Antenna and electronic equipment

Abstract

The invention relates to an antenna and electronic equipment. The antenna comprises a metal shell and a conductive support connected with the metal shell, and the conductive support and the metal shell are enclosed to form a cavity so as to form a half-cavity antenna. Compared with a cavity antenna with only one opening in the prior art, the antenna provided by the invention can meet the same low-frequency use condition, can reduce the size of the antenna and the occupied use volume, and reduces the cost and the volume production risk. The cavity comprises two adjacent openings, and a feeding point of the antenna is located at the adjacent position of the two openings. The antenna further comprises a tuner which is arranged on the side of any one of the openings, keeps a set distance from the center position of the circumference of the two openings, avoids the center position of a half wave, namely a current strong point area, and is high in tunable sensitivity.

Description

Technical Field

[0001] The present disclosure relates to the technical field of antenna design, and in particular to an antenna and an electronic device. Background Art

[0002] With the continuous development of communication technology, mobile phones and other electronic devices have evolved from carrying simple functions to supporting rich media such as voice, data, music, video, etc., and can also expand and install a variety of application APPs to meet people's various needs.

[0003] At the same time, production and manufacturing techniques are constantly improving, and consumers are paying more and more attention to factors such as the appearance and cost of mobile phone products. Mobile phones are constantly developing towards miniaturization, intelligence, lightness, and narrow bezels.

[0004] Therefore, the design of the antenna is often affected by factors such as the mobile phone's appearance, structure, circuit board layout, and metal parts, making development increasingly difficult. Summary of the invention

[0005] The present disclosure provides an antenna and an electronic device to solve the deficiencies in the related art.

[0006] In a first aspect, an embodiment of the present disclosure provides an antenna, comprising: a metal shell and a conductive bracket connected to the metal shell, wherein the conductive bracket and the metal shell enclose a cavity, the cavity comprises two adjacent openings, and a feeding point of the antenna is located at the adjoining position of the two openings;

[0007] The antenna further comprises a tuner, which is arranged on any side of the opening and keeps a set distance from the center position of the perimeter of the two openings.

[0008] Optionally, the tuner includes a matching circuit, the matching circuit includes a switch component, and the switch component includes a plurality of tuning branches connected in parallel; and the antenna is tuned to cover different frequency bands by controlling the closed state of each of the tuning branches.

[0009] Optionally, the matching circuit further includes: a first inductor, a first capacitor, a second inductor and a second capacitor;

[0010] Viewed from the antenna toward the feed source, the matching form of the matching circuit is: the first inductor connected to the ground in parallel, the switch component connected in parallel, the first capacitor connected in series, the second inductor connected in series, and the second capacitor connected to the ground in parallel.

[0011] Optionally, there are four tuning branches, each of which is provided with a grounded tuning element, and the tuning element is any one of a capacitor and an inductor.

[0012] Optionally, the set distance is greater than or equal to 4 mm and less than or equal to 10 mm.

[0013] Optionally, the conductive bracket includes a bracket and a conductive layer wrapped around the bracket; the conductive layer is connected to the metal shell, and the bracket, the conductive layer and the metal shell enclose the cavity.

[0014] Optionally, the conductive layer includes a main body and a bent portion, the main body is wrapped around the bracket, the main body leaves two adjacent edges empty, the bent portion is formed at other edges of the main body and bent toward the direction of the metal shell, and the bent portion is connected to the metal shell;

[0015] The main body, the bracket, the bent portion and the metal shell are enclosed to form the cavity, and two openings are formed between adjacent two side edges of the main body and the metal shell.

[0016] Optionally, it further includes a plurality of first conductive connecting members connected between the bending portion and the metal shell; the tuner is connected to one of the first conductive connecting members.

[0017] Optionally, the tuner includes a tuning circuit board, and the tuning circuit board is provided with connection lines for connecting external devices.

[0018] In a second aspect, an embodiment of the present disclosure provides an electronic device, comprising a display screen and the antenna as described in the first aspect, wherein the display screen is disposed in the metal shell and connected to the conductive bracket.

[0019] The technical solution provided by the embodiments of the present disclosure may have the following beneficial effects:

[0020] It can be seen from the above embodiments that the antenna of the present invention is formed by enclosing a conductive bracket and a metal shell to form a cavity with two adjacent openings, and the feeding point of the antenna is located at the junction of the two openings, thereby forming a semi-cavity antenna. Compared with the cavity antenna with only one opening in the related art, it can not only meet the same low-frequency usage conditions, but also reduce the size of the antenna and the occupied volume, reduce costs and mass production risks. In addition, the tuner is set on either side of the opening and maintains a set distance from the center position of the circumference of the two openings, avoiding the center position of the half-wave, that is, the area of ​​strong current, and has a high tunable sensitivity.

