TWI607600B - Antenna assembly and mobile terminal - Google Patents

Description

Antenna assembly and mobile terminal

The present invention relates to an antenna technology, and more particularly to an antenna assembly for a mobile terminal.

While the mobile terminal is increasingly becoming smaller and thinner, its functions are becoming more complex, requiring multiple communication protocols and standards to be met simultaneously. 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 occupying only a limited space is constantly demanding higher requirements, that is, the antenna system is required to be more Maintain high performance in the frequency band and wider frequency band. The antenna, as a frequency-dependent component, has a radiation performance proportional to the amount of 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.

Mobile terminals typically include several antennas that are independent of each other. In particular, in a mobile terminal, it is customary to divide the antennas into main antennas and auxiliary antennas according to functions, wherein the main antennas are antennas supporting communication protocols (such as GSM, CDMA, WCDMA, etc.) of the cellular system. The auxiliary antenna can be an antenna supporting signals in different frequency bands such as GPS (Global Positioning System), Bluetooth, wireless area network WLAN, mobile TV, or FM radio broadcast, or support multiple input multiple output (MIMO) technology or signal diversity technology. The secondary 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 its area, height, clearance and other factors, as well as the housing, etc. The influence of components makes it difficult to achieve excellent levels of radiation performance, which ultimately affects the communication quality of the system.

In addition, in the field of mobile terminals, especially mobile phone terminals, metal casings are increasingly favored by consumers due to their texture and durability. The use of metal as the casing of the mobile phone has become a trend. It is conventional practice to electrically connect the metal casing to the bottom plate of the circuit board in the mobile terminal to make it part of the system's backplane. In order to prevent the metal casing from shielding the signal of the built-in antenna, a hole or a slot is formed in a portion of the metal casing corresponding to the built-in antenna to enable the antenna signal to radiate outward. This approach typically results in a relatively large adverse effect on the performance of the antenna due to the addition of a larger metal component around the antenna.

The basic idea of the invention is to use the electrically conductive outer casing of the mobile terminal as its antenna radiator. Through its design of the shape and the feeding position and the excitation mode, the conductive housing 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 bottom plate in the mobile terminal.

The microstrip patch antenna is an antenna formed by affixing a conductor sheet on a dielectric substrate with a conductor connection substrate, and is fed between a conductor strip and a ground plate by feeding a microstrip line or a coaxial cable at an appropriate position. The radio frequency electromagnetic field is radiated outward by the gap between the periphery of the conductor sheet and the grounding plate. The microstrip patch antenna has high radiation performance, is easy to conform, and has flexible antenna form, and is easy to realize circular polarization, dual polarization, multi-frequency. The advantages of operation and so on. But because of it The space used is large, and microstrip patch antennas are rarely used in usual mobile terminals.

Based on the above principle, a structure similar to a microstrip patch antenna is formed between the metal casing of the present invention and the bottom plate of the printed circuit board in the mobile terminal. The frequency band and mode can be realized by designing the shape of the outer casing, the feeding position and the feeding mode. In the existing design, there is also a solution for integrating the antenna on the appearance of the mobile terminal, such as using a part of the metal frame of the mobile terminal as an antenna. However, the antennas used in these designs are in the form of conventional antennas 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 material, and only metal is embedded in the frame area. The material acts as a radiating element for the antenna.

In an embodiment of the present invention, an antenna assembly for a mobile terminal is provided, characterized in that the antenna assembly comprises: a radiating unit integrated in a cover of the mobile terminal and composed of a conductive material; The unit includes at least one antenna 形成 formed thereon; wherein, when the cover is fastened to the mobile terminal, the antenna 埠 can excite the radiating unit to operate in a plurality of frequency bands.

In an embodiment of the invention, the antenna assembly for a mobile terminal also includes a backplane of a printed circuit board in the mobile terminal. The radiating element and the bottom plate form a structure similar to a microstrip patch antenna.

In an embodiment of the present invention, the antenna assembly for the mobile terminal also includes at least one feeding unit corresponding to the antenna 埠, and the contact unit or the antenna 埠 is contact-connected or non-contact. connection.

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

In another embodiment of the present invention, in an antenna assembly for a mobile terminal, the antenna 上 on the radiating unit includes at least one multi-frequency antenna 埠, and the multi-frequency antenna 埠 can excite the radiating unit to operate in the antenna assembly. A subset of a plurality of operational frequency bands, the subset comprising at least two of the plurality of operational frequency bands.

