Communication terminal

Abstract

The present application provides a communication terminal. The communication terminal comprises a radio frequency chip, a first main radiator, a second main radiator, and a feed structure. The first main radiator, the second main radiator, and the feed structure are pairwise parallel and spaced apart, and the orthographic projection of the first main radiator on a first plane and the orthographic projection of the second main radiator on the first plane at least partially overlap, so that the first main radiator and the second main radiator form an antenna of a parallel structure. The first plane is perpendicular to the arrangement direction of the first main radiator and the second main radiator. The feed structure is used for coupling and feeding the first main radiator and the second main radiator separately. The feed structure simultaneously feeds the first main radiator and the second main radiator, thereby improving the radiation efficiency of the first main radiator and the second main radiator in the antenna system, enhancing the communication effect of the antenna system, and improving the communication capability of the communication terminal.

Description

A communication terminal

[0001] Cross-reference to related applications

[0002] This application claims priority to the Chinese Patent Application No. 202410467525.X, filed on April 17, 2024, and entitled “A communication terminal”, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0003] The present application relates to the field of communication technology, and in particular to a communication terminal. BACKGROUND

[0004] With the rapid development of communication technology and the popularity of smart phones, people's demand for mobile terminals is getting higher and higher. In particular, the requirement for the communication capability of mobile terminals is also getting higher and higher. The communication capability of mobile terminals is realized through an antenna system, therefore, improving the performance of the antenna system of mobile terminals is an important development direction in the field.

[0005] At present, one antenna in the antenna system of a mobile terminal can include multiple radiators. In one scheme, the multiple radiators can be arranged in series along the extension direction of the radiators to form a series structure. In one scheme, the multiple radiators can be arranged in parallel to form a parallel structure. The antenna with the parallel structure can reduce the space occupied by the antenna, which is conducive to improving the integration and miniaturization of the mobile terminal. However, the radiation efficiency of the parallel structure is difficult to improve, and the communication performance needs to be further improved. SUMMARY

[0006] The present application provides a communication terminal, which includes an antenna system with a parallel structure, and the first main radiator and the second main radiator of the antenna system have good radiation efficiency, and the communication terminal has strong communication capability.

[0007] The communication terminal provided in the application comprises a radio frequency chip, a first main radiator, a second main radiator and a feeding structure. The first main radiator, the second main radiator and the feeding structure are arranged in parallel and are spaced apart from each other. The first main radiator and the second main radiator are at least partially overlapped in the projection of the first main radiator on a first plane and the projection of the second main radiator on the first plane, so that the first main radiator and the second main radiator form an antenna with a parallel structure. The first plane is perpendicular to the arrangement direction of the first main radiator and the second main radiator, that is, the first main radiator and the second main radiator are at least partially overlapped in the arrangement direction. The feeding structure is connected with the radio frequency chip. The feeding structure is used for coupling and feeding the first main radiator and the second main radiator respectively. The shortest distance S1 between the feeding structure and the first main radiator and the shortest distance S2 between the feeding structure and the second main radiator satisfy: -30% S1≤S1-S2≤30% S1. The feeding structure and the first main radiator are coupled and connected, and the feeding structure and the second main radiator are coupled and connected, so that the feeding structure can feed the first main radiator and the second main radiator at the same time. The radiation efficiency of the first main radiator and the second main radiator with a parallel structure in the antenna system is improved, the communication effect of the antenna system is improved, and the communication capability of the communication terminal is improved.

[0008] In the specific technical solution, the shortest distance S1 between the feeding structure and the first main radiator and the shortest distance S2 between the feeding structure and the second main radiator satisfy: S1=S2. In this solution, the feeding structure can feed the first main radiator and the second main radiator symmetrically, so as to realize symmetric feeding and improve the radiation efficiency of the antenna system.

[0009] When the antenna system is specifically arranged, various specific solutions can be used. For example, the feeding structure, the first main radiator and the second main radiator can be arranged on the same plane. This solution is beneficial to the arrangement of the feeding structure, the first main radiator and the second main radiator. The feeding structure is arranged between the first main radiator and the second main radiator, and the distance between the feeding structure and the first main radiator and the second main radiator can be the same or close to the same, so as to be beneficial to the realization of symmetric feeding.

[0010] In the arrangement direction of the first main radiator, one end of the feeding structure is located between the two ends of the first main radiator. One side of the feeding structure is coupled and connected with the first main radiator, and the other side of the feeding structure is coupled and connected with the second main radiator. By adjusting the specific position of one end of the feeding structure in the arrangement direction of the first main radiator between the two ends of the first main radiator, the coupling area of the feeding structure with the first main radiator and the coupling area of the feeding structure with the second main radiator can be adjusted, so as to adjust the feeding effect, thereby being beneficial to the adjustment of the specific size and shape of each part of the antenna system according to the requirements.

[0011] In a technical solution, a gap is provided between the feed structure and the first main radiator along the extension direction of the first main radiator. In the technical solution, the first main radiator and the feed structure are arranged along the extension direction of the first main radiator, so that the first main radiator and the feed structure are located in the same component of the communication terminal, for example, the first main radiator and the feed structure are located in the frame of the communication terminal.

[0012] In order to improve the feed coupling of the antenna system, the electrical length of the first main radiator and the electrical length of the second main radiator satisfy: In the technical solution, the first main radiator and the second main radiator are both radiators with an electrical length of 1 / 2 of the medium wavelength or both are radiators with an electrical length of 1 / 4 of the medium wavelength, so that the electrical lengths of the two main radiators are relatively close, which is beneficial to improve the feed symmetry.

[0013] In a technical solution, the first main radiator is a radiator with an electrical length of 1 / 2 of the medium wavelength, and the second main radiator is a radiator with an electrical length of 1 / 4 of the medium wavelength, so that If the first main radiator is a radiator with an electrical length of 1 / 4 of the medium wavelength, and the second main radiator is a radiator with an electrical length of 1 / 2 of the medium wavelength, so that This solution can also improve the feed symmetry of the antenna system.

[0014] In the physical structure, the first main radiator and the second main radiator are both radiators with an electrical length of 1 / 2 of the medium wavelength or both are radiators with an electrical length of 1 / 4 of the medium wavelength, so that the length L1 of the first main radiator 32 and the length L2 of the second main radiator 33 satisfy: -20% L1≤L1-L2≤20% L1. The length of the first main radiator 32 and the length of the second main radiator 33 differ by no more than 20%, and both can be considered as the parallel structure antenna of the embodiment of the application, which is beneficial to make the antenna system have a better communication effect. If the first main radiator 32 is a radiator with an electrical length of 1 / 2 of the medium wavelength, and the second main radiator 33 is a radiator with an electrical length of 1 / 4 of the medium wavelength, so that -20% L2≤1 / 2*L1-L2≤20% L2. If the first main radiator 32 is a radiator with an electrical length of 1 / 4 of the medium wavelength, and the second main radiator 33 is a radiator with an electrical length of 1 / 2 of the medium wavelength, so that -20% L1≤L1-1 / 2*L2≤20% L1. This solution can also improve the feed symmetry of the antenna system.

[0015] The feeding structure in the embodiments of the present application has multiple choices. For example, the electric length of the feeding structure is 1 / 2 of the dielectric wavelength, and both ends of the feeding structure are open ends. Alternatively, the electric length of the feeding structure is 1 / 4 of the dielectric wavelength, and one end of the feeding structure is an open end and the other end is a grounded end. The dielectric wavelength is the dielectric wavelength corresponding to the frequency in the working frequency band of the feeding structure. The specific structure of the feeding structure can be selected and designed according to the structure and layout of the communication terminal and the requirements of the communication capability of the antenna system.

[0016] Similarly, the specific structure of the first main radiator and the second main radiator in the embodiments of the present application can have multiple choices and combinations. For example, the first main radiator and the second main radiator both include only one linear main branch, the electric length of the first main radiator is 1 / 2 of the dielectric wavelength, and the electric length of the second main radiator is 1 / 2 of the dielectric wavelength; alternatively, the electric length of the first main radiator is 1 / 4 of the dielectric wavelength, and the electric length of the second main radiator is 1 / 4 of the dielectric wavelength; alternatively, the electric length of the first main radiator is 1 / 2 of the dielectric wavelength, and the electric length of the second main radiator is 1 / 4 of the dielectric wavelength; the dielectric wavelength is the dielectric wavelength corresponding to the frequency in the working frequency band of the feeding structure.

[0017] In a specific technical solution, the first main radiator includes a first sub-radiator and a second sub-radiator, and the first sub-radiator and the second sub-radiator have a gap therebetween, one end of the first sub-radiator away from the gap is grounded, and one end of the second sub-radiator away from the gap is grounded.

[0018] Similarly, the second main radiator includes a third sub-radiator and a fourth sub-radiator, and the third sub-radiator and the fourth sub-radiator have a gap therebetween, one end of the third sub-radiator away from the gap is grounded, and one end of the fourth sub-radiator away from the gap is grounded.

[0019] The specific structure of the first main radiator and the second main radiator can be selected and designed according to the structure and layout of the communication terminal and the requirements of the communication capability of the antenna system.

[0020] The position of the feeding structure can be set such that the feeding structure includes at least one of a conductive structure arranged on an insulating support or an insulating back cover, a part of a conductive structure of a frame, and a microstrip line on a circuit board. The specific design can be made according to requirements.

[0021] Similarly, the first main radiator and the second main radiator can also respectively include at least one of a conductive structure arranged on an insulating support or an insulating back cover, a partial conductive structure of a frame, and a microstrip line on a circuit board. The first main radiator and the second main radiator can be arranged at the same position or different positions. For example, the first main radiator and the second main radiator can include a conductive structure arranged on an insulating support, or the first main radiator includes a conductive structure arranged on an insulating back cover, and the second main radiator includes a partial conductive structure of a frame.

[0022] The feeding structure simultaneously feeds the first main radiator and the second main radiator, so that the feeding structure is in the same direction in the current direction excited by the first main radiator and in the current direction excited by the second main radiator. Thus, the radiation efficiency of the antenna system is improved, and the communication capability of the communication terminal is improved.

[0023] The communication terminal can also be a foldable mobile terminal. Specifically, the communication terminal further includes a first housing, a second housing, and a first rotating shaft. The first housing and the second housing can be folded or unfolded relative to the first rotating shaft, thereby realizing folding and unfolding of the communication terminal. The first main radiator is located in the first housing, and the second main radiator is located in the second housing. When the first housing and the second housing are in a folded state, the arrangement direction is the thickness direction of the communication terminal. This scheme can make the antenna system of the foldable mobile terminal in a folded state into a parallel structure, and the parallel structure is symmetrically fed by the feeding structure, so that the foldable mobile terminal also has good communication capability in the folded state.

[0024] In a specific technical solution, the radio frequency chip and the feeding structure are arranged in the first housing. The distance between the feeding structure and the radio frequency chip is short, the loss on the signal transmission path is reduced, and the signal transmission quality of the communication system is improved.

[0025] Since the feeding structure and the first main radiator are arranged in the first housing, the distance between the feeding structure and the first main radiator is close, and the distance between the feeding structure and the second main radiator is far. Therefore, the length of the second main radiator is less than the length of the first main radiator. Thus, the intensity of the coupling current formed by the first main radiator and the intensity of the coupling current formed by the second main radiator are close, forming a symmetrically fed antenna structure, which is beneficial to improving the radiation efficiency of the parallel structure antenna.

[0026] When the first main radiator and the second main radiator are arranged, the first main radiator can be a partial conductive structure of a frame of the first housing, and the second main radiator can be a partial conductive structure of a frame of the second housing. This scheme is beneficial to multiplexing the first housing and the second housing of the communication terminal, does not occupy the space inside the first housing and the second housing, and is beneficial to improving the integration of the communication terminal.

