Mobile terminal

Abstract

The invention provides a mobile terminal. The mobile terminal comprises three shells and an antenna system, wherein the three shells are rotationally connected in sequence. The antenna system comprises a satellite antenna, the satellite antenna comprises a satellite radio frequency link, a first radiator, a second radiator, a third radiator, a first tuning circuit and a second tuning circuit, and the satellite radio frequency link is coupled with the third radiator. The first radiator, the second radiator and the third radiator are respectively arranged in different shells, and the three radiators are located at one end of the mobile terminal. The first radiator is coupled with the first tuning circuit, and the second radiator is coupled with the second tuning circuit. By adopting the scheme, when the satellite antenna is in a working state, the first radiating body and the first tuning circuit as well as the second radiating body and the second tuning circuit as well as the third radiating body can be utilized to jointly generate the target directional diagram of the satellite antenna, so that the optimization of the directional diagram of the satellite antenna and / or the gain of the satellite antenna is facilitated; therefore, the communication performance of the satellite antenna can be improved.

Description

[0001] The present application claims priority to the Chinese patent application No. 202410555767.4, filed on May 7, 2024, and entitled “A Foldable Terminal Device”, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0002] The present application relates to the field of communication technology, and in particular to a mobile terminal. BACKGROUND

[0003] With the development of human society, mobile terminals such as mobile phones have become an indispensable tool in people's lives. People's dependence on mobile terminals has affected all aspects of life. With the rise of technology for mobile terminals to achieve communication using communication satellites, people's actual use demand for mobile terminal communication satellite communication is becoming stronger and stronger.

[0004] In order to be able to use communication satellites to achieve communication, it is first necessary to establish a communication connection between the satellite antenna of the mobile terminal and the communication satellite, and the directional diagram of the satellite antenna is one of the factors affecting the communication connection speed and connection stability. For mobile terminals of different forms, such as straight board terminal products and foldable terminal products, and for foldable terminal products in different folding states, they usually have different floor sizes, and different floor sizes have different effects on the directional diagram. Therefore, by analyzing the directional diagram of the satellite antenna of the mobile terminal in different floor size forms, the design of the satellite antenna can be realized to achieve the purpose of improving the satellite communication performance of the mobile terminal. SUMMARY

[0005] The present application provides a mobile terminal for improving the satellite communication performance of the mobile terminal.

[0006] The mobile terminal provided in the application comprises a first shell, a second shell, a third shell, a first rotating shaft mechanism, a second rotating shaft mechanism and an antenna system. The first shell and the second shell are rotationally connected through the first rotating shaft mechanism, and the second shell and the third shell are rotationally connected through the second rotating shaft mechanism. The antenna system comprises a satellite antenna, and the satellite antenna comprises a satellite radio frequency link, a first radiator, a second radiator, a third radiator, a first tuning circuit and a second tuning circuit. The first radiator is coupled to the first tuning circuit, the second radiator is coupled to the second tuning circuit, and the third radiator is coupled to the satellite radio frequency link. In addition, the first radiator, the second radiator and the third radiator are arranged in different shells respectively. And along the axial direction of the mobile terminal, the first radiator, the second radiator and the third radiator are located at one end of the mobile terminal. Based on this, in the antenna system of the mobile terminal provided in the application, when the satellite antenna is in the working state, the first radiator and the first tuning circuit, the second radiator and the second tuning circuit, and the third radiator are used to jointly generate the target directional diagram of the satellite antenna. In this way, a resonance structure is formed by the first tuning circuit and the first radiator, and another resonance structure is formed by the second tuning circuit and the second radiator, so as to affect the resonance mode of the resonance generated by the third radiator by using the two resonance structures, so as to achieve the purpose of adjusting the target directional diagram of the satellite antenna and / or improving the gain of the satellite antenna, thereby improving the communication performance of the satellite antenna.

[0007] By adopting the design scheme of the antenna system provided in the application, the first radiator can be connected to the corresponding branch of the first tuning circuit, and the second radiator can be connected to the corresponding branch of the second tuning circuit according to the folding state of the mobile terminal, so that the resonance structure formed by the first tuning circuit and the first radiator and the resonance structure formed by the second tuning circuit and the second radiator can affect the resonance mode of the resonance generated by the third radiator.

[0008] Specifically, when the mobile terminal is in the unfolded state and the third radiator is arranged in the second housing, if the satellite antenna is in the working state, the first radiator is coupled to the ground plate through one branch of the first tuning circuit and is used to generate a first resonance. The second radiator is coupled to the ground plate through one branch of the second tuning circuit to form a first resonance structure, and the first resonance structure corresponds to a first frequency. In addition, the third radiator is used to generate a third resonance. The first frequency and the resonance point frequency of the third resonance satisfy: f13≤10%*f3, so that the current of the third radiator is suppressed through the coupling between the first radiator and the third radiator. In addition, the second frequency and the resonance point frequency of the third resonance satisfy: f23>10%*f3, so that the ground current and the current between the second radiator and the third radiator generate an orthogonal polarization radiation field through the coupling between the second radiator and the third radiator, thereby improving the circular polarization gain of the satellite antenna.

[0009] In actual application, when the mobile terminal is in the unfolded state and the third radiator is arranged in the second housing, if the satellite antenna is in the working state, the first radiator is coupled to the ground plate through one branch of the first tuning circuit to form a first resonance structure, and the first resonance structure corresponds to a first frequency. The second radiator is coupled to the ground plate through one branch of the second tuning circuit to form a second resonance structure, and the second resonance structure corresponds to a second frequency. The third radiator is used to generate a third resonance. The first frequency f1 and the resonance point frequency f3 of the third resonance satisfy: f13≤10%*f3, so that the current of the third radiator is suppressed through the coupling between the first radiator and the third radiator. In addition, the second frequency f2 and the resonance point frequency f3 of the third resonance satisfy: f23>10%*f3, so that the ground current and the current between the second radiator and the third radiator generate an orthogonal polarization radiation field through the coupling between the second radiator and the third radiator, thereby improving the circular polarization gain of the satellite antenna.

[0010] In one possible implementation, the frequency difference f13 between the first frequency f1 and the resonance point frequency f3 of the third resonance satisfies: 0≤f13≤100MHz. In addition, the frequency difference f23 between the second frequency f2 and the resonance point frequency f3 of the third resonance satisfies: f23>100MHz.

[0011] In another possible implementation of the present application, when the mobile terminal is in the unfolded state and the third radiator is arranged in the second housing, if the satellite antenna is in the working state, the first radiator is coupled to the ground plate through one branch of the first tuning circuit and is used to generate a first resonance. The second radiator is coupled to the ground plate through one branch of the second tuning circuit to form a first resonance structure, and the first resonance structure corresponds to a first frequency. In addition, the third radiator is used to generate a third resonance. The resonant point frequency of the third resonance is within a first communication frequency band of the satellite antenna, the first frequency is higher than the first communication frequency band, and the second frequency is higher than the first communication frequency band. In this way, the orthogonal polarization radiation field generated by the ground plate and the frame radiator is used to enhance the circular polarization gain of the satellite antenna, thereby improving the communication performance of the satellite antenna.

[0012] In actual application, when the mobile terminal is in the unfolded state and the third radiator is arranged in the second housing, if the satellite antenna is in the working state, the first radiator is coupled to the ground plate through one branch of the first tuning circuit to form a first resonance structure, and the first resonance structure corresponds to a first frequency. The second radiator is coupled to the ground plate through one branch of the second tuning circuit to form a second resonance structure, and the second resonance structure corresponds to a second frequency. The third radiator is used to generate a third resonance. The frequency difference f13 between the first frequency f1 and the resonant point frequency f3 of the third resonance satisfies: f13>10%*f3, so as to make the ground current and the current between the first radiator and the third radiator generate an orthogonal polarization radiation field through the coupling between the first radiator and the third radiator, thereby enhancing the circular polarization gain of the satellite antenna. In addition, the frequency difference f23 between the second frequency f2 and the resonant point frequency f3 of the third resonance satisfies: f23>10%*f3, so as to make the ground current and the current between the first radiator and the third radiator generate an orthogonal polarization radiation field through the coupling between the second radiator and the third radiator, thereby enhancing the circular polarization gain of the satellite antenna.

[0013] In one possible implementation, the frequency difference f13 between the first frequency f1 and the resonant point frequency f3 of the third resonance satisfies: f13>100MHz; and the frequency difference f23 between the second frequency f2 and the resonant point frequency f3 of the third resonance satisfies: f23>100MHz.

[0014] In another possible implementation of the present application, when the mobile terminal is in the unfolded state, and the first radiator is arranged in the first housing, the second radiator is arranged in the second housing, and the third radiator is arranged in the third housing, if the satellite antenna is in the working state, the first radiator can be coupled to the floor through one branch of the first tuning circuit to form a first resonant structure, the first resonant structure corresponding to a first frequency; the second radiator can be coupled to the floor through one branch of the second tuning circuit to form a second resonant structure, the second resonant structure corresponding to a second frequency. In addition, the third radiator is used to generate a third resonance. Wherein, the resonant point frequency of the third resonance is within the first communication frequency band of the satellite antenna, the first frequency is higher than the first communication frequency band, and the second frequency is higher than the first communication frequency band. In this way, the first resonant structure formed by the first radiator through the first tuning circuit and the second resonant structure formed by the second radiator through the second tuning circuit can both have a greater impact on the resonant mode of the resonance generated by the third radiator, so as to achieve the purpose of adjusting the directional diagram of the satellite antenna and the circular polarization gain of the satellite antenna, thereby being beneficial to the improvement of the communication performance of the satellite antenna.

[0015] In actual application, when the mobile terminal is in the unfolded state, and the first radiator is arranged in the first housing, the second radiator is arranged in the second housing, and the third radiator is arranged in the third housing, if the satellite antenna is in the working state, the first radiator can be coupled to the floor through one branch of the first tuning circuit to form a first resonant structure, the first resonant structure corresponding to a first frequency; the second radiator can be coupled to the floor through one branch of the second tuning circuit to form a second resonant structure, the second resonant structure corresponding to a second frequency. In addition, the third radiator is used to generate a third resonance. Wherein, the resonant point frequency of the third resonance is within the first communication frequency band of the satellite antenna, the first frequency is higher than the first communication frequency band, and the second frequency is higher than the first communication frequency band. In this way, the first resonant structure formed by the first radiator through the first tuning circuit and the second resonant structure formed by the second radiator through the second tuning circuit can both have a greater impact on the resonant mode of the resonance generated by the third radiator, so as to achieve the purpose of adjusting the directional diagram of the satellite antenna and the circular polarization gain of the satellite antenna, thereby being beneficial to the improvement of the communication performance of the satellite antenna.

[0016] In one possible implementation, the frequency difference f13 between the first frequency f1 and the third frequency f3 satisfies: f13>100MHz. In addition, the frequency difference f23 between the second frequency f2 and the third frequency f3 satisfies: f23>100MHz.

[0017] In a possible embodiment of the present application, when the mobile terminal is in the unfolded state, the first radiator is arranged in the first housing, the second radiator is arranged in the second housing, and the third radiator is arranged in the third housing, if the satellite antenna is in the working state, the first radiator is coupled to the ground plate through one branch of the first tuning circuit to form a first resonant structure, the first resonant structure corresponds to a first frequency. The second radiator is coupled to the ground plate through one branch of the second tuning circuit to form a second resonant structure, the second resonant structure corresponds to a second frequency. The third radiator is used to generate a third resonance, wherein the first frequency and the resonant point frequency of the third resonance are within the first communication frequency band of the satellite antenna, and the second frequency is higher than the first communication frequency band. In this way, the maximum radiation direction of the satellite antenna can be adjusted while improving the circular polarization gain of the satellite antenna.

[0018] In actual application, when the mobile terminal is in the unfolded state, the first radiator is arranged in the first housing, the second radiator is arranged in the second housing, and the third radiator is arranged in the third housing, if the satellite antenna is in the working state, the first radiator can be coupled to the ground plate through one branch of the first tuning circuit to form a first resonant structure, the first resonant structure corresponds to a first frequency; the second radiator can be coupled to the ground plate through one branch of the second tuning circuit to form a second resonant structure, the second resonant structure corresponds to a second frequency. In addition, the third radiator is used to generate a third resonance. Wherein the frequency difference f13 between the first frequency f1 and the resonant point frequency f3 of the third resonance satisfies: f13≤10%*f3, so as to suppress the current of the third radiator through the coupling between the first radiator and the third radiator, thereby adjusting the maximum radiation direction of the directional diagram. The frequency difference f23 between the second frequency f2 and the resonant point frequency f3 of the third resonance satisfies: f23>10%*f3, so as to generate orthogonal polarization radiation field between the ground plate current and the current between the second radiator and the third radiator through the coupling between the second radiator and the third radiator, thereby enhancing the circular polarization gain of the satellite antenna.

[0019] In a possible implementation, the frequency difference f13 between the first frequency f1 and the third frequency f3 satisfies: 0≤f13≤100MHz. In addition, the frequency difference f23 between the second frequency f2 and the third frequency f3 satisfies: f23>100MHz.

[0020] In the mobile terminal provided in the application, the first shell comprises a first supporting surface for supporting the flexible display screen, the second shell comprises a second supporting surface for supporting the flexible display screen, and the third shell comprises a third supporting surface for supporting the flexible display screen. When the first supporting surface and the second supporting surface are coplanar, the third supporting surface intersects the second supporting surface, and the third radiator is arranged in the second shell, that is, the mobile terminal is in a hovering state, if the satellite antenna is in a working state, the first radiator is coupled to the ground plate through another branch of the first tuning circuit to form a fourth resonant structure, and the fourth resonant structure corresponds to a fourth frequency; the second radiator is coupled to the ground plate through another branch of the second tuning circuit to form a fifth resonant structure, and the fifth resonant structure corresponds to a fifth frequency; and the third radiator is used to generate a sixth resonance. The fifth frequency and the resonance point frequency of the sixth resonance are within the second communication frequency band of the satellite antenna, and the fourth frequency is higher than the second communication frequency band. When the mobile terminal is in the hovering state, due to the large size of the ground plate and the vertical distribution of the current of the satellite antenna on the ground plate, circular polarization is realized, and thus the performance of the satellite antenna is improved.

[0021] In actual application, the first shell comprises a first supporting surface for supporting the flexible display screen, the second shell comprises a second supporting surface for supporting the flexible display screen, and the third shell comprises a third supporting surface for supporting the flexible display screen. When the first supporting surface and the second supporting surface are coplanar, the third supporting surface intersects the second supporting surface, and the third radiator is arranged in the second shell, that is, the mobile terminal is in a hovering state, if the satellite antenna is in a working state, the first radiator is coupled to the ground plate through another branch of the first tuning circuit to form a fourth resonant structure, and the fourth resonant structure corresponds to a fourth frequency; the second radiator is coupled to the ground plate through another branch of the second tuning circuit to form a fifth resonant structure, and the fifth resonant structure corresponds to a fifth frequency; and the third radiator is used to generate a sixth resonance. The fifth frequency and the resonance point frequency of the sixth resonance are within the second communication frequency band of the satellite antenna, and the fourth frequency is higher than the second communication frequency band. When the mobile terminal is in the hovering state, due to the large size of the ground plate and the vertical distribution of the current of the satellite antenna on the ground plate, circular polarization is realized, and thus the performance of the satellite antenna is improved.

[0022] In one possible implementation, the frequency difference f46 between the fourth frequency f4 and the resonance point frequency f6 of the sixth resonance can satisfy: f46>100MHz. In addition, the frequency difference f56 between the fifth frequency f5 and the resonance point frequency f6 of the sixth resonance can satisfy: 0≤f56≤100MHz.

[0023] In another possible implementation of the present application, in the mobile terminal provided by the present application, the first shell comprises a first support surface for supporting the flexible display screen, the second shell comprises a second support surface for supporting the flexible display screen, and the third shell comprises a third support surface for supporting the flexible display screen. When the first support surface and the second support surface are coplanar, the third support surface intersects the second support surface, and the first radiator is arranged on the first shell, the second radiator is arranged on the second shell, and the third radiator is arranged on the second shell, the satellite antenna is in the working state, the first radiator is coupled to the floor through another branch of the first tuning circuit to form a fourth resonant structure, the fourth resonant structure corresponds to a fourth frequency; the second radiator is coupled to the floor through another branch of the second tuning circuit to form a fifth resonant structure, the fifth resonant structure corresponds to a fifth frequency; and the third radiator is used to generate a sixth resonance. The fifth frequency and the resonant point frequency of the sixth resonance are within the second communication frequency band of the satellite antenna, and the fourth frequency is higher than the second communication frequency band. When the mobile terminal is in the hovering state, due to the large size of the floor and the vertical distribution of the current of the satellite antenna on the floor, circular polarization is achieved, thereby improving the performance of the satellite antenna.

