CN201294266Y - Radiation piece for built-in monopole double-frequency mobile phone antenna, mobile phone antenna and antenna die set - Google Patents

Abstract

The utility model discloses a built-in single-pole dual-frequency mobile phone antenna radiator, a mobile phone antenna and an antenna module, which comprise a feeding point and two radiators. The first radiator is in the shape of a long and narrow sheet; one end of the second radiator is connected to one end of the first radiator and surrounds the first radiator, and there is a gap between the free end and the first connecting part to form a first slit, which is parallel to the first radiator The upper part of the upper edge forms a second slit with the upper edge, and the lower part parallel to the lower edge of the first radiator forms a third slit with the lower edge; the upper part is bent backward, and the upper part is away from the second radiating body. The free end part of the body is narrower than other parts of the second radiator; the feed point is connected to the first radiator and the second radiator, attached to the lower surface of the antenna bracket, and connected to the RF signal feed point on the main board of the mobile phone, An inductor is connected between the RF signal feeding point and the DC ground on the main board of the mobile phone. The utility model can reduce the space actually occupied by the antenna while maintaining the efficiency of the antenna.

Description

Built-in single-pole dual-frequency mobile phone antenna radiator, mobile phone antenna and antenna module

technical field

The utility model relates to mobile phone antenna technology, in particular to a built-in single-pole dual-frequency mobile phone antenna radiator, a mobile phone antenna and an antenna module.

Background technique

Currently, there are mainly two types of built-in mobile phone antennas: a planar shape (PIFA) antenna and a monopole (Monopole) antenna. With the gradual development of mobile phones in the direction of miniaturization and ultra-thinning in recent years, the space for mobile phone antennas has also been compressed smaller and smaller. The space required by the PIFA dual-band antenna is not less than 600×7mm ³ , and the volume required by the Monopole antenna is much smaller than that required by the PIFA dual-band antenna. However, metal parts cannot be placed within 7mm from the Monopole antenna body. , otherwise it will affect the antenna efficiency, this space is called the clearance area of the Monopole antenna. Since the Monopole antenna requires a large clearance area, the actual space occupied by the Monopole antenna is relatively large, which limits the miniaturization of mobile phones.

Utility model content

In view of this, the utility model provides a built-in monopole dual-frequency mobile phone antenna radiator, a mobile phone antenna and an antenna module, which can reduce the space actually occupied by the Monopole antenna while ensuring the efficiency of the mobile phone antenna.

The utility model provides a built-in single-pole dual-frequency mobile phone antenna radiator, which includes a first radiator, a second radiator and a feed point;

The first radiator is in the shape of a long and narrow sheet;

One end of the first radiator is perpendicular to the upper edge of the first radiator and sequentially extends upward in the plane where the first radiator is located to form a first connection part and a second connection part, and the feeding point is directly connected to the second connection part;

The second radiator is connected to the end of the first radiator that extends out of the first connecting portion, extends downward in the plane where the first radiator is located along a direction perpendicular to the lower edge of the first radiator, and then extends a first segment of the radiation surface, and then In this plane, turn a right angle to the direction of the free end of the first radiating body, extend a second section of radiating surface parallel to the lower edge of the first radiating body, then turn upwards at a right angle in this plane and extend until it crosses the first radiating body. The free end of the radiation body forms the third section of radiation surface, and then turns away from the first radiation body at a right angle in the direction of extending the free end, extends the fourth section of radiation surface in this plane, then turns upward at a right angle, and then turns away from the first radiation surface at a right angle. The direction in which the radiator extends out of the free end is turned at a right angle, and a fifth section of the radiation surface is extended in this plane. There is a gap between the free end of the fifth section of the radiation surface and the first connecting part, forming the first slit, and the fifth section of the radiation surface. The first radiating surface and the upper edge of the first radiator form a second slit, the second radiating surface and the lower edge of the first radiating body form a third slit, and the width of the fourth radiating surface is smaller than that of the second radiator The width of the other sections.

