Mobile terminal and antenna of mobile terminal

A mobile terminal and an antenna of a mobile terminal are provided. The mobile terminal includes: a printed wiring board; a housing; a metal frame surrounding the housing, having a first frame, a second frame and a third frame, the first frame having a first gap; a first connector connected with a part of the first frame; a second connector connected with the third frame and a ground of the printed wiring board; and a first antenna, including: a main radiator; a first part; a second part; a first inductor; a third part; a fourth part a second inductor connected with the fourth part and a fifth part connected with the second inductor and a first feed terminal of the printed wiring board.

CROSS REFERENCE TO RELATED APPLICATION

This application is based upon International Application No. PCT/CN2015/098286, filed on Dec. 22, 2015, which claims priority and benefits of Chinese Patent Application No. 201410833452.8, filed with State Intellectual Property Office, P. R. C. on Dec. 26, 2014, and Chinese Patent No. 201420840199.4, filed with State Intellectual Property Office, P. R. C. on Dec. 26, 2014, the entire contents of which are incorporated herein by reference.

FIELD

Embodiments of the present disclosure generally relate to a mobile terminal, and more particularly to a mobile terminal and an antenna of the mobile terminal.

BACKGROUND

Nowadays, due to beautiful metal texture, a mobile terminal with metal frame gets more and more popular. However, the metal frame surrounding the antenna can significantly restrain the radiation of the antenna, thus increasing the difficulty for designing such mobile terminal.

For the 4G mobile terminal, in the related art, there are two main solutions currently applied in the diversity antenna, the GPS (Global Positioning System) antenna, and the BT (Bluetooth) & WLAN (Wireless Local Area Network) antenna.

The first solution refers to a traditional solution, i.e. by using FPC (Flexible Printed Circuit) or LDS (Laser Direct Structuring) production process, the antenna is disposed on an isolated plastic bracket or plastic shell. The antenna testing of this solution has no essential difference with that of the traditional mobile terminal with nonmetal frame. The metal frame is used as a part of the antenna ground, meanwhile a gap of about 0.8 mm˜1 mm is provided at a proper position of the metal frame, and the ground point of the metal frame is optimized, thus reducing the influence of the metal frame on the antenna testing and the performance of the mobile terminal.

The second solution is that the metal frame is divided into several segments by the gaps and the ground point, and is directly fed, meanwhile the PWB (Printed Wiring Board) is provided with the traditional circuit to obtain the performance and the resonant frequency of the antenna.

The first solution has following disadvantages. By using the traditional design and traditional production process, the cost is high; and what is more, the metal frame cannot be integrated with the antenna, which causes a poor RF performance for the antenna.

The second solution has disadvantages of difficulty on the antenna testing. Because the segmentalized metal frame is directly fed to be the antenna, when the size of the metal frame mismatches the resonance and the radiation of the antenna, it is difficult to perform a manual testing (because it is difficult to enlarge or shorten the size of the metal frame manually), and the production period will be prolonged and the expense will be increased if a new mold is required to be prepared or the old mould is required to be modified.

SUMMARY

Embodiments of the present disclosure seek to solve at least one of the problems existing in the related art to at least some extent.

Embodiments of a first aspect of the present disclosure provide a mobile terminal. The mobile terminal includes: a printed wiring board; a housing; a metal frame surrounding the housing, and having a first frame, a second frame and a third frame, wherein the first frame and the second frame are disposed on two opposite sides of the housing respectively, the third frame is disposed on a top side of the housing and is connected with the first frame and the second frame respectively, and the first frame has a first gap; a first connector, having a first terminal connected with a part of the first frame between the first gap and the third frame and a second terminal; a second connector, having a first terminal connected with the third frame and a second terminal connected with a ground of the printed wiring board; and a first antenna, including: a main radiator of the first antenna consisting of a part of the first frame and a part of the third frame connected between the first connector and the second connector; a first part, having a first terminal connected with the second terminal of the first connector and a second terminal, and parallel with the first frame; a second part, having a first terminal connected with the second terminal of the first part and a second terminal, and parallel with the third frame; a first inductor, having a first terminal connected with the second terminal of the second part and a second terminal connected with the ground of the printed wiring board; a third part, having a first terminal floated and a second terminal, and parallel with the second part, wherein the second part is disposed between the third part and the third frame; a fourth part having a first terminal connected with the second terminal of the third part and a second terminal, and parallel with the first part; a second inductor having a first terminal connected with the second terminal of the fourth part and a second terminal; and a fifth part having a first terminal connected with the second terminal of the second inductor and a second terminal connected with a first feed terminal of the printed wiring board, and parallel with the first part.

