Foldable electronic equipment

Abstract

The embodiment of the invention provides foldable electronic equipment which comprises a foldable first shell and a foldable second shell, and part of frames of the first shell and the second shell are used as a first radiator and a second radiator of an antenna respectively. When the foldable electronic device is in a folded state, the first radiator is coupled with the second radiator, so that the second radiator serves as a parasitic branch knot of the first radiator and works together with the first radiator. The length of the second radiator is set to be greater than the length of the first radiator, so that the radiation capability of the second radiator is further improved, the radiation capability of energy which is coupled and transmitted to the second radiator by the first radiator is improved, and the radiation efficiency of the first radiator is improved. According to the technical scheme, the antenna performance of the foldable electronic equipment in a folded state can be improved, so that the foldable electronic equipment has good radiation characteristics.

Description

A foldable electronic device

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on January 20, 2023, with application number 202310125196.6 and application name “A Foldable Electronic Device”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] Embodiments of the present application relate to the field of electronic devices, and more specifically, to a foldable electronic device. Background Art

[0003] Foldable electronic devices can switch between a folded state and an unfolded state. When folded, they occupy a relatively small space; when unfolded, they can display a relatively large screen, increasing the user's viewing area. Foldable electronic devices have become a major trend in current technological development.

[0004] However, when a foldable electronic device is in the folded state, the antenna performance of the traditional antenna architecture is significantly reduced compared to the unfolded state, resulting in poor antenna performance. Therefore, how to improve the antenna performance of foldable electronic devices in the folded state is an urgent problem that needs to be solved.

[0005] Summary of the Invention

[0006] An embodiment of the present application provides a foldable electronic device, the purpose of which is to improve the antenna performance of the foldable electronic device when it is in a folded state.

[0007] In a first aspect, a foldable electronic device is provided, comprising: a first shell and a second shell, the first shell comprising a first frame, the second shell comprising a second frame; a rotating shaft, the rotating shaft being located between the first shell and the second shell, the rotating shaft being rotatably connected to the first shell and the second shell respectively; an antenna, the antenna comprising a first radiator and a second radiator, the first radiator comprising a portion of the first frame, the second radiator comprising a portion of the second frame, wherein the first radiator is provided with a feeding point for feeding the antenna, and the length of the second radiator is greater than the length of the first radiator; when the foldable electronic device is in a folded state, in a thickness direction of the foldable device, the first radiator and the second radiator are arranged relative to each other at a first interval, and at least a portion of the first radiator overlaps with the second radiator, so that the first radiator and the second radiator are coupled.

[0008] In the above technical solution, when the first radiator is operating, the RF energy of the first radiator can be transferred to the second radiator through coupling, stimulating the second radiator to generate radiation, causing it to act as a parasitic branch and operate in conjunction with the first radiator. At the same time, by setting the length of the second radiator to be greater than that of the first radiator, the radiation capability of the second radiator is further improved, thereby improving the radiation capability of the RF energy coupled and transferred from the first radiator to the second radiator. This can improve the radiation efficiency of the first radiator, expand the operating bandwidth of the antenna, and help reduce the adverse effects on antenna performance caused by the reduced floor size or overlapping coverage of the shell in the folded state, thereby improving the antenna performance of the foldable electronic device in the folded state and giving it good radiation characteristics.

[0009] In conjunction with the first aspect, in certain implementations of the first aspect, the length L1 of the first radiator and the length L2 of the second radiator satisfy the condition: L2 ≥ 1.5 L1. This ensures that increasing the length of the second radiator improves the radiation efficiency of the first radiator. For example, when L2 > 1.5 L1, the radiation efficiency can be improved by approximately 1 dB compared to the condition where L2 ≤ L1.

[0010] In combination with the first aspect, in certain implementations of the first aspect, the first radiator includes a first end and a second end, the first end is grounded, and the feeding point is located at a position of the first radiator close to the second end; the second radiator includes a third end and a fourth end, and the third end is grounded.

[0011] In the above technical solution, since the second radiator, acting as a parasitic branch, is grounded, when the foldable electronic device is folded, the first and second radiators couple, effectively utilizing the floor current to generate radiation. In this case, the electrical length of the second radiator can be one-quarter of its operating wavelength, meaning that the second radiator functions as a quarter-wavelength antenna.

[0012] In combination with the first aspect, in some implementations of the first aspect, the foldable electronic device also includes a switching circuit, the second radiator is provided with a connection point, the connection point is located at a position of the second radiator close to the fourth end, one end of the switching circuit is grounded, and the other end of the switching circuit is connected to the connection point for adjusting the resonant frequency of the second radiator.

[0013] In the above technical solution, the resonant frequency of the second radiator serving as a parasitic branch can be adjusted by setting a switching circuit, so that the antenna can cover different frequency bands, which is conducive to meeting communication needs.

[0014] In combination with the first aspect, in some implementations of the first aspect, the distance D1 between the connection point and the fourth end satisfies: 1 / 3L2≤D1≤1 / 2L2, where L2 is the length of the second radiator, thereby better meeting the coupling requirements of the first radiator and the second radiator.

[0015] In combination with the first aspect, in certain implementations of the first aspect, the switching circuit includes a switching device and multiple matching branches of a parallel device, one end of the switching device is grounded, the other end of the switching device is connected to the multiple matching branches, the other end of the multiple matching branches is connected to the connection point, and the switching device switches between the multiple matching branches to adjust the resonant frequency of the second radiator.

[0016] In combination with the first aspect, in certain implementations of the first aspect, the first frame has a first position and a second position, and the second frame has a third position and a fourth position; the first radiator includes a first frame between the first position and the second position; and the second radiator includes a second frame between the third position and the fourth position.

[0017] In combination with the first aspect, in certain implementations of the first aspect, the first frame includes a first side and a second side that intersect at an angle, and the first side is parallel to the extension direction of the rotating axis; wherein the first position and the second position are located on the first side; or, the first position and the second position are located on the second side.

[0018] It is understandable that the position of the first radiator in the foldable electronic device can be flexibly adjusted according to actual production and design requirements. For example, the first radiator can be located on the long side or wide side of the foldable electronic device.

[0019] In combination with the first aspect, in certain implementations of the first aspect, the second frame includes a third side and a fourth side that intersect at an angle, and the third side is parallel to the extension direction of the rotating shaft; wherein the third position and the fourth position are located on the third side; or, the third position and the fourth position are located on the fourth side; or, the third position is located on the third side, and the fourth position is located on the fourth side.

[0020] It can be understood that based on the position of the first radiator in the foldable electronic device, the position of the second radiator in the foldable electronic device can be flexibly adjusted according to actual production and design requirements. For example, the second radiator can be located on the long side, wide side, or both the long side and wide side of the foldable electronic device.

[0021] In combination with the first aspect, in some implementations of the first aspect, the first position is located in an overlapping area between the first side and the second side, and the third position is located in an overlapping area between the third side and the fourth side.

[0022] It is understandable that one end of the first radiator and the second radiator may also be located at a corner of the foldable electronic device.

[0023] In combination with the first aspect, in certain implementations of the first aspect, when the foldable device is in a folded state, the length L3 of the overlapping portion between the first radiator and the second radiator satisfies: L3>1 / 2L1, where L1 is the length of the first radiator, thereby facilitating ensuring the coupling strength between the first radiator and the second radiator. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] FIG1 is a schematic structural diagram of a foldable electronic device 100 provided in an embodiment of the present application.

[0025] FIG2 is a schematic structural diagram of the foldable electronic device 100 in an outwardly folded state.

