Foldable electronic device

Abstract

The application provides a foldable electronic device, which comprises a foldable main body, a first low-frequency antenna and a second low-frequency antenna. A first radiation section of a first antenna radiator of the first low-frequency antenna is located at a second edge of the foldable main body and is electrically connected with a first feed source; a second radiation section is located at a third edge and is provided with a first grounding point. A third radiation section of a second antenna radiator of the second low-frequency antenna is located at a fourth edge and is provided with a second grounding point; a fourth radiation section is located at the third edge and is connected with the third radiation section; one end of a parasitic radiation section forms a coupling gap with the fourth radiation section, and the other end is grounded through a first tuning circuit; the fourth radiation section or the parasitic radiation section is electrically connected with a second feed source. A first resonant current generated by the first low-frequency antenna is mainly distributed along the second edge, and a second resonant current generated by the second low-frequency antenna is mainly distributed along the third edge. The foldable electronic device provided by the application has good communication performance.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electronics, in particular to a foldable electronic device. BACKGROUND

[0002] Affected by the floor current, the radiation efficiency of the low-frequency antenna in the foldable electronic device in the folded state is reduced to a certain extent compared with that in the unfolded state. Therefore, how to improve the communication performance of the foldable electronic device in the folded state becomes a technical problem to be solved. SUMMARY

[0003] The present application provides a foldable electronic device capable of improving communication performance.

[0004] Specifically, the present application provides a foldable electronic device, comprising:

[0005] a bendable main body, the bendable main body comprising a first main body, a second main body and a hinge assembly, the first main body and the second main body being rotationally connected through the hinge assembly and being capable of assuming a relative folded state or an unfolded state, the bendable main body having a first edge, a second edge, a third edge and a fourth edge connected in sequence, the first edge being located on a side of the first main body away from the hinge assembly, the third edge being located on a side of the second main body away from the hinge assembly;

[0006] a first low-frequency antenna comprising a first antenna radiator and a first feed source, the first antenna radiator comprising a first radiation section and a second radiation section connected in sequence, the first radiation section being located on the second edge and being provided with a first feed point, the first feed point being electrically connected with the first feed source, one end of the first radiation section away from the second radiation section forming a free end of the first antenna radiator, the second radiation section being located on the third edge and being provided with a first grounding point, the first grounding point being grounded; and

[0007] a second low-frequency antenna comprising a second antenna radiator, a second feed source and a first tuning circuit, the second antenna radiator comprising a third radiation section, a fourth radiation section and a parasitic radiation section, the third radiation section being located on the fourth edge and being provided with a second grounding point, the second grounding point being grounded, the fourth radiation section being located on the third edge and being connected with the third radiation section, the parasitic radiation section being located between the fourth radiation section and the second radiation section, one end of the parasitic radiation section forming a coupling gap with the fourth radiation section, and the other end of the parasitic radiation section being grounded through the first tuning circuit, the fourth radiation section or the parasitic radiation section being provided with a second feed point, the second feed point being electrically connected with the second feed source;

[0008] The first resonant current generated by the first low-frequency antenna is mainly distributed along the second edge, and the second resonant current generated by the second low-frequency antenna is mainly distributed along the third edge.

[0009] The foldable electronic device provided in the application includes a bendable main body, a first low-frequency antenna and a second low-frequency antenna. The first antenna radiator of the first low-frequency antenna includes a first radiation section and a second radiation section connected to each other, the first radiation section is located at the second edge of the bendable main body, and the second radiation section is located at the third edge of the bendable main body. The second antenna radiator of the second low-frequency antenna includes a third radiation section, a fourth radiation section and a parasitic radiation section, the third radiation section is connected to the fourth radiation section, the third radiation section is located at the fourth edge of the bendable main body, the fourth radiation section is located at the third edge of the bendable main body, and the parasitic radiation section is located between the fourth radiation section and the second radiation section. That is, the first low-frequency antenna and the second low-frequency antenna are located at two corner positions of the second main body of the bendable electronic device, the first grounding point of the first low-frequency antenna is located at the third edge, and the fourth radiation section, the parasitic radiation section and the second feeding point of the second low-frequency antenna are all located at the third edge. As a result, the current on the radiator of the first low-frequency antenna and the ground current excited thereby, and the current on the radiator of the second low-frequency antenna are less affected by the folding state of the foldable electronic device, thereby improving the communication performance of the foldable electronic device. In addition, the free end of the first antenna radiator is away from the second low-frequency antenna, the first tuning circuit increases the electrical isolation of the first low-frequency antenna and the second low-frequency antenna, the first low-frequency antenna generates the first resonant current mainly distributed along the second edge, and the second low-frequency antenna generates the second resonant current mainly distributed along the third edge, thereby ensuring the isolation between the two low-frequency antennas located at the two corner positions of the second main body, reducing the envelope correlation coefficient of the two low-frequency antennas and realizing the complementarity of the directional diagrams, and thus improving the communication performance of the foldable electronic device. BRIEF DESCRIPTION OF DRAWINGS

[0010] In order to more clearly illustrate the technical solutions of the embodiments of the application, the drawings needed in the embodiments will be briefly introduced as follows.

[0011] Figure 1 A structural schematic diagram of a foldable electronic device including a first low-frequency antenna radiator and a second low-frequency antenna radiator in the related art is shown.

[0012] Figure 2 A structural schematic diagram of a foldable electronic device in different states is shown. Figure 1 A structural schematic diagram of a foldable electronic device in different states is shown.

[0013] Figure 3 A structural schematic diagram of a foldable electronic device in different states is shown. Figure 2 A structural schematic diagram of a foldable electronic device in different states is shown.

[0014] Figure 4The foldable electronic device provided by the embodiments of the present application includes a foldable main body, a first low-frequency antenna, and a second low-frequency antenna.

[0015] Figure 5 The foldable electronic device provided by the embodiments of the present application includes a foldable main body, a first low-frequency antenna, and a second low-frequency antenna. Figure 4 The foldable electronic device provided by the embodiments of the present application includes a foldable main body, a first low-frequency antenna, and a second low-frequency antenna.

[0016] Figure 6 The foldable electronic device provided by the embodiments of the present application includes a foldable main body, a first low-frequency antenna, and a second low-frequency antenna. Figure 5 The foldable electronic device provided by the embodiments of the present application includes a foldable main body, a first low-frequency antenna, and a second low-frequency antenna.

[0017] Figure 7 The foldable electronic device provided by the embodiments of the present application includes a foldable main body, a first low-frequency antenna, and a second low-frequency antenna. Figure 5 The foldable electronic device provided by the embodiments of the present application includes a foldable main body, a first low-frequency antenna, and a second low-frequency antenna.

[0018] Figure 8 The foldable electronic device provided by the embodiments of the present application includes a foldable main body, a first low-frequency antenna, and a second low-frequency antenna. Figure 5 The foldable electronic device provided by the embodiments of the present application includes a foldable main body, a first low-frequency antenna, and a second low-frequency antenna.

[0019] Figure 9 The foldable electronic device provided by the embodiments of the present application includes a foldable main body, a first low-frequency antenna, and a second low-frequency antenna. Figure 5 The foldable electronic device provided by the embodiments of the present application includes a foldable main body, a first low-frequency antenna, and a second low-frequency antenna.

[0020] Figure 10 The foldable electronic device provided by the embodiments of the present application includes a foldable main body, a first low-frequency antenna, and a second low-frequency antenna. Figure 9 The foldable electronic device provided by the embodiments of the present application includes a foldable main body, a first low-frequency antenna, and a second low-frequency antenna.

[0021] Figure 11 The foldable electronic device provided by the embodiments of the present application includes a foldable main body, a first low-frequency antenna, and a second low-frequency antenna. Figure 5 The foldable electronic device provided by the embodiments of the present application includes a foldable main body, a first low-frequency antenna, and a second low-frequency antenna.

[0022] Figure 12 The foldable electronic device provided by the embodiments of the present application includes a foldable main body, a first low-frequency antenna, and a second low-frequency antenna. Figure 11Length of the parasitic radiation section of the illustrated foldable electronic device is less than the sum of the length of the third radiation section and the length of the fourth radiation section between the second connection point and the second ground point Structure diagram

[0023] Figure 13 To Figure 12 The second antenna radiator of the illustrated foldable electronic device generates a resonant current distribution of a second resonant mode under the excitation of the second feed Structure diagram

[0024] Figure 14 To Figure 12 The second antenna radiator of the illustrated foldable electronic device generates a resonant current distribution of a second resonant mode under the excitation of the second feed Structure diagram

[0025] Figure 15 To Figure 12 The illustrated foldable electronic device further comprises a first matching circuit electrically connected between the feed point of the second low-frequency antenna and the second feed Structure diagram

[0026] Figure 16 To Figure 15 The connection between the second edge and the third edge of the illustrated foldable electronic device forms a floor corner point, and the distance between the first ground point and the floor corner point is less than or equal to 1 / 16 wavelength corresponding to the resonant frequency section of the first low-frequency antenna Structure diagram

[0027] Figure 17 To Figure 16 The distribution of the current excited by the first antenna radiator of the illustrated foldable electronic device on the floor of the foldable electronic device Structure diagram

[0028] Figure 18 To Figure 16 The length of the first antenna radiator between the first feed point and the first ground point of the illustrated foldable electronic device is less than or equal to 1 / 2 of the length of the first antenna radiator between the first ground point and the free end of the first antenna radiator Structure diagram

[0029] Figure 19 To Figure 18 The distribution of the resonant current of the third resonant mode generated by the first antenna radiator of the illustrated foldable electronic device under the excitation of the first feed Structure diagram

[0030] Figure 20 To Figure 18 The distribution of the resonant current of the fourth resonant mode generated by the first antenna radiator of the illustrated foldable electronic device under the excitation of the first feed Structure diagram

[0031] Figure 21 To Figure 18The first low-frequency antenna of the foldable electronic device also includes a structure diagram of a second matching circuit electrically connected between the first feed point and the first feed source;

[0032] Figure 22 For Figure 21 The first low-frequency antenna of the foldable electronic device also includes a structure diagram of a second tuning circuit having one end electrically connected to the first antenna radiator and the other end grounded;

[0033] Figure 23 The structure diagram of the foldable electronic device provided by the embodiment of the present application;

[0034] Figure 24 For Figure 23 The radiation efficiency curve of the foldable electronic device;

[0035] Figure 25 For Figure 23 The return loss and isolation curve of the foldable electronic device;

[0036] Figure 26 For Figure 23 The radiation pattern of the first low-frequency antenna in the foldable electronic device;

[0037] Figure 27 For Figure 23 The radiation pattern of the second low-frequency antenna in the foldable electronic device;

[0038] Figure 28 For Figure 23 The envelope correlation coefficient curve of the foldable electronic device;

[0039] Figure 29 For Figure 23 The signal coverage map of the foldable electronic device;

[0040] Figure 30 For Figure 23 The foldable electronic device also includes a first circuit board arranged in the first main body, a second circuit board arranged in the second main body, a radio frequency chip arranged on the first circuit board, and a structure diagram of a plurality of middle-high frequency antennas.

