All-metal cavity multi-frequency antenna and mobile terminal

Abstract

The utility model discloses an all-metal cavity multi-frequency antenna and a mobile terminal, and relates to the technical field of antennae, the all-metal cavity multi-frequency antenna comprises a metal shell, a resonance piece and an antenna small plate, the metal shell comprises a first shell installed on the outer edge of a display screen and a second shell installed on the outer edge of the mobile terminal, the second shell comprises a bottom shell extending in the horizontal direction and a side shell perpendicular to the bottom shell, the first shell and the bottom shell are arranged in parallel, a resonant cavity is defined by the first shell and the second shell, and a radiation part extending in the horizontal direction is arranged between the first shell and the side shell; the resonant piece is installed in the resonant cavity, located between the first shell and the bottom shell and coupled with the first shell and the second shell. The antenna small plate is installed on the side, facing the bottom shell, of the resonance piece and provided with a feed ejector pin, a matching circuit, an antenna port, a radio frequency connector, a first feed ground ejector pin connected with the bottom shell and a second feed ground ejector pin installed on the side, facing the resonance piece, of the antenna small plate and connected with the resonance piece, wherein the feed ejector pin, the matching circuit, the antenna port and the radio frequency connector are electrically connected with one another.

Description

Technical Field

[0001] The utility model relates to the technical field of antennas, and particularly relates to a full-metal cavity multi-frequency antenna and a mobile terminal. Background Art

[0002] With the rapid development of society, people's aesthetic level is getting higher and higher, and various mobile electronic devices are iterating and emerging, showing a trend of extending towards all-metal body electronic devices. For an antenna, the antenna is a transceiver conversion device for electromagnetic waves. The higher the frequency of the electromagnetic wave, the weaker its ability to penetrate metal and the stronger its ability to reflect signals. Therefore, in product design, metal has always been an insurmountable barrier for antennas. How to debug the required resonant electromagnetic wave frequency band in a metal body or an all-metal body, and how to make its electromagnetic wave signal be excited to a greater extent are difficult problems that antennas need to overcome in recent years.

[0003] At present, all traditional antenna design schemes require a large plastic clearance area. Otherwise, the bandwidth of the antenna will become extremely small and the efficiency will be extremely low, unable to meet the product design requirements of an all-metal body. Summary of the Utility Model

[0004] The main purpose of the utility model is to propose a full-metal cavity multi-frequency antenna and a mobile terminal, aiming to improve the bandwidth and efficiency of the antenna when it is arranged in an all-metal body as much as possible.

[0005] To achieve the above purpose, the full-metal cavity multi-frequency antenna proposed by the utility model includes:

[0006] A metal shell, which includes a first shell and a second shell. The first shell is installed on the outer edge of the display screen of the mobile terminal, and the second shell is installed on the outer edge of the mobile terminal. The second shell includes a bottom shell extending in the horizontal direction and a side shell perpendicular to the bottom shell. The first shell is arranged parallel to the bottom shell and encloses a resonant cavity with the second shell. A radiation part extending in the horizontal direction is arranged between the first shell and the side shell;

[0007] A resonant sheet, which is installed in the resonant cavity and is located between the first shell and the bottom shell, and is coupled with the first shell and the second shell respectively;

[0008] An antenna small board, which is installed on the side of the resonant sheet facing the bottom shell. The antenna small board is provided with a feeding top pin, a matching circuit, an antenna port, a radio frequency connector, a first ground feeding top pin and a second ground feeding top pin. The radio frequency connector, the antenna port, the matching circuit and the feeding top pin are electrically connected. The first ground feeding top pin is connected to the bottom shell, and the second ground feeding top pin is installed on the side of the antenna small board facing the resonant sheet and is connected to the resonant sheet.

[0009] In one embodiment, the all-metal cavity multi-band antenna further includes a mounting frame, which is mounted in the second housing and connected to the second housing, and the first housing and the radiation part are mounted on the top of the mounting frame.