[0026] FIG3 is a schematic structural diagram of a foldable electronic device in an unfolded state provided by an embodiment of the present application.

[0027] FIG4 is a schematic structural diagram of a foldable electronic device in a folded state provided by an embodiment of the present application.

[0028] FIG5 shows a schematic structural diagram of a foldable electronic device in a folded state.

[0029] FIG6 shows a schematic structural diagram of another foldable electronic device in a folded state.

[0030] FIG. 7 is a scalar distribution diagram of the local magnetic field of the antenna when the foldable electronic device shown in FIG. 4 is in a folded state.

[0031] FIG8 is a vector distribution diagram of the local magnetic field of the antenna when the foldable electronic device shown in FIG4 is in a folded state.

[0032] FIG9 is a diagram showing simulation results of the system efficiency and radiation efficiency of the antenna when the foldable electronic device shown in FIG4 and FIG5 is in a folded state.

[0033] FIG10 is a schematic diagram of the current distribution structure at the position of the second radiator 242 when the foldable electronic device shown in FIG4 and FIG6 is in the folded state.

[0034] FIG11 is a diagram showing simulation results of the system efficiency and radiation efficiency of the antenna when the foldable electronic device shown in FIG4 and FIG6 is in a folded state.

[0035] FIG12 is a schematic structural diagram of another foldable electronic device provided in an embodiment of the present application when in a folded state.

[0036] FIG13 is a schematic structural diagram of a foldable electronic device in a folded state provided by an embodiment of the present application.

[0037] FIG14 is a diagram showing simulation results of the system efficiency and radiation efficiency of the antenna when the foldable electronic device shown in FIG13 and FIG5 is in a folded state.

[0038] FIG15 is a schematic structural diagram of another foldable electronic device provided in an embodiment of the present application when in a folded state.

[0039] FIG16 is a diagram showing simulation results of the system efficiency and radiation efficiency of the antenna when the foldable electronic device shown in FIG15 and FIG5 is in a folded state.

[0040] FIG17 is a schematic structural diagram of another foldable electronic device provided in an embodiment of the present application when in a folded state.

[0041] FIG18 is a diagram showing simulation results of the system efficiency and radiation efficiency of the antenna when the foldable electronic device shown in FIG17 and FIG5 is in a folded state.

[0042] FIG19 is a diagram showing simulation results of the S parameters of the antenna when the foldable electronic device shown in FIG17 and FIG5 is in a folded state.

[0043] FIG20 is a schematic structural diagram of another foldable electronic device provided in an embodiment of the present application when in a folded state.

[0044] FIG21 is a schematic structural diagram of another foldable electronic device provided in an embodiment of the present application when in a folded state.

[0045] FIG22 is a schematic structural diagram of another foldable electronic device provided in an embodiment of the present application when in a folded state. DETAILED DESCRIPTION

[0046] The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings.

[0047] For ease of understanding, the technical terms involved in the embodiments of this application are explained and described below.

[0048] Coupling: can be understood as direct coupling and / or indirect coupling, and "coupling connection" can be understood as direct coupling connection and / or indirect coupling connection. Direct coupling can also be referred to as "electrical connection", which is understood as the physical contact and electrical conduction between components; it can also be understood as the form in which different components in the circuit structure are connected through physical lines such as printed circuit board (PCB) copper foil or wires that can transmit electrical signals; "indirect coupling" can be understood as two conductors being electrically conductive in an airless / non-contact manner. In one embodiment, indirect coupling can also be referred to as capacitive coupling, for example, signal transmission is achieved by forming an equivalent capacitance through coupling between the gap between two conductive parts.

[0049] Connection / connected: can refer to a mechanical connection relationship or a physical connection relationship. For example, A and B are connected or A and B are connected can mean that there is a fastening component (such as a bolt, rivet, etc.) between A and B, or A and B are in contact with each other and A and B are difficult to separate.

[0050] Resonance / Resonant Frequency: Resonant frequency is also called resonant frequency. It refers to the frequency at which the imaginary part of the antenna's input impedance is zero. Resonant frequency can have a frequency range, i.e., the frequency range in which resonance occurs. The frequency corresponding to the strongest resonance is the center frequency. The return loss characteristic at the center frequency can be less than -20dB.

[0051] Resonance frequency band / communication frequency band / operating frequency band: Regardless of the type of antenna, it always operates within a certain frequency range (bandwidth). For example, an antenna that supports the B40 frequency band operates between 2300MHz and 2400MHz, or in other words, the antenna's operating frequency band includes the B40 frequency band. The frequency range that meets the required specifications can be considered the antenna's operating frequency band.

[0052] The limitations such as symmetry (for example, axisymmetry, or central symmetry, etc.), parallelism, perpendicularity, and sameness (for example, same length, same width, etc.) mentioned in the embodiments of the present application are all for the current level of technology, rather than being absolutely strict definitions in a mathematical sense. There may be a deviation of a predetermined angle between the two mutually parallel or perpendicular ones. In one embodiment, the predetermined threshold value may be less than or equal to a threshold value of 1 mm, for example, the predetermined threshold value may be 0.5 mm, or may be 0.1 mm. In one embodiment, the predetermined angle may be an angle within the range of ±10°, for example, the predetermined angle deviation may be ±5°.

[0053] Antenna pattern: Also known as radiation pattern. It is a graph showing how the relative field strength (normalized modulus) of the antenna's radiation field changes with direction at a certain distance from the antenna. It is usually represented by two mutually perpendicular plane patterns passing through the antenna's direction of maximum radiation.

[0054] Antenna patterns typically have multiple radiation beams. The beam with the strongest radiation intensity is called the main lobe, while the remaining beams are called side lobes. Among the side lobes, those in the opposite direction of the main lobe are also called back lobes.

[0055] Antenna system efficiency (total efficiency): refers to the ratio of input power to output power at the antenna port.

[0056] Antenna radiation efficiency refers to the ratio of the power radiated into space by an antenna (i.e., the power effectively converted into electromagnetic waves) to the active power input to the antenna. Active power input to the antenna = antenna input power - power loss; power loss primarily includes return loss and metal ohmic loss and / or dielectric loss. Radiation efficiency measures the antenna's radiation capability, with metal loss and dielectric loss influencing the efficiency.

[0057] It should be understood that efficiency is generally expressed as a percentage, and there is a corresponding conversion relationship between efficiency and dB. The closer the efficiency is to 0 dB, the better the efficiency of the antenna.

[0058] Antenna return loss: This can be understood as the ratio of the signal power reflected back to the antenna port by the antenna circuit to the antenna port's transmitted power. The smaller the reflected signal, the larger the signal radiated from the antenna into space, and the greater the antenna's radiation efficiency. The larger the reflected signal, the smaller the signal radiated from the antenna into space, and the lower the antenna's radiation efficiency.

[0059] Antenna return loss can be expressed using the S11 parameter, a type of S parameter. S11 represents the reflection coefficient and characterizes the antenna's transmission efficiency. The S11 parameter is typically negative. A smaller S11 parameter indicates lower antenna return loss and less energy reflected back from the antenna itself, meaning more energy actually enters the antenna and higher system efficiency. A larger S11 parameter indicates greater antenna return loss and lower system efficiency.

[0060] It should be noted that in engineering, an S11 value of -6dB is generally used as a standard. When the S11 value of an antenna is less than -6dB, it can be considered that the antenna can work normally, or the antenna can be considered to have good transmission efficiency.

