Foldable electronic device

Abstract

The invention provides foldable electronic equipment. The foldable electronic equipment comprises a first body part, a second body part, a feed source and a radiation branch knot, wherein the first body part and the second body part are rotationally connected through a rotating piece. The radiation branch knot is arranged on the first body part and comprises a feeding point connected with the feed source, and the radiation branch knot works in a first resonance mode and a second resonance mode under excitation of the feed source. The parasitic branch is arranged on the second body part. And when the foldable electronic equipment is in a folded state, the projections of the radiation branch knot and the parasitic branch knot in the stacking direction of the first body part and the second body part at least partially coincide, and the feed source couples and excites the parasitic branch knot to work in a third resonant mode through the radiation branch knot, and the first resonant mode, the second resonant mode and the third resonant mode are respectively used for supporting receiving and transmitting of electromagnetic wave signals of three adjacent frequency bands. According to the foldable electronic equipment, the overall antenna performance 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 size increases, the size of the whole machine becomes 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 a large screen display. Therefore, foldable foldable electronic devices are gradually emerging. The current foldable electronic device includes two frame parts and a rotating member connecting the two frame parts, and the two frame parts can be rotated around the rotating member to achieve folding or unfolding. In addition, 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. How to ensure the antenna performance of foldable electronic devices has become a problem that needs to be solved. Summary of the invention

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

[0004] In the first aspect, a foldable electronic device is provided, comprising a first body part, a second body part, a rotating member, a feed source, and a radiation branch. The rotating member is connected between the first body part and the second body part, wherein the first body part and the second body part are rotationally connected through the rotating member. The radiation branch is arranged on the first body part, the radiation branch includes a feeding point, the feeding point is connected to the feed source, and the radiation branch works in a first resonance mode and a second resonance mode under the excitation of the feed source. The parasitic branch is arranged on the second body part. When the foldable electronic device is in a folded state, the first body part and the second body part are stacked, the projections of the radiation branch and the parasitic branch in the stacking direction of the first body part and the second body part at least partially overlap, and the feed source excites the parasitic branch to work in a third resonance mode through the radiation branch coupling, wherein the first resonance mode, the second resonance mode, and the third resonance mode are respectively used to support the transmission and reception of electromagnetic wave signals in three frequency bands, wherein the three frequency bands are adjacent frequency bands.

[0005] The foldable electronic device of the present application, when the foldable electronic device is in a folded state, can operate in three resonant modes through the radiation branches and parasitic branches, and support the reception and transmission of electromagnetic wave signals in three adjacent frequency bands. The three adjacent frequency bands can enhance the radiation efficiency of each other, thereby enhancing the overall antenna performance. 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 3 This is a schematic diagram of the internal structure of a foldable electronic device in some embodiments of the present application when it is in an unfolded state.

[0010] Figure 4 This is another schematic diagram of the internal structure of the foldable electronic device in some embodiments of the present application when it is in an unfolded state.

[0011] Figure 5 Schematic diagram of a simple structure of a second matching unit in some embodiments of the present application.

[0012] Figure 6 FIG. 4 is another simple structural diagram of the second matching unit in some embodiments of the present application.

[0013] Figure 7 This is a schematic diagram of the return loss parameters of the radiation branches when the foldable electronic device in some embodiments of the present application is in the unfolded state.

[0014] Figure 8 This is a schematic diagram of return loss parameters after the radiation branch is coupled with the parasitic branch when the foldable electronic device in some embodiments of the present application is in a folded state.

[0015] Fig. 9 A reference schematic diagram of the radiation efficiency and the total system efficiency of a foldable electronic device in some embodiments of the present application when in an unfolded state and a folded state.

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

[0017] Fig.11 A reference schematic diagram of the radiation efficiency of the foldable electronic device in some embodiments of the present application when it includes the fifth matching unit and when it does not include the fifth matching unit in a folded state.

[0018] Fig.12Another plan view schematically illustrating 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.

[0019] Fig.13 The foldable electronic device in some embodiments of the present application adopts Fig.12 Structure and adoption Figure 1 The radiation efficiency of the parasitic branches and the total system efficiency of the structure in the folded state are shown in the schematic diagram.

[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 rotating member 3, a feed source 4, a radiation branch 5, and a parasitic branch 6. The rotating member 3 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 rotating member 3. The radiation branch 5 is arranged on the first body part 1, and the radiation branch 5 includes a feeding point F1, and the feeding point F1 is connected to the feed source 4. The radiation branch 5 works in the first resonance mode and the second resonance mode under the excitation of the feed source 4. The parasitic branch 6 is arranged on the second main body part 2, wherein when the foldable electronic device 100 is in a folded state, the first main body part 1 and the second main body part 2 are stacked, and the projections of the radiating branch 5 and the parasitic branch 6 in the stacking direction of the first main body part 1 and the second main body part 2 at least partially overlap, and the feed source 4 couples the radiating branch 5 to excite the parasitic branch 6 to operate in a third resonant mode, wherein the first resonant mode, the second resonant mode and the third resonant mode are respectively used to support the reception and transmission of electromagnetic wave signals in three frequency bands, wherein the three frequency bands are adjacent frequency bands.

[0024] Therefore, in the present application, when the foldable electronic device 100 is in a folded state, the radiation branch 5 and the parasitic branch 6 can operate in three resonant modes, and support the reception and transmission of electromagnetic wave signals in three adjacent frequency bands. The three adjacent frequency bands can enhance the radiation efficiency of each other, thereby improving the overall antenna performance.

[0025] In this application, the foldable electronic device 100 is in a folded state, which means that the angle between the first body part 1 and the second body part 2 of the foldable electronic device 100 is approximately 0°, that is, the surfaces of the first body part 1 and the second body part 2 are facing each other and approximately 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 and the second body part 2 of the foldable electronic device 100 is 180°, that is, the surfaces of the first body part 1 and the second body part 2 that are in contact with each other in the folded state are parallel to each other and face the same side.

[0026] In some embodiments, the three frequency bands are adjacent frequency bands, which may mean that the three frequency bands are adjacent in sequence, and the center frequencies of the three frequency bands, that is, the resonant frequencies, are close. For example, the difference between the center frequencies corresponding to any two frequency bands is within a preset value, or the difference between the center frequencies of two adjacent frequency bands is within a preset value, such as 200 MHz (megahertz) or 300 MHz.

[0027] Among them, the three adjacent frequency bands being adjacent frequency bands may also mean that the three frequency bands are adjacent in sequence, and the frequency ranges of at least two adjacent frequency bands partially overlap, or the interval between the frequency ranges of any two adjacent frequency bands is less than a preset frequency range value, for example, less than 100 MHz.

[0028] The rotating member 3 may be any rotatable structure such as a rotating shaft or a hinge, so that the first body portion 1 and the second body portion 2 are rotatably connected via the rotating member 3 .

[0029] Among them, Figure 1 As shown, the radiating branch node 5 also includes a first free end 51, a second free end 52 and a first grounding point G1. The feeding point F1 is closer to the first free end 51 than the first grounding point G1, that is, the feeding point F1 is located between the first grounding point G1 and the first free end 51. The foldable electronic device 100 also includes a first matching unit M1. The first grounding point G1 is grounded through the first matching unit M1. The part from the first grounding point G1 to the first free end 51 of the radiating branch node 5 is the main mode branch node 501 of the radiating branch node 5. The main mode branch node 501 operates in the first resonance mode under the excitation of the feed source 4, and the entire radiating branch node 5 operates in the second resonance mode under the excitation of the feed source 4.

[0030] That is, in some embodiments, the radiating branch 5 operates in the first resonance mode and the second resonance mode under the excitation of the feed source 4, which is specifically achieved by the main mode branch 501 between the first grounding point G1 and the first free end 51 of the radiating branch 5 operating in the first resonance mode under the excitation of the feed source 4, and the entire radiating branch 5 operating in the second resonance mode under the excitation of the feed source 4.

[0031] In some embodiments, the parasitic branch 6 includes a first grounding terminal 61 and a third free end 62, the first grounding terminal 61 is used for grounding, and when the foldable electronic device 100 is in a folded state, the entire parasitic branch 6 operates in a third resonant mode under the coupling excitation of the feed source 4, and the direction of the current from the third free end 62 to the first grounding terminal 61 generated by the parasitic branch 6 under the coupling excitation of the feed source 4 is at least partially the same as the direction of the current from the first grounding point G1 to the first free end 51 generated by the main mode branch 501 under the excitation of the feed source 4.

[0032] That is, in some embodiments, the projections of the radiation branch 5 and the parasitic branch 6 in the stacking direction of the first body portion 1 and the second body portion 2 at least partially overlap, and the radiation branch 5 and the parasitic branch 6 are adjacent, so that the parasitic branch 6 operates in the third resonant mode under the coupling excitation of the feed source 4, and the direction of the current generated by the parasitic branch 6 under the coupling excitation of the feed source 4 is at least partially the same as the direction of the current generated by the main mode branch 501 under the excitation of the feed source 4. The direction of the current generated by the parasitic branch 6 under the coupling excitation of the feed source 4 is specifically the direction from the third free end 62 to the first ground end 61, and the direction of the current generated by the main mode branch 501 under the excitation of the feed source 4 can specifically be the direction from the first ground point G1 to the first free end 51.

[0033] Therefore, structurally speaking, Figure 1 and Figure 2 As shown in the figure, in some embodiments, when the foldable electronic device 100 is in a folded state, the first grounding end 61 of the parasitic branch 6 and the first free end 51 of the radiating branch 5 are approximately located on the same side, and the third free end 62 of the parasitic branch 6 and the first grounding point G1 of the radiating branch 5 are also approximately located on the same side. That is, it can also be that the direction from the third free end 62 of the parasitic branch 6 to the first grounding end 61 is at least partially the same as the direction from the first grounding point G1 of the radiating branch 5 to the first free end 51. Therefore, when the current from the third free end 62 to the first grounding end 61 generated by the parasitic branch 6 under the coupling excitation of the feed source 4 is generated by the main mode branch 501 under the excitation of the feed source 4, the directions of the currents of the two are at least partially the same.

