EP3454414A1 - Broadband low-profile dual-linearly polarized antenna for a onelte two-in-one platform - Google Patents
Broadband low-profile dual-linearly polarized antenna for a onelte two-in-one platform Download PDFInfo
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- EP3454414A1 EP3454414A1 EP18193154.4A EP18193154A EP3454414A1 EP 3454414 A1 EP3454414 A1 EP 3454414A1 EP 18193154 A EP18193154 A EP 18193154A EP 3454414 A1 EP3454414 A1 EP 3454414A1
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- linearly polarized
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- broadband low
- polarized antenna
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- 230000010287 polarization Effects 0.000 claims description 7
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 230000005855 radiation Effects 0.000 description 10
- 238000005388 cross polarization Methods 0.000 description 4
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 238000002955 isolation Methods 0.000 description 3
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- 238000012986 modification Methods 0.000 description 2
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- 238000012938 design process Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
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- 238000012360 testing method Methods 0.000 description 1
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Classifications
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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
- H01Q5/30—Arrangements for providing operation on different wavebands
- H01Q5/378—Combination of fed elements with parasitic elements
- H01Q5/385—Two or more parasitic elements
-
- 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
-
- 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
-
- 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
- H01Q21/26—Turnstile or like antennas comprising arrangements of three or more elongated elements disposed radially and symmetrically in a horizontal plane about a common centre
-
- 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
- H01Q9/16—Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole
- H01Q9/26—Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole with folded element or elements, the folded parts being spaced apart a small fraction of operating wavelength
Definitions
- the present application generally relates to a broadband low-profile dual-linearly polarized antenna and, more specifically, to a broadband low-profile dual-linearly polarized antenna for a OneLTE two-in-one platform.
- OneLTE technology is rapidly emerging.
- OneLTE refers to simultaneously comprising both TD-LTE and LTE FDD wireless network access modes and a shared core network in an LTE network.
- the two wireless network access modes complement each other and cooperate with each other to achieve site-level convergence, network interoperability, and performance level integration on a network side, thereby maximizing overall network capacity and coverage.
- Operators can, thus, use all of their own spectrum, including TDD and FDD, to provide a unified 4G network experience.
- existing dual-linearly polarized antennas for OneLTE typically include two radiating portions (i.e., 1.8 GHz for FDD and 2.6 GHz for TDD) because neither has sufficient bandwidth.
- the dual-linearly polarized antenna disclosed by the U.S. Patent No. 3,740,754 the first of its kind to describe a dual-linearly polarized antenna, just cannot meet the needs of a wide frequency band. Therefore, such antennas for OneLTE are bulky and do not meet requirements for miniaturization.
- there is a fairly obvious mutual coupling between the high and low frequency radiating portions causing distortion of the radiation pattern of the radiating portions of the different frequency bands.
- a broadband low-profile dual-linearly polarized antenna can include (1) a radiating portion that can include a dielectric substrate, printed folded dipoles spaced apart on an upper surface of the dielectric substrate, first coupled parasitic elements on a lower surface of the dielectric substrate, and second coupled parasitic elements on the upper surface of the dielectric substrate and (2) a feed balun for feeding the radiating portion, wherein each of the printed folded dipoles can include a corresponding one of the first coupled parasitic elements and a corresponding one of the second coupled parasitic elements.
- a broadband low-profile dual-linearly polarized antenna array device can include (1) a plurality of the above-described dual-linearly polarized antennas, (2) a feed network that can include a power divider for feeding the plurality of dual-linearly polarized antennas in equal amplitude and in same phase, wherein the feed network can include two feed ports for respectively exciting a ⁇ 45° polarization mode to feed each of the plurality of dual-linearly polarized antennas through the power divider, and (3) a bottom metal reflector.
- a broadband low-profile dual-linearly polarized antenna as shown in FIG. 1 and FIG. 2 can include a radiating portion 1 and a feed balun 2.
- the radiating portion 1 can have a rectangular plate shape, and the feed balun 2 can be located at a center below the radiating portion 1.
- the feed balun 2 can be placed on a feed circuit board 3.
- the feed balun 2 can include a first balun 8 and a second balun 9 that are orthogonal to each other and can be connected to a lower surface of the radiating portion 1 to feed the radiating portion 1.
