Antenna, circuit board and Bluetooth adapter thereof

Abstract

The utility model relates to the technical field of antennas, in particular to an antenna, a circuit board and a Bluetooth adapter thereof. The antenna comprises a signal radiation main body, a grounding pin and a radio frequency signal pin. The grounding pin is connected with one end of the signal radiation main body, and the radio frequency signal pin is connected with the signal radiation main body and located beside the grounding pin at an interval; the grounding pin is used for connecting a GND of a circuit board, and the radio frequency signal pin is used for connecting a radio frequency signal feed-in point of the circuit board. And on the signal radiation main body, the length L1 from one end far away from the grounding pin to the connection position of the radio frequency signal pin is 10-15mm. According to the antenna provided by the utility model, the length L1 of the connection position from one end, far away from the grounding pin, of the signal radiation main body to the radio frequency signal pin is set to be 10-15mm, so that the resonant frequency and the input impedance of the antenna are obviously optimized, the antenna is more adaptive to a Bluetooth adapter, the signal quality of the Bluetooth adapter is improved, the reflection loss is small, and the efficiency is high.

Description

Technical Field

[0001] The utility model relates to the technical field of antennas, in particular to an antenna, a circuit board and a Bluetooth adapter thereof. Background Art

[0002] A Bluetooth adapter is a device that can add Bluetooth functionality to a device. It can be connected to the input / output ports (such as USB, RS232, PCMCIA, etc.) of various devices to provide Bluetooth connectivity, allowing these devices to communicate wirelessly with other Bluetooth devices.

[0003] Currently, most Bluetooth adapters on the market, such as car Bluetooth adapters, use conventional inverted F antennas (PIFA antennas). This antenna has the advantages of strong anti-interference performance and low cost. However, since conventional antennas are generally used as references, their design size is small and the antenna performance is poor. As a result, when users use it, if the mobile communication device is a little distance away from the Bluetooth adapter or rotated to certain angles, the transmission will be stuck or even disconnected. Utility Model Content

[0004] The embodiment of the utility model provides an antenna, a circuit board and a Bluetooth adapter thereof to solve the problem in the prior art that the conventional antenna design is small in size and has poor antenna performance, so that when the user uses the mobile communication device, the Bluetooth adapter is moved away from the mobile communication device or rotated to certain angles, which will cause transmission jams or even disconnection.

[0005] The utility model discloses an antenna, which comprises a signal radiation body, a ground pin and a radio frequency signal pin;

[0006] The ground pin is connected to one end of the signal radiating body, and the RF signal pin is connected to the signal radiating body and is spaced beside the ground pin; the ground pin is used to connect to the GND of the circuit board, and the RF signal pin is used to connect to the RF signal feeding point of the circuit board;

[0007] Wherein, on the signal radiating body, the length L1 from the end away from the ground pin to the connection position of the RF signal pin is 10-15 mm.

[0008] Optionally, a width W1 of the ground pin is 3-5 mm, and / or a distance D1 between the ground pin and the radio frequency signal pin is 1-2 mm.

[0009] Optionally, the length L2 of the RF signal pin is 4-6 mm.

[0010] Optionally, the width W2 of the RF signal pin is 1-1.5 mm.

[0011] Optionally, the length L1 is 11 mm or 12.5 mm; and / or

[0012] The width W1 of the ground pin is 3.5 mm or 4.3 mm; and / or

[0013] The distance D1 between the ground pin and the RF signal pin is 1.4 mm or 1.6 mm; and / or

[0014] The length L2 of the RF signal pin is 4.5 mm or 5 mm; and / or

[0015] The width W2 of the RF signal pin is 1.2 mm or 1.4 mm.

[0016] Optionally, a first positioning groove is provided on a side of the signal radiating body away from the radio frequency signal pin; and / or

[0017] On the signal radiating body, one end connected to the ground pin is provided with a chamfered edge, and the chamfered edge extends from a side away from the radio frequency signal pin to a side of the ground pin away from the radio frequency signal pin.

