CN104638365A - Four-unit broadband slot MIMO (Multiple Input Multiple Output) antenna without decoupling structure - Google Patents
Four-unit broadband slot MIMO (Multiple Input Multiple Output) antenna without decoupling structure Download PDFInfo
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- CN104638365A CN104638365A CN201410828725.XA CN201410828725A CN104638365A CN 104638365 A CN104638365 A CN 104638365A CN 201410828725 A CN201410828725 A CN 201410828725A CN 104638365 A CN104638365 A CN 104638365A
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Abstract
The invention discloses a four-broadband slot MIMO (Multiple Input Multiple Output) antenna without a decoupling structure, which comprises a dielectric substrate and first, second, third and fourth antenna units, wherein the dielectric substrate comprises a dielectric substrate front side and a dielectric substrate reverse side; a floor is printed at the dielectric substrate reverse side; four antenna units are of the same structure; the four antenna units respectively comprise first, second, third and fourth slot units printed on the floor and first, second, third and fourth microstrip feeders printed at the dielectric substrate front side; the four microstrip feeders respectively feed electricity to the corresponding slot units by first, second, third and fourth excitation ports at one end; metal through holes are respectively formed in the other ends of the microstrip feeders; the floor is in a square shape; the four slot units are respectively arranged at four edges of the square floor and the adjacent slot units are vertical mutually; short edges of the opposite slot units are opposite. Any decoupling mechanism is not introduced into the MIMO antenna, but the MIMO antenna also can have the characteristic of high isolation.
Description
Technical field
The present invention relates to mimo antenna field, more specifically, relate to the small-sized four unit broad-band slot mimo antenna of a kind of high-isolation without decoupling arrangements.
Background technology
Over the last couple of decades, mobile communication technology and mobile communication business achieve huge progress.Nowadays forth generation mobile communication system puts it into commercial operation, as LTE-Advanced system and WirelessMAN-Advanced system.Wherein the upstream rate of LTE-Advance system can reach 500Mbps, and downstream rate can reach 1Gbps.Although forth generation mobile communication system (4G) significantly improves the quality of mobile communication airlink compared to 3-G (Generation Three mobile communication system) (3G), thus make operator can improve the quality of original communication service.But growing along with mobile subscriber's quantity and demand, and the available frequency resource of mobile communication system is very limited at present.This present situation has expedited the emergence of the communications field to new technology---the MIMO(Multiple-Input-Multiple-Output that more effectively can utilize frequency spectrum resource) invention of technology and research.
MIMO technology is for having obvious advantage close to the physical restriction even breaking through wireless transmission channel as far as possible: one is that former data flow is divided into N sub-data stream transmitted in parallel, improves the transmission rate of data; Two is that former data flow is divided into N sub-data stream transmitted in parallel, for receiver provides more independent sample, improves signal to noise ratio.Nowadays, MIMO technology has been regarded as the core technology of forth generation mobile communication technology, even also occupies and important position in the 5th third-generation mobile communication technology in future.The design of mimo antenna fundamentally can realize the factor of quality by influential system, and the mimo antenna that therefore performance is good has great engineer applied to be worth.
Along with mobile communication terminal is gradually to miniaturized and complanation development, most of communication equipment all requires that antenna is keeping under the state that can obtain performance now, and size is little as much as possible.But along with the reduction of antenna size, the coupling between antenna element can strengthen widely.This can cause the correlation between antenna element to increase widely, and the channel capacity of result MIMO communication system also decreases naturally.The mimo antenna reported at present all adopts introduces decoupling arrangements to reach the object of decoupling.But after introducing decoupling arrangements, one is that operating characteristic such as the bandwidth sum directional diagram etc. of antenna can change because of the change of antenna structure; Two be antenna size can because decoupling arrangements introducing and increase.In addition, current most of mimo antenna is all two-element antenna array, and the four unit mimo antenna that number has seldom been reported all also exist narrow bandwidth, the uncontrollable problem of bandwidth.
Summary of the invention
In order to overcome above-mentioned the deficiencies in the prior art, the present invention proposes the small-sized four unit broad-band slot mimo antenna of a kind of high-isolation without decoupling arrangements.Do not introduce any decoupling mechanism in this mimo antenna, mimo antenna can be made equally to have the characteristic of high-isolation.
