阅读说明：本技术 手机天线及手机 (mobile phone antenna and mobile phone ) 是由 王辉 王亚军 隋晓东 梁永明 于 2019-08-21 设计创作，主要内容包括：本发明公开了一种手机天线及手机,该手机天线包括：第一天线分支,设置在手机的边框上,且从所述边框底部的横向侧面延伸至第一纵向侧面。第二天线分支,设置在手机的边框上与所述第一天线相对布设,且从所述边框底部的横向侧面延伸至第二纵向侧面。所述第一天线分支和所述第二天线分支之间形成有一缝隙,所述第一天线分支和所述第二天线分支均为连续的导电结构。本发明提供的手机天线成本降低,且提高了通信性能。(the invention discloses a mobile phone antenna and a mobile phone, wherein the mobile phone antenna comprises: the first antenna branch is arranged on a frame of the mobile phone and extends from the transverse side face of the bottom of the frame to the first longitudinal side face. And the second antenna branch is arranged on the frame of the mobile phone, is arranged opposite to the first antenna, and extends from the transverse side surface of the bottom of the frame to the second longitudinal side surface. A gap is formed between the first antenna branch and the second antenna branch, and the first antenna branch and the second antenna branch are both continuous conductive structures. The mobile phone antenna provided by the invention has the advantages that the cost is reduced, and the communication performance is improved.)

1. A mobile phone antenna is characterized by comprising:

The first antenna branch is arranged on a frame of the mobile phone and extends from the transverse side surface of the bottom of the frame to the first longitudinal side surface;

The second antenna branch is arranged on a frame of the mobile phone, is opposite to the first antenna branch and extends from the transverse side surface of the bottom of the frame to the second longitudinal side surface;

a gap is formed between the first antenna branch and the second antenna branch, and the first antenna branch and the second antenna branch are both continuous conductive structures.

2. The handset antenna according to claim 1, wherein the first antenna branch is longer than the second antenna branch on the lateral side of the bottom of the bezel.

3. The handset antenna according to claim 2, wherein the length of the first antenna branch distributed on the lateral side of the bottom of the frame is 55% -65% of the total length of the first antenna branch and the second antenna branch distributed on the lateral side of the bottom of the frame, and the length of the second antenna branch is 35% -45%.

4. The handset antenna as claimed in claim 3, wherein the first antenna branch has a length 3/5 of the total length of the first antenna branch and the second antenna branch at the lateral side of the bottom of the bezel, and the second antenna branch has a length 2/5.

5. The handset antenna according to claim 1, wherein the first antenna branch and the second antenna branch are distributed on the lateral side of the bottom of the bezel in such a way that the portions of the lateral side of the bottom of the bezel cover the entire width of the lateral side of the bottom of the bezel.

6. The mobile phone antenna according to claim 1, wherein the first antenna branch is connected to a first tuning connection pad electrically connected to a first antenna tuning system, the second antenna branch is connected to a feed connection pad electrically connected to a feedback system, and the first tuning connection pad and the feed connection pad are disposed below a screen of the mobile phone.

7. The handset antenna of claim 6 wherein the feed connection pad is disposed proximate the slot.

8. The handset antenna of claim 6 wherein the first antenna branch is integrally formed with the first tuning tab and the second antenna branch is integrally formed with the feed point tab.

9. the handset antenna of claim 6 wherein the second antenna branch is connected to a second tuning tab electrically connected to a second antenna tuning system, the second tuning tab being disposed proximate the second longitudinal side and below the handset screen.

10. The handset antenna of claim 8 wherein the distance from the first tuning tab to the feed connection tab is 15-25 mm.

11. The handset antenna of claim 9 wherein the second tuning tab is spaced from the second longitudinal side by a distance of 6-12 mm.

12. The handset antenna according to claim 1, wherein the first antenna branch comprises a first sub-antenna, a second sub-antenna and a first tuning connection piece, the first sub-antenna and the second sub-antenna are spaced apart from each other to form a break, the first sub-antenna extends from the break to the first longitudinal side, the second sub-antenna extends from the break to the slot, and the first sub-antenna and the second antenna branch are symmetrically disposed with respect to the second sub-antenna;

The first tuning connecting sheet is connected with the first sub-antenna and the second sub-antenna at a fracture so that the first sub-antenna and the second sub-antenna form a whole.

13. The handset antenna of claim 12, wherein the first tuning tab connects the inner sides of the first and second sub-antennas, and wherein the first sub-antenna, the second sub-antenna and the first tuning tab are integrally formed.

14. The handset antenna according to claim 12, wherein the second antenna branch is connected to a feed connection pad electrically connected to the feedback system, the first tuning connection pad and the feed connection pad being disposed below the handset screen, the feed connection pad being disposed adjacent to the slot.

15. The handset antenna of claim 14 wherein the separation width of the discontinuity is substantially the same as the separation width of the slot.

