Antenna assembly and electronic device

Abstract

Embodiments of the present application provide an antenna assembly, which comprises a first antenna unit and a second antenna unit. The first antenna unit comprises a first radiating branch and a first feed source, the first radiating branch comprises a first feed point, the first feed point is connected with the first feed source, and the first feed source is used to excite the first radiating branch to generate two working modes working at a first frequency band. The second antenna unit comprises a second radiating branch, a parasitic branch and a second feed source, the second radiating branch comprises a second feed point, the second feed point is connected with the second feed source, and the parasitic branch is coupled with the second radiating branch; wherein the second feed source excites the second radiating branch through the second feed point, and excites the parasitic branch through the second radiating branch to generate three working modes working at a second frequency band. The present application also provides an electronic device. The present application can meet the demand of multiple antenna frequency bands in a limited clearance area.

Description

Technical Field

[0001] This application relates to the field of communication technology, and in particular to an antenna assembly and an electronic device having said antenna assembly. Background Technology

[0002] Currently, with the widespread adoption of 5G communication technology, people's communication experience is improving, leading to a proliferation of antennas and a growing need to support more and more antenna frequency bands. Furthermore, with the increasing prevalence of full-screen and curved screens, the available space for antennas is shrinking. Therefore, how to meet the requirements of multiple antenna frequency bands within a limited space has become a crucial issue. Summary of the Invention

[0003] This application provides an antenna assembly and an electronic device to solve the above-mentioned problems.

[0004] In a first aspect, an antenna assembly is provided, comprising a first antenna element and a second antenna element. The first antenna element includes a first radiating stub and a first feed source. The first radiating stub includes a first feed point connected to the first feed source. The first feed source is used to excite the first radiating stub to generate two operating modes operating in a first frequency band. The second antenna element includes a second radiating stub, a parasitic stub, and a second feed source. The second radiating stub includes a second feed point connected to the second feed source. The parasitic stub is coupled to the second radiating stub. The second feed source excites the second radiating stub through the second feed point and couples the parasitic stub with the second radiating stub to generate three operating modes operating in a second frequency band.

[0005] Secondly, an electronic device is also provided, the electronic device including an antenna assembly. The antenna assembly includes a first antenna element and a second antenna element. The first antenna element includes a first radiating stub and a first feed source. The first radiating stub includes a first feed point, the first feed point being connected to the first feed source. The first feed source is used to excite the first radiating stub to generate two operating modes operating in a first frequency band. The second antenna element includes a second radiating stub, a parasitic stub, and a second feed source. The second radiating stub includes a second feed point, the second feed point being connected to the second feed source. The parasitic stub is coupled to the second radiating stub. The second feed source excites the second radiating stub through the second feed point and couples the parasitic stub with the second radiating stub to generate three operating modes operating in a second frequency band.

[0006] The electronic device and antenna assembly of this application, by exciting the first radiating stub to generate two operating modes operating in the first frequency band and three operating modes operating in the second frequency band, can effectively improve the radiation performance of the first and second frequency bands. The two operating modes operating in the first frequency band are both used to ensure that the first antenna element 1 resonates at least at the center frequency of the first frequency band, thereby supporting the transmission and reception of electromagnetic wave signals in the first frequency band. The three operating modes operating in the second frequency band are used to ensure that the second antenna element resonates at three different resonant frequencies in the second frequency band, thereby supporting the transmission and reception of electromagnetic wave signals in the second frequency band. Attached Figure Description

[0007] To more clearly illustrate the technical solutions in the embodiments of this application or the background art, the accompanying drawings used in the embodiments of this application or the background art will be described below.

[0008] Figure 1 This is a simplified structural diagram of an antenna assembly in one embodiment of this application.

[0009] Figure 2 This is a simplified structural diagram of the antenna assembly and its current distribution in some embodiments of this application.

[0010] Figure 3 This is a schematic diagram of the current distribution of the first antenna element of the antenna assembly in some embodiments of this application under radiation mode.

[0011] Figure 4 This is a schematic diagram of the current distribution of the first antenna element of the antenna assembly in balanced mode in some embodiments of this application.

[0012] Figure 5 This is another simplified structural diagram of the antenna assembly 100 in some embodiments of this application.

[0013] Figure 6 This is a simplified structural diagram of the first reference antenna element in a reference antenna assembly, showing its current distribution.

[0014] Figure 7 This is a schematic diagram comparing the return loss of the first antenna element of the antenna assembly in some embodiments of this application with that of the first reference antenna element in the reference antenna assembly.

[0015] Figure 8 This is a schematic diagram comparing the overall system efficiency of the first antenna element of the antenna assembly in some embodiments of this application with that of the first reference antenna element in the reference antenna assembly.

[0016] Figure 9 This is yet another simplified structural schematic diagram of the antenna assembly in some embodiments of this application.

[0017] Figure 10 This is a schematic diagram of the internal structure of the first matching unit in some embodiments of this application.

[0018] Figure 11 This is a schematic diagram of the internal structure of the second matching unit in some embodiments of this application.

[0019] Figure 12 This is a schematic diagram showing the return loss of the first antenna element of the antenna assembly in some embodiments of this application at different first frequency bands.

[0020] Figure 13 This is another simplified structural schematic diagram of the antenna assembly in some embodiments of this application.

[0021] Figure 14 This is a schematic diagram of the return loss of the second antenna element of the antenna assembly in some embodiments of this application operating in the second frequency band.

[0022] Figure 15 This is a further simplified structural diagram of the antenna assembly in some embodiments of this application.

[0023] Figure 16 This is a structural block diagram of an electronic device in some embodiments of this application.

[0024] Figure 17 This is a planar schematic diagram of an electronic device in some embodiments of this application. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] In the description of the embodiments of this invention, it should be understood that the terms "upper," "lower," "thickness," "width," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not imply or indicate that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. The term "connection" in this application includes direct connection, indirect connection, and electrical connection, etc. In the description of the embodiments of this invention, the terms "first," "second," "third," "fourth," etc., are not specific, but are used to distinguish objects with the same name. Where there is a specification, the objects with the same name referred to by the terms "first," "second," "third," "fourth," etc., may be the same object.

[0027] Please see Figure 1 This is a simplified structural diagram of the antenna assembly 100 in one embodiment of this application. Figure 1 As shown, the antenna assembly 100 includes a first antenna element 1 and a second antenna element 2. The first antenna element 1 includes a first radiating stub 11 and a first feed 12. The first radiating stub 11 includes a first feed point F1, which is connected to the first feed 12. The first feed 12 is used to excite the first radiating stub 11 to generate two operating modes operating in the first frequency band. The second antenna element 2 includes a second radiating stub 21, a parasitic stub 22, and a second feed 23. The second radiating stub 21 includes a second feed point F2, which is connected to the second feed 23. The parasitic stub 22 is coupled to the second radiating stub 21. The second feed 23 excites the second radiating stub 21 through the second feed point F2 and excites the parasitic stub 22 through the second radiating stub 21, thereby generating three operating modes operating in the second frequency band.

[0028] Therefore, in this application, by exciting the first radiating stub 11 to generate two operating modes in the first frequency band and exciting the second radiating stub 21, and by exciting the parasitic stub 22 through the second radiating stub 21 to generate three operating modes in the second frequency band, the radiation performance of the first and second frequency bands can be effectively improved. The two operating modes in the first frequency band are used to ensure that the first antenna element 1 resonates at least at the center frequency of the first frequency band, thereby supporting the transmission and reception of electromagnetic wave signals in the first frequency band. The three operating modes in the second frequency band are used to ensure that the second antenna element 2 resonates at three different resonant frequencies in the second frequency band, thereby supporting the transmission and reception of electromagnetic wave signals in the second frequency band.

[0029] That is, in some embodiments, the two operating modes operating in the first frequency band are both used to ensure that the first antenna element 1 resonates at least at the center frequency of the first frequency band, thereby effectively improving the antenna radiation performance of the first frequency band supported by the first antenna element 1. The three operating modes operating in the second frequency band are used to ensure that the second antenna element 2 resonates at three different resonant frequencies in the second frequency band, thereby supporting a wider frequency band by resonating at multiple different resonant frequencies, thus supporting the transmission and reception of electromagnetic wave signals in a wider frequency range of the second frequency band. Therefore, this application can meet the requirements of multiple antenna frequency bands within a limited clearance area.

[0030] like Figure 1As shown, in some embodiments, the parasitic branch 22 is located between the first radiating branch 11 and the second radiating branch 21, and is adjacent to and spaced apart from both the first radiating branch 11 and the second radiating branch 21. The first radiating branch 11 includes a first end D1 and a second end D2 opposite to each other, the second radiating branch 21 includes a third end D3 and a fourth end D4 opposite to each other, and the parasitic branch 22 includes a fifth end D5 and a sixth end D6 opposite to each other. The first end D1 and the second end D2 of the first radiating branch 11 are both open circuit ends, the third end D3 of the second radiating branch 21 is an open circuit end, and the fourth end D4 is a grounding end for grounding. The fifth end D5 of the parasitic branch 22 is an open circuit end, and the sixth end D6 is a grounding end for grounding. The fifth end D5 of the parasitic branch 22 is adjacent to and spaced apart from the third end D3 of the second radiating branch 21, and the first end D1 of the first radiating branch 11 is adjacent to and spaced apart from the sixth end D6 of the parasitic branch 22.

