CN116706515A - Broadband dual-polarized magneto-electric dipole filter antenna - Google Patents
Broadband dual-polarized magneto-electric dipole filter antenna Download PDFInfo
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- 230000010287 polarization Effects 0.000 claims description 10
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- 238000005388 cross polarization Methods 0.000 claims description 5
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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
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
- H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
- H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
- H01Q1/241—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
- H01Q1/246—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for base stations
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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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- 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
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- 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
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Abstract
A broadband dual-polarized magneto-electric dipole filter antenna comprises a magnetic dipole patch and a dielectric plate group thereof, an electric dipole patch and a dielectric plate thereof, a bottom dielectric plate, a pair of coaxial lines, a pair of feed microstrip lines and a dielectric plate thereof; the electric dipole dielectric plate is provided with 8 slots for connecting the magnetic dipole dielectric plate groups, and 4 slots for connecting the feed microstrip line dielectric plate groups; the magnetic dipole dielectric plate group is printed with a magnetic dipole patch, the upper part of the magnetic dipole dielectric plate group is connected with the electric dipole patch, and the lower part of the magnetic dipole dielectric plate group is connected with the metal ground. The feed microstrip line is printed on the lower surfaces of the feed dielectric plate and the electric dipole dielectric plate and is fixedly connected with the bottom dielectric plate. The upper surface of the bottom dielectric plate is printed with a metal ground, and 8 slots are arranged for connecting and fixing the magnetic dipole dielectric plate group; a metallized circular through hole is arranged for the coaxial line inner core to pass through and connect with the feed microstrip line and the outer layer is connected with the metal ground. No additional filter circuit is introduced, so that the dual-polarization function and the band-pass filter characteristic are realized, and the frequency band requirement of LTE base station communication is met.
Description
Technical Field
The invention relates to the technical field of antennas, in particular to a broadband dual-polarized magnetic dipole filter antenna which can be applied to an LTE wireless communication system.
Background
With the rapid development of wireless communication systems and the demand for large-capacity data transmission, more and more frequency bands are being applied to new fields. In recent years, 5G large-scale commercial service in China is formally started, 2G/3G networks are phased out, and the base station realizes coexistence of LTE and 5G networks and is a necessary trend of development in the next years.
In order to reduce the overall volume of the antenna, the different antenna units need to be closely placed, which results in stronger port coupling between the different units, and finally, poor isolation effect between the ports of the different antenna units. One potential solution is to use a filtering antenna, integrate filtering and radiating functions, eliminate interconnections and matching networks between circuits, reduce losses, achieve miniaturization, and reduce inter-frequency coupling between antenna elements of different frequency bands that are closer together. The filter antenna is generally realized by modifying a feed structure, integrating the antenna and the filter by using a coupling matrix theory, introducing parasitic elements, and the like.
On the basis of the filter antenna, in order to cater for the coexistence trend of LTE and 5G networks, it is desirable to widen the bandwidth of the filter antenna as much as possible. In a broadband system, the antenna radiates effectively in a plurality of frequency bands simultaneously, and the whole system is small in size because the antenna can be realized by only one element. The method for realizing the broadband antenna generally comprises the steps of introducing slot lines and the like into an antenna radiator to adjust a higher order mode, properly increasing the height of the antenna, introducing a differential feed structure and the like.
The magneto-electric dipole antenna is proposed by Liu Gui teaching (K.M. Luk and H.Wong, "A new wideband unidirectional antenna element", int.J. Microw.Opt.technology., vol.1, no.1, pp.35-44, jun.2006.) in 2006, and has the characteristics of wide bandwidth, stable directivity pattern, large front-rear ratio and the like, is easy to expand into a dual-polarized antenna, is easy to introduce a filtering unit, and is suitable for becoming a base station alternative antenna.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a broadband dual-polarized magneto-electric dipole filter antenna, which utilizes the principle of a transmission line step impedance filter (SIR filter) to integrally design dual-polarized functions and filtering characteristics on the magneto-electric dipole antenna, does not introduce extra insertion loss, can maintain the simple structure of the antenna and meets the communication band requirement of a base station antenna LTE network.
