Antenna device and electronic equipment

Abstract

The embodiment of the invention provides an antenna device and electronic equipment. The antenna device comprises a floating branch knot, a first radiating body and a second radiating body, a first gap is formed between the first radiator and the second radiator; a first short-circuit branch of the first radiator is arranged at one end, close to the first gap, of the first radiation branch; a first feed branch is arranged beside the first short-circuit branch and is far away from the first gap; a second short-circuit branch of the second radiator is arranged at one end, close to the first gap, of the second radiation branch; a second feed branch is arranged beside the second short-circuit branch and is far away from the first gap; the floating branch forms a second gap with the first radiation branch and the second radiation branch. The first radiator and the second radiator are electromagnetically coupled with the floating branch through the second gap. According to the invention, the floating branch knot is arranged on the two radiators in a spaced manner, so that the current of one radiator entering the other radiator during radiation is reduced, and the isolation of multiple antennas in a designed frequency band is effectively reduced.

Description

Technical Field

[0001] The embodiments of the present invention relate to the field of wireless communication technology, and in particular to an antenna device and an electronic device. Background Art

[0002] As people's demand for high-speed data transmission increases, how to effectively improve the transmission rate of electronic devices under limited bandwidth is a very important research topic. The multiple-input multi-output (MIMO) antenna system is one of the main core technologies at present. The MIMO antenna system increases the number of antennas at the transmitting and receiving ends, and transmits and receives data at the same time to greatly improve the transmission rate.

[0003] However, in MIMO antenna design, dual antennas are often placed on the upper side of electronic equipment, and antennas with the same frequency are arranged adjacent to each other and at a close distance. The isolation of the dual antennas will be greatly improved, which will cause coupling problems and affect the effective radiation of the antenna. Summary of the invention

[0004] In view of this, an embodiment of the present invention provides an antenna device and an electronic device, which can effectively reduce the isolation between dual antennas within a designed frequency band, reduce antenna mutual coupling, and thus improve communication quality.

[0005] In a first aspect, an embodiment of the present invention provides an antenna device, wherein the antenna device comprises: a floating branch, a first radiator, and a second radiator;

[0006] Wherein, a first gap is formed between the first radiator and the second radiator;

[0007] The first radiator comprises a first short-circuit branch, a first feeding branch and a first radiating branch, wherein the first short-circuit branch is arranged at one end of the first radiating branch close to the first gap, and the first feeding branch is arranged beside the first short-circuit branch and away from the first gap;

[0008] The second radiator comprises a second short-circuit branch, a second feeding branch and a second radiating branch, wherein the second short-circuit branch is arranged at one end of the second radiating branch close to the first gap, and the second feeding branch is arranged beside the second short-circuit branch and away from the first gap;

[0009] The floating branch forms a second gap with the first radiation branch and the second radiation branch, and the first radiator and the second radiator are electromagnetically coupled with the floating branch through the second gap.

[0010] In a possible implementation, the first radiator is at least one of the following: an inverted F structure, a ring structure, and a monopole-ground parasitic structure;

[0011] The second radiator is at least one of the following: an inverted F structure, a ring structure, and a monopole-ground parasitic structure.

[0012] In a possible implementation manner, the first radiator and the second radiator are the same structure, and when the first radiator and the second radiator are symmetrical along the first gap direction, the floating branches are symmetrical along the first gap direction.

[0013] In a possible implementation manner, the length of the floating branch is one quarter to one half of the wavelength corresponding to the resonance point generated by the first radiator or the second radiator.

[0014] In a possible implementation manner, the antenna device further includes a first feeding unit and a second feeding unit;

[0015] The first short-circuit branch is grounded, and the first feeding branch is connected to the first feeding unit; the second short-circuit branch is grounded, and the second feeding branch is connected to the second feeding unit.

[0016] In a possible implementation, the floating branches are in a zigzag or straight line shape.

[0017] In a second aspect, an embodiment of the present invention provides an electronic device, wherein the electronic device includes the above-mentioned antenna device.