[0034] In some embodiments, Figure 1-Figure 2 As shown, the first body portion 1 includes two opposite first ends 11D and two opposite second ends 12D parallel to the rotating member 3, and the second body portion 2 includes two opposite third ends 21D and two opposite fourth ends 22D parallel to the rotating member 3. In some embodiments, part of the radiating branch 5 is located at the second end 12D of the first body portion 1 away from the rotating member 3, and part is located at a first end 11D of the first body portion 1, and part of the parasitic branch 6 is located at the fourth end 22D of the second body portion 2 away from the rotating member 3, and part is located at a third end 21D of the second body portion 2, wherein the first end 11D where the part of the radiating branch 5 is located and the third end 21D where the part of the parasitic branch 6 is located have the same orientation, and are both perpendicular to the rotating member 3. That is, as Figure 1-Figure 2As shown, the position of the radiating branch 5 at the first body 1 is approximately the same as the position of the parasitic branch 6 at the second body 2. Therefore, when the foldable electronic device 100 is in a folded state, the projections of the main mold branch 501 of the radiating branch 5 and the parasitic branch 6 in the stacking direction of the first body part 1 and the second body part 2 mostly overlap.

[0035] Among them, Figure 1-Figure 2 As shown, the first grounding point G1 of the radiation branch 5 is located at the second end 12D of the first body portion 1 away from the rotating member 3, the first free end 51 of the radiation branch 5 is located at the first end 11D where the radiation branch 5 is located, the first grounding end 61 of the parasitic branch 6 is located at the third end 21D where the parasitic branch 6 is located, and the third free end 62 of the parasitic branch 6 is located at the fourth end 22D of the second body portion 2 away from the rotating member 3. That is, in some embodiments, as Figure 1-Figure 2 As shown, the direction from the third free end 62 of the parasitic branch 6 to the first grounding end 61 is substantially the same as the direction from the first grounding point G1 of the radiation branch 5 to the first free end 51 .

[0036] Please also read Figure 3 , is a schematic diagram of the internal structure of the foldable electronic device 100 in some embodiments of the present application when it is in an unfolded state. Among them, Figure 3 The partial internal structure schematic diagram shown is a partial internal structure schematic diagram showing the internal structure after the shells of the first main body part 1 and the second main body part 2 are removed.

[0037] in, Figure 3 Schematically shows the current I1 generated by the radiation branch 5 under the excitation of the feed source 4 and the current I2 generated by the parasitic branch 6 under the coupled excitation of the feed source 4 . Figure 3 The currents I1 and I2 are illustrated in the unfolded state only for the sake of convenience. In actual situations, the current I2 generated by the parasitic branch 6 under the coupling excitation of the feed source 4 is generated when the foldable electronic device 100 is in the folded state.

[0038] like Figure 3As shown, the main mode branch 501 of the radiation branch 5 generates a current I1 from the first grounding point G1 to the first free end 51 under the excitation of the feed source 4. At this time, the main mode branch 501 located between the first grounding point G1 and the first free end 51 works in the first resonant mode. When the foldable electronic device 100 is in a folded state, when the feed source 4 couples and excites the parasitic branch 6 through the radiation branch 5, a current I2 from the third free end 62 of the parasitic branch 6 to the first grounding end 61 will be excited in the parasitic branch 6. Since the direction from the third free end 62 of the parasitic branch 6 to the first grounding end 61 is substantially the same as the direction from the first grounding point G1 of the radiation branch 5 to the first free end 51, the current I2 from the third free end 62 of the parasitic branch 6 to the first grounding end 61 will be the same as the direction of the current I1 from the first grounding point G1 to the first free end 51 on the radiation branch 5. That is, the parasitic branch 6 excites a current in the same direction as the current of the main mode branch 501 of the radiation branch 5. Since the current directions are the same, and as mentioned above, the two frequency bands supported by the first resonance mode and the third resonance mode are adjacent frequency bands, the radiation energy of the first resonance mode of the main mode branch 501 can be effectively enhanced, thereby effectively improving the radiation performance of the first resonance mode of the main mode branch 501.

[0039] Among them, Figure 3 As shown, the radiation branch 5 will also generate a current I3 from the second free end 52 to the first free end 51 under the excitation of the feed source 4. At this time, the radiation branch 5 is excited to work in the second resonant mode as a whole. Therefore, the current directions of the current I2 excited on the parasitic branch 6, the current I1 excited by the main mode branch 501, and the current I3 excited by the radiation branch as a whole are the same. As mentioned above, the three frequency bands supported by the first resonant mode, the second resonant mode, and the third resonant mode are adjacent frequency bands. Therefore, the radiation energy of the second resonant mode of the radiation branch 5 can be effectively enhanced through the parasitic branch 6, and the second resonant mode of the radiation branch 5 and the first resonant mode of the main mode branch 501 can also be mutually enhanced. Therefore, the overall antenna performance can be effectively improved.

[0040] Among them, Figure 3As shown, in some embodiments, the foldable electronic device 100 further includes a first middle frame 11 and a second middle frame 21, wherein the first middle frame 11 may be located in the first body portion 1, and the second middle frame 21 may be located in the second body portion 2. When the radiation branch 5 is disposed in the first body portion 1, it may be disposed adjacent to the corresponding side of the first middle frame 11, and when the parasitic branch 6 is disposed in the second body portion 2, it may be disposed adjacent to the corresponding side of the second middle frame 21.

[0041] In some embodiments, the first middle frame 11 and the second middle frame 21 can be used as the whole ground of the foldable electronic device 100, and are also used to carry some corresponding functional devices, such as a flexible display screen of the foldable electronic device 100. Among them, the first grounding point G1 of the aforementioned radiation branch 5 can be electrically connected to the first middle frame 11 and grounded, and the first grounding end 61 of the aforementioned parasitic branch 6 can be electrically connected to the second middle frame 21 and grounded.

[0042] Please return to Figure 2 As mentioned above, when the foldable electronic device 100 is in a folded state, the first main body portion 1 and the second main body portion 2 are stacked. In some embodiments, the projections of the radiation branch 5 and the parasitic branch 6 in the stacking direction of the first main body portion 1 and the second main body portion 2 at least partially overlap.

[0043] Therefore, when the projections of the radiation branch 5 and the parasitic branch 6 in the stacking direction of the first main body portion 1 and the second main body portion 2 at least partially overlap, the feed source 4 can couple and excite the parasitic branch 6 through the radiation branch 5 to operate in the third resonance mode.

[0044] In some embodiments, the projections of the radiation branch node 5 and the parasitic branch node 6 in the stacking direction of the first body portion 1 and the second body portion 2 at least partially overlap, which may specifically include: the projections of the main mold branch node 501 of the radiation branch node 5 and the parasitic branch node 6 in the stacking direction of the first body portion 1 and the second body portion 2 at least partially overlap. As mentioned above, the feeding point F1 is located between the first grounding point G1 and the first free end 51, that is, the feeding point F1 is specifically located on the main mold branch node 501, so the feeding energy of the feed source 4 is mainly located on the main mold branch node 501. Therefore, when the foldable electronic device 100 is in a folded state, when the projections of the main mold branch node 501 of the radiation branch node 5 and the parasitic branch node 6 in the stacking direction of the first main body part 1 and the second main body part 2 at least partially overlap, the larger energy of the feed source 4 can be coupled to the part where the main mold branch node 501 overlaps with the parasitic branch node 6 to stimulate the parasitic branch node 6, thereby effectively improving the radiation efficiency of the parasitic branch node 6.

[0045] Obviously, in some embodiments, the projections of the radiation branch 5 and the parasitic branch 6 in the stacking direction of the first body part 1 and the second body part 2 at least partially overlap, and the non-main-mode branch 501 of the radiation branch 5 may also at least partially overlap with the projection of the parasitic branch 6 in the stacking direction of the first body part 1 and the second body part 2. In this case, although the coupled energy is reduced compared with the case where the projections of the main-mode branch 501 of the radiation branch 5 and the parasitic branch 6 in the stacking direction of the first body part 1 and the second body part 2 at least partially overlap, the radiation efficiency requirement can still be met.

[0046] In some embodiments, as described above, Figure 1-Figure 2 As shown, the radiation branch node 5 is located at the position of the first body 1, which is approximately the same as the position of the parasitic branch node 6 in the second body 2. Therefore, when the foldable electronic device 100 is in a folded state, the projections of the main mode branch node 501 of the radiation branch node 5 and the parasitic branch node 6 in the stacking direction of the first body part 1 and the second body part 2 mostly overlap, so that the larger energy of the feed source 4 can be coupled to the parasitic branch node 6 through the part where the main mode branch node 501 overlaps with the parasitic branch node 6. In addition, the energy of other parts of the radiation branch node 5 can also be coupled to the parasitic branch node 6, which can effectively excite the third resonance mode of the parasitic branch node 6 and improve the radiation efficiency of the parasitic branch node 6.

[0047] in, Figure 1-Figure 2The figures are only for the convenience of presentation, and the radiation branches 5 and the parasitic branches 6 are schematically shown. In actual situations, since the foldable electronic device 100 is coated with exterior paint, or the radiation branches 5 and the parasitic branches 6 are arranged on the inner side of the frame of the foldable electronic device 100, the radiation branches 5 and the parasitic branches 6 are not visible.

[0048] In some embodiments, Figure 1-Figure 2 As shown in the figure, the two opposite first ends 11D of the first main body portion 1 are two opposite short side ends, the two opposite second ends 12D of the first main body portion 1 parallel to the rotating member 3 are two opposite long side ends, the two opposite third ends 21D of the second main body portion 2 are two opposite short side ends, and the two opposite fourth ends 22D of the second main body portion 2 parallel to the rotating member 3 are two opposite long side ends.

[0049] Obviously, in other embodiments, the two opposite first ends 11D of the first main body portion 1 may also be two opposite long side ends, the two opposite second ends 12D of the first main body portion 1 parallel to the rotating member 3 are two opposite short side ends, the two opposite third ends 21D of the second main body portion 2 are two opposite long side ends, and the two opposite fourth ends 22D of the second main body portion 2 parallel to the rotating member 3 are two opposite short side ends.

[0050] Among them, Figure 3 As shown, the first middle frame 11 includes a first side B1 approximately located at the first end 11D where the radiation branch 5 is located and a second side B2 located at the second end 12D where the radiation branch 5 is located, and the second middle frame 21 includes a third side B3 approximately located at the third end 21D where the parasitic branch 6 is located and a fourth side B4 located at the fourth end 22D where the parasitic branch 6 is located. In some embodiments, part of the radiation branch 5 is located at the second end 12D of the first body part 1 away from the rotating member 3, and part of it is located at a first end 11D of the first body part 1, specifically, part of it is arranged on one side of the first side B1 of the first middle frame 11, and part of it is arranged on one side of the second side B2 of the first middle frame 11. Part of the parasitic branch 6 is located at the fourth end 22D of the second body part 2 away from the rotating member 3, and part of it is located at a third end 21D of the second body part 2, specifically, part of it is arranged on one side of the third side B3 of the second middle frame 21, and part of it is arranged on one side of the fourth side B4 of the second middle frame 21.

