Foldable equipment

Abstract

The invention provides foldable equipment, relates to the technical field of communication equipment, and aims to solve the problem of poor radiation efficiency of the foldable equipment in a folded state. The foldable equipment provided by the invention comprises a first shell and a second shell, the first shell comprises a first frame, the first frame comprises a radiator, and the radiator has at least two resonance modes; the first shell comprises a first frame, the second shell comprises a second frame, the second frame comprises a coupling branch, the foldable device further comprises a first filter circuit, the first filter circuit is connected with the coupling branch, and when the foldable device is in a folded state, the projection of the radiator and the projection of the coupling branch are at least partially overlapped in the thickness direction of the foldable device. The first filter circuit is used for coupling the coupling branch with at least two resonant modes of the radiator. In the foldable equipment provided by the invention, the coupling branch knot is coupled with the radiator, and the radiation efficiency of the radiator can be compensated, so that the radiation efficiency of the foldable equipment can be ensured.

Description

Technical Field

[0001] This application relates to the field of communication equipment technology, and more particularly to a foldable device. Background Technology

[0002] Foldable devices can switch between a folded and an unfolded state. When users need to carry a foldable device with them, they can fold it to reduce its size, thereby improving portability. When using a foldable device, users can unfold it to provide a larger display and operating area, thereby improving ease of use.

[0003] Since foldable devices have two different usage states in actual use—folded and unfolded—the antenna design of foldable devices needs to take into account the performance under different usage states, which brings new challenges to antenna design. Summary of the Invention

[0004] This application provides a foldable device that has good signal transmission and reception performance in both folded and unfolded states.

[0005] The foldable device provided in this application includes a first housing and a second housing, which are foldable or unfoldable relative to each other, thereby realizing the folding and unfolding functions of the foldable device. The first housing includes a first frame, within which a radiator has at least two resonant modes. The second housing includes a second frame, within which a coupling stub is included. The coupling stub includes a first end, a second end, and a ground point. The first end is located at one end of the coupling stub, the second end is located at the other end of the coupling stub, and the ground point is located between the first end and the second end. Additionally, the foldable device includes a first filter circuit, one end of which is connected to the coupling stub, the other end of which is connected to a reference ground in the foldable device, and the ground point is connected to the reference ground in the foldable device. When the foldable device is in a folded state, the projections of the radiator and the coupling stub at least partially overlap in the thickness direction of the foldable device, and the first filter circuit is used to couple the coupling stub to at least two resonant modes of the radiator.

[0006] In the foldable device provided in this application, after the radiator radiates electromagnetic waves, the energy is radiated to the coupling stub, causing a coupling current to be generated on the coupling stub, thus forming secondary radiation. Through reasonable design of the coupling stub, it can compensate for the radiator. Alternatively, it can be understood that when the radiator radiates electromagnetic waves outward, the coupling stub, due to coupling with the radiator and generating resonance, can also radiate electromagnetic waves outward, thereby improving the radiation performance of the foldable device. One end of the first filter circuit is connected to the coupling stub, and the other end is connected to a reference ground. The first filter circuit is used to provide a new current return path to ground for the coupling stub, thereby increasing the resonant modes of the coupling stub, so that the coupling stub can simultaneously couple multiple resonant modes in the radiator, thereby improving the radiation performance of the foldable device.

[0007] In one example, the grounding point is located in the middle of the coupling. For example, the length between the grounding point and the first end is L1, and the length between the grounding point and the second end is L2. The ratio of L1 to L2 is greater than or equal to 1 / 3 and less than or equal to 3.

[0008] In one example, when the foldable device is in a folded state, the length of the overlapping portion of the projections of the radiator and the coupling stub in the thickness direction of the foldable device is L3, and the length of the radiator is L0; wherein L3 is greater than or equal to 1 / 2L0. By reasonably setting the length of the overlapping portion of the projections of the radiator and the coupling stub, the coupling stub can be better coupled with the radiator, thereby effectively improving the radiation performance of the foldable device in the folded state.

[0009] In one example, the length of the coupling stub is greater than the length of the radiator. When the foldable device is in a folded state, the projection of the radiator onto the coupling stub lies within the coupling stub in the thickness direction of the foldable device.

[0010] In one example, the foldable device further includes a second filter circuit, one end of which is connected to the coupling stub, and the other end of which is connected to a reference ground in the foldable device. When the foldable device is in a folded state, the projections of the radiator and the coupling stub at least partially overlap in the thickness direction of the foldable device. The second filter circuit is used to couple the coupling stub to at least two resonant modes of the radiator. By adding the second filter circuit, more current return paths can be provided to the coupling stub, thereby increasing the number of resonant modes of the coupling stub. This allows the coupling stub to simultaneously couple to multiple resonant modes in the radiator, thereby improving the radiation performance of the foldable device.