[0031] Therefore, in some embodiments, the fifth end D5 of the parasitic stub 22, which is an open circuit, is adjacent to and spaced apart from the third end D3 of the second radiating stub 21, and coupled to the second radiating stub 21, thereby being excited by the second feed source 23 through the second radiating stub 21. Furthermore, the first end D1 of the first radiating stub 11 is adjacent to and spaced apart from the sixth end D6 of the parasitic stub 22, which is a grounded end, and can also isolate the first antenna element 1 and the second antenna element 2 to a certain extent.

[0032] In this application, "A" and "B" being adjacent and spaced apart" means that the distance between "A" and "B" is less than a preset distance, such as 1 cm, and they are spaced apart from each other. Obviously, the distance between the parasitic branch 22 and the second radial branch 21 can also be any distance that satisfies the coupling required between the two, while the distance between the parasitic branch 22 and the first radial branch 11 can be as small as possible, thereby saving overall space.

[0033] Please refer to the following: Figure 2 This is a simplified structural diagram of the antenna assembly 100 and its current distribution in some embodiments of this application.

[0034] In some embodiments, such as Figure 1 and Figure 2As shown, the first feed point F1 of the first radiating stub 11 is located near the first end D1 of the first radiating stub 11. The first radiating stub 11 also includes a ground point G1, which is located between the first feed point F1 and the second end D2. The first antenna element 1 also includes an inductive reactance element 13, which is connected between the ground point G1 and ground. The two operating modes in the first frequency band include a radiation mode and a balanced mode. The first feed source 12 excites the first radiating stub 11 to generate two opposite currents, a first current i1 from the ground point G1 to the first end D1 and a second current i2 from the ground point G1 to the second end D2, to generate the radiation mode. The first feed source 12 also excites the first radiating stub 11 to generate two currents in the same direction, a third current i3 from the first end D1 to the ground point G1 and a fourth current i4 from the ground point G1 to the second end D2, to generate the balanced mode.

[0035] Therefore, in some embodiments, by setting a ground point G1 in the first radiating branch 11 and grounding the ground point G1 through the inductive element 13, the radiation mode and the balanced mode can be effectively excited under the excitation of the first feed source 12. Furthermore, by setting the first feed point F1 of the first radiating branch 11 near the first end D1, the first feed source 12 feeds the first radiating branch 11 near the first end D1, which better excites the first radiating branch 11 to generate a first current i1 from the ground point G1 to the first end D1, a second current i2 from the ground point G1 to the second end D2, and a third current i3 from the first end D1 to the ground point G1 and a fourth current i4 from the ground point G1 to the second end D2—two currents in the same direction—thus better excitation of the radiation mode and the balanced mode.

[0036] Obviously, in some embodiments, the first feed point F1 of the first radiating branch 11 may also be located near the second end D2 of the first radiating branch 11, and the grounding point G1 may also be located between the first feed point F1 and the first end D1.

[0037] in, Figure 1 and Figure 2 The first antenna element 1 shown generally forms a structure similar to a T-antenna. The grounding point G1 is the connection node between the horizontal and vertical parts of the "T" in the T-antenna. The grounding point G1 divides the first radiating stub 11 into two stub parts, as shown below. Figure 2As shown, the grounding point G1 divides the first radiating stub 11 into a first stub portion Z1 located between the grounding point G1 and the first end D1, and a second stub portion Z2 located between the grounding point G1 and the second end D2. For the T-antenna structure, when the currents in the first stub portion Z1 and the second stub portion Z2 are opposite, the condition for generating / exciting a radiation mode is satisfied; when the currents in the first stub portion Z1 and the second stub portion Z2 are the same, the condition for generating / exciting a balanced mode is satisfied.

[0038] Since the grounding point G1 is located between the first end D1 and the second end D2, the direction from the grounding point G1 to the first end D1 is approximately opposite to the direction from the grounding point G1 to the second end D2, while the direction from the first end D1 to the grounding point G1 is approximately the same as the direction from the grounding point G1 to the second end D2. Therefore, when the first feed source 12 excites the first radiating stub 11 to generate a first current i1 from the grounding point G1 to the first end D1 and a second current i2 from the grounding point G1 to the second end D2, the current directions of the first current i1 in the first stub portion Z1 and the second current i2 in the second stub portion Z2 are approximately opposite, thus satisfying the conditions for generating the radiation mode, and the radiation mode is generated. When the first feed source 12 excites the first radiating stub 11 to generate a third current i3 from the first end D1 to the grounding point G1 and a fourth current i4 from the grounding point G1 to the second end D2, the current directions of the third current i3 in the first stub portion Z1 and the fourth current i4 in the second stub portion Z2 are approximately the same, thus satisfying the conditions for generating a balanced mode, thereby generating / exciting a balanced mode.

[0039] Therefore, the first antenna element 1 in this application can generate / excite two modes simultaneously, thereby effectively improving the radiation performance of the first frequency band.

[0040] Please refer to the following: Figure 3 This is a schematic diagram of the current distribution of the first antenna element 1 of the antenna assembly 100 in some embodiments of this application under radiation mode.

[0041] like Figure 3 As shown, in radiation mode, the first feed 12 in the first radiating stub 11 of the first antenna element 1 excites the first radiating stub 11 to generate two approximately opposite currents: a first current i1 from the ground point G1 to the first terminal D1 and a second current i2 from the ground point G1 to the second terminal D2. Figure 3As shown, the current is mainly distributed in the first branch section Z1 between the grounding point G1 and the first terminal D1 and the second branch section Z2 between the grounding point G1 and the second terminal D2. The first radiating branch 11 as a whole participates in radiation and can effectively excite the radiation mode.

[0042] Please refer to the following: Figure 4 This is a schematic diagram of the current distribution of the first antenna element 1 of the antenna assembly 100 in balanced mode in some embodiments of this application.

[0043] like Figure 4 As shown, in balanced mode, the first feed 12 in the first radiating stub 11 of the first antenna element 1 excites the first radiating stub 11 to generate two approximately symmetrical currents: a third current i3 from the first terminal D1 to the grounding point G1 and a fourth current i4 from the grounding point G1 to the second terminal D2. Figure 4 As shown, the current is also more obviously distributed in the first branch portion Z1 between the grounding point G1 and the first end D1 and the second branch portion Z2 between the grounding point G1 and the second end D2. The first radiating branch 11 as a whole participates in radiation, which can effectively excite the balance mode.

[0044] In some embodiments, such as Figures 1-4 As shown, the first radial branch 11 is bent. Figures 1-2 As shown, the first radiating branch 11 includes a first sub-branch 111 and a second sub-branch 112. The first sub-branch 111 and the second sub-branch 112 are both straight and vertically connected. The first sub-branch 111 is adjacent to the parasitic branch 22, and the grounding point G1 is located in the second sub-branch 112.

[0045] That is, in some embodiments, the first radiating branch 11 may be a generally L-shaped bent structure, which can reduce the overall size of the first radiating branch 11.

[0046] The first radiating branch 11 includes a first sub-branch 111 and a second sub-branch 112, which are two vertically connected branches that are physically divided. The first radiating branch 11 includes a first branch portion Z1 and a second branch portion Z2, which are two parts divided by the grounding point G1 of the first radiating branch 11.

[0047] Since the grounding point G1 is located in the second sub-branch 112, in some embodiments, the first branch portion Z1 located between the grounding point G1 of the first radiating branch 11 and the first end D1 may include the first sub-branch 111 and a portion of the second sub-branch 112, while the second branch portion Z2 located between the grounding point G1 of the first radiating branch 11 and the second end D2 may include another portion of the second sub-branch 112.

[0048] Obviously, in some embodiments, the grounding point G1 may also be located at the connection between the first sub-branch 111 and the second sub-branch 112. In this case, the first branch portion Z1 may be the first sub-branch 111, and the second branch portion Z2 may be the second sub-branch 112.

[0049] Among them, such as Figures 2-4 As shown, the direction of the current generated by the first radiating branch 11 is either counterclockwise or clockwise around the bent structure. That is, in some embodiments, the first radiating branch 11 is bent, in which case the direction of the first radiating branch 11 from the first end D1 to the grounding point G1, and from the grounding point G1 to the second end D2, are either counterclockwise or clockwise. For example, as... Figures 2-4 As shown, the direction of the first radiating branch 11 from the first end D1 to the grounding point G1 and the direction from the grounding point G1 to the second end D2 are clockwise from the perspective shown in the figure, while the direction of the first radiating branch 11 from the grounding point G1 to the first end D1 is counterclockwise from the perspective shown in the figure. As mentioned earlier, the first current i1 generated by the first radiating branch 11 can be from the grounding point G1 to the first end D1, and the second current i2 can be from the grounding point G1 to the second end D2, which are counterclockwise and clockwise directions respectively, and are roughly opposite, thus satisfying the conditions for the generation of the radiation mode. The third current i3 generated by the first radiating branch 11 can be from the first end D1 to the grounding point G1, and the fourth current i4 can be from the grounding point G1 to the second end D2, both of which are clockwise and are roughly the same, thus satisfying the conditions for the generation of the balanced mode.

[0050] To illustrate this more clearly, Figures 2-4 Some component labels in the text are relative to Figure 1 It may have decreased or increased. Please refer to the relevant documents for details. Figures 1-4 .

[0051] In some embodiments, such as Figures 1-4As shown, the parasitic branch 22 and the second radial branch 21 are both straight, and the first sub-branch 111, the parasitic branch 22 and the second radial branch 21 are all parallel and arranged at intervals along the length direction of the first sub-branch 111, the parasitic branch 22 and the second radial branch 21, thus presenting an overall "I" shape.