[0051] That is, in some embodiments, from the inside of the foldable electronic device 100, the radiation branch 5 is specifically partially disposed on one side of the first side B1 of the first middle frame 11, and partially disposed on one side of the second side B2 of the first middle frame 11, and may be adjacent to the first side B1 and the second side B2 of the first middle frame 11. The first parasitic branch 6 is specifically partially disposed on one side of the third side B3 of the second middle frame 21, and partially disposed on one side of the fourth side B4 of the second middle frame 21, and may be adjacent to the third side B3 and the fourth side B4 of the second middle frame 21.

[0052] Wherein, in some embodiments, Figure 1-Figure 3 As shown, the radiation branch 5 and the parasitic branch 6 are both in the shape of long strips, and are both in the shape of bent long strips. The first free end 51 and the second free end 52 are opposite ends in the length direction of the radiation branch 5, and the first ground end 61 and the third free end 61 are opposite ends in the length direction of the parasitic branch 6. The length direction of the radiation branch 5 and the parasitic branch 6 is the extension direction of the longest side of the radiation branch 5 and the parasitic branch 6, and when the radiation branch 5 and the parasitic branch 6 are in the shape of bent long strips, the longest side of the radiation branch 5 and the parasitic branch 6 is a bent side.

[0053] In some embodiments, when the foldable electronic device 100 is in a folded state, the radiation branch 5 is substantially parallel to the parasitic branch 6. Part of the radiation branch 5 is located at the second end 12D of the first body part 1 away from the rotating member 3 and is substantially parallel to the end surface of the second end 12D, another part of the radiation branch 5 is located at the corresponding first end 11D of the first body part 1 and is substantially parallel to the end surface of the corresponding first end 11D, a part of the parasitic branch 6 is located at the fourth end 22D of the second body part 2 away from the rotating member 3 and is substantially parallel to the end surface of the fourth end 22D, another part of the parasitic branch 6 is located at a third end 21D of the second body part 2 and is substantially parallel to the end surface of the third end 21D. Thus, when the foldable electronic device 100 is in a folded state, the two parts of the radiation branch 5 and the two parts of the parasitic branch 6 will be substantially parallel to each other. As a result, the current I2 from the third free end 62 of the parasitic branch 6 to the first grounding end 61 will eventually be basically parallel and in the same direction as the current I1 from the first grounding point G1 to the first free end 51 of the main mode branch 501 of the radiation branch 5, and the current I3 from the second free end 52 to the first free end 51 of the radiation branch 5, thereby enabling the radiation energy of the parasitic branch 6 and the radiation branch 5 to be more effectively enhanced.

[0054] Among them, the aforementioned radiating branches 5 and parasitic branches 6 being roughly parallel to the corresponding end faces all refer to that the length direction of the radiating branches 5 and parasitic branches 6 is roughly parallel to the length direction of the corresponding end faces. For example, the portion of the radiating branches 5 located at the second end 12D of the first main body 1 away from the rotating member 3 and roughly parallel to the end face of the second end 12D refers to that the length direction of the portion of the radiating branches 5 located at the second end 12D of the first main body 1 away from the rotating member 3 is roughly parallel to the length direction of the end face of the second end 12D, the length direction of the portion of the radiating branches 5 located at the second end 12D of the first main body 1 away from the rotating member 3 refers to the extension direction of the longest side of the portion of the radiating branches 5 located at the second end 12D, and the length direction of the end face of the second end 12D is the extension direction of the longest side of the end face of the second end 12D.

[0055] In some embodiments, the main mode branch 501 supports the reception and transmission of electromagnetic wave signals in the first frequency band when working in the first resonance mode, and the electrical length of the main mode branch 501 is λ1 / 4, where λ1 is the electrical length corresponding to the first frequency band. The entire radiation branch 5 supports the reception and transmission of electromagnetic wave signals in the second frequency band when working in the second resonance mode, where the second resonance mode of the entire radiation branch 5 is a balanced mode, and the electrical length of the radiation branch is λ2 / 2, where λ2 is the electrical length corresponding to the second frequency band. The entire parasitic branch 6 supports the reception and transmission of electromagnetic wave signals in the third frequency band when working in the third resonance mode, and the electrical length of the parasitic branch 6 is λ3 / 4, where λ3 is the electrical length corresponding to the third frequency band. Wherein, the first frequency band, the second frequency band and the third frequency band are adjacent frequency bands.

[0056] In some embodiments, the main mode branch 501 constitutes an IFA (inverted F antenna), and the first resonant mode can be an IFA mode of 1 / 4 wavelength from the first ground point G1 to the first free end 51, so that the electrical length of the main mode branch 501 is designed to be λ1 / 4, and the main mode branch 501 supports the reception and transmission of electromagnetic wave signals in the first frequency band when working in the first resonant mode. The second resonant mode of the entire radiation branch 5 is a balanced mode, so that in the balanced mode, when the electrical length of the radiation branch is λ2 / 2, the reception and transmission of electromagnetic wave signals in the first frequency band can be supported. The parasitic branch 6 is mainly a 1 / 4 wavelength resonant mode, and when the electrical length of the parasitic branch 6 is λ3 / 4, the reception and transmission of electromagnetic wave signals in the third frequency band can be supported. The parasitic branch 6 can also be an IFA mode of 1 / 4 wavelength from the first ground end 61 to the third free end 62.

[0057] Therefore, in some embodiments of the present application, the electrical lengths of the entire radiation branch 5 and its main mode branch 501 as well as the parasitic branch 6 itself can be designed to resonate in three adjacent frequency bands.

[0058] The first matching unit M1 of the present application includes an inductor with a relatively small inductance value or a thin metal strip, thereby forming a certain impedance, so that the current will not return to the ground through the first grounding point G1, but will be as described above. Figure 3 As shown, a current I3 is excited from the second free end 52 to the first free end 51 in the entire radiation branch 5 .

[0059] See also Figure 4 , is another schematic diagram of the internal structure of the foldable electronic device 100 in some embodiments of the present application when it is in an unfolded state. Figure 4 The partial internal structure schematic diagram shown is also a schematic diagram of the structure after the shells of the first main body part 1 and the second main body part 2 are removed.

[0060] Among them, Figure 4 As shown, in some embodiments, the radiating branch node 5 also includes a second grounding point G2, which is located between the feeding point F1 and the first free end 51, and the second grounding point G2 is grounded through a second matching unit M2. The second matching unit M2 is an adjustable matching unit, which is used to at least adjust the frequency band supported by the main mode branch node 501 when it operates in the first resonance mode.

[0061] That is, in some embodiments, the feeding point F1 and the first free end 51 also include a second grounding point G2 grounded through a second matching unit M2, which is an adjustable matching unit. By adjusting the matching parameter value of the second matching unit M2, the frequency band supported by the first resonance mode can be adjusted. For example, when the main mode branch node 501 works in the first resonance mode, it originally supports the transmission and reception of electromagnetic wave signals in the first frequency band. Through the second matching unit M2, it can be adjusted to support the transmission and reception of electromagnetic wave signals in other frequency bands, such as the aforementioned second frequency band.

[0062] In some embodiments, the second matching unit M2 may further adjust the second resonance mode in which the radiation branch 5 operates, so as to adjust the frequency band supported by the second resonance mode.

[0063] That is, in some embodiments, since the radiation branch node 5 works in the second resonance mode and the main mode branch node 501 works in the first resonance mode, the main mode branch node 501 is shared, therefore, the second matching unit M2 can also further adjust the second resonance mode in which the radiation branch node 5 works to adjust the frequency band supported by the second resonance mode. For example, through the second matching unit M2, the frequency band supported by the main mode branch node 501 when working in the first resonance mode is adjusted from the first frequency band to other frequency bands, such as the second frequency band, and the frequency band supported by the radiation branch node 5 when working in the second resonance mode as a whole can also be adjusted from the second frequency band to other frequency bands, such as the third frequency band, and so on.

[0064] In some embodiments, Figure 4 As shown, the radiation branch 5 may also include a third grounding point G3, which is located between the feeding point F1 and the second free end 52. The third grounding point G3 is grounded through a third matching unit M3. The third matching unit M3 is an adjustable matching unit for adjusting the second resonance mode of the entire radiation branch 5 to adjust the frequency band supported by the second resonance mode.

[0065] That is, in some embodiments, a third grounding point G3 grounded through a third matching unit M3, which is an adjustable matching unit, is included between the feeding point F1 of the radiating branch 5 and the second free end 52. By adjusting the matching parameter value of the third matching unit M3, the frequency band supported by the second resonant mode can be further adjusted.

[0066] Among them, since the third grounding point G3 is located outside the main mode branch node 501 of the radiation branch node 5, the third matching unit M3 between the third grounding point G3 and the ground can further adjust the entire radiation branch node 5 to work in the frequency band supported by the second resonance mode, and the adjustment ability will be significantly greater than the adjustment ability of the second matching unit M2 to the frequency band supported by the second resonance mode of the entire radiation branch node 5, thereby improving the adjustment efficiency and accuracy.

[0067] Obviously, in other embodiments, the third matching unit M3 and the third grounding point G3 can also be omitted, and as mentioned above, the second matching unit M2 can be used to simultaneously adjust the main mode branch 501 to work in the frequency band supported by the first resonance mode and the radiation branch 5 to work in the frequency band supported by the second resonance mode. In this application, the third matching unit M3 is mainly used as an example for explanation.

[0068] In some embodiments, Figure 4As shown, the parasitic branch 6 includes a fourth grounding point G4, which is close to the third free end 62. The fourth grounding point G4 is grounded through a fourth matching unit M4. The fourth matching unit M4 is an adjustable matching unit, which is used to adjust the third resonance mode in which the entire parasitic branch 6 works, so as to adjust the frequency band supported by the third resonance mode.

[0069] That is, in some embodiments, the parasitic branch 6 also includes a fourth grounding point G4 grounded through a fourth matching unit M3, which is an adjustable matching unit. By adjusting the matching parameter value of the fourth matching unit M3, the frequency band supported by the third resonance mode can be further adjusted.