[0021] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0023] Figure 1 is a partial schematic diagram of an electronic device according to an exemplary embodiment.

[0024] Figure 2 is a schematic top view of an electronic device according to an exemplary embodiment.

[0025] Figure 3 is a schematic structural diagram of a matching circuit according to an exemplary embodiment.

[0026] Figure 4 is a circuit diagram of a matching circuit according to an exemplary embodiment.

[0027] Figure 5 It is a schematic diagram showing different switch matching situations of a cavity antenna according to an exemplary embodiment.

[0028] Figure 6 is a schematic top view of an electronic device according to another exemplary embodiment.

[0029] Figure 7 is a schematic diagram of a flexible circuit board of an electrical device according to an exemplary embodiment.

[0030] Figure 8 is a schematic back side view of a bracket and a conductive layer according to an exemplary embodiment.

[0031] Fig. 9 is a front schematic diagram of a bracket and a conductive layer according to an exemplary embodiment.

[0032] Fig.10 is a schematic top view of an antenna structure according to an exemplary embodiment.

[0033] Fig.11 is a schematic structural diagram of an antenna structure at another viewing angle according to an exemplary embodiment.

[0034] Figure 12 to Figure 13 FIG. 4 is a diagram showing the radiation efficiency and passive efficiency of an antenna obtained through simulation according to an exemplary embodiment.

[0035] Fig.14 is a current distribution diagram of an antenna according to an exemplary embodiment. DETAILED DESCRIPTION

[0036] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present disclosure. Instead, they are merely examples of devices and methods consistent with some aspects of the present disclosure as detailed in the appended claims.

[0037] The terms used in this disclosure are for the purpose of describing specific embodiments only and are not intended to limit the disclosure. The singular forms of "a", "said" and "the" used in this disclosure and the appended claims are also intended to include plural forms unless the context clearly indicates otherwise. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more associated listed items.

[0038] In order to facilitate understanding of the technical solution of the present disclosure, the antenna and electronic device of the present disclosure are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the features of the following embodiments and implementations can be combined with each other.

[0039] See also Figure 1 and Figure 2 As shown, the embodiment of the present disclosure provides an antenna, which can be applied to electronic products such as mobile phones, tablet computers, laptops, smart glasses, smart watches, smart bracelets, wearable devices, etc. The antenna includes: a metal shell 10 and a conductive bracket 23 connected to the metal shell 10. The conductive bracket 23 and the metal shell 10 are surrounded to form a cavity 41, and the cavity 41 includes two adjacent openings ( Figure 2 (represented by A and B in the figure), the feeding point of the antenna is located at the junction of the two openings. The antenna also includes a tuner, which is arranged on any side of the opening and maintains a set distance from the center position of the circumference of the two openings. It can be understood that the feeding point is generally arranged near the center position of the half-wave, and the antenna efficiency is stimulated to be higher. Therefore, the feeding point is designed to be adjacent to the two openings, that is, the center position of the two openings, to ensure the optimal solution for antenna efficiency. The tuner can be loaded on the side of opening A, or at an appropriate position on the side of opening B, or one tuner can be set on the side of opening A and one tuner can be set on the side of opening B. Among them, the center position of the circumference close to the two openings A+B is the current strong point part of the entire half wavelength. Close to the current strong point part, the sensitivity of switch tuning is low. As the loading position of the tuner gradually moves away from the center position of the two openings A+B, the sensitivity of tuner tuning gradually increases. For the same capacitance distribution matching, or the same inductance distribution matching, the higher the tunable sensitivity is, the greater the corresponding frequency shift will be. Optionally, the set distance is greater than or equal to 4 mm and less than or equal to 10 mm, preferably 4-5 mm.

