CN114374085A - Dual-polarization hybrid antenna for 5G millimeter wave dual-band application - Google Patents
Dual-polarization hybrid antenna for 5G millimeter wave dual-band application Download PDFInfo
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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
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P7/00—Resonators of the waveguide type
- H01P7/10—Dielectric resonators
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
- H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/50—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
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/20—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements characterised by the operating wavebands
Abstract
The invention relates to a dual-polarized hybrid antenna facing 5G millimeter wave dual-band application, which comprises a first substrate, a second substrate, a metal floor, a third substrate, a fourth substrate and a metal reflector plate which are sequentially stacked from top to bottom, wherein a dielectric sheet is embedded in the center of the first substrate, a metal strip arranged around the dielectric sheet is printed on the upper surface of the first dielectric substrate, two orthogonal H-shaped gaps are formed in the center of the metal floor, an insulating plate is clamped between the third substrate and the fourth substrate, a first feed microstrip line is arranged on the lower surface of the third substrate, a second feed microstrip line is arranged on the upper surface of the fourth substrate, and the first feed microstrip line and the second feed microstrip line are Y-shaped microstrip lines and are respectively orthogonal to the central gaps of the corresponding H-shaped gaps. The invention has the advantages of compact structure, dual polarization, broadband dual frequency band, small size, independently adjustable resonance point, low section and the like.
Description
Technical Field
The invention relates to the field of microwave communication, in particular to a dual-polarized mixed dielectric resonator antenna for 5G millimeter wave dual-band application.
Background
The millimeter wave technology is the most critical technology for realizing high data rate wireless communication in the fifth generation mobile communication system. Currently, the authorized 5G millimeter wave frequency bands worldwide are n257(26.5-29.5GHz), n258(24.25-27.5GHz), n260(37.0-40.0GHz) and n261(27.5-28.35GHz), generally, the n257, n258 and n261 frequency bands are divided into 28GHz frequency bands, and the n260 frequency band is divided into 39GHz frequency bands. The dual-band antenna can reduce the number of antennas in the system, simplify the hardware structure and reduce the cost of the system. The dual-polarized antenna technology utilizes orthogonal electromagnetic wave incoherence and multipath transmission effect of signals, adopts antennas with mutually orthogonal polarizations to work simultaneously in a receiving-transmitting duplex mode, can well solve the problems of multipath fading, polarization mismatch and the like in electromagnetic wave transmission, and improves the communication capacity of a system. Under the background, in the technical field of antennas, designing a dual-band and dual-polarization antenna capable of covering 28/39GHz millimeter waves has important research significance.
The hybrid antenna based on the dielectric resonator is an antenna combining the dielectric resonator with other radiation structures, and is an effective solution for realizing the millimeter wave dual-band antenna. Not only because it has a plurality of resonators of compact structure, but also inherits many advantages of dielectric resonator, such as easy excitation, flexible design, high radiation efficiency because of no conductor loss in millimeter wave frequency band, etc.
The applicant submits an application (CN113410631A) about a hybrid antenna for 5G millimeter wave dual-band application to the national institute, which can realize millimeter wave dual-band broadband coverage while having excellent characteristics of low profile and small plane size, can be conveniently expanded to a beam scanning antenna array, and has great practical value. However, the millimeter wave dual-band antenna has a problem that dual polarization cannot be realized. The existing antenna for realizing dual polarization has narrower bandwidth and two frequency bands are not easy to be adjusted independently; or the existing antenna for realizing dual polarization and dual frequency bands has the problem of overlarge antenna size, and the application requirement of the beam scanning array of the millimeter wave cellular network cannot be met.
Disclosure of Invention
The invention aims to solve the problems that the conventional millimeter wave antenna is narrow in bandwidth, large in plane size, incapable of realizing dual polarization, difficult to independently adjust each frequency band and the like, and provides a dual-polarization mixed antenna for 5G millimeter wave dual-band application, so that the 5G millimeter wave dual-band and dual-polarization application is realized.
