Foldable electronic device

Abstract

The invention provides foldable electronic equipment 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 knot and a first parasitic branch knot. The first body part and the second body part are rotationally connected through a first rotating shaft, and the second body part and the third body part are rotationally connected through a second rotating shaft. The radiation branch knot is arranged at the first end part of the first body part and comprises a feeding point connected with the feed source, and the radiation branch knot works in a preset frequency band under the excitation of the feed source. The first parasitic branch knot is arranged at the second end part of the second body part or the third end part of the third body part. Wherein when the foldable electronic equipment 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 knot and the radiation branch knot are close to each other and are arranged at an interval, and the feed source excites the first parasitic branch knot through coupling of the radiation branch knot, so that the radiation performance of the preset frequency band is improved. The radiation performance of the preset frequency band can be effectively improved.

Description

Technical Field

[0001] The present application relates to the field of terminals, and in particular to a foldable electronic device. Background Art

[0002] At present, foldable electronic devices such as mobile phones are increasingly tending to develop in the direction of large screens and ultra-thinness. However, as the screen increases, the size of the whole machine is too large and inconvenient to carry. This problem can be solved by a folding solution, that is, it is easy to carry and can achieve large-screen display. Therefore, foldable foldable electronic devices are gradually emerging. The current foldable electronic devices have double folding screens, including two frame parts and a rotating shaft connecting the two frame parts, and the two frame parts can be rotated around the rotating shaft to achieve folding or unfolding. With the popularization of 5G communication technology, people's communication experience is getting better and better, but the number of antennas included in foldable electronic devices is increasing. Due to the gradual popularization of full-screen and curved screens, the clearance space left for antennas is getting smaller and smaller, and the intervals between antennas are getting smaller and smaller. At present, some antennas in foldable electronic devices have better performance when the foldable electronic device is unfolded, and when the foldable electronic device is in a folded state, these antennas will be affected by the frame parts that are close to each other due to folding, resulting in a decrease in antenna performance. With the development of folding technology, there are gradually three-fold screens, that is, foldable electronic devices consisting of three frame parts. However, when the three-fold screen is in a folded state, the impact on some antennas is more obvious. Summary of the invention

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

[0004] In a first aspect, a foldable electronic device is provided, the foldable electronic device comprising a first body portion, a second body portion, a third body portion, a first rotating shaft, a second rotating shaft, a feed source, a radiation branch and a first parasitic branch. The first rotating shaft is connected between the first body portion and the second body portion, wherein the first body portion and the second body portion are rotationally connected through the first rotating shaft. The second rotating shaft is connected between the second body portion and the third body portion, wherein the second body portion and the third body portion are rotationally connected through the second rotating shaft, wherein the first rotating shaft and the second rotating shaft are parallel. The radiation branch is arranged at the first end of the first body portion, the radiation branch comprises a feeding point, the feeding point is connected to the feed source, and the radiation branch operates in a preset frequency band under the excitation of the feed source. The first parasitic branch is arranged 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 the first end, the second end and the third end are all perpendicular to the first rotating shaft and the second rotating shaft. Wherein, when the foldable electronic device is in a folded state, the first main body portion is located between the second main body portion and the third main body portion, and the first parasitic branch is close to and spaced from the radiation branch, and the feed source excites the first parasitic branch through coupling with the radiation branch to improve the radiation performance of the preset frequency band.

[0005] The foldable electronic device of the present application, by arranging the radiation branch at the first end of the first main body part located between the second main body part and the third main body part when the foldable electronic device is in a folded state, and arranging the first parasitic branch at the second end of the second main body part and one of the third ends of the third main body part, can improve the radiation performance of the preset frequency band by allowing the feed source to excite the first parasitic branch to couple and resonate through the radiation branch when the foldable electronic device is in a folded state. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the background technology, the drawings required for use in the embodiments of the present application or the background technology will be described below.

[0007] Figure 1 The present invention is a plan view schematically showing part of the internal structure of a foldable electronic device in some embodiments of the present application when the foldable electronic device is in an unfolded state.

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

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

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

[0011] Figure 5 Another schematic diagram illustrating part of the internal structure of a foldable electronic device in some embodiments of the present application when it is in a folded state.

[0012] Figure 6 Another plan view of the foldable electronic device in some embodiments of the present application in an unfolded state.

[0013] Figure 7 Another schematic diagram illustrating part of the internal structure of a foldable electronic device in some embodiments of the present application when it is in a folded state.

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

[0015] Fig. 9 This is another schematic diagram illustrating part of the internal structure of a foldable electronic device in some embodiments of the present application when it is in a folded state.

[0016] Fig.10 This is another schematic diagram illustrating part of the internal structure of a foldable electronic device in some embodiments of the present application when it is in a folded state.

[0017] Fig.11 It is a schematic diagram of the return loss, system total efficiency and radiation efficiency curves of a reference foldable electronic device in the unfolded state and the folded state.

[0018] Fig.12 A schematic diagram comparing the return loss and total system efficiency curves of the foldable electronic device in some embodiments of the present application and the reference foldable electronic device.

[0019] Fig.13 A simplified schematic diagram illustrating a partial structure of a foldable electronic device in some embodiments of the present application.

[0020] Fig.14 A structural block diagram illustrating a partial structure of a foldable electronic device in some embodiments of the present application. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

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

[0023] Please also read Figure 1 and Figure 2 , Figure 1 This is a schematic plan view showing a part of the internal structure of the foldable electronic device 100 in some embodiments of the present application in an unfolded state. Figure 2 FIG. 1 is a schematic diagram of a foldable electronic device 100 in some embodiments of the present application in a folded state. 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 radiation branch 7, and a first parasitic branch 8. The first rotating shaft 4 is connected between the first body part 1 and the second body part 2, wherein the first body part 1 and the second body part 2 are rotationally connected through the first rotating shaft 4. The second rotating shaft 5 is connected between the second body part 2 and the third body part 3, wherein the second body part 2 and the third body part 3 are rotationally connected through the second rotating shaft 5, wherein the first rotating shaft 4 and the second rotating shaft 5 are parallel. The radiation branch 7 is arranged at the first end 1D of the first body part 1, and the radiation branch 7 includes a feeding point F1, and the feeding point F1 is connected to the feed source 6. The radiation branch 7 works 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 part 2 and the third end 3D of the third body part 3; wherein the first end 1D, the second end 2D and the third end 3D are oriented in the same direction and the first end 1D, the second end 2D and the third end 3D are 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 part 1 is located between the second body part 2 and the third body part 3, and the first parasitic branch 8 is close to and spaced from the radiation branch 7, and the feed source 6 excites the first parasitic branch 8 through the radiation branch 7 to improve the radiation performance of the preset frequency band.