16. The handset antenna according to claim 1, wherein the gap width of the slots is 0.5-1.2 mm.

17. The handset antenna according to claim 1, wherein the first antenna branch and the second antenna branch are L-shaped, and the first antenna branch and the second antenna branch are disposed face to face and are respectively connected and matched with a housing of the handset.

18. the handset antenna as claimed in claim, wherein a first coupling block is disposed at the slot of the first antenna branch, and a second coupling block is disposed at the slot of the second antenna branch.

19. A handset, comprising a body and a frame, wherein the frame is provided with a handset antenna according to any one of claims 1 to 18.

20. The handset according to claim 19, wherein the body is provided with a USB port, the USB port being located between the first tuning connection pad and the feed point connection pad of the handset antenna.

21. The handset according to claim 20, wherein the USB port is located to the left of the first tuning tab of the handset antenna, and the first antenna branch has a first opening for receiving the USB port.

22. the mobile phone of claim 21, wherein the body is provided with a speaker unit, an earphone unit and a microphone unit, and the frame is provided with a second opening, a third opening and a fourth opening for correspondingly mounting the speaker unit, the earphone unit and the microphone unit.

Technical Field

The invention relates to the field of mobile phones, in particular to a mobile phone antenna and a mobile phone.

Background

The development of mobile phones is changing day by day, and people have higher and higher aesthetic appeal on the appearance of the mobile phones. For example: the full screen and the special screen with high screen ratio gradually become fashion trends leading the public. Each terminal manufacturer strives to reduce the "forehead" and "chin" of the handset for higher screen duty, which results in smaller and smaller antenna headroom and poorer antenna environments due to the hand grip.

In addition, in the conventional technology, signals among a plurality of antenna branches of the mobile phone antenna interfere with each other, so that the coupling effect among the antenna branches is poor, the return loss is small, and the signal radiation performance is poor. How to design a mobile phone antenna with good signal radiation performance to ensure good communication performance and reduce the cost of the mobile phone antenna is a difficult problem to be overcome in the field of mobile terminal antenna design.

Disclosure of Invention

The invention provides a mobile phone antenna and a mobile phone, aiming at solving the problems of poor clearance environment, poor signal radiation performance and high cost of the mobile phone antenna in the prior art.

The technical scheme adopted by the invention is as follows:

A handset antenna comprising: the first antenna branch is arranged on a frame of the mobile phone and extends from the transverse side surface of the bottom of the frame to the first longitudinal side surface; the second antenna branch is arranged on a frame of the mobile phone, is arranged opposite to the first antenna, and extends from the transverse side surface of the bottom of the frame to the second longitudinal side surface; a gap is formed between the first antenna branch and the second antenna branch, and the first antenna branch and the second antenna branch are both continuous conductive structures.

Optionally, the length of the first antenna branch distributed on the lateral side of the bottom of the frame is longer than the length of the second antenna branch distributed on the lateral side of the bottom of the frame.

Optionally, the length of the first antenna branch distributed on the lateral side of the bottom of the frame is 55% -65% of the total length of the first antenna branch and the second antenna branch distributed on the lateral side of the bottom of the frame, and the length of the second antenna branch is 35% -45%.

Optionally, the length of the first antenna branch distributed on the lateral side of the bottom of the bezel is 3/5 of the total length of the first antenna branch and the second antenna branch distributed on the lateral side of the bottom of the bezel, and the length of the second antenna branch is 2/5.

Optionally, the first antenna branch and the second antenna branch are distributed on the lateral side of the bottom of the frame, and the portion of the lateral side of the bottom of the frame covers the entire width of the lateral side of the bottom of the frame.

Optionally, the first antenna branch is connected to a first tuning connection piece electrically connected to the first antenna tuning system, the second antenna branch is connected to a feed point connection piece electrically connected to the feedback system, and the first tuning connection piece and the feed point connection piece are disposed below the mobile phone screen.

Optionally, the feed point connecting piece is arranged close to the gap.

Optionally, the first antenna branch and the first tuning connection piece are integrally formed, and the second antenna branch and the feed point connection piece are integrally formed.

optionally, the second antenna branch is connected to a second tuning connection piece electrically connected to a second antenna tuning system, and the second tuning connection piece is disposed near the second longitudinal side and below the mobile phone screen.

Optionally, the distance from the first tuning connection piece to the feed point connection piece is 15-25 mm.

Optionally, the second tuning tab is spaced 6-12mm from the second longitudinal side.

Optionally, the first antenna branch includes a first sub-antenna, a second sub-antenna and a first tuning connecting piece, the first sub-antenna and the second sub-antenna are spaced apart from each other to form a break, the first sub-antenna extends from the break to a first longitudinal side surface, the second sub-antenna extends from the break to the slot, and the first sub-antenna and the second sub-antenna branch are symmetrically disposed with respect to the second sub-antenna;

the first tuning connecting sheet is connected with the first sub-antenna and the second sub-antenna at a fracture so that the first sub-antenna and the second sub-antenna form a whole.

