CN201898204U - Multi-antenna structure for realizing high isolation of broadband - Google Patents
Multi-antenna structure for realizing high isolation of broadband Download PDFInfo
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- CN201898204U CN201898204U CN2010206465565U CN201020646556U CN201898204U CN 201898204 U CN201898204 U CN 201898204U CN 2010206465565 U CN2010206465565 U CN 2010206465565U CN 201020646556 U CN201020646556 U CN 201020646556U CN 201898204 U CN201898204 U CN 201898204U
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Abstract
The utility model discloses a multi-antenna structure for realizing high isolation of a broadband, which comprises a coplanar waveguide, a dielectric plate and a plurality of antennas, wherein the antennas and the coplanar waveguide stay on the same surface of the dielectric plate, and the coplanar waveguide is connected with the antennas; and each antennas is a broadband antenna, and each antenna is bent to be in a rectangular ring shape/a circular ring shape/an ellipsoid ring shape. Each antenna is provided with a notch, the direction of the notch of each antenna is consistent with each other, and a capacitance element can be used for being connected with two ends of each notch. The coplanar waveguide comprises a central guide body, a single-function grounding plate and a sharing grounding plate; the sharing grounding plate is arranged between the two central guide bodies, i.e. one side of the central guide body is close to the sharing grounding plate; and the side of the central guide body which is not close to the sharing grounding plate is close to the single-function grounding plate. Compared with the prior art, the high isolation of the antennas can be realized within a wider frequency band, and at the same time, the favorable radiation performance of each antenna can be maintained.
Description
Technical field
The utility model relates to a kind of multi-antenna structure, particularly a kind of multi-antenna structure of realizing the broadband high-isolation.
Background technology
In multiaerial system, need to use a plurality of receptions and transmitting antenna, the coupling between the antenna can reduce the radiance of antenna, and therefore influences the performance of whole system.Especially in handheld device (as mobile phone), the gap between the antenna is very little, and it is very strong to be coupled, if the isolation technology that can not adopt is eliminated the coupling between antenna, equipment is cisco unity malfunction,
At present, the height isolation that realizes placing between the very near antenna has been subjected to the attention of a lot of companies and research institution, and has proposed several main methods in succession:
Employing is at the ground plate fluting or add defect ground structure.Utilize groove or defective ground (DGS) on the ground plate can produce the band inhibition effect, thus the coupling between the suppressing antenna.But this method also faces very big problem: because ground plate needs to be connected with a lot of electric components, the mobile phone engineer does not generally allow to change the structure of ground plate.Therefore implement and be not easy.
Adopt electromagnetic bandgap structure (EBG).EBG can suppress surface wave propagation, therefore can reduce the coupling between antenna.But also there is very big shortcoming this aspect: the EBG structure is too big, is not suitable for mobile device.
Adopt port decoupling and matching process.A passive decoupling device (directional coupler or branch line coupler) and matching network are added to the port of antenna.But the shortcoming of this method is: increased the complexity of design, passive device will occupy very big space, and matching network can be introduced loss.
At the said method complex structure, realize being not easy, problem such as structure is too big comes from Jiang Zhu
, Student Member, IEEE, and George V. Eleftheriades
, Fellow, IEEE,IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS, VOL. 9,2010 document A Simple Approach for Reducing Mutual Coupling in Two Closely Spaced Metamaterial-Inspired Monopole Antennas has proposed a kind of new method--coplanar wave guide feedback method.As shown in Figure 1, this structure comprises: dielectric plate 1, antenna 2 and 4, electric capacity 3, co-planar waveguide center conductor 5,6, and ground plate 7 utilizes the characteristic of coplanar waveguide structure, and coupling that co-planar waveguide ground is introduced and the coupling between the antenna offset.This method is well suited in the system and circuit board of coplanar wave guide feedback, and is simple in structure without any need for extention, and miniaturization is easy to realize, and can be used for mobile device.But this method also has individual problem, and the antenna that is exactly wherein to be adopted is super material antenna, the smaller bandwidth of this antenna.
At present, wireless communication standard is a lot, and shared frequency range is also inequality.A lot of frequency ranges are very close, as existing C DMA800, GSM900.And the U.S. also gives LTE with the frequency allocation of 700MHz.In mobile device, in order to save the space, an antenna need cover a plurality of frequency ranges.For the frequency range of closing on, many times be to adopt an antenna to cover.Just need realize high-isolation this moment in the bandwidth than broad.And original coplanar wave guide feedback method can only cover narrow frequency range, and is keeping needing improvement aspect the good radiance of antenna.
The utility model content
The purpose of this utility model is exactly to provide a kind of height of antenna of can realizing in than the frequency range of broad to isolate for the defective that overcomes above-mentioned prior art existence, keeps the multi-antenna structure of the good radiance of antenna simultaneously.
