WO2023116022A1 - 可折叠电子设备及其天线系统 - Google Patents

可折叠电子设备及其天线系统 Download PDF

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Publication number
WO2023116022A1
WO2023116022A1 PCT/CN2022/115325 CN2022115325W WO2023116022A1 WO 2023116022 A1 WO2023116022 A1 WO 2023116022A1 CN 2022115325 W CN2022115325 W CN 2022115325W WO 2023116022 A1 WO2023116022 A1 WO 2023116022A1
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WO
WIPO (PCT)
Prior art keywords
antenna
electronic device
branch
parasitic
radiator
Prior art date
Application number
PCT/CN2022/115325
Other languages
English (en)
French (fr)
Inventor
李元鹏
周大为
Original Assignee
荣耀终端有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 荣耀终端有限公司 filed Critical 荣耀终端有限公司
Priority to EP22909347.1A priority Critical patent/EP4343969A1/en
Publication of WO2023116022A1 publication Critical patent/WO2023116022A1/zh

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/52—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure
    • H01Q1/521—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure reducing the coupling between adjacent antennas
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/002—Protection against seismic waves, thermal radiation or other disturbances, e.g. nuclear explosion; Arrangements for improving the power handling capability of an antenna
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/12—Supports; Mounting means
    • H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
    • H01Q1/2258—Supports; Mounting means by structural association with other equipment or articles used with computer equipment
    • H01Q1/2266—Supports; Mounting means by structural association with other equipment or articles used with computer equipment disposed inside the computer
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/12—Supports; Mounting means
    • H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
    • H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
    • H01Q1/241—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
    • H01Q1/242—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use
    • H01Q1/243—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use with built-in antennas
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/27—Adaptation for use in or on movable bodies
    • H01Q1/273—Adaptation for carrying or wearing by persons or animals
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/48—Earthing means; Earth screens; Counterpoises
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/28—Combinations of substantially independent non-interacting antenna units or systems
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
    • H01Q5/30—Arrangements for providing operation on different wavebands
    • H01Q5/378—Combination of fed elements with parasitic elements

Definitions

  • the present application relates to the technical field of wireless communication, and in particular to a foldable electronic device and an antenna system thereof.
  • the present application provides a foldable electronic device and its antenna system.
  • the antenna system includes a parasitic structure capable of forming a half-wavelength mode resonance, which can effectively solve the problem of the two same-frequency antennas included in the antenna system when the electronic device is in the same position. Issues with poor isolation between expanded and collapsed states.
  • the present application provides an antenna system, which is applied to a foldable electronic device.
  • the foldable electronic device includes a first body and a second body that are connected to each other and can be folded or unfolded relative to each other.
  • the antenna system includes two same-frequency antennas, a decoupling structure and a parasitic structure.
  • the two same-frequency antennas are arranged on the first body, and the two same-frequency antennas are separated by a first gap.
  • the decoupling structure is connected in series between the two same-frequency antennas.
  • the parasitic structure is disposed on the second body, and when the electronic device is in a folded state, the parasitic structure respectively at least partially overlaps with the two same-frequency antennas.
  • the parasitic structure is a 1/2 wavelength antenna structure, wherein the wavelength is the working wavelength of the two same-frequency antennas.
  • the antenna system provided by this application arranges two same-frequency antennas on the same side of the foldable electronic device, and connects the decoupling structure in series between the two same-frequency antennas, thereby using the decoupling structure to isolate all
  • the coupling path between the two same-frequency antennas passing through the first gap can effectively solve the problem that the two same-frequency antennas have poor isolation when the electronic device is in an unfolded state.
  • the antenna system also adds a 1/2 wavelength antenna structure on the other side of the electronic device, that is, a parasitic structure.
  • the parasitic structure When the electronic device is in a folded state, the parasitic structure is connected to the two Antenna coupling forms resonance in a half-wavelength mode, wherein the direction of the induced electric field formed between the two sides of the middle of the parasitic structure and the reference ground near the parasitic structure is opposite, and the induced electric field can cancel the Any one of the two same-frequency antennas is coupled to the electric field on the other antenna, thereby suppressing the radiation energy on any one of the two same-frequency antennas from being coupled to the second reference ground on the second body.
  • further improving the isolation between the first antenna and the second antenna can effectively solve the problem that the two same-frequency antennas have poor isolation when the electronic device is in a folded state question of degree.
  • the two same-frequency antennas of the antenna system have a high degree of isolation and relatively ideal antenna performance when the electronic device is in the unfolded state or the folded state, so that the electronic device including the antenna system has a relatively high performance.
  • Excellent wireless communication function
  • the two same-frequency antennas include a first antenna and a second antenna, wherein the first antenna includes a first radiating branch, the second antenna includes a second radiating branch, and the first antenna includes a second radiating branch.
  • a radiating branch is separated from the second radiating branch by the first gap.
  • the parasitic structure includes a parasitic branch, wherein, when the electronic device is in a fully folded state, the parasitic branch overlaps the first radiating branch and the second radiating branch.
  • the middle part of the parasitic branch when the electronic device is in a fully folded state, the middle part of the parasitic branch is opposite to the first slit, and the projection of the center of the first slit on the parasitic branch is The distance between the middle parts of the parasitic branches is less than or equal to one-eighth of the working wavelength of the two co-frequency antennas.
  • the parasitic branch includes a first radiator and a second radiator located on both sides of the middle of the parasitic branch, wherein when the electronic device is in a folded state, the first radiator The second radiator is arranged overlapping with the first radiating branch, and the second radiating body is arranged overlapping with the second radiating branch.
  • the first radiating stub and the second radiating stub are separated from the first reference ground on the first main body by a first slot, and the parasitic stub is separated from the second The second reference ground on the body is spaced apart by a second slot. Wherein, when the electronic device is in a folded state, the first slot is opposite to the second slot.
  • the parasitic structure when the electronic device is in the folded state and any one of the two same-frequency antennas is working, the parasitic structure is coupled with the working antenna to form a half-wavelength mode resonance, wherein, in The direction of the induced current generated on the first radiator and the second radiator is the same; the induced electric field generated in the second slot between the first radiator and the second reference ground, and The direction of the induced electric field generated in the second slot between the second radiator and the second reference ground is opposite.
  • the electric field excited by the working antenna in the first slot is compatible with that of the two antennas.
  • the electric field induced by the other antenna in the same-frequency antenna in the first slot is an electric field in the same direction.
  • the parasitic structure is a wire antenna, and the first radiator and the second radiator are integrally structured.
  • the length of the parasitic branch is half of the working wavelength of the two co-frequency antennas.
  • the wire antenna further includes two matching circuits respectively coupled to both ends of the parasitic stub, wherein the two matching circuits are used to adjust the resonant frequency of the parasitic structure so that the The induced electric field generated by the coupling between the parasitic structure and the two same-frequency antennas and the induced electric field generated by the two same-frequency antennas have a more ideal offset effect, so as to suppress any of the two same-frequency antennas.
  • the parasitic structure is a slot antenna
  • the first radiator is separated from the second radiator by a gap
  • one end of the first radiator away from the second radiator is grounded
  • One end of the second radiator away from the first radiator is grounded.
  • the lengths of the first radiator and the second radiator are a quarter of the working wavelength of the two co-frequency antennas.
  • the first radiating stub includes a first coupling end adjacent to the first slot
  • the second radiating stub includes a second coupling end adjacent to the first slot.
  • the decoupling structure is connected in series between the first coupling end of the first radiating branch and the second coupling end of the second radiating branch, and the decoupling structure is used to isolate the two same-frequency antennas A coupling path passing through the first slot.
  • the decoupling structure is a band-stop filter
  • the band-stop filter includes an inductance element, or a combination of an inductance and a capacitor.
  • the first antenna further includes a first feed point and a first ground point coupled to the first radiating stub, wherein the first feed point is connected to the first slot
  • the minimum distance between the centers of the first ground point and the center of the first slot is smaller than the minimum distance between the first ground point and the center of the first gap.
  • the second antenna further includes a second feed point and a second ground point coupled to the second radiating stub, wherein the minimum distance from the second feed point to the center of the first slot is greater than the set The minimum distance from the second ground point to the center of the first gap.
  • the first antenna further includes a first matching circuit coupled to the first feeding point, and the first matching circuit is used to achieve impedance matching of the first antenna to reduce The loss of signal energy and the improvement of the radiation efficiency of the first antenna enable the first antenna to obtain more ideal antenna performance.
  • the second antenna further includes a second matching circuit coupled to the second feeding point, the second matching circuit is used to achieve impedance matching of the second antenna, so as to reduce signal energy loss and improve the The radiation efficiency of the second antenna enables the second antenna to obtain more ideal antenna performance.
  • the second antenna further includes a third matching circuit coupled to the second ground point, and the third matching circuit is used to realize impedance matching of the second antenna, so as to improve the Describe the antenna performance of the second antenna.
  • the first body further includes a first middle frame, the first middle frame is partly or entirely made of metal material, the first radiating branch and the second radiating branch both constitute the Part of the structure of the first middle frame;
  • the second body further includes a second middle frame, wherein the first middle frame overlaps with the second middle frame when the electronic device is in a fully folded state.
  • Part or all of the second middle frame is made of metal material, and the parasitic branches constitute a part of the structure of the second middle frame.
  • the present application provides a foldable electronic device, including a first body, a second body, and the antenna system described in the first aspect above.
  • the first body and the second body are connected to each other and can be folded or unfolded relative to each other.
  • the two same-frequency antennas included in the antenna system are arranged on the first body, and the parasitic structures included in the antenna system are arranged on the second body.
  • the antenna system utilizes the two same-frequency antennas by arranging two same-frequency antennas on the same side of the foldable electronic device, and connecting the two same-frequency antennas in series with a decoupling structure.
  • the decoupling structure is used to isolate the coupling path between the two same-frequency antennas passing through the first gap, which can effectively solve the problem that the two same-frequency antennas have poor isolation when the electronic device is in the unfolded state. question.
  • the antenna system also adds a 1/2 wavelength antenna structure on the other side of the electronic device, that is, a parasitic structure.
  • the parasitic structure When the electronic device is in a folded state, the parasitic structure is connected to the two Antenna coupling forms resonance in a half-wavelength mode, wherein the direction of the induced electric field formed between the two sides of the middle of the parasitic structure and the reference ground near the parasitic structure is opposite, and the induced electric field can cancel the Any one of the two same-frequency antennas is coupled to the electric field on the other antenna, thereby suppressing the radiation energy on any one of the two same-frequency antennas from being coupled to the second reference ground on the second body.
  • further improving the isolation between the first antenna and the second antenna can effectively solve the problem that the two same-frequency antennas have poor isolation when the electronic device is in a folded state question of degree.
  • the two same-frequency antennas of the antenna system have a high degree of isolation and relatively ideal antenna performance when the electronic device is in the unfolded state or the folded state, so that the electronic device including the antenna system has a relatively high performance.
  • Excellent wireless communication function
  • Fig. 1 is a schematic structural diagram of a foldable electronic device provided in an embodiment of the present application, wherein the electronic device is in an unfolded state.
  • FIG. 2 is a schematic structural diagram of the electronic device shown in FIG. 1 in a folded state.
  • FIG. 3 is a schematic structural diagram of functional modules of the electronic device shown in FIG. 1 , wherein the electronic device includes an antenna system, and the antenna system includes at least two antennas of the same frequency: a first antenna and a second antenna.
  • FIG. 4 is a schematic diagram of an exploded structure of the electronic device shown in FIG. 1 .
  • FIG. 5 is a schematic diagram of the installation positions of two co-frequency antennas included in the antenna system provided in the first embodiment of the present application on the housing of the electronic device in a folded state.
  • FIG. 6 is a schematic top view of the arrangement positions of two co-frequency antennas included in the antenna system shown in FIG. 5 on the first body.
  • FIG. 7 is a schematic diagram of an equivalent structure of the antenna system shown in FIG. 5 .
  • FIG. 8 is a schematic diagram of S-parameter curves of two co-frequency antennas included in the antenna system shown in FIG. 7 when the electronic device is in a folded state.
  • FIG. 9 is a schematic diagram of an equivalent structure of the antenna system provided in the second embodiment of the present application, wherein the antenna system includes a decoupling structure.
  • Fig. 10(a) is a simulation diagram of current distribution on the two antennas of the same frequency included in the antenna system shown in Fig. 9 when the electronic device is in the unfolded state and the first antenna is excited.
  • Fig. 10(b) is a simulation diagram of the electric field distribution on the two same-frequency antennas included in the antenna system shown in Fig. 9 when the electronic device is in the unfolded state and the first antenna is excited.
  • Fig. 10(c) is a simulation diagram of the current distribution on the two same-frequency antennas included in the antenna system shown in Fig. 9 when the electronic device is in the unfolded state and the second antenna is excited.
  • FIG. 10( d ) is a simulation diagram of the electric field distribution on the two same-frequency antennas included in the antenna system shown in FIG. 9 when the electronic device is in the deployed state and the second antenna is excited.
  • FIG. 11 is a schematic diagram of S-parameter curves of two co-frequency antennas included in the antenna system shown in FIG. 9 when the electronic device is in a deployed state.
  • Fig. 12(a) is a simulation diagram of the current distribution on the two same-frequency antennas included in the antenna system shown in Fig. 9 when the electronic device is in the folded state and the second antenna is excited.
  • Fig. 12(b) is a simulation diagram of the electric field distribution on the two same-frequency antennas included in the antenna system shown in Fig. 9 when the electronic device is in a folded state and the second antenna is excited.
  • FIG. 13 is a schematic diagram of S-parameter curves of two co-frequency antennas included in the antenna system shown in FIG. 9 when the electronic device is in a folded state.
  • Fig. 14(a) is the electric field distribution between the two co-frequency antennas included in the antenna system shown in Fig. 9 and the second reference ground on the second body when the electronic device is in the folded state and the second antenna is excited Schematic diagram of the principle.
  • Fig. 14(b) is a cross-sectional view of the structure shown in Fig. 14(a) along the I-I direction, and schematically shows the distribution direction of the electric field generated by the excitation of the second antenna.
  • Figure 14(c) is the electric field distribution between the two co-frequency antennas included in the antenna system shown in Figure 9 and the first reference ground on the first body when the electronic device is in a folded state and the second antenna is excited Schematic diagram of the principle.
  • Fig. 14(d) shows the first contact between the two same-frequency antennas included in the antenna system shown in Fig. 9 and the first reference ground on the first body when the electronic device is in a folded state and the second antenna is excited. Simulation diagram of the electric field distribution formed in the slot.
  • FIG. 15 is a schematic diagram of the installation position of the antenna system provided in the third embodiment of the present application on a folded electronic device.
  • FIG. 16 is a schematic diagram of the installation position of the antenna system provided on the housing of the electronic device in the unfolded state according to the third embodiment of the present application, wherein the antenna system includes a parasitic structure.
  • FIG. 17 is a schematic diagram of the installation position of the antenna system shown in FIG. 16 on the housing of the folded electronic device.
  • FIG. 18 is a schematic top view of the disposition position of the parasitic structure contained in the antenna system shown in FIG. 16 on the second body.
  • Fig. 19 is a schematic diagram of an equivalent structure of the antenna system provided by the third embodiment.
  • FIG. 20 is a schematic diagram of the principle of current and electric field distribution when the parasitic structure shown in FIG. 19 is excited.
  • Fig. 21(a) is a schematic diagram of the principle of electric field distribution between the two same-frequency antennas included in the antenna system shown in Fig. 19 and the parasitic structure when the electronic device is in a folded state and the second antenna is excited.
  • Figure 21(b) is a partial cross-sectional view of the structure shown in Figure 21(a) along the II-II direction, and schematically shows the distribution direction of the electric field generated by the excitation of the second antenna, and the induction of the parasitic structure direction of electric field distribution.
  • Fig. 21(c) is the electric field distribution between the two same-frequency antennas included in the antenna system shown in Fig. 19 and the first reference ground on the first body when the electronic device is in the folded state and the second antenna is excited Schematic diagram of the principle.
  • Fig. 21(d) is a schematic diagram of the principle of electric field distribution between the parasitic structure included in the antenna system shown in Fig. 19 and the second reference ground on the second body when the electronic device is in a folded state and the second antenna is excited.
  • Fig. 21(e) is a partial cross-sectional view of the structure shown in Fig. 21(a) along the III-III direction, and schematically shows the distribution directions of electric fields induced by the first antenna and the parasitic structure respectively.
  • Fig. 22(a) shows the first connection between the two same-frequency antennas included in the antenna system shown in Fig. 19 and the first reference ground on the first body when the electronic device is in a folded state and the second antenna is excited. Simulation diagram of the electric field distribution formed in the slot.
  • Fig. 22(b) is a schematic diagram of S-parameter curves of two co-frequency antennas included in the antenna system shown in Fig. 19 when the electronic device is in a folded state.
  • Fig. 23 is a schematic diagram of another equivalent structure of the antenna system provided by the third embodiment.
