CN104505590A - MIMO (Multi-Input Multi-Output) antenna structure of WIFI (Wireless Fidelity) terminal - Google Patents
MIMO (Multi-Input Multi-Output) antenna structure of WIFI (Wireless Fidelity) terminal Download PDFInfo
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- CN104505590A CN104505590A CN201410736244.6A CN201410736244A CN104505590A CN 104505590 A CN104505590 A CN 104505590A CN 201410736244 A CN201410736244 A CN 201410736244A CN 104505590 A CN104505590 A CN 104505590A
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Abstract
The invention discloses an MIMO (Multi-Input Multi-Output) antenna structure of a WIFI (Wireless Fidelity) terminal. The MIMO antenna structure comprises a main body, an earth plate, an MIMO antenna structure body, a sinking structure and a matching circuit module, wherein the earth plate and the MIMO antenna structure body are arranged on the main body; a first gap and a second gap which are symmetric to each other are formed in one end of the earth plate to form a first antenna clearance area and a second antenna clearance area respectively; the MIMO antenna structure body comprises a first antenna radiating body, a first feed part, a second antenna radiating body and a second feed part; an opening groove is formed in the lower end of a strip-shaped lug; the sinking structure is positioned at the opening groove; the matching circuit module is arranged between the first antenna radiating body and the second antenna radiating body; two ends of the matching circuit module are connected with the first antenna radiating body and the second antenna radiating body respectively. According to the MIMO antenna structure, by adopting the design of the sinking structure and the matching circuit module, the floor space is small, the isolating effect is better, and the communication quality of an antenna is higher.
Description
Technical field
The present invention relates to antenna technical field, particularly relate to a kind of mimo antenna structure of WIFI terminal.
Background technology
Up to now, WIFI (2.4GHz ~ 2.484GHz, 5.2GHz ~ 5.9GHz) terminal development, 802.11 series also development.Antenna in WIFI terminal also develops into MIMO antenna mode from early stage single input output antenna to be developed, and transmission rate constantly promotes.But in the small-sized terminals such as data card, due to limited space, antenna is placed just exists very large problem, as the frame mode adopting the antenna in below to place an antenna at middle part, actual emanations and the ability to accept of two antennas differ greatly, can adverse effect be there is for transfer of data, not have the effect of mimo antenna.Consult Fig. 1 and Fig. 2, Fig. 1 is mimo antenna structure of the prior art, as can be seen from Figure 1, this mimo antenna structure comprises ground plate 1 and symmetrically arranged first antenna radiator 21 and the second antenna radiator 22, first antenna radiator 21 and the second antenna radiator 22 and is connected with ground plate 1 each via the first current feed department 31 and the second current feed department 32.Fig. 2 is the impedance characteristic figure of mimo antenna in prior art, and as can be seen from Figure 2, under initial condition, the S11 parameter of mimo antenna can meet the requirement of-6dB, but the non-constant of isolation, can only-6dB be arrived.When adopting the frame mode designing antenna of full symmetric, due to size restrictions and layout, the space length of antenna can apart from very near, and the problem causing isolation undesirable produces.For this reason, be necessary to be further improved above-mentioned mimo antenna structure.
Summary of the invention
Technical problem to be solved by this invention is: provide little, the symmetrically arranged isolation between antennas in a kind of occupation of land space better, the mimo antenna structure of the good WIFI terminal of communication performance.
In order to solve the problems of the technologies described above, the technical solution used in the present invention is: the mimo antenna structure providing a kind of WIFI terminal, comprises main body and the ground plate that is arranged in main body and mimo antenna structure, also comprises sunken ground structure and matching circuit module,
One end of described ground plate offers the first symmetrical breach and the second breach, and surplus between the first breach and the second breach have bar shaped projection; Described first breach forms the first antenna headroom district and is positioned at the left side sidewall of ground plate, and the second breach forms the second antenna headroom district and is positioned at the right sidewall of ground plate;
Described mimo antenna structure comprises the first antenna radiator, the first current feed department, the second antenna radiator and the second current feed department, described first day beta radiation body is positioned at the first antenna headroom district, described second antenna radiator is positioned at the second antenna headroom district, described first antenna radiator and the second antenna radiator are symmetrical arranged, and the first antenna radiator is connected with ground plate by the first current feed department, the second antenna radiator is connected with ground plate by the second current feed department;
The lower end of described bar shaped projection is provided with open slot, and described sunken ground structure is positioned at open slot place; Described matching circuit module is arranged between the first antenna radiator and the second antenna radiator, and the two ends of matching circuit module connect the first antenna radiator and the second antenna radiator respectively.
