CN114709606A - Self-decoupling 5G ultra-wideband MIMO antenna pair - Google Patents
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- 239000002184 metal Substances 0.000 claims abstract description 23
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- 230000008878 coupling Effects 0.000 claims abstract description 9
- 238000010168 coupling process Methods 0.000 claims abstract description 9
- 238000005859 coupling reaction Methods 0.000 claims abstract description 9
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 239000010949 copper Substances 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 238000010295 mobile communication Methods 0.000 abstract description 6
- 230000005540 biological transmission Effects 0.000 description 5
- 238000002955 isolation Methods 0.000 description 5
- 238000004891 communication Methods 0.000 description 4
- 230000003071 parasitic effect Effects 0.000 description 4
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
- H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/48—Earthing means; Earth screens; Counterpoises
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/52—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/20—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements characterised by the operating wavebands
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/30—Arrangements for providing operation on different wavebands
- H01Q5/307—Individual or coupled radiating elements, each element being fed in an unspecified way
- H01Q5/342—Individual or coupled radiating elements, each element being fed in an unspecified way for different propagation modes
- H01Q5/35—Individual or coupled radiating elements, each element being fed in an unspecified way for different propagation modes using two or more simultaneously fed points
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Abstract
The invention relates to a self-decoupling 5G ultra-wideband MIMO antenna pair, which comprises a main dielectric substrate, a side dielectric substrate, a metal ground and a plurality of antenna units, wherein the main dielectric substrate is provided with a plurality of first antenna units; the metal ground is positioned below the main dielectric substrate and is arranged close to the main dielectric substrate, the side dielectric substrates are arranged at two sides of the main dielectric substrate, and the plurality of antenna units are symmetrically arranged on the inner side plate surface of the side dielectric substrate; the antenna unit consists of two feed units and a common radiation unit. The antenna unit in the invention carries out coupling feed on the common radiation unit through the feed units on two sides, forms a plurality of resonance frequency points by means of floor current under the condition that the common radiation unit is grounded in multiple points, can effectively cover N77, N78, N79 and 5G WLAN frequency bands divided in fifth generation mobile communication and 5.9 to 7.1GHz frequency bands possibly used in the future, and widens the bandwidth of the antenna unit.
Description
Technical Field
The invention relates to the technical field of wireless communication, in particular to a self-decoupling 5G ultra-wideband MIMO antenna pair.
Background
In recent years, with the rapid development of wireless communication technology and the increasing demand for high transmission rates, fifth generation (5G) mobile communication gradually enters our field of view. To meet these demands, it is necessary to apply Multiple Input Multiple Output (MIMO) technology in a 5G wireless communication system because a large-scale MIMO system can provide a higher channel capacity. Conventional 2 × 2MIMO antenna systems cannot withstand such high data throughput, and therefore 8 × 8MIMO and even 10 × 10MIMO antenna systems are a necessary trend in the development of antenna systems for mobile terminals.
The 5G spectrum has also been essentially completed in regions around the world, and many regions have identified and deployed 5G spectrum. However, the 5G frequency spectrum is mainly divided into sub-6GHz bands of N77(3.3-4.2GHz), N78(3.3-3.8GHz), N79(4.4-5GHz) and LTE band 46(5.15-5.925 GHz). However, to realize the future prospects of multiband 5G NR-U, more possible unlicensed bands need to be supported. Recently, the Federal Communications Commission (FCC) and the European Union of post and telecommunications (CEPT) have begun to investigate the possibility of deploying International Mobile Telecommunications (IMT) services in the 5.9-7.1GHz (5.9-7.1 GHz is considered in the United states and 5.9-6.4GHz in the European Union), which means that 5G sub-6GHz will evolve to 5G sub-7GHz, and even sub-8GHz, in the near future. Therefore, how to design a MIMO antenna structure capable of covering the above multiple frequency bands and satisfying various requirements of the mobile terminal antenna system is one of the major difficulties faced by the current 5G antenna system.
At present, it is common for such 8-port MIMO antenna pair systems to be able to cover the 3.4-3.6GHz band, and these antenna pairs tend to be more compact in size and better in isolation performance, but a MIMO system capable of only covering a single band is not suitable for the 5G band divided in each region, so that the design of a multiband and broadband MIMO antenna pair is necessary. The existing broadband MIMO antenna pair with better performance can cover 3.3-5.0GHz, but the working frequency band still needs to be further widened, so that the design of an ultra-wideband 8-element MIMO antenna pair is urgent.
