Single-feed multi-band metal frame antenna and mobile phone

Abstract

The invention provides a single-feed multi-band metal frame antenna and a mobile phone, and the antenna comprises a metal frame which comprises a main frame and a radiation frame, the radiation frame is provided with a grounding rib position, and the grounding rib position is used for being electrically connected with a metal structure of a mobile phone housing; the feed end is connected with the radiation frame and is used for being electrically connected with a radio frequency combiner arranged on a mainboard of the mobile phone; the ground foot is connected with the radiation frame, and the feed end, the ground foot and the ground returning rib position are sequentially arranged in the extending direction of the radiation frame. Compared with the prior art, the single-feed multi-band metal frame antenna can adopt a single-feed design, is matched with a radio frequency combiner, realizes a multi-band antenna design on a radiation frame, can cover the requirements of a UHB frequency band, an L5 frequency band and a WIFI 5G frequency band, increases a working frequency band under the condition of not increasing gap positions, is beneficial to reducing the number of antennas and reducing the cost, and has a wide application prospect. And the antenna is formed by using the metal frame, so that the internal space of the mobile phone is not occupied.

Description

Technical Field

[0001] This invention relates to the field of technology, specifically to a single-fed multi-band metal frame antenna and a mobile phone. Background Technology

[0002] With the development of technology, mobile phones have evolved from external antennas to internal FPC antennas. Internal FPC antennas are made of a more flexible material, allowing for more flexible wiring and various wiring methods, resulting in higher space utilization. As people pursue the ultimate full-screen display, the new design style of metal-framed phones is refreshing, and many mobile phone manufacturers have begun to develop full-screen smartphones with metal frames.

[0003] However, mobile phone antennas are quite sensitive to metal. Metal frames can hinder the outward radiation of the built-in antenna, causing a sharp drop in the performance of the built-in antenna. In addition, the current built-in FPC antennas also take up extra internal space in the phone. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings and deficiencies of the prior art and provide a single-fed multi-band metal frame antenna and a mobile phone.

[0005] One embodiment of the present invention provides a single-fed multi-band metal frame antenna, comprising:

[0006] The metal frame includes a main frame and a radiating frame, which together form a protective space. The two ends of the main frame and the two ends of the radiating frame form a first gap and a second gap. The radiating frame is provided with a grounding rib, which is used for electrical connection with the metal structure of the mobile phone casing. The power supply terminal is connected to the radiating frame and is used to electrically connect to the radio frequency combiner disposed on the motherboard of the mobile phone. The foot is connected to the radial frame. The power supply terminal, the foot, and the return rib are arranged sequentially along the extension direction of the radial frame. The first gap is located on the side of the power supply terminal away from the foot. The portion of the radiating frame between the power supply terminal and the grounding anchor forms a first branch; the portion of the radiating frame between the end of the radiating frame near the first gap and the grounding anchor forms a second branch; and the portion of the radiating frame between the end of the radiating frame near the first gap and the grounding anchor position forms a third branch.

[0007] In some alternative implementations, the radial border forms an extension between the anchor and the return reinforcement position.

[0008] In some alternative implementations, the length of the first stub is 1 / 4 to 1 / 2 of the wavelength corresponding to the operating frequency band of the first stub.

[0009] In some alternative implementations, the length of the second stub is 1 / 4 to 1 / 2 of the wavelength corresponding to the operating frequency band of the second stub.

[0010] In some alternative implementations, the length of the third stub is 1 / 4 to 1 / 2 of the wavelength corresponding to the operating frequency band of the third stub.

[0011] In some alternative implementations, the operating frequency band corresponding to the first branch is the 5G Wi-Fi band.

[0012] In some alternative implementations, the operating frequency band corresponding to the second branch is the UHB band.

[0013] In some alternative implementations, the operating frequency band corresponding to the third branch is the L5 band.

[0014] Another embodiment of the present invention provides a mobile phone, including: a motherboard, a mobile phone housing metal structure, and a single-fed multi-band metal frame antenna as described above. The motherboard is arranged in the protective space. The motherboard is provided with an RF combiner, a first feed matching circuit, a second feed matching circuit, a third feed matching circuit, and a ground terminal. The feed terminal is electrically connected to the RF combiner. The RF combiner is electrically connected to the first feed matching circuit, the second feed matching circuit, and the third feed matching circuit. A portion of the mobile phone housing metal structure is located within the protective space, and the grounding rib is electrically connected to the mobile phone housing metal structure.

