Antenna module and terminal equipment

Abstract

The invention provides an antenna module and terminal equipment, and the antenna module comprises a metal frame, the metal frame comprises a first radiation arm, the first end of the first radiation arm is provided with a first feeding point, the first feeding point is connected with a first signal, and the middle part of the first radiation arm is grounded; the FPC comprises a second radiation arm, and the second radiation arm and the first radiation arm are arranged adjacently; wherein the first radiation arm is coupled with the second radiation arm, and the first radiation arm excites radiation current in a quarter-wavelength mode on the second radiation arm. According to the antenna module and the terminal equipment disclosed by the invention, through the cooperation of the first radiation arm in the metal frame and the second radiation arm in the FPC, the radiation intensity and the radiation area of the first signal are greatly increased, so that the radiation efficiency of the antenna module is effectively improved, the bandwidth of the antenna module is expanded, the performance of the antenna module is further improved, and the user experience is improved. And the requirements of high efficiency and broadband are met.

Description

Technical Field

[0001] The present disclosure relates to the field of antenna technology, and in particular to an antenna module and a terminal device. Background Art

[0002] With the rapid development of communication technology, the number of antennas in terminal devices is increasing. However, terminal devices are gradually developing towards miniaturization and narrow bezels, which greatly reduces the layout space of antennas. There are strong coupling problems between antennas, resulting in low radiation efficiency and narrow bandwidth of some antennas, which greatly limits their performance. Summary of the invention

[0003] The present disclosure aims to solve one of the technical problems in the related art at least to some extent.

[0004] To this end, an object of the present disclosure is to provide an antenna module and a terminal device.

[0005] To achieve the above-mentioned purpose, the first aspect of the present disclosure provides an antenna module, comprising: a metal frame, the metal frame comprising: a first radiating arm, a first feeding point is arranged at the first end of the first radiating arm, the first feeding point is connected to a first signal, and the middle part of the first radiating arm is grounded; a flexible circuit board FPC, the FPC comprising: a second radiating arm, the second radiating arm and the first radiating arm are arranged adjacent to each other; wherein the first radiating arm and the second radiating arm are coupled, and the first radiating arm excites a radiation current in a quarter-wavelength mode on the second radiating arm.

[0006] Optionally, the first end of the second radiation arm is adjacent to the first end of the first radiation arm, the second end of the second radiation arm extends in a direction away from the first radiation arm, and the second end of the second radiation arm and the first radiation arm do not overlap in a thickness direction of the first end of the first radiation arm.

[0007] Optionally, at least a portion of the second radiation arm is an arc-shaped structure.

[0008] Optionally, the arc-shaped structure bends in a direction approaching the metal frame.

[0009] Optionally, the second radiation arm includes: a first part, a first end of the first part is arranged along the thickness direction of the first end of the first radiation arm and close to the first end of the first radiation arm, and the second end of the first part is folded and extends in a direction away from the first radiation arm; a second part, a first end of the second part is connected to the second end of the first part, and the second end of the second part extends in a direction away from the first radiation arm and presents the arc structure; a third part, a first end of the third part is connected to the second end of the second part, and the second end of the third part extends in a direction away from the first radiation arm; wherein the second end of the second part and the third part do not overlap with the first radiation arm in the thickness direction of the first end of the first radiation arm, and the sum of the length of the first part, the length of the second part and the length of the third part is equal to one quarter of the wavelength of the first signal.

[0010] Optionally, the FPC further includes: a spring sheet, the spring sheet and the first end of the first radiation arm are arranged adjacent to each other, and the spring sheet and the first end of the second radiation arm are abutted against each other.

[0011] Optionally, the antenna module also includes: a metal middle frame, the edge of the metal middle frame forms the metal frame; a mainboard, the mainboard is arranged on one side of the metal middle frame, and the spring is arranged on a non-metallic area of ​​the mainboard; a bracket, the bracket is arranged on a side of the mainboard away from the metal middle frame, and the FPC is arranged on a side of the bracket away from the mainboard.

[0012] Optionally, the first signal is a high-frequency signal.

[0013] Optionally, the metal frame also includes: a third radiating arm, a gap is arranged between the first end of the third radiating arm and the first end of the first radiating arm, a second feeding point is arranged in the middle of the third radiating arm, the second feeding point is connected to the second signal, and the first end of the third radiating arm is grounded.

[0014] Optionally, the second end of the second radiation arm and the first end of the third radiation arm overlap in a direction perpendicular to the length direction of the third radiation arm, and the common mode impedance and the differential mode impedance between the second radiation arm and the third radiation arm are equal.

