Electronic device

Abstract

Provided in the present application is an electronic device. The electronic device comprises a first antenna and a second antenna, which are arranged adjacent to each other, wherein in the first antenna, a conductive portion of a frame of a first housing is used as a first radiator, and in the second antenna, a conductive portion of a frame of a second housing is used as a second radiator; and when the electronic device is in a closed state, the first radiator and the second radiator at least partially overlap in the thickness direction of the electronic device. The first antenna and the second antenna have good isolation, such that the first antenna and the second antenna can operate at the same time to improve the communication performance of the electronic device.

Description

Electronic device

[0001] The present application claims priority from the Chinese patent application No. 202410813193.6 filed on June 21, 2024, and entitled "Electronic device", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0002] The present application relates to the field of wireless communication, and in particular to an electronic device. BACKGROUND

[0003] With the rapid development of wireless communication technology, the past second generation (2G) mobile communication system mainly supports the function of call, and the electronic device is only a tool for people to send and receive short messages and voice communication. The wireless Internet function is extremely slow because the data transmission uses voice channels for transmission. Nowadays, in addition to being used for calling, sending messages and taking pictures, electronic devices can also be used for online music listening, network video watching, real-time video, etc., covering various aspects of people's life such as calling, video entertainment and e-commerce. This has caused the number of antennas that need to be set in the electronic device to gradually increase.

[0004] For foldable electronic devices, in the closed state, the radiation environment of the antenna is limited. In the closed state, when the adjacent antennas work in adjacent communication frequency bands, the adjacent antennas will interfere with each other, resulting in poor isolation between the antennas. SUMMARY

[0005] The present application provides an electronic device, which includes a first housing and a second housing that are foldably arranged, and a first antenna and a second antenna. The first antenna has a first radiation body formed by a conductive part of a frame of the first housing. The second antenna has a second radiation body formed by a conductive part of a frame of the second housing. In the closed state of the electronic device, the first radiation body and the second radiation body at least partially overlap in the thickness direction of the electronic device.

[0006] In a first aspect, an electronic device is provided, comprising: a first housing and a second housing configured to be folded relative to each other to a closed state of the electronic device; the first housing comprising a first bezel, and the second housing comprising a second bezel; the first bezel comprising a first position, a second position and a third position arranged in sequence, the first bezel having a first insulating gap and a second insulating gap at the first position and the second position respectively, and the first bezel being coupled with a floor at the third position; the second bezel comprising a fourth position, a fifth position and a sixth position arranged in sequence, the second bezel having a third insulating gap and a fourth insulating gap at the fourth position and the fifth position respectively, and the second bezel being coupled with the floor at the fifth position; and a first antenna comprising: a first radiator comprising a conductive part of the first bezel between the first position and the third position, at least part of the first radiator being spaced apart from the floor, a first feed circuit coupled with the first radiator at a first feed point to feed a radio frequency signal of a first frequency band, and a first switch and a first switch branch coupled between the first connection point and the second connection point through the first switch; and a second antenna comprising: a second radiator comprising a conductive part of the second bezel between the fourth position and the sixth position, at least part of the second radiator being spaced apart from the floor, and the second antenna further comprising a second feed circuit coupled with the second radiator at a second feed point to feed a radio frequency signal of a second frequency band; wherein, based on the electronic device being in the closed state, the first radiator and the second radiator at least partially overlap along a first direction, the first direction being a thickness direction of the electronic device, and a distance between the first position and the fourth position is less than a distance between the first position and the sixth position, and a distance between the third position and the fourth position is greater than a distance between the third position and the sixth position; and wherein, based on the electronic device being in the closed state, the first radiator and the first switch branch are configured to generate a first resonance and a second resonance, a resonance point frequency of the first resonance being less than a resonance point frequency of the second resonance, a resonance frequency band of the second resonance comprising the first frequency band, and the second radiator is configured to generate a third resonance, a resonance frequency band of the third resonance comprising the second frequency band, and a center frequency of the second frequency band f2 satisfies: 0.85 x f1 ≤ f2 ≤ 1.15 x f1.