In another embodiment of the present invention, in an antenna assembly for a mobile terminal, the antenna 上 on the radiating unit includes a plurality of antenna 埠; wherein each of the plurality of antenna 能够 is capable of exciting the radiating unit to operate Different frequency bands.

In an embodiment of the present invention, an antenna assembly for a mobile terminal is provided, characterized in that the antenna assembly comprises: a radiating unit integrated in a cover of the mobile terminal and composed of a conductive material; The unit includes a plurality of antennas formed thereon; wherein, when the cover is fastened to the mobile terminal, the plurality of antennas can excite the radiating elements to operate in the same frequency band.

In an embodiment of the invention, the antenna assembly for a mobile terminal also includes a backplane of a printed circuit board in the mobile terminal. The radiating element and the bottom plate form a structure similar to a microstrip patch antenna.

In an embodiment of the present invention, an antenna assembly for a mobile terminal device also includes a plurality of feed units corresponding to a plurality of antennas in one-to-one correspondence, and a contact connection or a non-contact between the feed unit and the antenna unit Contact connection.

In an embodiment of the invention, at least two of the plurality of antennas of the antenna assembly of the mobile terminal can excite the radiating elements to operate in an orthogonal mode of the same frequency band.

In an embodiment of the invention, the outer surface of the radiating element of the antenna assembly for the mobile terminal is also covered with an electrically insulating layer to further reduce the adverse effects of the user's contact with the radiating element on wireless communication performance.

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

In an embodiment of the invention, a mobile terminal is provided, comprising the antenna assembly of any of the preceding embodiments.

In an embodiment of the invention, the mobile terminal also includes a gating unit (switch unit, duplexer or multiplexer) connected to the multi-frequency antenna.

As can be seen from the embodiments of the present invention, by exciting the housing at a plurality of different locations, the housing antenna can generate resonances that cover multiple wireless communication bands, and excellent radiation can be obtained in each of the resonant frequency bands. Efficiency, good isolation between antennas can be achieved, and multi-protocol wireless communication can be performed at the same time. Due to the large size of the metal casing, it is easy to obtain a high free-space radiation efficiency by using the casing as an antenna radiator. At the same time, this design can reduce the number of independent antennas in the existing mobile terminal, so that the miniaturization of the mobile terminal can be further realized.

Other features, objects, and advantages of the present invention will become apparent from the Detailed Description of Description

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

1 shows an exploded structural view of a portion of a mobile terminal 10 in accordance with an embodiment of the present invention. As shown, 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 outer casing 104, and a separate internal antenna 105. For example, but not limited to, a battery can be disposed at least partially between the back cover 101 and the printed circuit board 102.

A one-sided radiating element is integrated on the back cover 101 as part of the antenna assembly. In some instances, the entire back cover 101 can function as a radiating element. Typically, the radiating element is constructed of a conductive material such as a metal, an alloy, a conductive plastic or a conductive rubber.

The feeding circuit board 102 is also provided with a feeding unit 151 and its corresponding signal processing module 111, a feeding unit 152 and its corresponding signal processing module 112, a feeding unit 153 and its corresponding signal processing module 113. . When the rear cover 101 is fastened to the mobile terminal 10, each of the feeding units 151, 152, 153 can be fed by a corresponding antenna 上 on the radiating unit to activate the radiating unit to operate in at least one frequency band. In this manner, the radiating elements integrated in the back cover 101 and the bottom plate of the printed circuit board 102 form a structure similar to a microstrip patch antenna. In this example, the feeding unit 151 corresponds to the mobile TV frequency band to support the mobile multimedia service, the operating frequency band corresponding to the feeding unit 152 is the Bluetooth frequency band, and the operating frequency band corresponding to the feeding unit 153 is the GPS frequency band.

Independent built-in antenna 105 still has its necessity based on certain design considerations. In this case, a portion of the mobile terminal 10 is a non-conductive outer casing 104. The outer casing 104 is usually of a plastic material for independent built-in The antenna 105 effectively radiates the wireless signal outward and is not shielded.

In various embodiments of the present invention, the operating frequency band corresponding to each feeding unit (or antenna 埠) 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 efficiently transmitted to the antenna, the feed unit includes the necessary matching circuitry.

2a shows an exploded structural view of a portion of a mobile terminal 20 in accordance with another embodiment of the present invention. The mobile terminal 20 in this embodiment includes a printed circuit board 202 and a radiating unit 206 integrated in a cover (not shown).

The antennas 261 and 262 are included on the radiating element 206.