[0011] In the specific configuration, the first filter circuit is a bandpass filter circuit, and the second filter circuit is a bandpass filter circuit.

[0012] In one example, the foldable device also includes a matching circuit. The matching circuit is connected to a first and / or second end of the coupling stub and is used to adjust the operating frequency of the coupling stub, thereby improving the operating performance of the coupling stub.

[0013] In one example, the first frame includes multiple radiators, and the second frame includes multiple coupling branches. When the foldable device is in a folded state, the multiple radiators and multiple coupling branches are coupled one-to-one. By using multiple radiators, the radiation performance of the foldable device can be effectively improved. In addition, each radiator is equipped with a corresponding coupling branch, thus enabling effective compensation for the radiation gain of each radiator.

[0014] In one example, the radiator is located at the corner of the first border, and the coupling stub is located at the corner of the second border. Alternatively, the radiator is located on the straight edge of the first border, and the coupling stub is located on the straight edge of the second border. In practice, the positions of the radiator and coupling stub can be flexibly configured according to actual needs.

[0015] In one example, the radiator includes a ground point and a feed point. The foldable device also includes radio frequency (RF) circuitry connected to the feed point, and the ground point connected to a reference ground within the foldable device. The RF circuitry is fed to the feed point, allowing a feed signal to be sent to the radiator, causing it to radiate electromagnetic waves. Additionally, electromagnetic waves received by the radiator from the outside environment can be transmitted through the feed point to the RF circuitry for processing.

[0016] In one example, the foldable device also includes a hinge connecting a first housing and a second housing, which can be folded or unfolded relative to each other around the hinge. In specific applications, the type of hinge can be appropriately selected based on actual needs. Attached Figure Description

[0017] Figure 1 A three-dimensional structural diagram of a foldable device in an unfolded state, provided as an embodiment of this application;

[0018] Figure 2 A three-dimensional structural diagram of a foldable device in a folded state, provided as an embodiment of this application;

[0019] Figure 3 An exploded structural diagram of a portion of another foldable device provided in an embodiment of this application;

[0020] Figure 4 A schematic diagram of another foldable device in a folded state, provided as an embodiment of this application;

[0021] Figure 5An exploded structural diagram of a portion of another foldable device provided in an embodiment of this application;

[0022] Figure 6 A schematic diagram of another foldable device in a folded state, provided as an embodiment of this application;

[0023] Figure 7 for Figure 6 A magnified view of a portion of the image;

[0024] Figure 8 This is a partial structural diagram of another foldable device provided in an embodiment of this application;

[0025] Figure 9 A schematic diagram showing the current distribution of a coupled stub provided in an embodiment of this application;

[0026] Figure 10 A simulation diagram showing the radiation efficiency of a foldable device as a function of frequency, provided as an embodiment of this application;

[0027] Figure 11 This is a partial structural diagram of a foldable device provided in an embodiment of this application;

[0028] Figure 12 This is a three-dimensional structural diagram of a foldable device in a folded state, provided as an embodiment of this application.

[0029] Figure 13 This is a partial structural schematic diagram of another foldable device provided in an embodiment of this application;

[0030] Figure 14 A schematic diagram showing the current distribution of a coupled stub provided in an embodiment of this application;

[0031] Figure 15 A schematic diagram of another foldable device in a folded state, provided as an embodiment of this application;

[0032] Figure 16 An exploded structural diagram of a portion of another foldable device provided in an embodiment of this application;

[0033] Figure 17 A schematic diagram of another foldable device in a folded state, provided as an embodiment of this application;

[0034] Figure 18 This is an exploded structural diagram of a portion of another foldable device provided in an embodiment of this application. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of this application clearer, the application will now be described in further detail with reference to the accompanying drawings.

[0036] The foldable devices provided in this application can specifically be mobile phones, tablets, laptops, and e-readers. Alternatively, foldable devices can also be wearable devices with folding functions, such as smartwatches, smart bracelets, and smart glasses. To facilitate understanding of the technical solutions in this application, the following examples will use a mobile phone as an example for illustrative purposes.

[0037] like Figure 1 As shown, in one example provided in this application, the foldable device 10 includes a first housing 11, a second housing 12, a hinge 13, and a flexible screen 14. The hinge 13 connects the first housing 11 and the second housing 12, and the first housing 11 and the second housing 12 can be folded or unfolded relative to each other by means of the hinge 13.

[0038] like Figure 1 As shown, a flexible screen 14 (such as an OLED screen) can be disposed on the surfaces of the first housing 11 and the second housing 12. When the foldable device 10 is unfolded, the flexible screen 14 can provide a larger display area and operating area to improve usability.