[0007] According to the embodiments of the present application, when the first radiator generates the first resonance and the second resonance in the closed state of the electronic device, the first resonance can be generated by the base mode of the first radiator 410, and the second resonance can be generated by the high-order mode of the first radiator 410. Since the second resonance is generated by the high-order mode, the current generated on the first radiator includes a current zero point (for example, at the resonance point of the second resonance), and the current distribution on the first radiator is similar to the current distribution generated by the line mode in the above-described embodiments. At the resonance point of the second resonance, the current coupled by the first radiator on the second radiator also includes a current zero point (including part of the reverse current in the current), and the current distribution on the second radiator is similar to the current distribution generated by the line CM mode in the above-described embodiments.

[0008] When the second radiator generates the third resonance (for example, at the resonance point of the third resonance) in the closed state of the electronic device, since the current generated on the second radiator is in the same direction and does not include a current zero point, the current distribution on the second radiator is similar to the current distribution generated by the line DM mode in the above-described embodiments. At the resonance point of the third resonance, the current coupled by the second radiator on the first radiator is mostly in the same direction, and the current distribution on the first radiator is similar to the current distribution generated by the line DM mode in the above-described embodiments.

[0009] On the first radiator, the current distribution generated by the second resonance is similar to the current distribution generated by the line CM mode, and the current distribution coupled by the second radiator is similar to the current distribution generated by the line DM mode. On the second radiator, the current distribution generated by the third resonance is similar to the current distribution generated by the line DM mode, and the current distribution coupled by the first radiator is similar to the current distribution generated by the line CM mode. Since the isolation between the line CM mode and the line DM mode is good, the interference between the current similar to the line CM mode distribution on the first radiator and the current similar to the line DM mode distribution on the second radiator is small, and the first antenna and the second antenna have good isolation.

[0010] Meanwhile, the second radiator has a structure with one end as a ground end and the other end as an open end. Moreover, the second radiator has a fourth insulating gap, which can be regarded as an equivalent capacitor (for example, a distributed capacitor) provided on the second radiator, and the equivalent capacitor can make the second radiator form a metamaterial structure. The second radiator with the metamaterial structure can increase the radiation aperture, and the electric field is more dispersed after the fourth insulating gap. In an embodiment, the dielectric loss near the second radiator forming the metamaterial structure is reduced, and thus the radiation characteristics (for example, system efficiency and radiation efficiency) of the second antenna can be effectively improved.

[0011] With reference to the first aspect, in some implementations of the first aspect, at a resonance point of the second resonance, the current on the first radiator includes a current zero point; at a resonance point of the third resonance, the current on the second radiator is in the same direction.

[0012] With reference to the first aspect, in some implementations of the first aspect, based on the electronic device being in the closed state, a ratio between a length L' of an overlapping portion of the first radiator on the second bezel and a length L2 of the second radiator satisfies: (L' / L2) >= 0.5.

[0013] According to embodiments of the present application, since the first radiator and the second radiator at least partially overlap in the first direction, the first antenna and the second antenna have strong coupling therebetween.

[0014] With reference to the first aspect, in some implementations of the first aspect, at a resonance point of the second resonance, the current on the second radiator includes a current zero point.

[0015] With reference to the first aspect, in some implementations of the first aspect, the first switch branch includes a 0 ohm resistor, or an equivalent inductance value of the first switch branch is less than or equal to 2nH.

[0016] According to embodiments of the present application, the first switch branch is coupled and connected between the first connection point and the second connection point through the first switch, the first switch branch can make the first connection point and the second connection point approximately short-circuit, and the first radiator does not form a metamaterial structure, so that the current generated by the first radiator at the second resonance includes a current zero point.

[0017] With reference to the first aspect, in some implementations of the first aspect, the first antenna further includes a second switch branch, the second switch branch being coupled and connected between the first connection point and the second connection point through the first switch.