A single-pole dual-frequency mobile phone antenna provided by the utility model includes a first radiator, a second radiator and a feeding point;

The first radiator is in the shape of a long and narrow sheet;

One end of the first radiator is perpendicular to the upper edge of the first radiator and sequentially extends upward in the plane where the first radiator is located to form a first connection part and a second connection part, and the feeding point is directly connected to the second connection part;

The second radiator is connected to the end of the first radiator that extends out of the first connecting portion, extends downward in the plane where the first radiator is located along a direction perpendicular to the lower edge of the first radiator, and then extends a first segment of the radiation surface, and then In this plane, turn a right angle to the direction of the free end of the first radiating body, extend a second section of radiating surface parallel to the lower edge of the first radiating body, then turn upwards at a right angle in this plane and extend until it crosses the first radiating body. The free end of the radiation body forms the third section of radiation surface, and then turns away from the first radiation body at a right angle in the direction of extending the free end, extends the fourth section of radiation surface in this plane, then turns upward at a right angle, and then turns away from the first radiation surface at a right angle. The direction in which the radiator extends out of the free end is turned at a right angle, and a fifth section of the radiation surface is extended in this plane. There is a gap between the free end of the fifth section of the radiation surface and the first connecting part, forming the first slit, and the fifth section of the radiation surface. The first radiating surface and the upper edge of the first radiator form a second slit, the second radiating surface and the lower edge of the first radiating body form a third slit, and the width of the fourth radiating surface is smaller than that of the second radiator the width of other parts;

The fourth radiating surface is attached to the chamfer where the front surface of the antenna bracket intersects with the upper surface, and the fifth radiating surface is folded backward;

After the first connecting part is bent backwards and the second connecting part is bent downwards and forwards, the feeding point is connected to the RF signal feeding point on the main board of the mobile phone, wherein the RF signal feeding point and the An inductor is connected between the DC ground on the main board of the mobile phone.

The utility model provides a single-pole dual-frequency mobile phone antenna module, which includes an antenna body and an antenna bracket;

The antenna body has a first radiator in the shape of a long and narrow sheet, a second radiator connected to one end of the first radiator, and a feeding point; the end connected to the first radiator and the second radiator is perpendicular to The upper edge of the first radiator extends upwards in sequence in the plane where the first radiator is located to form a first connection part and a second connection part, and the feeding point is directly connected to the second connection part; the second radiator is connected to the first The vertical direction of the lower edge of the radiator extends downward to the first section of the radiation surface in the plane where the first radiator is located, and then turns at a right angle to the direction in which the free end of the first radiator extends in the plane, parallel to the direction of the first radiator. The lower edge extends out of the second section of the radiation surface, and then turns upwards at a right angle in the plane and extends until it crosses the free end of the first radiator to form the third section of radiation surface, and then turns away from the direction in which the first radiator extends out of the free end. At a right angle, the fourth radiating surface is extended in this plane, then turning upward at a right angle, and then turning at a right angle in the direction away from the first radiating body extending from the free end, extending the fifth radiating surface in this plane, the first There is a gap between the free end of the five radiating surfaces and the first connecting part to form a first slit, the fifth radiating surface and the upper edge of the first radiating body form a second slit, and the second radiating surface and the first radiating surface form a second slit. The lower edge of a radiator constitutes a third slit, and the width of the fourth segment of the radiation surface is smaller than the width of other parts of the second radiator;

The antenna bracket includes an antenna fixing part, the first radiator of the antenna body is attached to the front surface of the antenna fixing part, the fourth radiation surface of the second radiator is attached to the chamfer where the front surface of the antenna fixing part intersects with the upper surface, and the second The five sections of radiating surface are folded back and attached to the upper surface of the fixed part of the antenna; after the first connecting part is bent backwards, the second connecting part is bent downwards and then forwards, the first connecting part and the second connecting part Attached to the surface of the fixed part of the antenna, the feed point is attached to the lower surface of the fixed part of the antenna, and connected to the RF signal feed point on the mobile phone motherboard, wherein the RF signal feed point and the mobile phone motherboard Connect an inductor between the DC ground on the