The invention comprises a magnetic dipole, an electric dipole, a bottom dielectric plate and a feed structure;
the magnetic dipoles comprise magnetic dipole medium plate groups and magnetic dipole patches, the magnetic dipole medium plate groups comprise 8 identical medium plates, every 2 medium plates which are oppositely arranged are in a group, four medium plates are symmetrically and vertically arranged along the rotation of a vertical central axis, and the magnetic dipole patches are printed on the surfaces of the magnetic dipole medium plate groups; the magnetic dipole dielectric plate is provided with a dielectric plate part with a narrower width at the top so as to lead the equivalent transmission line to generate step impedance; the top of the magnetic dipole medium plate group is provided with a medium plate part with a narrower width, the magnetic dipole patches comprise 8 metal patches, the 8 metal patches are respectively arranged on one surface of 1 magnetic dipole medium plate, every two parallel metal patches are in a group, and the two parallel metal patches are respectively vertically arranged right above, right below, right left and right at the central position of the bottom medium plate;
the electric dipole comprises an electric dipole dielectric plate and an electric dipole patch, and the electric dipole patch is printed on the upper surface of the electric dipole dielectric plate to serve as a radiator structure; the electric dipole patches are four metal patches; a horizontal metal strip is printed on the lower surface of the electric dipole dielectric plate; the electric dipole dielectric plates are provided with 8 slots for connecting the magnetic dipole dielectric plate groups and 4 slots for connecting the feed dielectric plates;
the upper surface of the bottom dielectric plate is printed with a metal ground, a plurality of slots are arranged on the bottom dielectric plate, and the magnetic dipole dielectric plate group and the feed dielectric plate group are fixed on the bottom dielectric plate through the slots; the magnetic dipole patch is contacted with the metal ground through the slot; a metallized round via hole is also arranged on the bottom dielectric plate;
the feeding structure comprises a pair of coaxial lines and 5 feeding dielectric plates, wherein the inner surface of each feeding dielectric plate is provided with vertical metal strips, 2 feeding dielectric plates are vertically arranged, the top of each feeding dielectric plate is connected with the electric dipole dielectric plate, and the vertical metal strips are connected with the horizontal metal strips on the lower surface of each electric dipole dielectric plate to form a feeding unit in a polarization direction; the rest feeding medium plates are arranged in the orthogonal direction of the feeding unit, 1 feeding medium plate is horizontally arranged, 2 feeding medium plates are vertically arranged and connected with the horizontal feeding medium plates, and metal strips on the inner surfaces of the medium plates are connected to form the feeding unit in the other polarization direction; the bottoms of all the vertical feed dielectric plates are connected with the bottom dielectric plate; the two feed units are feed microstrip lines with different horizontal heights in two polarization directions and mutually orthogonal, the feed microstrip lines adopt step impedance type eta feed lines, the eta feed lines comprise three sections of step impedance microstrip line patches with different widths, and the eta feed lines are printed on the surfaces of the feed dielectric plates and the lower surfaces of the electric dipole dielectric plates; the outer metal of the pair of coaxial lines is grounded through the edge of the metallized via hole on the bottom dielectric plate, and the inner core of the coaxial lines passes through the bottom dielectric plate and is connected with the metal surface of the microstrip line of the feed structure.
The low-frequency radiation zero point I is generated by an antenna structure, the high-frequency sideband radiation zero point II is generated by impedance step of an equivalent transmission line by a connecting structure of a magnetic dipole patch and an electric dipole patch, the high-frequency radiation zero point III is generated by an eta type feeder line of which the feed structure is changed from a traditional gamma type to step impedance type, no filter unit is introduced, and the integration of a filter function and an antenna radiation effect is easy to realize.
