Antenna and audio device

Abstract

The application relates to an antenna and an audio device, which project in a direction perpendicular to a mainboard plane to define a main antenna projection area, a ground wire projection area and a mainboard projection area respectively, at least part of the main antenna projection area is configured to be outside the mainboard projection area, at least part of the ground wire projection area is configured to be outside the mainboard projection area, and the interference of the mainboard on the antenna is reduced. The first end of an extension ground wire and the first end of a main antenna, and the second end of the extension ground wire and the second end of the main antenna are coupled and connected respectively, that is, the main antenna and the extension ground wire are connected in a bidirectional coupling mode. Part or all of the antenna wiring is configured outside the mainboard projection area, the antenna is reconstructed in a double-coupled antenna design mode, a plurality of antenna resonance modes can be realized, the antenna has the advantages of small signal reflection and balanced radiation direction, the external radiation efficiency of the antenna can be improved, and the wireless data transmission scene requirements under the conditions of long distance and through a wall can be fully met.

Description

Technical Field

[0001] This application relates to the field of antenna technology, and in particular to an antenna and audio device. Background Technology

[0002] With the rapid development of science and technology, various electronic devices are being used more and more widely in people's daily lives, and antennas, as the core device for converting electromagnetic waves into circuit energy, are widely used in various electronic devices.

[0003] However, as people's demand for miniaturized products increases, the space for antenna placement becomes increasingly limited, and antenna design becomes more difficult, resulting in lower antenna radiation efficiency and difficulty in meeting user needs. Utility Model Content

[0004] Therefore, it is necessary to provide an antenna and audio device to improve the antenna's external radiation efficiency.

[0005] This application provides an antenna, including a main antenna, an extended ground wire, a feed spring, and a first ground spring. At least a portion of the main antenna projection area is located outside the motherboard projection area. The main antenna projection area is a region formed by projecting the main antenna along a direction perpendicular to the motherboard plane, and the motherboard projection area is a region formed by projecting the motherboard along a direction perpendicular to the motherboard plane. The motherboard plane is the surface of the motherboard used for integrating electronic devices. The feed spring connects the main antenna and the motherboard. At least a portion of the ground wire projection area is located outside the motherboard projection area. A first end of the extended ground wire is coupled to a first end of the main antenna, and a second end of the extended ground wire is coupled to a second end of the main antenna. The ground wire projection area is a region formed by projecting the extended ground wire along a direction perpendicular to the motherboard plane. The first ground spring connects the extended ground wire and the motherboard.

[0006] This application also provides an audio device, including a motherboard, a battery, a microphone, and the antenna described above, wherein the motherboard and the microphone are respectively connected to the battery.

[0007] The aforementioned antenna and audio equipment are projected perpendicular to the motherboard plane, defining a main antenna projection area, a ground projection area, and a motherboard projection area. By configuration, at least a portion of the main antenna projection area and at least a portion of the ground projection area are located outside the motherboard projection area, reducing motherboard interference to the antenna. Furthermore, the first end of the extended ground wire is coupled to the first end of the main antenna, and the second end of the extended ground wire is coupled to the second end of the main antenna, i.e., a bidirectional coupling method is used to connect the main antenna and the extended ground wire. This solution places part or all of the antenna traces outside the motherboard projection area, making efficient use of product space and facilitating miniaturization. The dual-coupled antenna design allows for the reconstruction of an antenna capable of achieving multiple antenna resonance modes, reducing antenna design complexity and offering advantages such as low signal reflection and balanced radiation direction, significantly improving the antenna's external radiation efficiency and fully meeting the requirements of long-distance and wall-penetrating wireless data transmission scenarios. Attached Figure Description

[0008] To more clearly illustrate the technical solutions in the embodiments of this application or the conventional technology, the drawings used in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0009] Figure 1 This is a schematic diagram of the audio device structure in one embodiment of this application;

[0010] Figure 2 This is a schematic diagram of the antenna configuration in one embodiment of this application;

[0011] Figure 3 This is a schematic diagram of the antenna configuration in another embodiment of this application;

[0012] Figure 4 This is a schematic diagram of the external structure of an audio device in one embodiment of this application;

[0013] Figure 5 This is a schematic diagram of the S11 return loss waveform of an audio device in one embodiment of this application;

[0014] Figure 6 This is a schematic diagram of the antenna radiation efficiency waveform of an audio device in one embodiment of this application;

[0015] Figure 7 This is a schematic diagram of a Smith chart of an audio device according to an embodiment of this application;

[0016] Figure 8This is an example of an antenna radiation pattern in three sections of the 2.4G band in one embodiment of this application;

[0017] Figure 9 This is an example of the antenna radiation pattern of three sections of the 5G band in one embodiment of this application. Detailed Implementation

[0018] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings. Preferred embodiments of this application are shown in the drawings. However, this application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of this application.

