Antenna module, antenna system, and electronic device

Abstract

The present application provides an antenna module, an antenna system, and an electronic device. The antenna module comprises a first antenna and a second antenna. The working frequency band of the first antenna comprises a first frequency band and a second frequency band, the working frequency band of the second antenna comprises a third frequency band, the first frequency band is entirely lower than the second frequency band and the third frequency band, and the second frequency band is adjacent to or partially overlaps with or completely overlaps with the third frequency band. The length of a radiator of the first antenna is L1, and formula (I), wherein n1 is an integer greater than or equal to 1, λ1 represents the wavelength of an electromagnetic wave having a frequency of f1 in a working environment; the frequency f1 is located within a first decoupling frequency band of the antenna module, the first decoupling frequency band is f11-f12, f11 is the lowest frequency in the second frequency band and the third frequency band, and f12 is the highest frequency in the second frequency band and the third frequency band. The antenna module provided in the embodiments of the present application can achieve decoupling between adjacent co-frequency or adjacent-frequency antennas, alleviating the problem of antenna layout congestion in an electronic device.

Description

Antenna module, antenna system and electronic device

[0001] The present application claims priority from the Chinese patent application No. 202410482114.8 filed on April 19, 2024, and entitled "Antenna module, antenna system and electronic device", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0002] The present application relates to the field of communication technology, in particular to an antenna module, an antenna system and an electronic device. BACKGROUND

[0003] To realize communication with the outside world, an antenna needs to be provided in an electronic device. With the emergence of new appearances such as foldable screens and full screens, and the diversification of communication standards, the number of antennas in electronic devices has increased, and the architecture and layout of antenna systems are facing challenges.

[0004] For a vertically folding foldable electronic device, the upper half region and the lower half region can be relatively unfolded or relatively folded through a hinge region. Since the processor and the radio frequency chip for feeding the antenna are usually arranged in the upper half region, if the antenna is arranged in the lower half region, the connection line (for example, FPC) between the antenna in the lower half region and the radio frequency chip in the upper half region needs to pass through the hinge region, which will result in a longer connection line and greater loss, and the connection line passing through the hinge region will limit the structure of the hinge region. Therefore, the antenna needs to be arranged in the upper half region as much as possible.

[0005] However, the space in the upper half region of the foldable electronic device is limited, and in the architecture of a large metal back cover or a secondary screen full screen, it is difficult to arrange the antenna in the back cover region, and only multiple antennas can be concentrated in the frame of the upper half region, which makes the layout more cramped, resulting in a short distance between the antennas and signal coupling, which reduces the communication quality. When the two adjacent antennas are frequency offset antennas (which can be understood as having a large difference in operating frequency band, reaching a certain standard), the two antennas can be decoupled through a filter circuit. However, when the two adjacent antennas are same frequency antennas (same frequency band) or adjacent frequency antennas (small difference in frequency band), the filter circuit cannot filter out the signal of one of the antennas alone, and thus the two antennas cannot be decoupled. Therefore, in a system with multiple same frequency or adjacent frequency antennas such as MIMO (Multiple-Input Multiple-Output) antennas, there is still a serious coupling problem between the antennas.

[0006] It can be seen that in the prior art, the layout of the antenna in the electronic device is tight, and the adjacent same frequency antennas or adjacent frequency antennas are severely coupled. SUMMARY

[0007] The antenna module, the antenna system and the electronic device provided by the embodiments of the present application solve the problem of serious coupling between adjacent same-frequency antennas or adjacent-frequency antennas in the prior art.

[0008] The embodiments of the present application provide an antenna module, comprising a first antenna and a second antenna, each of the first antenna and the second antenna comprising a radiator, and a feed point and a grounding point arranged on the radiator in a spaced manner, the radiator being grounded through the corresponding grounding point and transmitting a radio frequency signal through the corresponding feed point.

[0009] The first end of the radiator of the first antenna is arranged in a spaced manner facing and close to the first end of the radiator of the second antenna, and the second end of the radiator of the first antenna is arranged in a spaced manner away from the second end of the radiator of the second antenna; in the first antenna and the second antenna, the grounding point of each antenna is located at the second end of the corresponding radiator, and the feed point of each antenna is located at the first end of the corresponding radiator or between the first end and the second end of the corresponding radiator.

[0010] The working frequency band of the first antenna comprises a first frequency band and a second frequency band, the working frequency band of the second antenna comprises a third frequency band, the first frequency band is lower than the second frequency band and the third frequency band as a whole, and the second frequency band is adjacent to or partially overlaps or completely overlaps with the third frequency band.

[0011] The length of the radiator of the first antenna is L1, n1 is an integer greater than or equal to 1, λ1 is the wavelength of an electromagnetic wave with a frequency f1 in a working environment, the frequency f1 is located in a first decoupling frequency band of the antenna module, the first decoupling frequency band is f 11 ~ f 12 , f 11 is the lowest frequency in the second frequency band and the third frequency band, and f 12 is the highest frequency in the second frequency band and the third frequency band.

[0012] The antenna module provided by the embodiments of the present application is provided with the grounding point and the feed point on the radiators of the first antenna and the second antenna, and can realize signal transmission and reception. The grounding points of the two antennas are located at the second ends of the respective radiators, and the feed points are located at the first ends of the respective radiators or between the first ends and the second ends of the respective radiators, that is, the feed points can be arranged at any place on the radiators of the respective antennas except the grounding points. The first ends of the two antennas are arranged in a spaced manner facing and close to each other, which can be understood as an arrangement in a "mouth-to-mouth" manner, so that the feed points of the two antennas are opposite to each other.

[0013] The second frequency band of the first antenna is adjacent to, partially overlaps, or completely overlaps the third frequency band of the second antenna. Adjacent can be understood as the frequency bands of the second frequency band and the third frequency band being close but not overlapping, for example, adjacent frequency; partially overlapping means that a part of the second frequency band and the third frequency band overlap, for example, adjacent frequency; and completely overlapping means that the second frequency band and the third frequency band are completely the same, for example, same frequency. That is, the first antenna and the second antenna are same frequency antennas or adjacent frequency antennas. The first decoupling frequency band f 11 12 represents the frequency range from the lowest frequency to the highest frequency among the second frequency band and the third frequency band, that is, the shortest frequency band range that can cover the second frequency band and the third frequency band. The frequency f1 can be a frequency at any point between f 11 and f 12 , and λ1 is the wavelength corresponding to the frequency f1.

[0014] The length L1 of the radiator of the first antenna is set as: n1 is an integer greater than or equal to 1, which can be changed by selecting f1, and the length L1 of the radiator of the first antenna can be adjusted by adjusting λ1 and n1, so that the first antenna works in 1λ1、 1λ1、 1λ1、 1λ1, and the electromagnetic wave around the radiator of the first antenna is distributed in the form of one cosine wave period, one cosine wave period, one cosine wave period, and so on. At this time, the electric field of the first antenna is limited around the radiator, and the electric field at both ends of the radiator is weak, thereby weakening the coupling degree of the two antennas. Moreover, a decoupling pit is generated at the position of the frequency f1, which is specifically manifested as that the S21 curve (the S21 parameter can represent the isolation degree of the antenna, and the smaller the S21 parameter is, the higher the isolation degree of the second frequency band and the third frequency band is, and the better the decoupling effect is) in the antenna efficiency diagram produces a trough at the frequency point f1, and the S21 curve in a frequency range on both sides of the frequency point f1 is also pulled down by the decoupling pit, so that the isolation degree in the frequency range around f1 is improved. Since f1 is located in the first decoupling frequency band, the first decoupling frequency band covers the second frequency band and the third frequency band, so the isolation degree of the second frequency band and the third frequency band is improved, and same frequency decoupling or adjacent frequency decoupling of the first antenna and the second antenna is achieved. In a compact electronic device, even if the first antenna and the second antenna are arranged close to each other, the isolation degree of the two antennas is high, and the signal coupling of the two antennas does not affect the communication quality of the electronic device,

[0015] Therefore, the antenna module provided in the embodiments of the present application can realize decoupling between adjacent same frequency antennas or adjacent frequency antennas, and relieve the problem of tight layout of antennas in an electronic device.

[0016] In some embodiments, the operating frequency band of the first antenna further includes a fourth frequency band, and the operating frequency band of the second antenna further includes a fifth frequency band, the first frequency band is lower than the fourth frequency band and the fifth frequency band as a whole, and the fourth frequency band and the fifth frequency band are adjacent or partially overlap or completely overlap. And,

[0017] n2 is an integer greater than or equal to 1 and different from n1, and λ2 is: the wavelength of an electromagnetic wave with a frequency f2 in the working environment, the frequency f2 is within a second decoupling frequency band of the antenna module, the second decoupling frequency band is f 21 ~ f 22 , f 21 is the lowest frequency in the fourth frequency band and the fifth frequency band, and f 22 is the highest frequency in the fourth frequency band and the fifth frequency band; the second decoupling frequency band does not overlap with the first decoupling frequency band.

[0018] By the above scheme, λ2 is changed by the selection of f2, and the length L1 of the radiator of the first antenna is adjusted by adjusting λ2 and n2, so that the first antenna works in 1λ2、 and other multiple frequency difference modes, the isolation of the fourth frequency band and the fifth frequency band is improved, thereby realizing the decoupling of multiple decoupling frequency bands of the antenna module.

[0019] In some embodiments, the antenna module further includes a first capacitor, and the first antenna further includes a first capacitor connection point, the first capacitor connection point is arranged at the middle part of the radiator of the first antenna and between the ground point and the feed point of the first antenna, one end of the first capacitor is connected to the first capacitor connection point, and the other end is grounded.

[0020] By the above scheme, the first capacitor can move the position of the decoupling pit, widen the decoupling bandwidth of the first decoupling frequency band, and further improve the decoupling effect of the first antenna and the second antenna.

[0021] In some embodiments, the first capacitor connection point is arranged at the midpoint of the radiator of the first antenna. And / or, the first capacitor is a lumped capacitor or a distributed capacitor.

[0022] In some embodiments, when the feed point of the first antenna is located between the first end and the second end of the radiator of the first antenna, the feed point of the first antenna is located between the first end and the midpoint of the radiator of the first antenna.

[0023] In some embodiments, λ 01 / 8≤L1≤λ 01 / 4, wherein λ 01 is the wavelength corresponding to any frequency in a first reference frequency band, the lowest frequency of the first reference frequency band is lower than the lowest frequency of the first frequency band by a first preset threshold, and the highest frequency of the first reference frequency band is higher than the highest frequency of the first frequency band by a second preset threshold.

[0024] λ 02 / 8≤L2≤λ 02 / 4, where L2 is a length of the radiator of the second antenna, λ 02 is a wavelength corresponding to any frequency in a second reference frequency band, a lowest frequency of the second reference frequency band being lower than a lowest frequency of a lowest operating frequency band in the second antenna by a third preset threshold, and a highest frequency of the second reference frequency band being higher than a highest frequency of the lowest operating frequency band in the second antenna by a fourth preset threshold.

[0025] In some embodiments, a gap between the first end of the radiator of the first antenna and the first end of the radiator of the second antenna is s, 1mm≤s≤3mm.

[0026] In some embodiments, each of the radiator of the first antenna and the radiator of the second antenna is a branch or a slot.

[0027] In some embodiments, the first frequency band ranges from 0.7GHz to 0.96GHz, and

[0028] The second frequency band ranges from 2.3GHz to 2.4GHz or 2.5GHz to 2.7GHz or 2.4GHz to 2.48GHz, and the third frequency band ranges from 2.4GHz to 2.48GHz.

[0029] Alternatively, the second frequency band ranges from 4.4GHz to 5.0GHz, and the third frequency band ranges from 5.17GHz to 5.835GHz.

[0030] With the above scheme, common frequency bands in electronic devices such as mobile phones are basically covered.

[0031] In some embodiments, when the operating frequency band of the first antenna includes a fourth frequency band, the operating frequency band of the second antenna includes a fifth frequency band, the second frequency band ranges from 2.3GHz to 2.4GHz or 2.5GHz to 2.7GHz or 2.4GHz to 2.48GHz, and the third frequency band ranges from 2.4GHz to 2.48GHz, the fourth frequency band ranges from 4.4GHz to 5.0GHz, and the fifth frequency band ranges from 5.17GHz to 5.835GHz,

[0032] when the operating frequency band of the first antenna comprises a fourth frequency band, the operating frequency band of the second antenna comprises a fifth frequency band, the second frequency band ranges from 4.4 GHz to 5.0 GHz, and the third frequency band ranges from 5.17 GHz to 5.835 GHz, the fourth frequency band ranges from 2.3 GHz to 2.4 GHz or from 2.5 GHz to 2.7 GHz or from 2.4 GHz to 2.48 GHz, and the fifth frequency band ranges from 2.4 GHz to 2.48 GHz,

[0033] In some embodiments, the center frequency of the second frequency band is f 1mid , and the center frequency of the third frequency band is f 2mid ,

[0034] when the operating frequency band of the first antenna comprises a fourth frequency band, the operating frequency band of the second antenna comprises a fifth frequency band, the center frequency of the fourth frequency band is f 4mid , and the center frequency of the fifth frequency band is f 5mid ,

[0035] By using the above scheme, the second frequency band and the second frequency band are adjacent frequency bands or the same frequency band.

[0036] The embodiments of the present application also provide an antenna system, which comprises a first radio frequency module, a second radio frequency module, and the antenna module provided in any of the above embodiments, the first radio frequency module being configured to transmit a radio frequency signal to the feed point of the first antenna, and the second radio frequency module being configured to transmit a radio frequency signal to the feed point of the second antenna.

[0037] The antenna system provided by the embodiments of the present application can realize decoupling of the adjacent frequency antenna and the same frequency antenna, and has high system efficiency.

[0038] In some embodiments, the antenna system further comprises a second capacitor, one end of the second capacitor being connected to a circuit between the feed point of the first antenna and the plurality of first radio frequency modules, and the other end being grounded.

[0039] By using the above scheme, the isolation curve of the two antennas can be pulled down by the second capacitor, and the decoupling bandwidth is widened.

[0040] In some embodiments, when the second frequency band is adjacent to the third frequency band, the antenna system further comprises a first filter circuit; wherein the frequency f1 is located in the second frequency band of the first antenna, one end of the first filter circuit is connected to a circuit between the feed point of the first antenna and the first radio frequency module, and the other end is grounded, so as to filter out signals under the third frequency band of the second antenna. Alternatively, the frequency f1 is located in the third frequency band of the second antenna, one end of the first filter circuit is connected to a circuit between the feed point of the second antenna and the second radio frequency module, and the other end is grounded, so as to filter out signals under the second frequency band of the first antenna.

[0041] By using the above scheme, the second antenna can filter out the interference signal of the first antenna, or the first antenna can filter out the interference signal of the second antenna, so as to improve the isolation between the first antenna and the second antenna.