[0015] In some alternative embodiments, a clearance space is formed between the motherboard and the metal structure of the mobile phone casing to avoid functional components. The clearance space is located in the protective space and on one side of the radiating frame. The grounding rib and the power supply terminal are located on opposite sides of the clearance space.

[0016] In some optional embodiments, the metal structure of the mobile phone casing is provided with a connecting protrusion, and the grounding rib is provided with a connecting groove, the connecting protrusion extending into the connecting groove.

[0017] Compared to existing technologies, the single-fed multi-band metal frame antenna of the present invention can adopt a single-fed design, combined with an RF combiner, to realize a multi-band antenna design on the radiating frame, which can cover the needs of multiple frequency bands such as UHB, L5, and WIFI 5G. It increases the number of working frequency bands without increasing the gap position, which helps to reduce the number of antennas and reduce costs. Moreover, since the antenna is formed by using a metal frame, it does not occupy the internal space of the mobile phone.

[0018] To provide a clearer understanding of the present invention, the specific embodiments of the present invention will be described below in conjunction with the accompanying drawings. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of a single-fed multi-band metal frame antenna, a motherboard, and a mobile phone casing metal structure according to an embodiment of the present invention. Figure 2 This is a partial structural schematic diagram of a single-fed multi-band metal frame antenna, a motherboard, and a mobile phone casing metal structure according to an embodiment of the present invention. Figure 3 This is a schematic diagram of the S11 parameters of the UHB band, L5 band, and WiFi 5G band of the radiating frame according to an embodiment of the present invention; Figure 4 This is an antenna efficiency diagram of the UHB band, L5 band, and WiFi 5G band of the radiating frame according to an embodiment of the present invention; Figure 5 This is a partial exploded view of a single-fed multi-band metal frame antenna, a motherboard, and a mobile phone casing metal structure according to an embodiment of the present invention.

[0020] Explanation of reference numerals in the attached figures: 10. Metal frame; 11. Main frame; 12. Radial frame; 121. Grounding rib; 122. Extension section; 123. Connecting groove; 13. Protective space; 14. First gap; 15. Second gap; 20. Power supply end; 30. Foot; 40. Motherboard; 41. RF combiner; 42. Clearance space; 50. Metal structure of mobile phone casing; 51. Connecting protrusion. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. In the description of the present invention, unless otherwise stated, "a plurality of" means two or more, and "a number" means one or more. Furthermore, unless otherwise stated, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features.

[0022] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0023] In the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0024] In the description of this invention, references to terms such as "one embodiment," "some alternative implementations," or "some optional embodiments," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0025] Please see Figures 1 to 4 One embodiment of the present invention provides a single-fed multi-band metal frame 10-antenna, comprising: The metal frame 10 includes a main frame 11 and a radiating frame 12. The main frame 11 and the radiating frame 12 together form a protective space 13. The two ends of the main frame 11 and the two ends of the radiating frame 12 form a first gap 14 and a second gap 15. The radiating frame 12 is provided with a grounding rib 121, which is used to electrically connect with the metal structure 50 of the mobile phone casing. Feed terminal 20 is connected to the radiating frame 12 and is used to electrically connect to the radio frequency combiner 41 disposed on the motherboard 40 of the mobile phone. The foot 30 is connected to the radial frame 12. The feed end 20, the foot 30 and the return rib position 121 are arranged in sequence along the extension direction of the radial frame 12. The first gap 14 is located on the side of the feed end 20 away from the foot 30. The portion of the radiating frame 12 between the power supply terminal 20 and the ground foot 30 forms a first branch; the portion of the radiating frame 12 between the end of the radiating frame 12 near the first gap 14 and the ground foot 30 forms a second branch; and the portion of the radiating frame 12 between the end of the radiating frame 12 near the first gap 14 and the return rib position 121 forms a third branch.

