Antenna device

Abstract

This invention discloses an antenna device comprising a first insulating layer, a defective metal layer, a second insulating layer, and a plurality of radiators. The defective metal layer is disposed on the first insulating layer and has a plurality of periodically arranged trenches. The second insulating layer is disposed on the first insulating layer and the defective metal layer. The plurality of radiators are disposed on the second insulating layer, wherein each radiator has a feed portion and a ground portion.

Description

Technical Field

[0001] This invention relates to an antenna device, and more particularly to a multi-input multi-output (MIMO) antenna device. Background Technology

[0002] Fifth-generation mobile networks (5G) have flourished in recent years, and multi-input multi-output antenna systems (MIMO) for smartphones, laptops, and tablets have become a target of intense competition. How to fit multiple antenna devices into a limited space, achieve good performance, simplify manufacturing processes, and even modularize antenna devices has become an important issue for product sales.

[0003] Therefore, how to provide an antenna device that is small in size, easy to manufacture, and can cover multiple frequency bands has become a research target for private enterprises and academic institutions to invest a lot of money, manpower and time. Summary of the Invention

[0004] In view of this, an object of the present invention is to provide an antenna device that can solve the above-mentioned problems, comprising a first insulating layer, a defective metal layer, a second insulating layer, and a plurality of radiators. The defective metal layer is disposed on the first insulating layer and has a plurality of periodically arranged trench features. The second insulating layer is disposed on the first insulating layer and the defective metal layer. The plurality of radiators are disposed on the second insulating layer, wherein each radiator has a feed portion and a ground portion.

[0005] In one or more embodiments of the present invention, the plurality of trench features include a plurality of linear first trenches and a plurality of linear second trenches, the plurality of first trenches extending along a first direction and separated from each other, the plurality of second trenches extending along a second direction and separated from each other, wherein the plurality of first trenches and the plurality of second trenches intersect in a grid pattern.

[0006] In one or more embodiments of the present invention, a plurality of first grooves have a first width and a plurality of second grooves have a second width, wherein the ratio of the first width to the second width is between 1 and 5.

[0007] In one or more embodiments of the present invention, the first width is between 0.15 mm and 0.25 mm, and the second width is between 0.05 mm and 0.15 mm.

[0008] In one or more embodiments of the present invention, the ground portion of the radiator extends through the intersection of the first trench and the second trench.

[0009] In one or more embodiments of the present invention, the antenna device further includes a ground metal layer, wherein the ground metal layer is disposed below the first insulating layer, and the ground portion of the radiator is electrically connected to the ground metal layer.

[0010] In one or more embodiments of the present invention, the ground portion of the radiator passes through the first insulating layer and the second insulating layer.

[0011] In one or more embodiments of the present invention, the plurality of radiators include a plurality of first F-shaped radiators, each first F-shaped radiator further including a first free end, wherein the first free ends of two of the first F-shaped radiators and the first free ends of the other two of the first F-shaped radiators are respectively oriented in opposite directions along a first axial direction.

[0012] In one or more embodiments of the present invention, the plurality of radiators includes a plurality of second F-shaped radiators, wherein the second F-shaped radiators further include free ends, wherein the free ends of two of the plurality of second F-shaped radiators and the free ends of two other of the plurality of second F-shaped radiators are respectively oriented in opposite directions on a second axis, wherein the first axis is perpendicular to the second axis.

[0013] In one or more embodiments of the present invention, a plurality of first F-shaped radiators are located between a plurality of second F-shaped radiators.

[0014] In summary, the antenna device exhibits excellent isolation between its multiple radiators, for example, at least -15 dB of isolation, and is suitable for frequency bands of approximately 3.5 GHz. Furthermore, the defective metal layer further prevents the multiple radiators from being affected by surrounding metal conductors, thus enabling the antenna device to operate in multiple frequency bands under various environments.

[0015] The above description is only used to illustrate the problem that the present invention aims to solve, the technical means to solve the problem, and the effects it produces. The specific details of the present invention will be described in detail in the following embodiments and related figures. Attached Figure Description

[0016] To achieve the aforementioned advantages and features, the principles briefly described above will be explained in more detail with reference to embodiments, which are illustrated in the accompanying drawings. These drawings are merely illustrative of the invention and therefore do not limit the scope of the invention. The principles of the invention will be clearly explained through the drawings, and additional features and details will be fully described, wherein:

[0017] Figure 1 A three-dimensional schematic diagram of an antenna device is shown according to some embodiments of the present invention.