[0042] In some embodiments, when the operating frequency band of the first antenna further includes a fourth frequency band, the operating frequency band of the second antenna further includes a fifth frequency band, and the fourth frequency band and the fifth frequency band are adjacent, the antenna system further includes a second filter circuit. When the frequency f2 is located in the fourth frequency band of the first antenna, one end of the second filter circuit is connected to the circuit between the feed point of the first antenna and the first radio frequency module, and the other end is grounded, so as to filter out the signal in the fifth frequency band of the second antenna; or when the frequency f2 is located in the fifth frequency band of the second antenna, one end of the second filter circuit is connected to the circuit between the feed point of the second antenna and the second radio frequency module, and the other end is grounded, so as to filter out the signal in the fourth frequency band of the first antenna.

[0043] By using the above scheme, the second antenna can filter out the interference signal of the first antenna, or the first antenna can filter out the interference signal of the second antenna, so as to improve the isolation between the first antenna and the second antenna.

[0044] In some embodiments, when the antenna system includes the first filter circuit, the first filter circuit includes a third capacitor and a first inductor connected in series; wherein the series resonance frequency of the series resonance circuit formed by the third capacitor and the first inductor is located in the third frequency band of the second antenna, so as to filter out the signal in the third frequency band of the second antenna, or the series resonance frequency of the series resonance circuit formed by the third capacitor and the first inductor is located in the second frequency band of the first antenna, so as to filter out the signal in the second frequency band of the first antenna.

[0045] When the operating frequency band of the first antenna further includes a fourth frequency band, the operating frequency band of the second antenna further includes a fifth frequency band, and the antenna system includes a second filter circuit, the second filter circuit includes a fourth capacitor and a second inductor connected in series; wherein the series resonance frequency of the series resonance circuit formed by the fourth capacitor and the second inductor is located in the fifth frequency band of the second antenna, so as to filter out the signal in the fifth frequency band of the second antenna, or the series resonance frequency of the series resonance circuit formed by the fourth capacitor and the second inductor is located in the fourth frequency band of the first antenna, so as to filter out the signal in the fourth frequency band of the first antenna.

[0046] In some embodiments, the antenna system further includes:

[0047] The first impedance matching circuit is arranged on the circuit between the first radio frequency module and the feed point of the first antenna.

[0048] By adopting the scheme, different working modes of the first antenna can be excited by adjusting the first impedance matching circuit, and the radiation performance of the first antenna can be optimized.

[0049] In some embodiments, the first impedance matching circuit includes a fifth capacitor, a sixth capacitor and a third inductor, the fifth capacitor and the third inductor are connected in series between the first radio frequency module and the feed point of the first antenna, one end of the sixth capacitor is connected between the third inductor and the first radio frequency module, and the other end is grounded.

[0050] The electronic device provided in the embodiments of the present application can realize the decoupling of the same-frequency antenna or the adjacent-frequency antenna in the case of compact antenna layout, which is beneficial to improving the communication quality of the electronic device.

[0051] The electronic device provided in the embodiments of the present application can realize the decoupling of the same-frequency antenna or the adjacent-frequency antenna in the case of compact antenna layout, which is beneficial to improving the communication quality of the electronic device.

[0052] In some embodiments, the electronic device is a foldable electronic device, including a first display screen, a second display screen and a housing assembly, the housing assembly includes a first housing, a second housing and a hinge device, the first housing and the second housing are rotationally connected through the hinge device.

[0053] The first display screen is arranged on one side of the housing assembly and includes a first part, a second part and a foldable part, the first part is fixedly connected to the first housing, the second part is fixedly connected to the second housing, and the foldable part is arranged corresponding to the hinge device; the second display screen is fixedly connected to the first housing and is arranged opposite to the first part of the first display screen in the thickness direction of the first housing.

[0054] The radiators of the first antenna and the second antenna are formed by the outer frame of the first housing.

[0055] Alternatively, the radiators of the first antenna and the second antenna adopt a patch structure, and the patch structure is attached to the surface of the outer frame of the first housing.

[0056] By adopting the scheme, the first antenna and the second antenna are both arranged on the outer frame of the first housing of the electronic device, which is beneficial to reducing the line insertion loss between the antenna and the radio frequency module.

[0057] In some embodiments, the electronic device further includes a ground plate, the ground plate is arranged spaced apart from the radiators of the first antenna and the second antenna, and the radiator of each of the first antenna and the second antenna is connected to the ground plate through a corresponding grounding point to be grounded.

[0058] In some embodiments, the electronic device further includes a circuit board, and the circuit board is mounted in the first housing.

[0059] The first radio frequency module and the second radio frequency module of the antenna system are arranged on the circuit board.

[0060] In some embodiments, the radiator of the first antenna and the radiator of the second antenna are located on the same side of the first housing. BRIEF DESCRIPTION OF DRAWINGS

[0061] FIG. 1 is a structural schematic diagram of a first electronic device;

[0062] FIG. 2 is a structural schematic diagram of a second electronic device;

[0063] FIG. 3 is a structural schematic diagram of an antenna module;

[0064] FIG. 4a is a structural schematic diagram of an electronic device in an unfolded state according to an embodiment of the present application;

[0065] FIG. 4b is a structural schematic diagram of an electronic device in a folded state according to an embodiment of the present application;

[0066] FIGS. 5a-5d are layout schematic diagrams of antennas in an electronic device according to an embodiment of the present application;

[0067] FIG. 6 is a structural schematic diagram of an antenna module according to an embodiment of the present application;

[0068] FIG. 7 is a structural schematic diagram of a first implementation of an antenna system according to an embodiment of the present application;

[0069] FIG. 8 is a structural schematic diagram of a second implementation of an antenna system according to an embodiment of the present application;

[0070] FIG. 9a is a circuit diagram of a first impedance matching circuit in an antenna system according to an embodiment of the present application;

[0071] FIG. 9b is a circuit diagram of a second impedance matching circuit in an antenna system according to an embodiment of the present application;

[0072] FIG. 10a is a structural schematic diagram of a first implementation of a filter circuit in an antenna system according to an embodiment of the present application;

[0073] FIG. 10b is a structural schematic diagram of a second implementation of a filter circuit in an antenna system according to an embodiment of the present application;

[0074] FIG. 10c is a circuit diagram of a first filter circuit in an antenna system according to an embodiment of the present application;

[0075] FIG. 11a is a structural schematic diagram of a third implementation of a filter circuit in an antenna system according to an embodiment of the present application;

[0076] FIG. 11b is a structural schematic diagram of a fourth implementation of a filter circuit in an antenna system according to an embodiment of the present application;

[0077] FIG. 11c is a circuit diagram of a second filter circuit in an antenna system according to an embodiment of the present application;

[0078] Figure 12a is a schematic diagram of a fifth embodiment of a filter circuit in an antenna system according to an embodiment of the application;

[0079] Figure 12b is a schematic diagram of a sixth embodiment of a filter circuit in an antenna system according to an embodiment of the application;

[0080] Figure 12c is a schematic diagram of a seventh embodiment of a filter circuit in an antenna system according to an embodiment of the application;

[0081] Figure 12d is a schematic diagram of an eighth embodiment of a filter circuit in an antenna system according to an embodiment of the application;

[0082] Figure 13a is a diagram of the relationship between the frequency bands in an antenna module according to an embodiment of the application;

[0083] Figure 13b is a diagram of the relationship between the frequency bands in an antenna module according to an embodiment of the application;

[0084] Figure 14 is a diagram of the electromagnetic wave distribution in an antenna module according to an embodiment of the application;

[0085] Figure 15 is a diagram of the electric field simulation in an antenna module according to an embodiment of the application;

[0086] Figure 16 is a diagram of the different operating modes of a first antenna in an antenna module according to an embodiment of the application;

[0087] Figure 17 is a circuit diagram of a first embodiment of an antenna module according to an embodiment of the application;

[0088] Figure 18 is a diagram of the electromagnetic wave distribution in a first embodiment of an antenna module according to an embodiment of the application;

[0089] Figure 19 is a diagram of the response curves of the antennas in a first embodiment of an antenna module according to an embodiment of the application;

[0090] Figure 20 is a diagram of the response curves of the antennas in a second embodiment of an antenna module according to an embodiment of the application;

[0091] Figure 21a is a diagram of the electromagnetic wave distribution in a third embodiment of an antenna module according to an embodiment of the application;

[0092] Figure 21b is a diagram of the response curves of the antennas in a third embodiment of an antenna module according to an embodiment of the application;

[0093] Figure 22a is a diagram of the electromagnetic wave distribution in a fourth embodiment of an antenna module according to an embodiment of the application;

[0094] Figure 22b is a diagram of the response curves of the antennas in a fourth embodiment of an antenna module according to an embodiment of the application;

[0095] Figure 23a is a diagram of the electromagnetic wave distribution in a fifth embodiment of an antenna module according to an embodiment of the application;

[0096] Figure 23b is a graph of the response curves of the antennas in the fifth embodiment of the antenna module of the present application;

[0097] Figure 24a is a graph of the electromagnetic wave distribution of the sixth embodiment of the antenna module of the present application;

[0098] Figure 24b is a graph of the response curves of the antennas in the sixth embodiment of the antenna module of the present application;

[0099] Figure 25a is a graph of the electromagnetic wave distribution of the seventh embodiment of the antenna module of the present application;

[0100] Figure 25b is a circuit diagram of the seventh embodiment of the antenna module of the present application;

[0101] Figures 25c-25d are schematic diagrams of the structure of the first capacitor in the antenna module of the present application;

[0102] Figure 25e is a graph of the response curves of the antennas in the seventh embodiment of the antenna module of the present application.

[0103] Explanation of reference signs: First electronic device: 100', electronic device; 11', housing; 12', sub-screen; 13', pivot area; 141', upper half area; 142', lower half area; 15', circuit board; 16', camera module; 17', antenna; 18', shaft-penetrating FPC. Second electronic device: 200', electronic device; 21', bezel; 22', circuit board; 23', first radio frequency chip; 24', second radio frequency chip; 25', camera module; 261', first antenna; 262', second antenna; 263', third antenna; 264', fourth antenna. An antenna module: 300', antenna module; 31', first antenna; 31', radiator; 312', ground point; 313', feed point; 314', feed source; 32', second antenna; 321', radiator; 322', ground point; 323', feed point; 324', feed source; 33', filter circuit; 331', capacitor; 332', inductor; 34', filter circuit. The present application: 100, electronic device; 11, first display screen; 111, first part; 112, second part; 113, foldable part; 12, second display screen; 2, housing assembly; 21, first housing; 211, bottom plate; 212, outer bezel; 2121, first bezel; 2122, second bezel; 2123, third bezel; 22, second housing; 23, pivot mechanism; 31, camera module; 311, lens; 32, circuit board; 33, ground plate; 34, antenna; 200, antenna module; 4, first antenna; 41, radiator; 410, midpoint; 411, first end; 412, second end; 42, feed point; 43, ground point; 44, first capacitor connection point; 45, first capacitor; 5, second antenna; 51, radiator; 510, midpoint; 511, first end; 512, second end; 52, feed point; 53, ground point; 300, antenna system; 61, first radio frequency module; 62, second radio frequency module; 71, first impedance matching circuit; 711, fifth capacitor; 712, sixth capacitor; 713, third inductor; 72, second impedance matching circuit; 721, seventh capacitor; 722, eighth capacitor; 723, fourth inductor; 81, first filter circuit; 811, third capacitor; 812, first inductor; 82, second filter circuit; 821, fourth capacitor; 822, second inductor; 91, second capacitor; X, length direction of the electronic device; Y, width direction of the electronic device; Z, thickness direction of the first housing. DETAILED DESCRIPTION

[0104] The specific embodiments of the present application will now be described with reference to the drawings. The following description of the embodiments of the present application is merely illustrative in nature and is in no way intended to limit the application, its application or its uses. Although the description of the application will focus on some embodiments, all alternatives and modifications that can be made to the embodiments by those skilled in the art are within the scope of the present application. In order to provide a thorough understanding of the present application, numerous specific details are described in the following description. The present application can be practiced without these specific details. In addition, well-known methods, structures, and techniques have been omitted in order to avoid obscuring the present application. In addition, some terminology can be used in the description for the sake of brevity.

[0105] It should be noted that in the description of the present application, similar reference numerals and letters in the drawings represent similar items, and thus, once an item is defined in one drawing, it need not be further defined and explained in subsequent drawings.

[0106] The following explains the terms that may appear in the embodiments of the present application.

[0107] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus cannot be understood as limiting the present application. In addition, the terms "first" and "second" are only for the purpose of description and cannot be understood as indicating or implying relative importance.

[0108] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication between the two elements inside. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0109] Coupling: can be understood as direct coupling and / or indirect coupling, and "coupling connection" can be understood as direct coupling connection and / or indirect coupling connection. Direct coupling can also be referred to as "electrical connection", which is understood as physical contact and electrical conduction of components; it can also be understood as a form of connection between different components in a circuit structure through a physical line that can transmit electrical signals such as copper foil or wire on a printed circuit board (PCB); "indirect coupling" can be understood as electrical conduction between two conductors through a space without contact. In an embodiment, indirect coupling can also be referred to as capacitive coupling, for example, through the coupling between the gap between two conductive parts to form an equivalent capacitor to achieve signal transmission.

[0110] End: "end" in the first end / second end / feed end / ground end of the antenna radiator, which cannot be understood as a point in a narrow sense, but can also be considered as a section of the radiator including the end point on the antenna radiator; it also cannot be understood as a point or end that is disconnected from other radiators in a narrow sense, but can also be considered as a point or section on a continuous radiator. In an embodiment, the "end" can include the end point of the antenna radiator at a certain gap, for example, the end of the antenna radiator can be considered as a section of the radiator within 5mm (for example, 2mm) from a certain gap. In an embodiment, the "end" can include the connection point of the antenna radiator connected to other conductive structures, for example, the feed end can be the connection point of the antenna radiator coupled to the feed structure, and the ground end can be the connection point of the antenna radiator coupled to the ground structure.

[0111] Open end, closed end: In some embodiments, the open end / closed end is relative to whether it is grounded, for example, the closed end is grounded and the open end is not grounded. In some embodiments, the open end / closed end is relative to other conductive bodies, for example, the closed end is electrically connected to other conductive bodies and the open end is not electrically connected to other conductive bodies. In an embodiment, the open end can also be referred to as an open end or an open circuit end. In an embodiment, the closed end can also be referred to as a ground end or a short circuit end.

[0112] Opposite arrangement: can be understood as opposite arrangement or arrangement with at least partial area overlap in a certain direction.

[0113] Ground / Ground Plane: Refers to at least a portion of any ground layer, or ground plane, or ground metal layer, or any combination of the above, within an electronic device (such as a mobile phone), which can be used for grounding of components within the electronic device. In one embodiment, the "ground / ground plane" can include any one or more of the following: a ground layer of a circuit board of the electronic device, a ground plane formed by a housing of the electronic device, a conductive ground layer of a battery, and a conductive or metallic member in electrical connection with the above ground layer / ground plane / metal layer. In one embodiment, the circuit board can include a printed circuit board (PCB), such as an 8-layer, 10-layer, or 12- to 14-layer board having 8, 10, 12, 13, or 14 layers of conductive material, or elements separated and electrically isolated by a dielectric or insulating layer such as fiberglass, polymer, etc. In one embodiment, the PCB board includes a dielectric substrate, a ground layer, and a trace layer, which are electrically connected by vias. The dielectric substrate in the PCB board can be a FR-4 dielectric board, a Rogers dielectric board, or a hybrid Rogers and FR-4 dielectric board. In one embodiment, components such as a processor, a memory, a battery, a charging circuit, a system on chip (SoC) structure, etc. can be mounted on or connected to the circuit board; or electrically connected to the trace layer and / or the ground layer in the circuit board. For example, a radio frequency source can be disposed on the trace layer.

