CN107978838B - Base station antenna and high-low frequency oscillator coaxial mounting platform - Google Patents
Base station antenna and high-low frequency oscillator coaxial mounting platform Download PDFInfo
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- CN107978838B CN107978838B CN201711183408.7A CN201711183408A CN107978838B CN 107978838 B CN107978838 B CN 107978838B CN 201711183408 A CN201711183408 A CN 201711183408A CN 107978838 B CN107978838 B CN 107978838B
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- frequency
- low
- mounting platform
- frequency oscillator
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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
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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
- H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
- H01Q15/14—Reflecting surfaces; Equivalent structures
Abstract
The invention provides a high-low frequency oscillator coaxial mounting platform which comprises a mounting seat and an isolation reflector plate arranged on the mounting seat, wherein the isolation reflector plate is in a cross shape and comprises a central part and extension parts extending from four directions of the periphery of the central part, the extension parts extend upwards in an inclined mode, and an included angle is formed between the plane where the extension parts are located and the plane where the central part is located. The basic shape of the coaxial mounting platform of the high-frequency and low-frequency oscillators is an upwards bent cross-shaped sheet, low-frequency cross-polarized electromagnetic waves are converted into low-frequency main polarized electromagnetic waves through the coaxial mounting platform of the high-frequency and low-frequency oscillators, and meanwhile, the high-frequency and low-frequency electromagnetic waves are isolated; the axial propagation distance of the wave beam radiated by the high-frequency oscillator after being reflected by the cross extension part tends to be consistent, so that larger gain is realized, low-frequency orthogonal mode conversion and high-frequency gain promotion are achieved, the high-frequency reflector is a high-frequency reflector, has the functions of isolating the low-frequency oscillator and improving high-frequency wave beam dispersion, and is a low-frequency polarization separation piece, and has the functions of improving low-frequency cross polarization discrimination and promoting low-frequency gain.
Description
[ technical field ] A method for producing a semiconductor device
The invention relates to the field of communication, in particular to a base station antenna for improving cross polarization and gain of coaxial installation of high and low frequency oscillators.
[ background of the invention ]
The antenna is used as a key front-end component of a wireless communication system, and the quality of the performance of the antenna plays a decisive role in the network quality of an operator. In recent years, with the rapid increase of the number of mobile users, communication systems are continuously updated and expanded, and higher requirements are put forward on the design of antennas, so that on one hand, the broadband and multi-frequency of the antennas are required to simultaneously meet the communication requirements of a plurality of systems; on the other hand, it is required to implement multi-system sharing to reduce the number of antennas, so as to reduce interference among antennas and reduce cost.
The high-low frequency oscillator is coaxially mounted, namely: the high-frequency oscillator is arranged on a specially designed high-frequency and low-frequency nested array method, the radiator is of a frame structure, and the center of the radiator is provided with a central axis of more vacated low-frequency oscillators. As shown in fig. 1, it has become a widely adopted means for reducing size and increasing gain of the current multi-frequency antenna. Fig. 1 is a schematic diagram of a coaxial array of high and low frequency elements 101 and 102 widely used in a compact base station antenna at present: the low-frequency oscillator 101 is designed into a frame structure with a hollow middle and radiating by metal strips or sheet metal frames on the periphery, and the high-frequency oscillator 102 is installed at the axial line position of the low-frequency oscillator after being lifted by the installation seat 103, so that the coaxial array is named. Although space is saved, one of the outstanding problems with coaxial arrays is the severe cross-interference between the high frequency and low frequency oscillators: on one hand, the high-frequency oscillator above the central axis changes the polarization mode of the low-frequency oscillator below the central axis, so that the phase centers of low-frequency positive polarization and negative polarization are shifted, and cross polarization component increase and gain decrease are caused; on the other hand, after the high-frequency electromagnetic waves are scattered by the low-frequency oscillators, the radiation pattern is diverged, which is shown that the half-power angle fluctuates with the frequency, the high-frequency oscillator is interfered by the surrounding scattering and resonance, the radiation pattern is seriously dispersed, the half-power angle at some frequencies is seriously larger, the gain is suddenly reduced, the beam deformation is serious, the half-power angle at other frequencies is seriously smaller, and the signal coverage requirement cannot be met.
