Foldable electronic device

Abstract

Provided in the present application is a foldable electronic device. An antenna apparatus comprises a first radiator, a second radiator, a first feed circuit, a second feed circuit and a first tuning circuit, wherein the length, between a third open end and a second open end, of the second radiator is greater than the length, between a grounding end and a first open end, of the first radiator, when the electronic device is in a folded state, the projection of the first open end at least partially overlaps that of the second open end, and the projection of the grounding end is located between a first grounding point and the second open end; and the first tuning circuit is used for adjusting a second operating frequency band to be the same as or adjacent to a first operating frequency band. In the present application, electric field hotspots of two radiators are coupled to each other to form a first current path, current hotspots of the two radiators are coupled to each other to form a second current path, and the directions of the two current paths are opposite each other, such that a better degree of isolation can be obtained no matter whether the two radiators independently operate in the same frequency band or in adjacent frequency bands.

Description

Foldable electronic devices

[0001] This invention claims priority to the Chinese patent application filed with the State Intellectual Property Office on December 25, 2023, with application number 202311811542.2 and application name “Foldable Electronic Device”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of communication technology, and in particular to a foldable electronic device. Background Art

[0003] Some foldable electronic products, such as foldable phones, have antennas on either side of the hinge. When the phone is folded, the antennas on either side of the hinge come close together, resulting in poor isolation and performance when the two antennas operate independently.

[0004] Summary of the Invention

[0005] 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.

[0006] 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 ground end and a first open end, and the ground 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. A second radiator is disposed on the second body and has a second open end, a third open end, and a first grounding point located between the second and third open ends. The first grounding point is coupled to the second floor. The ratio of the length of the second radiator between the third and second open ends 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 is coupled to the second radiator via the second feeding point and is configured to feed a signal in a second operating frequency band to the second radiator. The second radiator is configured to generate a second resonance corresponding to the second operating frequency band, which is the same as or adjacent to the first operating 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 for adjusting the second resonance of the second radiator to correspond to the second operating frequency band. When the electronic device is folded, along the thickness direction of the electronic device, the projections of the first and second open ends at least partially overlap, and the projection of the grounding end is located between the projections of the third and second open ends.

[0007] In the present application, by connecting a first tuning circuit to 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. Furthermore, 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 intensity points can be formed at both the first open end and the second open end. 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 intensity points at the first open end and the second open end can be coupled to each other, generating a first current path. At the same time, the ground end of the first radiator and the first grounding point of the second radiator are respectively current intensity points. The current intensity points of the two radiators can be coupled to form a second current path. 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, 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 independently when the electronic device is in the folded state.

[0008] In one possible implementation, the second radiator includes a second ground point, disposed between the first ground point and the second feed point. The antenna device also includes a second tuning circuit, one end of which is connected to the second ground point and the other end is connected to the second ground plane. This second tuning circuit can adjust the efficiency pit of the second radiator, shallowing it or moving it out of band, thereby achieving high isolation between the two radiators and achieving good antenna performance for both radiators.

[0009] In one 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 having multiple branches, each of which may be connected to a capacitor or an inductor. This makes the design of the second tuning circuit more flexible and adaptable to various application scenarios.

[0010] In one possible implementation, when the electronic device is in a folded state, the projection of the ground terminal is at least partially located between the projection of the first ground point and the projection of the second ground point along the thickness direction of the electronic device. The ground terminal, the first ground point, and the second ground point are staggered so that the return paths of the ground terminal and the first ground point are different, which facilitates improving the isolation between the first radiator and the second radiator during operation. Furthermore, the different return paths of the ground terminal and the second ground point facilitate adjusting the efficiency pit via a second tuning circuit connected to the second ground point, so that the current paths of the first radiator and the second radiator meet a phase cancellation condition, thereby achieving better isolation when the first radiator and the second radiator are each operating independently in the folded state of the electronic device.

[0011] In a possible implementation, the ground terminal is electrically connected to the first floor panel. This electrical connection means that the ground terminal and the first floor panel are directly electrically connected, or the ground terminal and the first floor panel are electrically connected via a physical element, thereby ensuring the quality of energy transmission.

[0012] In one possible implementation, the first radiator, the ground terminal, and at least a portion of the first floor are integrally formed. This ensures the reliability of the structural connection between the first radiator, the ground terminal, and the first floor, while also simplifying the processing and improving processing accuracy. In one embodiment, the middle frame of an electronic device such as a mobile phone is an integrally formed structure, and portions 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 portion of the middle frame of an electronic device such as a mobile phone.

[0013] In one possible implementation, the electrical length of the first radiator between the ground end and the first open end is ¼λ, where λ is a wavelength within the first operating frequency band. A first radiator having this electrical length achieves both good signal transmission and reception quality and a small structural size, facilitating a miniaturized design of the antenna device.

[0014] In one possible implementation, the electrical length of the second radiator between the first ground point and the second open end is between 1 / 4λ and 1 / 2λ, where λ is a wavelength within the second operating frequency band. The second radiator has a greater electrical length than the first radiator, which helps improve isolation between the first and second radiators when they operate independently, ensures better signal transmission and reception quality for the second radiator, and facilitates structural miniaturization.

[0015] In one possible implementation, the antenna device further includes a third tuning circuit, one end of the third tuning circuit being connected to the first radiator and the other end being 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.

[0016] In one 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 operating 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 combination of a capacitor and an inductor, or include a radio frequency switch, and the radio frequency switch has multiple branches, each of which can be connected to a capacitor or an inductor, so that the design of the third tuning circuit can be more flexible and 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 operating 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 can obtain good antenna performance.

[0017] In one possible implementation, the second 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, 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.

[0018] In one 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 brought closer to the first open end, and the second feeding point can be brought 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 with the ground ends of the two radiators, thereby improving the isolation of the two radiators when they are working independently.

[0019] In one possible implementation, the electrical length between the first feeding point and the first open end is less than 1 / 8λ, where λ is a wavelength within the first operating frequency band, and the electrical length between the second feeding point and the second open end is less than 1 / 8λ, where λ is a wavelength within the second operating frequency band. Thus, the first feeding point can be positioned closer to the first open end, and the second feeding point closer to the second open end, which will not be further described here.