In order to achieve the purpose of the invention, the dual-polarized hybrid antenna facing the 5G millimeter wave dual-band application comprises a first substrate, a second substrate, a metal floor, a third substrate, a fourth substrate and a metal reflecting plate which are sequentially stacked from top to bottom, and is characterized in that: the middle of the first substrate is embedded with a dielectric sheet, the upper surface of the first dielectric substrate is printed with a metal strip covering the dielectric sheet or arranged around the dielectric sheet, the middle of the metal floor is provided with two orthogonal H-shaped gaps, an insulating plate is clamped between the third substrate and the fourth substrate, the lower surface of the third substrate is provided with a first feed microstrip line for feeding the first port, the upper surface of the fourth substrate is provided with a second feed microstrip line for feeding the second port, and the first feed microstrip line and the second feed microstrip line are Y-shaped microstrip lines and are respectively orthogonal to the central gaps of the corresponding H-shaped gaps.
The dielectric sheet, the first substrate and the second substrate form a laminated dielectric resonator.
Preferably, a metalized through hole penetrating through the second substrate and extending downwards to the metal reflecting plate is arranged around the metal strip to form the substrate integrated waveguide back cavity.
Preferably, metallized through holes penetrating through the third substrate and extending downwards to the metal reflecting plate are respectively arranged in four quadrants of the two orthogonal H-shaped slots so as to improve the isolation between the antenna polarizations.
Preferably, the left and right sides of the transmission line part of the first feed microstrip line and the transmission line part of the second feed microstrip line are respectively provided with a plurality of metal holes which penetrate through the third substrate and extend downwards to form the substrate integrated coaxial line.
Firstly, two mutually perpendicular H-shaped gaps are etched on a metal floor, and form a gap coupling structure with a first feed microstrip line and a second feed microstrip line, and the structure can well excite an orthogonal mode of a whole antenna radiation unit so as to realize the dual polarization characteristic; secondly, metal holes are respectively introduced into the left side and the right side of the first feed microstrip line and the second feed microstrip line, and the metal holes, the substrate and the ground form a substrate integrated coaxial line together to reduce the loss of the feeder line in the transmission process; finally, a metal hole is added between two mutually perpendicular H-shaped gaps to improve the isolation between two mutually perpendicular linear polarizations generated by the antenna.
In the present invention, an antenna is designed by using a low-profile laminated dielectric resonator in which a dielectric sheet having a high dielectric constant is bonded to a dielectric substrate having a low dielectric constant, and a fundamental mode (TE) of the dielectric resonator is excited in a 39GHz band through a gap111) And higher order mode (TE)131) These two modes; meanwhile, the slot is used as a radiating unit to provide a resonance point in the 28GHz frequency band; on the basis, a resonance point is added in the 28GHz frequency band in a mode of printing a metal strip on the top layer of the antenna so as to further expand the bandwidth of the low-frequency band. Therefore, two resonance points exist in both the 28GHz band and the 39GHz band, thereby realizing the millimeter wave dual-band broadband design and successfully covering several millimeter wave bands of n257, n260 and n261 bands. Finally, matching branches are respectively introduced to the first feeder line and the second feeder line to adjust impedance matching in each polarization direction. The invention adopts a design scheme of a hybrid antenna, has compact structure and smaller plane size, and the plane size of the antenna is 0.37 lambda0×0.37λ0(～λ0@28GHz) and can therefore be conveniently extended to beam scanning antenna arrays. Compared with other schemes of millimeter wave antenna, the invention has compact structure, dual polarization, dual frequency band, small size, independently adjustable resonance point, and small sizeLow surface area and the like.
In conclusion, the invention has the following characteristics:
1. a low-profile laminated dielectric resonator structure is introduced, which comprises a dielectric sheet with high dielectric constant and a relatively thick dielectric substrate with low dielectric constant; TE of dielectric resonator obtained by feeding the laminated dielectric resonator with H-shaped gap111And TE131The two resonant modes enable the dielectric resonator antenna to have dual-mode working characteristics, and broadband coverage of millimeter wave 39GHz frequency band is realized. Two mutually perpendicular 'H' type feed gaps enable the dielectric resonator part of the hybrid antenna to generate orthogonal modes, and the dual-polarization characteristic of the hybrid antenna at 39GHz is achieved.
