Antenna device and electronic equipment

Abstract

The embodiments of the present application provide an antenna device and an electronic device, in which a main screen antenna and a secondary screen antenna are respectively designed in the main screen part and the secondary screen part of the electronic device, wherein the main screen antenna and the secondary screen antenna can be antennas of the same frequency band, and when the folding screen is in the folded state, the positions of the main and secondary screen antennas will overlap. The main screen antenna and the secondary screen antenna can excite two antenna modes with high isolation. In this way, even if the main screen antenna and the secondary screen antenna are of the same frequency and overlap, good isolation can be obtained, and the radiation patterns are complementary, which is particularly beneficial for the MIMO antenna design of electronic devices with folding screens. Moreover, it is not necessary to isolate multiple antennas of the same frequency band in physical positions. For example, two or more antennas of the same frequency with high isolation can be obtained without staggering the design in physical positions, thereby making full use of the antenna design space of electronic devices with folding screens.

Description

Technical Field

[0001] The present invention relates to the field of antenna technology, and in particular to an antenna device and an electronic device. Background Art

[0002] With the development of mobile communication technology and the popularity of smart phones, the design of smart phones has evolved from large screens, full screens, and rollable screens to foldable screens for better user experience, novel appearance and functions. Foldable screens of electronic devices such as smart phones have brought new possibilities to the functional design of electronic devices, and can be applied to and cover more new application scenarios. At the same time, foldable screens have also brought new challenges and new possibilities to the antenna design of electronic devices. Summary of the invention

[0003] An embodiment of the present invention provides an antenna device, which can obtain a main screen antenna and a sub-screen antenna with complementary performance and high isolation at the overlapping position of the main screen part and the sub-screen part when an electronic device such as a mobile phone is in a folded state, and the antenna design has high space utilization.

[0004] In a first aspect, the present application provides an electronic device, which may include: a first device body, a second device body and a hinge, wherein the first device body and the second device body are connected by the hinge, and the electronic device can be folded at the hinge.

[0005] The electronic device may further include: a first antenna disposed on the first device body and a second antenna disposed on the second device body, wherein the first antenna and the second antenna at least partially overlap when the electronic device is in a folded state.

[0006] The first antenna may include a first strip conductor and a first feeding point disposed on the first conductor, the first conductor is open at both ends, and the first feeding point is connected to a feed source. The distance from the first feeding point to the middle position of the first conductor may be greater than or equal to zero and less than 1 / 16 of the operating wavelength of the first antenna, or the distance from the first feeding point to the open end of the first conductor may be greater than or equal to zero and less than 1 / 16 of the operating wavelength of the first antenna.

[0007] The second antenna may include a strip-shaped second conductor, a second feeding point and a grounding branch arranged on the second conductor, the second conductor is open at both ends, the second feeding point is connected to a feed source, and the grounding branch connects the second conductor to the ground at a middle position of the second conductor. The distance from the second feeding point to the connection point between the second conductor and the grounding branch is greater than zero and less than 1 / 8 of the operating wavelength of the second antenna, or the distance from the second feeding point to the open end of the second conductor is greater than or equal to zero and less than 1 / 8 of the operating wavelength of the second antenna.

[0008] Among them, at least partial overlap may include: the projection of the first antenna and the second antenna on the plane where the first device body is located, or the projection on the plane where the second device body is located, partially overlap or completely overlap. It can also be said that when the electronic device is in a folded state, the projection of the first antenna on the plane of the second device body partially overlaps or completely overlaps with the second antenna, or when the electronic device is in a folded state, the projection of the second antenna on the plane of the first device body partially overlaps or completely overlaps with the first antenna. The overlap does not include the overlap caused by the intersection of the projection and the antenna (for example, vertical), but mainly refers to the overlap caused by the first conductor and the second conductor being parallel or on a straight line.

[0009] The connection point between the second conductor and the ground branch may refer to any point in the connection area (also referred to as the connection point) between the ground branch and the second conductor, such as the center point. The first and second feeding points may refer to any point in the connection area (also referred to as the connection point) between the feed line and the conductor, such as the center point.

[0010] In the electronic device provided in the first aspect, the first conductor of the first antenna can present a current distributed in the same direction, which stimulates Figure 4A-4B In the DM mode of the wire antenna shown, the polarization direction can be substantially perpendicular to the extension direction of the first conductor. The second conductor of the secondary screen antenna can present a symmetrically reversely distributed current, which excites Figure 3A-3B In the CM mode of the wire antenna shown, the polarization direction can be basically the same as the extension direction of the second conductor. In this way, the polarization directions of the first antenna and the second antenna are orthogonal, and the isolation is high. Even if the first antenna and the second antenna are at the same frequency, good isolation can be obtained, and the radiation patterns are complementary, which is particularly beneficial to the MIMO antenna design of electronic devices with foldable screens.

[0011] In the first aspect, the first device body and the second device body can be Figure 1A-Figure 1C The main screen part 11-1 and the sub-screen part 11-3 are shown in FIG. The first and second antennas can be Fig. 7A For example, the first conductor may be conductor 21-A, the first feeding point may be feeding point 23, the second conductor may be conductor 21-B, the second feeding point may be feeding point 24, and the grounding branch may be grounding branch 25. The first and second antennas may also be Figure 8A-8B The secondary and main screen antennas shown in the figure, for example, the first conductor can be a virtual floating metal frame 41-B, the first feeding point can be a feeding point 33-B, the second conductor can be a virtual floating metal edge 41-A, the second feeding point can be a feeding point 33-A, and the grounding branch can be a grounding branch 32.

[0012] In the first aspect, the electronic device may further include: a frame of the first device body and a PCB floor of the first device body. The first antenna may be implemented in the electronic device as follows: the first conductor may be a strip conductor arranged on the frame of the first device body, and the first conductor may be separated from the PCB floor of the first device body by a first groove (clearance), and the first groove (e.g. Fig. 8A The slot 31-B) is formed by hollowing out the PCB floor of the first device body, and the first slot can be adjacent to the first conductor.

[0013] The frame of the first screen may be a metal frame, and the first conductor may be a section of a metal frame with two open ends formed by opening a gap on the metal frame. The first conductor is not grounded. The length of the first slot is greater than the length of the section of the metal frame (e.g., the suspended metal frame 41-A), that is, along the extension direction of the metal frame, the gaps at both ends of the section of the metal frame, such as the two gaps 35-A and 35-B, are crossed to form a slot that is longer than the section of the metal frame, so that the section of the metal frame forms a suspended metal frame with two open ends, thereby forming a linear antenna radiator.

[0014] The frame of the first screen may also be a non-metal frame, and in this case the first conductor is a strip conductor printed or pasted on the inner side of the metal frame.

[0015] In the first aspect, the electronic device may further include: a frame of the second device body and a PCB floor of the second device body. The second conductor may be a strip conductor arranged on the frame of the second device body, and the second conductor and the PCB floor of the second device body may be separated by a second groove (clearance) and connected by a grounding branch. The second groove (e.g. Fig. 8A The slot 31-A) in the second device body may be formed by hollowing out the PCB floor of the second device body, and the second slot may be adjacent to the second conductor.

[0016] The frame of the second screen may be a metal frame, and the second conductor may be a suspended metal frame formed by opening a gap in the metal frame. The frame of the second screen may be a non-metal frame, and the second conductor may be a strip conductor printed or pasted on the inner side of the metal frame.

[0017] In the first aspect, the grounding branch of the second antenna can be a strip-shaped floor portion connected to the second conductor formed by hollowing out the PCB floor of the second device body, or it can be a metal spring connected to the second conductor and arranged on the PCB floor of the second device body, or it can be a conductive branch extending from the second conductor and connected to the PCB floor.

[0018] The folding screen antenna provided in the first aspect can be further deformed. That is, the second antenna can be transformed from a CM wire antenna to an inverted F antenna (IFA), operating in a 1 / 4 wavelength mode. The second antenna transformed into an IFA may include a strip-shaped second conductor and a second feeding point and a grounding branch arranged on the second conductor, the grounding branch connecting the second conductor to the ground at one end of the second conductor, and the second feeding point connecting the feed source. The distance from the second feeding point to the connection point between the second conductor and the grounding branch may be greater than zero and less than 1 / 8 of the operating wavelength of the second antenna, or the distance from the second feeding point to the open end of the second conductor may be greater than or equal to zero and less than 1 / 8 of the operating wavelength of the second antenna. Among them, the specific implementation of the second conductor and the grounding branch can refer to the previous content, which will not be repeated here.

[0019] In a second aspect, the present application provides an electronic device, which may include: the electronic device may include: a first device body, a second device body and a hinge, the first device body and the second device body are connected by the hinge, and the electronic device can be folded at the hinge.

[0020] The electronic device may further include: a first antenna disposed on the first device body and a second antenna disposed on the second device body, the first antenna and the second antenna at least partially overlapping when the electronic device is in a folded state, wherein:

[0021] The first antenna may include a first strip conductor and a first feeding point disposed on the first conductor, the first conductor is open at both ends, and the first feeding point is connected to a feed source. The distance from the first feeding point to the middle position of the first conductor may be greater than or equal to zero and less than 1 / 16 of the operating wavelength of the first antenna, or the distance from the first feeding point to the open end of the first conductor may be greater than or equal to zero and less than 1 / 16 of the operating wavelength of the first antenna.

[0022] The second antenna may include a second conductor with a first slot, both ends of the first slot are closed and grounded, a first slot is provided on a first side of the first slot, a distance from the first slot to the middle position of the first side may be less than 1 / 16 of the working wavelength of the second antenna, a second feeding point is provided on the first side of the first slot, the second feeding point is connected to a feed source, and a distance from the second feeding point to the first slot may be greater than zero and less than 1 / 8 of the working wavelength of the second antenna.

[0023] Among them, at least partial overlap may include: the projection of the first antenna and the second antenna on the plane where the first device body is located, or the projection on the plane where the second device body is located, partially overlap or completely overlap. It can also be said that when the electronic device is in a folded state, the projection of the first antenna on the plane of the second device body partially overlaps or completely overlaps with the second antenna, or when the electronic device is in a folded state, the projection of the second antenna on the plane of the first device body partially overlaps or completely overlaps with the first antenna. The overlap does not include the overlap caused by the intersection of the projection and the antenna (for example, vertical), but mainly refers to the overlap caused by the first conductor and the second conductor being parallel or on a straight line.

[0024] Among them, the first and second feeding points may refer to any point in the connection area (also referred to as the connection point) between the feed line and the conductor, such as the center point. The distance from the first gap to the middle position of the first side may refer to the distance from the midpoint of the first gap to the midpoint of the first side, or may refer to the distance from the two ends of the first gap to the midpoint of the first side. The distance from the second feeding point to the first gap may refer to the distance from the second feeding point to the midpoint of the first gap, or may refer to the distance from the second feeding point to the two ends of the first gap.

[0025] In the electronic device provided in the second aspect, the first conductor of the first antenna can present a current distributed in the same direction, which stimulates Figure 4A-4B In the DM mode of the linear antenna shown, the polarization direction can be substantially perpendicular to the extension direction of the first conductor. The slot of the second conductor of the secondary screen antenna can present a symmetrically reversely distributed electric field, which excites Figure 5A-Figure 5B In the slot antenna CM mode shown, the polarization direction can be basically the same as the extension direction of the slot. In this way, the polarization directions of the first antenna and the second antenna are orthogonal, and the isolation is high. Even if the first antenna and the second antenna are at the same frequency, good isolation can be obtained, and the radiation patterns are complementary, which is particularly beneficial to the MIMO antenna design of electronic devices with folding screens.