The utility model discloses a kind of multi-antenna structure of realizing the broadband high-isolation, comprise: co-planar waveguide, dielectric plate, some antennas, it is characterized in that: described some antennas and described co-planar waveguide are positioned at the same surface of described dielectric plate, and described co-planar waveguide links to each other with described some antennas; Described some antennas are broad-band antenna, and described some antennas are the rectangular ring/circular ring-type/elliptical annular that is bent into.
Described some antennas are two monopole antennas.
Described some antennas leave a breach, and the breach direction unanimity of each antenna, and described breach also can connect its two ends with the capacitive character components and parts.
Described co-planar waveguide comprises center conductor, single with ground plate, shared grounding plate; Described shared grounding plate is between two center conductors, and promptly center conductor has a side near the shared grounding plate; The close ground plate of singly using of the non-side of aforementioned center conductor near the shared grounding plate.
Described center conductor one end links to each other with described antenna; The described center conductor other end has a feedback point.
With respect to prior art, the utlity model has following advantage:
The first, the utility model adopts the antenna structure of bending, utilizes the principle of coplane guided wave, has realized that the coupling between the antenna is offset, thereby has realized the height isolation between the antenna;
The second, effective working frequency range of antenna of the present utility model is positioned at 746-960MHz, and it can be worked in the frequency range than broad.
The 3rd, the utility model keeps the good radiance of antenna simultaneously.
Description of drawings
Fig. 1 is the structural representation of original coplanar wave guide feedback method;
Fig. 2 is the return loss and the isolation analogous diagram of the antenna of original coplanar wave guide feedback method;
Fig. 3 is the structural representation of embodiment 1 of the present utility model;
Fig. 4 is the return loss and the isolation analogous diagram of the antenna of embodiment 1 of the present utility model.
Embodiment
The utility model improves the structure in original coplanar wave guide feedback method, and antenna is done into a bent shape.As for the shape of the bending of antenna, and the type of antenna and quantity, being determined on a case-by-case basis, the utility model is not made qualification to this.
Close with specific embodiment below in conjunction with accompanying drawing the utility model be described further:
Embodiment 1
Present embodiment proposes a kind of two monopole antenna structures of coplanar wave guide feedback, antenna adopts two monopole antennas, and the number of antenna is two, and antenna is bent into rectangular ring, and each rectangular ring antenna leaves a breach, and the breach direction unanimity of each antenna.As for the type of antenna, also can adopt other broad-band antenna, use Bisingle polar antenna here, only, this is not made qualification for for example.As for the shape of antenna, also can be circular ring-type or elliptical annular, use rectangular ring here, only, this is not made qualification for for example.As for the breach of antenna, it can also be to connect its two ends with the capacitive character components and parts, and the breach situation of correspondence in the present embodiment only for for example, is not made qualification to this.
This structure as shown in Figure 3, a kind of multi-antenna structure of realizing the broadband high-isolation, comprise: first co-planar waveguide comprises the 1st center conductor 401, the 1st is single with ground plate 301, shared grounding plate 303, second co-planar waveguide comprises the 2nd center conductor 402, the 2nd is single with ground plate 302, shared grounding plate 303, dielectric plate 601, the 1st antenna 101, the 2nd antenna 201, described the 1st antenna 101, the 2nd antenna 201 and described first and second co-planar waveguides are positioned at the same surface of described dielectric plate 601, the 1st antenna 101, the 2nd antenna 201 is bent into rectangular ring, and each rectangular ring leaves a breach, and the breach direction unanimity of two antennas.Described shared grounding plate 303 is between the 1st center conductor the 401, the 2nd center conductor 402, and promptly the 1st center conductor the 401, the 2nd center conductor respectively has a side near shared grounding plate 303.A non-side near shared grounding plate 303 of the 1st center conductor 401 is single with ground plate 301 near the 1st; A non-side near shared grounding plate 303 of the 2nd center conductor 402 is single with ground plate 302 near the 2nd.And an end of first center conductor 401 links to each other with the 1st antenna 101, and its other end has the 1st feedback point 501; One end of second center conductor 402 links to each other with the 2nd antenna 201, and its other end has the 2nd feedback point 502.
Suppose 101 work of the 1st antenna, first co-planar waveguide produces the feed-in current i
1Consider that according to actual conditions the distance of the 1st antenna the 101, the 2nd antenna 201 is very near, so will produce very strong couple current i on the 2nd antenna 201
2, since the bending structure of antenna, the couple current i on the 2nd antenna 201
2With the feed-in current i on the 1st antenna 101
1In the same way.Simultaneously, because the feed-in current i on shared shared grounding plate 303, the 1 antennas 101 of the 1st antenna 101 and the 2nd antenna 201
1Also can with the 2nd center conductor 402 that the 2nd antenna 201 links to each other on produce couple current i
3Since the characteristic of co-planar waveguide, i
3With i
1Oppositely.Therefore, i
3With i
2Also reverse.Therefore, two kinds of couplings are cancelled out each other, and produce high the isolation.If top principle is also followed in 201 work of the 2nd antenna, produce high the isolation.
