CN115241659A - High-isolation broadband tri-polarization MIMO antenna - Google Patents
High-isolation broadband tri-polarization MIMO antenna Download PDFInfo
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- 238000002955 isolation Methods 0.000 title claims abstract description 24
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- 239000002184 metal Substances 0.000 claims description 86
- 230000005855 radiation Effects 0.000 claims description 38
- 239000000463 material Substances 0.000 claims 1
- 230000010287 polarization Effects 0.000 abstract description 15
- 239000003990 capacitor Substances 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 5
- 238000004088 simulation Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 238000004364 calculation method Methods 0.000 description 3
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- 238000004891 communication Methods 0.000 description 2
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- 238000005388 cross polarization Methods 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/24—Combinations of antenna units polarised in different directions for transmitting or receiving circularly and elliptically polarised waves or waves linearly polarised in any direction
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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
- H01Q1/52—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
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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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q25/00—Antennas or antenna systems providing at least two radiating patterns
- H01Q25/04—Multimode antennas
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q7/00—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
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Abstract
The invention discloses a high-isolation broadband tri-polarization MIMO antenna which comprises a dipole antenna, a square dielectric substrate, an annular antenna unit, a circular dielectric substrate, a feed network, a first sawtooth-shaped balun and a second sawtooth-shaped balun, wherein the feed network is fixed on the outer wall of the bottom end of the circular dielectric substrate; the invention has MIMO antenna with three polarization modes; the capacitor is formed between the loop antenna and the dipole antenna, the size of the capacitor is reasonably adjusted, the antenna can obtain a wider working bandwidth, the relative bandwidth is 50%, the isolation between ports is higher than 28dB, and compared with the same type of triple-polarization MIMO antenna, the antenna has a wider working frequency band and a higher port isolation.
Description
Technical Field
The invention relates to the technical field of antennas, in particular to a high-isolation broadband triple-polarization MIMO antenna.
Background
The multiple input multiple output is a technology for improving the capacity and the spectrum utilization rate of a communication system at present; the MIMO technology is to use multiple antennas at the transmitting and receiving ends to transmit and receive signals simultaneously, thereby improving transmission efficiency and suppressing multipath fading; based on the MIMO technology, when the multi-polarization antenna is in a complex multipath environment, the channel capacity of wireless communication can be improved, and when the isolation between different polarization directions is high, each branch can be regarded as an independent transceiving channel; however, the existing polarization diversity technology of the antenna mainly adopts a dual-polarized antenna, but the polarization matching efficiency of the dual-polarized antenna is not stable; research shows that with the increase of the number of antennas, the capacity of the MIMO antenna system is increased, and the MIMO antenna system with multi-polarization characteristic is widely concerned at present; therefore, the research on the high-performance three-polarization antenna has very high practical application value; at present, the research of the three-polarization antenna is focused on realizing three polarizations, and the subsequent narrow bandwidth, poor isolation and large size of the antenna are still to be solved.
Disclosure of Invention
The present invention solves the above-mentioned problems in the prior art by providing a high-isolation wideband triple-polarized MIMO antenna.
In order to achieve the purpose, the invention adopts the following technical scheme:
a high-isolation broadband triple-polarization MIMO antenna comprises a dipole antenna, a square dielectric substrate, an annular antenna unit, a circular dielectric substrate, a feed network, a first sawtooth-shaped balun and a second sawtooth-shaped balun, wherein the feed network is fixed on the outer wall of the bottom end of the circular dielectric substrate, the annular antenna unit is fixed on the outer wall of the top end of the circular dielectric substrate, the first sawtooth-shaped balun is fixed on the outer wall of the top end of the circular dielectric substrate, the second sawtooth-shaped balun is fixed on the outer wall, located on one side of the first sawtooth-shaped balun, of the circular dielectric substrate, the square dielectric substrate is installed on the outer wall of the top end of the first sawtooth-shaped balun, and the dipole antenna is fixed on the outer wall of the top end of the square dielectric substrate;
the feed network comprises a first wiring port, a first output port, a second output port, a third output port, a fourth output port, an ohmic resistor, a first dielectric plate, a first metal floor and a circuit, wherein the first dielectric plate is fixedly connected to the outer wall of the bottom end of the circular dielectric substrate, the first metal floor is fixedly connected to the outer wall of the bottom end of the first dielectric plate, the circuit is installed on the inner wall of the bottom end of the first metal floor, the first wiring port is formed in the inner wall of one side of the first dielectric plate, the electrical input end of the first wiring port is electrically connected with the electrical output shaft of the circuit, the ohmic resistor is installed on the inner wall, located between the circuits, of the first metal floor, the first output port is formed in the inner wall of one side of the circular dielectric substrate, the second output port is formed in the inner wall of one side of the circular dielectric substrate, the third output port is formed in the inner wall of one side of the circular dielectric substrate, and the fourth output port is formed in the inner wall of one side of the circular dielectric substrate.
