Antenna devices and electronic equipment

Abstract

An antenna device is disclosed, applicable to electronic devices with flexible screens that can be bent at a hinge. The flexible screen includes a main screen and a sub-screen connected by the hinge. The antenna device may include a first metal strip disposed on the main screen bezel near the hinge end, and a second metal strip disposed on the sub-screen bezel near the same end of the bezel. The first metal strip may employ a dual-feed design to achieve multiple antennas. When the flexible screen is in a folded state, the first metal strip can couple with the second metal strip to generate radiation, at which point the second metal strip can act as a parasitic antenna for the first metal strip. This effectively utilizes the second metal strip on the sub-screen bezel, improving the radiation efficiency of the first metal strip on the main screen bezel, optimizing the antenna performance of the first metal strip when the flexible screen is in a folded state, and reducing the performance gap between the folded and open states of the flexible screen.

Description

[0001] This application claims priority to Chinese patent application filed on February 22, 2019, with application number 201910136437.0, entitled "Antenna Device and Electronic Equipment", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This invention relates to the field of antenna technology, and in particular to antenna devices used in electronic devices. Background Technology

[0003] With the development of mobile communication technology and the widespread adoption of smartphones, smartphone design has evolved from large screens, full-screen displays, and wraparound screens to foldable screens in pursuit of a better user experience, novel appearance, and functionality. This evolution also relies on the development of flexible screen technology. Foldable screens in smartphones and other electronic devices have brought new possibilities to the functional design of electronic devices, enabling them to be applicable to and cover more new application scenarios. At the same time, foldable screens have also brought new challenges and possibilities to the antenna design of electronic devices. Summary of the Invention

[0004] This invention provides an antenna device based on the flexible screen architecture of an electronic device. It can effectively utilize the second metal strip set on the bezel of the secondary screen to improve the radiation efficiency of the first metal strip set on the bezel of the main screen, optimize the antenna performance of the first metal strip when the flexible screen is in a folded state, and reduce the difference in antenna performance between the flexible screen in a folded state and the flexible screen in an open state.

[0005] Firstly, this application provides an antenna device for an electronic device, which may include a flexible screen, a hinge, and a frame. The flexible screen may include a main screen and a secondary screen. The hinge connects the main screen and the secondary screen. The width of the main screen and the width (w2) of the secondary screen may be equal or unequal. The frame of the electronic device may include a frame for the main screen and a frame for the secondary screen. In this application, the main screen may be referred to as the first screen, and the secondary screen as the second screen. The flexible screen may be bent at the hinge. Here, bending may include bending the flexible screen outwards or bending it inwards.

[0006] The antenna device may include a first metal strip and a second metal strip. The first metal strip is open at both ends, having a first open end and a second open end. The first metal strip may have a first feed point near the first open end and a second feed point near the second open end. The first feed point may be connected to the matching circuit of a first antenna (e.g., a diversity antenna), and the second feed point may be connected to the matching circuit of a second antenna (e.g., a GPS antenna). A first grounding point may be provided on the first metal strip between the first and second feed points. One end of the second metal strip is open, and the other end is grounded. A first connection point may be provided on the second metal strip, connecting to a first filter. The operating frequency band of the first filter may include the radiation frequency band of the first antenna (e.g., a low-frequency band) and the radiation frequency band of the second antenna (e.g., a GPS band). The first metal strip may be disposed on the frame of a first screen near the first end of the pivot; the second metal strip may be disposed on the frame of a second screen near the first end of the pivot. When the flexible screen is in a folded state, the first metal strip can couple with the second metal strip to generate radiation in the radiation frequency band of the first antenna. This improves the antenna performance of the first metal strip in both the first antenna's radiation frequency band (e.g., low-frequency band) and the second antenna's radiation frequency band (e.g., GPS band). In this case, the second metal strip can function as a parasitic structure of the first metal strip.

[0007] By implementing the antenna device provided in the first aspect, the second metal strip set on the sub-screen bezel can be effectively used. Since the first filter is set on the second metal strip on the sub-screen bezel, the radiation efficiency of the first metal strip set on the main screen bezel is improved when the flexible screen is in the folded state, the antenna performance of the first metal strip when the flexible screen is in the folded state is optimized, and the difference in antenna performance between the flexible screen in the folded state and the flexible screen in the open state is reduced.

[0008] In conjunction with the first aspect, in some alternative embodiments, a second filter can also be disposed on the side of the first metal strip near the first open end. The second filter can present a bandpass to ground in the radiation frequency band of the second antenna (such as the GPS band). The introduction of the second filter can create a boundary condition: the radiator between the first grounding point and the second connection point of the second filter is closed at both ends, with both ends being points of high current. The 1 / 4 wavelength mode of the radiator between the second filter and the first open end can also generate resonance in the radiation frequency band of the second antenna. This supplements the resonance in the radiation frequency band of the second antenna, thereby improving the radiation performance of the second antenna. Moreover, by providing the second filter, the isolation between the first antenna and the second antenna can be further improved.

[0009] In conjunction with the first aspect, in some alternative embodiments, the second filter may be located at the first feed point, or located between the first feed point and the first ground point, close to the first feed point.

[0010] In conjunction with the first aspect, in some optional embodiments, the frame of the first screen can be a metal frame, in which case the frame of the first screen has a metallic appearance, and the first metal strip can be formed by this metal frame. Specifically, two gaps can be made in the metal frame: a first gap and a second gap, and a section of the metal frame between these two gaps can serve as the first metal strip. One of these two gaps can be made at a position close to the first end of the pivot. Here, "close to" means that the distance between the gap and the pivot is less than a first preset distance (e.g., 2 mm).

