Antenna assembly, middle frame assembly and electronic device

Abstract

The present application discloses an antenna assembly, a middle frame assembly and an electronic device, and relates to the field of communication technology. In the antenna assembly, the first radiator has a first free end, a second free end, a first feeding point between the first free end and the second free end, and an isolation point between the first feeding point and the first free end, the first feeding point receives a first excitation signal, the first free end is grounded, the second radiator has a third free end spaced apart from the first free end and a second feeding point receiving a second excitation signal; the isolation circuit is connected to the isolation point, and the isolation circuit is in a low impedance state under the working frequency band of the first excitation signal. The present application adjusts the isolation circuit so that the first excitation signal can work between the second free end and the isolation point, and then improves the isolation between the first radiator and the second radiator through the distance between the first free end and the isolation point, and further improves the antenna performance of the antenna assembly.

Description

Technical Field

[0001] The present application relates to the field of communication technology, and in particular to an antenna assembly, a middle frame assembly and an electronic device. Background Art

[0002] The antenna assembly in the electronic device is usually provided with at least two radiators. When the distance between the two radiators becomes smaller, the isolation between the two radiators when operating in the same or adjacent frequency bands will also become smaller, thereby affecting the antenna performance of the antenna assembly. Summary of the invention

[0003] The technical problem to be solved by the present application is to provide an antenna assembly, comprising:

[0004] A first radiator, comprising a first free end, a second free end, a first feeding point between the first free end and the second free end, and an isolation point between the first feeding point and the first free end, wherein the first feeding point is used to receive a first excitation signal, and the first free end is grounded;

[0005] a second radiator having a third free end spaced apart from the first free end and a second feeding point for receiving a second excitation signal; and

[0006] An isolation circuit is connected to the isolation point, and the isolation circuit is configured to be in a low impedance state in an operating frequency band of the first excitation signal.

[0007] The technical problem to be solved by the present application is to provide a middle frame assembly, including:

[0008] substrate;

[0009] a frame connected to the substrate and arranged around the substrate; and

[0010] As described above for the antenna assembly, the first radiator and the second radiator are disposed on the frame.

[0011] The technical problem to be solved by the present application is to provide an electronic device, characterized in that it includes:

[0012] Middle frame, including:

[0013] substrate;

[0014] a frame connected to the substrate, comprising a first frame, a second frame, a third frame and a fourth frame which are sequentially connected end to end and are arranged around the substrate, the first frame and the third frame are arranged opposite to each other, the second frame and the fourth frame are arranged opposite to each other, and the lengths of the first frame and the third frame are both shorter than the length of the second frame and shorter than the length of the fourth frame;

[0015] As described above, in the antenna assembly, the first radiator is disposed on the first frame, and the second radiator is disposed at least on the first frame and is located on a side of the first radiator away from the fourth frame;

[0016] a battery cover, which is disposed on one side of the middle frame assembly and is respectively connected to the first frame, the second frame, the third frame and the fourth frame, and is disposed opposite to the substrate, the battery cover is provided with a camera metal decorative piece, the camera metal decorative piece is located at a portion where the battery cover is connected to the first frame, and its orthographic projection on the first frame is located on a side of the first radiator away from the second radiator; and

[0017] The display screen is arranged on the other side of the middle frame assembly, and is respectively connected to the first frame, the second frame, the third frame and the fourth frame, and is arranged opposite to the substrate.

[0018] The technical solution described in the present application has the following beneficial effects: the present application sets an isolation point between the first feeding point and the first free end to connect the isolation circuit, and adjusts the isolation circuit so that the first excitation signal can work between the second free end and the isolation point, thereby improving the isolation between the first radiator and the second radiator through the distance between the first free end and the isolation point, thereby further improving the antenna performance of the antenna assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the implementation modes of the present application, the drawings required for use in the description of the implementation modes will be briefly introduced below. Obviously, the drawings described below are only some implementation modes of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 This is a schematic diagram of the structure of an antenna assembly in one embodiment of the present application;

[0021] Figure 2 for Figure 1 A schematic structural diagram of the antenna assembly in another embodiment;

[0022] Figure 3 for Figure 1 A schematic structural diagram of the antenna assembly in another embodiment;

[0023] Figure 4 for Figure 1 A schematic structural diagram of the antenna assembly in another embodiment;

[0024] Figure 5 In one embodiment Figure 1 The antenna components in Figure 2 Comparison of return loss of the two antenna components in Figure 1;

[0025] Figure 6 In one embodiment Figure 1 The antenna components in Figure 2 Comparison of return loss of the two antenna components in Figure 1;

[0026] Figure 7 In one embodiment Figure 1 A return loss curve diagram of the first radiator 10 in the first resonance mode L1;

[0027] Figure 8 In one embodiment Figure 1 The antenna components in Figure 2 A comparison chart of the total system efficiency of the two antenna components;

[0028] Fig. 9 for Figure 1 A schematic structural diagram of the antenna assembly in another embodiment;

[0029] Fig.10 An exploded view of an electronic device in one embodiment of the present application;

[0030] Fig.11 for Fig.10 A rear view of the electronic device in the illustrated embodiment;

[0031] Fig.12 for Fig.10 A schematic diagram of the structure of the frame assembly in the illustrated embodiment;

[0032] Fig.13 for Fig.10 A schematic diagram of the structure of the frame assembly in the illustrated embodiment in another embodiment;

[0033] Fig.14 Schematic diagram of the structure of an electronic device in one embodiment of the present application. DETAILED DESCRIPTION

