WO2024199162A1 - 可折叠电子设备 - Google Patents

可折叠电子设备 Download PDF

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Publication number
WO2024199162A1
WO2024199162A1 PCT/CN2024/083455 CN2024083455W WO2024199162A1 WO 2024199162 A1 WO2024199162 A1 WO 2024199162A1 CN 2024083455 W CN2024083455 W CN 2024083455W WO 2024199162 A1 WO2024199162 A1 WO 2024199162A1
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WO
WIPO (PCT)
Prior art keywords
antenna
frequency band
length
matching circuit
branch
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/CN2024/083455
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English (en)
French (fr)
Inventor
郑立成
程孝奇
张声陆
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Vivo Mobile Communication Co Ltd
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Vivo Mobile Communication Co Ltd
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Filing date
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Publication of WO2024199162A1 publication Critical patent/WO2024199162A1/zh
Anticipated expiration legal-status Critical
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Classifications

    • 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
    • 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

Definitions

  • the present application belongs to the field of communication technology, and specifically relates to a foldable electronic device.
  • the antenna design scheme in existing foldable screen electronic devices usually designs the antenna in the main body and adds a switch to the sub-body for tuning. However, this cannot completely solve the problem of insufficient layout space in the main body. Placing the antenna in the sub-body faces many challenges, such as the decrease in antenna efficiency of the electronic device after folding and the deterioration of isolation between antennas. There is currently no good solution to this problem.
  • the purpose of the embodiments of the present application is to provide a foldable electronic device that can solve the problem of poor antenna efficiency in existing foldable screen electronic devices.
  • an embodiment of the present application provides a foldable electronic device, including a foldable screen and an antenna structure, wherein the antenna structure includes: a first antenna, a second antenna, a first feed source, a second feed source, and a first matching circuit;
  • the first antenna is arranged on the frame of the main screen of the folding screen
  • the second antenna is arranged on the frame of the sub-screen of the folding screen
  • the first antenna and the second antenna are both connected to a hinge, and the hinge is arranged between the main screen and the sub-screen;
  • a first position on the first antenna close to the second antenna is grounded
  • the first feed source is connected to a second position on the first antenna far away from the second antenna, one end of the first matching circuit is connected to the second position, and the other end is grounded;
  • the second feed source is connected to the second antenna, and a third position of the second antenna close to the first antenna is grounded;
  • the first antenna and the second antenna operate in different frequency bands
  • the first matching circuit includes two tuning branches, one of which is used to tune the resonant frequency band of the first antenna to a first frequency band, so that when the folding screen is in an unfolded state, the parasitic current generated by the first antenna is in the same direction as the current generated by the second antenna, and the other tuning branch is used to tune the resonant frequency band of the first antenna to a second frequency band, so that when the folding screen is in a folded state, the parasitic current generated by the first antenna is in the same direction as the current generated by the second antenna, and the first frequency band is lower than the operating frequency band of the second antenna, and the second frequency band is higher than the operating frequency band of the second antenna.
  • a foldable electronic device includes a folding screen and an antenna structure
  • the antenna structure includes: a first antenna, a second antenna, a first feed source, a second feed source and a first matching circuit; wherein the first antenna is arranged on the frame of the main screen of the folding screen, and the second antenna is arranged on the frame of the sub-screen of the folding screen, and the first antenna and the second antenna are both connected to a hinge, and the hinge is arranged between the main screen and the sub-screen; a first position on the first antenna close to the second antenna is grounded; the first feed source is connected to a second position on the first antenna far from the second antenna, one end of the first matching circuit is connected to the second position, and the other end is grounded; the second feed source is connected to the second antenna , a third position on the second antenna close to the first antenna is grounded; the first antenna and the second antenna operate in different frequency bands, the first matching circuit includes two tuning branches, one of which is used to tune the resonant frequency band of the first
  • a first matching circuit including two tuning branches on the antenna of the main screen of a foldable electronic device, not only can the resonant frequency band of the first antenna be tuned by one tuning branch when the electronic device is unfolded so that the first antenna and the second antenna generate current in the same direction, thereby improving the antenna efficiency in the unfolded state, but also when the electronic device is folded, the resonant frequency band of the first antenna can be tuned by another tuning branch to change the phase of the parasitic resonant current generated by the first antenna in the working frequency band of the second antenna so that it is in the same direction as the current generated by the second antenna, thereby increasing the antenna radiation aperture efficiency and improving the antenna efficiency in the folded state.
  • FIG1 is a schematic diagram of an antenna structure of a foldable electronic device provided in an embodiment of the present application.
  • FIG2 is a schematic diagram of the antenna structure of a foldable electronic device in an unfolded state provided by an embodiment of the present application
  • FIG3 is a schematic diagram of the antenna structure of the foldable electronic device in the folded state provided by an embodiment of the present application.
  • FIG4 is a schematic diagram of the circuit structure of a first matching circuit M1 in the antenna structure provided in an embodiment of the present application;
  • 5a to 5c are schematic diagrams of current distribution of each antenna in an unfolded state provided by an embodiment of the present application.
  • 6a to 6c are schematic diagrams of circuit structures of various matching circuits in the antenna structure provided in an embodiment of the present application.
  • 7a to 7c are Smith charts of the antennas in the unfolded state provided by the embodiments of the present application.
  • FIG7d is a schematic diagram of the isolation of each antenna in the unfolded state provided by an embodiment of the present application.
  • 8a to 8c are efficiency diagrams of each antenna in an unfolded state provided by an embodiment of the present application.
  • 9a to 9c are schematic diagrams of current distribution of each antenna in a folded state provided by an embodiment of the present application.
  • 10a to 10c are Smith charts of the antennas in a folded state provided by an embodiment of the present application.
  • FIG11 is a schematic diagram of the isolation of each antenna in a folded state provided in an embodiment of the present application.
  • 12a to 12c are efficiency diagrams of various antennas in a folded state provided by an embodiment of the present application.
  • FIG. 13a to 13c are simplified schematic diagrams of the principle of improving the efficiency of the GPSL5 antenna provided in the embodiments of the present application;
  • 14a and 14b are schematic diagrams of current distribution of a dipole antenna provided in an embodiment of the present application in different states;
  • 15 is a schematic diagram showing the change of frequency deviation of the main and auxiliary screen antennas with the frequency ratio in the folded state provided by an embodiment of the present application;
  • 16a to 16c are schematic diagrams of frequency deviation of each antenna in an unfolded state and a folded state provided by an embodiment of the present application;
  • FIG17 is a Smith chart of the second antenna in the unfolded state provided by an embodiment of the present application.
  • FIG. 18 a and FIG. 18 b are efficiency diagrams of the second antenna provided in an embodiment of the present application in an unfolded state and a folded state, respectively.
  • first, second, etc. in the specification and claims of this application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first”, “second”, etc. are generally of one type, and the number of objects is not limited.
  • the first object can be one or more.
  • “and/or” in the specification and claims represents at least one of the connected objects, and the character “/" generally indicates that the objects associated with each other are in an "or” relationship.
  • Figure 1 is a schematic diagram of the antenna structure of a foldable electronic device provided in an embodiment of the present application.
  • Figures 2 and 3 are schematic diagrams of the structure of the antenna structure provided in an embodiment of the present application in a foldable electronic device.
  • the foldable electronic device 10 includes a folding screen 11 and an antenna structure, and the antenna structure includes: a first antenna A1, a second antenna A2, a first feed source F1, a second feed source F2 and a first matching circuit M1;
  • the first antenna A1 is arranged on the frame of the main screen 111 of the folding screen 11, and the second antenna A2 is arranged on the frame of the sub-screen 112 of the folding screen.
  • the first antenna A1 and the second antenna A2 are both connected to the hinge 12, and the hinge 12 is arranged between the main screen 111 and the sub-screen 112.
  • a first position of the first antenna A1 close to the second antenna A2 is grounded;
  • the first feed source F1 is connected to a second position on the first antenna A1 away from the second antenna A2, one end of the first matching circuit M1 is connected to the second position, and the other end is grounded;
  • the second feed source F2 is connected to the second antenna A2, and a third position of the second antenna A2 close to the first antenna A1 is grounded;
  • the first antenna A1 and the second antenna A2 operate in different frequency bands
  • the first matching circuit M1 includes two tuning branches, one of which is used to tune the resonant frequency band of the first antenna A1 to a first frequency band, so that when the folding screen 11 is in the unfolded state, the parasitic current generated by the first antenna A1 is in the same direction as the current generated by the second antenna A2, and the other tuning branch is used to tune the resonant frequency band of the first antenna A1 to a second frequency band, so that when the folding screen 11 is in the folded state, the parasitic current generated by the first antenna A1 is in the same direction as the current generated by the second antenna A2, and the first frequency band is lower than the operating frequency band of the second antenna A2, and the second frequency band is higher than the operating frequency band of the second antenna A2.
  • the first antenna A1 and the second antenna A2 can be metal frame antennas, which serve as the radiating body of the antenna. As shown in FIG. 2 and FIG. 3 , the first antenna A1 is arranged on the frame 1111 of the main screen 111 of the foldable electronic device 10, and the second antenna A2 is arranged on the frame 1121 of the secondary screen 112 of the foldable electronic device 10, and the first antenna A1 and the second antenna A2 are both connected to the hinge 12, and the first antenna A1 and the second antenna A2 are both connected to a feed source, and both are provided with a lower point, that is, the first antenna A1 and the second antenna A2 can be arranged side by side on both sides of the hinge 12 to form an inverted-F antenna (IFA).
  • IFA inverted-F antenna
  • the hinge 12 can be a hinge in a folding screen, which is a key component for supporting the folding or unfolding of a large screen, and is also a key component for connecting the metal middle frame of the main screen and the metal middle frame of the secondary screen.
  • the first position of the first antenna A1 close to the second antenna A2 is grounded, and the third position of the second antenna A2 close to the first antenna A1 is grounded, that is, the first antenna A1 and the second antenna A2 are both provided with an antenna lower position, which is used to connect the middle frame antenna on the outside of the foldable electronic device 10 to the middle frame ground inside the foldable electronic device 10.
  • a first feed source F1 is connected to a second position of the first antenna A1 away from the second antenna A2.
  • the first feed source F1 is used for antenna feeding and is used to transmit the radio frequency power signal of the foldable electronic device 10 to the first antenna A1 body.
  • the second antenna A2 is connected to a second feed source F2, which is used to feed the antenna and transmit the radio frequency power signal of the foldable electronic device 10 to the second antenna A2 body.
  • a first matching circuit M1 is also connected to the second position on the first antenna A1, and the first matching circuit M1 includes two tuning branches, which are respectively used to tune the resonant frequency of the first antenna A1 in the unfolded state and the folded state of the foldable electronic device 10.
  • one of the tuning branches is used to tune the resonant frequency of the first antenna A1 when the foldable electronic device 10 is in the unfolded state, and pull the parasitic resonant frequency of the first antenna A1 to a frequency point lower than the center frequency of the operating frequency band of the second antenna A2, even if the parasitic resonant frequency band of the first antenna A1 is lower than the operating frequency band of the second antenna A2, so that the parasitic current generated by the first antenna A1 in the operating frequency band of the second antenna A2 is in the same direction as the current generated by the second antenna A2, forming a same-direction dipole current, thereby improving the efficiency of the second antenna A2 in the unfolded state; the other tuning branch is used to tune the resonant frequency of the first antenna A1 when the foldable electronic device 10 is in the unfolded state, and pull the parasitic resonant frequency of the first antenna A1 to a frequency point lower than the center frequency of the operating frequency band of the second antenna A2.
  • the harmonic branch is used to tune the resonant frequency of the first antenna A1 when the foldable electronic device 10 is in a folded state, and pull the parasitic resonant frequency of the first antenna A1 to a frequency point higher than the center frequency of the operating frequency band of the second antenna A2. Even if the parasitic resonant frequency band of the first antenna A1 is higher than the operating frequency band of the second antenna A2, the parasitic resonant current generated by the first antenna A1 in the operating frequency band of the second antenna A2 is reversed by 180 degrees, and then made in the same direction as the current of the second antenna A2, forming a same-direction dipole current, thereby improving the efficiency of the second antenna A2 in the folded state.
  • the first antenna A1 and the second antenna A2 can be designed to work in different frequency bands.
  • the first antenna A1 can work in a slightly higher frequency band, such as N78 band, WIFI2.4G band, middle high band (Middle High Band, MHB), etc.
  • the second antenna A2 can work in a lower frequency band, such as GPSL5 band.
