CN112701473B - End-fire filtering MIMO antenna - Google Patents
End-fire filtering MIMO antenna Download PDFInfo
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- CN112701473B CN112701473B CN202011541048.5A CN202011541048A CN112701473B CN 112701473 B CN112701473 B CN 112701473B CN 202011541048 A CN202011541048 A CN 202011541048A CN 112701473 B CN112701473 B CN 112701473B
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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
- H01Q1/002—Protection against seismic waves, thermal radiation or other disturbances, e.g. nuclear explosion; Arrangements for improving the power handling capability of an antenna
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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
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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
- 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
- H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
- H01Q9/04—Resonant antennas
- H01Q9/06—Details
- H01Q9/065—Microstrip dipole antennas
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The invention discloses an end-fire filtering MIMO antenna. The antenna comprises four end-fire filter antenna units, wherein each end-fire filter antenna unit comprises a first dielectric substrate and a second dielectric substrate; the first dielectric substrate is positioned above the second dielectric substrate; the upper surface of the first dielectric substrate is provided with a director, a driving dipole and a reflector, the driving dipole is positioned between the director and the reflector, and the end-fire filter antenna unit can generate radiation in an end-fire direction through the radiation action of the director and the reflector; the upper surface of the second dielectric substrate is provided with a resonator, and the lower surface of the second dielectric substrate is provided with a metal floor; a coaxial probe connected with the upper surface and the lower surface is arranged in the middle of the second dielectric substrate; the resonator is fed by a coaxial probe and the director, driven dipole and reflector on the first dielectric substrate are excited by resonator coupling. The invention has the advantages of simple structure, low section, small area, high and stable in-band gain and capability of meeting the application of frequency bands such as sub-6GHz in the existing 5G communication.
Description
Technical Field
The invention relates to the technical field of filter antennas and MIMO antennas, in particular to an end-fire filter MIMO antenna.
Background
With the development of 5G communication technology, the performance requirement on the antenna is higher and higher. The end-fire antenna has the characteristics of high gain, anti-interference capability and directional radiation; the filter and the antenna are integrated into a whole, so that the filter antenna is widely applied; MIMO antennas have been an important component in modern wireless communications, which can multiply the communication capacity, thereby meeting the now increasing communication service demands.
The prior art is investigated and known, and the specific steps are as follows:
in 2016, hao-Tao Hu et al proposed a slot directional antenna, and used the directional slot antenna element to construct a four-element MIMO antenna array, in which the directional patterns of the four antenna elements are orthogonal, so that the correlation between the elements is greatly reduced, and the isolation is very high, but the antenna does not have a filtering effect. (H.Hu, F.Chen and Q.Chu, "A Compact Directional Slot Antenna and Its Application in MIMO Array," in IEEE Transactions on Antennas and Propagation, vol.64, no.12, pp.5513-5517, dec.2016.)
In 2018, jian-Feng Qian et al proposed a novel electromagnetic gap-coupling wideband patch antenna, which was designed as a MIMO antenna array, and four antenna units were placed in rotation, with each two units being orthogonal to each other. The MIMO antenna has not only high isolation but also good filtering performance, but is an side-firing antenna rather than an end-firing antenna. (J.Qian, F.Chen, Q.Chu, Q.Xue and M.J.Lancaster, "A Novel Electric and Magnetic Gap-Coupled Broadband Patch Antenna With Improved Selectivity and Its Application in MIMO System," in IEEE Transactions on Antennas and Propagation, vol.66, no.10, pp.5625-5629, oct.2018.)
In general, there are many MIMO antennas related to filtering or end-fire, but there are few MIMO antennas with both end-fire and filtering characteristics.
Disclosure of Invention
The invention aims to overcome the defects and shortcomings of the prior art and provides an end-fire filtering MIMO antenna. The end-fire filter antenna unit mainly generates left and right edge radiation zero points outside the band through a branch loading resonator with a short-circuit post and a driving dipole, so that the antenna has better filter characteristics; the directors and the reflectors are introduced, so that the antenna forms radiation in the end-fire direction, and the antenna has higher and flat gain in the band; the antenna unit is designed into an end-fire filtering MIMO antenna formed by four antenna units, so that the communication capacity is increased, an additional decoupling structure is not needed, and the ports are also high in isolation. The antenna has the advantages of simple structure, low profile, small area and the like.
The object of the invention is achieved by at least one of the following technical solutions.
The end-fire filtering MIMO antenna comprises four end-fire filtering antenna units, wherein each end-fire filtering antenna unit comprises a first dielectric substrate and a second dielectric substrate;
the first dielectric substrate is positioned above the second dielectric substrate; the upper surface of the first dielectric substrate is provided with a director, a driving dipole and a reflector, the driving dipole is positioned between the director and the reflector, and the end-fire filter antenna unit can generate radiation in an end-fire direction through the radiation action of the director and the reflector;
the upper surface of the second dielectric substrate is provided with a resonator, and the lower surface of the second dielectric substrate is provided with a metal floor; a coaxial probe connected with the upper surface and the lower surface is arranged in the middle of the second dielectric substrate;
the resonator is fed by a coaxial probe and the director, driven dipole and reflector on the first dielectric substrate are excited by resonator coupling.
