CN201845871U - Two-unit-broadband MIMO (multiple input multiple output) antenna array - Google Patents
Two-unit-broadband MIMO (multiple input multiple output) antenna array Download PDFInfo
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- CN201845871U CN201845871U CN2010205853440U CN201020585344U CN201845871U CN 201845871 U CN201845871 U CN 201845871U CN 2010205853440 U CN2010205853440 U CN 2010205853440U CN 201020585344 U CN201020585344 U CN 201020585344U CN 201845871 U CN201845871 U CN 201845871U
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Abstract
The utility model provides a two-unit-broadband MIMO (multiple input multiple output) antenna array, which comprises a dielectric substrate and antenna units (15a and 15b) of an MIMO antenna. The relative dielectric constant of the dielectric substrate ranges from 1 to 100 while the thickness thereof ranges from 0.2mm to 5mm. The two-unit-broadband MIMO antenna array is characterized in that the antenna unit (15a) and the antenna unit (15b) are mutually perpendicular along opposite directions, gaps are embedded on a floor, and two radiating elements of each antenna unit form paired strip structures (17a and 17b), thereby being capable of effectively improving impedance bandwidth so as to achieve the purpose of wide bandwidth. The two-unit-broadband MIMO antenna array resolves problems that an existing two-unit MIMO antenna cannot realize small cross coupling, wide bandwidth and small size, is unstable in performance and the like, and is compact in structure, small in size, low in cost and fine in characteristic. The antenna units are in plane arrangement and can be printed on a circuit board quite easily, and accordingly, compared with an MIMO antenna array with three-dimensional structure, the two-unit-broadband MIMO antenna array is more suitable to be integrated in a mobile terminal equipment system.
Description
Technical field
The utility model relates to mobile communication technology, is specifically related to a kind of two unit wideband MIMO antenna arrays, overcomes problems such as the little mutual coupling that can't realize in the existing two unit MIMO antennas, wide bandwidth, small size, unstable properties, its compact conformation, size is little, and cost is low, and characteristic is good.Because antenna element of the present utility model adopts planar alignment, be printed on the circuit board at an easy rate, so the MIMO antenna array of the utility model comparison three-dimensional structure is more suitable for being integrated in the mobile terminal device system.
Background technology
Radio communication is one of most active scientific research field in the world today.It has broken through the physical restriction of wire communication, makes the user freely to communicate in the place that any radio wave can arrive, and this has widened the space and the vigor of communication greatly.The subject matter that present radio communication faces is the message transmission rate that how to provide higher.Because it is saturated that radio communication has been on the verge of at present so as to the traditional resource tradition---frequency bandwidth and transmitting power---that improves message transmission rate, it is impracticable therefore relying on the loss that increases these two kinds of resources to improve transmission rate.3G (Third Generation) Moblie (3G) is used by commercial in comprising a plurality of countries of China.But because still traditional wireless communication technology that 3G mainly adopts, the data transmission rate that can provide still is (384kbit/s-2Mbit/s) on the low side, operator can't provide " killer " business and attract the user, and 3G uses in global large-scale commercial applications and has difficulty in taking a step.In recent years, a kind of new not needing lost the wireless communication technology---MIMO (Multiple-Input Multiple-Output, multiple-input and multiple-output) technology---that frequency band and transmit power resource just can increase substantially data transmission rate and caused concern widely.At present, the MIMO technology has been considered the important component part of the 4th third-generation mobile communication technology (4G).
The MIMO antenna technology is one of main core technology of mimo wireless communication technology, and it is meant simultaneously adopts the complex array antenna at the transmitting-receiving both-end.Traditional wireless communication system is meant the antenna system that adopts a transmitting antenna and a reception antenna simultaneously at the transmitting-receiving both-end, the single output of promptly so-called single input (SISO) antenna system.The SISO antenna system has the neck bottle that can not break through in the communication---Shannon capacity limit on the channel capacity, no matter adopt which kind of modulation technique, coding strategy or additive method, always wireless channel has been done an actual physical restriction to wireless communication engineering.
