CN112768884B - Dual-polarized high-isolation indoor distribution antenna - Google Patents
Dual-polarized high-isolation indoor distribution antenna Download PDFInfo
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- CN112768884B CN112768884B CN202011500893.8A CN202011500893A CN112768884B CN 112768884 B CN112768884 B CN 112768884B CN 202011500893 A CN202011500893 A CN 202011500893A CN 112768884 B CN112768884 B CN 112768884B
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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
- H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/52—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- 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
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Abstract
The invention relates to a dual-polarized high-isolation indoor distributed antenna, which is characterized by comprising the following components: the vertical polarized antenna comprises two semicircular copper sheets which are perpendicular to each other and a circular copper sheet which is positioned above the semicircular copper sheets, and a feed Kong Kuidian is positioned in the center of the dielectric plate; the horizontal polarization antenna is composed of two parts which are positioned on the upper surface and the lower surface of a dielectric plate, wherein the upper surface of the dielectric plate is provided with four printed dipoles, four arc parasitic patches and four metal strips, the lower surface of the dielectric plate is provided with a one-to-four power divider, and a dumbbell-shaped structure composed of gaps and rectangular holes is arranged in the middle of the printed dipoles. The invention can cover the indoor distribution antenna applied to 3G/LTE/5G in the frequency bands of 1.71-2.69GHz and 3.3-3.6GHz simultaneously, and has the characteristics of high port isolation, low out-of-roundness and low profile.
Description
Technical Field
The invention relates to the technical field of antennas suitable for wireless broadband communication systems, in particular to a dual-polarization high-isolation indoor distributed antenna.
Background
With the opening of 5G mass-market, the use of 5G antennas has become widespread. While the frequency of the communication system is continuously evolving towards 5G, the 2G/3G/LTE frequency band still plays an important role in the evolution process of the communication technology. Indoor Internet access requires a indoor subsystem to transmit signals to a signal source and a signal sink, and besides 5G signals, signals of a 2G/3G/LTE frequency band also need to be reserved, so that development of an antenna covering the 2G/3G/LTE/5G frequency band has a good application prospect. The indoor distribution antenna needs to have an omnidirectional radiation characteristic so that each signal sink can receive a good signal, and thus the radiation of the indoor distribution antenna is required to have a good out-of-roundness on the XOY plane. The out-of-roundness is an indicator of whether an omni-directional antenna radiates with good omni-directional characteristics on the XOY plane. The lower the out-of-roundness, the better the antenna omnidirectionality, so that the research on indoor distributed antennas with good out-of-roundness performance is necessary.
In designing an indoor distributed antenna, in order to use spectrum resources to a greater extent, a dual polarization system is generally used to increase the channel capacity of the antenna. However, when a dual polarization design is employed, difficulties in isolation between polarizations are derived. The lower the isolation, the lower the degree of coupling between the two antennas, which is an important indicator for measuring the mutual coupling between the two antennas. When designing an antenna, the lower the coupling degree of the two antennas is, the better, and the industry will put design requirements that the isolation degree is lower than-28 dB. Increasing the isolation of the two antennas is a difficulty in designing indoor distributed antennas.
When the indoor distributed antenna realizes dual polarization, the dual polarization is generally completed by two omnidirectional radiation units of a vertical polarized antenna and a horizontal polarized antenna. The vertical polarization antenna can be well realized by utilizing a cone structure, and in the aspect of the horizontal polarization antenna, the realization of the 71.7% (1.7 GHz-3.6 GHz) wide bandwidth covering the 2G/3G/LTE/5G frequency band is a difficult point, and the realization of the antenna wide bandwidth is also a difficult point because annular current is constructed on a horizontal plane to realize good omnidirectional characteristics, namely, the realization of the out-of-roundness of all frequency points in the whole frequency band is less than or equal to 3 dB.
Disclosure of Invention
The invention aims to realize an indoor distributed antenna which can cover frequency bands of 1.71-2.69GHz and 3.3-3.6GHz and is applied to 2G/3G/LTE/5G. The antenna has the characteristics of high port isolation, low out-of-roundness and low profile.
In order to achieve the above object, the dual polarized high isolation indoor distribution antenna of the present invention is characterized by comprising: the vertical polarized antenna comprises two semicircular copper sheets which are perpendicular to each other and a circular copper sheet which is positioned above the semicircular copper sheets, and a feed Kong Kuidian is positioned in the center of the dielectric plate; the horizontal polarization antenna is composed of two parts which are positioned on the upper surface and the lower surface of a dielectric plate, wherein the upper surface of the dielectric plate is provided with four printed dipoles, four arc parasitic patches and four metal strips, the lower surface of the dielectric plate is provided with a one-to-four power divider, and a dumbbell-shaped structure composed of gaps and rectangular holes is arranged in the middle of the printed dipoles.