The mobile terminal according to embodiments of the present disclosure has the following advantages: first, there is no additional antenna element required, thus greatly reducing a cost; second, using the metal frame as the main radiator and using wiring, feeding and matching in a clearance zone of the printed wiring board, an integrated design is performed on the antenna, thus improving the utilization of the antenna space; third, for the antenna testing during the product development, it is not required to perform a fine adjustment to the shape and dimension of the metal frame, so as to avoid modifying the mold for fabricating the metal frame, to accelerate the development and testing of the antenna, and the testing is convenient and flexible; fourth, in the premise of ensuring the necessary antenna RF performance, the antenna occupies a small area of the printed wiring board, which greatly saves the valuable space of the printed wiring board.

Embodiments of a second aspect of the present disclosure provide an antenna of the mobile terminal, the antenna of the mobile terminal includes: a first antenna part having a first terminal grounded and a second terminal; a second antenna part, having a rectangular shape with an opening, wherein the opening has a first terminal connected with the second terminal of the first antenna part and a second terminal, the first antenna part is perpendicular to one side of the rectangular shape of the second antenna part where the opening is disposed; a first inductor having a first terminal connected with the second terminal of the first antenna part and a second terminal connected with the second terminal of the opening; a third antenna part, having a first terminal and a second terminal floated, and parallel with the one side of the rectangular shape of the second antenna part; and a second inductor having a first terminal connected with the first terminal of the third antenna part and a second terminal connected with a power supply of a printed wiring board.

The antenna of the mobile terminal according to embodiments of the present disclosure has the following advantages: first, there is no additional antenna element required, thus greatly reducing a cost; second, for the antenna testing during the product development, it is not required to perform a fine adjustment to the shape and dimension of the metal frame, so as to avoid modifying the mold for fabricating the metal frame, to accelerate the development and testing of the antenna, and the testing is convenient and flexible; third, in the premise of ensuring the necessary antenna RF performance, the antenna occupies a small area of the printed wiring board, which greatly saves the valuable space of the printed wiring board.

DETAILED DESCRIPTION

Reference will be made in detail to embodiments of the present disclosure. Embodiments of the present disclosure will be shown in drawings, in which the same or similar elements and the elements having same or similar functions are denoted by like reference numerals throughout the descriptions. The embodiments described herein according to drawings are explanatory and illustrative, not construed to limit the present disclosure.

Various embodiments and examples are provided in the following description to implement different structures of the present disclosure. In order to simplify the present disclosure, certain elements and settings will be described. However, these elements and settings are only by way of example and are not intended to limit the present disclosure. In addition, reference numerals may be repeated in different examples in the present disclosure. This repeating is for the purpose of simplification and clarity and does not refer to relations between different embodiments and/or settings. Furthermore, examples of different processes and materials are provided in the present disclosure. However, it would be appreciated by those skilled in the art that other processes and/or materials may be also applied. Moreover, a structure in which a first feature is “on” a second feature may include an embodiment in which the first feature directly contacts the second feature, and may also include an embodiment in which an additional feature is formed between the first feature and the second feature so that the first feature does not directly contact the second feature.

In the description of the present disclosure, unless specified or limited otherwise, it should be noted that, terms “mounted,” “connected” and “coupled” may be understood broadly, such as electronic connections or mechanical connections, inner communications between two elements, direct connections or indirect connections through intervening structures, which can be understood by those skilled in the art according to specific situations.

With reference to the following descriptions and drawings, these and other aspects of embodiments of the present disclosure will become apparent. In the descriptions and drawings, some particular embodiments are described in order to show the principles of embodiments according to the present disclosure, however, it should be appreciated that the scope of embodiments according to the present disclosure is not limited herein. On the contrary, changes, alternatives, and modifications can be made in the embodiments without departing from spirit, principles and scope of the attached claims.