[0024] In actual application, the first shell comprises a first support surface for supporting the flexible display screen, the second shell comprises a second support surface for supporting the flexible display screen, and the third shell comprises a third support surface for supporting the flexible display screen. When the first support surface and the second support surface are coplanar, the third support surface intersects the second support surface, and the first radiator is arranged on the first shell, the second radiator is arranged on the second shell, and the third radiator is arranged on the second shell, the satellite antenna is in the working state, the first radiator is coupled to the floor through another branch of the first tuning circuit to form a fourth resonant structure, the fourth resonant structure corresponds to a fourth frequency; the second radiator is coupled to the floor through another branch of the second tuning circuit to form a fifth resonant structure, the fifth resonant structure corresponds to a fifth frequency; and the third radiator is used to generate a sixth resonance. The fifth frequency and the resonant point frequency of the sixth resonance are within the second communication frequency band of the satellite antenna, and the fourth frequency is higher than the second communication frequency band. When the mobile terminal is in the hovering state, due to the large size of the floor and the vertical distribution of the current of the satellite antenna on the floor, circular polarization is achieved, thereby improving the performance of the satellite antenna.

[0025] In a possible implementation, a frequency difference f46 between the fourth frequency f4 and a resonant point frequency f6 of the sixth resonance satisfies: f46>100MHz. In addition, a frequency difference f56 between the fifth frequency f5 and the resonant point frequency f6 of the sixth resonance satisfies: f56≤100MHz.

[0026] In a possible implementation of the present application, the first shell includes a first support surface for supporting the flexible display screen, the second shell includes a second support surface for supporting the flexible display screen, and the third shell includes a third support surface for supporting the flexible display screen. When the first support surface and the second support surface are coplanar, the third support surface intersects the second support surface, and the first radiator is arranged in the first shell, the second radiator is arranged in the second shell, and the third radiator is arranged in the second shell, the satellite antenna is in the working state, the first radiator is coupled to the floor through the other branch of the first tuning circuit to form a fourth resonant structure, the fourth resonant structure corresponds to the fourth frequency; the second radiator is coupled to the floor through the other branch of the second tuning circuit to form a fifth resonant structure, the fifth resonant structure corresponds to the fifth frequency; and the third radiator is used to generate a sixth resonance, wherein the fourth frequency, the fifth frequency, and a resonant point frequency of the sixth resonance are all within the second communication frequency band of the satellite antenna. In this way, the current of the satellite antenna can still be vertically distributed on the floor, so that circular polarization is achieved, and thus the performance of the satellite antenna is improved, and the maximum radiation direction of the radiation pattern can also be adjusted.

[0027] In actual application, the first shell includes a first support surface for supporting the flexible display screen, the second shell includes a second support surface for supporting the flexible display screen, and the third shell includes a third support surface for supporting the flexible display screen. When the first support surface and the second support surface are coplanar, the third support surface intersects the second support surface, and the first radiator is arranged in the first shell, the second radiator is arranged in the second shell, and the third radiator is arranged in the second shell, the satellite antenna is in the working state, the first radiator is coupled to the floor through the other branch of the first tuning circuit to form a fourth resonant structure, the fourth resonant structure corresponds to the fourth frequency; the second radiator is coupled to the floor through the other branch of the second tuning circuit to form a fifth resonant structure, the fifth resonant structure corresponds to the fifth frequency; and the third radiator is used to generate a sixth resonance, wherein a frequency difference f46 between the fourth frequency f4 and a resonant point frequency f6 of the sixth resonance satisfies: f46≤10%*f6. In addition, a frequency difference f56 between the fifth frequency f5 and the resonant point frequency f6 of the sixth resonance satisfies: f56≤10%*f6. In this way, circular polarization can still be achieved, the performance of the satellite antenna can be improved, and the maximum radiation direction of the radiation pattern can also be adjusted.

[0028] In one possible implementation, a frequency difference f46 between the fourth frequency f4 and a resonant point frequency f6 of the sixth resonance satisfies: 0≤f46≤100MHz. In addition, a frequency difference f56 between the fifth frequency f5 and the resonant point frequency f6 of the sixth resonance satisfies: 0≤f56≤100MHz.

[0029] When the mobile terminal is in the hovering state in the above implementation, an included angle a between the third support surface and the second support surface satisfies: 45°≤a≤135°, for example, 60°≤a≤120° or 80°≤a≤100°, and in actual applications, a can be equal to 90°.

[0030] In another possible implementation of the present application, the first shell includes a first support surface for supporting the flexible display screen, the second shell includes a second support surface for supporting the flexible display screen, and the third shell includes a third support surface for supporting the flexible display screen. When the first support surface and the second support surface are coplanar and the third support surface is opposite to the second support surface, that is, when the mobile terminal is in a folded state, if the satellite antenna is in a working state, the first radiator is coupled to the ground plate through another branch of the first tuning circuit to form a seventh resonance structure, the seventh resonance structure corresponds to a seventh frequency, the second radiator is coupled to the ground plate through another branch of the second tuning circuit to form an eighth resonance structure, the eighth resonance structure corresponds to an eighth frequency, and the third radiator is used to generate a ninth resonance. The resonant point frequency of the ninth resonance is within the third communication frequency band of the satellite antenna, the resonant point frequency of the seventh resonance is higher than the third communication frequency band, and the resonant point frequency of the eighth resonance is higher than the third communication frequency band. When the mobile terminal is in the folded state, the second radiator can act as a parasitic radiator of the third radiator. Because the distribution of the current excited by the first resonance structure formed by the second radiator through the first tuning circuit is similar to the distribution of the current excited by the ninth resonance generated by the third radiator, the second radiator can effectively reduce the decline of the radiation efficiency of the satellite antenna caused by the folding of the third shell, so that the satellite antenna can still meet certain communication requirements.

[0031] In addition, when the mobile terminal is in the folded state, the third radiator can be arranged in the second shell, or arranged in the third shell or the first shell. The second radiator can act as a parasitic radiator of the third radiator, so as to reduce the decline of the radiation efficiency of the satellite antenna caused by the folding of the third shell, so that the satellite antenna can still meet certain communication requirements.

[0032] In actual application, the first shell comprises a first supporting surface for supporting the flexible display screen, the second shell comprises a second supporting surface for supporting the flexible display screen, and the third shell comprises a third supporting surface for supporting the flexible display screen. When the first supporting surface and the second supporting surface are coplanar, the third supporting surface is opposite to the second supporting surface, that is, the mobile terminal is in a folded state, if the satellite antenna is in a working state, the first radiator is coupled to the ground plate through another branch of the first tuning circuit to form a seventh resonant structure, the seventh resonant structure corresponds to a seventh frequency, the second radiator is coupled to the ground plate through another branch of the second tuning circuit to form an eighth resonant structure, the eighth resonant structure corresponds to an eighth frequency, and the third radiator is used to generate a ninth resonance. Wherein, a frequency difference f79 between the seventh frequency f7 and a resonant point frequency f9 of the ninth resonance satisfies: f79>10%*f9, so as to make the ground current and the current between the first radiator and the third radiator produce an orthogonal polarization radiation field through the coupling between the first radiator and the third radiator, thereby enhancing the circular polarization gain of the satellite antenna. In addition, a frequency difference f89 between the eighth frequency f8 and the resonant point frequency f9 of the ninth resonance satisfies: f89>10%*f9, so as to make the ground current and the current between the first radiator and the third radiator produce an orthogonal polarization radiation field through the coupling between the second radiator and the third radiator, thereby enhancing the circular polarization gain of the satellite antenna. In this way, the effect of the decrease of the radiation efficiency of the satellite antenna caused by the folding of the third shell can be reduced, so that the satellite antenna can still meet certain communication requirements.

[0033] Specifically, a frequency difference f79 between the seventh frequency f7 and a resonant point frequency f9 of the ninth resonance satisfies: f79>100MHz. In addition, a frequency difference f89 between the eighth frequency f8 and the resonant point frequency f9 of the ninth resonance satisfies: f89>100MHz.

[0034] In the present application, the satellite antenna further comprises a first feeding point, so that the satellite radio frequency link can be coupled to the third radiator through the first feeding point. When the first radiator is arranged on the first shell, the second radiator is arranged on the third shell, and the third radiator is arranged on the second shell, the distance between the first feeding point and the axis of the first rotating shaft structure is greater than the distance between the first feeding point and the axis of the second rotating shaft structure. In this way, the radiation pattern of the satellite antenna can be strengthened in the direction of the third shell, so that the desired radiation pattern can be obtained, which is beneficial to the improvement of the radiation efficiency of the satellite antenna.

[0035] In a possible implementation manner of the present application, the satellite antenna further comprises a third switch assembly, which is coupled to the third radiator. In this way, the transmitting state and the receiving state of the satellite antenna can be switched by switching the conduction state of the third switch assembly. For example, when the third switch assembly is in a first conduction state, the satellite antenna is in a transmitting state; and when the third switch assembly is in a second conduction state, the satellite antenna is in a receiving state.

[0036] In addition, when the satellite antenna is in the transmitting state, the first radiator can be connected to the first branch of the first tuning circuit. When the satellite antenna is in the receiving state, the first radiator can be connected to the second branch of the first tuning circuit. Thus, when the satellite antenna is in the transmitting state and the receiving state, the first radiator can be controlled through the corresponding branch of the first tuning circuit, respectively, so as to meet the communication requirements of the satellite antenna and improve the intelligence of the antenna system.

[0037] In another possible implementation manner of the present application, when the satellite antenna is in the transmitting state or the receiving state, the first radiator can also be connected to the same branch of the first tuning circuit. In this way, the communication requirements of the mobile terminal can be met, and the antenna system can be simplified.

[0038] As described above, the mobile terminal provided by the present application has at least two folding states. For any two folding states, when the satellite antenna is in the working state, the first radiator can be connected to different branches of the first tuning circuit, and the second radiator can be connected to different branches of the second tuning circuit. In this way, the first frequency corresponding to the first resonant structure formed by the first tuning circuit and the second frequency corresponding to the second resonant structure formed by the second tuning circuit meet the relationship with the resonant point frequency of the resonance generated by the third radiator, so as to improve the radiation efficiency of the satellite antenna when the mobile terminal is in each folding state.

[0039] In another possible implementation manner, when the mobile terminal is in different folding states and the satellite antenna is in the working state, the first radiator can also be connected to the same branch of the first tuning circuit. For example, the first radiator can be connected to the branch for making the resonant point frequency f of the first radiator meet 2500MHz≤f≤2700MHz, so that the first radiator works in the fixed working frequency band when the mobile terminal is in each folding state. In this way, the communication requirements of the mobile terminal in different folding states can be met, and the antenna system can be simplified.

[0040] In the present application, when the mobile terminal is in different folding states and the satellite antenna is in the working state, the first radiator is connected to the same branch of the first tuning circuit. It can be understood that when the mobile terminal is in different folding states, the state of the first tuning circuit is controlled through the fixed working frequency band. For example, the antenna system can also include a cellular radio frequency link. The mobile terminal can control the state of the first tuning circuit through the cellular radio frequency link, so that the first tuning circuit controls the first radiator to work in the fixed working frequency band.

[0041] In a possible implementation of the present application, when the satellite antenna is in the non-working state, the first radiator is coupled to the first antenna radio frequency link and is used to generate a first resonance, and a resonance point frequency of the first resonance is within a communication frequency band of the first antenna. In actual application, the first antenna radio frequency link can be a cellular radio frequency link, and when the satellite antenna is in the non-working state, the first radiator is used as a radiator of the cellular antenna. When the satellite antenna is in the working state, the first radiator can form a resonance structure with the first tuning circuit to affect a directional diagram of the satellite antenna. It can be understood that the frequency corresponding to the first resonance structure when the satellite antenna is in the working state can be the same as the resonance point frequency of the first resonance generated by the first radiator when the satellite antenna is in the non-working state, so that the multiplexing of the cellular antenna can be realized, and the purpose of simplifying the antenna system can be achieved.

[0042] In addition, in the present application, the mobile terminal can control the state of the second tuning circuit through the cellular radio frequency link or the satellite link, so that the second radiator generates a corresponding resonance.

[0043] In another possible implementation of the present application, the antenna system further includes a cellular radio frequency link, the first radiator includes a second feeding point, and the cellular radio frequency link is coupled to the second feeding point. When the mobile terminal is in the closed state and the satellite antenna is in the non-working state, the second radiator is used as a radiator of the cellular antenna, at this time, the resonance point frequency of the third radiator can be greater than the resonance point frequency of the first radiator, and the resonance point frequency of the second radiator can be greater than the resonance point frequency of the first radiator. In this way, the second radiator and the third radiator can both be used as parasitic radiators of the first radiator, so as to improve the resonance efficiency of the first radiator, and thus improve the cellular communication performance of the antenna system. BRIEF DESCRIPTION OF DRAWINGS

[0044] Figure 1 A schematic diagram of satellite communication of the mobile terminal in the embodiment of the present application;

[0045] Figure 2 A structural schematic diagram of the mobile terminal in the unfolded state provided by the embodiment of the present application;

[0046] Figure 3 A structural schematic diagram of the mobile terminal in the hovering state provided by the embodiment of the present application;

[0047] Figure 4 A structural schematic diagram of the mobile terminal in the unfolded state provided by the embodiment of the present application;

[0048] Figure 5a A distribution structural schematic diagram of the antenna system when the mobile terminal is in the unfolded state provided by the embodiment of the present application;

[0049] Figure 5bAnother distribution structure schematic diagram of an antenna system when a mobile terminal is in a folded state is provided in the embodiments of the present application;

[0050] Figure 6a Another distribution structure schematic diagram of an antenna system when a mobile terminal is in a folded state is provided in the embodiments of the present application;

[0051] Figure 6b Another distribution structure schematic diagram of an antenna system when a mobile terminal is in a folded state is provided in the embodiments of the present application;

[0052] Figure 7a Another distribution structure schematic diagram of an antenna system when a mobile terminal is in a folded state is provided in the embodiments of the present application;

[0053] Figure 7b A Figure 7a An enlarged view of a partial structure at B of the structure shown in the figure;

[0054] Figure 7c Another distribution structure schematic diagram of an antenna system when a mobile terminal is in a folded state is provided in the embodiments of the present application;

[0055] Figure 8 Another distribution structure schematic diagram of an antenna system when a mobile terminal is in a folded state is provided in the embodiments of the present application;

[0056] Figure 9 A Figure 8 A schematic diagram of a directional diagram when a satellite antenna of the mobile terminal shown in the figure is in a transmitting state;

[0057] Figure 10 A Figure 6a A schematic diagram of a directional diagram when a satellite antenna of the mobile terminal shown in the figure is in a transmitting state;

[0058] Figure 11 A Figure 7a A schematic diagram of a directional diagram when a satellite antenna of the mobile terminal shown in the figure is in a transmitting state.

[0059] Reference signs:

[0060] 100 - foldable support; 1 - first housing; 101 - first support surface; 2 - second housing; 201 - second support surface; 3 - third housing;

[0061] 301 - third support surface; 4 - first rotating shaft mechanism; 5 - second rotating shaft mechanism;

[0062] 6 - first radiator; 7 - second radiator; 8 - third radiator; 9 - first feeding point; 10 - first switch assembly;

[0063] SW1 - first switching device; SW2 - second switching device; 11 - second switching assembly; SW3 - third switching device; C1 - first capacitor;

[0064] SW4 - fourth switching device; 12 - third switching assembly; SW5 - fifth switching device; C2 - second capacitor; SW6 - sixth switching device;

[0065] 200 - flexible display screen. DETAILED DESCRIPTION

[0066] In order to make the purposes, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the drawings.

[0067] The terminology used in the following embodiments is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application. As used in the description of the application and the appended claims, the singular forms "a", "an" and "the" are intended to include both the singular as well as the plural forms, unless the context clearly indicates otherwise.