[0018] With reference to the first aspect, in some implementations of the first aspect, the first radiator and the second switch branch are configured to generate a fourth resonance, a resonance frequency band of the fourth resonance including a third frequency band, the third frequency band being different from the first frequency band and the second frequency band.

[0019] With reference to the first aspect, in some implementations of the first aspect, at a resonance point of the fourth resonance, the current on the first radiator is in the same direction.

[0020] According to embodiments of the present application, the first radiator and the second switch branch are configured to generate a fourth resonance. The fourth resonance has a resonance frequency band including the third frequency band. In one embodiment, the third frequency band and the second frequency band are not adjacent (a frequency difference between a center frequency of the third frequency band and a center frequency of the second frequency band is greater than 100 MHz).

[0021] The second switch branch is coupled between the first connection point and the second connection point through the first switch. The first connection point and the second connection point are not equivalent to a short circuit. The second insulating gap of the first radiator can be regarded as an equivalent capacitor (e.g., a distributed capacitor) provided on the first radiator, which can make the first radiator form a metamaterial structure. The first radiator with the metamaterial structure can increase the radiation aperture, and the electric field is more dispersed after the second insulating gap. In one embodiment, the dielectric loss near the first radiator forming the metamaterial structure is reduced, and thus the radiation characteristics (e.g., system efficiency and radiation efficiency) of the first antenna can be effectively improved.

[0022] The second switch branch is coupled between the first connection point and the second connection point through the first switch. The second switch branch can be used to adjust the equivalent capacitance value of the second insulating gap, so as to adjust the radiation characteristics (e.g., the resonance point frequency of the fourth resonance generated by the first radiator) of the first antenna.

[0023] With reference to the first aspect, in some implementations of the first aspect, a distance between the first connection point and / or the second connection point and the second insulating gap is less than or equal to 5 mm.

[0024] With reference to the first aspect, in some implementations of the first aspect, the second radiator includes a third connection point and a fourth connection point, and the fourth insulating gap is located between the third connection point and the fourth connection point. The second antenna further includes a second switch and a third switch branch. The third switch branch is coupled between the third connection point and the fourth connection point through the second switch, or the third switch branch is coupled between the third connection point and the ground plane through the second switch.

[0025] According to embodiments of the present application, the third switch branch coupled between the third connection point and the fourth connection point (or between the third connection point or the fourth connection point and the ground plane) can adjust the equivalent capacitance value of the fourth insulating gap, so as to adjust the radiation characteristics (e.g., the resonance point frequency of the third resonance generated by the second radiator) of the second antenna.

[0026] With reference to the first aspect, in some implementations of the first aspect, the second radiator and the third switch branch are configured to generate the third resonance.

[0027] With reference to the first aspect, in some embodiments of the first aspect, a distance between the third connection point and / or the fourth connection point and the fourth insulating gap is less than or equal to 5 mm.

[0028] With reference to the first aspect, in some embodiments of the first aspect, the first connection point is located between the first position and the second position, and the second connection point is located between the second position and the third position; the first radiator includes a fifth connection point located between the second connection point and the third position; and the first antenna further includes a third switch and a fourth switch branch, the fourth switch branch being coupled between the fifth connection point and the ground plane through the third switch.

[0029] According to embodiments of the present application, the fourth switch branch is coupled with the fifth connection point through the third switch, and part of the current on the first radiator is transmitted to the ground plane through the fifth switch branch, and the intensity of the current on the first radiator between the fifth connection point and the third position is reduced.

[0030] When the first radiator generates the second resonance (for example, at a resonance point of the second resonance), due to the reduction of the intensity of the current on the first radiator between the fifth connection point and the third position, a reverse current appears in the current on the second radiator generated by the coupling of the first radiator, so that the current distribution on the second radiator generated by the coupling of the first radiator is similar to the current distribution generated by the linear mode.

