Antenna module and electronic device

Abstract

The application relates to an antenna module and an electronic device. The antenna module comprises a first antenna and a second antenna. The free end of a first radiating branch of the first antenna is open towards a direction away from the second antenna. The first radiating branch and a second radiating branch of the first antenna support the transmission of a first frequency band signal through gap coupling under the excitation of a first feed source. A third radiating branch of the second antenna supports the transmission of a second frequency band signal under the excitation of a second feed source. The first frequency band and the second frequency band are both in a same preset frequency range. Since the first radiating branch and the second radiating branch are coupled, and the opening of the first radiating branch at the coupling position is directed away from the third radiating branch, the coupling between the first radiating branch and the third radiating branch away from the gap coupling position can be reduced, the interference between the first antenna and the second antenna is reduced as a whole, the isolation between the antennas is improved, and the overall radiation performance is improved.

Description

Technical Field

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

[0002] As technology advances, electronic devices are taking on more and more functions, such as typical photography and gaming. This requires increasingly advanced cameras and larger battery capacities, which takes up space on the motherboard and antennas of electronic devices. For example, when there is insufficient space on the motherboard, Wi-Fi antennas are prone to interference with other antennas operating on the same frequency. Summary of the Invention

[0003] This application provides an antenna module and electronic device that can improve the isolation between antennas.

[0004] The first aspect of this application provides an antenna module, comprising:

[0005] The first antenna includes a first radiating stub, a second radiating stub, and a first feed source. The first radiating stub has a first free end and a feed end. A gap is formed between the first free end and the second radiating stub. The feed end is located on the side of the first free end away from the gap, and the feed end is connected to the first feed source.

[0006] The second antenna includes a third radiating stub and a second feed connected together. The third radiating stub is located on the side of the feed end away from the gap and is spaced apart from the first antenna.

[0007] The first feed source is used to output a first feed signal to excite the first radiating stub and the second radiating stub to perform slot coupling and jointly support the transmission of the first frequency band signal; the second feed source is used to output a second feed signal to excite the third radiating stub to support the transmission of the second frequency band signal; the first frequency band and the second frequency band are respectively within a preset frequency range.

[0008] A second aspect of this application provides an electronic device, comprising:

[0009] floor;

[0010] As described above, each grounding terminal of the antenna module is connected to the ground plane.

[0011] In the aforementioned antenna module and electronic device, the antenna module includes a first antenna and a second antenna. The first antenna includes a first radiating stub, a second radiating stub, and a first feed. The free end opening of the first radiating stub faces away from the second antenna. The second antenna includes a third radiating stub and a second feed. Under the excitation of the first feed, the first and second radiating stubs, through slot coupling, jointly support the transmission of signals in the first frequency band. Under the excitation of the second feed, the third radiating stub supports the transmission of signals in the second frequency band. Although the first and second frequency bands are both within the same preset frequency range, the coupling between the first and second radiating stubs, and the fact that the opening of the first radiating stub at the coupling position faces away from the third radiating stub, reduces the coupling between the first radiating stub and the third radiating stub away from the slot coupling position. This reduces interference between the first antenna and the second antenna as a whole and improves the isolation between the antennas. Furthermore, the slot coupling between the first and second radiating stubs also enhances the radiation performance of the first antenna. Therefore, when the first antenna and the second antenna operate in the first frequency band and the second frequency band respectively, the antenna module and electronic equipment can reduce the interference between the two antennas, improve the isolation between the antennas, and enhance the overall radiation performance without changing the distance between the first antenna and the second antenna. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 This is one of the structural block diagrams of an antenna module according to an embodiment of this application;

[0014] Figure 2 This is a structural block diagram of an antenna module according to an embodiment of the related technology;

[0015] Figure 3 This is a second structural block diagram of an antenna module according to an embodiment of this application;

[0016] Figure 4 This is the third structural block diagram of an antenna module according to an embodiment of this application;

[0017] Figure 5 This is the fourth structural block diagram of an antenna module according to an embodiment of this application;

[0018] Figure 6 This is the fifth structural block diagram of an antenna module according to an embodiment of this application;

[0019] Figure 7 This is the sixth structural block diagram of an antenna module according to an embodiment of this application;

[0020] Figure 8 This is the seventh structural block diagram of an antenna module according to an embodiment of this application;