[0018] Optionally, a second positioning groove is formed on a side of the signal radiating body away from the radio frequency signal pin.

[0019] Optionally, the width W3 of the first positioning groove is 0.2-1 mm, and the width W4 of the second positioning groove is 3-5 mm.

[0020] The utility model also discloses an antenna, which includes a signal radiation body, a ground pin and a radio frequency signal pin;

[0021] The ground pin is connected to one end of the signal radiating body, and the RF signal pin is connected to the signal radiating body and is spaced beside the ground pin; the ground pin is used to connect to the GND of the circuit board, and the RF signal pin is used to connect to the RF signal feeding point of the circuit board;

[0022] Among them, on the signal radiating body, the length L1 from the end away from the ground pin to the connection position of the RF signal pin is 11mm or 12.5mm, the width W1 of the ground pin is 3-5mm, the spacing D1 between the ground pin and the RF signal pin is 1-2mm, the length L2 of the RF signal pin is 4-6mm, and the width W2 of the RF signal pin is 1-1.5mm; or

[0023] On the signal radiating body, the length L1 from the end away from the ground pin to the connection position of the RF signal pin is 10 to 15 mm, the width W1 of the ground pin is 3.5 mm or 4.3 mm, the spacing D1 between the ground pin and the RF signal pin is 1 to 2 mm, the length L2 of the RF signal pin is 4 to 6 mm, and the width W2 of the RF signal pin is 1 to 1.5 mm; or

[0024] On the signal radiating body, the length L1 from the end away from the ground pin to the connection position of the RF signal pin is 10 to 15 mm, the width W1 of the ground pin is 3 to 5 mm, the spacing D1 between the ground pin and the RF signal pin is 1.4 mm or 1.6 mm, the length L2 of the RF signal pin is 4 to 6 mm, and the width W2 of the RF signal pin is 1 to 1.5 mm; or

[0025] On the signal radiating body, the length L1 from the end away from the ground pin to the connection position of the RF signal pin is 10 to 15 mm, the width W1 of the ground pin is 3 to 5 mm, the spacing D1 between the ground pin and the RF signal pin is 1 to 2 mm, the length L2 of the RF signal pin is 4.5 mm or 5 mm, and the width W2 of the RF signal pin is 1 to 1.5 mm;

[0026] On the signal radiating body, the length L1 from the end away from the ground pin to the connection position of the RF signal pin is 10 to 15 mm, the width W1 of the ground pin is 3 to 5 mm, the distance D1 between the ground pin and the RF signal pin is 1 to 2 mm, the length L2 of the RF signal pin is 4 to 6 mm, and the width W2 of the RF signal pin is 1.4 mm or 1.2 mm.

[0027] The utility model also discloses a circuit board, comprising a board body and the above antenna; the antenna is arranged at the clearance area of ​​the board body or at the maximum clearance area of ​​the board body.

[0028] The utility model also discloses a Bluetooth adapter, which comprises the above antenna or the above circuit board.

[0029] Compared with the prior art, the beneficial effect of the antenna provided by the embodiment of the utility model is that the antenna of the utility model sets the length L1 of the connection position from the end of the signal radiating body away from the ground pin to the RF signal pin to 10-15mm. The part of the connection position from the end of the signal radiating body away from the ground pin to the RF signal pin is the resonant length of the antenna, and the change of the resonant length has the most direct impact on the resonant frequency and input impedance of the antenna. Setting the length L1 to 10-15mm can increase the signal radiating body, significantly optimize the resonant frequency and input impedance of the antenna, make it more suitable for the Bluetooth adapter, improve the signal quality of the Bluetooth adapter, reduce reflection loss, and increase efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The technical solution of the utility model will be further described in detail below with reference to the accompanying drawings and embodiments, in which:

[0031] Figure 1 It is a simplified schematic diagram of a conventional inverted-F antenna;

[0032] Figure 2This is the directional pattern of a conventional inverted-F antenna;

[0033] Figure 3 is a schematic diagram of an antenna according to an embodiment of the utility model;

[0034] Figure 4 It is a schematic diagram of an antenna and a circuit board according to an embodiment of the utility model;

[0035] Figure 5 It is the directional diagram of the antenna of the embodiment of the utility model.

