Foldable electronic device

Abstract

The invention provides foldable electronic equipment. The foldable electronic equipment comprises a bendable main body, a reference floor and a first antenna unit, the first antenna unit comprises a first antenna radiator, a parasitic radiator and a first feed source, a first radiation section of the first antenna radiator is arranged on the second frame of the bendable main body, a second radiation section is arranged on the third frame, and one end, far away from the second radiation section, of the first radiation section forms a first grounding end electrically connected with the reference floor; a first feeding point is arranged between the first grounding end and the first free end, the first feeding point is electrically connected with a first feed source, the third radiation section of the parasitic radiator is arranged on the third frame, the fourth radiation section is arranged on the fourth frame of the bendable main body, and the third radiation section is coupled with the second radiation section; the end, away from the third radiation section, of the fourth radiation section forms a second grounding end electrically connected with the reference floor. The first antenna unit generates an E-E radiation mode and an E-E balance mode. The communication performance of the foldable electronic device in the folded state is good.

Description

Technical Field

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

[0002] Affected by the floor current, the radiation efficiency of the antenna unit in the foldable electronic device in the folded state is lower than that in the unfolded state. Therefore, how to improve the communication performance of the foldable electronic device in the folded state has become a technical problem that needs to be solved. Summary of the invention

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

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

[0005] A bendable body, the bendable body comprising a first body, a second body and a rotating shaft assembly, the first body and the second body are rotatably connected through the rotating shaft assembly, and can be in a relatively folded state or an unfolded state, the frame of the bendable body is surrounded to form an accommodating space, the frame of the bendable body comprises a first frame, a second frame, a third frame and a fourth frame which are sequentially connected end to end, the first frame is located on a side of the first body away from the rotating shaft assembly, the third frame is located on a side of the second body away from the rotating shaft assembly, the second frame comprises a first sub-frame located between the first frame and the rotating shaft assembly and a second sub-frame located between the third frame and the rotating shaft assembly, the fourth frame comprises a third sub-frame located between the first frame and the rotating shaft assembly and a fourth sub-frame located between the third frame and the rotating shaft assembly;

[0006] a reference floor located in the accommodation space; and

[0007] A first antenna unit, comprising a first antenna radiator, a parasitic radiator and a first feed source, wherein the first antenna radiator comprises a first radiating section and a second radiating section connected to each other, the first radiating section is arranged on the second sub-frame, the second radiating section is arranged on the third frame, an end of the first radiating section away from the second radiating section forms a first grounding end, the first grounding end is electrically connected to the reference floor, an end of the second radiating section away from the first radiating section forms a first free end, a first feeding point is arranged between the first grounding end and the first free end, the first feeding point is electrically connected to the first feed source, the parasitic radiator comprises a third radiating section and a fourth radiating section connected to each other, the third radiating section is arranged on the third frame, the fourth radiating section is arranged on the fourth sub-frame, an end of the third radiating section away from the fourth radiating section forms a second free end, a coupling gap is formed between the second free end and the first free end, an end of the fourth radiating section away from the third radiating section forms a second grounding end, and the second grounding end is electrically connected to the reference floor;

[0008] Among them, the first feed source is used to excite the first antenna radiator and the parasitic radiator to generate a first resonant mode and a second resonant mode supporting a low frequency band, the first resonant mode is an EE radiation mode between the first antenna radiator and the parasitic radiator, and the second resonant mode is an EE balanced mode between the first antenna radiator and the parasitic radiator.

[0009] The foldable electronic device provided by the present application includes a bendable body, a reference floor and a first antenna unit, wherein the first antenna unit includes a first antenna radiator, a parasitic radiator and a first feed source, wherein the first radiating section of the first antenna radiator is arranged at the second sub-frame of the bendable body, the second radiating section of the first antenna radiator is arranged at the third frame of the bendable body, the third radiating section of the parasitic radiator is arranged at the third frame of the bendable body, and the fourth radiating section of the parasitic radiator is arranged at the fourth sub-frame of the bendable body, that is, the first antenna radiator is arranged at the side frame of the second body away from the frame of the hinge assembly and one side of the second body, and the parasitic radiator is arranged at the side frame of the second body away from the frame of the hinge assembly and the other side of the second body. The end of the second radiating section away from the first radiating section forms a first free end, the end of the third radiating section away from the fourth radiating section forms a second free end, and a coupling gap is formed between the second free end and the first free end, so that the resonant current of the first resonant mode and the resonant current of the second resonant mode generated by the first antenna unit under the excitation of the first feed source are more distributed in the first antenna radiator and the parasitic radiator, which is conducive to concentrating the radiation energy of the first antenna unit on the second body. In addition, the end of the first radiation section away from the second radiation section forms a first grounding end, the end of the fourth radiation section away from the third radiation section forms a second grounding end, and the first grounding end and the second grounding end are electrically connected to a reference floor located in the accommodation space of the bendable body, so that under the excitation of the first antenna radiator and the parasitic radiator, the current of the reference floor is mainly distributed between the first grounding end and the second grounding end and is roughly distributed along the connection direction of the first grounding end and the second grounding end, further making the radiation energy of the first antenna unit concentrated on the second body. In addition, the influence of the bending state of the first body and the second body on the radiation efficiency of the first antenna unit is reduced, and the communication performance of the foldable electronic device in the folded state can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments are briefly introduced below.

[0011] Figure 1 A schematic diagram of the structure of a foldable electronic device provided in an embodiment of the present application includes a bendable body, a reference floor, and a first antenna unit;

[0012] Figure 2 for Figure 1 A schematic diagram of a structure in which a first antenna radiator and a parasitic radiator of a first antenna unit of a foldable electronic device are arranged on a frame of a bendable body;

[0013] Figure 3 for Figure 2 A schematic structural diagram of the first antenna unit shown;

[0014] Figure 4 for Figure 1 Another structural schematic diagram showing that the first antenna radiator and the parasitic radiator of the first antenna unit of the foldable electronic device are arranged on the frame of the bendable body;

[0015] Figure 5 for Figure 2 The first antenna unit of the foldable electronic device further includes a structural schematic diagram of a first tuning circuit;

[0016] Figure 6 for Figure 5 A schematic structural diagram showing that the length of the first radiation section of the first antenna unit of the foldable electronic device is greater than the length of the fourth radiation section;

[0017] Figure 7 for Figure 5 A schematic structural diagram showing that the length of the first radiation section of the first antenna unit of the foldable electronic device is smaller than the length of the fourth radiation section;

[0018] Figure 8 for Figure 5 A schematic diagram of current distribution of a first resonant current and a second resonant current generated by a first antenna unit of the foldable electronic device;

[0019] Fig. 9 for Figure 5 A schematic diagram of current distribution of a first floor current generated by a first antenna unit of the foldable electronic device;

[0020] Fig.10 for Figure 5 A schematic diagram of current distribution of a third resonant current and a fourth resonant current generated by a first antenna unit of the foldable electronic device;

[0021] Fig.11 The first resonant mode generated by the first antenna unit of the foldable electronic device provided in the embodiment of the present application supports the return loss and efficiency curve of the B5 frequency band;

[0022] Fig.12 The first resonance mode generated by the first antenna unit of the foldable electronic device provided in the embodiment of the present application supports the return loss and efficiency curve of the B8 frequency band;

[0023] Fig.13 The first resonance mode generated by the first antenna unit of the foldable electronic device provided in the embodiment of the present application supports the return loss and efficiency curve of the B28 frequency band;

[0024] Fig.14 for Figure 5 The foldable electronic device shown also includes a schematic diagram of the structure of a radio frequency chip;

[0025] Fig.15 for Figure 5 The foldable electronic device shown further includes a structural schematic diagram of a second antenna unit;

[0026] Fig.16 for Figure 5 The foldable electronic device shown further includes another structural schematic diagram of a second antenna unit;

[0027] Fig.17 for Figure 5 The foldable electronic device shown further includes another structural schematic diagram of a second antenna unit;

[0028] Fig.18 for Fig.15 The foldable electronic device shown also includes a schematic diagram of the structure of a switch circuit;

[0029] Fig.19 for Figure 5 The foldable electronic device shown also includes a structural schematic diagram of a third feed source and a third tuning circuit.