To achieve these goals, technical scheme of the present invention is:
Without four unit broad-band slot mimo antenna of decoupling arrangements, comprise medium substrate, the first antenna element, the second antenna element, third antenna unit, the 4th antenna element; Wherein said medium substrate comprises medium substrate front and the medium substrate back side, and floor is printed on the medium substrate back side, and the first antenna element, the second antenna element, third antenna unit, the 4th antenna unit structure are identical;
Described first antenna element, the second antenna element, third antenna unit, the 4th antenna element include the first slot element be printed on floor, the second slot element, the 3rd slot element and the 4th slot element respectively, and are printed on first microstrip feed line in medium substrate front, the second microstrip feed line, the 3rd microstrip feed line and the 4th microstrip feed line; First microstrip feed line, the second microstrip feed line, the 3rd microstrip feed line and the 4th microstrip feed line are corresponding slot element feed respectively by first excitation port of one end, the second excitation port, the 3rd excitation port, the 4th excitation port; The other end of the first microstrip feed line, the second microstrip feed line, the 3rd microstrip feed line and the 4th microstrip feed line offers promising metallic vias respectively;
Described floor is square floor, and described first slot element, the second slot element, the 3rd slot element and the 4th slot element are separately positioned on four limits on square floor, and adjacent slot element is orthogonal, and relative slot element minor face is relative.
Preferably, described first microstrip feed line, the second microstrip feed line, the 3rd microstrip feed line and the 4th microstrip feed line are set to L-type, the excitation port in four antenna elements are separately positioned on four limits of medium substrate.
Preferably, load with corresponding microstrip feed line with the first wide short circuit minor matters, the second short circuit minor matters, the 3rd short circuit minor matters and the 4th short circuit minor matters on the metallic vias end of the first microstrip feed line, the second microstrip feed line, the 3rd microstrip feed line and the 4th microstrip feed line respectively, and the other end of short circuit minor matters offers the first corresponding metallic vias, the second metallic vias, the 3rd metallic vias and the 4th metallic vias, makes micro-band minor matters realize the circuit characteristic of short circuit.
Preferably, described first short circuit minor matters, the second short circuit minor matters, the 3rd short circuit minor matters and the 4th short circuit minor matters are L-type, the metallic vias of correspondence are separately positioned on four limits of medium substrate.
Preferably, described substrate media adopts relative medium electric constant to be 1-100, and thickness is the medium substrate of 0.2-5mm.
Compared with prior art, tool of the present invention has the following advantages: a kind of four unit broad-band slot mimo antenna without decoupling arrangements that the present invention proposes, and overcomes existing mimo antenna and necessarily improves the problem of antenna element interval from degree by introducing decoupling arrangements; Be a kind of structure simple, be easy to the four unit interstices mimo antenna of processing, the method adopting short circuit minor matters to load can the bandwidth of effective broadening antenna, and it is independently controlled to realize bandwidth; The present invention effectively overcomes existing four unit mimo antenna cannot realize the controlled difficult problem of small size, high-isolation, wide bandwidth and bandwidth simultaneously.
Accompanying drawing explanation
Fig. 1 is the structural representation of the slot antenna element not loading short circuit minor matters.
Fig. 2 is the structural representation of the slot antenna element of loading short circuit minor matters involved in the present invention.
Fig. 3 is the Electromagnetic Simulation curve adopting Fig. 1, frequency response corresponding to 2 slot antenna element.
Fig. 4 is the structural representation of the small-sized four unit broad-band slot mimo antenna of a kind of high-isolation without decoupling arrangements involved in the present invention.
Fig. 5 is the small-sized four unit broad-band slot mimo antenna of a kind of high-isolation without decoupling arrangements related in Fig. 4 | S
11|, | S
22|, | S
33| with | S
44| the Electromagnetic Simulation curve chart of frequency response.
Fig. 6 is the small-sized four unit broad-band slot mimo antenna of a kind of high-isolation without decoupling arrangements related in Fig. 4 | S
21|, | S
31|, | S
41| the Electromagnetic Simulation curve chart of frequency response.
Embodiment
Below in conjunction with accompanying drawing, the present invention will be further described, but embodiments of the present invention are not limited to this.