[0026] In the second aspect, the first device body and the second device body can be Figure 1A-Figure 1C The main screen part 11-1 and the sub-screen part 11-3 are shown in FIG. The first and second antennas can be Figure 7B For example, the first conductor may be conductor 21-A, the first feeding point may be feeding point 23, the second conductor may be conductor 21-C, the first slot may be slot 26, the second feeding point may be feeding point 27, and the first slot may be slot 28. The first and second antennas may also be Figure 11A-11BThe secondary and main screen antennas shown in the figure, for example, the first conductor may be a floating metal frame 61-B, the first feeding point may be a feeding point 63-B, the second conductor may be a PCB floor and a metal frame conductor of the main screen part that encloses the slot 62-A, the first slot may be the slot 62-A, the second feeding point may be the feeding point 63-A, and the first gap may be the gap 67.

[0027] In the second aspect, the electronic device may further include: a frame of the first device body and a PCB floor of the first device body. The first conductor may be a strip conductor arranged on the frame of the first device body, and the first conductor and the PCB floor of the first device body may be separated by a second groove (clearance), and the second groove (e.g. Fig.11A The slot 62-B) in can be formed by hollowing out the PCB floor of the first device body, and the second slot is adjacent to the first conductor.

[0028] The frame of the first screen may be a metal frame, and the first conductor may be a metal frame with two open ends formed by opening a gap in the metal frame. The first conductor is not grounded. The length of the second slot is greater than the length of the metal frame (e.g. Fig.11A The length of the suspended metal frame 61-B) in the middle, that is, along the extension direction of the metal frame, crosses the gaps at both ends of this section of the metal frame, such as the two gaps 66-A and 66-B, and forms a groove that is longer than this section of the metal frame, so that this section of the metal frame forms a suspended metal frame with both ends open, thereby forming a linear antenna radiator.

[0029] The frame of the first screen may also be a non-metal frame, and in this case the first conductor is a strip conductor printed or pasted on the inner side of the metal frame.

[0030] In the second aspect, the electronic device may further include: a metal frame of the second device body and a PCB floor of the second device body. The second conductor may be formed by enclosing the first groove (for example Fig.11A The first slot may be formed by hollowing out the PCB floor of the second device body, the first slot may be adjacent to the metal frame of the second device body, and the first gap may be a gap opened on the metal frame of the second device body adjacent to the first slot and forming the first side of the first slot. On the metal frame, the first gap is specifically opened on one side of the second feeding point, and no gap is opened on the other side of the second feeding point.

[0031] In a third aspect, the present application provides an electronic device, which may include: a first device body, a second device body and a hinge, the first device body and the second device body are connected by the hinge, and the electronic device can be folded at the hinge.

[0032] The electronic device may further include: a first antenna disposed on the first device body and a second antenna disposed on the second device body, the first antenna and the second antenna at least partially overlapping when the electronic device is in a folded state, wherein:

[0033] The first antenna may include a first strip conductor, a first feeding point and a grounding branch arranged on the first conductor, the first conductor is open at both ends, and the first feeding point is connected to a feed source. The grounding branch connects the first conductor to the ground at the middle position of the first conductor, and the distance from the first feeding point to the connection point between the first conductor and the grounding branch may be greater than zero and less than 1 / 8 of the working wavelength of the first antenna, or the distance from the first feeding point to the open end of the first conductor may be greater than or equal to zero and less than 1 / 8 of the working wavelength of the first antenna.

[0034] The second antenna may include a second conductor with a first slot, both ends of the first slot are closed and grounded, a second feeding point is provided on a first side of the first slot, and the second feeding point is connected to a feed source. A distance from the second feeding point to a middle position of the first side of the first slot may be greater than or equal to zero and less than 1 / 16 of an operating wavelength of the second antenna.

[0035] Among them, at least partial overlap may include: the projection of the first antenna and the second antenna on the plane where the first device body is located, or the projection on the plane where the second device body is located, partially overlap or completely overlap. It can also be said that when the electronic device is in a folded state, the projection of the first antenna on the plane of the second device body partially overlaps or completely overlaps with the second antenna, or when the electronic device is in a folded state, the projection of the second antenna on the plane of the first device body partially overlaps or completely overlaps with the first antenna. The overlap does not include the overlap caused by the intersection of the projection and the antenna (for example, vertical), but mainly refers to the overlap caused by the first conductor and the second conductor being parallel or on a straight line.

[0036] The connection point between the first conductor and the grounding branch may refer to any point in the connection area (also referred to as the connection point) between the grounding branch and the first conductor, such as a center point. The first and second feeding points may refer to any point in the connection area (also referred to as the connection point) between the feed line and the conductor, such as a center point.

[0037] In the electronic device provided in the third aspect, the first conductor of the first antenna may present a reversely distributed current, which stimulates the Figure 3A-3B In the CM mode of the wire antenna shown, the polarization direction is basically the same as the extension direction of the first conductor. The slots of the second conductor of the auxiliary screen antenna can present an electric field distributed in the same direction, which excites Figure 6A-6BIn the slot antenna DM mode shown, the polarization direction can be basically perpendicular to the extension direction of the slot. In this way, the polarization directions of the first antenna and the second antenna are orthogonal, and the isolation is high. Even if the first antenna and the second antenna are at the same frequency, good isolation can be obtained, and the radiation patterns are complementary, which is particularly beneficial to the MIMO antenna design of electronic devices with folding screens.

[0038] In the third aspect, the first device body and the second device body can be Figure 1A-Figure 1C The main screen part 11-1 and the sub-screen part 11-3 are shown in FIG. The first and second antennas can be Figure 7C For example, the first conductor may be conductor 21-B, the first feeding point may be feeding point 24, the second conductor may be conductor 21-D, the first slot may be slot 32, and the second feeding point may be feeding point 31. The first and second antennas may also be Figure 10A-10B The main and auxiliary screen antennas shown in the figure, for example, the first conductor can be a virtual metal frame 51-A, the first feeding point can be a feeding point 53-A, the second conductor can be a PCB floor and a metal frame of the main screen part that encloses the slot 52-B, the first slot can be the slot 52-B, and the second feeding point can be the feeding point 53-B.

[0039] In the third aspect, the electronic device may further include: a frame of the first device body and a PCB floor of the first device body. The first conductor may be a strip conductor arranged on the frame of the first device body, and the first conductor and the PCB floor of the first device body may be separated by a second groove (clearance) and connected by a grounding branch, and the second groove (e.g. Fig. 10A The slot 52-A) in the embodiment may be formed by hollowing out the PCB floor of the first device body, and the second slot may be adjacent to the first conductor.

[0040] The frame of the first screen may be a metal frame, and the first conductor may be a metal frame with two open ends formed by opening a gap in the metal frame. The length of the second slot is greater than that of the metal frame (e.g. Fig. 10A The length of the suspended metal frame 51-A) in the middle, that is, along the extension direction of the metal frame, crosses the gaps at both ends of this section of the metal frame, such as the two gaps 55-A and 55-B, and forms a groove that is longer than this section of the metal frame, so that this section of the metal frame forms a suspended metal frame with both ends open, thereby forming a linear antenna radiator.

[0041] The frame of the first screen may also be a non-metal frame, and in this case the first conductor is a strip conductor printed or pasted on the inner side of the metal frame.

[0042] Among them, the grounding branch of the first antenna can be a strip-shaped floor portion connected to the first conductor formed by hollowing out the PCB floor of the first device body, or the grounding branch can be a metal spring connected to the first conductor and arranged on the PCB floor of the first device body, or the grounding branch can be a conductive branch extending from the first conductor and connected to the PCB floor.

[0043] In the third aspect, the electronic device may further include: a metal frame of the second device body and a PCB floor of the second device body. The second conductor may be formed by enclosing the first groove (for example Fig. 10A The first groove may be formed by hollowing out the PCB floor of the second device body, and the first groove may be adjacent to the metal frame of the second device body. No gap is provided on the metal frame of the second device body adjacent to the first groove and forming the first side of the first groove.

[0044] In a fourth aspect, the present application provides an electronic device, which may include: a first device body, a second device body and a hinge, wherein the first device body and the second device body are connected by the hinge, and the electronic device can be folded at the hinge.

[0045] The electronic device may further include: a first antenna disposed on the first device body and a second antenna disposed on the second device body, the first antenna and the second antenna at least partially overlapping when the electronic device is in a folded state, wherein:

[0046] The first antenna may include a first conductor with a first slot, both ends of the first slot are closed and grounded, a first slot is provided on a first side of the first slot, a distance from the first slot to the middle position of the first side may be less than 1 / 16 of the working wavelength of the second antenna, a first feeding point is provided on the first side of the first slot, the first feeding point is connected to a feed source, and a distance from the first feeding point to the first slot may be greater than zero and less than 1 / 8 of the working wavelength of the first antenna.

[0047] The second antenna may include a second conductor with a second slot, both ends of the second slot are closed and grounded, a second feeding point is provided on a second side of the second slot, and the second feeding point is connected to a feed source. A distance from the second feeding point to a middle position of the second side of the second slot may be greater than or equal to zero and less than 1 / 16 of an operating wavelength of the second antenna.

[0048] Among them, at least partial overlap may include: the projection of the first antenna and the second antenna on the plane where the first device body is located, or the projection on the plane where the second device body is located, partially overlap or completely overlap. It can also be said that when the electronic device is in a folded state, the projection of the first antenna on the plane of the second device body partially overlaps or completely overlaps with the second antenna, or when the electronic device is in a folded state, the projection of the second antenna on the plane of the first device body partially overlaps or completely overlaps with the first antenna. The overlap does not include the overlap caused by the intersection of the projection and the antenna (for example, vertical), but mainly refers to the overlap caused by the first conductor and the second conductor being parallel or on a straight line.

[0049] Among them, the first and second feeding points may refer to any point in the connection area (also referred to as the connection point) between the feed line and the conductor, such as the center point. The distance from the first gap to the middle position of the first side may refer to the distance from the midpoint of the first gap to the midpoint of the first side, or may refer to the distance from the two ends of the first gap to the midpoint of the first side. The distance from the second feeding point to the first gap may refer to the distance from the second feeding point to the midpoint of the first gap, or may refer to the distance from the second feeding point to the two ends of the first gap.

[0050] In the electronic device provided in the fourth aspect, the slot of the first conductor of the first antenna can present an electric field with symmetrical reverse distribution, which can stimulate Figure 5A-Figure 5B In the slot antenna CM mode shown, the polarization direction is basically the same as the extension direction of the slot on the first conductor. The slot on the second conductor of the secondary screen antenna can present an electric field distributed in the same direction, which excites Figure 6A-6B In the slot antenna DM mode shown, the polarization direction can be basically perpendicular to the extension direction of the slot. In this way, the polarization directions of the first antenna and the second antenna are orthogonal, and the isolation is high. Even if the first antenna and the second antenna are at the same frequency, good isolation can be obtained, and the radiation patterns are complementary, which is particularly beneficial to the MIMO antenna design of electronic devices with folding screens.

[0051] In the fourth aspect, the electronic device may further include: a metal frame of the first device body and a PCB floor of the first device body. The first conductor includes a first groove (eg Fig. 12A The first groove is formed by hollowing out the PCB floor of the first device body, and the first groove is adjacent to the metal frame of the first device body. There is no gap on the metal frame of the first device body adjacent to the first groove and forming the first side of the first groove.

[0052] In the fourth aspect, the electronic device may further include: a metal frame of the second device body and a PCB floor of the second device body; the second conductor includes a second groove (eg Fig. 12AThe second slot is formed by hollowing out the PCB floor of the second device body, the second slot is adjacent to the metal frame of the second device body, and the first gap (e.g. Fig. 12A The gap 79 in the figure can be a gap formed on a metal frame of the second device body adjacent to the second slot and forming a first side of the first slot. On the metal frame, the first gap is specifically formed on one side of the second feeding point, and no gap is formed on the other side of the second feeding point. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments of the present application will be described below.