  • GPS refers to the Global Positioning System (Global Positioning System).
  • the current of the second antenna A2 on the secondary screen 112 in the folded state is consistent with the current direction in the unfolded state shown in FIG5c.
  • the first antenna A1 is equivalent to an open circuit or a small capacitor ground in the working frequency band of the second antenna A2, such as the GPSL5 band, and the resonant frequency of the first antenna A1 on the main screen 111 will move to around 1.27 GHz, as shown in the Smith chart of the folded state GPSL5 shown in FIG10c.
  • the phase of the resonant current of the first antenna A1 turns 180° in the GPSL5 band, and its current direction is shown as the current 6 (I6) in FIG9c, so that in the GPSL5 band, the parasitic resonant current 6 (I6) of the first antenna A1 and the current 5 (I5) of the second antenna A2 in GPSL5 are in the same direction, thereby increasing the antenna radiation aperture efficiency, and the antenna efficiency of the second antenna A2 working in the GPSL5 band after the folding state is improved by about 1.5 dB, as shown in FIG12c, the folded state efficiency of GPSL5.
  • the foldable electronic device 10 When the foldable electronic device 10 is in the unfolded state, it is equivalent to adding a new parasitic auxiliary resonance to the working frequency band of the second antenna A2, such as the GPSL5 band. As shown in FIG7c , the resonance can be pulled to a frequency lower than GPSL5, around 1.12 GHz. As shown in FIG8c , the efficiency of the unfolded state in the GPSL5 band can be improved by 1dB to 1.5dB.
  • the antenna structure further includes a third antenna A3 and a fourth antenna A4;
  • the third antenna A3 is arranged at the frame of the main screen 111, and has a gap with the first antenna A1;
  • the fourth antenna A4 is arranged at the frame of the auxiliary screen 112, and has a gap with the second antenna A2;
  • a fourth position of the third antenna A3 far away from the first antenna A1 is grounded;
  • a fifth position of the fourth antenna A4 away from the third antenna A3 is grounded.
  • multiple antennas may be arranged on the main screen 111 and the auxiliary screen 112 of the foldable electronic device 10, respectively, to obtain more antenna working modes.
  • a third antenna A3 may be arranged side by side on the frame of the main screen 111 beside the first antenna A1
  • a fourth antenna A4 may be arranged side by side on the frame of the auxiliary screen 112 beside the second antenna A2, and there is a gap between the third antenna A3 and the first antenna A1, and there is a gap between the fourth antenna A4 and the second antenna A2, and antenna lower positions are provided on the third antenna A3 and the fourth antenna A4.
  • the third antenna A3 can be designed to operate in a frequency band different from the first antenna A1 and the second antenna A2, such as the GPSL1 frequency band.
  • the fourth antenna A4 is designed as a parasitic branch, which has no practical effect in the unfolded state, generates high-order harmonics and reverse parasitic currents in the folded state, and reduces the effect on the efficiency of the first antenna A1 through a tuned matching circuit.
  • the first matching circuit M1 includes a first branch, a second branch and a third branch connected in parallel, the first branch includes a first capacitor C1 and a first inductor L1 connected in series, the second branch includes a second inductor L2 and a first switch S1 connected in series, and the third branch includes a second capacitor C2 and a second switch S2 connected in series;
  • the first switch S1 When the folding screen 11 is in the unfolded state, the first switch S1 is in the disconnected state, and the second switch S2 is in the In the closed state, the resonant frequency band of the first antenna A1 is tuned to the first frequency band, so that the parasitic current generated by the first antenna A1 in the unfolded state is in the same direction as the current generated by the second antenna A2; when the folding screen 11 is in the folded state, the first switch S1 is in the closed state, and the second switch S2 is in the open state, and the resonant frequency band of the first antenna A1 is tuned to the second frequency band, so that the parasitic current generated by the first antenna A1 in the folded state is in the same direction as the current generated by the second antenna A2.
  • the first matching circuit M1 can be as shown in Figure 4, that is, it includes three parallel branches, namely a capacitor-inductor series branch, a switch-controlled inductor branch and a switch-controlled capacitor branch, wherein the first branch, i.e., the capacitor-inductor series branch and the second branch, i.e., the switch-controlled inductor branch, form a tuning branch for tuning the first antenna A1 in the folded state, and the first branch, i.e., the capacitor-inductor series branch and the third branch, i.e., the switch-controlled capacitor branch, form another tuning branch for tuning the first antenna A1 in the unfolded state.
  • the branch switch can be controlled to be on and off according to the different states of the folding screen 11 of the foldable electronic device 10, thereby switching different tuning branches to ensure the working efficiency of the antenna.
  • the first switch S1 of the second branch can be controlled to be in the disconnected state, and the second switch S2 of the third branch can be in the connected state, so that in this state, for the working frequency band of the second antenna A2 (such as the GPSL5 band), it is equivalent to adding a new parasitic auxiliary resonance.
  • the resonance can be pulled to a frequency lower than GPSL5, around 1.12 GHz.
  • the efficiency of the unfolded state in the GPSL5 band can be improved by 1dB to 1.5dB.
  • the first switch S1 of the second branch can be controlled to be in the connected state
  • the second switch S2 of the third branch can be controlled to be in the disconnected state, so as to improve the efficiency of the second antenna A2 in the GPSL5 frequency band in the folded state.
  • the current of the GPSL5 of the second antenna A2 on the auxiliary screen 112 in the folded state is consistent with the current direction in the unfolded state shown in Figure 5c, but at this time the first matching circuit M1 needs to be switched so that the first switch is in the connected state and the second switch is in the disconnected state.
  • the first antenna A1 is equivalent to an open circuit or a small capacitor grounded in the working frequency band of the second antenna A2, such as the GPSL5 frequency band, and the resonant frequency of the first antenna A1 on the main screen 111 will move to around 1.27 GHz, as shown in the Smith chart of the folded GPSL5 in Figure 10c.
  • the phase of the resonant current of the first antenna A1 turns 180° within the GPSL5 frequency band, and its current direction is shown as the current 6 (I6) in Figure 9c. Therefore, within the GPSL5 frequency band, the parasitic resonant current 6 (I6) of the first antenna A1 and the current 5 (I5) of the second antenna A2 in GPSL5 are in the same direction, thereby increasing the antenna radiation aperture efficiency.
  • the antenna efficiency of the second antenna A2 working in the GPSL5 frequency band is improved by about 1.5dB, as shown in the folded state efficiency of GPSL5 in Figure 12c.
  • the antenna efficiency of the antenna structure in the unfolded state can be improved, the isolation between antennas can be optimized, and the antenna efficiency of the antenna structure in the folded state can be improved.
  • the first matching circuit M1 may only include the first branch and the second branch.
  • the parasitic current of the first antenna A1 and the current of the second antenna A2 in GPSL5 are opposite, which reduces the efficiency of the second antenna A2 in the unfolded state in GPSL5.
  • the second inductance under this embodiment is smaller than the inductance when the first matching circuit M1 also includes the third branch.
  • the parasitic current resonant frequency of the first antenna A1 moves to 1.33GHz ⁇ 1.38GHz, as shown in Figure 17.
  • the efficiency of the unfolded GPSL5 will be reduced by 0.5dB compared with the original efficiency without parasitic resonance, as shown in Figure 18a, and the efficiency of the folded GPSL5 is equivalent to the case where the first matching circuit M1 also includes the third branch, as shown in Figure 18b. That is, the efficiency of the improved GPSL5 in the folded state can also be improved by 1dB, and the cost of adding an antenna switch in the first matching circuit M1 can be saved.
  • the sum of the antenna length L1, the antenna gap length L2 and the antenna length L3 is equal to half the wavelength of the first working frequency band of the first antenna A1, and the first working frequency band includes the WIFI 2.4G frequency band;
  • the antenna length L5 is equal to a quarter wavelength of the operating frequency band of the second antenna A2, and the operating frequency band of the second antenna A2 includes the GPSL5 frequency band;
  • L1 is the length from the endpoint of the third antenna A3 close to the first antenna A1 to the fourth position
  • L2 is the gap length between the first antenna and the third antenna
  • L3 is the length from the endpoint of the first antenna A1 away from the second antenna A2 to the second position
  • L5 is the length from the endpoint of the second antenna A2 away from the first antenna A1 to the third position.
  • the first antenna A1 can be designed to work in the WIFI 2.4G frequency band, and the second antenna A2 can work in the GPS L5 frequency band, so the antenna lengths of the first antenna A1, the second antenna A2, and the third antenna A3, as well as the gap length between the first antenna A1 and the third antenna A3 can be reasonably designed.
  • the first antenna A1 can also work in other frequency bands.
  • the antenna length L1 on the third antenna A3 is the length from the lower point to the end point close to the first antenna A1
  • L2 is the gap between the first antenna A1 and the third antenna A3
  • the antenna length L3 on the first antenna A1 is the length from the end point close to the third antenna A3 to the feeding point.
  • the length of L1+L2+L3 can be designed to be equal to the resonant frequency band of the first antenna A1, that is, half the wavelength of the WIFI2.4G frequency band.
  • the antenna length L5 of the second antenna A2 is the length from the end point away from the first antenna A1 to the lower point.
  • the length of L5 can be designed to be equal to a quarter wavelength of the resonant frequency band of the second antenna A2, i.e., the GPS L5 frequency band.
  • the main screen antenna can operate in the WIFI2.4G frequency band and the secondary screen antenna can operate in the GPSL5 frequency band, so that the frequency ratio of the antenna bands of the main and secondary screens can be about 1.9, so as to reduce the frequency deviation problem of the two corresponding antenna branch bands after folding.
  • the sum of the antenna length L3 and the antenna length L4 is equal to a quarter wavelength of a second operating frequency band of the first antenna A1, and the second operating frequency band includes a middle high band (MHB);
  • the antenna length L5 is equal to a quarter wavelength of the operating frequency band of the second antenna A2, and the operating frequency band of the second antenna A2 includes the GPSL5 frequency band;
  • L3 is the length from the endpoint of the first antenna A1 away from the second antenna A2 to the second position
  • L4 is the length from the second position to the first position
  • L5 is the length from the endpoint of the second antenna A2 away from the first antenna A1 to the third position.
  • the first antenna A1 may be designed to work in the MHB frequency band, and the second antenna A2 may work in the GPSL5 frequency band, so the antenna lengths of the first antenna A1 and the second antenna A2 may be reasonably designed.
  • the antenna length L3 on the first antenna A1 is the length between the end point close to the third antenna A3 and the feeding point
  • the antenna length L4 on the first antenna A1 is the length between the feeding point and the lower point.
  • the length of L3+L4 can be designed to be equal to a quarter wavelength of the resonant frequency band of the first antenna A1 (such as the highest frequency band among the B1, B3 and B39 frequency bands).
  • the antenna length L5 of the second antenna A2 is the length from the end point away from the first antenna A1 to the lower point.
  • the length of L5 can be designed to be equal to a quarter wavelength of the resonant frequency band of the second antenna A2, i.e., the GPS L5 frequency band.
  • the main screen antenna can still operate in the MHB frequency band and the secondary screen antenna can operate in the GPSL5 frequency band, so that the frequency ratio of the antenna bands of the main and secondary screens can be made about 1.9, so as to reduce the frequency deviation problem of the two corresponding antenna branch bands after folding.
  • the antenna length L3 is equal to a quarter wavelength of a third operating frequency band of the first antenna A1, and the third operating frequency band includes an N78 frequency band;
  • the antenna length L5 is equal to a quarter wavelength of the operating frequency band of the second antenna A2, and the operating frequency band of the second antenna A2 includes the GPSL5 frequency band;
  • L3 is the length from the endpoint of the first antenna A1 away from the second antenna A2 to the second position
  • L5 is the length from the endpoint of the second antenna A2 away from the first antenna A1 to the third position.
  • the first antenna A1 may be designed to also work in the N78 frequency band, and the second antenna A2 may work in the GPSL5 frequency band, so the antenna lengths of the first antenna A1 and the second antenna A2 may be reasonably designed.
  • the antenna length L3 on the first antenna A1 is the length from the end point close to the third antenna A3 to the feeding point.
  • the length of L3 can be designed to be equal to the resonant frequency band of the first antenna A1, i.e., a quarter wavelength of the N78 frequency band.
  • the antenna length L5 of the second antenna A2 is the length from the end point away from the first antenna A1 to the lower point.
  • the length of L5 can be designed to be equal to a quarter wavelength of the resonant frequency band of the second antenna A2, i.e., the GPS L5 frequency band.
  • the main screen antenna can still operate in the N78 frequency band and the secondary screen antenna can operate in the GPSL5 frequency band, so that the frequency ratio of the antenna bands of the main and secondary screens can be about 1.9, so as to reduce the frequency deviation problem of the two corresponding antenna branch bands after folding.
  • the first antenna A1 can simultaneously operate in one or more frequency bands such as N78, WIFI2.4G and MHB.
  • the antenna length L1 is equal to a quarter wavelength of the working frequency band of the third antenna A3, and the working frequency band of the third antenna A3 includes the GPSL1 frequency band;
  • L1 is the length from the end point of the third antenna A3 close to the first antenna A1 to the fourth position.
  • the third antenna A3 may be designed to operate in the GPSL1 frequency band, and thus the antenna length of the third antenna A3 may be reasonably designed.
  • the antenna length L1 on the third antenna A3 is the length from the end point close to the first antenna A1 to the lower point.
  • the length of L1 can be designed to be equal to the resonant frequency band of the third antenna A3, i.e., one quarter wavelength of the GPSL1 frequency band.
  • the antenna structure can operate in the GPSL1 frequency band to meet the use requirements of the electronic device in the GPSL1 frequency band.
  • the first antenna A1 of the main screen near the hinge is designed to be a relatively high frequency band, such as the MHB band and the N78 band, or the WIFI2.4G/5G band, etc.
