Foldable electronic device

Abstract

The application provides a foldable electronic device, wherein the antenna device comprises a first radiator, a second radiator, a first feeding circuit, a second feeding circuit and a first tuning circuit. The length of the second radiator between a third open end and a second open end is greater than the length of the first radiator between a ground end and a first open end. In the folded state of the electronic device, the projections of the first open end and the second open end at least partially coincide, and the projection of the ground end is located between the first ground point and the second open end. The first tuning circuit is used for adjusting the second working frequency band to be the same as or adjacent to the first working frequency band. In the application, the electric field intensity points of the two radiators are coupled to form a first current path, the current intensity points of the two radiators are coupled to form a second current path, and the directions of the two current paths are opposite to each other, so that good isolation can be obtained when the two radiators independently work in the same frequency band or adjacent frequency bands.

Description

Technical Field

[0001] This application relates to the field of communication technology, and more specifically to a foldable electronic device. Background Technology

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

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

[0004] This application provides a foldable electronic device, comprising an antenna device, a first body, a second body, and a pivot. The first body and the second body are respectively disposed on both sides of the pivot and rotatably connected to it. The first body includes a first ground plane, and the second body includes a second ground plane. The antenna device includes a first radiator, a second radiator, a first feed circuit, a second feed circuit, and a first tuning circuit. The first radiator is disposed on the first body and has a ground terminal and a first open terminal. The ground terminal is coupled to the first ground plane. The first radiator includes a first feed point. The first feed circuit is coupled to the first radiator through the first feed point and is used to feed a signal of a first operating frequency band to the first radiator. The first radiator is used to generate a first resonance corresponding to the first operating frequency band. A second radiator is disposed on the second body. The second radiator has 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 of the second radiator between the third open end and the second open end to the length of the first radiator between the grounding end and the first open end is greater than 1 and less than or equal to 2. The second radiator includes a second feed point. A second feed circuit is coupled to the second radiator through the second feed point and is used to feed a signal of a second operating frequency band to the second radiator. The second radiator is used 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 ground plane, for adjusting 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.

[0005] In this application, by connecting a first tuning circuit at the second feed 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. Simultaneously, 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. The projection of the ground end is located between the first ground point and the second open end. When the first feed circuit feeds the first radiator through the first feed point, and the second feed circuit feeds the second radiator through the second feed point, electric field strength points can be formed at both the first and second open ends. Since the projections of the first and second open ends along the thickness direction of the electronic device at least partially overlap, the electric field strength points at the first and second open ends can be coupled together, generating a first current path. Meanwhile, the grounding terminal of the first radiator and the first grounding point of the second radiator are respectively strong current points. The strong current points of the two radiators can couple 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 satisfy the phase cancellation condition, the two radiators can achieve good isolation when working in the same frequency band or adjacent frequency bands, so that the two radiators can work independently and normally when the electronic device is folded.

[0006] In one possible implementation, the second radiator includes a second grounding point disposed between the first grounding point and the second feed point. The antenna assembly also includes a second tuning circuit, one end of which is connected to the second grounding point and the other end to the second ground plane. This second tuning circuit can adjust the efficiency dip of the second radiator, making the efficiency dip shallower or moving it out of band, thereby achieving higher isolation between the two radiators and enabling both radiators to obtain better antenna performance.

[0007] In one possible implementation, the second tuning circuit includes a capacitor and / or an inductor and / or an RF switch. The second tuning circuit may include a capacitor or an inductor, or a combination of capacitors and inductors, or include an RF switch with multiple branches, each of which may be connected to a capacitor or inductor. This allows for greater design flexibility of the second tuning circuit, enabling it to adapt to various application scenarios.

[0008] In one possible implementation, when the electronic device is in a folded state, the projection of the grounding terminal, along the thickness direction of the electronic device, is at least partially located between the projections of the first grounding point and the second grounding point. The grounding terminal, the first grounding point, and the second grounding point are staggered, resulting in different ground return paths for the grounding terminal and the first grounding point. This improves the isolation between the first radiator and the second radiator during operation. Simultaneously, the different ground return paths of the grounding terminal and the second grounding point facilitate the adjustment of the efficiency pit through a second tuning circuit connected to the second grounding point, ensuring that the current paths of the first radiator and the second radiator satisfy the phase cancellation condition. This allows for better isolation when the first radiator and the second radiator operate independently in the folded state of the electronic device.

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

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

[0011] In one possible implementation, the electrical length of the first radiator between the ground terminal and the first open terminal is [value missing]. 1 / 4 λ, where λ is the wavelength corresponding to the first operating frequency band. A first radiator with this electrical length can achieve both good signal transmission and reception quality and a small structural size, which is beneficial for miniaturizing the antenna device.

[0012] In one possible implementation, the electrical length of the second radiator between the first grounding point and the second open terminal is between 1 / 4 λ~ 1 / 2 The wavelength is between λ, where λ corresponds to the wavelength within the second operating frequency band. The second radiator has a larger electrical length than the first radiator, which improves the 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.

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

[0014] In one possible implementation, the third tuning circuit includes a capacitor and / or an inductor and / or a radio frequency switch for adjusting the first resonance to correspond to the first operating frequency band. This 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 a combination of capacitors and inductors, or include a radio frequency switch with multiple branches, each of which can be connected to a capacitor or an inductor. This allows for more flexible design of the third tuning circuit, facilitating various application scenarios. During the adjustment of the performance parameters of the first and second radiators, the first resonance of the first radiator can be adjusted to the corresponding first operating frequency band using the third tuning circuit. Then, the second tuning circuit connected to the second ground point on the second radiator can be adjusted. The second tuning circuit can adjust the efficiency dip of the second radiator, making the efficiency dip shallower or moving it out of band, thus achieving better isolation between the second and first radiators. Then, the first tuning circuit is adjusted so that the second resonance of the second radiator is located in the corresponding second operating frequency band, which is the same as or adjacent to the first operating frequency band. This allows the first and second radiators to have good isolation when they operate independently at the same or adjacent frequencies, thus achieving excellent antenna performance.

[0015] 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 that of the second inductor, which is beneficial to adjust the resonant frequencies of the first radiator and the second radiator to the same or adjacent frequencies, thereby enabling the first radiator and the second radiator to operate at the same frequency or adjacent frequencies.

[0016] In one possible implementation, the distance between the first feed point and the first open end is less than 7.5 mm, and the distance between the second feed point and the second open end is less than 7.5 mm. This allows the first feed point to be closer to the first open end, and the second feed point to be closer to the second open end, thus creating a strong electric field point at both the first and second open ends of the first and second radiators. When the electronic device is folded, the strong electric field points of the first and second radiators can couple to form a current path. This current path can then cancel out another current path formed by coupling the grounding ends of the two radiators, thereby improving the isolation between the two radiators when operating independently.

[0017] In one possible implementation, the electrical length between the first feed point and the first open terminal is less than [a certain value]. 1 / 8 λ, where λ is the wavelength corresponding to the first operating frequency band, and the electrical length between the second feed point and the second open terminal is less than 1 / 2 λ. 1 / 8 λ, where λ is the wavelength corresponding to the second operating frequency band. Therefore, the first feed point can be made closer to the first open terminal, and the second feed point can be made closer to the second open terminal, which will not be elaborated further here.