[0020] In one 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 flattened, there is a large distance between the first radiator and the second radiator, thereby achieving good isolation between the first and second radiators when they operate independently. When the electronic device is folded, the first and second radiators are closer together, and the path formed by the electric field strength point coupling of the two radiators and the current path formed by the current strength point coupling cancel each other out, thereby achieving good isolation between the two radiators when they operate independently.

[0021] In one 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. 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, a large distance can be provided between the first radiator and the second radiator, thereby achieving good isolation when the first radiator and the second radiator operate independently. When the electronic device is in a folded state, the first radiator and the second radiator are relatively close, and a path formed by point-coupling of the electric field strength of the two radiators and another current path formed by point-coupling of the current strength cancel each other out, thereby achieving good isolation between the two radiators when they operate independently.

[0022] In one possible implementation, the antenna device further includes a fourth tuning circuit, one end of which is connected to the first ground point and the other end of which is connected to the second ground plane. The fourth tuning circuit facilitates adjusting the efficiency pit of the second radiator, thereby achieving good isolation between the second radiator and the first radiator.

[0023] In one possible implementation, the fourth tuning circuit includes a capacitor and / or an inductor and / or an RF switch, configured to adjust the efficiency pit of the second radiator. In one possible implementation, the fourth tuning circuit can be coordinated with the second tuning circuit to improve the efficiency pit adjustment accuracy and better match the isolation between the first and second radiators.

[0024] In one possible implementation, the antenna device further includes a parasitic branch, which is disposed on the same side of the first body as the first radiator on the side having the first open end, and has a first gap between the first open end and the first body; or, the parasitic branch is disposed on the side of the second radiator on the side having the second open end, and has a first gap between the second open end and the second body. The first radiator and the second radiator have the same structure and are symmetrically disposed on the corresponding first and second bodies. The parasitic branch can attract current to create an asymmetric current path between the two radiators, which are symmetrical in structure and position, thereby generating destructive currents, improving the isolation between the two radiators during independent operation, and expanding the bandwidth.

[0025] In a possible implementation, the frequency of the resonance point of the first resonance is higher than the frequency of the resonance point of the second resonance.

[0026] In one 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 200 MHz. If the first radiator and the second radiator adopt the same structure and are symmetrically arranged in the electronic device, then when the electronic device is folded, when the difference between the resonant frequencies of the two radiators is within 200 MHz, the isolation between the two radiators is poor and good radiation performance cannot be achieved. 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, so that the difference in resonant frequency can be within 200 MHz. 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 can be canceled, thereby improving the isolation of the two radiators when they work independently with a resonant frequency difference of within 200 MHz, thereby improving the radiation performance of the two radiators.

[0027] In one possible implementation, the difference between the resonant point frequency of the first resonance and the resonant point frequency of the second resonance is less than or equal to 200 MHz. In other words, when the first radiator and the second radiator operate at the same frequency or adjacent frequencies, good isolation can be achieved, and both radiators can exhibit good radiation performance.

[0028] In a possible implementation, 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.

[0029] 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.

[0030] In one possible implementation, when the first radiator and the second radiator are operating simultaneously, the first radiator generates the first resonance, and the second radiator generates the second resonance. In other words, the first radiator and the second radiator can coexist and operate, i.e., the first radiator can generate the first resonance when operating, and the second radiator can generate the second resonance when operating simultaneously. In this coexistence state, the first radiator and the second radiator have good isolation and good radiation performance.

[0031] It should be understood that the foregoing general description and the following detailed description are merely illustrative and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. 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 any creative work.

[0033] FIG1 is a schematic structural diagram of an electronic device provided in an embodiment of the present application;

[0034] FIG2 is a partial schematic diagram of an electronic device provided by an embodiment of the present application;

[0035] FIG3 is a topological diagram of an electronic device provided in a first embodiment of the present application;

[0036] FIG4 is a partial enlarged view of the first radiator and the second radiator in FIG3 ;

[0037] FIG5 is a graph showing return loss and isolation of an antenna device according to a first embodiment of the present application;

[0038] FIG6 is a partial schematic diagram of an electronic device provided in another embodiment of the present application;

[0039] FIG7 is a topological diagram of an electronic device provided in a second embodiment of the present application;

[0040] FIG8 is a partial enlarged view of the first radiator and the second radiator in FIG7;

[0041] FIG9 is a topological diagram of an electronic device provided in a third embodiment of the present application;

[0042] FIG10 is a partial enlarged view of the first radiator and the second radiator in FIG9;

[0043] FIG11 is a partial enlarged view of the electronic device provided by the fourth embodiment of the present application at the positions of the first radiator and the second radiator;

[0044] FIG12 is a return loss curve diagram of the antenna device provided in an embodiment of the present application in a magnetoelectric coupling mode;

[0045] FIG13 is an efficiency curve diagram of the antenna device provided in the embodiment of the present application in the magnetoelectric coupling mode;

[0046] FIG14 is a topological diagram of an electronic device provided in a fifth embodiment of the present application;

[0047] FIG15 is a partial enlarged view of the first radiator and the second radiator in FIG14;

[0048] FIG16 is a graph showing a return loss curve of an antenna device in an electronic device in an electric parasitic mode according to a fifth embodiment of the present application;

[0049] FIG17 is 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;

[0050] FIG18 is 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;

[0051] FIG19 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.

[0052] Reference numerals:

[0053] 100-First ontology;

[0054] 110-first floor;

[0055] 200-Second Body;

[0056] 210-second floor;

[0057] 300-display screen;

[0058] 400-rotating shaft;

[0059] 1- first radiator;

[0060] 11- ground terminal;

[0061] 12-first open end;

[0062] 13- first feeding circuit;

[0063] 14-first feeding point;

[0064] 15- third tuning circuit;

[0065] 2- second radiator;

[0066] 21-first grounding point;

[0067] 22A-second open end;

[0068] 22B-third open end;

[0069] 23- second feeding circuit;

[0070] 24- second feeding point;

[0071] 25-grounding point;

[0072] 26-first tuning circuit;

[0073] 27- second tuning circuit;

[0074] 28-Fourth tuning circuit.

[0075] 3-parasitic branches;

[0076] 31-The first gap. DETAILED DESCRIPTION

[0077] 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.