[0021] Figure 9 This is the eighth structural block diagram of an antenna module according to an embodiment of this application;

[0022] Figure 10 This is the ninth structural block diagram of an antenna module according to an embodiment of this application;

[0023] Figure 11 This is a structural block diagram of the middle frame of an embodiment of this application;

[0024] Figure 12 This is a structural block diagram of an electronic device according to an embodiment of the related technology;

[0025] Figure 13 This is an S-parameter curve diagram of an embodiment of the related technology;

[0026] Figure 14 This is a structural block diagram of an electronic device according to an embodiment of this application;

[0027] Figure 15 This is one of the simulation diagrams of current distribution in an electronic device according to an embodiment of this application;

[0028] Figure 16 This is a second simulation diagram of the current distribution of an electronic device according to an embodiment of this application;

[0029] Figure 17 This is the third simulation diagram of the current distribution of an electronic device according to an embodiment of this application;

[0030] Figure 18 This is the fourth of four simulation diagrams showing the current distribution of an electronic device according to an embodiment of this application.

[0031] Figure 19 This is an S-parameter curve diagram of an embodiment of this application;

[0032] Figure 20 This is a system efficiency curve of an embodiment of this application. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0034] It is understood that the terms "first," "second," etc., used in this application may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another 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 at least one of that feature. In the description of this application, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified. When an element is considered to be "connected" to another element, it may be directly connected to the other element or there may be an intervening element present.

[0035] The antenna module described in this application can be applied to electronic devices with wireless communication capabilities. These electronic devices can be handheld devices, in-vehicle devices, smart cars, wearable devices, computing devices, or other processing devices connected to a wireless modem, as well as various forms of user equipment (UE) (e.g., mobile phones), mobile stations (MS), etc. For ease of description, the devices mentioned above are collectively referred to as electronic devices.

[0036] Figure 1 Here is a structural block diagram of an antenna module according to one embodiment, with reference to Figure 1 In this embodiment, the antenna module includes: a first antenna 10 and a second antenna 20.

[0037] The first antenna 10 includes a first radiating stub 110, a second radiating stub 120, and a first feed source S1. The first radiating stub 110 has a first free end (Z1 in the figure) and a feed end (K in the figure). A gap is formed between the first free end and the second radiating stub 120. The feed end is located on the side of the first free end away from the gap and is connected to the first feed source S1. The second antenna 20 ( Figure 1 The following is an illustration of one possible antenna configuration for the second antenna 20 (for illustrative purposes only and not intended to be limiting), including a third radiating stub 210 and a second feed source S2 connected together. The third radiating stub 210 is located on the side of the feed end away from the slot and is spaced apart from the first antenna 10. The first feed source S1 is used to output a first feed signal to excite the first radiating stub 110 and the second radiating stub 120 to perform slot coupling and jointly support the transmission of the first frequency band signal. The second feed source S2 is used to output a second feed signal to excite the third radiating stub 210 to support the transmission of the second frequency band signal. The first frequency band and the second frequency band are respectively within a preset frequency range.

[0038] The first radiating stub 110, the second radiating stub 120, and the first feed source S1 can be combined to form the first antenna 10. The first radiating stub 110 is connected to the first feed source S1 via a feed terminal to receive a first feed signal output from the first feed source S1. Under the excitation of the first feed signal, a current is generated on the surface to support signal transmission. The first feed source S1 can be a device such as an RF chip capable of providing a feed signal. The second radiating stub 120 is opposite to the first free end of the first radiating stub 110 and forms a gap. When the first radiating stub 110 resonates under the excitation of the first feed signal, the second radiating stub 120 can couple with the first radiating stub 110 through the gap to generate a current on the surface to support signal transmission. Under the excitation of the first feed signal, the first radiating stub 110 and the second radiating stub 120 jointly generate a resonance supporting the first frequency band, enabling the first antenna 10 to support the transmission of signals in the first frequency band.

[0039] The third radiating stub 210 and the second feed source S2 can be combined to form the second antenna 20. The third radiating stub 210 is connected to the second feed source S2 to receive the second feed signal output by the second feed source S2. Under the excitation of the second feed signal, a current is generated on the surface to support the transmission of the second frequency band signal. The second feed source S2 can be a device such as an RF chip that provides a feed signal.

