Onboard antenna structure and TWS device

Abstract

The utility model discloses an onboard antenna structure and TWS equipment. The onboard antenna structure comprises a mainboard body, an antenna body, a feed circuit and a grounding circuit, a clearance gap is formed between the mainboard body and the antenna body; the clearance gap comprises a feed clearance area parallel to the length direction of the antenna body and a clearance slot; the clearance gap is used for at least partially separating the main board body, so that the main board body is separated into a first main board and a second main board which are connected with each other, and the second main board and the antenna body are oppositely arranged; the feed circuit is connected with the input end of the antenna body, and the grounding circuit is connected with the grounding end of the antenna body and the second mainboard; wherein the body resonance formed by the antenna body is consistent with the coupling resonance formed by the antenna body and the second mainboard in frequency. Through the arrangement, the radiation performance of the antenna can be effectively improved under the same clearance area.

Description

TECHNICAL FIELD

[0001] The utility model relates to wireless communication field especially is related to a kind of onboard antenna structure and TWS device. BACKGROUND

[0002] In recent years, the truly wireless stereo (TWS) earphone product makes a rapid progress, to cater to the user experience of consumer end, the function of TWS earphone is increasing, and the space size is decreasing. As one of the important modules of TWS earphone, the design scheme of a high cost performance antenna is particularly important.

[0003] At present, the commonly used TWS earphone antenna has the following several forms: laser direct structuring technology antenna, flexible printed circuit (FPC) antenna, ceramic antenna, printed circuit board (PCB) onboard antenna. LDS antenna, FPC antenna and ceramic antenna, antenna is separate module material, increases the cost of TWS earphone. And PCB onboard antenna is directly etched on the antenna on the PCB of earphone mainboard, the antenna of this scheme does not introduce additional cost, and the performance is relatively high.

[0004] At present, with the layout of various devices around onboard antenna more and more compact, the clearance area is continuously squeezed, and the area is increasingly reduced. At the same time, the expectation of consumers for product performance increases day by day, and the market demand for antenna performance continues to rise, and the existing antenna design scheme has been difficult to meet the needs of current product design.

[0005] Therefore, an onboard antenna structure and TWS device are needed to solve the above problems. UTILITY MODEL CONTENT

[0006] The utility model aims at providing an onboard antenna structure and TWS device to effectively improve the radiation performance of the antenna under the same clearance area.

[0007] To solve the above technical problems, the utility model provides an onboard antenna structure, which comprises a main board body, an antenna body, a feeding circuit and a grounding circuit.

[0008] The main board body and the antenna body form a clearance gap therebetween.

[0009] The clearance gap comprises a feeding clearance area parallel to the length direction of the antenna body and a clearance gap.

[0010] The clearance is used for at least partially separating the main plate body, so that the main plate body is separated to form a first main plate and a second main plate which are connected to each other, and the second main plate is arranged opposite to the antenna body;

[0011] The feeding circuit is connected with an input end of the antenna body, and the grounding circuit is connected with a grounding end of the antenna body and the second main plate;

[0012] The body resonance formed by the antenna body is consistent with the coupling resonance formed by the antenna body and the second main plate in frequency.

[0013] Further, the clearance is arranged in an L-shaped structure.

[0014] Further, the clearance and the feeding clearance are vertically distributed on the surface of the main plate body.

[0015] Further, the width of the feeding clearance is 0.5mm-0.9mm, and the length of the feeding clearance is 6.3mm-6.7mm.

[0016] Further, the depth of the clearance is 3.0mm-3.4mm, and the width of the clearance is 0.8mm-1.2mm.

[0017] Further, the first main plate is provided with a plate-to-plate connector and a switch spring.

[0018] Further, the second main plate is provided with a microphone device and a charging interface.

[0019] Further, the feeding circuit comprises an F-shaped matching circuit and a pi-shaped matching circuit, so as to enhance the gain intensity of the antenna body.