In the following, an antenna of the mobile terminal and a mobile terminal are described in detail with reference to drawings.

FIG. 1is a schematic diagram of an antenna of the mobile terminal according to an embodiment of the present disclosure. As shown inFIG. 1, the antenna of the mobile terminal includes a first antenna part11, a second antenna part12, a first inductor L1, a third antenna part2, and a second inductor L2. The first antenna part11has a first terminal grounded and a second terminal. The second antenna part12has a rectangular shape with an opening13, the opening13has a first terminal connected with the second terminal of the first antenna part11and a second terminal. The first antenna part11is perpendicular to one side of the rectangular shape of the second antenna part12where the opening13is disposed. The first inductor L1has a first terminal connected with the second terminal of the first antenna part11and a second terminal connected with the second terminal of the opening13. The third antenna part2has a first terminal and a second terminal, and is parallel with the one side of the rectangular shape of the second antenna part12. The second terminal of the third antenna part2is floated. The second inductor L2has a first terminal connected with the first terminal of the third antenna part2and a second terminal connected with a power supply D of a printed wiring board.

In an embodiment, the antenna of the mobile terminal can be disposed on a clearance zone of the printed wiring board at an upper left corner or an upper right corner of the mobile terminal, the ground of the printed wiring board is disconnected on the clearance zone of the printed wiring board. An area of the clearance zone of the printed wiring board is about 10*12 mm, the clearance zone of the printed wiring board reserves the dielectric substrate of the printed wiring board to hold antenna lines of the mobile terminal (such as the first antenna part11, the second an antenna part12and the third antenna part2) and to place antenna matching devices (such as the first inductor L1and the second inductor L2).

In an embodiment, a concept form of the antenna of the mobile terminal is evolved from a “Loop” antenna (“Loop” indicates that a shape of the antenna according to embodiments of the present disclosure is “loop-shaped” but the antenna according to embodiments of the present disclosure is not a real conventional loop antenna) with a terminal grounded. A parallel antenna (i.e. the first inductor L1), a capacitive coupling feed, and a series inductor (i.e. the second inductor L2) are introduced in the “Loop” antenna, such that the “Loop” antenna having only one resonant mode excites two resonant modes, thus extending the bandwidth or obtaining a dual-band resonant mode.

An evolution process of the concept form of the antenna of the mobile terminal is illustrated as follows.

FIG. 2is a schematic diagram showing an evolution process of a concept form of an antenna of a mobile terminal according to an embodiment of the present disclosure. As shown inFIG. 2, an ANT1 antenna is an original state of the antenna, the ANT1 antenna is a “Loop” antenna with a terminal grounded.FIG. 3is a schematic diagram showing an impedance frequency curve corresponding to each generation of antenna shown inFIG. 2.FIG. 4is a schematic diagram showing an RL frequency curve corresponding to each generation of antenna shown inFIG. 2. As shown inFIG. 3andFIG. 4, the ANT1 antenna only has one resonant frequency (about 2.18 GHz). Furthermore, a shape and a size of the ANT1 antenna are not designed for a particular frequency band, such that an optimized antenna impedance is not obtained, but an ANT2 antenna, an ANT3 antenna and an ANT4 antenna can excite for the particular frequency band (such as GPS band, BT & WLAN band) to obtain a desired resonant mode and band width.

As shown inFIG. 2, the loop of the ANT1 antenna is connected with the first inductor L1with an appropriate inductance (the first inductor L1is configured to reduce a loop area of the ANT1 antenna, and to play a role of matching parallel inductor in a normal sense because a low-pass characteristic of the first inductor L1mainly lies in changing an equivalent loop area of a low frequency band) in parallel to form the ANT2 antenna, and thus an antenna impedance of the ANT2 antenna (such as an antenna impedance with respect to GPS frequency band (1.565˜1.585 GHz)) shifts to an inductance area matching with the capacitive coupling feed. As shown inFIG. 3andFIG. 4, it can be seen that the antenna impedance of the ANT2 antenna has a fine adjustment, particularly in the impedance of the low frequency band, but which influents slightly on an RL curve of the ANT2 antenna particularly on a resonant frequency of the ANT2 antenna.

