TWI747551B - Multi-antenna structure for mobile phone with metal frame - Google Patents

Abstract

The present invention relates to a multi-antenna structure for a mobile phone with a metal frame, including a substrate, The first type antenna, the second type antenna, the third type antenna and the fourth type antenna are arranged between the display panel and the substrate; the first type antenna is arranged on the short side of the substrate for transmitting and receiving a first frequency band, The first type antenna includes a first antenna and a corresponding fifth antenna; the second type antenna is arranged on the short side of the substrate for transmitting and receiving a second frequency band, and the second type antenna includes a second antenna and a corresponding first antenna. Six antennas; the third type antenna is arranged on the long side of the substrate for transmitting and receiving a third frequency band, the third type antenna includes the third antenna and the corresponding seventh antenna; and the fourth type antenna is arranged on the length of the substrate On the side, for transmitting and receiving a fourth frequency band, the fourth type antenna includes a fourth antenna and a corresponding eighth antenna.

Description

Multi-antenna structure for mobile phone with metal frame

The present invention is a multi-antenna structure used in a mobile phone with a metal frame, and particularly refers to an electronic device with a multi-antenna structure that can improve the problem of signal difference caused by metal shielding.

In today's era of information explosion, everyone has a smart phone, and the development of the Internet has also evolved from cable networks to UTP wire networks to the replacement of wired networks by wireless. The telescopic antenna of the past mobile handheld phone has evolved from a telescopic type to a reduced antenna, and then turned to a reduced size and hidden in the flat antenna of the current smart phone. Therefore, the antenna is already an indispensable device in daily life. When the smaller the device, the smaller the antenna becomes. It is necessary to consider how to reduce the area without reducing the original efficiency.

Secondly, today's mobile devices require a large amount of data transmission and high speed. In addition to the basic multi-frequency bands, they also have a multiple-input multiple-output (MIMO) antenna design. Through the multiple-input multiple-output antenna design, different signals can be processed at the same time for transmission. And reception, multi-antenna reception can increase the stability during reception. Furthermore, mobile devices such as notebook computers, tablet computers, or mobile phones are mostly built-in antennas, and a specific antenna space needs to be reserved in the internal space of the device. However, because mobile devices not only emphasize the needs of lightness, thinness, and portability, but also emphasize the beauty and texture of the product, their appearance design often uses metal or materials with conductive functions. The lack of space often causes the radiation characteristics of the antenna to decrease, but having enough space causes the thickness of the electronic device to increase. In the literature, most designs use the unipolar coupling gap method to excite the resonant mode. In recent years, different types of antennas have been adopted to solve the problem of metal frame shielding in mobile communication devices. In a design with multiple antennas, in a single It is not difficult to pursue high efficiency in each antenna. However, when multiple antennas are jointly connected to a 5G network, it is difficult to maintain the transmission rate, because if the design and arrangement are improper, serious interference may occur.

In view of the above-mentioned shortcomings, the purpose of the present invention is to provide a multi-antenna structure for mobile phones with a metal frame, which can improve the problem of poor signal due to metal shielding, while maintaining the performance of multiple antennas in a small space. And low envelope correlation coefficient (envelope correlation coefficient, ECC).

To achieve the above objective, the present invention provides a multi-antenna structure for a mobile phone with a metal frame, which includes a substrate, a first type antenna, a second type antenna, a third type antenna, and a fourth type antenna; , The substrate includes a back plate and a side plate. Secondly, the first type antenna is arranged on the short side of the substrate for transmitting and receiving a first frequency band. The first type antenna includes a first antenna and a fifth antenna, and the fifth antenna corresponds to the first antenna. Antenna arrangement, the first antenna is arranged on a first interface, and the fifth antenna is arranged on the fifth interface. Furthermore, the second type antenna is arranged on the short side of the substrate and adjacent to the first type antenna for transmitting and receiving a second frequency band. The second type antenna includes a second antenna and a first antenna. Six antennas, the sixth antenna is arranged corresponding to the second antenna, the second antenna is arranged on a second interface, and the sixth antenna is arranged on the sixth interface. Furthermore, the third type antenna is arranged on the long side of the substrate for transmitting and receiving a third frequency band. The third type antenna includes a third antenna and a seventh antenna, and the seventh antenna corresponds to The third antenna is arranged, the third antenna is arranged on a third interface, and the seventh antenna is arranged on the seventh interface. In addition, the fourth type antenna is arranged on the long side of the substrate and adjacent to the third type antenna for transmitting and receiving a fourth frequency band. The fourth type antenna includes a fourth antenna and an eighth antenna. Antenna, the eighth antenna is set corresponding to the fourth antenna, the fourth antenna is set on a fourth interface, and the eighth antenna is set on the eighth interface; wherein, the first type antenna and the second type antenna , The third type antenna and the fourth type antenna are located between a display panel and the substrate and connected to the back plate and the side plate.