[0011] In conjunction with the first aspect, in some optional embodiments, the frame of the first screen may include a first frame portion and a second frame portion. The first frame portion is metallic (metallic appearance), and the second frame portion is non-metallic (non-metallic appearance). One end of the first frame portion is connected to the first end of the pivot, and the other end of the first frame portion is connected to the second frame portion; this other end is open. A gap may be provided on the first frame portion near the first end of the pivot. Here, this gap can be referred to as a third gap, and the third gap can be the aforementioned first gap. Here, "near" means that the distance between the gap and the pivot is less than a first preset distance (e.g., 2 mm). A metal frame between the gap and the other end of the first frame portion can serve as a first metal strip.

[0012] In conjunction with the first aspect, in some optional embodiments, the bezel of the first screen can be a non-metallic bezel (such as a plastic bezel, a glass bezel, etc.). In this case, the appearance of the main screen bezel is non-metallic (such as plastic, glass, etc.). The first metal strip can be a metal strip pasted to the inner surface of the non-metallic bezel, or it can be printed on the inner surface of the non-metallic bezel using conductive silver paste.

[0013] In conjunction with the first aspect, in some optional embodiments, the frame of the first screen can be a metal frame, in which case the frame of the first screen has a metallic appearance, and the second metal strip can be formed by this metal frame. Specifically, a second grounding point can be provided on the metal frame, and a gap can be opened on the metal frame near the first end of the pivot. Here, "near" means that the distance between the gap and the pivot is less than a second preset distance (e.g., 2 mm). The section of the metal frame between the gap and the second grounding point can serve as the second metal strip. Here, this gap can be referred to as the fourth gap.

[0014] In conjunction with the first aspect, in some optional embodiments, the frame of the first screen can be a non-metallic frame (such as a plastic frame, glass frame, etc.), in which case the frame of the first screen has a non-metallic appearance. The second metal strip can be a metal strip pasted to the inner surface of the non-metallic frame, or it can be printed on the inner surface of the non-metallic frame using conductive silver paste.

[0015] In conjunction with the first aspect, in some alternative embodiments, the length of the first metal strip may be greater than the length of the second metal strip.

[0016] In conjunction with the first aspect, in some alternative embodiments, the second filter may be included in the matching circuit of the first antenna (such as a diversity antenna), in which case the second connection point 31-4 of the second filter and the first feed point 31-1 may coincide.

[0017] In conjunction with the first aspect, in some alternative embodiments, the distance between the first connection point 32-3 and the open end 32-5 of the first filter 32-4 is less than a third preset distance value.

[0018] In conjunction with the first aspect, in some optional embodiments, the distance between the connection point 32-3 of the first filter 32-4 and the second grounding point 32-1 is less than a fourth preset distance. In this case, the distance between the connection point 32-3 of the first filter 32-4 and the second grounding point 32-1 is closer than the distance between the connection point 32-3 of the first filter 32-4 and the open end 32-5 (or the gap 32-2). That is to say, the position of the first filter 32-4 on the metal strip 13-3 can be selected in various ways, and this application does not limit it.

[0019] Secondly, this application provides an electronic device that may include a flexible screen, a hinge, a frame, and the antenna device described in the first aspect. The flexible screen may include a first screen and a second screen, which are connected by a hinge; the flexible screen can be folded at the hinge and may have a folded state and an unfolded state; the frame may include the frame of the first screen and the frame of the second screen. Additionally, the electronic device may also include a printed circuit board (PCB) and a back cover. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the embodiments of this application will be described below.

[0021] Figures 1A-1C This is a schematic diagram of the structure of an electronic device provided in one embodiment of this application;

[0022] Figures 2A-2D These are schematic diagrams of several antenna devices provided in this application;

[0023] Figures 3A-3C This is a schematic diagram of the antenna structure provided in this application in an electronic device;

[0024] Figures 4A-4C This is a schematic diagram of an antenna design scheme provided in one embodiment of this application;

[0025] Figures 5A-5B yes Figures 4A-4BSome simulation diagrams of the antenna design scheme shown;

[0026] Figure 6 yes Figures 4A-4B Another simulation diagram of the antenna design scheme shown;

[0027] Figures 7A-7B This is a schematic diagram of an antenna design scheme provided in another embodiment of this application;

[0028] Figures 8A-8B This is a schematic diagram of an antenna design scheme provided in another embodiment of this application;

[0029] Figures 9A-9B This is a schematic diagram of an antenna design provided in another example of this application;

[0030] Figures 10A-10B These are schematic diagrams of antenna design schemes provided in some further examples of this application. Detailed Implementation

[0031] The embodiments of the present invention will now be described with reference to the accompanying drawings.

[0032] The technical solutions provided in this application are applicable to electronic devices employing one or more of the following communication technologies: Global System for Mobile Communications (GSM), Code Division Multiple Access (CDMA), Wideband Code Division Multiple Access (WCDMA), General Packet Radio Service (GPRS), Long Term Evolution (LTE), Wi-Fi, 5G, mmWave, Sub-6G, and other future communication technologies. The following embodiments do not emphasize the requirements of the communication network; they only illustrate the antenna's operating characteristics based on frequency bands. In this application, the electronic device can be a mobile phone, tablet computer, personal digital assistant (PDA), or other electronic devices.