[0040] It can be seen from the above embodiments that the antenna disclosed in the present invention is enclosed by a conductive bracket and a metal shell to form a cavity with two adjacent openings, and the feeding point of the antenna is located at the junction of the two openings, thereby forming a semi-cavity antenna (which can be understood as a semi-cavity model healthy antenna). Compared with the cavity antenna with only one opening in the related art, it can not only meet the same low-frequency usage, but also reduce the size of the antenna and the occupied volume, reducing costs and mass production risks. In addition, the tuner is set on either side of the opening and maintains a set distance from the center position of the perimeter of the two openings, avoiding the center position of the half-wave, that is, the current strong point area, and the tunable sensitivity is high. Optionally, the size of the cavity antenna with only one opening in the related art is generally 155mm*40mm. By adopting the technical solution disclosed in the present invention, the size of the antenna can be reduced to 90mm*40mm, reducing the use volume of the antenna by 42%, and can greatly reduce the size of the antenna cavity antenna, which greatly helps to reduce the volume occupied by the antenna with the cavity in a limited space.

[0041] See also Figure 3 As shown, in some optional embodiments, the tuner includes a matching circuit, the matching circuit includes a switch component 60, and the switch component 60 includes a plurality of tuning branches 61 connected in parallel. By controlling the closed state of each of the tuning branches 61, the antenna is tuned to cover different frequency bands. In the figure, FR1 to FR4 correspond to different frequency ranges, respectively. Among them, FR1 may refer to the sub-6GHz frequency band, and FR2 may refer to the 24GHz-100GHz frequency band. FR3 has a higher frequency band, between 30GHz-300GHz. FR4 may refer to a low frequency band of 1-2GHz. In the figure, VIO is a voltage power supply port, ID is a chip identity authentication interface, and SDATA and SCLK are two mipi control line interfaces, respectively. The matching circuit can supply power to the switch component and control signals such as mipi by pulling control lines FPC or LCP.

[0042] It should be noted that, as a whole, the choice of cavity size of the antenna disclosed in the present invention is inversely proportional to the working frequency. In this embodiment, taking the use of low frequency 700M~960M as an example, the cavity size can be set to 90mm*40mm. In practice, the length and width of the cavity size can be adjusted according to the corresponding frequency band used to achieve the adjustment of the corresponding frequency, and the use of the switch is similar. For example, if the 1700M frequency band is needed, the cavity size can be reduced from the current 90mm*40mm to 60mm*35mm or 50mm*40mm. If a higher frequency is required, the length and width of the corresponding cavity size need to continue to be reduced to a reasonable size. Similarly, if the corresponding frequency is lower, the length and width of the cavity size need to be appropriately increased.

[0043] See also Figure 4As shown, in some optional implementations, the matching circuit further includes: a first inductor L1, a first capacitor C1, a second inductor L2, and a second capacitor C2. Looking from the antenna to the feed source, the matching form of the matching circuit is: the first inductor L1 connected to the ground in parallel, then connected in parallel with the switch component 60, then connected in series with the first capacitor C1, then connected in series with the second inductor L2, and then connected in parallel with the second capacitor C2 connected to the ground.

[0044] Optionally, there are four tuning branches (represented by 1234 in the figure), and each of the tuning branches is provided with a grounded tuning element 42, and the tuning element is any one of a capacitor and an inductor. In this embodiment, the tuning element 42 of the tuning branch 1 adopts the third capacitor C3, the tuning element 42 of the tuning branch 2 adopts the fourth capacitor C4, the tuning element 42 of the tuning branch 3 adopts the third inductor L3, and the tuning element 42 of the tuning branch 4 adopts the third inductor L4. Among them, the inductance values ​​of the first inductor L1, the second inductor L2, the third inductor L3 and the fourth inductor L4, and the capacitance values ​​of the first capacitor C1, the second capacitor C2, the third capacitor C3 and the fourth capacitor C4 are as follows Figure 4 shown.

[0045] Taking the low frequency 700M~960M as an example, this embodiment can achieve full coverage of the low frequency band by loading different distributed capacitors and distributed inductors on the matching circuit through series and parallel connection. By controlling the closed state of different tuning branches of the matching circuit, different switch matching (such as Figure 5 The cavity antenna position loading points 1 / 2 / 3 / 4 indicated in the figure can achieve broadband coverage of the low frequency band from 700M to 960M, thus meeting the design frequency band requirements. The initial position can be understood as the state where all tuning branches are disconnected.

[0046] See also Figure 6 As shown, in some optional embodiments, the metal housing 10 is provided with an electrical device 50, and the conductive bracket 23 is provided with a through hole 24 at a position corresponding to the electrical device 50. Optionally, when the antenna is applied to electronic devices such as mobile phones, the electrical device 50 may include a speaker (SPK box) or other electronic devices inside the electronic device, which is not limited in the present disclosure.

