Wifi antenna and mobile terminal device

Abstract

The invention discloses a wifi antenna and a mobile terminal device, and relates to the technical field of communication, the wifi antenna comprises a microstrip antenna structure and a radiation cavity, a dielectric layer of the microstrip antenna structure is located in the radiation cavity, and the wall surface of the radiation cavity is vertically connected or contacted with a grounding layer of the microstrip antenna structure. The size of the antenna can be reduced on the basis of ensuring the performance of the antenna.

Description

Technical Field

[0001] This application relates to the field of communication technologies, and particularly to a Wi-Fi antenna and a mobile terminal device. Background Art

[0002] Communication antennas are key devices for transmitting and receiving radio waves, and they play a crucial role in wireless communication systems. The design and type of antennas vary according to factors such as their application scenarios, operating frequencies, required gains, and physical sizes. Wi-Fi antennas are a type of wireless communication antenna, mainly used to enhance and optimize the transmission of Wi-Fi signals.

[0003] Wi-Fi technology has been widely applied to various wireless communication devices and has become an indispensable part of the field of electromagnetic information transmission. With the development of technology, the design of Wi-Fi antennas is also constantly evolving to meet the growing demand for high-speed data transmission and the trend of miniaturization.

[0004] In some fields of electromagnetic information transmission, the volume of the carriers applying Wi-Fi technology is strictly limited, requiring Wi-Fi antennas to meet strict volume requirements while ensuring certain performance. Summary of the Invention

[0005] The purpose of this application is to provide a Wi-Fi antenna and a mobile terminal device, and the Wi-Fi antenna can reduce the volume of the antenna while ensuring the performance of the antenna.

[0006] To achieve the above purpose, this application provides the following solutions:

[0007] In a first aspect, this application provides a Wi-Fi antenna, including: a microstrip antenna structure and a radiation cavity. The dielectric layer of the microstrip antenna structure is located in the radiation cavity, and the wall surface of the radiation cavity is vertically connected or in contact with the ground layer of the microstrip antenna structure.

[0008] Optionally, the radiation cavity is composed of a metal wall, and the wall surface of the metal wall is vertically connected or in contact with the ground layer.

[0009] Optionally, the microstrip antenna structure includes a PCB board and a feeding unit; where

[0010] The PCB board includes a radiation layer, a dielectric layer, and a ground layer stacked in sequence. A feeding point is provided on the radiation layer, feeding holes are opened on the dielectric layer and the ground layer, the feeding unit is arranged in the feeding holes, and one end of the feeding unit away from the ground layer is connected to the feeding point.

[0011] Optionally, the radiation layer, the dielectric layer, and the ground layer are all rectangular. The center points of the radiation layer, the dielectric layer, and the ground layer are located on the same central axis, and the feeding point is located on the central axis.

[0012] Optionally, the length of the radiation layer is 20.10 mm, the width is 16.0 mm, and the thickness is 0.01 mm;

[0013] The length of the dielectric layer is 32 mm, the width is 29 mm, and the thickness is 5 mm;

[0014] The length of the ground layer is 32 mm, the width is 29 mm, and the thickness is 0.01 m;

[0015] The distance between the feeding point and the center point is 2.45 mm;

[0016] The metal wall includes a first metal sheet and a second metal sheet. The length of the first metal sheet is 29 mm, the width is 3.062 mm, and the thickness is 0.01 mm. The first metal sheet is fixed on the side of the width of the dielectric layer. The length of the second metal sheet is 32 mm, the width is 3.062 mm, and the thickness is 0.01 mm. The second metal sheet is fixed on the side of the length of the dielectric layer.

[0017] Optionally, the relative dielectric constant of the dielectric layer is 10.2, and the loss angle is 0.0023.

[0018] Optionally, the diameter of the feeding hole is 1.5 mm.

[0019] Optionally, the feeding unit is a cylindrical metal conductor.

[0020] Optionally, the diameter of the feeding unit is 0.5 mm, and the height is 5.02 mm.