  • the second parasitic antenna A2 of the secondary screen near the hinge is designed to be a relatively low frequency band, such as the GPSL5 band or the low-frequency LB band, so that the frequency ratio of the two is 1.9, as shown in FIG15, to reduce the frequency deviation problem of the two corresponding antenna branch frequency bands after folding.
  • the frequency band scheme is used on the folding screen, not only the MHB band of the first antenna A1 is only within 30MHz to 40MHz, as shown in FIG16a, but also the original frequency deviation of the GPSL5 band of the second antenna A2 between the unfolded state and the folded state is controlled within 25MHz, as shown in FIG16b.
  • the frequency deviation of GPSL5 band after matching can be further reduced to less than 5M in the unfolded and folded states, as shown in Figure 16c.
  • the first antenna A1 can work in the N78, WIFI2.4G and MHB frequency bands at the same time
  • the second antenna A2 can work in the GPSL5 frequency band
  • the third antenna A3 can work in the GPSL1 frequency band. This not only enriches the working frequency band of the antenna structure, but also greatly reduces the frequency deviation problem of the two corresponding antenna branch frequency bands after the electronic device is folded.
  • the antenna structure further includes a second matching circuit M2;
  • the second feed source F2 is connected to a sixth position on the second antenna A2 far away from the first antenna A1, one end of the second matching circuit M2 is connected to the sixth position, and the other end is grounded;
  • the second matching circuit M2 includes a third inductor and a third capacitor connected in series.
  • a feeding point and an LC matching circuit may be provided on the second antenna A2 to reduce the influence of the second antenna A2 on the first antenna A1.
  • L in the LC matching circuit represents inductance
  • C represents capacitance.
  • a second feed source F2 and a second matching circuit M2 are connected at a sixth position on the second antenna A2 away from the first antenna A1.
  • the second matching circuit M2 is an LC series circuit in which a third inductor L3 and a third capacitor C3 are connected in series.
  • the second antenna A2 branch shown in FIG9a induces a high-order harmonic, namely, a parasitic branch current 9 (I9), in the N78 frequency band of the first antenna A1, which is opposite to the current 10 (I10) generated in the N78 frequency band of the first antenna A1 in the folded state. Therefore, the complex LC matching of the second matching circuit M2 can be used to tune the clutter of the parasitic current out of the band.
  • the LC matching in the second matching circuit M2 it is equivalent to a capacitor in the GPSL5 frequency band and equivalent to a large capacitor or 0 ohm in the N78 frequency band.
  • the influence of the second antenna A2 on the first antenna A1 can be greatly reduced in the folded state, thereby improving the efficiency of the first antenna A1.
  • the antenna structure further includes a third feed source F3 and a third matching circuit M3;
  • the third feed source F3 is connected to the seventh position of the third antenna A3 close to the first antenna A1, one end of the third matching circuit M3 is connected to the seventh position, and the other end is grounded;
  • the third matching circuit M3 includes a fourth inductor and a fourth capacitor connected in series.
  • a feeding point and an LC matching circuit may be provided on the third antenna A3 to solve the isolation problem between the counterpart antennas, i.e., the third antenna A3 and the first antenna A1, in the high frequency band (High Band, HB).
  • the third feed source F3 and the third matching circuit M3 are connected at the seventh position of the third antenna A3 close to the first antenna A1.
  • the third matching circuit M3 is an LC series circuit in which a fourth inductor L4 and a fourth capacitor C4 are connected in series.
  • the third antenna A3 and the first antenna A1 are opposite antennas on both sides of the gap. Because there is no ground connection in the middle, the isolation is generally poor.
  • the third matching circuit M3 shown in Figure 6b is a series resonant ground circuit of inductor L and capacitor C, which is equivalent to 0 ohm ground connection in the HB band of the first antenna A1 and equivalent to capacitor ground connection in the GPSL1 band.
  • the optimized isolation is at worst -18dB, which can meet the RF isolation requirements, but also can control the efficiency peak position of the first antenna A1 in the HB band by adjusting the resonant position of the third matching circuit M3.
  • the current of the HB of the first antenna A1 is actually the opposite co-directional half-wave mode shown in Figure 5a.
  • the isolation problem between the third antenna A3 and the first antenna A1 at HB can be solved, and the efficiency of the first antenna A1 can be improved by adjusting the resonance position of the third matching circuit M3.
  • the antenna structure further includes a fourth matching circuit M4;
  • One end of the fourth matching circuit M4 is connected to the eighth position of the fourth antenna A4 close to the second antenna A2, and the other end is grounded;
  • the fourth matching circuit M4 includes a fourth branch and a fifth branch connected in parallel, the fourth branch includes a fifth inductor and a fifth capacitor connected in series, and the fifth branch includes a sixth inductor.
  • an LC matching circuit may be provided on the fourth antenna A4 to reduce the effect of the fourth antenna A4 on the efficiency of the first antenna A1.
  • the fourth matching circuit M4 is connected to the eighth position of the fourth antenna A4 close to the second antenna A2.
  • the fourth matching circuit M4 is an LC series-parallel circuit, specifically a fifth inductor L5 and a fifth capacitor C5 connected in series, and then connected in parallel with a sixth inductor L6 .
  • the current mode of the first antenna A1 in the folded state is consistent with the current mode of the unfolded state shown in FIG5a, but after the foldable electronic device 10 is folded, the distance between the secondary screen 112 and the main screen 111 is very close. Due to the principle of inductive current, the closer the passive branch is to the active branch, the stronger the inductive resonant current will be excited (similar to the feeding branch in the current conventional electronic device design that can excite the current of the corresponding passive parasitic branch).
  • the branch of the fourth antenna A4 generates more than one self-resonant high-order harmonic near the HB frequency band of the first antenna A1, that is, the reverse parasitic branch current 8 (I8), and the parasitic current 8 on the right half is opposite to the current 2 (I2) in the B40 and B41 frequency bands in the unfolded state. If the parasitic current 8 on the right half falls within the B40 and B41 frequency bands, the efficiency of the first antenna A1 will be reduced.
  • the fourth matching circuit M4 equivalent to 0 ohms or a large capacitor grounded when matching in the B40 and B41 frequency bands, so as to move the resonant frequency of the parasitic current 8 on the right half to a frequency higher than 2.7 GHz, thereby reducing its impact on the efficiency of the first antenna A1.
  • the current of GPSL1 of the third antenna A3 of the main screen 111 in the folded state is consistent with the current direction in the unfolded state shown in FIG5b , and the parasitic current mode of the auxiliary screen 112 is matched to GPSL1 through the fourth matching circuit M4, which is equivalent to a small capacitor, and its parasitic resonant frequency is pulled to around 1.75 GHz, as shown in the Smith chart of GPSL1 in the folded state in FIG10b .
  • the parasitic resonant current at 1.75GHz is opposite to the current 3 (I3) of the third antenna A3 in GPSL1, but in the frequency band of 1.55GHz to 1.65GHz, the phase of the parasitic resonant current of the second antenna A2 is just turned 180°, as shown by the current 7 (I7) in Figure 9b.
  • the parasitic resonant current 7 (I7) of the second antenna A2 and the current 3 (I3) of the third antenna A3 in GPSL1 are in the same direction, thereby increasing the antenna radiation aperture efficiency, and improving the efficiency of the GPSL1 antenna after folding by about 1dB, as shown in the folded state efficiency of GPSL1 in Figure 12b.
  • the isolation of the first antenna A1, the second antenna A2 and the third antenna A3 in the folded state is shown in Figure 11.
  • the following takes the first antenna A1 working in the N78, WIFI2.4G and MHB frequency bands (i.e., B3, B39, B1, B40, WIFI2.4G and B41 frequency bands), the second antenna A2 working in the GPSL5 frequency band, and the third antenna A3 working in the GPSL1 frequency band as an example, and combines the drawings in the embodiments of the present application to further illustrate the embodiments of the present application:
  • the antenna structure has antenna lengths L1 , L2 , L3 , L4 , L5 , L6 , L7 and L8 , and each antenna length is reasonably designed according to the operating frequency band of each antenna.
  • the first antenna A1 is in the inverted-F antenna (IFA) mode shown by curve 1 in FIG. 5a in the B1, B3 and B39 frequency bands, and generates a current 1 (I1) in this mode, which is determined by the common length of L3+L4 shown in FIG. 1, and the length of L3+L4 is generally a quarter wavelength of its resonant frequency band; in the B40, B41 and WIFI2.4G frequency bands, it is in the co-directional half-wave mode shown by curve 2 in FIG. 5a, which is determined by the common length of L3+L2+L1 shown in FIG.
  • IFA inverted-F antenna
  • L3+L2+L1 is generally a half wavelength of its resonant frequency band; in the N78 frequency band, it is the monopole mode shown by curve 3 in FIG. 5a, which is also determined by the length of L3 shown in FIG. 1, and the length of L3 is generally a quarter wavelength of its resonant frequency band.
  • the Smith chart of the first antenna A1 in the unfolded state is shown in FIG. 7a, and its efficiency is shown in FIG. 8a.
  • the second antenna A2 operates in the GPS L5 frequency band, which is the IFA mode shown in Figure 5c, and is determined by the length of L5 shown in Figure 1.
  • the length of L5 is generally one quarter of the wavelength of its resonant frequency band.
  • the Smith chart of the second antenna A2 in the unfolded state is shown in Figure 7c, and its efficiency is shown in Figure 8c.
  • the third antenna A3 operates in the GPS L1 frequency band, which is the IFA mode shown in Figure 5b, and is determined by the length of L1 shown in Figure 1.
  • the length of L1 is generally one quarter of the wavelength of its resonant frequency band.
  • the Smith chart of the third antenna A3 in the unfolded state is shown in Figure 7b, and its efficiency is shown in Figure 8b.
  • the embodiment of the present application refers to the basic principle of the folding dipole and adopts a new design method for GPSL5, namely the dipole IFA antenna, which can not only improve the efficiency of GPSL5 in the folded state, but also further improve the efficiency of GPSL5 in the unfolded state after the foldable electronic device 10 is unfolded.
  • the dipole IFA antenna is actually two IFA antennas, which are placed side by side on both sides of the hinge through a hinge.
  • the first matching circuit M1 of the first antenna A1 switches through the first branch and the third branch through a switch.
  • This state can be called switch state 1, and the parasitic resonance frequency of the first antenna A1 itself is moved to 1.12 GHz, forming the dipole IFA current shown in FIG. 13a within the GPSL5 band.
  • the second antenna A2 generates a current 5 (I5)
  • the first antenna A1 generates a current 4 (I4).
  • the principle is the same as the current of the branch on the other side of the unfolded conventional dipole shown in FIG.
  • the first matching circuit M1 of the first antenna A1 After the foldable electronic device 10 is folded, if the first matching circuit M1 of the first antenna A1 still adopts switch state 1, in principle, the current of the dipole IFA after folding is as shown in FIG. 13b, which is the same as the current of the conventional dipole after folding in FIG. 14b. At this time, the current is opposite, which will only reduce the efficiency of the GPSL5 antenna of the secondary screen. In the embodiment of the present application, another approach is taken.
  • the switch of the first matching circuit M1 of the first antenna A1 switches the first branch and the second branch. This state can be called switch state 2.
  • the parasitic resonant frequency of the first antenna A1 itself is moved to around 1.27 GHz, so that the frequency difference ⁇ f between f0 (1.27 GHz) and f1 (the resonant frequency of GPSL5 is 1.176 GHz) can make the current phase ⁇ in the GPSL5 band reverse by 180°, forming the same-direction current distribution of the dipole IFA antenna in the folded state as shown in FIG13c.
  • the advantage of this design is that it ensures that GPSL5 can still achieve the performance of GPSL5 designed as the main screen antenna in the extremely poor environment of the angle between the two screens.
  • the embodiment of the present application rationally plans and arranges the frequency bands of the first antenna A1, the third antenna A3, and the second antenna A2.
  • the first antenna A1 on the main screen near the hinge is designed to be a relatively high frequency band, such as the MHB and N78 bands, or the WIFI2.4G/5G band, etc.
  • the parasitic antenna of the secondary screen near the hinge, i.e., the second antenna A2 is designed to be a relatively low frequency band, such as the GPSL5 band.
  • the frequency ratio between the two is 1.9, as shown in FIG15, to reduce the frequency deviation problem of the two corresponding antenna branch bands after folding.
  • the frequency band scheme layout of the present application is adopted on the folding screen, not only the MHB band of the first antenna A1 is only within 30MHz to 40MHz, as shown in FIG16a, but also the original frequency deviation of the GPSL5 of the second antenna A2 between unfolding and folding is controlled within 25MHz, as shown in FIG16b.
  • the frequency deviation of the matched GPSL5 in the unfolded and folded states can be further reduced to less than 5M, as shown in Figure 16c.
  • a foldable electronic device includes a folding screen and an antenna structure
  • the antenna structure includes: a first antenna, a second antenna, a first feed source, a second feed source and a first matching circuit; wherein the first antenna is arranged on the frame of the main screen of the folding screen, and the second antenna is arranged on the frame of the sub-screen of the folding screen, and the first antenna and the second antenna are both connected to a hinge, and the hinge is arranged between the main screen and the sub-screen; a first position on the first antenna close to the second antenna is grounded; the first feed source is connected to a second position on the first antenna far from the second antenna, one end of the first matching circuit is connected to the second position, and the other end is grounded; the second feed source is connected to the second antenna , a third position on the second antenna close to the first antenna is grounded; the first antenna and the second antenna operate in different frequency bands, the first matching circuit includes two tuning branches, one of which is used to tune the resonant frequency band of the first
  • a first matching circuit including two tuning branches on the antenna of the main screen of a foldable electronic device, not only can the resonant frequency band of the first antenna be tuned by one tuning branch when the electronic device is unfolded so that the first antenna and the second antenna generate current in the same direction, thereby improving the antenna efficiency in the unfolded state, but also when the electronic device is folded, the resonant frequency band of the first antenna can be tuned by another tuning branch to change the phase of the parasitic resonant current generated by the first antenna in the working frequency band of the second antenna so that it is in the same direction as the current generated by the second antenna, thereby increasing the antenna radiation aperture efficiency and improving the antenna efficiency in the folded state.

