CN102780065A - Antenna assembly and mobile terminal - Google Patents

Abstract

The present invention relates to an antenna assembly for a mobile terminal and a mobile terminal using such an antenna assembly. The basic idea of the invention is to utilize the conductive housing of the mobile terminal as the radiating element of its antenna system. In one embodiment of the present invention, an antenna assembly for a mobile terminal (20) is provided, which is characterized in that it includes: a radiation unit (206), which is integrated into the cover of the mobile terminal and is composed of a conductive Made of material; the radiating unit includes at least one antenna port (261, 262) formed thereon; wherein, when the cover is fastened to the mobile terminal, the antenna port can stimulate the radiating unit to work in multiple frequency bands. This design can reduce the number of independent antennas in the existing mobile terminal, and thus can further realize the miniaturization of the mobile terminal.

Description

Antenna assembly and mobile terminal

technical field

The present invention relates to an antenna technology, in particular to an antenna assembly for a mobile terminal.

Background technique

While its appearance is increasingly miniaturized and ultra-thin, the functions of mobile terminals are also becoming more and more complex, and it needs to meet multiple communication protocols and standards at the same time. On the one hand, these trends make the space occupied by antenna elements in mobile terminals smaller and smaller. On the other hand, the performance of antennas that only occupy a limited space is continuously put forward higher requirements, that is, antenna systems are required to operate in more frequency bands, Maintain high-performance working conditions over a wider frequency band. As a frequency-dependent component, the antenna's radiation performance is proportional to the size of the space it occupies. The small space will limit the radiation performance of the antenna, making it difficult to meet the performance requirements of the system.

A mobile terminal usually includes several antennas that are independent of each other. In particular, in mobile phone terminals, it is customary to divide these antennas into main antennas and auxiliary antennas according to their functions, where the main antenna is an antenna supporting the communication protocol of the cellular system, such as GSM, CDMA, WCDMA and so on. The auxiliary antenna can be an antenna that supports different frequency band signals such as GPS (Global Positioning System), Bluetooth, WLAN, mobile TV, or FM FM radio, or it can be an auxiliary antenna that supports multiple input multiple output (MIMO) technology or signal diversity technology. antenna. Since each antenna occupies a certain space inside the mobile terminal, the space occupied by the entire antenna system is extremely considerable. For each antenna element, due to the limitation of its area, height, clearance and other factors, as well as the influence of the housing and other components, it is difficult to achieve an excellent radiation performance, which will eventually affect the communication quality of the system.

In addition, in the field of mobile terminals, especially mobile phone terminals, metal shells are increasingly favored by consumers due to their texture and durability. It has become a trend to use metal materials as mobile phone casings. A conventional practice is to electrically connect the metal casing to the ground of the circuit board in the mobile terminal, making it a part of the system ground. In order to prevent the metal shell from shielding the signal of the built-in antenna, holes or slots are opened in the metal shell corresponding to the built-in antenna so that the signal of the antenna can radiate out. In this way, because an extra large metal part is added around the antenna, it usually has a relatively large adverse effect on the performance of the antenna.

Contents of the invention

The basic idea of the invention is to utilize the conductive housing of the mobile terminal as its antenna radiator. Through the design of its shape, the position of the feed port, and the excitation method, the conductive shell can be used as an antenna radiator to realize wireless communication in one or more frequency bands.

In the present invention, a structure similar to a microstrip patch antenna is formed between the metal casing and the ground in the mobile terminal.

The microstrip patch antenna is an antenna formed by pasting a conductive sheet on a dielectric substrate with a conductive grounding plate. It is fed at an appropriate position through a microstrip line or a coaxial cable, and is excited between the conductive sheet and the grounding plate. The radio frequency electromagnetic field is generated and radiated outward through the gap between the conductor sheet and the ground plate. The microstrip patch antenna has high radiation performance, is easy to conform to the shape, and the antenna form is flexible. It is easy to realize circular polarization, dual polarization, and multi-frequency work. Etc. However, due to the large space it occupies, microstrip patch antennas are rarely used in common mobile terminals.

Based on the above principles, a structure similar to a microstrip patch antenna is formed between the metal casing in the present invention and the floor of the printed circuit board in the mobile terminal. Its frequency band and mode can be realized by designing the shape of the housing, the position of the feed and the way of the feed. In existing designs, there is also a solution of integrating the antenna on the appearance of the mobile terminal, for example, using the metal frame of the mobile terminal as the antenna. However, the antennas used in these designs are traditional antenna forms in mobile terminals such as monopole antennas, loop antennas, or inverted F antennas (IFA), and the casings in these designs are all made of plastic, and only metal materials are embedded in the frame area. The radiating element of the antenna.