  • FIG. 24 is a schematic top view of the arrangement position of the parasitic structure contained in the antenna system shown in FIG. 23 on the second body.
  • FIG. 25 is a schematic diagram of the principle of current and electric field distribution when the parasitic structure shown in FIG. 23 is excited.
  • first matching circuit 216 first coupled end 217 second antenna twenty two Second Radiant Branch 221 second feed point 222 second grounding point 223 second feeding stub 224 second ground stub 225 second matching circuit 226 third matching circuit 227 second coupled end 228 decoupling structure twenty three parasitic structure 24, 24' wire antenna twenty four slot antenna twenty four' parasitic branch 241, 241' first radiator L1, L1' second radiator L2, L2' Fourth matching circuit 242 fifth matching circuit 243 RF module 25 processor 31 memory 32 power module 33 Other input and output devices 34 shell 40 Middle frame 41 first middle frame 411 first subparagraph T1 second subparagraph T2 third subparagraph T3 second middle frame 412 fourth subparagraph T4 fifth subparagraph T5 sixth subparagraph T6 back cover 42 first back cover 421 second back cover 422 internal structure 50
  • first circuit board assembly 511 first battery unit 512 second circuit board assembly 521 second battery unit 522 middle gap G0 first gap G1 second gap G2 third gap G3 fourth gap G4 fifth gap G5 first slot S1 second slot S2 first coupling path P1 second coupling path P2 first edge area A second edge area B first electric field E1 second electric field E2 third electric field E3 fourth electric field E4 fifth electric field E5 sixth electric field E6 seventh electric field E7
  • the present application provides a foldable electronic device, which includes a first body and a second body that can be folded or unfolded relative to each other, and an antenna system.
  • the antenna system includes two same-frequency antennas arranged on the first body, a decoupling structure connected in series between the two same-frequency antennas, and a parasitic structure arranged on the second body. Wherein, the two same-frequency antennas are separated by a first slot.
  • the parasitic structure respectively at least partially overlaps with the two same-frequency antennas.
  • the decoupling structure is connected in series between the two same-frequency antennas, and the antenna system uses the decoupling structure to block the coupling path between the two same-frequency antennas passing through the first slot, so that It effectively solves the problem that the two same-frequency antennas have poor isolation when the electronic equipment is in the unfolded state.
  • the parasitic structure is a 1/2 wavelength antenna structure, wherein the wavelength is the working wavelength of the two same-frequency antennas.
  • the antenna system uses the parasitic structure to couple with the working antenna to form a half-wavelength mode resonance, wherein, The direction of the induced electric field formed between the two sides of the middle of the parasitic structure and the reference ground near the parasitic structure is opposite, and the induced electric field is used to cancel the coupling from the working antenna to the two same-frequency antennas
  • the electric field on the other antenna so as to suppress the radiation energy on any one of the two same-frequency antennas from being coupled to the other antenna through the second reference ground on the second body, thereby improving the
  • the isolation between the first antenna and the second antenna can effectively solve the problem that the two same-frequency antennas have poor isolation when the electronic device is in a folded state.
  • the two same-frequency antennas of the antenna system have a high degree of isolation and relatively ideal antenna performance when the electronic device is in the unfolded state or the folded state, so that the electronic device including the antenna system has a relatively high performance.
  • Excellent wireless communication function
  • the electronic device 100 includes, but is not limited to, electronic devices such as mobile phones, tablet computers, and wearable devices.
  • the electronic device 100 includes a first body 11 and a second body 12 connected to each other.
  • the electronic device 100 further includes a connecting portion 13 disposed between the first body 11 and the second body 12, and the first body 11 and the second body 12 pass through the The connecting part 13 is connected, and the two can be relatively folded or unfolded through the connecting part 13, so that the electronic device 100 can have two usage modes, wherein, FIG. 1 shows that the electronic device 100 is in an unfolded state
  • FIG. 2 shows a schematic structural diagram of the electronic device 100 in a folded use mode. As shown in FIG. 2 , when the electronic device 100 is in a folded state, a middle gap G0 is formed between the first body 11 and the second body 12 .
  • the electronic device 100 can also be provided with a connection structure (not shown in the figure) on the connection portion 13 between the first body 11 and the second body 12, such as a rotating shaft or a hinge structure, etc., the first body 11 and the second main body 12 are connected through the connection structure, and the two can rotate through the connection structure, so that the two can switch between a relatively folded state and a relatively unfolded state.
  • a connection structure (not shown in the figure) on the connection portion 13 between the first body 11 and the second body 12, such as a rotating shaft or a hinge structure, etc.
  • the electronic device 100 further includes a display screen 14 arranged on the first body 11 and the second body 12, and the display screen 14 is used to display visual output to the user, so
  • the visual output may include graphics, text, icons, video, and the like.
  • the display screen 14 may include a first display screen 141 and a second display screen 142, wherein the first display screen 141 may be set on the first main body 11, and the second display screen 142 may be set on the on the second main body 12.
  • one of the first display screen 141 and the second display screen 142 may be set as a main screen, and the other display screen may be set as a secondary screen.
  • the first display screen 141 and the second display screen 142 are coupled to each other, so that the display screen 14 can be continuously arranged on the first body 11 and the second body 12 In this way, the first display screen 141 and the second display screen 142 can form a complete plane when the electronic device 100 is in the fully unfolded state, so that the electronic device 100 in the unfolded state It has a continuous large-area display screen to realize the function of large-screen display and can meet the needs of users for large-screen display.
  • the electronic device 100 has a small-area display screen when it is in a folded state, which can meet the user's need for easy portability.
  • the display screen 14 may be a flexible screen.
  • the display screen 14 can be hidden inside the electronic device 100 when the electronic device 100 is in a folded state, or can be exposed outside the electronic device 100 .
  • the presentation manner of the display screen 14 when the electronic device 100 is in the folded state is not limited. In Fig. 2, the display screen 14 is exposed on the outside of the electronic device 100 when the electronic device 100 is in a folded state as an example for illustration.
  • FIG. 3 shows a schematic structural diagram of functional modules of the electronic device 100 .
  • the electronic device 100 may further include a processor 31 , a memory 32 , a power module 33 and other input and output devices 34 .
  • the processor 31 serves as the logic operation and control center of the electronic device 100, and is mainly responsible for functions such as data collection, data conversion, data processing, logic operation, communication, and execution drive output.
  • the processor 31 may include a plurality of input and output ports, and the processor 31 may communicate and exchange information with other functional modules or external devices through the plurality of input and output ports, so as to realize the driving of the electronic device 100 and control functions.
  • the memory 32 can be accessed by the processor 31 or a peripheral interface (not shown), so as to store or call data.
  • the memory 32 may include a high-speed random access memory, and may also include a non-volatile memory, such as one or more magnetic disk storage devices, flash memory devices, or other volatile solid-state storage devices.
  • the power supply module 33 is used to supply power to other functional modules of the electronic device 100 and perform power management, so that other functional modules of the electronic device 100 can work normally.
  • the other input and output devices 34 may include devices for implementing functions supported by the electronic device 100, such as speakers, touch pads, cameras, function keys, I/O ports, etc., so that the electronic device 100 and user interaction.
  • the electronic device 100 also has a wireless communication function, and accordingly, the electronic device 100 further includes an antenna system 200, and the antenna system 200 includes at least an antenna 20 and a radio frequency module 25, wherein the antenna 20 can be coupled to the radio frequency module 25 through a transmission element (not shown), such as a coaxial cable or a microstrip line, so as to realize wireless signal transmission, thereby establishing communication between the electronic device 100 and other network devices.
  • the antenna 20 in order to meet the needs of users for various wireless communication technologies, the antenna 20 usually includes multiple antenna units, and each antenna unit can be used to cover a single or multiple communication frequency bands. Different antenna units can also It can be reused to improve the utilization rate of the antenna.
  • the plurality of antenna units can be distributed on the first body 11 and/or the second body 12, and the antenna forms can be various, such as monopole (monopole) antenna, dipole (dipole) ) antenna, inverted F-shaped antenna (IFA), left-handed antenna and other forms.
  • monopole monopole
  • dipole dipole
  • IFA inverted F-shaped antenna
  • the electronic device 100 may also include a circuit board assembly (not shown) disposed inside the first body 11 and/or the second body 12, and the circuit board assembly is used to set the Electronic components included in the electronic device 100, such as the radio frequency module 25, the processor 31, the memory 32, and the like.
  • the circuit board assembly may be a flexible circuit board assembly or a rigid-flex circuit board assembly.
  • FIG. 4 shows a schematic diagram of an exploded structure of the electronic device 100 .
  • the electronic device 100 at least includes a display screen 14 , a casing 40 , and an internal structure 50 housed in a cavity surrounded by the display screen 14 and the casing 40 .
  • the housing 40 includes a middle frame 41 and a rear cover 42 , and the middle frame 41 is at least connected to an edge area of the rear cover 42 .
  • the middle frame 41 includes a first middle frame 411 corresponding to the first body 11 and a second middle frame 412 corresponding to the second body 12 .
  • the rear cover 42 includes a first rear cover 421 corresponding to the first main body 11 and a second rear cover 422 corresponding to the second main body 12 .
  • the whole formed by the first middle frame 411 and the first rear cover 421 , and the whole formed by the second middle frame 412 and the second rear cover 422 can be connected through the connection part 13 .
  • the first body 11 and the second body 12 are overlapped so that the first middle frame 411 and the second The two middle frames 412 are overlapped, and the first rear cover 421 and the second rear cover 422 are overlapped.
  • the antenna 20 can be disposed on the middle frame 41 and/or the rear cover.
  • the internal structure 50 includes but is not limited to a first circuit board assembly 511 and a first battery unit 512 corresponding to the first body 11, and a first battery unit 512 corresponding to the second The second circuit board assembly 521 and the second battery unit 522 of the main body 12 .
  • the first circuit board assembly 511 is used to set the electronic components contained in the first body 11
  • the second circuit board assembly 521 is used to set the electronic components contained in the second body 12
  • the The first battery unit 512 and the second battery unit 522 are used to supply power to electronic components disposed on the first body 11 and/or the second body 12 .
  • the electronic device 100 may also include one battery unit or more than two battery units.
  • the electronic device 100 shown in FIG. 3 and FIG. 4 is only an example of the electronic device, and the electronic device 100 may have more or more Fewer components, two or more components may be combined, or may have different component configurations.
  • the antenna system 200 includes at least a first antenna 21 and a second antenna 22, wherein the first antenna 21 and the second antenna 22 are two same-frequency antennas , the first antenna 21 and the second antenna 22 are arranged on the edge area of the electronic device 100, for example, on the middle frame 41 or on the rear cover 42 near the middle frame 41 .
  • the first antenna 21 and the second antenna 22 are both arranged in the first edge area A (as shown in FIG. 1 ) of the first body 11 as an example, and the antenna system 200 The structure is introduced.
  • FIGS. 4-5 are schematic diagrams showing the installation positions of the two same-frequency antennas included in the antenna system 201 in the first embodiment on the casing 40 of the electronic device 100 .
  • the first antenna 21 and the second antenna 22 are both arranged on the first middle frame 411 corresponding to the first body 11, and the first antenna 21 and the The second antennas 22 are separated by the first gap G1.
  • the first antenna 21 includes a first radiation branch 211
  • the second antenna 22 includes a second radiation branch 221
  • the first radiation branch 211 and the second radiation branch 221 pass through the first radiation branch 221.
  • a gap G1 is spaced apart.
  • the first middle frame 411 may be partially or entirely made of metal material, and the first radiating branches 211 and the second radiating branches 221 both constitute the first middle frame 411 part of the structure.
  • the first middle frame 411 may be partly or entirely made of non-conductive material (such as glass or plastic, etc.), and the first radiating branch 211 and the second radiating branch 221 They are all pasted on the inside of the first middle frame 411 .
  • the first back cover 421 may be made of metal material, and both the first radiating branch 211 and the second radiating branch 221 constitute a part of the structure of the first back cover 421 .
  • the first radiating branch 211 and the second radiating branch 221 may be cut-off metal accessories obtained by slits on the first rear cover 421 .
  • the first rear cover 421 can be made of non-conductive material (such as glass or plastic, etc.), and the first radiating branch 211 and the second radiating branch 221 are attached to the The inner side of the first rear cover 421 .
  • the first antenna 21 further includes a first feed point 212 and a first ground point 213 coupled to the first radiation branch 211
  • the second antenna 22 further includes a second feed point 222 and a second ground point 223 coupled to the second radiating branch 221 .
  • the first middle frame 411 is provided with the first gap G1 and the second gap G2, and the first gap G1 and the second gap G2 divide the first middle frame 411 into successively adjacent second gaps.
  • the first subsection T1 is respectively coupled to the first feed point 212 and the first ground point 213, wherein the minimum distance from the first feed point 212 to the center of the first gap G1 less than the minimum distance from the first ground point 213 to the center of the first gap G1, between the first subsection T1 and the first ground point 213 coupled to the first gap G1
  • the metal segment of is the first radiating branch 211.
  • the second subsection T2 is respectively coupled to the second feeding point 222 and the second grounding point 223, wherein the minimum distance from the second feeding point 222 to the center of the first gap G1 Greater than the minimum distance from the second ground point 223 to the center of the first gap G1 , the second subsection T2 is the second radiating stub 221 .
  • the first radiating stub 211 and the second radiating stub 221 are separated from the first reference ground 111 on the first main body 11 by the first slot S1 respectively.
  • the first reference ground 111 is a plurality of metal components on the first body 11, such as the first middle frame 411 included except the first radiation branch 211 and the second radiation branch 221
  • Other metal structures, the ground layer of the first circuit board assembly 511 , the metal structure included in the first rear cover 421 , the metal structure included in the first battery unit 512 , etc. are combined.
  • the first reference ground 111 is represented by a complete block equivalent structure with a certain thickness in the present application.
  • the first feed point 212 can be coupled with the first radio frequency module (not shown) included in the radio frequency module 25 through a connector (not shown), for example, the The connecting member may include an elastic component and a microstrip line on the first circuit board assembly 511 , and the elastic component is coupled to the first radio frequency module through the microstrip line.
  • the first radiation branch 211 is grounded through the first ground point 213 and coupled with the first radio frequency module through the first feeding point 212 .
  • the first radiation branch 211 receives the internal electromagnetic wave signal input by the first radio frequency module through the first feeding point 212, and radiates the internal electromagnetic wave signal to the outside.
  • the first radiation branch 211 is also used to receive external electromagnetic wave signals, and transmit the external electromagnetic wave signals to the first radio frequency module through the first feeding point 212, and then the processor 31 Corresponding signal processing is performed on the external electromagnetic wave signal, so that the wireless communication between the electronic device 100 and the external device can be realized through the first antenna 21 .
  • the second feeding point 222 can be coupled with a second radio frequency module (not shown) included in the radio frequency module 25 through a connector (not shown).
  • the second radiation branch 221 is grounded through the second ground point 223 and coupled with the second radio frequency module through the second feed point 222 .
  • the working principle of the second antenna 22 is the same as that of the first antenna 21 , and will not be repeated here.
  • the second reference ground 121 on the second body 12 is close to the first radiating stub 211 and the second radiating stub 221 .
  • the second reference ground 121 is composed of several metal components on the second body 12, such as the metal structure contained in the second middle frame 412, the ground layer of the second circuit board assembly 521, the The combination of the metal structure included in the second rear cover 422, the metal structure included in the second battery unit 522, and the like.
  • the second reference ground 121 is represented by a complete block equivalent structure with a certain thickness in the present application.
  • a first feed branch 214 coupled to the first feed point 212 and coupled to the first ground point 213 may also extend from the first radiation branch 211 The first ground stub 215 of .
  • a second feeding branch 224 coupled to the second feeding point 222 and a second grounding branch 225 coupled to the second grounding point 223 may extend from the second radiation branch 221 .
  • first feed point 212 and the first ground point 213 may be directly arranged on the first radiating branch 211, and the second feed point 222 and The second grounding point 223 can be directly disposed on the second radiating branch 221 .
  • the first antenna 21 also includes a first matching circuit 216 coupled to the first feeding point 212, the first matching circuit 216 is used to achieve impedance matching of the first antenna 21 to reduce signal energy Loss and improve the radiation efficiency of the first antenna 21, so that the first antenna 21 can obtain more ideal antenna performance.
  • the second antenna 22 also includes a second matching circuit 226 coupled to the second feeding point 222, and the second matching circuit 226 is used to achieve impedance matching of the second antenna 22 to reduce signal energy loss and increase the radiation efficiency of the second antenna 22, so that the second antenna 22 can obtain more ideal antenna performance.
  • the second antenna 22 may further include a third matching circuit 227 coupled to the second ground point 223, and the third matching circuit 227 is used to more flexibly realize the function of the second antenna 22. impedance matching, so as to improve the antenna performance of the second antenna 22 .
  • first matching circuit 216 the second matching circuit 226 , and the third matching circuit 227 can all be disposed on the first circuit board assembly 511 .