[0021] In a second aspect, the present application provides a mobile terminal device, including the above-mentioned Wi-Fi antenna.

[0022] According to the specific embodiments provided by the present application, the following technical effects are disclosed by the present application:

[0023] The present application provides a Wi-Fi antenna and a mobile terminal device. The Wi-Fi antenna includes a microstrip antenna structure and a radiation cavity. The dielectric layer of the microstrip antenna structure is located in the radiation cavity, and the wall surface of the radiation cavity is vertically connected or in contact with the ground layer of the microstrip antenna structure. By means of the radiation cavity, while reducing the volume of the Wi-Fi antenna, its radiation intensity is enhanced. While ensuring the antenna characteristics, the volume of the entire structure is reduced. The mobile terminal device equipped with this Wi-Fi antenna can meet the requirements for volume and performance. Description of the Drawings

[0024] To more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0025] Figure 1 It is a top view of a wifi antenna provided by an embodiment of the present application;

[0026] Figure 2 For Figure 1 is a front cross-sectional view;

[0027] Figure 3 It is a voltage standing wave ratio (VSWR) simulation curve graph of a wifi antenna provided by another embodiment of the present application;

[0028] Figure 4 It is an E-plane and H-plane gain curve graph of a wifi antenna provided by another embodiment of the present application when the operating frequency is 2.402 GHz;

[0029] Figure 5 It is an E-plane and H-plane gain curve graph of a wifi antenna provided by another embodiment of the present application when the operating frequency is 2.45 GHz;

[0030] Figure 6 It is an E-plane and H-plane gain curve graph of a wifi antenna provided by another embodiment of the present application when the operating frequency is 2.4835 GHz.

[0031] Explanation of the reference signs in the drawings:

[0032] 1 - Center point;

[0033] 2 - Feeding point;

[0034] 3 - Radiation layer;

[0035] 4 - Dielectric layer;

[0036] 5 - Ground layer;

[0037] 6 - Feeding hole;

[0038] 7 - Feeding unit;

[0039] 81 - First metal sheet;

[0040] 82 - Second metal sheet. Detailed implementation manners

[0041] The following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts shall fall within the scope of protection of the present application.

[0042] In the description of the present application, it should be noted that unless otherwise clearly defined and limited, the terms "installed", "connected", and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, or indirectly connected through an intermediate medium, and can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0043] In the description of the present application, it should be understood that the terms used, including "upper", "lower", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., are used to indicate the orientation or position relationship, and are based on the orientation or position relationship shown in the accompanying drawings. It is only for the convenience of describing the device or method of the present application, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present application.

[0044] In the description of the present application, the terms "first", "second", "third", etc. existing in the description of the present application and the claims and the above accompanying drawings are used to distinguish similar objects, and do not necessarily need to describe a specific order or sequence. It should be understood that such objects can be interchanged under appropriate circumstances, so that the embodiments of the present application described here can be implemented in an order other than those illustrated or described here, for example.

[0045] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiments or examples are included in at least one embodiment or example of the present application. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0046] To make the above objects, features, and advantages of the present application more obvious and understandable, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0047] WiFi technology has been widely applied to various wireless communication devices and has become an indispensable part of the wireless transmission field. Currently, there are various forms of antennas suitable for WiFi technology, meeting the requirements of different application scenarios. These antennas are generally designed by conventional methods. Some of these antennas have a large area, while others have a high height. In the special field of electromagnetic information transmission, the volume of the carrier applying WiFi technology is strictly limited. It is required that the WiFi antenna has a small area and a low height while ensuring certain performance. For example, the WiFi antenna applied to a protective tablet computer not only requires good omnidirectional radiation characteristics and high gain, but also especially requires a small area and a low profile. Conventional WiFi antennas are difficult to meet these requirements.

[0048] In an exemplary embodiment, as Figure 1 and Figure 2 shown, a WiFi antenna, a microstrip antenna structure and a radiation cavity are provided. The dielectric layer 4 of the microstrip antenna structure is located in the radiation cavity, and the wall surface of the radiation cavity is perpendicularly connected or in contact with the ground layer 5 of the microstrip antenna structure.