[0061] Ground, or floor: can generally refer to at least a part of any grounding layer, or grounding plate, or grounding metal layer, etc. in an electronic device (such as a mobile phone), or at least a part of any combination of any of the above grounding layers, or grounding plates, or grounding components, etc. "Ground" can be used for grounding components in an electronic device. In one embodiment, the "ground" can be the grounding layer of a circuit board of an electronic device, or it can be the grounding plate formed by the middle frame of the electronic device or the grounding metal layer formed by the metal film under the screen. In one embodiment, the circuit board can be a printed circuit board (PCB), such as an 8-layer, 10-layer, or 12-layer to 14-layer board having 8, 10, 12, 13 or 14 layers of conductive material, or an element separated and electrically insulated by a dielectric layer or insulating layer such as glass fiber, polymer, etc.

[0062] Any of the above-mentioned grounding layers, grounding plates, or grounding metal layers are made of a conductive material. In one embodiment, the conductive material can be any of the following materials: copper, aluminum, stainless steel, brass, and alloys thereof; copper foil on an insulating substrate; aluminum foil on an insulating substrate; gold foil on an insulating substrate; silver-plated copper; silver-plated copper foil on an insulating substrate; silver foil and tin-plated copper on an insulating substrate; cloth impregnated with graphite powder; graphite-coated substrates; copper-plated substrates; brass-plated substrates; and aluminum-plated substrates. Those skilled in the art will appreciate that the grounding layer / grounding plate / grounding metal layer can also be made of other conductive materials.

[0063] The technical solutions provided in the embodiments of the present application are applicable to foldable electronic devices that use one or more of the following communication technologies: Bluetooth (BT) communication technology, global positioning system (GPS) communication technology, wireless fidelity (WiFi) communication technology, global system for mobile communications (GSM) communication technology, wideband code division multiple access (WCDMA) communication technology, long term evolution (LTE) communication technology, 5G communication technology, and other future communication technologies. The following embodiments do not highlight the requirements of the communication network, but only illustrate the working characteristics of the antenna based on the frequency band.

[0064] Figure 1 is a schematic diagram of the structure of a foldable electronic device 100 provided in an embodiment of the present application. Foldable electronic device 100 can be a mobile phone, tablet computer, watch, e-reader, laptop computer, wearable device, or other electronic device with folding functionality. The embodiment shown in Figure 1 is described using a foldable mobile phone as an example.

[0065] 1 , a foldable electronic device 100 may include a flexible display 110, a first frame 121, a first cover 122, a second frame 123, a second cover 124, and a hinge 125. In some embodiments, the first frame 121, the first cover 122, the second frame 123, and the second cover 124 may form a first housing 126 and a second housing 127 that support the flexible display 110. In other embodiments, at least one of the first cover 122 and the second cover 124 may be a display.

[0066] The dot matrix pattern filled in FIG1 schematically represents the flexible display screen 110. The flexible display screen 110 can have the characteristics of strong flexibility and bendability, thereby providing users with a new interaction method based on its bendable characteristics. The display panel of the flexible display screen 110 can adopt, for example, any one of a liquid crystal display (LCD), an organic light-emitting diode (OLED), an active-matrix organic light-emitting diode or an active-matrix organic light-emitting diode (AMOLED), a flexible light-emitting diode (FLED), a quantum dot light-emitting diode (QLED), etc., without limitation.

[0067] The flexible display screen 110 may include a first display portion 111 corresponding to the first housing 126 , a second display portion 112 corresponding to the second housing 127 , and a foldable display portion 113 corresponding to the hinge 125 . The foldable display portion 113 is connected between the first display portion 111 and the second display portion 112 .

[0068] The first frame 121 can surround the outer periphery of the first cover 122, and at least a portion of the first frame 121 can also surround the outer periphery of the first display portion 111. The first display portion 111 and the first cover 122 can be located on either side of the first frame 120, and the first display portion 111 and the first cover 122 can be arranged parallel to each other and spaced apart. The space between the first display portion 111 and the first cover 122 can be used to accommodate components of the foldable electronic device 100, such as antennas and circuit board components.

[0069] The second frame 123 can surround the outer periphery of the second cover 124, and at least a portion of the second frame 123 can also surround the outer periphery of the second display portion 112. The second display portion 112 and the second cover 124 can be located on either side of the second frame 123, and the second display portion 112 and the second cover 124 can be arranged parallel to each other and spaced apart. The space between the second display portion 112 and the second cover 124 can be used to accommodate components of the foldable electronic device 100, such as antennas and circuit board components.

[0070] In some embodiments provided herein, the cover and the frame may be two parts of the housing of the foldable electronic device 100, and the cover and the frame are connected, and the form of the connection may include but is not limited to assembly methods such as snap-on, gluing, welding, riveting, and clearance fit. The connection between the cover and the frame is usually difficult to separate. In other embodiments provided herein, the cover and the frame may be two different components, and by assembling the cover and the frame together, the housing of the foldable electronic device 100 can be formed.

[0071] The hinge 125 can be connected between the first housing 126 and the second housing 127. The hinge 125 can move the first housing 126 and the second housing 127 closer to or farther from each other. Accordingly, the first display portion 111 of the flexible display 110 and the second display portion 112 of the flexible display 110 can move closer to or farther from each other, allowing the flexible display 110 to be folded or unfolded.

[0072] In one example, the rotating shaft 125 may include a main shaft, a first connecting component, and a second connecting component. The first connecting component may be fixed to the first cover 122, and the second connecting component may be fixed to the second cover 124. The first and second connecting components are rotatable relative to the main shaft. The mutual movement of the first and second connecting components can drive the mutual movement of the first and second housings 126 and 127, thereby realizing the opening and closing function of the foldable electronic device 100.

[0073] It should be understood that in some embodiments, the first housing 126 may be the housing on the side where the main screen of the foldable electronic device 100 is located, and the second housing 127 may be the housing on the side where the secondary screen of the foldable electronic device 100 is located. In other embodiments, the first housing 126 may be the housing on the side where the secondary screen of the foldable electronic device 100 is located, and the second housing 127 may be the housing on the side where the main screen of the foldable electronic device 100 is located, and this application is not limited to this. For ease of description and understanding, the embodiments of this application are described as follows: the first housing 126 is the housing on the side where the main screen of the foldable electronic device 100 is located, and the second housing 127 is the housing on the side where the secondary screen of the foldable electronic device 100 is located.

[0074] The foldable electronic device 100 shown in FIG1 is currently in an unfolded state. In the unfolded state, the angle between the first housing 126 and the second housing 127 can be approximately 180°. The flexible display 110 can be in the unfolded state as shown in FIG1 .

[0075] FIG2 illustrates a possible folded state of the foldable electronic device 100. FIG2 illustrates the foldable electronic device 100 in an outwardly folded state (the outwardly folded state may be referred to as the outwardly folded state). The outwardly folded state illustrated in FIG2 may, for example, be a left-right outwardly folded state or a top-bottom outwardly folded state.

[0076] A possible folding state of the foldable electronic device 100 is described below with reference to FIG. 1 and FIG. 2 .

[0077] In the embodiments of the present application, the foldable electronic device 100 being in a folded state may mean that the foldable electronic device 100 is currently bent and the degree of bending of the foldable electronic device 100 has reached its maximum. In this case, the first cover 122 and the second cover 124 may be parallel to each other, spaced apart from each other, and disposed face to face, with the spacing between the first cover 122 and the second cover 124 being minimized, and at least portions of the first housing 126 and the second housing 127 being housed within the space enclosed by the flexible display 110; the first display portion 111, the first housing 126, the second housing 127, and the second display portion 112 are sequentially stacked. Similarly, the first display portion 111 and the second display portion 112 may be parallel to each other and spaced apart from each other, with the spacing between the first cover 122 and the second cover 124 being smaller than the spacing between the first display portion 111 and the second display portion 112. In this case, the first display portion 111 and the second display portion 112 may be considered to be located on different planes.

