Foldable electronic device

Abstract

The invention provides foldable electronic equipment, and an antenna device comprises a first radiator, a second radiator, a first feed circuit, a second feed circuit, and a first tuning circuit. The length of the second radiator between the third open end and the second open end is larger than the length of the first radiator between the grounding end and the first open end, when the electronic equipment is in a folded state, the projection of the first open end and the projection of the second open end at least partially coincide, and the projection of the grounding end is located between the first grounding point and the second open end. The first tuning circuit is used for adjusting the second working frequency band to be the same as or adjacent to the first working frequency band. The electric field strong points of the two radiators are mutually coupled to form a first current path, the current strong points of the two radiators are mutually coupled to form a second current path, and the directions of the two current paths are opposite, so that the two radiators can obtain better isolation when independently working in the same frequency band or adjacent frequency bands.

Description

Technical Field

[0001] The present application relates to the field of communication technology, and in particular to a foldable electronic device. Background Art

[0002] In foldable electronic products such as foldable phones, some models have antennas on both sides of the hinge. When the phone is folded, the antennas on both sides of the hinge are close to each other, resulting in poor isolation and poor antenna performance when the two antennas work independently. Summary of the invention

[0003] In view of this, the present application provides a foldable electronic device, so that when the foldable electronic device is in a folded state, antennas located on both sides of a rotating shaft can have good isolation.

[0004] An embodiment of the present application provides a foldable electronic device, wherein the electronic device includes an antenna device, a first body, a second body and a rotating shaft, wherein the first body and the second body are respectively arranged on both sides of the rotating shaft and are rotatably connected to the rotating shaft, the first body includes a first floor, and the second body includes a second floor. The antenna device includes: a first radiator, a second radiator, a first feeding circuit, a second feeding circuit and a first tuning circuit. The first radiator is arranged on the first body, and the first radiator is provided with a grounding end and a first open end, and the grounding end is coupled to the first floor; the first radiator includes a first feeding point. The first feeding circuit is coupled to the first radiator through the first feeding point, and is used to feed a signal of a first working frequency band to the first radiator, and the first radiator is used to generate a first resonance corresponding to the first working frequency band. The second radiator is arranged on the second body, and the second radiator is provided with a second open end, a third open end and a first grounding point located between the second open end and the third open end, and the first grounding point is coupled to the second floor; the ratio of the length between the third open end and the second open end of the second radiator to the length between the grounding end and the first open end of the first radiator is greater than 1 and less than or equal to 2; the second radiator includes a second feeding point. The second feeding circuit is coupled to the second radiator through the second feeding point, and is used to feed the second radiator with a signal of a second working frequency band, and the second radiator is used to generate a second resonance corresponding to the second working frequency band, and the second working frequency band is the same as or adjacent to the first working frequency band. One end of the first tuning circuit is coupled to the second radiator, and the other end is coupled to the second floor, and is used to adjust the second resonance of the second radiator to correspond to the second working frequency band. When the electronic device is in a folded state, along the thickness direction of the electronic device, the projections of the first open end and the second open end at least partially overlap, and the projection of the grounding end is located between the projection of the third open end and the projection of the second open end.

[0005] In the present application, by connecting the first tuning circuit at the second feeding point of the second radiator, the resonant frequency band of the second radiator can be adjusted to be the same as or adjacent to the resonant frequency band of the first radiator through the first tuning circuit. At the same time, by making the length of the second radiator between the third open end and the second open end greater than the length of the first radiator between the ground end and the first open end, when the electronic device is in a folded state, the projections of the first open end and the second open end along the thickness direction of the electronic device at least partially overlap, and the projection of the ground end is located between the first ground point and the second open end. When the first feeding circuit feeds the first radiator through the first feeding point and the second feeding circuit feeds the second radiator through the second feeding point, electric field strength points can be formed at both the first open end and the second open end, and because the projections of the first open end and the second open end along the thickness direction of the electronic device at least partially overlap, the electric field strength point of the first open end and the electric field strength point of the second open end can be coupled with each other, and a first current path is generated. At the same time, the grounding end of the first radiator and the first grounding point of the second radiator are respectively current strong points. The current strong points of the two radiators can be coupled to form a second current path. The direction of the first current path and the direction of the second current path are opposite to each other. Therefore, when the first current path and the second current path meet the phase cancellation condition, the two radiators can obtain better isolation when working in the same frequency band or adjacent frequency bands, so that the two radiators can work normally and independently when the electronic device is in a folded state.

[0006] In a possible implementation, the second radiator includes a second grounding point, and the second grounding point is arranged between the first grounding point and the second feeding point. The antenna device also includes a second tuning circuit, one end of the second tuning circuit is connected to the second grounding point, and the other end is connected to the second ground. The second tuning circuit can adjust the efficiency pit of the second radiator, so that the efficiency pit of the second radiator becomes shallower or moves out of band, so that there is a higher isolation between the two radiators, so that both radiators can obtain better antenna performance.

[0007] In a possible implementation, the second tuning circuit includes a capacitor and / or an inductor and / or a radio frequency switch. The second tuning circuit may include a capacitor or an inductor, or may be composed of a capacitor and an inductor, or may include a radio frequency switch, and the radio frequency switch has multiple branches, and each branch may be connected to a capacitor or an inductor, so that the design of the second tuning circuit is more flexible and can be adapted to a variety of application scenarios.

[0008] In a possible implementation, when the electronic device is in a folded state, along the thickness direction of the electronic device, the projection of the grounding end is at least partially located between the projection of the first grounding point and the projection of the second grounding point. The grounding end, the first grounding point, and the second grounding point are staggered from each other, so that the return paths of the grounding end and the first grounding point are different, which is beneficial to improving the isolation of the first radiator and the second radiator when they are working. At the same time, making the return paths of the grounding end and the second grounding point different is beneficial to adjusting the efficiency pit through the second tuning circuit connected to the second grounding point, so that the current paths of the first radiator and the second radiator meet the phase cancellation condition, so that the first radiator and the second radiator can obtain better isolation when they work separately in the folded state of the electronic device.

[0009] In a possible implementation, the ground terminal is electrically connected to the first floor, and the electrical connection means that the ground terminal and the first floor are directly electrically connected, or the ground terminal and the first floor are electrically connected through a physical element, thereby ensuring the quality of energy transmission.

[0010] In a possible implementation, the first radiator, the ground terminal and at least a portion of the first floor are integrally formed, thereby ensuring the reliability of the structural connection between the first radiator, the ground terminal and the first floor, and also simplifying the processing technology and improving the processing accuracy. In one embodiment, the middle frame of an electronic device such as a mobile phone is an integrally formed structure, and part of the middle frame can be reused as the first radiator, the ground terminal and the first floor in this application. In one implementation, the first floor can be the middle plate part of the middle frame in an electronic device such as a mobile phone.

[0011] In a possible implementation manner, the electrical length of the first radiator between the ground end and the first open end is 1 / 4 λ, λ is a wavelength corresponding to the first working frequency band. The first radiator with this electrical length can obtain better signal receiving and transmitting quality and have a smaller structural size, which is conducive to realizing the miniaturization design of the antenna device.

[0012] In a possible implementation, the electrical length of the second radiator between the first ground point and the second open end is between 1 / 4 λ~ 1 / 2 λ, where λ is a wavelength corresponding to the second working frequency band. The second radiator has a larger electrical length than the first radiator, which is beneficial to improving the isolation between the first radiator and the second radiator when they work independently, and can ensure that the second radiator obtains better signal reception and transmission quality, which is also beneficial to achieving structural miniaturization.

[0013] In a possible implementation, the antenna device further includes a third tuning circuit, one end of the third tuning circuit is connected to the first radiator, and the other end is connected to the first floor. The third tuning circuit can adjust the resonant frequency of the first radiator to lower the resonant frequency of the first radiator, so that the resonant frequency of the first radiator is the same as or adjacent to the resonant frequency of the second radiator.

[0014] In a possible implementation, the third tuning circuit includes a capacitor and / or an inductor and / or a radio frequency switch, which is used to adjust the first resonance to correspond to the first working frequency band. The third tuning circuit can have a similar structure to the aforementioned first tuning circuit, that is, the third tuning circuit can also include a capacitor or an inductor, or can be composed of a capacitor and an inductor, or include a radio frequency switch, and the radio frequency switch has multiple branches, and a capacitor or an inductor can be connected to each branch, so that the design of the third tuning circuit can be more flexible, which is conducive to meeting a variety of application scenarios. In the process of adjusting the performance parameters of the first radiator and the second radiator, the first resonance of the first radiator can be adjusted to the corresponding first working frequency band through the third tuning circuit, and then the second tuning circuit connected to the second grounding point on the second radiator can be adjusted. The efficiency pit of the second radiator can be adjusted through the second tuning circuit, so that the efficiency pit of the second radiator becomes shallower or moves out of the band, so that the second radiator and the first radiator have better isolation. Then, the first tuning circuit is adjusted so that the second resonance of the second radiator is located within the corresponding second operating frequency band, and the second operating frequency band is the same as or adjacent to the first operating frequency band, so that the first radiator and the second radiator can have good isolation when working independently at the same frequency or adjacent frequencies, and good antenna performance can be obtained.

