Antenna assembly and mobile terminal

Abstract

The invention provides an antenna assembly and a mobile terminal. The antenna assembly comprises a first antenna and a second antenna, a gap is formed between the first end of the first antenna and the first end of the second antenna, and the second end of the first antenna and the second end of the second antenna are grounded; a branch knot is arranged on the second antenna; the branch extends from the second antenna to the middle frame; the branch knot is connected with a capacitive and / or inductive device; or the branch connection is equivalent to a structure of a capacitor and / or an inductor. According to the antenna assembly provided by the invention, the branch knot connected with the capacitive and / or inductive device is arranged on the second antenna, so that the movement of the radiation efficiency pit of the original antenna assembly can be changed, and the performance of the antenna assembly is improved.

Description

Technical Field

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

[0002] The current antenna solutions for mobile terminals such as mobile phones generally adopt the design of parasitic branches to achieve the purposes of enhancing the radiation gain of the antenna, adjusting the phase distribution of the antenna and improving the anti-interference ability of the antenna.

[0003] For some antennas with special requirements, the original parasitic branches are usually lengthened to improve the left-hand circular polarization performance of the antenna. However, the lengthened parasitic branches will cause a loop mode to appear at the end of the branch, resulting in a huge efficiency pit in the WiFi frequency band.

[0004] Therefore, it is necessary to design a new type of antenna assembly and mobile terminal to solve this problem. Summary of the invention

[0005] The purpose of the present application is to provide an antenna assembly and a mobile terminal to solve the problem that the second antenna part affects the antenna performance.

[0006] The present application provides an antenna assembly, including: a first antenna and a second antenna, a gap is formed between the first end of the first antenna and the first end of the second antenna, the second end of the first antenna and the second end of the second antenna are grounded; a branch is provided on the second antenna; the branch extends from the second antenna toward the middle frame; the branch is connected to a capacitive and / or inductive device; or the branch is connected to a structure equivalent to a capacitor and / or an inductor.

[0007] Furthermore, the length of the branch corresponds to one quarter to one half of the operating frequency of the antenna assembly.

[0008] Furthermore, the width of the branch is greater than or equal to 1 mm and less than or equal to 3 mm.

[0009] Furthermore, one end of the capacitor and the inductor is electrically connected to the branch, and the other end is grounded.

[0010] Further, a difference between a distance between the branch and the second end of the second antenna and a distance between the branch and the first end of the second antenna is smaller than a set threshold.

[0011] Further, the difference is 0, and the branch is electrically connected to the capacitor and the inductor; or the difference is greater than 0, and the branch is electrically connected to the capacitor; or the difference is less than 0, and the branch is electrically connected to the inductor.

[0012] Furthermore, the length of the second antenna is greater than or equal to 10 mm and less than or equal to 30 mm.

[0013] Furthermore, the second antenna includes a grounding point; the antenna assembly also includes a third antenna and a fourth antenna; a gap is formed between the first end of the third antenna and the first end of the fourth antenna, and the second end of the third antenna and the second end of the fourth antenna are grounded.

[0014] Furthermore, the first antenna is provided with a first feeding point and a second feeding point; the third antenna is provided with a third feeding point; and the fourth antenna is provided with a fourth feeding point.

[0015] The present application provides a mobile terminal, comprising the above-mentioned antenna assembly.

[0016] The antenna assembly provided in the present application can change the movement of the original antenna assembly radiation efficiency pit by setting branches connected to capacitive and / or inductive devices on the second antenna, thereby improving the performance of the antenna assembly.

[0017] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present specification. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the specification and, together with the description, serve to explain the principles of the specification.

[0019] Figure 1 is a schematic diagram of the antenna assembly of the present application, wherein only a portion of the antenna assembly is shown.

[0020] Figure 2 yes Figure 1 Schematic diagram of the electrical connection of the branches of the antenna component to the inductor and / or capacitor.