[0030] Description of reference numerals:

[0031] Foldable electronic device 100; bendable body 10; reference floor 20; first antenna unit 30; first body 101, second body 102; hinge assembly 103; first frame 110; second frame 11; third frame 120; fourth frame 12; first sub-frame 112; second sub-frame 121; third sub-frame 113; fourth sub-frame 122; first antenna radiator 301; parasitic radiator 302; first feed source 303; first radiation section 310; second radiation section 311; first A ground terminal 3010; a first free terminal 3011; a first feeding point 3012; a third radiation section 320; a fourth radiation section 321; a second free terminal 3020; a second ground terminal 3021; ​​a first tuning circuit 304; a radio frequency chip 40; a second antenna unit 50; a second antenna radiator 501; a second feed source 502; a second tuning circuit 503; a third ground terminal 510; a third free terminal 511; a second feeding point 512; a switch circuit 60; a third feed source 70; and a third tuning circuit 80. DETAILED DESCRIPTION

[0032] The technical solution provided by the present application will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the embodiments described in the present application are only a part of the embodiments, not all of the embodiments. Based on the embodiments described in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present application.

[0033] References to "embodiments" and "implementations" in this application mean that the specific features, structures, or characteristics described in conjunction with the embodiments or implementations may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it mutually exclusive, independent, or alternative to other embodiments. It can be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0034] The terms "first", "second", etc. in the specification and claims of this application and the above-mentioned drawings are used to distinguish different objects rather than to describe a specific order; the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. In addition, the terms "end" and "point" in the specification and claims of this application and the above-mentioned drawings may indicate a small section of the antenna radiator relative to the antenna radiator as a whole, that is, "end" cannot be narrowly understood as an end, and "point" cannot be narrowly understood as a point.

[0035] Please refer to Figure 1 and Figure 2 The foldable electronic device 100 may be a foldable mobile phone, a foldable tablet, etc. In the embodiment of the present application, a foldable mobile phone is taken as an example. The foldable electronic device 100 includes a bendable body 10, a reference floor 20, and a first antenna unit 30. Of course, the foldable electronic device 100 may also include a display screen, a camera, a battery, etc.

[0036] The foldable body 10 includes 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 through the hinge assembly 103, and can be in a relatively folded state or an unfolded state. Specifically, when the foldable electronic device 100 is in an unfolded state, that is, the first body 101 and the second body 102 are in an unfolded state, at which time the first body 101 and the second body 102 are flattened on opposite sides of the hinge assembly 103. When the foldable electronic device 100 is in a folded state, that is, the first body 101 and the second body 102 are in a folded state, at which time the first body 101 and the second body 102 are folded in half or approximately folded together. In the process of the foldable electronic device 100 switching from the unfolded state to the folded state or from the folded state to the unfolded state, the first body 101 and the second body 102 rotate around the hinge assembly 103 respectively, and the rotation direction of the first body 101 is opposite to the rotation direction of the second body 102.

[0037] The frame of the bendable body 10 is surrounded to form an accommodation space. Specifically, the frame of the bendable body 10 includes a first frame 110, a second frame 11, a third frame 120 and a fourth frame 12 connected end to end in sequence. An accommodation space is formed between the first frame 110, the second frame 11, the third frame 120 and the fourth frame 12. Among them, the first frame 110 is located on a side of the first body 101 away from the hinge assembly 103. The third frame 120 is located on a side of the second body 102 away from the hinge assembly 103. The second frame 11 includes a first sub-frame 112 located between the first frame 110 and the hinge assembly 103 and a second sub-frame 121 located between the third frame 120 and the hinge assembly 103. The fourth frame 12 includes a third sub-frame 113 located between the first frame 110 and the hinge assembly 103 and a fourth sub-frame 122 located between the third frame 120 and the hinge assembly 103. In other words, the first frame 110, the first sub-frame 112 of the second frame 11, and the third sub-frame 113 of the fourth frame 12 form the frame of the first body 101. The third frame 120, the second sub-frame 121 of the second frame 11, and the fourth sub-frame 122 of the fourth frame 12 form the frame of the second body 102. It can be understood that the first frame 110, the first sub-frame 112 of the second frame 11, and the third sub-frame 113 of the fourth frame 12 are located on one side of the hinge assembly 103, and the third frame 120, the second sub-frame 121 of the second frame 11, and the fourth sub-frame 122 of the fourth frame 12 are located on the other side of the hinge assembly 103. The first frame 110 and the third frame 120 are non-folding frames of the foldable electronic device 100; the second frame 11 and the fourth frame 12 are foldable frames of the foldable electronic device 100.

[0038] In the present application, when the foldable electronic device 100 is in the unfolded state, the first body 101 can form the upper half of the body of the bendable body 10, and the second body 102 can form the lower half of the body of the bendable body 10; or, the first body 101 can form the lower half of the body of the bendable body 10, and the second body 102 can form the upper half of the body of the bendable body 10. In the following embodiments, it is taken as an example that when the foldable electronic device 100 is in the unfolded state, the first body 101 can form the upper half of the body of the bendable body 10, and the second body 102 can form the lower half of the body of the bendable body 10. It can be understood that when the foldable electronic device 100 is in the unfolded state, the first frame 110 can be understood as the top frame of the foldable electronic device 100; the third frame 120 can be understood as the bottom frame of the foldable electronic device 100. In other words, in the following embodiments, the first frame 110 is the top frame of the bendable body 10, and the second frame 11 is the bottom frame of the bendable body 10. Among them, the top frame of the foldable electronic device 100 can be understood as the frame of the foldable electronic device 100 that is relatively far from the ground when the user holds the foldable electronic device 100 in the unfolded state; the bottom frame of the foldable electronic device 100 can be understood as the frame of the foldable electronic device 100 that is facing the ground when the user holds the foldable electronic device 100 in the unfolded state. The second frame 11 can be the left frame of the foldable electronic device 100, and the fourth frame 12 can be the right frame of the foldable electronic device 100; or, the second frame 11 can be the right frame of the foldable electronic device 100, and the fourth frame 12 can be the left frame of the foldable electronic device 100. In the following embodiments, the second frame 11 is the left frame of the foldable electronic device 100, and the fourth frame 12 is the right frame of the foldable electronic device 100. The left side frame of the foldable electronic device 100 can be understood as the frame located on the left side relative to the user in the frame of the foldable electronic device 100 when the user holds the foldable electronic device 100 in the unfolded state; the right side frame of the foldable electronic device 100 can be understood as the frame located on the right side relative to the user in the frame of the foldable electronic device 100 when the user holds the foldable electronic device 100 in the unfolded state.

[0039] The reference floor 20 refers to a portion of the foldable electronic device 100 that is not affected by any grounding configuration and is considered to be a conductive earth. The potential of the reference floor 20 is agreed to be zero. For example, the reference floor 20 may include a grounding layer of a main circuit board, a grounding layer of a secondary circuit board, a metal part of a middle frame, and a conductive part electrically connected to one or more of the grounding layer of the main circuit board, the grounding layer of the secondary circuit board, and the metal part of the middle frame in the foldable electronic device 100. The reference floor 20 is located in the accommodation space.

[0040] like Figure 3 As shown, Figure 3 for Figure 2 The schematic diagram of the structure of the first antenna unit 30 in the foldable electronic device 100 is shown. The first antenna unit 30 includes a first antenna radiator 301, a parasitic radiator 302 and a first feed source 303.