In the aforementioned multi-antenna structure of the present invention for a mobile phone with a metal frame, the first type of antenna is an inverted F-shaped antenna made of a metal frame, and a set of high-pass filter circuits are arranged on the feed path.

In the aforementioned multi-antenna structure of the present invention for a mobile phone with a metal frame, the second type of antenna is a slotted antenna that uses a system ground extension path to couple an open path on the back of the system to achieve excitation.

In the aforementioned multi-antenna structure of the present invention for a mobile phone with a metal frame, the third type of antenna uses a monopole antenna fed into the metal frame for radiation and is connected in series with a low-pass filter circuit.

In the aforementioned multi-antenna structure of the present invention for a mobile phone with a metal frame, the fourth type antenna is a metal frame inverted F antenna with a short-circuit path added, and is equipped with a high-pass filter circuit.

In the aforementioned multi-antenna structure of the present invention for a mobile phone with a metal frame, the first type antenna is arranged on the end side of the substrate with a width of 7 mm, and the fourth type antenna is arranged on the length of the substrate with a thickness of 1 mm. Side.

In the aforementioned multi-antenna structure of the present invention for a mobile phone with a metal frame, the capacitance value of the first high-pass filter circuit is 1.2 pF and the inductance value is 8.2 nH; the capacitance value is 2.5 pF and the inductance value is 3.3 nH.

In the aforementioned multi-antenna structure of the present invention for a mobile phone with a metal frame, the capacitance value of the low-pass filter circuit is 0.75 pF and the inductance value is 3 nH.

In the aforementioned multi-antenna structure of the present invention for a mobile phone with a metal frame, the capacitance value of the second high-pass filter circuit is 0.75 pF and the inductance value is 2.4 nH.

Based on the above-mentioned advantages, and in order for the reviewer to have a better understanding of the present invention, a preferred embodiment is disclosed as follows. In conjunction with the drawings and figure numbers, the content of the present invention and the effects achieved by the present invention are described in detail below.

1: Multi-antenna structure with metal frame mobile phone

10: substrate

101: Backplane

102: side panel

11: Short side

12: Long side

20: The first type antenna

21: The first antenna

211: First interface

22: Fifth antenna

221: Fifth interface

23: The first high-pass filter circuit

30: The second type antenna

31: second antenna

311: second interface

32: sixth antenna

321: sixth interface

40: The third antenna

41: third antenna

411: third interface

42: seventh antenna

421: Seventh interface

43: Low-pass filter circuit

50: Fourth antenna

51: fourth antenna

511: fourth interface

52: Eighth antenna

521: Eighth Interface

53: The second high-pass filter circuit

FIG. 1 is a schematic diagram of a multi-antenna structure for a mobile phone with a metal frame according to Embodiment 1 of the present invention;

2 is a partial enlarged view of a multi-antenna structure for a mobile phone with a metal frame according to Embodiment 1 of the present invention;

FIG. 3 is a graph of the relationship between the S parameter of the return loss of the first type antenna and the frequency in the first embodiment of the present invention; FIG.

4 is a graph showing the relationship between the reflection coefficient of the return loss and the frequency of the second type antenna of the embodiment 1 of the present invention;

FIG. 5 is a graph showing the relationship between the reflection coefficient of the return loss and the frequency of the third type antenna of the embodiment 1 of the present invention;

6 is a graph showing the relationship between the reflection coefficient of the return loss and the frequency of the fourth type antenna of the embodiment 1 of the present invention;

FIG. 7 is a graph of the relationship between the parameter S of the capacitance change of the first type antenna and the frequency of the embodiment 1 of the present invention; FIG.