[0036] The reference numerals in the figures are:

[0037] 1. Antenna; 11. Signal radiating body; 111. First positioning groove; 112. Second positioning groove; 12. Ground pin; 13. RF signal pin; 14. Bevel edge; 2. Circuit board; 21. Board body; 3. Conventional inverted F antenna. DETAILED DESCRIPTION

[0038] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. Now, in conjunction with the accompanying drawings, a preferred embodiment of the present utility model is described in detail.

[0039] Currently, most Bluetooth adapters on the market, such as car Bluetooth adapters, use conventional inverted F antennas 3 (PIFA antenna Planar Inverted F-shaped Antenna), which has the advantages of strong anti-interference performance and low cost. However, since this is a conventional antenna generally used as a reference, its design size is small, the antenna form and routing are fixed, and the antenna layout lacks flexibility. When used on car Bluetooth receiver products, there is a waste of antenna clearance area, so that the antenna performance cannot reach the best state. As a result, when the user uses it, the mobile communication device, such as a mobile phone, is a little distance away from the Bluetooth adapter, or rotated to certain specific angles, the transmission will be stuck or even disconnected.

[0040] Combination Figure 1 and Figure 2 As shown, Figure 1 The conventional inverted-F antenna 3 is shown. Figure 2 for Figure 1 Antenna directional pattern. The antenna performance of this antenna product is low, resulting in a weak signal for the entire device. For example, the signal strength at angle 1 of the directional pattern is -18.5dBm, and the signal strength at angle 2 is -17.8dBm. These two angles are signal blind spots for this conventional inverted F antenna product. These two signal blind spots cause transmission jams or disconnection when the mobile communication device, such as a mobile phone, is slightly more than 3 meters away from the Bluetooth adapter.

[0041] In this regard, the present utility model embodiment provides an antenna 1, such as Figure 3 As shown, the antenna 1 includes a signal radiating body 11, a ground pin 12 and a radio frequency signal pin 13. The ground pin 12 is connected to one end of the signal radiating body 11, and the radio frequency signal pin 13 is connected to the signal radiating body 11 and is spaced apart beside the ground pin 12; the ground pin 12 is used to connect to the GND of the circuit board 2, and the radio frequency signal pin 13 is used to connect to the radio frequency signal feeding point of the circuit board 2. Among them, on the signal radiating body 11, the length L1 from the end away from the ground pin 12 to the connection position of the radio frequency signal pin 13 is 10 to 15 mm.

[0042] The antenna 1 of the utility model sets the length L1 of the signal radiating body 11 from the end away from the ground pin 12 to the connection position of the RF signal pin 13 to 10-15 mm. The portion of the signal radiating body 11 from the end away from the ground pin 12 to the connection position of the RF signal pin 13 is the resonant length of the antenna 1, and the change of the resonant length has the most direct impact on the resonant frequency and input impedance of the antenna 1. Setting the length L1 to 10-15 mm can increase the signal radiating body 11, significantly optimize the resonant frequency and input impedance of the antenna 1, make it more suitable for the Bluetooth adapter, improve the signal quality of the Bluetooth adapter, reduce reflection loss, and increase efficiency.

[0043] In specific applications, the antenna 1 of the utility model can be applied to a Bluetooth adapter, especially a car-mounted Bluetooth adapter, adapted to Bluetooth in the frequency band of 2402MHz to 2483MHz. The length L1 can be any one of 10mm, 10.5mm, 11mm, 11.5mm, 12mm, 12.5mm, 13mm, 13.5mm, 14mm, 14.5mm, and 15mm. The wavelength λ is calculated according to the speed of light formula C=λf. The antenna 1 of the utility model is a dipole antenna 1, and the line length L of the antenna 1 is 1 / 4λ. Combined with the material of the circuit board 2 carrying the antenna 1, the clearance area and other factors, the length L1 of the antenna 1 of the utility model is specifically 11mm or 12.5mm.