[0018] In one possible implementation, the first radiator is disposed on the side of the first body away from the pivot, and the second radiator is disposed on the side of the second body away from the pivot. When the electronic device is in a flattened state, there is a large distance between the first and second radiators, thus providing good isolation when they operate independently. When the electronic device is in a folded state, the first and second radiators are closer together, and the path formed by the strong electric field coupling of the two radiators cancels out the other current path formed by the strong current coupling, also providing good isolation when the two radiators operate independently.

[0019] In one possible implementation, the first radiator is disposed on the side of the first body adjacent to the rotating shaft, and the second radiator is disposed on the side of the second body adjacent to the rotating shaft. Both the first and second radiators are located on the same side of the electronic device along the axial direction of the rotating shaft. When the electronic device is in a flattened state, the first and second radiators can also have a large distance between them, thus providing good isolation when they operate independently. When the electronic device is in a folded state, the first and second radiators are closer together, and the path formed by the strong electric field coupling of the two radiators cancels out the other current path formed by the strong current coupling, further enhancing isolation when the two radiators operate independently.

[0020] In one possible implementation, the antenna device further includes a fourth tuning circuit, one end of which is connected to the first grounding point and the other end to the second ground plane. This fourth tuning circuit facilitates the adjustment of the efficiency dip of the second radiator, thereby achieving good isolation between the second radiator and the first radiator.

[0021] In one possible implementation, the fourth tuning circuit includes a capacitor and / or an inductor and / or an RF switch for adjusting the efficiency dip of the second radiator. In another possible implementation, the fourth tuning circuit can work in conjunction with the second tuning circuit to improve the adjustment accuracy of the efficiency dip and better match the isolation between the first and second radiators.

[0022] In one possible implementation, the antenna device further includes a parasitic stub, which is disposed on the same side of the first radiator having the first open end, and has a first gap between it and the first open end; or, the parasitic stub is disposed on the side of the second radiator having the second open end, and has a first gap between it and the second open end. The first and second radiators have identical structures and are symmetrically disposed on their respective first and second bodies. This parasitic stub can attract current to create an asymmetrical current path between the two radiators, which are structurally and positionally symmetrical. This allows for the generation of destructive currents, improving the isolation between the two radiators during independent operation and extending the bandwidth.

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

[0024] In one possible implementation, the minimum difference between the frequencies of the first and second operating frequency bands is less than or equal to 200MHz. If the first and second radiators employ the same structure and are symmetrically arranged in the electronic device, then in the folded state of the electronic device, when the difference in the resonant frequencies of the two radiators is within 200MHz, the isolation between the two radiators is poor, resulting in poor radiation performance. In this 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 a first tuning circuit, achieving a resonant frequency difference within 200MHz. Simultaneously, by making the distance between the second radiator's second open terminal and the first grounding point greater than the distance between the first radiator's first open terminal and the grounding point, current paths can be canceled, improving the isolation between the two radiators when operating independently with a resonant frequency difference within 200MHz, thereby improving the radiation performance of both radiators.

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

[0026] In one possible implementation, the communication frequency bands corresponding to the signals of the first operating frequency band and the second operating frequency band are between 2.3 GHz and 2.7 GHz.

[0027] In one possible implementation, the resonant point of the first resonance is in the range of 2.5 GHz to 2.7 GHz, and the resonant point of the second resonance is in the range of 2.4 GHz to 2.5 GHz. Alternatively, the resonant point of the first resonance is in the range of 2.4 GHz to 2.5 GHz, and the resonant point of the second resonance is in the range of 2.3 GHz to 2.4 GHz. Or, the resonant point of the first resonance is in the range of 1710 MHz to 2170 MHz, and the resonant point of the second resonance is in the range of 1575 MHz to 1630 MHz. In other words, in the antenna device provided by this application, the two radiators can achieve good isolation when operating independently in numerous adjacent frequency bands, demonstrating excellent radiation performance.

[0028] In one possible implementation, when the first radiator and the second radiator operate simultaneously, the first radiator generates the first resonance, and the second radiator generates the second resonance. That is, the first radiator and the second radiator can coexist; that is, the first radiator generates the first resonance when it operates, and the second radiator generates the second resonance when it operates. In this coexisting state, there is good isolation between the first radiator and the second radiator, and both exhibit excellent radiation performance.

[0029] It should be understood that the above general description and the following detailed description are merely exemplary and do not limit this application. Attached Figure Description

[0030] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is a schematic diagram of the structure of the electronic device provided in the embodiments of this application;

[0032] Figure 2 A partial schematic diagram of an electronic device provided in one embodiment of this application;

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

[0034] Figure 4 for Figure 3 A magnified view of the locations of the first and second radiators;

[0035] Figure 5 A return loss and isolation curve of the antenna device provided in the first embodiment of this application;

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

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

[0038] Figure 8 for Figure 7 A magnified view of the locations of the first and second radiators;

[0039] Figure 9 A topology diagram of an electronic device provided in the third embodiment of this application;

[0040] Figure 10 for Figure 9 A magnified view of the locations of the first and second radiators;

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

[0042] Figure 12 Return loss curve of the antenna device provided in the embodiments of this application in the magneto-electric coupling mode;

[0043] Figure 13 Efficiency curve of the antenna device provided in the embodiment of this application in the magneto-electric coupling mode;

[0044] Figure 14 A topology diagram of an electronic device provided in the fifth embodiment of this application;

[0045] Figure 15 for Figure 14 A magnified view of the locations of the first and second radiators;

[0046] Figure 16 A return loss curve of the antenna device in the electronic device provided in the fifth embodiment of this application in the electrical parasitic mode;

[0047] Figure 17 A comparison diagram of the efficiency curves of the first radiator in the antenna device provided in the fifth embodiment of this application in the electrical parasitic mode and in the coexistence mode.

[0048] Figure 18 A comparison diagram of the efficiency curves of the second radiator in the antenna device provided in the fifth embodiment of this application in the electrical parasitic mode and in the coexistence mode.

[0049] Figure 19 A partial enlarged view of the electronic device provided in the sixth embodiment of this application at the positions of the first radiator and the second radiator.

[0050] Figure label:

[0051] 100-First ontology;

[0052] 110 - First Floor;

[0053] 200 - Second Body;

[0054] 210 - Second floor;

[0055] 300 - Display screen;

[0056] 400-spindle;

[0057] 1-First radiator;

[0058] 11-Grounding terminal;

[0059] 12-First Open Terminal;

[0060] 13-First power supply circuit;

[0061] 14 - First feed point;

[0062] 15-Third tuning circuit;

[0063] 2-Second radiator;

[0064] 21 - First grounding point;

[0065] 22A - Second Open Terminal;

[0066] 22B - Third Open Terminal;

[0067] 23-Second feeder circuit;

[0068] 24 - Second feed point;

[0069] 25 - Grounding point;

[0070] 26-First tuning circuit;

[0071] 27-Second tuning circuit;

[0072] 28 - Fourth tuning circuit.