2. Two mutually perpendicular H-shaped gaps are etched on the metal floor, and the gaps generate a resonance point at 28GHz, so that the millimeter wave dual-frequency characteristic of the hybrid antenna is realized; the two mutually perpendicular H-shaped slots realize the dual-polarization characteristic of the slot part of the hybrid antenna at 28GHz, and metal through holes are further added around the slots to improve the isolation between two polarizations of the antenna.
3. By printing the metal strip on the upper surface of the first dielectric substrate 3, a resonance mode is added at the 28GHz frequency band of the millimeter wave, and meanwhile, the area, the volume or the weight of the antenna are not remarkably increased, the resonance mode does not affect other resonance modes of the hybrid antenna, the impedance bandwidth of the 28GHz frequency band is remarkably expanded, and the broadband coverage of the millimeter wave 28GHz frequency band of the hybrid antenna is realized; two mutually perpendicular 'H' type feed gaps enable the metal strip part of the hybrid antenna to generate orthogonal modes, and the dual-polarization characteristic of the hybrid antenna at 28GHz is achieved.
4. A layer of substrate (a fourth substrate 14) and a reflecting ground 16 are introduced below the Y-shaped feeder line, metal through holes are added around the feeder line to form a substrate integrated coaxial line structure, the transmission loss of the feeder line is reduced, and the antenna is easy to further integrate and process.
5. The antenna design can simultaneously comprise two hot spot millimeter wave frequency bands of 28GHz and 39GHz, but is not limited to the 28GHz and 39GHz frequency bands, and the design technology can be applied to other 5G frequency bands.
Drawings
The invention will be further described with reference to the accompanying drawings.
Fig. 1 is a three-dimensional exploded view of the hybrid antenna of the present invention.
Fig. 2 is a side view of the hybrid antenna of the present invention.
Fig. 3 is a top perspective view of the hybrid antenna of the present invention.
Fig. 4 is a perspective view of the middle layer of the hybrid antenna of the present invention (metal floor down).
Fig. 5 is a perspective view of the middle layer of the hybrid antenna of the present invention (with the insulating adhesive sheet 18 down).
Fig. 6 is a perspective view of the middle layer of the hybrid antenna of the present invention (fourth substrate 14 down).
FIG. 7 is | S of a hybrid antenna according to an embodiment of the present invention11And l, a simulation result.
Fig. 8 is a simulation result of the hybrid antenna according to the embodiment of the present invention.
Fig. 9 is the result of isolation simulation of the hybrid antenna according to the embodiment of the present invention.
Fig. 10 shows the 27GHz simulated directivity pattern of the hybrid antenna according to the embodiment of the present invention, (a) a port directional pattern, and (b) a port two-directional pattern.
Fig. 11 is a 29GHz simulated directional pattern of a hybrid antenna according to an embodiment of the present invention, wherein (a) is a port directional pattern, and (b) is a port two directional pattern.
Fig. 12 shows the simulated 37GHz directivity pattern of the hybrid antenna according to the embodiment of the present invention, i.e., (a) a port directional pattern, and (b) a port two directional pattern.
Fig. 13 shows the 39GHz simulated directivity pattern of the hybrid antenna of the embodiment of the present invention, (a) a port directional pattern, and (b) a port two directional pattern.
Detailed Description
The invention is further described with reference to the following figures and specific embodiments.
As shown in fig. 1 to 2, the dual-polarized hybrid antenna of the present embodiment for 5G millimeter wave dual-band application includes: the metal floor board comprises a first substrate 3, a second substrate 5, a metal floor board 8, a third substrate 9, a fourth substrate 14 and a metal reflecting board 16 which are sequentially stacked from top to bottom, wherein a medium sheet 2 is embedded in the center of the first substrate 3, and four fold-line-shaped metal strips 1 arranged around the medium sheet 2 are printed on the upper surface of the first substrate 3. The metal strip 1 can also be designed as a rectangular metal patch covering the dielectric sheet 2, but in the form of direct coverage, the bandwidth of the antenna is narrowed and is not optimal. The dielectric constant of the dielectric sheet 2 is higher than the dielectric constants of the first substrate 3 and the second substrate 5, so that the dielectric sheet 2, and the first substrate 3 and the second substrate 5 constitute a laminated dielectric resonator. The second substrate 5 and the metal floor 8 are bonded and fixed by an adhesive plate 17.