In Fig. 1 to 3: 11-medium substrate, the front of 12-medium substrate, the back side of 13-medium substrate, 14-is printed on the floor at the medium substrate back side, 15-is printed on the gap on floor, 16-metallic vias, and 17-is printed on 50 Ohm microstrip feeding line in medium substrate front, the excitation port of 18-slot antenna element, 19-short circuit minor matters.110-does not load the resonance frequency of the basic mode of the slot antenna element of short circuit minor matters, and 111-loads the newly-increased resonance frequency of the slot antenna element of short circuit minor matters.
In Fig. 4: 11-medium substrate, the front of 12-medium substrate, the back side of 13-medium substrate, 14-is printed on the floor at the medium substrate back side, 15a-first slot element, 15b-second slot element, 15c-the 3rd slot element, 15d the 4th slot element, 16a-first metallic vias, 16b-second metallic vias, 16c-the 3rd metallic vias, 16d-the 4th metallic vias, 17a-first microstrip feed line, 17b-second microstrip feed line, 17c-the 3rd microstrip feed line, 17d-the 4th microstrip feed line, 18a-first excitation port, 18b-second excitation port, 18c-the 3rd excitation port, 18d-the 4th excitation port, 19a-first short circuit minor matters, 19b-second short circuit minor matters, 19c-the 3rd short circuit minor matters, 19d-the 4th short circuit minor matters, 21a-first antenna element, 21b-second antenna element, 21c-third antenna unit, 21d-the 4th antenna element.
Number of antennas integrated is in a limited space more, and obtain wide impedance bandwidth will be more difficult.Existing mimo antenna design, is mainly devoted to the mutual coupling problem how reduced between antenna element, does not almost consider the problem how increasing impedance bandwidth, does not more consider the independent controlled problem of bandwidth.The method that mimo antenna in the present invention utilizes minor matters to load, the antenna element in an open circuit gap loads one section with microstrip feed line with wide short circuit minor matters.The short circuit minor matters loaded can make the input impedance of original slot antenna change, thus create a mode of resonance more.Create a resonance frequency exactly corresponding to S parameter, the broadening impedance bandwidth of original slot antenna element more.Length and the short circuit minor matters of adjustment short circuit minor matters just can change the size of newly-increased resonance frequency with the relative position in open circuit gap, reach the effect of control antenna bandwidth.Therefore this mimo antenna unit in undersized situation, can obtain good impedance bandwidth, and bandwidth is independent controlled.
Concrete as Fig. 4, a kind of four unit broad-band slot mimo antenna without decoupling arrangements, comprise medium substrate 11, first antenna element 21a, the second antenna element 21b, third antenna unit 21c, the 4th antenna element 21d; Wherein said medium substrate 11 comprises medium substrate front 12 and the medium substrate back side 13, and floor 14 is printed on the medium substrate back side 13, first antenna element 21a, the second antenna element 21b, third antenna unit 21c, the 4th antenna element 21d structure are identical;
Wherein said first antenna element 21a, the second antenna element 21b, third antenna unit 21c, the 4th antenna element 21d include the first slot element 15a be printed on floor 14, the second slot element 15b, the 3rd slot element 15c and the 4th slot element 15d respectively, and are printed on the first microstrip feed line 17a, the second microstrip feed line 17b, the 3rd microstrip feed line 17c and the 4th microstrip feed line 17d in medium substrate front 12; First microstrip feed line 17a, the second microstrip feed line 17b, the 3rd microstrip feed line 17c and the 4th microstrip feed line 17d are corresponding slot element feed respectively by the first excitation port 18a, the second excitation port 18b of one end, the 3rd excitation port 18c, the 4th excitation port 18d; The other end of the first microstrip feed line 17a, the second microstrip feed line 17b, the 3rd microstrip feed line 17c and the 4th microstrip feed line 17d loads the first short circuit minor matters 19a, the second short circuit minor matters 19b, the 3rd short circuit minor matters 19c and the 4th short circuit minor matters 19d respectively.Wherein the first short circuit minor matters 19a, the second short circuit minor matters 19b, the 3rd short circuit minor matters 19c and the 4th short circuit minor matters 19d realize the circuit characteristic of short circuit respectively by the first metallic vias 16a, the second metallic vias 16b, the 3rd metallic vias 16c and the 4th metallic vias 16d.