[0073] 3- Parasitic nodes;

[0074] 31 - First gap. Detailed Implementation

[0075] To better understand the technical solution of this application, the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0076] It should be understood that the described embodiments are merely some, not all, of the embodiments in this application. All other embodiments obtained by those skilled in the art based on the embodiments in this application without inventive effort are within the scope of protection of this application.

[0077] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. The singular forms “a,” “the,” and “the” used in the embodiments of this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0078] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0079] In the description of this application, unless otherwise expressly specified and limited, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance; unless otherwise specified or explained, the term "multiple" refers to two or more; the terms "connected," "fixed," etc., should be interpreted broadly. For example, "connected" can be 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. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0080] A radiator, or antenna stub, is a device in an antenna used to receive / transmit electromagnetic wave radiation. In some cases, the term "antenna" is narrowly defined as a radiator, which converts guided wave energy from the transmitter into radio waves, or converts radio waves into guided wave energy, for radiating and receiving radio waves. The modulated high-frequency current energy (or guided wave energy) generated by the transmitter is transmitted to the transmitting radiator via a feed line, where it is converted into electromagnetic wave energy of a specific polarization and radiated in the desired direction. The receiving radiator converts electromagnetic wave energy of a specific polarization from a specific direction in space back into modulated high-frequency current energy, which is then transmitted to the receiver input via a feed line.

[0081] Radiators (or antenna stubs) may include conductors with specific shapes and sizes, such as wires or sheets, and this application does not limit the specific shape. In one embodiment, a wire radiator may be simply referred to as a wire antenna. In one embodiment, a wire radiator may be implemented by a conductive frame, and may also be called a frame antenna. In one embodiment, a wire radiator may be implemented by a support conductor, and may also be called a support antenna. In one embodiment, the wire diameter (e.g., including thickness and width) of the wire radiator, or the radiator of the wire antenna, is much smaller than the wavelength (e.g., the wavelength of the medium) (e.g., less than 1 / 16 of the wavelength), and the length may be comparable to the wavelength (e.g., the wavelength of the medium) (e.g., a length of approximately 1 / 8 of the wavelength, or 1 / 8 to 1 / 4, or 1 / 4 to 1 / 2, or longer). The main forms of wire antennas include dipole antennas, half-wave dipole antennas, monopole antennas, loop antennas, and inverted F antennas (also known as IFAs). For example, in a dipole antenna, each dipole antenna typically includes two radiating stubs, each fed from the feed end of the radiating stub by a feed section. For example, an inverted-F antenna (IFA) can be considered as a monopole antenna with an added ground path. An IFA antenna has one feed point and one ground point, and is called an inverted-F antenna because its side view is inverted-F shaped. 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). In one embodiment, the sheet radiator may be implemented using a planar conductor (e.g., a conductive sheet or conductive coating). In one embodiment, the sheet radiator may include a conductive sheet, such as a copper sheet. In one embodiment, the sheet radiator may include a conductive coating, such as silver paste. The shape of the sheet radiator includes circular, rectangular, and annular shapes, and this application does not limit the specific shape. The structure of a microstrip antenna generally consists of a dielectric substrate, a radiator, and a ground plane, wherein the dielectric substrate is disposed between the radiator and the ground plane.

[0082] Radiators (or antenna stubs) may also include slots or gaps formed on a conductor, for example, closed or semi-closed slots or gaps formed on a grounded conductor surface. In one embodiment, a slotted or slit radiator may be simply referred to as a slot antenna or a gap antenna. In one embodiment, the radial dimension (e.g., including width) of the slot or gap of the slot antenna / gap antenna is much smaller than the wavelength (e.g., the dielectric wavelength) (e.g., less than 1 / 16 of the wavelength), while the length dimension may be comparable to the wavelength (e.g., the dielectric wavelength) (e.g., a length of 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 gap may be simply referred to as a closed slot antenna. In one embodiment, a radiator with a semi-closed slot or gap (e.g., an opening added to a closed slot or gap) may be simply referred to as an open slot antenna. In some embodiments, the gap shape is elongated. In some embodiments, the length of the gap is approximately half a wavelength (e.g., the dielectric wavelength). In some embodiments, the length of the gap is approximately an integer multiple of a wavelength (e.g., one dielectric wavelength). In some embodiments, the slot can be fed by transmission lines connected across one or both sides, thereby exciting a radio frequency electromagnetic field on the slot and radiating electromagnetic waves into space. In one embodiment, the radiator of the slot antenna or gap antenna can be implemented by a conductive frame grounded at both ends, also known as a frame antenna; in this embodiment, the slot antenna or gap antenna can be viewed as including a linear radiator, the linear radiator being spaced apart from the ground and grounded at both ends, thereby forming a closed or semi-closed slot or gap. In one embodiment, the radiator of the slot antenna or gap antenna can be implemented by a support conductor grounded at both ends, also known as a support antenna.

[0083] Coupling can be understood as direct coupling and / or indirect coupling. "Coupled connection" can be understood as a direct coupling connection and / or indirect coupling connection. Direct coupling can also be called "electrical connection," which can be understood as physical contact and electrical conduction between components; it can also be understood as the form of connection between different components in a circuit structure through physical lines that can transmit electrical signals, such as copper foil or wires on a printed circuit board (PCB). "Indirect coupling" can be understood as electrical conduction between two conductors through a gap / non-contact method. 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 gaps between two conductive components.

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

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

[0086] Communication / Operating Frequency Band: Regardless of the type of antenna, it always operates within a certain frequency range (bandwidth). For example, an antenna supporting the B40 band operates within the frequency range of 2300MHz to 2400MHz, or in other words, its operating frequency band includes the B40 band. The frequency range that meets the specifications can be considered 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. Bandwidth can be considered as a frequency range on both sides of the center frequency (e.g., the resonant frequency of a dipole), where the antenna characteristics are within the acceptable range of the center frequency.

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

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

[0089] It should be understood that the wavelength of a radiation signal in air can be calculated as follows: (air wavelength, or vacuum wavelength) = speed of light / frequency, where the 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 a radiation signal in a medium can be calculated as follows: Where ε is the relative permittivity of the medium. The wavelength in the embodiments of this application typically refers to the medium wavelength, which can be the medium wavelength corresponding to the center frequency of the resonant frequency, or the medium wavelength corresponding to the center frequency of the operating frequency band supported by the antenna. For example, assuming the center frequency of the B1 uplink band (resonant frequency of 1920MHz to 1980MHz) is 1955MHz, then the wavelength can be the medium wavelength calculated using this frequency. Not limited to the center frequency, the "medium wavelength" can also refer to the medium wavelength corresponding to the non-center frequency of the resonant frequency or operating frequency band. For ease of understanding, the medium wavelength mentioned in the embodiments of this application can be simply calculated using the relative permittivity of the medium filling one or more sides of the radiator.

[0090] End / Point: The term "end / point" in the context of the antenna radiator's first end / second end / feed end / ground end / feed point / ground point / connection point should not be narrowly interpreted as necessarily being a point or end physically disconnected from other radiators. It can also be considered as a point or segment on a continuous radiator. In one embodiment, "end / point" can include a connection / coupling region on the antenna radiator that is coupled to other conductive structures. For example, a feed end / feed point can be a coupling region on the antenna radiator that is coupled to a feed structure (e.g., a region facing a part of the feed structure). Similarly, a ground end / ground point can be a connection / coupling region on the antenna radiator that is coupled to a ground structure.