[0024] Among them, when the foldable electronic device 100 is in a folded state, the radiation branch 7 located in one of the main body parts is often affected by other main body parts, resulting in a decrease in radiation performance. In the present application, by setting the radiation branch 7 at the first end 1D of the first main body part 1 between the second main body part 2 and the third main body part 3 when the foldable electronic device 100 is in a folded state, and setting the first parasitic branch 8 at the second end 2D of the second main body part 2 and one of the third end 3D of the third main body part 3, when the foldable electronic device 100 is in a folded state, the feed source 6 can couple the radiation branch 7 to excite the first parasitic branch 8 to couple and resonate, thereby improving the radiation performance of the preset frequency band.

[0025] in, Figure 1 and Figure 2 In the figure, the first parasitic branch 8 is arranged at the second end 2D of the second main body portion 2 as an example for illustration. Obviously, the first parasitic branch 8 can also be arranged at the third end 3D of the third main body portion 3.

[0026] In this application, the foldable electronic device 100 is in a folded state, which means that the angle between the first body part 1, the second body part 2 and the third body part 3 of the foldable electronic device 100 is 0°, that is, the first body part 1, the second body part 2 and the third body part 3 are opposite to each other and in contact with each other. The foldable electronic device 100 is in an unfolded state, which means that the angle between the first body part 1, the second body part 2 and the third body part 3 of the foldable electronic device 100 is 180°.

[0027] In some embodiments, when the foldable electronic device 100 is converted from the unfolded state to the folded state, the first body portion 1 is first rotated around the first rotation axis 4 along the first direction to the top of the second body portion 2 and is stacked with the second body portion 2, and then the third body portion 3 is rotated around the second rotation axis 5 along the second direction to the top of the first body portion 1 and is stacked with the first body portion 1, so as to form a foldable electronic device 100 as shown in FIG. Figure 2 The second body portion 2, the first body portion 1 and the third body portion 3 are in a folded state in which they are stacked in sequence. In some embodiments, the first direction is opposite to the second direction. For example, Figure 1 and Figure 2 In the perspective of the present invention, the first direction is clockwise and the second direction is counterclockwise.

[0028] Please also read Figure 3 , is a schematic diagram illustrating a portion of the internal structure of the foldable electronic device 100 in some embodiments of the present application when the foldable electronic device 100 is in a folded state. Figure 1 and Figure 3 As shown, the radiation branch 7 includes a first grounding end 71 and a first open end 72, the first grounding end 71 is used for grounding, and the first parasitic branch 8 includes a second grounding end 81 and a second open end 82, the second grounding end 81 is used for grounding; when the foldable electronic device 100 is in a folded state, the direction from the second grounding end 81 of the first parasitic branch 8 to the second open end 82 is approximately opposite to the direction from the first grounding end 71 of the radiation branch 7 to the first open end 72.

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

[0030] The first open end 72 and the second open end 82 are in an open state, that is, a suspended state.

[0031] Please also read Figure 4 , is a schematic diagram of current distribution of the radiation branch 7 and the first parasitic branch 8 when the foldable electronic device 100 in some embodiments of the present application is in a folded state. Figure 4 As shown, the radiation branch 7 generates a current I1 from the first ground terminal 71 to the first open circuit terminal 72 under the stimulation of the feed source 6. When the foldable electronic device 100 is in a folded state, when the feed source 6 stimulates the first parasitic branch 8 through the radiation branch 7, a current I2 from the second open circuit terminal 82 of the first parasitic branch 8 to the second ground terminal 81 will be stimulated in the first parasitic branch 8. Since the direction from the second ground terminal 81 of the first parasitic branch 8 to the second open circuit terminal 82 is substantially opposite to the direction from the first ground terminal 71 of the radiation branch 7 to the first open circuit terminal 72, the current I2 from the second open circuit terminal 82 of the first parasitic branch 8 to the second ground terminal 81 will be the same as the direction of the current I1 from the first ground terminal 71 to the first open circuit terminal 72 on the radiation branch 7. That is, the first parasitic branch 8 excites a current in the same direction as the current on the radiation branch 7. Since the currents are in the same direction, the radiation energy of the radiation branch 7 can be effectively enhanced, thereby effectively improving the radiation performance of the radiation branch 7.

[0032] in, Figure 3 and Figure 4 It can be a schematic diagram of the foldable electronic device 100 without the housing. 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 1D, the second middle frame 21 includes a second side B2 approximately located at the second end 2D, and the third middle frame 31 includes a third side B3 approximately located at the third end 3D. In some embodiments, the radiation branch 7 is disposed at the first end 1D of the first body portion 1, and may be disposed on a side of the first side B1 of the first middle frame 11 located at the first end 1D. The first parasitic branch 8 is arranged at one of the second end 2D of the second main body portion 2 and the third end 3D of the third main body portion 3, and specifically can be arranged on the side of the second side B2 of the second end 2D of the second middle frame 21 or on the side of the third side B3 of the third middle frame 31 located at the third end 3D.

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

[0034] Among them, the first middle frame 11, the second middle frame 21 and the third middle frame 31 can be used for the entire foldable electronic device 100, and are also used to carry some corresponding functional components, such as a flexible display screen of the foldable electronic device 100, etc.

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

[0036] In some embodiments, Figure 1-Figure 3As shown, the radiation branch 7 and the first parasitic branch 8 are in the shape of long strips, the first ground end 71 and the first open end 72 are the opposite ends of the radiation branch 7 in the length direction, the second ground end 81 and the second open end 82 are the opposite ends of the first parasitic branch 8 in the length direction, and when the foldable electronic device 100 is in a folded state, the radiation branch 7 is roughly parallel to the first parasitic branch 8.

[0037] That is, in some embodiments, when the foldable electronic device 100 is in a folded state, the radiation branch 7 is roughly parallel to the first parasitic branch 8, so that the current I2 from the second open-circuit end 82 of the first parasitic branch 8 to the second ground end 81 will eventually be basically parallel and in the same direction as the current I1 from the first ground end 71 to the first open-circuit end 72 on the radiation branch 7, thereby enabling the current I2 generated in the first parasitic branch 8 to more effectively enhance the radiation energy of the radiation branch 7.

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

[0039] In some embodiments, the radiation branch node 7 and the first parasitic branch node 8 are in the shape of long strips, including long straight strips or long strips in a bent or curved state. When the radiation branch node 7 and the first parasitic branch node 8 are in the shape of long straight strips, the longest sides of the radiation branch node 7 and the first parasitic branch node 8 are the longest straight sides. When the radiation branch node 7 and the first parasitic branch node 8 are in the shape of long strips in a bent or curved state, the longest sides of the radiation branch node 7 and the first parasitic branch node 8 are the longest bent or curved sides.