[0010] In one embodiment, the resonant sheet includes a planar portion, a first coupling portion, and a second coupling portion. The planar portion has a first side end and a second side end adjacent to the first side end. The first side end extends and bends towards the second housing to form the first coupling portion, and the second side end extends and bends towards the second housing to form the second coupling portion. The first coupling portion and the second coupling portion are coupled to the second housing.

[0011] In one embodiment, a first laser engraving portion and a second laser engraving portion are formed on one side of the second housing facing the resonant sheet. The first laser engraving portion is coupled to the first coupling portion, and the second laser engraving portion is coupled to the second coupling portion.

[0012] In one embodiment, the planar portion is provided with a plurality of first fixing holes, and the mounting frame is provided with a plurality of second fixing holes. One of the first fixing holes corresponds to one of the second fixing holes, and the resonant sheet and the mounting frame are fixedly connected by sequentially passing a fixing screw through the first fixing hole and the second fixing hole.

[0013] In one embodiment, the mounting frame is provided with a first positioning post, and the antenna small board is provided with a first positioning hole. One of the first positioning posts is inserted into one of the first positioning holes.

[0014] In one embodiment, the mounting frame is further provided with a second positioning post, and the resonant sheet is formed with a second positioning hole. One of the second positioning posts is inserted into one of the second positioning holes.

[0015] In one embodiment, the material of the resonant sheet is one of copper, aluminum, and stainless steel. The present invention also provides a mobile terminal, which includes an all-metal cavity multi-band antenna, and the all-metal cavity multi-band antenna includes:

[0016] A metal shell, which includes a first housing and a second housing. The first housing is mounted on the outer edge of the display screen of the mobile terminal, and the second housing is mounted on the outer edge of the mobile terminal. The second housing includes a bottom shell extending in the horizontal direction and a side shell perpendicular to the bottom shell. The first housing is arranged parallel to the bottom shell and encloses a resonant cavity with the second housing. A radiation part extending in the horizontal direction is arranged between the first housing and the side shell;

[0017] A resonant sheet, which is installed in the resonant cavity, located between the first housing and the bottom case, and coupled to the first housing and the second housing respectively;

[0018] A small antenna board, which is installed on the side of the resonant sheet facing the bottom case. The small antenna board is provided with a feeding thimble, a matching circuit, an antenna port, a radio frequency connector, a first ground feeding thimble and a second ground feeding thimble. The radio frequency connector, the antenna port, the matching circuit and the feeding thimble are electrically connected. The first ground feeding thimble is connected to the bottom case, and the second ground feeding thimble is installed on the side of the small antenna board facing the resonant sheet and connected to the resonant sheet.

[0019] The technical solution of the present utility model uses the space between the metal structure of the mobile terminal and the resonant sheet as the radiation carrier of the antenna. Among them, the resonant sheet, the feeding thimble, the matching circuit, the antenna port, the radio frequency connector, the first ground feeding thimble and the second ground feeding thimble on the small antenna board jointly form a resonator. Utilizing the electromagnetic wave reflection mechanism and the principle of resonance, finally the resonant electromagnetic wave is reflected to the gap between the first housing and the side housing, and radiated outward through the radiation part, thereby obtaining electromagnetic wave signals with wide bandwidth, high gain and multi-frequency bands. It effectively solves the problems of narrow antenna bandwidth, small antenna gain and low antenna efficiency of the current all-metal body. Description of the Drawings

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the structures shown in these drawings.

[0021] Figure 1 An exploded view of an embodiment of the all-metal cavity multi-frequency antenna provided by the present utility model;

[0022] Figure 2 For Figure 1 The exploded view at the installation frame;

[0023] Figure 3 For Figure 1 The structural diagram of the resonant sheet;

[0024] Figure 4 For Figure 1 The front and back structural diagrams of the small antenna board.