[0015] Optionally, the length direction of the second end of the second radiation arm is arranged in parallel with the length direction of the third radiation arm, and the width of the second end of the second radiation arm is equal to the width of the third radiation arm.

[0016] Optionally, the metal frame includes: a top, a bottom, a first side and a second side located between the top and the bottom and opposite to each other, the first radiating arm is arranged at an end of the top close to the first side, and the third radiating arm is arranged at an end of the first side close to the top.

[0017] Optionally, the second signal is a medium or high frequency signal.

[0018] A second aspect of the present disclosure provides a terminal device, including: an antenna module as provided in the first aspect of the present disclosure.

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

[0020] Through the cooperation of the first radiation arm in the metal frame and the second radiation arm in the FPC, the radiation intensity and radiation area of ​​the first signal are greatly increased, thereby effectively improving the radiation efficiency of the antenna module, expanding the bandwidth of the antenna module, and further improving the performance of the antenna module, meeting the requirements of high efficiency and broadband.

[0021] Additional aspects and advantages of the present disclosure will be given in part in the following description and in part will be obvious from the following description or learned through practice of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The above and / or additional aspects and advantages of the present disclosure will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0023] Figure 1 is a schematic front view of an antenna module proposed in a related embodiment;

[0024] Figure 2 is a front view schematic diagram of an antenna module provided in one embodiment of the present disclosure;

[0025] Figure 3 is a front view schematic diagram of an antenna module provided in one embodiment of the present disclosure;

[0026] Figure 4 is a schematic top view of an antenna module provided in one embodiment of the present disclosure;

[0027] Figure 5 is a three-dimensional schematic diagram of an antenna module provided in an embodiment of the present disclosure;

[0028] Figure 6 is a schematic structural diagram of a metal frame in an antenna module proposed in an embodiment of the present disclosure;

[0029] Figure 7 is an efficiency comparison diagram proposed in an embodiment of the present disclosure;

[0030] As shown in the figure: A1, metal frame;

[0031] A11, a first radiation arm, A111, a first feeding point;

[0032] A12, second radiation arm, A121, second feeding point;

[0033] 1. Metal frame;

[0034] 11. a first radiating arm, 111. a first feeding point;

[0035] 12. a third radiation arm, 121. a second feeding point;

[0036] 13. break, 14. top, 15. bottom, 16. first side, 17. second side;

[0037] 2. FPC;

[0038] 21. second radiation arm, 211. first part, 212. second part, 213. third part;

[0039] 22. Shrapnel;

[0040] 3. Metal middle frame, 4. Motherboard, 5. Bracket. DETAILED DESCRIPTION

[0041] Embodiments of the present disclosure are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present disclosure, and are not to be construed as limitations of the present disclosure. On the contrary, the embodiments of the present disclosure include all changes, modifications, and equivalents that fall within the spirit and connotation of the appended claims.

[0042] like Figure 1 As shown, the relevant embodiment proposes an antenna module, including a metal frame A1, the metal frame A1 includes a first radiating arm A11 and a second radiating arm A12, a first feeding point A111 is arranged at the first end of the first radiating arm A11, the first feeding point A111 is connected to a first signal, the middle part of the first radiating arm A11 is grounded, a gap is arranged between the first end of the second radiating arm A12 and the first end of the first radiating arm A11, a second feeding point A121 is arranged in the middle part of the second radiating arm A12, the second feeding point A121 is connected to a second signal, and the first end of the second radiating arm A12 is grounded.

[0043] It can be understood that the first signal is fed from the first feeding point A111 into the first radiating arm A11 to stimulate a radiation current in the first radiating arm A11, thereby realizing the radiation of the first signal and meeting the first signal communication requirement of the antenna module; the second signal is fed from the second feeding point A121 into the second radiating arm A12 to stimulate a radiation current in the second radiating arm A12, thereby realizing the radiation of the second signal and meeting the second signal communication requirement of the antenna module.

[0044] Among them, as the terminal equipment is gradually developing towards miniaturization and narrow frame, the space inside the terminal equipment is relatively crowded, resulting in a poor clearance environment of the first radiation arm A11. At the same time, as the first radiation arm A11 and the second radiation arm A12 are arranged adjacent to each other, the second radiation arm A12 will have a strong coupling effect on the first radiation arm A11. As a result, the radiation efficiency of the first radiation arm A11 is low, the bandwidth is narrow, and the performance is greatly limited.

