Antenna system and terminal device

Abstract

Embodiments of the present application provide an antenna system and a terminal device, the antenna system being used in the terminal device. The antenna system comprises a first radiator, a second radiator, a first feed structure, a second feed structure, and an adjustment unit. A gap is provided between the first radiator and the second radiator, and the adjustment unit is connected between the first radiator and the second radiator. The adjustment unit has an on state and an off state, and the adjustment unit is used to implement electrical conduction between the first radiator and the second radiator in the on state. When the adjustment unit is in the on state, the first feed structure receives a feed, and excites the first radiator and the second radiator to generate a third resonance, or the second feed structure receives a feed, and excites the first radiator and the second radiator to generate a fourth resonance. The present application, by means of turning on the adjustment unit, causing different radiators in the antenna system to jointly participate in radiation, can optimize radiation performance of the antenna system, thereby meeting terminal device communication requirements.

Description

Antenna system and terminal device

[0001] The present application claims priority to the Chinese patent application No. 202411391725.8, filed on September 30, 2024, entitled "Antenna system and terminal device", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

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

[0003] With the increasing performance requirements of terminal devices, more and more communication systems are used on terminal devices. Meanwhile, the use scenarios of terminal devices are diverse and complex, such as voice calls, handheld Internet access, etc. In some scenarios, the human body close to the terminal device will cause frequency deviation or radiation absorption, thereby causing the performance of the antenna in the working frequency band to decline. Currently, a tuning device is generally used in the antenna of the terminal device. The tuning device determines the change of impedance through the front-end circuit when the human body is close to the terminal device and optimizes the impedance, thereby optimizing the performance of the antenna when the human body is close to the terminal device. However, such a technical solution can only be used on a single system, and there is a great probability of negative yield for the application of multiple systems.

[0004] Therefore, it is an important direction for business research and development to design an antenna system with multiple communication systems, which can adjust the performance of the multiple system antenna that declines due to changes in the surrounding environment, to meet the communication needs of the terminal device. SUMMARY

[0005] The present application provides an antenna system and a terminal device. By connecting a regulating unit between multiple communication systems of the antenna system, the regulating unit has a disconnected state and a conductive state. When the surrounding environment of the terminal device changes and causes the performance of the antenna to decline, the regulating unit is turned on so that the communication system in the working state can use the radiator of the communication system in the non-working state, which can improve the overall radiation efficiency of the antenna system, and thereby improve the performance of the antenna system that declines due to changes in the surrounding environment.

[0006] In a first aspect, an embodiment of the present application provides an antenna system, comprising a first radiator, a second radiator, a first feeding structure, a second feeding structure and a regulating unit, the first radiator and the second radiator have a gap therebetween, the first feeding structure is electrically connected to the first radiator and is configured to receive a first feeding, the second feeding structure is electrically connected to the second radiator and is configured to receive a second feeding, the regulating unit is connected between the first radiator and the second radiator, the regulating unit has a conducting state and a non-conducting state, the regulating unit is configured to realize electrical conduction between the first radiator and the second radiator in the conducting state, and realize electrical non-conduction between the first radiator and the second radiator in the non-conducting state; in the non-conducting state, the first feeding structure receives the first feeding and excites the first radiator to generate a first resonance, and the second feeding structure receives the second feeding and excites the second radiator to generate a second resonance, a frequency range of the first resonance is different from a frequency range of the second resonance; in the conducting state, the first feeding structure receives the first feeding and excites the first radiator and the second radiator to generate a third resonance, or the second feeding structure receives the second feeding and excites the first radiator and the second radiator to generate a fourth resonance; the third resonance covers a same frequency band as the first resonance, and the fourth resonance covers a same frequency band as the second resonance.

[0007] In the present application, the regulating unit is connected between the first radiator and the second radiator, the regulating unit has a conducting state and a non-conducting state, in the non-conducting state, the first feeding structure receives the first feeding and excites the first radiator to generate the first resonance, and the second feeding structure receives the second feeding and excites the second radiator to generate the second resonance, so that the first antenna with the first resonance and the second antenna with the second resonance of the antenna system are independent communication systems. In the conducting state, the first radiator and the second radiator generate a new resonance together. For example, before the regulating unit is conducted, the first feeding structure receives the first feeding and the second feeding structure does not receive the second feeding, after the regulating unit is conducted, the first radiator and the second radiator are electrically conducted, the current distribution of the antenna system changes, and the first feeding received by the first feeding structure excites the first radiator and the second radiator to generate the third resonance; or before the regulating unit is conducted, the second feeding structure receives the second feeding and the first feeding structure does not receive the first feeding, after the regulating unit is conducted, the first radiator and the second radiator are electrically conducted, the current distribution of the antenna system changes, and the second feeding received by the second feeding structure excites the first radiator and the second radiator to generate the fourth resonance. The above can improve the radiation efficiency of the antenna system which is reduced due to changes in the surrounding environment.

[0008] In a possible implementation, the antenna system comprises a first antenna and a second antenna, the first antenna comprises the first radiator and the first feeding structure, the second antenna comprises the second radiator and the second feeding structure, and the first antenna and the second antenna belong to different communication systems respectively. For example, the first antenna and the second antenna can be antennas of different systems, the first antenna can be a wifi antenna, and the second antenna can be a cellular antenna; or the first antenna and the second antenna can be antennas of different frequency bands of the same system, the first antenna can be a low-frequency antenna, and the second antenna can be a medium-high-frequency antenna. The adjustment unit provided in the application can realize electrical conduction and electrical disconnection between antennas of different communication systems, thereby improving the radiation efficiency of the antenna system which is reduced due to changes in the surrounding environment.

[0009] In a possible implementation, the first antenna is a wifi antenna, and the second antenna is a cellular antenna. The application scheme can improve the radiation efficiency of the antenna system through the common communication system of the current terminal device, for example, by adjusting the electrical conduction of the wifi antenna and the cellular antenna, one of the wifi antenna and the cellular antenna which is not excited by the feeding can be reused and participate in generating a new resonance mode, thereby improving the radiation efficiency of the antenna system which is reduced due to changes in the surrounding environment.

[0010] In a possible implementation, the adjustment unit comprises an adjustable device connected between the first radiator and the second radiator, the adjustable device has a conduction state and a disconnection state, and the conduction state and the disconnection state of the adjustable device are switched by changing a parameter of the adjustable device. The scheme sets the adjustable device, such as a resistor, a capacitor or an inductor, in the adjustment unit, so that the switching of the adjustment unit between the conduction state and the disconnection state can be realized by changing the device value of the adjustable device, which is beneficial to efficiently optimizing the performance of the antenna system which is reduced due to changes in the surrounding environment.

[0011] In a possible implementation, the adjustment unit comprises a switching switch and a branch group connected in series between the first radiator and the second radiator, the branch group comprises a first branch and a second branch, the first branch is connected to the first radiator, the second branch is in a disconnection state with the first radiator, the switching switch is in communication with the first branch in a first state to realize electrical conduction between the first radiator and the second radiator, and the switching switch is in communication with the second branch in a second state to realize electrical disconnection between the first radiator and the second radiator. The scheme sets the switching switch and the branch group in the adjustment unit, so that the switching of the adjustment unit between the conduction state and the disconnection state can be quickly realized, which is beneficial to efficiently optimizing the performance of the antenna system which is reduced due to changes in the surrounding environment.

[0012] In a possible implementation, in the second state, the second branch is electrically connected between the second radiator and the ground, and the second branch is configured to adjust the operating frequency band of the second resonance. When the switch and the second branch are connected, the operating frequency band of the second radiator can be adjusted and the impedance of the second radiator can be optimized by changing the device value of the adjustable device in the second branch, thereby facilitating optimization of the performance of the antenna system that decreases due to changes in the surrounding environment.

[0013] In a possible implementation, the antenna system further includes a first device electrically connected between the first radiator and the ground, and the first device is configured to adjust the operating frequency band of the first resonance when the adjusting unit is in the off state, and to adjust the operating frequency band of the third resonance or the fourth resonance when the adjusting unit is in the on state. When the performance of the antenna system decreases due to changes in the surrounding environment, the first device can improve the radiation efficiency of the first radiator by changing the device value of the first device to optimize the impedance of the first radiator. In addition, for example, when the first radiator is in a non-operating state, the adjusting unit in the on state can connect the first radiator and the second radiator, that is, the first antenna and the second antenna. At this time, the second radiator is in an operating state, and the first device can optimize the impedance of the first radiator and the second radiator, that is, the first device can have a tuning function for the fourth resonance generated by the first radiator and the second radiator, so that the antenna system has better radiation performance at the fourth resonance.

[0014] In a possible implementation, the number of the first devices is at least two, and the at least two first devices are arranged at different positions of the first radiator. In this scheme, at least two first devices are arranged, and when the performance of the antenna system decreases due to changes in the surrounding environment, the at least two first devices jointly optimize the impedance of the first radiator, and the impedance can have a larger range and more values, thereby facilitating optimization of the performance of the antenna system that decreases due to changes in the surrounding environment.

[0015] In a possible implementation, both ends of the first radiator are open ends. In this scheme, both ends of the first radiator are arranged as open ends, and the first radiator can perform first resonance radiation at both ends after receiving the feed from the first feed structure, thereby facilitating optimization of the performance of the antenna system that decreases due to changes in the surrounding environment.

[0016] The antenna system further comprises a second device electrically connected between the second radiator and the ground, the second device being configured to adjust the operating frequency band of the second resonance when the adjusting unit is in the off state, and being configured to adjust the operating frequency band of the third resonance or the fourth resonance when the adjusting unit is in the on state. When the performance of the antenna system is degraded due to changes in the surrounding environment, the second device can improve the radiation efficiency of the second radiator by changing its device value to optimize the impedance of the second radiator. In addition, taking the second radiator as an example in a non-operating state, the adjusting unit in the on state can connect the first radiator and the second radiator, i.e., the first antenna and the second antenna. At this time, the first radiator is in an operating state, and the second device can simultaneously optimize the impedance of the first radiator and the second radiator, i.e., the first device can have a tuning function for the third resonance generated by the first radiator and the second radiator together, so that the antenna system has better radiation performance at the third resonance.

[0017] In a possible implementation, the second radiator has an open end adjacent to one end of the first radiator and a grounded end away from the other end of the first radiator. When the performance of the antenna system is degraded due to changes in the surrounding environment, the adjusting unit changes to the on state and connects the first radiator and the second radiator, at this time, the second radiator and the first radiator can jointly participate in the tuning of the antenna, and the second radiator can radiate at the open end adjacent to the first radiator, which is conducive to optimizing the performance of the antenna system degraded due to changes in the surrounding environment.

[0018] In a possible implementation, the antenna system further comprises a third radiator arranged on the frame of the terminal device, the first radiator is located between the second radiator and the third radiator, a gap is formed between the third radiator and the first radiator, and the third radiator is grounded at an end away from the gap. In this scheme, by arranging the third radiator in the antenna system, when the first radiator is excited by the feed received by the first feed structure, the third radiator and the first radiator can jointly participate in the generation of the first resonance, which is conducive to optimizing the performance of the antenna system.

[0019] In a possible implementation manner, the antenna system includes a first parasitic radiator, a second parasitic radiator, and a parasitic adjusting unit. The first parasitic radiator and the second parasitic radiator have a gap therebetween. The first parasitic radiator is arranged opposite to the first radiator, and the second parasitic radiator is arranged opposite to the second radiator. The gap between the first parasitic radiator and the second parasitic radiator is opposite to the gap between the first radiator and the second radiator. The parasitic adjusting unit has a conducting state and a non-conducting state. The parasitic adjusting unit is connected between the first parasitic radiator and the second parasitic radiator. The parasitic adjusting unit is used to be in the conducting state when the adjusting unit is in the conducting state, so as to realize electrical conduction between the first parasitic radiator and the second parasitic radiator. The parasitic adjusting unit is used to be in the non-conducting state when the adjusting unit is in the non-conducting state, so as to realize electrical disconnection between the first parasitic radiator and the second parasitic radiator. According to the scheme, the first parasitic radiator, the second parasitic radiator, and the parasitic adjusting unit are arranged in the antenna system. The parasitic adjusting unit is connected between the first parasitic radiator and the second parasitic radiator. When the surrounding environment of the antenna system changes, the adjusting unit can be in the conducting state and connect the first radiator and the second radiator, and the parasitic adjusting unit can be in the conducting state and connect the first parasitic radiator and the second parasitic radiator. For example, when the first feeding structure receives feeding and the second feeding structure does not receive feeding, the second radiator can participate in tuning of the antenna together with the first radiator, and the second parasitic radiator can participate in tuning of the antenna together with the first parasitic radiator, so as to improve the radiation performance of the antenna in a third resonant state. Alternatively, when the second feeding structure receives feeding and the first feeding structure does not receive feeding, the first radiator can participate in tuning of the antenna together with the second radiator, and the first parasitic radiator can participate in tuning of the antenna together with the second parasitic radiator, so as to improve the radiation performance of the antenna in a fourth resonant state. The above can improve the radiation efficiency of the antenna system as a whole, and thus improve the performance of the antenna system that decreases due to changes in the surrounding environment.

[0020] In a second aspect, an embodiment of the present application provides an antenna system, comprising a first radiator, a second radiator, a feeding structure and an adjusting unit, the first radiator and the second radiator are arranged on a frame of a terminal device and have a gap between them, the feeding structure is electrically connected to the first radiator or the second radiator and is used to receive a feeding, the adjusting unit is connected between the first radiator and the second radiator, the adjusting unit has a conducting state and a non-conducting state, the adjusting unit is used to realize electrical disconnection between the first radiator and the second radiator in the non-conducting state, so that the first radiator and the second radiator are excited to generate a first resonant mode and a second resonant mode, and the adjusting unit is used to realize electrical connection between the first radiator and the second radiator in the conducting state, so that the first radiator and the second radiator are excited to generate a third resonant mode, and the third resonant mode covers a working frequency band of the second resonant mode.

[0021] The adjusting unit is connected between the first radiator and the second radiator, when the surrounding environment of the antenna system changes, the adjusting unit can be in the conducting state and connect the first radiator and the second radiator, so that the third resonant mode generated by the antenna system disappears, for example, in an embodiment, the antenna system can be a slot antenna, the first resonant mode is a C mode, the second resonant mode is a D mode, the adjusting unit is in the conducting state, a third resonant mode is formed, the third resonant mode covers the working frequency band of the second resonant mode, and the third resonant mode and the second resonant mode have the same current distribution. The overall radiation efficiency of the antenna system can be improved by the adjusting unit, which is beneficial to optimize the performance of the antenna system which decreases due to the change of the surrounding environment.

[0022] The adjusting unit is connected between the first radiator and the second radiator, wherein the adjusting unit has a conducting state and a non-conducting state, in the non-conducting state, the feeding structure receives the feeding and excites the first radiator to generate the first resonant mode and excites the second radiator to generate the second resonant mode. In the conducting state, the first radiator and the second radiator generate a new third resonant mode together, so as to improve the radiation efficiency of the antenna system which decreases due to the change of the surrounding environment.