The existing technical means can only solve the problem of cross polarization deterioration of the low-frequency oscillator or half-power angle divergence of the high-frequency oscillator, but cannot simultaneously solve the problem of mutual interference caused by coaxial installation of the high-frequency oscillator and the low-frequency oscillator. For example: to reduce the low frequency cross-polarization component and enhance the polarization isolation of the low frequency vibrator, thereby improving the cross-polarization discrimination, a polarization splitter 202 may be installed perpendicular to the central axis of the low frequency vibrator 201, as shown in fig. 2 and 3, so that the phase centers of the main polarization component and the cross-polarization component tend to coincide. The polarization spacer 202 is a cross-shaped metal sheet, the cross direction and the positive polarization direction form an angle of 45 °, a part of the cross polarization component incident on the polarization spacer is converted into a main polarization component by an induced current flowing through the center of the cross, and the other part is cancelled by the resonant electric field. To improve the polarization isolation effect, the cross-shaped sheet is cut with a plurality of notches 203 at the edges as shown in fig. 3, thereby lengthening the current path and inducing more resonance.
To reduce the scattering of high frequency electromagnetic waves on the surface of the low frequency oscillator, as shown in fig. 4, the current solution is to insert a reflection plate 302 between the high frequency oscillator 301 and the low frequency oscillator which are coaxially disposed, and to isolate the high and low frequency oscillators in the vertical direction by installing a reflector below the high frequency oscillator. Thereby reducing the scattering of high-frequency electromagnetic waves on the surface of the low-frequency oscillator.
However, the low frequency polarization splitter and the high frequency reflection plate are difficult to be effective when applied to a coaxially mounted high and low frequency oscillator due to complicated electromagnetic interaction therebetween. The two technical means of the low-frequency oscillator plus the polarized isolating sheet and the high-frequency oscillator plus the reflector are mutually conflicting: the low-frequency oscillator and the polarization isolation sheet are easy to induce high-frequency resonance, so that the high-frequency problem is worsened; and the high-frequency oscillator and the reflector can increase low-frequency scattering, so that the problem of low-frequency cross polarization is frosted on snow.
[ summary of the invention ]
The invention aims to provide a base station antenna and a high-low frequency oscillator coaxial installation platform, which can solve the problems of cross polarization deterioration of a low-frequency oscillator, half-power angle divergence of a high-frequency oscillator and mutual interference caused by coaxial installation of the high-low frequency oscillator.
In order to realize the purpose of the invention, the following technical scheme is provided:
the invention provides a high-low frequency oscillator coaxial mounting platform which comprises a mounting seat and an isolation reflector plate arranged on the mounting seat, wherein the isolation reflector plate is in a cross shape and comprises a central part and extension parts extending from four directions of the periphery of the central part, the extension parts extend upwards in an inclined mode, and an included angle is formed between the plane where the extension parts are located and the plane where the central part is located.
The basic shape of the coaxial mounting platform of the high-frequency and low-frequency oscillators is an upwards bent cross-shaped sheet, low-frequency cross-polarized electromagnetic waves are converted into low-frequency main polarized electromagnetic waves through the coaxial mounting platform of the high-frequency and low-frequency oscillators, and meanwhile, the high-frequency and low-frequency electromagnetic waves are isolated; furthermore, the axial propagation distances of the beams radiated by the high-frequency oscillator after being reflected by the cross-shaped extension part tend to be consistent, so that larger gain is realized. The high-low frequency oscillator coaxial mounting platform has the functions of low-frequency orthogonal mode conversion and high-frequency gain improvement, is a high-frequency reflector, has the functions of isolating low-frequency oscillators and improving high-frequency beam dispersion, and is a low-frequency polarization separation piece, and has the functions of improving low-frequency cross polarization discrimination and improving low-frequency gain.
Preferably, the extending direction of the extending part forms an included angle of 45 degrees with the polarization direction of the oscillator. When the electromagnetic wave radiated by the low-frequency oscillator enters the cross-shaped reflecting surface, the phase centers of the main polarization component and the cross polarization component are synchronized by the induced current flowing through the cross center, so that the low-frequency cross polarization is improved, and the gain is also improved.
Preferably, the included angle between the plane of the extension part and the plane of the central part ranges from 0 to 90 degrees.