Because the bandwidth of monopole antenna is very wide, so the bandwidth of operation and the also non-constant width of isolation bandwidth of the antenna of our design.In order to verify the validity of the antenna that we are designed, we at first carry out emulation to the 1st antenna the 101, the 2nd antenna 201, simulation result as shown in Figure 4, wherein, S11 refers to the return loss of the 1st antenna 101; S22 refers to the return loss of the 2nd antenna 201, and S21 refers to the isolation between the 1st antenna 101 and the 2nd antenna 201, as can be seen from the figure, effective working frequency range of two antennas is positioned at 746-960MHz, in this frequency range, to isolate all less than-14dB, bandwidth has reached 25%.In this section frequency range, because the radiation characteristic of monopole antenna is fine, so radiation efficiency is also than higher.And the structure in original coplanar wave guide feedback method of mentioning in the background is because what adopt is super material antenna, and radiation efficiency is not so good as the monopole antenna that we adopted, so effective bandwidth only is 10%, referring to Fig. 2.
Embodiment 2:
Present embodiment is basic identical with embodiment 1, unique different be that antenna adopts dipole antenna or loop antenna.
The utility model preferred embodiment just is used for helping to set forth the utility model.Preferred embodiment does not have all details of detailed descriptionthe, does not limit this utility model yet and only is described embodiment.Obviously, according to the content of this specification, can make many modifications and variations.These embodiment are chosen and specifically described to this specification, is in order to explain principle of the present utility model and practical application better, thereby the technical field technical staff can utilize the utility model well under making.The utility model only is subjected to the limit of claims and four corner and equivalent.
Claims (5)
1. multi-antenna structure of realizing the broadband high-isolation, comprise: co-planar waveguide, dielectric plate, some antennas, it is characterized in that: described some antennas and described co-planar waveguide are positioned at the same surface of described dielectric plate, and described co-planar waveguide links to each other with described some antennas; Described some antennas are broad-band antenna, and described some antennas are the rectangular ring/circular ring-type/elliptical annular that is bent into.
2. a kind of multi-antenna structure of realizing the broadband high-isolation according to claim 1 is characterized in that: described some antennas are two monopole antennas.
3. a kind of multi-antenna structure of realizing the broadband high-isolation according to claim 1 is characterized in that: described some antennas leave a breach, and the breach direction unanimity of each antenna, and described breach also can connect its two ends with the capacitive character components and parts.
4. a kind of multi-antenna structure of realizing the broadband high-isolation according to claim 1 is characterized in that: described co-planar waveguide comprises center conductor, single with ground plate, shared grounding plate; Described shared grounding plate is between two center conductors, and promptly center conductor has a side near the shared grounding plate; The close ground plate of singly using of the non-side of aforementioned center conductor near the shared grounding plate.
5. a kind of multi-antenna structure of realizing the broadband high-isolation according to claim 1 is characterized in that: described center conductor one end links to each other with described antenna; The described center conductor other end has a feedback point.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010206465565U CN201898204U (en) | 2010-12-08 | 2010-12-08 | Multi-antenna structure for realizing high isolation of broadband |
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| CN2010206465565U CN201898204U (en) | 2010-12-08 | 2010-12-08 | Multi-antenna structure for realizing high isolation of broadband |
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| CN201898204U true CN201898204U (en) | 2011-07-13 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102916254A (en) * | 2012-10-30 | 2013-02-06 | 南京信息工程大学 | Miniaturized high-isolation wireless local area network antenna |
| CN110581347A (en) * | 2019-08-29 | 2019-12-17 | 电子科技大学 | A dual-loop antenna applied to 4G-MIMO smart glasses |
| CN116315739A (en) * | 2023-01-06 | 2023-06-23 | 西南大学 | Planar antenna unit and its array applied to 5G millimeter wave dual-band |
-
2010
- 2010-12-08 CN CN2010206465565U patent/CN201898204U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102916254A (en) * | 2012-10-30 | 2013-02-06 | 南京信息工程大学 | Miniaturized high-isolation wireless local area network antenna |
| CN110581347A (en) * | 2019-08-29 | 2019-12-17 | 电子科技大学 | A dual-loop antenna applied to 4G-MIMO smart glasses |
| CN116315739A (en) * | 2023-01-06 | 2023-06-23 | 西南大学 | Planar antenna unit and its array applied to 5G millimeter wave dual-band |
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Granted publication date: 20110713 |