[0114] The above ground layer, or ground plane, or ground metal layer can be made of a conductive material. In one embodiment, the conductive material can be any one of the following: copper, aluminum, stainless steel, brass, and alloys thereof, copper foil on an insulating substrate, aluminum foil on an insulating substrate, gold foil on an insulating substrate, silver-coated copper, silver-coated copper foil on an insulating substrate, silver foil on an insulating substrate, and tin-coated copper, graphite-impregnated cloth, graphite-coated substrate, copper-coated substrate, brass-coated substrate, and aluminum-coated substrate. Those skilled in the art will appreciate that the ground layer / ground plane / ground metal layer can also be made of other conductive materials.

[0115] In embodiments of the present application, the wavelength in a certain wavelength mode (such as a half-wavelength mode, etc.) of an antenna can refer to the wavelength of a signal radiated by the antenna. It should be understood that the wavelength of a radiated signal in air can be calculated as follows: air wavelength (or vacuum wavelength) = speed of light / frequency, where the frequency is the frequency of the radiated signal, and the speed of light can be taken as 3 x 10 8 The wavelength of a radiated signal in a medium can be calculated as follows: Wherein, ε is the relative dielectric constant of the medium, and f is the frequency of the radiated signal. The slots, grooves in the following embodiments can be filled with insulating medium.

[0116] Antenna radiation efficiency: refers to the ratio of the power radiated by the antenna into space (i.e. the power effectively converted into electromagnetic waves) and the active power input to the antenna. Wherein, the active power input to the antenna = input power of the antenna - loss power; the loss power mainly includes the return loss power and the ohmic loss power of the metal and / or the dielectric loss power.

[0117] Antenna system efficiency: refers to the ratio of the power radiated by the antenna into space (i.e. the power effectively converted into electromagnetic waves) and the input power of the antenna.

[0118] Relative bandwidth: the relative bandwidth is defined as the ratio of the signal bandwidth to the center frequency, which can be used to measure the quality and performance of the signal.

[0119] The parallel, perpendicular, same (e.g. same length, same width, etc.) and the like mentioned in the embodiments of the present application are all for the current process level, and are not strictly defined in the mathematical sense. There can be a deviation within a predetermined angle range between two radiators that are parallel or perpendicular to each other. In an embodiment, the predetermined angle is 10°, for example, the deviation can be within ±5°.

[0120] To make the purpose, technical solutions and advantages of the present application clearer, the embodiments of the present application will be further described in detail below with reference to the drawings.

[0121] In order to realize communication with the outside world, an antenna needs to be provided in the electronic device. With the emergence of new appearances such as folding screens and full screens, the diversification of communication systems and the increase in the number of antennas, the architecture and layout of the antenna system in the electronic device are facing challenges.

[0122] Please refer to FIG. 1, which is a structural schematic diagram of a first electronic device.

[0123] As shown in FIG. 1, the electronic device 100' is a vertically folding foldable electronic device that can be folded vertically (i.e., folded along the up-down direction of FIG. 1). The electronic device 100' includes a housing 11', a main screen (not shown in the figure) and a secondary screen 12'. It can be understood that the housing 11' is provided with a rotating shaft mechanism, and the area where the rotating shaft mechanism is located is a rotating shaft area 13'. The electronic device 100' is divided into an upper half area 141' and a lower half area 142' by the rotating shaft area 13'. The main screen is provided on the front of the electronic device 100' and covers the entire housing 11', and the secondary screen 12' is provided on the back of the housing 11' and located in the upper half area 141' of the electronic device 100'. Generally, in order to improve the integration of the circuit in the electronic device 100', the circuit board 15', the camera module 16', the processor (not shown in the figure) and the radio frequency chip (not shown in the figure) for feeding the antenna are also arranged in the upper half area 141', therefore, the layout of the upper half area 141' of the electronic device 100' is relatively tight.

[0124] The electronic device 100' is provided with a plurality of antennas 17'. The antennas 17' can be located on the metal frame of the housing 11', or can be arranged on the circuit board 15' in the form of FPC (Flexible Printed Circuit) antenna, LDS (Laser-Direct-Structuring) antenna, etc. However, when the back cover of the housing 11' is made of a large area of metal material, it will block the antenna signal on the circuit board 15'. On the other hand, in order to improve the screen ratio of the electronic device 100', the size of the secondary screen 12' is designed to be larger in some products, and some metal elements in the secondary screen 12' will also block the antenna signal on the circuit board 15'. Moreover, in the case of a large size of the secondary screen 12', the size of the back cover of the upper half area 141' of the electronic device is small, and it is also difficult to arrange the antenna on the back cover area of the electronic device 100', for example, between the back cover and the circuit board 15', or directly process the antenna on the back cover, etc. Therefore, some products arrange all the antennas 17' on the frame to ensure that the antennas 17' can normally receive and transmit signals.

[0125] As shown in FIG. 1, there are a large number of antennas 17' in the electronic device 100'. If all the antennas 17' are concentrated on the frame of the upper half region 141', the distance between the antennas 17' will be short, and the adjacent antennas 17' will have serious signal coupling, which will reduce the communication quality. Therefore, a part of the antennas 17' are arranged in the upper half region 141', and a part of the antennas 17' are arranged in the lower half region 142', so as to ensure that a reasonable distance can be reserved between the antennas 17'. However, the antennas 17' need to be connected with the radio frequency chip (not shown in the figure) on the circuit board 15'. The antennas 17' in the upper half region 141' are close to the radio frequency chip for feeding, the wiring is short, and the transmission loss is also small. However, the antennas 17' in the lower half region 142' are far away from the radio frequency chip for feeding, and need to be electrically connected through the shaft FPC 18'. The shaft FPC 18' passes through the shaft region 13', and one end is connected to the radio frequency chip of the circuit board 15', and the other end is connected to the antennas 17' in the lower half region 142'. It can be seen that the line of the shaft FPC 18' is long, which also means more transmission loss, and reduces the efficiency of the antenna system.

[0126] Please refer to FIG. 2, which is a structural schematic diagram of a second electronic device.

[0127] As shown in FIG. 2, unlike the electronic device 100' in FIG. 1, the electronic device 200' shown in FIG. 2 concentrates all the antennas in the upper half region. To solve the problem of close distance between antennas, part of the antennas are arranged on the frame 21', and part of the antennas are arranged on the circuit board 22', so as to avoid too much concentration of antennas. However, the antennas arranged on the circuit board 22' are easily blocked by metal components, and the layout position on the circuit board 22' is limited. Taking MIMO (Multiple-Input Multiple-Output) antennas as an example, MIMO antennas usually have multiple same-frequency antennas arranged in the form of 2x2 or 4x4. For example, in FIG. 2, the MIMO antennas are in the form of 2x2, and there are four same-frequency antennas in total. Among them, the first antenna 261', the second antenna 262' and the third antenna 263' are arranged on the frame 21', and the fourth antenna 264' is arranged on the circuit board 22', and each two antennas share one radio frequency chip. Specifically, the first antenna 261' and the second antenna 262' are close to each other and share the first radio frequency chip 23', and the third antenna 263' shares the second radio frequency chip 24' with the fourth antenna 264'. Understandably, the closer the distance between the third antenna 263' and the fourth antenna 264' is, the smaller the line loss between them is. However, the camera module 25' in the electronic device is usually arranged at the upper left corner of the upper half region, which is close to the third antenna 263'. However, the camera module 25' has occupied the wiring resources on the circuit board 22', and the fourth antenna 264' cannot be arranged at this position, but can only be placed at the upper right corner area far away from the third antenna 263', so there is still a large wiring insertion loss between the third antenna 263' and the fourth antenna 264'.

[0128] In combination with the above two schemes, if you want to reduce the line insertion loss of the antenna system, you can only design the antennas to be close to each other, and the problem of decoupling between antennas needs to be solved urgently. The following describes a conventional scheme for antenna decoupling in the prior art.

[0129] For the convenience of the following description, first, the same-frequency antennas, the adjacent-frequency antennas and the offset-frequency antennas are distinguished here: when the working frequency bands of two antennas are quite different, they are offset-frequency antennas, at this time, the working frequency bands of the two antennas are completely offset. When the working frequency bands of two antennas are quite similar, they are adjacent-frequency antennas, at this time, the working frequency bands of the two antennas partially overlap (including the case of only one point coinciding), or are offset from each other but the offset distance is small. When the working frequency bands of two antennas are exactly the same, they are same-frequency antennas. In an example scenario, the center frequencies of the working frequency bands of two antennas are taken, if the ratio of the center frequencies of the two antennas is in the range of 0.83-1.2, they are adjacent-frequency antennas, and if the ratio of the center frequencies of the two antennas is less than 0.83 or greater than 1.2, they are offset-frequency antennas. For example:

[0130] The frequency range of the GPS (Global Positioning System) antenna is 1.2276GHz-1.5754GHz, and the center frequency 1.4GHz is taken. The frequency range of the N78 antenna is 3.3GHz-3.8GHz, and the center frequency 3.55GHz is taken. 3.55GHz / 1.4GHz=2.52, which is out of the range of 0.83-1.2, so the GPS antenna and the N78 antenna are misfrequency antennas;

[0131] The frequency range of the N79 antenna is 4.4GHz-5GHz, and the center frequency 4.7GHz is taken. The frequency range of the 5G WIFI (WIreless Fidelity) antenna is 5.17GHz-5.835GHz, and the center frequency 5.5GHz is taken. 5.5GHz / 4.7GHz=1.17, which is in the range of 0.83-1.2, so the N79 antenna and the 5G WIFI antenna are adjacent frequency antennas;

[0132] The frequency range of the B40 antenna is 2.3GHz-2.4GHz, and the center frequency 2.35GHz is taken. The frequency range of the 2.4G WIFI antenna is 2.4GHz-2.48GHz, and the center frequency 2.44GHz is taken. 2.44GHz / 2.35GHz=1.038, which is in the range of 0.83-1.2, so the B40 antenna and the 2.4G WIFI antenna are adjacent frequency antennas;

[0133] The frequency range of the B41 antenna is 2.5GHz-2.7GHz, and the center frequency 2.6GHz is taken. 2.6GHz / 2.44GHz=1.07, which is in the range of 0.83-1.2, so the B41 antenna and the 2.4G WIFI antenna are adjacent frequency antennas;

[0134] Two N78 antennas, two N79 antennas, two GPS antennas, etc., and two 2.4G WIFI antennas, etc. are all same frequency antennas.

[0135] Please refer to FIG. 3, which is a structural schematic diagram of an antenna module.

[0136] As shown in Fig. 3, the antenna module comprises a first antenna 31' and a second antenna 32', each of which has a radiator, the radiator 311' of the first antenna 31' is provided with a grounding point 312' and a feeding point 313', and the radiator 321' of the second antenna 32' is provided with a grounding point 322' and a feeding point 323'. The two antennas are oppositely arranged at a distance, and the grounding points are away from each other, i.e. in a "mouth-to-mouth" arrangement. Since the ends of the two radiators are close to each other, the signal of the first antenna 31' is easy to cross the gap between the two radiators and reach the feeding source 324' of the second antenna 32' through the radiator 321' of the second antenna 32', resulting in signal coupling. As shown in Fig. 3, in order to prevent the signal of the first antenna 31' from reaching the feeding source 324' of the second antenna 32', a filter circuit 33' is connected in parallel between the feeding point 323' and the feeding source 324' of the second antenna 32', one end of the filter circuit 33' is connected to the circuit between the feeding point 323' and the feeding source 324' of the second antenna 32', and the other end is grounded. It can be understood that the filter circuit can filter out signal impurities and only allow signals of a specific frequency to pass through. Specifically, the filter circuit 33' comprises a capacitor 331' and an inductor 332' connected in series, and the resonant frequency of the filter circuit 33' is adjusted within the working frequency band of the first antenna 31', so that the signal of the first antenna 31' can pass through the filter circuit 33' and reach the ground without reaching the feeding source 324' of the second antenna 32'. Moreover, the resonant frequency of the filter circuit 33' is outside the working frequency band of the second antenna 32', so that the signal of the second antenna 32' is blocked by the capacitor 331' of the filter circuit 33' and can reach the feeding source 324' smoothly. Similarly, a filter circuit 34' can also be connected in parallel between the feeding point 313' and the feeding source 314' of the first antenna 31', so that it is equivalent to a capacitor for the first antenna 31' and a straight-through ground for the second antenna 32', so as to prevent the signal of the second antenna 32' from reaching the feeding source 314' of the first antenna 31'.

[0137] This method can decouple the first antenna 31' and the second antenna 32', but has limitations. According to the decoupling principle described above, only when the resonant frequency of the filter circuit 33' is within the working frequency band of the first antenna 31' and outside the working frequency band of the second antenna 32', the filter circuit 33' can be equivalent to a through-to-ground for the first antenna 31' and equivalent to an open circuit for the second antenna 32'. This requires that the working frequency bands of the first antenna 31' and the second antenna 32' are spaced apart by a certain distance. If the working frequency bands of the two antennas are the same, overlap, or close, it is likely that the filter circuit cannot accurately filter out the signal of one of the antennas, and both antennas are equivalent to a through-to-ground or an open circuit. Therefore, this decoupling method can only work when the first antenna and the second antenna are frequency offset antennas (for example, a GPS antenna and an N78 antenna), and cannot solve the decoupling problem of same-frequency antennas (for example, two 2.4G WIFI antennas) and adjacent-frequency antennas (for example, a B40 antenna and a 2.4G WIFI antenna).

[0138] As can be seen, the layout of antennas in electronic devices is tight, and adjacent same-frequency antennas or adjacent-frequency antennas are severely coupled.

[0139] Therefore, embodiments of the present application provide an antenna module that can decouple same-frequency antennas and adjacent-frequency antennas, thereby alleviating the problem of tight layout of antennas in electronic devices. Embodiments of the present application also provide an electronic device, and the antenna system of the electronic device uses the antenna module provided by the embodiments of the present application, which can decouple same-frequency antennas and adjacent-frequency antennas in the electronic device, thereby ensuring the efficiency of the antenna system even in the case of tight antenna layout.

[0140] The antenna module provided by the embodiments of the present application can be applied to one or more of the following communication technologies: Bluetooth (BT) communication technology, global positioning system communication technology, wireless fidelity communication technology, global system for mobile communications (GSM) technology, wideband code division multiple access (WCDMA) communication technology, long term evolution (LTE) communication technology, 5G communication technology, SUB-6G communication technology, and other future communication technologies.