As shown inFIG. 2, based on the ANT2 antenna, a direct feed is changed into a capacitive coupling feed to form the ANT3 antenna, and a coupling capacitance of the ANT3 antenna may be fine adjusted by adjusting both a size of a space gap between wires and a cross area. As shown inFIG. 3andFIG. 4, it can be seen that an antenna impedance of the ANT3 antenna has a significant deflection (most of the antenna impedance of the ANT3 antenna is deflected to a capacitance zone) by the appropriate capacitive coupling feed (the capacitance coupling feed can be approximately equivalent to connecting a capacitor in a feed circuit in series for matching), meanwhile, a resonance is excited around the GPS frequency band.

As shown inFIG. 2, based on the ANT3 antenna, the second inductor L2with an appropriate inductance is connected in the feed circuit (the feed loop comprises the first antenna part11, the second antenna part12, the first inductor L1and the third antenna part2) in parallel to form the ANT4 antenna. The ANT4 antenna is the antenna provided in the embodiments of the present disclosure. As shown inFIG. 3andFIG. 4, it can be seen that compared with the antenna impedance of the ANT3 antenna, an antenna impedance of the ANT4 antenna is deflected from the capacitance zone to an inductance zone because of an existence of the second inductor L2connected in the feed circuit in series, a resonance is excited in the BT & WLAN frequency band (2.4˜2.485 GHz), while a low frequency impedance of the ANT4 antenna is also fine adjusted, such that a resonance excited by the capacitive coupling feed of the ANT3 antenna is fine adjusted to the GPS frequency band (1.565˜1.685 GHz).

FIG. 5is a schematic diagram showing an RL frequency curve corresponding to the ANT4 antenna according to an embodiment of the present disclosure.FIG. 6is a schematic diagram showing an RL frequency curve corresponding to the ANT4 antenna according to another embodiment of the present disclosure. In the RL frequency curve shown inFIG. 5, two resonant frequency excited by the ANT4 antenna are close to each other, and thus the RL bandwidth of a single frequency band may be designed wider applicable for LTE diversity antennas. In the RL frequency curve shown inFIG. 6, two resonant frequencies (low frequency resonances3,4and high frequency resonances5,6) excited by the ANT4 antenna is relatively far away from each other, which can be used as a dual band antenna applicable for the GPS antenna and the BT & WLAN antenna.

In an embodiment, the conventional “Loop” antenna is evolved and improved by introducing a parallel inductor (i.e. the first inductor L1) in the loop, the capacitive coupling feed and a series inductor (i.e. the second inductor L2) in the feed circuit, such that an impedance conversion effect identical with an impedance conversion effect achieved by performing a fine adjustment on the shape and the size of antenna radiators (i.e., a metal frame) is obtained by changing the inductance of the parallel inductor in the loop, and the mode of the antenna is changed from a narrowband single resonant mode to a broadband dual resonant mode (i.e., two fine-adjustable resonant modes are excited from the single resonant mode).

The mobile terminal according to embodiments of the present disclosure has the following advantages: first, there is no additional antenna element required, thus greatly reducing a cost; second, using the metal frame as the main radiator and using wiring, feeding and matching in a clearance zone of the printed wiring board, an integrated design is performed on the antenna, thus improving the utilization of the antenna space; third, for the antenna testing during the product development, it is not required to perform a fine adjustment to the shape and dimension of the metal frame, so as to avoid modifying the mold for fabricating the metal frame, to accelerate the development and testing of the antenna, and the testing is convenient and flexible; fourth, in the premise of ensuring the necessary antenna RF performance, the antenna occupies a small area of the printed wiring board, which greatly saves the valuable space of the printed wiring board.

Embodiments of a second aspect of the present disclosure provide an antenna of the mobile terminal.FIG. 7is a schematic diagram of a mobile terminal according to a first embodiment of the present disclosure. As shown inFIG. 7, the mobile terminal (such as a mobile phone) includes: a housing71, a printed wiring board72, a metal frame73, a first connector74, a second connector75and a first antenna76.

