Foldable electronic device

Abstract

The application discloses a foldable electronic device, and belongs to the technical field of communication. The antenna structure of the foldable electronic device comprises 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 foldable screen, the second antenna is arranged on the frame of the auxiliary screen of the foldable screen, the first antenna and the second antenna are connected with a hinge, and the hinge is arranged between the main screen and the auxiliary screen. The first feed source is connected with a second position of the first antenna away from the second antenna, one end of the first matching circuit is connected with the second position, and the other end is grounded. The second feed source is connected with the second antenna. One tuning branch in the first matching circuit is used for tuning the resonant frequency range of the first antenna, so that the currents generated by the first antenna and the second antenna are in the same direction in the unfolded state. The other tuning branch is used for tuning the resonant frequency range of the first antenna, so that the currents generated by the first antenna and the second antenna are in the same direction in the folded state.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of communication, and particularly relates to a foldable electronic device. BACKGROUND

[0002] In the existing antenna design scheme of the foldable-screen electronic device, the antenna is usually designed in the main body, and a switch is added in the auxiliary body for tuning. However, this cannot completely solve the problem of insufficient layout space in the main body, and there are many challenges in the layout of the antenna in the auxiliary body, such as the decrease of the antenna efficiency of the electronic device after folding, the decrease of the isolation degree between the antennas, and the like. At present, there is no good solution to this problem. SUMMARY

[0003] The purpose of the embodiments of the present application is to provide a foldable electronic device, which can solve the problem of poor antenna efficiency of the existing foldable-screen electronic device.

[0004] In a first aspect, the embodiments of the present application provide a foldable electronic device, comprising a foldable screen and an antenna structure, wherein the antenna structure comprises a first antenna, a second antenna, a first feed source, a second feed source and a first matching circuit.

[0005] The first antenna is arranged at the frame of the main screen of the foldable screen, the second antenna is arranged at the frame of the auxiliary screen of the foldable screen, and the first antenna and the second antenna are connected with a hinge, which is arranged between the main screen and the auxiliary screen.

[0006] The first position of the first antenna close to the second antenna is grounded.

[0007] The second position of the first antenna away from the second antenna is connected with the first feed source, one end of the first matching circuit is connected with the second position, and the other end is grounded.

[0008] The second feed source is connected with the second antenna, and the third position of the second antenna close to the first antenna is grounded.

[0009] The first antenna and the second antenna work at different frequency bands, the first matching circuit comprises two tuning branches, one of which is used to tune the resonance frequency band of the first antenna to be the first frequency band, so that the parasitic current generated by the first antenna and the current generated by the second antenna are in the same direction when the foldable screen is in the unfolded state, and the other tuning branch is used to tune the resonance frequency band of the first antenna to be the second frequency band, so that the parasitic current generated by the first antenna and the current generated by the second antenna are in the same direction when the foldable screen is in the folded state, the first frequency band is lower than the working frequency band of the second antenna, and the second frequency band is higher than the working frequency band of the second antenna.

[0010] In the embodiment of the present application, the foldable electronic device includes a foldable 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 foldable screen, the second antenna is arranged on the frame of the auxiliary screen of the foldable screen, the first antenna and the second antenna are connected with a hinge, and the hinge is arranged between the main screen and the auxiliary screen; a first position on the first antenna close to the second antenna is grounded; the first feed source is connected with a second position on the first antenna away from the second antenna, one end of the first matching circuit is connected with the second position, and the other end is grounded; the second feed source is connected with the second antenna, and a third position on the second antenna close to the first antenna is grounded; the first antenna and the second antenna work in different frequency bands, the first matching circuit includes two tuning branches, one of which is used to tune the resonance frequency band of the first antenna to be a first frequency band, so that the parasitic current generated by the first antenna and the current generated by the second antenna are in the same direction when the foldable screen is in an unfolded state, and the other tuning branch is used to tune the resonance frequency band of the first antenna to be a second frequency band, so that the parasitic current generated by the first antenna and the current generated by the second antenna are in the same direction when the foldable screen is in a folded state, the first frequency band is lower than the working frequency band of the second antenna, and the second frequency band is higher than the working frequency band of the second antenna. In this way, by arranging the first matching circuit including two tuning branches on the antenna of the main screen of the foldable electronic device, not only can the resonance frequency band of the first antenna be tuned by one tuning branch to make the first antenna and the second antenna generate the same current when the electronic device is unfolded, thereby improving the antenna efficiency in the unfolded state, but also the resonance frequency band of the first antenna can be tuned by the other tuning branch to change the phase of the parasitic resonance current generated by the first antenna in the working frequency band of the second antenna, so that it is in the same direction with the current generated by the second antenna, thereby increasing the antenna aperture efficiency and improving the antenna efficiency in the folded state. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 FIG. 1 is a schematic diagram of an antenna structure of a foldable electronic device provided by an embodiment of the present application;

[0012] Figure 2 FIG. 2 is a schematic diagram of an antenna structure of a foldable electronic device in an unfolded state provided by an embodiment of the present application;

[0013] Figure 3 FIG. 3 is a schematic diagram of an antenna structure of a foldable electronic device in a folded state provided by an embodiment of the present application;

[0014] Figure 4 FIG. 4 is a schematic diagram of a circuit structure of a first matching circuit M1 in the antenna structure provided by an embodiment of the present application;

[0015] Figures 5a to 5c is a schematic diagram of current distribution of each antenna in an unfolded state provided by an embodiment of the present application;

[0016] Figures 6a to 6c is a schematic diagram of circuit structure of each matching circuit in the antenna structure provided by an embodiment of the present application;

[0017] Figures 7a to 7c is a Smith chart of each antenna in an unfolded state provided by an embodiment of the present application;

[0018] Figure 7d is a schematic diagram of isolation of each antenna in an unfolded state provided by an embodiment of the present application;

[0019] Figures 8a to 8c is an efficiency diagram of each antenna in an unfolded state provided by an embodiment of the present application;

[0020] Figures 9a to 9c is a schematic diagram of current distribution of each antenna in a folded state provided by an embodiment of the present application;