[0078] 1 and 2 , when the foldable electronic device 100 is in the outward folded state, the first cover 122 and the second cover 124 can be brought into close proximity, and the first display portion 111 and the second display portion 112 can be brought into close proximity. The first display portion 111, the second display portion 112, and the foldable display portion 123 can form a housing area for accommodating the first cover 122, the second cover 124, and the hinge 125. In other words, the first cover 122, the second cover 124, and the hinge 125 can be accommodated in the space between the first display portion 111 and the second display portion 112.

[0079] The foldable electronic device 100 can switch between a folded state and an unfolded state. When the foldable electronic device 100 is in the folded state, the space occupied by the foldable electronic device 100 is relatively small; when the foldable electronic device 100 is in the unfolded state, the foldable electronic device 100 can display a relatively large screen to increase the user's viewing range.

[0080] However, when the foldable electronic device 100 is in the folded state, on the one hand, the length (or area) of the floor of the foldable electronic device 100 is reduced by half compared to the unfolded state, which easily causes the environment around the antenna arranged in the foldable electronic device 100 to change, which may degrade the performance of the entire antenna system, resulting in a significant decrease in the performance of the antenna of the foldable electronic device 100 in the folded state compared to the unfolded state; on the other hand, the secondary screen side body will directly cover the main screen side body, for example, the second shell 127 directly covers the first shell 126, which makes the radiation environment of the main screen side antenna worse, resulting in a decrease in the efficiency of the antenna arranged on the main screen side, thereby causing the antenna performance of the foldable electronic device 100 in the folded state to be significantly decreased compared to the unfolded state, and the antenna performance is poor. Therefore, how to improve the antenna performance of the foldable electronic device 100 when it is in the folded state is an urgent problem to be solved.

[0081] Based on the above content, an embodiment of the present application provides a foldable electronic device, the purpose of which is to improve the antenna performance of the foldable electronic device when it is in a folded state.

[0082] Figures 3 and 4 are schematic diagrams of the structure of a foldable electronic device 200 provided in an embodiment of the present application. Figure 3 is a schematic diagram of the structure of the foldable electronic device 200 in an unfolded state, and Figure 4 is a schematic diagram of the structure of the foldable electronic device 200 in a folded state. It should be understood that the foldable electronic device 200 may be the foldable electronic device 100.

[0083] 3 and 4 together, the foldable electronic device 200 may include a first housing 210 , a second housing 220 , a hinge 230 , and an antenna 240 .

[0084] Among them, the rotating shaft 230 can be located between the first shell 210 and the second shell 220, and the rotating shaft 230 is rotatably connected to the first shell 210 and the second shell 220 respectively, so that the first shell 210 and the second shell 220 can rotate relative to each other along the rotating shaft 230, that is, so that the foldable electronic device 200 can switch between the unfolded state and the folded state.

[0085] It should be noted that the present application embodiment is described by taking the example of the first housing 210 being the housing on the side where the main screen of the foldable electronic device 200 is located, and the second housing 220 being the housing on the side where the secondary screen of the foldable electronic device 200 is located. In other embodiments, the first housing 210 may also be the housing on the side where the secondary screen of the foldable electronic device 200 is located, and the second housing 220 may be the housing on the side where the main screen of the foldable electronic device 200 is located, and this application does not limit this.

[0086] It should also be noted that the embodiment of the present application assumes that the extension direction of the rotating shaft 230 is parallel to the length direction (y-direction) of the foldable electronic device 200. In other words, the embodiment of the present application is described using the foldable electronic device 200 as a left-to-right flippable electronic device. In other embodiments, the extension direction of the rotating shaft 230 can be parallel to the width direction (x-direction) of the foldable electronic device 200. In other words, the foldable electronic device 200 can be a top-to-bottom flippable electronic device. This application does not limit this.

[0087] The first housing 210 may include a first frame 211 , and the second housing 220 may include a second frame 221 .

[0088] The antenna 240 may include a first radiator 241 and a second radiator 242. The first radiator 241 may include a portion of the first frame 211, and the second radiator 242 may include a portion of the second frame 221. In other words, the first radiator 241 is disposed on the first housing 210, and the second radiator 242 is disposed on the second housing 220.

[0089] Among them, a feeding point 2411 is provided on the first radiator 241 for feeding the antenna 240. For example, the feeding point 2411 can be connected to the RF source 250 of the foldable electronic device to receive the RF signal output by the RF source 250. In addition, the length L2 of the second radiator 242 can be greater than the length L1 of the first radiator 241, that is, L2>L1. For example, L2 can be equal to 1.2L1, 1.5L1, 1.7L1, 1.8L1, or 2L1, etc. It can be understood that the specific numerical relationship between L2 and L1 mentioned above is only an example and is not a limitation of this application. It can be adjusted according to actual production and design requirements.

[0090] When the foldable electronic device 200 is in a folded state, in the direction in which the first shell 210 and the second shell 220 are stacked, that is, in the thickness direction of the foldable electronic device 200 (z direction), the first radiator 241 and the second radiator 242 are arranged relative to each other with a first interval 243, and at least part of the first radiator 241 overlaps with the second radiator 242 so that the first radiator 241 and the second radiator 242 are coupled.

[0091] It should be noted that when the foldable electronic device 200 is in the folded state, the first radiator 241 and the second radiator 242 are arranged opposite each other, forming a coupling capacitor therebetween, thereby exciting the second radiator 242 to generate an excitation resonance signal. In other words, the second radiator 242 can act as a parasitic branch of the first radiator 241.

[0092] It will be appreciated that to ensure the coupling strength between the first radiator 241 and the second radiator 242, the size of the first distance 244 may depend on the overlap length / coupling length L3 of the first radiator 241 and the second radiator 242 in the folded state. For example, when the coupling length L3 between the first radiator 241 and the second radiator 242 is short, the size of the first distance 244 may be reduced to ensure the coupling strength.

[0093] In some embodiments, to further ensure coupling strength, when the foldable electronic device 200 is in the folded state, the coupling length L3 between the first radiator 241 and the second radiator 242 can be greater than 1 / 2 of the length L1 of the first radiator 241. It should be understood that the above range of the coupling length L3 between the first radiator 241 and the second radiator 242 is merely illustrative and can be adjusted based on actual production and design requirements. For example, in other embodiments, when the foldable electronic device 200 is in the folded state, L3 can also be less than or equal to 1 / 2 of the length L1 of the first radiator 241, and this application is not limited to this.

[0094] When the first radiator 241 is operating, the RF energy from the first radiator 241 can be transferred to the second radiator 242 through coupling, stimulating the second radiator 242 to generate radiation, causing it to function as a parasitic branch and operate in conjunction with the first radiator 241. Furthermore, by setting the length L2 of the second radiator 242 to be greater than the length L1 of the first radiator 241, the radiation capability of the second radiator 242 is further improved, thereby enhancing the radiation capability of the RF energy coupled and transferred from the first radiator 241 to the second radiator 242. This improves the radiation efficiency of the first radiator 241, expands the antenna's operating bandwidth, and mitigates the adverse effects on antenna performance caused by the reduced floor size or overlapping housings when folded. This improves the antenna performance of the foldable electronic device 200 when folded, resulting in excellent radiation characteristics.

[0095] In some embodiments, to further improve the radiation efficiency of the first radiator 241 and expand the working bandwidth of the antenna, the length L2 of the second radiator 242 and the length L1 of the first radiator 241 may satisfy: L2 ≥ 1.5L1.