Described floor 14 is square floor, described first slot element 15a, the second slot element 15b, the 3rd slot element 15c and the 4th slot element 15d are separately positioned on four limits on square floor, and adjacent slot element is orthogonal, relative slot element minor face is relative.
Wherein described first microstrip feed line 17a, the second microstrip feed line 17b, the 3rd microstrip feed line 17c and the 4th microstrip feed line 17d are set to L-type, the excitation port in four antenna elements are separately positioned on four limits of medium substrate 11.
First short circuit minor matters 19a, the second short circuit minor matters 19b, the 3rd short circuit minor matters 19c and the 4th short circuit minor matters 19d are L-type, the metallic vias of correspondence are separately positioned on four limits of medium substrate 11.
First slot element 15a, the second slot element 15b, the 3rd slot element 15c and the 4th slot element 15d are separately positioned on four limits on square floor, and adjacent slot element is orthogonal, relative slot element minor face is relative, can improve the isolation between antenna element.
Microstrip feed line loads short circuit minor matters and can expand slot antenna element impedance bandwidth, from the curve chart of Fig. 3, the Electromagnetic Simulation curve of the frequency response of the slot antenna element (Ant-1) not loading short circuit minor matters and the slot antenna element (Ant-2) loading short circuit minor matters can well be understood.The slot antenna element not loading short circuit minor matters only has a resonance frequency 110, and impedance bandwidth (| S
11|≤-10 dB) narrow.The slot antenna element (Ant-2) loading short circuit minor matters adds a resonance frequency 111 compared to the slot antenna element (Ant-1) not loading short circuit minor matters at low frequency place.Because the loading of short circuit minor matters can make the input impedance of former slot antenna element change, corresponding to being just the increase in a resonance frequency in S parameter, namely slot antenna element adds a mode of resonance.Two modes of resonance that the mode of resonance produced because minor matters load and the basic mode of original slot antenna element form, make the slot antenna element (Ant-2) loading short circuit minor matters be provided with two-frequency operation characteristic.Adjustment short circuit minor matters length and its relative position with slot element, can change the position of newly-increased resonance frequency 111, thus make double frequency-band synthetic wideband, the broadening original bandwidth of operation of slot antenna element, and reach the controlled object of bandwidth independence.
Short circuit minor matters bending l-shaped, make the radiation directionality of antenna element better, good radiation directionality makes the space wave mutual coupling between antenna element reduce widely.The microstrip feed line of 50 ohm also bends l-shaped, the excitation port of four antenna elements is placed on respectively four limits of medium substrate, floor electric current flows to another excitation port path from an excitation port can be extended, the mutual coupling caused by floor surface ripple can be reduced well.
A kind of four unit broad-band slot mimo antenna without decoupling arrangements that the present invention proposes, overcome existing mimo antenna and necessarily improve the problem of antenna element interval from degree by introducing decoupling arrangements; Be a kind of structure simple, be easy to the four unit interstices mimo antenna of processing, the method adopting short circuit minor matters to load can the bandwidth of effective broadening antenna, and it is independently controlled to realize bandwidth; The present invention effectively overcomes existing four unit mimo antenna cannot realize the controlled difficult problem of small size, high-isolation, wide bandwidth and bandwidth simultaneously.
The present invention proposes the bandwidth of the method broadening mimo antenna utilizing short circuit minor matters to load in the mimo antenna of design gap, and the bandwidth simultaneously realizing mimo antenna is independent controlled.By the layout of rational antenna element, the present invention proposes a kind of high-isolation four unit mimo antenna without decoupling arrangements.This mimo antenna is simple and compact for structure, making is easy, isolation is high and bandwidth is independent controlled, can in multipath communication environment, good diversity gain is provided, opposing multipath fading, the channel capacity of raising system, the mimo antenna that the present invention proposes is well suited for being applied to as in the small hand-held mobile communication equipments such as mobile phone, has real engineer applied and is worth.。
Embodiment 1
The structure of the small-sized four unit broad-band slot mimo antenna of a kind of high-isolation without decoupling arrangements only comprises four slot antenna element.Each slot antenna element is loaded with the gap of short circuit minor matters by one section and the microstrip feed line of a section 50 ohm forms.By the design that short circuit minor matters load, wide impedance bandwidth and bandwidth can be realized independent controlled; By rational antenna arrangement, high-isolation ground designing requirement can be realized.Simulated response curve of the present invention as shown in Figure 5 and Figure 6.