[0040] The first radiating stub 110 can be understood as the main stub, and the second radiating stub 120 can be understood as the parasitic stub. The main stub, through its coupling with the parasitic stub via a slot, can enhance the radiation performance of the first antenna 10. Simultaneously, due to the coupling between the two stubs, and the fact that the slot opening of the first radiating stub 110 (which can also be understood as the free end opening) faces away from the third radiating stub 210, the coupling between the third radiating stub 210 (located on the side of the first radiating stub 110 away from the slot) and the first radiating stub 110 can be reduced when the first antenna 10 and the second antenna 20 are operating in the first and second frequency bands, respectively. This reduces overall interference between the first antenna 10 and the second antenna 20, improving the isolation between the antennas. Optionally, the size of the slot can be in the range of 1.5mm-2mm, or less than 1mm, for example, in the range of 0.1-0.5mm. It is understandable that before the coupling reaches the threshold, the smaller the gap between the main branch and the parasitic branch, the greater the coupling between the two radiating branches, which can make the isolation of the two antennas higher.

[0041] Wherein, the first frequency band and the second frequency band are respectively in the same preset frequency range, which can be understood as the first frequency band and the second frequency band corresponding to adjacent frequency ranges. Adjacent frequency ranges may include at least one of two frequency bands that are spaced apart within the preset frequency range or two frequency bands that at least partially overlap. Further, two frequency bands that are close to completely overlap or completely overlap can be understood as having the same frequency.

[0042] Optionally, the first frequency band and the second frequency band can be frequency bands of the same standard and within the same preset frequency range. For example, both the first frequency band and the second frequency band can be cellular frequency bands, such as 4G Long Term Evolution (LTE) signal bands or 5G New Radio (NR) signal bands. The first frequency band and the second frequency band can be any of the following frequency bands: low frequency (LB) band, medium high frequency (MHB) band, and ultra-high frequency (UHB) band.

[0043] Optionally, the first frequency band and the second frequency band can be frequency bands of different standards within the same preset frequency range. For example, the first frequency band can be a cellular frequency band, and the second frequency band can be a Wi-Fi frequency band. For example, the preset frequency range can be a frequency range of 300 kHz to 30 MHz, the first frequency band can be the MHB frequency band, and the second frequency band can be at least one of the Wi-Fi / BT 2.4G and Wi-Fi / BT 5G frequency bands. In other embodiments, the first frequency band and the second frequency band can also be other standard frequency bands, etc.

[0044] In related technologies, when two frequency bands are within the same preset frequency range as defined above, the antennas will interfere with each other, thereby reducing the antenna's radiation performance. Taking the first frequency band as the WIFI band and the second antenna 20 as the MHB band as an example, for a single WIFI antenna, when it is adjacent to the MHB antenna and operates at the same frequency, it is easy for it to interfere with the MHB antenna, leading to a decrease in the performance of either the WIFI antenna or the MHB antenna. For a dual-WIFI MIMO antenna system, when there is insufficient motherboard space, the WIFI antenna is more likely to interfere with the MHB antenna.

[0045] To increase the isolation between two antennas and improve antenna performance, the distance between the two antennas is usually increased. However, for a single Wi-Fi antenna system, while increasing the distance improves antenna isolation, it also increases the overall footprint of the antenna module. For a dual Wi-Fi antenna system, the two Wi-Fi antennas are typically located on either side of the MHB antenna. Increasing the distance between one Wi-Fi antenna and the MHB antenna will increase the distance between the other Wi-Fi antenna and the MHB antenna, and thus increase the mutual interference between the two antennas. Figure 2 Taking the dual-WIFI antenna system shown as an example, it is not possible to simultaneously improve the isolation between the MHB antenna and the two WIFI antennas by increasing the distance.