[0027] Further, the feeding structure is part of the conductive structure of the frame of the first shell. Similarly, the feeding structure in this scheme also reuses the first shell, which is conducive to improving the integration of the communication terminal.

[0028] When the first main radiator and the feeding structure are both located at the frame of the first shell, the feeding structure and the first main radiator have a first gap therebetween, and the width of the first gap is less than or equal to 2 mm. Thus, the feeding structure and the first main radiator arranged in sequence can also have a good coupling effect, thereby improving the communication capability of the antenna system.

[0029] In another technical scheme, the feeding structure is arranged in the first shell, and the feeding structure and the first main radiator have a second gap therebetween along a third direction, and the width s of the second gap satisfies: when the working frequency band of the first main radiator is located in 0.6 GHz-1.6 GHz, 0.15 mm≤s≤5 mm; when the working frequency band of the first main radiator is located in 1.6 GHz-6 GHz, 0.3 mm≤s≤7 mm; and the third direction is perpendicular to the arrangement direction and the extension direction of the first main radiator. The feeding structure satisfying the above condition is conducive to effectively feeding the first main radiator and the second main radiator, thereby improving the feeding effect and the communication capability of the antenna system.

[0030] In a further technical scheme, the communication terminal can further include a three-fold foldable mobile terminal. The communication terminal further includes a second rotating shaft and a third shell, wherein: the first shell, the first rotating shaft, the third shell, the second rotating shaft, and the second shell are connected in sequence; and the feeding structure is located in the third shell. This scheme is conducive to symmetrically arranging the first main radiator and the second main radiator on both sides of the feeding structure to realize symmetric feeding.

[0031] The feeding structure can be part of the conductive structure of the frame of the third shell. Using part of the conductive structure of the third shell as the feeding structure is conducive to reducing the space occupied by the antenna system and improving the integration of the communication terminal. BRIEF DESCRIPTION OF DRAWINGS

[0032] FIG. 1 is a structural schematic diagram of a communication terminal in an embodiment of the present application;

[0033] FIG. 2 is a structural schematic diagram of an antenna system of a communication terminal in an embodiment of the present application;

[0034] FIG. 3 is a structural schematic diagram of an antenna system in an embodiment of the present application;

[0035] FIG. 4 is a structural schematic diagram of a first main radiator in an embodiment of the present application;

[0036] FIG. 5 is a structural schematic diagram of a first main radiator in an embodiment of the present application;

[0037] Fig. 6 is a three-dimensional schematic view of a structure of an antenna system in an embodiment of the present application;

[0038] Fig. 7 is a side view of the antenna system in an embodiment of the present application along a second direction;

[0039] Fig. 8 is a side view of the antenna system in an embodiment of the present application along a second direction;

[0040] Fig. 9 is a side view of the antenna system in an embodiment of the present application along a second direction;

[0041] Fig. 10 is a schematic view of an architecture structure of the antenna system in an embodiment of the present application;

[0042] Fig. 11 is a schematic view of an architecture structure of the antenna system in an embodiment of the present application;

[0043] Fig. 12 is a schematic view of an architecture structure of the antenna system of a comparative example;

[0044] Fig. 13 is a schematic view of an architecture structure of the antenna system of a comparative example;

[0045] Fig. 14 is a comparison chart of return loss of the antenna system in the comparative example and the antenna system in the present application;

[0046] Fig. 15 is a comparison chart of system radiation efficiency of the antenna system in the comparative example and the antenna system in the present application;

[0047] Fig. 16 is a schematic view of an architecture structure of the antenna system in an embodiment of the present application;

[0048] Fig. 17 is a schematic view of an architecture structure of the antenna system in an embodiment of the present application;

[0049] Fig. 18 is a schematic view of an architecture structure of the antenna system in an embodiment of the present application;

[0050] Fig. 19 is a schematic view of an architecture structure of the antenna system in an embodiment of the present application;

[0051] Fig. 20 is a schematic view of an architecture structure of the antenna system in an embodiment of the present application;

[0052] Fig. 21 is a schematic view of an architecture structure of the antenna system in an embodiment of the present application;

[0053] Fig. 22 is a schematic view of an architecture structure of the antenna system in an embodiment of the present application;

[0054] Fig. 23 is a schematic view of an architecture structure of the antenna system in an embodiment of the present application;

[0055] Fig. 24 is a schematic view of an architecture structure of the antenna system in an embodiment of the present application;

[0056] FIG. 25 is an unfolded view of a communication terminal according to an embodiment of the present application;

[0057] FIG. 26 is an unfolded view of a communication terminal according to an embodiment of the present application;

[0058] FIG. 27 is a structural view of a communication terminal according to an embodiment of the present application;

[0059] FIG. 28 is a structural view of a communication terminal according to an embodiment of the present application;

[0060] FIG. 29 is a graph of return loss of an antenna system of a foldable mobile terminal according to an embodiment of the present application;

[0061] FIG. 30 is a graph of radiation efficiency of an antenna system of a foldable mobile terminal according to an embodiment of the present application;

[0062] FIG. 31 is a partial structural view of an antenna system of a foldable mobile terminal according to an embodiment of the present application;

[0063] FIG. 32 is a partial structural view of an antenna system of a foldable mobile terminal according to an embodiment of the present application;

[0064] FIG. 33 is a partial structural view of an antenna system of a foldable mobile terminal according to an embodiment of the present application;

[0065] FIG. 34 is a partial structural view of an antenna system of a foldable mobile terminal according to an embodiment of the present application;

[0066] FIG. 35 is a partial structural view of an antenna system of a foldable mobile terminal according to an embodiment of the present application;

[0067] FIG. 36 is a cross-sectional view of the antenna system of FIG. 28;

[0068] FIG. 37 is a lateral structural view of a communication terminal according to an embodiment of the present application.

[0069] Reference signs: 1 - housing; 100 - cover plate; 200 - display screen / module; 300 - printed circuit board; 400 - middle frame; 500 - back cover; 600 - frame; 11 - first housing; 12 - second housing; 13 - first rotating shaft; 14 - second rotating shaft; 15 - third housing; 31 - radio frequency chip; 32 - first main radiator; 321 - first sub-radiator; 322 - second sub-radiator; 33 - second main radiator; 331 - third sub-radiator; 332 - fourth sub-radiator; 34 - feeding structure; 35 - sub-branch; M - first plane; N - arrangement direction; X - first direction; Y - second direction; Z - third direction. DETAILED DESCRIPTION

[0070] In order to make the purposes, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the drawings.

[0071] The terms used in the following examples are for the purpose of describing particular embodiments only and are not intended to be limiting of the present application. As used in this specification and the appended claims, the singular forms "a," "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

[0072] Reference to "one embodiment" or "an embodiment" or "a specific embodiment" or "some embodiments" or "one specific embodiment" or "some specific embodiments" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the application. The appearances of the phrase "in one embodiment" or "in some embodiments" in various places in the specification are not necessarily all referring to the same embodiment.

[0073] The following explains the terms that can appear in the embodiments of the application.

[0074] Radiating element: is a device in an antenna that is used to receive / transmit electromagnetic wave radiation. In some cases, "antenna" is understood in a narrow sense as a radiating element that converts guided wave energy from a transmitter into radio waves, or converts radio waves into guided wave energy for radiation and reception of radio waves. The modulated high frequency current energy (or guided wave energy) produced by the transmitter is transmitted along the feed line to the transmitting radiating element, which converts it to some polarized electromagnetic wave energy and radiates it in the desired direction. The receiving radiating element converts some polarized electromagnetic wave energy from a particular direction in space into modulated high frequency current energy, which is delivered to the input of the receiver through the feed line.

[0075] Ground / ground plane: can refer to at least a portion of any ground layer, or ground plane, or ground metal layer, or any combination of the above in a communication terminal (such as a mobile phone), and can be used for grounding of components in the communication terminal. In one embodiment, the ground / ground plane can include any one or more of the following: a ground layer of a circuit board of the communication terminal, a ground plane formed by a frame of the communication terminal, a ground metal layer formed by a metal film under the screen, a conductive ground layer of the battery, and a conductive or metal member electrically connected to the above ground layer / ground plane / ground metal layer. In one embodiment, the circuit board can be a printed circuit board (PCB), such as an 8-layer, 10-layer, or 12- to 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.

[0076] Any ground layer, or ground plane, or ground metal layer described above can be made of a conductive material. In one embodiment, the conductive material can be any one of the following: copper, aluminum, stainless steel, brass and their alloys, copper foil on an insulating substrate, aluminum foil on an insulating substrate, gold foil on an insulating substrate, silver-plated copper, silver-plated copper foil on an insulating substrate, silver foil on an insulating substrate, and tin-plated copper, graphite powder impregnated cloth, graphite-coated substrate, copper-plated substrate, brass-plated substrate, and aluminum-plated substrate. Those skilled in the art will understand that the ground layer / ground plane / ground metal layer can also be made of other conductive materials.

[0077] RF chip: is the combination of all components of an antenna for the reception and transmission of radio waves. In the case of a receiving antenna, the RF chip can be considered as the antenna part from the first amplifier to the front-end transmitter. In a transmitting antenna, the RF chip can be seen as the part after the last power amplifier. In some cases, the RF chip can also be understood as the feed element. The RF chip has the function of converting radio waves into electrical signals and sending them to the receiver components. Usually, it is considered part of the antenna system for converting radio waves into electrical signals and vice versa. The antenna should be designed to consider the maximum power transmission possibility and efficiency. For this purpose, the antenna feed impedance must be matched to the load resistance. The antenna feed impedance is a combination of resistance, capacitance, and inductance. To ensure maximum power transmission conditions, the two impedances (load resistance and feed impedance) should be matched. The matching can be done by considering the frequency requirements and the design parameters of the antenna (such as gain, directivity, and radiation efficiency).

[0078] Feed line: also called transmission line, refers to the connection line between the RF chip of the antenna and the radiator. Transmission lines can directly transmit current waves or electromagnetic waves depending on the frequency and form. The connection between the radiator and the transmission line is usually called the feed 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 the implementation form. Transmission lines can be implemented by LCP (Liquid Crystal Polymer), FPC (Flexible Printed Circuit), or PCB (Printed Circuit Board) according to the carrier.

[0079] Communication frequency band / operating frequency band: no matter what type of antenna, it always works within a certain frequency range (bandwidth). For example, an antenna that supports the B40 frequency band has an operating frequency band that includes frequencies in the range of 2300MHz-2400MHz, or in other words, the operating frequency band of the antenna includes the B40 frequency band. The frequency range that meets the index requirements can be considered as the operating frequency band of the antenna. The width of the operating frequency band is called the operating bandwidth. The operating bandwidth of an omnidirectional antenna can reach 3-5% of the center frequency. The operating bandwidth of a directional antenna can reach 5-10% of the center frequency. The bandwidth can be considered as a range of frequencies on both sides of the center frequency (for example, the resonant frequency of a dipole), where the antenna characteristics are within an acceptable range of values at the center frequency.

[0080] The resonant frequency band and the operating frequency band can be the same or different, or their frequency ranges can partially overlap. In one embodiment, the resonant frequency band of an antenna can cover multiple operating frequency bands of the antenna.

[0081] Medium wavelength: refers to the wavelength of electromagnetic wave propagating in medium at the working frequency band. For example, the working frequency band is [f1, f2], and the corresponding medium wavelength is also a range value [w1, w2]. Alternatively, in order to simplify the calculation, the above medium wavelength can also refer to the wavelength of electromagnetic wave propagating in medium at the center frequency f0 of the working frequency band, at this time, the medium wavelength is a specific value w0.

