CN113851831A - Miniaturized tightly-arranged MIMO antenna of 5G mobile terminal based on decoupling of patch capacitor - Google Patents
Miniaturized tightly-arranged MIMO antenna of 5G mobile terminal based on decoupling of patch capacitor Download PDFInfo
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- CN113851831A CN113851831A CN202110986746.4A CN202110986746A CN113851831A CN 113851831 A CN113851831 A CN 113851831A CN 202110986746 A CN202110986746 A CN 202110986746A CN 113851831 A CN113851831 A CN 113851831A
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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
- H01Q1/521—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure reducing the coupling between adjacent antennas
- H01Q1/523—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure reducing the coupling between adjacent antennas between antennas of an array
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/0006—Particular feeding systems
- H01Q21/0075—Stripline fed arrays
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/06—Arrays of individually energised antenna units similarly polarised and spaced apart
- H01Q21/061—Two dimensional planar arrays
- H01Q21/065—Patch antenna array
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Abstract
The invention discloses a 5G mobile terminal miniaturized tightly-arranged MIMO antenna based on lumped patch capacitor decoupling, which is suitable for the field of mobile communication and comprises the following components: the system comprises a dielectric substrate, a system metal floor, two resonance gaps for increasing isolation on the floor and four tightly-arranged antenna modules; the four antenna modules have the same physical size, are positioned in the same plane of the metal floor and are in mirror symmetry; each antenna module comprises a rectangular patch, two metal strips, five patch capacitors, two feed microstrip lines and two corresponding feed ports; in addition, an additional decoupling structure unit is introduced into the unit, and two floor gaps are introduced into the middle part of the long edge of the floor to be used as resonators, so that the aim of improving the isolation between the inside of the antenna and the antenna module is fulfilled. The invention has the advantages of simple structure, high efficiency, miniaturization, convenient processing, low manufacturing cost and the like, thereby having good application prospect in the 5G mobile terminal.
Description
The technical field is as follows:
the invention relates to MIMO antenna design, in particular to a miniaturized tightly-arranged MIMO antenna based on a 5G mobile terminal with a patch capacitor decoupling function, and belongs to the field of mobile communication.
Background art:
MIMO is an effective technique for improving channel capacity and is considered as one of key techniques of a fifth generation (5G) mobile communication system. However, mutual coupling between MIMO antenna elements may affect orthogonality between different data streams, thereby reducing channel capacity of the MIMO system. In order to mitigate unwanted mutual coupling, various decoupling techniques have been extensively studied in recent years, such as electromagnetic bandgap, neutral line, parasitic decoupling element, decoupling network, LC tank with resonant tank, strip or lumped components.
In a 5G mobile terminal, approximately 8 MIMO antenna elements operate in a frequency spectrum lower than 6GHz, should be accommodated in a limited-size environment, and coexist with 2G/3G/4G antennas. However, the space occupied by the MIMO antenna in the 5G mobile terminal is too large to be suitable for an environment where the actual size is limited.
In order to solve the problems and adapt to the size-limited environment in the smart phone, five metal strips are flatly and vertically placed and form distributed capacitors with upper rectangular patches to be integrated together to serve as an antenna module, and the overall size of the antenna is reduced through the symmetrical metal strips. On the basis of guaranteeing the comprehensive performance of the antenna, designing a MIMO miniaturized antenna meeting the practical application requirements is a problem to be researched and solved urgently.
Meanwhile, the MIMO miniaturized antenna with planar design is also a hot spot, and the antenna has the advantages of simple structure, space saving, low cost, novelty and practicability.
The invention content is as follows:
the invention provides a small-sized tightly-arranged MIMO antenna based on a 5G mobile terminal with a patch capacitor decoupling function, which aims to solve the problems in the prior art.