[0021] Figures 10a to 10c is a Smith chart of each antenna in a folded state provided by an embodiment of the present application;

[0022] Figure 11 is a schematic diagram of isolation of each antenna in a folded state provided by an embodiment of the present application;

[0023] Figures 12a to 12c is an efficiency diagram of each antenna in a folded state provided by an embodiment of the present application;

[0024] Figures 13a to 13c is a simplified schematic diagram of GPS L5 antenna efficiency improvement principle provided by an embodiment of the present application;

[0025] Figure 14a and Figure 14b is a schematic diagram of current distribution of a dipole antenna in different states provided by an embodiment of the present application;

[0026] Figure 15 is a schematic diagram of frequency deviation of the main and auxiliary screen antennas in a folded state varying with frequency ratio provided by an embodiment of the present application;

[0027] Figures 16a to 16c is a schematic diagram of frequency deviation of each antenna in an unfolded state and a folded state provided by an embodiment of the present application;

[0028] Figure 17 is a Smith chart of the second antenna in an unfolded state provided by an embodiment of the present application;

[0029] Figure 18a and Figure 18bEfficiency diagrams of the second antenna in an unfolded state and a folded state are provided in the embodiments of the present application. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present application will be clearly described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all of them. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art belong to the scope of protection of the present application.

[0031] The terms "first", "second", and the like in the specification and claims of the present 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 interchanged under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second", etc. are usually a category and do not limit the number of objects, for example, the first object can be one or more. In addition, "and / or" in the specification and claims means at least one of the connected objects, and the character " / ", generally represents a "or" relationship between the front and rear associated objects.

[0032] The antenna structure provided by the embodiments of the present application will be described in detail below in combination with the drawings, specific embodiments and application scenarios.

[0033] Please refer to Figure 1 、 Figure 2 and Figure 3 , Figure 1 the antenna structure of the foldable electronic device provided by the embodiments of the present application is shown in the figure, Figure 2 and Figure 3 the structure schematic diagram of the antenna structure in the foldable electronic device provided by the embodiments of the present application is shown in the figure, the foldable electronic device 10 includes a folding screen 11 and an antenna structure, 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.

[0034] The first antenna A1 is arranged on the frame of the main screen 111 of the folding screen 11, the second antenna A2 is arranged on the frame of the auxiliary screen 112 of the folding screen, the first antenna A1 and the second antenna A2 are connected with a hinge 12, and the hinge 12 is arranged between the main screen 111 and the auxiliary screen 112.

[0035] The first position of the first antenna A1 close to the second antenna A2 is grounded.

[0036] The first feed source F1 is connected with a second position on the first antenna A1 away from the second antenna A2, one end of the first matching circuit M1 is connected with the second position, and the other end is grounded;

[0037] The second feed source F2 is connected with the second antenna A2, and a third position on the second antenna A2 close to the first antenna A1 is grounded;

[0038] The first antenna A1 and the second antenna A2 work in different frequency bands, and 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 be the first frequency band, so that the parasitic current generated by the first antenna A1 and the current generated by the second antenna A2 are in the same direction when the folding screen 11 is in the unfolded state, and the other tuning branch is used to tune the resonant frequency band of the first antenna A1 to be the second frequency band, so that the parasitic current generated by the first antenna A1 and the current generated by the second antenna A2 are in the same direction when the folding screen 11 is in the folded state, and the first frequency band is lower than the working frequency band of the second antenna A2, and the second frequency band is higher than the working frequency band of the second antenna A2.

[0039] The first antenna A1 and the second antenna A2 can be metal frame antennas as the radiation body of the antenna. Figure 2 and Figure 3 As shown in the figures, 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 auxiliary screen 112 of the foldable electronic device 10, and the first antenna A1 and the second antenna A2 are connected with the hinge 12, and the first antenna A1 and the second antenna A2 are both connected with a feed source and are both provided with a ground 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).

[0040] As shown in the figures, 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 auxiliary screen 112 of the foldable electronic device 10, and the first antenna A1 and the second antenna A2 are connected with the hinge 12, and the first antenna A1 and the second antenna A2 are both connected with a feed source and are both provided with a ground 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). Figure 1

[0041] ​The first antenna A1 is connected with a first feed source F1 at a second position away from the second antenna A2, the first feed source F1 is an antenna feed, used for transmitting the radio frequency power signal of the foldable electronic device 10 to the first antenna A1 body.

[0042] The second antenna A2 is connected with a second feed source F2, the second feed source F2 is an antenna feed, used for transmitting the radio frequency power signal of the foldable electronic device 10 to the second antenna A2 body.

[0043] The first antenna A1 is connected with a first feed source F1 at a second position away from the second antenna A2, the first feed source F1 is an antenna feed, used for transmitting the radio frequency power signal of the foldable electronic device 10 to the first antenna A1 body.

[0044] In this embodiment, the first antenna A1 and the second antenna A2 can be designed to work in different frequency bands, for example, the first antenna A1 can work in a slightly higher frequency band, such as N78 frequency band, WIFI 2.4G frequency band, middle high band (MHB) and the like, and the second antenna A2 can work in a lower frequency band, such as GPS L5 frequency band.

[0045] Specifically, when the foldable electronic device 10 is in the folded state, the current of the second antenna A2 in the folded state on the secondary screen 112 and the current of the first antenna A1 in the unfolded state on the primary screen 111 are opposite to each other, and the current of the second antenna A2 in the folded state on the secondary screen 112 and the current of the first antenna A1 in the unfolded state on the primary screen 111 are opposite to each other. Figure 5cThe current directions of the first antenna A1 and the second antenna A2 are consistent in the unfolded state. When the first antenna A1 is equivalent to an open circuit or a small capacitance under the ground in the working frequency band of the second antenna A2, such as the GPS L5 frequency band, the resonant frequency of the first antenna A1 on the main screen 111 will move to about 1.27 GHz, as shown in the Smith chart of the GPS L5 in the folded state. Figure 10c The resonant current of the first antenna A1 is turned by 180 degrees in the GPS L5 frequency band, and the current direction is as shown by the current 6 (I6), so that in the GPS L5 frequency band, the parasitic resonant current 6 (I6) of the first antenna A1 and the current 5 (I5) of the second antenna A2 in the GPS L5 are in the same direction, thereby increasing the antenna aperture efficiency, and the antenna efficiency of the second antenna A2 working in the GPS L5 frequency band after folding is increased by about 1.5 dB, as shown in the folded state efficiency of the GPS L5. Figure 9c Figure 12c

[0046] When the foldable electronic device 10 is in the unfolded state, a parasitic auxiliary resonance is added to the working frequency band of the second antenna A2, such as the GPS L5 frequency band, as shown in the Smith chart of the GPS L5 in the unfolded state. Figure 7c The resonance can be pulled to a frequency point lower than the GPS L5, about 1.12 GHz, as shown in the Smith chart of the GPS L5 in the unfolded state. Figure 8c The efficiency of the unfolded state in the GPS L5 frequency band can be increased by 1 dB to 1.5 dB.