Beneficial effect of the present invention is: when being different from the frame mode designing antenna of mimo antenna structure of the prior art employing full symmetric, due to size restrictions and layout, the space length of antenna can apart from very near, cause the problem that isolation is undesirable, the invention provides a kind of mimo antenna structure of WIFI terminal, mainly comprise ground plate, mimo antenna structure, fall into ground structure and matching circuit module, mimo antenna structure comprises the first symmetrical antenna radiator and the second antenna radiator and arranges the both sides of rectangular projection in ground plate respectively, sunken ground structure is arranged in the open slot of rectangular projection, and matching circuit module connects the first antenna radiator and the second antenna radiator, by sunken ground structure and matching circuit module, can obtain preferably antenna spacing from effect, and the good communication quality of antenna.In addition, structure of the present invention is simple, floor space, and easily implement, production cost is low.
Accompanying drawing explanation
Fig. 1 is the structural representation of mimo antenna structure in prior art;
Fig. 2 is the impedance characteristic figure of mimo antenna structure in prior art;
Fig. 3 is the structural representation of the mimo antenna structure of WIFI terminal of the present invention;
Fig. 4 is the impedance characteristic figure after the mimo antenna structure of WIFI terminal adds trap structure;
Fig. 5 is the structural representation of another embodiment of mimo antenna structure of WIFI terminal of the present invention;
Fig. 6 is the perspective view of Fig. 5;
Fig. 7 is the impedance characteristic figure after the mimo antenna structure of WIFI terminal adds matching circuit module;
Fig. 8 is the impedance characteristic contrast schematic diagram of three kinds of mimo antenna structures;
Fig. 9 is the antenna efficiency figure of three kinds of mimo antenna structures in Fig. 8.
Label declaration:
1, ground plate; 11, bar shaped projection; 21, the first antenna radiator; 22, the second antenna radiator;
31, the first current feed department; 32, the second current feed department; 4, ground structure is fallen into; 5, matching circuit module;
61, the first antenna headroom district; 62, the second antenna headroom district; 7, antenna substrate; 8, open slot.
Embodiment
By describing technology contents of the present invention in detail, realized object and effect, accompanying drawing is coordinated to be explained below in conjunction with execution mode.
The design of most critical of the present invention is: mimo antenna structure comprises the first symmetrical antenna radiator and the second antenna radiator and arranges the both sides of rectangular projection in ground plate respectively, sunken ground structure is arranged in the open slot of rectangular projection, and matching circuit module connects the first radiant body and the second radiant body, by sunken ground structure and matching circuit module, can obtain preferably antenna spacing from effect, and the good communication quality of antenna.
Please refer to Fig. 5 and Fig. 6, a kind of mimo antenna structure of WIFI terminal, comprise main body and be arranged on ground plate in main body 1 and mimo antenna structure, also comprise sunken ground structure 4 and matching circuit module 5,
One end of described ground plate 1 offers the first symmetrical breach and the second breach, and surplus between the first breach and the second breach have bar shaped projection 11; Described first breach forms the first antenna headroom district 61 and is positioned at the left side sidewall of ground plate 1, and the second breach forms the second antenna headroom district 62 and is positioned at the right sidewall of ground plate 1;
Described mimo antenna structure comprises the first antenna radiator 21, first current feed department 31, second antenna radiator 22 and the second current feed department 32, described first antenna radiator 21 is positioned at the first antenna headroom district 61, described second antenna radiator 22 is positioned at the second antenna headroom district 62, described first antenna radiator 21 and the second antenna radiator 22 are symmetrical arranged, and the first antenna radiator 21 is connected with ground plate 1 by the first current feed department 31, the second antenna radiator 22 is connected with ground plate 1 by the second current feed department 32;
The lower end of described bar shaped projection 11 is provided with open slot 8, and described sunken ground structure 4 is positioned at open slot 8 place; Described matching circuit module 5 is arranged between the first antenna radiator 21 and the second antenna radiator 22, and the two ends of matching circuit module 5 connect the first antenna radiator 21 and the second antenna radiator 22 respectively.
From foregoing description, beneficial effect of the present invention is: when being different from the frame mode designing antenna of mimo antenna structure of the prior art employing full symmetric, due to size restrictions and layout, the space length of antenna can apart from very near, cause the problem that isolation is undesirable, the invention provides a kind of mimo antenna structure of WIFI terminal, mainly comprise ground plate 1, mimo antenna structure, fall into ground structure 4 and matching circuit module 5, mimo antenna structure comprises the both sides that the first antenna radiator 21 and the second antenna radiator 22 arrange rectangular projection in ground plate 1 respectively, fall into the open slot 8 that ground structure 4 is arranged in rectangular projection, and matching circuit module 5 connects the first antenna radiator 21 and the second antenna radiator 22, by sunken ground structure 4 and matching circuit module 5, can obtain preferably antenna spacing from effect, and the good communication quality of antenna.