The technical scheme adopted by the invention is as follows: A5G mobile terminal miniaturization tightly-arranged MIMO antenna based on patch capacitance decoupling comprises a dielectric substrate 5 and a system metal floor 6 printed on the upper surface of the dielectric substrate 5, wherein a first antenna module 1, a second antenna module 2, a third antenna module 3, a fourth antenna module 4, a first floor gap 1j-1 and a second floor gap 1j-2 which are identical in structure and size and are in mirror symmetry are printed on the dielectric substrate 5, the first antenna module 1 comprises a rectangular patch 1d, a first patch capacitor 1a-1, a second patch capacitor 1a-2, a third patch capacitor 1b-1, a fourth patch capacitor 1b-2, a fifth patch capacitor 1c, a first metal strip 1e-1, a second metal strip 1e-2, a first feed microstrip line 1i-1 and a second feed microstrip line 1i-2, the first metal strip 1e-1 and the second metal strip 1e-2 are both connected with a system metal floor 6, the first metal strip 1e-1 is connected with a first patch capacitor 1a-1, the second metal strip 1e-2 is connected with a second patch capacitor 1a-2, the first feed microstrip line 1i-1 and the second feed microstrip line 1i-2 are positioned between the first metal strip 1e-1 and the second metal strip 1e-2, the first feed microstrip line 1i-1 and the second feed microstrip line 1i-2 are respectively connected with a first feed port 1f and a second feed port 1g, the first feed microstrip line 1i-1 is connected with a third patch capacitor 1b-1, the second feed microstrip line 1i-2 is connected with a fourth patch capacitor 1b-2, an additional decoupling unit 1h formed by a metal strip is also introduced in the middle of the antenna module 1.
Further, the capacitance values of the first patch capacitor 1a-1, the second patch capacitor 1a-2, the third patch capacitor 1b-1, the fourth patch capacitor 1b-2 and the fifth patch capacitor 1c are different.
Further, the first antenna module 1, the second antenna module 2, the third antenna module 3 and the fourth antenna module 4 are all mirror-symmetrical about two perpendicular bisectors of the dielectric substrate 5, and all have dimensions of 16 × 6mm2。
Further, the length of the first rectangular patch 1d is 16mm, the width thereof is 0.5mm, the lengths of the first metal strip 1e-1 and the second metal strip 1e-2 are 4.5mm, the widths thereof are 0.8mm, the lengths of the first patch capacitor 1a-1 and the second patch capacitor 1a-2 are 1mm, the widths thereof are 0.8mm, and the capacitance value thereof is 0.1 pF.
Furthermore, one end of the third patch capacitor 1b-1 and one end of the fourth patch capacitor 1b-2 are welded on the rectangular patch 1d, the other end of the third patch capacitor is welded on the first feed microstrip line 1i-1 and the second feed microstrip line 1i-2, the length of the first feed microstrip line 1i-1 and the length of the second feed microstrip line 1i-2 are 4mm, the width of the first feed microstrip line 1i-1 are 0.8mm, and the capacitance of the third patch capacitor 1b-1 and the capacitance of the fourth patch capacitor 1b-2 are 0.5 pF.
Further, the first feeding port 1f and the second feeding port 1g are connected to the first feeding microstrip line 1i-1 and the second feeding microstrip line 1i-2 for feeding.
Furthermore, one end of the additional decoupling structure unit 1h is connected with the system metal floor 6, the other end of the additional decoupling structure unit 1h is welded with the fifth patch capacitor 1c, the length of the additional decoupling structure unit 1h is 4.5mm, the width of the additional decoupling structure unit 1h is 0.8mm, and the fifth step is that the first floor gap 1j-1 and the second floor gap 1j-2 are formed by digging two bent opening type gaps with the width of 0.5mm on the system metal floor 6.
Further, the first antenna module 1, the second antenna module 2, the third antenna module 3, and the fourth antenna module 4 are printed on the dielectric substrate 5 on the same plane as the system metal floor 6.
The invention has the following beneficial effects:
(1) the size of the antenna module is very small, only 16 x 6mm2The free space volume occupied by the MIMO antenna array can be effectively reduced.
(2) The isolation degree of the port between the two antenna units is high, and the isolation degree of 24dB is realized in the frequency band of 3400-3600 MHz.
(3) The size of the decoupling circuit is small and is equivalent to a distributed capacitor, and the manufacturing cost of the antenna and the complexity of the decoupling circuit are reduced.
Description of the drawings:
fig. 1 is a three-dimensional structural view of a MIMO antenna of the present invention.
Fig. 2 is a plan structural view of a first antenna module in the MIMO antenna of the present invention.
Fig. 3 is an S-parameter curve of a MIMO antenna of the present invention.
Fig. 4 shows the isolation between different antenna modules in the MIMO antenna according to the present invention.
Fig. 5 shows the radiation efficiency when different ports in the MIMO antenna are excited.
The specific implementation mode is as follows:
the invention will be further described with reference to the accompanying drawings.