[0068] Reference throughout this specification to "one embodiment", "certain embodiments", or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the present application. The appearances of the phrases "in one embodiment" or "in certain embodiments" in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily referring to the same implementation of the invention.

[0069] In order to facilitate the understanding of the mobile terminal provided by the embodiments of the present application, the application scenario thereof will be introduced first as follows.

[0070] Figure 1 The schematic diagram of the mobile terminal in the embodiments of the present application for satellite communication is shown in FIG. 2. Figure 1As shown, the communication satellite communication belongs to non terrestrial network (NTN) communication, and can be used for communication with a mobile terminal. Compared with ground communication, the communication satellite communication can provide wider coverage. Especially for an area where a cellular communication base station layout is less or difficult to cover, the communication satellite can be used for communication. According to the orbital height of the satellite, the satellite communication system can be divided into three kinds as follows: geostationary earth orbit (GEO) satellite communication system (also called synchronous orbit communication satellite), medium earth orbit (MEO) satellite communication system and low earth orbit (LEO) satellite communication system. The GEO satellite has an orbital height of 35786 km, and its main advantage is that it can remain relatively stationary on the ground and can provide a larger coverage area. The MEO satellite has an orbital height of 2000-35786 km, and its advantage is that global coverage can be achieved by a relatively small number of satellites. In view of the advantages and disadvantages of MEO satellite communication, at present, MEO satellites are mainly used for positioning and navigation. The LEO satellite has an orbital height in the range of 300-2000 km. The LEO satellite has a lower orbital height than the MEO and GEO, and has the advantages of small data propagation delay, small transmission loss and relatively low launch cost.

[0071] With the maturity of satellite communication technology, it is gradually applied to various types of mobile terminals. For example, a satellite antenna can be provided in a currently popular foldable mobile terminal product to realize the satellite communication function of the foldable mobile terminal.

[0072] At present, in order to meet the requirements of users for large display screen and portability of foldable mobile terminals, three-fold or even four-fold, five-fold and other multi-fold foldable mobile terminal products are gradually applied to people's daily life. Taking a three-fold mobile terminal as an example, referring to Figure 2 , Figure 2 A structural schematic diagram of a mobile terminal in a flat state provided by an embodiment of the present application is shown. The mobile terminal can include a foldable support 100 and a flexible display screen 200, and the flexible display screen 200 is installed on the foldable support 100. In addition, in the flat state, the flexible display screen 200 is in a fully unfolded state, and at this time, the display area of the mobile terminal is the largest.

[0073] Referring to Figure 2The foldable support 100 of the mobile terminal can include three housings and two rotating shaft mechanisms. For ease of illustration, the three housings are respectively named as a first housing 1, a second housing 2 and a third housing 3, and the two rotating shaft mechanisms are respectively named as a first rotating shaft mechanism 4 and a second rotating shaft mechanism 5. The first rotating shaft mechanism 4 is located between the first housing 1 and the second housing 2, and the first housing 1 and the second housing 2 are rotationally connected through the first rotating shaft mechanism 4. The second rotating shaft mechanism 5 is located between the second housing 2 and the third housing 3, and the second housing 2 and the third housing 3 are rotationally connected through the second rotating shaft mechanism 5. When the mobile terminal is in use, the first housing 1 and the second housing 2 can rotate towards or away from each other under the action of the first rotating shaft mechanism 4, and the second housing 2 and the third housing 3 can rotate towards or away from each other under the action of the second rotating shaft mechanism 5, so that the mobile terminal can be closed and unfolded according to different use scenarios.

[0074] In order to realize communication by using a communication satellite, it is necessary to first establish a communication connection between the satellite antenna of the mobile terminal and the communication satellite, and the radiation pattern of the satellite antenna is one of the factors affecting the communication connection speed and stability. For different forms of mobile terminals, such as foldable terminal products in different folded states, they usually have different floor sizes, and different floor sizes have different effects on the radiation pattern. Therefore, by analyzing the radiation pattern of the satellite antenna of the mobile terminal in different floor size forms, the design of the satellite antenna can be realized to improve the satellite communication performance of the mobile terminal.

[0075] Therefore, the mobile terminal provided in the present application uses multiple radiators to jointly generate a target radiation pattern of a satellite antenna, so as to optimize the radiation pattern of the satellite antenna and improve the communication performance of the satellite antenna.

[0076] In the present application, the foldable mobile terminal can include but is not limited to a mobile phone, a tablet computer, a notebook computer, an e-book reader, a camera, a wearable device or a household electronic device, etc. For ease of understanding, in each embodiment of the present application, the foldable mobile terminal is taken as a mobile phone as an example for illustration.

[0077] In the present application, the first housing 1, the second housing 2 and the third housing 3 can form mounting spaces, respectively, for mounting electronic components of the mobile terminal, such as a circuit board, a battery, a receiver, a speaker or a camera. The circuit board can integrate electronic components of the electronic device, such as a main controller, a storage unit, an antenna module and a power management module, and the battery can supply power to the electronic components, such as the flexible display 200, the circuit board, the receiver, the speaker and the camera. In one possible design, at least two of the first housing 1, the second housing 2 and the third housing 3 are provided with mounting spaces to distribute the components of the mobile terminal in the housings. In another possible design, only one of the first housing 1, the second housing 2 and the third housing 3 is provided with a mounting space to concentrate the components of the mobile terminal in the housing.

[0078] The flexible display 200 can be used to display information and provide an interactive interface for a user. In the embodiments of the present application, the flexible display 200 can be, but is not limited to, an organic light-emitting diode (OLED) display, an active-matrix organic light-emitting diode (AMOLED) display, a mini organic light-emitting diode display, a micro organic light-emitting diode display, a micro organic light-emitting diode display, a quantum dot light emitting diode (QLED) display or the like.

[0079] In addition, the following terms that can appear in the embodiments of the present application are explained for the convenience of understanding the present application.

[0080] Since the foldable mobile terminal includes various forms in use, for example, the foldable mobile terminal includes an unfolded state, a hovering state and a folded state. For the convenience of description, it is considered that the angle between the first housing 1 and the second housing 2 is a first angle, and the angle between the second housing 2 and the third housing 3 is a second angle.

[0081] Unfolded state: refers to a state in which the first housing 1, the second housing 2 and the third housing 3 of the foldable mobile terminal are completely unfolded, as shown in FIG. 1A. Figure 2As shown, in the flat state, the first angle between the first shell 1 and the second shell 2 can be between 175° and 185°, and the second angle between the second shell 2 and the third shell 3 can be between 175° and 185°, and specifically, the first angle between the first shell 1 and the second shell 2 can be 180°, and the second angle between the second shell 2 and the third shell 3 can be 180°.

[0082] Hover state: refers to a state in which the first shell 1 and the second shell 2 are unfolded to a certain angle but are not completely flat. Referring to Figure 3 , Figure 3 A structure diagram of a mobile terminal in a hover state is provided in the embodiments of the present application, in which the first angle between the first shell 1 and the second shell 2 can be between 45° and 175°, and the second angle between the second shell 2 and the third shell 3 can be between 45° and 175°.

[0083] Folded state: can also be referred to as closed state, in which the first shell 1 and the second shell 2 of the foldable mobile terminal are completely folded and closed, and the second shell 2 and the third shell 3 are completely folded and closed, so that the first angle is 0° and the second angle is 0°; or in some embodiments, the first angle between the first shell 1 and the second shell 2 can also be between 0° and 45°, and in addition, the second angle between the second shell 2 and the third shell 3 can also be between 0° and 45°.

[0084] Radiating body: is a device in an antenna for receiving / sending electromagnetic wave radiation. In some cases, "antenna" is understood in a narrow sense as a radiating body, which changes the waveguide energy from a transmitter into radio waves, or converts radio waves into waveguide energy, for radiating and receiving radio waves. The modulated high-frequency current energy (or waveguide energy) generated by the transmitter is transmitted to the transmitting radiating body through the feeder, and is converted into electromagnetic wave energy of a certain polarization through the radiating body and radiated in the desired direction. The receiving radiating body converts electromagnetic wave energy of a certain polarization from a certain direction in space into modulated high-frequency current energy, and delivers it to the input end of the receiver through the feeder.

[0085] Ground / ground plate: can refer to at least a portion of any ground layer, or ground plate, or ground metal layer, or any combination of the above in a communication terminal (such as a mobile phone), and can be used for grounding of components in the communication terminal. In one embodiment, the "ground / ground plate" can include any one or more of the following: a ground layer of a circuit board of the communication terminal, a ground plate formed by a frame of the communication terminal, a ground metal layer formed by a metal film under the screen, a conductive ground layer of the battery, and a conductive or metallic part electrically connected to the above ground layer / ground plate / metal layer. In one embodiment, the circuit board can be a printed circuit board (PCB), such as an 8-layer, 10-layer, or 12-14 layer board having 8, 10, 12, 13, or 14 layers of conductive material, or elements separated and electrically insulated by a dielectric or insulating layer such as fiberglass, polymer, etc.

[0086] Any ground layer, or ground plate, or ground metal layer described above can be made of a conductive material. In one embodiment, the conductive material can be any one of the following: copper, aluminum, stainless steel, brass and their alloys, copper foil on an insulating substrate, aluminum foil on an insulating substrate, gold foil on an insulating substrate, silver-plated copper, silver-plated copper foil on an insulating substrate, silver foil on an insulating substrate, and tin-plated copper, graphite powder impregnated cloth, graphite coated substrate, copper plated substrate, brass plated substrate, and aluminum plated substrate. Those skilled in the art can understand that the ground layer / ground plate / ground metal layer can also be made of other conductive materials.

[0087] The housing of the mobile terminal includes a frame, which is circumferentially arranged around the periphery of the housing. The frame mainly including a conductive material can be referred to as a conductive frame or a metal frame of the mobile terminal, which is suitable for an industrial design (ID) of a metal appearance. In one implementation, the outer surface of the frame is mainly made of a conductive material, such as a metal material, so as to form an appearance of a metal frame. In these implementations, the conductive part including the outer surface in the frame can be used as an antenna radiator of the mobile terminal, and is usually referred to as a frame antenna.

[0088] In another implementation, the outer surface of the bezel is mainly non-conductive material, such as plastic, forming the appearance of a non-metallic bezel, suitable for non-metallic IDs. In one implementation, the inner surface of the bezel can include a conductive material, such as a metallic material. In this implementation, the conductive portion of the inner surface of the bezel can be used as an antenna radiator of the mobile terminal. It should be understood that the radiator provided on the inner surface of the bezel (or the conductive material of the inner surface) can be arranged against the non-conductive material of the bezel to minimize the volume occupied by the radiator and be closer to the outside of the mobile terminal to achieve better signal transmission effect, and can also be referred to as a bezel antenna. It should be noted that the antenna radiator arranged against the non-conductive material of the bezel means that the antenna radiator can be arranged against the inner surface of the non-conductive material, or can be embedded in the non-conductive material, or can be arranged close to the inner surface of the non-conductive material, for example, the antenna radiator and the inner surface of the non-conductive material can have a small gap. It should be understood that the conductive material and the non-conductive material can be regarded as part of the bezel.

[0089] Radio frequency chip: is the combination of all components of the antenna for the reception and transmission of radio frequency waves. In the case of a receiving antenna, the radio frequency chip can be considered as the antenna part from the first amplifier to the front transmitter. In a transmitting antenna, the radio frequency chip can be considered as the part after the last power amplifier. In some cases, the radio frequency chip can also be understood as a feed unit. The radio frequency chip has the function of converting radio waves into electrical signals and sending them to the receiver components. Usually, it is considered as part of the antenna system for converting radio waves into electrical signals and vice versa. The antenna design should consider the maximum power transmission possibility and efficiency. For this purpose, the antenna feed impedance must be matched to the load resistance. The antenna feed impedance is a combination of resistance, capacitance and inductance. To ensure maximum power transmission conditions, the two impedances (load resistance and feed impedance) should be matched. The matching can be done by considering the frequency requirements and the design parameters of the antenna (such as gain, directivity and radiation efficiency).

[0090] Feed source / feed circuit, is the combination of all circuits for the reception and transmission of radio frequency signals. The feed circuit can include a transceiver and a radio frequency front end circuit (RF front end). In some cases, the "feed circuit" is understood in a narrow sense as a radio frequency integrated circuit (RFIC), which can be considered to include a radio frequency front-end chip and a transceiver. The feed circuit has the function of converting radio waves (for example, radio frequency signals) and electrical signals (for example, digital signals). Usually, it is considered as part of the radio frequency.

[0091] In some embodiments, a test seat (or referred to as a radio frequency seat or a radio frequency test seat) can also be included in the electronic device. The test seat can be used to insert a coaxial cable to test the characteristics of the radio frequency front-end circuit or the radiator of the antenna through the cable. The radio frequency front-end circuit can be considered as a circuit portion coupled between the test seat and the transceiver.

[0092] In some embodiments, the radio frequency front-end circuit can be integrated as a radio frequency front-end chip in the electronic device, or the radio frequency front-end circuit and the transceiver can be integrated as a radio frequency chip in the electronic device.

[0093] It should be understood that any two of the first / second / … / Nth feed circuits in the present application can share the same transceiver, for example, transmitting signals through one radio frequency channel (for example, one port (pin) of a radio frequency chip) in one transceiver; and can also share one radio frequency front-end circuit, for example, processing signals through a switch or an amplifier in one radio frequency front-end circuit.

[0094] It should also be understood that two of the first / second / … / Nth feed circuits in the present application generally correspond to two radio frequency test seats in the electronic device.

[0095] Feed line: also called transmission line, refers to the connection line between the radio frequency chip and the radiator of the antenna. The transmission line can directly transmit current waves or electromagnetic waves according to different frequencies and forms. The connection between the radiator and the transmission line is usually referred to as a feed point. The transmission line includes a wire transmission line, a coaxial transmission line, a waveguide, or a microstrip line, etc. The transmission line can include a support antenna body or a glass antenna body according to the implementation form. The transmission line can be realized by liquid crystal polymer (LCP), flexible printed circuit (FPC), or printed circuit board (PCB) according to the carrier.

[0096] Resonant frequency: resonant frequency is also called resonance frequency. The resonant frequency can have a frequency range, i.e., a frequency range in which resonance occurs. The resonant frequency can be a frequency range in which the return loss characteristic is less than -6 dB. The strongest point of resonance can be referred to as a resonance point, and the frequency corresponding to the resonance point is the center frequency point frequency. The return loss characteristic of the center frequency can be less than -20 dB. It should be understood that, unless otherwise specified, the antenna / radiator mentioned in the present application produces “first / second / … / Nth resonance”, wherein the first resonance should be the fundamental mode resonance produced by the antenna / radiator, or in other words, the resonance with the lowest frequency produced by the antenna / radiator. It should be understood that the antenna / radiator can produce one or more antenna modes according to the specific design, and each antenna mode can correspond to produce a fundamental mode resonance.

[0097] Resonant frequency band: the range of resonant frequencies, the echo loss characteristic of any frequency point in the resonant frequency band can be less than -6dB or -5dB.

[0098] Communication frequency band / working frequency band: no matter what type of antenna, it always works in a certain frequency range (bandwidth). For example, an antenna supporting B40 frequency band, its working frequency band includes the frequency in the range of 2300MHz-2400MHz, or in other words, the working frequency band of the antenna includes B40 frequency band. The frequency range that meets the index requirements can be regarded as the working frequency band of the antenna. The width of the working frequency band is called the working bandwidth. The working bandwidth of an omnidirectional antenna can reach 3-5% of the center frequency. The working bandwidth of a directional antenna can reach 5-10% of the center frequency. The bandwidth can be considered as a range of frequencies on both sides of the center frequency (for example, the resonant frequency of a dipole), in which the antenna characteristics are within the acceptable value range of the center frequency.

[0099] The resonant frequency band and the working frequency band can be the same or different, or their frequency ranges can partially overlap. In one embodiment, the resonant frequency band of an antenna can cover multiple working frequency bands of the antenna.

[0100] Medium wavelength: refers to the wavelength of electromagnetic waves propagating in the medium at the working frequency band. For example, the working frequency band is [f1, f2], and the corresponding medium wavelength is also a range value [w1, w2]. Or, in order to simplify the calculation, the above medium wavelength can also refer to the wavelength of electromagnetic waves propagating in the medium at the center frequency f0 of the working frequency band, at this time, the medium wavelength is a specific value w0.