It can be seen from the above technical solution that the built-in monopole dual-frequency mobile phone antenna and antenna module in the utility model include a first radiator, a second radiator and a feed point, wherein the feed point is connected in parallel to the main board of the mobile phone and the The inductance between the feed points is connected to the main board of the mobile phone. The first radiator is in the shape of a long and narrow sheet, one end of the second radiator is connected to one end of the first radiator, and surrounds the first radiator, and there is a gap between the free end of the second radiator and the first connecting part. The slit forms a first slit, the upper part of the second radiator parallel to the upper edge of the first radiator forms a second slit with the upper edge, and the second radiator is parallel to the lower edge of the first radiator The lower part and the lower edge form a third slit; the upper part of the second radiator is bent backwards, and the width of the upper part away from the free end of the second radiator is smaller than the width of other parts of the second radiator; The electric point is connected to the first radiator and the second radiator through the second connection part and the first connection part; after the first connection part is bent backwards, the second connection part is bent downwards and then forwards, the feeding The point is connected with the radio frequency RF signal feed point on the main board of the mobile phone, wherein an inductor is connected between the RF signal feed point and the DC ground on the main board of the mobile phone. By adjusting the length and width of the first slit, the second slit and the third slit, as well as the length of the second radiator and the length and width of the first radiator, the high frequency resonant frequency and low frequency of the mobile phone antenna can be adjusted. Resonant frequency, high-frequency bandwidth, low-frequency bandwidth, and the radiation direction of the antenna, because the width of the upper part of the second radiator away from the free end of the second radiator is smaller than the width of other parts of the second radiator, it has a greater impact on the radiation efficiency of the antenna The distance between the first slit and the second slit of the upper part away from the free end of the second radiator is relatively long, therefore, the radiation efficiency of the part of the upper part away from the free end of the second radiator is relatively low. When metal parts are placed nearby, the capacitive characteristics of the antenna due to the placement of metal parts can be eliminated by the inductance connected in parallel between the feed point and the antenna main board. Therefore, in the upper part away from the free end part of the second radiator Placing metal parts near the part of the antenna has little effect on the overall radiation efficiency of the antenna, so that the space actually occupied by the Monopole antenna can be reduced while maintaining the antenna efficiency.

Description of drawings

Fig. 1 is an expanded view of the built-in monopole dual-frequency mobile phone antenna in Embodiment 1 of the present utility model.

Fig. 2 is a perspective view of the state of the built-in monopole dual-frequency mobile phone antenna in the first embodiment of the present invention when it is actually used.

Fig. 3 is a perspective view of the built-in monopole dual-frequency mobile phone antenna module in the second embodiment of the utility model.

Fig. 4 is the return loss curve diagram of the built-in monopole dual-frequency mobile phone antenna in the utility model.

Detailed ways

In order to make the purpose, technical solutions and advantages of the utility model clearer, the utility model will be further described in detail below with reference to the accompanying drawings and examples.

The built-in single-pole dual-frequency mobile phone antenna radiator in the utility model has a feed point, two radiators and three slits for adjusting the radiation efficiency of the antenna, wherein the first radiator is long and narrow, and the second The radiator is connected to one end of the first radiator and surrounds the first radiator. There is a gap between the free end of the second radiator and the first connecting part. The gap is the first slit, and the second radiator The upper part parallel to the upper edge of the first radiator forms a second slit with the upper edge, and the lower part of the second radiator parallel to the lower edge of the first radiator forms a third slit with the lower edge; The upper part of the second radiator is bent backwards, and the width of the upper part away from the free end of the second radiator is smaller than the width of other parts of the second radiator; the feeding point passes through the second connecting part, the first radiator Connected to the second radiator. When the antenna radiating sheet is actually used, the upper part of the second radiator parallel to the upper edge of the first radiator is folded backwards, the first connecting part is bent backwards and attached to the upper surface of the antenna bracket, and the second connecting part is downwards. Then bend it forward and attach it to the upper surface, the rear surface and the lower surface of the antenna bracket, and the feeding point is attached to the lower surface of the antenna bracket. The first radiator is used for radiating high-frequency signals, and the second radiator is used for radiating low-frequency signals, wherein the first slit and the third slit have great influence on the radiation efficiency of the antenna. Adjust the length and width of the two radiators, the length and width of the slit between the two radiators, and the inductance value between the feed point and the main board of the mobile phone in parallel, that is, it can be placed near the antenna while ensuring the radiation efficiency of the antenna. Metal parts, thereby reducing the space actually occupied by the built-in monopole dual-band mobile phone antenna.