  • Each matching circuit may include one or more of capacitors, inductors, or switching elements, and its specific circuit architecture may be set according to actual needs, which is not specifically limited in this application.
  • both the first antenna 21 and the second antenna 22 are used to provide resonance.
  • the first radiating branch 211 can excite a radio frequency electromagnetic field, radiate electromagnetic waves into space, and form a corresponding resonance.
  • the second radiating branch 221 can excite a radio frequency electromagnetic field, radiate electromagnetic waves into space, and form a corresponding resonance.
  • the first antenna 21 and the second antenna 22 can be low-band antennas (600MHz to 960MHz), such as LTE B28 (703MHz to 803MHz), LTE B5 (824MHz to 894MHz), LTE B8 (880MHz to 960MHz), etc.
  • LTE B28 703MHz to 803MHz
  • LTE B5 824MHz to 894MHz
  • LTE B8 880MHz to 960MHz
  • the opposite ends of the two antennas form a "capacitor"
  • a first coupling path P1 passing through the first radiation branch 211 , the first gap G1 and the second radiation branch 221 is formed between the first antenna 21 and the second antenna 22 , so that the Electric field coupling occurs between the first antenna 21 and the second antenna 22 through the first coupling path P1.
  • the isolation between the first antenna 21 and the second antenna 22 will be caused when the electronic device 100 is in the unfolded state or The time in the folded state is low, which affects the working performance and radiation efficiency of the two co-frequency antennas.
  • FIG. 8 shows a schematic diagram of S-parameter curves of two co-frequency antennas included in the antenna system 201 of the first embodiment when the electronic device 100 is in a folded state. It can be seen from the curve S21 in FIG. 8 that the isolation of the two co-frequency antennas of the antenna system 201 in the working frequency band 0.8GHZ-0.95GHz is about -5dB, which is relatively poor.
  • the present application also provides an antenna system 202 according to a second embodiment.
  • the structure of the antenna system 202 provided in the second embodiment is similar to the structure of the antenna system 201 shown in FIG. 7 , the difference is that the antenna system 202 provided in the second embodiment also includes A decoupling structure 23 connected in series between the two same-frequency antennas, the decoupling structure 23 is used to block the first coupling path P1 passing through the first gap G1 between the two same-frequency antennas , so that the first antenna 21 and the second antenna 22 cannot be coupled through the first coupling path P1.
  • the first radiation branch 211 further includes a first coupling end 217 adjacent to the first slot G1
  • the second radiation branch 221 further includes a second coupling end adjacent to the first slot G1. End 228.
  • the decoupling structure 23 is connected in series between the first coupling end 217 of the first radiating branch 211 and the second coupling end 228 of the second radiating branch 221, so that the decoupling structure 23 can be used to isolate The first coupling path P1 between the first antenna 21 and the second antenna 22 .
  • the decoupling structure 23 is a band-stop filter, wherein the band-stop filter may include an inductance element, or a combination of an inductor and a capacitor.
  • the decoupling structure 23 can be disposed on the first circuit board assembly 511 . In other implementations, the decoupling structure 23 may be disposed in the first gap G1.
  • the band-stop filter including an inductance element
  • the first antenna 21 and the second antenna 22 can be cut off.
  • the inductance value range of the inductance element is between 3nH-300nH.
  • FIG. 10( a ) shows a simulation diagram of current distribution on two antennas with the same frequency included in the antenna system 202 shown in FIG. 9 when the electronic device 100 is in the unfolded state and the first antenna 21 is excited.
  • FIG. 10( b ) shows a simulation diagram of the electric field distribution on the two same-frequency antennas included in the antenna system 202 shown in FIG. 9 when the electronic device 100 is in the unfolded state and the first antenna 21 is excited. It can be seen from Fig. 10(a)-Fig. 10(b), after the antenna system 202 adopts the decoupling structure 23, when the electronic device 100 is in the unfolded state and the first antenna 21 is excited , the current and electric field excited on the first antenna 21 will not be coupled to the second antenna 22 basically.
  • FIG. 10(c) shows that when the electronic device 100 is in the unfolded state and the second antenna 22 is excited, the current distribution simulation on the two same-frequency antennas included in the antenna system 202 shown in Fig. 9 picture.
  • FIG. 10( d ) shows a simulation diagram of the electric field distribution on the two same-frequency antennas included in the antenna system 202 shown in FIG. 9 when the electronic device 100 is in the unfolded state and the second antenna 22 is excited. It can be seen from Fig. 10(c)-Fig. 10(d), after the antenna system 202 adopts the decoupling structure 23, when the electronic device 100 is in the unfolded state and the second antenna 22 is excited , the current and electric field excited on the second antenna 22 will not be coupled to the first antenna 21 substantially.
  • FIG. 11 is a schematic diagram of S-parameter curves of the two co-frequency antennas included in the antenna system 202 shown in FIG. 9 when the electronic device 100 is in a deployed state. It can be seen from the curve S21 in FIG. 11 that when the electronic device 100 is in the unfolded state, the isolation of the two co-frequency antennas of the antenna system 202 in the working frequency band 0.8GHZ-1GHz is about -20dB, and the isolation higher.
  • FIG. 12( a ) shows a simulation diagram of the current distribution on the two same-frequency antennas included in the antenna system 202 shown in FIG. 9 when the electronic device 100 is in a folded state and the second antenna 22 is excited. It can be seen from FIG. 12(a) that when the electronic device 100 is in the folded state and the second antenna 22 is excited, although the antenna system 202 includes the decoupling structure 23, the second The current excited on the antenna 22 will still be coupled to the first antenna 21 . Similarly, when the first antenna 21 is excited, the current excited on the first antenna 21 will also be coupled to the second antenna 22 .
  • FIG. 12( b ) shows a simulation diagram of the electric field distribution on the two same-frequency antennas included in the antenna system 202 shown in FIG. 9 when the electronic device 100 is in a folded state and the second antenna 22 is excited. It can be seen from FIG. 12(b) that when the electronic device 100 is in the folded state and the second antenna 22 is excited, although the antenna system 202 includes the decoupling structure 23, the second The electric field excited on the antenna 22 will still be coupled to the first antenna 21 . Similarly, when the first antenna 21 is excited, the electric field excited on the first antenna 21 will also be coupled to the second antenna 22 .
  • FIG. 13 is a schematic diagram of S-parameter curves of two co-frequency antennas included in the antenna system 202 shown in FIG. 9 when the electronic device 100 is in a folded state. It can be seen from the curve S21 in FIG. 13 that when the electronic device 100 is in the folded state, the isolation of the two co-frequency antennas of the antenna system 202 is about -12dB when the operating frequency is around 0.96GHz, and the isolation degree is still poor.
  • the decoupling structure 23 connected in series between the first radiating branch 211 and the second radiating branch 221, that is, a band-stop filter including an inductance element, can only isolate the first antenna in the unfolded state. 21 and the second antenna 22, but cannot cut off the current and electric field coupling between the first antenna 21 and the second antenna 22 in the folded state.
  • the electronic device 100 is in the folded state, current and electric field coupling still occur between the first antenna 21 and the second antenna 22, resulting in a low isolation between the two, which affects two The working performance and radiation efficiency of the frequency antenna.
  • FIG. 14(a) and FIG. 14(b) Please refer to FIG. 14(a) and FIG. 14(b) together.
  • the excitation of the second antenna 22 when the electronic device 100 is in the folded state, when the second feeding point 222 feeds the When the second radiating branch 221 feeds power, a current is excited on the second radiating branch 221 , and an electric field is excited around the second radiating branch 221 .
  • the electronic device 100 when the electronic device 100 is in the folded state, since the second reference ground 121 is close to the second radiation branch 221 and the middle gap G0 is formed between the two, therefore, the The second radiation branch 221 and the second reference ground 121 form a "capacitor", between which the first electric field E1 can be formed.
  • the first electric field E1 is also coupled to the first radiation branch 211 of the first antenna 21 through the middle gap G0 and the second reference ground 121, therefore, A current is induced on the first radiation branch 211 . Since the first reference ground 111 is close to the first radiating branch 211 and there is the first slot S1 between them, the induced current on the first radiating branch 211 is in the first An electromotive force is induced on the first reference ground 111 near the radiation stub 211 . Thus, as shown in FIG. 14( c ), a third electric field E3 will be formed in the first slot S1 between the first radiation branch 211 and the first reference ground 111 .
  • Fig. 14(a)-Fig. 14(c) at the first time t1, if the surface of the second radiating branch 221 is negatively charged, the negatively charged second radiating branch 221 will be on its Positive charges are induced on the nearby second reference ground 121 and the first reference ground 111 .
  • the direction of the first electric field E1 formed in the middle gap G0 is from the second reference ground 121 to the second radiation branch 221 (as shown in Figure 14(a) and Figure 14(b) The direction shown)
  • the direction of the second electric field E2 formed in the first slot S1 is from the first reference ground 111 to the second radiation branch 221 (as shown in Figure 14(b) and the direction shown in Figure 14(c)).
  • the positively charged second reference ground 121 will induce negative charges on the first radiation branch 211, so that the direction of the third electric field E3 formed in the first slot S1 is Pointing from the first reference ground 111 to the first radiation branch 211 (the direction shown in FIG. 14( c )).
  • the directions of the first electric field E1, the second electric field E2, and the third electric field E3 will all be reversed, that is, The direction of the first electric field E1 formed in the middle gap G0 is from the second radiation branch 221 to the second reference ground 121, the second electric field formed in the first slot S1
  • the direction of the electric field E2 is from the second radiating branch 221 to the first reference ground 111
  • the direction of the third electric field E3 in the first slot S1 is from the first radiating branch 211 to The first reference ground 111 .
  • the antenna system 202 includes the decoupling structure 23, the excitation The electric field generated by one of the antennas will be coupled to the other antenna through the second reference ground 121 on the second body 12, therefore, the first antenna 21 and the second antenna 22 will pass through the Electric field coupling occurs on the second reference ground 121 . That is to say, the second reference ground 121 on the second body 12 provides a second coupling path P2 for the first body 11 and the second body 12 (as shown in FIG.
  • the second coupling path P2 passes through the first radiating stub 211 , the middle gap G0 , the second reference ground 121 , and the second radiating stub 221 . In this way, electric field coupling can occur between the first antenna 21 and the second antenna 22 through the second coupling path P2, thus causing the first antenna 21 and the second antenna 22 to be connected to each other in the electronic device.
  • the 100 When the 100 is in a folded state, it has low isolation, which affects the working performance and radiation efficiency of the two co-frequency antennas.
  • Figure 14(d) shows that when the electronic device 100 is in a folded state and the second antenna 22 is excited, the two co-frequency antennas included in the antenna system 202 shown in Figure 9 and the first reference on the first body 11 A simulation diagram of the electric field distribution formed in the first slot S1 between the grounds 111 . It can be seen from FIG. 14( d ) that a large part of the energy of the electric field generated by the second antenna 22 is coupled to the first antenna 21 .
  • the direction of the second electric field E2 is the same as that of the third electric field E3, that is, in the first slot S1
  • the The second electric field E2 excited by the second antenna 22 is in the same direction as the third electric field E3 induced by the first antenna 21 .
  • the present application also provides a third Antenna system 203 of an embodiment.
  • FIG. 15 shows a schematic diagram of the installation position of the antenna system 203 on the electronic device 100 in a folded state.
  • 16-17 are schematic diagrams showing the installation positions of the antenna system 203 on the casing 40 of the electronic device 100 according to the third embodiment.
  • the structure of the antenna system 203 of the third embodiment is similar to the structure of the antenna system 202 of the second embodiment, the difference is that the antenna system 203 of the third embodiment is also It includes a parasitic structure 24 disposed on the other body of the electronic device 100 , and the parasitic structure 24 is at least partially overlapped with the two co-frequency antennas respectively when the electronic device 100 is in a folded state.
  • the parasitic structure 24 is an antenna structure capable of forming a reverse electric field between both sides of the middle of the parasitic branch 241 and the second reference ground when excited.
  • the parasitic structure 24 is an antenna structure of 1/2 wavelength and works in a half-wavelength mode, wherein the wavelength is the working wavelength of the two antennas with the same frequency.
  • the parasitic structure 24 is used to couple with the working antenna to form a half-wavelength mode resonance, wherein, in The direction of the induced electric field formed between the two sides of the middle of the parasitic structure 24 and the second reference ground 121 near the parasitic structure 24 is opposite, and the induced electric field is used to cancel the coupling from the working antenna to the two reference grounds.
  • the electric field on the other antenna of the two same-frequency antennas so as to suppress the radiated energy on any one of the two same-frequency antennas from being coupled to the other through the second reference ground 121 on the second body. antenna, so as to improve the isolation between the first antenna 21 and the second antenna 22 .
  • the first antenna 21 and the second antenna 22 are arranged on one of the main bodies of the electronic device 100, such as the first In an edge area A, the parasitic structure 24 is disposed in another body of the electronic device 100, such as the second edge area B of the second body 12, wherein the first edge area A and the second edge area B may be a position on the middle frame 41 or a position of the rear cover 42 close to the middle frame 41 .
  • the first edge area A and the second edge area B are overlapped when the electronic device 100 is in a folded state.
  • the first antenna 21 and the second antenna 22 can be arranged on the first middle frame 411 , and correspondingly, the parasitic structure 24 can be arranged on the second middle frame 412 superior.
  • the first antenna 21 and the second antenna 22 can be arranged on the first rear cover 421 close to the first middle frame 411, correspondingly, the parasitic structure 24
  • the second rear cover 422 may be disposed near the second middle frame 412 .
  • the two same-frequency antennas are arranged on the first middle frame 411 of the first body 11, and the parasitic structure 24 is arranged on the second body 12
  • the structure of the antenna system 203 will be introduced by taking the second middle frame 412 as an example.
  • the parasitic structure 24 includes a parasitic branch 241 , wherein, when the electronic device 100 is in a fully folded state, the parasitic branch 241 at least partially overlaps the first radiating branch 211 and the second radiating branch 221 .
  • the first middle frame 411 and the second middle frame 412 may be partially or entirely made of metal materials, and the first radiating branch 211 and the second radiating branch 221 both constitute the A part of the structure of the first middle frame 411, correspondingly, the parasitic branch 241 constitutes a part of the structure of the second middle frame 412, and the parasitic branch 241 is in a completely folded state of the electronic device 100 and the second A radial branch 211 and the second radial branch 221 at least partially overlap.
  • first middle frame 411 and the second middle frame 412 may be partly or entirely made of non-conductive material (such as glass or plastic, etc.), and the first radiating branches 211 and all The second radiating branches 221 are attached to the inner side of the first middle frame 411 , and correspondingly, the parasitic branches 241 are attached to the inner side of the second middle frame 412 .
  • the first back cover 421 and the second back cover 422 may be made of metal material, and the first radiating branch 211 and the second radiating branch 221 both constitute the first A part of the structure of the rear cover 421 , correspondingly, the parasitic branch 241 constitutes a part of the structure of the second rear cover 422 .
  • the first radiating branch 211 and the second radiating branch 221 can be cut-off metal accessories obtained by slits on the first rear cover 421, and the parasitic branch 241 can be a The cut-off metal accessories obtained by slits on the two rear covers 422 .
  • the first back cover 421 and the second back cover 422 can be made of non-conductive material (such as glass or plastic, etc.), and the first radiation branch 211 and the second radiation
  • the branches 221 are attached to the inner side of the first rear cover 421
  • the parasitic branches 241 are attached to the inner side of the second rear cover 422 .
  • the middle part of the parasitic branch 241 is opposite to the first gap G1, and the first gap G1
  • the distance from the projection of the center of G1 on the parasitic branch 241 to the middle of the parasitic branch 241 is less than or equal to one-eighth of the wavelength corresponding to the resonant frequency of the parasitic structure 24, that is, the two co-frequency antennas One-eighth of the operating wavelength.
  • the parasitic branch 241 of the parasitic structure 24 is used to couple with the radiation branch of the working antenna to form a half-wavelength mode (also referred to as One-half wavelength mode, or 1/2 ⁇ mode) resonance, in this way, two electric fields with opposite directions can be generated on both sides of the middle part of the parasitic branch 241 . That is to say, the antenna system 203 utilizes the principle that the resonance of the half-wavelength mode produces an opposite direction of the electric field at both ends of the parasitic branch 241 to cancel the coupling from one of the antennas to the other of the two same-frequency antennas. Induced electric field on.
  • a half-wavelength mode also referred to as One-half wavelength mode, or 1/2 ⁇ mode
  • the parasitic structure 24 is a wire antenna, and the wire antenna works in a half-wavelength mode.
  • the second middle frame 412 is provided with a third gap G3 and a fourth gap G4, and the third gap G3 and the fourth gap G4 connect the second middle frame 412 It is divided into sequentially adjacent fourth subsection T4, fifth subsection T5, and sixth subsection T6.
  • the fifth subsection T5 is the parasitic branch 241 of the wire antenna 24 .