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Abstract

本申请提供了一种可折叠电子设备，属于通信技术领域。可折叠电子设备(10)的天线结构包括：第一天线（A1）、第二天线（A2）、第一馈源（F1）、第二馈源（F2）和第一匹配电路（M1）；第一天线（A1）设置在折叠屏(11)的主屏幕(111)的边框，第二天线（A2）设置在折叠屏(11)的副屏幕(112)的边框，第一天线（A1）与第二天线（A2）均与铰接件(12)连接，铰接件(12)设置在主屏幕(111)与副屏幕(112)之间；第一馈源(F1)与第一天线（A1）上远离第二天线（A2）的第二位置连接，第一匹配电路（M1）的一端与第二位置连接，另一端接地；第二馈源（F2）与第二天线（A2）连接；第一匹配电路（M1）中一个调谐支路用于调谐第一天线（A1）的谐振频段，使得展开状态下第一天线（A1）与第二天线（A2）产生的电流同向，另一个调谐支路用于调谐第一天线（A1）的谐振频段，使得折叠状态下第一天线（A1）与第二天线（A2）产生的电流同向。

Description

可折叠电子设备
相关申请的交叉引用
本申请主张在2023年03月31日在中国提交的中国专利申请No.202310338055.2的优先权，其全部内容通过引用包含于此。
技术领域
本申请属于通信技术领域，具体涉及一种可折叠电子设备。
背景技术
现有折叠屏电子设备中的天线设计方案，通常是将天线设计在主机身，在副机身加开关进行调谐，但是这不能彻底解决主机身布局空间不足的问题，而在副机身布局天线则面临很多挑战，如电子设备在折叠后的天线效率下降，天线之间的隔离度变差等问题，对此目前没有很好的解决方案。
发明内容
本申请实施例的目的是提供一种可折叠电子设备，能够解决现有折叠屏电子设备的天线效率较差的问题。
第一方面，本申请实施例提供了一种可折叠电子设备，包括折叠屏和天线结构，所述天线结构包括：第一天线、第二天线、第一馈源、第二馈源和第一匹配电路；
其中，所述第一天线设置在所述折叠屏的主屏幕的边框，所述第二天线设置在所述折叠屏的副屏幕的边框，所述第一天线与所述第二天线均与铰接件连接，所述铰接件设置在所述主屏幕与所述副屏幕之间；
所述第一天线上靠近所述第二天线的第一位置接地；
所述第一馈源与所述第一天线上远离所述第二天线的第二位置连接，所述第一匹配电路的一端与所述第二位置连接，另一端接地；
所述第二馈源与所述第二天线连接，所述第二天线上靠近所述第一天线的第三位置接地；
所述第一天线与所述第二天线工作在不同频段，所述第一匹配电路包括两个调谐支路，其中一个调谐支路用于调谐所述第一天线的谐振频段为第一频段，使得在所述折叠屏处于展开状态下时所述第一天线产生的寄生电流与所述第二天线产生的电流同向，另一个调谐支路用于调谐所述第一天线的谐振频段为第二频段，使得在所述折叠屏处于折叠状态下时所述第一天线产生的寄生电流与所述第二天线产生的电流同向，所述第一频段低于所述第二天线的工作频段，所述第二频段高于所述第二天线的工作频段。
在本申请实施例中，可折叠电子设备包括折叠屏和天线结构，该天线结构包括：第一天线、第二天线、第一馈源、第二馈源和第一匹配电路；其中，所述第一天线设置在所述折叠屏的主屏幕的边框，所述第二天线设置在所述折叠屏的副屏幕的边框，所述第一天线与所述第二天线均与铰接件连接，所述铰接件设置在所述主屏幕与所述副屏幕之间；所述第一天线上靠近所述第二天线的第一位置接地；所述第一馈源与所述第一天线上远离所述第二天线的第二位置连接，所述第一匹配电路的一端与所述第二位置连接，另一端接地；所述第二馈源与所述第二天线连接，所述第二天线上靠近所述第一天线的第三位置接地；所述第一天线与所述第二天线工作在不同频段，所述第一匹配电路包括两个调谐支路，其中一个调谐支路用于调谐所述第一天线的谐振频段为第一频段，使得在所述折叠屏处于展开状态下时所述第一天线产生的寄生电流与所述第二天线产生的电流同向，另一个调谐支路用于调谐所述第一天线的谐振频段为第二频段，使得在所述折叠屏处于折叠状态下时所述第一天线产生的寄生电流与所述第二天线产生的电流同向，所述第一频段低于所述第二天线的工作频段，所述第二频段高于所述第二天线的工作频段。这样，通过在可折叠电子设备主屏幕的天线上布设包括两个调谐支路第一匹配电路，不仅能够在电子设备展开时，通过一调谐支路调谐第一天线的谐振频段使得第一天线与第二天线产生同向电流，提升展开态下的天线效率，还能够在电子设备折叠时，通过另一调谐支路调谐第一天线的谐振频段，以改变第一天线在第二天线的工作频段内产生的寄生谐振电流的相位，使其与第二天线产生的电流同向，进而增大天线辐射口径效率，提升折叠态下的天线效率。
附图说明
图1是本申请实施例提供的可折叠电子设备的天线结构示意图之一；
图2是本申请实施例提供的可折叠电子设备在展开状态时的天线结构示意图；
图3是本申请实施例提供的可折叠电子设备在折叠状态时的天线结构示意图；
图4是本申请实施例提供的天线结构中第一匹配电路M1的电路结构示意图；
图5a～图5c是本申请实施例提供的展开状态下各天线的电流分布示意图；
图6a～图6c是本申请实施例提供的天线结构中各匹配电路的电路结构示意图；
图7a～图7c是本申请实施例提供的展开状态下各天线的史密斯圆图；
图7d是本申请实施例提供的展开状态下各天线的隔离度的示意图；
图8a～图8c是本申请实施例提供的展开状态下各天线的效率图；
图9a～图9c是本申请实施例提供的折叠状态下各天线电流分布示意图；
图10a～图10c是本申请实施例提供的折叠状态下各天线的史密斯圆图；
图11是本申请实施例提供的折叠状态下各天线的隔离度的示意图；
图12a～图12c是本申请实施例提供的折叠状态下各天线的效率图；
图13a～图13c是本申请实施例提供的GPSL5天线效率提升原理简化示意图；
图14a和图14b是本申请实施例提供的偶极子天线在不同状态下的电流分布示意图；
图15是本申请实施例提供的折叠状态下主副屏幕天线的频偏差随频率比的变化示意图；
图16a～图16c是本申请实施例提供的各天线在展开状态和折叠状态下的频偏示意图；
图17是本申请实施例提供的展开状态下第二天线的史密斯圆图；
图18a和图18b是本申请实施例提供的第二天线分别在展开状态和折叠状态下的效率图。
具体实施方式
下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行清楚地描述，显然，所描述的实施例是本申请一部分实施例，而不是全部的实施例。基于本申请中的实施例，本领域普通技术人员获得的所有其他实施例，都属于本申请保护的范围。
本申请的说明书和权利要求书中的术语“第一”、“第二”等是用于区别类似的对象，而不用于描述特定的顺序或先后次序。应该理解这样使用的数据在适当情况下可以互换，以便本申请的实施例能够以除了在这里图示或描述的那些以外的顺序实施，且“第一”、“第二”等所区分的对象通常为一类，并不限定对象的个数，例如第一对象可以是一个，也可以是多个。此外，说明书以及权利要求中“和/或”表示所连接对象的至少其中之一，字符“/”，一般表示前后关联对象是一种“或”的关系。
下面结合附图，通过具体的实施例及其应用场景对本申请实施例提供的天线结构进行详细地说明。
请参见图1、图2和图3，图1为本申请实施例提供的可折叠电子设备的天线结构示意图，图2和图3为本申请实施例提供的天线结构在可折叠电子设备中的结构示意图，如图所示，该可折叠电子设备10包括折叠屏11和天线结构，所述天线结构包括：第一天线A1、第二天线A2、第一馈源F1、第二馈源F2和第一匹配电路M1；
其中，所述第一天线A1设置在所述折叠屏11的主屏幕111的边框，所述第二天线A2设置在所述折叠屏的副屏幕112的边框，所述第一天线A1与所述第二天线A2均与铰接件12连接，所述铰接件12设置在所述主屏幕111与所述副屏幕112之间；
所述第一天线A1上靠近所述第二天线A2的第一位置接地；
所述第一馈源F1与所述第一天线A1上远离所述第二天线A2的第二位置连接，所述第一匹配电路M1的一端与所述第二位置连接，另一端接地；
所述第二馈源F2与所述第二天线A2连接，所述第二天线A2上靠近所述第一天线A1的第三位置接地；
所述第一天线A1与所述第二天线A2工作在不同频段，所述第一匹配电路M1包括两个调谐支路，其中一个调谐支路用于调谐所述第一天线A1的谐振频段为第一频段，使得在所述折叠屏11处于展开状态下时所述第一天线A1产生的寄生电流与所述第二天线A2产生的电流同向，另一个调谐支路用于调谐所述第一天线A1的谐振频段为第二频段，使得在所述折叠屏11处于折叠状态下时所述第一天线A1产生的寄生电流与所述第二天线A2产生的电流同向，所述第一频段低于所述第二天线A2的工作频段，所述第二频段高于所述第二天线A2的工作频段。
上述第一天线A1和第二天线A2可以是金属边框天线，作为天线的辐射本体。如图2和图3所示，所述第一天线A1设置在可折叠电子设备10的主屏幕111的边框1111，所述第二天线A2则设置在可折叠电子设备10的副屏幕112的边框1121，且所述第一天线A1与所述第二天线A2均与铰接件12连接，所述第一天线A1和所述第二天线A2上均连接有馈源，且都设有下地点，即所述第一天线A1与所述第二天线A2可以并排设置在铰接件12的两侧，构成偶极倒F天线(Inverted-F antenna，IFA)。其中，所述铰接件12可以是折叠屏中的铰链，是用于将大屏幕进行折叠或者展开支撑用的关键零件，也是将主屏幕金属中框和副屏幕金属中框连接一起的关键零件。
