阅读说明：本技术 一种宽带圆极化交叉磁电偶极子天线 (broadband circularly polarized cross magnetoelectric dipole antenna ) 是由 赵刚 张福顺 杨凯文 张凡 于 2019-08-16 设计创作，主要内容包括：本发明涉及天线技术领域,具体涉及一种宽带圆极化交叉磁电偶极子天线,其特征是：至少包括：介质基板、金属地板、半椭圆形交叉偶极子贴片、寄生贴片和磁偶极子金属板,磁偶极子金属板为矩形折叠结构,介质基板和金属地板通过多个矩形折叠结构的磁偶极子金属板和同轴线连接成“工”字型结构,介质基板和金属地板相互平行,介质基板和金属地板与磁偶极子金属板垂直,介质基板和金属地板通过同轴线使其电导通连接。提供一种以应用于无线通信系统中获得了较宽的圆极化带宽和良好的辐射方向图特性,能够显著提高系统性能的一种宽带圆极化交叉磁电偶极子天线。(The invention relates to the technical field of antennas, in particular to a broadband circularly polarized crossed magnetoelectric dipole antenna which is characterized in that: at least comprises the following steps: the magnetic dipole metal plate is of a rectangular folding structure, the dielectric substrate and the metal floor are connected into an I-shaped structure through the magnetic dipole metal plates of the rectangular folding structures and a coaxial line, the dielectric substrate and the metal floor are parallel to each other, the dielectric substrate and the metal floor are perpendicular to the magnetic dipole metal plates, and the dielectric substrate and the metal floor are electrically connected through the coaxial line. The broadband circularly polarized cross magnetoelectric dipole antenna is applied to a wireless communication system, obtains a wider circularly polarized bandwidth and good radiation pattern characteristics, and can remarkably improve the system performance.)

1. A broadband circular polarization cross magnetoelectric dipole antenna is characterized in that: at least comprises the following steps: medium base plate (1), metal floor (2), half oval cross dipole paster, parasitic paster and magnetic dipole metal sheet, magnetic dipole metal sheet is rectangle beta structure, medium base plate (1) and metal floor (2) connect into "worker" style of calligraphy structure through a plurality of rectangle beta structure's magnetic dipole metal sheet and coaxial line (17), medium base plate (1) and metal floor (2) are parallel to each other, medium base plate (1) and metal floor (2) are perpendicular with magnetic dipole metal sheet, medium base plate (1) and metal floor (2) make its electric conduction connect through the coaxial line.

2. The broadband circularly polarized cross-magnetic-electric dipole antenna according to claim 1, wherein: a first semi-elliptical crossed dipole metal patch (3) and a second semi-elliptical crossed dipole metal patch (4) are distributed on the upper surface of the dielectric substrate (1); a third half-oval crossed dipole metal patch (5) and a fourth half-oval crossed dipole metal patch (6) are distributed on the lower surface of the dielectric substrate (1); the first half-elliptic crossed dipole metal patch (3), the second half-elliptic crossed dipole metal patch (4), the third half-elliptic crossed dipole metal patch (5) and the fourth half-elliptic crossed dipole metal patch (6) are distributed around the circumference at 90 degrees, and a first parasitic patch (7), a second parasitic patch (8), a third parasitic patch (9) and a fourth parasitic patch (10) are distributed in the first half-elliptic crossed dipole metal patch (3), the second half-elliptic crossed dipole metal patch (4), the third half-elliptic crossed dipole metal patch (5) and the fourth half-elliptic crossed dipole metal patch (6) at intervals; the first parasitic patch (7), the second parasitic patch (8), the third parasitic patch (9) and the fourth parasitic patch (10) are also arranged at four corners of the upper surface of the dielectric substrate (1); the first parasitic patch (7), the second parasitic patch (8), the third parasitic patch (9) and the fourth parasitic patch (10) are square.