FIG. 8 is a graph showing the relationship between the real part impedance and the frequency when the Ca value of the first type antenna of the embodiment 1 of the present invention changes from 0.75 to 2pF;

9 is a graph showing the relationship between the imaginary part impedance versus frequency when the Ca value of the first type antenna of the embodiment 1 of the present invention changes from 0.75 to 2pF;

FIG. 10 is a graph showing the relationship between the parameter S of the capacitance change of the first type antenna and the frequency of the embodiment 2 of the present invention; FIG.

11 is a graph showing the relationship between the real part impedance and the frequency when the Cb value of the first type antenna of the second embodiment of the present invention is changed from 1.5 to 3.6pF;

12 is a graph showing the relationship between the imaginary part impedance and the frequency when the Cb value of the first type antenna of the second embodiment of the present invention changes from 0.75 to 3.6pF;

FIG. 13 is a graph of the relationship between the parameter S of the third antenna capacitance change and the frequency in the third embodiment of the present invention; FIG.

14 is a graph showing the relationship between the real part impedance and the frequency when the Cc value of the third type antenna of the third embodiment of the present invention is changed from 0.3 to 1.2pF;

15 is a graph showing the relationship between the imaginary part impedance versus frequency when the Cc value of the third type antenna of the third embodiment of the present invention is changed from 0.3 to 1.2pF;

16 is a graph of the relationship between the S parameter and the frequency when the inductance value of the first type antenna of the embodiment 4 of the present invention is changed from 1.8 to 5.6nH;

FIG. 17 is a graph showing the relationship between the real impedance versus frequency when the inductance value of the first type antenna of Embodiment 4 of the present invention is changed from 1.8 to 5.6nH;

18 is a graph showing the relationship between the imaginary part impedance versus frequency when the inductance value of the first type antenna of Embodiment 4 of the present invention is changed from 1.8 to 5.6nH;

19 is a graph of the relationship between the S parameter and the frequency when the inductance value of the first type antenna of the embodiment 5 of the present invention changes from 6 to 12nH;

20 is a graph showing the relationship between the real impedance versus frequency when the inductance value of the first type antenna of the embodiment 5 of the present invention changes from 6 to 12nH;

Fig. 21 is a graph showing the relationship between the imaginary part impedance versus frequency when the inductance value of the first type antenna of the fifth embodiment of the present invention is changed from 6 to 12nH

22 is a graph of the relationship between the S parameter and the frequency when the inductance value of the third type antenna of the embodiment 6 of the present invention changes from 2 to 4nH;

FIG. 23 is a graph showing the relationship between the real impedance versus frequency when the inductance value of the third type antenna of the sixth embodiment of the present invention changes from 2 to 4nH;

24 is a graph showing the relationship between the imaginary part impedance and the frequency when the inductance value of the third type antenna of the sixth embodiment of the present invention changes from 2 to 4nH;

25 is a schematic diagram of radiation of the first antenna, the second antenna, the third antenna, and the fourth antenna according to the embodiment of the present invention; and

FIG. 26 is a diagram of radiation patterns of the first antenna, the second antenna, the third antenna, and the fourth antenna according to the embodiment of the present invention.

The following are specific examples to illustrate the implementation of the present invention. Those familiar with the art can easily understand the other advantages and effects of the present invention from the content disclosed in this specification. In addition, the present invention can also be implemented or applied by other different specific embodiments, and various modifications and changes can be made without departing from the spirit of the present invention.

Please refer to Figures 1 and 2. Figure 1 is a schematic diagram of a multi-antenna structure for a mobile phone with a metal frame according to Embodiment 1 of the present invention; and Figure 2 is a multi-antenna structure for a mobile phone with a metal frame according to Embodiment 1 of the present invention Magnified view of the part.