如图1所示，所述第一天线A1上靠近所述第二天线A2的第一位置接地，所述第二天线A2上靠近所述第一天线A1的第三位置接地，即所述第一天线A1和所述第二天线A2上均设有天线下地位，用于将可折叠电子设备10外侧的中框天线连接可折叠电子设备10内部的中框地上。
所述第一天线A1上远离所述第二天线A2的第二位置连接有第一馈源F1，所述第一馈源F1为天线馈电，用于将可折叠电子设备10的射频功率信号传递到所述第一天线A1本体上。
所述第二天线A2上连接有第二馈源F2，所述第二馈源F2为天线馈电，用于将可折叠电子设备10的射频功率信号传递到所述第二天线A2本体上。
所述第一天线A1上所述第二位置处还连接有第一匹配电路M1，且所述第一匹配电路M1包括两个调谐支路，分别用于在可折叠电子设备10的展开状态和折叠状态下调谐所述第一天线A1的谐振频率。具体地，其中一调谐支路用于在可折叠电子设备10处于展开状态时，调谐所述第一天线A1的谐振频率，将所述第一天线A1的寄生谐振频率拉到比所述第二天线A2的工作频段的中心频率还低的频点，即使所述第一天线A1的寄生谐振频段比所述第二天线A2的工作频段低，使得所述第一天线A1在所述第二天线A2的工作频段内产生的寄生电流与所述第二天线A2产生的电流同向，形成同向偶极电流，以此来提高所述第二天线A2在展开态的效率；另一调谐支路则用于在可折叠电子设备10处于折叠状态时，调谐所述第一天线A1的谐振频率，将所述第一天线A1的寄生谐振频率拉到比所述第二天线A2的工作频段的中心频率还高的频点，即使所述第一天线A1的寄生谐振频段比所述第二天线A2的工作频段高，使得所述第一天线A1在所述第二天线A2的工作频段内产生的寄生谐振电流反向180度，进而使其与所述第二天线A2的电流同向，形成同向偶极电流，以此来提高所述第二天线A2在折叠态的效率。
本实施例中，可以设计所述第一天线A1和所述第二天线A2分别工作在不同的频段，例如，所述第一天线A1可以工作在稍高的频段，如N78频段、WIFI2.4G频段、中高频段(Middle High Band，MHB)等，所述第二天线A2则可以工作在较低频段，如GPSL5频段。GPS是指全球定位系统(Global Positioning System)。
具体地，在可折叠电子设备10处于折叠状态时，副屏幕112上所述第二天线A2在折叠态下的电流和图5c所示展开态的电流方向一致。所述第一天线A1在所述第二天线A2的工作频段如GPSL5频段等效于开路或者小电容下地，主屏幕111上所述第一天线A1的谐振频率将移到1.27GHz附近，如图10c所示的折叠态GPSL5的史密斯圆图。此时所述第一天线A1的谐振电流的相位在GPSL5频段内转向180°，其电流方向如图9c的电流6(I6)所示，从而在GPSL5频段内，所述第一天线A1的寄生谐振电流6(I6)和所述第二天线A2在GPSL5的电流5(I5)同向，进而增大天线辐射口径效率，对折叠态后所述第二天线A2工作在GPSL5频段的天线效率提升约1.5dB，如图12c所示的GPSL5的折叠态效率。
在可折叠电子设备10处于展开状态时，对所述第二天线A2的工作频段如GPSL5频段来说相当于新增加一个寄生辅助谐振，如图7c所示，可将该谐振拉到比GPSL5还低的频点1.12GHz附近，如图8c所示，对展开态于GPSL5频段的效率可提升1dB～1.5dB。
可选地，所述天线结构还包括第三天线A3和第四天线A4；
其中，所述第三天线A3设置在所述主屏幕111的边框，且与所述第一天线A1之间具有间隙；所述第四天线A4设置在所述副屏幕112的边框，且与所述第二天线A2之间具有间隙；
所述第三天线A3上远离所述第一天线A1的第四位置接地；
所述第四天线A4上远离所述第三天线A3的第五位置接地。
一种实施方式中，可在可折叠电子设备10的主屏幕111和副屏幕112分别布设多根天线，以获得更多天线工作模式。具体地，还可在所述主屏幕111的边框于所述第一天线A1的旁侧并排布置第三天线A3，以及在所述副屏幕112的边框于所述第二天线A2的旁侧并排布置第四天线A4，且所述第三天线A3与所述第一天线A1之间具有间隙，所述第四天线A4与所述第二天线A2之间具有间隙，所述第三天线A3和所述第四天线A4上均设有天线下地位。
该实施方式中，可以设计所述第三天线A3工作在与所述第一天线A1和所述第二天线A2不同的频段，如GPSL1频段。所述第四天线A4则设计为寄生枝节，在展开态上无实际作用，在折叠态下产生高次谐波和反向寄生电流，通过调谐匹配电路降低对所述第一天线A1的效率影响。
可选地，所述第一匹配电路M1包括并联的第一支路、第二支路和第三支路，所述第一支路包括串联的第一电容C1和第一电感L1，所述第二支路包括串联的第二电感L2和第一开关S1，所述第三支路包括串联的第二电容C2和第二开关S2；
在所述折叠屏11处于展开状态时，所述第一开关S1处于断开状态，所述第二开关S2 处于闭合态，所述第一天线A1的谐振频段被调谐为第一频段，使得所述展开状态下所述第一天线A1产生的寄生电流与所述第二天线A2产生的电流同向；在所述折叠屏11处于折叠状态时，所述第一开关S1处于闭合状态，所第二开关S2处于断开状态，所述第一天线A1的谐振频段被调谐为第二频段，使得所述折叠状态下所述第一天线A1产生的寄生电流与所述第二天线A2产生的电流同向。
一种实施方式中，所述第一匹配电路M1可以如图4所示，即包括三个并联支路，分别为电容电感串联支路、开关控制的电感支路和开关控制的电容支路，其中，所述第一支路也即电容电感串联支路和所述第二支路也即开关控制的电感支路组成一调谐支路，用于折叠态下对所述第一天线A1进行调谐，所述第一支路也即电容电感串联支路和所述第三支路也即开关控制的电容支路组成另一调谐支路，用于展开态下对所述第一天线A1进行调谐，这样，可以根据可折叠电子设备10的折叠屏11所处的不同状态，来控制支路开关的通断，从而切换不同的调谐支路来保证天线工作效率。
具体地，在所述折叠屏11处于展开状态时，可以控制所述第二支路的第一开关S1处于断开状态，所述第三支路的第二开关S2处于连通状态，使得该状态下对所述第二天线A2的工作频段(如GPSL5频段)来说相当于新增加一个寄生辅助谐振，如图7c所示，可将该谐振拉到比GPSL5还低的频点1.12GHz附近，如图8c所示，对展开态于GPSL5频段的效率可提升1dB～1.5dB。
在所述折叠屏11处于折叠状态时，可以控制所述第二支路的第一开关S1处于连通状态，所述第三支路的第二开关S2处于断开状态，来提升折叠态下所述第二天线A2在GPSL5频段的效率。从图9c所示，副屏幕112上所述第二天线A2的GPSL5在折叠态下的电流和图5c所示展开态的电流方向一致，但是此时所述第一匹配电路M1需要切换成第一开关为连通状态，第二开关为断开状态。所述第一天线A1在所述第二天线A2的工作频段如GPSL5频段等效于开路或者小电容下地，主屏幕111上所述第一天线A1的谐振频率将移到1.27GHz附近，如图10c所示的折叠态GPSL5的史密斯圆图。此时所述第一天线A1的谐振电流的相位在GPSL5频段内转向180°，其电流方向如图9c的电流6(I6)所示，从而在GPSL5频段内，所述第一天线A1的寄生谐振电流6(I6)和所述第二天线A2在GPSL5的电流5(I5)同向，进而增大天线辐射口径效率，对折叠态后所述第二天线A2工作在GPSL5频段的天线效率提升约1.5dB，如图12c所示的GPSL5的折叠态效率。
这样，该实施方式中，通过根据电子设备折叠状态，切换所述第一天线A1上的匹配电路的接入支路，既可提升所述天线结构在展开状态下的天线效率，以及优化天线间隔离度，还可提升所述天线结构在折叠状态下的天线效率。
需说明的是，一种实施方式中，为了仅保证折叠态下的天线效率，所述第一匹配电路M1可以仅包括第一支路和第二支路，在可折叠电子设备10处于展开态下，所述第一天线A1的寄生电流和所述第二天线A2在GPSL5的电流相反，降低了展开态的所述第二天线A2在GPSL5的效率。但是该实施方式下的第二电感相比所述第一匹配电路M1还包括第三支路情况下的电感更小，在可折叠电子设备10的折叠状态下，所述第一天线A1的寄生电流谐振频点移到1.33GHz～1.38GHz，如图17所示。展开态的GPSL5的效率相比原始的无寄生谐振的效率会降低0.5dB，如图18a所示，折叠态的GPSL5效率则与所述第一匹配电路M1还包括第三支路的情况相当，如图18b所示。即改进后的GPSL5折叠态效率也能提升1dB，而且能够省去所述第一匹配电路M1中增设天线开关的成本。
可选地，天线长度L1、天线间隙长度L2与天线长度L3的长度和等于所述第一天线A1的第一工作频段的二分之一波长，所述第一工作频段包括WIFI2.4G频段；
天线长度L5等于所述第二天线A2的工作频段的四分之一波长，所述第二天线A2的工作频段包括GPSL5频段；
其中，L1为所述第三天线A3靠近所述第一天线A1的端点到所述第四位置的长度，L2为所述第一天线与所述第三天线之间的间隙长度，L3为所述第一天线A1远离所述第二天线A2的端点到所述第二位置的长度，L5为所述第二天线A2远离所述第一天线A1的端点到所述第三位置的长度。
一种实施方式中，可以设计所述第一天线A1工作在WIFI2.4G频段，所述第二天线A2工作在GPSL5频段，因此可以合理设计所述第一天线A1、所述第二天线A2和所述第三天线A3上的天线长度，以及所述第一天线A1与所述第三天线A3之间的间隙长度。当然所述第一天线A1还可以工作在其他频段。