  • the parasitic branch 241 is separated from the second reference ground 121 on the second main body 12 through the second slot S2, wherein, when the electronic device 100 is in a folded state , the first slot S1 is opposite to the second slot S2.
  • the parasitic branch 241 is a strip conductor, including a first radiator L1 and a second radiator L2 located on both sides of the middle of the parasitic branch 241 , the first radiator L1 and the second radiator L1
  • the two radiators L2 have an integrated structure.
  • the first radiator L1 is overlapped with the first radiation branch 211
  • the second radiator L2 is overlapped with the second radiation branch 221 .
  • the wire antenna 24 further includes a fourth matching circuit 242 and a fifth matching circuit 243 respectively coupled to both ends of the parasitic branch 241, wherein the fourth matching circuit 242 and the fifth matching circuit 243 are used to adjust the resonant frequency of the parasitic structure 24, so that the induced electric field generated by the coupling between the parasitic structure 24 and the two same-frequency antennas is generated by the two same-frequency antennas
  • the induced electric field in the same direction has a more ideal canceling effect, so as to achieve the purpose of suppressing the radiation energy on any one of the two antennas with the same frequency from being coupled to the other antenna.
  • Both the fourth matching circuit 242 and the fifth matching circuit 243 can be arranged on the second circuit board assembly 521, and can include one or more of capacitors, inductors, or switching elements, etc., and their specific circuits
  • the architecture can be set according to actual requirements, which is not specifically limited in this application.
  • the length of the parasitic branch 241 is one-half of the wavelength corresponding to the resonant frequency of the parasitic structure 24, that is, one-half of the working wavelength of the two co-frequency antennas .
  • the length of the parasitic branch 241 can be adjusted by adjusting the positions of the third gap G3 and the fourth gap G4.
  • the resonance frequency range of the half-wavelength mode can also be adjusted by adjusting the length of the parasitic branch 241 .
  • the wire antenna 24 when the wire antenna 24 is used as an active antenna, its working mode is the same or similar to the differential mode (differential mode, DM) wire antenna mode of the wire antenna introduced in Chinese patent application CN112751159A, and the specific working principle can be Please refer to the specific introduction of the DM line antenna mode of the line antenna in the Chinese patent application CN112751159A, which will not be repeated here.
  • the wire antenna 24 is used as a passive parasitic structure, and it performs magnetic field coupling feeding with the excited antenna in the two same-frequency antennas.
  • the working principle is the same as that of the wire antenna 24 as an active Antennas work similarly when used. Please refer to FIG.
  • the first radiator L1 and the second radiator of the parasitic branch 241 The direction of the induced current generated on the radiator L2 is the same; the induced electric field generated by the parasitic branch 241 in the second slot S2 between the parasitic branch 241 and the second reference ground 121 presents opposite sides on both sides of the middle part of the parasitic branch 241 .
  • directional distribution that is, the induced electric field generated in the second slot S2 between the first radiator L1 and the second reference ground 121, and the induced electric field between the second radiator L2 and the second reference ground
  • the direction of the induced electric field generated in the second slot S2 between 121 is opposite.
  • the direction of the second electric field E2 excited by the second radiating branch 221 in the first slot S1 is from the first reference ground 111 to the second radiating branch 221 (as shown in FIG. 21( b) and the orientation shown in Figure 21(c)).
  • the second radiator L2 of the parasitic branch 241 is close to the second radiation branch 221, the magnetic field lines excited around the second radiation branch 221 surround the second radiation branch 221 and the second radiation branch 221 at the same time.
  • the surface of the second radiation branch 221 is negatively charged, correspondingly, the surface of the second radiator L2 is also negatively charged, and all negatively charged
  • the second radiator L2 will induce positive charges on the second reference ground 121 near it.
  • the direction of the fourth electric field E4 formed in the second slot S2 is from the second reference ground 121 to the second radiator L2 (as shown in Figure 21(b) and Figure 21( d) in the direction shown).
  • the wire antenna 24 is excited by the second antenna 22 through magnetic field coupling, according to the principle of current and electric field distribution generated when the wire antenna 24 is excited as shown in FIG. 20 , between the first radiator L1 and the The direction of the induced current generated on the second radiator L3 is the same, and the direction of the induced electric field formed between the first radiator L1 and the second reference ground 121 is the same as that between the second radiator L2 and the The direction of the induced electric field formed between the second reference ground 121 is opposite. Therefore, at the above-mentioned first time t1, as shown in FIG. 21(d) and FIG. 21(e), the first radiator L1 and The direction of the fifth electric field E5 induced in the second slot S2 between the second reference grounds 121 is from the first radiator L1 to the second reference ground 121 .
  • the second radiation branch 221 is The direction of the first electric field E1 excited in the middle gap G0 is from the second radiator L2 of the parasitic branch 241 to the second radiator 221; since the surface of the second radiator L2 is negatively charged, The direction of the sixth electric field E6 induced by the second radiator L2 in the middle gap G0 is from the second radiator branch 221 to the second radiator L2.
  • the direction of the first electric field E1 excited by the second radiation branch 221 is opposite to that of the sixth electric field E6 induced by the second radiator L2.
  • An electric field E1 is partially or completely canceled by the sixth electric field E6, and the second radiation branch 221 is coupled to the first radiation branch 211 of the first antenna 21 through the middle gap G0 and the parasitic branch 241
  • the electric field is curtailed or eliminated.
  • the electric field induced by the first radiator L1 in the middle gap G0 is in the same direction as the first electric field E1, and the first radiator L1 is close to the first radiator L1.
  • a radiation branch 211 therefore, the remaining part of the first electric field E1 that is not canceled and the electric field induced by the first radiator L1 in the middle gap G0 are coupled to the first radiation branch 211 , wherein, the seventh electric field E7 coupled to the first radiating branch 211 is shown in FIG. 21( a ).
  • a current is induced on the first radiating branch 211 , and a third electric field E3 is formed in the first slot S1 between the first radiating branch 211 and the first reference ground 111 .
  • the first radiation branch 211 is at the first time t1, as shown in Figure 21(c) and Figure 21(e), the first radiation branch 211 is at the first
  • the direction of the third electric field E3 induced in the slot S1 is from the first reference ground 111 to the first radiation branch 211 .
  • the second radiator L2 is induced in the second slot S2
  • the direction of the fourth electric field E4 induced by the second radiating branch 221 in the first slot S1 is the same as the direction of the second electric field E2 induced by the second radiating branch 221 in the first slot S1 and the direction of the first radiating branch 211 in the first slot S1
  • the direction of the third electric field E3 induced in S1 is the same; the direction of the fifth electric field E5 induced by the first radiator L1 in the second slot S2 is the same as that of the second radiation branch 221 in the
  • the direction of the second electric field E2 induced in the first slot S1 and the direction of the third electric field E3 induced by the first radiation branch 211 in the first slot S1 are both opposite.
  • the third electric field E3 is partially or All of them will be canceled by the fifth electric field E5, so that the energy coupled from the second radiation branch 221 to the first radiation branch 211 can be reduced or eliminated.
  • the antenna system 203 provided in the third embodiment of the present application can prevent the radiated energy on any one of the two antennas with the same frequency from passing through the second reference ground on the second body.
  • 121 is coupled to the other antenna so as to effectively improve the isolation between the first antenna 21 and the second antenna 22 when the electronic device 100 is in a folded state.
  • Figure 22(a) shows that when the electronic device 100 is in the folded state and the second antenna 22 is excited, the two same-frequency antennas included in the antenna system 203 shown in Figure 19 and the first antenna on the first body 11 A simulation diagram of electric field distribution formed in the first slot S1 between the reference grounds 111 . Comparing Fig. 14(d) with Fig. 22(a), it can be seen that the electric field generated on the second antenna 22 is coupled to the first The energy on the antenna 21 is basically very little.
  • Fig. 22(b) shows a schematic diagram of the S-parameter curves of the two co-frequency antennas included in the antenna system 203 when the electronic device 100 is in a folded state. It can be seen from FIG. 22( b ) that the isolation of the two same-frequency antennas of the antenna system 203 in the working frequency band 0.8GHZ-0.9GHz is below -20dB, and the isolation is relatively high.
  • the parasitic structure 24' is a slot antenna, and the slot antenna works in a half-wavelength mode.
  • the parasitic branch 241' of the slot antenna includes a first radiator L1' and a second radiator L2' located on both sides of the middle of the parasitic branch 241', the first radiator L1' and the The second radiator L2' is spaced apart by the fifth gap G5, the end of the first radiator L1' away from the fifth gap G5 or the second radiator L2' is grounded, and the second radiator L2' One end away from the fifth gap G5 or the first radiator L1' is grounded.
  • the length of the first radiator L1' and the second radiator L2' may be a quarter of the wavelength corresponding to the resonant frequency of the parasitic structure 24, that is, the length of the working wavelength of the two co-frequency antennas a quarter.
  • the length of the first radiator L1' can be adjusted by adjusting the ground point of the first radiator L1' and the position of the fifth gap G5; the length of the first radiator L1' can be adjusted by adjusting the fifth gap G5 and the position of the grounding point of the second radiator L2' to adjust the length of the second radiator L2'.
  • the resonance frequency range of the half-wavelength mode can also be adjusted by adjusting the lengths of the first radiator L1' and the second radiator L2'.
  • the slot antenna 24' when used as an active antenna, its working mode is the same as the common mode (common mode, CM) slot antenna mode of the slot antenna introduced in the Chinese patent application CN112751159A, and the specific working principle can be found in The specific introduction of the CM slot antenna mode of the slot antenna in the Chinese patent application CN112751159A will not be repeated here.
  • the slot antenna 24' is used as a passive parasitic structure, which performs magnetic field coupling and feeding with the excited antenna of the two same-frequency antennas, and its working principle is the same as that of the slot antenna 24' as Active antennas work similarly when used. Please refer to FIG.
  • the first radiator L1' and the second The direction of the induced current generated on the radiator L2' is the same; the induced electric field generated in the second slot S2 between the first radiator L1' and the second reference ground 121 is the same as that generated in the second slot S2 The direction of the induced electric field generated in the second slot S2 between the radiator L2 ′ and the second reference ground 121 is opposite.
  • the working principle of the antenna system 203 using the slot antenna 24' as the parasitic structure is the same as the working principle of the wire antenna 24 as the parasitic structure.
  • the induced electric fields generated in two same-frequency antennas can achieve a similar cancellation effect.
  • any one or more of the first slot S1, the second slot S2, the first slot G1, the second slot G2, the third slot G3, the fourth slot G4, and the fifth slot G5 It can be filled with a non-conductive medium, for example, polycarbonate (Polycarbonate, PC) can be used for filling.
  • a non-conductive medium for example, polycarbonate (Polycarbonate, PC) can be used for filling.
  • the widths of the first slot 114, the second slot S2, the first slot G1, the second slot G2, the third slot G3, the fourth slot G4, and the fifth slot G5 can be determined according to the actual situation. It is set, and the embodiments of the present application do not limit this.
  • the antenna system 203 uses two same-frequency antennas on the same side of the foldable electronic device 100, and connects the decoupling structure 23 in series between the two same-frequency antennas.
  • the decoupling structure 23 is used to cut off the coupling path between the two same-frequency antennas passing through the first gap, which can effectively solve the problem that the two same-frequency antennas have a relatively large The problem of poor isolation.
  • the antenna system 203 also adds a 1/2 wavelength antenna structure on the other side of the electronic device 100, that is, a parasitic structure 24.
  • the parasitic structure 24 and the The two same-frequency antennas are coupled to form a half-wavelength mode resonance, wherein the induced electric field formed between the two sides of the middle of the parasitic branch 241 of the parasitic structure 24 and the second reference ground 121 near the parasitic structure 24
  • the direction is opposite, and the electric field coupled from any one of the two same-frequency antennas to the other antenna can be canceled by the induced electric field, thereby suppressing the radiated energy on any one of the two same-frequency antennas
  • the second reference ground 121 on the second body is coupled to the other antenna, thereby improving the isolation between the first antenna 21 and the second antenna 22, which can effectively solve the two problems.
  • the two same-frequency antennas have the problem of poor isolation when the electronic device 100 is in a folded state.
  • the two same-frequency antennas of the antenna system 203 have a high degree of isolation and ideal antenna performance when the electronic device 100 is in the unfolded or folded state, so that the electronic device 203 that includes the antenna system 203
  • the device 100 has a better wireless communication function.
  • the wavelength in a certain wavelength mode (such as a half-wavelength mode, a quarter-wavelength mode, etc.) of an antenna may refer to the wavelength of a signal radiated by the antenna.
  • the half-wavelength mode of the antenna can generate resonance in the 2.4GHz frequency band, wherein the wavelength in the half-wavelength mode refers to the wavelength at which the antenna radiates signals in the 2.4GHz frequency band.

