Antenna assembly and electronic device

Abstract

The application provides an antenna assembly and an electronic device. The antenna assembly comprises a first feed source and a first radiator. The first radiator comprises a body part and an extension part. The body part is long strip-shaped, comprising opposite first and second ends along a length direction, opposite third and fourth ends along a width direction, and a first feeding point. The first end is an open end, and the second end is grounded. The extension part is connected to at least part of the third end of the body part. The first feeding point is located between the first and second ends and is used to be connected to the first feed source. The first radiator generates a resonance current distribution supporting the transmission and reception of electromagnetic wave signals of at least a first frequency band under the excitation of the first feed source. The extension part is used to disperse the resonance current distribution on the body part, so as to reduce the SAR value on the side of the body part away from the extension part. The application can effectively avoid the SAR value exceeding the standard while ensuring the antenna radiation performance.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of communication, and in particular to an antenna assembly and an electronic device having the same. BACKGROUND

[0002] At present, with the popularization of 5G antennas, people's communication experience is getting better and better, but the number of antennas included in electronic devices is also increasing. Generally speaking, in addition to meeting the demand of communication performance, the radiation energy of the antenna also needs to meet the compliance of SAR (Specific Absorption Rate, Specific Absorption Rate), that is, meet the safety requirements. At present, when the radiation direction is towards the top, bottom and other directions of the electronic device, or is biased towards the screen side, the SAR standard of these radiation directions will be higher, so when the radiation direction of some antennas is towards the top, bottom or screen side of the electronic device, it is more likely to cause excessive radiation and not meet the safety requirements. Therefore, how to effectively ensure the radiation performance of the antenna and avoid the SAR value exceeding the standard has become a problem to be solved. SUMMARY

[0003] The present application provides an antenna assembly and an electronic device to solve the above problems.

[0004] In a first aspect, an antenna assembly is provided, which includes a first feed source and a first radiator. The first radiator includes a body portion and an extension portion. The body portion is in a long strip shape and includes opposite first and second ends in a length direction, opposite third and fourth ends in a width direction, and a first feed point. The first end is an open end, and the second end is grounded. The extension portion is connected to at least a part of the third end of the body portion. The first feed point is located between the first and second ends and is used to connect the first feed source. The first radiator generates a resonance current distribution supporting the transmission and reception of electromagnetic wave signals of at least a first frequency band under the excitation of the first feed source. The extension portion is used to disperse the resonance current distribution on the body portion to reduce the SAR value on the side of the body portion away from the extension portion.

[0005] In a second aspect, an electronic device is provided, which comprises an antenna assembly. The antenna assembly comprises a first feed source and a first radiator. The first radiator comprises a body portion and an extension portion. The body portion is long strip-shaped, comprising opposite first and second ends along a length direction, opposite third and fourth ends along a width direction, and a first feeding point. The first end is an open end, and the second end is grounded. The extension portion is connected to at least a part of the third end of the body portion. The first feeding point is located between the first and second ends, and is used to be connected to the first feed source. The first radiator generates a resonance current distribution under the excitation of the first feed source, which supports the transmission and reception of electromagnetic wave signals of at least a first frequency band. The extension portion is used to disperse the resonance current distribution on the body portion, so as to reduce the SAR value on the side of the body portion away from the extension portion.

[0006] The antenna assembly and the electronic device provided in the present application can make part of the current distribution on the extension portion, change the radiation direction of at least part of the electromagnetic wave signals to other desired directions, for example, to a direction with a lower SAR value standard, and effectively avoid the SAR value exceeding the standard. BRIEF DESCRIPTION OF DRAWINGS

[0007] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the background art, the drawings needed to be used in the embodiments of the present application or the background art will be described below.

[0008] Figure 1 FIG. 1 is a structural schematic diagram of an antenna assembly in an embodiment of the present application.

[0009] Figure 2 FIG. 2 is a side view of the antenna assembly in some embodiments of the present application, viewed from the first end side of the first radiator.

[0010] Figure 3 FIG. 3 is a current distribution schematic diagram of the first radiator of the antenna assembly in some embodiments of the present application.

[0011] Figure 4 FIG. 4 is another example diagram of the antenna assembly in some embodiments of the present application.

[0012] Figure 5 FIG. 5 is still another example diagram of the antenna assembly in some embodiments of the present application.

[0013] Figure 6 FIG. 6 is a schematic diagram of a reference antenna assembly.

[0014] Figure 7A plan view schematically illustrating a more specific structure of the antenna assembly in some embodiments of the present application.

[0015] Figure 8 A block diagram schematically illustrating a structure of the electronic device in some embodiments of the present application.

[0016] Figure 9 A plan view schematically illustrating the electronic device in some embodiments of the present application.

[0017] Figure 10 A partial view schematically illustrating a part of a structure of the electronic device in some embodiments of the present application, as viewed from the back.

[0018] Figure 11 A partial view schematically illustrating a part of a structure of the electronic device 100 in some embodiments of the present application, as viewed from the top 1D.

[0019] Figure 12 A comparative view schematically illustrating a radiation efficiency and a system total efficiency of the antenna assembly in some embodiments of the present application and a reference antenna assembly.

[0020] Figure 13 A comparative view schematically illustrating SAR values when the antenna assembly in some embodiments of the present application and a reference antenna assembly operate in a first frequency band.

[0021] Figure 14 A further block diagram schematically illustrating a structure of the electronic device in some embodiments of the present application. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present application will be clearly and completely 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, but not all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those of ordinary skill in the art without creative effort belong to the scope of the present application.

[0023] In the description of the embodiments of the present application, it should be understood that the terms "upper", "lower", "thickness", "length", "width" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not imply or indicate that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. The term "connection" in this application includes the meanings of physical structural connection, electrical connection, direct connection or indirect connection, and can be determined according to the required connection situation. In the description of the embodiments of the present application, the terms "first", "second", "third", "fourth" and the like are not specific, but are used to distinguish objects with the same name, and the terms "first", "second", "third", "fourth" and the like refer to the same name objects can be the same object under the description of the specification.

[0024] Please refer to Figure 1 , it is a structural schematic diagram of an antenna assembly 1 in an embodiment of the present application. As shown in Figure 1 , the antenna assembly 1 includes a first feed source 11 and a first radiator 12. The first radiator 12 includes a body part 121 and an extension part 122, the body part 121 is a long strip shape, including opposite first end D1 and second end D2 along the length direction, opposite third end D3 and fourth end D4 along the width direction, and first feed point F1, wherein the first end D1 is an open end, the second end D2 is grounded, the extension part 122 is connected with at least part of the third end D3 of the body part 121, the first feed point F1 is located between the first end D1 and the second end D2, and is used to be connected with the first feed source 11, the first radiator 12 generates a resonant current distribution supporting at least the first frequency band under the excitation of the first feed source 11; wherein the extension part 122 is used to disperse the resonant current distribution on the body part 121, so as to reduce the SAR value on the side of the body part 121 away from the extension part 122.

[0025] Wherein, when the first radiator 12 only includes the body part 121, the first radiator 12 generates a current distribution on the body part 121 under the excitation of the first feed source 11, and the radiation direction is a certain direction. The antenna assembly 1 in the present application can make part of the current, i.e. part of the resonant current distribution on the extension part 122, and can change the radiation direction of at least part of the electromagnetic wave signal to the desired other direction, for example, to the direction with lower SAR value standard, so as to effectively avoid the SAR value exceeding the standard.