The low-frequency radiation zero point I is controlled by the length of the electric dipole patch and the height of the magnetic dipole patch;
the high-frequency sideband radiation zero II is generated by equivalent transmission line step impedance, and is specifically controlled by an SIR structure on the magnetic dipole patch; the principle is that the magnetic dipole antenna can be equivalently used as an SIR filter, the transmission zero point of a higher order mode of the SIR filter can be controlled by the impedance difference, and the SIR structure of the magnetic dipole patch determines the impedance difference of an equivalent transmission line, so that the position of a radiation zero point II of a high-frequency sideband can be determined;
the high-frequency radiation zero point III is controlled by the length and the width of each part of the eta-type feeder line; the principle is that the feeder lines are provided with a coupling path respectively at two opposite parts of the magneto-electric dipole antenna, 180-degree phase difference is generated between different paths, and the lengths and the widths of different parts of the feeder lines can influence the coupling paths so as to control the frequency positions corresponding to the radiation zero points.
The upper part of the magnetic dipole dielectric plate group is connected with the electric dipole patch through the slot of the electric dipole dielectric plate to form a magnetic electric dipole antenna.
The bottom layer dielectric plate is provided with 8 slots, and is used for connecting the magnetic dipole dielectric plate group with the bottom layer dielectric plate, and the metal ground is connected with the magnetic dipole patch through the slots.
The bottom dielectric plate and the electric dipole dielectric plate are provided with slots for connecting and fixing the feed dielectric plate, the feed dielectric plate is printed with feed microstrip lines, and a part of feed microstrip lines are printed on the lower surface of the electric dipole dielectric plate.
The bottom dielectric plate is provided with a metallized circular through hole for the coaxial line to pass through and be fixedly connected, the outer metal of the coaxial line is connected with the metal ground, and the inner core of the coaxial line passes through the bottom dielectric plate and is connected with the feed microstrip line.
The broadband dual-polarized magneto-electric dipole filter antenna provided by the invention covers the LTE network communication frequency band, has the bandwidth reaching 47.6%, and can become an alternative antenna for base station application.
The broadband dual-polarization magneto-electric dipole filter antenna has the advantages that the back lobe of the directional diagram is low, the front-back ratio is higher than 20dB, the cross polarization level is below-18 dB, and the stable radiation mode is realized.
The invention has the beneficial effects that:
(1) The broadband dual-polarized magnetic dipole filter antenna has a simple structure, and does not increase the size compared with the traditional magnetic dipole antenna. Meanwhile, a SIR filter of the equivalent circuit of the magnetic dipole antenna is combined with a circuit at the tail end of an eta type feeder line with step impedance to generate a band-pass filtering radiation effect without any filter network and additional other parasitic structures, and the out-of-band suppression level of more than 17dB is realized.
(2) The radiation zero point of the broadband dual-polarized magneto-electric dipole filter antenna can be independently controlled: the low-frequency radiation zero point I can be independently controlled by controlling the length of the electric dipole and the height of the magnetic dipole; the SIR structure of the magnetic dipole patch is controlled to independently control the high-frequency sideband radiation zero II; the high frequency radiation zero point III can be independently controlled by controlling the length and width of each part of the feeder.
(3) The broadband dual-polarization magneto-electric dipole filter antenna provided by the invention has the advantages that the impedance bandwidth covered by the antenna is 47.6% (1.59-2.6 GHz), and the LTE communication frequency band is covered, so that the antenna can be applied to a base station antenna for mobile communication.
(4) The broadband dual-polarization magneto-electric dipole filter antenna has stable directional diagram, realizes cross polarization level below-18 dB, and has main polarization in a directional radiation mode, and the front-back ratio is higher than 20dB.
Drawings
FIG. 1 is a schematic diagram of an embodiment of the present invention;
FIG. 2 is an exploded view of an embodiment of the present invention;
FIG. 3 is a top view of an underlying dielectric plate;
FIG. 4 is a schematic structural view of a feed structure;
FIG. 5 is a side view of a magnetic dipole dielectric sheet set;
FIG. 6 is a top view of an electric dipole dielectric plate;
FIG. 7 is a graph of simulation and test results of the variation of S-parameters with frequency for an antenna according to the present invention;
FIG. 8 is a graph of simulation and test results of the variation of antenna gain with frequency according to the present invention;
FIG. 9 is a graph of simulation and test results of a planar antenna pattern of the present invention at a frequency XOZ of 1.7 GHz;
FIG. 10 is a graph of simulation and test results of a planar pattern of the antenna of the present invention at a frequency YOZ of 1.7 GHz;
FIG. 11 is a graph of simulation and test results of a planar pattern of an antenna of the present invention at a frequency XOZ of 2.5 GHz;
fig. 12 is a graph of simulation and test results of the antenna of the present invention at a frequency YOZ of 2.5 GHz.
