Antenna assembly and electronic device

Abstract

The embodiments of the present application relate to the technical field of communications, and specifically relate to an antenna assembly and an electronic device. An antenna assembly matching circuit provided in the embodiments of the present application is used for enabling the antenna assembly to generate a first resonance and a second resonance, the resonance frequency of the first resonance being less than the resonance frequency of the second resonance; the first resonance comprises a first sub-resonance and a second sub-resonance, and / or the second resonance comprises a third sub-resonance and a fourth sub-resonance; the resonance frequency of the first resonance is located in a first communication frequency band, and the resonance frequency of the second resonance is located in a second communication frequency band; a gap capacitor enables the difference between the resonance frequency of the first resonance and the resonance frequency of the second resonance to be less than or equal to 2 GHz, such that the first communication frequency band and the second communication frequency band cover different communication frequency bands, thereby increasing the bandwidth of antenna assemblies.

Description

Antenna assembly and electronic device

[0001] The present application claims priority to the Chinese patent application No. 202411074867.1, filed on August 6, 2024, and entitled "Antenna assembly and electronic device", the entire content of which is incorporated herein by reference. TECHNICAL FIELD

[0002] Embodiments of the present application relate to the field of communication technology, in particular to an antenna assembly and an electronic device. BACKGROUND

[0003] Electronic devices (such as mobile phones, tablets, etc.) generally have an antenna assembly, which realizes wireless communication between the electronic device and communication base stations, satellites, and other devices. However, the bandwidth of the antenna assembly is generally small, which affects the communication performance of the electronic device. SUMMARY

[0004] Embodiments of the present application provide an antenna assembly and an electronic device, which are used to improve the bandwidth of the antenna assembly.

[0005] In a first aspect, an antenna assembly is provided, comprising: a ground plate, a radiator, a matching circuit, and a gap capacitor, the radiator is disposed on the ground plate, the radiator and the ground plate have a first gap therebetween, along the extension direction of the radiator, both ends of the radiator are ground terminals; the radiator is provided with a second gap in communication with the first gap; the matching circuit is coupled with a feed point on the radiator, the matching circuit is used to make the antenna assembly produce a first resonance and a second resonance, the resonance frequency of the first resonance is less than the resonance frequency of the second resonance; wherein the first resonance includes a first sub-resonance and a second sub-resonance, and / or the second resonance includes a third sub-resonance and a fourth sub-resonance; the radiator at both ends of the second gap is coupled through the gap capacitor, the gap capacitor is used to make the difference between the resonance frequency of the first resonance and the resonance frequency of the second resonance less than or equal to 2 GHz.

[0006] Through the above arrangement, the matching circuit is used to make the antenna assembly produce a first resonance and a second resonance, the resonance frequency of the first resonance is less than the resonance frequency of the second resonance; the first resonance includes a first sub-resonance and a second sub-resonance, and / or the second resonance includes a third sub-resonance and a fourth sub-resonance; the resonance frequency of the first resonance is within a first communication frequency band, and the resonance frequency of the second resonance is within a second communication frequency band; the gap capacitor makes the difference between the resonance frequency of the first resonance and the resonance frequency of the second resonance less than or equal to 2 GHz, so that the first communication frequency band and the second communication frequency band cover different communication frequency bands, thereby increasing the bandwidth of the antenna assembly.

[0007] In some embodiments including the above-mentioned embodiments, the length of the radiator along the extending direction of the radiator can be about half of the wavelength corresponding to the resonant frequency of the second resonance. In this way, the length of the radiator can be reduced while the second resonance meets the high frequency requirement. Meanwhile, the resonant frequency of the first resonance can be adjusted by the slot capacitance so that the difference between the resonant frequency of the first resonance and the resonant frequency of the second resonance is less than or equal to 2 GHz.

[0008] In some embodiments including the above-mentioned embodiments, when the difference between the resonant frequency of the first resonance and the resonant frequency of the second resonance is less than or equal to 2 GHz and greater than or equal to 1.5 GHz, the capacitance value of the slot capacitance is less than or equal to 2 pF; when the difference between the resonant frequency of the first resonance and the resonant frequency of the second resonance is less than 1.5 GHz, the capacitance value of the slot capacitance is less than or equal to 5 pF. In this way, the difference between the resonant frequency of the first resonance and the resonant frequency of the second resonance is less than 2 GHz while avoiding the capacitance value of the slot capacitance being too large or too small. Of course, the impedance matching of the antenna assembly can also be performed by the slot capacitance.

[0009] In some embodiments including the above-mentioned embodiments, the slot capacitance can be a distributed capacitance. For example, the slot capacitance can include the equivalent capacitance of the part of the radiator at one end of the second slot, the part of the radiator at the other end of the second slot, and the second slot. Of course, the slot capacitance can also be a lumped capacitance. For example, the slot capacitance can include a capacitor device which can be arranged on the main plate, and of course, the capacitor device can also be arranged between the main plate and the radiator.

[0010] In some embodiments including the above-mentioned embodiments, the first resonance includes a first sub-resonance and a second sub-resonance, and the matching circuit includes a first sub-matching circuit. The first sub-matching circuit includes a first inductor and a first capacitor, and the first inductor is in series with the first capacitor. One end of the first capacitor is coupled to the feed point, the other end of the first capacitor is coupled to one end of the first inductor, and the other end of the first inductor can be coupled to the radio frequency device to receive the radio frequency signal. Alternatively, one end of the first inductor is coupled to the feed point, the other end of the first inductor is coupled to one end of the first capacitor, and the other end of the first capacitor is coupled to the radio frequency device to receive the radio frequency signal. The resonant frequency of the first sub-resonance and the resonant frequency of the second sub-resonance collectively cover the first communication frequency band. In this way, the bandwidth of the first resonance can be increased, and the bandwidth of the antenna assembly can be further improved.

[0011] In some embodiments including the above-mentioned embodiments, the resonant frequency of the second sub-resonance is greater than the resonant frequency of the first sub-resonance.

[0012] In some embodiments including the above-mentioned embodiments, under the first sub-resonance and the second sub-resonance, the current directions on the radiator are the same; under the second resonance, the radiator has a first small current point, and the current directions on the radiator on both sides of the first small current point are opposite. In this way, under the first sub-resonance and the second sub-resonance, the modes of the antenna assembly are the same, which are common mode (CM mode for short); under the second resonance, the antenna assembly is in a differential mode (DM mode for short). It can be understood that the first small current point can be a position where the current on the radiator is close to zero.

[0013] In some embodiments including the above-mentioned embodiments, the second resonance includes a third sub-resonance and a fourth sub-resonance, the matching circuit includes a second sub-matching circuit, the second sub-matching circuit includes a second capacitor and a second inductor, one end of the second inductor is coupled to the feeding point, one end of the second capacitor is connected to one end of the second inductor, the other end of the second capacitor is grounded, and the other end of the second inductor is configured to receive the radio frequency signal. The resonant frequency band of the third sub-resonance and the resonant frequency band of the fourth sub-resonance collectively cover the second communication frequency band, thereby increasing the bandwidth of the second resonance and further increasing the bandwidth of the antenna assembly.

[0014] In some embodiments including the above-mentioned embodiments, the radiator includes a midpoint in the extension direction thereof, the feeding point is located on one side of the midpoint, and the second gap is located on the other side of the midpoint.

[0015] In some embodiments including the above-mentioned embodiments, the resonant frequency of the fourth sub-resonance is greater than the resonant frequency of the third sub-resonance.

[0016] In some embodiments including the above-mentioned embodiments, under the first resonance, the current directions on the radiator are the same, and the antenna assembly is in a CM mode; under the third sub-resonance and the fourth sub-resonance, the radiator has a first small current point, the current directions on the radiator on both sides of the first small current point are opposite, and the modes of the third sub-resonance and the fourth sub-resonance are the same, which are DM modes.

[0017] In some embodiments including the above-mentioned embodiments, the radiator includes a midpoint in the extension direction thereof, and the distance between the second gap and the midpoint is less than or equal to one fourth of the length of the radiator. In this way, the difference between the resonant frequency of the first resonance and the resonant frequency of the second resonance can be moderate.

[0018] In some embodiments including the above-mentioned embodiments, the radiator comprises a first end and a second end, the feed point and the second slot are located between the first end and the second end, and the feed point is located between the second slot and the first end; the distance between the feed point and the first end is less than or equal to one third of the length of the radiator; so that the difference between the resonant frequency of the first sub-resonance and the resonant frequency of the second sub-resonance is less than or equal to 150 MHz. In this way, the first sub-resonance and the second sub-resonance can be close to each other, thereby ensuring the communication quality in the corresponding communication frequency band of the first resonance; on the other hand, the resonant frequency of the first sub-resonance and the resonant frequency of the second sub-resonance can also be located in the corresponding communication frequency band.

[0019] In some embodiments including the above-mentioned embodiments, the radiator comprises a first end and a second end, the feed point and the second slot are located between the first end and the second end, and the feed point is located between the second slot and the first end; the distance between the feed point and the first end is less than or equal to one third of the length of the radiator; so that the difference between the resonant frequency of the third sub-resonance and the resonant frequency of the fourth sub-resonance is less than or equal to 500 MHz. In this way, the third sub-resonance and the fourth sub-resonance can be close to each other, thereby ensuring the communication quality in the corresponding communication frequency band of the second resonance; on the other hand, the resonant frequency of the third sub-resonance and the resonant frequency of the fourth sub-resonance can also be located in the corresponding communication frequency band.

[0020] In some embodiments including the above-mentioned embodiments, the first resonance and the second resonance are both double resonances, that is, the first resonance comprises a first sub-resonance and a second sub-resonance, and the second resonance comprises a third sub-resonance and a fourth sub-resonance. The first sub-resonance and the second sub-resonance together cover the first communication frequency band to increase the bandwidth of the first resonance, and the third sub-resonance and the fourth sub-resonance together cover the second communication frequency band to increase the bandwidth of the second resonance. Through the above arrangement, the bandwidths of the first resonance and the second resonance can be increased, further increasing the bandwidth of the antenna assembly.

[0021] In a second aspect, the embodiments of the present application also provide an antenna assembly, comprising: a ground plate, a radiator, a matching circuit, and a grounding inductor, the radiator is arranged on the ground plate and both ends of the radiator are open ends along the extension direction thereof; the matching circuit is coupled with a feed point on the radiator, and the matching circuit is used to make the antenna assembly generate a first resonance and a second resonance, the resonant frequency of the first resonance is less than the resonant frequency of the second resonance; wherein the first resonance comprises a first sub-resonance and a second sub-resonance, and / or the second resonance comprises a third sub-resonance and a fourth sub-resonance; one end of the grounding inductor is coupled with a grounding point on the radiator, and the other end of the grounding inductor is grounded, and the grounding inductor is used to make the difference between the resonant frequency of the first resonance and the resonant frequency of the second resonance less than or equal to 2 GHz.

[0022] By the above arrangement, the matching circuit is configured to cause the antenna assembly to generate a first resonance and a second resonance, the first resonance having a resonance frequency less than a resonance frequency of the second resonance; the first resonance including a first sub-resonance and a second sub-resonance, and / or the second resonance including a third sub-resonance and a fourth sub-resonance; the resonance frequency of the first resonance being within a first communication frequency band, and the resonance frequency of the second resonance being within a second communication frequency band; the ground inductance causing a difference between the resonance frequency of the first resonance and the resonance frequency of the second resonance to be less than or equal to 2 GHz, such that the first communication frequency band and the second communication frequency band cover different communication frequency bands, thereby increasing a bandwidth of the antenna assembly.

[0023] In some embodiments including the above embodiments, along the extension direction of the radiator, the length of the radiator can be about half of the wavelength corresponding to the resonance frequency of the second resonance. In this way, the length of the radiator can be reduced while the second resonance meets the high frequency requirement; meanwhile, the first resonance can be adjusted by the ground inductance so that the difference between the resonance frequency of the first resonance and the resonance frequency of the second resonance is less than or equal to 2 GHz.

[0024] In some embodiments including the above embodiments, when the difference between the resonance frequency of the first resonance and the resonance frequency of the second resonance is less than or equal to 2 GHz and greater than or equal to 1.5 GHz, the inductance value of the ground inductance is less than or equal to 3 nH; when the difference between the resonance frequency of the first resonance and the resonance frequency of the second resonance is less than 1.5 GHz, the inductance value of the ground inductance is less than or equal to 5 nH. This ensures that the inductance value of the ground inductance 116 is moderate, and of course, the impedance matching of the antenna assembly can also be performed by the ground inductance.

[0025] In some embodiments including the above embodiments, the ground inductance can be a distributed inductance. For example, the ground inductance can include a conductor (such as a metal sheet, a wire, etc.) having a certain inductance between the ground plate and the radiator. Of course, the ground inductance can also be a lumped inductance. For example, the ground inductance can include an inductor, which can be arranged on the mainboard, and of course, the inductor can also be arranged between the mainboard and the radiator.

[0026] In some embodiments including the above embodiments, the first resonance includes a first sub-resonance and a second sub-resonance, and the matching circuit includes a first sub-matching circuit, the first sub-matching circuit including a first inductor and a first capacitor, the first inductor and the first capacitor being connected in series. The first sub-matching circuit causes the antenna assembly to form the first sub-resonance and the second sub-resonance. The resonance frequency of the first sub-resonance and the resonance frequency of the second sub-resonance together cover the first communication frequency band, so that the bandwidth of the first resonance can be increased, and the bandwidth of the antenna assembly can be further improved.

[0027] In some embodiments including the above embodiments, the resonance frequency of the second sub-resonance is greater than the resonance frequency of the first sub-resonance.

[0028] In some embodiments including the above-mentioned embodiments, the radiator has a second small current point on the radiator at the first sub-resonance and the second sub-resonance, the current directions on the radiator on both sides of the second small current point are opposite; the current directions on the radiator are the same at the second resonance. In this way, the antenna assembly has the same mode at the first sub-resonance and the second sub-resonance, both of which are DM modes; the antenna assembly is in the CM mode at the second resonance. It can be understood that the second small current point can be a position where the current on the radiator is close to zero.

[0029] In some embodiments including the above-mentioned embodiments, the second resonance includes a third sub-resonance and a fourth sub-resonance, the matching circuit includes a second sub-matching circuit, the second sub-matching circuit includes a second capacitor and a second inductor, one end of the second inductor is coupled to the feeding point, one end of the second inductor is connected to one end of the second capacitor, the other end of the second capacitor is grounded, and the other end of the second inductor is configured to receive the radio frequency signal. The second sub-matching circuit can make the antenna assembly form the third sub-resonance and the fourth sub-resonance. The resonant frequency band of the third sub-resonance and the resonant frequency band of the fourth sub-resonance together cover the second resonant frequency band, thereby increasing the bandwidth of the second resonance and further increasing the bandwidth of the antenna assembly.

[0030] In some embodiments including the above-mentioned embodiments, the radiator includes a midpoint of the extension direction of the radiator, the feeding point and the grounding point are both located on the same side of the midpoint, and the grounding point is located between the feeding point and the midpoint.

[0031] In some embodiments including the above-mentioned embodiments, the distance between the feeding point and the grounding point is less than or equal to one-eighth of the length of the radiator, and the distance between the grounding point and the midpoint is less than or equal to three-eighths of the length of the radiator. In this way, the difference between the resonant frequency of the first sub-resonance and the resonant frequency of the second sub-resonance can be moderate.

[0032] In some embodiments including the above-mentioned embodiments, the resonant frequency of the fourth sub-resonance is greater than the resonant frequency of the third sub-resonance.

[0033] In some embodiments including the above-mentioned embodiments, the radiator has a second small current point on the radiator at the first resonance, the current directions on the radiator on both sides of the second small current point are opposite; the current directions on the radiator are the same at the third sub-resonance and the fourth sub-resonance. In this way, the antenna assembly is in the CM mode at the first resonance; the antenna assembly has the same mode at the third sub-resonance and the fourth sub-resonance, both of which are DM modes.

[0034] In some embodiments including the above-mentioned embodiments, the radiator comprises a first end and a second end, the feed point and the grounding point are located between the first end and the second end, and the feed point is located between the grounding point and the first end; the distance between the feed point and the first end is less than or equal to one third of the length of the radiator; so that the resonant frequency of the first sub-resonance and the resonant frequency of the second sub-resonance are less than or equal to 150 MHz. In this way, the first sub-resonance and the second sub-resonance can be close to each other, thereby ensuring the communication quality in the first resonant frequency band; on the other hand, the resonant frequency of the first sub-resonance and the resonant frequency of the second sub-resonance can be located in the corresponding communication frequency band.

[0035] In some embodiments including the above-mentioned embodiments, the radiator comprises a first end and a second end, the feed point and the grounding point are located between the first end and the second end, and the feed point is located between the grounding point and the first end; the distance between the feed point and the first end is less than or equal to one third of the length of the radiator; so that the resonant frequency of the third sub-resonance and the resonant frequency of the fourth sub-resonance are less than or equal to 500 MHz. In this way, the third sub-resonance and the fourth sub-resonance can be close to each other, thereby ensuring the communication quality in the second resonant frequency band; on the other hand, the resonant frequency of the third sub-resonance and the resonant frequency of the fourth sub-resonance can be located in the corresponding communication frequency band.