[0020] The grounding circuit comprises a series capacitor, so as to change the impedance characteristic of the antenna body, and finely tune the resonance frequency and the working bandwidth of the antenna body.

[0021] Further, the antenna body is arranged as a loop antenna.

[0022] In another aspect, the utility model also provides a TWS device comprising the on-board antenna structure.

[0023] Compared with the prior art, the utility model has at least the following beneficial effects:

[0024] By setting the antenna body and the main plate body, and forming the clearance gap including the feeding clearance and the clearance gap between the antenna body and the main plate body, and enabling the clearance gap to separate the main plate body into the first main plate and the second main plate arranged opposite to the antenna body, and then under the connection of the feeding circuit and the grounding circuit, the antenna body and the antenna body and the second main plate can form the body resonance and the coupling resonance respectively, and by limiting the size of the clearance gap, the body resonance and the coupling resonance are kept consistent in frequency, so that the resonance bandwidth is increased, the function of increasing the effective radiation area of the antenna body is realized, and the purpose of improving the antenna radiation performance under the same clearance area is achieved. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 It is a structural schematic view of the on-board antenna structure in the embodiment of the utility model.

[0026] Corresponding reference signs in the drawings indicate corresponding parts throughout the several views of the drawings. The reference signs are only denoted by way of example, and there can be many identical parts which have not been denoted by reference signs. The size of the parts, the depicted relative sizes and / or proportions can not be to scale and are merely intended to illustrate the general principles of the utility model. Like reference numerals refer to like elements throughout. DETAILED DESCRIPTION

[0027] The on-board antenna structure and the TWS device of the utility model will be described in more detail below in conjunction with the schematic view, wherein the preferred embodiment of the utility model is represented, and it should be understood that the utility model described herein can be modified by those skilled in the art, and the advantageous effects of the utility model can still be achieved. Therefore, the following description should be understood as extensive knowledge for those skilled in the art, and not as a limitation on the utility model.

[0028] The utility model will be described in more detail in the following paragraphs with reference to the drawings. The advantages and features of the utility model will be more apparent according to the following description. It should be noted that the drawings are very simplified and all use non-precise proportions, and are only used to facilitate and clarify the purpose of assisting the description of the embodiment of the utility model.

[0029] Embodiment one

[0030] As shown in the drawings, the embodiment of the utility model provides an on-board antenna structure, which comprises a main plate body 1, an antenna body 2, a feeding circuit 3 and a grounding circuit 4. Figure 1

[0031] ​The clearance gap 5 is formed between the main plate body 1 and the antenna body 2, which is used to ensure the normal operation of the antenna body 2, and also used to separate the main plate body 1, so that part of the main plate body 1 can be coupled with the antenna body 2 to resonate, thereby expanding the effective radiation area of the antenna body 2, and improving the radiation performance of the antenna body 2 under the same clearance gap 5 (clearance area).

[0032] Specifically, the clearance gap 5 includes a feed clearance area 51 parallel to the length direction of the antenna body 2 and a clearance gap 52.

[0033] The clearance gap 52 is used to at least partially separate the main plate body 1, so that the main plate body 1 is separated to form a first main plate 11 and a second main plate 12 connected with each other, and the second main plate 12 is arranged opposite to the antenna body 2, so that the second main plate 12 and the antenna body 2 can form a coupled resonance under the action of the feed circuit 3 and the grounding circuit 4.

[0034] Specifically, because various electronic elements and circuits exist on the second main plate 12, an electric field will be generated when working, and the antenna body 2 will also have an electric field distribution when receiving or transmitting signals. Therefore, when the two are arranged opposite to each other, their electric fields can overlap and affect each other, so that the electric field energy can be transmitted and exchanged between the two, creating conditions for coupled resonance in the electric field.

[0035] In addition, a magnetic field will be generated when current passes through the antenna body 2, and a magnetic field will also be generated when the circuit on the second main plate 12 works. The opposite arrangement makes their magnetic fields able to couple with each other, just like the primary and secondary winding of a transformer. The interaction of the magnetic fields makes energy can be transmitted between the two through the magnetic field, promoting the occurrence of coupled resonance.