[0033] Figure 1A An example is shown of the electronic device on which the antenna design provided in this application is based. For example... Figure 1AAs shown, the electronic device may include a flexible screen 11, a hinge 13, and a frame. The flexible screen 11 may include a main screen 11-1 and one or more sub-screens 11-3. For simplicity, only one sub-screen 11-3 is shown in the figures. The hinge 13 connects the main screen 11-1 and the sub-screens 11-3. The width (w1) of the main screen 11-1 and the width (w2) of the sub-screen 11-3 may be equal or unequal. In this application, the main screen may be referred to as the first screen, and the sub-screen as the second screen. The frame of the electronic device may include a main screen frame 12-1 and a sub-screen frame 12-3. The main screen frame 12-1 may include three main screen frame portions, two of which may be located near the two ends of the hinge 13, and the third main screen frame portion may be parallel to the hinge 13. Similarly, the secondary screen bezel 12-3 can also include three secondary screen bezel sections, of which two sections can be located near the two ends of the hinge 13, and the third section can be parallel to the hinge 13. The aforementioned bezel can be a metal bezel or a non-metallic bezel (such as a plastic bezel, glass bezel, etc.).

[0034] like Figure 1B As shown, the flexible screen 11 can be bent at the pivot 13. Bending can include bending the flexible screen 11 outwards or inwards. Bending outwards means that after bending, the flexible screen 11 is exposed on the outside, the back cover of the electronic device is exposed on the inside, and the display content on the flexible screen 11 is visible to the user. Bending inwards means that after bending, the flexible screen 11 is hidden on the inside, the back cover of the electronic device is exposed on the outside, and the display content on the flexible screen 11 is not visible to the user. The flexible screen 11 has two modes: an open state and a folded state. The open state can refer to the state where the angle α between the main screen and the sub-screen exceeds a first angle (e.g., 120°). The folded state can refer to the state where the angle α between the main screen and the sub-screen is less than a second angle (e.g., 15°). When the flexible screen 11 is in the open state, the electronic device can... Figure 1A As exemplarily shown; when the flexible screen 11 is in a folded state, the electronic device can... Figure 1C As shown in the example.

[0035] Electronic devices may also include a printed circuit board (PCB) and a back cover, which are not shown.

[0036] based on Figures 1A-1C The following describes the antenna design scheme provided in this application for the electronic device shown.

[0037] The main design concept of this application may include: setting a first metal strip on the main screen frame 12-1 near the hinge 13, and setting a second metal strip on the secondary screen frame 12-3 near the same end of the hinge 13. The first metal strip can be implemented as multiple antennas using a dual-feed design, namely the first antenna (such as a diversity antenna) and the second antenna (such as a GPS antenna) mentioned later. When the flexible screen 11 is in a folded state, the first metal strip can couple with the second metal strip to generate radiation, at which time the second metal strip can act as a parasitic antenna of the first metal strip. In this way, the second metal strip set on the secondary screen frame 12-3 can be effectively used to improve the radiation efficiency of the first metal strip set on the main screen frame 12-1, optimize the antenna performance of the first metal strip when the flexible screen 11 is in a folded state, and reduce the difference in antenna performance between the flexible screen 11 in a folded state and the flexible screen 11 in an open state.

[0038] First, combined Figures 2A-2D This application provides an overview of the antenna design scheme.

[0039] Figure 2A A simplified illustration shows a multi-antenna design implemented using a dual-fed configuration with the first metal strip. (As shown...) Figure 2A As shown, the first metal strip can be open at both ends, including a first open end and a second open end. The second open end is closer to the pivot 13 than the first open end. The first metal strip can have two feed points: feed 1 and feed 2. Feed 1 can be called the first feed point, and feed 2 can be called the second feed point. The first feed point can be a diversity antenna feed point, connected to the diversity antenna matching circuit. The second feed point can be a GPS antenna feed point, connected to the GPS antenna matching circuit. A grounding point (GND1) can be provided between these two feed points. This grounding point is grounded to isolate the diversity antenna and the GPS antenna. This grounding point (GND1) can be called the first grounding point.

[0040] The matching circuit of the diversity antenna may include a parallel capacitor and a series capacitor to achieve frequency band switching. The low-frequency (e.g., 690MHz-960MHz) signal of the diversity antenna can be generated in left-handed mode, and the mid-to-high frequency (e.g., 1700MHz-2700MHz) signal can be generated in 1 / 4 wavelength mode from the first feed point (feed 1) to the first open end of the radiator. Additionally, by adjusting the resonant frequency using adjustable devices in the matching circuit, the 3 / 4 wavelength mode from the first ground point (GND1) to the first open end of the radiator can also generate a signal near 2.7GHz, which can supplement the LTE B7 resonance in carrier aggregation (CA) mode. The LTE B7 frequency band ranges as follows: uplink 2500-2570MHz, downlink 2620-2690MHz.

[0041] The signal in the radiating frequency band of the GPS antenna (around 1575MHz) can be generated by the 1 / 4 wavelength mode of the radiator from the second feed point (feed 2) to the second open end. Furthermore, the third harmonic of the GPS frequency band is the 5GHz band; therefore, the radiator from the second feed point (feed 2) to the second open end can simultaneously radiate signals in both the GPS frequency band and the 5GHz frequency band.