[0054] Figure 1A-Figure 1C is a schematic diagram of the structure of an electronic device provided by an embodiment of the present application;

[0055] Figure 2A-2B It is a schematic diagram of the design position of the main and auxiliary screen antennas provided in this application;

[0056] Figure 3A-3B It is a schematic diagram of the principle of the CM wire antenna provided by this application;

[0057] Figure 4A-4B It is a principle schematic diagram of the DM line antenna provided by this application;

[0058] Figure 5A-Figure 5B It is a schematic diagram of the principle of the CM slot antenna provided in this application;

[0059] Figure 6A-6B It is a principle schematic diagram of the DM slot antenna provided by this application;

[0060] Figure 7A-7D It is a schematic diagram of several main and auxiliary screen antenna design schemes provided in this application;

[0061] Figure 8A-8C yes Fig. 7A A schematic diagram of the implementation of the antenna design solution shown in the electronic device;

[0062] Figure 9A-9D yes Fig. 7A A schematic diagram of a modified implementation of the antenna design solution in an electronic device is shown;

[0063] Fig.9E yes Figure 9A-9D A simulation schematic diagram of the antenna structure shown;

[0064] Fig.9F yes Fig. 7A The schematic diagram of another variant implementation of the antenna design solution shown in the electronic device;

[0065] Figure 9G-9H yes Fig.9F A simulation schematic diagram of the antenna structure shown;

[0066] Figure 10A-10B yes Figure 7B A schematic diagram of the implementation of the antenna design solution shown in the electronic device;

[0067] Figure 11A-11B yes Figure 7C A schematic diagram of the implementation of the antenna design solution shown in the electronic device;

[0068] Figure 12A-12B yes Fig.7D A schematic diagram of the implementation of the antenna design solution shown in the electronic device;

[0069] Figure 13A-13B The feeding positions of the CM line antenna and the DM line antenna provided by the present application are shown;

[0070] Figure 14A-14G The diagram shows example dimensions and related simulation results that can be used when the main and auxiliary screen antennas provided in this application are implemented in several typical frequency bands. DETAILED DESCRIPTION

[0071] The embodiments of the present invention are described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0072] The technical solution provided in this application is applicable to electronic devices that adopt one or more of the following communication technologies: global system for mobile communication (GSM) technology, code division multiple access (CDMA) communication technology, wideband code division multiple access (WCDMA) communication technology, general packet radio service (GPRS), long term evolution (LTE) communication technology, Wi-Fi communication technology, 5G communication technology, millimeter wave (mmWave) communication technology, SUB-6G communication technology and other future communication technologies. The following embodiments do not highlight the needs of the communication network, but only illustrate the working characteristics of the antenna with the frequency band. In this application, the electronic device can be a mobile phone, a tablet computer, a personal digital assistant (PDA) and other electronic devices.

[0073] Figure 1A The electronic device on which the antenna design provided in this application is based is exemplified. Figure 1A As shown, the electronic device may include: a folding screen 11, a hinge 13 and a frame. Among them, the folding screen 11 may include: a main screen part 11-1, and one or more secondary screen parts 11-3. The electronic device can therefore be divided into a device body with a main screen (hereinafter referred to as the main screen part) and a device body with a secondary screen (hereinafter referred to as the secondary screen part). In order to simplify the drawings, only one secondary screen part 11-3 is shown in the drawings. The hinge 13 connects the first device body and the second device body. The width (w1) of the main screen part and the width (w2) of the secondary screen part may be equal or unequal. The frame of the electronic device may include a main screen frame 12-1 and a secondary screen frame 12-3. The main screen frame 12-1 is arranged around the main screen part 11-1, and the secondary screen frame 12-3 is arranged around the secondary screen part 11-3. The frame may be a metal frame or a non-metal frame (such as a plastic frame, a glass frame, etc.).

[0074] like Figure 1B As shown, the electronic device can be bent at the hinge 13. Here, being bent can include the electronic device being bent outward and the electronic device being bent inward. Bending outward means that after being bent, the folding screen 11 is presented on the outside, the back cover of the electronic device is presented on the inside, and the display content in the folding screen 11 is visible to the user. Bending inward means that after being bent, the folding screen 11 hides the inside, the back cover of the electronic device is presented on the outside, and the display content in the folding screen 11 is not visible to the user. The electronic device has two modes: an unfolded (open) state and a folded (folded) state. The unfolded state may refer to a state when the angle α between the main screen and the sub-screen exceeds a first angle (such as 120°), and the angle α may even be equal to or close to 180°. The folded state may refer to a state when the angle α between the main screen and the sub-screen is less than a second angle (such as 15°), and the angle α may even be equal to or close to 0°. Among them, when the folding screen 11 is in the unfolded state, the electronic device can be as follows Figure 1A As shown in the example; when the folding screen 11 is in the folded state, the electronic device can be as Figure 1C As shown in the example.

[0075] The electronic device may also include a printed circuit board (PCB), a housing, etc., which are not shown. Among them, the housing mainly supports the entire machine. A metal layer may be provided on one side of the PCB, and the metal layer may be formed by etching metal on the surface of the PCB. The metal layer may be used for grounding the electronic components carried on the PCB to prevent the user from getting an electric shock or the device from being damaged. The metal layer may be called a PCB floor, including a main screen PCB floor and a secondary screen PCB floor. In addition to the PCB floor, the electronic device may also have other floors for grounding, such as a metal middle frame.

[0076] The present application embodiment provides an antenna design solution, such as Figure 2A As shown, a main screen antenna and a secondary screen antenna are respectively designed in the main screen part and the secondary screen part of the electronic device, such as the main screen antenna Ant1-1 and the secondary screen antenna Ant1-2. Among them, the main screen antenna and the secondary screen antenna can be antennas of the same frequency band, and when the electronic device is in a folded state, the positions of the main and secondary screen antennas will overlap, such as partial overlap or complete overlap. Here, the overlap may refer to the overlap of the projection of the main screen antenna on the plane of the secondary screen part and the secondary screen antenna when the electronic device is in a folded state, or the overlap of the projection of the secondary screen antenna on the plane of the main screen part and the main screen antenna when the electronic device is in a folded state. The overlap does not include the overlap caused by the intersection of the projection and the antenna (for example, vertical), but mainly refers to the overlap caused by the radiators of the main and secondary screen antennas being parallel or in a straight line. The main screen antenna and the secondary screen antenna can excite two high-isolation antenna modes, such as the common-mode antenna mode and the differential-mode antenna mode that will be introduced in subsequent content. For example, the polarization direction of the main screen antenna Ant1-1 is the extension direction of the top frame, and the polarization direction of the sub-screen antenna Ant1-2 is the direction perpendicular to the extension direction of the top frame, that is, the polarization directions of the main screen antenna Ant1-1 and the sub-screen antenna Ant1-2 are completely orthogonal or approximately orthogonal. In this way, even if the main screen antenna and the sub-screen antenna are of the same frequency and overlap, good isolation can be obtained, and the radiation patterns are complementary, which is particularly beneficial to the MIMO antenna design of electronic devices with folding screens. Moreover, it is not necessary to isolate multiple antennas of the same frequency band in physical positions. For example, the main screen antenna Ant1-1 and the sub-screen antenna Ant1-2 do not need to be staggered in physical positions, and two or more antennas of the same frequency with high isolation can be obtained, making full use of the antenna design space of electronic devices with folding screens.

[0077] like Figure 2A-2B As shown, the electronic device 10 may be designed with two or more pairs of such main screen antennas and sub-screen antennas, which can cover multiple frequency bands and form MIMO antennas of multiple different frequency bands. For example, the main screen antenna Ant1-1 and the sub-screen antenna Ant1-2 may constitute a Wi-Fi MIMO antenna, the main screen antenna Ant2-1 and the sub-screen antenna Ant2-2 may constitute a high-frequency (such as 3.5GHz) MIMO antenna, and the main screen antenna Ant3-1 and the sub-screen antenna Ant3-2 may constitute a low-frequency (such as 900MHz) MIMO antenna.

[0078] The antenna design provided in the embodiment of the present application can be applied to Figure 1A-Figure 1C Exemplary electronic devices such as mobile phones and tablet computers with foldable screens.

[0079] First, the common-mode antenna mode and the differential-mode antenna mode involved in the embodiments of the present application are introduced.

[0080] 1. Common mode (CM) line antenna mode

[0081] like Figure 3A As shown, the linear antenna 101 may include two radiators: radiator 101-A and radiator 101-B, which are on the same straight line and extend in opposite directions. The two ends of the radiator 101-A and the radiator 101-B close to each other (such as end 103 and end 105) may be connected to the positive electrode of the feed source. The phase difference of the RF signals fed into the two radiators is 0°.

[0082] like Figure 3A As shown, the currents at the feeding point are in the same direction, and this feeding can be called common mode feeding. The current on the wire antenna 101 is distributed in the opposite direction. Here, the current reverse distribution means that the direction of the main current excited is basically opposite, for example Figure 3A As shown, the direction of the main current on the left half of the linear antenna 101 is from right to left, and the direction of the main current on the right half of the linear antenna 101 is from left to right. Figure 3A The antenna mode excited by the antenna shown can be called a linear antenna CM mode, and the antenna can be called a CM linear antenna. The linear antenna CM mode can be generated by two radiators working in 1 / 4 wavelength modes respectively.

[0083] Figure 3B The radiation pattern of the linear antenna 101 is simplified, and it can be seen that the radiation direction of the linear antenna CM pattern is the same as the extension direction of the linear antenna 101, that is, the polarization direction is the same as the extension direction of the linear antenna 101. Polarization is a radiation characteristic that describes the spatial orientation of the electromagnetic wave field intensity vector. The spatial orientation of the electric field vector can usually be used as the polarization direction of the electromagnetic wave, and it can refer to the spatial orientation of the electric field vector in the maximum radiation direction (main lobe direction) of the antenna. In practical applications, the polarization direction of the linear antenna 101 and the extension direction of the linear antenna 101 may not be exactly the same, and there may be a slight deviation, such as a deviation within 30°.

[0084] 2. Differential mode (DM) wire antenna mode

[0085] like Figure 4A As shown, the radiator structure of the wire antenna 101 and Figure 3A The radiator structure of the wire antenna 101 shown is the same. The difference is that the two ends of the radiator 101-A and the radiator 101-B close to each other (such as end 103 and end 105) can be connected to the positive and negative electrodes of the feed source respectively. The phase difference of the RF signals fed into the two radiators is 180°.

[0086] like Figure 4AAs shown, the current at the feeding point is reversed, and this feeding can be called differential mode feeding. The current on the antenna 101 is distributed in the same direction. Here, the current distribution in the same direction means that the directions of the main currents excited are basically the same, for example Figure 4A As shown, the direction of the main current of the wire antenna 101 is from right to left. Figure 4A The antenna mode excited by the antenna shown can be called a linear antenna DM mode, and the antenna can be called a DM linear antenna. The linear antenna DM mode can be generated when the entire linear antenna 101 works in a 1 / 2 wavelength mode.

[0087] Figure 4B The radiation pattern of the linear antenna 101 is simplified, and it can be seen that the radiation direction of the linear antenna DM mode is perpendicular to the extension direction of the linear antenna 101, that is, the polarization direction is perpendicular to the extension direction of the linear antenna 101. In practical applications, the polarization direction of the linear antenna 101 and the extension direction of the linear antenna 101 may not be completely perpendicular, and there may be a slight deviation, for example, a deviation within 30°, so as to form an approximately perpendicular direction.