[0015] In one possible implementation, the second tuning circuit includes a first inductor, and the third tuning circuit includes a second inductor, and the inductance value of the first inductor is smaller than the inductance value of the second inductor, thereby facilitating adjusting the resonant frequencies of the first radiator and the second radiator to the same or adjacent frequencies, thereby achieving the same-frequency or adjacent-frequency operation of the first radiator and the second radiator.

[0016] In a possible implementation, the distance between the first feeding point and the first open end is less than 7.5 mm, and the distance between the second feeding point and the second open end is less than 7.5 mm. Thus, the first feeding point can be made closer to the first open end, and the second feeding point can be made closer to the second open end, so that the first radiator forms an electric field strength point at the first open end, and the second radiator forms an electric field strength point at the second open end. When the electronic device is in a folded state, the electric field strength point of the first radiator and the electric field strength point of the second radiator can couple with each other to form a current path, so that the current path can be offset by another current path formed by coupling the ground ends of the two radiators, thereby improving the isolation of the two radiators when working independently.

[0017] In a possible implementation, the electrical length between the first feeding point and the first open end is less than 1 / 8 λ, λ is a wavelength corresponding to the first operating frequency band, and the electrical length between the second feeding point and the second open end is less than 1 / 8 λ, λ is a wavelength corresponding to the second working frequency band. Thus, the first feeding point can be made closer to the first open end, and the second feeding point can be made closer to the second open end, which will not be described in detail here.

[0018] In a possible implementation, the first radiator is disposed on a side of the first body away from the rotation axis, and the second radiator is disposed on a side of the second body away from the rotation axis. When the electronic device is in a flattened state, there is a large distance between the first radiator and the second radiator, so that the first radiator and the second radiator can have better isolation when they work independently. When the electronic device is in a folded state, the first radiator and the second radiator are close to each other, and a path formed by the electric field strength point coupling of the two radiators and another current path formed by the current strength point coupling cancel each other out, so that the two radiators can also obtain better isolation when they work independently.

[0019] In a possible implementation, the first radiator is disposed on a side of the first body adjacent to the rotation axis, and the second radiator is disposed on a side of the second body adjacent to the rotation axis, and in the axial direction of the rotation axis, the first radiator and the second radiator are both located on the same side of the electronic device. When the electronic device is in a flattened state, there can also be a large distance between the first radiator and the second radiator, so that the first radiator and the second radiator can have better isolation when they work independently. When the electronic device is in a folded state, the first radiator and the second radiator are close to each other, and a path formed by the electric field strength point coupling of the two radiators and another current path of the current strength point coupling cancel each other out, which can also enable the two radiators to obtain better isolation when they work independently.

[0020] In a possible implementation, the antenna device further includes a fourth tuning circuit, one end of the fourth tuning circuit is connected to the first ground point, and the other end is connected to the second ground point. The fourth tuning circuit is helpful for adjusting the efficiency pit of the second radiator, so that the second radiator and the first radiator have good isolation.

[0021] In a possible implementation, the fourth tuning circuit includes a capacitor and / or an inductor and / or a radio frequency switch, which is used to adjust the efficiency pit of the second radiator. In a possible implementation, the fourth tuning circuit can be adjusted in coordination with the second tuning circuit, which is conducive to improving the adjustment accuracy of the efficiency pit and can better match the isolation between the first radiator and the second radiator.

[0022] In a possible implementation, the antenna device further includes a parasitic branch, which is arranged on the same side of the first body as the side of the first radiator having the first open end, and has a first gap between the first open end; or, the parasitic branch is arranged on the side of the second radiator having the second open end, and has a first gap between the second open end. The first radiator and the second radiator have the same structure and are symmetrically arranged on the corresponding first body and the second body. The parasitic branch can attract current to create an asymmetric current path between two radiators with symmetrical structures and positions, so as to generate destructive current, improve the isolation of the two radiators during independent operation, and expand the bandwidth.

[0023] In a possible implementation manner, a frequency of a resonance point of the first resonance is higher than a frequency of a resonance point of the second resonance.

[0024] In a possible implementation, the minimum difference between the frequency of the first working frequency band and the frequency of the second working frequency band is less than or equal to 200MHz. If the first radiator and the second radiator adopt the same structure and are symmetrically arranged in the electronic device, then when the difference between the resonant frequencies of the two radiators is within 200MHz when the electronic device is folded, the isolation of the two radiators is poor and cannot have good radiation performance. In the present application, the resonant frequency of the second radiator can be adjusted to be the same as or adjacent to the resonant frequency of the first radiator through the first tuning circuit, and the difference in resonant frequency can be achieved within 200MHz. At the same time, by making the distance between the second open end and the first grounding point of the second radiator greater than the distance between the first open end and the grounding end of the first radiator, the current path cancellation can be achieved, and the isolation of the two radiators when the difference in resonant frequency is within 200MHz when working independently can be improved, thereby improving the radiation performance of the two radiators.

[0025] In a possible implementation, the difference between the resonance point frequency of the first resonance and the resonance point frequency of the second resonance is less than or equal to 200 MHz. That is, when the first radiator and the second radiator operate at the same frequency or adjacent frequency, good isolation can be obtained, and both radiators can exert good radiation performance.

[0026] In a possible implementation manner, a communication frequency band corresponding to the signal in the first working frequency band and the signal in the second working frequency band is between 2.3 GHz and 2.7 GHz.

[0027] In one possible implementation, the resonance point of the first resonance is within the range of 2.5 GHz to 2.7 GHz, and the resonance point of the second resonance is within the range of 2.4 GHz to 2.5 GHz. Alternatively, the resonance point of the first resonance is within the range of 2.4 GHz to 2.5 GHz, and the resonance point of the second resonance is within the range of 2.3 GHz to 2.4 GHz. Alternatively, the resonance point of the first resonance is within the range of 1710 MHz to 2170 MHz, and the resonance point of the second resonance is within the range of 1575 MHz to 1630 MHz. That is to say, in the antenna device provided in the present application, the two radiators can obtain good isolation when working independently in a large number of adjacent frequency bands, reflecting good radiation performance.

[0028] In a possible implementation, when the first radiator and the second radiator work at the same time, the first radiator generates the first resonance, and the second radiator generates the second resonance. That is, the first radiator and the second radiator can work together, that is, the first radiator can generate the first resonance when working, and the second radiator can generate the second resonance when working. In this coexistence state, the first radiator and the second radiator have good isolation and good radiation performance.

[0029] It should be understood that the foregoing general description and the following detailed description are exemplary only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0031] Figure 1 A schematic diagram of the structure of an electronic device provided in an embodiment of the present application;

[0032] Figure 2 A partial schematic diagram of an electronic device provided by an embodiment of the present application;

[0033] Figure 3 A topological diagram of an electronic device provided in the first embodiment of the present application;

[0034] Figure 4 for Figure 3 A local enlarged view at the positions of the first radiator and the second radiator;

[0035] Figure 5 A graph showing return loss and isolation of an antenna device provided in the first embodiment of the present application;

[0036] Figure 6 A partial schematic diagram of an electronic device provided in another embodiment of the present application;

[0037] Figure 7 A topological diagram of an electronic device provided in the second embodiment of the present application;

[0038] Figure 8 for Figure 7 A local enlarged view at the positions of the first radiator and the second radiator;

[0039] Fig. 9 A topological diagram of an electronic device provided in the third embodiment of the present application;

[0040] Fig.10 for Fig. 9 A local enlarged view at the positions of the first radiator and the second radiator;

[0041] Fig.11 A partial enlarged view of the electronic device provided in the fourth embodiment of the present application at the positions of the first radiator and the second radiator;

[0042] Fig.12 A return loss curve diagram of the antenna device provided in an embodiment of the present application in a magneto-electric coupling mode;

[0043] Fig.13 An efficiency curve diagram of the antenna device provided in an embodiment of the present application in a magneto-electric coupling mode;

[0044] Fig.14 A topological diagram of an electronic device provided in a fifth embodiment of the present application;

[0045] Fig.15 for Fig.14 A local enlarged view at the positions of the first radiator and the second radiator;

[0046] Fig.16 A return loss curve diagram of an antenna device in an electronic device in an electric parasitic mode provided in a fifth embodiment of the present application;

[0047] Fig.17 An efficiency curve of the first radiator in the antenna device provided in the fifth embodiment of the present application in an electric parasitic mode, and a comparison diagram of the efficiency curves in a coexistence mode;

[0048] Fig.18 An efficiency curve of the second radiator in the antenna device provided in the fifth embodiment of the present application in an electric parasitic mode, and a comparison diagram of the efficiency curves in a coexistence mode;

[0049] Fig.19 This is a partial enlarged view of the electronic device provided in the sixth embodiment of the present application at the positions of the first radiator and the second radiator.