[0091] Open terminal, ground terminal: In some embodiments, the open terminal and ground terminal are, for example, relative to whether or not they are grounded; the ground terminal is grounded, and the open terminal is not grounded. In some embodiments, the open terminal and ground terminal are, for example, relative to other conductors; the ground terminal is electrically connected to other conductors, and the open terminal is not electrically connected to other conductors. In one embodiment, the open terminal may also be referred to as a floating terminal, free terminal, open terminal, or open circuit terminal. In one embodiment, the ground terminal may also be referred to as a ground terminal or short circuit terminal. It should be understood that in some embodiments, other conductors can be coupled through the open terminal to transfer coupled energy (which can be understood as transferring current).

[0092] A power supply circuit is a combination of all circuits used for receiving and transmitting radio frequency (RF) signals. It can include a transceiver and an RF front-end. In some cases, the term "power supply circuit" is narrowly interpreted as an RF IC (Radio Frequency Integrated Circuit), which can be considered to include both the RF front-end chip and the transceiver. The power supply circuit has the function of converting radio waves (e.g., RF signals) into electrical signals (e.g., digital signals). It is generally considered part of the RF component.

[0093] 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 to test the characteristics of the RF front-end circuitry or the radiator of the antenna. The RF front-end circuitry can be considered as the circuitry coupled between the test socket and the transceiver.

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

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

[0096] It should also be understood that the two feed circuits in the first / second / ...Nth feed circuit of this application typically correspond to two RF test sockets in an electronic device.

[0097] A tuning circuit is a circuit associated with adjusting the resonant frequency of an antenna. In one embodiment, the tuning circuit is coupled between the radiator and the ground. In another embodiment, the tuning circuit is coupled between the feed circuit and the radiator. In yet another embodiment, the tuning circuit functions as impedance matching and / or frequency tuning. Typically, it is considered part of the antenna.

[0098] In one embodiment, the tuning circuit may include switches and / or electronic components / devices, wherein the switches may be electronic components / devices for switching the coupling connection of the radiator. The switches in the tuning circuit may also be referred to as antenna switches.

[0099] Ground / Plug: This can broadly refer to at least a portion of any grounding layer, ground plane, or grounding metal layer within an electronic device (such as a mobile phone), or at least a portion of any combination of the aforementioned grounding layers, ground planes, or grounding components. "Ground / Plug" can be used for grounding components within an electronic device. In one embodiment, "Ground / Plug" may include any one or more of the following: a grounding layer of a circuit board of an electronic device, a ground plane formed by the frame of the electronic device, a grounding metal layer formed by a thin metal film beneath the screen, a conductive grounding layer of a battery, and conductive or metallic components electrically connected to the aforementioned grounding layer / ground plane / metal layer. In one embodiment, the circuit board may be a printed circuit board (PCB), such as an 8-layer, 10-layer, or 12-14-layer board having 8, 10, 12, 13, or 14 layers of conductive material, or components separated and electrically insulated by dielectric or insulating layers such as glass fiber or polymers. In one embodiment, the circuit board includes a dielectric substrate, a grounding layer, and a trace layer, with the trace layer and grounding layer electrically connected via vias. In one embodiment, components such as displays, touchscreens, input buttons, transmitters, processors, memory, batteries, charging circuits, and system-on-chip (SoC) architectures can be mounted on or connected to a circuit board; or electrically connected to trace layers and / or ground layers in the circuit board. For example, an RF source is disposed on a trace layer.

[0100] Any of the aforementioned grounding layers, ground planes, or grounding metal layers are made of conductive materials. In one embodiment, the conductive material may be any of the following: copper, aluminum, stainless steel, brass and their alloys, copper foil on an insulating substrate, aluminum foil on an insulating substrate, gold foil on an insulating substrate, silver-plated copper, silver-plated copper foil on an insulating substrate, silver foil on an insulating substrate and tin-plated copper, graphite-impregnated cloth, graphite-coated substrates, copper-plated substrates, brass-plated substrates, and aluminum-plated substrates. Those skilled in the art will understand that grounding layers / ground planes / grounding metal layers may also be made of other conductive materials.

[0101] Grounding: refers to coupling with the aforementioned ground / floor via a grounding structure and / or grounding circuit. In one embodiment, grounding can be achieved through physical grounding, such as through a structural component of the mid-frame to achieve physical grounding at a specific location on the frame (or, physical ground). In another embodiment, grounding can be achieved through device grounding, such as through devices like capacitors / inductors / resistors connected in series or parallel (or, device ground).

[0102] In foldable device designs, some models have antennas positioned on either side of the hinge. When the phone is folded, the antennas on either side of the hinge are close to each other, which can lead to poor isolation and reduced antenna performance when the two antennas operate independently. To mitigate the impact of isolation, these two antennas need to operate at low and mid-to-high frequencies respectively, rather than operating at the same frequency or with a small frequency difference.

[0103] Antenna system efficiency: refers to the ratio of the power radiated into space by the antenna (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; that is, the antenna's system efficiency is the antenna's actual efficiency (i.e., effectiveness).

[0104] Antenna radiation 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 active power input to the antenna. The active power input to the antenna equals the antenna's input power minus the power loss. Power loss mainly includes return loss power, ohmic loss power of the metal, and / or dielectric loss power. Radiation efficiency is a measure of an antenna's radiation capability; metal loss and dielectric loss are both factors affecting radiation efficiency.

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

[0106] Antenna return loss: This can be understood as the ratio of the signal power reflected back to the antenna port after passing through the antenna circuit to the transmit power at the antenna port. The smaller the reflected signal, the larger the signal radiated into space through the antenna, and the higher the antenna's radiation efficiency. Conversely, the larger the reflected signal, the smaller the signal radiated into space through the antenna, and the lower the antenna's radiation efficiency.

[0107] Antenna return loss can be represented by the S11 parameter, which is one of the S-parameters. S11 represents the reflection coefficient, and this parameter characterizes the antenna's transmission efficiency.

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

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

[0110] Antenna isolation refers to the ratio of the signal received by one antenna through another to the signal received by the transmitting antenna. Isolation is a physical quantity used to measure the degree of mutual coupling between antennas. Assuming two antennas form a two-port network, the isolation between the two antennas is represented by their S21 and S12 values. Antenna isolation can be expressed using the S21 and S12 parameters. These parameters are typically negative. 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. Antenna isolation depends on factors such as the antenna radiation pattern, the spatial distance between the antennas, and the antenna gain.

[0111] The technical solutions provided in this application are applicable to electronic devices employing 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 devices in this application can be foldable electronic devices, such as foldable mobile phones, foldable tablets, and foldable smart home devices. This application does not limit these possibilities. Figure 1 An electronic device provided in an embodiment of this application is illustrated, with a foldable mobile phone as an example.