Embodiment one

Fig. 1 is an expanded view of the built-in monopole dual-frequency mobile phone antenna in Embodiment 1 of the utility model, and Fig. 2 is a perspective view of the state of the built-in monopole dual-frequency mobile phone antenna in the utility model Embodiment 1 in actual use. The front, back, left, right, up and down directions described herein are all in accordance with the direction coordinates in FIG. 2 .

With reference to Fig. 1, the built-in single-pole dual-frequency mobile phone antenna in the utility model is unfolded, promptly obtains built-in single-pole dual-frequency mobile phone antenna radiation piece, and this mobile phone antenna radiation piece comprises a first radiator 11, a second radiator 12 and feed point 13.

The first radiator 11 is in the shape of a long and narrow sheet.

One end of the first radiator 11 is perpendicular to the upper edge of the first radiator 11 and extends upward in sequence in the plane where the first radiator 11 is located to form a first connecting portion 101 and a second connecting portion 102 , and the feeding point 13 is connected to the second connecting portion 102. The two connecting parts 102 are directly connected.

The second radiator 12 is connected to the end of the first radiator 11 extending out of the first connecting portion 101 , and extends downward along the direction perpendicular to the lower edge of the first radiator 11 within the plane where the first radiator 11 is located. radiating surface 121, then turn at a right angle in the direction of the free end of the first radiator 11 in this plane, and extend a second radiating surface 122 parallel to the lower edge of the first radiator 11, and then turn upwards in this plane extend at a right angle until it crosses the free end of the first radiator 11 to form a third section of radiation surface 123, and then turn at a right angle in the direction extending away from the first radiator 11 to extend out of the free end, and extend a fourth section of radiation surface in this plane 124, then turn upwards at a right angle, and then turn at a right angle in the direction away from the first radiator 11 to extend the free end, and extend the fifth section of the radiation surface 125 in this plane, the free end of the fifth section of the radiation surface 125 is connected to the first radiation surface 125 There is a gap between the connecting parts 101 to form the first slit 14, the lower edge of the fifth section of the radiating surface 125 and the upper edge of the first radiator 11 form the second slit 15, the second section of the radiating surface 122 and the first section of the radiating surface 122 The lower edge of a radiator 11 constitutes the third slit 16 , and the width of the fourth section of the radiation surface 124 is smaller than the width of other parts of the second radiator 12 .

The length and width of the first radiator 11, the length of the second radiator 12 and the respective widths of the fourth radiating surface 124, the first slit 14, the second slit 15 and the third slit 16 affect the radiation efficiency of the antenna The impact is relatively large.

The width of the first connecting portion 101 matches the length of the second radiator 12 and the width of the first slit 14, specifically, because the length of the second radiator 12 and the width of the first slit 14 affect the radiation efficiency of the antenna Therefore, the width of the first connecting portion 101 needs to vary with the length of the second radiator 12 and the width of the first slit 14 . The width of the second connecting portion 102 has little influence on the radiation efficiency of the antenna, and the width of the second connecting portion 102 is mainly determined by the process.

In order to improve the feeding efficiency, and further improve the radiation efficiency of the antenna, the feeding point 13 may turn at a right angle in the plane where the feeding point 13 is located, and extend a predetermined length to form an additional feeding surface 106 . Wherein, the feeding point 13 may turn the right angle toward the direction in which the first radiator 11 extends out of the free end, or may turn the right angle toward the direction away from the first radiator 11 extending out of the free end. The right angle depends on the space reserved for the feed point 13 in the handset.

In order to improve the radiation efficiency of the antenna, it is also possible to turn a right angle at the free end of the fifth radiating surface 125 along the direction away from the first radiator 11, and extend a preset length in the plane where the fifth radiating surface 125 is located, forming The radiating surface 126 is lengthened. The extended radiating surface 126 is used to increase the coupling length with the feeding point 13 when the antenna radiating piece is actually used.

