TW202322464A - Antenna device - Google Patents

Abstract

An antenna device includes a first insulating layer, a defected ground layer, a second insulating layer, and a plurality of radiators. The defected ground layer is located on the first insulating layer, and the defected ground layer includes a plurality of trench features which are periodically arranged. The second insulating layer is located on the first insulating layer and the defected ground layer. The radiators are located on the second insulating layer, and each radiator has a feeding portion and a grounding portion.

Description

Antenna device

The present invention relates to an antenna device, in particular to a multi-reception multi-transmission (Multi-input Multi-output; MIMO) antenna device.

The 5th generation mobile networks (5G) has been developing rapidly in recent years, and the multi-input multi-output antenna system applied to smartphones, notebook computers, and tablet computers has become the target of all sectors of competition. How to place a multi-antenna device in a limited space, so that the multi-antenna device has good performance and simple manufacturing process, and even the modularization of the antenna device has become an important issue for product sales.

Therefore, how to provide an antenna device that is small in size, simple in manufacturing process and capable of covering multiple frequency bands has become a research target for private enterprises and academic institutions to spend a lot of money, manpower and time.

In view of this, an object of the present invention is to provide an antenna device capable of solving the above problems, which includes a first insulating layer, a defective metal layer, a second insulating layer, and a plurality of radiators. The defect metal layer is disposed on the first insulating layer, and the defect metal layer has a plurality of trench features arranged periodically. The second insulating layer is disposed on the first insulating layer and the defective metal layer. A plurality of radiators are disposed on the second insulating layer, and each radiator has a feed-in portion and a ground portion.

In one or more embodiments of the present invention, the plurality of groove features include a plurality of linear first grooves and a plurality of linear second grooves, and the plurality of first grooves extend along the first direction and are adjacent to each other. Separated, the plurality of second grooves extend along the second direction and are separated from each other, wherein the plurality of first grooves intersect with the plurality of second grooves in a grid pattern.

In one or more embodiments of the present invention, 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 between.

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.

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.

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 under the first insulating layer, and the ground portion of the radiator is electrically connected to the ground metal layer.

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.

In one or more embodiments of the present invention, the plurality of radiators include a plurality of first F-shaped radiators, and the first F-shaped radiators further include a first free end, wherein the first F-shaped radiators The first free ends of the two and the other two first free ends of the first F-shaped radiator face opposite directions on the first axis respectively.

In one or more embodiments of the present invention, wherein the plurality of radiators include a plurality of second F-shaped radiators, wherein the second F-shaped radiators further include free ends, wherein two of the plurality of second F-shaped radiators The free end of the one and the free ends of the other two of the plurality of second F-shaped radiators respectively face opposite directions on the second axis, wherein the first axis is perpendicular to the second axis.

In one or more embodiments of the present invention, the multiple first F-shaped radiators are located between the multiple second F-shaped radiators.

To sum up, the multiple radiators of the antenna device have excellent isolation, for example, the multiple radiators have an isolation of at least -15 dB and are applicable to a frequency band of about 3.5 GHz. In addition, the defective metal layer can prevent multiple radiators from being affected by surrounding metal conductors, so the antenna device can operate in multiple frequency bands under various environments.

The above description is only used to illustrate the problem to be solved by the present invention, the technical means for solving the problem, and the effects thereof, etc. The specific details of the present invention will be described in detail in the following implementation methods and related drawings.

Several embodiments of the present invention will be disclosed in the following figures. For the sake of clarity, many practical details will be described together in the following description. It should be understood, however, that these practical details should not be used to limit the invention. That is, in some embodiments of the present invention, these practical details are unnecessary. In addition, for the sake of simplifying the drawings, some commonly used structures and elements will be shown in a simple and schematic manner in the drawings.

Please refer to pictures 1 to 5. FIG. 1 shows a perspective view of an antenna device 100 . 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 . FIG. 2 shows a top view of the antenna device 100 . FIG. 3 shows the first insulating layer 110 and the defective metal layer 130 of the antenna device 100 . Figure 4 is an enlarged view of the dotted box E in Figure 3. FIG. 5 shows a relative positional relationship diagram of the defective metal layer 130 and the plurality of radiators 170 viewed from above of the antenna device 100 , and the second insulating layer 150 is omitted. In some embodiments of the present invention, the defective metal layer 130 is disposed on the first insulating layer 110 , and the defective metal layer 130 has a plurality of trench features 131 arranged periodically. In addition, the second insulating layer 150 is disposed on the first insulating layer 110 and the defective metal layer 130 , and a plurality of radiators 170 are disposed on the second insulating layer 150 , wherein each radiator 170 has a feeding portion 171 and a grounding portion 173 . The defective metal layer 130 is configured to affect the current paths of the plurality of radiators 170 and prevent the radiators 170 from being affected by the surrounding metal conductors or each other, so that the antenna device 100 can operate in multiple frequency bands under various environments, but the present invention does not rely on This is the limit.