The metal floor 8 is provided with two orthogonal H-shaped gaps 6 at the center, an insulating adhesive plate 18 is clamped between a third substrate 9 and a fourth substrate 14, a first feed microstrip line 10 for feeding a first port is arranged on the lower surface of the third substrate 9, and a second feed microstrip line 13 for feeding a second port is arranged on the upper surface of the fourth substrate 14. As shown in the figure, in the present embodiment, the first feeding microstrip line 10 and the second feeding microstrip line 13 are Y-shaped microstrip lines 10 and are respectively orthogonal to the central slot of the corresponding H-shaped slot 6. The etched mutually perpendicular 'H' -shaped slot on the metal floor 8, the first feed microstrip line 10 and the second feed microstrip line 13 form a slot coupling structure, and the structure can well excite the orthogonal mode of the whole antenna radiation unit so as to realize the dual-polarization characteristic.
In this embodiment, a metallized through hole penetrating through the second substrate 5 and extending downward to the metal reflector 16 is formed around the metal strip 1 to form the substrate integrated waveguide back cavity 4. The upper surfaces of the metallized through holes are connected through metal strips respectively, and as shown in the figure, the metal strips are L-shaped and are respectively arranged at four peripheral corners of the metal strip 1. The metallized through hole is used for suppressing surface waves and improving the gain of the antenna.
In this embodiment, the dielectric constant of the low-dielectric-constant dielectric substrate is 3.55, the loss angle is 0.0027, the thickness of the first dielectric substrate is 0.203mm, the thickness of the second dielectric substrate is 0.508mm, and the thickness of the third dielectric substrate is 0.305 mm; the high dielectric constant dielectric sheet had a dielectric constant of 45, a loss angle of 0.00019 and a thickness of 0.305 mm. Whole section height 1.5mm (E;)0.14λ0@28GHz), planar dimension 0.37 λ0×0.37λ0(～λ0@28 GHz). The feeding position of the first feeding microstrip line 10 in the X-axis direction is set as a first port, and the feeding position of the second feeding microstrip line 13 in the Y-axis direction is set as a second port.
On the basis, as shown in fig. 1, 5 and 6, the first matching stub 11 is disposed on the first feeding microstrip line 10, and the second matching stub 15 is disposed on the second feeding microstrip line 13, so as to improve the overall impedance matching of the hybrid antenna.
As shown in fig. 1 and 4, metallized through holes 7 penetrating through the third substrate 9 and extending downward to the metal reflector 16 are respectively arranged in four quadrants of the two orthogonal H-shaped slots 6 to improve the isolation between the antenna polarizations. The left and right sides of the transmission line part of the first feed microstrip line 10 and the transmission line part of the second feed microstrip line 13 are respectively provided with a plurality of metal holes which penetrate through the third substrate 9 and extend downwards to form a substrate integrated coaxial line 12, so that the radiation loss generated by the feeder line in the transmission process is reduced. The invention can realize millimeter wave dual-band broadband coverage, simultaneously has the excellent characteristics of dual polarization and miniaturization, can be conveniently expanded into a beam scanning antenna array, and has high practical value.
In this example, the dielectric sheet 2 is rectangular and the metallized through holes are disposed around the dielectric sheet 2. The coupling slot 6 is an H-shaped coupling feed slot, and the central slot is parallel to the x axis and the y axis respectively.