Disclosure of Invention
The invention aims to provide a self-decoupling 5G ultra-wideband MIMO antenna pair which can effectively cover N77, N78, N79 and 5G WLAN frequency bands divided in fifth generation mobile communication and 5.9-7.1GHz frequency bands possibly used in the future and meet various performances of MIMO antennas.
In order to achieve the purpose, the invention adopts the following technical scheme: a self-decoupling 5G ultra-wideband MIMO antenna pair, characterized by: the antenna comprises a main dielectric substrate, a side dielectric substrate, a metal ground and a plurality of antenna units; the metal ground is positioned below the main dielectric substrate and is arranged close to the main dielectric substrate, the side dielectric substrates are arranged at two sides of the main dielectric substrate, and the plurality of antenna units are symmetrically arranged on the inner side plate surface of the side dielectric substrate; the antenna unit consists of two feed units and a common radiation unit.
The two feed units are a first feed unit and a second feed unit, the first feed unit and the second feed unit have the same structure and are respectively positioned on two sides of the common radiation unit, and the first feed unit and the second feed unit carry out coupling feed on the common radiation unit; the first feed unit and the second feed unit are both in an inverted U shape, and the shared radiation unit is formed by splicing two inverted L-shaped branches with hollow-out middle parts.
The first feeding unit and the second feeding unit are connected with a feeding line on the main dielectric substrate, and the first feeding unit comprises a first vertical branch, a second vertical branch and a first horizontal branch; the first horizontal branch is positioned at the top end of the side medium substrate, one end of the first horizontal branch is connected with the upper end of the first vertical branch, the other end of the first horizontal branch is connected with the upper end of the second vertical branch, the lower end of the first vertical branch is connected with a feed line on the main medium substrate, the lower end of the second vertical branch is suspended, and a space is reserved between the second vertical branch and the main medium substrate; the second feeding unit comprises a third vertical branch, a fourth vertical branch and a second horizontal branch; the second horizontal branch is located at the top end of the side medium substrate, one end of the second horizontal branch is connected with the upper end of the third vertical branch, the other end of the second horizontal branch is connected with the upper end of the fourth vertical branch, the lower end of the third vertical branch is connected with a feed line on the main medium substrate, the lower end of the fourth vertical branch is suspended, and a space is reserved between the fourth vertical branch and the main medium substrate.
The common radiating element comprises a first vertical radiating branch, a second vertical radiating branch, a third vertical radiating branch, a fourth vertical radiating branch, a fifth vertical radiating branch, a first horizontal radiating branch, a second horizontal radiating branch and a third horizontal radiating branch; the first horizontal radiation branch is positioned at the top end of the side dielectric substrate, and a gap is reserved between the two ends of the first horizontal radiation branch and the feed units on the two sides of the first horizontal radiation branch; the upper end of the first vertical radiating branch is connected with the central position of the first horizontal radiating branch, and the lower end of the first vertical radiating branch is connected with a metal ground; the upper end of the second vertical radiation branch is connected with the right end of the first horizontal radiation branch, and the lower end of the second vertical radiation branch is connected with the right end of the second horizontal radiation branch; the left end of the second horizontal radiation branch is connected with the upper end of a third vertical radiation branch, and the lower end of the third vertical radiation branch is connected with a metal ground; the upper end of the fourth vertical radiation branch is connected with the left end of the first horizontal radiation branch, the lower end of the fourth vertical radiation branch is connected with the left end of the third horizontal radiation branch, the right end of the third horizontal radiation branch is connected with the upper end of the fifth vertical radiation branch, and the lower end of the fifth vertical radiation branch is connected with a metal ground.
The number of the antenna units is an even number more than 2.
The main dielectric substrate and the side dielectric substrate are made of FR4 material, and the metal ground and the antenna unit are made of copper.
