CN220420901U - Antenna assembly and terminal equipment - Google Patents

Abstract

The utility model provides an antenna assembly and terminal equipment, and belongs to the technical field of antennas. The antenna assembly comprises a first antenna and a circuit structure; the first antenna is arranged on a middle frame structure of the terminal equipment; the circuit structure is arranged on the middle frame structure and is coupled with the first antenna, and the circuit structure is equivalent to a circuit comprising an inductor and/or a capacitor. The antenna assembly can solve the problems of coupling and matching of adjacent antennas by utilizing the circuit structure arranged on the middle frame structure, and can effectively improve the performances of isolation, radiation efficiency and the like between the adjacent antennas.

Description

Antenna assembly and terminal equipment

Technical Field

The present utility model relates to the field of antenna technologies, and in particular, to an antenna assembly and a terminal device.

Background

With the continuous development of 5G communication, the frequency bands required by the existing terminal equipment are continuously increased, and all the frequency bands including 2, 3, 4 and 5G are required. The antennas comprise increasing frequency bands and the number of antennas to be designed for the terminal equipment is increasing, so that the problem of coupling between antennas, i.e. the problem of deterioration of the isolation of the antennas, has to be faced.

The decoupling method commonly used in the related art is to add discrete devices such as a capacitor and an inductor, construct a filtering module in a matching circuit, filter out the current in a specific frequency band and improve the isolation. However, the method can increase the use cost of the device and increase the stacking difficulty in the terminal equipment; meanwhile, the discrete devices can increase the density of the matching circuit devices, and the later debugging difficulty is increased.

Disclosure of Invention

The utility model provides an antenna assembly and terminal equipment, which can solve the problems of high cost, high stacking difficulty, high later debugging difficulty and the like of a decoupling method for adding discrete devices.

The technical scheme is as follows:

in one aspect, an antenna assembly is provided that includes a first antenna and a circuit structure;

the first antenna is arranged on a middle frame structure of the terminal equipment;

the circuit structure is arranged on the middle frame structure and is coupled with the first antenna, and the circuit structure is equivalent to a circuit comprising inductance and/or capacitance.

In some embodiments, the antenna assembly further comprises:

the second antenna is arranged on the middle frame structure of the terminal equipment;

the second antenna and the first antenna are separated by a gap.

In some embodiments, the middle frame structure has a first conductor portion and a third conductor portion; the first conductor part forms the first antenna, and the third conductor part is arranged in parallel with the first conductor part at intervals;

at least part of the third conductor portion is equivalent to the capacitance; and/or the number of the groups of groups,

at least part of the third conductor portion is equivalent to the inductance.

In some embodiments, the third conductor portion includes a first stub and a second stub;

the first branch is parallel to the first conductor part and is spaced from the first conductor part by a first set distance d; one end of the first branch is connected with one end of the second branch, and the other end of the second branch extends towards a direction away from the first conductor part and is grounded.

In some embodiments, the third conductor portion further comprises a third stub; the third branch is arranged on one side of the first branch, which is far away from the first conductor part, in parallel, and is separated from the first branch by a second set distance;

the second branch is electrically connected to the third branch and the end of the first branch.

In some embodiments, the middle frame structure further has a second conductor portion forming the second antenna; the first conductor part and the second conductor part are arranged at two sides of the fracture at end-to-end intervals, and the projection of the third conductor part on the surface close to the first conductor part or the second conductor part is close to the fracture.

In some embodiments, an end of the first conductor portion, which is far away from the break, is grounded, and a first feeding point is disposed on the first conductor portion, and the first feeding point is electrically connected with a first feeding structure;

the end part of the second conductor part far away from the fracture is grounded, a second feeding point is arranged on the second conductor part, and the second feeding point is electrically connected with a second feeding structure.

In some embodiments, at least one of the first conductor portion and the second conductor portion is further provided with a matching point, and the matching point is electrically connected with the matching module.

In some embodiments, the first conductor portion and the second conductor portion are grounded by being connected to the remainder of the center frame structure;

the third conductor part is of a cutting and molding structure.