[0045] To solve the above technical problems, Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, an embodiment of the present disclosure proposes an antenna module, including a metal frame 1 and an FPC (Flexible Printed Circuit) 2, the metal frame 1 includes a first radiating arm 11, a first feeding point 111 is provided at the first end of the first radiating arm 11, the first feeding point 111 is connected to a first signal, the middle of the first radiating arm 11 is grounded, the FPC2 includes a second radiating arm 21, the second radiating arm 21 and the first radiating arm 11 are adjacently arranged, wherein the first radiating arm 11 and the second radiating arm 21 are coupled, and the first radiating arm 11 excites a radiation current in a quarter-wavelength mode on the second radiating arm 21.

[0046] It can be understood that the first signal is fed from the first feeding point 111 to the first radiating arm 11 to excite a radiation current in the first radiating arm 11, thereby realizing the radiation of the first signal on the first radiating arm 11. At the same time, since the first radiating arm 11 and the second radiating arm 21 are coupled, and the first radiating arm 11 excites a radiation current in a quarter-wavelength mode on the second radiating arm 21, the radiation of the first signal on the second radiating arm 21 is realized. Therefore, through the cooperation of the first radiating arm 11 in the metal frame 1 and the second radiating arm 21 in the FPC2, the radiation intensity and radiation area of ​​the first signal are greatly increased, thereby effectively improving the radiation efficiency of the antenna module, expanding the bandwidth of the antenna module, and then improving the performance of the antenna module, meeting the requirements of high efficiency and broadband.

[0047] Moreover, since the second radiation arm 21 in the FPC2 and the first radiation arm 11 in the metal frame 1 are arranged adjacent to each other, the second radiation arm 21 does not occupy the layout space of the metal frame 1. Therefore, when the antenna module is applied to the terminal device, it can provide higher communication quality and performance without increasing the size and complexity of the terminal device.

[0048] It should be noted that the metal frame 1 is a frame structure made of metal material. Since the metal frame 1 includes the first radiating arm 11, the first radiating arm 11 is also made of metal material, so that when the first feeding point 111 of the first radiating arm 11 is fed with the first signal, the radiation of the first signal can be achieved. The specific type of the first radiating arm 11 can be set according to actual needs and is not limited to this. For example, the first radiating arm 11 constitutes an IFA (Inverted-F Antenna), and the first radiating arm 11 is an "L"-shaped structure.

[0049] FPC2 is a flexible circuit board structure with high reliability formed by printing a metal pattern on a substrate of polyimide or polyester film material. The second radiation arm 21 is a metal pattern in FPC2. The specific type of the second radiation arm 21 can be set according to actual needs and is not limited to this.

[0050] The distance between the first radiation arm 11 and the second radiation arm 21 can be set according to actual needs, and there is no limitation on this. The distance between the first radiation arm 11 and the second radiation arm 21 should be able to ensure efficient coupling between the first radiation arm 11 and the second radiation arm 21 .

[0051] The quarter-wavelength mode may also be referred to as an eigenmode.

[0052] like Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, in some embodiments, the first end of the second radiation arm 21 and the first end of the first radiation arm 11 are arranged adjacent to each other, the second end of the second radiation arm 21 extends in a direction away from the first radiation arm 11, and the second end of the second radiation arm 21 and the first radiation arm 11 do not overlap in the thickness direction of the first end of the first radiation arm 11.

[0053] It can be understood that since the first end of the second radiation arm 21 and the first end of the first radiation arm 11 are arranged adjacent to each other, the first end of the second radiation arm 21 and the first end of the first radiation arm 11 can be coupled, so that the first radiation arm 11 can utilize the coupling between the first end of the second radiation arm 21 and the first end of the first radiation arm 11 to excite a quarter-wavelength mode of radiation current on the second radiation arm 21, thereby achieving an improvement in the radiation efficiency of the antenna module and an expansion of the bandwidth.

[0054] At the same time, since the second end of the second radiation arm 21 extends in a direction away from the first radiation arm 11, and the second end of the second radiation arm 21 and the first radiation arm 11 do not overlap in the thickness direction of the first end of the first radiation arm 11, a larger portion of the second radiation arm 21 can be away from the clearance of the first radiation arm 11, thereby reducing the interference of the second radiation arm 21 on the first radiation arm 11, thereby ensuring the effective improvement of the radiation efficiency of the antenna module and the effective expansion of the bandwidth.

[0055] It should be noted that the extension direction of the second end of the second radiation arm 21 can be set according to actual needs and is not limited to this. For example, the second end of the second radiation arm 21 can extend along the length direction of the first end of the first radiation arm 11, wherein the extension direction of a portion of the second radiation arm 21 and the length direction of the first end of the first radiation arm 11 can form a preset angle.