Under the condition that does not increase spectral bandwidth and transmitting power, use the multi-antenna diversity technology, improve the transmitting/receiving signal signal to noise ratio, to increase the capacity of system, this is the development trend of present wireless communication system.In recent years, mainly by polynary transmitting antenna array, the unit receives single antenna (MISO antenna system) and realizes diversity gain.Because the space of mobile terminal device is limited, the application of SIMO (the many outputs of single input) antenna system causes the processing complexity of portable terminal, so its feasibility is low.But no matter be MISO or SIMO system, when the antenna number reached some, the improvement of channel capacity was very little.And mimo system is only the real wireless communication system that can realize increasing substantially channel capacity by diversity gain, and its channel capacity increases along with the increase of number of antennas.
For handheld device, a plurality of antennas are integrated in the little space, can cause very big mutual coupling, the performance of antenna just descends thereupon, just can't realize that channel capacity is along with the increase of number of antennas increases with linear scale.How reducing the aerial array size, the coupling that reduces simultaneously between antenna element is the difficult point of MIMO Antenna Design.The main method that reduces at present to be coupled has: adopt the EBG floor panel structure, embed finedraw on the floor, add reflector element, perhaps increase floor branch.
But in existing MIMO Antenna Design, what mainly consider also is the mutual coupling problem that how to reduce between antenna element, mainly adopts one of above four kinds of methods to reduce mutual coupling.Tend to influence impedance matching when reducing mutual coupling, cause impedance bandwidth narrow, the antenna array performance instability.And MIMO antenna element of the present utility model adopts the biobelt line structure, and it can help to reduce the mutual coupling between two antenna elements, has introduced partition capacitance simultaneously, improves impedance matching, reaches the purpose of wide impedance bandwidth.Low, the problems such as size is big, unstable properties of narrow bandwidth, the isolation that the utility model has solved the MIMO antenna.
Because the channel capacity and the dual-mode antenna number of mimo wireless communication system are linear, but the stability and the correlation between antenna element of the performance of channel capacity and mimo system, MIMO aerial array are relevant.The performance of MIMO aerial array is stable more, and the correlation between antenna element is low more, and the performance of mimo system is just good more, and the superiority of MIMO antenna system just can show more.The frequency that mimo wireless communication system is distributed all over the world is different, and the design of the MIMO antenna system of wide bandwidth, isolation height, stable performance is very important.In order to reduce the mutual coupling between antenna element, developed the method that has formed multiple raising isolation at present.
U.S. Pat 7411554B2, " MIMO antenna operable in multiband " proposed two unit MIMO antennas as Fig. 1.Among Fig. 1: (101) are the MIMO antenna, and (105) are antenna element, and (110) are radiating element, (111) be the feed part of radiating element (110), (115) are the sweep of radiating element (110), and (130) are switching controller, (150) be the floor, (151) are compatible portion.This big distance of inventing between Unit two is controlled at the influence of mutual coupling in certain scope, and the control MIMO antenna that opens or closes by switching controller (130) is operated in low frequency or high-frequency, but this can increase the complexity and the manufacturing cost of making.Because the antenna in this invention has all occupied most of area of medium substrate, integrated other circuit elements on medium substrate, very difficulty.
The utility model content
The purpose of this utility model is to overcome weak point of the prior art, and a kind of two unit wideband MIMO antenna arrays are provided, and overcomes the problem of the little mutual coupling that can't realize in the existing two unit MIMO antennas, small size, wide bandwidth.
The purpose of this utility model is achieved through the following technical solutions: two unit wideband MIMO antenna arrays, the antenna element (15a) and antenna element (15b) that comprise medium substrate (11) and MIMO antenna, wherein, described medium substrate (11) comprises the medium substrate back side (12) and medium substrate front (13), floor (14) is printed on the medium substrate back side (12), antenna element (15a) is vertical mutually in opposite direction with antenna element (15b), is embedded with slot (16) on described floor (14).In theory, two orthogonal antennas are mismatches, promptly do not receive the signal from the other side mutually, so the MIMO aerial array in the utility model can reduce the mutual coupling that space wave causes by adopting orthogonal antenna element design; And on the floor between two antenna elements, embedding slot (16), this slot (16) has sunken stream effect for the surface current that is distributed on the floor (14), so can reduce the mutual coupling that the floor surface ripple causes.Reaching under the effect that reduces the mutual coupling that space wave and surface wave cause simultaneously, also under the prerequisite that guarantees high-isolation, make that the distance between two antenna elements can greatly reduce, to reach the goal of the invention of the size that has reduced antenna array significantly.In addition, since most floor (14) surface current be distributed in finedraw around, it is very little that other local distributed currents are gone up on floor (14), so reduce floor (14) size, even on the system media substrate, place conductive devices, the performance of MIMO antenna is affected little, stable performance of the present utility model.