In one embodiment of the present invention, there is provided an antenna assembly for a mobile terminal, which is characterized by comprising: a radiation unit integrated into the cover of the mobile terminal and made of conductive material; the radiation unit The unit includes at least one antenna port formed thereon; wherein, when the cover is fastened to the mobile terminal, the antenna port can excite the radiation unit to work in multiple frequency bands.

In one embodiment of the present invention, the antenna assembly for a mobile terminal further includes a floor of a printed circuit board in the mobile terminal. The radiating element and the floor form a structure similar to a microstrip patch antenna.

In one embodiment of the present invention, the antenna assembly for a mobile terminal further includes at least one feed unit corresponding to the antenna ports one by one, and the feed unit and the antenna port are connected by contact or Contactless connection.

In one embodiment of the present invention, the plurality of operating frequency bands used for the antenna assembly of the mobile terminal includes any combination of frequency bands corresponding to the following communication protocols: GPS, Bluetooth, WiFi, FM radio, mobile TV, GSM, CDMA, WCDMA , TD-SCDMA, LTE, WiMAX.

In another embodiment of the present invention, in the antenna assembly for a mobile terminal, the antenna port on the radiating unit includes at least one multi-frequency antenna port, and the multi-frequency antenna port can excite the radiating unit to work on multiple antenna components of the antenna assembly. A subset of working frequency bands, the subset includes at least two frequency bands in the plurality of working frequency bands.

In another embodiment of the present invention, in the antenna assembly for a mobile terminal, the antenna port on the radiation unit includes a plurality of antenna ports; wherein, each of the plurality of antenna ports can stimulate the radiation unit to work in different frequency bands.

In one embodiment of the present invention, there is provided an antenna assembly for a mobile terminal, which is characterized by comprising: a radiation unit integrated into the cover of the mobile terminal and made of conductive material; the radiation unit The unit includes a plurality of antenna ports formed thereon; wherein, when the cover is fastened to the mobile terminal, the plurality of antenna ports can excite the radiation unit to work in the same frequency band.

In one embodiment of the present invention, the antenna assembly for a mobile terminal further includes a floor of a printed circuit board in the mobile terminal. The radiating element and the floor form a structure similar to a microstrip patch antenna.

In one embodiment of the present invention, the antenna assembly for a mobile terminal further includes a plurality of feeding units corresponding to the plurality of antenna ports one by one, and a contact method is adopted between the feeding unit and the antenna ports. connection or contactless connection.

In an embodiment of the present invention, at least two of the multiple antenna ports of the antenna assembly of the mobile terminal can excite the radiation unit to work in an orthogonal mode in the same frequency band.

In one embodiment of the present invention, the outer surface of the radiating unit of the antenna assembly used in the mobile terminal is covered with an electrical insulating layer, so as to further reduce the adverse effect on wireless communication performance caused by the user's contact with the radiating unit.

In one embodiment of the present invention, in the antenna assembly used in a mobile terminal, the conductive material used in the radiation unit includes metal, conductive plastic or conductive rubber.

In one embodiment of the present invention, a mobile terminal is provided, which includes the antenna assembly described in any one of the foregoing embodiments.

In one embodiment of the present invention, the mobile terminal further includes a gate unit (switch unit, duplexer or multiplexer) connected to the multi-frequency antenna port.

It can be seen from the examples given in the present invention that by exciting the housing at multiple different positions, the housing antenna can generate resonances covering multiple wireless communication frequency bands, and can obtain excellent radiation efficiency in each resonance frequency band , good isolation can be achieved between the antenna ports, and multi-protocol wireless communication can be performed simultaneously. Due to the large size of the metal case, it is easy to obtain higher free-space radiation efficiency by using the case as an antenna radiator. At the same time, this design can reduce the number of independent antennas in the existing mobile terminal, so the miniaturization of the mobile terminal can be further realized.