[0025] Explanation of the reference numerals in the drawings:

[0026] 1000. All-metal cavity multi-band antenna; 1. Metal shell; 11. First shell; 12. Second shell; 121. Bottom shell; 1211. First laser-engraved part; 1212. Second laser-engraved part; 122. Side shell; 2. Radiation part; 3. Resonant chip; 31. Plane part; 32. First coupling part; 33. Second coupling part; 34. Second positioning hole; 4. Antenna small board; 41. Feeding thimble; 42. Matching circuit; 43. Antenna port; 44. RF connector; 45. First ground-feeding thimble; 46. Second ground-feeding thimble; 47. First positioning hole; 5. Mounting frame; 51. First positioning post; 52. Second positioning post.

[0027] The realization, functional features and advantages of the purpose of the present utility model will be further described with reference to the embodiments and the accompanying drawings. Specific embodiments

[0028] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

[0029] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present utility model, the directional indications are only used to explain the relative positional relationship and movement conditions between components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0030] In addition, if there are descriptions such as "first" and "second" involved in the embodiments of the present utility model, the descriptions of "first" and "second" are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, if "and / or" or "and / or" appears throughout the text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, or solution B, or a solution where A and B are satisfied simultaneously. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0031] With the rapid development of society, people's aesthetics are getting higher and higher. Various mobile electronic devices are iterating and emerging, showing a trend of extending and developing towards electronic devices with all-metal bodies. For antennas, an antenna is a transceiver conversion device for electromagnetic waves. The higher the frequency of the electromagnetic wave, the weaker its ability to penetrate metal and the stronger its ability to reflect signals. Therefore, in product design, metal has always been an insurmountable barrier for antennas. How to tune out the required resonant electromagnetic wave frequency band in a metal body or an all-metal body, and how to excite its electromagnetic wave signal to a greater extent have been difficult problems for antennas to overcome in recent years.

[0032] Currently, traditional antenna design schemes all require a large plastic clearance area. Otherwise, the bandwidth of the antenna will become extremely small, the efficiency will be extremely low, and it cannot meet the product design requirements of an all-metal body.

[0033] To solve the above problems, please refer to Figures 1 to 4 , the present utility model proposes a multi-band antenna 1000 with an all-metal cavity, including a metal shell 1, a resonant sheet 3, and an antenna small board 4. The metal shell 1 includes a first shell body 11 and a second shell body 12. The first shell body 11 is installed on the outer edge of the display screen of the mobile terminal, and the second shell body 12 is installed on the outer edge of the mobile terminal. The second shell body 12 includes a bottom shell 121 extending in the horizontal direction and a side shell 122 perpendicular to the bottom shell 121. The first shell body 11 is arranged parallel to the bottom shell 121 and encloses a resonant cavity with the second shell body 12. A radiation part 2 extending in the horizontal direction is arranged between the first shell body 11 and the side shell 122; the resonant sheet 3 is installed in the resonant cavity and is located between the first shell body 11 and the bottom shell 121, and is respectively coupled with the first shell body 11 and the second shell body 12; the antenna small board 4 is installed on the side of the resonant sheet 3 facing the bottom shell 121. The antenna small board 4 is provided with a feeding top pin 41, a matching circuit 42, an antenna port 43, a radio frequency connector 44, a first ground feeding top pin 45, and a second ground feeding top pin 46. The radio frequency connector 44, the antenna port 43, the matching circuit 42, and the feeding top pin 41 are electrically connected. The first ground feeding top pin 45 is connected to the bottom shell 121, and the second ground feeding top pin 46 is installed on the side of the antenna small board 4 facing the resonant sheet 3 and is connected to the resonant sheet 3.

[0034] The technical solution of the present utility model uses the space between the metal structure of the mobile terminal and the resonant sheet 3 as the radiation carrier of the antenna. Among them, the resonant sheet 3, the feeding top pin 41, the matching circuit 42, the antenna port 43, the radio frequency connector 44, the first ground feeding top pin 45, and the second ground feeding top pin 46 on the antenna small board 4 jointly form a resonator. By using the electromagnetic wave reflection mechanism and the principle of resonance, the resonant electromagnetic wave is finally reflected to the gap between the first shell body 11 and the side shell 122 and radiated outward through the radiation part 2, thereby obtaining an electromagnetic wave signal with a wide frequency band, high gain, and multiple frequency bands. It effectively solves the problems of narrow antenna bandwidth, small antenna gain, and low antenna efficiency of the current all-metal body.