[0112] Reference Figure 1 The electronic device includes a first body 100, a second body 200 and a rotating shaft 400. The first body 100 and the second body 200 are respectively disposed on both sides of the rotating shaft 400 and are rotatably connected to the rotating shaft 400. Figure 2 This is a partial schematic diagram of an electronic device provided in one embodiment of this application, with reference to... Figure 2The first body 100 includes a first floor 110, and the second body 200 includes a second floor 210. The first floor 110 and the second floor 210 can be printed circuit boards, 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 foldable electronic devices such as foldable mobile phones and foldable tablets. These devices include a display screen 300, which can cover the first body 100, the second body 200, and the hinge 400 for display. In one embodiment, both the first body 100 and the second body 200 can include a metal frame, metal border, or other components of the electronic device, or can serve as the outer casing of the electronic device. In one embodiment, the electronic device provided in this embodiment also includes an antenna device, where a first radiator 1 can be disposed on the first body 100, and a second radiator 2 can be disposed on the second body 200. When the electronic device is in an unfolded or folded state, the two radiators can function as two independent antennas. Of course, when the electronic device is in a folded state, one of the two radiators can act as a parasitic branch 3 of the other, so that the two radiators can form an antenna to work.

[0113] In one embodiment, Figure 3 A topology diagram of an electronic device provided in one embodiment of this application, with reference to Figure 3 The antenna device includes a first radiator 1, a first feeding circuit 13, a second radiator 2, and a second feeding circuit 23. The first radiator 1 can be disposed on the first body 100 and can move synchronously with the first body 100. Figure 4 for Figure 3 A partial enlarged view at the locations of the first radiator 1 and the second radiator 2, with reference to... Figure 4 The first radiator 1 is provided with a grounding terminal 11 and a first open terminal 12. The grounding terminal 11 is coupled to the first ground plane 110 for grounding. In one embodiment, the grounding terminal 11 can be directly connected to the first ground plane 110. In another embodiment, the grounding terminal 11 can also be indirectly connected to the first ground plane 110 through devices such as capacitors, inductors, and RF switches. In one embodiment, at least a portion of the grounding terminal 11, the first radiator 1, and the first ground plane 110 can be integrally formed, thereby achieving grounding in the field through a simplified process (compared to device grounding). In one embodiment, the mid-frame of an electronic device such as a mobile phone can be an integrally formed structure, and a portion of the mid-frame can be reused as the first radiator 1, the grounding terminal 11, and the first ground plane 110 in this application. In one embodiment, the first ground plane 110 can be the middle plate portion of the inner mid-frame of an electronic device such as a mobile phone.

[0114] The first open terminal 12 does not contact the first ground plane 110. The first radiator 1 includes a first feed point 14, and the first feed circuit 13 is coupled to the first radiator 1 through the first feed point 14 for feeding a signal of a first operating frequency band into the first radiator 1. The first radiator 1 is used to generate a first resonance corresponding to the first operating frequency band.

[0115] The second radiator 2 can be disposed on the second body 200 and can move synchronously with the second body 200. (See reference...) Figure 4 The second radiator 2 is provided with a first grounding point 21, a second open terminal 22A, and a third open terminal 22B. The first grounding point 21 is located between the second open terminal 22A and the third open terminal 22B, and is coupled to the second ground plane 210 for grounding. The first grounding point 21 can be directly connected to the second ground plane 210, or it can be indirectly connected to the second ground plane 210 through a device. Neither the second open terminal 22A nor the third open terminal 22B is in contact with the second ground plane 210. The second radiator 2 includes a second feed point 24, and a second feed circuit 23 is coupled to the second radiator 2 through the second feed point 24 to feed a signal of a second operating frequency band into the second radiator 2. The second radiator 2 is used 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 frequency of the resonant point of the first resonance is higher than the frequency of the resonant point of the second resonance.

[0116] In one embodiment, as described above, both the first body 100 and the second body 200 may include a metal frame or metal border of the electronic device. The first radiator 1 and the second radiator 2 can reuse the border of the electronic device, that is, a portion of the border of the electronic device can serve as the first radiator 1 and the second radiator 2, thereby reducing the space occupied by the radiators in the electronic device and facilitating the miniaturization design of the electronic device. In another embodiment, both the first body 100 and the second body 200 include a housing, which can be a plastic housing or a metal housing, or a housing formed by setting a metal layer inside a plastic housing. The first radiator 1 and the second radiator 2 can both be disposed within the housing. Where the internal space of the electronic device is large enough, the antenna device can be installed entirely inside the housing, thereby facilitating the disassembly, assembly, and maintenance of the antenna device.

[0117] When the electronic device is in its unfolded state, the first radiator 1 and the second radiator 2 are far apart, achieving good isolation and allowing each to operate independently. When the electronic device is in its folded state, the first body 100 and the second body 200 are aligned, and the first radiator 1 and the second radiator 2 are closer together. If the first radiator 1 and the second radiator 2 have the same structure and dimensions, for example, if the electrical lengths of the two radiators are both... 1 / 4 λ, where λ is the wavelength, indicates that when two antennas operate at the same or adjacent frequencies, their isolation is poor, resulting in poor radiation performance. This makes it impossible for the two antennas to operate independently when the electronic device is folded. In this case, to maximize the isolation between the two radiators and ensure their radiation performance when operating independently, they are typically operated at different frequency bands with a significant frequency difference. For example, one radiator operates at a low frequency band, and the other at a mid-to-high frequency band. This significantly limits the operating frequency range of the antennas.

[0118] Therefore, in one embodiment, reference is made to Figure 4The 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 near the second feed point 24. In another embodiment, one end of the first tuning circuit 26 can be coupled to the second feed point 24, for example, by sharing a spring (commonly referred to as a feed spring) to achieve electrical connection with the second radiator 2. The other end of the first tuning circuit 26 is coupled to a second ground plane 210, 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 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. The projection of the ground end 11 is located between the projections of the third open end 22B and the second open end 22A. Here, "located between the projections of the third open end 22B and the second open end 22A" should be understood as the projection of the ground end 11 not overlapping with the projections of the third open end 22B and the second open end 22A. When the first feeding circuit 13 feeds the first radiator 1 through the first feeding point 14, and the second feeding circuit 23 feeds the second radiator 2 through the second feeding point 24, electric field strength points can be formed at both the first open end 12 and the second open end 22A. Since the projections of the first open end 12 and the second open end 22A along the thickness direction of the electronic device at least partially overlap, the electric field strength points of the first open end 12 and the second open end 22A can be coupled to each other, generating a first current path. At the same time, the grounding end 11 of the first radiator 1 and the first grounding point 21 of the second radiator 2 are current strength points, and the current strength 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 satisfy the phase cancellation condition, the two radiators can achieve good isolation when operating in the same or adjacent frequency bands, enabling the two radiators to operate independently and normally in the folded state of the electronic device. The first tuning circuit 26 may include a capacitor or an inductor, or a combination of capacitors and inductors, or it 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 can adjust the resonant frequency of the second radiator 2 to increase its resonant frequency, making it the same as or adjacent to the resonant frequency of the first radiator 1.