Further, there is no air layer between the first dielectric substrate and the second dielectric substrate.
Further, the material of the first dielectric substrate is RT5880.
Further, the material of the second dielectric substrate is RO4003C.
Further, the resonator is a stub loading resonator with a shorting post located in the second dielectric substrate that connects the center stub of the resonator with the metal floor.
Further, the four end-fire filter antenna units are arranged in a quadrature rotation mode.
Further, the left edge radiation zero point is generated by loading the resonator through the branches with the short-circuit posts, and the dipole is driven to generate the right edge radiation zero point, so that the end-fire filter antenna unit has filter characteristics.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. compared with the existing end-fire filter antenna, the antenna unit of the invention has the advantages that the traditional balun structure is not needed to play a role in balance-unbalance conversion by coupling the excitation radiation unit, and the end-fire filter antenna without balun is realized.
2. Compared with the existing end-fire filter antenna, the branch loading resonator with the short-circuit post of the antenna unit not only serves as a resonator to generate a left edge radiation zero point, but also serves as a radiation element to radiate energy to the driving dipole to generate a right edge radiation zero point, so that the antenna unit realizes the filter function.
3. Compared with the existing end-fire filter antenna, the antenna unit has the advantages of simple design structure and small volume. According to electromagnetic simulation results, the gain in the band is higher and flat, about 7dBi, and the out-of-band rejection level is better, about 20dB.
4. Compared with the existing MIMO antenna, the MIMO antenna has the advantages that the MIMO antenna has the end-fire and filtering characteristics, an additional decoupling structure is not needed, isolation of more than 18dB is also provided between ports, and the MIMO antenna can be applied to frequency bands such as sub-6GHz (4.8-4.9 GHz) in 5G communication.
Drawings
Fig. 1 is a side view of an end-fire filter antenna unit according to an embodiment of the invention.
Fig. 2 is a top view of a first dielectric substrate of an end-fire filter antenna unit according to an embodiment of the present invention.
Fig. 3 is a top view of a second dielectric substrate of an end-fire filter antenna unit according to an embodiment of the present invention.
Fig. 4 is a bottom view of a second dielectric substrate of an end-fire filter antenna unit according to an embodiment of the present invention.
Fig. 5 is a top view of an end-fire filtered MIMO antenna according to an embodiment of the present invention.
Fig. 6 is a schematic diagram of S11 and end-fire direction gain simulation results of an end-fire filter antenna unit according to an embodiment of the present invention.
Fig. 7 is a schematic diagram of a radiation pattern (XOZ) simulation result of an end-fire filtering antenna unit at 5GHz according to an embodiment of the present invention.
Fig. 8 is a schematic diagram of S11 and end-fire direction gain simulation results of an end-fire filtering MIMO antenna according to an embodiment of the present invention.
Fig. 9 is a diagram of simulation results of S21 and S31 of an end-fire filtering MIMO antenna according to an embodiment of the present invention.
Fig. 10 is a schematic diagram of a radiation pattern (XOZ) simulation result of an end-fire filtering MIMO antenna at 5GHz according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to examples and drawings, but embodiments of the present invention are not limited thereto.
Examples:
an end-fire filtering MIMO antenna comprises four end-fire filtering antenna units, as shown in figure 1, wherein each end-fire filtering antenna unit comprises a first dielectric substrate a and a second dielectric substrate b;
as shown in fig. 2, the first dielectric substrate a is located above the second dielectric substrate b; the upper surface of the first dielectric substrate is provided with a director 1, a driving dipole 2 and a reflector 3, wherein the driving dipole 2 is positioned between the director 1 and the reflector 3, and the end-emission filter antenna unit can generate radiation in an end-emission direction through the radiation action of the director 1 and the reflector 3;
the upper surface of the second dielectric substrate b is provided with a resonator 4, and the lower surface is provided with a metal floor 7; as shown in fig. 3 and 4, a coaxial probe 6 is provided in the middle of the second dielectric substrate b to connect the upper and lower surfaces;
the resonator 4 is fed by a coaxial probe 6 and the director 1, the driven dipole 2 and the reflector 3 on the first dielectric substrate a are excited by the coupling of the resonator 4.
The resonator 4 is a stub loaded resonator with a shorting post 5, as shown in fig. 3 and 4, the shorting post 5 is located in the second dielectric substrate b, which connects the center stub of the resonator 4 with the metal floor 7.
As shown in fig. 5, the four endfire filter antenna elements are arranged in a quadrature rotation.