[0047] When the antenna is used in electronic devices such as mobile phones, it may conflict with the position of the electrical device set on the metal shell. The current is concentrated at the magnetic steel of the electrical device, which will affect the antenna performance. The present invention can effectively retain the circuit path of the electrical device itself ( Figure 6The dashed box in the middle shows the partial edge current path of the electrical device), the current direction and the potential length, which can also reduce the impact of the electrical device on the antenna. Through the technical solution disclosed in this disclosure, the size of the antenna cavity can be 155mm long, 40mm wide and 3mm high, forming a low-frequency cavity mode antenna that can adapt to many antenna frequency bands.

[0048] In some optional embodiments, the metal shell 10 is provided in a receiving cavity corresponding to the position of the electrical device 50, and the electrical device 50 is embedded in the receiving cavity. In this way, by embedding the electrical device 50 in the receiving cavity, the space inside the cavity 41 occupied by the electrical device 50 (that is, the internal space of the antenna body) can be reduced, thereby further reducing the impact of the electrical device on the antenna performance. It can be understood that the number of electrical devices 50 can be one or more, and accordingly, the number of through holes 24 corresponds to the number of electrical devices 50, and the number of receiving cavities corresponds to the number of electrical devices 50, so that the conductive bracket 23 can avoid each electrical device 50.

[0049] The surface of the electrical device 50 does not protrude from the accommodating cavity. In this way, the electrical device 50 does not occupy the space inside the cavity 41 at all. Alternatively, the surface of the electrical device 50 is flush with the surface of the metal shell 10. In this way, no depression is formed on the surface of the metal shell 10, and the internal space of the antenna body can be as regular and complete as possible, which is conducive to improving the antenna performance.

[0050] In some optional embodiments, the area of ​​the through hole 24 is larger than the area of ​​the accommodating cavity, and the projection of the through hole 24 on the metal shell 10 covers the accommodating cavity. In this way, the through hole 24 can completely avoid the accommodating cavity and the electrical device 50 disposed in the accommodating cavity, and the influence of the electrical device 50 on the antenna can be minimized. Optionally, the spacing distance between the outer edge of the projection of the through hole 24 on the metal shell 10 and the outer edge of the accommodating cavity is not less than 2 mm, so that the conductive bracket 23 can effectively avoid the inner core space of the electrical device 50 and reduce the influence of the electrical device on the antenna. It can be understood that the surface of the conductive bracket 23 can be paved with a copper sheet as a conductive layer, and the through hole 24 can avoid the copper sheet around the electrical device by more than 2 mm through the above-mentioned size design, thereby reducing the influence and interference on the antenna.

[0051] See also Figure 7As shown, in some optional embodiments, the electrical device 50 is provided with a flexible circuit board 51, and at least one magnetic bead 52 is provided on the flexible circuit board 51, which can solve the crosstalk problem between the electrical device and the antenna and further reduce the influence of the electrical device on the antenna. It can be understood that the magnetic bead has a high resistivity and magnetic permeability, which is equivalent to the series connection of resistance and inductance, and can be used to absorb ultra-high frequency signals, eliminate RF noise existing in the transmission line structure (circuit), suppress high-frequency noise and spike interference on the signal line and power line, and also has the ability to absorb electrostatic pulses. Optionally, the flexible circuit board 51 can be arranged on the side of the electrical device 50 facing away from the conductive bracket 23, and arranged close to the metal shell. The magnetic bead 52 can be connected in series in the circuit of the flexible circuit board 51. For example, when the flexible circuit board 51 has a wiring, the wiring is connected in series with a magnetic bead 52. When the flexible circuit board 51 has multiple wirings, each wiring is connected in series with a magnetic bead 52. In this embodiment, the flexible circuit board 51 has two wirings, and the number of magnetic beads 52 is two. It should be noted that the number of magnetic beads 52 can be set according to actual needs, and the present disclosure does not impose any limitation on this.