[0035] In an alternative embodiment, for the convenience of installation and fixation of the all-metal cavity multi-band antenna 1000, the all-metal cavity multi-band antenna 1000 further includes a mounting frame 5. The mounting frame 5 is installed in the second housing 12 and connected to the second housing 12. The first housing 11 and the radiation part 2 are installed on the top of the mounting frame 5. Please refer to Figure 1 and Figure 2 , in this embodiment, the mounting frame 5 is made of plastic material to support and install various components in the mobile terminal. The bottom wall and the side wall of the mounting frame 5 are respectively connected to the bottom shell 121 and the side shell 122 of the second housing 12. The screen of the mobile terminal is installed horizontally on the top of the mounting frame 5, and the first housing 11 is installed horizontally on the periphery of the screen. There is a certain gap between the first housing 11 and the side shell 122 of the second housing 12. The radiation part 2 is installed horizontally in the gap and supported and fixed by the mounting frame 5, so as to ensure the stability of the all-metal cavity multi-band antenna 1000.

[0036] In an alternative embodiment, in order to realize the feeding and grounding connection of the resonance chip 3, the antenna small board 4 is further provided with a second feeding and grounding thimble 46. The second feeding and grounding thimble 46 is installed on the side of the antenna small board 4 facing the resonance chip 3, and the second feeding and grounding thimble 46 is connected to the resonance chip 3. Please refer to Figures 1 to 4 , the second feeding and grounding thimble 46 is installed on the side of the antenna small board 4 facing the resonance chip 3, so that the resonance chip 3 can be connected to the bottom shell 121 to realize grounding to form a grounding loop, which is convenient for effectively generating fundamental frequency electromagnetic waves and enabling more energy to be effectively radiated, thereby improving the radiation efficiency of the all-metal cavity multi-band antenna 1000.

[0037] In an alternative embodiment, in order to improve the radiation efficiency of the resonance chip 3, the resonance chip 3 includes a planar part 31, a first coupling part 32 and a second coupling part 33. The planar part 31 has a first side end and a second side end adjacent to the first side end. The first side end extends and bends towards the direction close to the second housing 12 to form the first coupling part 32, and the second side end extends and bends towards the direction close to the second housing 12 to form the second coupling part 33. The first coupling part 32 and the second coupling part 33 are coupled with the second housing 12. Please refer to Figures 1 to 3 , the planar part 31 is arranged parallel to the bottom shell 121 of the second housing 12. The first coupling part 32 and the second coupling part 33 are respectively formed by extending and bending from the side of the planar part 31 away from the side shell 122 of the second housing 12 towards the direction close to the bottom shell 121, and the first coupling part 32 and the second coupling part 33 are coupled with the bottom shell 121 to realize the energy transfer between the second housing 12 and the resonance chip 3, and it is also convenient to broaden the operating frequency of the all-metal cavity multi-band antenna 1000 and improve the efficiency of the antenna.

[0038] Further, to facilitate the coupling between the bottom case 121 and the resonator chip 3, a first laser-engraved portion 1211 and a second laser-engraved portion 1212 are formed on one side of the second housing 12 facing the resonator chip 3. The first laser-engraved portion 1211 is coupled to the first coupling portion 32, and the second laser-engraved portion 1212 is coupled to the second coupling portion 33. It should be noted that the laser engraving here refers to manufacturing a fine circuit pattern on the surface of an object through laser engraving technology to realize the function of the antenna. Compared with the traditional antenna manufacturing process, the laser engraving technology has technical advantages such as small finished product volume, simplified manufacturing process, short R & D and manufacturing time, stable manufacturing process, environmental protection, and high accuracy. By laser-engraving the first laser-engraved portion 1211 and the second laser-engraved portion 1212 on the bottom case 121 to be respectively coupled and connected to the first coupling portion 32 and the second coupling portion 33 on the resonator chip 3, a resonant cavity is formed by enclosing the resonator chip 3 and the bottom case 121, realizing high gain of the antenna and improving the working efficiency of the antenna.