[0052] Wherein, the length direction of the first sub-branch 111, the parasitic branch 22 and the second radial branch 21 is the extension direction of the longest side of the first sub-branch 111, the parasitic branch 22 and the second radial branch 21.

[0053] In some embodiments, the electrical length of the first branch portion Z1 between the grounding point G1 and the first end D1 of the first radiating branch 11 and the electrical length of the second branch portion Z2 between the grounding point G1 and the second end D2 of the first radiating branch 11 are λ1 / 4, wherein λ1 is the wavelength corresponding to the center frequency of the first frequency band.

[0054] That is, in some embodiments, the first branch portion Z1 and the second branch portion Z2 of the first radiating branch 11 have approximately equal electrical lengths and are both approximately equal to λ1 / 4. Thus, the first branch portion Z1 and the second branch portion Z2 of the first radiating branch 11 can resonate in the first frequency band in each of the radiation mode and the balanced mode, thereby achieving dual resonance and effectively improving the radiation performance in the preset frequency band.

[0055] In some embodiments, the electrical length of the first branch portion Z1 and the second branch portion Z2 of the first radiating branch 11 may be the electrical length inherent in the first branch portion Z1 and the second branch portion Z2 of the first radiating branch 11 themselves, or may be the final equivalent electrical length of the first branch portion Z1 and the second branch portion Z2 of the first radiating branch 11 with the cooperation of the matching element.

[0056] In some embodiments, as described above, the first branch portion Z1 and the second branch portion Z2 of the first radiating branch 11 are strip-shaped, such as straight strips, bent strips, etc., and the electrical length of the first branch portion Z1 and the second branch portion Z2 of the first radiating branch 11 is approximately equal to the length of the first branch portion Z1 and the second branch portion Z2 of the first radiating branch 11. When the electrical length of the first branch portion Z1 and the second branch portion Z2 of the first radiating branch 11 is equal to the electrical length of the first branch portion Z1 and the second branch portion Z2 of the first radiating branch 11, the electrical length of the first branch portion Z1 and the second branch portion Z2 of the first radiating branch 11 is approximately equal to the length of the first branch portion Z1 and the second branch portion Z2 of the first radiating branch 11, respectively.

[0057] Specifically, when the electrical lengths of the first branch portion Z1 and the second branch portion Z2 of the first radiating branch 11 are the final equivalent electrical lengths of the first branch portion Z1 and the second branch portion Z2 of the first radiating branch 11 under the cooperation of the matching element, since the matching element will be equivalent to a certain electrical length, the electrical length of the first branch portion Z1 of the first radiating branch 11, that is, the final equivalent electrical length, is the sum of the electrical length of the first branch portion Z1 itself and the equivalent electrical length of the corresponding matching element, and the electrical length of the second branch portion Z2, that is, the final equivalent electrical length, is the sum of the electrical length of the second branch portion Z2 itself and the equivalent electrical length of the corresponding matching element.

[0058] Wherein, the lengths of the first branch portion Z1 and the second branch portion Z2 of the first radial branch 11 are the dimensions along the extension direction of the longest side of the first radial branch 11. For example, when the first radial branch 11 is straight, the extension direction of the longest side of the first branch portion Z1 and the second branch portion Z2 of the first radial branch 11 is the extension direction of the longest straight side. For another example, such as... Figures 1-4 As shown, when the first radial branch 11 is a bent strip, and the first branch portion Z1 is bent and the second branch portion Z2 is straight, the extension direction of the longest side of the first branch portion Z1 is the extension direction of the longest bent side, and the extension direction of the longest side of the second branch portion Z2 is the extension direction of the longest straight side.

[0059] In this configuration, the lengths of the first stub portion Z1 and the second stub portion Z2 of the first radiating stub 11 are essentially equal, regardless of whether their electrical length is λ1 / 4 or the equivalent electrical length under the matching element is λ1 / 4. Therefore, when the first sub-stub 111, the parasitic stub 22, and the second radiating stub 21 are all parallel and spaced apart along their length directions, and the grounding point G1 is located on the second sub-stub 112, the length of the second sub-stub 112 includes the length of the second stub portion Z2 and part of the length of the first stub portion Z1, and is greater than the length of the first sub-stub 111. Therefore, the dimensions of the first sub-stub 111, the parasitic stub 22, and the second radiating stub 21 along their length directions can be reduced, which is beneficial for reducing the overall size of the antenna assembly 100.

[0060] In some embodiments, the first frequency band is a low-frequency band, for example, it may be one of the following: B8 band (880MHz~960MHz), B20 band (791MHz~862MHz), B28 band (700MHz~800MHz), or B5 band (824MHz~896MHz). Here, B8, B20, B28, and B5 bands are terms used in 4G communication networks, and are also referred to as N8, N20, N28, and N5 bands in 5G communication networks.

[0061] Since the wavelength of the low-frequency band is longer, the electrical length required for resonance in the low-frequency band is also longer. Therefore, by setting the first radiating branch 11 to a bent shape, the overall size can be effectively reduced while meeting the electrical length requirements of the low-frequency band.

[0062] Obviously, in some embodiments, the first frequency band can also be other frequency bands, such as intermediate frequency bands, mid-high frequency bands, high frequency bands, etc. Obviously, the first radiating branch 11 is not limited to a bent shape and can be designed into any shape as needed. The parasitic branch 22 and the second radiating branch 21 are also not limited to straight strips and can also be bent or other shapes.

[0063] Please refer to the following: Figure 5 This is another simplified structural diagram of the antenna assembly 100 in some embodiments of this application. Figure 5 As shown, in some embodiments, the first radiating branch 11 of the first antenna element 1 of the antenna assembly 100 may be a straight strip, and the first radiating branch 11, the parasitic branch 22 and the second radiating branch 21 are parallel and spaced apart along the length direction of the first radiating branch 11, the parasitic branch 22 and the second radiating branch 21.

[0064] That is, in some embodiments, the first radiating stub 11 is generally straight, so the directions of the first radiating stub 11 from the first end D1 to the grounding point G1, and from the grounding point G1 to the second end D2, are completely parallel. Consequently, the directions of the first current i1 and the second current i2 are essentially opposite, while the directions of the third current i3 and the fourth current i4 are exactly the same. Therefore, the radiation mode and the balanced mode can be better excited, effectively improving the antenna radiation performance.

[0065] in, Figure 5 The structure of the antenna assembly 100 shown is similar to Figures 1-4 The difference in the structure of the antenna assembly 100 shown is that the first radiating stub 11 is elongated, while the other structures are the same. For a more detailed structure, please refer to the aforementioned description. Figures 1-4Related content.

[0066] Please see Figure 6 This is a simplified structural diagram and current distribution diagram of the first reference antenna element 1' in a reference antenna assembly 100'. Figure 6 As shown, in the reference antenna assembly 100', the first reference antenna element 1' includes a radiating stub 11' and a feed 12'. The radiating stub 11' includes a feed point F1' and a ground point G1'. The radiating stub 11' also includes two opposing ends D1' and D2'. The feed point F1' is located close to the end D1'. The ground point G1' is located between the feed point F1' and the end D2'. The feed 12' is connected to the feed point F1'. The ground point G1' is directly grounded, that is, it is not grounded through inductive elements, but is directly electrically connected to the ground through a conductive line with good conductivity and approximately zero inductive reactance.

[0067] like Figure 6 As shown, since the grounding point G1' is directly grounded, the radiating stub 11' generates only a current i1' from the grounding point G1' to the terminal D1' under the excitation of the feed 12', and as... Figure 6 As shown, the current is essentially distributed only at the ground point G1' and the end D1' of the radiating stub 11', and only the ground point G1' and the end D1' of the radiating stub 11' participate in radiation. Therefore, the direct grounding scheme of the first reference antenna element 1' can only excite the left-handed mode with the main current distribution at the ground point G1' and the end D1' of the radiating stub 11'.

[0068] Therefore, the first antenna unit 1 in this application is grounded at grounding point G1 through an inductive element 13. The inductive element 13 allows current to be distributed in the second branch portion Z2 between the second end D2 of the first radiating branch 11 and the grounding point G1, thus generating two operating modes. Compared with the first reference antenna unit 1' which only has one left-handed mode, the radiation performance can be effectively improved.

[0069] In some embodiments, the inductive reactance element 13 can be a screw. Since a screw can generally be equivalent to a certain inductive reactance, it can ensure that the first radiating branch 11 generates both a radiation mode and a balanced mode under the excitation of the first feed source 12. In some embodiments, the grounding is connected to the mid-frame of the electronic device in which the antenna assembly 100 is applied. The grounding point G1 of the first radiating branch 11 is grounded by the inductive reactance element 13 of the screw, which can achieve the effect of inductive grounding and fix the first radiating branch 11 to the mid-frame of the electronic device by screw locking, thereby improving the structural stability. In addition, since screws are inexpensive, the cost is very low.

[0070] Obviously, in other embodiments, the inductive reactance element 13 can also be other elements, such as a small inductor.

[0071] Among them, the aforementioned Figures 3-4 as well as Figure 6 The triangular-like structure shown is part of the middle frame.

[0072] Please see Figure 7 This is a schematic diagram comparing the return loss of the first antenna element 1 of the antenna assembly 100 in some embodiments of this application with the first reference antenna element 1' in the reference antenna assembly 100'. The first antenna element 1 of the antenna assembly 100 may be the aforementioned... Figures 1-5 The first antenna element 1 in any antenna assembly 100. The first reference antenna element 1' in the reference antenna assembly 100' may be... Figure 6 The first reference antenna element 1' is shown.