[0119] Figure 5The return loss and isolation curves of the antenna device provided in the first embodiment of this application are shown in the figure. Figure 5 Curve a1 represents the return loss curve of the first radiator 1, curve a2 represents the isolation curve of the first radiator 1, curve b1 represents the return loss curve of the second radiator 2, and curve b2 represents the isolation curve of the second radiator 2. From curves a1 and b1, it can be seen that the first radiator 1 and the second radiator 2 operate in the same resonant frequency band (around 2.04 GHz). From curves a2 and b2, it can be seen that curves a2 and b2 almost overlap, and the isolation is below -15 dB, indicating good isolation. Therefore, the antenna device provided in this 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 located on the side of the first body 100 away from the rotating shaft 400, and the second radiator 2 is located on the side of the second body 200 away from the rotating shaft 400. When the electronic device is in a flattened state, there is a large distance between the first radiator 1 and the second radiator 2, thus providing 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 closer together, and the path formed by the strong electric field coupling of the two radiators cancels out the other current path formed by the strong current coupling, which also provides good isolation between the two radiators when they operate independently.

[0120] In another embodiment, Figure 6 A partial schematic diagram of an electronic device provided in another embodiment of this application, with reference to... Figure 6 The first radiator 1 is disposed on the first body 100 adjacent to the rotating shaft 400, and the second radiator 2 is disposed on the second body 200 adjacent to the rotating shaft 400. Both the first radiator 1 and the second radiator 2 are located on the same side of the electronic device along the axial direction of the rotating shaft 400. When the electronic device is in a flattened state, the first radiator 1 and the second radiator 2 can maintain a relatively large distance, thus providing good isolation when they operate independently. When the electronic device is in a folded state, the first radiator 1 and the second radiator 2 are closer together. The electric field strong point coupling between the two radiators cancels out the current strong point coupling, further enhancing isolation when they operate independently.

[0121] In one embodiment, reference is made to... Figure 4The 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. This allows the first feed point 14 to be closer to the first open end 12, and the second feed point 24 to be closer to the second open end 22A. This results in the first radiator 1 forming an electric field strength point at the first open end 12, and the second radiator 2 forming an electric field strength point at the second open end 22A. When the electronic device is in a folded state, the electric field strength points of the first radiator 1 and the second radiator 2 can couple to form a current path. This current path can cancel out another current path formed by the coupling of the grounding ends of the two radiators, thereby improving the isolation between the two radiators when operating independently. In one possible implementation, the electrical length between the first feed point 14 and the first open end 12 is less than... 1 / 8 λ, where λ is the wavelength corresponding to the first operating frequency band, and the electrical length between the second feed point 24 and the second open terminal 22A is less than λ. 1 / 8 λ, where λ is the wavelength corresponding to the second operating frequency band. Thus, the first feed point 14 can be made closer to the first open terminal 12, and the second feed point 24 can be made closer to the second open terminal 22A, which will not be elaborated further here.

[0122] In one embodiment, when the first radiator 1 and the second radiator 2 operate in the same frequency band, this frequency band can 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 frequency of the first resonance and the resonant frequency of the second resonance is less than or equal to 200 MHz. In one embodiment, the resonant frequency of the first resonance is in the range of 2.5 GHz to 2.7 GHz (cellular B41 band), and the resonant frequency of the second resonance is in the range of 2.4 GHz to 2.5 GHz (Wi-Fi 2.4G). Alternatively, the resonant point of the first resonance may be in the range of 2.4GHz to 2.5GHz (Wi-Fi 2.4G), and the resonant point of the second resonance may be in the range of 2.3GHz to 2.4GHz (cellular B40 band). Alternatively, the resonant point of the first resonance may be in the range of 1710MHz to 2170MHz (cellular B3 band), and the resonant point of the second resonance may be in the range of 1575MHz to 1630MHz (GPS).

[0123] In one embodiment, since the length of the second radiator 2 between the third open end 22B and the second open end 22A is greater than the length of the first radiator 1 between the ground end 11 and the first open end 12, the resonant frequency of the relatively longer second radiator 2 is lower than the resonant frequency of the relatively shorter first radiator 1 when no device is used to adjust the frequency. Figure 7 This is a topology diagram of an electronic device provided in the second embodiment of this application. Figure 8 for Figure 7 A partial enlarged view at the locations of the first radiator 1 and the second radiator 2, with reference 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, located between the first grounding point 21 and the second feed point 24. This second grounding point 25 serves as the grounding point on the second radiator 2. The antenna assembly 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 both, or it may include an RF switch with multiple branches, each of which may be connected to a capacitor or an inductor. The second tuning circuit 27 can adjust the efficiency dip of the second radiator 2, making the efficiency dip shallower or moving it out of band, thereby achieving higher isolation between the two radiators and enabling both radiators to obtain better antenna performance.

[0124] In one embodiment, when the electronic device is in a folded state, the projection of the ground terminal 11 is at least partially located between the projections of the first ground point 21 and the second ground point 25 along the thickness direction of the electronic device. In another embodiment, the projection of the ground terminal 11 may be completely located between the projections of the first ground point 21 and the second ground point 25 without overlapping with either projection. In yet another embodiment, at least a portion of the projection of the ground terminal 11 may overlap with the projections of the first ground point 21 and / or the second ground point 25. The ground terminal 11, the first ground point 21, and the second ground point 25 are staggered, resulting in different ground return paths for the ground terminal 11 and the first ground point 21, which helps 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 grounding terminal 11 and the second grounding point 25 different is beneficial to adjust 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 independently in the folded state of the electronic device.

[0125] In one embodiment, the electrical length of the first radiator 1 between the ground terminal 11 and the first open terminal 12 is [missing information]. 1 / 4 λ, where λ is the wavelength corresponding to the first operating frequency band. The first radiator 1 with this electrical length can achieve both better signal transmission and reception quality and a smaller structural size, which is beneficial for miniaturizing the antenna device.

[0126] In one embodiment, the electrical length of the second radiator 2 between the third open end 22B and the second open end 22A is between... 1 / 4 λ~ 1 / 2 The wavelength λ corresponds to the second operating frequency band. The second radiator 2 has a larger electrical length than the first radiator 1, which improves the isolation between the first radiator 1 and the second radiator 2 when they operate independently. It also ensures better signal transmission and reception quality for the second radiator 2 and facilitates structural miniaturization.

[0127] In one embodiment, Figure 9 This is a topology diagram of the electronic device provided in the third embodiment of this application. Figure 10 for Figure 9 A partial enlarged view at the locations of the first radiator 1 and the second radiator 2, with reference to... Figure 10 The antenna device also 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 may be coupled to a position on the first radiator 1 near the first feed point 14. In another embodiment, one end of the third tuning circuit 15 may 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 the first radiator 1 is grounded at the first feed point 14 through the third tuning circuit 15. The third tuning circuit 15 may have a similar structure to the aforementioned first tuning circuit 26; that is, the third tuning circuit 15 may also include a capacitor or an inductor, or may be composed of a combination of capacitors and inductors, or may include a radio frequency switch with multiple branches, each of which may 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. Furthermore, in some other embodiments, the third tuning circuit 15 may not be configured, and this embodiment does not limit this.