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.
As shown in fig. 1 to 6, the wideband dual-polarized magnetic dipole filter antenna of the embodiment of the invention comprises a bottom dielectric plate 1, a feed structure 2, a magnetic dipole dielectric plate group 3, an electric dipole dielectric plate 4 and a pair of coaxial lines 5.
The upper surface of the bottom layer dielectric plate is provided with a metal surface 6 serving as a metal ground, the bottom layer dielectric plate is provided with a group of magnetic dipole dielectric plate slots 10 and a group of feed structure slots 11, the magnetic dipole dielectric plate slots 10 are used for connecting and fixing the magnetic dipole dielectric plate groups, and dielectric plate parts with narrower top widths of the magnetic dipole dielectric plates are contacted with the electric dipole patches through the slots; the feeding structure slot 11 is used for fixing the magnetic dipole dielectric plate group 3 and the feeding structure 2, a pair of circular metallized through holes 16 are formed in the feeding structure slot 11 and used for grounding and connecting and fixing the coaxial lines, and the magnetic dipole patch 9 of the magnetic dipole dielectric plate group 3 is in contact with the metal ground through the feeding structure slot 11;
the power feeding structure 2 comprises a pair of coaxial lines 5, a first power feeding unit and a second power feeding unit, wherein the first power feeding unit and the second power feeding unit are two eta-type power feeding lines with different levels of polarization directions and mutually orthogonal step impedance, the eta-type power feeding lines comprise three sections of step impedance microstrip line patches with different widths, and the eta-type power feeding lines are printed on the surfaces of a power feeding dielectric plate and the lower surfaces of electric dipole dielectric plates;
the first feeding unit is an eta type feeder with a step impedance type and comprises two vertical metal strips 12 which are respectively printed on the inner surfaces of two first feeding vertical dielectric plates 17 and a first horizontal metal strip 13 which is printed on the lower surface of the electric dipole dielectric plate 4, wherein the lengths and the widths of the two metal strips contained in the vertical metal strips 12 are different, the lengths and the widths of the two metal strips are also different from those of the metal strips 13, the metal strips are in contact arrangement, and the vertical dielectric plates 17 are connected with the bottom dielectric plates and the electric dipole dielectric plates through slots;
the second feeding unit is an eta type feeder with another step impedance type and comprises two vertical metal strips 14 respectively printed on the inner surfaces of two second vertical feeding dielectric plates 16 and a second horizontal metal strip 15 printed on the lower surface of a horizontal feeding dielectric plate 19, the height of the second horizontal metal strip 15 is lower than that of the first horizontal metal strip 13, the lengths and the widths of the metal strips 14 and 17 are different, the lengths and the widths of the metal strips 15 are also different, the metal strips are in contact with each other, and the second vertical feeding dielectric plate 16 is fixedly connected with the bottom dielectric plate and the horizontal feeding dielectric plate 19 through slots.
The magnetic dipole dielectric plate group 3 comprises 8 identical dielectric plates, two dielectric plates are arranged in a group, four dielectric plates are arranged vertically in a rotationally symmetrical manner along a vertical central axis, dielectric plates 20 with narrower widths are arranged at the bottoms of the dielectric plates and are used for being inserted into square slots 10 of the bottom dielectric plates 1 and fixed with the bottom dielectric plates 1, and the widths of the bottom dielectric plates are matched with the lengths of the square slots 10; a dielectric plate with a narrower width is arranged at the top part of the dielectric plate and is fixedly connected with the electric dipole dielectric plate; the inner surface of the magnetic dipole medium plate group is provided with a metal surface as a magnetic dipole patch 9, and the bottom of the magnetic dipole patch is connected with a metal ground; the top of the magnetic dipole patch is provided with a patch part 8 with a narrower width, and the patch part and the lower part of the magnetic dipole patch form an SIR structure, so that the equivalent transmission line generates step impedance, and the SIR structure can control the high-frequency sideband high-roll-off radiation zero point II.
