CN102842756B - Dual-polarization MIMO (Multiple Input Multiple Output) antenna array - Google Patents
Dual-polarization MIMO (Multiple Input Multiple Output) antenna array Download PDFInfo
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- CN102842756B CN102842756B CN201210357693.0A CN201210357693A CN102842756B CN 102842756 B CN102842756 B CN 102842756B CN 201210357693 A CN201210357693 A CN 201210357693A CN 102842756 B CN102842756 B CN 102842756B
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Abstract
The invention relates to a dual-polarization MIMO (Multiple Input Multiple Output) antenna array comprising two same dual-polarization antenna units. Each antenna unit is as follows: a first square dielectric slab, a second dielectric slab and a grounding plate are overlapped and stacked, a metal radiation patch is arranged on the upper surface of each antenna unit, two micro-strip feeder lines vertical to each other are arranged between the two dielectric plate and are respectively positioned on a middle of two adjacent sides of a square. The two antenna units are arranged on the same horizontal plane, the two opposite sides of the square of one antenna unit and the corresponding sides of the other square are arranged on the same straight line, namely, the squares of the two antenna units are positioned on the two sides of the same rectangle. The distance between the adjacent sides of the squares of the two antenna units is 0.1-100mm. The two antenna units are separated by air or insulated plastic foam. Convex rectangles are formed on the four sides of the metal radiation paster. Symmetrical cross-shaped slots are arranged on the grounding plate. According to the dual-polarization MIMO antenna array, the high performance of the antenna array is ensured, the miniaturization and the high-radiation performance are realized, the impedance bandwidth is improved, and the distance between the antenna units is adjusted, namely, the isolation is adjusted.
Description
Technical field
The present invention relates to antenna technical field, be specifically related to a kind of dual polarization mimo antenna battle array having two antenna elements.
Background technology
Along with radio communication is at a high speed to wideband multifunction future development, the not enough problem of frequency spectrum resource becomes increasingly conspicuous.How fully to develop limited spectrum resources and to improve the availability of frequency spectrum, be the hot subject of present communications circle research.In order to improve the availability of frequency spectrum on limited frequency band, realizing the transfer of data of higher rate, having occurred MIMO technology, i.e. MIMO technique.MIMO technology all adopts many antennas to receive and dispatch at transmitting terminal and receiving terminal, increases exponentially capacity and the availability of frequency spectrum of communication system when not increasing system bandwidth, also can improve the reliability of channel simultaneously, reduce its error rate.Adopt MIMO technology greatly can improve capacity and the availability of frequency spectrum of communication system, also can improve the reliability of channel simultaneously, reduce the error rate, it is the key technology of (rear 3G or 4G) mobile communication of future generation, is regarded as one of the most competitive technology in following radio communication.Along with developing rapidly of MIMO technology, start now to be applied to wireless lan (wlan) with improving performance, the small-sized MIMO technology that research is applicable to WLAN has theory significance and practical value simultaneously.
Mimo antenna design is one of three large key technologies of the MIMO communication technology.
Be subject to the restriction of receiver or transmitter size and structure, need to arrange antenna element as much as possible in limited space, requirements at the higher level are proposed to antenna element and antenna array design.Because the factors such as the number of the design of antenna element, array element, array structure and arrangement mode directly affect the spatial coherence of mimo channel.Especially portable terminal antenna for number of antennas and status requirement higher; As mobile phone is particularly strict to its number of antennas and pitch requirements, one: its antenna element separation is comparatively large, must have diversity feature; Its two: each antenna element will receive the scattered wave of next each side as far as possible, and these 2 conventional diversity antennas all cannot realize.
Problem in the urgent need to address is: in limited space, make each antenna element in array have less correlation, makes the corresponding matrix of mimo channel close to full rank, and obtains mimo system heap(ed) capacity.Be some problems that antenna applications faces in Practical Project in addition, such as antenna-coupled, polarization isolation, conformal and body are on the impact etc. of antenna performance.
