A Bluetooth antenna and terminal

Abstract

The present invention discloses a Bluetooth antenna and terminal, including an antenna body, the antenna body is arranged on a printed circuit board, the antenna body includes a first sub-antenna body and a second sub-antenna body in a preset shape; the first sub-antenna body includes a first extension end extending on the printed circuit, a first connection end connected to the second sub-antenna body, and a matching portion extending in a predetermined direction; the matching portion is used to achieve 50 ohm impedance matching; the second sub-antenna body is connected to the first connection end and extends to a preset position in the direction of the first extension end. This embodiment directly uses the antenna body to achieve 50 ohm impedance matching, does not require external components, saves the ceramic antenna, and reduces costs.

Description

Technical Field

[0001] The present invention relates to the field of antenna technology, and in particular to a Bluetooth antenna and a terminal. Background Art

[0002] At present, Bluetooth technology has been widely used, especially in mobile phones, and has almost become a standard configuration. Bluetooth antennas are generally implemented as ceramic Bluetooth antennas, and there are also Bluetooth antennas made of metal sheets.

[0003] However, the Bluetooth antenna in the prior art is relatively expensive and its communication sensitivity cannot meet the usage requirements of current terminals. Summary of the invention

[0004] The embodiments of the present invention provide a Bluetooth antenna and a terminal, which are used to solve or at least partially solve the cost and sensitivity problems of Bluetooth antennas in the prior art.

[0005] An embodiment of the present invention provides a Bluetooth antenna, comprising an antenna body, wherein the antenna body is arranged on a printed circuit board, and the antenna body comprises a first sub-antenna body and a second sub-antenna body in a preset shape;

[0006] The first sub-antenna body comprises a first protruding end extending on the printed circuit, a first connecting end connected to the second sub-antenna body, and a matching portion extending in a predetermined direction;

[0007] The matching unit is used to achieve 50 ohm impedance matching;

[0008] The second sub-antenna body is connected to the first connecting end and extends toward the first extending end to a preset position.

[0009] In one implementation, the first sub-antenna body and the second sub-antenna body are both in an inverted "F" shape, and the area of ​​the second sub-antenna body is smaller than that of the first sub-antenna body.

[0010] In one embodiment, a ground plane is further disposed on the printed circuit, the second sub-antenna body is disposed adjacent to the ground plane, and the remaining area around the antenna body is a clear area.

[0011] In one embodiment, the ground plane is laid on the top layer of the printed circuit board.

[0012] In one embodiment, the antenna body is laid on a top layer of a printed circuit board.

[0013] In one embodiment, the antenna body is in a linear or sheet shape.

[0014] In one embodiment, the antenna body is integrally formed on the printed circuit board.

[0015] An embodiment of the present invention further provides a terminal, comprising the aforementioned Bluetooth antenna.

[0016] The embodiment of the present invention directly utilizes the antenna body to achieve 50 ohm impedance matching, does not require external components, saves the ceramic antenna, and reduces the cost.

[0017] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented according to the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Moreover, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0019] Figure 1 This is a schematic diagram of the structure of a Bluetooth antenna according to a first embodiment of the present invention;

[0020] Figure 2 This is a schematic diagram of the structure of a Bluetooth antenna according to a second embodiment of the present invention;

[0021] Figure 3 This is a schematic diagram of the radiation pattern of a Bluetooth antenna according to a second embodiment of the present invention;

[0022] Figure 4 , 5 FIG. 2 is a schematic diagram of vertical polarization of a Bluetooth antenna in the XY plane according to the second embodiment of the present invention. DETAILED DESCRIPTION

[0023] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0024] Embodiment 1

[0025] Bluetooth has always been a standard feature of smart devices, whether it is a smartphone, a laptop, or a tablet. With the development of mobile Internet, a large number of smart wearable devices have emerged. To support the development of these applications, not only mobile software support is needed, but also wireless sensor technology support is needed. Bluetooth is still the preferred communication method for wireless connection.

[0026] A first embodiment of the present invention provides a Bluetooth antenna, such as Figure 1 As shown, it includes an antenna body, the antenna body is arranged on a printed circuit board, and the antenna body includes a first sub-antenna body 1 and a second sub-antenna body 2 in a preset shape;

[0027] The first sub-antenna body 1 comprises a first protruding end extending on the printed circuit, a first connecting end connected to the second sub-antenna body, and a matching portion 3 extending in a predetermined direction;

[0028] The matching part 3 is used to achieve 50 ohm impedance matching;

[0029] The second sub-antenna body 2 is connected to the first connecting end, and extends toward the first extending end to a preset position.