3. the broadband circularly polarized cross-magnetic-electric dipole antenna according to claim 1, wherein: the number of the magnetic dipole metal plates is four, and the four magnetic dipole metal plates are respectively a first magnetic dipole metal plate (13), a second magnetic dipole metal plate (14), a third magnetic dipole metal plate (15) and a fourth magnetic dipole metal plate (16); the first magnetic dipole metal plate (13) and the second magnetic dipole metal plate (14) are of two identical rectangular folding structures and are arranged below the first semi-elliptical crossed dipole metal patch (3) and the second semi-elliptical crossed dipole metal patch (4); the third magnetic dipole metal plate (15) and the fourth magnetic dipole metal plate (16) are of two same rectangular folding structures and are arranged below the third semi-elliptical crossed dipole metal patch (5) and the fourth semi-elliptical crossed dipole metal patch (6); and is electrically connected with the metal floor (2), preferably, the magnetic dipole metal plate is an aluminum plate or a copper plate.

4. The broadband circularly polarized cross-magnetic-electric dipole antenna according to claim 2, wherein: the first half-elliptic crossed dipole metal patch (3) and the second half-elliptic crossed dipole metal patch (4) are connected with the second phase shift ring (12), arranged on the upper surface of the medium substrate (1) and connected with the inner core of the coaxial line (17); the third half-oval crossed dipole metal patch (5) and the fourth half-oval crossed dipole metal patch (6) are electrically connected with the first phase shift ring (11), arranged on the lower surface of the dielectric substrate (1) and electrically connected with the outer skin of the coaxial line (17); the SMP connector 18 is electrically connected to the coaxial line (17) through the metal floor (2).

5. The broadband circularly polarized cross-magnetic-electric dipole antenna according to claim 1, wherein: the length of the metal floor (2) is 80 mm, the width of the metal floor is 80 mm, and the overall height of the antenna is 26 mm; the dielectric constant of the dielectric substrate (1) is 3.5, the length of the dielectric substrate (1) is 38.2 mm, the width of the dielectric substrate is 38.2 mm, and the thickness of the dielectric substrate is 1 mm; the first semielliptical crossed dipole metal patch (3), the second semielliptical crossed dipole metal patch (4), the third semielliptical crossed dipole metal patch (5) and the fourth semielliptical crossed dipole metal patch (6) are respectively printed on the upper surface and the lower surface of the medium substrate (1), the length of a long semiaxis of the medium substrate is 11 mm, and the length of a short semiaxis of the medium substrate is 7 mm.

6. The broadband circularly polarized cross-magnetic-electric dipole antenna according to claim 2, wherein: four cross-shaped gaps in the first half-elliptical crossed dipole metal patch (3), the second half-elliptical crossed dipole metal patch (4), the third half-elliptical crossed dipole metal patch (5) and the fourth half-elliptical crossed dipole metal patch (6) are etched in the centers of the first half-elliptical crossed dipole metal patch (3), the second half-elliptical crossed dipole metal patch (4), the third half-elliptical crossed dipole metal patch (5) and the fourth half-elliptical crossed dipole metal patch (6) respectively, the length is 8 millimeters, and the width is 5 millimeters; the first parasitic patch (7), the second parasitic patch (8), the third parasitic patch (9) and the fourth parasitic patch (10) are composed of square metal patches with the length of 6 millimeters, and are printed on the upper surface of the dielectric substrate (1); the first phase shift ring (11) and the second phase shift ring (12) are concentric arcs, and have a radius of 3.7 mm and a width of 1 mm.

Technical Field

The invention relates to the technical field of antennas, in particular to a broadband circularly polarized crossed magnetoelectric dipole antenna.

Background

With the development of wireless communication systems, circularly polarized antennas are receiving more and more attention due to better polarization matching, and are widely applied to the fields of Global Positioning Systems (GPS), Radio Frequency Identification (RFID), Wireless Local Area Networks (WLAN), satellite communication and the like. At the same time, modern wireless communication transmission systems require higher and higher transmission rates and transmission bandwidths, which require antennas with wider operating bands. Therefore, the broadband and low-profile circularly polarized antenna can more easily meet the requirements of wireless communication systems.

Disclosure of Invention

The invention aims to provide a broadband circularly polarized crossed magnetoelectric dipole antenna which is applied to a wireless communication system, obtains wider circularly polarized bandwidth and good radiation pattern characteristics and can obviously improve the system performance.

To achieve the above object, the present invention provides a broadband circularly polarized cross-magnetic-electric dipole antenna, comprising: at least comprises the following steps: the magnetic dipole metal plate is of a rectangular folding structure, the dielectric substrate and the metal floor are connected into an I-shaped structure through the magnetic dipole metal plates of the rectangular folding structures and a coaxial line, the dielectric substrate and the metal floor are parallel to each other, the dielectric substrate and the metal floor are perpendicular to the magnetic dipole metal plates, and the dielectric substrate and the metal floor are electrically connected through the coaxial line.