[0047] Optionally, the antenna structure further comprises a third antenna A3 and a fourth antenna A4.

[0048] The third antenna A3 is arranged on the frame of the main screen 111 and has a gap with the first antenna A1, and the fourth antenna A4 is arranged on the frame of the secondary screen 112 and has a gap with the second antenna A2.

[0049] The fourth position of the third antenna A3 away from the first antenna A1 is grounded.

[0050] The fifth position of the fourth antenna A4 away from the third antenna A3 is grounded.

[0051] In an embodiment, a plurality of antennas can be arranged on the main screen 111 and the secondary screen 112 of the foldable electronic device 10 to obtain more antenna working modes. Specifically, a third antenna A3 can be arranged side by side with the first antenna A1 on the frame of the main screen 111, and a fourth antenna A4 can be arranged side by side with the second antenna A2 on the frame of the secondary screen 112, and the third antenna A3 and the fourth antenna A4 have gaps with the first antenna A1 and the second antenna A2, respectively, and the third antenna A3 and the fourth antenna A4 are both provided with antenna ground positions.​​

[0052] In this embodiment, the third antenna A3 can be designed to operate in a different frequency band from the first antenna A1 and the second antenna A2, such as the GPS L1 frequency band. The fourth antenna A4 is designed as a parasitic branch, which has no actual effect in the unfolded state and generates high-order harmonic and reverse parasitic current in the folded state, thereby reducing the influence on the efficiency of the first antenna A1 through the tuning matching circuit.

[0053] Optionally, the first matching circuit M1 includes first, second and third branches in parallel, the first branch includes a first capacitor C1 and a first inductor L1 in series, the second branch includes a second inductor L2 and a first switch S1 in series, and the third branch includes a second capacitor C2 and a second switch S2 in series.

[0054] When the folding screen 11 is in the unfolded state, the first switch S1 is in the open state and the second switch S2 is in the closed state, and 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 and the current generated by the second antenna A2 are in the same direction in the unfolded state; 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 and the current generated by the second antenna A2 are in the same direction in the folded state.

[0055] In an embodiment, the first matching circuit M1 can be as shown in Figure 4 i.e. including three parallel branches, which are a capacitor-inductor series branch, a switch-controlled inductor branch and a switch-controlled capacitor branch. 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. In this way, the on-off of the branch switch can be controlled according to the different states of the folding screen 11 of the foldable electronic device 10, so as to switch different tuning branches to ensure the working efficiency of the antenna.

[0056] Specifically, when the folding screen 11 is in the unfolded state, the first switch S1 of the second branch can be controlled to be in the open state and the second switch S2 of the third branch can be controlled to be in the connected state, so that it is equivalent to adding a parasitic auxiliary resonance to the working frequency band (such as the GPS L5 frequency band) of the second antenna A2 in this state, as shown in Figure 7cAs shown, the resonance can be pulled to a frequency of 1.12 GHz, which is lower than GPS L5. Figure 8c As shown, the efficiency of the second antenna A2 at the GPS L5 frequency band in the unfolded state can be improved by 1 dB to 1.5 dB.

[0057] When the folding screen 11 is in the folded state, the first switch S1 of the second branch can be controlled to be in the connected state, and 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 at the GPS L5 frequency band in the folded state. As shown, Figure 9c As shown, the current of the second antenna A2 at the GPS L5 frequency band in the folded state on the secondary screen 112 and Figure 5c As shown, the current directions in the unfolded state are consistent, but at this time, the first matching circuit M1 needs to be switched to the first switch in the connected state and the second switch in the disconnected state. The first antenna A1 is equivalent to an open circuit or a small capacitance at the working frequency band of the second antenna A2 such as the GPS L5 frequency band, and the resonant frequency of the first antenna A1 on the primary screen 111 will move to about 1.27 GHz, as shown in Figure 10c As shown, the Smith chart of the GPS L5 frequency band in the folded state. At this time, the phase of the resonant current of the first antenna A1 turns to 180° in the GPS L5 frequency band, and the current direction is as shown in Figure 9c As shown by the current 6 (I6), in the GPS L5 frequency band, the parasitic resonant current 6 (I6) of the first antenna A1 and the current 5 (I5) of the second antenna A2 at the GPS L5 are in the same direction, thereby increasing the antenna aperture efficiency, and the antenna efficiency of the second antenna A2 working at the GPS L5 frequency band in the folded state is improved by about 1.5 dB, as shown in Figure 12c As shown, the efficiency of the GPS L5 frequency band in the folded state.

[0058] In this way, in this embodiment, by switching the access branch of the matching circuit on the first antenna A1 according to the folding state of the electronic device, the antenna efficiency of the antenna structure in the unfolded state can be improved, the antenna isolation between antennas can be optimized, and the antenna efficiency of the antenna structure in the folded state can also be improved.

