Antenna structure and mobile device having the same

Abstract

The application discloses an antenna structure and a mobile device with the same. The antenna structure comprises a metal frame, a slit is formed on the metal frame, and the metal frame on opposite sides of the slit is formed into a first antenna and a second antenna respectively; a coupling member is arranged on the inner side of the metal frame and opposite to the slit inside and outside, the coupling member comprises a first coupling part, a second coupling part and a third coupling part, the first coupling part extends along the width direction of the metal frame, and the projection of the first coupling part on the metal frame corresponds to the slit in the width direction of the metal frame, and the second coupling part and the third coupling part are connected to the two ends of the first coupling part in the width direction of the metal frame and extend along a plane substantially perpendicular to the width direction of the metal frame. According to the antenna structure, the problem of frequency band efficiency depression caused by high-order modes generated by the mutual influence of the first antenna and the second antenna can be offset, and a new resonance mode can be generated in the high frequency band, so that the bandwidth is expanded.

Description

Technical Field

[0001] This invention relates to the field of antenna technology, and in particular to an antenna structure and a mobile device having the same. Background Technology

[0002] With increasingly fierce competition in the mobile phone industry, the rapid development of MIMO (Multiple Input Multiple Output) wireless communication technology and the increasing intelligence of mobile phones, the number of antennas required and the integrated functions of mobile phones are increasing daily. This leaves less internal space for mobile phone antennas and a more complex electromagnetic environment. The appearance of mobile phones has also become a highly important feature, making reducing the number of gaps in the phone's bezel a major challenge in current mobile phone antenna design.

[0003] In related technologies, a common solution for saving on slots in mobile phone antennas is to use two head-to-head IFA antennas (Inverted-F Antennas) on one side of the metal frame, so that the two antennas share a single slot for radiation. However, since the two IFA antennas share a single slot, they have strong mutual influence, generating higher-order modes that result in poor efficiency at high frequencies. Summary of the Invention

[0004] The present invention aims to at least solve one of the technical problems existing in the prior art. To this end, the present invention proposes an antenna structure that can avoid the efficiency dip in the frequency band caused by the higher-order modes generated when two antennas share a single slot, and can also generate new resonant modes, thus expanding the bandwidth.

[0005] The present invention also proposes a mobile device having the above-described antenna structure.

[0006] According to a first aspect of the present invention, an antenna structure includes: a metal frame having a slit formed thereon, wherein a first antenna and a second antenna are respectively formed on opposite sides of the slit on the metal frame; and a coupling member disposed on the inner side of the metal frame and facing the slit, the coupling member being used to couple with the first antenna and the second antenna during operation, the coupling member including a first coupling portion, a second coupling portion and a third coupling portion, the first coupling portion extending along the width direction of the metal frame, and the projection of the first coupling portion on the metal frame corresponding to the slit in the width direction of the metal frame, the second coupling portion and the third coupling portion being respectively connected to both ends of the first coupling portion in the width direction of the metal frame and extending along a plane substantially perpendicular to the width direction of the metal frame.

[0007] According to the antenna structure of the present invention, by providing a coupling element at the slot location for mutual coupling with the first and second antennas on both sides of the slot, a current can be generated to counteract the efficiency dip in the frequency band caused by the high-order modes generated by the mutual influence of the first and second antennas. Furthermore, new resonant modes can be generated in the high-frequency band, expanding the bandwidth. In short, the antenna structure of this embodiment, while ensuring antenna performance, can reduce slots, improve aesthetics, and simultaneously cover ultra-wide bandwidth and multiple frequency bands, realizing MIMO wireless communication technology.

[0008] In some embodiments, the distance between the first coupling portion and the metal frame is less than or equal to 3 mm.

[0009] In some embodiments, in the width direction of the gap, the length of the first coupling portion is greater than or equal to twice the width of the gap.

[0010] In some embodiments, in the width direction of the gap, the first coupling portion is located between the feed point of the first antenna and the feed point of the second antenna.

[0011] In some embodiments, the width of the gap is in the range of 1mm-2.5mm.

[0012] In some embodiments, the third coupling portion connects the circuit board back to ground via a spring clip.