As a further scheme of the invention: the loop antenna unit comprises a first metal sheet, a second metal sheet, a third metal sheet, a first metal column, a second metal column, a third metal column and a fourth metal column, wherein the first metal column is installed on the outer wall of the top end of the circuit corresponding to a first output port, the second metal column is installed on the outer wall of the top end of the circuit corresponding to a second output port, the third metal column is installed on the outer wall of the top end of the circuit corresponding to a third output port, the fourth metal column is installed on the outer wall of the top end of the circuit corresponding to a fourth output port, the third metal sheet is fixedly connected to the outer walls of the top ends of the first metal column, the second metal column, the third metal column and the fourth metal column respectively, the second metal sheet is fixedly connected to the outer wall of the top end of the third metal sheet, and the first metal sheet is fixedly connected to the outer wall of one side of the second metal sheet.
As a further scheme of the invention: the first zigzag balun comprises a second dielectric plate, a second metal floor, a sawtooth structure, a first open slot, a first microstrip line, a second microstrip line, a third microstrip line, a fourth microstrip line, a second wiring port, a fifth microstrip line, a sixth microstrip line, a seventh microstrip line, an eighth microstrip line, a second open slot and a third wiring port, the second dielectric plate is fixedly connected to the outer wall of the top end of the circular dielectric substrate, the second metal floor is installed on the inner wall of one side of the second dielectric plate, the sawtooth structure is distributed on the inner wall of one side of the second metal floor, the first open slot is formed in the inner wall of the top end of the second dielectric plate, the second wiring port is installed on the inner wall of the bottom end of the second dielectric plate, the fourth microstrip line is installed on the inner wall of one side of the second wiring port, the third microstrip line is electrically connected to the outer wall of the top end of the third microstrip line, the first microstrip line is electrically connected to the outer wall of the bottom end of the second microstrip line, the sixth microstrip line is installed on the inner wall of the second zigzag balun, the inner wall of one side of the second microstrip line is connected to the bottom end of the seventh microstrip line, the eighth microstrip line is connected to the outer wall of the third microstrip line, and the eighth microstrip line is connected to the third microstrip line.
As a further scheme of the invention: the dipole antenna comprises a fan-shaped radiation patch and annular branches, the fan-shaped radiation patch is distributed and mounted on the outer wall of the top end of the square medium substrate, and the annular branches are symmetrically and fixedly mounted on the outer wall of one side of the fan-shaped radiation patch.
As a further scheme of the invention: the loop antenna unit generates vertical polarization electromagnetic waves, and the dipole antenna positioned in the center of the loop antenna array generates horizontal +/-45-degree polarization electromagnetic waves, so that the far-field radiation characteristic of triple polarization is realized.
As a further scheme of the invention: the distance between the antenna arms of the dipole antenna is 2.2mm.
As a further scheme of the invention: the square dielectric substrate and the first dielectric plate are made of FR4 plates with the thickness of 0.8mm and the dielectric constant of 4.5.
As a further scheme of the invention: the circular dielectric substrate is made of Rogers5880 plates with the thickness of 0.762mm and the dielectric constant of 2.2.
The invention has the beneficial effects that: 1. the invention adopts four loop antenna units and a bipolar dipole antenna to design an MIMO antenna with three polarization modes; the capacitor is formed between the loop antenna and the dipole antenna, the size of the capacitor is reasonably adjusted, the antenna can obtain a wider working bandwidth, the relative bandwidth is 50%, the isolation between ports is higher than 28dB, and compared with the same type of triple polarized MIMO antenna, the loop antenna has a wider working frequency band and a higher port isolation.
2. The grounding loop antenna adopted by the invention has the advantages that the grounding end of the loop antenna extends to the lower part of the bipolar antenna, so that the size of the antenna is reduced, and the miniaturization of the antenna is more facilitated.
3. The feed network and the antenna unit are integrated, and compared with the design that the feed network and the antenna unit are separated, the size of the antenna is reduced, and meanwhile, the stability of the horizontal all-directional radiation performance of the antenna is improved.