[0040] In some embodiments, the length direction of the radiating 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 at which the first parasitic branch 8 is arranged. 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 at which the first parasitic branch 8 is arranged, thereby making the radiating branch 7 substantially parallel to the first parasitic branch 8.

[0041] That is, in some embodiments, the radiation branch 7 is arranged at the first end 1D of the first main body portion 1 and is substantially parallel to the length direction of the first end 1D, and the first parasitic branch 8 is arranged at the second end 2D of the second main body portion 2 or the third end 3D of the third main body portion 3 and is parallel to the length direction of the second end 2D or the third end 3D at which it is arranged. 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 main body part 1, the second end 2D of the second main body part 2 and the third end 3D of the third main body part 3 are all in a roughly parallel state, thus, by arranging the radiating branch 7 at the first end 1D of the first main body part 1 and being roughly parallel to the length direction of the first end 1D, and arranging the first parasitic branch 8 at the second end 2D of the second main body part 2 or the third end 3D of the third main body part 3 and being parallel to the length direction of the second end 2D or the third end 3D where the first parasitic branch 8 is arranged, when the foldable electronic device 100 is in a folded state, the radiating branch 7 will be roughly parallel to the first parasitic branch 8.

[0042] Obviously, in other embodiments, the length direction of the radiating 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 arranged. As long as the angle between the length direction of the radiating 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 arranged, the radiating branch 7 can be roughly parallel to the first parasitic branch 8 when the foldable electronic device 100 is in a folded state.

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

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

[0045] The first end 1D, the second end 2D, and the third end 3D have the same orientation and are perpendicular to the first rotation axis 4 and the second rotation axis 5, which may 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 perpendicular to the axes of the first rotation axis 4 and the second rotation axis 5. The aforementioned first rotation axis 4 and the second rotation axis 5 are parallel, which may mean that the axes of the first rotation axis 4 and the second rotation axis 5 are parallel.

[0046] In some embodiments, the radiating branch 7 and the first parasitic branch 8 are flat and long strips, the surface with the largest area of ​​the radiating branch 7 is parallel to the end face of the first end 1D of the first main body 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 main body 2 or the third end 3D of the third main body 3.

[0047] In some embodiments, the length direction of the radiation branch 7 is substantially parallel to the length direction of the first parasitic branch 8, which means that the angle between the two can be within a preset angle range, and does not need to be strictly parallel. For example, the angle between the length direction of the radiation branch 7 and the length direction of the first parasitic branch 8 can be within ±10°, etc. The length direction of the radiation 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 arranged, which can also mean that the angle between the length direction of the radiation branch 7 and the length direction of the first end 1D can be within a preset angle range, and 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 arranged can be within a preset angle range.

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

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

[0050] In some embodiments, Figure 1 and Figure 3As shown in the figure, the feeding point F1 is located between the first grounding end 71 and the first open-circuit end 72, forming an IFA (Inverted F antenna) antenna. The portion of the radiation branch 7 from the first grounding end 71 to the first open-circuit end 72 all participates in the radiation, so the electrical length of the radiation branch 7 is substantially equal to the length of the radiation branch 7.

[0051] In some embodiments, the electrical length of the first parasitic stub 8 is less than the electrical length of the radiation stub 7. In some embodiments, the electrical length of the first parasitic stub 8 is substantially equal to the length of the first parasitic stub 8, that is, the length of the first parasitic stub 8 from the second ground end 81 to the second open end 82.

[0052] In some embodiments, the first parasitic branch 8 mainly resonates at a higher-order mode in the preset frequency band, such as a secondary mode. Therefore, the electrical length of the first parasitic branch 8 is smaller than the electrical length of the radiation branch 7 .

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

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

[0055] See also Figure 5 , is another schematic diagram illustrating a part of the internal structure of the foldable electronic device 100 in some embodiments of the present application when the foldable electronic device 100 is in a folded state. In some embodiments, as Figure 5 As shown, the foldable electronic device 100 also 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 to perform 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 ground terminal 81 of the first parasitic branch 8 and the ground, and the first matching unit M1 can be equivalent to a portion of the electrical length, so the sum of the electrical length equivalent to the first matching unit M1 and the electrical length of the first parasitic branch 8 meets the requirement of resonating in the higher-order mode of the preset frequency band. That is, when the foldable electronic device 100 includes the first matching unit M1, the sum of the electrical length equivalent to the first matching unit M1 and the electrical length of the first parasitic branch 8 is approximately equal to the electrical length of the first parasitic branch 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 stub 8 also satisfies the condition that the sum is less than λ / 4 and greater than or equal to λ / 8.

[0058] Wherein, 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 as a whole. Since the electrical length equivalent to the inductor is a positive value, the length of the first parasitic branch 8 can be shortened, which is beneficial to reducing the overall size. In other embodiments, the first matching unit M1 may also include a capacitor or present a capacitive reactance as a whole. Since the electrical length equivalent to the capacitor is a negative value, the length of the first parasitic branch 8 can be longer, even exceeding the length of the radiation branch 7, and the overall structural strength can be increased as needed. Therefore, by adding the first matching unit M1, the first parasitic branch 8 can be flexibly designed.

[0059] See also Figure 6 , is another plan view of the foldable electronic device 100 in some embodiments of the present application in an unfolded state. Figure 6 As shown, the foldable electronic device 100 also includes a second parasitic branch 9, which is arranged at the other of the second end 2D of the second main body part 2 and the third end 3D of the third main body part 3; when the foldable electronic device 100 is in a folded state, the second parasitic branch 9 is close to and spaced from the radiation branch 7, and the feed source 6 excites the second parasitic branch 9 through coupling with the radiation 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 at 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 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. 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 radiation branch 7 disposed at the first end 1D of the first body portion 1 will be located between the first parasitic branch 8 disposed at one of the second body portion 2 and the third body portion 3 and the second parasitic branch 9 disposed at the other of the second body portion 2 and the third body portion 3, so that the feed source 6 can simultaneously couple and excite the first parasitic branch 8 and the second parasitic branch 9 through the radiation branch 7, thereby further improving the radiation performance of the preset frequency band.

[0061] in, Figure 6 In the embodiment, the first parasitic branch 8 is provided at the second end 2D of the second body portion 2, and the second parasitic branch 9 is provided at the third end 3D of the third body portion 3. Obviously, in some embodiments, the first parasitic branch 8 may also be provided at the third end 3D of the third body portion 3, and the second parasitic branch 9 may also be provided at the second end 2D of the second body portion 2.