[0034] The present application is further described in detail below in conjunction with the accompanying drawings and implementation methods. It is particularly noted that the following implementation methods are only used to illustrate the present application, but do not limit the scope of the present application. Similarly, the following implementation methods are only some implementation methods of the present application rather than all implementation methods. All other implementation methods obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0035] Reference to "embodiment" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0036] The present application provides an antenna assembly. The antenna assembly can be used in electronic devices. The antenna assembly can support at least one of the GPS (Global Positioning System) frequency band, the WiFi (Wireless-Fidelity) frequency band, the medium-high frequency band, and the NR (New Radio) frequency band. In the antenna assembly, the isolation between the two radiators can be adjusted by an isolation circuit, so that the operating frequency bands of the two radiators are better isolated, thereby improving the antenna performance of the antenna assembly.

[0037] As used herein, "electronic devices" (which may also be referred to as "terminals" or "mobile terminals" or "electronic devices") include, but are not limited to, devices that are configured to receive / send communication signals via a wireline connection (such as via a public switched telephone network (PSTN), a digital subscriber line (DSL), digital cable, a direct cable connection, and / or another data connection / network) and / or via a wireless interface (e.g., for a cellular network, a wireless local area network (WLAN), a digital television network such as a DVB-H network, a satellite network, an AM-FM broadcast transmitter, and / or another communication terminal). Communication terminals that are configured to communicate via a wireless interface may be referred to as "wireless communication terminals", "wireless terminals" or "mobile terminals". Examples of mobile terminals include, but are not limited to, satellite or cellular phones; personal communication system (PCS) terminals that may combine cellular radiotelephones with data processing, fax, and data communication capabilities; PDAs that may include radiotelephones, pagers, Internet / Intranet access, web browsers, notepads, calendars, and / or global positioning system (GPS) receivers; and conventional laptop and / or palmtop receivers or other electronic devices that include radiotelephone transceivers. A mobile phone is an electronic device equipped with a cellular communication module.

[0038] See also Figure 1 , Figure 1Schematic diagram of the structure of the antenna assembly 100 in an embodiment of the present application. The antenna assembly 100 can be a mixture of one or more of a flexible printed circuit (FPC) antenna, a laser direct structuring (LDS) antenna, a print direct structuring (PDS) antenna, and a metal frame antenna. Of course, the antenna assembly 100 can also be other types of antennas, which will not be described in detail. The present application embodiment takes a metal frame antenna as an example for introduction.

[0039] The antenna assembly 100 may include a first radiator 10 and a second radiator 20 spaced apart from the first radiator 10. The first radiator 10 and the second radiator 20 may operate at their respective operating frequency bands. In some embodiments, the first radiator 10 and the second radiator 20 have good isolation and do not affect each other.

[0040] The terms "first", "second", "third", etc. in this application are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, a feature defined as "first", "second", "third", etc. may explicitly or implicitly include at least one of the features.

[0041] See also Figure 1 The first radiator 10 has a first free end 11 close to the second radiator 20 and a second free end 12 away from the second radiator 20. That is, the first free end 11 and the second free end 12 may be opposite ends of the first radiator 10, and the first radiator 10 is spaced apart from the second radiator 20 at the first free end 11.

[0042] In some embodiments, the first free end 11 may be grounded to improve the effect of isolating the first radiator 10 from the second radiator 20. Furthermore, the first free end 11 may also be referred to as a “grounding point”.

[0043] The first free end 11 is spaced apart from the second radiator 20 , that is, a gap is provided between the first free end 11 and the second radiator 20 .

[0044] The second free end 12 is located at a side of the first free end 11 away from the second radiator 20 .

[0045] The first radiator 10 has a first feeding point 13 located between the first free end 11 and the second free end 12 for receiving a first excitation signal so that the first excitation signal excites the first radiator 10 .

[0046] In some embodiments, the first feed point 13 may be connected to the first matching circuit 14, and the first matching circuit 14 may be connected to the first feed source 15. It can be understood that the first matching circuit 14 and the first feed source 15 may also be part of the antenna assembly 100.

[0047] The first matching circuit 14 can support the GPS frequency band and / or WiFi frequency band of the antenna assembly 100. The first matching circuit 14 may include a switch control unit and / or a load circuit, or an adjustable capacitor and / or an adjustable inductor, or an adjustable capacitor and / or a switch control unit. In one embodiment, the switch control unit may be a switch chip with a switch function, or a single-pole multi-throw switch or a single-pole single-throw switch. In some embodiments, the first matching circuit 14 may be omitted, and the first feeding point 13 may be connected to the first feed source 15.

[0048] The first feed source 15 can be used to generate a first excitation signal to excite the first radiator 10 to generate a resonance mode supporting the GPS frequency band and / or the WiFi frequency band. The first excitation signal can flow to the first radiator 10 through the first matching circuit 14 .

[0049] The first radiator 10 has an isolation point 16 located between the first feeding point 13 and the first free end 11, and the isolation point 16 is connected to the isolation circuit 17, so that the isolation between the first radiator 10 and the second radiator 20 is improved by setting the isolation point 16 and adjusting the isolation circuit 17. It can be understood that the isolation circuit 17 can be a part of the antenna assembly 100.

