Foldable electronic device

Abstract

The application provides a foldable electronic device, which comprises a first body part, a second body part, a third body part, a first rotating shaft, a second rotating shaft, a feed source, a radiation branch and a first parasitic branch. The first body part and the second body part are connected through the first rotating shaft, and the second body part and the third body part are connected through the second rotating shaft. The radiation branch is arranged at a first end of the first body part, and comprises a feed point connected with the feed source. The radiation branch works in a preset frequency band under the excitation of the feed source. The first parasitic branch is arranged at a second end of the second body part or a third end of the third body part. When the foldable electronic device is in a folded state, the first body part is located between the second body part and the third body part, the first parasitic branch is arranged close to and spaced from the radiation branch, and the feed source is coupled to excite the first parasitic branch through the radiation branch, so as to improve the radiation performance in the preset frequency band. The application can effectively improve the radiation performance in the preset frequency band.

Description

Technical Field

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

[0002] Currently, foldable electronic devices such as mobile phones are increasingly trending towards large screens and ultra-thin designs. However, as the screen size increases, the overall size becomes too large and inconvenient to carry. Folding solutions can solve this problem, providing both portability and a large screen display. Therefore, foldable electronic devices are gradually gaining popularity. Current foldable electronic devices often feature dual-folding screens, including two frame sections and a hinge connecting them. The two frame sections can rotate around the hinge to fold or unfold. With the widespread adoption of 5G communication technology, people's communication experience is improving. However, foldable electronic devices contain an increasing number of antennas. Due to the increasing prevalence of full-screen and curved screens, the available space for antennas is decreasing, and the spacing between antennas is also shrinking. Currently, some antennas in foldable electronic devices perform well when the device is unfolded, but when folded, their performance degrades due to the proximity of the frame sections caused by the folding mechanism. With the development of folding technology, three-fold screens have gradually emerged, which are foldable electronic devices consisting of three frame sections. However, when the three-fold screen is in the folded state, the impact on some antennas is more obvious. Summary of the Invention

[0003] This application provides a foldable electronic device to solve the above-mentioned problems.

[0004] In a first aspect, a foldable electronic device is provided, comprising a first body portion, a second body portion, a third body portion, a first pivot, a second pivot, a feed source, a radiating stub, and a first parasitic stub. The first pivot is connected between the first body portion and the second body portion, wherein the first body portion and the second body portion are rotatably connected via the first pivot. The second pivot is connected between the second body portion and the third body portion, wherein the second body portion and the third body portion are rotatably connected via the second pivot, and wherein the first pivot and the second pivot are parallel. The radiating stub is disposed at a first end of the first body portion, the radiating stub including a feed point connected to the feed source, and the radiating stub operating in a preset frequency band under the excitation of the feed source. The first parasitic stub is disposed at one of the second end of the second body portion and the third end of the third body portion; wherein the first end, the second end, and the third end have the same orientation and are all perpendicular to the first pivot and the second pivot. When the foldable electronic device is in a folded state, the first body part is located between the second body part and the third body part, and the first parasitic branch and the radiating branch are close to each other and spaced apart. The feed source excites the first parasitic branch through the radiating branch to improve the radiation performance of the preset frequency band.

[0005] The foldable electronic device of this application, by providing the radiating stub at a first end of the first body portion located between the second body portion and the third body portion when the foldable electronic device is in a folded state, and by providing the first parasitic stub at one of the second end of the second body portion and the third end of the third body portion, enables the feed source to enhance the radiation performance of the preset frequency band by coupling and exciting the first parasitic stub to perform coupled resonance through the radiating stub when the foldable electronic device is in a folded state. Attached Figure Description

[0006] To more clearly illustrate the technical solutions in the embodiments of this application or the background art, the accompanying drawings used in the embodiments of this application or the background art will be described below.

[0007] Figure 1 This is a plan view illustrating part of the internal structure of a foldable electronic device in some embodiments of this application when it is in an unfolded state.

[0008] Figure 2 This is a schematic diagram of a foldable electronic device in a folded state according to some embodiments of this application.

[0009] Figure 3This is a schematic diagram illustrating part of the internal structure of a foldable electronic device in some embodiments of this application when it is in a folded state.

[0010] Figure 4 This is a schematic diagram of the current distribution of the radiating stub and the first parasitic stub in some embodiments of the present application when the foldable electronic device is in a folded state.

[0011] Figure 5 This is another schematic diagram illustrating part of the internal structure of a foldable electronic device in a folded state according to some embodiments of this application.

[0012] Figure 6 This is another planar schematic diagram of the foldable electronic device in the unfolded state according to some embodiments of this application.

[0013] Figure 7 This is another schematic diagram illustrating part of the internal structure of a foldable electronic device in a folded state according to some embodiments of this application.

[0014] Figure 8 This is a schematic diagram showing the current distribution of the radiating branch, the first parasitic branch, and the second parasitic branch in some embodiments of the foldable electronic device when it is in a folded state.

[0015] Figure 9 This is another schematic diagram illustrating part of the internal structure of a foldable electronic device in a folded state according to some embodiments of this application.

[0016] Figure 10 This is yet another schematic diagram illustrating part of the internal structure of a foldable electronic device in a folded state according to some embodiments of this application.

[0017] Figure 11 This is a schematic diagram showing the return loss, overall system efficiency, and radiation efficiency curves of a foldable electronic device in both its unfolded and folded states.

[0018] Figure 12 This is a schematic diagram comparing the return loss and overall system efficiency curves of a foldable electronic device in some embodiments of this application with those of a reference foldable electronic device.

[0019] Figure 13 This is a simplified schematic diagram illustrating a portion of the structure of a foldable electronic device in some embodiments of this application.

[0020] Figure 14 The diagram illustrates a partial structure of the foldable electronic device in some embodiments of this application. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] In the description of the embodiments of this invention, it should be understood that the terms "upper," "lower," "thickness," "width," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not imply or indicate that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. The term "connection" in this application includes physical structural connection, electrical connection, direct connection, or indirect connection, etc., and can be specifically determined according to the required connection situation. In the description of the embodiments of this invention, the terms "first," "second," "third," etc., are not specific, but are used to distinguish objects with the same name. Where there is a specification, the objects with the same name referred to by the terms "first," "second," "third," etc., may be the same objects.

[0023] Please refer to the following: Figure 1 and Figure 2 , Figure 1 This is a plan view illustrating part of the internal structure of a foldable electronic device 100 in an unfolded state according to some embodiments of this application. Figure 2 This is a schematic diagram showing the foldable electronic device 100 in a folded state in some embodiments of this application. For example... Figure 1 and Figure 2As shown, the foldable electronic device 100 includes a first body part 1, a second body part 2, a third body part 3, a first rotating shaft 4, a second rotating shaft 5, a feed source 6, a radiating branch 7, and a first parasitic branch 8. The first rotating shaft 4 connects the first body part 1 and the second body part 2, wherein the first body part 1 and the second body part 2 are rotatably connected via the first rotating shaft 4. The second rotating shaft 5 connects the second body part 2 and the third body part 3, wherein the second body part 2 and the third body part 3 are rotatably connected via the second rotating shaft 5, wherein the first rotating shaft 4 and the second rotating shaft 5 are parallel. The radiating branch 7 is disposed at a first end 1D of the first body part 1, and the radiating branch 7 includes a feed point F1, which is connected to the feed source 6. The radiating branch 7 operates in a preset frequency band under the excitation of the feed source 6. The first parasitic branch 8 is disposed at one of the second end 2D of the second body portion 2 and the third end 3D of the third body portion 3; wherein the first end 1D, the second end 2D, and the third end 3D have the same orientation and are all perpendicular to the first rotating shaft 4 and the second rotating shaft 5. When the foldable electronic device 100 is in a folded state, the first body portion 1 is located between the second body portion 2 and the third body portion 3, and the first parasitic branch 8 is close to and spaced apart from the radiating branch 7. The feed source 6 couples and excites the first parasitic branch 8 through the radiating branch 7 to improve the radiation performance of the preset frequency band.

[0024] When the foldable electronic device 100 is in a folded state, the radiating branch 7 located in one of the main bodies is often affected by the other main bodies, resulting in a decrease in radiation performance. In this application, by setting the radiating branch 7 at the first end 1D of the first main body 1 located between the second main body 2 and the third main body 3 when the foldable electronic device 100 is in a folded state, and setting the first parasitic branch 8 at one of the second end 2D of the second main body 2 and the third end 3D of the third main body 3, the feed source 6 can be coupled and excited by the radiating branch 7 to achieve coupled resonance in the first parasitic branch 8 when the foldable electronic device 100 is in a folded state, thereby improving the radiation performance of the preset frequency band.

[0025] in, Figure 1 and Figure 2 The illustration is given with the first parasitic branch 8 located at the second end 2D of the second body part 2 as an example. Obviously, the first parasitic branch 8 can also be located at the third end 3D of the third body part 3.

[0026] In this application, the foldable electronic device 100 being in a folded state refers to a state where the included angle between the first body portion 1, the second body portion 2, and the third body portion 3 of the foldable electronic device 100 is 0°, that is, the first body portion 1, the second body portion 2, and the third body portion 3 are facing each other and fitting together. The foldable electronic device 100 being in an unfolded state refers to a state where the included angle between the first body portion 1, the second body portion 2, and the third body portion 3 of the foldable electronic device 100 is 180°.