[0013] In some embodiments, a capacitor is connected in series between the spring and the circuit board.

[0014] In some embodiments, the antenna structure further includes: a bracket disposed inside the metal frame, a coupling member disposed on the bracket, a first coupling portion located on the side wall of the bracket, a second coupling portion located on the upper surface of the bracket, and a third coupling portion disposed on the lower surface of the bracket.

[0015] In some embodiments, the coupling element is formed onto the bracket using laser direct forming technology.

[0016] In some embodiments, the third coupling portion is grounded via a connecting circuit board, and the second coupling portion has a connecting portion extending toward the third coupling portion, the connecting portion passing through the bracket and connected to the third coupling portion.

[0017] In some embodiments, when the first antenna is in operation, it covers the B1 / 3 / 4 / 7 bands of LTE and the Wifi-2.4G band, and when the second antenna is in operation, it covers the N77 / 79 bands of NR and the Wifi-5G band.

[0018] In some embodiments, both the first antenna and the second antenna are inverted-F antennas.

[0019] A mobile device according to a second aspect of the present invention includes an antenna structure according to a first aspect of the present invention.

[0020] According to the mobile device of the present invention, by providing the antenna structure described in the first aspect, the overall performance of the mobile device is improved.

[0021] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the antenna structure according to an embodiment of the present invention in the xy plane;

[0023] Figure 2 yes Figure 1 A schematic diagram of the antenna structure shown in the yz plane;

[0024] Figure 3 This is a schematic diagram of an antenna structure from one angle according to an embodiment of the present invention;

[0025] Figure 4 yes Figure 3 A schematic diagram of the antenna structure shown from another angle;

[0026] Figure 5 yes Figure 3 A schematic diagram of the antenna structure shown from another angle;

[0027] Figure 6 This is a schematic diagram of an antenna structure in the prior art;

[0028] Figure 7 This is a schematic diagram comparing the CST simulation radiation efficiency of the antenna structure of the present invention embodiment with that of the antenna structure in the prior art within the frequency range of 1GHz-3GHz. The dashed line represents the antenna structure in the prior art without a coupling element, and the solid line represents the antenna structure of the present invention embodiment with a coupling element.

[0029] Figure 8 This is a schematic diagram comparing the CST simulation radiation efficiency of the antenna structure of this invention embodiment with that of the prior art antenna structure in the frequency range of 3GHz-7.5GHz. The dashed line represents the antenna structure in the prior art without a coupling element, and the solid line represents the antenna structure of this invention embodiment with a coupling element.

[0030] Figure label:

[0031] Antenna structure 100,

[0032] Metal frame 1, gap 101, first antenna 11, second antenna 12.

[0033] Coupler 2, first coupling part 21, second coupling part 22, third coupling part 23, connecting part 221, through hole 222.

[0034] 3. Bracket; 4. Spring clip; 5. Phone frame. Detailed Implementation

[0035] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0036] The following is for reference. Figures 1-5 An antenna structure 100 according to a first aspect embodiment of the present invention is described, which can be used in mobile devices such as mobile phones and tablets.

[0037] like Figure 1 As shown, the antenna structure 100 according to a first aspect embodiment of the present invention includes: a metal frame 1 and a coupling member 2.

[0038] Specifically, a slit 101 is formed on the metal frame 1, and a first antenna 11 and a second antenna 12 are respectively formed on opposite sides of the metal frame 1 at the slit 101. Optionally, the difference between the operating frequency band of the first antenna 11 and the operating frequency band of the second antenna 12 is not less than 1 GHz.

[0039] That is, a first antenna 11 and a second antenna 12 are formed on the metal frame 1, and a gap 101 is formed between the first antenna 11 and the second antenna 12. At this time, the first antenna 11 and the second antenna 12 are located on opposite sides of the gap 101, and the first antenna 11 and the second antenna 12 share the gap 101 for radiating outward through the gap 101 to realize the transmission and reception of signals.