According to the technical scheme, the beneficial effects of the invention are as follows: firstly, the antenna unit in the invention carries out coupling feeding on the common radiation unit through the feeding units at two sides, and forms a plurality of resonance frequency points by means of floor current under the condition that the common radiation unit is grounded at multiple points, thereby effectively covering N77, N78, N79 and 5G WLAN frequency bands divided in fifth generation mobile communication and 5.9 to 7.1GHz frequency bands possibly used in the future, and widening the bandwidth of the antenna unit; secondly, the isolation between the feed units can be effectively reduced by using the middle grounding point of the common radiation unit, and all indexes of the feed units meet the requirements of the MIMO antenna; thirdly, the invention has the characteristics of simple and compact structure, zero clearance and self-decoupling, and can well meet the current design requirements on the mobile terminal.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a front view of the present invention;
FIG. 3 is a schematic diagram of an antenna unit according to the present invention;
FIG. 4 is a graph of reflection coefficient versus frequency for the present invention;
FIG. 5 is a graph of transmission coefficient versus frequency for the present invention;
FIG. 6 is a graph of the overall efficiency of the present invention as a function of frequency;
fig. 7 is a graph of the envelope correlation coefficient of the present invention as a function of frequency.
Detailed Description
As shown in fig. 1 and 2, a self-decoupling 5G ultra-wideband MIMO antenna pair is characterized in that: the antenna comprises a main dielectric substrate 2, a side dielectric substrate 3, a metal ground 4 and a plurality of antenna units 1; the metal ground 4 is positioned below the main dielectric substrate 2 and is arranged close to the main dielectric substrate 2, the side dielectric substrates 3 are arranged at two sides of the main dielectric substrate 2, and the plurality of antenna units 1 are symmetrically arranged on the inner side plate surface of the side dielectric substrate 3; the antenna element 1 consists of two feed elements and a common radiating element 7.
As shown in fig. 2, the two feeding units are a first feeding unit 5 and a second feeding unit 6, the first feeding unit 5 and the second feeding unit 6 have the same structure and are respectively located at two sides of the common radiating unit 7, and the first feeding unit 5 and the second feeding unit 6 perform coupling feeding on the common radiating unit 7; first feed unit 5 and second feed unit 6 all are the shape of falling the U, sharing radiating element 7 is the concatenation of the L shape branch knot that falls of two middle fretworks and forms. The number of the antenna units 1 is an even number more than 2. The main dielectric substrate 2 and the side dielectric substrate 3 are both made of FR4 material, and the metal ground 4 and the antenna unit 1 are both made of copper.
As shown in fig. 3, the first feeding unit 5 and the second feeding unit 6 are both connected to a feeding line on the main dielectric substrate 2, the feeding line on the main dielectric substrate 2 is a fifty-ohm microstrip line, and the first feeding unit 5 includes a first vertical branch 8, a second vertical branch 9, and a first horizontal branch 10; the first horizontal branch 10 is positioned at the top end of the side medium substrate 3, one end of the first horizontal branch 10 is connected with the upper end of the first vertical branch 8, the other end of the first horizontal branch 10 is connected with the upper end of the second vertical branch 9, the lower end of the first vertical branch 8 is connected with a power feeding line on the main medium substrate 2, the lower end of the second vertical branch 9 is suspended, and a space is reserved between the second vertical branch 9 and the main medium substrate 2; the second feeding unit 6 comprises a third vertical branch 11, a fourth vertical branch 12 and a second horizontal branch 13; the second horizontal branch 13 is located at the top end of the side medium substrate 3, one end of the second horizontal branch 13 is connected with the upper end of the third vertical branch 11, the other end of the second horizontal branch 13 is connected with the upper end of the fourth vertical branch 12, the lower end of the third vertical branch 11 is connected with a power feed line on the main medium substrate 2, the lower end of the fourth vertical branch 12 is suspended, and a space is reserved between the fourth vertical branch 12 and the main medium substrate 2.
As shown in fig. 3, the common radiating element 7 includes a first vertical radiating branch 14, a second vertical radiating branch 15, a third vertical radiating branch 16, a fourth vertical radiating branch 17, a fifth vertical radiating branch 18, a first horizontal radiating branch 19, a second horizontal radiating branch 20, and a third horizontal radiating branch 21; the first horizontal radiating branch 19 is positioned at the top end of the side dielectric substrate 3, and a gap is formed between two ends of the first horizontal radiating branch 19 and the feeding units at two sides; the upper end of the first vertical radiating branch 14 is connected with the central position of the first horizontal radiating branch 19, and the lower end of the first vertical radiating branch 14 is connected with a metal ground 4; the upper end of the second vertical radiating branch 15 is connected with the right end of the first horizontal radiating branch 19, and the lower end of the second vertical radiating branch 15 is connected with the right end of the second horizontal radiating branch 20; the left end of the second horizontal radiation branch 20 is connected with the upper end of the third vertical radiation branch 16, and the lower end of the third vertical radiation branch 16 is connected with the metal ground 4; the upper end of the fourth vertical radiating branch 17 is connected with the left end of the first horizontal radiating branch 19, the lower end of the fourth vertical radiating branch 17 is connected with the left end of the third horizontal radiating branch 21, the right end of the third horizontal radiating branch 21 is connected with the upper end of the fifth vertical radiating branch 18, and the lower end of the fifth vertical radiating branch 18 is connected with the metal ground 4.