[0070] Therefore, in the present application, by adding the second matching unit M2, the third matching unit M3 and the fourth matching unit M4 as the above-mentioned adjustable matching units, the frequency bands supported by the first resonance mode, the second resonance mode and the third resonance mode can be adjusted to other frequency bands, thereby improving the frequency band range supported by the foldable electronic device 100 and effectively widening the bandwidth.

[0071] In some embodiments, when the electrical lengths of the entire radiation branch 5 and its main mode branch 501 and the parasitic branch 6 itself can resonate in three adjacent frequency bands, the frequency bands supported by the first resonance mode, the second resonance mode and the third resonance mode are adjusted synchronously by the second matching unit M2, the third matching unit M3 and the fourth matching unit M4 to ensure that after adjustment, the frequency bands supported by the first resonance mode, the second resonance mode and the third resonance mode are still three adjacent frequency bands.

[0072] In some embodiments, the second matching unit M2, the third matching unit M3 and the fourth matching unit M4 may include a plurality of matching elements of inductance and / or capacitance, and the matching parameter value may be specifically a capacitance and / or inductance value, wherein when the matching parameter values ​​corresponding to the second matching unit M2, the third matching unit M3 and the fourth matching unit M4 change, the equivalent electrical length of the main mode branch node 501 will change under the cooperation of the second matching unit M2, for example, it will change to 1 / 4 wavelength corresponding to a certain frequency band, and support the frequency band corresponding to the changed electrical length. Similarly, the equivalent electrical length of the radiation branch node 5 will change in the cooperation of the second matching unit M2, or further in the cooperation of the third matching unit, and support the frequency band corresponding to the changed electrical length. Similarly, the equivalent electrical length of the parasitic branch node 6 will change under the cooperation of the fourth matching unit M4, and support the frequency band corresponding to the changed electrical length.

[0073] See also Figure 5, is a simple structural diagram of the second matching unit M2 in some embodiments of the present application. The second matching unit M2 includes a plurality of matching elements M21 and a plurality of switches SW1, each matching element M21 and a corresponding switch SW1 are connected in series between the second grounding point G2 and the ground to form a series branch Z1, and a plurality of series branches Z1 are connected in parallel between the second grounding point G2 and the ground.

[0074] Each matching element M21 may be an inductor and / or a capacitor, and each matching element M21 has a different matching parameter value, for example, a different capacitance and / or inductance value. Thus, by controlling different switches SW1 to be turned on, it is possible to control the connection of matching elements M21 with different matching parameter values, so that the equivalent electrical length of the main module branch 501 under the cooperation of the second matching unit M2 is different, and the supported frequency bands are also different accordingly.

[0075] Wherein, in some embodiments, Figure 5 As shown, the second matching unit M2 includes a short-circuit switch SW2. When the short-circuit switch SW2 is turned on, the multiple matching elements M21 are all short-circuited, so that the second grounding point G2 is directly connected to the ground. At this time, the second matching unit M2 does not perform matching adjustment. As mentioned above, since the electrical length of the main mode branch node 501 is λ1 / 4, where λ1 is the electrical length corresponding to the first frequency band, the electrical length of the main mode branch node 501 meets the resonance requirement of the first frequency band, and the main mode branch node 501 can resonate in the first frequency band. Therefore, when it is necessary to support the transmission and reception of electromagnetic wave signals in the first frequency band, the second matching unit M2 may not participate in the matching adjustment.

[0076] Obviously, when the main mode branch node 501 needs to support another frequency band, the short-circuit switch SW2 is disconnected, and the switch SW1 in the series branch where the matching element M21 corresponding to a certain frequency band is located is selected to be turned on, so that the matching element M21 participates in the matching adjustment, so that the equivalent electrical length of the main mode branch node 501 with the cooperation of the second matching unit M2 is 1 / 4 of the wavelength corresponding to the certain frequency band, and it can resonate in the certain frequency band, and support the transmission and reception of electromagnetic wave signals in the certain frequency band.

[0077] The structures and working mechanisms of the third matching unit M3 and the fourth matching unit M4 can be similar to those of Figure 5 The second matching unit M2 shown is the same as that shown in the figure. For details, please refer to the relevant content of the second matching unit M2 mentioned above, which will not be repeated here.

[0078] In some embodiments, when the foldable electronic device 100 includes the aforementioned Figure 4In the structure shown, that is, the radiation branch node 5 also includes a second grounding point G2 and a third grounding point G3, the second grounding point G2 is located between the feeding point F1 and the first free end 51, the second grounding point G2 is grounded through the second matching unit M2, the third grounding point G3 is located between the feeding point F1 and the second free end 52, the third grounding point G3 is grounded through the third matching unit M3, the parasitic branch node 6 includes a fourth grounding point G4, the fourth grounding point G4 is close to the third free end 62, when the fourth grounding point G4 is grounded through the fourth matching unit M4, the main mode branch node 501 works in the first resonant mode with the cooperation of the second matching unit M2 and supports the reception and transmission of electromagnetic wave signals in the first frequency band, and the electrical length of the main mode branch node 501 is within the second matching The equivalent electrical length under the cooperation of unit M2 is λ1 / 4, wherein λ1 is the electrical length corresponding to the first frequency band. The entire radiating branch 5 works in the second resonance mode at least under the cooperation of the third matching unit M3 to support the reception and transmission of electromagnetic wave signals in the second frequency band, wherein the second resonance mode of the entire radiating branch 5 is a balanced mode. The equivalent electrical length of the radiating branch 5 under the cooperation of the third matching unit M3 is λ2 / 2, wherein λ2 is the electrical length corresponding to the second frequency band. The entire parasitic branch 6 works in the third resonance mode under the cooperation of the fourth matching unit M4 to support the reception and transmission of electromagnetic wave signals in the third frequency band. The equivalent electrical length of the parasitic branch 6 under the cooperation of the fourth matching unit M4 is λ3 / 4, wherein λ3 is the electrical length corresponding to the third frequency band.

[0079] That is, in some embodiments, when the foldable electronic device 100 also includes the aforementioned second matching unit M2, third matching unit M3 and fourth matching unit M4, the main mode branch 501, the entire radiation branch 5 and the parasitic branch 6 respectively support the reception and transmission of electromagnetic wave signals in the first frequency band, the second frequency band and the third frequency band by making the equivalent electrical length meet the electrical length requirements required for the resonance of the first frequency band, the second frequency band and the third frequency band with the cooperation of the corresponding matching units.

[0080] In some embodiments, when the main mode branch node 501, the entire radiation branch node 5 and the parasitic branch node 6 are such that the equivalent electrical length meets the electrical length requirements for resonance of the first frequency band, the second frequency band and the third frequency band under the cooperation of corresponding matching units, similarly, the second matching unit M2, the third matching unit M3 and the fourth matching unit M4 are all adjustable matching units, and the second matching unit M2 is also used to at least adjust the frequency band supported by the main mode branch node 501 when it works in the first resonance mode, the third matching unit M3 is also used to adjust the frequency band supported by the entire radiation branch node 5 when it works in the second resonance mode, and the fourth matching unit M4 is also used to adjust the frequency band supported by the entire parasitic branch node 6 when it works in the third resonance mode.

[0081] See also Figure 6 , is another simple structural diagram of the second matching unit M2 in some embodiments of the present application. Figure 5 Compared with the second matching unit M2 shown, the second matching unit M2 may only include multiple matching elements M21 and multiple switches SW1, but not the aforementioned short-circuit switch SW2, wherein, similarly, each matching element M21 is connected in series with a corresponding switch SW1 between the second grounding point G2 and the ground to form a series branch Z1, and multiple series branches Z1 are connected in parallel between the second grounding point G2 and the ground.

[0082] Each matching element M21 may be an inductor and / or a capacitor, and each matching element M21 has a different matching parameter value, for example, a different capacitance and / or inductance value. Thus, by controlling different switches SW1 to be turned on, it is possible to control the connection of matching elements M21 with different matching parameter values, so that the equivalent electrical length of the main module branch 501 under the cooperation of the second matching unit M2 is different, and the supported frequency bands are also different accordingly.

[0083] The structures and working mechanisms of the third matching unit M3 and the fourth matching unit M4 can be similar to Figure 6 The second matching unit M2 shown is the same as that shown in the figure. For details, please refer to the relevant content of the second matching unit M2 mentioned above, which will not be repeated here.

[0084] Thus, in some embodiments, the original electrical length of the main mode branch 501, the entire radiation branch 5 and the parasitic branch 6 may not meet the resonance requirements of any frequency band, but by cooperating with the second matching unit M2, the third matching unit M3 and the fourth matching unit M4, the resonance requirements of the corresponding frequency band can be met, and the corresponding frequency band can be adjusted by changing the connected matching element M21 of the second matching unit M2, the third matching unit M3 and the fourth matching unit M4.

[0085] Obviously, in some embodiments, the second matching unit M2, the third matching unit M3 and the fourth matching unit M4 may also be Figure 5 In the structure shown, the main mode branch node 501, the entire radiation branch node 5 and the parasitic branch node 6 respectively support the reception and transmission of electromagnetic wave signals in the three initial frequency bands, namely, the first frequency band, the second frequency band and the third frequency band, by making the equivalent electrical length meet the electrical length requirements of the resonance of the first frequency band, the second frequency band and the third frequency band under the cooperation of the corresponding matching units, and the original electrical length of the main mode branch node 501, the entire radiation branch node 5 and the parasitic branch node 6, that is, the electrical length itself that does not require the cooperation of the matching unit, respectively meets the resonance requirements of the other three frequency bands, so that it can also be achieved through The short-circuit switch SW2 is controlled to be turned on, so that the main mode branch node 501, the entire radiation branch node 5 and the parasitic branch node 6 resonate in the other three frequency bands respectively, that is, the main mode branch node 501, the entire radiation branch node 5 and the parasitic branch node 6 respectively work in the first resonance mode, the second resonance mode and the third resonance mode to support the other three frequency bands respectively. It is also possible to control the other switch SW1 to be turned on and connect other matching elements M21 to make the main mode branch node 501, the entire radiation branch node 5 and the parasitic branch node 6 resonate in the other three frequency bands respectively.

