CN104218320A - Tripolar magneto-dipole MIMO (multiple input multiple output) antenna system - Google Patents
Tripolar magneto-dipole MIMO (multiple input multiple output) antenna system Download PDFInfo
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Abstract
The invention relates to a tripolar magneto-dipole MIMO (multiple input multiple output) antenna system and belongs to the technical field of wireless communication systems. A tripolar magneto-dipole MIMO antenna is composed of a first loop antenna, a second loop antenna and a third loop antenna which are mutually orthogonal. Geometric centers of the first, the second and the third loop antennas are located at one spatial point and feed respectively. Each loop antenna has evenly distributed current; meanwhile, the first, the second and the third loop antennas are low in coupling; MIMO channel capacity is high accordingly. The compact MIMO antenna with high channel capacity is composed of the coincident low-coupled tripolar magneto-dipoles. Extraction and utilization of three magnetic field polarization components are achieved, and three polarization degrees of freedom of the magnetic field components can be acquired accordingly.
Description
Technical field
The present invention relates to a kind of 3 polarization magnetic dipole MIMO antenna systems, belong to wireless communication system technologies field.
Background technology
Because MIMO technology has very large potentiality aspect the channel capacity of wireless communication system and gets more and more people's extensive concerning improving.But, in order to obtain larger channel capacity, require the antenna of realizing mimo system can obtain enough large spatial degrees of freedom.The spatial degrees of freedom of a mimo system refers to the independent subchannels number that it can be supported.In traditional mimo system based on single-polarized antenna, in order to obtain enough large spatial degrees of freedom, require the array element distance that transmits and receives antenna all to want enough large.In the abundant environment of multipath, minimum array element distance is half wavelength, and reaches possibly 5-10 wavelength in the sparse environment of multipath.Because the bulk of base station and mobile client is all very limited, therefore the application of traditional mimo system based on single-polarized antenna has been subject to a lot of restrictions, and mimo system based on multi-polarization antenna can well address this problem.In the mimo system forming at multi-polarization antenna, due to the utilization to polarization of electromagnetic field information, can realize by antenna space concurrent, different polarization modes, therefore multipolarization MIMO antenna provides a kind of technology that realizes of compact mimo system.
In addition, the multi-polarization antenna of this concurrent is owing to can surveying vector electromagnetic field component, also referred to as vector sensor.Vector sensor except can, for radio communication, also having important using value in the system such as wireless location and navigation.
Three of space concurrent orthogonal electric dipoles and three orthogonal magnetic-dipole antennas can obtain at most 6 spatial degrees of freedom in theory.In fact,, compared with concurrent, the design of orthogonal electrical dipole antenna, the concurrent of low coupling, orthogonal magnetic-dipole antenna design difficulty are larger, owing to more easily producing coupling between loop antenna adjacent to each other.
Therefore, the design of concurrent, orthogonal 3 electric dipoles is comparatively common, and the design of concurrent, orthogonal multiple magnetic-dipole antennas is also rare.In addition find by the research in early stage, in order to obtain larger mimo channel capacity, require loop antenna to have the antenna pattern that approaches desirable magnetic dipole.And in order to obtain a loop antenna that approaches desirable magnetic dipole radiation characteristic, requiring electric current on becket to have is uniformly distributed, two kind of two polarization orthogonal loop antenna proposed respectively in document [1] and [2], and have uniform current distribute, open report is also seldom seen in the design of concurrent, low coupling, 3 orthogonal magnetic-dipole antennas.
Only find at present the design of 2 polarization magnetic-dipole antennas of several concurrents, and 3 polarization magnetic-dipole antennas of concurrent are also seldom seen.Compared with 2 polarization magnetic-dipole antennas, magnetic-dipole antenna by 3 polarization can obtain the channel capacity gain of the highest 1.5 times, designs as seen 3 polarization magnetic-dipole antennas and has vital meaning for the mimo system of realizing compact, spectral efficient.
But if the concurrent, the 3 polarization loop antennas that adopt 3 common loop antennas to form can produce very large coupling between them, the radiation efficiency that causes antenna is very low and cannot use.
Document [1] B.Elnour and D.Erricolo, " a kind of concurrent cross polarization dicyclo PCB antenna that works in 2.4-GHz of novelty, " IEEE Antennas Wireless Propag.Lett., vol.9, pp.1237-1240,2010.
