CN104485512A - LTE (Long Term Evolution) carrier aggregation antenna for portable type equipment with metal framework - Google Patents
LTE (Long Term Evolution) carrier aggregation antenna for portable type equipment with metal framework Download PDFInfo
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Abstract
The invention discloses an LTE (Long Term Evolution) carrier aggregation antenna for portable type equipment with a metal framework. The LTE carrier aggregation antenna comprises a shell, a grounding plate, the metal framework and an antenna assembly, wherein the metal framework is symmetrically provided with a first gap and a second gap; the metal framework is divided into an upper frame section and a lower frame section by the first gap and the second gap; the antenna assembly comprises a radiation main body, a first feed part, a second feed part, a band-pass filter, a low-frequency matching module and a high-frequency matching module; the radiation main body is the upper frame section; the first feed part and the second feed part are located in an antenna clearance zone; the first feed part and the second feed part are parallel to each other; the first feed part is connected with the radiation main body by the low-frequency matching module; the second feed part is connected with the radiation main body by the high-frequency matching module. The LTE carrier aggregation antenna can support an out-of-band carrier aggregation antenna of an LET-A technology, the data transmission rate is extremely improved and the communication performance is good.
Description
Technical field
The present invention relates to antenna technical field, particularly relating to a kind of LTE carrier aggregation antenna for having metal framework portable set.
Background technology
Along with developing rapidly of LTE technology, increasing portable set starts to support LTE technology.In LTE antenna design, the requirement of the beamwidth of antenna is: low-frequency band wide region is 698-960MHz, and high frequency bandwidth scope is 1710-2690MHz.Need in common LTE technology to use mimo antenna.In order to improve data transmission efficiency further, LTE-A technology also needs to use carrier aggregation antenna.
On the one hand, in order to increase the aesthetic of the outer surface of mobile device, designer starts extensively to adopt metal finishing framework as frame.The nearly section time, market there is the antenna structure based on metal framework, but major part is based in the antenna structure of metal framework, metal framework is just as a part for antenna radiation unit, thus above-mentioned antenna structure also needs main part design (as FPC antenna radiating element or LDS antenna radiation unit) considering antenna radiation unit, and this main part is arranged on antenna holder usually.For this structure, the electromagnetic coupled of antenna holder antenna radiates body and metal framework or interaction force are very large, and this can increase the difficulty of Antenna Design.In addition, antenna radiator is arranged on antenna holder also can increase production cost.Therefore, metal framework being served as complete antenna radiator is ideal scheme, so not only can simplify designing program of antenna, can also reduce the production cost of antenna.The nearly section time, the antenna structure of iPhone 6 is exactly utilize outside metal framework as complete antenna radiator, but for covering the whole frequency range of LTE, needs to set up switch.Concrete, LTE low-frequency range (698 – 960MHz) bandwidth is divided into multiple frequency sub-band by switch by the antenna structure of iPhone 6., usually, for the design covering LTE low-frequency range by switch form, be generally whole low-frequency range will be divided into three frequency sub-band.Owing to there is frequency range gap between frequency sub-band, the shortcoming of above-mentioned antenna structure at its frequency sub-band in the frequency range with wider bandwidth can not be covered in low-frequency range, such as frequency range 28.