[0078] It should be clear that the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0079] The terms used in the embodiments of the present application are for the purpose of describing specific embodiments only and are not intended to limit the present application. The singular forms "a", "an", "the" 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 otherwise.

[0080] It should be understood that the term "and / or" as used herein simply describes a relationship between associated objects, indicating that three possible relationships exist. For example, "A and / or B" can represent: A alone, A and B together, or B alone. Furthermore, the character " / " in this document generally indicates an "or" relationship between the associated objects.

[0081] In the description of this application, unless otherwise specified or limited, the terms "first" and "second" are used for descriptive purposes only and are not to 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 mean a fixed connection, a detachable connection, an integral connection, or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0082] Radiator, or antenna branch: is a device in the antenna used to receive / send electromagnetic wave radiation. In some cases, "antenna" is understood in a narrow sense as a radiator, which converts the guided wave energy from the transmitter into radio waves, or converts radio waves into guided wave energy, which is used to radiate and receive radio waves. The modulated high-frequency current energy (or guided wave energy) generated by the transmitter is transmitted to the transmitting radiator via the feeder line, and is converted by the radiator into a certain polarized electromagnetic wave energy and radiated in the desired direction. The receiving radiator converts the electromagnetic wave energy of a certain polarization from a specific direction in space into modulated high-frequency current energy and transmits it to the receiver input via the feeder line.

[0083] The radiator (or antenna branch) may include a conductor with a specific shape and size, such as a linear or sheet-like shape, etc. The present application does not limit the specific shape. In one embodiment, the linear radiator can be simply referred to as a linear antenna. In one embodiment, the linear radiator can be implemented by a conductive frame, and can also be called a frame antenna. In one embodiment, the linear radiator can be implemented by a bracket conductor, and can also be called a bracket antenna. In one embodiment, the linear radiator, or the radiator of the linear antenna, has a wire diameter (for example, including thickness and width) much smaller than the wavelength (for example, the wavelength of the medium) (for example, less than 1 / 16 of the wavelength), and the length can be comparable to the wavelength (for example, the wavelength of the medium) (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). 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 typically includes two radiating branches, and each branch is fed by a feeding portion 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 a 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 circular, rectangular, annular, etc., and the present application does not limit the specific shape. The structure of a microstrip antenna generally consists of a dielectric substrate, a radiator, and a floor, wherein the dielectric substrate is arranged between the radiator and the floor.

[0084] The radiator (or antenna branch) may also include a slot or slot formed in a conductor, for example, a closed or semi-closed slot or slot formed in a grounded conductor surface. In one embodiment, a slotted or slotted radiator may be referred to as a slot antenna or slot antenna. In one embodiment, the radial dimension (e.g., including the width) of the slot or slot of the slot antenna / slot antenna is much smaller than the wavelength (e.g., the dielectric wavelength) (e.g., less than 1 / 16 of the wavelength), and the length dimension is comparable to the wavelength (e.g., the dielectric wavelength) (e.g., approximately 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 slot may be referred to as a closed slot antenna. In one embodiment, a radiator with a semi-closed slot or slot (e.g., a closed slot or slot with an additional opening) may be referred to as an open slot antenna. In some embodiments, the slot is elongated. In some embodiments, the slot is approximately half a wavelength (e.g., the dielectric wavelength). In some embodiments, the slot is approximately an integer multiple of the wavelength (e.g., one wavelength). In some embodiments, the slot can be fed with a transmission line spanning one or both sides, thereby exciting a radio frequency electromagnetic field in the slot and radiating electromagnetic waves into space. In one embodiment, the radiator of a slot antenna or slot antenna can be implemented as a conductive frame with both ends grounded, also known as a frame antenna. In this embodiment, the slot antenna or slot antenna can be considered to include a linear radiator spaced from the floor and grounded at both ends, thereby forming a closed or semi-enclosed slot or slot. In one embodiment, the radiator of a slot antenna or slot antenna can be implemented as a bracket conductor with both ends grounded, also known as a bracket antenna.

[0085] Coupling: can be understood as direct coupling and / or indirect coupling, and "coupling 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 form in which different components in the circuit structure are connected 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 forming an equivalent capacitance through coupling between the gap between two conductive parts.

[0086] 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 resonance point 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 in other words, 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 generate a corresponding fundamental mode resonance.

[0087] 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.

[0088] Communication frequency band / working frequency band: Regardless of the type of antenna, it always operates within a certain frequency range (band width). For example, an antenna that supports the B40 frequency band has an operating frequency band that includes frequencies in the range of 2300MHz to 2400MHz, or in other words, the antenna's operating frequency band includes the B40 frequency band. The frequency range that meets the index requirements can be regarded as the antenna's operating frequency band. The width of the operating frequency band is called the operating bandwidth. The operating bandwidth of an omnidirectional antenna may reach 3-5% of the center frequency. The operating 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.

[0089] 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 overlap one or more operating frequency bands of the antenna.

[0090] Wavelength: Or operating wavelength, this 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, if the center frequency of the B1 uplink frequency band (resonant frequency 1920MHz to 1980MHz) is 1955MHz, the operating wavelength can be the wavelength calculated using 1955MHz. "Operating wavelength" is not limited to the center frequency; it can also refer to the wavelength corresponding to a non-center frequency of the resonant frequency or operating frequency band.

[0091] It should be understood that the wavelength of the radiation signal in 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: Wherein, 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" can 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.

[0092] End / point: The "end / point" in the first end / second end / feeding end / grounding end / feeding point / grounding point / connection point of an antenna radiator should not be narrowly understood as an end point or end portion that is physically disconnected from other radiators. It can also be considered as a point or a section on a continuous radiator. In one embodiment, an "end / point" may include a connection / coupling area on an antenna radiator that is coupled to other conductive structures. For example, the feeding end / feeding point may be a coupling area on an antenna radiator that is coupled to a feeding structure (for example, an area facing a portion of the feeding structure). For another example, the grounding end / grounding point may be a connection / coupling area on an antenna radiator that is coupled to a grounding structure.

[0093] 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 floating 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 through the open end to transfer coupling energy (which can be understood as transferring current).

[0094] 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 the 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.