[0036] In the embodiment, the feed circuit 3 is connected with the input end of the antenna body 2, and the grounding circuit 4 is connected with the grounding end of the antenna body 2 and the second main plate 12, to provide a signal input channel and form a signal loop, and to provide conditions for the body resonance of the antenna body 2 and the coupled resonance of the antenna body 2 and the second main plate 12.

[0037] It should be particularly pointed out that the body resonance formed by the antenna body 2 and the coupled resonance formed by the antenna body 2 and the second main plate 12 are consistent in frequency.

[0038] Wherein, the frequency of the coupling resonance formed by the second main plate 12 and the antenna body 2 mainly depends on the size of the clearance gap 5, that is, by limiting the size of the clearance gap 5 when leaving the factory, the above-mentioned coupling resonance formed is ensured to be consistent with the body resonance formed by the antenna body 2, so as to achieve the purpose of improving the radiation performance of the antenna body 2.

[0039] The device is provided with the antenna body 2 and the main plate body 1, and the clearance gap 5 including the feed clearance 51 and the clearance gap 52 is formed between the antenna body 2 and the main plate body 1, and the clearance gap 52 can separate the main plate body 1 into the first main plate 11 and the second main plate 12 arranged opposite to the antenna body 2, and then under the connection of the feed circuit 3 and the grounding circuit 4, the antenna body 2 and the antenna body 2 and the second main plate 12 can form body resonance and coupling resonance respectively, and by limiting the size of the clearance gap 5, the body resonance and the coupling resonance are consistent in frequency, so as to make the resonance bandwidth larger, realize the function of increasing the effective radiation area of the antenna body 2, and achieve the purpose of improving the antenna radiation performance under the same clearance area.

[0040] In the embodiment, in order to further shorten the area occupied by the clearance gap 5 and reserve more space for the installation of other devices, the purpose of improving performance while further reducing the area occupied by the clearance area is achieved, so the clearance gap 5 is arranged as an L-shaped structure.

[0041] And the clearance gap 52 and the feed clearance 51 are vertically distributed on the surface of the main plate body 1.

[0042] In a specific example, taking the body resonance formed by the antenna body 2 as 2.4G as an example, in order to make the coupling resonance formed between the antenna body 2 and the second main plate 12 also 2.4G, so as to increase the effective radiation area of the antenna body 2, so that the original 2.4G frequency band efficiency is improved by 3db, and the purpose of improving the antenna radiation performance under the same clearance area is achieved, so the size of the clearance gap 5 is further limited.

[0043] Specifically, the width of the feed clearance 51 is 0.5mm-0.9mm, and the length of the feed clearance 51 is 6.3mm-6.7mm. Wherein, the depth (as shown by H1 in the figure) of the clearance gap 52 is 3.0mm-3.4mm, and the width (as shown by L1 in the figure) of the clearance gap 52 is 0.8mm-1.2mm. Figure 1 Figure 1

[0044] In other embodiments, the first main plate 11 is provided with a plate-to-plate connector 6 and a switch spring 7.​​

[0045] And, the second main board 12 is provided with a microphone device 8 and a charging interface 9.

[0046] In further embodiments, the feed circuit 3 and the grounding circuit 4 are further defined. Specifically, the feed circuit 3 includes an F-type matching circuit and a π-type matching circuit, for enhancing the gain intensity of the antenna body 2.

[0047] The F-type matching circuit can adjust the impedance of the feed point, so that the input impedance of the antenna body 2 is better matched with the output impedance of the feed circuit. Moreover, for a loop antenna, the F-type matching circuit can effectively reduce signal reflection, allowing more radio frequency energy to be transmitted to the antenna body 2, thereby improving the radiation efficiency of the antenna and enhancing the gain intensity.