Document [2] D.Piao, Y.Mao, and H.Zhang, " two kinds of novel low coupled antennas of concurrent dual polarization for polarization diversity MIMO application; " in Proc.The 2nd International Conference on Connected Vehicles & Expo (ICCVE2013), Las Vegas, USA, Dec.2-6,2013.
Summary of the invention
In order to overcome the deficiencies in the prior art, the invention provides a kind of 3 polarization magnetic dipole MIMO antenna systems.
A kind of concurrent, low coupling, positive intersecting and merging have 3 polarization magnetic dipole MIMO antennas of high channel capacity, 3 polarization magnetic dipole MIMO antennas are made up of 3 mutually orthogonal first ring antennas, the second loop antenna and the 3rd loop antenna, the geometric center of this first ring antenna, the second loop antenna and the 3rd loop antenna is arranged in the same point in space, respectively feed; On each loop antenna, have uniform CURRENT DISTRIBUTION, the coupling between first ring antenna, the second loop antenna and the 3rd loop antenna is simultaneously lower, thereby has higher mimo channel capacity;
Wherein first ring antenna, the second loop antenna in 3 polarization magnetic-dipole antennas realized uniform CURRENT DISTRIBUTION by cycle capacitive load; This loop antenna is printed on Teflon substrate, and the performance parameter of substrate is ε
r=2.65, tan δ=0.002, thickness h=0.7mm; Whole ring is divided into eight parts uniformly, wherein on Part I, is connecting impedance matching transducer;
The design parameter of ring: outer radius R
1=23.5mm, inside radius R
2=20.5mm, the angle of each section of arc strip line is a
1=44 °, the interval between adjacent arc strip line is a
2=1 °.
The MIMO antenna with higher channel capacity that advantage of the present invention utilizes three polarization magnetic dipoles of concurrent, low coupling to form first.Compared with polarization magnetic-dipole antenna, it can realize extraction and the utilization of three field pole polarization component, thereby can obtain three polarization degrees of freedom of magnetic-field component.Because the structure of antenna is that geometric center concurrent is orthogonal, the size of whole antenna system is narrowed down to (0.19 λ)
3, wherein λ is the operation wavelength in free space, is conducive to the realization of the limited MIMO antenna system of bulk.In addition, still obtained comparatively desirable isolation in realizing cramped construction, when operating frequency is 2.4GHz, isolation can reach 38dB.
Brief description of the drawings
When considered in conjunction with the accompanying drawings, by the detailed description with reference to below, can more completely understand better the present invention and easily learn wherein many advantages of following, but accompanying drawing described herein is used to provide a further understanding of the present invention, form a part of the present invention, schematic description and description of the present invention is used for explaining the present invention, does not form inappropriate limitation of the present invention, as schemed wherein:
3 polarization magnetic-dipole antenna schematic diagrames of Fig. 1, concurrent, orthogonal, low coupling;
The structural representation of Fig. 2, single magnetic dipole 1 and 2;
Fig. 3, concurrent, orthogonal 2 magnetic-dipole antenna schematic diagrames;
Fig. 4, the 3rd magnetic-dipole antenna structural representation;
The structural representation of Fig. 5, single magnetic dipole 1 and 2 after cracking;
The reflecting properties schematic diagram of Fig. 6,3 polarization magnetic-dipole antennas;
The coupling performance schematic diagram of Fig. 7,3 polarization magnetic-dipole antennas;
The channel capacity comparison of Fig. 8 (a), 3 polarization magnetic-dipole antennas and 2 polarization magnetic-dipole antennas; 2 polarization magnetic dipole curve charts;
The channel capacity comparison of Fig. 8 (b), 3 polarization magnetic-dipole antennas and 2 polarization magnetic-dipole antennas; 3 polarization magnetic dipole curve charts;
3 polarize magnetic-dipole antenna and 2 polarization magnetic-dipole antenna mimo channel matrix exgenvalue comparisons when Fig. 9 (a), dual-mode antenna height equate; 2 polarization magnetic dipole curve charts;
3 polarize magnetic-dipole antenna and 2 polarization magnetic-dipole antenna mimo channel matrix exgenvalue comparisons when Fig. 9 (b), dual-mode antenna height equate; 3 polarization magnetic dipole curve charts;
Figure 10 (a), dual-mode antenna height be 3 polarize magnetic-dipole antenna and 2 polarization magnetic-dipole antenna mimo channel matrix exgenvalue comparisons not etc. time, 2 polarization magnetic dipole curve charts;
Figure 10 (b), dual-mode antenna height be 3 polarize magnetic-dipole antenna and 2 polarization magnetic-dipole antenna mimo channel matrix exgenvalue comparisons not etc. time, 3 polarization magnetic dipole curve charts.