It is 1-100 that described medium substrate (11) adopts relative dielectric constant, the medium substrate of thickness 0.2-5mm.
Optimized technical scheme is: described antenna element (15a) and antenna element (15b) 45 degree that tilt in opposite direction, and to form orthogonal attitude.
Optimized technical scheme is: described antenna element (15a) is provided with the feed port (22a) of the radiation zone (21a) that is printed on medium substrate front (13), the radiation zone (31a) that is printed on the medium substrate back side (12) and radiation zone (21a); Described antenna element (15b) is provided with the radiation zone (21b) that is printed on medium substrate front (13), the radiation zone (31b) that is printed on the medium substrate back side (12), and the feed port (22b) of radiation zone (21b); Described radiation zone (31a) and radiation zone (31b) all insert floor (14) and carry out short circuit;
Radiation zone (21a) has the lap (17a) that is used for providing feed to radiation zone (31a) with radiation zone (31a), radiation zone (21b) has the lap (17b) that is used for providing feed to radiation zone (31b) with radiation zone (31b), and lap (17a) constitutes the biobelt line structure with lap (17b).Biobelt line structure (17a) and effect (17b): provide effective coupling feed to radiating element (31a) with (31b) on the one hand, it has also introduced partition capacitance on the other hand, helps improving impedance matching, has increased impedance bandwidth.Energy is radiate effectively, and isolation also obtains certain raising.
The utility model has the following advantages and beneficial effect compared to existing technology:
1, compare with existing MIMO antenna array, the utility model has been introduced two kinds of structures that improve isolations.A kind ofly be used to reduce the mutual coupling that space wave causes, a kind ofly be used to reduce the mutual coupling that surface wave causes;
2, existing MIMO antenna array design mainly is devoted to reduce the mutual coupling between antenna, so their impedance bandwidth is generally all very narrow.And in the utility model, introduced the biobelt line structure, it can improve impedance bandwidth effectively.Suitably adjust the biobelt line structure, just can obtain good impedance bandwidth, satisfy the requirement of multi-functional hand-held device system;
3, compare with existing MIMO antenna array, the utility model has good robustness to being placed on its conducting element on every side, has higher stability;
4, compare with existing MIMO antenna array, the utlity model has wideer impedance bandwidth, littler size, simpler structure, thus can reduce production costs, be applicable in the various multifunctional small-size handheld devices.
Description of drawings
Fig. 1 is the two unit MIMO antenna structure views that existing U.S. Pat 7411554B2 proposes;
Fig. 2 is the structure chart of two unit wideband MIMO antenna arrays;
Fig. 3 is the front elevation of two unit wideband MIMO antenna arrays;
Fig. 4 is the back view of two unit wideband MIMO antenna arrays;
Fig. 5 is the return loss Electromagnetic Simulation and the experiment test curve comparison diagram of two unit wideband MIMO antenna arrays, and represents emulation among the figure | S
11| (| S
22|) curve, 000 expression experiment tests | S
11| curve, △ △ △ represents experiment test | S
22| curve;
Fig. 6 is the Electromagnetic Simulation and the experiment test curve comparison diagram of two unit wideband MIMO antenna array isolations, and represents emulation among the figure | S
12| (| S
21|) curve, 000 expression experiment tests | S
12| (| S
21|) curve
Fig. 7 is the positive schematic diagram of placing can (61) of the medium substrate of two unit wideband MIMO aerial arrays shown in Figure 3;
Fig. 8 is the Electromagnetic Simulation comparison diagram of Fig. 3 and two unit MIMO aerial arrays shown in Figure 8, when represents not add can among the figure | S
11| curve, 000 expressions add behind the can | S
11| curve (S=1mm), when △ △ △ represents not add can | the S21| curve, after * * * represents to add can | S
21| curve (S=1mm).