[0036] In some embodiments including the above-mentioned embodiments, the first resonance and the second resonance are both double resonances, that is, the first resonance comprises a first sub-resonance and a second sub-resonance, and the second resonance comprises a third sub-resonance and a fourth sub-resonance. The first sub-resonance and the second sub-resonance together cover the first resonant frequency band to increase the bandwidth of the first resonance, and the third sub-resonance and the fourth sub-resonance together cover the second resonant frequency band to increase the bandwidth of the second resonance. Through the above arrangement, the bandwidth of the first resonance and the second resonance can be increased, further increasing the bandwidth of the antenna assembly.

[0037] In some embodiments including the above-mentioned embodiments, the floor comprises adjacent first and second side edges, and the radiator comprises a first branch opposite the first side edge and a second branch opposite the second side edge. That is, the radiator is arranged at the corner of the floor, and in this way, the space of the floor can be fully utilized, and the structural compactness of the electronic device can be improved.

[0038] In a third aspect, the embodiments of the present application also provide an electronic device, comprising: a radio frequency device and an antenna assembly as described above, the radio frequency device being coupled with the feed point. The antenna assembly in the electronic device can generate a first resonance and a second resonance, the difference between the resonant frequency of the first resonance and the resonant frequency of the second resonance being less than or equal to 2 GHz, so that the first communication frequency band and the second communication frequency band cover different communication frequency bands, thereby increasing the bandwidth of the antenna assembly. BRIEF DESCRIPTION OF DRAWINGS

[0039] FIG. 1 is a structural schematic diagram of an electronic device according to an embodiment of the present application;

[0040] FIG. 2 is a structural schematic diagram of an antenna assembly according to an embodiment of the present application;

[0041] FIG. 3 is a structural schematic diagram of an antenna assembly according to an embodiment of the present application;

[0042] FIG. 4 is a return loss diagram of an antenna assembly according to an embodiment of the present application;

[0043] FIG. 5 is an impedance circle diagram of an antenna assembly according to an embodiment of the present application;

[0044] FIG. 6 is a current schematic diagram of the antenna assembly shown in FIG. 3;

[0045] FIG. 7 is an antenna efficiency diagram of an antenna assembly according to an embodiment of the present application;

[0046] FIG. 8 is a structural schematic diagram of an antenna assembly according to an embodiment of the present application;

[0047] FIG. 9 is a structural schematic diagram of an antenna assembly according to an embodiment of the present application;

[0048] FIG. 10 is a return loss diagram of an antenna assembly according to an embodiment of the present application;

[0049] FIG. 11 is an impedance circle diagram of an antenna assembly according to an embodiment of the present application;

[0050] FIG. 12 is an antenna efficiency diagram of an antenna assembly according to an embodiment of the present application;

[0051] FIG. 13 is a structural schematic diagram of an antenna assembly according to an embodiment of the present application;

[0052] FIG. 14 is a structural schematic diagram of an antenna assembly according to an embodiment of the present application;

[0053] FIG. 15 is a return loss diagram of an antenna assembly according to an embodiment of the present application;

[0054] FIG. 16 is an impedance circle diagram of an antenna assembly according to an embodiment of the present application;

[0055] FIG. 17 is an antenna efficiency diagram of an antenna assembly according to an embodiment of the present application;

[0056] FIG. 18 is a return loss diagram of an antenna assembly according to an embodiment of the present application;

[0057] FIG. 19 is an antenna efficiency diagram of an antenna assembly according to an embodiment of the present application;

[0058] FIG. 20 is a structural schematic diagram of an antenna assembly according to an embodiment of the present application;

[0059] Fig. 21 is a return loss diagram five of the antenna assembly provided by the embodiment of the present application;

[0060] Fig. 22 is an impedance circle diagram four of the antenna assembly provided by the embodiment of the present application;

[0061] Fig. 23 is an antenna efficiency diagram five of the antenna assembly provided by the embodiment of the present application;

[0062] Fig. 24 is a current schematic diagram of the antenna assembly shown in Fig. 20;

[0063] Fig. 25 is a structural schematic diagram eight of the antenna assembly provided by the embodiment of the present application;

[0064] Fig. 26 is a structural schematic diagram nine of the antenna assembly provided by the embodiment of the present application;

[0065] Fig. 27 is a return loss diagram six of the antenna assembly provided by the embodiment of the present application;

[0066] Fig. 28 is an impedance circle diagram five of the antenna assembly provided by the embodiment of the present application;

[0067] Fig. 29 is an antenna efficiency diagram six of the antenna assembly provided by the embodiment of the present application;

[0068] Fig. 30 is a current schematic diagram of the antenna assembly shown in Fig. 26;

[0069] Fig. 31 is a structural schematic diagram ten of the antenna assembly provided by the embodiment of the present application;

[0070] Fig. 32 is a return loss diagram seven of the antenna assembly provided by the embodiment of the present application;

[0071] Fig. 33 is an antenna efficiency diagram seven of the antenna assembly provided by the embodiment of the present application;

[0072] Fig. 34 is a structural schematic diagram eleven of the antenna assembly provided by the embodiment of the present application;

[0073] Fig. 35 is a return loss diagram eight of the antenna assembly provided by the embodiment of the present application;

[0074] Fig. 36 is an antenna efficiency diagram eight of the antenna assembly provided by the embodiment of the present application;

[0075] Fig. 37 is a return loss diagram nine of the antenna assembly provided by the embodiment of the present application;

[0076] Fig. 38 is an antenna efficiency diagram nine of the antenna assembly provided by the embodiment of the present application;

[0077] Fig. 39 is a return loss diagram ten of the antenna assembly provided by the embodiment of the present application;

[0078] Fig. 40 is an antenna efficiency diagram ten of the antenna assembly provided by the embodiment of the present application;

[0079] Fig. 41 is a return loss plot XI I of an antenna assembly provided by embodiments of the application;

[0080] Fig. 42 is an antenna efficiency plot XI I of an antenna assembly provided by embodiments of the application;

[0081] Fig. 43 is a structural schematic diagram XII of an antenna assembly provided by embodiments of the application;

[0082] Fig. 44 is a structural schematic diagram XIII of an antenna assembly provided by embodiments of the application;

[0083] Fig. 45 is a return loss plot XII of an antenna assembly provided by embodiments of the application;

[0084] Fig. 46 is an antenna efficiency plot XII of an antenna assembly provided by embodiments of the application;

[0085] Fig. 47 is a current schematic diagram of the antenna assembly shown in Fig. 44;

[0086] Fig. 48 is a structural schematic diagram XIV of an antenna assembly provided by embodiments of the application;

[0087] Fig. 49 is a return loss plot XIII of an antenna assembly provided by embodiments of the application;

[0088] Fig. 50 is an antenna efficiency plot XIII of an antenna assembly provided by embodiments of the application;

[0089] Fig. 51 is a current schematic diagram of the antenna assembly shown in Fig. 48;

[0090] Fig. 52a is a structural schematic diagram XV of an antenna assembly provided by embodiments of the application;

[0091] Fig. 52b is a structural schematic diagram of an antenna assembly provided by embodiments of the application, in which multiple grounded inductors are arranged;

[0092] Fig. 53 is a structural schematic diagram XVI of an antenna assembly provided by embodiments of the application;

[0093] Fig. 54 is a return loss plot XIV of an antenna assembly provided by embodiments of the application;

[0094] Fig. 55 is an antenna efficiency plot XIV of an antenna assembly provided by embodiments of the application;

[0095] Fig. 56 is a current schematic diagram of the antenna assembly shown in Fig. 53;

[0096] Fig. 57 is a structural schematic diagram XVII of an antenna assembly provided by embodiments of the application;

[0097] Fig. 58 is a return loss plot XV of an antenna assembly provided by embodiments of the application;

[0098] Fig. 59 is an impedance circle plot VI of an antenna assembly provided by embodiments of the application;

[0099] Fig. 60 is a graph of antenna efficiency of the antenna assembly provided by the embodiment of the application;

[0100] Fig. 61 is a current schematic diagram of the antenna assembly shown in Fig. 57;

[0101] Fig. 62 is a structural schematic diagram of the antenna assembly provided by the embodiment of the application;

[0102] Fig. 63 is a graph of return loss of the antenna assembly provided by the embodiment of the application;

[0103] Fig. 64 is a graph of impedance circle of the antenna assembly provided by the embodiment of the application;

[0104] Fig. 65 is a graph of antenna efficiency of the antenna assembly provided by the embodiment of the application;

[0105] Fig. 66 is a current schematic diagram of the antenna assembly shown in Fig. 62;

[0106] Fig. 67 is a structural schematic diagram of the antenna assembly provided by the embodiment of the application;

[0107] Fig. 68 is a graph of return loss of the antenna assembly provided by the embodiment of the application;

[0108] Fig. 69 is a graph of impedance circle of the antenna assembly provided by the embodiment of the application;

[0109] Fig. 70 is a graph of antenna efficiency of the antenna assembly provided by the embodiment of the application;

[0110] Fig. 71 is a current schematic diagram of the antenna assembly shown in Fig. 67;

[0111] Fig. 72 is a structural schematic diagram of the antenna assembly provided by the embodiment of the application;

[0112] Fig. 73 is a graph of return loss of the antenna assembly provided by the embodiment of the application;

[0113] Fig. 74 is a graph of impedance circle of the antenna assembly provided by the embodiment of the application;

[0114] Fig. 75 is a graph of antenna efficiency of the antenna assembly provided by the embodiment of the application;

[0115] Fig. 76 is a current schematic diagram of the antenna assembly shown in Fig. 72;

[0116] Fig. 77 is a structural schematic diagram of the antenna assembly provided by the embodiment of the application;

[0117] Fig. 78 is a graph of return loss of the antenna assembly provided by the embodiment of the application;

[0118] Fig. 79 is a graph of antenna efficiency of the antenna assembly provided by the embodiment of the application;

[0119] Figure 80 is a schematic diagram of the antenna assembly provided in an embodiment of this application (22nd embodiment).

[0120] Figure 81 is a return loss diagram of the antenna assembly provided in an embodiment of this application;

[0121] Figure 82 is an antenna efficiency diagram of the antenna assembly provided in the embodiment of this application;

[0122] Figure 83 is a return loss diagram of the antenna assembly provided in an embodiment of this application (Figure 21).

[0123] Figure 84 is an antenna efficiency diagram (21) of the antenna assembly provided in the embodiment of this application;

[0124] Figure 85 is a return loss diagram of the antenna assembly provided in an embodiment of this application (Figure 22).

[0125] Figure 86 is an antenna efficiency diagram (22) of the antenna assembly provided in the embodiment of this application;

[0126] Figure 87 is a return loss diagram of the antenna assembly provided in an embodiment of this application (Figure 23).

[0127] Figure 88 is an antenna efficiency diagram of the antenna assembly provided in the embodiment of this application (Figure 23).

[0128] Figure 89 is a return loss diagram of the antenna assembly provided in the embodiment of this application (Figure 24).

[0129] Figure 90 is an antenna efficiency diagram (24) of the antenna assembly provided in the embodiment of this application;

[0130] Figure 91 is a schematic diagram of the antenna structure corresponding to the line common-mode mode;

[0131] Figure 92 shows the current and electric field distribution of the antenna structure in Figure 91;

[0132] Figure 93 is a schematic diagram of the antenna structure corresponding to the line differential mode;

[0133] Figure 94 shows the current and electric field distribution of the antenna structure in Figure 93;

[0134] Figure 95 is a schematic diagram of the antenna structure corresponding to the slot common-mode mode;

[0135] Figure 96 shows the current and electric field distribution of the antenna structure in Figure 95;

[0136] Figure 97 is a schematic diagram of the antenna structure corresponding to the slot differential mode;

[0137] Figure 98 shows the current and electric field distribution of the antenna structure in Figure 97.

[0138] Label explanation: 10: electronic device; 11: middle frame; 12: display panel; 13: mainboard; 14: middle plate; 15: frame; 110: radiator; 113: first gap; 114: second gap; 115: gap capacitor; 116: ground inductance; 120: ground plate; 121: first side; 122: second side; 130: matching circuit; 131: first sub-matching circuit; 132: second sub-matching circuit; a: midpoint; b: feed point; c: first small current point; d: second small current point; e: ground point. DETAILED DESCRIPTION

[0139] The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments.

[0140] Hereinafter, the terms "first", "second", and the like are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second", and the like can explicitly or implicitly include one or more of the features.

[0141] In addition, in the embodiments of the present application, the orientation terms "upper", "lower", "left", "right", "horizontal" and "vertical" are defined with respect to the orientation of the components shown in the drawings. It should be understood that these directional terms are relative concepts, which are used for relative description and clarification, and can be changed accordingly according to the change of the orientation of the components placed in the drawings.

[0142] Hereinafter, the terms that may appear in the embodiments of the present application are explained.

[0143] Connection / connection: should be understood in a broad sense, for example, "connection" can be fixed connection, electrical connection, or detachable connection, or integral; can be directly connected, or indirectly connected through intermediate medium.

[0144] Coupling: can be understood as direct coupling and / or indirect coupling, "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 the form of connection between different components in the circuit structure through the entity circuit of copper foil or wire of printed circuit board (PCB) that can transmit electrical signals; "indirect coupling" can be understood as electrical conduction through space / non-contact between two conductors. 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 realize signal transmission.

[0145] Opposite / Oppositely arranged: A and B are oppositely arranged can mean that A and B are arranged face to face. For example, when two radiators are oppositely arranged, the two radiators are arranged with at least a part of the area overlapping in a direction. In an embodiment, the two oppositely arranged radiators are adjacently arranged without other conductive bodies arranged therebetween, and without antenna structures arranged therebetween.

[0146] Lumped element / device: refers to a general term for elements whose size is much smaller than the wavelength relative to the operating frequency of the circuit. For a signal, the characteristics of the element remain fixed at any time, regardless of the frequency.

[0147] Distributed element / device: unlike lumped elements, if the size of the element is similar to or larger than the wavelength relative to the operating frequency of the circuit, the characteristics of each point of the element itself will be different when the signal passes through the element due to the change of the signal, and therefore the element as a whole cannot be regarded as a single body with fixed characteristics, and should be referred to as a distributed element.

[0148] Capacitance / capacitive structure: can be understood as lumped capacitance and / or distributed capacitance. Lumped capacitance refers to a component that exhibits capacitance, such as a capacitor element; distributed capacitance (or distributed capacitance) refers to an equivalent capacitance formed by two conductive parts spaced apart by a certain gap.

[0149] Inductance / inductive structure: can be understood as lumped inductance and / or distributed inductance. Lumped inductance refers to a component that exhibits inductance, such as an inductor element; distributed inductance (or distributed inductance) refers to an equivalent inductance formed by a conductive part of a certain length, such as an equivalent inductance formed by a conductor due to curling or rotation.

[0150] Radiating body, or antenna element: is a device in an antenna for receiving / sending electromagnetic wave radiation. In some cases, "antenna" is understood in a narrow sense as a radiating body, which changes the waveguide energy from a transmitter into radio waves, or converts radio waves into waveguide energy for radiating and receiving radio waves. The modulated high-frequency current energy (or waveguide energy) generated by the transmitter is transmitted to the transmitting radiating body through the feed line, which is converted into electromagnetic wave energy of a certain polarization by the radiating body and radiated in the desired direction. The receiving radiating body converts electromagnetic wave energy of a certain polarization from a certain direction in space into modulated high-frequency current energy, which is delivered to the input end of the receiver through the feed line.

[0151] The radiator (or antenna element) can include a conductor with a specific shape and size, such as a wire, or a patch, etc. The application does not limit the specific shape. In an embodiment, the wire radiator can be referred to as a wire antenna. In an embodiment, the wire radiator can be implemented by a conductive bezel, which can also be referred to as a bezel antenna. In an embodiment, the wire radiator can be implemented by a support conductor, which can also be referred to as a support antenna. In an embodiment, the wire diameter (e.g., including thickness and width) of the wire radiator, or the wire antenna, is much smaller (e.g., less than 1 / 16 of the wavelength) than the wavelength (e.g., the dielectric wavelength), and the length can be comparable to the wavelength (e.g., the length is around 1 / 8 of the wavelength, or 1 / 8 to 1 / 4, or 1 / 4 to 1 / 2, or longer). The main forms of the wire antenna include a dipole antenna, a half-wave vibrator antenna, a monopole antenna, a loop antenna, and an inverted F antenna (also referred to as IFA). For example, for a dipole antenna, each dipole antenna generally includes two radiating elements, and each element is fed by a feed from the feed end of the radiating element. For example, the inverted F antenna (IFA) can be obtained by adding a ground path to a monopole antenna. The IFA antenna has a feed point and a ground point, and is called an inverted F antenna because its side view is in the shape of an inverted F. In an embodiment, the patch radiator can include a microstrip antenna, or a patch antenna, such as a planar inverted F antenna (also referred to as PIFA). In an embodiment, the patch radiator can be implemented by a planar conductor (such as a conductive patch or a conductive coating, etc.). In an embodiment, the patch radiator can include a conductive patch, such as a copper patch, etc. In an embodiment, the patch radiator can include a conductive coating, such as silver paste, etc. The shape of the patch radiator includes a circle, a rectangle, a ring, etc. The structure of the microstrip antenna generally includes a dielectric substrate, a radiator, and a ground plate, wherein the dielectric substrate is arranged between the radiator and the ground plate.