Below in conjunction with drawings and Examples, the present invention is further described.
Embodiment
Obviously the many modifications and variations that, those skilled in the art do based on aim of the present invention belong to protection scope of the present invention.
Embodiment 1: as shown in the figure,
In the present invention, disclose and a kind ofly had that uniform current distributes, the MIMO antenna system that concurrent, low coupling, orthogonal 3 polarization magnetic dipoles form.
The 3 polarization magnetic dipole MIMO antenna systems that build a concurrent, low coupling, first, the center of antenna element will be arranged in the same point in space and keep orthogonal, is beneficial to receive the magnetic-field component of three polarised directions.Secondly, for obtain one with the similar antenna pattern of magnetic dipole, the electric current on ring need to have and is uniformly distributed.Finally, the more important thing is that the isolation that will make between antenna element is enough greatly to obtain larger radiation efficiency.
In the present invention, form 3 polarization magnetic dipole MIMO antennas (first ring antenna 1, the second loop antenna 2 and the 3rd loop antenna 3) a kind of low coupling, orthogonal by loop antenna particular design, that there is uniform current distribution, as shown in Figure 1.
For a common loop antenna, be difficult to realize the upper uniform CURRENT DISTRIBUTION of ring, as shown in Figure 2, the ring of this particular design, realize uniform CURRENT DISTRIBUTION by cycle capacitive load, first ring antenna 1, the second loop antenna 2 in the 3 polarization magnetic-dipole antennas of Fig. 1 adopt this structure.
First ring antenna 1, the second loop antenna 2 are printed on Teflon substrate, and the performance parameter of substrate is ε
r=2.65, tan δ=0.002, thickness h=0.7mm.
The whole ring of first ring antenna 1, the second loop antenna 2 is divided into eight parts uniformly, wherein on Part I, is connecting impedance matching transducer.Below the design parameter of this ring: outer radius R
1=23.5mm, inside radius R
2=20.5mm, the angle of each section of arc strip line is a
1=44 °, the interval between adjacent arc strip line is a
2=1 °.
For capacitive load performance period, add the coupling line interweaving mutually in one end of each arc strip line.This part of parameter is: the banded live width w of inner arc
s=1mm, angle a
3=11 °, and with the inner boundary of the hollow out strip line g of being separated by
s=0.4mm, with the hollow out strip line bottom angle a of being separated by
4=1 °.The length of two parallel strip line impedance matching boxs is l
p=13mm, width w
p=0.5mm, they are spaced apart 0.8mm.
Utilize the feeder line gap of this ring, in the interval between the impedance transducer of first ring antenna 1, the second loop antenna 2, respectively cut out a gap very easily, so just can make them can form a concurrent, orthogonal 2 poliarizing antennas.Should be noted that, the width in gap is 0.8mm, and the thickness of whole substrate is 0.7mm, does not contact with each other in order to make to print copper strips line, two rings 0.1mm that will stagger mutually.As shown in Figure 3.
Another key issue of the present invention is to realize on the basis of 2 orthogonal magnetic-dipole antennas, how to insert and there is the 3rd magnetic dipole that uniform current distributes, make it and other 2 magnetic dipoles there is close working band, and there is lower coupling.
All be positioned at the edge of dielectric-slab and another benefit that adopts this ring structure is metal part wherein, can insert very easily the 3rd loop antenna 3.
If but adopt the loop antenna of same structure as the 3rd ring, the size that needs to dwindle the 3rd loop antenna 3, but its operating frequency has just changed like this.
Therefore,, in order to make 3 rings have a common working band, the loop antenna that adopts another to have uniform current distribution in the present invention comes as the 3rd magnetic dipole, as shown in Figure 4.It is the loop antenna that utilizes a kind of artificial transmission line with zero propagation constant to realize, and the electric current of this ring is kept in the same way, thereby obtains the horizontal polarization omni directional radiation pattern of similar magnetic dipole.