[0023] In a possible implementation, in the first resonant mode, the currents on the first radiator and the second radiator are opposite, in the second resonant mode, the currents on the first radiator and the second radiator are in the same direction, and in the third resonant mode, the currents on the first radiator and the second radiator are in the same direction. This makes the first radiator and the second radiator generate a new third resonant mode together when the adjusting unit is in the conducting state, the current distribution of the third resonant mode is the same as that of the second resonant mode, and the present application is beneficial to improve the radiation efficiency of the antenna system which decreases due to the change of the surrounding environment.

[0024] In a possible implementation, the antenna system further includes a fifth device connected to the first radiator and the second radiator, and configured to tune the operating frequency range of the third resonant mode when the tuning unit is in the on state. When the performance of the antenna system is degraded due to changes in the surrounding environment, the fifth device can improve the radiation efficiency of the antenna system by changing its device value to optimize the impedance of the first radiator and the second radiator.

[0025] In a third aspect, an embodiment of the present application provides a terminal device including a frame and the antenna system of the first aspect or the second aspect, and the first radiator and the second radiator are formed on the frame.

[0026] The first radiator and the second radiator of the antenna system of the first aspect or the second aspect are formed on the frame of the terminal device, and when the surrounding environment of the terminal device changes, for example, the terminal device is held by hand and the radiation performance is degraded, the antenna system can improve the radiation efficiency degraded due to changes in the surrounding environment, and finally optimize the performance degraded due to changes in the surrounding environment of the terminal device.

[0027] In a possible implementation, the terminal device includes a control system configured to control the adjustment unit to be in the on state when the first feeding structure receives the feeding and the second feeding structure does not receive the feeding, or control the adjustment unit to be in the on state when the second feeding structure receives the feeding and the first feeding structure does not receive the feeding. When the first feeding structure receives the feeding and the second feeding structure does not receive the feeding, the control system controls the adjustment unit to be in the on state, and the first radiator and the second radiator are electrically connected, the current distribution on the antenna system changes, and the first feeding structure receives the feeding to excite the first radiator and the second radiator to generate the third resonance; or when the second feeding structure receives the feeding and the first feeding structure does not receive the feeding, the control system controls the adjustment unit to be in the on state, and the first radiator and the second radiator are electrically connected, the current distribution on the antenna system changes, and the second feeding structure receives the feeding to excite the first radiator and the second radiator to generate the fourth resonance. The above can improve the radiation efficiency of the antenna system.

[0028] In a possible implementation, the terminal device comprises a control system, which is configured to control the adjustment unit to be in a conducting state when the first feeding structure receives feeding and the second feeding structure does not receive feeding, and the impedance of the first radiator changes to a preset range, or to control the adjustment unit to be in the conducting state when the second feeding structure receives feeding and the first feeding structure does not receive feeding, and the impedance of the second radiator changes to the preset range. When the first feeding structure receives feeding and the second feeding structure does not receive feeding, the impedance of the first radiator changes to the preset range due to being held by a hand, and the radiation efficiency of the first resonance decreases. The control system controls the adjustment unit to be in the conducting state, and the first radiator and the second radiator are electrically connected. The current distribution on the antenna system changes, and the feeding received by the first feeding structure excites the first radiator and the second radiator to generate the third resonance, thereby improving the radiation efficiency of the antenna system. Or when the second feeding structure receives feeding and the first feeding structure does not receive feeding, the impedance of the second radiator changes to the preset range due to being held by a hand, and the radiation efficiency of the second resonance decreases. The control system controls the adjustment unit to be in the conducting state, and the first radiator and the second radiator are electrically connected. The current distribution on the antenna system changes, and the feeding received by the second feeding structure excites the first radiator and the second radiator to generate the fourth resonance, thereby improving the radiation efficiency of the antenna system. Through the above process, the control system can accurately and efficiently control the adjustment unit to switch to the conducting state when the surrounding environment of the antenna system changes, thereby improving the radiation efficiency of the antenna system which is reduced due to the change of the surrounding environment.

[0029] In a possible implementation, the terminal device comprises a control system, which is configured to control the adjustment unit to be in a conducting state when the first feeding structure receives feeding and the second feeding structure does not receive feeding, and the impedance of the first radiator changes to a preset range, or to control the adjustment unit to be in the conducting state when the second feeding structure receives feeding and the first feeding structure does not receive feeding, and the impedance of the second radiator changes to the preset range. When the first feeding structure receives feeding and the second feeding structure does not receive feeding, the impedance of the first radiator changes to the preset range due to being held by a hand, and the radiation efficiency of the first resonance decreases. The control system controls the adjustment unit to be in the conducting state, and the first radiator and the second radiator are electrically connected. The current distribution on the antenna system changes, and the feeding received by the first feeding structure excites the first radiator and the second radiator to generate the third resonance, thereby improving the radiation efficiency of the antenna system. Or when the second feeding structure receives feeding and the first feeding structure does not receive feeding, the impedance of the second radiator changes to the preset range due to being held by a hand, and the radiation efficiency of the second resonance decreases. The control system controls the adjustment unit to be in the conducting state, and the first radiator and the second radiator are electrically connected. The current distribution on the antenna system changes, and the feeding received by the second feeding structure excites the first radiator and the second radiator to generate the fourth resonance, thereby improving the radiation efficiency of the antenna system. Through the above process, the control system can accurately and efficiently control the adjustment unit to switch to the conducting state when the surrounding environment of the antenna system changes, thereby improving the radiation efficiency of the antenna system which is reduced due to the change of the surrounding environment. BRIEF DESCRIPTION OF DRAWINGS

[0030] FIG. 1A is a schematic diagram of a terminal device according to an embodiment of the present application;

[0031] FIG. 1B is a schematic diagram of a terminal device according to an embodiment of the present application;

[0032] FIG. 2 is a schematic diagram of an antenna system of a terminal device according to an embodiment of the present application;

[0033] Fig. 3 is a schematic diagram of an antenna system of a terminal device according to an embodiment of the present application;

[0034] Fig. 4 is a schematic diagram of an antenna system of a terminal device according to an embodiment of the present application;

[0035] Fig. 5 is a schematic diagram of an antenna system of a terminal device according to an embodiment of the present application;

[0036] Fig. 6 is a schematic diagram of the cooperation structure of the adjusting unit, the first radiator, the gap and the second radiator shown in Fig. 5;

[0037] Fig. 7 is a control flowchart of an antenna system according to an embodiment of the present application;

[0038] Fig. 8 is a control flowchart of an antenna system according to an embodiment of the present application;

[0039] Fig. 9 is a schematic diagram of an antenna system applied in a terminal device according to an embodiment of the present application;

[0040] Fig. 10 is a schematic diagram of the terminal device shown in Fig. 9 being held in a certain case;

[0041] Fig. 11 is a return loss curve diagram of the antenna system shown in Fig. 9 in certain cases;

[0042] Fig. 12 is a return loss curve diagram of an antenna system without the adjusting unit based on the antenna system shown in Fig. 9;

[0043] Fig. 13 is a total efficiency and radiation efficiency curve diagram of the antenna system in certain cases of the antenna system shown in Fig. 9;

[0044] Fig. 14 is a total efficiency and radiation efficiency curve diagram of an antenna system without the adjusting unit based on the antenna system shown in Fig. 9;

[0045] Fig. 15 is a return loss curve diagram of the antenna system shown in Fig. 9 when operating in the B3, B1 and B7 frequency bands;

[0046] Fig. 16 is an S parameter diagram of the antenna system shown in Fig. 9 in free space;

[0047] Fig. 17 is a return loss curve diagram of the antenna system shown in Fig. 9 when operating in the B8 frequency band;

[0048] Fig. 18 is a total efficiency and radiation efficiency curve diagram of the antenna system when operating in the B8 frequency band of the antenna system shown in Fig. 9;

[0049] Fig. 19 is a return loss curve diagram of the antenna system according to an embodiment of the present application when operating in the B3, B1 and B7 frequency bands;

[0050] FIG. 20 is a comparison diagram of total efficiencies of an antenna system with an adjustment unit and an antenna system without an adjustment unit according to an embodiment of the present application;

[0051] FIG. 21 is a diagram of an antenna system of a terminal device according to an embodiment of the present application;

[0052] FIG. 22 is a graph of total efficiency and radiation efficiency of the antenna system in some cases of the antenna system shown in FIG. 21;

[0053] FIG. 23 is a diagram of a terminal device in a case of being held by a hand according to an embodiment of the present application;

[0054] FIG. 24 is a diagram of a terminal device according to an embodiment of the present application;

[0055] FIG. 25 is a diagram of a terminal device according to an embodiment of the present application;

[0056] FIG. 26 is a diagram of a terminal device according to an embodiment of the present application;

[0057] FIG. 27 is a diagram of an antenna system of a terminal device according to an embodiment of the present application;

[0058] FIG. 28 is a graph of return loss of the antenna system in some cases of the antenna system shown in FIG. 27;

[0059] FIG. 29 is a graph of total efficiency and radiation efficiency of the antenna system in some cases of the antenna system shown in FIG. 27.

[0060] 100 - terminal device; 101 - display screen; 102 - bezel; 1021 - first side; 1022 - bottom side; 1023 - second side; 1024 - third side; 20 - antenna system; 21 - first antenna; 211 - first radiator; 212 - first device; 213 - third radiator; 214 - fourth device; 215 - auxiliary adjustment unit; 216 - first parasitic radiator; 22 - second antenna; 221 - second radiator; 222 - second device; 223 - fourth radiator; 224 - third device; 225 - second parasitic radiator; 23 - first feeding structure; 24 - second feeding structure; 25 - adjustment unit; 251 - adjustable device; 252 - switching switch; 253 - branch group; 2531 - first branch; 25311 - device one; 25321 - device two; 2532 - second branch; 2533 - third branch; 2534 - fourth branch; 26 - slot; 27 - slot; 28 - first parasitic antenna; 29 - second parasitic antenna; 30 - radio frequency chip; 31 - slot; 321 - fifth device; 33 - feeding structure. DETAILED DESCRIPTION

[0061] Explanation of some terms

[0062] Radiator (or antenna element): is a device in an antenna used to receive / send electromagnetic wave radiation. In some cases, "antenna" is understood in a narrow sense as a radiator (or antenna element) that changes guided wave energy from a transmitter into radio waves, or converts radio waves into guided wave energy for radiating and receiving radio waves. The modulated high frequency current energy (or guided wave energy) produced by the transmitter is transmitted via a feed line to the transmitting radiator (or antenna element), which converts it into electromagnetic wave energy of some polarization and radiates it in the desired direction. The receiving radiator (or antenna element) converts electromagnetic wave energy of some polarization from a certain direction in space into modulated high frequency current energy, which is delivered via a feed line to the input of the receiver.

[0063] The radiator (or antenna branch) can include a conductor with a specific shape and size, such as a wire shape, or a patch shape, etc. The present application does not limit the specific shape. In one embodiment, the wire-shaped radiator (or antenna branch) can be simply referred to as a wire antenna. In one embodiment, the wire-shaped radiator can be implemented by a conductive bezel, which can also be referred to as a bezel antenna. In one embodiment, the wire-shaped radiator (or antenna branch) can be implemented by a support conductor, which can also be referred to as a support antenna. In one embodiment, the wire diameter (e.g., including thickness and width) of the wire-shaped radiator, or the radiator of the wire antenna, is much smaller (e.g., less than 1 / 16 of the wavelength) than the wavelength (e.g., the medium wavelength), and the length can be comparable to the wavelength (e.g., the medium wavelength) (e.g., the length is about 1 / 8 of the wavelength, or 1 / 8 to 1 / 4, or 1 / 4 to 1 / 2, or longer). The main forms of the wire antenna include a dipole antenna, a half-wave vibrator antenna, a monopole antenna, a loop antenna, an inverted F antenna (also referred to as IFA), and a planar inverted F antenna (also referred to as PIFA). For example, for a dipole antenna, each dipole antenna generally includes two radiating branches, and each branch is fed by a feed from the feed end of the radiating branch. For example, the inverted F antenna (IFA) can be regarded as being obtained by adding a ground path to a monopole antenna. The IFA antenna has a feed point and a ground point, and is called an inverted F antenna because its side view is in the shape of an inverted F. In one embodiment, the patch-shaped radiator (or antenna branch) can include a microstrip antenna, or a patch antenna. In one embodiment, the patch-shaped radiator (or antenna branch) can be implemented by a planar conductor (e.g., a conductive patch or a conductive coating, etc.). In one embodiment, the patch-shaped radiator (or antenna branch) can include a conductive patch, such as a copper patch, etc. In one embodiment, the patch-shaped radiator (or antenna branch) can include a conductive coating, such as silver paste, etc. The shape of the patch-shaped radiator includes a circular shape, a rectangular shape, a ring shape, etc. The structure of the microstrip antenna generally includes a dielectric substrate, a radiator (or antenna branch), and a ground plate, wherein the dielectric substrate is arranged between the radiator (or antenna branch) and the ground plate.

[0064] The radiators (or antenna elements) can also include slots or gaps formed on the conductors, e.g., closed or semi-closed slots or gaps formed on the grounded conductor plane. In one embodiment, the slotted or gapped radiators can be referred to as slot antennas or gap antennas. In one embodiment, the slots or gaps of the slot antennas / gap antennas have a radial dimension (e.g., including width) much smaller than the wavelength (e.g., dielectric wavelength) (e.g., less than 1 / 16 of the wavelength), and a length dimension comparable to the wavelength (e.g., dielectric wavelength) (e.g., around 1 / 8 of the wavelength, or 1 / 8 to 1 / 4, or 1 / 4 to 1 / 2, or longer). In one embodiment, the radiators with closed slots or gaps can be referred to as closed slot antennas. In one embodiment, the radiators with semi-closed slots or gaps (e.g., with openings added to the closed slots or gaps) can be referred to as open slot antennas. In some embodiments, the gap shape is long strip-shaped. In some embodiments, the length of the gap is about half of the wavelength (e.g., dielectric wavelength). In some embodiments, the length of the gap is about an integer multiple of the wavelength (e.g., one dielectric wavelength). In some embodiments, the gap can be fed by a transmission line across one or both of its sides, whereby the gap is excited with radio frequency electromagnetic field and radiates electromagnetic waves into space. In one embodiment, the radiators of the slot antennas or gap antennas can be implemented by conductive frames grounded at both ends, which can also be referred to as frame antennas; in this embodiment, it can be considered that the slot antennas or gap antennas include linear radiators spaced apart from the ground plane and grounded at both ends of the radiators, thereby forming closed or semi-closed slots or gaps. In one embodiment, the radiators of the slot antennas or gap antennas can be implemented by bracket conductors grounded at both ends, which can also be referred to as bracket antennas.