The electric dipole dielectric plate 4 is provided with a slot 21 which is connected with the magnetic dipole dielectric plate group, the upper surface of the electric dipole dielectric plate 4 is provided with an electric dipole patch 7, and the electric dipole patch comprises four rectangular patches which are rotationally symmetrical along a vertical central axis and is connected with the tail end of the magnetic dipole patch 9 through the slot.
As shown in FIG. 7, the simulation and test result diagram of the S parameter-frequency of the antenna provided by the invention shows that the impedance matching in the passband is good, the working frequency band is 1.59-2.60GHz, the impedance bandwidth reaches 47.6%, the return loss is below-13 dB, the isolation in the working frequency band is below-23 dB, the out-of-band return loss of the low frequency and the high frequency is close to 0dB, and the antenna does not radiate energy at the moment, so that the band-pass filtering effect is realized.
As shown in FIG. 8, the simulation and test result diagram of the actual gain-frequency of the antenna of the invention realizes three controllable radiation zeros, realizes in-band gain of more than 8.5dBi, has out-of-band gain of less than-10 dB, and realizes out-of-band rejection level of more than 17 dB.
As shown in fig. 9 and 10, the simulation and test normalization patterns of the XOZ plane and YOZ plane of the antenna of the present invention are shown when the antenna is excited by a 1.7GHz single port; as shown in fig. 11 and 12, the simulation and test normalization patterns of the XOZ plane and YOZ plane of the antenna of the present invention are shown when the antenna is excited by a 2.5GHz single port; because of the port symmetry, the direction diagram of the other polarized port is basically consistent, the cross polarization level is finally lower than-18 dB, the main polarization is in a directional radiation mode, and the front-back ratio is higher than 20dB.
The invention introduces the characteristic of a transmission line step impedance resonator type filter (SIR filter) into a magnetic dipole antenna structure, and on the basis of bringing low-frequency radiation zero I by the inherent structure of the magnetic dipole antenna, a part with narrower width is arranged at the upper part of the magnetic dipole, which not only can provide a connection function, but also can be multiplexed as the part of the magnetic dipole equivalent transmission line step impedance, thus obtaining a high-roll-off radiation zero II of a high-frequency sideband; the traditional gamma-shaped feeder is changed into an eta-shaped feeder with a step impedance type, and the other radiation zero point III with high frequency is obtained.
The embodiment of the invention has the following advantages:
(1) The antenna has a simple structure, the inherent structure of the magnetic dipole antenna generates a low-frequency radiation zero point I, the connecting structure of the magnetic dipole and the electric dipole is multiplexed to be used as the part of the magnetic dipole equivalent transmission line step impedance, the high-frequency sideband radiation zero point II is obtained, the multi-path coupling of the eta type feeder line with the step impedance obtains a high-frequency radiation zero point III, the size of the antenna is not further increased, a band-pass filtering radiation effect is not required to be generated by any filter network and additional parasitic structures, and the out-of-band suppression level of more than 17dB is realized.
(2) The radiation zero point of the antenna can be independently controlled: the low-frequency radiation zero point I can be independently controlled by controlling the length of the electric dipole and the height of the magnetic dipole; the high-frequency sideband radiation zero II can be independently controlled by controlling the SIR structure at the top of the magnetic dipole; the high frequency radiation zero point III can be independently controlled by controlling the length and width of each section of the feeder.
(3) The directional pattern of the antenna is stable, the cross polarization level is lower than-18 dB, the main polarization is in a directional radiation mode, and the front-to-back ratio is higher than 20dB.
(4) The antenna of the invention realizes that the covered impedance bandwidth reaches 47.6% (1.59-2.60 GHz), and covers the LTE communication frequency band of the base station, thereby being capable of becoming an alternative antenna for the application of a communication system.
