4G full-band main antenna suitable for wearable device

Abstract

The application relates to a 4G full-band main antenna suitable for a wearable device, which comprises a wearable device shell serving as an antenna support and provided with a low-frequency radiation branch, a medium-frequency radiation branch, a high-frequency radiation branch and a medium-frequency coupling radiation branch on the surface respectively. The low-frequency radiation branch is in an inverted F structure, two short branch ends of which are respectively provided with a feeding point and a second grounding point to jointly form a PIFA antenna basic structure. The high-frequency radiation branch is provided with a first grounding point for generating high frequency. The medium-frequency radiation branch is connected with the low-frequency radiation branch. The medium-frequency coupling radiation branch is provided with a third grounding point, and the medium-frequency coupling radiation branch is coupled with the low-frequency radiation branch to generate medium frequency, and the medium frequency generated by the medium-frequency coupling radiation branch is superposed with the medium frequency generated by the medium-frequency radiation branch to increase the medium-frequency bandwidth. The antenna clearance of the application is only 2mm, supports a narrow black border and a high screen ratio appearance, the efficiency is improved by about 2dB compared with a traditional antenna, the bandwidth is wider, the structure is simple, the manufacturing is simple, the mass production consistency is high, the loss is low and the reliability is high.

Description

Technical Field

[0001] This invention relates to the field of wireless communication technology, and more specifically to a 4G full-band main antenna suitable for wearable devices. Background Technology

[0002] With the widespread adoption of smart wearable devices (especially smartwatches with plastic casings), 4G communication has become a necessity. Antennas, as crucial carriers for signal reception and transmission, significantly impact signal transmission in communication. In traditional antenna design, antenna performance is heavily dependent on the available space. However, the internal space of a smartwatch is extremely compact, requiring high frequency band coverage and significant human body coupling loss. Traditional direct-fed antennas (monopolar, PIFA) suffer from narrow bandwidth, complex layout, and assembly tolerances affecting consistency. Therefore, there is an urgent need for a coupling antenna solution that is suitable for plastic casings, requires minimal space, is resistant to human body interference, and covers the 4G frequency band.

[0003] However, as wearable devices become increasingly feature-rich, the metal frame, motherboard, battery, and shielding cover encroach on antenna space, reducing the clearance area and leaving less and less space for the antenna. Traditional antennas typically require a clearance of around 8mm, resulting in a large black border on the screen, a small screen-to-body ratio, and an unattractive appearance. Currently, the clearance requirement in the market is generally around 2mm. To achieve a better product appearance and a larger screen-to-body ratio, the clearance for the antenna is becoming increasingly smaller. Under these antenna conditions, to ensure antenna performance, a new antenna design is needed to improve overall antenna performance and meet market demands. Summary of the Invention

[0004] The purpose of this invention is to overcome the problems existing in the prior art and provide a 4G full-band main antenna suitable for wearable devices. By adopting this antenna coupling scheme, it is possible to ensure that, in the same size environment, without occupying additional clearance, and by utilizing parasitic coupling, multi-frequency, high-efficiency, and anti-human interference radiation can be achieved in a small space, thus solving the problem of poor signal of the main antenna of current wearable devices.

[0005] To achieve the above-mentioned technical objectives and effects, the present invention is implemented through the following technical solution: A 4G full-band main antenna suitable for wearable devices includes a wearable device housing. The wearable device housing serves as an antenna support, and its surface is respectively provided with low-frequency radiating branches, intermediate-frequency radiating branches, high-frequency radiating branches, and intermediate-frequency coupled radiating branches, wherein: The low-frequency radiating branch has an inverted F structure, with a feed point and a second ground point at the ends of its two short branches, which together form the basic structure of the PIFA antenna. The high-frequency radiation branch is provided with a first grounding point for generating high frequencies; The intermediate frequency radiation branch is connected to the low frequency radiation branch; The intermediate frequency coupling radiation branch is provided with a third grounding point. The intermediate frequency coupling radiation branch is coupled with the low frequency radiation branch to generate an intermediate frequency, and is superimposed with the intermediate frequency generated by the intermediate frequency radiation branch to increase the intermediate frequency bandwidth.

[0006] Furthermore, the intermediate frequency radiation branch is formed by extending the long branch of the low frequency radiation branch outward to the end with the short branch.

[0007] Furthermore, the high-frequency radiation branch is arranged parallel to one side of the long branch of the low-frequency radiation branch, and a short branch is provided at one end of the high-frequency radiation branch near the short branch of the low-frequency radiation branch, extending vertically and away from the long branch of the low-frequency radiation branch. A first grounding point is provided at the end of the extended short branch.