As shown in Figure 1 and Figure 2, this creation provides a multi-antenna structure 1 for mobile phones with metal frames, combined with mobile phones used in fifth-generation mobile communication network (5G) applications, which is used for mobile phones with metal frames. The antenna structure 1 includes: a substrate 10, a first type antenna 20, a second type antenna 30, a third type antenna 40, and a fourth type antenna 50, which are divided into upper and lower parts in these antenna designs; The substrate 10 includes a back plate 101 and a side plate 102. Secondly, the first type antenna 20 is arranged on the short side 11 of the substrate 10 for transmitting and receiving a first frequency band. The first type antenna 20 includes a first antenna 21 and a fifth antenna 22. The five antennas 22 are arranged corresponding to the first antenna 21, the first antenna 21 is arranged on a first interface 211, the fifth antenna 22 is arranged on the fifth interface 221, and the first antenna 20 is made of metal An inverted F antenna formed by a frame, and a first high-pass filter circuit 23 is arranged on the feeding path. Furthermore, the second type antenna 30 is arranged on the short side 11 of the substrate 10 and adjacent to the first type antenna 20 for transmitting and receiving a second frequency band. The second type antenna 30 includes a second The antenna 31 and a sixth antenna 32 are arranged corresponding to the second antenna 31, the second antenna 31 is arranged on a second interface 311, and the sixth antenna 32 is arranged on the sixth interface On 321, the second type antenna 30 is a slotted antenna that uses a system ground extension path to couple to an open path on the back of the system. Furthermore, the third type antenna 40 is disposed on the long side 12 of the substrate 10 for transmitting and receiving a third frequency band. The third type antenna 40 includes a third antenna 41 and a seventh antenna 42, the The seventh antenna 42 is arranged corresponding to the third antenna 41, the third antenna 41 is arranged on a third interface 411, the seventh antenna 42 is arranged on the seventh interface 421, and the third antenna 40 is A monopole antenna fed into the metal frame radiation is used and a low-pass filter circuit 43 is connected in series. Next, the fourth type antenna 50 is arranged on the long side 12 of the mobile phone with a clearance area of 1 mm thick and is arranged adjacent to the third type antenna 40 for transmitting and receiving a fourth frequency band. The fourth type antenna 50 includes a A fourth antenna 51 and an eighth antenna 52. The eighth antenna 52 is arranged corresponding to the fourth antenna 51, the fourth antenna 51 is arranged on a fourth interface 511, and the eighth antenna 52 is arranged on the eighth interface 521 Above, the fourth type antenna 50 is a metal frame inverted F antenna with a short-circuit path added, and a second high-pass filter circuit 53 is configured. In addition, the first type antenna 20, the second type antenna 30, the third type antenna 40, and the fourth type antenna 50 are located between a display panel and the substrate 10 and are in contact with the back plate 101 and the side plate 102 Wherein, the size of the display panel is 77×158mm ² , and the system ground plane is composed ^{of FR4 with a size of 75×144mm 2} and a thickness of 0.8mm, and is set under the substrate 10.

Secondly, the fifth generation (5G) mobile communication technology aims to increase the overall network speed. 3.4~3.6GHz is the newly opened frequency band. The performance of the first antenna 21 covers the LET low frequency band (698~960MHz) and high frequency band (1710~ 2690MHz) and the new 5G frequency band. The second antenna 31, the third antenna 41 and the fourth antenna 51 all cover the new 5G frequency band. The multi-antenna structure 1 of the mobile phone with a metal frame of the present invention is integrated into the same 5G antenna. In the mobile phone, it has good performance in the evaluation of the transmission channel capacity. The 4×4 array has a transmission channel capacity of 19.4bps/Hz, and the 8×8 array has a transmission channel capacity of 38.6bps/Hz.

Please refer to FIG. 3, which is a graph showing the relationship between the S parameter of the return loss and the frequency of the first type antenna according to Embodiment 1 of the present invention.

As shown in Figure 3, the simulation and measurement results of the first antenna are consistent, and the matching performance meets a voltage standing wave ratio of 3.5:1, which is a qualified standard in an all-metal environment and covers the high work of LTE Frequency band (698~960MHz) and low operating frequency band (1710~2690MHz) and 5G New Radio (NR) frequency range 1 (FR1) n78 frequency band (3400~3600MHz). The first antenna has an inverted-F antenna with a high-pass filter circuit (HPC) having eight resonance modes in the required frequency band, and the long path of the inverted-F antenna resonates at 750MHz (mode 1), the inverted-F antenna The short path resonates at 2180MHz (mode 4), and the high-pass filter circuit and the capacitor are used to generate modes 2 and 3, respectively. In metal frame applications, open circuits are used on both sides of the metal frame, which results in a unipolar resonance mode (mode 5). In the same situation, the resonant path of the loop antenna (mode 6) is formed by coupling the metal frame on the long side, and the degree of impedance matching is adjusted by the high-pass filter circuit. The available resonance modes are increased (mode 7). Finally, the high-order mode of the inverted-F antenna (mode 8).