In the receiving and transmitting equipment of the wireless communication system which can adjust the size of the related structure according to the requirement and adapt to different frequency bands, the structure of the invention utilizes the isolation bandpass characteristic between two different ports of the orthogonally placed feed structure, and the connection structure and the feed structure using the magnetic dipole to obtain good bandpass filter characteristic, so that the size of the antenna is not increased, no other filter circuit is added, the working bandwidth covers the frequency band of the base station, and the invention is suitable for the multi-antenna wireless communication scene with low loss, multiple frequency bands and multiple systems. The antenna disclosed by the invention has a simpler structure, does not introduce an additional filter circuit, successfully realizes the dual-polarization function and the band-pass filter characteristic, reduces the structural complexity, and meets the frequency band requirement of LTE base station communication.
The foregoing examples are illustrative of the present invention and are not intended to be limiting, and any other modifications, combinations and simplifications, which do not depart from the spirit and principles of the invention, are intended to be included within the scope of the invention.
Claims (9)
1. A broadband dual-polarized magneto-electric dipole filter antenna is characterized by comprising a magnetic dipole, an electric dipole, a bottom dielectric plate and a feed structure;
the magnetic dipoles comprise magnetic dipole medium plate groups and magnetic dipole patches, the magnetic dipole medium plate groups comprise 8 identical medium plates, every 2 medium plates which are oppositely arranged are in a group, four medium plates are symmetrically and vertically arranged along the rotation of a vertical central axis, and the magnetic dipole patches are printed on the surfaces of the magnetic dipole medium plate groups; the magnetic dipole dielectric plate is provided with a dielectric plate part with a narrower width at the top so as to lead the equivalent transmission line to generate step impedance; the top of the magnetic dipole medium plate group is provided with a medium plate part with a narrower width, the magnetic dipole patches comprise 8 metal patches, the 8 metal patches are respectively arranged on one surface of 1 magnetic dipole medium plate, every two parallel metal patches are in a group, and the two parallel metal patches are respectively vertically arranged right above, right below, right left and right at the central position of the bottom medium plate;
the electric dipole comprises an electric dipole dielectric plate and an electric dipole patch, and the electric dipole patch is printed on the upper surface of the electric dipole dielectric plate to serve as a radiator structure; the electric dipole patches are four metal patches; a horizontal metal strip is printed on the lower surface of the electric dipole dielectric plate; the electric dipole dielectric plates are provided with 8 slots for connecting the magnetic dipole dielectric plate groups and 4 slots for connecting the feed dielectric plates;
the upper surface of the bottom dielectric plate is printed with a metal ground, a plurality of slots are arranged on the bottom dielectric plate, and the magnetic dipole dielectric plate group and the feed dielectric plate group are fixed on the bottom dielectric plate through the slots; the magnetic dipole patch is contacted with the metal ground through the slot; a metallized round via hole is also arranged on the bottom dielectric plate;
the feeding structure comprises a pair of coaxial lines and 5 feeding dielectric plates, wherein the inner surface of each feeding dielectric plate is provided with vertical metal strips, 2 feeding dielectric plates are vertically arranged, the top of each feeding dielectric plate is connected with the electric dipole dielectric plate, and the vertical metal strips are connected with the horizontal metal strips on the lower surface of each electric dipole dielectric plate to form a feeding unit in a polarization direction; the rest feeding medium plates are arranged in the orthogonal direction of the feeding unit, 1 feeding medium plate is horizontally arranged, 2 feeding medium plates are vertically arranged and connected with the horizontal feeding medium plates, and metal strips on the inner surfaces of the medium plates are connected to form the feeding unit in the other polarization direction; the bottoms of all the vertical feed dielectric plates are connected with the bottom dielectric plate; the two feed units are feed microstrip lines with different horizontal heights in two polarization directions and mutually orthogonal, the feed microstrip lines adopt step impedance type eta feed lines, the eta feed lines comprise three sections of step impedance microstrip line patches with different widths, and the eta feed lines are printed on the surfaces of the feed dielectric plates and the lower surfaces of the electric dipole dielectric plates; the outer metal of the pair of coaxial lines is grounded through the edge of the metallized via hole on the bottom dielectric plate, and the inner core of the coaxial lines passes through the bottom dielectric plate and is connected with the metal surface of the microstrip line of the feed structure.