[0019] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0020] It is understood that the terms "first," "second," etc., used herein may be used to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another. For example, without departing from the scope of this application, a first resistor may be referred to as a second resistor, and similarly, a second resistor may be referred to as a first resistor. Both the first resistor and the second resistor are resistors, but they are not the same resistor.

[0021] It is understood that the term "connection" in the following embodiments should be understood as "electrical connection," "communication connection," etc., if the connected circuits, modules, units, etc., have electrical signal or data transmission with each other.

[0022] It is understandable that "at least one" refers to one or more, and "multiple" refers to two or more. "At least a part of an element" refers to part or all of an element.

[0023] When used herein, the singular forms of “a,” “an,” and “the” may also include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms “comprising / including” or “having,” etc., specify the presence of the stated features, wholes, steps, operations, components, parts, or combinations thereof, but do not preclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof. Meanwhile, the term “and / or” as used in this specification includes any and all combinations of the associated listed items.

[0024] The antenna in this application embodiment is applied to an electronic device with wireless data transceiver capabilities. Its type is not unique and can include audio devices, wearable devices, routers, mobile phones, etc. No specific limitation is imposed; the antenna can be selected based on actual needs. The audio device can be headphones, a pickup device, a recording device, etc., and no specific limitation is imposed.

[0025] To facilitate understanding of the technical solution of this application, the following embodiments use a microphone as an example for explanation. Please refer to the relevant documents. Figure 1 The microphone includes a motherboard 11, a battery 12, an antenna feed point 14, an antenna body 13, a button 15, a magnet, and a microphone 17. The antenna covers the top of the motherboard, which has a shielding cover 16 (typically 1.1 mm high). The distance between the antenna and the shielding cover 16 is 1.3 mm to 1.8 mm. The antenna feed point 14 on the motherboard 11, also known as the antenna spring, feeds the motherboard signal to the antenna trace. In such a harsh environment, not only is the antenna inefficient, but routing the trace above the motherboard 11 introduces unknown interference problems. The antenna's radiation efficiency in all directions is low, and its sensitivity deteriorates significantly, resulting in low Wi-Fi throughput and dead zones in many directions.

[0026] To alleviate the above phenomenon, this application proposes a new antenna design scheme, which configures part or all of the antenna traces outside the motherboard projection area, thereby reducing the interference of the motherboard to the antenna. At the same time, it adopts a bidirectional coupling method between the main antenna and the extended ground wire, which better integrates the motherboard as a radiator and participates in antenna radiation together. This makes it more suitable for data transmission in long-distance and wall-penetrating scenarios and improves the external radiation efficiency.

[0027] Please see Figure 2 This application provides an antenna, including a main antenna 110, an extended ground wire 130, a feed spring 120, and a first ground spring 140. At least a portion of the main antenna projection area is located outside the motherboard projection area. The main antenna projection area is the area formed by projecting the main antenna 110 along a direction perpendicular to the motherboard plane. The motherboard projection area is the area formed by projecting the motherboard (i.e., Figure 11) along a direction perpendicular to the motherboard plane. The motherboard plane is the surface of the motherboard used for integrating electronic devices. The feed spring 120 connects the main antenna 110 and the motherboard. At least a portion of the ground wire projection area is located outside the motherboard projection area. The first end of the extended ground wire 130 is coupled to the first end of the main antenna 110, and the second end of the extended ground wire 130 is coupled to the second end of the main antenna 110. The ground wire projection area is the area formed by projecting the extended ground wire 130 along a direction perpendicular to the motherboard plane. The first ground spring 140 connects the extended ground wire 130 and the motherboard.