具体地，如图1所示，所述第三天线A3上的天线长度L1为下地点到靠近所述第一天线A1的端点之间的长度，L2为所述第一天线A1与所述第三天线A3之间的间隙，所述第一天线A1上的天线长度L3为靠近所述第三天线A3的端点到馈电点之间的长度。为使所述第一天线A1能够工作在WIFI2.4G频段，可以设计L1+L2+L3的长度等于所述第一天线A1的谐振频段即WIFI2.4G频段的二分之一波长。
所述第二天线A2上的天线长度L5为远离所述第一天线A1的端点到下地点之间的长度。为使所述第二天线A2能够工作在GPSL5频段，可以设计L5的长度等于所述第二天线A2的谐振频段即GPSL5频段的四分之一波长。
这样，通过合理设计各天线长度，可以确保主屏幕天线能够工作在WIFI2.4G频段，副屏幕天线工作在GPSL5频段，从而能够使主副屏幕的天线频段的频率比为1.9左右，以减少折叠后两个对应天线枝节频段的频偏问题。
可选地，天线长度L3与天线长度L4的长度和等于所述第一天线A1的第二工作频段的四分之一波长，所述第二工作频段包括中高频段(Middle high band，MHB)；
天线长度L5等于所述第二天线A2的工作频段的四分之一波长，所述第二天线A2的工作频段包括GPSL5频段；
其中，L3为所述第一天线A1远离所述第二天线A2的端点到所述第二位置的长度，L4为所述第二位置到所述第一位置的长度，L5为所述第二天线A2远离所述第一天线A1的端点到所述第三位置的长度。
一种实施方式中，可以设计所述第一天线A1还可工作在MHB频段，所述第二天线A2工作在GPSL5频段，因此可以合理设计所述第一天线A1和所述第二天线A2上的天线长度。
具体地，如图1所示，所述第一天线A1上的天线长度L3为靠近所述第三天线A3的端点到馈电点之间的长度，所述第一天线A1上的天线长度L4为馈电点到下地点之间的长度。为使所述第一天线A1能够工作在MHB频段，如B1、B3和B39频段，可以设计L3+L4的长度等于所述第一天线A1的谐振频段(如B1、B3和B39频段中的最高频段)的四分之一波长。
所述第二天线A2上的天线长度L5为远离所述第一天线A1的端点到下地点之间的长度。为使所述第二天线A2能够工作在GPSL5频段，可以设计L5的长度等于所述第二天线A2的谐振频段即GPSL5频段的四分之一波长。
这样，通过合理设计各天线长度，可以确保主屏幕天线还能够工作在MHB频段，副屏幕天线工作在GPSL5频段，从而能够使主副屏幕的天线频段的频率比为1.9左右，以减少折叠后两个对应天线枝节频段的频偏问题。
可选地，天线长度L3等于所述第一天线A1的第三工作频段的四分之一波长，所述第三工作频段包括N78频段；
天线长度L5等于所述第二天线A2的工作频段的四分之一波长，所述第二天线A2的工作频段包括GPSL5频段；
其中，L3为所述第一天线A1远离所述第二天线A2的端点到所述第二位置的长度，L5为所述第二天线A2远离所述第一天线A1的端点到所述第三位置的长度。
一种实施方式中，可以设计所述第一天线A1还可工作在N78频段，所述第二天线A2工作在GPSL5频段，因此可以合理设计所述第一天线A1和所述第二天线A2的天线长度。
具体地，如图1所示，所述第一天线A1上的天线长度L3为靠近所述第三天线A3的端点到馈电点之间的长度。为使所述第一天线A1能够工作在N78频段，可以设计L3的长度等于所述第一天线A1的谐振频段即N78频段的四分之一波长。
所述第二天线A2上的天线长度L5为远离所述第一天线A1的端点到下地点之间的长度。为使所述第二天线A2能够工作在GPSL5频段，可以设计L5的长度等于所述第二天线A2的谐振频段即GPSL5频段的四分之一波长。
这样，通过合理设计各天线长度，可以确保主屏幕天线还能够工作在N78频段，副屏幕天线工作在GPSL5频段，从而能够使主副屏幕的天线频段的频率比为1.9左右，以减少折叠后两个对应天线枝节频段的频偏问题。
也就是说，一种实施方式中，通过合理设计各天线长度L1、L2、L3和L4，可以使所述第一天线A1同时工作在N78、WIFI2.4G和MHB频段等中的一个或多个频段。
可选地，天线长度L1等于所述第三天线A3的工作频段的四分之一波长，所述第三天线A3的工作频段包括GPSL1频段；
其中，L1为所述第三天线A3靠近所述第一天线A1的端点到所述第四位置的长度。
一种实施方式中，可以设计所述第三天线A3工作在GPSL1频段，因此可以合理设计所述第三天线A3的天线长度。
具体地，如图1所示，所述第三天线A3上的天线长度L1为靠近所述第一天线A1的端点到下地点之间的长度。为使所述第三天线A3能够工作在GPSL1频段，可以设计L1的长度等于所述第三天线A3的谐振频段即GPSL1频段的四分之一波长。
这样，通过合理设计各天线长度，可以确保所述天线结构能够工作在GPSL1频段，以满足所述电子设备在GPSL1频段的使用需求。
需说明的是，通过对所述第一天线A1、所述第二天线A2和所述第三天线A3的工作频段进行合理规划布局，将靠近铰链一侧的主屏第一天线A1设计成频率比较高的频段，如MHB频段和N78频段，或者加WIFI2.4G/5G频段等，靠近铰链一侧的副屏寄生第二天线A2设计成频率比较低的频段，如GPSL5频段或者低频LB频段，使两者频率比为1.9，如图15所示，来减少折叠后两个对应天线枝节频段的频偏问题。因为在折叠屏上采用上述频段方案布局，所以不仅第一天线A1的MHB频段只频偏30MHz～40MHz以内，如图16a所示，而且将第二天线A2的GPSL5频段在展开态和折叠态之间的原始频偏控制在25MHz以内，如图16b所示。合理的频段方案布局再加上应用偶极IFA天线的匹配和方案设计，匹配后的GPSL5频段在展开态和折叠态后的频偏能更进一步缩小到5M以内，如图16c所示。
也就是说，通过合理设计各天线L1、L2、L3、L4和L5的长度，可以使所述第一天线A1同时工作在N78、WIFI2.4G和MHB频段，使所述第二天线A2工作在GPSL5频段，使所述第三天线A3工作在GPSL1频段，从而不仅能够丰富所述天线结构的工作频段，而且能够极大减少电子设备折叠后两个对应天线枝节频段的频偏问题。
可选地，所述天线结构还包括第二匹配电路M2；
所述第二馈源F2与所述第二天线A2上远离所述第一天线A1的第六位置连接，所述第二匹配电路M2的一端与所述第六位置连接，另一端接地；
所述第二匹配电路M2包括串联的第三电感和第三电容。
一种实施方式中，可在所述第二天线A2上设置馈电点和LC匹配电路，用于降低所述第二天线A2对所述第一天线A1的影响。LC匹配电路中的L表示电感，C表示电容。具体地，如图1所示，所述第二天线A2上远离所述第一天线A1的第六位置连接第二馈源F2和第二匹配电路M2，如图6a所示，所述第二匹配电路M2为第三电感L3和第三电容C3串联的LC串联电路。
可折叠电子设备10在折叠状态下，图9a所示的第二天线A2枝节在第一天线A1的N78频带内感应出了一个高次谐波即寄生枝节电流9(I9)，和折叠态下第一天线A1的N78频段产生的电流10(I10)相反，因此可采用第二匹配电路M2的复杂LC匹配将寄生电流的杂波调出带外。通过所述第二匹配电路M2中的LC匹配，在GPSL5频段内等效于电容，在N78频段内等效于大电容或者0欧姆，除了对GPSL5起阻抗匹配作用，在折叠态时可用来将反向左半边的寄生枝节电流9(I9)的谐振频率移到比3.3GHz还低的频率，以减少其寄生电流对第一天线A1在N78频段的影响。综上所述的调试方式，所述第一天线A1的史密斯圆图如图10a所示，其折叠态效率如图12a所示。
这样，通过在第二天线A2上设置第二匹配电路M2，可在折叠态下极大减少所述第二天线A2对所述第一天线A1的影响，以此提高所述第一天线A1的效率。
可选地，所述天线结构还包括第三馈源F3和第三匹配电路M3；
所述第三馈源F3与所述第三天线A3上靠近所述第一天线A1的第七位置连接，所述第三匹配电路M3的一端与所述第七位置连接，另一端接地；
所述第三匹配电路M3包括串联的第四电感和第四电容。
一种实施方式中，可在所述第三天线A3上设置馈电点和LC匹配电路，用于解决对口天即所述第三天线A3和所述第一天线A1之间在高频段(High Band，HB)的隔离度问题。具体地，如图1所示，所述第三天线A3上靠近所述第一天线A1的第七位置连接第三馈源F3和第三匹配电路M3，如图6b所示，所述第三匹配电路M3为第四电感L4和第四电容C4串联的LC串联电路。
如图1所示，所述第三天线A3和所述第一天线A1为断缝两边对口天线，因为中间无下地，所以一般隔离度较差。图6b所示的第三匹配电路M3为电感L和电容C的串联谐振下地电路，其在所述第一天线A1的HB频段内等效于0欧姆下地，在GPSL1频段内等效于电容下地，从而不仅可解决所述第三天线A3和所述第一天线A1之间在HB的隔离度问题，如图7d所示，优化后的隔离度最差为-18dB，可满足射频隔离度要求，而且还可以通过调整所述第三匹配电路M3的谐振位置来控制所述第一天线A1在HB频段的效率峰值位置。其中，所述第一天线A1的HB的电流实际为图5a所示的对口同向半波模态。
这样，通过在第三天线A3上设置第三匹配电路M3，可解决所述第三天线A3和所述第一天线A1之间在HB的隔离度问题，还可通过调整所述第三匹配电路M3的谐振位置来提高所述第一天线A1的效率。
可选地，所述天线结构还包括第四匹配电路M4；
所述第四匹配电路M4的一端与所述第四天线A4上靠近所述第二天线A2的第八位置连接，另一端接地；
所述第四匹配电路M4包括并联的第四支路和第五支路，所述第四支路包括串联的第五电感和第五电容，所述第五支路包括第六电感。