[0096] In some embodiments provided herein, the first frame 211 may have a first position 2111 and a second position 2112 , wherein the first radiator 241 may include the first frame 211 between the first position 2111 and the second position 2112 .

[0097] In one example, the first radiator 241 may include a portion between the first position 2111 and the second position 2112 of the first frame 211, and this portion of the first frame 211 may be a conductive frame. In another example, the first radiator 241 may also include a conductive material (e.g., liquid crystal polymer) within the first frame 211 between the first position 2111 and the second position 2112, and this portion of the first frame 211 may be a non-conductive frame. The following embodiments may also be understood accordingly.

[0098] In some embodiments, the first frame 211 may include a first side 212 and a second side 213 that intersect at an angle. The first side 212 may be parallel to the extension direction of the rotation axis 230. In one example, the first position 2111 and the second position 2112 are both located on the first side 212; alternatively, the first position 2111 and the second position 2112 are both located on the second side 213. In other words, the first radiator 241 may be located on either the wide side (x-direction) or the long side (y-direction) of the first housing 210. In other words, the first radiator 241 is linear. In another example, the first position 2111 is located on the first side 212, and the second position 2112 is located on the second side 213; alternatively, the first position 2111 is located on the second side 213, and the second position 2112 is located on the first side 212. In other words, the first radiator 241 may be located on either the wide side (x-direction) or the long side (y-direction) of the first housing 210. In other words, the first radiator 241 is linear. The following embodiments can also be understood accordingly.

[0099] Furthermore, in some embodiments, the first position 2111 is located at the intersection of the first side 212 and the second side 213 ; or, the second position 2112 is located at the intersection of the first side 212 and the second side 213 .

[0100] It is understood that the first side 212 and the second side 213 may have an overlapping area. The overlapping area can be understood as the intersection area of ​​the first side 212 and the second side 213. When the intersection of the first side 212 and the second side 213 is arc-shaped, the arc-shaped frame can be understood as the overlapping area / intersection area of ​​the first side 212 and the second side 213. When the intersection of the first side 212 and the second side 213 is at a right angle, the overlapping area / intersection area of ​​the first side 212 and the second side 213 can be understood as the area within a first threshold (e.g., 3 mm) from the intersection. The following embodiments can also be understood accordingly.

[0101] In some embodiments provided herein, the second frame 221 may have a third position 2211 and a fourth position 2212 , wherein the second radiator 242 may include the second frame 221 between the third position 2211 and the fourth position 2212 .

[0102] In some embodiments, the second frame 221 may include a third side 222 and a fourth side 223 that intersect at an angle. The third side 222 may be parallel to the extension direction of the rotation axis 230. In one example, the third position 2211 and the fourth position 2212 are both located on the third side 222; alternatively, the third position 2211 and the fourth position 2212 are both located on the fourth side 223. In other words, the second radiator 242 may be located on either the wide side (x-direction) or the long side (y-direction) of the second housing 220. In another example, the third position 2211 is located on the third side 222, and the fourth position 2212 is located on the fourth side 223; alternatively, the third position 2211 is located on the fourth side 223, and the fourth position 2212 is located on the third side 222. In other words, the second radiator 242 may be located on either the wide side (x-direction) or the long side (y-direction) of the second housing 220.

[0103] Furthermore, in some embodiments, the third position 2211 is located at the intersection of the third side 222 and the fourth side 223 ; or, the fourth position 2212 is located at the intersection of the third side 222 and the fourth side 223 .

[0104] It can be understood that the embodiment of the present application does not impose any special restrictions on the position of the first radiator 241 in the first frame 211 and the position of the second radiator 242 in the second frame 221. As long as the first radiator 241 and the second radiator 242 can be coupled when in the folded state, and the length L2 of the second radiator 242 is greater than the length L1 of the first radiator 241, it is sufficient.

[0105] It is also understandable that the position layout of the first radiator 241 on the first frame 211 and the second radiator 242 on the second frame 221 will be described in more detail below with reference to the accompanying drawings, and is only briefly described here.

[0106] In some embodiments provided herein, the first radiator 241 may have a first end 2412 and a second end 2413. The first end 2412 may be a grounded end for grounding the first radiator 241, and the second end 2413 may be an open end that is not grounded. In one example, the feed point 2411 may be located near the second end 2413 of the first radiator 241 and connected to the RF source 250.

[0107] Specifically, the first frame 211 may have slits at the first position 2111 and the second position 2112 respectively to form the first end 2412 and the second end 2413 of the first radiator 241 . The first frame 211 between the two slits constitutes the first radiator 241 .

[0108] It is understood that the specific positions of the first end 2412 and the second end 2413 on the first frame 211 can be determined based on the actual settings of the first position 2111 and the second position 2112. For example, the first end 2412 and the second end 2413 are both located on the first side 212; or the first end 2412 and the second end 2413 are both located on the second side 213.

[0109] In some embodiments provided by the present application, the second radiator 242 may have a third end 2421 and a fourth end 2422. The third end 2421 may be a ground end for grounding the second radiator 242, and the fourth end 2422 may be an open end that is not grounded.

[0110] Specifically, the second frame 221 may have slits at the third position 2211 and the fourth position 2212 to form the third end 2421 and the fourth end 2422 of the second radiator 242 . The second frame 221 between the two slits constitutes the second radiator 242 .

[0111] It is understood that the specific positions of the third end 2421 and the fourth end 2422 on the second frame 221 can be determined based on the actual settings of the third position 2211 and the fourth position 2212. For example, the third end 2421 and the fourth end 2422 are both located on the third side 222; or the third end 2421 and the fourth end 2422 are both located on the fourth side 223.

[0112] It can be understood that because the second radiator 242, acting as a parasitic branch, is grounded, when the foldable electronic device 200 is in the folded state, the first radiator 241 and the second radiator 242 are coupled, enabling them to better utilize the floor current to jointly generate radiation. In this case, the electrical length of the second radiator 242 is one-quarter of its operating wavelength, meaning that the second radiator 242 functions as a quarter-wavelength antenna.

[0113] It should be understood that electrical length can refer to the physical length (i.e., mechanical length or geometric length) multiplied by the ratio of the transmission time of an electrical or electromagnetic signal in a medium to the time required for this signal to travel the same distance as the physical length of the medium in free space. The electrical length can satisfy the following formula:

[0114] Where L is the physical length, a is the propagation time of the electrical or electromagnetic signal in the medium, and b is the propagation time in free space.

[0115] 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:

[0116] Where L is the physical length and λ is the wavelength of the electromagnetic wave.

[0117] In some embodiments, to better meet communication requirements, the antenna 240 may further include a switching circuit 243. One end 2431 of the switching circuit 243 is grounded, and the other end 2432 is connected to the second radiator 242 to adjust the resonant frequency of the second radiator 242, i.e., the parasitic branch, so that the antenna 240 can cover different frequency bands.

[0118] In one example, the switching circuit 243 may include a switch device 2433 and multiple different matching branches 2434 arranged in parallel. The multiple different matching branches 2434 may include, for example, matching branches 2434a and 2434b. One end of the switch device 2433 is grounded, and the other end is connected to one end of each of the matching branches 2434a and 2434b. The other ends of the matching branches 2434a and 2434b are respectively connected to the second radiator 242. In other words, one end of the switch device 2433 forms one end 2431 of the switching circuit 243, and the other ends of the matching branches 2434a and 2434b together form the other end 2432 of the switching circuit 243.