[0086] In some embodiments, the aforementioned first frequency band, second frequency band and third frequency band can be regarded as three default frequency bands supported by the main mode branch node 501, the entire radiation branch node 5 and the parasitic branch node 6 respectively, that is, the main mode branch node 501, the entire radiation branch node 5 and the parasitic branch node 6 respectively support the reception and transmission of electromagnetic wave signals in the first frequency band, the second frequency band and the third frequency band by making the equivalent electrical length meet the requirements of the electrical length required for the resonance of the first frequency band, the second frequency band and the third frequency band under the cooperation of the corresponding matching units, or the main mode branch node 501, the entire radiation branch node 5 and the parasitic branch node 6 themselves have an equivalent electrical length that meets the requirements of the electrical length required for the resonance of the first frequency band, the second frequency band and the third frequency band, and respectively support the reception and transmission of electromagnetic wave signals in the first frequency band, the second frequency band and the third frequency band. When frequency modulation is performed through the second matching unit M2, the third matching unit M3 and the fourth matching unit M4, the first frequency band supported by the main mode branch node 501 can be changed to a frequency band outside the first frequency band, the second frequency band and the third frequency band, for example, it is changed to the fourth frequency band, or it can be changed to one of the second frequency band and the third frequency band; similarly, the second frequency band supported by the entire radiation branch node 5 can be changed to a frequency band outside the first frequency band, the second frequency band and the third frequency band, for example, it is changed to the fifth frequency band, or it can be changed to one of the first frequency band and the third frequency band; the frequency band supported by the parasitic branch node 6 can be changed to a frequency band outside the first frequency band, the second frequency band and the third frequency band, for example, it is changed to the sixth frequency band, or it can be changed to one of the first frequency band and the second frequency band.

[0087] Among them, in the present application, the frequency band supported by the main mode branch node 501 is specifically the frequency band supported by the main mode branch node 501 working in the first resonance mode, the frequency band supported by the entire radiation branch node 5 is specifically the frequency band supported by the entire radiation branch node 5 working in the second resonance mode, and the frequency band supported by the parasitic branch node 6 is specifically the frequency band supported by the parasitic branch node 6 working in the third resonance mode.

[0088] Obviously, in some embodiments, when the foldable electronic device 100 fixedly supports three frequency bands through the radiation branch 5 and its main mode branch 501, and the parasitic branch 6, and does not need to support other frequency bands, the foldable electronic device 100 may include at least one of the second matching unit M2, the third matching unit M3 and the fourth matching unit M4, or may not include the second matching unit M2, the third matching unit M3 and the fourth matching unit M4, and the electrical length required for the resonance of the corresponding frequency band may be satisfied by the corresponding branch and the corresponding matching unit, or the electrical length required for the resonance of the corresponding frequency band may be satisfied by the corresponding branch itself.

[0089] Among them, in the present application, the second matching unit M2, the third matching unit M3 and the fourth matching unit M4 correspond to the second grounding point G2, the third grounding point G3 and the fourth grounding point G4 respectively. When the foldable electronic device 100 does not include one of the second matching unit M2, the third matching unit M3 and the fourth matching unit M4, it also does not include the corresponding one of the second grounding point G2, the third grounding point G3 and the fourth grounding point G4.

[0090] Among them, as mentioned above, the first middle frame 11 and the second middle frame 21 can be the ground of the whole machine. In some embodiments of the present application, when the foldable electronic device 100 includes the second matching unit M2, the third matching unit M3 and the fourth matching unit M4, the second matching unit M2 can be connected between the second grounding point G2 and the first middle frame 11, the third matching unit M3 can be connected between the third grounding point G3 and the first middle frame 11; the fourth matching unit M4 can be connected between the fourth grounding point G4 and the second middle frame 21.

[0091] In some embodiments of the present application, the first resonance mode, the second resonance mode and the third resonance mode are respectively used to support the reception and transmission of electromagnetic wave signals in three frequency bands, wherein the three frequency bands are adjacent frequency bands, specifically, the frequency bands supported by the first resonance mode and the second resonance mode are adjacent frequency bands, and the frequency band supported by the third resonance mode may be adjacent to the frequency band supported by the first resonance mode, or adjacent to the frequency band supported by the second resonance mode.

[0092] See also Figure 7 , is a schematic diagram of return loss parameters of the radiation branch 5 when the foldable electronic device 100 is in the unfolded state in some embodiments of the present application. Among them, Figure 7 Can be Figure 3 or Figure 4 Schematic diagram of return loss obtained by simulation test of the foldable electronic device 100 under the structure shown in FIG. Figure 4 When simulation is performed under the structure shown, the main mode branch 501, the entire radiation branch 5 and the parasitic branch 6 can be made so that the equivalent electrical length meets the electrical length requirement for resonance of the corresponding frequency band through the cooperation of the corresponding matching units.

[0093] in, Figure 7 The trough position of the return loss curve S11 shown in FIG. 1 is roughly the resonant frequency position of a certain frequency band. Figure 7It can be seen that when the foldable electronic device 100 is in the unfolded state, the foldable electronic device 100 can resonate at two resonant frequencies through the radiation branch 5 alone, and support two frequency bands. Figure 7 Schematically illustrates the return loss value S11-1 of the main mode branch 501 working in the frequency band supported by the first resonance mode and the return loss value S11-2 of the entire radiation branch 5 working in the frequency band supported by the second resonance mode when the foldable electronic device 100 is in the unfolded state.

[0094] from Figure 7 It can be seen that when the foldable electronic device 100 is in the unfolded state, the return loss value S11-1 of the frequency band supported by the first resonance mode in which the main mode branch 501 works is approximately -11.8dB, and the return loss value S11-2 of the frequency band supported by the second resonance mode in which the entire radiation branch 5 works is approximately -11dB, both of which are relatively low. It can be seen that since the frequency band supported by the first resonance mode in which the main mode branch 501 works and the frequency band supported by the second resonance mode in which the entire radiation branch 5 works are adjacent frequency bands, the radiation efficiency can be improved and the return loss can be reduced.

[0095] In some embodiments, the frequency band supported by the first resonance mode is between the frequency bands supported by the second resonance mode and the third resonance mode. That is, in some embodiments, the frequency bands supported by the first resonance mode and the second resonance mode are adjacent frequency bands, and the frequency band supported by the third resonance mode is adjacent to the frequency band supported by the first resonance mode.

[0096] Among them, in some embodiments, the main mode branch node 501 can be the branch node that mainly radiates in the above structure of the foldable electronic device 100 of the present application. Therefore, the frequency band supported by the first resonance mode of the main mode branch node 501 is located between the frequency band supported by the second resonance mode of the radiation branch node 5 and the frequency band supported by the third resonance mode of the parasitic branch node 6, which can make both sides of the frequency band supported by the main mode branch node 501 be enhanced by the resonance of the adjacent frequency band, and effectively improve the overall radiation performance of the frequency band supported by the main mode branch node 501. The frequency band supported by the main mode branch node 501 can also improve the frequency band supported by the second resonance mode of the radiation branch node 5 and the frequency band supported by the third resonance mode of the parasitic branch node 6.

[0097] in, Figure 7 The trough portion of the return loss curve S1 shown in FIG. 1 can be regarded as a standing wave, and the number of troughs of the return loss curve S1 is the number of standing waves. Figure 7It can be seen that when the foldable electronic device 100 is in the unfolded state, the foldable electronic device 100 can resonate at two resonant frequencies through the radiation branch 5 alone, and supports two frequency bands, has two trough parts, that is, has two standing waves.

[0098] See also Figure 8 , is a schematic diagram of return loss parameters after the radiation branch 5 and the parasitic branch 6 are coupled when the foldable electronic device 100 in some embodiments of the present application is in a folded state. Among them, Figure 8 It can also be Figure 3 or Figure 4 Schematic diagram of return loss obtained by simulation test of the foldable electronic device 100 under the structure shown in FIG. Figure 4 When simulation is performed under the structure shown, the main mode branch 501, the entire radiation branch 5 and the parasitic branch 6 can be made so that the equivalent electrical length meets the electrical length requirement for resonance of the corresponding frequency band through the cooperation of the corresponding matching units.

[0099] in, Figure 8 The figure illustrates, when the foldable electronic device 100 is in the folded state, the return loss value S11-1 of the main mode branch 501 operating in the frequency band supported by the first resonance mode, the return loss value S11-2 of the entire radiation branch 5 operating in the frequency band supported by the second resonance mode, and the return loss value S11-3 of the parasitic branch 6 operating in the frequency band supported by the third resonance mode.

[0100] from Figure 8 It can be seen that when the foldable electronic device 100 is in the folded state, the return loss value S11-1 of the frequency band supported by the first resonance mode in which the main mode branch 501 works is approximately -16.5dB, the return loss value S11-2 of the frequency band supported by the second resonance mode in which the entire radiation branch 5 works is approximately -13dB, and the return loss value S11-3 of the frequency band supported by the third resonance mode in which the parasitic branch 6 works is approximately -6.3dB, which are all relatively low. It can also be seen that when the foldable electronic device 100 is in the folded state, due to the influence of the parasitic branch 6, the return loss values ​​of the frequency band supported by the main mode branch 501 and the frequency band supported by the entire radiation branch 5 have both decreased significantly, the return loss is lower, and the radiation performance is significantly improved.

[0101] As mentioned above, the trough portion of the return loss curve S1 can be regarded as a standing wave, and the number of troughs of the return loss curve S1 is the number of standing waves. Figure 8It can be seen that when the foldable electronic device 100 is in a folded state, the foldable electronic device 100 can resonate at three resonant frequencies through the radiation branch 5 alone, and supports three frequency bands, has three trough parts, that is, has three standing waves.

[0102] In some embodiments, the three frequency bands respectively supported by the first resonance mode, the second resonance mode, and the third resonance mode are three sub-frequency bands of low frequency.

[0103] like Figure 7 and Figure 8 As shown, the frequency band supported by the first resonance mode in which the main mode branch node 501 works may be the B28 frequency band, and the resonance frequency is approximately 0.74 GHz; the frequency band supported by the second resonance mode in which the entire radiation branch node 5 works may be the B8 frequency band, and the resonance frequency is approximately 0.94 GHz; and the frequency band supported by the third resonance mode in which the parasitic branch node 6 works may be a low-frequency sub-band slightly lower than the B28 frequency band, for example, the B71 frequency band, and the resonance frequency is approximately 0.64 GHz.