[0018] In a possible implementation, the electronic device further includes a housing and a mainboard, and the mainboard includes an antenna bracket;

[0019] The floating branches, the first radiator and the second radiator of the antenna device are arranged on the inner shell surface of the shell or on the antenna bracket.

[0020] In a possible embodiment, the first radiator and the second radiator of the antenna device are arranged on the inner shell surface of the shell, and the floating branch of the antenna device is arranged on the antenna bracket, so that the plane where the floating branch is located is at a preset angle with the plane where the first radiating branch and the second radiating branch are located.

[0021] In a possible embodiment, the first radiator and the second radiator of the antenna device are arranged on the antenna bracket, and the floating branches of the antenna device are arranged on the inner shell surface of the shell, so that the plane where the floating branches are located is at a preset angle with the plane where the first radiating branches and the second radiating branches are located.

[0022] An antenna device and an electronic device provided by an embodiment of the present invention, the antenna device includes a floating branch, a first radiator and a second radiator; wherein a first gap is formed between the first radiator and the second radiator; the first radiator includes a first short-circuit branch, a first feeding branch and a first radiating branch, the first short-circuit branch is arranged at one end of the first radiating branch close to the first gap, and the first feeding branch is arranged beside the first short-circuit branch and away from the first gap; the second radiator includes a second short-circuit branch, a second feeding branch and a second radiating branch, the second short-circuit branch is arranged at one end of the second radiating branch close to the first gap, and the second feeding branch is arranged beside the second short-circuit branch and away from the first gap; the floating branch forms a second gap with the first radiating branch and the second radiating branch, and the first radiator and the second radiator are electromagnetically coupled with the floating branch through the second gap. The present invention can set a floating branch structure near two radiators through a floating metal process, so that the current of one radiator entering another radiator when radiating is reduced, the isolation of multiple antennas within the designed frequency band is improved, and the current coupling between multiple antennas is effectively reduced, thereby improving the radiation efficiency of multiple antennas and improving communication quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic structural diagram of an antenna device provided by an embodiment of the present invention;

[0024] Figure 2 A schematic diagram of an antenna form of an antenna device provided by an embodiment of the present invention;

[0025] Figure 3 A schematic diagram of an antenna form of another antenna device provided by an embodiment of the present invention;

[0026] Figure 4 A schematic diagram of an antenna form of another antenna device provided by an embodiment of the present invention;

[0027] Figure 5 A current distribution diagram of an antenna device provided by an embodiment of the present invention;

[0028] Figure 6 A vector current distribution diagram of an antenna device provided by an embodiment of the present invention;

[0029] Figure 7 A curve diagram of an S parameter simulation result provided by an embodiment of the present invention;

[0030] Figure 8 A curve diagram of another S parameter simulation result provided by an embodiment of the present invention;

[0031] Fig. 9 A curve diagram of another S parameter simulation result provided by an embodiment of the present invention;

[0032] Fig.10 A curve diagram of another S parameter simulation result provided by an embodiment of the present invention;

[0033] Fig.11 A schematic diagram of the structure of another antenna device provided by an embodiment of the present invention;

[0034] Fig.12 A schematic diagram of the structure of an electronic device provided by an embodiment of the present invention;

[0035] Fig.13 A schematic diagram of an antenna form of another antenna device provided by an embodiment of the present invention;

[0036] Fig.14 A curve chart of another S parameter simulation result provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] For the problem of dual-antenna current coupling in MIMO antenna design, the existing decoupling methods mainly include two categories: physical isolation and field cancellation. Physical isolation is achieved by directly increasing the unit spacing, polarization orthogonal arrangement, etc.; field cancellation mainly suppresses mutual coupling by introducing indirect coupling fields or coupling currents to cancel out the direct coupling fields or coupling currents of the antenna itself.