With reference to Fig. 2, when the built-in monopole dual-frequency mobile phone antenna in Fig. 1 is in actual use, the fourth section of radiation surface 124 is pasted on the chamfer where the front surface of the antenna bracket intersects with the upper surface, and the fourth section of radiation surface 124 The upper edge does not exceed the edge of the upper surface of the antenna bracket, and the fifth radiating surface 125 is folded backwards to be attached to the upper surface of the antenna bracket, and the first connecting part 101 is bent backwards and attached to the upper surface of the antenna bracket , the second connecting portion 102 is bent downward and then forward, and is attached to the upper surface, the rear surface and the lower surface of the antenna bracket. The points are connected, wherein an inductor is connected between the RF signal feed point and the DC ground on the main board of the mobile phone.

The utility model also provides another embodiment, which describes the antenna module including the antenna body and the antenna bracket, and particularly explains the position of placing metal parts in the antenna module.

Embodiment two

Fig. 3 is a perspective view of the built-in monopole dual-frequency mobile phone antenna module in the second embodiment of the utility model.

Referring to Fig. 3, the antenna module includes an antenna body and an antenna bracket, wherein the antenna body is the antenna introduced with reference to Fig. 1 and Fig. 2, and the antenna bracket includes an antenna body fixing part 311, a first cavity 312 and a second cavity 313 .

The antenna body fixing part 311 is used to fix the antenna body, specifically, the lower edge of the second radiator 12 is aligned or parallel to the lower edge of the front surface of the antenna fixing part 311, and the fourth radiation surface 124 of the antenna body is attached to the antenna body. On the chamfer where the front surface of the fixed part 311 intersects with the upper surface, and the upper edge of the fourth segment radiation surface 124 does not exceed the edge of the upper surface of the antenna body fixed part 311, the first radiator 11 and the first segment of the antenna body The radiating surface 121, the second radiating surface 122 and the third radiating surface 123 are attached to the front surface of the antenna fixing part 311, and the fifth radiating surface 125 is folded back and attached to the upper surface of the antenna fixing part 311; The first connecting portion 101 of the antenna body is folded back along the surface of the antenna body fixing portion 311 and attached to the surface of the antenna body fixing portion 311, then the second connecting portion 102 is folded down and forward, and the second The connecting portion 102 is attached to the upper surface, the rear surface and the lower surface of the antenna fixing portion 311, and the feed point 13 is attached to the lower surface of the antenna body fixing portion 311, and is connected to the radio frequency RF signal feeding point on the main board of the mobile phone, wherein the An inductor is connected between the RF signal feeding point and the DC ground on the main board of the mobile phone.

The chamfer 3111 where the front surface and the upper surface of the antenna fixing part 311 intersect in FIG. 3 is only a schematic diagram, and the chamfer 3111 is usually an arc chamfer.

The free end of the fifth radiating surface 125 of the second radiating body is coupled to the feeding point 13 (not visible in FIG. 3 ), which is used to increase the coupling length and improve the radiation efficiency of the antenna.

The first cavity 312 is located near the fourth radiating surface 124 and is obtained by extending the antenna fixing part 311 backward near the fourth radiating surface 124. It is used to place metal components. A speaker (speaker) is placed in the first cavity 312 , of course, other metal components in the mobile phone can also be placed in the first cavity 312 , thereby reducing the space actually occupied by the antenna of the mobile phone. When the speaker is placed in the first cavity 312, an opening 3121 is provided on the upper surface of the cavity 312 to facilitate the transmission of sound from the speaker.

The second cavity 313 is located near the position where the first connecting part 101 and the second connecting part 102 are pasted, and the antenna fixing part 311 is positioned backwards near the position where the first connecting part 101 and the second connecting part 102 are pasted. Extended, the first cavity 312 is located on the same side of the antenna bracket, and the first cavity 312 is respectively located on both sides of the feed point 13, for placing metal components, for example, it can be placed in the second cavity 313 The microphone (microphone), of course, can also place other metal parts in the mobile phone in the second cavity 313, thereby reducing the space actually occupied by the antenna of the mobile phone. The upper surface of the second cavity 313 has no opening and is closed.