[0152] The radiators (or antenna elements) can also include slots or gaps formed on the conductors, for example, closed or semi-closed slots or gaps formed on the grounded conductor plane. In one embodiment, the slotted or gapped radiators can be referred to as slot antennas or gap antennas. In one embodiment, the slots or gaps of the slot antennas / gap antennas have a radial dimension (e.g., including width) much smaller than the wavelength (e.g., dielectric wavelength) (e.g., less than 1 / 16 of the wavelength), and a length dimension comparable to the wavelength (e.g., dielectric wavelength) (e.g., around 1 / 8 of the wavelength, or 1 / 8 to 1 / 4, or 1 / 4 to 1 / 2, or longer). In one embodiment, the radiators with closed slots or gaps can be referred to as closed slot antennas. In one embodiment, the radiators with semi-closed slots or gaps (e.g., with openings added to the closed slots or gaps) can be referred to as open slot antennas. In some embodiments, the gap shape is long and thin. In some embodiments, the length of the gap is about half a wavelength (e.g., dielectric wavelength). In some embodiments, the length of the gap is about an integer number of wavelengths (e.g., one dielectric wavelength). In some embodiments, the gap can be fed by a transmission line that is connected across one or both sides of the gap, whereby an RF electromagnetic field is excited on the gap and electromagnetic waves are radiated into space. In one embodiment, the radiators of the slot antennas or gap antennas can be implemented by conductive frames that are grounded at both ends, which can also be referred to as frame antennas; in this embodiment, the slot antennas or gap antennas can be considered to include linear radiators that are spaced apart from the ground plane and grounded at both ends of the radiators, thereby forming closed or semi-closed slots or gaps. In one embodiment, the radiators of the slot antennas or gap antennas can be implemented by bracket conductors that are grounded at both ends, which can also be referred to as bracket antennas.

[0153] The feed circuit / structure is a combination of all components of an antenna for the purpose of reception and transmission of RF waves. In the case of a receiving antenna, the feed circuit can be considered as the antenna part from the first amplifier to the front-end transmitter. In a transmitting antenna, the feed circuit can be considered as the part after the last power amplifier. In some cases, the "feed circuit" is understood in a narrow sense as the RF chip, or the transmission path including the RF chip to the feed point on the radiator or transmission line. The feed circuit has the function of converting radio waves into electrical signals and sending them to the receiver components. In general, it is considered as part of the antenna for converting radio waves into electrical signals and vice versa. The antenna should be designed to consider the maximum power transmission possibility and efficiency. For this purpose, the antenna feed impedance must be matched to the load resistance. The antenna feed impedance is a combination of resistance, capacitance, and inductance. To ensure the maximum power transmission condition, the two impedances (load resistance and feed impedance) should be matched. The matching can be done by considering the frequency requirements and the design parameters of the antenna (e.g., gain, directivity, and radiation efficiency).

[0154] A feed line, also called a transmission line, refers to a connection line between a transceiver and a radiating body of an antenna. The transmission line can directly transmit current waves or electromagnetic waves according to different frequencies and forms. The connection between the radiating body and the transmission line is usually referred to as a feed point. The transmission line includes a wire transmission line, a coaxial transmission line, a waveguide, or a microstrip line, etc. The transmission line can include a support antenna body or a glass antenna body according to different implementation forms. The transmission line can be implemented by an LCP (Liquid Crystal Polymer), an FPC (Flexible Printed Circuit), or a PCB (Printed Circuit Board) according to different carriers.

[0155] Ground / ground plate, which can refer to at least a part of any ground layer, or ground plate, or ground metal layer, or any combination of the above in an electronic device (such as a mobile phone), can be used for grounding of components in the electronic device. In one embodiment, the ground / ground plate can include any one or more of the following: a ground layer of a circuit board of the electronic device, a ground plate formed by a middle frame of the electronic device, a ground metal layer formed by a metal film under the screen, a conductive ground layer of a battery, and a conductive or metal part electrically connected to the above ground layer / ground plate / metal layer. In one embodiment, the circuit board can be a printed circuit board (PCB), such as an 8-layer, 10-layer, or 12-14 layer board with 8, 10, 12, 13, or 14 layers of conductive material, or elements separated and electrically insulated by a dielectric or insulating layer such as glass fiber, polymer, etc. In one embodiment, the circuit board includes a dielectric substrate, a ground layer, and a trace layer, and the trace layer and the ground layer are electrically connected by a via. In one embodiment, components such as a display 120, a touch screen, an input button, a transmitter, a processor, a memory, a battery 140, 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 is provided on the trace layer.

[0156] Any ground layer, or ground plate, or ground metal layer described above is made of a conductive material. In one embodiment, the conductive material can be any one of the following materials: copper, aluminum, stainless steel, brass and their alloys, copper foil on an insulating substrate, aluminum foil on an insulating substrate, gold foil on an insulating substrate, silver-plated copper, silver-plated copper foil on an insulating substrate, silver foil on an insulating substrate, and tin-plated copper, graphite powder impregnated cloth, graphite coated substrate, copper plated substrate, brass plated substrate, and aluminum plated substrate. Those skilled in the art can understand that the ground layer / ground plate / ground metal layer can also be made of other conductive materials.

[0157] Ground: refers to coupling with the above-mentioned ground / floor by any means. In an embodiment, the ground can be through a physical ground, such as a physical ground through a part of the structure of the middle frame to realize the physical ground (or called physical ground) at a specific position on the edge frame. In an embodiment, the ground can be through a device ground, such as a device ground through capacitors / inductors / resistors and the like in series or parallel (or called device ground).

[0158] Resonant frequency: resonant frequency is also called resonance frequency. The resonant frequency can have a frequency range, that is, a frequency range in which resonance occurs. The resonant frequency can be a frequency range in which the return loss characteristic is less than -6 dB. The frequency corresponding to the strongest resonance point is the center frequency point frequency. The return loss characteristic of the center frequency can be less than -20 dB.

[0159] Resonant frequency band: the range of resonant frequencies is the resonant frequency band, and the return loss characteristic of any frequency point in the resonant frequency band can be less than -6 dB or -5 dB.

[0160] Communication frequency band / working frequency band: no matter what type of antenna, it always works in a certain frequency range (bandwidth). For example, an antenna supporting B40 frequency band, its working frequency band includes the frequency in the range of 2300MHz-2400MHz, or in other words, the working frequency band of the antenna includes the B40 frequency band. The frequency range that meets the index requirements can be regarded as the working frequency band of the antenna. The width of the working frequency band is called the working bandwidth. The working bandwidth of an omnidirectional antenna can reach 3-5% of the center frequency. The working bandwidth of a directional antenna can reach 5-10% of the center frequency. The bandwidth can be considered as a certain frequency range on both sides of the center frequency (for example, the resonant frequency of a dipole), in which the antenna characteristics are within the acceptable value range of the center frequency.

[0161] The resonant frequency band and the working frequency band can be the same, or can partially overlap. In an embodiment, one or more resonant frequency bands of an antenna can cover one or more working frequency bands of the antenna.

[0162] Electric length: the electric length can refer to the physical length (i.e. mechanical length or geometric length) multiplied by the ratio of the transmission time of an electric or electromagnetic signal in a medium to the time required for this signal to pass through the same distance in free space as the physical length of the medium, and the electric length can satisfy the following formula:

[0163] Wherein, L is the physical length, a is the transmission time of an electric or electromagnetic signal in a medium, and b is the transmission time in free space.

[0164] Alternatively, the electrical length can also refer to the ratio of the physical length (i.e. mechanical length or geometric length) to the wavelength of the electromagnetic wave being transmitted, and the electrical length can satisfy the following formula:

[0165] where L is the physical length and λ is the wavelength of the electromagnetic wave.

[0166] In some embodiments of the present application, the physical length of the radiator can be understood as being within ±20%, or within ±10%, or within ±5% of the electrical length of the radiator.

[0167] In embodiments of the present application, the wavelength in a certain wavelength mode (e.g. half-wavelength mode) of an antenna can refer to the wavelength of the signal radiated by the antenna. For example, the half-wavelength mode of a suspended metal antenna can produce a resonance at the 1.575 GHz frequency band, and the wavelength in the half-wavelength mode refers to the wavelength of the signal radiated by the antenna at the 1.575 GHz frequency band.

[0168] Wavelength: or operating wavelength, can refer to the wavelength corresponding to the center frequency of the resonance frequency or the center frequency of the operating frequency band supported by the antenna. For example, assuming that the center frequency of the B1 uplink frequency band (resonance frequency of 1920-1980 MHz) is 1955 MHz, the operating wavelength can be the wavelength calculated using the frequency of 1955 MHz. Without being limited to the center frequency, the "operating wavelength" can also refer to the wavelength corresponding to a non-center frequency of the resonance frequency or the operating frequency band.

[0169] It should be understood that the wavelength of the radiated signal in air can be calculated as follows: (air wavelength, or vacuum wavelength) = speed of light / frequency, where the frequency is the frequency (MHz) of the radiated signal, and the speed of light can be taken as 3 x 10 8 m / s. The wavelength of the radiated signal in a medium can be calculated as follows: where ε is the relative permittivity of the medium. The wavelength in embodiments of the present application generally refers to the medium wavelength, which can be the medium wavelength corresponding to the center frequency of the resonance frequency or the center frequency of the operating frequency band supported by the antenna. For example, assuming that the center frequency of the B1 uplink frequency band (resonance frequency of 1920-1980 MHz) is 1955 MHz, the wavelength can be the medium wavelength calculated using the frequency of 1955 MHz. Without being limited to the center frequency, the "medium wavelength" can also refer to the medium wavelength corresponding to a non-center frequency of the resonance frequency or the operating frequency band. For ease of understanding, the medium wavelength mentioned in embodiments of the present application can be simply calculated by the relative permittivity of the medium filled on one side or multiple sides of the radiator.

[0170] End / point: the "end / point" in the first end / second end / feed end / ground end / feed point / ground point / connection point of an antenna radiator, cannot be understood as a point or end that is physically disconnected from other radiators, but can also be considered as a point or section on a continuous radiator. In an embodiment, the "end / point" can include a connection / coupling area on the antenna radiator that is coupled to other conductive structures, for example, the feed end / feed point can be a coupling area (for example, an area that faces a part of the feed circuit) on the antenna radiator that is coupled to a feed structure or feed circuit, and for another example, the ground end / ground point can be a connection / coupling area on the antenna radiator that is coupled to a ground structure or ground circuit.

[0171] Open end, closed end: in some embodiments, the open end and the closed end are, for example, relative to whether they are grounded, the closed end is grounded, and the open end is not grounded. In some embodiments, the open end and the closed end are, for example, relative to other conductive bodies, 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 a suspended end, a free end, an open end, or an open circuit end. In an embodiment, the closed end can also be referred to as a grounded end or a short circuit end. It should be understood that in some embodiments, other conductive bodies can be coupled to the open end to transfer coupled energy (which can be understood as transferring current).

[0172] In some embodiments, the understanding of the "closed end" can also be from the perspective of current distribution, the closed end or the grounded end, etc. can be understood as a current large point on the radiator, or as a small point of electric field on the radiator; in an embodiment, coupling electronic devices (such as capacitors, inductors, etc.) through the closed end can not change the current distribution characteristics of the current large point / small point of electric field; in an embodiment, opening a slit (for example, a gap filled with insulating material) at or near the closed end can not change the current distribution characteristics of the current large point / small point of electric field.

[0173] In some embodiments, the understanding of the "open end" can also be from the perspective of current distribution, the open end or the suspended end, etc. can be understood as a current small point on the radiator, or as a large point of electric field on the radiator; in an embodiment, coupling electronic devices (such as capacitors, inductors, etc.) through the open end can not change the current distribution characteristics of the current small point / large point of electric field.

[0174] It should be understood that coupling electronic devices (such as capacitors, inductors, etc.) to the radiator end at a gap (similar to the open end or the suspended end of the radiator at the opening) can make the radiator end a current large point / small point of electric field, in which case it should be understood that the radiator end at the gap is actually a closed end or a grounded end, etc.

[0175] The middle or middle position of the conductor mentioned in the embodiments of the present application refers to a certain range. For example, the middle of the conductor can be a conductor portion including a midpoint on the conductor, or a conductor portion of one eighth wavelength including the midpoint of the conductor, where the wavelength can be a wavelength corresponding to an operating frequency band of the antenna, a wavelength corresponding to a center frequency of the operating frequency band, or a wavelength corresponding to a resonance point. For another example, the middle of the conductor can be a conductor portion on the conductor away from the midpoint by less than a predetermined threshold (for example, 1 mm, 2 mm, or 2.5 mm). The middle position of the slot or the middle position of one side of the slot refers to the middle position of one side of the slot.

[0176] The colinear, coaxial, coplanar, symmetric (for example, axisymmetric or centrosymmetric), parallel, perpendicular, same (for example, same length, same width, and the like) and the like mentioned in the embodiments of the present application are relative to the current process level, rather than the absolute definition in the mathematical sense. The edges of two radiating branches or two antenna units that are colinear can have a deviation of less than a predetermined threshold (for example, 1 mm, 0.5 m, or 0.1 mm) in the line width direction. The edges of two radiating branches or two antenna units that are coplanar can have a deviation of less than a predetermined threshold in a direction perpendicular to the coplanar plane thereof. Two antenna units that are parallel or perpendicular to each other can have a deviation of a predetermined angle. In an embodiment, the predetermined threshold can be less than or equal to a threshold of 1 mm, for example, the predetermined threshold can be 0.5 mm, or can be 0.1 mm. In an embodiment, the predetermined angle can be an angle within a range of ±10°, for example, the predetermined angle deviation is ±5°.

[0177] The current co-directional / directional distribution mentioned in the embodiments of the present application should be understood as the direction of the main current on the same side of the conductor being co-directional / counter-directional. For example, when co-directional current (for example, the current path is also bent or annular) is excited on the conductor in a bent shape or an annular shape, it should be understood that, for example, the main currents excited on the conductors on both sides of the annular conductor (for example, the conductors surrounding a gap, on both sides of the gap) are counter-directional in terms of direction, but still belong to the definition of co-directional current in the present application. In an embodiment, the co-directional current on one conductor can mean that the current on the conductor has no reversal point. In an embodiment, the counter-directional current on one conductor can mean that the current on the conductor has at least one reversal point. In an embodiment, the co-directional current on two conductors can mean that the currents on the two conductors have no reversal point and flow in the same direction. In an embodiment, the counter-directional current on two conductors can mean that the currents on the two conductors have no reversal point and flow in opposite directions. The co-directional / counter-directional current on multiple conductors can be understood accordingly.

[0178] Antenna pattern: also called radiation pattern. It refers to the relative field strength (normalized modulus) of the antenna radiation field at a certain distance from the antenna, which changes with direction. It is usually represented by two mutually perpendicular plane patterns through the maximum radiation direction of the antenna.

[0179] The antenna pattern usually has multiple radiation beams. The radiation beam with the maximum intensity is called the main lobe, and the remaining radiation beams are called side lobes or side lobes. In the side lobe, the side lobe in the opposite direction of the main lobe is also called the back lobe.

[0180] Beam width: divided into horizontal beam width and vertical beam width. Among them, the horizontal beam width refers to the angle between the two directions on both sides of the maximum radiation direction in the horizontal direction, at which the radiation power decreases by 3dB; the vertical beam width refers to the angle between the two directions on both sides of the maximum radiation direction in the vertical direction, at which the radiation power decreases by 3dB.

[0181] Antenna gain: used to characterize the degree of concentration of input power radiation by the antenna. Generally, the narrower the main lobe of the antenna pattern, the smaller the side lobe, and the higher the antenna gain.

[0182] System efficiency: refers to the ratio of the power radiated by the antenna into space (i.e. the power effectively converted into electromagnetic waves) to the input power of the antenna. The system efficiency is the actual efficiency after considering the antenna port matching, that is, the system efficiency of the antenna is the actual efficiency (i.e. efficiency) of the antenna.

[0183] Radiation efficiency: refers to the ratio of the power radiated by the antenna into space (i.e. the power effectively converted into electromagnetic waves) to the active power input to the antenna. Among them, the active power input to the antenna = the input power of the antenna - the 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. Metal loss, dielectric loss are the influencing factors of radiation efficiency.