[0041] Please refer to Figures 2 to 4 , the material of the first antenna radiator 301 can be metal, alloy, etc. The first antenna radiator 301 includes a first radiating section 310 and a second radiating section 311 connected to each other. The first radiating section 310 is arranged on the second sub-frame 121, and the second radiating section 311 is arranged on the third frame 120. It should be noted that the first antenna radiator 301 of the present application can be a frame antenna radiator or a built-in antenna radiator. For example, the first antenna radiator 301 can be one of a metal frame antenna radiator, a built-in antenna radiator of a flexible printed circuit (Flexible Printed Circuit, FPC), a built-in antenna radiator of laser direct structuring (Laser-Direct-structuring, LDS), and a built-in antenna radiator of direct printing (Printing DirectStructure, PDS). In other words, the first radiating section 310 is arranged on the second sub-frame 121, which can be understood as the first radiating section 310 is integrated on the second sub-frame 121; or, it can also be understood as the first radiating section 310 is arranged on the side of the second sub-frame 121 facing the fourth sub-frame 122. The second radiation section 311 is disposed on the third frame 120, which can be understood as the second radiation section 311 is integrated on the third frame 120; or, it can also be understood as the second radiation section 311 is disposed on the side of the third frame 120 facing the first frame 110. The first radiation section 310 is connected to the second radiation section 311 by bending. For example, the first radiation section 310 and the second radiation section 311 can be bent at a right angle, or the first radiation section 310 and the second radiation section 311 can be bent in an arc.

[0042] The end of the first radiation section 310 away from the second radiation section 311 forms a first grounding end 3010. It can be understood that the first grounding end 3010 is provided on the second sub-frame 121. In the embodiment of the present application, the "grounding end" can be understood as a grounded end, which will not be described in detail later. The first grounding end 3010 is electrically connected to the reference floor 20. Optionally, the first grounding end 3010 can be directly electrically connected to the reference floor 20, or the first grounding end 3010 can also be indirectly electrically connected to the reference floor 20 through electrical connectors such as metal shrapnel and wires. The end of the second radiation section 311 away from the first radiation section 310 forms a first free end 3011. It can be understood that the first free end 3011 is provided on the third frame 120. In the embodiment of the present application, the "free end" can be understood as an end that is not electrically connected to a conductive member or an isolation gap is provided between the conductive member, which will not be described in detail later. A first feeding point 3012 is provided between the first grounding end 3010 and the first free end 3011. In one possible embodiment, the first radiating section 310 may be provided with a first feeding point 3012. In another possible embodiment, the second radiating section 311 may be provided with a first feeding point 3012. It can be understood that the first feeding point 3012 may be provided on the second sub-frame 121, or the first feeding point 3012 may also be provided on the third frame 120. In the following embodiments, the second radiating section 311 is provided with a first feeding point 3012 as an example. The first feeding point 3012 is electrically connected to the first feed source 303. Optionally, the first feeding point 3012 may be directly electrically connected to the first feed source 303, or the first feeding point 3012 may also be indirectly electrically connected to the first feed source 303 through electrical connectors such as metal springs and feed lines.

[0043] The first feed source 303 is disposed in the accommodation space. For example, the first feed source 303 may be disposed on a circuit board of the foldable electronic device 100 and close to the first antenna radiator 301. In a possible embodiment, the first feed source 303 may be disposed close to the second radiating section 311.

[0044] The material of the parasitic radiator 302 can be metal, alloy, etc. The parasitic radiator 302 includes a third radiating segment 320 and a fourth radiating segment 321 which are connected. The third radiating segment 320 is arranged on the third frame 120, and the fourth radiating segment 321 is arranged on the fourth sub-frame 122. It should be noted that the parasitic radiator 302 of the present application can be a frame antenna radiator or a built-in antenna radiator. For example, the parasitic radiator 302 can be one of a metal frame parasitic radiator, an FPC built-in parasitic radiator, an LDS built-in parasitic radiator, a PDS built-in parasitic radiator, etc. In other words, the third radiating segment 320 is arranged on the third frame 120, which can be understood as the third radiating segment 320 is integrated on the third frame 120; or, it can also be understood as the third radiating segment 320 is arranged on the side of the third frame 120 facing the first frame 110. The fourth radiation section 321 is arranged on the fourth sub-frame 122, which can be understood as the fourth radiation section 321 is integrated on the fourth sub-frame 122; or, it can also be understood as the fourth radiation section 321 is arranged on the side of the fourth sub-frame 122 facing the second sub-frame 121. The third radiation section 320 is connected to the fourth radiation section 321 by bending. For example, the third radiation section 320 and the fourth radiation section 321 can be bent at a right angle, or the third radiation section 320 and the fourth radiation section 321 can be bent in an arc.

[0045] The end of the third radiation section 320 away from the fourth radiation section 321 forms a second free end 3020. It is understandable that the second free end 3020 is provided on the third frame 120. A coupling gap is formed between the second free end 3020 and the first free end 3011. The size of the coupling gap can be 0.5mm to 2mm. It is understandable that the end of the second radiation section 311 away from the first radiation section 310 and the end of the third radiation section 320 away from the fourth radiation section 321 are coupled in an electric field, magnetic field, or electromagnetic field. The end of the fourth radiation section 321 away from the third radiation section 320 forms a second grounding end 3021. It is understandable that the second grounding end 3021 is provided on the fourth sub-frame 122. The second grounding end 3021 is electrically connected to the reference floor 20. Optionally, the second grounding end 3021 can be directly electrically connected to the reference floor 20, or the second grounding end 3021 can also be indirectly electrically connected to the reference floor 20 through electrical connectors such as metal shrapnel and wires.

[0046] When the first antenna radiator 301 generates a resonant current under the excitation of the first feed source 303, the resonant current of the first antenna radiator 301 can be coupled to the third radiating section 320 of the parasitic radiator 302 via the second radiating section 311 of the first antenna radiator 301, thereby generating a resonant current in the parasitic radiator 302. The resonant current of the first antenna radiator 301 can be returned to the ground via the first ground terminal 3010. The resonant current of the parasitic radiator 302 can be returned to the ground via the second ground terminal 3021.

[0047] The first feed source 303 is used to excite the first antenna radiator 301 and the parasitic radiator 302 to generate a first resonant mode and a second resonant mode supporting a low frequency band. The first resonant mode is an EE radiation mode between the first antenna radiator 301 and the parasitic radiator 302. The second resonant mode is an EE balanced mode between the first antenna radiator 301 and the parasitic radiator 302.

[0048] The foldable electronic device 100 provided in the present application includes a bendable body 10, a reference floor 20 and a first antenna unit 30, the first antenna unit 30 includes a first antenna radiator 301, a parasitic radiator 302 and a first feed source 303, the first radiation section 310 of the first antenna radiator 301 is arranged on the second sub-frame 121 of the bendable body 10, the second radiation section 311 of the first antenna radiator 301 is arranged on the third frame 120 of the bendable body 10, the third radiation section 320 of the parasitic radiator 302 is arranged on the third frame 120 of the bendable body 10, and the fourth radiation section 321 of the parasitic radiator 302 is arranged on the fourth sub-frame 122 of the bendable body 10, that is, the first antenna radiator 301 is arranged on the frame of the second body 102 away from the hinge assembly 103 and the side frame of the second body 102 on one side, and the parasitic radiator 302 is arranged on the frame of the second body 102 away from the hinge assembly 103 and the side frame of the other side of the second body 102. The end of the second radiation section 311 away from the first radiation section 310 forms a first free end 3011, and the end of the third radiation section 320 away from the fourth radiation section 321 forms a second free end 3020. A coupling gap is formed between the second free end 3020 and the first free end 3011. Therefore, under the excitation of the first feed source 303, the resonant current of the first resonant mode and the resonant current of the second resonant mode generated by the first antenna unit 30 are mostly distributed in the first antenna radiator 301 and the parasitic radiator 302, which is beneficial to concentrate the radiation energy of the first antenna unit 30 on the second body 102. In addition, the end of the first radiation section 310 away from the second radiation section 311 forms a first grounding end 3010, and the end of the fourth radiation section 321 away from the third radiation section 320 forms a second grounding end 3021. The first grounding end 3010 and the second grounding end 3021 are electrically connected to the reference floor 20 located in the accommodation space of the bendable body 10. Therefore, under the excitation of the first antenna radiator 301 and the parasitic radiator 302, the current of the reference floor 20 is mainly distributed between the first grounding end 3010 and the second grounding end 3021 and is roughly distributed along the connection direction of the first grounding end 3010 and the second grounding end 3021, further concentrating the radiation energy of the first antenna unit 30 on the second body 102. In addition, the influence of the bending state of the first body 101 and the second body 102 on the radiation performance of the first antenna unit 30 is reduced, and the communication performance of the foldable electronic device 100 in the folded state can be improved.