[0027] In some embodiments, when the foldable electronic device 100 transitions from the unfolded state to the folded state, the first body part 1 is first rotated around the first pivot 4 in a first direction to be above and stacked with the second body part 2, and then the third body part 3 is rotated around the second pivot 5 in a second direction to be above the first body part 1 and stacked with the first body part 1, thereby forming a folded state. Figure 2 The second body portion 2, the first body portion 1, and the third body portion 3 are shown in a folded state, stacked sequentially. In some embodiments, the first direction and the second direction are opposite. For example, in... Figure 1 and Figure 2 From the perspective of [the observer], the first direction is clockwise, while the second direction is counterclockwise.

[0028] Please refer to the following: Figure 3 This is a schematic diagram illustrating part of the internal structure of the foldable electronic device 100 in some embodiments of this application when it is in a folded state. For example... Figure 1 and Figure 3 As shown, the radiating branch 7 includes a first grounding terminal 71 and a first open-circuit terminal 72. The first grounding terminal 71 is used for grounding. The first parasitic branch 8 includes a second grounding terminal 81 and a second open-circuit terminal 82. The second grounding terminal 81 is used for grounding. When the foldable electronic device 100 is in a folded state, the direction from the second grounding terminal 81 to the second open-circuit terminal 82 of the first parasitic branch 8 is approximately opposite to the direction from the first grounding terminal 71 to the first open-circuit terminal 72 of the radiating branch 7.

[0029] That is, in some embodiments, when the foldable electronic device 100 is in a folded state, the second grounding terminal 81 of the first parasitic branch 8 and the first open-circuit terminal 72 of the radiating branch 7 are located on the same side, while the second open-circuit terminal 82 of the first parasitic branch 8 and the first grounding terminal 71 of the radiating branch 7 are located on the other side.

[0030] The first open-circuit end 72 and the second open-circuit end 82 are in an open-circuit state, i.e., in a suspended state.

[0031] Please refer to the following: Figure 4 This is a schematic diagram showing the current distribution of the radiating stub 7 and the first parasitic stub 8 when the foldable electronic device 100 in some embodiments of this application is in a folded state. Figure 4 As shown, the radiating stub 7 generates a current I1 from the first ground terminal 71 to the first open terminal 72 under the excitation of the feed source 6. When the foldable electronic device 100 is in a folded state, when the feed source 6 excites the first parasitic stub 8 through the radiating stub 7, a current I2 will be generated in the first parasitic stub 8 from the second open terminal 82 to the second ground terminal 81. Since the direction from the second ground terminal 81 to the second open terminal 82 of the first parasitic stub 8 is approximately opposite to the direction from the first ground terminal 71 to the first open terminal 72 of the radiating stub 7, the current I2 from the second open terminal 82 to the second ground terminal 81 of the first parasitic stub 8 will be in the same direction as the current I1 from the first ground terminal 71 to the first open terminal 72 on the radiating stub 7. That is, a current in the same direction as the current on the radiating branch 7 is excited on the first parasitic branch 8. Since the currents are in the same direction, the radiation energy of the radiating branch 7 can be effectively enhanced, thereby effectively improving the radiation performance of the radiating branch 7.

[0032] in, Figure 3 and Figure 4 This can be a schematic diagram of the foldable electronic device 100 after the casing has been removed. For example... Figure 3 and Figure 4As shown, in some embodiments, the foldable electronic device 100 further includes a first middle frame 11, a second middle frame 21, and a third middle frame 31, wherein the first middle frame 11 may be located in the first body portion 1, the second middle frame 21 may be located in the second body portion 2, and the third middle frame 31 may be located in the third body portion 3. The first middle frame 11, the second middle frame 21, and the third middle frame 31 are all grounded. The first middle frame 11 includes a first side B1 approximately located at the first end portion 1D, the second middle frame 21 includes a second side B2 approximately located at the second end portion 2D, and the third middle frame 31 includes a third side B3 approximately located at the third end portion 3D. In some embodiments, the radial branch 7 disposed at the first end portion 1D of the first body portion 1 may specifically be disposed on one side of the first middle frame 11 located at the first end portion 1D, near the first side B1. The first parasitic branch 8 is disposed in one of the second end 2D of the second body part 2 and the third end 3D of the third body part 3, specifically it can be disposed on the second side B2 of the second middle frame 21 located at the second end 2D or on the third side B3 of the third middle frame 31 located at the third end 3D.

[0033] That is, in some embodiments, viewed from the inside of the foldable electronic device 100, the radiating branch 7 is specifically disposed on one side of the first middle frame 11 located at the first end 1D, and close to the first side B1 of the first middle frame 11. The first parasitic branch 8 is specifically disposed on one side of the second middle frame 21 located at the second end 2D, or on one side of the third middle frame 31 located at the third end 3D, and close to the second side B2 of the second middle frame 21 or the third side B3 of the third middle frame 31.

[0034] The first middle frame 11, the second middle frame 21 and the third middle frame 31 can be used as the overall ground of the foldable electronic device 100, and also as a carrier for some corresponding functional devices, such as a flexible display screen that carries the foldable electronic device 100.

[0035] In some embodiments, the second grounding terminal 82 of the first parasitic branch 8 is grounded by being electrically connected to the first middle frame 11, and the second grounding terminal 82 of the first parasitic branch 8 is grounded by being electrically connected to the second middle frame 21 of the second body portion 2 or the third middle frame 31 of the third body portion 3.

[0036] In some embodiments, such as Figures 1-3As shown, the radiating branch 7 and the first parasitic branch 8 are elongated. The first grounding end 71 and the first open circuit end 72 are the two opposite ends of the radiating branch 7 in the length direction. The second grounding end 81 and the second open circuit end 82 are the two opposite ends of the first parasitic branch 8 in the length direction. When the foldable electronic device 100 is in a folded state, the radiating branch 7 and the first parasitic branch 8 are approximately parallel.

[0037] That is, in some embodiments, when the foldable electronic device 100 is in a folded state, the radiating branch 7 is substantially parallel to the first parasitic branch 8. As a result, the current I2 from the second open terminal 82 of the first parasitic branch 8 to the second ground terminal 81 will be substantially parallel and in the same direction as the current I1 from the first ground terminal 71 to the first open terminal 72 on the radiating branch 7. This allows the current I2 generated in the first parasitic branch 8 to more effectively enhance the radiated energy of the radiating branch 7.

[0038] The statement that the radial branch 7 is approximately parallel to the first parasitic branch 8 means that the length direction of the radial branch 7 is approximately parallel to the length direction of the first parasitic branch 8. Specifically, the length direction of the radial branch 7 is the extension direction of its longest side, and the length direction of the first parasitic branch 8 is the extension direction of its longest side.

[0039] In some embodiments, the radial branch 7 and the first parasitic branch 8 are elongated, including straight strips or strips in a bent or curved state. When the radial branch 7 and the first parasitic branch 8 are straight strips, the longest side of the radial branch 7 and the first parasitic branch 8 is the longest straight side. When the radial branch 7 and the first parasitic branch 8 are bent or curved strips, the longest side of the radial branch 7 and the first parasitic branch 8 is the longest bent or curved side.

[0040] In some embodiments, the length direction of the radial branch 7 is substantially parallel to the length direction of the first end 1D, and the length direction of the first parasitic branch 8 is parallel to the length direction of the second end 2D or the third end 3D where the first parasitic branch 8 is located. When the foldable electronic device 100 is in a folded state, the length direction of the first end 1D is parallel to the length direction of the second end 2D or the third end 3D where the first parasitic branch 8 is located, thereby making the radial branch 7 substantially parallel to the first parasitic branch 8.

[0041] That is, in some embodiments, the radial branch 7 is disposed at the first end 1D of the first body part 1 and is substantially parallel to the length direction of the first end 1D, while the first parasitic branch 8 is disposed at the second end 2D of the second body part 2 or the third end 3D of the third body part 3 and is parallel to the length direction of the second end 2D or the third end 3D where it is disposed. Since, for the foldable electronic device 100, when the foldable electronic device 100 is in a folded state, the length directions of the first end 1D of the first body part 1, the second end 2D of the second body part 2, and the third end 3D of the third body part 3 are all in a roughly parallel state, by setting the radial branch 7 at the first end 1D of the first body part 1 and making it roughly parallel to the length direction of the first end 1D, and setting the first parasitic branch 8 at the second end 2D of the second body part 2 or the third end 3D of the third body part 3 and making it parallel to the length direction of the second end 2D or the third end 3D where the first parasitic branch 8 is set, when the foldable electronic device 100 is in a folded state, the radial branch 7 will be roughly parallel to the first parasitic branch 8.

[0042] Obviously, in other embodiments, the length direction of the radial branch 7 may not be parallel to the length direction of the first end 1D, and the length direction of the first parasitic branch 8 may not be parallel to the length direction of the second end 2D or the third end 3D where the first parasitic branch 8 is located. As long as the angle between the length direction of the radial branch 7 and the length direction of the first end 1D is the same as the angle between the length direction of the first parasitic branch 8 and the length direction of the second end 2D or the third end 3D where the first parasitic branch 8 is located, the radial branch 7 and the first parasitic branch 8 can be made to be approximately parallel when the foldable electronic device 100 is in a folded state.

[0043] The length directions of the first end 1D, the second end 2D, and the third end 3D can be the extension directions of the longest sides of the first end 1D, the second end 2D, and the third end 3D, respectively.

[0044] Please return to the reference. Figure 2 In some embodiments, such as Figure 2 As shown, the end face of the first end 1D of the first body 1, the end face of the second end 2D of the second body 2, and the end face of the third end 3D of the third body 3 are all rectangular.