Description of drawings

Other characteristics, objects and advantages of the present invention will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings:

FIG. 1 shows an exploded structure diagram of a part of a mobile terminal according to an embodiment of the present invention;

Figure 2a shows an exploded view of a part of a mobile terminal according to another embodiment of the present invention;

Figure 2b shows a plan view of the radiation unit of the mobile terminal in Figure 2a;

Fig. 2c shows the return loss curves of each antenna port in the mobile terminal shown in Fig. 2a;

Fig. 2d shows the transmission coefficient curve of each antenna port in the mobile terminal shown in Fig. 2a;

Fig. 3 shows an exploded structure diagram of a part of a mobile terminal according to another embodiment of the present invention;

Fig. 4 shows a logical structural diagram of a part of a mobile terminal according to another embodiment of the present invention;

FIG. 5 shows an exploded structure diagram of a part of a mobile terminal according to another embodiment of the present invention;

Figure 6a shows a plan view of a radiation element in an antenna assembly according to another embodiment of the present invention;

Figure 6b shows return loss and transmission coefficient curves for the antenna port shown in Figure 6a;

In the figures, the same or similar reference numerals designate corresponding features throughout the different views.

Detailed ways

The mobile terminal referred to in the present invention covers any portable or handheld mobile device that can communicate with other devices through one or more wireless protocols or standards, such as but not limited to mobile phones, smart phones, personal digital assistants ( PDA), portable computer, portable GPS terminal, etc.

FIG. 1 shows an exploded structure diagram of a part of a mobile terminal 10 according to an embodiment of the present invention. As shown in the figure, the mobile terminal 10 in this embodiment includes a front panel 103 , a printed circuit board (PCB) 102 , a conductive back cover 101 , a non-conductive housing 104 , and an independent built-in antenna 105 . For example and without limitation, a battery may be at least partially disposed between the back cover 101 and the printed circuit board 102 .

A planar radiation unit is integrated on the rear cover 101 as a part of the antenna assembly. In some examples, the entire rear cover 101 can serve as a radiation unit. Typically, the radiating elements are constructed of conductive materials, such as metals, alloys, conductive plastics or conductive rubber.

A feed unit 151 and its corresponding signal processing module 111 , a feed unit 152 and its corresponding signal processing module 112 , a feed unit 153 and its corresponding signal processing module 113 are also arranged on the printed circuit board 102 . When the back cover 101 is fastened to the mobile terminal 10, each feeding unit 151, 152, 153 can feed power through a corresponding antenna port on the radiating unit, so as to excite the radiating unit to work in at least one frequency band. In this way, the radiation unit integrated in the rear cover 101 and the floor of the printed circuit board 102 form a structure similar to a microstrip patch antenna. In this example, the power feeding unit 151 corresponds to a mobile TV frequency band to support mobile multimedia services, the working frequency band corresponding to the power feeding unit 152 is the Bluetooth frequency band, and the working frequency band corresponding to the power feeding unit 153 is the GPS frequency band.

Based on some design considerations, the independent built-in antenna 105 is still necessary. In this case, a non-conductive casing 104 is used in a part of the mobile terminal 10 . The casing 104 is usually made of plastic material so that the independent built-in antenna 105 can effectively radiate wireless signals without being shielded.

In various embodiments of the present invention, the working frequency band corresponding to each feed unit (or antenna port) may include one or more of the frequency bands corresponding to the following communication protocols: GPS, Bluetooth, WiFi, FM radio, mobile TV UHF band, S band, GSM, CDMA, WCDMA, TD-SCDMA, LTE, WiMAX. In order for the signal to be effectively transmitted to the antenna port, the feed unit includes the necessary matching circuits.

Fig. 2a shows an exploded structure diagram of a part of a mobile terminal 20 according to another embodiment of the present invention. The mobile terminal 20 in this embodiment includes a printed circuit board 202 and a radiation unit 206 integrated on a cover (not shown).

The radiation unit 206 includes antenna ports 261 and 262 .

The printed circuit board 202 includes power feeding units 251, 252 and corresponding signal processing modules (not shown in the figure). A conventional antenna 208 is provided at one end of the printed circuit board 202 in an area not covered by the radiating element 206 . The antenna 208 is for example but not limited to a monopole antenna, a PIFA antenna.

The feeding unit 251 corresponds to the antenna port 261 , and feeds power to the antenna port 261 to excite the radiation unit 206 to work. The feeding unit 252 corresponds to the antenna port 262 , and feeds power to the antenna port 262 to excite the radiation unit 206 to work. In this way, the radiation unit 206 integrated in the cover and the floor of the printed circuit board 202 form a structure similar to a microstrip patch antenna.

Between the feeding unit 251 and the antenna port 261 , and between the feeding unit 252 and the antenna port 262 , contact connection or non-contact connection may be adopted. For contact connections, the feed unit can take the form of a pogo pin or a spring clip. For the non-contact connection, the feed unit and the corresponding antenna port adopt, for example but not limited to, capacitive coupling. In some other embodiments of the present invention, the feed unit can also be arranged on the cover.