In the horizontal polarization antenna, the four printed dipoles are uniformly distributed on the upper surface of the dielectric plate with the feed hole as a center, the four arc-shaped parasitic patches are uniformly distributed on the upper surface of the dielectric plate with the feed hole as a center, each arc-shaped parasitic patch is arranged on the outer side of each printed dipole in the radial direction so as to be coupled with two arms of the printed dipole, the four metal strips are uniformly distributed on the upper surface of the dielectric plate with the feed hole as a center in a radial direction, and each metal strip is arranged between two adjacent printed dipoles.
In the vertical polarized antenna, the two semicircular copper pieces are arranged so as to be perpendicular to the dielectric plate and positioned directly above the metal strip with the feed hole as a center.
In addition, four microstrip conductors at the tail end of the power divider respectively form four U-shaped strip conductors, and the U-shaped strip conductors are arranged at positions corresponding to the rectangular holes on the upper surface of the dielectric plate so as to be coupled with the printed dipole.
In order to achieve the omnidirectional radiation characteristic of a wide bandwidth by vertical polarization of the antenna, cone shapes are generally adopted as the radiation structure. The invention combines two semicircular copper sheets and one small circular copper sheet into the radiation structure of the vertical polarized antenna, so that the coupling with the horizontal polarized antenna is reduced while the good omnidirectional characteristic is maintained, the isolation performance is improved, and the wide bandwidth can be realized. By introducing the metal strips at 45 degrees, 135 degrees, 225 degrees and 315 degrees, the grounding plate of the horizontally polarized antenna is prolonged, the current of the grounding plate of the vertically polarized antenna is effectively guided, and the impedance matching of the vertically polarized antenna is improved.
In order to achieve the omnidirectional radiation characteristic of wide bandwidth by horizontal polarization of the antenna, the antenna is usually achieved by forming a loop current by using a feed network of a power divider and concentrically placed loop dipoles. In the invention, four printed dipoles are arranged at 0 degree, 90 degree, 180 degree and 270 degree positions on the upper surface of the F4B dielectric plate by taking the X axis as a reference, a one-to-four power divider is arranged on the lower surface, and the slit of the printed dipole is coupled in a microstrip balun mode so as to effectively feed the balanced dipole. This balun structure has the effect of optimizing the horizontal polarization bandwidth. And simultaneously etching four arc parasitic patches right in front of the printed dipole. The arc parasitic patch is coupled to both arms of the printed dipole, and supplements radiation in front of the middle gap of the dipole after excitation. This can improve the impedance matching of the horizontally polarized antenna and improve the out-of-roundness of the horizontally polarized antenna radiation.
According to the invention, two semicircular copper sheets and one small circular copper sheet are combined into a radiation structure of the vertical polarized antenna, and the two semicircular copper sheets guide the current transmitted by the coaxial line on the tangential plane where 45 degrees, 135 degrees, 225 degrees and 315 degrees are positioned when the X axis is taken as a reference, so that the coupling with the horizontal polarized antenna is reduced while the good omnidirectional characteristic is maintained, and the isolation degree of the antenna is improved. Meanwhile, the semicircular design of the sheet structure can effectively prolong the electrical length and expand the low-frequency bandwidth of the vertical polarized antenna. The circular copper sheet above can fix the semicircular sheet copper sheet and improve and optimize the high-frequency performance of the vertical polarized antenna. By introducing the metal strips at 45 DEG, 135 DEG, 225 DEG and 315 DEG with the X axis as a reference to prolong the grounding plate of the horizontally polarized antenna, the current of the grounding plate of the vertically polarized antenna is effectively guided, and the impedance matching of the vertically polarized antenna is improved.
The present invention couples the slots of the printed dipole on the upper surface of the dielectric plate in the form of a microstrip balun to produce an efficient feed of the balanced dipole. This balun structure has the effect of optimizing the horizontal polarization bandwidth. And simultaneously, four arc parasitic patches are added in front of the printed dipole, so that the arc parasitic patches are coupled with two arms of the printed dipole, and radiation in front of a middle gap of the dipole is supplemented after excitation. This can improve the impedance matching of the horizontally polarized antenna and improve the out-of-roundness of the horizontally polarized antenna radiation.
Drawings
Fig. 1 is a perspective view of a dual polarized high isolation indoor distribution antenna according to the present invention, wherein (a) is an overall structure diagram, and (b) is a schematic exploded view of the structure.
Fig. 2 is a detailed structural perspective view of a vertically polarized antenna.