The metal floor 8 is a metal strip-gap-dielectric resonator mixed integral structure provided by the invention. First, the high dielectric constant dielectric sheet 2 positioned at the uppermost layer constitutes a multilayer dielectric resonator antenna together with the first dielectric substrate 3 and the second dielectric substrate 5 having a low dielectric constant. The radio frequency excitation signal is fed in by a first feed microstrip line 10 and a second feed microstrip line 13 which are mutually vertical at the bottom layer, and the antenna structure positioned on the feed microstrip line is fed through the coupling of an H-shaped slot 6. In the structure, the feed gap is also used as a radiating unit to provide a resonance point to work in a 28GHz frequency band; the metal strip 1 on the upper surface of the first substrate 3 may produce anotherThe resonance point works in a 28GHz frequency band; the dielectric sheet located in the middle of the second substrate 5 may create a fundamental mode (TE)111) And higher order mode (TE)131) Two resonance points work in a 39GHz frequency band; therefore, each frequency band has two resonance points, so that the working effect of millimeter wave dual-frequency band broadband is realized; on the basis, a matching branch 10 and a matching branch 15 are further respectively introduced to the two feed microstrip lines to improve the overall impedance matching of the hybrid antenna.
Specific parameters of the dual-polarized hybrid antenna of the present embodiment are given in table I.
Table I detailed dimensions of the antenna
The key point of the invention is that the metal floor is etched with two mutually perpendicular H-shaped gaps to simultaneously excite three radiation structures of the metal strip-gap-dielectric resonator to generate an orthogonal mode, so that the dual-polarization characteristic of the antenna is realized, and each frequency band in each polarization direction has two resonance points, so that the broadband working effect of two 5G millimeter wave hot frequency bands of 28GHz and 39GHz is realized. The invention adopts a laminated dielectric resonator structure, and the metal patch printed on the upper surface of the (3) has little influence on the cross-sectional height of the antenna, so the antenna has low cross-sectional height, and the whole height of the antenna is only 1.5mm (-0.14 lambda)0@28 GHz); multiple radiation units are mixed under the same structure, the structure is compact, the mixing can be realized only by smaller unit plane size, and the unit plane size is 0.37 lambda0×0.37λ0(～λ0@28GHz), the invention can therefore be conveniently extended to beam scanning antenna arrays.
The simulation software HFSS was used to simulate the antenna of this example. The transmission response of the antenna is shown in fig. 7 as | S11The standard of | ≦ 10dB, the bandwidth range of the port one excitation is 25.68-30.32GHz (relative bandwidth is-16.57%), 36.45-41.02GHz (relative bandwidth is-11.81%), the bandwidth range of the port two excitation is 25.82-30.42GHz (relative bandwidth is-16.36%), 36.43-40.92GHz (relative bandwidth is-16.36%)11.62%) can well cover the three 5G millimeter wave hot spot frequency bands of n257, n261 and n260, and the broadband coverage of the millimeter wave dual-band is realized. From the radiation response diagram of fig. 8, it can be known that the average gains in the frequency bands generated by the antenna after the two ports are excited respectively are all above 6 dBi. The results of the isolation simulation for antenna port one and port two of fig. 9 show that the in-band isolation is better than-17 dB. Fig. 10-13 show the simulated directional diagram of the antenna. In fig. 10, (a) is the antenna simulation pattern at 27GHz for port one excitation, and (b) is the antenna simulation pattern at 27GHz for port two excitation; in fig. 11, (a) is the antenna simulation pattern at 29GHz for port one excitation, and (b) is the antenna simulation pattern at 29GHz for port two excitation; in fig. 12, (a) is the antenna simulation pattern at 37GHz for port one excitation, and (b) is the antenna simulation pattern at 37GHz for port two excitation; in fig. 13, (a) is the antenna simulation pattern at 39GHz for port one excitation, and (b) is the antenna simulation pattern at 39GHz for port two excitation; it can be known from the figure that the directional diagrams of the antenna under the same frequency band corresponding to the excited port are similar, which shows that the antenna has good dual-polarization characteristic, and all the directional diagrams have symmetrical structure, and the cross polarization is better than 15dB in the 3-dB wave beam range.
In addition to the above embodiments, the present invention may have other embodiments. All technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope of the claims of the present invention.