[0059] It should be noted that in an embodiment, in order to only ensure the antenna efficiency in the folded state, the first matching circuit M1 can only include the first branch and the second branch. In the unfolded state of the foldable electronic device 10, the parasitic current of the first antenna A1 and the current of the second antenna A2 at the GPS L5 are opposite, which reduces the efficiency of the second antenna A2 at the GPS L5 in the unfolded state. However, the second inductance in this embodiment is smaller than the inductance when the first matching circuit M1 further includes the third branch, and in the folded state of the foldable electronic device 10, the parasitic current resonant frequency point of the first antenna A1 moves to 1.33 GHz to 1.38 GHz, as shown in Figure 17The efficiency of the GPS L5 in the unfolded state is 0.5 dB lower than the original parasitic resonance-free efficiency, as shown in Figure 18a The GPS L5 efficiency in the folded state is equivalent to the case where the first matching circuit M1 further includes a third branch, as shown in Figure 18b That is, the improved GPS L5 efficiency in the folded state is also increased by 1 dB, and the cost of adding an antenna switch in the first matching circuit M1 can be saved.

[0060] Optionally, the lengths of the antenna length L1, the antenna gap length L2, and the antenna length L3 are equal to one-half of the wavelength of the first operating frequency band of the first antenna A1, and the first operating frequency band includes a WIFI 2.4G frequency band.

[0061] The antenna length L5 is equal to one-quarter of the wavelength of the operating frequency band of the second antenna A2, and the operating frequency band of the second antenna A2 includes a GPS L5 frequency band.

[0062] L1 is the length from the end point 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 end point of the first antenna A1 away from the second antenna A2 to the second position, and L5 is the length from the end point of the second antenna A2 away from the first antenna A1 to the third position.

[0063] In an embodiment, the first antenna A1 can be designed to operate in a WIFI 2.4G frequency band, and the second antenna A2 can be designed to operate in a GPS L5 frequency band. Therefore, the antenna lengths on the first antenna A1, the second antenna A2, and the third antenna A3, and the gap length between the first antenna A1 and the third antenna A3 can be reasonably designed. Of course, the first antenna A1 can also operate in other frequency bands.

[0064] Specifically, as shown in Figure 1 The antenna length L1 on the third antenna A3 is the length between the lower point and the end point close to the first antenna A1, L2 is the gap between the first antenna A1 and the third antenna A3, and the antenna length L3 on the first antenna A1 is the length between the end point close to the third antenna A3 and the feed point. In order to enable the first antenna A1 to operate in a WIFI 2.4G frequency band, the length of L1+L2+L3 can be designed to be equal to one-half of the wavelength of the resonant frequency band of the first antenna A1, i.e., the WIFI 2.4G frequency band.

[0065] The antenna length L5 on the second antenna A2 is the length between the end point of the second antenna A2 away from the first antenna A1 and the lower point. In order to enable the second antenna A2 to work in the GPS L5 frequency band, the length of L5 can be designed to be equal to the quarter wavelength of the resonant frequency band of the second antenna A2, i.e., the GPS L5 frequency band.

[0066] In this way, by reasonably designing the lengths of the antennas, it can be ensured that the main screen antenna can work in the WIFI 2.4G frequency band and the secondary screen antenna can work in the GPS L5 frequency band, so that the frequency ratio of the antenna frequency bands of the main screen and the secondary screen is about 1.9, so as to reduce the frequency deviation problem of the two corresponding antenna branches after folding.

[0067] Optionally, the length of the antenna length L3 and the length of the antenna length L4 are equal to the quarter wavelength of the second working frequency band of the first antenna A1, and the second working frequency band includes a middle-high frequency band MHB.

[0068] The antenna length L5 is equal to the quarter wavelength of the working frequency band of the second antenna A2, and the working frequency band of the second antenna A2 includes a GPS L5 frequency band.

[0069] Wherein, L3 is the length of the first antenna A1 away from the end point of the second antenna A2 to the second position, L4 is the length of the second position to the first position, and L5 is the length of the second antenna A2 away from the end point of the first antenna A1 to the third position.

[0070] In an embodiment, the first antenna A1 can also work in the MHB frequency band, and the second antenna A2 works in the GPS L5 frequency band, so that the lengths of the antennas on the first antenna A1 and the second antenna A2 can be reasonably designed.

[0071] Specifically, as shown in Figure 1 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, and the antenna length L4 on the first antenna A1 is the length between the feeding point and the lower point. In order to enable the first antenna A1 to work in the MHB frequency band, such as B1, B3 and B39 frequency bands, the length of L3+L4 can be designed to be equal to the quarter wavelength of the resonant frequency band of the first antenna A1, such as the highest frequency band in the B1, B3 and B39 frequency bands.

[0072] The antenna length L5 on the second antenna A2 is the length between the end point of the second antenna A2 away from the first antenna A1 and the lower point. In order to enable the second antenna A2 to work in the GPS L5 frequency band, the length of L5 can be designed to be equal to the quarter wavelength of the resonant frequency band of the second antenna A2, i.e., the GPS L5 frequency band.

[0073] In this way, by reasonably designing the lengths of the antennas, it can be ensured that the main screen antenna can also work in the MHB frequency band and the secondary screen antenna works in the GPS L5 frequency band, so that the frequency ratio of the antenna frequency bands of the main screen and the secondary screen is about 1.9, thereby reducing the frequency deviation problem of the two corresponding antenna branches after folding.

[0074] Optionally, the length L3 of the antenna is equal to a quarter wavelength of a third working frequency band of the first antenna A1, and the third working frequency band includes an N78 frequency band.

[0075] The length L5 of the antenna is equal to a quarter wavelength of a working frequency band of the second antenna A2, and the working frequency band of the second antenna A2 includes a GPS L5 frequency band.

[0076] L3 is the length of the first antenna A1 away from the second position, and L5 is the length of the second antenna A2 away from the third position.

[0077] In an embodiment, the first antenna A1 can also be designed to work in the N78 frequency band, and the second antenna A2 works in the GPS L5 frequency band, so that the lengths of the first antenna A1 and the second antenna A2 can be reasonably designed.

[0078] Specifically, as shown in Figure 1 The length L3 of the antenna on the first antenna A1 is the length between the end point close to the third antenna A3 and the feeding point. In order to enable the first antenna A1 to work in the N78 frequency band, the length L3 can be designed to be equal to a quarter wavelength of the resonant frequency band of the first antenna A1, i.e., the N78 frequency band.