[0050] Reference numerals:

[0051] 100-First ontology;

[0052] 110 - first floor;

[0053] 200- Second body;

[0054] 210 - second floor;

[0055] 300-display screen;

[0056] 400-rotating shaft;

[0057] 1- the first radiator;

[0058] 11- ground terminal;

[0059] 12-first open end;

[0060] 13- a first feeding circuit;

[0061] 14- first feeding point;

[0062] 15- third tuning circuit;

[0063] 2- Second radiator;

[0064] 21- first grounding point;

[0065] 22A-second open end;

[0066] 22B - third open end;

[0067] 23- second feeding circuit;

[0068] 24- second feeding point;

[0069] 25- grounding point;

[0070] 26-a first tuning circuit;

[0071] 27- a second tuning circuit;

[0072] 28-Fourth tuning circuit.

[0073] 3- Parasitic branches;

[0074] 31-First gap. DETAILED DESCRIPTION

[0075] In order to better understand the technical solution of the present application, the embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0076] It should be clear that the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0077] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. The singular forms "a", "said" and "the" used in the embodiments of the present application and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings.

[0078] It should be understood that the term "and / or" used in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0079] In the description of this application, unless otherwise clearly specified and limited, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance; unless otherwise specified or explained, the term "plurality" refers to two or more; the terms "connected" and "fixed" should be understood in a broad sense, for example, "connected" can be a fixed connection, a detachable connection, an integral connection, or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0080] Radiator, or antenna branch: is a device in the antenna used to receive / send electromagnetic wave radiation. In some cases, the narrow sense of "antenna" is to be understood as a radiator, which converts the waveguide energy from the transmitter into radio waves, or converts radio waves into waveguide energy, which is used to radiate and receive radio waves. The modulated high-frequency current energy (or waveguide energy) generated by the transmitter is transmitted to the transmitting radiator via the feeder line, and is converted into a certain polarized electromagnetic wave energy by the radiator and radiated in the desired direction. The receiving radiator converts a certain polarized electromagnetic wave energy from a specific direction in space into modulated high-frequency current energy, which is transmitted to the receiver input via the feeder line.

[0081] The radiator (or antenna branch) may include a conductor with a specific shape and size, such as a linear or sheet shape, etc. The present application does not limit the specific shape. In one embodiment, the linear radiator may be referred to as a linear antenna. In one embodiment, the linear radiator may be implemented by a conductive frame, and may also be referred to as a frame antenna. In one embodiment, the linear radiator may be implemented by a bracket conductor, and may also be referred to as a bracket antenna. In one embodiment, the linear radiator, or the radiator of the linear antenna, has a wire diameter (e.g., including thickness and width) much smaller than the wavelength (e.g., the dielectric wavelength) (e.g., less than 1 / 16 of the wavelength), and a length comparable to the wavelength (e.g., the dielectric wavelength) (e.g., the length is about 1 / 8 of the wavelength, or 1 / 8 to 1 / 4, or 1 / 4 to 1 / 2, or longer). The main forms of linear antennas include dipole antennas, half-wave oscillator antennas, monopole antennas, loop antennas, and inverted F antennas (also known as IFA, Inverted F Antenna). For example, for a dipole antenna, each dipole antenna generally includes two radiating branches, and each branch is fed by a feeding unit from the feeding end of the radiating branch. For example, an inverted-F antenna (IFA) can be regarded as a monopole antenna with a ground path added. The IFA antenna has a feeding point and a grounding point, and is called an inverted F antenna because its side view is an inverted F shape. In one embodiment, the sheet radiator may include a microstrip antenna, or a patch antenna, such as a planar inverted F antenna (also known as PIFA, Planar Inverted F Antenna). In one embodiment, the sheet radiator may be implemented by a planar conductor (such as a conductive sheet or a conductive coating, etc.). In one embodiment, the sheet radiator may include a conductive sheet, such as a copper sheet, etc. In one embodiment, the sheet radiator may include a conductive coating, such as a silver paste, etc. The shape of the sheet radiator includes a circle, a rectangle, a ring, etc., and the present application does not limit the specific shape. The structure of the microstrip antenna is generally composed of a dielectric substrate, a radiator and a floor, wherein the dielectric substrate is arranged between the radiator and the floor.

[0082] The radiator (or antenna branch) may also include a slot or a slit formed on the conductor, for example, a closed or semi-closed slot or slit formed on the grounded conductor surface. In one embodiment, a slotted or slitted radiator may be referred to as a slot antenna or a slot antenna. In one embodiment, the radial dimension (for example, including the width) of the slot or slit of the slot antenna / slot antenna is much smaller than the wavelength (for example, the dielectric wavelength) (for example, less than 1 / 16 of the wavelength), and the length dimension may be comparable to the wavelength (for example, the dielectric wavelength) (for example, the length is about 1 / 8 of the wavelength, or 1 / 8 to 1 / 4, or 1 / 4 to 1 / 2, or longer). In one embodiment, a radiator with a closed slot or slit may be referred to as a closed slot antenna. In one embodiment, a radiator with a semi-closed slot or slit (for example, an opening is added to a closed slot or slit) may be referred to as an open slot antenna. In some embodiments, the slot shape is a long strip. In some embodiments, the length of the slot is about half a wavelength (for example, the dielectric wavelength). In some embodiments, the length of the slot is about an integer multiple of the wavelength (for example, one times the dielectric wavelength). In some embodiments, the slot can be fed by a transmission line connected across one or both sides thereof, thereby exciting a radio frequency electromagnetic field on the slot and radiating electromagnetic waves into space. In one embodiment, the radiator of the slot antenna or slot antenna can be realized by a conductive frame with both ends grounded, which can also be called a frame antenna; in this embodiment, it can be regarded as that the slot antenna or slot antenna includes a linear radiator, which is spaced apart from the floor and grounded at both ends of the radiator, thereby forming a closed or semi-closed slot or slot. In one embodiment, the radiator of the slot antenna or slot antenna can be realized by a bracket conductor with both ends grounded, which can also be called a bracket antenna.

[0083] Coupling: can be understood as direct coupling and / or indirect coupling, and "coupled connection" can be understood as direct coupling connection and / or indirect coupling connection. Direct coupling can also be called "electrical connection", which is understood as the physical contact and electrical conduction between components; it can also be understood as the connection between different components in the circuit structure through physical lines such as printed circuit board (PCB) copper foil or wires that can transmit electrical signals; "indirect coupling" can be understood as two conductors being electrically conductive in an airless / non-contact manner. In one embodiment, indirect coupling can also be called capacitive coupling, for example, signal transmission is achieved by coupling between the gaps between two conductive parts to form an equivalent capacitor.

[0084] Resonant frequency: The resonant frequency is also called the resonance frequency. The resonant frequency can have a frequency range, that is, the frequency range in which resonance occurs. The resonant frequency can be a frequency range in which the return loss characteristic is less than -6dB. The strongest point of resonance can be called the resonance point, and the frequency corresponding to the resonance point is the center frequency point frequency. The return loss characteristic of the center frequency can be less than -20dB. It should be understood that, unless otherwise specified, the antenna / radiator mentioned in this application produces a "first / second... resonance", where the first resonance should be the fundamental mode resonance generated by the antenna / radiator, or the lowest frequency resonance generated by the antenna / radiator. It should be understood that the antenna / radiator can generate one or more antenna modes according to the specific design, and each antenna mode can correspond to a fundamental mode resonance.

[0085] Resonant frequency band: The range of the resonant frequency is the resonant frequency band. The return loss characteristic of any frequency point in the resonant frequency band can be less than -6dB or -5dB.

[0086] Communication frequency band / working frequency band: Regardless of the type of antenna, it always works within a certain frequency range (band width). For example, an antenna that supports the B40 frequency band has a working frequency band that includes frequencies in the range of 2300MHz to 2400MHz, or in other words, the working frequency band of the antenna includes the B40 frequency band. The frequency range that meets the index requirements can be regarded as the working frequency band of the antenna. The width of the working frequency band is called the working bandwidth. The working bandwidth of an omnidirectional antenna may reach 3-5% of the center frequency. The working bandwidth of a directional antenna may reach 5-10% of the center frequency. The bandwidth can be considered as a frequency range on both sides of the center frequency (for example, the resonant frequency of a dipole), where the antenna characteristics are within the acceptable value range of the center frequency.

[0087] The resonant frequency band and the operating frequency band may be the same, or may partially overlap. In one embodiment, one or more resonant frequency bands of the antenna may cover one or more operating frequency bands of the antenna.

[0088] Wavelength: or operating wavelength, which can be the wavelength corresponding to the center frequency of the resonant frequency or the center frequency of the operating frequency band supported by the antenna. For example, assuming that the center frequency of the B1 uplink frequency band (resonant frequency is 1920MHz to 1980MHz) is 1955MHz, then the operating wavelength can be the wavelength calculated using the frequency of 1955MHz. Not limited to the center frequency, "operating wavelength" can also refer to the wavelength corresponding to the non-center frequency of the resonant frequency or the operating frequency band.