[0062] Please also read Figure 7 , is another schematic diagram illustrating a part of the internal structure of the foldable electronic device in some embodiments of the present application in a folded state. As mentioned above, 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, and 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 of the second parasitic branch 9 to the third open-circuit terminal 92 is opposite to the direction from the first grounding terminal 71 of the radiation branch 7 to the first open-circuit terminal 72.

[0063] That is, in some embodiments, when the foldable electronic device 100 is in a folded state, the third ground end 91 of the second parasitic branch 9 and the first open end 72 of the radiation branch 7 are located on the same side, while the third open end 92 of the second parasitic branch 9 and the first ground end 71 of the radiation branch 7 are located on the other side.

[0064] The third open-circuit end 92 of the second parasitic branch 9 is in an open-circuit state, that is, 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 respectively the ends of the radiation branch 7, the first parasitic branch 8 and the second parasitic branch 9, and are all used for grounding, but the specific grounding position can be the three ends of the three grounding terminals, or it can be close to the corresponding ends but not necessarily at the ends.

[0066] As mentioned above Figure 6 As shown, when the foldable electronic device 100 is in the unfolded state, the direction from the second ground end 81 of the first parasitic branch 8 to the second open end 82 is substantially the same as the direction from the first ground end 71 of the radiation branch 7 to the first open end 72, and the direction from the third ground end 91 of the second parasitic branch 9 to the third open end 92 is substantially opposite to the direction from the first ground end 71 of the radiation branch 7 to the first open end 72. As mentioned above, when the foldable electronic device 100 is converted from the unfolded state to the folded state, the first body part 1 is first rotated around the first rotation axis 4 in the first direction to the upper part of the second body part 2 and is stacked with the second body part 2, and then the third body part 3 is rotated around the second rotation axis 5 in the second direction to the upper part of the first body part 1 and is 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. Thus, when the first main body part 1 rotates around the first rotation axis 4 along the first direction to the top of the second main body part 2 and is stacked with the second main body part 2, the direction from the second grounding end 81 of the first parasitic branch 8 to the second open end 82 can be roughly opposite to the direction from the first grounding end 71 of the radiation branch 7 to the first open end 72. Since the third main body part 3 rotates around the second rotation axis 5 along the second direction to the top of the first main body part 1, it is equivalent to maintaining a relative position relationship with the first main body part 1 in the unfolded state of the foldable electronic device 100. Therefore, the direction from the third grounding end 91 of the second parasitic branch 9 to the third open end 92 can be maintained roughly opposite to the direction from the first grounding end 71 of the radiation branch 7 to the first open end 72.

[0067] Please also read Figure 8 , is a schematic diagram of current distribution of the radiation branch 7, the first parasitic branch 8, and the second parasitic branch 9 when the foldable electronic device 100 in some embodiments of the present application is in a folded state. Figure 8As shown, the radiation branch 7 generates a current I1 from the first ground terminal 71 to the first open circuit terminal 72 under the stimulation of the feed source 6. When the foldable electronic device 100 is in a folded state, when the feed source 6 stimulates the first parasitic branch 8 through the radiation branch 7, a current I2 from the second open circuit terminal 82 of the first parasitic branch 8 to the second ground terminal 81 will be stimulated in the first parasitic branch 8, and a current I3 from the third open circuit terminal 92 of the second parasitic branch 9 to the third ground terminal 91 will also be stimulated in the second parasitic branch 9. Since the direction from the second ground end 81 of the first parasitic branch 8 to the second open end 82 is roughly opposite to the direction from the first ground end 71 to the first open end 72 of the radiation branch 7, the direction from the third ground end 91 of the second parasitic branch 9 to the third open end 92 is also opposite to the direction from the first ground end 71 to the first open end 72 of the radiation branch 7. Therefore, the current I2 from the second open end 82 of the first parasitic branch 8 to the second ground end 81 and the current I3 from the third open end 92 of the second parasitic branch 9 to the third ground end 91 will be the same as the direction of the current I1 from the first ground end 71 to the first open end 72 on the radiation branch 7. That is, the first parasitic branch 8 and the second parasitic branch 9 will both stimulate currents in the same direction as the current on the radiation branch 7. Since the currents are in the same direction, the radiation energy of the radiation branch 7 can be effectively enhanced. Compared with the case where only the first parasitic branch 8 is included, the radiation performance of the radiation branch 7 can be further improved.

[0068] Among them, Figure 7 and Figure 8 As shown, in some embodiments, the radiation branch 7 is arranged at the first end 1D of the first body part 1, and can be specifically arranged at the side of the first side B1 of the first middle frame 11 located at the first end 1D. The first parasitic branch 8 is arranged at one of the second end 2D of the second body part 2 and the third end 3D of the third body part 3, and can be specifically arranged at the side of the second side B2 of the second middle frame 21 located at the second end 2D or the side of the third side B3 of the third middle frame 31 located at the third end 3D, and the second parasitic branch 9 is arranged at the other of the second end 2D of the second body part 2 and the third end 3D of the third body part 3, and can be specifically arranged at the side of the third side B3 of the third middle frame 31 located at the third end 3D or the side of the second side B2 of the second middle frame 21 located at the second end 2D.

[0069] In some embodiments, the third grounding terminal 92 of the second parasitic branch 9 is 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 to be grounded.

[0070] In some embodiments, Figure 7 and Figure 8 As shown in the figure, the second parasitic branch 9 is also in the shape of a long strip, the third grounding end 91 and the third open end 92 are the opposite ends of the second parasitic branch 9 in the length direction, and when the foldable electronic device 100 is in a folded state, the second parasitic branch 9 is parallel to the radiation 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 roughly parallel to the radiation branch 7, so that the current I3 from the third open-circuit end 92 of the second parasitic branch 9 to the third ground end 91 will eventually be basically parallel and in the same direction as the current I1 from the first ground end 71 to the first open-circuit end 72 on the radiation branch 7, and the current I2 generated in the second parasitic branch 9 can also more effectively enhance the radiation energy of the radiation branch 7.

[0072] The second parasitic branch 9 being substantially parallel to the radiation branch 7 also means that the length direction of the second parasitic branch 9 is substantially parallel to the length direction of the radiation 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 radiation branch 7 is the extension direction of the longest side of the radiation branch 7 as mentioned above.

[0073] In some embodiments, the second parasitic branch 9 is in the shape of a long strip, including a long straight strip or a long strip in a bent or curved state. When the second parasitic branch 9 is in the shape of a long straight strip, the longest side of the second parasitic branch 9 is the longest straight side. When the second parasitic branch 9 is in the shape of a long strip in a bent or curved state, the longest side of the second parasitic branch 9 is the longest side in a bent or curved state.