[0073] in, Figure 7 It indicates that Figures 1-5 The structure of the first antenna element 1 of the antenna assembly 100 shown, including the inductive reactance element 13 which is a screw, is used as an example to simulate the operation in the first frequency band, and the return loss curve S11-1 is obtained through simulation test. Figure 6 The return loss curve S11-1' is obtained from simulation testing using the first reference antenna element 1' operating in the first frequency band as an example. In a certain frequency band, the frequency corresponding to the trough of the same input return loss curve is the resonant frequency. The lower the input return loss, the lower the loss at that resonant frequency, and the higher the antenna efficiency.

[0074] like Figure 7As shown, at the resonant frequency of the first frequency band, the return loss of the first antenna element 1 of the antenna assembly 100 is approximately -7dB, while the return loss of the first reference antenna element 1' is approximately -5dB. Therefore, it can be seen that the first antenna element 1 of the antenna assembly 100 of this application, which returns to ground through the inductive element 13 at grounding point G1, achieves a 2dB reduction in return loss compared to the scheme where grounding point G1' in the first reference antenna element 1' returns directly to ground, significantly reducing loss and improving antenna efficiency.

[0075] In some embodiments, such as Figure 7 The first frequency band can be a low frequency band, and can be the B5 band (824MHz~896MHz) in the low frequency band, with a resonant frequency approximately located around 850MHz (0.85GHz).

[0076] Obviously, the same, Figure 7 This is just one example using the B5 band; as mentioned earlier, the first band can be any other band.

[0077] Please see Figure 8 This is a schematic diagram comparing the overall system efficiency of the first antenna element 1 of the antenna assembly 100 in some embodiments of this application with the first reference antenna element 1' in the reference antenna assembly 100'. The first antenna element 1 of the antenna assembly 100 may be the aforementioned... Figures 1-5 The first antenna element 1 in any antenna assembly 100. The first reference antenna element 1' in the reference antenna assembly 100' may be... Figure 6 The first reference antenna element 1' is shown.

[0078] in, Figure 8 It indicates that Figures 1-5 The structure of the first antenna element 1 of the antenna assembly 100 shown, including the inductive reactance element 13 which is a screw, is used as an example to simulate the operation in the first frequency band, and the overall system efficiency curve St1 is obtained through simulation test. Figure 6 The system overall efficiency curve St1' is obtained from simulation testing using the first reference antenna element 1' operating in the first frequency band as an example. In a certain frequency band, the frequency corresponding to the peak point of the same system overall efficiency curve is the resonant frequency point. The higher the system overall efficiency, the higher the antenna efficiency at that resonant frequency.

[0079] As can be seen from the figure, at the resonant frequency of the first frequency band, the overall system efficiency of the first antenna element 1 of the antenna assembly 100 is approximately -5.5dB, while the overall system efficiency of the first reference antenna element 1' is approximately -7dB. Therefore, the first antenna element 1 of the antenna assembly 100 of this application, which returns to ground through the inductive reactance element 13 at grounding point G1, achieves an overall system efficiency improvement of nearly 1.5dB compared to the scheme in the first reference antenna element 1' where grounding point G1' returns directly to ground, significantly improving antenna efficiency.

[0080] Among them, from Figure 7 and Figure 8 It can also be seen that the first antenna element 1 of the antenna assembly 100 of this application resonates at another resonant frequency higher than the first frequency band. This higher resonant frequency is approximately 1.15 GHz. Since this other resonant frequency is not too far from the resonant frequency of the first frequency band (currently B5 band, 0.85 GHz), it can effectively improve the performance of the first frequency band. Therefore, the aforementioned two operating modes operating in the first frequency band are both used to ensure that the first antenna element resonates at least at the center frequency of the first frequency band, thus supporting the transmission and reception of electromagnetic wave signals in the first frequency band. This can also refer to one of the two operating modes operating in the first frequency band being used to ensure that the first antenna element resonates at the center frequency of the first frequency band, and the other operating mode being used to ensure that the first antenna element resonates at the center frequency of the first frequency band and a higher resonant frequency, thus supporting the transmission and reception of electromagnetic wave signals in the first frequency band and improving the antenna radiation performance of the first frequency band.

[0081] Please see Figure 9 This is yet another simplified structural schematic diagram of the antenna assembly 100 in some embodiments of this application. For example... Figure 9 As shown, in some embodiments, the first antenna unit 1 further includes a first matching unit M1, which is connected between the first feed point F1 and ground. The equivalent electrical length of the first stub portion Z1 between the ground point G1 and the first end D1 of the first radiating stub 11 and the equivalent electrical length of the second stub portion Z2 between the ground point G1 and the second end D2 of the first radiating stub 11 and the equivalent electrical length of the first matching unit M1 are λ1 / 4, where λ1 is the wavelength corresponding to the center frequency of the first frequency band.

[0082] That is, in some embodiments, the electrical length of the first branch portion Z1 and the second branch portion Z2 of the first radiating branch 11 can be the final equivalent electrical length of the first branch portion Z1 and the second branch portion Z2 of the first radiating branch 11 under the cooperation of the first matching unit M1.

[0083] In some embodiments, the first matching unit M1 may be an adjustable matching unit, and the equivalent electrical lengths of the first stub portion Z1 and the second stub portion Z2 may be changed in cooperation with the first matching unit M1, thereby changing the supported first frequency band.

[0084] That is, in some embodiments, the first frequency band may include multiple bands. The final equivalent electrical length of the first stub portion Z1 and the second stub portion Z2 can be changed by the adjustable matching unit, so that the first frequency band of the electromagnetic wave signal supported by the first stub portion Z1 and the second stub portion Z2 can be changed, thereby supporting the transmission and reception of electromagnetic wave signals in multiple first frequency bands.

[0085] For example, as mentioned above, the first frequency band is a low-frequency band and may include multiple low-frequency bands such as the B8 band (880MHz~960MHz), the B20 band (791MHz~862MHz), the B28 band (700MHz~800MHz), and the B5 band (824MHz~896MHz). The adjustable matching unit can change the final equivalent electrical length of the first stub portion Z1 and the second stub portion Z2, thereby changing the first frequency band of the electromagnetic wave signals supported by the first stub portion Z1 and the second stub portion Z2 for transmission and reception, for example, changing from supporting the B8 band to supporting the B5 band, and so on.

[0086] The first matching unit M1 has certain matching parameter values. When the first matching unit M1 is an adjustable matching unit, the matching parameter values ​​of the first matching unit M1 can be changed. When the matching parameter values ​​of the first matching unit M1 change, the equivalent electrical length of the first matching unit M1 changes, so that the equivalent electrical length of the first stub part Z1 and the second stub part Z2 can be changed with the cooperation of the first matching unit M1, thereby changing the supported first frequency band.

[0087] Therefore, through the first matching unit M1, which is an adjustable matching unit, the first antenna unit 1 can operate in different first frequency bands as needed, thereby covering all first frequency bands, such as all low frequency bands.

[0088] Please see Figure 10 This is a schematic diagram of the internal structure of the first matching unit M1 in some embodiments of this application.

[0089] In some embodiments, the first matching unit M1 includes a plurality of matching element branches Y1 connected in parallel between the corresponding first feed point F1 and ground. Each matching element branch Y1 includes a matching element M11 and a switch SW connected in series. By enabling different matching element branches Y1, the matching parameter values ​​of the first matching unit M1 as a whole are different, thereby making the first branch portion Z1 and the second branch portion Z2 of the first radiating branch 11 have different equivalent electrical lengths under the cooperation of the first matching unit M1.

[0090] In some embodiments, when the switch SW in a matching element branch Y1 is turned on, the matching element branch Y1 is in an enabled state; when the switch SW in the matching element branch Y1 is turned off, the matching element branch Y1 is in a disabled state. Therefore, the matching element branch Y1 can be turned on by controlling the switch SW in the corresponding matching element branch Y1 to be in an enabled state. The matching parameter values ​​of different matching element branches Y1 can be different, so when different matching element branches Y1 are enabled, the first matching unit M1 as a whole exhibits different matching parameter values.

[0091] In some embodiments, the switch SW in all matching element branches Y1 can also be replaced by a single-pole multi-throw switch, one end of which is grounded and the other end can be selectively connected to one of the matching element branches Y1, while the control switches select one of the matching element branches Y1 to be grounded.

[0092] In each matching element branch Y1, the matching element M11 can be any combination of inductor and / or capacitor, and the matching parameter value can be capacitance and / or capacitance value. Figure 10 The example shown uses matching element M11 as an inductor.

[0093] In this application, the first matching element M1 is an adjustable matching unit. When the first matching unit M1 is connected between the first feed point F1 and ground, the sensitivity is high because the feed point is generally located where the current is large. Therefore, by connecting the first matching unit M1 between the first feed point F1 and ground, the matching parameter value of the first matching unit M1 can be adjusted more sensitively.

[0094] In some embodiments, the first matching unit M1 may also include an adjustable capacitor or an adjustable inductor, thereby changing the matching parameter value of the first matching unit M1 by changing the value of the adjustable capacitor or the adjustable inductor, thereby changing the equivalent electrical length of the first matching unit M1, and thus changing the equivalent electrical length of the first stub portion Z1 and the second stub portion Z2 under the cooperation of the first matching unit M1.

