阅读说明：本技术 一种新型的宽频带磁偶极子天线 (Novel broadband magnetic dipole antenna ) 是由 李蕊 刘慧� 徐乐 杨晓宁 杨勇 毕研强 于 2020-07-23 设计创作，主要内容包括：本发明提供了一种新型的宽频带磁偶极子天线,包括接地层、一对金属贴片和弯折馈电线片,所述接地层为正方形片,两片所述金属贴片呈直角金属片状且镜像垂直于接地层设置在接地层上,两个金属贴片之间设置弯折馈电线片,两个金属贴片上对称设置有横向弯折凹陷部,金属贴片上水平均匀布设有三个矩形谐振窗口,弯折馈电线片与金属贴片等高,弯折馈电线片底部与同轴线内芯连接,弯折馈电线片上依次设置有第一弯折部、第二弯折部、第三弯折部和第四弯折部。本发明结构简单、易于生产,性能提升明显,阻抗带宽显著增加,并且在工作频带内具有良好的阻抗匹配特性,具有较低的后向辐射,极化纯度较高,增益稳定,在整个工作频带内的平均增益高。(The invention provides a novel broadband magnetic dipole antenna which comprises a ground layer, a pair of metal patches and a bent power supply line sheet, wherein the ground layer is a square sheet, the two metal patches are right-angle metal sheets, mirror images are perpendicular to the ground layer and are arranged on the ground layer, the bent power supply line sheet is arranged between the two metal patches, transverse bent depressed parts are symmetrically arranged on the two metal patches, three rectangular resonance windows are uniformly distributed on the metal patches in the horizontal direction, the bent power supply line sheet is equal in height to the metal patches, the bottom of the bent power supply line sheet is connected with an inner core of a coaxial line, and a first bent part, a second bent part, a third bent part and a fourth bent part are sequentially arranged on the bent power. The invention has the advantages of simple structure, easy production, obvious performance improvement, obvious increase of impedance bandwidth, good impedance matching characteristic in a working frequency band, lower backward radiation, higher polarization purity, stable gain and high average gain in the whole working frequency band.)

1. The novel broadband magnetic dipole antenna is characterized by comprising a ground layer (1), a pair of metal patches (2) and a bent feeder line sheet (3), wherein the ground layer (1) is a square metal sheet, the metal patches (2) are integrally in a right-angle metal sheet shape, one ends of the metal patches (2) are perpendicular to the ground layer (1), the two metal patches (2) are arranged on the ground layer (1) in a mirror symmetry manner, transverse bent concave parts (5) are arranged at opposite positions on one sides, perpendicular to the ground layer (1), of the two metal patches (2), and three rectangular resonance windows (6) are uniformly distributed on the metal patches (2) along the length direction of the metal patches (2); the bending power supply line piece (3) is perpendicular to the ground layer (1) and arranged between the two metal patches (2), the bending power supply line piece (3) is equal in height to the metal patches (2), one end, close to the ground layer (1), of the bending power supply line piece (3) is connected with an inner core of the coaxial line (4), a first bending portion (7), a second bending portion (8), a third bending portion (9) and a fourth bending portion (10) are sequentially arranged on the bending power supply line piece (3), and two pairwise perpendicular four bending portions form two rectangular step platforms on the bending power supply line piece (3).

2. A novel broadband magnetic dipole antenna according to claim 1, characterized in that said metal patches (2) have a length of 60mm, a width of 30mm and a height of 30mm, and the distance between two metal patches (2) is 13 mm.

3. The novel broadband magnetic dipole antenna as claimed in claim 1, wherein the side length of said ground plane (1) is 150mm, the lower end of said rectangular resonant window (6) is 11.5mm from said ground plane (1), the distance between the outer side of said rectangular resonant window (6) and the edge of said metal patch (2) is 6.5mm, the length and width of said rectangular resonant window (6) is 7 x 6mm, and the distance between adjacent said rectangular resonant windows (6) is 13 mm.

4. The novel broadband magnetic dipole antenna according to claim 1, wherein the width of the bent power feeding sheet (3) is 4.91mm, the height of the bent power feeding sheet is 30mm, the length of the first bent portion (7) is 9.73mm, the length of the second bent portion (8) is 10mm, the length of the third bent portion (9) is 1.08mm, the length of the fourth bent portion (10) is 1.72mm, the distance between one side of the bent power feeding sheet (3) connecting the coaxial cable (4) and the metal patch (2) is 1mm, the transverse bending recess (5) is a rectangular groove, the lower end of the transverse bending recess (5) is 26.4mm from the ground layer (1), and the length, width and height of the transverse bending recess (5) are 60 x 11 x 1.8 mm.

