CN106876897A - Mobile terminal and its metal back case - Google Patents

Abstract

The present disclosure relates to a mobile terminal and a metal back case thereof, wherein the metal back case includes a bottom plate (11) and a frame connected around the bottom plate, and the metal back case is provided with a ground end for dividing the metal back case ( 10) and the gap between the antenna terminal (20), the ground terminal (10) and the antenna terminal (20) are connected through the insulating material filled in the gap, and the gap is opened on the frame. By making a slit on the frame of the metal back case to separate an independent metal body as the antenna end, it is possible to avoid slits on the bottom plate of the metal back case, thereby ensuring the integrity of the bottom plate, and making the mobile terminal in terms of appearance design and user experience can be improved to a certain extent.

Description

Mobile terminal and its metal back case

technical field

The present disclosure relates to a mobile terminal and a metal rear case thereof.

Background technique

Due to the good metal texture and feel, as well as the advantages of beautiful appearance and low cost, all-metal back shells are increasingly becoming an important development direction for smart phones. However, the metal back shell will cause signal shielding. In order to radiate the mobile phone signal, it is necessary to slit the metal back shell. In the related art, the gap is usually formed on the bottom plate of the metal rear case, which affects the appearance and user experience of the mobile phone.

Contents of the invention

In order to overcome the problems existing in the related art, the present disclosure provides a metal rear case of a mobile terminal, the metal rear case includes a base plate and a frame connected around the base plate, the metal rear case is provided with a A gap divided into a ground terminal and an antenna terminal, the ground terminal and the antenna terminal are connected through an insulating material filled in the gap, wherein the gap is opened on the frame.

Optionally, the slit and the edge of the frame jointly enclose the antenna end.

Optionally, the slit includes a first slit and two second slits located at two ends of the first slit, the first slit extends along the frame, and one end of each second slit is connected to the first slit , and the other end extends to the edge of the frame.

Optionally, both ends of the first slit respectively extend beyond the corresponding second slit.

Optionally, the frame includes a left frame, a right frame, an upper frame and a lower frame, the first slit is in the shape of a "one", and the two second slits are formed on the lower frame.

Optionally, the frame includes a left frame, a right frame, an upper frame and a lower frame, the first slit is L-shaped, one of the two second slits is set on the lower frame, and the other Open on the left or right border.

Optionally, the frame includes a left frame, a right frame, an upper frame and a lower frame, the first slit is U-shaped and runs through the lower frame, one of the two second slits is opened on the left on the frame, and the other on the right frame.

According to another aspect of the present disclosure, there is also provided a mobile terminal, including the above metal rear case.

Optionally, the mobile terminal further includes an excitation source, the excitation source is connected to the feed point of the antenna end, the first ground point of the antenna end is grounded through the first tuning switch circuit, and the second ground point of the antenna end is grounded through the The second tuning switch circuit or the resonant circuit is grounded, and the third ground point of the antenna end is grounded through the third tuning switch circuit.

Optionally, the feed point is located between the first ground point and a third ground point, and the third ground point is located between the feed point and the second ground point.

Optionally, the mobile terminal further includes an excitation source, the excitation source is connected to the feed point of the antenna end through an adjustable matching circuit, the first ground point of the antenna end is grounded through a first tuning switch circuit, and the The second ground point is grounded through the second tuned switching circuit or the resonant circuit.

Optionally, the feed point is located between the first ground point and the second ground point.

Optionally, the first tuning switch circuit includes a first switch, a first capacitor and a first inductor, the static contact of the first switch is connected to the first ground point, and the first The movable contact is an open point, the second movable contact of the first switch is directly grounded, the third movable contact of the first switch is grounded through the first inductance, and the fourth movable contact of the first switch point to ground through the first capacitor.

Optionally, the second tuning switch circuit includes a variable capacitor, and the second ground point is grounded through the variable capacitor.

Optionally, the third tuning switch circuit includes a third switch, a third capacitor, and a third inductor, the static contact of the third switch is connected to the third ground point, and the first The movable contact is an open point, the second movable contact of the third switch is directly grounded, the third movable contact of the third switch is grounded through the third inductance, and the fourth movable contact of the third switch point to ground through the third capacitor.

The technical solution provided by the embodiments of the present disclosure may include the following beneficial effects: by making a slit on the frame of the metal rear case to separate an independent metal body as an antenna end, it is possible to avoid slits on the bottom plate of the metal back case, thereby ensuring The integrity of the bottom plate enables the mobile terminal to be improved to a certain extent in terms of appearance design and user experience.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure.

Description of drawings

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

FIG. 1 is a schematic structural diagram of a first exemplary embodiment of a metal rear case of the present disclosure.

Fig. 2 is a schematic structural diagram of a second exemplary embodiment of a metal rear case of the present disclosure.