Please refer to FIGS. 4 to 6. FIG. 4 is a graph showing the relationship between the reflection coefficient of the return loss and the frequency of the second type antenna according to the first embodiment of the present invention; FIG. 5 is the third type antenna according to the first embodiment of the present invention A graph showing the relationship between the reflection coefficient of the return loss and the frequency; and FIG. 6 is a graph showing the relationship between the reflection coefficient of the return loss and the frequency of the fourth type antenna of the first embodiment of the present invention.

As shown in Figure 4 to Figure 6, Figure 4 shows the simulation and measured return loss of the second-type antenna slotted antenna; Figure 4 shows the third-type antenna monopole antenna connected to a metal frame with a low-pass filter circuit ; And Figure 6 shows the simulation and measurement return loss of the fourth type antenna metal frame inverted F antenna, the second type antenna, the third type antenna and the ground-like antenna completely cover 5G NR FR1 (5G New Radio Frequency Ranges 1, 5G new frequency range 1) n78 frequency band (3400~3600MHz).

Please refer to FIGS. 7-9. FIG. 7 is a graph of the relationship between the S parameter and the frequency of the first type antenna capacitance change of the first embodiment of the present invention; FIG. 8 is the first type antenna of the first embodiment of the present invention A graph showing the relationship between the real impedance versus frequency when the value of Ca changes from 0.75 to 2pF; and Figure 9 It is a graph showing the relationship between the imaginary part impedance and the frequency when the Ca value of the first type antenna of the first embodiment of the present invention changes from 0.75 to 2pF.

(pF)，從阻抗值可以看出當電容值改變時，可以控制長程演進(long-term evolution,LET)低頻帶的第一共振模態，當電容值增加時，1200MHz時的高阻抗原本會移至較低的頻率，從而調節該頻帶的阻抗，其中，藍色虛線代表0.75pF，紅色實線代表1.2pF，綠色虛線代表2pF。該第一型天線主要用於調節LTE低頻段的阻抗帶寬。 As shown in Figs. 7-9, the metal shielding effect can be eliminated through the first high-pass filter circuit 23, and the required capacitance and inductance can be converted from the thickness of the substrate to reduce the required impedance to 50 ohms. And the imaginary part impedance drops to 0 ohms. The value of Ca is the capacitance value, the value of Ca changes from 0.75 to 2

(pF). It can be seen from the impedance value that when the capacitance value changes, the first resonance mode in the low-frequency band of long-term evolution (LET) can be controlled. When the capacitance value increases, the high impedance at 1200MHz would have been Move to a lower frequency to adjust the impedance of this frequency band. The blue dashed line represents 0.75pF, the red solid line represents 1.2pF, and the green dashed line represents 2pF. The first type antenna is mainly used to adjust the impedance bandwidth of the LTE low frequency band.

Please refer to FIGS. 10 to 12. FIG. 10 is a graph of the relationship between the S parameter of the first type antenna capacitance change with respect to frequency according to Embodiment 2 of the present invention; FIG. 11 is a graph of the first type antenna according to Embodiment 2 of the present invention. A graph showing the relationship between the real impedance and the frequency when the capacitance value Cb changes from 1.5 to 3.6pF; Fig. 12 is a graph showing the relationship between the imaginary impedance and the imaginary impedance when the Cb value of the first-type antenna according to Embodiment 2 of the present invention changes from 0.75 to 3.6pF Graph of frequency relationship.

As shown in Figure 10 to Figure 12, the Cb value was changed from 1.5pF to 3.6pF, which changed the real and imaginary parts of the impedance. The results showed that the matching degree of the LTE low frequency (698~960MHz) frequency band can be changed.

Please refer to FIGS. 13-15. FIG. 13 is a graph of the relationship between the S parameter and the frequency of the third-type antenna capacitance change in the third embodiment of the present invention; FIG. 14 is the third-type antenna of the third embodiment of the present invention. The Cc value is changed from 0.3 to 1.2pF as a graph showing the relationship between the real impedance and the frequency; Fig. 15 is the third type antenna of the third embodiment of the present invention with the Cc value changing from 0.3 to 1.2pF and the imaginary impedance with respect to the frequency Graph of the relationship.