[0119] For example, matching branches 2434a and 2434b may each include a capacitor, a capacitor, or a 0-ohm resistor. Furthermore, the plurality of different matching branches 2434 may also include three, four, or five different matching branches, which is not limited in this application. The switch device 2433 may include, for example, but is not limited to, a single-pole double-throw switch, a double-pole double-throw switch, and the like.

[0120] It is understandable that the specific structure of the switching circuit 243 is merely illustrative and can be adjusted according to actual production and design requirements, and this application does not impose any restrictions on this.

[0121] In some embodiments, the second radiator 242 may be provided with a connection point 2423 . The connection point 2423 may be located near the fourth end 2422 of the second radiator 242 for connecting to the other end 2432 of the switching circuit 243 .

[0122] In some embodiments, when the length L2 of the second radiator 242 is greater than the length L1 of the first radiator 241, that is, L2 ≥ L1, to better meet the coupling requirements between the first radiator 241 and the second radiator 242, the distance D1 between the connection point 2423 and the fourth end 2422 of the second radiator 242 can satisfy the following: 0 ≤ D1 ≤ 1 / 2 L2. For example, the distance D1 between the connection point 2423 and the fourth end 2422 can be 1 / 5 L2, 1 / 4 L2, 1 / 3 L2, or 1 / 2 L2, etc., and this application is not limited to this.

[0123] Furthermore, in some embodiments, when L2 ≥ 1.5 L1, the distance D1 between the connection point 2423 and the fourth end 2422 of the second radiator 242 may satisfy the following: 1 / 3 L2 ≤ D1 ≤ 1 / 2 L2. For example, the distance D1 between the connection point 2423 and the fourth end 2422 may be 1 / 3 L2, 2 / 5 L2, 3 / 7 L2, or 1 / 2 L2, etc., and this application does not impose any limitation on this.

[0124] It is understandable that the range of the distance D1 between the above-mentioned connection point 2423 and the fourth end 2422 of the second radiator 242 is only illustrative and can be adjusted according to the lengths of the first radiator 241 and the second radiator 242 , and this application does not impose any limitation on this.

[0125] The above describes the various structures of the foldable electronic device 200. The following further describes the layout of the first radiator 241 in the first frame 211 and the second radiator 242 in the second frame 221 with reference to the accompanying drawings.

[0126] Continuing with reference to FIG. 4 , in the embodiment shown in FIG. 4 , the first position 2111 and the second position 2112 of the first frame 211 are both located at positions on the second side 213 away from the rotation axis 230 . The first position 2111 is located at the intersection of the first side 212 and the second side 213 , and the second position 2112 is located at a position on the second side 213 away from the intersection. In other words, the first end 2412 of the first radiator 241 is formed at the intersection of the first side 212 and the second side 213 for grounding; the second end 2413 of the first radiator 241 is formed at a position on the second side 213 away from the intersection, and the feeding point 2411 is located near the second end 2413 of the first radiator 241. In other words, the first radiator 241 is located on the wide side (x-direction) of the foldable electronic device 200 and is linear.

[0127] The third position 2211 of the second frame 221 is located on the third side 222, and the fourth position 2212 of the second frame 221 is located on the fourth side 223. In other words, the third end 2421 of the second radiator 242 is formed on the third side 222 for grounding; the fourth end 2422 of the second radiator 242 is formed on the fourth side 223, and the connection point 2423 is located near the fourth end 2422 of the second radiator 242. In other words, the second radiator 242 is located on both the wide side (x-direction) and the long side (y-direction) of the foldable electronic device, forming an L-shape. Furthermore, the length L2 of the second radiator 242 is twice the length L1 of the first radiator 241, and the distance D1 between the connection point 2423 and the fourth end 2422 is 2 / 5 L2.

[0128] When the foldable electronic device 200 is in the folded state, the first radiator 241 and the second radiator 242 are disposed opposite each other with a first gap 243 in the thickness direction (z-direction) of the foldable electronic device 200, and the first radiator 241 completely overlaps the second radiator 242. That is, when in the folded state, the coupling length L3 between the first radiator 241 and the second radiator 242 is equal to the length L1 of the first radiator 241. The size D2 of the first gap 243 can satisfy the following: 0.8 mm ≤ D2 ≤ 1.8 mm. For example, D2 can be 0.8 mm, 1.0 mm, 1.3 mm, or 1.7 mm. The specific value can be determined based on the specific data of the coupling length L3 between the first radiator 241 and the second radiator 242, and this application is not limited thereto.

[0129] It is understandable that in order to further illustrate the technical effects of the embodiments of the present application, Figures 5 and 6 are provided as a comparison.

[0130] Figure 5 shows a schematic diagram of the structure of a foldable electronic device in a folded state. The difference from the embodiment shown in Figure 4 is that in the embodiment shown in Figure 5, the lengths of the first radiator 241 and the second radiator 242 are equal.

[0131] Figure 6 shows a schematic diagram of the structure of another foldable electronic device in a folded state. The difference from the embodiment shown in Figure 4 is that in the embodiment shown in Figure 6, when the foldable electronic device is in the folded state, the second radiator 242 acts as a parasitic branch of the first radiator 241 and is not grounded.

[0132] 7 to 11 are diagrams showing simulation results of the antenna of the foldable electronic device 200 provided in an embodiment of the present application when the antenna is in a folded state.

[0133] Figure 7 is a scalar distribution diagram of the antenna local magnetic field of the outer plane of the top of the foldable electronic device shown in Figure 4 when it is in a folded state, and the outer plane is parallel to the xoz plane. Figure 8 is a vector distribution diagram of the antenna local magnetic field of the cross section of the foldable electronic device shown in Figure 4 when it is in a folded state, and the cross section is parallel to the xoz plane. The z direction in Figures 7 and 8 is parallel to the thickness direction of the foldable electronic device, and the x direction is parallel to the width direction (i.e., the horizontal direction) of the foldable electronic device. Among them, when the foldable electronic device 200 is in a folded state, the first spacing 244 between the first radiator 241 and the second radiator 242 is 1.8 mm.

[0134] Referring to Figures 7 and 8 , the antenna's magnetic field radiation area is dispersed into two regions, as indicated by the dashed boxes: the first radiator 241 and the second radiator 242. This means that the second radiator 242, acting as a parasitic branch of the first radiator 241, disperses the antenna's magnetic field radiation area. This effectively increases the width of the first radiator 241, broadening the antenna's radiation area and thus improving the antenna performance of foldable electronic devices when folded.

[0135] FIG9 is a diagram showing simulation results of the system efficiency and radiation efficiency of the antenna when the foldable electronic device shown in FIG4 and FIG5 is in a folded state.

[0136] Referring to FIG9 , when the antenna operates at a frequency of 2.1 GHz, the radiation efficiency of the antenna in the embodiment shown in FIG5 is -3.069 dB, while the radiation efficiency of the antenna in the embodiment shown in FIG4 is -1.5008 dB, representing an improvement of 1.5682 dB in radiation efficiency compared to FIG5 . In other words, compared to FIG5 , where the lengths of the first radiator 241 and the second radiator 242 are equal, in the embodiment shown in FIG4 , by setting the length of the second radiator 242 (i.e., the length of the parasitic branch) to be greater than the length of the first radiator 234, the radiation efficiency of the antenna can be further improved, the operating bandwidth of the antenna can be expanded, and the adverse effects on antenna performance caused by the reduced floor size or overlapping of the housing in the folded state can be reduced. This improves the antenna performance of the foldable electronic device in the folded state, resulting in excellent radiation characteristics.