[0082] 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 transmission power. The smaller the reflected signal, the greater the signal radiated through the antenna to the space, and the greater the radiation efficiency of the antenna. The greater the reflected signal, the smaller the signal radiated through the antenna to the space, and the smaller the radiation efficiency of the antenna.

[0083] The antenna return loss can be represented by the S11 parameter, which belongs to one of the S parameters. S11 represents the reflection coefficient, and this parameter can represent the advantages and disadvantages of the antenna transmission efficiency.

[0084] In one embodiment, the S11 graph can be understood as a schematic diagram for representing the resonance generated by the antenna. In one embodiment, the resonance shown in the S11 graph in the part less than -6dB can be understood as the resonance frequency / frequency range / working frequency band generated by the antenna. The S11 parameter is usually negative, and the smaller the S11 parameter, the smaller the antenna return loss, the smaller the energy reflected back by the antenna itself, that is, the more the energy actually entering the antenna, and the higher the radiation efficiency of the antenna; the larger the S11 parameter, the larger the antenna return loss, and the lower the radiation efficiency of the antenna.

[0085] It should be noted that the S11 value of -6dB is generally used as a standard in engineering, 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.

[0086] Radiation efficiency: refers to the ratio of the power radiated by the antenna to the space (i.e. the power of the part effectively converted into electromagnetic wave) to the active power input to the antenna. Among them, the active power input to the antenna = input power of the antenna - loss power; the loss power mainly includes the return loss power and the ohmic loss power of the metal and / or the dielectric loss power. Metal loss, dielectric loss are the influencing factors of radiation efficiency.

[0087] Those skilled in the art can understand that the radiation efficiency is generally expressed in percentage, and there is a corresponding conversion relationship between it and dB, and the closer the radiation efficiency is to 0dB, the better the radiation efficiency of the antenna is represented.

[0088] dB: decibel, a logarithmic concept with base 10. Decibel is only used to evaluate the ratio between two physical quantities, and it has no physical dimension. The ratio between two quantities increases by 10 times, and the difference between them can be expressed as 10 decibels. For example: A = "100", B = "10", C = "5", D = "1", then A / D = 20 dB; B / D = 10 dB; C / D = 7 dB; B / C = 3 dB. That is, the difference of 10 decibels between two quantities is 10 times, the difference of 20 decibels is 100 times, and so on. The difference of 3 decibels is 2 times.

[0089] End: "end" in the first end / second end / third end / fourth end / ground end / open end of the main radiator, which cannot be understood as a physical disconnected end point or end part, but can also be considered as a section of the main radiator including the first end point, which is the end point of the main radiator at the gap. For example, the first end of the main radiator can be considered as a section of the main radiator within one-eighth of the first wavelength range from the first end point, where the first wavelength can be the wavelength corresponding to the working frequency range of the main radiator, the wavelength corresponding to the center frequency of the working frequency range, or the wavelength corresponding to the resonance point. In an embodiment, the "end / point" can include the connection / coupling area of the radiator coupled to other conductive structures, for example, the feed end / point can be the coupling area of the radiator coupled to the feed structure (for example, the area facing the part of the feed structure), and for example, the ground end / point can be the connection / coupling area of the radiator coupled to the ground structure.

[0090] Open end and closed end: In some embodiments, the open end and the closed end are, for example, relative to whether it is grounded or not, the closed end is grounded, and the open end is not grounded. In an embodiment, the open end can also be referred to as a suspended end, a free end, an open end, or an open circuit end. In an embodiment, the closed end can also be referred to as a grounded end or a short circuit end. It should be understood that in some embodiments, other conductors can be coupled to the open end to transfer coupled energy (which can be understood as transferring current).

[0091] 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.

[0092] 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.

[0093] 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.

[0094] In some embodiments, the understanding of "closed end" can also be from the view of current distribution, the closed end or ground end, etc. can be understood as a current large point on the radiator, or can be understood as a small electric field point on the radiator; in an embodiment, coupling electronic devices (e.g. inductive devices, etc.) through the closed end can not change the current distribution characteristics of the current large point / small electric field point; in an embodiment, opening a slit (e.g. 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 electric field point.

[0095] In some embodiments, the understanding of "open end" can also be from the view of current distribution, the open end or floating end, etc. can be understood as a current small point on the radiator, or can be understood as a large electric field point on the radiator; in an embodiment, coupling electronic devices (e.g. capacitive devices, etc.) through the open end can not change the current distribution characteristics of the current small point / large electric field point.

[0096] It should be understood that the radiator end at a gap (from the structure of the radiator, similar to the radiator at the opening of the open end or floating end) coupling electronic devices (e.g. capacitors, inductors, etc.) can make the radiator end a current large point / small electric field point, in which case it should be understood that the radiator end at the gap is actually a closed end or ground end, etc.

[0097] Capacitor: can be understood as lumped capacitance and / or distributed capacitance. Lumped capacitance includes components that are capacitive, such as capacitor elements; distributed capacitance (or distributed capacitance) includes the equivalent capacitance formed by two conductive pieces spaced apart by a certain gap.

[0098] Electrical length: the electrical length can refer to the physical length (i.e. mechanical length or geometric length) multiplied by the ratio of the transmission time of an electrical or electromagnetic signal in a medium to the time required for this signal to pass through the same distance in free space as the physical length of the medium, the electrical length can satisfy the following formula:

[0099] Where L is the physical length, a is the transmission time of an electrical or electromagnetic signal in a medium, and b is the transmission time in free space.

[0100] Alternatively, the electrical length can also refer to the ratio of the physical length (i.e. mechanical length or geometric length) to the wavelength of the transmitted electromagnetic wave, the electrical length can satisfy the following formula:

[0101] Where L is the physical length, and λ is the wavelength of the electromagnetic wave.

[0102] In some embodiments of the present application, the physical length of the radiator can be understood as the electrical length of the radiator within ±20%, for example, within ±10%, or within ±5%.

[0103] In some embodiments of the present application, the wavelength in a certain wavelength mode (e.g., the half-wavelength mode, etc.) of the antenna can refer to the wavelength of the signal radiated by the antenna. It should be understood that the wavelength of the radiated signal in air can be calculated as follows: wavelength = speed of light / frequency, where the frequency is the frequency of the radiated signal. The wavelength of the radiated signal in a medium can be calculated as follows: wavelength = (speed of light / √ε) / frequency, where ε is the relative permittivity of the medium, and the frequency is the frequency of the radiated signal.

[0104] Coupling: In the present application, it can be understood as indirect coupling. "Coupled connection" can be understood as indirect coupled connection. "Indirect coupling" can be understood as that two conductors are electrically connected through a space without contact. In an embodiment, the indirect coupling can also be referred to as capacitive coupling, for example, the signal transmission is realized by forming an equivalent capacitor through the coupling between the gap between the two conductive parts.

[0105] The above-mentioned definitions such as symmetry (e.g., axial symmetry, or central symmetry, etc.), parallel, vertical, same (e.g., same length, same width, etc.) and the like in the embodiments of the present application are all based on the current process level, rather than the absolute definition in the mathematical sense. There can be a predetermined angle deviation between two structures that are parallel or vertical to each other. In an embodiment, the predetermined threshold can be less than or equal to 1 mm, for example, the predetermined threshold can be 0.5 mm, or can be 0.1 mm. In an embodiment, the predetermined angle can be an angle within ±10°, for example, the predetermined angle deviation can be ±5°.

[0106] It should be noted that "vertical" in the embodiments of the present application means that there can be a predetermined angle deviation between the two. For example, the above-mentioned predetermined angle can be 85°, 86°, 87°, 88°, 89°, 90°, 91°, 92°, 93°, 94°, or 95°, and the like.

[0107] It should be noted that "parallel" in the embodiments of the present application means that there can be a predetermined angle deviation between the two. For example, the above-mentioned predetermined angle can be 0°, 0.5°, 1°, 1.5°, 2°, 3°, 4°, 4.5°, or 5°, and the like.

[0108] To facilitate the understanding of the communication terminal provided by the embodiments of the present application, the application scenario thereof is first introduced below. The communication terminal in the embodiments of the present application refers to a terminal with a communication function. Specifically, it can refer to a communication terminal using one or more of the following communication technologies: Bluetooth (BT) communication technology, global positioning system (GPS) communication technology, wireless fidelity (WiFi) communication technology, global system for mobile communications (GSM) communication technology, wideband code division multiple access (WCDMA) communication technology, long term evolution (LTE) communication technology, 5G communication technology, and other future communication technologies. The communication terminal in the embodiments of the present application can include a fixed terminal or a mobile terminal. For example, the mobile terminal can be a mobile phone, a tablet computer, a notebook computer, a smart bracelet, a smart watch, a smart helmet, and smart glasses, etc.; the fixed terminal can be a router, a smart television, a smart home, a smart speaker, and a desktop computer, etc. In addition, the above communication terminal can also be a handheld device, a computing device with a wireless communication function, or other processing devices connected to a wireless modem, a vehicle-mounted device, a communication terminal in a 5G network, or a communication terminal in a future evolved public land mobile network (PLMN), etc., which are not limited by the embodiments of the present application.

[0109] FIG. 1 exemplarily shows a communication terminal provided by the embodiments of the present application, which is explained by taking a mobile phone as an example. As shown in FIG. 1, in an embodiment, the communication terminal includes a cover 100, a display 200, a printed circuit board (PCB) 300, a middle frame 400, and a rear cover 500. It should be understood that in some embodiments, the cover 100 can be a cover glass, which can also be replaced by a cover made of other materials, such as a cover made of ultra-thin glass material, a cover made of PET (Polyethylene terephthalate) material, etc. In an embodiment, the above cover 100, middle frame 400, and rear cover 500 can all be considered as a housing.

[0110] In the above embodiment, the cover 100 can be arranged close to the display 200, which can mainly serve to protect and prevent dust from the display 200.

[0111] In an embodiment, the display screen 200 can include a liquid crystal display (LCD), a light emitting diode (LED) display panel, or an organic light-emitting diode (OLED) display panel, etc., which are not limited in the present application.

[0112] The middle frame 400 mainly plays a supporting role for the whole machine. In FIG. 1, the PCB 300 is shown to be disposed between the middle frame 400 and the back cover 500, and it should be understood that, in an embodiment, the PCB 300 can also be disposed between the middle frame 400 and the display screen 200, which are not limited in the present application. The printed circuit board PCB 300 can adopt a flame-retardant material (FR-4) dielectric plate, a Rogers dielectric plate, a hybrid dielectric plate of Rogers and FR-4, etc. Here, FR-4 is a code of a flame-retardant material grade, and the Rogers dielectric plate is a high-frequency board. The PCB 300 carries electronic components, such as a radio frequency chip, etc.

[0113] In an embodiment, a metal layer can be disposed on the printed circuit board PCB 300. The metal layer can be used for grounding of the electronic components carried on the printed circuit board PCB 300, and can also be used for grounding of other components, such as a bracket antenna, a frame antenna, etc. The metal layer can be referred to as a ground plate, or a grounding plate, or a grounding layer. In an embodiment, the metal layer can be formed by etching metal on the surface of any one of the dielectric plates in the PCB 300. In an embodiment, the metal layer for grounding can be disposed on one side of the printed circuit board PCB 300 close to the middle frame 400. In an embodiment, the edge of the printed circuit board PCB 300 can be regarded as the edge of its grounding layer. In an embodiment, the metal middle frame 400 can also be used for grounding of the above-mentioned components. The communication terminal can also have other ground plates / grounding plates / grounding layers, which are not described herein again.

