CN215896708U

CN215896708U - Metal frame antenna module and mobile phone

Info

Publication number: CN215896708U
Application number: CN202121476614.9U
Authority: CN
Inventors: 王远
Original assignee: Dongguan Ruixiang Xuntong Communication Technology Co ltd
Current assignee: Dongguan Ruixiang Xuntong Communication Technology Co ltd
Priority date: 2021-07-01
Filing date: 2021-07-01
Publication date: 2022-02-22
Anticipated expiration: 2031-07-01

Abstract

The utility model provides a metal frame antenna assembly and a mobile phone, which comprise a metal frame arranged along the edge of the mobile phone and a circuit main board positioned in the mobile phone; the metal frame comprises an upper frame, a right frame, a lower frame and a left frame which are sequentially connected end to end; the distances between the circuit main board and the upper and lower frames are both 1.5 +/-0.5 mm, and the distances between the circuit main board and the left and right frames are both 1 +/-0.5 mm; the upper frame is provided with a feed point at a first distance from the left frame, and the left frame is provided with a place at a second distance from the upper frame, wherein the first distance is 14% + -3% of the total length of the upper frame, and the second distance is 10% + -2% of the total length of the left frame. Through the relative position of injecing metal frame and circuit board and the position of ground feed point on the metal frame for the LOOP antenna that the metal frame formed has the bandwidth of broad in GPS, 2.4G and 5G frequency channel, has improved the efficiency of antenna simultaneously, has solved the lower, narrower problem of bandwidth of current metal frame antenna efficiency.

Description

Metal frame antenna module and mobile phone

Technical Field

The utility model relates to the technical field of wireless communication, in particular to a metal frame antenna assembly and a mobile phone.

Background

With the development of society, people expect that the screen of the mobile phone is as large as possible and the thickness of the mobile phone is as thin as possible on the basis of ensuring the functional performance of the mobile phone. However, the realization of each function of the mobile phone as a wireless communication device depends on the corresponding antenna, and the large occupation ratio of the screen and the reduction of the thickness of the mobile phone make the environment of the antenna in the mobile phone worse and worse, thereby causing the performance of the antenna to be limited.

According to research and analysis, along with the coming of the 5G era, the metal frame and the glass rear cover, the metal frame and the ceramic rear cover and the integrated ceramic body are expected to become one of important development directions and product personalized selling points of the mobile phone body in the future. However, the simple metal frame design may cause the antenna signal inside the mobile phone to be shielded or interfered by the metal frame, thereby causing the performance of the antenna to be poor. In order to improve the wireless communication performance of the mobile phone while keeping the design of the metal frame, research and development personnel think whether the metal frame can be used as an antenna, so that the problem of non-ideal performance when the antenna is arranged in the mobile phone due to the small internal space of the mobile phone is solved. The fact proves that the metal frame is feasible as the antenna and has a good development prospect.

However, the existing mobile phone screen occupies a large area, so that the metal frame is closer to electronic components such as a mobile phone motherboard and a display screen, and the external radiation of the metal frame antenna is absorbed by the electronic components such as the mobile phone motherboard and the display screen, so that the antenna efficiency is reduced, the bandwidth is narrowed, and the requirements of multi-frequency, high radiation and wide bandwidth are difficult to meet.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a metal frame antenna assembly and a mobile phone, and aims to solve the problems of low efficiency and narrow bandwidth of the conventional metal frame antenna.

In order to solve the technical problem, the utility model provides a metal frame antenna assembly, which comprises a metal frame arranged along the edge of a mobile phone and a circuit main board positioned in the mobile phone; the metal frame comprises an upper frame, a right frame, a lower frame and a left frame which are sequentially connected end to end; the distance between the circuit main board and the upper frame and the distance between the circuit main board and the lower frame are both 1.5 +/-0.5 mm, and the distance between the circuit main board and the left frame and the distance between the circuit main board and the right frame are both 1 +/-0.5 mm; the upper frame is provided with a feeding point at a first distance from the left frame, the left frame is provided with a place at a second distance from the upper frame, wherein the first distance is 14% +/-3% of the total length of the upper frame, and the second distance is 10% +/-2% of the total length of the left frame.

Optionally, in the metal bezel antenna assembly, the upper bezel has a notch, and the length of the notch is 1.5 ± 0.5 mm.