[0026] Wherein, since the body part 121 is long strip-shaped, the length direction is the extending direction of the longest side of the body part 121, and the width direction is the direction approximately perpendicular to the length direction.

[0027] In some embodiments, the first radiator 2 can be long straight strip-shaped, or long curved strip-shaped. Figure 1 In some embodiments, the first radiator 2 can be long straight strip-shaped, or long curved strip-shaped.

[0028] Wherein, the first feeding point F1 is located between the first end D1 and the second end D2, and also at any position between the third end D3 and the fourth end D4.

[0029] Please refer to Figure 2 , it is a side view of the antenna assembly 1 in some embodiments of the present application, viewed from the first end D1 side of the first radiator 12. Wherein, the first feeding point F1 is located between the first end D1 and the second end D2 of the body part 121, and is located on the first surface S1 of the body part 121, the extension part 122 is strip-shaped, one end of the extension part 122 is connected with at least part of the third end D3 of the body part 121, and the extension part 122 is inclined towards the first surface S1 of the body part 121 and has a preset included angle with the body part 122, the preset included angle is greater than 0° and less than 180°.

[0030] That is, in some embodiments, as shown in Figure 2 , the extension part 122 is inclined towards the first surface S1 of the body part 121, that is, inclined towards the side where the first feeding point F1 is located and has a preset included angle with the body part 122.

[0031] Further, the extension part 122 can include opposite third surface S3 and fourth surface S4, wherein the third surface S3 is inclined towards the same side as the first surface S1 of the body part 122, and the fourth surface S4 is inclined towards the same side as the second surface S2 of the body part 122, the extension part 122 is inclined towards the first surface S1 of the body part 121 and has a preset included angle with the body part 122, which can also be referred to as the third surface S3 of the extension part 122 and the first surface S1 of the body part 122 having the included angle less than 180°.

[0032] Wherein, the side of the aforementioned body part 121 away from the extension part 122 can refer to the side towards which the second surface S2 of the body part 122 is inclined.

[0033] Please refer to Figure 3 , it is a current distribution diagram of the first radiator 12 of the antenna assembly 1 in some embodiments of the present application. Wherein, asFigure 2 As shown, the body part 121 further comprises a second surface S2 opposite to the first surface S1. Where the first radiator 12 does not comprise the extension part 122, when the first feed source 11 excites the body part 12 through the first feeding point F1 located on the first surface S2 to perform the transceiving of electromagnetic wave signals, the radiation direction of electromagnetic wave signals is mainly in the direction R1 from the first surface S1 to the second surface S2, i.e., approximately in the direction R1 perpendicular to the second surface S2 and away from the first surface S1.

[0034] As shown, when the first radiator 12 comprises the extension part 122, part of the current is distributed on the extension part 122, so that the radiation direction of at least part of the electromagnetic wave signals is in the direction R2 from the third surface S3 to the fourth surface S4 of the extension part 122, thereby effectively reducing the radiation intensity of electromagnetic wave signals in the direction from the first surface S1 to the second surface S2, and effectively avoiding the SAR value in this radiation direction exceeding the standard. The current in the present application can refer to the aforementioned resonant current. Figure 3 As shown, when the first radiator 12 comprises the extension part 122, part of the current is distributed on the extension part 122, so that the radiation direction of at least part of the electromagnetic wave signals is in the direction R2 from the third surface S3 to the fourth surface S4 of the extension part 122, thereby effectively reducing the radiation intensity of electromagnetic wave signals in the direction from the first surface S1 to the second surface S2, and effectively avoiding the SAR value in this radiation direction exceeding the standard. The current in the present application can refer to the aforementioned resonant current.

[0035] In some embodiments, as shown in Figure 2 As shown, the extension part 122 is inclined towards the first surface S1 of the body part 121 and has a preset included angle with the body part 122, which can be 90°, i.e., the extension part 122 can be connected perpendicularly to the body part 121, and the extension part 122 is approximately located on one side of the first surface S1 of the body part 121. Therefore, the radiation direction of at least part of the electromagnetic wave signals is in the direction R2 from the third surface S3 to the fourth surface S4 of the extension part 122, which can be significantly deviated from the direction R1 from the first surface S1 to the second surface S2, and can be directed to a direction with lower SAR requirement, thereby effectively reducing the risk of SAR value exceeding the standard.

[0036] For example, in some embodiments, the antenna assembly 1 can be applied in an electronic device, and the first radiator 12 can be disposed on the top of the electronic device, the first surface S1 and the second surface S2 of the body part 121 can be parallel to the end surface of the top of the electronic device, and the second surface S2 can be the direction facing the top of the electronic device. The third end D3 is the end of the body part 121 close to the back of the electronic device, the extension part 122 is substantially perpendicular to the body part 121 and substantially parallel to the back of the electronic device, and the fourth surface S4 of the extension part 122 can face the direction facing the back of the electronic device. Therefore, when the first feed source 11 excites the first radiator 12 to receive and transmit electromagnetic wave signals through the first feed point F1 located on the first surface S2, the radiation direction of the electromagnetic wave signals includes the direction R1 from the first surface S1 to the second surface S2, that is, the direction facing the top of the electronic device, and also includes the direction R2 from the third surface S3 to the fourth surface S4 of the extension part 122, that is, the direction facing the back of the electronic device. Therefore, the radiation energy in the direction facing the top of the electronic device can be effectively reduced, and the direction facing the back of the electronic device is usually far away from the user, so there is usually no problem of exceeding the SAR value, or the SAR standard is relatively low, and the requirement corresponding to the relatively low SAR standard is usually not exceeded. Therefore, the problem of exceeding the SAR value can be effectively avoided. More specific content will be introduced later.

[0037] Wherein, the direction from the first surface S1 to the second surface S2 of the body part 121 is the thickness direction of the body part 121, and the thickness direction is perpendicular to the length direction and the width direction. In some embodiments, when the body part 121 is a long straight strip shape, the first surface S1 and the second surface S2 are both planes, and when the body part 121 is a curved straight strip shape, the first surface S1 and the second surface S2 are curved surfaces. That is, the body part 121 is a curved straight strip shape, specifically curved in the direction from the first surface S1 to the second surface S2, or curved in the direction from the second surface S2 to the first surface S1.

[0038] Wherein, in some embodiments, as shown in Figure 1 The extension part 122 is connected to the area of the third end D3 of the body part 121 close to the first end D1, and the extension part 122 is spaced apart from the second end D2, that is, there is a gap between the extension part 122 and the second end D2.

[0039] That is, in some embodiments, the extension 122 can be arranged close to the first end D1 of the body portion 121, and can be spaced apart from the second end D2 without being grounded.

[0040] As shown in FIG. 1, in some embodiments, the extension 122 can be arranged close to the first end D1 of the body portion 121, and can be spaced apart from the second end D2 without being grounded. Figure 1 As shown in FIG. 1, in some embodiments, the end of the extension 122 close to the first end D1 can be flush with the first end D1. Apparently, in some embodiments, the end of the extension 122 close to the first end D1 can also be spaced apart from the first end D1, but the spacing between the end of the extension 122 close to the first end D1 and the first end D1 is smaller than the spacing between the end of the extension 122 close to the second end D2 and the second end D2, so that the extension 122 is still arranged relatively close to the first end D1.