[0184] As can be understood by those skilled in the art, efficiency is generally expressed in percentage, and there is a corresponding conversion relationship between efficiency and dB. The closer the efficiency is to 0dB, the better the efficiency of the antenna is characterized.

[0185] dB: decibel, a logarithmic concept with a base of ten. Decibel is only used to evaluate the ratio between one physical quantity and another physical quantity, and it itself has no physical dimension. The ratio between the two quantities increases by 10 times, and their difference can be expressed as 10 decibels. For example: A="100", B="10", C="5", D="1", then A / D=20dB; B / D=10dB; C / D=7dB; B / C=3dB. That is, a difference of 10 decibels between two quantities is a difference of 10 times, a difference of 20 decibels is a difference of 100 times, and so on. A difference of 3dB is a difference of 2 times between two quantities.

[0186] dBi: Generally mentioned together with dBd. dBi and dBd are units of power gain, both are relative values, but the reference bases are different. The reference base of dBi is omnidirectional antenna; the reference base of dBd is dipole. It is generally considered that dBi and dBd represent the same gain, and the value represented by dBi is 2.15dBi larger than that represented by dBd. For example: for an antenna with a gain of 16dBd, its gain converted into dBi is 18.15dBi, generally ignoring the decimal place, it is 18dBi.

[0187] Antenna return loss: It can be understood as the ratio of the signal power reflected back to the antenna port through the antenna circuit to the antenna port transmission power. The smaller the reflected signal, the greater the signal radiated through the antenna to the space, and the greater the radiation efficiency of the antenna. The greater the reflected signal, the smaller the signal radiated through the antenna to the space, and the smaller the radiation efficiency of the antenna.

[0188] The antenna return loss can be represented by S11 parameter, and S11 belongs to one of S parameters. S11 represents the reflection coefficient, and this parameter can represent the advantages and disadvantages of the antenna transmission efficiency.

[0189] In one embodiment, the S11 graph can be understood as a schematic diagram for representing the resonance generated by the antenna. In one embodiment, the resonance shown in the S11 graph in the part less than -6dB can be understood as the resonance frequency / frequency range / working frequency band generated by the antenna. The S11 parameter is usually negative, and the smaller the S11 parameter, the smaller the antenna return loss, the smaller the energy reflected back by the antenna itself, that is, the more the energy actually entering the antenna, and the higher the system efficiency of the antenna; the larger the S11 parameter, the larger the antenna return loss, and the lower the system efficiency of the antenna.

[0190] It should be noted that in engineering, -6dB is generally taken as the standard for S11 value, and when the S11 value of the antenna is less than -6dB, it can be considered that the antenna can work normally, or it can be considered that the transmission efficiency of the antenna is better.

[0191] Smith chart is a calculation chart in which a family of normalized input impedance (or admittance) circles is plotted on a complex plane of reflection. Smith chart is mainly used for impedance matching of transmission lines. The circular lines in the chart represent the real value of reactance, i.e. resistance value, and the horizontal line in the middle and the lines diverging upward and downward represent the imaginary value of impedance, i.e. the resistance value generated by capacitance or inductance at high frequency, in which the upward is positive and the downward is negative. The point in the middle of the chart (1+j0) represents a resistance value of impedance matching, and the value of its reflection coefficient will be zero. The edge of the chart represents the length of its reflection coefficient is 1, i.e. 100% reflection. The numbers on the edge of the chart represent the angle (0-180 degrees) and wavelength (from zero to half a wavelength) of the reflection coefficient.

[0192] Embodiments of the present application provide an electronic device, which can include a mobile phone, a tablet computer, a notebook computer, a remote information processor, and the like. The electronic device includes an antenna assembly (antenna), through which wireless communication between the electronic device and a communication base station, other electronic devices, a satellite, and the like can be achieved.

[0193] Referring to FIG. 1, in an implementation in which the electronic device 10 includes a mobile phone, the mobile phone includes a middle frame 11, a display panel 12, and a mainboard 13. The middle frame 11 includes a middle plate 14 and a bezel 15 surrounding the outer periphery of the middle plate 14. The bezel 15 is surrounded to form a mounting cavity, and the mainboard 13 is disposed in the mounting cavity. The display panel 12 is covered on the bezel 15 to enclose the mounting cavity. The display panel 12 is electrically connected to the mainboard 13 to control the display panel 12 to display images through the mainboard 13. The antenna assembly can be disposed on the bezel 15. For example, the antenna assembly can be in an integrated structure with the bezel 15, i.e. part of the bezel 15 serves as the antenna assembly. Of course, the antenna assembly can also be mounted on the bezel 15 by means of a patch, a bolt connection, or the like. Embodiments of the present application do not limit this.

[0194] In embodiments of the present application, the electronic device 10 further includes a radio frequency device. The radio frequency device is coupled to the antenna assembly, and can feed radio frequency signals to the antenna assembly so that the antenna assembly can emit signals to the outside world. For example, the radio frequency device can include a radio frequency chip or the like capable of emitting radio frequency signals. In the implementation in which the electronic device 10 includes a mobile phone, the radio frequency device can be disposed on the mainboard 13.

[0195] Referring to FIG. 2, the antenna assembly in the embodiment of the present application includes a floor 120 and a radiator 110 disposed on the floor 120. The radiator 110 can be located at one end (the upper end in the orientation shown in FIG. 2) of the floor 120, and the floor 120 is configured to assist the radiator 110 in transmitting signals. For example, in an implementation in which the electronic device 10 includes a mobile phone, the floor 120 can include the middle plate 14 (as shown in FIG. 1), or the floor 120 can include a ground layer on the main plate 13, or the floor 120 can include a ground layer on the display panel 12. Of course, the floor 120 can also be other ground structures, and the embodiment of the present application does not limit the floor 120.

[0196] It can be understood that the antenna assembly can be classified as a slot antenna (slit antenna) and a wire antenna according to the structure of the radiator. As shown in FIG. 2, in an embodiment in which the antenna assembly is a slot antenna, the radiator 110 and the floor 120 have a first slit 113 therebetween. The first slit 113 can be filled with a material having a certain dielectric constant, or the first slit 113 can also be left unfilled, i.e., the first slit 113 can be filled with air. Along the extension direction of the radiator 110, both ends of the radiator 110 are grounded. For example, both ends of the radiator 110 can be coupled to the floor 120, so that both ends of the radiator 110 are grounded. The extension direction of the radiator 110 can be the length direction of the radiator 110. For example, in the orientation shown in FIG. 2, the extension direction of the radiator 110 is substantially horizontal. The radiator 110 is provided with a second slit 114 that is in communication with the first slit 113. The second slit 114 cuts off the radiator 110 along the vertical direction (the vertical direction in the orientation shown in FIG. 2) of the extension direction of the radiator 110.

[0197] In the embodiment of the present application, the antenna assembly further includes a matching circuit 130. The radiator 110 is provided with a feed point b, and the matching circuit 130 is coupled to the feed point b and the radio frequency device. The matching circuit 130 can feed radio frequency signals from the radio frequency device into the radiator 110. The matching circuit 130 can include a capacitor and / or an inductor. The matching circuit 130 causes the antenna assembly to generate a first resonance and a second resonance, and the resonance frequency of the first resonance is less than the resonance frequency of the second resonance.

[0198] Continuing to refer to FIG. 2, in the embodiment of the present application, the antenna assembly further includes a slit capacitor 115. The radiator 110 at both ends of the second slit 114 is coupled through the slit capacitor 115. The slit capacitor 115 can adjust the resonance frequency of the first resonance and the resonance frequency of the second resonance, so that the difference between the resonance frequency of the first resonance and the resonance frequency of the second resonance is less than or equal to 2 GHz. The resonance frequency of the first resonance covers a first communication frequency band, and the resonance frequency of the second resonance covers a second communication frequency band. In the first communication frequency band and the second communication frequency band, the antenna assembly can perform normal wireless communication.

[0199] In some implementations, the length of the radiator 110 along the extending direction of the radiator 110 can be about half of the wavelength corresponding to the resonant frequency of the second resonance. In this way, the length of the radiator 110 can be reduced while the second resonance meets the high frequency requirement. Meanwhile, the resonant frequency of the first resonance can be adjusted by the gap capacitance 115 so that the difference between the resonant frequency of the first resonance and the resonant frequency of the second resonance is less than or equal to 2 GHz.

[0200] It can be understood that the difference between the resonant frequency of the first resonance and the resonant frequency of the second resonance is less than 2 GHz, so that the first communication frequency band and the second communication frequency band cover different communication frequency bands, thereby increasing the bandwidth of the antenna assembly. For example, the first communication frequency band can cover the WiFi frequency band, and the second communication frequency band can cover the cellular communication frequency band; or the first communication frequency band covers the Bluetooth frequency band, and the second communication frequency band covers the cellular communication frequency band. The embodiments of the present application do not limit the two communication frequency bands covered by the antenna assembly.

[0201] In the above implementations, the gap capacitance 115 can be a distributed capacitance. For example, the gap capacitance 115 can include the equivalent capacitance formed by the part of the radiator 110 at one end of the second gap 114, the part of the radiator 110 at the other end of the second gap 114, and the second gap 114. Of course, the gap capacitance 115 can also be a lumped capacitance. For example, the gap capacitance 115 can include a capacitor device, which can be arranged on the main plate 13 (as shown in FIG. 1). Of course, the capacitor device can also be arranged between the main plate 13 and the radiator 110.

[0202] For example, when the difference between the resonant frequency of the first resonance and the resonant frequency of the second resonance is less than or equal to 2 GHz and greater than or equal to 1.5 GHz, the capacitance value of the gap capacitance 115 is less than or equal to 2 pF; when the difference between the resonant frequency of the first resonance and the resonant frequency of the second resonance is less than 1.5 GHz, the capacitance value of the gap capacitance 115 is less than or equal to 5 pF. In this way, the difference between the resonant frequency of the first resonance and the resonant frequency of the second resonance is less than 2 GHz, while avoiding the capacitance value of the gap capacitance 115 being too large or too small. Of course, the impedance matching of the antenna assembly can also be performed by the gap capacitance 115.

[0203] In some embodiments, the first resonance includes a first sub-resonance and a second sub-resonance (dual resonance), and the second resonance can be a single resonance. That is, the resonant frequency of the first sub-resonance and the resonant frequency of the second sub-resonance together cover the first communication frequency band. In this way, the bandwidth of the first resonance can be increased, and the bandwidth of the antenna assembly can be further improved.

[0204] It can be understood that the resonance frequency of the first resonance can be a center frequency of the first sub-resonance and the second sub-resonance, which is a frequency corresponding to a midpoint between the center frequency of the first sub-resonance and the center frequency of the second sub-resonance.

[0205] With continuous reference to FIG. 2, in the above embodiment, the radiator 110 includes a midpoint a of the extension direction of the radiator 110. Along the extension direction of the radiator 110, the radiator 110 includes a first end (the left end in the orientation shown in FIG. 2) and a second end (the right end in the orientation shown in FIG. 2), both of which are ground ends. The second slot 114 can be arranged near the midpoint a, and correspondingly, the feed point b can be arranged between the midpoint a and the first end; or the second slot 114 is arranged between the midpoint a and the first end, and the feed point b is arranged between the midpoint a and the first end; or the second slot 114 is arranged between the midpoint a and the second end, and correspondingly, the feed point b can be arranged between the midpoint a and the first end, or the feed point b can be arranged between the midpoint a and the second end.

[0206] Please refer to FIG. 3, in the above implementation, the matching circuit 130 includes a first sub-matching circuit 131, the first sub-matching circuit 131 includes a first inductor L1 and a first capacitor C1, the first inductor L1 and the first capacitor C1 are connected in series; one end of the first capacitor C1 is coupled with the feed point b, the other end of the first capacitor C1 is coupled with one end of the first inductor L1, and the other end of the first inductor L1 can be coupled with the radio frequency device to receive the radio frequency signal. Alternatively, one end of the first inductor L1 is coupled with the feed point b, the other end of the first inductor L1 is coupled with one end of the first capacitor C1, and the other end of the first capacitor C1 is coupled with the radio frequency device to receive the radio frequency signal.

[0207] In some implementations, the resonance frequency of the second sub-resonance is greater than the resonance frequency of the first sub-resonance, or the resonance frequency of the second sub-resonance is less than the resonance frequency of the first sub-resonance, which is not limited by the embodiments of the present application. The embodiments of the present application will be introduced taking the resonance frequency of the second sub-resonance being greater than the resonance frequency of the first sub-resonance as an example.

[0208] With continuous reference to FIG. 2, in the above embodiment, under the first sub-resonance and the second sub-resonance, the current directions on the radiator 110 are the same; under the second resonance, the radiator 110 has a first small current point c, and the current directions on the two sides of the first small current point c are opposite. In this way, under the first sub-resonance and the second sub-resonance, the mode of the antenna assembly is the same, which is the common mode (CM mode for short); under the second resonance, the antenna assembly is in the differential mode (DM mode for short). It can be understood that the first small current point c can be a position where the current on the radiator 110 is close to zero.

[0209] As shown in FIG. 3, the second gap 114 is located near the midpoint a of the radiator 110, the feed point b is located between the midpoint a and the first end, the first sub-matching circuit 131 includes a first capacitor C1, a first inductor L1 and a first matching inductor L11, the first capacitor C1 is in series with the first inductor L1, one end of the first matching inductor L11 is coupled to the end of the first capacitor C1 away from the feed point b, and the other end of the first matching inductor L11 is grounded; wherein the capacitance value of the first capacitor C1 is 0.7 pH, the inductance value of the first inductor L1 is 7 nH, the inductance value of the first matching inductor L11 is 80 nH, the capacitance value of the gap capacitor 115 is 0.45 pH, and the length of the radiator 110 is 20 mm.

[0210] Please refer to FIG. 4, the curve M1 is the return loss curve corresponding to the antenna assembly shown in FIG. 3; M2 is the return loss curve corresponding to the antenna assembly shown in FIG. 3 without the first sub-matching circuit 131, i.e. the feed point b directly receives the radio frequency signal of the radio frequency device. Please refer to FIG. 5, Y1 is the impedance circle diagram of the antenna assembly shown in FIG. 3, and Y2 is the impedance circle diagram corresponding to the antenna assembly shown in FIG. 3 without the first sub-matching circuit 131. As shown in FIG. 4 and FIG. 5, the antenna assembly shown in FIG. 3 can generate a first sub-resonance, a second sub-resonance and a second resonance; wherein the resonance frequency of the first resonance is about 1.75 GHz, the resonance frequency of the second sub-resonance is about 2.1 GHz, and the resonance frequency of the second resonance can be about 4.4 GHz. FIG. 6 shows the current distribution of the antenna assembly shown in FIG. 3 under the first sub-resonance, the second sub-resonance and the second resonance; as shown in FIG. 6, under the first sub-resonance and the second sub-resonance, the current on the radiator 110 is co-directional current, and the antenna assembly is in CM mode (such as the first sub-resonance CM1 and the second sub-resonance CM2 in FIG. 5), and under the second resonance, the current direction on the radiator 110 is opposite, and the antenna assembly is in DM mode.

[0211] Please refer to FIG. 7, the curve K1 is the antenna efficiency curve corresponding to the antenna assembly shown in FIG. 3; K2 is the antenna efficiency curve corresponding to the antenna assembly shown in FIG. 3 without the first sub-matching circuit 131, i.e. the feed point b directly receives the radio frequency signal of the radio frequency device. As shown in FIG. 7, the antenna assembly in the embodiment of the present application has high efficiency under the first sub-resonance, the second sub-resonance and the second resonance, which ensures good communication quality.

[0212] In the embodiments of the present application, the difference between the resonant frequency of the first sub-resonance and the resonant frequency of the second sub-resonance can be adjusted by adjusting the position of the feeding point b. FIG. 8 is a structural schematic diagram of the antenna assembly shown in FIG. 3 after the feeding point b is moved 3 mm towards the first end (the left end), and FIG. 9 is a structural schematic diagram of the antenna assembly shown in FIG. 3 after the feeding point b is moved 2 mm towards the second end (the right end). Referring to FIG. 10, in FIG. 10, M1 is the return loss curve of the antenna assembly shown in FIG. 3, M2 is the return loss curve of the antenna assembly shown in FIG. 9, and M3 is the return loss curve of the antenna assembly shown in FIG. 8. Y1-Y3 in FIG. 11 are impedance circle diagrams of the antenna assemblies shown in FIG. 3, FIG. 9 and FIG. 8 respectively. As shown in FIG. 10 and FIG. 11, as the distance between the feeding point b and the first end decreases, the difference between the resonant frequency of the first sub-resonance and the resonant frequency of the second sub-resonance decreases, and at the same time, the impedance circle diagram shrinks. As the distance between the feeding point b and the first end increases, the difference between the resonant frequency of the first sub-resonance and the resonant frequency of the second sub-resonance increases, and at the same time, the impedance circle diagram diverges. K1-K3 in FIG. 12 are antenna efficiency curves of the antenna assemblies shown in FIG. 3, FIG. 9 and FIG. 8 respectively. As shown in FIG. 12, as the feeding point b moves, the antenna assembly has a high efficiency at the first sub-resonance, the second sub-resonance and the second resonance, thereby ensuring good communication quality.