[0101] Antenna echo loss: can be understood as the ratio of the signal power reflected back to the antenna port to the antenna port transmission power. The smaller the signal reflected back, the greater the signal radiated into space through the antenna, and the greater the radiation efficiency of the antenna. The greater the signal reflected back, the smaller the signal radiated into space through the antenna, and the smaller the radiation efficiency of the antenna.

[0102] The antenna echo loss can be represented by the S11 parameter, which belongs to one of the S parameters. S11 represents the reflection coefficient, and this parameter can represent the pros and cons of the antenna transmission efficiency.

[0103] In one embodiment, the S11 diagram can be understood as a schematic diagram for representing the resonance generated by the antenna. In one embodiment, the resonance shown by the S11 diagram in the part less than -6dB can be understood as the resonance frequency / frequency range / operating frequency band generated by the antenna. The S11 parameter is generally negative, the smaller the S11 parameter, the smaller the antenna return loss, the smaller the energy reflected back by the antenna itself, that is, the more the energy actually entering the antenna, the higher the radiation efficiency of the antenna; the larger the S11 parameter, the larger the antenna return loss, the lower the radiation efficiency of the antenna.

[0104] It should be noted that in engineering, -6dB of S11 value is generally used as a standard. When the S11 value of the antenna is less than -6dB, it can be considered that the antenna can work normally, or it can be considered that the transmission efficiency of the antenna is better.

[0105] Antenna pattern: also known as radiation pattern. It refers to the relative field strength (normalized modulus) of the antenna radiation field at a certain distance from the antenna as a function of direction. It is usually represented by two mutually perpendicular plane patterns through the maximum radiation direction of the antenna.

[0106] The antenna pattern usually has multiple radiation beams. The radiation beam with the maximum intensity is called the main lobe, and the remaining radiation beams are called side lobes or side lobes. In the side lobe, the side lobe in the opposite direction of the main lobe is also called the back lobe.

[0107] Radiation efficiency: refers to the ratio of the power radiated by the antenna into space (i.e. the power of the electromagnetic wave part effectively converted) to the active power input to the antenna. Among them, the active power input to the antenna = the input power of the antenna - the loss power; the loss power mainly includes the return loss power and the ohmic loss power of the metal and / or the dielectric loss power. Metal loss, dielectric loss are the influencing factors of radiation efficiency.

[0108] Those skilled in the art can understand that the radiation efficiency is generally expressed in percentage, and there is a corresponding conversion relationship between dB. The closer the radiation efficiency is to 0dB, the better the radiation efficiency of the antenna.

[0109] dB: decibel, a logarithmic concept with base 10. Decibel is only used to evaluate the ratio between one physical quantity and another physical quantity, and it itself has no physical dimension. The ratio between the two quantities increases by 10 times, and the difference between them can be expressed as 10 decibels. For example: A="100", B="10", C="5", D="1", then A / D=20dB; B / D=10dB; C / D=7dB; B / C=3dB. That is, a difference of 10 decibels between two quantities is a difference of 10 times, a difference of 20 decibels is a difference of 100 times, and so on. A difference of 3dB is a difference of 2 times between two quantities.

[0110] End: The "end" in the first end / second end / third end / fourth end / ground end / open end of the main radiator cannot be understood as a point or end physically disconnected from other radiators, but can also be considered as a section of the main radiator including the first end point, which is the end point of the main radiator at the gap. For example, the first end of the main radiator can be considered as a section of the main radiator within one-eighth of the first wavelength range from the first end point, where the first wavelength can be the wavelength corresponding to the operating frequency band of the main radiator, can be the wavelength corresponding to the center frequency of the operating frequency band, or the wavelength corresponding to the resonance point. In an embodiment, the "end / point" can include a connection / coupling area on the radiator that couples other conductive structures, for example, the feed end / point can be a coupling area (e.g., an area facing a part of the feed structure) on the antenna radiator that couples the feed structure, and for example, the ground end / point can be a connection / coupling area on the antenna radiator that couples the ground structure.

[0111] Open end and closed end: In some embodiments, the open end and the closed end are, for example, relative to whether it is grounded, the closed end is grounded, and the open end is not grounded. In an embodiment, the open end can also be referred to as a suspended end, a free end, an open end, or an open circuit end. In an embodiment, the closed end can also be referred to as a ground end or a short circuit end. It should be understood that in some embodiments, other conductors can be coupled through the open end to transfer coupled energy (which can be understood as transferring current).

[0112] In some embodiments, the open end and the closed end are, for example, relative to other conductive bodies, the closed end is electrically connected to other conductive bodies, and the open end is not electrically connected to other conductive bodies.

[0113] In some embodiments, the "open end" of the radiator can be simply understood as follows: one end of the radiator is spaced apart from the ground plane or coupled to the ground plane through a capacitive device, which can be considered as the open end of the radiator.

[0114] In some embodiments, the "ground end" of the radiator can be simply understood as follows: one end of the radiator is directly connected to the ground plane or coupled to the ground plane through an inductive device, which can be considered as the ground end of the radiator.

[0115] In some embodiments, the understanding of the "closed end" can also be from the current distribution, and the closed end or the ground end can be understood as a large current point on the radiator or a small electric field point on the radiator; in an embodiment, coupling electronic devices (e.g., inductive devices) through the closed end can not change the current distribution characteristics of the large current point / small electric field point; in an embodiment, opening a slot (e.g., a gap filled with insulating material) at or near the closed end can not change the current distribution characteristics of the large current point / small electric field point.

[0116] In some embodiments, the understanding of "open end" can also be from the perspective of current distribution, and the open end or floating end, etc. can be understood as a small current point on the radiator, and can also be understood as a large electric field point on the radiator. In an embodiment, coupling an electronic device (e.g., a capacitive device, etc.) through the open end can not change the current distribution characteristics of the small current point / large electric field point.

[0117] It should be understood that coupling an electronic device (e.g., a capacitor, an inductor, etc.) at a radiator end of a gap (from the structure of the radiator, similar to the radiator at the opening of the open end or floating end) can make the radiator end a large current point / small electric field point, and in this case, it should be understood that the radiator end at the gap is actually a closed end or a grounded end, etc.

[0118] Capacitor: can be understood as lumped capacitance and / or distributed capacitance. Lumped capacitance includes components that are capacitive, such as a capacitor element; distributed capacitance (or distributed capacitance) includes an equivalent capacitor formed by two conductive pieces spaced apart by a gap.

[0119] In an embodiment of the present application, the wavelength in a certain wavelength mode (such as a half-wavelength mode, etc.) of an antenna can refer to the wavelength of a signal radiated by the antenna. It should be understood that the wavelength of the radiated signal in air can be calculated as follows: wavelength = speed of light / frequency, where the frequency is the frequency of the radiated signal. The wavelength of the radiated signal in a medium can be calculated as follows: where ε is the relative permittivity of the medium, and frequency is the frequency of the radiated signal.

[0120] Coupling: in the present application, it can be understood as indirect coupling, and "coupled connection" can be understood as indirect coupled connection. "Indirect coupling" can be understood as electrical conduction between two conductors through space / without contact. In an embodiment, indirect coupling can also be referred to as capacitive coupling, for example, through the coupling between the gap between two conductive pieces to form an equivalent capacitor to achieve signal transmission.

[0121] The definitions such as symmetry (e.g., axial symmetry, or central symmetry, etc.), parallel, vertical, same (e.g., same length, same width, etc.) mentioned in the embodiments of the present application are for the current process level, not the absolute definition in the mathematical sense. There can be a predetermined angle deviation between two structures that are parallel or vertical to each other. In an embodiment, the predetermined threshold can be less than or equal to 1 mm, for example, the predetermined threshold can be 0.5 mm, or it can be 0.1 mm. In an embodiment, the predetermined angle can be an angle within ±10°, for example, the predetermined angle deviation is ±5°.

[0122] It is worth mentioning that the "perpendicular" in the embodiments of the present application means that there can be a predetermined angle deviation between the two. For example, the predetermined angle can be 85°, 86°, 87°, 88°, 89°, 90°, 91°, 92°, 93°, 94°, or 95°, and the like.

[0123] It is worth mentioning that the "parallel" in the embodiments of the present application means that there can be a predetermined angle deviation between the two. For example, the predetermined angle can be 0°, 0.5°, 1°, 1.5°, 2°, 3°, 4°, 4.5°, or 5°, and the like.

[0124] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application will be further described in detail below with reference to the drawings and specific embodiments.

[0125] Figure 4 A structural schematic diagram of a mobile terminal in a flat state according to an embodiment of the present application is shown in FIG. 1. As shown in FIG. 1, in the embodiment of the present application, the mobile terminal includes a first shell 1, a second shell 2, a third shell 3, a first pivot mechanism 4, and a second pivot mechanism 5, as described above. Figure 4 In addition to the first shell 1, the second shell 2, the third shell 3, the first pivot mechanism 4, and the second pivot mechanism 5, the mobile terminal also includes an antenna system in the embodiment of the present application. The antenna system includes a satellite antenna, which is used to receive / send electromagnetic waves. Specifically, the satellite antenna is used to receive electromagnetic waves from a communication satellite or send electromagnetic waves to the communication satellite. In this way, satellite communication functions of the mobile terminal can be realized through electromagnetic wave transmission between the satellite antenna and the communication satellite. In a specific embodiment, the mobile terminal can realize at least one of satellite short message, satellite telephone, or satellite Internet access through the satellite antenna.

[0126] In a specific arrangement of the satellite antenna, the satellite antenna includes a first radiator 6, a second radiator 7, and a third radiator 8. In the present application, the first radiator 6, the second radiator 7, and the third radiator 8 can be arranged in different shells of the mobile terminal, respectively.

[0127] In addition, along the axial direction of the mobile terminal, the first radiator 6, the second radiator 7, and the third radiator 8 can all be located at one end of the mobile terminal. For example, they can be located at the A end of the mobile terminal as shown in FIG. 1. In the present application, the A end can be a normal use state of the mobile terminal, and the flexible display screen 200 faces the user, so that the relatively upper end of the mobile terminal, which is beneficial to realize the satellite pointing of the satellite antenna. In a specific embodiment, as shown in FIG. 1, the first radiator 6 is arranged at the end of the first shell 1, the second radiator 7 is arranged at the end of the third shell 3, and the third radiator 8 is arranged at the end of the second shell 2. Figure 2 Figure 4

[0128] ​​In order to realize the communication function, the satellite antenna further comprises a satellite radio frequency link, a first tuning circuit and a second tuning circuit, wherein the satellite radio frequency link is coupled to the third radiator 8 to realize the feeding of the third radiator 8 by the satellite radio frequency link, so that the third radiator 8 communicates with the communication satellite as the main radiator of the satellite antenna. The first radiator 6 is coupled to the first tuning circuit, and the second radiator 7 is coupled to the second tuning circuit. It is worth mentioning that the specific positions of the satellite radio frequency link, the first tuning circuit and the second tuning circuit are not limited in the present application, which are exemplarily arranged on the circuit board in the mobile terminal and accommodated in the mounting space formed by the shell.

[0129] In this way, a resonance structure is formed by the first tuning circuit and the first radiator, and another resonance structure is formed by the second tuning circuit and the second radiator 7, so as to influence the resonance mode of the resonance generated by the third radiator 8 through the two resonance structures, so as to achieve the purpose of adjusting the target pattern of the satellite antenna and / or improving the gain of the satellite antenna. By using the design scheme of the antenna system provided in the present application, when the satellite antenna is in the working state, the first radiator 6 and the first tuning circuit, the second radiator 7 and the second tuning circuit, and the third radiator 8 are used to jointly generate the target pattern of the satellite antenna, which is beneficial to realize the optimization of the pattern of the satellite antenna and / or improve the gain of the satellite antenna, so as to improve the communication performance of the satellite antenna.

[0130] It is worth mentioning that the "first radiator 6 and first tuning circuit, second radiator 7 and second tuning circuit, and third radiator 8 are used to jointly generate the target pattern of the satellite antenna" described above can be understood as "the first radiator 6 and the first tuning circuit", "the second radiator 7 and the second tuning circuit" and the third radiator 8 all influence the target pattern of the satellite antenna, for example, influence the maximum radiation direction of the target pattern.

[0131] From the above introduction, it can be known that for the foldable mobile terminal, the floor size is different when it is in different folded states, and different floor sizes have different influences on the pattern. In order to understand the optimization effect of the design scheme of the antenna system provided in the present application on the pattern of the satellite antenna, the communication performance of the satellite antenna of the mobile terminal in different folded states is analyzed.

[0132] Figure 5a The distribution structure of the antenna system of the mobile terminal provided in the present application in the unfolded state is shown in the figure. Figure 5a In the state shown in the figure, the floor of the mobile terminal is composed of the floors of the three shells connected in sequence along the arrangement direction, so that the overall size of the floor of the mobile terminal is the largest. In addition, in the state shown in the figure, the first radiator 6 and the first tuning circuit are arranged on the first floor, the second radiator 7 and the second tuning circuit are arranged on the second floor, and the third radiator 8 is arranged on the third floor. Figure 5aIn the shown antenna system, the third radiator 8 is arranged in the second housing 2, the first radiator 6 is arranged in the first housing 1, and the second radiator 7 is arranged in the third housing 3. In this embodiment, the first radiator 6 is coupled to the floor through a branch of the first tuning circuit to form a first resonant structure, which corresponds to a first frequency. The second radiator 7 is coupled to the floor through a branch of the second tuning circuit to form a second resonant structure, which corresponds to a second frequency. In addition, the third radiator 8 is fed through a satellite radio frequency link, so that the third radiator 8 is used to generate a third resonance.

[0133] It is worth mentioning that in this application, the resonant structure can refer to a structure that itself does not generate resonance or does not generate obvious resonance, but can affect the resonance of the third radiator 8. For example, the resonant structure can guide the resonance current of the third radiator 8 to affect the resonance mode of the third radiator 8.

[0134] In addition, the frequency corresponding to the resonant structure refers to the frequency corresponding to the electrical length of the branch of the tuning circuit to which the radiator is connected. When the resonant structure is fed, the frequency of the resonance that the resonant structure can generate can be considered as the frequency corresponding to the resonant structure. It can be understood that the frequency corresponding to the resonant structure is related to the branch of the tuning circuit to which the radiator is connected.

[0135] And the different branches of the first tuning circuit can be understood as the first tuning circuit having different conduction states, and each conduction state can be considered as a branch of the first tuning circuit. Based on this, the first resonant structure corresponding to the first frequency can be adjusted by connecting the first radiator 6 to the corresponding branch of the first tuning circuit.

[0136] Similarly, the different branches of the second tuning circuit can be understood as the second tuning circuit having different conduction states, and each conduction state can be considered as a branch of the second tuning circuit. In this way, the second resonant structure corresponding to the second frequency can be adjusted by connecting the second radiator 7 to the corresponding branch of the second tuning circuit.

[0137] In one embodiment, in Figure 5a In the shown scheme, the first frequency and the resonance point frequency of the third resonance are both within the first communication frequency band of the satellite antenna. In this way, the current of the third radiator 8 can pass through the first radiator 6 to the ground when flowing to the first radiator 6. Thus, the directional diagram of the satellite antenna is tilted towards the direction of the third housing 3.

[0138] In one embodiment, the second frequency is higher than the resonance point frequency of the third resonance, and the coupling between the second radiator 7 and the third radiator 8 causes the current of the third radiator 8 to flow to the second radiator 7 when the current of the third radiator 8 flows to the first radiator 6. Figure 5aThe arrow (indicated by a single-dotted line) flows towards the second radiator 7, and then towards the floor. Furthermore, due to... Figure 5a In the flattened state shown, the mobile terminal has a large floor size, and the current on the floor (such as...) is... Figure 5a The arrow (indicated by the dashed line) flows in a traveling wave pattern along the edge and floor to generate an orthogonally polarized radiation field. This enhances the circular polarization gain of the satellite antenna, which in turn increases the beamwidth of the radiation pattern to meet the satellite antenna's alignment requirements, thereby improving the satellite antenna's communication performance.

[0139] Understandably, in Figure 5a The image only schematically illustrates the approximate shape of the satellite antenna's radiation pattern and beamwidth. In practical applications, as long as the beamwidth of the upper hemisphere of the satellite antenna's radiation pattern meets regulatory requirements (e.g., greater than or equal to ±15°), the satellite antenna's alignment requirements can be satisfied.