[0050] The isolation circuit 17 can be in a low impedance state in the first frequency band supported by the antenna assembly 100, so as to improve the isolation between the first radiator 10 and the second radiator 20 by increasing the length A1 of the isolation ground between the isolation point 16 and the first free end 11. That is, the first free end 11 is grounded through a grounding member 111 (such as a wire, a conductive device, etc.). In addition, when the isolation circuit 17 is in a low impedance state, the isolation circuit 17 can form an equivalent grounding path of the first excitation signal together with the grounding member 111. In the direction parallel to the first radiator 10, the width of the equivalent grounding path is the length A1 of the isolation ground between the isolation point 16 and the first free end 11, and the equivalent grounding path can improve the isolation between the first radiator 10 and the second radiator 20.

[0051] Please also read Figure 1 and Figure 2 , Figure 2 for Figure 1 FIG. 1 is a schematic diagram of the structure of the antenna assembly 100 in another embodiment. Figure 2 The antenna assembly 100 is not provided Figure 1 The isolation point 16 and the isolation circuit 17, Figure 1 The first radiator 10 and Figure 2 When the first radiators 10 in the embodiment are all in the first frequency band, Figure 1 The length A1 of the isolation ground between the middle isolation point 16 and the first free end 11, Figure 2 The length A2 of the isolation ground at the first free end 11 is greater than A2. It can be seen that the setting of the isolation point 16 and the isolation circuit 17 increases the length of the isolation ground between the first radiator 10 and the second radiator 20 in the first frequency band, thereby improving the isolation between the first radiator 10 and the second radiator 20 in the first frequency band.

[0052] Understandably, Figure 2 The length A2 of the isolation ground at the first free end 11 is the width of the grounding piece 111 in a direction parallel to the first radiator 10, and in the direction parallel to the first radiator 10, the width of the equivalent grounding path (i.e., the length A1 of the isolation ground between the isolation point 16 and the first free end 11) is greater than the width of the grounding piece (i.e., the length A2 of the isolation ground).

[0053] In addition, the isolation between the first radiator 10 and the second radiator 20 in the first frequency band can be adjusted by adjusting the length A1. Figure 1 The isolation effect between the first radiator 10 and the second radiator 20 is further improved. The isolation degree between the first radiator 10 and the second radiator 20 in other frequency bands can also be achieved by adjusting the isolation circuit 17, which will not be described in detail here.

[0054] In some embodiments, the isolation circuit 17 may include a switch control unit and / or an adjustable capacitor and / or an adjustable inductor. In some embodiments, the adjustable capacitor in the isolation circuit 17 may be replaced with a fixed value capacitor. In some embodiments, the adjustable inductor in the isolation circuit 17 may be replaced with a fixed value inductor. In one embodiment, the switch control unit may be a switch chip with a switch function, or may be a single-pole multi-throw switch or a single-pole single-throw switch.

[0055] In some embodiments, see Figure 3 , Figure 3 for Figure 1 The antenna assembly 100 is shown in another embodiment. The isolation circuit 17 may include a first capacitor C1 having one end connected to the isolation point 16, a second capacitor C2 having one end connected to the other end of the first capacitor C1 and the other end grounded, and a first inductor L1 having one end connected to the other end of the first capacitor C1 and the other end grounded.

[0056] In some embodiments, the capacitance of the first capacitor C1 may be 7.3 pF.

[0057] In some embodiments, the capacitance of the second capacitor C2 may be 4.6 pF.

[0058] In some embodiments, the inductance of the first inductor L1 may be 2.4 nH.

[0059] See also Figure 4 , Figure 4 for Figure 1 The schematic diagram of the structure of the antenna assembly 100 in another embodiment is shown. The first frequency band may be part or all of the WiFi frequency band. The first excitation signal may be used to excite the first radiator 10 to generate a first resonance mode L1 supporting the first frequency band. The first resonance mode L1 is a 1 / 4 wavelength mode from the second free end 12 to the isolation point 16. The isolation circuit 17 may be configured to be in a low impedance state in the first resonance mode L1 so as to improve the isolation between the first radiator 10 and the second radiator 20 in the first resonance mode L1.

[0060] In one embodiment, the isolation circuit 17 may be configured to be in a short-circuit state in the first resonance mode L1 .

[0061] In one embodiment, the first frequency band may include a WiFi 2.4G frequency band.

[0062] In one embodiment, the first excitation signal can be used to excite the first radiator 10 to generate a second resonance mode L2 supporting the GPS frequency band. The second resonance mode L2 is a 1 / 4 wavelength mode from the second free end 12 to the first free end 11. In some embodiments, the isolation between the first radiator 10 and the second radiator 20 in the second resonance mode L2 meets the requirements of the antenna assembly 100, and thus, the isolation circuit 17 can be configured to be in a high impedance state in the second resonance mode L2.

[0063] In one embodiment, the isolation circuit 17 may be configured to be in an open circuit state in the GPS frequency band.

[0064] In one embodiment, the first excitation signal can be used to excite the first radiator 10 to generate a third resonance mode L3 supporting the second frequency band in the WiFi frequency band. The third resonance mode L3 is a 3 / 4 wavelength mode from the second free end 12 to the first free end 11. In some embodiments, the isolation between the first radiator 10 and the second radiator 20 in the third resonance mode L3 meets the requirements of the antenna assembly 100, and then, the isolation circuit 17 can be configured to be in a high impedance state in the third resonance mode L3. It can be understood that the second frequency band is different from the first frequency band.

[0065] In one embodiment, the second frequency band may include a WiFi 5G frequency band.

[0066] In one embodiment, the isolation circuit 17 may be configured to be in an open circuit state in the third resonance mode L3 .