[0041] Explanation of reference signs:

[0042] Foldable electronic device 2000; first low-frequency antenna radiator 21; second low-frequency antenna radiator 22; foldable electronic device 1000; foldable main body 10; first low-frequency antenna 20; second low-frequency antenna 30; first main body 101; second main body 102; hinge assembly 103; first edge 104; second edge 105; third edge 106; fourth edge 107; first sub-edge 150; second sub-edge 151; third sub-edge 170; fourth sub-edge 171; first antenna radiator 201; first feed source 202; first radiating section 210; second radiating section 211; first feed point 2101; free end 2102; first ground point 2110; second antenna radiator 301; second feed source 302; first tuning circuit 303; third radiating section 310; fourth radiating section 311; parasitic radiating section 312; second ground point 3101; second feed point 3110; coupling gap 3120; isolation gap 3121; first connection point 203; second connection point 305; first matching circuit 304; floor corner point 108; second matching circuit 204; second tuning circuit 205; first circuit board 40; second circuit board 50; radio frequency chip 60; medium-high frequency antenna 70; third antenna radiator 701; third feed source 702. DETAILED DESCRIPTION

[0043] The technical solutions provided by the present application will be described clearly and completely below with reference to the drawings. Obviously, the embodiments described in the present application are only part of the embodiments, rather than all the embodiments. Based on the embodiments described in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative effort fall within the protection scope of the present application.

[0044] In the present application, the phrase “embodiment” or “implementation” means that the specific features, structures or characteristics described in connection with the embodiment or implementation can be included in at least one embodiment of the present application. The appearance of this phrase at various places in the specification does not necessarily mean the same embodiment, nor is it an independent or alternative embodiment to other embodiments. A person of ordinary skill in the art can understand explicitly and implicitly that the embodiments described in the present application can be combined with other embodiments.

[0045] The terms “first”, “second”, and the like in the specification of the present application and claims and the above drawings are used to distinguish different objects, rather than to describe a specific order; the terms “include” and “have” and any variations thereof are intended to cover non-exclusive inclusion.

[0046] As Figure 1As shown, in the related art, the foldable electronic device 2000 includes a first low-frequency antenna radiator 21 and a second low-frequency antenna radiator 22. The first low-frequency antenna radiator 21 is located in the upper half of the foldable electronic device 1000, and the second low-frequency antenna radiator 22 is located in the lower half of the foldable electronic device 1000. Among them, the upper half of the foldable electronic device 2000 can be understood as the part of the foldable electronic device 1000 between the folding axis of the foldable electronic device 2000 and the top boundary line of the foldable electronic device 2000. The lower half of the foldable electronic device 2000 can be understood as the part of the foldable electronic device 2000 between the folding axis of the foldable electronic device 2000 and the bottom boundary line of the foldable electronic device 2000. It can be understood that the folding axis of the foldable electronic device 2000 divides the foldable electronic device 2000 into the upper half of the foldable electronic device 2000 and the lower half of the foldable electronic device 2000. The first low-frequency antenna radiator 21 is located in the upper half of the foldable electronic device 2000. The second low-frequency antenna radiator 22 is located in the lower half of the foldable electronic device 2000. Considering that the length of the low-frequency antenna radiator is relatively long, the first low-frequency antenna radiator 21 and the second low-frequency antenna radiator 22 are respectively located at the two folding edges (generally the long edges) of the foldable electronic device 2000. When the foldable electronic device 2000 is folded, the folding edges of the foldable electronic device 2000 are bent until the folding edges of the foldable electronic device 2000 are folded together when the foldable electronic device 2000 is in a folded state. At this time, the floor length corresponding to the first low-frequency antenna radiator 21 and the second low-frequency antenna radiator 22 is halved, and the first low-frequency antenna radiator 21 and the second low-frequency antenna radiator 22 have more reverse currents under floor excitation, resulting in low radiation efficiency of the first low-frequency antenna radiator 21 and the second low-frequency antenna radiator 22, and poor communication performance of the foldable electronic device 2000.

[0047] Please refer to Figure 2 and Figure 3 , Figure 2 for Figure 1 the structure schematic diagram of the foldable electronic device 2000 in different states, Figure 3 for Figure 2 the return loss (S11) curve and the radiation efficiency curve diagram of the foldable electronic device 2000 in different states. Figure 2 Fig. a in the embodiment corresponds to the structure schematic diagram of the foldable electronic device 2000 in an unfolded state. Figure 2 Fig. b in the embodiment corresponds to the structure schematic diagram of the upper half of the foldable electronic device 2000. Figure 2 Fig. c in the embodiment corresponds to the structure schematic diagram of the upper half of the foldable electronic device 2000 and the lower half of the foldable electronic device 2000 folded but not connected.Figure 2 The diagram in Figure d shows the structure of the foldable electronic device 2000 in a folded state. Figure 3 Curve 1 corresponds to the return loss curve of the foldable electronic device 2000 when it is in the unfolded state, i.e. Figure 2 The return loss curve in Figure a. Figure 3 Curve 2 corresponds to the return loss curve of the upper half of the foldable electronic device 2000, that is, it corresponds to... Figure 2 The return loss curve in Figure b. Figure 3 Curve 3 corresponds to the return loss curve when the upper and lower halves of the foldable electronic device 2000 are folded but not connected, i.e., it corresponds to... Figure 2 The return loss curve in Figure c. Figure 3 Curve 4 corresponds to the return loss curve when the foldable electronic device 2000 is in a folded state (i.e., the upper half and lower half of the foldable electronic device 2000 are folded and connected), which corresponds to... Figure 2 The return loss curve in the middle d figure. Figure 3 Curve 5 corresponds to the radiation efficiency curve of the foldable electronic device 2000 in its unfolded state, i.e., the curve that corresponds to... Figure 2 The radiation efficiency curve in Figure a. Figure 3 Curve 6 corresponds to the radiation efficiency curve of the upper half of the foldable electronic device 2000, that is, it corresponds to... Figure 2 The radiation efficiency curve in Figure b. Figure 3 Curve 7 corresponds to the radiation efficiency curve when the upper and lower halves of the foldable electronic device 2000 are folded but not connected, i.e., it corresponds to... Figure 2 The radiation efficiency curve in Figure c. Figure 3 Curve 8 corresponds to the radiation efficiency curve of the foldable electronic device 2000 when it is in a folded state, i.e., it corresponds to... Figure 3 The radiation efficiency curve in the middle d-plot.

[0048] contrast Figure 3 As can be seen from curves 5 and 6, the radiation efficiency of the upper part of the foldable electronic device 2000 decreases compared to its unfolded state. This is because, relative to the unfolded state, the length of the ground plane corresponding to the low-frequency antenna radiator is halved in the upper part of the foldable electronic device 2000. The contribution of the current distribution in the ground plane to the radiation efficiency of the low-frequency antenna radiator decreases, causing the "left sideband" of the radiation efficiency curve to shift to the right, thus resulting in a decrease in the radiation efficiency of the foldable electronic device 2000.

[0049] contrast Figure 4As can be seen from the middle curve 6 and the curve 7, the radiation efficiency of the upper half of the foldable electronic device 2000 when the upper half is folded with the lower half but not connected is lower than the radiation efficiency of the upper half of the foldable electronic device 2000. This is because the radiation efficiency of the foldable electronic device 2000 as a whole is reduced due to the increase of the ground plane by half and the increase of the reverse current when the upper half of the foldable electronic device 2000 is folded with the lower half but not connected compared with the upper half of the foldable electronic device 2000.

[0050] Comparison Figure 4 As can be seen from the middle curve 8 and the curve 7, the radiation efficiency of the foldable electronic device 2000 in the folded state is partially improved compared with the radiation efficiency of the foldable electronic device 2000 when the upper half is folded with the lower half but not connected. This is because the boundary condition is formed and the slot mode is generated when the foldable electronic device 2000 is in the folded state compared with the foldable electronic device 2000 when the upper half is folded with the lower half but not connected, and the radiation efficiency is improved at the resonance position corresponding to the slot mode, but the overall radiation efficiency of the foldable electronic device 2000 is still poor compared with the radiation efficiency of the foldable electronic device 2000 in the unfolded state.

[0051] As can be seen, the layout of the first low-frequency antenna radiator 21 and the second low-frequency antenna radiator 22 of the foldable electronic device 2000 in the related art cannot avoid the efficiency loss of the foldable electronic device 2000 in the folded state. In the N28 frequency band (about 0.7-0.8 GHz), the radiation efficiency decreases by nearly 10 dB.

[0052] Therefore, the application improves the structure and layout of the low-frequency antenna in the foldable electronic device 1000, and provides a foldable electronic device 1000 capable of improving the radiation efficiency and communication performance. Unless otherwise specified, the low-frequency antenna described in the application refers to an antenna with a resonance frequency less than 1 GHz.

[0053] As Figure 4 shown, Figure 4 a structure schematic diagram of a foldable electronic device 1000 provided by an embodiment of the application. The foldable electronic device 1000 can be a foldable mobile phone, a foldable tablet, etc. In the embodiment of the application, the foldable mobile phone is taken as an example. The foldable electronic device 1000 includes a bendable main body 10, a first low-frequency antenna 20 and a second low-frequency antenna 30. Of course, the foldable electronic device 1000 can also include a display screen, a camera, a battery, etc.

[0054] The bendable body 10 comprises a first body 101, a second body 102 and a hinge assembly 103. The first body 101 and the second body 102 are rotatably connected by the hinge assembly 103 and can present a relative folded state or an unfolded state. Specifically, when the bendable body 10 is in the unfolded state, the first body 101 and the second body 102 are unfolded at opposite sides of the hinge assembly 103. Figure 5 That is, a schematic view of the foldable electronic device 1000 in the unfolded state. When the bendable body 10 is in the folded state, the first body 101 and the second body 102 are folded or approximately folded together.