In some embodiments, the first antenna operates in a low frequency band and the second antenna operates in a wifi2.4g band;

the value range of a first set distance d between the first branch and the first conductor part is 0.5-1mm; the value range of the length L1 of the first branch is 11.5-15.5mm; the value range of the length L2 of the second branch knot is 1.5-3.5mm; the equivalent value of the capacitor is in the range of 2.5-4.5pF; the equivalent value of the inductor is in the range of 0.6-1.8nH.

On the other hand, a terminal device is provided, and the terminal device comprises the antenna component and the middle frame structure.

The technical scheme provided by the utility model has the beneficial effects that at least:

according to the antenna assembly, the circuit structure is arranged on the middle frame structure, the circuit structure can be equivalent to a circuit comprising inductance and/or capacitance, the circuit structure can be respectively connected with the first antenna and the second antenna in a coupling way, the problems of coupling and matching when the two antennas are tightly designed are solved on the premise that the structures of the middle frame structure, the first antenna and the second antenna are not required to be changed, the isolation degree, the radiation efficiency and other radiation performances between the first antenna and the second antenna can be effectively improved, and the antenna assembly can be suitable for terminal equipment of the middle frame integrated antenna.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural diagram of an antenna assembly and a terminal device according to an embodiment of the present utility model;

fig. 2 is a schematic structural diagram of an antenna assembly according to another embodiment of the present utility model;

FIG. 3 is a schematic diagram of a circuit structure according to an embodiment of the present utility model;

fig. 4 is an equivalent circuit diagram of an antenna assembly according to an embodiment of the present utility model;

FIG. 5 is a schematic diagram of the dimensions of a circuit structure according to an embodiment of the present utility model;

fig. 6 is a test result of isolation of an antenna assembly according to an embodiment of the present utility model;

fig. 7 is a test result of S parameters of an antenna assembly according to an embodiment of the present utility model;

fig. 8 is an S-parameter test chart of an antenna decoupled by an LC filter circuit in the related art.

Reference numerals in the drawings are respectively expressed as:

01. a first antenna; 02. a second antenna; 03. a circuit structure; 04. a middle frame structure;

1. a first conductor portion; 11. a first feeding point; 12. a first feed structure; 13. matching points; 14. a matching structure;

2. a second conductor portion; 21. a second feeding point; 22. a second feed structure;

3. a third conductor portion; 301. a first equivalent capacitance; 302. equivalent inductance; 31. a first branch; 32. a second branch; 33. a third branch; 34. a fourth branch; 35. fifth branch;

4. breaking the seam; 401. and a second equivalent capacitance.

Detailed Description

Reference will now be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The implementations described in the following exemplary examples do not represent all implementations consistent with the utility model. Rather, they are merely examples of apparatus and methods consistent with aspects of the utility model as detailed in the accompanying claims.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in fig. 1 are merely for convenience in describing the present utility model and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.

Unless defined otherwise, all technical terms used in the embodiments of the present utility model have the same meaning as commonly understood by one of ordinary skill in the art.

In the related art, in order to solve the coupling problem between antennas and improve the isolation between antennas, discrete devices such as scattered capacitors and inductance devices are commonly adopted to construct an LC filter circuit, and the LC filter circuit is used for filtering out the current in a specific frequency band so as to achieve the purpose of improving the isolation. However, the bandwidth achieved by this approach is narrow and in some cases the decoupling effect is not significant. Meanwhile, adding an LC filter circuit means that the use of electronic components is more or less increased, resulting in an increase in the cost of the terminal device. In addition, the use of capacitive and inductive devices also increases losses.

If the isolation of the two antennas is improved by adopting a discrete device to construct the LC filter circuit, the resonance of the low-frequency antenna is shifted, referring to fig. 8, S1,1_1 in fig. 8 is an original curve, and S1,1_2 are test curves after the LC filter circuit is added. From the low frequency band (mark point 1 and mark point 2), the offset of resonance reaches about 300MHz, the offset of high frequency is more, in order to restore to the original waveform, the matching circuit needs to be further improved, and the design of the low frequency band can not be completely restored by modifying the matching.

Therefore, the utility model provides an antenna assembly, which solves the coupling problem when two antennas are tightly designed on the premise of not changing the radiation structure of the antennas, and can improve the isolation between two adjacent antennas to 25dB.