[0065] Ground / Ground Plate: can refer to at least one part of any ground layer, or ground plate, or ground metal layer, or any combination of the above in an electronic device (such as a mobile phone), and can be used for grounding of components in the electronic device. 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 electronic device, a ground plate formed by a middle frame of the electronic device, a ground metal layer formed by a metal film under the screen, a conductive ground layer of a battery, and a conductive or metal 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. In one embodiment, the circuit board includes a dielectric substrate, a ground layer, and a trace layer, and the trace layer and the ground layer are electrically connected by a via. In one embodiment, components such as a display, a touch screen, an input button, a transmitter, a processor, a memory, a battery, a charging circuit, a system on chip (SoC) structure, etc. can be mounted on or connected to the circuit board; or electrically connected to the trace layer and / or the ground layer in the circuit board. For example, a radio frequency source is disposed on the trace layer.

[0066] Any ground layer, or ground plate, or ground metal layer described above is 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.

[0067] Grounding: refers to coupling with the above ground / Ground Plate through a grounding structure and / or a grounding circuit. In one embodiment, grounding can be physical grounding, such as physical grounding (or referred to as physical ground) at a specific position on the bezel through a part of the structure of the middle frame. In one embodiment, grounding can be device grounding, such as device grounding (or referred to as device ground) through capacitors / inductors / resistors in series or parallel.

[0068] Resonance / resonance frequency: Resonance frequency is also called resonant frequency. Resonance frequency can have a frequency range, i.e., a frequency range in which resonance occurs. Resonance frequency can be a frequency range in which return loss characteristic is less than -6 dB. The frequency corresponding to the strongest 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 first resonance mentioned in the antenna / radiator "generates the first resonance" in this application should be the fundamental mode resonance generated by the antenna / radiator, or the lowest frequency resonance generated by the antenna / radiator in a certain antenna mode. It should be understood that the antenna / radiator can generate one or more antenna modes according to the specific design, and each antenna mode can correspond to generate a fundamental mode resonance.

[0069] Resonance frequency band: The range of resonance frequency is the resonance frequency band, and the return loss characteristic of any frequency point in the resonance frequency band can be less than -6 dB or -5 dB.

[0070] Communication frequency band / working frequency band: Regardless of the type of antenna, it always works in a certain frequency range (bandwidth). For example, an antenna supporting B40 frequency band has a working frequency band including frequencies in the range of 2300 MHz to 2400 MHz, or in other words, the working frequency band of the antenna includes the B40 frequency band. The frequency range that meets the index requirements can be regarded as the working frequency band of the antenna.

[0071] The resonance frequency band and the working frequency band can be the same or different, or the frequency range thereof can partially overlap. In one embodiment, one or more resonance frequency bands of an antenna can cover one or more working frequency bands of the antenna.

[0072] Electric length: It can refer to the ratio of physical length (i.e., mechanical length or geometric length) to the wavelength of the transmitted electromagnetic wave, and the electric length can satisfy the following formula:

[0073] Wherein, L is the physical length, and λ is the wavelength of the electromagnetic wave.

[0074] Wavelength: or working wavelength, which can be the wavelength corresponding to the center frequency of the resonance frequency or the center frequency of the working frequency band supported by the antenna. For example, assuming that the center frequency of the B1 uplink frequency band (resonance frequency including any frequency in the range of 1920 MHz to 1980 MHz) includes 1955 MHz, the working wavelength can be the wavelength calculated using the frequency of 1955 MHz. Not limited to the center frequency, the "working wavelength" can also refer to the wavelength corresponding to a non-center frequency of the resonance frequency or the working frequency band.

[0075] It should be understood that the wavelength (working wavelength) can be understood as the wavelength of the electromagnetic wave in the medium, for example, the wavelength of the electromagnetic wave generated by the radiator in the medium and the wavelength in the vacuum satisfy the following formula:

[0076] wherein, le is the wavelength of electromagnetic wave in the medium, lc is the wavelength of electromagnetic wave in vacuum, and er is the relative dielectric constant of the medium in the medium layer. The wavelength in the embodiments of the present application generally refers to the medium wavelength, which can be the medium wavelength corresponding to the center frequency of the resonance frequency, or the medium wavelength corresponding to the center frequency of the working frequency band supported by the antenna. For example, assuming that the center frequency of the B1 uplink frequency band (the resonance frequency includes any frequency in the range of 1920MHz to 1980MHz) includes 1955MHz, the wavelength can be the medium wavelength calculated by using the frequency of 1955MHz. Not limited to the center frequency, the "medium wavelength" can also refer to the medium wavelength corresponding to a non-center frequency of the resonance frequency or the working frequency band. For the convenience of understanding, the medium wavelength mentioned in the embodiments of the present application can be simply calculated by the relative dielectric constant of the medium filled on one side or multiple sides of the radiator.

[0077] Coupling: can be understood as direct coupling and / or indirect coupling, "coupling connection" can be understood as direct coupling connection and / or indirect coupling connection. Direct coupling can also be referred to as "electrical connection", which is understood as physical contact and electrical conduction between components; it can also be understood as the form of connection between different components in the circuit structure through the entity circuit of printed circuit board (PCB) copper foil or wire that can transmit electrical signals; "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, the equivalent capacitor formed by the coupling between the gap between the two conductive parts to realize signal transmission.

[0078] Ground structure / feeding structure, the ground structure / feeding structure can include a connecting piece, such as a metal spring, the radiator is coupled to the ground plate through the ground structure / the feeding structure is coupled to the feeding circuit. In some embodiments, the feeding structure can include a transmission line / feeding line, and the ground structure can include a ground line.

[0079] Feeding line, also known as transmission line, refers to the connection line between the transceiver of the antenna and the radiator. Transmission lines 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 called the feeding point. Transmission lines include wire transmission lines, coaxial transmission lines, waveguides, or microstrip lines, etc. Transmission lines can include support antenna bodies or glass antenna bodies according to different implementation forms. Transmission lines can be realized by LCP (Liquid Crystal Polymer), FPC (Flexible Printed Circuit), or PCB (Printed Circuit Board) according to different carriers.

[0080] End / point: the "end / point" of the first end / second end / feed end / ground end / feed point / ground point / connection point of the antenna radiator, which cannot be understood as a physical disconnected end or end part from other radiators, but also can be considered as a certain point or a certain section on the continuous radiator. In an embodiment, the "end / point" can include a connection / coupling area on the antenna radiator that is coupled to other conductive structures, for example, the feed end / feed point can be a coupling area (for example, an area facing a part of the feed structure) on the antenna radiator that is coupled to the feed structure, and for another example, the ground end / ground point can be a connection / coupling area on the antenna radiator that is coupled to the ground structure.

[0081] Open end, closed end: in some embodiments, the open end and the closed end are, for example, relative to whether the ground, the closed end is grounded, and the open end is not grounded. 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. 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 grounded end or a short circuit end. It should be understood that in some embodiments, other conductive bodies can be coupled to the open end to transfer coupled energy (which can be understood as transferring current).

[0082] In some embodiments, the understanding of the "closed end" can also be from the perspective of the current distribution, and the closed end or the grounded end, etc. can be understood as a current large point on the radiator, or a small point of the electric field on the radiator; in an embodiment, coupling electronic devices (such as capacitors, inductors, etc.) through the closed end can not change the current distribution characteristics of the current large point / small point of the electric field; in an embodiment, opening a slit (for example, a gap filled with insulating material) at or near the closed end can not change the current distribution characteristics of the current large point / small point of the electric field.

[0083] In some embodiments, the understanding of the "open end" can also be from the perspective of the current distribution, and the open end or the suspended end, etc. can be understood as a current small point on the radiator, or a large point of the electric field on the radiator; in an embodiment, coupling electronic devices (such as capacitors, inductors, etc.) through the open end can not change the current distribution characteristics of the current small point / large point of the electric field.

[0084] It should be understood that the radiator end at a gap (similar to the open end or the suspended end of the opening of the radiator from the structure of the radiator) coupled to electronic devices (such as capacitors, inductors, etc.) can make the radiator end a current large point / small point of the electric field, 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.

[0085] The current co-directional / counter-directional distribution mentioned in the embodiments of the present application should be understood as the direction of the main current on the same side of the conductor is co-directional / counter-directional. For example, when co-directional distribution current is excited on the conductor in a meandering shape or a ring shape (for example, the current path is also meandering or ring-shaped), it should be understood that, for example, the main current excited on the conductors on both sides of the ring-shaped conductor (for example, the conductors around a gap, on both sides of the gap) is counter-directional in terms of direction, but it still belongs to the definition of co-directional distribution current in the present application. In an embodiment, the co-directional current on one conductor can mean that the current on the conductor has no reversal point. In an embodiment, the counter-directional current on one conductor can mean that the current on the conductor has at least one reversal point. In an embodiment, the co-directional current on two conductors can mean that the currents on the two conductors have no reversal point and flow in the same direction. In an embodiment, the counter-directional current on two conductors can mean that the currents on the two conductors have no reversal point and flow in opposite directions. The co-directional / counter-directional current on multiple conductors can be understood accordingly.

[0086] The intermediate or intermediate position and the like mentioned in the embodiments of the present application are all ranges. For example, the intermediate (position) of the conductor can be a conductor portion including a midpoint on the conductor, for example, the intermediate (position) of the conductor can be a conductor portion on the conductor with a distance of less than a predetermined threshold (for example, 1 mm, 2 mm, or 2.5 mm) from the midpoint.

[0087] Total efficiency of the antenna system: refers to the ratio of the input power to the output power at the port of the antenna.

[0088] Radiation efficiency of the antenna: refers to the ratio of the power radiated into space (i.e., the power of the portion effectively converted into electromagnetic waves) to the active power input into the antenna. The active power input into 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. The radiation efficiency is a value for measuring the radiation capability of the antenna, and the metal loss and the dielectric loss are both factors affecting the radiation efficiency.

[0089] As understood by those skilled in the art, efficiency is generally expressed in percentage, and there is a corresponding conversion relationship between efficiency and dB. The closer the efficiency is to 0 dB, the better the efficiency of the antenna is represented.

[0090] Antenna return loss: can be understood as the ratio of the signal power reflected back to the antenna port through the antenna circuit to the antenna port transmitting power. The smaller the signal reflected back, the greater the signal radiated through the antenna to the space, and the greater the radiation efficiency of the antenna. The greater the signal reflected back, the smaller the signal radiated through the antenna to the space, and the smaller the radiation efficiency of the antenna.

[0091] The antenna return loss can be represented by the S11 parameter, which belongs to the S parameter. S11 represents the reflection coefficient, and this parameter can represent the advantages and disadvantages of the antenna transmission efficiency. S11 parameter is usually 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 actual energy entering the antenna, and the higher the system efficiency of the antenna; the larger the S11 parameter, the larger the antenna return loss, and the lower the system efficiency of the antenna. It should be noted that in engineering, -6dB is generally taken as the standard for S11 value, and 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.

[0092] Electrically connected and electrically disconnected: electrically connected can be understood as showing small impedance characteristics in the working frequency band, and electrically disconnected can be understood as showing large impedance characteristics in the working frequency band.

[0093] Parallel: the parallel defined in the present application is not limited to absolute parallel, and the definition of this parallel can be understood as substantially parallel, allowing not absolute parallel conditions caused by factors such as assembly tolerance, design tolerance, and structure flatness, allowing small angle range errors, for example, within 10 degrees of assembly error range, which can be understood as parallel relationship.

[0094] Vertical: the vertical defined in the present application is not limited to the relationship of absolute vertical intersection (included angle of 90 degrees), allowing not absolute vertical intersection relationship caused by factors such as assembly tolerance, design tolerance, and structure flatness, allowing small angle range errors, for example, within 80 degrees to 100 degrees of assembly error range, which can be understood as vertical relationship.

[0095] The terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second", and the like can explicitly or implicitly include one or more of the features.

[0096] The possible embodiments of the present application will be described below in combination with the drawings of the possible embodiments of the present application.

[0097] The antenna system provided by the embodiments of the present application is applied to a terminal device. The terminal device can be a portable terminal device, which is usually held by a hand during use, such as a mobile phone, a tablet, a wearable device, and the like. Taking the mobile phone as an example, the terminal device provided by the embodiments of the present application can also be a tablet device or a foldable device. For the foldable device, the terminal device provided by the embodiments of the present application can be a fold-in-half device (including a fold-in device and a fold-out device) or a multi-fold device (for example, a fold-in-three device). The antenna system provided by the embodiments of the present application can also be applied to a wearable device, such as a smart watch.

[0098] FIG. 1A is a schematic diagram of a terminal device 100 provided by an embodiment of the present application. Referring to FIG. 1A, in an embodiment, the terminal device 100 is a tablet device. The terminal device 100 includes a display screen 101 and a frame 102. The display screen 101 is configured to display images, videos, and the like. The frame 102 is arranged around the edge of the display screen 101. The display screen 101 and a back cover of the terminal device 100 are oppositely arranged. In an embodiment, the frame 102 and the back cover can be independent structural members, and the frame 102 is connected between the display screen 101 and the back cover. The terminal device 100 includes an antenna system 20 and a radio frequency chip 30. At least part of the antenna system 20 is formed on the frame 102. In FIG. 1A, the part in the rectangular dashed line box schematically represents at least part of the antenna system 20. The antenna system 20 includes a first antenna 21 and a second antenna 22. The first antenna 21 includes a first radiator 211 and a first feeding structure 23. The second antenna 22 includes a second radiator 221 and a second feeding structure 24. In an embodiment, a radio frequency signal is transmitted to the first feeding structure 23 by the radio frequency chip 30. The first feeding structure 23 receives the radio frequency signal and can excite the first radiator 211. A radio frequency signal is transmitted to the second feeding structure 24 by the radio frequency chip 30. The second feeding structure 24 receives the radio frequency signal and can excite the second radiator 221.

[0099] Referring to FIG. 1A, in an embodiment, the frame 102 includes an inner surface and an outer surface, the inner surface faces the internal space of the terminal device, and the outer surface is the appearance surface of the terminal device. The first feeding structure 23 is located on one side of the inner surface of the frame 102 and is connected to the first radiator 211. The second feeding structure 24 is located on one side of the inner surface of the frame 102 and is connected to the second radiator 221. In an embodiment, the first feeding structure 23 and the second feeding structure 24 can be electrically connected to the feeding circuit on the circuit board in the terminal device 100 through the metal spring or the radio frequency wire, the feeding circuit is electrically connected to the radio frequency chip 30, and is used to receive the radio frequency signal. In an embodiment, the feeding circuit can include a matching circuit, a tuning circuit, etc. In an embodiment, the first feeding structure 23 and the second feeding structure 24 can also be provided with devices, switches, etc. to realize feeding matching. In an embodiment, a plurality of antenna systems 20 can be provided on the frame 102, for example, in the embodiment shown in FIG. 1A, the frame 102 near the top of the terminal device and the frame 102 at the bottom of the terminal device can be provided with the antenna system 20.