[0114] The communication terminal can also include a battery (not shown in the figure). The battery can be disposed between the middle frame 400 and the back cover 500, or can be disposed between the middle frame 400 and the display screen 200, which are not limited in the present application. In some embodiments, the PCB 300 is divided into a main board and a sub-board, and the battery can be disposed between the main board and the sub-board, wherein the main board can be disposed between the upper edge of the middle frame 400 and the battery, and the sub-board can be disposed between the lower edge of the middle frame 400 and the battery.

[0115] The communication terminal can also include a bezel 600, which can be formed of a conductive material such as metal. The bezel 600 can be disposed between the display 200 and the back cover 500 and extend circumferentially around the periphery of the communication terminal. The bezel 600 can have four sides that surround the display 200 and help secure the display 200. In one implementation, the bezel 600 formed of metal material can be used directly as a metal bezel of the communication terminal, forming a metal bezel appearance, which is suitable for a metal industrial design (ID). In another implementation, the outer surface of the bezel 600 can also be a non-metal material, such as a plastic bezel, forming a non-metal bezel appearance, which is suitable for a non-metal ID.

[0116] The middle frame 400 can include the bezel 600, and the middle frame 400 including the bezel 600 as a one-piece can support the electronic devices in the entire machine. The cover plate 100 and the back cover 500 are respectively attached along the upper and lower edges of the bezel to form a housing of the communication terminal. Alternatively, the bezel 600 can not be considered as a part of the middle frame 400. In one embodiment, the bezel 600 can be connected to and integrally formed with the middle frame 400. In another embodiment, the bezel 600 can include a protruding member extending inward to be connected to the middle frame 400, for example, by a spring, a screw, welding, or the like. In one embodiment, the cover plate 100, the back cover 500, the bezel 600, and the middle frame 400 can be collectively referred to as a housing of the communication terminal. It should be understood that the "housing" can be used to refer to part or all of any one of the cover plate 100, the back cover 500, the bezel 600, or the middle frame 400, or part or all of any combination of the cover plate 100, the back cover 500, the bezel 600, or the middle frame 400.

[0117] The back cover 500 can be a back cover made of metal material; can be a back cover made of non-conductive material, such as a glass back cover, a plastic back cover, or the like non-metal back cover; or can be a back cover including both conductive material and non-conductive material.

[0118] In an embodiment, the frame 600 can at least partially serve as a radiator to receive / transmit radio frequency signals. The portion of the frame 600 serving as the radiator can be separated from other portions of the frame 400 or the middle frame 400, so that the radiator has a good radiation environment. In an embodiment, an aperture can be provided near the portion of the frame 600 serving as the radiator. In an embodiment, the aperture can include an internal aperture provided inside the communication terminal, for example, an aperture invisible from the appearance of the communication terminal. In an embodiment, the internal aperture can be formed by any one of the middle frame, the battery, the circuit board, the back cover, the display screen, and other internal conductive components, or formed by a combination of multiple components, for example, the internal aperture can be formed by a structural component of the middle frame. In an embodiment, the aperture can also include a slit provided on the frame 600. In an embodiment, the slit on the frame 600 can be a slit formed on the frame 600, and the frame 600 is divided into two parts at the slit without direct connection. In an embodiment, the aperture can also include a slit provided on the back cover 500 or the display screen 200. In an embodiment, the back cover 500 includes a conductive material, and the aperture provided at the conductive material can be in communication with the slit or the break of the frame, so as to form a continuous aperture on the appearance of the communication terminal.

[0119] In an embodiment, the radiator of the communication terminal can also be provided in the frame 600. The frame 600 includes a non-conductive material, and the radiator of the antenna can be located inside the communication terminal and provided along the frame 600, or the radiator can be at least partially embedded in the non-conductive material of the frame. In an embodiment, the radiator is provided against the non-conductive material of the frame 600, so as to minimize the volume occupied by the radiator and be closer to the outside of the communication terminal, thereby achieving better signal transmission effect. It should be noted that the radiator provided against the frame 600 means that the radiator can be closely provided against the frame 600, or can be provided close to the frame 600, for example, the radiator and the frame 600 can have a small gap therebetween.

[0120] In one embodiment, a radiator of the communication terminal can also be disposed in the housing, such as a bracket antenna, etc. (not shown in FIG. 1). A gap can exist between the radiator disposed in the housing and other conductive parts inside the housing, so as to ensure that the radiator has a good radiation environment. In one embodiment, an aperture can be disposed near the radiator. In one embodiment, the aperture can include an aperture disposed inside the communication terminal, such as an aperture that is not visible from the appearance surface of the communication terminal. In one embodiment, the aperture inside can be formed by any one of or collectively by a plurality of the following: a frame, a middle frame, a battery, a circuit board, a back cover, a display screen, and other internal conductive parts, such as the aperture inside can be formed by a structural part of the middle frame. In one embodiment, the aperture can also include a slit / slot / hole disposed on the frame 600. In one embodiment, the slit / slot / hole on the frame 600 can be a split formed on the frame, and the frame 600 is divided into two parts at the split without a direct connection relationship. In one embodiment, the aperture can also include a slit / slot / hole disposed on the back cover 500 or the display screen 200. In one embodiment, the back cover 500 includes a conductive material, and the aperture disposed at the conductive material can be in communication with the slot or split of the frame to form a coherent aperture on the appearance surface of the communication terminal. In one embodiment, the aperture on the back cover 500 or the display screen can also be used to place other devices, such as a camera, and / or a sensor, and / or a microphone, and / or a speaker, etc.

[0121] In one embodiment, the antenna can be in the form of a flexible printed circuit (FPC) based antenna, a laser-direct-structuring (LDS) based antenna, or a microstrip disk antenna (MDA), etc. In one embodiment, the antenna can also be in the form of a transparent or semi-transparent structure embedded inside the screen of the communication terminal, so that the antenna is a transparent antenna unit embedded inside the screen of the communication terminal.

[0122] FIG. 1 only schematically shows some components included in the communication terminal, and the actual shape, actual size, and actual structure of these components are not limited by FIG. 1.

[0123] To implement the communication function of the communication terminal, the communication terminal includes an antenna system, which generally includes a plurality of radiators formed into an antenna in a parallel structure to reduce the space occupied by the antenna system and to improve the integration and miniaturization of the communication terminal. However, the radiation efficiency of the parallel structure is limited, and the communication performance needs to be further improved.

[0124] Fig. 2 is a structural schematic diagram of an antenna system of a communication terminal according to an embodiment of the present application. As shown in Fig. 2, the antenna system of the communication terminal according to the embodiment of the present application comprises a radio frequency chip 31, a first main radiator 32, a second main radiator 33 and a feeding structure 34. The first main radiator 32 and the second main radiator 33 are arranged in parallel and spaced apart, forming a parallel structure. Specifically, the orthographic projection of the first main radiator 32 on a first plane M and the orthographic projection of the second main radiator 33 on the first plane M at least partially coincide, and the first plane M is perpendicular to a direction N of arrangement of the first main radiator 32 and the second main radiator 33. Referring to Fig. 2, in a specific embodiment, the direction N of arrangement is perpendicular to the extension direction of the first main radiator 32, and the extension direction of the first main radiator 32 is parallel to the first plane M. As viewed along the direction N of arrangement, the first main radiator 32 and the second main radiator 33 at least partially overlap.

[0125] The feeding structure 34 is connected to the radio frequency chip 31, thereby receiving a feeding signal of the radio frequency chip 31 and transmitting a signal to the radio frequency chip 31. The feeding structure 34 and the first main radiator 32 and the second main radiator 33 are arranged in parallel and spaced apart respectively, so that the feeding structure 34 and the first main radiator 32 form a coupled connection, and the feeding structure 34 and the second main radiator 33 form a coupled connection. Here, the "coupled connection" refers to "indirect coupling", and thus the feeding structure 34 and the first main radiator 32 and the second main radiator 33 are coupled to feed respectively, so that the feeding structure 34 transmits a signal between the radio frequency chip 31 and the first main radiator 32 and the second main radiator 33, enabling the first main radiator 32 and the second main radiator 33 to work.

[0126] It is worth noting that the first main radiator 32 and the second main radiator 33 mentioned in the embodiment of the present application are main branches. Fig. 3 is a structural schematic diagram of an antenna system according to an embodiment of the present application. As shown in Fig. 3, in actual application, the main branch can also be connected to a sub-branch 35, which is a branch connected to the main branch, and does not necessarily extend in the same direction as the main branch, and the size of the sub-branch 35 is usually smaller than that of the main branch, for example, it can be a character shape, an L shape or a T shape, etc. The present application does not describe the sub-branch 35 in detail.

[0127] The first main radiator 32, the second main radiator 33 and the feed structure 34 in the embodiments of the present application are all understood as straight line structures, but the width of the straight line structure is not necessarily regular, and can vary along the extension direction. For the convenience of description, taking the first main radiator 32 as an example, FIG. 4 and FIG. 5 show two structure diagrams of the first main radiator 32. As shown in FIG. 4 and FIG. 5, the straight line first main radiator 32, the second main radiator 33 and the feed structure 34 extend along a first direction X, i.e. the extension direction of the first main radiator 32, the second main radiator 33 and the feed structure 34. For the convenience of understanding the extension direction, it is considered that the maximum dimension L1 of the first main radiator 32 along the first direction X (extension direction) is greater than the maximum dimension W along a second direction Y. The second direction Y is perpendicular to the first direction X, and the "maximum dimension" refers to the distance between the two ends of the first main radiator 32 farthest apart along the direction.

[0128] As shown in FIG. 4, in an embodiment, the first main radiator 32 can include a plurality of staggered rectangular strips, so as to facilitate the preparation of the first main radiator 32 by using the structure of the communication terminal itself or to avoid interference with other existing structures. As shown in FIG. 5, in an embodiment, the first main radiator 32 can also be understood as a straight strip radiator with a groove, especially the first main radiator 32 on a medium board support such as a circuit board, which can avoid screws or metal structures on the medium board support.

[0129] In an optional embodiment, the first main radiator 32 mainly includes a relatively regular shape such as a rectangle or a trapezoid, and generally has parallel opposite sides. On this basis, there can be a semicircular groove or a rectangular groove to avoid interference structures.

[0130] The second main radiator 33 and the feed structure 34 in the embodiments of the present application can also have the structure characteristics of the first main radiator 32 described above, and the present application does not make specific description here.

[0131] In an embodiment, the structure of the second main radiator 33 can be the same as that of the first main radiator 32, or can be different from that of the first main radiator 32, which is not limited by the present application. For example, as shown in the embodiment of FIG. 2, the structure of the first main radiator 32 is the same as that of the second main radiator 33. FIG. 6 is a three-dimensional structure diagram of an antenna system in an embodiment of the present application. As shown in the embodiment of FIG. 6, the structure of the first main radiator 32 is different from that of the second main radiator 33.

[0132] Please refer to FIG. 2 and FIG. 6, the first main radiator 32, the second main radiator 33 and the feeding structure 34 are parallel to each other, which means that the extending direction of the first main radiator 32, the extending direction of the second main radiator 33 and the extending direction of the feeding structure 34 are the same, all of which are the first direction X. The first main radiator 32 and the second main radiator 33 can be arranged along the second direction Y, that is, the arrangement direction N of the first main radiator 32 and the second main radiator 33 can also be the second direction Y. For the convenience of description, the third direction Z is also included, the first direction X, the second direction Y and the third direction Z are parallel to each other, the first direction X and the third direction Z are both parallel to the first plane M, or in other words, the first direction X and the third direction Z determine the first plane M.

[0133] It is worth noting that the arrangement direction refers to the direction perpendicular to the extending direction of the first main radiator 32 and the second main radiator 33. The first main radiator 32 and the second main radiator 33 are arranged in parallel, so the arrangement direction of the parallel first main radiator 32 and the second main radiator 33 is perpendicular to the extending direction of the first main radiator 32. Simply put, the opposite sides of the first main radiator 32 and the second main radiator 33 are both planes, so the arrangement direction can also be understood as the direction of the line with the shortest distance between the first main radiator 32 and the second main radiator.