The invention relates to a 5G mobile terminal miniaturized tightly-arranged MIMO antenna based on patch capacitor decoupling, which comprises a dielectric substrate 5 and a system metal floor 6 printed on the upper surface of the dielectric substrate 5, wherein a first antenna module 1, a second antenna module 2, a third antenna module 3, a fourth antenna module 4, a first floor gap 1j-1 and a second floor gap 1j-2 which have the same structure and size and are in mirror symmetry are printed on the dielectric substrate 5, the first antenna module 1 comprises a rectangular patch 1d, a first patch capacitor 1a-1, a second patch capacitor 1a-2, a third patch capacitor 1b-1, a fourth patch capacitor 1b-2, a fifth patch capacitor 1c, a first metal strip 1e-1, a second metal strip 1e-2, a first feed microstrip line 1i-1 and a second feed microstrip line 1i-2, the capacitance values of the first patch capacitor 1a-1, the second patch capacitor 1a-2, the third patch capacitor 1b-1, the fourth patch capacitor 1b-2 and the fifth patch capacitor 1c are different. The first metal strip 1e-1 and the second metal strip 1e-2 are both connected with the system metal floor 6, the first metal strip 1e-1 is connected with the first patch capacitor 1a-1, and the second metal strip 1e-2 is connected with the second patch capacitor 1 a-2. The first feed microstrip line 1i-1 and the second feed microstrip line 1i-2 are located between the first metal strip 1e-1 and the second metal strip 1e-2, the first feed microstrip line 1i-1 and the second feed microstrip line 1i-2 are respectively connected with the first feed port 1f and the second feed port 1g, the first feed microstrip line 1i-1 is connected with the third patch capacitor 1b-1, and the second feed microstrip line 1i-2 is connected with the fourth patch capacitor 1 b-2. An additional decoupling structural unit 1h formed by a metal strip is also introduced in the middle of the antenna module 1.
The first antenna module 1, the second antenna module 2, the third antenna module 3 and the fourth antenna module 4 have the same physical structure, and the sizes of the first antenna module, the second antenna module, the third antenna module and the fourth antenna module are all 16-6 mm2。
The thickness of the dielectric substrate 5 is 0.8mm, and the upper surface of the dielectric substrate 5 is the system metal floor 6 and the four antenna modules.
The length of a rectangular patch 1d on the antenna module 1 is 16mm, the width of the rectangular patch 1d is 0.5mm, two ends of the rectangular patch 1d are connected with one ends of a first metal strip 1e-1 and a second metal strip 1e-2 through welding the first patch capacitor 1a-1 and the second patch capacitor 1a-2, the other ends of the first metal strip 1e-1 and the second metal strip 1e-2 are connected with a system metal floor 6, the lengths of the first metal strip 1e-1 and the second metal strip 1e-2 are 4.5mm, the widths of the first metal strip 1e-1 and the second metal strip 1e-2 are 0.8mm, the lengths of the first patch capacitor 1a-1 and the second patch capacitor 1a-2 are 1mm, the widths of the first patch capacitor 1a-1 and the second patch capacitor 1a-2 are 0.8mm, and the capacitance value of the first patch capacitor 1pF is 0.1 pF.
One end of each of the third patch capacitor 1b-1 and the fourth patch capacitor 1b-2 is welded on the rectangular patch 1d, the other end of each of the third patch capacitor 1b-1 and the fourth patch capacitor 1b-2 is welded on the first feed microstrip line 1i-1 and the second feed microstrip line 1i-2, the first feed microstrip line 1i-1 and the second feed microstrip line 1i-2 are 4mm in length and 0.8mm in width, and the capacitance values of the third patch capacitor 1b-1 and the fourth patch capacitor 1b-2 are 0.5 pF.
The first feed port 1f and the second feed port 1g are respectively connected with the first feed microstrip line 1i-1 and the second feed microstrip line 1i-2 for feeding.
An additional decoupling structure unit 1h in the middle of the antenna module 1 is connected with a system metal floor 6 at one end, and is welded with a fifth patch capacitor 1c at the other end, wherein the additional decoupling structure unit 1h is 4.5mm long and 0.8mm wide, and the capacitance value of the fifth patch capacitor 1c is 0.4 pF. The additional decoupling metal strips 1h improve the isolation inside the cell.
The first floor gap 1j-1 and the second floor gap 1j-2 are formed by digging two bent open-type slits in the shape of a square with a width of 0.5mm in the system metal floor 6. Effectively cut off the current between the adjacent ports, thereby achieving the purpose of improving the isolation between the ports.
The first antenna module 1, the second antenna module 2, the third antenna module 3, and the fourth antenna module 4 are printed on the dielectric substrate 5 on the same plane as the system metal floor 6.
