that the antenna has more than three different resonance frequency bands.
Three asymmetric micro-groove structures formed on the metal sheet 2 of the present invention are discussed in detail below.
As shown in fig. 2, fig. 2 is a front view of a first preferred embodiment of the present invention, and in fig. 2, the first micro-groove structure 100 and the second micro-groove structure 200 are asymmetric structures, wherein the first micro-groove structure 100 and the second micro-groove structure 200 are connected together, and due to the asymmetry of the structures caused by the difference of the patterns, the resonance frequencies of the respective areas of the first micro-groove structure 100 and the second micro-groove structure 200 are different. In this embodiment, the complementary helical structure and the derivative structure of the complementary helical structure shown in fig. 5b are taken as an example and connected to each other.
As shown in fig. 3, fig. 3 is a front view of a second preferred embodiment of the present invention, and in fig. 3, the first micro-groove structure 100 and the second micro-groove structure 200 are asymmetric structures with different patterns, wherein the first micro-groove structure 100 and the second micro-groove structure 200 are independent from each other, and due to the asymmetry of the structures caused by the different patterns, the resonant frequencies of the respective areas of the first micro-groove structure 100 and the second micro-groove structure 200 are different. In this embodiment, the first micro-groove structure 100 is illustrated by an open spiral ring structure shown in fig. 5c, and the second micro-groove structure 200 is illustrated by a complementary spiral structure shown in fig. 5 b.
As shown in fig. 4, which is a front view of a third preferred embodiment of the present invention, in fig. 4, the first micro-groove structure 100 and the second micro-groove structure 200 are asymmetric structures, wherein the first micro-groove structure 100 and the second micro-groove structure 200 are independent from each other, and have the same pattern, but the different sizes thereof cause asymmetry of the structures, so that the resonant frequencies of the respective areas of the first micro-groove structure 100 and the second micro-groove structure 200 are different. In this embodiment, the first micro-groove structure 100 and the second micro-groove structure 200 are both illustrated by the complementary helical structure shown in fig. 5 c.
The present invention also provides a multiple-input multiple-output (MIMO) antenna including a plurality of the above-described asymmetric antennas. Each feeder of each asymmetric antenna in the MIMO antenna is respectively connected with a transmitting/receiving machine, and all the transmitting/receiving machines are connected with a baseband signal processor.
While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (8)
1. An asymmetric antenna, comprising a feeder line and a metal sheet, wherein the feeder line is fed into the metal sheet by coupling, the asymmetric antenna is characterized in that: the metal sheet is at least engraved with an asymmetric first micro-groove structure and an asymmetric second micro-groove structure, so that the antenna has at least two different resonance frequency bands, wherein the first micro-groove structure and the second micro-groove structure are independent from each other, the patterns of the first micro-groove structure and the second micro-groove structure are the same, but the sizes of the first micro-groove structure and the second micro-groove structure are different;
wherein,
the feeder line is connected with the metal sheet through a short-circuit point, so that the feeder line is fed into the metal sheet in an inductive coupling mode.
2. The asymmetric antenna of claim 1, wherein: the first micro-groove structure is one of a complementary open resonant ring structure, a complementary spiral line structure, an open spiral ring structure, a double-open spiral ring structure and a complementary bent line structure or a micro-groove structure obtained by derivation, compounding or arraying of the previous structures.
3. The asymmetric antenna of claim 1, wherein: the second micro-groove structure is one of a complementary open resonant ring structure, a complementary spiral line structure, an open spiral ring structure, a double-open spiral ring structure and a complementary bent line structure or a micro-groove structure obtained by derivation, compounding or arraying of the previous structures.
4. The asymmetric antenna of claim 1, wherein: the antenna also comprises a medium for placing the feeder and the metal sheet.
5. The asymmetric antenna of claim 4, wherein: the medium is air, ceramic, an epoxy resin substrate or a polytetrafluoroethylene substrate.
6. An asymmetric antenna as claimed in claim 1, 2 or 3, wherein: the first micro-groove structure and the second micro-groove structure are hollowed out on the metal sheet through etching, drilling and etching, photoetching, electronic etching or ion etching.
7. A MIMO antenna, characterized by: comprising a plurality of asymmetric antennas according to claim 1.
8. The MIMO antenna of claim 7, wherein: each feeder of the plurality of asymmetric antennas is connected with a receiver/transmitter, and all the receivers/transmitters are connected with a baseband signal processor.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110145196.XA CN102800944B (en) | 2011-05-31 | 2011-05-31 | A kind of asymmetrical antenna and there is the MIMO antenna of this asymmetrical antenna |
| TW100135539A TWI501468B (en) | 2011-03-14 | 2011-09-30 | Asymmetric antenna and a mimo antenna |
| PCT/CN2011/080436 WO2012122793A1 (en) | 2011-03-14 | 2011-09-30 | Asymmetric antenna and mimo antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110145196.XA CN102800944B (en) | 2011-05-31 | 2011-05-31 | A kind of asymmetrical antenna and there is the MIMO antenna of this asymmetrical antenna |
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| Publication Number | Publication Date |
|---|---|
| CN102800944A CN102800944A (en) | 2012-11-28 |
| CN102800944B true CN102800944B (en) | 2016-05-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201110145196.XA Active CN102800944B (en) | 2011-03-14 | 2011-05-31 | A kind of asymmetrical antenna and there is the MIMO antenna of this asymmetrical antenna |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1304765A2 (en) * | 2001-10-22 | 2003-04-23 | Filtronic LK Oy | Internal multiband antenna |
| CN101740862A (en) * | 2008-11-20 | 2010-06-16 | 东莞市启汉电子科技有限公司 | Dipole antenna of RF chip |
| CN101958460A (en) * | 2009-07-17 | 2011-01-26 | 捷讯研究有限公司 | Multiple-grooved antenna and mobile device |
| CN202127090U (en) * | 2011-05-31 | 2012-01-25 | 深圳光启高等理工研究院 | Asymmetrical antenna and MIMO (multiple-input multiple-output) antenna with same |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100689475B1 (en) * | 2005-04-27 | 2007-03-02 | 삼성전자주식회사 | Built-in type antenna apparatus for mobile phone |
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- 2011-05-31 CN CN201110145196.XA patent/CN102800944B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1304765A2 (en) * | 2001-10-22 | 2003-04-23 | Filtronic LK Oy | Internal multiband antenna |
| CN101740862A (en) * | 2008-11-20 | 2010-06-16 | 东莞市启汉电子科技有限公司 | Dipole antenna of RF chip |
| CN101958460A (en) * | 2009-07-17 | 2011-01-26 | 捷讯研究有限公司 | Multiple-grooved antenna and mobile device |
| CN202127090U (en) * | 2011-05-31 | 2012-01-25 | 深圳光启高等理工研究院 | Asymmetrical antenna and MIMO (multiple-input multiple-output) antenna with same |
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| CN102800944A (en) | 2012-11-28 |
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