[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 at which the first parasitic branch 8 is arranged, 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 at which the second parasitic branch 9 is arranged. 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, so that the radiating branch 7 is 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 radiating 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 arranged, 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 arranged. It is only necessary that the angle between the length direction of the radiating 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 second end 2D or the third end 3D where the first parasitic branch 8 is arranged, and the angle between the length direction of the second parasitic branch 9 and the length direction of the third end 3D or the second end 2D where the second parasitic branch 9 is arranged are the same. Then, when the foldable electronic device 100 is in a folded state, the radiating branch 7 can be roughly parallel to the first parasitic branch 8 and the second parasitic branch 9.

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

[0077] In some embodiments, the second parasitic branch 9 may also be a flat long strip, 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 main body 3 or the second end 2D of the second main body 2.

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

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

[0080] In some embodiments, similarly, the second parasitic branch 9 mainly resonates at a higher-order mode in the preset frequency band, such as a secondary mode, and therefore, the electrical length of the second parasitic branch 9 is smaller than the electrical length of the radiation branch 7 .

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

[0082] In some embodiments, the electrical length of the second parasitic branch node 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 node 9 is less than the electrical length of the radiation branch node 7, and may be less than λ / 4 and greater than or equal to λ / 8.

[0083] See also Fig. 9 , is another schematic diagram illustrating a part of the internal structure of the foldable electronic device 100 in some embodiments of the present application in a folded state. Fig. 9 As shown, the foldable electronic device 100 also 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 to perform 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 ground terminal 91 of the second parasitic branch 9 and the ground, and the second matching unit M2 can be equivalent to a portion of the electrical length, so the sum of the electrical length equivalent to the second matching unit M2 and the electrical length of the second parasitic branch 9 can meet the requirement of resonating in the higher-order mode of the preset frequency band. That is, when the foldable electronic device 100 includes the second matching unit M1, the sum of the electrical length equivalent to the second matching unit M1 and the electrical length of the second parasitic branch 9 is approximately equal to the electrical length of the second parasitic branch 9 when the foldable electronic device 100 does not include the second matching unit M2.

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

[0086] Wherein, 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 as a whole. Since the electrical length equivalent to the inductor is a positive value, the length of the second parasitic branch 9 can be shortened, which is beneficial to reducing the overall size. In other embodiments, the second matching unit M2 may also include a capacitor or present a capacitive reactance as a whole. Since the electrical length equivalent to the capacitor is a negative value, the length of the second parasitic branch 9 can be longer, even exceeding the length of the radiation branch 7, and the overall structural strength can be increased as needed. Therefore, by adding the second matching unit M2, the second parasitic branch 9 can be flexibly designed.

[0087] Among them, the aforementioned Figure 7 and Figure 8 In the embodiment, the foldable electronic device 100 does not include the first matching unit M1 and the second matching unit M2. Fig. 9 In the figure, it is illustrated that the foldable electronic device 100 can include the first matching unit M1 and the second matching unit M2 at the same time.

[0088] Obviously, in some embodiments, the foldable electronic device 100 may also only include a first matching unit M1 connected between the second ground terminal 81 of the first parasitic branch 8 and the ground, but not include a second matching unit M2 connected between the third ground terminal 91 of the second parasitic branch 9 and the ground; or, the foldable electronic device 100 may also only include a second matching unit M2 connected between the third ground terminal 91 of the second parasitic branch 9 and the ground, but not include a first matching unit M1 connected between the second ground terminal 81 of the first parasitic branch 8 and the ground.

[0089] Wherein, in some embodiments, Figure 2-Figure 3 As shown in the figure, the length of the first parasitic branch 8 may be smaller than the length of the radiation 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-circuit end 72 of the radiation 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 on the radiation branch 7 approximately coincides with the first open-circuit end 72 of the radiation branch 7.

[0090] In some embodiments, Figure 7-Figure 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 may also be less than the length of the radiation 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 and the third grounding end 91 of the second parasitic branch 9 are approximately flush with the first open-circuit end 72 of the radiation 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 on the radiation branch 7 is approximately coincident with the first open-circuit end 72 of the radiation branch 7, and the projection of the third grounding end 91 of the second parasitic branch 9 on the radiation branch 7 is also approximately coincident with the first open-circuit end 72 of the radiation branch 7.

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

[0092] See also Fig.10 , is another schematic diagram illustrating part of the internal structure of the foldable electronic device 100 in some embodiments of the present application in a folded state. 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 can be unlimited. For example, Fig.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 the radiation branch 7, and the length of the second parasitic branch 9 may be approximately equal to the radiation branch 7.

[0093] Wherein, in some embodiments, Fig.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 also be not flush with the first open-circuit end 72 of the radiation branch 7. In some embodiments, Fig.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, extend 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 first parasitic branch 8 and the second parasitic branch 9 can be designed flexibly.

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

[0096] See also Fig.11 , is a schematic diagram of return loss, system total efficiency and radiation efficiency curves of a reference foldable electronic device in an unfolded state and a folded state. The reference foldable electronic device is a foldable electronic device that does not include the first parasitic branch 8 and the second parasitic branch 9. Fig.11 The return loss, total system efficiency and radiation efficiency curve of the radiation branch 7 when operating in the preset frequency band are obtained by simulation tests when the reference foldable electronic device is in the unfolded state and the folded state respectively.

[0097] in, Fig.11 The figure 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 the 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 the folded state.

[0098] Generally speaking, the trough of the return loss curve is the peak of the system total efficiency curve St1 and the 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, the frequency range is approximately 700MHz (megahertz) to 800MHz, and the resonant frequency is approximately 750MHz.

[0099] like Fig.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, while 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] It can be seen that when the reference foldable electronic device does not include the first parasitic branch 8 and the second parasitic branch 9, the return loss of the reference foldable electronic device in the folded state increases by about 5dB relative to the return loss of the reference foldable electronic device in the unfolded state, and the loss increases significantly. The total system efficiency of the reference foldable electronic device in the folded state decreases by about 4dB relative to the total system efficiency of the reference foldable electronic device in the unfolded state. The radiation efficiency of the reference foldable electronic device in the folded state decreases by about 2dB relative to the radiation efficiency of the reference foldable electronic device in the unfolded state. Both the total system efficiency and the radiation efficiency decrease 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 radiation branch 7 is significantly reduced when the reference foldable electronic device is in a folded state compared to when the reference foldable electronic device is in an unfolded state.