Further, the described bottom of the first antenna radiator 21 and the bottom of bar shaped projection 11 are reserved with and isolate gap, isolation gap, and the bottom of the second antenna radiator 22 and the bottom of bar shaped projection 11 are reserved with and isolate gap.The setting in isolation gap can make ground plate 1 and the first antenna radiator 21 and the second antenna radiator 22 have preferably isolation effect.
Further, described first antenna radiator 21 is formed with insulating space with the left side wall of bar shaped projection, and the second antenna radiator 22 is formed with insulating space with the right side wall of bar shaped projection.This insulating space can improve the isolation effect of the first antenna radiator 21 and the second antenna radiator 22 further together with sunken ground structure 4, ensures respective antenna radiator receiving and transmitting signal.
Further, also comprise the antenna substrate 7 arranging the first antenna headroom district 61 and the second antenna headroom district 62, described first antenna radiator 21 and the second antenna radiator 22 are all arranged on antenna substrate 7.Antenna substrate 7 is convenient to the fixed installation of the first antenna radiator 21 and the second antenna radiator 22, and fixed form is firm, and the electrical property of whole antenna is better.
Further, described matching circuit module 5 is an Inductive component.This Inductive component is serially connected between the first antenna radiator 21 and the second antenna radiator 22, can further improve antenna isolation effect by this Inductive component.Inductive component can multiple inductance of an inductance or serial connection.
Further, described first antenna radiator 21 and the second antenna radiator 22 support frequency to be 2.4GHz-2.48GHz low-frequency range and frequency is respectively the high band of 5.2GHz-5.9GHz.Described first antenna radiator 21 and the second antenna radiator 22 can support high band and low-frequency range according to concrete arranging, be applicable to whole WIFI frequency range, and when full frequency band efficiency is greater than 60%, isolation can be improved to below-10dB.
Further, the electrical length of described first antenna radiator 21 and the second antenna radiator 22 is 1/4 wavelength that Frequency is corresponding.
Please refer to Fig. 3, another embodiment of the present invention: a kind of mimo antenna structure of WIFI terminal, the ground plate 1 comprising main body and be arranged in main body and mimo antenna structure, also comprise sunken ground structure 4, one end of described ground plate 1 offers the first symmetrical breach and the second breach, and surplus between the first breach and the second breach have bar shaped projection 11; Described first breach forms the first antenna headroom district 61 and is positioned at the left side sidewall of ground plate 1, and the second breach forms the second antenna headroom district 62 and is positioned at the right sidewall of ground plate 1; Described mimo antenna structure comprises the first antenna radiator 21, first current feed department 31, second antenna radiator 22 and the second current feed department 32, described first antenna radiator 21 is positioned at the first antenna headroom district 61, described second antenna radiator 22 is positioned at the second antenna headroom district 62, described first antenna radiator 21 and the second antenna radiator 22 are symmetrical arranged, and the first antenna radiator 21 is connected with ground plate 1 by the first current feed department 31, the second antenna radiator 22 is connected with ground plate 1 by the second current feed department 32; The lower end of described bar shaped projection 11 is provided with open slot, and described sunken ground structure 4 is positioned at open slot place.
Consult Fig. 4, Fig. 4 is the impedance characteristic figure after the mimo antenna structure of WIFI terminal adds sunken ground structure, as can be seen from Figure 4, after adding sunken ground structure, low frequency isolation degree can be optimized to-8dB, high frequency front and back end isolation also can get at-10dB, center protrusion part can get at-8dB, and relative initial condition has certain optimization.
The properties of mimo antenna is described below by a concrete example.Ground plate plate is of a size of 20mmx80mm, and antenna is PCB printed antenna, and the headroom of antenna is 7mm*20mm, and the midfeather of 2 antennas is 6mm.But numerical value is above the size of object used in this example, not representing above numerical value is the best for this case antenna or minimum value.Consult Fig. 7, Fig. 7 is the impedance characteristic figure after the mimo antenna structure of WIFI terminal adds matching circuit module, this programme is directly introduced inductance and is optimized between the first antenna radiator and the second antenna radiator, viewed from result, whole WIFI needs 2.4GHz ~ 2.484GHz, 5.2GHz ~ 5.9GHz isolation S21 all can arrive below-10dB, and S11 can meet the design requirement of-6dB.Consult Fig. 8 and Fig. 9, Fig. 8 is the impedance characteristic contrast schematic diagram of three kinds of mimo antenna structures, Fig. 9 is the antenna efficiency figure of three kinds of mimo antenna structures in Fig. 8, as can be seen from Fig. 8 and Fig. 9, this programme from end-state viewed from result relatively other two states have the lifting of certain amplitude, so scheme improves the isolation of system under the prerequisite of radiance promoting antenna.