Fig. 3 is a schematic structural diagram of a third exemplary embodiment of a metal rear case of the present disclosure.

Fig. 4 is a schematic structural diagram of a fourth exemplary embodiment of a metal rear case of the present disclosure.

Fig. 5 is a schematic structural diagram of a first exemplary embodiment of an antenna of a mobile terminal according to the present disclosure.

FIG. 6 is a schematic structural diagram of a second exemplary embodiment of an antenna of a mobile terminal of the present disclosure.

Fig. 7 is a schematic structural diagram of a third exemplary embodiment of an antenna of a mobile terminal of the present disclosure.

FIG. 8 is a schematic structural diagram of a fourth exemplary embodiment of an antenna of a mobile terminal of the present disclosure.

FIG. 9 is a schematic structural diagram of the first tuning switch circuit of the antenna of the mobile terminal of the present disclosure.

FIG. 10 is a schematic structural diagram of the second tuning switch circuit of the antenna of the mobile terminal of the present disclosure.

FIG. 11 is a schematic structural diagram of a third tuning switch circuit of the antenna of the mobile terminal of the present disclosure.

detailed description

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

As shown in Figures 1 to 4, according to one aspect of the present disclosure, a metal rear case of a mobile terminal (especially a mobile phone) is provided, which includes a base plate 11 and a frame connected around the base plate, on which there are holes for the The metal back shell is divided into a gap between the ground terminal 10 and the antenna terminal 20, and the ground terminal 10 and the antenna terminal 20 are connected by an insulating material (not shown) filled in the gap.

In the present disclosure, by making a slit on the frame of the metal back case to separate an independent metal body as the antenna end 20, it is possible to avoid making a slit on the bottom plate 11 of the metal back case, thereby ensuring the integrity of the bottom plate 11 and making it possible to move The terminal can be improved in terms of appearance design and user experience.

In the present disclosure, the slit may be a closed annular slit or an open slit. In the former case, the antenna end 20 can be surrounded by the gap; in the latter case, the antenna end 20 is surrounded by the gap and the edge of the frame.

In the case where the slit is an open slit, the slit may include a first slit 161 and two second slits 162 located at both ends of the first slit 161, and the first slit 161 extends along the frame (that is, along the bottom plate 11 The edge of each second slit 162 is extended), and one end of each second slit 162 is connected with the first slit 161, and the other end extends to the edge of the frame. In this way, the independent metal body separated by the first slit 161 and the two second slits 162 is used as the antenna end 20 to radiate the electromagnetic wave signal, and the first slit 161 and the second slit 162 can be used to excite electromagnetic waves and widen the area covered by the antenna. frequency and bandwidth.

As shown in FIGS. 1 to 4 , in the metal rear case of the present disclosure, the frame may include a left frame 12 , a right frame 13 , an upper frame 14 and a lower frame 15 . Wherein, the left frame 12 and the right frame 13 are a pair of longer frames, the upper frame 14 and the lower frame 15 are a pair of shorter frames, and the upper frame 14 is a frame adjacent to the handset of the mobile terminal, and the lower frame 15 is a frame adjacent to the receiver. The border of the mobile terminal microphone.

In the first embodiment of the metal rear case disclosed in the present disclosure, as shown in FIG. Both ends of a slit 161 respectively extend beyond the corresponding second slit 162 .

In the second embodiment of the metal rear case of the present disclosure, as shown in FIG. 2 , the first slit 161 may be L-shaped and include a long section and a short section, wherein the long section is set on the lower frame 15 and the short section is set on the lower frame 15 . The segment is set on the left frame 12, one of the two second slits 162 is set at the position of the lower frame 15 close to the right frame 13, and the other is set at the position of the left frame 12 close to the lower frame 15, the first slit 161 Both ends of each extend beyond the corresponding second slit 162 .

In the third embodiment of the metal rear case disclosed in the present disclosure, as shown in FIG. The segment is set on the right frame 13, one of the two second slits 162 is set at the position of the lower frame 15 close to the left frame 12, and the other is set at the position of the right frame 13 close to the lower frame 15, and the first slit 161 Both ends of each extend beyond the corresponding second slit 162 .

In the fourth embodiment of the metal rear case of the present disclosure, as shown in FIG. 4 , the first slit 161 may be U-shaped and include one long section and two short sections, wherein the long section is set on the lower frame 15 , One of the two short sections is set on the left frame 12, the other is set on the right frame 13, one of the two second slits 162 is set on the left frame 12 near the lower frame 15, the other The other is set at the position of the right frame 13 close to the lower frame 15 , and the two ends of the first slit 161 respectively extend beyond the corresponding second slit 162 .