Compared with prior art, tool of the present invention has the following advantages:
The small-sized four unit broad-band slot mimo antenna of high-isolation of the present invention, do not introduce any decoupling mechanism, mimo antenna can be made equally to have the characteristic of high-isolation in mimo antenna.Secondly the method by loading short circuit minor matters carrys out the impedance bandwidth of broadening antenna, makes the bandwidth of mimo antenna independent controlled.Mimo antenna of the present invention solves the narrow bandwidth of existing four unit mimo antenna, low isolation, large scale and the uncontrollable shortcoming of bandwidth.
Be embodied in:
1, the small-sized mimo antenna of existing mobile terminal device designs the mutual coupling problem how main consideration reduces between antenna element, does not only consider the problem how increasing impedance bandwidth, does not also consider the independent controlled problem of bandwidth.Method broadening that the present invention utilizes minor matters the to load impedance bandwidth of mimo antenna, and bandwidth is simultaneously also adjustable.Compared with existing small-sized mimo antenna, mimo antenna of the present invention is stronger in the applicability of the mobile terminal device of different operating frequency range for work on hand.
2, the design of existing mobile terminal device small-sized mimo antenna mainly through introduce floor minor matters, external decoupling network, parasitic element and in and the decoupling arrangements such as line improve isolation between antenna element.But these structures not only can increase original size and the manufacture difficulty of mimo antenna, also can have an impact to original impedance bandwidth of mimo antenna.And the mode that the present invention is placed by antenna arrangement reasonable in design and port, make mimo antenna unit have radiation directionality.Therefore the mimo antenna that the present invention proposes also can have the characteristic of high-isolation when not introducing any decoupling module and element.Compared with existing small-sized mimo antenna, mimo antenna size of the present invention is less, and the integrality on antenna floor obtains good protection, for very large free space reserved by all the other radio circuits.
3, compare with existing four unit MIMO antenna arrays, the present invention has less size, and simpler structure can reduce production cost; Have wider impedance bandwidth, higher isolation and the independent controlled characteristic of bandwidth, go in a greater variety of small hand held devices system.
Above-described embodiments of the present invention, do not form limiting the scope of the present invention.Any amendment done within spiritual principles of the present invention, equivalent replacement and improvement etc., all should be included within claims of the present invention.
Claims (5)
1., without four unit broad-band slot mimo antenna of decoupling arrangements, comprise medium substrate (11), the first antenna element (21a), the second antenna element (21b), third antenna unit (21c), the 4th antenna element (21d); Wherein said medium substrate (11) comprises medium substrate front (12) and the medium substrate back side (13), floor (14) is printed on the medium substrate back side (13), and the first antenna element (21a), the second antenna element (21b), third antenna unit (21c), the 4th antenna element (21d) structure are identical; It is characterized in that,
Described first antenna element (21a), the second antenna element (21b), third antenna unit (21c), the 4th antenna element (21d) include the first slot element (15a) be printed on floor (14), the second slot element (15b), the 3rd slot element (15c) and the 4th slot element (15d) respectively, and are printed on first microstrip feed line (17a) in medium substrate front (12), the second microstrip feed line (17b), the 3rd microstrip feed line (17c) and the 4th microstrip feed line (17d); First microstrip feed line (17a), the second microstrip feed line (17b), the 3rd microstrip feed line (17c) and the 4th microstrip feed line (17d) are corresponding slot element feed respectively by first excitation port (18a) of one end, the second excitation port (18b), the 3rd excitation port (18c), the 4th excitation port (18d); The other end of the first microstrip feed line (17a), the second microstrip feed line (17b), the 3rd microstrip feed line (17c) and the 4th microstrip feed line (17d) offers promising metallic vias respectively;
Described floor (14) is square floor, described first slot element (15a), the second slot element (15b), the 3rd slot element (15c) and the 4th slot element (15d) are separately positioned on four limits on square floor, and adjacent slot element is orthogonal, relative slot element minor face is relative.
2. the four unit broad-band slot mimo antenna without decoupling arrangements according to claim 1, it is characterized in that, described first microstrip feed line (17a), the second microstrip feed line (17b), the 3rd microstrip feed line (17c) and the 4th microstrip feed line (17d) are set to L-type, the excitation port in four antenna elements are separately positioned on four limits of medium substrate (11).