The following is a detailed description of an embodiment of a MIMO antenna covering the 3.5GHz band in 5G Sub-6GHz applications:
the three-dimensional structure diagram of the MIMO antenna of the present invention is shown in fig. 1,the antenna comprises a dielectric substrate 5 and a system metal floor 6 printed on the upper surface of the dielectric substrate 5, wherein a first antenna module 1, a second antenna module 2, a third antenna module 3 and a fourth antenna module 4 which are identical in structure and size and are in mirror symmetry are printed on the dielectric substrate 5, and two first floor gaps 1j-1 and two second floor gaps 1j-2 are dug out. The lowest part is an FR4 medium substrate 5 (epsilon)r4.4, tan delta 0.02), volume 150 × 75 × 0.8mm3. The upper surface of the FR4 dielectric substrate 5 is a system metal floor 6 (150X 63 mm)2) Two floor gaps are introduced into the middle part of the long edge of the metal floor 6 of the system to be used as resonators, so that the aim of improving the isolation between the inside of the antenna and the antenna module is fulfilled.
On the dielectric substrate 5, the dimension is 16X 6mm2The first antenna module 1 comprises the top rectangular patch, two ends of the rectangular patch are connected with one ends of the first metal strip 1e-1 and the second metal strip 1e-2 through the welding patch capacitors, and the other ends of the first metal strip 1e-1 and the second metal strip 1e-2 are connected with the system metal floor.
One end of the third patch capacitor 1b-1 and one end of the fourth patch capacitor 1b-2 are welded on the rectangular patch, and the other end of the third patch capacitor is welded on the first feed microstrip line 1i-1 and the second feed microstrip line 1 i-2. One end of the middle additional decoupling structure unit 1h is connected with a system metal floor, the other end of the middle additional decoupling structure unit is welded with the fifth patch capacitor 1c, and the isolation degree in the unit is improved through an additional decoupling metal strip.
The first floor gap 1j-1 and the second floor gap 1j-2 are formed by digging two bent open-type gaps with the width of 0.5mm on the metal floor of the system. Effectively cut off the current between the adjacent ports, thereby achieving the purpose of improving the isolation between the ports.
The central operating frequency of this embodiment is selected to be 3.5GHz, the operating bandwidth is 3400-.
Fig. 2 is a plan structure diagram of a first antenna module in the MIMO antenna of this embodiment.
Fig. 3 is an S-parameter curve of the MIMO antenna of the present embodiment. Both sub-antenna elements resonate at around 3.5 GHz. S11 is the reflection coefficient of the first feed port 1f with a-6 dB bandwidth of about 14.3%, and S22 is the reflection coefficient of the second feed port 1g with a-6 dB bandwidth of about 14.9%. The bandwidth of the coincidence of the two ports covers the 3400-3600MHz frequency band. Within this band, the isolation of the two ports is represented by S12, reaching 24dB at the frequency of 3.5 GHz.
Fig. 4 shows S parameters between different antenna modules in the MIMO antenna according to the present invention. The isolation between any two antenna modules is above 10.5 dB.
Fig. 5 shows the total efficiency of the MIMO antenna of the present embodiment. In the frequency band range of 3400-3600MHz, the total efficiency when the first feeding port 1f is excited reaches 82%, and the total efficiency when the second feeding port 1g is excited is better than 69%.
The antenna module with the planar design is used in the MIMO antenna, the structure is very simple, and the MIMO antenna has the advantages of high efficiency, miniaturization, convenience in processing, low manufacturing cost and the like, so that the MIMO antenna has a good application prospect in a 5G mobile terminal.
The foregoing is only a preferred embodiment of this invention and it should be noted that modifications can be made by those skilled in the art without departing from the principle of the invention and these modifications should also be considered as the protection scope of the invention.