For base station, because free space is large, the application of multi-antenna technology is easily accomplished, existing multiple solution.But mimo antenna design in mobile terminal remains the bottleneck of MIMO technical development and application, even can say that the development of antenna governs future wireless system development.Because mimo system adopts multi-antenna technology at transmitting-receiving two-end, must cause increasing more RF processing unit number at transmitting-receiving two-end, the cost of radio-frequency module is generally relatively costly, and this is obviously unfavorable for the commercialization of MIMO technology.802.11n route and network interface card price are also relatively high in addition, therefore up to the present, MIMO technology also seldom realizes in business-like cell mobile communication systems, and the application in 3G is restricted, and does not also cover on a large scale in WLAN (wireless local area network) 802.11n network.
On individual mobile communication terminal, in especially various small hand held devices, often do not allow to place too many antenna.Require that antenna structure is more compact, be convenient to and integration of equipments, require that the combination of each antenna element can fully effectively utilize space-multipath resource simultaneously.
Be applicable at present directly be integrated in the antenna on mobile terminal, external antenna has 1/4 wave monopole, helical antenna etc.; Built-in antenna has micro-strip paster antenna, microstrip slot antenna, planar inverted-F antenna (PIFA) etc.Micro-strip paster antenna with floor has good conformal, low section, comparatively ideal gain and less SAR, is the first-selection of mimo antenna unit form always, is commonly used to portable wireless apparatus.
Multiple antenna need be integrated in little space by handheld device, can cause very large mutual coupling, and the diversity performance of antenna just declines thereupon.The coupling how reduced between antenna element is the difficult point of mimo antenna design, and current conventional method on floor, cuts out finedraw, adopts EBG floor panel structure, adds reflector element and increase floor branch etc.But number of antennas integrated is in a limited space more, obtain impedance bandwidth will be more difficult.In order to the performance improving mimo antenna increases antenna element number, although a certain performance of the mimo antenna obtained is very excellent, take up room large, the isolation of antenna array is low, and bandwidth is all narrow.Miniaturized multi-functional mobile terminal equipment cannot be met.Existing floor multiple unit mimo antenna structure, although individual antenna cell impedance bandwidth is very wide, after all unit being integrated into the mimo antenna battle array of multi-antenna-unit, due to the mutual coupling between each antenna element, antenna element impedance is deteriorated.
Also be not applicable to the high-performance mimo antenna of radio communication mobile terminal in a word at present.
Summary of the invention
The object of the invention is to design a kind of dual polarization mimo antenna battle array, comprise 2 identical dual polarized antenna units, volume is little, high-gain, and cost is low, easy of integration, and the mobile terminal being suitable for radio communication uses.
The dual polarization mimo antenna battle array that the present invention designs comprises 2 identical dual polarized antenna units, each dual polarized antenna unit is stacked square, comprise the ground plate of metal radiation paster, microstrip feed line, ground floor dielectric-slab, second layer dielectric-slab and conduction, ground floor dielectric-slab, second layer dielectric-slab and ground plate are identical square, ground floor dielectric-slab is second layer dielectric-slab in the superiors, its time, ground plate is at bottom, three ply board four limit overlaps stacked, and each layer is bonded to each other, be fixedly connected with.Ground floor dielectric-slab upper surface is metal radiation paster, forms radiating element.Metal radiation paster is also square, and the length of side is less than the length of side of ground floor dielectric-slab, is positioned at the center of ground floor dielectric-slab.Between ground floor dielectric-slab and second layer dielectric-slab, arrange orthogonal 2 microstrip feed lines, 2 microstrip feed lines lay respectively on the center line on square adjacent both sides; 2 dual polarized antenna units are placed in same level, and foursquare 2 opposite side of wherein 1 dual polarized antenna unit foursquare corresponding sides are on same straight line with another respectively, namely the square of 2 dual polarized antenna units is in same rectangular two ends, and this rectangle length of short sides equals the dual polarized antenna unit square length of side.2 dual polarized antenna unit placement directions are not limit, and the microstrip feed line of each dual polarized antenna unit can be in adjacent any 2 limits of the square of this dual polarized antenna unit.