[0028] Specifically, the main antenna 110 is the wiring responsible for converting guided waves on the transmission line into electromagnetic waves in free space (transmission scenario), or converting electromagnetic waves in space into guided waves (reception scenario). The extended ground wire 130 is used to improve antenna performance by optimizing the grounding environment. The feed spring 120 is used to connect the motherboard and the main antenna 110, transmitting RF signals from the motherboard to the main antenna 110, or feeding back the transmitted signals from the main antenna 110 to the motherboard. The first ground spring 140 is the device that connects the extended ground wire 130 to ground.

[0029] The motherboard is a control circuit board that integrates the main control chip, radio frequency module, and other peripheral circuits, enabling wireless signal transmission and reception control. The motherboard plane is the surface on the motherboard used to integrate various electronic components and route traces.

[0030] In this embodiment, at least a portion of the main antenna projection area formed by projecting the main antenna 110 in a direction perpendicular to the motherboard plane is disposed outside the motherboard projection area formed by projecting the motherboard in a direction perpendicular to the motherboard plane, and at least a portion of the ground line projection area formed by projecting the extended ground line 130 in a direction perpendicular to the motherboard plane is disposed outside the motherboard projection area, thereby reducing the interference of the motherboard area (including the motherboard and various electronic devices integrated on the motherboard) on the antenna traces.

[0031] For more detailed information, please refer to the relevant documents. Figure 2 The motherboard projection area of ​​the main antenna 110 can be entirely configured outside the motherboard projection area, and / or the ground projection area of ​​the extended ground line 130 can be entirely configured outside the motherboard projection area, further reducing the interference of the motherboard to the antenna traces and improving the radiation efficiency.

[0032] It should be noted that the routing method of the main antenna 110 or the extended ground wire 130 is not unique; they can be the same or different, depending on the specific scenario. Taking the main antenna 110 as an example, in one embodiment, the main antenna 110 can be routed along the edge of the motherboard. If the motherboard is circular, the main antenna 110 can be arranged in an arc shape. This method reduces interference to the antenna and places it further away from the shielding cover, thus increasing the antenna's radiation efficiency. In other embodiments, the main antenna 110 can also be arranged as a straight line or an irregular curve, without limitation.

[0033] The main antenna 110 has two ports. The first port of the main antenna 110 is coupled to the first port of the extended ground line 130. Thus, the section of the main antenna 110 from the location of the feed spring 120 to the first port of the main antenna 110, and the section of the extended ground line 130 from the location of the first ground spring 140 to the first port of the extended ground line 130, are excited to form an antenna with a first frequency band. The section of the main antenna 110 from the location of the feed spring 120 to the second port of the main antenna 110, and the section of the extended ground line 130 from the location of the first ground spring 140 to the second port of the extended ground line 130, are excited to form an antenna with a second frequency band. That is, the scheme of this embodiment can form a dual-resonant antenna through bidirectional coupling.

[0034] It is understood that the size of the first and second frequency bands is not unique; they can be the same or different, depending on the specific scenario. For example, in one embodiment, the first frequency band is a 5G band, and the second frequency band is a 2.4G band.

[0035] It should be noted that in actual scenarios, the length of the extended ground wire 130 can be adjusted according to actual needs. The extended ground wire 130 can be connected to the first grounding spring 140 in different wiring methods (it can be connected to different positions of the first grounding spring 140), thereby changing the length of the extended ground wire 130 of the first frequency band antenna or changing the length of the extended ground wire 130 of the second frequency band antenna. The specific configuration can be combined with the actual needs.

[0036] The aforementioned antenna projects in a direction perpendicular to the motherboard plane, defining a main antenna projection area, a ground projection area, and a motherboard projection area. By configuration, at least a portion of the main antenna projection area and at least a portion of the ground projection area are located outside the motherboard projection area, reducing motherboard interference to the antenna. Furthermore, the first end of the extended ground wire 130 is coupled to the first end of the main antenna 110, and the second end of the extended ground wire 130 is coupled to the second end of the main antenna 110, i.e., a bidirectional coupling method is used to connect the main antenna 110 and the extended ground wire 130. This scheme, by configuring part or all of the antenna traces outside the motherboard projection area and employing a dual-coupled antenna design, reconstructs an antenna capable of achieving multiple antenna resonance modes. It has advantages such as low signal reflection and balanced radiation direction, significantly improving the antenna's external radiation efficiency and fully meeting the requirements of long-distance and wall-penetrating wireless data transmission scenarios.