[0141] The electronic device provided in the embodiments of the present application can be a foldable electronic device or a non-foldable electronic device, and no limitation is made in this regard. The foldable electronic device can be, but is not limited to, a foldable mobile phone, a foldable tablet computer, a foldable notebook computer, a foldable wearable device, and the like. The embodiments of the present application do not make special limitation on the specific form of the foldable electronic device. For the convenience of description, the following description is made by taking a foldable mobile phone as an example.

[0142] Please refer to FIGS. 4a-4b, FIG. 4a is a structural schematic diagram of the electronic device in an unfolded state according to an embodiment of the present application, and FIG. 4b is a structural schematic diagram of the electronic device in a folded state according to an embodiment of the present application.

[0143] As shown in FIGS. 4a-4b, the electronic device 100 is a foldable electronic device, which can be folded and unfolded to switch the form in different use scenarios. It should be noted that the electronic device 100 can be a vertically folding foldable electronic device or a horizontally folding foldable electronic device, and no limitation is made in this regard. For the convenience of description, FIG. 4a shows the length direction X of the electronic device and the width direction Y of the electronic device in the unfolded state. In an embodiment, the electronic device 100 is a vertically folding foldable electronic device, and the main display mode of the main screen is vertical display, or it can be understood that when the electronic device 100 is in the unfolded state shown in FIG. 4a, the user mainly slides the screen along the length direction X of the electronic device.

[0144] The electronic device 100 includes a first display screen 11, a second display screen 12, and a housing assembly 2. The housing assembly 2 includes a first housing 21, a second housing 22, and a hinge mechanism 23. The first housing 21 and the second housing 22 are rotationally connected through the hinge mechanism 23, so that the electronic device 100 can be switched between the folded state and the unfolded state. The first display screen 11 is arranged on one side of the housing assembly 2 and includes a first part 111, a second part 112, and a foldable part 113. The first part 111 is fixedly connected to the first housing 21, the second part 112 is fixedly connected to the second housing 22, and the foldable part 113 is arranged corresponding to the hinge mechanism 23. The second display screen 12 is fixedly connected to the first housing 21 and is arranged opposite to the first part 111 of the first display screen 11 in the thickness direction Z of the first housing.

[0145] The electronic device 100 has a folded state and an unfolded state. For example, when the electronic device 100 is in the unfolded state, the opening angle thereof is 180°, i.e., the included angle between the first housing 21 and the second housing 22 is 180°. It can be understood by those skilled in the art that the opening angle of the electronic device 100 can also be 90°, 120°, 210°, etc., which is not limited in the present application, and the angles exemplified in the present application can also have a slight deviation. For example, when the electronic device 100 is in the unfolded state, the opening angle thereof can be 180°, or about 180°, such as 170°, 175°, 185° or 190°, etc. The same understanding can also be applied to other angles in the following. When the first housing 21 and the second housing 22 are relatively stacked, the electronic device 100 is in the closed state shown in FIG. 4b, and the included angle between the first housing 21 and the second housing 22 can be approximately 0°. In an embodiment, the electronic device 100 is an inner folding electronic device, and when the electronic device 100 is in the folded state, the housing assembly 2 is entirely wrapped outside the first display screen 11.

[0146] It can be understood that the first display screen 11 is the main screen of the electronic device 100, which is entirely laid on the entire housing assembly 2 and has a large display area. The second display screen 12 is the auxiliary screen of the electronic device 100, which is only installed on the first housing 21 and has a small display area. When the electronic device 100 is in the unfolded state shown in FIG. 4a, the first display screen 11 is operated, and when the electronic device 100 is in the unfolded state shown in FIG. 4b, the electronic device 100 is small and portable as a whole, and the second display screen 12 can be operated. It should be noted that the first display screen 11 and the second display screen 12 can be liquid crystal display (LCD), light emitting diode (LED) display or organic light-emitting diode (OLED) display, etc., which is not limited in the present application.

[0147] It can be understood by those skilled in the art that the shell assembly 2 is used to carry and accommodate the first display screen 11, the second display screen 12 and other electronic components, and the specific structure is not limited. In an embodiment, the first shell 21 and the second shell 22 each include an outer frame and a bottom plate, wherein the outer frame is a frame structure arranged circumferentially around the electronic device 100, and the bottom plate is fixedly connected with the outer frame and can serve as a rear cover (also referred to as a battery cover) of the electronic device 100. The outer frame and the bottom plate are collectively surrounded by an accommodation space to accommodate some electronic components, such as a circuit board, a battery, a camera module, a microphone, a loudspeaker, etc., which are not limited by the present application. As shown in FIG. 4b, in an embodiment, the bottom plate 211 of the first shell 21 is provided as a hollow structure, and the second display screen 12 can be embedded in the hollow area thereof, so that the second display screen 12 can be connected with the electronic components inside the electronic device 100 and the first display screen 11

[0148] As shown in FIG. 4b, in an embodiment, the electronic device 100 includes a camera module 31 installed in the first shell 21. It can be understood that the camera module 31 has one or more lenses 311 (two lenses 311 are taken as an example in the figure, and the number of lenses 311 in the camera module 31 is not limited by the present application), and the lenses 311 are exposed outside the first shell 21 and carry the light-in function of the camera module 31. As shown in FIG. 4b, in an embodiment, in order to expand the display area of the second display screen 12, the second display screen 12 is designed to be larger and almost tiling on the entire back of the first shell 21, partially overlapping with the area where the camera module 31 is located. At this time, the area of the second display screen 12 corresponding to the lenses 311 is hollowed out, so that the lenses 311 pass through the second display screen 12 and are exposed outside the electronic device 100.

[0149] Please refer to FIGS. 5a-5d, which are schematic diagrams of the layout of the antenna in the electronic device of the present application.

[0150] As shown in FIGS. 4b-5a, the electronic device 100 further includes a plurality of antennas 34, and the specific number of the antennas 34 is not limited and can be 2, 3, 4, etc. In an embodiment, the electronic device 100 further includes a circuit board 32, which can be a main circuit board of the electronic device 100 and is installed in the first housing 21 to mount various electronic components of the electronic device 100 and control two display screens. The radio frequency module and matching circuit corresponding to each antenna 34 can also be provided on the circuit board 32. The antennas 34 can be provided on the outer frame of each housing of the electronic device, or can be provided on the circuit board 34. When the antennas 34 are provided on the circuit board 32, they can be in the form of an FPC antenna or the like installed as a separate structure on the circuit board 32, or can be in the form of an LDS antenna or the like integrated with the circuit board 32, for example, an antenna pattern etched on a metal layer of the circuit board 32. When the antennas 34 are provided on the outer frame of the housing, the radiators 41 thereof can be in the form of branches or slots, or can be in the form of a patch structure attached to the surface of the outer frame, and the present application is not limited thereto.

[0151] As shown in FIGS. 4b-5a, in an embodiment, the plurality of antennas 34 includes a first antenna 4 and a second antenna 5, and the radiators 41 of the first antenna 4 and the radiators 51 of the second antenna 5 are formed by the outer frame 212 of the first housing 21. In an embodiment, a portion of the outer frame 212 along the extension direction thereof is used as the radiator 41 of the first antenna 4, and a portion thereof is used as the radiator 51 of the second antenna 5, and the radiators of the two antennas 34 are spaced apart by a gap. It should be noted that the outer frame 212 of the first housing 21 can be entirely made of a metal material, or only the region of the outer frame 212 where the antennas are provided can be made of a metal material, and the other regions can be made of a plastic, glass, or the like, and the present application is not limited thereto. Alternatively, the radiators 41 of the first antenna 4 and the radiators 51 of the second antenna 5 can be in the form of a patch structure attached to the surface of the outer frame 212 of the first housing 21, and in this case, the outer frame 212 of the first housing 21 can be entirely made of a non-metal material.

[0152] It can be understood by those skilled in the art that the layout position of the antenna 34 on the electronic device 100 is not limited. As shown in FIGS. 5a-5d, in an embodiment, the antennas 34 of the electronic device 100 are arranged on the outer frame 212 of the first housing 21, i.e., in the upper half region of the electronic device 100, to reduce the line insertion loss between each antenna 34 and the corresponding radio frequency chip. The arrangement position of the first antenna 4 and the second antenna 5 on the first housing 21 is not limited, and can be located on any one of the frame of the first housing 21. Specifically, as shown in FIGS. 5a-5d, the outer frame 212 of the first housing 21 includes a first frame 2121, a second frame 2122, and a third frame 2123 arranged opposite to each other along the width direction Y of the electronic device, and the camera module 31 is located close to the first frame 2121 and the third frame 2123, i.e., the upper left corner of the second display screen 12. As shown in FIGS. 5a-5b, in an embodiment, the first antenna 4 and the second antenna 5 are arranged on the first frame 2121. The positional relationship between the first antenna 4 and the second antenna 5 is not limited. As shown in FIG. 5a, in an embodiment, the first antenna 4 is arranged on the first frame 2121 at a side of the second antenna 5 close to the rotation shaft mechanism 23. As shown in FIG. 5b, in an alternative embodiment, the first antenna 4 is arranged on the first frame 2121 at a side of the second antenna 5 away from the rotation shaft mechanism 23. As shown in FIG. 5c, in an embodiment, the first antenna 4 and the second antenna 5 are arranged on the second frame 2122. As shown in FIG. 5d, the first antenna 4 and the second antenna 5 are arranged on the third frame 2123. It should be noted that the first antenna 4 and the second antenna 5 can be located on the same frame of the first housing 21, or can be located on different frames, for example, one on the first frame 2121 and the other on the second frame 2122, which is not limited in the present application.

[0153] The first antenna 4 and the second antenna 5 can be a quasi-frequency antenna or a same-frequency antenna. The present application creatively proposes a decoupling scheme, which can decouple the signals of the two antennas through the arrangement of the antenna radiator length and the working wave band. The structure of the antenna module, the antenna system, and the position and existence form of each component in the electronic device 100 will be described below with reference to the accompanying drawings to help understand the working principle of the first antenna 4 and the second antenna 5.

[0154] Please refer to FIGS. 6-8, FIG. 6 is a structural schematic diagram of the antenna module of the embodiment of the present application; FIG. 7 is a structural schematic diagram of the first embodiment of the antenna system of the embodiment of the present application; and FIG. 8 is a structural schematic diagram of the second embodiment of the antenna system of the embodiment of the present application.

[0155] As shown in Figures 6 and 7, the antenna system 300 of the electronic device includes an antenna module 200, which includes a first antenna 4 and a second antenna 5. Each antenna in the first antenna 4 and the second antenna 5 includes a radiator and a feed point and a ground point spaced apart on the radiator. The radiator is grounded through the corresponding ground point and receives or transmits radio frequency signals through the corresponding feed point. In one embodiment, the electronic device 100 also includes a ground plane 33, which is spaced apart from the radiator 41 of the first antenna 4 and the radiator 51 of the second antenna 5. The radiators of each antenna in the first antenna 4 and the second antenna 5 are connected to the ground plane 33 through the corresponding ground point for grounding. The specific form and location of the ground plane 33 are not limited. As shown in Figure 6, in one embodiment, the ground plane 33 is located on the circuit board 32, for example, it can be disposed in the metal layer inside the circuit board 32. In other alternative embodiments, the ground plane 33 can also be disposed on the first housing 21, for example, as a metal coating, etc. The ground plane 33 can also be a part of the structure of the first housing 21, for example, the bottom plate of the middle frame constitutes the ground plane 33. This application does not limit this.

[0156] Furthermore, the first end 411 of the radiator 41 of the first antenna 4 and the first end 511 of the radiator 51 of the second antenna 5 are positioned close to each other and spaced apart, while the second end 412 of the radiator 41 of the first antenna 4 and the second end 512 of the radiator 51 of the second antenna 5 are positioned away from each other. In both the first antenna 4 and the second antenna 5, the grounding point of each antenna is located at the second end of its respective radiator, and the feed point of each antenna is located at the first end of its respective radiator or between the first and second ends. Alternatively, it can be understood that the grounding points of both antennas are located at the second ends of their respective radiators, and the feed points are located at the first ends of their respective radiators or between the first and second ends; that is, feed points can be set anywhere on the radiator of each antenna other than the grounding point. Positioning the first ends of the two antennas close to each other and spaced apart can be understood as using a "mouth-to-mouth" arrangement, so that the feed points of the two antennas are opposite each other.

[0157] Furthermore, the operating frequency bands of the first antenna 4 include a first frequency band (see Figure 13a below) and a second frequency band (see Figure 13a below), and the operating frequency bands of the second antenna 5 include a third frequency band. Alternatively, the first antenna 4 can be understood as a multi-frequency antenna, comprising at least two operating frequency bands, and the second antenna 5 can be a single-frequency antenna or a multi-frequency antenna, comprising at least one operating frequency band. It should be noted that this application does not limit the specific number of operating frequency bands for the first antenna 4 and the second antenna 5. The first antenna 4 may have only two operating frequency bands, or it may have three, four, or more operating frequency bands. The second antenna 5 may have only one operating frequency band, or it may have two, three, or more operating frequency bands.

[0158] In one implementation, the center frequency of the second frequency band is f.1mid , the center frequency of the third frequency band is f 2mid , Or it can be understood that the ratio of the center frequencies of the second frequency band and the third frequency band is in the range of 0.83-1.2, and the two frequency bands are adjacent frequency bands or the same frequency band, and the first antenna 4 and the second antenna 5 are adjacent frequency antennas or same frequency antennas. It should be noted that the ratio of the center frequencies of the second frequency band and the third frequency band can also be outside the range of 0.83-1.2, such as 0.82, 1.25, etc., which is not limited in the present application.

[0159] It can be understood that the first antenna 4 and the second antenna 5 need to be connected with the corresponding radio frequency module to feed the corresponding antenna through the radio frequency module, so as shown in FIG. 7, the antenna system 300 further includes a first radio frequency module 61 and a second radio frequency module 62, the first radio frequency module 61 is used to transmit radio frequency signals to the feed point 42 of the first antenna 4 or receive radio frequency signals from the feed point 42 of the first antenna 4, or it can be understood that the first radio frequency module 61 is used to transmit radio frequency signals to the feed point 42 of the first antenna 4, and the second radio frequency module 62 is used to transmit radio frequency signals to the feed point 52 of the second antenna 5 or receive radio frequency signals from the feed point 52 of the second antenna 5, or it can be understood that the second radio frequency module 62 is used to transmit radio frequency signals to the feed point 52 of the second antenna 5.

[0160] The specific number of the first radio frequency module 61 and the second radio frequency module 62 is not limited, and the number of each radio frequency module can correspond to the number of frequency bands of the corresponding antenna, or can not correspond, which is not limited in the present application. As shown in FIG. 7, in one example scenario, the first antenna 4 has two working frequency bands (i.e., the first frequency band and the second frequency band), and the antenna system 300 includes two first radio frequency modules 61 to transmit (which can be understood as sending or receiving) radio frequency signals of the two working frequency bands to the first antenna 4 respectively. Among them, the two first radio frequency modules 61 are connected in parallel, and are both electrically connected with the feed point 42 of the first antenna 4. Alternatively, the first frequency band and the second frequency band can share one first radio frequency module 61, and two working frequency bands of radio frequency signals are transmitted to the first antenna 4 through one first radio frequency module 61 at the same time, at this time only one first radio frequency module 61 in the antenna system 300 is needed. The number and setting mode of the second radio frequency module 62 can be understood with reference to the first radio frequency module 61, which will not be repeated here.