[0046] The antenna module provided in this embodiment includes a first antenna 10 and a second antenna 20. The first antenna 10 includes a first radiating stub 110, a second radiating stub 120 and a first feed S1. The free end opening of the first radiating stub 110 faces away from the second antenna 20. The second antenna 20 includes a third radiating stub 210 and a second feed S2. The first radiating stub 110 and the second radiating stub 120, under the excitation of the first feed S1, jointly support the transmission of the first frequency band signal through slot coupling. The third radiating stub 210, under the excitation of the second feed S2, supports the transmission of the second frequency band signal. Although the first and second frequency bands are both within the same preset frequency range, the coupling between the first radiating stub 110 and the second radiating stub 120, and the slot opening at the coupling position facing away from the third radiating stub 210, can reduce the coupling between the first radiating stub 110 and the third radiating stub 210 away from the slot coupling position. This reduces the overall interference between the first antenna 10 and the second antenna 20 and improves the isolation between the antennas. In addition, the slot coupling between the first radiating stub 110 and the second radiating stub 120 can also enhance the radiation performance of the first antenna 10. Therefore, when the first antenna 10 and the second antenna 20 operate in the first frequency band and the second frequency band respectively, the antenna module can reduce the interference between the two antennas and improve the isolation between the antennas without changing the distance between the first antenna 10 and the second antenna 20, while improving the overall radiation performance.

[0047] In one embodiment, a first feed signal is used to excite the first radiating stub 110 and the second radiating stub 120 to couple through a gap, thereby generating a first current distributed on the entire arm of the first radiating stub 110 and a second current distributed on the entire arm of the second radiating stub 120. The first current and the second current flow in the same direction, and the difference in current intensity between the first current and the second current is within a preset range.

[0048] The difference in current intensity between the first current and the second current is within a preset range to indicate that the intensities of the two currents are relatively close, and the current intensity generated at most locations of the first radiating stub 110 and the second radiating stub 120 is relatively uniform. Optionally, the preset range may include a range where the difference in current intensity is equal to or close to 0.

[0049] The first radiating stub 110 generates a first current on the entire arm under the excitation of the first feed signal. The first current excites the second radiating stub 120 to generate a second current on the entire arm through the gap. The two currents flow in the same direction. The gap is small. The two radiating stubs are equivalent to the entire arm radiating. The current generated at most locations of the first antenna 10 is evenly distributed, and there is relatively uniform radiation everywhere. There is no special enhancement of radiation in a certain direction. Therefore, when the first antenna 10 and the second antenna 20 operate at the same frequency, the interference of the first antenna 10 to the second antenna 20 can be reduced, and the isolation between the two antennas can be improved.

[0050] In one embodiment, the radiation mode corresponding to the gap coupling between the first radiating stub 110 and the second radiating stub 120 is the inductive coupling excitation mode of the entire arm.

[0051] In this radiation mode, the inductive coupling excitation mode can be understood as the ICE (Set of Inductive Couplers) mode, and the slot can be understood as the inductive coupling excitation structure in this radiation mode. In this radiation mode, the current at the slot is equivalent to a direct flow. The first radiating stub 110, the slot, and the second radiating stub 120 are equivalent to forming a complete radiating arm, generating a uniform current distribution. The first antenna 10 radiates uniformly, and the radiating positions are relatively evenly distributed throughout the first antenna 10. The isolation effect of the first antenna 10 relative to the adjacent second antenna 20 operating at the same frequency is equivalent to increasing the radiation distance between the two antennas and improving the isolation between the two antennas.

[0052] In one embodiment, such as Figure 3 As shown, the extension direction of the first radial branch 110 (F in the figure) is the same as the extension direction of the second radial branch 120, and the extension dimension of the first radial branch 110 is larger than that of the second radial branch 120. It can be understood that the extension direction can be from the second radial branch 120 to the first radial branch 110, or from the first radial branch 110 to the second radial branch 120. The extension direction is used to characterize the direction of the dimension, but it is not understood that the branch necessarily has a dynamic extension action.

[0053] The extension dimension of the first radiating stub 110 is relatively longer than that of the second radiating stub 120, which ensures that the first radiating stub 110 connected to the first feed S1 serves as the main stub, responsible for the main radiation function and providing better radiation efficiency. The extension dimension of the second radiating stub 120 is relatively shorter than that of the first radiating stub 110, which can avoid the generation of reverse current, thereby ensuring that the current generated by the gap coupling of the two radiating stubs of the first antenna 10 flows in the same direction and the radiation is more uniform.

[0054] In one embodiment, such as Figure 4As shown, the second radiating branch 120 has a first grounding end (D1 in the figure) and a second free end (Z2 in the figure), and a gap is formed between the second free end and the first free end. The first grounding end is located on the side of the second free end away from the gap.