Wherein: (11) are 1-100 for relative dielectric constant, the medium substrate of thickness 0.2-5mm, (12) be the medium substrate back side, (13) be the medium substrate front, (14) for being printed on the floor of the medium substrate back side (12), (15a, 15b) be respectively the antenna element 1 and antenna element 2 of MIMO antenna, (16) be slot on the floor (14), (17a, 17b) the overlapping part of two radiation zones of antenna element (15a) and antenna element (15b) is a biobelt line structure mentioned above respectively, (21a, 21b) difference antenna element (15a) and antenna element (15b) are printed on the radiation zone of medium substrate front (13), (22a, 22b) be respectively the feed port 1 and the feed port 2 of two antenna elements, radiation zone (21a) and (21b) respectively by port (22a) and port (22b) feed, (31a, 31b) be respectively the radiation zone that antenna element (15a) and antenna element (15b) are printed on the medium substrate back side, they are respectively by the biobelt line structure (17a) and the feed that (17b) is coupled, and their terminal and floor (14) short circuit, (41) be resonance point 1650MHz, (42) be resonance point 2300MHz, (43) be resonance point 3400MHz, (44) be resonance point 4500MHz, (45) be resonance point 5200MHz, (61) be can, (62) be between the feed port of can and two antenna elements apart from S.
Embodiment
Below in conjunction with embodiment and accompanying drawing the utility model is described in further detail, but execution mode of the present utility model is not limited thereto.
Embodiment 1
Figure 2 shows that the structure of two unit MIMO antennas of the small sized wide-band that the utility model proposes, it has comprised two orthogonal antenna elements (15a and 15b).Because in theory, orthogonal antenna element is a mismatch, and they do not receive the signal from the other side, so the utility model is spent two antenna elements respectively to different direction inclinations 45, form orthogonal attitude, this helps reducing the mutual coupling that space wave brings.Floor (14) is printed on the back side (12) of medium substrate (11), and the surface wave of floor (14) can cause mutual coupling, for reduce the surperficial wavestrip in floor (14) antenna element between mutual coupling, on the floor, embedded slot (16).To floor (14) surface current/ripple, slot (16) has sunken stream effect, it most floor (14) surface current be limited in oneself around, hindered most of floor (14) surface current and flowed to another feed port, thereby reduced the mutual coupling between antenna element from a feed port.
Figure 3 shows that the front elevation of MIMO antenna, Figure 4 shows that the back view of MIMO antenna.Antenna element (15a) is formed by radiating element (21a) with (31a), and radiating element (15b) is formed by radiating element (21b) with (31b).Radiating element (21a) and (21b) be printed on the front (13) of medium substrate (11) wherein, they are respectively by feed port (22a) and (22b) direct feed.Radiating element (31a) and (31b) be printed on the back side (12) of medium substrate (11), their end and floor (14) short circuit.
Radiating element (21a) and (31a), radiating element (21b) and (31b) overlapped part constituted biobelt line structure (17a) and (17b), by biobelt line structure (17a) and (17b) give the radiating element (31a) and (31b) feed that is coupled respectively.Biobelt line structure (17a) and effect (17b): provide effective coupling feed to radiating element (31a) with (31b) on the one hand, it has introduced partition capacitance on the other hand, helps improving impedance matching.Radiating element (31a) and (31b) locate to take place resonance at frequency 2300MHz (42) and 4500MHz (44) has increased impedance bandwidth.Energy is radiate effectively, and isolation also obtains certain raising.Radiating element (21a, 21b) in frequency 1650MHz (41), 3400MHz (43) and 5200MHz (45) have produced 3 resonance points, and (31a 31b) locates to take place resonance at frequency 2300MHz (42) and 4500MHz (44) to resonant element.These 5 resonance points interact, and have formed wide impedance bandwidth as shown in Figure 6.
Size of the present utility model is very little, and reason is the stable performance of this MIMO antenna, and reducing of ground board size is little to the antenna performance influence.In order to prove the stable performance of this Unit two MIMO antenna, as shown in Figure 7, placed a can (61) in the medium substrate front of MIMO aerial array shown in Figure 2, (22a, 22b) distance between is S (62) to can (61) with two feed port.As shown in Figure 8, when S was reduced to 1mm, MIMO aerial array shown in Figure 7 was compared with the MIMO aerial array (as shown in Figure 2) of not placing can (61), and the influence that return loss and isolation are subjected to is all very little.Can learn that the MIMO aerial array has good robust property to being placed on array conducting element on every side, antenna performance is stable, and this is to the application of reality, and is extremely important.This Shen definition: | S
11|, | S
22| the mould of the return loss of difference representative antennas unit (15a) and antenna element (15b), | S
12| (| S
21|) representative antennas unit 2 (1) is to the mould of the coupling of antenna element 1 (2).| S
11|, | S
22|, | S
12|, | S
21| the general designation scattering parameter.