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Abstract

本申请提供一种可折叠电子设备及其天线系统。天线系统包括设于第一主体的两个同频天线、串联于两个天线之间的去耦结构、设于第二主体的寄生结构。两个天线通过缝隙间隔开。折叠态时，寄生结构分别与两个天线至少部分重叠。寄生结构为1/2波长的天线结构，所述波长为两个同频天线的工作波长。在折叠态且任意一个天线工作时，寄生结构与该任意一个天线耦合形成半波长模式的谐振，在寄生结构的中部两侧与参考地之间形成反向的感应电场，以抵消从任意一个天线耦合到另一个天线上的电场，从而抑制任意一个天线上的辐射能量通过第二主体上的参考地耦合到另一个天线上。如此，可有效解决展开态和折叠态下的两个同频天线的隔离度较差的问题。

Description

可折叠电子设备及其天线系统
本申请要求于2021年12月22日提交中国专利局、申请号为2021115822348，发明名称为“可折叠电子设备及其天线系统”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及无线通信技术领域，尤其涉及一种可折叠电子设备及其天线系统。
背景技术
手机等电子设备进入智能时代后，为了获得更好的用户体验，电子设备的外观形态经历了从大屏幕到全面屏再到折叠屏的变化。这种可折叠的电子设备为天线设计带来了新的挑战，其中，当电子设备处于折叠状态时，天线在中低频段的天线性能和隔离度相对展开状态会明显变差。因此，如何解决折叠状态下天线性能和隔离度恶化的问题，成为天线设计领域要研究的重要课题。
发明内容
本申请提供一种可折叠电子设备及其天线系统，所述天线系统包含有能够形成半波长模式谐振的寄生结构，能够有效解决所述天线系统包含的两个同频天线在所述电子设备处于展开状态以及折叠状态下具有较差隔离度的问题。
第一方面，本申请提供一种天线系统，应用于可折叠电子设备中。所述可折叠电子设备包括相互连接且能够相对折叠或展开的第一主体和第二主体。所述天线系统包括两个同频天线、去耦结构以及寄生结构。所述两个同频天线设置于所述第一主体上，所述两个同频天线之间通过第一缝隙间隔开。所述去耦结构串联于所述两个同频天线之间。所述寄生结构设置于所述第二主体上，所述寄生结构在所述电子设备处于折叠状态时分别与所述两个同频天线至少部分重叠。所述寄生结构为1/2波长的天线结构，其中，所述波长为所述两个同频天线的工作波长。
本申请提供的所述天线系统通过将两个同频天线设置在可折叠的电子设备的同一侧，并在两个同频天线之间串联去耦结构，从而利用所述去耦结构来隔断所述两个同频天线之间经过所述第一缝隙的耦合路径，可以有效地解决所述两个同频天线在所述电子设备处于展开状态时具有较差隔离度的问题。所述天线系统还通过在所述电子设备的另一侧增加1/2波长的天线结构，即寄生结构，在所述电子设备处于折叠状态时，通过所述寄生结构与所述两个同频天线耦合形成半波长模式的谐振，其中，在所述寄生结构的中部两侧与所述寄生结构附近的参考地之间形成的感应电场的方向相反，通过所述感应电场可以抵消从所述两个同频天线中的任意一个天线耦合到另一个天线上的电场，从而抑制所述两个同频天线中的任意一个天线上的辐射能量通过所述第二主体上的第二参考地耦合到所述另一个天线上，进而提高所述第一天线和所述第二天线之间的隔离度，可以有效地解决所述两个同频天线在所述电子设备处于折叠状态时具有较差隔离度的问题。如此，所述天线系统的两个同频天线在所述电子设备处于展开态或折叠态时均具有较高的隔离度以及较理想的天线性能，从而使包含所述天线系统的电子设备具有较佳的无线通信功能。
在一种实施方式中，所述两个同频天线包括第一天线和第二天线，其中，所述第一天线包括第一辐射枝节，所述第二天线包括第二辐射枝节，所述第一辐射枝节和所述第二辐射枝节之间通过所述第一缝隙间隔开。所述寄生结构包括寄生枝节，其中，在所述电子设备处于完全折叠的状态时，所述寄生枝节与所述第一辐射枝节和所述第二辐射枝节重叠。
在一种实施方式中，在所述电子设备处于完全折叠的状态时，所述寄生枝节的中部与所述第一缝隙相对，并且所述第一缝隙的中心在所述寄生枝节上的投影到所述寄生枝节的中部的距离小于或等于所述两个同频天线的工作波长的八分之一。
在一种实施方式中，所述寄生枝节包括位于所述寄生枝节的中部两侧的第一辐射体和第二辐射体，其中，在所述电子设备处于折叠状态时，所述第一辐射体与所述第一辐射枝节重叠设置，所述第二辐射体与所述第二辐射枝节重叠设置。
在一种实施方式中，所述第一辐射枝节和所述第二辐射枝节分别与所述第一主体上的第一参考地通过第一槽缝间隔开，所述寄生枝节与所述第二主体上的第二参考地通过第二槽缝间隔开。其中，在所述电子设备处于折叠状态时，所述第一槽缝与第二槽缝相对。
在一种实施方式中，所述电子设备处于折叠状态且所述两个同频天线中的任意一个天线工作时，所述寄生结构与工作的天线耦合而形成半波长模式的谐振，其中，在所述第一辐射体和所述第二辐射体上产生的感应电流的方向相同；在所述第一辐射体与所述第二参考地之间的第二槽缝内产生的感应电场，与在所述第二辐射体与所述第二参考地之间的第二槽缝内产生的感应电场方向相反。
在一种实施方式中，在所述电子设备处于折叠状态且所述两个同频天线中的任意一个天线工作时，工作的天线在所述第一槽缝内激励的电场与所述两个同频天线中的另一个天线在所述第一槽缝内感应的电场为同向电场。
在一种实施方式中，所述寄生结构为线天线，所述第一辐射体和所述第二辐射体为一体结构。所述寄生枝节的长度为所述两个同频天线的工作波长的二分之一。
在一种实施方式中，所述线天线还包括分别与所述寄生枝节两端耦接的两个匹配电路，其中，所述两个匹配电路用于调整所述寄生结构的谐振频率，使所述寄生结构与所述两个同频天线相耦合而产生的感应电场与所述两个同频天线产生的感应电场具有更理想的抵消效果，从而达到抑制所述两个同频天线中的任意一个天线上的辐射能量耦合到所述另一个天线上的目的。
在一种实施方式中，所述寄生结构为槽天线，所述第一辐射体与所述第二辐射体通过缝隙间隔开，所述第一辐射体远离所述第二辐射体的一端接地，所述第二辐射体远离所述第一辐射体的一端接地。所述第一辐射体和所述第二辐射体的长度为所述两个同频天线的工作波长的四分之一。
在一种实施方式中，所述第一辐射枝节包括与所述第一缝隙相邻的第一耦合端，所述第二辐射枝节包括与所述第一缝隙相邻的第二耦合端。所述去耦结构串联于所述第一辐射枝节的第一耦合端和所述第二辐射枝节的第二耦合端之间，所述去耦结构用于隔断所述两个同频天线之间经过所述第一缝隙的耦合路径。
在一种实施方式中，所述去耦结构为带阻滤波器，所述带阻滤波器包含电感元件，或电感与电容的组合。
在一种实施方式中，所述第一天线还包括与所述第一辐射枝节耦接的第一馈电点和第一接地点，其中，所述第一馈电点到所述第一缝隙的中心的最小距离小于所述第一接地点到所 述第一缝隙的中心的最小距离。所述第二天线还包括与所述第二辐射枝节耦接的第二馈电点和第二接地点，其中，所述第二馈电点到所述第一缝隙的中心的最小距离大于所述第二接地点到所述第一缝隙的中心的最小距离。
在一种实施方式中，所述第一天线还包括与所述第一馈电点耦接的第一匹配电路，所述第一匹配电路用于实现所述第一天线的阻抗匹配，以减少信号能量损耗以及提高所述第一天线的辐射效率，使所述第一天线能够获得更理想的天线性能。所述第二天线还包括与所述第二馈电点耦接的第二匹配电路，所述第二匹配电路用于实现所述第二天线的阻抗匹配，以减少信号能量损耗以及提高所述第二天线的辐射效率，使所述第二天线能够获得更理想的天线性能。
在一种实施方式中，所述第二天线还包括与所述第二接地点耦接的第三匹配电路，所述第三匹配电路用于实现所述第二天线的阻抗匹配，以提高所述第二天线的天线性能。
在一种实施方式中，所述第一主体还包括第一中框，所述第一中框部分或全部由金属材料制成，所述第一辐射枝节与所述第二辐射枝节均构成所述第一中框的一部分结构；
所述第二主体还包括第二中框，其中，所述第一中框在所述电子设备处于完全折叠的状态时与所述第二中框重叠设置。所述第二中框部分或全部由金属材料制成，所述寄生枝节构成所述第二中框的一部分结构。
第二方面，本申请提供一种可折叠电子设备，包括第一主体、第二主体以及上述第一方面所述的天线系统。所述第一主体和所述第二主体相互连接且两者能够相对折叠或展开。所述天线系统包含的两个同频天线设置于所述第一主体上，所述天线系统包含的寄生结构设置于所述第二主体上。
在所述可折叠的电子设备中，所述天线系统通过将两个同频天线设置在可折叠的电子设备的同一侧，并在两个同频天线之间串联去耦结构，从而利用所述去耦结构来隔断所述两个同频天线之间经过所述第一缝隙的耦合路径，可以有效地解决所述两个同频天线在所述电子设备处于展开状态时具有较差隔离度的问题。所述天线系统还通过在所述电子设备的另一侧增加1/2波长的天线结构，即寄生结构，在所述电子设备处于折叠状态时，通过所述寄生结构与所述两个同频天线耦合形成半波长模式的谐振，其中，在所述寄生结构的中部两侧与所述寄生结构附近的参考地之间形成的感应电场的方向相反，通过所述感应电场可以抵消从所述两个同频天线中的任意一个天线耦合到另一个天线上的电场，从而抑制所述两个同频天线中的任意一个天线上的辐射能量通过所述第二主体上的第二参考地耦合到所述另一个天线上，进而提高所述第一天线和所述第二天线之间的隔离度，可以有效地解决所述两个同频天线在所述电子设备处于折叠状态时具有较差隔离度的问题。如此，所述天线系统的两个同频天线在所述电子设备处于展开态或折叠态时均具有较高的隔离度以及较理想的天线性能，从而使包含所述天线系统的电子设备具有较佳的无线通信功能。
附图说明
为了更清楚地说明本申请实施方式中的技术方案，下面将对本申请实施方式中所需要使用的附图作简单地介绍。显而易见地，下面描述中的附图仅仅是本申请的一些实施方式，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1为本申请的实施方式提供的可折叠的电子设备的一种结构示意图，其中，所述电子 设备处于展开状态。
图2为图1所示的电子设备处于折叠状态时的结构示意图。
图3为图1所示的电子设备的功能模块的一种结构示意图，其中，所述电子设备包括天线系统，所述天线系统至少包括两个同频天线：第一天线和第二天线。
图4为图1所示的电子设备的一种结构分解示意图。
图5为本申请第一实施方式提供的天线系统包含的两个同频天线在折叠态的电子设备的外壳上的设置位置示意图。
图6为图5所示的天线系统包含的两个同频天线在第一主体上的设置位置的俯视示意图。
图7为图5所示的天线系统的一种等效结构示意图。
图8为图7所示的天线系统包含的两个同频天线在所述电子设备处于折叠状态时的S参数曲线示意图。
图9为本申请第二实施方式提供的天线系统的一种等效结构示意图，其中，所述天线系统包含去耦结构。
图10(a)为在所述电子设备处于展开状态且第一天线激励时，图9所示的天线系统包含的两个同频天线上的电流分布仿真图。
图10(b)为在所述电子设备处于展开状态且第一天线激励时，图9所示的天线系统包含的两个同频天线上的电场分布仿真图。
图10(c)为在所述电子设备处于展开状态且第二天线激励时，图9所示的天线系统包含的两个同频天线上的电流分布仿真图。
图10(d)为在所述电子设备处于展开状态且第二天线激励时，图9所示的天线系统包含的两个同频天线上的电场分布仿真图。
图11为图9所示的天线系统包含的两个同频天线在所述电子设备处于展开状态时的S参数曲线示意图。
图12(a)为在所述电子设备处于折叠状态且第二天线激励时，图9所示的天线系统包含的两个同频天线上的电流分布仿真图。
图12(b)为在所述电子设备处于折叠状态且第二天线激励时，图9所示的天线系统包含的两个同频天线上的电场分布仿真图。
图13为图9所示的天线系统包含的两个同频天线在所述电子设备处于折叠状态时的S参数曲线示意图。
图14(a)为在所述电子设备处于折叠状态且第二天线激励时，图9所示的天线系统包含的两个同频天线与第二主体上的第二参考地之间的电场分布原理示意图。
图14(b)为图14(a)所示的结构沿I-I方向的剖视图，并示意性地示出了第二天线激励产生的电场分布方向。
图14(c)为在所述电子设备处于折叠状态且第二天线激励时，图9所示的天线系统包含的两个同频天线与第一主体上的第一参考地之间的电场分布原理示意图。
图14(d)为在所述电子设备处于折叠状态且第二天线激励时，图9所示的天线系统包含的两个同频天线与第一主体上的第一参考地之间的第一槽缝内形成的电场分布仿真图。
图15为本申请第三实施方式提供的天线系统在折叠态的电子设备上的设置位置示意图。
图16为本申请第三实施方式提供的天线系统在展开态的电子设备的外壳上的设置位置示意图，其中，所述天线系统包含寄生结构。
图17为图16所示的天线系统在折叠态的电子设备的外壳上的设置位置示意图。
图18为图16所示的天线系统包含的寄生结构在第二主体上的设置位置的俯视示意图。
图19为第三实施方式提供的天线系统的一种等效结构示意图。
图20为图19所示的寄生结构被激励时的电流和电场分布原理示意图。
图21(a)为在所述电子设备处于折叠状态且第二天线激励时，图19所示的天线系统包含的两个同频天线与所述寄生结构之间的电场分布原理示意图。
图21(b)为图21(a)所示的结构沿II-II方向的部分剖视图，并示意性地示出了所述第二天线激励产生的电场分布方向，以及所述寄生结构感应出的电场分布方向。
图21(c)为在所述电子设备处于折叠状态且第二天线激励时，图19所示的天线系统包含的两个同频天线与第一主体上的第一参考地之间的电场分布原理示意图。
图21(d)为在所述电子设备处于折叠状态且第二天线激励时，图19所示的天线系统包含的寄生结构与第二主体上的第二参考地之间的电场分布原理示意图。
图21(e)为图21(a)所示的结构沿III-III方向的部分剖视图，并示意性地示出了所述第一天线和所述寄生结构分别感应出的电场分布方向。
图22(a)为在所述电子设备处于折叠状态且第二天线激励时，图19所示的天线系统包含的两个同频天线与第一主体上的第一参考地之间的第一槽缝内形成的电场分布仿真图。
图22(b)为图19所示的天线系统包含的两个同频天线在所述电子设备处于折叠状态时的S参数曲线示意图。
图23为第三实施方式提供的天线系统的另一种等效结构示意图。
图24为图23所示的天线系统包含的寄生结构在第二主体上的设置位置的俯视示意图。
图25为图23所示的寄生结构被激励时的电流和电场分布原理示意图。
主要元件符号说明
电子设备 100
第一主体 11
第一参考地 111
第二主体 12
第二参考地 121
连接部 13
显示屏 14
第一显示屏 141
第二显示屏 142
天线系统 200、201、202、203
天线 20
第一天线 21
第一辐射枝节 211
第一馈电点 212
第一接地点 213
第一馈电枝节 214
第一接地枝节 215
第一匹配电路 216
第一耦合端 217
第二天线 22
第二辐射枝节 221
第二馈电点 222
第二接地点 223
第二馈电枝节 224
第二接地枝节 225
第二匹配电路 226
第三匹配电路 227
第二耦合端 228
去耦结构 23
寄生结构 24、24’
线天线 24
槽天线 24’
寄生枝节 241、241’
第一辐射体 L1、L1’
第二辐射体 L2、L2’
第四匹配电路 242
第五匹配电路 243
射频模块 25
处理器 31
存储器 32
电源模块 33
其他输入输出设备 34
外壳 40
中框 41
第一中框 411
第一子段 T1
第二子段 T2
第三子段 T3
第二中框 412
第四子段 T4
第五子段 T5
第六子段 T6
后盖 42
第一后盖 421
第二后盖 422
内部结构 50
第一电路板组件 511
第一电池单元 512
第二电路板组件 521
第二电池单元 522
中间缝隙 G0
第一缝隙 G1
第二缝隙 G2
第三缝隙 G3
第四缝隙 G4
第五缝隙 G5
第一槽缝 S1
第二槽缝 S2
第一耦合路径 P1
第二耦合路径 P2
第一边缘区域 A
第二边缘区域 B
第一电场 E1
第二电场 E2
第三电场 E3
第四电场 E4
第五电场 E5
第六电场 E6
第七电场 E7
如下具体实施方式将结合上述附图进一步说明本申请。
具体实施方式
下面将结合本申请实施方式中的附图，对本申请实施方式中的技术方案进行清楚、完整地描述。其中，附图仅用于示例性说明，表示的仅是示意图，不能理解为对本申请的限制。显然，所描述的实施方式仅仅是本申请一部分实施方式，而不是全部的实施方式。基于本申请中的实施方式，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施方式，都属于本申请保护的范围。
除非另有定义，本申请所使用的所有的技术和科学术语与本领域技术人员通常理解的含义相同。本申请在说明书中所使用的术语只是为了描述具体实施方式的目的，不是旨在限制本申请。