On the other hand, in order to strengthen the data transmission efficiency of mobile communication system further, in third generation partner program LTE-A specification, introduce carrier aggregation technology.Carrier aggregation technology can be implemented at band intercarrier polymerization (Continuous Band or discontinuous frequency range) or the outer carrier aggregation of band (discontinuous frequency range).In the polymerization of band intercarrier, all carrier waves are all in same working band (such as LTE low-frequency range), and in the outer carrier aggregation of band, carrier wave is in different working frequency range.For Antenna Design, the polymerization of band intercarrier easily realizes, and the flexibility ratio of the outer carrier aggregation of band is better than the polymerization of band intercarrier, so be with outer carrier aggregation to be used as a rule.At present, in the specification of LTE-A that proposes of third generation partner program (3GGP), the outer carrier aggregation of band comprises 12 band numbers to different working frequency range.With regard to Antenna Design, a major prerequisites condition of outer carrier aggregation is with to be the suitable RF front end structure of selection one.This is because the RF front end structure of legacy cellular antenna only has single feed end.If use traditional RF framework, (when not needing to use switch) band intercarrier polymerization can easier realize, but the outer carrier aggregation of band only could realize the working frequency range of duplexer is synchronous with antenna feed.This needs the duplexer of different frequency range synchronously or to mate, but the duplexer of described different frequency range is synchronous or matching scheme is difficult to realize.
LTE antenna for the overwhelming majority of mobile device use is all the antenna scheme not outer carrier aggregation of appropriate bands and the baroque problems based on single feed end, is necessary to be improved further the antenna structure of above-mentioned portable set.
Summary of the invention
The invention provides a kind of LTE carrier aggregation antenna for having metal framework portable set, the technical problem mainly solved is that a kind of structure of design is simple, the outer carrier aggregation antenna of the band of LTE-A technology can be supported, particularly for the equipment with metal framework.
In order to solve the problems of the technologies described above, the technical solution used in the present invention is: provide a kind of LTE carrier aggregation antenna for having metal framework portable set, comprise housing, ground plate, metal framework and antenna module, described ground plate is placed in housing, described metal framework is fixed on the surrounding sidewall of housing, containing cavity is provided with bottom described metal framework and between ground plate
Described metal framework offers symmetrically the first gap and the second gap, metal framework is divided into frame epimere and frame hypomere by described first gap and the second gap, forms antenna headroom district between described frame hypomere and ground plate;
Described antenna module comprises radiating principal, first current feed department, second current feed department, low frequency matching module and high frequency matching module, band pass filter, described radiating principal is frame hypomere, described first current feed department and the second current feed department are all positioned at antenna headroom district and the first current feed department and the second current feed department are parallel to each other, described first current feed department is connected with radiating principal by low frequency matching module, described second current feed department is connected with radiating principal by high frequency matching module, one end of described band pass filter is connected with radiating principal, the other end of described band pass filter extends to ground plate, described band pass filter is mainly used in improving the performance of antenna at high band.Here, described low frequency and high frequency matching module not only will have the function of mating its corresponding feed port frequency range, also will ensure the requirement meeting isolation between low frequency and the feed port of high frequency, therefore this matching module also will have the effect of filtering or have the function of duplexer while having coupling simultaneously.
Beneficial effect of the present invention is: the LTE antenna being different from the overwhelming majority that mobile device in prior art uses is all problems of the antenna scheme not outer carrier aggregation of appropriate bands based on single feed end, the invention provides a kind of LTE carrier aggregation antenna for having metal framework portable set, adopt and the first parallel current feed department and the second current feed department are set in antenna headroom district, first current feed department supports low frequency frequency range, second current feed department supports high-frequency band, first current feed department is connected with radiating principal respectively by the low frequency matching module and high frequency matching module with filtering or duplexer functionality with the second current feed department, can realize being with outer carrier aggregation, greatly improve data transmission efficiency, and band pass filter can improve the performance of antenna at high band, in addition, directly utilizing the second framework of metal framework as radiating principal, without the need to designing additional radiation agent structure, can antenna structure be simplified, reduce the production cost of antenna, improve the manufacture efficiency of antenna.
Accompanying drawing explanation
Fig. 1 is the structural representation of LTE carrier aggregation antenna of the present invention;
Fig. 2 is the fundamental diagram of LTE carrier aggregation antenna of the present invention;
Fig. 3 is the return loss plot figure of LTE carrier aggregation antenna of the present invention;
Fig. 4 is the antenna efficiency figure of LTE carrier aggregation antenna low-frequency range of the present invention;
Fig. 5 is the antenna efficiency figure of LTE carrier aggregation antenna high band of the present invention;
Fig. 6 is that the high band return loss plot of LTE carrier aggregation antenna of the present invention is with inductance variation diagram in the band-pass filter;
Fig. 7 is the structural representation of another embodiment of LTE carrier aggregation antenna of the present invention.