[0044] The signal radiating body 11 is the main part of the signal radiation. The ground pin 12 is used to connect the GND of the circuit board 2 to form a loop between the antenna 1 and the ground (GND) of the circuit board 2. The RF signal pin 13 is the feeding point of the RF signal (Radio Frequency Signal, RF signal), and the RF signal pin 13 can be connected to the circuit board 2 through the welding hole of the circuit board 2. The antenna 1 is a metal antenna 1.

[0045] Furthermore, the width W1 of the ground pin 12 is 3 to 5 mm. The ground pin 12 is the ground point GND, which is the location where the antenna 1 trace and the circuit board 2 ground are connected. In this solution, the width W1 of the ground pin 12 is set to 3 to 5 mm, and the grounding point increases the ground pin 12 to a specific size, which can be optimized. Figure 2 The problem of poor signal at the angle 1 shown is solved. Specifically, the width W1 of the ground pin 12 can be any one of 3 mm, 3.5 mm, 4 mm, 4.5 mm, and 5 mm. Specifically, the width W1 of the ground pin 12 is 3.5 mm or 4.3 mm.

[0046] The spacing D1 between the ground pin 12 and the RF signal pin 13 is 1 to 2 mm. The spacing D1 is the distance between the ground pin 12 and the RF signal pin 13. When D1 increases, the resonant frequency increases and the input impedance decreases; when D1 decreases, the resonant frequency decreases and the input impedance increases. This solution sets the spacing D1 between the ground pin 12 and the RF signal pin 13 between 1 and 2 mm, which can optimize the resonant frequency and input impedance. Specifically, the spacing D1 between the ground pin 12 and the RF signal pin 13 can be any one of 1.0 mm, 1.2 mm, 1.4 mm, 1.6 mm, 1.8 mm, and 2.0 mm. Specifically, the spacing D1 between the ground pin 12 and the RF signal pin 13 is 1.4 mm or 1.6 mm.

[0047] Furthermore, the length L2 of the RF signal pin 13 is 4 to 6 mm. The length L2 is the distance from the antenna 1 to the ground of the circuit board 2, that is, the height H of the antenna 1 is L2. The general rule of H is that when H increases, the resonant frequency decreases and the input impedance increases. When H decreases, the resonant frequency increases and the input impedance decreases. This solution sets the length L2 of the RF signal pin 13 to 4 to 6 mm, which can optimize the resonant frequency and input impedance. Specifically, the length L2 of the RF signal pin 13 can be any one of 4.0 mm, 4.5 mm, 5.0 mm, 5.5 mm, and 6.0 mm. Specifically, the length L2 of the RF signal pin 13 is 4.5 mm or 5 mm.

[0048] Furthermore, the width W2 of the RF signal pin 13 is 1 to 1.5 mm. Setting the width W2 of the RF signal pin 13 to 1 to 1.5 mm can optimize the input impedance, improve the energy transmission efficiency, optimize the bandwidth of the antenna 1, improve the effective energy transmission of the antenna 1 in a wider frequency range, and optimize the gain of the antenna 1. Specifically, the width W2 of the RF signal pin 13 can be any one of 1.0 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, and 1.5 mm. Specifically, the width W2 of the RF signal pin 13 is 1.2 mm or 1.4 mm.

[0049] A first positioning groove 111 is provided on the side of the signal radiating body 11 away from the RF signal pin 13. Further, a second positioning groove 112 is provided on the side of the signal radiating body 11 away from the RF signal pin 13. The first positioning groove 111 and the second positioning groove 112 are arranged correspondingly to the grooves at corresponding positions on the circuit board 2. Specifically, the width W3 of the first positioning groove 111 is 0.2 to 1 mm, for example, it can be any one of 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, and 1.0 mm. The first positioning groove 111 and the second positioning groove 112 play a positioning role. Preferably, the width W3 of the first positioning groove 111 is 0.5 mm. The width W4 of the second positioning groove 112 is 3-5 mm, for example, any one of 3.0 mm, 3.2 mm, 3.4 mm, 3.6 mm, 3.8 mm, 4.0 mm, 4.2 mm, 4.4 mm, 4.6 mm, 4.8 mm, and 5.0 mm. On the signal radiating body 11, a chamfered edge 14 is provided at one end connected to the ground pin 12, and the chamfered edge 14 extends from a side away from the RF signal pin 13 to a side of the ground pin 12 away from the RF signal pin 13. The chamfered edge 14 is adapted to the board body 21 of the circuit board 2.