[0055] Please refer to Figure 5 and Figure 6 The bendable body 10 has a first edge 104, a second edge 105, a third edge 106 and a fourth edge 107 connected in sequence. The first edge 104 is oppositely arranged with the third edge 106. The second edge 105 is oppositely arranged with the fourth edge 107. The first edge 104 and the second edge 105, the second edge 105 and the third edge 106, the third edge 106 and the fourth edge 107, and the fourth edge 107 and the first edge 104 are all bendably connected. In a possible implementation, the first edge 104 and the second edge 105, the second edge 105 and the third edge 106, the third edge 106 and the fourth edge 107, and the fourth edge 107 and the first edge 104 can be straight-line bendably connected. In another possible implementation, the first edge 104 and the second edge 105, the second edge 105 and the third edge 106, the third edge 106 and the fourth edge 107, and the fourth edge 107 and the first edge 104 can be circular-arc bendably connected.

[0056] The first edge 104 is located on a side of the first main body 101 away from the hinge assembly 103. The third edge 106 is located on a side of the second main body 102 away from the hinge assembly 103. In other words, the first edge 104 and the third edge 106 are located on opposite sides of the hinge assembly 103, respectively. The second edge 105 includes a first sub-edge 150 located on one side of the hinge assembly 103 and a second sub-edge 151 located on the other side of the hinge assembly 103. The fourth edge 107 includes a third sub-edge 170 located on one side of the hinge assembly 103 and a fourth sub-edge 171 located on the other side of the hinge assembly 103. It can be understood that the first edge 104 and the third edge 106 are non-foldable edges of the foldable main body 10, and the second edge 105 and the fourth edge 107 are foldable edges of the foldable main body 10. In the embodiment of the present application, the first sub-edge 150 and the third sub-edge 170 are located on the same side of the hinge assembly 103; the first edge 104, the first sub-edge 150, and the third sub-edge 170 form an edge of the first main body 101. The second sub-edge 151 and the fourth sub-edge 171 are located on the same side of the hinge assembly 103; the third edge 106, the second sub-edge 151, and the fourth sub-edge 171 form an edge of the second main body 102.

[0057] In the embodiment of the present application, the first main body 101 forms the upper half of the foldable main body 10, and the second main body 102 forms the lower half of the foldable main body 10. It can be understood that in the embodiment of the present application, the first edge 104 is the top edge of the foldable main body 10, and the third edge 106 is the bottom edge of the foldable main body 10. Of course, in other embodiments, the first main body 101 can form the lower half of the foldable main body 10, and the second main body 102 can form the upper half of the foldable main body 10; that is, the first edge 104 can be the bottom edge of the foldable main body 10, and the third edge 106 can be the top edge of the foldable main body 10.

[0058] The first low-frequency antenna 20 includes a first antenna radiator 201 and a first feed source 202. The first antenna radiator 201 is capable of generating a first resonant current under the excitation of the first feed source 202.

[0059] The first antenna radiator 201 can be a frame antenna radiator or an internal antenna radiator. The material of the first antenna radiator 201 can be metal or alloy, etc. Part of the first antenna radiator 201 is located on the second edge 105, and another part of the first antenna radiator 201 is located on the third edge 106. Specifically, the first antenna radiator 201 includes a first radiation section 210 and a second radiation section 211. The first radiation section 210 is located on the second edge 105. In the embodiment of the present application, the first radiation section 210 is located on the second sub-edge 151. The second radiation section 211 is located on the third edge 106.

[0060] The first radiation section 210 and the second radiation section 211 are connected. Optionally, the first radiation section 210 and the second radiation section 211 are directly connected, or the first radiation section 210 and the second radiation section 211 are indirectly connected. In the embodiment of the present application, the first radiation section 210 and the second radiation section 211 are directly connected.

[0061] Since the first antenna radiator 201 includes the first radiation section 210 located at the second edge 105 and the second radiation section 211 located at the third edge 106, the first antenna radiator 201 can generate the first resonant current distributed along the second edge 105 and the first resonant current distributed along the third edge 106 under the excitation of the first feed source 202. In the embodiment of the present application, the first resonant current distributed along the second edge 105 can also be understood as the first resonant current distributed along the longitudinal direction of the foldable electronic device 1000. The first resonant current distributed along the third edge 106 can also be understood as the first resonant current distributed along the transverse direction of the foldable electronic device 1000. In other words, in the embodiment of the present application, the first antenna radiator 201 can generate the first resonant current distributed along the transverse direction of the foldable electronic device 1000 and the first resonant current distributed along the longitudinal direction of the foldable electronic device 1000 under the excitation of the first feed source 202. Since the third edge 106 is the unfolded edge of the foldable body 10, the first resonant current distributed along the third edge 106 is not affected by the folding state of the foldable electronic device 1000, and only the first resonant current distributed along the second edge 105 is affected by the folding state of the foldable electronic device 1000, so that the radiation efficiency of the first low-frequency antenna 20 when the foldable electronic device 1000 is in the folded state can be improved to a certain extent.

[0062] The first radiation section 210 is provided with a first feeding point 2101. The first feeding point 2101 can be understood as a specific position of the first radiation section 210. The first feeding point 2101 can be arranged near one end of the first radiation section 210 away from the second radiation section 211, or the first feeding point 2101 can be arranged near the connection between the first radiation section 210 and the second radiation section 211, or the first feeding point 2101 can be located at the midpoint of the first radiation section 210. The first feeding point 2101 is electrically connected to the first feed source 202. The first feeding point 2101 and the first feed source 202 can be directly electrically connected or indirectly electrically connected. For example, the first feeding point 2101 and the first feed source 202 can be electrically connected through a conductive wire, a conductive column, a conductive sheet, a conductive probe, etc.

[0063] By providing the first radiation section 210 with the first feed point 2101, i.e. the first feed point 2101 is located at the second edge 105, the first antenna radiator 201 is facilitated to excite more first resonant current distributed along the second edge 105, thereby facilitating the first low-frequency antenna 20 to generate the first resonant current mainly distributed along the second edge 105.

[0064] The first radiation section 210 forms a free end 2102 of the first antenna radiator 201 away from the second radiation section 211. The free end 2102 can be understood as an end of the conductive member which is not electrically connected or has a gap with the conductive member. In other words, the end of the first radiation section 210 away from the second radiation section 211 is in an open circuit state.

[0065] By forming the free end 2102 of the first antenna radiator 201 away from the second radiation section 211, the main radiation area of the first antenna radiator 201 is away from the second low-frequency antenna 30, thereby improving the isolation between the first low-frequency antenna 20 and the second low-frequency antenna 30.

[0066] The second radiation section 211 is provided with a first grounding point 2110. The first grounding point 2110 can be understood as a specific position of the second radiation section 211. The first grounding point 2110 can be located at the end of the second radiation section 211 away from the first radiation section 210; or the first grounding point 2110 can be close to the end of the second radiation section 211 away from the first radiation section 210; or the first grounding point 2110 can be close to the connection between the second radiation section 211 and the first radiation section 210; or the first grounding point 2110 can be located at the midpoint of the second radiation section 211. The first grounding point 2110 is grounded. The first resonant current generated by the first antenna radiator 201 can return to ground from the first grounding point 2110.

[0067] Since the second radiation section 211 is located at the third edge 106, by providing the first grounding point 2110 on the second radiation section 211, i.e. the first grounding point 2110 is located at the third edge 106, the first antenna radiator 201 is facilitated to excite more current distributed along the third edge 106 on the reference ground plane of the foldable electronic device 1000. Since the third edge 106 is a non-folded edge of the foldable body 10, the influence of the folded state of the foldable electronic device 1000 on the current excited by the first antenna radiator 201 on the ground plane can be reduced, and the radiation efficiency of the first low-frequency antenna 20 when the foldable electronic device 1000 is in the folded state can be further improved.

[0068] The second low-frequency antenna 30 comprises a second antenna radiator 301, a second feed source 302, and a first tuning circuit 303. The second antenna radiator 301 is capable of generating a second resonant current under the excitation of the second feed source 302.

[0069] The second antenna radiator 301 can be a frame antenna radiator or an internal antenna radiator. The material of the second antenna radiator 301 can be metal or alloy, etc. Part of the second antenna radiator 301 is located at the third edge 106, and another part of the second antenna radiator 301 is located at the fourth edge 107. Specifically, the second antenna radiator 301 comprises a third radiation segment 310, a fourth radiation segment 311, and a parasitic radiation segment 312. The third radiation segment 310 is located at the fourth edge 107. In the embodiment of the present application, the third radiation segment 310 is located at the fourth sub-edge 171. The fourth radiation segment 311 is located at the third edge 106. The parasitic radiation segment 312 is located at the third edge 106, and the parasitic radiation segment 312 is located between the fourth radiation segment 311 and the second radiation segment 211.

[0070] The third radiation segment 310 and the fourth radiation segment 311 are connected. Optionally, the third radiation segment 310 and the fourth radiation segment 311 are directly connected, or the third radiation segment 310 and the fourth radiation segment 311 are indirectly connected. In the embodiment of the present application, the third radiation segment 310 and the fourth radiation segment 311 are directly connected.

[0071] Since the second antenna radiator 301 comprises the fourth radiation segment 311 and the parasitic radiation segment 312 located at the third edge 106, and the third radiation segment 310 located at the fourth edge 107, the second antenna radiator 301 is capable of generating the second resonant current distributed along the third edge 106 and the second resonant current distributed along the fourth edge 107 under the excitation of the second feed source 302. In the embodiment of the present application, the second resonant current distributed along the third edge 106 can also be understood as the second resonant current distributed along the transverse direction of the foldable electronic device 1000. The second resonant current distributed along the fourth edge 107 can also be understood as the second resonant current distributed along the longitudinal direction of the foldable electronic device 1000. In other words, the second antenna radiator 301 is capable of generating the second resonant current distributed along the transverse direction of the foldable electronic device 1000 and the second resonant current distributed along the longitudinal direction of the foldable electronic device 1000 under the excitation of the second feed source 302 in the embodiment of the present application. The third edge 106 is a non-folded edge of the foldable main body 10, so that the second resonant current distributed along the third edge 106 is not affected by the folding state of the foldable electronic device 1000, and only the second resonant current distributed along the fourth edge 107 is affected by the folding state of the foldable electronic device 1000, thereby improving the radiation efficiency of the second low-frequency antenna 30 when the foldable electronic device 1000 is in the folded state to a certain extent.

[0072] The third radiation section 310 is provided with a second grounding point 3101. The second grounding point 3101 can be understood as a specific position of the third radiation section 310. The second grounding point 3101 can be located at an end of the third radiation section 310 away from the fourth radiation section 311; or, the second grounding point 3101 can be located close to an end of the third radiation section 310 away from the fourth radiation section 311; or, the second grounding point 3101 can be located close to a junction of the third radiation section 310 and the fourth radiation section 311; or, the second grounding point 3101 can be located at a midpoint of the third radiation section 310. The second grounding point 3101 is grounded. A second resonant current generated by the second antenna radiator 301 can return to ground from the second grounding point 3101.