Label declaration:
11, frame epimere; 12, frame hypomere; 2, ground plate; 31, the first current feed department;
32, the second current feed department; 4, containing cavity; 5, USB interface; 6, band pass filter;
71, the first gap; 72, the second gap.
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: adopt and arrange independently the first current feed department and the second current feed department in antenna headroom district, first current feed department supports low frequency frequency range, second current feed department supports high-frequency band, first current feed department is connected with radiating principal respectively by the low frequency matching module and high frequency matching module with filtering or duplexer functionality with the second current feed department, the band pass filter of included its performance that changes of high band, thus can realize being with outer carrier aggregation.
Please refer to Fig. 1 and Fig. 2, a kind of LTE carrier aggregation antenna for having metal framework portable set, comprise housing, ground plate 2, metal framework and antenna module, described ground plate 2 is placed in housing, described metal framework is fixed on the surrounding sidewall of housing, containing cavity 4 is provided with bottom described metal framework and between ground plate 2, described metal framework offers symmetrically the first gap 71 and the second gap 72, metal framework is divided into frame epimere 11 and frame hypomere 12 by described first gap 71 and the second gap 72, antenna headroom district is formed between described frame hypomere 12 and ground plate 2, described antenna module comprises radiating principal, first current feed department 31, second current feed department 32, there is low frequency matching module and the high frequency matching module of filtering or duplexer functionality, described radiating principal is frame epimere 11, described first current feed department 31 and the second current feed department 32 are all positioned at antenna headroom district and the first current feed department 31 and the second current feed department 32 are parallel to each other, described first current feed department 31 is connected with radiating principal by low frequency matching module, described second current feed department 32 is connected with radiating principal by high frequency matching module, one end of described band pass filter 6 is connected with radiating principal, the other end of described band pass filter 6 extends to ground plate 2, described band pass filter is mainly used in improving the performance of antenna at high band.Here, described low frequency and high frequency matching module not only will have the function of mating its corresponding feed port frequency range, also will ensure the requirement meeting isolation between low frequency and the feed port of high frequency, therefore this matching module also will have the effect of filtering or have the function of duplexer while having coupling simultaneously.
From foregoing description, beneficial effect of the present invention is: the LTE antenna being different from the overwhelming majority that mobile device in prior art uses is all problems of the antenna scheme not outer carrier aggregation of appropriate bands based on single feed end, the invention provides a kind of LTE carrier aggregation antenna for having metal framework portable set, adopt and the first parallel current feed department 31 and the second current feed department 32 is set in antenna headroom district, first current feed department 31 supports low frequency frequency range, second current feed department 32 supports high-frequency band, first current feed department 31 is connected with radiating principal respectively by the low frequency matching module and high frequency matching module with filtering or duplexer functionality with the second current feed department 32, can realize being with outer carrier aggregation, greatly improve data transmission efficiency, and band pass filter can improve the performance of antenna at high band, in addition, directly utilizing the second framework of metal framework as radiating principal, without the need to designing additional radiation agent structure, can antenna structure be simplified, reduce the production cost of antenna, improve the manufacture efficiency of antenna.
Further, the left side wall of described metal framework offers the first gap 71, the right side wall of metal framework offers the second gap 72, and the first gap 71 and the second gap 72 are all near metal framework bottom position.The slotting structure that the metal framework left and right sides is arranged, the length of the second framework can be made better, and namely the length of radiating principal is good, the stable performance of antenna.