Figure 2b shows a plan view of the radiation unit 206 of the mobile terminal 20 in Figure 2a; Figure 2c shows the return loss curves of each antenna or antenna port in the mobile terminal 20 shown in Figure 2a; Transmission coefficient curves of each antenna or antenna port in the mobile terminal 20 .

As shown in FIG. 2 b , the radiating unit 206 is rectangular, with a size of 45 mm (x-axis)×75 mm (y-axis). Taking the lower right corner of the radiation unit 206 shown in the figure as the coordinate origin, the coordinates of the center of the antenna port 261 are (43mm, 22mm), and the coordinates of the center of the antenna port 262 are (22.5mm, 57mm). The return loss (vs. frequency) curve of the antenna port 261 is shown by the circle marked curve in Fig. 2c, and the transmission coefficient (vs. frequency) curve is shown by the circle marked curve in Fig. 2d. The return loss curve of the antenna port 262 is shown by the triangle marked curve in Fig. 2c, and the transmission coefficient curve is shown by the triangle marked curve in Fig. 2d. The return loss curve and the transmission coefficient curve of the antenna 208 are respectively shown by the unmarked curves in Fig. 2c and Fig. 2d. As shown in the figure, the working frequency band corresponding to the antenna port 261 includes the Bluetooth frequency band or WiFi frequency band near 2450MHz; the working frequency band corresponding to the antenna port 262 includes the GPS frequency band near 1575.42MHz; Frequency bands, such as GSM850MHz frequency band, EGSM900MHz frequency band, DCS1800MHz frequency band, PCS1900MHz frequency band, WCDMA frequency band (1710-1755MHz/2110-2155MHz/1920-1980MHz/2110-2170MHz). It can be seen from Figure 2c that in the above frequency bands, the corresponding return loss is below -6dB. It can be seen from Figure 2d that the isolation between each port is better than 15dB, indicating that this design scheme has excellent and reliable operation performance.

In order to avoid or reduce the adverse effect on the performance of the mobile terminal 20 caused by the user's body contacting the radiation unit 206 , optionally, an electrical insulation layer may also be covered on the outer surface of the radiation unit 206 .

In some other embodiments of the present invention, as a part of the antenna assembly, the radiating unit integrated into the cover of the mobile terminal has various shapes, such as triangle, quadrilateral, circle, ellipse, etc., and a polygon-like shape with rounded corners. . In some other embodiments, there are hollow parts of various shapes or patterns on the radiating unit integrated in the cover of the mobile terminal. Generally, these hollow parts are made of or filled with non-conductive materials. The above-mentioned various designs of the shape of the radiating element are used to meet the requirements for various working frequency bands and combinations thereof of the antenna.

FIG. 3 shows an exploded structure diagram of a part of a mobile terminal 30 according to yet another embodiment of the present invention. As shown in the figure, the mobile terminal 30 in this embodiment includes a front panel 303 , a printed circuit board 302 , and a rear cover 301 . For example and without limitation, a battery may be at least partially disposed between the back cover 301 and the printed circuit board 302 .

In this embodiment, the main body of the rear cover 301 serves as a radiation unit, and forms a structure similar to a microstrip patch antenna together with the floor of the printed circuit board 302 . In order to make the antenna have multiple resonant frequencies to support multiple operating frequency bands, the radiating unit can be designed with complex patterns, such as but not limited to a long strip and an E-shaped hollow part as shown in the figure .

The printed circuit board 302 is provided with a feed unit 351 and its corresponding signal processing module or circuit 311 . For example but not limited to, when the rear cover 301 is fastened to the mobile terminal 30, the feed unit 351 feeds power to the corresponding antenna port on the rear cover 301, and the antenna 301 can work in multiple cellular system frequency bands. Of course, other antenna ports and feeding units can also be added, so that the cover can work in frequency bands of other communication protocols at the same time, thereby replacing all independent antenna elements in the mobile terminal, and all antenna functions are realized by the cover.

In some embodiments of the present invention, the radiation unit integrated in the cover of the mobile terminal includes a plurality of antenna ports. The plurality of antenna ports includes at least one multi-frequency antenna port. The multi-frequency antenna port can excite the radiating unit to work in at least two frequency bands, and the at least two frequency bands are a subset of all the plurality of working frequency bands of the radiating unit. In one embodiment, the working frequency bands corresponding to the multi-frequency antenna port include: GPS frequency band, mobile TV UHF frequency band, WiFi, and Bluetooth frequency band. In this embodiment, the mobile terminal also includes a multiplexer connected to the multi-mode antenna port, the multiplexer is connected to one or more signal processing modules to process GPS signals, mobile TV signals, WiFi signals, bluetooth signal.