The technical scheme provided by the utility model is suitable for the electronic equipment adopting one or more of the following communication technologies: bluetooth (BT) communication technology, global positioning system (Global Positioning System, GPS) communication technology, wireless fidelity (Wireless Fidelity, wiFi) communication technology, global system for mobile communications (Global System Formobile Communications, GSM) communication technology, wideband code division multiple access (Wideband Code Division Multiple Access, WCDMA) communication technology, long term evolution (Long Term Evolution, LTE) communication technology, 5G communication technology, and other communication technologies in the future.

The electronic equipment in the embodiment of the utility model can be a mobile phone, a tablet personal computer, a notebook computer, an intelligent bracelet, an intelligent watch, an intelligent helmet, intelligent glasses and the like. The electronic device may also be a cellular telephone, a cordless telephone, a session initiation protocol (Session Initiation Protocol, SIP) phone, a wireless local loop (Wireless Local Loop, WLL) station, a personal digital assistant (Personal Digital Assistant, PDA), a handheld device with wireless communication capabilities, a computing device or other processing device connected to a wireless modem, an in-vehicle device, an electronic device in a 5G network or an electronic device in a future evolved public land mobile network (Public Land Mobile Network, PLMN), etc., as the embodiments of the present utility model are not limited in this respect.

For the purpose of making the objects, technical solutions and advantages of the present utility model more apparent, the embodiments of the present utility model will be described in further detail with reference to the accompanying drawings.

In one aspect, as shown in connection with fig. 1, the present embodiment provides an antenna assembly comprising a first antenna 01 and a circuit structure 03.

The first antenna 01 is arranged on a middle frame structure 04 of the terminal equipment; the circuit structure 03 is disposed on the middle frame structure 04, and the circuit structure 03 is coupled to the first antenna 01, and the circuit structure 03 is equivalent to a circuit including an inductance and/or a capacitance.

The antenna assembly of this embodiment arranges circuit structure 03 on middle frame structure 04, and circuit structure can be equivalent to including inductance and/or electric capacity's circuit, and this circuit structure 03 can be connected with first antenna 01 coupling, under the prerequisite that need not to change middle frame structure 04 and first antenna 01's structure, has solved the coupling problem or the impedance matching when antenna closely designs, has effectively promoted the isolation between the first antenna 01, improves antenna assembly's matching performance and radiant efficiency, can be applicable to the terminal equipment of middle frame integrated antenna.

In some possible implementations, the middle frame structure 04 is a metal integrally formed middle frame, which is a part with a specific integral structural feature formed by processing a piece of metal material (such as aluminum alloy) through technologies of CNC (Computer Numerical Control, numerical control machine tool processing), stamping forming and the like, and has an integral feature, namely, can serve as most of the appearance of a product, and also serves as an internal part fixing frame, so that the middle frame has the advantages of good appearance integrity, simplicity, attractiveness, few assembly procedures, free design and the like.

The antenna component of the embodiment forms equivalent capacitance and coupling inductance by utilizing the self conductive characteristic to realize decoupling, does not need to add additional capacitance and inductance devices, is beneficial to reducing the cost of the antenna component, reduces the loss of the antenna and overcomes the problem of resonance offset in the related technology.

The circuit structure 03 on the middle frame structure 04 of the terminal equipment is utilized, the structure of the antenna is not required to be changed, and the antenna is suitable for CNC antenna design of a pure-frame mobile phone and other antenna designs, such as LDS (Laser Direct structuring, laser direct forming) antenna, MDA antenna (Metal Device Antenna, in-mold injection and die casting), FPC (Flexible Printed Circuit board ) antenna and the like.

As shown in connection with fig. 1, in some embodiments, the antenna assembly further comprises: the second antenna 02 is arranged on the middle frame structure 04 of the terminal equipment; the second antenna 02 and the first antenna 01 are separated by a break 4.

The first antenna 01 and the second antenna 02 are adjacently arranged, and the isolation of the two antennas can be improved by using the equivalent circuit structure of the circuit structure 03 through the coupling connection of the circuit structure 03 and the first antenna 01.

Illustratively, the first antenna 01 and the second antenna 02 are each part of a metal integrally formed center. The partial structure is processed by machining and laser cutting processes to form the structure capable of radiating and receiving electromagnetic waves.