[0045] Wherein, the first end 1D, the second end 2D, and the third end 3D have the same orientation, and the first end 1D, the second end 2D, and the third end 3D are all perpendicular to the first rotating shaft 4 and the second rotating shaft 5. This can mean that the end faces of the first end 1D, the second end 2D, and the third end 3D have the same orientation, and are all perpendicular to the axes of the first rotating shaft 4 and the second rotating shaft 5. Wherein, the aforementioned parallelism of the first rotating shaft 4 and the second rotating shaft 5 can mean that the axes of the first rotating shaft 4 and the second rotating shaft 5 are parallel.

[0046] In some embodiments, the radial branch 7 and the first parasitic branch 8 are flat and elongated. The surface with the largest area of ​​the radial branch 7 is parallel to the end face of the first end 1D of the first body part 1, and the surface with the largest area of ​​the first parasitic branch 8 is parallel to the end face of the second end 2D of the second body part 2 or the third end 3D of the third body part 3.

[0047] In some embodiments, the fact that the length direction of the radial branch 7 is approximately parallel to the length direction of the first parasitic branch 8 means that the included angle between them is within a preset angle range and does not need to be strictly parallel. For example, the included angle between the length direction of the radial branch 7 and the length direction of the first parasitic branch 8 can be within ±10°, etc. The fact that the length direction of the radial branch 7 is parallel to the length direction of the first end 1D, and the length direction of the first parasitic branch 8 is parallel to the length direction of the second end 2D or the third end 3D where the first parasitic branch 8 is located, can also mean that the included angle between the length direction of the radial branch 7 and the length direction of the first end 1D is within a preset angle range, and the included angle between the length direction of the first parasitic branch 8 and the length direction of the second end 2D or the third end 3D where the first parasitic branch 8 is located is within a preset angle range.

[0048] In some embodiments, the electrical length of the radiating stub 7 is λ / 4, where λ is the wavelength corresponding to the preset frequency band. Therefore, by designing the electrical length of the radiating stub 7 to be λ / 4, it can resonate well within the preset frequency band.

[0049] In some embodiments, the electrical length of the radiating branch 7 is approximately equal to the length of the radiating branch 7, that is, the length of the radiating branch 7 from the first ground terminal 71 to the first open terminal 72.

[0050] In some embodiments, such as Figure 1 and Figure 3As shown in the figure, the feed point F1 is located between the first ground terminal 71 and the first open terminal 72, thus forming an IFA (Inverted F antenna). The portion of the radiating stub 7 from the first ground terminal 71 to the first open terminal 72 participates in radiation; therefore, the electrical length of the radiating stub 7 is approximately equal to its total length.

[0051] In some embodiments, the electrical length of the first parasitic branch 8 is less than the electrical length of the radiating branch 7. In some embodiments, the electrical length of the first parasitic branch 8 is approximately equal to the length of the first parasitic branch 8, that is, the length of the first parasitic branch 8 from the second ground terminal 81 to the second open terminal 82.

[0052] In some embodiments, the first parasitic stub 8 mainly resonates in the higher-order mode, such as the second-order mode, in the preset frequency band. Therefore, the electrical length of the first parasitic stub 8 is less than the electrical length of the radiating stub 7.

[0053] When the first parasitic stub 8 resonates in the higher-order mode of the preset frequency band, the overall radiation efficiency of the preset frequency band can be improved, thereby enhancing the radiation performance of the radiation stub 7.

[0054] In some embodiments, the electrical length of the first parasitic branch 8 is less than λ / 4 and greater than or equal to λ / 8. That is, in some embodiments, the electrical length of the first parasitic branch 8 is less than the electrical length of the radiating branch 7, and may be less than λ / 4 and greater than or equal to λ / 8.

[0055] Please see Figure 5 This is another schematic diagram illustrating a portion of the internal structure of a foldable electronic device 100 in a folded state according to some embodiments of this application. In some embodiments, such as Figure 5 As shown, the foldable electronic device 100 further includes a first matching unit M1, which is connected between the second grounding terminal 81 of the first parasitic branch 8 and the ground. The first matching unit M1 is used for matching adjustment, and the sum of the equivalent electrical length of the first matching unit M1 and the electrical length of the first parasitic branch 8 is less than λ / 4 and greater than or equal to λ / 8.

[0056] That is, in some embodiments, the foldable electronic device 100 further includes a first matching unit M1 connected between the second grounding terminal 81 of the first parasitic stub 8 and ground. The first matching unit M1 can be equivalent to a portion of the electrical length. Therefore, the sum of the equivalent electrical length of the first matching unit M1 and the electrical length of the first parasitic stub 8 only needs to satisfy the requirement of resonance in the higher-order mode of the preset frequency band. In other words, when the foldable electronic device 100 includes the first matching unit M1, the sum of the equivalent electrical length of the first matching unit M1 and the electrical length of the first parasitic stub 8 is approximately equal to the electrical length of the first parasitic stub 8 when the foldable electronic device 100 does not include the first matching unit M1.

[0057] In some embodiments, the sum of the equivalent electrical length of the first matching unit M1 and the electrical length of the first parasitic branch 8 also satisfies less than λ / 4 and greater than or equal to λ / 8.

[0058] The first matching unit M1 may include a capacitor and / or an inductor. In some embodiments, the first matching unit M1 may include an inductor or present an inductive reactance. Since the equivalent electrical length of an inductor is positive, the length of the first parasitic branch 8 can be shortened, which helps to reduce the overall size. In other embodiments, the first matching unit M1 may also include a capacitor or present a capacitive reactance. Since the equivalent electrical length of a capacitor is negative, the length of the first parasitic branch 8 can be longer, even exceeding the length of the radiating branch 7, thereby increasing the overall structural strength as needed. Therefore, by adding the first matching unit M1, the design of the first parasitic branch 8 can be flexible.

[0059] Please see Figure 6 This is another planar schematic diagram of the foldable electronic device 100 in its unfolded state according to some embodiments of this application. Figure 6 As shown, the foldable electronic device 100 also includes a second parasitic branch 9, which is disposed in the other of the second end portion 2D of the second body portion 2 and the third end portion 3D of the third body portion 3. When the foldable electronic device 100 is in a folded state, the second parasitic branch 9 is close to and spaced apart from the radiating branch 7, and the feed source 6 excites the second parasitic branch 9 through the radiating branch 7 to further improve the radiation performance of the preset frequency band.

[0060] That is, in some embodiments, the foldable electronic device 100 includes, in addition to the first parasitic branch 8 disposed on one of the second end 2D of the second body portion 2 and the third end 3D of the third body portion 3, a second parasitic branch 9 disposed on the other of the second end 2D of the second body portion 2 and the third end 3D of the third body portion 3. Since the first body portion 1 is located between the second body portion 2 and the third body portion 3 when the foldable electronic device 100 is in a folded state, the radiating branch 7 disposed on the first end 1D of the first body portion 1 will be located between the first parasitic branch 8 disposed on one of the second body portion 2 and the third body portion 3 and the second parasitic branch 9 disposed on the other of the second body portion 2 and the third body portion 3. Therefore, the feed source 6 can simultaneously couple and excite the first parasitic branch 8 and the second parasitic branch 9 through the radiating branch 7, thereby further improving the radiation performance of the preset frequency band.

[0061] in, Figure 6 The illustration shows an example where the first parasitic branch 8 is located at the second end 2D of the second body portion 2, and the second parasitic branch 9 is located at the third end 3D of the third body portion 3. Obviously, in some embodiments, the first parasitic branch 8 may also be located at the third end 3D of the third body portion 3, and the second parasitic branch 9 may also be located at the second end 2D of the second body portion 2.

[0062] Please refer to the following: Figure 7 This is another schematic diagram illustrating a portion of the internal structure of a foldable electronic device in a folded state according to some embodiments of this application. As previously mentioned, the foldable electronic device 100 further includes the second parasitic branch 9. Figure 6 and Figure 7 As shown, the second parasitic branch 9 includes a third grounding terminal 91 and a third open-circuit terminal 92. The third grounding terminal 91 is used for grounding. When the foldable electronic device 100 is in a folded state, the direction from the third grounding terminal 91 to the third open-circuit terminal 92 of the second parasitic branch 9 is opposite to the direction from the first grounding terminal 71 to the first open-circuit terminal 72 of the radiating branch 7.

[0063] That is, in some embodiments, when the foldable electronic device 100 is in a folded state, the third grounding terminal 91 of the second parasitic branch 9 is on the same side as the first open-circuit terminal 72 of the radiating branch 7, while the third open-circuit terminal 92 of the second parasitic branch 9 and the first grounding terminal 71 of the radiating branch 7 are on the other side.

[0064] Among them, the third open end 92 of the second parasitic branch 9 is in an open state, that is, in a suspended state.

[0065] It should be noted that the first grounding terminal 71, the second grounding terminal 81, and the third grounding terminal 91 are the ends of the radiating branch 7, the first parasitic branch 8, and the second parasitic branch 9, respectively, and are all used for grounding. However, the specific grounding location can be these three ends, or it can be near the corresponding end and not necessarily at the end.