[0008] Furthermore, the mid-frequency coupling radiation branch is coupled in parallel with the long branch of the low-frequency radiation branch. One end of the mid-frequency coupling radiation branch goes around the back of the wearable device housing and is adjacent to the other side of the long branch of the low-frequency radiation branch, and extends in the opposite direction parallel to the long branch of the low-frequency radiation branch, forming a part of the double-sided coupling area of ​​the low-frequency radiation branch. The third grounding point is located on the mid-frequency coupling radiation branch winding part on the back of the wearable device housing.

[0009] Furthermore, the power supply point, the first grounding point, and the second grounding point are located on the back of the wearable device housing.

[0010] Furthermore, the second and third grounding points are connected to the wearable device motherboard via corresponding antenna switches to switch different radiation branches, thereby generating different states to cover the entire 4G frequency band.

[0011] Furthermore, the wearable device housing is made of LDS material, and a gold-containing plating layer is deposited on the surface through laser engraving and chemical plating processes to form various radiating branches, thereby reducing conductor loss and improving radiation efficiency.

[0012] The beneficial effects of this invention are: The antenna of this invention can ensure that, within the same size environment, it does not occupy additional clearance, utilizes parasitic coupling, and achieves multi-frequency, high-efficiency, and anti-human interference radiation in a confined space. It has low coupling loss, solves the problem of poor signal of the main antenna of current wearable devices, and requires only 2mm clearance, supporting a narrow black bezel and high screen ratio appearance. Its efficiency is improved by about 2dB compared with traditional antennas. It has multiple resonance superposition, wider bandwidth, and simple structure. It can be manufactured using LDS+ gold-plated process, with high mass production consistency, low loss, and high reliability. Attached Figure Description

[0013] Figure 1 This is a frontal, left-leaning perspective view of the antenna of the present invention; Figure 2 This is a frontal, right-angle perspective view of the antenna of the present invention; Figure 3 This is a perspective view of the back of the antenna of the present invention; Figure 4 The return loss S11 test curve of the antenna of the present invention is shown. Figure 5 A comparison of the passive efficiency of the antenna of this invention with that of a conventional antenna in an anechoic chamber.

[0014] The labels in the diagram are as follows: 1. Power supply point, 2. First grounding point, 3. Second grounding point, 4. Third grounding point, 5. Intermediate frequency radiation branch, 6. Low frequency radiation branch, 7. Intermediate frequency coupling radiation branch, 8. High frequency radiation branch, 9. Wearable device housing. Detailed Implementation

[0015] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0016] like Figures 1 to 3 As shown, to facilitate observation, understanding, and implementation of the radiating branch shape and structural orientation of the present invention, each radiating branch has been colored. A 4G full-band main antenna suitable for wearable devices includes a wearable device housing 9. The wearable device housing 9 serves as an antenna support, and its surface is respectively provided with low-frequency radiating branches 6, intermediate-frequency radiating branches 5, high-frequency radiating branches 8, and intermediate-frequency coupled radiating branches 7, wherein: The low-frequency radiating branch 6 has an inverted F structure, with a feed point 1 and a second grounding point 3 at the ends of its two short branches, which together form the basic structure of the PIFA antenna. The high-frequency radiation branch 8 is provided with a first grounding point 2 for generating high frequency; The intermediate frequency radiation branch 5 is connected to the low frequency radiation branch 6; The intermediate frequency coupling radiation branch 7 is provided with a third grounding point 4. The intermediate frequency coupling radiation branch 7 is coupled with the low frequency radiation branch 6 to generate intermediate frequency, and is superimposed with the intermediate frequency generated by the intermediate frequency radiation branch 5 to increase the intermediate frequency bandwidth.

[0017] The intermediate frequency radiation branch 5 is formed by extending the long branch node of the low frequency radiation branch 6 outward to the end with the short branch node.

[0018] The high-frequency radiation branch 8 is arranged parallel to one side of the long branch of the low-frequency radiation branch 6. At one end of the high-frequency radiation branch 8 near the short branch of the low-frequency radiation branch 6, there is a short branch that extends vertically and away from the long branch of the low-frequency radiation branch 6. A first grounding point 2 is provided at the end of the extended short branch.

[0019] The intermediate frequency coupling radiation branch 7 is coupled in parallel with the long branch of the low frequency radiation branch 6. One end of the intermediate frequency coupling radiation branch 7 passes around the back of the wearable device housing 9 and is adjacent to the other side of the long branch of the low frequency radiation branch 6, and extends in the opposite direction parallel to the long branch of the low frequency radiation branch 6, forming a part of the double-sided coupling area of ​​the low frequency radiation branch 6. The third grounding point 4 is located on the winding part of the intermediate frequency coupling radiation branch 7 on the back of the wearable device housing 9.

[0020] The power supply point 1, the first grounding point 2, and the second grounding point 3 are located on the back of the wearable device housing 9.