[0042] It is understandable that when the flexible screen 11 is in the folded state, the antenna performance of the first metal strip set on the frame of the main screen will be reduced due to the obstruction of the secondary screen 11-3, and will be significantly worse than the antenna performance of the first metal strip when the flexible screen 11 is in the unfolded state.

[0043] In order to improve the antenna performance of the first metal strip set on the main screen bezel, this application provides an antenna design that makes full use of the second metal strip set on the sub-screen bezel. Figure 2B A simplified illustration shows the antenna structure consisting of the first and second metal strips. For a description of the first metal strip, please refer to [reference needed]. Figure 2A Related descriptions. For example... Figure 2B As shown, one end of the second metal strip is closed (grounded GND2), and the end near the pivot 13 is open. A filter 1 can be installed on the second metal strip near the open end. The operating frequency band of the filter 1 can include the radiation band of the diversity antenna and the radiation band of the GPS antenna; that is, the filter 1 can be a dual-band filter capable of operating simultaneously in the low-frequency band and the GPS band. In specific implementations, the filter 1 can be a high-order filter, such as a third-order filter. When the flexible screen 11 is in a folded state, the first metal strip can couple with the second metal strip to generate radiation in the low-frequency band and the GPS band, which can improve the antenna performance of the first metal strip in the low-frequency band and the GPS band. At this time, the second metal strip can act as a parasitic structure of the first metal strip.

[0044] Understandably, due to the presence of the pivot 13, the side of the first metal strip closest to the pivot is relatively enclosed compared to the other side. To improve the antenna performance of the side of the first metal strip closest to the pivot, for example, to improve the antenna performance of that side in the GPS frequency band, such as... Figure 2C As shown, a filter 2 can also be placed on the side of the first metal strip near the first open end. Filter 2 can present a bandpass to ground in the GPS frequency band. The introduction of filter 2 can create a boundary condition: the radiator between the first ground point (GND1) and filter 2 is closed at both ends, with both ends being points of strong current. The 1 / 4 wavelength mode of the radiator between filter 2 and the first open end can also generate resonance in the GPS frequency band. In this way, the resonance in the GPS frequency band can be supplemented to improve the radiation performance of the GPS antenna. Moreover, by setting filter 2, the isolation between the diversity antenna and the GPS antenna can be further improved, and the resonance of the GPS antenna can be made unaffected when the diversity state of the diversity antenna changes.

[0045] like Figure 2D As shown, a filter 1 can be installed on the second metal strip near the open end, while a filter 2 can be installed on the first metal strip near the first open end. This significantly improves the antenna performance of the first metal strip on the main screen bezel 12-1, avoiding obstruction by the secondary screen 11-3 and the hinge 13. Furthermore, it improves the isolation between the diversity antenna and the GPS antenna on the first metal strip, preventing changes in diversity state from affecting GPS resonance.

[0046] In this application, the antenna fed by the first feed point (feed 1) can be referred to as the first antenna. It is not limited to a diversity antenna; the first antenna may also include other antennas, such as a 2.4GHz Wi-Fi antenna. In this application, the antenna fed by the second feed point (feed 2) can be referred to as the second antenna. It is not limited to a GPS antenna; the second feed point (feed 2) may also be connected to the matching circuit of other antennas, such as LTE B3 or LTE B5 antennas.

[0047] Secondly, combining Figures 3A-3C This application provides an overview of the antenna structure architecture in electronic devices.

[0048] like Figures 3A-3C As shown, the first metal strip can be metal strip 13-1, and the second metal strip can be metal strip 13-3. Wherein, Figure 3A The antenna structure formed by metal strips 13-1 and 13-3 when the flexible screen 11 is in the deployed state is shown. Figures 3B-3C The antenna structure formed by metal strips 13-1 and 13-3 when the flexible screen 11 is in a folded state is shown.

[0049] The metal strip 13-1 can be positioned on the main screen bezel 12-1 near one end of the hinge 13. For ease of reference later, this end of the hinge 13 can be referred to as the first end of the hinge 13. The metal strip 13-1 can be implemented in several ways:

[0050] Method 1: The main screen bezel 12-1 can be a metal bezel. In this case, the main screen bezel 12-1 has a metallic appearance, and the metal strip 13-1 can be formed by this metal bezel. Specifically, two gaps can be made in this metal bezel, for example, a first gap near position a and a second gap near position b. The section of the metal bezel between these two gaps can serve as the metal strip 13-1. One of the gaps (e.g., Figure 3A The central gap 1) can be located near the first end of the pivot 13. Here, "near" means that the distance between the gap (such as gap 1) and the pivot 13 is less than a first preset distance (such as 2 mm).

[0051] Method 2: The main screen bezel 12-1 may include a first bezel portion (e.g., the main screen bezel portion between position a and position b) and a second bezel portion (e.g., the main screen bezel portion between position b and position c or position b and position d). The first bezel portion is metal (metal appearance), and the second bezel portion is non-metallic (non-metallic appearance). One end of the first bezel portion is connected to the first end of the pivot 13, and the other end of the first bezel portion is connected to the second bezel portion; this other end is open. A gap may be provided on the first bezel portion near the first end of the pivot 13. Here, this gap can be referred to as a third gap, which can be the aforementioned first gap. Here, "near" means that the distance between the gap (e.g., gap 1) and the pivot 13 is less than a first preset distance (e.g., 2 mm). A metal frame at one end between the gap and the other end of the first bezel portion can serve as a metal strip 13-1.