[0100] FIG. 1B is a schematic diagram of the terminal device 100 provided by an embodiment of the present application. Referring to FIG. 1B, in an embodiment, the terminal device 100 is a folding device, and FIG. 1B shows a schematic diagram of the terminal device at a position in the process of converting from the unfolded state to the folded state. The terminal device 100 includes a device main body 103 and a display screen 101. The display screen 101 is assembled on the surface of the device main body 103. In an embodiment, the device main body 103 includes a first main body 1, a second main body 2, and a rotating shaft 3 located between the first main body 1 and the second main body 2, so that the first main body 1 and the second main body 2 can be relatively folded or unfolded. The display screen 101 includes a first part 201, a second part 203, and a bending part 202 connecting the first part 201 and the second part 203. The first part 201 is connected to the first main body 1, and the second part 203 is connected to the second main body 2. In the process of folding the first main body 1 and the second main body 2, the display screen 101 is located on the inner side of the folding direction, and in the process of folding the first main body 1 and the second main body 2, the first part 201 and the second part 203 are folded, and the bending part 202 is deformed by bending. In the folded state, the display screen 101 is between the first main body 1 and the second main body 2, and the first part 201 and the second part 203 are stacked. The antenna system 20 provided by the embodiment of the present application can be provided on the frame of the first main body 1 and the second main body 2, which can be the antenna system 20 as shown in the dashed box in FIG. 1B. In an embodiment, the radiator of the antenna system 20 provided on the first main body 1 can be a main radiator, and the radiator of the antenna system 20 provided on the second main body 2 can be a parasitic radiator.

[0101] Fig. 2 is a schematic diagram of an antenna system 20 of a terminal device according to an embodiment of the present application. As shown in Fig. 2 and in combination with Fig. 1A, the antenna system 20 includes a first antenna 21, a second antenna 22, and an adjusting unit 25. The first antenna 21 includes a first radiator 211 and a first feeding structure 23, and the second antenna 22 includes a second radiator 221 and a second feeding structure 24. The first antenna 21 and the second antenna 22 belong to different communication systems, for example, the first antenna 21 and the second antenna 22 can be antennas of different systems, the first antenna 21 can be a WiFi antenna, and the second antenna 22 can be a cellular antenna; or the first antenna 21 and the second antenna 22 can be antennas of different frequency bands of the same system, the first antenna 21 can be a low-frequency antenna, and the second antenna 22 can be a medium-high-frequency antenna. The first radiator 211 and the second radiator 221 are arranged on the frame 102 of the terminal device 100, and there is a gap 26 between the first radiator 211 and the second radiator 221. In an embodiment, the second radiator 221 is at least partially located on an extension path of the first radiator 211. The extension path of the first radiator 211 can be understood as an extension path of a main radiation branch of the first radiator 211. For example, the first radiator 211 can include a main radiation branch and a device arranged on the main radiation branch, the device can be used for adjusting frequency or matching impedance, etc., the main radiation branch can be linear, arc-shaped, etc., and a main radiation branch of the second radiator 221 can be located on the extension path of the first radiator 211. As shown in Fig. 2, the main radiation branch of the first radiator 211 is linear. The first feeding structure 23 is electrically connected to the first radiator 211 and is used for receiving feeding power to excite the first radiator 211 to generate a first resonance. The second feeding structure 24 is electrically connected to the second radiator 221 and is used for receiving feeding power to excite the second radiator 221 to generate a second resonance. The antenna system 20 provided by the embodiment of the present application is a dual-antenna system. The first feeding structure 23 and the first radiator 211 jointly construct the first antenna 21, and a working frequency range of the first antenna 21 includes a frequency range corresponding to the first resonance. The second feeding structure 24 and the second radiator 221 jointly construct the second antenna 22, and a working frequency range of the second antenna 22 includes a frequency range corresponding to the second resonance. In an embodiment, the working frequency range of the first resonance is staggered with the working frequency range of the second resonance. Specifically, there is a frequency difference between the working frequency range of the first resonance and the working frequency range of the second resonance. In an embodiment, the first antenna 21 is a low-frequency antenna, and the working frequency range of the first resonance includes but is not limited to B5, B8, and B28 frequency bands. In an embodiment, the first antenna 21 is a medium-high-frequency antenna, and the working frequency range of the second resonance includes but is not limited to B3, B1, B38, B39, B40, and B41 frequency bands.

[0102] Referring to Fig. 2, the adjusting unit 25 is connected between the first radiating body 211 and the second radiating body 221, and the adjusting unit 25 has a conducting state and a non-conducting state. In the conducting state, the adjusting unit 25 enables electrical conduction between the first radiating body 211 and the second radiating body 221, so as to improve the radiation performance of the antenna system. In the non-conducting state, the adjusting unit 25 enables electrical disconnection between the first radiating body 211 and the second radiating body 221. In the non-conducting state, the first feeding structure 23 receives the feeding and excites the first radiating body 211 to generate the first resonance, and the second feeding structure 24 receives the feeding and excites the second radiating body 221 to generate the second resonance, so as to realize that the first antenna 21 with the first resonance and the second antenna 22 with the second resonance of the antenna system 20 are independent communication systems. In the conducting state, the first radiating body 211 and the second radiating body 221 together generate a new resonance. For example, before the adjusting unit 25 is in the conducting state, in the case that the first feeding structure 23 receives the feeding and the second feeding structure 24 does not receive the feeding, after the adjusting unit 25 is in the conducting state, the first radiating body 211 and the second radiating body 221 are electrically connected, the current distribution on the antenna system 20 changes, the feeding received by the first feeding structure 23 excites the first radiating body 211 and the second radiating body 221 to generate a third resonance, and since the excitation source of the third resonance and the first resonance is the first feeding structure 23, the third resonance and the first resonance cover the same working frequency band. Or, before the adjusting unit 25 is in the conducting state, in the case that the second feeding structure 24 receives the feeding and the first feeding structure 23 does not receive the feeding, after the adjusting unit 25 is in the conducting state, the first radiating body 211 and the second radiating body 221 are electrically connected, the current distribution on the antenna system 20 changes, the feeding received by the second feeding structure 24 excites the first radiating body 211 and the second radiating body 221 to generate a fourth resonance, and since the excitation source of the fourth resonance and the second resonance is the second feeding structure 24, the fourth resonance and the second resonance cover the same working frequency band. Referring to Fig. 2, taking the case that the first feeding structure 23 receives the feeding and the second feeding structure 24 does not receive the feeding as an example, when the surrounding environment of the antenna system 20 changes, for example, a human body approaches the gap 26 and causes the efficiency of the first resonance generated by the first radiating body 211 to decrease, the adjusting unit 25 can be in the conducting state and connect the first radiating body 211 and the second radiating body 221. At this time, the second radiating body 221 can participate in the tuning of the antenna together with the first radiating body 211 and generate the third resonance, so as to improve the radiation efficiency of the antenna system 20.

[0103] Referring to Fig. 2, in an embodiment, the adjusting unit 25 comprises an adjustable device 251, the adjustable device 251 is connected between the first radiator 211 and the second radiator 221, the adjustable device 251 has a conducting state and a non-conducting state, and the conducting state and the non-conducting state of the adjustable device 251 are switched by changing a parameter of the adjustable device 251. In an embodiment, the adjustable device 251 is a switch, the switch is located at the gap and connected between the first radiator 211 and the second radiator 221. In an embodiment, the adjustable device 251 is an adjustable resistance, and the conducting state of the adjustable device is a state of 0 ohm. In an embodiment, the adjustable device 251 is an adjustable capacitance, and the conducting state of the adjustable device 251 is a state of greater than 10 pF in an antenna system 20 operating in a frequency band of 600 MHz to 1 GHz, a state of greater than 3 pF in an antenna system 20 operating in a frequency band of 1 GHz to 3 GHz, and a state of greater than 1 pF in an antenna system 20 operating in a frequency band of greater than 3 GHz. In an embodiment, the adjustable device 251 is an adjustable inductance, and the conducting state of the adjustable device 251 is a state of less than 10 nH in an antenna system operating in a frequency band of 600 MHz to 3 GHz, and a state of less than 5 nH in an antenna system 20 operating in a frequency band of greater than 3 GHz.

[0104] Referring to Fig. 2, in an embodiment, the first antenna 21 comprises the first radiator 211, the second antenna 22 comprises the second radiator 221, the second radiator 221 is located on an extension path of the first radiator 211, and the gap 26 is located between the first radiator 211 and the second radiator 221. The first feeding structure 23 is electrically connected to the first radiator 211 and is used to receive a feeding to make the first radiator 211 generate a first resonance. The second feeding structure 24 is electrically connected to the second radiator 221 and is used to receive a feeding to make the second radiator 221 generate a second resonance. In an embodiment, the first feeding structure 23 and the first radiator 211 can be an integrally formed structure, the first feeding structure 23 is electrically connected to a radio frequency chip in a terminal device to receive a radio frequency signal, and the second feeding structure 24 and the second radiator 221 can also be an integrally formed structure, the second feeding structure 24 is electrically connected to the radio frequency chip in the terminal device to receive the radio frequency signal. The adjusting unit 25 is connected to the first radiator 211 and the second radiator 221, the adjusting unit 25 is used to be non-conducting when the first feeding structure 23 and the second feeding structure 24 both receive the feeding, and the adjusting unit 25 is used to be conducting when the first feeding structure 23 or the second feeding structure 24 receives the feeding and it is needed to improve the radiation performance of the antenna system 20.

[0105] Referring to FIG. 2, in an embodiment, both ends of the first radiator 211 are open ends, and the two ends of the first radiator 211 are schematically a second open end C and a third open end D, respectively. In the embodiment, both ends of the first radiator 211 are provided as open ends, and the open ends are in a slot structure on the terminal device. The position of the slot can be an electric field intensity point. Such a design is conducive to optimizing the performance of the antenna system 20. In an embodiment, the second radiator 221 is adjacent to the first open end B of the first radiator 211, and the second radiator 221 is away from the first ground end A of the first radiator 211. In the embodiment, the end of the second radiator 221 adjacent to the first radiator 211 is an open end. When the performance of the antenna system 20 is reduced due to changes in the surrounding environment, the adjusting unit 25 can be in a conductive state to connect the first radiator 211 and the second radiator 221, so that the second radiator 221 can participate in the radiation of the radio frequency signal fed by the first feeding structure 23. The second radiator 221 and the first radiator 211 can jointly generate a third resonance, which is conducive to optimizing the performance of the antenna system 20 which is reduced due to changes in the surrounding environment.

[0106] Referring to FIG. 2, in an embodiment, the first feeding structure 23 is connected to the position of the first radiator 211 adjacent to the slot 26. The first feeding structure 23 adjacent to the slot 26 can be understood as the size of the part of the first radiator 211 between the first feeding structure 23 and the slot 26 being smaller than the size of the part of the first radiator 211 between the first feeding structure 23 and the third open end D. For example, the size of the part of the first radiator 211 between the first feeding structure 23 and the slot 26 is less than one fourth of the total length of the first radiator 211. The second feeding structure 24 is connected to the position of the second radiator 221 adjacent to the slot 26. The second feeding structure 24 adjacent to the slot 26 can be understood as the size of the part of the second radiator 221 between the second feeding structure 24 and the slot 26 being smaller than the size of the part of the second radiator 221 between the second feeding structure 24 and the first ground end A. For example, the size of the part of the second radiator 221 between the second feeding structure 24 and the slot 26 is less than one fourth of the total length of the second radiator 221. In the embodiment, the positions of the first radiator 211 and the second radiator 221 excited by the feeding are adjacent to the slot 26 between the first radiator 211 and the second radiator 221. The electric field intensity at the open end of the first radiator 211 adjacent to the second radiator 221 is increased, and the electric field intensity at the open end of the second radiator 221 adjacent to the first radiator 211 is increased, which can improve the radiation efficiency of the first radiator 211 and the second radiator 221, and is conducive to optimizing the performance of the antenna system 20.

[0107] Fig. 3 is a schematic diagram of an antenna system of a terminal device according to an embodiment of the present application. Referring to Fig. 3, in one embodiment, the antenna system 20 comprises a first antenna 21, a second antenna 22, a first feeding structure 23, a second feeding structure 24 and an adjusting unit 25. Compared with the embodiment shown in Fig. 2, the first antenna 21 further comprises a first device 212 electrically connected between the first radiator 211 and the ground. The first device 212 can be used to adjust the operating frequency band of the first resonance when the adjusting unit 25 is in the off state, and to adjust the operating frequency band of the third resonance or the fourth resonance when the adjusting unit 25 is in the on state. In one embodiment, the first device 212 can also be used to optimize the impedance of the first antenna 21 in the operating frequency band, which can maximize the performance of the first antenna 21. Fig. 3 schematically shows an embodiment in which one first device 212 is arranged on the first radiator 211. The present application does not limit the number of the first devices 212. In one embodiment, the number of the first devices 212 is at least two, and the at least two first devices 212 are arranged at different positions of the first radiator 211. The at least two first devices 212 can be used to adjust the operating frequency band of the first resonance together when the adjusting unit 25 is in the off state, to adjust the operating frequency band of the third resonance or the fourth resonance when the adjusting unit 25 is in the on state, and to optimize the impedance of the first antenna 21 in the operating frequency band. In one embodiment, the first device 212 is a device with fixed parameters, for example, the first device 212 is a capacitor with a fixed capacitance value. In one embodiment, the first device 212 is an adjustable device. Illustratively, the first device 212 can adjust the device value of the first device 212 by changing its own parameters, for example, the first device 212 can include a variable capacitor, a tuner or a diode; the first device 212 can also change its internal structure to load different devices, thereby changing the device value of the first device 212.

[0108] Referring to FIG. 3, the embodiment of the present application configures the first device 212 on the first radiator 211 to configure the first antenna 21, so that the first antenna 21 can work at the first resonance and has better radiation performance. In an implementation, when the surrounding environment of the antenna system 20 changes, for example, the frequency offset or radiation absorption caused by the human body close to the gap 26, and the performance of the antenna system 20 in the working frequency band decreases, the first device 212 can optimize the impedance of the first antenna 21 by changing the device value of itself to improve the radiation efficiency of the first antenna 21. In an implementation, when the first antenna 21 is in a non-working state, the adjusting unit 25 in the on state can connect the first antenna 21 and the second antenna 22, that is, connect the first radiator 211 and the second radiator 221. At this time, the second feeding structure 24 is in a receiving feeding state, and the first device 212 can be used to tune the fourth resonance generated by the first radiator 211 and the second radiator 221 together, so that the antenna system has better radiation performance at the fourth resonance.

[0109] FIG. 4 is a schematic diagram of an antenna system of a terminal device provided by the embodiment of the present application. Referring to FIG. 4, in an implementation, the antenna system 20 includes the first antenna 21, the second antenna 22, the first feeding structure 23, the second feeding structure 24, and the adjusting unit 25. Compared with the implementation shown in FIG. 3, in the present implementation, the number of the first device 212 is two, and the second antenna 22 further includes a second device 222, which is electrically connected between the second radiator 221 and the ground. The second device 222 can be used to adjust the working frequency band of the second resonance when the adjusting unit 25 is in the off state, and adjust the working frequency band of the third resonance or the fourth resonance when the adjusting unit 25 is in the on state. In an implementation, the second device 222 can also be used to optimize the impedance of the second radiator 221 in the working frequency band, which can improve the performance of the second radiator 221.