Preferably, the extension part extends obliquely upwards, and the included angle between the plane of the extension part and the plane of the central part is 30 degrees. The angle is the optimized result of electromagnetic field simulation software, so that the reflection of high-frequency electromagnetic waves is enhanced, the scattering on the surface of a high-frequency oscillator is reduced, and the influence on low-frequency cross polarization caused by overlarge scattering cross section is avoided.
Preferably, the extension part is of a convex structure and comprises a base part directly connected with the central part and a protrusion part extending from the outer edge of the base part. On one hand, low-frequency resonance is enhanced, and on the other hand, high-frequency resonance is restrained, so that negative effects on a high-frequency oscillator are avoided.
Preferably, the central portion is square.
Preferably, the side length L of the central portion is 60mm ± 5 mm.
Preferably, the height H of the extension part extending from the central part is 18mm ± 5 mm.
Preferably, the width L1 of the protrusion is 50mm ± 5mm, and the height H1 of the protrusion extending from the base is 5mm ± 1 mm.
The invention also provides a base station antenna which comprises the high-frequency oscillator, the low-frequency oscillator and the high-low frequency oscillator coaxial mounting platform, wherein the high-low frequency oscillator and the low-frequency oscillator are coaxially arranged, the high-low frequency oscillator coaxial mounting platform is arranged in the low-frequency oscillator, and the high-frequency oscillator is arranged on the high-low frequency oscillator coaxial mounting platform.
The invention solves the serious mutual interference generated when the high-low frequency oscillator of the base station antenna is coaxially installed, is particularly suitable for the coaxial installation situation of the 698-960 MHz low-frequency four-lobe oscillator and the 1710-2690 MHz high-frequency oscillator, and has considerable value for improving the antenna gain and overcoming the cross polarization; in addition, the invention has simple structure, can be manufactured by a base sheet metal process, has low cost and is suitable for batch production.
Compared with the prior art, the invention has the following advantages:
the basic shape of the coaxial mounting platform for the high-frequency and low-frequency vibrators is an upwards bent cross-shaped sheet, and the cross-shaped extension part is bent upwards by 30 degrees, so that the influence of surface scattered current from the surrounding low-frequency vibrators is reduced; furthermore, the axial propagation distances of the beams radiated by the high-frequency oscillator after being reflected by the cross-shaped extension part tend to be consistent, so that larger gain is realized. The high-low frequency oscillator coaxial mounting platform has the functions of low-frequency orthogonal mode conversion and high-frequency gain improvement, is a high-frequency reflector, has the functions of isolating low-frequency oscillators and improving high-frequency beam dispersion, and is a low-frequency polarization separation piece, and has the functions of improving low-frequency cross polarization discrimination and improving low-frequency gain.
The invention integrates the two functions of the low-frequency electromagnetic wave polarization mode separator and the high-frequency electromagnetic wave reflector into one component for the first time, thereby not only giving full play to the functions, but also avoiding the mutual interference between the two functions and solving the difficult problem of coaxial installation of high and low frequency oscillators; the high-low frequency oscillator coaxial mounting platform is easy to manufacture, low in cost, easy to mount and suitable for batch deployment in the base station antenna.
[ description of the drawings ]
FIG. 1 is a schematic diagram of a coaxial mounting nest array of a high-frequency and low-frequency oscillator in the prior art;
FIG. 2 is a schematic diagram of a prior art low frequency oscillator with a low frequency polarization spacer;
FIG. 3 is a schematic view of the polarization direction of a prior art low frequency polarization spacer;
FIG. 4 is a schematic view of a prior art arrangement of a reflector below a high frequency vibrator;
FIG. 5 is a schematic diagram of a coaxial mounting platform for high and low frequency oscillators of the present invention applied to a base station antenna;
FIG. 6 is a schematic structural diagram of a coaxial mounting platform for high and low frequency vibrators according to the invention;
FIG. 7 is an expanded view of the reflective spacer of the coaxial mounting platform for the high and low frequency oscillators of the present invention;
fig. 8 is a side view of the reflective spacer of the coaxial mounting platform for the high and low frequency oscillators of the present invention.