Optionally, the first tuning connecting piece is connected to inner side surfaces of the first sub-antenna and the second sub-antenna, and the first sub-antenna, the second sub-antenna and the first tuning connecting piece are integrally formed.

Optionally, the second antenna branch is connected with a feed point connecting piece electrically connected with the feedback system, the first tuning connecting piece and the feed point connecting piece are arranged below the mobile phone screen, and the feed point connecting piece is arranged close to the gap.

Optionally, the spacing width of the fracture is consistent with the spacing width of the gap.

Optionally, the gap width of the gap is 0.5-1.2 mm.

Optionally, the first antenna branch and the second antenna branch are L-shaped, and the first antenna branch and the second antenna branch are arranged face to face and are respectively connected and matched with a housing of the mobile phone.

Optionally, a first coupling block is disposed at a gap of the first antenna branch, and a second coupling block is disposed at a gap of the second antenna branch.

A mobile phone comprises a phone body and a frame, wherein the mobile phone antenna is arranged on the frame.

Optionally, a USB interface is disposed on the body, and the USB interface is located between the first tuning connection piece and the feed point connection piece of the mobile phone antenna.

Optionally, the USB interface is located on the left side of the first tuning connection piece of the mobile phone antenna, and the first antenna branch is provided with a first opening for installing the USB interface.

Optionally, a speaker unit, an earphone unit and a microphone unit are arranged on the body, and a second opening, a third opening and a fourth opening are correspondingly formed in the frame, and the speaker unit, the earphone unit and the microphone unit are installed on the frame.

According to the technical scheme, the invention has at least the following advantages and positive effects:

The mobile phone antenna is arranged on the mobile phone frame, so that the clearance of the antenna is reduced, and the 'chin' of the mobile phone is reduced. The first antenna branch and the second antenna branch are respectively of a continuous conductive structure, and only one gap is arranged between the first antenna branch and the second antenna branch, so that the electromagnetic coupling performance between the first antenna branch and the second antenna branch is better, a stronger radio-frequency electromagnetic field can be excited by the mobile phone antenna, and the communication performance of the mobile phone antenna can be improved.

In addition, the interval width of the gap between the first antenna branch and the second antenna branch can be 0.5-1.2mm, so that better communication performance can be achieved, and especially when the gap is 0.8-1.2 mm (for example, 1 mm), the requirement on the processing technology is reduced, so that the communication performance of the mobile phone antenna is improved, and the manufacturing cost is reduced.

In addition, the mobile phone antenna only needs to be provided with 2 tuning systems, so that the circuit structure is simplified, and the manufacturing cost is further reduced.

In addition, the invention can realize better free space performance in a smaller clearance, the left-hand and right-hand holding performance is balanced, and the user experience is improved.

In addition, the antenna is a pure metal frame, auxiliary wiring such as FPC (Flexible Printed Circuit) and LDS (Laser-Direct-structuring) is not needed, the number of used connecting devices is small, and the firmness and stability of the antenna are improved.

Drawings

FIG. 1 is a schematic diagram of a handset configuration incorporating the handset antenna of the present invention;

FIG. 2 is a schematic diagram of an antenna structure of a mobile phone according to an embodiment of the present invention;

FIG. 3 is a bottom view of the handset antenna structure of FIG. 2;

FIG. 4 is a side view of the handset construction of FIG. 1;

FIG. 5 is a current distribution diagram of the surface of the antenna of the handset of FIG. 2 in a low frequency state;

Fig. 6 is a current distribution diagram of the surface of the antenna of the mobile phone in fig. 2 in an intermediate frequency state;

Fig. 7 is a current distribution diagram of the surface of the antenna of the handset of fig. 2 at another intermediate frequency;

FIG. 8 is a current distribution diagram of the surface of the antenna of the handset shown in FIG. 2 in a high frequency state;

fig. 9 is a return loss diagram of the handset antenna of fig. 2 in an intermediate frequency state;

fig. 10 is a return loss diagram of the handset antenna of fig. 2 in an early high frequency state.

The reference numerals are explained below:

1. A mobile phone; 11. a first longitudinal side; 12. a second longitudinal side; 13. a lateral side of the frame bottom; 14. the lateral side of the top of the frame; 2. a mobile phone antenna; 21. a first antenna branch; 211. a first opening; 212. a first tuning connection pad; 213. breaking off; 214. a second opening; 215. a first sub-antenna; 216. a second sub-antenna; 22. a second antenna branch; 221. a feed point connecting sheet; 222. a second tuning connection pad; 223. a third opening; 224. a fourth opening; 23. a gap; 24. a first antenna tuning system; 25. a second antenna tuning system; 26. a USB interface; 27. a power feeding system.

Detailed Description

Exemplary embodiments that embody features and advantages of the invention are described in detail below in the specification. It is to be understood that the invention is capable of other embodiments and that various changes in form and details may be made therein without departing from the scope of the invention and the description and drawings are to be regarded as illustrative in nature and not as restrictive.