Further, the bottom of described metal framework offers the first gap 71 and the second gap 72, and the first gap 71 and the second gap 72 are respectively near metal left side wall and right side wall.It is pointed out that offering two gaps in the bottom of metal framework is the replacement scheme offering two gaps in the metal framework left and right sides, and the slotting structure offered bottom metal framework, when can prevent from conversing, the contact gap of hand, improves communication quality.
Further, also comprise the band pass filter 6 being arranged at antenna headroom district, one end of described band pass filter 6 is connected with radiating principal, and the other end of described band pass filter 6 extends to ground plate 2.Above-mentioned band pass filter 6 can not only realize the synchronous impedance coupling of low-frequency range and high band, but also can promote the performance of antenna in high-frequency band.
Further, described band pass filter 6 comprises electric capacity and the inductance of serial connection.Resonance frequency and the Q value of band pass filter 6 are decided by the value of electric capacity and inductance.
Further, also comprise the USB interface 5 being arranged at antenna headroom district, described USB interface 5 is positioned on the perpendicular bisector bottom metal framework, and USB interface 5 is connected with ground plate 2.Although increase the overall performance design of USB interface 5 on antenna affect comparatively greatly or add the design difficulty of integrated antenna, increase the practicality that this USB interface 5 can improve this antenna design widely in the design.In addition, the present invention program is also applicable to the situation of the LTE carrier aggregation antenna not arranging USB interface.
Further, the low-frequency range that described first current feed department 31 is supported is for being less than 1GHz frequency, and the high-frequency range that described second current feed department 32 is supported is for being greater than 1.7GHz frequency.
Please refer to Fig. 1, embodiments of the invention one are: a kind of LTE carrier aggregation antenna for having metal framework portable set, comprise housing, ground plate 2, metal framework and antenna module, described ground plate 2 is placed in housing, described metal framework is fixed on the surrounding sidewall of housing, containing cavity 4 is provided with bottom described metal framework and between ground plate 2, the left and right sides wall of described metal framework offers the first gap 71 and the second gap 72 symmetrically, symmetry axis is the perpendicular bisector of framework broadside, metal framework is divided into frame epimere 11 and frame hypomere 12 by described first gap 71 and the second gap 72, antenna headroom district is formed between described frame hypomere 12 and ground plate 2, described antenna module comprises radiating principal, the first current feed department 31, second current feed department 32, band pass filter 6, the low frequency matching module with filtering or duplexer functionality and high frequency matching module, described radiating principal is frame hypomere 12, described first current feed department 31 and the second current feed department 32 are all positioned at antenna headroom district and the first current feed department 31 and the second current feed department 32 are parallel to each other, described first current feed department 31 is connected with radiating principal by low frequency matching module, and described second current feed department 32 is connected with radiating principal by high frequency matching module.
Please refer to Fig. 7, embodiments of the invention two are: a kind of LTE carrier aggregation antenna for having metal framework portable set, comprise housing, ground plate 2, metal framework and antenna module, described ground plate 2 is placed in housing, described metal framework is fixed on the surrounding sidewall of housing, containing cavity 4 is provided with bottom described metal framework and between ground plate 2, offer the first gap 71 and the second gap 72 bottom symmetrical of described metal framework, symmetry axis is the perpendicular bisector of framework broadside, metal framework is divided into frame epimere 11 and frame hypomere 12 by described first gap 71 and the second gap 72, antenna headroom district is formed between described frame hypomere 12 and ground plate 2, described antenna module comprises radiating principal, the first current feed department 31, second current feed department 32, band pass filter 6, low frequency matching module and high frequency matching module, described radiating principal is frame hypomere 12, described first current feed department 31 and the second current feed department 32 are all positioned at antenna headroom district and the first current feed department 31 and the second current feed department 32 are parallel to each other, described first current feed department 31 is connected with radiating principal by low frequency matching module, and described second current feed department 32 is connected with radiating principal by high frequency matching module, one end of described band pass filter 6 is connected with radiating principal, and the other end of described band pass filter 6 extends to ground plate 2.