[0052] See also Figure 1 , Figure 8 and Fig. 9 As shown, Figure 8 It is a schematic diagram of the back side of the bracket and the conductive layer according to an exemplary embodiment, that is, the side of the conductive layer facing the metal shell. Fig. 9 It is a front schematic diagram of a bracket and a conductive layer according to an exemplary embodiment, that is, the side of the conductive layer facing away from the metal shell. In some optional embodiments, the conductive bracket 23 may include a bracket 20 and a conductive layer 30 wrapped in the bracket 20, and the through hole 24 passes through the conductive layer 30 and the bracket 20. The conductive layer 30 is connected to the metal shell 10, and the bracket 20, the conductive layer 30 and the metal shell 10 are enclosed to form the cavity 41. The structural form of the conductive layer can increase the flexibility of antenna performance debugging in the research and development stage and shorten the proofing cycle. Optionally, the bracket 20 may include a plastic bracket or a bracket of other insulating materials, which can support the conductive layer 30 and increase the stability of the conductive layer 30. The conductive layer 30 may include a flexible printed circuit (FPC) or other conductive layers, such as LDS (Laser-Direct-structuring) laser forming process layer, PDS (Printing Direct Structure) pad printing process layer, etc.

[0053] In some optional embodiments, the conductive layer 30 includes a main body 31 and a bending portion 32, the main body 31 is wrapped around the bracket 20, the main body 31 leaves adjacent edges on both sides empty, the bending portion 32 is formed on the other edges of the main body 31 and is bent toward the metal shell 10, and the bending portion 32 is connected to the metal shell 10. The main body 31, the bracket 20, the bending portion 32 and the metal shell 10 enclose the cavity 41, and two openings are formed between the adjacent edges on both sides of the main body 31 and the metal shell 10. Optionally, the metal shell 10 may include a bottom wall 11 and a side wall 12 connected to the bottom wall 11, and the conductive layer 30 is connected to the bottom wall 11. The bottom wall 11 and the side wall 12 may be an integrally formed arrangement to form a unibody metal back shell. It should be noted that the size of the opening can also be adjusted according to actual needs to match different antenna frequency bands. For example, the edge of the main body near the opening can be further bent to form a smaller bent portion, so as to change and control the length and width of the opening, and the degree of bending can be set according to actual needs.

[0054] Optionally, the bracket 20 is rectangular, the main body 31 of the conductive layer 30 is rectangular, the edges of the three sides of the main body 31 are bent toward the metal shell 10 to form a bent portion 32 and connected to the metal shell 10, and an opening is reserved on the other side edge, thereby realizing a structural form in which the three sides of the conductive layer are connected to the metal shell and one side has an opening reserved, forming a completely sealed cavity, thereby improving the overall antenna cavity performance.

[0055] In some optional embodiments, the bending portion 32 includes a first bending section 321 and a second bending section 322. The first bending section 321 is bent from the main body 31 along the first direction Y, and the second bending section 322 is bent from the first bending section 321 along the second direction X. The second bending section 322 is connected to the metal shell 10. In this way, the connection between the conductive layer and the metal shell is achieved through the structural form of the bending portion. In addition, the design of the bending portion can increase the flexibility of debugging and reduce the proofing cycle. Optionally, the first direction Y is perpendicular to the second direction X, and the first direction Y is perpendicular to the second direction X. Figure 1 The direction shown in can be understood as the longitudinal direction, and the second direction X is Figure 1 The view shown in can be understood as being horizontal.

[0056] Furthermore, the second bending section 322 is provided with a plurality of first conductive connectors 33 at intervals along the length direction, and the first conductive connector 33 is connected to the metal shell 10, that is, the first conductive connector 33 is connected between the second bending section 322 and the metal shell 10, so as to realize the electrical connection between the conductive layer 30 and the metal shell 10. The main body 31, the bracket 20, the first bending section 321, the second bending section 322, the first conductive connector 33 and the metal shell 10 enclose the cavity 41. In this way, the conductive layer is connected to the metal shell through the first conductive connector, which can improve the sealing and reliability of the electrical connection. Optionally, the first conductive connector 33 can be a gold-plated conductive foam, conductive silicone, conductive cloth, conductive shrapnel, etc. pasted on the second bending section 322 of the conductive layer 30. It can be understood that the conductive layer 30 is in contact with the metal shell 10 through the first conductive connector 33 to achieve electrical connection between the conductive layer 30 and the metal shell 10, forming a cavity 41 surrounded by the conductive layer 30, the first conductive connector 33 and the metal shell 10 in a narrow space.