[0037] In one embodiment, the main antenna 110 includes a connection point for connecting to the feed spring 120. The length of the first main antenna between the connection point and a first end of the main antenna 110 is less than the length of the second main antenna between the connection point and a second end of the main antenna 110.

[0038] Specifically, in this embodiment, the main antenna 110 is divided into two segments based on the connection point of the feed spring 120. One segment is the area between the connection point and the first end of the main antenna 110, i.e., the first main antenna; the other segment is the area between the connection point and the second end of the main antenna 110, i.e., the second main antenna. In this embodiment, the length of the first main antenna is configured to be less than the length of the second main antenna. Based on the principle that the frequency of the antenna is inversely proportional to its length, the frequency band of the first frequency band antenna formed by the first main antenna and the extended ground line 130 is greater than the frequency band of the second frequency band antenna formed by the second main antenna and the extended ground line 130. By dividing the main antenna 110 into two segments and matching them with different frequency bands, combined with the synergistic effect of the extended ground line 130, independent resonance of high frequency (short antenna) and low frequency (long antenna) is achieved, thereby exciting two different frequency bands: a higher frequency and a lower frequency.

[0039] The above scheme divides the main antenna 110 into a first main antenna and a second main antenna of different lengths by connecting the feed spring 120, thereby exciting two different frequency bands, namely higher frequency and lower frequency, and improving the applicability of the antenna.

[0040] In one embodiment, the length of the second main antenna is 1 to 3 times the length of the first main antenna.

[0041] Specifically, the lengths of the second and first main antennas are not unique; they can be configured according to the actual required frequency band. In this embodiment, the length of the second main antenna is 1 to 3 times the length of the first main antenna. In this way, the frequency of the first frequency band antenna can reach 1 to 3 times that of the second frequency band antenna, which can meet the application scenario where the higher frequency is 1 to 3 times that of the lower frequency.

[0042] In one embodiment, the length of the second main antenna is 1.5 to 2.5 times the length of the first main antenna.

[0043] Specifically, in practical scenarios, a lower frequency of 2.4 GHz and a higher frequency of 5 GHz are typically used as a dual-resonance configuration. To meet this requirement, the length of the second main antenna needs to be approximately twice the length of the first main antenna. However, considering the influence of interference signals, the length of the second main antenna can be 1.5 to 2.5 times the length of the first main antenna. More specifically, in one embodiment, without considering errors caused by interference signals, the length of the second main antenna can be configured to be twice the length of the first main antenna.

[0044] Please see Figure 3 In one embodiment, the antenna further includes a second grounding spring 150, which is connected to the main antenna 110 and the motherboard.

[0045] Specifically, in this embodiment, a second grounding spring 150 is also connected to the main antenna 110. The second grounding spring 150 forms a new electrical connection between the main antenna 110 and the motherboard, effectively adding a low-impedance grounding loop to the antenna. This path shortens the effective current return distance, changing the original current distribution pattern of the main antenna 110, thus effectively lengthening or shortening the antenna's electrical length, i.e., changing the antenna's equivalent electrical length and affecting its resonant frequency. Therefore, by adjusting the position or number of the second grounding springs 150, the antenna's operating bandwidth can be expanded or reduced to adapt to multi-band communication requirements.

[0046] It should be noted that the method of connecting the second grounding spring 150 to the main antenna 110 is not unique. In one embodiment, the second grounding spring 150 can be connected to the same location on the main antenna 110 as the feed spring 120, so as to achieve rapid adjustment of the resonant frequency by precisely controlling the electrical length, which is suitable for scenarios with high frequency accuracy requirements. In another embodiment, it can also be connected to different locations, which can expand the operating bandwidth and support multi-band independent optimization by flexibly adjusting the current distribution and impedance matching, which is suitable for complex communication environments that need to cover wide bandwidth or multiple frequency bands. The appropriate method can be selected based on actual needs.

[0047] In one embodiment, the main antenna 110 and the extended ground wire 130 are distributedly coupled together.

[0048] Specifically, the main antenna 110 and the extended ground line 130 form a closed-loop radiator through current coupling, enhancing the low-frequency radiation intensity. This coupling also alters the real part (resistance) and imaginary part (reactance) of the antenna input impedance, achieving impedance matching with the feed spring 120 (feed port). The coupling method between the main antenna 110 and the extended ground line 130 is not unique; it can be electrical connection coupling, capacitive coupling, inductive coupling, distributed coupling, etc., without specific limitations.