[0031] On the second radiator, the current distribution generated by the third resonance is similar to the current distribution generated by the linear DM mode, and the current distribution generated by the coupling of the first radiator is similar to the current distribution generated by the linear CM mode. Since the isolation between the linear CM mode and the linear DM mode is good, the interference between the current distributed similarly to the linear CM mode and the current distributed similarly to the linear DM mode on the first radiator and the second radiator is small, and the first antenna and the second antenna have good isolation.

[0032] With reference to the first aspect, in some embodiments of the first aspect, the first frame further includes a seventh position, and the first position is located between the seventh position and the second position; the first antenna includes a parasitic branch, the parasitic branch including a conductive part of the first frame between the first position and the seventh position, and at least part of the parasitic branch is arranged to be spaced apart from the ground plane; and the parasitic branch can be used to generate a parasitic resonance, and a resonance point frequency of the parasitic resonance is higher than a resonance point frequency of the second resonance.

[0033] According to embodiments of the present application, the parasitic branch can be used to generate a parasitic resonance to improve the radiation characteristics (for example, the operating bandwidth) of the first antenna.

[0034] With reference to the first aspect, in some implementations of the first aspect, the parasitic branch includes a sixth connection point; and the first antenna further includes a fourth switch and a fifth switch branch, the fifth switch branch being coupled between the sixth connection point and the ground plane through the fourth switch.

[0035] According to embodiments of the present application, the fifth switch branch can be used to adjust the current distribution on the parasitic branch.

[0036] Meanwhile, when the second radiator generates the third resonance (for example, at the resonance point of the third resonance), the parasitic branch also generates a current due to coupling, which can weaken the intensity of the current on the first radiator due to coupling, further reduce the coupling between the first radiator and the second radiator, and improve the isolation between the first antenna and the second antenna.

[0037] With reference to the first aspect, in some implementations of the first aspect, at the resonance point of the second resonance, the currents on the first radiator on both sides of the first insulating gap and the current on the parasitic branch are opposite; and at the resonance point of the third resonance, the currents on the first radiator on both sides of the first insulating gap due to coupling of the second radiator and the current on the parasitic branch due to coupling of the second radiator are in the same direction.

[0038] According to embodiments of the present application, when the first radiator generates the second resonance (for example, at the resonance point of the second resonance), the currents on the first radiator on both sides of the first insulating gap (first position) and the current on the parasitic branch are opposite. When the second radiator generates the third resonance (for example, at the resonance point of the third resonance), the currents on the first radiator on both sides of the first insulating gap (first position) due to coupling of the second radiator and the current on the parasitic branch 430 due to coupling of the second radiator 420 are in the same direction.

[0039] When the first antenna includes the parasitic branch, when the first radiator generates the second resonance and the second radiator generates the third resonance on both sides of the first insulating gap (first position), the current distribution is similar to the line CM mode and the line DM mode in the above embodiments, respectively. Therefore, the first antenna and the second antenna have better isolation.

[0040] With reference to the first aspect, in some implementations of the first aspect, the first insulating gap and the third insulating gap are aligned, and / or the second insulating gap and the fourth insulating gap are aligned.

[0041] According to embodiments of the present application, the first insulating gap and the third insulating gap are aligned, and / or the second insulating gap and the fourth insulating gap are aligned, to improve the appearance of the electronic device.

[0042] With reference to the first aspect, in some implementations of the first aspect, based on that the electronic device is in the closed state, a ratio between a length L’ of the overlapping part of the projection of the first radiator on the second bezel and a length L1 of the first radiator satisfies: (L’ / L2) = 1.

[0043] According to embodiments of the present application, the length of the first radiator can be the same as the length of the second radiator, or the length of the first radiator can be smaller than the length of the second radiator.

[0044] With reference to the first aspect, in some implementations of the first aspect, the electronic device further includes a third housing, a first rotating shaft and a second rotating shaft; the first rotating shaft is located between the first housing and the second housing, and the first rotating shaft is rotationally connected with the first housing and the second housing respectively; the second rotating shaft is located between the third housing and the second housing, and the second rotating shaft is rotationally connected with the third housing and the second housing respectively.

