Antenna structures and electronics

Abstract

The present application discloses an antenna structure and an electronic device, the antenna structure comprising: the antenna structure comprising a metal frame, the metal frame comprising a first resonant arm and a second resonant arm, a grounding point being arranged between the first resonant arm and the second resonant arm, the grounding point being connected to a metal arm for setting a first ground return path and a second ground return path, the position of the metal arm of the second ground return path corresponding to the position of the second resonant arm, a first clearance area being formed on one side of the metal arm of the first resonant arm and the second ground return path, a second clearance area being formed in an area between the second resonant arm and the metal arm of the second ground return path, an NFC sensing device and other high-frequency antennas being co-structured, high-frequency and low-frequency clearance paths being separated, and a section of the metal frame being segmented out for designing a high-frequency antenna or a portion of a high-frequency antenna without reducing a magnetic field penetration area, so that the antenna layout is more flexible.

Description

Technical Field

[0001] The present application belongs to the field of antenna technology, and specifically relates to an antenna structure and an electronic device. Background Art

[0002] With the rapid update and replacement of mobile terminals, the number of antenna operating frequency bands is increasing. Simply increasing the number of antennas has gradually become a bottleneck in product design. Therefore, some compatible design requirements are put forward for antenna design. For example, the Near Field Communication (NFC) sensing device is combined with the terminal antenna design, and the NFC antenna and the terminal antenna are set on the frame at the same time.

[0003] When designing compatibility between the NFC sensing device and the terminal antenna, it is impossible to simultaneously meet the card reading area required by the NFC sensing device and the frame size required by the high-frequency antenna. If the sensing area of ​​the NFC sensing device is met, the frame size that can be used for the design of the high-frequency antenna is too small, and only some ultra-high frequency band antennas can be designed, making it impossible to achieve compatible design of the NFC sensing device with more types of antennas. Summary of the invention

[0004] The present application aims to provide an antenna structure and an electronic device, which, at least when the NFC sensing device and the terminal antenna are designed to be compatible, cannot simultaneously meet the card reading area required by the NFC sensing device and the frame size required by the high-frequency antenna, and cannot achieve one of the problems of compatible design of the NFC sensing device with more types of antennas.

[0005] In order to solve the above technical problems, this application is implemented as follows:

[0006] In the first aspect, an embodiment of the present application proposes an antenna structure, comprising: a metal frame, the metal frame comprising a first resonant arm and a second resonant arm, a grounding point is set between the first resonant arm and the second resonant arm, the grounding point is connected to a metal arm for setting a first ground return path and a second ground return path on one side of the metal frame, the position of the metal arm of the second ground return path corresponds to the position of the second resonant arm, the metal arm of the first resonant arm and the metal arm of the second ground return path are used to constitute a first antenna unit, the second resonant arm, the metal arm of the first ground return path and the metal arm of the second ground return path are used to constitute a second antenna unit, a first clearance area is formed on one side of the metal arm of the first resonant arm and the second ground return path, a second clearance area is formed in the area between the second resonant arm and the second ground return path, and the frequency band corresponding to the second antenna unit is higher than the frequency band corresponding to the first antenna unit.

[0007] In a second aspect, an embodiment of the present application proposes an electronic device, including: the antenna structure as described above.

[0008] In an embodiment of the present application, an antenna structure includes a metal frame, the metal frame includes a first resonant arm and a second resonant arm, a grounding point is set between the first resonant arm and the second resonant arm, a first ground return path and a second ground return path are respectively set at the grounding point on one side of the metal frame, the position of the metal arm of the second ground return path corresponds to the position of the second resonant arm, the first resonant arm and the second ground return path The metal arm is used to constitute a first antenna unit, the second resonant arm, the metal arm of the first ground return path, and the metal arm of the second ground return path are used to constitute a second antenna unit, a first clearance area is formed on one side of the first resonant arm and the metal arm of the second ground return path, and a second clearance area is formed in an area between the second resonant arm and the second ground return path. The frequency band corresponding to the second antenna unit is higher than the frequency band corresponding to the first antenna unit, and a co-structure of the NFC sensing device and other high-frequency antennas is realized, so that the high-frequency and low-frequency clearance paths are separated, and a section of the metal frame is divided out for designing a high-frequency antenna or a portion of a high-frequency antenna without reducing the magnetic field penetration area, so that the antenna layout is more flexible.

