Metal frame mobile phone antenna and metal frame mobile phone

Abstract

The invention provides a metal frame mobile phone antenna and a metal frame mobile phone. The metal frame mobile phone antenna comprises a metal frame, a first feed end, a second feed end, a third feed end and a filter module connecting end, the metal frame is provided with a first breaking joint and a second breaking joint, and the metal frame is divided by the first breaking joint and the second breaking joint to form an enclosing side frame and a radiation side frame; the first feed end, the second feed end and the third feed end are electrically connected with the radiation side frame in sequence; the filtering module connecting end is used for being connected with a grounding end through a filtering module on a mobile phone mainboard, and the filtering module connecting end is electrically connected with the radiation side frame. According to the mobile phone antenna with the metal frame, the common-branch antenna design on the metal frame is achieved under the condition that breaking joints are not increased, the multi-antenna multi-band performance is achieved, and the filtering module is used for filtering high frequency so as to improve the antenna efficiency.

Description

Technical Field

[0001] The invention belongs to the technical field of antennas, and in particular relates to a metal frame mobile phone antenna and a metal frame mobile phone. Background Art

[0002] Most modern mobile phone terminal antennas are built-in antennas. For mobile phones with metal frames, the common method in the industry is to make antennas made of FPC or LDS materials on antenna brackets, and then place them inside the mobile phone for signal radiation. However, the metal frame has the effect of shielding the signal. The metal frame will hinder the built-in antenna of the mobile phone from radiating outward, resulting in a sharp decline in the performance of the built-in antenna of the mobile phone. Therefore, in the existing design, a part of the metal middle frame is cut off to form a breakpoint to improve the signal reception capability and stability. However, too many breaks can easily lead to potential signal interference points, increase interference between signals, and affect communication quality. Therefore, how to achieve multiple antennas on a metal frame while minimizing the number of breakpoints has important design significance for the development of metal-framed mobile phones. Summary of the invention

[0003] The purpose of the present invention is to overcome the shortcomings and deficiencies in the prior art and provide a metal frame mobile phone antenna, which realizes the common branch antenna design on the metal frame without adding fractures, realizes multi-antenna multi-band performance, and uses a filtering module to filter high frequencies to improve antenna efficiency.

[0004] The present invention is achieved through the following technical solutions:

[0005] A metal frame mobile phone antenna comprises a metal frame, a first feed end, a second feed end, a third feed end and a filter module connection end; the metal frame is provided with a first break and a second break, and the metal frame is separated by the first break and the second break to form an enclosing side frame and a radiation side frame; the first feed end, the second feed end and the third feed end are electrically connected to the radiation side frame in sequence; the filter module connection end is used to be connected to a ground end through a filter module on a mobile phone mainboard, and the filter module connection end is electrically connected to the radiation side frame.

[0006] The present invention provides a mobile phone antenna with a metal frame. The metal frame is separated by a first break and a second break to form an enclosed side frame and a radiation side frame. The radiation side frame can respectively form three antenna loops with a first feeding end, a second feeding end and a third feeding point. The common branch antenna design on the metal frame is realized without adding breaks, and multi-antenna multi-band performance is achieved. The filter module connection end is connected to the filter module on the mobile phone mainboard and grounded to filter noise to improve antenna efficiency.

[0007] Furthermore, the length of the radiation side frame between the first feed end and the filter module connection end is 1 / 4-1 / 2 of the working frequency band of the first feed end; the length of the radiation side frame between the second feed end and the filter module connection end is 1 / 4-1 / 2 of the working frequency band of the second feed end; the length of the radiation side frame between the third feed end and the filter module connection end is 1 / 4-1 / 2 of the working frequency band of the third feed end. According to the matching frequency of the first feed end, the second feed end and the third feed end, the length of the radiation side frame of the common branch node is limited, and the relative positions of the first feed end, the second feed end and the third feed end can be determined accordingly.

[0008] Furthermore, the working frequency of the first feed end is the UHB band; the working frequency band of the second feed end is the L5 band; and the working frequency band of the third feed end is the MHB band. The metal frame design of the common branch node can achieve coverage of multiple frequency bands including ultra-high frequency, L5, and medium-high frequency.

[0009] Further, the connection end of the filter module is located between the first feed end and the second feed end; or, the connection end of the filter module is located between the second feed end and the third feed end.

[0010] Furthermore, the radiation side frame is in a straight line or arc shape. According to the working frequency bands of the first feeding end, the second feeding end and the third feeding end, the radiation side frame part used for common branch node radiation can be designed at the side or top corner position of the metal frame.