- Two plates of the feed balun 2 can be snapped together through a middle slot, wherein an upper end of a middle part of one of the two plates can have a short slot, and a lower end of a middle part of another of the two plates can have a long slot, thereby implementing the feed balun 2 through a mating connection of the long slot and the short slot.
- the radiation portion 1 can include a dielectric substrate, printed folded dipoles 7 spaced apart on an upper surface of the dielectric substrate, first coupled parasitic elements 4 on a lower surface of the dielectric substrate, and second coupled parasitic elements 5 on the upper surface of the dielectric substrate.
- the radiating portion 1 can be implemented on a printed circuit board by a printing process.
- the printed folded dipoles 7 may be placed at equal or unequal intervals on the dielectric substrate. As shown in FIG. 3 , a number of the printed folding dipoles 7 can be four, and the printed folding dipoles 7 can be placed at equal intervals of 90 degrees. As further shown in FIG. 3 , each of the printed folded dipoles 7 can have a respective T-shaped match and have a respective T-shaped slit inside to form a respective current path. In some embodiments, shapes of such T-shaped slits inside of the printed folded dipoles 7 need not be totally identical.
- a top of the T-shaped slits inside of upper and lower ones of the printed folding dipoles 7 can be narrower than a top of the T-shaped slits inside of left and right ones of the printed folding dipoles 7.
- Each of the printed folded dipoles 7 can include a corresponding one of the first coupled parasitic elements 4 and a corresponding one of the second coupled parasitic elements 5 on either side, wherein the first coupled parasitic elements 4 are on the lower surface of the dielectric substrate, and the second coupled parasitic elements 5 are on the upper surface of the dielectric substrate.
- the first and second coupled parasitic elements 4, 5 can be used to expand bandwidth and reduce a profile of the broadband low-profile dual-linearly polarized antenna.
- Each of the printed folded dipoles 7 can be non-electrically connected to the corresponding one of the first and second coupled parasitic elements 4, 5, but inductively induce current on the corresponding one of the first and second coupled parasitic elements 4, 5.
- Positions of the first and second coupled parasitic elements 4, 5 can be reasonably arranged according to requirements of inductive coupling. Accordingly, the specific shapes of the first and second coupled parasitic elements 4, 5 shown in FIG. 3 and FIG. 4 act only as an example, but not a limitation.
- the first coupled parasitic elements 4 can be generally shaped as " ⁇ ”, “ ⁇ ”, “ ⁇ ”, and “ ⁇ ”, and each of the first coupled parasitic elements 4 can be located between respective ones of the adjacent ones of the printed folded dipoles 7 with a respective notch facing inward.
- each of the first coupled parasitic elements 4 can be located inside of respective outer contours the respective ones of the adjacent ones of the printed folded dipoles 7, and in some embodiments, each of the first coupled parasitic elements 4 can be located right below respective inner sides of the respective small opening between the respective ones of the adjacent ones of the printed folded dipoles 7.
- each of the second coupled parasitic elements 5 can include two respective rectangular strips that need not be electrically connected in substantially the shape of the Chinese character " " and can be placed adjacent to respective neighboring portions of respective outer edges the respective ones of the adjacent ones of the printed folded dipoles 7.
- such rectangular strips can be different sizes, and a long side can be parallel to the respective outer edges of one of the printed folded dipoles 7.
- Each of the printed folded dipoles 7 can have a corresponding feed point 6 located therein, and the feed balun 2 can feed each of the printed folded dipoles 7 through the corresponding feed point 6 in a manner of coupled feed.
- FIG. 5(a) is a side view of portions of the first and second baluns 8, 9 of the feed balun 2 (other portions of the baluns 8, 9 are obscured).
- a middle of the second balun 9 can include a recess to bypass the first balun 8 to avoid electrical connection (or, alternatively, to form a protrusion).
- FIG. 5(b) and FIG. 5(c) show the portions of the first and second baluns 8, 9 that are obscured in FIG. 5(a) .
- shapes of the first and second baluns 8, 9 need not be the same, but both can be substantially " " " in shape and feed the radiating portion 1 at the top through a coupling manner.