[0079] The length L5 of the antenna on the second antenna A2 is the length between the end point away from the first antenna A1 and the lower point. In order to enable the second antenna A2 to work in the GPS L5 frequency band, the length 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.

[0080] In this way, by reasonably designing the lengths of the antennas, it can be ensured that the main screen antenna can also work in the N78 frequency band and the secondary screen antenna works in the GPS L5 frequency band, so that the frequency ratio of the antenna frequency bands of the main screen and the secondary screen is about 1.9, thereby reducing the frequency deviation problem of the two corresponding antenna branches after folding.

[0081] That is, in an embodiment, by reasonably designing the lengths L1, L2, L3 and L4 of the antennas, the first antenna A1 can work in one or more frequency bands among the N78, WIFI 2.4G and MHB frequency bands.

[0082] Optionally, the length L1 of the third antenna A3 is equal to a quarter of the wavelength of the working frequency band of the third antenna A3, and the working frequency band of the third antenna A3 includes the GPS L1 frequency band.

[0083] L1 is the length from the end point of the third antenna A3 close to the first antenna A1 to the fourth position.

[0084] In an implementation, the third antenna A3 can be designed to work in the GPS L1 frequency band, and thus the length of the third antenna A3 can be reasonably designed.

[0085] Specifically, as shown in Figure 1 , the length L1 of the third antenna A3 is the length from the end point of the third antenna A3 close to the first antenna A1 to the fourth position. To enable the third antenna A3 to work in the GPS L1 frequency band, the length L1 can be designed to be equal to a quarter of the wavelength of the resonant frequency band of the third antenna A3, i.e., the GPS L1 frequency band.

[0086] In this way, by reasonably designing the lengths of the antennas, it can be ensured that the antenna structure can work in the GPS L1 frequency band to meet the use requirements of the electronic device in the GPS L1 frequency band.

[0087] It should be noted that by reasonably planning and arranging the working frequency bands of the first antenna A1, the second antenna A2, and the third antenna A3, the first antenna A1 close to the hinge side of the main screen can be designed to have a relatively high frequency band, such as the MHB frequency band and the N78 frequency band, or the WIFI 2.4G / 5G frequency band, and the second antenna A2 close to the hinge side of the auxiliary screen can be designed to have a relatively low frequency band, such as the GPS L5 frequency band or the low-frequency LB frequency band, so that the frequency ratio of the two is 1.9, as shown in Figure 15 , to reduce the frequency deviation problem of the two corresponding antenna branches after folding. Because the above frequency band arrangement scheme is adopted on the folding screen, not only the MHB frequency band of the first antenna A1 is only deviated by 30MHz-40MHz, as shown in Figure 16a , but also the original frequency deviation of the GPS L5 frequency band of the second antenna A2 between the unfolded state and the folded state is controlled to be within 25MHz, as shown in Figure 16b . The reasonable frequency band arrangement scheme, together with the matching and scheme design of the dipole IFA antenna, can further reduce the frequency deviation of the matched GPS L5 frequency band after the unfolded state and the folded state to within 5M, as shown in Figure 16c .

[0088] That is, by reasonably designing the lengths of the antennas L1, L2, L3, L4 and L5, the first antenna A1 can work in the N78, WIFI 2.4G and MHB frequency bands, the second antenna A2 can work in the GPS L5 frequency band, and the third antenna A3 can work in the GPS L1 frequency band, so as to not only enrich the working frequency bands of the antenna structure, but also greatly reduce the frequency deviation problem of the two corresponding antenna branches after the electronic device is folded.

[0089] Optionally, the antenna structure further comprises a second matching circuit M2.

[0090] The second feed source F2 is connected to a sixth position on the second antenna A2 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.

[0091] The second matching circuit M2 comprises a third inductor and a third capacitor in series.

[0092] In an embodiment, a feed point and an LC matching circuit can be provided on the second antenna A2 for reducing the influence of the second antenna A2 on the first antenna A1. Specifically, as shown in Figure 1 The sixth position on the second antenna A2 away from the first antenna A1 is connected to a second feed source F2 and a second matching circuit M2, as shown in Figure 6a The second matching circuit M2 is an LC series circuit comprising a third inductor L3 and a third capacitor C3 in series.

[0093] The foldable electronic device 10 in the folded state, Figure 9a As shown in the second antenna A2 branch of the first antenna A1 in the N78 frequency band, a high-order harmonic, i.e. a parasitic branch current 9 (I9) is induced, and the current 10 (I10) generated by the first antenna A1 in the N78 frequency band in the folded state is opposite, so a complex LC matching of the second matching circuit M2 can be used to tune the harmonic of the parasitic current out of the band. Through the LC matching in the second matching circuit M2, it is equivalent to a capacitor in the GPS L5 frequency band, and a large capacitor or 0 ohm in the N78 frequency band. In addition to the impedance matching effect on GPS L5, it can be used to move the resonance frequency of the reverse left half parasitic branch current 9 (I9) to a frequency lower than 3.3 GHz in the folded state, so as to reduce the influence of the parasitic current on the first antenna A1 in the N78 frequency band. As shown in the Smith chart of the first antenna A1 in the above debugging mode, Figure 10a As shown in the folded state efficiency, Figure 12a As shown in the folded state efficiency,

[0094] In this way, by arranging the second matching circuit M2 on the second antenna A2, the influence of the second antenna A2 on the first antenna A1 can be greatly reduced in the folded state, so as to improve the efficiency of the first antenna A1.

[0095] Optionally, the antenna structure further comprises a third feed F3 and a third matching circuit M3.

[0096] The third feed F3 is connected to a seventh position on the third antenna A3 close to the first antenna A1, and one end of the third matching circuit M3 is connected to the seventh position and the other end is grounded.

[0097] The third matching circuit M3 comprises a fourth inductor and a fourth capacitor connected in series.

[0098] In an embodiment, a feed point and an LC matching circuit can be arranged on the third antenna A3 to solve the isolation problem between the third antenna A3 and the first antenna A1 in the high frequency band HB. Specifically, as shown in Figure 1 The third feed F3 is connected to a seventh position on the third antenna A3 close to the first antenna A1, and one end of the third matching circuit M3 is connected to the seventh position and the other end is grounded. Figure 6b The third matching circuit M3 is an LC series circuit comprising a fourth inductor L4 and a fourth capacitor C4 connected in series.