Drawings
FIG. 1 is a schematic overall perspective view of the present invention;
FIG. 2 is a schematic diagram of a loop antenna unit according to the present invention;
FIG. 3 is a schematic diagram of the feed network structure of the present invention;
FIG. 4 is a schematic front view of a first saw-toothed balun of the present invention;
FIG. 5 is a schematic diagram of a rear view of a first saw-toothed balun structure according to the present invention;
FIG. 6 is a schematic structural diagram of a second saw-tooth balun of the present invention;
fig. 7 is a schematic diagram of a dipole antenna of the present invention;
FIG. 8 is a graph of the return loss versus frequency simulation results for various ports of the present invention;
FIG. 9 is a graph of simulation results for port isolation of the present invention;
FIG. 10 is a first far field radiation pattern of the present invention;
FIG. 11 is a second far field radiation pattern of the present invention;
FIG. 12 is a third far field radiation pattern of the present invention;
FIG. 13 is a fourth far field radiation pattern of the present invention;
FIG. 14 is a fifth far-field radiation pattern of the present invention;
FIG. 15 is a sixth far field radiation pattern of the present invention;
FIG. 16 is a seventh far field radiation pattern of the present invention;
FIG. 17 is an eighth far field radiation pattern of the present invention;
FIG. 18 is a ninth far field radiation pattern of the present invention;
FIG. 19 is a tenth far field radiation pattern of the present invention;
FIG. 20 is an eleventh far field radiation pattern of the present invention;
FIG. 21 is a twelfth far field radiation pattern of the present invention;
illustration of the drawings: 1. a dipole antenna; 2. a square dielectric substrate; 3. a loop antenna unit; 4. a circular dielectric substrate; 5. a feed network; 6. a first saw-toothed balun; 7. a second saw-toothed balun; 101. a fan-shaped radiation patch; 102. a ring-shaped branch knot; 301. a first metal sheet; 302. a second metal sheet; 303. a third metal foil; 304. a first metal pillar; 305. A second metal pillar; 306. a third metal pillar; 307. a fourth metal pillar; 501. a first wiring port; 502. a first output port; 503. a second output port; 504. a third output port; 505. a fourth output port; 506. a 100 ohm resistance; 507. a first dielectric plate; 508. a first metal floor; 509. a circuit; 601. a second dielectric plate; 602. a second metal floor; 603. a sawtooth structure; 604. a first open slot; 605. a first microstrip line; 606. A second microstrip line; 607. a third microstrip line; 608. a fourth microstrip line; 609. a second wiring port; 6010. a fifth microstrip line; 6011. a sixth microstrip line; 6012. a seventh microstrip line; 6013. an eighth microstrip line; 6014. a second open slot; 6015. and a third connection port.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is to be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Specific examples are given below.
Referring to fig. 1-21, a high-isolation broadband triple-polarization MIMO antenna includes a dipole antenna 1, a square dielectric substrate 2, a loop antenna unit 3, a circular dielectric substrate 4, a feeding network 5, a first sawtooth-shaped balun 6 and a second sawtooth-shaped balun 7, where the feeding network 5 is fixed on the outer wall of the bottom end of the circular dielectric substrate 4, the loop antenna unit 3 is fixed on the outer wall of the top end of the circular dielectric substrate 4, the first sawtooth-shaped balun 6 is fixed on the outer wall of the top end of the circular dielectric substrate 4, the second sawtooth-shaped balun 7 is fixed on the outer wall of the circular dielectric substrate 4 on one side of the first sawtooth-shaped balun 6, the square dielectric substrate 2 is installed on the outer wall of the top end of the first sawtooth-shaped balun 6, and the dipole antenna 1 is fixed on the outer wall of the top end of the square dielectric substrate 2; the loop antenna unit 3 generates vertical polarization electromagnetic waves, and the dipole antenna 1 positioned in the center of the loop antenna array generates horizontal +/-45-degree polarization electromagnetic waves, so that the far-field radiation characteristic of triple polarization is realized; the round dielectric substrate 4 is made of Rogers5880 plates with the thickness of 0.762mm and the dielectric constant of 2.2, so that the round dielectric substrate 4 is ensured to carry out electric signal transmission, and the signal transmission effect is improved;