The square length of side of the ground floor dielectric-slab of described dual polarized antenna unit is S, S is 42mm ~ 60mm.
Distance L between 2 square adjacent limits of dual polarized antenna unit is 0.1mm ~ 100mm.Regulate the isolation of L and adjustable antenna array.
Be separated by with air or ambroin foam between 2 dual polarized antenna units.Be conducive to the mutual coupling reducing to cause because of space wave, be conducive to reducing or avoiding 2 dual polarized antenna units coupling influence each other.
The length of side W of described metal radiation paster is 3/10 to 3/5 of S.
Described 2 microstrip feed lines respectively connect feed port in the edge of second layer dielectric-slab, and the length N of microstrip feed line is 1/4 to 4/9 of S, and width n is 1/10 to 1/5 of S.Adjustment microstrip feed line length, can adjust the notch depth of this antenna.Feed line length is directly proportional to notch depth.
There is identical protrusion rectangle on four limits of described metal radiation paster, protrude rectangle with the center line on limit, place for symmetry, namely four limits are the identical broken line as " convex " word first half, and the special shape of metal radiation paster has expanded band bandwidth, and make antenna obviously miniaturized.The symmetrical structure of described metal radiation paster ensures the interport isolation that antenna is higher and lower cross polarization level, and improves the beamwidth of antenna to a certain extent.
The length M of four limits protrusion rectangles of described metal radiation paster is 2/5 to 4/5 of the length of side W of metal radiation paster, and width m is 1/10 to 1/5 of (1/2) * (S-W).
Described ground plate take center as the origin of coordinates, the cross bath of a penetrating ground plate is respectively had in four quadrant areas, the vertical transverse groove of cross bath is parallel with the limit of ground plate or vertical, and cannelure is equal with the length and width of transverse groove, 4 cross baths with ground plate center for symmetrical centre.
The vertical or horizontal length D of described cross bath is 1/5 to 2/5 of S, and the distance d at the distance ground plate edge, outer end of groove is 1/10 to 1/5 of D, and the width s of groove is 1/10 to 1/5 of D.
The ground floor dielectric-slab of described dual polarized antenna unit is DIELECTRIC CONSTANT ε
rbe the single-side coated copper plate of 4.1 ~ 4.7, metal radiation paster is remaining copper clad layers after ground floor dielectric-slab etching; Second layer dielectric-slab is DIELECTRIC CONSTANT ε
rbe the double face copper of 4.1 ~ 4.7, microstrip feed line is remaining copper clad layers after second layer dielectric-slab surface etch, and ground plate is the bottom surface copper clad layers of second layer dielectric-slab.
The feed port welding microwave high-frequency connector of each microstrip feed line of described dual polarized antenna unit, i.e. SMA(Small A Type) joint.
Compared with prior art, dual polarization mimo antenna battle array of the present invention has following advantage and beneficial effect: 1, select two antenna elements, under guarantee mimo antenna battle array has high performance prerequisite, achieves the characteristics such as the miniaturization of antenna array and high radiance; 2, keep antenna element bandwidth not diminish, improve the impedance bandwidth of mimo antenna battle array, suitably adjust antenna element separation from, multifunctional terminal device impedance bandwidth can be met and require and good isolation; 3, structure is simpler, and adopts planar alignment, is integrated into easily on circuit board, is more suitable for being integrated in the equipment of mobile terminal than the mimo antenna battle array of three-dimensional structure; Have more miniaturized advantage, production cost also reduces greatly; 4, two antenna elements form the terminal mimo antenna structure of two antenna arrangement diversity forms; Two pieces of quadrant antenna unit respectively have wider antenna pattern, be beneficial to the space diversity improving mimo antenna, rectangular profile arrangement is adopted then to improve the polarization diversity effect of antenna, bottom 2 antenna elements cover copper ground plate separated by a distance, be divided into independently two parts, isolation improve with antenna element between mutual coupling reduce; Ensure, between each feed port, there is higher isolation, greatly can improve the receptivity of system; 5, the structure of the parallel placement of dual polarized antenna unit, feed port has impedance matching well, when very little on the isolation impact between 2 antenna elements, significantly improve the impedance matching of antenna array, antenna element farthest retains original impedance bandwidth, mimo antenna battle array in undersized situation, can obtain desirable impedance bandwidth; 7, experimental result shows the frequency place that antenna resonance is being expected, and has desirable mutual coupling, and the error in experiment between measured value and theoretical value is in allowable range.