[0040] The first antenna 11 operates at a different frequency band than the second antenna 12. In other words, the frequency band covered by the first antenna 11 when it is working is completely different from the frequency band covered by the second antenna 12 when it is working. Thus, the first antenna 11 and the second antenna 12 cover different operating frequency bands, which allows the antenna structure 100 to cover more frequency bands at the same time and expand the bandwidth.

[0041] Furthermore, the difference between the operating frequency band of the first antenna 11 and the operating frequency band of the second antenna 12 is greater than or equal to 600MHz. For example, when the operating frequency band of the first antenna 11 is 2.7GHz or below, then the operating frequency band of the second antenna 12 is at least 3.3GHz or above. In some specific embodiments, the difference between the operating frequency band of the first antenna 11 and the operating frequency band of the second antenna 12 can be 800MHz, 1GHz, 1.5GHz, 2GHz, 2.5GHz, or 3GHz, etc.

[0042] Furthermore, the difference between the operating frequency band of the first antenna 11 and the operating frequency band of the second antenna 12 is greater than or equal to 1 GHz. For example, when the operating frequency band of the first antenna 11 is 2 GHz or below, then the operating frequency band of the second antenna 12 is at least 3 GHz or above; or, when the operating frequency band of the first antenna 11 is 2.7 GHz or below, then the operating frequency band of the second antenna 12 is at least 3.7 GHz or above.

[0043] like Figure 1 and Figure 2 As shown, the coupling element 2 is located on the inner side of the metal frame 1, and the coupling element 2 is opposite to the gap 101 inside and out. The coupling element 2 is used to couple with the first antenna 11 and the second antenna 12 when the first antenna 11 and the second antenna 12 are working.

[0044] Specifically, the coupling member 2 includes a first coupling portion 21, a second coupling portion 22, and a third coupling portion 23. The first coupling portion 21 is along the width direction of the metal frame 1 (e.g., Figure 2 As shown, it extends in the z-direction, and the projection of the first coupling portion 21 on the metal frame corresponds to the gap 101 in the width direction of the metal frame 1. For example, the projection of the first coupling portion 21 on the metal frame corresponds to the gap 101 in the width direction of the metal frame 1. Figure 2 The z-direction shown in the diagram partially or completely overlaps. It should be noted that the width direction of the metal frame 1 is the same as the thickness direction of the mobile device including the antenna structure 100, for example... Figure 2 The z-direction is shown in the diagram.

[0045] The second coupling portion 22 and the third coupling portion 23 are respectively connected to the two ends of the first coupling portion 21 in the width direction of the metal frame 1 (e.g., Figure 2 The first coupling portion 21 shown is at both ends in the z-direction, and the second coupling portion 22 and the third coupling portion 23 both extend along a plane that is generally perpendicular to the width direction of the metal frame 1. For example, the second coupling portion 22 and the third coupling portion 23 both extend along a plane that is generally perpendicular to the width direction of the metal frame 1. Figure 1 The xy plane extension shown in the figure.

[0046] For example Figure 1As shown, the plane containing the mid-frame 5 of the mobile device is the xy plane. The metal frame 1 is formed as a ring extending in the xy plane and having a gap opening. The axial direction of the ring metal frame 1 is the z-direction, and the width direction of the ring metal frame 1 is the z-direction. The first coupling part 21 extends perpendicularly to the xy plane along the z-direction. The first coupling part 21 is located on the inner side of the metal frame 1. The first coupling part 21 is directly opposite the gap 101 on the metal frame 1, and the first coupling part 21 is arranged parallel to the width direction of the gap. The first coupling part 21 is connected to the second coupling part 22 and the third coupling part 23 at its two ends in the z-direction. The second coupling part 22 extends along a plane that is generally parallel to the xy plane and is set generally perpendicular to the first coupling part 21. The third coupling part 23 extends along a plane that is generally parallel to the xy plane and is set generally perpendicular to the first coupling part 21. At this time, the cross-section of the coupling member 2 is U-shaped. The first coupling part 21 is the bottom wall of the U-shaped coupling member 2, and the second coupling part 22 and the third coupling part 23 are the two side walls of the U-shaped coupling member 2.