The upper surface of the dielectric substrate is distributed with a first semi-elliptical crossed dipole metal patch and a second semi-elliptical crossed dipole metal patch; a third semi-elliptical crossed dipole metal patch and a fourth semi-elliptical crossed dipole metal patch are distributed on the lower surface of the medium substrate; the first half-elliptic crossed dipole metal patch, the second half-elliptic crossed dipole metal patch, the third half-elliptic crossed dipole metal patch and the fourth half-elliptic crossed dipole metal patch are distributed around the circumference at 90 degrees, and the first parasitic patch, the second parasitic patch, the third parasitic patch and the fourth parasitic patch are distributed in the first half-elliptic crossed dipole metal patch, the second half-elliptic crossed dipole metal patch, the third half-elliptic crossed dipole metal patch and the fourth half-elliptic crossed dipole metal patch at intervals; the first parasitic patch, the second parasitic patch, the third parasitic patch and the fourth parasitic patch are also arranged at four corners of the upper surface of the dielectric substrate; the first parasitic patch, the second parasitic patch, the third parasitic patch and the fourth parasitic patch are square.

The number of the magnetic dipole metal plates is four, and the four magnetic dipole metal plates are respectively a first magnetic dipole metal plate, a second magnetic dipole metal plate, a third magnetic dipole metal plate and a fourth magnetic dipole metal plate; the first magnetic dipole metal plate and the second magnetic dipole metal plate are of two identical rectangular folding structures and are arranged below the first semi-elliptical crossed dipole metal patch and the second semi-elliptical crossed dipole metal patch; the third magnetic dipole metal plate and the fourth magnetic dipole metal plate are of two identical rectangular folding structures and are arranged below the third semi-elliptical crossed dipole metal patch and the fourth semi-elliptical crossed dipole metal patch; and is electrically connected with the metal floor, preferably, the magnetic dipole metal plate is an aluminum plate or a copper plate.

the first half-elliptic crossed dipole metal patch and the second half-elliptic crossed dipole metal patch are connected with the second phase shifting ring, arranged on the upper surface of the medium substrate and connected with the coaxial line inner core; the third half-elliptic crossed dipole metal patch and the fourth half-elliptic crossed dipole metal patch are electrically connected with the first phase shift ring, arranged on the lower surface of the dielectric substrate and electrically connected with the outer skin of the coaxial line; the SMP connector passes through the metal floor and is electrically connected with the coaxial line.

The length of the metal floor is 80 mm, the width of the metal floor is 80 mm, and the overall height of the antenna is 26 mm; the dielectric constant of the dielectric substrate is 3.5, the length of the dielectric substrate is 38.2 mm, the width of the dielectric substrate is 38.2 mm, and the thickness of the dielectric substrate is 1 mm; the first semi-elliptical crossed dipole metal patch, the second semi-elliptical crossed dipole metal patch, the third semi-elliptical crossed dipole metal patch and the fourth semi-elliptical crossed dipole metal patch are respectively printed on the upper surface and the lower surface of the medium substrate, the length of the long semi-axis of the medium substrate is 11 mm, and the length of the short semi-axis of the medium substrate is 7 mm.

Four cross-shaped gaps in the first semi-elliptical crossed dipole metal patch, the second semi-elliptical crossed dipole metal patch, the third semi-elliptical crossed dipole metal patch and the fourth semi-elliptical crossed dipole metal patch are etched in the centers of the first semi-elliptical crossed dipole metal patch, the second semi-elliptical crossed dipole metal patch, the third semi-elliptical crossed dipole metal patch and the fourth semi-elliptical crossed dipole metal patch respectively, the length is 8 millimeters, and the width is 5 millimeters; the first parasitic patch, the second parasitic patch, the third parasitic patch and the fourth parasitic patch are composed of square metal patches with the length of 6 millimeters, and are printed on the upper surface of the dielectric substrate; the first phase shift ring and the second phase shift ring are concentric arcs with a radius of 3.7 mm and a width of 1 mm.