Accompanying drawing explanation
Fig. 1 is this dual polarization mimo antenna battle array embodiment 1 Facad structure schematic diagram;
Fig. 2 is this dual polarization mimo antenna battle array embodiment 1 inverse layer structure schematic diagram;
Fig. 3 is this dual polarization mimo antenna battle array embodiment 1 side structure schematic diagram;
Fig. 4 is the return loss plot figure of the feed port of one of them microstrip feed line of this dual polarization mimo antenna battle array embodiment 1;
Fig. 5 is the standing-wave ratio curve chart of the feed port of one of them microstrip feed line of this dual polarization mimo antenna battle array embodiment 1;
Fig. 6 is the gain curve figure of this dual polarization mimo antenna battle array embodiment 1 at azimuth theta=0 ~ 360deg;
Fig. 7 is this dual polarization mimo antenna battle array embodiment 2 Facad structure schematic diagram;
Fig. 8 is this dual polarization mimo antenna battle array embodiment 3 Facad structure schematic diagram;
Fig. 9 is this dual polarization mimo antenna battle array embodiment 4 Facad structure schematic diagram;
Figure 10 is this dual polarization mimo antenna battle array embodiment 5 Facad structure schematic diagram;
Figure 11 is this dual polarization mimo antenna battle array embodiment 6 Facad structure schematic diagram.
Figure internal label is: A, a dual polarized antenna unit, B, another dual polarized antenna unit;
1, ground floor dielectric-slab, 2, metal radiation paster, 21, protrude rectangle, 3, microstrip feed line, 31, feed port, 4, ground plate, 41, cross bath, 5, second layer dielectric-slab.
Embodiment
Embodiment 1
This dual polarization mimo antenna battle array embodiment as shown in Figures 1 to 3, comprise in 2 identical dual polarized antenna unit A and B(figure rising with dotted line frame and represent an antenna element), each dual polarized antenna unit A or B is stacked square, 2 dual polarized antenna unit A and B are placed in same level, and wherein foursquare 2 opposite side of 1 dual polarized antenna unit A are on same straight line with the foursquare corresponding sides of another dual polarized antenna unit B respectively, namely the square of 2 dual polarized antenna unit A is in same rectangular two ends, this rectangle length of short sides equals the dual polarized antenna unit square length of side.Distance L between the limit that this example 2 dual polarized antenna unit squares are adjacent is 5mm.Two dual polarized antenna unit A are identical with B placement direction for this example, namely as shown in Figure 1, the microstrip feed line 3 of B and A be one on its square left side, another at its square below.
Be separated by with ambroin foam between this example 2 dual polarized antenna unit A and B.
Described dual polarized antenna unit A is identical with B structure, includes ground floor dielectric-slab 1, second layer dielectric-slab 5 and ground plate 4.The square of this routine ground floor dielectric-slab 1, second layer dielectric-slab 5 and ground plate 4 to be the identical length of side be S=51 millimeter, ground floor dielectric-slab 1 is second layer dielectric-slab 5 in the superiors, its time, ground plate 4 is at bottom, and three ply board four limit overlaps stacked, and each layer is bonded to each other.