[0049] The WiFi antenna provided in the above embodiment enhances its radiation intensity on the basis of reducing the volume of the WiFi antenna by arranging a radiation cavity around the microstrip antenna structure, reduces the volume of the entire structure while ensuring the antenna characteristics, so as to meet the diverse scenario requirements.

[0050] In another exemplary embodiment of the present application, in order to determine the bandwidth and radiation performance of the WiFi antenna and achieve a structure with a small area and a low profile, on the basis of the above embodiment, each structure is further described:

[0051] Further, the microstrip antenna structure includes a PCB board and a feeding unit 7; wherein:

[0052] The PCB board includes a radiation layer 3, a dielectric layer 4 and a ground layer 5 stacked in sequence. A feeding point 2 is provided on the radiation layer 3. Feeding holes 6 are opened on the dielectric layer 4 and the ground layer 5. The feeding unit 7 is arranged in the feeding holes 6, and one end of the feeding unit 7 away from the ground layer 5 is connected to the feeding point 2.

[0053] As an embodiment, in order to facilitate the manufacturing of the above structure and the determination of the polarization direction, the axial direction of the feeding hole 6 is perpendicular to the plane of the PCB board, and the feeding point 2 is coaxially arranged with the feeding hole 6.

[0054] As an exemplary one, both the radiation layer 3 and the ground layer 5 are metal layers;

[0055] Furthermore, the radiation layer 3, the dielectric layer 4, and the grounding layer 5 are all rectangular. The center points 1 of the radiation layer 3, the dielectric layer 4, and the grounding layer 5 are located on the same central axis, and the feeding point 2 is located on the central axis.

[0056] Specifically, the length of the dielectric layer 4 is the same as that of the grounding layer 5, and the width of the dielectric layer 4 is the same as that of the metal grounding layer 5. The radiation layer 3 is the radiation patch of the antenna, and its length and width are obtained according to the operating frequency of the antenna, the thickness of the dielectric layer 4, and the dielectric constant.

[0057] Specifically, by selecting a dielectric material with a relatively high relative dielectric constant as the dielectric layer 4, the area of the antenna can be reduced by more than 1 / 2.

[0058] Further optionally, the dielectric layer 4 can be a Rogers RT / duroid 6010 dielectric board.

[0059] Furthermore, the relative dielectric constant of the dielectric layer 4 is 10.2, and the loss angle is 0.0023.

[0060] Furthermore, the specific dimensions of the PCB board are as follows:

[0061] The length of the radiation layer 3 is 20.10 mm, the width is 16.0 mm, and the thickness is 0.01 mm;

[0062] The length of the dielectric layer 4 is 32 mm, the width is 29 mm, and the thickness is 5 mm;

[0063] The length of the grounding layer 5 is 32 mm, the width is 29 mm, and the thickness is 0.01 m;

[0064] The distance between the feeding point 2 and the center point 1 is 2.45 mm;

[0065] Furthermore, the diameter of the feeding hole 6 is 1.5 mm.

[0066] Specifically, after passing through the grounding layer 5 and the dielectric layer 4, the feeding unit 7 is connected to the feeding point 2 of the radiation layer 3; according to the design of the feeding hole 6, the feeding unit 7 does not contact the metal grounding layer 5.

[0067] Furthermore, the feeding unit 7 is a cylindrical metal conductor.

[0068] As an embodiment, the diameter of the feeding unit 7 is 0.5 mm, and the height is 5.02 mm.

[0069] Furthermore, the radiation cavity is composed of a metal wall, and the wall surface of the metal wall is vertically connected or in contact with the grounding layer 5.

[0070] Specifically, the radiation cavity is composed of a metal wall, which is arranged around the microstrip antenna structure and connected to the ground layer 5. It can be used to increase the surface area of the ground layer 5, enhance the radiation intensity, improve the impedance matching, increase the bandwidth of the antenna, and solve the problem of insufficient bandwidth caused by the reduction of the volume of the conventional antenna.