[0041] Apparently, in other embodiments, the extension 122 can also be connected to the region of the third end D3 of the body portion 121 close to the second end D2, that is, in other embodiments, the extension 122 can be arranged close to the second end D2 of the body portion 121.

[0042] As shown in FIG. 1, in some embodiments, the extension 122 can be arranged close to the first end D1 of the body portion 121, and can be spaced apart from the second end D2 without being grounded. Figure 1 As shown in FIG. 1, in some embodiments, the extension 122 can be arranged close to the first end D1 of the body portion 121, and can be spaced apart from the second end D2 without being grounded. As shown in FIG. 1, the body portion 121 and the extension 122 can both be long straight strips, and the projections of the body portion 121 and the extension 122 in the thickness direction are both rectangles. The edges along the width direction where the first end D1 and the second end D2 of the body portion 121 are located are the short edges of the body portion 121, and the edges along the length direction where the first end D1 and the second end D2 of the body portion 121 are located are the long edges of the body portion 121. The extension 122 is specifically connected to the third end D2 through the long edge side. In some embodiments, the size of the extension 122 in the length direction is smaller than the size of the body portion 121 in the length direction, so that the extension 122 is only connected to part of the region of the third end D3 of the body portion 121. Apparently, in some embodiments, the size of the extension 122 in the length direction can be equal to the size of the body portion 121 in the length direction, so that the extension 122 can be connected to all regions of the third end D3 of the body portion 121.

[0043] As shown in FIG. 1, in some embodiments, the extension 122 can be arranged close to the first end D1 of the body portion 121, and can be spaced apart from the second end D2 without being grounded. Figure 4 As shown in FIG. 1, in some embodiments, the extension 122 can be arranged close to the first end D1 of the body portion 121, and can be spaced apart from the second end D2 without being grounded. Figure 4 As shown in FIG. 1, in some embodiments, the extension 122 can be arranged close to the first end D1 of the body portion 121, and can be spaced apart from the second end D2 without being grounded.

[0044] Obviously, the extension 122 can also include three equal numbers. That is, in some embodiments, the extension 122 can include at least two. Thus, the extension 122 can also include at least two, and the at least two extensions 122 are spaced apart, so that the extension 122 can be avoided at the position where isolation is required as needed, so that the extension 122 is more flexible, and can more effectively ensure the radiation performance under the premise of avoiding the SAR value from exceeding the standard.

[0045] In some embodiments, when the extension 122 includes at least two, each extension 122 is inclined toward the first surface S1 of the body portion 121 and has an included angle with the body portion 122, and the included angles between different extensions 122 and the body portion 122 can be the same or different. For example, in some embodiments, the included angles between different extensions 122 and the body portion 122 can be the same, all being 90°. For another example, the included angles between different extensions 122 and the body portion 122 can be different, for example, the included angle between one of the extensions 122 and the body portion 122 can be 70°, the included angle between another of the extensions 122 and the body portion 122 can be 90°, the included angle between another of the extensions 122 and the body portion 122 can be 110°, and so on, so that the radiation direction can be more dispersed, and it is more beneficial to avoid the SAR value from exceeding the standard.

[0046] Please refer to Figure 5 for another example diagram of the antenna assembly 1 in some embodiments of the present application. As shown in Figure 5 , in some embodiments, the fourth end D4 of the body portion 121 is provided with a notch K1. That is, in some embodiments, the fourth end D4 of the body portion 121 opposite to the third end D3 connected with the extension 122 is also provided with a notch K1. Among them, Figure 5 may be a top view schematic diagram viewed from the second surface S2 side of the body portion 121.

[0047] Thus, by providing the notch K1 at the fourth end D4, more current can flow to the extension 122, so that more current is distributed on the extension 122, and less current is distributed on the body portion 121. Thus, the radiation direction of more electromagnetic wave signals will be the direction R2 from the third surface S3 to the fourth surface S4 of the extension 122, so that more energy of the electromagnetic wave signals will be concentrated in the corresponding radiation direction when the extension 122 is excited, and only less energy will be concentrated in the corresponding radiation direction when the body portion 121 is excited, that is, the direction R2 from the first surface S1 to the second surface S2 of the body portion 121. Thus, the radiation performance can be ensured, and the SAR value can be more effectively avoided from exceeding the standard.

[0048] In some embodiments, the projection of the notch K1 on the third end D3 of the body portion 121 at least partially overlaps with the region where the extension portion 122 is connected. Here, the region where the extension portion 122 is connected is the region of the third end D3 where the extension portion 122 is connected.

[0049] In some embodiments, the notch K1 can also extend completely between the first end D1 and the second end D2, i.e., the notch K1 can be a notch that removes a certain length of all regions of the fourth end D4.

[0050] In some embodiments, the proportion of the dimension of the notch K1 along the width direction of the body portion 121 to the width of the body portion 121 is less than 1 / 2. That is, in some embodiments, the notch K1 can be a notch that removes a preset portion of the body portion 121 from the fourth end D4 of the body portion 121 towards the third end D3, and the proportion of the dimension of the preset portion along the width direction of the body portion 121 to the width of the body portion 121 is less than 1 / 2.

[0051] Therefore, the proportion of the dimension of the notch K1 along the width direction of the body portion 121 to the width of the body portion 121 is less than 1 / 2, which avoids the size of the body portion 121 being too small, and can ensure the antenna radiation performance and can also make the current more distributed to the extension portion 122.

[0052] In some embodiments, the proportion of the dimension of the notch K1 along the width direction of the body portion 121 to the width of the body portion 121 is 1 / 4-1 / 2. Therefore, the notch K1 can not be too large or too small, and the antenna radiation performance can be ensured and the current can be more distributed to the extension portion 122.

[0053] In some embodiments, the proportion of the dimension of the notch K1 along the width direction of the body portion 121 to the width of the body portion 121 is 1 / 3. Obviously, in some embodiments, the proportion of the dimension of the notch K1 along the width direction of the body portion 121 to the width of the body portion 121 can also be 2 / 5, etc.

[0054] Here, when the fourth end D4 of the body portion 121 is provided with the notch K1, the extension portion 122 can be one as shown in Figure 1 or multiple as shown in Figure 4 .

[0055] Here, the width of the body portion 121 is the dimension along the width direction of the body portion 121.

[0056] In some embodiments, the length of the body part 121 is greater than the length of a reference radiator in a reference antenna assembly, which also supports at least electromagnetic wave signals of the first frequency band.

[0057] Referring to Figure 6 is a schematic view of a reference antenna assembly 1'. The reference antenna assembly 1' can include a first feed source 11 and a reference radiator 12', wherein the reference radiator 12' only includes a body part 121, which is a long strip shape, includes opposite first and second ends D1 and D2 along the length direction, and a first feed point F1, wherein the first end D1 is an open end, the second end D2 is grounded, and the first feed point F1 is located between the first and second ends D1 and D2 for connecting with the first feed source 11, and the reference radiator 12' supports at least the transmission and reception of electromagnetic wave signals of the first frequency band under the excitation of the first feed source 11. Wherein, Figure 6 is a schematic view of the side of the reference antenna assembly 1'.

[0058] That is, the reference radiator 12' in a reference antenna assembly 1' can only include the body part 121, without the extension part 122 described above. Wherein, as shown in Figure 5 the reference antenna assembly 1' also does not have the notch K1 of the present application. That is, the reference radiator 12' of the reference antenna assembly 1' can be a conventional radiator structure for supporting the transmission and reception of electromagnetic wave signals of the first frequency band.