Referring to fig. 1, the present invention provides a mobile phone 1.

The mobile phone 1 includes a mobile phone screen (not shown), a mobile phone back case (not shown), and a mobile phone frame. The mobile phone frame is arranged around the mobile phone rear shell, the mobile phone frame and the mobile phone rear shell form an accommodating cavity, and the mobile phone screen is arranged in the accommodating cavity. The mobile phone frame comprises a transverse side surface 14 positioned at the top of the frame, a transverse side surface 13 positioned at the bottom of the frame, and a first longitudinal side surface 11 and a second longitudinal side surface 12 which are respectively positioned at the left side and the right side of the frame. The mobile phone antenna 2 is disposed on the transverse side 13, the first longitudinal side 11 and the second longitudinal side 12 of the bottom of the frame, and the mobile phone antenna 2 will be described in detail below.

referring to fig. 2 and 3, the mobile phone antenna 2 includes a first antenna branch 21 and a second antenna branch 22, the first antenna branch 21 and the second antenna branch 22 are disposed oppositely along a frame of the mobile phone, and a gap 23 is disposed between the first antenna branch 21 and the second antenna branch 22. The first antenna branch 21 and the second antenna branch 22 are both continuous conductive structures. Here, continuous means maintaining continuity of current conduction. The continuous conductive structure means: when the current is switched on, the conductive structure can keep continuous electric conduction without interruption, the electric conduction is equivalent to a continuous lead, and the continuous conductive structure can be a continuous whole metal strip or metal sheet or a structure consisting of a broken metal strip or metal sheet and a metal connecting sheet connected at the broken part in physical structure.

The first antenna branch 21 extends from the lateral side 13 of the frame bottom to the first longitudinal side 11, the first antenna branch 21 being substantially L-shaped. One end of the first antenna branch 21 close to the second antenna branch 22 is a free end, and the other end is connected with a metal frame of a mobile phone frame. In particular, the first antenna branch 21 includes a first sub-antenna 215, a second sub-antenna 216, and a first tuning connection tab 212. The first sub-antenna 215 and the second sub-antenna 216 are spaced apart from each other to form a break 213.

The first sub-antenna 215 extends from the break 213 to the first longitudinal side 11. The portions of the first sub-antennas 215 distributed at the lateral side 13 of the bezel bottom cover the entire width of the lateral side 13 of the bezel bottom. The length D1 of the first sub-antenna 215 distributed on the first longitudinal side 11 is 5-20mm (see fig. 2 and 4), and the portion of the first sub-antenna 215 distributed on the first longitudinal side 11 covers the whole first longitudinal side 11. The lateral side 13 of the bottom of the bezel, where the first sub-antenna 215 is located, is provided with a second aperture 214. The second opening 214 is used for transmitting the sound of the speaker from the mobile phone, and the second opening 214 is a plurality of small holes arranged in parallel.

The second sub-antennas 216 extend from the break 213 to the slot 23, and the portions of the second sub-antennas 216 distributed on the lateral side 13 of the bezel bottom cover the entire width of the lateral side 13 of the bezel bottom. The second sub-antenna 216 is provided with a first opening 211, the first opening 211 is used for installing the USB interface 26, the first opening 211 is located at the center of the second sub-antenna 216, and the shape of the first opening 211 is matched with the shape of the USB interface 26.

In an embodiment, a first coupling block is disposed at the slot 23 of the second sub-antenna 216, the first coupling block and the second sub-antenna 216 are integrally formed, the first coupling block has a first coupling surface, the first coupling surface is a plane, and the first coupling surface is flush with an end surface of the first sub-antenna 216 adjacent to the slot 23.

The first tuning connection 212 is positioned at the inner side of the fracture 213 and below the screen of the mobile phone, and the transverse distance D2 between the first tuning connection 212 and the feed point connection 221 is 15-25 mm. The first tuning connection tab 212 connects the first sub-antenna 215 and the second sub-antenna 216 at the break 213, integrating the first sub-antenna 215 and the second sub-antenna 216. The first sub-antenna 215, the second sub-antenna 216, and the first tuning connection tab 212 may be integrally formed. The first sub-antenna 215, the second sub-antenna 216 and the first tuning connection pad 213 are structurally simple. In other embodiments, the first sub-antenna 215, the second sub-antenna 216, and the first tuning connection pad 212 may be connected by soldering, or the first sub-antenna 215, the second sub-antenna 216, and the first tuning connection pad 212 may be connected by conductive wires. Compared with the traditional mobile phone antenna with two slots, the first tuning connecting piece 212 connects the first sub-antenna 215 and the second sub-antenna into a whole, so that the first sub-antenna 215 and the second sub-antenna 216 form a continuous conductive structure, the conductive performance of the first antenna branch 21 is improved, the electromagnetic coupling performance of the first antenna branch 21 and the second antenna branch 22 is improved, the mobile phone antenna 2 excites a stronger radio frequency electromagnetic field, and the communication performance of the mobile phone antenna 2 is improved. The first tuning connection piece 212 is subjected to laser etching treatment, so that the electric conductivity and the oxidation resistance of the first tuning connection piece are improved.