5. The novel broadband magnetic dipole antenna according to claim 1, wherein the impedance of the coaxial line (4) is 50 Ω, the inner core of the coaxial line (4) is made of chlorinated polyethylene and has a radius of 0.125 mm; the filling radius of the coaxial line (4) is 0.425mm, the filling material is Teflon, and the grounding layer (1), the metal patch (2) and the bent feeder sheet (3) are all made of copper.

Technical Field

The invention belongs to the technical field of antenna design and manufacture, and particularly relates to a novel broadband magnetic dipole antenna.

Background

In recent years, mobile communication has undergone four generations of development: first generation AMPS, TACS, NMTS, and other analog communication systems; second generation digital communication systems such as GSM, DCS, narrow-band CDMA and the like; the third generation TD-SCDMA, WCDMA, CDMA2000 and other mobile communication systems; a fourth generation TDD-LTE, FDD-LTE mobile communication system. Now, with the calibration and release of the 5G frequency by the department of industry and telecommunications, the research center of gravity of the communication technology is gradually shifting toward the development of the 5G mobile communication technology, and it is expected that a significant performance improvement can be realized on the basis of the fourth generation communication system.

With the rapid development of mobile communication technology, people's lives have changed greatly, and mobile phones have become indispensable devices in daily life. The communication operation of the mobile phone mainly depends on a base station, radio frequency signals and electromagnetic waves in free space are converted by antennas in communication equipment, and base station antennas in mobile communication are an outlet and an inlet of mobile communication user information connected with the base station equipment. The base station antenna is also a key component in the base station that determines the quality of communication. With the increase of mobile communication users and the increase of the user experience requirements on the base station service, the requirements of communication work on the base station are higher and higher, the requirements on the coverage range of the base station are increased, and the requirements on the performance index of the base station antenna are also higher and higher. Meanwhile, with the application and development of wireless communication technology, spectrum becomes a scarce resource. Many frequency bands have been developed for various wireless communication systems, television systems and surveillance systems, such as UHF/VHF television systems, cellular systems, Global Positioning System (GPS), bluetooth, Wireless Local Area Network (WLAN), Ultra Wide Band (UWB), and automotive radar, among others. Therefore, in order to meet various communication requirements and improve communication quality, on one hand, the antenna needs to have excellent performance: the impedance bandwidth is expanded as much as possible, and the advantages of low cross polarization, low backward radiation, symmetrical radiation mode, stable gain in a working frequency band and the like are required; on the other hand, the device is simpler and more convenient to install and convenient for later maintenance and the like on the premise of excellent performance. The complex antenna structure can achieve better performance, but in practical application, a large amount of manufacturing cost needs to be spent, and the workload of later maintenance is greatly increased. Therefore, the high-performance antenna unit which is low in cost, simple in structure and convenient to maintain at a later stage also has important research value.

Disclosure of Invention

The technical problem to be solved by the present invention is to provide a novel broadband magnetic dipole antenna, which has a simple and scientific structural design, a low production cost, an obvious performance improvement, an obviously increased impedance bandwidth, a good impedance matching characteristic in a working frequency band, a low backward radiation, a high polarization purity, a stable gain, a high average gain in the whole working frequency band, and is suitable for popularization and use.

In order to solve the technical problems, the invention adopts the technical scheme that: the novel broadband magnetic dipole antenna is characterized by comprising a ground layer, a pair of metal patches and a bent feeder line sheet, wherein the ground layer is a square metal sheet, the whole metal patches are in a right-angle metal sheet shape, one ends of the metal patches are perpendicular to the ground layer, the two metal patches are arranged on the ground layer in a mirror symmetry manner, transverse bent concave parts are arranged at opposite positions on one sides of the two metal patches perpendicular to the ground layer, and three rectangular resonance windows are uniformly distributed on the metal patches along the length direction of the metal patches; the bending power feeding sheet is perpendicular to the ground layer and arranged between the two metal patches, the bending power feeding sheet is equal to the metal patches in height, one end, close to the ground layer, of the bending power feeding sheet is connected with the inner core of the coaxial line, a first bending portion, a second bending portion, a third bending portion and a fourth bending portion are sequentially arranged on the bending power feeding sheet, and two of the four bending portions are perpendicular to the bending power feeding sheet to form two rectangular step platforms.