[0055] The first projection plane is a plane perpendicular to the extension direction of the first radiating stub 110 (projection plane S1 in the figure, indicated by a dashed line). The projection of the first end face of the first free end near the second radiating stub 120 (D1 in the figure) onto the first projection plane at least partially overlaps with the projection of the second end face of the second free end near the first radiating stub 110 (D2 in the figure) onto the first projection plane (the figure shows complete overlap as an example). This can increase the coupling area of ​​the first radiating stub 110 and the second radiating stub 120 in the extension direction of the first radiating stub 110. The increased coupling area can further increase the coupling amount of the second radiating stub 120 to the first radiating stub 110. On the one hand, it can improve the radiation efficiency and impedance bandwidth of the first radiating stub 110. On the other hand, it can further weaken the interference between the first radiating stub 110 and the second antenna 20 when they operate at the same or adjacent frequencies, thus improving the isolation.

[0056] It is understandable that before the coupling amount reaches the coupling threshold, increasing the coupling amount is more beneficial to improving the isolation between the first antenna 10 and the second antenna 20. After the coupling amount reaches the coupling threshold, if the coupling amount continues to increase, the isolation remains unchanged, but the frequency of the first antenna 10 can be adjusted to shift to a lower frequency. Therefore, after the coupling amount reaches the coupling threshold, it can be determined whether to continue to increase the coupling amount according to actual needs.

[0057] In one embodiment, such as Figure 5 As shown, the first radial branch 110 includes a first branch 111 and a second branch 112 that are connected. The second branch 112 is located at the first free end and is perpendicular to the first branch 111. The second radial branch 120 includes a third branch 121 and a fourth branch 122 that are connected. The fourth branch 122 is perpendicular to the third branch 121. The fourth branch 122 is close to the second branch 112 and forms the gap between them. In the direction perpendicular to the first branch 111 (which is parallel to the projection plane S1 in the figure), the size of the second branch 112 is larger than the size of the first branch 111, and the size of the fourth branch 122 is larger than the size of the third branch 121.

[0058] Therefore, the projected area of ​​the second branch 112 on the first projection plane is greater than that of the first branch 111 on the first projection plane, and the projected area of ​​the fourth branch 122 on the first projection plane is greater than that of the third branch 121 on the first projection plane. Relative to the first branch 111, the increased projected area of ​​the second branch 112 leads to a corresponding increase in the coupling area between the first radiating branch 110 and the second radiating branch 120, and consequently, a corresponding increase in the coupling amount. Similarly, relative to the third branch 121, the increased projected area of ​​the fourth branch 122 also leads to a corresponding increase in the coupling area between the first radiating branch 110 and the second radiating branch 120, and consequently, a corresponding increase in the coupling amount.

[0059] In one embodiment, such as Figure 6 , Figure 7 As shown, the plane parallel to the extension direction of the first radiating branch 110 is taken as the second projection plane (projection plane S2 in the figure, indicated by a dashed line). The projection of the first radiating branch 110 on the second projection plane at least partially overlaps with the projection of the second radiating branch 120 on the second projection plane. This can increase the coupling area of ​​the first radiating branch 110 and the second radiating branch 120 in the direction perpendicular to the floor. The increased coupling area can further increase the coupling amount of the second radiating branch 120 to the first radiating branch 110. On the one hand, it can improve the radiation efficiency and impedance bandwidth of the first radiating branch 110. On the other hand, it can further weaken the interference between the first radiating branch 110 and the second antenna 20 when they operate at the same or adjacent frequencies, thereby improving the isolation.

[0060] In one embodiment, the first frequency band and the second frequency band are co-frequency bands of different standards. For example, the first frequency band is a WIFI / BT band, and the second frequency band is an MHB band. Therefore, the antenna module can support co-frequency bands of different standards, covering adjacent WIFI / BT and MHB bands, meeting users' WIFI / BT and cellular communication needs. Optionally, the first frequency band includes at least one of WIFI / BT 2.4G and WIFI / BT 5G bands; the second frequency band includes at least one of a mid-frequency band and a high-frequency band. For example, the first frequency band can be WIFI 2.4G, and the second frequency band can be a mid-frequency band.

[0061] In one embodiment, such as Figure 8 As shown, the antenna module also includes a tuning circuit 130.

[0062] The tuning circuit 130 is connected to the feed terminal and the first feed source S1 respectively, and is used to tune the first feed signal so that the first antenna 10 operates in a resonant mode that supports the first frequency band.