2. The broadband dual-polarized magnetic electric dipole filter antenna according to claim 1 is characterized in that the inherent structure generates a low-frequency radiation zero point I, a high-frequency sideband radiation zero point II is generated by impedance step of an equivalent transmission line caused by a connecting structure of a magnetic dipole patch and an electric dipole patch, the high-frequency radiation zero point III is generated by an eta type feeder line with a feed structure changed from a traditional gamma type to step impedance type, no filter unit is introduced, and the integration of a filter function and an antenna radiation effect is easy to realize.
3. A broadband dual polarized magnetic electric dipole filter antenna according to claim 2, wherein the low frequency radiation null point i is controlled by both the length of the electric dipole patch and the height of the magnetic dipole patch;
the high-frequency sideband radiation zero II is generated by equivalent transmission line step impedance, and is specifically controlled by an SIR structure on a magnetic dipole patch; the magnetic dipole antenna is equivalent to an SIR filter, the transmission zero point of a higher order mode of the SIR filter is controlled by the impedance difference, and the SIR structure of the magnetic dipole patch determines the impedance difference of an equivalent transmission line, so that the position II of the radiation zero point of the high-frequency sideband is determined;
the high-frequency radiation zero point III is controlled by the length and the width of each part of the eta-type feeder line; the feeder lines are provided with a coupling path respectively at two opposite parts of the magneto dipole antenna, 180-degree phase difference is generated between different paths, and the lengths and the widths of different parts of the feeder lines influence the coupling paths so as to control the frequency positions corresponding to the radiation zero points.
4. The broadband dual-polarized magnetic dipole filter antenna according to claim 1, wherein the upper part of said magnetic dipole dielectric plate group is connected with the electric dipole patch through the slot of the electric dipole dielectric plate to form the magnetic dipole antenna.
5. The broadband dual-polarized magnetic dipole filter antenna according to claim 1, wherein said bottom dielectric plate is provided with 8 slots for connecting the magnetic dipole dielectric plate group with the bottom dielectric plate, and said metal ground is connected with the magnetic dipole patch through the slots.
6. The broadband dual-polarized magnetic electric dipole filter antenna according to claim 1, wherein said bottom dielectric plate and said electric dipole dielectric plate are provided with slots for connecting and fixing a feeding dielectric plate, said feeding dielectric plate is printed with feeding microstrip lines, and a part of feeding microstrip lines are printed on the lower surface of said electric dipole dielectric plate.
7. The broadband dual-polarized magnetic electric dipole filter antenna according to claim 1, wherein said bottom dielectric plate is provided with a metallized circular through hole for the coaxial line to pass through and be fixedly connected, the outer metal of the coaxial line is connected with the metal ground, and the inner core of the coaxial line passes through the bottom dielectric plate to be connected with the feed microstrip line.
8. A wideband dual polarized magneto-electric dipole filter antenna according to claim 1 and characterized by covering the LTE network communication band with a bandwidth up to 47.6% as an alternative antenna for base station applications.
9. A wideband dual polarized magnetic dipole filter antenna as claimed in claim 1, wherein said antenna has a low pattern back lobe, a front-to-back ratio of greater than 20dB, a cross polarization level of less than-18 dB, and a stable radiation pattern.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310568784.7A CN116706515A (en) | 2023-05-19 | 2023-05-19 | Broadband dual-polarized magneto-electric dipole filter antenna |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310568784.7A CN116706515A (en) | 2023-05-19 | 2023-05-19 | Broadband dual-polarized magneto-electric dipole filter antenna |
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| CN116706515A true CN116706515A (en) | 2023-09-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202310568784.7A Pending CN116706515A (en) | 2023-05-19 | 2023-05-19 | Broadband dual-polarized magneto-electric dipole filter antenna |
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| CN (1) | CN116706515A (en) |
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