When a metal part is placed near the antenna, the metal part will generate capacitive impedance to the antenna. This capacitive impedance will cause the impedance mismatch between the antenna and the RF circuit on the main board of the mobile phone, thereby reducing the efficiency of the antenna. The inductance connected in parallel between the RF signal feeding point and the DC ground can eliminate the capacitive impedance, thereby eliminating the effect of placing metal parts near the antenna on the antenna efficiency. Experiments show that when the high-frequency resonance frequency is 1800MHz and the low-frequency resonance frequency is 900MHz, the optimum value of the inductance connected in parallel is 4.2nH.

Since the antenna body is attached to multiple surfaces of the antenna bracket, and the routing form of the antenna body and the inductance connected between the RF signal feed point of the mobile phone motherboard and the DC ground make it possible to place metal parts near the antenna body, wherein The RF signal feed point is connected to the feed point 13 of the antenna, and the minimum distance between the metal part and the antenna body can be 3 mm, therefore, the volume of the antenna support can be made very small. The length to its right side can be 40mm, the width from its front to its back can be 20.8mm at its widest and 6.7mm at its narrowest, and the minimum height from its top to its bottom can be 6.85mm. The minimum height of the antenna bracket from top to bottom is only 6.85mm, which makes it possible to design a thinner mobile phone, and the overall volume of the antenna bracket is also smaller, which makes it possible to design a thin and small mobile phone .

The antenna or the antenna body described in the above embodiments are all made of flexible printed circuit (FPC), so that the antenna or the antenna body can be attached to the antenna support.

Next, how the three slits, two radiators and one feeding point in the above embodiment adjust the high and low frequency resonant frequency and bandwidth of the antenna will be further explained:

(1) High frequency resonance point and high frequency bandwidth can be adjusted by adjusting the length and width of the first radiator 11, low frequency resonance point and low frequency bandwidth can be adjusted by adjusting the length of the second radiator 12, and low frequency resonance point and low frequency bandwidth can be adjusted by adjusting the first narrow The length and width of the slit 14, the second slit 15, and the third slit 16, as well as the inductance value connected between the RF signal feeding point of the main board of the mobile phone and the DC ground, can adjust the radiation efficiency of the antenna. Wherein, the fifth radiation surface 125 of the second radiator is coupled with the first radiator 11 through the second slit 15, and the length and width of the second slit 15 and the third slit 16 have a greater influence on the radiation efficiency of the antenna. big.

(2) For the adjustment of the length of the second radiator 12, it can be realized by adjusting the length of the part of the second radiator 12 parallel to the upper and lower sides of the first radiator 11, or by adjusting the length of the lengthening radiation surface 126 to fulfill.

After adjusting the high-frequency resonant frequency, low-frequency resonant frequency, high-frequency bandwidth, low-frequency bandwidth and radiation efficiency of the antenna by using the above-mentioned one feed point, two radiators, three slits and inductance value, the built-in The return loss curve of the single-pole dual-band mobile phone antenna is shown in Figure 4. In Figure 4, the low frequency band of about 900MHz and the high frequency band of about 1800MHz are taken as examples.

It can be seen that in the antenna and antenna module of the present invention, since the upper part of the second radiator is far away from the free end part of the second radiator, it is narrower than the other parts of the second radiator, which has a greater influence on the radiation efficiency of the antenna. The distance between the slit and the second slit and the upper part away from the free end part of the second radiator is relatively long, so the radiation efficiency is low. The capacitive characteristic can be eliminated by the inductance connected in parallel between the feed point and the main board of the antenna. Therefore, placing a metal part near the part of the upper part away from the free end part of the second radiator has little influence on the overall radiation efficiency of the antenna. Therefore, the space actually occupied by the Monopole antenna can be reduced while maintaining the antenna efficiency.

The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the protection scope of the present utility model. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present utility model shall be included in the protection scope of the present utility model.

