阅读说明：本技术 宽带共面波导结构栅格阵列天线 (Broadband coplanar waveguide structure grid array antenna ) 是由 徐光辉 尤征伟 朱浩然 黄志祥 于 2021-09-06 设计创作，主要内容包括：本发明提供了一种涉及微波天线技术领域宽带共面波导结构栅格阵列天线,包括辐射体、介质基板、金属通孔、地平面以及金属贴片；地平面位于介质基板下侧,辐射体和金属贴片分别位于介质基板上侧,金属通孔贯穿介质基板,金属通孔一端连接地平面、另一端连接金属贴片,通过金属通孔将金属贴片与地平面电连接；辐射体呈栅格列阵,金属贴片与介质基板形成共面波导结构。本发明将传统栅格阵列天线进行变形,设计一种共面波导结构栅格阵列天线,实现了宽带特性。本发明基于栅格阵列天线实现更多天线功能,增加设计自由度。(The invention provides a broadband coplanar waveguide structure grid array antenna relating to the technical field of microwave antennas, which comprises a radiator, a dielectric substrate, a metal through hole, a ground plane and a metal patch, wherein the radiator is arranged on the dielectric substrate; the ground plane is positioned at the lower side of the dielectric substrate, the radiator and the metal patch are respectively positioned at the upper side of the dielectric substrate, the metal through hole penetrates through the dielectric substrate, one end of the metal through hole is connected with the ground plane, the other end of the metal through hole is connected with the metal patch, and the metal patch is electrically connected with the ground plane through the metal through hole; the radiator is in a grid array, and the metal patch and the dielectric substrate form a coplanar waveguide structure. The invention designs the grid array antenna with the coplanar waveguide structure by deforming the traditional grid array antenna, thereby realizing the broadband characteristic. The invention realizes more antenna functions based on the grid array antenna and increases the design freedom.)

1. A broadband coplanar waveguide structure grid array antenna is characterized by comprising a radiator (1), a ground plane (2), a dielectric substrate (3), a metal through hole (4) and a metal patch (5);

the ground plane (2) is located on the lower side of the dielectric substrate (3), the radiator (1) and the metal patch (5) are respectively located on the upper side of the dielectric substrate (3), the metal through hole (4) penetrates through the dielectric substrate (3), one end of the metal through hole (4) is connected with the ground plane (2), the other end of the metal through hole is connected with the metal patch (5), and the metal patch (5) is electrically connected with the ground plane (2) through the metal through hole (4); the radiator (1) is in a grid array, and the metal patch (5) and the dielectric substrate (3) form a coplanar waveguide structure.

2. A broadband coplanar waveguide structure grid array antenna according to claim 1, wherein the dielectric substrate (3) is a cuboid and has a width s_x28mm, length s_y32mm, thickness t 0.787mm, and dielectric constant ε_rThe loss angle tan δ of the dielectric substrate is 0.0009, 2.2.

3. A broadband coplanar waveguide structure grid array antenna according to claim 1, wherein the ground plane (2) is rectangular and the width of the ground plane (2) is g_x＝s_x28mm, length g_y＝s_y＝32mm。

4. A wideband coplanar waveguide structure grid array antenna according to claim 1, characterized in that the radiator (1) is provided with a feed point, and the radiator (1) is fed with a differential coaxial feed of 50 Ω.

5. A broadband coplanar waveguide structure grid array antenna according to claim 4, characterized in that the length S of the short side of the radiating plate (1)_l3.84mm, shortWidth S of the edge_w0.9mm, length L of long side_lWidth L of long side of 8mm_W＝0.6mm。

6. A wideband coplanar waveguide structure grid array antenna according to claim 1, characterized in that the metal patches (5) comprise an inner patch (51) and an outer patch (52), the inner patch (51) being connected to the radiator (1), the outer patch (52) being located on the dielectric substrate (3) outside the radiator (1).

7. A broadband coplanar waveguide structure grid array antenna according to claim 6, wherein the outer boundary of the inner patch (51) is at a distance d of 0.8mm from the grid boundary.

8. A broadband coplanar waveguide structure grid array antenna according to claim 6, wherein the metal vias (4) comprise inner vias (41) and outer vias (42), the inner vias (41) being connected to the inner patch (51), the outer vias (42) being connected to the outer patch (52), the outer vias (42) having a diameter d 1-0.3 mm, the inner vias having a diameter d₂＝0.5mm。

9. The wideband coplanar waveguide structure grid array antenna as set forth in claim 1, wherein the orthogonal spatial coordinate system o-xyz is provided, comprising: origin o, x-axis, y-axis, z-axis;

the dielectric substrate (3) is parallel to the xoy surface of the space rectangular coordinate system o-xyz.