[0088] 3. Common mode (CM) slot antenna mode

[0089] like Figure 5A As shown, the slot antenna 108 may include: a slot 109, a slot 107 is provided on one side of the slot 109, and the slot 107 can connect the slot 109 to the external free space. The slot 107 can be specifically opened in the middle position of the side. Here, the middle position refers to the midpoint of the side, that is, the position where the slot 107 is located covers the midpoint. The slot 107 can be connected to the feed source, for example, the radiators at both ends of the slot 107 can be connected to the feed source. Specifically, the radiator at one end of the slot 107 is connected to the positive pole of the feed source, and the radiator at the other end of the slot 107 is connected to the negative pole of the feed source.

[0090] Figure 5A The feeding method shown will make the electric field at the feeding point (i.e., the slot 107) in the same direction, and this feeding can be called common mode feeding. The electric field is symmetrically distributed in the opposite direction on the slot 109. Here, the opposite distribution of the electric field means that the direction of the main electric field excited is basically opposite, for example Figure 5A As shown, the direction of the main electric field on the left half of the groove 109 is from top to bottom, and the direction of the main electric field on the right half of the groove 109 is from bottom to top. Figure 5A The antenna mode excited by the antenna shown can be called a slot antenna CM mode, and the antenna can be called a CM slot antenna. The slot antenna CM mode can be generated when the slot parts on both sides of the slot 107 each work in a 1 / 4 wavelength mode.

[0091] Figure 5BThe radiation pattern of the slot antenna 108 is simplified, and it can be seen that the radiation direction of the slot antenna CM pattern is the same as the extension direction of the slot 109, that is, the polarization direction is parallel to the extension direction of the slot 109. In actual applications, the polarization direction of the slot antenna 108 and the extension direction of the slot antenna 108 may not be completely the same, and there may be a slight deviation, for example, a deviation within 30°.

[0092] 4. Differential mode (DM) slot antenna mode

[0093] like Fig. 6A As shown, the slot antenna 110 may include: a slot 114, which may be specifically formed on the floor, for example, by making a slot on the floor. The middle position of the slot 114 may be connected to a feed source, for example, radiators on both sides of the middle position of the slot 114 may be connected to the feed source. Here, the middle position of the slot 114 is connected to the feed source, which means that the connection between the feed line of the feed source and one side of the slot 114 (for example, the side formed by the metal frame) covers the midpoint of the side. Specifically, the middle position of the radiator on one side of the slot 114 may be connected to the positive pole of the feed source, and the middle position of the radiator on the other side of the slot 114 may be connected to the negative pole of the feed source. Here, the positive / negative pole of the feed source is connected to the middle position of the radiator, which means that the connection between the positive / negative pole of the feed source and the radiator covers the midpoint of the radiator.

[0094] Fig. 6A The feeding method shown will cause the electric field at the feeding point 112 to be reversed, and this feeding can be called differential mode feeding. The electric field is symmetrically distributed in the same direction on the slot 114. Here, the electric field is distributed in the same direction means that the direction of the main electric field excited is basically the same, for example Fig. 6A As shown, the direction of the main electric field of the slot 114 is from top to bottom. Fig. 6A The antenna mode excited by the antenna shown can be called a slot antenna DM mode, and the antenna can be called a DM slot antenna. The slot antenna DM mode can be generated when the entire slot 114 works in a 1 / 2 wavelength mode.

[0095] Figure 6B The radiation pattern of the slot antenna 110 is simplified, and it can be seen that the radiation direction of the slot antenna DM pattern is perpendicular to the extension direction of the slot 114, that is, the polarization direction is perpendicular to the extension direction of the slot 114. In practical applications, the polarization direction of the slot antenna 110 and the extension direction of the slot 114 may not be completely perpendicular, and there may be a slight deviation, such as a deviation within 30°, to form an approximately perpendicular direction.

[0096] Among the above-mentioned antennas, since the polarization directions of the common-mode antenna and the differential-mode antenna are orthogonal, the isolation between the two is very high. Here, orthogonality can refer to the main lobe direction of the two antennas, that is, the direction with the largest radiation energy. In practical applications, the polarization directions of the common-mode antenna and the differential-mode antenna may not be completely orthogonal, and there may be a slight deviation, such as a deviation within 30°, to form an approximate orthogonality.

[0097] Based on the above-mentioned antenna modes, the antenna design scheme provided in the embodiments of the present application is described below.

[0098] Fig. 7A The example shows that the main screen antenna and the auxiliary screen antenna are DM line antenna and CM line antenna respectively.

[0099] like Fig. 7A As shown in the figure, when the folding screen of the electronic device is in the folded state, the main and sub-screen antennas overlap, and the overlap can be complete or partial. The main screen antenna may include a conductor 21-A and a feeding point 23 arranged on the conductor 21-A, and the feeding point 23 may be connected to a feed source. The conductor 21-A on the main screen may be a section of the metal frame of the main screen, or a metal strip printed on the inner side of the main screen frame. The conductor 21-A may present a current distributed in the same direction, which stimulates the front Figure 4A-4B The wire antenna DM mode shown. The current distributed in the same direction can be the main current distributed on the conductor 21-A, and the current can be generated by the fundamental mode of the main screen antenna. The auxiliary screen antenna may include a section of conductor 21-B, a feeding point 24 arranged on the conductor 21-B, and a grounding branch 25. The feeding point 24 can be connected to the feed source, and the grounding branch 25 can be connected to the floor. The conductor 21-B on the auxiliary screen can be a section of the metal frame of the auxiliary screen, or it can be a metal strip printed on the inner side of the auxiliary screen frame. The conductor 21-B can present a symmetrically reversely distributed current, which stimulates the previous Figure 3A-3B The wire antenna CM mode shown. The reverse distributed current may be the main current distributed on the conductor 21-A, which may be generated by the fundamental mode of the main screen antenna.

[0100] Since the main and auxiliary screen antennas are DM line antennas and CM line antennas respectively, when the folding screen of the electronic device is in the folded state, the main and auxiliary screen antennas operating in the same frequency band can also have good isolation.

[0101] In addition to the wire antenna CM mode, Fig. 7AThe secondary screen antenna shown can actually stimulate another antenna mode: the wire antenna DM mode. The principle it is based on is: without considering the feeding, a conductor of any shape can have multiple characteristic modes (characteristic modes), and one or several of the characteristic modes can be enhanced through the feeding design, so as to select the desired characteristic mode. Here, the wire antenna DM mode and the wire antenna CM mode are the desired characteristic modes selected by the secondary screen antenna through feeding. When the main and secondary screen antennas overlap due to the folding of the folding screen, in order to avoid the wire antenna DM mode excited on the secondary screen antenna interfering with the slot antenna DM mode of the main screen antenna, the wire antenna DM mode excited on the secondary screen antenna and the slot antenna DM mode of the main screen antenna can be adjusted to different frequency bands.

[0102] Fig. 7A In the structure, the main screen antenna can be connected to the ground in parallel with an inductor, so that the main screen antenna can be transformed into a CM line antenna, and the main current distribution on it is the current reverse distribution. At this time, the auxiliary screen antenna can be connected to the ground in series with a capacitor to short-circuit the grounding branch, so that the auxiliary screen antenna can be transformed into a DM line antenna, and the main current distribution on it is the current unidirectional distribution.

[0103] Figure 7B The example shows that the main screen antenna and the auxiliary screen antenna are DM line antenna and CM slot antenna respectively.

[0104] like Figure 7B As shown, when the folding screen of the electronic device is in the folded state, the main and sub-screen antennas overlap, and the overlap can be complete or partial. The main screen antenna may include a conductor 21-A and a feeding point 23 arranged on the conductor 21-A, and the feeding point 23 may be connected to a feed source. The conductor 21-A on the main screen may be a section of the main screen metal frame, or a metal strip printed on the inner side of the main screen frame. The conductor 21-A may present a current distributed in the same direction, for example, to stimulate the front Figure 4A-4B The linear antenna DM mode shown. The auxiliary screen antenna may include a slot 26 formed on the conductor 21-C, for example, a slot is formed on the conductor 21-C, and a gap 28 is provided on one side of the slot 26, and the gap 28 may be specifically opened in the middle position of the side. Here, the middle position refers to the midpoint of the side, that is, the position of the gap 28 covers the midpoint of the side. The conductor 21-C on the auxiliary screen may be formed by the auxiliary screen metal frame and the auxiliary screen PCB floor, for example, the slot 26 in the conductor 21-C is formed on the auxiliary screen PCB floor. That is, one side of the slot 26 is formed by the auxiliary screen metal frame, and the other side is formed by the auxiliary screen PCB floor. A feeding point 27 may be provided on the side of the slot 26 where the gap 28 is provided, and the feeding point 27 may be connected to a feed source. A symmetrically reversely distributed electric field may be presented in the slot 26, which excites the previous Figure 5A-Figure 5BThe slot antenna CM mode shown. The reversely distributed electric field may be the main electric field distributed in the slot 26, and the electric field may be generated by the fundamental mode of the secondary screen antenna.

[0105] Since the main and auxiliary screen antennas are DM line antennas and CM slot antennas respectively, when the folding screen of the electronic device is in the folded state, the main and auxiliary screen antennas operating in the same frequency band can also have good isolation.

[0106] Figure 7C The example shows that the main screen antenna and the auxiliary screen antenna are CM line antenna and DM slot antenna respectively.

[0107] like Figure 7C As shown, when the folding screen of the electronic device is in the folded state, the main and sub-screen antennas overlap, and the overlap can be complete or partial. The main screen antenna may include a conductor 21-B, a feeding point 24 arranged on the conductor 21-B, and a grounding branch 25. The feeding point 24 can be connected to the feed source, and the grounding branch 25 can be connected to the floor. The conductor 21-B on the main screen can be a section of the metal frame of the main screen, or it can be a metal strip printed on the inside of the main screen frame. The conductor 21-B can present a symmetrically reversely distributed current, for example, to stimulate the front Figure 3A-3B The wire antenna CM mode shown. The auxiliary screen antenna may include a slot 32 formed by slotting on the conductor 21-D, for example, a slot is formed on the conductor 21-D, and a feeding point 31 may be provided on one side of the slot 32, and the feeding point 31 may be connected to the feed source. The conductor 21-D on the auxiliary screen may be formed by the auxiliary screen metal frame and the auxiliary screen PCB floor, for example, the slot 32 in the conductor 21-D is formed on the auxiliary screen PCB floor. That is, one side of the slot 32 is formed by the auxiliary screen metal frame, and the other side is formed by the auxiliary screen PCB floor. The electric field distributed in the same direction may be presented in the slot 32, which stimulates the previous Figure 6A-6B The slot antenna DM mode shown. The electric field distributed in the same direction can be the main electric field distributed in the slot 32, and the electric field can be generated by the fundamental mode of the secondary screen antenna.

[0108] Since the main and auxiliary screen antennas are CM line antennas and DM slot antennas respectively, when the folding screen of the electronic device is in the folded state, the main and auxiliary screen antennas operating in the same frequency band can also have good isolation.

[0109] In addition to the wire antenna CM mode, Figure 7C The main screen antenna shown can actually stimulate another antenna mode: the wire antenna DM mode. The principle has been introduced before. When the main and sub-screen antennas overlap due to the folding of the folding screen, in order to avoid the wire antenna DM mode of the main screen antenna interfering with the slot antenna DM mode of the sub-screen antenna, the wire antenna DM mode stimulated on the main screen antenna and the slot antenna DM mode of the sub-screen antenna can be adjusted to different frequency bands.

[0110] Fig.7D The example shows that the main screen antenna and the auxiliary screen antenna are CM slot antenna and DM slot antenna respectively.