- the bottom of the feed balun 2 can be connected to a feed circuit.
- the feed circuit can be implemented using a microstrip circuit.
- FIG. 6 is a view of a broadband low-profile dual-linearly polarized antenna array device in accordance with disclosed embodiments.
- FIG. 6 only shows two dual-linearly polarized antennas, but embodiments disclosed herein are not so limited, and such an antenna array device can include any number of dual-linearly polarized antennas as appropriate.
- a feed network can feed the antenna array device.
- the feed network can include a one-to-two power divider so as to feed each of the dual-linearly polarized antennas with equal amplitude and same phase.
- the feed network can have two feed ports (i.e., port A and port B shown in FIG. 6 ) for respectively exciting two polarization modes of ⁇ 45° to feed each of the dual-linearly polarized antennas through the one-to-two power divider.
- the antenna array device may also include a bottom metal reflector, and the feed network may be located above the bottom metal reflector.
- the bottom metal reflector can be made of a metal plate, such as a copper plate, and can have a metal flange.
- the antenna array device may include a radome.
- standing wave ratios can be 1.7 or less, regardless of port A or port B.
- isolation of port A and port B can be kept below -25 dB.
- FIG. 9(a), FIG. 9(b) , FIG. 9(c), FIG. 9(d) , FIG. 10(a), FIG. 10(b) , FIG. 10(c), and FIG. 10(d) for port A or port B, an influence of frequency variation on radiation directivity of the broadband low-profile dual-linearly polarized antenna is not obvious, and radiant energy is mainly concentrated in the horizontal front.
- FIG. 9(a), FIG. 9(b) , FIG. 9(c), FIG. 9(d) , FIG. 10(a), FIG. 10(b) , FIG. 10(c), and FIG. 10(d) when the frequency is around 1.8 GHz and 2.6 GHz, gains of port A and port B can both be maintained above 10 dBi, and efficiencies can both be maintained above 80%.
- the broadband low-profile dual-linearly polarized antenna and the antenna array device disclosed herein can effectively realize a low-profile (reducing antenna thickness of about 35 mm in conventional cross-polarized antennas to 19 mm), can implement a wide frequency band of 1700 MHz to 2700 MHz, and can achieve high gain, high efficiency, high cross-polarization ratio, and high isolation. Furthermore, the broadband low-profile dual-linearly polarized antenna and the antenna array device disclosed herein have such advantages as simple structure, neat appearance, easy engineering implementation, and suitability for mass production.
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- Engineering & Computer Science (AREA)
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- Variable-Direction Aerials And Aerial Arrays (AREA)
Abstract
Description
- This application claims priority to Chinese Patent Application No.
201710804959.4 filed September 8, 2017 201710804959.4 - The present application generally relates to a broadband low-profile dual-linearly polarized antenna and, more specifically, to a broadband low-profile dual-linearly polarized antenna for a OneLTE two-in-one platform.
- Currently, OneLTE technology is rapidly emerging. OneLTE refers to simultaneously comprising both TD-LTE and LTE FDD wireless network access modes and a shared core network in an LTE network. The two wireless network access modes complement each other and cooperate with each other to achieve site-level convergence, network interoperability, and performance level integration on a network side, thereby maximizing overall network capacity and coverage. Operators can, thus, use all of their own spectrum, including TDD and FDD, to provide a unified 4G network experience.
- However, existing dual-linearly polarized antennas for OneLTE typically include two radiating portions (i.e., 1.8 GHz for FDD and 2.6 GHz for TDD) because neither has sufficient bandwidth. For example, the dual-linearly polarized antenna disclosed by the
U.S. Patent No. 3,740,754 , the first of its kind to describe a dual-linearly polarized antenna, just cannot meet the needs of a wide frequency band. Therefore, such antennas for OneLTE are bulky and do not meet requirements for miniaturization. Furthermore, in these antennas, there is a fairly obvious mutual coupling between the high and low frequency radiating portions, causing distortion of the radiation pattern of the radiating portions of the different frequency bands. - Although some two-in-one broadband antennas satisfying the 1.8GHz and 2.6GHz frequency bands of OneLTE have appeared in academic papers or industrial products, the thickness of these antennas is usually about 35mm, which cannot meet the requirements for smaller, lighter, broader, and greener antennas in the industrial design process of OneLTE base stations.