[0104] See also Fig. 9 , is a reference schematic diagram of the radiation efficiency and the total system efficiency of the foldable electronic device 100 in some embodiments of the present application in the unfolded state and the folded state. Fig. 9 It can also be Figure 3 or Figure 4 Schematic diagram of radiation efficiency and system total efficiency obtained by simulation test of the foldable electronic device 100 under the structure shown in FIG. Figure 4 When simulation is performed under the structure shown, the main mode branch 501, the entire radiation branch 5 and the parasitic branch 6 can be made so that the equivalent electrical length meets the electrical length requirement for resonance of the corresponding frequency band through the cooperation of the corresponding matching units.

[0105] in, Fig. 9 Schematically illustrated are the radiation efficiency curve Sr1 and the system total efficiency curve St1 when the main mode branch 501 works in the first resonance mode and the radiation branch 5 works in the second resonance mode when the foldable electronic device 100 is in the unfolded state, and the radiation efficiency curve Sr2 and the system total efficiency curve St2 when the main mode branch 501 works in the first resonance mode, the radiation branch 5 works in the second resonance mode, and the parasitic branch 6 works in the third resonance mode when the foldable electronic device 100 is in the folded state.

[0106] like Fig. 9It can be seen that compared with the case where the foldable electronic device 100 is in the unfolded state, when the foldable electronic device 100 is in the folded state, the radiation efficiency and the overall system efficiency are significantly improved when the main mode branch 501 works in the first resonance mode, the radiation branch 5 works in the second resonance mode, and the parasitic branch 6 works in the third resonance mode.

[0107] For example, Fig. 9 As shown, for the frequency band of 0.74 GHz supported by the main mode branch 501 when working in the first resonance mode, the total system efficiency of the foldable electronic device 100 when in the unfolded state is approximately -6.5 dB, and when the foldable electronic device 100 is in the unfolded state, the total system efficiency is increased to -4.9 dB, with an increase of nearly 1.6 dB, and the total system efficiency is significantly improved. For the frequency band of 0.94 GHz supported by the radiation branch 5 when working in the second resonance mode, the total system efficiency of the foldable electronic device 100 when in the unfolded state is approximately -7.8 dB, and when the foldable electronic device 100 is in the unfolded state, the total system efficiency is increased to -7.4 dB, with an increase of nearly 0.4 dB, and the total system efficiency is also improved to a certain extent.

[0108] And as Fig. 9 It can be seen that compared with the foldable electronic device 100 in the unfolded state, the radiation efficiency of the foldable electronic device 100 in the folded state meets the requirements in a wider frequency band, including the frequency band supported by the parasitic branch 6, and the radiation efficiency is greatly improved in the frequency band with a resonant frequency of 0.74 GHz supported by the main mode branch 501, from approximately -6.3 dB to approximately -4.8 dB, which is also increased by about 1.5 dB, and the radiation efficiency is also significantly improved.

[0109] It can be seen that in the present application, when the foldable electronic device 100 is in a folded state, due to the influence of the parasitic branch 6, the radiation efficiency of the frequency band supported by the main mode branch 501 and the frequency band supported by the entire radiation branch 5 and the overall system efficiency are significantly improved, thereby significantly improving the radiation performance.

[0110] See also Fig.10 , is another schematic diagram of the internal structure of the foldable electronic device 100 in some embodiments of the present application when it is in an unfolded state. Fig.10As shown, the foldable electronic device 100 also includes a fifth matching unit M5, which is connected between the feed source 4 and the feeding point F1, wherein the fifth matching unit M5 is used to perform further impedance matching adjustment to improve the overall bandwidth of the three frequency bands achieved by the first resonance mode, the second resonance mode and the third resonance mode.

[0111] in, Fig.10 In the example, the foldable electronic device 100 further includes the aforementioned second matching unit M2, the third matching unit M3, and the fourth matching unit M4. Obviously, in some embodiments, when the foldable electronic device 100 further includes the fifth matching unit M5, the foldable electronic device 100 may not include the aforementioned second matching unit M2, the third matching unit M3, and the fourth matching unit M4, or may only include part of the aforementioned second matching unit M2, the third matching unit M3, and the fourth matching unit M4.

[0112] The fifth matching unit M5 may include a capacitor and / or an inductor, and the inductance and / or capacitance value of the fifth matching unit M5 may match the impedance of the feed source 4 to achieve good impedance matching characteristics.

[0113] See also Fig.11 , which is a reference schematic diagram of the radiation efficiency of the foldable electronic device 100 in some embodiments of the present application when it includes the fifth matching unit M5 and does not include the fifth matching unit M5 in a folded state.

[0114] in, Fig.11 This may include Fig.10 The radiation efficiency curve Sr3 obtained by simulating the structure of the foldable electronic device 100 shown in FIG. Figure 4 The radiation efficiency curve Sr4 is obtained by simulating the structure of the foldable electronic device 100 shown.

[0115] like Fig.11It can be seen that when the foldable electronic device 100 includes the fifth matching unit M5, when the foldable electronic device 100 is in a folded state, from the parasitic branch 6 working in the frequency band supported by the first resonant frequency, to the main mode branch 501 working in the first resonant mode supporting a resonant frequency of approximately 0.74 GHz, to the entire radiation branch 5 working in the second resonant mode supporting a resonant frequency of approximately 0.94 GHz, the overall radiation efficiency is relatively high, with an improvement of nearly 1.5 dB, and there will be no pit of low radiation efficiency shown in the radiation efficiency curve Sr4, and the radiation efficiency can be improved as a whole, ensuring that the three frequency bands can have a high radiation efficiency, so that the radiation efficiency of the entire frequency range including the three frequency bands is relatively high, and the overall bandwidth of the three frequency bands realized by the first resonant mode, the second resonant mode and the third resonant mode is effectively improved.

[0116] Obviously, in some embodiments, the frequency band supported by the first resonance mode in which the main mode branch 501 works, the frequency band supported by the second resonance mode in which the entire radiation branch 5 works, and the frequency band supported by the third resonance mode in which the parasitic branch 6 works can also be any three adjacent low-frequency sub-bands in the B28 band, the B20 band, the B5 band, the B8 band, the B71 band, etc. Therefore, the foldable electronic device 100 of the present application can be applied to low-frequency + low-frequency applications, wherein the foldable electronic device 100 of the present application can be applied to low-frequency inter-band carrier aggregation.

[0117] In other embodiments, the frequency band supported by the first resonance mode in which the main mode branch node 501 operates, the frequency band supported by the second resonance mode in which the entire radiation branch node 5 operates, and the frequency band supported by the third resonance mode in which the parasitic branch node 6 operates can also be three adjacent frequency bands in the medium and high frequency bands, or three adjacent frequency bands in the high frequency band, and so on.

[0118] As mentioned above, the first body portion 1 includes two first ends 11D and two second ends 12D parallel to the rotating member, and the second body portion 2 includes two third ends 21D and two fourth ends 22D parallel to the rotating member 3. In some embodiments, part of the radiation branch 5 is located at the second end 12D of the first body portion 1 away from the rotating member 3, and part is located at a first end 11D of the first body portion 1, and part of the parasitic branch 6 is located at the fourth end 22D of the second body portion 2 away from the rotating member 3, and part is located at a third end 21D of the second body portion 2, wherein the first end 11D where the radiation branch 5 is located and the third end 21D where the parasitic branch 6 is located have the same orientation and are both perpendicular to the rotating member 3. Thus, when the foldable electronic device 100 is in a folded state, the projections of the main mode branch 501 of the radiation branch 5 and the parasitic branch 6 in the stacking direction of the first body portion 1 and the second body portion 2 mostly overlap, and the third resonance mode of the parasitic branch 6 can be greatly excited. In this application, being parallel to the rotating member 3 means being parallel to the rotation center axis of the rotating member 3 , and being perpendicular to the rotating member 3 means being perpendicular to the rotation center axis of the rotating member 3 .

[0119] See also Fig.12 , is another plan view schematically showing a part of the internal structure of the foldable electronic device 100 in some embodiments of the present application in an unfolded state. Fig.12 As shown, in some embodiments, the first main body portion 1 includes two first ends 11D and two second ends 12D parallel to the rotating member, the second main body portion 2 includes two third ends 21D and two fourth ends 22D parallel to the rotating member, the radiating branch 5 is partially located at the second end 12D of the first main body portion 1 away from the rotating member 3, and partially located at a first end 11D of the first main body portion 1, and the parasitic branch 6 is entirely located on the fourth end 22D of the second main body portion 2 away from the rotating member 3.

[0120] Among them, through this structure, the parasitic branch 6 can be set at a position with a certain distance from the third end 21D of the second main body part 2, and it is only necessary to ensure that the projections of the main mold branch 501 of the radiation branch 5 and the parasitic branch 6 in the stacking direction of the first main body part 1 and the second main body part 2 at least partially overlap. Therefore, the first grounding end 61 of the parasitic branch 6 can be prevented from being held by the palm of the user as much as possible.

[0121] Among them, Fig.12As shown, the first grounding point G1 of the radiation branch 5 is located at the second end 12D of the first body part 1 away from the rotating member 3, the first free end 51 of the radiation branch 5 is located at the first end 11D where the radiation branch 5 is located, the first grounding end 61 and the third free end 62 of the parasitic branch 6 are both located at the fourth end 22D of the second body part 2 away from the rotating member 3, and the first grounding end 62 of the parasitic branch 6 is closer to one of the third ends 21D of the second body part 2. One of the third ends 21D of the second body part 2 is the same end as the first end 11D where the radiation branch 5 is located. Thus, in some embodiments, as Fig.12 As shown, the direction from the third free end 62 of the parasitic branch 6 to the first grounding end 61 is at least partially the same as the direction from the first grounding point G1 of the radiation branch 5 to the first free end 51. Therefore, when the current from the third free end 62 to the first grounding end 61 generated by the parasitic branch 6 under the coupling excitation of the feed source 4 is generated, when the current from the first grounding point G1 to the first free end 51 is generated by the main mode branch 501 under the excitation of the feed source 4, the directions of the currents of the two are at least partially the same.

[0122] in, Fig.12 The foldable electronic device 100 shown is different from the aforementioned embodiments only in that the parasitic branch 6 is integrally arranged on the fourth end 22D of the second main body portion 2 away from the rotating member 3, and the other structures may be the structures in any of the aforementioned embodiments. For details, please refer to the contents of any of the aforementioned embodiments.