[0049] This embodiment uses distributed coupling as an example for explanation. The main antenna 110 and the extended ground wire 130 form a distributed capacitance through a parallel gap, and the edge electric field in the gap becomes the energy transfer path. This coupling method has the advantage of high coupling strength control precision, which greatly improves the transmission accuracy of the antenna.

[0050] In one embodiment, the first distance between the first end of the extended ground wire 130 and the first end of the main antenna 110 is 0.5 mm to 3 mm; and / or, the second distance between the second end of the extended ground wire 130 and the second end of the main antenna 110 is 0.5 mm to 3 mm.

[0051] Specifically, in distributed coupling, it is necessary to extend the distance between the ground wire 130 and the main antenna 110. This involves extending the first distance between the first end of the ground wire 130 and the first end of the main antenna 110, and extending the second distance between the second end of the ground wire 130 and the second end of the main antenna 110. These two distances can be the same or different, depending on the actual requirements. In this embodiment, the first distance can be configured to be 0.5 mm to 3 mm, for example, 0.5 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, etc., and can be any value between 0.5 mm and 3 mm, without specific limitation. The configuration of the second distance is similar to that of the first distance and will not be repeated here.

[0052] The above scheme configures the first distance to 0.5 mm-3 mm and / or the second distance to 0.5 mm-3 mm. While meeting the coupling requirements between the extended ground wire 130 and the main antenna 110, it can also avoid the distance between the two being too large, which would occupy too much space and is conducive to the miniaturization of the device.

[0053] In one embodiment, the first distance between the first end of the extended ground wire 130 and the first end of the main antenna 110 is 0.5 mm to 2 mm; and / or, the second distance between the second end of the extended ground wire 130 and the second end of the main antenna 110 is 0.5 mm to 2 mm.

[0054] Specifically, in the distributed coupling scheme, increasing the spacing directly leads to the diffusion of the edge electric field distribution, causing the coupling capacitance value to decrease exponentially. Therefore, in this embodiment, to avoid a small coupling capacitance and improve energy transfer efficiency, the first distance can be configured to be 0.5 mm-2 mm, and / or the second distance can be configured to be 0.5 mm-2 mm. For example, 0.5 mm, 0.8 mm, 1 mm, 1.2 mm, 1.4 mm, 1.6 mm, 1.8 mm, 2 mm, etc., can be any value between 0.5 mm and 2 mm, and there is no specific limitation.

[0055] The above scheme configures the first distance to 0.5 mm-2 mm and / or the second distance to 0.5 mm-2 mm, thereby forming strong capacitive coupling and greatly improving the energy transfer efficiency of the antenna.

[0056] In one embodiment, the first coupling projection region is located outside the motherboard projection region, and / or the second coupling projection region is located outside the motherboard projection region.

[0057] The first coupling projection area is the area formed by projecting the first coupling position along a direction perpendicular to the motherboard plane. The first coupling position is the location point where the first end of the extended ground wire 130 is coupled to the first end of the main antenna 110. The second coupling projection area is the area formed by projecting the second coupling position along a direction perpendicular to the motherboard plane. The second coupling position is the location point where the second end of the extended ground wire 130 is coupled to the second end of the main antenna 110.

[0058] In practical scenarios, the point where the first end of the extended ground wire 130 is coupled to the first end of the main antenna 110 can be configured outside the motherboard projection area, depending on the requirements. This reduces the impact of the motherboard on this point, lowers electromagnetic interference, optimizes impedance matching, enhances signal transmission efficiency, improves radiation efficiency, expands model coverage, and supports flexible multi-band optimization to adapt to complex environments, ultimately significantly improving the sensitivity of the coupling point. Alternatively, the point where the second end of the extended ground wire 130 is coupled to the second end of the main antenna 110 can also be configured outside the motherboard projection area to reduce the impact of the motherboard on this point and improve the coupling reliability between the second end of the extended ground wire 130 and the second end of the main antenna 110. More specifically, in one embodiment, both of the above points can be configured outside the motherboard projection area; the choice can be made based on actual needs.

[0059] In one embodiment, the main antenna 110 is disposed on the periphery of the motherboard, and the main antenna 110 is spaced apart from the sidewall of the motherboard by a preset distance; the extended ground wire 130 is disposed on the periphery of the motherboard, and the extended ground wire 130 is spaced apart from the sidewall of the motherboard by a preset distance.