[0030] Specifically, Figure 1 As shown, the Bluetooth antenna of this embodiment includes an integrally formed antenna body. For example, the antenna body can be integrally formed and drawn on the printed circuit board. The antenna body may include a first sub-antenna body 1 and a second sub-antenna body 2 in a preset shape. In this embodiment, the shapes of the first sub-antenna body 1 and the second sub-antenna body 2 may be the same or similar, and the specifications of the antenna may be different. Of course, the number of sub-antenna bodies included in the specific antenna body is not limited here, and can be set according to actual needs. In this embodiment, the antenna body includes a first sub-antenna body 1 and a second sub-antenna body 2 for illustration. The first sub-antenna body 1 includes a first protruding end extending on the printed circuit, a first connecting end connected to the second sub-antenna body, and a matching portion 3 extending in a predetermined direction. The first sub-antenna body 1 is connected to the second sub-antenna body 2 in a circuitous manner, for example Figure 1 In the embodiment, the second sub-antenna body 2 extends from the first connection end to the first extension end of the first sub-antenna body 1. In this embodiment, the matching portion 3 extending from the first sub-antenna body 1 can be used to set a 50 ohm feeding point to directly achieve 50 ohm impedance matching, thereby eliminating the need for external components, omitting the ceramic antenna, and reducing costs.

[0031] In one implementation, the first sub-antenna body 1 and the second sub-antenna body 2 are both in an inverted “F” shape, and the area of ​​the second sub-antenna body 2 is smaller than that of the first sub-antenna body 1 .

[0032] In this embodiment, the first sub-antenna body 1 and the second sub-antenna body 2 are both in an inverted "F" shape, and the second sub-antenna body 2 is smaller than the first sub-antenna body 1. The second sub-antenna body 2 extends from the first connecting end of the inverted F shape of the first sub-antenna body 1 to a predetermined position in the direction of the first extending end. Figure 1As shown, in this embodiment, the 50 ohm feeding point can extend in a predetermined direction from the second connection end of the first sub-antenna body 1. By providing two sub-antenna bodies of different sizes and using a circuitous arrangement, the volume occupied by the Bluetooth antenna is reduced.

[0033] In one embodiment, a ground plane 4 is further disposed on the printed circuit, the second sub-antenna body is disposed adjacent to the ground plane 4, and the remaining area around the antenna body is a clear area.

[0034] In this embodiment, a ground plane 4 is also provided on the printed circuit, the second sub-antenna body 2 is provided adjacent to the ground plane 4, and the remaining area around the first sub-antenna body 1 and the second sub-antenna body 2 is a clear area. Figure 1 As shown, for example, near the 50 ohm feeding point of the matching part 3, a corresponding clearance area needs to be provided on the ground plane 4 to ensure that the remaining area around the first sub-antenna body 1 and the second sub-antenna body 2 is not provided with a ground plane.

[0035] In one embodiment, the ground plane 4 is laid on the top layer of the printed circuit board, and the antenna body is laid on the top layer of the printed circuit board 4. The ground plane 4 and the antenna body are both laid on the top layer of the printed circuit board 4 to ensure the performance.

[0036] In one embodiment, the antenna body is linear or sheet-shaped. In specific applications, the antenna body of the inverted "F"-shaped antenna can be linear or sheet-shaped. When an insulating material with a higher dielectric constant is used, the size of the Bluetooth antenna can be further compressed, thereby reducing the volume occupied by the Bluetooth antenna.

[0037] In summary, the antenna body of the Bluetooth antenna of the present invention adopts an integrated design, and the antenna body itself is used to implement 50 ohm feeding, thereby eliminating the expensive ceramic antenna and saving costs.

[0038] Embodiment 2

[0039] A second embodiment of the present invention provides a Bluetooth antenna, such as Figure 2 As shown, it includes an antenna body, the antenna body is arranged on a printed circuit board, and the antenna body includes a first sub-antenna body 1 and a second sub-antenna body 2 in a preset shape;

[0040] The first sub-antenna body 1 comprises a first protruding end extending on the printed circuit, a first connecting end connected to the second sub-antenna body, and a matching portion 3 extending in a predetermined direction;

[0041] The matching part 3 is used to achieve 50 ohm impedance matching;

[0042] The second sub-antenna body 2 is connected to the first connecting end, and extends toward the first extending end to a preset position.

