2.4 GHZ built-in FPCB antenna and Bluetooth bone conduction earphone using same

Abstract

The utility model relates to a 2.4 GHZ built-in FPCB antenna and a Bluetooth bone conduction earphone using the 2.4 GHZ built-in FPCB antenna. A PI substrate is provided with a first radiation unit and a second radiation unit which are separated from each other. The first radiation unit comprises a downward arc-shaped part, one end of the downward arc-shaped part is provided with a step, the middle of the top of the downward arc-shaped part is provided with a first feeding point, and the first feeding point is welded with a ground wire of a coaxial line; the second radiating unit comprises an upper hook-shaped part, an upward arc-shaped part and a lower step part, one end of the upward arc-shaped part is connected with the upper hook-shaped part, the other end of the upward arc-shaped part is connected with the lower step part, a second feeding point is arranged at the upper end of the lower step part, and the second feeding point is welded with a core wire of the coaxial line to serve as a radiating body of the antenna; and the first feeding point is clamped between the step and the lower step part and is positioned right below the second feeding point. The utility model not only has good receiving and transmission quality and high sensitivity, but also has a simple structure, is easy to produce in batches and convenient to install, saves the cost and improves the communication quality.

Description

Technical Field

[0001] The utility model relates to an antenna, in particular to a 2.4GHZ built-in FPCB antenna and a Bluetooth bone conduction headset using the same. Background Art

[0002] In recent years, wireless communication systems have been widely used in various fields. With the development of technology, the diversification of the size of electronic products and the upsurge of portable devices have made the related antennas have to be designed to be more lightweight, thin, short, convenient for assembly and low in cost.

[0003] In the prior art, the Bluetooth bone conduction headset has poor antenna signal reception and transmission quality and low sensitivity. Summary of the Utility Model

[0004] The utility model designs a 2.4GHZ built-in FPCB antenna and a Bluetooth bone conduction headset using the same, and the technical problems to be solved are that the existing 2.4GHZ built-in FPCB antenna has problems such as poor reception and transmission quality and low sensitivity.

[0005] In order to solve the above-mentioned existing technical problems, the utility model adopts the following scheme:

[0006] A 2.4GHZ built-in FPCB antenna includes a PI substrate, and is characterized in that: a first radiation unit and a second radiation unit separated from each other are provided on the PI substrate; the first radiation unit includes a downward arc portion, one end of the downward arc portion is provided with a step, a first feeding point is provided in the middle of the top of the downward arc portion, and the first feeding point is welded to the ground wire of the coaxial cable; the second radiation unit includes an upper hook portion, an upward arc portion and a lower step portion, one end of the upward arc portion is connected to the upper hook portion, the other end of the upward arc portion is connected to the lower step portion, a second feeding point is provided at the upper end of the lower step portion, and the second feeding point is welded to the core wire of the coaxial cable as the radiator of the antenna; the first feeding point is clamped between the step and the lower step portion and is directly below the second feeding point.

[0007] Preferably, the upper hook portion includes a first space, a second space is between the upper hook portion and the upward arc portion, a third space is between the lower step portion and the upward arc portion, and the first space, the second space and the third space are connected and communicated.

[0008] Preferably, the left end of the upper hook portion is directly above the right end of the lower step portion.

[0009] Preferably, the lower step portion includes a left lower horizontal portion, a middle vertical portion and a right upper horizontal portion, one side of the lower end of the middle vertical portion is connected to the left lower horizontal portion, the other side of the upper end of the middle vertical portion is connected to the right upper horizontal portion, and the right side surface of the right upper horizontal portion is connected to the second feeding point.

[0010] Preferably, both the first radiation unit and the second radiation unit are single-sided electrolytic copper foils.

[0011] Preferably, a black ink protection layer is covered on the PI substrate, the first radiation unit and the second radiation unit.

[0012] Preferably, both the first feeding point and the second feeding point are gold-plated.

[0013] Preferably, the PI substrate is circular.