[0018] Figure 2 A top view of an antenna device is shown according to some embodiments of the present invention.

[0019] Figure 3 A schematic diagram of the first insulating layer and the defective metal layer of the antenna device is shown according to some embodiments of the present invention.

[0020] Figure 4 The drawing is as follows Figure 3 Enlarged view of the area within the dashed box.

[0021] Figure 5 A partial schematic diagram of an antenna device is shown according to some embodiments of the present invention.

[0022] Figure 6 according to Figure 1 Draw the cross-sectional view using section line 6-6.

[0023] Figure 7 A three-dimensional schematic diagram of an antenna device is shown according to some embodiments of the present invention.

[0024] Figure 8 A partial schematic diagram of an antenna device is shown according to some embodiments of the present invention.

[0025] Figure 9 The diagram illustrates the return loss of an antenna device in some embodiments of the present invention.

[0026] Symbol explanation:

[0027] 100: Antenna device

[0028] 110: First insulating layer

[0029] 130: Defective metal layer

[0030] 131: Trench Features

[0031] 131a: First trench

[0032] 131b: Second trench

[0033] 150: Second insulation layer

[0034] 170: Radiator

[0035] 170a: First F-shaped radiator

[0036] 170b: Second F-shaped radiator

[0037] 171: Feeding Department

[0038] 173: Grounding part

[0039] 175: Free End

[0040] 190: Grounding metal layer

[0041] E: Dashed box

[0042] W1: First width

[0043] W2: Second width

[0044] S1, S2: Curves

[0045] X: First axis

[0046] Y: Second axis Detailed Implementation

[0047] The following drawings disclose several embodiments of the present invention. For clarity, many practical details will be described in the following description. However, it should be understood that these practical details are not intended to limit the invention. That is, in some embodiments of the invention, these practical details are not essential. In addition, for the sake of simplicity, some conventional structures and elements will be shown in the drawings in a simple schematic manner.

[0048] Please refer to Figures 1 to 5 . Figure 1 A three-dimensional schematic diagram of an antenna device 100 is shown. The antenna device 100 includes a first insulating layer 110, a defective metal layer 130, a second insulating layer 150, and a plurality of radiators 170. Figure 2 A top view of the antenna device 100 is shown. Figure 3 The first insulating layer 110 and the defective metal layer 130 of the antenna device 100 are illustrated. Figure 4 The drawing is as follows Figure 3 Enlarged view of point E within the dashed box. Figure 5 The diagram illustrates the relative positions of the defective metal layer 130 and the plurality of radiators 170 of the antenna device 100 as viewed from top to bottom; the second insulating layer 150 is omitted. In some embodiments of the invention, the defective metal layer 130 is disposed on the first insulating layer 110, and the defective metal layer 130 has a plurality of periodically arranged trench features 131. Furthermore, the second insulating layer 150 is disposed on the first insulating layer 110 and the defective metal layer 130, and the plurality of radiators 170 are disposed on the second insulating layer 150, wherein each radiator 170 has a feed portion 171 and a ground portion 173. The defective metal layer 130 is configured to influence the current path of the plurality of radiators 170 and prevent the radiators 170 from being affected by surrounding metal conductors or each other, enabling the antenna device 100 to operate in multiple frequency bands under various environments, but the invention is not limited thereto.

[0049] Specifically, the first insulating layer 110 and the second insulating layer 150 comprise insulating materials, such as epoxy resin and / or glass fiber, but the invention is not limited thereto. Furthermore, the defective metal layer 130 and the radiator 170 comprise metallic materials, such as copper or copper alloys. The defective metal layer 130 may be formed from metal foil by laser cutting, etching, or machining, and the radiator 170 comprises an antenna with an F-shaped metal planar structure, but the invention is not limited thereto.