In fig. 4, the horizontal axis of the coordinates is frequency, and the vertical axis is reflection coefficient; siiI.e. the reflection coefficient of port i, which may also be referred to as return loss. The reflection coefficient is conceptually a reflection voltage/incident voltage, and represents a case where the port impedance is matched. In fig. 5, the horizontal axis of the coordinates is frequency, and the vertical axis is transmission coefficient; sijExpressed as the transmission coefficient from port j to port i when port i matches. That is, energy flows in from port i and energy measured at port j. The transmission coefficient of the port, i.e. the isolation between the antennas, is used to indicate the degree of influence of the antenna performance, i.e. the degree of mutual coupling, when each antenna is in operation. As can be seen from the S parameters in fig. 4 and 5, on the premise that the return loss is better than 6dB and the isolation between the antenna units is higher than 10dB, the self-decoupling wideband MIMO antenna can cover the 3.3GHz-7.8GHz band for the bandwidth, that is, the antenna unit 1 provided by the present invention can cover the N77, N78, N79, and 5GWLAN bands divided in the fifth generation mobile communication, and the 5.9 to 7.1GHz band that may be used in the future.
Fig. 6 shows that in the working frequency band, i.e., 3.3GHz-7.8GHz, the total efficiency of the antenna unit 1 is higher than 85%, which meets the requirement that the total efficiency of the mobile terminal antenna is higher than 40%, and the radiation performance of the antenna is good.
In fig. 7, antenna i & antenna j are represented as envelope correlation coefficients between antenna i and antenna j, that is, correlation between port i and port j, and we define the performance of recovering data when transmitting from the antenna at the transmitting end to the receiving segment as correlation. In the design of the MIMO antenna, the lower the correlation between the antennas, the independent and unaffected subchannels transmitted by the antennas are, so that a larger channel capacity can be obtained. The envelope correlation coefficient between the ultra-wideband 5G MIMO antenna pair units is less than 0.25 in the working frequency band, and the requirement that the mobile terminal equipment is less than 0.5 is met.
The main dielectric substrate 2 has a size of 150mm × 75mm × 0.8mm, the side dielectric substrate 3 has a size of 150mm × 0.8mm × 7mm, and the metal ground 4 has a size of 150mm × 75 mm.
The folded placement of the second, and third vertical radiating branches 15, 20, and 16 and the fourth, third, and fifth vertical radiating branches 17, 21, and 18 can effectively reduce the size of the antenna unit 1. The first vertical radiation branch 14, the third vertical radiation branch 16 and the fifth vertical radiation branch 18 are connected with the metal ground 4, so that the floor current can be effectively utilized, and the bandwidth of the antenna is widened.
The first vertical branch 8 and the third vertical branch 11 have a length of 5.5 to 6.5mm and a width of 0.5 to 1.5 mm; the first horizontal branch 10 and the second horizontal branch 13 have a length of 2.5 to 3.5mm and a width of 0.1 to 1 mm; the second vertical branch 9 and the fourth vertical branch 12 have a length of 2.5 to 3.5mm and a width of 0.1 to 1 mm.
The first vertical radiating branch 14 has a length of 5.5 to 6.5mm and a width of 3 to 4.5 mm; the second vertical radiating branch 15 has a length of 1.5 to 2.5mm and a width of 0.1 to 1 mm; the third vertical radiating branch 16 has a length of 4 to 5mm and a width of 0.1 to 1 mm; the fourth vertical radiating branch 17 has a length of 1.5 to 2.5mm and a width of 0.1 to 1 mm; the fifth vertical radiating branch 18 has a length of 4 to 5mm and a width of 0.1 to 1 mm; the first horizontal radiating branch 19 has a length of 15 to 25mm and a width of 0.1 to 1 mm; the second horizontal radiating branch 20 has a length of 5 to 6mm and a width of 0.1 to 1 mm; the third horizontal radiating branch 21 has a length of 5 to 6mm and a width of 0.1 to 1 mm.