[0049] Among them, the low frequency band is the LB band, and the low frequency band is a band less than 1 GHz. The low frequency band includes the B5 band (0.82 GHz to 0.89 GHz), the B8 band (0.88 GHz to 0.96 GHz), the B20 band (0.79 GHz to 0.86 GHz), the B28 band (0.7 GHz to 0.8 GHz), etc. The first resonance mode can support one of the B5 band, the B8 band, the B20 band, and the B28 band. The second resonance mode can support one of the B5 band, the B8 band, the B20 band, and the B28 band. In this embodiment, when the first antenna radiator 301 generates a 1 / 4 wavelength mode, the length of the first antenna radiator 301 can be 35 mm to 65 mm. When the parasitic radiator 302 generates a 1 / 4 wavelength mode, the length of the parasitic radiator 302 can be 35 mm to 65 mm.

[0050] like Figure 5 As shown, the first antenna unit 30 also includes a first tuning circuit 304 electrically connected between the first feeding point 3012 and the first feed source 303. The first tuning circuit 304 and the first feeding point 3012 can be directly electrically connected or indirectly electrically connected. The first tuning circuit 304 and the first feed source 303 can be directly electrically connected or indirectly electrically connected. The first tuning circuit 304 may include capacitors and / or inductors, etc. The present application does not specifically limit the number of capacitors and inductors included in the first tuning circuit 304. When the first tuning circuit 304 includes multiple capacitors, the multiple capacitors can be connected in series or in parallel. When the first tuning circuit 304 includes multiple inductors, the multiple inductors can be connected in series or in parallel. When the first tuning circuit 304 includes one or more capacitors and one or more inductors, the inductors and capacitors can be connected in series or in parallel.

[0051] For example: the first tuning circuit 304 may include a capacitor and an inductor connected in series; or, the first tuning circuit 304 may include a capacitor and an inductor connected in parallel; or, the first tuning circuit 304 may include an inductor, a first capacitor and a second capacitor, the inductor is connected in parallel with the first capacitor and then in series with the second capacitor; or, the first tuning circuit 304 may include a first inductor, a second inductor and a capacitor, the first inductor is connected in parallel with the capacitor and then in series with the second inductor. The first tuning circuit 304 may include an inductor, a first capacitor and a second capacitor, the inductor is connected in series with the first capacitor and then in parallel with the second capacitor; or, the first tuning circuit 304 may include a first inductor, a second inductor and a capacitor, the first inductor is connected in series with the capacitor and then in parallel with the second inductor. The first tuning circuit 304 may also include a first sub-tuning circuit formed by a first inductor and a first capacitor connected in parallel, and a second sub-tuning circuit formed by a second inductor and a second capacitor connected in parallel, and the first sub-tuning circuit and the second sub-tuning circuit are connected in series; or, the first tuning circuit 304 may also include a third sub-tuning circuit formed by a first inductor and a first capacitor connected in series, and a fourth sub-tuning circuit formed by a second inductor and a second capacitor connected in series, and the third sub-tuning circuit and the fourth sub-tuning circuit are connected in parallel.

[0052] The first tuning circuit 304 is used to tune the operating frequency band of the first antenna unit 30. In one possible implementation, the operating frequency band of the first antenna unit 30 may be one of the B5 frequency band, the B8 frequency band, and the B28 frequency band. In another possible implementation, the operating frequency band of the first antenna unit 30 may be switched among the B5 frequency band, the B8 frequency band, and the B28 frequency band. In this implementation, the first tuning circuit 304 further includes a switch, and the switch switching realizes the switching of the operating frequency band of the first antenna unit 30.

[0053] In the related art, the width of a foldable mobile phone is about 70 mm. Therefore, the embodiment of the present application enables the first antenna unit 30 to support the low frequency band under the excitation of the first feed source 303, which is conducive to realizing the structural design of the first antenna radiator 301 and the parasitic radiator 302, that is, it is conducive to setting the first grounding end 3010 of the first antenna radiator 301 on the second sub-frame 121, the first free end 3011 on the third frame 120, the second free end 3020 of the parasitic radiator 302 on the third frame 120, and the second grounding end 3021 on the fourth sub-frame 122, while facilitating the design of the length of the first antenna radiator 301 and the length of the parasitic radiator 302. In addition, when the length of the first antenna radiator 301 and the length of the parasitic radiator 302 are easy to design, the design difficulty of the first tuning circuit 304 can also be reduced, for example, the number of capacitors and / or inductors in the first tuning circuit 304 can be reduced.

[0054] In a possible embodiment, the length of the first radiation section 310 is less than or equal to 1 / 16 wavelength of the working frequency band of the first antenna unit 30. The length of the fourth radiation section 321 is less than or equal to 1 / 16 wavelength of the working frequency band of the first antenna unit 30. Specifically, the length of the first radiation section 310 may be less than or equal to 20 mm. The length of the fourth radiation section 321 may be less than or equal to 20 mm. The length of the first radiation section 310 is the dimension of the first antenna radiator 301 along the length direction of the foldable electronic device 100. The length of the fourth radiation section 321 is the dimension of the parasitic radiator 302 along the length direction of the foldable electronic device 100. The length direction of the foldable electronic device 100 may refer to the Y-axis direction of the accompanying drawings. The width direction of the foldable electronic device 100 may refer to the X-axis direction of the accompanying drawings.

[0055] In the related art, the length of a foldable mobile phone is about 160 mm. Therefore, in the embodiment of the present application, by enabling the first antenna unit 30 to support a low frequency band under the excitation of the first feed source 303, the length of the first radiation segment 310 of the first antenna unit 30 is less than or equal to 1 / 16 wavelength of the working frequency band of the first antenna unit 30, and the length of the fourth radiation segment 321 of the first antenna unit 30 is less than or equal to 1 / 16 wavelength of the working frequency band of the first antenna unit 30. The radiation energy of the first antenna unit 30 can be concentrated on the lower half of the second body 102 of the foldable electronic device 100, that is, the radiation energy of the first antenna radiator 301, the radiation energy of the parasitic radiator 302, and the radiation energy of the reference floor 20 are concentrated on a partial area of ​​the second body 102 away from the hinge assembly 103, thereby reducing the influence of the bending state of the first body 101 and the second body 102 on the radiation performance of the first antenna unit 30, and improving the communication performance of the foldable electronic device 100 when it is in a folded state.

[0056] Among them, the distance between the first grounding terminal 3010 and the third frame 120 is the first distance. The distance between the second grounding terminal 3021 and the third frame 120 is the second distance. In a possible implementation, the first distance between the first grounding terminal 3010 and the third frame 120 can be understood as the length of the first radiation segment 310. The second distance between the second grounding terminal 3021 and the third frame 120 can be understood as the length of the fourth radiation segment 321. The absolute value of the difference between the first distance and the second distance is less than or equal to 1 / 16 wavelength of the working frequency band of the first antenna unit 30. Specifically, the absolute value of the difference between the first distance and the second distance can be less than or equal to 20 mm.

[0057] In a possible implementation, Figure 5As shown, the first distance may be equal to the second distance. For example: the first distance may be 10mm to 15mm, the second distance may be 10mm to 15mm, and the first distance is equal to the second distance; or, the first distance may be less than 5mm to 10mm, the second distance may be 5mm to 10mm, and the first distance is equal to the second distance. It can be understood that the length of the first radiation section 310 may be equal to the length of the fourth radiation section 321. Among them, the length of the first radiation section 310 is the size of the first radiation section 310 along the Y-axis direction. The length of the fourth radiation section 321 is the size of the fourth radiation section 321 along the Y-axis direction. In this embodiment, the length of the second radiation section 311 may be slightly greater than the length of the third radiation section 320. The length of the second radiation section 311 is the size of the second radiation section 311 along the X-axis direction. The length of the third radiation section 320 is the size of the third radiation section 320 along the X-axis direction.