[0045] According to embodiments of the present application, the electronic device can include multiple housings, and the multiple housings are rotationally connected. BRIEF DESCRIPTION OF DRAWINGS

[0046] FIG. 1 is a schematic diagram of an electronic device 100 according to an embodiment of the present application.

[0047] FIG. 2 is a schematic structural diagram of the foldable electronic device 100 according to an embodiment of the present application.

[0048] FIG. 3 is a schematic structural diagram of the foldable electronic device 100 in an outer folding state.

[0049] FIG. 4 is a schematic structural diagram of the foldable electronic device 100 in a possible unfolded state.

[0050] FIG. 5 is a schematic structural diagram of the foldable electronic device 100 in a possible closed state.

[0051] FIG. 6 is a schematic structural diagram of the foldable electronic device 100 in a possible partially unfolded state.

[0052] FIG. 7 is a schematic diagram of a structure of a common mode of an antenna and a corresponding distribution of current and electric field.

[0053] FIG. 8 is a schematic diagram of a structure of a differential mode of another antenna and a corresponding distribution of current and electric field.

[0054] FIG. 9 is a schematic diagram of an electronic device 100 according to an embodiment of the present application.

[0055] FIG. 10 is a schematic diagram of an electronic device 100 according to an embodiment of the present application.

[0056] FIG. 11 is a schematic diagram of an electronic device 100 according to an embodiment of the present application.

[0057] FIG. 12 is a schematic diagram of an electronic device 100 according to an embodiment of the present application.

[0058] FIG. 13 is a schematic diagram of an electronic device 100 according to an embodiment of the present application.

[0059] FIG. 14 is a simulation result of S parameters of the first antenna and the second antenna in the electronic device 100 shown in FIG. 13.

[0060] FIG. 15 is a schematic diagram of another electronic device 100 according to an embodiment of the present application.

[0061] FIG. 16 is a schematic diagram of another electronic device 100 according to an embodiment of the present application.

[0062] FIG. 17 is a simulation result of S parameters of the first antenna and the second antenna in the electronic device 100 shown in FIG. 16.

[0063] FIG. 18 is a schematic diagram of current distribution when the first antenna resonates in the electronic device 100 shown in FIG. 16.

[0064] FIG. 19 is a schematic diagram of current distribution when the second antenna resonates in the electronic device 100 shown in FIG. 16. DETAILED DESCRIPTION

[0065] Hereinafter, the terms that can appear in the embodiments of the present application are explained.

[0066] It should be understood that the term "and / or" used herein is only to describe the same field of the associated objects, which means that there can be three relationships, for example, A and / or B can represent the following three cases: A exists alone, A and B exist together, and B exists alone. In addition, the character " / " used herein generally represents an "or" relationship between the front and rear associated objects.

[0067] The "in the range" used in the present application, unless otherwise indicated, includes the two end values of the range by default, for example, in the range of 1 to 5, including the two values of 1 and 5.

[0068] Coupling: can be understood as direct coupling and / or indirect coupling, and "coupling connection" can be understood as direct coupling connection and / or indirect coupling connection. Direct coupling can also be referred to as "electrical connection", which means that the components are in physical contact and electrically conductive; it can also be understood as a form of connection between different components in the circuit structure through the entity line of the printed circuit board (PCB) copper foil or wire that can transmit electrical signals; "indirect coupling" can be understood as electrical conduction between two conductors through space / non-contact. In an embodiment, indirect coupling can also be referred to as capacitive coupling, for example, through the coupling between the gap between the two conductive parts to form an equivalent capacitor to achieve signal transmission.

[0069] Element / device: includes at least one of lumped element / device and distributed element / device.

[0070] Lumped element / device: refers to a general term for all elements when the size of the element is much smaller than the relative wavelength of the circuit operating frequency. For a signal, at any time, the characteristics of the element remain fixed and are independent of the frequency.

[0071] Distributed element / device: unlike lumped elements, when the size of the element is similar to or larger than the relative wavelength of the circuit operating frequency, the characteristics of each point of the element itself will be different due to the change of the signal when the signal passes through the element, and at this time the element as a whole cannot be regarded as a single body with fixed characteristics, but should be called a distributed element.