[0021] Figure 3 This is the current distribution diagram when the antenna component is not equipped with branches.

[0022] Figure 4 yes Figure 1 The current distribution diagram of the antenna assembly is shown.

[0023] Figure 5 This is the radiation efficiency diagram of the antenna component without branches.

[0024] Figure 6 yes Figure 1 Radiation efficiency diagram of the antenna assembly shown.

[0025] Explanation of the accompanying drawings: 10, middle frame; 20, first connecting part; 30, second connecting part; 40, first antenna; 41, first feeding point; 42, second feeding point; 50, second antenna; 51, branch; 52, third antenna; 53, third feeding point; 54, grounding point; 60, first slot; 70, second slot; 80, third connecting part; 90, fourth antenna; 91, fourth feeding point. DETAILED DESCRIPTION

[0026] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementations described in the following exemplary embodiments do not represent all implementations consistent with this specification. Instead, they are merely examples of devices and methods consistent with some aspects of this specification as detailed in the appended claims.

[0027] The terms used in this application are only for the purpose of describing specific embodiments and are not intended to limit this application. Unless otherwise defined, the technical terms or scientific terms used in this specification should be understood by people with ordinary skills in the field to which this application belongs. The words "first", "second" and similar words used in this specification and claims do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "one" or "one" do not indicate a quantitative limit, but indicate the existence of one. "Multiple" or "several" means two or more. Unless otherwise specified, words such as "front", "rear", "lower" and / or "upper" are only for the convenience of explanation and are not limited to one position or one spatial orientation. Words such as "include" or "comprise" mean that the elements or objects appearing in front of "include" or "comprise" include the elements or objects listed after "include" or "comprise" and their equivalents, and do not exclude other elements or objects. Words such as "connect" or "connected" are not limited to physical or mechanical connections, and can include electrical connections, whether direct or indirect.

[0028] The terms used in this specification are for the purpose of describing specific embodiments only and are not intended to limit the present application. The singular forms of "a", "the" and "the" used in this specification and the appended claims are also intended to include plural forms unless the context clearly indicates otherwise. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more associated listed items.

[0029] Next, the embodiments of this specification are described in detail.

[0030] Please refer to Figure 1 As shown, the present application provides an antenna assembly, including: a middle frame 10, a first connection portion 20, a second connection portion 30, a first antenna 40, a second antenna 50, and a branch 51 disposed on the second antenna 50. The first connection portion 20 and the second connection portion 30 extend in the same direction relative to the middle frame 10. The first connection portion 20 connects the middle frame 10 and the first antenna 40, and the second connection portion 30 connects the middle frame 10 and the second antenna 50. The middle frame 10, the first connection portion 20, the second connection portion 30 and the second antenna 50 form a T-shaped slot. The T-shaped slot includes a first slot 60 and a second slot 70 that are connected. The first slot 60 is located between the middle frame 10 and the first antenna 40 and the second antenna 50, and the second slot 70 is located between the first end of the first antenna 40 and the first end of the second antenna 50, so that a gap is formed between the first end of the first antenna 40 and the first end of the second antenna 50. The second end of the first antenna 40 and the second end of the second antenna 50 are grounded. The branch 51 extends from the second antenna 50 into the first slot 60 in the direction toward the middle frame 10. The branch 51 is connected to a capacitive and / or inductive device, or the branch 51 is connected to a structure equivalent to a capacitor and / or an inductor.

[0031] For some people who want to add satellite call function to the original antenna assembly, and satellite communication usually uses circularly polarized signals, in order to improve the left-hand circular polarization performance of the antenna assembly, a new antenna (such as the second antenna 50 of the present application) is usually added to the original antenna structure design, and the length of the second antenna 50 is usually greater than or equal to 10mm and less than or equal to 30mm. However, although the second antenna 50 can improve the overall left-hand circular polarization performance of the antenna assembly as a perturbation unit, it will also bring some negative effects:

[0032] Please refer to Figure 3 and Figure 5 As shown, the addition of the second antenna 50 causes the current mode of the antenna assembly to enter the Loop mode, and a 3dB efficiency pit will be generated in the 5G frequency band, affecting the performance of the antenna assembly.