The invention is designed as follows:
first, as for the selection of the feeding mode, the invention uses the feeding mode of coupling feeding, as shown in fig. 2, a fine gap is left between the first feeding unit 5 and the second feeding unit 6 and the common radiating unit 7, the principle is that the direct feeding part and the parasitic unit part are not directly connected, a capacitive gap is arranged between the two parts, and the direct feeding part excites the parasitic unit through the gap, so that the capacitive property can compensate the inductive property of the parasitic unit part caused by the increase of the length, reduce the reactive property of the parasitic unit, improve the input impedance of the antenna, and finally realize the purpose of increasing the bandwidth of the antenna.
And step two, after the selection of the feeding mode is completed, the antenna is required to have a plurality of resonant frequency points, namely the antenna has a plurality of working modes, and simultaneously, in order to realize the requirement of a curved screen, the shape of the antenna unit 1 is designed only on the side surface dielectric substrate 3: first, the first feeding unit 5 and the second feeding unit 6 are designed into an inverted U shape, and the common radiating unit 7 is designed into an inverted L shape with a hollow center, as shown in fig. 3, at the beginning of the design, the common radiating unit 7 is two separated inverted L-shaped units with hollow centers, which have two grounding points with the metal ground 4, so that the feeding unit and the radiating unit can form a plurality of coupling loop modes by utilizing floor current, and the feeding unit and the radiating unit can work in a wider frequency band range.
And thirdly, in order to reduce the size of the antenna in the mobile phone, the radiation units are fused back to form a common radiation unit 7, so that the antenna has a self-decoupling function, and the bandwidth of the antenna unit 1 can be further widened.
For the determination of the antenna size, the operation mode of the loop antenna is firstly known, and there are three common modes: 0.5 λ mode, 1 λ mode, and 1.5 λ mode, where λ represents wavelength. In the 0.5 λ mode, there is a current zero on the loop antenna, and since the sum of the currents on the loop antenna is not zero, a path to ground for the opposite current is required. At this time, the antenna ground acts as a resonating arm of the 0.5 λ mode, which is called unbalanced mode. In the 1 lambda mode, two current zeros are arranged on the loop antenna, and the currents on the two sides of the loop antenna are always reversed to meet the conditions of zero and current. The loop antenna at this time achieves self-resonance with the current on the antenna floor being much smaller than the 0.5 λ mode, which is called the balanced mode. In the 1.5 λ mode, the loop antenna has three current zeros, and the sum of the currents on the antenna is not zero, so that the antenna ground is still required as a resonant arm, and thus the 1.5 λ mode is an unbalanced mode. The current distribution rule of the loop antenna can be known as follows: the loop antenna is in an unbalanced mode when working in a 0.5 lambda odd-number multiple mode, and is in a balanced mode when working in a 0.5 lambda even-number multiple mode. Therefore, according to requirements, a plurality of working frequency points of antenna resonance are designed, the wavelength lambda is calculated according to the working frequency points, and then the corresponding size of the antenna unit 1 is calculated.
To sum up, the antenna unit 1 in the present invention performs coupling feeding on the common radiating unit 7 through the first feeding unit 5 and the first feeding unit 6 on both sides, and forms a plurality of resonant frequency points with the help of floor current under the condition that the common radiating unit 7 is grounded at multiple points, so as to effectively cover N77, N78, N79, and 5G WLAN frequency bands divided in fifth generation mobile communication, and a 5.9-7.1GHz frequency band which may be used in the future, thereby widening the bandwidth of the antenna unit; the isolation between the feed units can be effectively reduced by using the middle grounding point of the common radiation unit 7, and all indexes of the feed units meet the requirements of the MIMO antenna; the invention has the characteristics of simple and compact structure, zero clearance and self-decoupling, and can well meet the current design requirements on the mobile terminal.
Claims (6)
1. A self-decoupling 5G ultra-wideband MIMO antenna pair, characterized by: the antenna comprises a main dielectric substrate (2), a side dielectric substrate (3), a metal ground (4) and a plurality of antenna units (1); the metal ground (4) is positioned below the main dielectric substrate (2) and is arranged close to the main dielectric substrate (2), the side dielectric substrates (3) are arranged on two sides of the main dielectric substrate (2), and the antenna units (1) are symmetrically arranged on the inner side plate surface of the side dielectric substrate (3); the antenna unit (1) is composed of two feeding units and a common radiation unit (7).