[0073] The fourth radiation section 311 or the parasitic radiation section 312 is provided with a second feeding point 3110. In one possible embodiment, as shown in FIG. 4, the fourth radiation section 311 is provided with the second feeding point 3110. In this embodiment, the second feeding point 3110 can be understood as a specific position of the fourth radiation section 311. The second feeding point 3110 can be located close to an end of the fourth radiation section 311 away from the third radiation section 310; or, the second feeding point 3110 can be located close to a junction of the fourth radiation section 311 and the third radiation section 310; or, the second feeding point 3110 can be located at a midpoint of the fourth radiation section 311. Figure 7 Figure 7 In another possible embodiment, as shown in FIG. 5, the parasitic radiation section 312 is provided with the second feeding point 3110. In this embodiment, the second feeding point 3110 can be understood as a specific position of the parasitic radiation section 312. The second feeding point 3110 can be located close to an end of the parasitic radiation section 312 away from the fourth radiation section 311; or, the second feeding point 3110 can be located close to an end of the parasitic radiation section 312 away from the second radiation section 211; or, the second feeding point 3110 can be located at a midpoint of the parasitic radiation section 312.

[0074] The second feeding point 3110 is electrically connected with the second feed source 302. Optionally, the second feeding point 3110 and the second feed source 302 can be directly or indirectly electrically connected. For example, the second feeding point 3110 and the second feed source 302 can be electrically connected through a conductive wire, a conductive column, a conductive sheet, a conductive probe, etc.

[0075] ​The fourth radiation section 311 or the parasitic radiation section 312 is provided with the second feeding point 3110, i.e., the second feeding point 3110 is located at the third edge 106, which facilitates the second antenna radiator 301 to excite the second resonant current mainly distributed along the third edge 106. Since the third edge 106 is a non-folded edge of the foldable main body 10, the influence of the folded state of the foldable electronic device 1000 on the second resonant current of the second antenna radiator 301 can be reduced, the radiation efficiency of the second low-frequency antenna 30 in the folded state of the foldable electronic device 1000 can be improved, and the second low-frequency antenna 30 can be facilitated to generate the second resonant current mainly distributed along the third edge 106.

[0076] As shown in Figure 8 The parasitic radiation section 312 and the fourth radiation section 311 form a coupling gap 3120 between one end of the parasitic radiation section 312 and the fourth radiation section 311. Specifically, the coupling gap 3120 is formed between the one end of the parasitic radiation section 312 close to the fourth radiation section 311 and the fourth radiation section 311. The size of the coupling gap 3120 between the parasitic radiation section 312 and the fourth radiation section 311 can be 0.5mm-2mm. It can be understood that the parasitic radiation section 312 and the fourth radiation section 311 are capacitively coupled or electromagnetically coupled.

[0077] The other end of the parasitic radiation section 312 is grounded through the first tuning circuit 303. Specifically, the other end of the parasitic radiation section 312 away from the fourth radiation section 311 is grounded through the first tuning circuit 303. The first tuning circuit 303 can include switches, capacitors, and / or inductors, etc. The first tuning circuit 303 and the other end of the parasitic radiation section 312 can be directly electrically connected or indirectly electrically connected. For example, the first tuning circuit 303 and the other end of the parasitic radiation section 312 can be electrically connected through a conductive wire, a conductive column, a conductive sheet, a conductive probe, etc.

[0078] Since the parasitic radiation section 312 is located between the fourth radiation section 311 and the second radiation section 211, the other end of the parasitic radiation section 312 is grounded through the first tuning circuit 303, and the first tuning circuit 303 can exhibit different resistance states under the first resonant current generated by the first low-frequency antenna 20 and the second resonant current generated by the second low-frequency antenna 30, thereby being able to electrically isolate or electromagnetically isolate the first low-frequency antenna 20 and the second low-frequency antenna 30 to improve the isolation degree of the first low-frequency antenna 20 and the second low-frequency antenna 30. In addition, the first tuning circuit 303 can switch the resonant frequency band of the second low-frequency antenna 30, so that the second low-frequency antenna 30 can support more frequency bands.

[0079] Optionally, the other end of the parasitic radiation section 312 is connected to the second radiation section 211 or a separation gap is formed between the other end of the parasitic radiation section 312 and the second radiation section 211.

[0080] In one possible embodiment, such as Figure 9 As shown, the other end of the parasitic radiation segment 312 is connected to the second radiation segment 211. In this embodiment, the connection between the other end of the parasitic radiation segment 312 and the second radiation segment 211 means that the other end of the parasitic radiation segment 312 is directly connected to the end of the second radiation segment 211 that is away from the first radiation segment 210; or, the other end of the parasitic radiation segment 312 is indirectly connected to the end of the second radiation segment 211 that is away from the first radiation segment 210 through a conductive element.

[0081] In another possible embodiment, such as Figure 9 As shown, an isolation gap 3121 is formed between the other end of the parasitic radiating section 312 and the second radiating section 211. The size of the isolation gap 3121 between the parasitic radiating section 312 and the second radiating section 211 can be 0.5 mm to 2 mm. The isolation gap 3121 can be filled with non-conductive structural components, etc. In this embodiment, by setting the isolation gap 3121, the isolation between the first antenna radiator 201 and the second antenna radiator 301 can be further improved.

[0082] The first resonant current generated by the first low-frequency antenna 20 is mainly distributed along the second edge 105. The second resonant current generated by the second low-frequency antenna 30 is mainly distributed along the third edge 106.

[0083] Specifically, the first low-frequency antenna 20, under the excitation of the first feed 202, can generate a first resonant current distributed along the second edge 105 and a first resonant current distributed along the third edge 106. The first resonant current distributed along the second edge 105 is the primary current, and the first resonant current distributed along the third edge 106 is the secondary current. In other words, the intensity of the first resonant current distributed along the second edge 105 is greater than the intensity of the first resonant current distributed along the third edge 106. It can be understood that the main radiation direction of the first low-frequency antenna 20 is along the extension direction of the second edge 105, that is, the main radiation direction of the first low-frequency antenna 20 is along the longitudinal direction of the foldable electronic device 1000.

[0084] The second low-frequency antenna 30, under the excitation of the second feed 302, can generate a second resonant current distributed along the third edge 106 and a second resonant current distributed along the fourth edge 107. The second resonant current distributed along the third edge 106 is the primary current, and the second resonant current distributed along the fourth edge 107 is the secondary current. In other words, the intensity of the second resonant current distributed along the third edge 106 is greater than the intensity of the second resonant current distributed along the fourth edge 107. It can be understood that the main radiation direction of the second low-frequency antenna 30 is along the extension direction of the third edge 106, that is, the main radiation direction of the second low-frequency antenna 30 is along the lateral direction of the foldable electronic device 1000.

[0085] In this way, the main radiation direction of the first low-frequency antenna 20 and the main radiation direction of the second low-frequency antenna 30 are orthogonal, so that the isolation of the first low-frequency antenna 20 and the second low-frequency antenna 30 can be further improved, the same-frequency decoupling of the double low-frequency antennas can be realized, and the envelope correlation coefficient of the first low-frequency antenna 20 and the second low-frequency antenna 30 is reduced, so that the directivity pattern of the first low-frequency antenna 20 and the directivity pattern of the second low-frequency antenna 30 are complementary.

[0086] In the embodiments of the present application, the direction of the first edge 104 and the direction of the third edge 106 can be understood as the transverse direction of the foldable electronic device 1000, and the direction of the second edge 105 and the direction of the fourth edge 107 can be understood as the longitudinal direction of the foldable electronic device 1000, which will not be described in detail hereinafter.

[0087] The foldable electronic device 1000 provided by the present application includes a bendable main body 10, a first low-frequency antenna 20 and a second low-frequency antenna 30. The first antenna radiator 201 of the first low-frequency antenna 20 includes a first radiation section 210 and a second radiation section 211 connected to each other, the first radiation section 210 is located at the second edge 105 of the bendable main body 10, and the second radiation section 211 is located at the third edge 106 of the bendable main body 10. The second antenna radiator 301 of the second low-frequency antenna 30 includes a third radiation section 310, a fourth radiation section 311 and a parasitic radiation section 312, the third radiation section 310 is connected to the fourth radiation section 311, the third radiation section 310 is located at the fourth edge 107 of the bendable main body 10, the fourth radiation section 311 is located at the third edge 106 of the bendable main body 10, and the parasitic radiation section 312 is located between the fourth radiation section 311 and the second radiation section 211. That is, the first low-frequency antenna 20 and the second low-frequency antenna 30 are located at two corner positions of the second main body 102 of the bendable main body 10, the first ground point 2110 of the first low-frequency antenna 20 is located at the third edge 106, and the fourth radiation section 311, the parasitic radiation section 312 and the second feeding point 3110 of the second low-frequency antenna 30 are all located at the third edge 106. Therefore, the current on the radiator of the first low-frequency antenna 20 and the ground current excited thereby, and the current on the radiator of the second low-frequency antenna 30 are affected by the folding state of the foldable electronic device 1000 and are reduced, and the communication performance of the foldable electronic device 1000 is improved. In addition, the free end of the first antenna radiator 201 is away from the second low-frequency antenna 30, the first tuning circuit 303 increases the electrical isolation of the first low-frequency antenna 20 and the second low-frequency antenna 30, the first low-frequency antenna 20 generates a first resonant current mainly distributed along the second edge 105, and the second low-frequency antenna 30 generates a second resonant current mainly distributed along the third edge 106, so as to ensure the isolation between the two low-frequency antennas located at the two corner positions of the second main body 102, reduce the envelope correlation coefficient of the two low-frequency antennas, and realize the complementarity of the directivity patterns, thereby improving the communication performance of the foldable electronic device 1000.

[0088] It can be understood that, in the present application, by making the first low-frequency antenna 20 include the first radiating section 210 and the second radiating section 211, the second radiating section 211 is located at the third edge 106, and the second radiating section 211 is provided with the first grounding point 2110, the second low-frequency antenna 30 includes the third radiating section 310, the fourth radiating section 311, and the parasitic radiating section 312, the fourth radiating section 311 and the parasitic radiating section 312 are located at the third edge 106, and the fourth radiating section 311 or the parasitic radiating section 312 is provided with the second feeding point 3110, the influence of the folded state of the foldable electronic device 1000 on the radiation efficiency of the first low-frequency antenna 20 and the radiation efficiency of the second low-frequency antenna 30 is reduced. In addition, by forming a free end of the first antenna radiator 201 at one end of the first radiating section 210 away from the second radiating section 211, the other end of the parasitic radiating section 312 is grounded through the first tuning circuit 303, and the first resonant current generated by the first low-frequency antenna 20 is mainly distributed along the second edge 105, and the second resonant current generated by the second low-frequency antenna 30 is mainly distributed along the third edge 106, the isolation between the first low-frequency antenna 20 and the second low-frequency antenna 30 is improved, the similarity of the directional diagram of the first low-frequency antenna 20 and the directional diagram of the second low-frequency antenna 30 is reduced, and the complementarity of the directional diagram of the first low-frequency antenna 20 and the directional diagram of the second low-frequency antenna 30 is achieved. Further, the communication performance of the foldable electronic device 1000 can be improved.