[0095] In some embodiments, the first frequency band supported by the first antenna unit 1 may also be a fixed first frequency band, such as the B5 band. In this case, it is not necessary to switch the frequency band through the first matching unit M1, which is an adjustable matching unit. The first matching unit M1 may be a matching unit with a fixed matching parameter value, rather than an adjustable matching unit. In some embodiments, when the first frequency band supported by the first antenna unit 1 is a fixed first frequency band, the first matching unit M1 may also be omitted, and the electrical length of the first stub portion Z1 and the second stub portion Z2 of the first radiating stub 11 may itself be λ1 / 4.

[0096] In some embodiments, such as Figure 9 As shown, the first antenna unit 1 further includes a second matching unit M2, which is connected between the first feed point F1 and the first feed source 12 to achieve impedance matching adjustment of the first frequency band.

[0097] That is, in some embodiments, the first antenna unit 1 may further include a second matching unit M2 for impedance matching adjustment, thereby further improving the antenna performance of the first frequency band.

[0098] In some embodiments, the second matching unit M2 can also implement a bandpass filtering function to allow electromagnetic wave signals of the first frequency band to pass through while filtering out electromagnetic wave signals other than the first frequency band, thereby further improving the isolation between the first antenna unit 1 and the second antenna unit 2.

[0099] The second matching unit M2 can be any combination of inductors and / or capacitors. For example, it can include inductors and capacitors connected in parallel, or inductors and capacitors connected in series, or a structure where inductors and capacitors are connected in parallel and then connected in series with another inductor or capacitor. Alternatively, it can be a structure where a series branch of a capacitor and inductor is connected in series with a capacitor or / or inductor in parallel, or a combination of the aforementioned structures. The values ​​of the capacitors and / or inductors included in the second matching unit M2 can be designed according to the current structure to meet impedance matching requirements and bandpass filtering requirements that allow signals of the first frequency band to pass through while blocking signals of other frequency bands.

[0100] Please see Figure 11 This is a schematic diagram of the internal structure of the second matching unit M2 in some embodiments of this application. For example... Figure 11As shown, the second matching unit M2 may include a first inductor L11, a first capacitor C11, a second inductor L12, and a second capacitor C12. The first inductor L11 and the first capacitor C11 are connected in parallel, and the second inductor L12 and the second capacitor C12 are connected in parallel. Then, the first inductor L11 and the first capacitor C11 connected in parallel, and the second inductor L12 and the second capacitor C12 connected in parallel are connected in series between the first feed source 12 and the first feed point F1.

[0101] in, Figure 11 This is just one example. The second matching unit M2 can also be a matching unit with other structures. For example, as mentioned above, it can also include inductors and capacitors in parallel, or inductors and capacitors in series, or a structure in which inductors and capacitors are connected in parallel and then connected in series with an inductor or capacitor, or a structure in which a series branch of capacitors and inductors are connected in series and then connected in parallel with a capacitor or / or inductor, or a combination of the aforementioned structures, etc.

[0102] in, Figure 9 The antenna assembly 100 shown is the same as the one described above. Figures 1-5 The main difference between the antenna assembly 100 shown in the figure and the antenna assembly 100 is that it also includes the first matching unit M1 and the second matching unit M2; the other structures are the same as described above. Figures 1-5 The antenna assembly 100 shown in the figure may be the same; for a more specific structure, please refer to the foregoing. Figures 1-5 Related content to the diagram.

[0103] Please see Figure 12 This is a schematic diagram illustrating the return loss of the first antenna element 1 of the antenna assembly 100 in different first frequency bands in some embodiments of this application. The first antenna element 1 of the antenna assembly 100 may be the aforementioned... Figure 9 The first antenna element 1 in the antenna assembly 100.

[0104] in, Figure 12 The following is a simulation test using the first frequency band as a low-frequency band, and the first antenna unit 1 operating in the three low-frequency bands B28, B5 and B8 after being adjusted by the first matching unit M1. The resulting schematic diagram shows the return loss of the three low-frequency bands B28, B5 and B8.

[0105] in, Figure 12The diagram illustrates the return loss curve S11-2 obtained from simulation tests when the first antenna element 1 in the antenna assembly 100 operates in the B28 frequency band, the return loss curve S11-3 obtained from simulation tests when the first antenna element 1 in the antenna assembly 100 operates in the B5 frequency band, and the return loss curve S11-4 obtained from simulation tests when the first antenna element 1 in the antenna assembly 100 operates in the B8 frequency band.

[0106] like Figure 12 As shown, at the resonant frequency of the B28 band, which is approximately 0.75 GHz, the return loss of the first antenna element 1 of the antenna assembly 100 is approximately -6.29 dB; at the resonant frequency of the B5 band, which is approximately 0.85 GHz, the return loss of the first antenna element 1 of the antenna assembly 100 is approximately -6.748 dB; and at the resonant frequency of the B8 band, which is approximately 0.91 GHz, the return loss of the first antenna element 1 of the antenna assembly 100 is approximately -10.55 dB. Therefore, when the first antenna element 1 of the antenna assembly 100 of this application switches to different low-frequency bands through the first matching unit M1, the return loss in each low-frequency band is low, enabling the first antenna element 1 to support multiple low-frequency bands with good radiation performance.

[0107] Obviously, as mentioned above, the first frequency band can also be a mid-frequency band, and multiple first frequency bands can also be multiple mid-frequency bands, etc.

[0108] Please refer back to the previous article. Figures 1-5 As shown in the attached figures, the three operating modes in the second frequency band include a first operating mode, a second operating mode, and a third operating mode. The second feed source 23 excites the second radiating stub 21 through the second feed point F2, causing the third stub portion Z3 between the third end D3 of the second radiating stub 21 and the second feed point F2 to generate the first operating mode, and causing the fourth stub portion Z4 between the fourth end D4 of the second radiating stub 21 and the second feed point F2 to generate the second operating mode. The second feed source 23 also excites the parasitic stub 22 through the second radiating stub 21, causing the parasitic stub 22 to generate the third operating mode.

[0109] That is, in some embodiments, the second radiating branch 21 is divided into two branch parts, a third branch part Z3 and a fourth branch part Z4, through the second feed point F2. The three operating modes in the second frequency band are generated by the third branch part Z3, the fourth branch part Z4 and the parasitic branch 22 of the second radiating branch 21, respectively.

[0110] As previously described, the second radiating stub 21 includes opposing third ends D3 and fourth ends D4, and the parasitic stub 22 includes opposing fifth ends D5 and sixth ends D6. The first ends D1 and D2 of the first radiating stub 11 are both open-circuit ends. The third end D3 of the second radiating stub 21 is an open-circuit end, and the fourth end D4 is a ground end for grounding. The fifth end D5 of the parasitic stub 22 is an open-circuit end, and the sixth end D6 is a ground end for grounding. The fifth end D5 of the parasitic stub 22 is adjacent to and spaced apart from the third end D3 of the second radiating stub 21, and is coupled to the second radiating stub 21. Through this structure, the second feed source 23 excites the second radiating stub 21 through the second feed point F2 and couples to excite the parasitic stub 22, thereby exciting the second antenna element 2 to generate three operating modes.

[0111] As mentioned above, the three operating modes in the second frequency band are used to enable the second antenna unit 2 to resonate at three different resonant frequencies in the second frequency band. Thus, by resonating at multiple different resonant frequencies, a wider frequency band can be supported, thereby supporting the transmission and reception of electromagnetic wave signals in the second frequency band with a wider frequency range.

[0112] In some embodiments, the electrical length of the third stub portion Z3 is λ2 / 4, where λ2 is the wavelength corresponding to the first resonant frequency supported by the first operating mode; the electrical length of the fourth stub portion Z4 is λ3 / 4, where λ3 is the wavelength corresponding to the second resonant frequency supported by the second operating mode; and the electrical length of the parasitic stub 22 is λ4 / 4, where λ4 is the wavelength corresponding to the third resonant frequency supported by the third operating mode. Thus, the third stub portion Z3, the fourth stub portion Z4, and the parasitic stub 22 can resonate at the first resonant frequency, the second resonant frequency, and the third resonant frequency, respectively, thereby enabling the second antenna element 2 to resonate at three different resonant frequencies in the second frequency band.

[0113] The three operating modes in the second frequency band can all be quarter-wavelength resonant modes with different resonant frequencies.

[0114] Generally speaking, the return loss within a certain frequency range centered on any resonant frequency is low while the radiation efficiency and overall system efficiency are high, thus satisfying the conditions for transmitting and receiving electromagnetic wave signals within a certain frequency range centered on the resonant frequency. In this application, the third stub Z3, the fourth stub Z4, and the parasitic stub 22 can resonate at the first resonant frequency, the second resonant frequency, and the third resonant frequency, respectively. The frequency range centered on each of the first resonant frequency, the second resonant frequency, and the third resonant frequency is the frequency band range supported by the second antenna unit 2. Thus, there will be three frequency bands, and the superposition of these three frequency bands can be at least the second frequency band.

[0115] In this application, the first resonant frequency, the second resonant frequency, and the third resonant frequency can be three mutually spaced frequencies within the second frequency band, and the sum of their corresponding frequency ranges can completely cover the three resonant frequencies of the second frequency band. The frequency ranges corresponding to the first, second, and third resonant frequencies can be the aforementioned frequency ranges centered on each of the first, second, and third resonant frequencies, satisfying the conditions for low return loss and high radiation efficiency and overall system efficiency, i.e., frequency ranges that meet the conditions for electromagnetic wave signal transmission and reception.