[0033] Therefore, in order to solve this problem, the antenna assembly provided in the present application is provided with a branch 51 extending into the first slot 60 on the second antenna 50, and the branch 51 is electrically connected to the inductor and / or capacitor, please refer to Figure 5 and Figure 6 As shown, the movement of the original antenna component radiation efficiency pit can be changed, thereby improving the performance of the antenna; at the same time, please refer to Figure 3 and Figure 4 As shown, due to the addition of the branch 51, the current mode of the antenna component can be further adjusted to break the original current loop mode.

[0034] Optionally, the first connection portion 20 and the second connection portion 30 are separately provided with the middle frame 10 and fixed by welding.

[0035] The difference between the distance between the branch 51 and the second end of the second antenna 50 and the distance between the branch 51 and the first end of the second antenna 50 is less than a set threshold. Specifically, when the difference is 0, the branch 51 is electrically connected to the capacitor and the inductor; when the difference is greater than 0, the branch 51 is electrically connected to the capacitor; or when the difference is less than 02, the branch 51 is electrically connected to the inductor.

[0036] Please refer to Figure 2 As shown, the capacitor and the inductor are arranged on the PCB board of the mobile terminal, one end of the capacitor and / or the inductor is connected to the branch 51 through a connecting wire, and the other end is grounded. The branch 51 includes a connecting end connected to the second antenna 50 and a protruding end opposite to the connecting end. The protruding end of the branch 51 is electrically connected to the connecting wire.

[0037] The width W1 of the first groove 60 and the second groove 70 is greater than or equal to 1 mm and less than or equal to 3 mm. The width W2 of the branch 51 is greater than or equal to 1 mm and less than or equal to 3 mm.

[0038] The length L1 of the branch 51 corresponds to one quarter to one half of the wavelength corresponding to the working frequency of the antenna component, that is, greater than or equal to one quarter and less than or equal to one half of the wavelength corresponding to the working frequency of the antenna component.

[0039] The second antenna 50 includes a grounding point 54. Optionally, the grounding point 54 is connected to a 0Ω resistor to achieve grounding. The length L2 of the second antenna 50 is greater than or equal to 10 mm and less than or equal to 30 mm.

[0040] The antenna assembly further includes a third antenna 52, a third connecting portion 80 extending from the middle frame 10, and a fourth antenna 90 extending from the third connecting portion 80 toward the third antenna 52. The middle frame 10, the second connecting portion 30, the third connecting portion 80, the third antenna 52, and the fourth antenna 90 form a T-shaped slot, so that a first end of the third antenna 52 and a first end of the fourth antenna 90 form a gap, and a second end of the third antenna 52 and a second end of the fourth antenna 90 are grounded.

[0041] The first antenna 40 includes a first feeding point 41 and a second feeding point 42 , so that the first antenna 40 has the functions of a GPS L1+Wifi 2.4G antenna and a Wifi 5G antenna.

[0042] The third antenna 52 includes a third feeding point 53, so that the second antenna 50 has a medium and high frequency antenna function, and the third antenna 52 is electrically connected to a satellite communication module arranged on the PCB board of the mobile terminal to realize the satellite communication function.

[0043] The fourth antenna 90 includes a fourth feeding point 91 , so that the fourth antenna 90 has an N78 or N79 antenna function.

[0044] The antenna model mentioned in this application is only one embodiment of the present application for realizing satellite communication. Various other feasible antenna models are also within the protection scope of this application, and this application does not impose any restrictions on this.