Embodiment: it is little that small sized wide-band two unit MIMO aerial arrays have size, and bandwidth is wide, steady performance.By adjusting the size of finedraw, can realize high-isolation.In order to improve impedance matching, the biobelt line structure is used, and by adjusting the size of biobelt line, can realize wide impedance bandwidth; Emulation of the present utility model and actual measurement response curve are as shown in Figure 5 and Figure 6.
The foregoing description is the utility model preferred implementation; but execution mode of the present utility model is not restricted to the described embodiments; other any do not deviate from change, the modification done under spirit of the present utility model and the principle, substitutes, combination, simplify; all should be the substitute mode of equivalence, be included within the protection range of the present utility model.
Claims (4)
1. two unit wideband MIMO antenna arrays, it is characterized in that: the antenna element (15a) and antenna element (15b) that comprise medium substrate (11) and MIMO antenna, wherein, described medium substrate (11) comprises the medium substrate back side (12) and medium substrate front (13), the floor is printed on the medium substrate back side (12), antenna element 115a) vertical mutually in opposite direction with antenna element (15b), be embedded with slot (16) on described floor (14).
2. two unit wideband MIMO antenna arrays according to claim 1 is characterized in that: it is 1-100 that described medium substrate (11) adopts relative dielectric constant, the medium substrate of thickness 0.2-5mm.
3. two unit wideband MIMO antenna arrays according to claim 1 is characterized in that: described antenna element (15a) and antenna element (15b) 45 degree that tilt in opposite direction.
4. two unit wideband MIMO antenna arrays according to claim 1 is characterized in that: described antenna element (15a) is provided with the feed port (22a) of the radiation zone (21a) that is printed on medium substrate front (13), the radiation zone (31a) that is printed on the medium substrate back side (12) and radiation zone (21a); Described antenna element (15b) is provided with the radiation zone (21b) that is printed on medium substrate front (13), the radiation zone (31b) that is printed on the medium substrate back side (12), and the feed port (22b) of radiation zone (21b); Described radiation zone (31a) and radiation zone (31b) all insert floor (14);
Radiation zone (21a) and radiation zone (31a) are formed for providing the lap (17a) of coupling feed to radiation zone (31a), radiation zone (21b) and radiation zone (31b) are formed for providing the lap (17b) of coupling feed to radiation zone (31b), and lap (17a) promptly is above-mentioned biobelt line structure with lap (17b).
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| CN102544729A (en) * | 2012-01-18 | 2012-07-04 | 华南理工大学 | MIMO antenna utilizing closed current circuit in antenna unit to improve isolation degree |
| CN102810735A (en) * | 2011-05-31 | 2012-12-05 | 深圳光启高等理工研究院 | Antenna and MIMO (multiple input multiple output) antenna with same |
| CN103094672A (en) * | 2011-10-28 | 2013-05-08 | 鸿富锦精密工业（深圳）有限公司 | Antenna |
| EP2618422A1 (en) * | 2012-01-20 | 2013-07-24 | Thomson Licensing | Improvement in the isolation of antennas mounted on a printed circuit board |
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| CN104157987A (en) * | 2014-06-13 | 2014-11-19 | 电子科技大学 | Miniature MIMO (Multiple Input Multiple Output) ultra-wideband antenna |
| WO2014194575A1 (en) * | 2013-06-03 | 2014-12-11 | 中兴通讯股份有限公司 | Printed circuit board and wireless terminal using multiple-input multiple-output antenna technology |
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| CN103094672B (en) * | 2011-10-28 | 2015-03-11 | 鸿富锦精密工业（深圳）有限公司 | Antenna |
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| CN102544729B (en) * | 2012-01-18 | 2014-04-02 | 华南理工大学 | MIMO antenna utilizing closed current circuit in antenna unit to improve isolation degree |
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| CN106972238A (en) * | 2017-04-30 | 2017-07-21 | 电子科技大学 | A kind of plane mutli-system integration antenna for mobile terminal |
| CN107275782A (en) * | 2017-05-19 | 2017-10-20 | 上海斐讯数据通信技术有限公司 | A kind of mimo antenna and its device |
| WO2020140537A1 (en) * | 2018-12-30 | 2020-07-09 | 瑞声声学科技(深圳)有限公司 | Mimo antenna system and electronic equipment |
| CN111969312A (en) * | 2020-08-14 | 2020-11-20 | 中国人民解放军空军工程大学 | Antenna array |
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