[0137] Figure 10 is a schematic diagram of the current distribution structure at the location of the second radiator 242 when the foldable electronic device shown in Figures 4 and 6 is in the folded state. Figure 11 is a simulation result diagram of the system efficiency and radiation efficiency of the antenna when the foldable electronic device shown in Figures 4 and 6 is in the folded state. Figure 10(a) is a schematic diagram of the current distribution structure at the location of the second radiator 242 shown in Figure 6, and Figure 10(b) is a schematic diagram of the current distribution structure at the location of the second radiator 242 shown in Figure 4. The white arrows in the figures indicate the direction of the current in the second radiator 242.

[0138] Referring to Figure 10(a), the currents on the second radiator 242, or parasitic branch, in the embodiment shown in Figure 6 flow in the same direction. That is, in the folded state, the second radiator 242 is ungrounded and operates in a 1 / 2 mode (balanced) parasitic configuration. In this configuration, the first radiator 241 couples with the second radiator 242, whose electrical length is 1 / 2 the operating wavelength. However, in this mode, since the second radiator 242 is ungrounded, the antenna's connection to the floor of the foldable electronic device is weak, making it difficult to radiate from the floor. Referring to Figure 10(b), the currents on the second radiator 242 in the embodiment shown in Figure 4 flow both horizontally and vertically. That is, in the folded state, the second radiator 242 operates in a 1 / 4 mode parasitic configuration. In this mode, since the second radiator 242 is grounded, the antenna can better utilize the floor currents to generate radiation.

[0139] Referring to Figure 11 , when the antenna operates at a frequency of 1.68 GHz, the radiation efficiency of the antenna in the embodiment shown in Figure 6 is -3.0972 dB, while the radiation efficiency of the antenna in the embodiment shown in Figure 4 is -2.5535 dB, representing an improvement of 0.5437 dB compared to Figure 6 . In other words, compared to the 1 / 2 mode parasitics shown in Figure 6 , in the embodiment shown in Figure 4 , in the folded state, the second radiator 242 is grounded, thereby better utilizing the floor current to generate radiation and further improving the antenna's radiation efficiency.

[0140] The following continues with reference to the accompanying drawings to describe the layout of the first radiator 241 on the first frame 211 and the second radiator 242 on the second frame 221 .

[0141] FIG12 is a schematic structural diagram of another foldable electronic device 200 provided in an embodiment of the present application when in a folded state.

[0142] Referring to FIG. 12 , the difference from the embodiment shown in FIG. 4 is that, when the foldable electronic device 200 is in the folded state, a portion of the first radiator 241 overlaps with the second radiator 242 in the thickness direction (z-direction) of the foldable electronic device 200. In other words, when in the folded state, the coupling length L3 between the first radiator 241 and the second radiator 242 is less than the length L1 of the first radiator 241.

[0143] FIG13 is a schematic structural diagram of a foldable electronic device 200 provided in an embodiment of the present application when in a folded state.

[0144] Referring to Figure 13 , the difference from the embodiment shown in Figure 4 lies in that the third position 2211 and the fourth position 2212 of the second frame 221 are both located on the fourth side 223. The third position 2211 is located away from the rotation axis 230, while the fourth position 2212 is located closer to the rotation axis 230. In other words, the third end 2421 of the second radiator 242 is located on the fourth side 223 away from the rotation axis 230, while the fourth end 2422 is located on the fourth side 223 closer to the rotation axis 230. The second radiator 242 is linear. Furthermore, the length L2 of the second radiator 242 is 1.8 times the length L1 of the first radiator 241, and the distance D1 between the connection point 2423 and the fourth end 2422 is 1 / 3 L2.

[0145] When the foldable electronic device 200 is in the folded state, the first radiator 241 completely overlaps the second radiator 242 in the thickness direction (z-direction) of the foldable electronic device 200. In other words, when in the folded state, the coupling length L3 between the first radiator 241 and the second radiator 242 is equal to the length L1 of the first radiator 241.

[0146] FIG14 is a diagram showing simulation results of the system efficiency and radiation efficiency of the antenna when the foldable electronic device shown in FIG13 and FIG5 is in a folded state.

[0147] Referring to Figure 14 , when the antenna operates at a frequency of 2.1 GHz, the radiation efficiency of the antenna in the embodiment shown in Figure 5 is -3.069 dB, while the radiation efficiency of the antenna in the embodiment shown in Figure 13 is -1.8452 dB, representing a 1.2238 dB improvement in radiation efficiency compared to Figure 5 . In other words, compared to the embodiment shown in Figure 5 , where the lengths of first radiator 241 and second radiator 242 are equal, the embodiment shown in Figure 13 further improves the antenna's radiation efficiency and expands its operating bandwidth by setting the length of second radiator 242 (i.e., the length of the parasitic stub) greater than that of first radiator 234.

[0148] FIG15 is a schematic structural diagram of another foldable electronic device 200 provided in an embodiment of the present application when in a folded state.

[0149] Referring to Figure 15 , the difference from the embodiment shown in Figure 13 is that the first position 2111 and the second position 2112 of the first frame 211 are both located on the second side 213 near the rotation axis 230. The first position 2111 is farther from the rotation axis 230, while the second position 2112 is closer to the rotation axis 230. Furthermore, the length L2 of the second radiator 242 is 1.5 times the length L1 of the first radiator 241, and the distance D1 between the connection point 2423 and the fourth end 2422 is 1 / 3 L2.

[0150] When the foldable electronic device 200 is in the folded state, the first radiator 241 completely overlaps the second radiator 242 in the thickness direction (z-direction) of the foldable electronic device 200. In other words, when in the folded state, the coupling length L3 between the first radiator 241 and the second radiator 242 is equal to the length L1 of the first radiator 241.

[0151] FIG16 is a diagram showing simulation results of the system efficiency and radiation efficiency of the antenna when the foldable electronic device shown in FIG15 and FIG5 is in a folded state.

[0152] Referring to Figure 16 , when the antenna operates at a frequency of 2.1 GHz, the radiation efficiency of the antenna in the embodiment shown in Figure 5 is -3.069 dB, while the radiation efficiency of the antenna in the embodiment shown in Figure 4 is -2.1718 dB, representing an improvement of 0.8972 dB in radiation efficiency compared to that in Figure 5 . In other words, compared to the embodiment shown in Figure 5 where the lengths of first radiator 241 and second radiator 242 are equal, in the embodiment shown in Figure 15 , by setting the length of second radiator 242 (i.e., the length of the parasitic stub) to be greater than that of first radiator 234, the antenna's radiation efficiency can be further improved, thereby expanding its operating bandwidth.

[0153] FIG17 is a schematic structural diagram of another foldable electronic device 200 provided in an embodiment of the present application when in a folded state.

[0154] Referring to Figure 17 , the difference from the embodiment shown in Figure 15 lies in that the third position 2211 and fourth position 2212 of the second frame 221 are located opposite each other on the fourth side 223. That is, in the embodiment shown in Figure 17 , the third position 2211 is located on the fourth side 223 near the rotation axis 230, while the fourth position 2212 is located on the fourth side 223 away from the rotation axis 230. In other words, the third end 2421 of the second radiator 242 is formed on the fourth side 223 near the rotation axis 230, while the fourth end 2422 is formed on the fourth side 223 away from the rotation axis 230. Furthermore, the length L2 of the second radiator 242 is 1.8 times the length L1 of the first radiator 241, and the distance D1 between the connection point 2423 and the fourth end 2422 is 1 / 3 L2.