[0039] However, the physical isolation method often requires a large space by increasing the antenna spacing, such as placing two antennas back to back or adding an isolation ground, and the decoupling effect on closely arranged electronic devices is very limited. The field cancellation method often requires a complex feeding structure, which is not conducive to miniaturized electronic devices, and the bandwidth is usually narrow, and decoupling is mostly achieved for two antennas with exactly the same shape and structure. In response to the above problems, the present invention provides an antenna device and an electronic device, which can be configured with multiple antennas in a compact arrangement and the same or different shapes and structures. A floating branch structure is set near two radiators through a floating metal process, so that the current of one radiator entering another radiator is reduced, the isolation of multiple antennas within the designed frequency band is improved, and the current coupling between multiple antennas is effectively reduced while widening the working bandwidth of the antenna, which can greatly improve the radiation efficiency of multiple antennas and thus improve the communication quality.

[0040] To facilitate understanding of the embodiments of the present invention, specific embodiments will be further explained below in conjunction with the accompanying drawings. The embodiments do not constitute a limitation on the embodiments of the present invention.

[0041] An embodiment of the present invention provides an antenna device, referring to Figure 1 , Figure 1 It is a schematic structural diagram of an antenna device provided in an embodiment of the present invention. The antenna device includes a floating branch 100 , a first radiator 101 and a second radiator 102 .

[0042] The above-mentioned floating branch 100, the first radiator 101 and the second radiator 102 are all made of conductive materials, and, in the description of the present application, it should be understood that terms such as "first" and "second" are only used to distinguish similar objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features.

[0043] like Figure 1 As shown, a first gap 10 is formed between the first radiator 101 and the second radiator 102. The first radiator 101 includes a first short-circuit branch 103, a first feeding branch 104 and a first radiating branch 105. The first short-circuit branch 103 is arranged at one end of the first radiating branch 105 close to the first gap 10, and the first feeding branch 104 is arranged beside the first short-circuit branch 103 and away from the first gap 10. The second radiator 102 includes a second short-circuit branch 106, a second The feeding branch 107 and the second radiating branch 108, the second short-circuit branch 106 are arranged at one end of the second radiating branch 108 close to the first gap 10, and the second feeding branch 107 is arranged beside the second short-circuit branch 106 and away from the first gap 10; the floating branch 100 and the first radiating branch 106 and the second radiating branch 109 form a second gap 20, and the first radiator 101 and the second radiator 102 realize electromagnetic coupling with the floating branch 100 through the second gap 20.

[0044] The above-mentioned first short-circuit branch 103 is arranged at one end of the first radiating branch 105 close to the first gap 10. Specifically, the first short-circuit branch 103 can be arranged at the end of the first radiating branch 105 close to the first gap 10, or, the first short-circuit branch 103 can be arranged at a preset position of the first radiating branch 105 close to the first gap 10. The preset position can be set according to actual needs and is not limited here. The first feeding branch 104 of the first radiator 101 is arranged at a position away from the first gap 10 compared to the first short-circuit branch 103; similarly, the position setting of the second short-circuit branch 106 on the second radiating branch 108 is the same as the position setting of the first short-circuit branch 103 on the first radiating branch 105, and the position setting of the second feeding branch 107 is the same as the position setting of the first feeding branch 104, which will not be repeated here.

[0045] In this embodiment, one end of the first radiating branch 105 provided with the first short-circuit branch 103 is regarded as a closed-circuit end, and the other end of the first radiating branch 105 is regarded as an open-circuit end. Similarly, one end of the second radiating branch 108 provided with the second short-circuit branch 106 is regarded as a closed-circuit end, and the other end of the second radiating branch 108 is regarded as an open-circuit end. Since the open-circuit ends of the radiating branches corresponding to the first radiator 101 and the second radiator 102 face opposite to each other, the first radiator 101 and the second radiator 102 are placed "back to back"; and since the short-circuit branches of the first radiator 101 and the second radiator 102 are both at the closed-circuit ends of the corresponding radiating branches, which are farther away from the open-circuit ends of the radiating branches than the corresponding feeding branches, the first radiator 101 and the second radiator 102 can be regarded as radiators, i.e., antennas, of a "ground-feed" structure.