[0111] like Fig.7D As shown, when the folding screen of the electronic device is in a folded state, the main and sub-screen antennas overlap, and the overlap may be complete or partial. The main screen antenna may include a slot 26 formed on the conductor 21-C, for example, a slot is formed on the conductor 21-C, and a gap 28 is provided on one side of the slot 26, and the gap 28 may be specifically opened in the middle position of the side. Here, the middle position refers to the midpoint of the side, that is, the position of the gap 28 covers the midpoint of the side. A feeding point 27 may be provided on the side where the slot 26 is provided with the gap 28, and the feeding point 27 may be connected to a feed source. The conductor 21-C on the main screen may be formed by the main screen metal frame and the sub-screen PCB floor, for example, the slot 26 in the conductor 21-C is formed on the main screen PCB floor. That is, one side of the slot 26 is formed by the main screen metal frame, and the other side is formed by the main screen PCB floor. The electric field may be symmetrically and reversely distributed in the slot 26, which excites the front Figure 5A-Figure 5B The slot antenna CM mode shown. The reversely distributed electric field may be the main electric field distributed in the slot 26, which may be generated by the fundamental mode of the main screen antenna. The sub-screen antenna may include a slot 32 formed by slotting on the conductor 21-D, for example, a slot formed on the conductor 21-D, and a feeding point 31 may be provided on one side of the slot 32, and the feeding point 31 may be connected to the feed source. The conductor 21-D on the sub-screen may be formed by the sub-screen metal frame and the sub-screen PCB floor, for example, the slot 32 in the conductor 21-D is formed on the sub-screen PCB floor. That is, one side of the slot 32 is formed by the sub-screen metal frame, and the other side is formed by the sub-screen PCB floor. The slot 32 may present an electric field distributed in the same direction, which stimulates the previous Figure 6A-6B The slot antenna DM mode shown. The electric field distributed in the same direction can be the main electric field distributed in the slot 32, and the electric field can be generated by the fundamental mode of the secondary screen antenna.

[0112] Since the main and auxiliary screen antennas are CM slot antennas and DM slot antennas respectively, when the folding screen of the electronic device is in the folded state, the main and auxiliary screen antennas operating in the same frequency band can also have good isolation.

[0113] above Figure 7A-7DIn the several schemes shown, the main screen antenna can be set on the main screen, and the sub-screen antenna can be set on the sub-screen. Specifically, conductor 21-A and conductor 21-B can be a section of suspended metal strip, which can be formed by a metal frame, a metal middle frame, etc. of an electronic device. For electronic devices with non-metallic industrial design (industry design, ID), conductor 21-A and conductor 21-B can be a section of metal strip printed on the inner surface of a non-metallic frame, or a section of metal strip printed on the inner surface of a non-metallic frame using conductive silver paste. Specifically, grooves 26 and 32 can be formed on conductors such as PCB floors and metal middle frames, for example, by slotting on conductors. The implementation of the main and sub-screen antennas in the whole machine will be described in detail in the following embodiments, which will not be repeated here.

[0114] above Figure 7A-7D In the several solutions shown, the main and auxiliary screen antennas can be swapped, for example Fig. 7A The main screen antenna in the can be set on the secondary screen to become the secondary screen antenna, and Fig. 7A The secondary screen antenna can be set on the main screen to become the main screen antenna.

[0115] Implementation of the above Figure 7A-7D In the several solutions shown, when the folding screen of the electronic device is in the folded state, the overlapping main and auxiliary screen antennas working in the same frequency band can also have good isolation, and the radiation patterns are complementary. Therefore, it is not necessary to obtain two or more high-isolation antennas of the same frequency through physical isolation, and the antenna design space of the electronic device with a folding screen can be fully utilized.

[0116] The following will introduce in detail the implementation of the main and auxiliary screen antennas in the whole device in combination with several embodiments. In the electronic device, the dielectric constant of the material filled in the hollow interior formed between the metal frame and the PCB floor and the interior of the gap on the metal frame can be 3.0, and the loss angle can be 0.01.

[0117] Embodiment 1

[0118] Figure 8A-8B The antenna structure provided in the first embodiment is exemplarily shown. Fig. 8A The antenna structure formed when the folding screen 11 is in the unfolded state is shown. Figure 8B The antenna structure formed when the folding screen 11 is in the folded state is shown. The antenna structure provided in the first embodiment includes a main screen antenna and a sub-screen antenna, wherein the main and sub-screen antennas can be CM line antennas and DM line antennas respectively.

[0119] like Fig. 8AAs shown, the main screen antenna can be realized by hollowing out the PCB floor and opening a gap in the metal frame. Specifically, a suspended metal frame 41-A can be formed by opening a gap in a specific part of the main screen frame 12-1 (for example, the bottom frame part), such as the two gaps 35-A and 35-B with a width of 0.9-2.0 mm, and hollowing out the PCB floor adjacent to the specific part of the main screen frame 12-1. The hollowed-out part can form a groove 31-A, which is parallel to the suspended metal frame 41-A, and is used to separate the suspended metal frame 41-A and the PCB floor of the main screen, so that the suspended metal frame 41-A is suspended on the ground, that is, a clearance is formed. The length of the groove 31-A is greater than the length of the suspended metal frame 41-A, that is, along the extension direction of the specific part of the main screen frame 12-1, it crosses the two gaps 35-A and 35-B to form a groove longer than the suspended metal frame 41-A, so that the metal frame between the two gaps 35-A and 35-B forms a suspended metal frame, thereby forming a linear antenna radiator. The suspended metal frame 41-A can be equivalent to Fig. 7A In addition, the non-hollowed-out portion 32 can be used to form a grounding branch connected to the suspended metal frame 41-A. Fig. 8A The strip floor branch shown. Not limited to the strip floor branch, the grounding branch can also be realized by a metal spring arranged on the PCB floor of the main screen part, and the metal spring can be connected to the suspended metal frame 41-A. The grounding branch can also be a metal branch connected to the PCB floor extending from the metal frame of the main screen part. This specific part of the main screen frame 12-1 can be called the first main screen frame part.

[0120] Fig. 8AThe feeding method of the main screen antenna is also shown. A feeding point 33-A can be provided on the suspended metal frame 41-A to connect the feed line 34-A to the feed source. The feeding point 33-A can be provided adjacent to the grounding point to excite the CM mode of the outgoing antenna. The grounding point is the connection between the grounding branch (non-hollowed-out part) and the suspended metal frame 41-A. The grounding point can be provided in the middle of the suspended metal frame 41-A, or it can be provided at a position adjacent to the middle on the suspended metal frame 41-A. The grounding point being provided in the middle of the suspended metal frame 41-A can mean that the grounding point is provided at the midpoint of the suspended metal frame 41-A, that is, the connection between the grounding branch and the suspended metal frame 41-A covers the midpoint. The proximity can mean that the distance from the grounding point to the middle position is not more than 1 / 8 of the working wavelength. Not limited to being provided adjacent to the grounding point, the feeding point 33-A can also be provided adjacent to the open end of the suspended metal frame 41-A. Here, the feeding point 33-A being adjacent to the grounding point may mean that the distance from the feeding point 33-A to the grounding point is greater than 0 and less than 1 / 8 of the working wavelength. The feeding point 33-A being adjacent to the open end of the suspended metal frame 41-A may mean that the distance from the feeding point 33-A to the open end is not less than 1 / 8 of the working wavelength, and may even be equal to 0. The working wavelength refers to the working wavelength of the linear antenna CM mode of the main screen antenna. The calculation method of the working wavelength will be introduced later, so it will not be expanded here.

[0121] It should be understood that the midpoint of the suspended metal frame 41-A can be considered as the midpoint of the length of the suspended metal frame 41-A, and the length here can be considered as the electrical length. The electrical length can be represented by the ratio of the physical length (i.e., mechanical length or geometric length) multiplied by the transmission time of an electrical or electromagnetic signal in a medium to the time required for the signal to pass through the same distance as the physical length of the medium in free space. The electrical length can satisfy the following formula:

[0122]

[0123] Where L is the physical length, a is the transmission time of the electrical or electromagnetic signal in the medium, and b is the transmission time in free space;

[0124] Alternatively, electrical length can also refer to the ratio of physical length (i.e. mechanical length or geometric length) to the wavelength of the transmitted electromagnetic wave. The electrical length can satisfy the following formula:

[0125]

[0126] Where L is the physical length and λ is the wavelength of the electromagnetic wave.

[0127] Similarly, if Fig. 8AAs shown, the secondary screen antenna can also be realized by hollowing out the PCB floor and opening a gap on the metal frame. Specifically, a suspended metal frame 41-B can be formed by opening a gap on a specific part of the secondary screen frame 12-3 (for example, the bottom frame part), such as the two gaps 36-A and 36-B, and hollowing out the PCB floor of the specific part adjacent to the secondary screen frame 12-3. The hollowed-out part can form a groove 31-B, which is parallel to the suspended metal frame 41-B, and is used to separate the suspended metal frame 41-B and the PCB floor of the secondary screen, so that the suspended metal frame 41-B is suspended on the ground, that is, to form a clearance. The length of the groove 31-B is greater than the length of the suspended metal frame 41-B, that is, along the extension direction of the specific part adjacent to the secondary screen frame 12-3, it crosses the two gaps 36-A and 36-B to form a groove that is longer than the suspended metal frame 41-B, so that the metal frame between the two gaps 36-A and 36-B forms a suspended metal frame, thereby forming a linear antenna radiator. The suspended metal frame 41-B can be equivalent to Fig. 7A The conductor 21-A in the secondary screen antenna. Unlike the main screen antenna, the suspended metal frame 41-B in the secondary screen antenna is not provided with a grounding branch, and there is no structure like the non-hollowed-out portion 32 in the main screen antenna. This specific portion of the secondary screen frame 12-1 can be called the first secondary screen frame portion.

[0128] Fig. 8A The feeding method of the secondary screen antenna is also shown. A feeding point 33-B may be provided on the suspended metal frame 41-B to connect the feed line 34-B to the feed source. The feeding point 33-B may be provided near the middle position of the suspended metal frame 41-B, which may be referred to as intermediate bias feeding to excite the DM mode of the outgoing antenna. The feeding point 33-B being provided at the middle position of the suspended metal frame 41-B may mean that the feeding point 33-B is provided at the midpoint of the suspended metal frame 41-B, that is, the connection between the feed line 34-B and the suspended metal frame 41-B covers the midpoint. Not limited to being provided near the middle position, the feeding point 33-B may also be provided adjacent to the open end of the suspended metal frame 41-B. Here, proximity may mean that the distance from the feed point 33-B to the middle position of the suspended metal frame 41-B is less than 1 / 16 of the working wavelength, or the distance from the feed point 33-B to the open end of the suspended metal frame 41-B is less than 1 / 16 of the working wavelength, and the proximity may also include the case where the distance is equal to 0. The working wavelength refers to the working wavelength of the linear antenna DM mode of the secondary screen antenna.

[0129] Fig. 8A The main screen antenna and the secondary screen antenna in can be antennas operating in the same frequency band. The current distribution on the main screen antenna can be referred to Figure 3A , that is, it is symmetrically distributed in reverse on the suspended metal frame 41-A. The current distribution on the secondary screen antenna can be referred to Figure 4A, that is, they are distributed in the same direction on the suspended metal frame 41-B. In addition, the main and auxiliary screen antennas can also stimulate the floor to generate Figure 8C The current distribution is shown in Figure 1. The radiation direction of the main screen antenna can be referenced Figure 3B , that is, radiate along the direction of the suspended metal frame 41-A. The radiation direction of the secondary screen antenna can be referred to Figure 4B , that is, radiating in a direction perpendicular to the suspended metal frame 41-B.