[0089] In a possible embodiment, as shown in Figure 9 , a connection between the first radiating section 210 and the second radiating section 211 forms a first connection point 203. The length of the second radiating section 211 between the first grounding point 2110 and the first connection point 203 is less than the length of the first radiating section 210.

[0090] The length of the first radiating section 210 can be indicated by L1 in the attached Figure 10 . The length of the second radiating section 211 between the first grounding point 2110 and the first connection point 203 can be indicated by L2 in the attached Figure 11 . It can be understood that L2 is less than L1.

[0091] In a possible implementation, as shown in Figure 11 , the first grounding point 2110 can be located at one end of the second radiating section 211 away from the first radiating section 210. At this time, the length of the second radiating section 211 between the first grounding point 2110 and the first connection point 203 is less than the length of the first radiating section 210, that is, the length of the second radiating section 211 is less than the length of the first radiating section 210.

[0092] For example, the length of the second radiating segment 211 between the first grounding point 2110 and the first connection point 203 may be less than or equal to 1 / 2 the length of the first radiating segment 210; or, the length of the second radiating segment 211 between the first grounding point 2110 and the first connection point 203 may be less than or equal to 1 / 4 the length of the first radiating segment 210.

[0093] The length of the second radiating segment 211 between the first grounding point 2110 and the first connection point 203 is less than the length of the first radiating segment 210. This allows the first resonant current generated by the first antenna radiator 201 under the excitation of the first feed 202, distributed along the second edge 105, to be more abundant. Meanwhile, the first resonant current generated by the first antenna radiator 201 under the excitation of the first feed 202, distributed along the third edge 106, returns to ground from the first grounding point 2110. In other words, the first resonant current generated by the first antenna radiator 201 under the excitation of the first feed 202, distributed along the third edge 106, is less abundant. This is more conducive to ensuring that the first resonant current generated by the first low-frequency antenna 20 is mainly distributed along the second edge 105, thereby improving the isolation between the first low-frequency antenna 20 and the second low-frequency antenna 30, reducing their envelope correlation coefficient, and achieving the complementarity of their radiation patterns, thus improving the communication performance of the foldable electronic device 1000.

[0094] In one possible embodiment, such as Figure 11 As shown, the connection between the third radiating segment 310 and the fourth radiating segment 311 forms a second connection point 305. The sum of the length of the fourth radiating segment 311 and the length of the parasitic radiating segment 312 is greater than the length of the third radiating segment 310 between the second grounding point 3101 and the second connection point 305.

[0095] The sum of the lengths of the fourth radiation segment 311 and the parasitic radiation segment 312 can be found in the appendix. Figure 12 The sum of L3 and L4 is shown. The length of the third radiating segment 310 between the second grounding point 3101 and the second connection point 305 can be referred to the appendix. Figure 12 As shown in L5. Understandably, the sum of L3 and L4 is greater than L5.

[0096] In one possible implementation, the second grounding point 3101 is located at the end of the third radiating segment 310 away from the fourth radiating segment 311. The length of the third radiating segment 310 between the second grounding point 3101 and the second connection point 305 is the length of the third radiating segment 310. In this embodiment, the sum of the length of the fourth radiating segment 311 and the length of the parasitic radiating segment 312 is greater than the length of the third radiating segment 310.

[0097] Optionally, the length of the fourth radiation section 311 can be greater than the length of the parasitic radiation section 312, i.e., L3 can be greater than L4; or the length of the fourth radiation section 311 can be less than or equal to the length of the parasitic radiation section 312, i.e., L3 can be less than or equal to L4.

[0098] The sum of the length of the fourth radiation section 311 and the length of the parasitic radiation section 312 is greater than the length of the third radiation section 310 between the second grounding point 3101 and the second connection point 305, which can make the second antenna radiator 301 generate less second resonant current distributed along the second edge 105 under the excitation of the second feed 302, and the second antenna radiator 301 generate more second resonant current distributed along the third edge 106 under the excitation of the second feed 302, thereby more favorably making the second low-frequency antenna 30 generate second resonant current mainly distributed along the third edge 106, so as to improve the isolation of the first low-frequency antenna 20 and the second low-frequency antenna 30, reduce the envelope correlation coefficient of the two, and achieve the complementarity of the directional diagrams, and improve the communication performance of the foldable electronic device 1000.

[0099] In a possible embodiment, as shown in Figure 12 The length of the parasitic radiation section 312 is less than the sum of the length of the third radiation section 310 and the length of the fourth radiation section 311 between the second grounding point 3101 and the second connection point 305.

[0100] The length of the parasitic radiation section 312 can refer to L4 shown in the attached Figure 13 The sum of the length of the third radiation section 310 and the length of the fourth radiation section 311 between the second grounding point 3101 and the second connection point 305 can refer to the sum of L3 and L5 shown in the attached Figure 14 It can be understood that the sum of L3 and L5 is greater than L4. The sum of the length of the third radiation section 310 and the length of the fourth radiation section 311 between the second grounding point 3101 and the second connection point 305 can be 1 / 4 wavelength corresponding to the resonant frequency band of the second low-frequency antenna 30.

[0101] In a possible implementation, the second grounding point 3101 is located at one end of the third radiation section 310 away from the fourth radiation section 311. The length of the third radiation section 310 is the length of the third radiation section 310 between the second grounding point 3101 and the second connection point 305. In this embodiment, the length of the parasitic radiation section 312 is less than the sum of the length of the third radiation section 310 and the length of the fourth radiation section 311.

[0102] Optionally, the length of the third radiation section 310 can be greater than the length of the fourth radiation section 311, i.e., L5 can be greater than L3; or the length of the third radiation section 310 can be less than or equal to the length of the fourth radiation section 311, i.e., L5 can be less than or equal to L3.

[0103] Please refer to Figure 13 and Figure 14 , the length of the parasitic radiation segment 312 is less than the sum of the length of the third radiation segment 310 and the length of the fourth radiation segment 311 between the second connection point 3101 and the second connection point 305, so that the second antenna radiator 301 generates a first resonant mode as shown by the dashed line in Figure 15 and a second resonant mode as shown by the dashed line in Figure 16 under the excitation of the second feed 302. The first resonant mode includes 1 / 4 wavelength resonant current generated by the third radiation segment 310 and the fourth radiation segment 311 under the excitation of the second feed 302, and there is a strong forward current on the parasitic radiation segment 312 from the first tuning circuit 303 to ground. The second resonant mode includes 1 / 4 wavelength resonant current generated by the third radiation segment 310 and the fourth radiation segment 311 under the excitation of the second feed 302, and there is a strong reverse current from the first tuning circuit 303 to the coupling gap 3120 through the parasitic radiation segment 312. The first resonant mode and the second resonant mode generated by the second antenna radiator 301 under the excitation of the second feed 302 can support different LB frequency bands, so as to expand the resonant frequency band of the second low-frequency antenna 30.

[0104] The parasitic radiation segment 312 has a strong second resonant current in the first resonant mode and the second resonant mode, so as to facilitate the second low-frequency antenna 30 to generate a second resonant current mainly along the third edge 106, so as to improve the isolation between the first low-frequency antenna 20 and the second low-frequency antenna 30, reduce the envelope correlation coefficient of the two, and realize the complementarity of the directional diagram, and improve the communication performance of the foldable electronic device 1000.

[0105] Further, as shown in Figure 16 , the second low-frequency antenna 30 can further include a first matching circuit 304 electrically connected between the second feed point 3110 and the second feed 302. The first matching circuit 304 can include capacitance and / or inductance, etc. The first matching circuit 304 and the second feed point 3110 can be directly electrically connected or indirectly electrically connected. The first matching circuit 304 and the second feed 302 can be directly electrically connected or indirectly electrically connected. The first matching circuit 304 is used to adjust the impedance of the second antenna radiator 301.

[0106] By setting the first matching circuit 304 electrically connected between the second feed point 3110 and the second feed 302, the impedance of the second antenna radiator 301 can be adjusted, so that the second low-frequency antenna 30 has good impedance matching in the first resonant mode and the second resonant mode, thereby improving the radiation efficiency of the second low-frequency antenna 30.

[0107] In a possible embodiment, as shown in Figure 17 the second edge 105 and the third edge 106 form a floor corner point 108. The distance between the first grounding point 2110 and the floor corner point 108 is less than or equal to 1 / 16 wavelength corresponding to the resonant frequency band of the first low-frequency antenna 20.

[0108] The distance between the first grounding point 2110 and the floor corner point 108 can refer to L6 shown in FIG. 10. Figure 17 In this embodiment, the second edge 105 and the third edge 106 are edges of the floor of the foldable electronic device 1000.

[0109] In a possible implementation, the first grounding point 2110 can be located at one end of the second radiation section 211 away from the first radiation section 210. At this time, the distance between the first grounding point 2110 and the floor corner point 108 is less than or equal to 1 / 16 wavelength corresponding to the resonant frequency band of the first low-frequency antenna 20, that is, the length of the second radiation section 211 is less than or equal to 1 / 16 wavelength corresponding to the resonant frequency band of the first low-frequency antenna 20.

[0110] For example, the length of the first antenna radiator 201 can be 1 / 4 wavelength corresponding to the resonant frequency band of the first low-frequency antenna 20. The distance between the first grounding point 2110 and the floor corner point 108 can be less than or equal to 1 / 4 of the length of the first antenna radiator 201; or the distance between the first grounding point 2110 and the floor corner point 108 is less than or equal to 10 mm.

[0111] As shown in Figure 18 When the distance between the first grounding point 2110 and the floor corner point 108 is less than or equal to 1 / 16 wavelength corresponding to the resonant frequency band of the first low-frequency antenna 20, at this time, the current distribution excited by the first antenna radiator 201 on the floor of the foldable electronic device 1000 can refer to the dashed line shown in FIG. 10. Figure 18 The floor of the foldable electronic device 1000 has both the floor current along the second edge 105 and the floor current along the third edge 106, and the maximum angle between the currents excited on the floor of the foldable electronic device 1000 is close to equal to 90°, without 180° of reverse current, so that the current on the floor of the foldable electronic device 1000 can be reduced to offset, thereby reducing the loss of radiation efficiency of the first low-frequency antenna 20 and improving the communication performance of the foldable electronic device 1000.