Specifically, the first insulating layer 110 and the second insulating layer 150 include insulating materials, such as epoxy resin (epoxy) and/or glass fiber (glass fiber), but the present invention is not limited thereto. In addition, the defective metal layer 130 and the radiator 170 include metal materials, such as copper or copper alloys. The defective metal layer 130 can be made of metal foil through laser cutting, etching or cutting, and the radiator 170 includes an antenna with an F-shaped metal planar structure, but the invention is not limited thereto.

In some embodiments of the present invention, the plurality of trench features 131 of the defective metal layer 130 includes a plurality of linear first trenches 131a and a plurality of linear second trenches 131b, and the plurality of first trenches 131a are along the The first axis X extends in alignment and is separated from each other, a plurality of first grooves 131a are arranged at equal intervals, and a plurality of second grooves 131b are along the second axis Y (the first axis X is perpendicular to the second axis Y) Extending in alignment and separated from each other, the plurality of second grooves 131b are arranged at equal intervals, wherein the plurality of first grooves 131a and the plurality of second grooves 131b present a grid-like intersecting mesh pattern. In some embodiments of the present invention, the feed-in portion 171 of the radiator 170 is electrically connected to a signal feed-in source, and the ground portion 173 of the radiator 170 is electrically connected to a ground source. Please refer to Figure 6, Figure 6 draws a cross-section according to section line 6-6 in Figure 1. The ground portion 173 of the radiator 170 extends through the first groove 131a and/or the second groove 131b, for example, the ground portion 173 of the radiator 170 is disposed at the intersection of the first groove 131a and the second groove 131b, and The ground portion 173 of the radiator 170 extends through the first insulation layer 110 and the second insulation layer 150 and contacts the ground metal layer 190 .

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 first width W1 is the same as the second width W1. The ratio of the 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.

In some embodiments of the present invention, the multiple radiators 170 include four F-shaped radiators 170, the F-shaped radiators 170 further include free ends 175, the free ends 175 of the two F-shaped radiators 170 and the other two F-shaped radiators 170 The free ends 175 of the shaped radiator 170 respectively face opposite directions on the first axis X. In addition, two of the four F-shaped radiators 170 are aligned along the first axis X, and two of the four F-shaped radiators 170 are also aligned along the second axis Y, and the four F-shaped radiators 170 present The mirror image is symmetrical, but the present invention is not limited thereto. Specifically, the ground portion feeding portion 171 and the ground portion 173 of the plurality of radiators 170 extend toward the same direction, and the free end 175 extends toward a direction different from that of the feeding portion 171 and the ground portion 173, for example, the free end 175 is perpendicular to the The extending direction of the entry portion 171 and the ground portion 173 extends.

In some other embodiments of the present invention, the antenna device 100 further includes a grounding metal layer 190, the grounding metal layer 190 is disposed under the first insulating layer 110, and the grounding metal layer 190 is electrically connected to the radiator 170 to provide a grounding effect. . In addition, the antenna device 100 further includes a conductive path, the conductive path is disposed in the first insulating layer 110 and the second insulating layer 150, wherein the conductive path can be a metal wire (such as a copper wire), and the metal wire passes 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 ground metal layer 190 through the conductive path. Specifically, the ground metal layer 190 may be a flat metal foil, so the ground metal layer 190 includes a metal material, such as copper or copper alloy, but the invention is not limited thereto.

Please refer to Figure 7 and Figure 8. FIG. 7 is a schematic perspective view of the antenna device 100 . FIG. 8 shows the relative positional relationship between the defective metal layer 130 and the plurality of radiators 170 and the second insulating layer 150 is omitted. In some embodiments of the present invention, the plurality of radiators 170 include four first F-shaped radiators 170a and four second F-shaped radiators 170b, wherein the plurality of first F-shaped radiators 170a are located in the plurality of second F-shaped radiators. Between the two F-shaped radiators 170b, a plurality of second F-shaped radiators 170b surrounds a plurality of first F-shaped radiators 170a. In addition, the free ends 175 of the two first F-shaped radiators 170 a and the free ends 175 of the other two first F-shaped radiators 170 a face opposite directions on the first axis X, respectively. The second F-shaped radiator 170b further includes free ends 175, wherein the free ends 175 of the two second F-shaped radiators 170b and the free ends 175 of the other two second F-shaped radiators 170b respectively face the second axis Y. but the present invention is not limited thereto.

In some embodiments of the present invention, two of the four first F-shaped radiators 170a are aligned along the first axis X, and two of the four first F-shaped radiators 170a are also aligned along the second axis Y. Therefore, the four first F-shaped radiators 170a exhibit mirror symmetry. In addition, two of the four second F-shaped radiators 170b are aligned along the first axis X, and two of the four second F-shaped radiators 170b are also aligned along the second axis Y, so the four fourth The two F-shaped radiators 170b also exhibit mirror symmetry. Specifically, the four first F-shaped radiators 170 a and the four second F-shaped radiators 170 b together exhibit mirror symmetry, but the present invention is not limited thereto.