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

[0129] In one embodiment, for a cellular antenna comprising a first radiator 1 and a second radiator 2, 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 devices such as RF switches. During the adjustment process, the first resonance of the first radiator 1 can be adjusted to the corresponding first operating frequency band via the third tuning circuit 15. Then, the second tuning circuit 27 connected to the second grounding point 25 on the second radiator 2 can be adjusted. The second tuning circuit 27 can adjust the efficiency dip of the second radiator 2, making the efficiency dip shallower or moving it out of band, thus providing better isolation between the second radiator 2 and the first radiator 1. Then, the first tuning circuit 26 is adjusted so that the second resonance of the second radiator 2 is located within the corresponding second operating frequency band, which is the same as or adjacent to the first operating frequency band. This allows the first radiator 1 and the second radiator 2 to have good isolation when operating independently at the same or adjacent frequencies, resulting in excellent antenna performance.

[0130] In one embodiment, the first tuning circuit 26 may include a first inductor, and the third tuning circuit 15 may include a second inductor. Specifically, the first inductor is connected in parallel at the first feed point 14, and the second inductor is connected in parallel at the second feed point 24. The inductance value of the first inductor is smaller than that of the second inductor, which facilitates adjusting the resonant frequencies of the first radiator 1 and the second radiator 2 to the same or adjacent frequencies, enabling the first radiator 1 and the second radiator 2 to operate at the same or adjacent frequencies. In another embodiment, the third tuning circuit 15 may not be connected at the first feed point 14; that is, no tuning devices such as capacitors or inductors may be connected. Only the second inductor is connected in parallel at the second feed point 24. Through the frequency modulation effect of the second inductor, the resonant frequency of the second radiator 2 can also be adjusted to be the same as or adjacent to the resonant frequency of the first radiator 1, enabling the first radiator 1 and the second radiator 2 to operate in the same frequency band.

[0131] In one embodiment, reference is made to... Figure 10The antenna device also includes a fourth tuning circuit 28, one end of which is connected to the first ground point 21, and the other end is connected to the second ground plane 210. That is, the second radiator 2 is grounded at the first ground point 21 through the fourth tuning circuit 28. This fourth tuning circuit 28 may also include a capacitor or an inductor, or a combination of capacitors and inductors, or it may include a radio frequency switch with multiple branches, each of which can be connected to a capacitor or inductor. This fourth tuning circuit 28 helps adjust the efficiency dip of the second radiator 2, providing good isolation between the second radiator 2 and the first radiator 1. In one possible implementation, the fourth tuning circuit 28 can be used in conjunction with the second tuning circuit 27 for adjustment, which helps improve the adjustment accuracy of the efficiency dip and better matches the isolation between the first radiator 1 and the second radiator 2. Of course, as explained above, the first ground point 21 of the second radiator 2 can also be directly connected to the second ground plane 210 without connecting tuning devices such as capacitors or inductors, which will not be elaborated further here. In some other embodiments, the antenna device may further include a fifth tuning circuit (not shown in the figure), 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, both of which can be used to adjust the resonant frequency of the first radiator 1 to the corresponding first operating frequency band.

[0132] In one embodiment, Figure 11 A partial enlarged view of the electronic device provided in the fourth embodiment of this application at the positions of the first radiator 1 and the second radiator 2, with reference to... Figure 11The second radiator 2 is connected to a first tuning circuit 26 at the second feed point 24, a second tuning circuit 27 at the second ground point 25, and a fourth tuning circuit 28 at the first ground point 21. In one embodiment, both the first tuning circuit 26 and the second tuning circuit 27 may include adjustable devices such as RF switches, and the fourth tuning circuit 28 may be a capacitor. When the electronic device is in a folded state, the RF switch connected to the second open terminal 22A and the second ground 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 act as a parasitic branch 3 of the first radiator 1 to enhance the radiation performance of the first radiator 1. Specifically, for the abnormally operating second radiator 2, since the first tuning circuit 26 of the second radiator 2 is adjusted to 0 ohms, a strong current point is formed at the second open terminal 22A of the second radiator 2, and a strong electric field point is formed at the first ground point 21. For the first radiator 1 in normal operation, the first open end 12 is the point of strong electric field, and the ground end 11 is the point of strong current. Therefore, in the folded state of the electronic device, the strong electric field point of the first open end 12 of the first radiator 1 couples with the strong current point of the second open end 22A of the second radiator 2, and the strong current point of the ground end 11 of the first radiator 1 couples with the strong electric field point of the first ground end 21 of the second radiator 2. Thus, the first radiator 1 and the second radiator 2 constitute a magnetoelectric coupling mode, i.e., a magnetic parasitic mode. The second radiator 2 acts as a parasitic branch 3 of the first radiator 1, making the first radiator 1 and the second radiator 2 together form an antenna. The radiation performance of the first radiator 1 can be improved through the second radiator 2. In this embodiment, when the electronic device is used in a folded state, without using the second radiator 2 and only using the first radiator 1, the second radiator 2 can be switched to become a parasitic branch 3 of the first radiator 1 to improve the radiation performance of the first radiator 1. Therefore, even in the folded state of the electronic device, good radiation performance can be achieved solely through the first radiator 1.

[0133] Figure 12 The return loss curve of the antenna device provided in the embodiments of this application in the magneto-electric coupling mode is shown in the figure. The horizontal axis is frequency and the vertical axis is return loss. Figure 12 Two resonant points, c1 and c2, are generated in the 2GHz to 2.4GHz frequency band. c1 is the resonant point brought by the first radiator 1, and c2 is the resonant point brought by the second radiator 2.

[0134] Figure 13 The efficiency curve of the antenna device provided in the embodiments of this application in the magneto-electric coupling mode is shown in the figure. The horizontal axis represents frequency and the vertical axis represents efficiency. Figure 13Curve d1 represents the radiation efficiency of the antenna device in magnetoelectric coupling mode, and curve d2 represents the system efficiency of the antenna device in magnetoelectric coupling mode. From curve d2, it can be seen that, corresponding to... Figure 11 At the resonant points c1 and c2 shown, the system efficiency of the antenna device is above -3.6, indicating high efficiency.

[0135] In one embodiment, Figure 14 This is a topology diagram of the electronic device provided in the fifth embodiment of this application. Figure 15 for Figure 14 A partial enlarged view at the locations of the first radiator 1 and the second radiator 2, with reference to... Figure 15 The first tuning circuit 26 includes a radio frequency switch, the second tuning circuit 27 is 0 ohms, and the fourth tuning circuit 28 is 0 ohms. The second radiator 2 can be switched to passive parasitic mode, i.e., electroparasitic mode, via the radio frequency switch. The resonant point generated by the second radiator 2 can be located at a higher frequency position within the resonant frequency band of the first radiator 1, thereby improving the radiation performance of the first radiator 1. Figure 16 This is a return loss curve of the antenna device in the electronic device provided in the fifth embodiment of this application under electrical parasitic mode. The horizontal axis is frequency, and the vertical axis is return loss. Curve e1 is the return loss of the first radiator 1, and curve e2 is the return loss of the second radiator 2. (Refer to...) Figure 16 It can be seen that the resonant point generated by the second radiator 2 can be located at a higher frequency position within the resonant frequency band (2GHz~2.4GHz) of the first radiator 1, which is beneficial to improving the radiation performance of the first radiator 1.