[0110] Referring to FIG. 4, in an embodiment, when the first antenna 21 is in a non-working state and the second radiator is in a working state, the adjusting unit 25 is in a conducting state and connected to the first radiator 211 and the second radiator 221, so that the first radiator 211 and the first device 212 can participate in the radiation tuning of the second antenna 22, the first device 212 and the second device 222 are jointly debugged, and the fourth resonance generated by the first radiator 211 and the second radiator 221 can be tuned through the first device 212 and the second device 222, so that the antenna system has better radiation performance at the fourth resonance. Similarly, when the first radiator is in a working state and the second radiator is in a non-working state, the adjusting unit 25 is in a conducting state and connected to the first radiator 211 and the second radiator 221, so that the second radiator 221 and the second device 222 can participate in the radiation tuning of the first antenna 21, the first device 212 and the second device 222 are jointly debugged, and the third resonance generated by the first radiator 211 and the second radiator 221 can be tuned through the first device 212 and the second device 222, so that the antenna system 20 has better radiation performance at the third resonance.

[0111] FIG. 5 is a schematic diagram of an antenna system of a terminal device provided in an embodiment of the present application, and FIG. 6 is a schematic diagram of the cooperation structure of the adjusting unit 25, the first radiator 211, the gap 26 and the second radiator 221 shown in FIG. 5. In an embodiment, the antenna system 20 includes the first antenna 21, the second antenna 22, the first feeding structure 23, the second feeding structure 24 and the adjusting unit 25. The adjusting unit 25 includes a switching switch 252 and a branch group 253 connected in series between the first radiator 211 and the second radiator 221, the switching switch 252 is connected to the second radiator 221 at a route far from one end of the branch group 253, the branch group 253 includes a first branch 2531 and a second branch 2532, the first branch 2531 is connected to the first radiator 211, and the second branch 2532 is in a disconnected state with the first radiator 211, the switching switch 252 is connected to the first branch 2531 in a first state to realize the electrical conduction between the first radiator 211 and the second radiator 221, and the switching switch 252 is connected to the second branch 2532 in a second state to realize the electrical disconnection between the first radiator 211 and the second radiator 221. In the adjusting unit 25, the switching switch 252 and the branch group 253 are arranged, so that the adjusting unit 25 can be quickly switched between the conducting state and the disconnected state, which is conducive to efficiently optimizing the performance of the antenna system 20.

[0112] Referring to FIG. 5 and FIG. 6, in an embodiment, the first branch 2531 includes a device one 25311 electrically connected between the switch 252 and the first radiator 211, and the second branch 2532 includes a device two 25321 electrically connected between the switch 252 and the ground. Illustratively, the device one 25311 and the device two 25321 can be capacitors, resistors, inductors, or a combination of at least part of the devices. When the switch 252 is in the first state, the switch 252 connects the second radiator 221, the first branch 2531, and the first radiator 211, and the feed received by the first feed structure 23 can be transmitted from the first radiator 211 to the second radiator 221 through the first branch 2531, so that the first radiator 211 is connected with the second radiator 221, and the first device 212 and the second device 222 are jointly debugged, and the third resonance generated by the first radiator 211 and the second radiator 221 can be tuned through the first device 212 and the second device 222, so that the antenna system 20 has better radiation performance at the third resonance. When the switch 252 is in the second state, the switch 252 connects the second radiator 221 and the second branch 2532, and the second branch 2532 is connected between the second radiator 221 and the ground, and the second branch 2532 can be used to adjust the operating frequency band of the second resonance, and the device two 25321 can be used to adjust the operating frequency band of the second radiator 221 and optimize the impedance of the second radiator 221.

[0113] In an embodiment, the branch group 253 can further include a third branch 2533 and a fourth branch 2534, and devices can also be arranged on the third branch 2533 and the fourth branch 2534, respectively. The devices are connected to the ground at the end away from the switch 252, and when the switch 252 is connected with the third branch 2533 or the fourth branch 2534, the devices can be used to adjust the second radiator 221 to work at a corresponding frequency band.

[0114] In an embodiment, the device one 25311 on the first branch 2531 can be an adjustable device. Similarly, the devices on the second branch 2532, the third branch 2533, and the fourth branch 2534 can also be adjustable devices, and the adjustment unit can load different devices by changing the internal structure, so that the parameters of the adjustment unit can be adjusted to match the requirements of different application scenarios.

[0115] Figure 7 is a control flow chart of the antenna system 20 according to an embodiment of the present application. In combination with Figure 5 and Figure 7, in an embodiment, the terminal device comprises a control system for controlling the adjustment unit 25 to be in the on state when the first feeding structure 23 receives the feeding and the second feeding structure 24 does not receive the feeding, or for controlling the adjustment unit 25 to be in the on state when the second feeding structure 24 receives the feeding and the first feeding structure 23 does not receive the feeding. The steps can include:

[0116] S100: determining whether one of the first feeding structure 23 and the second feeding structure 24 receives the feeding and the other does not receive the feeding; if the determination result is yes, proceeding to step S200, or if the determination result is no, proceeding to step S300.

[0117] S200: turning on the adjustment unit 25;

[0118] S300: turning off the adjustment unit 25.

[0119] That is, when both the first feeding structure 23 and the second feeding structure 24 receive the feeding, and both the first antenna 21 and the second antenna 22 are in operation, the control system makes the adjustment unit 25 in the off state, so as to realize that the first antenna 21 with the first resonance and the second antenna 22 with the second resonance are independent communication systems. When neither the first feeding structure 23 nor the second feeding structure 24 receives the feeding, and neither the first antenna 21 nor the second antenna 22 is in operation, the control system also makes the adjustment unit 25 in the off state.

[0120] When one of the first feeding structure 23 and the second feeding structure 24 receives the feeding and the other does not receive the feeding, the control system makes the adjustment unit 25 in the on state. For example, when only the first feeding structure 23 receives the feeding, the control system makes the adjustment unit 25 in the on state, and the first radiator 211 and the second radiator 221 are electrically connected, the current distribution on the antenna system 20 changes, and the feeding received by the first feeding structure 23 excites the first radiator 211 and the second radiator 221 to generate the third resonance; or when the second feeding structure 24 receives the feeding and the first feeding structure 23 does not receive the feeding, the control system makes the adjustment unit 25 in the on state when receiving the feeding, the first radiator 211 and the second radiator 221 are electrically connected, the current distribution on the antenna system 20 changes, and the feeding received by the second feeding structure 24 excites the first radiator 211 and the second radiator 221 to generate the fourth resonance.

[0121] Through the above flow, the control system can accurately and efficiently switch the adjustment unit 25 between the off state and the on state, which is conducive to improving the radiation efficiency of the antenna system 20.

[0122] Figure 8 is a control flow chart of the antenna system 20 according to an embodiment of the present application. In combination with Figure 5 and Figure 8, in one embodiment, the terminal device comprises a control system, which is configured to control the adjustment unit 25 to be in a conducting state when the first feeding structure 23 receives a feeding and the second feeding structure 24 does not receive a feeding, and the impedance of the first radiator 211 changes to a preset range, or the second feeding structure 24 receives a feeding and the first feeding structure 23 does not receive a feeding, and the impedance of the second radiator 221 changes to a preset range. The steps can include:

[0123] S100: determining whether one of the first feeding structure 23 and the second feeding structure 24 receives a feeding and the other does not receive a feeding; if the determination result is yes, performing step S110, and if the determination result is no, performing step S300.

[0124] S110: if the first feeding structure 23 receives a feeding and the second feeding structure 24 does not receive a feeding, determining whether the impedance of the first radiator 211 changes to a preset range; if the determination result is yes, performing step S200, and if the determination result is no, performing step S300; if the second feeding structure 24 receives a feeding and the first feeding structure 23 does not receive a feeding, determining whether the impedance of the second radiator 221 changes to a preset range; if the determination result is yes, performing step S200, and if the determination result is no, performing step S300.

[0125] S200: turning on the adjustment unit 25;

[0126] S300: turning off the adjustment unit 25.

[0127] When only one of the first feeding structure 23 and the second feeding structure 24 is receiving feeding, and the working radiator changes its impedance to the range preset by the control system due to the change of the surrounding environment, the control system makes the adjusting unit 25 in the on state. For example, when the first feeding structure 23 is receiving feeding, and the second feeding structure 24 is not receiving feeding, the first radiator 211 changes its impedance to the range preset by the control system due to being held by hand, at this time, the radiation efficiency of the first resonance is reduced, the control system makes the adjusting unit 25 in the on state, the first radiator 211 and the second radiator 221 are electrically connected, the current distribution on the antenna system 20 changes, the feeding received by the first feeding structure 23 excites the first radiator 211 and the second radiator 221 to generate the third resonance, thereby improving the radiation efficiency of the antenna system 20; or when the second feeding structure 24 is receiving feeding, and the first feeding structure 23 is not receiving feeding, the second radiator 221 changes its impedance to the range preset by the control system due to being held by hand, at this time, the radiation efficiency of the second resonance is reduced, the control system makes the adjusting unit 25 in the on state, the first radiator 211 and the second radiator 221 are electrically connected, the current distribution on the antenna system 20 changes, the feeding received by the second feeding structure 24 excites the first radiator 211 and the second radiator 221 to generate the fourth resonance, thereby improving the radiation efficiency of the antenna system 20. Through the above process, the control system can accurately and efficiently switch the adjusting unit 25 between the off state and the on state when the surrounding environment of the antenna system 20 changes, thereby improving the radiation efficiency of the antenna system 20 which is reduced due to the change of the surrounding environment.

[0128] Based on the above examples, whether only one of the first feeding structure 23 and the second feeding structure 24 is in the working state (the process of receiving feeding) and the other is in the non-working state can be determined through the icons on the display interface of the terminal device. For example, the first feeding structure 23 receives the signal of the WIFI antenna, and whether the first feeding structure 23 is in the working state can be determined through the WIFI icon on the display interface. For example, the second feeding structure 24 receives the cellular signal, and whether the second feeding structure 24 is in the working state can be determined through the icon corresponding to the cellular data on the display interface.

[0129] Figure 9 is a schematic diagram of the antenna system 20 applied in the terminal device 100 according to an embodiment of the present application. Referring to Figure 9, in one embodiment, the frame 102 of the terminal device 100 includes a first side 1021, and the antenna system 20 is arranged on the first side 1021. The antenna system 20 includes, in sequence along the extension direction of the first side 1021, a first grounding point A, a first open end B, a second open end C, a third open end D, a fourth open end E, and a second grounding end F. The top end of the second radiator 221 is adjacent to the first open end B of the first radiator 211, and the bottom end of the second radiator 221 is the first grounding point A. The top end of the first radiator 211 is the third open end D, and the bottom end of the first radiator 211 is adjacent to the second open end C of the second radiator 221. The gap 26 is located between the first open end B and the second open end C, and the gap 27 is located between the third open end D and the fourth open end E. In one embodiment, the distance between the top end of the antenna system 20, i.e., the fourth open end E, and the top of the terminal device 100 can be 16.2 mm, the distance between the fourth open end E and the first open end B can be 31 mm, and the distance between the first open end B and the first grounding point A can be 51 mm.

[0130] Referring to Figure 9, under the action of the feed received by the first feed structure 23, the first radiator 211 is excited to generate a first resonance. In one embodiment, the first antenna 21 is the radiator of a medium-high frequency antenna on a cellular system, and the frequency band of the first resonance can include different communication frequency bands, such as B3, B1, B38, B39, B40, and B41, etc. Under the action of the feed received by the second feed structure 24, the second radiator 221 is excited to generate a second resonance. In one embodiment, the second radiator 221 is the radiator of a low frequency antenna on a cellular system, and the frequency band of the second resonance can include different communication frequency bands, such as B5, B8, and B28, etc. When the second antenna 22 works independently, the second device 222 is used to adjust the work of the second antenna 22 on different communication frequency bands of low frequency. When the first antenna 21 works independently, the first device 212 can be used to adjust the work of the first antenna 21 on different communication frequency bands of medium-high frequency. When both the second antenna 22 and the first antenna 21 are in the working state, the adjusting unit 25 connected across the first open end B and the second open end C is disconnected, which can not affect the switching and work of independent frequency bands of the low frequency second antenna 22 and the medium-high frequency first antenna 21.

[0131] Figure 10 is a schematic diagram of the terminal device 100 being held in one case, the position of the gap between the first open end B and the second open end C is easy to be held by hand during use. In combination with Figure 9 and Figure 10, in one embodiment, when the second antenna 22 of the antenna system 20 is in working state and the first antenna 21 is in non-working state, the surrounding environment of the antenna system 20 changes and causes the antenna performance to decrease, for example, the gap 26 is held by hand, the adjusting unit 25 is turned on, at this time, the current distribution of the antenna system 20 at a certain time under the B8 working frequency band has three current large points and one current zero point, the first current large point is located at the second radiator 221, i.e. between the first grounding point A and the first open end B, because the second feed structure 24 receives the feed which directly acts on the second radiator 221; the second current large point is located at the gap 26, i.e. between the first open end B and the second open end C, because the adjusting unit 25 connected across the first open end B and the second open end C is turned on, the current on the second radiator 221 passes through the adjusting unit 25 connected across the gap 26; the third current large point is located at the first radiator 211, i.e. between the second open end C and the third open end D, because the second radiator 221 and the first radiator 211 are connected through the adjusting unit 25, the feed received by the second feed structure 24 can be transmitted from the second radiator 221 to the first radiator 211 through the adjusting unit 25, so that the first radiator 211 can be excited. The current zero point is located at the gap 27 beside the end of the first radiator 211 away from the second radiator 221, i.e. between the third open end D and the fourth open end E. In one embodiment, when the adjusting unit 25 is in the off state and the second radiator 221 works independently, the current distribution of the second antenna 22 at a certain time under the B8 working frequency band has one current large point and one current zero point, the current large point is located at the first grounding point A, and the current zero point is located between the first open end B and the second open end C, i.e. in the central region of the gap 26.

[0132] In combination with FIG. 9 and FIG. 10, in one embodiment, when the second antenna 22 of the antenna system 20 is in working state and the first antenna 21 is in non-working state, the surrounding environment of the antenna system 20 changes and causes the antenna performance to decrease, for example, the slot 26 is held by hand, the adjusting unit 25 is turned on, and the electric field distribution of the antenna system 20 at a certain time under the B8 working frequency band has an electric field large point. The electric field large point is located at the middle position of the first radiator 211, i.e., between the second open end C and the third open end D, because the adjusting unit 25 is turned on across the first open end B and the second open end C, the electric field of the slot 26 is weakened due to being held by hand, the electric field distribution of the whole antenna system 20 changes, the electric field strong point of the whole antenna system 20 is mainly on the first radiator 211, and finally the radiation efficiency of the antenna system 20 due to being held by hand can be improved. In one embodiment, when the first antenna 21 works independently, the first antenna 21 adopts the first radiator 211 as the main branch, and the first radiator 211 is in a suspended or electrically suspended state. The main mode of the first radiator 211 is a line D mode, also known as a 1 / 2 mode or a balanced mode of a line antenna. The first radiator 211 has two electric field large points in the half wavelength mode, one is located between the first open end B and the second open end C, i.e., at the slot 26, and the other is located between the third open end D and the fourth open end E, i.e., at the slot 27.