[0058] In this embodiment, under the excitation of the first antenna radiator 301 and the parasitic radiator 302, the current of the reference floor 20 is mainly distributed between the first ground terminal 3010 and the second ground terminal 3021 and distributed along the connection direction of the first ground terminal 3010 and the second ground terminal 3021, that is, the current of the reference floor 20 is distributed along the width direction of the foldable electronic device 100, which can also be understood as the reference floor 20 generating a transverse distributed current. In this way, the longitudinal current component of the reference floor 20 is minimal, which can minimize the influence of the bending state of the first body 101 and the second body 102 on the radiation performance of the first antenna unit 30, thereby optimizing the communication performance of the foldable electronic device 100 in the folded state.

[0059] In another possible implementation, Figure 6 As shown, the first distance can be greater than the second distance. For example: the first distance can be 15mm to 20mm; the second distance can be 10mm to 15mm, and the absolute value of the difference between the first distance and the second distance can be less than or equal to 20mm; or, the first distance can be 5mm to 10mm; the second distance can be less than 5mm, and the absolute value of the difference between the first distance and the second distance can be less than or equal to 20mm. It can be understood that the length of the first radiation segment 310 can be greater than the length of the fourth radiation segment 321. In this embodiment, the length of the second radiation segment 311 can be less than or equal to the length of the third radiation segment 320.

[0060] In this embodiment, by making the first distance greater than the second distance, the second ground terminal 3021 can be closer to the third frame 120. Since the second ground terminal 3021 is located at the fourth sub-frame 122 of the fourth frame 12, and the fourth frame 12 is the right frame of the foldable electronic device 100, the radiation performance of the parasitic radiator 302 in the left-hand holding scene and the left-head-hand scene can be guaranteed. In addition, by making the first distance greater than the second distance, the second ground terminal 3021 can be closer to the third frame 120. At this time, the second ground terminal 3021 is closer to the corner point of the right bottom of the reference floor 20, so that the maximum distribution angle of the current excited by the parasitic radiator 302 on the reference floor 20 is close to 90°, so that the current excited by the parasitic radiator 302 on the reference floor 20 has almost no currents in opposite directions that cancel each other, thereby improving the radiation efficiency of the parasitic radiator 302.

[0061] In a third possible implementation, Figure 7 As shown, the first distance can be smaller than the second distance. For example: the first distance can be 10mm-15mm, the second distance can be 15mm-20mm, and the absolute value of the difference between the first distance and the second distance can be less than or equal to 20mm; or, the first distance can be less than 5mm, the second distance can be 5mm-10mm, and the absolute value of the difference between the first distance and the second distance can be less than or equal to 20mm. It can be understood that the length of the first radiation segment 310 can be smaller than the length of the fourth radiation segment 321. In this embodiment, the length of the second radiation segment 311 can be greater than or equal to the length of the third radiation segment 320.

[0062] In this embodiment, by making the first distance smaller than the second distance, the first grounding terminal 3010 can be closer to the third frame 120. Since the first grounding terminal 3010 is located in the second sub-frame 121 of the second frame 11, and the second frame 11 is the left frame of the foldable electronic device 100, the radiation performance of the first antenna radiator 301 in the right-hand holding scenario and the right-head-hand scenario can be guaranteed. In addition, by making the first distance smaller than the second distance, the first grounding terminal 3010 can be closer to the third frame 120. At this time, the first grounding terminal 3010 is closer to the corner point of the left bottom of the reference floor 20, so that the maximum distribution angle of the current excited by the first antenna radiator 301 on the reference floor 20 is close to 90°, so that the current excited by the first antenna radiator 301 on the reference floor 20 has almost no currents in opposite directions that cancel each other, thereby improving the radiation efficiency of the first antenna radiator 301.

[0063] In a possible embodiment, the first antenna unit 30 generates a first resonance mode of 1 / 4 wavelength and a second resonance mode of 1 / 4 wavelength under the excitation of the first feed source 303. The length of the first antenna radiator 301 can be approximately 1 / 4 wavelength of the working frequency band of the first antenna unit 30. The length of the parasitic radiator 302 can be approximately 1 / 4 wavelength of the working frequency band of the first antenna unit 30.

[0064] like Figure 8 As shown, the first resonance mode includes a 1 / 4 wavelength resonance mode with a first resonance current generated by the first antenna radiator 301 and a 1 / 4 wavelength resonance mode with a second resonance current generated by the parasitic radiator 302. Specifically, the first antenna radiator 301 between the first ground terminal 3010 and the first free end 3011 generates the first resonance current, and the parasitic radiator 302 between the second free end 3020 and the second ground terminal 3021 generates the second resonance current. The flow direction of the first resonance current is the same as the flow direction of the second resonance current. Figure 8 The dashed line in the middle shows the first resonant current and the second resonant current of the first resonant mode. Figure 8 The second resonant current can be found in the attached Figure 8 As shown in I2. The intensity of the first resonant current I1 is stronger than the intensity of the second resonant current I2. When the first antenna unit 30 generates the first resonant mode, the center frequency of the working frequency band of the first antenna unit 30 is slightly greater than the resonant frequency of the resonant mode of the first antenna radiator 301.

[0065] Among them, Fig. 9 As shown, the first resonance mode excites the reference floor 20 to generate a first floor current. The first floor current generated by the reference floor 20 is mainly distributed along the extension direction of the third frame 120. Fig. 9 The first floor current of the first resonance mode is illustrated. The first floor current is mainly distributed along the extension direction of the third frame 120. In other words, the first floor current is mainly distributed along the width direction of the foldable electronic device 100. It can be understood that the intensity of the current component distributed along the width direction of the foldable electronic device 100 in the first floor current is much stronger than the intensity of the current component distributed along the length direction of the foldable electronic device 100.

[0066] like Fig.10As shown, the second resonance mode includes a 1 / 4 wavelength resonance mode with a third resonance current generated by the first antenna radiator 301 and a 1 / 4 wavelength resonance mode with a fourth resonance current generated by the parasitic radiator 302. Specifically, the first antenna radiator 301 between the first ground terminal 3010 and the first free end 3011 generates the third resonance current, and the parasitic radiator 302 between the second free end 3020 and the second ground terminal 3021 generates the fourth resonance current. The flow direction of the third resonance current is opposite to the flow direction of the fourth resonance current. Fig.10 The dashed line in the middle shows the third resonant current and the fourth resonant current of the second resonant mode. Fig.10 As shown in I3, the fourth resonant current can refer to the attached Fig.10 The third resonant current I3 has a strength weaker than the fourth resonant current I4. When the first antenna unit 30 generates the second resonant mode, the center frequency of the working frequency band of the first antenna unit 30 is slightly lower than the resonant frequency of the resonant mode of the parasitic radiator 302.

[0067] The second resonant mode excites the reference floor 20 to generate a second floor current. The second floor current generated by the reference floor 20 is mainly distributed along the extension direction of the third frame 120. In other words, the second floor current is mainly distributed along the width direction of the foldable electronic device 100. It can be understood that the intensity of the current component distributed along the width direction of the foldable electronic device 100 in the second floor current is much stronger than the intensity of the current component distributed along the length direction of the foldable electronic device 100. The distribution mode of the second floor current can be referred to in the attached Fig. 9 The distribution of the first floor current is shown.

[0068] In a possible implementation, the first resonant mode and the second resonant mode support different low-frequency bands, respectively. For example: when the first antenna unit 30 generates the first resonant mode, it can support one of the B5 band, the B8 band, and the B28 band; when the first antenna unit 30 generates the second resonant mode, it can support another of the B5 band, the B8 band, and the B28 band. In this implementation, the first antenna unit 30 can support two low-frequency bands, which can avoid or reduce the switching of the working frequency band of the first antenna unit 30, and can simplify the design of the first tuning circuit 304.

[0069] Optionally, a frequency band supported by the first resonance mode and a frequency band supported by the second resonance mode at least partially overlap, or a frequency band supported by the first resonance mode and a frequency band supported by the second resonance mode are continuous.