[0067] In one embodiment, the first excitation signal can be used to excite the first radiator 10 to generate a fourth resonance mode L4 supporting a third frequency band in the WiFi frequency band. The fourth resonance mode L4 is a 1 / 4 wavelength mode from the second free end 12 to the first feeding point 13 .

[0068] In one embodiment, the third frequency band may include a WiFi 5G frequency band.

[0069] See also Figure 1 , Figure 2 , Figure 3 and Figure 4 The second radiator 20 has a third free end 21 close to the first radiator 10 and a fourth free end 22 away from the first radiator 10. That is, the third free end 21 and the fourth free end 22 can be opposite ends of the second radiator 20.

[0070] The second radiator 20 is spaced apart from the first radiator 10 at the third free end 21 .

[0071] The third free end 21 is spaced apart from the first radiator 10 , that is, a gap is provided between the third free end 21 and the first radiator 10 , for example, the first free end 11 .

[0072] The fourth free end 22 may be grounded, and thus the fourth free end 22 may also be referred to as a “grounding point.” In some embodiments, the fourth free end 22 may not be grounded. In some embodiments, the second radiator 20 may be grounded at a location other than the fourth free end 22 .

[0073] The fourth free end 22 is located at a side of the third free end 21 away from the first radiator 10 .

[0074] The second radiator 20 has a second feeding point 23 located between the third free end 21 and the fourth free end 22 for receiving the second excitation signal so that the second excitation signal excites the second radiator 20 .

[0075] In some embodiments, the second feed point 23 may be connected to the second matching circuit 24, and the second matching circuit 24 may be connected to the second feed source 25. It can be understood that the second matching circuit 24 and the second feed source 25 may also be part of the antenna assembly 100.

[0076] The second matching circuit 24 can support the medium and high frequency bands and / or the NR band of the antenna assembly 100. The second matching circuit 24 may include a switch control unit and / or a load circuit, or an adjustable capacitor and / or an adjustable inductor, or an adjustable capacitor and / or a switch control unit. In one embodiment, the switch control unit may be a switch chip with a switch function, or a single-pole multi-throw switch or a single-pole single-throw switch. In some embodiments, the second matching circuit 24 may be omitted, and the second feeding point 23 may be connected to the second feed source 25.

[0077] The second feed source 25 can be used to generate a second excitation signal to excite the second radiator 20 to generate a resonance mode supporting the mid-high frequency band and / or the NR band. The second excitation signal can flow to the second radiator 20 through the second matching circuit 24 .

[0078] In one embodiment, the second excitation signal can excite the second radiator 20 to generate a fifth resonance mode supporting a fourth frequency band in the mid-high frequency band.

[0079] See also Figure 4 In the antenna assembly 100 , the isolation circuit 17 may be configured to adjust the isolation between the first radiator 10 in the first resonance mode L1 and the second radiator 20 in the fifth resonance mode.

[0080] In some embodiments, the fourth frequency band includes LTE (Long Term Evolution) B40 and / or LTE B41 frequency band. It can be understood that when the first frequency band includes the WiFi2.4G frequency band, the fourth frequency band LTE B40 or LTE B41 frequency band is relatively close to the WiFi2.4G frequency band, and thus the isolation circuit 17 needs to be used to adjust the isolation between the first radiator 10 in the first resonance mode L1 and the second radiator 20 in the fifth resonance mode to improve the antenna performance of the antenna assembly 100.

[0081] See also Figure 5 , Figure 5 In one embodiment Figure 1 The antenna assembly 100 and Figure 2 The horizontal axis is the frequency (GHz), the vertical axis is the return loss (dB), and the curve B1 is Figure 1 The return loss curve of the antenna assembly 100 in FIG. 1 is shown in FIG. Figure 2 The return loss curve of the antenna assembly 100 in FIG. When the first radiator 10 works in the WiFi 2.4G frequency band and the second radiator 20 works in the LTE B40 frequency band, there is a point a (2.3963, -8.9101) on the curve C1 and a point b (2.4083, -10.611) on the curve B1, where -8.9101dB - (-10.611dB) = 1.7009dB. It can be seen that the setting of the isolation point 16 and the isolation circuit 17 virtually increases the isolation between the first radiator 10 and the second radiator 20, which can roughly increase the isolation between the first radiator 10 and the second radiator 20 by 1.7dB.

[0082] See also Figure 6 , Figure 6 In one embodiment Figure 1The antenna assembly 100 and Figure 2 The horizontal axis is the frequency (GHz), the vertical axis is the return loss (dB), and the curve B2 is Figure 1 The return loss curve of the antenna assembly 100 in FIG. 1 is shown in FIG. Figure 2 The return loss curve of the antenna assembly 100 in FIG. When the first radiator 10 works in the WiFi 2.4G frequency band and the second radiator 20 works in the LTE B41 frequency band, there is a point c (2.4764, -8.9713) on the curve C2 and a point b (2.5207, -9.9329) on the curve B2, where -8.9713dB - (-9.9329dB) = 0.9616dB. It can be seen that the setting of the isolation point 16 and the isolation circuit 17 virtually increases the isolation between the first radiator 10 and the second radiator 20, which can roughly increase the isolation between the first radiator 10 and the second radiator 20 by 1dB.