Please refer to Figure 9. FIG. 9 is a comparison diagram of the return loss of the antenna device 100 in FIG. 7 and FIG. 8 , wherein curves S1 and S2 represent the first F-shaped radiator 170a and the second F-shaped radiator 170b respectively. It can be seen from the figure that the antenna device 100 is well applicable to a frequency band of about 3.5 GHz. In addition, the isolation between the first F-shaped radiators 170a and the second F-shaped radiators 170b is about -15 dB, so the distance between the first F-shaped radiators 170a and the second F-shaped radiators 170b They will not interfere with each other, and even the antenna device 100 of the present invention can avoid being affected or interfered by surrounding metal conductors.

To sum up, the multiple radiators of the antenna device have excellent isolation, for example, the multiple radiators have an isolation of at least -15 dB and are applicable to a frequency band of about 3.5 GHz. In addition, the defective metal layer can prevent multiple radiators from being affected by surrounding metal conductors, so the antenna device can operate in multiple frequency bands under various environments.

While various embodiments of the present invention have been described above, it should be understood that the various embodiments have been presented by way of example only, and not limitation. Many changes may be made to the disclosed embodiments in light of the disclosure herein without departing from the spirit and scope of the invention. Thus, the breadth and scope of the present invention should not be limited by the above-described embodiments.

100: Antenna device 110: the first insulating layer 130: defective metal layer 131: Groove feature 131a: first groove 131b: second groove 150: second insulating layer 170: radiator 170a: the first F-shaped radiator 170b: the second F-shaped radiator 171: Feed-in part 173: Grounding part 175: free end 190: Ground metal layer E: dotted frame W1: first width W2: second width S1, S2: curve X: the first axis Y: the second axis

In order to achieve the above advantages and features, the principles of the above brief description will be more specifically explained with reference to the embodiments shown in the accompanying drawings. These drawings illustrate the invention only, and therefore do not limit the scope of the invention. The principles of the invention will be clearly explained and additional features and details will be fully described by means of the accompanying drawings, in which: FIG. 1 is a schematic perspective view of an antenna device according to some embodiments of the present invention. FIG. 2 shows a top view of an antenna device according to some embodiments of the present invention. FIG. 3 is a schematic diagram illustrating a first insulating layer and a defective metal layer of an antenna device according to some embodiments of the present invention. Figure 4 is an enlarged view of the dotted box in Figure 3. FIG. 5 is a partial schematic diagram of an antenna device according to some embodiments of the present invention. Fig. 6 draws a cross-sectional view according to section line 6-6 in Fig. 1 . FIG. 7 is a schematic perspective view of an antenna device according to some embodiments of the present invention. FIG. 8 is a partial schematic diagram of an antenna device according to some embodiments of the present invention. FIG. 9 is a graph showing the return loss of the antenna device in some embodiments of the present invention.

100: Antenna device

110: the first insulating layer

130: defective metal layer

131: Groove feature

131a: first groove

131b: second groove

150: second insulating layer

170: radiator

171: Feed-in part

173: Grounding part

175: free end

190: Ground metal layer

6-6: Hatching

Claims (10)

An antenna device comprising: first insulating layer; A defective metal layer is disposed on the first insulating layer, and the defective metal layer has a plurality of trench features arranged periodically; a second insulating layer disposed on the first insulating layer and the defective metal layer; and A plurality of radiators are disposed on the second insulating layer, wherein each of the radiators has a feed-in portion and a ground portion. The antenna device according to claim 1, wherein the groove features include a plurality of linear first grooves and a plurality of linear second grooves, and the first grooves extend along the first direction and are separated from each other , the second grooves extend along the second direction and are separated from each other, wherein the first grooves intersect with the second grooves in a grid pattern. The antenna device according to claim 2, wherein the first grooves have a first width, and the second grooves have a second width, wherein the ratio of the first width to the second width is between 1 and between 5. The antenna device as claimed in claim 2, wherein the first width is between 0.15mm and 0.25mm, and the second width is between 0.05mm and 0.15mm. The antenna device as claimed in claim 2, wherein the ground portions of the radiators extend through intersections of the first grooves and the second grooves. The antenna device according to claim 1 further includes a ground metal layer, wherein the ground metal layer is disposed under the first insulating layer, and the ground portions of the radiators are electrically connected to the ground metal layer. The antenna device according to claim 6, wherein the ground portions of the radiators pass through the first insulating layer and the second insulating layer. The antenna device as described in claim 1, wherein the radiators include a plurality of first F-shaped radiators, wherein the first F-shaped radiators further include free ends, and the two of the first F-shaped radiators The free ends of the first F-shaped radiator and the free ends of the other two of the first F-shaped radiators respectively face opposite directions on the first axis. The antenna device as described in Claim 8, wherein the radiators include a plurality of second F-shaped radiators, wherein the second F-shaped radiators further include free ends, and the two of the second F-shaped radiators The free ends of the first one and the free ends of the other two of the second F-shaped radiators respectively face opposite directions on the second axis, wherein the first axis is perpendicular to the second axis. The antenna device according to claim 9, wherein the first F-shaped radiators are located between the second F-shaped radiators.

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