[0060] Specifically, in this embodiment, based on the routing of the main antenna 110 and the extended ground line 130 along the edge of the motherboard, the main antenna 110 and the extended ground line 130 are both set at a preset distance from the motherboard sidewall. This ensures that the projections of the main antenna 110 and the extended ground line 130 onto the main antenna projection area are completely outside the motherboard projection area. In this way, while ensuring the product size is not excessively large, interference to the antenna is minimized, further improving the overall performance of the antenna.

[0061] The preset distance is not unique, and the preset distances of the main antenna 110 and the extended ground wire 130 can be the same or different. The specific choice can be made according to actual needs, and there is no limitation here.

[0062] This application also provides an audio device, including a motherboard, a battery, a microphone, and the aforementioned antenna, wherein the motherboard and the microphone are respectively connected to the battery.

[0063] Specifically, this embodiment uses the application of the above-mentioned antenna in an audio device as an example for explanation and illustration. The specific structure and configuration of the antenna are as shown in the above embodiments and accompanying drawings, and will not be repeated here.

[0064] The aforementioned audio device projects data in a direction perpendicular to the motherboard plane, defining a main antenna projection area, a ground projection area, and a motherboard projection area. By configuration, at least a portion of the main antenna projection area and at least a portion of the ground projection area are located outside the motherboard projection area, reducing motherboard interference to the antenna. Furthermore, the first end of the extended ground wire 130 is coupled to the first end of the main antenna 110, and the second end of the extended ground wire 130 is coupled to the second end of the main antenna 110, i.e., a bidirectional coupling method is used to connect the main antenna 110 and the extended ground wire 130. This solution, by configuring part or all of the antenna traces outside the motherboard projection area and employing a dual-coupled antenna design, reconstructs an antenna capable of achieving multiple antenna resonance modes. It has advantages such as low signal reflection and balanced radiation direction, significantly improving the antenna's external radiation efficiency and fully meeting the requirements of long-distance and wall-penetrating wireless data transmission scenarios.

[0065] Please see Figure 4 In one embodiment, the audio device includes a housing, a main antenna 110, and / or an extended ground wire 130 disposed on the outer surface of the housing.

[0066] Specifically, in this embodiment, the main antenna 110 and / or the extended ground wire 130 are disposed on the outer surface of the housing, thereby enabling wireless communication with other devices (such as routers or mobile phones). Spatial electromagnetic waves can be received by the antenna without passing through the housing, which can further improve the antenna radiation efficiency of the audio device.

[0067] It is understood that the method of setting the main antenna 110 and / or extended ground wire 130 on the outer surface of the housing is not unique. In one embodiment, the main antenna 110 and / or extended ground wire 130 can be directly laid on the outer surface of the housing. In another embodiment, the outer surface of the housing can be grooved first, and then the main antenna 110 and / or extended ground wire 130 can be laid in the groove. In other embodiments, the housing can also have a through hole that penetrates the inside and outside of the housing, and the main antenna 110 and / or extended ground wire 130 can be filled in the through hole. The specific arrangement can be determined according to actual needs.

[0068] To facilitate understanding of the technical solution of this application, the following detailed embodiments will be used to explain and illustrate this application.

[0069] In this embodiment, the antenna is applied to an audio device. The projection area of ​​the main antenna 110, projected perpendicularly to the motherboard plane, is entirely located outside the motherboard projection area. Similarly, the projection area of ​​the ground wire, projected perpendicularly to the motherboard plane, is entirely located outside the motherboard projection area. The main antenna 110 includes a connection point that divides it into a first main antenna (connection point to the first end of the main antenna 110) and a second main antenna (connection point to the second end of the main antenna 110). The connection point of the main antenna 110 is connected to the motherboard via a feed spring 120. A first ground spring 140 is positioned opposite the feed spring 120, connecting the extended ground wire 130 and the motherboard. A second ground spring 150 is also positioned at the feed spring 120, connecting the second main antenna to the motherboard via the second ground spring 150.