[0059] Therefore, in the present application, the length of the body part 121 is greater than the length of the reference radiator 12' in the reference antenna assembly 1', which allows the current to be more dispersed on the body part 121, and avoids excessive concentration of energy, thereby facilitating the reduction of antenna radiation energy and further avoiding excessive SAR value.

[0060] Wherein, the length of the body part 121 is the size of the body part 121 along the length direction, and the length of the reference radiator 12' is the size of the reference radiator 12' along the length direction.

[0061] In some embodiments, when the length of the body part 121 of the antenna assembly 1 is greater than the length of the reference radiator 12' in the reference antenna assembly 1', the antenna assembly 1 can only include the extension part 122 without the notch K1, or can include both the extension part 122 and the notch K1. In some embodiments, when the length of the body part 121 of the antenna assembly 1 is greater than the length of the reference radiator 12' in the reference antenna assembly 1', the antenna assembly 1 can not include both the extension part 122 and the notch K1, i.e. the length of the first radiator 12 is the same as the length of the reference radiator 12', and only the length is greater than the length of the reference radiator 12'.

[0062] In some embodiments, the length of the body part 121 of the antenna assembly 1 can be 2 mm greater than the length of the reference radiator 12' in the reference antenna assembly 1'.

[0063] Please refer to Figure 1 , Figure 2 Figures, wherein the antenna assembly 1 further includes a matching unit 13 connected between the first feed source 11 and the first feed point F1, and the matching unit 13 is used for matching adjustment of the first radiator 12, so that the first radiator 12 supports at least the first frequency band of electromagnetic wave signals under the excitation of the first feed source 11.

[0064] When the first radiator 12 increases the extension part 122, or further increases the notch K1, and / or further increases the length compared with the reference radiator 12', the equivalent electrical length of the first radiator 12 will change, and the matching unit 13 is used for matching adjustment, so that the first radiator 12 still meets the resonance requirement.

[0065] The matching unit 13 includes inductance and / or capacitance, or includes a series or parallel structure composed of multiple inductances and / or multiple capacitances.

[0066] In some embodiments, the part between the first end D1 of the body part 121 of the first radiator 12 and the first feed point F1 is used for realizing the radiation of the first frequency band of electromagnetic wave signals. The matching unit 13 is used for matching adjustment of the first radiator 12 and can equivalent to the corresponding electrical length. Assuming that the equivalent electrical length of the matching unit 13 is L1, and the equivalent electrical length of the part between the first end D1 of the body part 121 of the first radiator 12 and the first feed point F1 is L2, then L1+L2=λ1 / 4, wherein λ1 is the wavelength corresponding to the first frequency band, i.e. the wavelength corresponding to the center frequency of the first frequency band.

[0067] Therefore, even if the first radiator 12 increases the extension 122, or further increases the notch K1, and / or further increases the length compared with the reference radiator 12', so that the equivalent electrical length of the portion between the first end D1 of the body part 121 of the first radiator 12 and the first feeding point F1 changes, the matching unit 13 can still make the first radiator 12 resonate in the first frequency band and support the transmission and reception of electromagnetic wave signals in the first frequency band, as long as the sum of the equivalent electrical length of the matching unit 13 and the equivalent electrical length of the portion between the first end D1 of the body part 121 of the first radiator 12 and the first feeding point F1 is λ1 / 4.

[0068] Please refer to Figure 7 , which is a plan view showing a more specific structure of the antenna assembly 1 in some embodiments of the present application. As shown in Figure 7 , the antenna assembly 1 further includes a second radiator 14, a second feeding source 15, and a grounding metal piece 16. The second radiator 14 includes a second feeding point F2, which is connected to the second feeding source 15. The second radiator 14 supports the transmission and reception of electromagnetic wave signals in at least a second frequency band under the excitation of the second feeding source F2. The grounding metal piece 16 is located between the first radiator 12 and the second radiator 14, and is used to at least realize the isolation between the first radiator 12 and the second radiator 14.

[0069] That is, in some embodiments, the antenna assembly 1 can further include a second radiator 14 for supporting electromagnetic wave signals in a second frequency band. The second radiator 14 and the first radiator 12 are provided with a grounding metal piece 16 therebetween to realize the isolation between the second radiator 14 and the first radiator 12 and avoid interference.

[0070] Among them, as shown in Figure 7 , the second radiator 14 includes a fifth end D5 and a sixth end D6 opposite in the length direction. The fifth end D5 is an open end, and the sixth end D6 is grounded. The fifth end D5 is close to the grounding metal piece 16 and is spaced apart from the grounding metal piece 16. The first end D1 of the body part 121 of the first radiator 12 is close to the grounding metal piece 16 and is spaced apart from the grounding metal piece 16.

[0071] That is, in some embodiments, the grounding metal piece 16 is specifically arranged between the first end D1 of the body part 121 of the first radiator 12, which is an open end, and the fifth end D5 of the second radiator 14, which is an open end.

[0072] Among them, as shown in Figure 7As shown, the ground metal piece 16 is also strip-shaped, comprising opposite seventh end D7 and eighth end D8, and grounding point G1 for grounding, which is located between the seventh end D7 and the eighth end D8. The seventh end D7 of the ground metal piece 16 is opposite and spaced apart from the first end D1 of the body part 121 of the first radiator 12, and the eighth end D8 of the ground metal piece 16 is opposite and spaced apart from the fifth end D5 of the second radiator 12.

[0073] The part between the second feed point F2 of the second radiator 14 and the fifth end D5 is used to radiate electromagnetic wave signals of the second frequency band. In some embodiments, the length of the part between the second feed point F2 of the second radiator 14 and the fifth end D5 is substantially equal to the electrical length, and can be equal to λ2 / 4, where λ2 is the wavelength corresponding to the second frequency band, i.e. the wavelength corresponding to the center frequency of the second frequency band.

[0074] In some embodiments, another matching unit can also be connected between the second feed point F2 of the second radiator 14 and the second feed source, for matching adjustment. At this time, the other matching unit can also be equivalent to a part of the electrical length, and the electrical length of the part between the second feed point F2 of the second radiator 14 and the fifth end D5 can be less than λ2 / 4, and the sum of the electrical length equivalent to the other matching unit is λ2 / 4.

[0075] In some embodiments, the part between the first end D1 which is an open end of the body part 121 of the first radiator 12 and the second end D2 of the ground is used to radiate electromagnetic wave signals of the third frequency band. Similarly, the matching unit 13 performs matching adjustment on the first radiator 12 and can be equivalent to a corresponding electrical length. Assuming that the electrical length equivalent to the matching unit 13 is L1, and the electrical length equivalent to the part between the first end D1 of the body part 121 of the first radiator 12 and the second end D2 is L3, then L1+L3=λ3 / 4, where λ3 is the wavelength corresponding to the third frequency band, i.e. the wavelength corresponding to the center frequency of the third frequency band.

[0076] In some embodiments, the portion between the fifth end D5 and the sixth end D6 of the second radiator 14 is also used to realize radiation of electromagnetic wave signals of a fourth frequency band. The length of the portion between the fifth end D5 and the sixth end D6 of the second radiator 14 is substantially equal to an electrical length, and can be equal to λ4 / 4, where λ4 is a wavelength corresponding to the second frequency band, i.e., a wavelength corresponding to a center frequency of the fourth frequency band. Obviously, when another matching unit is connected between the second feed point F2 of the second radiator 14 and the second feed source. Since the matching unit can also be equivalent to a partial electrical length, the electrical length of the portion between the fifth end D5 and the sixth end D6 can also be less than λ4 / 4, and the sum of the electrical length equivalent to the other matching unit is λ4 / 4.