[0070] In a possible implementation, the frequency band supported by the first resonance mode at least partially overlaps with the frequency band supported by the second resonance mode. Optionally, the maximum frequency point of the frequency band supported by the second resonance mode may be greater than the maximum frequency point of the frequency band supported by the first resonance mode; or, the center frequency point of the frequency band supported by the second resonance mode may be greater than the center frequency point of the frequency band supported by the first resonance mode. For example: the minimum frequency of the frequency band supported by the second resonance mode may be located between the minimum frequency of the frequency band supported by the first resonance mode and the center frequency of the frequency band supported by the first resonance mode, and the maximum frequency of the frequency band supported by the second resonance mode may be greater than the maximum frequency of the frequency band supported by the first resonance mode; or, the minimum frequency of the frequency band supported by the second resonance mode may be located between the center frequency of the frequency band supported by the first resonance mode and the maximum frequency of the frequency band supported by the first resonance mode, and the maximum frequency of the frequency band supported by the second resonance mode may be greater than the maximum frequency of the frequency band supported by the first resonance mode; or, the minimum frequency of the frequency band supported by the second resonance mode may be located between the minimum frequency of the frequency band supported by the first resonance mode and the center frequency of the frequency band supported by the first resonance mode, and the maximum frequency of the frequency band supported by the second resonance mode may be located between the center frequency of the frequency band supported by the first resonance mode and the maximum frequency of the frequency band supported by the first resonance mode.

[0071] In another possible implementation, the frequency band supported by the first resonance mode is continuous with the frequency band supported by the second resonance mode. For example, the minimum frequency point of the frequency band supported by the second resonance mode may be equal to the maximum frequency point of the frequency band supported by the first resonance mode.

[0072] By making the frequency band supported by the first resonance mode at least partially overlap with the frequency band supported by the second resonance mode, or making the frequency band supported by the first resonance mode continuous with the frequency band supported by the second resonance mode, the radiation efficiency of the first antenna unit 30 in the working frequency band can be improved and broadband performance can be achieved.

[0073] Please refer to Figures 11 to 13 , Fig.11 The first resonance mode generated by the first antenna unit 30 of the foldable electronic device 100 provided in the embodiment of the present application supports the return loss (S11 curve) and efficiency curve of the B5 frequency band; Fig.12 The first resonance mode generated by the first antenna unit 30 of the foldable electronic device 100 provided in the embodiment of the present application supports the return loss and efficiency curve of the B8 frequency band; Fig.13 The first resonant mode generated by the first antenna unit 30 of the foldable electronic device 100 provided in the embodiment of the present application supports the return loss and efficiency curve of the B28 frequency band. Fig.11 Curve a in the figure is the S11 curve of the first antenna unit 30; curve b is the total efficiency curve of the first antenna unit 30 in the free space scenario. Fig.11It can be seen from the curve a that the S11 curve includes two concave points, that is, the first antenna unit 30 can generate a first resonance mode and a second resonance mode supporting the B5 frequency band under the excitation of the first feed source 303, and the frequency band supported by the second resonance mode and the B5 frequency band can partially overlap. Fig.11 It can be seen from curve b that the total efficiency of the first antenna unit 30 in generating the first resonance mode is greater than -10 dB; the total efficiency of the first antenna unit 30 in generating the second resonance mode is close to -10 dB. Fig.12 Curve c is the S11 curve of the first antenna unit 30; curve d is the total efficiency curve of the first antenna unit 30 in the free space scenario. Fig.12 It can be seen from the curve c that the S11 curve includes two concave points, that is, the first antenna unit 30 can generate a first resonance mode and a second resonance mode supporting the B8 frequency band under the excitation of the first feed source 303, and the frequency band supported by the second resonance mode and the B8 frequency band can partially overlap. Fig.12 It can be seen from curve d that the total efficiency of the first antenna unit 30 in generating the first resonance mode is greater than -10 dB; the total efficiency of the first antenna unit 30 in generating the second resonance mode is close to -10 dB. Fig.13 Curve e in the figure is the S11 curve of the first antenna unit 30; curve f is the total efficiency curve of the first antenna unit 30 in the free space scenario. Fig.13 It can be seen from curve e that the S11 curve includes two concave points, that is, the first antenna unit 30 can generate a first resonant mode and a second resonant mode supporting the B28 frequency band under the excitation of the first feed source 303, and the frequency band supported by the second resonant mode is different from the B28 frequency band. Fig.13 It can be seen from curve f that the total efficiency of the first antenna unit 30 in generating the first resonance mode is greater than -13 dB; the total efficiency of the first antenna unit 30 in generating the second resonance mode is close to -15 dB.

[0074] Furthermore, if Fig.14 As shown, the foldable electronic device 100 also includes a radio frequency chip 40. The radio frequency chip 40 is disposed in the first body 101 and is electrically connected to the first feed source 303. The radio frequency chip 40 provides a radio frequency signal to the first feed source 303. In a possible embodiment, the foldable electronic device 100 may also include a first circuit board disposed in the first body 101 and a second circuit board disposed in the second body 102. The radio frequency chip 40 may be disposed in the first circuit board. The first feed source 303 may be disposed in the second circuit board. The radio frequency chip 40 and the first feed source 303 may be electrically connected through electrical connectors such as wires and circuit boards. Among them, the ground layer of the first circuit board and the ground layer of the second circuit board may form a part of the reference floor 20. It can be understood that in this embodiment, the radio frequency chip 40 is located in the upper half of the foldable electronic device 100, and the first feed source 303 is located in the lower half of the foldable electronic device 100.

[0075] By arranging the RF chip 40 in the first body 101 and the first antenna unit 30 in the second body 102, it is convenient to design one or more medium and high frequency antenna units in the first body 101 of the foldable electronic device 100. In this case, the threading loss between the medium and high frequency antenna unit and the RF chip 40 due to the board-level difference is small, which can improve the balance of the communication performance of the medium and high frequency antenna unit.

[0076] Among them, when the first body 101 and the second body 102 are in the unfolded state, the radiation efficiency of the foldable electronic device 100 in the free space scene is the first radiation efficiency, and when the first body 101 and the second body 102 are in the folded state, the radiation efficiency of the foldable electronic device 100 in the free space scene is the second radiation efficiency, the first radiation efficiency is greater than the second radiation efficiency, and the difference between the first radiation efficiency and the second radiation efficiency is less than or equal to 4dB. The second radiation efficiency is greater than or equal to 10dB. Table 1 is the measured data of the first radiation efficiency and the second radiation efficiency of the foldable electronic device 100 in the free space scene when the first antenna unit 30 provided in the embodiment of the present application is working. Table 2 is the conversion data of the radiation efficiency of the first antenna unit 30 of the foldable electronic device 100 in the free space scene. The first radiation efficiency and the second radiation efficiency of the foldable electronic device 100 in the free space scene when the first antenna unit 30 is working refer to the air performance (Over-the-Air Performance, OTA) of the foldable electronic device 100 in the free space scene when the first antenna unit 30 is working. When the first antenna unit 30 of the foldable electronic device 100 is working, its first radiation efficiency and second radiation efficiency in the free space scenario are the sum of the radiation efficiency at the RF board level and the radiation efficiency of the first antenna unit 30 in the free space scenario. Among them, the radiation efficiency at the RF board level is about 24dB. It can be understood that when the first body 101 and the second body 102 are in an unfolded state, the radiation efficiency of the first antenna unit 30 in the free space scenario is about the third radiation efficiency in Table 2; when the first body 101 and the second body 102 are in a folded state, the radiation efficiency of the first antenna unit 30 in the free space scenario is about the fourth radiation efficiency in Table 2.

[0077] Table 1:

[0078]

[0079] Table 2:

[0080]

[0081]

[0082] For further information, please refer to Fig.15 and Fig.16, the foldable electronic device 100 also includes a second antenna unit 50. The second antenna unit 50 includes a second antenna radiator 501, a second feed source 502 and a second tuning circuit 503. The material of the second antenna radiator 501 can be metal, alloy, etc. The second antenna radiator 501 is arranged on the second frame 11 or the fourth frame 12. In the embodiment of the present application, the second antenna radiator 501 is arranged on the fourth frame 12 as an example. It should be noted that the second antenna radiator 501 of the present application can be a frame antenna radiator or a built-in antenna radiator. For example, the second antenna radiator 501 can be one of a metal frame antenna radiator, an FPC built-in antenna radiator, an LDS built-in antenna radiator, a PDS built-in antenna radiator, etc. In other words, the second antenna radiator 501 is arranged on the fourth frame 12, which can be understood as the second antenna radiator 501 is integrated on the fourth frame 12; or, it can also be understood as the second antenna radiator 501 is arranged on the side of the fourth frame 12 facing the second frame 11.