[0056] The thickness direction of the first end of the first radiation arm 11, the length direction of the first end of the first radiation arm 11 and the width direction of the first end of the first radiation arm 11 are perpendicular to each other, wherein, when the first radiation arm 11 is an "L"-shaped structure, the thickness direction of the first end of the first radiation arm 11 is perpendicular to the thickness direction of the second end of the first radiation arm 11, the length direction of the first end of the first radiation arm 11 is perpendicular to the length direction of the second end of the first radiation arm 11, and the width direction of the first end of the first radiation arm 11 is parallel to the width direction of the second end of the first radiation arm 11.

[0057] like Figure 2 , Figure 3 and Figure 5 As shown, in some embodiments, at least a portion of the second radiating arm 21 is an arc-shaped structure.

[0058] It can be understood that due to the setting of the arc structure, the second radiation arm 21 has a smaller space occupancy under the same current path, thereby effectively reducing the volume of the antenna module while improving the radiation efficiency of the antenna module and expanding the bandwidth of the antenna module. Therefore, when the antenna module is applied to the terminal device, it can meet the miniaturization design requirements of the terminal device.

[0059] It should be noted that the second radiation arm 21 may be entirely or partially an arc-shaped structure, and there is no limitation on this.

[0060] The type of the arc structure can be set according to actual needs, and there is no limitation on this. For example, the arc structure can be bent in a direction away from the metal frame 1 or in a direction close to the metal frame 1 .

[0061] like Figure 2 , Figure 3 and Figure 5As shown, in some embodiments, the arc-shaped structure is bent in a direction close to the metal frame 1 .

[0062] It can be understood that since the arc structure bends in the direction close to the metal frame 1, the second radiation arm 21 is closer to the metal frame 1, thereby reducing the occupation of the side space of the metal frame 1, and then when the antenna module is applied to the terminal device, it can better meet the miniaturization design requirements of the terminal device.

[0063] It should be noted that the curvature of the arc structure can be set according to actual needs and there is no limitation on this.

[0064] like Figure 5 As shown, in some embodiments, the second radiation arm 21 includes a first portion 211, a second portion 212 and a third portion 213, the first end of the first portion 211 is arranged along the thickness direction of the first end of the first radiation arm 11 and is close to the first end of the first radiation arm 11, the second end of the first portion 211 is folded and extends in a direction away from the first radiation arm 11, the first end of the second portion 212 is connected to the second end of the first portion 211, the second end of the second portion 212 extends in a direction away from the first radiation arm 11 and presents an arc-shaped structure, the first end of the third portion 213 is connected to the second end of the second portion 212, the second end of the third portion 213 extends in a direction away from the first radiation arm 11, wherein the second end of the second portion 212 and the third portion 213 do not overlap with the first radiation arm 11 in the thickness direction of the first end of the first radiation arm 11, respectively, and the sum of the length of the first portion 211, the length of the second portion 212 and the length of the third portion 213 is equal to one quarter of the wavelength of the first signal.

[0065] It can be understood that since the first end of the first part 211 is close to the first end of the first radiation arm 11, and the first end of the second part 212 is connected to the second end of the first part 211, and the first end of the third part 213 is connected to the second end of the second part 212, the sum of the length of the first part 211, the length of the second part 212 and the length of the third part 213 is equal to one quarter of the wavelength of the first signal, so that the first end of the first part 211 and the first end of the first radiation arm 11 can be coupled, and the first radiation arm 11 can utilize the coupling between the first end of the first part 211 and the first end of the first radiation arm 11 to excite a quarter-wavelength mode of radiation current on the first part 211, the second part 212 and the third part 213, thereby achieving the improvement of the radiation efficiency of the antenna module and the expansion of the bandwidth.

[0066] Since the first end of the first part 211 is arranged along the thickness direction of the first end of the first radiation arm 11, and the second end of the first part 211 is folded and extends in a direction away from the first radiation arm 11, the first part 211 forms a U-shaped structure, which can not only increase the coupling area between the first radiation arm 11 and the second radiation arm 21, thereby improving the coupling efficiency, but also reduce the space occupied by the second radiation arm 21, and thus when the antenna module is applied to the terminal device, it can meet the miniaturization design requirements of the terminal device.