[0099] As shown in Figure 1 The third antenna A3 and the first antenna A1 are discontinuous seam antennas, and the isolation between them is generally poor because there is no ground in the middle. Figure 6b The third matching circuit M3 is a series resonance ground circuit comprising an inductor L and a capacitor C, which is equivalent to a 0-ohm ground in the HB frequency band of the first antenna A1 and a capacitive ground in the GPS L1 frequency band, thereby solving the isolation problem between the third antenna A3 and the first antenna A1 in the HB frequency band, as shown in Figure 7d The worst isolation after optimization is -18 dB, which can meet the requirements of radio frequency isolation, and the efficiency peak position of the first antenna A1 in the HB frequency band can also be controlled by adjusting the resonance position of the third matching circuit M3. The current of the first antenna A1 in the HB frequency band is actually Figure 5a The half-wave mode of the same direction of the discontinuous seam.

[0100] In this way, by arranging the third matching circuit M3 on the third antenna A3, the isolation problem between the third antenna A3 and the first antenna A1 in the HB frequency band can be solved, and the efficiency of the first antenna A1 can also be improved by adjusting the resonance position of the third matching circuit M3.

[0101] Optionally, the antenna structure further comprises a fourth matching circuit M4.

[0102] One end of the fourth matching circuit M4 is connected to the eighth position on the fourth antenna A4 close to the second antenna A2, and the other end is grounded;

[0103] The fourth matching circuit M4 includes a fourth branch and a fifth branch in parallel, the fourth branch includes a fifth inductor and a fifth capacitor in series, and the fifth branch includes a sixth inductor.

[0104] In an embodiment, an LC matching circuit can be arranged on the fourth antenna A4 to reduce the influence of the fourth antenna A4 on the efficiency of the first antenna A1. Specifically, as shown in Figure 1 , the fourth matching circuit M4 is connected to the eighth position on the fourth antenna A4 close to the second antenna A2, and as shown in Figure 6c , the fourth matching circuit M4 is an LC series-parallel circuit, specifically, a fifth inductor L5 and a fifth capacitor C5 are connected in series, and then connected in parallel with a sixth inductor L6.

[0105] When the foldable electronic device 10 is in the folded state, as shown in Figure 9a , the current mode of the first antenna A1 in the folded state and Figure 5a , the current mode of the unfolded state are consistent, but the distance between the secondary screen 112 and the main screen 111 is very close after the foldable electronic device 10 is folded. Due to the principle of induced current, the passive branch will be excited to a strong induced resonant current itself (similar to the current excited by the feeding branch to the passive parasitic branch in the conventional electronic device design) if it is closer to the active branch. At this time, the fourth antenna A4 branch generates a high-order harmonic that exceeds its own resonance near the HB frequency band of the first antenna A1, that is, a reverse parasitic branch current 8 (I8). The parasitic current 8 on the right half is opposite to the current 2 (I2) of 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, it will cause the efficiency of the first antenna A1 to decrease, so the fourth matching circuit M4 needs to be matched to be equivalent to 0 ohm or a large capacitance when 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, reducing its influence on the efficiency of the first antenna A1.

[0106] In addition, as shown in Figure 9b , the current of the GPS L1 of the third antenna A3 of the main screen 111 in the folded state and Figure 5b , the current direction in the unfolded state are consistent, and the parasitic current mode of the secondary screen 112 is matched to be equivalent to a small capacitance in GPS L1 through the fourth matching circuit M4, so as to pull its parasitic resonant frequency to about 1.75 GHz, as shown in Figure 10bSmith chart of the folded GPSL1. The parasitic resonance current at 1.75GHz and the current 3 (I3) of the third antenna A3 at GPSL1 are opposite, but in the frequency band of 1.55GHz-1.65GHz, the phase of the parasitic resonance current of the second antenna A2 just turns to 180°, as shown by the current 7 (I7), at this time, the parasitic resonance current 7 (I7) of the second antenna A2 and the current 3 (I3) of the third antenna A3 at GPSL1 are in the same direction, which can further increase the antenna aperture efficiency, and the efficiency of the folded GPSL1 antenna can be increased by about 1dB, as shown in Figure 9b . Figure 12b . Figure 11 . .

[0107] In this way, by arranging the fourth matching circuit M4 on the fourth antenna A4, not only can the influence of the fourth antenna A4 on the first antenna A1 be greatly reduced in the folded state, so as to improve the efficiency of the first antenna A1, but also the efficiency of the third antenna A3 at GPSL1 can be improved.

[0108] In the embodiments of the present application, through the matching circuits on the antennas, not only the isolation problem between the first antenna A1 and the third antenna A3 is solved, but also the mutual coupling influence problem between the first antenna A1, the second antenna A2 and the third antenna A3 in the unfolded and folded states of the main and auxiliary screens is ingeniously solved, so as to ensure the efficiencies of the three antennas in the folded and unfolded states, and make each antenna be in the best performance state.

[0109] Next, taking 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, the embodiments of the present application are further described in combination with the drawings in the embodiments of the present application:

[0110] As shown in Figure 1 , 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 working frequency band of each antenna.

[0111] In the unfolded state of the foldable electronic device 10, the first antenna A1 is in the IFA mode of the curve 1 in Figure 5a , and the current 1 (I1) is generated in this mode, as shown by Figure 1The length of L3+L4, as shown, is determined by the combined length of both L3 and L4. The length of L3+L4 is generally one-quarter of the wavelength of its resonant frequency band; in the B40, B41, and WIFI 2.4G frequency bands, it is located in... Figure 5a The same-direction half-wave mode shown in curve 2 is composed of... Figure 1 The length of L3+L2+L1, as shown, is determined by the common length of L3+L2+L1, which is generally half the wavelength of its resonant frequency band; in the N78 frequency band, it is Figure 5a The monopole mode shown in curve 3 is also derived from... Figure 1 The length of L3, as shown, is determined by the frequency band; typically, it is a quarter wavelength of the resonant frequency band. The Smith chart of the first antenna A1 in its deployed state is shown below. Figure 7a As shown, its efficiency is as follows Figure 8a As shown.