[ detailed description ] embodiments
Referring to fig. 5 to 8, the base station antenna of the present invention includes a high frequency oscillator 411 and a low frequency oscillator 412 coaxially disposed on a reflection plate 500, and a high and low frequency oscillator coaxial mounting platform, where the high and low frequency oscillator coaxial mounting platform is disposed in the low frequency oscillator 412, and the high frequency oscillator 411 is disposed on the high and low frequency oscillator coaxial mounting platform.
The embodiment of the coaxial mounting platform for the high-frequency and low-frequency oscillators comprises a mounting seat 420 and an isolation reflector 430 arranged on the mounting seat, wherein the isolation reflector is in a cross shape and comprises a central part 431 and extension parts 432 extending from four directions of the periphery of the central part, the extension parts 432 extend upwards in an inclined mode, and an included angle exists between the plane where the extension parts 432 are located and the plane where the central part 431 is located.
The extending direction of the extending part 432 forms an included angle of 45 degrees with the polarization direction of the oscillator. When the electromagnetic wave radiated by the low-frequency oscillator 412 is incident on the cross reflecting surface, the phase centers of the main polarization and the cross polarization component are synchronized by the induced current flowing through the cross center, so that the low-frequency cross polarization is improved, and the gain is also improved.
The extension part 432 extends obliquely upwards, and the included angle between the plane of the extension part 432 and the plane of the central part 431 ranges from 0 to 90 degrees. In this embodiment, the central portion 431 is square, the side length L of the central portion 431, the height H of the extending portion 432 extending from the central portion, and the extending portion 432 is in a convex structure, and includes a base portion 433 connected to the central portion 431 and a protruding portion 434 extending from the outer edge of the base portion 433, so that on one hand, low-frequency resonance is enhanced, and on the other hand, occurrence of high-frequency resonance is suppressed, thereby avoiding negative effects on a high-frequency oscillator. The width L1 of the tab 434, and the height H1 that the tab 434 extends from the base 433.
For the most common coaxial array application of 690-960 MHz low-frequency oscillators 412 and 1710-2690 MHz high-frequency oscillators 411, the parameter values in the figure are as follows: l60 mm, H18 mm, L1 50mm, H1 5 mm. The upward bending angle of the extension part 432 of the cross-shaped isolation reflection sheet 430 is 30 degrees, and the angle is the result of optimization through electromagnetic field simulation software, so that the reflection of high-frequency electromagnetic waves is enhanced, the scattering on the surface of a high-frequency oscillator is reduced, and the influence on low-frequency cross polarization caused by overlarge scattering cross section is avoided. Furthermore, the axial propagation distance of the beams radiated by the high-frequency oscillator after being reflected by the extension part tends to be consistent, so that larger gain is realized.
The invention discloses a high-low frequency oscillator coaxial mounting platform with low-frequency orthogonal mode conversion and high-frequency gain improvement.
The basic shape is an upward bent cross-shaped sheet, the extending parts respectively point to the 0-degree and 90-degree directions of the horizontal plane, and the included angle between the extending parts and the polarization direction of the oscillator is 45 degrees. When the electromagnetic wave radiated by the low-frequency oscillator enters the reflecting surface of the extension part, the phase centers of the main polarization component and the cross polarization component are synchronized by the induced current flowing through the cross center, so that the low-frequency cross polarization is improved, and the gain is also improved.
The present invention retains the basic shape of the cross to still support polarization mode conversion, but eliminates the slot and replaces it with an edge extension, which has the benefits of: on one hand, low-frequency resonance is enhanced, and on the other hand, high-frequency resonance is restrained, so that negative effects on a high-frequency oscillator are avoided.
The invention solves the serious mutual interference generated when the high-low frequency oscillator of the base station antenna is coaxially installed, is particularly suitable for the coaxial installation situation of the 698-960 MHz low-frequency four-lobe oscillator and the 1710-2690 MHz high-frequency oscillator, and has considerable value for improving the antenna gain and overcoming the cross polarization; in addition, the invention has simple structure, can be manufactured by a base sheet metal process, has low cost and is suitable for batch production.
The central part of the isolation reflector plate can also be in other shapes, such as a rectangle or a polygon, and the basic appearance of the isolation reflector plate is that an extension part which is bent upwards is arranged on the periphery of the central part. Any modifications made on this basis shall be deemed to be covered by the present patent.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited thereto, and any equivalent changes based on the technical solutions of the present invention are within the protection scope of the present invention.