According to another aspect of the present disclosure, there is also provided a mobile terminal, which includes the above metal rear case. In order for the mobile terminal antenna of the present disclosure to achieve coverage of a wider frequency band (for example, 700-2700 MHz), the present disclosure also provides the following antenna structure.

In the first embodiment of the antenna of the present disclosure, as shown in FIG. 5 , the antenna includes an excitation source 80, the excitation source 80 is connected to the feed point S of the antenna end 20, and the first ground point G1 of the antenna end 20 passes through the first The tuning switch circuit 30 is grounded, the second ground point G2 of the antenna end 20 is grounded through the second tuning switch circuit 40 or the resonant circuit 60 , and the third ground point G3 of the antenna end 20 is grounded through the third tuning switch circuit 50 . By selecting different grounding point positions, different resonant circuits are formed, so that the frequency range that the antenna can cover is wider.

In the embodiment shown in FIG. 5 , the feed point S is located between the first ground point G1 and the third ground point G3 , and the third ground point G3 is located between the feed point S and the second ground point G2 . In other implementations not shown, the positions of the feed point S and each ground point can also be changed.

The first tuning switch circuit 30 may be formed by various appropriate components connected through various appropriate connection methods. In the embodiment shown in FIG. 9, the first tuning switch circuit 30 may include a first switch 31, a first capacitor 32 and a first inductor 33, and the static contact 310 of the first switch 31 is connected to the first ground point G1, The first movable contact 311 of the first switch 31 is an open circuit point, the second movable contact 312 of the first switch 31 is directly grounded, the third movable contact 313 of the first switch 31 is grounded through the first inductance 33, and the first switch The fourth movable contact 314 of 31 is grounded through the first capacitor 32 . By connecting the static contact 310 of the first switch 31 to different movable contacts, the impedance matching of the antenna end 20 can be adjusted, so that the antenna covers a wider frequency band and has a better effect. In other implementation manners, the first tuning switch circuit 30 may also be a combination of any two or three of an open circuit, a short circuit, a capacitive circuit, and an inductive circuit.

The second tuning switch circuit 40 may be formed by various appropriate components connected through various appropriate connection methods. In the embodiment shown in FIG. 10, the second tuning switch circuit 40 may include a variable capacitor 42, and the second ground point G2 is directly grounded through the variable capacitor 42. By adjusting the capacitance of the variable capacitor 42, the antenna end can be changed. The impedance matching of 20 makes the antenna cover a wider frequency band and the effect is better.

The third tuning switch circuit 50 may be formed by various appropriate components connected through various appropriate connection methods. In the embodiment shown in FIG. 11 , the third tuning switch circuit 50 may include a third switch 51, a third capacitor 52 and a third inductor 53, the static contact 510 of the third switch 51 is connected to the third ground point G3, The first movable contact 511 of the third switch 51 is an open circuit point, the second movable contact 512 of the third switch 51 is directly grounded, the third movable contact 513 of the third switch 51 is grounded through the third inductance 53, and the third switch 51 The fourth movable contact 514 of 51 is grounded through the third capacitor 52 . By connecting the static contact 510 of the third switch 51 to different movable contacts, the impedance matching of the antenna end 20 can be adjusted, so that the antenna covers a wider frequency band and has a better effect. In other implementation manners, the third tuning switch circuit 50 may also be a combination of any two or three of an open circuit, a short circuit, a capacitive circuit, and an inductive circuit.

In the second embodiment of the antenna of the present disclosure, as shown in FIG. 6 , the difference from the first embodiment is that the second tuning switch circuit 40 in the first embodiment is replaced with a resonant circuit 60 . Here, the resonant circuit 60 is used to adjust the resonant frequency point, and the resonant circuit 60 may be, for example, a resonant strip line with a certain length.

In the third embodiment of the antenna of the present disclosure, as shown in FIG. An adjustable matching circuit 70 is added between the feed point S of the terminal 20. The adjustable matching circuit 70 can widen the operating frequency band of the antenna by adjusting the parameters of the feed position and the feed line width distribution.

In the fourth embodiment of the antenna of the present disclosure, as shown in FIG. 8 , the difference from the third embodiment is that the second tuning switch circuit 40 in the third embodiment is replaced with a resonant circuit 60 . Adjusting the resonant frequency point through the resonant circuit 60 can also broaden the working frequency band of the antenna.

By switching the first tuning switch circuit 30, the second tuning switch circuit 40, the third tuning switch circuit 50, and the L/C value loaded by each switch, or adjusting the resonant circuit 60, or adjusting the matching circuit 70, the working frequency band of the antenna Full frequency band coverage of high frequency (for example, 2300-2700MHz), intermediate frequency (for example, 1700-2100MHz), and low frequency (for example, 700-1000MHz) can be realized without affecting its working efficiency.