[0066] As mentioned above Figure 6 As shown, when the foldable electronic device 100 is in the unfolded state, the direction from the second grounding end 81 to the second open circuit end 82 of the first parasitic branch 8 is approximately the same as the direction from the first grounding end 71 to the first open circuit end 72 of the radiating branch 7, and the direction from the third grounding end 91 to the third open circuit end 92 of the second parasitic branch 9 is approximately opposite to the direction from the first grounding end 71 to the first open circuit end 72 of the radiating branch 7. As mentioned above, when the foldable electronic device 100 transitions from the unfolded state to the folded state, the first body part 1 is first rotated around the first pivot 4 in a first direction to be above the second body part 2 and stacked with the second body part 2, and then the third body part 3 is rotated around the second pivot 5 in a second direction to be above the first body part 1 and stacked with the first body part 1, thereby forming a folded state in which the second body part 2, the first body part 1, and the third body part 3 are stacked in sequence. Therefore, when the first body part 1 rotates around the first pivot 4 in the first direction to be above the second body part 2 and stacked with the second body part 2, the direction from the second ground end 81 to the second open end 82 of the first parasitic branch 8 is approximately opposite to the direction from the first ground end 71 to the first open end 72 of the radiating branch 7. Since the third body part 3 rotates around the second pivot 5 in the second direction to be above the first body part 1, it is equivalent to maintaining the relative position relationship with the first body part 1 in the unfolded state of the foldable electronic device 100. Therefore, the direction from the third ground end 91 to the third open end 92 of the second parasitic branch 9 is approximately opposite to the direction from the first ground end 71 to the first open end 72 of the radiating branch 7.

[0067] Please refer to the following: Figure 8 This is a schematic diagram showing the current distribution of the radiating branch 7, the first parasitic branch 8, and the second parasitic branch 9 when the foldable electronic device 100 in some embodiments of this application is in a folded state. Figure 8As shown, the radiating stub 7 generates a current I1 from the first ground terminal 71 to the first open terminal 72 under the excitation of the feed source 6. When the foldable electronic device 100 is in a folded state, when the feed source 6 excites the first parasitic stub 8 through the radiating stub 7, a current I2 will be generated in the first parasitic stub 8 from the second open terminal 82 of the first parasitic stub 8 to the second ground terminal 81, and a current I3 will also be generated in the second parasitic stub 9 from the third open terminal 92 of the second parasitic stub 9 to the third ground terminal 91. Since the direction from the second grounding terminal 81 to the second open circuit terminal 82 of the first parasitic branch 8 is approximately opposite to the direction from the first grounding terminal 71 to the first open circuit terminal 72 of the radiating branch 7, and the direction from the third grounding terminal 91 to the third open circuit terminal 92 of the second parasitic branch 9 is also opposite to the direction from the first grounding terminal 71 to the first open circuit terminal 72 of the radiating branch 7, the current I2 from the second open circuit terminal 82 to the second grounding terminal 81 of the first parasitic branch 8, and the current I3 from the third open circuit terminal 92 to the third grounding terminal 91 of the second parasitic branch 9 will be in the same direction as the current I1 from the first grounding terminal 71 to the first open circuit terminal 72 on the radiating branch 7. That is, both the first parasitic branch 8 and the second parasitic branch 9 will generate currents in the same direction as the current on the radiating branch 7. Since the currents are in the same direction, the radiation energy of the radiating branch 7 can be effectively enhanced. Compared with only the first parasitic branch 8, the radiation performance of the radiating branch 7 can be further improved.

[0068] Among them, such as Figure 7 and Figure 8 As shown, in some embodiments, the radial branch 7 disposed at the first end 1D of the first body portion 1 may specifically be disposed on one side of the first side B1 of the first middle frame 11 located at the first end 1D. The first parasitic branch 8 disposed at one of the second end 2D of the second body portion 2 and the third end 3D of the third body portion 3 may specifically be disposed on one side of the second middle frame 21 located at the second side B2 of the second end 2D or on one side of the third middle frame 31 located at the third end 3D. The second parasitic branch 9 disposed at the other of the second end 2D of the second body portion 2 and the third end 3D of the third body portion 3 may specifically be disposed on one side of the third middle frame 31 located at the third side B3 of the third end 3D or on one side of the second middle frame 21 located at the second end 2D of the second end 2D.

[0069] In some embodiments, the third grounding terminal 92 of the second parasitic branch 9 is grounded by being electrically connected to the second middle frame 21 of the second body portion 2 or the third middle frame 31 of the third body portion 3.

[0070] In some embodiments, such as Figure 7 and Figure 8 As shown in the figure, the second parasitic branch 9 is also elongated. The third grounding end 91 and the third open end 92 are the two opposite ends of the second parasitic branch 9 in the length direction. When the foldable electronic device 100 is in a folded state, the second parasitic branch 9 is parallel to the radiating branch 7.

[0071] That is, in some embodiments, when the foldable electronic device 100 is in a folded state, the second parasitic branch 9 is also approximately parallel to the radiating branch 7. As a result, the current I3 from the third open terminal 92 of the second parasitic branch 9 to the third ground terminal 91 will be substantially parallel and in the same direction as the current I1 from the first ground terminal 71 to the first open terminal 72 on the radiating branch 7. This allows the current I2 generated in the second parasitic branch 9 to more effectively enhance the radiated energy of the radiating branch 7.

[0072] The statement that the second parasitic branch 9 is approximately parallel to the radial branch 7 means that the length direction of the second parasitic branch 9 is approximately parallel to the length direction of the radial branch 7. The length direction of the second parasitic branch 9 is the extension direction of the longest side of the first parasitic branch 8, and the length direction of the radial branch 7 is the extension direction of the longest side of the radial branch 7, as mentioned above.

[0073] In some embodiments, the second parasitic segment 9 is elongated, including elongated segments that are straight, bent, or curved. When the second parasitic segment 9 is straight, its longest side is the longest straight side. When the second parasitic segment 9 is bent or curved, its longest side is the longest bent or curved side.

[0074] In some embodiments, the length direction of the radiating branch 7 is substantially parallel to the length direction of the first end 1D, the length direction of the first parasitic branch 8 is parallel to the length direction of the second end 2D or the third end 3D where the first parasitic branch 8 is located, and the length direction of the second parasitic branch 9 is parallel to the length direction of the third end 3D or the second end 2D where the second parasitic branch 9 is located. When the foldable electronic device 100 is in a folded state, the length direction of the first end 1D is parallel to the length directions of the second end 2D and the third end 3D, thereby making the radiating branch 7 substantially parallel to the first parasitic branch 8 and the second parasitic branch 9.

[0075] Obviously, similarly, in other embodiments, the length direction of the radial branch 7 may not be parallel to the length direction of the first end 1D, the length direction of the first parasitic branch 8 may not be parallel to the length direction of the second end 2D or the third end 3D where the first parasitic branch 8 is located, and the length direction of the second parasitic branch 9 may not be parallel to the length direction of the third end 3D or the second end 2D where the second parasitic branch 9 is located. As long as the angle between the length direction of the radial branch 7 and the length direction of the first end 1D, the angle between the length direction of the first parasitic branch 8 and the length direction of the first parasitic branch 8 where the first parasitic branch 8 is located, and the angle between the length direction of the second parasitic branch 9 and the length direction of the second parasitic branch 9 where the second parasitic branch 9 is located are all the same, it is possible to make the radial branch 7, the first parasitic branch 8, and the second parasitic branch 9 approximately parallel when the foldable electronic device 100 is in a folded state.

[0076] The length directions of the first end 1D, the second end 2D, and the third end 3D can be the extension directions of the longest sides of the first end 1D, the second end 2D, and the third end 3D, respectively.

[0077] In some embodiments, the second parasitic branch 9 may also be a flat, elongated shape, and the surface with the largest area of ​​the second parasitic branch 9 is parallel to the end face of the third end 3D of the third body portion 3 or the second end 2D of the second body portion 2.

[0078] As mentioned above, in some embodiments, the electrical length of the radiating stub 7 is λ / 4, where λ is the wavelength corresponding to the preset frequency band. Therefore, by designing the electrical length of the radiating stub 7 to be λ / 4, it can resonate well within the preset frequency band.

[0079] In some embodiments, the electrical length of the second parasitic branch 9 is less than the electrical length of the radiating branch 7. In some embodiments, the electrical length of the second parasitic branch 9 is approximately equal to the length of the second parasitic branch 9, that is, the length of the second parasitic branch 9 from the third ground terminal 91 to the third open terminal 92.

[0080] In some embodiments, the second parasitic stub 9 primarily resonates in higher-order modes, such as the second-order mode, within the preset frequency band. Therefore, the electrical length of the second parasitic stub 9 is less than the electrical length of the radiating stub 7.

[0081] When the second parasitic stub 9 resonates in the higher-order mode of the preset frequency band, the overall radiation efficiency of the preset frequency band can be further improved, thereby further enhancing the radiation performance of the radiation stub 7.

[0082] In some embodiments, the electrical length of the second parasitic branch 9 is less than λ / 4 and greater than or equal to λ / 8, where λ is the wavelength corresponding to the preset frequency band. That is, in some embodiments, the electrical length of the second parasitic branch 9 is less than the electrical length of the radiating branch 7, and may be less than λ / 4 and greater than or equal to λ / 8.

[0083] Please see Figure 9 This is another schematic diagram illustrating part of the internal structure of the foldable electronic device 100 in a folded state in some embodiments of this application. Figure 9 As shown, the foldable electronic device 100 further includes a second matching unit M2, which is connected between the third grounding terminal 91 of the second parasitic branch 9 and the ground. The second matching unit M2 is used for matching adjustment, and the sum of the equivalent electrical length of the second matching unit M2 and the electrical length of the second parasitic branch 9 is less than λ / 4 and greater than or equal to λ / 8.