[0213] In some implementations, the distance between the feeding point b and the first end is less than or equal to one third of the length of the radiator 110, so that the difference between the resonant frequency of the first sub-resonance and the resonant frequency of the second sub-resonance is less than or equal to 150 MHz. In this way, the first sub-resonance and the second sub-resonance can be close to each other, thereby ensuring the communication quality in the communication frequency band corresponding to the first resonance. On the other hand, the resonant frequency of the first sub-resonance and the resonant frequency of the second sub-resonance can both be located in the corresponding communication frequency band.

[0214] In the embodiments of the present application, the difference between the resonant frequency of the first sub-resonance and the resonant frequency of the second sub-resonance, and the difference between the resonant frequency of the first resonance and the resonant frequency of the second resonance can be adjusted by adjusting the position of the second slit 114. FIG. 13 is a schematic diagram of the structure of the antenna assembly after the second slit 114 is moved 4 mm from the midpoint a to the first end, and FIG. 14 is a schematic diagram of the structure of the antenna assembly after the second slit 114 is moved 4 mm from the midpoint a to the second end. Referring to FIG. 15, in FIG. 15, M1 is the return loss curve when the second slit 114 is located near the midpoint a, M2 is the return loss curve of the antenna assembly shown in FIG. 12, and M3 is the return loss curve of the antenna assembly shown in FIG. 13. Referring to FIG. 16, in FIG. 16, Y1 is the impedance circle diagram when the second slit 114 is located near the midpoint a, Y2 is the impedance circle diagram of the antenna assembly shown in FIG. 12, and Y3 is the impedance circle diagram of the antenna assembly shown in FIG. 13. As can be seen from FIG. 15 and FIG. 16, as the distance between the second slit 114 and the first end decreases, the circle diagram of the first resonance decreases, the difference between the resonant frequency of the first sub-resonance and the resonant frequency of the second sub-resonance decreases, the circle diagram of the second resonance does not change significantly, and the difference between the resonant frequency of the first resonance and the resonant frequency of the second resonance is basically unchanged. As the distance between the second slit 114 and the first end increases, the circle diagram of the first resonance diverges, the difference between the resonant frequency of the first sub-resonance and the resonant frequency of the second sub-resonance increases, the circle diagram of the first resonance decreases, and the difference between the resonant frequency of the first resonance and the resonant frequency of the second resonance decreases. In FIG. 17, K1-K3 are respectively the antenna efficiency curves when the second slit 114 is located near the midpoint a, the second slit 114 is moved 4 mm from the midpoint a to the first end, and the second slit 114 is moved 4 mm from the midpoint a to the second end. As can be seen from FIG. 17, as the second slit 114 moves, the antenna assembly has high efficiency at the first sub-resonance, the second sub-resonance, and the second resonance, thereby ensuring good communication quality.

[0215] In some implementations, the distance between the second slit 114 and the midpoint a is less than or equal to one fourth of the length of the radiator 110. For example, the feed point b and the second slit 114 can both be located between the midpoint a and the first end, and the distance between the second slit 114 and the midpoint a is less than or equal to one fourth of the length of the radiator 110; or the feed point b is located between the midpoint a and the first end, the second slit 114 is located between the midpoint a and the second end, and the distance between the second slit 114 and the midpoint a is less than or equal to one fourth of the length of the radiator 110. In this way, the difference between the resonant frequency of the first resonance and the resonant frequency of the second resonance can be moderate.

[0216] Please refer to FIG. 18, which is a return loss diagram of the antenna assembly shown in FIG. 3 when the slot capacitance 115 is different. In FIG. 18, M1 is a return loss curve when the slot capacitance 115 is not provided, and M2-M5 are return loss curves when the slot capacitance 115 is 0.25 pF, 0.45 pF, 0.65 pF, and 100 pF, respectively. In FIG. 19, K1 is an antenna efficiency curve when the slot capacitance 115 is not provided, and K2-K4 are antenna efficiency curves when the slot capacitance 115 is 0.25 pF, 0.45 pF, and 0.65 pF, respectively. As can be seen from FIGS. 18 and 19, as the slot capacitance 115 gradually decreases, both the first sub-resonance and the second sub-resonance shift to a high frequency, and the second resonance is basically unchanged. In addition, as can be seen from FIG. 19, when the slot capacitance 115 is not too large, the antenna assembly still has a relatively high antenna efficiency, thereby ensuring that the antenna assembly has good communication performance.

[0217] In some embodiments, the first resonance is a single resonance, and the second resonance includes a third sub-resonance and a fourth sub-resonance (double resonance), the resonant frequency of the fourth sub-resonance is greater than the resonant frequency of the third sub-resonance, and the resonant frequency band of the third sub-resonance and the resonant frequency band of the fourth sub-resonance collectively cover the second resonant frequency band, thereby increasing the bandwidth of the second resonance and further increasing the bandwidth of the antenna assembly.

[0218] It can be understood that the resonant frequency of the second resonance can be a center frequency of the third sub-resonance and the fourth sub-resonance, which is a frequency corresponding to a midpoint between the center frequency of the third sub-resonance and the center frequency of the fourth sub-resonance.

[0219] Please refer to FIG. 20. In the above embodiments, the feeding point b is located on one side of the midpoint a, and the second slot 114 is located on the other side of the midpoint a. For example, the second slot 114 is provided between the midpoint a and the second end of the radiator 110, and the feeding point b is provided between the midpoint a and the first end of the radiator 110.

[0220] The matching circuit 130 includes a second sub-matching circuit 132, which includes a second capacitor C2 and a second inductor L2. One end of the second inductor L2 is coupled to the feeding point b, one end of the second capacitor C2 is connected to one end of the second inductor L2, the other end of the second capacitor C2 is grounded, and the other end of the second inductor L2 is configured to receive a radio frequency signal, so that the second resonance is a double resonance.

[0221] In the above embodiments, under the first resonance, the current directions on the radiator 110 are the same, and the antenna assembly is in a CM mode; under the third sub-resonance and the fourth sub-resonance, the radiator 110 has a first small current point c, the current directions on the two sides of the first small current point c are opposite, the modes of the third sub-resonance and the fourth sub-resonance are the same, and both are in a DM mode.

[0222] As shown in FIG. 20, the second sub-matching circuit 132 includes a second inductor L2, a second capacitor C2, and a second matching inductor L21, one end of the second matching inductor L21 is coupled with the feeding point b, the other end of the second matching inductor L21 is coupled with the second capacitor C2 and one end of the second inductor L2, the other end of the second inductor L2 is configured to receive the radio frequency signal, and the other end of the second capacitor C2 is configured to be grounded. In this embodiment, the inductance value of the second matching inductor L21 is 7.5 nH, the point capacitance value of the second capacitor C2 is 0.3 pF, the inductance value of the second inductor L2 is 6 nH, the capacitance value of the gap capacitor 115 is 0.45 pF, and the length of the radiator 110 is 20 mm. FIG. 21 is a return loss diagram of the antenna assembly shown in FIG. 20, and FIG. 22 is an impedance circle diagram of the antenna assembly shown in FIG. 20. As shown in FIGS. 21 and 22, the first resonance frequency of the antenna assembly is about 1.85 GHz, the third sub-resonance frequency is about 4.3 GHz, and the fourth sub-resonance frequency is about 4.7 GHz. FIG. 23 is an antenna efficiency diagram of the antenna assembly shown in FIG. 20. As shown in FIG. 23, the antenna assembly has a high antenna efficiency at the first resonance, the third sub-resonance, and the fourth sub-resonance, so that the antenna assembly has good communication performance.

[0223] FIG. 24 is a current distribution diagram of the antenna assembly shown in FIG. 20 at the first resonance, the third sub-resonance, and the fourth sub-resonance. As shown in FIG. 24, at the first resonance, the current directions on the radiator 110 are the same, and the antenna assembly is in the CM mode. At the third sub-resonance and the fourth sub-resonance, the radiator 110 has a first small current point c, the current directions on the two sides of the first small current point c are opposite, and the antenna assembly is in the DM mode (such as the third sub-resonance DM1 and the fourth sub-resonance DM2 in FIG. 22).

[0224] In the above embodiment, by adjusting the position of the feeding point b, the difference between the third sub-resonance frequency and the fourth sub-resonance frequency can be adjusted. For example, the distance between the feeding point b and the first end is less than or equal to one third of the length of the radiator 110, so that the difference between the third sub-resonance frequency and the fourth sub-resonance frequency is less than or equal to 500 MHz. In this way, the third sub-resonance and the fourth sub-resonance can be close to each other, thereby ensuring the communication quality in the communication frequency band corresponding to the second resonance. On the other hand, the third sub-resonance frequency and the fourth sub-resonance frequency can also be located in the corresponding communication frequency band.

[0225] In some embodiments, the first resonance and the second resonance are both double resonances, that is, the first resonance includes a first sub-resonance and a second sub-resonance, and the second resonance includes a third sub-resonance and a fourth sub-resonance. The first sub-resonance and the second sub-resonance jointly cover the first communication frequency band to increase the bandwidth of the first resonance, and the third sub-resonance and the fourth sub-resonance jointly cover the second communication frequency band to increase the bandwidth of the second resonance. Through the above arrangement, the bandwidths of the first resonance and the second resonance can be increased, and the bandwidth of the antenna assembly is further increased.

[0226] Please refer to FIG. 25, in the above implementation manner, the matching circuit 130 can include a first sub-matching circuit and a second sub-matching circuit. The second slot 114 is located between the midpoint a and the second end, and the feed point b is located between the first end and the midpoint a. The distance between the second slot 114 and the midpoint a is less than or equal to one fourth of the length of the radiator 110, and the distance between the feed point b and the first end is less than or equal to one third of the length of the radiator 110.

[0227] As shown in FIG. 26, in the matching circuit 130, the first sub-matching circuit includes a first capacitor C1 and a first inductor L1, and the second sub-matching circuit includes a second capacitor C2, a second inductor L2 and a second matching inductor L21. One end of the first inductor L1 is coupled with the feed point b, the other end of the first inductor L1 is coupled with one end of the first capacitor C1 through the second inductor L2, and the other end of the first capacitor C1 is used for receiving the radio frequency signal. One end of the second capacitor C2 is coupled with the other end of the first inductor L1, and the other end of the second capacitor C2 is grounded. One end of the second matching inductor L21 is coupled with one end of the first capacitor C1, and the other end of the second matching inductor L21 is grounded. The capacitance value of the first capacitor C1 is 0.7 pF, the capacitance value of the second capacitor C2 is 0.3 pF, the inductance value of the first inductor L1 is 5.5 nH, the inductance value of the second inductor L2 is 8.5 nH, the inductance value of the second matching inductor L21 is 20 nH, the capacitance value of the slot capacitor 115 is 0.45 pF, and the length of the radiator 110 is 20 mm.

[0228] FIG. 27 is a return loss diagram of the antenna assembly shown in FIG. 26, and FIG. 28 is an impedance circle diagram of the antenna assembly shown in FIG. 26. As shown in FIG. 27, the resonant frequency of the first sub-resonance is about 1.7 GHz, the resonant frequency of the second sub-resonance is about 1.9 GHz, the resonant frequency of the third sub-resonance is about 4.4 GHz, and the resonant frequency of the fourth sub-resonance is about 4.8 GHz. FIG. 29 is an antenna efficiency diagram of the antenna assembly shown in FIG. 26. As shown in FIG. 29, the antenna assembly has a high antenna efficiency under the first sub-resonance, the second sub-resonance, the third sub-resonance and the fourth sub-resonance, so that the antenna assembly has good communication performance.

[0229] Figure 30 is a current distribution diagram of the antenna assembly shown in Figure 26 under the first sub-resonance, the second sub-resonance, the third sub-resonance, and the fourth sub-resonance. As shown in Figure 30, under the first sub-resonance, the current on the radiator 110 is a co-current, i.e., the mode of the antenna assembly is a CM mode; under the second sub-resonance, the current on the radiator 110 is a co-current, i.e., the mode of the antenna assembly is a CM mode; under the third sub-resonance, the radiator 110 has a first small current point c, and the current directions on the two sides of the first small current point c are opposite, i.e., the mode of the antenna assembly is a DM mode; under the fourth sub-resonance, the radiator 110 has a first small current point c, and the current directions on the two sides of the first small current point c are opposite, i.e., the mode of the antenna assembly is a DM mode.

[0230] Figure 31 is a structural schematic diagram of the antenna assembly after the feed point b is moved 3 mm towards the second end. Referring to Figure 32, M1 is a return loss curve of the antenna assembly when the feed point b in Figure 26 is located at the initial position, M2 is a return loss curve of the antenna assembly (as shown in Figure 31) after the feed point b is moved 3 mm from the initial position towards the second end, and M3 is a return loss curve of the antenna assembly after the feed point b in Figure 26 is moved 6 mm from the initial position towards the second end. Referring to Figure 33, K1 is an antenna efficiency curve of the antenna assembly when the feed point b in Figure 26 is located at the initial position, K2 is an antenna efficiency curve of the antenna assembly after the feed point b is moved 3 mm from the initial position towards the second end, and K3 is an antenna efficiency curve of the antenna assembly after the feed point b in Figure 26 is moved 6 mm from the initial position towards the second end. As shown in Figures 31-33, as the feed point b moves towards the second end, the difference between the resonance frequencies of the first sub-resonance and the second sub-resonance gradually increases, the difference between the resonance frequencies of the third sub-resonance and the fourth sub-resonance gradually increases, i.e., the difference between the resonance frequency of the first resonance and the resonance frequency of the second resonance gradually increases; after the feed point b is moved towards the second end, the antenna assembly still has a high antenna efficiency, which ensures that the antenna assembly has good communication performance.

[0231] Figure 34 is a schematic diagram of the structure of the antenna assembly after the second slot 114 is moved 3 mm from the midpoint a to the second end. Referring to Figure 35, Ml is the return loss curve of the antenna assembly when the second slot 114 is in the initial position, M2 is the return loss curve of the antenna assembly when the second slot 114 is moved 3 mm from the initial position to the first end, M3 is the return loss curve of the antenna assembly when the second slot 114 is moved 6 mm from the initial position to the first end, and M4 is the return loss curve of the antenna assembly when the second slot 114 is moved 3 mm from the initial position to the second end (as shown in Figure 34). Referring to Figure 36, K1 is the antenna efficiency curve of the antenna assembly when the second slot 114 is in the initial position, K2 is the antenna efficiency curve of the antenna assembly when the second slot 114 is moved 3 mm from the initial position to the first end, K3 is the antenna efficiency curve of the antenna assembly when the second slot 114 is moved 6 mm from the initial position to the first end, and K4 is the antenna efficiency curve of the antenna assembly when the second slot 114 is moved 3 mm from the initial position to the second end. As shown in Figures 34-36, as the second slot 114 moves to the first end, the difference between the resonance frequencies of the first and second sub-resonances gradually decreases, and the difference between the resonance frequencies of the third and fourth sub-resonances gradually increases. As the second slot 114 moves to the second end, the difference between the resonance frequencies of the first and second sub-resonances gradually increases, and the difference between the resonance frequencies of the third and fourth sub-resonances gradually decreases. In addition, as shown in Figure 36, regardless of whether the second slot 114 moves to the first end or the second end, the antenna assembly still has a high antenna efficiency, ensuring that the antenna assembly has good communication performance.

[0232] Referring to Figure 37, Ml is the return loss curve of the antenna assembly shown in Figure 26, and M2-M4 are the return loss curves of the antenna assembly shown in Figure 26 when the length of the radiator 110 between the second slot 114 and the first end is increased by 1.5 mm, increased by 3 mm, and decreased by 1.5 mm, respectively. In Figure 38, K1 is the antenna efficiency curve of the antenna assembly shown in Figure 26, and K2-K4 are the antenna efficiency curves of the antenna assembly shown in Figure 26 when the length of the radiator 110 between the second slot 114 and the first end is increased by 1.5 mm, increased by 3 mm, and decreased by 1.5 mm, respectively. As shown in Figures 37 and 38, the length of the radiator 110 between the second slot 114 and the first end affects the first and third sub-resonances, and has less effect on the second and fourth sub-resonances. As the length of the radiator 110 between the second slot 114 and the first end increases, the resonance frequencies of the first and third sub-resonances gradually shift to lower frequencies. In addition, as shown in Figure 38, the antenna assembly still has a high antenna efficiency as the length of the radiator 110 between the second slot 114 and the first end changes, ensuring that the antenna assembly has good communication performance.