[0083] See also Figure 7 , Figure 7 In one embodiment Figure 1 The return loss curve of the first radiator 10 in the first resonance mode L1 is shown in FIG. The horizontal axis is the frequency (GHz), the vertical axis is the return loss (dB), and the curve B3 is Figure 1 The return loss curve of the first radiator 10 in the first resonance mode L1. Among them, the curve B3 has a point e (1.5469, -0.77979) corresponding to the GPS frequency band, and the curve B3 has a point f (2.895, -19.165) corresponding to the WiFi frequency band. As the return loss in point e approaches 0, it can be seen that the isolation circuit 17 is configured in a high impedance state in the GPS frequency band. As the return loss in point f is -19.165dB, it can be seen that the isolation circuit 17 is configured in a low impedance state in the WiFi frequency band.

[0084] See also Figure 8 , Figure 8 In one embodiment Figure 1 The antenna assembly 100 and Figure 2 The comparison chart of the system total efficiency (System Total Efficiency, System Total Efficiency = System Radiation Efficiency - Return Loss) of the antenna assembly 100 in FIG. The horizontal axis is frequency (GHz), the vertical axis is system total efficiency (dB), and curve B4 is Figure 1 The total system efficiency of the second radiator 20 in the curve C3 is Figure 2 The total system efficiency of the second radiator 20 in the curve B5 is Figure 1 The total system efficiency of the first radiator 10 in the curve C4 is Figure 2In curves B4 and C3, it can be seen that the system radiation efficiency and bandwidth of the second radiator 20 in the LTE B40 frequency band are significantly improved. In curves B5 and C4, it can be seen that the system radiation efficiency and bandwidth of the first radiator 10 in the GPS frequency band and the WiFi frequency band are significantly improved.

[0085] See also Fig. 9 , Fig. 9 for Figure 1 The schematic diagram of the structure of the antenna assembly 100 in another embodiment is shown. In order to detect the BodySAR (Body Specific Absorb Rate) of the antenna assembly 100, the antenna assembly 100 may include a human electromagnetic wave absorption detection circuit 30 connected to the isolation point 16, so that the first radiator 10 is used as a human electromagnetic wave absorption detection sensor, and the human electromagnetic wave absorption detection circuit 30 cooperates with the first radiator 10 to realize the detection of the human electromagnetic wave absorption rate of the antenna assembly 100. In some embodiments, the human electromagnetic wave absorption detection circuit 30 may include a second inductor L2 connected to the isolation point 16 at one end and a control circuit 31 connected to the other end of the second inductor L2. The control circuit 31 may receive a signal generated by the antenna assembly 100 being affected by the human body, and may process the signal to generate a detection result. In some embodiments, the control circuit 31 may be a control circuit on an electronic device, such as a circuit mainboard. In some embodiments, the control circuit 31 may control at least one of the first feed source 15, the first matching circuit 14, and the isolation circuit 17 according to the detection result to adjust the resonance mode of the first radiator 10 to support the GPS frequency band and / or the WiFi frequency band. In some embodiments, the second inductor L2 can reduce the influence of the GPS frequency band and / or the WiFi frequency band of the human body electromagnetic wave absorption detection circuit 30 and the first radiator 10. In some embodiments, the inductance of the second inductor L2 can be 68nH.

[0086] In some embodiments, in order to reduce the influence of the first feed source 15, the first matching circuit 14, the isolation circuit 17 and the ground on the accuracy of the human body electromagnetic wave absorption rate detection results of the antenna assembly 100, the antenna assembly 100 may also include a third capacitor C3 connected to the first feeding point 13, a fourth capacitor C4 arranged between the isolation point 16 and the isolation circuit 17, and a fifth capacitor C5 having one end connected to the first free end 11 and the other end connected to the ground.

[0087] The third capacitor C3 is arranged between the first feeding point 13 and the first matching circuit 14, that is, the first feeding point 13, the third capacitor C3, the first matching circuit 14 and the first feed source 15 are connected in series in sequence. Then, the isolation of the human body electromagnetic wave absorption detection sensor is achieved through the third capacitor C3. In some embodiments, when the first matching circuit 14 is omitted, the first feeding point 13, the third capacitor C3 and the first feed source 15 are connected in series in sequence.

[0088] The fourth capacitor C4 is arranged between the isolation point 16 and the isolation circuit 17, that is, the isolation point 16, the fourth capacitor C4 and the isolation circuit 17 are connected in series in sequence. Then, the isolation of the human body electromagnetic wave absorption detection sensor is realized by the fourth capacitor C4. In some embodiments, the isolation circuit 17 has a capacitor directly connected to the isolation point 16, such as the first capacitor C1, and then the fourth capacitor C4 can be omitted. It can be understood that in some embodiments, the fourth capacitor C4 can be retained, and the capacitor in the isolation circuit 17, such as the first capacitor C1, can be omitted.

[0089] The fifth capacitor C5 is arranged between the first free end 11 and the ground, that is, the first free end 11, the fifth capacitor C5 and the ground are connected in series in sequence. Then, the fifth capacitor C5 is used to isolate the human body electromagnetic wave absorption detection sensor. In some embodiments, in order not to change the boundary conditions of the first radiator 10, the capacitance of the fifth capacitor C5 can be 22pF or 33pF.

[0090] Next, an electronic device is described, which can be equipped with the antenna assembly 100 in the above embodiment. The electronic device can be any one of a plurality of electronic devices, including but not limited to cellular phones, smart phones, other wireless communication devices, personal digital assistants, audio players, other media players, music recorders, video recorders, cameras, other media recorders, radios, medical devices, calculators, programmable remote controls, pagers, netbook computers, personal digital assistants (PDAs), portable multimedia players (PMPs), moving picture experts group (MPEG-1 or MPEG-2), audio layer 3 (MP3) players, portable medical devices, digital cameras, and combinations thereof.