[0089] It should be understood that the wavelength of the radiation signal in the air can be calculated as follows: (wavelength in air, or wavelength in vacuum) = speed of light / frequency, where frequency is the frequency of the radiation signal (MHz), and the speed of light can be taken as 3×108 m / s. The wavelength of the radiation signal in the medium can be calculated as follows: Among them, ε is the relative dielectric constant of the medium. The wavelength in the embodiments of the present application generally refers to the dielectric wavelength, which can be the dielectric wavelength corresponding to the center frequency of the resonant frequency, or the dielectric wavelength corresponding to the center frequency of the working frequency band supported by the antenna. For example, assuming that the center frequency of the B1 uplink frequency band (resonant frequency is 1920MHz to 1980MHz) is 1955MHz, the wavelength can be the dielectric wavelength calculated using the frequency of 1955MHz. Not limited to the center frequency, "dielectric wavelength" may also refer to the dielectric wavelength corresponding to the non-center frequency of the resonant frequency or the working frequency band. For ease of understanding, the dielectric wavelength mentioned in the embodiments of the present application can be simply calculated by the relative dielectric constant of the medium filled on one or more sides of the radiator.

[0090] End / point: The "end / point" in the first end / second end / feeding end / grounding end / feeding point / grounding point / connection point of the antenna radiator cannot be narrowly understood as an end point or end portion that is physically disconnected from other radiators, but can also be considered as a point or a section on a continuous radiator. In one embodiment, the "end / point" may include a connection / coupling area on the antenna radiator that is coupled to other conductive structures. For example, the feed end / feeding point may be a coupling area on the antenna radiator that is coupled to the feed structure (for example, an area facing a portion of the feed structure). For another example, the ground end / grounding point may be a connection / coupling area on the antenna radiator that is coupled to the ground structure.

[0091] Open end, grounded end: In some embodiments, the open end and the grounded end are, for example, relative to whether they are grounded. The grounded end is grounded, and the open end is not grounded. In some embodiments, the open end and the grounded end are, for example, relative to other conductors. The grounded end is electrically connected to other conductors, and the open end is not electrically connected to other conductors. In one 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 one embodiment, the grounded 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 and connected through the open end to transfer coupling energy (which can be understood as transferring current).

[0092] The feed circuit is a combination of all circuits used for receiving and transmitting radio frequency signals. The feed circuit may include a transceiver and an RF front end circuit. In some cases, the "feed circuit" is understood in a narrow sense as a radio frequency chip (RFIC, Radio Frequency Integrated Circuit), and RFIC can be considered to include an RF front end chip and a transceiver. The feed circuit has the function of converting radio waves (e.g., radio frequency signals) and electrical signals (e.g., digital signals). Generally, it is considered to be part of the radio frequency.

[0093] In some embodiments, the electronic device may further include a test socket (or referred to as a radio frequency socket or a radio frequency test socket). The test socket may be used to insert a coaxial cable to test the characteristics of the radio frequency front-end circuit or the radiator of the antenna through the cable. The radio frequency front-end circuit may be considered as a circuit portion coupled between the test socket and the transceiver.

[0094] In some embodiments, the RF front-end circuit may be integrated into a RF front-end chip in the electronic device, or the RF front-end circuit and the transceiver may be integrated into a RF chip in the electronic device.

[0095] It should be understood that any two of the first / second / …Nth feeding circuits in the present application can share the same transceiver, for example, transmitting signals through a RF channel in a transceiver (for example, a port (pin) of a RF chip); they can also share a RF front-end circuit, for example, processing signals through a switch or amplifier in a RF front-end.

[0096] It should also be understood that two feeding circuits in the first / second / ...Nth feeding circuits in the present application usually correspond to two radio frequency test sockets in the electronic device.

[0097] The tuning circuit is a circuit related to adjusting the resonant frequency of the antenna. In one embodiment, the tuning circuit is coupled between the radiator and the floor. In one embodiment, the tuning circuit is coupled between the feeding circuit and the radiator. In one embodiment, the tuning circuit has the function of impedance matching and / or frequency tuning. Generally, it is considered to be a part of the antenna.

[0098] In one embodiment, the tuning circuit may include a switch and / or an electronic component / device, and the switch may be an electronic component / device for switching the coupling connection of the radiator. The switch in the tuning circuit may also be referred to as an antenna switch.

[0099] Ground / floor: can refer to at least a part of any grounding layer, grounding plate, or grounding metal layer in an electronic device (such as a mobile phone), or at least a part of any combination of any of the above grounding layers, grounding plates, or grounding components, etc., and "ground / floor" can be used for grounding components in electronic devices. In one embodiment, "ground / floor" can include any one or more of the following: the grounding layer of the circuit board of the electronic device, the grounding plate formed by the middle frame of the electronic device, the grounding metal layer formed by the metal film under the screen, the conductive grounding layer of the battery, and the conductive parts or metal parts electrically connected to the above grounding layer / grounding plate / metal layer. In one embodiment, the circuit board can be a printed circuit board (PCB), such as an 8-layer, 10-layer or 12-14-layer board with 8, 10, 12, 13 or 14 layers of conductive materials, or an element separated and electrically insulated by a dielectric layer or insulating layer such as glass fiber, polymer, etc. In one embodiment, the circuit board includes a dielectric substrate, a grounding layer and a wiring layer, and the wiring layer and the grounding layer are electrically connected through vias. In one embodiment, components such as a display, a touch screen, input buttons, a transmitter, a processor, a memory, a battery, a charging circuit, a system on chip (SoC) structure, etc. can be mounted on or connected to a circuit board; or electrically connected to a wiring layer and / or a ground layer in the circuit board. For example, a radio frequency source is disposed on the wiring layer.

[0100] Any of the above-mentioned grounding layers, grounding plates, or grounding metal layers are made of conductive materials. In one embodiment, the conductive material can be any of the following materials: 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 and tin-plated copper on an insulating substrate, cloth impregnated with graphite powder, graphite-coated substrates, copper-plated substrates, brass-plated substrates, and aluminum-plated substrates. It will be appreciated by those skilled in the art that the grounding layer / grounding plate / grounding metal layer can also be made of other conductive materials.

[0101] Grounding: refers to coupling with the above-mentioned ground / floor through a grounding structure and / or a grounding circuit. In one embodiment, grounding can be achieved through physical grounding, such as physical grounding (or physical ground) at a specific position on the frame through some structural members of the middle frame. In one embodiment, grounding can be achieved through device grounding, such as grounding through devices such as capacitors / inductors / resistors connected in series or in parallel (or device ground).

[0102] In the design of foldable terminal products, some models have antennas on both sides of the hinge. When the phone is folded, the antennas on both sides of the hinge are close to each other, which will cause the isolation and antenna performance to deteriorate when the two antennas work independently. In order to reduce the impact of isolation, such two antennas need to work at low frequencies and medium and high frequencies respectively, and cannot work at the same frequency or with a small frequency difference.

[0103] Antenna system efficiency: refers to the ratio of the power radiated by the antenna into space (i.e. the power of the electromagnetic wave part that is effectively converted) to the input power of the antenna. The system efficiency is the actual efficiency after considering the matching of the antenna port, that is, the system efficiency of the antenna is the actual efficiency (i.e. efficiency) of the antenna.

[0104] Antenna radiation efficiency: refers to the ratio of the power radiated by the antenna into space (i.e. the power of the electromagnetic wave part that is effectively converted) to the active power input to the antenna. Among them, the active power input to the antenna = the input power of the antenna - the loss power; the loss power mainly includes the return loss power and the ohmic loss power of the metal and / or the dielectric loss power. The radiation efficiency is a value that measures the radiation ability of the antenna. Metal loss and dielectric loss are both factors that affect the radiation efficiency.

[0105] Those skilled in the art can understand that efficiency is generally expressed as a percentage, and there is a corresponding conversion relationship between efficiency and dB. The closer the efficiency is to 0 dB, the better the efficiency of the antenna.

[0106] Antenna return loss: It can be understood as the ratio of the signal power reflected back to the antenna port through the antenna circuit to the transmit power of the antenna port. The smaller the reflected signal, the larger the signal radiated into space through the antenna, and the greater the radiation efficiency of the antenna. The larger the reflected signal, the smaller the signal radiated into space through the antenna, and the lower the radiation efficiency of the antenna.

[0107] Antenna return loss can be expressed by the S11 parameter, which is one of the S parameters. S11 represents the reflection coefficient, which can characterize the quality of the antenna transmission efficiency.

[0108] In one embodiment, the S11 diagram can be understood as a schematic diagram for representing the resonance generated by the antenna. In one embodiment, the resonance shown in the S11 diagram in the portion less than -6dB can be understood as the resonant frequency / frequency range / operating frequency band generated by the antenna. The S11 parameter is usually a negative number. The smaller the S11 parameter is, the smaller the antenna return loss is, and the smaller the energy reflected back by the antenna itself is, which means that more energy actually enters the antenna and the higher the system efficiency of the antenna is; the larger the S11 parameter is, the greater the antenna return loss is, and the lower the system efficiency of the antenna is.

[0109] It should be noted that in engineering, the S11 value is generally -6dB as the standard. When the S11 value of an antenna is less than -6dB, it can be considered that the antenna can work normally, or that the antenna has good transmission efficiency.

[0110] Antenna isolation: refers to the ratio of the signal received by another antenna when one antenna transmits a signal to the signal of the transmitting antenna. Isolation is a physical quantity used to measure the degree of antenna mutual coupling. Assuming that the two antennas form a two-port network, the isolation between the two antennas is the S21 and S12 between the antennas. Antenna isolation can be represented by the S21 and S12 parameters. The S21 and S12 parameters are usually negative numbers. The smaller the S21 and S12 parameters are, the greater the isolation between the antennas and the smaller the degree of antenna mutual coupling; the larger the S21 and S12 parameters are, the smaller the isolation between the antennas and the greater the degree of antenna mutual coupling. Antenna isolation depends on the antenna radiation pattern, the spatial distance between the antennas, the antenna gain, etc.