[0071] Further, the metal wall includes a first metal sheet 81 and a second metal sheet 82, where:

[0072] The length of the first metal sheet 81 is 29 mm, the width is 3.062 mm, and the thickness is 0.01 mm. The first metal sheet 81 is fixed to the side of the width of the dielectric layer 4.

[0073] The length of the second metal sheet 82 is 32 mm, the width is 3.062 mm, and the thickness is 0.01 mm. The second metal sheet 82 is fixed to the side of the length of the dielectric layer 4.

[0074] Specifically, as Figure 1 and Figure 2 shown, the widths of the first metal sheet 81 and the second metal sheet 82 and the thickness of the PCB board are in the same direction. One side of the length of the first metal sheet 81 is in contact connection or fixed connection with one side of the width of the metal ground layer 5, and one side of the length of the second metal sheet 82 is in contact connection or fixed connection with one side of the length of the metal ground layer 5.

[0075] Figure 3 Fig. is the simulation curve of the voltage standing wave ratio (VSWR) of the above-mentioned wifi antenna; as shown in the figure, for a wifi antenna provided by an embodiment of the present application, in the 2.4 GHz frequency band (frequency range 2.402 GHz - 2.4835 GHz), the antenna voltage standing wave ratio VSWR does not exceed 2.5.

[0076] Figure 4 Fig. is the gain curve of the E-plane and H-plane of the above-mentioned wifi antenna when the operating frequency is 2.402 GHz. The solid line is the gain curve when the azimuth angle phi is 0°, and the dashed line is the gain curve when the azimuth angle phi is 0°. For easy observation, the coordinates of five points m1 to m5 are provided, where Theta, Ang, and Mag represent the polar angle, phase, and amplitude values respectively. As can be seen from the figure, when the operating frequency is 2.402 GHz, the normal gain of the wifi antenna provided by an embodiment of the present application is greater than 2.4 dBi, the gain within 120° is greater than 0.9 dBi, and the gain within 140° is greater than 0.7 dBi.

[0077] Figure 5The E-plane and H-plane gain curves of a Wi-Fi antenna at a working frequency of 2.45 GHz are shown. The solid line represents the gain curve at azimuth angle phi = 0°, and the dashed line also represents the gain curve at azimuth angle phi = 0°. For easy observation, the coordinates of five points m1 to m5 are provided, where Theta, Ang, and Mag represent the polar angle, phase, and amplitude values respectively. As Figure 5 It can be seen that the normal (0°) gain of a Wi-Fi antenna provided by an embodiment of the present application is greater than 4 dBi, the gain within 120° is greater than 0.1 dBi, and the gain within 140° is greater than -1.15 dBi.

[0078] Figure 6 The E-plane and H-plane gain curves of a Wi-Fi antenna at a working frequency of 2.4835 GHz are provided by another embodiment of the present application. The solid line represents the gain curve at azimuth angle phi = 0°, and the dashed line also represents the gain curve at azimuth angle phi = 0°. For easy observation, the coordinates of five points m1 to m5 are provided, where Theta, Ang, and Mag represent the polar angle, phase, and amplitude values respectively. The normal (0°) gain of a Wi-Fi antenna provided by an embodiment of the present application is greater than 2.5 dBi, the gain within 120° is greater than 1.0 dBi, and the gain within 140° is greater than 0.78 dBi.

[0079] In summary, the Wi-Fi antenna provided by an embodiment of the present application is an omnidirectional antenna that can operate in the 2.4 GHz frequency band (frequency range 2.402 GHz - 2.4835 GHz). The antenna uses a microstrip circuit and a dielectric material with a high dielectric constant, reducing the area of the antenna by more than 1 / 2. The metal wall cavity structure improves the impedance matching, increases the bandwidth of the antenna, and solves the problem of insufficient bandwidth caused by the reduction of the volume of conventional antennas. It has the advantages of small area, low profile, and high gain, and is also simple to process and low in cost. Further, a mobile terminal device equipped with this Wi-Fi antenna can meet the requirements for volume and performance.