Embodiment one and the difference of embodiment two are that on metal framework, offer the position in symmetrical gap different.It is good that symmetry offers gap outward appearance, meets the aesthetical standard of consumer.Compare in the left and right sides with driveing with gap, the contact can avoiding hand when portable set uses and gap bottom metal framework is opened in gap, raising communication quality.In addition, this programme can also be applicable to the antenna structure of the LTE carrier aggregation not having metal framework.
Table 1 is the carrier aggregation logarithm of all band number of the outer carrier aggregation of band, and this table comprises 12 band numbers to different working frequency range.As can be seen from following table, except the carrier aggregation of frequency range 3 and frequency range 7, the low band frequencies of other 11 pairs of carrier aggregation is all less than 1.0GHz, and high-band frequency is all greater than 1.7GHz.Therefore, by arranging the first current feed department and the second current feed department can realize the outer carrier aggregation of (except frequency range 3 and frequency range 7) band, and do not need in front end structure, use the duplexer being difficult to realize to desynchronize and mate high band and low-frequency range.If further, the carrier aggregation of all frequency ranges will be supported, need to arrange and support that frequency range is the 3rd current feed department of 2.5GHz-2.69GHz, with the carrier aggregation between band support 3 and frequency range 7.The emphasis that this programme realizes is emphatically to other 11 Antenna Designs to (both except frequency range 3 and frequency range 7) polymerization carrier wave.
| Band number | Descending (MHz) | Up (MHz) | Logarithm |
| 1 | 1920-1980 | 2110-2170 | 5,18,19 |
| 2 | 1850-1910 | 1930-1990 | 17 |
| 3 | 1710-1785 | 1805-1880 | 5,7,20 |
| 4 | 1710-1755 | 2110-2155 | 12,13.17 |
| 5 | 824-849 | 869-894 | 1,3 |
| 7 | 2500-2570 | 2620-2690 | 3,20 |
| 12 | 699-716 | 729-746 | 4 |
| 13 | 777-787 | 746-756 | 4 |
| 17 | 704-716 | 734-746 | 2,4 |
| 18 | 815-830 | 860-875 | 1 |
| 19 | 830-845 | 875-890 | 1 |
| 20 | 832-862 | 791-821 | 4,7 |
Table 1
Here tests the working parameters of this programme antenna system.Fig. 3 is the return loss plot figure of LTE carrier aggregation antenna of the present invention, and as can be seen from Figure 3, antenna low-frequency range curve S 11 covers the low frequency part of LTE completely, and antenna high band curve S 22 covers the HFS of LTE completely.In addition, the low-frequency range of this programme and the isolation of high band are very good, are better than-43dB at low frequency part isolation, and HFS isolation is better than-27dB.The antenna efficiency figure of Fig. 4 to be the antenna efficiency figure of LTE carrier aggregation antenna low-frequency range of the present invention, Fig. 5 be LTE carrier aggregation antenna high band of the present invention, can find out that from Fig. 4 and Fig. 5 this programme meets the requirement of antenna to radiation efficiency.Fig. 3 to Fig. 5 shows, the antenna system of the proposition of this programme all can meet the demands in required various aspects.Fig. 6 is that the high band return loss of LTE antenna of the present invention is with the inductance change curve in band pass filter, according to different inductance value L, (L is difference L0,0.7*L0,0.0*L0,1.4*L0) test the return loss of LTE carrier aggregation antenna, wherein L0 is the best inductance value of inductance in band pass filter.As can be seen from Figure 6, inductance value is very large to the effect of high band.If inductance value is excessive or too small relative to optimum value, the high band of antenna does not meet LTE high frequency requirements.Only when inductance value is suitable, the high band of antenna could meet design requirement very well.But above-mentioned band pass filter is very large on the impact of high frequency, negligible on the impact of low frequency.Therefore, the simultaneously match of high band and low-frequency range can be realized by band pass filter, so the outer carrier aggregation of the band that can realize LTE.