Optionally, in the metal bezel antenna assembly, the notch is disposed adjacent to the feed point on a side close to the right bezel.

Optionally, in the metal frame antenna assembly, a matching circuit is printed on the circuit board, and the matching circuit includes a capacitor, a first inductor, a second inductor, a third inductor, and a radio frequency terminal; one end of the capacitor is connected with the feed point, the other end of the capacitor is connected with one end of the first inductor, and the other end of the first inductor is connected with the radio frequency end; the second inductor is connected between the feed point and the capacitor in parallel and grounded; the third inductor is connected in parallel between the capacitor and the first inductor and grounded.

Optionally, in the metal frame antenna assembly, a value range of the capacitor is 0.5 ± 0.3pF, a value range of the first inductor is 1 to 5.6nH, a value range of the second inductor is 12 to 33nH, and a value range of the third inductor is 2.4 to 8.2 nH.

Optionally, in the metal bezel antenna assembly, the metal bezel antenna assembly further includes a parasitic antenna, the parasitic antenna and the metal bezel are disposed at an interval, the parasitic antenna has a parasitic place, and the parasitic antenna is grounded through the parasitic place.

Optionally, in the metal bezel antenna assembly, a distance between the parasitic antenna and the metal bezel is at least 0.8 mm.

Optionally, in the metal bezel antenna assembly, the parasitic antenna is disposed adjacent to the left bezel and the site, and is located between the site and the upper bezel; the parasitic location is disposed proximate to the location.

Optionally, in the metal bezel antenna assembly, the total length of the parasitic antenna is 8 ± 1mm, the total width of the parasitic antenna is 2 ± 0.5mm, and the length direction of the parasitic antenna is consistent with the length direction of the left bezel.

In order to solve the above technical problem, the present invention further provides a mobile phone, where the mobile phone includes the metal bezel antenna assembly as described in any one of the above.

The utility model provides a metal frame antenna assembly and a mobile phone, which comprise a metal frame arranged along the edge of the mobile phone and a circuit main board positioned in the mobile phone; the metal frame comprises an upper frame, a right frame, a lower frame and a left frame which are sequentially connected end to end; the distance between the circuit main board and the upper frame and the distance between the circuit main board and the lower frame are both 1.5 +/-0.5 mm, and the distance between the circuit main board and the left frame and the distance between the circuit main board and the right frame are both 1 +/-0.5 mm; the upper frame is provided with a feeding point at a first distance from the left frame, the left frame is provided with a place at a second distance from the upper frame, wherein the first distance is 14% +/-3% of the total length of the upper frame, and the second distance is 10% +/-2% of the total length of the left frame. Through the relative position of injecing metal frame and circuit board and the position of ground feed point on the metal frame for metal frame forms an LOOP antenna, and this LOOP antenna has the bandwidth of broad at GPS, 2.4G and 5G frequency channels, has improved the efficiency of antenna simultaneously, has solved the lower, narrower problem of bandwidth of current metal frame antenna efficiency.

Drawings

Fig. 1 is a schematic structural diagram of a metal bezel antenna assembly according to the present embodiment;

fig. 2 is a schematic structural diagram of the matching circuit provided in this embodiment;

fig. 3 is a schematic structural diagram of a metal frame antenna assembly for adding a parasitic antenna according to the present embodiment;

fig. 4 is a schematic size diagram of a metal frame antenna assembly for adding a parasitic antenna according to the present embodiment;

fig. 5 is a diagram illustrating a test result of the metal bezel antenna assembly with the parasitic antenna provided in the present embodiment;

wherein the reference numerals are as follows:

110-upper border; 120-right frame; 130-lower border; 140-left border; 101-a feeding point; 102-a location; a 111-notch; 200-a circuit motherboard; 300-parasitic antenna.

Detailed Description

The metal frame antenna assembly and the mobile phone according to the present invention will be described in detail with reference to the accompanying drawings and specific embodiments. It is to be noted that the drawings are in a very simplified form and are not to precise scale, which is merely for the purpose of facilitating and distinctly claiming the embodiments of the present invention. Further, the structures illustrated in the drawings are often part of actual structures. In particular, the drawings may have different emphasis points and may sometimes be scaled differently.