- Therefore, it is desirable to overcome the defects and deficiencies in the prior art, by providing a broadband low-profile dual-linearly polarized antenna that satisfies miniaturization for a OneLTE two-in-one platform.
- In order to solve the above-identified problems, embodiments of the disclosed invention adopt the following technical solutions.
- According to some embodiments, a broadband low-profile dual-linearly polarized antenna is provided that can include (1) a radiating portion that can include a dielectric substrate, printed folded dipoles spaced apart on an upper surface of the dielectric substrate, first coupled parasitic elements on a lower surface of the dielectric substrate, and second coupled parasitic elements on the upper surface of the dielectric substrate and (2) a feed balun for feeding the radiating portion, wherein each of the printed folded dipoles can include a corresponding one of the first coupled parasitic elements and a corresponding one of the second coupled parasitic elements.
- Furthermore, according to some embodiments, a broadband low-profile dual-linearly polarized antenna array device is provided that can include (1) a plurality of the above-described dual-linearly polarized antennas, (2) a feed network that can include a power divider for feeding the plurality of dual-linearly polarized antennas in equal amplitude and in same phase, wherein the feed network can include two feed ports for respectively exciting a ±45° polarization mode to feed each of the plurality of dual-linearly polarized antennas through the power divider, and (3) a bottom metal reflector.
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FIG. 1 is an elevation view of a broadband low-profile dual-linearly polarized antenna in accordance with disclosed embodiments; -
FIG. 2 is a side view of a broadband low-profile dual-linearly polarized antenna in accordance with disclosed embodiments; -
FIG. 3 is a top view of a radiating portion of a broadband low-profile dual-linearly polarized antenna in accordance with disclosed embodiments; -
FIG. 4 is a bottom view of a radiating portion of a broadband low-profile dual-linearly polarized antenna in accordance with disclosed embodiments; -
FIG. 5(a) is a side view of first and second baluns of a feed balun of a broadband low-profile dual-linearly polarized antenna in accordance with disclosed embodiments with portions thereof obscured; -
FIG. 5(b) is a side view of the first and second baluns of the feed balun of the broadband low-profile dual-linearly polarized antenna that shows the portions obscured inFIG. 5(a) ; -
FIG. 5(c) is a side view of first and second baluns of a feed balun of the broadband low-profile dual-linearly polarized antenna that shows the portions obscured inFIG. 5(a) ; -
FIG. 6 is a view of a broadband low-profile antenna array device in accordance with disclosed embodiments that includes broadband low-profile dual-linearly polarized antennas as shown inFIG. 1 and FIG. 2 ; -
FIG. 7(a) is a graph of a standing wave ratio curve of port A of the broadband low-profile antenna array device shown inFIG. 6 ; -
FIG. 7(b) is a graph of a standing wave ratio curve of port B of the broadband low-profile antenna array device shown inFIG. 6 ; -
FIG. 8 is a graph of an isolation curve of port A and port B of the broadband low-profile antenna array device shown inFIG. 6 ; -
FIG. 9(a) is a graph of antenna performance for port A of the broadband low-profile antenna array device shown inFIG. 6 and illustrates the horizontal section radiation pattern; -
FIG. 9(b) is a graph of antenna performance for port A of the broadband low-profile antenna array device shown inFIG. 6 and illustrates the vertical section radiation pattern; -
FIG. 9(c) is a graph of antenna performance for port A of the broadband low-profile antenna array device shown inFIG. 6 and illustrates the gain curve; -
FIG. 9(d) is a graph of antenna performance for port A of the broadband low-profile antenna array device shown inFIG. 6 and illustrates the efficiency curve; -
FIG. 10(a) is a graph of antenna performance for port B of the broadband low-profile antenna array device shown inFIG. 6 and illustrates the horizontal section radiation pattern; -
FIG. 10(b) is a graph of antenna performance for port B of the broadband low-profile antenna array device shown inFIG. 6 and illustrates the vertical section radiation pattern; -
FIG. 10(c) is a graph of antenna performance for port B of the broadband low-profile antenna array device shown inFIG. 6 and illustrates the gain curve; -
FIG. 10(d) is a graph of antenna performance for port B of the broadband low-profile antenna array device shown inFIG. 6 and illustrates the efficiency curve; -
FIG. 11(a) is a graph of the horizontal section radiation patterns of main polarization and cross polarization for port A of the broadband low-profile antenna array device shown inFIG. 6 ; and -
FIG. 11(b) is a graph of the horizontal section radiation patterns of main polarization and cross polarization for port B of the broadband low-profile antenna array device shown inFIG. 6 . - The specific embodiments of the disclosed invention will be described in detail below with reference to the accompanying drawings in order to make the above objectives, features, and advantages of the disclosed invention clearer and more comprehensible.