[0046] Since the first radiator 101 and the second radiator 102 are both structures of the “ground-enclosed-feed” type, the first radiator 101 and the second radiator 102 may be any one of the structures of the “ground-enclosed-feed” type, wherein the structure of the “ground-enclosed-feed” type may be an inverted-F structure, a ring structure, a monopole-ground parasitic structure, and may also have a deformed structure corresponding to each structure. Optionally, the first radiator 101 is at least one of the following: an inverted-F structure, a ring structure, a monopole-ground parasitic structure; the second radiator 102 is at least one of the following: an inverted-F structure, a ring structure, a monopole-ground parasitic structure.

[0047] The above-mentioned monopole-ground parasitic structure is composed of a monopole structure and a ground parasitic structure, the ground parasitic structure is composed of a short-circuit branch and a third radiation branch, the short-circuit branch is arranged at one end of the third radiation branch close to the first gap, the monopole structure is composed of a feeding branch and a fourth radiation branch, the feeding branch is arranged on the fourth radiation branch and is farther away from the first gap than the short-circuit branch, wherein the third radiation branch is higher than the fourth radiation branch, and the third radiation branch is parallel to the fourth radiation branch. In this embodiment, the third radiation branch and the fourth radiation branch are collectively regarded as the second radiation branch, the above-mentioned short-circuit branch is the second short-circuit branch, and the feeding branch is the second feeding branch.

[0048] In actual use, the structures of the first radiator 101 and the second radiator 102 may be completely the same or different. For the sake of convenience, Figure 2 It is shown that the first radiator 101 and the second radiator 102 are both inverted F structures. Figure 3 It is shown in FIG. 1 that the first radiator 101 is an inverted F structure, and the second radiator 102 is a ring structure. Figure 4 2 shows that the first radiator 101 is an inverted-F structure, and the second radiator 102 is a monopole-ground parasitic structure.

[0049] Apart from Figures 2 to 4 In addition to the two radiator structures shown, in one embodiment, the first radiator 101 and the second radiator 102 can also be both ring structures or both monopole-ground parasitic structures. In another embodiment, the first radiator 101 is a ring structure, and the second radiator 102 is an inverted-F structure or a monopole-ground parasitic structure. In another embodiment, the first radiator 101 is a monopole-ground parasitic structure, and the second radiator 102 is an inverted-F structure or a ring structure.

[0050] The width of the first gap 10 may be the linear distance between the closest point between the first radiator 101 and the second radiator 102. The width of the second gap 20 may be the linear distance between the floating branch 100 and the closest point between the first radiator 101 and the second radiator 102 in the horizontal direction.

[0051] When the width of the first gap 10 between the first radiator 101 and the second radiator 102 increases, the isolation is better, and vice versa, the isolation is worse. The width of the second gap 20 between the floating branch 100 and the first radiator 101 and the second radiator 102 in the horizontal direction plus the width of the floating branch is less than 1 mm. Since the added floating branch occupies very little space, the space occupied by the two radiators is also not large, so the antenna device can be compactly arranged in a small space. It should be understood that in this embodiment, the specific values ​​of the width of the first gap 10, the width of the second gap 20, or the width of the floating branch are not limited, and can be adjusted according to actual design or production needs.

[0052] It can be understood that, since the first radiator 101 and the second radiator 102 are at a relatively short distance from the floating branch 100 , the first radiator 101 and the second radiator 102 can achieve electromagnetic coupling with the floating branch 100 through the second gap 20 .

[0053] For example, when a radio frequency signal is fed into the first radiator 101, the second radiator 102 generates a first induced current through direct coupling with the first radiator 101, and generates a second induced current through indirect coupling with the floating branch 100. The distribution of the first induced current on the second feeding branch 107 is close in magnitude to the distribution of the second induced current on the second feeding branch, but in opposite directions. Therefore, the current from the first radiator 101 entering the second radiator 102 is greatly reduced, thereby improving the isolation of multiple antennas within the designed frequency band and effectively reducing the current coupling between the multiple antennas.