The printed circuit board 202 includes feed units 251, 252 and corresponding signal processing modules (not shown). A conventional antenna 208 is disposed at one end of the printed circuit board 202, which is not covered by the radiating element 206. Antenna 208 is, for example but not limited to, a monopole antenna, a PIFA antenna.

The feed unit 251 corresponds to the antenna 埠261, and is energized by the antenna 261 to operate the excitation radiating unit 206. Feed unit 252 corresponds to antenna 262, and is energized by antenna 262 to energize radiating element 206. In this manner, the radiating elements 206 integrated in the cover and the bottom plate of the printed circuit board 202 form a structure similar to a microstrip patch antenna.

A contact connection or a contactless connection may be adopted between the feed unit 251 and the antenna 261, and between the feed unit 252 and the antenna 262. For contact connections, the feed unit can be in the form of a pogo pin or a collet. For non-contact connections, the feed unit is taken between the corresponding antenna In the form of, for example, but not limited to, capacitive coupling. In other embodiments of the invention, the feed unit may also be disposed on the cover.

Figure 2b shows a plan view of the radiating element 206 of the mobile terminal 20 of Figure 2a; Figure 2c shows the return loss curve of each antenna or antenna in the mobile terminal 20 shown in Figure 2a; Figure 2d shows the action shown in Figure 2a The transmission coefficient curve of each antenna or antenna in the terminal 20.

As shown in Figure 2b, the radiating element 206 is rectangular and has a size of 45 mm (x-axis) x 75 mm (y-axis). Taking the lower right corner of the radiating element 206 as shown in the figure as the coordinate origin, the coordinates of the center position of the antenna 埠 261 are (43 mm, 22 mm), and the coordinates of the center position of the antenna 埠 262 are (22.5 mm, 57 mm). The return loss (to frequency) curve of antenna 埠 261 is shown by the curve of the circular mark in Figure 2c, and the curve of the transmission coefficient (for frequency) is shown by the curve of the circular mark in Figure 2d. The return loss curve of the antenna 埠 262 is shown by the curve of the triangle mark in Fig. 2c, and the transmission coefficient curve is shown by the curve of the triangle mark in Fig. 2d. The return loss curve and the transmission coefficient curve of the antenna 208 are respectively shown by the unmarked curves in Figs. 2c and 2d. As shown in the figure, the operating band corresponding to the antenna 埠 261 includes a Bluetooth band or a WiFi band near 2450 MHz; the operating band corresponding to the antenna 262 includes a GPS band near 1575.42 MHz; and the operating band corresponding to the conventional antenna 208 includes a plurality of cellular types. System bands, such as the GSM850 MHz band, the EGSM900 MHz band, the DCS1800 MHz band, the PCS1900 MHz band, and the WCDMA band (1710-1755 MHz/2110-2155 MHz/1920-1980 MHz/2110-2170 MHz). As can be seen from Figure 2c, in these bands, the corresponding return loss is below -6dB. As can be seen from Figure 2d, the isolation between the turns Better than 15dB, this design has excellent and reliable operation performance.

In order to avoid or reduce the user's limb contact with the radiating element 206, the performance of the mobile terminal 20 is adversely affected. Optionally, an outer insulating surface of the radiating element 206 may be covered with an electrically insulating layer.

In some other embodiments of the present invention, as part of the antenna assembly, the radiating elements integrated into the cover of the mobile terminal have various shapes, such as a triangle, a quadrangle, a circle, an ellipse, etc., and the corners are smooth. Class polygon. In other embodiments, there are hollowed out portions of various shapes or patterns on the radiating elements integrated into the cover of the mobile terminal. Typically, such hollowed portions are constructed or filled with a non-conductive material. The various designs described above for the shape of the radiating element are used to meet the requirements for various operating frequency bands of the antenna and combinations thereof.

3 shows an exploded structural view of a portion of a mobile terminal device 30 in accordance with yet another embodiment of the present invention. As shown, the mobile terminal 30 in this embodiment includes a front panel 303, a printed circuit board 302, and a rear cover 301. For example, but not limited to, a battery can 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 functions as a radiating unit and forms a structure similar to the microstrip patch antenna together with the bottom plate of the printed circuit board 302. In order to make the antenna have multiple resonant frequencies to support multiple operating frequency bands, the radiating element can be designed to have a complex pattern shape, such as, but not limited to, having a long strip shape and an E-shaped hollow as shown. section.