[0112] In a possible embodiment, as shown in Figure 18As shown, the length of the first antenna radiator 201 between the first feeding point 2101 and the first grounding point 2110 is less than or equal to 1 / 2 of the length of the first antenna radiator 201 between the first grounding point 2110 and the free end 2102 of the first antenna radiator 201.

[0113] As shown, the length of the first antenna radiator 201 between the first feeding point 2101 and the first grounding point 2110 is less than or equal to 1 / 2 of the length of the first antenna radiator 201 between the first grounding point 2110 and the free end 2102 of the first antenna radiator 201. Figure 19 As shown, the length of the first antenna radiator 201 between the first feeding point 2101 and the first grounding point 2110 is less than or equal to 1 / 2 of the length of the first antenna radiator 201 between the first grounding point 2110 and the free end 2102 of the first antenna radiator 201. Figure 20 As shown, the length of the first antenna radiator 201 between the first feeding point 2101 and the first grounding point 2110 is less than or equal to 1 / 2 of the length of the first antenna radiator 201 between the first grounding point 2110 and the free end 2102 of the first antenna radiator 201.

[0114] As shown, the length of the first antenna radiator 201 between the first feeding point 2101 and the first grounding point 2110 is less than or equal to 1 / 2 of the length of the first antenna radiator 201 between the first grounding point 2110 and the free end 2102 of the first antenna radiator 201.

[0115] As shown, the length of the first antenna radiator 201 between the first feeding point 2101 and the first grounding point 2110 is less than or equal to 1 / 2 of the length of the first antenna radiator 201 between the first grounding point 2110 and the free end 2102 of the first antenna radiator 201. Figure 19 As shown, the length of the first antenna radiator 201 between the first feeding point 2101 and the first grounding point 2110 is less than or equal to 1 / 2 of the length of the first antenna radiator 201 between the first grounding point 2110 and the free end 2102 of the first antenna radiator 201. Figure 20 As shown, the length of the first antenna radiator 201 between the first feeding point 2101 and the first grounding point 2110 is less than or equal to 1 / 2 of the length of the first antenna radiator 201 between the first grounding point 2110 and the free end 2102 of the first antenna radiator 201. Figure 21 As shown, the length of the first antenna radiator 201 between the first feeding point 2101 and the first grounding point 2110 is less than or equal to 1 / 2 of the length of the first antenna radiator 201 between the first grounding point 2110 and the free end 2102 of the first antenna radiator 201. Figure 22 As shown, the length of the first antenna radiator 201 between the first feeding point 2101 and the first grounding point 2110 is less than or equal to 1 / 2 of the length of the first antenna radiator 201 between the first grounding point 2110 and the free end 2102 of the first antenna radiator 201.

[0116] Further, the length of the first antenna radiator 201 between the first feeding point 2101 and the first grounding point 2110 is less than or equal to 1 / 2 of the length of the first antenna radiator 201 between the first grounding point 2110 and the free end 2102 of the first antenna radiator 201, which can reduce the cancellation of the reverse current generated on the first antenna radiator 201 between the first feeding point 2101 and the first grounding point 2110 and the resonant current of the third resonant mode and the fourth resonant mode, thereby reducing the loss of the radiation efficiency of the first low-frequency antenna 20 and improving the communication performance of the foldable electronic device 1000.

[0117] Further, as shown in FIG. 2, the first low-frequency antenna 20 can further include a second matching circuit 204 electrically connected between the first feeding point 2101 and the first feed source 202. Figure 23 to Figure 25 The second matching circuit 204 can include a capacitor, an inductor, and / or the like. The second matching circuit 204 can be directly electrically connected to the first feeding point 2101, or indirectly electrically connected to the first feeding point 2101. The second matching circuit 204 can be directly electrically connected to the first feed source 202, or indirectly electrically connected to the first feed source 202. The second matching circuit 204 is configured to adjust the impedance of the first antenna radiator 201.

[0118] By providing the second matching circuit 204 electrically connected between the first feeding point 2101 and the first feed source 202, the impedance of the first antenna radiator 201 can be adjusted, so that the first low-frequency antenna 20 has good impedance matching in the third resonant mode and the fourth resonant mode, thereby improving the radiation efficiency of the first low-frequency antenna 20.

[0119] Further, as shown in FIG. 2, the first low-frequency antenna 20 can further include a second tuning circuit 205, one end of the second tuning circuit 205 being electrically connected to the first antenna radiator 201, and the other end being grounded. Figure 24 The second tuning circuit 205 can include a switch, a capacitor, an inductor, and / or the like. The second tuning circuit 205 can be directly electrically connected to the first antenna radiator 201, or indirectly electrically connected to the first antenna radiator 201.

[0120] Optionally, the second tuning circuit 205 can be electrically connected to the first radiation section 210, or the second tuning circuit 205 can be electrically connected to the second radiation section 211. When the second tuning circuit 205 is electrically connected to the first radiation section 210, the second tuning circuit 205 can be electrically connected between the first feeding point 2101 and the first feed source 202, or electrically connected to another position of the first radiation section 210. When the second tuning circuit 205 is electrically connected to the second radiation section 211, the second tuning circuit 205 can be electrically connected to any position of the second radiation section 211 other than the first grounding point 2110, or electrically connected to the first grounding point 2110.

[0121] By setting the second tuning circuit 205, the resonant frequency band of the first low-frequency antenna 20 can be switched, so that the first low-frequency antenna 20 can support more frequency bands.

[0122] Please refer to Figure 23 , wherein, Figure 25 is the radiation efficiency curve of the foldable electronic device 1000 shown in FIG. 9. Figure 23 is the return loss (S11) and isolation curve of the foldable electronic device 1000 shown in FIG. 10. Figure 24 Figure 24

[0123] Figure 24 Curve 9 in the middle is the radiation efficiency curve of the first low-frequency antenna 20. Figure 24 Curve 10 in the middle is the radiation efficiency curve of the second low-frequency antenna 30. Figure 24 Curve 11 in the middle is the free efficiency curve of the first low-frequency antenna 20. Figure 24 Curve 12 in the middle is the free efficiency curve of the second low-frequency antenna 30. From Figure 25 It can be seen from the curves that the free efficiency of the first low-frequency antenna 20 and the second low-frequency antenna 30 is good. Comparing Figure 25 Curve 11 and curve 12 in the middle can see that the efficiency of the first low-frequency antenna 20 in the low-frequency band is better than that of the second low-frequency antenna 30 in the low-frequency band. In addition, the free efficiency of the first low-frequency antenna 20 in a wider low-frequency band is good, that is, the first low-frequency antenna 20 has a good efficiency bandwidth.

[0124] Figure 25 Curve 13 in the middle is the return loss curve of the first low-frequency antenna 20. Figure 25 Curve 14 in the middle is the return loss curve of the second low-frequency antenna 30. Figure 24 Curve 15 in the middle is the isolation curve of the first low-frequency antenna 20 and the second low-frequency antenna 30. From Figure 25 From curves 13, 14, it can be seen that the first low-frequency antenna 20 and the second low-frequency antenna 30 can both support the low-frequency band of 0.7GHz-0.8GHz. From curve 15, it can be seen that the isolation of the first low-frequency antenna 20 and the second low-frequency antenna 30 in the frequency band of 0.7GHz-0.8GHz is about -12dB, and the isolation between them is good.

[0125] Based on the results of Figure 3 and Figure 26 and the related art Figure 26 ​​It can be seen from the comparison of the results that the foldable electronic device 1000 provided by the application can improve the radiation efficiency of the first low-frequency antenna 20 and the second low-frequency antenna 30 and improve the communication performance of the foldable electronic device 1000 by the following means: the foldable electronic device 1000 is provided with the bendable main body 10, the first low-frequency antenna 20 and the second low-frequency antenna 30; the first antenna radiator 201 of the first low-frequency antenna 20 includes the first radiation section 210 and the second radiation section 211 connected to each other, the first radiation section 210 is located at the second edge 105 of the bendable main body 10, and the second radiation section 211 is located at the third edge 106 of the bendable main body 10; the second antenna radiator 301 of the second low-frequency antenna 30 includes the third radiation section 310, the fourth radiation section 311 and the parasitic radiation section 312, the third radiation section 310 is connected to the fourth radiation section 311, the third radiation section 310 is located at the fourth edge 107 of the bendable main body 10, the fourth radiation section 311 is located at the third edge 106 of the bendable main body 10, and the parasitic radiation section 312 is located between the fourth radiation section 311 and the second radiation section 211; the first feed point 2101 of the first antenna radiator 201 is arranged at the first radiation section 210, the first grounding point 2110 of the first antenna radiator 201 is arranged at the second radiation section 211, the free end 2102 of the first low-frequency antenna 20 is away from the second low-frequency antenna 30, the second feed point 3110 of the second antenna radiator 301 is arranged at the fourth radiation section 311 or the parasitic radiation section 312, the third radiation section 310 is provided with the second grounding point 3101, one end of the parasitic radiation section 312 forms a coupling gap 3120 with the fourth radiation section 311, and the other end of the parasitic radiation section 312 is grounded through the first tuning circuit 303.

[0126] In addition, by forming a first connection point 203 at the connection between the first radiating section 210 and the second radiating section 211, the length of the second radiating section 211 between the first connection point 203 and the first connection point 2110 is less than the length of the first radiating section 210; by forming a second connection point 305 at the connection between the third radiating section 310 and the fourth radiating section 311, the length of the fourth radiating section 311 plus the length of the parasitic radiating section 312 is greater than the length of the third radiating section 310 between the second connection point 305 and the second connection point 3101; the length of the parasitic radiating section 312 is less than the length of the third radiating section 310 between the second connection point 305 and the second connection point 3101 plus the length of the fourth radiating section 311; the second low-frequency antenna 30 can further include a first matching circuit 304 electrically connected between the second feed point 3110 and the second feed source 302; the connection between the second edge 105 and the third edge 106 forms a floor corner point 108, the distance between the first connection point 2110 and the floor corner point 108 is less than or equal to 1 / 16 wavelength corresponding to the resonant frequency band of the first low-frequency antenna 20; the length of the first antenna radiator 201 between the first feed point 2101 and the first connection point 2110 is less than or equal to 1 / 2 of the length of the first antenna radiator 201 between the first connection point 2110 and the free end 2102 of the first antenna radiator 201; the first low-frequency antenna 20 can further include a second matching circuit 204 electrically connected between the first feed point 2101 and the first feed source 202; the first low-frequency antenna 20 further includes a second tuning circuit 205, one end of the second tuning circuit 205 is electrically connected to the first antenna radiator 201, and the other end is grounded; the first resonant current generated by the first low-frequency antenna 20 is mainly distributed along the second edge 105, the second resonant current generated by the second low-frequency antenna 30 is mainly distributed along the third edge 106, and the reverse current excited on the floor by the second low-frequency antenna 30 and the reverse current on the radiator are reduced, and multiple resonance modes of the first low-frequency antenna 20 and the second low-frequency antenna 30 are realized and multiple frequency band switching is supported, thereby further improving the radiation efficiency of the first low-frequency antenna 20 and the radiation efficiency of the second low-frequency antenna 30, improving the isolation between the first low-frequency antenna 20 and the second low-frequency antenna 30, reducing the envelope correlation coefficient of the two, and realizing the complementarity of the directional diagram, which can further improve the communication performance of the foldable electronic device 1000.