本申请提供一种可折叠的电子设备，所述电子设备包括可相对折叠或展开的第一主体和第二主体、以及天线系统。所述天线系统包括设于所述第一主体上的两个同频天线、串联于所述两个同频天线之间的去耦结构、以及设于所述第二主体上的寄生结构。其中，所述两个同频天线通过第一缝隙间隔开。所述寄生结构在所述电子设备处于折叠状态时分别与所述两个同频天线至少部分重叠。所述去耦结构串联于所述两个同频天线之间，所述天线系统利用所述去耦结构来隔断所述两个同频天线之间经过所述第一缝隙的耦合路径，从而可以有效地 解决所述两个同频天线在所述电子设备处于展开状态时具有较差隔离度的问题。所述寄生结构为1/2波长的天线结构，其中，所述波长为所述两个同频天线的工作波长。其中，在所述电子设备处于折叠状态且所述两个同频天线中的任意一个天线工作时，所述天线系统利用所述寄生结构与工作的天线耦合而形成半波长模式的谐振，其中，在所述寄生结构的中部两侧与所述寄生结构附近的参考地之间形成的感应电场的方向相反，所述感应电场用于抵消从工作的天线耦合到所述两个同频天线中的另一个天线上的电场，从而抑制所述两个同频天线中的任意一个天线上的辐射能量通过所述第二主体上的第二参考地耦合到所述另一个天线上，进而提高所述第一天线和所述第二天线之间的隔离度，可以有效地解决所述两个同频天线在所述电子设备处于折叠状态时具有较差隔离度的问题。如此，所述天线系统的两个同频天线在所述电子设备处于展开态或折叠态时均具有较高的隔离度以及较理想的天线性能，从而使包含所述天线系统的电子设备具有较佳的无线通信功能。
图1-图2示出了本申请的实施方式提供的可折叠的电子设备100的一种结构示意图。其中，所述电子设备100包括但不限于手机、平板电脑、可穿戴式设备等电子装置。
如图1-图2所示，所述电子设备100包括相互连接的第一主体11和第二主体12。在本实施方式中，所述电子设备100还包括设于所述第一主体11与所述第二主体12之间的连接部13，所述第一主体11与所述第二主体12通过所述连接部13进行连接，并且两者能够通过所述连接部13相对折叠或展开，使所述电子设备100能够具有两种使用模式，其中，图1示出了所述电子设备100处于展开状态的使用模式时的结构示意图，图2示出了所述电子设备100处于折叠状态的使用模式时的结构示意图。如图2所示，当所述电子设备100处于折叠状态时，在所述第一主体11与所述第二主体12之间形成中间缝隙G0。
所述电子设备100在所述第一主体11和所述第二主体12之间的连接部13上还可设有连接结构(图未示)，例如转轴或铰链结构等，所述第一主体11与所述第二主体12通过所述连接结构连接，并且两者可通过所述连接结构发生转动，从而使两者能够在相对折叠的状态和相对展开的状态之间进行切换。
在本实施方式中，所述电子设备100还包括设置于所述第一主体11和所述第二主体12上的显示屏14，所述显示屏14用于将可视输出显示给用户，所述可视输出可以包括图形、文本、图标、视频等。所述显示屏14可包括第一显示屏141和第二显示屏142，其中，所述第一显示屏141可设置于所述第一主体11上，所述第二显示屏142可设置于所述第二主体12上。可选地，所述第一显示屏141和所述第二显示屏142中的其中一个显示屏可设置为主屏，另一个显示屏可设置为副屏。
在一种实施方式中，所述第一显示屏141和所述第二显示屏142相互耦接，使所述显示屏14能够连续地设置于所述第一主体11和所述第二主体12的同一侧，如此，所述第一显示屏141与所述第二显示屏142在所述电子设备100处于完全展开的状态时能够形成一个完整的平面，从而使得所述电子设备100在展开状态时具有连续的大面积显示屏，以实现大屏幕显示的功能，能够满足用户的大屏幕显示的使用需求。所述电子设备100在处于折叠状态时具有小面积显示屏，能够满足用户的便于携带的使用需求。
其中，所述显示屏14可为柔性屏。所述显示屏14在所述电子设备100处于折叠状态时可隐藏在所述电子设备100的内侧，也可暴露在所述电子设备100的外侧，本申请对所述显示屏14的类型以及所述显示屏14在所述电子设备100处于折叠状态时的呈现方式不作限定。图2中以所述显示屏14在所述电子设备100处于折叠状态时暴露在所述电子设备100的外侧 为例进行示意。
图3示出了所述电子设备100的功能模块的一种结构示意图。如图3所示，除了所述显示屏14之外，所述电子设备100还可包括处理器31、存储器32、电源模块33以及其他输入输出设备34。
其中，所述处理器31作为所述电子设备100的逻辑运算和控制中心，主要负责数据采集、数据转换、数据处理、逻辑运算、通信及执行驱动输出等功能。所述处理器31可包括多个输入输出端口，所述处理器31可通过所述多个输入输出端口与其他功能模块或外部设备进行通信以及信息交互，从而可实现所述电子设备100的驱动和控制等功能。
所述存储器32可以被所述处理器31或外设接口(图未示)等访问，以实现数据的存储或调用等。所述存储器32可以包括高速随机存取存储器，还可以包括非易失性存储器，例如一个或多个磁盘存储器件、闪存器件、或其他易失性固态存储器件。
所述电源模块33用于为所述电子设备100的其他功能模块供电以及进行电源管理，使所述电子设备100的其他功能模块能够正常工作。
所述其他输入输出设备34可包括用于实现所述电子设备100所支持的功能的设备，例如扬声器、触摸板、摄像头、功能按键、I/O口等，从而可实现所述电子设备100与用户的交互。
在本实施方式中，所述电子设备100还具有无线通信功能，相应地，所述电子设备100还包括天线系统200，所述天线系统200至少包括天线20和射频模块25，其中，所述天线20可通过传输元件(图未示)，例如同轴线缆或微带线耦接到所述射频模块25，以实现无线信号的传输，从而建立所述电子设备100与其他网络设备的通信。在所述电子设备100中，为了满足用户对各种无线通信技术的使用需求，所述天线20通常包括多个天线单元，各个天线单元可用于覆盖单个或多个通信频带，不同的天线单元还可复用，以提高天线的利用率。所述多个天线单元可分布在所述第一主体11和/或所述第二主体12上，且天线形式可以是多样的，例如可为单极子(monopole)天线、偶极子(dipole)天线、倒F天线(inverted F-shaped antenna,IFA)、左手天线等形式。
可以理解的是，所述电子设备100还可包括设置于所述第一主体11和/或所述第二主体12内部的电路板组件(图未示)，所述电路板组件用于设置所述电子设备100包含的电子元器件，例如所述射频模块25、处理器31、存储器32等。其中，所述电路板组件可为柔性电路板组件或软硬结合电路板组件。
图4示出了所述电子设备100的一种结构分解示意图。如图4所示，所述电子设备100至少包括显示屏14、外壳40、以及收容在由所述显示屏14和所述外壳40围设成的收容腔内的内部结构50。
具体地，所述外壳40包括中框41和后盖42，所述中框41至少与所述后盖42的边缘区域连接。其中，所述中框41包括对应于第一主体11的第一中框411和对应于所述第二主体12的第二中框412。所述后盖42包括对应于第一主体11的第一后盖421和对应于所述第二主体12的第二后盖422。所述第一中框411和所述第一后盖421构成的整体，与所述第二中框412和所述第二后盖422构成的整体可通过所述连接部13进行连接。
请一并参阅图4-图5，所述电子设备100处于完全折叠的状态时，所述第一主体11和所述第二主体12重叠设置，使得所述第一中框411和所述第二中框412重叠设置，所述第一后盖421和所述第二后盖422重叠设置。所述天线20可设于所述中框41和/或所述后盖上。
请再次参阅图4，在本实施方式中，所述内部结构50包括但不限于对应于所述第一主体 11的第一电路板组件511和第一电池单元512，以及对应于所述第二主体12的第二电路板组件521和第二电池单元522。其中，所述第一电路板组件511用于设置所述第一主体11包含的电子元器件，所述第二电路板组件521用于设置所述第二主体12包含的电子元器件，所述第一电池单元512和所述第二电池单元522用于为设置于所述第一主体11和/或所述第二主体12上的电子元器件供电。在另一种实施方式中，所述电子设备100也可以包含一个电池单元或两个以上的电池单元。
可以理解的是，图3和图4所示的电子设备100仅仅是所述电子设备的一个示例，并且所述电子设备100可以具有比图3和图4中所示出的更多的或者更少的部件，可以组合两个或更多的部件，或者可以具有不同的部件配置。
请再次参阅图3，在本实施方式中，所述天线系统200至少包括第一天线21和第二天线22，其中，所述第一天线21和所述第二天线22为两个同频天线，所述第一天线21和所述第二天线22设置于所述电子设备100的边缘区域，例如设置于所述中框41上或设置于所述后盖42靠近所述中框41的部位。本申请中以所述第一天线21和所述第二天线22均设置于所述第一主体11的第一边缘区域A(如图1所示)中为例，对所述天线系统200的结构进行介绍。
图4-图5示出了第一实施方式的天线系统201包含的两个同频天线在所述电子设备100的外壳40上的设置位置示意图。如图4-图5所示，所述第一天线21和所述第二天线22均设置于所述第一主体11对应的第一中框411上，且所述第一天线21和所述第二天线22之间通过第一缝隙G1间隔开。
具体地，所述第一天线21包括第一辐射枝节211，所述第二天线22包括第二辐射枝节221，所述第一辐射枝节211和所述第二辐射枝节221之间通过所述第一缝隙G1间隔开。
在所述第一实施方式中，所述第一中框411可部分或全部由金属材料制成，所述第一辐射枝节211与所述第二辐射枝节221均构成所述第一中框411的一部分结构。
可选地，在其他实施方式中，所述第一中框411可部分或全部由非导电材料(例如玻璃或塑料等)制成，所述第一辐射枝节211与所述第二辐射枝节221均贴设于所述第一中框411的内侧。
可选地，在其他实施方式中，所述第一后盖421可由金属材料制成，所述第一辐射枝节211与所述第二辐射枝节221均构成所述第一后盖421的一部分结构。例如，所述第一辐射枝节211与所述第二辐射枝节221可为在所述第一后盖421上开缝而获得的被隔断的金属附件。
可选地，在其他实施方式中，所述第一后盖421可由非导电材料(例如玻璃或塑料等)制成，所述第一辐射枝节211与所述第二辐射枝节221均贴设于所述第一后盖421的内侧。
请一并参阅图4和图6，在所述第一实施方式中，所述第一天线21还包括与所述第一辐射枝节211耦接的第一馈电点212和第一接地点213，所述第二天线22还包括与所述第二辐射枝节221耦接的第二馈电点222和第二接地点223。
所述第一中框411上开设有所述第一缝隙G1和第二缝隙G2，所述第一缝隙G1与所述第二缝隙G2将所述第一中框411分割成依次相邻的第一子段T1、第二子段T2、和第三子段T3。
所述第一子段T1分别与所述第一馈电点212以及所述第一接地点213耦接，其中，所述第一馈电点212到所述第一缝隙G1的中心的最小距离小于所述第一接地点213到所述第一 缝隙G1的中心的最小距离，所述第一子段T1与所述第一接地点213的耦接之处至所述第一缝隙G1之间的金属段为所述第一辐射枝节211。
所述第二子段T2分别与所述第二馈电点222以及所述第二接地点223耦接，其中，所述第二馈电点222到所述第一缝隙G1的中心的最小距离大于所述第二接地点223到所述第一缝隙G1的中心的最小距离，所述第二子段T2为所述第二辐射枝节221。
所述第一辐射枝节211和所述第二辐射枝节221还分别与所述第一主体11上的第一参考地111通过第一槽缝S1间隔开。其中，所述第一参考地111为由所述第一主体11上的若干个金属部件，例如所述第一中框411包含的除所述第一辐射枝节211和所述第二辐射枝节221之外的其他金属结构、所述第一电路板组件511的接地层、所述第一后盖421包含的金属结构、所述第一电池单元512包含的金属结构等构成的组合。为了方便在图中示意以及便于理解，本申请中以完整的、且具有一定厚度的块状等效结构来表示所述第一参考地111。
在所述第一实施方式中，所述第一馈电点212可通过连接件(图未示)与所述射频模块25包含的第一射频模块(图未示)耦接，例如，所述连接件可包括位于所述第一电路板组件511上的弹性部件以及微带线，所述弹性部件通过微带线与所述第一射频模块耦接。所述第一辐射枝节211通过所述第一接地点213接地，以及通过所述第一馈电点212与所述第一射频模块耦接。所述第一辐射枝节211通过所述第一馈电点212接收所述第一射频模块输入的内部电磁波信号，并将所述内部电磁波信号辐射到外部。所述第一辐射枝节211还用于接收外部电磁波信号，并通过所述第一馈电点212将所述外部电磁波信号传输给所述第一射频模块，再由所述处理器31对所述外部电磁波信号进行相应的信号处理，从而能够通过所述第一天线21实现所述电子设备100与外部设备之间的无线通信。
同样地，所述第二馈电点222可通过连接件(图未示)与所述射频模块25包含的第二射频模块(图未示)耦接。所述第二辐射枝节221通过所述第二接地点223接地，以及通过所述第二馈电点222与所述第二射频模块耦接。所述第二天线22的工作原理与所述第一天线21的工作原理相同，在此不重复赘述。
在折叠状态下，如图7所示，所述第二主体12上的第二参考地121靠近所述第一辐射枝节211和所述第二辐射枝节221。其中，所述第二参考地121为由所述第二主体12上的若干个金属部件，例如所述第二中框412包含的金属结构、所述第二电路板组件521的接地层、所述第二后盖422包含的金属结构、所述第二电池单元522包含的金属结构等构成的组合。为了方便在图中示意以及便于理解，本申请文中以完整的、且具有一定厚度的块状等效结构来表示所述第二参考地121。
在所述第一实施方式中，所述第一辐射枝节211上还可延伸出与所述第一馈电点212耦接的第一馈电枝节214以及与所述第一接地点213耦接的第一接地枝节215。同样地，所述第二辐射枝节221上也可延伸出与所述第二馈电点222耦接的第二馈电枝节224以及与所述第二接地点223耦接的第二接地枝节225。
可选地，在另一种实施方式中，所述第一馈电点212与所述第一接地点213可直接设置于所述第一辐射枝节211上，所述第二馈电点222与所述第二接地点223可直接设置于所述第二辐射枝节221上。
所述第一天线21还包括与所述第一馈电点212耦接的第一匹配电路216，所述第一匹配电路216用于实现所述第一天线21的阻抗匹配，以减少信号能量损耗以及提高所述第一天线21的辐射效率，使所述第一天线21能够获得更理想的天线性能。所述第二天线22还包括与 所述第二馈电点222耦接的第二匹配电路226，所述第二匹配电路226用于实现所述第二天线22的阻抗匹配，以减少信号能量损耗以及提高所述第二天线22的辐射效率，使所述第二天线22能够获得更理想的天线性能。
可选地，所述第二天线22还可包括与所述第二接地点223耦接的第三匹配电路227，所述第三匹配电路227用于更加灵活地实现所述第二天线22的阻抗匹配，以提高所述第二天线22的天线性能。
其中，所述第一匹配电路216、所述第二匹配电路226、所述第三匹配电路227均可设置于所述第一电路板组件511上。各个匹配电路可包含电容、电感或开关元件等中的一个或多个，其具体的电路架构可根据实际需求设定，本申请对此不进行具体限定。
在所述第一实施方式中，所述第一天线21和所述第二天线22均用于提供谐振。具体地，当所述第一馈电点212给所述第一辐射枝节211馈电时，第一辐射枝节211能够激励射频电磁场，向空间辐射电磁波，形成相应的谐振。同样的，当所述第二馈电点222给所述第二辐射枝节221馈电时，第二辐射枝节221能够激励射频电磁场，向空间辐射电磁波，形成相应的谐振。
在所述第一实施方式中，所述第一天线21和所述第二天线22可为低频段天线(600MHz至960MHz)，例如LTE B28(703MHz至803MHz)、LTE B5(824MHz至894MHz)、LTE B8(880MHz至960MHz)等。
如图7所示，由于所述第一天线21与所述第二天线22之间存在所述第一缝隙G1，当任意一个天线工作时，两个天线相对的端部形成一个“电容器”，在所述第一天线21与所述第二天线22之间会形成经过所述第一辐射枝节211、所述第一缝隙G1和所述第二辐射枝节221的第一耦合路径P1，使得所述第一天线21与所述第二天线22之间会通过所述第一耦合路径P1发生电场耦合。当所述第一天线21与所述第二天线22工作在同一频段时，会导致所述第一天线21与所述第二天线22之间的隔离度在所述电子设备100处于展开态或折叠态时均较低，从而影响两个同频天线的工作性能和辐射效率。
图8示出了第一实施方式的所述天线系统201包含的两个同频天线在所述电子设备100处于折叠状态时的S参数曲线示意图。从图8中的曲线S21可看出，所述天线系统201的两个同频天线在工作频段0.8GHZ-0.95GHz的隔离度为-5dB左右，隔离度较差。
为了提高所述第一天线21与所述第二天线22这两个同频天线之间的隔离度，如图9所示，本申请还提供了第二实施方式的天线系统202。其中，所述第二实施方式提供的所述天线系统202的结构与图7所示的天线系统201的结构相似，不同之处在于：所述第二实施方式提供的所述天线系统202还包括串联于所述两个同频天线之间的去耦结构23，所述去耦结构23用于隔断所述两个同频天线之间经过所述第一缝隙G1的所述第一耦合路径P1，使所述第一天线21与所述第二天线22无法通过所述第一耦合路径P1进行耦合。
具体地，所述第一辐射枝节211还包括与所述第一缝隙G1相邻的第一耦合端217，所述第二辐射枝节221还包括与所述第一缝隙G1相邻的第二耦合端228。所述去耦结构23串联于所述第一辐射枝节211的第一耦合端217和所述第二辐射枝节221的第二耦合端228之间，如此，所述去耦结构23能够用于隔断所述第一天线21与所述第二天线22之间的所述第一耦合路径P1。