[0011] The present invention also provides a metal frame mobile phone, comprising a mobile phone mainboard and the above-mentioned metal frame mobile phone antenna; the mobile phone mainboard is arranged in the metal frame, and a first feed matching circuit, a second feed matching circuit, a third feed matching circuit, a filter module and a grounding terminal are arranged on the mobile phone mainboard; the first feed terminal of the metal frame mobile phone antenna is electrically connected to the first feed matching circuit, the second feed terminal is electrically connected to the second feed matching circuit, and the third feed terminal is electrically connected to the third feed matching circuit; the filter module is arranged on the mobile phone mainboard, the filter module connection end is electrically connected to the filter module, and the filter module is electrically connected to the grounding terminal.

[0012] In the metal frame mobile phone provided by the present invention, the metal frame is separated by the first break and the second break to form an enclosing side frame and a radiating side frame. The radiating side frame is used for common branch antenna radiation and is connected with the first feeding end, the second feeding end, and the third feeding end to form an antenna loop of three frequency bands. The multi-band multi-antenna design requirements are achieved without increasing the number of breaks, the number of antennas in the mobile phone is reduced, and it is conducive to the lightweight design of the mobile phone.

[0013] Furthermore, the filter module is a 33PF capacitor. The 33PF capacitor is selected for filtering to reduce electromagnetic interference.

[0014] For better understanding and implementation, the present invention is described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of the metal frame mobile phone antenna of Example 1.

[0016] Figure 2 It is an S11 parameter diagram of the first feeding end 2UHB frequency band and the second feeding end 3L5 frequency band of Example 1.

[0017] Figure 3 3 is a diagram of the antenna efficiency of the first feeding end 2 in the UHB band of the embodiment 1.

[0018] Figure 4 3 is an antenna efficiency diagram of the second feeding end 3 of the first embodiment in the L5 frequency band.

[0019] Figure 5 It is a S11 parameter diagram of the MHB frequency band of the third feeding terminal 4 of Example 1.

[0020] Figure 6 4 is an antenna efficiency diagram of the third feeding terminal 4 of the first embodiment in the MHB frequency band.

[0021] Figure 7 It is a structural schematic diagram of the metal frame mobile phone of Example 2. DETAILED DESCRIPTION

[0022] The embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the embodiments of the present invention, rather than to limit the embodiments of the present invention. It is also necessary to explain that, for ease of description, only parts related to the embodiments of the present invention are shown in the accompanying drawings, rather than all structures.

[0023] In addition, the terms first, second, third, etc. in the specification and claims are only used for the purpose of describing the same technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated, nor necessarily describing the order or time sequence. The terms are interchangeable where appropriate. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features.

[0024] Similarly, the terms "fixed" and "connected" used in the specification and claims should not be construed as limited to direct connection. Therefore, the expression "device A is connected to device B" should not be limited to a device or system in which device A is directly connected to device B, but means that there is a path between device A and device B, which may be a path including other devices or tools.

[0025] Example 1

[0026] This embodiment provides a metal frame mobile phone antenna. Figure 1 This is a schematic diagram of the structure of a metal frame mobile phone antenna. Figure 1 The metal frame mobile phone antenna includes a metal frame 1, a first feed terminal 2, a second feed terminal 3, a third feed terminal 4 and a filter module connection terminal 5; a first break 13 and a second break 14 are provided on the metal frame 1, and the metal frame 1 is separated by the first break 13 and the second break 14 to form an enclosing side frame 11 and a radiation side frame 12; the first feed terminal 2, the second feed terminal 3 and the third feed terminal 4 are electrically connected to the radiation side frame 12 in sequence; the filter module connection terminal 5 is used to connect to the ground terminal through the filter module 9 on the mobile phone motherboard 10, and the filter module 9 is electrically connected to the radiation side frame 12.

[0027] In the metal frame mobile phone antenna provided in this embodiment, the first break 13 and the second break 14 are used to improve the radiation intensity. The metal frame 1 is separated by the first break 13 and the second break 14 to form an enclosing side frame 11 and a radiating side frame 12. The radiating side frame 12 can form three antenna loops with the first feeding terminal 2, the second feeding terminal 3 and the third feeding terminal 4 respectively. The co-branch antenna design on the metal frame 1 is realized without adding breaks, and multi-antenna multi-band performance is achieved. The filtering module 9 is used to filter high frequencies to improve the antenna efficiency.

[0028] In the metal frame mobile phone antenna of this embodiment, the first feed terminal 2, the second feed terminal 3 and the third feed terminal 4 share the same section of the metal frame between the first break 13 and the second break 14, and use the filter module connection terminal 5 to share the grounding point, thereby realizing antenna communication in the 1.176GHz, 1.7-2.7GHz and 3.3-5GHz frequency bands, and achieving multi-antenna multi-band performance without increasing breaks or increasing the internal space occupied by the terminal.