Fig. 3 is a detailed structural perspective view of a horizontally polarized antenna, (a) is a schematic view of the upper surface of a dielectric plate, and (b) is a schematic view of the lower surface of the dielectric plate
Fig. 4 is a graph of simulated S-parameters of a dual polarized high isolation indoor distributed antenna of the present invention.
Fig. 5 is a gain diagram of the dual polarized high isolation indoor distributed antenna of the present invention.
Fig. 6 is a schematic diagram of out-of-roundness of a dual polarized high isolation indoor distribution antenna of the present invention.
Fig. 7 is a diagram of two polarizations of a dual polarized high isolation indoor distributed antenna of the present invention.
Reference numerals:
1: vertical polarized antenna 2: horizontally polarized antenna
3: dielectric plate 11: semicircular copper sheet
12: circular copper sheet 21: printed dipole
22: metal strip 23: arc parasitic patch
24: gap 25: rectangular aperture
26: strip-shaped gap 27: power divider
Detailed Description
These embodiments are described in sufficient detail to enable those skilled in the art to practice the invention, and with reference to the accompanying drawings. It is to be understood that the various embodiments of the invention, although different from each other, are not mutually exclusive. For example, a particular shape, structure, and characteristics described herein relate to one embodiment and may be implemented as other embodiments without departing from the spirit and scope of the invention. The positions and arrangements of the individual components in the embodiments may be changed without departing from the spirit and scope of the present invention.
Fig. 1 is a perspective view of a dual polarized high isolation indoor distribution antenna according to the present invention, wherein (a) is an overall structure diagram, and (b) is a schematic exploded view of the structure. The dual-polarized high-isolation indoor distribution antenna comprises a vertical polarized antenna 1 and a horizontal polarized antenna 2. Wherein the first part of the vertically polarized antenna 1 is formed by two mutually perpendicular semicircular copper sheets 11.
Fig. 2 is a detailed construction diagram of the vertical polarized antenna 1. The semicircular copper sheet 11 can guide the current transmitted by the coaxial line on a tangential plane where 45 DEG, 135 DEG, 225 DEG and 315 DEG are located when the X axis is taken as a reference, thereby reducing the coupling with the horizontally polarized antenna 2 and improving the isolation of the two antennas. The second part of the vertically polarized antenna 1 is a circular copper sheet 12, and the circular copper sheet 12 is configured above the two semicircular copper sheets 11, so that the semicircular copper sheets 11 can be fixed, and the function of improving and optimizing the high-frequency performance of the vertically polarized antenna 1 is also achieved.
Fig. 3 is a detailed structural perspective view of the horizontally polarized antenna 2. Wherein (a) is a schematic view of the upper surface of the F4B dielectric plate, and (B) is a schematic view of the lower surface of the dielectric plate. The horizontally polarized antenna 2 is etched on the upper and lower surfaces of the dielectric plate 3. As shown in fig. 3, on the upper surface of the dielectric plate 3 with a circular structure, four printed dipoles 21 are concentrically and uniformly distributed at 0 °, 90 °, 180 °, 270 ° positions in the clockwise direction with reference to the X axis, so that the radiation arms of the printed dipoles 21 form a ring, thereby realizing an omnidirectional radiation pattern. In the middle of the printed dipole 21 is a dumbbell structure consisting of slits 24 and rectangular apertures 25 for coupling with the balun feed network. At the same time, an arc-shaped parasitic patch 23 is provided in front of each printed dipole 21, and the two arms of the printed dipole 21 are coupled so as to supplement the radiation in front of the slot 24 in the middle of the dipole. This structure can improve the impedance matching of the horizontally polarized antenna 2 and improve the out-of-roundness of the radiation of the horizontally polarized antenna 2. The metal strips 22 are respectively arranged at the positions of 45 degrees, 135 degrees, 225 degrees and 315 degrees when the X axis is taken as a reference, and the bandwidth of the vertical polarization antenna can be improved by expanding the grounding plate. The strip-shaped void 26 behind the metal strip 22 and the rectangular void 25 behind the printed dipole 21 have the effect of guiding the ground plate current.
The lower surface of the dielectric plate 3 is provided with a quarter-turn power divider 27, and the microstrip conductor at the tail end of the power divider 27 forms a U-shaped strip conductor and is arranged at a position corresponding to the rectangular aperture 25 on the upper surface of the dielectric plate 3 so as to complete coupling with the printed dipole 21. Balanced energy is transmitted to the radiating arms of the horizontally polarized antenna 2 by means of coupling, so that the currents of the radiating arms form a loop, enabling a good omnidirectional radiation pattern.