[0047] like Figure 5 As shown, the mobile phone antenna 100a in the related technology includes a metal frame and a mobile phone mid-frame 5a. The metal frame surrounds the mobile phone mid-frame 5a, and a first antenna 11a and a second antenna 12a are formed on the metal frame. The first antenna 11a and the second antenna 12a share a gap. When the first antenna 11a and the second antenna 12a are working, the first antenna 11a and the second antenna 12a have a relatively strong mutual influence. Specifically, the first antenna 11a and the second antenna 12a interact with each other during radiation to generate higher-order modes. These higher-order modes will cause poor radiation efficiency in the higher frequency bands covered by the first antenna 11a and the second antenna 12a, resulting in an efficiency dip within the frequency bands covered by the first antenna 11a and the second antenna 12a.

[0048] In this embodiment, a coupling element 2 is provided on the inner side of the slot 101, opposite to the slot 101. The first coupling portion 21, the second coupling portion 22, and the third coupling portion 23 of the coupling element 2 are mutually coupled with the first antenna 11 and the second antenna 12 near the slot 101 to generate current. This current can offset the efficiency dip in the frequency band caused by higher-order modes in related technologies. In addition, the coupling element 2 can also be mutually coupled with one of the first antenna 11 and the second antenna 12 covering a higher frequency band to generate a new resonant mode. In this way, the bandwidth of the antenna structure can be further extended, and higher frequency bands can be covered, solving the problem of insufficient frequency band bandwidth in existing solutions.

[0049] According to the antenna structure 100 of the present invention, by providing a coupling member 2 at the position of the slot 101 for mutual coupling with the first antenna 11 and the second antenna 12 on both sides of the slot 101, a current can be generated to offset the efficiency dip in the frequency band caused by the high-order mode generated by the mutual influence of the first antenna 11 and the second antenna 12, and a new resonant mode can be generated in the high-frequency band to expand the bandwidth.

[0050] In short, the antenna structure 100 of this embodiment, while ensuring antenna performance, can reduce gaps 101, improve appearance, and cover ultra-wide bandwidth and multiple frequency bands, thereby realizing MIMO wireless communication technology.

[0051] In one embodiment of the present invention, such as Figure 1 , Figure 2 and combined Figure 6 As shown, the first antenna 11 can be an inverted-F antenna, and the second antenna 12 can also be an inverted-F antenna. The inverted-F antenna (IFA) is a variation of the monopole antenna, which has the advantages of small size, simple structure, easy matching, and low manufacturing cost, and is widely used in short-range wireless communication fields such as Bluetooth and WiFi.

[0052] like Figure 1 and Figure 2 As shown, the first antenna 11 is an inverted-F antenna, having an antenna frame return point 111, an antenna top frame point 112, and an antenna feed point. A first matching circuit connects the antenna top frame point 112 and the antenna feed point. The second antenna 12 is also an inverted-F antenna, having an antenna frame return point 121, an antenna top frame point 122, and an antenna feed point. A second matching circuit connects the antenna top frame point 112 and the antenna feed point.

[0053] It should be noted that the evolution of the inverted-F antenna can be viewed as a process from a quarter-wavelength monopole antenna to an inverted-L antenna and then to an inverted-F antenna. Specifically, firstly, the monopole antenna is bent at 90° to obtain an inverted-L antenna, whose total length remains 1 / 4 wavelength. This deformation of the monopole antenna effectively reduces its height. However, for the inverted-L antenna, its upper half is parallel to the ground. While reducing the height, this increases the antenna's capacitance. To maintain the antenna's resonant characteristics, its inductive properties need to be increased. This is typically achieved by adding an inverted-L-shaped patch at the corner of the antenna, with one end of the patch connected to the ground via a via, thus forming the inverted-F antenna.

[0054] For example Figure 6 As shown, the inverted-F antenna is F-shaped. The inverted-F antenna has an antenna frame return point A, an antenna upper frame point B, and an antenna feed point C. The antenna upper frame point B and the antenna feed point C are connected by a matching circuit.