[0133] Fig. 11 is a return loss curve of the antenna system 20 in some cases shown in Fig. 9. In combination with Fig. 9 and Fig. 11, the S11 curve shown in Fig. 11 represents the S11 curve of the antenna system 20 shown in Fig. 9 when only the second feeding structure 24 receives the feeding (when the first feeding structure 23 is not working). For example, the second feeding structure 24 receives the feeding so that the second radiator 221 of the antenna system 20 works on the B8 frequency band to generate the second resonance. In the figure, the A1 curve in Fig. 11 is the return loss S22 curve of the second radiator 221 generated in the free space of the antenna system, which can be understood as the free space refers to the environment where the terminal device is not close to the environment affecting the antenna radiation performance, for example, not being held by hand, the position of the gap between the first open end B and the second open end C is not close to the human body or other environments affecting the antenna performance. In an embodiment, the return loss of the second radiator 221 in the free space can reach -16 dB, and the radiation performance of the antenna system is better. The C1 curve in Fig. 11 is the return loss S22 curve of the antenna system shown in Fig. 9 in the hand-held state shown in Fig. 10, when the adjusting unit 25 is in the off state and only the second device 222 is used to tune the radiation efficiency of the second radiator 221. In an embodiment, the return loss of the second radiator in the scenario shown by the C1 curve is -4 dB. The D1 curve in Fig. 11 is the return loss S22 curve of the antenna system shown in Fig. 9 in the hand-held state shown in Fig. 10, when the adjusting unit 25 is in the on state, the first radiator 211 and the second radiator 221 are electrically connected, the current distribution on the antenna system 20 changes, and the feeding received by the second feeding structure 24 excites the fourth resonance generated by the first radiator 211 and the second radiator 221. In an embodiment, the return loss of the fourth resonance generated by the first radiator 211 and the second radiator 221 in the scenario shown by the D1 curve is -6 dB, and the antenna performance can be improved by 2 dB+, as shown by the comparison between the C1 curve and the D1 curve. In an embodiment, when the adjusting unit 25 is in the on state, the first device 212 can be used to tune the second radiator 221 to improve the radiation efficiency of the second radiator 221, as shown by the comparison between the C1 curve and the D1 curve.

[0134] If the antenna system does not include the adjusting unit, in the state that the second radiator works independently, the working efficiency of the second radiator can only be adjusted by the second device, and better performance improvement cannot be obtained. FIG. 12 is a return loss curve of the antenna system 20 without the adjusting unit 25 based on the antenna system 20 shown in FIG. 9. The A1 curve in FIG. 12 is a return loss S22 curve of the antenna system in the state that the second radiator works independently and the antenna system is in free space, which can be understood as that the terminal device is not close to an environment that affects the antenna radiation performance, for example, is not held by hand, and the position of the gap between the first open end B and the second open end C is not close to a human body or other environment that affects the antenna performance. In an embodiment, the return loss of the second radiator in the free space can reach -16 dB, and the radiation performance of the antenna system is better. The B1 curve in FIG. 12 is a return loss S22 curve of the second radiator of the antenna system in the hand-held state. In an embodiment, the frequency corresponding to the peak point of the return loss curve of the second radiator changes, that is, the second radiator produces frequency deviation, and the return loss of the second radiator in the scenario shown by the B1 curve is -4 dB. The C1 curve in FIG. 12 is a return loss S22 curve of the antenna system in the hand-held state after the frequency range of the second radiator is tuned by the second device. The frequency deviation caused by the second radiator being held by hand can be partially eliminated, but the increased return loss cannot be reduced, as shown by the comparison between the B1 curve and the C1 curve.

[0135] Fig. 13 is a graph of total efficiency and radiation efficiency of the antenna system 20 in some cases of the antenna system 20 shown in Fig. 9, which represents the total efficiency and radiation efficiency curves of the antenna system shown in Fig. 9 when only the second feeding structure 24 receives the feeding (when the first feeding structure 23 is not working). The A2 curve in Fig. 13 is the radiation efficiency curve of the second radiator when the antenna system is in free space; the A3 curve in Fig. 13 is the total efficiency curve of the system when the antenna system is in free space. The C2 curve in Fig. 13 is the radiation efficiency curve when the antenna system is in the hand-held environment and the adjusting unit is in the off state; the C3 curve in Fig. 13 is the total efficiency curve of the system when the antenna system is in the hand-held environment and the adjusting unit is in the off state; the D2 curve in Fig. 13 is the radiation efficiency curve when the antenna system is in the hand-held environment and the adjusting unit is in the on state; the D3 curve in Fig. 13 is the total efficiency curve of the system when the antenna system is in the hand-held environment and the adjusting unit is in the on state. In combination with Fig. 9 and Fig. 13, when the surrounding environment of the antenna system 20 changes, for example, the second radiator 221 generates the second resonance due to the human body close to the gap 26, the efficiency decreases, the adjusting unit 25 can be in the on state and connect the first radiator 211 and the second radiator 221. At this time, the first antenna 21 and the second antenna 22 can jointly participate in the tuning of the antenna, the feeding received by the second feeding structure 24 excites the first radiator 211 and the second radiator 221 to generate the fourth resonance together, thereby improving the radiation efficiency of the fourth resonance of the antenna system 20. In the embodiment of the present application, the overall radiation efficiency of the second antenna 22 can be improved by about 2dB, as shown by the comparison of the D2 curve and the C2 curve.

[0136] In combination with Fig. 9 and Fig. 13, since the first device 212 is electrically connected with the first radiator 211 and the first radiator 211 and the second radiator 221 are connected through the adjusting unit 25, the first device 212 can be electrically connected with the second radiator 221, and at this time, the second device 222 can jointly serve as the device of the second radiator 221 with the first device 212. After the first device 212 and the second device 222 jointly achieve the impedance optimal condition realized by the system algorithm, the state of the first device 212 and the second device 222 is integrated, the impedance optimization of the second radiator 221 is completed, and the total efficiency of the system of the second radiator 221 can be improved. The optimization of the impedance of the second radiator 221 and the first radiator 211 jointly participating in the tuning of the antenna make the total efficiency of the system of the second antenna 22 improved by 2dB+ compared with the total efficiency of the system of the second antenna 22 without the adjusting unit 25 being disconnected, as shown by the comparison of the D3 curve and the C3 curve.

[0137] If the antenna system does not include the adjusting unit, in the state that the second radiator works independently, the radiation efficiency of the second radiator can only be adjusted by the second device, and the reduced radiation efficiency of the antenna system due to the change of the surrounding environment cannot be optimized. FIG. 14 is a diagram of the total efficiency and the radiation efficiency of the antenna system 20 without the adjusting unit 25 based on the antenna system 20 shown in FIG. 9. The A2 curve in FIG. 14 is the radiation efficiency curve of the antenna system without the adjusting unit in the state that the second radiator works independently, when the antenna system is in free space; the A3 curve in FIG. 14 is the total efficiency curve of the antenna system without the adjusting unit in the state that the second radiator works independently; the B2 curve in FIG. 14 is the radiation efficiency curve of the antenna system without the adjusting unit in the state that the second radiator works independently, when the antenna system is in the hand-held environment; the B3 curve in FIG. 14 is the total efficiency curve of the antenna system without the adjusting unit in the state that the second radiator works independently, when the antenna system is in the hand-held environment; the C2 curve in FIG. 14 is the radiation efficiency curve of the antenna system without the adjusting unit in the state that the second radiator works independently, when the antenna system is in the hand-held environment, after the adjustment by the device; and the C3 curve in FIG. 14 is the total efficiency curve of the antenna system without the adjusting unit in the state that the second radiator works independently, when the antenna system is in the hand-held environment, after the adjustment by the device. Referring to FIG. 9, in the case that the position of the slot 26 is affected by the hand-held environment close to the human body, i.e., after the environment between the first open end B and the second open end C is changed, the radiation efficiency of the second antenna 22 is reduced, as shown by the comparison between the A2 curve and the B2 curve, and the total efficiency of the second antenna 22 is reduced, as shown by the comparison between the A3 curve and the B3 curve. Since the present scheme does not have the adjusting unit, the radiation efficiency of the second radiator and the efficiency of the antenna system can only be adjusted by the second device. The radiation efficiency of the second radiator does not change before and after the adjustment, as shown by the comparison between the B2 curve and the C2 curve; since the total efficiency of the system represents the final antenna performance, the total efficiency of the system is related to the impedance and the radiation efficiency of the antenna, and thus when the impedance of the second radiator is optimized, the performance of the system can be improved, and the total efficiency of the second radiator system is increased, as shown by the comparison between the B3 curve and the C3 curve.

[0138] As can be seen from the comparison between FIG. 11 and FIG. 13, when the surrounding environment of the antenna system changes, for example, the performance of the antenna system is reduced due to the close of the human body, the adjusting unit is in the off state, and the adjustment is performed by the second device, the device can improve the frequency offset of the antenna system due to the change of the surrounding environment, but the increased return loss and the reduced radiation efficiency of the antenna system after being held by the hand cannot be improved. When the adjusting unit is turned on, the first device and the second device can jointly adjust, so that the return loss and the radiation efficiency of the antenna system affected by the change of the surrounding environment can be improved.

[0139] Fig. 15 is a return loss curve of the antenna system 20 shown in Fig. 9 when operating in the B3, B1 and B7 bands, referring to Fig. 15, in one embodiment, when the antenna system 20 operates in the B3 band, the two first devices 212 electrically connected to the first radiator 211 can be capacitors, one first device 212 can have a capacitance of 0.7p, and the other first device 212 can have a capacitance of 1.2p, the FB1 curve in Fig. 15 is the return loss S11 curve of the antenna system 20 when operating in the B3 band, within the B3 operating frequency band, the antenna system 20 has a return loss as low as -19dBa; in one embodiment, when the antenna system 20 operates in the B1 band, the two first devices 212 electrically connected to the first radiator 211 can be capacitors, one first device 212 can have a capacitance of 0.5p, and the other first device 212 can have a capacitance of 0.7p, the FB2 curve in Fig. 15 is the return loss S11 curve of the antenna system 20 when operating in the B1 band, within the B1 operating frequency band, the antenna system 20 has a return loss as low as -16dBa; in one embodiment, when the antenna system 20 operates in the B41 band, the two first devices 212 electrically connected to the first radiator 211 can be inductors, one first device 212 can have an inductance of 10n, and the other first device 212 can have an inductance of 15n; the FB3 curve in Fig. 15 is the return loss S11 curve of the antenna system 20 when operating in the B7 band, within the B7 operating frequency band, the antenna system 20 has a return loss as low as -9dBa. The antenna system 20 shown in Fig. 9 has good performance when operating independently in the medium-high frequency band.

[0140] Fig. 16 is an S parameter diagram of the antenna system 20 shown in Fig. 9 in free space, Fig. 17 is a return loss curve of the antenna system 20 shown in Fig. 9 when operating in the B8 band, referring to Figs. 16 and 17, the FB4 curve is the return loss S22 curve of the antenna system 20 when operating in the B8 band, within the B8 operating frequency band, the antenna system 20 has a lowest return loss of -19.28dBa at a feed frequency of 0.91644GHz, the antenna system 20 shown in Fig. 9 has good performance when operating in the low frequency B8 band.

[0141] Fig. 18 is a curve of the total efficiency and radiation efficiency of the antenna system 20 shown in Fig. 9 when operating in the B8 band, referring to Fig. 18, the dashed line LB1 represents the radiation efficiency of the antenna system 20 when operating in the B8 band, it can be seen that within the B8 operating frequency band, the average radiation efficiency of the antenna system 20 is higher than -6dBp. The solid line LB1 represents the total efficiency of the system of the antenna system 20 when operating in the B8 band, it can be seen that within the B8 operating frequency band, the average total efficiency of the system of the antenna system 20 is higher than -7dBp.

[0142] The above describes the performance of the antenna system 20 shown in FIG. 9 when the adjusting unit 25 is in the off state and the antenna system 20 independently works in the low frequency band and the medium-high frequency band. FIG. 19 is a graph of the return loss of the antenna system 20 provided by the embodiment of the present application when the antenna system 20 works in the B3, B1 and B7 frequency bands. In combination with FIG. 9 and FIG. 19, the solid FB1 curve in FIG. 19 is the return loss S11 curve of the antenna system without the adjusting unit when the antenna system works in the B3 frequency band; the dashed FB1 curve in FIG. 19 is the return loss S11 curve of the antenna system 20 shown in FIG. 9 when the antenna system works in the B3 frequency band; the solid FB2 curve in FIG. 19 is the return loss S11 curve of the antenna system without the adjusting unit when the antenna system works in the B1 frequency band; the dashed FB2 curve in FIG. 19 is the return loss S11 curve of the antenna system 20 shown in FIG. 9 when the antenna system works in the B1 frequency band; the solid FB3 curve in FIG. 19 is the return loss S11 curve of the antenna system without the adjusting unit when the antenna system works in the B7 frequency band; and the dashed FB3 curve in FIG. 19 is the return loss S11 curve of the antenna system 20 shown in FIG. 9 when the antenna system works in the B7 frequency band. It can be seen from FIG. 19 that whether the adjusting unit is present in the antenna system has little effect on the return loss S11 of the antenna system 20 when the antenna system works in the B3 frequency band, but has an effect on the return loss S11 of the antenna system 20 when the antenna system works in the B1 frequency band and the B7 frequency band.

[0143] FIG. 20 is a comparison diagram of the total efficiency of the antenna system with the adjusting unit and the antenna system without the adjusting unit provided by the embodiment of the present application. In combination with FIG. 9 and FIG. 20, the solid FB1 curve in FIG. 20 is the total efficiency curve of the antenna system without the adjusting unit when the antenna system works in the B3 frequency band; the dashed FB1 curve in FIG. 20 is the total efficiency curve of the antenna system 20 shown in FIG. 9 when the antenna system works in the B3 frequency band; the solid FB2 curve in FIG. 20 is the total efficiency curve of the antenna system without the adjusting unit when the antenna system works in the B1 frequency band; the dashed FB2 curve in FIG. 20 is the total efficiency curve of the antenna system 20 shown in FIG. 9 when the antenna system works in the B1 frequency band; the solid FB3 curve in FIG. 20 is the total efficiency curve of the antenna system without the adjusting unit when the antenna system works in the B7 frequency band; and the dashed FB3 curve in FIG. 20 is the total efficiency curve of the antenna system 20 shown in FIG. 9 when the antenna system works in the B7 frequency band. In combination with FIG. 9 and FIG. 20, it can be seen that the adjusting unit 25 present in the antenna system 20 has little effect on the total efficiency of the system when the first antenna 21 independently works in the B3 frequency band and the B1 frequency band, but has an average influence of about 0.3 dB on the total efficiency of the system when the first antenna 21 independently works in the B7 frequency band.