[0039] In an optional embodiment, to fix the resonator chip 3, a plurality of first fixing holes are provided in the planar portion 31, and a plurality of second fixing holes are provided in the mounting frame 5. A first fixing hole corresponds to a second fixing hole, and the resonator chip 3 and the mounting frame 5 are fixedly connected by sequentially passing a fixing screw through the first fixing hole and the second fixing hole. Please refer to Figures 1 to 3 , in this embodiment, first fixing holes are provided around the resonator chip 3, and the resonator chip 3 is fixedly installed on the mounting frame 5 by passing fixing members such as screws through and fixing, so as to ensure the stability of the resonator chip 3. In addition, a first fixing hole is also provided at the middle position of the resonator chip 3 corresponding to the antenna small board 4. This first fixing hole can not only fix the resonator chip 3 to the mounting frame 5, but also fix the antenna small board 4 to the mounting frame 5. By sequentially passing screws through the resonator chip 3 and the antenna small board 4 and screwing them to the bottom mounting frame 5, the resonator chip 3 and the mounting frame 5 can clamp and fix the middle antenna small board 4, ensuring the stability of the installation of the antenna small board 4. In addition, a profiling groove similar to the shape of the antenna small board 4 is formed on the mounting frame 5, so as to accurately determine the installation position of the antenna small board 4 when installing the antenna small board 4, improving the convenience of installation. In this embodiment, the antenna small board 4 is a printed circuit board, which can integrate multiple circuit structures, and has a small volume and low cost, so as to facilitate the installation of the full-metal cavity multi-frequency antenna 1000 in the smallest possible space.

[0040] Further, to realize the installation and positioning of the antenna small board 4 and the resonator chip 3, the mounting frame 5 is provided with a first positioning post 51, and the antenna small board 4 is provided with a first positioning hole 47. A first positioning post 51 is inserted into a first positioning hole 47. The mounting frame 5 is further provided with a second positioning post 52, and the resonator chip 3 is formed with a second positioning hole 34. A second positioning post 52 is inserted into a second positioning hole 34. Please refer to Figures 1 to 4, a first positioning post 51 and a second positioning post 52 are respectively arranged on the installation frame 5. The first positioning post 51 is used for positioning when installing the antenna small board 4, and the second positioning post 52 is used for positioning when installing the resonant piece 3, so as to ensure that each component can be installed in the accurate position when assembling the all-metal cavity multi-band antenna 1000, avoiding errors. In addition, the first positioning post 51 and the second positioning post 52 can also play a limiting role, preventing the antenna small board 4 and the resonant piece 3 from generating lateral displacement in the horizontal direction after installation, and ensuring the stability of the all-metal cavity multi-band antenna 1000. In this embodiment, both the first positioning post 51 and the second positioning post 52 are provided with two, and are arranged diagonally, which has an anti-fooling effect and can avoid reverse installation when installing the antenna small board 4 and the resonant piece 3. Of course, in other embodiments, the number of the first positioning post 51 and the second positioning post 52 can also be three, four or more, and the installation orientation can also be arranged according to the actual structure of the installation frame 5, and can be specifically selected according to actual needs, and no specific limitation is made here.

[0041] In an optional embodiment, in order to facilitate the energy transfer of the resonant piece 3 between the all-metal cavity multi-band antennas 1000, the material of the resonant piece 3 is one of copper, aluminum and stainless steel. In this solution, it is recommended to make the resonant piece 3 of a metal material. On the one hand, by using a metal material with good conductivity, electromagnetic waves can be effectively received and transmitted, reducing energy loss, and the metal is more sensitive to electromagnetic waves and can better interact with electromagnetic waves. On the other hand, the metal has high strength and durability, can withstand various environmental conditions, and can extend the service life of the all-metal cavity multi-band antenna 1000. The above are only several preferred materials of the resonant piece 3, and the specific material can be selected according to actual needs.