As shown in connection with fig. 2, 4, in some embodiments, the middle frame structure 04 has a first conductor portion 1 and a third conductor portion 3; the first conductor part 1 forms a first antenna 01, and the third conductor part 3 is arranged in parallel with the first conductor part 1 at a distance.

At least part of the third conductor part 3 is equivalent to a capacitor 301 and at least part of the third conductor part 3 is equivalent to an inductance.

Illustratively, a portion of the third conductor portion 3 spaced apart from the first conductor portion 1 is equivalent to the first equivalent capacitance 301, and a portion of the third conductor portion 3 parallel to the first conductor portion 1 is equivalent to the equivalent inductance 302.

In the circuit structure 03 of the present embodiment, at least a part of the third conductor portion 3 is spaced from the first conductor portion 1, so that a capacitance can be equivalently formed with the first conductor portion 1, at least a part of the third conductor portion 3 extends parallel to the first conductor portion 1, and an inductance can be equivalently formed due to the influence of the current in the first conductor portion 1, so that the circuit structure 03 is configured as an equivalent LC band-stop filter circuit, and a decoupling effect is achieved.

The antenna assembly of the embodiment can utilize the conductor structures (such as the first conductor part 1 and the third conductor part 3) to equivalently form various equivalent circuits, replace discrete devices in the related art, realize decoupling or impedance matching of the antenna assembly, realize the use of the discrete devices, reduce the cost, reduce the stacking difficulty of terminal equipment and the like.

In fig. 4, since the first conductor portion 1 and the second conductor portion 2 are spaced apart from each other along the break line 4, a second equivalent capacitance 401 is generated at the break line 4.

As shown in connection with fig. 2, 4, in some embodiments, the third conductor portion 3 includes a first stub 31 and a second stub 32; the first branch 31 is parallel to the first conductor part 1, and the first branch 31 is spaced from the first conductor part 1 by a first set distance d; one end of the first branch 31 is connected to one end of the second branch 32, and the other end of the second branch 32 extends in a direction away from the first conductor portion 1 and is grounded. Illustratively, the first branch 31 and the first conductor portion 1 are spaced apart from each other to form a first equivalent capacitance 301, and the first branch 31 and the second branch 32 are connected in series to form an equivalent inductance 302.

The first stub 31 in the third conductor portion 3 of the present embodiment is spaced parallel to the first conductor portion 1, so that the first equivalent capacitance 301 can be formed with the first conductor portion 1. The first branch 31 and the second branch 32 are connected in series to the ground, thereby forming an equivalent inductance 302.

In some possible implementations, the first set distance d depends on the required equivalent capacitance value of the first equivalent capacitance 301, and the first set distance d is inversely related to the equivalent capacitance value, i.e. the larger the required equivalent capacitance value, the smaller the first set distance d, the smaller the required equivalent capacitance value, and the larger the first set distance d.

In other possible implementations, the first set distance d is also related to the facing area of the first branch 31, and when the required equivalent capacitance value of the first equivalent capacitor 301 is fixed, the first set distance d is inversely proportional to the facing area, so that the shape of the first branch 31 and the first set distance d can be reasonably arranged according to the actual space situation in the terminal device.

As shown in connection with fig. 3, in some embodiments, the third conductor part 3 further comprises a third stub 33; the third branch 33 and the first branch 31 are arranged in parallel on one side of the first branch 31 far away from the first conductor part 1, and are spaced apart from the first branch 31 by a second set distance, and the second branch 32 is electrically connected to the ends of the first branch 31 and the third branch 33, so that the first branch 31, the second branch 32 and the third branch 33 are sequentially electrically connected to form a U-shaped conductive structure, and the first branch 31 and the third branch 33 are spaced apart from each other to form a first equivalent capacitor 301.

By reasonably arranging the first set distance and the opposite area of the first branch 31 and the third branch 33, the equivalent value of the first equivalent capacitor 301 can be adjusted, so that the adjustment of the circuit structure 03 is realized.

It can be appreciated that the third conductor portion 3 may further include a fourth branch 34, a fifth branch 35, and so on, where the first branch 31, the second branch 32, the third branch 33, the fourth branch 34, and the fifth branch 35 are sequentially connected in an S shape, so that a plurality of equivalent capacitances can be formed, and parameters of the equivalent inductance 302 can be adjusted.

