CN106602223B - Low-frequency radiation unit - Google Patents
Low-frequency radiation unit Download PDFInfo
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- CN106602223B CN106602223B CN201611164995.0A CN201611164995A CN106602223B CN 106602223 B CN106602223 B CN 106602223B CN 201611164995 A CN201611164995 A CN 201611164995A CN 106602223 B CN106602223 B CN 106602223B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
- H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
- H01Q1/241—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
- H01Q1/246—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for base stations
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—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
- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Variable-Direction Aerials And Aerial Arrays (AREA)
Abstract
The invention discloses a low-frequency radiation unit, which comprises two pairs of identical bent symmetrical arrays, a base and two pairs of identical symmetrical balun arranged on the base, wherein the two pairs of symmetrical balun are arranged on the base; the two pairs of symmetrical array elements enclose a square caliber, the two array elements in each pair of symmetrical array elements and the two balun elements in each pair of symmetrical balun elements are corresponding to each other in a diagonal line of the square caliber, each array element comprises two identical array arm, the included angle of the two array arm is 90 degrees, each array arm comprises a first radiating arm section and a second radiating arm section which are connected in a collinear manner, each array arm extends in the vertical direction to form a vertical surface, the inner side of the vertical surface of each array arm is provided with a metal semi-cylinder in a protruding mode, each balun comprises two symmetrical arms side by side, each balun arm comprises an inclined section and a top vertical section, the inclined section is connected with a base, and the top vertical section is connected with the first radiating arm section. The coaxial dual-frequency broadband antenna array can realize smaller caliber and wider working bandwidth, thereby being beneficial to realizing the coaxial dual-frequency broadband antenna array.
Description
Technical Field
The invention relates to the technical field of mobile communication, in particular to a low-frequency radiation unit.
Background
The mobile communications industry has experienced rapid growth over the past decades, from early 1G to current 4G, from analog to digital communications, from narrowband to broadband communications, and from low capacity to high capacity. In this broadband high-speed user experience, the base station antenna plays a vital role. The antenna is a transducer for guiding traveling waves in a transmission line and electromagnetic waves in free space, and plays an important role in mobile communication. The environment in modern communication system is complex and changeable, and has great interference factor, and the dual polarized base station antenna can overcome multipath fading and increase channel capacity. The modern mobile communication system is
Second generation, third generation and fourth generation mobile communication coexist. This requires that the base station antenna be capable of broadband, multi-frequency coverage. Not only saving site space, but also reducing cost. However, coexistence of multiple mobile communication systems brings about mutual coupling of antennas in different frequency bands, which challenges miniaturization of high-frequency and low-frequency antenna units.
In the prior art, the aperture of low-frequency radiation is usually larger, and a plurality of difficulties exist when the high-frequency radiation unit and the low-frequency radiation unit are utilized to realize coaxial nested array antennas, and even the front projection of the low-frequency radiation unit can cover the high-frequency array, so that the mutual coupling between the high-frequency radiation unit and the low-frequency radiation unit is greatly increased. The radiation characteristics of the high frequency radiation unit are affected. Making implementation of the array antenna more difficult.
The prior art is investigated and known, and the specific steps are as follows:
1. patent publication No.: US6333720B1, kathrein corporation of germany, proposes a multi-frequency antenna array in which four symmetric array elements are enclosed into a diamond-shaped structure to realize high-low frequency nesting. This has a guiding effect on the design of the multi-frequency nested antenna, but the size of the low-frequency array is larger in doing so, so that the practical application requirements of the modern mobile communication system cannot be met.
2. Patent publication No.: CN 101425626a, patent name: broadband annular dual-polarized radiating element and linear array antenna, patentees: beijing communication System (China) Limited. The caliber of the matrix is a prototype, and compared with the caliber of a diamond, the caliber of the matrix has certain miniaturization to a certain extent.
Disclosure of Invention
The invention aims to solve the problems that the caliber of the existing low-frequency radiating element is large, so that the dual-frequency antenna array working at 698-960MHz and 1710-2690MHz is difficult to realize, and provides a low-frequency radiating element with small caliber. The small-caliber low-frequency radiating element can be used for a 698-960MHz and 1710-2690MHz dual-frequency antenna array.