[0045] Please refer to Figures 1 to 6 As shown, the antenna assembly provided in the present application is provided with a longer second antenna 50 in order to improve the left-hand circular polarization performance of the antenna. Figure 2 and Figure 4 As shown, at this time, the current in the original antenna component forms a loop mode, and the radiation efficiency is also high in the operating frequency range of the antenna component between 5.2-5.8 GHz.

[0046] Therefore, in order to solve this problem, the present application provides a branch 51 protruding into the first slot 60 on the second antenna 50, and the branch 51 is electrically connected to the capacitor and / or inductor at different positions of the second antenna 50, see Figure 1 , Figure 4 and Figure 6 As shown, the loop mode can be eliminated in the original current of the antenna component, and the radiation efficiency can be improved by 3dB in the working frequency range of 5.2-5.8GHz of the antenna component. At the same time, the present application only draws out a branch 51 from the second antenna 50, so the structural design is simpler.

[0047] The present application also provides a mobile terminal, including the above-mentioned antenna assembly. The mobile terminal includes but is not limited to a mobile phone, a tablet personal computer, a laptop computer, a personal digital assistant (PDA), a personal computer, a notebook computer, a vehicle-mounted device, a wearable device, a walkman, a radio, etc. Among them, the wearable device includes but is not limited to a smart bracelet, a smart watch, a smart head-mounted display, smart glasses, etc.

[0048] Those skilled in the art will readily appreciate other embodiments of the specification after considering the specification and practicing the invention claimed herein. The specification is intended to cover any variations, uses or adaptations of the specification that follow the general principles of the specification and include common knowledge or customary techniques in the art that are not claimed in the specification. The specification and examples are to be considered exemplary only, and the true scope and spirit of the specification are indicated by the following claims.

[0049] It should be understood that the present description is not limited to the precise structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present description is limited only by the appended claims.

[0050] The above description is only a preferred embodiment of this specification and is not intended to limit this specification. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of this specification should be included in the scope of protection of this specification.

Claims

1. An antenna assembly, characterized in that: include: A first antenna and a second antenna; a gap is formed between the first end of the first antenna and the first end of the second antenna, and the second end of the first antenna and the second end of the second antenna are grounded; a branch is provided on the second antenna; the branch extends from the second antenna toward the middle frame; the branch is connected to a capacitive and / or inductive device; or the branch is connected to a structure equivalent to a capacitor and / or an inductor.

2. The antenna assembly according to claim 1, characterized in that: The length of the branch corresponds to one quarter to one half of the operating frequency of the antenna assembly.

3. The antenna assembly according to claim 2, characterized in that: The width of the branch is greater than or equal to 1 mm and less than or equal to 3 mm.

4. The antenna assembly according to claim 1, characterized in that: One end of the capacitor and the inductor is electrically connected to the branch, and the other end is grounded.

5. The antenna assembly according to claim 1, characterized in that: A difference between a distance between the branch and the second end of the second antenna and a distance between the branch and the first end of the second antenna is smaller than a set threshold.

6. The antenna assembly according to claim 5, characterized in that: The difference is 0, and the branch is electrically connected to the capacitor and the inductor; or the difference is greater than 0, and the branch is electrically connected to the capacitor; or the difference is less than 0, and the branch is electrically connected to the inductor.

7. The antenna assembly according to claim 6, characterized in that: The length of the second antenna is greater than or equal to 10 mm and less than or equal to 30 mm.

8. The antenna assembly according to claim 6, characterized in that: The second antenna includes a grounding point; the antenna assembly also includes a third antenna and a fourth antenna; a gap is formed between the first end of the third antenna and the first end of the fourth antenna, and the second end of the third antenna and the second end of the fourth antenna are grounded.

9. The antenna assembly according to claim 8, characterized in that: The first antenna is provided with a first feeding point and a second feeding point; the third antenna is provided with a third feeding point; and the fourth antenna is provided with a fourth feeding point.

10. A mobile terminal, characterized in that: The invention comprises the antenna assembly as claimed in any one of claims 1 to 9.

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