[0130] Figure 8B The positional relationship between the main screen antenna and the secondary screen antenna when the folding screen 11 is in the folded state is exemplified. When the folding screen 11 is in the folded state, the position of the main screen antenna and the position of the secondary screen antenna overlap. For example, the position of the main screen antenna is the position of the main screen frame part (i.e., the first main screen frame part) forming the suspended metal frame 41-A, and the position of the secondary screen antenna is the position of the secondary screen frame part (i.e., the first secondary screen frame part) forming the suspended metal frame 41-B. The overlap does not affect the performance of the main screen antenna and the secondary screen antenna, because the main and secondary screen antennas are CM line antennas and DM line antennas with orthogonal radiation directions, respectively, and can have good isolation even if they work in the same frequency band (e.g., B1 band, B3 band, B7 band, N77 band, or for example, 3.6GHz-4.1GHz, etc.). In this way, two antennas of the same frequency band can be obtained in the overlapping area of ​​the main and secondary screens, and the directional patterns are complementary.

[0131] The folding screen antenna provided in the first embodiment can be further transformed into Figure 9A-9B As shown, that is, the main screen antenna can be transformed from a CM line antenna to an inverted F antenna (IFA) and operate in a 1 / 4 wavelength mode. Fig. 9C The current distribution excited by the main screen IFA line antenna and the sub-screen DM line antenna is shown. The distribution of the floor current excited by the main screen IFA line antenna is consistent with the distribution of the floor current of the CM line antenna, which makes the radiation direction of the main screen IFA line antenna basically the same as the radiation direction of the CM line antenna and orthogonal to the radiation direction of the sub-screen DM line antenna. The simulation experiment shows that the maximum radiation directions of the main screen IFA line antenna and the sub-screen DM line antenna are orthogonal. Therefore, even if the two antennas work in the same frequency band, high isolation can be obtained when the folding screen 11 is in the folded state. Figure 9A-9B The simplified structure of the antenna in the folded state can be as follows Fig.9D For example, the main screen antenna can be an antenna working in the N77 frequency band (for example, 3.6GHz-4.1GHz), and the working mode is 1 / 4 wavelength mode, and the secondary screen antenna can also be an antenna working in the N77 frequency band, and the working mode is 1 / 2 wavelength mode. Fig.9E It can be seen that good isolation can be achieved between the main screen N77 antenna and the secondary screen N77 antenna.

[0132] In order to cover more frequency bands, multiple main screen antennas can be designed at the position overlapping with the secondary screen DM line antenna, for example, multiple main screen IFA antennas can be designed, which can include IFA antennas that work in the same frequency band as the secondary screen DM line antenna, or IFA antennas that work in different frequency bands than the secondary screen DM line antenna. Fig.9F As shown, two IFA antennas can be set on the main screen, one can be an N77 band antenna, and the other can be a mid-high band (MHB) antenna. Figure 9G-9H It can be seen that the folding screen is in the folded state. Fig.9F The mutual influence of the antennas in the antenna shown is small, and the radiation efficiency and system efficiency are still high.

[0133] When the main screen antenna is transformed from a CM line antenna to an inverted F antenna, the secondary screen antenna can also be a DM slot antenna, and high isolation can still be achieved when the main and secondary screen antennas overlap. The specific implementation of the DM slot antenna in the whole machine can refer to the subsequent Figure 10A-10B Example Figure 12A-12B DM slot antenna in an embodiment.

[0134] Embodiment 2

[0135] Figure 10A-10B The antenna structure provided by the second embodiment is exemplified. Fig. 10A The antenna structure formed when the folding screen 11 is in the unfolded state is shown. Fig. 10B The antenna structure formed when the folding screen 11 is in the folded state is shown. The antenna structure provided in the second embodiment includes a main screen antenna and a sub-screen antenna, wherein the main and sub-screen antennas can be CM line antennas and DM slot antennas respectively.

[0136] like Fig. 10A As shown, the main screen antenna and Fig. 8A The main screen antenna shown in the figure can be realized by hollowing out the PCB floor and opening a gap in the metal frame. For details, please refer to Fig. 8A The relevant description will not be repeated here.

[0137] like Fig. 10A As shown, the antenna of the secondary screen can be realized by hollowing out the PCB floor. Specifically, the PCB floor of a specific part (such as the bottom frame part) adjacent to the secondary screen metal frame 12-3 can be hollowed out, and the PCB floor of the hollowed-out secondary screen part and the specific part of the secondary screen metal frame 12-3 are enclosed to form a groove 52-B. Both ends of the groove 52-B are closed (can be called closed ends), one side of the groove 52-B is the secondary screen metal frame 12-3, and the other side is the PCB floor of the secondary screen part. The groove 52-B is Figure 7CSlot 32 in. Fig. 10A The feeding method of the secondary screen antenna is also shown. A feeding point 53-B may be provided on the metal frame side of the slot 52-B (such as the metal frame 51-B) to connect the feed line 54-B to the feed source, and no gap is provided on the side of the slot 52-B where the feeding point is provided. The feeding point 53-B may be provided adjacent to the middle position of the metal frame 51-B to stimulate the DM mode of the slot antenna. Not limited to being provided adjacent to the middle position, the feeding point 53-B may also be provided adjacent to the closed end of the slot 52-B. Here, proximity may mean that the distance from the feeding point 53-B to the middle position or the closed end is less than 1 / 16 of the working wavelength, and the proximity may also include the case where the distance is equal to 0.

[0138] Here, the feeding point 53-B is set at the middle position of the suspended metal frame 51-B (the case where the distance is equal to 0), which may mean that the feeding point 53-B is set at the midpoint of the suspended metal frame 51-B, that is, the connection between the feeding line 54-B and the suspended metal frame 51-B covers the midpoint.

[0139] Fig. 10A The main screen antenna and the secondary screen antenna in can be antennas operating in the same frequency band. The current distribution on the main screen antenna can be referred to Figure 3A , that is, they are symmetrically distributed in reverse on the suspended metal frame 51-A. The electric field distribution on the secondary screen antenna can be referred to Fig. 6A , that is, they are distributed in the same direction in slot 52-B. The radiation direction of the main screen antenna can be referred to Figure 3B , that is, radiate along the direction of the suspended metal frame 41-A. The radiation direction of the secondary screen antenna can be referred to Figure 6B , that is, radiating in a direction perpendicular to the slot 52-B.

[0140] Fig. 10B The positional relationship between the main screen antenna and the secondary screen antenna when the folding screen 11 is in the folded state is exemplified. When the folding screen 11 is in the folded state, the position of the main screen antenna overlaps with the position of the secondary screen antenna. This overlap does not affect the performance of the main screen antenna and the secondary screen antenna, because the main and secondary screen antennas are CM line antennas and DM slot antennas with orthogonal radiation directions, respectively, and can have good isolation even when working in the same frequency band. In this way, two antennas of the same frequency band can be obtained in the overlapping area of ​​the main and secondary screens, and the directional patterns are complementary.

[0141] Embodiment 3

[0142] Figure 11A-11B The antenna structure provided in the third embodiment is exemplified. Fig.11A The antenna structure formed when the folding screen 11 is in the unfolded state is shown. Fig. 11BThe antenna structure formed when the folding screen 11 is in the folded state is shown. The antenna structure provided in the third embodiment includes a main screen antenna and a sub-screen antenna, wherein the main and sub-screen antennas can be CM slot antennas and DM line antennas respectively.

[0143] like Fig.11A As shown, the main screen antenna can be realized by hollowing out the PCB floor and opening a gap in the metal frame. Specifically, the PCB floor of a specific part adjacent to the main screen metal frame 12-1 (for example, the bottom frame part) can be hollowed out, and the groove 62-A is formed by enclosing the hollowed-out PCB floor of the main screen part and the main screen metal frame 12-1. The groove 62-A is closed at both ends, one side of the groove 62-B is the main screen metal frame 12-1, and the other side is the PCB floor of the main screen part. In addition, a gap, such as gap 67, can be opened on the metal frame on one side of the groove 62-A to connect the groove 62-A to the external free space. The groove 62-A is Figure 7B The slot 26 in the middle, the gap 67 is Figure 7B The gap 28 in the slot 62-A. The gap 67 can be provided in the middle of the metal frame on one side of the slot 62-A. The middle position refers to the midpoint on one side of the slot 62-A, i.e., the position of the gap 67 covers the midpoint.

[0144] Fig.11A The feeding method of the main screen antenna is also shown. A feeding point 63-A may be provided on the side of the metal frame of the slot 62-A to connect the feed line 64-A to the feed source. The feeding point 63-A may be provided adjacent to the slot 67 to excite the CM mode of the outgoing antenna. Not limited to being adjacent to the slot 67, the feeding point 63-A may also be provided adjacent to the closed end of the slot 62-A. Here, the proximity of the feeding point 63-A to the slot 67 may mean that the distance from the feeding point 63-A to the slot 67 is greater than 0 and less than 1 / 8 of the working wavelength. The proximity of the feeding point 63-A to the closed end of the slot 62-A may mean that the distance from the feeding point 63-A to the closed end is less than 1 / 8 of the working wavelength, and the proximity may also include the case where the distance is equal to 0. The working wavelength refers to the working wavelength of the slot antenna CM mode of the main screen antenna. The calculation method of the working wavelength will be introduced later, so it will not be expanded here.

[0145] Here, the distance from the feeding point 63 -A to the slot 67 may refer to the distance from the feeding point 63 -A to the midpoint of the slot 67 , or may refer to the distance from the feeding point 63 -A to both ends of the slot 67 .

[0146] like Fig.11A As shown, the secondary screen antenna and Fig. 8A The secondary screen antenna shown in the figure can be realized by hollowing out the PCB floor and opening a gap in the metal frame. For details, please refer to Fig. 8A The relevant instructions for the secondary screen antenna in the video will not be repeated here.

[0147] Fig.11A The main screen antenna and the secondary screen antenna in the can be antennas operating in the same frequency band. The electric field distribution on the main screen antenna can be referred to Figure 7B , that is, it is symmetrically distributed in the opposite direction on the slot 62-A. The current distribution on the secondary screen antenna can be referred to Figure 7B , that is, they are distributed in the same direction on the suspended metal frame 61-B. The radiation direction of the main screen antenna can be referred to Figure 5B , that is, radiate along the direction of slot 62-A. The radiation direction of the secondary screen antenna can be referred to Figure 4B , that is, radiating in a direction perpendicular to the suspended metal frame 61-B.

[0148] Fig. 11B The positional relationship between the main screen antenna and the secondary screen antenna when the folding screen 11 is in the folded state is exemplified. When the folding screen 11 is in the folded state, the position of the main screen antenna and the position of the secondary screen antenna overlap. This overlap does not affect the performance of the main screen antenna and the secondary screen antenna, because the main and secondary screen antennas are CM slot antennas and DM line antennas with orthogonal radiation directions, respectively, and can have good isolation even when working in the same frequency band. In this way, two antennas of the same frequency band can be obtained in the overlapping area of ​​the main and secondary screens, and the directional patterns are complementary.

[0149] Embodiment 4

[0150] Figure 12A-12B The antenna structure provided by the fourth embodiment is exemplified. Fig. 12A The antenna structure formed when the folding screen 11 is in the unfolded state is shown. Fig. 12B The antenna structure formed when the folding screen 11 is in the folded state is shown. The antenna structure provided in the fourth embodiment includes a main screen antenna and a sub-screen antenna, wherein the main and sub-screen antennas can be CM slot antennas and DM slot antennas respectively.

[0151] like Fig. 12A As shown, the main screen antenna and Fig.11A The main screen antenna shown in the figure can be realized by hollowing out the PCB floor and opening a gap in the metal frame. For details, please refer to Fig.11A The relevant instructions for the main screen CM slot antenna will not be repeated here.