[0050] In some embodiments of the present invention, the plurality of trench features 131 of the defective metal layer 130 include a plurality of linear first trenches 131a and a plurality of linear second trenches 131b. The plurality of first trenches 131a extend collimatedly along a first axial direction X and are separated from each other, and are arranged at equal intervals. The plurality of second trenches 131b extend collimatedly along a second axial direction Y (the first axial direction X is perpendicular to the second axial direction Y) and are separated from each other, and are arranged at equal intervals. The plurality of first trenches 131a and the plurality of second trenches 131b form a grid-like intersecting mesh pattern. In some embodiments of the present invention, the feed portion 171 of the radiator 170 is electrically connected to a signal feed source, and the ground portion 173 of the radiator 170 is electrically connected to a ground source. Please refer to... Figure 6 , Figure 6 according to Figure 1 A cross-sectional view is drawn using section line 6-6. The grounding portion 173 of the radiator 170 extends through the first trench 131a and / or the second trench 131b. For example, the grounding portion 173 of the radiator 170 is located at the intersection of the first trench 131a and the second trench 131b, and the grounding portion 173 of the radiator 170 extends through the first insulating layer 110 and the second insulating layer 150 and contacts the grounding metal layer 190.

[0051] In some embodiments of the present invention, the first groove 131a has a first width W1, and the second groove 131b has a second width W2, wherein the first width W1 is greater than the second width W2, and the ratio of the first width W1 to the second width W2 is between 1 and 5. Preferably, the ratio of the first width W1 to the second width W2 is between 1.5 and 3.5, for example, the ratio of the first width W1 to the second width W2 is 2. In some embodiments of the present invention, the first width W1 is between 0.15 mm and 0.25 mm, and the second width W2 is between 0.05 mm and 0.15 mm. Preferably, the first width W1 is approximately 0.2 mm, and the second width W2 is approximately 0.1 mm, but the present invention is not limited thereto.

[0052] In some embodiments of the present invention, the plurality of radiators 170 includes four F-shaped radiators 170, each F-shaped radiator 170 further including a free end 175. The free ends 175 of two F-shaped radiators 170 and the free ends 175 of the other two F-shaped radiators 170 are respectively oriented in opposite directions along a first axial direction X. Furthermore, two of the four F-shaped radiators 170 are aligned along the first axial direction X, and two of the four F-shaped radiators 170 are also aligned along a second axial direction Y, exhibiting mirror symmetry, but the present invention is not limited thereto. Specifically, the ground feed portion 171 and the ground portion 173 of the plurality of radiators 170 extend in the same direction, while the free ends 175 extend in a direction different from the extending direction of the feed portion 171 and the ground portion 173, for example, the free ends 175 extend perpendicular to the extending direction of the feed portion 171 and the ground portion 173.

[0053] In other embodiments of the present invention, the antenna device 100 further includes a grounding metal layer 190 disposed below the first insulating layer 110 and electrically connected to the radiator 170 to provide a grounding effect. Furthermore, the antenna device 100 includes a conductive path disposed within the first insulating layer 110 and the second insulating layer 150. The conductive path can be a metal wire (e.g., a copper wire) passing through the first insulating layer 110 and the second insulating layer 150, so that the ground portion 173 of the F-shaped radiator 170 contacts the conductive path and is electrically connected to the grounding metal layer 190 through the conductive path. Specifically, the grounding metal layer 190 can be a flat metal foil, and therefore includes a metallic material, such as copper or a copper alloy, but the present invention is not limited thereto.

[0054] Please refer to Figure 7 and Figure 8 . Figure 7 A three-dimensional schematic diagram of the antenna device 100 is shown. Figure 8A diagram showing the relative positions of the defective metal layer 130 and the plurality of radiators 170 is provided, omitting the second insulating layer 150. In some embodiments of the invention, the plurality of radiators 170 includes four first F-shaped radiators 170a and four second F-shaped radiators 170b, wherein the plurality of first F-shaped radiators 170a are located between the plurality of second F-shaped radiators 170b, and the plurality of second F-shaped radiators 170b surround the plurality of first F-shaped radiators 170a. Furthermore, the free ends 175 of two first F-shaped radiators 170a and the free ends 175 of the other two first F-shaped radiators 170a face opposite directions along the first axial direction X. The second F-shaped radiators 170b further include free ends 175, wherein the free ends 175 of two second F-shaped radiators 170b and the free ends 175 of the other two second F-shaped radiators 170b face opposite directions along the second axial direction Y, but the invention is not limited thereto.