[0039] like Figure 2 As shown, when the foldable device 10 is folded, the first housing 11 and the second housing 12 are stacked on top of each other in the thickness direction of the foldable device 10, thereby reducing the area of ​​the foldable device 10 and improving its portability. It should be noted that the example provided in this application uses an outward-folding mobile phone as an example. In other examples, the foldable device 10 can also be an inward-folding mobile phone. Alternatively, it can be an electronic device with other foldable configurations.

[0040] In practical applications, in order to achieve the ability to transmit and receive wireless signals, a radiator 1111 (or antenna) is usually provided in the foldable device 10. The radiator 1111 can radiate wireless signals to the outside world or receive wireless signals from the outside world, thereby realizing the wireless communication capability of the foldable device 10.

[0041] like Figure 1 and Figure 2 As shown, in one example, the first housing 11 includes a first frame 111, and the second housing 12 includes a second frame 121. A segment of the first frame 111 can serve as a radiator 1111, thereby enabling the wireless signal transmission and reception function of the foldable device 10.

[0042] like Figure 2As shown, when the foldable device 10 is in a folded state, the first frame 111 and the second frame 121 are approximately stacked. Therefore, the second frame 121 will block the radiator 1111 of the first frame 111, thereby degrading the signal transmission and reception performance of the radiator 1111. For example, the radiation efficiency of the radiator 1111 may decrease by 2-5 dB, thus significantly reducing the communication performance of the foldable device 10.

[0043] Therefore, this application provides a foldable device 10 with good signal transmission and reception performance.

[0044] To make the objectives, technical solutions, and advantages of this application clearer, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0045] like Figure 3 and Figure 4 As shown, Figure 3 An exploded perspective view of the foldable device 10 in its unfolded state is shown; Figure 4 A perspective view of the foldable device 10 in its folded state is shown. In one example provided in this application, the first border 111 includes a radiator 1111, and the second border 121 includes a coupling branch 1211. Figure 4 As shown, when the foldable device 10 is in a folded state, the projections of the radiator 1111 and the coupling stub 1211 at least partially overlap in the thickness direction of the foldable device 10, and the radiator 1111 is coupled to the coupling stub 1211. After radiating electromagnetic waves, the energy of the radiator 1111 is radiated to the coupling stub 1211, causing a coupling current to be generated on the coupling stub 1211, thus forming secondary radiation. Through reasonable design, the coupling stub 1211 can compensate for the radiator 1111. Alternatively, it can be understood that when the radiator 1111 radiates electromagnetic waves outward, due to the coupling and resonance between the coupling stub 1211 and the radiator 1111, the coupling stub 1211 can also radiate electromagnetic waves outward, thereby improving the radiation performance of the foldable device 10. Specifically, the projections of the radiator 1111 and the coupling stub 1211 at least partially overlap can include complete or partial overlap. In practical applications, the area of ​​overlap between the projections of the radiator 1111 and the coupling stub 1211 can be reasonably set according to actual needs.

[0046] To facilitate understanding of the technical solution of this application, an exemplary description of a possible structure of the first housing 11 and the second housing 12 will be provided below.

[0047] like Figure 3 and Figure 5 As shown, Figure 5A plan view of the foldable device 10 in its unfolded state is shown. The first housing 11 includes a first frame 111 and a first middle plate 112. The first middle plate 112 is a rectangular plate structure. The first middle plate 112 includes four sides, namely side 112a, side 112b, side 112c, and side 112d. The first frame 111 is a roughly U-shaped frame, including a first segment 111a, a second segment 111b, and a third segment 111c. The first segment 111a is located at the edge of side 112a, the second segment 111b is located at the edge of side 112b, and the third segment 111c is located at the edge of side 112c. It should be noted that the first segment 111a, the second segment 111b, and the third segment 111c are all straight edges, and the second segment 111b is transitioned to the first segment 111a and the third segment 111c by a rounded corner.

[0048] The first intermediate plate 112 provides effective mounting positions for components such as the circuit board, camera, battery, and flexible screen 14 in the foldable device 10, allowing these components to be securely installed within the foldable device 10. Furthermore, the first intermediate plate 112 enhances the structural strength of the foldable device 10, preventing deformation or other defects in the first housing 11. Additionally, the first intermediate plate 112 can serve as a reference ground for the foldable device 10. For example, grounding points in some components on the circuit board can be electrically connected to the first intermediate plate 112 to meet grounding requirements.

[0049] Continue reading Figure 3 and Figure 5 The second housing 12 includes a second frame 121 and a second middle plate 122. The second middle plate 122 is a rectangular plate structure. The second middle plate 122 includes four sides: side 122a, side 122b, side 122c, and side 122d. The second frame 121 is a roughly U-shaped frame, including a first segment 121a, a second segment 121b, and a third segment 121c. The first segment 121a is located at the edge of side 122a, the second segment 121b is located at the edge of side 122b, and the third segment 121c is located at the edge of side 122c. Furthermore, the first segment 121a, the second segment 121b, and the third segment 121c are all straight edges, and the second segment 121b is connected to the first segment 121a and the third segment 121c by rounded corners.