10. A broadband coplanar waveguide structure grid array antenna according to claim 8 or 9, wherein the outer via (42) is located at a distance/from the inner boundary of the outer patch (52)_x1.04mm, the distance of the inner through hole (41) from the boundary of the inner patch (51) parallel to the y axis is l_x＝1.04mm。

Technical Field

The invention relates to the technical field of microwave antennas, in particular to a broadband coplanar waveguide structure grid array antenna.

Background

The grid array antenna is widely applied due to the characteristics of low cost, simple structure, convenient feeding and the like. The rapid development of grid array antennas has led to more design freedom in the antenna structure. The invention is an improvement on the basis of a grid array antenna, and the working bandwidth of the grid array antenna is increased.

The invention discloses a dual-band microstrip grid array antenna, which belongs to the field of automobile parts, and is found through the search of the prior art patent document, wherein the Chinese invention patent publication number is CN 109462038A. The antenna comprises an antenna radiator, a dielectric substrate and a ground plane; the radiator is arranged on the upper surface of the dielectric substrate in parallel; the ground plane is arranged on the lower surface of the medium substrate in parallel. The antenna comprises an antenna radiator, a metal patch, a metal through hole, a dielectric substrate and a ground plane; the radiator and the metal patch are arranged on the upper surface of the dielectric substrate in parallel; the ground plane is arranged on the lower surface of the medium substrate in parallel; the metal through hole is used for electrically connecting the ground plane and the metal patch. The invention expands the broadband characteristic on the basis of a grid array antenna. Therefore, the method disclosed in the document and the invention belong to different inventive concepts.

Disclosure of Invention

In view of the shortcomings in the prior art, it is an object of the present invention to provide a broadband coplanar waveguide structure grid array antenna.

The invention provides a broadband coplanar waveguide structure grid array antenna which comprises a radiator, a dielectric substrate, a metal through hole, a ground plane and a metal patch, wherein the dielectric substrate is arranged on the upper surface of the radiator; the ground plane is positioned at the lower side of the dielectric substrate, the radiator and the metal patch are respectively positioned at the upper side of the dielectric substrate, the metal through hole penetrates through the dielectric substrate, one end of the metal through hole is connected with the ground plane, the other end of the metal through hole is connected with the metal patch, and the metal patch is electrically connected with the ground plane through the metal through hole; the radiator is in a grid array, and the metal patch and the dielectric substrate form a coplanar waveguide structure.

In some embodiments, the dielectric substrate is a cuboid, and the width s of the dielectric substrate_x28mm longDegree s_y32mm, thickness t 0.787mm, and dielectric constant ε_rThe loss angle tan δ of the dielectric substrate is 0.0009, 2.2.

In some embodiments, the ground plane is rectangular and has a width g_x＝s_x28mm, length g_y＝s_y＝32mm。

In some embodiments, the radiator is provided with a feeding point, and the radiator adopts omega differential coaxial feeding.

In some embodiments, the length S of the short side of the panel_l3.84mm, width S of the short side_w0.9mm, length L of long side_lWidth L of long side of 8mm_W＝0.6mm。

In some embodiments, the metal patch includes an inner patch and an outer patch, the inner patch is connected to the radiator, and the outer patch is located on the dielectric substrate outside the radiator.

In some embodiments, the outer boundary of the inner patch is 0.8mm from the grid boundary.

In some embodiments, the metal vias include an inner via connected to the inner patch and an outer via connected to the outer patch, the outer via having a diameter d 1-0.3 mm, and the inner via having a diameter d 2-0.5 mm.

In some embodiments, let a spatial rectangular coordinate system o-xyz, include: origin o, x-axis, y-axis, z-axis; the dielectric substrate is parallel to the xoy surface of the space rectangular coordinate system o-xyz.

In some embodiments, the outer via is spaced from the inner boundary of the outer patch by a distance l_x1.04mm, the distance between the inner through hole and the boundary of the inner patch parallel to the y axis is l_x＝1.04mm。

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

1. the invention designs the grid array antenna with the coplanar waveguide structure by deforming the traditional grid array antenna, thereby increasing the working bandwidth and realizing the broadband characteristic.

2. The invention realizes more antenna functions based on the grid array antenna and increases the design freedom.

Drawings

Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:

FIG. 1 is a schematic three-dimensional structure of a grid array antenna according to the present invention;

FIG. 2 is a top view of a grid array antenna of the present invention;

FIG. 3 is a schematic three-dimensional structure of a lattice array antenna with a coplanar waveguide structure according to the present invention;

FIG. 4 is a top view of a coplanar waveguide structure grid array antenna of the present invention;

FIG. 5 is a graph of the reflection coefficient of a grid array antenna of the present invention;

FIG. 6 is a graph of reflection coefficient of a coplanar waveguide structure grid array antenna according to the present invention;

FIG. 7 is a normalized cross-polarization pattern at 28GHz for a coplanar waveguide structured grid array antenna of the present invention;

fig. 8 is a normalized cross-polarization pattern at 30GHz for a coplanar waveguide structure grid array antenna of the present invention.