[0134] FIG. 7 is a side view of the antenna system along the second direction according to an embodiment of the present application. Please refer to FIG. 6 and FIG. 7, there are multiple possibilities for the positional relationship between the first main radiator 32 and the second main radiator 33. In one possible embodiment, the projection of the first main radiator 32 on the first plane M and the projection of the second main radiator 33 on the first plane M mostly coincide, that is, the first main radiator 32 and the second main radiator 33 mostly overlap when viewed along the arrangement direction N. For example, the overlapping area of the projection of the first main radiator 32 on the first plane M and the projection of the second main radiator 33 on the first plane M is greater than or equal to half of the area of the projection of the first main radiator 32 on the first plane M, further, the overlapping area of the projection of the first main radiator 32 on the first plane M and the projection of the second main radiator 33 on the first plane M is 60%, 65%, 70%, 75%, 80%, 85%, 88%, 90%, 92%, 95%, 98% or 100% of the area of the projection of the first main radiator 32 on the first plane M. In one specific embodiment, as shown in FIG. 7, the area of the projection of the first main radiator 32 on the first plane M is less than or equal to the area of the projection of the second main radiator 33 on the first plane M, the projection of the first main radiator 32 on the first plane M is completely located within the projection of the second main radiator 33 on the first plane M, so the first main radiator 32 and the second main radiator 33 completely overlap when viewed along the arrangement direction N.

[0135] For the positional relationship between the feeding structure 34 and the first main radiator 32 and the second main radiator 33, the feeding structure 34, the first main radiator 32 and the second main radiator 33 can be designed and selected according to the working frequency band of the antenna system, and the positional relationship between the feeding structure 34 and the first main radiator 32 and the second main radiator 33 mainly affects the area opposite to the feeding structure 34 and the first main radiator 32 and the area opposite to the feeding structure 34 and the second main radiator 33.

[0136] As shown in FIG. 6 and FIG. 7, in an embodiment, the first main radiator 32, the second main radiator 33 and the feeding structure 34 are located in the same plane, which can be the plane determined by the first direction X and the second direction Y. It can be understood that the first main radiator 32, the second main radiator 33 and the feeding structure 34 all have a certain thickness, and there can be a certain deviation in the thickness direction, but they are located in the same plane. For example, in an embodiment, the first main radiator 32, the second main radiator 33 and the feeding structure 34 are located on the surface of the same dielectric plate.

[0137] FIG. 8 is a side view of the antenna system along the second direction according to an embodiment of the present application. As shown in FIG. 6 and FIG. 8, in an embodiment, the first main radiator 32 and the second main radiator 33 are located in the same plane, and the feeding structure 34 is located in a plane different from the plane where the first main radiator 32 and the second main radiator 33 are located. In other words, the feeding structure 34 is located outside the plane where the first main radiator 32 and the second main radiator 33 are located. As shown in FIG. 8, the distance s between the feeding structure 34 and the plane where the first main radiator 32 and the second main radiator 33 are located can be designed and selected according to the working frequency band of the antenna system, the size of the first main radiator 32, the size of the second main radiator 33, the size of the feeding structure 34 and the space for arranging the antenna system. For example, in an embodiment, the first main radiator 32 and the second main radiator 33 are arranged on one dielectric plate, and the feeding structure 34 is arranged on another dielectric plate; or in an embodiment, the first main radiator 32 and the second main radiator 33 can be located in the frame of the communication terminal, and the feeding structure 34 is arranged on a dielectric plate.

[0138] It is worth noting that in FIG. 7 and FIG. 8, the first main radiator 32 and the second main radiator 33 are located in the same plane, and the length of the first main radiator 32 along the first direction X is the same as the length of the second main radiator 33 along the first direction X, and the second main radiator 33 blocks the first main radiator 32.

[0139] Please refer to FIG. 6, FIG. 7 and FIG. 8, in an embodiment, along the extending direction of the first main radiator 32 (i.e. the first direction X), one end of the feed structure 34 is located between the two ends of the first main radiator 32. Then, along the extending direction of the first main radiator 32, the feed structure 34 is partially opposite to the first main radiator 32 and the second main radiator 33. The larger the area of the feed structure 34 opposite to the first main radiator 32, the larger the coupling current of the first main radiator 32; the larger the area of the feed structure 34 opposite to the second main radiator 33, the larger the coupling current of the second main radiator 33. The part of the feed structure 34 along the first direction X is located between the two ends of the first main radiator 32, for example, at least 10% of the feed structure 34 along the first direction X is located between the two ends of the first main radiator 32. Specifically, 12%, 15%, 20%, 25%, 30%, 35%, 40%, 44%, 45%, 50%, 60%, 68%, 70%, 75%, 80% or 90% of the feed structure 34 along the first direction X can be located between the two ends of the first main radiator 32.

[0140] Please refer to FIG. 7, in an embodiment, the orthogonal projection of the feed structure 34 on the first plane M, the orthogonal projection of the first main radiator 32 on the first plane M and the orthogonal projection of the second main radiator 33 on the first plane M at least partially coincide. From the second direction Y, the first main radiator 32, the second main radiator 33 and the feed structure 34 at least partially overlap.

[0141] FIG. 9 is a side view of the antenna system along the second direction according to an embodiment of the present application. As shown in FIG. 8, in an embodiment, along the extending direction of the first main radiator 32 (i.e. the first direction X), the feed structure 34 and the first main radiator 32 have a gap. In this embodiment, both ends of the feed structure 34 are located outside the two ends of the first main radiator 32, and from the second direction Y, the feed structure 34 and the first main radiator 32 do not overlap. In this embodiment, the feed structure 34 and the first main radiator 32 can be arranged in the frame of the communication terminal to reduce the space occupied by the antenna system. In addition, a layout scheme of the antenna system can also be provided, and the antenna system can be arranged according to the actual structure of the communication terminal.

[0142] Fig. 10 is a schematic diagram of an architecture of an antenna system according to an embodiment of the present application, and Fig. 11 is a schematic diagram of an architecture of an antenna system according to an embodiment of the present application. As shown in Figs. 10 and 11, in the embodiments of the present application, the first main radiator 32 and the second main radiator 33 of the antenna system are fed by the feeding structure 34, and the feeding structure 34 is in the same direction in the current direction excited by the first main radiator 32 and in the current direction excited by the second main radiator 33, i.e., the feeding structure 34 excites the same current mode in the first main radiator 32 and the second main radiator 33, which can suppress the reverse current. In specific embodiments, Figs. 10 and 11 respectively show the current distribution of the antenna system according to the embodiments of the present application at two different resonance points, in summary, no matter at which resonance point, the current direction of the first main radiator 32 and the current direction of the second main radiator 33 of the antenna system according to the embodiments of the present application are in the same direction.

[0143] The same direction / opposite direction of the current on the first main radiator and the second main radiator mentioned in the embodiments of the present application should be understood as the direction of the main current on the first main radiator and the direction of the main current on the second main radiator are the same / opposite. The main current on the radiator can be understood as the main current of the radiator at the center frequency point of its working frequency band. It should also be understood that the first main radiator and the second main radiator in the embodiments of the present application are linearly extended main radiators, and the above-mentioned main current refers to the current in the direction from one end to the other end of the main radiator.

[0144] It is worth noting that the schematic diagrams of the architecture of the antenna system in the embodiments of the present application are all exemplary, for example, the specific settings of the feeding point, the open end and the ground end have many possibilities. For example, the specific feeding position and grounding position, or it is also possible to set electronic devices, and in different implementations; the electronic devices set may be different, for example, it is possible to set inductance, capacitance or the combination of inductance and capacitance, etc. Taking the feeding point as an example, only the feeding position is shown in the figure, and in specific implementations, the feeding line can be directly connected to the main radiator for feeding, or it is also possible to connect electronic devices between the feeding line and the main radiator, such as connecting inductance, capacitance or the combination of inductance and capacitance, etc.

[0145] Fig. 12 is a schematic diagram of an architecture of an antenna system of a communication terminal according to a comparative example, and Fig. 13 is a schematic diagram of an architecture of an antenna system of a communication terminal according to a comparative example. As shown in Figs. 12 and 13, in the comparative example, the first main radiator 32 is connected to the feeding line, so that the first main radiator 32 is the main feeding radiator, and the second main radiator 33 is coupled with the first main radiator 32, so that the second main radiator 33 generates parasitic current as a parasitic radiator. As shown in Figs. 12 and 13, in the comparative example, the feeding line can excite the first main radiator 32 and the second main radiator 33 to generate two forms of same direction current and reverse current.

[0146] Figure 14 is a comparison chart of return loss of the antenna system in the comparative example and the antenna system in the present application, and Figure 15 is a comparison chart of system radiation efficiency of the antenna system in the comparative example and the antenna system in the present application. In the comparison chart, the dotted line corresponds to the antenna system provided in the present application, and the solid line corresponds to the antenna system in the comparative example. In the comparative example, the antenna system generates two resonance points, 0.85 GHz and 0.89 GHz. As shown in Figure 12, the first main radiator 32 and the second main radiator 33 of the antenna system generate reverse currents at the resonance point 0.85 GHz. As shown in Figure 15, the radiation efficiency in this state is low, and an obvious efficiency dip occurs. As shown in Figure 13, the first main radiator 32 and the second main radiator 33 of the antenna system generate forward currents at the resonance point 0.89 GHz. As shown in Figure 15, the radiation efficiency in this state is relatively good, but the bandwidth of the antenna system in the comparative example is poor, and it is difficult to meet the communication requirements. In the technical solution of the present application, the antenna system generates two resonance points, 0.86 GHz and 0.92 GHz. The first main radiator 32 and the second main radiator 33 of the antenna system generate forward currents at both resonance points, and the current directions of the first main radiator 32 and the second main radiator 33 are turned when the resonance points change. As shown in Figure 10, for example, the first main radiator 32 and the second main radiator 33 generate forward currents at the resonance point 0.86 GHz, and the current direction is the same as that of the feeding structure 34. As shown in Figure 15, the radiation efficiency in this state is high. As shown in Figure 11, for example, the first main radiator 32 and the second main radiator 33 also generate forward currents at the resonance point 0.92 GHz, and the current direction is opposite to that of the feeding structure 34. As shown in Figure 15, the radiation efficiency in this state is also high. By coupling and feeding the first main radiator 32 and the second main radiator 33 through the feeding structure 34, the currents of the first main radiator 32 and the second main radiator 33 are kept in the same direction, the reverse currents are suppressed, the efficiency dip of the antenna system is suppressed, the radiation efficiency of the antenna system is improved, and the communication capability of the communication terminal is improved.

[0147] The technical solution of the present application is applicable to various types of radiators. Specifically, both the first main radiator and the second main radiator can each include a sub-radiator, which can be a sub-radiator with an electrical length of 1 / 2 of the dielectric wavelength, or a sub-radiator with an electrical length of 1 / 4 of the dielectric wavelength. Alternatively, at least one of the first main radiator and the second main radiator includes two sub-radiators, and the two sub-radiators are grounded at the end away from the gap.

[0148] The feeding structure 34 in the technical scheme of the present application can also have multiple selections. Specifically, the electric length of the feeding structure 34 is 1 / 2 of the dielectric wavelength, and both ends of the feeding structure 34 are open ends. Alternatively, the electric length of the feeding structure 34 is 1 / 4 of the dielectric wavelength, one end of the feeding structure 34 is an open end, and the other end is a grounded end. The dielectric wavelength in the embodiment of the present application is the dielectric wavelength corresponding to the frequency of the feeding structure 34 in the working frequency band.