[0070] The first coupling projection area, formed by projecting the location where the first main antenna is coupled to the extended ground line 130 in a direction perpendicular to the motherboard plane, is located outside the motherboard projection area. Similarly, the second coupling projection area, formed by projecting the location where the second main antenna is coupled to the extended ground line 130 in a direction perpendicular to the motherboard plane, is also located outside the motherboard projection area. The coupling gap between the first main antenna and the extended ground line 130 (as a 5G coupling section) is 0.5mm-2mm, and the coupling gap between the second main antenna and the extended ground line 130 (as a 2.4G coupling section) is 0.5mm-2mm. The length of the second main antenna is configured to be 1.5 to 2.5 times the length of the first main antenna.

[0071] Please refer to the following: Figure 5 , Figure 6 and Figure 7 The S11 return loss waveform, antenna radiation efficiency waveform, and Smith chart of the audio device were obtained respectively. Combining the waveforms, it can be seen that the average antenna radiation efficiency of 2.4G is above 35%, and the average antenna radiation efficiency of 5G is above 40%, which meets the basic design requirements.

[0072] Please refer to the following: Figure 8 and Figure 9 The radiation patterns of the audio device were obtained from three cross-sections. Regardless of whether it was 2.4G or 5G, the radiation patterns showed no obvious indentation in the 360° radiation, which met the design requirements.

[0073] In the description of this specification, references to terms such as "some embodiments," "other embodiments," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative descriptions of the above terms do not necessarily refer to the same embodiments or examples.

[0074] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0075] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. An antenna, characterized in that, include: The main antenna has at least a portion of its projection area located outside the motherboard projection area; wherein the main antenna projection area is the area formed by projecting the main antenna along a direction perpendicular to the motherboard plane, the motherboard projection area is the area formed by projecting the motherboard along a direction perpendicular to the motherboard plane, and the motherboard plane is the surface of the motherboard used for integrating electronic devices. A feed spring is used to connect the main antenna and the main board; An extended ground wire is provided, with at least a portion of its projection area located outside the motherboard projection area. A first end of the extended ground wire is coupled to a first end of the main antenna, and a second end of the extended ground wire is coupled to a second end of the main antenna. The projection area of ​​the ground wire is the region formed by projecting the extended ground wire along a direction perpendicular to the motherboard plane. The first grounding spring connects the extended ground wire and the motherboard.

2. The antenna according to claim 1, characterized in that, The main antenna includes a connection point for connecting the feed spring. The length of the first main antenna between the connection point and the first end of the main antenna is less than the length of the second main antenna between the connection point and the second end of the main antenna.

3. The antenna according to claim 2, characterized in that, The length of the second main antenna is 1 to 3 times the length of the first main antenna.

4. The antenna according to claim 1, characterized in that, The antenna also includes a second grounding spring, which is connected to the main antenna and the motherboard.

5. The antenna according to any one of claims 1-4, characterized in that, The main antenna and the extended ground wire are connected in a distributed coupling manner.

6. The antenna according to claim 5, characterized in that, The first distance between the first end of the extended ground wire and the first end of the main antenna is 0.5 mm to 3 mm; and / or, the second distance between the second end of the extended ground wire and the second end of the main antenna is 0.5 mm to 3 mm.

7. The antenna according to claim 6, characterized in that, The first distance between the first end of the extended ground wire and the first end of the main antenna is 0.5 mm to 2 mm; and / or, the second distance between the second end of the extended ground wire and the second end of the main antenna is 0.5 mm to 2 mm.

8. The antenna according to any one of claims 1-4, characterized in that, The first coupling projection area is located outside the motherboard projection area, and / or the second coupling projection area is located outside the motherboard projection area; wherein, the first coupling projection area is the area formed by projecting a first coupling position along a direction perpendicular to the motherboard plane, the first coupling position being the location point where the first end of the extended ground wire is coupled to the first end of the main antenna; the second coupling projection area is the area formed by projecting a second coupling position along a direction perpendicular to the motherboard plane, the second coupling position being the location point where the second end of the extended ground wire is coupled to the second end of the main antenna.

9. The antenna according to claim 8, characterized in that, The main antenna is disposed on the periphery of the motherboard, and the main antenna is spaced at a preset distance from the side wall of the motherboard; The extended ground wire is disposed on the periphery of the motherboard, and the extended ground wire is spaced at a predetermined distance from the side wall of the motherboard.

10. An audio device, characterized in that, It includes a motherboard, a battery, a microphone, and an antenna as described in any one of claims 1-9, wherein the motherboard and the microphone are respectively connected to the battery.

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