Other embodiments of the disclosure will be readily apparent to those skilled in the art from consideration of the specification and practice of the disclosure. This application is intended to cover any modification, use or adaptation of the present disclosure, and these modifications, uses or adaptations follow the general principles of the present disclosure and include common knowledge or conventional technical means in the technical field not disclosed in the present disclosure . The specification and examples are to be considered exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.

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

Claims (15)

1. A metal back shell of a mobile terminal, comprising a bottom plate (11) and a frame connected around the bottom plate, the metal back shell is provided with a ground end (10) and an antenna end (20) for the metal back shell ), the ground end (10) and the antenna end (20) are connected through an insulating material filled in the gap, and it is characterized in that the gap is opened on the frame. 2. The metal rear case according to claim 1, characterized in that, the slit and the edge of the frame jointly enclose the antenna end (20). 3. The metal rear case according to claim 2, characterized in that, the slits include a first slit (161) and two second slits (162) located at both ends of the first slit (161), the first slit (161) A slit (161) extends along the frame, one end of each second slit (162) is connected to the first slit (161), and the other end extends to the edge of the frame. 4. The metal rear case according to claim 3, characterized in that, both ends of the first slit (161) respectively extend beyond the corresponding second slit (162). 5. The metal rear case according to claim 3 or 4, characterized in that, the frame includes a left frame (12), a right frame (13), an upper frame (14) and a lower frame (15), and the second frame A slit (161) is in the shape of a "one", and the two second slits (162) are both opened on the lower frame (15). 6. The metal rear case according to claim 3 or 4, characterized in that, the frame comprises a left frame (12), a right frame (13), an upper frame (14) and a lower frame (15), and the second frame A slit (161) is L-shaped, one of the two second slits (162) is set on the lower frame (15), the other is set on the left frame (12) or the right frame (13) )superior. 7. The metal rear case according to claim 3 or 4, characterized in that, the frame comprises a left frame (12), a right frame (13), an upper frame (14) and a lower frame (15), and the second frame A slit (161) is U-shaped and runs through the lower frame (15), one of the two second slits (162) is set on the left frame (12), and the other is set on the right on the border (13). 8. A mobile terminal, characterized by comprising the metal rear case according to any one of claims 1-7. 9. The mobile terminal according to claim 8, characterized in that, the mobile terminal further comprises an excitation source (80), which is connected to the feed point (S) of the antenna end (20), The first ground point (G1) of the antenna end (20) is grounded through the first tuning switch circuit (30), and the second ground point (G2) of the antenna end (20) is grounded through the second tuning switch circuit (40) Or the resonant circuit (60) is grounded, and the third ground point (G3) of the antenna end (20) is grounded through the third tuning switch circuit (50). 10. The mobile terminal according to claim 9, characterized in that, the feed point (S) is located between the first ground point (G1) and a third ground point (G3), and the third ground point (G3) is located between said feed point (S) and a second ground point (G2). 11. The mobile terminal according to claim 8, characterized in that, the mobile terminal further comprises an excitation source (80), the excitation source (80) and the feed point (S) of the antenna end (20) can be The tuning matching circuit (70) is connected, the first ground point (G1) of the antenna end (20) is grounded through the first tuning switch circuit (30), and the second ground point (G2) of the antenna end (20) is grounded through the The second tuning switch circuit (40) or resonant circuit (60) is grounded. 12. The mobile terminal according to claim 11, characterized in that the feed point (S) is located between the first ground point (G1) and the second ground point (G2). 13. The mobile terminal according to any one of claims 9-12, characterized in that, the first tuning switch circuit (30) comprises a first switch (31), a first capacitor (32) and a first inductor (33), the static contact (310) of the first switch (31) is connected to the first ground point (G1), and the first movable contact (311) of the first switch (31) is an open circuit point, the second movable contact (312) of the first switch (31) is directly grounded, and the third movable contact (313) of the first switch (31) is grounded through the first inductance (33), The fourth movable contact (314) of the first switch (31) is grounded through the first capacitor (32). 14. The mobile terminal according to any one of claims 9-12, characterized in that, the second tuning switch circuit (40) includes a variable capacitor (42), and the second ground point (G2) passes through The variable capacitor (42) is grounded. 15. The mobile terminal according to claim 9 or 10, characterized in that, the third tuning switch circuit (50) comprises a third switch (51), a third capacitor (52) and a third inductor (53), The static contact (510) of the third switch (51) is connected to the third ground point (G3), the first movable contact (511) of the third switch (51) is an open point, and the The second movable contact (512) of the third switch (51) is directly grounded, the third movable contact (513) of the third switch (51) is grounded through the third inductance (53), and the third The fourth movable contact (514) of the switch (51) is grounded through the third capacitor (52).