[0021] The second grounding point 3 and the third grounding point 4 are connected to the wearable device motherboard through corresponding antenna switches to switch different radiation branches to generate different states to cover the entire 4G frequency band.

[0022] The wearable device housing 9 is made of LDS material, and a gold-containing plating layer is deposited on the surface through laser engraving and chemical plating processes to form various radiating branches, thereby reducing conductor loss and improving radiation efficiency.

[0023] like Figure 4 and Figure 5 As shown, from Figure 4 As can be seen from the return loss, the solution of this invention can completely cover the 4G frequency band, and from... Figure 5 It can be seen that the coupling scheme of the present invention is about 1dB more efficient than the conventional scheme, and the overall efficiency is better than the conventional scheme, especially in the B3 band.

[0024] Principle of this invention This invention enhances antenna performance through the mutual coupling of antenna radiating branches. Radio frequency signals are input to the main radiator from the feed point, generating a fundamental resonance. The near-field electromagnetic field of the main radiator is coupled to the parasitic element through the coupling gap capacitor. The parasitic element is excited, generating a secondary resonance in the B3 band. The superposition of multiple resonances can broaden the bandwidth, improve radiation efficiency, and optimize the radiation pattern (reducing radiation from the human side). The coupling strength is controlled by the spacing, overlap area, parasitic length, and dielectric constant, and different states are switched by the antenna switch to cover the entire 4G frequency band.

[0025] Furthermore, it should be noted that, unless otherwise specified or indicated, the terms "first," "second," "third," etc., in the specification are used only to distinguish the various components, elements, and steps in the specification, and are not used to indicate the logical or sequential relationships between the various components, elements, and steps.

[0026] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A 4G full-band main antenna suitable for wearable devices, comprising a wearable device housing (9), characterized in that, The wearable device housing (9) serves as an antenna support and has low-frequency radiation branches (6), intermediate-frequency radiation branches (5), high-frequency radiation branches (8), and intermediate-frequency coupling radiation branches (7) on its surface, wherein: The low-frequency radiating branch (6) is an inverted F structure, with a feed point (1) and a second grounding point (3) at the ends of its two short branches, which together form the basic structure of the PIFA antenna. The high-frequency radiation branch (8) is provided with a first grounding point (2) for generating high frequency; The intermediate frequency radiation branch (5) is connected to the low frequency radiation branch (6); The intermediate frequency coupling radiation branch (7) is provided with a third grounding point (4). The intermediate frequency coupling radiation branch (7) is coupled with the low frequency radiation branch (6) to generate intermediate frequency, and is superimposed with the intermediate frequency generated by the intermediate frequency radiation branch (5) to increase the intermediate frequency bandwidth.

2. The 4G full-band main antenna for wearable devices according to claim 1, characterized in that, The mid-frequency radiation branch (5) is formed by the extension of the long branch node of the low-frequency radiation branch (6) outward to the end with the short branch node.

3. The 4G full-band main antenna for wearable devices according to claim 2, characterized in that, The high-frequency radiation branch (8) is arranged parallel to one side of the long branch of the low-frequency radiation branch (6). At one end of the high-frequency radiation branch (8) near the short branch of the low-frequency radiation branch (6), there is a short branch that extends vertically and away from the long branch of the low-frequency radiation branch (6). A first grounding point (2) is provided at the end of the extended short branch.

4. The 4G full-band main antenna for wearable devices according to claim 3, characterized in that, The intermediate frequency coupling radiation branch (7) is coupled in parallel with the long branch of the low frequency radiation branch (6). One end of the intermediate frequency coupling radiation branch (7) goes around the back of the wearable device housing (9) and is adjacent to the other side of the long branch of the low frequency radiation branch (6), and extends in the opposite direction parallel to the long branch of the low frequency radiation branch (6) to form a part of the double-sided coupling area of ​​the low frequency radiation branch (6). The third grounding point (4) is located on the winding part of the intermediate frequency coupling radiation branch (7) on the back of the wearable device housing (9).

5. The 4G full-band main antenna for wearable devices according to claim 4, characterized in that, The power supply point (1), the first grounding point (2), and the second grounding point (3) are located on the back of the wearable device housing (9).

6. The 4G full-band main antenna for wearable devices according to claim 1 or 4, characterized in that, The second grounding point (3) and the third grounding point (4) are connected to the wearable device motherboard through corresponding antenna switches to switch different radiation branches to generate different states to cover the entire 4G frequency band.

7. The 4G full-band main antenna for wearable devices according to claim 1 or 4, characterized in that, The wearable device housing (9) is made of LDS material, and a gold-containing plating layer is deposited on the surface through laser engraving and chemical plating processes to form various radiating branches, so as to reduce conductor loss and improve radiation efficiency.

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