[0095] In some embodiments, the electronic device may also include a test socket (or RF socket or RF test socket). This test socket can be used to insert a coaxial cable and test the characteristics of the RF front-end circuit or antenna radiator through the cable. The RF front-end circuit can be considered as the circuit portion coupled between the test socket and the transceiver.

[0096] 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.

[0097] 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 radio frequency channel in a transceiver (for example, a port (pin) of a radio frequency chip); they can also share a radio frequency front-end circuit, for example, processing signals through a switch or amplifier in a radio frequency front-end.

[0098] It should also be understood that two feeding circuits in the first / second / ...Nth feeding circuit in the present application usually correspond to two radio frequency test sockets in the electronic device.

[0099] The tuning circuit is a circuit associated with 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 feed circuit and the radiator. In one embodiment, the tuning circuit performs impedance matching and / or frequency tuning functions. It is generally considered to be part of the antenna.

[0100] In one embodiment, the tuning circuit may include a switch and / or an electronic component / device, wherein 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.

[0101] Ground / Floor: This generally refers to at least a portion of any grounding layer, grounding plate, or grounding metal layer within an electronic device (such as a mobile phone), or at least a portion of any combination of any of the above grounding layers, grounding plates, or grounding components. "Ground / Floor" can be used to ground components within the electronic device. In one embodiment, "ground / floor" can include any one or more of the following: the grounding layer of the electronic device's circuit board, the grounding plate formed by the electronic device's midframe, the grounding metal layer formed by the metal film below the screen, the conductive grounding layer of the battery, and conductive 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-to-14-layer board having 8, 10, 12, 13, or 14 layers of conductive material, or an element separated and electrically insulated by a dielectric layer or insulating layer such as fiberglass, polymer, or the like. In one embodiment, the circuit board includes a dielectric substrate, a grounding layer, and a trace layer, with the trace layer and the grounding layer being electrically connected via vias. In one embodiment, components such as a display, touch screen, input buttons, transmitter, processor, memory, battery, charging circuit, and system-on-chip (SoC) structures can be mounted on or connected to a circuit board, or electrically connected to a trace layer and / or ground layer in the circuit board. For example, a radio frequency source can be located on a trace layer.

[0102] Any of the above-mentioned grounding layers, grounding plates, or grounding metal layers are made of a conductive material. In one embodiment, the conductive material can be any of the following: copper, aluminum, stainless steel, brass, and alloys thereof, 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, a graphite-coated substrate, a copper-plated substrate, a brass-plated substrate, and an aluminum-plated substrate. Those skilled in the art will appreciate that the grounding layer / grounding plate / grounding metal layer can also be made of other conductive materials.

[0103] Grounding refers to coupling with the ground / floor via a grounding structure and / or grounding circuit. In one embodiment, grounding can be achieved through physical grounding, such as achieving physical grounding at a specific location on the frame through a portion of the middle frame's structural components (or referred to as a physical ground). In one embodiment, grounding can be achieved through device grounding, such as grounding through a capacitor, inductor, resistor, or other device connected in series or parallel (or referred to as a device ground).

[0104] In foldable device designs, some models feature antennas on either side of the hinge. When the phone is folded, the antennas on either side of the hinge are close together, resulting in poor isolation and performance when the two antennas operate independently. To minimize the impact of isolation, these two antennas must operate at low and medium-high frequencies, respectively. They cannot operate at the same frequency or with a small frequency difference.

[0105] Antenna system efficiency refers to the ratio of the power radiated by the antenna into space (i.e., the power effectively converted into electromagnetic waves) to the antenna's input power. System efficiency is the actual efficiency after considering antenna port matching. In other words, the antenna system efficiency is the actual efficiency (i.e., efficiency) of the antenna.

[0106] Antenna radiation efficiency: This refers to the ratio of the power radiated into space by an antenna (i.e., the power effectively converted into electromagnetic waves) to the active power input to the antenna. Active power input to the antenna = antenna input power - power loss; power loss primarily includes return loss and metal ohmic loss and / or dielectric loss. Radiation efficiency measures the antenna's radiation capability, and both metal loss and dielectric loss contribute to it.

[0107] Those skilled in the art will understand that efficiency is generally expressed as a percentage, which has a corresponding conversion relationship with dB. The closer the efficiency is to 0 dB, the better the efficiency of the antenna.

[0108] Antenna return loss: This can be understood as the ratio of the signal power reflected back to the antenna port by the antenna circuit to the antenna port's transmitted power. The smaller the reflected signal, the larger the signal radiated from the antenna into space, and the greater the antenna's radiation efficiency. The larger the reflected signal, the smaller the signal radiated from the antenna into space, and the lower the antenna's radiation efficiency.

[0109] Antenna return loss can be expressed using the S11 parameter, a type of S parameter. S11 represents the reflection coefficient and can characterize the antenna's transmission efficiency.

[0110] 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 portion of the resonance shown in the S11 diagram that is 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, the smaller the antenna return loss and the less energy reflected back by the antenna itself, which means that more energy actually enters the antenna and the higher the antenna system efficiency. The larger the S11 parameter, the greater the antenna return loss and the lower the antenna system efficiency.

[0111] It should be noted that in engineering, an S11 value of -6dB is generally used as a standard. When the S11 value of an antenna is less than -6dB, it can be considered that the antenna can work normally, or the antenna can be considered to have good transmission efficiency.

[0112] Antenna isolation refers to the ratio of the signal received by one antenna to the signal from the transmitting antenna. Isolation is a physical quantity used to measure the degree of antenna mutual coupling. Assuming two antennas form a two-port network, the isolation between the two antennas is the S21 and S12 values ​​between the antennas. Antenna isolation can be expressed using the S21 and S12 parameters. These parameters are typically negative numbers. Smaller S21 and S12 values ​​indicate greater isolation and less mutual coupling between the antennas. Larger S21 and S12 values ​​indicate less isolation and greater mutual coupling between the antennas. Antenna isolation depends on factors such as the antenna radiation pattern, the spatial distance between the antennas, and antenna gain.

[0113] The technical solutions provided in the embodiments of the present application are applicable to electronic devices that adopt 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 embodiments of the present application may be a foldable electronic device, such as a foldable mobile phone, a foldable tablet computer, a foldable smart home, etc. The embodiments of the present application are not limited to this. Figure 1 exemplarily shows the electronic device provided in the embodiments of the present application, and the electronic device is illustrated as a foldable mobile phone.