[0067] Since the second end of the second part 212 extends in a direction away from the first radiation arm 11 and has an arc-shaped structure, and the second end of the third part 213 extends in a direction away from the first radiation arm 11, the second end of the second part 212 and the third part 213 can be away from the clearance of the first radiation arm 11, thereby reducing the interference of the second radiation arm 21 on the first radiation arm 11, thereby ensuring the effective improvement of the radiation efficiency of the antenna module and the effective expansion of the bandwidth.

[0068] It should be noted that the specific types of the first part 211, the second part 212 and the third part 213 can be set according to actual needs and are not limited to this. For example, a through hole is set at the bending position of the first part 211 to utilize the through hole to reduce the bending stress of the first part 211. The third part 213 is a regular structure close to a rectangle. The third part 213 is set along the length direction of the first end of the first radiation arm 11. The third part 213 has a large length and width. As the main structure of the second radiation arm 21, it has a distribution of more radiation current.

[0069] like Figure 5 As shown, in some embodiments, the FPC 2 further includes a spring sheet 22 , the spring sheet 22 and the first end of the first radiation arm 11 are disposed adjacent to each other, and the spring sheet 22 and the first end of the second radiation arm 21 abut against each other.

[0070] It can be understood that since the spring clip 22 and the first end of the first radiation arm 11 are arranged adjacent to each other, the spring clip 22 and the first end of the first radiation arm 11 can be coupled, and since the spring clip 22 and the first end of the second radiation arm 21 are abutted, the first radiation arm 11 can utilize the coupling between the spring clip 22 and the first end of the first radiation arm 11 to excite a quarter-wavelength mode of radiation current on the second radiation arm 21, thereby achieving an improvement in the radiation efficiency of the antenna module and an expansion of the bandwidth.

[0071] Among them, due to the setting of the spring piece 22, not only the coupling between the first end of the second radiation arm 21 and the first end of the first radiation arm 11 is facilitated, but also the first end of the second radiation arm 21 and the first end of the first radiation arm 11 have a higher coupling efficiency, thereby ensuring the stable improvement of the radiation efficiency of the antenna module and the stable expansion of the bandwidth.

[0072] It should be noted that the spring sheet 22 is an elastic metal sheet, and the specific type of the spring sheet 22 can be set according to actual needs, and there is no limitation on this. The spring sheet 22 can abut against the first end of the first portion 211 of the second radiating arm 21 .

[0073] like Figure 2 , Figure 3 and Figure 5 As shown, in some embodiments, the antenna module also includes a metal middle frame 3, a main board 4 and a bracket 5, the edge of the metal middle frame 3 forms a metal frame 1, the main board 4 is arranged on one side of the metal middle frame 3, the spring clip 22 is arranged on a non-metallic area of ​​the main board 4, the bracket 5 is arranged on a side of the main board 4 away from the metal middle frame 3, and the FPC2 is arranged on a side of the bracket 5 away from the main board 4.

[0074] It can be understood that, through the setting of the mainboard 4, the stable bearing of the spring 22 is achieved, and through the setting of the bracket 5, the stable bearing of the FPC2 is achieved. Through the setting of the metal middle frame 3, not only the metal frame 1 is formed, but also the stable bearing of the mainboard 4 and the bracket 5 is achieved. Thus, the stable coupling between the spring 22 and the first radiation arm 11 and the stable electrical connection between the spring 22 and the second radiation arm 21 are guaranteed, thereby ensuring the stable improvement of the radiation efficiency of the antenna module and the stable expansion of the bandwidth.

[0075] It should be noted that the metal middle frame 3 is a frame structure made of metal material, and the specific type of the metal middle frame 3 can be set according to actual needs, and there is no limitation on this. For example, the metal middle frame 3 can be a middle frame in a terminal device. The grounding of the antenna module can be achieved by metal screws on the metal middle frame 3.

[0076] The specific type of the mainboard 4 can be set according to actual needs, and there is no limitation on this. For example, the mainboard 4 can be a main circuit board in the terminal device.

[0077] The specific type of the bracket 5 can be set according to actual needs, and there is no limitation on this. For example, the bracket 5 can be a plastic bracket 5 in the terminal device.

[0078] In some embodiments, the first signal is a high band (HB) signal.

[0079] It can be understood that the high-frequency signal is fed from the first feeding point 111 to the first radiating arm 11 to excite a radiation current in the first radiating arm 11, thereby realizing the radiation of the high-frequency signal on the first radiating arm 11. At the same time, since the first radiating arm 11 and the second radiating arm 21 are coupled, and the first radiating arm 11 excites a radiation current in a quarter-wavelength mode on the second radiating arm 21, the radiation of the high-frequency signal on the second radiating arm 21 is realized. Therefore, through the cooperation of the first radiating arm 11 in the metal frame 1 and the second radiating arm 21 in the FPC2, the radiation intensity and radiation area of ​​the high-frequency signal are greatly increased, thereby effectively improving the radiation efficiency of the antenna module, expanding the bandwidth of the antenna module, and then improving the performance of the antenna module, meeting the requirements of high efficiency and broadband.

