Resonant cavity antenna for mobile equipment and mobile equipment

Abstract

The utility model provides a resonant cavity antenna for mobile equipment and the mobile equipment. The resonant cavity antenna for the mobile equipment comprises a metal shell, a feed end and a grounding part, the metal shell is used for forming a resonant cavity with a mainboard of the mobile equipment and is electrically connected with the ground end of the mainboard of the mobile equipment; the feed end is connected with the metal shell; the grounding part is used for being connected with a screen protection metal plate of the mobile device, the grounding part is arranged on the face, away from the metal bottom plate, of the metal shell, and the distance between the grounding part and the edge, close to the feed end, of the metal shell is 1 / 4-1 / 2 of the resonant wavelength. The resonant cavity antenna for the mobile equipment is clear in resonant area, is suitable for the mobile equipment with an all-metal machine body, is small in occupied space, can realize certain antenna clearance, and is favorable for improving the efficiency of the antenna.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of antenna, specifically relates to a resonant cavity antenna for mobile equipment and mobile equipment. BACKGROUND

[0002] The Combo antenna of smart phone and tablet computer, also called WiFi & BT antenna, although small in size and less important than the main antenna, its performance can directly affect the use experience of customers. In tablet computer, WiFi is the main network connection mode, and its performance can be directly reflected in the use process of users. In addition, the WiFi antenna usually needs to support 5G WiFi, and the increase of frequency band brings challenges to the antenna design, so that the performance is difficult to balance. The efficiency of Combo antenna directly affects the actual use effect of customers.

[0003] The Combo antenna in the current mobile phone is usually installed in the whole machine shell, and the whole machine shell is usually made of plastic material or metal frame design. With the continuous reduction of the overall thickness of the mobile phone, the design space of the Combo antenna is squeezed. The existing antenna design is mostly located on the inner side of the antenna support or middle frame / back shell in the mobile phone, adopts FPC (flexible printed circuit) or LDS / PDS (laser direct structuring / plastic laser direct structuring) engraving technology for wiring as part of the antenna, or directly uses the metal frame as the antenna. At present, the commonly used wiring form of Combo antenna is double spring IFA / loop. However, the current environment is more complex, the bandwidth of the existing antenna form is narrow, and it is difficult to meet the needs of 2.4G and 5G WiFi at the same time, resulting in poor WiFi performance.

[0004] In addition, the popular mobile phones and tablet computers at present generally adopt full screen and full metal body design, which reduces the clear area of the antenna and increases the difficulty of antenna design. The existing antenna scheme is no longer suitable for these new design requirements. This brings new challenges to the antenna design. INVENTION CONTENTS

[0005] The utility model aims at overcoming the shortcomings and deficiencies in the prior art, and provides a resonant cavity antenna for mobile equipment, which has clear resonant area, is suitable for mobile equipment with full metal body, occupies small space, can realize certain antenna clearance, and is beneficial to improve the antenna efficiency.

[0006] The utility model provides a resonant cavity antenna for mobile device, including metal shell, feed end and ground part, the metal shell is used for forming the resonant cavity with the mainboard of mobile device and is electrically connected with the mainboard ground end of mobile device, the feed end is connected with the metal shell, the ground part is used for connecting with the screen protection metal plate of mobile device, the ground part sets up in the one side of the metal shell away from the metal bottom plate, the distance between the ground part and the edge of the metal shell close to the feed end is 1 / 4-1 / 2 of resonant wavelength.

[0007] The utility model provides a resonant cavity antenna for mobile device, including metal shell, feed end and ground part, the metal shell is used for forming the resonant cavity with the mainboard of mobile device and is electrically connected with the mainboard ground end of mobile device, the feed end is connected with the metal shell, the ground part is used for connecting with the screen protection metal plate of mobile device, the ground part sets up in the one side of the metal shell away from the metal bottom plate, the distance between the ground part and the edge of the metal shell close to the feed end is 1 / 4-1 / 2 of resonant wavelength.

[0008] Further, the metal shell includes a radiation metal surface and a side end surface protruding from an edge of the radiation metal surface, the radiation metal surface is configured to form a resonant cavity with the mainboard of the mobile device, and the side end surface is configured to be electrically connected with a ground end of the mainboard of the mobile device; the ground part is located outside the resonant cavity and is arranged on one side of the radiation metal surface, and the side end surface is protrudingly arranged from a side of the radiation metal surface away from the ground part; and the feed end is arranged at an edge of the radiation metal surface.