[0084] That is, in some embodiments, the foldable electronic device 100 further includes a second matching unit M2 connected between the third grounding terminal 91 of the second parasitic stub 9 and ground. The second matching unit M2 can be equivalent to a portion of the electrical length. Therefore, the sum of the equivalent electrical length of the second matching unit M2 and the electrical length of the second parasitic stub 9 only needs to satisfy the requirement of resonance in the higher-order mode of the preset frequency band. In other words, when the foldable electronic device 100 includes the second matching unit M1, the sum of the equivalent electrical length of the second matching unit M1 and the electrical length of the second parasitic stub 9 is approximately equal to the electrical length of the second parasitic stub 9 when the foldable electronic device 100 does not include the second matching unit M2.

[0085] In some embodiments, as described above, the sum of the equivalent electrical length of the second matching unit M2 and the electrical length of the second parasitic branch 9 also satisfies less than λ / 4 and greater than or equal to λ / 8.

[0086] The second matching unit M2 may include a capacitor and / or an inductor. In some embodiments, the first matching unit M2 may include an inductor or present an inductive reactance. Since the equivalent electrical length of an inductor is positive, the length of the second parasitic branch 9 can be shortened, which helps to reduce the overall size. In other embodiments, the second matching unit M2 may also include a capacitor or present a capacitive reactance. Since the equivalent electrical length of a capacitor is negative, the length of the second parasitic branch 9 can be longer, even exceeding the length of the radiating branch 7, thereby increasing the overall structural strength as needed. Therefore, by adding the second matching unit M2, the design of the second parasitic branch 9 can be flexible.

[0087] Among them, the aforementioned Figure 7 and Figure 8 The illustration is given with the foldable electronic device 100 excluding the first matching unit M1 and the second matching unit M2 as an example. Figure 9 The illustration takes the example of the foldable electronic device 100, which may simultaneously include the first matching unit M1 and the second matching unit M2.

[0088] Obviously, in some embodiments, the foldable electronic device 100 may include only the first matching unit M1 connected between the second ground terminal 81 of the first parasitic branch 8 and ground, without including the second matching unit M2 connected between the third ground terminal 91 of the second parasitic branch 9 and ground; or, the foldable electronic device 100 may include only the second matching unit M2 connected between the third ground terminal 91 of the second parasitic branch 9 and ground, without including the first matching unit M1 connected between the second ground terminal 81 of the first parasitic branch 8 and ground.

[0089] In some embodiments, such as Figures 2-3 As shown in the figure, the length of the first parasitic branch 8 can be less than the length of the radiating branch 7, and when the foldable electronic device 100 is in a folded state, the second grounding end 81 of the first parasitic branch 8 is approximately flush with the first open end 72 of the radiating branch 7. That is, when the foldable electronic device 100 is in a folded state, the projection of the second grounding end 81 of the first parasitic branch 8 onto the radiating branch 7 is approximately coincident with the first open end 72 of the radiating branch 7.

[0090] In some embodiments, such as Figures 7-9As shown in the figure, when the foldable electronic device 100 further includes the second parasitic branch 9, the length of the second parasitic branch 9 can also be less than the length of the radiating branch 7. Furthermore, when the foldable electronic device 100 is in a folded state, the second grounding terminal 81 of the first parasitic branch 8 and the third grounding terminal 91 of the second parasitic branch 9 are approximately aligned with the first open-circuit terminal 72 of the radiating branch 7. That is, when the foldable electronic device 100 is in a folded state, the projection of the second grounding terminal 81 of the first parasitic branch 8 onto the radiating branch 7 approximately coincides with the first open-circuit terminal 72 of the radiating branch 7, and the projection of the third grounding terminal 91 of the second parasitic branch 9 onto the radiating branch 7 also approximately coincides with the first open-circuit terminal 72 of the radiating branch 7.

[0091] Therefore, by setting the second grounding terminal 81 of the first parasitic branch 8 and the third grounding terminal 91 of the second parasitic branch 9 to be approximately flush with the first open-circuit terminal 72 of the radiating branch 7, the endpoints of the current flowing through the first parasitic branch 8, the second parasitic branch 9 and the radiating branch 7 can be made to be approximately the same, thereby increasing the radiation energy and improving the radiation efficiency to a certain extent.

[0092] Please see Figure 10 This is another schematic diagram illustrating a portion of the internal structure of the foldable electronic device 100 in a folded state according to some embodiments of this application. In some embodiments, when the foldable electronic device 100 further includes the first matching unit M1 and / or the second matching unit M2, as mentioned above, since the first matching unit M1 and / or the second matching unit M2 can be equivalent to a certain electrical length, the length of the first parasitic branch 8 and / or the second parasitic branch 9 is not limited. For example, as... Figure 10 As shown, the foldable electronic device 100 includes both the first matching unit M1 and the second matching unit M2. The length of the first parasitic branch 8 may be longer than that of the radiating branch 7, while the length of the second parasitic branch 9 may be approximately equal to that of the radiating branch 7.

[0093] In some embodiments, such as Figure 10 As shown, the second grounding terminal 81 of the first parasitic branch 8 and the third grounding terminal 91 of the second parasitic branch 9 may not be flush with the first open-circuit terminal 72 of the radiating branch 7. In some embodiments, such as Figure 10 As shown, the second grounding end 81 of the first parasitic branch 8 can also extend to the connection between the first middle frame 11 and the second middle frame 21, that is, to the position corresponding to the first rotating shaft 4.

[0094] Therefore, as mentioned above, by adding the first matching unit M2 and the second matching unit M2, the design of the first parasitic branch 8 and the second parasitic branch 9 can be flexibly modified.

[0095] In some embodiments, the preset frequency band is a low-frequency band.

[0096] Please see Figure 11 This is a schematic diagram showing the return loss, overall system efficiency, and radiation efficiency curves of a reference foldable electronic device in both its unfolded and folded states. The reference foldable electronic device is a foldable electronic device excluding the first parasitic stub 8 and the second parasitic stub 9. Figure 11 The return loss, total system efficiency, and radiation efficiency curves of the radiating branch 7 when operating in the preset frequency band are obtained by simulation tests conducted with the reference foldable electronic device in both the unfolded and folded states.

[0097] in, Figure 11 The diagram illustrates the return loss curve S11-1, the system total efficiency curve St1, and the radiation efficiency curve Sr1 of the reference foldable electronic device in its unfolded state, as well as the return loss curve S11-2, the system total efficiency curve St2, and the radiation efficiency curve Sr2 of the reference foldable electronic device in its folded state.

[0098] Generally, the trough of the return loss curve is also the peak of the system's overall efficiency curve St1 and radiation efficiency curve Sr1, and the corresponding frequency is the resonant frequency of the operating frequency band. As mentioned above, in some embodiments, the preset frequency band is a low-frequency band, with a frequency range of approximately 700MHz to 800MHz, and a resonant frequency of approximately 750MHz.

[0099] like Figure 11 As shown, at the resonant frequency of the preset frequency band, the return loss of the reference foldable electronic device in the unfolded state is approximately -10dB, the total system efficiency is approximately -3dB, and the radiation efficiency is approximately -2dB. In contrast, the return loss of the reference foldable electronic device in the folded state is approximately -5dB, the total system efficiency is approximately -7dB, and the radiation efficiency is approximately -4dB.

[0100] Therefore, it can be seen that when the reference foldable electronic device does not include the first parasitic stub 8 and the second parasitic stub 9, the return loss of the reference foldable electronic device in the folded state is increased by approximately 5 dB compared to the return loss of the reference foldable electronic device in the unfolded state, indicating a significant increase in loss. The overall system efficiency of the reference foldable electronic device in the folded state is decreased by approximately 4 dB compared to the overall system efficiency of the reference foldable electronic device in the unfolded state, and the radiation efficiency of the reference foldable electronic device in the folded state is decreased by approximately 2 dB compared to the radiation efficiency of the reference foldable electronic device in the unfolded state. Both the overall system efficiency and the radiation efficiency have decreased to a certain extent.

[0101] Therefore, when the reference foldable electronic device does not include the first parasitic branch 8 and the second parasitic branch 9, the radiation performance of the radiating branch 7 is significantly reduced in the folded state compared to the unfolded state of the reference foldable electronic device.

[0102] Please see Figure 12 This is a schematic diagram comparing the return loss and overall system efficiency curves of the foldable electronic device 100 in some embodiments of this application with those of the reference foldable electronic device. The reference foldable electronic device, as mentioned above, is a foldable electronic device excluding the first parasitic stub 8 and the second parasitic stub 9. Figure 12 This includes return loss and overall system efficiency curves of the radiating stub 7 operating in the preset frequency band, obtained from simulation tests conducted with the reference foldable electronic device in both unfolded and folded states. It also includes return loss and overall system efficiency curves of the radiating stub 7 operating in the preset frequency band, obtained from simulation tests conducted with the foldable electronic device 100 in some embodiments of this application in its folded state. Specifically, in some embodiments, the return loss and overall system efficiency curves of the radiating stub 7 operating in the preset frequency band, obtained from simulation tests conducted with the foldable electronic device 100 in its folded state, include: when the foldable electronic device 100 includes only the first parasitic stub 8, the return loss and overall system efficiency curves of the radiating stub 7 operating in the preset frequency band, obtained from simulation tests conducted with the foldable electronic device 100 in its folded state; and when the foldable electronic device 100 includes both the first parasitic stub 8 and the second parasitic stub 9, the return loss and overall system efficiency curves of the radiating stub 7 operating in the preset frequency band, obtained from simulation tests conducted with the foldable electronic device 100 in its folded state.