[0050] The second intermediate plate 122 functions similarly to the first intermediate plate 112. Simply put, the second intermediate plate 122 provides an effective mounting location for components in the foldable device 10. Additionally, the second intermediate plate 122 can also serve as a reference ground for the foldable device 10, which will not be elaborated upon here.

[0051] Hinge 13 connects the side 112d of the first middle frame and the side 122d of the second middle frame, enabling the first housing 11 and the second housing 12 to fold and unfold under the action of hinge 13. It should be noted that in practical applications, hinge 13 may specifically include at least one pivot. That is, the first housing 11 and the second housing 12 are connected by hinge 13 to achieve folding and unfolding. In specific configurations, hinge 13 can adopt commonly used types, and the connection between hinge 13 and the first housing 11 and the second housing 12 can also be achieved using commonly used methods. Additionally, in some examples, the first housing 11 and the second housing 12 can be directly connected to achieve relative folding or unfolding between them. In practical applications, the connection structure between the first housing 11 and the second housing 12 can be reasonably configured according to actual needs; this application does not impose any limitations on this.

[0052] When configuring the first housing 11, it can be a one-piece molded structural component. Alternatively, the first middle plate 112 and the first frame 111 within the first housing 11 can also be independently molded structural components. For example, when the first housing 11 is a one-piece molded structural component, it can be manufactured using processes such as injection molding, stamping, or CNC machine tool processing, thereby forming the first middle plate 112 and the first frame 111. The materials of the first middle plate 112 and the first frame 111 can be the same or different. For example, both the first middle plate 112 and the first frame 111 can be made of metallic materials such as aluminum alloy, titanium alloy, or stainless steel. Alternatively, the first middle plate 112 or the first frame 111 can also be made of non-metallic materials such as plastic.

[0053] When setting the second housing 12, a similar setting can be made with reference to the structure type of the first housing 11 described above, and will not be elaborated here.

[0054] It should be noted that, in order to facilitate understanding of the technical solution of this application, the following example will be exemplified by the fact that the first middle plate 112, the first frame 111, the second middle plate 122 and the second frame 121 are all made of metal.

[0055] In the example provided in this application, both the first frame 111 and the second frame 121 are made of metal material and have good electrical conductivity. Therefore, in practical applications, at least a portion of the first frame 111 can be used as a radiator 1111 and at least a portion of the second frame 121 can be used as a coupling stub 1211 to realize the signal transmission and reception function of the foldable device 10.

[0056] For radiator 1111, please refer to Figure 6 and Figure 7 . Figure 6 A structural perspective view of the foldable device 10 in its folded state is shown. It should be noted that... Figure 6 In the diagram, to clearly illustrate the radiator 1111 and the coupling stub 1211, the first and second intermediate plates are not shown. The first frame 111 includes the radiator 1111, which is connected to the radio frequency circuitry in the foldable device 10. Figure 6 (Not shown in the image) The power supply connection allows the radio frequency circuit to send radio frequency signals to the radiator 1111, thereby exciting the radiator 1111 to radiate electromagnetic waves outward.

[0057] For details, please refer to the following: Figure 5 , Figure 6 and Figure 7 ,in, Figure 7 for Figure 6 A magnified view of a portion of the image. In one example provided in this application, the radiator 1111 is located in the second segment 111b of the first border 111. Additionally, as... Figure 7 As shown, to ensure the radiation performance of the radiator 1111, two gaps, 1112 and 1113, are provided in the first frame 111. These gaps disconnect the electrical connection between the radiator 1111 and other parts of the second segment 111b. Additionally, gaps 1112 and 1113 can extend to the space between the radiator 1111 and the first intermediate plate 112. That is, there is also a gap between the radiator 1111 and the first intermediate plate 112, which disconnects the electrical connection in most areas between them, allowing the radiator 1111 to radiate electromagnetic waves more effectively. A metal segment 1116 connects the radiator 1111 and the first intermediate plate 112, providing a conductive connection to meet the grounding requirements of the radiator 1111.

[0058] The radiator 1111 includes a grounding point and a power feeding point. For ease of understanding, the grounding point is defined as grounding point 11111, and the power feeding point is defined as power feeding point 11112. The radio frequency circuit (not shown) in the foldable device 10 is connected to power feeding point 11112. The radio frequency circuit can send radio frequency signals to the radiator 1111 through power feeding point 11112, thereby exciting the radiator 1111 to radiate electromagnetic waves outward. The grounding point 11111 is connected to the first intermediate plate 112 through metal segment 1116, thereby satisfying the grounding requirements of the radiator 1111.