[0140] It is worth noting that this application does not limit the first communication frequency band of the satellite antenna. Exemplary examples include the operating frequency band of the satellite antenna in the receiving state when the mobile terminal is in a flattened state; or the operating frequency band of the satellite antenna in the transmitting state. Furthermore, it is understood that when the satellite antenna communicates with different communication satellites, the operating frequency band of the satellite antenna in the receiving state may be different, and the operating frequency band of the satellite antenna in the transmitting state may also be different. However, the antenna system provided in this application, when the mobile terminal is in a flattened state, can adjust the first frequency, the second frequency, and the resonant frequency of the third radiator 8 according to different application scenarios to satisfy the above relationships. This optimizes the radiation pattern of the satellite antenna under the combined action of the first radiator and the first tuning circuit, the second radiator and the second tuning circuit, and the third radiator, and / or increases the gain of the satellite antenna, thereby improving the satellite communication performance of the mobile terminal.

[0141] In this application, the satellite antenna also includes a first feed point 9, through which the satellite radio frequency link can be coupled to the third radiator 8. Additionally, when the mobile terminal is in... Figure 5a When the object is flattened as shown, and the first radiator 6 is disposed in the first housing 1, the second radiator 7 is disposed in the third housing 3, and the third radiator 8 is disposed in the second housing 2, as shown... Figure 4 As shown, the distance L1 between the first feed point 9 and the axis of the first rotating shaft mechanism 4 is greater than the distance L2 between the first feed point 9 and the axis of the second rotating shaft mechanism 5. This helps to strengthen the radiation pattern of the satellite antenna towards the direction of the third housing 3, thereby improving the radiation efficiency of the satellite antenna.

[0142] In one embodiment, in Figure 5aIn the shown scheme, in order to enable the first resonant structure to suppress the current of the third resonance, the frequency difference f13 between the first frequency fl and the resonant point frequency f3 of the third resonance satisfies: f13≤10%*f3. In a specific embodiment, the frequency difference f13 between the first frequency fl and the resonant point frequency f3 of the third resonance satisfies: 0≤f13≤100MHz, for example, f13=50MHz, f13=65MHz, or f13=90MHz, etc.

[0143] In an embodiment, the frequency difference f23 between the second frequency f2 and the third resonance f3 satisfies: f23>10%*f3, for example, f23≥20%*f3. In this way, the second resonant structure can guide the current of the third resonance to the floor and the frame, so as to enhance the orthogonal polarization characteristics of the current between the floor current and the second radiator 7 and the third radiator 8, thereby facilitating the improvement of the circular polarization gain of the satellite antenna. In a specific embodiment, the frequency difference f23 between the second frequency f2 and the resonant point frequency f3 of the third resonance satisfies: f23>100MHz, for example, f23≥300MHz, such as f23=350MHz, f23=500MHz, f23=600MHz, f23=700MHz, or f23=1000MHz, etc.

[0144] It is worth mentioning that, in the above Figure 5a In the shown embodiment, by setting the first frequency corresponding to the first resonant structure in the first communication frequency band, the directional diagram of the satellite antenna is tilted towards the third shell 3. In another possible embodiment of the present application, when the mobile terminal is in the unfolded state and the third radiator 8 is arranged in the second shell 2, if the satellite antenna is in the working state, the resonant point frequency of the third resonance can also be in the first communication frequency band of the satellite antenna, the first frequency is higher than the first communication frequency band, and the second frequency is higher than the first communication frequency band. In this way, the orthogonal polarization radiation field generated by the floor and the frame radiators can enhance the circular polarization gain of the satellite antenna, thereby improving the communication performance of the satellite antenna.

[0145] In one embodiment, when the mobile terminal is in a flattened state and the third radiator 8 is disposed on the second housing 2, if the satellite antenna is in an operational state, in a possible embodiment of this application, the frequency difference f13 between the first frequency f1 and the resonant frequency f3 of the third resonance can also satisfy: f13 > 10% * f3. For example, f13 ≥ 20% * f3 can be made so that the ground current and the current between the first radiator 6 and the third radiator 8 can generate an orthogonally polarized radiation field through the coupling between the first radiator 6 and the third radiator 8, thereby enhancing the circular polarization gain of the satellite antenna. The frequency difference f23 between the second frequency f2 and the resonant frequency f3 of the third resonance satisfies: f23 > 10% * f3. For example, f23 ≥ 20% * f3 can be made so that the ground current and the current between the second radiator 7 and the third radiator 8 can generate an orthogonally polarized radiation field through the coupling between the second radiator 7 and the third radiator 8, thereby improving the circular polarization gain of the satellite antenna.

[0146] In one embodiment, the frequency difference f13 between the first frequency f1 and the third frequency f3 satisfies: f13 > 100MHz. For example, f13 can be ≥ 300MHz, such as f13 = 350MHz, f13 = 500MHz, f13 = 600MHz, f13 = 700MHz, or f13 = 1000MHz. Furthermore, the frequency difference f23 between the second frequency f2 and the third frequency f3 satisfies: f23 > 100MHz. For example, f23 can be ≥ 300MHz, such as f23 = 350MHz, f23 = 500MHz, f23 = 600MHz, f23 = 700MHz, or f23 = 1000MHz.

[0147] In the above embodiments, the description focuses on the effect of the radiation pattern generated by the three radiators together, using the example of placing the third radiator 8 on the second housing 2. In practical applications, the placement positions of the three radiators can be adjusted according to specific design requirements. For example, refer to... Figure 5b , Figure 5b This is a schematic diagram of another antenna system distribution structure provided in this application embodiment when the mobile terminal is in a flattened state. (Similar to the above...) Figure 5a The mobile terminal shown has different placement positions for each radiator. Figure 5b In the first housing 1, the first radiator 6 is disposed in the first housing 1, the second radiator 7 is disposed in the second housing 2, and the third radiator 8 is disposed in the third housing 3.

[0148] exist Figure 5bIn the embodiment shown, when the satellite antenna is in operation, the first radiator 6 is coupled to the ground plane through a branch of the first tuning circuit to form a first resonant structure, which corresponds to a first frequency. The second radiator 7 is coupled to the ground plane through a branch of the second tuning circuit to form a second resonant structure, which corresponds to a second frequency. The third radiator 8 is used to generate a third resonance.

[0149] In one embodiment, the resonant frequency of the third resonance is within the first communication frequency band of the satellite antenna, but the first frequency and the second frequency are both higher than the first communication frequency band. This allows the first resonant structure formed by the first radiator 6 through the first tuning circuit and the second resonant structure formed by the second radiator 7 through the second tuning circuit to significantly influence the resonant mode of the resonance generated by the third radiator 8, thereby adjusting the radiation pattern and circular polarization gain of the satellite antenna and improving its radiation efficiency.

[0150] Additionally, in one possible embodiment, when the mobile terminal is in Figure 5b In the indicated state, the frequency difference f13 between the first frequency f1 and the resonant frequency f3 of the third resonance can also satisfy: f13 > 10% * f3. For example, f23 ≥ 20% * f3 can be made. This allows the current between the first radiator 6 and the third radiator 8 and the ground current to generate an orthogonally polarized radiation field, thereby enhancing the circular polarization gain of the satellite antenna. In a specific embodiment, the frequency difference f13 between the resonant frequency f1 of the first resonance and the resonant frequency f3 of the third resonance satisfies: f13 > 100MHz. For example, f13 ≥ 300MHz, such as f13 = 350MHz, f13 = 500MHz, f13 = 600MHz, f13 = 700MHz, or f13 = 1000MHz, etc.

[0151] The frequency difference f23 between the second frequency f2 and the resonant frequency f3 of the third resonance satisfies: f23 > 10% * f3. For example, f13 ≥ 20% * f3 can be used. This allows the current between the second radiator 7 and the third radiator 8, and the ground current, to generate an orthogonally polarized radiation field, thereby enhancing the circular polarization gain of the satellite antenna. In a specific embodiment, the frequency difference f23 between the resonant frequency f2 of the second resonance and the resonant frequency f3 of the third resonance satisfies: f23 > 100MHz. For example, f23 ≥ 300MHz, such as f23 = 350MHz, f23 = 500MHz, f23 = 600MHz, f23 = 700MHz, or f23 = 1000MHz.

[0152] Figure 5b The other structures of the mobile terminal shown can be referenced. Figure 5aThe settings for the mobile terminal shown are described below and will not be elaborated upon here.

[0153] In one embodiment, when the mobile terminal is in a flattened state, and the first radiator 6 is disposed in the first housing 1, the second radiator 7 is disposed in the second housing 2, and the third radiator 8 is disposed in the third housing 3, if the satellite antenna is in an operational state, the resonant frequency of the first frequency and the resonant point frequency of the third resonance can be made to be within the first communication frequency band of the satellite antenna, while the second frequency is higher than the first communication frequency band. This allows for adjustment of the maximum radiation direction of the satellite antenna's radiation pattern while simultaneously increasing the circular polarization gain of the satellite antenna.

[0154] In one embodiment, when the mobile terminal is in a flattened state, and the first radiator 6 is disposed in the first housing 1, the second radiator 7 is disposed in the second housing 2, and the third radiator 8 is disposed in the third housing 3, if the satellite antenna is in an operational state, the frequency difference f13 between the first frequency f1 and the resonant frequency f3 of the third resonance satisfies: f13 ≤ 10% * f3, so that the current of the third radiator 8 can be suppressed through the coupling between the first radiator 6 and the third radiator 8, thereby adjusting the maximum radiation direction of the radiation pattern. The frequency difference f23 between the second frequency f2 and the resonant frequency f3 of the third resonance satisfies: f23 > 10% * f3. For example, f23 ≥ 20% * f3 can be made so that the ground current and the current between the second radiator 7 and the third radiator 8 can generate an orthogonally polarized radiation field through the coupling between the second radiator 7 and the third radiator 8, thereby enhancing the circular polarization gain of the satellite antenna.

[0155] In one embodiment, the frequency difference f13 between the first frequency f1 and the third frequency f3 satisfies: 0 ≤ f13 ≤ 100MHz. For example, f13 = 50MHz, f13 = 65MHz, or f13 = 90MHz, etc. Additionally, the frequency difference f23 between the second frequency f2 and the third frequency f3 satisfies: f23 > 100MHz. For example, f23 ≥ 300MHz, such as f23 = 350MHz, f23 = 500MHz, f23 = 600MHz, f23 = 700MHz, or f23 = 1000MHz, etc.

[0156] Figure 6a This is a schematic diagram of the antenna system distribution structure for a mobile terminal in a hovering state, as provided in an embodiment of this application. Figure 6a As shown, the first housing 1 includes a first support surface 101 for supporting the flexible display screen, the second housing 2 includes a second support surface 201 for supporting the flexible display screen, and the third housing 3 includes a third support surface 301 for supporting the flexible display screen. In this hovering state, the first support surface 101 and the second support surface 201 are coplanar, and the third support surface 301 intersects with the second support surface 201.

[0157] It is worth mentioning that, in the present application, the first support surface 101 and the second support surface 201 are coplanar, which can be understood as the included angle between the first support surface 101 and the second support surface 201 being 175°-185°. In actual application, the included angle between the first support surface 101 and the second support surface 201 can be 180°. In addition, the intersection of the third support surface 301 and the second support surface 201 can be that the included angle a between the third support surface 301 and the second support surface 201 satisfies: 45°≤a≤135°, for example, 60°≤a≤120° or 80°≤a≤100°, and in actual application, a can be 90°.

[0158] In Figure 6a In the embodiment shown, the first radiator 6 is arranged on the first housing 1, the third radiator 8 is arranged on the second housing 2, and the second radiator 7 is arranged on the third housing 3. Among them, the first radiator 6 is coupled to the floor through the other branch of the first tuning circuit to form a fourth resonant structure, the fourth resonant structure corresponds to a fourth frequency, the second radiator 7 is coupled to the floor through the other branch of the second tuning circuit to form a fifth resonant structure, the fifth resonant structure corresponds to a fifth frequency, and the third radiator 8 is used to generate a sixth resonance. The resonance point frequencies of the fifth frequency and the sixth resonance are within the second communication frequency band of the satellite antenna, and the fourth frequency is higher than the second communication frequency band.

[0159] Due to the fact that Figure 6a In the state shown, the floor size of the mobile terminal is large, and the current on the floor is vertically distributed, so that circular polarization can be achieved, which is beneficial to the improvement of the performance of the satellite antenna.

[0160] It is worth mentioning that the present application does not limit the second communication frequency band of the satellite antenna, which can be exemplified as the working frequency band of the satellite antenna in the receiving state when the mobile terminal is in the hovering state; or it can also be the working frequency band of the satellite antenna in the transmitting state. In addition, it can be understood that when the satellite antenna communicates with different communication satellites, the working frequency band of the satellite antenna in the receiving state can be different, and the working frequency band of the satellite antenna in the transmitting state can also be different. However, the antenna system provided by the present application can adjust the fourth frequency, the fifth frequency and the resonance point frequency of the resonance of the third radiator 8 according to different application scenarios when the mobile terminal is in the hovering state, so as to satisfy the above relationship, so that the pattern of the satellite antenna is optimized under the joint action of the first radiator and the first tuning circuit, the second radiator and the second tuning circuit, and the third radiator, and / or the gain of the satellite antenna is improved, so as to improve the satellite communication performance of the mobile terminal.

[0161] In an embodiment of the present application, the frequency difference f46 between the fourth frequency f4 and the resonant point frequency f6 of the sixth resonance can satisfy: f46>10%*f6, and exemplarily, f46≥20%*f6, so as to make the floor current and the current between the first radiator 6 and the third radiator 8 produce a quadrature polarized radiation field through the coupling between the first radiator 6 and the third radiator 8, thereby enhancing the circular polarization gain of the satellite antenna. In a specific embodiment, the frequency difference f46 between the fourth frequency f4 and the resonant point frequency f6 of the sixth resonance can satisfy: f46>100MHz, and exemplarily, f46≥300MHz, such as f46=350MHz, f46=500MHz, f46=600MHz, f46=700MHz or f46=1000MHz, etc.

[0162] In an embodiment of the present application, the frequency difference f56 between the fifth frequency f5 and the resonant point frequency f6 of the sixth resonance can satisfy: f56≤10%*f3, so as to play a restraining role on the current of the third radiator 8 through the coupling between the second radiator 7 and the third radiator 8, thereby adjusting the maximum radiation direction of the directional diagram. In a specific embodiment, the frequency difference f56 between the resonant point frequency f5 of the fifth resonance and the resonant point frequency f6 of the sixth resonance can satisfy: 0≤f56≤100MHz, and exemplarily, f56=50MHz, f56=65MHz or f56=90MHz, etc.

[0163] It is worth mentioning that when the mobile terminal is in the hovering state as shown in Figure 6a , the resonant point frequency of the sixth resonance can also be within the second communication frequency band of the satellite antenna, the fourth frequency is higher than the second communication frequency band, and the fifth frequency is higher than the second communication frequency band. Since the floor size of the mobile terminal is large, and the current of the satellite antenna can be vertically distributed on the floor to achieve circular polarization, it is beneficial to the improvement of the performance of the satellite antenna.

[0164] It can be understood that in actual application, the setting positions of the three radiators can be adjusted according to specific design requirements. Exemplarily, as shown in Figure 6b , the first radiator 6 is arranged on the first shell 1, the second radiator 7 is arranged on the second shell 2, and the third radiator 8 is arranged on the third shell 3. Figure 6b is another distribution structure diagram of the antenna system when the mobile terminal is in the hovering state provided by an embodiment of the present application. Different from the setting positions of the radiators in the mobile terminal shown in Figure 6a , in Figure 6b , the first radiator 6 is arranged on the first shell 1, the second radiator 7 is arranged on the second shell 2, and the third radiator 8 is arranged on the third shell 3. Among them, the resonant point frequency of the sixth resonance generated by the fifth frequency and the third radiator 8 is within the second communication frequency band of the satellite antenna, but the fourth frequency is higher than the second communication frequency band. When the mobile terminal is in the hovering state as shown in Figure 6bIn the illustrated hovering state, due to the large floor size and the vertical distribution of the current of the satellite antenna on the floor, the circular polarization is achieved, thus the performance of the satellite antenna is improved.