Compared with the prior art, the invention has the beneficial effects that:

1. The technology of loading the magnetic dipole and the parasitic patch is adopted to obviously widen the circularly polarized working bandwidth of the antenna, obtain more stable gain bandwidth, and the radiation performance of the antenna is more stable in the working frequency band.

2. The broadband directional circularly polarized antenna has the advantages of simple structure, easy processing, small volume, light weight, low cost and the like. Drawings

The invention will be further described with reference to the drawings and specific embodiments, which are illustrative of the invention and are not to be construed as limiting the invention.

Drawings

FIG. 1 is a top plan view of the present invention;

FIG. 2 is a side view of the present invention;

FIG. 3 is a bottom plan view of the base layer of the present invention;

FIG. 4 is a graph of the voltage standing wave ratio of the antenna of the present invention as a function of frequency;

FIG. 5 is a XOZ plane radiation pattern for the antenna of the present invention operating at 3.0 GHz;

FIG. 6 is a YOZ plane radiation pattern for the antenna of the present invention operating at 3.0 GHz;

FIG. 7 is an XOZ plane radiation pattern for the antenna of the present invention operating at 4.0 GHz;

FIG. 8 is a YOZ plane radiation pattern for the antenna of the present invention operating at 4.0 GHz;

FIG. 9 is an XOZ plane radiation pattern for the antenna of the present invention operating at 5.0 GHz;

FIG. 10 is a YOZ plane radiation pattern for the antenna of the present invention operating at 5.0 GHz;

FIG. 11 is a graph of the circular polarization axial ratio of the antenna of the present invention as a function of frequency;

FIG. 12 is a graph of right hand circular polarization gain versus frequency for the antenna of the present invention.

Reference numbers in the figures: 1. a dielectric substrate; 2. a metal floor; 3. a first half-elliptical crossed dipole metal patch; 4. a second semi-elliptical crossed dipole metal patch; 5. a third semi-elliptical crossed dipole metal patch; 6. a fourth semi-elliptical crossed dipole metal patch; 7. a first parasitic patch; 8. a second parasitic patch; 9. a third parasitic patch; 10. a fourth parasitic patch; 11. a first phase shift loop; 12. a second phase shift ring; 13. a first magnetic dipole metal plate; 14. a second magnetic dipole metal plate; 15. a third magnetic dipole metal plate; 16. a fourth magnetic dipole metal plate; 17. a coaxial line; 18. SMP joints.

Detailed Description

As shown in fig. 1, fig. 2 and fig. 3, a broadband circular polarization cross-magnetic-electric dipole antenna at least includes: the medium substrate 1, the metal floor 2, half oval cross dipole paster, parasitic paster and magnetic dipole metal sheet, the magnetic dipole metal sheet is rectangle beta structure, medium substrate 1 and metal floor 2 connect into "worker" style of calligraphy structure through the magnetic dipole metal sheet and the coaxial line 17 of a plurality of rectangle beta structures, medium substrate 1 and metal floor 2 are parallel to each other, medium substrate 1 and metal floor 2 are perpendicular with the magnetic dipole metal sheet, medium substrate 1 and metal floor 2 make its electric conduction connect through the coaxial line.

a first semi-elliptical crossed dipole metal patch 3 and a second semi-elliptical crossed dipole metal patch 4 are distributed on the upper surface of the dielectric substrate 1; a third semi-elliptical crossed dipole metal patch 5 and a fourth semi-elliptical crossed dipole metal patch 6 are distributed on the lower surface of the medium substrate 1; the first half-elliptic crossed dipole metal patch 3, the second half-elliptic crossed dipole metal patch 4, the third half-elliptic crossed dipole metal patch 5 and the fourth half-elliptic crossed dipole metal patch 6 are distributed around the circumference at 90 degrees, and a first parasitic patch 7, a second parasitic patch 8, a third parasitic patch 9 and a fourth parasitic patch 10 are distributed in the first half-elliptic crossed dipole metal patch 3, the second half-elliptic crossed dipole metal patch 4, the third half-elliptic crossed dipole metal patch 5 and the fourth half-elliptic crossed dipole metal patch 6 at intervals; the first parasitic patch 7, the second parasitic patch 8, the third parasitic patch 9 and the fourth parasitic patch 10 are also printed on four corners of the upper surface of the dielectric substrate 1; the first parasitic patch 7, the second parasitic patch 8, the third parasitic patch 9, and the fourth parasitic patch 10 are square.