As shown in connection with fig. 4, in some embodiments, the circuit structure 03 includes a first equivalent capacitance 301 and an equivalent inductance 302; the tail end of the first antenna 01 and the tail end of the second antenna 02 are respectively and electrically connected with one end of the first equivalent capacitor 301, the other end of the first equivalent capacitor 301 is electrically connected with one end of the equivalent inductor 302, and the other end of the equivalent inductor 302 is grounded.

Therefore, the circuit structure 03 of the embodiment utilizes the conductor itself or the relative coupling of the conductor in the middle frame structure 04 and the first conductor part 1 and the third conductor part 3 to form the first equivalent capacitor 301 and the equivalent inductor 302 equivalently, which is equivalent to connecting an LC band-stop filter circuit in parallel at the tail ends of the first antenna 01 and the second antenna 02, thereby realizing better decoupling performance compared with the related art.

As shown in connection with fig. 2, in some embodiments, the middle frame structure 04 also has a second conductor portion 2; the first conductor part 1 and the second conductor part 2 are arranged at two sides of the break joint 4 at end-to-end intervals, and the projection of the third conductor part 3 on the surface of the first conductor part 1 or the second conductor part 2 is close to the break joint 4; the first conductor part 1 forms a first antenna 01 and the second conductor part 2 forms a second antenna 02.

In this embodiment, the first antenna 01, the second antenna 02 and the circuit structure 03 are all formed by using the conductive material in the middle frame structure 04, and the antenna and the circuit structure 03 can be performed in the middle frame cutting process without adding additional steps.

Illustratively, the first conductor portion 1, the second conductor portion 2 and the third conductor portion 3 are respectively conductive regions in the middle frame structure 04, and resonance can be generated by external excitation, thereby realizing radiation and reception of electromagnetic waves.

For example, the middle frame structure 04 includes a side frame body, a break seam 4 is provided on the side frame body, the side frame bodies on two sides of the break seam 4 respectively form a first conductor portion 1 and a second conductor portion 2, and a conductor material on the inner side of the side frame body and close to the side frame body is used as a third conductor portion 3.

Another example is that the third conductor portions 3 are arranged on the side of the second conductor portion 2 at intervals in parallel, and that the projection of the third conductor portion 3 on the surface of the second conductor portion 2 is close to the break 4, wherein close is understood as the projection of the third conductor portion 3 on the surface of the second conductor portion 2 is in contact with the break 4, i.e. the situation shown in fig. 1. The third conductor portion 3 may be located above the second conductor portion 2, and a part of the third conductor portion 3 projected may be located in the break 4.

As shown in fig. 2, in some embodiments, an end of the first conductor portion 1, which is far away from the break 4, is grounded, and a first feeding point 11 is disposed on the first conductor portion 1, and the first feeding point 11 is electrically connected to the first feeding structure 12.

The end of the second conductor part 2 far away from the break joint 4 is grounded, a second feeding point 21 is arranged on the second conductor part 2, and the second feeding point 21 is electrically connected with a second feeding structure 22.

In this embodiment, the first conductor portion 1 is used as a radiator of the first antenna 01, and an end portion of the first conductor portion 1 is grounded, and the first feeding point 11 is electrically connected to the first feeding structure 12. The first feeding structure 12 transmits a radio frequency signal to the first conductor part 1 through the first feeding point 11, so as to excite the first conductor part 1 to generate resonance, thereby realizing signal radiation of a certain frequency band. The second conductor part 2 is used as a radiator of the second antenna 02, the end of the second conductor part 2 is grounded, and the second feeding point 21 is electrically connected to the second feeding structure 22. The second feeding structure 22 transmits a radio frequency signal to the second conductor part 2 through the second feeding point 21, so as to excite the second conductor part 2 to generate resonance, thereby realizing signal radiation of another frequency band.

As shown in connection with fig. 2, in some embodiments, at least one of the first conductor part 1 and the second conductor part 2 is further provided with a matching point 13, and the matching point 13 is electrically connected with the matching module. The matching module can be used for carrying out matching adjustment on the first antenna 01 or the second antenna 02, so that the resonance width of the first antenna 01 or the second antenna 02 is increased.