[0052] Method 3: The main screen bezel 12-1 can be a non-metallic bezel (such as a plastic bezel, glass bezel, etc.). In this case, the appearance of the main screen bezel is non-metallic (such as plastic, glass, etc.). The metal strip 13-1 can be a metal strip pasted on the inner surface of the non-metallic bezel, or it can be printed on the inner surface of the non-metallic bezel using conductive silver paste.

[0053] The metal strip 13-3 can be positioned on the secondary screen bezel 12-3 near the first end of the hinge 13. The metal strip 13-3 can be implemented in several ways:

[0054] In Method 1, the secondary screen bezel 12-3 can be a metal bezel, giving it a metallic appearance. The metal strip 13-3 can be constructed from this metal bezel. Specifically, a second grounding point (GND2) can be provided on this metal bezel, and a gap (gap 2) can be made on the metal bezel near the first end of the pivot 13. Here, "near" means that the distance between the gap (e.g., gap 2) and the pivot 13 is less than a second preset distance (e.g., 2 mm). The section of the metal bezel between this gap (gap 2) and the second grounding point (GND2) can serve as the metal strip 13-3. This gap can be referred to as the fourth gap.

[0055] Method 2: The secondary screen bezel 12-3 can be a non-metallic bezel (such as a plastic bezel, glass bezel, etc.), in which case the secondary screen bezel 12-3 will have a non-metallic appearance. The metal strip 13-3 can be a metal strip pasted to the inner surface of the non-metallic bezel, or it can be printed on the inner surface of the non-metallic bezel using conductive silver paste.

[0056] like Figures 3A-3CAs shown, metal strip 13-1 may have two feed points: feed 1 and feed 2. Feed 1 can be a diversity antenna feed point, and feed 2 can be a GPS antenna feed point. A ground point (GND1) may be provided between these two feed points. A filter 1 may be provided on metal strip 13-3 near the open end (slot 2). Figures 3A-3B (Not shown in the image) to improve the antenna performance of the metal strip 13-1 and alleviate the problem of obstruction by the sub-screen 11-3. A filter 2 can be installed on the side of the metal strip 13-1 away from the rotating shaft 13. Figures 3A-3B (Not shown in the image) to further improve the antenna performance of the side of the metal strip 13-1 near the pivot 13, and to alleviate the problem of being blocked by the pivot 13. See details in [reference needed]. Figures 2A-2D The relevant content will not be repeated here.

[0057] The length of metal strip 13-1 can be greater than, equal to, or less than the length of metal strip 13-3. When the length of metal strip 13-1 is greater than the length of metal strip 13-3, the antenna performance on the side of metal strip 13-1 away from the pivot 13 is better. This is because, when the flexible screen is in a folded state, the open conditions on the side of metal strip 13-1 away from the pivot 13 are good.

[0058] The antenna structures provided by several embodiments of this application will be described in detail below.

[0059] Example 1

[0060] Figures 4A-4C An antenna structure provided in Embodiment 1 is illustrated as an example. Figure 4A The antenna structure formed when the flexible screen 11 is in the deployed state is shown. Figures 4B-4C The antenna structure formed when the flexible screen 11 is in a folded state is shown. Figures 4A-4C As shown, the antenna structure may include a metal strip 13-1 disposed on the main screen frame 12-1 and a metal strip 13-3 disposed on the secondary screen frame 12-3. The size of the electronic device on which the antenna structure provided in this embodiment is based can be 160 (mm) x 75 (mm) x 10.5 (mm). Here, 160 (mm) refers to the width of the flexible screen 11 when it is in the unfolded state, such as... Figure 4A The length of the flexible screen 11, W. 75 (mm), is as follows: Figure 4A In this context, L = 10.5 (mm) refers to the thickness of the flexible screen 11 when it is in a folded state. Figure 4C In the H section, the length of the metal strip 13-1 on the main screen bezel 12-1 can be approximately 58.5mm, and the length of the metal strip 13-3 on the secondary screen bezel 12-3 can be approximately 43mm. The non-overlapping width between the main screen 11-1 and the secondary screen 11-3 when the flexible screen 11 is in the unfolded state can be 15mm.

[0061] The two ends of the metal strip 13-1 can be open, including a first open end 31-7 and a second open end 31-8. Compared to the first open end 31-7, the second open end 31-8 is closer to the first end 33 of the hinge 13. When the main screen bezel 12-1 is a metal bezel, the second open end 31-8 of the metal strip 13-1 can be achieved by creating a gap 31-5 near the first end 33 of the hinge 13.

[0062] The metal strip 13-1 may have two feed points: a first feed point 31-1 and a second feed point 31-2. The first feed point 31-1 can be connected to the matching circuit of the diversity antenna. The second feed point 31-2 can be connected to the matching circuit of the GPS antenna. A first ground point 31-3 (GND1) may be provided between these two feed points to isolate the diversity antenna and the GPS antenna.

[0063] One end 32-3 of the metal strip 13-3 near the pivot 13 is open, and the other end 32-1 of the metal strip 13-3 is grounded (GND2). When the sub-screen bezel 12-3 is a metal bezel, the open end 32-5 of the metal strip 13-3 can be achieved by opening a gap 32-2 at the first end 33 near the pivot 13.