Claims (12)

1, a kind of built-in monopole dual-frequency mobile phone antenna radiator, it is characterized in that, this radiator comprises the first radiator (11), the second radiator (12) and feed point (13); The first radiator (11) is in the shape of a long and narrow sheet; One end of the first radiator (11) is perpendicular to the upper edge of the first radiator (11) and extends upward in sequence in the plane where the first radiator (11) is located to form a first connection part (101) and a second connection part (102), the feed point (13) is directly connected to the second connection part (102); The second radiator (12) is connected to one end of the first radiator (11) extending out of the first connecting portion (101), and is connected to the first radiator (11) along a direction perpendicular to the lower edge of the first radiator (11). 11) The first radiation surface (121) extends downwards in the plane, and then turns at a right angle to the direction of the free end of the first radiation body (11) in the plane, and is parallel to the bottom of the first radiation body (11). The edge extends out of the second section of radiation surface (122), and then turns upwards at a right angle in this plane and extends until it crosses the free end of the first radiation body (11), forming a third section of radiation surface (123), and then away from the first radiation surface (123). The radial body (11) is turned at a right angle in the direction extending from the free end, and a fourth radiation surface (124) is extended in the plane, and then turned upward at a right angle, and then moves away from the direction in which the first radiator (11) extends out of the free end Turn a right angle, and extend the fifth section of radiation surface (125) in this plane; There is a gap between the free end of the fifth radiating surface (125) and the first connecting part (101), forming a first slit (14), the fifth radiating surface (125) and the first radiator (11) The upper edge of the upper edge forms the second slit (15), the second radiating surface (122) and the lower edge of the first radiating body (11) form the third slit (16), and the fourth radiating surface (124) The width is smaller than the width of other parts of the second radiator (12). 2. The mobile phone antenna radiator according to claim 1, characterized in that: The free end of the fifth section of radiating surface (125) turns at a right angle in the plane where the fifth section of radiating surface (125) is located along the direction away from the second slit (15), and extends to a preset length to form an elongated Radiating face (126). 3. The mobile phone antenna radiator according to claim 1 or 2, characterized in that, The feeding point (13) turns at a right angle in the plane where the feeding point (13) is located, and extends for a predetermined length to form an additional feeding surface (106). 4. A built-in monopole dual-frequency mobile phone antenna, characterized in that the antenna includes a first radiator (11), a second radiator (12) and a feed point (13); The first radiator (11) is in the shape of a long and narrow sheet; One end of the first radiator (11) is perpendicular to the upper edge of the first radiator (11) and extends upward in sequence in the plane where the first radiator (11) is located to form a first connection part (101) and a second connection part (102), the feed point (13) is directly connected to the second connection part (102); The second radiator (12) is connected to one end of the first radiator (11) extending out of the first connecting portion (101), and is connected to the first radiator (11) along a direction perpendicular to the lower edge of the first radiator (11). 11) The first radiation surface (121) extends downwards in the plane, and then turns at a right angle to the direction of the free end of the first radiation body (11) in the plane, and is parallel to the bottom of the first radiation body (11). The edge extends out of the second section of radiation surface (122), and then turns upwards at a right angle in this plane and extends until it crosses the free end of the first radiation body (11), forming a third section of radiation surface (123), and then away from the first radiation surface (123). The radial body (11) is turned at a right angle in the direction extending from the free end, and a fourth radiation surface (124) is extended in the plane, and then turned upward at a right angle, and then moves away from the direction in which the first radiator (11) extends out of the free end Turn a right angle, and extend the fifth section of radiation surface (125) in this plane; There is a gap between the free end of the fifth radiating surface (125) and the first connecting part (101), forming a first slit (14), the fifth radiating surface (125) and the first radiator (11) The upper edge of the upper edge forms the second slit (15), the second radiating surface (122) and the lower edge of the first radiating body (11) form the third slit (16), and the fourth radiating surface (124) The width is smaller than the width of other parts of the second radiator (12); The fourth radiating surface (124) is attached to the chamfer where the front surface of the antenna bracket intersects with the upper surface, and the fifth radiating surface (125) is folded backward; After the first connecting part (101) is bent backward, and the second connecting part (102) is bent downward and forward, the feeding point (13) is connected with the RF signal feeding point on the main board of the mobile phone, wherein the An inductor is connected between the RF signal feeding point and the DC ground on the main board of the mobile phone. 