The first antenna branch 21 is electrically connected to the first antenna tuning system 24 by a first tuning connection tab 212. The first antenna tuning system 24 is provided with a first switch located between the first opening 211 and the second opening 214 to ensure the electromagnetic coupling performance of the first antenna branch 21 and the second antenna branch 22. The first switch is used to control the on/off of the circuit between the first antenna tuning system 24 and the first antenna branch 21. The first antenna tuning system 24 is located above the first antenna branch 21 and below the screen of the handset 1. The first antenna tuning system 24 is an impedance matching network connecting the transmitter/receiver and the first antenna branch 21 for adjusting the impedance matching of the first antenna branch 21 so that the handset antenna 2 can have a larger radiated power at different frequencies.

The second antenna branch 22 extends from the lateral side 13 to the second longitudinal side 12 of the frame bottom, the second antenna branch 22 being substantially L-shaped. Specifically, a portion of the second antenna branch 22 is disposed on a portion of the lateral side 13 of the bezel bottom adjacent to the second longitudinal side 12, and the portion of the second antenna branch 22 distributed on the lateral side 13 of the bezel bottom covers the entire width of the lateral side 13 of the bezel bottom. The other part of the second antenna branch 21 is disposed at the lower part of the second longitudinal side 12, and the length of the second antenna branch 22 distributed on the second longitudinal side 12 is equal to the length of the first sub-antenna 215 distributed on the first longitudinal side 11, so that the part of the second antenna branch 22 distributed on the second longitudinal side 12 and the part of the first antenna branch 21 distributed on the first longitudinal side 11 are symmetrical with respect to the center line d of the mobile phone 1, thereby achieving the effect of symmetry. The portion of the second antenna branch 21 distributed at the second longitudinal side 12 covers the entire width of the second longitudinal side 12. The part of the second antenna branch 22 provided at the lateral side 13 of the bottom of the frame is integrally connected to the part provided at the second longitudinal side 12.

In an embodiment, a second coupling block is disposed at the slot 23 of the second antenna branch 22, and the second coupling block is integrally formed with the second antenna branch 22. The second coupling block has a second coupling surface, which is planar and flush with the end surface of the second antenna branch 22 adjacent to the slot 23. The second coupling surface is arranged in a face-to-face manner with the first coupling surface, so that the area for electromagnetic coupling between the first antenna branch 21 and the second antenna branch 22 is increased, and the electromagnetic coupling effect of the first antenna branch 21 and the second antenna branch 22 is enhanced.

The lateral side 13 of the frame bottom where the second antenna branch 22 is located is provided with a third opening 223 and a fourth opening 224. The third opening 223 is used for an earphone jack, and the shape of the third opening 223 is circular and is matched with that of an earphone connector; the fourth opening 224 is used for the microphone to acquire external sound signals, and the fourth opening 224 is a round hole.

A feed connection pad 221 is disposed on the lateral side 13 of the bottom of the frame where the second antenna branch 22 is located, and the feed connection pad 221 is located near the slot 23 to enhance the electromagnetic coupling performance between the second antenna branch 22 and the first antenna branch 21. The feed point connecting piece 221 and the second antenna branch 22 may be integrally formed, and the feed point connecting piece 221 is processed by laser etching to increase its conductive performance and oxidation resistance. In further embodiments, the feed connection pad 221 is connected to the second antenna branch 22 by means of soldering, or the feed connection pad 221 is connected to the second antenna branch 22 by means of a wire. The feed point connection piece 221 is close to the slit 23, and the feed point connection piece 221 is located below the screen of the mobile phone 1. The second antenna branch 22 is electrically connected to a feeding system 27 through a feeding point connecting piece 221, the feeding system 27 is located above the second antenna branch 22 and adjacent to the slot 23 and below the screen of the mobile phone 1, and the feeding system 27 is used for supplying electric energy to the mobile phone antenna 2.

The second tuning connection piece 222 is disposed on the lateral side 13 of the frame bottom where the second antenna branch 22 is located, and the second tuning connection piece 222 and the second antenna branch 22 may be integrally formed, so as to simplify the structure. The second tuning connection piece 222 is subjected to laser etching treatment to increase the conductivity and the oxidation resistance. In other embodiments, the second tuning tab 222 is connected to the second antenna branch 22 by welding or the second tuning tab 222 is connected to the second antenna branch 22 by a wire. The second tuning tab 222 is located below the screen of the handset and the lateral distance D3 from the second tuning tab 222 to the second longitudinal side 12 is 6-12 mm.