[0009] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0011] Figure 1 is a structural schematic diagram of an antenna structure according to an embodiment of the present invention;

[0012] Figure 2 is another structural schematic diagram of an antenna structure according to an embodiment of the present invention;

[0013] Figure 3 is a structural schematic diagram of an electronic device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0014] Embodiments of the present invention will be described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0015] The term "first" or "second" in the specification and claims of the present application may include one or more of the features explicitly or implicitly. In the description of the present invention, unless otherwise specified, "plurality" means two or more. In addition, "and / or" in the specification and claims means at least one of the connected objects, and the character " / " generally means that the objects connected before and after are in an "or" relationship.

[0016] In the description of the present invention, it is necessary to understand that the terms "length", "width", "thickness", "up", "down", "front", "back", etc. indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, 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 on the present invention.

[0017] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0018] Combine the following Figure 1 Describe the antenna structure according to the embodiment of the present invention

[0019] like Figure 1 As shown, the antenna structure 100 according to some embodiments of the present invention includes: a metal frame, the metal frame includes a first resonant arm 101 and a second resonant arm 102, a grounding point B is set between the first resonant arm 101 and the second resonant arm 102, on one side of the metal frame, the grounding point B is connected to a metal arm used to set a first ground return path 111 and a second ground return path 112, the position of the metal arm of the second ground return path 112 corresponds to the position of the second resonant arm 102, the metal arm of the first resonant arm 101 and the metal arm of the second ground return path 112 are used to constitute a first antenna unit, the second resonant arm 102, the metal arm of the first ground return path 111 and the metal arm of the second ground return path 112 are used to constitute a second antenna unit, and on one side of the metal arm of the first resonant arm 101 and the metal arm of the second ground return path 112

[0020] A first clearance area is formed, and the area between the second resonant arm 102 and the metal arm of the second ground return path 112 forms a second clearance area 140. The frequency band corresponding to the second antenna unit is higher than the frequency band corresponding to the first antenna unit.

[0021] The metal frame is divided into an AB segment and a BC segment, wherein the AB segment is the first resonant arm 101, and the BC segment is the second resonant arm 102. The return path of the first resonant arm 101 is the second return path 112 corresponding to the BD segment metal arm. The return path of the second resonant arm 102 includes a first return path 111 corresponding to the BE segment metal arm and a second return path 112 corresponding to the BD segment metal arm.

[0022] Further, the first ground return path 111 is a non-DC conductive path, a capacitive component is connected to the first ground return path 111, and the second ground return path 112 is a DC conductive path connected to DC ground, wherein the signal of the first antenna unit can flow on the DC conductive path but cannot flow on the non-DC conductive path.

[0023] like Figure 1 The grid area shown is the first clearance area 120 corresponding to the first antenna unit, and the horizontal stripe area between the second resonant arm 102 and the second ground return path 112 is the second clearance area 140 of the second antenna unit. The second clearance area 140 can be filled with non-metallic material.

[0024] In one implementation, the frequency band corresponding to the first antenna unit includes at least one of the following:

[0025] Low frequency (LF): 30KHz to 300KHz;

[0026] Very low frequency (VLF): 3KHz to 30KHz.

[0027] In one implementation, the first antenna unit is used in an NFC sensing device. For simplicity, the following embodiments are all described by taking the NFC sensing device as an example.

[0028] In one implementation, the frequency band corresponding to the second antenna unit may be designed according to actual needs, and may include at least one of the following:

[0029] Mid High Band (MHB): 1.71 GHz to 2.69 GHz;

[0030] High Band (HB): 1.71 GHz to 2.17 GHz;

[0031] Very High Band (VHB): 30MHz to 300MHz;

[0032] Ultra High Band (UHB): above 3GHz.

[0033] The first clearance area is filled with non-metallic material to form a non-metallic part, which can achieve the effect of NFC magnetic field penetration.