In order to achieve the above purpose, the technical scheme provided by the invention is as follows: a low-frequency radiation unit comprises two pairs of identical bent symmetrical arrays, a base and two pairs of identical symmetrical balun arranged on the base; the two pairs of symmetrical array elements enclose a square caliber, the two array elements in each pair of symmetrical array elements and the two balun elements in each pair of symmetrical balun elements are corresponding to each other in a diagonal line of the square caliber, each array element comprises two identical array element arms, the included angle of the two array element arms is 90 degrees, each array element arm comprises a first radiation arm section and a second radiation arm section, the first radiation arm section and the second radiation arm section of each array element arm are connected in a collinear manner, each array element arm adopts a step gradual change structure, the first radiation arm section is of a gradual change structure which is uniformly enlarged, and the second radiation arm section is of a non-gradual change structure, namely a uniform structure; each array arm extends to form a vertical surface in the vertical direction, a metal semi-cylinder protrudes from the inner side of the vertical surface of each array arm and is used for increasing a surface current path, all the array arms form the caliber of a square corner cut, and the four corners are top vertical sections of the balun; each balun comprises two arms which are symmetrical side by side, each balun arm consists of an inclined section and a top vertical section, the inclined section is connected with the base and has an included angle, the top vertical section is connected with a first radiation arm section, the two top vertical sections of each balun are respectively connected with the first radiation arm sections of the two array arms in one array, one top vertical section in each balun is provided with a through hole for a coaxial feed cable to pass through, and the other top vertical section protrudes upwards to form a metal column for connecting with an inner core of the coaxial feed cable through a feed sheet.
The back of each balun arm is an arc-shaped groove used for fixing the wiring of the coaxial feed cable.
The base is a square base or an annular base with the outer ring chamfer inner ring angle supplementing.
The sum of the lengths of the first radiating arm section and the second radiating arm section is smaller than 0.18 times wavelength of the working center frequency of the radiating unit.
The caliber of the low-frequency radiation unit is smaller than 0.45 times of the wavelength of the working center frequency of the low-frequency radiation unit.
The included angle between the first radiation arm section and the vertical section of the top end of the adjacent balun is 135 degrees.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. the linear symmetrical array arm is bent for 45 degrees, so that the space is fully and reasonably utilized, and the miniaturization of the first step is realized.
2. According to the invention, the wide array arm extends to the vertical direction, so that the axial space is fully utilized, and the caliber of an array is indirectly reduced.
3. The miniaturization of the symmetrical array is realized by combining the array arm with the step gradient structure and the wide array arm, so that the miniaturization of the low-frequency array is further realized.
4. The projections, namely the metal semi-cylinders, are added on the array arms, so that the current path is increased, and the miniaturization is further realized.
5. The caliber of a common radiating element is generally larger, and the radiating characteristic can be influenced due to the mutual coupling action with a high-frequency radiating element when the common radiating element is used for designing a multi-frequency antenna array. The low-frequency radiating element provided by the invention realizes smaller caliber and wider working bandwidth, thereby being beneficial to realizing a coaxial double-frequency broadband antenna array.
Drawings
Fig. 1 is a perspective view of a low frequency radiating element of the present invention in embodiment 1.
Fig. 2 is a top view of the low frequency radiating element of the present invention in embodiment 1.
Fig. 3 is a voltage standing wave ratio VSWR simulation curve of the low frequency radiating element of the present invention in embodiment 1 operating in the 670MHz-960MHz frequency band.
FIG. 4 is a simulation plot of the isolation of the inventive low frequency radiating element of example 1 operating in the 670MHz-960MHz band.
Fig. 5 is a top view of the low frequency radiating element of embodiment 2 for designing a dual frequency antenna array.
Fig. 6 is a perspective view of a low-frequency dual polarized base station antenna in embodiment 3.
Fig. 7 is a top view of a low frequency dual polarized base station antenna in embodiment 3.
Detailed Description
The invention will be further illustrated with reference to specific examples.
Example 1
The square caliber array surrounded by the array arms is realized, and the caliber of the array is mainly determined by the length of the array arms. The purpose of the method is to reduce the caliber of the array, namely to realize miniaturization of the array arm under the condition that the working frequency band is unchanged, firstly, think of the array arm is wide, secondly, the array arm with the step gradual change structure is used, and thirdly, the array arm extends to the vertical direction, so that the caliber of the array cannot be increased, miniaturization can be realized, and meanwhile, the internal caliber space of the array is also increased. In addition, a protrusion or a groove is added on the surface of the array arm so as to increase a current path, thereby further realizing miniaturization.