[0114] Referring to Figure 1, an electronic device includes a first body 100, a second body 200, and a hinge 400. The first body 100 and the second body 200 are respectively arranged on either side of the hinge 400 and are rotatably connected to the hinge 400. Figure 2 is 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 panel 110, and the second body 200 includes a second floor panel 210. The first floor panel 110 and the second floor panel 210 may be printed circuit boards, which can be used to mount and support various components and provide electrical connections. The first body 100, the second body 200, and the hinge 400 can constitute a foldable electronic device such as a foldable mobile phone or a foldable tablet computer. These devices include a display screen 300, which can be covered on the first body 100, the second body 200, and the hinge 400 for displaying information. In one embodiment, the first body 100 and the second body 200 can each include a metal middle frame, a metal frame, etc. of the electronic device, or can serve as the outer shell of the electronic device. In one embodiment, the electronic device provided in this embodiment further includes an antenna device. The first radiator 1 in the antenna device can be disposed on the first body 100, and the second radiator 2 in the antenna device can be disposed on the second body 200. When the electronic device is in an unfolded state or a folded state, the two radiators can operate as two independent antennas. Of course, when the electronic device is in the folded state, one of the two radiators can serve as a parasitic branch 3 of the other, so that the two radiators constitute a single antenna and operate.

[0115] In one embodiment, FIG3 is a topological diagram of an electronic device provided in one embodiment of the present application. Referring to FIG3 , the antenna device includes a first radiator 1, a first feed circuit 13, a second radiator 2, and a second feed circuit 23. The first radiator 1 can be disposed on the first body 100 and can move synchronously with the first body 100. FIG4 is a partial enlarged view of the first radiator 1 and the second radiator 2 in FIG3 . Referring to FIG4 , the first radiator 1 is provided with a ground terminal 11 and a first open end 12. The ground terminal 11 is coupled to a first floor plate 110 for grounding. In one embodiment, the ground terminal 11 can be directly connected to the first floor plate 110. In another embodiment, the ground terminal 11 can also be indirectly connected to the first floor plate 110 via a device such as a capacitor, inductor, or radio frequency switch. In one embodiment, the ground terminal 11, the first radiator 1, and at least a portion of the first floor plate 110 can be integrally formed, thereby achieving physical 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 parts of the middle frame can be reused as the first radiator 1, ground terminal 11, and first floor 110 in this application. In one embodiment, the first floor 110 can be the middle plate portion of the middle frame of an electronic device such as a mobile phone.

[0116] The first open end 12 does not contact the first floor 110. The first radiator 1 includes a first feeding point 14. The first feeding circuit 13 is coupled to the first radiator 1 via the first feeding point 14 and is configured to feed a signal of a first operating frequency band to the first radiator 1. The first radiator 1 is configured to generate a first resonance corresponding to the first operating frequency band.

[0117] The second radiator 2 can be disposed on the second body 200 and can move synchronously with the second body 200. Referring to 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 indirectly connected to the second floor 210 via a device. Neither the second open end 22A nor the third open end 22B contacts the second floor 210. The second radiator 2 includes a second feeding point 24. A second feeding circuit 23 is coupled to the second radiator 2 via the second feeding point 24 for feeding a signal in a second operating frequency band to the second radiator 2. The second radiator 2 is configured to generate a second resonance corresponding to the second operating frequency band, which is the same as or adjacent to the first operating frequency band. In one embodiment, the resonant frequency of the first resonance is higher than the resonant frequency of the second resonance.

[0118] In one embodiment, as described above, the first body 100 and the second body 200 may each 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 portion of the frame of the electronic device may serve as the first radiator 1 and the second radiator 2, thereby reducing the space occupied by the radiator in the electronic device and facilitating the miniaturization of the electronic device. In another embodiment, the first body 100 and the second body 200 each include a housing, which may be a plastic housing or a metal housing, or a housing formed by providing a metal layer within a plastic housing, and the first radiator 1 and the second radiator 2 may both be provided within the housing. When the internal space of the electronic device is sufficiently large, the antenna device may be installed as a whole within the housing, thereby facilitating disassembly and maintenance of the antenna device.

[0119] When the electronic device is in the unfolded state, the first radiator 1 and the second radiator 2 are far apart, which can achieve good isolation and each can operate 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 length of the two radiators is 1 / 4λ, where λ is the wavelength, when the two antennas operate at the same frequency or adjacent frequencies, the isolation between the two antennas is poor, the radiation performance of the radiators is poor, and it is impossible to achieve normal independent operation of the two antennas in the folded state of the electronic device. In this case, in order to maximize the isolation of the two radiators and meet the radiation performance of the two radiators when they work independently, the two radiators are usually operated in different frequency bands with a large frequency difference, for example, one radiator operates in a low frequency band and the other operates in a medium or high frequency band. This imposes a large restriction on the operating frequency band of the antenna.

[0120] To this end, in one embodiment, referring to FIG4 , the antenna device further 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, by sharing a spring clip (usually referred to as a feeding spring clip) to achieve electrical connection with the second radiator 2. The other end of the first tuning circuit 26 is coupled to the second ground plane 210, and is used to adjust the second resonance generated by the second radiator 2 to a second operating frequency band that is the same as or adjacent to the first operating 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. The phrase "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. When the first feeding circuit 13 feeds the first radiator 1 via the first feeding point 14, and the second feeding circuit 23 feeds the second radiator 2 via the second feeding point 24, electric field strength points can be formed at both the first open end 12 and the second open end 22A. 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 at the first open end 12 and the second open end 22A can be coupled to each other, generating a first current path. Simultaneously, the ground end 11 of the first radiator 1 and the first ground point 21 of the second radiator 2 are both current strength points. The current strength points of the two radiators can be coupled to form a second current path, with the directions of the first and second current paths being opposite to each other. Therefore, when the first and second current paths meet the phase cancellation condition, good isolation can be achieved between the two radiators when operating in the same or adjacent frequency bands, enabling both radiators to operate independently and normally when the electronic device is folded. The first tuning circuit 26 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 having multiple branches, each of which 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.