[0116] In some embodiments, the second radiating branch 21 is a straight strip, and the third branch portion Z3 and the fourth branch portion Z4 are also correspondingly straight strips. The electrical lengths of the third branch portion Z3 and the fourth branch portion Z4 can be approximately the same as their lengths. The lengths of the third branch portion Z3 and the fourth branch portion Z4 are the dimensions along the extension direction of their longest sides.

[0117] In some embodiments, the total length of the second radiating branch 21 can be determined based on the electrical length of the third branch portion Z3 being λ2 / 4 and the electrical length of the fourth branch portion Z4 being λ3 / 4; that is, the total length of the second radiating branch 21 can be approximately equal to λ2 / 4 + λ3 / 4. Furthermore, the distance between the third end D3 and the second feed point F2 is the length of the third branch portion Z3, and the distance between the fourth end D4 and the second feed point F2 is the length of the fourth branch portion Z4. Based on the distance between the third end D3 and the second feed point F2 being λ2 / 4 and the distance between the fourth end D4 and the second feed point F2 being λ3 / 4, the position of the second feed point F2 in the second radiating branch 21 can be determined, thereby ensuring that the electrical length of the third branch portion Z3 is approximately λ2 / 4 and the electrical length of the fourth branch portion Z4 is approximately λ3 / 4.

[0118] Wherein, λ3 and λ4 can be determined according to the formula Therefore, f is the frequency corresponding to the wavelength, and The dielectric constant is the square root of the dielectric constant. When the second radiating branch 21 is entirely made of metal, the dielectric constant is 1. The dielectric constant is 1; when the second radiating branch 21 is wrapped with insulating material, the dielectric constant is the dielectric constant of the insulating material.

[0119] Please see Figure 13 This is another simplified structural schematic diagram of the antenna assembly 100 in some embodiments of this application. Figure 13 The diagram highlights the differences between the second antenna element 2 in the antenna assembly 100 and the second antenna element 2 in the aforementioned antenna assembly 100. Figure 13 In the above, the structure of the first antenna element 1 is as follows: Figure 9 The structure of the first antenna unit 1 shown in the figure is illustrated by example. Obviously, the structure of the first antenna unit 1 can be the same as the structure of the first antenna unit 1 shown in any of the aforementioned figures.

[0120] like Figure 13 As shown, the second antenna element 2 further includes a third matching unit M3, which is connected between the second feed point F2 and the second feed source 23 to achieve impedance matching adjustment in the second frequency band. Therefore, through impedance matching adjustment, the second antenna element 2 as a whole can resonate better in the second frequency band, thereby improving antenna efficiency.

[0121] In some embodiments, the third matching unit M3 can also implement a bandpass filtering function to allow electromagnetic wave signals of the second frequency band to pass through while filtering out electromagnetic wave signals other than those of the second frequency band, thereby further improving the isolation between the first antenna unit 1 and the second antenna unit 2.

[0122] The third matching unit M3 can be any combination of inductors and / or capacitors. For example, it can include inductors and capacitors connected in parallel, or inductors and capacitors connected in series, or an inductor and capacitor connected in parallel and then connected in series with another inductor or capacitor. Alternatively, it can be a series branch of a capacitor and inductor connected in series and then connected in parallel with a capacitor or / or inductor. It can also be a combination of the aforementioned structures. The values ​​of the capacitors and / or inductors included in the third matching unit M3 can be designed according to the current structure to meet impedance matching requirements and bandpass filtering requirements that allow signals in the first frequency band to pass while blocking signals in other frequency bands.

[0123] In some embodiments, the structure of the third matching unit M3 may be the same as described above. Figure 11 The structure of the second matching unit M2 shown is similar. See also the aforementioned examples for details. Figure 11 The structure of the second matching unit M2 is shown.

[0124] In some embodiments, the second frequency band is a mid-to-high frequency band (mid-frequency + high-frequency). For example, the second frequency band may cover frequency bands located in the mid-to-high frequency range, such as the B1 band (1.92-2.17GHz), B3 band (1.71-1.88GHz), B39 band (1.880-1.890GHz), B40 band (2.3-2.4GHz), and B41 band (2.496-2.69GHz).

[0125] In some embodiments, the first resonant frequency of the third branch Z3 resonating in the first operating mode is approximately 1.8 GHz, and the corresponding supported frequency range basically covers the B1 band, the B39 band, and the B3 band. The second resonant frequency of the fourth branch Z4 resonating in the second operating mode is approximately 2.4 GHz, and the corresponding supported frequency range basically covers the B40 band. The third resonant frequency of the parasitic branch 22 resonating in the third operating mode is approximately 2.7 GHz, and the corresponding supported frequency range basically covers the B41 band.

[0126] Therefore, through the first antenna unit 1 and the second antenna unit 2, the antenna assembly 100 can support full coverage of low frequency, mid-high frequency and other frequency bands as a whole, and can meet the needs of multiple antenna frequency bands.

[0127] In some embodiments, since the three operating modes of the second antenna unit 2 are generated simultaneously by the third stub portion Z3, the fourth stub portion Z4, and the parasitic stub 22, the bandwidth supported by the second antenna unit 2 can simultaneously cover the second frequency band, such as the mid-to-high frequency band, without the need for frequency band switching through an adjustable matching unit. This effectively reduces the number of adjustable matching units used to adjust the electrical length and saves costs.

[0128] Please see Figure 14 This is a schematic diagram showing the return loss of the second antenna element 2 of the antenna assembly 100 in some embodiments of this application operating in the second frequency band. The second antenna element 2 of the antenna assembly 100 may be the aforementioned... Figure 13 The second antenna element 2 in the antenna assembly 100.

[0129] in, Figure 14 The return loss diagram is obtained by simulation test using the second frequency band as the mid-to-high frequency band and the second antenna unit 2 operating in the second frequency band as an example.

[0130] in, Figure 14 The diagram illustrates the return loss curve S11-5 obtained from simulation testing of the second antenna unit 2 in the antenna assembly 100 operating in the mid-to-high frequency band.

[0131] like Figure 14 As shown, within the mid-to-high frequency band, the three operating modes of the second antenna element 2 operating in the second frequency band correspond to three resonant frequencies, namely, as follows: Figure 14 As shown, and as previously mentioned, the first resonant frequency f1 is approximately 1.8 GHz, the second resonant frequency f2 is approximately 2.4 GHz, and the third resonant frequency f3 is approximately 2.7 GHz.

[0132] like Figure 14 As shown, at the first resonant frequency f1, the return loss of the second antenna element 2 of the antenna assembly 100 is approximately -5.9 dB; at the second resonant frequency f2, the return loss of the second antenna element 2 of the antenna assembly 100 is approximately -6.8 dB; and at the third resonant frequency f3, the return loss of the second antenna element 2 of the antenna assembly 100 is approximately -4.3 dB. Therefore, it can be seen that the second antenna element 2 of the antenna assembly 100 of this application has low return losses at multiple resonant frequencies in the mid-to-high frequency band, enabling the second antenna element 2 to support a relatively wide frequency band of multiple mid-to-high frequency bands.

[0133] Please see Figure 15 This is a further simplified structural diagram of the antenna assembly 100 in some embodiments of this application. Figure 15As shown, the second antenna element 2 further includes a third radiating stub 24, which is connected to the fourth end D4 of the second radiating stub 21 and is used to disperse the current of the second radiating stub 21.

[0134] That is, in some embodiments, the fourth terminal D4 of the second radiating branch 21 is also connected to the third radiating branch 24. Therefore, at least the current of the fourth branch portion Z4 of the second radiating branch 21 resonating at the second resonant frequency will be partially dispersed to the third radiating branch 24, thereby reducing the SAR (Specific Absorption Rate) value. In some embodiments, the current of the fourth branch portion Z4 of the second radiating branch 21 resonating at the second resonant frequency and the current of the third branch portion Z3 of the second radiating branch 21 resonating at the first resonant frequency will both be partially dispersed to the third radiating branch 24, effectively dispersing the current and avoiding excessive current concentration, which is beneficial for reducing the SAR value.

[0135] In some embodiments, the electrical length of the third radiating stub 24 is λ5 / 4, where λ5 is the wavelength corresponding to the third frequency band, and the third radiating stub 24 supports the transmission and reception of electromagnetic wave signals in the third frequency band under the excitation of the second feed source 23.

[0136] That is, in some embodiments, the third radiating stub 24 can also resonate in the third frequency band, thereby enabling the second antenna element 2 to further support the transmission and reception of electromagnetic wave signals in the third frequency band. This further widens the bandwidth.

[0137] In some embodiments, the third frequency band may be ultra-high frequency (greater than 3000MHz), such as the N78 band (3300MHz-3800MHz), the N79 band (4400MHz-5000MHz), etc.

[0138] In some embodiments, when the electrical length of the third radiating stub 24 is λ5 / 4 and it resonates in the third frequency band, the fourth terminal D4 of the second radiating stub 21 can also be grounded by an inductive element with a small inductive reactance value, thereby allowing more current to be distributed in the third radiating stub 24, so that the third radiating stub 24 can radiate electromagnetic wave signals in the third frequency band.

[0139] Among them, such as Figure 15 As shown, one end of the third radial branch 24 is directly connected to the fourth end D4 of the second radial branch 21, and the other end of the third radial branch 24 is an open circuit. Figure 15 As shown, the third radial branch 24 is also straight, and the third radial branch 24 is parallel to the second radial branch 21, forming a "I" shape.