3. the four unit broad-band slot mimo antenna without decoupling arrangements according to claim 2, it is characterized in that, respectively at the first microstrip feed line (17a), second microstrip feed line (17b), the metallic vias end of the 3rd microstrip feed line (17c) and the 4th microstrip feed line (17d) loads with corresponding microstrip feed line with the first wide short circuit minor matters (19a), second short circuit minor matters (19b), 3rd short circuit minor matters (19c) and the 4th short circuit minor matters (19d), and the other end of short circuit minor matters offers corresponding the first metallic vias (16a), second metallic vias (16b), 3rd metallic vias (16c) and the 4th metallic vias (16d).
4. the four unit broad-band slot mimo antenna without decoupling arrangements according to claim 3, it is characterized in that, described first short circuit minor matters (19a), the second short circuit minor matters (19b), the 3rd short circuit minor matters (19c) and the 4th short circuit minor matters (19d) are L-type, the metallic vias of correspondence are separately positioned on four limits of medium substrate (11).
5. the four unit broad-band slot mimo antenna without decoupling arrangements according to any one of Claims 1-4, is characterized in that, described substrate media (11) adopts relative medium electric constant to be 1-100, and thickness is the medium substrate of 0.2-5mm.
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| CN105576372B (en) * | 2016-02-26 | 2019-05-14 | 华南理工大学 | A kind of miniaturization difference trap UWB-MIMO antenna |
| CN105576372A (en) * | 2016-02-26 | 2016-05-11 | 华南理工大学 | Small differential notch UWB-MIMO antenna |
| CN108429012A (en) * | 2017-02-15 | 2018-08-21 | 华为技术有限公司 | A kind of antenna and mobile terminal of mobile terminal |
| CN106961016B (en) * | 2017-05-08 | 2023-06-23 | 江苏亨鑫科技有限公司 | Four-unit MIMO antenna with different polarization and directional patterns |
| CN106961016A (en) * | 2017-05-08 | 2017-07-18 | 江苏亨鑫科技有限公司 | A kind of polarization and four different unit mimo antennas of directional diagram |
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| US10916851B2 (en) | 2017-09-04 | 2021-02-09 | Acer Incorporated | Mobile electronic device |
| CN109509961A (en) * | 2017-09-15 | 2019-03-22 | 宏碁股份有限公司 | Electronic apparatus |
| CN109509961B (en) * | 2017-09-15 | 2020-12-22 | 宏碁股份有限公司 | Mobile electronic device |
| CN107799902A (en) * | 2017-10-31 | 2018-03-13 | 珠海市魅族科技有限公司 | A kind of multiple-input and multiple-output mimo antenna |
| CN109244624A (en) * | 2018-11-07 | 2019-01-18 | 深圳市信维通信股份有限公司 | A kind of indoor small base station |
| CN109244624B (en) * | 2018-11-07 | 2023-12-19 | 深圳市信维通信股份有限公司 | Indoor small-sized base station |
| CN109818134A (en) * | 2019-03-18 | 2019-05-28 | 青岛海信移动通信技术股份有限公司 | A kind of terminal with metal edge frame antenna |
| CN112635985B (en) * | 2020-12-11 | 2021-11-23 | 西安电子科技大学 | Low-profile eight-port MIMO antenna integrated on back cover of 5G mobile phone |
| CN112635985A (en) * | 2020-12-11 | 2021-04-09 | 西安电子科技大学 | Low-profile eight-port MIMO antenna integrated on back cover of 5G mobile phone |
| CN114050397A (en) * | 2021-07-06 | 2022-02-15 | 南京航空航天大学 | Dual-port chip integrated MIMO antenna based on TM10 mode |
| CN114050397B (en) * | 2021-07-06 | 2022-11-25 | 南京航空航天大学 | Dual-port chip integrated MIMO antenna based on TM10 mode |
| CN114843762A (en) * | 2022-04-20 | 2022-08-02 | 电子科技大学 | Frequency reconfigurable MIMO antenna |
| CN114843762B (en) * | 2022-04-20 | 2023-05-16 | 电子科技大学 | MIMO antenna with reconfigurable frequency |
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