[0144] It can be seen from FIGS. 19 and 20 that when the first radiator in the antenna system works independently, the adjusting unit 25 arranged in the antenna system 20 has little influence on the performance of the first antenna 21 when working independently in the B3 frequency band and the B1 frequency band, and has a little influence on the performance of the first antenna 21 when working independently in the B7 frequency band.

[0145] In the two communication systems in the antenna system provided in the embodiments of the present application, the first radiator and the second radiator are both realized by a single stub. The scheme of the present application can also be used in a communication system realized by multiple stubs, and can improve the performance of the antenna system which is reduced due to changes in the surrounding environment.

[0146] FIG. 21 is a schematic diagram of the antenna system 20 of the terminal device 100 provided in the embodiments of the present application. In combination with FIG. 1A and FIG. 21, in an embodiment, the antenna system 20 includes the first antenna 21, the second antenna 22 and the adjusting unit 25. Compared with the antenna system 20 shown in FIG. 9, the first antenna 21 further includes a third radiator 213 arranged on the frame 102 of the terminal device 100, the first radiator 211 is located between the second radiator 221 and the third radiator 213, the third radiator 213 and the first radiator 211 form a gap 27, and one end of the third radiator 213 away from the gap 27 is grounded. In an embodiment, an auxiliary adjusting unit 215 is arranged between the third radiator 213 and the first radiator 211, the adjusting unit 25 is connected between the first radiator 211 and the second radiator 221, and the auxiliary adjusting unit 215 is connected between the first radiator 211 and the third radiator 213. The auxiliary adjusting unit 215 can have a function similar to that of the adjusting unit 25, and the resonance frequency and the radiation efficiency of the first radiator 211 are adjusted by the conduction and disconnection of the auxiliary adjusting unit 215. When the first radiator 211 works independently, when the auxiliary adjusting unit 215 is conducted, the first radiator 211, the gap 26 and the third radiator 213 together participate in the generation of the first resonance. The first device 212 is electrically connected to the first radiator 211, and when the adjusting unit 25 is disconnected and the first radiator 211 works independently, the first device 212 is used to adjust the required working frequency band. When the adjusting unit 25 is disconnected and the second radiator 221 works independently, the second device 222 is used to adjust the required working frequency band.

[0147] In one embodiment, the distance between the first ground end A of the second radiator 221 and the second open end C of the first radiator 211 is 51 mm. In one embodiment, the distance between the second open end C of the first radiator 211 and the third open end D of the first radiator 211 is 31 mm. The two ends of the third radiator 213 are the fourth open end E and the second ground end F, respectively, and the fourth open end E and the third open end D of the first radiator 211 form a gap 27. In one embodiment, the distance between the third open end D of the first radiator 211 and the second ground end F of the third radiator is 16.2 mm.

[0148] Fig. 22 is a graph of the total efficiency and the radiation efficiency of the antenna system 20 in some cases of the antenna system 20 shown in Fig. 21. Referring to Fig. 22, the A4 curve in Fig. 22 is the radiation efficiency curve of the antenna system 20 shown in Fig. 21 when it is working and in free space; the A5 curve in Fig. 22 is the total efficiency curve of the system of the antenna system 20 shown in Fig. 21 when it is working and in free space; the B4 curve in Fig. 22 is the radiation efficiency curve of the antenna system 20 shown in Fig. 21 when it is working and held by a hand; the B5 curve in Fig. 22 is the total efficiency curve of the system of the antenna system 20 shown in Fig. 21 when it is working and held by a hand; the C4 curve in Fig. 22 is the radiation efficiency curve of the antenna system 20 shown in Fig. 21 when it is working, held by a hand, and in one state of the adjustment unit being disconnected; the C5 curve in Fig. 22 is the total efficiency curve of the system of the antenna system 20 shown in Fig. 21 when it is working, held by a hand, and in one state of the adjustment unit being disconnected; the D4 curve in Fig. 22 is the radiation efficiency curve of the antenna system 20 shown in Fig. 21 when it is working, held by a hand, and in one state of the adjustment unit being connected; the D5 curve in Fig. 22 is the total efficiency curve of the system of the antenna system 20 shown in Fig. 21 when it is working, held by a hand, and in one state of the adjustment unit being connected. In combination of Figs. 21 and 22, taking the case of the second feed structure 24 receiving the feed and the first feed structure 23 not receiving the feed as an example, when the surrounding environment of the antenna system 20 changes, for example, a human body approaches the gap 26, and thus the second resonance of the second radiator 221 is reduced, the adjustment unit 25 can be in the connected state and connect the first radiator 211 and the second radiator 221. At this time, the first radiator 211 can participate in the tuning of the antenna together with the second radiator 221 and generate the fourth resonance, so as to improve the radiation efficiency of the antenna system 20 and the total efficiency of the system, as shown by the comparison of the D5 curve and the C5 curve.

[0149] Figure 23 is a schematic diagram of the terminal device 100 being held in one case, in combination with Figures 21 and 23, in one embodiment, when the second antenna 22 of the antenna system 20 is in the working state, the first radiating body 211 is in the non-working state, the surrounding environment of the antenna system 20 changes and causes the antenna performance to decrease, for example, the slot 26 is held by hand, the adjusting unit 25 is turned on, at this time, the current distribution of the antenna system 20 at a certain time at the working frequency of 0.84 GHz has three current large points and one current zero point, the first current large point is located between the second radiating body 221, i.e., the first grounding point A and the first open end B, which is because the feeding received by the first feeding structure 23 directly acts on the second radiating body 221; the second current large point is located between the slot 26, i.e., the first open end B and the second open end C, which is because the adjusting unit 25 connected across the first open end B and the second open end C is turned on, and the current on the second radiating body 221 passes through the adjusting unit 25 connected across the slot 26; the third current large point is located between the first radiating body 211, i.e., the second open end C and the third open end D, which is because the second radiating body 221 is connected with the first radiating body 211 through the adjusting unit 25, and the first radiating body 211 has a current distribution. The current zero point is located between the slot 27, i.e., the third open end D and the fourth open end E.

[0150] In combination with Figures 21 and 23, in one embodiment, when the second antenna 22 of the antenna system 20 is in the working state, the first antenna 21 is in the non-working state, the surrounding environment of the antenna system 20 changes and causes the antenna performance to decrease, for example, the slot 26 is held by hand, the adjusting unit 25 is turned on, at this time, the electric field distribution of the antenna system 20 at a certain time at the working frequency of 0.84 GHz has one electric field large point. The electric field large point is located at the middle position of the first radiating body 211, i.e., between the third open end D and the fourth open end E, which is because the adjusting unit 25 connected across the first open end B and the second open end C is turned on, the tangential electric field of the slot 26 at this position is weakened due to being held by hand, the electric field distribution of the whole antenna system 20 changes, and the electric field strong point of the whole antenna system 20 is mainly on the first radiating body 211. The second radiating body 221, the slot 26, the first radiating body 211 and the slot 27 as a whole radiating body can radiate through the openings of the first radiating body 211, i.e., the third open end D and the fourth open end, and finally can improve the radiation efficiency of the antenna system 20 which is decreased after being held by hand. In contrast, the antenna system 20 when the adjusting unit 25 is in the off state does not have an electric field strong point after being held by hand. The tangential electric field of the slot 26 is weakened due to being held by hand, and because the first antenna 21 is in the non-working state and is not connected with the second antenna 22, the electric field intensity of the first antenna 21 is weak, the first antenna 21 cannot participate in the tuning of the antenna together with the second antenna 22, and thus cannot improve the radiation efficiency of the antenna system 20.

[0151] Figure 24 is a schematic diagram of the terminal device 100 according to an embodiment of the present application. Referring to Figure 24, in an embodiment, the antenna system 20 comprises the first antenna 21, the second antenna 22 and the adjusting unit 25. In comparison with the extension direction of the first radiator 211 of the antenna system 20 shown in Figure 9 which is the extension direction of the extension line of the first radiator 211, the first radiator 211 in this embodiment can be in an arc extension shape, for example, the third radiator 213 is located at the position where the two adjacent sides of the terminal device 100 intersect, and when the first radiator 211 comprises an arc extension structure, the extension direction of the first radiator 211 can be the extension direction of the first radiator 211 on the frame of the terminal device 100. In this embodiment, the frame 102 of the terminal device 100 comprises a first side 1021, a bottom side 1022 and a second side 1023, the second radiator 221 of the second antenna 22 is arranged along the AGB path, and the first radiator 211 and the third radiator 213 of the first antenna 21 are arranged along the CDEF path. It can be seen that a part of the second radiator 221 is located at the first side 1021, and another part of the second radiator 221 is located at the bottom side 1022; the first radiator 211 is located at the bottom side 1022, and a part of the third radiator 213 is located at the bottom side 1022, and another part of the third radiator 213 is located at the second side 1023. In an embodiment, when the second antenna 22 is working and the first antenna 21 is not working, the adjusting unit 25 is turned on, the second radiator 221 arranged along the AGBCD path, the slot 26 and the first radiator 211 are regarded as a unified radiator, and a fourth resonance is generated, which is jointly adjusted by the first device 212 and the second device 222. The use of the solution of the present application in the antenna system located at different positions of the terminal device can achieve the use of the radiator of the non-working state system, and thus the performance of the antenna system which is reduced due to the change of the surrounding environment can be improved.

[0152] Figure 25 is a schematic diagram of a terminal device 100 according to an embodiment of the present application. Referring to Figure 25, in an embodiment, the second radiator 221 and the fourth radiator 223 are the radiators of the second antenna 22, which can be a cellular low-frequency antenna, and the second antenna 22 is arranged along the ABCD path. The number of the second devices 222 can be two, and the two second devices 222 can be used together to tune the second antenna 22 to work independently. In an embodiment, one second device 222 can also be arranged to tune the second antenna 22. The first radiator 211 and the slot 27 can be used together to generate the first resonance, and the first antenna 21 can be a radiator of a WiFi antenna, which is arranged along the EF path, and no device is arranged on the first antenna 21 to tune it. In an embodiment, when it is identified that the second antenna 22 does not work, and the slot 27 is held by a hand to change the impedance of the first radiator 211, the adjustment unit 25 connected across AE is turned on, and the second device 222 is used to optimize the impedance of the first antenna 21. The second radiator 221 is also used to change the electric field distribution of the antenna system 20, so that the second radiator 221 and the first radiator 211 generate the third resonance together under the excitation of the feed received by the first feed structure 23, thereby improving the radiation efficiency of the antenna system 20. In an embodiment, when it is identified that the first antenna 21 does not work, and the slot 26 is held by a hand to change the impedance of the second radiator 221, the adjustment unit 25 connected across AE is turned on, and the first radiator 211 is used to change the electric field distribution of the antenna system 20, so that the first radiator 211 and the second radiator 221 generate the fourth resonance together under the excitation of the feed received by the second feed structure 24, thereby improving the radiation efficiency of the antenna system 20.

[0153] Figure 26 is a schematic diagram of a terminal device 100 according to an embodiment of the present application. Referring to Figure 26 in combination with Figure 1B, in an embodiment, the terminal device includes a first body 1, a second body 2, and a hinge 3, which is located between the first body 1 and the second body 2 to enable the first body 1 and the second body 2 to be folded or unfolded relative to each other. The frame 102 of the terminal device 100 includes a first side 1021 and a third side 1024, and the first side 1021 can be located on the first body 1 and the third side 1024 can be located on the second body 2. As shown in Figure 26, when the terminal device is in a folded state, the first side 1021 and the third side 1024 are relatively close to each other, and they can be in contact with each other or have a gap therebetween. The antenna system 20 includes a main antenna system and a parasitic antenna system, and the main antenna system can be arranged on the first side 1021 of the first body 1, and the parasitic antenna system can be arranged on the third side 1024 of the second body 2. In the folded state, the main antenna system can excite the parasitic antenna system to generate resonance, thereby improving the performance of the antenna system.

[0154] Referring to Fig. 26, in one embodiment, the main antenna system comprises a first antenna 21, a second antenna 22, a first feeding structure 23, a second feeding structure 24 and an adjusting unit 25. The first feeding structure 23 is electrically connected to the first radiator 211 and is configured to receive a feeding signal. The second feeding structure 24 is electrically connected to the second radiator 221 and is configured to receive a feeding signal. The first antenna 21 comprises the first radiator 211 and a first device 212, in one embodiment, the first device 212 is electrically connected between the first radiator 211 and the ground and is configured to tune the impedance or resonance of the first radiator 211. The second antenna 22 comprises the second radiator 221 and a second device 222, in one embodiment, the second device 222 is electrically connected between the second radiator 221 and the ground and is configured to tune the impedance or resonance of the second radiator 221. The first radiator 211 and the second radiator 221 have a gap 26 therebetween. In one embodiment, the main antenna system further comprises a third radiator 213, the third radiator 213 is located on a side of the first radiator 211 away from the gap 26, and the third radiator 213 and the first radiator 211 have a gap 27 therebetween. In one embodiment, the adjusting unit 25 is electrically connected between the first radiator 211 and the second radiator 221. In one embodiment, the adjusting unit 25 is connected between the first device 212 and the second radiator 221. In other embodiments, the adjusting unit 25 can also be connected between the first device 212 and the second device 222, or the adjusting unit can be connected between the first radiator 211 and the second device 222. The first radiator 211 and the second radiator 221 are arranged on the first side edge 1021 of the first main body 1, and the first radiator 211 and the second radiator 221 can be main radiators of the antenna system 20.

[0155] Referring to Fig. 26, in one embodiment, the parasitic antenna system comprises a first parasitic radiator 216, a second parasitic radiator 225 and a parasitic adjusting unit 25A. The first parasitic radiator 216 and the second parasitic radiator 225 are arranged on the third side edge 1024 of the second main body 2, and the first parasitic radiator 216 and the second parasitic radiator 225 have a gap 31 therebetween, and the first parasitic radiator 216 and the second parasitic radiator 225 can be parasitic radiators of the antenna system 20. When the terminal device is in the folded state, in the thickness direction of the terminal device, the first parasitic radiator 216 and the first radiator 211 are arranged opposite to each other, the second parasitic radiator 225 and the second radiator 221 are arranged opposite to each other, and the gap 31 between the first parasitic radiator 216 and the second parasitic radiator 225 is opposite to the gap 26 between the first radiator 211 and the second radiator 221.

[0156] In one embodiment, the parasitic adjustment unit 25A has a conducting state and a non-conducting state, and is connected between the first parasitic antenna 28 and the second parasitic antenna 29. In one embodiment, the parasitic adjustment unit 25A is used to be in the conducting state when the adjustment unit 25 is in the conducting state, so as to realize electrical conduction between the first parasitic antenna 28 and the second parasitic antenna 29, and the parasitic adjustment unit 25A is used to be in the non-conducting state when the adjustment unit 25 is in the non-conducting state, so as to realize electrical non-conduction between the first parasitic antenna 28 and the second parasitic antenna 29.