[0054] For ease of understanding, Figure 5 (a) and Figure 5 (b) are respectively Figure 2The current distribution of the two inverted F structure radiators at two resonant frequencies of 3.6 GHz and 3.86 GHz is shown in FIG. 1 . The sparser the black dots, the smaller the current, and the denser the black dots, the larger the current. Figure 5 It can be seen that when the first radiator 101 on the left is fed, the current entering the second radiator is very small, due to the symmetric structure, and vice versa.

[0055] When the first radiator 101 is fed with a radio frequency signal, a current, namely a third induced current, is also generated on the floating branch 100. For ease of understanding, Figure 6 shows a vector current distribution diagram, Figure 6 The two radiators in are both inverted F structure radiators. Figure 6 The direction of the arrow is the direction of current flow. Figure 6 The arrows in the figure show that a current is also generated on the floating branch 100. When the first induced current, the second induced current on the second radiator 102 and the third induced current on the floating branch 100 are vector-superimposed, resonance is generated at a certain frequency. This resonance frequency is close to but different from the resonance frequency generated by the fourth induced current generated by the feeding on the first radiator 101 alone, thereby widening the frequency bandwidth of the first radiator 101. Similarly, when a radio frequency signal is fed to the second radiator 102, the frequency bandwidth of the second radiator 102 can also be widened through the floating branch 100 and the first radiator 101.

[0056] Figure 7 4 is a schematic diagram comparing S parameters of different antenna devices provided in an embodiment of the present application.

[0057] in, Figure 7 (a) is the simulation result of the antenna device without adding floating branches. Figure 7 (b) is the simulation result of the antenna device with floating branches added. Figure 7 (a) and Figure 7 (b) The corresponding antenna devices each include two radiators of an inverted F structure, and the first gap between the two radiators is 8 mm, wherein: Figure 7 (b) The width of the floating branch in the corresponding antenna device is 0.3 mm, the second gap is 0.5 mm, and the length of the floating branch is 27 mm.

[0058] Depend on Figure 7 From the simulation results of the S parameters, it can be seen that when the antenna device does not add floating branches, since the two radiators are symmetrical structures, S11 is the same as S22, and S21 is the same as S12. Figure 7 (a) It can be seen that the -6dB bandwidth only covers 3.6GHz-3.8GHz, and the isolation is less than 15dB in this range. Such low isolation will affect the performance of the antenna; Figure 7(b) It can be seen that the -6dB bandwidth can cover 3.3GHz-4.2GHz, and the isolation is higher than 15dB in this range, which meets the requirements.

[0059] observe Figure 7 (b) two resonance points, and combined Figure 6 It can be inferred that the resonance source at the lower frequency is the radiation generated by the floating branch and the second short-circuit branch 106 of the second radiator 102. The second feeding branch 107 of the second radiator 102 is removed, and the S11-1 obtained by simulating this model is compared with the S11 of the single first radiator 101 of the inverted F structure working alone. Figure 8 It can be seen that the floating branch 100 and the second short-circuit branch 106 produce a bandwidth widening effect.

[0060] Fig. 9 It is a schematic diagram comparing S parameters of different antenna devices provided in yet another embodiment of the present application.

[0061] in, Fig. 9 (a) is a simulation result diagram of an antenna device without adding floating branches. In the antenna device corresponding to the simulation result diagram, the first radiator 101 is an inverted F structure, and the second radiator is a ring structure. Fig. 9 (b) is a simulation result diagram of an antenna device with floating branches added. The antenna device corresponding to the simulation result diagram is shown in FIG. Figure 3 As shown. Fig. 9 (a) and Fig. 9 (b) It can be seen that the antenna pair with the floating branch adds a resonance point, thereby widening the frequency bandwidth and causing a significant depression in its coupling curve, reducing the isolation.