[0103] Right now, Figure 12The diagram illustrates the return loss curve S11-1 and the system total efficiency curve St1 of the reference foldable electronic device in its unfolded state, the return loss curve S11-2 and the system total efficiency curve St2 of the reference foldable electronic device in its folded state, the return loss S11-3 and the system total efficiency curve St3 obtained from simulation tests when the foldable electronic device 100 includes only the first parasitic stub 8 and is in its folded state, and the return loss S11-4 and the system total efficiency curve St4 obtained from simulation tests when the foldable electronic device 100 includes both the first parasitic stub 8 and the second parasitic stub 9 and is in its folded state.

[0104] As mentioned above, and also as Figure 12 As shown, at the resonant frequency of the preset frequency band, the return loss of the reference foldable electronic device in its unfolded state is approximately -10dB, and the overall system efficiency is approximately -3dB. Conversely, the return loss of the reference foldable electronic device in its folded state is approximately -5dB, and the overall system efficiency is approximately -7dB. Figure 12 As shown, at the resonant frequency of the preset frequency band, when the foldable electronic device 100 includes only the first parasitic stub 8, the return loss in the folded state is approximately -7dB, and the overall system efficiency is approximately -6dB. When the foldable electronic device 10 includes both the first parasitic stub 8 and the second parasitic stub 9, the return loss in the folded state is approximately -8dB, and the overall system efficiency is approximately -3.5dB.

[0105] It is evident that adding one parasitic stub can effectively reduce return loss and improve the overall system efficiency, while adding two parasitic stubs can significantly reduce return loss and improve the overall system efficiency, and achieves almost the same radiation performance as the foldable electronic device in its unfolded state, thus greatly improving radiation performance.

[0106] Among them, as mentioned above Figure 2 As shown in the figure, in any of the above embodiments, the foldable electronic device 100 may further include a third matching unit M3, which is connected between the feed source 6 and the feed point F1 of the radiating stub 7, and is used to perform impedance matching adjustment on the radiating stub 7 so as to better resonate at the resonant frequency corresponding to the preset frequency band.

[0107] Please see Figure 13 This is a simplified schematic diagram illustrating a portion of the structure of the foldable electronic device 100 in some embodiments of this application. Figure 13As shown, the foldable electronic device 100 includes both the first parasitic branch 8 and the second parasitic branch 9, and also includes a first grounding switch SW1 and a second grounding switch SW2. The first grounding switch SW1 is connected between the second grounding terminal 81 of the first parasitic branch 8 and ground, and is used to connect or disconnect the connection between the second grounding terminal 81 of the first parasitic branch 8 and ground. The second grounding switch SW2 is connected between the third grounding terminal 91 of the second parasitic branch 9 and ground, and is used to connect or disconnect the connection between the third grounding terminal 91 of the second parasitic branch 9 and ground. When the first grounding switch SW1 is on, the second grounding terminal 81 of the first parasitic branch 8 is connected to ground, and the first parasitic branch 8 is enabled to improve the radiation performance of the preset frequency band under the coupling excitation of the feed source 6. When the second grounding switch SW2 is on, the third grounding terminal 91 of the second parasitic branch 9 is connected to ground, and the second parasitic branch 9 is enabled to improve the radiation performance of the preset frequency band under the coupling excitation of the feed source 6.

[0108] In some embodiments, when the first grounding switch SW1 is open, the connection between the second grounding terminal 81 of the first parasitic stub 8 and the ground is broken. Both ends of the first parasitic stub 8 are open circuits, effectively non-existent. That is, the first parasitic stub 8 is disabled and will not resonate in the higher-order mode of the preset frequency band under the coupling excitation of the feed source 6, thus not affecting the radiation performance of the radiating stub 7. Similarly, when the second grounding switch SW2 is open, the connection between the third grounding terminal 91 of the second parasitic stub 9 and the ground is broken. Both ends of the second parasitic stub 9 are open circuits, effectively non-existent. That is, the second parasitic stub 9 is disabled and enabled and will not resonate in the higher-order mode of the preset frequency band under the coupling excitation of the feed source 6, thus not affecting the radiation performance of the radiating stub 7.

[0109] Therefore, in some embodiments, the first grounding switch SW1 and the second grounding switch SW2 can enable or disable the first parasitic branch 8 and the second parasitic branch 9 as needed, which can meet the needs of different scenarios.

[0110] Among them, such as Figure 13As shown, when the foldable electronic device 100 further includes the first matching unit M1 and the second matching unit M2, the first grounding switch SW1 may specifically be connected between the second grounding terminal 81 of the first parasitic branch 8 and the first matching unit M1, or connected between the first matching unit M1 and ground; the second grounding switch SW2 may specifically be connected between the third grounding terminal 91 of the second parasitic branch 9 and the second matching unit M2, or connected between the second matching unit M2 and ground. Figure 13 The illustration is given with the first grounding switch SW1 connected between the first matching unit M1 and ground, and the second grounding switch SW2 connected between the second matching unit M2 and ground as an example.

[0111] Please refer to the following: Figure 14 This is a structural block diagram illustrating a portion of the structure of a foldable electronic device 100 in some embodiments of this application. For example... Figure 13 as well as Figure 14 As shown, the foldable electronic device 100 also includes a controller 10, which is connected to the first grounding switch SW1 and the second grounding switch SW2. The controller 10 is used to control the first grounding switch SW1 to be turned on and the second grounding switch SW2 to be turned off when the first preset condition is met; to control the second grounding switch SW2 to be turned on and the first grounding switch SW1 to be turned off when the second preset condition is met; and to control the first grounding switch SW1 and the second grounding switch SW2 to be turned on simultaneously when the third preset condition is met.

[0112] That is, the controller 10 can control at least one of the first grounding switch SW1 and the second grounding switch SW2 to be turned on when different preset conditions are met.

[0113] In some embodiments, the first preset condition includes detecting a human body approaching the second parasitic segment 9, the second preset condition includes detecting a human body approaching the first parasitic segment 8, and the third preset condition includes detecting a human body approaching both the first parasitic segment 8 and the second parasitic segment 9.

[0114] That is, in some embodiments, the controller 10 can control the first grounding switch SW1 to turn on and the second grounding switch SW2 to turn off when a human body is detected approaching the second parasitic branch 9; and control the second grounding switch SW2 to turn on and the first grounding switch SW1 to turn off when a human body is detected approaching the first parasitic branch 8; and control the first grounding switch SW1 and the second grounding switch SW2 to turn on simultaneously when a human body is detected approaching both the first parasitic branch 8 and the second parasitic branch 9.

[0115] When a human body approaches the second parasitic branch 9, its contribution to radiation efficiency decreases due to the influence of the human body. Therefore, the first grounding switch SW1 can be turned on and the second grounding switch SW2 can be turned off, enabling the first parasitic branch 8 and disabling the second parasitic branch 9. This allows the coupled energy to be concentrated on the side of the first parasitic branch 8 that is not blocked by the human body, thus improving radiation performance while avoiding the influence of the human body. Similarly, when a human body approaches the first parasitic branch 8, its contribution to radiation efficiency decreases due to the influence of the human body. Therefore, the second grounding switch SW2 can be turned on and the first grounding switch SW1 can be turned off, enabling the second parasitic branch 9 and disabling the first parasitic branch 8. This allows the coupled energy to be concentrated on the side of the second parasitic branch 9 that is not blocked by the human body, thus improving radiation performance while avoiding the influence of the human body. When a human body approaches both the first parasitic branch 8 and the second parasitic branch 9 simultaneously, both branches will be affected by the human body. At this time, controlling the first grounding switch SW1 and the second grounding switch SW2 to conduct simultaneously can maximize the radiation performance of the radiating branch 7.

[0116] In some embodiments, the foldable electronic device 100 may default to having both the first grounding switch SW1 and the second grounding switch SW2 turned on, thereby controlling one of the first grounding switches SW1 and the second grounding switch SW2 to turn off, or controlling both the first grounding switch SW1 and the second grounding switch SW2 to remain on, depending on the different situations where a human body is detected approaching.

[0117] In some embodiments, such as Figure 14 As shown, the foldable electronic device 100 includes a first sensing element 20 and a second sensing element 30. The first sensing element 20 is correspondingly disposed with the first parasitic branch 8 and is used to generate a sensing signal when a human body approaches. The second sensing element 30 is correspondingly disposed with the second parasitic branch 9 and is used to generate a sensing signal when a human body approaches. The controller 10 is connected to the first sensing element 20 and the second sensing element 30. When the controller 10 receives the sensing signal generated by the first sensing element 20, it determines that a human body has approached the first parasitic branch 8. When the controller 10 receives the sensing signal generated by the second sensing element 30, it determines that a human body has approached the second parasitic branch 9.

[0118] That is, in some embodiments, the foldable electronic device 100 includes a first sensing element 20 and a second sensing element 30, and the controller 10 uses the first sensing element 20 and the second sensing element 30 to detect and determine whether a human body is close to the first parasitic branch 8 and whether a human body is close to the second parasitic branch 9, respectively.