[0233] Referring to FIG. 39, M1 is a return loss curve of the antenna assembly shown in FIG. 26, and M2-M4 are return loss curves of the antenna assembly shown in FIG. 26 with the radiating body 110 between the second slot 114 and the second end shortened by 1.5 mm, shortened by 3 mm, and lengthened by 1.5 mm, respectively. Referring to FIG. 40, K1 is an antenna efficiency curve of the antenna assembly shown in FIG. 26, and K2-K4 are antenna efficiency curves of the antenna assembly shown in FIG. 26 with the radiating body 110 between the second slot 114 and the second end shortened by 1.5 mm, shortened by 3 mm, and lengthened by 1.5 mm, respectively. As shown in FIGS. 39 and 40, the length of the radiating body 110 between the second slot 114 and the second end affects the second sub-resonance and the fourth sub-resonance, and has little effect on the first sub-resonance and the third sub-resonance; as the length of the radiating body 110 between the second slot 114 and the second end increases, the resonance frequencies of the second sub-resonance and the fourth sub-resonance gradually shift to low frequencies. In addition, as shown in FIG. 40, the antenna assembly still has a high antenna efficiency as the length of the radiating body 110 between the second slot 114 and the second end changes, ensuring that the antenna assembly has good communication performance.

[0234] Referring to FIG. 41, FIG. 41 is a return loss diagram of the antenna assembly with different slot capacitances 115 (shown in FIG. 26), in which M1 is a return loss curve without the slot capacitance 115, and M2-M5 are return loss curves with the slot capacitance 115 taking 0.25 pF, 0.45 pF, 0.65 pF, and 100 pF, respectively. Referring to FIG. 42, K1 is an antenna efficiency curve without the slot capacitance 115, and K2-K5 are antenna efficiency curves with the slot capacitance 115 taking 0.25 pF, 0.45 pF, 0.65 pF, and 100 pF, respectively. As shown in FIGS. 41 and 42, as the slot capacitance 115 gradually decreases, each sub-resonance shifts to high frequencies. In addition, as shown in FIG. 42, the antenna assembly still has a high antenna efficiency when the slot capacitance 115 has a small value, ensuring that the antenna assembly has good communication performance.

[0235] Referring to FIG. 43, in some embodiments, both ends (left end and right end) of the radiating body 110 along its extension direction are open ends, i.e., the first end (left end) and the second end (right end) of the radiating body 110 are open ends, and accordingly, the antenna assembly is a wire antenna. The matching circuit 130 is coupled to the feed point b on the radiating body 110 to feed a signal to the feed point b. The matching circuit 130 can make the antenna assembly generate a first resonance and a second resonance, and the resonance frequency of the first resonance is smaller than the resonance frequency of the second resonance.

[0236] In the above implementation, the antenna assembly further includes a grounding inductor 116, one end of the grounding inductor 116 is coupled with the grounding point e on the radiator 110, and the other end of the grounding inductor 116 is configured to be grounded. In this way, the difference between the resonant frequency of the first resonance and the resonant frequency of the second resonance is less than or equal to 2 GHz.

[0237] In some implementations, along the extension direction of the radiator 110, the length of the radiator 110 can be about half of the wavelength corresponding to the resonant frequency of the second resonance. In this way, the length of the radiator 110 can be reduced, while the second resonance meets the high frequency requirement; at the same time, the first resonance can be adjusted by the grounding inductor 116, so that the difference between the resonant frequency of the first resonance and the resonant frequency of the second resonance is less than or equal to 2 GHz.

[0238] It can be understood that the difference between the resonant frequency of the first resonance and the resonant frequency of the second resonance is less than 2 GHz, and the first communication frequency band and the second communication frequency band cover different communication frequency bands, thereby increasing the bandwidth of the antenna assembly. For example, the first communication frequency band can cover the WiFi frequency band, and the second communication frequency band can cover the cellular communication frequency band; or the first communication frequency band covers the Bluetooth frequency band, and the second communication frequency band covers the cellular communication frequency band. The two communication frequency bands covered by the antenna assembly are not limited in the embodiments of the present application.

[0239] In the above implementation, the grounding inductor 116 can be a distributed inductor. For example, the grounding inductor 116 can include a conductor (such as a metal sheet, a wire, etc.) with a certain inductance between the ground plate 120 and the radiator 110. Of course, the grounding inductor 116 can also be a lumped inductor. For example, the grounding inductor 116 can include an inductor device, which can be arranged on the main board 13. Of course, the inductor device can also be arranged between the main board 13 and the radiator 110.

[0240] For example, when the difference between the resonant frequency of the first resonance and the resonant frequency of the second resonance is less than or equal to 2 GHz and greater than or equal to 1.5 GHz, the inductance value of the grounding inductor 116 is less than or equal to 3 nH; when the difference between the resonant frequency of the first resonance and the resonant frequency of the second resonance is less than 1.5 GHz, the inductance value of the grounding inductor 116 is less than or equal to 5 nH. In this way, the inductance value of the grounding inductor 116 is moderate. Of course, the impedance matching of the antenna assembly can also be performed by the grounding inductor 116.

[0241] In some embodiments, the first resonance includes a first sub-resonance and a second sub-resonance (dual resonance), and correspondingly, the second resonance can be a single resonance; that is, the resonant frequency of the first sub-resonance and the resonant frequency of the second sub-resonance together cover the first communication frequency band. In this way, the bandwidth of the first resonance can be increased, and the bandwidth of the antenna assembly can be further improved.

[0242] It can be understood that the resonance frequency of the first resonance can be a center frequency of the first sub-resonance and the second sub-resonance, the center frequency being a frequency corresponding to a midpoint between the resonance frequency of the first sub-resonance and the resonance frequency of the second sub-resonance.

[0243] In the above embodiment, the radiator 110 includes a midpoint a of the extending direction of the radiator 110, along the extending direction of the radiator 110, the radiator 110 includes a first end and a second end, both of which are open ends, the feed point b and the grounding point e can be located on the radiator 110 between the midpoint a and the first end, and the feed point b is located between the first end and the midpoint a.

[0244] Please refer to FIG. 44, in the above implementation, the matching circuit 130 includes a first sub-matching circuit 131, the first sub-matching circuit 131 includes a first inductor L1 and a first capacitor C1, the first inductor L1 is connected with the first capacitor C1 in series. For example, one end of the first capacitor C1 can be coupled with the feed point b, the other end of the first capacitor C1 is coupled with one end of the first inductor L1, and the other end of the first inductor L1 is used for receiving the radio frequency signal. Alternatively, one end of the first inductor L1 is coupled with the feed point b, the other end of the first inductor L1 is coupled with one end of the first capacitor C1, and the other end of the first capacitor C1 is used for receiving the radio frequency signal.

[0245] In some implementations, the resonance frequency of the second sub-resonance is greater than the resonance frequency of the first sub-resonance, of course, the resonance frequency of the second sub-resonance can also be less than the resonance frequency of the first sub-resonance, and the embodiments of the present application do not limit this. The embodiments of the present application will be introduced taking the resonance frequency of the second sub-resonance being greater than the resonance frequency of the first sub-resonance as an example.

[0246] Continuing to refer to FIG. 43, in the above embodiment, under the first sub-resonance and the second sub-resonance, the radiator 110 has a second small current point d, the current directions on the radiator 110 on both sides of the second small current point d are opposite; under the second resonance, the current directions on the radiator 110 are the same. In this way, under the first sub-resonance and the second sub-resonance, the mode of the antenna assembly is the same, which is the DM mode; under the second resonance, the antenna assembly is in the CM mode. It can be understood that the second small current point d can be a position where the current on the radiator 110 is close to zero.

[0247] As shown in FIG. 44, the distance between the grounding point e and the midpoint a is 4 mm, and the feeding point b is located between the midpoint a and the first end; the first sub-matching circuit 131 includes a first inductor L1, a first capacitor C1, and a first matching inductor L11, one end of the first capacitor C1 is coupled with the feeding point b, the other end of the first capacitor C1 is coupled with one end of the first inductor L1, the other end of the first inductor L1 receives the radio frequency signal, and the other end of the first inductor L1 is further grounded through the first matching inductor L11. In this embodiment, the inductance value of the grounding inductor 116 is 1 nH, the inductance value of the first inductor L1 is 7.5 nH, the inductance value of the first matching inductor L11 is 10 nH, and the capacitance value of the first capacitor C1 is 0.5 pF. Please refer to FIG. 45, which is the return loss curve of the antenna assembly shown in FIG. 44. As shown in FIG. 45, the antenna assembly can generate a first sub-resonance, a second sub-resonance, and a second resonance; wherein the resonant frequency of the first resonance can be about 1.9 GHz, the resonant frequency of the second sub-resonance can be about 2.4 GHz, and the resonant frequency of the second resonance can be about 5.1 GHz. FIG. 46 is the antenna efficiency curve of the antenna assembly shown in FIG. 44. As shown in FIG. 46, the antenna assembly in the present embodiment has a high efficiency at the first sub-resonance, the second sub-resonance, and the second resonance, ensuring good communication quality.

[0248] FIG. 47 is the current distribution diagram of the antenna assembly shown in FIG. 46 at the first sub-resonance, the second sub-resonance, and the second resonance. As shown in FIG. 47, at the first sub-resonance and the second sub-resonance, the antenna assembly is in CM mode, and at the second resonance, the current on the radiator 110 is the same-direction current, and the antenna assembly is in DM mode.

[0249] In the above implementation, by adjusting the position of the grounding point e, the difference between the resonant frequencies of the first sub-resonance and the second sub-resonance can be adjusted. As the grounding point e moves towards the first end, that is, as the distance between the grounding point e and the midpoint a increases, the difference between the resonant frequencies of the first sub-resonance and the second sub-resonance decreases, and at the same time, the resonant frequency of the first resonance shifts towards low frequency.

[0250] In some implementations, the difference between the resonant frequencies of the first sub-resonance and the second sub-resonance can also be adjusted by adjusting the position of the grounding point e. For example, the distance between the feeding point b and the first end is less than or equal to one third of the length of the radiator 110; so that the difference between the resonant frequencies of the first sub-resonance and the second sub-resonance is less than or equal to 150 MHz. In this way, the first sub-resonance and the second sub-resonance can be made close to each other, thereby ensuring the communication quality in the first resonance frequency band; on the other hand, the resonant frequencies of the first sub-resonance and the second sub-resonance can also be located within the corresponding communication frequency band.

[0251] In the above embodiment, the distance between the feeding point b and the grounding point e is less than or equal to one-eighth of the length of the radiator 110, and the distance between the grounding point e and the midpoint a is less than or equal to three-eighths of the length of the radiator 110. In this way, the difference between the resonant frequency of the first sub-resonance and the resonant frequency of the second sub-resonance is moderate.

[0252] In some embodiments, the first resonance is a single resonance, and the second resonance includes a third sub-resonance and a fourth sub-resonance (double resonance), the resonant frequency of the fourth sub-resonance is greater than the resonant frequency of the third sub-resonance, and the resonant frequency band of the third sub-resonance and the resonant frequency band of the fourth sub-resonance together cover the second resonant frequency band, thereby increasing the bandwidth of the second resonance and further increasing the bandwidth of the antenna assembly.

[0253] It can be understood that the resonant frequency of the second resonance can be the center frequency of the third sub-resonance and the fourth sub-resonance, which is the frequency corresponding to the midpoint between the resonant frequency of the third sub-resonance and the resonant frequency of the fourth sub-resonance.

[0254] Please refer to FIG. 48, in the above embodiment, the feeding point b can be located on the radiator 110 between the midpoint a and the first end, and the grounding point e is located between the midpoint a and the second end. The matching circuit 130 includes a second sub-matching circuit 132, the second sub-matching circuit 132 includes a second capacitor C2 and a second inductor L2, the second capacitor C2 and the second inductor L2 can be connected in series, and the present embodiment does not limit the second sub-matching circuit 132, as long as it can make the second resonance be a double resonance.

[0255] In some implementations, the resonant frequency of the fourth sub-resonance is greater than the resonant frequency of the third sub-resonance, of course, the resonant frequency of the fourth sub-resonance can also be less than the resonant frequency of the third sub-resonance, and the present embodiment does not limit this. The present embodiment will be introduced with the example that the resonant frequency of the fourth sub-resonance is greater than the resonant frequency of the third sub-resonance.

[0256] In the above embodiment, under the third sub-resonance and the fourth sub-resonance, the current direction on the radiator 110 is the same; under the first resonance, the radiator 110 has a second small current point d, and the current directions on the two sides of the second small current point d are opposite. In this way, under the first resonance, the antenna assembly is in CM mode; under the third sub-resonance and the fourth sub-resonance, the mode of the antenna assembly is the same, which is DM mode.

[0257] As shown in FIG. 48, the grounding point e is located between the midpoint a and the second end, the distance between the grounding point e and the center is 4 mm, the feeding point b is located between the midpoint a and the first end, and the second capacitor C2 and the second inductor L2 in the first sub matching circuit 131 are connected in series. Among them, the capacitance value of the second capacitor C2 is 0.5 pF, the inductance value of the second inductor L2 is 3 nH, and the inductance value of the grounding inductor 116 is 1 nH. Please refer to FIG. 49, which is the return loss curve of the antenna assembly shown in FIG. 48. The antenna assembly can generate a first resonance, a third sub resonance and a fourth resonance. Among them, the resonance frequency of the first resonance can be about 1.65 GHz, the resonance frequency of the third sub resonance can be about 3.7 GHz, and the resonance frequency of the fourth sub resonance can be about 5 GHz. FIG. 50 is an antenna efficiency curve of the antenna assembly shown in FIG. 48. As shown in FIG. 50, the antenna assembly in the embodiment of the present application has high efficiency at the first resonance, the third sub resonance and the fourth sub resonance, which ensures good communication quality.

[0258] FIG. 51 is a current distribution diagram of the antenna shown in FIG. 48 at the first sub resonance, the third sub resonance and the fourth sub resonance. As shown in FIG. 51, at the first resonance, the radiator 110 has a second small current point d, the current directions on both sides of the second small current point d are opposite, and the antenna assembly is in CM mode; at the third sub resonance and the fourth sub resonance, the current on the radiator 110 is a unidirectional current, and the antenna assembly is in DM mode.

[0259] In the above implementation manner, by adjusting the position of the grounding point e, the difference between the resonance frequencies of the third sub resonance and the fourth sub resonance can be adjusted. As the grounding point e moves towards the second end, that is, as the distance between the grounding point e and the midpoint a increases, the difference between the resonance frequencies of the third sub resonance and the fourth sub resonance decreases, and at the same time, the resonance frequency of the second resonance shifts to high frequency.

[0260] In some implementation manners, the difference between the resonance frequencies of the third sub resonance and the fourth sub resonance can also be adjusted by adjusting the position of the feeding point b. For example, the distance between the feeding point b and the first end is less than or equal to one third of the length of the radiator 110; so that the difference between the resonance frequency of the third sub resonance and the resonance frequency of the fourth sub resonance is less than or equal to 500 MHz. In this way, the third sub resonance and the fourth sub resonance can be made close to each other, thereby ensuring the communication quality in the second resonance frequency band; on the other hand, the resonance frequency of the third sub resonance and the resonance frequency of the fourth sub resonance can also be located in the corresponding communication frequency band.

[0261] In some embodiments, both the first resonance and the second resonance are double resonances, that is, the first resonance includes a first sub-resonance and a second sub-resonance, and the second resonance includes a third sub-resonance and a fourth sub-resonance. The first sub-resonance and the second sub-resonance jointly cover the first resonant frequency band to increase the bandwidth of the first resonance, and the third sub-resonance and the fourth sub-resonance jointly cover the second resonant frequency band to increase the bandwidth of the second resonance. Through the above arrangement, the bandwidths of the first resonance and the second resonance can be increased, and the bandwidth of the antenna assembly is further increased.

[0262] Please refer to FIG. 52a. In the implementation mode in which both the first resonance and the second resonance are double resonances, the feeding point b and the grounding point e can be located on the radiating body 110 between the midpoint a and the first end, and the feeding point b is located between the first end and the midpoint a. The matching circuit 130 includes a first sub-matching circuit and a second sub-matching circuit, so that both the first resonance and the second resonance are double resonances.

[0263] In the above implementation mode, the distance between the feeding point b and the grounding point e is less than or equal to one-eighth of the length of the radiating body 110, and the distance between the grounding point e and the midpoint a is less than or equal to three-eighths of the length of the radiating body 110. In this way, the difference between the resonant frequency of the first sub-resonance and the resonant frequency of the second sub-resonance is moderate, and the difference between the resonant frequency of the third sub-resonance and the resonant frequency of the fourth sub-resonance is also moderate.

[0264] As shown in FIG. 52b, in some embodiments, the grounding inductance 116 can be multiple, and the radiating body 110 includes multiple grounding points e which are arranged at intervals along the extension direction of the radiating body 110, and each grounding point e is coupled with one grounding inductance 116. By arranging multiple grounding inductances 116, the antenna aperture of the antenna assembly can be increased.