In sum, a kind of LTE carrier aggregation antenna for having metal framework portable set of the present invention, adopt and the first parallel current feed department and the second current feed department are set in antenna headroom district, band pass filter, first current feed department supports low frequency frequency range, second current feed department supports high-frequency band, and the first current feed department is connected with radiating principal respectively by the low frequency matching module and high frequency matching module with filtering or duplexer functionality with the second current feed department; Separately directly utilize the second framework of metal framework as radiating principal, without the need to designing additional radiation agent structure, its advantage is as follows:
1, the antenna system of this programme not only LTE carrier aggregation in tenaculum, and can the outer LTE carrier aggregation of tenaculum, and existing most of LTE antenna system (under the single feed condition not using switch designs) only can LTE carrier aggregation in tenaculum, can not the outer LTE carrier aggregation of tenaculum.
2, the structure of the outer LTE carrier aggregation of this programme tenaculum is employing two feed ends, and the first feed end supports the frequency of below 1GHz, and the second feed end supports the frequency of more than 1.7GHz.
3, this programme have employed the band pass filter that acts on high band, can realize when carrying out synchronous impedance matching to low-frequency range and high band to when high band improvement in performance simultaneously.
4, this programme is whole antenna radiator with its metal framework, can save cost and easily implement.
5, this programme structure is simple, although and use metal framework as the unique radiant body of antenna in iPhone 6, and need to utilize switch that low-frequency range is divided into multiple frequency sub-band, and not only can not LTE carrier aggregation in tenaculum more can not LTE carrier aggregation outside tenaculum, simultaneously because it using switch so also more difficult band support 28.
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 (6)
1. one kind for having the LTE carrier aggregation antenna of metal framework portable set, comprise housing, ground plate, metal framework and antenna module, described ground plate is placed in housing, described metal framework is fixed on the surrounding sidewall of housing, containing cavity is provided with bottom described metal framework and between ground plate, it is characterized in that
Described metal framework offers symmetrically the first gap and the second gap, metal framework is divided into frame epimere and frame hypomere by described first gap and the second gap, forms antenna headroom district between described frame hypomere and ground plate;
Described antenna module comprises radiating principal, the first current feed department, the second current feed department, band pass filter, the low frequency matching module with filtering or duplexer functionality and high frequency matching module, described radiating principal is frame hypomere, described first current feed department and the second current feed department are all positioned at antenna headroom district and the first current feed department and the second current feed department are parallel to each other, described first current feed department is connected with radiating principal by low frequency matching module, and described second current feed department is connected with radiating principal by high frequency matching module; One end of described band pass filter is connected with radiating principal, and the other end of described band pass filter extends to ground plate.
2. the LTE carrier aggregation antenna for having metal framework portable set according to claim 1, it is characterized in that, the left side wall of described metal framework offers the first gap, the right side wall of metal framework offers the second gap, and the first gap and the second gap are all near metal framework bottom position.
3. the LTE carrier aggregation antenna for having metal framework portable set according to claim 1, it is characterized in that, the bottom of described metal framework offers the first gap and the second gap, and the first gap and the second gap are respectively near metal left side wall and right side wall.
4. the LTE carrier aggregation antenna for having metal framework portable set according to claim 1, is characterized in that, described band pass filter comprises electric capacity and the inductance of serial connection, and band pass filter is operated in the high band of LTE.
5. the LTE carrier aggregation antenna for having metal framework portable set according to any one of claim 1-4, it is characterized in that, also comprise the USB interface being arranged at antenna headroom district, described USB interface is positioned on the perpendicular bisector bottom metal framework, and USB interface is connected with ground plate.
6. the LTE carrier aggregation antenna for having metal framework portable set according to claim 5, it is characterized in that, the low-frequency range of described first current feed department support is for being less than 1GHz frequency, and the high-frequency range of described second current feed department support is for being greater than 1.7GHz frequency.
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