[0119] In some embodiments, both the first sensing element 20 and the second sensing element 30 are metallic conductors. Since the human body is also a conductor, when the human body approaches the first sensing element 20 or the second sensing element 30, a coupling capacitance is generated between the human body and the first sensing element 20 or the second sensing element 30, causing a change in the charge of the first sensing element 20 or the second sensing element 30, thereby generating the sensing signal, which can be a current signal or a voltage signal.

[0120] In some embodiments, the first sensing element 20 reuses the first parasitic branch 8, and the second sensing element 30 reuses the second parasitic branch 9. That is, in some embodiments, since both the first parasitic branch 8 and the second parasitic branch 9 are metallic conductors, the first parasitic branch 8 can be reused as the first sensing element 20, and the second parasitic branch 9 can be reused as the second sensing element 30, thereby saving costs and reducing size.

[0121] Among them, the aforementioned radiating branch 7 is also a metallic conductor.

[0122] In some embodiments, at least one of the first sensing element 20 and the second sensing element 30 may also be a metal body in the electronic device of the foldable electronic device 100. That is, in some embodiments, at least one of the first sensing element 20 and the second sensing element 30 may reuse the metal body in the electronic device originally included in the electronic device 100. The metal body in the electronic device includes at least one of mechanical buttons, fingerprint modules, receivers, speaker modules, metal structures in wireless charging structures, metal decorative rings of cameras, metal plates on circuit board supports, metal card trays, and nanocrystalline or ceramic ferrite in NFC modules. Specifically, when the first sensing element 20 and the second sensing element 30 are metal bodies in the electronic device of the foldable electronic device 100, the first sensing element 20 may specifically be a metal body in the electronic device close to the first parasitic branch 8, and the second sensing element 30 may specifically be a metal body in the electronic device close to the second parasitic branch 9.

[0123] In some embodiments, the controller 10 may include two data receiving pins, which are respectively connected to the first sensing element 20 and the second sensing element 30. When the data receiving pin connected to the first sensing element 20 receives a sensing signal, the controller 10 determines that it has received a sensing signal generated by the first sensing element 30, and when the data receiving pin connected to the second sensing element 30 receives a sensing signal, it determines that it has received a sensing signal generated by the second sensing element 30.

[0124] In some embodiments, the controller 10 can determine the target sensing element corresponding to the data receiving pin that receives the sensing signal according to a preset correspondence between receiving pins and sensing elements, and further determine the target parasitic branch corresponding to the target sensing element according to a preset correspondence between sensing elements and parasitic branches, thereby determining that the parasitic branch currently approached by the human body is the target parasitic branch, and controlling the execution of the aforementioned operations, thereby controlling the first grounding switch SW1 and the second grounding switch SW2 to be turned on or off accordingly.

[0125] In some embodiments, the foldable electronic device 100 may further include a memory 40, which may be used to store the aforementioned correspondences, namely, a preset correspondence between receiving pins and sensing elements and a preset correspondence between sensing elements and parasitic branches.

[0126] In other embodiments, the first preset condition may further include detecting a decrease in radiation performance in one direction of the first parasitic branch 8, the second preset condition includes detecting a decrease in radiation performance in one direction of the second parasitic branch 9, and the third preset condition includes detecting a decrease in radiation performance in both one direction of the first parasitic branch 8 and one direction of the second parasitic branch 9.

[0127] That is, in some other embodiments, the controller 10 can control the first grounding switch SW1 and the second grounding switch SW2 to be disconnected accordingly based on whether the radiation performance in the direction of the first parasitic branch 8 and the direction of the second parasitic branch 9 located in the radiating branch 7 has decreased, so as to improve the radiation performance.

[0128] In some other embodiments, the foldable electronic device 100 may default to either having both the first grounding switch SW1 and the second grounding switch SW2 disconnected or controlling only one of them to be on. Thus, depending on the different radiation performance conditions, it may control one of the first grounding switches SW1 and the second grounding switch SW2 to be on or kept on, or control both the first grounding switch SW1 and the second grounding switch SW2 to be on.

[0129] The first grounding switch SW1 and the second grounding switch SW2 can be digitally controlled switches, such as MOSFETs, BJT transistors, etc. The controller 10 can control the first grounding switch SW1 and the second grounding switch SW2 to be turned on or off by outputting corresponding level signals to the first grounding switch SW1 and the second grounding switch SW2.

[0130] Please return to the reference. Figure 1 Attached figures, such as Figure 1 As shown, the foldable electronic device 100 also includes a frame 200, which surrounds the foldable electronic device 100. Specifically, the radial branch 7 is disposed at the frame 200 located at the first end 1D of the first body portion 1, the first parasitic branch 8 is disposed at the frame 200 located at one of the second end 2D of the second body portion 2 and the third end 3D of the third body portion 3, and the third parasitic branch 9 is disposed at the other of the frame 200 located at the second end 2D of the second body portion 2 and the third end 3D of the third body portion 3.

[0131] Among them, such as Figure 1 As shown in the accompanying drawings, the frame 200 includes a first sub-frame 201 located at a first end 1D of the first body portion 1, a second sub-frame 202 located at a second end 2D of the second body portion 2, and a third sub-frame 203 located at a third end 3D of the third body portion 3. Figure 1 As shown, the radiating branch 7 can be disposed on the first sub-border 201, the first parasitic branch 8 can be disposed on the second sub-border 202, and the second parasitic branch 9 can be disposed on the third sub-border 203.

[0132] In some embodiments, the frame 200 of the foldable electronic device 100 is a metal frame, the radiating branch 7 is formed by a metal frame located at the first end 1D of the first body portion 1, the first parasitic branch 8 is formed by a metal frame located at one of the second end 2D of the second body portion 2 and the third end 1D of the third body portion 3, and the third parasitic branch 9 is formed by a metal frame located at the other of the second end 2D of the second body portion 2 and the third end 1D of the third body portion 3.

[0133] That is, the radiating branch 7, the first parasitic branch 8, and the second parasitic branch 9 are three independent metal frame segments formed by opening the gaps in the metal frame of the foldable electronic device 100. For example, the radiating branch 7 is an independent metal frame segment formed by opening the gaps in the first sub-frame 201, the first parasitic branch 8 is an independent metal frame segment formed by opening the gaps in the second sub-frame 202, and the second parasitic branch 9 is an independent metal frame segment formed by opening the gaps in the third sub-frame 203.

[0134] In other embodiments, the frame 200 of the foldable electronic device 100 is a non-metallic frame, the radiating branch 7 is a metal segment disposed in the frame 200 of the first end 1D of the first body portion 1, the first parasitic branch 8 is a metal segment disposed in the frame 200 of one of the second end 2D of the second body portion 2 and the third end 3D of the third body portion 3, and the second parasitic branch 9 is a metal segment disposed in the frame 200 of the other of the second end 2D of the second body portion 2 and the third end 3D of the third body portion 3.

[0135] That is, the radiating branch 7, the first parasitic branch 8, and the second parasitic branch 9 are metal segments disposed in the frame of the foldable electronic device 100. For example, the radiating branch 7 is a metal segment disposed in the first sub-frame 201, the first parasitic branch 8 is a metal segment disposed in the second sub-frame 202, and the second parasitic branch 9 is a metal segment disposed in the third sub-frame 203.

[0136] That is, in other embodiments, the frame 200 of the foldable electronic device 100 may also be a non-metallic frame with low conductivity, such as plastic, ceramic, etc. The radiating branch 7, the first parasitic branch 8, and the second parasitic branch 9 are metal segments disposed in the frame 200 of the foldable electronic device 100.

[0137] Wherein, when the frame 200 of the foldable electronic device 100 can also be a non-metallic frame with low conductivity such as plastic, ceramic, etc., the radiating branch 7, the first parasitic branch 8 and the second parasitic branch 9 can be embedded in the frame 200 of the foldable electronic device 100 or disposed on the inner side of the frame 200 of the foldable electronic device 100.

[0138] In some embodiments, the foldable electronic device 100 further includes an antenna bracket made of insulating material. The radiating branch 7, the first parasitic branch 8, and the second parasitic branch 9 may be fixed to the corresponding antenna bracket and fixed to the electronic device near the frame 200 by the antenna bracket.

[0139] For example, the radiating branch 7, the first parasitic branch 8, and the second parasitic branch 9 may be an FPC (flexible printed circuit) fixed on the antenna support or an LDS (Laser-Direct-structuring) metal segment formed on the antenna support by laser technology, or a PDS metal segment formed on the antenna support by PDS (Printing Direct Structure) technology (e.g., forming a metal segment by printing conductive ink, conductive silver paste, etc. on the antenna support), and fixed to the electronic device 100 by the antenna support.

[0140] That is, in some embodiments, the radiating branch 7, the first parasitic branch 8 and the second parasitic branch 9 are fixedly disposed on the antenna bracket formed of insulating material, and then fixed to the electronic device 100 by the antenna bracket.

[0141] In some embodiments, the antenna support may be made of LCP (Liquid Crystal Polymer). In other embodiments, the antenna support may be made of other insulating materials, such as plastics, resins, rubber, etc.

[0142] In some embodiments, the first end portion 1D of the first body portion 1, the second end portion 2D of the second body portion 2, and the third end portion 3D of the third body portion 3 may be ends located at the bottom of the foldable electronic device 100. As mentioned above, the radial branch 7, the first parasitic branch 8, and the second parasitic branch 9 may be disposed at the bottom of the foldable electronic device 100. Obviously, in some embodiments, the first end portion 1D of the first body portion 1, the second end portion 2D of the second body portion 2, and the third end portion 3D of the third body portion 3 may be ends located at the top of the foldable electronic device 100. As mentioned above, the radial branch 7, the first parasitic branch 8, and the second parasitic branch 9 may be disposed at the top of the foldable electronic device 100.