[0055] In related technologies, such as Figure 6 As shown, a common solution for antenna structure 100a to save on slots is to use two head-to-head IFA antennas on one side of the metal frame, allowing the two antennas to share a single slot for radiation. The IFA1 antenna can cover the B1 / 3 / 4 / 7 bands of LTE (Long Term Evolution) and the Wi-Fi 2.4G bands, while the IFA2 antenna can cover the N77 / 79 bands of NR and the Wi-Fi 5G bands. LTE is the long-term evolution of the UMTS (Universal Mobile Telecommunications System) technical standard developed by the 3GPP (The 3rd Generation Partnership Project).

[0056] However, in this scheme, the two IFA antennas share a single slot, resulting in strong mutual interference and the generation of higher-order modes, which leads to poor efficiency in the N79 and Wifi_5G bands; moreover, the insufficient bandwidth makes it difficult to cover the Wifi_6e band (5.15GHz-7.2GHz).

[0057] Therefore, when the first antenna 11 of this embodiment is working, it covers the B1 / 3 / 4 / 7 bands of LTE and the Wi-Fi-2.4G band, and when the second antenna 12 is working, it covers the N77 / 79 bands of NR and the Wi-Fi-5G band. By setting a coupling member 2 opposite to the gap 101, the first coupling part 21, the second coupling part 22, and the third coupling part 23 of the coupling member 2 are mutually coupled with the first antenna 11 and the second antenna 12 near the gap 101 to generate current. This can offset the efficiency dip in the N79 and Wi-Fi-5G bands caused by higher-order modes in related technologies. At the same time, the coupling member 2 can also generate a new resonant mode above 6GHz through mutual coupling with the second antenna 12, expanding the bandwidth and covering the Wi-Fi-6e band, thus solving the problem of insufficient bandwidth in the Wi-Fi-6e band in existing solutions.

[0058] Figure 7 and Figure 8 The diagram shows a comparison of the antenna performance of the prior art solution and the CST simulation radiation efficiency of the antenna in this embodiment. The dashed line represents... Figure 6 The existing technical solution shown is represented by the solid line. Figure 1-2 The embodiment of the present invention shown is identical in size to the first antenna 11a and the second antenna 12a in the prior art solution. The only difference between the prior art solution and the technical solution of this embodiment is that the solution of this embodiment is provided with a coupling element 2, while the prior art solution is not provided with a coupling element 2.

[0059] Depend on Figure 7 and Figure 8 As can be seen, the antenna structure 100 in this embodiment only needs to open a slit 101 on the metal frame 1 to realize an ultra-wideband antenna covering the LTE B1 / 3 / 4 / 7, N77 / 79 and Wifi 2.4G and Wifi_6e frequency bands.

[0060] According to some embodiments of the present invention, such as Figures 1-5 As shown, the antenna structure 100 may further include: a support 3, which is disposed inside the metal frame 1; a coupling member 2 is disposed on the support 3; a first coupling part 21 is located on the side wall of the support 3; a second coupling part 22 is located on the upper surface of the support 3; and a third coupling part 23 is disposed on the lower surface of the support 3. This allows for convenient placement of the coupling member 2, making it easier for the coupling member 2 to be closer to the gap 101, thereby enhancing the coupling effect between the coupling member 2 and the first antenna 11 and the second antenna 12.

[0061] In a specific example, the coupler 2 can be formed onto the bracket 3 using laser direct forming technology. For instance, the coupler 2 can be printed onto the plastic bracket 3 using LDS (Laser Direct Structuring). LDS is a 3D-MID (Three-dimensional molded interconnect device) production technology that combines laser processing, injection molding, and electroplating processes. Its principle is to integrate ordinary plastic components / circuit boards with electrical interconnection functions, component support functions, and plastic housing support and protection functions, as well as shielding and antenna functions resulting from the combination of mechanical entities and conductive patterns, forming a so-called 3D-MID. This is suitable for the fabrication of fine-line areas in IC Substrate, HDIPCB, and LeadFrame.

[0062] Of course, the coupling element 2 can also be printed on the support 3 of the plastic part through other processes, and the present invention does not impose specific limitations on this.

[0063] Preferably, the coupling element 2 is a metal part, for example, the coupling element 2 can be made of copper.