[0102] See also Fig.12 , which is a schematic diagram comparing the return loss and system total efficiency curves of the foldable electronic device 100 in some embodiments of the present application and the reference foldable electronic device. The reference foldable electronic device as mentioned above is a foldable electronic device that does not include the first parasitic branch 8 and the second parasitic branch 9. Fig.12 The return loss and total system efficiency curve of the radiation branch 7 when working in the preset frequency band obtained by simulation tests when the reference foldable electronic device is in the unfolded state and the folded state, respectively, and the return loss and total system efficiency curve of the radiation branch 7 when working in the preset frequency band obtained by simulation tests when the foldable electronic device 100 in some embodiments of the present application is in the folded state. In some embodiments, the return loss and total system efficiency curve of the radiation branch 7 when working in the preset frequency band obtained by simulation tests when the foldable electronic device 100 in some embodiments of the present application is in the folded state specifically include the return loss and total system efficiency curve of the radiation branch 7 when working in the preset frequency band obtained by simulation tests when the foldable electronic device 100 only includes the first parasitic branch 8, and the return loss and total system efficiency curve of the radiation branch 7 when working in the preset frequency band obtained by simulation tests when the foldable electronic device 100 includes both the first parasitic branch 8 and the second parasitic branch 9, and the return loss and total system efficiency curve of the radiation branch 7 when working in the preset frequency band obtained by simulation tests when the foldable electronic device 100 is in the folded state.

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

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

[0105] It can be seen that when one parasitic branch is added, the return loss can be effectively reduced and the overall system efficiency can be improved. When two parasitic branches are added, the return loss can be more significantly reduced and the overall system efficiency can be improved. The radiation performance is almost the same as that of the foldable electronic device in the unfolded state, greatly improving the radiation performance.

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

[0107] See also Fig.13 , is a simplified schematic diagram showing a partial structure of a foldable electronic device 100 in some embodiments of the present application. Fig.13As shown, the foldable electronic device 100 includes the first parasitic branch 8 and the second parasitic branch 9 at the same time, and the foldable electronic device 100 also includes a first grounding switch SW1 and a second grounding switch SW2, the first grounding switch SW1 is connected between the second grounding end 81 of the first parasitic branch 8 and the ground, and is used to conduct or disconnect the connection between the second grounding end 81 of the first parasitic branch 8 and the ground, and the second grounding switch SW2 is connected between the third grounding end of the second parasitic branch 9 and the ground, and is used to conduct or disconnect the connection between the third grounding end 91 of the second parasitic branch 9 and the ground. Wherein, when the first grounding switch SW1 is turned on, the second grounding end 81 of the first parasitic branch 8 is connected to the 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, and when the second grounding switch SW2 is turned on, the third grounding end 91 of the second parasitic branch 9 is connected to the 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 disconnected, the connection between the second grounding terminal 81 of the first parasitic branch 8 and the ground is disconnected, and both ends of the first parasitic branch 8 are open-circuited ends, which is equivalent to not existing, that is, at this time, the first parasitic branch 8 is in a disabled state and will not resonate at the high-order mode of the preset frequency band under the coupling excitation of the feed source 6, and will not affect the radiation performance of the radiation branch 7. Similarly, when the second grounding switch SW2 is disconnected, the connection between the third grounding terminal 91 of the second parasitic branch 9 and the ground is disconnected, and both ends of the second parasitic branch 9 are open-circuited ends, which is equivalent to not existing, that is, at this time, the second parasitic branch 9 is in a disabled state and will not resonate at the high-order mode of the preset frequency band under the coupling excitation of the feed source 6, and will not affect the radiation performance of the radiation branch 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, Fig.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 be specifically connected between the second grounding terminal 81 of the first parasitic branch 8 and the first matching unit M1, or between the first matching unit M1 and the ground; the second grounding switch SW2 may be specifically connected between the third grounding terminal 91 of the second parasitic branch 9 and the second matching unit M2, or between the second matching unit M2 and the ground. Fig.13 For illustration, an example is given in which the first grounding switch SW1 is connected between the first matching unit M1 and the ground, and the second grounding switch SW2 is connected between the second matching unit M2 and the ground.

[0111] Please also read Fig.14 , is a structural block diagram showing a partial structure of a foldable electronic device 100 in some embodiments of the present application. Fig.13 as well as Fig.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, and is used to control the first grounding switch SW1 to be turned on and the second grounding switch SW2 to be turned off when a first preset condition is currently met, and to control the second grounding switch SW2 to be turned on and the first grounding switch SW1 to be turned off when a second preset condition is currently met, and to control the first grounding switch SW1 and the second grounding switch SW2 to be turned on at the same time when a third preset condition is currently met.

[0112] That is, the controller 10 may 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 currently satisfied.

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

[0114] That is, in some embodiments, the controller 10 may control the first grounding switch SW1 to be turned on and the second grounding switch SW2 to be turned off when the human body is detected approaching the second parasitic branch 9, and control the second grounding switch SW2 to be turned on and the first grounding switch SW1 to be turned off when the human body is detected approaching the first parasitic branch 8, and control the first grounding switch SW1 and the second grounding switch SW2 to be turned on at the same time when the human body is detected approaching the first parasitic branch 8 and the second parasitic branch 9.

[0115] Among them, since when the human body is close to the second parasitic branch 9, the second parasitic branch 9 will be affected by the human body, resulting in a decrease in the actual help to the radiation efficiency. Therefore, at this time, the first grounding switch SW1 can be controlled to be turned on and the second grounding switch SW2 can be controlled to be turned off, so that the first parasitic branch 8 is enabled and the second parasitic branch 9 is disabled, so that the coupling energy can be more concentrated on the side of the first parasitic branch 8 that is not blocked by the human body, and the radiation performance can be improved while avoiding the influence of the human body. Similarly, when the human body is close to the first parasitic branch 8, the first parasitic branch 8 will be affected by the human body, resulting in a decrease in the actual help to the radiation efficiency. Therefore, at this time, the second grounding switch SW2 can be controlled to be turned on and the first grounding switch SW1 can be controlled to be turned off, so that the second parasitic branch 9 is enabled and the first parasitic branch 8 is disabled, so that the coupling energy can be more concentrated on the side of the second parasitic branch 9 that is not blocked by the human body, and the radiation performance can be improved while avoiding the influence of the human body. When a human body approaches the first parasitic branch 8 and the second parasitic branch 9 at the same time, the first parasitic branch 8 and the second parasitic branch 9 will be affected by the human body. At this time, the first grounding switch SW1 and the second grounding switch SW2 are controlled to be turned on at the same time, so as to maximize the radiation performance of the radiation branch 7.

[0116] In some embodiments, the foldable electronic device 100 may make the first ground switch SW1 and the second ground switch SW2 both turned on by default, so that, according to the different situations of detecting the approach of the human body, one of the first ground switch SW1 and the second ground switch SW2 may be controlled to be disconnected, or the first ground switch SW1 and the second ground switch SW2 may be controlled to remain turned on.