[0161] As shown in FIG. 8, in one embodiment, the operating frequency band of the first antenna 4 further includes a fourth frequency band (see FIG. 13b below), i.e., the first antenna 4 has three operating frequency bands of the first frequency band, the second frequency band and the fourth frequency band, and the antenna system 300 has three first radio frequency modules 61 for respectively transmitting radio frequency signals of the three operating frequency bands to the first antenna 4. The three first radio frequency modules 61 are connected in parallel and are connected to the feeding point 42 of the first antenna 4 (or one first radio frequency module 61 can be used to simultaneously transmit radio frequency signals of the three operating frequency bands to the first antenna 4, or two of the three operating frequency bands share one first radio frequency module 61 and the other operating frequency band has a separately arranged first radio frequency module 61). The operating frequency band of the second antenna 5 further includes a fifth frequency band (see FIG. 13b below), i.e., the second antenna 5 has two operating frequency bands of the third frequency band and the fifth frequency band, and the antenna system 300 has two second radio frequency modules 62 for respectively transmitting radio frequency signals of the two operating frequency bands to the second antenna 5. The two second radio frequency modules 62 are connected in parallel and are electrically connected to the feeding point 52 of the second antenna 5. It should be noted that one second radio frequency module 62 can be used to simultaneously transmit radio frequency signals of the two operating frequency bands to the second antenna 5, and only one second radio frequency module 62 is needed in the antenna system 300.

[0162] In one embodiment, the center frequency of the fourth frequency band is f 4mid , and the center frequency of the fifth frequency band is f 5mid , i.e., the fourth frequency band and the fifth frequency band are also arranged as adjacent frequency bands or the same frequency band. It should be noted that the ratio of the center frequencies of the fourth frequency band and the fifth frequency band can also be outside the range of 0.83-1.2, such as 0.82, 1.25, etc., which is not limited in the present application.

[0163] Those skilled in the art can understand that the first radio frequency module 61 and the second radio frequency module 62 can be arranged on the circuit board 32, and the type and form of each radio frequency module are not limited in the present application. In one embodiment, each radio frequency module is a radio frequency chip, and the radio frequency chip is arranged on the circuit board 32 and is connected to the feeding point of the corresponding antenna through a wire.

[0164] As shown in FIG. 7-8, in one embodiment, the antenna system 300 further comprises a first impedance matching circuit 71 disposed on the circuit between the first RF module 61 and the feed point 42 of the first antenna 4. Those skilled in the art can understand that the impedance matching circuit can adjust the impedance matching between the antenna and the RF module to obtain the maximum transmission power. By disposing the first impedance matching circuit 71 between the first antenna 4 and the first RF module 61, different operating modes of the first antenna 4 can be excited by adjusting the first impedance matching circuit 71, and the radiation performance of the first antenna 4 can be optimized. In one embodiment, the antenna system 300 further comprises a second impedance matching circuit 72 disposed on the circuit between the second RF module 62 and the feed point 52 of the second antenna 5, for adjusting the impedance matching of the second antenna 5. The specific circuit structure of the first impedance matching circuit 71 and the second impedance matching circuit 72 is not limited in the present application, which is illustrated below.

[0165] Please refer to FIG. 9a-9b, FIG. 9a is a circuit diagram of the first impedance matching circuit in the antenna system of the embodiment of the present application; FIG. 9b is a circuit diagram of the second impedance matching circuit in the antenna system of the embodiment of the present application.

[0166] As shown in FIG. 9a, in one embodiment, the first impedance matching circuit 71 includes a fifth capacitor 711, a sixth capacitor 712 and a third inductor 713, the fifth capacitor 711 and the third inductor 713 are connected in series between the first radio frequency module 61 and the feeding point 42 of the first antenna 4, one end of the sixth capacitor 712 is connected between the third inductor 713 and the first radio frequency module 61, and the other end is grounded. The impedance matching of the first antenna 4 can be adjusted by adjusting the fifth capacitor 711, the sixth capacitor 712 and the third inductor 713. As shown in FIG. 9b, in one embodiment, the second impedance matching circuit 72 includes a seventh capacitor 721, an eighth capacitor 722 and a fourth inductor 723, the seventh capacitor 721 and the fourth inductor 723 are connected in series between the second radio frequency module 62 and the feeding point 52 of the second antenna 5, one end of the eighth capacitor 722 is connected between the fourth inductor 723 and the second radio frequency module 62, and the other end is grounded. The impedance matching of the second antenna 5 can be adjusted by adjusting the fifth capacitor 711, the eighth capacitor 722 and the fourth inductor 723. It can be understood by those skilled in the art that each of the above-mentioned capacitors and inductors can be arranged on the circuit board 32 or other positions, which is not limited in the present application. It should be noted that the specific components of the impedance matching circuit can be designed according to the working frequency band of each antenna, and the above-mentioned circuit is only an example. In other alternative embodiments, the first impedance matching circuit 71 and the second impedance matching circuit 72 can also adopt other structures, for example, only including an inductor connected in parallel between the antenna and the radio frequency module, or only including a circuit connected in series between the antenna and the radio frequency module, etc., which is not limited in the present application.

[0167] Please refer to FIGS. 10a-12d, FIG. 10a is a structural schematic diagram of a first embodiment of the filtering circuit in the antenna system of the present application; FIG. 10b is a structural schematic diagram of a second embodiment of the filtering circuit in the antenna system of the present application; FIG. 10c is a circuit diagram of the first filtering circuit in the antenna system of the present application; FIG. 11a is a structural schematic diagram of a third embodiment of the filtering circuit in the antenna system of the present application; FIG. 11b is a structural schematic diagram of a fourth embodiment of the filtering circuit in the antenna system of the present application; FIG. 11c is a circuit diagram of the second filtering circuit in the antenna system of the present application; FIG. 12a is a structural schematic diagram of a fifth embodiment of the filtering circuit in the antenna system of the present application; FIG. 12b is a structural schematic diagram of a sixth embodiment of the filtering circuit in the antenna system of the present application; FIG. 12c is a structural schematic diagram of a seventh embodiment of the filtering circuit in the antenna system of the present application; FIG. 12d is a structural schematic diagram of an eighth embodiment of the filtering circuit in the antenna system of the present application.

[0168] As shown in FIGS. 10a-10c, in one embodiment, the antenna system 300 further comprises a first filter circuit 81 for extending the decoupling bandwidth in the first decoupling frequency band mentioned below. The first filter circuit 81 can filter out the interference signals in the first decoupling frequency band, improving the isolation of the two antennas. The first filter circuit 81 can be arranged on the feed circuit of the first antenna 4 or on the feed circuit of the second antenna 5, which is not limited in the present application. As shown in FIG. 10a, in one embodiment, one end of the first filter circuit 81 is connected to the circuit between the feed point 42 of the first antenna 4 and the plurality of first radio frequency modules 61, and the other end is grounded, for filtering out the signals in the interference frequency band (for example, the third frequency band of the second antenna 5, wherein the second frequency band of the first antenna 4 is adjacent to the third frequency band of the second antenna 5, i.e., there is no overlapping frequency band) that can interfere with the first antenna 4 by the second antenna 5. As shown in FIG. 10b, in an alternative embodiment, one end of the second filter circuit 82 is connected to the circuit between the feed point 52 of the second antenna 5 and the second radio frequency module 62, and the other end is grounded, for filtering out the signals in the interference frequency band (for example, the second frequency band of the first antenna 4, wherein the second frequency band of the first antenna 4 is adjacent to the third frequency band of the second antenna 5, i.e., there is no overlapping frequency band) that can interfere with the second antenna 5 by the first antenna 4. The filter circuit has the function of signal selection and interference suppression, and can filter out impurities in the signal. The "signals in the interference frequency band that can interfere with the first antenna 4 by the second antenna 5" can be understood as the signals in the frequency band of the working frequency band of the second antenna 5 that interfere with the first antenna 4, and the interference signals of the second antenna 5 are filtered out by the first filter circuit 81, which can improve the purity of the signal of the first antenna 4 and to a certain extent, improve the isolation between the first antenna 4 and the second antenna 5. The "signals in the interference frequency band that can interfere with the second antenna 5 by the first antenna 4" can be understood as the signals in the frequency band of the working frequency band of the first antenna 4 that interfere with the second antenna 5, and the interference signals of the first antenna 4 are filtered out by the second filter circuit 82, which can improve the purity of the signal of the second antenna 5 and to a certain extent, improve the isolation between the two antennas.

[0169] It should be noted that the present application does not limit the specific circuit composition of the first filter circuit 81. As shown in FIG. 10c, in one embodiment, the first filter circuit 81 comprises a third capacitor 811 and a first inductor 812 connected in series. When the first filter circuit 81 is arranged on the feed circuit of the first antenna 4, the series resonance frequency f a1 in the first interference frequency band that can interfere with the first antenna 4 by the second antenna 5. It can be understood that the resonance frequency f a1The first interference frequency band of the second antenna 5 can be within the first interference frequency band of the first antenna 4, and signals in the first interference frequency band can pass through the first interference frequency band. Since one end of the first filter circuit 81 is grounded, the signals in the first interference frequency band pass through the first filter circuit 81 and directly pass through the ground, so as not to pass through the circuit between the first antenna 4 and the first radio frequency module 61, thereby avoiding interference with the first antenna 4. Similarly, when the first filter circuit 81 is arranged on the feeding circuit of the second antenna 5, the series resonance circuit formed by the third capacitor 811 and the first inductor 812 has a series resonance frequency f a1 The first interference frequency band of the first antenna 4 can be within the first interference frequency band of the second antenna 5, so as to directly pass the signals in the first interference frequency band through the ground, thereby avoiding affecting the second antenna 5.

[0170] As shown in FIGS. 11a-11c, in an embodiment, the antenna system 300 can further be provided with a second filter circuit 82, which is used to expand the decoupling bandwidth of the second decoupling frequency band mentioned below. The second filter circuit 82 is different from the first filter circuit 81, and the second filter circuit 82 can filter out the interference signals in the second decoupling frequency band, thereby improving the isolation of the two antennas. As shown in FIG. 11a, in an embodiment, the second filter circuit 82 can be arranged on the feeding circuit of the first antenna 4, one end of which is connected to the circuit between the feeding point 42 of the first antenna 4 and the plurality of first radio frequency modules 61, and the other end is grounded, so as to filter out the signals in the interference frequency band (for example, the fifth frequency band of the second antenna 5, wherein the fourth frequency band of the first antenna 4 and the fifth frequency band of the second antenna 5 are adjacent, i.e., there is no overlapping frequency band) that can interfere with the first antenna 4. As shown in FIG. 11b, in an alternative embodiment, the second filter circuit 82 can also be arranged on the feeding circuit of the second antenna 5, one end of which is connected to the circuit between the feeding point 52 of the second antenna 5 and the second radio frequency module 62, and the other end is grounded, so as to filter out the signals in the interference frequency band (for example, the fourth frequency band of the first antenna 4, wherein the fourth frequency band of the first antenna 4 and the fifth frequency band of the second antenna 5 are adjacent, i.e., there is no overlapping frequency band) that can interfere with the second antenna 5. The specific structure of the second filter circuit 82 is not limited, as shown in FIG. 11c, in an embodiment, the second filter circuit 82 can include a fourth capacitor 821 and a second inductor 822 connected in series, the fourth capacitor 821 and the second inductor 822 form a series resonance circuit, and have a series resonance frequency f a2 The resonance frequency f a2 of the second filter circuit 82 is adjusted, so as to filter out the interference signals. The principle of filtering out the interference signals can be understood with reference to the first filter circuit 81, and will not be described herein.

[0171] As can be seen from the foregoing, multiple operating frequency bands can be provided in each of the first antenna and the second antenna, and the different frequency bands of the two antennas can interfere with each other, forming multiple frequency bands that need to be filtered out. For example, the second frequency band of the first antenna 4 and the third frequency band of the second antenna 5 can interfere with each other, at which time, the first filter circuit 81 can be provided to improve the isolation of the second frequency band and the third frequency band. If the first filter circuit 81 is provided on the circuit of the first antenna 4, the resonant frequency f a1 is adjusted to be within the third frequency band range, and at the same time, is adjusted to be outside the second frequency band range, so that the signal in the third frequency band is equivalent to being directly passed to the ground. Conversely, if the first filter circuit 81 is provided on the circuit of the second antenna 5, the resonant frequency f a1 is adjusted to be within the second frequency band range, and at the same time, is adjusted to be outside the third frequency band range, so that the signal in the second frequency band is equivalent to being directly passed to the ground. The fourth frequency band of the first antenna 4 and the fifth frequency band of the second antenna 5 can interfere with each other, at which time, the second filter circuit 82 can be provided to improve the isolation of the fourth frequency band and the fifth frequency band. If the second filter circuit 82 is provided on the circuit of the first antenna 4, the resonant frequency f a2 is adjusted to be within the fifth frequency band range, and at the same time, is adjusted to be outside the fourth frequency band range, so that the signal in the fifth frequency band is equivalent to being directly passed to the ground. Conversely, if the second filter circuit 82 is provided on the circuit of the second antenna 5, the resonant frequency f a2 is adjusted to be within the fourth frequency band range, and at the same time, is adjusted to be outside the fifth frequency band range, so that the signal in the fourth frequency band is equivalent to being directly passed to the ground.

[0172] The second frequency band of the first antenna 4 and the third frequency band of the second antenna 5 can interfere with each other or can not interfere with each other. Meanwhile, the fourth frequency band of the first antenna 4 and the fifth frequency band of the second antenna 5 can interfere with each other or can not interfere with each other while the second frequency band of the first antenna 4 and the third frequency band of the second antenna 5 form interference. Therefore, the first filter circuit 81 can be arranged in the antenna system 300, or the second filter circuit 82 can be arranged in the antenna system 300, or the first filter circuit 81 and the second filter circuit 82 can be arranged in the antenna system 300. When more frequency bands are arranged in the two antennas and other frequency bands also form interference, a third filter circuit, a fourth filter circuit, etc. can also be arranged in the antenna system 300, which is not limited in the application. As shown in FIG. 12a, in an embodiment, the first filter circuit 81 and the second filter circuit 82 are arranged in the antenna system 300, wherein the first filter circuit 81 is arranged on the circuit of the first antenna 4, and the second filter circuit 82 is arranged on the circuit of the second antenna 5. As shown in FIG. 12b, in an alternative embodiment, the first filter circuit 81 is arranged on the circuit of the second antenna 5, and the second filter circuit 82 is arranged on the circuit of the first antenna 4. As shown in FIG. 12c, in an alternative embodiment, the first filter circuit 81 and the second filter circuit 82 are both arranged on the circuit of the first antenna 4, and the two filter circuits are connected in parallel. As shown in FIG. 12d, in an alternative embodiment, the first filter circuit 81 and the second filter circuit 82 can also be arranged on the circuit of the second antenna 5, and the two filter circuits are connected in parallel. How the filter circuits are arranged in the antenna system 300 and how the filter circuits are arranged on the circuit of which antenna will be illustrated below in combination with the working frequency bands of the antennas.