[0009] Further, the ground part is a ground foam. The ground foam has good flexibility, can adapt to electronic components and circuit boards of different shapes, and can realize close contact with the screen protection metal plate of the mobile device to maintain effective connection.

[0010] Further, the ground foam is in a strip shape, and the ground foam is arranged parallel to a length direction or a width direction of the radiation metal surface. The ground foam in the strip shape can form an antenna clearance with regular shape, and the antenna resonant region is clear, which is beneficial to conveniently adjust the resonant frequency.

[0011] Further, the feed end protrudes from an edge of the radiation metal surface and is arranged away from the ground part, and a protruding height of the feed end is the same as a height of the side end surface. In addition to the function of exciting the resonant cavity, the feed end can also support the radiation metal surface.

[0012] Further, at least one supporting part is arranged on the side of the radiating metal surface away from the grounding part, and the height of the supporting part is the same as the height of the feeding end.

[0013] Further, the working frequency band of the resonant cavity is 2.4G WiFi frequency band or 5G WiFi frequency band, and the distance between the grounding part and the edge of the metal shell close to the feeding end is 1 / 4-1 / 2 of the resonant wavelength of the 5G WiFi frequency band.

[0014] Further, the height of the resonant cavity is greater than or equal to 1mm.

[0015] The utility model also provides a mobile device, including screen protection metal plate, mainboard, metal bottom plate and above mobile device resonant cavity antenna, screen protection metal plate with metal bottom plate interconnect and enclose and form the containing space, mainboard is located in the containing space in and sets up on metal bottom plate, the metal shell of mobile device resonant cavity antenna is located in the containing space in and sets up on metal bottom plate, the metal shell with mainboard forms resonant cavity, the feeding end with mainboard electricity is connected, the grounding part is connected with the screen protection metal plate of mobile device.

[0016] In the mobile device provided by the utility model, the screen protection metal plate and the metal bottom plate enclose to form a containing space, the mainboard and the metal shell form a resonant cavity, the grounding part is located on the metal shell and is arranged away from the resonant cavity to be short-circuited with the screen protection metal plate to form an antenna loop.

[0017] In order to better understand and implement, the utility model is described in detail below with reference to the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 Fig. 1 is a structural schematic view of a resonant cavity antenna for a mobile device according to an embodiment of the utility model.

[0019] Figure 2 Fig. 2 is a schematic view of a resonant cavity of the resonant cavity antenna for a mobile device according to the embodiment 1.

[0020] Figure 3 is a connection diagram of the resonant cavity antenna for mobile device of embodiment 1 and mainboard.

[0021] Figure 4 is an S11 parameter diagram of the resonant cavity antenna for mobile device of embodiment 1.

[0022] Figure 5 is an antenna efficiency diagram of the resonant cavity antenna for mobile device of embodiment 1.

[0023] Figure 6 is an internal connection diagram of the mobile device of embodiment 2. DETAILED DESCRIPTION

[0024] The utility model embodiments are further described in detail below in combination with the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the utility model embodiments, and not limited to the utility model embodiments. In addition, it should be noted that, in order to facilitate the description, only the parts related to the utility model embodiments are shown in the drawings, not all structures.

[0025] In addition, the terms first, second, third and the like in the description and claims are only used for the purpose of distinguishing the description of the same technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. It also does not necessarily describe the order or time sequence. The terms are interchangeable under appropriate circumstances. Therefore, the features defined as "first", "second" can explicitly or implicitly include at least one of the features.

[0026] Similarly, the terms "fixed", "connected" are also used in the description and claims, and should not be understood as limited to direct connection. Therefore, the expression "device A is connected with device B" should not be limited to device A directly connected to device B in the device or system, which means that there is a path between device A and device B, which can be a path including other devices or tools.