[0117] In some embodiments, Fig.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 arranged corresponding to the first parasitic branch 8, and is used to generate a sensing signal when sensing the approach of a human body. The second sensing element 30 is arranged corresponding to the second parasitic branch 9, and is used to generate a sensing signal when sensing the approach of a human body. 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 the human body is detected to be close to the first parasitic branch 8. When the controller 10 receives the sensing signal generated by the second sensing element 30, it determines that the human body is detected to be close to 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 detects and determines whether the human body is close to the first parasitic branch 8 and detects and determines whether the human body is close to the second parasitic branch 9 through the first sensing element 20 and the second sensing element 30 respectively.

[0119] In some embodiments, the first sensing element 20 and the second sensing element 30 are both metal conductors. Since the human body is also a conductor, when the human body is close to 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 the charge of the first sensing element 20 or the second sensing element 30 to change, thereby generating the sensing signal, which may 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 the first parasitic branch 8 and the second parasitic branch 9 are both metal 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 volume.

[0121] The aforementioned radiation branches 7 are also metal conductors.

[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 also 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 a mechanical button, a fingerprint module, a receiver, a speaker module, a metal structure in a wireless charging structure, a metal decorative ring of a camera, a metal plate on a circuit board bracket, a metal card tray, and nanocrystals or ceramic ferrites of an NFC module. 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 also 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 the sensing signal generated by the first sensing element 30 is received, and when the data receiving pin connected to the second sensing element 30 receives a sensing signal, the controller 10 determines that the sensing signal generated by the second sensing element 30 is received.

[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 the preset correspondence between the receiving pin and the sensing element, and further determine the target parasitic branch corresponding to the target sensing element according to the preset correspondence between the sensing element and the parasitic branch, so that the parasitic branch currently approached by the human body can be determined as the target parasitic branch, and the aforementioned operations can be controlled to be executed, 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 correspondence, namely, the correspondence between the preset receiving pins and the sensing elements and the correspondence between the preset sensing elements and the parasitic branches.

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

[0127] That is, in some other embodiments, the controller 10 may control the first grounding switch SW1 and the second grounding switch SW2 to be disconnected accordingly according to whether the radiation performance on the first parasitic branch 8 side and the second parasitic branch 9 side of the radiation branch 7 is reduced to improve the radiation performance.

[0128] In some other embodiments, the foldable electronic device 100 may, by default, make both the first grounding switch SW1 and the second grounding switch SW2 disconnected or only control one of them to be turned on, so that, according to different conditions of the above-mentioned radiation performance, one of the first grounding switch SW1 and the second grounding switch SW2 may be controlled to be turned on or maintained on, or both the first grounding switch SW1 and the second grounding switch SW2 may be controlled to be turned on.

[0129] The first grounding switch SW1 and the second grounding switch SW2 may be digitally controlled switches, for example, MOS transistors, BJT transistors, etc. The controller 10 may control the first grounding switch SW1 and the second grounding switch SW2 to be turned on or off accordingly by outputting corresponding level signals to the first grounding switch SW1 and the second grounding switch SW2.

[0130] Please return to Figure 1 etc., wherein Figure 1 As shown, the foldable electronic device 100 further includes a frame 200, and the frame 200 is arranged around the foldable electronic device 100. The radiation branch 7 is arranged at the frame 200 located at the first end 1D of the first body part 1, the first parasitic branch 8 is arranged at the frame 200 located at one of the second end 2D of the second body part 2 and the third end 3D of the third body part 3, and the third parasitic branch 9 is arranged at the frame 200 located at the other of the second end 2D of the second body part 2 and the third end 3D of the third body part 3.

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

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

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

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

[0135] That is, the radiation branch node 7, the first parasitic branch node 8 and the second parasitic branch node 9 are metal segments arranged in the frame of the foldable electronic device 100. For example, the radiation branch node 7 is a metal segment arranged in the first sub-frame 201, the first parasitic branch node 8 is a metal segment arranged in the second sub-frame 202, and the second parasitic branch node 9 is a metal segment arranged 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-metal frame with low conductivity such as plastic, ceramic, etc. The radiation branch 7, the first parasitic branch 8 and the second parasitic branch 9 are metal segments arranged in the frame 200 of the foldable electronic device 100.

[0137] Among them, 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 radiation 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 arranged on the inner side of the frame 200 of the foldable electronic device 100.

[0138] In some embodiments, the foldable electronic device 100 also includes an antenna bracket, which is made of insulating material. The radiation branch 7, the first parasitic branch 8 and the second parasitic branch 9 can be fixed on the corresponding antenna bracket and fixed to a position of the electronic device near the frame 200 through the antenna bracket.

[0139] For example, the radiation branch 7, the first parasitic branch 8 and the second parasitic branch 9 can be an FPC (flexible printed circuit) fixedly arranged on the antenna bracket or an LDS (Laser-Direct-structuring) metal segment formed on the antenna bracket by laser technology, or a PDS metal segment formed on the antenna bracket by PDS (Printing Direct Structure) technology (for example, a metal segment is formed by printing conductive ink, conductive silver paste, etc. on the antenna bracket), and fixed in the electronic device 100 through the antenna bracket.

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

[0141] In some embodiments, the antenna bracket may be made of LCP (Liquid Crystal Polymer). In other embodiments, the antenna bracket may be made of other insulating materials, such as plastic, resin, rubber and the like.

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

[0143] Among them, the directional terms such as "top" and "bottom" used in the embodiments of the present application to describe the foldable electronic device 100 are mainly explained based on the orientation when the user holds the foldable electronic device 100 in hand, with the position facing the top side of the foldable electronic device 100 as the "top" and the position facing the bottom side of the foldable electronic device 100 as the "bottom". It does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood 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 where the headphone jack and the USB port are provided, and the top end of the foldable electronic device 100 is the other end opposite to the end where the headphone jack and the USB port are provided, and may also refer to the end where a camera, a receiver, etc. are provided.

[0144] The foldable electronic device 100 of the present application may be any foldable electronic device with an antenna, such as a foldable mobile phone, a foldable computer, etc.

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

[0146] In the present application, when the foldable electronic device 100 is in a folded state, the radiation branch node 7 is set at the first end 1D of the first main body portion 1 between the second main body portion 2 and the third main body portion 3, and the first parasitic branch node 8 is set at the second end 2D of the second main body portion 2 and one of the third end 3D of the third main body portion 3. When the foldable electronic device 100 is in a folded state, the feed source 6 can couple and excite the first parasitic branch node 8 through the radiation branch node 7 to perform coupled resonance, thereby improving the radiation performance of the preset frequency band.

[0147] Among them, each embodiment of the present application has its own focus. For elements that are not described in detail in a certain embodiment, please refer to the corresponding description of other embodiments.