[0091] In some embodiments, the electronic device may include but is not limited to a mobile phone, a mobile internet device (MID), an e-book, a portable play station (PlayStation Portable, PSP) or a personal digital assistant (Personal Digital Assistant, PDA) and other electronic devices with communication functions.

[0092] See also Fig.10 and Fig.11 , Fig.10This is an exploded view of an electronic device in one embodiment of the present application. Fig.11 for Fig.10 The electronic device 200 may include a middle frame assembly 40 provided with an antenna assembly 100, a display screen 50 provided on one side of the middle frame assembly 40 and used to display information, a battery cover 60 connected to the other side of the middle frame assembly 40, a circuit board 70 installed on the middle frame assembly 40 and used to control the display screen 50 and the antenna assembly 100, and a battery 80 installed on the middle frame assembly 40 and used to power the electronic device 200 for normal operation.

[0093] The display screen 50 may be a liquid crystal display (LCD) or an organic light-emitting diode (OLED) display screen, etc., for displaying information and images.

[0094] The material of the middle frame assembly 40 can be a metal such as magnesium alloy, aluminum alloy, stainless steel, etc. Of course, the material is not limited thereto, and can also be other materials such as insulating materials, such as hard materials. The middle frame assembly 40 can be placed between the display screen 50 and the battery cover 60. The middle frame assembly 40 can be used to carry the display screen 50. The middle frame assembly 40 is snap-fitted with the battery cover 60 to form the outer contour of the electronic device 200, and a receiving cavity is formed inside. The receiving cavity can be used to accommodate electronic components such as the camera, the circuit main board 70, the battery 80, the processor (disposed on the circuit main board 70, so in some embodiments it can be part of the circuit main board 70), the antenna assembly 100, and various types of sensors in the electronic device 200.

[0095] The circuit main board 70 is installed in the accommodating cavity and can be installed at any position in the accommodating cavity. The circuit main board 70 can be the main board of the electronic device 200. The processor of the electronic device 200 can be set on the circuit main board 70. The circuit main board 70 can also be integrated with one, two or more functional components such as a motor, a microphone, a speaker, a receiver, an earphone interface, a universal serial bus interface (USB interface), a camera, a distance sensor, an ambient light sensor, a gyroscope, etc. At the same time, the display screen 50 can be electrically connected to the circuit main board 70.

[0096] The battery 80 is installed in the accommodating cavity and can be installed at any position in the accommodating cavity. The battery 80 can be electrically connected to the circuit main board 70 so that the battery 80 can power the electronic device 200. A power management circuit can be provided on the circuit main board 70. The power management circuit is used to distribute the voltage provided by the battery 80 to various electronic components in the electronic device 200, such as the display screen 50.

[0097] The battery cover 60 can be made of the same material as the middle frame assembly 40, or other materials. The battery cover 60 can be integrally formed with the middle frame assembly 40. In some embodiments, the battery cover 60 can wrap the middle frame assembly 40 and can carry the display screen 50. The battery cover 60 can be formed with a rear camera hole, a fingerprint recognition module installation hole, and other structures.

[0098] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element at the same time.

[0099] See also Fig.10 and Fig.12 , Fig.12 for Fig.10 A schematic diagram of the structure of the frame assembly 40 in the illustrated embodiment. The middle frame assembly 40 may include a substrate 41 for carrying the display screen 50 and a frame 42 arranged around the substrate 41. The substrate 41 is arranged opposite to the battery cover 60. The frame 42 can be used to be snap-fitted with the battery cover 60. That is, the substrate 41, the frame 42 and the battery cover 60 are arranged to form a receiving cavity.

[0100] The substrate 41 may be a conductive metal, or other materials. A ground plane and a feed source may be provided on the substrate 41. The ground plane serves as a ground. In some embodiments, the ground plane and the feed source may not be provided on the substrate 41, but may be directly provided on the circuit main board 70. In some embodiments, the substrate 41 may be omitted.

[0101] The frame 42 may be a conductive metal, so the frame 42 may also be referred to as a "metal frame". Of course, the frame 42 may also be other materials, such as insulating materials. The frame 42 may also be made of the same material as the substrate 41. The frame 42 may include a first frame 421, a second frame 422, a third frame 423, and a fourth frame 424 connected end to end in sequence. The first frame 421, the second frame 422, the third frame 423, and the fourth frame 424 are arranged around the substrate 41 and may be connected and fixed to the substrate 41. In some embodiments, the frame 42 may be an integral structure with the battery cover 60. For example, the frame 42 extends from the edge of the battery cover 60 to one side of the display screen 50 so as to be snap-fitted and connected to the display screen 50.

[0102] In some embodiments, the first frame 421, the second frame 422, the third frame 423 and the fourth frame 424 are arranged to form a rounded rectangle. Of course, other shapes such as a circle, a triangle, etc. are also possible. In some embodiments, the first frame 421 and the third frame 423 are arranged opposite to each other, and the second frame 422 and the fourth frame 424 are arranged opposite to each other.

[0103] In some embodiments, the lengths of the first frame 421 and the third frame 423 are both shorter than the length of the second frame 422 , and shorter than the length of the fourth frame 424 .

[0104] It can be understood that the middle frame assembly 40 and the battery cover 60 can form a main housing. In some embodiments, the main housing is not limited to the middle frame assembly 40 and the battery cover 60, but can also include other components, which will not be described in detail.