在所述第二实施方式中，所述去耦结构23为带阻滤波器，其中，所述带阻滤波器可包含电感元件，或电感与电容的组合。
在一种实施方式中，所述去耦结构23可设置于所述第一电路板组件511上。在其他实施方式中，所述去耦结构23可设于所述第一缝隙G1内。
以所述带阻滤波器包含电感元件为例，当所述电子设备100处于展开状态时，通过调整所述电感元件的电感值，可以隔断所述第一天线21与所述第二天线22之间的所述第一耦合路径P1，从而使所述第一天线21与所述第二天线22之间具有较高的隔离度。其中，所述电感元件的电感值范围在3nH-300nH之间。
图10(a)示出了在所述电子设备100处于展开状态且所述第一天线21激励时，图9所示的天线系统202包含的两个同频天线上的电流分布仿真图。图10(b)示出了在所述电子设备100处于展开状态且所述第一天线21激励时，图9所示的天线系统202包含的两个同频天线上的电场分布仿真图。从图10(a)-图10(b)中可看出，在所述天线系统202采用了所述去耦结构23之后，当所述电子设备100处于展开状态且所述第一天线21激励时，在所述第一天线21上激励的电流和电场基本上不会耦合到所述第二天线22上。
同样的，图10(c)示出了在所述电子设备100处于展开状态且所述第二天线22激励时，图9所示的天线系统202包含的两个同频天线上的电流分布仿真图。图10(d)示出了在所述电子设备100处于展开状态且所述第二天线22激励时，图9所示的天线系统202包含的两个同频天线上的电场分布仿真图。从图10(c)-图10(d)中可看出，在所述天线系统202采用了所述去耦结构23之后，当所述电子设备100处于展开状态且所述第二天线22激励时，在所述第二天线22上激励的电流和电场基本上不会耦合到所述第一天线21上。
图11为图9所示的天线系统202包含的两个同频天线在所述电子设备100处于展开状态时的S参数曲线示意图。从图11中的曲线S21可看出，当所述电子设备100处于展开状态时，所述天线系统202的两个同频天线在工作频段0.8GHZ-1GHz的隔离度为-20dB左右，隔离度较高。
图12(a)示出了在所述电子设备100处于折叠状态且所述第二天线22激励时，图9所示的天线系统202包含的两个同频天线上的电流分布仿真图。从图12(a)中可看出，当所述电子设备100处于折叠状态且所述第二天线22激励时，尽管所述天线系统202包含了所述去耦结构23，在所述第二天线22上激励的电流仍然会耦合到所述第一天线21上。同样的，在所述第一天线21激励时，在所述第一天线21上激励的电流也会耦合到所述第二天线22上。
图12(b)示出了在所述电子设备100处于折叠状态且所述第二天线22激励时，图9所示的天线系统202包含的两个同频天线上的电场分布仿真图。从图12(b)中可看出，当所述电子设备100处于折叠状态且所述第二天线22激励时，尽管所述天线系统202包含了所述去耦结构23，在所述第二天线22上激励的电场仍然会耦合到所述第一天线21上。同样的，在所述第一天线21激励时，在所述第一天线21上激励的电场也会耦合到所述第二天线22上。
图13为图9所示的天线系统202包含的两个同频天线在所述电子设备100处于折叠状态时的S参数曲线示意图。从图13中的曲线S21可看出，当所述电子设备100处于折叠状态时，所述天线系统202的两个同频天线在工作频率为0.96GHz附近时的隔离度为-12dB左右，隔离度依然较差。
可见，在所述第一辐射枝节211和所述第二辐射枝节221之间串联所述去耦结构23，即包含电感元件的带阻滤波器，只能隔断展开状态下的所述第一天线21与所述第二天线22之间的电流和电场耦合，但并不能隔断折叠状态下的所述第一天线21与所述第二天线22之间的电流和电场耦合。当所述电子设备100处于折叠状态时，所述第一天线21与所述第二天线 22之间依然会发生电流和电场耦合，导致两者之间的隔离度依然较低，影响两个同频天线的工作性能和辐射效率。
基于图12(a)-图12(b)所示的仿真结果，下面对图9所示的天线系统202包含的两个同频天线的耦合原理进行分析。
请一并参阅图14(a)和图14(b)，以激励所述第二天线22为例，在所述电子设备100处于折叠状态下，当所述第二馈电点222给所述第二辐射枝节221馈电时，在所述第二辐射枝节221上会激励出电流，在所述第二辐射枝节221的周围会激励出电场。
由于所述第二主体12上的金属体，即所述第二参考地121靠近所述第一主体11上的第二辐射枝节221，因此，所述第二辐射枝节221上的激励电流在所述第二辐射枝节221附近第二参考地121上会感应出电动势。如此，如图14(a)和图14(b)所示，在所述第二辐射枝节221与所述第二参考地121之间的中间缝隙G0内会形成第一电场E1。这里也可以理解为，在所述电子设备100处于折叠状态时，由于所述第二参考地121靠近所述第二辐射枝节221，且在两者之间形成所述中间缝隙G0，因此，所述第二辐射枝节221与所述第二参考地121形成“电容器”，在两者之间能够形成所述第一电场E1。
与此同时，由于所述第一主体11上的金属体，即所述第一参考地111靠近所述第二辐射枝节221，且在两者之间存在第一槽缝S1，因此，所述第二辐射枝节221上的激励电流在所述第二辐射枝节221附近的第一参考地111上也会感应出电动势。如此，如图14(b)和图14(c)所示，在所述第二辐射枝节221与所述第一参考地111之间的第一槽缝S1内会形成第二电场E2。
另外，如图14(a)所示，所述第一电场E1还通过所述中间缝隙G0以及所述第二参考地121耦合到所述第一天线21的第一辐射枝节211上，因此，在所述第一辐射枝节211上会感应出电流。由于所述第一参考地111靠近所述第一辐射枝节211，且在两者之间存在所述第一槽缝S1，因此，所述第一辐射枝节211上的感应电流在所述第一辐射枝节211附近的第一参考地111上会感应出电动势。如此，如图14(c)所示，在所述第一辐射枝节211与所述第一参考地111之间的第一槽缝S1内会形成第三电场E3。
请一并参阅图14(a)-图14(c)，在第一时刻t1，若所述第二辐射枝节221表面带负电荷，则带负电荷的所述第二辐射枝节221会在其附近的所述第二参考地121和所述第一参考地111上均感应出正电荷。此时，在所述中间缝隙G0内形成的所述第一电场E1的方向为从所述第二参考地121指向所述第二辐射枝节221(如图14(a)和图14(b)所示的方向)，在所述第一槽缝S1内形成的所述第二电场E2的方向为从所述第一参考地111指向所述第二辐射枝节221(如图14(b)和图14(c)所示的方向)。同时，带正电荷的所述第二参考地121会在所述第一辐射枝节211上感应出负电荷，如此，在所述第一槽缝S1内形成的所述第三电场E3的方向为从所述第一参考地111指向所述第一辐射枝节211(如图14(c)所示的方向)。
可以理解的是，在第二时刻t2，若所述第二辐射枝节221表面带正电荷，则所述第一电场E1、第二电场E2、第三电场E3的方向均会反向，即，在所述中间缝隙G0内形成的所述第一电场E1的方向为从所述第二辐射枝节221指向所述第二参考地121、在所述第一槽缝S1内形成的所述第二电场E2的方向为从所述第二辐射枝节221指向所述第一参考地111、在所述第一槽缝S1内的所述第三电场E3的方向为从所述第一辐射枝节211指向所述第一参考地111。
本领域的技术人员可以理解的是，激励所述第一天线21所形成的电场的原理与激励所述第二天线22所形成的电场的原理相同，具体技术细节请参阅上文对激励所述第二天线22的相关具体介绍，在此不进行重复赘述。
根据以上分析以及图14(a)-图14(c)所示的原理图可知，当所述电子设备100处于折叠状态时，尽管所述天线系统202包含了所述去耦结构23，但激励其中一个天线所产生的电场会通过所述第二主体12上的第二参考地121耦合到另一个天线上，因此，所述第一天线21与所述第二天线22之间会通过所述第二参考地121发生电场耦合。也就是说，所述第二主体12上的第二参考地121为所述第一主体11和所述第二主体12提供了一条第二耦合路径P2(如图14(a)所示)，所述第二耦合路径P2经过所述第一辐射枝节211、所述中间缝隙G0、所述第二参考地121、以及所述第二辐射枝节221。如此，所述第一天线21与所述第二天线22之间能够通过所述第二耦合路径P2发生电场耦合，从而导致所述第一天线21与所述第二天线22在所述电子设备100处于折叠状态时具有较低的隔离度，影响两个同频天线的工作性能和辐射效率。
图14(d)示出了在所述电子设备100处于折叠状态且第二天线22激励时，图9所示的天线系统202包含的两个同频天线与第一主体11上的第一参考地111之间的第一槽缝S1内形成的电场分布仿真图。从图14(d)中可看出，所述第二天线22产生的电场的很大一部分能量被耦合到所述第一天线21上。另外，如图14(c)和图14(d)所示，在同一时刻，所述第二电场E2与所述第三电场E3的方向相同，即，在第一槽缝S1中，所述第二天线22激励的第二电场E2与所述第一天线21感应的第三电场E3为同向电场。
为了解决可折叠的所述电子设备100在折叠状态下所述第一天线21与所述第二天线22这两个同频天线之间的隔离度较低的问题，本申请还提供了第三实施方式的天线系统203。
图15示出了所述天线系统203在折叠态的电子设备100上的设置位置示意图。图16-图17示出了第三实施方式的天线系统203在所述电子设备100的外壳40上的设置位置示意图。如图16-图17所示，所述第三实施方式的天线系统203的结构与第二实施方式的天线系统202的结构相似，不同之处在于：所述第三实施方式的天线系统203还包括设置于所述电子设备100的另一个主体上的寄生结构24，且所述寄生结构24在所述电子设备100处于折叠状态时，分别与所述两个同频天线至少部分重叠。
在所述第三实施方式中，所述寄生结构24为在被激励时能够在所述寄生枝节241的中部两侧与所述第二参考地之间形成反向电场的天线结构。
具体地，所述寄生结构24为1/2波长的天线结构，工作在半波长模式，其中，所述波长为所述两个同频天线的工作波长。在所述电子设备100处于折叠状态且所述两个同频天线中的任意一个天线工作/激励时，所述寄生结构24用于与工作的天线耦合而形成半波长模式的谐振，其中，在所述寄生结构24的中部两侧与所述寄生结构24附近的第二参考地121之间形成的感应电场的方向相反，所述感应电场用于抵消从所述工作的天线耦合到所述两个同频天线中的另一个天线上的电场，以抑制所述两个同频天线中的任意一个天线上的辐射能量通过所述第二主体上的第二参考地121耦合到所述另一个天线上，从而提高所述第一天线21和所述第二天线22之间的隔离度。
具体地，在所述第三实施方式中，如图15所示，所述第一天线21和所述第二天线22设置于所述电子设备100的其中一个主体，例如第一主体11的第一边缘区域A中，所述寄生结构24设置于所述电子设备100的另一个主体，例如第二主体12的第二边缘区域B中，其 中，所述第一边缘区域A和第二边缘区域B可为所述中框41上的部位或为所述后盖42靠近所述中框41的部位。所述第一边缘区域A和所述第二边缘区域B在所述电子设备100处于折叠状态时重叠设置。
在一种实施方式中，所述第一天线21和所述第二天线22可设置于所述第一中框411上，相应地，所述寄生结构24可设置于所述第二中框412上。在另一种实施方式中，所述第一天线21和所述第二天线22可设置于所述第一后盖421靠近所述第一中框411的部位，相应地，所述寄生结构24可设置于所述第二后盖422靠近所述第二中框412的部位。如图16-图17所示，本申请中以所述两个同频天线均设置于所述第一主体11的第一中框411上、所述寄生结构24设置于所述第二主体12的第二中框412上为例，对所述天线系统203的结构进行介绍。
所述寄生结构24包括寄生枝节241，其中，在所述电子设备100处于完全折叠的状态时，所述寄生枝节241与所述第一辐射枝节211和所述第二辐射枝节221至少部分重叠。
在所述第三实施方式中，所述第一中框411和第二中框412可部分或全部由金属材料制成，所述第一辐射枝节211与所述第二辐射枝节221均构成所述第一中框411的一部分结构，相应地，所述寄生枝节241构成所述第二中框412的一部分结构，所述寄生枝节241在所述电子设备100处于完全折叠的状态与所述第一辐射枝节211和所述第二辐射枝节221至少部分重叠。
可选地，在其他实施方式中，所述第一中框411和第二中框412可部分或全部由非导电材料(例如玻璃或塑料等)制成，所述第一辐射枝节211与所述第二辐射枝节221均贴设于所述第一中框411的内侧，相应地，所述寄生枝节241贴设于所述第二中框412的内侧。
可选地，在其他实施方式中，所述第一后盖421和第二后盖422可由金属材料制成，所述第一辐射枝节211与所述第二辐射枝节221均构成所述第一后盖421的一部分结构，相应地，所述寄生枝节241构成所述第二后盖422的一部分结构。例如，所述第一辐射枝节211与所述第二辐射枝节221可为在所述第一后盖421上开缝而获得的被隔断的金属附件，所述寄生枝节241可为在所述第二后盖422上开缝而获得的被隔断的金属附件。
可选地，在其他实施方式中，所述第一后盖421和第二后盖422可由非导电材料(例如玻璃或塑料等)制成，所述第一辐射枝节211与所述第二辐射枝节221均贴设于所述第一后盖421的内侧，相应地，所述寄生枝节241贴设于所述第二后盖422的内侧。
在所述第三实施方式中，如图17所示，在所述电子设备100处于完全折叠的状态时，所述寄生枝节241的中部与所述第一缝隙G1相对，并且所述第一缝隙G1的中心在所述寄生枝节241上的投影到所述寄生枝节241的中部的距离小于或等于所述寄生结构24的谐振频率对应的波长的八分之一，即所述两个同频天线的工作波长的八分之一。
当所述第一天线21和所述第二天线22中的任意一个天线工作时，所述寄生结构24的寄生枝节241用于与工作的天线的辐射枝节耦合形成半波长模式(也可称为二分之一波长模式，或1/2λ模式)的谐振，如此，在所述寄生枝节241的中部两侧能够产生方向相反的两个电场。也就是说，所述天线系统203利用半波长模式的谐振在所述寄生枝节241两端产生的电场方向相反的原理，来抵消所述两个同频天线中从其中一个天线耦合到另一个天线上的感应电场。
在所述第三实施方式的一种实现形式中，如图16-图19所示，所述寄生结构24为线天线，所述线天线工作在半波长模式。
具体地，如图16所示，所述第二中框412上开设有第三缝隙G3和第四缝隙G4，所述 第三缝隙G3与所述第四缝隙G4将所述第二中框412分割成依次相邻的第四子段T4、第五子段T5、和第六子段T6。其中，所述第五子段T5为所述线天线24的寄生枝节241。
请一并参阅图16和图18，所述寄生枝节241与所述第二主体12上的第二参考地121通过第二槽缝S2间隔开，其中，在所述电子设备100处于折叠状态时，所述第一槽缝S1与第二槽缝S2相对。
请参阅图19，所述寄生枝节241为条形导体，包括位于所述寄生枝节241的中部两侧的第一辐射体L1和第二辐射体L2，所述第一辐射体L1和所述第二辐射体L2为一体结构。在所述电子设备100处于折叠状态时，所述第一辐射体L1与所述第一辐射枝节211重叠设置，所述第二辐射体L2与所述第二辐射枝节221重叠设置。
请一并参阅图18和图19，所述线天线24还包括分别与所述寄生枝节241两端耦接的第四匹配电路242和第五匹配电路243，其中，所述第四匹配电路242和所述第五匹配电路243用于调整所述寄生结构24的谐振频率，使所述寄生结构24与所述两个同频天线相耦合而产生的感应电场与所述两个同频天线产生的同向感应电场具有更理想的抵消效果，从而达到抑制所述两个同频天线中的任意一个天线上的辐射能量耦合到所述另一个天线上的目的。
所述第四匹配电路242和所述第五匹配电路243均可设置于所述第二电路板组件521上，且可包含电容、电感或开关元件等中的一个或多个，其具体的电路架构可根据实际需求设定，本申请对此不进行具体限定。
在所述第三实施方式中，所述寄生枝节241的长度为所述寄生结构24的谐振频率对应的波长的二分之一，即所述两个同频天线的工作波长的二分之一。在实际应用中，可通过调节所述第三缝隙G3和所述第四缝隙G4的位置来调节所述寄生枝节241的长度。反过来，也可以通过调节所述寄生枝节241的长度来调节所述半波长模式的谐振的频率范围。
其中，当所述线天线24作为有源天线来使用时，其工作模式与中国专利申请CN112751159A中所介绍的线天线的差模(differential mode,DM)线天线模式相同或相似，具体工作原理可参阅中国专利申请CN112751159A中对线天线的DM线天线模式的具体介绍，在此不进行赘述。在本申请中，所述线天线24作为无源的寄生结构来使用，其与所述两个同频天线中被激励的天线进行磁场耦合馈电，工作原理与所述线天线24作为有源天线来使用时的工作原理相似。请参阅图20，当所述线天线24与所述两个同频天线中的任意一个天线耦合馈电形成半波长模式的谐振时，在所述寄生枝节241的第一辐射体L1和第二辐射体L2上产生的感应电流的方向相同；所述寄生枝节241在其与第二参考地121之间的第二槽缝S2内产生的感应电场在所述寄生枝节241的中部两侧呈现反向分布，即在所述第一辐射体L1与所述第二参考地121之间的第二槽缝S2内产生的感应电场，与在所述第二辐射体L2与所述第二参考地121之间的第二槽缝S2内产生的感应电场方向相反。