[0111] The technical solution provided in the embodiment of the present application is applicable to electronic devices 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 electronic device in the embodiment of the present application can be a foldable electronic device, such as a foldable mobile phone, a foldable tablet computer, a foldable smart home, etc. The embodiment of the present application is not limited to this. Figure 1 An electronic device provided in an embodiment of the present application is exemplarily shown, and the electronic device is described as a foldable mobile phone.

[0112] Reference Figure 1 The electronic device includes a first body 100, a second body 200 and a rotating shaft 400. The first body 100 and the second body 200 are respectively arranged on both sides of the rotating shaft 400 and are rotatably connected to the rotating shaft 400. Figure 2 A partial schematic diagram of an electronic device provided by an embodiment of the present application, referring to Figure 2, the first body 100 includes a first floor 110, and the second body 200 includes a second floor 210. Among them, the first floor 110 and the second floor 210 can be printed circuit boards, and the first floor 110 and the second floor 210 can be used to install and support various components and provide electrical connection functions. The first body 100, the second body 200 and the rotating shaft 400 can constitute a foldable electronic device such as a foldable mobile phone, a foldable tablet computer, etc. These devices include a display screen 300, and the display screen 300 can be covered on the first body 100, the second body 200 and the rotating shaft 400 for display. In one embodiment, the first body 100 and the second body 200 can both include a metal middle frame, a metal frame, etc. of the electronic device, or can be used as a shell of the electronic device. In one embodiment, the electronic device provided in this embodiment also includes an antenna device, and the first radiator 1 in the antenna device can be arranged on the first body 100, and the second radiator 2 in the antenna device is arranged on the second body 200. When the electronic device is in an unfolded state or a folded state, the two radiators can work as two independent antennas. Of course, when the electronic device is in a folded state, one of the two radiators can serve as a parasitic branch 3 of the other, so that the two radiators form an antenna to work.

[0113] In one embodiment, Figure 3 A topological diagram of an electronic device provided in an embodiment of the present application, referring to Figure 3 The antenna device includes a first radiator 1, a first feeding circuit 13, a second radiator 2 and a second feeding circuit 23. The first radiator 1 can be disposed on the first body 100 and can move synchronously with the first body 100. Figure 4 for Figure 3 The local enlarged view at the position of the first radiator 1 and the second radiator 2, refer to Figure 4 , the first radiator 1 is provided with a grounding terminal 11 and a first open end 12, and the grounding terminal 11 is coupled and connected to the first floor 110 for grounding. In one embodiment, the grounding terminal 11 can be directly connected to the first floor 110. In one embodiment, the grounding terminal 11 can also be indirectly connected to the first floor 110 through devices such as capacitors, inductors, and radio frequency switches. In one embodiment, the grounding terminal 11, the first radiator 1, and at least a portion of the first floor 110 can be integrally formed, so as to achieve field grounding (compared to device grounding) through a simplified process. In one embodiment, the middle frame of an electronic device such as a mobile phone can be an integrally formed structure, and part of the middle frame can be reused as the first radiator 1, the grounding terminal 11, and the first floor 110 in this application. In one embodiment, the first floor 110 can be the middle plate portion of the middle frame in an electronic device such as a mobile phone.

[0114] The first open end 12 is not in contact with the first floor 110. The first radiator 1 includes a first feeding point 14, and the first feeding circuit 13 is coupled to the first radiator 1 through the first feeding point 14, and is used to feed a signal of the first working frequency band to the first radiator 1, and the first radiator 1 is used to generate a first resonance corresponding to the first working frequency band.

[0115] The second radiator 2 can be disposed on the second body 200 and can move synchronously with the second body 200. Figure 4 The second radiator 2 is provided with a first grounding point 21, a second open end 22A and a third open end 22B. The first grounding point 21 is located between the second open end 22A and the third open end 22B. The first grounding point 21 is coupled to the second floor 210 for grounding. The first grounding point 21 can be directly connected to the second floor 210, or can be indirectly connected to the second floor 210 through a device. Neither the second open end 22A nor the third open end 22B is in contact with the second floor 210. The second radiator 2 includes a second feeding point 24. The second feeding circuit 23 is coupled to the second radiator 2 through the second feeding point 24, and is used to feed a signal of a second working frequency band to the second radiator 2. The second radiator 2 is used to generate a second resonance corresponding to the second working frequency band. The second working frequency band is the same as or adjacent to the first working frequency band. In one embodiment, the frequency of the resonance point of the first resonance is higher than the frequency of the resonance point of the second resonance.

[0116] In one embodiment, as described above, the first body 100 and the second body 200 may both include a metal middle frame, a metal frame, etc. of an electronic device, and the first radiator 1 and the second radiator 2 may reuse the frame of the electronic device, that is, a part of the frame of the electronic device may be used as the first radiator 1 and the second radiator 2, thereby reducing the space occupied by the radiator in the electronic device, which is conducive to the miniaturization design of the electronic device. In another embodiment, the first body 100 and the second body 200 both include a shell, which may be a plastic shell or a metal shell, or a shell formed by providing a metal layer in a plastic shell, and the first radiator 1 and the second radiator 2 may both be provided in the shell. Among them, when the internal space of the electronic device is large enough, the antenna device may be installed as a whole inside the shell, thereby facilitating the disassembly and maintenance of the antenna device.

[0117] When the electronic device is in the unfolded state, the first radiator 1 and the second radiator 2 are far apart, so that good isolation can be obtained, and each can work normally independently. When the electronic device is in the folded state, the first body 100 and the second body 200 are aligned with each other, and the first radiator 1 and the second radiator 2 are close to each other. If the first radiator 1 and the second radiator 2 have the same structure and size specifications, for example, the electrical lengths of the two radiators are 1 / 4 λ, λ is the wavelength. When the two antennas work at the same frequency or adjacent frequency, the isolation between the two antennas is poor, and the radiation performance of the radiator is poor, so it is impossible to realize the normal independent operation of the two antennas in the folded state of the electronic device. In this case, in order to maximize the isolation between the two radiators and meet the radiation performance when the two radiators work independently, the two radiators are usually made to work in different frequency bands with a large frequency difference. For example, one radiator works in the low frequency band and the other radiator works in the medium and high frequency band, which imposes a large restriction on the working frequency band of the antenna.

[0118] To this end, in one embodiment, referring to Figure 4, the antenna device also includes a first tuning circuit 26, one end of which can be coupled to the second radiator 2. In one embodiment, one end of the first tuning circuit 26 can be coupled to a position on the second radiator 2 close to the second feeding point 24. In one embodiment, one end of the first tuning circuit 26 can be coupled to the second feeding point 24, for example, a common spring (usually referred to as a feeding spring) is used to achieve electrical connection with the second radiator 2. The other end of the first tuning circuit 26 is coupled to the second floor 210, and is used to adjust the second resonance generated by the second radiator 2 to a second working frequency band that is the same as or adjacent to the first working frequency band, so that the first radiator 1 and the second radiator 2 operate at the same frequency or adjacent frequencies. The ratio of the length of the second radiator 2 between the third open end 22B and the second open end 22A to the length of the first radiator 1 between the ground end 11 and the first open end 12 is greater than 1 and less than or equal to 2. When the electronic device is in a folded state, the projections of the first open end 12 and the second open end 22A along the thickness direction of the electronic device at least partially overlap, and the projection of the ground end 11 is located between the projection of the third open end 22B and the projection of the second open end 22A, wherein “located between the projection of the third open end 22B and the projection of the second open end 22A” should be understood as the projection of the ground end 11 does not overlap with the projection of the third open end 22B and the projection of the second open end 22A. Among them, when the first feeding circuit 13 feeds the first radiator 1 through the first feeding point 14, and the second feeding circuit 23 feeds the second radiator 2 through the second feeding point 24, electric field strength points can be formed at the first open end 12 and the second open end 22A, and because the projections of the first open end 12 and the second open end 22A along the thickness direction of the electronic device at least partially overlap, the electric field strength points of the first open end 12 and the electric field strength points of the second open end 22A can be coupled with each other, and a first current path is generated. At the same time, the grounding end 11 of the first radiator 1 and the first grounding point 21 of the second radiator 2 are respectively current strength points, and the current strength points of the two radiators can be coupled to form a second current path, and the directions of the first current path and the second current path are opposite to each other. Therefore, when the first current path and the second current path meet the phase cancellation condition, it can be achieved that the two radiators can obtain good isolation when working in the same frequency band or adjacent frequency bands, so that the two radiators can work normally independently when the electronic device is folded. The first tuning circuit 26 may include a capacitor or an inductor, or may be composed of a capacitor and an inductor, or may include a radio frequency switch, and the radio frequency switch has multiple branches, and each branch may be connected to a capacitor or an inductor. The first tuning circuit 26 may adjust the resonant frequency of the second radiator 2 to increase the resonant frequency of the second radiator 2, so that the resonant frequency of the second radiator 2 is the same as or adjacent to the resonant frequency of the first radiator 1.