[0072] Capacitance: can be understood as lumped capacitance and / or distributed capacitance. Lumped capacitance refers to a component that exhibits capacitance, such as a capacitor element; distributed capacitance (or distributed capacitance) refers to an equivalent capacitor formed by spacing a certain gap between two conductive parts.

[0073] Inductance: can be understood as lumped inductance and / or distributed inductance. Lumped inductance refers to a component that exhibits inductance, such as an inductor element; distributed inductance (or distributed inductance) refers to an equivalent inductance formed by a certain length of conductive part.

[0074] Radiating body: is a device used to receive / send electromagnetic wave radiation in an antenna. In some cases, "antenna" is understood in a narrow sense as a radiating body, which changes the waveguide energy from the transmitter into radio waves, or converts radio waves into waveguide energy for radiation and reception of radio waves. The modulated high-frequency current energy (or waveguide energy) generated by the transmitter is transmitted to the transmitting radiating body through the feed line, and is converted into electromagnetic wave energy of a certain polarization by the radiating body and radiated in the desired direction. The receiving radiating body converts the electromagnetic wave energy of a certain polarization from a certain direction in space into modulated high-frequency current energy, which is delivered to the input end of the receiver through the feed line.

[0075] The radiator can include a conductor with a specific shape and size, such as a line shape, or a patch shape, etc. The application does not limit the specific shape. In an embodiment, the line shape radiator can be referred to as a line antenna. In an embodiment, the line shape radiator can be implemented by a conductive frame, which can also be referred to as a frame antenna. In an embodiment, the line shape radiator can be implemented by a support conductor, which can also be referred to as a support antenna. In an embodiment, the line diameter (e.g., including thickness and width) of the line shape radiator, or the radiator of the line antenna, is much smaller (e.g., less than 1 / 16 of the wavelength) than the wavelength (e.g., the medium wavelength), and the length can be comparable to the wavelength (e.g., the medium wavelength) (e.g., the length is around 1 / 8 of the wavelength, or 1 / 8 to 1 / 4, or 1 / 4 to 1 / 2, or longer). The main forms of the line antenna include a dipole antenna, a half-wave vibrator antenna, a monopole antenna, a loop antenna, and an inverted F antenna (also referred to as IFA). For example, for a dipole antenna, each dipole antenna generally includes two radiating branches, and each branch is fed by a feed from the feed end of the radiating branch. For example, the inverted F antenna (IFA) can be regarded as being obtained by adding a ground path to a monopole antenna. The IFA antenna has a feed point and a ground point, and is called an inverted F antenna because its side view is in the shape of an inverted F. In an embodiment, the patch shape radiator can include a microstrip antenna, or a patch antenna, such as a planar inverted F antenna (also referred to as PIFA). In an embodiment, the patch shape radiator can be implemented by a planar conductor (e.g., a conductive sheet or a conductive coating, etc.). In an embodiment, the patch shape radiator can include a conductive sheet, such as a copper sheet, etc. In an embodiment, the patch shape radiator can include a conductive coating, such as silver paste, etc. The shape of the patch shape radiator includes a circular shape, a rectangular shape, a loop shape, etc. The structure of the microstrip antenna is generally composed of a dielectric substrate, a radiator, and a ground plate, wherein the dielectric substrate is arranged between the radiator and the ground plate.