As shown in fig. 1, the low-frequency radiating unit provided in this embodiment includes two pairs of identical bent symmetrical arrays, a square base 4 with an outer ring having a chamfer and an inner ring having a chamfer, and two pairs of identical balun elements mounted on the square base 4; the two pairs of symmetrical array elements enclose a square caliber, the two array elements in each pair of symmetrical array elements and the two balun elements in each pair of symmetrical balun elements are corresponding with the diagonal line of the square caliber, each array element comprises two identical array arm, the included angle of the two array arm is 90 degrees, and each array arm comprises a first radiation arm section 21 and a second radiation arm section 22. The first radiating arm section 21 and the second radiating arm section 22 of each array arm are connected in line. Each array arm adopts a step gradual change structure, wherein the first radiation arm section 21 is of a gradual change structure which is uniformly enlarged, and the second radiation arm section 22 is of a non-gradual change structure, namely a uniform structure; each array arm extends in the vertical direction to form a vertical surface, a metal semi-cylinder 23 protrudes from the inner side of the vertical surface of each array arm and is used for increasing a surface current path, all the array arms form the caliber of a square corner cut, and four corners are top vertical sections 1 of the balun. Each balun comprises two arms which are symmetrical side by side, each balun comprises an inclined section 3 and a vertical section 1 at the top end, the inclined section 3 is connected with a square base 4 and forms an included angle, the vertical section 1 at the top end is connected with a first radiating arm section 21, the two vertical sections 1 at the top end of each balun are respectively connected with the first radiating arm sections 21 of two array arms in one array, namely, one vertical section 1 at the top end is connected with the first radiating arm section 21 of one array arm, the included angle between the first radiating arm section 21 and the vertical section 1 at the top end is 135 degrees, one vertical section 1 at the top end in each balun is provided with a through hole 6 for a coaxial feed cable to pass through, and the other vertical section 1 at the top end is upwards protruded with a small metal column 5 for connecting with an inner core of the coaxial feed cable through a feed piece. The back of each balun arm is formed with an arcuate recess 2 for securing a feed coaxial cable trace. The inclined section 3 of the balun used in this embodiment is rectilinear, but may of course be circular or stepwise rectilinear. The base 4 of the embodiment is square annular with complementary peripheral chamfer inner frames, and of course, an annular base can also be selected.
As shown in fig. 2, the corresponding symmetric arrays 10 and 12 of the square aperture diagonal are co-polarized, achieving-45 polarization, and the two symmetric arrays are fed through a one-to-two coaxial power divider. The other pair of symmetrical arrays 11 and 13 are co-polarized, achieving a +45° polarization, the two symmetrical arrays being fed by another one-to-two coaxial power divider, the coaxial line being routed through the slot 2 in the back of the balun through the via 6 in the top vertical section 1 of the balun. The sum of the lengths of the first radiating arm section 21 and the second radiating arm section 22 of each array arm is smaller than 0.18 times wavelength of the working center frequency of the low-frequency radiating unit 9, and the caliber of the low-frequency radiating unit 9 is smaller than 0.45 times wavelength of the working center frequency of the low-frequency radiating unit, so that the design difficulty of the 698-960MHz and 1710-2690MHz dual-frequency antenna can be overcome. The structures of the first radiating arm section 21 and the second radiating arm section 22 are not limited thereto, and may be a multi-step uniform or non-uniform gradient structure and a structure in which nonlinear array arms are combined with each other.
FIG. 3 is a voltage standing wave ratio VSWR simulation curve of the low frequency radiation unit of the present invention operating in 670MHz-960MHz frequency band, with two polarized ports VSWR <1.5 in the operating frequency band. FIG. 4 is a simulation plot of the isolation of a low frequency radiating element of the present invention operating in the 670MHz-960MHz band, as seen by in-band isolation greater than 29dB.
Example 2
As shown in fig. 5, the basic dual-band antenna array structure design scheme of the present embodiment includes two low-frequency radiating elements (the low-frequency radiating element structure of embodiment 1 is adopted) working at 698-960MHz, four high-frequency radiating elements 7 working at 1710-2690MHz, and a reflecting plate 8.
Example 3
As shown in fig. 6 and 7, the dual polarized base station antenna of the present embodiment has the following main features: the small caliber, array arm 14 and balun-connected arms extend obliquely downward, the remainder being the same as in example 1. Of course, segmented long and short array arms may also be used.