[0119] Figure 5The return loss and isolation curve of the antenna device provided in the first embodiment of the present application is shown in FIG. Figure 5 , curve a1 is the return loss curve of the first radiator 1, curve a2 is the isolation curve of the first radiator 1, curve b1 is the return loss curve of the second radiator 2, and curve b2 is the isolation curve of the second radiator 2. It can be seen from curves a1 and b1 that the first radiator 1 and the second radiator 2 operate in the same resonant frequency band (near 2.04 GHz), and it can be seen from curves a2 and b2 that curve a2 and curve b2 almost overlap, and the isolation is below -15 dB, which has good isolation. Therefore, the antenna device provided in the embodiment of the present application can achieve good isolation when the first radiator 1 and the second radiator 2 work independently when the electronic device is in a folded state. In one embodiment, referring to Figure 2 , the first radiator 1 is arranged on a side of the first body 100 away from the rotation axis 400, and the second radiator 2 is arranged on a side of the second body 200 away from the rotation axis 400. When the electronic device is in a flattened state, there is a large distance between the first radiator 1 and the second radiator 2, so that the first radiator 1 and the second radiator 2 can have better isolation when they work independently. When the electronic device is in a folded state, the first radiator 1 and the second radiator 2 are close to each other, and a path formed by the electric field strength point coupling of the two radiators and another current path formed by the current strength point coupling cancel each other out, so that the two radiators can also obtain better isolation when they work independently.

[0120] In another embodiment, Figure 6 A partial schematic diagram of an electronic device provided in another embodiment of the present application, referring to Figure 6 , the first radiator 1 is arranged on a side of the first body 100 adjacent to the rotation axis 400, and the second radiator 2 is arranged on a side of the second body 200 adjacent to the rotation axis 400, and in the axial direction of the rotation axis 400, the first radiator 1 and the second radiator 2 are both located on the same side of the electronic device. When the electronic device is in a flattened state, there can also be a large distance between the first radiator 1 and the second radiator 2, so that the first radiator 1 and the second radiator 2 can have better isolation when they work independently. When the electronic device is in a folded state, the first radiator 1 and the second radiator 2 are close to each other, and a path formed by the electric field strength point coupling of the two radiators and another current path of the current strength point coupling cancel each other out, and better isolation can also be obtained between the two radiators when they work independently.

[0121] In one embodiment, referring to Figure 4, the distance between the first feeding point 14 and the first open end 12 can be less than 7.5mm, and the distance between the second feeding point 24 and the second open end 22A can also be less than 7.5mm. Thus, the first feeding point 14 can be made closer to the first open end 12, and the second feeding point 24 can be made closer to the second open end 22A, so that the first radiator 1 forms an electric field strength point at the first open end 12, and the second radiator 2 forms an electric field strength point at the second open end 22A. When the electronic device is in a folded state, the electric field strength point of the first radiator 1 and the electric field strength point of the second radiator 2 can couple with each other to form a current path, so that the current path can be offset by another current path formed by coupling the ground ends of the two radiators, thereby improving the isolation of the two radiators when working independently. In a possible implementation, the electrical length between the first feeding point 14 and the first open end 12 is less than 1 / 8 λ, λ is a wavelength corresponding to the first working frequency range, and the electrical length between the second feeding point 24 and the second open end 22A is less than 1 / 8 λ, λ is a wavelength corresponding to the second working frequency band. Thus, the first feeding point 14 can be made closer to the first open end 12, and the second feeding point 24 can be made closer to the second open end 22A, which will not be described in detail here.

[0122] In one embodiment, when the first radiator 1 and the second radiator 2 operate in the same frequency band, the frequency band may be a communication frequency band between 2.3 GHz and 2.7 GHz. When the first radiator 1 and the second radiator 2 operate in adjacent frequency bands, the minimum difference between the frequency of the signal in the aforementioned first operating frequency band and the frequency of the signal in the second operating frequency band is greater than 0 and less than or equal to 200 MHz. That is, the difference between the lowest value of the first operating frequency band and the highest value of the second operating frequency band is less than or equal to 200 MHz. In one embodiment, the difference between the resonance point frequency of the first resonance and the resonance point frequency of the second resonance is less than or equal to 200 MHz. In one embodiment, the resonance point of the aforementioned first resonance is in the range of 2.5 GHz to 2.7 GHz (cellular B41 frequency band), and the resonance point of the second resonance is in the range of 2.4 GHz to 2.5 GHz (Wi-Fi 2.4G). Alternatively, the resonance point of the first resonance is within the range of 2.4 GHz to 2.5 GHz (Wi-Fi 2.4G), and the resonance point of the second resonance is within the range of 2.3 GHz to 2.4 GHz (cellular B40 band). Alternatively, the resonance point of the first resonance is within the range of 1710 MHz to 2170 MHz (cellular B3 band), and the resonance point of the second resonance is within the range of 1575 MHz to 1630 MHz (GPS).

[0123] In one embodiment, since the length of the second radiator 2 between the third open end 22B and the second open end 22A is greater than the length of the first radiator 1 between the ground end 11 and the first open end 12, when no device is used to adjust the frequency, the resonant frequency of the second radiator 2 with a relatively long length is lower than the resonant frequency of the first radiator 1 with a relatively short length. Figure 7 A topological diagram of an electronic device provided in the second embodiment of the present application, Figure 8 for Figure 7 The local enlarged view at the position of the first radiator 1 and the second radiator 2, refer to Figure 8 In order to realize the first radiator 1 and the second radiator 2 to work at the same frequency, the second radiator 2 includes a second grounding point 25, which is arranged between the first grounding point 21 and the second feeding point 24, and the second grounding point 25 is a position on the second radiator 2 for grounding. The antenna device also includes a second tuning circuit 27, one end of the second tuning circuit 27 is connected to the second grounding point 25, and the other end is connected to the second floor 210 for grounding. The second tuning circuit 27 may include a capacitor or an inductor, or may be composed of a combination of a capacitor and an inductor, or may include a radio frequency switch, and the radio frequency switch has a plurality of branches, and each branch may be connected to a capacitor or an inductor. The second tuning circuit 27 may adjust the efficiency pit of the second radiator 2, so that the efficiency pit of the second radiator 2 becomes shallower or moves out of the band, so that there is a higher isolation between the two radiators, so that both radiators can obtain better antenna performance.

[0124] In one embodiment, when the electronic device is in a folded state, along the thickness direction of the electronic device, the projection of the ground terminal 11 is at least partially located between the projection of the first ground point 21 and the projection of the second ground point 25. In one embodiment, the projection of the ground terminal 11 can be completely located between the projection of the first ground point 21 and the projection of the second ground point 25, and there is no overlap with the projection of the first ground point 21 and the projection of the second ground point 25. In another embodiment, at least part of the projection of the ground terminal 11 can overlap with the projection of the first ground point 21 and / or the projection of the second ground point 25. Among them, the ground terminal 11, the first ground point 21 and the second ground point 25 are staggered from each other, so that the return paths of the ground terminal 11 and the first ground point 21 are different, which is conducive to improving the isolation between the first radiator 1 and the second radiator 2 when they are working. At the same time, making the return paths of the ground terminal 11 and the second grounding point 25 different is conducive to adjusting the frequency through the second tuning circuit 27 connected to the second grounding point 25, so that the current paths of the first radiator 1 and the second radiator 2 meet the phase cancellation condition, so that better isolation can be obtained when the first radiator 1 and the second radiator 2 work separately in the folded state of the electronic device.

[0125] In one embodiment, the electrical length of the first radiator 1 between the ground end 11 and the first open end 12 is 1 / 4 λ, λ is a wavelength corresponding to the first working frequency band. The first radiator 1 with this electrical length can obtain better signal receiving and transmitting quality and has a smaller structural size, which is conducive to realizing the miniaturization design of the antenna device.

[0126] In one embodiment, the electrical length of the second radiator 2 between the third open end 22B and the second open end 22A is between 1 / 4 λ~ 1 / 2 λ, λ is the wavelength corresponding to the second working frequency band. The second radiator 2 has a larger electrical length than the first radiator 1, which is beneficial to improve the isolation between the first radiator 1 and the second radiator 2 when they work independently, and can ensure that the second radiator 2 obtains better signal receiving and sending quality, which is also beneficial to achieve structural miniaturization.

[0127] In one embodiment, Fig. 9 A topological diagram of an electronic device provided in the third embodiment of the present application, Fig.10 for Fig. 9 The local enlarged view at the position of the first radiator 1 and the second radiator 2, refer to Fig.10 , the antenna device further includes a third tuning circuit 15, one end of which is connected to the first radiator 1. In one embodiment, one end of the third tuning circuit 15 can be coupled to the position of the first radiator 1 close to the first feeding point 14. In one embodiment, one end of the third tuning circuit 15 can be coupled to the first feeding point 14. The other end of the third tuning circuit 15 is connected to the first ground 110, that is, the first radiator 1 is grounded at the first feeding point 14 through the third tuning circuit 15. The third tuning circuit 15 can have a similar structure to the aforementioned first tuning circuit 26, that is, the third tuning circuit 15 can also include a capacitor or an inductor, or can be composed of a combination of a capacitor and an inductor, or include a radio frequency switch, and the radio frequency switch has multiple branches, and a capacitor or an inductor can be connected to each branch. The third tuning circuit 15 can adjust the resonant frequency of the first radiator 1 to the corresponding first working frequency band. In addition, in some other embodiments, the third tuning circuit 15 may not be configured, and this embodiment is not limited to this.