[0059] Understandably, in some other examples, the metal segment 11116 may be omitted, and the grounding point 11111 of the radiator 1111 can be connected to the first intermediate plate 112 or other reference ground via a wire to meet the grounding requirements of the radiator 1111. Additionally, in some examples, insulating material may be filled into the gaps 1112 and 1113 to strengthen the connection between the radiator 1111 and other parts of the first intermediate plate 112 and the first frame 111.

[0060] It should be noted that in practical applications, the radiator 1111 can operate on multiple frequency bands. For example, the operating frequency band of the radiator 1111 may include at least two of the following: GPS, WIFI 2.4G, and WIFI 5G. The length, shape, and locations of the grounding point 11111 and feed point 11112 of the radiator 1111 have a significant impact on its operating frequency. Therefore, in specific settings, these parameters can be appropriately configured according to the required operating frequency band.

[0061] For coupled stub 1211, please refer to [the relevant documentation]. Figure 5 , Figure 6 and Figure 7 In one example provided in this application, the coupling stub 1211 is located in the second segment 121b of the second border 121. Additionally, as... Figure 7 As shown, to ensure good coupling between the coupling stub 1211 and the radiator 1111, two gaps, stub 1114 and stub 1115, are provided in the second frame 121. These gaps disconnect the electrical connection between the coupling stub 1211 and other parts of the second segment 121b. Additionally, gaps 1114 and stub 1115 can extend to the area between the coupling stub 1211 and the second middle plate 112. That is, a gap also exists between the coupling stub 1211 and the second middle plate 112. This gap disconnects the electrical connection between the coupling stub 1211 and most of the area between the second middle plate 122, allowing the coupling stub 1211 to couple well with the radiator 1111 and radiate electromagnetic waves outwards. A metal segment 1117 is connected between the coupling stub 1211 and the second intermediate plate 112. The metal segment 1117 can realize the conductive connection between the coupling stub 1211 and the second intermediate plate 122 to meet the grounding requirements of the coupling stub 1211.

[0062] The coupling stub 1211 includes a grounding point and a connection point to the first filter circuit 15. For ease of understanding, the grounding point is defined as grounding point 12111, and the connection point to the first filter circuit 15 is defined as first connection point 12112. Grounding point 12111 is connected to the second intermediate plate 122 via metal segment 1117, thereby satisfying the grounding requirements of coupling stub 1211. Additionally, the foldable device 10 also includes a first filter circuit 15, one end of which is connected to the first connection point 12112, and the other end is connected to a reference ground. The first filter circuit 15 provides a new current return path to ground for coupling stub 1211, thereby increasing the resonant modes of coupling stub 1211 so that coupling stub 1211 can simultaneously couple multiple resonant modes in radiator 1111, thereby improving the radiation performance of foldable device 10.

[0063] Understandably, in some other examples, the metal segment 11117 may be omitted, and the grounding point 12111 of the coupling stub 1211 can be connected to the second intermediate plate 122 or other reference ground via a wire to meet the grounding requirements of the coupling stub 1211. Additionally, in some examples, insulating material may be filled into the gaps 1114 and 1115 to strengthen the connection between the coupling stub 1211 and the other parts of the second intermediate plate 122 and the second frame 121.

[0064] It should be noted that in practical applications, the first filter circuit 15 can increase the current return path in the coupling stub 1211, enabling the coupling stub 1211 to operate simultaneously in multiple modes (or frequency bands). Therefore, when the radiator 1111 operates in multiple modes, the coupling stub 1211 can effectively couple with multiple operating frequency bands of the radiator 1111. For example, when the operating frequency bands of the radiator 1111 include GPS, WIFI 2.4G, and WIFI 5G bands, the first filter circuit 15 can cause the coupling stub 1211 to generate three resonant modes. One resonant mode can correspond to GPS, another to WIFI 2.4G, and the third to WIFI 5G.

[0065] In some examples, the frequency offset of the coupling stub 1211 can also be adjusted by a matching circuit.

[0066] For example, such as Figure 8 As shown, Figure 8This is a planar schematic diagram showing the coupling stub 1211. In one example provided in this application, the foldable device 10 also includes two matching circuits, which are respectively connected to both ends of the coupling stub 1211. In practical applications, the operating frequency of the coupling stub 1211 is strongly correlated with its size. During manufacturing, factors such as processing errors may affect the operating frequency of the coupling stub 1211. Therefore, in the example provided in this application, the frequency offset of the coupling stub 1211 can be adjusted by the matching circuits, thereby reducing the adverse effects of processing errors and other factors on the operating frequency of the coupling stub 1211. In specific applications, the matching circuits may include inductors, capacitors, resistors, and other devices. The matching circuits can be of commonly used types, and this application does not impose any limitations on this. Furthermore, in practical applications, the matching circuit can be connected to one end of the coupling stub 1211, or matching circuits can be connected to both ends of the coupling stub 1211, which will not be elaborated here.