The ground floor dielectric-slab 1 of this example is DIELECTRIC CONSTANT ε
rbe 4.4, tangent loss angle tan σ is 0.02, thickness is the single-side coated copper plate of 2 millimeters, and metal radiation paster 2 etches rear remaining copper clad layers for ground floor dielectric-slab 1, and second layer dielectric-slab 5 is DIELECTRIC CONSTANT ε
rbe 4.4, tangent loss angle tan σ is 0.02, thickness is the double face copper of 2 millimeters, and microstrip feed line 3 is remaining copper clad layers after second layer dielectric-slab 5 upper surface etching, and ground plate 4 is the bottom surface copper clad layers of second layer dielectric-slab 5.This routine ground floor dielectric-slab 1 and second layer dielectric-slab 5 bonding connection.Also 2 layers of dielectric-slab can be connected with plastic screw.
As shown in Figure 1, this routine described metal radiation paster 2 is the square of length of side W=23.6 millimeter, is positioned at the center of ground floor dielectric-slab 1.There is identical protrusion rectangle 21 on square four limits, and protrude rectangle 21 with the center line on limit, place for symmetry, this example protrudes the length M=14.0 millimeter of rectangle 21, width m=2.0 millimeter.
Orthogonal 2 microstrip feed lines 3 lay respectively on the center line on the adjacent both sides of second layer dielectric-slab 5 upper surface square, length N=17.3 millimeter, width n=3.2 millimeter.2 microstrip feed lines 3 respectively connect the sub-miniature A connector of 50 ohm as feed port 31 in the outer end of the edge of second layer dielectric-slab 5.The width of adjustment microstrip feed line 3 makes the sub-miniature A connector of feed port and 50 ohm match.
As shown in Figure 2, described ground plate 4 take center as the origin of coordinates, the cross bath 41 of a penetrating ground plate 4 is respectively had in four quadrant areas, the vertical transverse groove of cross bath 41 is parallel with the limit of ground plate 4 or vertical, and cannelure is equal with the length and width of transverse groove, 4 cross baths 41 with ground plate 4 center for symmetry.The vertical or horizontal length D=15.6 millimeter of cross bath 41, width s=2.6 millimeter, the distance d=2.2 millimeter at distance ground plate 4 edge, outer end of groove.
This routine mimo antenna battle array adopts 50 ohm microstrip feeds, and viewed from measured value, between each port, separation number is all greater than 25dB, has high isolation between the port that this routine mimo antenna battle array two antenna elements are described.The special instrument such as network vector analyzer are used to measure radiation characteristics such as its return loss, standing-wave ratio, gain, directional diagrams.Measured result is as shown in figures 4-6.Fig. 4 is the return loss value of one of them feed port signal input, illustrated abscissa is frequency F, ordinate is return loss S11 value, from figure known routine mimo antenna battle array resonance at 2.43GHz, now S11 is about-27dB, return loss S11≤-10dB between 2.3GHz ~ 2.52GHz, antenna array passband is wide up to 220MHz, relative bandwidth reaches 9% more than, and single dual polarized antenna unit original tape wide be 230MHz, before comparing group battle array, beamwidth of antenna change is little.Figure 5 shows that the standing-wave ratio curve of a feed port in antenna array, abscissa is frequency F, and ordinate is the voltage standing wave ratio VSWR of antenna array, as can be seen from Figure 5: voltage standing wave ratio VSWR≤2 of this routine antenna array between 2.3GHz ~ 2.52GHz; VSWR≤1.5 between 2.36GHz ~ 2.49GHz, completely covers WLAN2.4GHz frequency range (2.4 ~ 2.48GHz), illustrate that this routine antenna array has wide passband, and traditional antenna battle array bandwidth only about 100MHz.Figure 6 shows that the gain curve of the present embodiment at azimuth theta=0 ~ 360deg, its abscissa is azimuth, and ordinate is yield value, and this routine array gain peak value is up to 6.5dBi as can be seen from Figure 6, has high-gain performance.Illustrate that the layout of this routine mimo antenna battle array is more satisfactory from above real side interpretation of result, excellent performance.