Fig. 4 shows a logical structure diagram of a part of a mobile terminal according to an embodiment of the present invention. In this embodiment, the radiation unit integrated on the cover of the mobile terminal includes a multi-frequency antenna port 451 . The multi-frequency antenna port 451 is connected to the feed unit 411 on the printed circuit board. As mentioned above, the connection method can be direct contact or non-contact coupling. The feeding unit 411 is connected to a gating unit 460 . The gating unit 460 is connected to a plurality of signal processing modules or circuits 461, 462, and so on. The multi-frequency antenna port 451 can excite the radiating unit to work in multiple frequency bands, and each signal processing module or circuit 461, 462 is used to process a signal of one of the working frequency bands. Specifically, the gating unit 460 includes a filtering unit corresponding to each signal processing circuit or module 461 , 462 to select the signal of the corresponding working frequency of each signal processing module or circuit. In different embodiments, according to actual application and design requirements, the gating units may be switch units, duplexers or multiplexers, respectively.

In other embodiments of the present invention, the radiation unit integrated in the cover of the mobile terminal includes multiple single-frequency antenna ports. The multiple single-frequency antenna ports can respectively excite the radiation unit to work in different frequency bands. In one embodiment, four single-frequency antenna ports are included on the radiating unit integrated in the cover of the mobile terminal; the working frequency band corresponding to one port is the GPS frequency band, and is connected to the GPS signal processing module on the printed circuit board; the other port The corresponding working frequency band is the Bluetooth frequency band, which is connected to the Bluetooth signal processing module on the printed circuit board; the corresponding working frequency band of the other port is the FM radio frequency band, which is connected to the FM broadcast signal processing module on the printed circuit board; the other port corresponds to the The working frequency band is the WiFi frequency band, and is connected to the WiFi signal processing module on the printed circuit board.

In some other embodiments of the present invention, the radiation unit integrated in the cover of the mobile terminal includes multiple single-frequency antenna ports, and the working frequency bands corresponding to the multiple ports are the same frequency band.

FIG. 5 shows an exploded structure diagram of a part of a mobile terminal 50 according to another embodiment of the present invention. The mobile terminal 50 in this embodiment includes a printed circuit board 502 and a radiation unit 506 integrated on a cover (not shown). The radiating element 506 and the floor of the printed circuit board 502 form a structure similar to a microstrip patch antenna.

The radiation unit 506 includes a first antenna port 561 and a second antenna port 562 formed thereon. The printed circuit board 502 includes feeding units 551 and 552 respectively connected to the first antenna port 561 and the second antenna port 562 and corresponding signal processing modules (not shown in the figure).

Both the first antenna port 561 and the second antenna port 562 can excite the radiation unit 506 to work in a first frequency band. The first frequency band may be a frequency band used by any wireless communication protocol supporting Multiple-Input, Multiple-Output, MIMO technology, such as but not limited to 2400-2483MHz WiFi frequency band.

Through carefully designing the shape and size of the radiation unit 506 and the positions of the first antenna port 561 and the second antenna port 562, the radiation unit 506 can be excited to generate two orthogonal modes with the same resonant frequency. For example but not limited to, the radiating unit 506 may be square or approximately square; the first antenna port 561 and the second antenna port 562 may be respectively located on the two central axes of the radiating unit 506 near the edges.

In one embodiment of the present invention, the antenna assembly for a mobile terminal includes a radiation unit integrated into the cover of the mobile terminal and made of conductive material; when the cover is fastened to the mobile terminal, The radiation unit and the floor of the printed circuit board in the mobile terminal form a structure similar to a microstrip patch antenna, and the distance between the radiation unit and the printed circuit board is 5mm. Fig. 6a specifically shows a plan view of the radiation unit 606 in the antenna assembly of this embodiment. As shown in the figure, the radiation unit 606 has a size of 55mm×54mm, and includes a first antenna port 661 and a second antenna port 662 thereon. Taking the lower left corner of the radiating unit 606 as the coordinate origin, the coordinates of the center of the antenna port 661 are (27.5mm, 14mm), and the coordinates of the center of the antenna port 662 are (19mm, 29mm). In this case, the mode excited by the antenna port 661 approximates the TM ₀₁ mode polarized along the y direction of the microstrip patch antenna, and the mode excited by the antenna port 662 is the TM ₁₀ mode polarized along the x direction. The modes are mutually orthogonal. Fig. 6b shows the performance curve of the antenna port shown in Fig. 6a. The return loss |S ₁₁ | curve for antenna port 661 is shown by the curve marked with a triangle, and the return loss |S ₁₁ | The transmission coefficient |S ₂₁ | curve is shown by the unlabeled curve. As shown in the figure, within the frequency band range (2400-2483MHz) of the wireless LAN, the in-band return losses of the antenna ports 661 and 662 are both less than -6dB, and the mutual isolation is higher than 20dB, and their good performance can meet The MIMO system requires high isolation and high efficiency of the multi-antenna system.