Claims (10)
1. The utility model provides a coaxial mounting platform of high low frequency oscillator which characterized in that, it includes the mount pad to and set up the isolation reflector plate on the mount pad, it is the cross to keep apart the reflector plate, it includes the central part, and by the extension that four directions of central part periphery extend, the extension upwards extends to one side, and there is the contained angle that is not 0 between its place plane and the central part place plane.
2. The coaxial high and low frequency oscillator mounting platform of claim 1 wherein the extension direction of the extension portion forms an angle of 45 ° with the oscillator polarization direction.
3. The coaxial mounting platform for the high-frequency and low-frequency oscillators of claim 1, wherein the included angle between the plane of the extension part and the plane of the central part ranges from 0 ° to 90 °.
4. The coaxial high and low frequency oscillator mounting platform of claim 3 wherein the angle between the plane of the extension portion and the plane of the central portion is 30 °.
5. The high and low frequency oscillator coaxial mounting platform of claim 1, wherein the extension portion is in a zigzag configuration comprising a base portion directly connected to the central portion and a protrusion extending from an outer edge of the base portion.
6. A high and low frequency vibrator coaxial mounting platform according to claim 3, wherein said center portion is square.
7. The coaxial mounting platform for the high-frequency and low-frequency oscillators of claim 1, wherein the side length L of the central part is 60mm +/-5 mm.
8. The coaxial high and low frequency oscillator mounting platform of claim 7, wherein the height H of the extension portion extending from the central portion is 18mm plus or minus 5 mm.
9. The coaxial high and low frequency oscillator mounting platform of claim 5, wherein the width L1 of the protrusion is 50mm ± 5mm, and the height H1 of the protrusion extending from the base is 5mm ± 1 mm.
10. A base station antenna is characterized by comprising a high-frequency oscillator and a low-frequency oscillator which are coaxially arranged, and a high-frequency and low-frequency oscillator coaxial mounting platform according to any one of claims 1 to 9, wherein the high-frequency and low-frequency oscillator coaxial mounting platform is arranged in the low-frequency oscillator, and the high-frequency oscillator is arranged on the high-frequency and low-frequency oscillator coaxial mounting platform.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711183408.7A CN107978838B (en) | 2017-11-23 | 2017-11-23 | Base station antenna and high-low frequency oscillator coaxial mounting platform |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711183408.7A CN107978838B (en) | 2017-11-23 | 2017-11-23 | Base station antenna and high-low frequency oscillator coaxial mounting platform |
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| Publication Number | Publication Date |
|---|---|
| CN107978838A CN107978838A (en) | 2018-05-01 |
| CN107978838B true CN107978838B (en) | 2020-02-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201711183408.7A Active CN107978838B (en) | 2017-11-23 | 2017-11-23 | Base station antenna and high-low frequency oscillator coaxial mounting platform |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6028563A (en) * | 1997-07-03 | 2000-02-22 | Alcatel | Dual polarized cross bow tie dipole antenna having integrated airline feed |
| CN201278368Y (en) * | 2008-07-23 | 2009-07-22 | 摩比天线技术（深圳）有限公司 | Wide band coaxial bi-frequency bi-polarized electric tuning antenna |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005318438A (en) * | 2004-04-30 | 2005-11-10 | Harada Ind Co Ltd | Antenna device |
| CN201430217Y (en) * | 2009-05-16 | 2010-03-24 | 广东通宇通讯设备有限公司 | Coaxial dual-frequency bipolarization base station antenna |
| CN105609921A (en) * | 2015-11-17 | 2016-05-25 | 西安电子科技大学 | Small high and low frequency coaxial dual-polarized base station antenna unit |
-
2017
- 2017-11-23 CN CN201711183408.7A patent/CN107978838B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6028563A (en) * | 1997-07-03 | 2000-02-22 | Alcatel | Dual polarized cross bow tie dipole antenna having integrated airline feed |
| CN201278368Y (en) * | 2008-07-23 | 2009-07-22 | 摩比天线技术（深圳）有限公司 | Wide band coaxial bi-frequency bi-polarized electric tuning antenna |
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| CN107978838A (en) | 2018-05-01 |
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