[0027] Example 1

[0028] The embodiment provides a resonant cavity antenna for mobile device, Figure 1 is a structure diagram of the resonant cavity antenna for mobile device, Figure 2 is a schematic diagram of the resonant cavity of the resonant cavity antenna for mobile device, Figure 3 is a connection diagram of the resonant cavity antenna for mobile device and mainboard, please refer to Figures 1-3The resonant cavity antenna for mobile device comprises a metal shell 1, a feeding end 2 and a grounding part 3; the metal shell 1 is used to form a resonant cavity with a main board 6 of the mobile device and is electrically connected with a ground end of the main board 6; the feeding end 2 is connected with the metal shell 1; the grounding part 3 is used to be connected with a screen protection metal plate 5 of the mobile device, the grounding part 3 is arranged on a side of the metal shell 1 away from a metal bottom plate 7, and a distance between the grounding part 3 and an edge of the metal shell 1 close to the feeding end 2 is 1 / 4-1 / 2 of a resonant wavelength.

[0029] In the resonant cavity antenna for mobile device, the metal shell 1 is used to form a resonant cavity with the main board 6, the grounding part 3 is arranged on a side of the metal shell 1 away from the metal bottom plate 7, the grounding part 3 is short-circuited with the screen protection metal plate 5 of the mobile device, the distance between the grounding part 3 and the edge of the metal shell 1 close to the feeding end 2 is used to adjust the resonant wavelength, and the antenna frequency band and bandwidth are controlled; a vertical projection of the metal shell 1 on the main board 6 forms an antenna clearance, and the resonant cavity is excited through the feeding end 2. The resonant cavity antenna for mobile device has a clear resonant region, is suitable for the mobile device with a full-metal body, occupies a small space, can realize a certain antenna clearance, and is beneficial to improving the antenna efficiency.

[0030] Please refer to Figures 1-3 In the embodiment, the metal shell 1 comprises a radiation metal surface 11 and a side end surface 12 protruding from an edge of the radiation metal surface 11, the radiation metal surface 11 is used to form a resonant cavity with the main board 6 of the mobile device, and the side end surface 12 is used to be electrically connected with a ground end of the main board 6; the grounding part 3 is located outside the resonant cavity and arranged on a side of the radiation metal surface 11, the side end surface 12 is protrudingly arranged on a side of the radiation metal surface 11 away from the grounding part 3; and the feeding end 2 is arranged on an edge of the radiation metal surface 11.

[0031] The side end surface 12 is separately grounded with the grounding part 3 to realize impedance matching and reduce interference. The side end surface 12 is in a strip shape, is stably connected with the ground end of the main board 6 of the mobile device, and can also support the radiation metal surface 11 to form a resonant cavity with a certain height.

[0032] In an embodiment, the metal shell 1 is one of a copper shell, a steel shell and an aluminum shell.

[0033] Please refer to Figures 1-3 In the embodiment, the grounding part 3 is a grounding foam 31. The grounding foam 31 has good flexibility, can adapt to electronic components and circuit boards with different shapes, can realize close contact with the screen protection metal plate 5 of the mobile device, and can maintain effective connection. The feeding end 2, the grounding part 3, the radiation metal surface 11 located between the feeding end 2 and the grounding part 3, and the metal bottom plate 7 of the mobile device form a resonant cavity for antenna radiation, and the position of the grounding part 2 can be changed to change the width of the radiation metal surface 11 between the feeding end 2 and the grounding part 3, so as to adjust the radiation wavelength.

[0034] Referring to Figures 1-3 In the embodiment, the ground foam 31 is in a strip shape, and the ground foam 31 is arranged parallel to the length direction or the width direction of the radiating metal surface 11. The strip-shaped ground foam is conducive to full grounding, and the influence of spurious signals is smaller. Meanwhile, the strip-shaped ground foam 31 can form an antenna clearance with a regular shape, and the antenna resonance region is clear, which is conducive to the convenient adjustment of the resonance frequency.

[0035] Referring to Figures 1-3 In the embodiment, the feeding end 2 is arranged protruding from the edge of the radiating metal surface 11 and away from the ground part 3, and the protruding height of the feeding end 2 is the same as the height of the side end surface 12. In addition to the function of exciting the resonance cavity, the feeding end 2 can also play a certain supporting role on the radiating metal surface 11.

[0036] Referring to Figure 1 In an embodiment, the feeding end 2 includes a supporting part 21 and a connecting part 22. One end of the supporting part 21 is arranged perpendicularly at the edge of the radiating metal surface 11, and the other end is connected with the connecting part 22. The connecting part 22 is bent and arranged perpendicularly to the supporting part 21, and the connecting part 22 is connected with the ground end of the main board 6 of the mobile device.