下面对所述天线系统203的工作原理进行介绍。
以激励所述第二天线22为例，在所述电子设备100处于折叠状态下，当所述第二天线22的第二馈电点222给所述第二辐射枝节221馈电时，根据上文的介绍可知，在所述第二辐射枝节221上会激励出电流，在所述第二辐射枝节221的周围会激励出电场。如图21(a)-图21(c)所示，在第一时刻t1，若所述第二辐射枝节221表面带负电荷，则带负电荷的所述第二辐射枝节221会在其附近的所述第一参考地111上感应出正电荷。此时，所述第二辐射枝节221在所述第一槽缝S1内激励出的第二电场E2的方向为从所述第一参考地111指向所述第二辐射枝节221(如图21(b)和图21(c)所示的方向)。
由于所述寄生枝节241的第二辐射体L2靠近所述第二辐射枝节221，在所述第二辐射枝节221周围激励出的磁场的磁感线同时环绕所述第二辐射枝节221和所述第二辐射体L2。由于所述第二辐射枝节221和所述第二辐射体L2共用相同的磁场，根据楞次定律，在所述第二辐射体L2上产生的感应电流的方向与在所述第二辐射枝节221上产生的激励电流的方向相同。也就是说，所述第二辐射枝节221与所述第二辐射体L2通过磁场耦合，在所述第二辐射体L2上感应出同方向的电流。
由于所述第二参考地121靠近所述第二辐射体L2，且在两者之间存在所述第二槽缝S2，因此，所述第二辐射体L2上的感应电流在所述第二辐射体L2附近的第二参考地121上会感应出电动势。如此，在所述第二辐射体L2与所述第二参考地121之间的第二槽缝S2内会形成第四电场E4。
其中，在同一时刻，例如上述的第一时刻t1，若所述第二辐射枝节221的表面带负电荷，相应地，所述第二辐射体L2的表面也带负电荷，带负电荷的所述第二辐射体L2会在其附近的所述第二参考地121上感应出正电荷。此时，在所述第二槽缝S2内形成的所述第四电场E4的方向为从所述第二参考地121指向所述第二辐射体L2(如图21(b)和图21(d)所示的方向)。
由于所述线天线24被所述第二天线22通过磁场耦合激励，根据图20所示的线天线24被激励时所产生的电流和电场分布原理，在所述第一辐射体L1和所述第二辐射体L3上产生的感应电流方向相同，在所述第一辐射体L1和所述第二参考地121之间形成的感应电场的方向，与在所述第二辐射体L2和所述第二参考地121之间形成的感应电场的方向相反，因此，在上述第一时刻t1时，如图21(d)和图21(e)所示，所述第一辐射体L1在其与所述第二参考地121之间的第二槽缝S2内感应出的第五电场E5的方向为从所述第一辐射体L1指向所述第二参考地121。
另外，如图21(a)和图21(b)所示，在同一时刻，例如上述的第一时刻t1，由于所述第二辐射枝节221表面带负电荷，所述第二辐射枝节221在所述中间缝隙G0内激励出的第一电场E1的方向为从所述寄生枝节241的第二辐射体L2指向所述第二辐射枝节221；由于所述第二辐射体L2表面带负电荷，所述第二辐射体L2在所述中间缝隙G0内感应出的第六电场E6的方向为从所述第二辐射枝节221指向所述第二辐射体L2。
如此，在所述中间缝隙G0内，由所述第二辐射枝节221激励产生的所述第一电场E1与由所述第二辐射体L2感应产生的第六电场E6的方向相反，所述第一电场E1部分或全部被所述第六电场E6抵消，所述第二辐射枝节221通过所述中间缝隙G0以及所述寄生枝节241耦合到所述第一天线21的第一辐射枝节211上的电场被削减或被消除。
如图21(e)所示，所述第一辐射体L1在所述中间缝隙G0内感应出的电场与所述第一电场E1的方向相同，且所述第一辐射体L1靠近所述第一辐射枝节211，因此，所述第一电场E1未被抵消的剩余部分以及由所述第一辐射体L1在所述中间缝隙G0内感应出的电场共同耦合到所述第一辐射枝节211上，其中，耦合到所述第一辐射枝节211上的第七电场E7如图21(a)所示。如此，在所述第一辐射枝节211上会感应出电流，在所述第一辐射枝节211与所述第一参考地111之间的第一槽缝S1内会形成第三电场E3。
根据上述分析可知，在所述第一时刻t1，如图21(c)和图21(e)所示，所述第一辐射枝节211在其与所述第一参考地111之间的第一槽缝S1内感应出的第三电场E3的方向为从所述第一参考地111指向所述第一辐射枝节211。
根据上述分析还可知，在同一时刻，例如所述第一时刻t1，如图21(c)-图21(e)所示，所述第二辐射体L2在所述第二槽缝S2内感应出的第四电场E4的方向，与所述第二辐射枝节221在所述第一槽缝S1内感应出的第二电场E2的方向以及所述第一辐射枝节211在所述第一槽缝S1内感应出的第三电场E3的方向均相同；所述第一辐射体L1在所述第二槽缝S2内感应出的第五电场E5的方向与所述第二辐射枝节221在所述第一槽缝S1内感应出的第二电场E2的方向以及所述第一辐射枝节211在所述第一槽缝S1内感应出的第三电场E3的方向均相反。在折叠状态下，由于所述第一辐射枝节211与所述第一辐射体L1重叠，所述第一槽缝S1与所述第二槽缝S2相对，因此，所述第三电场E3部分或全部会被所述第五电场E5抵消，从而能够削减或消除从所述第二辐射枝节221耦合到所述第一辐射枝节211上的能量。
本领域的技术人员可以理解的是，所述第一天线21激励时的电场抵消原理与所述第二天线22激励时的电场抵消原理相同，具体技术细节请参阅上文对激励所述第二天线22的相关介绍，在此不进行重复赘述。
综上所述可知，本申请第三实施方式提供的所述天线系统203能够达到抑制所述两个同频天线中的任意一个天线上的辐射能量通过所述第二主体上的第二参考地121耦合到所述另一个天线上的目的，从而能够有效地提高所述第一天线21与所述第二天线22之间在所述电子设备100处于折叠状态时的隔离度。
图22(a)示出了在所述电子设备100处于折叠状态且所述第二天线22激励时，图19所示的天线系统203包含的两个同频天线与第一主体11上的第一参考地111之间的第一槽缝S1内形成的电场分布仿真图。对比图14(d)和图22(a)可知，所述第二天线22上产生的电场被所述寄生结构24产生的感应电场抵消掉较大部分的能量之后，再耦合到所述第一天线21上的能量基本很少了。
图22(b)示出了所述天线系统203包含的两个同频天线在所述电子设备100处于折叠状态时的S参数曲线示意图。从图22(b)中可看出，所述天线系统203的两个同频天线在工作频段0.8GHZ-0.9GHz的隔离度为-20dB以下，隔离度较高。
在所述第三实施方式的另一种实现形式中，如图23-图24所示，寄生结构24’为槽天线，所述槽天线工作在半波长模式。
具体地，所述槽天线的寄生枝节241’包括位于所述寄生枝节241’的中部两侧的第一辐射体L1’和第二辐射体L2’，所述第一辐射体L1’与所述第二辐射体L2’通过第五缝隙G5间隔开，所述第一辐射体L1’远离所述第五缝隙G5或所述第二辐射体L2’的一端接地，所述第二辐射体L2’远离所述第五缝隙G5或所述第一辐射体L1’的一端接地。
所述第一辐射体L1'和所述第二辐射体L2'的长度可以为所述寄生结构24的谐振频率对应的波长的四分之一，即所述两个同频天线的工作波长的四分之一。在实际应用中，可通过调节所述第一辐射体L1’的接地点和所述第五缝隙G5的位置来调节所述第一辐射体L1'的长度；可通过调节所述第五缝隙G5和所述第二辐射体L2'的接地点的位置来调节所述第二辐射体L2'的长度。反过来，也可以通过调节所述第一辐射体L1'和所述第二辐射体L2'的长度来调节所述半波长模式的谐振的频率范围。
其中，当所述槽天线24’作为有源天线来使用时，其工作模式与中国专利申请CN112751159A中所介绍的槽天线的共模(common mode,CM)槽天线模式相同，具体工作原理可参阅中国专利申请CN112751159A中对槽天线的CM槽天线模式的具体介绍，在此不 进行赘述。在本申请中，所述槽天线24’作为无源的寄生结构来使用，其与所述两个同频天线中被激励的天线进行磁场耦合馈电，工作原理与所述槽天线24’作为有源天线来使用时的工作原理相似。请参阅图25，当所述槽天线24’与所述两个同频天线中的任意一个天线耦合馈电形成半波长模式的谐振时，在所述第一辐射体L1'和所述第二辐射体L2'上产生的感应电流的方向相同；在所述第一辐射体L1'与所述第二参考地121之间的第二槽缝S2内产生的感应电场，与在所述第二辐射体L2'与所述第二参考地121之间的第二槽缝S2内产生的感应电场方向相反。
在本申请中，所述天线系统203采用所述槽天线24’作为所述寄生结构的工作原理，与所采用所述线天线24作为所述寄生结构的工作原理相同，两者对所述两个同频天线中产生的感应电场均能达到相似的抵消效果，具体技术细节请参阅上文的介绍，再此不进行重复赘述。
在本申请中，所述第一槽缝S1、第二槽缝S2、第一缝隙G1、第二缝隙G2、第三缝隙G3、第四缝隙G4、第五缝隙G5中的任意一个或多个可采用非导体介质填充，例如，可采用聚碳酸酯(Polycarbonate，PC)填充。在实际应用中，所述第一槽缝114、第二槽缝S2、第一缝隙G1、第二缝隙G2、第三缝隙G3、第四缝隙G4、和第五缝隙G5的宽度可以根据实际情况设定，本申请的实施方式对此不做限制。
综上所述，本申请提供的所述天线系统203通过将两个同频天线设置在可折叠的电子设备100的同一侧，并在两个同频天线之间串联去耦结构23，从而利用所述去耦结构23来隔断所述两个同频天线之间经过所述第一缝隙的耦合路径，可以有效地解决所述两个同频天线在所述电子设备100处于展开状态时具有较差隔离度的问题。所述天线系统203还通过在所述电子设备100的另一侧增加1/2波长的天线结构，即寄生结构24，在所述电子设备100处于折叠状态时，通过所述寄生结构24与所述两个同频天线耦合形成半波长模式的谐振，其中，在所述寄生结构24的寄生枝节241的中部两侧与所述寄生结构24附近的第二参考地121之间形成的感应电场的方向相反，通过所述感应电场可以抵消从所述两个同频天线中的任意一个天线耦合到另一个天线上的电场，从而抑制所述两个同频天线中的任意一个天线上的辐射能量通过所述第二主体上的第二参考地121耦合到所述另一个天线上，进而提高所述第一天线21和所述第二天线22之间的隔离度，可以有效地解决所述两个同频天线在所述电子设备100处于折叠状态时具有较差隔离度的问题。如此，所述天线系统203的两个同频天线在所述电子设备100处于展开态或折叠态时均具有较高的隔离度以及较理想的天线性能，从而使包含所述天线系统203的电子设备100具有较佳的无线通信功能。
应说明的是，在本申请中，天线的某种波长模式(如二分之一波长模式、四分之一波长模式等)中的波长可以是指该天线辐射的信号的波长。例如，天线的二分之一波长模式可产生2.4GHz频段的谐振，其中，二分之一波长模式中的波长是指天线辐射2.4GHz频段的信号的波长。应理解的是，辐射信号在空气中的波长可以如下计算：波长＝光速/频率，其中，频率为辐射信号的频率。辐射信号在介质中的波长可以如下计算：波长＝(光速/√ε)/频率，其中，ε为该介质的相对介电常数，频率为辐射信号的频率。
以上，仅为本申请的部分实施方式，本申请的保护范围不局限于此，任何熟知本领域的技术人员在本申请揭露的技术范围内，可轻易想到变化或替换，都应涵盖在本申请的保护范围之内。因此，本申请的保护范围应以权利要求的保护范围为准。

Claims (17)

  1. 一种天线系统，应用于可折叠电子设备中，所述可折叠电子设备包括相互连接且能够相对折叠或展开的第一主体和第二主体；其特征在于，所述天线系统包括：
    两个同频天线，设置于所述第一主体上，所述两个同频天线之间通过第一缝隙间隔开；
    去耦结构，串联于所述两个同频天线之间；以及
    寄生结构，设置于所述第二主体上，所述寄生结构在所述电子设备处于折叠状态时分别与所述两个同频天线至少部分重叠；所述寄生结构为1/2波长的天线结构，所述波长为所述两个同频天线的工作波长。
  2. 根据权利要求1所述的天线系统，其特征在于，所述两个同频天线包括第一天线和第二天线，其中，所述第一天线包括第一辐射枝节，所述第二天线包括第二辐射枝节，所述第一辐射枝节和所述第二辐射枝节之间通过所述第一缝隙间隔开；
    所述寄生结构包括寄生枝节，其中，在所述电子设备处于完全折叠的状态时，所述寄生枝节与所述第一辐射枝节和所述第二辐射枝节重叠。
  3. 根据权利要求2所述的天线系统，其特征在于，在所述电子设备处于完全折叠的状态时，所述寄生枝节的中部与所述第一缝隙相对，并且所述第一缝隙的中心在所述寄生枝节上的投影到所述寄生枝节的中部的距离小于或等于所述两个同频天线的工作波长的八分之一。
  4. 根据权利要求3所述的天线系统，其特征在于，所述寄生枝节包括位于所述寄生枝节的中部两侧的第一辐射体和第二辐射体，其中，在所述电子设备处于折叠状态时，所述第一辐射体与所述第一辐射枝节重叠设置，所述第二辐射体与所述第二辐射枝节重叠设置。
  5. 根据权利要求4所述的天线系统，其特征在于，所述第一辐射枝节和所述第二辐射枝节分别与所述第一主体上的第一参考地通过第一槽缝间隔开；
    所述寄生枝节与所述第二主体上的第二参考地通过第二槽缝间隔开；
    其中，在所述电子设备处于折叠状态时，所述第一槽缝与第二槽缝相对。
  6. 根据权利要求5所述的天线系统，其特征在于，所述电子设备处于折叠状态且所述两个同频天线中的任意一个天线工作时，所述寄生结构与工作的天线耦合而形成半波长模式的谐振，其中，在所述第一辐射体和所述第二辐射体上产生的感应电流的方向相同；在所述第一辐射体与所述第二参考地之间的第二槽缝内产生的感应电场，与在所述第二辐射体与所述第二参考地之间的第二槽缝内产生的感应电场方向相反。
  7. 根据权利要求6所述的天线系统，其特征在于，在所述电子设备处于折叠状态且所述两个同频天线中的任意一个天线工作时，工作的天线在所述第一槽缝内激励的电场与所述两个同频天线中的另一个天线在所述第一槽缝内感应的电场为同向电场。
  8. 根据权利要求4-6任意一项所述的天线系统，其特征在于，所述寄生结构为线天线，所述第一辐射体和所述第二辐射体为一体结构；
    所述寄生枝节的长度为所述两个同频天线的工作波长的二分之一。
  9. 根据权利要求8所述的天线系统，其特征在于，所述线天线还包括分别与所述寄生枝节两端耦接的两个匹配电路，其中，所述两个匹配电路用于调整所述寄生结构的谐振频率。
  10. 根据权利要求4-6任意一项所述的天线系统，其特征在于，所述寄生结构为槽天线，所述第一辐射体与所述第二辐射体通过缝隙间隔开，所述第一辐射体远离所述第二辐射体的一端接地，所述第二辐射体远离所述第一辐射体的一端接地；
    所述第一辐射体和所述第二辐射体的长度为所述两个同频天线的工作波长的四分之一。
  11. 根据权利要求2所述的天线系统，其特征在于，所述第一辐射枝节包括与所述第一缝隙相邻的第一耦合端，所述第二辐射枝节包括与所述第一缝隙相邻的第二耦合端；
    所述去耦结构串联于所述第一辐射枝节的第一耦合端和所述第二辐射枝节的第二耦合端之间；
    所述去耦结构用于隔断所述两个同频天线之间经过所述第一缝隙的耦合路径。
  12. 根据权利要求1或11所述的天线系统，其特征在于，所述去耦结构为带阻滤波器，所述带阻滤波器包含电感元件，或电感与电容的组合。
  13. 根据权利要求2-7任意一项所述的天线系统，其特征在于，所述第一天线还包括与所述第一辐射枝节耦接的第一馈电点和第一接地点，其中，所述第一馈电点到所述第一缝隙的中心的最小距离小于所述第一接地点到所述第一缝隙的中心的最小距离；
    所述第二天线还包括与所述第二辐射枝节耦接的第二馈电点和第二接地点，其中，所述第二馈电点到所述第一缝隙的中心的最小距离大于所述第二接地点到所述第一缝隙的中心的最小距离。
  14. 根据权利要求13所述的天线系统，其特征在于，所述第一天线还包括与所述第一馈电点耦接的第一匹配电路，所述第一匹配电路用于实现所述第一天线的阻抗匹配；
    所述第二天线还包括与所述第二馈电点耦接的第二匹配电路，所述第二匹配电路用于实现所述第二天线的阻抗匹配。
  15. 根据权利要求14所述的天线系统，其特征在于，所述第二天线还包括与所述第二接地点耦接的第三匹配电路，所述第三匹配电路用于实现所述第二天线的阻抗匹配。
  16. 根据权利要求2所述的天线系统，其特征在于，所述第一主体还包括第一中框，所述第一中框部分或全部由金属材料制成，所述第一辐射枝节与所述第二辐射枝节均构成所述第一中框的一部分结构；
    所述第二主体还包括第二中框，其中，所述第一中框在所述电子设备处于完全折叠的状态时与所述第二中框重叠设置；所述第二中框部分或全部由金属材料制成，所述寄生枝节构成所述第二中框的一部分结构。
  17. 一种可折叠电子设备，包括：
    第一主体和第二主体，相互连接且两者能够相对折叠或展开；以及
    如权利要求1-16任意一项所述的天线系统，所述天线系统包含的两个同频天线设置于所述第一主体上，所述天线系统包含的寄生结构设置于所述第二主体上。
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