[0112] The second antenna A2 operates in the GPS L5 band, and is Figure 5c The IFA mode shown is composed of Figure 1 The length of L5, as shown, is typically one-quarter of the wavelength of its resonant frequency band. The Smith chart of the second antenna A2 in its expanded state is shown below. Figure 7c As shown, its efficiency is as follows Figure 8c As shown.

[0113] The third antenna A3 operates in the GPS L1 band, and is Figure 5b The IFA mode shown is composed of Figure 1 The length of L1, as shown, is typically one-quarter of the wavelength of its resonant frequency band. The Smith chart of the third antenna A3 in its expanded state is shown below. Figure 7b As shown, its efficiency is as follows Figure 8b As shown.

[0114] Most current foldable screen antenna solutions improve efficiency after the electronic device screen is folded by tuning the LC matching of the secondary screen to convert parasitic stubs on the LC matching into unidirectional currents, similar to the secondary parasitic stubs of GPSL1 in this application embodiment. However, this solution has virtually no improvement effect once the screen is unfolded. However, this application embodiment, referencing the basic principle of foldable dipoles, adopts a new design for GPSL5, namely a dipole IFA antenna. This not only improves the efficiency of GPSL5 in the folded state but also further improves the efficiency of GPSL5 in the unfolded state after the foldable electronic device 10 is unfolded. The dipole IFA antenna is essentially two IFA antennas placed side-by-side on both sides of the hinge. After the foldable electronic device 10 is unfolded, the first matching circuit M1 of the first antenna A1 switches the first branch and the third branch; this state can be called switch state 1. This shifts the parasitic resonant frequency of the first antenna A1 to 1.12GHz, forming a frequency within the GPSL5 band.Figure 13a The dipole IFA current is shown as Figure 5c As shown, the second antenna A2 generates current 5 (I5), and the first antenna Al generates current 4 (I4), the principle and Figure 14a As shown, the other side of the unfolded conventional dipole is the branch current, which forms the same current to improve the efficiency. After folding the foldable electronic device 10, if the first matching circuit Ml of the first antenna Al still adopts the switch state 1, the current of the dipole IFA after folding is Figure 13b As shown, and Figure 14b The current of the conventional dipole after folding is the same as that of the conventional dipole, and at this time the current is opposite, which only reduces the efficiency of the GPSL5 antenna of the secondary screen. In the embodiment of the application, another way is adopted, that is, the switch of the first matching circuit Ml of the first antenna Al is switched on the first branch and the second branch, and this state can be called switch state 2. The parasitic resonance frequency point of the first antenna Al itself is moved to 1.27 GHz, so that the frequency difference Af between f0 (1.27 GHz) and fl (the resonance frequency point 1.176 GHz of GPSL5) can make the current phase Af of the GPSL5 band reverse 180°, forming the same current distribution of the dipole IFA antenna in the folded state as Figure 13c As shown. The advantage of this design is to ensure that the GPSL5 can still achieve the performance of designing the GPSL5 to the main screen antenna in the extreme environment of the two screen angles. The relationship between Af and Af is shown in the following formula:

[0115] Δφ = Δβ x L

[0116]

[0117] In addition, the frequency band of the first antenna Al, the third antenna A3 and the second antenna A2 is reasonably planned and arranged in the embodiment of the application. The first antenna Al on the main screen near the hinge side is designed as a frequency band with a relatively high frequency, such as the MHB and N78 frequency bands, or the WIFI 2.4G / 5G frequency band, etc. The parasitic antenna of the secondary screen near the hinge side, that is, the second antenna A2, is designed as a frequency band with a relatively low frequency, such as the GPSL5 frequency band, and the frequency ratio of the two is 1.9, as shown in Figure 15 As shown, to reduce the frequency deviation problem of the two corresponding antenna branches after folding. Because the frequency band scheme layout is adopted in the folding screen according to the application, not only the MHB frequency band of the first antenna Al is only deviated by 30MHz-40MHz, as shown in Figure 16a As shown, but also the original frequency deviation between the GPSL5 of the second antenna A2 in the unfolded state and the folded state is controlled within 25MHz, as shown in Figure 16b As shown. The reasonable frequency band scheme layout and the application of the matching and scheme design of the dipole IFA can further reduce the frequency deviation of the matched GPSL5 in the unfolded state and the folded state to within 5M, such asFigure 16c as shown.

[0118] In the embodiment of the present application, the foldable electronic device includes a foldable 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 foldable screen, the second antenna is arranged on the frame of the auxiliary screen of the foldable screen, the first antenna and the second antenna are connected with a hinge, the hinge is arranged between the main screen and the auxiliary screen; a first position on the first antenna close to the second antenna is grounded; the first feed source is connected with a second position on the first antenna away from the second antenna, one end of the first matching circuit is connected with the second position, and the other end is grounded; the second feed source is connected with the second antenna, and a third position on the second antenna close to the first antenna is grounded; the first antenna and the second antenna work 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 be the first frequency band, so that the parasitic current generated by the first antenna and the current generated by the second antenna are in the same direction when the foldable screen is in the unfolded state, and the other tuning branch is used to tune the resonant frequency band of the first antenna to be the second frequency band, so that the parasitic current generated by the first antenna and the current generated by the second antenna are in the same direction when the foldable screen is in the folded state, the first frequency band is lower than the working frequency band of the second antenna, and the second frequency band is higher than the working frequency band of the second antenna. In this way, by arranging the first matching circuit including two tuning branches on the antenna of the main screen of the foldable electronic device, not only can the resonant frequency band of the first antenna be tuned by one tuning branch to make the first antenna and the second antenna generate the same current when the electronic device is unfolded, thereby improving the antenna efficiency in the unfolded state, but also the resonant frequency band of the first antenna can be tuned by the other 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 with the current generated by the second antenna, thereby increasing the antenna aperture efficiency and improving the antenna efficiency in the folded state.