[0064] A first filter 32-4 may be disposed on the metal strip 13-3 near the open end 32-5. Here, "near" means that the distance between the first connection point 32-3 of the first filter 32-4 and the open end 32-5 is less than a third preset distance value. The operating frequency band of the first filter 32-4 may include the radiation frequency band of the diversity antenna and the radiation frequency band of the GPS antenna, such as the low-frequency band and the GPS band. The first filter 32-4 may be a dual-frequency filter capable of operating in the low-frequency band and the GPS band. When the flexible screen 11 is in a folded state (e.g. Figure 4B When (as shown), metal strip 13-1 can couple with metal strip 13-3 to generate radiation in the radiation bands of the diversity antenna and the GPS antenna (i.e., the low-frequency band and the GPS band), which can improve the obstruction problem of the sub-screen 11-3 and improve the antenna performance of metal strip 13-1. At this time, metal strip 13-3 can be used as a parasitic structure of metal strip 13-1.

[0065] Figures 5A-5B The efficiency simulation curves of the antenna structure provided in this embodiment (with the first filter 32-4 added separately) are shown when the flexible screen is in a folded state. Figure 5AThe radiation efficiency of the antenna structure with and without the first filter 32-4 in the low-frequency band (0.7GHz-0.96GHz) was compared when the flexible screen was in the folded state. It can be seen that when the flexible screen is in the folded state, the antenna radiation efficiency in the low-frequency band is improved by approximately 1.5dB due to the first filter 32-4 being placed on the metal strip 13-3 of the sub-screen 11-3. Among these improvements, Figure 5B The radiation efficiency of the antenna structure with and without the first filter 32-4 in the GPS band (1.55GHz-1.65GHz) was compared when the flexible screen was in the folded state. It can be seen that when the flexible screen is in the folded state, the antenna radiation efficiency in the GPS band is improved by about 0.5dB due to the first filter 32-4 being set on the metal strip 13-3 on the sub-screen 11-3.

[0066] Additionally, a second filter 31-6 can be installed on the metal strip 13-1 near the first open end 31-7. Specifically, the second filter 31-6 can be located at the first feed point 31-1 (feed 1). That is, the second connection point 31-4 of the second filter 31-6 coincides with the first feed point 31-1. The second filter 31-6 can present a bandpass to ground in the radiation frequency band of the GPS antenna. The quarter-wavelength mode of the radiator between position 31-4 and the first open end 31-7 can also generate resonance in the GPS frequency band. In this way, the resonance in the radiation frequency band of the GPS antenna can be supplemented to improve the radiation performance of the GPS antenna. Figure 6 The simulation curves of the antenna structure provided in this embodiment (with the addition of a second filter 31-6) are shown when the flexible screen is in a folded state. It can be seen that when the flexible screen is in a folded state, the antenna radiation efficiency in the GPS band is improved by more than 0.5 dB due to the second filter 31-6 placed on the metal strip 13-1 of the main screen 11-1. By introducing the second filter 31-6, the isolation between the diversity antenna and the GPS antenna can be further improved, and the resonance of the GPS antenna can be kept unaffected when the diversity state of the diversity antenna changes.

[0067] In Embodiment 1, the second filter 31-6 can be included in the matching circuit of the diversity antenna. In this case, the second connection point 31-4 of the second filter 31-6 and the first feed point 31-1 can coincide. The matching circuit and the feed source can be placed on the PCB. Through structural design (such as metal springs), the metal strip 13-1 can be connected to the matching circuit and the feed source on the PCB. In addition to the second filter 31-6, the matching circuit of the diversity antenna can also include a parallel variable capacitor and a series variable capacitor for frequency tuning.

[0068] Example 2

[0069] Figures 7A-7BAn exemplary antenna structure provided in Embodiment 2 is illustrated. Unlike the antenna structure provided in Embodiment 1, the first filter 32-4 can be positioned on the near-ground side of the metal strip 13-3. Specifically, the distance between the connection point 32-3 of the first filter 32-4 and the second grounding point 32-1 is less than a fourth preset distance. In this case, the distance between the connection point 32-3 of the first filter 32-4 and the second grounding point 32-1 is closer than the distance between the connection point 32-3 of the first filter 32-4 and the open end 32-5 (or the slot 32-2). In other words, the position of the first filter 32-4 on the metal strip 13-3 can have multiple options, and this application does not limit this.

[0070] Example 3

[0071] Figures 8A-8B An antenna structure provided in Embodiment 3 is illustrated. Unlike the antenna structure provided in Embodiment 1, the second filter 31-6 can be located at other locations between the first feed point 31-1 (feed 1) and the first ground point 31-3, and is not limited to the first feed point 31-1 (feed 1).

[0072] In embodiments one to three above, the first antenna (such as a diversity antenna) may include a first feed point 31-1 (feed 1), a matching circuit connected to the first feed point 31-1 (feed 1), and the following radiators: a radiator from the first ground point 31-3 to the first open end 31-7, and a radiator from the first feed point 31-1 (feed 1) to the first open end 31-7. The 1 / 4 wavelength mode of the radiator from the first ground point 31-3 to the first open end 31-7 can generate low-frequency resonance, the 1 / 4 wavelength mode of the radiator from the first feed point 31-1 (feed 1) to the first open end 31-7 can generate mid-to-high frequency resonance, and the 3 / 4 wavelength mode of the radiator from the first ground point 31-3 to the first open end 31-7 can also generate resonance near 2.7 GHz, which can supplement the CA-mode LTEB7 resonance.