A feeding unit 351 and its corresponding signal processing module or circuit 311 are disposed on the printed circuit board 302. For example (but not limited to), when the back cover 301 is fastened to the line When the terminal 30 is powered, the corresponding antenna 上 on the rear cover 301 is fed by the feeding unit 351, and the antenna 301 can operate in a plurality of cellular system frequency bands. Of course, other antennas and feed units can be added so that the cover can operate in the frequency band of other communication protocols at the same time, thereby replacing all the independent antenna elements in the mobile terminal, and all antenna functions are realized by the cover.

In some embodiments of the invention, a plurality of antennas are included on a radiating element integrated into the cover of the mobile terminal. At least one multi-frequency antenna 埠 is included in the plurality of antennas. The multi-frequency antenna 埠 is capable of exciting the radiating element to operate in at least two frequency bands, the at least two frequency bands being a subset of all of the plurality of operating frequency bands of the radiating element. In an embodiment, the operating frequency bands corresponding to the multi-frequency antenna 包括 include: a GPS frequency band, a mobile TV UHF frequency band, a WiFi, and a Bluetooth frequency band. In this embodiment, the mobile terminal device also includes a multiplexer connected to the multimode antenna ,, and the multiplexer is connected to one or more signal processing modules to respectively process the GPS signal, the mobile TV signal, the WiFi signal, and the blue Bud signal.

4 shows a logical block diagram of a portion of a mobile terminal in accordance with an embodiment of the present invention. In this embodiment, the radiating unit integrated on the cover of the mobile terminal includes a multi-frequency antenna 451. The multi-frequency antenna 埠 451 is connected to a feed unit 411 on a printed circuit board. As mentioned before, the connection method can be either direct contact or non-contact coupling. The feed unit 411 is connected to a gate unit 460. The gating unit 460 is coupled to a plurality of signal processing modules or circuits 461, 462, and the like. The multi-frequency antenna 451 can excite the radiating element to operate in a plurality of frequency bands, and each of the signal processing modules or circuits 461, 462 is configured to process signals in one of the operating frequency bands. Specifically, the gating unit 460 includes a filtering unit corresponding to each signal processing circuit or module 461, 462, to select one by one. Select the signal of the operating frequency corresponding to each signal processing module or circuit. In different embodiments, the gating unit may be a switching unit, a duplexer, or a multiplexer, respectively, depending on actual application and design requirements.

In still other embodiments of the present invention, the radiating unit integrated in the cover of the mobile terminal includes a plurality of single-frequency antennas. The plurality of single-frequency antennas can respectively excite the radiating elements to operate in different frequency bands. In one embodiment, the radiating unit integrated in the cover of the mobile terminal includes four single-frequency antennas; one of the corresponding operating frequency bands is a GPS frequency band, and is connected to a GPS signal processing module on the printed circuit board; The other corresponding operating frequency band is the Bluetooth frequency band, which is connected to the Bluetooth signal processing module on the printed circuit board; the other corresponding operating frequency band is the FM broadcasting frequency band, which is connected to the FM broadcasting signal processing module on the printed circuit board. The other operating frequency band is the WiFi band, which is connected to the WiFi signal processing module on the printed circuit board.

In other embodiments of the present invention, the radiating unit integrated in the cover of the mobile terminal includes a plurality of single-frequency antennas, and the operating frequency bands corresponding to the plurality of ports are the same frequency band.

FIG. 5 shows an exploded structural view of a portion of a mobile terminal device 50 in accordance with another embodiment of the present invention. The mobile terminal 50 of this embodiment includes a printed circuit board 502 and a radiating element 506 integrated into a cover (not shown). The radiating element 506 and the bottom plate of the printed circuit board 502 form a structure similar to a microstrip patch antenna.

The radiating unit 506 includes a first antenna 561 and a second antenna 562 formed thereon. The printed circuit board 502 includes feeding units 551 and 552 connected to the first antenna 561 and the second antenna 562, respectively, and corresponding letters. Number processing module (not shown).

Both the first antenna 561 and the second antenna 562 are capable of exciting the radiating unit 506 to operate in a first frequency band. The first frequency band can be a frequency band used by any wireless communication protocol supporting multiple input multiple output technology, such as, but not limited to, the 2400 MHz to 2583 MHz WiFi frequency band.

By carefully designing the shape and size of the radiating element 506 and the positions of the first antenna 埠 561 and the second antenna 埠 562, the radiating unit 506 can be excited to generate two orthogonal modes, and the resonance of the two modes The frequency is the same. For example, but not limited to, the radiating element 506 can be square or approximately square; the first antenna 埠 561 and the second antenna 埠 562 can be located on the two central axes of the radiating element 506, respectively, near the edge.