It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the accompanying drawings are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order, and it is to be understood that such structures as are used are interchangeable where appropriate. Also, "upper", "lower", "left", "right", and the like are used only for explaining relative positions between the components, and are not used for limiting specific existing position states, and it is to be understood that structures thus used may be interchanged under appropriate circumstances. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

The present embodiment provides a metal bezel antenna assembly, as shown in fig. 1, the metal bezel antenna assembly includes a metal bezel disposed along an edge of a mobile phone and a circuit board 200 located in the mobile phone; the metal frame comprises an upper frame 110, a right frame 120, a lower frame 130 and a left frame 140 which are sequentially connected end to end; the distance between the circuit main board 200 and the upper frame 110 and the distance between the circuit main board and the lower frame 130 are both 1.5mm plus or minus 0.5mm, and the distance between the circuit main board 200 and the left frame 140 and the right frame 120 are both 1mm plus or minus 0.5 mm; the upper frame 110 is provided with a feeding point 101 at a first distance from the left frame 140, and the left frame 140 is provided with a point 102 at a second distance from the upper frame 110, where the first distance is 14% ± 3% of the total length of the upper frame 110, and the second distance is 10% ± 2% of the total length of the left frame 140.

The metal frame antenna module that this embodiment provided is through the relative position of injecing metal frame and circuit board and the position of ground feed point on the metal frame for the metal frame forms a LOOP antenna, and this LOOP antenna has the bandwidth of broad in GPS, 2.4G and 5G frequency channels, has improved the efficiency of antenna simultaneously, has solved the lower, narrower problem of bandwidth of current metal frame antenna efficiency.

Further, in this embodiment, the upper frame 110 has a gap 111, and the length of the gap 111 is 1.5 ± 0.5 mm. Therefore, the metal frame has two radiation ends, the metal frame between the feed point 101 and the place 102 is used for forming a 5G frequency band, the metal frame in the remaining area is used for forming a 2.4G frequency band, and the whole metal frame is used for forming a GPS frequency band, so that the metal frame can simultaneously realize the coverage of three wireless communication frequency bands.

Preferably, the notch 111 is disposed adjacent to a side of the feeding point 101 close to the right frame 120. The notch is arranged at the position, so that the GPS frequency band, the 2.4G frequency band and the 5G frequency band have better bandwidth and radiation performance. Of course, in the specific application process, the setting position of the notch can be finely adjusted to find out the better performance of the metal frame antenna.

In order to adjust the impedance matching between the metal frame antenna and the signal transmission line, in this embodiment, the circuit board 200 is printed with a matching circuit, as shown in fig. 2, the matching circuit includes a capacitor C, a first inductor L1, a second inductor L2, a third inductor L3, and a radio frequency terminal RFC; one end of the capacitor is connected to the feeding point 101, the other end of the capacitor is connected to one end of the first inductor L1, and the other end of the first inductor L1 is connected to the radio frequency terminal RF; the second inductor L2 is connected in parallel with the ground between the feeding point 101 and the capacitor C; the capacitor C and the first inductor L1 are connected in parallel with the third inductor L3 to be grounded.

Through the tuning of the matching circuit, the radiation performance of the antenna can be improved on the basis of ensuring that the metal frame antenna has wider bandwidth in a GPS frequency band, a 2.4G frequency band and a 5G frequency band, so that the efficiency of the antenna is further improved.

Specifically, in this embodiment, the value range of the capacitor C is 0.5 ± 0.3pF, the value range of the first inductor L1 is 1-5.6 nH, the value range of the second inductor L2 is 12-33 nH, and the value range of the third inductor L3 is 2.4-8.2 nH. Considering that the size, thickness, material, and the like of the metal frame are different in different application scenarios, the selection can be performed within the value range provided in the present embodiment according to specific situations, so as to select the scheme with the best antenna performance.

Of course, in other embodiments, the matching circuit may have a more complex design to achieve better tuning results. The matching circuit provided by the embodiment can enable the performance of the tuned antenna to meet the communication requirement of the mobile phone through the simplest circuit structure, thereby reducing the design and production cost.

Due to the addition of the matching circuit, the antenna loss is generally increased, so that the passive return loss is large, and the improvement of the antenna efficiency is limited. Therefore, in order to reduce the passive return loss of the antenna and further improve the bandwidth and efficiency of the antenna, in this embodiment, as shown in fig. 3, the metal bezel antenna assembly further includes a parasitic antenna 300, the parasitic antenna 300 is disposed at a distance from the metal bezel, the parasitic antenna 300 has a parasitic ground (not shown in the figure), and the parasitic antenna 300 is grounded through the parasitic ground.