[0077] Therefore, through the above structure, each radiator can realize at least two working frequency bands, and multiple frequency bands can be supported by a smaller antenna size, greatly meeting the current communication requirements.

[0078] In some embodiments, the first frequency band supported by the first radiator 12 can be an N78 frequency band, the second frequency band supported by the second radiator 14 can be a WIFI 5G frequency band, the third frequency band supported by the first radiator 12 can be a GPS L1 frequency band, and the fourth frequency band supported by the second radiator 14 can be a WIFI 2.4G frequency band.

[0079] Since the energy of the N78 frequency band is relatively concentrated, the SAR value is high, and the SAR value is often prone to exceed the standard, in the present application, through the above structure, the SAR value of the N78 frequency band can be effectively avoided. Obviously, through the above improvement, the SAR value of other frequency bands supported by the first radiator 12, such as the third frequency band, can also be effectively reduced.

[0080] In some embodiments, when the second radiator 14 supports the WIFI 5G frequency band, the grounding metal piece 16 can also act as a parasitic direct of the WIFI 5G frequency band, further widening the bandwidth of the WIFI 5G frequency band.

[0081] In some embodiments, the first feed source 11 is configured to output a first feed signal and a second feed signal, the first feed signal being a feed signal corresponding to the first frequency band, and the second feed signal being a feed signal corresponding to the third frequency band. The first feed signal and the second feed signal output by the first feed source 11 are fed into the body part 121 through the first feed point F1, and the portion between the first end D1 of the body part 121 of the first radiator 12 and the first feed point F1 resonates at the first frequency band under the excitation of the first feed signal, and supports the transmission and reception of electromagnetic wave signals of the first frequency band; the portion between the first end D1 and the second end D2 of the body part 121 of the first radiator 12 resonates at the third frequency band under the excitation of the second feed signal, and supports the transmission and reception of electromagnetic wave signals of the third frequency band.

[0082] The second feed source 15 is configured to output a third feed signal and a fourth feed signal, the third feed signal being a feed signal corresponding to the second frequency band, and the fourth feed signal being a feed signal corresponding to the fourth frequency band. The third feed signal and the fourth feed signal output by the second feed source 15 are fed into the second radiator through the second feed point F2. The portion between the second feed point F2 and the fifth end D5 of the second radiator 14 resonates at the second frequency band under the excitation of the third feed signal, and supports the transmission and reception of electromagnetic wave signals of the second frequency band; the portion between the fifth end D5 and the sixth end D6 of the second radiator 14 resonates at the fourth frequency band under the excitation of the fourth feed signal, and supports the transmission and reception of electromagnetic wave signals of the fourth frequency band.

[0083] The first feed source 11 can be a radio frequency front-end circuit (not shown in the figure) that mixes the first feed signal and the second feed signal through a combiner (not shown in the figure) to obtain a feed signal source. The second feed source 15 can also be a radio frequency front-end circuit that mixes the third feed signal and the fourth feed signal through a combiner to obtain a feed signal source.

[0084] Obviously, in other embodiments, the first radiator 12 and the second radiator 14 can support other frequency bands as needed, or can additionally support other frequency bands. For example, in addition to supporting the N78 frequency band and the GPS L1 frequency band, the first radiator 12 can also support the WIFI 5G frequency band. The WIFI 5G can also be implemented through the portion between the first end D1 of the body portion 121 of the first radiator 12 and the first feed point F1. The matching unit 13 can be an adjustable matching unit, and the equivalent electrical length is adjusted as needed so that the sum of the electrical length of the portion between the first end D1 of the body portion 121 of the first radiator 12 and the first feed point F1 and the equivalent electrical length of the matching unit 13 is 1 / 4 of the wavelength corresponding to the N78 frequency band, thereby resonating in the N78 frequency band, or is 1 / 4 of the wavelength corresponding to the WIFI 5G frequency band, thereby resonating in the WIFI 5G frequency band. In addition, in other embodiments, the second radiator 14 can support the WIFI 2.4G frequency band and the MB (medium frequency band), and specifically, the electrical length of the portion between the second feed point F2 and the fifth end D5 of the second radiator 14 can be approximately equal to 1 / 4 of the wavelength of the WIFI 2.4G frequency band, thereby resonating in the WIFI 5G frequency band, and the electrical length of the portion between the fifth end D5 and the sixth end D6 of the second radiator 14 can be approximately equal to 1 / 4 of the wavelength of the MB frequency band, thereby resonating in the MB frequency band.

[0085] The first feed source 11 and the second feed source 15 can correspondingly be feed sources outputting corresponding feed signals.

[0086] Therefore, the sizes of the first radiator 12 and the second radiator 14 can be designed as needed, and the matching parameters of the matching circuit, such as the capacitance and / or inductance values, can be further designed, so that the first radiator 12 and the second radiator 14 can support corresponding frequency bands.

[0087] That is, the structure of the first radiator 12 of the antenna assembly 1 in any of the above embodiments in the present application can be applied to support the transmission and reception of electromagnetic wave signals of any frequency band, and can avoid the SAR value of the electromagnetic wave signals of any frequency band exceeding the standard.

[0088] In some embodiments, the structure of the second radiator 14 can also be the same as the structure of the first radiator 12 described above, i.e., the structure of the first radiator 12 in any of the above embodiments, so that the SAR value of the electromagnetic wave signals supported by the second radiator 14 can also be effectively prevented from exceeding the standard. When the structure of the second radiator 14 is the same as the structure of the first radiator 12 described above, the structure of the second radiator 14 can refer to the structure of the first radiator 12 in any of the above embodiments, which will not be repeated here.

[0089] Therefore, by the antenna assembly 1 of the present application, by connecting the extension 122 at the third end D3 of the body part 121 of the first radiator 12, at least part of the current can be distributed on the extension 122, and the radiation direction of at least part of the electromagnetic wave signals can be changed to other desired directions, such as the direction with a lower SAR value standard, so that the SAR value can be effectively prevented from exceeding the standard. In addition, each of the first radiator 12 and the second radiator 14 included in the antenna assembly 1 of the present application can also support the transmission and reception of electromagnetic wave signals of at least two frequency bands, and a plurality of frequency bands can be greatly realized by a smaller antenna size to meet the communication requirements.

[0090] Please refer to Figure 8 , which is a structural block diagram of an electronic device 100 in some embodiments of the present application. The electronic device 100 can include the antenna assembly 1 in any of the above embodiments. The electronic device 100 can be any electronic device with an antenna, such as a mobile phone, a tablet computer, etc.

[0091] By configuring the antenna assembly 1 described above, the electronic device 100 can effectively prevent the SAR value from exceeding the standard, and a plurality of frequency bands can be greatly realized by a smaller antenna size to meet the communication requirements.

[0092] Please refer to Figure 9 , which is a plan view of an electronic device 100 in some embodiments of the present application. As shown in Figure 9 , the electronic device 100 includes the antenna assembly 1. In some embodiments, the electronic device 100 can include the antenna assembly 1 in any of the above embodiments. Figure 9 , which is a top view schematically showing the structure of the antenna assembly 1 from the back side of the electronic device 100. In some embodiments, the top view schematically showing the structure of the antenna assembly 1 from the back side of the electronic device 100 can be the top view schematically showing the structure of the antenna assembly 1 from the back side of the electronic device 100 in any of the above embodiments. Figures 1-4 , and Figure 7 , etc. The antenna assembly 1 shown in the above embodiments is actually the antenna assembly 1 from the perspective of the back side of the electronic device 100.