[0128] In one embodiment, a third tuning circuit 15 can be configured for the first radiator 1, and a first tuning circuit 26 can be configured for the second radiator 2. The resonant frequencies of the first radiator 1 and the second radiator 2 can be made the same or adjacent by jointly adjusting the first tuning circuit 26 and the third tuning circuit 15, thereby facilitating the adjustment of the resonant frequency and enabling the first radiator 1 and the second radiator 2 to work independently at the same frequency or adjacent frequencies with high isolation.

[0129] In one embodiment, for the first radiator 1 and the second radiator 2 constituting a cellular antenna, the cellular antenna can support B1, B3, and B7 frequency bands. To facilitate the adjustment of the operating frequency, the first tuning circuit 26, the second tuning circuit 27, and the third tuning circuit 15 can all include adjustable devices such as a radio frequency switch. During the adjustment process, the first resonance of the first radiator 1 can be adjusted to the corresponding first operating frequency band through the third tuning circuit 15, and then the second tuning circuit 27 connected to the second grounding point 25 on the second radiator 2 can be adjusted. The efficiency pit of the second radiator 2 can be adjusted through the second tuning circuit 27, so that the efficiency pit of the second radiator 2 becomes shallower or moves out of the band, so that the second radiator 2 and the first radiator 1 have good isolation. Then the first tuning circuit 26 is adjusted so that the second resonance of the second radiator 2 is located in the corresponding second operating frequency band, and the second operating frequency band is the same as or adjacent to the first operating frequency band, so that the first radiator 1 and the second radiator 2 can have good isolation when they work independently at the same frequency or adjacent frequency, and can obtain good antenna performance.

[0130] In one embodiment, the first tuning circuit 26 may include a first inductor, and the third tuning circuit 15 may include a second inductor, that is, the first inductor is connected in parallel at the first feeding point 14, and the second inductor is connected in parallel at the second feeding point 24, and the inductance value of the first inductor is smaller than the inductance value of the second inductor, so as to facilitate adjusting the resonant frequency of the first radiator 1 and the second radiator 2 to the same or adjacent frequency, and realize the same frequency operation or adjacent frequency operation of the first radiator 1 and the second radiator 2. In one embodiment, the third tuning circuit 15 may not be connected at the first feeding point 14, that is, tuning devices such as capacitors and inductors are not connected, and only the second inductor is connected in parallel at the second feeding point 24. Through the frequency modulation effect of the second inductor, the resonant frequency of the second radiator 2 can also be adjusted to the same or adjacent to the resonant frequency of the first radiator 1, so that the first radiator 1 and the second radiator 2 work in the same frequency band.

[0131] In one embodiment, referring to Fig.10, the antenna device also includes a fourth tuning circuit 28, one end of the fourth tuning circuit 28 is connected to the first grounding point 21, and the other end is connected to the second floor 210. That is to say, the second radiator 2 is grounded at the first grounding point 21 through the fourth tuning circuit 28. The fourth tuning circuit 28 may also include a capacitor or an inductor, or may be composed of a capacitor and an inductor, or include a radio frequency switch, and the radio frequency switch has multiple branches, and each branch may be connected to a capacitor or an inductor. The fourth tuning circuit 28 is conducive to adjusting the efficiency pit of the second radiator 2, so that the second radiator 2 and the first radiator 1 have good isolation. In a possible implementation, the fourth tuning circuit 28 can be adjusted in coordination with the second tuning circuit 27, which is conducive to improving the adjustment accuracy of the efficiency pit and can better match the isolation between the first radiator 1 and the second radiator 2. Of course, as described above, the first grounding point 21 of the second radiator 2 can also be directly connected to the second floor 210 without connecting tuning devices such as capacitors and inductors, which will not be repeated here. In some other embodiments, the antenna device may further include a fifth tuning circuit (not shown in the figure), one end of the fifth tuning circuit is connected to the ground terminal 11, and the other end is connected to the first floor 110, so that the first radiator 1 is indirectly grounded through the fifth tuning circuit. The function of the fifth tuning circuit is similar to that of the third tuning circuit 15, and both can be used to adjust the resonant frequency of the first radiator 1 to the corresponding first working frequency band.

[0132] In one embodiment, Fig.11 This is a partial enlarged view of the electronic device provided in the fourth embodiment of the present application at the positions of the first radiator 1 and the second radiator 2, referring to Fig.11, the second radiator 2 is connected to a first tuning circuit 26 at the second feeding point 24, to a second tuning circuit 27 at the second grounding point 25, and to a fourth tuning circuit 28 at the first grounding point 21. In one embodiment, both the first tuning circuit 26 and the second tuning circuit 27 may include adjustable devices such as a radio frequency switch, and the fourth tuning circuit 28 may be a capacitor. When the electronic device is in a folded state, the radio frequency switch connected to the second open end 22A and the second grounding point 25 may be adjusted to 0 ohms. At this time, the second radiator 2 is in an abnormal working state, while the first radiator 1 is in a normal working state. In this state, the second radiator 2 may serve as a parasitic branch 3 of the first radiator 1 to enhance the radiation performance of the first radiator 1. Specifically, for the second radiator 2 in an abnormal working state, since the first tuning circuit 26 of the second radiator 2 is adjusted to 0 ohms, a current strong point is formed at the second open end 22A of the second radiator 2, and an electric field strong point is formed at the first grounding point 21. For the first radiator 1 in normal operation, the first open end 12 is an electric field strength point, and the ground end 11 is a current strength point. Therefore, in the folded state of the electronic device, the electric field strength point of the first open end 12 of the first radiator 1 is coupled with the current strength point of the second open end 22A of the second radiator 2, and the current strength point of the ground end 11 of the first radiator 1 is coupled with the electric field strength point of the first ground point 21 of the second radiator 2. Therefore, the first radiator 1 and the second radiator 2 form a magneto-electric coupling mode, that is, a magnetic parasitic mode. The second radiator 2 serves as a parasitic branch 3 of the first radiator 1, so that the first radiator 1 and the second radiator 2 together form an antenna, and the radiation performance of the first radiator 1 can be improved by the second radiator 2. In this embodiment, when the electronic device is used in a folded state, when the second radiator 2 is not used and only the first radiator 1 is used, the second radiator 2 can be switched to the parasitic branch 3 of the first radiator 1 to improve the radiation performance of the first radiator 1, so that even in the folded state of the electronic device, only the first radiator 1 can be used to exert a good radiation performance.

[0133] Fig.12 This is a return loss curve of the antenna device provided in the embodiment of the present application in the magneto-electric coupling mode, where the horizontal axis is the frequency and the vertical axis is the return loss, refer to Fig.12 , two resonance points are generated in the frequency band of 2GHz~2.4GHz, namely c1 and c2, where c1 is the resonance point brought by the first radiator 1, and c2 is the resonance point brought by the second radiator 2.

[0134] Fig.13 This is an efficiency curve diagram of the antenna device provided in the embodiment of the present application in the magnetoelectric coupling mode, where the horizontal axis is the frequency and the vertical axis is the efficiency, refer to Fig.13, curve d1 is the radiation efficiency of the antenna device in the magnetoelectric coupling mode, and curve d2 is the system efficiency of the antenna device in the magnetoelectric coupling mode. It can be seen from curve d2 that in the case corresponding to Fig.11 At the positions of the resonance points c1 and c2 shown, the system efficiency of the antenna device is above -3.6, which has a relatively high efficiency.

[0135] In one embodiment, Fig.14 A topological diagram of an electronic device provided in a fifth embodiment of the present application, Fig.15 for Fig.14 The local enlarged view at the position of the first radiator 1 and the second radiator 2, refer to Fig.15 , the first tuning circuit 26 includes a radio frequency switch, the second tuning circuit 27 is 0 ohms, the fourth tuning circuit 28 is 0 ohms, and the second radiator 2 can be switched to a passive parasitic, i.e., electric parasitic mode, by the radio frequency switch. The resonance point generated by the second radiator 2 can be located at a higher frequency position within the resonance frequency band of the first radiator 1, thereby improving the radiation performance of the first radiator 1. Fig.16 The return loss curve diagram of the antenna device in the electronic device in the fifth embodiment of the present application in the electric parasitic mode, the horizontal axis is the frequency, the vertical axis is the return loss, the curve e1 is the return loss of the first radiator 1, and the curve e2 is the return loss of the second radiator 2. Fig.16 It can be seen that the resonance point generated by the second radiator 2 can be located at a higher frequency position within the resonance frequency band (2 GHz to 2.4 GHz) of the first radiator 1 , which is beneficial to improving the radiation performance of the first radiator 1 .