[0063] Tuning can be understood as resonance adjustment, including adjusting at least one of the resonant frequency, resonance depth, and frequency offset of the resonant mode. This adjustment can be achieved by configuring the circuit parameters of the tuning circuit 130. For example, by configuring the circuit parameters of the tuning circuit 130, the resonant frequency of each resonant mode can be tuned, thereby exciting the first antenna 10 to operate in the first frequency band of the target. Different circuit parameters correspond to different first frequency bands. The electrical connection methods between the tuning circuit 130 and the feed terminal include, but are not limited to, direct welding, or methods via coaxial lines, microstrip lines, conductive springs, etc.

[0064] Optionally, the tuning circuit 130 may include a unit with tuning function composed of components such as capacitors and inductors. The circuit parameters can be understood as tuning parameters formed by the combination of equivalent capacitance, equivalent inductance, etc., obtained after the actual connection of the internal components of the tuning circuit 130. For example, Figure 9 As shown, the tuning circuit 130 may include capacitors C1 and C2. The parallel capacitor C2 near the feed end is mainly used to adjust the frequency offset. When the antenna size is large enough and the resonance is too low, capacitor C2 can be replaced with an inductor. The value of capacitor C1 is related to the resonant frequency. Taking WIFI 2.4G as an example, the capacitance value of C1 is between 0.5pF and 1pF. After capacitor C1 is connected in series, other matching circuits can also be added as needed for tuning.

[0065] In one embodiment, the second feed signal is also used to excite the third radiating stub 210 to support the transmission of the third frequency band signal. The third frequency band is in a different frequency range from the second frequency band, so that the second antenna 20 can support multiple frequency bands and broaden its bandwidth. Optionally, the second frequency band may include a mid-to-high frequency band, and the third frequency band may include an ultra-high frequency band, for example, the N78 band. Thus, the second antenna 20 can cover important frequency bands such as the MHB band and the N78 band.

[0066] In one embodiment, there are two first antennas 10, located on opposite sides of the second second antenna 20. The openings of the first radiating branches 110 in both first antennas 10 face away from the second second antenna 20, and each first antenna 10 has a high degree of isolation from the second second antenna 20. The three-antenna architecture enables the antenna module to support communication functions in both the first and second frequency bands.

[0067] It should be noted that the antenna form of the second antenna 20 in the above embodiments is not limited. The opening of the second antenna 20 can face the first antenna 10 or face away from the first antenna 10. Taking the opening of the second antenna 20 facing the first antenna 10 as an example, ... Figure 10As shown, the third radiating stub 210 has a third free end (Z3 in the figure), a second ground end (D2 in the figure), and a feed point (KD in the figure) located between the third free end and the second ground end. The third free end and the feed end are spaced apart, and the second ground end is located on the side of the third free end away from the feed end.

[0068] It should be noted that the free end in the above embodiments can be understood as an open end, an open circuit end, or an open terminal; the feed end can be understood as the feed point used to connect the feed source located at the end of the radiating stub; the ground end can be understood as the ground point used to connect the ground to the floor located at the end of the radiating stub. The end can be understood as the end of the radiating stub, or it can be understood as a section of the radiating stub including the end.

[0069] It is understood that the antennas in the above embodiments can be any of the following: metal antenna, metal frame antenna, flexible printed circuit (FPC) antenna, laser direct structural (LDS) antenna, and printed direct structural (PDS) antenna. In this application embodiment, the form of the antenna architecture is not further limited. For ease of explanation, the schematic diagrams in the above embodiments are mainly illustrated using a metal antenna as an example.

[0070] It is understood that in other embodiments, when the antenna module includes multiple antennas supporting the first frequency band, it is not necessary for all antennas to adopt the antenna form of the first antenna 10. It is also understood that in other embodiments, depending on the frequency band requirements, more antennas can be provided to support more frequency bands, or multiple antennas can support transmission and reception in the same frequency band.