[0127] In short, the foldable electronic device 1000 provided by the present application can improve the radiation efficiency of the first low-frequency antenna 20 and the radiation efficiency of the second low-frequency antenna 30 by designing the structure of the first low-frequency antenna 20 and the second low-frequency antenna 30 and designing the layout of the first low-frequency antenna 20 and the second low-frequency antenna 30 on the bendable main body 10, thereby improving the communication performance of the foldable electronic device 1000.

[0128] When the number of nulls in the radiation pattern of the first low-frequency antenna 20 corresponding to the direction of the second edge 105 is greater than the number of nulls in the radiation pattern of the first low-frequency antenna 20 corresponding to the direction of the third edge 106, and / or the amplitude of the nulls in the radiation pattern of the first low-frequency antenna 20 corresponding to the direction of the second edge 105 is greater than the amplitude of the nulls in the radiation pattern of the first low-frequency antenna 20 corresponding to the direction of the third edge 106, it can be considered that the first resonant current generated by the first low-frequency antenna 20 is mainly distributed along the second edge 105.

[0129] In a possible implementation, the number of nulls in the radiation pattern of the first low-frequency antenna 20 corresponding to the direction of the second edge 105 can be greater than the number of nulls in the radiation pattern of the first low-frequency antenna 20 corresponding to the direction of the third edge 106.

[0130] In another possible implementation, the number of nulls in the radiation pattern of the first low-frequency antenna 20 corresponding to the direction of the second edge 105, the number of nulls in the radiation pattern of the first low-frequency antenna 20 corresponding to the direction of the third edge 106 can be the same, and the amplitude of the nulls in the radiation pattern of the first low-frequency antenna 20 corresponding to the direction of the second edge 105 can be greater than the amplitude of the nulls in the radiation pattern of the first low-frequency antenna 20 corresponding to the direction of the third edge 106.

[0131] When the number of nulls in the radiation pattern of the second low-frequency antenna 30 corresponding to the direction of the third edge 106 is greater than the number of nulls in the radiation pattern of the second low-frequency antenna 30 corresponding to the direction of the fourth edge 107, and / or the amplitude of the nulls in the radiation pattern of the second low-frequency antenna 30 corresponding to the direction of the third edge 106 is greater than the amplitude of the nulls in the radiation pattern of the second low-frequency antenna 30 corresponding to the direction of the fourth edge 107, it can be considered that the second resonant current generated by the second low-frequency antenna 30 is mainly distributed along the third edge 106.

[0132] In a possible implementation, the number of nulls in the radiation pattern of the second low-frequency antenna 30 corresponding to the direction of the third edge 106 can be greater than the number of nulls in the radiation pattern of the second low-frequency antenna 30 corresponding to the direction of the fourth edge 107.

[0133] In another possible implementation, the number of nulls in the radiation pattern of the second low-frequency antenna 30 corresponding to the direction of the third edge 106 and the number of nulls in the radiation pattern of the second low-frequency antenna 30 corresponding to the direction of the fourth edge 107 can be the same, and the amplitude of the nulls in the radiation pattern of the second low-frequency antenna 30 corresponding to the direction of the third edge 106 can be greater than the amplitude of the nulls in the radiation pattern of the second low-frequency antenna 30 corresponding to the direction of the fourth edge 107.

[0134] like Figure 23 As shown, Figure 26 for Figure 26 The radiation pattern of the first low-frequency antenna 20 in the foldable electronic device 1000 is shown. Since the first low-frequency antenna 20 includes a first radiating segment 210 located at the second edge 105 and a second radiating segment 211 located at the third edge 106, therefore, from... Figure 26 As can be seen, the radiation pattern of the first low-frequency antenna 20 is a superposition of the patterns generated by the longitudinal and transverse resonant currents. The number of zeros (points a and b) in the radiation pattern of the first low-frequency antenna 20 corresponding to the direction of the second edge 105 is two. The number of zeros (points a and b) in the radiation pattern of the first low-frequency antenna 20 corresponding to the direction of the third edge 106 is zero. The direction corresponding to the second edge 105 in the radiation pattern of the first low-frequency antenna 20 can be referenced... Figure 27 The Y-direction. The direction corresponding to the third edge 106 in the radiation pattern of the first low-frequency antenna 20 can be referenced. Figure 27 The X-direction. Therefore, it can be assumed that the first resonant current generated by the first low-frequency antenna 20 is mainly distributed along the second edge 105.

[0135] like Figure 23 As shown, Figure 27 for Figure 27 The radiation pattern of the second low-frequency antenna 30 in the foldable electronic device 1000 is shown. Since the second low-frequency antenna 30 includes a third radiating segment 310 located at the fourth edge 107, and a fourth radiating segment 311 and a parasitic radiating segment 312 located at the third edge 106, therefore, from... Figure 27 As can be seen, the radiation pattern of the second low-frequency antenna 30 is a superposition of the patterns generated by the longitudinal and transverse resonant currents. The number of nulls in the radiation pattern of the second low-frequency antenna 30 corresponding to the third edge 106 is one (point c), and the number of nulls in the radiation pattern of the second low-frequency antenna 30 corresponding to the fourth edge 107 is one (point d). Furthermore, the amplitude of the nulls in the radiation pattern of the second low-frequency antenna 30 corresponding to the third edge 106 is greater than the amplitude of the nulls in the radiation pattern of the second low-frequency antenna 30 corresponding to the fourth edge 107. The direction corresponding to the third edge 106 in the radiation pattern of the second low-frequency antenna 30 can be referenced...Figure 26 X direction. The direction corresponding to the fourth edge 107 in the radiation pattern of the second low-frequency antenna 30 can refer to Figure 27 Y direction. Thus, it can be considered that the second resonant current generated by the second low-frequency antenna 30 is mainly distributed along the third edge 106.

[0136] In addition, by comparing Figure 28 and Figure 28 , it can be seen that the radiation pattern of the first low-frequency antenna 20 is not similar to the radiation pattern of the second low-frequency antenna 30, that is, the envelope correlation coefficient of the first low-frequency antenna 20 and the second low-frequency antenna 30 is low.

[0137] As shown in Figure 23 , FIG. 8 is an envelope correlation coefficient diagram of the foldable electronic device 1000 shown in Figure 28 From Figure 29 it can be seen that the envelope correlation coefficient of the first low-frequency antenna 20 and the second low-frequency antenna 30 is low in the low-frequency frequency band of 0.7 GHz to 0.8 GHz. Figure 29 As shown in

[0138] , FIG. 9 is a signal coverage diagram of the foldable electronic device 1000 shown in Figure 23 From Figure 29 it can be seen that the signal coverage curve 16 of the first low-frequency antenna 20, Figure 29 the signal coverage curve 17 of the second low-frequency antenna 30. Since the first resonant current generated by the first low-frequency antenna 20 is mainly distributed along the second edge 105, and the second resonant current generated by the second low-frequency antenna 30 is mainly distributed along the third edge 106, that is, the first low-frequency antenna 20 and the second low-frequency antenna 30 both generate transverse current and longitudinal current, and the first low-frequency antenna 20 mainly generates longitudinal current and the second low-frequency antenna 30 mainly generates transverse current, therefore, from Figure 29 it can be seen that the radiation pattern of the first low-frequency antenna 20 and the radiation pattern of the second low-frequency antenna 30 are complementary, omnidirectional coverage can be achieved, the communication performance of the foldable electronic device 1000 can be improved, and the signal coverage integrity of the foldable electronic device 1000 in a weak signal field can be ensured. Figure 30 ​ Further, as shown in , FIG. 10 is a signal coverage diagram of the foldable electronic device 1000 shown in

[0139] From ​As shown, the foldable electronic device 1000 further includes a first circuit board 40 disposed in the first body 101, a second circuit board 50 disposed in the second body 102, a radio frequency chip 60 disposed on the first circuit board 40, and a plurality of middle-high frequency antennas 70. The middle-high frequency antennas 70 include a plurality of third antenna radiators 701 and a plurality of third feed sources 702 corresponding to the plurality of third antenna radiators 701 respectively. The plurality of third feed sources 702 are located on the first circuit board 40 and are electrically connected to the radio frequency chip 60. The first feed source 202 and the second feed source 302 are located on the second circuit board 50 and are electrically connected to the radio frequency chip 60.

[0140] When classified by the number of structural layers, the first circuit board 40 can be one of a single-sided circuit board, a double-sided circuit board, and a multi-layer circuit board. When classified by the bending characteristic, the first circuit board 40 can be one of a flexible circuit board, a rigid circuit board, and a rigid-flexible combined board. When classified by the forming process, the first circuit board 40 can be one of a printed circuit board (PCB), a flexible printed circuit (FPC), a laser direct structuring (LDS), and the like. The first circuit board 40 includes a first ground layer.

[0141] When classified by the number of structural layers, the second circuit board 50 can be one of a single-sided circuit board, a double-sided circuit board, and a multi-layer circuit board. When classified by the bending characteristic, the second circuit board 50 can be one of a flexible circuit board, a rigid circuit board, and a rigid-flexible combined board. When classified by the forming process, the second circuit board 50 can be one of a printed circuit board (PCB), a flexible printed circuit (FPC), a laser direct structuring (LDS), and the like. The second circuit board 50 includes a second ground layer.

[0142] It can be understood that the radio frequency chip 60 is located in the upper half of the foldable electronic device 1000 in the present application. The radio frequency chip 60 provides radio frequency current for the first feed source 202, the second feed source 302, and the third feed source 702.