The second antenna branch 22 is electrically connected to the second antenna tuning system 25 by a second tuning connection tab 222. The second antenna tuning system 25 is provided with a second switch, which is located between the third opening 223/the fourth opening 224 and the second longitudinal side 12, to ensure that the second switch is far from the feed connection pad, and to ensure the electromagnetic coupling performance of the second antenna branch 22 and the first antenna branch 21. The second switch is used to switch the circuit between the second antenna tuning system 25 and the second antenna branch 22. The second antenna tuning system 25 is located above the second antenna branch 22 and below the screen of the handset 1. The second antenna tuning system 25 is an impedance matching network connecting the transmitter/receiver and the second antenna branch 22 for adjusting the impedance matching of the second antenna branch 22 so that the handset antenna 2 can have a larger radiated power at different frequencies.

The operation of the first antenna tuning system 24 and the second antenna tuning system 25 is further explained below.

When the signal transmitted or received by the mobile phone antenna is a low-frequency signal, the second antenna tuning system 25 is in a closed state, and the first antenna tuning system 24 is connected with an inductor, wherein the preferred value of the inductor is 5.6 nH-22 nH. Referring to fig. 5, the current is mainly concentrated on the first antenna branch 21 (in fig. 5-8, the black dots are more dense, which means that the current is more concentrated, and the slot 23 at the side of the first antenna branch 21 radiates the main energy. The mode realizes the transmission or the reception of low-frequency signals, and has good hand-holding performance, namely the free space efficiency can reach-10 dB, the right hand-holding efficiency can reach-12 dB, and the left hand-holding efficiency can reach-11 dB.

When the signal transmitted or received by the mobile phone antenna is an intermediate frequency signal, the second antenna tuning system 25 is in a closed state, the first antenna tuning system 24 is connected with a capacitor, and the preferred value of the capacitor is 0.8 pF-5 pF. Referring to fig. 6, at this time, the current is mainly concentrated on the second antenna branch 22 (at this time, the dense black dots are distributed on the second antenna branch), and the slot 23 on the side of the second antenna branch 22 radiates the main energy. The mode realizes the transmission or the reception of intermediate frequency signals, and has good hand-holding performance, namely the free space efficiency can reach-5 dB, the right hand-holding efficiency can reach-10 dB, and the left hand-holding efficiency can reach-11 dB.

When the signal transmitted or received by the mobile phone antenna is another intermediate frequency signal, the second antenna tuning system 25 is short-circuited, the first antenna tuning system 24 is connected with a capacitor, and the optimal value of the capacitor is 0.8 pF-5 pF. Referring to fig. 7, at this time, the current is mainly concentrated at the first antenna branch 21 and the USB (at this time, dense black dots are distributed at the gaps of the first antenna branch), the gap 23 on the side of the first antenna branch 21 radiates the main energy, and in this mode, the free space efficiency can reach-5 dB, the right-hand holding efficiency can reach-10 dB, and the left-hand holding efficiency can reach-11 dB.

When the signal transmitted or received by the mobile phone antenna is a high-frequency signal, the second antenna tuning system 25 is in a closed state, and the first antenna tuning system 24 is in a closed state. Referring to fig. 8, at this time, the current is mainly concentrated at the USB (at this time, there are dense black dots distributed at the USB interface), and the gap 23 formed by the USB and the metal frame radiates the main energy. The mode realizes the transmission or the reception of another intermediate frequency signal, and has good hand-holding performance, namely the free space efficiency can reach-5 dB, the right hand-holding efficiency can reach-10 dB, and the left hand-holding efficiency can reach-10 dB.

Further, the length of the first antenna branch 21 distributed on the lateral side 13 of the bottom of the frame is greater than the length of the second antenna branch 22 distributed on the lateral side 13 of the bottom of the frame, and the first antenna branch 21 and the second antenna branch 22 are asymmetrically distributed with respect to the slot 23. In one embodiment, the length of the first antenna branch 21 distributed on the lateral side 13 of the bottom of the frame is 55% -65% of the total length of the first antenna branch 21 and the second antenna branch 22 distributed on the lateral side 13 of the bottom of the frame, and correspondingly, the length of the second antenna branch 22 distributed on the lateral side 13 of the bottom of the frame is 45% -35% of the total length of the first antenna branch 21 and the second antenna branch 22 distributed on the lateral side 13 of the bottom of the frame. In a preferred embodiment, the length of the first antenna branch 21 distributed on the lateral side 13 of the bottom of the bezel is 3/5 of the total length of the first antenna branch 21 and the second antenna branch 22 distributed on the lateral side 13 of the bottom of the bezel, and the length of the second antenna branch 22 distributed on the lateral side 13 of the bottom of the bezel is 2/5 of the total length of the first antenna branch 21 and the second antenna branch 22 distributed on the lateral side 13 of the bottom of the bezel. Compared with the traditional technology, when the antenna branches are symmetrically distributed, the electromagnetic coupling effect among the antenna branches is poor. The first antenna branch 21 and the second antenna branch 22 of the present invention are asymmetrically distributed, and the first sub-antenna 215 and the second sub-antenna 216 in the first antenna branch 21 are connected to form a continuous conductive structure through the first tuning connection pad 212, so that only one slot 23 is disposed between the whole first antenna branch 21 and the whole second antenna branch 22. The effect of electromagnetic coupling between the first antenna branch 21 and the second antenna branch 22 is enhanced.