[0157] Referring to FIG. 26, in one embodiment, the first radiator 211 is a main branch of the first antenna 21 and is located at the first side 1021, and the at least two first devices 212 are electrically connected to the first radiator 211 and are used for tuning of the frequency band of the first antenna 21; the first parasitic antenna 28 comprises a first parasitic radiator 216 and a fourth device 214, the first parasitic radiator 216 is a parasitic radiator of the first antenna 21 and is located at the third side 1024, and the fourth device 214 is electrically connected to the third radiator 213 and is used for tuning of the frequency band of the first antenna 21. The second radiator 221 is a main branch of the second antenna 22 and is located at the first side 1021, and the second device 222 is electrically connected to the second radiator 221 and is used for tuning of the frequency band of the second antenna 22; the first parasitic antenna 28 comprises a second parasitic radiator 225 and a third device 224, the second parasitic radiator 225 is a parasitic radiator of the second antenna 22 and is located at the third side 1024, and the third device 224 is electrically connected to the second parasitic radiator 225 and is used for tuning of the frequency band of the second antenna 22. The adjustment unit 25 connecting the first radiator 211 and the second radiator 221 can be a separate device, or can be located on a branch of the first device 212 or on a branch of the second device 222. The parasitic adjustment unit 25A connecting the second parasitic radiator 225 and the first parasitic radiator 216 can be a separate device, or can be located on a branch of the third device 224. In one embodiment, when the second antenna 22 is working, the performance of the antenna system 20 is reduced due to changes in the surrounding environment, and at the same time the first antenna 21 is not working, the adjustment unit 25 can be in the conducting state and connected to the first antenna 21 and the second antenna 22, and the parasitic adjustment unit 25A can be in the conducting state and connected to the first parasitic antenna 28 and the second parasitic antenna 29. At this time, the second parasitic antenna 29 and the second antenna 22 can participate in the tuning of the antenna, the first antenna 21, the first parasitic antenna 28, the second antenna 22 and the second parasitic antenna 29 can jointly tune the antenna system 20, and the first device 212, the second device 222, the third device 224 and the fourth device 214 can jointly debug the impedance of the antenna system 20, thereby improving the radiation efficiency of the antenna system 20.

[0158] The scheme of the present application is not only applicable to multi-system antennas, but also can be used in single-system antennas. FIG. 27 is a schematic diagram of an antenna system 20 of a terminal device 100 according to an embodiment of the present application. As shown in FIG. 27, in an embodiment, the antenna system 20 includes a first radiator 211, a second radiator 221, a feeding structure 33, and an adjusting unit 25. The antenna system 20 can be a slot antenna. The first radiator 211 and the second radiator 221 are arranged on the frame 102 of the terminal device 100, and a gap 26 is formed between the first radiator 211 and the second radiator 221. The feeding structure 33 is electrically connected to the first radiator 211 or the second radiator 221 and is used for receiving a feeding. The adjusting unit 25 is connected between the first radiator 211 and the second radiator 221. The adjusting unit 25 has a conducting state and a non-conducting state. In the non-conducting state, the adjusting unit 25 realizes electrical disconnection between the first radiator 211 and the second radiator 221, so that the first radiator 211 and the second radiator 221 are excited to generate a first resonant mode and a second resonant mode. In the conducting state, the adjusting unit 25 realizes electrical connection between the first radiator 211 and the second radiator 221, so that the first radiator 211 and the second radiator 221 are excited to generate a third resonant mode. The third resonant mode has the same current distribution as the second resonant mode, and the third resonant mode covers the working frequency band of the second resonant mode.

[0159] As shown in FIG. 27, in an embodiment, the antenna system 20 has a first resonant mode and a second resonant mode in a normal working state. The antenna system is a slot antenna architecture, and in the non-conducting state of the adjusting unit 25, the antenna has a dual-mode, which is a C-mode and a D-mode, respectively. The first resonant mode can be a C-mode of the slot antenna, and the second resonant mode can be a D-mode of the slot antenna. In an embodiment, in the first resonant mode, the current direction on the first radiator 211 is opposite to the current direction on the second radiator 221. In the second resonant mode, the current direction on the first radiator 211 is the same as the current direction on the second radiator 221. The third resonant mode is also a D-mode.

[0160] As shown in FIG. 27, in an embodiment, the antenna system 20 further includes a fifth device 321 connected to the first radiator 211 or the second radiator 221 and used for tuning the working frequency band of the first radiator 211 or the second radiator 221. In an embodiment, the number of the fifth devices 321 is at least two. The at least two fifth devices 321 can be electrically connected to the first radiator 211 and the second radiator 221, respectively. The at least two fifth devices 321 can be used for adjusting the working frequency bands of the first resonant mode and the second resonant mode in the non-conducting state of the adjusting unit 25 and adjusting the third resonant mode in the conducting state of the adjusting unit 25.

[0161] Fig. 28 is a plot of return loss curves of the antenna system 20 in some cases shown in Fig. 27, referring to Fig. 28, the A6 curve in Fig. 28 is the return loss S22 curve of the antenna system 20 shown in Fig. 27 when operating and in free space; the C6 curve in Fig. 28 is the return loss S22 curve of the antenna system 20 shown in Fig. 27 when operating and being held by a hand and being debugged by a device; the D6 curve in Fig. 28 is the return loss S22 curve of the antenna system 20 shown in Fig. 27 when operating and being held by a hand, the adjusting unit 25 being turned on and being debugged by a device. Fig. 29 is a plot of total efficiency and radiation efficiency curves of the antenna system 20 in some cases shown in Fig. 27, referring to Fig. 29, the A7 curve in Fig. 29 is the radiation efficiency curve of the antenna system 20 shown in Fig. 27 when operating and in free space; the A8 curve in Fig. 29 is the total efficiency curve of the system of the antenna system 20 shown in Fig. 27 when operating and in free space; the C7 curve in Fig. 29 is the radiation efficiency curve of the antenna system 20 shown in Fig. 27 when operating and being held by a hand, the adjusting unit 25 being turned off and being debugged by a device; the C8 curve in Fig. 29 is the total efficiency curve of the system of the antenna system 20 shown in Fig. 27 when operating and being held by a hand, the adjusting unit 25 being turned off and being debugged by a device; the D7 curve in Fig. 29 is the radiation efficiency curve of the antenna system 20 shown in Fig. 27 when operating and being held by a hand, the adjusting unit 25 being turned on and being debugged by a device; the D8 curve in Fig. 29 is the total efficiency curve of the system of the antenna system 20 shown in Fig. 27 when operating and being held by a hand, the adjusting unit 25 being turned on and being debugged by a device.

[0162] In combination with Fig. 27 and Fig. 28, when the slot 26 is held by a hand, the frequencies corresponding to the return loss peak points of the first resonant mode and the second resonant mode change, i.e. the return loss curve is frequency-shifted. At this time, since the adjusting unit is in the off state, the first radiator 211 and the second radiator 221 still generate the first resonant mode and the second resonant mode under the excitation of the feed structure 33, as shown by the comparison of the C6 curve and the A6 curve. After the slot 26 is held by a hand and the adjusting unit 25 is in the on state, the first radiator 211 and the second radiator 221 are connected, at this time, the first radiator 211 and the second radiator 221 no longer generate the first resonant mode and the second resonant mode, but generate the third resonant mode together, as shown by the comparison of the D6 curve and the C6 curve, the A6 curve. The third resonant mode is similar to the second resonant mode.

[0163] In combination with FIG. 27 and FIG. 29, when the slot 26 of the antenna system 20 is held by the hand, the radiation efficiency of the antenna system 20 and the total efficiency of the system are obviously decreased, as shown by the comparison between the A7 curve and the C7 curve, and the comparison between the A8 curve and the C8 curve. After the slot 26 is held by the hand and the adjusting unit 25 is in the conducting state, the first radiator 211 and the second radiator 221 are in communication, and the conducting of the adjusting unit 25 causes the current distribution of the antenna system 20 to change, the first radiator 211 and the second radiator 221 together generate a third resonance mode, and the radiation efficiency of the antenna system 20 and the total efficiency of the system are improved, as shown by the comparison between the D7 curve and the C7 curve, and the comparison between the D8 curve and the C8 curve.

[0164] It should be understood that the magnitude of the sequence number of each process described above does not mean the order of execution, and the execution order of each process should be determined according to its function and inherent logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0165] The above description is merely specific embodiments of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical scope disclosed in the present application, which should be covered within the protection scope of the present application; in the case of no conflict, the possible embodiments of the present application and the features in the possible embodiments can be combined with each other. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. An antenna system, characterized by The antenna system comprises a first antenna and a second antenna, the first antenna comprises the first radiator and the first feed structure, the second antenna comprises the second radiator and the second feed structure, the first antenna and the second antenna are respectively used for different communication systems. The first antenna is a wifi antenna, and the second antenna is a cellular antenna. The adjusting unit comprises an adjustable device connected between the first radiator and the second radiator, the adjustable device has a conducting state and a non-conducting state, and the conducting state and the non-conducting state of the adjustable device are switched by changing a parameter of the adjustable device.

2. The antenna system of claim 1, wherein, The adjusting unit comprises a switching switch and a branch group connected in series between the first radiator and the second radiator, the branch group comprises a first branch and a second branch, the first branch is connected to the first radiator, the second branch is in a non-conducting state with the first radiator, the switching switch is in communication with the first branch in a first state to realize the electrical conduction between the first radiator and the second radiator, and the switching switch is in communication with the second branch in a second state to realize the electrical non-conduction between the first radiator and the second radiator.

3. The antenna system of claim 2, wherein, In the second state of the switching switch, the second branch is electrically connected between the second radiator and the ground, and the second branch is used for adjusting the working frequency band of the second resonance.

4. The antenna system of claim 1, wherein, The antenna system further comprises a first device electrically connected between the first radiator and the ground.

5. The antenna system of claim 1, wherein, ​ 6. The antenna system of claim 5, wherein, ​ 7. The antenna system of any of claims 1-6, wherein, ​ The first device is used for adjusting the operating frequency band of the first resonance when the adjusting unit is in the off state, and for adjusting the operating frequency band of the third resonance or the fourth resonance when the adjusting unit is in the on state.

8. The antenna system of claim 7, wherein, The number of the first devices is at least two, and the at least two first devices are arranged at different positions of the first radiator and are connected to the first radiator.

9. The antenna system of claim 7 or 8, characterized in that, Both ends of the first radiator are open ends.

10. The antenna system of any of claims 7-9, wherein, The antenna system further comprises a second device electrically connected between the second radiator and the ground, the second device being used for adjusting the operating frequency band of the second resonance when the adjusting unit is in the off state, and for adjusting the operating frequency band of the third resonance or the fourth resonance when the adjusting unit is in the on state.

11. The antenna system of claim 10, wherein, One end of the second radiator adjacent to the first radiator is an open end, and the other end of the second radiator away from the first radiator is a grounded end.

12. The antenna system of claim 10 or 11, characterized in that, The antenna system further comprises a third radiator, the first radiator being located between the second radiator and the third radiator, a gap being formed between the third radiator and the first radiator, and one end of the third radiator away from the gap being grounded.

13. The antenna system of any of claims 1-12, wherein, The antenna system comprises a first parasitic radiator, a second parasitic radiator and a parasitic adjusting unit, the first parasitic radiator and the second parasitic radiator having a gap therebetween, the first parasitic radiator being arranged opposite to the first radiator, the second parasitic radiator being arranged opposite to the second radiator, the gap between the first parasitic radiator and the second parasitic radiator being opposite to the gap between the first radiator and the second radiator, the parasitic adjusting unit having on and off states, the parasitic adjusting unit being connected between the first parasitic radiator and the second parasitic radiator, the parasitic adjusting unit being used for being in the on state when the adjusting unit is in the on state to realize electrical conduction between the first parasitic radiator and the second parasitic radiator, and the parasitic adjusting unit being used for being in the off state when the adjusting unit is in the off state to realize electrical disconnection between the first parasitic radiator and the second parasitic radiator.

14. An antenna system, characterized by The antenna system comprises a first parasitic radiator, a second parasitic radiator and a parasitic adjusting unit, the first parasitic radiator and the second parasitic radiator having a gap therebetween, the first parasitic radiator being arranged opposite to the first radiator, the second parasitic radiator being arranged opposite to the second radiator, the gap between the first parasitic radiator and the second parasitic radiator being opposite to the gap between the first radiator and the second radiator, the parasitic adjusting unit having on and off states, the parasitic adjusting unit being connected between the first parasitic radiator and the second parasitic radiator, the parasitic adjusting unit being used for being in the on state when the adjusting unit is in the on state to realize electrical conduction between the first parasitic radiator and the second parasitic radiator, and the parasitic adjusting unit being used for being in the off state when the adjusting unit is in the off state to realize electrical disconnection between the first parasitic radiator and the second parasitic radiator.

15. The antenna system of claim 14, wherein, In the first resonant mode, the currents on the first radiator and the second radiator are opposite, in the second resonant mode, the currents on the first radiator and the second radiator are same, and in the third resonant mode, the currents on the first radiator and the second radiator are same.

16. The antenna system of claim 14, wherein, The antenna system further comprises a fifth device connected to the first radiator and the second radiator, and used for tuning the operating frequency range of the third resonant mode when the tuning unit is in the on state.

17. A terminal device, comprising: The terminal device comprises a control system, which is used for controlling the adjusting unit to be in the on state when the first feeding structure receives feeding and the second feeding structure does not receive feeding, or controlling the adjusting unit to be in the on state when the second feeding structure receives feeding and the first feeding structure does not receive feeding.

18. The terminal device of claim 17, wherein, The terminal device comprises a control system, which is used for controlling the adjusting unit to be in the on state when the first feeding structure receives feeding and the second feeding structure does not receive feeding, or controlling the adjusting unit to be in the on state when the second feeding structure receives feeding and the first feeding structure does not receive feeding.

19. The terminal device of claim 17, wherein, The terminal device comprises a control system, which is used for controlling the adjusting unit to be in the on state when the first feeding structure receives feeding and the second feeding structure does not receive feeding, or controlling the adjusting unit to be in the on state when the second feeding structure receives feeding and the first feeding structure does not receive feeding.

20. The terminal device of claim 17, wherein, The terminal device comprises a control system, which is used for controlling the adjusting unit to be in the on state when the first feeding structure receives feeding and the second feeding structure does not receive feeding, or controlling the adjusting unit to be in the on state when the second feeding structure receives feeding and the first feeding structure does not receive feeding. The terminal device comprises a control system, which is used for controlling the adjusting unit to be in the on state when the first feeding structure receives feeding and the second feeding structure does not receive feeding, or controlling the adjusting unit to be in the on state when the second feeding structure receives feeding and the first feeding structure does not receive feeding.

Images