In an embodiment of the present invention, an antenna assembly for a mobile terminal includes a radiating unit that is integrated with a cover of a mobile terminal and is made of a conductive material; the radiation is when the cover is fastened to the mobile terminal. The unit and the bottom plate of the printed circuit board in the mobile terminal form a structure similar to the microstrip patch antenna, and the distance between the radiating element and the printed circuit board is 5 mm. Figure 6a specifically shows a plan view of a radiating element 606 in the antenna assembly of this embodiment. As shown, the radiating element 606 is 55 mm x 54 mm in size and includes a first antenna 埠 661 and a second antenna 埠 662 thereon. Taking the lower left corner of the radiating element 606 as shown in the figure as the coordinate origin, the coordinates of the center position of the antenna 埠 661 are (27.5 mm, 14 mm), and the coordinates of the center position of the antenna 埠 662 are (19 mm, 29 mm). In this case, the mode excited by the antenna 埠 661 approximates the TM ₀₁ mode of the microstrip patch antenna polarized in the y direction, and the antenna 埠 662 is excited by the TM ₁₀ mode polarized in the x direction. Orthogonal to each other. Figure 6b shows the performance curve of the antenna 图 shown in Figure 6a. The return loss of the antenna 埠 661 | S ₁₁ | The curve is shown by a curve marked with a triangle, the return loss of the antenna 埠 662 | S ₁₁ | The curve is shown by a curve with a circular mark, and the transmission between the antennas 661 and 662 The coefficient |S ₂₁ | curve is shown by an unmarked curve. As shown in the figure, in the frequency range of the wireless local area network (2400 MHz~2483 MHz), the in-band return loss of the antennas 661 and 662 are less than -6 dB, and the isolation between each other is higher than 20 dB, which has good performance. It can meet the high isolation and high efficiency requirements of MIMO systems for multi-antenna systems.

Those skilled in the art should understand that the above embodiments are illustrative and not restrictive. Different technical features that appear in different embodiments can be combined to achieve a beneficial effect. Other variations of the disclosed embodiments can be understood and effected by those skilled in the <RTIgt; In the scope of the patent application, the term "comprising" does not exclude other devices or steps; the word "a" does not exclude a plurality of terms; the terms "first" and "second" are used to indicate a name rather than to indicate any particular order. . Any reference signs in the patent application should not be construed as limiting the scope of the invention. The functions of the various parts appearing in the scope of the patent application may be implemented by a single hardware or software module, and the function of a certain part may also be implemented by a plurality of different hardware or software modules. The appearance of certain technical features in different accessory claims does not mean that these technical features cannot be combined to achieve a beneficial effect.

10‧‧‧Mobile terminal

20‧‧‧Mobile terminal

30‧‧‧Mobile terminal

50‧‧‧Mobile terminal

101‧‧‧Electrical back cover

102‧‧‧Printed circuit board (PCB)