一种实施方式中，可在所述第四天线A4上设置LC匹配电路，用于减少所述第四天线A4对所述第一天线A1的效率影响。具体地，如图1所示，所述第四天线A4上靠近所述第二天线A2的第八位置连接第四匹配电路M4，如图6c所示，所述第四匹配电路M4为LC串并联电路，具体为第五电感L5与第五电容C5串联，再与第六电感L6并联。
在可折叠电子设备10处于折叠状态下，如图9a所示，所述第一天线A1在折叠态的电流模态和图5a所示展开的电流模态一致，但是可折叠电子设备10折叠后副屏幕112和主屏幕111的间距十分近，由于感应电流原理，无源枝节越靠近有源枝节，其本身会被激励起很强的感应谐振电流(类似于现在常规电子设备设计中的馈电枝节可以激励起对口无源寄生枝节的电流)。此时所述第四天线A4枝节在所述第一天线A1的HB频段附近产生了超过一个本身谐振的高次谐波，即反向的寄生枝节电流8(I8)，其右半边的寄生电流8与展开态的B40和B41频段的电流2(I2)相反。右半边的寄生电流8如果落在B40和B41频带内则会导致所述第一天线A1的效率降低，所以需要使所述第四匹配电路M4匹配在B40和B41频段时等效于0欧姆或者大电容下地，以将右半边的寄生电流8的谐振频率移到比2.7GHz更高的频率，减少其对所述第一天线A1的效率影响。
另外，从图9b所示，主屏幕111第三天线A3的GPSL1在折叠态下的电流和图5b所示展开态的电流方向一致，而副屏幕112寄生的电流模态通过所述第四匹配电路M4匹配在GPSL1等效于小电容，将其寄生谐振频率拉到1.75GHz附近，如图10b所示的折叠态GPSL1的史密斯圆图。1.75GHz处的寄生谐振电流和所述第三天线A3在GPSL1的电流3(I3)相反，但是在1.55GHz～1.65GHz频段内，所述第二天线A2的寄生谐振电流的相位刚好转向180°，如图9b的电流7(I7)所示，此时所述第二天线A2的寄生谐振电流7(I7)和所述第三天线A3在GPSL1的电流3(I3)同向，进而可增大天线辐射口径效率，对折叠态后的GPSL1天线效率可提升1dB左右，如图12b所示的GPSL1的折叠态效率。所述第一天线A1、所述第二天线A2和所述第三天线A3在折叠态的隔离度如图11所示。
这样，通过在第四天线A4上设置第四匹配电路M4，不仅可在折叠态下极大减少所述第四天线A4对所述第一天线A1的影响，以此提高所述第一天线A1的效率，还可提高所述第三天线A3的GPSL1的效率。
本申请实施例中，通过各天线上的匹配电路，不仅解决对口天线第一天线A1和第三天线A3之间的隔离度问题，而且巧妙解决了主副屏之间展开和折叠状态下的第一天线A1、第二天线A2和第三天线A3间的互耦影响问题，保证了折叠和展开状态下的三个天线效率，使每个天线都处于性能最好状态。
下面以所述第一天线A1工作在N78、WIFI2.4G和MHB频段(即B3、B39、B1、B40、WIFI2.4G和B41频段)，所述第二天线A2工作在GPSL5频段，所述第三天线A3工作在GPSL1频段为例，结合本申请实施例中的附图，对本申请实施例作更进一步说明：
如图1所示，所述天线结构具有天线长度L1、L2、L3、L4、L5、L6、L7和L8，各天线长度根据各天线的工作频段进行合理设计。
可折叠电子设备10在展开状态下，所述第一天线A1在B1、B3和B39频段为图5a中曲线1所示的倒F天线(Inverted-F Antenna，IFA)模态，该模态下产生电流1(I1)，由图1所示的L3+L4两者共同长度所决定，L3+L4的长度一般为其谐振频段的四分之一波长；在B40、B41以及WIFI2.4G频段则处于图5a中曲线2所示的同向半波模态，由图1所示的L3+L2+L1的共同长度所决定，L3+L2+L1的长度一般为其谐振频段的二分之一波长；在N78频段是图5a中曲线3所示的单极子模态，也由图1所示的L3的长度所决定，L3的长度一般为其谐振频段的四分之一波长。所述第一天线A1在展开态的史密斯圆图如图7a所示，其效率如图8a所示。
所述第二天线A2工作在GPSL5频段,为图5c所示的IFA模态，由图1所示的L5长度所决定，L5的长度一般为其谐振频段的四分之一波长。所述第二天线A2在展开态的史密斯圆图如图7c所示，其效率如图8c所示。
所述第三天线A3工作在GPSL1频段，为图5b所示的IFA模态，由图1所示的L1长度所决定，L1的长度一般为其谐振频段的四分之一波长。所述第三天线A3在展开态的史密斯圆图如图7b所示，其效率如图8b所示。
目前大多数折叠屏天线方案，在电子设备屏幕折叠后，通过调谐副屏的LC匹配，将LC匹配上的寄生枝节变成同向电流来提升效率，类似于本申请实施例中的GPSL1的副寄生枝节，然后这种方案一旦屏幕展开，基本无提升效果。然而，本申请实施例参考折叠偶极子的基础原理，对GPSL5采用了一种新的设计方式，即偶极IFA天线，不仅可以在折叠态中，提升GPSL5折叠态的效率，而且在可折叠电子设备10展开后也能进一步提升GPSL5展开态的效率。偶极IFA天线，其实就是两个IFA天线，通过铰链，并排放置在铰链的两侧。可折叠电子设备10在展开后，第一天线A1的第一匹配电路M1通过开关切通第一支路和第三支路，此状态可称为开关状态1，将所述第一天线A1本身的寄生谐振频点移到1.12GHz，在GPSL5带内形成图13a所示偶极IFA电流，如图5c所示，所述第二天线A2产生电流5(I5)，所述第一天线A1产生电流4(I4)，其原理和图14a所示展开的常规偶极子的另一侧地枝节的电流一样，形成同向电流提升效率。可折叠电子设备10在折叠后，所述第一天线A1的第一匹配电路M1如果还采用开关状态1，从原理上来说偶极IFA在折叠后的电流为图13b所示，和图14b的常规偶极子在折叠后的电流一样，此时电流相反，只会降低副屏的GPSL5天线的效率。本申请实施例中另避蹊径，通过所述第一天线A1的第一匹配电路M1的开关切通第一支路和第二支路，此状态可称为开关状态2，将所述第一天线A1本身的寄生谐振频点移到1.27GHz附近，使得f0(1.27GHz)和f1(GPSL5的谐振频点1.176GHz)的频率差Δf能够使GPSL5带内的电流相位ΔΦ反向180°，形成如图13c所示折叠态下的偶极IFA天线的同向电流分布。此设计的优点是保证了GPSL5在两个屏幕夹角的极差环境下仍能达到把GPSL5设计到主屏天线的性能。其中Δf与ΔΦ的关系如下公式所示：
Δφ＝Δβ×L
此外本申请实施例对于所述第一天线A1、所述第三天线A3以及所述第二天线A2的频段合理规划布局，靠近铰链一侧的主屏上第一天线A1设计成频率比较高的频段，如MHB和N78频段，或者加WIFI2.4G/5G频段等，靠近铰链一侧的副屏寄生天线即第二天线A2设计成频率比较低的频段，如GPSL5频段，两者频率比为1.9，如图15所示，来减少折叠后两个对应天线枝节频段的频偏问题。因为在折叠屏上采用本申请的频段方案布局，所以不仅所述第一天线A1的MHB频段只频偏30MHz～40MHz以内，如图16a所示，而且把所述第二天线A2的GPSL5展开和折叠之间的原始频偏控制在25MHz以内，如图16b所示。合理的频段方案布局再加上应用偶极IFA的匹配和方案设计，匹配后的GPSL5在展开态和折叠态的频偏能更进一步缩小到5M以内，如图16c所示。
在本申请实施例中，可折叠电子设备包括折叠屏和天线结构，该天线结构包括：第一天线、第二天线、第一馈源、第二馈源和第一匹配电路；其中，所述第一天线设置在所述折叠屏的主屏幕的边框，所述第二天线设置在所述折叠屏的副屏幕的边框，所述第一天线与所述第二天线均与铰接件连接，所述铰接件设置在所述主屏幕与所述副屏幕之间；所述第一天线上靠近所述第二天线的第一位置接地；所述第一馈源与所述第一天线上远离所述第二天线的第二位置连接，所述第一匹配电路的一端与所述第二位置连接，另一端接地；所述第二馈源与所述第二天线连接，所述第二天线上靠近所述第一天线的第三位置接地；所述第一天线与所述第二天线工作在不同频段，所述第一匹配电路包括两个调谐支路，其中一个调谐支路用于调谐所述第一天线的谐振频段为第一频段，使得在所述折叠屏处于展开状态下时所述第一天线产生的寄生电流与所述第二天线产生的电流同向，另一个调谐支路用于调谐所述第一天线的谐振频段为第二频段，使得在所述折叠屏处于折叠状态下时所述第一天线产生的寄生电流与所述第二天线产生的电流同向，所述第一频段低于所述第二天线的工作频段，所述第二频段高于所述第二天线的工作频段。这样，通过在可折叠电子设备主屏幕的天线上布设包括两个调谐支路第一匹配电路，不仅能够在电子设备展开时，通过一调谐支路调谐第一天线的谐振频段使得第一天线与第二天线产生同向电流，提升展开态下的天线效率，还能够在电子设备折叠时，通过另一调谐支路调谐第一天线的谐振频段，以改变第一天线在第二天线的工作频段内产生的寄生谐振电流的相位，使其与第二天线产生的电流同向，进而增大天线辐射口径效率，提升折叠态下的天线效率。
需要说明的是，在本文中，术语“包括”、“包含”或者其任何其他变体意在涵盖非排他性的包含，从而使得包括一系列要素的过程、方法、物品或者装置不仅包括那些要素，而且还包括没有明确列出的其他要素，或者是还包括为这种过程、方法、物品或者装置所固有的要素。在没有更多限制的情况下，由语句“包括一个……”限定的要素，并不排除在包括该要素的过程、方法、物品或者装置中还存在另外的相同要素。
上面结合附图对本申请的实施例进行了描述，但是本申请并不局限于上述的具体实施方式，上述的具体实施方式仅仅是示意性的，而不是限制性的，本领域的普通技术人员在本申请的启示下，在不脱离本申请宗旨和权利要求所保护的范围情况下，还可做出很多形式，均属于本申请的保护之内。