[0121] Figure 5 shows return loss and isolation curves for the antenna device according to the first embodiment of the present application. Referring to Figure 5 , curve a1 is the return loss curve for the first radiator 1, curve a2 is the isolation curve for the first radiator 1, curve b1 is the return loss curve for the second radiator 2, and curve b2 is the isolation curve for the second radiator 2. Curves a1 and b1 indicate that the first radiator 1 and the second radiator 2 operate in the same resonant frequency band (near 2.04 GHz). Curves a2 and b2 indicate that curves a2 and b2 nearly overlap, and their isolation is below -15 dB, demonstrating good isolation. Therefore, the antenna device according to the present embodiment can achieve good isolation when the first radiator 1 and the second radiator 2 operate independently in the folded state of the electronic device. In one embodiment, referring to Figure 2 , the first radiator 1 is disposed on a side of the first body 100 away from the rotation axis 400, and the second radiator 2 is disposed on a side of the second body 200 away from the rotation axis 400. When the electronic device is flattened, there is a large distance between first radiator 1 and second radiator 2, thereby achieving good isolation when the first radiator 1 and second radiator 2 operate independently. When the electronic device is folded, the first radiator 1 and second radiator 2 are closer together, and the path formed by the electric field strength point coupling of the two radiators and the current path formed by the current strength point coupling cancel each other out, thus achieving good isolation between the two radiators when they operate independently.

[0122] In another embodiment, FIG6 is a partial schematic diagram of an electronic device provided in another embodiment of the present application. Referring to FIG6 , a first radiator 1 is disposed on a side of the first body 100 adjacent to the rotation axis 400, and a second radiator 2 is disposed on a side of the second body 200 adjacent to the rotation axis 400. 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, a large distance can be provided between the first radiator 1 and the second radiator 2, thereby achieving good isolation when the first radiator 1 and the second radiator 2 operate 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, thereby achieving good isolation between the two radiators when they operate independently.

[0123] In one embodiment, referring to FIG4 , the distance between the first feed point 14 and the first open end 12 can be less than 7.5 mm, and the distance between the second feed point 24 and the second open end 22A can also be less than 7.5 mm. Thus, the first feed point 14 can be brought closer to the first open end 12, and the second feed point 24 can be brought 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, which can be offset by another current path formed by coupling the ground ends of the two radiators, thereby improving the isolation between the two radiators when they are working independently. In one possible implementation, the electrical length between the first feed point 14 and the first open end 12 is less than 1 / 8λ, where λ is a wavelength within the first operating frequency band. The electrical length between the second feed point 24 and the second open end 22A is less than 1 / 8λ, where λ is a wavelength within the second operating frequency band. Thus, the first feed point 14 can be positioned closer to the first open end 12, and the second feed point 24 can be positioned closer to the second open end 22A. This will not be further described here.

[0124] 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 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 resonant point frequency of the first resonance and the resonant point frequency of the second resonance is less than or equal to 200 MHz. In one embodiment, the resonance point of the 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).

[0125] In one embodiment, because 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 frequency adjustment device is used, the resonant frequency of the relatively longer second radiator 2 is lower than the resonant frequency of the relatively shorter first radiator 1. Figure 7 is a topological diagram of the electronic device provided in the second embodiment of the present application, and Figure 8 is a partial enlarged view of the first radiator 1 and the second radiator 2 in Figure 7. Referring to Figure 8, to achieve co-frequency operation of the first radiator 1 and the second radiator 2, the second radiator 2 includes a second grounding point 25, which is located between the first grounding point 21 and the second feeding point 24. This second grounding point 25 is a location on the second radiator 2 for grounding. The antenna device also includes a second tuning circuit 27, one end of which is connected to the second grounding point 25 and the other end is connected to the second ground plane 210 for grounding. The second tuning circuit 27 may include a capacitor or an inductor, or a combination of a capacitor and an inductor, or include an RF switch having multiple branches, each of which may be connected to a capacitor or an inductor. The second tuning circuit 27 may adjust the efficiency pit of the second radiator 2, shallowing it or moving it out of band, thereby achieving high isolation between the two radiators and enabling both radiators to achieve better antenna performance.

[0126] 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, without overlapping with the projection of the first ground point 21 and the projection of the second ground point 25. In another embodiment, at least a portion 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. The ground terminal 11, the first ground point 21, and the second ground point 25 are staggered, so that the return paths of the ground terminal 11 and the first ground point 21 are different, which helps to improve the isolation between the first radiator 1 and the second radiator 2 during operation. 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.

[0127] In one embodiment, the electrical length of the first radiator 1 between the ground end 11 and the first open end 12 is ¼λ, where λ is a wavelength corresponding to the first operating frequency band. Having this electrical length allows the first radiator 1 to achieve both good signal transmission and reception quality and a small structural size, facilitating a miniaturized design of the antenna device.

[0128] 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 / 4λ and 1 / 2λ, where λ is a wavelength corresponding to the second operating frequency band. The second radiator 2 has a greater electrical length than the first radiator 1, which helps improve the isolation between the first radiator 1 and the second radiator 2 when they operate independently, while ensuring better signal transmission and reception quality for the second radiator 2 and facilitating structural miniaturization.

[0129] In one embodiment, FIG9 is a topological diagram of an electronic device provided in accordance with the third embodiment of the present application. FIG10 is a partially enlarged view of FIG9 at the locations of the first radiator 1 and the second radiator 2. Referring to FIG10 , 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 a location on the first radiator 1 near the first feed point 14. In one embodiment, one end of the third tuning circuit 15 can be coupled to the first feed point 14. The other end of the third tuning circuit 15 is connected to the first ground plane 110, meaning that the first radiator 1 is grounded at the first feed point 14 via the third tuning circuit 15. The third tuning circuit 15 can have a similar structure to the aforementioned first tuning circuit 26, meaning that the third tuning circuit 15 can also include a capacitor or an inductor, or a combination of a capacitor and an inductor, or an RF switch having multiple branches, each of which can be connected to a capacitor or an inductor. The third tuning circuit 15 can adjust the resonant frequency of the first radiator 1 to the corresponding first operating frequency band. In addition, in some other embodiments, the third tuning circuit 15 may not be configured, and this embodiment does not limit this.

[0130] 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 operate independently at the same frequency or adjacent frequencies with high isolation.