[0034] Furthermore, if Figure 2 As shown, when the antenna structure 100 is set on a terminal device, the frame of the terminal device can be used as the metal frame of the antenna structure 100, and the metal arms of the first return path and the second return path are set on the side of the conductive layer 130 close to the screen.

[0035] The conductive layer is an indium tin oxide (ITO) layer.

[0036] Furthermore, a first clearance area 120 between the first resonant arm 101 and the conductive layer 130 of the screen, and between the second ground return path 112 and the conductive layer 130 of the screen is filled with non-metallic material. Figure 2 As shown, the lower side of the first clearance area 120 is connected to the LCM panel ITO boundary.

[0037] The second ground return path 112 can be connected through a copper wire with a certain width on a flexible printed circuit (FPC), is DC-grounded, has a DC conduction characteristic, and can pass NFC signals.

[0038] The projection area corresponding to the second antenna unit has FPC copper routing, which is above the ITO routing of the screen to avoid absorption of high-frequency electromagnetic waves corresponding to the second antenna unit in the area corresponding to the FPC. At the same time, in the part outside the FPC routing, the high-frequency electromagnetic waves are absorbed by the ITO routing and connected to the capacitive component through the copper wire of the first return ground path 111 to form a high-frequency grounding.

[0039] The metal layer in the area where the first clearance area 120 is located is hollowed out and filled with non-metallic materials to achieve the effect of NFC magnetic field penetration. Since the resistivity of ITO is higher than that of metal, ITO is not a complete metal plane, and it does not have an obvious loop and is not enough to hinder the penetration of the magnetic field, so this part is the NFC magnetic field penetrable area. Among them, the first clearance areas 121 and 122 corresponding to the metal arms of the second return path are high-frequency electromagnetic wave impedance absorption boundaries.

[0040] Furthermore, the area of ​​the first clearance region 120 is within the range corresponding to the conductive layer of the screen.

[0041] The lengths of the first resonant arm 101 and the second resonant arm 102 can be designed according to actual needs. In the case where the high-frequency and low-frequency clearance paths are not separated, NFC requires a frame length of about 40 mm as the first resonant arm 101 to achieve good NFC performance. Based on the antenna structure 100 of the embodiment of the present application, part of the frame size can be separated and provided for use in other antenna designs.

[0042] In one embodiment, the length of the first resonant arm 101 is greater than the length of the second resonant arm, the size of the first resonant arm 101 is designed to be about 30 mm, the size of the second resonant arm 102 is designed to be about 10 mm, the width of the copper trace on the FPC is designed to be about 1 mm, and the length and width of the first clearance area 122 are designed to be 10 mm and 2 mm respectively. Figure 2 As shown, the grid-filled portion is the area through which the NFC magnetic field can penetrate, which satisfies the card reading area required by the NFC sensing device and ensures the effective performance of the NFC sensing device; at the same time, the second resonant arm 102 is 10 mm long and can be constructed into an MHB coupling branch or designed as a UHB band antenna, which effectively solves the design of other antennas affected by the NFC size.

[0043] The length of the second resonant arm 102 can be flexibly adjusted according to antenna design requirements.

[0044] In one implementation, the second resonant arm 102 is used to construct an MHB parasitic branch, which can effectively expand the efficiency bandwidth of the MHB antenna.

[0045] In another embodiment, the second resonant arm 102 is used to construct an MHB parasitic branch, the MHB antenna is designed as a broadband antenna, and the L5 frequency band (1176.45±1.023MHz) is designed, thereby effectively improving the efficiency of the L1 frequency band (1575.42±1.023MHz).

[0046] In another embodiment, the second resonant arm 102 is used to design an independent HB or UHB antenna.