[0076] The radiators can also include slots or gaps formed on the conductors, such as closed or semi-closed slots or gaps formed on the ground conductor plane. In one embodiment, the radiators with slots or gaps can be referred to as slot antennas or gap antennas. In one embodiment, the slots or gaps of the slot / gap antennas have a radial dimension (e.g., including width) much smaller than the wavelength (e.g., dielectric wavelength) (e.g., less than 1 / 16 of the wavelength), and a length dimension comparable to the wavelength (e.g., dielectric wavelength) (e.g., around 1 / 8 of the wavelength, or 1 / 8 to 1 / 4, or 1 / 4 to 1 / 2, or longer). In one embodiment, the radiators with closed slots or gaps can be referred to as closed slot antennas. In one embodiment, the radiators with semi-closed slots or gaps (e.g., with openings added to the closed slots or gaps) can be referred to as open slot antennas. In some embodiments, the gap shape is long and thin. In some embodiments, the length of the gap is about half of the wavelength (e.g., dielectric wavelength). In some embodiments, the length of the gap is about an integer multiple of the wavelength (e.g., one dielectric wavelength). In some embodiments, the gap can be fed by a transmission line that is connected across one or both sides of the gap, whereby the gap is excited with a radio frequency electromagnetic field and radiates electromagnetic waves into space. In one embodiment, the radiators of the slot or gap antennas can be implemented by a conductive frame that is grounded at both ends, which can also be referred to as a frame antenna. In this embodiment, the slot or gap antenna can be considered to include a linear radiator that is spaced apart from the ground plane and grounded at both ends, thereby forming a closed or semi-closed slot or gap. In one embodiment, the radiators of the slot or gap antennas can be implemented by a bracket conductor that is grounded at both ends, which can also be referred to as a bracket antenna.

[0077] The feed circuit is a combination of all circuits for reception and transmission of radio frequency signals. The feed circuit can include a transceiver and a radio frequency front end circuit. In some cases, the term "feed circuit" is used in a narrow sense to refer to a radio frequency integrated circuit (RFIC), which can be considered to include a radio frequency front end chip and a transceiver. The feed circuit has the function of converting radio waves (e.g., radio frequency signals) and electrical signals (e.g., digital signals). In general, it is considered to be part of the radio frequency.

[0078] In some embodiments, the electronic device can also include a test seat (or referred to as a radio frequency seat or a radio frequency test seat). The test seat can be used to insert a coaxial cable to test the characteristics of the radio frequency front end circuit or the radiators of the antenna through the cable. The radio frequency front end circuit can be considered to be a circuit portion coupled between the test seat and the transceiver.

[0079] In some embodiments, the radio frequency front-end circuit can be integrated as a radio frequency front-end chip in the electronic device, or the radio frequency front-end circuit and the transceiver can be integrated as a radio frequency chip in the electronic device.

[0080] It should be understood that any two of the first / second / … / Nth feeding circuits in the present application can share the same transceiver, for example, through one radio frequency channel in one transceiver (for example, one port (pin) of a radio frequency chip transmits signals; and can also share one radio frequency front-end circuit, for example, through a tuning circuit or an amplifier in one radio frequency front-end to process signals.

[0081] It should also be understood that two of the first / second / … / Nth feeding circuits in the present application generally correspond to two radio frequency test seats in the electronic device.

[0082] The matching circuit is a circuit for adjusting the radiation characteristics of the antenna. In one embodiment, the matching circuit is coupled between the feeding circuit and the corresponding radiator. In one embodiment, the matching circuit is coupled between the test seat and the radiator. Generally, the matching circuit is a combination of circuits coupled between the radiator and the ground plane. In one embodiment, the matching circuit can include tuning circuits and / or elements, and the tuning circuit can be an element for switching the coupling connection of the radiator. The matching circuit has the functions of impedance matching and / or frequency tuning. Generally, it is considered as a part of the antenna.

[0083] The ground structure / feeding structure can include connectors, such as metal springs, and the radiator is coupled to the ground plane through the ground structure / the feeding structure is coupled to the feeding circuit. In some embodiments, the feeding structure can include a transmission line / feeding line, and the ground structure can include a ground line.