[0055] In some embodiments of the present invention, two of the four first F-shaped radiators 170a are aligned along the first axis X, and the other two of the four first F-shaped radiators 170a are also aligned along the second axis Y, thus the four first F-shaped radiators 170a exhibit mirror symmetry. Furthermore, two of the four second F-shaped radiators 170b are aligned along the first axis X, and the other two of the four second F-shaped radiators 170b are also aligned along the second axis Y, thus the four second F-shaped radiators 170b also exhibit mirror symmetry. Specifically, the four first F-shaped radiators 170a and the four second F-shaped radiators 170b together exhibit mirror symmetry, but the present invention is not limited thereto.

[0056] Please refer to Figure 9 . Figure 9 The drawing is as follows Figure 7 and Figure 8 The return loss comparison diagram of the antenna device 100 shows that curves S1 and S2 represent the first F-shaped radiator 170a and the second F-shaped radiator 170b, respectively. As can be seen from the diagram, the antenna device 100 is well-suited for a frequency band of approximately 3.5 GHz. Furthermore, the plurality of first F-shaped radiators 170a and the plurality of second F-shaped radiators 170b have an isolation of approximately -15 dB, therefore the first F-shaped radiators 170a and the second F-shaped radiators 170b will not interfere with each other, and the antenna device 100 of the present invention can even avoid being affected or interfered with by surrounding metal conductors.

[0057] In summary, the antenna device exhibits excellent isolation between its multiple radiators, for example, at least -15 dB of isolation, and is suitable for frequency bands of approximately 3.5 GHz. Furthermore, the defective metal layer further prevents the multiple radiators from being affected by surrounding metal conductors, thus enabling the antenna device to operate in multiple frequency bands under various environments.

[0058] Different embodiments of the present invention have been described above. It should be understood that these different embodiments are presented as examples only and are not intended to limit the scope of the invention. Many modifications can be made to the embodiments of this application based on the disclosure herein without departing from the spirit and scope of the invention. Therefore, the breadth and scope of the present invention should not be limited to the embodiments described above.

Claims

1. An antenna device, characterized in that, include: First insulating layer; A defective metal layer is disposed on the first insulating layer, the defective metal layer having a plurality of periodically arranged trench features; A second insulating layer is disposed on the first insulating layer and the defective metal layer; as well as Multiple radiators are disposed on the second insulating layer, wherein each of the multiple radiators has a feed-in portion and a ground portion; The plurality of groove features include a plurality of linear first grooves and a plurality of linear second grooves, the plurality of first grooves extending along a first direction and being separated from each other, the plurality of second grooves extending along a second direction and being separated from each other, wherein the plurality of first grooves and the plurality of second grooves intersect in a grid pattern. The grounding portion of the plurality of radiators extends through the intersection of the plurality of first trenches and the plurality of second trenches.

2. The antenna device as claimed in claim 1, characterized in that, The plurality of first grooves have a first width, and the plurality of second grooves have a second width, wherein the ratio of the first width to the second width is between 1 and 5.

3. The antenna device as described in claim 2, characterized in that, The first width is between 0.15 mm and 0.25 mm, and the second width is between 0.05 mm and 0.15 mm.

4. The antenna device as claimed in claim 1, characterized in that, It further includes a grounding metal layer, wherein the grounding metal layer is disposed below the first insulating layer, and the grounding portion of the plurality of radiators is electrically connected to the grounding metal layer.

5. The antenna device as described in claim 4, characterized in that, The ground portion of the plurality of radiators passes through the first insulating layer and the second insulating layer.

6. The antenna device as claimed in claim 1, characterized in that, The plurality of radiators includes a plurality of first F-shaped radiators, wherein the plurality of first F-shaped radiators further includes free ends, wherein the plurality of free ends of two of the plurality of first F-shaped radiators and the plurality of free ends of the other two of the plurality of first F-shaped radiators are respectively oriented in opposite directions along a first axis.

7. The antenna device as claimed in claim 6, characterized in that, The plurality of radiators includes a plurality of second F-shaped radiators, wherein the plurality of second F-shaped radiators further includes free ends, wherein the plurality of free ends of two of the plurality of second F-shaped radiators and the plurality of free ends of two other of the plurality of second F-shaped radiators are respectively oriented in opposite directions on a second axis, wherein the first axis is perpendicular to the second axis.

8. The antenna device as claimed in claim 7, characterized in that, The plurality of first F-shaped radiators are located between the plurality of second F-shaped radiators.

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