[0148] The above description is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application; in the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A foldable electronic device, characterized in that: include: The first body part; A second body portion; The third body part; A first rotating shaft 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 rotating shaft; A second rotating shaft 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 rotating shaft, wherein the first rotating shaft is parallel to the second rotating shaft; Feeds; A radiation branch node is arranged at the first end of the first main body portion, the radiation branch node comprises a feeding point, the feeding point is connected to the feed source, and the radiation branch node operates in a preset frequency band under the excitation of the feed source; A first parasitic branch 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 are oriented in the same direction and are perpendicular to the first rotation axis and the second rotation axis; Wherein, when the foldable electronic device is in a folded state, the first main body portion is located between the second main body portion and the third main body portion, and the first parasitic branch is close to and spaced from the radiation branch, and the feed source excites the first parasitic branch through coupling with the radiation branch to improve the radiation performance of the preset frequency band.

2. The foldable electronic device according to claim 1, characterized in that: The radiating branch includes a first grounding end and a first open end, the first grounding end is used for grounding, and the first parasitic branch includes a second grounding end and a second open end, the second grounding end is used for grounding; when the foldable electronic device is in a folded state, the direction from the second grounding end of the first parasitic branch to the second open end is opposite to the direction from the first grounding end of the radiating branch to the first open end.

3. The foldable electronic device according to claim 2, characterized in that: The radiation branch and the first parasitic branch are in the shape of long strips, the first ground end and the first open end are the opposite ends of the radiation branch in the length direction, the second ground end and the second open end are the opposite ends of the first parasitic branch in the length direction, and when the foldable electronic device is in a folded state, the radiation branch is parallel to the first parasitic branch.

4. The foldable electronic device according to claim 3, characterized in that: The electrical length of the radiation branch is λ / 4, where λ is the wavelength corresponding to the preset frequency band.

5. The foldable electronic device according to claim 4, characterized in that: The electrical length of the first parasitic stub is less than λ / 4 and greater than or equal to λ / 8.

6. The foldable electronic device according to claim 4, characterized in that: The foldable electronic device also includes a first matching unit, which is connected between the second ground terminal of the first parasitic branch and the ground. The first matching unit is used to perform matching adjustment, and the sum of the equivalent electrical length of the first matching unit and the electrical length of the first parasitic branch is less than λ / 4 and greater than or equal to λ / 8.

7. The foldable electronic device according to any one of claims 1 to 6, characterized in that: The foldable electronic device also includes a second parasitic branch, which is arranged at the other of the second end of the second main body and the third end of the third main body; when the foldable electronic device is in a folded state, the second parasitic branch is close to and spaced from the radiation branch, and the feed source further excites the second parasitic branch through coupling with the radiation branch to improve the radiation performance of the preset frequency band.

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

9. The foldable electronic device according to claim 8, characterized in that: The second parasitic branch is in the shape of a long strip, the third ground end and the third open end are two opposite ends of the second parasitic branch in the length direction, and when the foldable electronic device is in a folded state, the second parasitic branch is parallel to the radiation branch.

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

11. The foldable electronic device according to claim 9, characterized in that: The foldable electronic device also includes a second matching unit, which is connected between the third ground terminal of the second parasitic branch and the ground. The second matching unit is used to perform matching adjustment, and the sum of the equivalent electrical length of the second matching unit and the electrical length of the second parasitic branch is less than λ / 4 and greater than or equal to λ / 8.

12. The foldable electronic device according to claim 7, characterized in that: The foldable electronic device also includes a first grounding switch and a second grounding switch, wherein the first grounding switch is connected between the second grounding end of the first parasitic branch and the ground, and is used to conduct or disconnect the connection between the second grounding end of the first parasitic branch and the ground, and the second grounding switch is connected between the third grounding end of the second parasitic branch and the ground, and is used to conduct or disconnect the connection between the third grounding end of the second parasitic branch and the ground; wherein, when the first grounding switch is turned on, the second grounding end of the first parasitic branch is connected to the ground, and 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 grounding switch is turned on, the third grounding end of the second parasitic branch is connected to the ground, and 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 according to claim 12, characterized in that: The foldable electronic device also includes a controller, which is connected to the first grounding switch and the second grounding switch, and is used to control the first grounding switch to be turned on and the second grounding switch to be turned off when a first preset condition is currently met, and to control the second grounding switch to be turned on and the first grounding switch to be turned off when a second preset condition is currently met, and to control the first grounding switch and the second grounding switch to be turned on at the same time when a third preset condition is currently met.

14. The foldable electronic device according to claim 13, characterized in that: The first preset condition includes detecting that a human body is close to the second parasitic branch, the second preset condition includes detecting that a human body is close to the first parasitic branch, and the third preset condition includes detecting that a human body is close to the first parasitic branch and the second parasitic branch.

15. The foldable electronic device according to claim 14, characterized in that: The foldable electronic device includes a first sensing element and a second sensing element. The first sensing element is arranged corresponding to the first parasitic branch and is used to generate a sensing signal when sensing a human body approaches. The second sensing element is arranged corresponding to the second parasitic branch and is used to generate a sensing signal when sensing a human body approaches. The controller is connected to the first sensing element and the second sensing element. When the controller receives the sensing signal generated by the first sensing element, it determines that the human body is detected to be close to the first parasitic branch. When the controller receives the sensing signal generated by the second sensing element, it determines that the human body is detected to be close to the second parasitic branch.

16. The foldable electronic device according to claim 15, characterized in that: The first sensing element reuses the first parasitic branch, and the second sensing element reuses the second parasitic branch.

17. The foldable electronic device according to claim 1, characterized in that: The preset frequency band is a low frequency band.

18. The foldable electronic device according to claim 7, characterized in that: The foldable electronic device includes a frame, the radiation branch is arranged at the frame located at the first end of the first main body, the first parasitic branch is arranged at the frame located at one of the second end of the second main body and the third end of the third main body, and the third parasitic branch is arranged at the frame located at the other of the second end of the second main body and the third end of the third main body.

19. The foldable electronic device according to claim 18, characterized in that: The frame of the foldable electronic device is a metal frame, the radiation branch is formed by a metal frame located at the first end of the first main body, the first parasitic branch is formed by a metal frame located at one of the second end of the second main body and the third end of the third main body, and the third parasitic branch is formed by a metal frame located at the other of the second end of the second main body and the third end of the third main body.

20. The foldable electronic device according to claim 18, characterized in that: The frame of the foldable electronic device is a non-metal frame, the radiating branch is a metal segment arranged in the frame of the first end of the first main body, the first parasitic branch is a metal segment arranged in the frame of one of the second end of the second main body and the third end of the third main body, and the second parasitic branch is a metal segment arranged in the frame of the other of the second end of the second main body and the third end of the third main body.

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