Further, in this embodiment, the distance between the parasitic antenna 300 and the metal frame is at least 0.8 mm. Therefore, high-efficiency coupling between the parasitic antenna and the metal frame antenna can be guaranteed, and the bandwidth and the efficiency of the antenna are improved.

Specifically, the parasitic antenna 300 is disposed adjacent to the left frame 140 and the site 102, and is located between the site 102 and the upper frame 110. As can be seen from fig. 3, the area of the left bezel 140 near the parasitic antenna 300 generates the 5G frequency band, so that the parasitic antenna 300 is added here to effectively widen the bandwidth of the 5G frequency band, thereby improving the communication performance of the antenna in the 5G frequency band.

And the parasitic site is arranged close to the site 102, so that the coupling efficiency at the 5G frequency band section can be further improved, and further the radiation performance of the 5G frequency band section can be improved.

In this embodiment, the total length of the parasitic antenna 300 is 8 ± 1mm, the total width is 2 ± 0.5mm, and the length direction of the parasitic antenna 300 is the same as the length direction of the left frame 140. Specifically, the parasitic antenna 300 may be a section of wiring formed on the middle frame of the mobile phone by the LDS process, or may be a copper foil or an FPC attached to the middle frame of the mobile phone. In the present embodiment, the parasitic antenna 300 is a straight line segment, but in other embodiments, the parasitic antenna may have other structures. It should be noted that other parasitic antenna structures without departing from the spirit of the present invention are also within the scope of the present invention.

Of course, adding parasitic antenna 300 at left bezel 140 to boost bandwidth and radiation performance for the corresponding 5G band can suggest to those skilled in the art to place parasitic antennas in other areas of the metal bezel to boost bandwidth and radiation performance in other frequency bands. In the embodiment, in practical application, 5G is in a high frequency band, loss attenuation is obvious, and performance of low frequency and medium frequency already meets wireless communication requirements of the mobile phone without adding a parasitic antenna, so that an additional parasitic antenna is not needed to be added to save manufacturing cost.

In addition, the embodiment also provides a mobile phone, which comprises the metal frame antenna assembly provided by the embodiment.

The following describes a metal bezel antenna assembly according to an embodiment of the present invention with reference to fig. 3, fig. 4, and fig. 5. It should be noted that the dimensions mentioned in the following examples are all approximate numbers, and the examples are only used to illustrate the utility of the metal bezel antenna assembly provided by the present invention, and cannot limit the application range of the metal bezel antenna assembly.

The length of the metal frame provided by the embodiment is 150mm, and the width is 70mm, that is, the lengths of the upper frame 110 and the lower frame 130 are 70mm, and the lengths of the left frame 140 and the right frame 120 are 150 mm; the thickness of the metal frame is 1.5 mm. The metal frame provided by the embodiment is made of copper.

The distance between the circuit main board 200 and the upper frame 110 and the lower frame 120 is 1.5mm, and the distance between the circuit main board 200 and the left frame 140 and the right frame 120 is 1 mm.

A feeding point 101 is arranged at a position, which is about 10mm away from the left frame 140, of the upper frame 110, a notch 111 is formed in one side, which is close to the feeding point 101 and far away from the left frame 140, of the upper frame 110, and the length of the notch 111 is 1.5 mm; the site 102 is located approximately 15mm from the upper frame 110 at the left frame 140.

Inside the mobile phone, a parasitic antenna 300 is disposed at a position about 1mm away from the left frame 140, the parasitic antenna 300 is a metal wire with a length of 8mm and a width of 2mm, and the parasitic antenna 300 is disposed in parallel with the left frame 140. Parasitic antenna 300 is located between site 102 and upper bezel 110 at a vertical distance of approximately 5mm from upper bezel 110. Parasitic antenna 300 has a parasitic location, which is preferably located near one end of location 102, through which parasitic antenna 300 is grounded.

The passive waveform of the test is shown in fig. 5 by testing the metal frame antenna component with the above size structure. Test results show that the metal frame antenna assembly provided by the embodiment can generate three resonances with different frequencies, which respectively correspond to a GPS frequency band, a 2.4G frequency band and a 5G frequency band, and the return loss in the three frequency bands is below-5 dB; meanwhile, a plurality of waveforms are generated in the range of the 5G frequency band, and the coverage bandwidth is wide. That is to say, the metal bezel antenna assembly provided by this embodiment can generate signal radiation with a wider bandwidth and better performance in the GPS frequency band, the 2.4G frequency band, and the 5G frequency band.