[0131] In one embodiment, when a first radiator 1 and a second radiator 2 form a cellular antenna, the cellular antenna can support frequency bands B1, B3, and B7. To facilitate 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 components, such as radio frequency switches. During the adjustment process, the first resonance of the first radiator 1 can be adjusted to within the corresponding first operating frequency band via the third tuning circuit 15. Then, the second tuning circuit 27 connected to the second ground point 25 on the second radiator 2 can be adjusted. The efficiency pit of the second radiator 2 can be adjusted via the second tuning circuit 27, causing the efficiency pit of the second radiator 2 to become shallower or move out of band, thereby achieving good isolation between the second radiator 2 and the first radiator 1. The first tuning circuit 26 is then adjusted to adjust the second resonance of the second radiator 2 to within the corresponding second operating frequency band, which is the same as or adjacent to the first operating frequency band. This allows for good isolation between the first radiator 1 and the second radiator 2 when operating independently at the same or adjacent frequencies, thereby achieving excellent antenna performance.

[0132] 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, thereby facilitating the adjustment of the resonant frequency of the first radiator 1 and the second radiator 2 to the same or adjacent frequencies, thereby achieving 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, no tuning devices such as capacitors and inductors are 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, thereby achieving the first radiator 1 and the second radiator 2 operating in the same frequency band.

[0133] In one embodiment, referring to FIG10 , the antenna device further includes a fourth tuning circuit 28 , one end of which is connected to the first ground point 21 and the other end to the second ground plane 210 . That is, the second radiator 2 is grounded at the first ground point 21 via the fourth tuning circuit 28 . The fourth tuning circuit 28 may also include a capacitor or an inductor, or a combination of a capacitor and an inductor, or an RF switch having multiple branches, each of which may be connected to a capacitor or an inductor. The fourth tuning circuit 28 facilitates adjusting the efficiency pit of the second radiator 2, ensuring good isolation between the second radiator 2 and the first radiator 1 . In one possible implementation, the fourth tuning circuit 28 can be coordinated with the second tuning circuit 27 to improve the adjustment accuracy of the efficiency pit and better match the isolation between the first radiator 1 and the second radiator 2. Of course, as previously described, the first ground point 21 of the second radiator 2 may also be directly connected to the second ground plane 210 without the need for tuning components such as capacitors or inductors, which will not be discussed further here. In some other embodiments, the antenna device may further include a fifth tuning circuit (not shown), one end of which is connected to the ground terminal 11 and the other end is connected to the first ground plane 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 within the corresponding first operating frequency band.

[0134] In one embodiment, FIG11 is a partial enlarged view of the electronic device provided by the fourth embodiment of the present application at the positions of the first radiator 1 and the second radiator 2. Referring to FIG11, the second radiator 2 is connected to a first tuning circuit 26 at the second feeding point 24, a second tuning circuit 27 at the second grounding point 25, and a fourth tuning circuit 28 at the first grounding point 21. In one embodiment, the first tuning circuit 26 and the second tuning circuit 27 can both include adjustable components such as radio frequency switches, and the fourth tuning circuit 28 can 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 can 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 can serve as a parasitic branch 3 of the first radiator 1 to enhance the radiation performance of the first radiator 1. Specifically, for an abnormally operating second radiator 2, since the first tuning circuit 26 of the second radiator 2 is adjusted to 0 ohms, a current intensity point is formed at the second open end 22A of the second radiator 2, and an electric field intensity point is formed at the first ground point 21. For a normally operating first radiator 1, the first open end 12 is an electric field intensity point, and the ground end 11 is a current intensity point. Therefore, when the electronic device is folded, the electric field intensity point at the first open end 12 of the first radiator 1 couples with the current intensity point at the second open end 22A of the second radiator 2, and the current intensity point at the ground end 11 of the first radiator 1 couples with the electric field intensity point at the first ground point 21 of the second radiator 2. As a result, the first radiator 1 and the second radiator 2 form a magnetoelectric coupling mode, namely a magnetic parasitic mode. The second radiator 2 acts as a parasitic branch 3 of the first radiator 1, allowing the first radiator 1 and the second radiator 2 to jointly form an antenna. The second radiator 2 can improve the radiation performance of the first radiator 1. In this embodiment, when the electronic device is used in a folded state, without using the second radiator 2 but using only the first radiator 1, the second radiator 2 can be switched to a 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, better radiation performance can be achieved through only the first radiator 1.

[0135] Figure 12 is a return loss curve diagram of the antenna device provided in an embodiment of the present application in the magnetoelectric coupling mode, where the horizontal axis is frequency and the vertical axis is return loss. Referring to Figure 12, two resonance points are generated in the 2GHz to 2.4GHz frequency band, 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.

[0136] Figure 13 is an efficiency curve diagram of the antenna device provided in an embodiment of the present application in the magnetoelectric coupling mode, where the horizontal axis is frequency and the vertical axis is efficiency. Referring to Figure 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 at the positions corresponding to the resonance points c1 and c2 shown in Figure 11, the system efficiency of the antenna device is above -3.6, and has a relatively high efficiency.

[0137] In one embodiment, FIG14 is a topological diagram of an electronic device provided in accordance with the fifth embodiment of the present application. FIG15 is a partially enlarged view of FIG14 at the locations of the first radiator 1 and the second radiator 2. Referring to FIG15 , the first tuning circuit 26 includes an RF switch, the second tuning circuit 27 is at 0 ohms, and the fourth tuning circuit 28 is at 0 ohms. The second radiator 2 can be switched to a passive parasitic mode, i.e., an electric parasitic mode, by the RF switch. The resonance point generated by the second radiator 2 can be located at a higher frequency within the resonant frequency band of the first radiator 1, thereby improving the radiation performance of the first radiator 1. FIG16 is a graph of the return loss of the antenna device in the electric parasitic mode in accordance with the fifth embodiment of the present application. The horizontal axis represents frequency, and the vertical axis represents return loss. Curve e1 represents the return loss of the first radiator 1, and curve e2 represents the return loss of the second radiator 2. Referring to FIG16 , it can be seen that the resonance point generated by the second radiator 2 can be located at a higher frequency within the resonant frequency band (2 GHz to 2.4 GHz) of the first radiator 1, thereby improving the radiation performance of the first radiator 1.