Further, the first antenna branch 21 forms a gap 23 between the lateral side 13 of the frame bottom and the second antenna branch 22 at the lateral side 13 of the frame bottom. The slot 23 is used to excite a radio frequency electromagnetic field and radiate electromagnetic waves into space. Specifically, the slot 23 is formed by the facing of the end surface of the first antenna branch 21 close to the slot 23 on the lateral side 13 of the bottom of the frame and the end surface of the second antenna branch 22 close to the slot 23 on the lateral side 13 of the bottom of the frame. The gap width of the slit 23 is 0.5-1.2 mm. In one embodiment, the width of the gap 23 is 1 ± 0.05 mm. In the conventional technology, a plurality of antenna branches of an antenna on a mobile phone frame are far away from each other, the antenna branches are of a discontinuous conductive structure, a plurality of gaps are arranged between the branches, the electromagnetic coupling performance between the antenna branches is poor, and the gaps with narrow intervals need to be arranged. According to the invention, the first sub-antenna 215 and the second sub-antenna 216 are connected into a continuous conductive structure through the first tuning connecting piece 212, so that a gap 23 can be directly formed between the first antenna branch 21 and the second antenna branch 22, the electromagnetic coupling performance between the first antenna branch 21 and the second antenna branch 22 is enhanced, the radio frequency electromagnetic field radiated by the mobile phone antenna 2 is enhanced, and the communication performance of the mobile phone antenna 2 is improved. Moreover, the interval width of the gap 23 can be 0.5-1.2mm, especially 0.8-1.2 mm (such as 1 + -0.05 mm), the requirement for the manufacturing process is reduced, and the manufacturing cost is saved.

The fractures 213 and the slots 23 are symmetrically distributed on two sides of the first opening 211, the spacing width of the fractures 213 is consistent with the spacing width of the slots 23, and the first sub-antenna 215 and the second antenna branch 22 are symmetrically distributed with respect to the first opening 211, that is, the first sub-antenna 215 and the second antenna branch 22 are symmetrically distributed with respect to the second sub-antenna 216, so that the lateral side surface of the bottom of the mobile phone frame is symmetrical with respect to the center line d of the mobile phone 1, and the mobile phone frame is more attractive.

it should be noted that the first longitudinal side surface 11 may be a left side surface of the frame, and in this case, the second longitudinal side surface 12 is a right side surface of the frame. The first longitudinal side 11 may also be the right side of the frame, in which case the second longitudinal side 12 is the left side of the frame. When the mobile phone antenna 2 is actually designed, the relative positions of the first antenna branch 21 and the second antenna branch 22 on the frame of the mobile phone 1 are arranged according to the relationship of each element inside the mobile phone 1.

the following is a comparative analysis of the technical effects of the return loss generated by the mobile phone antenna adopting the technical scheme of the invention and the return loss generated by the mobile phone antenna adopting the traditional technical scheme.

Return loss refers to the reflection of a cable link due to impedance mismatch. The more reasonable the impedance matching in the circuit, the less power is reflected and the more power is output. The return loss can be measured by RL, which is calculated by the formula RL ═ 10lg (Pref/Pin), where: pref is the reflected power and Pin is the input power. It can be seen that RL is a negative value, the smaller RL, the smaller return loss, the smaller reflected power, and the larger output power, the stronger electromagnetic wave radiated to the space when the input power is constant.

Referring to fig. 9, when the signal is in the intermediate frequency mode (range from 1.5GHz to 2.7 GHz), the distribution of return loss values on the antenna of the mobile phone in the conventional technology is as follows: in the range of 1.5GHz to 1.9GHz, the range is gradually reduced from-1.5 dB to-5 dB; in the range of 1.9GHz to 2.2GHz, the signal gradually rises from-5 dB to-2.8 dB; in the range of 2.2GHz to 2.7GHz, the signal level is maintained at about-2.8 dB.