[0042] The working principle of the all-metal cavity multi-band antenna 1000 in this solution is described in detail below:

[0043] This all-metal cavity multi-band antenna 1000 includes a metal cavity and resonators. The metal cavity consists of an inner cavity (the cavity between the resonator sheet 3 and the bottom shell 121), an outer cavity (the cavity between the first housing 11 and the resonator sheet 3), and cavity gaps. The inner cavity is formed by the cavity between the resonator sheet 3 and the bottom shell 121, and the first coupling portion 32 and the second coupling portion 33 at the bottom of the resonator sheet 3 are directly in contact with and connected to the first laser-engraved portion 1211 and the second laser-engraved portion 1212 on the bottom shell 121 respectively, thereby forming an inner cavity of the bottom shell 121 - the first laser-engraved portion 1211 - the first coupling portion 32 - the first planar portion 31 - the second coupling portion 33 - the second laser-engraved portion 1212 - the bottom shell 121. The outer cavity is formed by the cavity between the first housing 11 and the planar portion 31 of the resonator sheet 3. The radiation portion 2 is located at the gap opening between the inner / outer cavity and the side shell 122 and is arranged along the inner edge of the side shell 122 for radiating and receiving antenna signals.

[0044] Its resonator is composed of a resonator chip 3, an antenna feeding unit (RF connector 44 - antenna port 43 - matching circuit 42 - feeding thimble 41), an antenna grounding unit (second grounding thimble 46 - first grounding thimble 45 - bottom case 121), antenna port 43, and RF connector 44. The resonator chip 3 is in direct contact with the feeding thimble 41, the second grounding thimble 46, and the bottom case 121, and is in indirect contact with the first grounding thimble 45. The antenna feeding unit is composed of the feeding thimble 41, the matching circuit 42, the antenna port 43, and the RF connector 44, and there are wire connections between the components; the feeding thimble 41 is in direct contact with the resonator chip 3; the matching circuit 42 is used to tune the fundamental frequency electromagnetic wave of the resonator; the antenna port 43 is used to connect the RF connector 44; the RF connector 44 is used to transmit the receiving / transmitting frequency signal of the antenna in the cavity. The antenna grounding unit is composed of the first grounding thimble 45 and the second grounding thimble 46. The second grounding thimble 46 is in direct contact with the resonator chip 3, and the first grounding thimble 45 is in direct contact with the bottom case 121; the antenna feeding unit and the antenna grounding unit form two different antenna loops that can excite the fundamental frequency electromagnetic wave, that is, the first antenna loop: RF connector 44 - antenna port 43 - matching circuit 42 - feeding thimble 41 - resonator chip 3 - second grounding thimble 46; the second antenna loop: RF connector 44 - antenna port 43 - matching circuit 42 - feeding thimble 41 - resonator chip 3 - second grounding thimble 46 - first grounding thimble 45 - bottom case 121. The first antenna loop and the second antenna loop can generate fundamental frequency electromagnetic waves of different frequency bands. The fundamental frequency electromagnetic wave continuously reflects back and forth in the inner cavity and the outer cavity to form a standing wave of a specific frequency, and finally reaches the resonant state. At this time, the amplitude of the electromagnetic oscillation inside the cavity reaches the peak value. The directivity and radiation efficiency of the all-metal cavity multi-band antenna 1000 in this cavity are the best, and the electromagnetic wave emitted or received by the antenna will be radiated out or received in through the radiation part 2 in the cavity gap; thus, a wide-bandwidth, high-gain, multi-band electromagnetic wave signal is obtained. It effectively solves the problems of narrow antenna bandwidth, small antenna gain, and low antenna efficiency of the current all-metal body, and improves the efficiency of the antenna in a limited space.