[0123] See also Fig.13 , the foldable electronic device 100 in some embodiments of the present application adopts Fig.12 Structure and adoption Figure 1 The radiation efficiency of the parasitic branches 6 and the total system efficiency of the structure in the folded state are shown in the schematic diagram.

[0124] in, Fig.13 The foldable electronic device 100 includes Fig.12 In the structure shown in FIG. 1 , when the foldable electronic device 100 is in a folded state, the radiation efficiency curve Sr5 of the parasitic branch 6 and the system total efficiency curve St5, and the foldable electronic device 100 includes Figure 1 When the foldable electronic device 100 is in the folded state, the radiation efficiency curve Sr6 of the parasitic branch 6 and the system total efficiency curve St6 are shown in the structure shown in the figure.

[0125] Among them, from Fig.13 From the perspective of the foldable electronic device 100, Fig.12In the structure shown, that is, the parasitic branch node 6 is integrally arranged on the fourth end 22D of the second main body portion 2 away from the rotating member 3, since the overlapping part with the projection of the main mold branch node 501 of the radiation branch node 5 in the stacking direction of the first main body portion 1 and the second main body portion 2 is reduced, the radiation efficiency and the overall system efficiency of the parasitic branch node 6 are reduced.

[0126] For example, Fig.13 As shown, the foldable electronic device 100 includes Figure 1 When the structure shown in the figure is used, for the parasitic branch 6 working in the third resonance mode, the resonant frequency supported by the frequency band is 0.67 GHz, that is, the B71 frequency band, the total system efficiency is about -6 dB, and the radiation efficiency is about -5.8 dB. Fig.12 In the structure shown, for the resonant frequency of 0.67 GHz supported by the parasitic branch 6 when working in the third resonant mode, the total system efficiency is about -8.2 dB, and the radiation efficiency is about -8 dB.

[0127] However, the foldable electronic device 100 includes Fig.12 In the structure shown, the radiation efficiency and the total system efficiency of the parasitic branch 6 are both reduced by about 2dB, but the total system efficiency is about -8.2dB, and when the radiation efficiency is -8dB, the antenna radiation requirement can be met. As mentioned above, the parasitic branch 6 can be arranged at a position with a certain distance from the third end 21D of the second body portion 2, so that the first grounding end 61 of the parasitic branch 6 can be avoided as much as possible from being held by the palm of the user, etc., so there is also a certain advantage in improving the antenna performance.

[0128] Please return to Figure 2 In some embodiments, as Figure 2 As shown, the end surfaces of the first end 11D and the second end 12D of the first body 1 and the third end 21D and the fourth end 22D of the second body 2 are all rectangular.

[0129] Among them, the first end 11D where the aforementioned radiating branch 5 is located and the second short side end 22D where the parasitic branch 6 is located have the same orientation and are both perpendicular to the rotating member 3, which may mean that the end faces of the first end 11D where the radiating branch 5 is located and the second short side end 22D where the parasitic branch 6 is located have the same orientation and are both perpendicular to the axis of the rotating member 3.

[0130] In some embodiments, the first end 11D where part of the radiation branch 5 is located may be the end of the first body portion 1 located at the bottom of the foldable electronic device 100, wherein when the parasitic branch 6 is also partially located at the second short side end 22D of the second body portion 2, the second short side end 22D where part of the parasitic branch 6 is located is also the end of the second body portion 2 located at the bottom of the foldable electronic device 100. That is, the radiation branch 5 and the parasitic branch 6 may be at least partially disposed at the bottom of the foldable electronic device 100 or disposed close to the bottom of the foldable electronic device 100.

[0131] 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.

[0132] Among them, in the present application, the length of the portion of the radiation branch 5 located at the second end 12D of the first main body part 1 away from the rotating member 3 is significantly greater than the length of the portion located at the first end 11D of the first main body part 1, and since the second resonance mode of the radiation branch 5 as a whole is a balanced mode, the electrical length is λ2 / 2, and therefore, the entire radiation branch 5 can be made longer, and therefore, the length of the portion of the radiation branch 5 located at the second end 12D of the first main body part 1 away from the rotating member 3 is also longer, so that the second free end 52 of the radiation branch 5 can be away from the first end 11D where the portion of the radiation branch 5 is located, that is, away from the bottom of the foldable electronic device 100, for example, the distance between the second free end 52 and the first end 11D where the portion of the radiation branch 5 is located can reach 90 mm (millimeter), thereby largely avoiding the second free end 52 from being held by the user, and effectively ensuring the communication quality.

[0133] Obviously, in some embodiments, the first end 11D where part of the radiating branch 5 is located may be the end of the first main body portion 1 located at the top of the foldable electronic device 100, and when part of the parasitic branch 6 is also located at the second short side end 22D of the second main body portion 2, the second short side end 22D where part of the parasitic branch 6 is located may also be the end of the second main body portion 2 located at the top of the foldable electronic device 100.

[0134] 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.14 As shown, the foldable electronic device 100 further includes a controller 10. When the foldable electronic device 100 includes at least one of the second matching unit M2, the third matching unit M3, and the fourth matching unit M4, the controller 10 is connected to a switch SW1 in at least one of the second matching unit M2, the third matching unit M3, and the fourth matching unit M4, which are the adjustable matching units, and controls the corresponding switch SW1 to be turned on or off, and controls the access to different matching elements M21. When at least one of the second matching unit M2, the third matching unit M3, and the fourth matching unit M4 further includes a short-circuit switch SW2, the controller 10 is also connected to the short-circuit switch SW2, and controls the short-circuit switch SW2 to be turned on or off.

[0135] In some embodiments, the controller 10 can respond to a frequency band switching command, or when it can be determined that frequency band adjustment is currently required based on the signal quality of the communication network in which the foldable electronic device 100 is currently located, control the switch SW1 of the corresponding matching unit to be turned on or off accordingly, and control the frequency bands supported by the first resonance mode, the second resonance mode, and the third resonance mode to be adjusted to corresponding frequency bands.

[0136] Among them, the switch SW1 and the short-circuit switch SW2 can be digitally controlled switches, for example, MOS tubes, BJT transistors, etc. The controller 10 can control the switch SW1 and the short-circuit switch SW2 to be turned on or off accordingly by outputting corresponding level signals to the switch SW1 and the short-circuit switch SW2.

[0137] Please return to Figure 1 etc., wherein Figure 1As shown in the figure, the foldable electronic device 100 further includes a frame 200, and the frame 200 is arranged around the foldable electronic device 100. Part of the radiation branch 5 is arranged at the frame 200 located at the first end 11D of the first main body 1, and part of it is arranged at the frame 200 located at the second end 12D of the first main body 1 away from the rotating member 3. Part of the parasitic branch 6 is arranged at the frame 200 located at the third end 21D of the second main body 2, and part of it is arranged at the frame 200 located at the fourth end 22D of the second main body 2 away from the rotating member 3, or the parasitic branch 6 is arranged as a whole at the frame 200 located at the fourth end 22D of the second main body 2 away from the rotating member 3.

[0138] In some embodiments, the frame 200 of the foldable electronic device 100 is a metal frame, the radiating branch 5 is formed by a metal frame located at the first end 11D of the first main body portion 1 and the second end 12D away from the rotating member 3, the parasitic branch 6 is formed by a metal frame located at the third end 21D of the second main body portion 2 and the fourth end 22D of the second main body portion 2 away from the rotating member 3, or the parasitic branch 6 is formed by a metal frame located at the fourth end 22D of the second main body portion 2 away from the rotating member 3.

[0139] That is, the radiation branch 5 and the parasitic branch 6 are two independent metal frame segments formed by separating the metal frame of the foldable electronic device 100 by opening the gap. For example, the radiation branch 5 is an independent metal frame segment formed by opening a gap in the frame 200 of the first body part 1 which is a metal frame, and the parasitic branch 6 is an independent metal frame segment formed by opening a gap in the frame 200 of the second body part 2 which is a metal frame.

[0140] In other embodiments, the frame 200 of the foldable electronic device 100 is a non-metal frame, the radiating branch 5 is a metal segment arranged in the frame 200 located at the first end 11D of the first main body portion 1 and in the frame 200 located at the second end 12D of the first main body portion 1 away from the rotating member 3, the parasitic branch 6 is a metal segment arranged in the frame 200 located at the third end 21D of the second main body portion 2 and in the fourth end 22D of the second main body portion 2 away from the rotating member 3, or the parasitic branch 6 is a metal segment arranged in the frame 200 located at the fourth end 22D of the second main body portion 2 away from the rotating member 3.

[0141] That is, in some other embodiments, the radiation branch 5 and the parasitic branch 6 are both metal segments arranged in the frame of the foldable electronic device 100.

[0142] 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 5 and the parasitic branch 6 are metal segments arranged in the frame 200 of the foldable electronic device 100.

[0143] 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, plastic, ceramic, etc., the radiation branch 5 and the parasitic branch 6 can be embedded in the frame 200 of the foldable electronic device 100, or be arranged on the inner side of the frame 200 of the foldable electronic device 100.

[0144] In some embodiments, the foldable electronic device 100 also includes an antenna bracket, which is made of insulating material. The radiation branch 5 and the parasitic branch 6 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.

[0145] As mentioned above, the first main body portion 1 includes a first middle frame 11, and the second main body portion 2 includes a second middle frame 21. In some examples, the radiation branch 5 can be set on the first middle frame 11 through an antenna bracket, and the parasitic branch 6 can be set on the second middle frame 21 through an antenna bracket.

[0146] For example, in some embodiments, the two opposite first ends 11D of the first body portion 1 are two opposite short side ends, the two opposite second ends 12D of the first body portion 1 parallel to the rotating member 3 are two opposite long side ends, the two opposite third ends 21D of the second body portion 2 are two opposite short side ends, and the two opposite fourth ends 22D of the second body portion 2 parallel to the rotating member 3 are two opposite long side ends. As described above, when the radiation branches 5 are arranged at the corresponding long side ends and short side ends of the first body portion 1, and the parasitic branches 6 are also arranged at the corresponding long side ends and short side ends of the second body portion 2, as Figure 3As shown, the first middle frame 11 includes a first side B1 approximately located at the first end 11D where the radiation branch 5 is located and a second side B2 located at the second end 12D where the radiation branch 5 is located, and the second middle frame 21 includes a third side B3 approximately located at the third end 21D where the parasitic branch 6 is located and a fourth side B4 located at the fourth end 22D where the parasitic branch 6 is located. In some embodiments, part of the radiation branch 5 is fixed to the first side B1 of the first middle frame 11 by an antenna bracket and is disposed on one side of the first side B1 of the first middle frame 11, and part of the radiation branch 5 is fixed to the second side B2 of the first middle frame 11 by an antenna bracket and is disposed on one side of the second side B2 of the first middle frame 11. Part of the parasitic branch 6 is fixed to the third side B3 of the second middle frame 21 by an antenna bracket and is disposed on one side of the third side B3 of the second middle frame 21, and part of the parasitic branch 6 is fixed to the fourth side B4 of the second middle frame 21 by an antenna bracket and is disposed on one side of the fourth side B4 of the second middle frame 21. Obviously, when the parasitic branch 6 is only provided at the fourth end 22D of the second main body 2, the parasitic branch 6 is fixed to the fourth side B4 of the second middle frame 21 as a whole through the antenna bracket and provided at one side of the fourth side B4 of the second middle frame 21.