As shown in Figure 13 to Figure 15, the Cc value changes from 0.3 to 1.2pF. As the capacitance value increases, the corresponding resonance mode shifts to a lower frequency. The inductance value of 3.3nH is the best matching solution.

Please refer to FIGS. 16 to 18. FIG. 16 is a graph showing the relationship between the S parameter and the frequency when the inductance value of the first type antenna of the fourth embodiment of the present invention is changed from 1.8 to 5.6nH; FIG. 17 is an embodiment of the present invention The inductance value of the first type antenna of 4 is changed from 1.8 to 5.6nH. The graph of the relationship between the real impedance and the frequency; and FIG. 18 is the inductance value of the first type antenna of embodiment 4 of the present invention from 1.8nH to 1.8nH. 5.6nH imaginary part impedance vs. frequency graph.

As shown in Figure 16 to Figure 18, the inductance value of L2 has changed from 1.8 to 5.6nH. The results show that the first resonance mode mainly controls the impedance of the LTE low frequency band (850~900MHz), which is mainly used to control the impedance, and then adjust the frequency of this frequency band. Best match.

Please refer to FIGS. 19-21. FIG. 19 is a graph showing the relationship between the inductance value of the first type antenna of the fifth embodiment of the present invention and the S parameter versus frequency when the inductance value is changed from 6 to 12nH; FIG. 20 is the fifth embodiment of the present invention. The inductance value of the first type antenna is changed from 6nH to 12nH in a graph showing the relationship between the real impedance and the frequency; and FIG. 21 is the virtual inductance value of the first type antenna from 6nH to 12nH according to the fifth embodiment of the present invention. A graph showing the relationship between partial impedance and frequency.

As shown in Figure 19-21, the inductance value of L1 is changed from 6 to 12nH. The results show that the high impedance offset of inductor L1 can be controlled at about 1200MHz, and the impedance of 2580MHz is slightly adjusted. Inductors L2 and L1 have realized joint adjustment. The effect of LTE low frequency band (698~960MHz).

Please refer to FIGS. 22-24. FIG. 22 is a graph showing the relationship between the inductance value of the third-type antenna of the third antenna according to the sixth embodiment of the present invention and the S parameter versus the frequency when the inductance value is changed from 2 to 4nH; FIG. 23 is the sixth embodiment of the present invention. The inductance value of the third type antenna is changed from 2 to 4nH, the real part impedance versus frequency graph; and FIG. 24 is the virtual inductance value of the third type antenna of embodiment 6 from 2nH to 4nH A graph showing the relationship between partial impedance and frequency.

As shown in Figure 22 to Figure 24, the L3 inductance value is changed from 2nH to 4nH. When the inductance value is changed, no frequency deviation will occur, but the matching degree of the resonance mode is changed, and the result shows that the power is increased. The inductance will make the impedance of the imaginary part close to zero, and L3 can fine-tune the impedance of the imaginary part to achieve impedance matching optimization.

Please refer to FIG. 25, which is a schematic diagram of radiation of the first antenna, the second antenna, the third antenna, and the fourth antenna according to the embodiment of the present invention.

As shown in FIG. 25, corresponding to the radiation direction of a metal frame, the first antenna 21 has a -Z axis radiation direction; the second antenna 31 has a radiation direction along the +Y axis; the third antenna 41 is due to the system ground layer Contribution, corresponding to the outward direction of the metal frame on the long side, the radiation direction of the third antenna 41 is in the -Y axis direction; the fourth antenna 51 is located in a clearance area of 1 mm, and its radiation direction is along + Radiation in the YZ direction, the radiation directions of the first antenna 21, the second antenna 31, the third antenna 41, and the fourth antenna 51 are maintained independently, avoiding interference from radiation in the same frequency band, and effectively improving the multiple input multiple output (MIMO) antenna The transmission performance.

Please refer to FIG. 26, which is a radiation pattern diagram of the first antenna, the second antenna, the third antenna, and the fourth antenna according to the embodiment of the present invention.