[0071] For example, in a multi-antenna architecture where multiple antennas support transmission and reception in the same frequency band, there may be multiple antennas supporting a first frequency band and multiple antennas supporting a second frequency band. Taking the first frequency band as the WIFI band and the second frequency band as the MHB band as an example, in this embodiment, the first antenna 10 can serve as a master MIMO (Multiple Input Multiple Output) receiving antenna for the WIFI band, and the second antenna 20 can serve as a master MIMO receiving antenna for the MHB band. For example, in a multi-antenna architecture where multiple antennas support transmission and reception in multiple frequency bands, there may be antennas supporting frequency bands such as GPS L1.

[0072] This application also provides an electronic device, including: a ground plane; and an antenna module as described in any one or more of the above embodiments, with each ground terminal connected to the ground plane. The antenna module in the electronic device has a simple structure, high isolation, and high radiation efficiency, which is beneficial for improving the communication function of the electronic device.

[0073] In one embodiment, the electronic device further includes a mid-frame, comprising an interconnected frame and a mid-plate, the mid-plate forming the floor as described in the above embodiment. Optionally, the mid-frame can be formed by any feasible process, such as CNC L-shaped splicing, CNC die casting, MDA, etc.

[0074] like Figure 11 As shown, the middle frame 30 includes a middle plate 310 and a top frame 321, a first side frame 323, a bottom frame 322 and a second side frame 324 that are connected sequentially from end to end on the side of the middle plate 310. A corner is formed between adjacent frames, and the middle plate 310 forms a floor (not shown in the figure).

[0075] In the above embodiments, the first antenna and the second antenna can be at least partially located on the same frame. For example, the first antenna and the second antenna can be located on the first side frame 323 respectively. When there are two first antennas, one of the first antennas can be located at the corner between the top frame 321 and the first side frame 323, and the other first antenna and the second antenna can be located on the first side frame 323.

[0076] The middle board 310 can be used to install electronic components such as batteries, motherboards, and camera modules for electronic devices. The motherboard can integrate electronic components such as processors, storage units, power management modules, and baseband chips for electronic devices. The motherboard can be a PCB (Printed Circuit Board) or an FPC (Flexible Printed Circuit). In the above embodiment, the ground plane can be a metal ground plane on the motherboard, thereby providing a ground plane. Radio frequency circuits for processing radio frequency signals can be integrated on the circuit board, as well as controllers that control the operation of electronic devices.

[0077] The above embodiments are further described below using relevant technical embodiments and optional embodiments of this application:

[0078] Related technical embodiments, such as Figure 12 As shown, a WIFI antenna, an MHB antenna, and another WIFI antenna are formed on the side frame. Two WIFI antennas are distributed on both sides of the MHB antenna. When the antenna opening of the MHB antenna faces downward, it is opposite to the opening direction of the WIFI antenna, and the mutual influence is relatively large. If the distance between the MHB antenna and the WIFI antenna is increased, the distance between the MHB antenna and the other WIFI antenna will be too close, and the mutual influence between them will increase.

[0079] like Figure 13As shown, in this layout, the isolation between the 2.4G Wi-Fi and the MHB band at the same frequency is nearly -6dB, while the mutual interference reaches 2dB. To improve Wi-Fi performance, it is often necessary to sacrifice the performance of the MHB band to reduce the impact. When the motherboard needs to be further narrowed, and this Wi-Fi antenna is moved further upward, the interference with the MHB antenna will increase further, resulting in severe performance degradation.

[0080] Optional embodiments of this application, such as Figure 14 As shown, a first antenna 10 and a second antenna 20 are formed on the side frame. The first antenna 10 supports the 2.4G / 5G WIFI band, and the second antenna 20 supports the MHB band. The first antenna 10 is a WIFI antenna based on a parasitic stub strong coupling form, with the antenna opening facing downwards. Figure 12 The comparison shown demonstrates that the Wi-Fi antenna has better isolation from surrounding antennas, reducing mutual interference. Furthermore, Wi-Fi antenna performance can be maintained even with further reductions in motherboard length.

[0081] Figure 14 The WIFI antenna opening faces downwards, and the gap between the main branch and the parasitic branch is small, increasing the coupling. The radiation mode is the full-arm ICE mode. The radiation position is far away from the second antenna 20, and the co-frequency isolation with the second antenna 20 is good.