In summary, the metal frame antenna assembly and the mobile phone provided in this embodiment include a metal frame disposed along an edge of a mobile phone and a circuit board located in the mobile phone; the metal frame comprises an upper frame, a right frame, a lower frame and a left frame which are sequentially connected end to end; the distance between the circuit main board and the upper frame and the distance between the circuit main board and the lower frame are both 1.5 +/-0.5 mm, and the distance between the circuit main board and the left frame and the distance between the circuit main board and the right frame are both 1 +/-0.5 mm; the upper frame is provided with a feeding point at a first distance from the left frame, the left frame is provided with a place at a second distance from the upper frame, wherein the first distance is 14% +/-3% of the total length of the upper frame, and the second distance is 10% +/-2% of the total length of the left frame. Through the relative position of injecing metal frame and circuit board and the position of ground feed point on the metal frame for metal frame forms an LOOP antenna, and this LOOP antenna has the bandwidth of broad at GPS, 2.4G and 5G frequency channels, has improved the efficiency of antenna simultaneously, has solved the lower, narrower problem of bandwidth of current metal frame antenna efficiency.

It should be noted that, in the present specification, the embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, similar parts between the embodiments may be referred to each other, and different parts between the embodiments may also be used in combination with each other, which is not limited by the present invention.

The above description is only for the purpose of describing the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention, and any variations and modifications made by those skilled in the art based on the above disclosure are within the scope of the appended claims.

Claims

1. The metal frame antenna assembly is characterized by comprising a metal frame arranged along the edge of a mobile phone and a circuit main board positioned in the mobile phone; the metal frame comprises an upper frame, a right frame, a lower frame and a left frame which are sequentially connected end to end; the distance between the circuit main board and the upper frame and the distance between the circuit main board and the lower frame are both 1.5 +/-0.5 mm, and the distance between the circuit main board and the left frame and the distance between the circuit main board and the right frame are both 1 +/-0.5 mm; the upper frame is provided with a feeding point at a first distance from the left frame, the left frame is provided with a place at a second distance from the upper frame, wherein the first distance is 14% +/-3% of the total length of the upper frame, and the second distance is 10% +/-2% of the total length of the left frame.

2. The metal bezel antenna assembly of claim 1, wherein the upper bezel has a notch having a length of 1.5 ± 0.5 mm.

3. The metal bezel antenna assembly of claim 2, wherein the notch is disposed proximate to a side of the feed point proximate to the right bezel.

4. The metal bezel antenna assembly of claim 1, wherein the circuit board is printed with a matching circuit comprising a capacitor, a first inductor, a second inductor, a third inductor and a radio frequency terminal; one end of the capacitor is connected with the feed point, the other end of the capacitor is connected with one end of the first inductor, and the other end of the first inductor is connected with the radio frequency end; the second inductor is connected between the feed point and the capacitor in parallel and grounded; the third inductor is connected in parallel between the capacitor and the first inductor and grounded.

5. The metal bezel antenna assembly of claim 4, wherein the capacitance has a value in a range of 0.5 ± 0.3pF, the first inductance has a value in a range of 1-5.6 nH, the second inductance has a value in a range of 12-33 nH, and the third inductance has a value in a range of 2.4-8.2 nH.

6. The metal bezel antenna assembly of claim 4, further comprising a parasitic antenna spaced from the metal bezel, the parasitic antenna having a parasitic ground through which the parasitic antenna is grounded.

7. The metal bezel antenna assembly of claim 6, wherein a distance between the parasitic antenna and the metal bezel is a minimum of 0.8 mm.

8. The metal bezel antenna assembly of claim 6, wherein the parasitic antenna is disposed adjacent to the left bezel and adjacent to the site and between the site and the upper bezel; the parasitic location is disposed proximate to the location.

9. The metal bezel antenna assembly of claim 8, wherein the parasitic antenna has an overall length of 8 ± 1mm and an overall width of 2 ± 0.5mm, and wherein a length direction of the parasitic antenna is coincident with a length direction of the left bezel.

10. A handset, characterized in that the handset comprises the metal bezel antenna assembly as claimed in any one of claims 1 to 9.