[0165] In addition, when the mobile terminal is in Figure 6b In the illustrated state, in one possible embodiment, the frequency difference f46 between the fourth frequency f4 and the resonance point frequency f6 of the sixth resonance can satisfy: f46>10%*f6, and exemplarily, f46≥20%*f6, so as to make the floor current and the current between the first radiator 6 and the third radiator 8 produce orthogonal polarization radiation field through the coupling between the first radiator 6 and the third radiator 8, thus the circular polarization gain of the satellite antenna is enhanced. In one specific embodiment, the frequency difference f46 between the resonance point frequency f4 of the fourth resonance and the resonance point frequency f6 of the sixth resonance satisfies: f46>100MHz, and exemplarily, f46≥300MHz, such as f46=350MHz, f46=500MHz, f46=600MHz, f46=700MHz or f46=1000MHz, etc.

[0166] The frequency difference f56 between the fifth frequency f5 and the resonance point frequency f6 of the sixth resonance satisfies: f56≤10%*f6, so as to play a restraining role on the current of the third radiator 8 through the coupling between the second radiator 7 and the third radiator 8, thus the maximum radiation direction of the radiation pattern is adjusted. In one specific embodiment, the frequency difference f56 between the fifth frequency f5 and the sixth frequency f6 satisfies: 0≤f56≤100MHz, and exemplarily, f56=50MHz, f56=65MHz or f56=90MHz, etc.

[0167] Figure 6b The other structures of the illustrated mobile terminal can refer to Figure 6a The mobile terminal illustrated in the illustrated state is set, and details are not described herein.

[0168] It is worth mentioning that, when the mobile terminal is in Figure 6b In the illustrated hovering state, and the first radiator 6 is arranged in the first shell 1, the second radiator 7 is arranged in the second shell 2, and the third radiator 8 is arranged in the third shell 3, if the satellite antenna is in the working state, the resonance point frequency of the first frequency, the second frequency and the third resonance can be in the first communication frequency band of the satellite antenna. In this way, the current of the satellite antenna on the floor can still be vertically distributed, thus the circular polarization is achieved, thus the performance of the satellite antenna is improved, and at the same time, the adjustment on the maximum radiation direction of the radiation pattern is also achieved.

[0169] In one embodiment of the present application, when the mobile terminal is in Figure 6bIn the illustrated hovering state, and when the first radiator 6 is arranged in the first housing 1, the second radiator 7 is arranged in the second housing 2, and the third radiator 8 is arranged in the third housing 3, if the satellite antenna is in the working state, the frequency difference f46 between the fourth frequency f4 and the resonant point frequency f6 of the sixth resonance can satisfy: f46≤10%*f6. In addition, the frequency difference f56 between the fifth frequency f5 and the resonant point frequency f6 of the sixth resonance can satisfy: f56≤10%*f6. In this way, the adjustment of the maximum radiation direction of the radiation pattern can be realized while realizing circular polarization and improving the performance of the satellite antenna.

[0170] In another embodiment of the present application, the frequency difference f46 between the fourth frequency f4 and the resonant point frequency f6 of the sixth resonance can satisfy: 0≤f46≤100MHz, and examples include f46=50MHz, f46=65MHz, or f46=90MHz, etc. In addition, the frequency difference f56 between the fifth frequency f5 and the resonant point frequency f6 of the sixth resonance can satisfy: 0≤f56≤100MHz, and examples include f56=50MHz, f56=65MHz, or f56=90MHz, etc.

[0171] It is worth mentioning that, in the embodiments illustrated in Figure 6a and Figure 6b In the illustrated embodiments, the third housing 3 is folded along the side of the second support surface 201 away from the flexible display screen, so that the flexible display screen can be displayed by the part of the flexible display screen located on the first support surface 101 and the second support surface 201, and the display surface is larger, which can provide better user experience.

[0172] In some other possible embodiments of the present application, the third housing 3 can also be folded along the side of the second support surface 201 facing the flexible display screen, so that the mobile terminal can provide a larger display surface, and the third housing 3 can also provide a certain use privacy for the user.

[0173] In summary, for the multi-fold mobile terminal, no matter whether the third radiator 8 is arranged on the middle one of the shells or the side one of the shells, in the fully unfolded state of the mobile terminal, the first resonant structure can be arranged on at least one shell adjacent to the shell where the third radiator 8 is arranged, and the frequency corresponding to the first resonant structure is higher than the operating frequency band of the third radiator 8 (for example, the frequency difference between the frequency corresponding to the first resonant structure and the resonant point frequency of the third radiator 8 is greater than 10%), so as to enhance the circular polarization gain of the satellite antenna; and other shells on the multi-fold shells can also be provided with the second resonant structure, the third resonant structure, etc., wherein the frequency corresponding to any resonant structure in the second resonant structure, the third resonant structure, etc. can be higher than the above-mentioned operating frequency band, so as to further enhance the circular polarization gain; or the frequency corresponding to any resonant structure in the second resonant structure, the third resonant structure, etc. can also fall within the above-mentioned operating frequency band, or the frequency difference between the frequency corresponding to the any resonant structure and the resonant point frequency of the third radiator 8 is less than or equal to 10%, so as to improve the directivity diagram of the satellite antenna.

[0174] In the hovering state of the mobile terminal, the third radiator 8 is arranged on one shell in intersecting relationship (for example, in L shape), and the frequency corresponding to the resonant structure on the other shell in intersecting relationship falls within the operating frequency band of the third radiator 8 (or the frequency difference between the resonant point frequency of the third radiator 8 is less than or equal to 10%), based on the design in the hovering state, the circular polarization gain of the satellite antenna can be enhanced, and the directivity diagram can also be improved; and any one of the frequencies corresponding to the resonant structures on other shells on the multi-fold shells can be higher than the operating frequency band of the third radiator 8, so as to further enhance the circular polarization gain of the satellite antenna, or can also fall within the operating frequency band of the third radiator 8 (or the frequency difference between the resonant point frequency of the third radiator 8 is less than or equal to 10%), so as to improve the directivity diagram.

[0175] Figure 7a A distribution structure diagram of an antenna system of a mobile terminal in a folded state is provided for the embodiments of the present application. As shown in Figure 7a The first shell 1 includes a first support surface 101 for supporting a flexible display screen, the second shell 2 includes a second support surface 201 for supporting the flexible display screen, and the third shell 3 includes a third support surface 301 for supporting the flexible display screen. In the state shown in Figure 7a The first support surface 101 and the second support surface 201 are coplanar, and the third support surface 301 is opposite to the second support surface 201, that is, the third shell 3 is folded to the side of the second shell 2 away from the flexible display screen.

[0176] In the state shown in Figure 7aIn the shown embodiment, the third radiator 8 is arranged on the second housing 2, the first radiator 6 is arranged on the first housing 1, and the second radiator 7 is arranged on the third housing 3. When the satellite antenna is in the working state, the first radiator 6 is coupled to the floor through the other branch of the first tuning circuit to form a seventh resonant structure, the seventh resonant structure corresponds to a seventh frequency, the second radiator 7 is coupled to the floor through the other branch of the second tuning circuit to form an eighth resonant structure, the eighth resonant structure corresponds to an eighth frequency, and the third radiator 8 is used to generate a ninth resonance, the resonance point frequency of the ninth resonance is within the third communication frequency band of the satellite antenna, the seventh frequency is higher than the third communication frequency band, and the eighth frequency is higher than the third communication frequency band.

[0177] It is worth mentioning that the third communication frequency band of the satellite antenna is not limited in the present application, which can be, for example, the frequency band in which the mobile terminal communicates with the communication satellite. Figure 7a When the satellite antenna is in the working state, the satellite antenna is in the receiving state; or the satellite antenna can also be in the working state of the transmitting state. In addition, it can be understood that when the satellite antenna communicates with different communication satellites, the working frequency band of the receiving state of the satellite antenna can be different, and the working frequency band of the transmitting state of the satellite antenna can also be different. However, the antenna system provided by the present application can adjust the seventh frequency, the eighth frequency, and the resonance point frequency of the resonance of the third radiator 8 when the mobile terminal is in the folding state according to different application scenarios, so as to satisfy the above relationship, so that the directional diagram of the satellite antenna is optimized under the joint action of the first radiator and the first tuning circuit, the second radiator and the second tuning circuit, and the third radiator, and / or the gain of the satellite antenna is improved, so as to improve the satellite communication performance of the mobile terminal. Figure 7a

[0178] Referring to Figure 7b , Figure 7b for Figure 7a the local structure of B in the structure shown in the enlarged view. When the mobile terminal is in the folding state, the second radiator 7 can act as a parasitic radiator of the third radiator 8. As shown in Figure 7b , the current distribution of the second radiator 7 is similar to that of the third radiator 8, which can effectively reduce the decrease of the radiation efficiency of the satellite antenna caused by the folding of the third housing 3, so that the satellite antenna can still meet certain communication requirements. In addition, when the mobile terminal is in the folding state shown in Figure 7a , the size of the floor is slightly larger, so the satellite antenna also has the characteristics of a part of the traveling wave antenna.

[0179] In addition, when the mobile terminal is in Figure 7a ​In the state shown, in one possible embodiment, the frequency difference f79 between the seventh frequency f7 and the resonant point frequency f9 of the ninth resonance satisfies: f79>10%*f9, and exemplarily, f79 can be made to satisfy: f79≥10%*f9, so as to make the floor current and the current between the first radiator 6 and the third radiator 8 produce an orthogonally polarized radiation field through the coupling between the first radiator 6 and the third radiator 8, which is beneficial to improving the circular polarization gain of the satellite antenna. In one specific embodiment, the frequency difference f79 between the seventh frequency f7 and the resonant point frequency f9 of the ninth resonance satisfies: f79>100MHz, and exemplarily, f79 can be made to satisfy: f79≥300MHz, for example, f79=350MHz, f79=500MHz, f79=600MHz, f79=700MHz, or f79=1000MHz, etc.

[0180] The frequency difference f89 between the eighth frequency f8 and the ninth frequency f9 satisfies: f89>10%*f9, and exemplarily, f89 can be made to satisfy: f89≥10%*f9, so as to make the floor current and the current between the second radiator 7 and the third radiator 8 produce an orthogonally polarized radiation field through the coupling between the second radiator 7 and the third radiator 8, which is beneficial to improving the circular polarization gain of the satellite antenna. In one specific embodiment, the frequency difference f89 between the resonant point frequency f8 of the eighth resonance and the resonant point frequency f9 of the ninth resonance satisfies: f89>100MHz, and exemplarily, f89 can be made to satisfy: f89≥300MHz, for example, f89=350MHz, f89=500MHz, f89=600MHz, f89=700MHz, or f89=1000MHz, etc.

[0181] Figure 7c Another distribution structure of the antenna system of the mobile terminal in a folded state is provided in the embodiments of the present application. Different from the above-mentioned Figure 7a The setting positions of the various radiators in the mobile terminal shown are different from those in the above-mentioned Figure 7b In the mobile terminal shown, the first radiator 6 is arranged on the first casing 1, the second radiator 7 is arranged on the second casing 2, and the third radiator 8 is arranged on the third casing 3. If the satellite antenna is in a working state, the resonant point frequency of the ninth resonance that can be produced by the third radiator 8 is in the third communication frequency band of the satellite antenna, the seventh frequency is higher than the third communication frequency band, and the eighth frequency is higher than the third communication frequency band. The antenna system of the mobile terminal still can reduce the decrease of the radiation efficiency of the satellite antenna caused by the folding of the third casing 3 by making the current distribution of the second radiator 7 similar to the current distribution of the third radiator 8, so that the satellite antenna can still meet certain communication requirements.

[0182] In the above embodiments of the present application, when the mobile terminal is in each folding state, the frequency corresponding to the first resonant structure and the frequency corresponding to the second resonant structure are both changed with the resonant point frequency of the third radiator 8, and the frequency corresponding to the first resonant structure is controlled by the branch of the first tuning circuit to which the first radiator 6 is connected, and the frequency corresponding to the second resonant structure is controlled by the branch of the second tuning circuit to which the second radiator 7 is connected.

[0183] Based on this, in a possible embodiment of the present application, the mobile terminal has at least two folding states, such as the flat state, the hovering state and the folded state mentioned above. For any two folding states, when the satellite antenna is in the working state, the first radiator 6 can be connected to different branches of the first tuning circuit, and the second radiator 7 can be connected to different branches of the second tuning circuit. For example, when the mobile terminal is in the flat state, the first radiator 6 is connected to the first branch of the first tuning circuit, and the second radiator 7 is connected to the first branch of the second tuning circuit; when the mobile terminal is in the hovering state, the first radiator 6 is connected to the second branch of the first tuning circuit, and the second radiator 7 is connected to the second branch of the second tuning circuit; and when the mobile terminal is in the folded state, the first radiator 6 is connected to the third branch of the first tuning circuit, and the second radiator 7 is connected to the third branch of the second tuning circuit. In this way, the frequencies corresponding to the two resonant structures can meet the use requirements of the mobile terminal in different folding states, so that the two resonant structures can affect the resonant mode of the resonance generated by the third radiator 8, so as to optimize the directivity of the satellite antenna, thereby improving the communication performance of the satellite antenna.

[0184] In addition, it can be understood that when the mobile terminal is in the same folding state but the positions of the three radiators are different, the first radiator 6 can also be connected to different branches of the first tuning circuit, and the second radiator 7 can also be connected to different branches of the second tuning circuit, so that the frequencies corresponding to the two resonant structures meet the relationship with the resonant point frequency of the resonance generated by the third radiator 8, thereby improving the radiation efficiency of the satellite antenna.

[0185] In another possible embodiment of the present application, when the mobile terminal is in different folding states, the first radiator 6 can also be connected to the same branch of the first tuning circuit. For example, the first radiator 6 can be connected to a branch for making the resonant point frequency f of the first radiator 6 meet 2500MHz≤f≤2700MHz, so that the first radiator 6 works in the above fixed working frequency band when the mobile terminal is in various folding states. In this way, the satellite communication requirements of the mobile terminal in different folding states can be met, and the antenna system can also be simplified.

[0186] It is also considered that the satellite antenna communicates with the communication satellite, that is, the satellite antenna receives and transmits electromagnetic waves. In actual application, the frequency of the electromagnetic wave received by the satellite antenna is different from the frequency of the electromagnetic wave transmitted by the satellite antenna. In a possible embodiment of the present application, when the satellite antenna is in the transmitting state, the first radiator 6 can be connected to the first branch of the first tuning circuit. When the satellite antenna is in the receiving state, the first radiator 6 can be connected to the second branch of the first tuning circuit. Thus, when the satellite antenna is in the transmitting state and the receiving state, the corresponding branch of the first tuning circuit can be used to adjust the corresponding frequency of the first resonant structure, so as to meet the communication requirements of the satellite antenna and improve the intelligence of the antenna system.

[0187] In another possible embodiment of the present application, when the satellite antenna is in the transmitting state or the receiving state, the first radiator 6 can also be connected to the same branch of the first tuning circuit. That is, the first resonant structure corresponds to the same frequency, for example, the frequency in the frequency band of 2500MHz-2700MHz, whether the satellite antenna is in the transmitting state or the receiving state. In this way, the satellite communication requirements of the mobile terminal can be met, and the antenna system can be simplified.

[0188] As introduced above, the first radiator 6 can always be connected to the same branch of the first tuning circuit. In this way, the satellite communication requirements of the antenna system can be met, and the cellular communication requirements of the antenna system can also be met, so as to improve the utilization rate of the branch of the first tuning circuit.

[0189] In a possible embodiment of the present application, when the satellite antenna is in the non-working state, the first radiator 6 is coupled to the first antenna radio frequency link and is used to generate a first resonance, and the resonance point frequency of the first resonance is in the communication frequency band of the first antenna. In actual application, the first antenna radio frequency link can be a cellular radio frequency link, and when the satellite antenna is in the non-working state, the first radiator 6 is used as a radiator of the cellular antenna for cellular communication.

[0190] It is worth mentioning that when the satellite antenna is in the working state, the first radiator 6 can form a resonant structure with the first tuning circuit to affect the pattern of the satellite antenna. In a possible embodiment, when the satellite antenna is in the working state, the frequency corresponding to the first resonant structure can be the same as the resonance point frequency of the first resonance generated by the first radiator 6 when the satellite antenna is in the non-working state, so as to realize the reuse of the cellular antenna and simplify the antenna system.