[0057] Optionally, the bending portion 32 surrounds the other edges of the main body 31 except the edges on both sides corresponding to the two openings. The bending portion 32 is provided with a plurality of first conductive connectors 33 at intervals along the length direction, and the first conductive connectors 33 are connected to the metal shell 10, so as to realize the electrical connection between the conductive layer 30 and the metal shell 10. The main body 31, the bracket 20, the bending portion 32, the first conductive connector 33 and the metal shell 10 enclose the cavity 41. The first conductive connector 33 can be one or more. When there are multiple first conductive connectors 33, the multiple first conductive connectors 33 can be arranged at intervals corresponding to the edges of the main body 31 of the conductive layer 30 except the edges corresponding to the two openings, so as to surround the cavity mode antenna and improve the antenna performance. When there is one first conductive connector 33, the first conductive connector 33 surrounds the edges of the main body 31 of the conductive layer 30 except the edges corresponding to the two openings in a ring shape. For example, the bracket 20 is rectangular, the main body 31 of the conductive layer 30 is rectangular, the three edges of the main body 31 are bent toward the metal shell 10 to form a bent portion 32 and connected to the metal shell 10, and an opening is reserved at the edge of the other side, and the bent portion 32 surrounds the other three edges of the main body 31 except the edges corresponding to the two openings. The first conductive connector 33 is correspondingly connected between the bent portion 32 and the metal shell 10 in a ring shape, which can improve the sealing and reliability and stability of the electrical connection.

[0058] In some optional embodiments, the bracket 20 includes a first surface and a second surface opposite to the first surface, and the first surface is arranged opposite to the metal shell 10 compared to the second surface. The main body 31 is wrapped around the first surface, and the bent portion 32 extends from one side of the first surface to one side of the second surface and at least partially protrudes from the second surface. It can be understood that the first surface is the side away from the metal shell, and the second surface is the side close to the metal shell. The conductive layer 30 is wrapped around the side of the bracket 20 away from the metal shell 10. After the bent portion 32 is bent from the main body 31, the bracket 20 is wrapped in the middle to improve the stability of the bracket and the conductive layer.

[0059] In some optional embodiments, the metal shell 10 includes a bottom wall 11 and a side wall 12 connected to the bottom wall 11, the electrical device 50 is arranged on the bottom wall 11, and the bottom wall 11 can be provided with the accommodating cavity. The cavity 41 formed by the conductive layer 30 and the metal shell 10 can be arranged in an area of ​​the bottom wall 11 that is not close to the side wall 12, and the conductive layer 30 cooperates with the bottom wall 11 to form the cavity 41. The cavity 41 formed by the conductive layer 30 and the metal shell 10 can also be arranged in a corner area of ​​the bottom wall 11 close to the side wall 12, and the conductive layer 30 cooperates with the bottom wall 11 and the side wall 12 to form the cavity 41. The following situations may be included:

[0060] (1) The main body 31 may be rectangular, with the main body 31 leaving two adjacent edges, and the other two adjacent edges of the main body 31 are formed with a first bend and a second bend in sequence, and the first bend and the second bend are both connected to the metal shell 10. The main body 31, the bracket 20, the first bend, the second bend, the third bend, and the metal shell 10 together form the cavity 41. It can be understood that the first bend and the second bend are both connected to the bottom wall 11. The main body 31, the first bend, the second bend, and the bottom wall 11 together form the cavity 41. That is, the cavity 41 is arranged in an area of ​​the bottom wall 11 that is not close to the side wall 12. The bends formed on the edges of the two sides of the main body 31 are connected to the bottom wall 11, forming a semi-cavity structure with two conductive layers and one shell.

[0061] (2) The main body 31 may be rectangular, and a first bending portion is formed on the first side edge of the main body 31, the first bending portion is connected to the bottom wall 11, the main body 31 is connected to the second side adjacent to the first side and the side wall 12, and the main body 31 leaves the third side edge and the fourth side edge adjacent to each other empty. The main body 31, the bracket 20, the first bending portion, the side wall 12 and the bottom wall 11 enclose the cavity 41. That is, the cavity 41 is arranged in the corner area of ​​the bottom wall 11 close to the side wall 12. A bending portion is formed on one edge of the main body 31 and connected to the bottom wall 11, forming a semi-cavity structure with a conductive layer on one side and a shell on both sides.

[0062] See also Fig.10 and Fig.11 As shown, in some optional embodiments, the tuner includes a tuning circuit board 44, and the tuning circuit board 44 is provided with a connecting line 43 for connecting an external device, and the tuning circuit board 44 can be connected to the first conductive connector 33 located on any opening side. The tuning circuit board 44 can tune the semi-cavity phantom healthy antenna. When the antenna is applied to electronic devices such as mobile phones, the tuning circuit board 44 can be connected to the motherboard of the electronic device through the connecting line 43 to achieve a signal link between the antenna and the motherboard. Optionally, the tuning circuit board 44 can be a printed circuit board (PCB, Printed Circuit Board), and the connecting line 43 can be a cable line.