the feed network 5 comprises a first wiring port 501, a first output port 502, a second output port 503, a third output port 504, a fourth output port 505, a 100-ohm resistor 506, a first dielectric plate 507, a first metal floor 508 and a circuit 509, wherein the outer wall of the bottom end of the circular dielectric substrate 4 is fixedly connected with the first dielectric plate 507, the outer wall of the bottom end of the first dielectric plate 507 is fixedly connected with the first metal floor 508, the inner wall of the bottom end of the first metal floor 508 is provided with the circuit 509, the inner wall of one side of the first dielectric plate 507 is provided with the first wiring port 501, the electrical input end of the first wiring port 501 is electrically connected with the electrical output shaft of the circuit 509, the inner wall of the first metal floor 508 between the circuit 509 is provided with the 100-ohm resistor 506, the inner wall of one side of the circular dielectric substrate 4 is provided with the first output port 502, the inner wall of one side of the circular dielectric substrate 4 is provided with the second output port 503, the inner wall of one side of the circular dielectric substrate 4 is provided with the third output port 504, and the inner wall of one side of the circular dielectric substrate 4 is provided with the fourth output port 505; the square dielectric substrate 2 and the first dielectric plate 507 are both made of FR4 plates with the thickness of 0.8mm and the dielectric constant of 4.5, so that signal transmission can be ensured; by exciting the loop antenna array by using the feed network 5, the vertically polarized antenna can carry out omnidirectional radiation on a horizontal plane and has the characteristic of like a monopole; due to the nesting between the antennas, the electromagnetic coupling between each other is strengthened.
The loop antenna unit 3 includes a first metal sheet 301, a second metal sheet 302, a third metal sheet 303, a first metal column 304, a second metal column 305, a third metal column 306 and a fourth metal column 307, the first metal column 304 is electrically installed on the outer wall of the top end of the circuit 509 corresponding to the first output port 502, the second metal column 305 is electrically installed on the outer wall of the top end of the circuit 509 corresponding to the second output port 503, the third metal column 306 is electrically installed on the outer wall of the top end of the circuit 509 corresponding to the third output port 504, the fourth metal column 307 is electrically installed on the outer wall of the top end of the circuit 509 corresponding to the fourth output port 505, the outer walls of the top ends of the first metal column 304, the second metal column 305, the third metal column 306 and the fourth metal column 307 are fixedly connected with the third metal sheet 303 respectively, the outer wall of the top end of the third metal sheet 303 is fixedly connected with the second metal sheet 302, and the outer wall of one side of the second metal sheet 302 is fixedly connected with the first metal sheet 301; the dipole antenna 1 comprises a fan-shaped radiation patch 101 and annular branches 102, the fan-shaped radiation patch 101 is distributed and mounted on the outer wall of the top end of the square dielectric substrate 2, and the annular branches 102 are symmetrically and fixedly mounted on the outer wall of one side of the fan-shaped radiation patch 101; the distance between the antenna arms of the dipole antenna 1 is 2.2mm; three polarizations, vertical and horizontal + -45 DEG polarizations, are achieved by using the loop antenna element 3 and the crossed dipole antenna 1; by nesting the dipole antenna 1 in the middle of the annular antenna unit 3 array, the caliber size of the antenna can be effectively reduced, and the miniaturization of the antenna is achieved.