[0014] A Bluetooth bone conduction headphone, characterized in that it includes the above-mentioned 2.4GHZ built-in FPCB antenna.

[0015] The 2.4GHZ built-in FPCB antenna and the Bluetooth bone conduction headphone using the same have the following beneficial effects:

[0016] The utility model not only has good reception and transmission quality and high sensitivity, but also has a simple structure, is easy to mass-produce, convenient to install, saves costs and improves communication quality. Description of the Drawings

[0017] Figure 1 is a schematic structural diagram of the 2.4GHZ built-in FPCB antenna of the utility model;

[0018] Figure 2 is an echo loss test diagram of the 2.4GHZ built-in FPCB antenna of the utility model;

[0019] Figure 3 is a Smith chart of the 2.4GHZ built-in FPCB antenna of the utility model;

[0020] Figure 4 is a voltage standing wave ratio schematic diagram of the 2.4GHZ built-in FPCB antenna of the utility model.

[0021] Description of the Reference Numerals:

[0022] 1 - First radiation unit; 11 - Step; 2 - Second radiation unit; 21 - Upper hook-shaped part; 211 - First space; 212 - Second space; 22 - Lower step part; 221 - Third space; 3 - First feeding point; 4 - Second feeding point; 5 - PI substrate. Detailed Embodiments

[0023] The following will further describe the present invention in conjunction with Figures 1 to 4 :

[0024] As Figure 1As shown in the figure, the present utility model provides a 2.4GHz built-in FPCB antenna, which includes a PI substrate 5. On the PI substrate 5, there are a separated first radiation unit 1 and a second radiation unit 2. The first radiation unit 1 includes a downward arc portion. One end of the downward arc portion is provided with a step 11. In the middle of the top of the downward arc portion, there is a first feeding point 3, and the first feeding point 3 is welded to the ground wire of the coaxial cable. The second radiation unit 2 includes an upper hook-shaped portion 21, an upward arc portion and a lower step portion 22. One end of the upward arc portion is connected to the upper hook-shaped portion 21, and the other end of the upward arc portion is connected to the lower step portion 22. At the upper end of the lower step portion 22, there is a second feeding point 4, and the second feeding point 4 is welded to the core wire of the coaxial cable as the radiator of the antenna. The first feeding point 3 is clamped between the step 11 and the lower step portion 22 and is located directly below the second feeding point 4.

[0025] As Figure 1 shown in the figure, the upper hook-shaped portion 21 includes a first space 211. Between the upper hook-shaped portion 21 and the upward arc portion is a second space 212. Between the lower step portion 22 and the upward arc portion is a third space 221. The first space 211, the second space 212 and the third space 221 are connected and communicated.

[0026] As Figure 1 shown in the figure, the left end of the upper hook-shaped portion 21 is directly above the right end of the lower step portion 22. The lower step portion 22 includes a lower left horizontal portion, a middle vertical portion and an upper right horizontal portion. One side of the lower end of the middle vertical portion is connected to the lower left horizontal portion, and the other side of the upper end of the middle vertical portion is connected to the upper right horizontal portion. The right side surface of the upper right horizontal portion is connected to the second feeding point 4.

[0027] As Figure 1 shown in the figure, both the first radiation unit 1 and the second radiation unit 2 are single-sided electrolytic copper foils. A black ink protection layer is covered on the PI substrate 5, the first radiation unit 1 and the second radiation unit 2. Both the first feeding point 3 and the second feeding point 4 are gold-plated. The PI substrate 5 is circular.

[0028] The antenna with the above structure has the following physical properties:

[0029] As Figure 2 shown in the figure, the return loss of the antenna of the present utility model at 2.4GHz is -16.166dB, which indicates that the antenna of the present utility model has a very good signal resonance at 2.4GHz and also has a good antenna bandwidth.