[0147] In other embodiments, the radiation branch 5 and the parasitic branch 6 may also be fixed to the frame 200 of the electronic device through the antenna bracket, and located on one side of the corresponding edges of the first middle frame 11 and the second middle frame 22 .

[0148] That is, in some embodiments, the radiation branch 5 and the parasitic branch 6 are fixedly disposed on the antenna bracket formed of insulating material, and then fixed to a suitable position in the electronic device 100 through the antenna bracket.

[0149] Among them, the radiation branch 5 and the parasitic branch 6 can be an FPC (flexible printed circuit) fixed 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.

[0150] 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.

[0151] 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.

[0152] The controller 10 may be a central processing unit, a microcontroller, a single chip microcomputer, a digital signal processor, etc.

[0153] In the present application, when the foldable electronic device 100 is in a folded state, the radiation branch 5 and the parasitic branch 6 can operate in three resonant modes to support the reception and transmission of electromagnetic wave signals in three adjacent frequency bands. The three adjacent frequency bands can enhance the radiation efficiency of each other and enhance the overall antenna performance.

[0154] 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.

[0155] 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; A rotating member connected between the first body portion and the second body portion, wherein the first body portion and the second body portion are rotatably connected through the rotating member; Feeds; A radiation branch, arranged on the first main body, the radiation branch comprises a feeding point, the feeding point is connected to the feed source, and the radiation branch operates in a first resonance mode and a second resonance mode under the excitation of the feed source; A parasitic branch, arranged on the second body portion; Wherein, when the foldable electronic device is in a folded state, the first main body portion and the second main body portion are stacked, the projections of the radiating branch and the parasitic branch in the stacking direction of the first main body portion and the second main body portion at least partially overlap, and the feed source excites the parasitic branch to operate in a third resonant mode through coupling of the radiating branch, wherein the first resonant mode, the second resonant mode and the third resonant mode are respectively used to support the transmission and reception of electromagnetic wave signals in three frequency bands, wherein the three frequency bands are adjacent frequency bands.

2. The foldable electronic device according to claim 1, characterized in that: The radiating branch also includes a first free end, a second free end and a first grounding point. The feeding point is closer to the first free end than the first grounding point. The first grounding point is grounded through a first matching unit. The portion from the first grounding point to the first free end of the radiating branch is a main mode branch of the radiating branch. The main mode branch operates in a first resonance mode under the excitation of the feed source, and the entire radiating branch operates in a second resonance mode under the excitation of the feed source.

3. The foldable electronic device according to claim 2, characterized in that: The parasitic branch includes a first grounding end and a third free end. When the foldable electronic device is in a folded state, the entire parasitic branch operates in a third resonant mode under the coupling excitation of the feed source, and the direction of the current generated by the parasitic branch from the first three free ends to the first grounding end under the coupling excitation of the feed source is at least partially the same as the direction of the current generated by the main mode branch from the first grounding point to the first free end under the excitation of the feed source.

4. The foldable electronic device according to claim 3, characterized in that: The projections of the main mold branch of the radiation branch and the parasitic branch in the stacking direction of the first main body part and the second main body part at least partially overlap.

5. The foldable electronic device according to claim 3, characterized in that: When the main mode branch node works in the first resonance mode, it supports the reception and transmission of electromagnetic wave signals in the first frequency band. The electrical length of the main mode branch node is λ1 / 4, wherein λ1 is the electrical length corresponding to the first frequency band. When the entire radiating branch node works in the second resonance mode, it supports the reception and transmission of electromagnetic wave signals in the second frequency band. The second resonance mode of the entire radiating branch node is a balanced mode. The electrical length of the radiating branch node is λ2 / 2, wherein λ2 is the electrical length corresponding to the second frequency band. When the entire parasitic branch node works in the third resonance mode, it supports the reception and transmission of electromagnetic wave signals in the third frequency band. The electrical length of the parasitic branch node is λ3 / 4, wherein λ3 is the electrical length corresponding to the third frequency band.

6. The foldable electronic device according to claim 5, characterized in that: The radiating branch also includes a second grounding point, which is located between the feeding point and the first free end. The second grounding point is grounded through a second matching unit, and the second matching unit is an adjustable matching unit, which is used to adjust at least the frequency band supported by the main mode branch when it operates in the first resonance mode.

7. The foldable electronic device according to claim 6, characterized in that: The radiating branch also includes a third grounding point, which is located between the feeding point and the second free end. The third grounding point is grounded through a third matching unit, and the third matching unit is an adjustable matching unit for adjusting the frequency band supported by the entire radiating branch when operating in the second resonant mode.

8. The foldable electronic device according to claim 7, characterized in that: The parasitic branch includes a fourth grounding point, which is close to the third free end. The fourth grounding point is grounded through a fourth matching unit. The fourth matching unit is an adjustable matching unit for adjusting the frequency band supported by the entire parasitic branch when it operates in the third resonance mode.

9. The foldable electronic device according to claim 3, characterized in that: The radiating branch also includes a second grounding point and a third grounding point, the second grounding point is located between the feeding point and the first free end, the second grounding point is grounded through a second matching unit, the third grounding point is located between the feeding point and the second free end, the third grounding point is grounded through a third matching unit, and the parasitic branch includes a fourth grounding point, the fourth grounding point is close to the third free end, and the fourth grounding point is grounded through a fourth matching unit; wherein, the main mode branch works in the first resonant mode with the cooperation of the second matching unit and supports the transmission and reception of electromagnetic wave signals in the first frequency band, and the electrical length of the main mode branch is equivalent to the electrical length λ1 under the cooperation of the second matching unit. / 4, wherein λ1 is the electrical length corresponding to the first frequency band, the entire radiating branch works in the second resonance mode with the cooperation of the third matching unit and supports the reception and transmission of electromagnetic wave signals in the second frequency band, wherein the second resonance mode of the entire radiating branch is a balanced mode, and the equivalent electrical length of the radiating branch with the cooperation of the third matching unit is λ2 / 2, wherein λ2 is the electrical length corresponding to the second frequency band, the entire parasitic branch works in the third resonance mode with the cooperation of the fourth matching unit and supports the reception and transmission of electromagnetic wave signals in the third frequency band, and the equivalent electrical length of the parasitic branch with the cooperation of the fourth matching unit is λ3 / 4, wherein λ3 is the electrical length corresponding to the third frequency band.

10. The foldable electronic device according to claim 9, characterized in that: The second matching unit, the third matching unit and the fourth matching unit are all adjustable matching units. The second matching unit is also used to at least adjust the frequency band supported by the main mode branch when it works in the first resonance mode. The third matching unit is also used to adjust the frequency band supported by the entire radiation branch when it works in the second resonance mode. The fourth matching unit is also used to adjust the frequency band supported by the entire parasitic branch when it works in the third resonance mode.

11. The foldable electronic device according to any one of claims 1-10, further comprising a fifth matching unit, wherein the fifth matching unit is connected between the feed source and the feeding point, and the fifth matching unit is used to perform impedance matching adjustment to improve the overall bandwidth of the three frequency bands supported by the first resonance mode, the second resonance mode, and the third resonance mode.

12. The foldable electronic device according to any one of claims 1 to 10, characterized in that: A frequency band supported by the first resonance mode is between frequency bands supported by the second resonance mode and the third resonance mode.

13. The foldable electronic device according to claim 12, characterized in that: The three frequency bands are three sub-frequency bands of low frequency.

14. The foldable electronic device according to any one of claims 1 to 10, characterized in that: The first main body portion includes two first ends and two second ends parallel to the rotating member, the second main body portion includes two third ends and two fourth ends parallel to the rotating member, part of the radiating branch is located at the second end of the first main body portion away from the rotating member, and part of it is located at a first end of the first main body portion, part of the parasitic branch is located at the fourth end of the second main body portion away from the rotating member, and part of it is located at a third end of the second main body portion, wherein the first end where the part of the radiating branch is located has the same orientation as the third end where the part of the parasitic branch is located.

15. The foldable electronic device according to any one of claims 1 to 10, characterized in that: The first main body portion includes two first ends and two second ends parallel to the rotating member, the second main body portion includes two third ends and two fourth ends parallel to the rotating member, part of the radiating branch is located at the second end of the first main body portion away from the rotating member, and part is located at a first end of the first main body portion, and the parasitic branch is located at the fourth end of the second main body portion away from the rotating member.

16. The foldable electronic device according to claim 1, characterized in that: The electronic device comprises a frame, and the radiation branches and the parasitic branches are metal segments arranged on the frame.

17. The foldable electronic device according to claim 16, characterized in that: The frame is a metal frame, and the radiation branches and the parasitic branches are metal frame segments formed by gaps in the metal frame.

18. The foldable electronic device according to claim 16, characterized in that: The frame is a non-metal frame, and the radiation branches and the parasitic branches are metal segments arranged in the frame.

19. The foldable electronic device according to claim 1, characterized in that: The first main body portion includes a first middle frame, the second main body portion includes a second middle frame, the radiation branch is arranged on the first middle frame through an antenna bracket, and the parasitic branch is arranged on the second middle frame through an antenna bracket.

20. According to the foldable electronic device according to claim 19, the radiation branch and the parasitic branch are FPC fixedly arranged on the antenna bracket or LDS metal segments formed on the antenna bracket by laser technology, or PDS metal segments formed on the antenna bracket by PDS technology.

21. The foldable electronic device according to claim 1, characterized in that: The rotating member is a rotating shaft or a hinge.

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