[0062] For Figure 4 The antenna device shown is simulated to obtain its S parameters as follows Fig.10 As shown, the S11 and S22 curves of the two radiators respectively show that the antennas have two resonance points, and the S12 and S21 curves have obvious depressions at the peaks, which effectively reduces the isolation.

[0063] It should be understood that the antenna device provided in this embodiment can be used in a configuration where multiple antennas are compactly arranged and the shapes and structures of the multiple antennas are the same or different. A floating branch structure is set near two radiators through a floating metal process, so that the current of one radiator entering another radiator is reduced, the isolation of the multiple antennas within the designed frequency band is improved, the current coupling between the multiple antennas is effectively reduced, and the working bandwidth of the antenna is widened, which can greatly improve the radiation efficiency of the multiple antennas and thus improve the communication quality.

[0064] In one embodiment, the first radiator 101 and the second radiator 102 are of the same structure, and when the first radiator 101 and the second radiator 102 are symmetrical along the first gap 10, the floating branch 100 is symmetrical along the first gap 10. It should be understood that the symmetrical structure of the two radiators has better antenna performance.

[0065] The direction of the first gap 10 may refer to the direction in which the plane where the first gap 10 is located is perpendicular to the first gap 10. When the first radiator 101 and the second radiator 102 are different structures, it is not limited to that the floating branches 100 are symmetrical along the first gap direction, that is, the floating branches 100 may be symmetrical along the first gap direction or not, which is not limited here.

[0066] Optionally, the length of the floating branch 100 is one quarter to one half of the wavelength corresponding to the resonance point of the resonance generated by the first radiator 101 or the second radiator 102. It should be understood that the resonance point may refer to the resonance point of the resonance generated by the first radiator 101, or the resonance point generated by the second radiator 102, or it may also be the center frequency point of the working frequency band of the radiator. It should be understood that the length of the floating branch 100 can control the isolation between each feeding point. In order to meet the index requirements of radiators with different structures, the length of the floating branch 100 can be adjusted, that is, the length of the floating branch 100 is related to the working frequency of the radiator. When the frequency is determined, the optimized length can be roughly determined, and the specific length of the floating branch is not limited here.

[0067] In one embodiment, the antenna device further includes a first feeding unit and a second feeding unit; Figure 1 Based on Fig.11 The first short-circuit branch 103 is grounded, the first feeding branch 104 is connected to the first feeding unit 1101 , the second short-circuit branch 106 is grounded, and the second feeding branch 107 is connected to the second feeding unit 1102 .

[0068] Figures 2 to 4 The black area under the first feeding branch 104 is the first feeding unit 1101, and the black area under the second feeding branch 107 is the second feeding unit 1102. The first feeding unit 1101 provides energy to the first radiator 101 to form a first antenna, and the second feeding unit 1102 provides energy to the second radiator 102 to form a second antenna, and wireless communication is achieved based on the first antenna and the second antenna.

[0069] In actual use, the floating branches can be in a zigzag shape or a straight line shape, which is related to the actual installation space. When the space is limited, the floating branches are bent. When the space is sufficient, the floating branches can be left unbent. The shape of the floating branches is not limited here.

[0070] An embodiment of the present invention provides an electronic device, wherein the electronic device includes the above-mentioned antenna device.

[0071] The electronic device in this embodiment can be a mobile phone, a tablet computer, a laptop computer, a smart bracelet, a smart watch, a smart helmet, smart glasses, etc. The electronic device can also be a cellular phone, a cordless phone, a session initiation protocol (SIP) phone, a wireless local loop (WLL) station, a personal digital assistant (PDA), a handheld device with wireless communication function, a computing device or other processing device connected to a wireless modem, a vehicle-mounted device, a terminal device in a 5G network or a terminal device in a public land mobile network (PLMN) to be evolved in the future, etc., which is not limited in this embodiment.