[0037] Referring to Figures 1-3 In the embodiment, at least one supporting part 4 is arranged protruding from the side of the radiating metal surface 11 away from the ground part 3, and the protruding height of the supporting part 4 is the same as the protruding height of the feeding end 2. The supporting part 4 plays a certain supporting role on the radiating metal surface 11 to ensure the height of the resonance cavity and avoid the collapse of the radiating metal surface 11 under external force impact. The supporting part 4 can be an insulating block, or the supporting part 4 is a feeding point at the edge of the radiating metal surface 11 to form a loop circuit.

[0038] In the embodiment, the working frequency band of the resonance cavity is the 2.4G WiFi frequency band or the 5G WiFi frequency band, and the distance between the ground part 3 and the edge of the metal shell 1 close to the feeding end 2 is 1 / 4-1 / 2 of the resonance wavelength of the 5G WiFi frequency band. The distance between the ground part 3 and the edge of the metal shell 1 close to the feeding end 2 is used to control the radiating frequency band. In order to ensure the antenna efficiency, the distance is 1 / 4-1 / 2 of the resonance wavelength of the 5G WiFi frequency band.

[0039] In an embodiment, the distance between the ground part 3 and the edge of the metal shell 1 close to the feeding end 2 is 1 / 4 of the resonance wavelength of the 5G WiFi frequency band.

[0040] In the embodiment, the height of the resonance cavity is ≥1mm. The height of the resonance cavity is limited to ensure that the antenna resonates at the designed working frequency, and to maintain high gain and bandwidth while reducing the size of the antenna.

[0041] In an embodiment, the mobile device uses a resonant cavity antenna with a length of 50 mm, a width of 28 mm, and a height of 1 mm of the resonant cavity, i.e., the metal shell 1 is arranged on the main board 6, the distance between the metal shell 1 and the main board 6 is 1 mm, and the radiation metal surface 11 is supported by the feeding end 2, the side end surface 12, and the support part 4 to maintain the height of the resonant cavity. By adjusting the position of the grounding foam 31, the distance between the grounding foam 31 and the edge of the radiation metal surface 11 is adjusted, the antenna loop is formed with the feeding end 2, and thus the volume of the resonant cavity is controlled to control the antenna frequency band and bandwidth. In an embodiment, the distance between the grounding foam 31 and the edge of the radiation metal surface 11 is 3 mm.

[0042] Figure 4 is an S11 parameter diagram of the resonant cavity antenna for a mobile device, please refer to Figure 4 , the return loss at the 2.4G WiFi frequency band and the return loss at the 5G WiFi frequency band are less than -5 dB, and the impedance matching is good.

[0043] Figure 5 is an antenna efficiency diagram of the resonant cavity antenna for a mobile device, please refer to Figure 5 , the antenna efficiency at the 2.4G WiFi frequency band is -3.8 dB, and the antenna efficiency at the 5G WiFi frequency band is (-7.2)~(-2.2) dB.

[0044] Example 2

[0045] The embodiment also provides a mobile device, Figure 6 is a schematic diagram of internal connections of the mobile device, please refer to Figure 4 , the mobile device comprises a screen protection metal plate 5, a main board 6, a metal bottom plate 7, and the resonant cavity antenna for a mobile device described above; the screen protection metal plate 5 and the metal bottom plate 7 are connected to each other and enclose a containing space; the main board 6 is located in the containing space and arranged on the metal bottom plate 7; the metal shell 1 of the resonant cavity antenna for a mobile device is located in the containing space and arranged on the metal bottom plate 7, and the resonant cavity is formed between the metal shell 1 and the main board 6; the feeding end 2 is electrically connected to the main board 6; and the grounding part 3 is connected to the screen protection metal plate 5 of the mobile device.

[0046] In the mobile device provided by the embodiment, the screen protection metal plate 5 and the metal bottom plate 7 enclose a containing space, the resonant cavity is formed by the main board 6 and the metal shell 1, the grounding part 3 is located on the metal shell 1 and arranged away from the resonant cavity to be short-circuited with the screen protection metal plate 5 to form an antenna loop. The resonant region of the mobile device provided by the utility model is clear, the resonant frequency and bandwidth can be adjusted by adjusting the position of the grounding part 3, the optimization is convenient and fast, the mobile device is suitable for a full-metal body, the vertical projection of the metal shell 1 on the main board 6 forms an antenna clearance, and the antenna performance is improved.