[0030] As Figure 3 shown in the figure, the Smith chart of the antenna of the present utility model. The upper half of the Smith chart is an inductive hemisphere, the lower half is a capacitive hemisphere, and the middle horizontal axis is a pure resistance. The ideal input impedance of the antenna is 50 ohms, that is, the center point of the circle. Figure 3The input impedance of the antenna of the present utility model at 2.4 GHz is 48.104 ohms, which is very close to the center point and approaches 50 ohms.

[0031] As Figure 4 shown, for the voltage standing wave ratio of the antenna of the present utility model, the closer the standing wave ratio is to 1, the better the signal transmission efficiency. In the figure, the voltage standing wave ratio of the antenna of the present utility model at 2.4 GHz is 1.3682, which is less than 1.5. Therefore, the antenna of the present utility model has good efficiency, good transmission quality and high receiving sensitivity.

[0032] The present utility model has been described exemplarily above in conjunction with the accompanying drawings. Obviously, the implementation of the present utility model is not limited by the above-mentioned manner. As long as various improvements are made by adopting the method concept and technical solution of the present utility model, or the concept and technical solution of the present utility model are directly applied to other occasions without improvement, they are all within the protection scope of the present utility model.

Claims

1. A 2.4 GHz internal FPCB antenna, comprising a PI substrate (5), characterized in that: A first radiation unit (1) and a second radiation unit (2) separated from each other are provided on the PI substrate (5); The first radiation unit (1) comprises a downward arc-shaped portion, one end of the downward arc-shaped portion is provided with a step (11), a first feeding point (3) is provided in the middle of the top of the downward arc-shaped portion, and the first feeding point (3) is welded to a ground wire of the coaxial line; The second radiation unit (2) comprises an upper hook-shaped portion (21), an upward arc-shaped portion and a lower step portion (22), one end of the upward arc-shaped portion is connected to the upper hook-shaped portion (21), the other end of the upward arc-shaped portion is connected to the lower step portion (22), and a second feeding point (4) is provided at the upper end of the lower step portion (22), and the core wire of the coaxial line is welded to the second feeding point (4) as a radiator of the antenna; The first feeding point (3) is clamped between the step (11) and the lower step portion (22), and is located directly below the second feeding point (4).

2. The 2.4 GHZ internal FPCB antenna according to claim 1, characterized in that: The upper hook-shaped portion (21) comprises a first space (211), a second space (212) is provided between the upper hook-shaped portion (21) and the upward arc-shaped portion, and a third space (221) is provided between the lower step portion (22) and the upward arc-shaped portion; the first space (211), the second space (212) and the third space (221) are connected.

3. The 2.4 GHZ internal FPCB antenna according to claim 2, characterized in that: The left end of the upper hook-shaped portion (21) is located directly above the right end of the lower step portion (22).

4. The 2.4 GHZ internal FPCB antenna according to claim 3, characterized in that: The lower step portion (22) comprises a lower left horizontal portion, a middle vertical portion and an upper right horizontal portion, one side of the lower end of the middle vertical portion is connected to the lower left horizontal portion, the other side of the upper end of the middle vertical portion is connected to the upper right horizontal portion, and the right side surface of the upper right horizontal portion is connected to the second feeding point (4).

5. The 2.4 GHz internal FPCB antenna according to any one of claims 1 to 4, characterized in that: The first radiation unit (1) and the second radiation unit (2) are both single-sided electrolytic copper foil.

6. The 2.4 GHz internal FPCB antenna according to any one of claims 1 to 4, characterized in that: The PI substrate (5), the first radiation unit (1) and the second radiation unit (2) are covered with a black ink protective layer.

7. The 2.4 GHz internal FPCB antenna according to any one of claims 1 to 4, characterized in that: The first feed point (3) and the second feed point (4) are both gold plated.

8. The 2.4 GHz internal FPCB antenna according to any one of claims 1 to 4, characterized in that: The PI substrate (5) is circular.

9. A Bluetooth bone conduction headset, characterized in that: The invention comprises the 2.4 GHZ built-in FPCB antenna as claimed in any one of claims 1 to 8.

Images