[0072] Since the electronic device is installed with an antenna device having high isolation characteristics and frequency bandwidth widening characteristics, the electronic device has good communication quality, greatly improves the user experience, and effectively increases the sales volume of the electronic device.

[0073] In one embodiment, the electronic device further includes a housing and a mainboard, the mainboard includes an antenna bracket; in addition to the antenna bracket, the mainboard also includes a substrate, the antenna bracket is fixedly arranged on the substrate, and is used to fix the object. The substrate can be, for example, a plastic substrate, and the material of the antenna bracket can also be plastic. The specific materials used for the substrate and the antenna bracket are related to the electronic device, and the materials of the substrate and the antenna bracket are not limited here; the housing is used to surround the internal electronic components of the electronic device, and can be understood as the outer housing of the electronic device.

[0074] In one embodiment, the antenna device is installed inside a housing of an electronic device. Specifically, the floating branches, the first radiator and the second radiator of the antenna device are arranged on the inner shell surface of the housing or on an antenna bracket.

[0075] In one embodiment, the floating branch, the first radiator and the second radiator can be installed on any inner shell surface of the housing through metal wiring or printed circuits, or installed on the antenna bracket, so that the floating branch, the first radiator and the second radiator are on the same installation surface. Figures 2 to 4 As shown, it is an antenna model diagram in which the floating branch, the first radiator and the second radiator are arranged on the inner shell surface or the antenna bracket.

[0076] In addition to the floating branch being arranged on the mounting surface where the first radiator and the second radiator are located, in order to save wiring space, the floating branch can be installed on a different mounting surface from the two radiators, that is, the first radiator and the second radiator of the antenna device are arranged on the inner shell surface of the shell, and the floating branch of the antenna device is arranged on the antenna bracket, so that the plane where the floating branch is located is at a preset angle to the plane where the first radiating branch and the second radiating branch are located.

[0077] The inner shell surface provided with the first radiator and the second radiator is the shell surface opposite to the position of the antenna bracket. For ease of understanding, taking the electronic device as a mobile phone as an example, the shell includes a battery back cover. Since the battery back cover is opposite to the position of the antenna bracket, the first radiator and the second radiator of the antenna device are arranged on the inner side of the battery back cover of the shell. Fig.12 As shown, the antenna bracket 1201 is fixed on the substrate 1202, the floating branch 100 is fixed on the antenna bracket 1201, and the first radiator 101 and the second radiator 102 are arranged on the inner side of the battery rear cover 1203. Since the battery rear cover 1203 and the substrate 1202 are parallel surfaces, the plane where the floating branch 100 is located is perpendicular to the plane where the first radiator 101 and the second radiator 102 are located. Fig.13 ; When the battery back cover 1203 and the substrate 1202 are not parallel planes but have a certain angle, then the plane where the floating branch 100 is located and the plane where the first radiator 101 and the second radiator 102 are located are not perpendicular, but are at a certain angle. The angle is related to the angle between the plane of the battery back cover 1203 and the substrate 1202. The angle between the plane where the floating branch 100 is located and the plane where the first radiator 101 and the second radiator 102 are located is not limited here.

[0078] In one embodiment, the first radiator and the second radiator of the antenna device can also be set on the antenna bracket, and the floating branches of the antenna device can be set on the inner shell surface of the shell, so that the plane where the floating branches are located is at a preset angle with the plane where the first radiating branches and the second radiating branches are located.

[0079] By not installing the floating branch and the two radiators on the same mounting surface, the position of the floating branch can be changed. The S parameter simulation results in this case are as follows: Fig.14 As shown, from Fig.14 It can be seen that it contains two resonant points, and the isolation is around 15dB in this range, which also meets the antenna requirements. Therefore, by changing the relative position of the floating branch and the two radiators, the antenna device also has the function of reducing the isolation and widening the frequency bandwidth.