[0143] In this application, the use of directional terms such as "top" and "bottom" in describing the foldable electronic device 100 is primarily based on the orientation of the user holding and using the foldable electronic device 100. "Top" refers to the position facing the top of the foldable electronic device 100, and "bottom" refers to the position facing the bottom of the foldable electronic device 100. This does not indicate or imply that the device or component must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation on the orientation of the foldable electronic device 100 in actual application scenarios. In some embodiments, the bottom end of the foldable electronic device 100 is the end with a headphone jack and a USB port, and the top end of the foldable electronic device 100 is the other end opposite to the end with the headphone jack and USB port, or it may refer to the end with a camera, receiver, etc.

[0144] The foldable electronic device 100 described in this application can be any foldable electronic device with an antenna, such as a foldable mobile phone or a foldable computer.

[0145] The controller 10 can be a central processing unit, microcontroller, single-chip microcomputer, digital signal processor, etc., and the memory 40 can be a flash memory card, hard disk, USB flash drive, etc.

[0146] In this application, by providing the radiating branch 7 at the first end 1D of the first body part 1 located between the second body part 2 and the third body part 3 when the foldable electronic device 100 is in a folded state, and by providing the first parasitic branch 8 at one of the second end 2D of the second body part 2 and the third end 3D of the third body part 3, the feed source 6 can enhance the radiation performance of the preset frequency band by coupling and exciting the first parasitic branch 8 through the radiating branch 7 to achieve coupled resonance when the foldable electronic device 100 is in a folded state.

[0147] Each embodiment of this application has its own emphasis. For elements that are not described in detail in a certain embodiment, please refer to the corresponding descriptions in other embodiments.

[0148] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Where there is no conflict, the embodiments and features in the embodiments of this application can be combined with each other. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A foldable electronic device, characterized by, The application relates to a foldable electronic device, comprising: a first body part; a second body part; a third body part; a first rotating shaft connected between the first body part and the second body part, wherein the first body part and the second body part are rotationally connected through the first rotating shaft; a second rotating shaft connected between the second body part and the third body part, wherein the second body part and the third body part are rotationally connected through the second rotating shaft, and the first rotating shaft and the second rotating shaft are parallel; a feed source; a radiation branch provided at a first end of the first body part, the radiation branch comprising a feed point connected to the feed source, and the radiation branch working at a preset frequency band under the excitation of the feed source; a first parasitic branch provided at one of a second end of the second body part and a third end of the third body part, wherein the first end, the second end and the third end are in the same direction, and the first end, the second end and the third end are perpendicular to the first rotating shaft and the second rotating shaft; when the foldable electronic device is in a folded state, the first body part is located between the second body part and the third body part, the first parasitic branch is arranged close to and spaced from the radiation branch, the feed source is coupled to excite the first parasitic branch through the radiation branch, and the radiation performance of the preset frequency band is improved; the first parasitic branch comprises a second grounding end and a second open end, the second grounding end is used for grounding, and the foldable electronic device further comprises a first grounding switch connected between the second grounding end of the first parasitic branch and the ground, and used for turning on or turning off the connection between the second grounding end of the first parasitic branch and the ground; the foldable electronic device further comprises a controller and a second parasitic branch, the second parasitic branch is provided at the other one of the second end of the second body part and the third end of the third body part, and the controller is connected to the first grounding switch and used for controlling the first grounding switch to be turned on when a first preset condition is met, and the first preset condition comprises detecting that a human body is close to the second parasitic branch.

2. The foldable electronic device of claim 1, wherein, The radiation branch comprises a first grounding end and a first open end, the first grounding end is used for grounding, when the foldable electronic device is in the folded state, the direction from the second grounding end to the second open end of the first parasitic branch is opposite to the direction from the first grounding end to the first open end of the radiation branch.

3. The foldable electronic device of claim 2, wherein, The radiation branch and the first parasitic branch are long strips, the first grounding end and the first open end are opposite ends in the length direction of the radiation branch, the second grounding end and the second open end are opposite ends in the length direction of the first parasitic branch, and when the foldable electronic device is in the folded state, the radiation branch and the first parasitic branch are parallel.

4. The foldable electronic device of claim 3, wherein, The electric length of the radiation branch is lambda / 4, wherein lambda is the wavelength corresponding to the preset frequency band.

5. The foldable electronic device of claim 4, wherein, The electric length of the first parasitic branch is less than lambda / 4 and greater than or equal to lambda / 8.

6. The foldable electronic device of claim 4, wherein, The foldable electronic device further comprises a first matching unit connected between the second ground terminal of the first parasitic branch and the ground, the first matching unit being used for matching adjustment, and an equivalent electrical length of the first matching unit and an electrical length of the first parasitic branch are less than λ / 4 and greater than or equal to λ / 8.

7. The foldable electronic device of any of claims 1-6, wherein, When the foldable electronic device is in the folded state, the second parasitic branch is arranged close to and spaced from the radiation branch, and the feed source further excites the second parasitic branch through the radiation branch to improve the radiation performance of the preset frequency band.

8. The foldable electronic device of claim 7, wherein, The second parasitic branch comprises a third ground terminal and a third open terminal, the third ground terminal being used for grounding; when the foldable electronic device is in the folded state, a direction from the third ground terminal to the third open terminal of the second parasitic branch is opposite to a direction from the first ground terminal to the first open terminal of the radiation branch.

9. The foldable electronic device of claim 8, wherein, The second parasitic branch is long strip-shaped, the third ground terminal and the third open terminal are opposite ends in a length direction of the second parasitic branch, and when the foldable electronic device is in the folded state, the second parasitic branch is parallel to the radiation branch.

10. The foldable electronic device of claim 9, wherein, An electrical length of the second parasitic branch is less than λ / 4 and greater than or equal to λ / 8, where λ is a wavelength corresponding to the preset frequency band.

11. The foldable electronic device of claim 9, wherein, The foldable electronic device further comprises a second matching unit connected between the third ground terminal of the second parasitic branch and the ground, the second matching unit being used for matching adjustment, and an equivalent electrical length of the second matching unit and an electrical length of the second parasitic branch are less than λ / 4 and greater than or equal to λ / 8.

12. The foldable electronic device of claim 7, wherein, The foldable electronic device further comprises a second ground switch connected between the third ground terminal of the second parasitic branch and the ground, and used for turning on or off the connection between the third ground terminal of the second parasitic branch and the ground; when the first ground switch is turned on, the second ground terminal of the first parasitic branch is connected to the ground, the first parasitic branch is enabled to improve the radiation performance of the preset frequency band under the coupling excitation of the feed source, and when the second ground switch is turned on, the third ground terminal of the second parasitic branch is connected to the ground, the second parasitic branch is enabled to improve the radiation performance of the preset frequency band under the coupling excitation of the feed source.

13. The foldable electronic device of claim 12, wherein, The controller is further connected to the second ground switch, the controller controls the second ground switch to be turned off when the first ground switch is turned on under the condition that a first preset condition is met, controls the second ground switch to be turned on and controls the first ground switch to be turned off under the condition that a second preset condition is met, and controls the first ground switch and the second ground switch to be turned on simultaneously under the condition that a third preset condition is met.

14. The foldable electronic device of claim 13, wherein, The second preset condition comprises detecting that a human body is close to the first parasitic branch, and the third preset condition comprises detecting that a human body is close to the first parasitic branch and the second parasitic branch.

15. The foldable electronic device of claim 14, wherein, The foldable electronic device comprises a first sensing element and a second sensing element, the first sensing element is arranged corresponding to the first parasitic branch, for sensing the inductive signal generated when the human body is close, the second sensing element is arranged corresponding to the second parasitic branch, for sensing the inductive signal generated when the human body is close, the controller is connected with the first sensing element and the second sensing element, the controller determines that the human body is close to the first parasitic branch when receiving the inductive signal generated by the first sensing element, the controller determines that the human body is close to the second parasitic branch when receiving the inductive signal generated by the second sensing element.

16. The foldable electronic device of claim 15, wherein, The first sensing element is a reuse of the first parasitic branch, and the second sensing element is a reuse of the second parasitic branch.

17. The foldable electronic device of claim 1, wherein, The preset frequency band is a low frequency band.

18. The foldable electronic device of claim 7, wherein, The foldable electronic device comprises a frame, the radiation branch is arranged at the frame of the first end of the first body part, the first parasitic branch is arranged at the frame of one of the second end of the second body part and the third end of the third body part, and the second parasitic branch is arranged at the frame of the other of the second end of the second body part and the third end of the third body part.

19. The foldable electronic device of claim 18, wherein, The frame of the foldable electronic device is a metal frame, the radiation branch is formed by the metal frame at the first end of the first body part, the first parasitic branch is formed by the metal frame at one of the second end of the second body part and the third end of the third body part, and the second parasitic branch is formed by the metal frame at the other of the second end of the second body part and the third end of the third body part.

20. The foldable electronic device of claim 18, wherein, The frame of the foldable electronic device is a non-metal frame, the radiation branch is a metal segment arranged in the frame of the first end of the first body part, the first parasitic branch is a metal segment arranged in the frame of one of the second end of the second body part and the third end of the third body part, and the second parasitic branch is a metal segment arranged in the frame of the other of the second end of the second body part and the third end of the third body part.

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