[0173] The above mainly describes the structure of the electronic device 100 and the composition of the antenna system 300 in the electronic device 100 to roughly explain the application scenario and working principle of the antenna module 200 in the embodiment of the application. The principle and design idea of decoupling the first antenna 4 and the second antenna 5 in the antenna module 200 will be further described below.

[0174] As shown in FIG. 6, it can be understood from the above that the antenna module 200 includes the first antenna 4 and the second antenna 5, and the first antenna 4 and the second antenna 5 adopt a "mouth-to-mouth" arrangement form so that the feed points of the two antennas are opposite. The working frequency bands of the first antenna 4 include a first frequency band and a second frequency band, and the working frequency bands of the second antenna 5 include a third frequency band. It can be understood that the first end 411 of the radiator 41 of the first antenna 4 and the first end 511 of the radiator 51 of the second antenna 5 have a gap s, and the size of the gap s is not limited in the application. In an embodiment, 1 mm≤s≤3 mm, for example, 1 mm, 2 mm, or 3 mm. In other alternative embodiments, s can also be less than 1 mm or greater than 3 mm.

[0175] It should be noted that the present application does not limit the specific position of the feed point on the radiator of each antenna. In an embodiment, the feed point 42 of the first antenna 4 is located between the first end 411 and the midpoint 410 of the radiator 41 of the first antenna 4, wherein the midpoint 410 of the radiator 41 of the first antenna 4 is the midpoint between the ground point 43 and the first end 411. The feed point 52 of the radiator 51 of the second antenna 5 can be located at any position between the ground point 53 and the first end 511. As shown in FIG. 6, in an embodiment, the feed point 52 of the second antenna 5 is located between the first end 511 and the midpoint 510 of the radiator 51 of the second antenna 5, wherein the midpoint 510 of the radiator 51 of the second antenna 5 is the midpoint between the ground point 53 and the first end 511. In an alternative embodiment, the feed point 52 of the second antenna 5 is located between the midpoint 510 and the ground point 53 of the radiator 51 of the second antenna 5 (for example, the structure shown in FIG. 23a), which can be understood as arranging the second antenna 5 as an IFA antenna (IFA Inverted-F Antenna, inverted-F antenna).

[0176] Referring to FIGS. 13a-15, FIG. 13a is a relationship diagram of each frequency band in the antenna module of the embodiment of the present application; FIG. 13b is a relationship diagram of each frequency band in the antenna module of the embodiment of the present application; FIG. 14 is an electromagnetic wave distribution diagram of the antenna module of the embodiment of the present application; and FIG. 15 is an electric field simulation diagram of the antenna module of the embodiment of the present application.

[0177] As shown in FIG. 13a, the working frequency band of the first antenna 4 includes a first frequency band and a second frequency band, and the working frequency band of the second antenna 5 includes a third frequency band. Further, the first frequency band is lower than the second frequency band and the third frequency band as a whole, and the second frequency band is adjacent to or partially overlaps or completely overlaps with the third frequency band. Adjacent can be understood as that the frequency band distance between the second frequency band and the third frequency band is close but not overlapping, for example, adjacent frequency (for example, 2.4G WIFI frequency band and B41 frequency band, the two frequency bands have no overlapping area, but the center frequency ratio is within the range of 0.83-1.2, which belongs to the case of adjacent frequency); partial overlap means that a part of the second frequency band and the third frequency band overlaps, for example, adjacent frequency (for example, 2.4G WIFI frequency band and B40 frequency band, the two frequency bands overlap at 2.4GHz and the center frequency ratio is within the range of 0.83-1.2, which also belongs to the case of adjacent frequency); and complete overlap means that the second frequency band and the third frequency band are completely the same, for example, same frequency (for example, both are 2.4G WIFI frequency band). That is, the first antenna 4 and the second antenna 5 are same frequency antennas or adjacent frequency antennas.

[0178] Further, as shown in FIG. 6, the length of the radiator 41 of the first antenna 4 is L1, n1 is an integer greater than or equal to 1, and λ1 is the wavelength of electromagnetic wave with frequency f1 in the working environment, and the frequency f1 is located in the first decoupling frequency band of the antenna module 200, the first decoupling frequency band is f11 ~f 12 ,f 11 is the lowest frequency in the second frequency band and the third frequency band, f 12 is the highest frequency in the second frequency band and the third frequency band. As shown in FIG. 6, the length L1 of the radiator 41 of the first antenna 4 is the length between the ground point 43 and the first end 411 of the radiator 41 of the first antenna 4. The first decoupling frequency band f 11 ~f 12 represents the frequency range between the lowest frequency and the highest frequency in the second frequency band and the third frequency band, i.e., the shortest frequency band range capable of covering the second frequency band and the third frequency band. The frequency f1 can be any frequency between f 11 and f 12 . λ1 is the wavelength corresponding to the frequency f1.

[0179] The present application does not limit the specific length of the radiators of the first antenna 4 and the second antenna 5. In an embodiment, λ 01 / 8≤L1≤λ 01 / 4, where λ 01 is the wavelength corresponding to any frequency in the first reference frequency band, the lowest frequency of the first reference frequency band is lower than the lowest frequency of the first frequency band by a first preset threshold value, and the highest frequency of the first reference frequency band is higher than the highest frequency of the first frequency band by a second preset threshold value. In an example scenario, the first frequency band is a low band (LB) frequency band, the lowest frequency of which is 0.7 GHz, and the highest frequency of which is 0.96 GHz, and the first preset threshold value and the second preset threshold value are both 0.1 GHz. Therefore, the first reference frequency band is 0.6 GHz to 1.06 GHz. λ 01 is the wavelength corresponding to any frequency in the first reference frequency band. When λ 01 is 0.6 GHz, it can be calculated from λ 01 / 8≤L1≤λ 01 / 4 that 62.5 mm≤L1≤125 mm. When λ 01 is 1.06 GHz, it can be calculated from λ 01 / 8≤L1≤λ 01 / 4 that 35.3 mm≤L1≤70.7 mm. Therefore, L1 is in the range of 35.3 mm to 125 mm as a whole. The values of the first preset threshold value and the second preset threshold value can be adjusted according to actual conditions, which are not limited by the present application.

[0180] Similarly, the length L2 of the radiator 51 of the second antenna 5 (L2 is the length between the ground point 53 and the first end 511 of the radiator 51 of the second antenna 5), in an embodiment, λ 02 / 8≤L2≤λ 02 / 4, where λ02 is the wavelength corresponding to any frequency in the second reference frequency band, the lowest frequency of the second reference frequency band is lower than the lowest frequency of the lowest working frequency band of the second antenna 5 by a third preset threshold, and the highest frequency of the second reference frequency band is higher than the highest frequency of the lowest working frequency band of the second antenna 5 by a fourth preset threshold. In an example scenario, the lowest working frequency band of the second antenna 5 is the 2.4G WIFI frequency band, the lowest frequency of which is 2.4GHz, the highest frequency of which is 2.48GHz, the first preset threshold is 0.05GHz, and the second preset threshold is 0.12GHz. Therefore, the second reference frequency band is 2.35GHz-2.6GHz. 02 is the wavelength corresponding to any frequency in the second reference frequency band, when 02 is taken as 2.35GHz, it can be calculated from 02 / 8≤L2≤λ 02 / 4 that 15.9mm≤L2≤31.9mm. When 02 is taken as 2.6GHz, it can be calculated from 02 / 8≤L2≤λ 02 / 4 that 14.4mm≤L2≤28.8mm. Therefore, L2 is located in the range of 14.4mm-28.8mm as a whole. The values of the third preset threshold and the fourth preset threshold can be adjusted according to actual conditions, and the application does not limit this.

[0181] Further, the length L1 of the radiator 41 of the first antenna 4 is set as: n1 is an integer greater than or equal to 1, which can change 1λ1、 times the frequency difference mode. As shown in FIG. 14, when the first antenna 4 works in these times the frequency difference mode, the electromagnetic wave around the radiator 41 of the first antenna 4 is distributed in the form of one period of cosine wave, one period of cosine wave, one period of cosine wave, etc. At this time, the electric field of the first antenna 4 is limited around the radiator 41, and the electric field at both ends of the radiator 41 is weak, thereby weakening the coupling degree of the two antennas.

[0182] As shown in FIG. 15, FIG. 15 simulates the electric field distribution of the first antenna 4 and the second antenna 5 when the first antenna 4 works in λ1times the frequency difference mode. As shown in FIG. 14, the electromagnetic wave around the radiator 41 of the first antenna 4 is distributed in the form of a cosine wave form distribution, and the electric field distribution of the second antenna 5 in FIG. 15 presents a state of strong in the middle and weak at both ends, and the coupling degree of the first end 411 of the radiator 41 of the second antenna 5 is also weakened accordingly. It should be noted that the present application does not limit the length, working mode, electric field distribution, etc. of the radiator 51 of the second antenna 5. As shown in FIGS. 14-15, in an embodiment, the electromagnetic wave around the radiator 51 of the second antenna 5 can present a cosine wave form distribution, and the electric field of the second end 512 is weak and the electric field of the first end 511 is strong. Even though the electric field of the first end 511 of the radiator 51 of the second antenna 5 is strong, the first antenna 4 and the second antenna 5 still have a good decoupling effect because the electric field intensity of the first antenna 4 at the first end 411 is weak.

[0183] Further, the position of the frequency f1 will generate a decoupling pit, which is specifically manifested as that the S21 curve (for reference, FIGS. 19 and 20 in the following text, the S21 parameter can represent the isolation of the antenna, the smaller the S21 parameter, the higher the isolation of the second frequency band and the third frequency band, and the better the decoupling effect) in the antenna efficiency diagram produces a trough at the frequency point f1, and the S21 curve in a frequency range on both sides of the frequency point f1 is also pulled down by the decoupling pit, so that the isolation in the frequency range around f1 is improved. Since f1 is located in the first decoupling frequency band, the first decoupling frequency band covers the second frequency band and the third frequency band, so the isolation of the second frequency band and the third frequency band is improved, realizing the same frequency decoupling or adjacent frequency decoupling between the first antenna 4 and the second antenna 5. In the compact layout of the electronic device 100, even if the first antenna 4 and the second antenna 5 are arranged close to each other, the isolation of the two is relatively high, avoiding the influence of signal coupling between the two on the communication quality of the electronic device 100.

[0184] Therefore, the antenna module 200 provided by the embodiment of the present application can realize the decoupling between adjacent antennas of the same frequency or adjacent frequency, and alleviate the problem of tight layout of the antenna in the electronic device 100.

[0185] The antenna module 200 provided by the present application can also decouple multiple frequency bands of the first antenna 4 and the second antenna 5. Specifically, as shown in FIG. 13b, when the working frequency band of the first antenna 4 further includes a fourth frequency band and the working frequency band of the second antenna 5 further includes a fifth frequency band, the first frequency band is lower than the fourth frequency band and the fifth frequency band as a whole, and the fourth frequency band and the fifth frequency band are adjacent or partially overlap or completely overlap. And, n2 is an integer greater than or equal to 1 and different from n1, and λ2 is: the wavelength of the electromagnetic wave with frequency f2 in the working environment, the frequency f2 is located in the second decoupling frequency band of the antenna module 200, the second decoupling frequency band is f 21 22 21 f is the lowest frequency in the fourth frequency band and the fifth frequency band.​​22 is the highest frequency in the fourth frequency band and the fifth frequency band; the second decoupling frequency band is not overlapped with the first decoupling frequency band. Regarding λ2, n2 and the second decoupling frequency band f 21 ~f 22 λ1, n1 and the second decoupling frequency band f 11 ~f 12 The same understanding is not repeated here.

[0186] By selecting f2, λ2 is changed, and by adjusting λ2 and n2, the length L1 of the radiator 41 of the first antenna 4 is adjusted, so that the first antenna 4 works in 1λ2、 an equal frequency difference mode, so that the electromagnetic wave around the radiator 41 of the first antenna 4 is distributed in the form of one cosine wave period, one cosine wave period, one cosine wave period, etc., at this time, the electric field of the first antenna 4 is limited around the radiator 41, and the electric field at both ends of the radiator 41 is weak, thereby weakening the coupling degree of the two antennas. And the position of the frequency f2 will produce a decoupling pit, which is specifically manifested as that the S21 curve in the antenna efficiency diagram also produces a trough at the frequency point f2, and the S21 curve in a frequency range on both sides of the frequency point f2 is also pulled down by the decoupling pit, so that the isolation in the frequency range around f2 is improved. Since f2 is located in the second decoupling frequency band, the second decoupling frequency band covers the fourth frequency band and the fifth frequency band, so the isolation of the fourth frequency band and the fifth frequency band is improved. Therefore, the antenna module 200 provided in the embodiment of the present application can realize decoupling of multiple frequency bands of the first antenna 4 and the second antenna 5.

[0187] It should be noted that the length L1 of the radiator 41 of the first antenna 4 needs to meet and, that is Under normal circumstances, the first decoupling frequency band is far away from the second decoupling frequency band, f1 and f2 must be different, λ1 and λ2 must be different, and it can be deduced that It can be seen that n1 and n2, λ1 and λ2 are in a multiple relationship. For example, f2 = 2xf1, then At this time, the values of n1 and n2 should satisfy n2 = 2xn1 (for example, n1 takes 1, and n2 takes 2), so that then the length L1 of the radiator 41 of the first antenna 4 can meet and,

[0188] It should be noted that the specific operating frequency bands of the first antenna 4 and the second antenna 5 are not limited in the present application. In one embodiment, the first frequency band ranges from 0.7 GHz to 0.96 GHz, the second frequency band ranges from 2.3 GHz to 2.4 GHz or 2.5 GHz to 2.7 GHz or 2.4 MHz to 2.48 GHz, and the third frequency band ranges from 2.4 GHz to 2.48 GHz. In an alternative embodiment, the second frequency band ranges from 4.4 GHz to 5.0 GHz, and the third frequency band ranges from 5.17 GHz to 5.835 GHz.

[0189] In one embodiment, the operating frequency band of the first antenna 4 includes a fourth frequency band, and the operating frequency band of the second antenna 5 includes a fifth frequency band. The second frequency band ranges from 2.3 GHz to 2.4 GHz or 2.5 GHz to 2.7 GHz or 2.4 GHz to 2.48 GHz, the third frequency band ranges from 2.4 GHz to 2.48 GHz, the fourth frequency band ranges from 4.4 GHz to 5.0 GHz, and the fifth frequency band ranges from 5.17 GHz to 5.835 GHz. At this time, the second decoupling frequency band is approximately twice the first decoupling frequency band. The values of f1 and f2 are designed as f2 = 2 x f1, and then n1 = 1, n2 = 2, In an alternative embodiment, when the second frequency band ranges from 4.4 GHz to 5.0 GHz and the third frequency band ranges from 5.17 GHz to 5.835 GHz, the fourth frequency band ranges from 2.3 GHz to 2.4 GHz or 2.5 GHz to 2.7 GHz or 2.4 GHz to 2.48 GHz, and the fifth frequency band ranges from 2.4 GHz to 2.48 GHz. At this time, the first decoupling frequency band is approximately twice the second decoupling frequency band. The values of f1 and f2 are designed as f1 = 2 x f2, and then n1 = 2, n2 = 1,

[0190] The specific values of the above parameters will be illustrated in the following examples, which will not be repeated here.