[0073] In embodiments one to three above, the second antenna (such as a GPS antenna) may include a second feed point 31-2 (feed 2), a matching circuit connected to the second feed point 31-2 (feed 2), and the following radiators: a radiator from the first ground point 31-3 to the second open end 31-8, and a radiator from the second filter 31-4 (filter 2) to the second open end 31-8. Specifically, the 1 / 4 wavelength mode of the radiator from the first ground point 31-3 to the second open end 31-8 can generate resonance in the GPS band, the 3 / 4 wavelength mode of the radiator from the first ground point 31-3 to the second open end 31-8 can generate resonance in the 5GHz band, and the radiator from the second filter 31-4 (filter 2) to the second open end 31-8 can generate resonance around 1.65GHz. Furthermore, when the second antenna is designed in an electronic device as follows... Figure 4A As shown, the connection point of the pivot 13 connecting the main screen frame 12-1 to the radiator of the gap 31-5 can also generate resonance in the 6GHz frequency band.

[0074] Not limited to the antenna structures provided in Embodiments 1 to 3, other embodiments may provide antenna structures where the second filter 31-6 is only provided on the first metal strip 31-1, or the first filter 32-4 is only provided on the second metal strip 31-3. Instead, neither the second filter 31-6 nor the first filter 32-4 is provided on the first metal strip 31-1. This allows for improvements to the antenna performance of the first metal strip 31-1 from different perspectives. For details, please refer to... Figure 2B , Figure 2C Related descriptions.

[0075] Example 4

[0076] Figures 9A-9B An antenna structure provided in Embodiment 4 is illustrated as an example. Figure 9A A simplified schematic diagram of the antenna structure is shown. Figure 9B The antenna structure is illustrated in the architecture of an electronic device. Figure 9B The architecture of the antenna structure provided in the foregoing embodiments in an electronic device is also illustrated. It is not limited to... Figure 9B As shown, the antenna structure provided in Embodiment 4 can also be used independently in electronic devices.

[0077] like Figures 9A-9BAs shown, the antenna structure may include a third metal strip 51-1 and a fourth metal strip 51-3. The third metal strip 51-1 is open at both ends and has a slot 55-1. A third connection point 57 and a third grounding point 56-1 are located on one side of the slot 55-1, and a third feed point 53 and a fourth grounding point 56-2 are located on the other side of the slot 55-1. The third connection point 57 is connected to a third filter. The fourth metal strip 51-3 is open at both ends and has a slot 55-5. A fifth grounding point 56-3 is located on one side of the slot 55-5, and a sixth grounding point 56-4 and a seventh grounding point 56-5 are located on the other side of the slot 55-5.

[0078] The third metal strip 51-1 can be set on the main screen bezel 12-1 near the other end of the hinge 13 (which can be called the second end 35). The fourth metal strip 51-3 can be set on the secondary screen bezel 12-3 near the second end 35 of the hinge 13.

[0079] By feeding at the third feed point 53, the third metal strip 51-1 can generate resonances of 1710-2700MHz and 3300-5000MHz. Specifically, the 1 / 4 wavelength mode of the radiator from slot 55-1 to the fourth ground point 56-2 (GND6) can generate resonances of 1700-2200MHz, the 1 / 4 wavelength mode of the radiator from slot 55-1 to the third ground point 56-1 (GND5) can generate resonances of 2300-2700MHz, the 1 / 4 wavelength mode of the radiator from slot 55-1 to the third connection point 57 (connecting filter 3) can generate resonances of 3300-4200MHz, and the 3 / 4 wavelength mode of the radiator from slot 55-1 to the fourth ground point 56-2 (GND6) can generate resonances of 4200-5000MHz. When the flexible screen 11 is in a folded state, the third metal strip 51-1 can couple with the fourth metal strip 51-3 to excite the following three resonant modes: (1) the LOOP resonant mode of the radiator from the sixth ground point 56-4 (GND8) to the seventh ground point 56-5 (GND9) can generate a resonance around 3300MHz; (2) the 1 / 4 wavelength resonant mode of the radiator from the slot 55-5 to the sixth ground point 56-4 (GND8) can generate a resonance around 5000MHz; (3) the 1 / 4 wavelength resonant mode of the radiator from the slot 55-5 to the fifth ground point 56-3 (GND7) can generate a resonance around 2700MHz or a resonance around 5000MHz. The antenna performance of the third metal strip 51-1 when the flexible screen 11 is in a folded state can be improved through the above three resonant modes.

[0080] Example 5

[0081] Figure 10A An exemplary antenna structure provided in Embodiment 5 is shown. Unlike the antenna structure provided in Embodiment 4, the fifth grounding point 56-3 (GND7) may not be provided on the fourth metal strip 51-3. In this embodiment, when the flexible screen 11 is in a folded state, the third metal strip 51-1 can couple with the fourth metal strip 51-3 to excite the following two resonant modes: (1) the LOOP resonant mode of the radiator from the sixth grounding point 56-4 (GND8) to the seventh grounding point 56-5 (GND9) can generate a resonance around 3300MHz; (2) the 1 / 4 wavelength resonant mode of the radiator from the gap 55-5 to the sixth grounding point 56-4 (GND8) can generate a resonance around 5000MHz.