[0140] in, Figure 15 The diagram highlights a further difference between the second antenna element 2 in the antenna assembly 100 and the previously mentioned second antenna element 2 in the antenna assembly 100, namely, the latter further includes the third radiating branch 24. Specifically, in... Figure 15 In the above, the structure of the first antenna element 1 is as follows: Figure 9 The structure of the first antenna unit 1 shown in the figure is illustrated as an example. Obviously, the structure of the first antenna unit 1 can also be the structure of the first antenna unit 1 shown in any of the aforementioned figures.

[0141] In some embodiments, the first feed source 12 is used to output a first feed signal to the first feed point F1 of the first radiating stub 11 to excite the first radiating stub 11 to generate a radiation mode and a balanced mode, thereby resonating as a whole in the first frequency band. The second feed source 23 outputs multiple feed signals corresponding to the first resonant frequency, the second resonant frequency, and the third resonant frequency to the second radiating stub 21 to excite the second antenna element 2 to generate three operating modes, resonating at the first resonant frequency, the second resonant frequency, and the third resonant frequency, respectively. When the second antenna element 2 further includes the third radiating stub 24 supporting the third frequency band, the second feed source 23 is also used to output multiple feed signals corresponding to the third frequency band.

[0142] The second feed source 23 can be a feed signal source obtained by the radio frequency front-end circuit (not shown in the figure) mixing the multiple feed signals through a combiner (not shown in the figure), so that the multiple feed signals can be output simultaneously.

[0143] Please see Figure 16 This is a structural block diagram of an electronic device 200 in some embodiments of this application. Wherein, as shown... Figure 16 As shown, the electronic device 200 may include the antenna assembly 100 in any of the foregoing embodiments.

[0144] Therefore, the electronic device 200, by setting the antenna assembly 100 in any of the aforementioned embodiments, can generate two operating modes in the first frequency band by stimulating the first radiating stub 11 and stimulating the second radiating stub 21, and by stimulating the parasitic stub 22 through the second radiating stub 21 to generate three operating modes in the second frequency band. This effectively improves the radiation performance of both the first and second frequency bands. Furthermore, the two operating modes in the first frequency band are used to ensure that the first antenna element 1 resonates at least at the center frequency of the first frequency band, thus supporting the transmission and reception of electromagnetic wave signals in the first frequency band. The three operating modes in the second frequency band are used to ensure that the second antenna element 2 resonates at three different resonant frequencies in the second frequency band, thus supporting the transmission and reception of electromagnetic wave signals in the second frequency band. That is, in some embodiments, the two operating modes in the first frequency band are used to ensure that the first antenna element 1 resonates at least at the center frequency of the first frequency band, thereby effectively improving the antenna radiation performance of the first frequency band supported by the first antenna element 1. The three operating modes in the second frequency band are used to make the second antenna element 2 resonate at three different resonant frequencies in the second frequency band, thereby supporting a wider frequency band by resonating at multiple different resonant frequencies, thus supporting the transmission and reception of electromagnetic wave signals in the second frequency band with a wider frequency range.

[0145] Please see Figure 17 This is a planar schematic diagram of an electronic device 200 in some embodiments of this application. For example... Figure 17 As shown, the electronic device 200 includes the antenna assembly 100. Wherein, Figure 17 This is a top view schematic diagram illustrating the structure of the antenna assembly 100, viewed from the side of the display screen of the electronic device 200, i.e., from the front. The aforementioned... Figures 1-5 as well as Figure 9 , Figure 13 and Figure 15 The antenna assembly 100 shown in the accompanying drawings is also the antenna assembly 100 viewed from the front side of the electronic device 200. (The aforementioned...) Figure 6 The reference antenna assembly 100' shown can also be an antenna assembly viewed from the front side of the electronic device to which it is applied.

[0146] in, Figure 17 The electronic device 200 shown includes Figure 15 The antenna assembly 100 shown is illustrated as an example. That is, taking... Figure 15 The example shown is an antenna assembly 100 with the most structures. Clearly, as previously stated, the electronic device 200 may include the antenna assembly 100 in any of the foregoing embodiments, that is, the antenna assembly 100 shown in any of the foregoing figures.

[0147] like Figure 17 As shown, the electronic device 200 includes a top end D11, a bottom end D12, and two side ends D13 and D14. The first radiating stub 11, the second radiating stub 21, and the parasitic stub 22 of the antenna assembly 100 are generally disposed at the bottom end D12 and / or near the bottom end D12.

[0148] That is, in some embodiments, the radiating branches and parasitic branches of the first antenna unit 1 and the second antenna unit 2 can be roughly located at the bottom D12 and / or near the bottom D12 of the electronic device 200, while other positions can be given to other antennas with higher position requirements. For example, the top D11 can be given to antennas such as GPS antennas, which facilitates the overall layout of the antenna radiating branches in the electronic device 200.

[0149] Among them, such as Figure 17 When the second antenna unit 2 further includes a third radiating branch 24, the third radiating branch 24 is also disposed at the bottom end D12 and / or near the bottom end D12 of the electronic device 200.

[0150] like Figure 17 As shown, the first radial branch 11 is generally bent, including a first sub-branch 111 and a second sub-branch 112 connected vertically, while the second radial branch 21 and the parasitic branch 22 are straight. Figure 17 The first sub-branch 111, the second radial branch 21, and the parasitic branch 22 are located at the bottom end D12, and the second sub-branch 112 is located at the side end D13 near the bottom end D12. Figure 17 As shown, when the second antenna unit 2 further includes a third radiating branch 24, the third radiating branch 24 is also disposed on the bottom end D12 of the electronic device 200, and together with the second sub-branch 112, the second radiating branch 21 and the parasitic branch 22, it is disposed on the bottom end D12 of the electronic device 200.

[0151] Obviously, in some embodiments, when the antenna assembly 100 is Figure 5 When the antenna assembly 100 shown is configured such that the first radiating branch 11 is also straight, and the first radiating branch 11, the parasitic branch 22, and the second radiating branch 21 are parallel and spaced apart along the length direction of the first radiating branch 11, the parasitic branch 22, and the second radiating branch 21, the first radiating branch 11, the parasitic branch 22, the second radiating branch 21, and the third radiating branch 24 can all be located at the bottom D12 of the electronic device 200.

[0152] In this application, the use of directional terms such as "top" and "bottom" when describing the electronic device 200 is primarily based on the orientation of the device when held and used by the user. "Top" refers to the position facing the top of the electronic device 200, and "bottom" refers to the position facing the bottom. This does not imply that the device or component must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation on the orientation of the electronic device 200 in a real-world application scenario. In some embodiments, the bottom of the electronic device 200 may be the end with a headphone jack and a USB port, while the top of the electronic device 200 may refer to the end opposite to the end with the headphone jack and USB port, or it may refer to the end with a camera, receiver, etc.

[0153] As mentioned above, Figure 17 merely with Figure 15 The example shown is an antenna assembly 100 with the most structures. Clearly, as previously stated, the electronic device 200 may include the antenna assembly 100 of any of the foregoing embodiments, that is, the antenna assembly 100 shown in any of the foregoing figures. For example, the electronic device 200 may include... Figure 1 The antenna assembly 100 shown may have a first antenna element 1 that does not include the first matching element M1, and a second antenna element 2 that does not include the third radiating stub 24, etc.

[0154] Among them, such as Figure 17 As shown, the electronic device 200 includes a frame B1, and the aforementioned first radiating branch 11, second radiating branch 21, and parasitic branch 22 can be metal segments disposed on the frame B1. For example, when the first radiating branch 11, second radiating branch 21, and parasitic branch 22 are disposed at the bottom end D12 of the electronic device 200, the first radiating branch 11, second radiating branch 21, and parasitic branch 22 can be disposed on the portion of the frame B1 located at the bottom end D12 of the electronic device 200.

[0155] In some embodiments, the frame B1 may be a metal frame, and the first radiating branch 11, the second radiating branch 21, and the parasitic branch 22 may be metal frame segments formed by opening a gap X1 in the metal frame.

[0156] In some embodiments, the frame B1 of the electronic device 200 may also be a non-metallic frame, and the first radiating branch 11, the second radiating branch 21 and the parasitic branch 22 may be metal segments disposed in the frame B1 of the electronic device 200, and are also spaced apart from each other by a gap X1.

[0157] That is, in some embodiments, the frame B1 of the electronic device 200 may also be a non-metallic frame with low conductivity, such as plastic, ceramic, etc. The first radiating branch 11, the second radiating branch 21, and the parasitic branch 22 are metal segments disposed in the frame B1 of the electronic device 200, for example, metal segments attached to the inner sidewall of the frame B1 of the electronic device 200.

[0158] That is, in some embodiments of this application, the first radiating branch 11, the second radiating branch 21 and the parasitic branch 22 can be directly formed by the frame B1, or carried and fixed on the frame B1.

[0159] Obviously, when the second antenna element 2 of the antenna assembly 100 further includes a third radiating branch 24, the third radiating branch 24 can also be a metal segment disposed on the frame B1, for example, it can be disposed on the portion of the frame B1 located at the bottom D12 of the electronic device 200. Furthermore, when the frame B1 is a metal frame, it can be a metal frame segment formed by opening a gap X1, or when the frame B1 is a non-metal frame, it can be a metal segment disposed within the frame B1 of the electronic device 200, and so on.