[0138] Figure 17 shows the efficiency curves of the first radiator 1 in the electric parasitic mode and the efficiency curves in the coexistence mode of the antenna device provided in the fifth embodiment of the present application. The horizontal axis represents frequency, and the vertical axis represents efficiency. Curve f1 represents the radiation efficiency of the first radiator 1 in the electric parasitic mode, curve f2 represents the system efficiency of the first radiator 1 in the electric parasitic mode, curve g1 represents the radiation efficiency of the first radiator 1 in the coexistence mode, and curve g2 represents 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 operate independently and normally when the electronic device is folded. The first radiator 1 can generate a first resonance, and the second radiator 2 can generate a second resonance. Referring to Figure 17, the radiation efficiency of the first radiator 1 in the electric parasitic mode is improved by 1.5 dB compared to the radiation efficiency in the coexistence mode, and the system efficiency is improved by 2 dB.

[0139] Figure 18 shows the efficiency curves of the second radiator 2 in the electric parasitic mode and the efficiency curves in the coexistence mode of the antenna device provided in the fifth embodiment of the present application. The horizontal axis represents frequency, and the vertical axis represents efficiency. Curve h1 represents the radiation efficiency of the second radiator 2 in the electric parasitic mode, curve h2 represents the system efficiency of the second radiator 2 in the electric parasitic mode, curve j1 represents the radiation efficiency of the second radiator 2 in the coexistence mode, and curve j2 represents 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 operate independently and normally when the electronic device is folded. Referring to Figure 17, the radiation efficiency of the second radiator 2 in the electric parasitic mode is improved by 1.8 dB compared to the radiation efficiency in the coexistence mode, and the system efficiency is improved by 3 dB.

[0140] In one embodiment, FIG19 is a partial enlarged view of the electronic device provided by the sixth embodiment of the present application at the locations of the first radiator 1 and the second radiator 2. Referring to FIG19 , the antenna device further includes a parasitic stub 3. The parasitic stub 3 is disposed on the side of the first radiator 1 having the first open end 12, with a first gap 31 between the first radiator 1 and the first open end 12. The parasitic stub 3 is not disposed on the side of the second radiator 2 having the second open end 22A. Alternatively, in another embodiment, the parasitic stub 3 is disposed on the side of the second radiator 2 having the second open end 22A, with a first gap 31 between the first radiator 2 and the second open end 22A. The parasitic stub 3 is not disposed on the side of the first radiator 1 having the first open end 12. The first radiator 1 and the second radiator 2 have the same structure and are symmetrically disposed on the corresponding first and second bodies 100 and 200. The parasitic stub 3 can attract current, creating an asymmetric current path between the two symmetrically structured and positioned radiators, thereby generating destructive currents, improving the isolation between the two radiators during independent operation, and expanding bandwidth. In an electronic device, the parasitic branch 3 can be part of the metal frame of the electronic device. Corresponding breaks such as the 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.

[0141] The above are merely preferred embodiments of the present application and are not intended to limit the present application. Persons skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A foldable electronic device, characterized in that, The electronic device includes an antenna device, a first body, a second body, and a rotating shaft. The first body and the second body are respectively disposed on two sides of the rotating shaft and are rotatably connected to the rotating shaft. The first body includes a first ground plane, and the second body includes a second ground plane. The antenna device includes: A first radiator disposed on the first body. The first radiator is provided with a grounding end and a first open end, and the grounding end is coupled to the first ground plane. The first radiator includes a first feeding point. A first feeding circuit is coupled to the first radiator through the first feeding point and is configured to feed a signal of a first operating frequency band into the first radiator. The first radiator is configured to generate a first resonance corresponding to the first operating frequency band. A second radiator disposed 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 to the second ground plane. The ratio of the length between the second open end and the third 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. A second feeding circuit is coupled to the second radiator through the second feeding point and is configured to feed a signal of a second operating frequency band into the second radiator. The second radiator is configured to generate a second resonance corresponding to the second operating frequency band. The second operating frequency band is the same as or adjacent to the first operating frequency band. A first tuning circuit, one end of the first tuning circuit is coupled to the second radiator, and the other end is coupled to the second ground plane, and is configured to tune the second resonance of the second radiator to correspond to the second operating 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.

2. The foldable electronic device according to claim 1, wherein The second radiator includes a second grounding point, and the second grounding point is disposed 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 grounding point, and the other end is connected to the second ground plane.

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

4. The foldable electronic device according to claim 2, wherein, 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.

5. The foldable electronic device according to any one of claims 1-4, characterized in that, The grounding end is electrically connected to the first ground plane.

6. The foldable electronic device according to any one of claims 1-4, characterized in that, At least a part of the first radiator, the grounding end, and the first ground plane are integrally formed.

7. The foldable electronic device according to any one of claims 1-6, characterized in that, The electrical length between the grounding end and the first open end of the first radiator is 1 / 4λ, where λ is the wavelength corresponding to the first operating frequency band range.

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

9. The foldable electronic device according to any one of claims 2-6, 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 is connected to the first ground plane.

10. The foldable electronic device according to claim 9, wherein, The third tuning circuit includes a capacitor and / or an inductor and / or a radio frequency switch for tuning the first resonance to correspond to the first operating frequency band.

11. The foldable electronic device according to claim 9, wherein, The first tuning circuit includes a first inductor, the third tuning circuit includes a second inductor, and the inductance value of the first inductor is less than the inductance value of the second inductor.

12. The foldable electronic device according to any one of claims 1-10, 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 1-4, characterized in that, It further includes a fourth tuning circuit, one end of the fourth tuning circuit is connected to the first grounding point, and the other end is connected to the second ground plane.

14. The foldable electronic device according to claim 13, wherein, The fourth tuning circuit includes a capacitor and / or an inductor and / or a radio frequency switch for adjusting the efficiency pit of the second radiator.

15. The foldable electronic device according to any one of claims 1-14, characterized in that, It further includes parasitic branches, the parasitic branches are arranged on the side of the first radiator having the first open end and have a first gap with the first open end; or, the parasitic branches are arranged on the side of the second radiator having the second open end and have a first gap with the second open end.

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

17. The foldable electronic device according to any one of claims 1-16, characterized in that, 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.

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

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

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

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