[0093] In some embodiments, the antenna assembly 1 schematically shown in Figure 9 is the antenna assembly 1 from the perspective of the back side of the electronic device 100. Figure 7 The antenna assembly 1 schematically shown in Figure 9The antenna assembly 1 shown in the figure simultaneously includes a first radiator 12, a second radiator 13, and a ground metal piece 16.

[0094] As shown in the figure, Figure 9 The first radiator 12 and the second radiator 13 are arranged in the frame B1 of the electronic device 100 and are arranged at intervals through the gap X1. That is, the radiators including the first radiator 12 of the antenna assembly 1 are arranged in the frame B1. When the ground metal piece 16 is included, the ground metal piece 16 is also arranged in the frame B1.

[0095] In some embodiments, the frame B1 of the electronic device 100 is a metal frame, and the first radiator 12 and the second radiator 13 are metal frame segments of the metal frame of the electronic device 100 formed by opening the gap X1. That is, in some embodiments, the radiators including the first radiator 12 of the antenna assembly 1 are metal frame segments of the metal frame of the electronic device 100 formed by opening the gap X1. When the ground metal piece 16 is included, the ground metal piece 16 is also a metal frame segment of the metal frame formed by opening the gap X1.

[0096] In other embodiments, the frame B1 of the electronic device 100 is a non-metal frame, and the first radiator 12 and the second radiator 13 are metal segments arranged in the frame of the electronic device 100. That is, in some embodiments, the radiators including the first radiator 12 of the antenna assembly 1 are metal segments arranged in the frame of the electronic device 100. When the ground metal piece 16 is included, the ground metal piece 16 is also a metal segment arranged in the frame of the electronic device 100.

[0097] That is, in other embodiments, the frame B1 of the electronic device 100 can also be a non-metal frame with low conductivity, such as a plastic, a plastic, a ceramic, etc. The first radiation branch 11, the parasitic branch 12, and the second radiation branch 21 are metal segments arranged in the frame B1 of the electronic device 100.

[0098] The first radiator 12 and the second radiator 13 can be embedded in the frame of the electronic device 100 or arranged on the inner side surface of the frame of the electronic device 100.

[0099] As shown in the figure, Figure 9 The electronic device 100 includes a top 1D, a bottom 2D, and two side edges 3D and 4D. As shown in the figure, Figure 9As shown, the antenna assembly 1 can be positioned approximately at the top 1D of the electronic device 100. For example, as Figure 9 As shown, the first antenna radiator 12 and the grounding metal component 16 can be disposed at the position of the frame B1 located at the top 1D. For example, as mentioned above, when the frame B1 is a metal frame, it can be a metal frame segment formed by opening a gap in the frame B1 located at the top 1D. The second radiator 14 can be disposed at the connection position of the top 1D and one of the sides of the electronic device 100, that is, disposed at a top corner of the electronic device 100.

[0100] Obviously, in some embodiments, the antenna assembly 1 may also be disposed approximately at the bottom 1D of the electronic device 100, or approximately at the side 3D or 4D of the electronic device 100.

[0101] Among them, such as Figure 9 As shown, the body portion 121 of the first radiator 12 and the grounding metal part 16 can be long straight strips, and the second radiator 14 can be a curved long strip.

[0102] Please refer to the following: Figure 10 and Figure 11 , Figure 10 This is a partial schematic diagram showing a portion of the structure of an electronic device 100 as viewed from the rear in some embodiments of this application. Figure 11 This is a partial schematic diagram showing a portion of the structure of an electronic device 100 in some embodiments of this application, viewed from top 1D.

[0103] In some embodiments, such as Figure 10 as well as Figure 11 As shown, the electronic device 100 includes a back cover 3 and a display screen 4. When the electronic device 100 includes the aforementioned antenna assembly 1, that is, when the aforementioned antenna assembly 1 is disposed in the electronic device 100, the third end D3 of the body portion 121 of the first radiator 12 is the end closer to the back cover 3, and the fourth end D4 of the body portion 121 of the first radiator 12 is the end closer to the display screen 4.

[0104] Therefore, as described above, when the first radiator 12 is arranged at the top 1D of the electronic device, the first surface S1 and the second surface S2 of the body part 121 can be parallel to the end surface of the top 1D of the electronic device 100, and the second surface S2 can be the direction facing the top 1D of the electronic device 100. The third end D3 is the end of the body part 121 close to the back of the electronic device 100, that is, close to the back cover 3 of the electronic device 100, when the extension part 122 extends substantially perpendicular to the body part 121 and from the top 1D to the bottom 2D of the electronic device 100. Therefore, when the first feed source 11 excites the first radiator 12 to transmit and receive electromagnetic wave signals through the first feeding point F1, the radiation direction of the electromagnetic wave signals includes the direction R1 from the first surface S1 to the second surface S2 of the body part 121 of the first radiator 12, that is, the direction facing the top 1D of the electronic device 100, and also includes the direction R2 from the third surface S3 to the fourth surface S4 of the extension part 122, that is, the direction facing the back of the electronic device 100, that is, the back cover 3. Therefore, the radiation energy in the direction facing the top 1D of the electronic device 100 can be effectively reduced, and the direction facing the back of the electronic device 100, that is, the back cover 3, is usually far away from the user, so there is usually no problem of exceeding the SAR value, or the SAR standard is relatively low, and the requirement corresponding to the relatively low SAR standard is usually not exceeded. Therefore, the problem of exceeding the SAR value can be effectively avoided.

[0105] The length direction of the body part 121 of the first radiator 12 is the extension direction of the bezel B1 on the top 1D, that is, the length direction of the bezel B1. The width direction of the body part 121 of the first radiator 12 can be the thickness direction of the electronic device 100, that is, the direction from the display screen 4 to the back cover 3 of the electronic device. The length direction of the second radiator 14 can also be the extension direction of the bezel B1 of the corresponding part.

[0106] In the description of the electronic device 100 in the embodiments of the present application, the orientation words such as "top" and "bottom" are mainly described based on the orientation of the electronic device 100 when the user holds it, and the position facing the top side of the electronic device 100 is "top", and the position facing the bottom side of the electronic device 100 is "bottom", which does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the orientation of the electronic device 100 in the actual application scenario. In some embodiments, the bottom end of the electronic device 100 is the end provided with the earphone hole and the USB hole, and the top of the electronic device 100 is the other end opposite to the end provided with the earphone hole and the USB hole, which can also refer to the end provided with the camera, the microphone, etc.

[0107] Please refer back to Figure 9 As shown in Figure 9 , the electronic device 100 further comprises a mainboard 201, wherein the first feed source 11, the second feed source 15, etc. can be arranged on the mainboard 201. The aforementioned "ground" can be the ground on the mainboard 201.

[0108] As shown in Figure 9 , the electronic device 100 further comprises a front shell 202, which is used to support the display screen 4 and other structures, and serves as the ground of the whole machine. The ground on the mainboard 201 is connected with the front shell 202 to provide a ground potential.