[0083] Please refer to Fig.15 and Fig.17, one end of the second antenna radiator 501 forms a third grounding terminal 510. It can be understood that the third grounding terminal 510 is provided on the fourth frame 12. The third grounding terminal 510 is electrically connected to the reference floor 20. Optionally, the third grounding terminal 510 can be directly electrically connected to the reference floor 20, or the third grounding terminal 510 can also be indirectly electrically connected to the reference floor 20 through an electrical connector such as a metal spring, a wire, etc. The other end of the second antenna radiator 501 forms a third free end 511. It can be understood that the third free end 511 is provided on the fourth frame 12. Among them, when the foldable electronic device 100 is in the unfolded state, the first frame 110, the third grounding terminal 510, the third free end 511 and the third frame 120 can be arranged in sequence along the length direction of the foldable electronic device 100; or, when the foldable electronic device 100 is in the unfolded state, the first frame 110, the third free end 511, the third grounding terminal 510 and the third frame 120 can be arranged in sequence along the length direction of the foldable electronic device 100. A second feeding point 512 is provided between the third ground terminal 510 and the third free end 511. The second feeding point 512 may be relatively close to the third ground terminal 510; or, the second feeding point 512 may be relatively close to the third free end 511; or, the second feeding point 512 may be located at the midpoint of the second antenna radiator 501. The second feeding point 512 is electrically connected to the second feed source 502 through the second tuning circuit 503. In other words, the second tuning circuit 503 is electrically connected between the second feeding point 512 and the second feed source 502. Optionally, the second feeding point 512 may be directly electrically connected to the second tuning circuit 503, or, the second feeding point 512 may also be indirectly electrically connected to the second tuning circuit 503 through electrical connectors such as metal shrapnel and feeder lines; the second feed source 502 may be directly electrically connected to the second tuning circuit 503, or, the second feed source 502 may be indirectly electrically connected to the second tuning circuit 503 through electrical connectors such as metal shrapnel and feeder lines. The second feed source 502 is disposed in the accommodation space. For example, the second feed source 502 can be disposed on a circuit board of the foldable electronic device 100 and close to the second antenna radiator 501. In the embodiment of the present application, the second antenna radiator 501 can be understood as an inverted F-type antenna radiator.

[0084] The second antenna unit 50 supports the low frequency band under the excitation of the second feed source 502. For example, the second antenna unit 50 can support at least one of the B5 band, the B8 band, and the B28 band under the excitation of the second feed source 502. In the present application, the length of the second antenna radiator 501 can be 35 mm to 65 mm.

[0085] Wherein, the second tuning circuit 503 may include capacitors and / or inductors, etc. The present application does not specifically limit the number of capacitors and the number of inductors included in the first tuning circuit 304. When the second tuning circuit 503 includes multiple capacitors, the multiple capacitors may be connected in series or in parallel. When the second tuning circuit 503 includes multiple inductors, the multiple inductors may be connected in series or in parallel. When the second tuning circuit 503 includes one or more capacitors and one or more inductors, the inductors and capacitors may be connected in series or in parallel.

[0086] The second tuning circuit 503 is used to tune the working frequency band of the second antenna unit 50. In one possible implementation, the working frequency band of the second antenna unit 50 may be one of the B5 frequency band, the B8 frequency band, and the B28 frequency band. In another possible implementation, the working frequency band of the second antenna unit 50 may be switched among the B5 frequency band, the B8 frequency band, and the B28 frequency band. In this implementation, the second tuning circuit 503 further includes a switch, and the switch switching realizes the switching of the working frequency band of the second antenna unit 50.

[0087] Since the third ground terminal 510 of the second antenna unit 50 is located at the fourth frame 12, that is, at the foldable frame of the foldable electronic device 100, the current of the reference floor 20 under the excitation of the second antenna radiator 501 is mainly distributed along the extension direction of the fourth frame 12, that is, longitudinally distributed, so that the foldable electronic device 100 has better communication performance when it is in the unfolded state. Table 3 is the measured data of the radiation efficiency of the second antenna unit 50 of the foldable electronic device 100 in the free space scene when it is working. Among them, when the second antenna unit 50 is working and the first body 101 and the second body 102 are in the unfolded state, the radiation efficiency of the foldable electronic device 100 in the free space scene is the fifth radiation efficiency; when the second antenna unit 50 is working and the first body 101 and the second body 102 are in the folded state, the radiation efficiency of the foldable electronic device 100 in the free space scene is the sixth radiation efficiency.

[0088] Table 3:

[0089]

[0090] By comparing Table 1 and Table 2, it can be seen that when the first body 101 and the second body 102 are in the unfolded state, the radiation efficiency of the foldable electronic device 100 when the first antenna unit 30 is working is weaker than the radiation efficiency of the foldable electronic device 100 when the second antenna unit 50 is working; and when the first body 101 and the second body 102 are in the folded state, the radiation efficiency of the foldable electronic device 100 when the first antenna unit 30 is working is stronger than the radiation efficiency of the foldable electronic device 100 when the second antenna unit 50 is working.

[0091] In a possible embodiment, when the first body 101 and the second body 102 are in a folded state, the first antenna unit 30 is in a working state, and when the first body 101 and the second body 102 are in an unfolded state, the second antenna unit 50 is in a working state.

[0092] In a possible implementation, Fig.18 As shown, the foldable electronic device 100 may further include a switch circuit 60. One end of the switch circuit 60 is electrically connected to the RF chip 40, and the other end of the switch circuit 60 is electrically connected to the first feed source 303 and the second feed source 502. The switch circuit 60 switches the electrical connection state with the first feed source 303 and the second feed source 502 according to the unfolded or folded state of the foldable electronic device 100. When the other end of the switch circuit 60 is connected to the first feed source 303, the first antenna unit 30 may be in an operating state. When the other end of the switch circuit 60 is connected to the second feed source 502, the second antenna unit 50 may be in an operating state.

[0093] By making the first antenna unit 30 in working state when the first body 101 and the second body 102 are in a folded state, and the second antenna unit 50 in working state when the first body 101 and the second body 102 are in an unfolded state, the foldable electronic device 100 has better communication performance in both the unfolded state and the folded state.

[0094] Furthermore, if Fig.19As shown, the foldable electronic device 100 also includes a third feed source 70 and a third tuning circuit 80. The third feed source 70 is arranged in the accommodating space. For example: the third feed source 70 can be arranged on the circuit board of the foldable electronic device 100 and close to the parasitic radiator 302. A third feeding point 3022 is arranged between the second free end 3020 and the second grounding end 3021. In one possible embodiment, the third radiating section 320 can be provided with a third feeding point 3022. In another possible embodiment, the fourth radiating section 321 can be provided with a third feeding point 3022. It can be understood that the third feeding point 3022 can be arranged on the third frame 120, or the third feeding point 3022 can also be arranged on the fourth sub-frame 122. In the following embodiments, the third radiating section 320 is provided with a third feeding point 3022 as an example. The third feeding point 3022 is electrically connected to the third feed source 70 through the third tuning circuit 80. In other words, the third tuning circuit 80 is electrically connected to the third feeding point 3022 and the third feed source 70. Optionally, the third feeding point 3022 can be directly electrically connected to the third tuning circuit 80, or the third feeding point 3022 can also be indirectly electrically connected to the third tuning circuit 80 through electrical connectors such as metal shrapnel and feeder lines; the third feed source 70 can be directly electrically connected to the third tuning circuit 80, or the third feed source 70 can be indirectly electrically connected to the third tuning circuit 80 through electrical connectors such as metal shrapnel and feeder lines. The first antenna unit 30 can also support medium and high frequency bands under the excitation of the third feed source 70. The medium and high frequency band is the MHB band, which is a frequency band of 1 GHz to 3 GHz. For example, the first antenna unit 30 can support at least one of the B3 frequency band (1.71 GHz to 1.88 GHz), the B40 frequency band (2.3 GHz to 2.4 GHz), the B41 frequency band (2.49 GHz to 2.69 GHz), etc. under the excitation of the third feed source 70.