the number of the magnetic dipole metal plates is four, and the four magnetic dipole metal plates are respectively a first magnetic dipole metal plate 13, a second magnetic dipole metal plate 14, a third magnetic dipole metal plate 15 and a fourth magnetic dipole metal plate 16; the first magnetic dipole metal plate 13 and the second magnetic dipole metal plate 14 are of two identical rectangular folding structures and are arranged below the first semi-elliptical crossed dipole metal patch 3 and the second semi-elliptical crossed dipole metal patch 4; the third magnetic dipole metal plate 15 and the fourth magnetic dipole metal plate 16 are of two identical rectangular folding structures and are arranged below the third semi-elliptical crossed dipole metal patch 5 and the fourth semi-elliptical crossed dipole metal patch 6; and is electrically connected to the metal floor 2. Preferably, the magnetic dipole metal plate is an aluminum plate or a copper plate.

The first half-elliptic crossed dipole metal patch 3 and the second half-elliptic crossed dipole metal patch 4 are connected with the second phase shift ring 12, arranged on the upper surface of the medium substrate 1 and connected with the inner core of the coaxial line 17; the third half-elliptic crossed dipole metal patch 5 and the fourth half-elliptic crossed dipole metal patch 6 are electrically connected with the first phase shift ring 11, arranged on the lower surface of the dielectric substrate 1 and electrically connected with the outer skin of the coaxial line 17; the SMP connector 18 is electrically connected to the coaxial line 17 through the metal floor 2.

Preferably, the metal sheets of the first half-elliptic crossed dipole metal patch 3, the second half-elliptic crossed dipole metal patch 4, the third half-elliptic crossed dipole metal patch 5 and the fourth half-elliptic crossed dipole metal patch 6 are aluminum plates or copper plates.

As an example, the metal floor 2 has a length of 80 mm, a width of 80 mm, and an overall height of the antenna of 26 mm. The dielectric constant of the dielectric substrate 1 is 3.5, the length of the dielectric substrate 1 is 38.2 mm, the width is 38.2 mm, and the thickness is 1 mm.

The first semi-elliptical crossed dipole metal patch 3, the second semi-elliptical crossed dipole metal patch 4, the third semi-elliptical crossed dipole metal patch 5 and the fourth semi-elliptical crossed dipole metal patch 6 are respectively printed on the upper surface and the lower surface of the medium substrate 1, the length of the long semi-axis of the medium substrate is 11 millimeters, and the length of the short semi-axis of the medium substrate is 7 millimeters.

Four cross-shaped gaps among the first semi-elliptical crossed dipole metal patch 3, the second semi-elliptical crossed dipole metal patch 4, the third semi-elliptical crossed dipole metal patch 5 and the fourth semi-elliptical crossed dipole metal patch 6 are etched in the centers of the first semi-elliptical crossed dipole metal patch 3, the second semi-elliptical crossed dipole metal patch 4, the third semi-elliptical crossed dipole metal patch 5 and the fourth semi-elliptical crossed dipole metal patch 6 respectively, the length is 8 millimeters, and the width is 5 millimeters.

the first parasitic patch 7, the second parasitic patch 8, the third parasitic patch 9 and the fourth parasitic patch 10 are formed by square metal patches with the length of 6 millimeters and are printed on the upper surface of the dielectric substrate 1; the first phase shift ring 11 and the second phase shift ring 11 are concentric circular arcs having a radius of 3.7 mm and a width of 1 mm.

And finally, welding the outer skin of the SMP connector 18 to the metal floor 2 to complete the broadband circularly polarized directional antenna applied to the wireless communication system,

the invention can be further illustrated by the following simulations:

1. Emulated content

The designed broadband circularly polarized antenna is subjected to electrical characteristic simulation analysis by adopting ANSYS Electronics Desktop, and the following simulation analysis calculation results can be obtained.

fig. 4 is a graph of voltage standing wave ratio versus frequency for the antenna of the present invention. The SMP connector is a signal input port. As can be seen from FIG. 4, the impedance matching bandwidth of the antenna of the invention is 73.4%2.55-5.51GHz, and the antenna can cover a wider wireless communication frequency band.