[0119] It should be noted that in this document, the terms "comprising", "containing", or any other variant thereof are intended to cover non-exclusive inclusions, so that a process, method, article or device that includes a series of elements not only includes those elements, but also includes other elements not explicitly listed, or includes elements inherent to such a process, method, article or device. Without more limitations, the element defined by the statement "comprising a" does not exclude the presence of other identical elements in the process, method, article or device that includes the element.

[0120] The embodiments of the present application are described above with reference to the accompanying drawings, but the present application is not limited to the specific embodiments described above, and the specific embodiments described above are merely illustrative, but not restrictive, and a person of ordinary skill in the art can make many forms under the inspiration of the present application without departing from the purpose of the present application and the scope protected by the claims.

Claims

1. A foldable electronic device, characterized by, The antenna structure comprises a folding screen and an antenna structure, and the antenna structure comprises 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 auxiliary screen of the folding screen, and the first antenna and the second antenna are connected with a hinge, which is arranged between the main screen and the auxiliary screen; The first position of the first antenna close to the second antenna is grounded; The first feed source is connected with the second position of the first antenna away from the second antenna, one end of the first matching circuit is connected with the second position, and the other end is grounded; The second feed source is connected with the second antenna, and the third position of the second antenna close to the first antenna is grounded; The first antenna and the second antenna work in different frequency bands, the first matching circuit comprises two tuning branches, one of which is used for tuning the resonance frequency band of the first antenna to be a first frequency band, so that the parasitic current generated by the first antenna and the current generated by the second antenna are in the same direction when the folding screen is in an unfolded state, and the other tuning branch is used for tuning the resonance frequency band of the first antenna to be a second frequency band, so that the parasitic current generated by the first antenna and the current generated by the second antenna are in the same direction when the folding screen is in a folded state, the first frequency band is lower than the working frequency band of the second antenna, and the second frequency band is higher than the working frequency band of the second antenna.

2. The foldable electronic device of claim 1, wherein, The antenna structure further comprises a third antenna and a fourth antenna; The third antenna is arranged on the frame of the main screen and has a gap with the first antenna, and the fourth antenna is arranged on the frame of the auxiliary screen and has a gap with the second antenna; The fourth position of the third antenna away from the first antenna is grounded; The fifth position of the fourth antenna away from the third antenna is grounded.

3. The foldable electronic device of claim 1 or 2, wherein, The first matching circuit comprises a first branch, a second branch and a third branch in parallel, the first branch comprises a first capacitor and a first inductor in series, the second branch comprises a second inductor and a first switch in series, and the third branch comprises a second capacitor and a second switch in series; When the folding screen is in an unfolded state, the first switch is in an open state, the second switch is in a closed state, the resonance frequency band of the first antenna is tuned to a first frequency band, so that the parasitic current generated by the first antenna and the current generated by the second antenna are in the same direction in the unfolded state; when the folding screen is in a folded state, the first switch is in a closed state, the second switch is in an open state, the resonance frequency band of the first antenna is tuned to a second frequency band, so that the parasitic current generated by the first antenna and the current generated by the second antenna are in the same direction in the folded state.

4. The foldable electronic device of claim 1 or 2, wherein, The antenna structure further comprises a second matching circuit; The second feed source is connected with the sixth position of the second antenna away from the first antenna, one end of the second matching circuit is connected with the sixth position, and the other end is grounded; The second matching circuit comprises a third inductor and a third capacitor in series.

5. The foldable electronic device of claim 2, wherein, The antenna structure further comprises a third feed and a third matching circuit; The third feed is connected to a seventh position on the third antenna close to the first antenna, one end of the third matching circuit is connected to the seventh position, and the other end is grounded; The third matching circuit comprises a fourth inductor and a fourth capacitor connected in series.

6. The foldable electronic device of claim 2, wherein, The antenna structure further comprises a fourth matching circuit; One end of the fourth matching circuit is connected to an eighth position on the fourth antenna close to the second antenna, and the other end is grounded; The fourth matching circuit comprises a fourth branch and a fifth branch connected in parallel, the fourth branch comprises a fifth inductor and a fifth capacitor connected in series, and the fifth branch comprises a sixth inductor.

7. The foldable electronic device of claim 2, wherein, The length of the antenna length L1, the antenna gap length L2, and the antenna length L3 is equal to one half of the wavelength of the first operating frequency band of the first antenna, and the first operating frequency band comprises a WIFI 2.4G frequency band; The antenna length L5 is equal to one quarter of the wavelength of the operating frequency band of the second antenna, and the operating frequency band of the second antenna comprises a GPS L5 frequency band; L1 is the length from the end point of the third antenna close to the first antenna to the fourth position, L2 is the gap length between the first antenna and the third antenna, L3 is the length from the end point of the first antenna away from the second antenna to the second position, and L5 is the length from the end point of the second antenna away from the first antenna to the third position.

8. The foldable electronic device of claim 1 or 2, wherein, The length of the antenna length L3 and the antenna length L4 is equal to one quarter of the wavelength of the second operating frequency band of the first antenna, and the second operating frequency band comprises a medium-high frequency band MHB; The antenna length L5 is equal to one quarter of the wavelength of the operating frequency band of the second antenna, and the operating frequency band of the second antenna comprises a GPS L5 frequency band; L3 is the length from the end point of the first antenna away from the second antenna to the second position, L4 is the length from the second position to the first position, and L5 is the length from the end point of the second antenna away from the first antenna to the third position.

9. The foldable electronic device of claim 1 or 2, wherein, The antenna length L3 is equal to one quarter of the wavelength of the third operating frequency band of the first antenna, and the third operating frequency band comprises an N78 frequency band; The antenna length L5 is equal to one quarter of the wavelength of the operating frequency band of the second antenna, and the operating frequency band of the second antenna comprises a GPS L5 frequency band; L3 is the length from the end point of the first antenna away from the second antenna to the second position, and L5 is the length from the end point of the second antenna away from the first antenna to the third position.

10. The foldable electronic device of claim 7, wherein, L1 is equal to one quarter of the wavelength of the operating frequency band of the third antenna, and the operating frequency band of the third antenna comprises a GPS L1 frequency band.

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