[0095] Among them, the third tuning circuit 80 may include capacitors and / or inductors, etc. The present application does not specifically limit the number of capacitors and the number of inductors included in the third tuning circuit 80. When the third tuning circuit 80 includes multiple capacitors, the multiple capacitors can be connected in series or in parallel. When the third tuning circuit 80 includes multiple inductors, the multiple inductors can be connected in series or in parallel. When the third tuning circuit 80 includes one or more capacitors and one or more inductors, the inductors and capacitors can be connected in series or in parallel.

[0096] In a possible embodiment, the first antenna unit 30 generates a third resonance mode of 1 / 4 wavelength and / or a fourth resonance mode of 1 / 4 wavelength under the excitation of the third feed source 70. The third resonance mode includes a fifth resonance current generated by the parasitic radiator 302 between the third feeding point 3022 and the second free end 3020. The fourth resonance mode includes a sixth resonance current generated by the parasitic radiator 302 between the third feeding point 3022 and the second free end 3020, and a seventh resonance current generated by the first antenna radiator 301 between the first free end 3011 and the first feeding point 3012.

[0097] By making the foldable electronic device 100 also include a third feed source 70, a third feeding point 3022 is provided between the second free end 3020 and the second ground end 3021, and the third feeding point 3022 is electrically connected to the third feed source 70, the first antenna unit 30 supports the medium and high frequency bands under the excitation of the third feed source 70, and the medium and high frequency communication performance of the foldable electronic device 100 can be achieved.

[0098] The features mentioned in the specification, claims and drawings can be arbitrarily combined with each other as long as they are meaningful within the scope of this application. Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of this application, and these improvements and modifications are also regarded as the protection scope of this application.

Claims

1. A foldable electronic device, characterized in that: include: A bendable body, the bendable body comprising a first body, a second body and a rotating shaft assembly, the first body and the second body are rotatably connected through the rotating shaft assembly, and can be in a relatively folded state or an unfolded state, the frame of the bendable body is surrounded to form an accommodating space, the frame of the bendable body comprises a first frame, a second frame, a third frame and a fourth frame which are sequentially connected end to end, the first frame is located on a side of the first body away from the rotating shaft assembly, the third frame is located on a side of the second body away from the rotating shaft assembly, the second frame comprises a first sub-frame located between the first frame and the rotating shaft assembly and a second sub-frame located between the third frame and the rotating shaft assembly, the fourth frame comprises a third sub-frame located between the first frame and the rotating shaft assembly and a fourth sub-frame located between the third frame and the rotating shaft assembly; A reference floor, located in the accommodation space; and A first antenna unit, comprising a first antenna radiator, a parasitic radiator and a first feed source, wherein the first antenna radiator comprises a first radiating section and a second radiating section connected to each other, the first radiating section is arranged on the second sub-frame, the second radiating section is arranged on the third frame, an end of the first radiating section away from the second radiating section forms a first grounding end, the first grounding end is electrically connected to the reference floor, an end of the second radiating section away from the first radiating section forms a first free end, a first feeding point is arranged between the first grounding end and the first free end, the first feeding point is electrically connected to the first feed source, the parasitic radiator comprises a third radiating section and a fourth radiating section connected to each other, the third radiating section is arranged on the third frame, the fourth radiating section is arranged on the fourth sub-frame, an end of the third radiating section away from the fourth radiating section forms a second free end, a coupling gap is formed between the second free end and the first free end, an end of the fourth radiating section away from the third radiating section forms a second grounding end, and the second grounding end is electrically connected to the reference floor; Among them, the first feed source is used to excite the first antenna radiator and the parasitic radiator to generate a first resonant mode and a second resonant mode supporting a low frequency band, the first resonant mode is an EE radiation mode between the first antenna radiator and the parasitic radiator, and the second resonant mode is an EE balanced mode between the first antenna radiator and the parasitic radiator.

2. The foldable electronic device according to claim 1, characterized in that: The first antenna unit also includes a first tuning circuit electrically connected between the first feeding point and the first feed source, and the first tuning circuit is used to tune the working frequency band of the first antenna unit.

3. The foldable electronic device according to claim 2, characterized in that: The length of the first radiation segment is less than or equal to 1 / 16 wavelength of the working frequency band of the first antenna unit; the length of the fourth radiation segment is less than or equal to 1 / 16 wavelength of the working frequency band of the first antenna unit.

4. The foldable electronic device according to claim 2, characterized in that: The distance between the first ground end and the third frame is a first distance, the distance between the second ground end and the third frame is a second distance, and the absolute value of the difference between the first distance and the second distance is less than or equal to 1 / 16 wavelength of the working frequency band of the first antenna unit.

5. The foldable electronic device according to claim 4, characterized in that: The first frame is a top frame of the bendable body, and the second frame is a bottom frame of the bendable body; the first distance is less than or equal to the second distance.

6. The foldable electronic device according to any one of claims 1 to 5, characterized in that: The first resonant mode includes a 1 / 4 wavelength resonant mode with a first resonant current generated by the first antenna radiator and a 1 / 4 wavelength resonant mode with a second resonant current generated by the parasitic radiator, and the flow direction of the first resonant current is the same as the flow direction of the second resonant current; the second resonant mode includes a 1 / 4 wavelength resonant mode with a third resonant current generated by the first antenna radiator and a 1 / 4 wavelength resonant mode with a fourth resonant current generated by the parasitic radiator, and the flow direction of the third resonant current is opposite to the flow direction of the fourth resonant current.

7. The foldable electronic device according to claim 6, characterized in that: The first resonance mode excites the reference floor to generate a first floor current, and the first floor current is mainly distributed along the extension direction of the third frame; The second resonance mode excites the reference floor to generate a second floor current, and the second floor current is mainly distributed along the extension direction of the third frame.

8. The foldable electronic device according to claim 6, characterized in that: The first resonance mode and the second resonance mode support different low frequency bands respectively.

9. The foldable electronic device according to claim 6, characterized in that: A frequency band supported by the first resonance mode at least partially overlaps with a frequency band supported by the second resonance mode; or a frequency band supported by the first resonance mode is continuous with a frequency band supported by the second resonance mode.

10. The foldable electronic device according to any one of claims 1 to 5, characterized in that: The foldable electronic device also includes a radio frequency chip, which is disposed on the first body and electrically connected to the first feed source, and provides a radio frequency signal to the first feed source.

11. The foldable electronic device according to any one of claims 1 to 5, characterized in that: When the first body and the second body are in the unfolded state, the radiation efficiency of the foldable electronic device in the free space scenario is the first radiation efficiency, and when the first body and the second body are in the folded state, the radiation efficiency of the foldable electronic device in the free space scenario is the second radiation efficiency, the first radiation efficiency is greater than the second radiation efficiency, and the difference between the first radiation efficiency and the second radiation efficiency is less than or equal to 4dB.

12. The foldable electronic device according to claim 11, characterized in that: The second radiation efficiency is greater than or equal to 10 dB.

13. The foldable electronic device according to any one of claims 2 to 5, characterized in that: The foldable electronic device also includes a second antenna unit, which includes a second antenna radiator, a second feed source and a second tuning circuit. The second antenna radiator is arranged on the second frame or the fourth frame. One end of the second antenna radiator forms a third grounding end, and the third grounding end is electrically connected to the reference floor. The other end of the second antenna radiator forms a third free end. A second feeding point is arranged between the third grounding end and the third free end. The second feeding point is electrically connected to the second feed source through the second tuning circuit. The second antenna unit supports a low frequency band under the excitation of the second feed source.

14. The foldable electronic device according to claim 13, characterized in that: When the first body and the second body are in the folded state, the first antenna unit is in a working state, and when the first body and the second body are in the unfolded state, the second antenna unit is in a working state.

15. The foldable electronic device according to any one of claims 1 to 5, characterized in that: The foldable electronic device also includes a third feed source and a third tuning circuit. A third feeding point is provided between the second free end and the second ground end. The third feeding point is electrically connected to the third feed source through the third tuning circuit. The first antenna unit supports medium and high frequency bands under the excitation of the third feed source.

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