[0191] After understanding the basic principles of the antenna module 200 of the present application for decoupling the same-frequency or adjacent-frequency antennas, the design process of the antenna module 200 will be described in the following specific embodiments, including the selection of the operating frequency bands of the antennas, the generation of the decoupling pits, the optimization of the isolation, and other steps, to better understand the essence of the antenna module 200 provided by the present application.

[0192] Please refer to FIG. 16, which is a schematic diagram of different operating modes of the first antenna in the antenna module of the embodiment of the present application.

[0193] As shown in FIG. 9a and FIG. 16, the first impedance matching circuit 71 is arranged between the first antenna 4 and the first radio frequency module 61. By adjusting the first impedance matching circuit 71, different working modes of the first antenna 4 can be excited. Specifically, as shown in FIG. 16, the first antenna 4 can work in and the like. By connecting a capacitor (for example, the fifth capacitor 711 in FIG. 9a) in series in the first impedance matching circuit 71, and feeding the first antenna 4, the first antenna 4 can work in the CRLH (Composite right / left handed, composite right / left handed) mode, and the and the like can be excited. Wherein, λ represents the wavelength corresponding to the center frequency of the frequency band corresponding to the mode. For example, if the first antenna 4 is required to work in the LB frequency band, the low-frequency mode can be excited by adjusting the first impedance matching circuit 71, and the mode is adjusted within the LB frequency band range, at this time the λ in the mode is the wavelength corresponding to the center frequency of the LB frequency band. Alternatively, an inductor can be connected in parallel in the first impedance matching circuit 71 to excite the and the like, and obtain the required working frequency band. Alternatively, the first impedance matching circuit 71 can be arranged in the form of FIG. 9a, and the above-mentioned several modes can be excited at the same time. For example, the LB frequency band is taken as the first frequency band of the first antenna 4, and the N79 frequency band is taken as the second frequency band of the first antenna 4. When the fifth capacitor 711, the third inductor 713, and the sixth capacitor 712 of the first impedance matching circuit 71 are fed at the same time, the and the like are excited at the same time, the mode is adjusted within the LB frequency band range, and the mode is adjusted within the N79 frequency band range, then the LB frequency band and the N79 frequency band of the first antenna 4 can work normally. It can be understood that the second antenna 5 can also be excited to different working modes by the second impedance matching circuit 72, which will not be described herein.

[0194] Please refer to FIG. 17-FIG. 20, FIG. 17 is a circuit diagram of the first embodiment of the antenna module of the present application; FIG. 18 is an electromagnetic wave distribution diagram of the first embodiment of the antenna module of the present application; FIG. 19 is a response curve diagram of each antenna in the first embodiment of the antenna module of the present application; and FIG. 20 is a response curve diagram of each antenna in the second embodiment of the antenna module of the present application.

[0195] As shown in FIG. 19, S11 is the response curve of the first antenna 4, the fifth capacitor 711 of the first antenna 4 is fed to work in the CRLH mode, and the S11 curve produces a sharp response in the and the like. By adjusting the The mode makes the first antenna 4 work in the LB frequency band, and the second impedance matching circuit 72 is adjusted to make the second antenna 5 work in the 2.4G WIFI frequency band and the 5G WIFI frequency band. The mode makes the first antenna 4 work in the B41 frequency band, The mode is a redundant high-order mode, which can be eliminated subsequently. The S22 is the response curve of the second antenna 5, and the second impedance matching circuit 72 is adjusted to make the second antenna 5 work in the 2.4G WIFI frequency band and the 5G WIFI frequency band. The S21 curve and the S21' curve represent the isolation degrees of the first antenna 4 and the second antenna 5 under different schemes. The S21 and S21' parameters are negative values, the lower the curve is, the higher the absolute value of the parameter is, the higher the isolation degree of the two antennas is, and the better the decoupling effect is.

[0196] Firstly, the S21' curve is observed, the LB frequency band is taken as the first frequency band, the B41 frequency band is taken as the second frequency band, and the 2.4G WIFI frequency band is taken as the third frequency band. The B41 frequency band and the 2.4G WIFI frequency band are adjacent frequency bands, and the two bands are easy to be coupled. The first decoupling frequency band f 11 12 is the shortest frequency band range covering the B41 frequency band and the 2.4G WIFI frequency band, that is, f 11 12 is 2.4GHz-2.7GHz, and f1 is located in the range. The 5G WIFI frequency band is taken as the fifth frequency band, and the N79 frequency band and the 5G WIFI frequency band are adjacent frequency bands, and the two bands are easy to be coupled. The second decoupling frequency band f 21 22 is the shortest frequency band range covering the N79 frequency band and the 5G WIFI frequency band, that is, f 21 22 is 4.4GHz-5.835GHz, and f2 is located in the range. f2=4.9GHz and f1=2.45GHz are taken, and the values of the two frequencies are located in the corresponding decoupling frequency band, and f2=2xf1. n1=1 and n2=2 are taken, satisfying 35.3mm≤L1≤125mm. When L1 is 61mm, the response curve of the antenna module 200 produces two decoupling pits at f1=2.45GHz and f2=4.9GHz respectively, so that the first antenna 4 and the second antenna 5 have a high isolation degree. Moreover, the electromagnetic wave of the second frequency band of the first antenna 4 is in the form of a cosine wave in FIG. 18, so that the electric field at the end part is weak, thereby realizing the decoupling of the single adjacent frequency band of the first antenna 4 and the second antenna 5.

[0197] ​​​​​Based on the above decoupling scheme, the isolation between the first antenna 4 and the second antenna 5 can be further optimized to improve the decoupling effect. As shown in Figure 17, in one embodiment, the antenna system 300 further includes a second capacitor 91. One end of the second capacitor 91 is connected to the circuit between the feed point 42 of the first antenna 4 and the multiple first radio frequency modules 61, and the other end is grounded. Alternatively, it can be understood that connecting the second capacitor 91 in parallel between the first antenna 4 and the first radio frequency module 61 can further improve the isolation between the first antenna 4 and the second antenna 5, obtaining the S21 curve in Figure 19.

[0198] Specifically, observing curve S21' in Figure 19 reveals that since f2 is outside the 5G WIFI frequency band, and the curves on both sides of the decoupling pit are rising relative to this frequency point, the decoupling effect of the two antennas within the 5G WIFI frequency band is limited. Observing the S21 curve, to ensure the in-band isolation between 5G WIFI and N79, a second capacitor 91 is connected in parallel between the first antenna 4 and the first RF module 61. This causes the S21 curve on the right side of the 4.9GHz decoupling pit to show a trend of first rising and then falling within the 5G WIFI band, keeping the S21 parameter at a low value (below -15dB) within this frequency band, thus improving the decoupling effect between the 5G WIFI and N79 frequency bands. Furthermore, the value of f1 is also relatively close to the center frequency of the 2.4G WIFI frequency band, further improving the decoupling effect between the 2.4G WIFI frequency band and the B41 frequency band. On the other hand, as shown in Figure 19, the higher-order modes (redundant) of the first antenna 4... The response peak at the (mode) is weakened or even disappears. Through a combination of decoupling and optimization techniques, the radiation efficiency of the first antenna 4 and the second antenna 5 is relatively high. This can be understood as follows: to balance the decoupling effect of the two decoupling frequency bands, the value of f2 is shifted to the left, allowing the value of f1 to be closer to the center frequency of the 2.4G WIFI band. Simultaneously, to improve the decoupling effect between the 5G WIFI band and the N79 band, a second capacitor 91 is connected in parallel in the circuit, causing the S21 curve on the right side of f2 to first rise and then fall, thus expanding the decoupling bandwidth of the second decoupling frequency band.

[0199] In one embodiment, the second capacitor 91 in the above scheme can be replaced with a filter circuit, and adjusting the filter circuit can also achieve the above effect. For example, as shown in Figure 20, the second capacitor 91 in Figure 19 can be replaced with a filter circuit, such as a second filter circuit 82. The specific parameters of the capacitor and inductor in the second filter circuit 82 are not limited. In one embodiment, the filter circuit uses a combination of a 0.8pF capacitor and a 1.0nH inductor, with a series resonant frequency f. a2 At 5.5GHz, the S21 curve is at f a2 A decoupling dip also occurs at f = 5.5 GHz, f2 = 4.9 GHz and f a2Two decoupling at =5.5GHz together form a wider decoupling range, so that N79 frequency band and 5G WIFI frequency band have higher isolation, and weaken The high-order mode of the mode, the decoupling effect of the two decoupling frequency bands of the first antenna 4 and the second antenna 5 is good and the radiation efficiency is also high. It can be seen that the parallel capacitor and the parallel filter circuit can optimize the decoupling effect of the first antenna 4 and the second antenna 5, and obtain higher radiation efficiency.

[0200] In the above scheme, in the second decoupling frequency band f 21 ~f 22 There are two decoupling pits, one in front and one in back, to form a wider decoupling range covering the entire second decoupling frequency band f 21 ~f 22 , so as to achieve a better decoupling effect. The front and back positions of the two decoupling pits can be flexibly set. For example, in Figure 20, the decoupling pit at f2=4.9GHz is in front, which is designed in the N79 frequency band range. In order to ensure the decoupling effect, the other decoupling is designed to be in the back, in the 5G WIFI frequency band range, i.e. at f a2 =5.5GHz. At this time, the resonance frequency f a2 of the second filter circuit 82 is 5.5GHz, which can be directly passed through for the signal in the 5G WIFI frequency band. Therefore, the second filter circuit 82 should be designed on the circuit of the first antenna 4 to filter out the interference of the 5G WIFI frequency band in the second antenna on the N79 frequency band in the first antenna, that is, the circuit in Figure 11a is used. In other alternative embodiments, the decoupling pit at f2 can be designed in the 5G WIFI frequency band, and the decoupling pit at f a2 in the N79 frequency band. At this time, the circuit in Figure 11b can be used, and the second filter circuit 82 is set on the circuit of the second antenna 5 to filter out the interference of the N79 frequency band on the 5G WIFI frequency band. The circuits shown in Figures 12a-12d can also be used to add a first filter circuit 81 in the antenna system to expand the decoupling bandwidth of the B41 frequency band and the 2.4G WIFI frequency band.

[0201] Please refer to Figures 21a-21b, Figure 21a is an electromagnetic wave distribution schematic diagram of a third embodiment of an antenna module of the present application; Figure 21b is a response curve diagram of each antenna in the third embodiment of the antenna module of the present application.

[0202] As shown in FIGS. 21a-21b, in one embodiment, the first frequency band of the first antenna 4 is the LB frequency band, the second frequency band is the B40 frequency band, and the third frequency band of the second antenna 5 is the 2.4G WIFI frequency band. The length of the radiator 41 of the second antenna 5 is between 1 / 8 and 1 / 4 of the wavelength corresponding to 2.35 GHz, i.e., 15.96 mm≤L2≤31.9 mm. The B40 frequency band and the 2.4G WIFI frequency band are adjacent frequency bands, and the two frequency bands are prone to coupling. The first decoupling frequency band f 11 ~f 12 is the shortest frequency band range covering the B40 frequency band and the 2.4G WIFI frequency band, i.e., f 11 ~f 12 is 2.3 GHz-2.48 GHz, and f1 is located in the range. f1=2.4 GHz, n1=1, satisfies 35.3 mm≤L1≤125 mm. When L1 is 62.5 mm, the response curve of the antenna module 200 produces a decoupling pit at f1=2.4 GHz, and the electromagnetic wave of the second frequency band of the first antenna 4 is distributed in the form of a cosine wave as shown in FIG. 21a, so that the first antenna 4 and the second antenna 5 have a higher decoupling effect and a higher radiation efficiency.

[0203] Please refer to FIGS. 22a-22b, FIG. 22a is an electromagnetic wave distribution diagram of a fourth embodiment of the antenna module of the present application, and FIG. 22b is a response curve diagram of each antenna in the fourth embodiment of the antenna module of the present application.

[0204] As shown in FIGS. 22a-22b, on the basis of the above scheme, the B40 frequency band of the first antenna 4 is changed to the B41 frequency band, and the first decoupling frequency band f 11 ~f 12 is 2.4 GHz-2.7 GHz. f1=2.55 GHz, n1=1, satisfies 35.3 mm≤L1≤125 mm. When L1 is 59 mm, the response curve of the antenna module 200 produces a decoupling pit at f1=2.55 GHz, and the electromagnetic wave of the second frequency band of the first antenna 4 is distributed in the form of a cosine wave as shown in FIG. 21a, so that the first antenna 4 and the second antenna 5 have a higher decoupling effect and a higher radiation efficiency.

[0205] Please refer to FIGS. 23a-23b, FIG. 23a is an electromagnetic wave distribution diagram of a fifth embodiment of the antenna module of the present application, and FIG. 23b is a response curve diagram of each antenna in the fifth embodiment of the antenna module of the present application.

[0206] ​​As shown in FIGS. 23a-23b, in one embodiment, the first frequency band of the first antenna 4 is the LB frequency band, the second frequency band is the 2.4G WIFI frequency band, and the third frequency band of the second antenna 5 is the B41 frequency band. Different from the above scheme, the second antenna 5 is in the form of an IFA antenna, i.e., the feed point 52 of the second antenna 5 is located between the midpoint 510 of the radiator 51 and the grounding point 53. Similarly, f1=2.55 GHz, n1=1, and 35.3 mm≤L1≤125 mm is satisfied. When L1 is 59 mm, the response curve of the antenna module 200 produces a decoupling pit at f1=2.55 GHz, and the electromagnetic wave of the second frequency band of the first antenna 4 is in the form of a cosine wave, as shown in FIG. 21a, so that the first antenna 4 and the second antenna 5 have a higher decoupling effect and a higher radiation efficiency. It can be seen that the position of the feed point 52 of the second antenna 5 does not affect the decoupling effect of the two antennas.

[0207] Please refer to FIGS. 24a-24b, FIG. 24a is an electromagnetic wave distribution diagram of a sixth embodiment of an antenna module of the present application, and FIG. 24b is a response curve diagram of each antenna in the sixth embodiment of the antenna module of the present application.