Claims (9)
1. The utility model provides a miniaturized tight MIMO antenna of arranging of 5G removal end based on decoupling zero of paster electric capacity which characterized in that: the antenna comprises a dielectric substrate (5) and a system metal floor (6) printed on the upper surface of the dielectric substrate (5), wherein a first antenna module (1), a second antenna module (2), a third antenna module (3), a fourth antenna module (4), a first floor gap (1j-1) and a second floor gap (1j-2) which are identical in structure and size and are in mirror symmetry are printed on the dielectric substrate (5), the first antenna module (1) comprises a rectangular patch (1d), a first patch capacitor (1a-1), a second patch capacitor (1a-2), a third patch capacitor (1b-1), a fourth patch capacitor (1b-2), a fifth patch capacitor (1c), a first metal strip (1e-1), a second metal strip (1e-2), a first feed microstrip line (1i-1) and a second feed microstrip line (1i-2), the first metal strip (1e-1) and the second metal strip (1e-2) are connected with a system metal floor (6), the first metal strip (1e-1) is connected with a first patch capacitor (1a-1), the second metal strip (1e-2) is connected with a second patch capacitor (1a-2), the first feed microstrip line (1i-1) and the second feed microstrip line (1i-2) are positioned between the first metal strip (1e-1) and the second metal strip (1e-2), the first feed microstrip line (1i-1) and the second feed microstrip line (1i-2) are respectively connected with a first feed port (1f) and a second feed port (1g), the first feed microstrip line (1i-1) is connected with a third patch capacitor (1b-1), the second feed microstrip line (1i-2) is connected with the fourth patch capacitor (1b-2), and an additional decoupling structural unit (1h) formed by a metal strip is introduced into the middle of the antenna module (1).
2. The patch capacitance decoupling based 5G mobile terminal miniaturized tightly-arranged MIMO antenna of claim 1, wherein: the capacitance values of the first patch capacitor (1a-1), the second patch capacitor (1a-2), the third patch capacitor (1b-1), the fourth patch capacitor (1b-2) and the fifth patch capacitor (1c) are different.
3. The patch capacitance decoupling based 5G mobile terminal miniaturized tightly-arranged MIMO antenna of claim 1, wherein: the first antenna module (1), the second antenna module (2), the third antenna module (3) and the fourth antenna module (4) are in mirror symmetry with respect to two perpendicular bisectors of the dielectric substrate (5), and the sizes of the first antenna module, the second antenna module, the third antenna module and the fourth antenna module are 16-6 mm2。
4. The patch capacitance decoupling based 5G mobile terminal miniaturized tightly-arranged MIMO antenna of claim 1, wherein: first rectangle paster (1d) is 16mm long, and wide being 0.5mm, the length of first metal strip (1e-1) and second metal strip (1e-2) is 4.5mm, and wide being 0.8mm, and the length of first paster electric capacity (1a-1) and second paster electric capacity (1a-2) is 1mm, and wide being 0.8mm, and the capacitance value is 0.1 pF.
5. The patch capacitance decoupling based 5G mobile terminal miniaturized tightly-arranged MIMO antenna of claim 1, wherein: one end of the third patch capacitor (1b-1) and one end of the fourth patch capacitor ((1b-2) are welded on the rectangular patch (1d), the other end of the third patch capacitor (1b-1) and the other end of the fourth patch capacitor (1b-2) are welded on the first feed microstrip line (1i-1) and the second feed microstrip line (1i-2), the length of the first feed microstrip line (1i-1) and the length of the second feed microstrip line (1i-2) are 4mm, the width of the first feed microstrip line (1i-1) and the width of the second feed microstrip line (1i-2) are 0.8mm, and the capacitance values of the third patch capacitor (1b-1) and the fourth patch capacitor ((1b-2) are 0.5 pF.
6. The patch capacitance decoupling based 5G mobile terminal miniaturized tightly-arranged MIMO antenna of claim 1, wherein: the first feed port (1f) and the second feed port (1g) are connected with the first feed microstrip line (1i-1) and the second feed microstrip line (1i-2) for feeding.
7. The patch capacitance decoupling based 5G mobile terminal miniaturized tightly-arranged MIMO antenna of claim 1, wherein: one end of the additional decoupling structure unit (1h) is connected with the system metal floor (6), the other end of the additional decoupling structure unit is welded with the fifth patch capacitor (1c), the length of the additional decoupling structure unit (1h) is 4.5mm, the width of the additional decoupling structure unit is 0.8mm, and the capacitance value of the fifth patch capacitor (1c) is 0.4 pF.
8. The patch capacitance decoupling based 5G mobile terminal miniaturized tightly-arranged MIMO antenna of claim 1, wherein: the first floor gap (1j-1) and the second floor gap (1j-2) are formed by digging two bent open-type gaps with the width of 0.5mm on a system metal floor (6).
9. The patch capacitance decoupling based 5G mobile terminal miniaturized tightly-arranged MIMO antenna of claim 1, wherein: the first antenna module (1), the second antenna module (2), the third antenna module (3) and the fourth antenna module (4) are printed on the dielectric substrate (5) on the same plane with the system metal floor (6).
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| WO2012088837A1 (en) * | 2010-12-27 | 2012-07-05 | 中兴通讯股份有限公司 | Array antenna of mobile terminal and implementing method thereof |
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