2. The self-decoupling 5G ultra-wideband MIMO antenna pair of claim 1, wherein: the two feeding units are a first feeding unit (5) and a second feeding unit (6), the first feeding unit (5) and the second feeding unit (6) are identical in structure and are respectively positioned on two sides of the common radiating unit (7), and the first feeding unit (5) and the second feeding unit (6) carry out coupling feeding on the common radiating unit (7); the first feed unit (5) and the second feed unit (6) are both in an inverted U shape, and the shared radiation unit (7) is formed by splicing two inverted L-shaped branches with hollow-out middle parts.
3. The self-decoupling 5G ultra-wideband MIMO antenna pair of claim 1, wherein: the first feeding unit (5) and the second feeding unit (6) are connected with a feeding line on the main dielectric substrate (2), and the first feeding unit (5) comprises a first vertical branch (8), a second vertical branch (9) and a first horizontal branch (10); the first horizontal branch (10) is positioned at the top end of the side medium substrate (3), one end of the first horizontal branch (10) is connected with the upper end of the first vertical branch (8), the other end of the first horizontal branch (10) is connected with the upper end of the second vertical branch (9), the lower end of the first vertical branch (8) is connected with a feed line on the main medium substrate (2), the lower end of the second vertical branch (9) is suspended, and a space is reserved between the second vertical branch (9) and the main medium substrate (2); the second feeding unit (6) comprises a third vertical branch (11), a fourth vertical branch (12) and a second horizontal branch (13); the second horizontal branch (13) is located at the top end of the side medium substrate (3), one end of the second horizontal branch (13) is connected with the upper end of the third vertical branch (11), the other end of the second horizontal branch (13) is connected with the upper end of the fourth vertical branch (12), the lower end of the third vertical branch (11) is connected with a feed line on the main medium substrate (2), the lower end of the fourth vertical branch (12) is suspended, and a space is reserved between the fourth vertical branch (12) and the main medium substrate (2).
4. The self-decoupling 5G ultra-wideband MIMO antenna pair of claim 1, wherein: the common radiation unit (7) comprises a first vertical radiation branch (14), a second vertical radiation branch (15), a third vertical radiation branch (16), a fourth vertical radiation branch (17), a fifth vertical radiation branch (18), a first horizontal radiation branch (19), a second horizontal radiation branch (20) and a third horizontal radiation branch (21); the first horizontal radiating branch (19) is positioned at the top end of the side dielectric substrate (3), and a gap is reserved between the two ends of the first horizontal radiating branch (19) and the feeding units on the two sides; the upper end of the first vertical radiation branch (14) is connected with the central position of the first horizontal radiation branch (19), and the lower end of the first vertical radiation branch (14) is connected with a metal ground (4); the upper end of the second vertical radiation branch (15) is connected with the right end of the first horizontal radiation branch (19), and the lower end of the second vertical radiation branch (15) is connected with the right end of the second horizontal radiation branch (20); the left end of the second horizontal radiation branch (20) is connected with the upper end of a third vertical radiation branch (16), and the lower end of the third vertical radiation branch (16) is connected with a metal ground (4); the upper end of the fourth vertical radiation branch (17) is connected with the left end of the first horizontal radiation branch (19), the lower end of the fourth vertical radiation branch (17) is connected with the left end of the third horizontal radiation branch (21), the right end of the third horizontal radiation branch (21) is connected with the upper end of the fifth vertical radiation branch (18), and the lower end of the fifth vertical radiation branch (18) is connected with the metal ground (4).
5. The self-decoupling 5G ultra-wideband MIMO antenna pair of claim 1, wherein: the number of the antenna units (1) is an even number more than 2.
6. The self-decoupling 5G ultra-wideband MIMO antenna pair of claim 1, wherein: the main dielectric substrate (2) and the side dielectric substrate (3) are both made of FR4 material, and the metal ground (4) and the antenna unit (1) are both made of copper.
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| CN116151038A (en) * | 2023-04-18 | 2023-05-23 | 安徽大学 | Analysis method of circular polarization MIMO microstrip antenna array self-decoupling technology |
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