It is printed on dielectric-slab equally, and parallel microstrip line is printed on the two sides of plate, and the material of dielectric-slab is Teflon, and performance parameter is ε
r=2.65, tan δ=0.002, thickness h=0.7mm.Whole ring is made up of 12 parts, and each six up and down, wherein first part middle opening, as feed mouth, does not need impedance matching box through parameter optimization.
Design parameter is as follows: the center radius of ring is R=14mm, the angle a of each section of arc strip line
1=54 °, the gap of adjacent arc strip line is a
2=6 °, micro belt line width is W=4mm.
In order to insert the 3rd ring, in the ring shown in Fig. 2, output a long 40mm who passes through initial point perpendicular to impedance transducer, the gap of wide 0.8mm, as shown in Figure 5.
Like this, obtained a kind of as shown in Figure 1,3 compact, orthogonal polarization magnetic dipole MIMO antenna systems, its whole volume is not more than 23.5mm
3.
In Fig. 6, provide the S of antenna
1,1, S
2,2and S
3,3, in Fig. 7, provided S simultaneously
1,2, S
2,1, S
1,3, S
3,1, S
3,2and S
2,3.From Fig. 6, see, consider that return loss is greater than the bandwidth of 10dB, the bandwidth of operation that 3 rings can be overlapping is between 2.35GHz to 2.45GHz, can meet the requirement of the wireless communication system such as WiFi of the ISM band that works in 2.4GHz.Can, by adjusting the parameter of the 3rd loop antenna 3, make its operating frequency between 2.28-2.85GHz in addition, meet the more requirement of wide frequency ranges.
As can see from Figure 7, when antenna element is operated in frequency and is less than 2.65GHz, isolation is all greater than 20dB.If be operated in 2.4GHz, the return loss of first ring antenna 1, the second loop antenna 2 is 14dB, and the return loss of the 3rd loop antenna 3 is 28dB, and the isolation of 3 antennas can reach 38dB.
Embodiment 2: as shown in the figure,
The channel capacity of a communication system is to weigh the important indicator of systematic function, and it refers to the maximum information rate that a channel can inerrancy transmits.The channel capacity of mimo system and the result of 2 polarization magnetic-dipole antennas that below this 3 polarization magnetic-dipole antennas are formed compare, and 2 polarization magnetic-dipole antennas are wherein made up of the first ring antenna 1 (magnetic dipole) in Fig. 1, the second loop antenna 2 (magnetic dipole).
The channel capacity computing formula of mimo system is:
Here I is 3 × 3 unit matrix, n
tbe the number of transmitting antenna, SNR is received signal to noise ratio, is made as 20dB,
it is the conjugate transpose of matrix H.
Compared with single polarization system, multipolarization mimo system generally can obtain larger channel capacity gain in the abundant environment of multipath, therefore, selected a corridor with PEC (desired electrical conductor) border as applied environment, because this is that a kind of multipath is compared with the environment of horn of plenty.Channel matrix wherein obtains by HFSS software emulation.
Concrete simulation parameter arranges as follows: corridor size: 200cm (length) × 80cm (wide) × 80cm (height), height of transmitting antenna h
t=40cm, reception antenna height h
rin two kinds of situation, #1:h
r=40cm, #2:h
r=20cm.In Fig. 8 (a), Fig. 8 (b), the channel capacity of 3 polarization magnetic-dipole antennas and 2 polarization magnetic-dipole antennas is compared, Fig. 8 (a) and Fig. 8 (b) are respectively the result of the channel capacity of 2 polarization and 3 polarization magnetic-dipole antennas.The wherein curve 1 in Fig. 8 (a) and Fig. 8 (b) and curve 2 corresponding situation #1 and situation #2 above respectively.
As can see from Figure 8, adopt this 3 polarization magnetic-dipole antennas channel capacities that can obtain apparently higher than 2 polarization magnetic-dipole antennas, its gain is about 1.5 times.
In addition, to also being calculated by the characteristic value of this 3 polarization magnetic-dipole antennas and 2 mimo channels that form of polarization magnetic-dipole antennas, because the number of the characteristic value of a mimo channel and size have reflected the size of existing independent parallel number of subchannels (spatial degrees of freedom) and each subchannel capacities in this channel.Fig. 9 (a), Fig. 9 (b) and Figure 10 (a), Figure 10 (b) are respectively the identical and results under same case not of dual-mode antenna height.