[0082] Example 6

[0083] Figure 10B An exemplary antenna structure provided in Embodiment Six is ​​shown. Unlike the antenna structure provided in Embodiment Four, the sixth grounding point 56-4 (GND8) may not be provided on the fourth metal strip 51-3. In this embodiment, when the flexible screen 11 is in a folded state, the third metal strip 51-1 can couple with the fourth metal strip 51-3 to excite the following two resonant modes: (1) the 1 / 4 wavelength resonant mode of the radiator from the slot 55-5 to the sixth grounding point 56-4 (GND8) can generate a resonance around 5000MHz; (2) the 1 / 4 wavelength resonant mode of the radiator from the slot 55-5 to the fifth grounding point 56-3 (GND7) can generate a resonance around 2700MHz or a resonance around 5000MHz.

[0084] In this application, the wavelength in a certain wavelength mode of the antenna (such as the half-wavelength mode) can refer to the wavelength of the signal radiated by the antenna. For example, the half-wavelength mode of a suspended metal antenna can generate resonance in the 1.575 GHz frequency band, where the wavelength in the half-wavelength mode refers to the wavelength of the signal radiated by the antenna in the 1.575 GHz frequency band. It should be understood that the wavelength of the radiated signal in air can be calculated as follows: Wavelength = Speed ​​of light / Frequency, where the frequency is the frequency of the radiated signal. The wavelength of the radiated signal in a medium can be calculated as follows: Where ε is the relative permittivity of the medium, and the frequency is the frequency of the radiated signal.

[0085] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An electronic device, comprising: The device comprises a flexible screen, a rotating shaft, a metal frame and an antenna device. The flexible screen comprises a first screen and a second screen arranged on two sides of the rotating shaft respectively, and the flexible screen can be folded at the rotating shaft. The metal frame comprises a metal frame of the first screen and a metal frame of the second screen. The antenna device comprises: a first metal strip comprising a part of the metal frame of the first screen, the first metal strip having a first open end and a second open end, the first metal strip being in a straight strip shape; a first feeding point and a second feeding point arranged on the first metal strip and used as a first antenna and a second antenna; a first grounding point arranged on the first metal strip and between the first feeding point and the second feeding point; and a second metal strip comprising a part of the metal frame of the second screen, the second metal strip having a third open end and a first grounding end, wherein when the flexible screen is folded at the rotating shaft, the positions of the first feeding point, the second feeding point and the first grounding point on the first metal strip are located in an overlapping area of the first metal strip and the second metal strip, and the second metal strip acts as a parasitic antenna in a first radiation frequency range of the first antenna and a second radiation frequency range of the second antenna through coupling with the first metal strip.

2. The electronic device of claim 1, wherein, When the flexible screen is folded at the rotating shaft, the positions of the first feeding point and the second feeding point on the first metal strip overlap the second metal strip between the third open end and the first grounding end.

3. The electronic device of claim 1 or 2, wherein, The second open end is closer to a first end of the rotating shaft than the first open end, and the third open end is closer to the first end of the rotating shaft than the first grounding end.

4. The electronic device of claim 3, wherein, When the flexible screen is folded at the rotating shaft, the second open end is aligned with the third open end.

5. The electronic device of claim 1, wherein, The first feeding point is connected to a matching circuit of the first antenna, and the second feeding point is connected to a matching circuit of the second antenna.

6. The electronic device of claim 1, wherein, The first radiation frequency range of the first antenna overlaps with the second radiation frequency range of the second antenna in a certain frequency range.

7. The electronic device of claim 1, wherein, The first radiation frequency range of the first antenna has the same frequency range as the second radiation frequency range of the second antenna.

8. The electronic device of claim 1, wherein, The coupling between the second metal strip and the first metal strip is used to improve the radiation efficiency of the first metal strip when the flexible screen is in a folded state.

9. The electronic device of claim 1, wherein, A first gap and a second gap are formed in the metal frame of the first screen, and a section of the metal frame between the first gap and the second gap constitutes the first metal strip, the first gap forms the second open end of the first metal strip, and the second gap forms the first open end of the first metal strip.

10. The electronic device of claim 9, wherein, The first gap is formed in the metal frame of the first screen at a position that is less than 2 mm away from the first open end of the rotating shaft.

11. The electronic device of claim 1, wherein, A second grounding point is arranged on the metal frame of the second screen, and a third gap is formed in the metal frame, and a section of the metal frame between the second grounding point and the third gap constitutes the second metal strip, and the third gap forms the third open end of the second metal strip.

12. The electronic device of claim 11, wherein, The third slit is arranged on the metal frame of the second screen, and a distance from the third slit to the first open end of the rotating shaft is less than 2 mm.

13. The electronic device of claim 1, wherein, The metal frame of the second screen is provided with a third slit and a fourth slit, and a second grounding point is arranged between the third slit and the fourth slit, a section of the metal frame between the third slit and the fourth slit forms the second metal strip, and the third slit forms the third open end of the second metal strip.

14. The electronic device of claim 1, wherein, The length of the first metal strip is greater than or equal to the length of the second metal strip.

15. The electronic device of claim 1, wherein, The first metal strip is provided with a first connecting point, and the first connecting point is connected with a first filter.

16. The electronic device of claim 15, wherein, The working frequency band of the first filter includes the first radiation frequency band of the first antenna and the second radiation frequency band of the second antenna.

17. The electronic device of claim 1, wherein, The first metal strip is provided with a second connecting point, and the second connecting point is connected with a second filter.

18. The electronic device of claim 17, wherein, The second connecting point connected with the second filter coincides with the first feeding point.

19. The electronic device of claim 17 or 18, wherein, The second filter is included in a matching circuit of the first antenna.

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