[0067] In the example provided in this application, the coupling stub 1211 adopts a structure with the middle grounded and both ends open, enabling the coupling stub 1211 to have two resonant modes. Furthermore, after adding the first filter circuit 15, the current return path in the coupling stub 1211 can be further increased, thereby increasing the number of resonant modes of the coupling stub 1211, so that the coupling stub 1211 can have three or more resonant modes.

[0068] For example, such as Figure 9 As shown, three different current distributions on the coupling stub 1211 are illustrated, represented by dashed arrows. S1 represents the slot common-mode (Slot CM) mode, where the current flows from one end of the coupling stub 1211 to ground at the first filter circuit 15. S2 represents the slot common-mode (Slot CM) mode, where the current flows from one end of the coupling stub 1211 to the ground point 12111. S3 represents the wire differential-mode (Wire DM) mode, where the current flows from one end of the coupling stub 1211 to the other, with no ground return current, which is more conducive to solving the clutter problem of folded flexible screens.

[0069] In addition, such as Figure 10 As shown in the figure, this application embodiment also provides a simulation diagram of the radiation efficiency of the foldable device 10.

[0070] Figure 10 In the graph, the horizontal axis represents frequency in GHz, and the vertical axis represents radiation efficiency in dB.

[0071] Figure 10In the diagram, curve S11 shows the radiation efficiency of radiator 1111 operating in the GPS and WIFI 2.4G frequency bands without the coupling stub 1211, as a function of frequency. Curve S12 shows the radiation efficiency of radiator 1111 operating in the GPS and WIFI 2.4G frequency bands without the coupling stub 1211, as a function of frequency. Curve S13 shows the standing wave ratio of radiator 1111 operating in the GPS and WIFI 2.4G frequency bands without the coupling stub 1211.

[0072] Figure 10 In the diagram, curve S21 shows the radiation efficiency of radiator 1111 operating in the GPS and WIFI 2.4G frequency bands as a function of frequency after setting the coupling stub 1211. Curve S22 shows the radiation efficiency of radiator 1111 operating in the GPS and WIFI 2.4G frequency bands as a function of frequency after setting the coupling stub 1211. Curve S23 shows the standing wave ratio of radiator 1111 operating in the GPS and WIFI 2.4G frequency bands after setting the coupling stub 1211.

[0073] The comparison clearly shows that after setting the coupling branch 1211, the radiation performance of the radiator 1111 in the GPS and WIFI 2.4G bands can be improved by 0.7-1.6dB.

[0074] In addition, the grounding point 12111 of the aforementioned coupling stub 1211 being located in the middle of the coupling stub 1211 specifically means that the ratio of the distance between the grounding point 12111 and the two ends of the coupling stub 1211 is greater than or equal to 1 / 3 and less than or equal to 3.

[0075] For example, such as Figure 11 As shown, the grounding point 12111 and the first end of the coupling stub 1211 (as shown) Figure 11 The length between the upper end of the middle section is L1, and the grounding point 12111 and the second end (such as...) Figure 11 The length between the lower ends of L1 and L2 is L2. The ratio of L1 to L2 is greater than or equal to 1 / 3 and less than or equal to 3. In practical applications, the ratio of L1 to L2 can be set appropriately according to actual needs, which will not be elaborated here.

[0076] In addition, when setting up the radiator 1111 and the coupling branch 1211, after the foldable device 10 is in a folded state, the length of the overlapping part of the projection of the radiator 1111 and the coupling branch 1211 can also be reasonably set so that the coupling branch 1211 can be effectively coupled with the radiator 1111.

[0077] For example, such as Figure 12As shown in one example provided in the application, the relative positions of the radiator 1111 and the coupling branch 1211 are shown after the foldable device 10 is in a folded state.

[0078] Figure 12 In the diagram, the length of the radiator 1111 is L0, and the length of the overlapping portion of the projections of the radiator 1111 and the coupling stub 1211 is L3. In specific configurations, L3 can be greater than or equal to 1 / 2L0, ensuring good coupling between the coupling stub 1211 and the radiator 1111. In practical applications, the length of the overlapping portion of the projections of the radiator 1111 and the coupling stub 1211 can be reasonably set according to actual needs, and will not be elaborated upon here.

[0079] Furthermore, the above example illustrates the foldable device 10 by including a first filter circuit 15 connected to the coupling stub 1211. In other examples, the foldable device 10 may also include two or more filter circuits connected to the coupling stub 1211.