- In the following description, numerous specific details are set forth in order to provide a thorough understanding of the disclosed invention. However, the disclosed invention can be implemented in many other ways than those described herein, and a person skilled in the art can make a similar promotion without departing from the spirit of the disclosed invention. Therefore, the disclosed invention is not limited by the specific embodiments disclosed below.
- In some embodiments, a broadband low-profile dual-linearly polarized antenna as shown in
FIG. 1 and FIG. 2 can include aradiating portion 1 and afeed balun 2. Theradiating portion 1 can have a rectangular plate shape, and thefeed balun 2 can be located at a center below theradiating portion 1. As shown inFIG. 1 and FIG. 2 , thefeed balun 2 can be placed on afeed circuit board 3. - The
feed balun 2 can include afirst balun 8 and asecond balun 9 that are orthogonal to each other and can be connected to a lower surface of theradiating portion 1 to feed theradiating portion 1. Two plates of thefeed balun 2 can be snapped together through a middle slot, wherein an upper end of a middle part of one of the two plates can have a short slot, and a lower end of a middle part of another of the two plates can have a long slot, thereby implementing thefeed balun 2 through a mating connection of the long slot and the short slot. - As shown in
FIG. 3 and FIG. 4 , theradiation portion 1 can include a dielectric substrate, printed foldeddipoles 7 spaced apart on an upper surface of the dielectric substrate, first coupledparasitic elements 4 on a lower surface of the dielectric substrate, and second coupledparasitic elements 5 on the upper surface of the dielectric substrate. The radiatingportion 1 can be implemented on a printed circuit board by a printing process. - The printed folded
dipoles 7 may be placed at equal or unequal intervals on the dielectric substrate. As shown inFIG. 3 , a number of the printedfolding dipoles 7 can be four, and the printedfolding dipoles 7 can be placed at equal intervals of 90 degrees. As further shown inFIG. 3 , each of the printed foldeddipoles 7 can have a respective T-shaped match and have a respective T-shaped slit inside to form a respective current path. In some embodiments, shapes of such T-shaped slits inside of the printed foldeddipoles 7 need not be totally identical. For example, in some embodiments, a top of the T-shaped slits inside of upper and lower ones of the printedfolding dipoles 7 can be narrower than a top of the T-shaped slits inside of left and right ones of the printedfolding dipoles 7. Furthermore, in some embodiments, there can be a respective space between each of adjacent ones of the printed foldeddipoles 7, and an inside of the respective space can be substantially square while an outside of the respective space can be a respective small opening. For the formation and principle of the printed foldeddipoles 7 having a T-shaped match, reference may be made to the prior art, and details are not described herein again. - Each of the printed folded
dipoles 7 can include a corresponding one of the first coupledparasitic elements 4 and a corresponding one of the second coupledparasitic elements 5 on either side, wherein the first coupledparasitic elements 4 are on the lower surface of the dielectric substrate, and the second coupledparasitic elements 5 are on the upper surface of the dielectric substrate. The first and second coupledparasitic elements - Each of the printed
folded dipoles 7 can be non-electrically connected to the corresponding one of the first and second coupledparasitic elements parasitic elements parasitic elements parasitic elements FIG. 3 and FIG. 4 act only as an example, but not a limitation. - For example, as shown in
FIG. 4 , the first coupledparasitic elements 4 can be generally shaped as "┌", "┐", "└", and "┘", and each of the first coupledparasitic elements 4 can be located between respective ones of the adjacent ones of the printed foldeddipoles 7 with a respective notch facing inward. In some embodiments, each of the first coupledparasitic elements 4 can be located inside of respective outer contours the respective ones of the adjacent ones of the printed foldeddipoles 7, and in some embodiments, each of the first coupledparasitic elements 4 can be located right below respective inner sides of the respective small opening between the respective ones of the adjacent ones of the printed foldeddipoles 7. - In some embodiments, each of the second coupled