[0191] In practical application, since the working state of the cellular antenna includes the B41 state, when the satellite antenna is in the non-working state, the first radiator 6 can be connected to a branch of the first tuning circuit, so that the first radiator 6 can generate a first resonance in the frequency band corresponding to the B41 state through the branch of the first tuning circuit. When the satellite antenna is in the working state, the first radiator 6 can still be connected to the branch of the first tuning circuit, so that the frequency corresponding to the first resonance structure falls within the frequency band corresponding to the B41 state.

[0192] It can be understood that the first radiator 6 can also be used for other antennas and can generate a target resonance corresponding to the target frequency of the other antennas. When the first radiator 6 is used as the first resonance structure, as long as the target resonance satisfies the description of the first resonance structure in the above embodiments of the present application.

[0193] In addition, in the present application, when the mobile terminal is in the closed state and the satellite antenna is not working, the resonance point frequency of the third radiator 8 can be greater than the resonance point frequency of the resonance generated by the first radiator 6, and the resonance point frequency of the resonance generated by the second radiator 7 can be greater than the resonance point frequency of the first radiator 6. That is, when the mobile terminal is in the closed state and the satellite antenna is not working, the second radiator 7 and the third radiator 8 can both act as parasitic radiators of the first radiator 6, thereby improving the cellular communication performance of the antenna system.

[0194] It can be understood that in the present application, the mobile terminal can also control the state of the first tuning circuit through the cellular radio frequency link, so that the first radiator 6 generates a corresponding resonance. In addition, the mobile terminal can control the state of the second tuning circuit through the cellular radio frequency link or the satellite link, so that the second radiator 7 generates a corresponding resonance.

[0195] As can be known from the foregoing, different branches of the first tuning circuit can be understood as different conduction states of the first tuning circuit, and each conduction state can be considered as a branch of the first tuning circuit. In the present application, a switch assembly can be used to switch between different branches of the first tuning circuit. Similarly, a switch assembly can also be used to switch between different branches of the second tuning circuit. In the specific design, reference can be made to the above description of the first tuning circuit. Figure 8 , Figure 8 Another structure of the antenna system when the mobile terminal is in the unfolded state is provided in the present application. In this embodiment, the first radiator 6 is arranged in the first housing 1, the third radiator 8 is arranged in the second housing 2, and the second radiator 7 is arranged in the third housing 3. In addition, the first tuning circuit further includes a first switch assembly 10, and the second tuning circuit further includes a second switch assembly 11. The first switch assembly includes a first switch device SW1 and a second switch device SW2, and the second switch assembly includes a third switch device SW3 and a fourth switch device SW4.

[0196] In addition, since the resonance point frequency of the resonance generated by the third radiator 8 is different when the mobile terminal is in different folding states, in order to make the resonance point frequency of the third radiator 8 adjustable according to the communication requirements in different folding states, the satellite antenna further comprises a third switch assembly 12 coupled with the third radiator 8. In addition, as shown in Figure 8 The third switch assembly 12 comprises a fifth switch device SW5 and a sixth switch device SW6.

[0197] In the embodiment of the present application, the mobile terminal can but is not limited to control the on and off of the third switch assembly 12 through the cellular radio frequency link. In addition, when the third switch assembly 12 is in the on state, the satellite radio frequency link can control the on state of the third switch assembly 12 through the first feeding point to realize the switching of the receiving state and the transmitting state of the satellite antenna. For example, when the third switch assembly 12 is in the first on state, the satellite antenna is in the receiving state; and when the third switch assembly 12 is in the second on state, the satellite antenna is in the transmitting state.

[0198] It can be understood that in actual application, the switching state of the switch device in each switch assembly can be adjusted to connect each radiator to different circuit branches, so as to make each radiator generate corresponding resonance.

[0199] It is worth mentioning that, as shown in Figure 8 In the embodiment of the present application, the switch device with an inductor in parallel with the ground plate in each switch assembly can be used to increase the resonance point frequency of the radiator, and the switch device with a cross-gap capacitor can be used to decrease the resonance point frequency of the radiator. In other embodiments of the present application, each switch assembly can also adopt other possible design forms to realize the function of adjusting the resonance frequency of the radiator, which will not be listed one by one, but should be understood as falling within the protection scope of the present application.

[0200] In addition, in the above-mentioned switch devices, the cross-gap capacitor, such as the first capacitor C1 in the third switch device S3 and the second capacitor C2 in the fifth switch device S5, can also play the role of increasing the radiation aperture to improve the gain of the satellite antenna, thereby increasing the width of the beam width of the directional diagram.

[0201] In a specific embodiment, in Figure 8In the flat state shown, when the first switch device SW1 is in the first state, the second switch device SW2 is in the first state, the third switch device SW3 is in the first state, the fourth switch device SW4 is in the first state, the fifth switch device SW5 is in the first state, and the sixth switch device SW6 is in the first state, the satellite antenna is in the transmitting state. At this time, the resonant point frequency generated by the third radiator 8 is in a communication frequency band in the transmitting state of the satellite antenna, the frequency corresponding to the first resonant structure is modulated to the working frequency band of 2500MHz-2700MHz through the first switch assembly 10, and the frequency corresponding to the second resonant structure is modulated to a position higher than the above communication frequency band through the second switch assembly 11.

[0202] Figure 9 For the embodiments of the present application Figure 8 The diagram of the directional pattern of the satellite antenna of the mobile terminal in the transmitting state is shown. By Figure 9 It can be seen that, by using the design scheme of the antenna system provided by the present application, the beam angle α of the directional pattern of the satellite antenna of the mobile terminal can reach more than 15°, that is, the beam width of the directional pattern can reach more than ±15°, for example, can reach ±20°, or even ±30°, which can meet the satellite communication requirements of the mobile terminal in the flat state.

[0203] Continuing to refer to Figure 8 When the first switch device SW1 is in the second state, the second switch device SW2 is in the second state, the third switch device SW3 is in the second state, the fourth switch device SW4 is in the second state, the fifth switch device SW5 is in the second state, and the sixth switch device SW6 is in the second state, the satellite antenna is in the receiving state. At this time, the resonant point frequency generated by the third radiator 8 is in a communication frequency band in the receiving state of the satellite antenna, the frequency corresponding to the first resonant structure is modulated to the working frequency band of 2500MHz-2700MHz through the first switch assembly 10, and the frequency corresponding to the second resonant structure is modulated to a position higher than the above communication frequency band through the second switch assembly 11.

[0204] In addition, it has been verified that when the satellite antenna is in the receiving state, the beam angle α of the directional pattern can also reach more than 15°, which can still meet the satellite communication requirements of the mobile terminal in the flat state.

[0205] In addition, when the mobile terminal is in the flat state as Figure 6aThe satellite antenna is in a transmitting state when, as shown, the first radiator 6 is disposed in the first housing 1, the third radiator 8 is disposed in the second housing 2, and the second radiator 7 is disposed in the third housing 3. When the first switching device SW1, the second switching device SW2, the third switching device SW3, the fourth switching device SW4, the fifth switching device SW5, and the sixth switching device SW6 are all in the third state, the satellite antenna is in a transmitting state. At this time, the resonant frequency generated by the third radiator 8 is within a communication frequency band when the satellite antenna is in the transmitting state. The first switching assembly 10 modulates the frequency corresponding to the first resonant structure to the 2500MHz–2700MHz operating frequency band, and the second switching assembly 11 modulates the frequency corresponding to the second resonant structure to a position higher than the aforementioned communication frequency band.

[0206] Figure 10 Provided for the embodiments of this application Figure 6a This is a schematic diagram of the radiation pattern of the satellite antenna of the mobile terminal when it is in transmit mode. Figure 10 It can be seen that, by adopting the antenna system design scheme provided in this application, when the mobile terminal is in a hovering state, the beam angle α of the satellite antenna pattern can reach more than 15°, that is, the beam width of the pattern can reach more than ±15°, for example, ±20°, or even ±30°, which can meet the satellite communication requirements of the mobile terminal in a hovering state.

[0207] Furthermore, when the first switching device SW1, the second switching device SW2, the third switching device SW3, the fourth switching device SW4, the fifth switching device SW5, and the sixth switching device SW6 are all in the fourth state, the satellite antenna is in the receiving state. At this time, the resonant frequency generated by the third radiator 8 is within a communication frequency band when the satellite antenna is in the receiving state. The first switching assembly 10 modulates the frequency corresponding to the first resonant structure to the 2500MHz–2700MHz operating frequency band, and the second switching assembly 11 modulates the frequency corresponding to the second resonant structure to the aforementioned communication frequency band.

[0208] It has been verified that when the mobile terminal is in a hovering state and the satellite antenna is in a receiving state, the beam angle α of its radiation pattern can reach more than 15°, which can meet the satellite communication requirements of the mobile terminal in a hovering state.

[0209] For example, in mobile terminals, such as Figure 7aThe satellite antenna is in the transmitting state when the first switch device SW1 is in the fifth state, the second switch device SW2 is in the fifth state, the third switch device SW3 is in the fifth state, the fourth switch device SW4 is in the fifth state, the fifth switch device SW5 is in the fifth state, and the sixth switch device SW6 is in the fifth state. At this time, the resonant point frequency generated by the third radiator 8 is in a communication frequency band when the satellite antenna is in the transmitting state, the frequency corresponding to the first resonant structure is modulated to the working frequency band of 2500-2700 MHz through the first switch assembly 10, and the frequency corresponding to the second resonant structure is modulated to the above-mentioned communication frequency band through the second switch assembly 11.

[0210] Figure 11 The satellite antenna of the mobile terminal shown in the transmitting state is in the transmitting state. Figure 7a The satellite antenna of the mobile terminal shown in the transmitting state is in the transmitting state. Figure 11 It can be seen that, by adopting the design scheme of the antenna system provided in the present application, when the mobile terminal is in the folded state, the beam angle α of the directional diagram of the satellite antenna can also meet the regulatory requirements, and the beam width thereof can reach ±15°, for example, which can meet the satellite communication requirements of the mobile terminal in the hovering state.

[0211] In addition, the satellite antenna is in the receiving state when the first switch device SW1 is in the sixth state, the second switch device SW2 is in the sixth state, the third switch device SW3 is in the sixth state, the fourth switch device SW4 is in the sixth state, the fifth switch device SW5 is in the sixth state, and the sixth switch device SW6 is in the sixth state. At this time, the resonant point frequency generated by the third radiator 8 is in a communication frequency band when the satellite antenna is in the receiving state, the frequency corresponding to the first resonant structure is modulated to the working frequency band of 2500-2700 MHz through the first switch assembly 10, and the frequency corresponding to the second resonant structure is modulated to the above-mentioned communication frequency band through the second switch assembly 11.

[0212] It has been verified that, when the mobile terminal is in the folded state and the satellite antenna is in the receiving state, the beam angle α of the directional diagram thereof can also reach 15°, which can meet the satellite communication requirements of the mobile terminal in the folded state.

[0213] In summary, the antenna system of the mobile terminal provided in this application embodiment can adjust the frequency corresponding to the first resonant structure formed by the first tuning circuit and the first radiator, and the frequency corresponding to the second resonant structure formed by the second tuning circuit and the second radiator, according to the folded state of the mobile terminal, the setting position of each radiator, and the working state of the satellite antenna. This allows the first and second resonant structures to influence the resonant mode of the third radiator, enabling the satellite antenna to generate a target radiation pattern. This is beneficial for optimizing the radiation pattern of the satellite antenna, thereby improving the radiation efficiency of the satellite antenna.

[0214] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A mobile terminal, characterized in that, The system includes a first housing (1), a second housing (2), a third housing (3), a first rotating shaft mechanism (4), a second rotating shaft mechanism (5), and an antenna system. The first housing (1) and the second housing (2) are rotatably connected via the first rotating shaft mechanism (4), and the second housing (2) and the third housing (3) are rotatably connected via the second rotating shaft mechanism (5). The antenna system includes a satellite antenna, which includes a satellite radio frequency link, a first radiator (6), a second radiator (7), a third radiator (8), a first tuning circuit, and a second tuning circuit. The first radiator (6) is coupled to the first tuning circuit; the second radiator (7) is coupled to the second tuning circuit; and the third radiator (8) is coupled to the satellite radio frequency link. The first radiator (6), the second radiator (7), and the third radiator (8) are respectively disposed in different housings. Along the axial direction of the mobile terminal, the first radiator (6), the second radiator (7), and the third radiator (8) are located at one end of the mobile terminal. When the satellite antenna is in operation, the first radiator (6) and the first tuning circuit, the second radiator (7) and the second tuning circuit, and the third radiator (8) are used to jointly generate the target radiation pattern of the satellite antenna.

2. The mobile terminal as described in claim 1, characterized in that, When the mobile terminal is in a flattened state and the third radiator (8) is disposed on the second housing (2), the satellite antenna is in a working state. The first radiator (6) is coupled to the ground through a branch of the first tuning circuit to form a first resonant structure, and the first resonant structure corresponds to a first frequency. The second radiator (7) is coupled to the ground through a branch of the second tuning circuit to form a second resonant structure, the second resonant structure corresponding to a second frequency; the third radiator (8) is used to generate a third resonance, wherein the first frequency and the resonant point frequency of the third resonance are within the first communication frequency band of the satellite antenna; the second frequency is higher than the first communication frequency band.

3. The mobile terminal as described in claim 1, characterized in that, When the mobile terminal is in a flattened state and the third radiator (8) is disposed on the second housing (2), the satellite antenna is in a working state. The first radiator (6) is coupled to the ground through a branch of the first tuning circuit to form a first resonant structure, and the first resonant structure corresponds to a first frequency. The second radiator (7) is coupled to the ground through a branch of the second tuning circuit to form a second resonant structure, which corresponds to a second frequency; the third radiator (8) is used to generate a third resonance, wherein the frequency difference f13 between the first frequency f1 and the resonant point frequency f3 of the third resonance satisfies: f13≤10%*f3, and the frequency difference f23 between the second frequency f2 and the resonant point frequency f3 of the third resonance satisfies: f23>10%*f3.

4. The mobile terminal as described in claim 3, characterized in that, The frequency difference f13 between the first frequency f1 and the resonant frequency f3 of the third resonance satisfies: 0 ≤ f13 ≤ 100MHz; the frequency difference f23 between the second frequency f2 and the resonant frequency f3 of the third resonance satisfies: f23 > 100MHz.

5. The mobile terminal as described in claim 1, characterized in that, When the mobile terminal is in a flattened state and the third radiator (8) is disposed on the second housing (2), the satellite antenna is in a working state. The first radiator (6) is coupled to the ground through a branch of the first tuning circuit to form a first resonant structure, and the first resonant structure corresponds to a first frequency. The second radiator (7) is coupled to the ground through a branch of the second tuning circuit to form a second resonant structure, the second resonant structure corresponding to a second frequency; the third radiator (8) is used to generate a third resonance, wherein the resonant frequency of the third resonance is within the first communication frequency band of the satellite antenna; the first frequency is higher than the first communication frequency band, and the second frequency is higher than the first communication frequency band.

6. The mobile terminal as described in claim 5, characterized in that, When the mobile terminal is in a flattened state and the third radiator (8) is disposed on the second housing (2), the satellite antenna is in a working state. The first radiator (6) is coupled to the ground through a branch of the first tuning circuit to form a first resonant structure, and the first resonant structure corresponds to a first frequency. The second radiator (7) is coupled to the ground through a branch of the second tuning circuit to form a second resonant structure, which corresponds to a second frequency; the third radiator (8) is used to generate a third resonance, wherein the frequency difference f13 between the first frequency f1 and the resonant point frequency f3 of the third resonance satisfies: f13 > 10% * f3, and the frequency difference f23 between the second frequency f2 and the resonant point frequency f3 of the third resonance satisfies: f23 > 10% * f3.

7. The mobile terminal as described in claim 6, characterized in that, The frequency difference f13 between the first frequency f1 and the resonant frequency f3 of the third resonance satisfies: f13 > 100MHz; the frequency difference f23 between the second frequency f2 and the resonant frequency f3 of the third resonance satisfies: f23 > 100MHz.