From Fig. 9 (a), Fig. 9 (b) and Figure 10 (a), Figure 10 (b), can see, the characteristic value of the mimo channel matrix that employing 2 polarization magnetic-dipole antennas can obtain is 2, and the characteristic value that can obtain by 3 polarization magnetic-dipole antennas is 3.In addition, the size of characteristic value is also relevant with the relative altitude of dual-mode antenna, compares, with the situation that dual-mode antenna height equates in the time that dual-mode antenna height does not wait, 3 polarization the 2nd of magnetic-dipole antennas and the 3rd characteristic value can obviously diminish, and therefore channel capacity also can decline to some extent accordingly.
3 polarization magnetic dipole MIMO antennas of a kind of concurrent, orthogonal, low coupling to sum up, have been proposed in the present invention.Through the adjustment optimization to geometric parameter, each loop aerial has been obtained good impedance matching, can be operated in 2.4GHz frequency range.By the special construction of this 3 polarization magnetic-dipole antennas, in having ensured the compactedness of antenna system, also obtain the isolation between desirable antenna element, therefore can be applied in 3 polarization mimo systems, improve the acquisition capability of the magnetic-field component to 3 orthogonal directions, promote thereby channel capacity is obtained, also can be used for the reference antenna of electromagnetic vector detector (EMVS) simultaneously.
Embodiment 3: as shown in the figure, key point of the present invention is to utilize polarization diversity principle, a kind of compactness has been proposed, formed by 3 magnetic dipoles (first ring antenna 1, the second loop antenna 2 and the 3rd loop antenna 3), geometric center concurrent, orthogonal, 3 polarization MIMO antennas of low coupling, high channel capacity.
Solved 3 loop antennas compact when orthogonal, high-isolation realize this key problem.This antenna can be used in multipolarization MIMO communication system, can realize the obtaining of magnetic-field component of 3 orthogonal directions, and channel capacity is increased.Also can be used as the reference antenna of electromagnetic vector detector (EMVS) simultaneously.The concrete feature of this antenna is described below:
This is one the three MIMO antenna system that polarization loop antenna forms, and has uniform CURRENT DISTRIBUTION, thereby have the radiance of similar magnetic-dipole antenna in these loop antennas.
The concurrent of having realized first three magnetic-dipole antennas is orthogonal, has improved the problem of utilizing to three magnetic-field components in multipolarization MIMO communication.
Realized compact structure, for the operating frequency of 2.4GHz, the volume of whole system is (0.19 λ)
3.
This antenna has higher isolation and good return loss performance, for the operating frequency of 2.4GHz, the isolation of 3 antennas can reach 38dB, and the return loss of first ring antenna 1, the second loop antenna 2 is 14dB, and the return loss of the 3rd loop antenna 3 is 28dB.
As mentioned above, embodiments of the invention are explained, but as long as not departing from fact inventive point of the present invention and effect can have a lot of distortion, this will be readily apparent to persons skilled in the art.Therefore, within such variation is also all included in protection scope of the present invention.
Claims (6)
1. a concurrent, low coupling, positive intersecting and merging have 3 polarization magnetic dipole MIMO antennas of high channel capacity, it is characterized in that 3 polarization magnetic dipole MIMO antennas are made up of 3 mutually orthogonal first ring antennas, the second loop antenna and the 3rd loop antenna, the geometric center of this first ring antenna, the second loop antenna and the 3rd loop antenna is arranged in the same point in space, respectively feed; On each loop antenna, have uniform CURRENT DISTRIBUTION, the coupling between first ring antenna, the second loop antenna and the 3rd loop antenna is simultaneously lower, thereby has higher mimo channel capacity;
Wherein first ring antenna, the second loop antenna in 3 polarization magnetic-dipole antennas realized uniform CURRENT DISTRIBUTION by cycle capacitive load; The 3rd loop antenna utilizes a kind of artificial transmission line with zero propagation constant to realize uniform CURRENT DISTRIBUTION, and the electric current of the 3rd loop antenna is kept in the same way, thereby obtains the horizontal polarization omni directional radiation pattern of similar magnetic dipole.