[0080] For example, such as Figure 13 As shown, in another example provided in this application, the foldable device 10 includes two filtering circuits, namely a first filtering circuit 15 and a second filtering circuit 16. The coupling stub 1211 includes two connection points, namely a first connection point 12112 and a second connection point 12113. The first filtering circuit 15 is connected to the first connection point 12111, and the second filtering circuit 16 is connected to the second connection point 12113. The first connection point 12112 is located between one end of the coupling stub 1211 and the ground point 12111. The second connection point 12113 is located between the other end of the coupling stub 1211 and the ground point 12111. The distance between the first connection point 12112 and the ground point 12111, and the distance between the second connection point 12113 and the ground point 1211, can be the same or different.

[0081] By adding a second filter circuit 16, the resonant modes of the coupling stub 1211 can be further increased, enabling the coupling stub 1211 to better couple with different operating frequency bands of the radiator 1111.

[0082] For example, such as Figure 14As shown, five different current distributions on the coupling stub 1211 are illustrated, represented by dashed arrows. S1 represents the slot common-mode (Slot CM) mode, where the current flows from one end of the coupling stub 1211 to the ground point 12111. S2 represents the slot common-mode (Slot CM) mode, where the current flows from one end of the coupling stub 1211 to the ground point 12111. S3 represents the wire differential-mode (Wire DM) mode, where the current flows from one end of the coupling stub 1211 to the other, with no return current, which is more conducive to solving the clutter problem of the folded flexible screen. S4 represents the wire common-mode (Wire CM) mode, where the current flows from the second filter circuit 16 to the second filter circuit 15, i.e., the entire arm. S5 represents the wire common-mode (Wire CM) mode, where the current flows from the second filter circuit 16 to the ground point 12111 and back to ground.

[0083] In summary, the coupling stub 1211, which uses a T-shaped stub with disconnected ends and grounded in the middle, can exist in multiple modes. Furthermore, by adding a filter circuit, new current paths to ground can be added to achieve more resonant modes at various frequencies.

[0084] In practical applications, the first filter circuit 15 can be a bandpass filter circuit, and the second filter circuit 16 can also be a bandpass filter circuit.

[0085] Alternatively, in some examples, the radiator 1111 and the coupling stub 1211 may also be located in other places.

[0086] For example, such as Figure 15 and Figure 16 As shown, in one example provided in this application, a portion of the radiator 1111 is located in the first segment 111a of the first border 111, and another portion of the radiator 1111 is located in the second segment 111b. Alternatively, it can be understood that the radiator 1111 is located at the corner where the first segment 111a and the second segment 111b of the first border 111 connect.

[0087] A portion of the coupling branch 1211 is located in the first segment 121a of the second border 121, and another portion of the coupling branch 1211 is located in the second segment 121b. Alternatively, it can be understood that the coupling branch 1211 is located at the corner where the first segment 121a and the second segment 121b of the second border 121 connect.

[0088] It should be noted that in practical applications, the radiator 1111 also includes a feed point for connecting to the radio frequency circuit and a grounding point for grounding. When configuring the radiator 1111, a similar configuration can be made as described above, and will not be repeated here.

[0089] Correspondingly, the coupling stub 1211 also includes a connection point for connecting to the filter circuit and a grounding point for grounding. When configuring the coupling stub 1211, a similar configuration can be made with reference to the above-described coupling stub 1211, and will not be repeated here.

[0090] In summary, in practical applications, the radiator can be located on the straight edge of the first frame or at a corner of the first frame. Similarly, the coupling stub can be located on the straight edge of the second frame or at a corner of the second frame.

[0091] The above example is an exemplary illustration of a foldable device 10 including a radiator 1111 and a coupling stub 1211.

[0092] In other examples, the foldable device 10 may also include two or more radiators 1111, and each radiator 1111 may be equipped with a coupling branch 1211 coupled thereto. Among the multiple radiators 1111, the operating frequency bands of each radiator 1111 may be different. Alternatively, at least two radiators 1111 may exist with the same operating frequency band.

[0093] For example, such as Figure 17 and Figure 18 As shown, in one example provided in this application, the foldable device 10 includes two radiators and two coupling branches. The two radiators are radiator 1111a and radiator 1111b, and the two coupling branches are coupling branch 1211a and coupling branch 1211b. It should be noted that radiator 1111a and coupling branch 1211a are... Figure 4 and Figure 5 The radiator 1111 and coupling stub 1211 mentioned above, radiator 1111b and coupling stub 1211b are Figure 15 and Figure 16 The radiator 1111 and coupling stub 1211 mentioned in the text will not be elaborated here.

[0094] In summary, in practical applications, the radiator can be located on the straight edge of the first frame or at a corner of the first frame. Similarly, the coupling stub can be located on the straight edge of the second frame or at a corner of the second frame. Furthermore, the number of radiators and coupling stubs can be one, two, or more.