[0029] In this embodiment, the length of the radiation side frame 12 between the first feed terminal 2 and the filter module connection terminal 5 is 1 / 4-1 / 2 of the working frequency band of the first feed terminal 2; the length of the radiation side frame 12 between the second feed terminal 3 and the filter module connection terminal 5 is 1 / 4-1 / 2 of the working frequency band of the second feed terminal 3; the length of the radiation side frame 12 between the third feed terminal 4 and the filter module connection terminal 5 is 1 / 4-1 / 2 of the working frequency band of the third feed terminal 4. According to the matching frequency of the first feed terminal 2, the second feed terminal 3 and the third feed terminal 4, the length of the radiation side frame 12 of the common branch node is limited, and the relative positions of the first feed terminal 2, the second feed terminal 3 and the third feed terminal 4 can be determined accordingly.

[0030] In this embodiment, the working frequency of the first feed terminal 2 is the UHB band; the working frequency band of the second feed terminal 3 is the L5 band; and the working frequency band of the third feed terminal 4 is the MHB band. The design of the metal frame 1 with common branches can achieve coverage of multiple frequency bands including ultra-high frequency, L5, and medium-high frequency. That is, the first feed terminal 2, the radiation side frame 12, the filter module connection terminal 5, and the filter module and ground terminal on the mobile phone motherboard 10 form a first antenna loop with a resonant frequency band of the UHB band; the second feed terminal 3, the radiation side frame 12, the filter module connection terminal 5, and the filter module and ground terminal on the mobile phone motherboard 10 form a second antenna loop with a resonant frequency band of the L5 band; the third feed terminal 4, the radiation side frame 12, the filter module connection terminal 5, and the filter module and ground terminal on the mobile phone motherboard 10 form a third antenna loop with a resonant frequency band of the MHB band.

[0031] In this embodiment, the filter module connection terminal 5 is located between the first feed terminal 2 and the second feed terminal 3 ; or, the filter module connection terminal 5 is located between the second feed terminal 3 and the third feed terminal 4 .

[0032] In this embodiment, the filter module connection terminal 5 is connected to the filter module 9, and the filter module 9 is a 33PF capacitor to reduce electromagnetic interference.

[0033] See also Figure 1 In this embodiment, the radiation side frame 12 is in a straight line or arc shape. According to the working frequency bands of the first feed terminal 2, the second feed terminal 3 and the third feed terminal 4, the radiation side frame 12 part used for common branch node radiation can be designed at the side or vertex position of the metal frame 1. In this embodiment, according to the wavelengths corresponding to the UHB band, the L5 band and the MHB band, the optimal length of the radiation side frame 12 of the common branch node is obtained, so the radiation side frame 12 is set at the vertex position, the first break 13 is located on the side of the first feed terminal 2 away from the filter module 9, and the second break 14 is located on the side of the third feed terminal 4 away from the filter module 9.

[0034] Specifically, the distance between the first break 13 and the first feed terminal 2 is 1.4 mm, that is, the length of the radiation side frame 12 between the first break 13 and the first feed terminal 2 is 1.4 mm; the distance between the first break 13 and the vertex 15 of the metal frame 1 close to the first feed terminal 2 is 16.4 mm; the distance between the first feed terminal 2 and the vertex 15 of the metal frame 1 close to the first feed terminal 2 is 15 mm; the distance between the second feed terminal 3 and the vertex 15 of the metal frame 1 close to the first feed terminal 2 is 5.8 mm.

[0035] The distance between the second break 14 and the third feeding terminal 4 is 4 mm, that is, the length of the radiation side frame 12 between the second break 14 and the third feeding terminal 4 is 4 mm; the distance between the second break 14 and the filter module 9 is 19 mm, that is, the length of the radiation side frame 12 between the second break 14 and the filter module 9 is 19 mm; the distance between the second break 14 and the top corner 15 of the metal frame 1 close to the first break 13 is 30.7 mm.

[0036] In this embodiment, both the first slit 13 and the second slit 14 are filled with an insulator.

[0037] Figure 2 This is the S11 parameter diagram for the UHB band of the first feed end 2 and the L5 band of the second feed end 3. Please refer to Figure 2 The return loss in the UHB band of 3GHz-6GHz is (-10)~(-2)dB, and the return loss at the center frequency of 1.17GHz in the L5 band is -5.7dB, and the impedance matching is good.

[0038] Figure 3 This is the antenna efficiency diagram of the UHB band of the first feed end 2, please refer to Figure 3 , the antenna efficiency in the UHB band of 3GHz-6GHz is (-8)~(-3.5)dB.

[0039] Figure 4 This is the antenna efficiency diagram of the L5 frequency band of the second feeding end 3, please refer to Figure 4 , the antenna efficiency at the center frequency of the L5 band is 1.17GHz and is -9.3dB.