[0080] Based on the same inventive concept, the present application also provides a mobile terminal device including the above-mentioned Wi-Fi antenna.

[0081] Optionally, the mobile terminal device is a rugged tablet. A rugged tablet is a ruggedized mobile computing device designed for harsh environments, with features such as drop resistance, waterproofing, dustproofing, and resistance to extreme temperatures, and can operate stably in special scenarios such as industrial, outdoor, and military. Compared with ordinary consumer-grade tablets, the Wi-Fi antenna installed on a rugged tablet pursues better omnidirectional radiation characteristics and higher gain, and especially requires a small area and a low profile.

[0082] A Wi-Fi antenna provided by the present application can meet the application requirements of a protective laptop computer for a Wi-Fi antenna, and can also be used in mobile terminal devices with special requirements for the volume and performance of the Wi-Fi antenna.

[0083] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered that the scope described in this specification.

[0084] Specific examples are used in this article to elaborate on the principles and implementation manners of the present application. The descriptions of the above embodiments are only used to help understand the method and its core idea of the present application; at the same time, for those of ordinary skill in the art, according to the idea of the present application, there will be changes in the specific implementation manners and application scopes. In summary, the content of this specification should not be construed as a limitation to the present application.

Claims

1. A wifi antenna, characterized in that, Comprising: A microstrip antenna structure and a radiation cavity, wherein the dielectric layer of the microstrip antenna structure is located in the radiation cavity, and the wall surface of the radiation cavity is vertically connected or in contact with the grounding layer of the microstrip antenna structure.

2. The wifi antenna according to claim 1, characterized in that, The radiation cavity is composed of a metal wall, and the wall surface of the metal wall is vertically connected or in contact with the grounding layer.

3. The wifi antenna according to claim 2, characterized in that, The microstrip antenna structure includes a PCB board and a feeding unit; wherein: The PCB board includes a radiation layer, the dielectric layer and the grounding layer stacked in sequence. A feeding point is provided on the radiation layer, feeding holes are formed in the dielectric layer and the grounding layer, the feeding unit is arranged in the feeding holes, and one end of the feeding unit far from the grounding layer is connected to the feeding point.

4. The wifi antenna according to claim 3, characterized in that, The radiation layer, the dielectric layer and the grounding layer are all rectangular, the central points of the radiation layer, the dielectric layer and the grounding layer are located on the same central axis, and the feeding point is located on the central axis.

5. The wifi antenna according to claim 3, characterized in that, The length of the radiation layer is 20.10 mm, the width is 16.0 mm, and the thickness is 0.01 mm; The length of the dielectric layer is 32 mm, the width is 29 mm, and the thickness is 5 mm; The length of the grounding layer is 32 mm, the width is 29 mm, and the thickness is 0.01 m; The distance between the feeding point and the central point is 2.45 mm; The metal wall includes a first metal sheet and a second metal sheet. The length of the first metal sheet is 29 mm, the width is 3.062 mm, and the thickness is 0.01 mm. The first metal sheet is fixed on the side of the width of the dielectric layer. The length of the second metal sheet is 32 mm, the width is 3.062 mm, and the thickness is 0.01 mm. The second metal sheet is fixed on the side of the length of the dielectric layer.

6. The wifi antenna according to claim 4, characterized in that, The relative dielectric constant of the dielectric layer is 10.2, and the loss angle is 0.0023.

7. The wifi antenna according to claim 4, characterized in that, The diameter of the feeding hole is 1.5 mm.

8. The wifi antenna according to claim 6, wherein The feeding unit is a cylindrical metal conductor.

9. The wifi antenna according to claim 6, wherein The diameter of the feeding unit is 0.5 mm, and the height is 5.02 mm.

10. A mobile terminal device, characterized in that, Including the wifi antenna according to any one of claims 1-9.

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