The distribution situation of return loss values on the mobile phone antenna 2 of the invention is as follows: in the range of 1.5GHz to 1.9GHz, the range is gradually reduced from-1.5 dB to-15 dB; gradually increasing from-15 dB to-3.3 dB in the range of 1.9GHz to 2.2 GHz; in the range of 2.2GHz to 2.5GHz, the value is gradually reduced from-3.2 dB to-15 dB; in the range of 2.5GHz to 2.7GHz, the gradual rise from-15 dB to-2 dB. Comparing the segmented data, it can be obviously obtained that, in the intermediate frequency mode, the return loss (shown as a dotted line in the figure) of the mobile phone antenna 2 of the present invention is obviously lower than the return loss (shown as a solid line in the figure) of the mobile phone antenna in the conventional technology, and by using the technical scheme of the present invention, the return loss of the mobile phone antenna 2 is reduced, the radiation power of the mobile phone antenna 2 is improved, and the communication performance of the mobile phone 1 is improved.

referring to fig. 10, when the signal is in the high-frequency mode (in the range from 2.3GHz to 2.8 GHz), the distribution of the return loss values on the antenna of the mobile phone in the conventional technology is as follows: in the range of 2.3GHz to 2.8GHz, the range gradually decreases from-1.8 dB to-5.2 dB.

the distribution situation of return loss values on the mobile phone antenna 2 of the invention is as follows: in the range of 1.8GHz to 2.5GHz, the signal gradually rises from-1.8 dB to-2.4 dB; in the range of 2.5GHz to 2.7GHz, the range is gradually reduced from-2.4 dB to-14 dB; in the range of 2.7GHz to 2.8GHz, the gradual rise from-14 dB to-5.2 dB. Comparing the above segmented data, it can be clearly seen that, in the high-frequency mode, the return loss of the mobile phone antenna 2 of the present invention (shown as a dotted line in the figure) is significantly lower than that of the mobile phone antenna 2 adopting the conventional technology (shown as a solid line in the figure). By using the technical scheme of the invention, the return loss of the mobile phone antenna 2 is reduced, the radiation power of the mobile phone antenna 2 is improved, and the communication performance of the mobile phone 1 is improved.

In the above embodiment, the first antenna branch includes the first sub-antenna 215, the second sub-antenna 216, and the first tuning connection tab 212 connects the first sub-antenna 215 and the second sub-antenna 216 to form one continuous whole. In another embodiment, the first antenna branch itself may be a continuous whole, for example a continuous piece or strip of metal, which extends continuously from the slot to the first longitudinal side. Therefore, only one gap is formed between the first antenna branch and the second antenna branch, and the deterioration of the electromagnetic coupling effect between the branches and the mutual interference of signals caused by a plurality of gaps are avoided.

In the above described embodiment, the first antenna branch is longer than the second antenna branch, in another embodiment, the first antenna branch and the second antenna branch may also be equal in length, in which case the slot between the first antenna branch and the second antenna branch is located in the center of the bottom lateral side, and the first antenna branch and the second antenna branch are symmetrically arranged about the slot. Meanwhile, the USB interface is arranged on the left side or the right side of the mobile phone, for example, the USB interface is arranged at a position close to the first longitudinal side face, so that the USB interface is prevented from being arranged at a gap in the middle, and the influence of the USB interface on signal transmission is reduced.

The invention has at least the following beneficial effects:

First, the antenna branches are far apart from each other and a plurality of slots are formed between the branches, as compared to the conventional art. The mobile phone antenna is arranged on the mobile phone frame, the first antenna branch and the second antenna branch are closer to each other and only one gap is arranged, so that the antenna clearance is reduced, and the 'chin' of the mobile phone is reduced. And the coupling performance between the first antenna branch and the second antenna branch is better, which is beneficial to the mobile phone antenna to excite stronger radio frequency electromagnetic field and improve the communication performance of the mobile phone antenna.

Second, the spacing width of each slot of the mobile phone antenna in the conventional technology must reach about 0.7mm with high precision, which requires high manufacturing cost. The gap width of the gap between the first antenna branch and the second antenna branch can be 0.5-1.2mm, and better communication performance can be achieved, and especially when the gap is 0.8-1.2 mm (for example, 1 mm), the requirement on the processing technology is reduced, so that the communication performance of the mobile phone antenna is improved, and the manufacturing cost is reduced.

Third, the mobile phone antenna in the conventional technology needs to be provided with 3 or 4 tuning systems, and the mobile phone antenna in the application only needs to be provided with 2 tuning systems, so that the circuit structure is simplified, and the manufacturing cost is further reduced.

Fourthly, the invention can realize better free space performance in smaller clearance, the left-hand and right-hand holding performance is balanced, and the user experience is improved.

Fifthly, the antenna of the invention is a pure metal frame, and has no auxiliary wiring such as FPC (Flexible Printed Circuit), LDS (Laser-Direct-structuring) and the like, and has fewer connecting devices, thereby improving the firmness and stability of the antenna.

While the present invention has been described with reference to several exemplary embodiments, it is understood that the terminology used is intended to be in the nature of words of description and illustration, rather than of limitation. As the present invention may be embodied in several forms without departing from the spirit or essential characteristics thereof, it should also be understood that the above-described embodiments are not limited by any of the details of the foregoing description, but rather should be construed broadly within its spirit and scope as defined in the appended claims, and therefore all changes and modifications that fall within the meets and bounds of the claims, or equivalences of such meets and bounds are therefore intended to be embraced by the appended claims.