[0208] As shown in FIGS. 24a-24b, in one embodiment, the first frequency band of the first antenna 4 is the LB frequency band, the second frequency band is the 2.4G WIFI frequency band, and the third frequency band of the second antenna 5 is also the 2.4G WIFI frequency band. The length of the radiator 51 of the second antenna 5 is taken to be between 1 / 8 and 1 / 4 of the wavelength corresponding to 2.45 GHz, i.e., 15.3 mm≤L2≤30.6 mm. The 2.4G WIFI frequency band and the 2.4G WIFI frequency band are the same frequency band, the first decoupling frequency band f 11 ~f 12 is the same as the 2.4G WIFI frequency band, i.e., f 11 ~f 12 is 2.4 GHz~2.48 GHz. f1=2.4 GHz, n1=1, and 35.3 mm≤L1≤125 mm is satisfied. When L1 is 59 mm, the response curve of the antenna module 200 produces a decoupling pit at f1=2.4 GHz, and the electromagnetic wave of the second frequency band of the first antenna 4 is in the form of a cosine wave, as shown in FIG. 24a, so that the first antenna 4 and the second antenna 5 have a higher decoupling effect and a higher radiation efficiency. It can be seen that the position of the feed point 52 of the second antenna 5 does not affect the decoupling effect of the two antennas. ​The first antenna 4 and the second antenna 5 have higher decoupling effect and radiation efficiency. In FIG. 24b, S21' is an isolation curve obtained by using the prior art, and S21 is an isolation curve obtained by using the present application. It can be understood that the same frequency antenna itself has a high degree of coupling and is difficult to decouple, but by comparing the S21' curve and the S21 curve, it can be seen that the present application can still greatly improve the isolation of the first antenna and the second antenna compared with the prior art, and the S21 parameter value at 2.44 GHz can still be maintained below -15 dB.

[0209] Referring to FIGS. 25a-25e, FIG. 25a is an electromagnetic wave distribution diagram of a seventh embodiment of the antenna module of the present application; FIG. 25b is a circuit diagram of the seventh embodiment of the antenna module of the present application; FIGS. 25c-25d are structural diagrams of a first capacitor in the antenna module of the present application; and FIG. 25e is a response curve diagram of each antenna in the seventh embodiment of the antenna module of the present application.

[0210] As shown in FIGS. 25a-25e, in one embodiment, the first frequency band of the first antenna 4 is the LB frequency band, the second frequency band is the N79 frequency band, the third frequency band of the second antenna 5 is the 5G WIFI frequency band, and the working frequency band of the second antenna 5 further includes the 2.4G WIFI frequency band. Among them, the N79 frequency band and the 5G WIFI frequency band need to be decoupled, the first decoupling frequency band f 11 ~ f 12 is 4.4 GHz-5.835 GHz. Taking f1=5 GHz, =60 mm, taking n1=2, L1=1xλ1=60 mm, which satisfies 35.3 mm≤L1≤125 mm. When L1 is 60 mm, the S21 curve produces a decoupling pit at 5 GHz, and the electromagnetic wave of the second frequency band is distributed in the form of one cosine wave, and the first antenna 4 and the second antenna 5 have higher isolation.

[0211] As shown in FIGS. 25b-25d, on the basis of the above, the antenna module 200 further comprises a first capacitor 45, and the first antenna 4 further comprises a first capacitor connection point 44, which is arranged at the middle of the radiator 41 of the first antenna 4 and between the ground point 43 and the feed point 42 of the first antenna 4. One end of the first capacitor 45 is connected to the first capacitor connection point 44, and the other end is grounded. The first capacitor connection point 44 can be arranged at the midpoint 410 of the radiator 41 of the first antenna 4 or at a position near the midpoint 410, which is not limited in the present application. In an embodiment, the first capacitor connection point 44 is arranged at the midpoint 410 of the radiator 41 of the first antenna 4. Those skilled in the art can understand that the first capacitor 45 can be a lumped capacitor (for example, FIG. 25d) or a distributed capacitor (for example, FIG. 25c), which is not limited in the present application.

[0212] As shown in FIG. 25e, assuming a wavelength λ3, L1 satisfies and (n3 is an integer greater than or equal to 1). The frequency corresponding to λ3 is 5 GHz times (7.5 GHz), and the S21 curve can also produce a decoupling notch at this point. The first capacitor 45 serves to move the decoupling notch originally at 7.5 GHz forward, for example, to the position of f3=5.3 GHz in FIG. 25e, while keeping the position of the decoupling notch at 5 GHz unchanged. The distance between the two decoupling notches is shortened, and both of them are located in the first decoupling frequency band, thereby widening the decoupling bandwidth of the first decoupling frequency band and further improving the decoupling effect of the first antenna 4 and the second antenna 5.

[0213] Obviously, those skilled in the art can make various modifications and variations to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalent technologies, the present application is also intended to include these modifications and variations.

Claims

1. An antenna module, characterized in that, It includes a first antenna and a second antenna. Each of the first antenna and the second antenna includes a radiator and a feed point and a ground point spaced apart on the radiator. The radiator is grounded through the corresponding ground point and transmits radio frequency signals through the corresponding feed point. The first end of the radiator of the first antenna and the first end of the radiator of the second antenna are close to each other and spaced apart, and the second end of the radiator of the first antenna and the second end of the radiator of the second antenna are far apart and away from each other; in the first antenna and the second antenna, the grounding point of each antenna is located at the second end of its respective radiator, and the feed point of each antenna is located at the first end of its respective radiator or between the first end and the second end. The first antenna operates in a frequency band including a first frequency band and a second frequency band, and the second antenna operates in a frequency band including a third frequency band. The first frequency band is generally lower than the second frequency band and the third frequency band, and the second frequency band is adjacent to, partially overlaps with, or completely overlaps with the third frequency band. The length of the radiating element of the first antenna is L1. n1 is an integer greater than or equal to 1, and λ1 is the wavelength of the electromagnetic wave with frequency f1 in the working environment. Frequency f1 is located within the first decoupling frequency band of the antenna module, and the first decoupling frequency band is f1. 11 ~f 12 f 11 f is the lowest frequency in the second and third frequency bands. 12 It is the highest frequency in the second frequency band and the third frequency band.

2. The antenna module as described in claim 1, characterized in that, The first antenna's operating frequency band also includes a fourth frequency band, and the second antenna's operating frequency band also includes a fifth frequency band. The first frequency band is generally lower than the fourth and fifth frequency bands, and the fourth and fifth frequency bands are adjacent, partially overlapping, or completely overlapping. n2 is an integer greater than or equal to 1 and is different from n1. λ2 is the wavelength of the electromagnetic wave with frequency f2 in the working environment. Frequency f2 is located within the second decoupling frequency band of the antenna module. The second decoupling frequency band is f2. 21 ~f 22 f 21 f is the lowest frequency in the fourth and fifth frequency bands. 22 The second decoupling frequency band is the highest frequency among the fourth and fifth frequency bands; the second decoupling frequency band does not overlap with the first decoupling frequency band.

3. The antenna module as described in claim 1 or 2, characterized in that, The antenna module further includes a first capacitor, and the first antenna further includes a first capacitor connection point. The first capacitor connection point is located in the middle of the radiator of the first antenna and between the grounding point and the feed point of the first antenna. One end of the first capacitor is connected to the first capacitor connection point, and the other end is grounded.

4. The antenna module as described in claim 3, characterized in that, The first capacitor connection point is located at the midpoint of the radiating element of the first antenna; And / or, the first capacitor is a lumped capacitor or a distributed capacitor.

5. The antenna module as described in any one of claims 1 to 4, characterized in that, When the feed point of the first antenna is located between the first end and the second end of the radiator of the first antenna, the feed point of the first antenna is located between the first end and the midpoint of its radiator.

6. The antenna module as described in any one of claims 1 to 5, characterized in that: λ 01 / 8≤L1≤λ 01 / 4, where λ 01 The wavelength is the wavelength corresponding to any frequency within the first reference frequency band. The lowest frequency of the first reference frequency band is lower than the lowest frequency of the first frequency band by a first preset threshold, and the highest frequency of the first reference frequency band is higher than the highest frequency of the first frequency band by a second preset threshold. λ 02 / 8≤L2≤λ 02 / 4, where L2 is the length of the radiating element of the second antenna, λ 02 The wavelength is the wavelength corresponding to any frequency within the second reference frequency band. The lowest frequency of the second reference frequency band is lower than the lowest frequency of the lowest operating frequency band in the second antenna by a third preset threshold, and the highest frequency of the second reference frequency band is higher than the highest frequency of the lowest operating frequency band in the two antennas by a fourth preset threshold.

7. The antenna module according to any one of claims 1 to 6, characterized in that, The gap between the first end of the radiator of the first antenna and the first end of the radiator of the second antenna is s, where 1mm≤s≤3mm.

8. The antenna module according to any one of claims 1 to 7, characterized in that, Each radiator in the first antenna and the second antenna is a branch or a gap.

9. The antenna module according to any one of claims 1 to 8, characterized in that, The first frequency band ranges from 0.7 GHz to 0.96 GHz; and, The second frequency band ranges from 2.3 GHz to 2.4 GHz, or 2.5 GHz to 2.7 GHz, or 2.4 MHz to 2.4 GHz, and the third frequency band ranges from 2.4 GHz to 2.48 GHz. Alternatively, the second frequency band may range from 4.4 GHz to 5.0 GHz, and the third frequency band may range from 5.17 GHz to 5.835 GHz.

10. The antenna module as described in claim 9, characterized in that, When the first antenna operates in a frequency band including a fourth frequency band, and the second antenna operates in a frequency band including a fifth frequency band, with the second frequency band ranging from 2.3 GHz to 2.4 GHz, 2.5 GHz to 2.7 GHz, or 2.4 GHz to 2.48 GHz, and the third frequency band ranging from 2.4 GHz to 2.48 GHz, then the fourth frequency band ranges from 4.4 GHz to 5.0 GHz, and the fifth frequency band ranges from 5.17 GHz to 5.835 GHz. When the first antenna operates in a frequency band including a fourth frequency band, and the second antenna operates in a frequency band including a fifth frequency band, with the second frequency band ranging from 4.4 GHz to 5.0 GHz, the third frequency band ranging from 5.17 GHz to 5.835 GHz, the fourth frequency band ranging from 2.3 GHz to 2.4 GHz, 2.5 GHz to 2.7 GHz, or 2.4 GHz to 2.48 GHz, and the fifth frequency band ranging from 2.4 GHz to 2.48 GHz, 11. The antenna module as described in any one of claims 1 to 10, characterized in that, The center frequency of the second frequency band is f 1mid The center frequency of the third frequency band is f. 2mid , When the operating frequency band of the first antenna includes the fourth frequency band and the operating frequency band of the second antenna includes the fifth frequency band, the center frequency of the fourth frequency band is f. 4mid The center frequency of the fifth frequency is f. 5mid , 12. An antenna system, characterized in that, It includes a first radio frequency module, a second radio frequency module, and an antenna module as described in any one of claims 1 to 11, wherein the first radio frequency module is used to transmit radio frequency signals to the feed point of the first antenna, and the second radio frequency module is used to transmit radio frequency signals to the feed point of the second antenna.

13. The antenna system as claimed in claim 12, characterized in that, The antenna system also includes a second capacitor, one end of which is connected to the circuit between the feed point of the first antenna and the first radio frequency module, and the other end is grounded.

14. The antenna system as claimed in claim 12, characterized in that, When the second frequency band is adjacent to the third frequency band, the antenna system further includes a first filter circuit; wherein, The frequency f1 is located within the second frequency band of the first antenna. One end of the first filter circuit is connected to the circuit between the feed point of the first antenna and the first RF module, and the other end is grounded, to filter out signals in the third frequency band of the second antenna; or, The frequency f1 is located within the third frequency band of the second antenna. One end of the first filter circuit is connected to the circuit between the feed point of the second antenna and the second radio frequency module, and the other end is grounded, so as to filter out the signal under the second frequency band of the first antenna.

15. The antenna system as described in claim 12 or 14, characterized in that, When the first antenna's operating frequency band further includes a fourth frequency band, and the second antenna's operating frequency band further includes a fifth frequency band, and the fourth and fifth frequency bands are adjacent, the antenna system further includes a second filter circuit; wherein... The frequency f2 is located within the fourth frequency band of the first antenna. One end of the second filter circuit is connected to the circuit between the feed point of the first antenna and the first RF module, and the other end is grounded, to filter out signals in the fifth frequency band of the second antenna; or, The frequency f2 is located in the fifth frequency band of the second antenna. One end of the second filter circuit is connected to the circuit between the feed point of the second antenna and the second radio frequency module, and the other end is grounded, so as to filter out the signal in the fourth frequency band of the first antenna.

16. The antenna system as described in claim 14 or 15, characterized in that, When the antenna system includes a first filter circuit, the first filter circuit includes a third capacitor and a first inductor connected in series; wherein the series resonant frequency of the series resonant circuit formed by the third capacitor and the first inductor is located within the third frequency band of the second antenna, so as to filter out signals under the third frequency band of the second antenna; or, the series resonant frequency of the series resonant circuit formed by the third capacitor and the first inductor is located within the second frequency band of the first antenna, so as to filter out signals under the second frequency band of the first antenna. When the operating frequency band of the first antenna further includes a fourth frequency band, the operating frequency band of the second antenna further includes a fifth frequency band, and the antenna system includes a second filter circuit, the second filter circuit includes a fourth capacitor and a second inductor connected in series; wherein, the series resonant frequency of the series resonant circuit formed by the fourth capacitor and the second inductor is located within the fifth frequency band of the second antenna, so as to filter out signals under the fifth frequency band of the second antenna, or, the series resonant frequency of the series resonant circuit formed by the fourth capacitor and the second inductor is located within the fourth frequency band of the first antenna, so as to filter out signals under the fourth frequency band of the first antenna.

17. The antenna system as described in any one of claims 12 to 16, characterized in that, The antenna system also includes: A first impedance matching circuit is disposed on the circuit between the feed point of the first radio frequency module and the first antenna.

18. The antenna system as claimed in claim 17, characterized in that, The first impedance matching circuit includes a fifth capacitor, a sixth capacitor, and a third inductor. The fifth capacitor and the third inductor are connected in series between the feed point of the first RF module and the first antenna. One end of the sixth capacitor is connected between the third inductor and the first RF module, and the other end is grounded.

19. An electronic device, characterized in that, Including the antenna system as described in any one of claims 12 to 18.

20. The electronic device as claimed in claim 19, characterized in that, The electronic device is a foldable electronic device, including a first display screen, a second display screen, and a housing assembly. The housing assembly includes a first housing, a second housing, and a hinge device. The first housing and the second housing are rotatably connected through the hinge device. The first display screen is laid on one side of the housing assembly and includes a first part, a second part, and a foldable part. The first part is fixedly connected to the first housing, the second part is fixedly connected to the second housing, and the foldable part is correspondingly arranged with the hinge device. The second display screen is fixedly connected to the first housing and is arranged opposite to the first part of the first display screen in the thickness direction of the first housing. The radiators of the first antenna and the second antenna are formed by the outer frame of the first housing; Alternatively, the radiators of the first antenna and the second antenna may be patch structures, which are attached to the surface of the outer frame of the first housing.

21. The electronic device as claimed in claim 20, characterized in that, The electronic device further includes a floor, which is spaced apart from the radiators of the first antenna and the second antenna. The radiators of each antenna in the first antenna and the second antenna are connected to the floor through corresponding grounding points to be grounded.

22. The electronic device as claimed in claim 20 or 21, characterized in that, The electronic device also includes a circuit board, which is mounted inside the first housing; The first radio frequency module and the second radio frequency module of the antenna system are disposed on the circuit board.

23. The electronic device according to any one of claims 20 to 22, characterized in that, The radiators of the first antenna and the second antenna are located on the same edge of the first housing.

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