Reference numbers in the figures:

Detailed Description

The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that it would be obvious to those skilled in the art that various changes and modifications can be made without departing from the spirit of the invention. All falling within the scope of the present invention.

Example 1

The invention provides a grid array antenna, which comprises a radiator 1, a ground plane 2 and a dielectric substrate 3; the ground plane 2 is located at the lower side of the dielectric substrate 3, and preferably, the ground plane 2 is copper-clad on the lower surface of the dielectric substrate 3. The radiators 1 are located on the upper side of the dielectric substrate 3, and preferably, the radiators 1 are in a grid array.

As shown in fig. 1-2, using the HFSS optimized grid antenna, the radiator 1 employs a 50 Ω differential coaxial feed. Length S of short side of radiator 1_l3.84mm, width S of the short side_w0.9mm, length L of long side_l8mm long side width L_W＝0.6mm。

Wherein, the ground plane 2 and the medium substrate 3 have the same length and width, and the width of the ground plane 2 is g_x＝s_x28mm, length g_y＝s_y＝32mm。

The impedance matching is realized by adjusting the feeding position, and the corresponding reflection coefficient is shown in fig. 5; the-10 dB impedance bandwidth is 3.8% (27.87GHz-28.95 GHz).

Example 2

This embodiment 2 is a broadband coplanar waveguide structure grid array antenna formed on the basis of embodiment 1. And different machine-made substrate parameters are added, and parameters of each component are optimized, so that the working broadband of the system is enhanced. Specifically, the method comprises the following steps:

the metal patch 5 and the dielectric substrate 3 form a coplanar waveguide structure. The metal through hole 4 penetrates through the dielectric substrate 3, one end of the metal through hole 4 is connected with the ground plane 2, the other end of the metal through hole is connected with the metal patch 5, the metal patch 5 is electrically connected with the ground plane 2 through the metal through hole 1, and the radiator 1 is electrically connected with the ground plane 2 through the metal through hole 4.

As shown in FIGS. 3 and 4, the dielectric substrate 3 is a rectangular parallelepiped, and the width s of the dielectric substrate 3_x28mm, length s_yThe dielectric substrate 3 is a Rogers RT 5880 substrate with a dielectric constant ε, and has a thickness t of 0.787mm and a thickness of 32mm_rThe loss angle tan δ of the dielectric substrate is 0.0009, 2.2.

The outer boundary of the inner patch 51 is spaced from the grid boundary by a distance d of 0.8 mm. The metal patch 5 includes an inner patch 51 and an outer patch 52, the inner patch 51 is connected to the dielectric substrate 3 outside the radiator 1, the outer patch 52 is located on the dielectric substrate 3 outside the radiator 1, and the feeding point is located between the inner patches 51.

The metal through hole 4 comprises an inner through hole 41 and an outer through hole 42, the inner through hole 41 is connected with the inner patch 51, the outer through hole 42 is connected with the outer patch 52, the diameter of the outer through hole 42 is d 1-0.3 mm, and the diameter of the inner through hole is d 2-0.5 mm.

The outer through hole 42 is spaced from the inner boundary of the outer patch 52 by a distance l_x1.04mm, the distance l of the inner through hole 41 from the boundary of the inner patch 51 parallel to the y-axis_x＝1.04mm。

More specifically, the ground plane 2 is rectangular, and the width of the ground plane is g_x＝s_x28mm, length g_y＝s_y32 mm. Length S of the first radiation plate 11_l3.84mm, width S_w0.9mm, the length L of the second radiation plate 12_l8mm, width L_W0.6 mm. The distance d between the inner and outer boundaries of the metal patch 5 and the grid boundary is 0.8mm, and the space rectangular coordinate system o-xyz comprises: origin o, x-axis, y-axis, z-axis. The corresponding reflection coefficient is shown in FIG. 6, and the-10 dB relative bandwidth reaches 29% (21.69GHz-29.04GHz), compared to 3.8% (27.87GHz-28.95GHz) in example 1.

In summary, the comparison of the results shows that the operation bandwidth in embodiment 2 is enhanced. Fig. 7 and 8 are normalized cross-polarization patterns of the proposed antenna at 28GHz and 30GHz with polarization levels below-40 dB, good polarization levels, and meeting design requirements.

In the description of the present application, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present application.

The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.