[0080] It should be noted that the specific type of the high-frequency signal is set according to actual needs and is not limited to this. For example, the high-frequency signal can be a 5G (5th Generation Mobile Communication Technology) N78 frequency band signal.

[0081] like Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, in some embodiments, the metal frame 1 also includes a third radiating arm 12, a gap 13 is arranged between the first end of the third radiating arm 12 and the first end of the first radiating arm 11, a second feeding point 121 is arranged in the middle of the third radiating arm 12, the second feeding point 121 is connected to the second signal, and the first end of the third radiating arm 12 is grounded.

[0082] It can be understood that the second signal is fed from the second feeding point 121 into the third radiating arm 12 to stimulate a radiation current in the third radiating arm 12, thereby achieving radiation of the second signal on the third radiating arm 12, and then cooperating with the first radiating arm 11 and the second radiating arm 21 to meet the multi-frequency communication requirements of the antenna module.

[0083] Among them, through the setting of the second radiation arm 21, the radiation efficiency of the antenna module is effectively improved, and the bandwidth of the antenna module is expanded, thereby reducing the coupling effect of the third radiation arm 12 on the first radiation arm 11, ensuring the stable realization of multi-frequency communication of the antenna module.

[0084] like Figure 2 , Figure 3 , Figure 4 and Figure 5As shown, in some embodiments, the second end of the second radiation arm 21 and the first end of the third radiation arm 12 overlap in a direction perpendicular to the length direction of the third radiation arm 12, and the common mode impedance and differential mode impedance between the second radiation arm 21 and the third radiation arm 12 are equal.

[0085] It can be understood that since the second end of the second radiating arm 21 and the first end of the third radiating arm 12 overlap in a direction perpendicular to the length direction of the third radiating arm 12, the second end of the second radiating arm 21 is located in the clearance of the third radiating arm 12. However, since the common-mode impedance and the differential-mode impedance between the second radiating arm 21 and the third radiating arm 12 are equal, mode cancellation is achieved between the second radiating arm 21 and the third radiating arm 12, thereby avoiding the coupling problem between the second radiating arm 21 and the third radiating arm 12, thereby improving the radiation efficiency of the antenna module and expanding the bandwidth while also ensuring the strong multi-frequency coverage capability of the antenna module.

[0086] It should be noted that the port equivalent current I of the second radiation arm 21 is FPC for:

[0087]

[0088] The port equivalent current I of the third radiation arm 12 MHB for:

[0089]

[0090] Among them, I CM is the input current of the second radiation arm 21 and the third radiation arm 12 in the common mode state, I DM is the input current of the second radiation arm 21 and the third radiation arm 12 in the differential mode state, S cc11 is the reflection coefficient of the second radiation arm 21 and the third radiation arm 12 in the common mode state, S dd11 is the reflection coefficient of the second radiation arm 21 and the third radiation arm 12 in the differential mode state.

[0091] When the common-mode impedance and the differential-mode impedance between the second radiation arm 21 and the third radiation arm 12 are equal, the common-mode and differential-mode S parameters between the second radiation arm 21 and the third radiation arm 12 are equal. It can be seen from the above formula that when the common-mode and differential-mode S parameters between the second radiation arm 21 and the third radiation arm 12 are equal, complete decoupling of the second radiation arm 21 and the third radiation arm 12 can be achieved. If the common-mode and differential-mode S parameters between the second radiation arm 21 and the third radiation arm 12 are not equal, an incomplete structure between the second radiation arm 21 and the third radiation arm 12 will be caused, resulting in coupling between the second radiation arm 21 and the third radiation arm 12.

[0092] The direction perpendicular to the length direction of the third radiation arm 12 may be the thickness direction of the third radiation arm 12 , or the width direction of the third radiation arm 12 , or other directions within the plane where the thickness direction and the width direction of the third radiation arm 12 are located.

[0093] like Figure 3 and Figure 4 As shown, in some embodiments, the length direction of the second end of the second radiation arm 21 is parallel to the length direction of the third radiation arm 12 , and the width of the second end of the second radiation arm 21 is equal to the width of the third radiation arm 12 .