[0136] Figure 17 This diagram compares the efficiency curves of the first radiator 1 in the antenna device provided in the fifth embodiment of this application under both the electrical parasitic mode and the coexistence mode. The horizontal axis represents frequency, and the vertical axis represents efficiency. Curve f1 represents the radiation efficiency of the first radiator 1 in the electrical parasitic mode, curve f2 represents the system efficiency of the first radiator 1 in the electrical 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 in a folded state. The first radiator 1 can generate a first resonance, and the second radiator 2 can generate a second resonance. (Refer to...) Figure 17 The radiation efficiency of the first radiator 1 in the electroparasitic mode is improved by 1.5 dB compared with the radiation efficiency in the coexistence mode, and the system efficiency is improved by 2 dB.

[0137] Figure 18This diagram compares the efficiency curves of the second radiator 2 in the antenna device provided in the fifth embodiment of this application under both the electrical parasitic mode and the coexistence mode. The horizontal axis represents frequency, and the vertical axis represents efficiency. Curve h1 represents the radiation efficiency of the second radiator 2 in the electrical parasitic mode, curve h2 represents the system efficiency of the second radiator 2 in the electrical 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 refers to the mode in which the first radiator 1 and the second radiator 2 operate independently and normally when the electronic device is in a folded state. (Refer to...) Figure 17 The radiation efficiency of the second radiator 2 in the electroparasitic mode was improved by 1.8 dB compared with that in the coexistence mode, and the system efficiency was improved by 3 dB.

[0138] In one embodiment, Figure 19 A partial enlarged view of the electronic device provided in the sixth embodiment of this application at the positions of the first radiator 1 and the second radiator 2, with reference to... Figure 19 The antenna device also includes a parasitic branch 3, which is disposed on the side of the first radiator 1 with the first open end 12 and has a first gap 31 between it and the first open end 12. The parasitic branch 3 is not disposed on the side of the second radiator 2 with the second open end 22A. Alternatively, in another embodiment, the parasitic branch 3 is disposed on the side of the second radiator 2 with the second open end 22A and has a first gap 31 between it and the second open end 22A, while the parasitic branch 3 is not disposed on the side of the first radiator 1 with 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 body 100 and second body 200. The parasitic branch 3 can attract current to create an asymmetrical current path between the two radiators, which are structurally and positionally symmetrical. This allows for the generation of destructive currents, improving the isolation between the two radiators during independent operation and extending the bandwidth. In electronic devices, the parasitic branch 3 can be part of the metal frame of the electronic device. Corresponding slits, such as the first gap 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 helps to simplify the manufacturing process and save space inside the electronic device.

[0139] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this 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 both 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 is disposed on the first body. The first radiator is provided with a grounding end and a first open end. The grounding end is coupled to the first floor. The first radiator includes a first feed point. The first feeding circuit is coupled to the first radiator through the first feeding point and is used to feed the first radiator a signal of the first operating frequency band. The first radiator is used to generate a first resonance corresponding to the first operating frequency band. A second radiator is disposed on the second body. The second radiator has 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 floor. The ratio of the length of the second radiator between the second open end and the third open end to the length of the first radiator between the grounding end and the first open end is greater than 1 and less than or equal to 2. The second radiator includes a second feed point. The second feeding circuit is coupled to the second radiator through the second feeding point and is used to feed the second radiator a signal of the second operating frequency band. The second radiator is used 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 which is coupled to the second radiator and the other end of which is coupled to the second ground, is used to adjust 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. The second radiator includes a second grounding point, which is disposed between the first grounding point and the second feed point; The antenna device further includes a second tuning circuit, one end of which is connected to the second grounding point and the other end of which is connected to the second ground plane; When the electronic device is in a folded state, along the thickness direction of the electronic device, the projection of the grounding terminal is at least partially located between the projection of the first grounding point and the projection of the second grounding point.

2. The foldable electronic device according to claim 1, characterized in that, The second tuning circuit includes a capacitor and / or an inductor and / or an RF switch for adjusting the efficiency dip of the second radiator.

3. The foldable electronic device according to claim 1 or 2, characterized in that, The grounding terminal is electrically connected to the first floor.

4. The foldable electronic device according to claim 1 or 2, characterized in that, The first radiator, the grounding terminal, and at least a portion of the first floor are integrally formed.

5. The foldable electronic device according to claim 1 or 2, characterized in that, The electrical length of the first radiator between the ground terminal and the first open terminal is 1 / 4λ, where λ is the wavelength corresponding to the first operating frequency band.

6. The foldable electronic device according to claim 1 or 2, 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.

7. The foldable electronic device according to claim 1 or 2, characterized in that, The antenna device further includes a third tuning circuit, one end of which is connected to the first radiator and the other end of which is connected to the first floor.

8. The foldable electronic device according to claim 7, characterized in that, The third tuning circuit includes a capacitor and / or an inductor and / or a radio frequency switch for adjusting the first resonance to correspond to the first operating frequency band.

9. The foldable electronic device according to claim 7, characterized in that, The first tuning circuit includes a first inductor, and the third tuning circuit includes a second inductor, wherein the inductance value of the first inductor is less than the inductance value of the second inductor.

10. The foldable electronic device according to claim 1 or 2, characterized in that, The distance between the first power supply point and the first open end is less than 7.5 mm, and the distance between the second power supply point and the second open end is less than 7.5 mm.

11. The foldable electronic device according to claim 1 or 2, characterized in that, It also includes a fourth tuning circuit, one end of which is connected to the first grounding point and the other end of which is connected to the second ground.

12. The foldable electronic device according to claim 11, characterized in that, 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.

13. The foldable electronic device according to claim 1 or 2, characterized in that, It also includes parasitic branches, which are disposed on the side of the first radiator having the first open end and have a first gap between them; or, the parasitic branches are disposed on the side of the second radiator having the second open end and have a first gap between them.

14. The foldable electronic device according to claim 1 or 2, characterized in that, The frequency of the resonant point of the first resonance is higher than the frequency of the resonant point of the second resonance.

15. The foldable electronic device according to claim 1 or 2, characterized in that, The difference between the resonant frequency of the first resonance and the resonant frequency of the second resonance is less than or equal to 200MHz.

16. The foldable electronic device according to claim 1 or 2, characterized in that, The communication frequency bands corresponding to the first and second operating frequency band signals are between 2.3 GHz and 2.7 GHz.

17. The foldable electronic device according to claim 1 or 2, characterized in that, The resonant point of the first resonance is in the range of 2.5 GHz to 2.7 GHz, and the resonant point of the second resonance is in the range of 2.4 GHz to 2.5 GHz; or, The resonant point of the first resonance is in the range of 2.4 GHz to 2.5 GHz, and the resonant point of the second resonance is in the range of 2.3 GHz to 2.4 GHz; or, The resonant point of the first resonance is in the range of 1710MHz to 2170MHz, and the resonant point of the second resonance is in the range of 1575MHz to 1630MHz.

18. The foldable electronic device according to claim 1 or 2, characterized in that, The first power supply circuit and the second power supply circuit operate simultaneously, causing the first radiator to generate the first resonance, and at the same time, the second radiator to generate the second resonance.

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