Illustratively, the matching module includes at least one switching element having one end electrically connected to the matching point 13 and the other end grounded.

As shown in connection with fig. 2, in some embodiments, the first conductor portion 1 and the second conductor portion 2 are grounded by being connected to the rest of the middle frame structure 04; the third conductor portion 3 is a cut-and-molded structure. Thus, the first conductor part 1, the second conductor part 2 and the third conductor part 3 can be performed during the cutting process of the middle frame without adding additional steps.

In some embodiments, as shown in connection with fig. 5, the first antenna 01 operates in the low frequency band and the second antenna 02 operates in the wifi2.4g band.

The circuit structure 03 in the embodiment presents a short-circuit open-circuit state when the antenna assembly works in the wifi2.4ghz frequency band, and presents a short-circuit state in the low-frequency band, so that the influence of coupling current brought by the secondary mode of the low-frequency antenna can be effectively isolated, and the isolation between antennas is improved.

The antenna assembly provided by the utility model has the best effect on the low-frequency long-frame antenna with the size larger than 50mm by arranging the circuit structure 03 at the tail end of the antenna radiation branch. Meanwhile, the influence of the circuit structure 03 on the low-frequency antenna is minimum because the current at the tail end of the antenna radiation branch is weaker, and the original matching of the low-frequency antenna is basically not changed.

Referring to fig. 5, in some embodiments, the first set distance d between the first stub 31 and the first conductor portion 1 is in the range of 0.5-1mm; the value range of the length L1 of the first branch 31 is 11.5-15.5mm; the length L2 of the second branch 32 has a value ranging from 1.5mm to 3.5mm; the equivalent value of the first equivalent capacitor 301 is in the range of 2.5-4.5pF; the equivalent value of the equivalent inductor 302 is in the range of 0.6-1.8nH.

When the antenna assembly of the present embodiment meets the above parameter ranges, referring to fig. 6, it can be seen that the isolation between the first antenna 01 and the second antenna 02 is increased from-7.6 dB to-31 dB, which improves the isolation by approximately 25dB, and as can be seen from the solid line mark in the figure, there is a concave point at the WiFi frequency point, which is realized by the circuit structure 03 of the present embodiment. Referring to fig. 8, it can be seen that when the low frequency antenna (the first antenna 01) covers the low frequency band, a higher order mode is generated to fall into the wifi2.4g band (resonance occurs at 2.45 GHz), and after the embodiment is adopted, the isolation is effectively improved.

Further, referring to fig. 6, wherein solid lines S1, 2_impulse correspond to the present embodiment, and broken lines S1,2_ori correspond to the related art. Referring to fig. 7, where solid lines S1,1 represent input matches, first dashed lines S2,2 represent output matches, second dashed lines S2,1 and third dashed lines S1,2 represent gains (S2, 1, S1,2 positions overlap in the figure).

Illustratively, the value of d in the first setting office of the first branch 31 and the first conductor portion 1 is, for example, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, or the like.

Illustratively, the length L1 of the first stub 31 has a value of, for example, 11.5mm, 12mm, 12.5mm, 13mm, 13.5mm, 14mm, 15mm, 15.5mm, and so forth. Alternatively, L1 has a value of 13.5mm.

Illustratively, the length L2 of the second stub 32 has a value of, for example, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, and so forth. Alternatively, the length L2 of the second stub 32 is 2.5mm.

Illustratively, the equivalent value of the first equivalent capacitance 301 is, for example, 2.5pF, 3pF, 3.5pF, 4pF, 4.5pF, etc. Alternatively, the equivalent value of the first equivalent capacitance 301 is 3.5pF.

Another exemplary value of the equivalent inductance 302 is, for example, 0.6nH, 0.8nH, 1nH, 1.2nH, 1.4nH, 1.6nH, 1.8nH, etc. Alternatively, the equivalent value of the equivalent inductance 302 is 1.2nH.

On the other hand, as shown in fig. 1, this embodiment provides a terminal device, where the terminal device includes the antenna assembly and the middle frame structure 04 of the present utility model.

The terminal equipment of the embodiment adopts the antenna assembly of the utility model, and has all the beneficial technical effects of all the embodiments.