[0149] The first main radiator 32 and the second main radiator 33 can be any of the above-described main radiators, and the feeding structure 34 can be any of the above-described feeding structures 34, which are selected and designed according to actual requirements. The following lists several possible specific embodiments of the antenna system. As shown in FIGS. 10 and 11, in one embodiment, the electrical length of the first main radiator 32 is 1 / 4 of a dielectric wavelength, the electrical length of the second main radiator 33 is 1 / 4 of a dielectric wavelength, the electrical length of the feeding structure 34 is 1 / 2 of a dielectric wavelength, and both ends of the feeding structure 34 are open ends. FIG. 16 is a schematic diagram of an architecture structure of the antenna system in an embodiment of the present application. As shown in FIG. 16, in one embodiment, the electrical length of the first main radiator 32 is 1 / 4 of a dielectric wavelength, the electrical length of the second main radiator 33 is 1 / 4 of a dielectric wavelength, the electrical length of the feeding structure 34 is 1 / 4 of a dielectric wavelength, and one end of the feeding structure 34 is an open end and the other end is a grounded end. FIG. 17 is a schematic diagram of an architecture structure of the antenna system in an embodiment of the present application. As shown in FIG. 17, in one embodiment, the electrical length of the first main radiator 32 is 1 / 2 of a dielectric wavelength, the electrical length of the second main radiator 33 is 1 / 2 of a dielectric wavelength, the electrical length of the feeding structure 34 is 1 / 4 of a dielectric wavelength, and one end of the feeding structure 34 is an open end and the other end is a grounded end. FIG. 18 is a schematic diagram of an architecture structure of the antenna system in an embodiment of the present application. As shown in FIG. 18, in one embodiment, the electrical length of the first main radiator 32 is 1 / 2 of a dielectric wavelength, the electrical length of the second main radiator 33 is 1 / 2 of a dielectric wavelength, the electrical length of the feeding structure 34 is 1 / 2 of a dielectric wavelength, and both ends of the feeding structure 34 are open ends. FIG. 19 is a schematic diagram of an architecture structure of the antenna system in an embodiment of the present application. As shown in FIG. 19, in one embodiment, the electrical length of the first main radiator 32 is 1 / 2 of a dielectric wavelength, the electrical length of the second main radiator 33 is 1 / 4 of a dielectric wavelength, the electrical length of the feeding structure 34 is 1 / 2 of a dielectric wavelength, and both ends of the feeding structure 34 are open ends. FIG. 20 is a schematic diagram of an architecture structure of the antenna system in an embodiment of the present application. As shown in FIG. 20, in one embodiment, the electrical length of the first main radiator 32 is 1 / 2 of a dielectric wavelength, the electrical length of the second main radiator 33 is 1 / 4 of a dielectric wavelength, the electrical length of the feeding structure 34 is 1 / 4 of a dielectric wavelength, and one end of the feeding structure 34 is an open end and the other end is a grounded end. FIG. 21 is a schematic diagram of an architecture structure of the antenna system in an embodiment of the present application. As shown in FIG. 21, in one embodiment, the first main radiator 32 includes a first sub-radiator 321 and a second sub-radiator 322, and the first sub-radiator 321 and the second sub-radiator 322 have a gap therebetween. The first sub-radiator 321 is grounded at an end away from the gap, and the second sub-radiator 322 is grounded at an end away from the gap.The second main radiator 33 includes a third sub-radiator 331 and a fourth sub-radiator 332, and a gap is formed between the third sub-radiator 331 and the fourth sub-radiator 332. The third sub-radiator 331 is grounded at an end away from the gap, and the fourth sub-radiator 332 is grounded at an end away from the gap. The feeding structure 34 has an electrical length of 1 / 2 of a dielectric wavelength, and both ends of the feeding structure 34 are open ends. Alternatively, in another embodiment, the first main radiator 32 and the second main radiator 33 are as shown in FIG. 21. The feeding structure 34 has an electrical length of 1 / 4 of a dielectric wavelength, and one end of the feeding structure 34 is an open end, and the other end is a grounded end. FIG. 22 is a schematic diagram of an architecture structure of an antenna system in an embodiment of the present application. As shown in FIG. 22, in an embodiment, the first main radiator 32 includes a first sub-radiator 321 and a second sub-radiator 322, and a gap is formed between the first sub-radiator 321 and the second sub-radiator 322. The first sub-radiator 321 is grounded at an end away from the gap, and the second sub-radiator 322 is grounded at an end away from the gap. The second main radiator 33 has an electrical length of 1 / 4 of a dielectric wavelength, and the feeding structure 34 has an electrical length of 1 / 2 of a dielectric wavelength, and both ends of the feeding structure 34 are open ends. FIG. 23 is a schematic diagram of an architecture structure of an antenna system in an embodiment of the present application. As shown in FIG. 23, in an embodiment, the first main radiator 32 includes a first sub-radiator 321 and a second sub-radiator 322, and a gap is formed between the first sub-radiator 321 and the second sub-radiator 322. The first sub-radiator 321 is grounded at an end away from the gap, and the second sub-radiator 322 is grounded at an end away from the gap. The second main radiator 33 has an electrical length of 1 / 2 of a dielectric wavelength, and the feeding structure 34 has an electrical length of 1 / 4 of a dielectric wavelength. One end of the feeding structure 34 is an open end, and the other end is a grounded end.

[0150] In the embodiments shown in FIGS. 16-23, the feeding structure 34 overlaps with the first main radiator 32 and the second main radiator 33 in the arrangement direction of the first main radiator 32 and the second main radiator 33, so that the feeding structure 34 and the first main radiator 32 and the second main radiator 33 have a large overlapping area. The feeding structure 34 and the first main radiator 32 and the second main radiator 33 form a magnetic-electric coupling, that is, the feeding structure 34 and the first main radiator 32 and the second main radiator 33 include both magnetic field coupling and electric field coupling, so that the coupling effect is improved. FIG. 24 is a schematic diagram of an architecture structure of an antenna system in an embodiment of the present application. As shown in FIG. 24, in an embodiment, the feeding structure 34 does not overlap with the first main radiator 32 and the second main radiator 33 in the arrangement direction of the first main radiator 32 and the second main radiator 33, so that the feeding structure 34 and the first main radiator 32 and the second main radiator 33 form an electric field coupling respectively, and the coupling feeding of the first main radiator 32 and the second main radiator 33 can also be achieved.

[0151] The feeding structure 34 in the present application can be at least one of an insulating support or an electrically conductive structure provided on an insulating back cover, a partial electrically conductive structure of a frame, and a microstrip line on a circuit board. In summary, the feeding structure 34 in the embodiments of the present application can realize the coupling feeding of the first main radiator 32 and the second main radiator 33, and the specific setting form has multiple choices.

[0152] The main radiators in the present application are also support main radiators or partial structures of a metal frame. It can be understood that the first main radiator 32 can be located on a support, and the second main radiator 33 can also be located on a support. Alternatively, the first main radiator 32 can be located on a metal frame of a communication terminal, and the second main radiator 33 can also be located on a metal frame of a communication terminal, etc.

[0153] The communication terminal in the embodiments of the present application can be a foldable mobile terminal. FIG. 25 is a kind of unfolded schematic diagram of communication terminal in the embodiments of the present application, as shown in FIG. 25, the foldable mobile terminal in the embodiments of the present application can include foldable support 1 and flexible screen 2, flexible screen 2 is installed on foldable support 1, foldable support 1 can change the unfolded or folded form of flexible screen 2, to form foldable mobile terminal. Under different use requirements, the foldable mobile terminal can have different display areas, so that the foldable mobile terminal can have a larger display area, and at the same time, the foldable mobile terminal can have better portability.

[0154] Please refer to FIG. 25, the above-mentioned foldable support 1 includes first shell 11, second shell 12 and first pivot 13, the first shell 11 and the second shell 12 can be folded or unfolded by the first pivot 13. As shown in the embodiment of FIG. 25, the foldable mobile terminal is a two-fold mobile terminal, in this embodiment, the first shell 11, the first pivot 13 and the second shell 12 of the foldable mobile terminal are connected in turn, the first pivot 13 can move, so that the first shell 11 and the second shell 12 are relatively folded or unfolded around the first pivot 13, realizing the switching between the first shell 11 and the second shell 12 in unfolding and folding.

[0155] FIG. 26 is a schematic view of a folding of a communication terminal according to an embodiment of the present application. As shown in FIG. 26, the foldable mobile terminal according to an embodiment of the present application can also be a three-fold mobile terminal. The foldable mobile terminal includes a first housing 11, a first hinge 13, a third housing 15, a second hinge 14, and a second housing 12, which are sequentially connected. In this embodiment, the first housing 11 and the third housing 15 rotate about the first hinge 13 to be folded or unfolded. The third housing 15 and the second housing 12 rotate about the second hinge 14 to be folded or unfolded. The first housing 11 and the second housing 12 are also foldable or unfoldable based on the first hinge 13, the third housing 15, and the second hinge 14. The first housing 11 and the second housing 12 of the three-fold mobile terminal can be folded or unfolded by the first hinge 13. In the unfolded state of the foldable mobile terminal, the first housing 11, the third housing 15, and the second housing 12 are sequentially arranged. In the folded state of the foldable mobile terminal, the first housing 11, the third housing 15, and the second housing 12 are sequentially stacked. In the folded state of the foldable mobile terminal, the first housing 11 and the second housing 12 are located at both sides, and thus the main radiators located in the first housing 11 and the second housing 12 can transmit or receive signals.

[0156] In summary, the foldable mobile terminal according to various embodiments of the present application can be a two-fold mobile terminal or a three-fold mobile terminal.

[0157] The first housing 11, the second housing 12, and / or the third housing 15 can form a mounting space, respectively, to mount a circuit board, a battery, a microphone, a speaker, a camera, and the like of the electronic device. The circuit board can integrate a main controller, a storage unit, an antenna module, a power management module, and the like of the electronic device. The battery can supply power to the flexible display 2, the circuit board, the microphone, the speaker, the camera, and the like. In one possible design, at least two of the first housing 11, the second housing 12, and the third housing 15 are provided with the mounting space, and the components of the electronic device are distributed in the housings. In another possible design, only one of the first housing 11, the second housing 12, and the third housing 15 is provided with the mounting space, and the components of the electronic device are concentrated in the mounting space.

[0158] The flexible screen 2 can be used to display information and provide an interactive interface for a user. In embodiments of the present application, the flexible screen 2 can be, but is not limited to, an organic light-emitting diode (OLED) display, an active-matrix organic light-emitting diode (AMOLED) display, a mini organic light-emitting diode display, a micro organic light-emitting diode display, a micro organic light-emitting diode display, a quantum dot light emitting diode (QLED) display, and the like.

[0159] The first housing 11, the second housing 12, or the third housing 15 includes a bezel, which can be formed of a conductive material such as metal or a non-conductive material such as plastic. The bezel can be disposed between the display and the back cover and extend circumferentially around the periphery of the foldable mobile terminal. The bezel can have four sides that surround the display, helping to secure the display.

[0160] In an implementation, a bezel that mainly includes a conductive material can be referred to as a conductive bezel or a metal bezel of the foldable mobile terminal, which is suitable for an industrial design (ID) of a metal appearance. In an implementation, an outer surface of the bezel is mainly a conductive material such as a metal material, thereby forming an appearance of a metal bezel. In these implementations, a conductive portion of the bezel that includes the outer surface can be used as an antenna radiator of the foldable mobile terminal and is generally referred to as a bezel antenna.