The housing71covers the printed wiring board72. The metal frame73surrounds the housing71, and the metal frame73has a first frame731, a second frame732and a third frame733. The first frame731and the second frame732are disposed on two opposite sides of the housing71respectively, the third frame733is disposed on a top side of the housing71and is connected with the first frame731and the second frame732respectively, and the first frame731has a first gap734. The first connector74has a first terminal connected with a part of the first frame731between the first gap734and the third frame733and a second terminal. The second connector75has a first terminal connected with the third frame733and a second terminal connected with a ground of the printed wiring board72. The first antenna76includes a main radiator F1of the first antenna, a first part761, a second part762, a first inductor763a third part764, a fourth part765, a second inductor766and a fifth part767. The main radiator F1of the first antenna consists of a part of the first frame and a part of the third frame connected between the first connector74and the second connector75. The first part761has a first terminal connected with the second terminal of the first connector74and a second terminal, and is parallel with the first frame731. The second part762has a first terminal connected with the second terminal of the first part761and a second terminal, and is parallel with the third frame733. The first inductor763has a first terminal connected with the second terminal of the second part762and a second terminal connected with the ground of the printed wiring board. The first inductor763is a parallel inductor of an original “Loop” antenna of the first antenna76. The third part764has a first terminal floated and a second terminal, and is parallel with the second part762. The second part762is disposed between the third part764and the third frame733, that is, the third part764is under the second part762(compared with the third part764, the second part762is more close to a top of the housing71). The fourth part765has a first terminal connected with the second terminal of the third part764and a second terminal, and is parallel with the first part761. The second inductor766has a first terminal connected with the second terminal of the fourth part765and a second terminal. The fifth part767has a first terminal connected with the second terminal of the second inductor766and a second terminal connected with a first feed terminal of the printed wiring board72, and is parallel with the first part761. The second inductor766is a series inductor of the first antenna76, and is configured to excite a high frequency band resonance of the first antenna76.

In an embodiment, the third frame733has a first terminal and a second terminal, the first frame731has a first terminal and a second terminal, and the second frame732has a first terminal and a second terminal. The first terminal of the first frame731is connected with the first terminal of the third frame733, and the first terminal of the second frame732is connected with the second terminal of the third frame733.

FIG. 8is a schematic diagram of a mobile terminal according to a second embodiment of the present disclosure. In an embodiment, as shown inFIG. 8, there is a first predetermine distance (i.e., a space gap of about 0.5 mm, having an equivalent coupling capacitance) between the second part762and the third part764to form the capacitive coupling feed, and the capacitive coupling feed can excite the low frequency band resonance of the second antenna710. Furthermore, the distance (a space gap of about 1.5 mm) between each of the fourth part765, the second inductor766and the fifth part767and the ground of the printed wiring board72can be adjusted respectively.

As shown inFIG. 8, the mobile terminal further includes: a third connector77, the third connector77has a first terminal connected with a part of the first frame731between the first gap734and the second terminal of the first frame731and a second terminal connected with the ground of the printed wiring board72. In an embodiment, the first gap734may be disposed at a position which is a second predetermined distance (e.g., 10 mm˜12 mm) away from a top of the housing71, the first gap734may be a narrow gap which has a width of about 1.5 mm, and thus the first frame731of the metal frame73is disconnected at the first gap such that the first antenna76may radiate in this way. In an embodiment, the first gap734is disposed at a position which is 12 mm away from the top of the housing71, a line width of each of the first part761, the second part762, the third part764, the fourth part765and the fifth part767is 0.5 mm, the first inductor763is 17 nH, and the second inductor766is 6 nH.

In an embodiment, as shown inFIG. 8, the first antenna76can be disposed on the clearance zone of the printed wiring board72at the upper right corner of the mobile terminal, the ground of the printed wiring board72is disconnected on the clearance zone of the printed wiring board. The area of the clearance zone of the printed wiring board72is about 10*12 mm, the clearance zone of the printed wiring board72reserves the dielectric substrate of the printed wiring board to hold the first antenna76(such as the first part761, the second part762, the third part764, the fourth part765and the fifth part767) and to place antenna matching devices (such as the first inductor763and the second inductor766).