The first zigzag balun 6 includes a second dielectric plate 601, a second metal floor 602, a sawtooth structure 603, a first open slot 604, a first microstrip line 605, a second microstrip line 606, and a first microstrip line
The working principle of the invention is as follows: simulation calculations were performed using the commercial simulation software ANSYS HFSS — 18.0 for the S11 and S22, S33 parameters (i.e., the self-reflection coefficients of the first wiring port 501, the second wiring port 609, and the third wiring port 6015) of the above example, and the results are shown in fig. 8; then, simulation calculation is carried out on S21, S31 and S23 of the above example by using commercial simulation software ANSYS HFSS _18.0, and the result is shown in FIG. 9; finally, simulation calculation is carried out on far-field radiation patterns of different main planes of the first wiring port 501, the second wiring port 609 and the third wiring port 6015 respectively by using commercial simulation software ANSYS HFSS _18.0, and the result is shown in FIGS. 1-21; since the ± 45 ° polarized antenna far-field patterns are similar, only the +45 ° polarized pattern is given for simplifying the description; when the first wiring port 501 feeds power, and the second wiring port 609 is matched with the third wiring port 6015, a far-field radiation pattern of the vertical polarization antenna can be obtained; 10, 12 and 14 are far field radiation patterns of the xoy plane at 3.5GHz, 4.5GHz and 5GHz frequency points for the antenna when the first patch port 501 feeds, and the second patch port 609 and the third patch port 6015 match, respectively;
FIGS. 11, 13 and 15 are far field radiation patterns of the yoz plane at 3.5GHz, 4.5GHz and 5GHz frequency points for the antenna when the first patch port 501 feeds, and the second patch port 609 and the third patch port 6015 match, respectively; figures 16, 18 and 20 are the far field radiation patterns of the xoz plane at the 3.5GHz, 4.5GHz and 5GHz frequency points of the antenna when the second patch port 609 feeds and the first patch port 501 and third patch port 6015 match, respectively; FIGS. 17, 19 and 21 are far field radiation patterns of the yoz plane at 3.5GHz, 4.5GHz and 5GHz frequency points for the antenna when the second patch port 609 feeds and the first patch port 501 and third patch port 6015 match, respectively;
with the return loss larger than 10dB as a standard, the common impedance bandwidth of the first wiring port 501, the second wiring port 609 and the third wiring port 6015 in the embodiment is 3.34 to 5.57GHz, and the relative bandwidth is 50%; referring to fig. 9 again, the isolation between the first wiring port 501, the second wiring port 609 and the third wiring port 6015 is greater than 28dB over the entire operating frequency band, and particularly, the isolation between the first wiring port 501 and the third wiring port 6015 reaches 40dB over the entire operating frequency band; then, referring to fig. 10 to fig. 15, it can be seen that the annular antenna element 3 exhibits monopole-like radiation characteristics, and exhibits omnidirectional radiation characteristics on a horizontal plane (xoy plane), and as frequency increases, the out-of-roundness of an omnidirectional radiation pattern gradually deteriorates, which is caused by an array factor of a circular array, but within the entire operating frequency band, the out-of-roundness of the pattern is still less than 5dB; finally, referring to fig. 16 to 21, it can be seen that the dipole antenna 1 exhibits directional radiation characteristics on the xoz plane and the yoz plane, the maximum radiation characteristic is always located on the + z axis in the whole working frequency band, no deviation or lobe is generated, the cross polarization is low, and the overall performance is good.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and equivalent alternatives or modifications according to the technical solution and the inventive concept of the present invention should be covered by the scope of the present invention.
Claims (8)
1. The high-isolation broadband tri-polarization MIMO antenna is characterized by comprising a dipole antenna (1), a square dielectric substrate (2), an annular antenna unit (3), a circular dielectric substrate (4), a feed network (5), a first zigzag balun (6) and a second zigzag balun (7), wherein the feed network (5) is fixed on the outer wall of the bottom end of the circular dielectric substrate (4), the annular antenna unit (3) is fixed on the outer wall of the top end of the circular dielectric substrate (4), the first zigzag balun (6) is fixed on the outer wall of the top end of the circular dielectric substrate (4), the second zigzag balun (7) is fixed on the outer wall of the circular dielectric substrate (4) on one side of the first zigzag balun (6), the square dielectric substrate (2) is installed on the outer wall of the top end of the first zigzag balun (6), and the dipole antenna (1) is fixed on the outer wall of the top end of the square dielectric substrate (2);
the feed network (5) comprises a first wiring port (501), a first output port (502), a second output port (503), a third output port (504), a fourth output port (505), a 100-ohm resistor (506), a first dielectric plate (507), a first metal floor (508) and a circuit (509), a first dielectric plate (507) is fixedly connected on the outer wall of the bottom end of the circular dielectric substrate (4), a first metal floor (508) is fixedly connected on the outer wall of the bottom end of the first medium plate (507), a circuit (509) is arranged on the inner wall of the bottom end of the first metal floor (508), a first wiring port (501) is arranged on the inner wall of one side of the first dielectric plate (507), and the electrical input terminal of the first wiring port (501) is electrically connected with the electrical output shaft of the circuit (509), the inner wall of the first metal floor (508) between the circuits (509) is provided with a 100 ohm resistor (506), a first output port (502) is arranged on the inner wall of one side of the circular dielectric substrate (4), a second output port (503) is arranged on the inner wall of one side of the circular dielectric substrate (4), a third output port (504) is arranged on the inner wall of one side of the circular dielectric substrate (4), and a fourth output port (505) is formed on the inner wall of one side of the circular dielectric substrate (4).