[0161] In another implementation, the outer surface of the bezel is mainly a non-conductive material, such as plastic, forming an appearance of a non-metallic bezel, suitable for a non-metallic ID. In an implementation, the inner surface of the bezel can include a conductive material, such as a metallic material. In this implementation, the conductive part of the inner surface of the bezel can be used as an antenna radiator of the foldable mobile terminal. It should be understood that the radiator provided on the inner surface of the bezel (or the conductive material of the inner surface) can be arranged against the non-conductive material of the bezel to minimize the volume occupied by the radiator and be closer to the outside of the foldable mobile terminal to achieve better signal transmission effect, and can also be referred to as a bezel antenna. It should be noted that the arrangement of the antenna radiator against the non-conductive material of the bezel means that the antenna radiator can be arranged against the inner surface of the non-conductive material, or can be embedded in the non-conductive material, or can be arranged close to the inner surface of the non-conductive material, for example, the antenna radiator and the inner surface of the non-conductive material can have a small gap. It should be understood that the conductive material and the non-conductive material can be regarded as part of the bezel.

[0162] FIG. 27 is a structure diagram of a communication terminal in an unfolded state according to an embodiment of the present application, and FIG. 28 is a structure diagram of a communication terminal in a folded state according to an embodiment of the present application. As shown in FIGS. 27 and 28, in an embodiment, the first main radiator 32 is located at the first housing 11, and the second main radiator 33 is located at the second housing 12. When the first housing 11 and the second housing 12 are in a folded state, the orthographic projection of the first main radiator 32 and the second main radiator 33 along the thickness direction of the communication terminal at least partially overlaps, that is, the thickness direction of the communication terminal is the arrangement direction N of the first main radiator 32 and the second main radiator 33. Therefore, the first main radiator 32 and the second main radiator 33 at least partially overlap along the thickness direction of the communication terminal, so that the first main radiator 32 and the second main radiator 33 form a parallel structure and are coupled and fed by the feed structure 34. In this embodiment, the antenna bandwidth and the radiation efficiency of the antenna system of the foldable mobile terminal in the folded state can be improved, and the communication capability of the foldable mobile terminal can be improved.

[0163] It should be understood that the "folded state" in the present application is the state when the first housing 11 and the second housing 12 are folded, and the thickness direction refers to the thickness direction of the terminal in the folded state. The orthographic projection of the first main radiator 32 and the second main radiator 33 along the thickness direction of the communication terminal at least partially overlaps, which can be understood as at least partially overlapping or completely overlapping in the plane perpendicular to the thickness direction. The plane perpendicular to the thickness direction can be simply understood as the plane of the screen or the plane of the back cover of the terminal in the folded state.

[0164] In this embodiment, the feeding structure 34 is arranged on the first housing 11, and in the unfolded state of the foldable mobile terminal, the feeding structure 34 of the first housing 11 is used to feed the first main radiator 32, so that the first main radiator 32 works as an antenna alone. FIG. 29 is a comparison diagram of return loss of the antenna system of the foldable mobile terminal in the unfolded state and the folded state according to an embodiment of the present application, and FIG. 30 is a comparison diagram of radiation efficiency of the antenna system of the foldable mobile terminal in the unfolded state and the folded state according to an embodiment of the present application. In the diagrams, the solid line represents the curve corresponding to the antenna system of the foldable mobile terminal in the folded state, and the dashed line represents the curve corresponding to the antenna system of the foldable mobile terminal in the unfolded state. As shown in FIGS. 29 and 30, the arrangement of the antenna system of the present application enables the foldable mobile terminal to have a wide bandwidth and radiation efficiency in both the folded state and the unfolded state, and thus the communication capability of the foldable mobile terminal can be improved.

[0165] In this embodiment, the first main radiator 32 can be arranged on a support and arranged on the first housing 11 as a support antenna, and the second main radiator 33 can also be arranged on a support and arranged on the second housing 12 as a support antenna.

[0166] In another embodiment, referring to FIGS. 27 and 28, the first housing 11 and the second housing 12 of the foldable mobile terminal both include a conductive structure, for example, the frame of the first housing 11 and the second housing 12 is made of metal material, or the first housing 11 and the second housing 12 are both made at least partially of metal material. The first main radiator 32 is part of the conductive structure of the frame of the first housing 11, and the second main radiator 33 is part of the conductive structure of the frame of the second housing 12. The frame of the foldable mobile terminal is directly used as the radiator of the antenna system to form a frame antenna. This scheme can reduce the space occupied by the antenna system in the foldable mobile terminal and improve the space utilization of the foldable mobile terminal. In addition, the main radiator of the antenna system can be less shielded, and the radiation capability of the main radiator can be improved. In a specific embodiment, the side where the first main radiator 32 is arranged is symmetrically arranged with the side where the second main radiator 33 is arranged, so that in the folded state of the foldable mobile terminal, the first main radiator 32 and the second main radiator 33 can form a parallel structure.

[0167] For the arrangement of the feeding structure 34, as shown in FIG. 27, in one embodiment, the radio frequency chip 31 and the feeding structure 34 are both arranged on the first housing 11. Specifically, the radio frequency chip 31 and the feeding structure 34 are arranged on the same housing, which is conducive to shortening the distance between the radio frequency chip 31 and the feeding structure 34, reducing the loss on the signal transmission path, and improving the signal transmission quality of the communication system.

[0168] As shown in FIG. 27 and FIG. 28, the feeding structure 34 in the embodiment of the present application can be located on the circuit board, or can also be located on the support. The feeding structure 34 in the scheme forms magnetic-electric coupling with the first main radiator 32 and the second main radiator 33, so that the feeding structure 34 and the first main radiator 32 and the second main radiator 33 can have a larger overlapping area, improving the coupling effect.

[0169] FIG. 31 is a schematic diagram of a partial structure of an antenna system of a foldable mobile terminal in an embodiment of the present application. As shown in FIG. 31, in another embodiment, the feeding structure 34 can also be a part of the conductive structure of the frame of the first housing 11. In this embodiment, neither the main radiator nor the feeding structure 34 occupies the space inside the housing, which is conducive to improving the integration of the foldable mobile terminal.

[0170] In this embodiment, the overlapping area between the feeding structure 34 and the main radiator is small, and in order to improve the coupling effect, the distance between the feeding structure 34 and the main radiator cannot be too large. Specifically, as shown in FIG. 31, the feeding structure 34 and the first main radiator 32 have a first gap therebetween, and the width δ of the first gap is less than or equal to 2 mm. Thus, the feeding structure 34 and the first main radiator 32 arranged in sequence can also have a good coupling effect, improving the communication capability of the antenna system.

[0171] In an embodiment, the shortest distance S1 between the feeding structure 34 and the first main radiator 32 and the shortest distance S2 between the feeding structure 34 and the second main radiator 33 satisfy: -30% S1≤S1-S2≤30% S1. The shortest distance S1 between the feeding structure 34 and the first main radiator 32 and the shortest distance S2 between the feeding structure 34 and the second main radiator 33 differ by no more than 30%, and both can be considered as the feeding structure 34 of the embodiment of the present application having a good feeding effect on the first main radiator and the second main radiator of the parallel structure, which is conducive to the antenna system having a good communication effect, for example, being conducive to the two radiators generating a substantially co-polarized radiation characteristic.

[0172] In an embodiment, the shortest distance S1 between the feeding structure 34 and the first main radiator 32 and the shortest distance S2 between the feeding structure 34 and the second main radiator 33 satisfy: -20% S1≤S1-S2≤20% S1. The shortest distance between the feeding structure 34 and the first main radiator 32 and the shortest distance between the feeding structure 34 and the second main radiator 33 differ by no more than 20%, which can be considered as the feeding structure 34 of the embodiment of the present application having a good symmetric feeding on the first main radiator and the second main radiator of the parallel structure, which is conducive to the antenna system having a good communication effect, for example, being conducive to the two radiators generating a more co-polarized radiation characteristic.

[0173] In one embodiment, the shortest distance S1 between the feeding structure 34 and the first main radiator 32 and the shortest distance S2 between the feeding structure 34 and the second main radiator 33 satisfy -10% S1≤ S1-S2≤ 10% S1. The shortest distance between the feeding structure 34 and the first main radiator 32 and the shortest distance between the feeding structure 34 and the second main radiator 33 differ by no more than 10%, which can be considered as the effect of the feeding structure 34 of the present embodiment on the first main radiator and the second main radiator of the parallel structure having symmetric feeding, and is beneficial to making the antenna system have better communication effect, for example, beneficial to the two radiators generating the same polarization radiation characteristics.

[0174] In order to improve the symmetry of the feeding, the shortest distance S1 between the feeding structure 34 and the first main radiator 32 and the shortest distance S2 between the feeding structure 34 and the second main radiator 33 are the same, that is, S1=S2. Here, the two shortest distances are "the same" in the design size. In actual landing process, due to factors such as process error and installation tolerance, the shortest distance between the feeding structure 34 and the first main radiator 32 and the shortest distance between the feeding structure 34 and the second main radiator 33 may have a certain deviation. For example, it can be considered that the shortest distance S1 between the feeding structure 34 and the first main radiator 32 and the shortest distance S2 between the feeding structure 34 and the second main radiator 33 can have a tolerance of 3%. That is, -3% S1≤ S1-S2≤ 3% S1. Thus, the strength of the coupling current formed by the first main radiator 32 and the strength of the coupling current formed by the second main radiator 33 are close, which is beneficial to improving the radiation efficiency of the parallel structure antenna.

[0175] In a specific implementation, the structure and type of the first main radiator 32 and the second main radiator 33 are not limited, and can refer to several embodiments shown in FIGS. 10, 11 and 16-24. Alternatively, as shown in FIGS. 31-34, for example, in the embodiments shown in FIGS. 31-33, the feeding end of the feeding structure 34 is adjacent to the open end of the first main radiator 32 and the second main radiator 33; and as shown in FIG. 31, the first main radiator 32 and the second main radiator 33 can not be provided with a grounding point; or as shown in FIG. 32, only the first main radiator 32 can be provided with a grounding point; or as shown in FIG. 33, the first main radiator 32 and the second main radiator 33 can be provided with a grounding point. As shown in FIG. 34, in one embodiment, the grounding end of the feeding structure 34 can be adjacent to the grounding end of the first main radiator 32 and the second main radiator 33. The embodiments of the present application are only several examples and are not an exhaustive enumeration of the specific architecture of the antenna system.

[0176] FIG. 35 is a schematic diagram of a partial structure of an antenna system of a foldable mobile terminal according to an embodiment of the present application. As shown in FIG. 35, in actual application, for example, when the antenna system is applied to a foldable mobile terminal, the first main radiator 32 and the feed structure 34 are located in the same housing, and the second main radiator 33 is located in another housing. It is difficult to control the shortest distance between the first main radiator 32 and the feed structure 34 to be the same as the shortest distance between the second main radiator 33 and the feed structure 34. Generally, in this scheme, the shortest distance between the second main radiator 33 and the feed structure 34 is greater than the shortest distance between the first main radiator 32 and the feed structure 34. At this time, the electrical length of the second main radiator 33 can be made less than the electrical length of the first main radiator 32, so that the strength of the coupling current formed by the first main radiator 32 and the strength of the coupling current formed by the second main radiator 33 are close to each other, forming an antenna architecture with symmetric feeding, which is beneficial to improving the radiation efficiency of the parallel structure antenna.