Embodiment 2
It is substantially the same manner as Example 1 that this dual polarization mimo antenna battle array implements structure, this example two dual polarized antenna unit A, B placement directions as shown in Figure 7, the microstrip feed line 3 one of A on its square left side, another at its square below, the microstrip feed line 3 one of B on its square the right, another at its square below.
Embodiment 3
This dual polarization mimo antenna battle array example structure is substantially the same manner as Example 1, this example two dual polarized antenna unit A, B placement directions as shown in Figure 8, the microstrip feed line 3 one of A on its square left side, another at its square below, the microstrip feed line 3 one of B on its square the right, another is in its square top.
Embodiment 4
This dual polarization mimo antenna battle array example structure is substantially the same manner as Example 1, this example two dual polarized antenna unit A, B placement directions as shown in Figure 9, the microstrip feed line 3 one of A on its square left side, another at its square below, the microstrip feed line 3 one of B on its square left side, another is in its square top.
Embodiment 5
This dual polarization mimo antenna battle array example structure is substantially the same manner as Example 1, this example two dual polarized antenna unit A, B placement directions as shown in Figure 10, the microstrip feed line 3 one of A on its square the right, another at its square below, the microstrip feed line 3 one of B on its square left side, another at its square below.
Embodiment 6
This dual polarization mimo antenna battle array example structure is substantially the same manner as Example 1, this example two dual polarized antenna unit A, B placement directions as shown in figure 11, the microstrip feed line 3 one of A on its square the right, another at its square below, the microstrip feed line 3 one of B on its square left side, another is in its square top.
Above-described embodiment, be only the specific case further described object of the present invention, technical scheme and beneficial effect, the present invention is not defined in this.All make within scope of disclosure of the present invention any amendment, equivalent replacement, improvement etc., be all included within protection scope of the present invention.
Claims (9)
1. dual polarization mimo antenna battle array, is characterized in that:
Comprise 2 identical dual polarized antenna units, each dual polarized antenna unit is stacked square, comprise metal radiation paster (2), microstrip feed line (3), ground floor dielectric-slab (1), the ground plate (4) of second layer dielectric-slab (5) and conduction, ground floor dielectric-slab (1), second layer dielectric-slab (5) and ground plate (4) are identical square, ground floor dielectric-slab (1) is in the superiors, it is lower is second layer dielectric-slab (5), ground plate (4) is at bottom, three ply board four limit overlaps stacked, each layer is bonded to each other, be fixedly connected with, ground floor dielectric-slab (1) upper surface is metal radiation paster (2), forms radiating element, metal radiation paster (2) is also square, and the length of side is less than the length of side of ground floor dielectric-slab (1), and metal radiation paster (2) is positioned at the center of ground floor dielectric-slab (1), between ground floor dielectric-slab (1) and second layer dielectric-slab (5), arrange orthogonal 2 microstrip feed lines (3), 2 microstrip feed lines (3) lay respectively on the center line on the adjacent both sides of square of second layer dielectric-slab (5) upper surface, 2 dual polarized antenna units are placed in same level, and foursquare 2 opposite side of wherein 1 dual polarized antenna unit foursquare corresponding sides are on same straight line with another respectively, namely the square of 2 dual polarized antenna units is in same rectangular two ends, and this rectangle length of short sides equals the dual polarized antenna unit square length of side,
Described ground plate (4) take center as the origin of coordinates, the cross bath (41) of a penetrating ground plate is respectively had in four quadrant areas, the vertical transverse groove of cross bath (41) is parallel or vertical with the limit of ground plate (4), and cannelure is equal with the length and width of transverse groove, 4 cross baths (41) with ground plate (4) center for symmetrical centre.
2. dual polarization mimo antenna battle array according to claim 1, is characterized in that:
The square length of side of the ground floor dielectric-slab (1) of described dual polarized antenna unit is S, S is 42mm ~ 60mm.