The above embodiments are only preferred embodiments of the present invention, and are not intended to limit the scope of the present invention, so variations in shape and principles of the present invention should be covered.
Claims (3)
1. A low frequency radiating element, characterized by: the device comprises two pairs of identical bent symmetrical arrays, a base and two pairs of identical symmetrical balun arranged on the base; the two pairs of symmetrical array elements enclose a square caliber, the two array elements in each pair of symmetrical array elements and the two balun elements in each pair of symmetrical balun elements are corresponding to each other in a diagonal line of the square caliber, each array element comprises two identical array element arms, the included angle of the two array element arms is 90 degrees, each array element arm comprises a first radiation arm section and a second radiation arm section, the first radiation arm section and the second radiation arm section of each array element arm are connected in a collinear manner, each array element arm adopts a step gradual change structure, the first radiation arm section is of a gradual change structure which is uniformly enlarged, and the second radiation arm section is of a non-gradual change structure, namely a uniform structure; each array arm extends to form a vertical surface in the vertical direction, a metal semi-cylinder protrudes from the inner side of the vertical surface of each array arm and is used for increasing a surface current path, all the array arms form the caliber of a square corner cut, and the four corners are top vertical sections of the balun; each balun comprises two arms which are symmetrical side by side, each balun arm consists of an inclined section and a top vertical section, the inclined section is connected with the base and has an included angle, the top vertical section is connected with a first radiation arm section, the two top vertical sections of each balun are respectively connected with the first radiation arm sections of the two array arms in one array, one top vertical section in each balun is provided with a via hole for a coaxial feed cable to pass through, and the other top vertical section protrudes upwards to form a metal column for connecting with an inner core of the coaxial feed cable through a feed sheet;
the sum of the lengths of the first radiating arm section and the second radiating arm section is smaller than 0.18 times of wavelength of the working center frequency of the radiating unit;
the caliber of the low-frequency radiation unit is smaller than 0.45 times of the wavelength of the working center frequency of the low-frequency radiation unit;
the included angle between the first radiation arm section and the vertical section of the top end of the adjacent balun is 135 degrees.
2. A low frequency radiating element according to claim 1, characterized in that: the back of each balun arm is an arc-shaped groove used for fixing the wiring of the coaxial feed cable.
3. A low frequency radiating element according to claim 1, characterized in that: the base is a square base or an annular base with the outer ring chamfer inner ring angle supplementing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611164995.0A CN106602223B (en) | 2016-12-16 | 2016-12-16 | Low-frequency radiation unit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611164995.0A CN106602223B (en) | 2016-12-16 | 2016-12-16 | Low-frequency radiation unit |
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| CN106602223A CN106602223A (en) | 2017-04-26 |
| CN106602223B true CN106602223B (en) | 2023-05-02 |
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| CN201611164995.0A Active CN106602223B (en) | 2016-12-16 | 2016-12-16 | Low-frequency radiation unit |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108110409A (en) * | 2018-01-30 | 2018-06-01 | 京信通信系统（中国）有限公司 | Broadband dual polarized antenna and its radiation appliance |
| CN108461904A (en) * | 2018-03-13 | 2018-08-28 | 江苏捷士通射频系统有限公司 | Ultra-wide-band emission unit applied to low-frequency range antenna |
| CN110416704B (en) * | 2018-04-26 | 2023-07-25 | 普罗斯通信技术（苏州）有限公司 | Antenna radiating unit and broadband antenna |
| CN110994179B (en) * | 2019-09-30 | 2021-08-20 | 京信通信技术(广州)有限公司 | Feed assembly and radiation unit |
| CN112072281A (en) * | 2020-07-17 | 2020-12-11 | 中天通信技术有限公司 | Antenna radiation unit and broadband base station antenna |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102117967A (en) * | 2009-12-30 | 2011-07-06 | 广东通宇通讯股份有限公司 | Broadband dual-polarized antenna radiation unit and antenna |
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- 2016-12-16 CN CN201611164995.0A patent/CN106602223B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102117967A (en) * | 2009-12-30 | 2011-07-06 | 广东通宇通讯股份有限公司 | Broadband dual-polarized antenna radiation unit and antenna |
Non-Patent Citations (1)
| Title |
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| 侯荣晖 ; 薛锋章 ; .具有紧凑型结构的超宽带双极化基站天线.重庆邮电大学学报(自然科学版).2015,(第03期),全文. * |
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| CN106602223A (en) | 2017-04-26 |
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