[0026] The working principle of a single-fed multi-band metal frame 10-antenna according to an embodiment of the present invention is explained below: The RF combiner 41 can automatically call the operating frequency band supported by the antenna. The first stub, the second stub, and the third stub can meet the different operating frequency bands of the antenna. Therefore, the RF combiner 41 can automatically call the operating frequency bands corresponding to the first stub, the second stub, and the third stub as needed, thereby realizing a single-feed, common-stub, multi-band antenna design on the same radiating frame 12. This allows for the addition of operating frequency bands without occupying internal space of the mobile phone or increasing the gap position of the metal frame 10, maintaining the aesthetics of the mobile phone while meeting design requirements and saving costs.

[0027] Since the operating frequency band corresponding to the third segment is relatively small, the third segment needs to be long enough. However, due to its structural design, the motherboard 40 of the mobile phone cannot be grounded in the corresponding position. For example, in some positions, functional components such as cameras and microphones need to be placed, which requires the motherboard 40 to be designed to avoid them. Therefore, the grounding rib 121 on the radiating frame 12 is connected to the metal structure 50 of the mobile phone casing, so that the antenna part corresponding to the third segment can be grounded. This satisfies the grounding requirements without adding an additional grounding structure, and without changing the position layout of the motherboard 40 and other functional components for grounding.

[0028] The working principle and structure of the radio frequency combiner 41 are well known to those skilled in the art and will not be described in detail here.

[0029] In some alternative implementations, the radiating frame 12 forms an extension 122 between the ground foot 30 and the return ground rib 121, thereby extending the distance between the return ground rib 121 and the feed point sufficiently to lengthen the current path and meet the antenna length design requirements.

[0030] In some alternative implementations, the length of the first stub is 1 / 4 to 1 / 2 of the wavelength corresponding to the operating frequency band of the first stub. The length of the first stub is determined based on its operating frequency band, and the relative positions of the feed terminal 20 and the ground pin 30 can be determined accordingly.

[0031] In some alternative embodiments, the length of the second stub is 1 / 4 to 1 / 2 of the wavelength corresponding to the operating frequency band of the second stub. The length of the second stub is determined based on its operating frequency band, and the relative positions between the ground foot 30, the feed terminal 20, and the first slot 14 can be determined accordingly.

[0032] In some alternative embodiments, the length of the third stub is 1 / 4 to 1 / 2 of the wavelength corresponding to the operating frequency band of the third stub. The length of the third stub is determined based on the operating frequency band of the third stub, and the relative positions between the grounding rib 121, the feed terminal 20, and the first gap 14 can be determined accordingly.

[0033] In some optional implementations, the operating frequency band corresponding to the first branch is the Wi-Fi 5G band. The Wi-Fi 5G band corresponds to the operating frequency band of 5.15-7GHz. Of course, the length of the first branch can also be adjusted as needed to meet the requirements of other operating frequency bands.

[0034] In some optional implementations, the second stub operates in the UHB band. The UHB band corresponds to an operating frequency of 3.3-4.2 GHz. Of course, the length of the second stub can be adjusted as needed to meet the requirements of other operating frequency bands.

[0035] In some optional implementations, the operating frequency band corresponding to the third stub is the L5 band. The L5 band corresponds to an operating frequency of 1.17 GHz. Of course, the length of the third stub can also be adjusted as needed to meet the requirements of other operating frequency bands.

[0036] The radiating frame 12 can achieve multi-band coverage of L5, WiFi 5G and UHB, meeting the design requirements of multi-band antennas.

[0037] In this embodiment, the radial frame 12 is a straight strip with an approximate length of 23.7 mm and an approximate width of 0.8 mm.

[0038] The aforementioned single-fed multi-band metal frame antenna 10 can be applied to a mobile phone. The mobile phone includes: a motherboard 40, a mobile phone casing metal structure 50, and the aforementioned single-fed multi-band metal frame antenna 10. The motherboard 40 is arranged in a protective space 13. The motherboard 40 is equipped with an RF combiner 41, a first feed matching circuit, a second feed matching circuit, a third feed matching circuit, and a ground terminal. The feed terminal 20 is electrically connected to the RF combiner 41, and the RF combiner 41 is electrically connected to the first, second, and third feed matching circuits. A portion of the mobile phone casing metal structure 50 is located within the protective space 13, and the grounding rib 121 is electrically connected to the mobile phone casing metal structure 50. Because part of the mobile phone casing structure is made of metal, such as the mid-frame or rear frame, the mobile phone casing metal structure 50 can be a part of the mid-frame or rear frame structure, etc., depending on the actual structural design.