Claims (10)

  1. 一种可折叠电子设备，包括折叠屏和天线结构，所述天线结构包括：第一天线、第二天线、第一馈源、第二馈源和第一匹配电路；
    其中，所述第一天线设置在所述折叠屏的主屏幕的边框，所述第二天线设置在所述折叠屏的副屏幕的边框，所述第一天线与所述第二天线均与铰接件连接，所述铰接件设置在所述主屏幕与所述副屏幕之间；
    所述第一天线上靠近所述第二天线的第一位置接地；
    所述第一馈源与所述第一天线上远离所述第二天线的第二位置连接，所述第一匹配电路的一端与所述第二位置连接，另一端接地；
    所述第二馈源与所述第二天线连接，所述第二天线上靠近所述第一天线的第三位置接地；
    所述第一天线与所述第二天线工作在不同频段，所述第一匹配电路包括两个调谐支路，其中一个调谐支路用于调谐所述第一天线的谐振频段为第一频段，使得在所述折叠屏处于展开状态下时所述第一天线产生的寄生电流与所述第二天线产生的电流同向，另一个调谐支路用于调谐所述第一天线的谐振频段为第二频段，使得在所述折叠屏处于折叠状态下时所述第一天线产生的寄生电流与所述第二天线产生的电流同向，所述第一频段低于所述第二天线的工作频段，所述第二频段高于所述第二天线的工作频段。
  2. 根据权利要求1所述的可折叠电子设备，其中，所述天线结构还包括第三天线和第四天线；
    其中，所述第三天线设置在所述主屏幕的边框，且与所述第一天线之间具有间隙；所述第四天线设置在所述副屏幕的边框，且与所述第二天线之间具有间隙；
    所述第三天线上远离所述第一天线的第四位置接地；
    所述第四天线上远离所述第三天线的第五位置接地。
  3. 根据权利要求1或2所述的可折叠电子设备，其中，所述第一匹配电路包括并联的第一支路、第二支路和第三支路，所述第一支路包括串联的第一电容和第一电感，所述第二支路包括串联的第二电感和第一开关，所述第三支路包括串联的第二电容和第二开关；
    在所述折叠屏处于展开状态时，所述第一开关处于断开状态，所述第二开关处于闭合态，所述第一天线的谐振频段被调谐为第一频段，使得所述展开状态下所述第一天线产生的寄生电流与所述第二天线产生的电流同向；在所述折叠屏处于折叠状态时，所述第一开关处于闭合状态，所第二开关处于断开状态，所述第一天线的谐振频段被调谐为第二频段，使得所述折叠状态下所述第一天线产生的寄生电流与所述第二天线产生的电流同向。
  4. 根据权利要求1或2所述的可折叠电子设备，其中，所述天线结构还包括第二匹配电路；
    所述第二馈源与所述第二天线上远离所述第一天线的第六位置连接，所述第二匹配电路的一端与所述第六位置连接，另一端接地；
    所述第二匹配电路包括串联的第三电感和第三电容。
  5. 根据权利要求2所述的可折叠电子设备，其中，所述天线结构还包括第三馈源和第三匹配电路；
    所述第三馈源与所述第三天线上靠近所述第一天线的第七位置连接，所述第三匹配电路的一端与所述第七位置连接，另一端接地；
    所述第三匹配电路包括串联的第四电感和第四电容。
  6. 根据权利要求2所述的可折叠电子设备，其中，所述天线结构还包括第四匹配电路；
    所述第四匹配电路的一端与所述第四天线上靠近所述第二天线的第八位置连接，另一端接地；
    所述第四匹配电路包括并联的第四支路和第五支路，所述第四支路包括串联的第五电感和第五电容，所述第五支路包括第六电感。
  7. 根据权利要求2所述的可折叠电子设备，其中，天线长度L1、天线间隙长度L2与天线长度L3的长度和等于所述第一天线的第一工作频段的二分之一波长，所述第一工作频段包括WIFI2.4G频段；
    天线长度L5等于所述第二天线的工作频段的四分之一波长，所述第二天线的工作频段包括GPSL5频段；
    其中，L1为所述第三天线靠近所述第一天线的端点到所述第四位置的长度，L2为所述第一天线与所述第三天线之间的间隙长度，L3为所述第一天线远离所述第二天线的端点到所述第二位置的长度，L5为所述第二天线远离所述第一天线的端点到所述第三位置的长度。
  8. 根据权利要求1或2所述的可折叠电子设备，其中，天线长度L3与天线长度L4的长度和等于所述第一天线的第二工作频段的四分之一波长，所述第二工作频段包括中高频段MHB；
    天线长度L5等于所述第二天线的工作频段的四分之一波长，所述第二天线的工作频段包括GPSL5频段；
    其中，L3为所述第一天线远离所述第二天线的端点到所述第二位置的长度，L4为所述第二位置到所述第一位置的长度，L5为所述第二天线远离所述第一天线的端点到所述第三位置的长度。
  9. 根据权利要求1或2所述的可折叠电子设备，其中，天线长度L3等于所述第一天线的第三工作频段的四分之一波长，所述第三工作频段包括N78频段；
    天线长度L5等于所述第二天线的工作频段的四分之一波长，所述第二天线的工作频段包括GPSL5频段；
    其中，L3为所述第一天线远离所述第二天线的端点到所述第二位置的长度，L5为所述第二天线远离所述第一天线的端点到所述第三位置的长度。
  10. 根据权利要求7所述的可折叠电子设备，其中，L1等于所述第三天线的工作频段的四分之一波长，所述第三天线的工作频段包括GPSL1频段。
PCT/CN2024/083455 2023-03-31 2024-03-25 可折叠电子设备 Ceased WO2024199162A1 (zh)

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Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116826357B (zh) * 2023-03-31 2026-04-10 维沃移动通信有限公司 可折叠电子设备
CN119833930B (zh) * 2023-10-13 2025-10-17 Oppo广东移动通信有限公司 电子设备
CN120261975A (zh) * 2023-12-26 2025-07-04 荣耀终端股份有限公司 一种可折叠电子设备
CN119627428B (zh) * 2024-05-07 2026-04-24 华为技术有限公司 一种移动终端
CN118738861A (zh) * 2024-07-06 2024-10-01 深圳市锐尔觅移动通信有限公司 天线模组及电子设备
CN119009493B (zh) * 2024-09-13 2026-03-24 复旦大学 一种应用在可折叠电子设备中的天线

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113454843A (zh) * 2019-02-22 2021-09-28 华为技术有限公司 天线装置及电子设备
CN115360512A (zh) * 2022-08-24 2022-11-18 维沃移动通信有限公司 天线结构和电子设备
CN115377659A (zh) * 2021-05-17 2022-11-22 华为技术有限公司 天线及可折叠电子设备
CN218525725U (zh) * 2022-08-11 2023-02-24 北京小米移动软件有限公司 折叠屏设备的天线模组及折叠屏设备
US20230085568A1 (en) * 2021-09-16 2023-03-16 Samsung Electronics Co., Ltd. Electronic device including flexible display and method of controlling the same
CN116826357A (zh) * 2023-03-31 2023-09-29 维沃移动通信有限公司 可折叠电子设备

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112151960A (zh) * 2019-06-28 2020-12-29 华为技术有限公司 可折叠的移动终端和天线控制方法
CN213905595U (zh) * 2021-01-29 2021-08-06 维沃移动通信有限公司 电子设备
CN115425390B (zh) * 2022-09-05 2023-07-14 荣耀终端有限公司 一种终端天线及电子设备

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113454843A (zh) * 2019-02-22 2021-09-28 华为技术有限公司 天线装置及电子设备
CN115377659A (zh) * 2021-05-17 2022-11-22 华为技术有限公司 天线及可折叠电子设备
US20230085568A1 (en) * 2021-09-16 2023-03-16 Samsung Electronics Co., Ltd. Electronic device including flexible display and method of controlling the same
CN218525725U (zh) * 2022-08-11 2023-02-24 北京小米移动软件有限公司 折叠屏设备的天线模组及折叠屏设备
CN115360512A (zh) * 2022-08-24 2022-11-18 维沃移动通信有限公司 天线结构和电子设备
CN116826357A (zh) * 2023-03-31 2023-09-29 维沃移动通信有限公司 可折叠电子设备

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