[0080] It should be understood that when the antenna device provided in the embodiment of the present application is applied to a MIMO system, the first antenna formed by the first radiator and the second antenna formed by the second radiator can operate in a time-division duplex (TDD) mode or a frequency-division duplex (FDD) mode. That is, the first antenna and the second antenna can operate in different frequency ranges. The operating frequency band of the first antenna can cover the receiving frequency band of the FDD mode, and the operating frequency band of the second antenna can cover the transmitting frequency band of the FDD. Alternatively, the first antenna and the second antenna can operate at high and low powers in the same frequency band in the FDD mode or the TDD mode. The present application does not limit the operating frequencies of the first antenna and the second antenna, and can be adjusted according to actual design or production needs.

[0081] In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic, for example, the division of the units is only a logical function division, and there may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed.

[0082] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

[0083] The professionals should further realize that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented by electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in the above description according to the function. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0084] The steps of the method or algorithm described in conjunction with the embodiments disclosed herein may be implemented using hardware, a software module executed by a processor, or a combination of the two. The software module may be placed in a random access memory (RAM), a memory, a read-only memory (ROM), an electrically programmable ROM, an electrically erasable programmable ROM, a register, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.

[0085] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An antenna device, characterized in that: The antenna device comprises: a floating branch, a first radiator and a second radiator; Wherein, a first gap is formed between the first radiator and the second radiator; The first radiator comprises a first short-circuit branch, a first feeding branch and a first radiating branch, wherein the first short-circuit branch is arranged at one end of the first radiating branch close to the first gap, and the first feeding branch is arranged beside the first short-circuit branch and away from the first gap; The second radiator comprises a second short-circuit branch, a second feeding branch and a second radiating branch, wherein the second short-circuit branch is arranged at one end of the second radiating branch close to the first gap, and the second feeding branch is arranged beside the second short-circuit branch and away from the first gap; The floating branch forms a second gap with the first radiation branch and the second radiation branch, and the first radiator and the second radiator are electromagnetically coupled with the floating branch through the second gap.

2. The antenna device according to claim 1, characterized in that The first radiator is at least one of the following: an inverted F structure, a ring structure, and a monopole-ground parasitic structure; The second radiator is at least one of the following: an inverted-F structure, a ring structure, and a monopole-ground parasitic structure.

3. The antenna device according to claim 1, characterized in that The first radiator and the second radiator are the same structure, and when the first radiator and the second radiator are symmetrical along the first gap direction, the floating branches are symmetrical along the first gap direction.

4. The antenna device according to claim 1, characterized in that: The length of the floating branch is one quarter to one half of the wavelength corresponding to the resonance point generated by the first radiator or the second radiator.

5. The antenna device according to claim 1, characterized in that: The antenna device further comprises a first feeding unit and a second feeding unit; The first short-circuit branch is grounded, the first feeding branch is connected to the first feeding unit, the second short-circuit branch is grounded, and the second feeding branch is connected to the second feeding unit.

6. The antenna device according to claim 1, characterized in that: The floating branches are in a broken line shape or a straight line shape.

7. An electronic device, characterized in that: The electronic device comprises the antenna device according to any one of claims 1 to 6.

8. The electronic device according to claim 7, characterized in that: The electronic device further comprises a housing and a mainboard, wherein the mainboard comprises an antenna bracket; The floating branches, the first radiator and the second radiator of the antenna device are arranged on the inner shell surface of the shell or on the antenna bracket.

9. The electronic device according to claim 8, characterized in that: The first radiator and the second radiator of the antenna device are arranged on the inner shell surface of the shell, and the floating branches of the antenna device are arranged on the antenna bracket, so that the plane where the floating branches are located is at a preset angle with the plane where the first radiating branches and the second radiating branches are located.

10. The electronic device according to claim 8, characterized in that: The first radiator and the second radiator of the antenna device are arranged on the antenna bracket, and the floating branches of the antenna device are arranged on the inner shell surface of the shell, so that the plane where the floating branches are located is at a preset angle with the plane where the first radiating branches and the second radiating branches are located.

Images