[0043] In this embodiment, the first sub-antenna body 1 and the second sub-antenna body 2 are both in an inverted "F" shape, and the area of ​​the second sub-antenna body 2 is smaller than that of the first sub-antenna body 1. In this embodiment, the first sub-antenna body 1 and the second sub-antenna body 2 are arranged in a circuitous manner. In this embodiment, the antenna body is generally placed on the top layer of the PCB, and the ground plane is generally placed on the top layer and near the antenna, but no ground plane is placed anywhere else around the antenna body, and the surrounding area should be a clear area, such as Figure 2 shown.

[0044] As an optional antenna structure, it is shown in Table 1.

[0045] Table 1 Bluetooth antenna structural parameters

[0046] H1 5.70mm W2 0.46mm H2 0.74mm L1 25.58mm H3 1.29mm L2 16.40mm H4 2.21mm L3 2.18mm H5 0.66mm L4 4.80mm H6 1.21mm L5 1.00mm H7 0.80mm L6 1.00mm H8 1.80mm L7 3.20mm H9 0.61mm L8 0.45mm W1 1.21mm

[0047] The relationship between the antenna and the radiation direction in this embodiment is shown in the figure Figure 3 As shown, since there is no ground plane under the PCB board corresponding to the antenna body, the PCB thickness has little effect on the performance of the Bluetooth antenna.

[0048] Further Figure 4 , Figure 5 The vertical polarization diagram of the inverted F Bluetooth antenna in the XY plane of this embodiment is shown. It can be concluded that in this embodiment, the inverted F Bluetooth antenna reflects less than 10% of the available power and the bandwidth exceeds 280MHz. Due to the presence of plastic packaging or other objects near the antenna body, the large bandwidth makes the Bluetooth antenna less sensitive to fine-tuning. The specific antenna performance is shown in Table 2.

[0049] Table 2 Bluetooth antenna performance table

[0050] Gain in XY plane 1.1dBi Reflection(Return Loss) <-15dB Antenna Size 25.7x 7.5mm

[0051] The printed circuit board (PCB) Bluetooth antenna of the embodiment of the present invention can be used for all 2.4GHz BT transceivers and transmitters of the Bluetooth chip Soc. The measured gain is 1.1dBi, and the antenna of the present invention is small in size, low in cost, and good in performance. At the same time, the impedance of the inverted F antenna is directly matched to 50 ohms, so no external matching components are required. At the same time, it is directly drawn on the PCB board, eliminating the expensive ceramic antenna and saving costs.

[0052] An embodiment of the present invention further provides a terminal, comprising the aforementioned Bluetooth antenna.

[0053] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0054] The serial numbers of the above embodiments of the present invention are only for description and do not represent the advantages or disadvantages of the embodiments.

[0055] The embodiments of the present invention are described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned specific implementation modes, which are merely illustrative rather than restrictive. Under the guidance of the present invention, ordinary technicians in this field can also make many forms without departing from the scope of protection of the present invention and the claims, all of which are within the protection of the present invention.

Claims

1. A Bluetooth antenna, characterized in that: The antenna body comprises an antenna body, wherein the antenna body is arranged on a printed circuit board, and the antenna body comprises a first sub-antenna body and a second sub-antenna body in a preset shape; The first sub-antenna body comprises a first protruding end extending on the printed circuit, a first connecting end connected to the second sub-antenna body, and a matching portion extending in a predetermined direction; The matching unit is used to achieve 50 ohm impedance matching; The second sub-antenna body is connected to the first connecting end and extends to a preset position in the direction of the first extending end; The first sub-antenna body and the second sub-antenna body are both in an inverted "F" shape, and the area of ​​the second sub-antenna body is smaller than the area of ​​the first sub-antenna body; A ground plane is also arranged on the printed circuit, the second sub-antenna body is arranged adjacent to the ground plane, and the remaining area around the antenna body is a clear area.

2. The Bluetooth antenna according to claim 1, characterized in that: The ground plane is laid on the top layer of the printed circuit board.

3. The Bluetooth antenna according to claim 1 or 2, characterized in that: The antenna body is laid on the top layer of the printed circuit board.

4. The Bluetooth antenna according to claim 1 or 2, characterized in that: The antenna body is in a linear or sheet shape.

5. The Bluetooth antenna according to claim 1 or 2, characterized in that: The antenna body is integrally formed and drawn on the printed circuit board.

6. A terminal, characterized in that: Comprising the Bluetooth antenna as described in any one of claims 1-5.

Images