103‧‧‧ front panel

104‧‧‧ Non-conductive outer casing

105‧‧‧Independent internal antenna

111‧‧‧Signal Processing Module

112‧‧‧Signal Processing Module

113‧‧‧Signal Processing Module

151‧‧‧Feeding unit

152‧‧‧Feeding unit

153‧‧‧Feeding unit

202‧‧‧Printed circuit board

206‧‧‧radiation unit

208‧‧‧Antenna

251‧‧‧Feeding unit

252‧‧‧Feeding unit

261‧‧‧Antenna

262‧‧‧Antenna

301‧‧‧Back cover

302‧‧‧Printed circuit board

303‧‧‧ front panel

311‧‧‧Signal processing module or circuit

351‧‧‧Feeding unit

411‧‧‧Feeding unit

451‧‧‧Multi-frequency antenna

460‧‧‧Gating unit

461‧‧‧Signal processing module or circuit

462‧‧‧Signal processing module or circuit

502‧‧‧Printed circuit board

506‧‧‧radiation unit

551‧‧‧Feeding unit

552‧‧‧Feeding unit

561‧‧‧First antenna

562‧‧‧Second antenna

606‧‧‧radiation unit

661‧‧‧First antenna

662‧‧‧Second antenna

1 shows an exploded structural view of a portion of a mobile terminal according to an embodiment of the present invention; 2a shows an exploded structural view of a portion of a mobile terminal according to another embodiment of the present invention; FIG. 2b shows a plan view of the radiating unit of the mobile terminal in FIG. 2a; and FIG. 2c shows the mobile terminal shown in FIG. 2a. Figure 9d shows the transmission coefficient curve of each antenna in the mobile terminal shown in Figure 2a; Figure 3 shows the decomposition of a part of the mobile terminal according to another embodiment of the present invention. FIG. 4 is a block diagram showing a logical structure of a part of a mobile terminal according to another embodiment of the present invention; FIG. 5 is an exploded structural view showing a part of a mobile terminal according to another embodiment of the present invention; A plan view of a radiating element in an antenna assembly in accordance with another embodiment of the present invention; and Figure 6b shows a return loss and transmission coefficient curve of the antenna port shown in Figure 6a.

Throughout the drawings, the same or similar reference numerals indicate corresponding features.

20‧‧‧Mobile terminal

202‧‧‧Printed circuit board

206‧‧‧radiation unit

208‧‧‧Antenna

251‧‧‧Feeding unit

252‧‧‧Feeding unit

261‧‧‧Antenna

262‧‧‧Antenna

Claims (13)

An antenna assembly for a mobile terminal, comprising: a radiating unit having a first edge and a second edge, the radiating unit being integrated on a part of the cover of the mobile terminal and composed of a conductive material The remaining portion of the cover is composed of a non-conductive material; the radiating element includes a plurality of antennas formed thereon, each of the plurality of antennas capable of exciting the radiating element to operate in different frequency bands; wherein the plurality Each of the antennas is different in distance from the first edge and the distance between each of the plurality of antennas is different from the second edge; wherein the cover is fastened to the mobile terminal The plurality of antennas can excite the radiating element to operate in a plurality of frequency bands simultaneously; and wherein the antenna assembly further comprises: a bottom plate of one of the printed circuit boards of the mobile terminal; and a pair of the antennas a corresponding at least one feeding unit disposed on the printed circuit board and feeding a corresponding antenna ;; and an antenna disposed on the printed circuit board is not Unit covers one radio area. The antenna assembly of claim 1, wherein the at least one feeding unit and the plurality of antennas are connected by a contact or a contactless connection. The antenna assembly of claim 1, wherein the plurality of frequency bands comprise any combination of frequency bands corresponding to the following communication protocols: GPS, Bluetooth, WiFi, tone Frequency broadcast, mobile TV, GSM, CDMA, WCDMA, TD-SCDMA, LTE, WiMAX. The antenna assembly of claim 1, wherein the outer surface of the radiating element is also covered with an electrically insulating layer. The antenna assembly of claim 1, wherein the conductive material comprises a metal, a conductive plastic or a conductive rubber. The antenna assembly of claim 1, wherein the at least one antenna 埠 comprises at least one multi-frequency antenna 埠, the multi-frequency antenna 埠 capable of exciting the radiating unit to operate in a subset of the plurality of frequency bands, the subset comprising the plurality At least two of the bands. An action terminal comprising the antenna assembly of any one of claims 1 to 6. A mobile terminal comprising the antenna assembly of claim 6 and further comprising a gating unit coupled to the multi-frequency antenna. An antenna assembly for a mobile terminal, comprising: a radiating unit having a first edge and a second edge, the radiating unit being integrated on a part of the cover of the mobile terminal and composed of a conductive material The remaining portion of the cover is made of a non-conductive material; the radiating element includes a plurality of antennas formed thereon; wherein a distance between each of the plurality of antennas and the first edge is different and the distance Each of the plurality of antennas is different in distance from the second edge; wherein when the cover is fastened to the mobile terminal, at least two of the plurality of antennas can excite the radiating element to operate Positive in the same frequency band And the antenna assembly further includes: a bottom plate of one of the printed circuit boards of the mobile terminal; and at least one feeding unit corresponding to the antennas in one-to-one correspondence, the at least one feeding unit And disposed on the printed circuit board and fed to the corresponding antenna ;; and an antenna is disposed on an area of the printed circuit board that is not covered by the radiation unit. The antenna assembly of claim 9, wherein the contact unit and the antenna unit are connected by a contact or a contactless connection. The antenna assembly of claim 9, wherein the outer surface of the radiating element is also covered with an electrically insulating layer. The antenna assembly of claim 9, wherein the conductive material comprises a metal, a conductive plastic or a conductive rubber. An action terminal comprising the antenna assembly of any one of claims 9 to 12.