[0050] like Figure 4 As shown, the utility model also discloses a circuit board 2, including a board body 21 and the above-mentioned antenna 1, and the antenna 1 is arranged at the clearance area of ​​the board body 21. Specifically, the antenna 1 is arranged at the maximum clearance area of ​​the board body 21. Since the circuit board 2 includes the above-mentioned antenna 1, it also has the same technical effect as the antenna 1, which will not be repeated here. The circuit board 2 of the utility model designs the routing of the antenna 1 according to the actual clearance area, and can adjust the performance of the antenna 1 to a better state without increasing the cost, thereby solving the problem of transmission jamming or transmission disconnection caused by poor signal.

[0051] The clearance area refers to the open area within the vertical projection area of ​​the antenna 1 on the circuit board 2 (both the upper and lower sides should be considered). Do not lay the ground within the projection area of ​​the antenna 1 (especially the onboard antenna 1) to maintain the clearance of the antenna 1 to improve the radiation efficiency of the antenna 1.

[0052] The utility model also discloses a Bluetooth adapter, comprising the above-mentioned antenna 1, or the above-mentioned circuit board 2. The Bluetooth adapter can be a vehicle-mounted Bluetooth adapter. Since the Bluetooth adapter has the above-mentioned circuit board 2 or antenna 1, it also has the same technical effects as the circuit board 2 or antenna 1, which will not be described in detail here.

[0053] For the antenna 1 of the present invention, the antenna 1 of the present invention is designed according to the shape of the edge of the circuit board 2. The line width of the conventional inverted 3F antenna 3 is wider, and the radiation area of ​​the antenna 1 is larger. The utility model increases the width of the grounding point GND to adjust the radiation pattern to be more complete, reduce the dead angle of signal radiation, and better exert the ability of the antenna 1 to radiate signals.

[0054] The antenna 1 of the utility model has a widened routing, which can significantly optimize the radiation pattern of the signal. Figure 5 As shown, the signal strength at angle 3 is -6.3dBm, and the signal strength at angle 4 is -4.6dBm. Figure 2 The signal strength of angle 1 and angle 2 of the conventional inverted 3F antenna 3 is at least 10dB greater. The measured pull distance at the same angle shows that the product using the antenna 1 of the utility model is 7-8 meters farther than the conventional inverted 3F antenna 3, and the anti-interference ability has been significantly improved, which fully meets the user's use needs.

[0055] It should be understood that the above embodiments are only used to illustrate the technical solutions of the present utility model rather than to limit it. For those skilled in the art, the technical solutions described in the above embodiments can be modified, or some of the technical features therein can be replaced by equivalents; and all these modifications and replacements should fall within the scope of protection of the claims attached to the present utility model.

Claims

1. An antenna, characterized in that: The antenna comprises a signal radiating body, a ground pin and a radio frequency signal pin; The ground pin is connected to one end of the signal radiating body, and the RF signal pin is connected to the signal radiating body and is spaced apart and located beside the ground pin; the ground pin is used to connect to the GND of the circuit board, and the RF signal pin is used to connect to the RF signal feeding point of the circuit board; Wherein, on the signal radiating body, a length L1 from an end away from the ground pin to a connection position of the RF signal pin is 10-15 mm.

2. The antenna according to claim 1, characterized in that The width W1 of the ground pin is 3-5 mm, and / or The distance D1 between the ground pin and the RF signal pin is 1-2 mm.