[0082] like Figure 15 , Figure 16 The image shows a simulation diagram of the current distribution in an electronic device during WIFI 2.4G. Figure 17 , Figure 18 The image shows a simulation diagram of the current distribution in an electronic device during WIFI 5G operation. Figures 15-18 As shown, the current flows in the same direction in the two radiating branches of the first antenna 10. Except for the first feed S1 (where the feed provides the power signal, so the current intensity is generally strong), the gap between the first radiating branch 110 and the second radiating branch 120 is very small, and the current is equivalent to a direct current. The entire arm of the first antenna 10 forms a current, and the current intensity is relatively uniform in most positions.

[0083] like Figure 19 and Figure 20 The figure shows the results for isolation and antenna efficiency. Figure 19 As shown, using the ICE mode radiation pattern, the isolation between the first antenna 10 and the second antenna 20 was optimized from -6dB to -16dB, significantly improving the mutual interference between the antennas. Figure 20 As shown, the efficiency of two antennas can be improved simultaneously.

[0084] The antenna module and electronic equipment provided in this embodiment can improve the problem of efficiency reduction caused by the mutual interference between the WIFI antenna and the MHB antenna; and solve the problem of difficulty in designing WIFI MIMO antenna when the motherboard length is too narrow due to the increase in battery capacity.

[0085] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0086] The above embodiments merely illustrate several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. An antenna module, characterized in that, include: The first antenna includes a first radiating stub, a second radiating stub, and a first feed source. The first radiating stub has a first free end and a feed end. A gap is formed between the first free end and the second radiating stub. The feed end is located on the side of the first free end away from the gap, and the feed end is connected to the first feed source. The second antenna includes a third radiating stub and a second feed connected together. The third radiating stub is located on the side of the feed end away from the gap and is spaced apart from the first antenna. The first feed source is used to output a first feed signal to excite the first radiating stub and the second radiating stub to perform slot coupling and jointly support the transmission of the first frequency band signal; the second feed source is used to output a second feed signal to excite the third radiating stub to support the transmission of the second frequency band signal; the first frequency band and the second frequency band are respectively within a preset frequency range.

2. The antenna module according to claim 1, characterized in that, The first feed signal is used to excite the gap coupling between the first radiating stub and the second radiating stub to generate a first current distributed on the entire arm of the first radiating stub and a second current distributed on the entire arm of the second radiating stub. The first current and the second current flow in the same direction, and the difference in current intensity between the first current and the second current is within a preset range.

3. The antenna module according to claim 2, characterized in that, The radiation mode corresponding to the gap coupling between the first and second radiating stubs is the inductive coupling excitation mode of the entire arm.

4. The antenna module according to claim 1, characterized in that, The first radiating branch extends in the same direction as the second radiating branch, and the extension dimension of the first radiating branch is greater than that of the second radiating branch.

5. The antenna module according to claim 1, characterized in that, The first radial branch includes a first branch and a second branch that are connected, the second branch being located at the first free end and perpendicular to the first branch; the second radial branch includes a third branch and a fourth branch that are connected, the fourth branch being perpendicular to the third branch; The fourth branch is close to the second branch and forms the gap between them; in the direction perpendicular to the first branch, the size of the second branch is larger than the size of the first branch, and the size of the fourth branch is larger than the size of the third branch.

6. The antenna module according to claim 1, characterized in that, The projection of the first radiating branch onto the projection plane at least partially coincides with the projection of the second radiating branch onto the projection plane, and the projection plane is parallel to the extension direction of the first radiating branch.

7. The antenna module according to claim 1, characterized in that, The first frequency band and the second frequency band are co-frequency bands of different standards.

8. The antenna module according to claim 7, characterized in that, The first frequency band includes at least one of the WIFI / BT 2.4G and WIFI / BT 5G frequency bands; the second frequency band includes at least one of the mid-frequency band and the high-frequency band.

9. The antenna module according to claim 1, characterized in that, The antenna module also includes: A tuning circuit, connected to the feed terminal and the first feed source respectively, is used to tune the first feed signal so that the first antenna operates in a resonant mode that supports the first frequency band.

10. The antenna module according to any one of claims 1-9, characterized in that, The second feed signal is also used to excite the third radiating stub to support the transmission of the third frequency band signal, which is in a different frequency range from the second frequency band.

11. The antenna module according to any one of claims 1-9, characterized in that, There are two first antennas, which are located on either side of the second antenna.

12. An electronic device, characterized in that, include: floor; In the antenna module as described in any one of claims 1-11, each ground terminal is connected to the ground plane.

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