[0155] When the foldable electronic device 200 is in the folded state, the first radiator 241 completely overlaps the second radiator 242 in the thickness direction (z-direction) of the foldable electronic device 200. In other words, when in the folded state, the coupling length L3 between the first radiator 241 and the second radiator 242 is equal to the length L1 of the first radiator 241.

[0156] FIG18 is a diagram showing simulation results of the system efficiency and radiation efficiency of the antenna when the foldable electronic device shown in FIG17 and FIG5 is in a folded state.

[0157] Referring to Figure 18 , when the antenna operates at a frequency of 2.1 GHz, the radiation efficiency of the antenna in the embodiment shown in Figure 5 is -3.069 dB, while the radiation efficiency of the antenna in the embodiment shown in Figure 18 is -1.5098 dB, representing an improvement of 1.5592 dB compared to Figure 5 . In other words, compared to the embodiment shown in Figure 5 , where the lengths of first radiator 241 and second radiator 242 are equal, in the embodiment shown in Figure 4 , by setting the length of second radiator 242 (i.e., the length of the parasitic stub) to be greater than the length of first radiator 234, the antenna's radiation efficiency can be further improved, thereby expanding its operating bandwidth.

[0158] FIG19 is a diagram showing simulation results of the S parameters of the antenna when the foldable electronic device shown in FIG17 and FIG5 is in a folded state.

[0159] Referring to FIG19 , based on an S11 value less than -4 dB, the resonant bandwidth of the antenna in the embodiment shown in FIG17 is greater than that of the antenna in the embodiment shown in FIG5 . That is, compared to the embodiment shown in FIG5 , in which the lengths of the first radiator 241 and the second radiator 242 are equal, the embodiment shown in FIG17 further extends the resonant bandwidth of the antenna by setting the length of the second radiator 242 (i.e., the length of the parasitic stub) to be greater than the length of the first radiator 234.

[0160] FIG20 is a schematic structural diagram of another foldable electronic device 200 provided in an embodiment of the present application when in a folded state.

[0161] Referring to FIG. 20 , the difference from the embodiment shown in FIG. 17 is that, when the foldable electronic device 200 is in the folded state, a portion of the first radiator 241 overlaps with the second radiator 242 in the thickness direction (z-direction) of the foldable electronic device 200. In other words, when in the folded state, the coupling length L3 between the first radiator 241 and the second radiator 242 is less than the length L1 of the first radiator 241.

[0162] It can be understood that in the embodiment shown in Figure 20, when the foldable electronic device 200 is in the folded state, the first radiator 241 and the second radiator 242 are coupled as open-end electric field coupling, and the required amount of electric coupling is small. Therefore, when in the folded state, the coupling length L3 between the first radiator 241 and the second radiator 242 can be further less than 1 / 2 of the length L1 of the first radiator 241.

[0163] FIG21 is a schematic structural diagram of another foldable electronic device 200 provided in an embodiment of the present application when in a folded state.

[0164] Referring to Figure 21 , the difference from the embodiment shown in Figure 4 is that the first position 2111 and the second position 2112 of the first frame 211 are both located on the first side 212. In other words, the first end 2412 and the second end 2413 of the first radiator 241 are both formed on the first side 212. In other words, the first radiator 241 is located on the long side (y-direction) of the foldable electronic device 200 and is linear.

[0165] When the foldable electronic device 200 is in the folded state, the first radiator 241 completely overlaps the second radiator 242 in the thickness direction (z-direction) of the foldable electronic device 200. In other words, when in the folded state, the coupling length L3 between the first radiator 241 and the second radiator 242 is equal to the length L1 of the first radiator 241.

[0166] FIG22 is a schematic structural diagram of another foldable electronic device 200 provided in an embodiment of the present application when in a folded state.

[0167] Referring to FIG. 22 , the difference from the embodiment shown in FIG. 21 is that, when the foldable electronic device 200 is in the folded state, a portion of the first radiator 241 overlaps with the second radiator 242 in the thickness direction (z-direction) of the foldable electronic device 200. In other words, when in the folded state, the coupling length L3 between the first radiator 241 and the second radiator 242 is less than the length L1 of the first radiator 241.

[0168] It is understandable that the above-mentioned layout of the first radiator 241 on the first frame 211 and the second radiator 242 on the second frame 221 is only for reference and can be adjusted according to actual production and design requirements, which is not limited in this application.

[0169] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A foldable electronic device, characterized in that: include: A first shell and a second shell, the first shell comprising a first frame, and the second shell comprising a second frame; A rotating shaft, the rotating shaft is located between the first shell and the second shell, and the rotating shaft is rotatably connected to the first shell and the second shell respectively; An antenna, the antenna comprising a first radiator and a second radiator, the first radiator comprising a portion of the first frame, the second radiator comprising a portion of the second frame, The first radiator is provided with a feeding point for feeding the antenna, and the length of the second radiator is greater than the length of the first radiator; When the foldable electronic device is in a folded state, in a thickness direction of the foldable device, the first radiator and the second radiator are arranged relative to each other at a first interval, and at least a portion of the first radiator overlaps with the second radiator, so that the first radiator and the second radiator are coupled.

2. The foldable electronic device according to claim 1, characterized in that: The length L1 of the first radiator and the length L2 of the second radiator satisfy: L2≥1.5L1.

3. The foldable electronic device according to claim 1 or 2, characterized in that: The first radiator comprises a first end and a second end, the first end is grounded, and the feeding point is located at a position of the first radiator close to the second end; The second radiator includes a third end and a fourth end, and the third end is grounded.

4. The foldable electronic device according to claim 3, characterized in that: The foldable electronic device further includes a switching circuit, the second radiator is provided with a connection point, and the connection point is located at a position of the second radiator close to the fourth end, One end of the switching circuit is grounded, and the other end of the switching circuit is connected to the connection point, so as to adjust the resonant frequency of the second radiator.

5. The foldable electronic device according to claim 4, characterized in that: A distance D1 between the connection point and the fourth end satisfies: 1 / 3L2≤D1≤1 / 2L2, where L2 is the length of the second radiator.

6. The foldable electronic device according to claim 4 or 5, characterized in that: The switching circuit includes a switch device and a plurality of matching branches of a parallel device, one end of the switch device is grounded, the other end of the switch device is connected to the plurality of matching branches, and the other ends of the plurality of matching branches are connected to the connection point, The switching device switches between the plurality of matching branches to adjust the resonant frequency of the second radiator.

7. The foldable electronic device according to any one of claims 1 to 6, characterized in that: The first frame has a first position and a second position, and the second frame has a third position and a fourth position; The first radiator includes a first border between the first position and the second position; The second radiator includes a second frame between the third position and the fourth position.

8. The foldable electronic device according to claim 7, characterized in that: The first frame includes a first side and a second side that intersect at an angle, and the first side is parallel to the extending direction of the rotating shaft; wherein, The first position and the second position are located at the first side; or, The first position and the second position are located on the second side.

9. The foldable electronic device according to claim 8, characterized in that: The second frame includes a third side and a fourth side that intersect at an angle, and the third side is parallel to the extending direction of the rotating shaft; wherein, The third position and the fourth position are located on the third side; or, The third position and the fourth position are located on the fourth side; or, The third position is located at the third side, and the fourth position is located at the fourth side.

10. The foldable electronic device according to claim 9, characterized in that: The first position is located in an overlapping area between the first side and the second side, and the third position is located in an overlapping area between the third side and the fourth side.

11. The foldable electronic device according to any one of claims 1 to 10, characterized in that: When the foldable device is in a folded state, a length L3 of an overlapping portion of the first radiator and the second radiator satisfies: L3>1 / 2L1, where L1 is the length of the first radiator.

Images