[0105] See also Fig.12 . The antenna assembly 100 can be mounted on the middle frame assembly 40. In some embodiments, the antenna assembly 100 can be a part of the middle frame assembly 40. Of course, in some embodiments, the antenna assembly 100 can also be mounted on other locations of the main housing, such as the battery cover 60. In some embodiments, the antenna assembly 100 can be processed from the main housing. For example, the antenna assembly 100 appears as a slot antenna. In some embodiments, the antenna assembly 100 can be directly fixed to the main housing.

[0106] The first radiator 10 is disposed on the frame 42, such as the first frame 421, and the second radiator 20 is disposed on the first frame 421 and may be located on a side of the first radiator 10 away from the fourth frame 424. In some embodiments, the second radiator 20 may be extended toward one side of the second frame 422 and may be further extended along the length direction of the second frame 422 to be partially disposed on the second frame 422.

[0107] In one embodiment, the first feed source 15 and the second feed source 25 may be feed sources on the substrate 41 or the circuit board 70 .

[0108] In one embodiment, the ground may be a ground plane on the substrate 41 or the circuit board 70 .

[0109] See also Fig.13 , Fig.13 for Fig.10 A schematic diagram of the structure of the frame assembly 40 in another embodiment of the embodiment shown. A gap 43 is provided between the first frame 421 and the substrate 41. The gap 43 can be extended toward the second frame 422 in the extension direction of the first frame 421. The gap 43 can be extended in the extension direction of the second frame 422 to be formed between the second frame 422 and the substrate 41.

[0110] The first frame 421 is provided with a slot 4211 and a slot 4212 which are connected to the slot 43 , so that the first radiator 10 of the antenna assembly 100 is formed between the slot 4211 and the slot 4212 .

[0111] The second frame 422 is provided with a slot 4221 communicating with the slot 43 , so that the frame 42 forms the second radiator 20 of the antenna assembly 100 between the slot 4212 and the slot 4221 .

[0112] In the present application, the first radiator 10 utilizes the first frame 421 , and the second radiator 20 utilizes the portion where the first frame 421 and the second frame 422 are connected to the first frame 421 , which can effectively improve the performance loss of the antenna assembly 100 caused by human hands.

[0113] It can be understood that in order to stabilize the connection strength between the substrate 41 and the frame 42, an insulating material such as resin can be filled between the gaps 43, 4211, 4212 and 4221, so that the first radiator 10 and the second radiator 20 in the antenna assembly 100 are part of the frame 42, which further improves the appearance of the electronic device 200.

[0114] Please refer again Fig.10 and Fig.11 The battery cover 60 is disposed on one side of the middle frame assembly 40 and is respectively connected to the frames 42 , such as the first frame 421 , the second frame 422 , the third frame 423 and the fourth frame 424 , and is disposed opposite to the substrate 41 .

[0115] In some embodiments, the battery cover 60 is provided with a camera metal decorative piece 61, which is located at the portion where the battery cover 60 is connected to the first frame 421, and the orthographic projection of the first frame 421 is located on the side of the first radiator 10 away from the second radiator 20. This reduces the influence of the camera metal decorative piece 61 on the antenna performance of the first radiator 10.

[0116] Next, an electronic device is described, see Fig.14 , Fig.14 Schematic diagram of the structure of an electronic device 300 in an embodiment of the present application. The electronic device 300 can be a mobile phone, a tablet computer, a laptop computer, a wearable device, etc. The diagram of this embodiment takes a mobile phone as an example. The structure of the electronic device 300 may include an RF circuit 310 (such as the antenna assembly 100 in the above embodiment), a memory 320, an input unit 330, a display unit 340 (such as the display screen 50 in the above embodiment), a sensor 350, an audio circuit 360, a WiFi module 370, a processor 380, and a power supply 390 (such as the battery 80 in the above embodiment). Among them, the RF circuit 310, the memory 320, the input unit 330, the display unit 340, the sensor 350, the audio circuit 360, and the WiFi module 370 are respectively connected to the processor 380. The power supply 390 is used to provide power to the entire electronic device 300.

[0117] Specifically, the RF circuit 310 is used to receive and send signals. The memory 320 is used to store data instruction information. The input unit 330 is used to input information, and may specifically include a touch panel 3301 and other input devices 3302 such as operation buttons. The display unit 340 may include a display panel 3401, etc. The sensor 350 includes an infrared sensor, a laser sensor, a position sensor, etc., which are used to detect user approach signals, distance signals, etc. The speaker 3601 and the microphone (or microphone, or receiver component) 3602 are connected to the processor 380 through the audio circuit 360 for receiving and sending sound signals. The WiFi module 370 is used to receive and transmit WiFi signals. The processor 380 is used to process data information of the electronic device.

[0118] In the several embodiments provided in this application, it should be understood that the disclosed device can be implemented in other ways. For example, the device implementation described above is only illustrative, for example, the division of modules or units is only a logical function division, and there may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed.

[0119] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0120] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0121] The above descriptions are merely embodiments of the present application and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. An antenna assembly, characterized in that: include: A first radiator, comprising a first free end, a second free end, a first feeding point between the first free end and the second free end, and an isolation point between the first feeding point and the first free end, wherein the first feeding point is used to receive a first excitation signal, and the first free end is grounded; a second radiator, having a third free end spaced apart from the first free end and a second feeding point for receiving a second excitation signal; as well as An isolation circuit is connected to the isolation point, and the isolation circuit is configured to be in a low impedance state in an operating frequency band of the first excitation signal.