It should be noted that references herein to "a number", "at least one" means one or more, and "a plurality", "at least two" means two or more. "and/or", describes an association relationship of an association object, and indicates that there may be three relationships, for example, a and/or B, and may indicate: a exists alone, A and B exist together, and B exists alone. The character "/" generally indicates that the context-dependent object is an "or" relationship.

The terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more features. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In the description of the present specification, reference to the terms "certain embodiments," "one embodiment," "some embodiments," "an exemplary embodiment," "an example," "a particular example," or "some examples" means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present utility model.

The foregoing description of the embodiments of the utility model is not intended to limit the utility model, but rather, the utility model is to be construed as limited to the embodiments disclosed.

Claims (11)

1. An antenna assembly, characterized in that the antenna assembly comprises a first antenna (01) and a circuit structure (03); the first antenna (01) is arranged on a middle frame structure (04) of the terminal equipment;

the circuit structure (03) is arranged on the middle frame structure (04), the circuit structure (03) is coupled with the first antenna (01), and the circuit structure (03) is equivalent to a circuit comprising inductance and/or capacitance.

2. The antenna assembly of claim 1, wherein the antenna assembly further comprises:

the second antenna (02) is arranged on the middle frame structure (04) of the terminal equipment;

the second antenna (02) and the first antenna (01) are separated by a fracture (4).

3. The antenna assembly according to claim 2, characterized in that the mid-frame structure (04) comprises a first conductor part (1) and a third conductor part (3); the first conductor part (1) forms the first antenna (01), and the third conductor part (3) is at least partially parallel to the first conductor part (1);

at least part of the third conductor part (3) is equivalent to the capacitance; and/or at least part of the third conductor portion (3) is equivalent to the inductance.

4. An antenna assembly according to claim 3, characterized in that the third conductor part (3) comprises a first branch (31) and a second branch (32);

the first branch (31) is parallel to the first conductor part (1) and is spaced from the first conductor part (1) by a first set distance d; one end of the first branch (31) is connected with one end of the second branch (32), and the other end of the second branch (32) extends towards a direction away from the first conductor part (1) and is grounded.

5. The antenna assembly according to claim 4, characterized in that the third conductor part (3) further comprises a third stub (33); the third branch (33) is arranged in parallel on one side of the first branch (31) far away from the first conductor part (1) and is separated from the first branch (31) by a second set distance;

the second branch (32) is electrically connected to the ends of the third branch (33) and the first branch (31).

6. An antenna assembly according to claim 3, characterized in that the middle frame structure (04) also has a second conductor part (2); the second conductor part (2) forms the second antenna (02);

the first conductor part (1) and the second conductor part (2) are arranged at two sides of the fracture (4) at end-to-end intervals, and the projection of the third conductor part (3) on the surface of the first conductor part (1) is close to the fracture (4).

7. The antenna assembly according to claim 6, characterized in that an end of the first conductor part (1) remote from the break (4) is grounded, a first feeding point (11) is provided on the first conductor part (1), the first feeding point (11) being electrically connected to a first feeding structure (12);

the end part of the second conductor part (2) far away from the fracture (4) is grounded, a second feeding point (21) is arranged on the second conductor part (2), and the second feeding point (21) is electrically connected with a second feeding structure (22).

8. The antenna assembly according to claim 7, characterized in that at least one of the first conductor part (1) and the second conductor part (2) is further provided with a matching point (13), the matching point (13) being electrically connected with a matching structure (14).

9. The antenna assembly according to claim 6, characterized in that the first conductor part (1) and the second conductor part (2) are grounded by being connected to the rest of the middle frame structure (04);

the third conductor part (3) is of a cutting and molding structure.

10. The antenna assembly according to claim 4, characterized in that the first antenna (01) operates in a low frequency band and the second antenna (02) operates in a wifi2.4g band;

the value range of a first set distance d between the first branch (31) and the first conductor part (1) is 0.5-1mm; the value range of the length L1 of the first branch knot (31) is 11.5-15.5mm; the value range of the length L2 of the second branch knot (32) is 1.5-3.5mm; the equivalent value of the capacitor is in the range of 2.5-4.5pF; the equivalent value of the capacitor is in the range of 0.6-1.8nH.

11. A terminal device, characterized in that it comprises an antenna assembly according to any one of claims 1 to 10, and a mid-frame structure (04).