[0265] As shown in FIG. 53, the distance between the grounding point e and the midpoint a is 5 mm, the feeding point b is located between the midpoint a and the first end, the matching circuit 130 includes a first sub-matching circuit, a second sub-matching circuit, a first matching inductance L11 and a second matching inductance L12, one end of the first inductance L1 is coupled with the feeding point b, the other end of the first inductance L1 is coupled with one end of the second inductance L2, the other end of the first inductance L1 is also grounded through the second capacitor C2, the other end of the second inductance L2 is coupled with one end of the first capacitor C1, the other end of the second inductance L2 is also grounded through the first matching inductance L11, the other end of the first capacitor C1 receives the radio frequency signal, and the other end of the first capacitor C1 is also grounded through the second matching inductance L12. Among them, the inductance value of the first inductance L1 is 4 nH, the inductance value of the second inductance L2 is 8 nH, the inductance value of the first matching inductance L11 is 35 nH, the inductance value of the second matching inductance L12 is 10 nH, the capacitance value of the first capacitor C1 is 0.5 pF, the capacitance value of the second capacitor C2 is 0.3 pF, and the inductance value of the grounding inductance 116 is 1 nH.

[0266] Please refer to Figure 54, Figure 54 is the return loss curve of the antenna assembly shown in Figure 53, the antenna assembly can generate a first sub-resonance, a second sub-resonance, a third sub-resonance and a fourth sub-resonance; wherein the resonant frequency of the first resonance can be about 1.85 GHz, the resonant frequency of the second sub-resonance can be about 2.25 GHz, the resonant frequency of the third sub-resonance can be about 4.8 GHz, and the resonant frequency of the fourth sub-resonance can be about 5.6 GHz. Figure 55 is the antenna efficiency curve of the antenna assembly shown in Figure 54. As can be seen from Figure 55, the antenna assembly in the embodiment of the application has high efficiency at the first sub-resonance, the second sub-resonance, the third sub-resonance and the fourth sub-resonance, ensuring good communication quality.

[0267] Figure 56 is the current distribution diagram of the antenna assembly shown in Figure 43 at the first sub-resonance, the second sub-resonance, the third sub-resonance and the fourth sub-resonance. As can be seen from Figure 56, at the first sub-resonance and the second sub-resonance, the current directions on both sides of the second small current point d on the radiator 110 are opposite, and the antenna assembly is in CM mode; at the third sub-resonance and the fourth sub-resonance, the current on the radiator 110 is unidirectional current, and the antenna assembly is in DM mode.

[0268] Please refer to Figure 57, in some embodiments, the floor 120 includes adjacent first side edge 121 and second side edge 122, the radiator 110 includes the first branch 111 opposite to the first side edge 121 and the second branch 112 opposite to the second side edge 122. That is, the radiator 110 is arranged at the corner of the floor 120, which can make full use of the space of the floor 120 and improve the structural compactness of the electronic device 10.

[0269] As shown in FIG. 57, the midpoint a of the radiator 110 can be located at the corner position, the grounding point e is located between the midpoint a and the first end (the left end), the distance between the grounding point e and the midpoint a is 4 mm, the feeding point b is located between the midpoint a and the first end, the matching circuit 130 includes a first sub-matching circuit 131, the first sub-matching circuit 131 includes a first inductor L1 and a first capacitor C1, one end of the first inductor L1 is coupled with the feeding point b, one end of the first capacitor C1 is coupled with the other end of the first inductor L1, and the other end of the first capacitor C1 is configured to receive a radio frequency signal. Wherein, the inductance value of the first inductor L1 is 8.5 nH, the capacitance value of the first capacitor C1 is 0.6 pF, and the inductance value of the grounding inductor 116 is 0.7 nH. FIG. 58 is a return loss curve of the antenna assembly shown in FIG. 57, and FIG. 59 is an impedance circle diagram of the antenna assembly shown in FIG. 57. As shown in FIG. 58 and FIG. 59, the antenna assembly can generate a first sub-resonance, a second sub-resonance and a second resonance, the resonant frequency of the first resonance can be about 1.65 GHz, the resonant frequency of the second sub-resonance can be about 2.15 GHz, and the resonant frequency of the second resonance can be about 3.95 GHz. Please refer to FIG. 60, which is an antenna efficiency curve of the antenna assembly shown in FIG. 57. As shown in FIG. 60, the antenna assembly in the embodiment of the application has a high efficiency at the first sub-resonance, the second sub-resonance and the second resonance, which ensures good communication quality.

[0270] FIG. 61 is a current distribution diagram of the antenna assembly shown in FIG. 57 at the first sub-resonance, the second sub-resonance and the second resonance. As shown in FIG. 61, at the first sub-resonance and the second sub-resonance, the current directions on both sides of the second small current point d on the radiator 110 are opposite, and the antenna assembly is in CM mode; at the second resonance, the current on the radiator 110 is a unidirectional current, and the antenna assembly is in DM mode.

[0271] As shown in FIG. 62, the grounding point e is located between the midpoint a and the second end, the distance between the grounding point e and the midpoint a is 4 mm, the feeding point b is located between the midpoint a and the first end, the matching circuit 130 includes the second sub-matching circuit 132, the first matching inductor L11, the first matching capacitor C11 and the second matching capacitor C12, one end of the second inductor L2 is coupled with the feeding point b, one end of the second inductor L2 is further grounded through the second capacitor C2, the other end of the second inductor L2 is coupled with one end of the first matching capacitor C11, one end of the first matching capacitor C11 is further grounded through the second matching capacitor C12, the other end of the first matching capacitor C11 receives the radio frequency signal, and the other end of the first matching capacitor C11 is further grounded through the first matching inductor L11. Wherein, the inductance value of the first matching inductor L11 is 10nH, the inductance value of the second inductor L2 is 3.2nH, the inductance value of the grounding inductor 116 is 1nH, the capacitance value of the first matching capacitor C11 is 0.6pF, the capacitance value of the second matching capacitor C12 is 0.5pF, and the capacitance value of the second capacitor C2 is 1.2pF. Please refer to FIG. 63 and FIG. 64, FIG. 63 is the return loss curve of the antenna assembly shown in FIG. 62, and FIG. 64 is the impedance circle diagram of the antenna assembly shown in FIG. 62. As shown in FIG. 63 and FIG. 64, the antenna assembly can generate the first resonance, the third sub-resonance and the fourth resonance, the resonance frequency of the first resonance can be about 1.85GHz, the resonance frequency of the third sub-resonance can be about 3.25GHz, and the resonance frequency of the second resonance can be about 3.65GHz. Please refer to FIG. 65, which is the antenna efficiency curve of the antenna assembly shown in FIG. 62. As shown in FIG. 65, the antenna assembly in the embodiment of the application has high efficiency at the first sub-resonance, the second sub-resonance and the second resonance, which ensures good communication quality.

[0272] FIG. 66 is the current distribution diagram of the antenna assembly shown in FIG. 62 at the first resonance, the third sub-resonance and the fourth sub-resonance. As shown in FIG. 66, at the first resonance, the current directions on both sides of the second small current point d on the radiator 110 are opposite, and the antenna assembly is in CM mode; at the third sub-resonance and the fourth sub-resonance, the current on the radiator 110 is unidirectional current, and the antenna assembly is in DM mode.

[0273] As shown in FIG. 67, the grounding point e is located between the midpoint a and the second end, the distance between the grounding point e and the center is 4 mm, the feeding point b is located between the midpoint a and the first end, the second sub-matching circuit 132 includes a second capacitor C2, a second inductor L2 and a third inductor L3, one end of the second inductor L2 is coupled with the feeding point b, the other end of the second inductor L2 is coupled with one end of the second capacitor C2, the other end of the second capacitor C2 receives the radio frequency signal, and the other end of the second capacitor C2 is grounded through the third inductor L3. Wherein, the inductance value of the second inductor L2 is 4.5 nH, the inductance value of the third inductor L3 is 10 nH, the capacitance value of the second capacitor C2 is 0.5 pF, and the inductance value of the grounding inductor 116 is 0.7 nH. Please refer to FIG. 68 and FIG. 69, FIG. 68 is a return loss curve of the antenna assembly shown in FIG. 67, and FIG. 69 is an impedance circle diagram of the antenna assembly shown in FIG. 67. As shown in FIG. 68 and FIG. 69, the antenna assembly can generate a first resonance, a third sub-resonance and a fourth sub-resonance, the resonance frequency of the first resonance can be about 1.85 GHz, the resonance frequency of the third sub-resonance can be about 3.2 GHz, and the resonance frequency of the fourth sub-resonance can be about 3.95 GHz. Please refer to FIG. 70, which is an antenna efficiency curve of the antenna assembly shown in FIG. 67. As shown in FIG. 70, the antenna assembly in the embodiment of the application has a high efficiency at the first resonance, the third sub-resonance and the fourth sub-resonance, which ensures good communication quality.

[0274] FIG. 71 is a current distribution diagram of the antenna shown in FIG. 67 at the first resonance, the third sub-resonance and the fourth sub-resonance. As shown in FIG. 71, at the first resonance, the current directions on both sides of the second small current point d on the radiator 110 are opposite, and the antenna assembly is in CM mode; at the third sub-resonance and the fourth sub-resonance, the current on the radiator 110 is unidirectional current, and the antenna assembly is in DM mode.

[0275] As shown in FIG. 72, the grounding point e is located between the midpoint a and the first end, the distance between the grounding point e and the midpoint a is 4 mm, the feeding point b is located between the midpoint a and the first end, the matching circuit 130 comprises a first sub-matching circuit, a second sub-matching circuit, a first matching inductor L11 and a second matching inductor L12, one end of the first inductor L1 is coupled with one end of the second inductor L2, the other end of the first inductor L1 is further grounded through the second capacitor C2, the other end of the second inductor L2 is coupled with the first capacitor C1, the other end of the second inductor L2 is further grounded through the first matching inductor L11, the other end of the first capacitor C1 receives the radio frequency signal, and the other end of the first capacitor C1 is further grounded through the second matching inductor L12. Wherein, the capacitance value of the first capacitor C1 is 0.55 pF, the capacitance value of the second capacitor C2 is 0.4 pF, the inductance value of the first inductor L1 is 4.5 nH, the inductance value of the second inductor L2 is 9 nH, the inductance value of the first matching inductor L11 is 30 nH, the inductance value of the second matching inductor L12 is 20 nH, and the inductance value of the grounding inductor 116 is 0.7 nH. Please refer to FIG. 73 and FIG. 74, FIG. 73 is a return loss curve of the antenna assembly shown in FIG. 72, and FIG. 74 is an impedance circle diagram of the antenna assembly shown in FIG. 72. As shown in FIG. 73 and FIG. 74, the antenna assembly can generate a first sub-resonance, a second sub-resonance, a third sub-resonance and a fourth resonance, the resonant frequency of the first sub-resonance can be about 1.7 GHz, the resonant frequency of the second sub-resonance can be about 2.05 GHz, the resonant frequency of the third sub-resonance can be about 3.7 GHz, and the resonant frequency of the fourth sub-resonance can be about 4.6 GHz. Please refer to FIG. 75, which is an antenna efficiency curve of the antenna assembly shown in FIG. 72. As shown in FIG. 75, the antenna assembly in the embodiment of the application has high efficiency at the first sub-resonance, the second sub-resonance and the second resonance, which ensures good communication quality.

[0276] FIG. 76 is a current distribution diagram of the antenna shown in FIG. 72 under the first sub-resonance, the second sub-resonance, the third sub-resonance and the fourth sub-resonance. As shown in FIG. 76, under the first sub-resonance and the second sub-resonance, the current directions on both sides of the second small current point d on the radiator 110 are opposite, and the antenna assembly is in CM mode; under the third sub-resonance and the fourth sub-resonance, the current on the radiator 110 is unidirectional current, and the antenna assembly is in DM mode.

[0277] Please refer to FIG. 77, in some implementations, the antenna assembly further comprises a first adjusting capacitor C31, one end of the first adjusting capacitor C31 is coupled with the first end, and the other end of the first adjusting capacitor C31 is configured to be grounded. In other implementations, the antenna assembly further comprises a first adjusting inductor L31, one end of the first adjusting inductor L31 is coupled with the first end, and the other end of the first adjusting inductor L31 is configured to be grounded.

[0278] Please refer to Figure 78, in which curve M1 is the return loss curve of the first end without the first adjusting capacitor C31 and the first adjusting inductor L31, M2 is the return loss curve of the first end grounded through the first adjusting capacitor C31, and M3 is the return loss curve of the first end grounded through the first adjusting inductor L31. As shown in Figure 78, the third sub-resonance and the fourth sub-resonance can be shifted to low frequency by the first adjusting capacitor C31, and the first sub-resonance and the second sub-resonance remain unchanged. The third sub-resonance and the fourth sub-resonance can be shifted to high frequency by the first adjusting inductor L31, and the first sub-resonance and the second sub-resonance remain unchanged.

[0279] Please refer to Figure 79, in which curve K1 is the antenna efficiency curve of the first end without the first adjusting capacitor C31 and the first adjusting inductor L31, K2 is the antenna efficiency curve of the first end grounded through the first adjusting capacitor C31, and K3 is the antenna efficiency curve of the first end grounded through the first adjusting inductor L31. As shown in Figure 79, the antenna assembly still has high efficiency after setting the first adjusting capacitor C31 and the first adjusting inductor L31, ensuring good communication quality.

[0280] Please refer to Figure 80. In some implementations, the antenna assembly further includes a second adjusting capacitor C41, one end of the second adjusting capacitor C41 being coupled to the second end, and the other end of the second adjusting capacitor C41 being configured to be grounded. In other implementations, the antenna assembly further includes a second adjusting inductor L41, one end of the second adjusting inductor L41 being coupled to the second end, and the other end of the second adjusting inductor L41 being configured to be grounded.

[0281] Please refer to Figure 81, in which curve M1 is the return loss curve of the second end without the second adjusting capacitor C41 and the second adjusting inductor L41, M2 is the return loss curve of the second end grounded through the second adjusting capacitor C41, and M3 is the return loss curve of the second end grounded through the second adjusting inductor L41. As shown in Figure 81, the first sub-resonance and the second sub-resonance can be shifted to low frequency by the second adjusting capacitor C41, and the third sub-resonance and the fourth sub-resonance remain unchanged. The first sub-resonance and the second sub-resonance can be shifted to high frequency by the second adjusting inductor L41, and the third sub-resonance and the fourth sub-resonance remain unchanged.

[0282] Please refer to Figure 82, in which K1 is the antenna efficiency curve when the second end is not provided with the second adjusting capacitor C41 and the second adjusting inductor L41, K2 is the antenna efficiency curve when the second end is grounded through the second adjusting capacitor C41, and K3 is the antenna efficiency curve when the second end is grounded through the second adjusting inductor L41. As shown in Figure 82, after the second adjusting capacitor C41 and the second adjusting inductor L41 are provided, the antenna assembly still has high efficiency, ensuring good communication quality.

[0283] Please refer to Figure 83, in which M1 is the return loss curve of the antenna assembly when the grounding point e is at the initial position between the midpoint a and the first end (as shown in Figure 72), M2 is the return loss curve when the grounding point e is moved 2 mm from the initial position to the midpoint a, and M3 is the return loss curve when the grounding point e is moved 4 mm from the initial position to the midpoint a. As shown in Figure 83, the resonance frequencies of the second sub-resonance and the third sub-resonance can be adjusted by the grounding point e, and the first sub-resonance and the fourth sub-resonance are basically unchanged; wherein as the grounding point e gradually approaches the midpoint a, the second sub-resonance gradually shifts to high frequency, and the third sub-resonance gradually shifts to low frequency.

[0284] Please refer to Figure 84, in which K1 is the antenna efficiency curve of the antenna assembly when the grounding point e is at the initial position between the midpoint a and the first end (as shown in Figure 72), K2 is the antenna efficiency curve when the grounding point e is moved 2 mm from the initial position to the midpoint a, and K3 is the antenna efficiency curve when the grounding point e is moved 4 mm from the initial position to the midpoint a. As shown in Figure 84, by adjusting the position of the grounding point e, the antenna assembly still has high efficiency, ensuring good communication quality.

[0285] Please refer to Figure 85, in which M1 is the return loss curve of the antenna assembly when the feeding point b is at the initial position between the midpoint a and the first end (as shown in Figure 72), M2 is the return loss curve when the feeding point b is moved 3 mm from the initial position to the midpoint a, and M2 is the return loss curve when the feeding point b is moved 5 mm from the initial position to the midpoint a. As shown in Figure 85, the resonance frequencies of the third sub-resonance and the fourth sub-resonance can be adjusted by the feeding point b, and the first sub-resonance and the second sub-resonance are basically unchanged; wherein as the feeding point b gradually approaches the midpoint a, the difference between the resonance frequency of the third sub-resonance and the resonance frequency of the fourth sub-resonance gradually increases.

[0286] Please refer to Figure 86, in which K1 is the antenna efficiency curve of the antenna assembly when the feeding point b is at the initial position between the midpoint a and the first end, K2 is the antenna efficiency curve when the feeding point b is moved 3 mm from the initial position to the midpoint a, and K3 is the return loss curve when the feeding point b is moved 5 mm from the initial position to the midpoint a. As shown in Figure 86, by adjusting the position of the feeding point b, the antenna assembly still has high efficiency, ensuring good communication quality.