[0152] like Fig. 12A As shown, the secondary screen antenna and Fig. 10A The secondary screen antenna shown in the figure can be realized by hollowing out the PCB floor and opening a gap in the metal frame. For details, please refer to Fig. 10A The relevant instructions for the secondary screen DM slot antenna will not be repeated here.

[0153] Fig. 12AThe main screen antenna and the secondary screen antenna in the can be antennas operating in the same frequency band. The electric field distribution on the main screen antenna can be referred to Fig.7D , that is, it is symmetrically distributed in the opposite direction on the slot 72-A. The current distribution on the secondary screen antenna can be referred to Fig.7D , that is, they are distributed in the same direction on slot 72-A. The radiation direction of the main screen antenna can be referred to Figure 5B , that is, radiate along the direction of slot 72-A. The radiation direction of the secondary screen antenna can be referred to Figure 6B , that is, radiating in a direction perpendicular to the slot 72-A.

[0154] Fig. 12B The positional relationship between the main screen antenna and the secondary screen antenna when the folding screen 11 is in the folded state is exemplified. When the folding screen 11 is in the folded state, the position of the main screen antenna and the position of the secondary screen antenna overlap. This overlap does not affect the performance of the main screen antenna and the secondary screen antenna, because the main and secondary screen antennas are CM slot antennas and DM slot antennas with orthogonal radiation directions, respectively, and can have good isolation even when working in the same frequency band. In this way, two antennas of the same frequency band can be obtained in the overlapping area of ​​the main and secondary screens, and the directional patterns are complementary.

[0155] The folding screen antenna provided in the above embodiment is arranged at the overlapping position of the folding screen in the folded state, which can realize a same-frequency antenna with good performance, thereby improving the space utilization of the main and sub-screens of the folding screen antenna design. The number of antennas can be expanded, which is particularly beneficial for MIMO antenna design.

[0156] Figure 13A-13B The feeding position of the antenna structure provided in the embodiment of the present application is shown.

[0157] like Fig.13A As shown, the feeding position of the DM line antenna can be set adjacent to the middle position of the radiator. It is not limited to being set adjacent to the middle position, and the feeding position can also be set adjacent to the open end of the radiator. Proximity can mean that the distance from the feeding point to the middle position or the open end of the radiator is less than a first distance value, such as 1 / 16 of the working wavelength of the first distance value, that is, the distance is greater than 0 and less than 1 / 16 of the working wavelength. The proximity can include the case where the distance is equal to 0. Here, the working wavelength refers to the working wavelength of the DM mode of the line antenna. The positional relationship of the feeding position of the DM slot antenna relative to the slot body can be referred to. Fig.13A The slot body can be regarded as the radiator of the slot antenna, and the feeding position can be set near the middle position of the slot body or near the closed end of the slot body. The slot body can be formed by hollowing out the PCB floor and surrounded by the metal frame and the PCB floor as described in the above embodiment.

[0158] like Fig. 13BAs shown, the feeding position of the CM wire antenna can be located adjacent to the grounding point of the radiator (the connection point between the grounding branch and the radiator). Not limited to being located adjacent to the grounding point, the feeding position can also be located adjacent to the open end of the radiator. Here, the feeding point being adjacent to the grounding point can mean that the distance from the feeding point to the grounding point is less than a second distance value, for example, the second distance value is 1 / 8 of the working wavelength, that is, the distance is greater than 0 and less than 1 / 8 of the working wavelength. The feeding point being adjacent to the open end can mean that the distance from the feeding point to the open end is not more than 1 / 8 of the working wavelength, and the proximity can include the case where the distance is equal to 0. The working wavelength refers to the working wavelength of the CM mode of the wire antenna. The positional relationship of the feeding position of the CM slot antenna relative to the slot body can be referred to. Fig. 13B The slot body can be regarded as the radiator of the slot antenna, and the feeding position can be set adjacent to the slit on one side of the slot body, or adjacent to the closed end of the slot body.

[0159] Figure 14A-14G The figure shows the size design of the antenna structure provided in the embodiment of the present application when it is implemented as an antenna for several typical frequency bands.

[0160] like Fig.14A As shown, both the main and sub-screen antennas can be N77 frequency band antennas, and the radiator lengths of the two can be approximately 13 mm, but are not limited to this length. The main and sub-screen N77 antennas can also adjust the antenna radiation length through tuning switches. Fig.14A The isolation between the main and auxiliary screen antennas of the antenna structure shown can be referred to as shown in 9E.

[0161] like Fig. 14B As shown, half the length of the radiator of the main screen antenna can be approximately 24 mm, and the length from the feeding point to the open end can be approximately 6 mm, that is, the main screen antenna can change its size and operate in the medium and high frequency MHB band and B1 / B3 band, but it is not limited to this length. The main screen antenna can also adjust the antenna radiation length through the tuning switch. Fig. 14C Shows Fig. 14B The main screen antenna resonates in the MHB band and the B1 / B3 band.

[0162] like Fig.14D As shown, half the length of the radiator of the main screen antenna can be about 18 mm, and the length from the feeding point to the open end can be 6 mm, that is, the main screen antenna can change its size and work in the medium and high frequency MHB band and B7 band, but it is not limited to this length. The main screen antenna can also adjust the antenna radiation length through the tuning switch. Fig.14E Shows Fig.14D The main screen antenna resonates in the MHB band and the B7 band.

[0163] like Fig.14FAs shown, half the length of the radiator of the main screen antenna can be about 11 mm, and the length from the feeding point to the open end can be 4 mm, that is, the main screen antenna can change its size and work in the medium and high frequency MHB band and N77 band, but it is not limited to this length. The main screen antenna can also adjust the antenna radiation length through the tuning switch. Figure 14G Shows Fig.14F The main screen antenna resonates in the MHB band and the N77 band.

[0164] Not limited to Figure 14A-14G Several typical frequency bands are shown, and the main and sub-screen antennas provided in the embodiments of the present application can also operate in other frequency bands. In the present application, the operating wavelength in a certain wavelength mode of the antenna (such as a half-wavelength mode, etc.) may refer to the wavelength of the signal radiated by the antenna. For example, the half-wavelength mode of a suspended metal antenna can produce resonance in the 1.575GHz frequency band, where the operating wavelength in the half-wavelength mode refers to the wavelength of the signal radiated by the antenna in the 1.575GHz frequency band. It should be understood that the wavelength of the radiated signal in the air can be calculated as follows: wavelength = speed of light / frequency, where frequency is the frequency of the radiated signal. The wavelength of the radiated signal in the medium can be calculated as follows: Wherein, ε is the relative dielectric constant of the medium, and frequency is the frequency of the radiation signal. The gaps and grooves in the above embodiments may be filled with insulating medium.

[0165] The 1 / 16 and 1 / 8 working wavelengths mentioned in the above embodiments, where "working wavelength" may refer to the wavelength corresponding to the center frequency of the resonant frequency. For example, assuming that the center frequency of the B1 uplink frequency band (resonant frequency is 1920MHz to 1980MHz) is 1955MHz, the working wavelength may be the wavelength calculated using the frequency of 1955MHz. Not limited to the center frequency, "working wavelength" may also refer to the wavelength corresponding to the non-center frequency of the resonant frequency.

[0166] The "proximity" mentioned in the above embodiments uses 1 / 16 of the working wavelength and 1 / 8 of the working wavelength as critical values ​​for constraints, but these two values ​​are only used for examples. The feeding point or the grounding branch is adjacent to a certain position (such as the middle position or the open end of the near radiator) means that the distance between the feeding point or the grounding branch and the position does not exceed a specific distance value, so as to constrain the positional relationship of "proximity". The examples in the above embodiments can be used as a way of implementation.

[0167] The open end and closed end mentioned in the above embodiments are, for example, relative to the ground, the closed end is grounded and the open end is not grounded, or are, for example, relative to other conductors, the closed end is electrically connected to other conductors and the open end is not electrically connected to other conductors.

[0168] In addition, the limitations on position and distance such as the middle or middle position mentioned in the above content of this application are all based on the current technological level, rather than being absolutely strict definitions in a mathematical sense. For example, the middle position of a conductor refers to the midpoint of the conductor. In practical applications, it means that the connection between other components (such as feeders, grounding branches) and the conductor covers the midpoint. The middle position of a slot or the middle position of one side of a slot refers to the midpoint of one side of the slot. In practical applications, it means that the connection between other components (such as feeders) and the side covers the midpoint. A gap is set in the middle position of one side of the slot. In practical applications, it means that the gap covers the midpoint of the side at the position of the gap on that side.

[0169] The feeding point mentioned in the above content of this application can refer to any point in the connection area (also called the connection point) between the feed line and the conductor, such as the center point. The distance from a point (such as a feeding point, a connection point, a grounding point) to a gap or from a gap to a point can refer to the distance from a point to the midpoint of the gap, or the distance from a point to both ends of the gap.

[0170] The current unidirectional / reverse distribution mentioned in the above content of this application should be understood as the direction of the main current on the conductor on the same side is unidirectional / reverse. For example, when unidirectional distributed current is excited on a ring-shaped conductor (for example, the current path is also ring-shaped), it should be understood that the main current excited on the conductors on both sides of the ring-shaped conductor (for example, the conductors on both sides of a gap surrounding a gap) is opposite in direction, which still falls within the definition of unidirectional distributed current in this application.

[0171] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. An electronic device, characterized in that: include: A first device body, a second device body and a rotating shaft, wherein the first device body and the second device body are connected by the rotating shaft; The electronic device can be folded at the rotating shaft; The electronic device further comprises: a first antenna disposed on the first device body and a second antenna disposed on the second device body, wherein the first antenna and the second antenna at least partially overlap when the electronic device is in a folded state, wherein: The first antenna comprises a first strip conductor and a first feeding point arranged on the first conductor, the first conductor is open at both ends, the distance from the first feeding point to the middle position of the first conductor is greater than or equal to zero and less than 1 / 16 of the working wavelength of the first antenna, or the distance from the first feeding point to an open end of the first conductor is greater than or equal to zero and less than 1 / 16 of the working wavelength of the first antenna; the first conductor is a section of a metal frame on the main body of the first device; The second antenna includes a strip-shaped second conductor and a second feeding point and a grounding branch arranged on the second conductor. The second conductor is open at both ends, and the second conductor is grounded through the grounding branch at its middle position. The distance from the second feeding point to the connection point between the second conductor and the grounding branch is greater than zero and less than 1 / 8 of the working wavelength of the second antenna, or the distance from the second feeding point to an open end of the second conductor is greater than or equal to zero and less than 1 / 8 of the working wavelength of the second antenna; the second conductor is a section of a metal frame on the second device body; the grounding branch is a strip-shaped floor portion connected to the second conductor formed by hollowing out the PCB floor of the second device body, and the connection between the grounding branch and the second conductor covers the middle position of the second conductor.

2. The electronic device according to claim 1, wherein: The current on the first conductor is distributed in the same direction, and the current on the second conductor is distributed in a symmetrical opposite direction.

3. The electronic device according to claim 2, characterized in that: The first feeding point on the first conductor and the second feeding point on the second conductor are staggered in position when the electronic device is in a folded state.

4. The electronic device according to any one of claims 1 to 3, characterized in that: The first antenna and the second antenna at least partially overlap when the electronic device is in a folded state, including: the projections of the first antenna and the second antenna on the plane where the first device body is located, or the projections on the plane where the second device body is located, partially overlap or completely overlap.

5. The electronic device according to claim 4, characterized in that: The first conductor is a strip conductor formed by a metal frame of the first device body, the first conductor is separated from the PCB floor of the first device body by a first groove, the first groove is formed by hollowing out the PCB floor of the first device body, and the first groove is adjacent to the first conductor; The first conductor is not grounded.