[0063] Combination Figure 1 and Figure 8 As shown, in some optional embodiments, the bracket 20 is provided with a notch portion 21 corresponding to the adjacent portion of the two openings, and the conductive layer 30 is provided with a second conductive connector 34 corresponding to the notch portion 21. It can be understood that the main body 31 does not form an edge of the bending portion 32, that is, the second conductive connector 34 is provided at the edge of the main body 31 corresponding to the two openings, and the second conductive connector 34 can be used as a feeding point for the antenna. Optionally, the size of the notch portion 21 can be 3*5mm, and the second conductive connector 34 can be a metal shrapnel, a grounding shrapnel, etc. Further, the second conductive connector 34 can be connected to the metal shell 10, and while serving as an antenna feeding point, it also serves as a support for the conductive layer 30, thereby increasing the stability of the conductive layer 30.

[0064] Combination Figure 8 and Fig. 9 As shown, in some optional embodiments, the bracket 20 is provided with at least one connection hole 22 along the circumferential direction, and the antenna further includes a fastener (not shown), which is passed through the connection hole 22 and connected to the metal shell 10, so as to fix the bracket 20 to the metal shell 10 and ensure the electrical connection stability between the conductive layer 30 and the metal shell 10. Optionally, the connection hole 22 is set about 1 mm away from the conductive layer 30. The connection hole 22 can be a screw hole, and the fastener can be a screw. In the figure, four connection holes 22 are taken as an example.

[0065] Combination Figure 1 and Fig. 9 As shown, Fig. 9The area 100 in the figure is the antenna area. In some optional embodiments, a third conductive connector 36 is provided on the side of the conductive layer 30 away from the metal shell 10, and the third conductive connector 36 is provided corresponding to the two openings. Optionally, the third conductive connector 36 can be provided on the same side as the second conductive connector 34, and the distance from the edge and the second conductive connector 34 is within 3 mm, so as to be close to the feeding point and realize a shorter conductive path.

[0066] When the antenna is applied to an electronic device with a display screen, the third conductive connector 36 can be used to connect to the display screen to play a grounding role, thereby reducing clutter, reducing interference to the display screen, and improving the efficiency of the antenna. Optionally, the third conductive connector 36 and the second conductive connector 34 are overlapped along the thickness direction of the conductive layer 30, so that the grounding point is set close to the feeding point, and the conductive path formed is the shortest. The third conductive connector 36 can be a conductive foam, conductive silicone, conductive cloth, conductive shrapnel, etc. pasted on the conductive layer 30. The number of the third conductive connector 36 can be one or more, and it is arranged according to the antenna performance requirements.

[0067] In some optional embodiments, the antenna of the present disclosure can achieve different frequency changes by adjusting the size of the main body of the bracket and the conductive layer. Specifically, as the size of the main body of the bracket and the conductive layer decreases, the resonant frequency changes from low to high. Taking the main body of the bracket and the conductive layer as a rectangle as an example, adjusting the size of the main body of the bracket and the conductive layer mainly refers to adjusting the length of the main body of the bracket and the conductive layer, and then adjusting the width of the main body of the bracket and the conductive layer. In the above manner, the resonant frequency of the antenna can be achieved from 0.5G to 10G.

[0068] See also Fig.12 and Fig.13 As shown in the figure, the radiation efficiency and passive efficiency diagram of the antenna of the present invention are obtained through simulation. The low-frequency measured performance is about -7dB (such as Fig.12 The performance is satisfactory. Figure 6 and Fig.14 As shown, Fig.14 The current distribution diagram of the antenna of the present invention is shown. It can be seen that the antenna of the present invention adopts the above technical solution, and the edge currents on both sides of opening A and opening B are the main mode, and the sealing edges C and D form a low-frequency current along the cavity surface to the feeding point, forming a low-frequency current mode together. It is equivalent to a half-wave mode from side A to side B. The half-wave resonant frequency is inversely proportional to the length of the side A+B.

[0069] As shown in Table 1 below, by adopting the antenna solution of the embodiment of the present disclosure, the Specific Absorption Ratio (SAR) value is low, and the SAR measured in the pad scenario can meet the regulatory requirements without SAR reduction, so there is no need to reduce the antenna transmission power, which greatly improves the user's signal experience.