2. The high-isolation broadband triple-polarized MIMO antenna according to claim 1, wherein the loop antenna unit (3) comprises a first metal sheet (301), a second metal sheet (302), a third metal sheet (303), a first metal column (304), a second metal column (305), a third metal column (306) and a fourth metal column (307), the first metal column (304) is electrically mounted on the outer wall of the top end of the circuit (509) corresponding to the first output port (502), the second metal column (305) is electrically mounted on the outer wall of the top end of the circuit (509) corresponding to the second output port (503), the third metal column (306) is electrically mounted on the outer wall of the top end of the circuit (509) corresponding to the third output port (504), the fourth metal column (307) is electrically mounted on the outer wall of the top end of the circuit (509), the first metal column (304), the second metal column (305), the third metal column (306) and the outer wall of the top end of the fourth metal column (307) are respectively and fixedly connected with one side of the third metal sheet (301), and the outer wall of the third metal column (303) is fixedly connected with the outer wall of the third metal sheet (302).
3. The high-isolation broadband triple-polarized MIMO antenna according to claim 1, wherein the first zigzag balun (6) comprises a second dielectric plate (601), a second metal floor (602), a zigzag structure (603), a first open slot (604), a first microstrip line (605), a second microstrip line (606), a third microstrip line (607), a fourth microstrip line (608), a second connection port (609), a fifth microstrip line (6010), a sixth microstrip line (6011), a seventh microstrip line (6012), an eighth microstrip line (6013), a second open slot (6014) and a third connection port (6015), the second dielectric plate (601) is fixedly connected to the outer wall of the top end of the circular dielectric substrate (4), the second metal floor (602) is installed on the inner wall of one side of the second dielectric plate (601), the zigzag structure (603) is distributed on the inner wall of one side of the second metal floor (602), the first dielectric plate (601) is installed on the inner wall of the top end of the second dielectric plate (601), the inner wall of the bottom end of the second open slot (604) is installed on the second microstrip line (609), the inner wall of the fourth connection port (609) is connected to the third microstrip line (609), the microstrip line connector is characterized in that a second microstrip line (606) is electrically connected to the outer wall of one side of the third microstrip line (607), a first microstrip line (605) is electrically connected to the outer wall of the bottom end of the second microstrip line (606), a second open slot (6014) is formed in the inner wall of the bottom end of the second sawtooth-shaped balun (7), a third wiring port (6015) is installed on the inner wall of the bottom end of the second sawtooth-shaped balun (7), an eighth microstrip line (6013) is installed on the inner wall of one side, located on the third wiring port (6015), of the second sawtooth-shaped balun (7), a seventh microstrip line 6012 is electrically connected to the outer wall of the top end of the eighth microstrip line (6013), a sixth microstrip line (6011) is electrically connected to the inner wall of one side of the seventh microstrip line (6012), and a fifth microstrip line (6010) is electrically connected to the outer wall of the bottom end of the sixth microstrip line (6011).
4. The high-isolation broadband triple-polarized MIMO antenna according to claim 1, wherein the dipole antenna (1) comprises a sector radiation patch (101) and annular branches (102), the sector radiation patch (101) is distributed and mounted on the outer wall of the top end of the square dielectric substrate (2), and the annular branches (102) are symmetrically and fixedly mounted on the outer wall of one side of the sector radiation patch (101).
5. The high-isolation wideband triple-polarized MIMO antenna according to claim 1, wherein the loop antenna elements (3) generate vertically polarized electromagnetic waves, and the dipole antenna at the center of the loop antenna array generates horizontally ± 45 ° polarized electromagnetic waves, thereby realizing triple-polarized far-field radiation characteristics.
6. A high isolation wideband tri-polarized MIMO antenna according to claim 1, characterized in that the distance between the antenna arms of the dipole antenna (1) is 2.2mm.
7. The high-isolation broadband triple-polarization MIMO antenna according to claim 1, wherein the FR4 board material with the thickness of 0.8mm and the dielectric constant of 4.5 is adopted as the square dielectric substrate (2) and the first dielectric board (507).
8. The high-isolation broadband tri-polarization MIMO antenna according to claim 1, wherein the circular dielectric substrate (4) is a Rogers5880 plate with a thickness of 0.762mm and a dielectric constant of 2.2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210734079.5A CN115241659A (en) | 2022-06-27 | 2022-06-27 | High-isolation broadband tri-polarization MIMO antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210734079.5A CN115241659A (en) | 2022-06-27 | 2022-06-27 | High-isolation broadband tri-polarization MIMO antenna |
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