parasitic elements 5 can include two respective rectangular strips that need not be electrically connected in substantially the shape of the Chinese character " " and can be placed adjacent to respective neighboring portions of respective outer edges the respective ones of the adjacent ones of the printed foldeddipoles 7. In some embodiments, such rectangular strips can be different sizes, and a long side can be parallel to the respective outer edges of one of the printed foldeddipoles 7. - Each of the printed folded
dipoles 7 can have acorresponding feed point 6 located therein, and thefeed balun 2 can feed each of the printed foldeddipoles 7 through thecorresponding feed point 6 in a manner of coupled feed. -
FIG. 5(a) is a side view of portions of the first andsecond baluns baluns second balun 9 can include a recess to bypass thefirst balun 8 to avoid electrical connection (or, alternatively, to form a protrusion).FIG. 5(b) and FIG. 5(c) show the portions of the first andsecond baluns FIG. 5(a) . As shown inFIG. 5(a) , FIG. (b), andFIG. 5(c) , shapes of the first andsecond baluns portion 1 at the top through a coupling manner. - The bottom of the
feed balun 2 can be connected to a feed circuit. By way of example and not limitation, the feed circuit can be implemented using a microstrip circuit. -
FIG. 6 is a view of a broadband low-profile dual-linearly polarized antenna array device in accordance with disclosed embodiments.FIG. 6 only shows two dual-linearly polarized antennas, but embodiments disclosed herein are not so limited, and such an antenna array device can include any number of dual-linearly polarized antennas as appropriate. As shown inFIG. 6 , a feed network can feed the antenna array device. The feed network can include a one-to-two power divider so as to feed each of the dual-linearly polarized antennas with equal amplitude and same phase. The feed network can have two feed ports (i.e., port A and port B shown inFIG. 6 ) for respectively exciting two polarization modes of ±45° to feed each of the dual-linearly polarized antennas through the one-to-two power divider. - The antenna array device may also include a bottom metal reflector, and the feed network may be located above the bottom metal reflector. The bottom metal reflector can be made of a metal plate, such as a copper plate, and can have a metal flange.
- In some embodiments, the antenna array device may include a radome.
- By performing a performance test on the antenna array device shown in
FIG. 6 , the following test results and conclusions can be obtained. - As shown in
FIG. 7(a) andFIG. 7(b) , when frequency is around 1.8 GHz and 2.6 GHz, standing wave ratios can be 1.7 or less, regardless of port A or port B. - As shown in
FIG. 8 , when the frequency is around 1.8 GHz and 2.6 GHz, isolation of port A and port B can be kept below -25 dB. - As shown in
FIG. 9(a), FIG. 9(b) ,FIG. 9(c), FIG. 9(d) ,FIG. 10(a), FIG. 10(b) ,FIG. 10(c), and FIG. 10(d) , for port A or port B, an influence of frequency variation on radiation directivity of the broadband low-profile dual-linearly polarized antenna is not obvious, and radiant energy is mainly concentrated in the horizontal front. As further shown inFIG. 9(a), FIG. 9(b) ,FIG. 9(c), FIG. 9(d) ,FIG. 10(a), FIG. 10(b) ,FIG. 10(c), and FIG. 10(d) , when the frequency is around 1.8 GHz and 2.6 GHz, gains of port A and port B can both be maintained above 10 dBi, and efficiencies can both be maintained above 80%. - As shown in
FIG. 11(a) and FIG. 11(b) , for port A or port B, radiation is dominated by a main polarization, and a high cross-polarization ratio is achieved. - In summary, the broadband low-profile dual-linearly polarized antenna and the antenna array device disclosed herein can effectively realize a low-profile (reducing antenna thickness of about 35 mm in conventional cross-polarized antennas to 19 mm), can implement a wide frequency band of 1700 MHz to 2700 MHz, and can achieve high gain, high efficiency, high cross-polarization ratio, and high isolation. Furthermore, the broadband low-profile dual-linearly polarized antenna and the antenna array device disclosed herein have such advantages as simple structure, neat appearance, easy engineering implementation, and suitability for mass production.