3. The antenna according to claim 1 or 2, characterized in that: The length L2 of the radio frequency signal pin is 4-6 mm.

4. The antenna according to claim 3, characterized in that: The width W2 of the radio frequency signal pin is 1-1.5 mm.

5. The antenna according to claim 1 or 2, characterized in that: The length L1 is 11 mm or 12.5 mm; and / or The width W1 of the ground pin is 3.5 mm or 4.3 mm; and / or The distance D1 between the ground pin and the RF signal pin is 1.4 mm or 1.6 mm; and / or The length L2 of the RF signal pin is 4.5 mm or 5 mm; and / or The width W2 of the RF signal pin is 1.2 mm or 1.4 mm.

6. The antenna according to claim 1 or 2, characterized in that: A first positioning groove is formed on a side of the signal radiating body away from the radio frequency signal pin; and / or On the signal radiating body, a chamfered edge is arranged at one end connected to the ground pin, and the chamfered edge extends from a side away from the RF signal pin to a side of the ground pin away from the RF signal pin.

7. The antenna according to claim 6, characterized in that A second positioning groove is formed on a side of the signal radiating body away from the radio frequency signal pin.

8. The antenna according to claim 7, characterized in that: The width W3 of the first positioning groove is 0.2-1 mm, and the width W4 of the second positioning groove is 3-5 mm.

9. An antenna, characterized in that: The antenna comprises a signal radiating body, a ground pin and a radio frequency signal pin; The ground pin is connected to one end of the signal radiating body, and the RF signal pin is connected to the signal radiating body and is spaced apart and located beside the ground pin; the ground pin is used to connect to the GND of the circuit board, and the RF signal pin is used to connect to the RF signal feeding point of the circuit board; Wherein, on the signal radiating body, the length L1 from one end away from the ground pin to the connection position of the RF signal pin is 11 mm or 12.5 mm, the width W1 of the ground pin is 3 to 5 mm, the distance D1 between the ground pin and the RF signal pin is 1 to 2 mm, the length L2 of the RF signal pin is 4 to 6 mm, and the width W2 of the RF signal pin is 1 to 1.5 mm; or On the signal radiating body, the length L1 from one end away from the ground pin to the connection position of the RF signal pin is 10-15 mm, the width W1 of the ground pin is 3.5 mm or 4.3 mm, the spacing D1 between the ground pin and the RF signal pin is 1-2 mm, the length L2 of the RF signal pin is 4-6 mm, and the width W2 of the RF signal pin is 1-1.5 mm; or On the signal radiating body, the length L1 from one end away from the ground pin to the connection position of the RF signal pin is 10-15 mm, the width W1 of the ground pin is 3-5 mm, the distance D1 between the ground pin and the RF signal pin is 1.4 mm or 1.6 mm, the length L2 of the RF signal pin is 4-6 mm, and the width W2 of the RF signal pin is 1-1.5 mm; or On the signal radiating body, the length L1 from one end away from the ground pin to the connection position of the RF signal pin is 10-15 mm, the width W1 of the ground pin is 3-5 mm, the distance D1 between the ground pin and the RF signal pin is 1-2 mm, the length L2 of the RF signal pin is 4.5 mm or 5 mm, and the width W2 of the RF signal pin is 1-1.5 mm; On the signal radiating body, the length L1 from one end away from the ground pin to the connection position of the RF signal pin is 10 to 15 mm, the width W1 of the ground pin is 3 to 5 mm, the distance D1 between the ground pin and the RF signal pin is 1 to 2 mm, the length L2 of the RF signal pin is 4 to 6 mm, and the width W2 of the RF signal pin is 1.4 mm or 1.2 mm.

10. A circuit board, characterized in that: It comprises a board body and the antenna according to any one of claims 1 to 8 or claim 9; the antenna is arranged at a clearance area of ​​the board body or the antenna is arranged at a maximum clearance area of ​​the board body.

11. A Bluetooth adapter, characterized in that: It comprises the antenna according to any one of claims 1 to 8 or claim 9, or the circuit board according to claim 10.

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