Preferably, the side length of the ground layer is 150mm, the lower end of the rectangular resonance window is 11.5mm away from the ground layer, the distance between the outer side edges of the rectangular resonance windows at two sides and the edge of the metal patch is 6.5mm, the length and width dimensions of the rectangular resonance windows are 7 × 6mm, and the distance between adjacent rectangular resonance windows is 13 mm.

Preferably, the metal patches have a length of 60mm, a width of 30mm, a height of 30mm, and a distance between two metal patches of 13 mm.

Preferably, the width of the bent power feeding sheet is 4.91mm, the height of the bent power feeding sheet is 30mm, the length of the first bent portion is 9.73mm, the length of the second bent portion is 10mm, the length of the third bent portion is 1.08mm, the length of the fourth bent portion is 1.72mm, the distance between one side of the bent power feeding sheet, which is connected with the coaxial line, and the metal patch is 1mm, the transverse bending depression is a rectangular groove, the lower end of the transverse bending depression is 26.4mm away from the ground layer, and the length, width and height of the transverse bending depression is 60 × 11 × 1.8 mm.

Preferably, the impedance of the coaxial line is 50 Ω, the inner core of the coaxial line is made of chlorinated polyethylene, and the radius is 0.125 mm; the filling radius of the coaxial line is 0.425mm, the filling material is Teflon, and the grounding layer, the metal patch and the bent feeder sheet are all made of copper.

Compared with the prior art, the invention has the following advantages:

1. the invention has simple and reasonable structure, low processing and manufacturing cost, convenient installation and convenient maintenance, can effectively improve the performance of the antenna on the premise of reducing the cost, obviously increases the impedance bandwidth, has good impedance matching characteristic in a working frequency band, has lower backward radiation, higher polarization purity and stable gain.

2. According to the invention, the metal patch is provided with three rectangular resonance windows, the bent feeder line is provided with four right-angle bent parts, a stable radiation pattern is arranged in the whole working frequency band, the backward radiation is low, and the polarization purity is high.

The present invention will be described in further detail with reference to the accompanying drawings and examples.

Drawings

Fig. 1 is a schematic perspective view of the present invention.

Fig. 2 is a schematic front view of the present invention.

Fig. 3 is a side view of the present invention.

Fig. 4 is a schematic top view of the present invention.

Fig. 5 is a schematic structural view of the meander feed line tab of the present invention.

FIG. 6 is a front sizing chart of the present invention.

FIG. 7 is a side dimensional annotation comparison of the present invention.

Fig. 8 is a top sizing chart of the present invention.

Fig. 9 is a S11 curve for an antenna that does not add a rectangular resonant window, a third fourth bend, and a lateral bend recess.

Fig. 10 is an antenna pattern for an antenna without the addition of a rectangular resonant window, a third fourth bend, and a transverse bend depression.

Fig. 11 is an antenna S11 curve with the addition of a third fourth bend.

Fig. 12 is an antenna pattern with the addition of a third fourth bend.

Fig. 13 is a S11 curve for an antenna with an added lateral bend depression.

Fig. 14 is a S11 curve for an antenna designed according to the present invention.

Fig. 15 is an E-plane and H-plane antenna pattern for an antenna designed according to the present invention.

Fig. 16 is a graph of the gain of an antenna designed according to the present invention.

Description of reference numerals:

1-a ground plane; 2-metal patch; 3-bending the feeder sheet;

4-coaxial line; 5, transversely bending the concave part; 6-rectangular resonance window;

7-a first bend; 8-a second bend; 9-a third bending part;

10-fourth bend.

Detailed Description

As shown in fig. 1 to 5, the invention includes a ground layer 1 placed horizontally, a pair of metal patches 2 and a bent feeder sheet 3, the ground layer 1 is a square metal sheet, the metal patches 2 are integrally in a right-angle metal sheet shape, one end of each metal patch 2 is perpendicular to the ground layer 1, so that the metal patches 2 form a horizontal section and a vertical section, the two metal patches 2 are arranged on the ground layer 1 in a mirror symmetry manner, the vertical sections of the two metal patches 2 are oppositely provided with transverse bent recessed portions 5, and three rectangular resonance windows 6 are uniformly distributed on the metal patches 2 along the horizontal length direction of the metal patches 2; the bending power feeding sheet 3 is perpendicular to the ground layer 1 and arranged between the two metal patches 2, the bending power feeding sheet 3 is equal in height to the metal patches 2, one end, close to the ground layer 1, of the bending power feeding sheet 3 is connected with an inner core of the coaxial line 4, a first bending portion 7, a second bending portion 8, a third bending portion 9 and a fourth bending portion 10 are sequentially arranged on the bending power feeding sheet 3, and two of the four bending portions are perpendicular to each other to form two rectangular step platforms on the bending power feeding sheet 3.