[0047] According to the antenna structure of the embodiment of the present invention, through the metal frame, the metal frame includes a first resonant arm and a second resonant arm, a grounding point is set between the first resonant arm and the second resonant arm, the grounding point is connected to the metal arm used to set the first ground return path and the second ground return path on one side of the metal frame, the position of the metal arm of the second ground return path corresponds to the position of the second resonant arm, the metal arm of the first resonant arm and the metal arm of the second ground return path are used to constitute a first antenna unit, the second resonant arm, the metal arm of the first ground return path and the metal arm of the second ground return path are used to constitute a second antenna unit, a first clearance area is formed on one side of the metal arm of the first resonant arm and the second ground return path, a second clearance area is formed in the area between the second resonant arm and the second ground return path, the frequency band corresponding to the second antenna unit is higher than the frequency band corresponding to the first antenna unit, the NFC sensing device and other high-frequency antennas are co-structured, the high-frequency and low-frequency clearance paths are separated, and a section of the metal frame is divided out for designing a high-frequency antenna or a portion of a high-frequency antenna without reducing the magnetic field penetration area, so that the antenna layout is more flexible.

[0048] like Figure 3 As shown, an embodiment of the present application provides an electronic device, which may be a mobile terminal. The electronic device includes the antenna structure 100 and a screen as described above, and a metal frame of the electronic device serves as a metal frame of the antenna structure 100 to form a first resonant arm and a second resonant arm.

[0049] Furthermore, a non-metallic material is provided between the first resonant arm of the antenna structure and the conductive layer of the screen, and between the second ground return path of the antenna structure and the conductive layer of the screen.

[0050] Furthermore, the area of ​​the first clearance region is within the range corresponding to the conductive layer of the screen.

[0051] Furthermore, the conductive layer is an indium tin oxide layer.

[0052] Therefore, the embodiment of the present application realizes a common structure of the NFC sensing device and other high-frequency antennas by setting the antenna structure as described above in the electronic device, separating the high-frequency and low-frequency clearance areas, and dividing a section of the metal frame for designing the high-frequency antenna or a section of the high-frequency antenna without reducing the magnetic field penetration area, so that the antenna layout is more flexible.

[0053] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0054] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. An electronic device, characterized in that: The invention comprises a screen and an antenna structure, wherein the antenna structure comprises: a metal frame, wherein the metal frame comprises a first resonant arm and a second resonant arm, wherein the first resonant arm and the second resonant arm are collinearly arranged and a grounding point is arranged between them, wherein the antenna structure comprises a metal arm for setting a first ground return path and a metal arm for setting a second ground return path on the inner side of the metal frame, wherein the metal arms of the first ground return path and the second ground return path are arranged on a side of a conductive layer close to the screen, wherein the grounding point connects the metal arm for setting the first ground return path and the metal arm of the second ground return path, wherein the position of the metal arm of the second ground return path corresponds to the position of the second resonant arm, and the metal arm of the second ground return path is located at the position corresponding to the second resonant arm. The metal arm of the first ground return path extends from the grounding point to the inner side of the metal frame and is respectively located on the first and second ground return arms on both sides. The first and second ground return paths are used to form a first antenna unit. The second resonant arm, the metal arm of the first ground return path and the metal arm of the second ground return path are used to form a second antenna unit. A first clearance area is formed on the inner sides of the first resonant arm and the metal arm of the second ground return path. A second clearance area is formed in the area between the second resonant arm and the metal arm of the second ground return path. The frequency band corresponding to the second antenna unit is higher than the frequency band corresponding to the first antenna unit. A non-metallic part is arranged between the first resonant arm of the antenna structure and the conductive layer of the screen, and between the second ground return path of the antenna structure and the conductive layer of the screen, the lower side of the first clearance area is connected to the edge of the conductive layer of the screen, and the conductive layer is a tin indium oxide layer; The first return path to ground is a non-DC conductive path, the first return path is grounded at high frequency through a capacitive component, and the second return path to ground is a DC conductive path; the first antenna unit is used for an NFC sensing device.

2. The electronic device according to claim 1, characterized in that: The frequency band corresponding to the first antenna unit includes at least one of the following: Low frequency; Very low frequency.

3. The electronic device according to any one of claims 1-2, characterized in that: The frequency band corresponding to the second antenna unit includes at least one of the following: Mid-high frequency; high frequency; Very high frequency; Ultra high frequency.

4. The electronic device according to claim 1, characterized in that: The area of ​​the first clearance region is within the range corresponding to the conductive layer of the screen.

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