Those skilled in the art should understand that the above-mentioned embodiments are illustrative rather than restrictive. Different technical features in different embodiments can be combined to achieve beneficial effects. Those skilled in the art should be able to understand and implement other modified embodiments of the disclosed embodiments on the basis of studying the drawings, specification and claims. In the claims, the term "comprising" does not exclude other means or steps; the indefinite article "a" does not exclude a plurality; the terms "first" and "second" are used to indicate names rather than to indicate any specific Order. Any reference signs in the claims should not be construed as limiting the scope. The functions of multiple parts appearing in the claims can be realized by a single hardware or software module, and the functions of a certain part can also be realized by multiple different hardware or software modules. The appearance of certain technical features in different dependent claims does not mean that these technical features cannot be combined to obtain beneficial effects.

Claims (17)

1. An antenna assembly for a mobile terminal (20), characterized in that it comprises: a radiation unit (206), integrated into the cover of the mobile terminal and made of conductive material; The radiating element includes at least one antenna port (261, 262) formed thereon; Wherein, when the cover is fastened to the mobile terminal, the antenna port can excite the radiation unit to work in multiple frequency bands. 2. The antenna assembly according to claim 1, further comprising a floor of a printed circuit board in the mobile terminal. 3. The antenna assembly according to claim 2, further comprising at least one feeding unit (251, 252) corresponding to the antenna ports one-to-one, between the feeding unit and the antenna port Use contact connection or non-contact connection. 4. The antenna assembly according to claim 1, wherein the multiple frequency bands include any combination of frequency bands corresponding to the following communication protocols: GPS, Bluetooth, WiFi, FM radio, mobile TV, GSM, CDMA, WCDMA , TD-SCDMA, LTE, WiMAX. 5. The antenna assembly according to claim 1, wherein the outer surface of the radiating element is further covered with an electrical insulation layer. 6. The antenna assembly according to claim 1, wherein the conductive material comprises metal, conductive plastic or conductive rubber. 7. The antenna assembly according to claim 1, wherein the antenna port includes at least one multi-frequency antenna port, and the multi-frequency antenna port can excite the radiation unit to work in a subset of the plurality of frequency bands , the subset includes at least two frequency bands in the plurality of frequency bands. 8. The antenna assembly of claim 1, wherein the radiating element comprises a plurality of antenna ports formed thereon; Wherein, each of the plurality of antenna ports can stimulate the radiation unit to work in different frequency bands. 9. A mobile terminal, comprising the antenna assembly according to any one of claims 1 to 8. 10. A mobile terminal, characterized by comprising the antenna assembly according to claim 7, and further comprising a gate unit connected to the port of the multi-frequency antenna. 11. An antenna assembly for a mobile terminal, comprising: a radiation unit integrated into the cover of the mobile terminal and made of conductive material; The radiation unit includes a plurality of antenna ports formed thereon; Wherein, when the cover is fastened to the mobile terminal, at least two of the plurality of antenna ports can excite the radiation unit to work in the same frequency band. 12. The antenna assembly of claim 11, further comprising a floor of a printed circuit board in the mobile terminal. 13. The antenna assembly according to claim 12, further comprising a plurality of feeding units corresponding to the plurality of antenna ports one by one, the feeding unit and the antenna ports are connected by contact connection or contactless connection. 14. The antenna assembly according to claim 11, wherein the outer surface of the radiating element is further covered with an electrical insulating layer. 15. The antenna assembly according to claim 11, wherein the conductive material comprises metal, conductive plastic or conductive rubber. 16. The antenna assembly according to claim 11, wherein at least two of the plurality of antenna ports can excite the radiating element to work in an orthogonal mode in the same frequency band. 17. A mobile terminal, comprising the antenna assembly according to any one of claims 11-16.

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