- Although this disclosure has described specific embodiments and generally associated methods, modifications and replacements of these embodiments and methods will be apparent to those skilled in the art. Therefore, the above description of exemplary embodiments does not limit or constrain this disclosure. Other variations, substitutions, and modifications are also possible without departing from the spirit and scope of the disclosure limited by the following claims.
Claims (13)
- A broadband low-profile dual-linearly polarized antenna comprising:a radiating portion, wherein the radiating portion comprises a dielectric substrate, printed folded dipoles spaced apart on an upper surface of the dielectric substrate, first coupled parasitic elements on a lower surface of the dielectric substrate, and second coupled parasitic elements on the upper surface of the dielectric substrate; anda feed balun for feeding the radiating portion,wherein each of the printed folded dipoles includes a corresponding one of the first coupled parasitic elements and a corresponding one of the second coupled parasitic elements.
- The broadband low-profile dual-linearly polarized antenna according to claim 1, wherein each of the printed folded dipoles has a respective T-shaped match.
- The broadband low-profile dual-linearly polarized antenna according to claim 1 or 2, wherein the first coupled parasitic elements are generally shaped as "┌", "┐", "└", and "┘", and wherein each of the first coupled parasitic elements is located between respective adjacent ones of the printed folded dipoles with a respective notch facing inward.
- The broadband low-profile dual-linearly polarized antenna according to claim 3, wherein each of the first coupled parasitic elements is located inside of respective outer contours of the respective adjacent ones of the printed folded dipoles.
- The broadband low-profile dual-linearly polarized antenna according to claim 2, 3 or 4, wherein each of the second coupled parasitic elements includes two respective rectangular strips in substantially the shape of the Chinese character " " and is placed adjacent to respective neighboring portions of respective outer edges of respective adjacent ones of the printed folded dipoles.
- The broadband low-profile dual-linearly polarized antenna according to any one of claims 1 to 6, wherein the feed balun feeds the radiating portion in a manner of coupled feed.
- The broadband low-profile dual-linearly polarized antenna according to any one of claims 1 to 7, wherein the printed folded dipoles are placed at equal or unequal intervals.
- The broadband low-profile dual-linearly polarized antenna according to claim 8, further comprising four of the printed folded dipoles, wherein the printed folded dipoles are placed at the equal intervals of 90 degrees.
- The broadband low-profiled dual-linearly polarized antenna according to any one of claims 1 to 9, wherein the radiating portion is rectangular.
- A broadband low-profile dual-linearly polarized antenna array device comprising:a plurality of dual-linearly polarized antennas, wherein each of the plurality of dual-linearly polarized antennas includes the broadband low-profile dual-linearly polarized antenna of any one of claims 1 to 10;a feed network comprising a power divider for feeding the plurality of dual-linearly polarized antennas in equal amplitude and in same phase, wherein the feed network has two feed ports for respectively exciting two polarization modes of ±45° to feed each of the plurality of dual-linearly polarized antenna through the power divider; anda bottom metal reflector.
- The broadband low-profile dual-linearly polarized antenna array device according to claim 11, wherein the plurality of dual-linearly polarized antennas has a number of two, and wherein the power divider is a one-to-two power divider.
- The broadband low-profile dual-linearly polarization antenna array device according to claim 11 or 12, wherein the bottom metal reflector includes a metal flange.
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CN201710804959.4A CN109473777A (en) | 2017-09-08 | 2017-09-08 | A kind of broadband low section dual-linear polarization antenna for the two-in-one platform of OneLTE |
US16/123,938 US10819042B2 (en) | 2017-09-08 | 2018-09-06 | Broadband low-profile dual-linearly polarized antenna for a OneLTE two-in-one platform |
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EP3454414B1 EP3454414B1 (en) | 2020-05-27 |
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