[0160] In some embodiments, the first radiating branch 11, the second radiating branch 21, and the parasitic branch 22 may be fixedly disposed on the antenna bracket formed of insulating material, and then fixed to the electronic device 200 by the antenna bracket.

[0161] In some embodiments, the antenna support may be made of LCP (Liquid Crystal Polymer). In other embodiments, the antenna support may be made of other insulating materials, such as plastics, resins, rubber, etc.

[0162] In some embodiments, the first radiating branch 11, the second radiating branch 21, and the parasitic branch 22 are fixedly disposed on the antenna bracket formed of insulating material, and then fixed to the corresponding position in the electronic device 200 by the antenna bracket, for example, near the bottom D12 of the electronic device 200.

[0163] Among them, such as Figure 17 As shown, the electronic device 200 also includes a middle frame 201, which serves as the overall ground of the electronic device 200 and provides ground potential.

[0164] Specifically, the aforementioned fourth end D4 of the second radiating branch 21 and the sixth end D6 of the parasitic branch 22, as well as the aforementioned grounding point G1, are connected to the middle frame 201 and grounded.

[0165] like Figure 17 As shown, the electronic device 200 also includes a motherboard 202, wherein the aforementioned first feed source 12, second feed source 23, first matching unit M1, second matching unit M2, and third matching unit M3 are specifically disposed on the motherboard 202. Figure 17 This is merely a schematic diagram. For ease of illustration, the first feed source 12, the second feed source 23, the first matching unit M1, the second matching unit M2, and the third matching unit M3 are all located outside the motherboard 202. In reality, the first feed source 12, the second feed source 23, the first matching unit M1, the second matching unit M2, and the third matching unit M3 can be located on the motherboard 202.

[0166] The electronic device 200 also includes a memory, a battery, etc., which are not relevant to the improvements in this application and will not be described in detail.

[0167] The electronic device 200 described in this application can be any electronic device with an antenna, such as a mobile phone, tablet computer, or laptop computer.

[0168] The electronic device 200 and its antenna assembly 100 of this application, by exciting the first radiating stub 11 to generate two operating modes operating in the first frequency band and three operating modes operating in the second frequency band, can effectively improve the radiation performance of the first and second frequency bands. Furthermore, the two operating modes operating in the first frequency band are both used to ensure that the first antenna element 1 resonates at least at the center frequency of the first frequency band, thus supporting the transmission and reception of electromagnetic wave signals in the first frequency band. The three operating modes operating in the second frequency band are used to ensure that the second antenna element 2 resonates at three different resonant frequencies in the second frequency band, thus supporting the transmission and reception of electromagnetic wave signals in the second frequency band. That is, in some embodiments, the two operating modes operating in the first frequency band are both used to ensure that the first antenna element 1 resonates at least at the center frequency of the first frequency band, thereby effectively improving the antenna radiation performance of the first frequency band supported by the first antenna element 1. The three operating modes in the second frequency band are used to make the second antenna element 2 resonate at three different resonant frequencies in the second frequency band, thereby supporting a wider frequency band by resonating at multiple different resonant frequencies, thus supporting the transmission and reception of electromagnetic wave signals in the second frequency band with a wider frequency range.

[0169] The various embodiments of this application have their own emphasis, and some embodiments do not focus on the structure described in particular. In the absence of conflict, the content of the corresponding structure in other embodiments can be referred to.

[0170] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Where there is no conflict, the embodiments and features in the embodiments of this application can be combined with each other. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An antenna assembly, characterized in that, The antenna assembly includes: The first antenna element includes a first radiating stub and a first feed source. The first radiating stub includes a first feed point, which is connected to the first feed source. The first feed source is used to excite the first radiating stub to generate two operating modes operating in the first frequency band. The second antenna element includes a second radiating stub, a parasitic stub, and a second feed source. The second radiating stub includes a second feed point connected to the second feed source. The parasitic stub is coupled to the second radiating stub. The second feed source excites the second radiating stub through the second feed point and excites the parasitic stub through the second radiating stub to generate three operating modes operating in the second frequency band. The parasitic branch is located between the first radiating branch and the second radiating branch, and is adjacent to and spaced apart from both the first radiating branch and the second radiating branch. The first radiating branch includes a first end and a second end opposite to each other, the second radiating branch includes a third end and a fourth end opposite to each other, and the parasitic branch includes a fifth end and a sixth end opposite to each other. The first end and the second end of the first radiating branch are both open circuit ends, the third end of the second radiating branch is an open circuit end and the fourth end is a grounded end, the fifth end of the parasitic branch is an open circuit end and the sixth end is a grounded end, the fifth end of the parasitic branch is adjacent to and spaced apart from the third end of the second radiating branch, and the first end of the first radiating branch is adjacent to and spaced apart from the sixth end of the parasitic branch. The first feed point of the first radiating stub is located near the first end of the first radiating stub. The first radiating stub also includes a ground point located between the first feed point and the second end. The first antenna element also includes an inductive reactance element connected between the ground point and ground. The two operating modes in the first frequency band include a radiation mode and a balanced mode. The first feed excites the first radiating stub to generate two opposite currents, a first current from the ground point to the first end and a second current from the ground point to the second end, to generate the radiation mode. The first feed also excites the first radiating stub to generate two currents in the same direction, a third current from the first end to the ground point and a fourth current from the ground point to the second end, to generate the balanced mode. The three operating modes in the second frequency band include a first operating mode, a second operating mode, and a third operating mode. The second feed source excites the second radiating stub through the second feed point, causing the third stub portion between the third end of the second radiating stub and the second feed point to generate the first operating mode, and causing the fourth stub portion between the fourth end of the second radiating stub and the second feed point to generate the second operating mode. The second feed source couples and excites the parasitic stub through the second radiating stub, causing the parasitic stub to generate the third operating mode.

2. The antenna assembly according to claim 1, characterized in that, The two operating modes operating in the first frequency band are both used to ensure that the first antenna element resonates at least at the center frequency of the first frequency band, thereby supporting the transmission and reception of electromagnetic wave signals in the first frequency band. The three operating modes operating in the second frequency band are used to ensure that the second antenna element resonates at three different resonant frequencies in the second frequency band, thereby supporting the transmission and reception of electromagnetic wave signals in the second frequency band.

3. The antenna assembly according to claim 1, characterized in that, The first radiating branch includes a first sub-branch and a second sub-branch. Both the first and second sub-branchs are straight and vertically connected. The first sub-branch is adjacent to the parasitic branch, and the grounding point is located in the second sub-branch.

4. The antenna assembly according to claim 1, characterized in that, The inductive element is a screw, and the grounding point of the first radiating branch is grounded through the screw.

5. The antenna assembly according to any one of claims 1-4, characterized in that, The electrical length of the first branch portion between the grounding point and the first end of the first radiating branch, and the electrical length of the second branch portion between the grounding point and the second end of the first radiating branch, are λ1 / 4, where λ1 is the wavelength corresponding to the center frequency of the first frequency band.

6. The antenna assembly according to claim 5, characterized in that, The first antenna unit further includes a first matching unit, which is connected between the first feed point and ground. The equivalent electrical length of the first stub portion between the ground point and the first end of the first radiating stub, with the cooperation of the first matching unit, and the equivalent electrical length of the second stub portion between the ground point and the second end of the first radiating stub, with the cooperation of the first matching unit, are λ1 / 4.

7. The antenna assembly according to claim 6, characterized in that, The first matching unit is an adjustable matching unit. The equivalent electrical length of the first stub portion and the second stub portion can be changed with the cooperation of the first matching unit, thereby changing the supported first frequency band.

8. The antenna assembly according to claim 7, characterized in that, The first frequency band is a low-frequency band and includes one of B28, B5, B8 and B20.

9. The antenna assembly according to claim 1, characterized in that, The first antenna unit further includes a second matching unit, which is connected between the first feed point and the first feed source to achieve impedance matching adjustment of the first frequency band.

10. The antenna assembly according to claim 1, characterized in that, The electrical length of the third branch is λ2 / 4, where λ2 is the wavelength corresponding to the first resonant frequency supported by the first operating mode; the electrical length of the fourth branch is λ3 / 4, where λ3 is the wavelength corresponding to the second resonant frequency supported by the second operating mode; the electrical length of the parasitic branch is λ4 / 4, where λ4 is the wavelength corresponding to the third resonant frequency supported by the third operating mode.

11. The antenna assembly according to claim 10, characterized in that, The second antenna unit further includes a third matching unit, which is connected between the second feed point and the second feed source to achieve impedance matching adjustment of the second frequency band.

12. The antenna assembly according to claim 1, characterized in that, The second frequency band is a mid-to-high frequency band.

13. The antenna assembly according to claim 12, characterized in that, The second antenna element further includes a third radiating stub, which is connected to the fourth end of the second radiating stub and is used to disperse the current of the second radiating stub.

14. The antenna assembly according to claim 13, characterized in that, The electrical length of the third radiating stub is λ5 / 4, where λ5 is the wavelength corresponding to the third frequency band. The third radiating stub supports the transmission and reception of electromagnetic wave signals in the third frequency band under the excitation of the second feed source.

15. An electronic device, characterized in that, The electronic device includes an antenna assembly as described in any one of claims 1-14.

16. The electronic device according to claim 15, characterized in that, The electronic device includes a frame, and the first radiating branch, the second radiating branch, and the parasitic branch are metal segments disposed on the frame.

17. The electronic device according to claim 16, characterized in that, The first radiating branch, the second radiating branch, and the parasitic branch are mounted in the electronic device via an antenna bracket.

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