[0095] In specific configuration, the number, location, and operating frequency band of the radiators can be reasonably set according to actual needs. For example, the operating frequency band of radiator 1111a may include GPS, WIFI 2.4G, and WIFI 5G, etc. The operating frequency band of radiator 1111b may include 2.4G and 5G, etc.

[0096] Correspondingly, the number, location, and operating frequency band of the coupling branches can be reasonably set according to the corresponding coupled radiators, which will not be elaborated here.

[0097] In the various embodiments of this application, unless otherwise specified or in case of logical conflict, the terminology and / or descriptions of different embodiments are consistent and can be referenced by each other. The technical features of different embodiments can be combined to form new embodiments according to their inherent logical relationship.

[0098] In this application, "multiple" means two or more. "And / or" describes the relationship between related objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist simultaneously, or B exists alone, where A and B can be singular or plural.

[0099] It is understood that the various numerical designations used in the embodiments of this application are merely for descriptive convenience and are not intended to limit the scope of the embodiments of this application. The order of the process numbers described above does not imply the order of execution; the execution order of each process should be determined by its function and internal logic.

Claims

1. A foldable device, characterized in that, It includes a first housing and a second housing, which can be folded or unfolded relative to each other; The first housing includes a first frame, in which a radiator is included, the radiator having at least two resonant modes; The second housing includes a second frame, in which coupling stubs are included; The coupling stub includes a first end, a second end, and a grounding point. The first end is located at one end of the coupling stub, the second end is located at the other end of the coupling stub, and the grounding point is located between the first end and the second end. The foldable device further includes a first filter circuit, one end of which is connected to the coupling stub, and the other end of which is connected to a reference ground in the foldable device. The grounding point is also connected to the reference ground in the foldable device. Wherein, when the foldable device is in a folded state, in the thickness direction of the foldable device, the projection of the radiator and the coupling stub at least partially overlap, and the first filter circuit is used to couple the coupling stub with at least two resonant modes of the radiator.

2. The foldable device according to claim 1, characterized in that, The length between the grounding point and the first end is L1, and the length between the grounding point and the second end is L2; The ratio of L1 to L2 is greater than or equal to 1 / 3 and less than or equal to 3.

3. The foldable device according to claim 1 or 2, characterized in that, The projection of the radiator at least partially overlaps with the projection of the coupling stub, including: when the foldable device is in a folded state, in the thickness direction of the foldable device, the length of the overlapping portion of the projection of the radiator and the coupling stub is L3, and the length of the radiator is L0; Among them, L3 is greater than or equal to 1 / 2L0.

4. The foldable device according to claim 3, characterized in that, The length of the coupling stub is greater than the length of the radiator; When the foldable device is in a folded state, the projection of the radiator onto the coupling stub is located in the coupling stub in the thickness direction of the foldable device.

5. The foldable device according to any one of claims 1 to 4, characterized in that, The first filtering circuit is a bandpass filter circuit.

6. The foldable device according to any one of claims 1 to 5, characterized in that, The foldable device also includes a second filter circuit, one end of which is connected to the coupling stub, and the connection points of the first filter circuit and the second filter circuit on the coupling stub are located on both sides of the grounding point; Wherein, when the foldable device is in a folded state, in the thickness direction of the foldable device, the projection of the radiator and the coupling stub at least partially overlap, and the second filter circuit is used to couple the coupling stub with at least two resonant modes of the radiator.

7. The foldable device according to claim 6, characterized in that, The second filtering circuit is a bandpass filter circuit.

8. The foldable device according to any one of claims 1 to 7, characterized in that, The foldable device also includes a matching circuit; The matching circuit is connected to the first end and / or the second end of the coupling stub, and the matching circuit is used to adjust the operating frequency of the coupling stub.

9. The foldable device according to any one of claims 1 to 8, characterized in that, The first frame includes a plurality of the radiators, and the second frame includes a plurality of the coupling branches; When the foldable device is in a folded state, the plurality of radiators and the plurality of coupling branches are coupled one-to-one.

10. The foldable device according to any one of claims 1 to 9, characterized in that, The radiator is located at the corner of the first frame, and the coupling branch is located at the corner of the second frame.

11. The foldable device according to any one of claims 1 to 9, characterized in that, The radiator is located on the straight edge of the first frame, and the coupling stub is located on the straight edge of the second frame.

12. The foldable device according to any one of claims 1 to 11, characterized in that, The radiator includes a grounding point and a power supply point; The foldable device also includes a radio frequency circuit connected to the feed point, and the grounding point connected to a reference ground in the foldable device.

13. The foldable device according to any one of claims 1 to 12, characterized in that, The foldable device also includes a hinge connecting the first housing and the second housing, which are foldable or unfoldable relative to each other around the hinge.

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