[0094] It can be understood that since the length direction of the second end of the second radiation arm 21 is arranged in parallel with the length direction of the third radiation arm 12, and the width of the second end of the second radiation arm 21 is equal to the width of the third radiation arm 12, the common-mode impedance and differential-mode impedance between the second radiation arm 21 and the third radiation arm 12 can be equal, thereby achieving mode cancellation between the second radiation arm 21 and the third radiation arm 12, and thus avoiding the coupling problem between the second radiation arm 21 and the third radiation arm 12.

[0095] It should be noted that the impedance Z of the antenna is:

[0096]

[0097] Among them, ε r is the relative dielectric constant of the antenna, w is the width of the antenna radiation arm, and h is the clearance height of the antenna.

[0098] It can be seen from the above formula that the relative dielectric constant of the antenna, the width of the radiation arm and the clearance height are the key parameters that determine the antenna impedance. However, in the present embodiment, since the relative dielectric constant of each radiation arm in the antenna module is a fixed value and the clearance height is determined and difficult to change, the width w1 of the second end of the second radiation arm 21 can be made equal to the width w2 of the third radiation arm 12, thereby achieving equal common-mode impedance and differential-mode impedance between the second radiation arm 21 and the third radiation arm 12.

[0099] The width of the second end of the second radiation arm 21 being equal to the width of the third radiation arm 12 can be understood as the width of the second end of the second radiation arm 21 being completely equal to the width of the third radiation arm 12 , or the width of the second end of the second radiation arm 21 being approximately equal to the width of the third radiation arm 12 .

[0100] The width of the second end of the second radiation arm 21 may be the width of the third portion 213 in the second radiation arm 21 .

[0101] like Figure 6As shown, in some embodiments, the metal frame 1 includes a top 14, a bottom 15, a first side 16 and a second side 17 located between the top 14 and the bottom 15 and opposite to each other, the first radiating arm 11 is arranged at one end of the top 14 close to the first side 16, and the third radiating arm 12 is arranged at one end of the first side 16 close to the top 14.

[0102] It can be understood that by arranging the first radiation arm 11 and the third radiation arm 12 adjacent to each other at the corner where the first side 16 and the top 14 are connected in the metal frame 1, the antenna module can be kept away from the handheld position when used in the terminal device, thereby ensuring that the antenna module has higher radiation efficiency and wider bandwidth.

[0103] It should be noted that, based on the simulation of the antenna module of the related embodiment and the antenna module of this embodiment, the following is obtained: Figure 7 The efficiency comparison chart shown is Figure 7 The horizontal axis is the frequency, the vertical axis is the radiation efficiency, the first curve represents the antenna module of the related embodiment, and the second curve represents the antenna module of this embodiment. Figure 7 It can be seen that the radiation efficiency of the antenna module of this embodiment is significantly improved compared with the antenna module of the related embodiments, and correspondingly, the bandwidth is also expanded.

[0104] In some embodiments, the second signal is a middle high band (MHB) signal.

[0105] It can be understood that the medium and high frequency signals are fed from the second feeding point 121 into the third radiating arm 12 to stimulate a radiation current in the third radiating arm 12, thereby realizing the radiation of the medium and high frequency signals on the third radiating arm 12, and then cooperating with the first radiating arm 11 and the second radiating arm 21 to meet the multi-frequency communication requirements of the antenna module.

[0106] The embodiment of the present disclosure also provides a terminal device, including the antenna module of the embodiment of the present disclosure.

[0107] It can be understood that the first signal is fed from the first feeding point 111 to the first radiating arm 11 to excite a radiation current in the first radiating arm 11, thereby realizing the radiation of the first signal on the first radiating arm 11. At the same time, since the first radiating arm 11 and the second radiating arm 21 are coupled, and the first radiating arm 11 excites a radiation current in a quarter-wavelength mode on the second radiating arm 21, the radiation of the first signal on the second radiating arm 21 is realized. Therefore, through the cooperation of the first radiating arm 11 in the metal frame 1 and the second radiating arm 21 in the FPC2, the radiation intensity and radiation area of ​​the first signal are greatly increased, thereby effectively improving the radiation efficiency of the antenna module, expanding the bandwidth of the antenna module, and then improving the performance of the antenna module, meeting the requirements of high efficiency and broadband.

[0108] Moreover, since the second radiation arm 21 in the FPC2 and the first radiation arm 11 in the metal frame 1 are arranged adjacent to each other, the second radiation arm 21 does not occupy the layout space of the metal frame 1, thereby providing higher communication quality and performance without increasing the size and complexity of the terminal device.