[0047] Referring to Figure 4 , the screen protection metal plate 5 and the metal bottom plate 7 are in a disassembled state, in an embodiment, the screen protection metal plate 5 is used to be attached to the glass screen to play a protection role, and the screen protection metal plate 5 and the metal bottom plate 7 are buckled and fixed to form a containing space. The feeding end 2 is connected with the radio frequency link on the mainboard 6 to realize the communication of the 2.4G WiFi frequency band and the 5G WiFi frequency band. The mobile device can be a mobile device with a full-metal body such as a tablet, a mobile phone, a notebook computer, and a television. The metal bottom plate 7 can be used as a back cover plate of the mobile device. The resonant cavity antenna of the mobile device occupies a very small device space, can realize two communication frequency bands, is conducive to reducing the number of antennas, reducing the cost, and realizing a wider bandwidth and a better antenna efficiency. The size of the mobile device such as a mobile phone can be reduced to 200mm*150mm*8mm, and is suitable for the design of a full screen and a full metal.

[0048] The utility model is not limited to the above-mentioned embodiment, if various changes or deformation of the utility model do not deviate from the spirit and scope of the utility model, if these changes and deformation belong to the right claim and equivalent technical scope of the utility model, then the utility model also intends to include these changes and deformation.

Claims

1.A resonant cavity antenna for mobile device, comprising: a metal shell, a feeding end and a grounding part, wherein the metal shell is configured to form a resonant cavity with a main board of the mobile device and is electrically connected to a ground terminal of the main board; the feeding end is connected to the metal shell; and the grounding part is configured to be connected to a screen protection metal plate of the mobile device and is arranged on one side of the metal shell, and a distance between the grounding part and an edge of the metal shell close to the feeding end is 1 / 4-1 / 2 of a resonant wavelength. 2.The resonant cavity antenna for mobile device according to claim 1, wherein: the metal shell comprises a radiation metal surface configured to form the resonant cavity with the main board of the mobile device and a side end surface protruding from an edge of the radiation metal surface, and the side end surface is configured to be electrically connected to the ground terminal of the main board; the grounding part is arranged on one side of the radiation metal surface outside the resonant cavity, the side end surface is arranged on one side of the radiation metal surface away from the grounding part, and the feeding end is arranged on an edge of the radiation metal surface. 3.The resonant cavity antenna for mobile device according to claim 2, wherein: the grounding part is a grounding foam. 4.The resonant cavity antenna for mobile device according to claim 3, wherein: the grounding foam is in a strip shape, and the grounding foam is arranged in parallel to a length direction or a width direction of the radiation metal surface. 5.The resonant cavity antenna for mobile device according to claim 2, wherein: the feeding end protrudes from the edge of the radiation metal surface and is arranged away from the grounding part, and a protruding height of the feeding end is the same as a height of the side end surface. 6.The resonant cavity antenna for mobile device according to claim 5, wherein: one side of the radiation metal surface away from the grounding part is provided with at least one supporting part, and the protruding height of the supporting part is the same as the protruding height of the feeding end. 7.The resonant cavity antenna for mobile device according to claim 1, wherein: a working frequency band of the resonant cavity is a 2.4G WiFi frequency band or a 5G WiFi frequency band, and the distance between the grounding part and the edge of the metal shell close to the feeding end is 1 / 4-1 / 2 of a resonant wavelength of the 5G WiFi frequency band. 8.The resonant cavity antenna for mobile device according to any one of claims 1-7, wherein: a height of the resonant cavity is greater than or equal to 1mm. 9.A mobile device, comprising: a screen protection metal plate, a main board, a metal bottom plate and the resonant cavity antenna for mobile device according to any one of claims 1-8; the screen protection metal plate and the metal bottom plate are connected to each other and form an accommodation space; the main board is arranged on the metal bottom plate in the accommodation space; the metal shell of the resonant cavity antenna for mobile device is arranged on the main board in the accommodation space, and a resonant cavity is formed between the metal shell and the metal bottom plate; the feeding end is electrically connected to the main board; and the grounding part is connected to the screen protection metal plate of the mobile device. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Images