Fig. 5, fig. 7 and fig. 9 are the radiation patterns of the antenna in the XOZ plane when the frequency of the antenna is 3.0GHz, 4.0GHz and 5.0GHz respectively. Fig. 6, fig. 8 and fig. 10 are the radiation patterns of the antenna in the YOZ plane when the frequency of the antenna is 3.0GHz, 4.0GHz and 5.0GHz respectively. Therefore, the antenna has a stable directional diagram in the working frequency band, which shows that the broadband circularly polarized directional antenna applied to the wireless communication system has good radiation characteristics.

FIG. 11 is a graph of the circular polarization axial ratio of the antenna with frequency. As can be seen from FIG. 11, the 3dB axial ratio bandwidth of the antenna of the present invention is 71.4%2.69-5.68GHz, and the axial ratio bandwidth substantially covers the impedance bandwidth, so that the shared operating bandwidth is 68.8%2.69-5.51 GHz.

FIG. 12 is a graph of right hand circular polarization gain versus frequency for the antenna of the present invention. It can be seen that the gain of the antenna of the invention is stabilized within the range of 4.5-7.5dBi in the axial ratio bandwidth, and the requirement of the common wireless communication system is met.

The technical solution of the present invention is not limited to the limitations of the above specific embodiments, and all technical modifications made according to the technical solution of the present invention fall within the protection scope of the present invention.

As can be seen from the simulation analysis result of FIG. 4, the antenna has a voltage standing wave coefficient VSWR of less than or equal to 2.0 in the frequency range of 2.55GHz to 5.51GHz, and has good broadband working characteristics.

2. Antenna radiation pattern simulation analysis result

fig. 5 and 6 show the main polarization right-hand circular polarization and cross polarization left-hand circular polarization radiation patterns of the antenna at the frequency of 3.0GHz, the XOZ plane phi =0 ° plane and the YOZ plane phi =90 ° plane, respectively, where the main polarization right-hand circular polarization pattern is shown by a solid line and the cross polarization left-hand circular polarization pattern is shown by a dashed line.

as is clear from fig. 5 and 6, when F =3.0GHz, the antenna XOZ plane Φ =0 ° plane radiation pattern half-power beam width is 84 °, and the antenna YOZ plane Φ =90 ° plane radiation pattern half-power beam width is 86 °. From the cross level, the antenna has good circular polarization characteristics.

Fig. 7 and 8 show the main polarization right-hand circular polarization and cross polarization left-hand circular polarization radiation patterns of the antenna at a frequency of 4.0GHz, the XOZ plane Φ =0 ° plane and the YOZ plane Φ =90 ° plane, respectively, where the main polarization right-hand circular polarization pattern is shown by a solid line and the cross polarization left-hand circular polarization pattern is shown by a dashed line.

as is clear from fig. 7 and 8, when F =4.0GHz, the antenna XOZ plane Φ =0 ° plane radiation pattern half-power beam width is 83 °, and the antenna YOZ plane Φ =90 ° plane radiation pattern half-power beam width is 84 °. From the cross level, the antenna has good circular polarization characteristics.

Fig. 9 and 10 show the main polarization right-hand circular polarization and cross polarization left-hand circular polarization radiation patterns of the antenna at a frequency of 5.0GHz, respectively, for the XOZ plane Φ =0 ° plane and the YOZ plane Φ =90 ° plane, where the main polarization right-hand circular polarization pattern is shown by a solid line and the cross polarization left-hand circular polarization pattern is shown by a dashed line.

As is clear from fig. 9 and 10, when F =5.0GHz, the antenna XOZ plane Φ =0 ° plane radiation pattern half-power beam width is 112 °, and the antenna YOZ plane Φ =90 ° plane radiation pattern half-power beam width is 114 °. From the cross level, the antenna has good circular polarization characteristics.

As can be seen from FIG. 11, the axial ratio of the antenna is less than 3dB in the frequency band of 2.69 GHz-5.68 GHz, and the antenna has good circularly polarized radiation characteristics in a wide frequency band range.

As can be seen from fig. 12, the antenna has a gain of more than 4.5dBic in the frequency band of 2.5GHz to 5.5GHz and has stable radiation characteristics in a wide frequency band.

The components and structures of the present embodiments that are not described in detail are well known in the art and do not constitute essential structural elements or elements.