[0109] Among them, the ground connection points G1 of the first radiator 12, the second radiator 14 and the grounding metal piece 16 can be grounded by electrically connecting the ground connection points G1 with the ground on the mainboard 201 or the front shell 202 through conductive wires, FPCs, metal springs, soldering tin, etc.

[0110] Among them, the first feed point F1 and the second feed point F2 can also be connected with the corresponding feed source through feed connection pieces such as conductive wires, FPCs, metal springs, soldering tin, etc. Please refer back to Figure 1 , for example, the first feed point F1 can be electrically connected with the first feed source 11 through the feed connection piece J1. Please refer back to Figure 7 , for example, the second feed point F2 can also be electrically connected with the second feed source 15 through the feed connection piece J2.

[0111] Among them, please refer back to Figure 10 , wherein the extension part 122 of the first radiator 12 extends away from the body part 121 to a position with a predetermined interval from the front shell 202, so as to avoid the influence of the front shell 202 on the antenna radiation performance. In addition, the two opposite ends of the extension part 122 of the first radiator 12 in the length direction of the body part 121 are both away from the functional devices such as the camera of the electronic device 100 by a distance greater than a predetermined distance, so as to avoid mutual interference.

[0112] That is, in some embodiments, the size of the extension part 122 of the first radiator 12 can depend on the size of the clearance area provided by the electronic device 100.

[0113] Please refer to Figure 12 , which is a comparison diagram of the radiation efficiency and system total efficiency of the antenna assembly 1 in some embodiments of the present application and a reference antenna assembly 1'. Among them, Figure 12 can be Figure 5The radiation efficiency and overall system efficiency of the antenna assembly 1 shown were obtained from simulation tests, as well as the aforementioned... Figure 6 The radiation efficiency and overall system efficiency are obtained from simulation tests of the reference antenna assembly 1' shown.

[0114] Among them, because the radiated energy of the N78 band is relatively concentrated and the radiation direction is usually towards the top 1D of the electronic device 100, it is prone to exceeding the SAR value limit. The first frequency band is the N78 band. Figure 12 Specifically, it can be as follows: Figure 5 The radiation efficiency and overall system efficiency obtained from simulation tests when antenna assembly 1 operates in the N78 frequency band, as well as the aforementioned... Figure 6 The radiation efficiency and overall system efficiency are obtained from simulation tests when the reference antenna assembly 1' is operating in the N78 frequency band.

[0115] in, Figure 12 The middle indicates that Figure 5 The radiation efficiency curve Se1 and the overall system efficiency curve St1 obtained from the simulation test of the antenna component 1 shown are as described above. Figure 6 The radiation efficiency curve Se2 and the overall system efficiency St2 are obtained from the simulation test of the reference antenna assembly 1' shown.

[0116] from Figure 12 It can be seen that at the three frequency points of 3.55GHz, 3.6GHz, and 3.7GHz in the N78 band, the radiation efficiency of antenna assembly 1 of this application is basically the same as that of reference antenna assembly 1'. Furthermore, at the three frequency points of 3.55GHz, 3.6GHz, and 3.7GHz in the N78 band, the overall system efficiency of antenna assembly 1 of this application (respectively...) is... Figure 12 The system overall efficiency (respectively, points 4, 5, and 6 in the reference antenna assembly 1') and the system efficiency (respectively, points 4, 5, and 6 in the reference antenna assembly 1') are respectively Figure 12 The three points 1, 2, and 3 in the text are basically the same.

[0117] Therefore, it can be seen that the antenna assembly 1 of this application can maintain the same radiation efficiency and overall system efficiency as the existing reference antenna assembly 1', that is, the antenna radiation performance is basically the same.

[0118] from Figure 12 It can also be seen that, since the antenna assembly 1 of this application has added the extension 122, although the antenna clearance may be reduced, the antenna aperture is also increased, thereby maintaining the same antenna radiation performance as the existing reference antenna assembly 1'.

[0119] Please see Figure 13, the SAR value of the antenna assembly 1 in the first frequency band is Figure 13 , the SAR value of the antenna assembly 1 in the first frequency band is Figure 5 , the SAR value of the antenna assembly 1 in the first frequency band is Figure 13 , the SAR value of the antenna assembly 1 in the first frequency band is Figure 6 , the SAR value of the antenna assembly 1 in the first frequency band is

[0120] As shown in Figure 13 , at the frequency point of 3.55GHz in the N78 frequency band, the SAR value of the reference antenna assembly 1' is 5.45W / kg (power density unit), and the SAR value of the antenna assembly 1 of the present application is 4.9W / kg, which is reduced by about 0.46dB. At the frequency point of 3.6GHz in the N78 frequency band, the SAR value of the reference antenna assembly 1' is 5.5W / kg, and the SAR value of the antenna assembly 1 of the present application is 5W / kg, which is reduced by about 0.5dB. At the frequency point of 3.7GHz in the N78 frequency band, the SAR value of the reference antenna assembly 1' is 4.78W / kg, and the SAR value of the antenna assembly 1 of the present application is 4.17W / kg, which is reduced by about 0.59dB.

[0121] It can be seen that the SAR value of the antenna assembly 1 of the present application is reduced by about 10% compared with the SAR value of the reference antenna assembly 1', which is significantly reduced. As Figure 12 can be seen from the simulation results, the antenna radiation performance of the antenna assembly 1 of the present application is basically the same as that of the reference antenna assembly 1'. Therefore, the antenna assembly 1 of the present application can effectively reduce the SAR value while ensuring the same antenna radiation performance as the reference antenna assembly 1'.

[0122] Please refer to Figure 14 , a further structural block diagram of the electronic device 100 in some embodiments of the present application. As shown in Figure 14 , the electronic device 100 includes the antenna assembly 1 and the like, and further includes a controller 5.

[0123] Among them, the controller 5 is at least used to determine whether to perform power backoff according to the duty cycle of signal transmission when the electronic device 100 transmits and receives electromagnetic wave signals in the first frequency band.

[0124] The duty cycle of the signal transmission can be a ratio of a time length of signal transmission in a preset period to a period length. The preset period can be a period set by a standardization organization, for example, a period set by a communication standardization organization of the European Union or the United States.

[0125] In some embodiments, since the energy amplitude is substantially constant during signal transmission in a preset period, the total energy in the preset period depends on the duty cycle of signal transmission in the preset period. Generally, the SAR value is derived according to the total energy in the last preset period and is positively correlated with the total energy in the last preset period.

[0126] Therefore, in the present application, the controller 5 can accurately determine whether the current SAR value exceeds the standard according to the duty cycle of signal transmission when the electronic device 100 transmits and receives electromagnetic wave signals of the first frequency band, so as to determine whether to perform power backoff.

[0127] In some embodiments, the controller 5 determines to perform power backoff when the duty cycle of signal transmission is greater than a preset duty cycle, and determines not to perform power backoff when the duty cycle of signal transmission is less than or equal to the preset duty cycle.

[0128] The total energy in the preset period depends on the duty cycle of signal transmission in the preset period and is positively correlated with the duty cycle of signal transmission in the preset period, that is, the lower the duty cycle of signal transmission in the preset period, the lower the total energy in the preset period, and the higher the duty cycle of signal transmission in the preset period, the higher the total energy in the preset period. The preset duty cycle can be obtained by testing, for example, by continuously adjusting the duty cycle in the preset period and obtaining the SAR value in real time, and then determining the duty cycle of signal transmission in the preset period when the SAR value is equal to the maximum allowed value as the preset duty cycle.