[0287] Please refer to FIG. 87, where M1 is the return loss curve of the antenna assembly when the ground inductance 116 is 0.4nH, M2 is the return loss curve of the antenna assembly when the ground inductance 116 is 0.6nH, and M3 is the return loss curve of the antenna assembly when the ground inductance 116 is 1nH. As shown in FIG. 87, the resonant frequencies of the first and second sub-resonances can be adjusted by adjusting the ground inductance 116, while the third and fourth sub-resonances remain basically unchanged; and as the ground inductance 116 decreases, the first and second sub-resonances gradually shift to high frequencies.

[0288] Please refer to FIG. 88, where K1 is the antenna efficiency curve of the antenna assembly when the ground inductance 116 is 0.4nH, K2 is the antenna efficiency curve of the antenna assembly when the ground inductance 116 is 0.6nH, and K3 is the antenna efficiency curve of the antenna assembly when the ground inductance 116 is 1nH. As shown in FIG. 88, the antenna assembly still has high efficiency and ensures good communication quality by adjusting the size of the ground inductance 116.

[0289] Please refer to FIG. 89 and FIG. 90, where M1 is the return loss curve of the antenna assembly when the second adjusting inductance is not set and the radiator remains the original length, M2 is the return loss curve of the antenna assembly when the second adjusting inductance is set and the radiator remains the original length, and M3 is the return loss curve of the antenna assembly when the second adjusting inductance is not set and the radiator is lengthened. K1 is the antenna efficiency curve of the antenna assembly when the second adjusting inductance is not set and the radiator remains the original length, K2 is the antenna efficiency curve of the antenna assembly when the second adjusting inductance is set and the radiator remains the original length, and K3 is the antenna efficiency curve of the antenna assembly when the second adjusting inductance is not set and the radiator is lengthened. As shown in FIG. 89 and FIG. 90, the efficiency bandwidth of lengthening the radiator is better than that of setting the second adjusting inductance.

[0290] It should be understood that the "common mode" or "CM mode" in the embodiments of the present application includes a wire common mode and a slot common mode, and the "differential mode" or "DM mode" in the embodiments of the present application includes a wire differential mode and a slot differential mode, which can be determined according to the structure of the antenna.

[0291] 1. Wire (Wire) common mode (common mode, CM) mode

[0292] Figure 91 shows that the radiator 40 of the antenna is open at both ends, and is connected to the feed circuit (not shown in the figure) at the middle position 41. In one embodiment, the feed form of the radiator 40 adopts symmetrical feed. The feed circuit can be connected to the middle position 41 of the radiator 40 through the feed line 42. It should be understood that the symmetrical feed can be understood as that one end of the feed circuit is connected to the radiator, and the other end is coupled to the ground plane to realize grounding, wherein the connection point (feed point) of the feed circuit to the radiator 40 is located at the center of the radiator 40, and the center of the radiator 40 can be, for example, the midpoint of the geometric structure, or the midpoint of the electrical length (or a region within a certain range near the above-mentioned midpoint).

[0293] The middle position 41 of the radiator 40 can be, for example, the geometric center of the radiator, or the midpoint of the electrical length of the radiator. In one embodiment, the feed line 42 is connected to the radiator 40 through a connecting member such as a spring, and the connecting member is connected to the radiator 40 at a position covering the middle position 41.

[0294] Figure 92 shows the current and electric field distribution of the antenna. As shown in Figure 92, the current presents a reverse distribution, for example, a symmetrical distribution, on both sides of the middle position 41, and the electric field presents a same direction distribution on both sides of the middle position 41. As shown in Figure 92, the current at the feed line 42 presents a same direction distribution. Based on the same direction distribution of the current at the feed line 42, this kind of feed shown in Figures 91 and 92 can be called line CM feed. Based on the reverse distribution of the current on both sides of the radiator, this kind of antenna mode shown in Figure 92 can be called line CM mode (which can also be simply referred to as CM mode, for example, for a line antenna, the CM mode refers to the line CM mode). The current and electric field shown in Figure 92 can be respectively called the current and electric field of the line CM mode.

[0295] 2. Line differential mode (DM) mode

[0296] As shown in Figure 93, the left and right ends of the radiator 50 are open ends, and are connected to the feed circuit at the middle position 51. In one embodiment, the feed form of the radiator 50 adopts anti-symmetrical feed. One end of the feed circuit is connected to one part of the radiator 50 through the feed line 52, and the other end of the feed circuit is connected to another part of the radiator 50 through the feed line 52. The middle position 51 can include the geometric center of the radiator 50.

[0297] It should be understood that the "center anti-symmetrical feed" mentioned in the embodiments of the present application can be understood as that the positive and negative poles of the feed unit are respectively connected to the two connection points near the above-mentioned midpoint of the radiator. In one embodiment, the signal amplitudes output by the positive and negative poles of the feed unit are the same, and the phases are opposite, for example, the phases differ by 180°±10°.

[0298] Figure 94 shows the current and electric field distribution of the radiator 50. As shown in Figure 94, the current presents a same direction distribution, for example, an anti-symmetrical distribution, on both sides of the middle position 51 of the radiator 50; the electric field presents an opposite distribution on both sides of the middle position 51. As shown in Figure 94, the current at the feed line 52 presents an opposite distribution. Based on the opposite distribution of the current at the feed line 52, this kind of feed shown in Figure 93 can be referred to as a line DM feed. Based on the same direction distribution of the current on both sides of the radiator, this kind of antenna mode shown in Figure 94 can be referred to as a line DM mode (also can be simply referred to as a DM mode, for example, for a line antenna, the DM mode refers to a line DM mode). The current and electric field shown in Figure 94 can be referred to as the current and electric field of the line DM mode, respectively.

[0299] 3. Slot CM mode

[0300] Figure 95 shows that the radiator of the antenna has a hollow slot or gap 61, or can be regarded as that the radiator 60 of the antenna and the floor (for example, the ground layer of the PCB) enclose the slot or gap 61. In an embodiment, the slot 61 can be formed by slotting on the floor. In an embodiment, the slot 61 can be enclosed by coupling the two ends of the radiator 60 with the floor. The slot 61 is provided with an opening 62 on one side, and the opening 62 can be specifically opened at the middle position of the side. The middle position of the side of the slot 61 can be, for example, the geometric midpoint of the radiator 60, or the midpoint of the electrical length of the radiator, for example, the area where the opening 62 is opened on the radiator covers the middle position of the side. The opening 62 can be connected with a feed circuit, and an anti-symmetrical feed can be adopted. It should be understood that the anti-symmetrical feed can be understood as that the positive and negative poles of the feed circuit are connected to the two ends of the radiator, respectively. The signal amplitudes of the positive and negative poles of the feed circuit are the same, and the phases are opposite, for example, the phases are opposite by 180°±10°.

[0301] Figure 96 shows the current, electric field, and magnetic current distribution on the radiator 60 (may also include a ground plane). As shown in Figure 96, the current on the conductor (e.g., ground plane, and / or the radiator 60) around the slot 61 is co-directional around the slot 61, the electric field is anti-directional on both sides of the opening 61 of the slot 61, and the magnetic current is anti-directional on both sides of the middle of the slot 61. As shown in Figure 96, the electric field at the opening 62 (e.g., feed) is co-directional, and the magnetic current at the opening 62 (e.g., feed) is co-directional. Based on the co-directional magnetic current at the opening 62 (feed), this type of feed shown in Figure 96 can be referred to as a slot CM feed. Based on the co-directional current on the radiator on both sides of the opening 62 (e.g., anti-symmetrical distribution), or based on the co-directional current on the conductor around the slot 61 around the slot 61, this type of antenna mode shown in Figure 96 can be referred to as a slot CM mode (may also be referred to as CM mode, e.g., for a slot antenna, the CM mode refers to the slot CM mode). The electric field, current, and magnetic current distribution shown in Figure 96 can be referred to as the electric field, current, and magnetic current of the slot CM mode.

[0302] 4. Slot DM mode

[0303] As shown in Figure 97, the slot or gap 72 in the radiator of the antenna is hollow, or can be considered that the slot or gap 72 is enclosed by the radiator 70 and the ground plane (e.g., the ground plane of the PCB). In one embodiment, the slot 72 can be formed by cutting a slot in the ground plane. In one embodiment, the slot 72 can be enclosed by coupling the two ends of the radiator 70 to the ground plane. The middle of the slot 72 is connected to the feed circuit, and symmetric feeding is used. It should be understood that symmetric feeding can be understood as that one end of the feed circuit is connected to the radiator, and the other end is coupled to the ground plane to achieve grounding, wherein the connection point (feed point) of the feed circuit and the radiator is located at the center of the radiator, which can be, for example, the geometric midpoint, or the electrical length midpoint (or a region within a certain range of the above-mentioned midpoint). The middle of one side of the slot 72 is connected to the positive pole of the feed circuit, and the middle of the other side of the slot 72 is connected to the negative pole of the feed circuit. The middle of the side of the slot 72 can be, for example, the middle of the radiator 70 and / or the middle of the ground plane, such as the geometric midpoint of the radiator 70, or the electrical length midpoint of the radiator, for example, the connection of the feed circuit and the radiator covers the middle 71 of the side.

[0304] Figure 98 shows the current, electric field, and magnetic current distribution on the radiator 70 (may also include a floor). As shown in Figure 98, on the conductor (such as the floor, and / or the radiator 70) around the slot 72, the current is distributed around the slot 72, and is distributed in opposite directions on both sides of the middle position of the slot 72, the electric field is distributed in the same direction on both sides of the middle position 71, and the magnetic current is distributed in the same direction on both sides of the middle position 71. The magnetic current at the feeding circuit is distributed in opposite directions (not shown). Based on the magnetic current at the feeding circuit being distributed in opposite directions, this feeding shown in Figure 97 can be referred to as a slot DM feeding. Based on the current being distributed in opposite directions (for example, symmetrically) on both sides of the radiator 70, or, based on the current being distributed in opposite directions (for example, symmetrically) around the slot 71, this antenna mode shown in Figure 98 can be referred to as a slot DM mode (may also be referred to simply as a DM mode, for example, for a slot antenna, the DM mode refers to a slot DM mode). The electric field, current, and magnetic current distribution shown in Figure 98 can be referred to as the electric field, current, and magnetic current of the slot DM mode.

[0305] The above merely provides a specific implementation of the embodiments of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can easily think of changes or replacements within the technical range disclosed in the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. An antenna assembly, characterized by Comprising: a floor; a radiator disposed on the floor, the radiator having a first gap with the floor, both ends of the radiator along the extension direction of the radiator being grounded ends; the radiator is provided with a second gap in communication with the first gap; a matching circuit coupled with a feed point on the radiator, the matching circuit being configured to cause the antenna assembly to generate a first resonance and a second resonance, the first resonance having a resonance frequency less than the resonance frequency of the second resonance; wherein the first resonance includes a first sub-resonance and a second sub-resonance, and / or the second resonance includes a third sub-resonance and a fourth sub-resonance; a gap capacitor coupling the radiator at both ends of the second gap, the gap capacitor being configured to cause the difference between the resonance frequency of the first resonance and the resonance frequency of the second resonance to be less than or equal to 2 GHz.

2. The antenna assembly of claim 1, wherein, When the difference between the resonance frequency of the first resonance and the resonance frequency of the second resonance is less than or equal to 2 GHz and greater than or equal to 1.5 GHz, the capacitance value of the gap capacitor is less than or equal to 2 pF; when the difference between the resonance frequency of the first resonance and the resonance frequency of the second resonance is less than 1.5 GHz, the capacitance value of the gap capacitor is less than or equal to 5 pF.

3. The antenna assembly of claim 1 or 2, wherein, The first resonance includes the first sub-resonance and the second sub-resonance, and the matching circuit includes a first sub-matching circuit, the first sub-matching circuit including a first inductor and a first capacitor, the first inductor and the first capacitor being connected in series.

4. The antenna assembly of claim 3, wherein, The resonance frequency of the second sub-resonance is greater than the resonance frequency of the first sub-resonance.

5. The antenna assembly of any of claims 1-4, wherein, The second resonance includes the third sub-resonance and the fourth sub-resonance, and the matching circuit includes a second sub-matching circuit, the second sub-matching circuit including a second capacitor and a second inductor, one end of the second inductor being coupled with the feed point, one end of the second capacitor being connected with one end of the second inductor, the other end of the second capacitor being grounded, and the other end of the second inductor being configured to receive a radio frequency signal.

6. The antenna assembly of claim 5, wherein, The radiator includes a midpoint in the extension direction thereof, the feed point being located on one side of the midpoint, and the second gap being located on the other side of the midpoint.

7. The antenna assembly of claim 5 or 6, wherein, The resonance frequency of the fourth sub-resonance is greater than the resonance frequency of the third sub-resonance.

8. The antenna assembly of any of claims 1-7, wherein, The radiator includes a midpoint in the extension direction thereof, and the distance between the second gap and the midpoint is less than or equal to one fourth of the length of the radiator.

9. The antenna assembly of any of claims 1-8, wherein, The radiator includes a first end and a second end, the feed point and the second gap being located between the first end and the second end, and the feed point being located between the second gap and the first end; the distance between the feed point and the first end is less than or equal to one third of the length of the radiator. So that the difference between the resonance frequency of the first sub-resonance and the resonance frequency of the second sub-resonance is less than or equal to 150 MHz; or so that the difference between the resonance frequency of the third sub-resonance and the resonance frequency of the fourth sub-resonance is less than or equal to 500 MHz.

10. An antenna assembly, characterized by Comprising: a floor; a radiator disposed on the floor, both ends of the radiator along its extending direction are open ends; a matching circuit coupled with a feed point on the radiator, the matching circuit is configured to cause the antenna assembly to generate a first resonance and a second resonance, the first resonance has a resonance frequency smaller than a resonance frequency of the second resonance; wherein the first resonance includes a first sub-resonance and a second sub-resonance, and / or the second resonance includes a third sub-resonance and a fourth sub-resonance; a grounding inductor, one end of the grounding inductor is coupled with a grounding point on the radiator, the other end of the grounding inductor is grounded, the grounding inductor is configured to cause a difference between the resonance frequency of the first resonance and the resonance frequency of the second resonance to be less than or equal to 2 GHz.

11. The antenna assembly of claim 10, wherein, when the difference between the resonance frequency of the first resonance and the resonance frequency of the second resonance is less than or equal to 2 GHz and greater than or equal to 1.5 GHz, the inductance value of the grounding inductor is less than or equal to 3 nH; when the difference between the resonance frequency of the first resonance and the resonance frequency of the second resonance is less than 1.5 GHz, the inductance value of the grounding inductor is less than or equal to 5 nH.

12. The antenna assembly of claim 10 or 11, wherein, the first resonance includes the first sub-resonance and the second sub-resonance, the matching circuit includes a first sub-matching circuit, the first sub-matching circuit includes a first inductor and a first capacitor, the first inductor is connected in series with the first capacitor.

13. The antenna assembly of claim 12, wherein, the resonance frequency of the second sub-resonance is greater than the resonance frequency of the first sub-resonance.

14. The antenna assembly of any of claims 10-13, wherein, the second resonance includes the third sub-resonance and the fourth sub-resonance, the matching circuit includes a second sub-matching circuit, the second sub-matching circuit includes a second inductor and a second capacitor, one end of the second inductor is coupled with the feed point, one end of the second capacitor is connected with one end of the second inductor, the other end of the second capacitor is grounded, the other end of the second inductor is configured to receive a radio frequency signal.

15. The antenna assembly of claim 14, wherein, the radiator includes a midpoint along its extending direction, the feed point and the grounding point are both located on the same side of the midpoint, and the grounding point is located between the feed point and the midpoint.

16. The antenna assembly of claim 15, wherein, a distance between the feed point and the grounding point is less than or equal to one eighth of the length of the radiator, and a distance between the grounding point and the midpoint is less than or equal to three eighths of the length of the radiator.

17. The antenna assembly of any of claims 14-16, wherein, the resonance frequency of the fourth sub-resonance is greater than the resonance frequency of the third sub-resonance.

18. The antenna assembly of any of claims 10-17, wherein, the radiator includes a first end and a second end, the feed point and the grounding point are located between the first end and the second end, and the feed point is located between the grounding point and the first end; a distance between the feed point and the first end is less than or equal to one third of the length of the radiator. so that a difference between the resonance frequency of the first sub-resonance and the resonance frequency of the second sub-resonance is less than or equal to 150 MHz; or, so that a difference between the resonance frequency of the third sub-resonance and the resonance frequency of the fourth sub-resonance is less than or equal to 500 MHz.

19. The antenna assembly of any of claims 10-18, wherein, the floor includes a first side edge and a second side edge adjacent to each other, the radiator includes a first branch opposite to the first side edge and a second branch opposite to the second side edge.

20. An electronic device, comprising: comprising: a radio frequency device coupled to the feed point; and the antenna assembly of any one of claims 1-19.

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