[0045] The present utility model also proposes a mobile terminal, which includes an all-metal cavity multi-band antenna 1000. The specific structure of the all-metal cavity multi-band antenna 1000 refers to the above-mentioned embodiments. Since this mobile terminal adopts all the technical solutions of the above-mentioned all embodiments, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, and will not be elaborated here one by one.

[0046] The above are only exemplary embodiments of the present utility model, and do not limit the patent scope of the present utility model accordingly. Any equivalent structural transformation made under the technical concept of the present utility model by using the content of the specification and drawings of the present utility model, or any direct / indirect application in other related technical fields is included in the patent protection scope of the present utility model.

Claims

1. A full metal cavity multi-frequency antenna, characterized in that: include: A metal shell, the metal shell comprising a first shell and a second shell, the first shell being mounted on an outer edge of a display screen of the mobile terminal, the second shell being mounted on an outer edge of the mobile terminal, the second shell comprising a bottom shell extending in a horizontal direction and a side shell perpendicular to the bottom shell, the first shell being arranged in parallel with the bottom shell and enclosing the second shell to form a resonant cavity, and a radiation portion extending in a horizontal direction being arranged between the first shell and the side shell; A resonant plate, the resonant plate is installed in the resonant cavity, is located between the first shell and the bottom shell, and is coupled to the first shell and the second shell respectively; An antenna board, wherein the antenna board is installed on the side of the resonant plate facing the bottom shell, the antenna board is provided with a feed pin, a matching circuit, an antenna port, an RF connector, a first ground feed pin and a second ground feed pin, the RF connector, the antenna port, the matching circuit and the feed pin are electrically connected, the first ground feed pin is connected to the bottom shell, and the second ground feed pin is installed on the side of the antenna board facing the resonant plate and connected to the resonant plate.

2. The all-metal cavity multi-frequency antenna according to claim 1, characterized in that: The all-metal cavity multi-frequency antenna also includes a mounting frame, which is mounted in the second shell and connected to the second shell, and the first shell and the radiation part are mounted on the top of the mounting frame.

3. The all-metal cavity multi-frequency antenna according to claim 2, characterized in that: The resonant plate includes a planar portion, a first coupling portion, and a second coupling portion. The planar portion has a first side end and a second side end adjacent to the first side end. The first side end extends and bends toward the direction close to the second shell to form a first coupling portion. The second side end extends and bends toward the direction close to the second shell to form a second coupling portion. The first coupling portion and the second coupling portion are coupled to the second shell.

4. The all-metal cavity multi-frequency antenna according to claim 3, characterized in that: A first laser engraved portion and a second laser engraved portion are formed on a side of the second shell facing the resonant plate. The first laser engraved portion is coupled to the first coupling portion, and the second laser engraved portion is coupled to the second coupling portion.

5. The all-metal cavity multi-frequency antenna according to any one of claims 3 to 4, characterized in that: The planar portion is provided with a plurality of first fixing holes, and the mounting frame is provided with a plurality of second fixing holes, one first fixing hole corresponds to one second fixing hole, and the first fixing holes and the second fixing holes are sequentially penetrated by fixing screws to realize fixed connection between the resonant plate and the mounting frame.

6. The all-metal cavity multi-frequency antenna according to claim 5, characterized in that: The installation frame is provided with a first positioning column, the antenna plate is provided with a first positioning hole, and a first positioning column is inserted and installed in a first positioning hole.

7. The all-metal cavity multi-frequency antenna according to claim 6, characterized in that: The installation frame is further provided with a second positioning column, the resonance plate is formed with a second positioning hole, and a second positioning column is inserted and installed in a second positioning hole.

8. The all-metal cavity multi-frequency antenna according to claim 1, characterized in that: The resonant plate is made of one of copper, aluminum and stainless steel.

9. A mobile terminal, characterized in that: It comprises the full metal cavity multi-frequency antenna as described in any one of claims 1 to 8.

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