In sum, the antenna structure of WIFI terminal provided by the invention, comprise ground plate, mimo antenna structure, fall into ground structure and matching circuit module, wherein, mimo antenna structure comprises the first symmetrical antenna radiator and the second antenna radiator and arranges the both sides of rectangular projection in ground plate respectively, sunken ground structure is arranged in the open slot of rectangular projection, and matching circuit module connects the first antenna radiator and the second antenna radiator, by sunken ground structure and matching circuit module, can obtain preferably antenna spacing from effect, and the good communication quality of antenna.In addition, structure of the present invention is simple, floor space, and easily implement, production cost is low.
The foregoing is only embodiments of the invention; not thereby the scope of the claims of the present invention is limited; every equivalents utilizing specification of the present invention and accompanying drawing content to do, or be directly or indirectly used in relevant technical field, be all in like manner included in scope of patent protection of the present invention.
Claims (7)
1. a mimo antenna structure for WIFI terminal, comprises main body and the ground plate that is arranged in main body and mimo antenna structure, it is characterized in that, also comprise sunken ground structure and matching circuit module,
One end of described ground plate offers the first symmetrical breach and the second breach, and surplus between the first breach and the second breach have bar shaped projection; Described first breach forms the first antenna headroom district and is positioned at the left side sidewall of ground plate, and the second breach forms the second antenna headroom district and is positioned at the right sidewall of ground plate;
Described mimo antenna structure comprises the first antenna radiator, the first current feed department, the second antenna radiator and the second current feed department, described first day beta radiation body is positioned at the first antenna headroom district, described second antenna radiator is positioned at the second antenna headroom district, described first antenna radiator and the second antenna radiator are symmetrical arranged, and the first antenna radiator is connected with ground plate by the first current feed department, the second antenna radiator is connected with ground plate by the second current feed department;
The lower end of described bar shaped projection is provided with open slot, and described sunken ground structure is positioned at open slot place; Described matching circuit module is arranged between the first antenna radiator and the second antenna radiator, and the two ends of matching circuit module connect the first antenna radiator and the second antenna radiator respectively.
2. the mimo antenna structure of WIFI terminal according to claim 1, is characterized in that, the bottom of described first antenna radiator and the second antenna radiator is reserved with the bottom of bar shaped projection respectively and isolates gap.
3. the mimo antenna structure of WIFI terminal according to claim 1, is characterized in that, the left side wall of described first antenna radiator and bar shaped projection and the right side wall of the second antenna radiator and bar shaped projection are all formed with insulating space.
4. the mimo antenna structure of WIFI terminal according to claim 1, it is characterized in that, also comprise the antenna substrate arranging the first antenna headroom district and the second antenna headroom district, described first antenna radiator and the second antenna radiator are all arranged on antenna substrate.
5. the mimo antenna structure of the WIFI terminal according to any one of claim 1-4, is characterized in that, described matching circuit module is an Inductive component.
6. the mimo antenna structure of the WIFI terminal according to any one of claim 1-4, it is characterized in that, it is the high band of 5.2GHz-5.9GHz that described first antenna radiator and the second antenna radiator support frequency to be 2.4GHz-2.48GHz low-frequency range and frequency respectively.
7. the mimo antenna structure of the WIFI terminal according to any one of claim 1-4, is characterized in that, the electrical length of described first antenna radiator and the second antenna radiator is 1/4 wavelength corresponding to Frequency.
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| CN201410736244.6A CN104505590B (en) | 2014-12-05 | 2014-12-05 | The mimo antenna structure of WIFI terminal |
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| WO2021082679A1 (en) * | 2019-10-29 | 2021-05-06 | 深圳Tcl新技术有限公司 | Dual-band antenna system and terminal device |
| US11515632B2 (en) | 2020-04-22 | 2022-11-29 | Inventec Appliances (Pudong) Corporation | Dual-band antenna and antenna module using the same |
| CN112421208A (en) * | 2020-11-09 | 2021-02-26 | 青岛海信移动通信技术股份有限公司 | Electronic equipment and antenna device |
| CN112838362B (en) * | 2021-01-04 | 2023-05-09 | 北京小米移动软件有限公司 | Antenna structure and terminal equipment |
| CN112838362A (en) * | 2021-01-04 | 2021-05-25 | 北京小米移动软件有限公司 | Antenna structure and terminal equipment |
| WO2022160823A1 (en) * | 2021-01-28 | 2022-08-04 | 京东方科技集团股份有限公司 | Antenna and manufacturing method therefor |
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| CN114843779A (en) * | 2022-06-13 | 2022-08-02 | 深圳汉阳天线设计有限公司 | Double-antenna structure with high isolation and design method |
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