[0064] In some examples, such as Figure 1 As shown, the antenna structure 100 may further include: a mobile phone mid-frame 5, which is disposed inside the metal frame 1, and a bracket 3 disposed on the mobile phone mid-frame 5. Further, the antenna structure 100 may include a circuit board, which may be a PCB (Printed Circuit Board), and the circuit board is fixed to the mobile phone mid-frame 5.

[0065] According to some embodiments of the present invention, the coupler 2 can be grounded via a connecting circuit board (e.g., PCB, Printed Circuit Board). This allows the coupler 2 to be grounded, ensuring that the coupler 2 is coupled to the first antenna 11 and the second antenna 12, thereby suppressing efficiency dips caused by higher-order modes and extending bandwidth.

[0066] In some specific examples, such as Figure 4 and Figure 5 As shown, the third coupling part 23 is connected to the circuit board to realize the grounding connection of the coupling element 2. Further, a connecting part 221 extending toward the third coupling part 23 is formed on the second coupling part 22. The connecting part 221 passes through the bracket 3 and is connected to the third coupling part 23. In this way, the first coupling part 21 and the second coupling part 22 can both realize the grounding connection with the circuit board through the third coupling part 23, thereby ensuring the coupling effect between the first coupling part 21, the second coupling part 22 and the third coupling part 23 and the first antenna 11 and the second antenna 12, and expanding the bandwidth.

[0067] like Figure 5 As shown, a connecting portion 221 extending toward the third coupling portion 23 can be formed on the surface of the second coupling portion 22 facing the third coupling portion 23. A through hole 222 is defined on the inner side of the connecting portion 221, and the through hole 222 penetrates the connecting portion 221 in the direction from the second coupling portion 22 to the third coupling portion 23. That is, the connecting portion 221 is formed as a hollow structure, and its two ends are connected to the second coupling portion 22 and the third coupling portion 23, respectively. Since the third coupling portion 23 connects the circuit board back to ground, when the second coupling portion 22 is connected to the third coupling portion 23 through the connecting portion 221, the second coupling portion 22 can sequentially connect to the circuit board back to ground through the connecting portion 221 and the third coupling portion 23, thereby ensuring that all three parts of the coupling member 2 can be strongly coupled to the first antenna 11 and the second antenna 12.

[0068] In some embodiments, such as Figure 4 and Figure 5 As shown, the third coupling part 23 can be connected to the circuit board back to ground via the spring 4. This facilitates the connection of the third coupling part 23 to the circuit board, and because the spring 4 always has elastic force, this force ensures the electrical connection between the spring 4 and the circuit board, guaranteeing that the spring 4 is always electrically connected between the circuit board and the third coupling part 23, thereby enhancing the reliability of the ground connection of the coupling part 2.

[0069] In a specific example, a capacitor is connected in series between the spring contact 4 and the circuit board. That is, the spring contact 4 can be connected to the circuit board after being connected in series with a capacitor; for example, the spring contact 4 can be connected to the PCB ground after being connected in series with a large capacitor. In this way, the coupling element 2 not only suppresses efficiency dips caused by higher-order modes and expands bandwidth by coupling with the first antenna 11 and the second antenna 12, but also functions as a SAR (Specific Absorption Rate) sensor to detect SAR degradation on the sides and back of the phone. Therefore, this embodiment combines the SAR sensor with the antenna structure 100, achieving structural reuse and further optimizing the internal space of the phone.

[0070] In some embodiments, the width of the gap 101 between the first antenna 11 and the second antenna 12 can be in the range of 1mm-2.5mm. Preferably, the width of the gap 101 between the first antenna 11 and the second antenna 12 can be in the range of 1mm-1.5mm. With the structure of this embodiment, even when the width of the gap 101 between the first antenna 11 and the second antenna 12 is small, good radiation performance can still be obtained. For example, the width of the gap 101 can be 1mm, 1.2mm, 1.5mm, 1.8mm, 2mm, 2.2mm, or 2.4mm, etc. In this way, the radiation requirements of the antenna structure 100 for the gap 101 can be met, and the degree of mutual influence between the first antenna 11 and the second antenna 12 can be controlled. This ensures that the coupling element 2 can cancel the efficiency dip in the frequency band caused by higher-order modes and generate new resonant modes through mutual coupling with the first antenna 11 and the second antenna 12, thereby expanding the bandwidth.