In an embodiment, the second connector75is short-connected between the third frame733at the top of the housing71and the ground of the printed wiring board72, meanwhile the second connector75enables an end of the original “Loop” antenna of the first antenna76grounded. In addition, in order to enable the impedance of the original “Loop” antenna of the first antenna76to fall into an appropriate fine-adjustable matching impedance area, a distance between the second connector75and an edge of the clearance zone of the printed wiring board72may vary with different required antenna frequency bands of the first antenna76. For example, for the LTE Diversity antenna, the second connector75may be directly disposed at the edge of the clearance zone of the printed wiring board72. For the GPS antenna, the BT antenna and the WLAN antenna, the second connector75may be disposed at a position which is about 10 mm˜15 mm away from the edge of the clearance zone of the printed wiring board72.

In an embodiment, once a structure, a shape and a size of the frame of the main radiator F1is designed, there is no need to change the main radiator F1, while the resonance and the band width testing fully depend on fine adjustments of wiring of the first antenna76on the clearance zone of the printed wiring board72. By changing a width and a length of the space gap between the third part764and the second part762, an equivalent coupling capacitance is fine adjusted, such that the capacitive coupling feed can excite a low frequency band resonance required by the first antenna76. By changing the inductance of the first inductor763, the low frequency impedance of the first antenna76may be adjusted conveniently, and the low frequency band resonant frequency of the first antenna76is shifted. In an actual application, an end length of the third part764may be fine adjusted so as to change the equivalent coupling capacitance for a convenience of testing. In addition, the second inductor766can excite the high frequency band resonance required by the first antenna76, and a high frequency band resonant frequency of the second inductor766can be adjusted by changing the inductance of the second inductor766. By changing a width and a length of the space gap between the fourth part765and the ground of the printed wiring board72, a loop area of the original “Loop” antenna of the first antenna76can be adjusted, and then the impedance of the first antenna76can be adjusted (for example, the fine-adjustment impedance of the first antenna76indicates a depth of the resonant point RL, or the RL point depth between the high frequency band resonance and the low frequency band resonance).

In an embodiment, the first antenna76may be a GPS antenna, a BT antenna, or a WLAN antenna.

FIG. 9is a schematic diagram of a mobile terminal according to a third embodiment of the present disclosure. As shown inFIG. 9, the second frame732has a second gap735, and the mobile terminal further includes: a fourth connector78, a fifth connector79and a second antenna710. The fourth connector78has a first terminal connected with a part of the second frame732between the second gap735and the third frame733. The fifth connector79has a first terminal connected with the third frame733and a second terminal connected with the ground of the printed wiring board72. The second antenna710includes: a main radiator F2of the second antenna, a sixth part711, a seventh part712, a third inductor713, an eighth part714, a ninth part715, a fourth inductor716, and a tenth part717. The main radiator F2of the second antenna consists of a part of the second frame and a part of the third frame connected between the fourth connector78and the fifth connector79(that is, a part of the second frame732between the fourth connector78and the third frame733and a part of the third frame733between the fifth connector79and the second frame732). The sixth part711has a first terminal connected with the second terminal of the fourth connector78and a second terminal, and is parallel with the second frame732. The seventh part712has a first terminal connected with the second terminal of the sixth part711and a second terminal, and is parallel with the third frame733. The third inductor713has a first terminal connected with the second terminal of the seventh part712and a second terminal connected with the ground of the printed wiring board72. The third inductor713is the parallel inductor of the second antenna710. The eighth part714has a first terminal floated and a second terminal, and is parallel with the seventh part712, and the seventh part712is disposed between the third frame733and the eighth part714, that is, the eighth part714is under the seventh part712(compared with the eighth part714, the seventh part712is more close to the top of the housing71). The ninth part715has a first terminal connected with the second terminal of the eighth part714and a second terminal, and is parallel with the sixth part711. The fourth inductor716has a first terminal connected with the second terminal of the ninth part715. The tenth part717has a first terminal connected with a second terminal of the fourth inductor716and a second terminal connected with a second feed terminal D2of the printed wiring board, and is parallel with the sixth part711. The fourth inductor716is the series inductor of the second antenna710, and is configured to excite the high frequency band resonance of the second antenna710.