6. The electronic device according to claim 5, characterized in that: The second conductor is a strip conductor formed by the metal frame of the second device body. The second conductor is separated from the PCB floor of the second device body by a second groove and connected through the grounding branch. The second groove is formed by hollowing out the PCB floor of the second device body. The second groove is adjacent to the second conductor.

7. An electronic device, characterized in that: include: A first device body, a second device body and a rotating shaft, wherein the first device body and the second device body are connected by the rotating shaft; The electronic device can be folded at the rotating shaft; The electronic device further comprises: a first antenna disposed on the first device body and a second antenna disposed on the second device body, wherein the first antenna and the second antenna at least partially overlap when the electronic device is in a folded state, wherein: The first antenna comprises a first strip conductor and a first feeding point arranged on the first conductor, the first conductor is open at both ends, the distance from the first feeding point to the middle position of the first conductor is greater than or equal to zero and less than 1 / 16 of the working wavelength of the first antenna, or the distance from the first feeding point to an open end of the first conductor is greater than or equal to zero and less than 1 / 16 of the working wavelength of the first antenna; the first conductor is a section of a metal frame on the main body of the first device; The second antenna is an inverted F antenna, including a strip-shaped second conductor and a second feeding point and a grounding branch arranged on the second conductor, one end of the second conductor is open, and the other end of the second conductor is grounded through the grounding branch, the distance from the second feeding point to the connection point between the second conductor and the grounding branch is greater than zero and less than 1 / 8 of the working wavelength of the second antenna, or the distance from the second feeding point to an open end of the second conductor is greater than or equal to zero and less than 1 / 8 of the working wavelength of the second antenna; the second conductor is a section of metal frame on the second device body; the length of the second conductor is less than the length of the first conductor; the grounding branch is a strip-shaped floor portion connected to the second conductor formed by hollowing out the PCB floor of the second device body.

8. The electronic device according to claim 7, characterized in that: The first antenna and the second antenna at least partially overlap when the electronic device is in a folded state, including: the projections of the first antenna and the second antenna on the plane where the first device body is located, or the projections on the plane where the second device body is located, partially overlap or completely overlap.

9. The electronic device according to any one of claims 7 to 8, characterized in that: The first conductor is a strip conductor formed by a metal frame of the first device body, the first conductor is separated from the PCB floor of the first device body by a first groove, the first groove is formed by hollowing out the PCB floor of the first device body, and the first groove is adjacent to the first conductor; The first conductor is not grounded.

10. The electronic device according to claim 9, characterized in that: The second conductor is a strip conductor formed by the metal frame of the second device body. The second conductor is separated from the PCB floor of the second device body by a second groove and connected through the grounding branch. The second groove is formed by hollowing out the PCB floor of the second device body. The second groove is adjacent to the second conductor.

11. An electronic device, characterized in that: include: A first device body, a second device body and a rotating shaft, wherein the first device body and the second device body are connected by the rotating shaft; The electronic device can be folded at the rotating shaft; The electronic device further comprises: a first antenna disposed on the first device body and a second antenna disposed on the second device body, wherein the first antenna and the second antenna at least partially overlap when the electronic device is in a folded state, wherein: The first antenna comprises a first strip conductor and a first feeding point arranged on the first conductor, the first conductor is open at both ends, the distance from the first feeding point to the middle position of the first conductor is greater than or equal to zero and less than 1 / 16 of the working wavelength of the first antenna, or the distance from the first feeding point to an open end of the first conductor is greater than or equal to zero and less than 1 / 16 of the working wavelength of the first antenna; the first conductor is a section of a metal frame on the main body of the first device; The second antenna includes a second conductor with a first slot, both ends of the first slot are closed and grounded, a first slot is provided on a first side of the first slot, a distance from the first slot to a middle position of the first side is less than 1 / 16 of the working wavelength of the second antenna, a second feeding point is provided on the first side of the first slot, a distance from the second feeding point to the first slot is greater than zero and less than 1 / 8 of the working wavelength of the second antenna; the second conductor includes a metal frame of the second device body and a PCB floor of the second device body that enclose the first slot, the first slot is formed by hollowing out the PCB floor of the second device body, and the first slot is adjacent to the metal frame of the second device body.

12. The electronic device according to claim 11, characterized in that: The first antenna and the second antenna at least partially overlap when the electronic device is in a folded state, including: the projections of the first antenna and the second antenna on the plane where the first device body is located, or the projections on the plane where the second device body is located, partially overlap or completely overlap.

13. The electronic device according to any one of claims 11 to 12, characterized in that: The first conductor is a strip conductor formed by a metal frame of the first device body, the first conductor is separated from the PCB floor of the first device body by a second groove, the second groove is formed by hollowing out the PCB floor of the first device body, and the second groove is adjacent to the first conductor; The first conductor is not grounded.

14. The electronic device according to claim 13, characterized in that: The first gap is a gap opened on the metal frame of the second device body adjacent to the first groove and forming the first side of the first groove; on the metal frame, the first gap is opened on one side of the second feeding point, and no gap is opened on the other side of the second feeding point.

15. An electronic device, characterized in that: include: A first device body, a second device body and a rotating shaft, wherein the first device body and the second device body are connected by the rotating shaft; The electronic device can be folded at the rotating shaft; The electronic device further comprises: a first antenna disposed on the first device body and a second antenna disposed on the second device body, wherein the first antenna and the second antenna at least partially overlap when the electronic device is in a folded state, wherein: The first antenna includes a strip-shaped first conductor and a first feeding point and a grounding branch arranged on the first conductor, the first conductor is open at both ends, the grounding branch connects the first conductor and the ground at the middle position of the first conductor, the distance from the first feeding point to the connection point of the first conductor and the grounding branch is greater than zero and less than 1 / 8 of the working wavelength of the first antenna, or the distance from the first feeding point to an open end of the first conductor is greater than or equal to zero and less than 1 / 8 of the working wavelength of the first antenna; the first conductor is a section of a metal frame on the first device body; the grounding branch is a strip-shaped floor portion connected to the first conductor formed by hollowing out the PCB floor of the first device body, and the connection between the grounding branch and the first conductor covers the middle position of the first conductor; The second antenna includes a second conductor with a first slot, both ends of the first slot are closed and grounded, a second feeding point is provided on the first side of the first slot, and a distance from the second feeding point to the middle position of the first side of the first slot is greater than or equal to zero and less than 1 / 16 of the working wavelength of the second antenna; the second conductor includes a metal frame of the second device body and a PCB floor of the second device body that enclose the first slot, the first slot is formed by hollowing out the PCB floor of the second device body, and the first slot is adjacent to the metal frame of the second device body.

16. The electronic device according to claim 15, characterized in that: The first antenna and the second antenna at least partially overlap when the electronic device is in a folded state, including: the projections of the first antenna and the second antenna on the plane where the first device body is located, or the projections on the plane where the second device body is located, partially overlap or completely overlap.

17. The electronic device according to any one of claims 15 to 16, characterized in that: The first conductor is a strip conductor arranged on the frame of the first device body. The first conductor is separated from the PCB floor of the first device body by a second groove and connected through the grounding branch. The second groove is formed by hollowing out the PCB floor of the first device body, and the second groove is adjacent to the first conductor.

18. The electronic device according to claim 17, characterized in that: The metal frame of the second device body adjacent to the first groove and forming the first side of the first groove has no gap.

19. An electronic device, characterized in that: include: A first device body, a second device body and a rotating shaft, wherein the first device body and the second device body are connected by the rotating shaft; The electronic device can be folded at the rotating shaft; The electronic device further comprises: a first antenna disposed on the first device body and a second antenna disposed on the second device body, wherein the first antenna and the second antenna at least partially overlap when the electronic device is in a folded state, wherein: The first antenna includes a first conductor with a first slot, both ends of the first slot are closed and grounded, a first feeding point is provided on a first side of the first slot, and a distance from the first feeding point to a middle position of the first side of the first slot is greater than or equal to zero and less than 1 / 16 of a working wavelength of the first antenna; the first conductor includes a metal frame of the first device body and a PCB floor of the first device body that enclose the first slot, the first slot is formed by hollowing out the PCB floor of the first device body, and the first slot is adjacent to the metal frame of the first device body; The second antenna is an inverted F antenna, including a strip-shaped second conductor, a second feeding point and a grounding branch arranged on the second conductor, one end of the second conductor is open, and the other end of the second conductor is grounded through the grounding branch, the distance from the second feeding point to the connection point between the second conductor and the grounding branch is greater than zero and less than 1 / 8 of the working wavelength of the second antenna, or the distance from the second feeding point to an open end of the second conductor is greater than or equal to zero and less than 1 / 8 of the working wavelength of the second antenna; the second conductor is a section of a metal frame on the second device body; the grounding branch is a strip-shaped floor portion connected to the second conductor formed by hollowing out the PCB floor of the second device body.

20. The electronic device according to claim 19, characterized in that The first antenna and the second antenna at least partially overlap when the electronic device is in a folded state, including: the projections of the first antenna and the second antenna on the plane where the first device body is located, or the projections on the plane where the second device body is located, partially overlap or completely overlap.

21. The electronic device according to any one of claims 19 to 20, characterized in that: The second conductor is a strip conductor formed by the metal frame of the second device body. The second conductor is separated from the PCB floor of the second device body by a second groove and connected through the grounding branch. The second groove is formed by hollowing out the PCB floor of the second device body. The second groove is adjacent to the second conductor.

22. The electronic device according to claim 21, characterized in that There is no gap on the metal frame of the first device body adjacent to the first groove and forming the first side of the first groove.

23. An electronic device, characterized in that: include: A first device body, a second device body and a rotating shaft, wherein the first device body and the second device body are connected by the rotating shaft; The electronic device can be folded at the rotating shaft; The electronic device further comprises: a first antenna disposed on the first device body and a second antenna disposed on the second device body, wherein the first antenna and the second antenna at least partially overlap when the electronic device is in a folded state, wherein: The first antenna includes a first conductor with a first slot, both ends of the first slot are closed and grounded, a first slot is provided on a first side of the first slot, a distance from the first slot to a middle position of the first side is less than 1 / 16 of an operating wavelength of the second antenna, a first feeding point is provided on the first side of the first slot, a distance from the first feeding point to the first slot is greater than zero and less than 1 / 8 of an operating wavelength of the first antenna; the first conductor includes a metal frame of the first device body and a PCB floor of the first device body that enclose the first slot, the first slot is formed by hollowing out the PCB floor of the first device body, and the first slot is adjacent to the metal frame of the first device body; The second antenna includes a second conductor with a second slot, both ends of the second slot are closed and grounded, a second feeding point is provided on the second side of the second slot, and a distance from the second feeding point to a middle position of the second side of the second slot is greater than or equal to zero and less than 1 / 16 of the working wavelength of the second antenna; the second conductor includes a metal frame of the second device body and a PCB floor of the second device body that enclose the second slot, the second slot is formed by hollowing out the PCB floor of the second device body, and the second slot is adjacent to the metal frame of the second device body.

24. The electronic device according to claim 23, characterized in that The first antenna and the second antenna at least partially overlap when the electronic device is in a folded state, including: the projections of the first antenna and the second antenna on the plane where the first device body is located, or the projections on the plane where the second device body is located, partially overlap or completely overlap.

25. The electronic device according to any one of claims 23 to 24, characterized in that: There is no gap on the metal frame of the second device body adjacent to the second groove and forming the first side of the second groove.

26. The electronic device according to claim 25, characterized in that The first gap is a gap opened on the metal frame of the first device body on the first side of the first slot; on the metal frame of the first device body, the first gap is opened on one side of the first feeding point, and no gap is opened on the other side of the first feeding point.

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