8. The mobile terminal as described in claim 1, characterized in that, When the mobile terminal is in a flattened state, and the first radiator (6) is disposed on the first housing (1), the second radiator (7) is disposed on the second housing (2), and the third radiator (8) is disposed on the third housing (3), the satellite antenna is in a working state. The first radiator (6) is coupled to the ground through a branch of the first tuning circuit to form a first resonant structure, and the first resonant structure corresponds to a first frequency. The second radiator (7) is coupled to the ground through a branch of the second tuning circuit to form a second resonant structure, which corresponds to a second frequency; the third radiator (8) is used to generate a third resonance, wherein the resonant frequency of the third resonance is within the first communication frequency band of the satellite antenna, the first frequency is higher than the first communication frequency band, and the second frequency is higher than the first communication frequency band.

9. The mobile terminal as described in claim 8, characterized in that, When the mobile terminal is in a flattened state and the third radiator (8) is disposed on the second housing (2), the satellite antenna is in a working state. The first radiator (6) is coupled to the ground through a branch of the first tuning circuit to form a first resonant structure, and the first resonant structure corresponds to a first frequency. The second radiator (7) is coupled to the ground through a branch of the second tuning circuit to form a second resonant structure, which corresponds to a second frequency; the third radiator (8) is used to generate a third resonance, wherein the frequency difference f13 between the first frequency f1 and the resonant point frequency f3 of the third resonance satisfies: f13 > 10% * f3, and the frequency difference f23 between the second frequency f2 and the resonant point frequency f3 of the third resonance satisfies: f23 > 10% * f3.

10. The mobile terminal as described in claim 9, characterized in that, The frequency difference f13 between the first frequency f1 and the resonant frequency f3 of the third resonance satisfies: f13 > 100MHz, and the frequency difference f23 between the second frequency f2 and the resonant frequency f3 of the third resonance satisfies: f23 > 100MHz.

11. The mobile terminal as described in claim 1, characterized in that, When the mobile terminal is in a flattened state, and the first radiator (6) is disposed on the first housing (1), the second radiator (7) is disposed on the second housing (2), and the third radiator (8) is disposed on the third housing (3), the satellite antenna is in a working state. The first radiator (6) is coupled to the ground through a branch of the first tuning circuit to form a first resonant structure, and the first resonant structure corresponds to a first frequency. The second radiator (7) is coupled to the ground through a branch of the second tuning circuit to form a second resonant structure, the second resonant structure corresponding to a second frequency; the third radiator (8) is used to generate a third resonance, wherein the first frequency and the resonant point frequency of the third resonance are within the first communication frequency band of the satellite antenna, and the second frequency is higher than the first communication frequency band.

12. The mobile terminal as described in claim 1, characterized in that, When the mobile terminal is in a flattened state, and the first radiator (6) is disposed on the first housing (1), the second radiator (7) is disposed on the second housing (2), and the third radiator (8) is disposed on the third housing (3), the satellite antenna is in a working state. The first radiator (6) is coupled to the ground through a branch of the first tuning circuit to form a first resonant structure, and the first resonant structure corresponds to a first frequency. The second radiator (7) is coupled to the ground plane through a branch of the second tuning circuit to form a second resonant structure, which corresponds to a second frequency; the third radiator (8) is used to generate a third resonance. Wherein, the frequency difference f13 between the first frequency f1 and the resonant frequency f3 of the third resonance satisfies: f13≤10%*f3, and the frequency difference f23 between the second frequency f2 and the resonant frequency f3 of the third resonance satisfies: f23>10%*f3.

13. The mobile terminal as described in claim 12, characterized in that, The frequency difference f13 between the first frequency f1 and the resonant frequency f3 of the third resonance satisfies: 0 ≤ f13 ≤ 100MHz, and the frequency difference f23 between the second frequency f2 and the resonant frequency f3 of the third resonance satisfies: f23 > 100MHz.

14. The mobile terminal as described in any one of claims 1 to 13, characterized in that, The first housing (1) includes a first support surface (101) for supporting the flexible display screen (200), the second housing (2) includes a second support surface (201) for supporting the flexible display screen (200), and the third housing (3) includes a third support surface (301) for supporting the flexible display screen (200). When the first support surface (1) and the second support surface (2) are coplanar, the third support surface (3) intersects with the second support surface (2), and the third radiator (8) is disposed on the second housing (2), the satellite antenna is in working state. The first radiator (6) is coupled to the ground through another branch of the first tuning circuit to form a fourth resonant structure, which corresponds to a fourth frequency. The second radiator (7) is coupled to the ground through another branch of the second tuning circuit to form a fifth resonant structure, which corresponds to a fifth frequency. The third radiator (8) is used to generate a sixth resonance, wherein the fifth frequency and the resonant point frequency of the sixth resonance are within the second communication frequency band of the satellite antenna. The fourth frequency is higher than the second communication frequency band.

15. The mobile terminal as described in any one of claims 1 to 13, characterized in that, The first housing (1) includes a first support surface (101) for supporting the flexible display screen (200), the second housing (2) includes a second support surface (201) for supporting the flexible display screen (200), and the third housing (3) includes a third support surface (301) for supporting the flexible display screen (200). When the first support surface (1) and the second support surface (2) are coplanar, the third support surface (3) intersects with the second support surface (2), and the third radiator (8) is disposed on the second housing (2), the satellite antenna is in working state. The first radiator (6) is coupled to the ground through another branch of the first tuning circuit to form a fourth resonant structure, which corresponds to a fourth frequency. The second radiator (7) is coupled to the ground through another branch of the second tuning circuit to form a fifth resonant structure, which corresponds to a fifth frequency. The third radiator (8) is used to generate a sixth resonance, wherein the frequency difference f46 between the fourth frequency f4 and the resonant point frequency f6 of the sixth resonance satisfies: f46 > 10% * f6, and the frequency difference f56 between the fifth frequency f5 and the resonant point frequency f6 of the sixth resonance satisfies: f56 ≤ 10% * f3.

16. The mobile terminal as described in claim 15, characterized in that, The frequency difference f46 between the fourth frequency f4 and the resonant frequency f6 of the sixth resonance satisfies: f46 > 100MHz; the frequency difference f56 between the fifth frequency f5 and the resonant frequency f6 of the sixth resonance satisfies: 0 ≤ f56 ≤ 100MHz.

17. The mobile terminal as described in any one of claims 1 to 13, characterized in that, The first housing (1) includes a first support surface (101) for supporting the flexible display screen (200), the second housing (2) includes a second support surface (201) for supporting the flexible display screen (200), and the third housing 3 includes a third support surface (301) for supporting the flexible display screen (200). When the first support surface (1) and the second support surface (2) are coplanar, the third support surface (3) intersects with the second support surface (2), and the first radiator (6) is disposed on the first housing (1), the second radiator (7) is disposed on the second housing (2), and the third radiator (8) is disposed on the third housing (3), the satellite antenna is in working state. The first radiator (6) is coupled to the ground through another branch of the first tuning circuit to form a fourth resonant structure, which corresponds to a fourth frequency. The second radiator (7) is coupled to the ground through another branch of the second tuning circuit to form a fifth resonant structure, which corresponds to a fifth frequency. The third radiator (8) is used to generate a sixth resonance. The resonant point frequencies of the fifth and sixth resonances are within the second communication frequency band of the satellite antenna, and the fourth frequency is higher than the second communication frequency band.

18. The mobile terminal as described in any one of claims 1 to 13, characterized in that, The first housing (1) includes a first support surface (101) for supporting the flexible display screen (200), the second housing (2) includes a second support surface (201) for supporting the flexible display screen (200), and the third housing 3 includes a third support surface (301) for supporting the flexible display screen (200). When the first support surface (1) and the second support surface (2) are coplanar, the third support surface (3) intersects with the second support surface (2), and the first radiator (6) is disposed on the first housing (1), the second radiator (7) is disposed on the second housing (2), and the third radiator (8) is disposed on the third housing (3), the satellite antenna is in working state. The first radiator (6) is coupled to the ground through another branch of the first tuning circuit to form a fourth resonant structure, which corresponds to a fourth frequency. The second radiator (7) is coupled to the ground through another branch of the second tuning circuit to form a fifth resonant structure, which corresponds to a fifth frequency. The third radiator (8) is used to generate a sixth resonance. The frequency difference f46 between the fourth frequency f4 and the resonant point frequency f6 of the sixth resonance satisfies: f46 > 10% * f6. The frequency difference f56 between the fifth frequency f5 and the resonant point frequency f6 of the sixth resonance satisfies: f56 ≤ 10% * f6.

19. The mobile terminal as described in claim 18, characterized in that, The frequency difference f46 between the fourth frequency f4 and the resonant frequency f6 of the sixth resonance satisfies: f46 > 100MHz, and the frequency difference f56 between the fifth frequency f5 and the resonant frequency f6 of the sixth resonance satisfies: 0 ≤ f56 ≤ 100MHz.

20. The mobile terminal according to any one of claims 1 to 13, characterized in that, The first housing (1) includes a first support surface (101) for supporting the flexible display screen (200), the second housing (2) includes a second support surface (201) for supporting the flexible display screen (200), and the third housing 3 includes a third support surface (301) for supporting the flexible display screen (200). When the first support surface (1) and the second support surface (2) are coplanar, the third support surface (3) intersects with the second support surface (2), and the first radiator (6) is disposed on the first housing (1), the second radiator (7) is disposed on the second housing (2), and the third radiator (8) is disposed on the third housing (3), the satellite antenna is in working state. The first radiator (6) is coupled to the ground through another branch of the first tuning circuit to form a fourth resonant structure, which corresponds to a fourth frequency. The second radiator (7) is coupled to the ground through another branch of the second tuning circuit to form a fifth resonant structure, which corresponds to a fifth frequency. The third radiator (8) is used to generate a sixth resonance. The resonant point frequencies of the fourth frequency, the fifth frequency, and the sixth resonance are all within the second communication frequency band of the satellite antenna.

21. The mobile terminal as described in any one of claims 1 to 13, characterized in that, The first housing (1) includes a first support surface (101) for supporting the flexible display screen (200), the second housing (2) includes a second support surface (201) for supporting the flexible display screen (200), and the third housing 3 includes a third support surface (301) for supporting the flexible display screen (200). When the first support surface (1) and the second support surface (2) are coplanar, the third support surface (3) intersects with the second support surface (2), and the first radiator (6) is disposed on the first housing (1), the second radiator (7) is disposed on the second housing (2), and the third radiator (8) is disposed on the third housing (3), the satellite antenna is in working state. The first radiator (6) is coupled to the ground through another branch of the first tuning circuit to form a fourth resonant structure, which corresponds to a fourth frequency. The second radiator (7) is coupled to the ground through another branch of the second tuning circuit to form a fifth resonant structure, which corresponds to a fifth frequency. The third radiator (8) is used to generate a sixth resonance. The frequency difference f46 between the fourth frequency f4 and the resonant point frequency f6 of the sixth resonance satisfies: f46≤10%*f6. The frequency difference f56 between the fifth frequency f5 and the resonant point frequency f6 of the sixth resonance satisfies: f56≤10%*f6.

22. The mobile terminal as described in claim 21, characterized in that, The frequency difference f46 between the fourth frequency f4 and the resonant frequency f6 of the sixth resonance satisfies: 0 ≤ f46 ≤ 100 MHz, and the frequency difference f56 between the fifth frequency f5 and the resonant frequency f6 of the sixth resonance satisfies: 0 ≤ f56 ≤ 100 MHz.

23. The mobile terminal as described in any one of claims 14 to 22, characterized in that, The included angle α between the third support surface and the second support surface satisfies: 45°≤α≤135°.

24. The mobile terminal as described in any one of claims 1 to 23, characterized in that, The first housing (1) includes a first support surface (101) for supporting the flexible display screen (200), the second housing (2) includes a second support surface (201) for supporting the flexible display screen (200), and the third housing (3) includes a third support surface (301) for supporting the flexible display screen (200). When the first support surface (101) and the second support surface (201) are coplanar, and the third support surface (301) is opposite to the second support surface (201), the satellite antenna is in working state. The first radiator (6) is coupled to the ground through another branch of the first tuning circuit to form a seventh resonant structure, which corresponds to a seventh frequency. The second radiator (7) is coupled to the ground through another branch of the second tuning circuit to form an eighth resonant structure, which corresponds to an eighth frequency. The third radiator (8) is used to generate a ninth resonance. The resonant frequency of the ninth resonance is within the third communication frequency band of the satellite antenna. The seventh frequency is higher than the third communication frequency band, and the eighth frequency is higher than the third communication frequency band.

25. The mobile terminal as described in any one of claims 1 to 23, characterized in that, The first housing (1) includes a first support surface (101) for supporting the flexible display screen (200), the second housing (2) includes a second support surface (201) for supporting the flexible display screen (200), and the third housing (3) includes a third support surface (301) for supporting the flexible display screen (200). When the first support surface (101) and the second support surface (201) are coplanar, and the third support surface (301) is opposite to the second support surface (201), the satellite antenna is in working state. The first radiator (6) is coupled to the ground through another branch of the first tuning circuit to form a seventh resonant structure, which corresponds to the seventh frequency. The second radiator (7) is coupled to the ground through another branch of the second tuning circuit to form an eighth resonant structure, which corresponds to the eighth frequency. The third radiator (8) is used to generate a ninth resonance. The frequency difference f79 between the seventh frequency f7 and the resonant point frequency f9 of the ninth resonance satisfies: f79 > 10% * f9. The frequency difference f89 between the eighth frequency f8 and the resonant point frequency f9 of the ninth resonance satisfies: f89 > 10% * f9.

26. The mobile terminal as described in claim 25, characterized in that, The frequency difference f79 between the seventh frequency f7 and the resonant frequency f9 of the ninth resonance satisfies: f79 > 100MHz, and the frequency difference f89 between the eighth frequency f8 and the resonant frequency f9 of the ninth resonance satisfies: f89 > 100MHz.

27. The mobile terminal according to any one of claims 1 to 26, characterized in that, The satellite antenna also includes a first feed point (9), and the satellite radio frequency link is coupled to the third radiator (8) through the first feed point (9); when the first radiator (6) is disposed in the first housing (1), the second radiator (7) is disposed in the third housing (3), and the third radiator (8) is disposed in the second housing (2), the distance between the first feed point (9) and the axis of the first rotating shaft mechanism (4) is greater than the distance between the first feed point (9) and the axis of the second rotating shaft mechanism (5).

28. The mobile terminal according to any one of claims 1 to 27, characterized in that, The satellite antenna also includes a third switch assembly (12), which is coupled to the third radiator (8); When the third switch assembly (12) is in the first conducting state, the satellite antenna is in the transmitting state; when the third switch assembly (12) is in the second conducting state, the satellite antenna is in the receiving state.

29. The mobile terminal as described in claim 28, characterized in that, When the satellite antenna is in the transmitting state, the first radiator (6) is connected to the first branch of the first tuning circuit; When the satellite antenna is in receiving mode, the first radiator (6) is connected to the second branch of the first tuning circuit.

30. The mobile terminal as described in claim 29, characterized in that, When the satellite antenna is in transmit or receive mode, the first radiator is connected to the same branch of the first tuning circuit.

31. The mobile terminal according to any one of claims 1 to 30, characterized in that, The mobile terminal has at least two folded states. For any two folded states, when the satellite antenna is in the working state, the first radiator is connected to different branches of the first tuning circuit, and the second radiator is connected to different branches of the second tuning circuit.

32. The mobile terminal according to any one of claims 1 to 30, characterized in that, When the mobile terminal is in different folded states and the satellite antenna is in working state, the first radiator is connected to the same branch of the first tuning circuit, and the second radiator is connected to the same branch of the second tuning circuit.

33. The mobile terminal according to any one of claims 1 to 32, characterized in that, When the satellite antenna is in a non-operating state, the first radiator is coupled to the first antenna radio frequency link and is used to generate a first resonance, the resonant frequency of which is within the communication frequency band of the first antenna.

34. The mobile terminal as described in claim 33, characterized in that, The resonant frequency f of the first radiator satisfies: 2500MHz≤f≤2700MHz.

35. The mobile terminal as described in claim 34, characterized in that, The mobile terminal controls the state of the first tuning circuit via a cellular radio frequency link.

36. The mobile terminal according to any one of claims 1 to 35, characterized in that, The mobile terminal controls the state of the second tuning circuit via a cellular radio frequency link or a satellite radio frequency link.

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