In an embodiment, as shown inFIG. 9, there is a first predetermine distance (i.e., a space gap of about 0.5 mm, having an equivalent coupling capacitance) between the seventh part712and the eighth part714to form the capacitive coupling feed, and the capacitive coupling feed can excite the low frequency band resonance of the second antenna710. Furthermore, the distance (a space gap of about 1.5 mm) between each of the tenth part717, the fourth inductor716and the tenth part717and the ground of the printed wiring board72can be adjusted respectively. In an embodiment, the second antenna710may be an LTE antenna (LTE Diversity antenna).

In an embodiment, as shown inFIG. 9, the mobile terminal further includes a sixth connector718. The sixth connector718has a first terminal connected with a part of the second frame732between the second gap735and the second terminal of the second frame732and a second terminal connected with the ground of the printed wiring board72. The second frame732under the second frame732is a metal frame between the second frame732and the bottom of the housing71. In an embodiment, the second gap735can be disposed at a position which is a second predetermined distance (e.g., 10 mm˜12 mm) away from the top of the housing71, the second gap735can be a narrow gap which has a width of 1.5 mm, and thus the second frame732of the metal frame73is disconnected at the second gap such that the second antenna710may radiate in this way. In an embodiment, the second gap735is disposed at a position which is 12 mm away from the top of the housing71, a line width of each of the sixth part711, the seventh part712, the eighth part714, the ninth part715and the tenth part717is 0.5 mm, the third inductor713is 4 nH, and the second inductor766is 3.6 nH.

In an embodiment, a necessary ground point is designed, such that metal frames other than the main radiator F1of the first antenna and the main radiator F2of the second antenna can be well connected with the ground of the printed wiring board72or other metal ground (for example, an injected metal embedded in the housing71), so as to ensure the mobile terminal is grounded. For example, the ninth connector719and the tenth connector720are designed, and thus the first frame731under the first gap734is connected with the ground of the printed wiring board72, and the eleventh connector721and the twelfth connector722are designed, and thus the second frame732under the second gap735is connected with the ground of the printed wiring board72.

In an embodiment, as shown inFIG. 9, the second antenna710can be disposed on a clearance zone of the printed wiring board72at the upper left corner of the mobile terminal, the ground of the printed wiring board72is disconnected on the clearance zone of the printed wiring board. An area of the clearance zone of the printed wiring board72is 10*12 mm, the clearance zone of the printed wiring board72reserves the dielectric substrate of the printed wiring board72to hold the second antenna710of the mobile terminal (such as the sixth part711, the seventh part712, the eighth part714, the ninth part715and the tenth part717) and to place antenna matching devices (such as the third inductor713and the fourth inductor716).

In an embodiment, the fifth connector79is short-connected between the third frame733at the top of the housing71and the ground of the printed wiring board72, meanwhile the fifth connector79enables an end of the original “Loop” antenna of the second antenna710grounded. In addition, in order to enable the impedance of the original “Loop” antenna of the second antenna710to fall into an appropriate fine-adjustable matching impedance area, a distance between the fifth connector79and an edge of the clearance zone of the printed wiring board72may vary with different required antenna frequency bands of the second antenna710. For example, for the LTE Diversity antenna, the fifth connector79may be directly disposed at the edge of the clearance zone of the printed wiring board72; for the GPS antenna, the BT antenna and the WLAN antenna, the fifth connector79may be disposed at the position which is about 10 mm-15 mm away from the edge of the clearance zone of the printed wiring board72.