[0071] Furthermore, the width of the gap 101 between the first antenna 11 and the second antenna 12 can be in the range of 1mm-1.5mm. For example, the width of the gap 101 can be 1.1mm, 1.3mm, or 1.4mm, etc. It should be noted that when the width of the gap 101 is less than 1mm, the gap 101 is too small, which will lead to stronger mutual influence between the first antenna 11 and the second antenna 12, seriously reducing the efficiency of each frequency band of the antenna structure 100 and affecting the mutual coupling effect between the coupling element 2 and the first antenna 11 and the second antenna 12. On the other hand, when the width of the gap 101 is too large, it cannot meet the requirements of the antenna structure 100 for the gap 101. Therefore, in this embodiment, the width of the slot 101 is controlled within the range of 1mm to 1.5mm, which can not only meet the radiation requirements of the antenna structure 100 for the slot 101, but also control the degree of mutual influence between the first antenna 11 and the second antenna 12. This ensures that the coupling element 2 can cancel the efficiency dip in the frequency band caused by the higher-order mode and generate new resonant modes by mutual coupling with the first antenna 11 and the second antenna 12, thereby expanding the bandwidth.

[0072] According to some embodiments of the present invention, the distance between the first coupling part 21 and the metal frame 1 is greater than 0 and less than or equal to 3 mm. That is, the surface of the first coupling part 21 facing the gap 101 is arranged separately from the inner edge of the metal frame 1, and the distance between them does not exceed 3 mm. This shortens the distance between the first coupling part 21 (coupling member 2) and the first antenna 11 and the second antenna 12, enhancing the mutual coupling effect between the first coupling part 21 (coupling member 2) and the first antenna 11 and the second antenna 12. For example, the distance between the first coupling part 21 and the metal frame 1 can be 1 mm, 1.5 mm, 2 mm, or 2.5 mm, etc.

[0073] According to some embodiments of the present invention, with reference to Figure 2 In the width direction of the slit 101, the two ends of the first coupling portion 21 extend beyond the two side walls of the slit 101 in the width direction, in other words, in the width direction of the slit 101 (e.g. Figure 2 In the y-direction shown, one end of the first coupling portion 21 facing the first antenna 11 coincides with the projection of the first antenna 11 by a first predetermined length, and the other end of the first coupling portion 21 facing the second antenna 12 coincides with the projection of the second antenna 12 by a second predetermined length. Thus, the coupling member 2 can... Figure 2 The first antenna 11 and the second antenna 12 are simultaneously covered in the y-direction shown, so as to achieve simultaneous coupling with the first antenna 11 and the second antenna 12, and ensure the strength of mutual coupling with the first antenna 11 and the second antenna 12.

[0074] Furthermore, in the width direction of the gap 101 (e.g.) Figure 2 In the y-direction shown, the length of the first coupling portion 21 is greater than or equal to twice the width of the slot 101. Therefore, by increasing the length of the first coupling portion 21, the mutual coupling effect between the first coupling portion 21 and the first antenna 11 and the second antenna 12 can be further enhanced. For example, in... Figure 2 In the y-direction, the width of the gap 101 can be d, and the length of the first coupling part 21 in the y-direction can be 2d, 2.5d, 3d, 3.5d, 4d, 5d, etc.

[0075] When the first coupling part 21 extends in the y-direction to the feed point of the first antenna 11 and / or the second antenna 12, the first coupling part 21 will couple with the feed point of the antenna. This will affect the coupling mode of the first coupling part 21 with the first antenna 11 and the second antenna 12, affect the suppression effect of the coupling element 2 on the frequency band dip and affect the generation of new resonance modes.