[0143] The medium-high frequency antenna described in the present application refers to an antenna with a resonant frequency greater than 1 GHz and less than 3 GHz. The present application does not make specific limitations on the number of third antenna radiators 701 and the number of third feed sources 702. For example: the number of third antenna radiators 701 can be two, three, four, five, etc. In the embodiment of the present application, four third antenna radiators 701 are taken as an example. The number of third feed sources 702 can be two, three, four, five, etc. In the embodiment of the present application, four third feed sources 702 are taken as an example. The number of third feed sources 702 can be the same as the number of third antenna radiators 701. The third antenna radiator 701 can be a frame antenna radiator or an internal antenna radiator. The material of the third antenna radiator 701 can be metal or alloy, etc. Multiple third antenna radiators 701 can be located in the first main body 101. Multiple third feed sources 702 are located on the first circuit board 40 in the first main body 101.

[0144] Since the resonant frequency of the medium-high frequency antenna 70 is high, multiple third feed sources 702 are arranged on the first circuit board 40 in the first main body 101, which can facilitate the electrical connection of multiple third feed sources 702 with the radio frequency chip 60, reduce the threading loss caused by the board level difference, and improve the balance of the communication performance of multiple third antenna radiators 701.

[0145] Among them, the first main body 101, the first ground layer of the first circuit board 40, the second main body 102, the second ground layer of the second circuit board 50, and the conductive structure electrically connected to at least one of the first main body 101, the first ground layer of the first circuit board 40, the second main body 102, and the second ground layer of the second circuit board 50 in the foldable electronic device 1000 can form the floor of the foldable electronic device 1000. The floor of the foldable electronic device 1000 is the part of the earth that is considered conductive and is not affected by any grounding configuration. The potential of the floor of the foldable electronic device 1000 is approximately zero.

[0146] In the above embodiments, the first ground point 2110 of the first low-frequency antenna 20 grounding can be understood as the first ground point 2110 of the first low-frequency antenna 20 directly or indirectly electrically connecting the floor of the foldable electronic device 1000. In a possible implementation, the first ground point 2110 of the first low-frequency antenna 20 can be directly or indirectly electrically connected to one of the first main body 101, the first ground layer of the first circuit board 40, the second main body 102, and the second ground layer of the second circuit board 50. The second ground point 3101 of the second low-frequency antenna 30 grounding can be understood as the second ground point 3101 of the second low-frequency antenna 30 directly or indirectly electrically connecting the floor of the foldable electronic device 1000. In a possible implementation, the second ground point 3101 of the second low-frequency antenna 30 can be directly or indirectly electrically connected to one of the first main body 101, the first ground layer of the first circuit board 40, the second main body 102, and the second ground layer of the second circuit board 50. The first tuning circuit 303 grounding can be understood as the first tuning circuit 303 directly or indirectly electrically connecting the floor of the foldable electronic device 1000. In a possible implementation, the first tuning circuit 303 can be directly or indirectly electrically connected to one of the first main body 101, the first ground layer of the first circuit board 40, the second main body 102, and the second ground layer of the second circuit board 50. The other end of the second tuning circuit 205 grounding can be understood as the second tuning circuit 205 directly or indirectly electrically connecting the floor of the foldable electronic device 1000. In a possible implementation, the other end of the second tuning circuit 205 can be directly or indirectly electrically connected to one of the first main body 101, the first ground layer of the first circuit board 40, the second main body 102, and the second ground layer of the second circuit board 50.

[0147] The foldable electronic device 1000 provided in the application reduces the current on the radiator of the first low-frequency antenna 20 and the current on the radiator of the second low-frequency antenna 30 affected by the folding state of the foldable electronic device 1000, improves the communication performance of the foldable electronic device 1000, through the design of the bendable body 10, the first low-frequency antenna 20 and the second low-frequency antenna 30, that is, the first antenna radiator 201 of the first low-frequency antenna 20 includes the first radiation section 210 and the second radiation section 211 connected, the first radiation section 210 is located at the second edge 105 of the bendable body 10, the second radiation section 211 is located at the third edge 106 of the bendable body 10, the second antenna radiator 301 of the second low-frequency antenna 30 includes the third radiation section 310, the fourth radiation section 311 and the parasitic radiation section 312, the third radiation section 310 is connected with the fourth radiation section 311, the third radiation section 310 is located at the fourth edge 107 of the bendable body 10, the fourth radiation section 311 is located at the third edge 106 of the bendable body 10, and the parasitic radiation section 312 is located between the fourth radiation section 311 and the second radiation section 211. In addition, through the free end of the first antenna radiator 201, the first tuning circuit 303 and the first low-frequency antenna 20 generate the first resonant current mainly distributed along the second edge 105, and the second low-frequency antenna 30 generates the second resonant current mainly distributed along the third edge 106, which ensures the isolation between the two low-frequency antennas located in the second body 102 at the same time, reduces the envelope correlation coefficient of the two, and realizes the complementarity of the directional diagram, so as to improve the communication performance of the foldable electronic device 1000.

[0148] The features mentioned in the specification, claims and drawings can be combined with each other in any way within the scope of the application. Although the embodiments of the application have been shown and described above, it should be understood that the above embodiments are exemplary and should not be construed as limiting the application. Those skilled in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the application, and these improvements and refinements are also regarded as the protection scope of the application.

Claims

1. A foldable electronic device, characterized in that, include: A bendable body includes a first body, a second body, and a pivot assembly. The first body and the second body are rotatably connected by the pivot assembly and can be in a folded or unfolded state. The bendable body has a first edge, a second edge, a third edge, and a fourth edge that are connected end to end in sequence. The first edge is located on the side of the first body away from the pivot assembly, and the third edge is located on the side of the second body away from the pivot assembly. A first low-frequency antenna includes a first antenna radiator and a first feed source. The first antenna radiator includes a first radiating segment and a second radiating segment connected together. The first radiating segment is located at the second edge and has a first feed point. The first feed point is electrically connected to the first feed source. The end of the first radiating segment away from the second radiating segment forms a free end of the first antenna radiator. The second radiating segment is located at the third edge and has a first grounding point. The first grounding point is grounded. and The second low-frequency antenna includes a second antenna radiator, a second feed source, and a first tuning circuit. The second antenna radiator includes a third radiating segment, a fourth radiating segment, and a parasitic radiating segment. The third radiating segment is located at the fourth edge and has a second grounding point, which is grounded. The fourth radiating segment is located at the third edge and is connected to the third radiating segment. The parasitic radiating segment is located between the fourth radiating segment and the second radiating segment, and one end of the parasitic radiating segment forms a coupling gap with the fourth radiating segment, while the other end is grounded through the first tuning circuit. The fourth radiating segment or the parasitic radiating segment has a second feed point, which is electrically connected to the second feed source. The first resonant current generated by the first low-frequency antenna is mainly distributed along the second edge, and the second resonant current generated by the second low-frequency antenna is mainly distributed along the third edge.

2. The foldable electronic device according to claim 1, characterized in that, A first connection point is formed at the connection between the first radiation segment and the second radiation segment, and the length of the second radiation segment between the first grounding point and the first connection point is less than the length of the first radiation segment.

3. The foldable electronic device according to claim 1, characterized in that, The connection between the third radiation segment and the fourth radiation segment forms a second connection point, and the sum of the length of the fourth radiation segment and the length of the parasitic radiation segment is greater than the length of the third radiation segment between the second grounding point and the second connection point.

4. The foldable electronic device according to claim 3, characterized in that, The length of the parasitic radiation segment is less than the sum of the lengths of the third radiation segment and the fourth radiation segment between the second grounding point and the second connection point.

5. The foldable electronic device according to claim 1, characterized in that, The connection between the second edge and the third edge forms a floor corner point, and the distance between the first grounding point and the floor corner point is less than or equal to 1 / 16 of the wavelength corresponding to the resonant frequency band of the first low-frequency antenna.

6. The foldable electronic device according to claim 1, characterized in that, The length of the first antenna radiator between the first feed point and the first ground point is less than or equal to 1 / 2 the length of the first antenna radiator between the first ground point and the free end of the first antenna radiator.

7. The foldable electronic device according to any one of claims 1 to 6, characterized in that, The first low-frequency antenna further includes a second tuning circuit, one end of which is electrically connected to the first antenna radiator and the other end is grounded; the other end of the parasitic radiation segment is connected to the second radiation segment or an isolation gap is formed between the other end of the parasitic radiation segment and the second radiation segment.

8. The foldable electronic device according to any one of claims 1 to 6, characterized in that, The number of zeros in the radiation pattern of the first low-frequency antenna corresponding to the second edge is greater than the number of zeros in the radiation pattern of the first low-frequency antenna corresponding to the third edge, and / or the amplitude of the zeros in the radiation pattern of the first low-frequency antenna corresponding to the second edge is greater than the amplitude of the zeros in the radiation pattern of the first low-frequency antenna corresponding to the third edge. The number of zeros in the radiation pattern of the second low-frequency antenna corresponding to the third edge is greater than the number of zeros in the radiation pattern of the second low-frequency antenna corresponding to the fourth edge; and / or, the amplitude of the zeros in the radiation pattern of the second low-frequency antenna corresponding to the third edge is greater than the amplitude of the zeros in the radiation pattern of the second low-frequency antenna corresponding to the fourth edge.

9. The foldable electronic device according to claim 8, characterized in that, The radiation pattern of the first low-frequency antenna has two zeros in the direction corresponding to the second edge, and the radiation pattern of the first low-frequency antenna has zero zeros in the direction corresponding to the third edge.

10. The foldable electronic device according to claim 8, characterized in that, The number of zeros in the radiation pattern of the second low-frequency antenna corresponding to the direction of the third edge is one, the number of zeros in the radiation pattern of the second low-frequency antenna corresponding to the direction of the fourth edge is one, and the amplitude of the zero in the radiation pattern of the second low-frequency antenna corresponding to the direction of the third edge is greater than the amplitude of the zero in the radiation pattern of the second low-frequency antenna corresponding to the direction of the fourth edge.

11. The foldable electronic device according to any one of claims 1 to 6, characterized in that, The radiation pattern of the first low-frequency antenna is complementary to the radiation pattern of the second low-frequency antenna.

12. The foldable electronic device according to any one of claims 1 to 6, characterized in that, The foldable electronic device further includes a first circuit board disposed within the first main body, a second circuit board disposed within the second main body, a radio frequency chip disposed on the first circuit board, and a plurality of mid-to-high frequency antennas. The mid-to-high frequency antennas include a plurality of third antenna radiators and a plurality of third feed sources corresponding to the plurality of third antenna radiators. The plurality of third feed sources are located on the first circuit board and electrically connected to the radio frequency chip. The first feed source and the second feed source are located on the second circuit board and electrically connected to the radio frequency chip.

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