5. The mobile phone antenna according to claim 4, characterized in that, The free end of the fifth section of radiating surface (125) turns at a right angle in the plane where the fifth section of radiating surface (125) is located along the direction away from the second slit (15), and extends to a preset length to form an elongated Radiating face (126). 6. The mobile phone antenna according to claim 4 or 5, characterized in that, The feeding point (13) turns at a right angle in the plane where the feeding point (13) is located, and extends for a predetermined length to form an additional feeding surface (106). 7. A built-in monopole dual-frequency mobile phone antenna module, characterized in that the antenna module includes an antenna body and an antenna bracket; The antenna body has a first radiator (11) in the shape of a long and narrow sheet, a second radiator (12) connected to one end of the first radiator (11), and a feed point (13); the first One end of the radiator (11) connected to the second radiator (12) is perpendicular to the upper edge of the first radiator (11) and extends upward in sequence in the plane where the first radiator (11) is located to form a first connection part ( 101) and the second connection part (102), the feed point (13) is directly connected to the second connection part (102); the second radiator is in the direction perpendicular to the lower edge of the first radiator (11) The first radiation surface (121) extends downwards in the plane where the radiator (11) is located, and then turns at a right angle to the direction in which the free end of the first radiator (11) extends in the plane, and is parallel to the first radiator (11). ) extends out of the second radiating surface (122), and then turns upwards at a right angle in the plane and extends until it crosses the free end of the first radiating body (11), forming a third radiating surface (123), and then Turn away from the first radiator (11) and turn at a right angle in the direction of the free end, extend the fourth section of radiation surface (124) in this plane, then turn upward at a right angle, and then extend away from the first radiator (11) The direction of the free end is turned at a right angle, and a fifth section of radiating surface (125) is extended in this plane, and there is a gap between the free end of the fifth section of radiating surface (125) and the first connecting part (101), forming the first The slit (14), the fifth radiating surface (125) and the upper edge of the first radiating body (11) form the second slit (15), the second radiating surface (122) and the first radiating body (11) The lower edge of the second radiating body (12) constitutes the third slit (16), and the width of the fourth section of the radiating surface (124) is smaller than the width of other parts of the second radiating body (12); The antenna support includes an antenna fixing part (311), the first radiator (11) of the antenna body is attached to the front surface of the antenna fixing part (311), and the fourth radiation surface (124) of the second radiator (12) is attached to On the chamfer where the front surface of the antenna fixing part (311) intersects with the upper surface, and the fifth section of the radiating surface (125) is folded back and attached to the upper surface of the antenna fixing part (311); the first connecting part ( 101) After bending backwards, the second connecting part (102) is bent downwards and forwards, the first connecting part (101) and the second connecting part (102) are attached to the surface of the antenna fixing part (311) , the feed point (13) is attached to the lower surface of the antenna fixing part (311), and is connected with the radio frequency RF signal feed point on the mobile phone main board, wherein, the RF signal feed point and the direct current on the mobile phone main board An inductor is connected between the grounds. 8. The antenna module according to claim 7, characterized in that, The free end of the fifth section of radiating surface (125) turns at a right angle in the plane where the fifth section of radiating surface (125) is located along the direction away from the second slit (15), and extends to a preset length to form an elongated Radiating face (126). 9. The antenna module according to claim 7, characterized in that, The feeding point (13) turns at a right angle in the plane where the feeding point (13) is located, and extends for a predetermined length to form an additional feeding surface (106). 10. The antenna module according to any one of claims 7 to 9, characterized in that, The antenna fixing part (311) extends backward out of a first cavity (312) at a position close to the fourth radiation surface (124), for placing metal components. 11. The antenna module according to any one of claims 7 to 9, characterized in that, The antenna fixing part (311) extends backward out of a second cavity (313) near the position where the first connecting part (101) and the second connecting part (102) are pasted, and the second cavity (313) and The first cavity (312) is located on the same side of the antenna bracket (31), and is respectively located on the left and right sides of the feed point (13) with the first cavity (312), and the second cavity (313) is used to place metal part. 12. The antenna module according to any one of claims 7 to 9, characterized in that, The lower edge of the second radiator (12) is aligned with or parallel to the lower edge of the antenna bracket (31).

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