[0070]

[0071] Table 1

[0072] See again Figure 1 As shown, the embodiment of the present disclosure also provides an electronic device, which may be, for example, an electronic product such as a mobile phone, a tablet computer, a laptop computer, a wearable device, a smart bracelet, a smart watch, smart glasses, etc. The electronic device includes a display screen 90 and an antenna. It should be noted that the antenna described in the above embodiments and implementation methods is also applicable to the electronic device of this embodiment. The display screen 90 is disposed on the metal shell 10 and is connected to the conductive bracket 23 of the antenna. Optionally, the display screen 90 can be connected to the conductive layer 30 of the conductive bracket 23, and the display screen 90 and the conductive layer 30 can be connected through the third conductive connector 36. The third conductive connector 36 plays a grounding role, thereby reducing clutter, reducing interference to the display screen, and improving the efficiency of the antenna.

[0073] It can be seen from the above embodiments that the electronic device disclosed in the present invention adopts the above antenna, and a cavity with two adjacent openings is formed by enclosing a conductive bracket and a metal shell. The feeding point of the antenna is located at the junction of the two openings, thereby forming a semi-cavity antenna (which can be understood as a semi-cavity healthy antenna). Compared with the cavity antenna with only one opening in the related art, it can not only meet the same low-frequency usage, but also reduce the size of the antenna and the occupied volume, thereby reducing costs and mass production risks. In the antenna structure disclosed in the present invention, the cavity position is preferably designed to be in the corner of the electronic device to ensure the double-sided opening.

[0074] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the disclosure disclosed herein. The present disclosure is intended to cover any variations, uses, or adaptations of the present disclosure that follow the general principles of the present disclosure and include common knowledge or customary techniques in the art that are not disclosed in the present disclosure. The description and examples are to be considered exemplary only, and the true scope and spirit of the present disclosure are indicated by the following claims.

[0075] It should be understood that the present disclosure is not limited to the exact structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. An antenna, characterized in that: include: A metal shell and a conductive bracket connected to the metal shell, wherein the conductive bracket and the metal shell enclose a cavity, the cavity includes two adjacent openings, and the feeding point of the antenna is located at the adjoining position of the two openings; The antenna further comprises a tuner, which is arranged on any side of the opening and keeps a set distance from the center position of the perimeter of the two openings.

2. The antenna according to claim 1, characterized in that The tuner comprises a matching circuit, the matching circuit comprises a switch component, and the switch component comprises a plurality of tuning branches connected in parallel; the antenna is tuned to cover different frequency bands by controlling the closed state of each of the tuning branches.

3. The antenna according to claim 2, characterized in that: The matching circuit further includes: a first inductor, a first capacitor, a second inductor and a second capacitor; Viewed from the antenna toward the feed source, the matching form of the matching circuit is: the first inductor connected to the ground in parallel, the switch component connected in parallel, the first capacitor connected in series, the second inductor connected in series, and the second capacitor connected to the ground in parallel.

4. The antenna according to claim 2 or 3, characterized in that: There are four tuning branches, each of which is provided with a grounded tuning element, and the tuning element is any one of a capacitor and an inductor.

5. The antenna according to claim 1, characterized in that The set distance is greater than or equal to 4 mm and less than or equal to 10 mm.

6. The antenna according to claim 1, characterized in that The conductive bracket includes a bracket and a conductive layer wrapped around the bracket; the conductive layer is connected to the metal shell, and the bracket, the conductive layer and the metal shell enclose the cavity.

7. The antenna according to claim 6, characterized in that The conductive layer includes a main body and a bent portion, the main body is wrapped around the bracket, the main body leaves two adjacent edges empty, the bent portion is formed at the other edges of the main body and is bent toward the direction of the metal shell, and the bent portion is connected to the metal shell; The main body, the bracket, the bent portion and the metal shell are enclosed to form the cavity, and two openings are formed between adjacent two side edges of the main body and the metal shell.

8. The antenna according to claim 7, characterized in that: It also includes a plurality of first conductive connecting members connected between the bending portion and the metal shell; the tuner is connected to one of the first conductive connecting members.

9. The antenna according to claim 1, characterized in that: The tuner includes a tuning circuit board, and the tuning circuit board is provided with connection lines for connecting external devices.

10. An electronic device, characterized in that: It comprises a display screen and the antenna according to any one of claims 1 to 9, wherein the display screen is arranged on the metal shell and connected to the conductive bracket.

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