2. The antenna assembly according to claim 1, characterized in that: The isolation circuit is configured to be in a short-circuit state in an operating frequency band of the first excitation signal.

3. The antenna assembly according to claim 1 or 2, characterized in that: The first free end is grounded through a grounding member, and in the low impedance state, the isolation circuit is used to form an equivalent grounding path of the first excitation signal together with the grounding member.

4. The antenna assembly according to claim 3, characterized in that: In a direction parallel to the first radiator, a width of the equivalent grounding path is greater than a width of the grounding element.

5. The antenna assembly according to claim 1, 2 or 4, characterized in that: The first excitation signal is used to excite the first radiator to generate a first resonance mode supporting a first frequency band in a wireless fidelity WiFi frequency band, and the first resonance mode is a 1 / 4 wavelength mode from the second free end to the isolation point.

6. The antenna assembly according to claim 5, characterized in that: The first excitation signal is used to excite the first radiator to generate a second resonance mode supporting the global positioning system GPS frequency band, the second resonance mode is a 1 / 4 wavelength mode from the second free end to the first free end, and the isolation circuit is configured to be in a high impedance state in the second resonance mode.

7. The antenna assembly according to claim 6, characterized in that: The isolation circuit is configured to be in an open circuit state in the GPS frequency band.

8. The antenna assembly according to claim 5, characterized in that: The first excitation signal is used to excite the first radiator to generate a third resonance mode that supports the second frequency band in the WiFi frequency band, the third resonance mode is a 3 / 4 wavelength mode from the second free end to the first free end, the isolation circuit is configured to be in a high impedance state in the third resonance mode, and the second frequency band is different from the first frequency band.

9. The antenna assembly according to claim 8, characterized in that: The second frequency band includes the WiFi5G frequency band.

10. The antenna assembly according to claim 8 or 9, characterized in that: The isolation circuit is configured to be in an open circuit state in the third resonance mode.

11. The antenna assembly according to claim 5, characterized in that: The first excitation signal is used to excite the first radiator to generate a fourth resonance mode supporting a third frequency band in the WiFi frequency band, and the fourth resonance mode is a 1 / 4 wavelength mode from the second free end to the first feeding point.

12. The antenna assembly according to claim 11, characterized in that: The third frequency band includes the WiFi5G frequency band.

13. The antenna assembly according to claim 5, characterized in that: The first frequency band includes the WiFi 2.4G frequency band.

14. The antenna assembly according to claim 5, characterized in that: The second excitation signal is used to excite the second radiator to generate a resonant mode supporting the medium and high frequency bands or to excite the second radiator to generate a resonant mode supporting the medium and high frequency bands and the new radio NR band.

15. The antenna assembly according to claim 13, characterized in that: The second excitation signal is used to excite the second radiator to generate a fifth resonance mode supporting a fourth frequency band in the mid-high frequency band, and the isolation circuit is configured to adjust the isolation between the first radiator in the first resonance mode and the second radiator in the fifth resonance mode.

16. The antenna assembly according to claim 15, characterized in that The fourth frequency band includes the Long Term Evolution LTE B40 and / or LTE B41 frequency band.

17. The antenna assembly according to claim 1, 2 or 4, characterized in that: The isolation circuit comprises: A first capacitor, one end of which is connected to the isolation point; A second capacitor, one end of which is connected to the other end of the first capacitor, and the other end of which is grounded; and The first inductor has one end connected to the other end of the first capacitor and the other end grounded.

18. The antenna assembly according to claim 1, 2 or 4, characterized in that: The antenna assembly further comprises: A human body electromagnetic wave absorption detection circuit connected to the isolation point; a third capacitor connected to the first feeding point, so that the first feeding point receives the first excitation signal through the third capacitor; a fourth capacitor, disposed between the isolation point and the isolation circuit, so that the isolation point and the isolation circuit are connected through the fourth capacitor; and A fifth capacitor has one end connected to the first free end and the other end grounded, so that the first free end is grounded through the fifth capacitor.

19. A middle frame assembly, characterized in that: include: substrate; A frame connected to the substrate and arranged around the substrate; as well as According to the antenna assembly as described in any one of claims 1-18, the first radiator and the second radiator are arranged on the frame.

20. An electronic device, characterized in that: include: Middle frame components, including: substrate; a frame connected to the substrate, comprising a first frame, a second frame, a third frame and a fourth frame which are sequentially connected end to end and are arranged around the substrate, the first frame and the third frame are arranged opposite to each other, the second frame and the fourth frame are arranged opposite to each other, and the lengths of the first frame and the third frame are both shorter than the length of the second frame and shorter than the length of the fourth frame; The antenna assembly according to any one of claims 1 to 18, wherein the first radiator is disposed on the first frame, and the second radiator is disposed at least on the first frame and is located on a side of the first radiator away from the fourth frame; A battery cover, which is disposed on one side of the middle frame assembly and is respectively connected to the first frame, the second frame, the third frame and the fourth frame, and is disposed opposite to the substrate. The battery cover is provided with a camera metal decorative piece, and the camera metal decorative piece is located at a portion where the battery cover is connected to the first frame, and its orthographic projection on the first frame is located on a side of the first radiator away from the second radiator; as well as The display screen is arranged on the other side of the middle frame assembly, and is respectively connected to the first frame, the second frame, the third frame and the fourth frame, and is arranged opposite to the substrate.

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