[0177] In the embodiment of the present application, the electrical length of the first main radiator 32 and the electrical length of the second main radiator 33 can be the same or different. When the electrical length of the first main radiator 32 and the electrical length of the second main radiator 33 are different, they should not be too different in order to improve the feeding symmetry of the antenna system. For example, if the first main radiator 32 and the second main radiator 33 are both radiators with an electrical length of 1 / 2 of the dielectric wavelength or both are radiators with an electrical length of 1 / 4 of the dielectric wavelength, the electrical length of the first main radiator 32 and the electrical length of the second main radiator 33 satisfy: If the first main radiator 32 is a radiator with an electrical length of 1 / 2 of the dielectric wavelength, and the second main radiator 33 is a radiator with an electrical length of 1 / 4 of the dielectric wavelength, then If the first main radiator 32 is a radiator with an electrical length of 1 / 4 of the dielectric wavelength, and the second main radiator 33 is a radiator with an electrical length of 1 / 2 of the dielectric wavelength, then

[0178] In a specific embodiment, in terms of physical structure, the length L1 of the first main radiator 32 and the length L2 of the second main radiator 33 satisfy: -20% L1≤L1-L2≤20% L1. The length of the first main radiator 32 and the length of the second main radiator 33 differ by no more than 20%, which can be considered as a parallel structure antenna according to the embodiment of the present application, which is beneficial to making the antenna system have good communication effect.

[0179] Alternatively, if the first main radiator 32 is a radiator with an electrical length of 1 / 2 of a dielectric wavelength and the second main radiator 33 is a radiator with an electrical length of 1 / 4 of a dielectric wavelength, -20%L2≤1 / 2*L1-L2≤20%L2 can be achieved. If the first main radiator 32 is a radiator with an electrical length of 1 / 4 of a dielectric wavelength and the second main radiator 33 is a radiator with an electrical length of 1 / 2 of a dielectric wavelength, -20%L1≤L1-1 / 2*L2≤20%L1 can be achieved.

[0180] The length L1 of the first main radiator 32 in the embodiments of the present application can be understood as the straight-line distance between the two ends of the first main radiator 32 along the extension direction (the first direction X). For example, in the embodiments shown in FIGS. 4 and 5, the first main radiator 32 is not a regular rectangular structure. In this case, the length L1 of the first main radiator 32 does not need to consider the bending or notched structure of the first main radiator 32, and only the straight-line distance between the two ends of the first main radiator along the extension direction can be taken as the length L1. The determination method of the length L2 of the second main radiator 33 is consistent with that of the length L1 of the first main radiator 32, which will not be described here.

[0181] The antenna system in the embodiments of the present application can work in a low frequency band, or in a medium-high frequency band. Specifically, the operating frequency band of the above-mentioned antenna system can be located in the range of 0.6GHz-1.6GHz, specifically, the operating frequency band of the antenna system can partially coincide with the above-mentioned range of 0.6GHz-1.6GHz; or the operating frequency band of the above-mentioned antenna system can be located in the range of 1.6GHz-6GHz, specifically, the operating frequency band of the antenna system can partially coincide with the above-mentioned range of 1.6GHz-6GHz.

[0182] FIG. 36 is a schematic diagram of a cross-sectional structure of the antenna system at A-A of FIG. 28. As shown in FIG. 36, the feed structure 34 is arranged in the first housing 11, and the feed structure 34 and the first main radiator 32 have a second gap along the third direction Z, and the width s of the second gap satisfies:

[0183] When the operating frequency band of the first main radiator 32 is located in the range of 0.6GHz-1.6GHz, 0.15mm≤s≤5mm;

[0184] When the operating frequency band of the first main radiator 32 is located in the range of 1.6GHz-6GHz, 0.3mm≤s≤7mm;

[0185] The first main radiator 32 and the second main radiator 33 are arranged along the first direction X, which can also be understood as the thickness direction and the arrangement direction NN. The first main radiator 32 extends along the second direction Y, and the third direction Z is perpendicular to the first direction X and the second direction Y.

[0186] The above-mentioned feeding structure 34 meets the above-mentioned conditions, which is conducive to effectively feeding the first main radiator 32 and the second main radiator 33, thereby improving the feeding effect and enhancing the communication capability of the antenna system.

[0187] Figure 37 is a schematic diagram of a side view of a communication terminal according to an embodiment of the present application. As shown in Figure 37, in one embodiment of the present application, the communication terminal further includes a second hinge 14 and a third housing 15, wherein the first housing 11, first hinge 13, third housing 15, second hinge 14, and second housing 12 are sequentially connected. In this embodiment, the first housing 11 and third housing 15 rotate about the first hinge 13 to fold or unfold; the third housing 15 and second housing 12 rotate about the second hinge 14 to fold or unfold. The first housing 11 and second housing 12 also fold or unfold relative to the first hinge 13, third housing 15, and second hinge 14. Therefore, the first housing 11 and second housing 12 in the three-fold foldable mobile terminal can also be folded or unfolded relative to each other via the first hinge 13. When the foldable mobile terminal is unfolded, the first housing 11, third housing 15, and second housing 12 are arranged sequentially; when the foldable mobile terminal is folded, the first housing 11, third housing 15, and second housing 12 are stacked sequentially. When the foldable mobile terminal is in a folded state, the first shell 11 and the second shell 12 are located on both sides, which facilitates the main radiators located in the first shell 11 and the second shell 12 to send or receive signals.

[0188] In a further embodiment, when the communication terminal is a three-fold foldable mobile terminal, the feeding structure 34 can be located in the third shell 15, which is conducive to symmetrically arranging the first main radiator 32 and the second main radiator 33 on both sides of the feeding structure 34 to achieve symmetrical feeding.

[0189] Furthermore, the feed structure 34 can be a partially conductive structure of the frame of the third housing. For example, the third housing 15 is a metal housing, and the feed structure 34 is located in the third housing 15. Utilizing a partially conductive structure of the third housing 15 as the feed structure 34 helps reduce the space occupied by the antenna system and improve the integration of the communication terminal.

[0190] The above are only specific embodiments of the present application, but the scope of protection of this application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A communication terminal, characterized by comprising: The communication terminal comprises a radio frequency chip, a first main radiator, a second main radiator and a feeding structure, wherein: The first main radiator, the second main radiator and the feeding structure are arranged in parallel and spaced apart in pairs, the first main radiator and the second main radiator have at least partially overlapped projections on a first plane, and the first plane is perpendicular to the arrangement direction of the first main radiator and the second main radiator; The feeding structure is connected with the radio frequency chip, the feeding structure is used for coupling and feeding the first main radiator and the second main radiator, and the shortest distance S1 between the feeding structure and the first main radiator and the shortest distance S2 between the feeding structure and the second main radiator satisfy: -30% S1≤S1-S2≤30% S1.

2. The communication terminal of claim 1, wherein, The shortest distance S1 between the feeding structure and the first main radiator and the shortest distance S2 between the feeding structure and the second main radiator satisfy: S1=S2.

3. The communication terminal according to claim 1 or 2, characterized by The feeding structure, the first main radiator and the second main radiator are located in the same plane.

4. The communication terminal according to any one of claims 1 to 3, characterized by Along the extension direction of the first main radiator, one end of the feeding structure is located between the two ends of the first main radiator.

5. The communication terminal according to any one of claims 1 to 3, characterized by Along the extension direction of the first main radiator, there is a gap between the feeding structure and the first main radiator.

6. The communication terminal according to any one of claims 1 to 5, characterized by The electrical length of the first main radiator and the electrical length of the second main radiator satisfy:

7. The communication terminal according to any one of claims 1 to 5, characterized by The electrical length of the first main radiator The electrical length of the second main radiator satisfies: or 8. The communication terminal according to any one of claims 1 to 7, characterized by The length L1 of the first main radiator and the length L2 of the second main radiator satisfy: -20% L1≤L1-L2≤20% L1.

9. The communication terminal according to any one of claims 1 to 7, characterized by The length L1 of the first main radiator and the length L2 of the second main radiator satisfy: -20% L1≤L1-1 / 2*L2≤20% L1, or -20% L2≤1 / 2*L1-L2≤20% L2. 10.The communication terminal according to any one of claims 1-9, wherein: The electrical length of the feeding structure is 1 / 2 dielectric wavelength, and both ends of the feeding structure are open ends. Or, the electrical length of the feeding structure is 1 / 4 dielectric wavelength, and one end of the feeding structure is an open end and the other end is a grounded end. The dielectric wavelength is the dielectric wavelength corresponding to the frequency of the feeding structure in the working frequency band. 11.The communication terminal according to any one of claims 1-10, wherein: The electrical length of the first main radiator is 1 / 2 dielectric wavelength, and the electrical length of the second main radiator is 1 / 2 dielectric wavelength. Or, the electrical length of the first main radiator is 1 / 4 dielectric wavelength, and the electrical length of the second main radiator is 1 / 4 dielectric wavelength. Or, the electrical length of the first main radiator is 1 / 2 dielectric wavelength, and the electrical length of the second main radiator is 1 / 4 dielectric wavelength. The dielectric wavelength is the dielectric wavelength corresponding to the frequency of the feeding structure in the working frequency band.

12. The communication terminal according to any one of claims 1 to 11, characterized by The first main radiator comprises a first sub-radiator and a second sub-radiator, there is a gap between the first sub-radiator and the second sub-radiator, one end of the first sub-radiator away from the gap is grounded, and one end of the second sub-radiator away from the gap is grounded.

13. The communication terminal according to any one of claims 1 to 12, characterized by The second main radiator comprises a third sub-radiator and a fourth sub-radiator, a gap is formed between the third sub-radiator and the fourth sub-radiator, one end of the third sub-radiator away from the gap is grounded, and one end of the fourth sub-radiator away from the gap is grounded.

14. The communication terminal according to any one of claims 1 to 13, characterized by The feeding structure comprises at least one of a conductive structure arranged on an insulating support or an insulating back cover, a partial conductive structure of a frame, and a microstrip line on a circuit board.

15. The communication terminal according to any one of claims 1 to 14, characterized by The feeding structure is in the same direction in terms of current direction when the first main radiator is excited and in terms of current direction when the second main radiator is excited.

16. The communication terminal according to any one of claims 1 to 15, characterized by The communication terminal further comprises a first housing, a second housing and a first rotating shaft, the first housing and the second housing can be folded or unfolded relative to the first rotating shaft. The first main radiator is located in the first housing, and the second main radiator is located in the second housing, when the first housing and the second housing are in a folded state, the arrangement direction is the thickness direction of the communication terminal.

17. The communication terminal of claim 16, wherein, The first main radiator is a partial conductive structure of a frame of the first housing, and the second main radiator is a partial conductive structure of a frame of the second housing.

18. The communication terminal according to claim 16 or 17, characterized by The radio frequency chip and the feeding structure are arranged in the first housing.

19. The communication terminal of claim 18, wherein, The length of the second main radiator is less than the length of the first main radiator.

20. The communication terminal of claim 18 or 19, characterized by The feeding structure is a partial conductive structure of a frame of the first housing.

21. The communication terminal of claim 20, wherein, The feeding structure and the first main radiator have a first gap, and the width of the first gap is less than or equal to 2mm.

22. The communication terminal of claim 18 or 19, characterized by The feeding structure is arranged in the first housing, the feeding structure and the first main radiator have a second gap in a third direction, and the width s of the second gap satisfies: When the operating frequency band of the first main radiator is located in 0.6GHz-1.6GHz, 0.15mm≤s≤5mm; When the operating frequency band of the first main radiator is located in 1.6GHz-6GHz, 0.3mm≤s≤7mm; The third direction is perpendicular to the arrangement direction and the extension direction of the first main radiator.

23. The communication terminal according to claim 16 or 17, characterized by The communication terminal further comprises a second rotating shaft and a third housing, wherein: the first housing, the first rotating shaft, the third housing, the second rotating shaft and the second housing are connected in sequence; and the feeding structure is arranged in the third housing.

24. The communication terminal of claim 23, wherein, The feeding structure is a partial conductive structure of a frame of the third housing.

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