Fig. 4 is a graph of simulated S-parameters (scattering parameters) of the dual polarized high isolation indoor distributed antenna of the present invention, wherein the impedance bandwidth S22 for vertical polarization is 81.1% (1.68 GHz-3.97 GHz), the impedance bandwidth S11 for horizontal polarization is 81.3% (1.54 GHz-3.65 GHz), and the overlapping portion of the two polarized impedance bandwidths is 73.9% (1.68 GHz-3.65 GHz). The isolation of the two polarizations is less than-45 dB, with high isolation.
Fig. 5 is a gain diagram of the dual-polarized high-isolation indoor distributed antenna according to the present invention, wherein the gain of the vertically polarized antenna ranges from 1.27dBi to 5.41dBi in the effective frequency band, and the gain of the horizontally polarized antenna ranges from 1.14dBi to 2.93dBi in the effective frequency band.
Fig. 6 is a schematic diagram of out-of-roundness of a dual polarized high isolation indoor distribution antenna of the present invention, where (a) of fig. 6 shows out-of-roundness of horizontal polarization and (b) shows out-of-roundness of vertical polarization. The non-circularity of two polarizations is larger than-3 dBi, which meets the industrial design requirement.
Fig. 7 is a diagram of two polarizations of the dual polarized high isolation indoor distributed antenna of the present invention, from which it can be seen that the XOY plane thereof has good omni-directional characteristics, and the cross polarization thereof is less than-16 dB.
As described above, the present invention is not limited to the preferred embodiments, but various modifications and changes can be made by those skilled in the art without departing from the spirit and scope of the present invention, and such modifications and changes fall within the scope of the present invention and the appended claims.
Claims (2)
1. A dual polarized high isolation indoor distribution antenna is characterized by comprising:
the vertical polarized antenna comprises two semicircular copper sheets which are perpendicular to each other and a circular copper sheet which is positioned above the semicircular copper sheets, and a feed Kong Kuidian is positioned in the center of the dielectric plate;
the horizontal polarized antenna is composed of two parts which are positioned on the upper surface and the lower surface of a dielectric plate, the upper surface of the dielectric plate is provided with four printed dipoles, four arc parasitic patches and four metal strips, the lower surface of the dielectric plate is provided with a one-to-four power divider,
the middle of the printed dipole is provided with a dumbbell-shaped structure consisting of gaps and rectangular holes,
in the horizontal polarized antenna, the four printed dipoles are uniformly distributed on the upper surface of the dielectric plate with the feed hole as the center, so that the radiation arms of the four printed dipoles form a ring, the four arc parasitic patches are uniformly distributed on the upper surface of the dielectric plate with the feed hole as the center, each arc parasitic patch is configured on the radial outer side of each printed dipole to be coupled with two arms of the printed dipole, the four metal strips are uniformly distributed on the upper surface of the dielectric plate with the feed hole as the center and are configured between two adjacent printed dipoles,
in the vertical polarized antenna, the two semicircular copper sheets are arranged to be perpendicular to the dielectric plate and located right above the metal strip by taking the feed hole as the center, and the two semicircular copper sheets are arranged with the edges where the diameters are arranged upwards.
2. The dual polarized high isolation indoor distribution antenna of claim 1, wherein,
four microstrip conductors at the tail end of the power divider respectively form four U-shaped strip conductors, and the U-shaped strip conductors are arranged at positions corresponding to the rectangular holes on the upper surface of the dielectric plate so as to be coupled with the printed dipole.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011500893.8A CN112768884B (en) | 2020-12-17 | 2020-12-17 | Dual-polarized high-isolation indoor distribution antenna |
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| CN202011500893.8A CN112768884B (en) | 2020-12-17 | 2020-12-17 | Dual-polarized high-isolation indoor distribution antenna |
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| CN112768884A CN112768884A (en) | 2021-05-07 |
| CN112768884B true CN112768884B (en) | 2023-10-03 |
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| KR101985686B1 (en) * | 2018-01-19 | 2019-06-04 | 에스케이텔레콤 주식회사 | Vertical polarization antenna |
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| CN102509903A (en) * | 2011-10-30 | 2012-06-20 | 江苏安特耐科技有限公司 | Dual-polarization ceiling antenna |
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2020
- 2020-12-17 CN CN202011500893.8A patent/CN112768884B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102804501A (en) * | 2010-03-18 | 2012-11-28 | 凯瑟雷恩工厂两合公司 | Broadband omnidirectional antenna |
| CN201859942U (en) * | 2010-09-28 | 2011-06-08 | 武汉虹信通信技术有限责任公司 | Dual-polarized omnidirectional ceiling antenna |
| CN102117973A (en) * | 2010-12-30 | 2011-07-06 | 摩比天线技术（深圳）有限公司 | Dual-polarized indoor distributed antenna |
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| WO2015018312A1 (en) * | 2013-08-05 | 2015-02-12 | Jiangsu Enice Network Information Co., Ltd. | Antenna |
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