2. a kind of concurrent according to claim 1, low coupling, positive intersecting and merging have 3 polarization magnetic dipole MIMO antennas of high channel capacity, it is characterized in that first ring antenna and the second loop antenna are printed on Teflon substrate, and the performance parameter of substrate is ε
r=2.65, tan δ=0.002, thickness h=0.7mm; Whole ring is divided into eight parts uniformly, wherein on Part I, is connecting impedance matching transducer;
The design parameter of ring: outer radius R
1=23.5mm, inside radius R
2=20.5mm, the angle of each section of arc strip line is a
1=44 °, the interval between adjacent arc strip line is a
2=1 °;
Add the coupling line interweaving mutually in one end of each arc strip line; This part of parameter is: the banded live width w of inner arc
s=1mm, angle a
3=11 °, and with the inner boundary of the hollow out strip line g of being separated by
s=0.4mm, with the hollow out strip line bottom angle a of being separated by
4=1 °; The length of two parallel strip line impedance matching boxs is l
p=13mm, width w
p=0.5mm, they are spaced apart 0.8mm.
3. a kind of concurrent according to claim 1, low coupling, positive intersecting and merging have 3 polarization magnetic dipole MIMO antennas of high channel capacity, it is characterized in that respectively cutting out a gap in the interval between the impedance transducer of first ring antenna, the second loop antenna, make them can form a concurrent, orthogonal 2 poliarizing antennas; The width in gap is 0.8mm, and the thickness of whole substrate is 0.7mm, does not contact with each other two rings 0.1mm that will stagger mutually in order to make to print copper strips line.
4. a kind of concurrent according to claim 1, low coupling, positive intersecting and merging have 3 polarization magnetic dipole MIMO antennas of high channel capacity, it is characterized in that being all positioned at the edge of dielectric-slab in the metal part of first ring antenna, this ring structure of the second loop antenna, thereby be beneficial to the insertion of the 3rd loop antenna; The 3rd loop antenna and first ring antenna, second loop antenna with uniform current distribution that insert have close working band, and have lower coupling.
5. a kind of concurrent according to claim 4, low coupling, positive intersecting and merging have 3 polarization magnetic dipole MIMO antennas of high channel capacity, it is characterized in that the 3rd loop antenna is printed on dielectric-slab, parallel microstrip line is printed on the two sides of plate, and performance parameter is ε
r=2.65, tan δ=0.002, thickness h=0.7mm; Whole ring is made up of 12 parts, and each six up and down, wherein first part middle opening, as feed mouth, does not need impedance matching box through parameter optimization;
Design parameter is as follows: the center radius of ring is R=14mm, the angle a of each section of arc strip line
1=54 °, the gap of adjacent arc strip line is a
2=6 °, micro belt line width is W=4mm;
In ring, output a long 40mm who passes through initial point perpendicular to impedance transducer, the gap of wide 0.8mm.
6. a kind of concurrent according to claim 4, low coupling, positive intersecting and merging have 3 polarization magnetic dipole MIMO antennas of high channel capacity, it is characterized in that the bandwidth of operation that first ring antenna, the second loop antenna and the 3rd loop antenna can be overlapping is between 2.35GHz to 2.45GHz, work in the WiFi wireless communication system of the ISM band of 2.4GHz; Adjust the parameter of the 3rd loop antenna, operating frequency can be between 2.28-2.85GHz;
When antenna element is operated in frequency and is less than 2.65GHz, isolation is all greater than 20dB; Be operated in 2.4GHz, the return loss of first ring antenna, the second loop antenna is 14dB, and the return loss of the 3rd loop antenna is 28dB, and the isolation of 3 antennas can reach 38dB.
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| CN106025526B (en) * | 2016-05-10 | 2018-07-27 | 北京理工大学 | A kind of polarization sensitive array antenna |
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| CN111224214A (en) * | 2019-12-31 | 2020-06-02 | 重庆品胜科技有限公司 | Miniature beam-controllable RFID reader antenna based on directional diagram reconstruction |
| CN111224214B (en) * | 2019-12-31 | 2021-06-08 | 重庆品胜科技有限公司 | Miniature beam-controllable RFID reader antenna based on directional diagram reconstruction |
| WO2023173834A1 (en) * | 2022-03-18 | 2023-09-21 | 荣耀终端有限公司 | Mimo antenna system |
| CN115980465A (en) * | 2023-03-17 | 2023-04-18 | 武汉大学 | Electromagnetic vector sensor and electromagnetic signal induction equipment |
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