Claims (10)
1. The utility model provides a dual polarization hybrid antenna towards 5G millimeter wave dual band application, includes first base plate (3), second base plate (5), metal floor (8), third base plate (9), fourth base plate (14) and metal reflecting plate (16) that top-down stacked gradually the setting, its characterized in that: the dielectric sheet (2) is embedded in the center of the first substrate (3), the metal strip (1) which covers the dielectric sheet (2) or is arranged around the dielectric sheet (2) is printed on the upper surface of the first dielectric substrate (3), two orthogonal H-shaped gaps (6) are formed in the center of the metal floor (8), an insulating adhesive plate (18) is clamped between the third substrate (9) and the fourth substrate (14), a first feed microstrip line (10) for feeding a first port is arranged on the lower surface of the third substrate (9), a second feed microstrip line (13) for feeding a second port is arranged on the upper surface of the fourth substrate (14), and the first feed microstrip line (10) and the second feed microstrip line (13) are Y-shaped microstrip lines (10) and are orthogonal to the central gaps of the corresponding H-shaped gaps (6) respectively.
2. The dual polarized hybrid antenna for 5G millimeter wave dual band applications according to claim 1, wherein: and metallized through holes penetrating through the second substrate (5) and extending downwards to the metal reflecting plate (16) are arranged around the metal strip (1) to form a substrate integrated waveguide back cavity (4).
3. The dual polarized hybrid antenna for 5G millimeter wave dual band applications according to claim 2, wherein: the upper surfaces of the adjacent metallized through holes are connected through metal strips, and the metal strips are L-shaped and are respectively arranged at four peripheral corners of the metal strip (1).
4. The dual polarized hybrid antenna for 5G millimeter wave dual band applications according to claim 1, wherein: the first feed microstrip line (10) is provided with a first matching branch (11), and the second feed microstrip line (13) is provided with a second matching branch (15).
5. The dual polarized hybrid antenna for 5G millimeter wave dual band applications according to claim 1, wherein: the metal strips (1) are four fold-line-shaped metal strips arranged around the medium sheet (2).
6. The dual polarized hybrid antenna for 5G millimeter wave dual band applications according to claim 5, wherein: the medium sheet (2) is square, and the medium sheet (2) surrounded by the metalized through holes is arranged at the periphery.
7. The dual polarized hybrid antenna for 5G millimeter wave dual band applications according to claim 1, wherein: and metallized through holes (7) which penetrate through the third substrate (9) and extend downwards to the metal reflecting plate (16) are respectively arranged in four quadrants of the two orthogonal H-shaped gaps (6) so as to improve the isolation between antenna polarizations.
8. The dual polarized hybrid antenna for 5G millimeter wave dual band applications according to claim 1, wherein: the left side and the right side of the transmission line part of the first feed microstrip line (10) and the transmission line part of the second feed microstrip line (13) are respectively provided with a plurality of metal holes which penetrate through the third substrate (9) and extend downwards to form a substrate integrated coaxial line (12).
9. The dual polarized hybrid antenna for 5G millimeter wave dual band applications according to claim 1, wherein: the dielectric constant of the dielectric sheet (2) is higher than the dielectric constant of the first substrate (3) and the second substrate (5), and the dielectric sheet (2), the first substrate (3) and the second substrate (5) form a laminated dielectric resonator.
10. The dual polarized hybrid antenna for 5G millimeter wave dual band applications according to claim 1, wherein: the second substrate (5) and the metal floor (8) are fixedly bonded through a bonding plate (17).
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| WO2024067101A1 (en) * | 2022-09-29 | 2024-04-04 | 中兴通讯股份有限公司 | Dielectric antenna array and integrated preparation method |
| CN117394027A (en) * | 2023-12-12 | 2024-01-12 | 华南理工大学 | Dual-frequency self-isolation in-band full-duplex super-surface antenna and design method thereof |
| CN117394027B (en) * | 2023-12-12 | 2024-03-08 | 华南理工大学 | Dual-frequency self-isolation in-band full-duplex super-surface antenna and design method thereof |
| CN117791121A (en) * | 2024-02-27 | 2024-03-29 | 广东工业大学 | Low-profile high-isolation duplex dual-polarized patch antenna |
| CN117791121B (en) * | 2024-02-27 | 2024-04-30 | 广东工业大学 | Low-profile high-isolation duplex dual-polarized patch antenna |
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| CN114374085B (en) | 2023-07-21 |
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