In an embodiment, once a structure, a shape and a size of the frame of the main radiator F2of the second antenna is designed, there is no need to change the main radiator F2of the second antenna, while the resonance and the band width testing fully depend on fine adjustments of wiring of the second antenna710on the clearance zone of the printed wiring board72. By changing a width and a length of the space gap between the seventh part712and the eighth part714, an equivalent coupling capacitance is fine adjusted, such that the capacitive coupling feed can excite a low band resonant needed by the second antenna710. By changing the inductance of the fourth inductor716, the low frequency impedance of the second antenna710may be adjusted conveniently, and the low frequency band resonant frequency of the second antenna710is shifted. In an actual application, an end length of the eighth part714may be adjusted so as to change the equivalent coupling capacitance for a convenience of testing. In addition, the fourth inductor716can excite the high frequency band resonance required by the second antenna710, a high frequency band resonant frequency of the fourth inductor716can be adjusted by changing the inductance of the fourth inductor716. By changing a width and a length of the space gap between the ninth part715and the ground of the printed wiring board72, a loop area of the original “Loop” antenna of the second antenna710can be adjusted, and then the impedance of the second antenna710can be adjusted (for example, the fine adjustment impedance of the second antenna710indicates a depth of the resonant point RL, or the RL point depth between the high frequency band resonance and the low frequency band resonance).

FIG. 10is a schematic diagram showing an impedance frequency curve and an isolation frequency curve corresponding to the first antenna and the second antenna according to an embodiment of the present disclosure.FIG. 11is a schematic diagram showing an RL frequency curve corresponding to the first antenna and the second antenna according to an embodiment of the present disclosure. The first antenna76is a GPS antenna, a BT antenna, or a WLAN antenna and the second antenna710is an LTE Diversity antenna. As shown inFIG. 10andFIG. 11, a bandwidth performance of an impedance of the first antenna76and the second antenna710of the mobile terminal is good, and an isolation between the first antenna76and the second antenna710can meet requirements (a typical isolation is less than −15 dB).

With the mobile terminal according to embodiments of the present disclosure, the antenna is divided into two parts, the main radiators formed by the corner metal frames and the antenna feed and the matching network part on the clearance zone of the printed wiring board72, the antenna is not required to be formed onto an isolated plastic support or a plastic housing by using an FPC or LDS process, and the main radiators formed by the corner metal frames are different from the traditional antenna, the fine adjustment of the resonant frequency and the bandwidth of the antenna does not rely on adjustments of the dimensions of the mental frames, so that once the structure of the mobile terminal (such as the mobile phone), especially the metal frame73is designed, the metal frame73can be remained without changing structure. In addition, the antenna feed and matching network portion is disposed on the clearance zone of about 10*12 mm of the printed wiring board72, the fine adjustment of the resonant frequency and the bandwidth of the antenna can be achieved by fine adjusting the antenna feed and matching network portion. Furthermore, after the integrated basic structure of the antenna is determined, the fine adjustment for the low frequency resonance and the high frequency resonance can be achieved by fine adjusting the parallel inductor in the loop (such as the first inductor763, the third inductor713) and the series inductor in the feed circuit (the second inductor766, the fourth inductor716).

The mobile terminal according to embodiments of the present disclosure has the following advantages: first, there is no additional antenna element required, thus greatly reducing a cost; second, for the antenna testing during the product development, it is not required to perform a fine adjustment to the shape and dimension of the metal frame, so as to avoid modifying the mold for fabricating the metal frame, to accelerate the development and testing of the antenna, and the testing is convenient and flexible; third, in the premise of ensuring the necessary antenna RF performance, the antenna occupies a small area of the printed wiring board, which greatly saves the valuable space of the printed wiring board.

Any procedure or method described in the flow charts or described in any other way herein may be understood to comprise one or more modules, sections or parts for storing executable codes that realize particular logic functions or procedures. Moreover, advantageous embodiments of the present disclosure comprises other implementations in which the order of execution is different from that which is depicted or discussed, including executing functions in a substantially simultaneous manner or in an opposite order according to the related functions. This should be understood by those skilled in the art which embodiments of the present disclosure belong to.

The logic and/or step described in other manners herein or shown in the flow chart, for example, a particular sequence table of executable instructions for realizing the logical function, may be specifically achieved in any computer readable medium to be used by the instruction execution system, device or equipment (such as the system based on computers, the system comprising processors or other systems capable of obtaining the instruction from the instruction execution system, device and equipment and executing the instruction), or to be used in combination with the instruction execution system, device and equipment.

The storage medium mentioned above may be read-only memories, magnetic disks or CD, etc.