3. dual polarization mimo antenna battle array according to claim 2, is characterized in that:
Distance L between the limit that described 2 dual polarized antenna units square is adjacent is 0.1mm ~ 100mm, is separated by between 2 dual polarized antenna units with air or ambroin foam.
4. dual polarization mimo antenna battle array according to claim 2, is characterized in that:
The length of side W of described metal radiation paster (2) is 3/10 to 3/5 of S.
5. dual polarization mimo antenna battle array according to claim 2, is characterized in that:
Described 2 microstrip feed lines (3) respectively connect feed port in the edge of second layer dielectric-slab, and the length N of microstrip feed line (3) is 1/4 to 4/9 of S, and width n is 1/10 to 1/5 of S.
6. dual polarization mimo antenna battle array according to claim 2, is characterized in that:
There is identical protrusion rectangle (21) on four limits of described metal radiation paster (2), protrude rectangle (21) with the center line on limit, place for symmetry.
7. dual polarization mimo antenna battle array according to claim 6, is characterized in that:
The length M on four limits protrusion rectangle (21) of described metal radiation paster (2) is 2/5 to 4/5, width m of the length of side W of metal radiation paster (2) is 1/10 to 1/5 of (1/2) * (S-W).
8. dual polarization mimo antenna battle array according to claim 2, is characterized in that:
The vertical or horizontal length D of described cross bath (41) is 1/5 to 2/5 of S, and the distance d at distance ground plate (4) edge, outer end of groove is 1/10 to 1/5 of D, and the width s of groove is 1/10 to 1/5 of D.
9. dual polarization mimo antenna battle array according to any one of claim 1 to 3, is characterized in that:
The ground floor dielectric-slab (1) of described dual polarized antenna unit is DIELECTRIC CONSTANT ε
rbe the single-side coated copper plate of 4.1 ~ 4.7, metal radiation paster (2) is remaining copper clad layers after ground floor dielectric-slab (1) etching; Second layer dielectric-slab (5) is DIELECTRIC CONSTANT ε
rbe the double face copper of 4.1 ~ 4.7, microstrip feed line (3) is remaining copper clad layers after second layer dielectric-slab (5) surface etch, and ground plate (4) is the copper clad layers of second layer dielectric-slab (5) bottom surface.
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| CN104157982A (en) * | 2014-07-07 | 2014-11-19 | 华东交通大学 | Dual-polarized MIMO antenna based on EBG structure |
| CN107925165B (en) * | 2015-10-26 | 2020-08-21 | 阿莫技术有限公司 | Multi-band patch antenna module |
| CN105680177B (en) * | 2016-01-22 | 2018-04-06 | 西北工业大学 | T-type structure feed double frequency is applied to WLAN two unit planar microstrip mimo antennas |
| BR112019013579A2 (en) * | 2017-01-12 | 2020-01-07 | Telefonaktiebolaget Lm Ericsson (Publ) | WIRELESS DEVICE, METHOD AND COMPUTER PROGRAM FOR BEAM FORMATION WITH DUAL POLARIZATION, AND COMPUTER PROGRAM PRODUCT. |
| CN113366704B (en) * | 2019-01-31 | 2023-08-01 | 株式会社村田制作所 | Planar antenna, planar array antenna, multi-axis array antenna, wireless communication module, and wireless communication device |
| CN112448163A (en) * | 2019-08-10 | 2021-03-05 | 深圳市卓睿通信技术有限公司 | High-isolation antenna pair and MIMO antenna system |
| CN111430881B (en) * | 2020-03-31 | 2022-04-22 | 联想(北京)有限公司 | Electronic equipment |
| CN112290227B (en) * | 2020-10-29 | 2022-05-20 | 上海大学 | Dual-frequency dual-circularly-polarized antenna array |
| CN112928473B (en) * | 2021-02-01 | 2022-06-24 | 重庆邮电大学 | MIMO array antenna and processing method thereof |
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