[0136] Fig.17 The efficiency curve of the first radiator 1 in the electric parasitic mode and the comparison diagram of the efficiency curves in the coexistence mode in the antenna device provided in the fifth embodiment of the present application, the horizontal axis is frequency, the vertical axis is efficiency, curve f1 is the radiation efficiency of the first radiator 1 in the electric parasitic mode, curve f2 is the system efficiency of the first radiator 1 in the electric parasitic mode, curve g1 is the radiation efficiency of the first radiator 1 in the coexistence mode, and curve g2 is the system efficiency of the first radiator 1 in the coexistence mode. The coexistence mode is a mode in which the first radiator 1 and the second radiator 2 work normally and independently when the electronic device is in a folded state, the first radiator 1 can generate a first resonance, and the second radiator 2 can generate a second resonance. Refer to Fig.17 The radiation efficiency of the first radiator 1 in the electric parasitic mode is improved by 1.5 dB compared with the radiation efficiency in the coexistence mode, and the system efficiency is improved by 2 dB.

[0137] Fig.18The efficiency curve of the second radiator 2 in the electric parasitic mode in the antenna device provided in the fifth embodiment of the present application, and the efficiency curve comparison diagram in the coexistence mode, the horizontal axis is frequency, the vertical axis is efficiency, curve h1 is the radiation efficiency of the second radiator 2 in the electric parasitic mode, curve h2 is the system efficiency of the second radiator 2 in the electric parasitic mode, curve j1 is the radiation efficiency of the second radiator 2 in the coexistence mode, and curve j2 is the system efficiency of the second radiator 2 in the coexistence mode. The coexistence mode is a mode in which the first radiator 1 and the second radiator 2 work normally and independently when the electronic device is in a folded state. Fig.17 The radiation efficiency of the second radiator 2 in the electric parasitic mode is improved by 1.8 dB compared with the radiation efficiency in the coexistence mode, and the system efficiency is improved by 3 dB.

[0138] In one embodiment, Fig.19 This is a partial enlarged view of the electronic device provided in the sixth embodiment of the present application at the positions of the first radiator 1 and the second radiator 2, referring to Fig.19 , the antenna device further includes a parasitic branch 3, which is arranged on the side of the first radiator 1 having the first open end 12, and has a first gap 31 between the first open end 12, while the side of the second radiator 2 having the second open end 22A is not provided with the parasitic branch 3. Or in another embodiment, the parasitic branch 3 is arranged on the side of the second radiator 2 having the second open end 22A, and has a first gap 31 between the second open end 22A, while the side of the first radiator 1 having the first open end 12 is not provided with the parasitic branch 3. The first radiator 1 and the second radiator 2 have the same structure and are symmetrically arranged on the corresponding first body 100 and the second body 200. The parasitic branch 3 can attract current to create an asymmetric current path between the two radiators with symmetrical structures and positions, so as to achieve the generation of destructive current, improve the isolation of the two radiators in the independent working process, and expand the bandwidth. In an electronic device, the parasitic branch 3 can be a part of a metal frame of the electronic device. Corresponding breaks such as a first slit 31 can be opened at corresponding positions on the metal frame to form corresponding radiators and parasitic branches 3 respectively. There is no need to prepare and install the parasitic branch 3 separately, which is conducive to simplifying the manufacturing process and saving space in the electronic device.

[0139] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A foldable electronic device, characterized in that: The electronic device comprises an antenna device, a first body, a second body and a rotating shaft, wherein the first body and the second body are respectively arranged on both sides of the rotating shaft and are rotatably connected to the rotating shaft, the first body comprises a first floor, and the second body comprises a second floor; the antenna device comprises: A first radiator is disposed on the first body, the first radiator is provided with a ground end and a first open end, the ground end is coupled and connected to the first floor; the first radiator includes a first feeding point; a first feeding circuit, coupled to the first radiator through the first feeding point, and configured to feed a signal of a first working frequency band to the first radiator, wherein the first radiator is configured to generate a first resonance corresponding to the first working frequency band; A second radiator is arranged on the second body, the second radiator is provided with a second open end, a third open end, and a first grounding point located between the second open end and the third open end, the first grounding point is coupled and connected to the second floor; the ratio of the length of the second radiator between the second open end and the third open end to the length of the first radiator between the grounding end and the first open end is greater than 1 and less than or equal to 2; the second radiator includes a second feeding point; a second feeding circuit, coupled to the second radiator through the second feeding point, and used for feeding a signal of a second working frequency band to the second radiator, wherein the second radiator is used for generating a second resonance corresponding to the second working frequency band, and the second working frequency band is the same as or adjacent to the first working frequency band; a first tuning circuit, one end of the first tuning circuit being coupled to the second radiator, and the other end of the first tuning circuit being coupled to the second floor, for adjusting the second resonance of the second radiator to correspond to the second working frequency band; When the electronic device is in a folded state, along the thickness direction of the electronic device, the projections of the first open end and the second open end at least partially overlap, and the projection of the ground end is located between the projection of the third open end and the projection of the second open end.

2. The foldable electronic device according to claim 1, characterized in that: The second radiator comprises a second grounding point, and the second grounding point is arranged between the first grounding point and the second feeding point; The antenna device further includes a second tuning circuit, one end of the second tuning circuit is connected to the second ground point, and the other end of the second tuning circuit is connected to the second ground plane.

3. The foldable electronic device according to claim 2, characterized in that: The second tuning circuit includes a capacitor and / or an inductor and / or a radio frequency switch, and is used to adjust the efficiency pit of the second radiator.

4. The foldable electronic device according to claim 2, characterized in that: When the electronic device is in a folded state, along a thickness direction of the electronic device, a projection of the grounding end is at least partially located between a projection of the first grounding point and a projection of the second grounding point.

5. The foldable electronic device according to any one of claims 1 to 4, characterized in that: The ground terminal is electrically connected to the first floor panel.

6. The foldable electronic device according to any one of claims 1 to 4, characterized in that: The first radiator, the ground terminal and at least a portion of the first floor are integrally formed.

7. The foldable electronic device according to any one of claims 1 to 6, characterized in that: The electrical length of the first radiator between the ground end and the first open end is 1 / 4 λ, λ is a wavelength corresponding to the first working frequency band.

8. The foldable electronic device according to any one of claims 1 to 7, characterized in that: The electrical length of the second radiator between the third open end and the second open end is between 1 / 4 λ~ 1 / 2 λ, where λ is the wavelength corresponding to the second working frequency band.

9. The foldable electronic device according to any one of claims 2 to 6, characterized in that: The antenna device further includes a third tuning circuit, one end of the third tuning circuit is connected to the first radiator, and the other end of the third tuning circuit is connected to the first floor.

10. The foldable electronic device according to claim 9, characterized in that: The third tuning circuit includes a capacitor and / or an inductor and / or a radio frequency switch, and is used to adjust the first resonance to correspond to the first working frequency band.

11. The foldable electronic device according to claim 9, characterized in that: The first tuning circuit includes a first inductor, and the third tuning circuit includes a second inductor. The inductance value of the first inductor is smaller than the inductance value of the second inductor.

12. The foldable electronic device according to any one of claims 1 to 10, characterized in that: The distance between the first feeding point and the first open end is less than 7.5 mm, and the distance between the second feeding point and the second open end is less than 7.5 mm.

13. The foldable electronic device according to any one of claims 1 to 4, characterized in that: It also includes a fourth tuning circuit, one end of the fourth tuning circuit is connected to the first ground point, and the other end is connected to the second ground point.

14. The foldable electronic device according to claim 13, characterized in that: The fourth tuning circuit includes a capacitor and / or an inductor and / or a radio frequency switch, and is used to adjust the efficiency pit of the second radiator.

15. The foldable electronic device according to any one of claims 1 to 14, characterized in that: It also includes a parasitic branch, which is arranged on a side of the first radiator having the first open end and has a first gap between the first open end; or, the parasitic branch is arranged on a side of the second radiator having the second open end and has a first gap between the second open end.

16. The foldable electronic device according to any one of claims 1 to 15, characterized in that: The frequency of the resonance point of the first resonance is higher than the frequency of the resonance point of the second resonance.

17. The foldable electronic device according to any one of claims 1 to 16, characterized in that: A difference between a resonance point frequency of the first resonance and a resonance point frequency of the second resonance is less than or equal to 200 MHz.

18. The foldable electronic device according to any one of claims 1 to 17, characterized in that: The communication frequency band corresponding to the first working frequency band signal and the second working frequency band signal is between 2.3 GHz and 2.7 GHz.

19. The foldable electronic device according to any one of claims 1 to 18, characterized in that: The resonance point of the first resonance is within the range of 2.5 GHz to 2.7 GHz, and the resonance point of the second resonance is within the range of 2.4 GHz to 2.5 GHz; or, The resonance point of the first resonance is within the range of 2.4 GHz to 2.5 GHz, and the resonance point of the second resonance is within the range of 2.3 GHz to 2.4 GHz; or, The resonance point of the first resonance is within the range of 1710 MHz to 2170 MHz, and the resonance point of the second resonance is within the range of 1575 MHz to 1630 MHz.

20. The foldable electronic device according to any one of claims 1 to 19, characterized in that: The first feeding circuit and the second feeding circuit operate simultaneously, so that the first radiator generates the first resonance, and at the same time, the second radiator generates the second resonance.

Images