[0039] In some alternative implementations, a clearance space 42 is formed between the motherboard 40 and the metal structure 50 of the phone casing to avoid functional components. The clearance space 42 is located within the protective space 13 and on one side of the radiating frame 12. The grounding rib 121 and the feed terminal 20 are located on opposite sides of the clearance space 42. Due to the operating frequency band design of the third stub, its length is relatively long, allowing it to cross the clearance space 42. However, this would prevent it from connecting to the motherboard 40 for grounding. Therefore, the metal structure 50 of the phone casing is used to achieve grounding. In this way, the motherboard 40 can meet both the conventional clearance requirements and the antenna design requirements.

[0040] The functional components (not shown) can be cameras, microphones, etc., and are arranged within the clearance space 42.

[0041] Please see Figure 5 In some optional embodiments, a connecting protrusion 51 is provided on the metal structure 50 of the mobile phone casing, and a connecting groove 123 is provided on the grounding rib position 121. The connecting protrusion 51 extends into the connecting groove 123. The connecting protrusion 51 and the connecting groove 123 cooperate to achieve stable positioning, thereby achieving stable assembly of the grounding rib position 121 and the metal structure 50 of the mobile phone casing.

[0042] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A single-fed multi-band metal frame antenna, characterized in that, include: The metal frame includes a main frame and a radiating frame, which together form a protective space. The two ends of the main frame and the two ends of the radiating frame form a first gap and a second gap. The radiating frame is provided with a grounding rib, which is used for electrical connection with the metal structure of the mobile phone casing. The power supply terminal is connected to the radiating frame and is used to electrically connect to the radio frequency combiner disposed on the motherboard of the mobile phone. The foot is connected to the radial frame. The power supply terminal, the foot, and the return rib are arranged sequentially along the extension direction of the radial frame. The first gap is located on the side of the power supply terminal away from the foot. The portion of the radiating frame between the power supply terminal and the grounding anchor forms a first branch; the portion of the radiating frame between the end of the radiating frame near the first gap and the grounding anchor forms a second branch; and the portion of the radiating frame between the end of the radiating frame near the first gap and the grounding anchor position forms a third branch.

2. The single-fed multi-band metal frame antenna according to claim 1, characterized in that: The radial frame forms an extension between the base and the return reinforcement position.

3. The single-fed multi-band metal frame antenna according to claim 1, characterized in that: The length of the first stub is 1 / 4 to 1 / 2 of the wavelength corresponding to the operating frequency band of the first stub; The length of the second stub is 1 / 4 to 1 / 2 of the wavelength corresponding to the operating frequency band of the second stub; The length of the third branch is 1 / 4 to 1 / 2 of the wavelength corresponding to the operating frequency band of the third branch.

4. A single-fed multi-band metal frame antenna according to any one of claims 1 to 3, characterized in that: The operating frequency band corresponding to the first branch is the 5G Wi-Fi band.

5. A single-fed multi-band metal frame antenna according to any one of claims 1 to 3, characterized in that: The operating frequency band corresponding to the second branch is the UHB band.

6. A single-fed multi-band metal frame antenna according to any one of claims 1 to 3, characterized in that: The operating frequency band corresponding to the third branch is the L5 band.

7. A mobile phone, characterized in that, include: The system comprises a motherboard, a mobile phone casing metal structure, and a single-fed multi-band metal frame antenna as described in any one of claims 1 to 6. The motherboard is arranged in the protective space. The motherboard is provided with an RF combiner, a first feed matching circuit, a second feed matching circuit, a third feed matching circuit, and a ground terminal. The feed terminal is electrically connected to the RF combiner. The RF combiner is electrically connected to the first feed matching circuit, the second feed matching circuit, and the third feed matching circuit. A portion of the mobile phone casing metal structure is located within the protective space, and the grounding rib is electrically connected to the mobile phone casing metal structure.

8. A mobile phone according to claim 7, characterized in that: A clearance space is formed between the motherboard and the metal structure of the mobile phone casing to avoid functional components. The clearance space is located in the protective space and on one side of the radiating frame. The grounding rib and the power supply terminal are located on opposite sides of the clearance space.

9. A mobile phone according to claim 7, characterized in that: The metal structure of the mobile phone casing is provided with a connecting protrusion, and the grounding rib is provided with a connecting groove, and the connecting protrusion extends into the connecting groove.

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