[0048] In addition, the π-type matching circuit has more flexible impedance transformation capability and can achieve good impedance matching in a wider frequency range. For a loop antenna operating in the 2.4G frequency band, the π-type matching circuit can transform the impedance of the feed circuit 3 to a suitable value according to the actual impedance of the antenna and the operating frequency requirement, further improving the gain intensity of the antenna in this frequency band and reducing the loss in the signal transmission process.

[0049] Further, the π-type matching circuit can also have a filtering effect, which can suppress the harmonics that may be generated by the loop antenna. It can make the antenna more focused on signal radiation and reception at the operating frequency, avoiding interference with other frequency bands caused by harmonics, improving the purity of the signal and the stability of the system, and indirectly improving the performance of the antenna in the normal operating frequency band.

[0050] The grounding circuit 4 includes a series capacitor for changing the impedance characteristics of the antenna body 2 to fine-tune the resonant frequency and operating bandwidth of the antenna body 2.

[0051] The series capacitor, when connected to the grounding circuit 4, changes the overall impedance characteristics of the loop antenna. The capacitive reactance of the capacitor is related to the frequency, and at different frequencies it will have different effects on the impedance of the antenna. By selecting an appropriate series capacitor value, the input impedance of the antenna can be made to reach a more ideal value near the target operating frequency, achieving better matching effect and thus optimizing the radiation performance of the antenna.

[0052] In this embodiment, the antenna body 2 is configured as a loop antenna to better adapt to the feed circuit 3 and the grounding circuit 4.

[0053] Embodiment Two

[0054] The second embodiment further proposes a TWS device on the basis of the first embodiment, which comprises the on-board antenna structure described in the first embodiment, and achieves the purpose of improving the antenna radiation performance under the same clearance area.

[0055] Obviously, various modifications and variations of the present application can be made by those skilled in the art without departing from the spirit and scope of the present application. Thus, it is intended that the present application include modifications and variations of the present application coming within the scope of the claims and their equivalents.

Claims

1. An on-board antenna structure, characterized by, This includes the mainboard, antenna, power supply circuit, and grounding circuit. A clearance gap is formed between the motherboard body and the antenna body; The clearance gap includes a feed clearance area parallel to the length direction of the antenna body and a clearance slot; The clearance gap is used to at least partially divide the motherboard body, so that the motherboard body is divided into a first motherboard and a second motherboard that are connected to each other, and the second motherboard is arranged opposite to the antenna body; The power supply circuit is connected to the input terminal of the antenna body, and the grounding circuit is connected to the grounding terminal of the antenna body and the second main board. The resonance formed by the antenna body and the coupling resonance formed by the antenna body and the second motherboard are consistent in frequency.

2. The on-board antenna structure of claim 1, wherein, The clearance gap is designed as an L-shaped structure.

3. The on-board antenna structure of claim 1, wherein, The clearance gap and the power supply clearance area are vertically distributed on the surface of the motherboard body.

4. The on-board antenna structure of claim 1, wherein, The width of the power supply clearance area is 0.5mm-0.9mm, and the length of the power supply clearance area is 6.3mm-6.7mm.

5. The on-board antenna structure of claim 1, wherein, The depth of the clearance gap is 3.0mm-3.4mm, and the width of the clearance gap is 0.8mm-1.2mm.

6. The on-board antenna structure of claim 1, wherein, The first motherboard is equipped with board-to-board connectors and switch springs.

7. The on-board antenna structure of claim 1, wherein, The second motherboard is equipped with a microphone and a charging interface.

8. The on-board antenna structure of claim 1, wherein, The feeding circuit includes an F-type matching circuit and a π-type matching circuit, which are used to enhance the gain of the antenna body. The grounding circuit includes a series capacitor, which is used to change the impedance characteristics of the antenna body to fine-tune the resonant frequency and operating bandwidth of the antenna body.

9. The on-board antenna structure of claim 1, wherein, The antenna body is configured as a loop antenna.

10. A TWS device, comprising: Includes the onboard antenna structure as described in any one of claims 1-9.

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