[0129] Therefore, when the duty cycle of signal transmission is greater than the preset duty cycle, it indicates that the current SAR value exceeds the standard, and when the duty cycle of signal transmission is less than or equal to the preset duty cycle, it indicates that the current SAR value does not exceed the standard.

[0130] Therefore, the controller 5 determines to perform power backoff and can control to perform power backoff when the duty cycle of signal transmission is greater than the preset duty cycle, and determines not to perform power backoff when the duty cycle of signal transmission is less than or equal to the preset duty cycle.

[0131] In some embodiments, the controller 5 can determine the duration of the signal transmission according to the duration of the power amplifier (not shown in the figure) being powered on in a preset period, and then divide the duration of the signal transmission by the preset period to determine the current duty cycle of the signal transmission. Generally, the power amplifier needs to be started when the signal transmission is performed, so the duration of the power amplifier being powered on is often equal to the duration of the signal transmission. Thus, the duration of the signal transmission can be determined according to the duration of the power amplifier (not shown in the figure) being powered on in a preset period.

[0132] The signal transmission can be uplink and downlink, i.e., receiving signal and transmitting signal. The preset duty cycle can be 32.8%.

[0133] In some embodiments, the controller 5 controlling the power backoff can be controlling the hierarchical backoff with a preset power backoff value. That is, in some embodiments, the controller 5 can control the backoff of the preset power backoff value, i.e., subtract the preset power backoff value from the current power, and then obtain the current SAR value, and then determine that the SAR value is still over-standard, and then control the continuous backoff of the preset power backoff value until the SAR value is not over-standard.

[0134] In some embodiments, the controller 5 can also determine the target power backoff value corresponding to the current duty cycle of the signal transmission according to a preset correspondence between the duty cycle and the power backoff value, and control the backoff of the target power backoff value, i.e., subtract the target power backoff value from the current power.

[0135] In some embodiments, the controller 5 controlling the power backoff can be controlling the reduction of the output power of the first feed source 11 and the like.

[0136] Thus, in the present application, by cooperating with the power backoff mechanism, the SAR value over-standard can be further avoided.

[0137] The antenna assembly 1 and the electronic device 100 of the present application can make part of the current distribution on the extension part 122 by connecting the extension part 122 to the third end D3 of the body part 121 of the first radiator 12, and can change the radiation direction of at least part of the electromagnetic wave signals to other desired directions, such as the direction with lower SAR value standard, and can effectively avoid the SAR value over-standard. In addition, each of the first radiator 12 and the second radiator 14 included in the antenna assembly 1 of the present application can support the transmission and reception of electromagnetic wave signals of at least two frequency bands, and can greatly realize multiple frequency bands with smaller antenna size, and meet the communication demand.

[0138] Among the various embodiments of the present application, each has its own focus. The contents in different embodiments can be cross-referenced without conflict.

[0139] The above description is merely a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art can easily think of changes or replacements within the technical scope disclosed by the present application, which shall be covered within the protection scope of the present application. The embodiments of the present application and the features in the embodiments can be combined with each other without conflict. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. An antenna assembly, characterized in that, include: First feed source; A first radiator includes a body and an extension. The body is elongated and includes a first end and a second end opposite each other along its length, a third end and a fourth end opposite each other along its width, and a first feed point. The first end is an open circuit, and the second end is grounded. The extension is connected to at least a portion of the third end of the body. The first feed point is located between the first end and the second end and is used to connect to a first feed source. Under the excitation of the first feed source, the first radiator generates a resonant current distribution that supports the transmission and reception of electromagnetic wave signals in at least a first frequency band. The extension is used to disperse the resonant current distribution on the body to reduce the SAR value on the side of the body away from the extension.

2. The antenna assembly according to claim 1, characterized in that, The first power supply point is located between the first end and the second end and on the first surface of the body portion. The extension portion is strip-shaped, one end of the extension portion is connected to at least a portion of the third end, and the extension portion is inclined toward the first surface of the body portion and has a preset angle with the body portion, the preset angle being greater than 0° and less than 180°.

3. The antenna assembly according to claim 2, characterized in that, The preset included angle is 90°.

4. The antenna assembly according to claim 2, characterized in that, The extension is connected to the region near the first end of the third end of the main body, and the extension is spaced apart from the second end.

5. The antenna assembly according to claim 2, characterized in that, The fourth end of the main body has a notch.

6. The antenna assembly according to claim 5, characterized in that, The projection of the notch onto the third end of the body portion at least partially overlaps with the area connected to the extension portion.

7. The antenna assembly according to claim 6, characterized in that, The dimension of the notch along the width direction of the body portion is less than 1 / 2 of the width of the body portion.

8. The antenna assembly according to claim 1, characterized in that, The length of the main body is greater than the length of the reference radiator in a reference antenna assembly, which is also used to support the transmission and reception of electromagnetic wave signals in at least the first frequency band.

9. The antenna assembly according to any one of claims 1-8, characterized in that, The antenna assembly further includes a matching unit connected between the first feed source and the first feed point. The matching unit is used to match and adjust the first radiator so that the first radiator supports the transmission and reception of electromagnetic wave signals in at least the first frequency band under the excitation of the first feed source.

10. The antenna assembly according to any one of claims 1-8, characterized in that, The antenna assembly further includes a second radiator, a second feed source, and a grounding metal component. The second radiator includes a second feed point connected to the second feed source. Under the excitation of the second feed source, the second radiator supports the transmission and reception of electromagnetic wave signals in at least the second frequency band. The grounding metal component is located between the first radiator and the second radiator and is used to at least achieve isolation between the first radiator and the second radiator.

11. The antenna assembly according to claim 10, characterized in that, The second radiator includes a fifth end and a sixth end opposite to each other along its length. The fifth end is an open circuit end, and the sixth end is grounded. The fifth end is close to and spaced apart from the grounding metal member, and the first end of the body portion of the first radiator is close to and spaced apart from the grounding metal member.

12. An electronic device, characterized in that, The electronic device includes an antenna assembly as described in any one of claims 1-11.

13. The electronic device according to claim 12, characterized in that, The electronic device also includes a display screen and a back cover. When the antenna assembly is disposed in the electronic device, the third end of the body portion of the first radiator is the end near the back cover, and the fourth end of the body portion of the first radiator is the end near the display screen.

14. The electronic device according to claim 12, characterized in that, The electronic device includes a frame, and the radiator of the antenna assembly, including the first radiator, is disposed on the frame.

15. The electronic device according to claim 14, characterized in that, The frame of the electronic device is a metal frame, and the radiator of the antenna assembly, including the first radiator, is a metal frame segment formed by opening a gap in the metal frame of the electronic device.

16. The electronic device according to claim 14, characterized in that, The frame of the electronic device is a non-metallic frame, and the radiator of the antenna assembly, including the first radiator, is a metal segment disposed in the frame of the electronic device.

17. The electronic device according to claim 12, characterized in that, The electronic device further includes a controller, which is at least used to determine whether to perform power back-off based on the duty cycle of the signal transmission when the electronic device is transmitting and receiving electromagnetic wave signals in the first frequency band.

18. The electronic device according to claim 17, characterized in that, The controller determines to perform power backoff when the duty cycle of the signal transmission is greater than a preset duty cycle, and determines not to perform power backoff when the duty cycle of the signal transmission is less than or equal to the preset duty cycle.

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