In this embodiment, the material of the first dielectric substrate a is RT5880, the relative dielectric constant is 2.2, and the loss tangent is 0.0009; the material of the second dielectric substrate b was RO4003C, the relative dielectric constant thereof was 3.38, and the loss tangent thereof was 0.0027.
The resonator 4 is loaded through the branch with the short circuit 5 to generate a left edge radiation zero point, and the dipole 2 is driven to generate a right edge radiation zero point, so that the end-fire filter antenna unit has a filter characteristic.
In this embodiment, the size of the end-fire filter antenna unit is 25×22×3.099mm3, and the size of the mimo end-fire filter antenna is 56×56×3.099mm3. The end-fire filter antenna unit and the MIMO end-fire filter antenna of this embodiment were subjected to verification simulation by HFSS software. As shown in fig. 6, curves of S11 parameter (input port return loss) and end-fire direction gain simulation results of the end-fire filter antenna unit in the frequency range of 3-6.7GHz are given; the frequency band with S11 less than or equal to-10 dB is 4.5-5.18 GHz, the relative bandwidth is 14.05%, the in-band gain is about 7dBi, and the out-of-band rejection level can reach 20dB. As shown in fig. 7, which shows the main plane radiation pattern of the end-fire filter antenna unit at 5GHz, it is clear from fig. 7 that the end-fire filter antenna unit has end-fire performance and the cross polarization level is less than 27dB. As shown in fig. 8, curves of S11 parameters and end-fire direction gain simulation results of the MIMO end-fire filter antenna formed by the end-fire filter antenna units in the frequency range of 3-6.7GHz are given; it can be seen that the MIMO end-fire filter antenna also has a filtering function due to the presence of the out-of-band radiation nulls of the end-fire filter antenna elements used. As shown in fig. 9, simulation results of S21 and S31 of the MIMO end-fire filter antenna are given, and it can be seen that no additional decoupling structure is required, and both S21 and S31 are greater than 18dB. As shown in fig. 10, the main plane radiation pattern of the MIMO end-fire filter antenna at 5GHz is shown, and compared with the existing MIMO antenna, the pattern tilt phenomenon generally occurs, but the end-fire filter antenna still has stable end-fire radiation performance. Therefore, the simulation result shows that the end-fire filtering MIMO antenna has stable end-fire characteristics and good filtering function, stable in-band gain, high out-of-band inhibition level, simple structure and small volume, can meet the requirements of sub-6GHz (4.8-4.9 GHz) and other frequency bands applied to the existing 5G communication, and is worthy of popularization.
The above embodiments are only preferred embodiments of the present invention, and are not intended to limit the scope of the present invention, so variations in shape and principles of the present invention should be covered.
Claims (3)
1. The end-fire filtering MIMO antenna comprises four end-fire filtering antenna units and is characterized in that the end-fire filtering antenna units comprise a first dielectric substrate (a) and a second dielectric substrate (b);
wherein the first dielectric substrate (a) is positioned above the second dielectric substrate (b); the upper surface of the first dielectric substrate is provided with a director (1), a driving dipole (2) and a reflector (3), wherein the driving dipole (2) is positioned between the director (1) and the reflector (3), and the end-fire filter antenna unit can generate radiation in an end-fire direction through the radiation action of the director (1) and the reflector (3);
the upper surface of the second dielectric substrate (b) is provided with a resonator (4), and the lower surface is provided with a metal floor (7); a coaxial probe (6) connected with the upper surface and the lower surface is arranged in the middle of the second dielectric substrate (b);
the resonator (4) is fed by a coaxial probe (6), and the director (1), the driving dipole (2) and the reflector (3) on the first dielectric substrate (a) are excited by the coupling of the resonator (4);
the resonator (4) is a branch loading resonator with a short-circuit column (5); the short-circuit column (5) is positioned in the second dielectric substrate (b) and connects the central branch of the resonator (4) with the metal floor (7);
the low-frequency radiation zero point is generated by loading the resonator (4) through the branches with the short-circuit posts (5), and the dipole (2) is driven to generate the high-frequency radiation zero point, so that the end-fire filter antenna unit has a filter characteristic;
an air layer is not arranged between the first dielectric substrate (a) and the second dielectric substrate (b);
the four end-fire filter antenna units are arranged in an orthogonal rotation mode.
2. An end-fire filtered MIMO antenna as claimed in claim 1, wherein: the material of the first dielectric substrate (a) is RT5880.
3. An end-fire filtered MIMO antenna as claimed in claim 1, wherein: the material of the second dielectric substrate (b) is RO4003C.
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| CN202011541048.5A CN112701473B (en) | 2020-12-23 | 2020-12-23 | End-fire filtering MIMO antenna |
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| CN112701473B true CN112701473B (en) | 2023-07-28 |
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| CN113328256B (en) * | 2021-05-24 | 2022-10-14 | 电子科技大学 | End-fire dielectric resonator antenna |
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