In this embodiment, as shown in fig. 6 to 8, the side length of the ground layer 1 is 150mm, the distance H from the lower end of the rectangular resonant window 6 to the ground layer 1 is 11.5mm, and the distance D from the outer side edges of the rectangular resonant windows 6 located at both sides to the vertical edge of the metal patch 2_e6.5mm, length and width dimension l of rectangular resonance window 6_g×w_g7 × 6mm, the distance D between adjacent rectangular resonance windows 6 is 13mm, the length L of the metal patch 2 is 60mm, the width W of the metal patch is 30mm, the height h of the metal patch is 30mm, and the distance S between two metal patches 2 is 13 mm.

In this embodiment, the width d of the bent power feeding tab 3 is 4.91mm, the height h is 30mm, the length a of the first bent portion 7 is 9.73mm, the length b of the second bent portion 8 is 10mm, the length n of the third bent portion 9 is 1.08mm, the length m of the fourth bent portion 10 is 1.72mm, the distance c between the side of the bent power feeding tab 3 connecting the coaxial wire 4 and the metal patch 2 is 1mm, and the transverse bending depressed portion is 30mm5 is a rectangular groove and the lower end of the transverse bending depressed part 5 is away from the grounding layer 1h₁26.4mm, the length of the transverse bending depressed part 5 is 60mm as the length of the metal patch 2, and the width is l_fThe height is 1.8mm, 11.

In this embodiment, the impedance of the coaxial line 4 is 50 Ω, the inner core of the coaxial line 4 is made of chlorinated polyethylene, and the radius is 0.125 mm; the filling radius of the coaxial line 4 is 0.425mm, the filling material is Teflon, and the grounding layer 1, the metal patch 2 and the bent feeder sheet 3 are all made of copper.

Comparative example 1

Compared with the antenna without the third bent part 9, the fourth bent part 10, the transverse bent recessed part 5 and the rectangular resonant window 6, the antenna of the present invention is simulated to obtain an S11 curve and an antenna directional diagram as shown in fig. 9 and fig. 10. However, the antenna has poor characteristics in the low frequency band, so that the impedance bandwidth is still not wide enough for modern wireless communication systems. As seen from the central frequency pattern of the structure, almost consistent E-plane and H-plane patterns can be obtained, but the cross polarization is large, and the backward radiation is also high.

Comparative example 2

Adding the third bent portion 9 and the fourth bent portion 10 to the comparative example 1 results in the S11 curve and the antenna pattern shown in fig. 11 and 12, and the comparative example 2 provides an antenna having improved low frequency characteristics and lower cross polarization compared to the antenna of the comparative example 1. However, the impedance matching characteristic of the antenna in the middle frequency band still can not meet the communication requirement.

Comparative example 3

The addition of the transverse bending depression part 5 on the basis of the comparative example 2 results in the curve of the antenna S11 shown in fig. 13, and the impedance matching of the antenna provided by the comparative example 3 is improved compared with the antenna of the comparative example 2 in the middle frequency band.

On the basis of comparative example 3, in order to obtain better impedance matching characteristics, a resonance window 6 is added in the vertical part of the metal patch 2, i.e. the magnetic dipole. Through multiple experimental verification and simulation design, the sizes and the structures of the three optimized design parts are reasonably combined, and finally the novel broadband magnetoelectric dipole antenna is obtained.

As shown in fig. 14 to 16, the antenna designed by the present invention realizes an impedance bandwidth of 76% (VSWR ≦ 2), and the operating frequency band covers 1.44GHz-3.19GHz, compared with the existing antenna, the antenna has a simple structure, is easy to produce, but has improved performance, the impedance bandwidth is widened by nearly one time, and has good impedance matching characteristics in the operating frequency band; a stable radiation directional diagram is arranged in the whole working frequency band, the E surface is almost consistent with the H surface directional diagram, the backward radiation is low, and the polarization purity is high; the gain is stable and the average gain over the entire operating band exceeds 8 dBi.

The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention in any way. Any simple modification, change and equivalent changes of the above embodiments according to the technical essence of the invention are still within the protection scope of the technical solution of the invention.