[0109] It should be noted that the specific type of the terminal device can be set according to actual needs and is not limited to this. For example, the terminal device can be a mobile phone, a tablet computer, a wearable smart device, etc.

[0110] In the description of the present disclosure, the terms "first", "second", etc. are used for descriptive purposes only and cannot be understood as indicating or implying relative importance. In addition, in the description of the present disclosure, unless otherwise specified, "plurality" means two or more.

[0111] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, segment or portion of code that includes one or more executable instructions for implementing the steps of a specific logical function or process, and the scope of the preferred embodiments of the present disclosure includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by those skilled in the art to which the embodiments of the present disclosure belong.

[0112] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present disclosure. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0113] Although the embodiments of the present disclosure have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present disclosure. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present disclosure.

Claims

1. An antenna module, characterized in that: include: A metal frame, the metal frame comprising: a first radiating arm, a first end of the first radiating arm is provided with a first feeding point, the first feeding point is connected to a first signal, and a middle portion of the first radiating arm is grounded; A flexible circuit board FPC, the FPC comprising: a second radiation arm, the second radiation arm and the first radiation arm are arranged adjacent to each other; The first radiation arm is coupled to the second radiation arm, and the first radiation arm excites a radiation current in a quarter-wavelength mode on the second radiation arm.

2. The antenna module according to claim 1, characterized in that: The first end of the second radiation arm is adjacent to the first end of the first radiation arm, the second end of the second radiation arm extends in a direction away from the first radiation arm, and the second end of the second radiation arm does not overlap with the first radiation arm in a thickness direction of the first end of the first radiation arm.

3. The antenna module according to claim 2, characterized in that: At least a portion of the second radiation arm is an arc-shaped structure.

4. The antenna module according to claim 3, characterized in that: The arc structure is bent in a direction close to the metal frame.

5. The antenna module according to claim 3, characterized in that: The second radiating arm comprises: A first part, wherein a first end of the first part is arranged along a thickness direction of the first end of the first radiation arm and is close to the first end of the first radiation arm, and a second end of the first part is folded and extends in a direction away from the first radiation arm; a second part, wherein the first end of the second part is connected to the second end of the first part, and the second end of the second part extends in a direction away from the first radiation arm and presents the arc-shaped structure; a third portion, wherein a first end of the third portion is connected to a second end of the second portion, and the second end of the third portion extends in a direction away from the first radiation arm; The second end of the second part and the third part do not overlap with the first radiation arm in the thickness direction of the first end of the first radiation arm, and the sum of the length of the first part, the length of the second part and the length of the third part is equal to one quarter of the first signal wavelength.

6. The antenna module according to claim 2, characterized in that: The FPC further comprises: The spring sheet is disposed adjacent to the first end of the first radiation arm, and the spring sheet is in contact with the first end of the second radiation arm.

7. The antenna module according to claim 6, characterized in that: The antenna module also includes: A metal middle frame, the edge of which forms the metal frame; A mainboard, wherein the mainboard is arranged on one side of the metal middle frame, and the spring is arranged on a non-metallic area of ​​the mainboard; The bracket is arranged on a side of the mainboard away from the metal middle frame, and the FPC is arranged on a side of the bracket away from the mainboard.

8. The antenna module according to claim 1, characterized in that: The first signal is a high-frequency signal.

9. The antenna module according to any one of claims 1 to 8, characterized in that: The metal frame also includes: A third radiation arm, a gap is arranged between the first end of the third radiation arm and the first end of the first radiation arm, a second feeding point is arranged in the middle of the third radiation arm, the second feeding point is connected to a second signal, and the first end of the third radiation arm is grounded.

10. The antenna module according to claim 9, characterized in that: The second end of the second radiation arm and the first end of the third radiation arm overlap in a direction perpendicular to the length direction of the third radiation arm, and the common mode impedance and the differential mode impedance between the second radiation arm and the third radiation arm are equal.

11. The antenna module according to claim 10, characterized in that: The length direction of the second end of the second radiation arm is parallel to the length direction of the third radiation arm, and the width of the second end of the second radiation arm is equal to the width of the third radiation arm.

12. The antenna module according to claim 9, characterized in that: The metal frame comprises: A top, a bottom, a first side and a second side located between the top and the bottom and opposite to each other, the first radiating arm is arranged at one end of the top close to the first side, and the third radiating arm is arranged at one end of the first side close to the top.

13. The antenna module according to claim 9, characterized in that: The second signal is a medium-high frequency signal.

14. A terminal device, characterized in that: include: The antenna module as claimed in any one of claims 1 to 13.

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