[0076] Therefore, further, referring to Figure 2 and Figure 6 In the width direction of the gap 101 (e.g.) Figure 2In the y-direction shown, the first coupling portion 21 is located between the feed point of the first antenna 11 and the feed point of the second antenna 12. That is, in the y-direction, the end of the first coupling portion 21 facing the first antenna 11 does not extend to the feed point of the first antenna 11, and the other end of the first coupling portion 21 facing the second antenna 12 does not extend to the feed point of the second antenna 12. This avoids coupling between the first coupling portion 21 and the feed points of the first antenna 11 and the second antenna 12, thus avoiding affecting the coupling mode between the first coupling portion 21 and the first antenna 11 and the second antenna 12. This ensures that the coupling element 2 can effectively suppress efficiency dips in the frequency band and generate new resonant modes, thereby expanding the bandwidth.

[0077] A mobile device according to a second aspect embodiment of the present invention includes an antenna structure 100 according to the first aspect embodiment described above.

[0078] Other configurations and operations of the mobile devices according to embodiments of the present invention are known to those skilled in the art and will not be described in detail here.

[0079] According to the embodiments of the present invention, by setting the antenna structure 100 of the first aspect embodiment, the mobile device can reduce the gaps 101 and improve the appearance while covering ultra-wide bandwidth and multiple frequency bands, realizing MIMO wireless communication technology, while ensuring antenna performance. At the same time, it can also reuse the structure, combine the SAR sensor design with the antenna structure, further optimize the internal space of the mobile phone, and thus improve the overall performance of the mobile device.

[0080] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0081] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0082] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0083] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," 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 the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0084] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. An antenna structure, characterized in that, include: A metal frame with a gap formed thereon, and a first antenna and a second antenna respectively formed on opposite sides of the gap. A coupling element is disposed on the inner side of the metal frame and opposite to the inside and outside of the gap. The coupling element is used to couple with the first antenna and the second antenna when they are working. The coupling element includes a first coupling part, a second coupling part and a third coupling part. The first coupling part extends along the width direction of the metal frame, and the projection of the first coupling part on the metal frame corresponds to the gap in the width direction of the metal frame. The second coupling part and the third coupling part are respectively connected to the two ends of the first coupling part in the width direction of the metal frame and extend along a plane that is generally perpendicular to the width direction of the metal frame. When the first antenna is in operation, it covers the B1 / 3 / 4 / 7 bands of LTE and the Wifi-2.4G band. When the second antenna is in operation, it covers the N77 / 79 bands of NR and the Wifi-5G band. The second antenna is coupled with the coupler to generate a new resonant mode above 6GHz to cover the Wifi-6e band.

2. The antenna structure according to claim 1, characterized in that, The distance between the first coupling part and the metal frame is less than or equal to 3mm.

3. The antenna structure according to claim 1, characterized in that, In the width direction of the gap, the length of the first coupling portion is greater than or equal to twice the width of the gap.

4. The antenna structure according to claim 3, characterized in that, In the width direction of the gap, the first coupling portion is located between the feed point of the first antenna and the feed point of the second antenna.

5. The antenna structure according to claim 1, characterized in that, The width of the gap is in the range of 1mm-2.5mm.

6. The antenna structure according to claim 1, characterized in that, The third coupling part is connected to the circuit board back to ground via a spring clip.

7. The antenna structure according to claim 6, characterized in that, A capacitor is connected in series between the spring and the circuit board.

8. The antenna structure according to any one of claims 1-7, characterized in that, Also includes: The bracket is located inside the metal frame, and the coupling element is located on the bracket. The first coupling part is located on the side wall of the bracket, the second coupling part is located on the upper surface of the bracket, and the third coupling part is located on the lower surface of the bracket.

9. The antenna structure according to claim 8, characterized in that, The coupling element is formed onto the bracket using laser direct forming technology.

10. The antenna structure according to claim 8, characterized in that, The third coupling part returns to ground via a connecting circuit board, and a connecting part extending toward the third coupling part is formed on the second coupling part, the connecting part passing through the bracket and connected to the third coupling part.

11. The antenna structure according to any one of claims 1-7, characterized in that, Both the first antenna and the second antenna are inverted-F antennas.

12. A mobile device, characterized in that, Includes the antenna structure according to any one of claims 1-11.

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