[0040] Figure 5 This is the S11 parameter diagram of the MHB band of the third feed terminal 4, please refer to Figure 5 , the return loss in the MHB band of 1.5GHz-3.0GHz is -11.8dB.

[0041] Figure 6 This is the antenna efficiency diagram of the MHB band of the third feed end 4, please refer to Figure 6 , the antenna efficiency in the MHB band of 1.5GHz-3.0GHz is -2.3dB.

[0042] Example 2

[0043] This embodiment also provides a metal frame mobile phone, Figure 7 This is a schematic diagram of the structure of a metal frame mobile phone. Please refer to Figure 1 and Figure 7The metal frame mobile phone includes a mobile phone mainboard 10 and the metal frame mobile phone antenna of Example 1; the mobile phone mainboard 10 is arranged in the metal frame 1, and the mobile phone mainboard 10 is provided with a first feed matching circuit 6, a second feed matching circuit 7, a third feed matching circuit 8, a filter module 9 and a ground terminal; the first feed terminal 2 of the metal frame mobile phone antenna is electrically connected to the first feed matching circuit 6, the second feed terminal 3 is electrically connected to the second feed matching circuit 7, and the third feed terminal 4 is electrically connected to the third feed matching circuit 8, the filter module 9 is arranged on the mobile phone mainboard 10, the filter module connection terminal 5 is electrically connected to the filter module 9, and the filter module 9 is electrically connected to the ground terminal.

[0044] In the metal frame mobile phone provided in this embodiment, the metal frame 1 is separated by the first break 13 and the second break 14 to form an enclosing side frame 11 and a radiating side frame 12. The radiating side frame 12 is used for common branch antenna radiation, and is connected with the first feeding terminal 2, the second feeding terminal 3, and the third feeding terminal 4 to form an antenna loop of three frequency bands. The multi-band multi-antenna design requirements are achieved without increasing the number of breaks, the number of antennas in the mobile phone is reduced, and it is conducive to the lightweight design of the mobile phone.

[0045] In this embodiment, the filter module 9 is a 33PF capacitor.

[0046] The present invention is not limited to the above-mentioned embodiments. If various changes or modifications to the present invention do not depart from the spirit and scope of the present invention, and if these changes and modifications fall within the scope of the claims and equivalent technologies of the present invention, the present invention is also intended to include these changes and modifications.

Claims

1. A metal frame mobile phone antenna, characterized in that: It includes a metal frame, a first feeding end, a second feeding end, a third feeding end and a filter module connecting end; The metal frame is provided with a first break and a second break, and the metal frame is divided by the first break and the second break to form an enclosing side frame and a radiation side frame; The first feeding end, the second feeding end and the third feeding end are electrically connected to the radiation side frame in sequence; the filter module connection end is used to connect to the ground end through the filter module on the mobile phone motherboard, and the filter module connection end is electrically connected to the radiation side frame; The first slit and the second slit are both filled with an insulator.

2. The metal frame mobile phone antenna according to claim 1, characterized in that: The length of the radiation side frame between the first feeding end and the connection end of the filter module is 1 / 4-1 / 2 of the working frequency band of the first feeding end; The length of the radiation side frame between the second feeding end and the connection end of the filter module is 1 / 4-1 / 2 of the working frequency band of the second feeding end; The length of the radiation side frame between the third feeding end and the filter module connection end is 1 / 4-1 / 2 of the working frequency band of the third feeding end.

3. The metal frame mobile phone antenna according to claim 2, characterized in that: The operating frequency of the first feeding end is the UHB frequency band; the operating frequency band of the second feeding end is the L5 frequency band; and the operating frequency band of the third feeding end is the MHB frequency band.

4. The metal frame mobile phone antenna according to claim 2, characterized in that: The filter module connection end is located between the first feed end and the second feed end; or, the filter module connection end is located between the second feed end and the third feed end.

5. The metal frame mobile phone antenna according to claim 1, characterized in that: The radiation side frame is in a straight line or arc shape.

6. A metal frame mobile phone, characterized in that: It comprises a mobile phone mainboard and the metal frame mobile phone antenna according to any one of claims 1 to 5; the mobile phone mainboard is arranged in the metal frame, and the mobile phone mainboard is provided with a first feed matching circuit, a second feed matching circuit, a third feed matching circuit, a filter module and a ground terminal; The first feeding end of the metal frame mobile phone antenna is electrically connected to the first feeding matching circuit, the second feeding end is electrically connected to the second feeding matching circuit, and the third feeding end is electrically connected to the third feeding matching circuit; the filter module is arranged on the mobile phone mainboard, the filter module connection end is electrically connected to the filter module, and the filter module is electrically connected to the ground end.

7. The metal frame mobile phone according to claim 6, characterized in that: The filter module is a 33PF capacitor.

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