As shown in Figure 26, the first antenna, the second antenna, the third antenna, and the fourth antenna have separate feed powers and can measure two-dimensional field patterns at 3500MHz. Therefore, different types can be used. Antenna and suitable high-pass filter circuit or low-pass filter circuit to realize multi-antenna field diversity.

The above-mentioned embodiments are merely examples for illustration, and the scope of rights claimed in the present invention should be subject to the scope of the patent application, rather than being limited to the above-mentioned embodiments.

1: Multi-antenna structure with metal frame mobile phone

10: substrate

101: Backplane

102: side panel

11: Short side

12: Long side

20: The first type antenna

21: The first antenna

211: First interface

22: Fifth antenna

221: Fifth interface

30: The second type antenna

31: second antenna

311: second interface

32: sixth antenna

321: sixth interface

40: The third antenna

41: third antenna

411: third interface

42: seventh antenna

421: Seventh interface

50: Fourth antenna

51: fourth antenna

511: fourth interface

52: Eighth antenna

521: Eighth Interface

Claims (8)

A multi-antenna structure for a mobile phone with a metal frame, comprising: a base plate, including a back plate and a side plate; a first type antenna, arranged on the short side of the base plate, for transmitting and receiving a first frequency band , The first type antenna includes a first antenna and a fifth antenna, the fifth antenna is disposed corresponding to the first antenna, the first antenna is disposed on a first interface, and the fifth antenna is disposed on the On the fifth interface; a second-type antenna, arranged on the short side of the substrate and adjacent to the first-type antenna, for transmitting and receiving a second frequency band, the second-type antenna including a second antenna And a sixth antenna, the sixth antenna is arranged corresponding to the second antenna, the second antenna is arranged on a second interface, the sixth antenna is arranged on the sixth interface; a third antenna is arranged On the long side of the substrate, for transmitting and receiving a third frequency band, the third antenna includes a third antenna and a seventh antenna, the seventh antenna is arranged corresponding to the third antenna, and the third antenna Is arranged on a third interface, the seventh antenna is arranged on the seventh interface; and a fourth type antenna is arranged on the long side of the substrate and is arranged adjacent to the third antenna for Transceiving a fourth frequency band, the fourth antenna includes a fourth antenna and an eighth antenna, the eighth antenna is set corresponding to the fourth antenna, the fourth antenna is set on a fourth interface, and the eighth antenna is set On the eighth interface; wherein, the first type antenna, the second type antenna, the third type antenna, and the fourth type antenna are located between a display panel and the substrate and are in contact with the back plate and the side plate And, the first type antenna is arranged on the end side of the substrate with a width of 7 mm, and the fourth type antenna is arranged on the long side of the substrate with a thickness of 1 mm. The multi-antenna structure for a mobile phone with a metal frame as described in item 1 of the scope of patent application, wherein the first type antenna is an inverted F-shaped antenna formed by using a metal frame, and a second antenna is arranged on the feed path A high-pass filter circuit. The multi-antenna structure for a mobile phone with a metal frame as described in the first item of the scope of patent application, wherein the second type of antenna uses a system ground extension path to couple an open path on the back of the system to achieve a slot for excitation Hole antenna. The multi-antenna structure for mobile phones with a metal frame as described in the first item of the scope of patent application, wherein the third type of antenna is a monopole antenna fed into the metal frame and connected in series with a low-pass filter circuit . The multi-antenna structure for a mobile phone with a metal frame as described in the first item of the patent application, wherein the fourth type antenna is a metal frame inverted F antenna with a short-circuit path added, and a second high-pass filter is provided Circuit. As described in item 2 of the scope of patent application, the multi-antenna structure for a mobile phone with a metal frame, wherein the capacitance value of the first high-pass filter circuit is 1.2pF corresponding to the inductance value of 8.2nH; the capacitance value is 2.5pF corresponding to the inductance The value is 3.3nH. As described in item 4 of the scope of patent application, the multi-antenna structure for a mobile phone with a metal frame, wherein the capacitance value of the low-pass filter circuit is 0.75 pF and the inductance value is 3 nH. As described in item 5 of the scope of patent application, the multi-antenna structure for a mobile phone with a metal frame, wherein the capacitance value of the second high-pass filter circuit is 0.75 pF and the inductance value is 2.4 nH.

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