[0084] End / point: the "end / point" of the first end / second end / feed end / ground end / feed point / ground point / connection point of the antenna radiator, which cannot be understood as the end point or end part that is physically disconnected from other radiators in a narrow sense, but can also be considered as a certain point or a certain section on the continuous radiator. In an embodiment, the "end / point" can include a connection / coupling area on the antenna radiator that is coupled to other conductive structures, for example, the feed end / feed point can be a coupling area (for example, an area that faces a part of the feed circuit) on the antenna radiator that is coupled to a feed structure or a feed circuit, and for another example, the ground end / ground point can be a connection / coupling area on the antenna radiator that is coupled to a ground structure or a ground circuit. Open end / closed end: in some embodiments, the open end and the closed end are, for example, relative to whether it is grounded, the closed end is grounded, and the open end is not grounded. In some embodiments, the open end and the closed end are, for example, relative to other conductive bodies, the closed end is electrically connected to other conductive bodies, and the open end is not electrically connected to other conductive bodies. In an embodiment, the open end can also be referred to as a suspended end, a free end, an open end, or an open circuit end. In an embodiment, the closed end can also be referred to as a grounded end or a short circuit end. It should be understood that in some embodiments, other conductive bodies can be coupled to the open end to transfer coupled energy (which can be understood as transferring current).

[0085] In some embodiments, the understanding of the "closed end" can also be from the perspective of current distribution, and the closed end or the grounded end, etc. can be understood as a current large point on the radiator, or as a small point of the electric field on the radiator; in an embodiment, coupling electronic devices (such as capacitors, inductors, etc.) at the closed end can not change the current distribution characteristics of the current large point / small point of the electric field; in an embodiment, opening a slit (for example, a gap filled with insulating material) at or near the closed end can not change the current distribution characteristics of the current large point / small point of the electric field.

[0086] In some embodiments, the understanding of the "open end" can also be from the perspective of current distribution, and the open end or the suspended end, etc. can be understood as a current small point on the radiator, or as a large point of the electric field on the radiator; in an embodiment, coupling electronic devices (such as capacitors, inductors, etc.) at the open end can not change the current distribution characteristics of the current small point / large point of the electric field.

[0087] It should be understood that coupling electronic devices (such as capacitors, inductors, etc.) at the radiator end at a gap (similar to the radiator at the opening of the open end or the suspended end from the structure of the radiator) can make the radiator end a current large point / small point of the electric field, and in this case, it should be understood that the radiator end at the gap is actually a closed end or a grounded end, etc.

[0088] The "suspended radiator" mentioned in the embodiments of the present application refers to a radiator that is not directly connected to a feeding line / branch and / or a grounding line / branch, but is fed and / or grounded through indirect coupling.

[0089] It should be understood that the "suspended" in the "suspended end" and the "suspended radiator" does not mean that there is no structure around the radiator to support it. In an embodiment, the suspended radiator may, for example, be a radiator arranged on the inner surface of an insulating back cover.

[0090] The "same direction" and "opposite direction" of the current mentioned in the embodiments of the present application should be understood as the direction of the main current on the same side of the conductor. For example, when the same direction distribution current (for example, the current path is also bent or ring-shaped) is excited on the conductor in the bent shape or ring shape, it should be understood that, for example, the main current excited on the conductors on both sides of the ring-shaped conductor (for example, the conductors around a gap, on both sides of the gap) is opposite in direction, but still belongs to the definition of the same direction distribution current in the embodiments of the present application. In an embodiment, the same direction of the current on a conductor can mean that the current on the conductor has no reversal point. In an embodiment, the opposite direction of the current on a conductor can mean that the current on the conductor has at least one reversal point. In an embodiment, the same direction of the current on two conductors can mean that the currents on the two conductors have no reversal point and flow in the same direction. In an embodiment, the opposite direction of the current on two conductors can mean that the currents on the two conductors have no reversal point and flow in opposite directions. The same direction and opposite direction of the current on multiple conductors can be understood accordingly.

[0091] Resonance / resonance frequency: resonance frequency is also called resonance frequency. Resonance frequency can have a frequency range, that is, a resonance frequency range. The frequency corresponding to the strongest resonance point is the center frequency point frequency. The return loss characteristic of the center frequency can be less than -20 dB. It should be understood that, unless otherwise specified, the "first / second... resonance" mentioned in the present application refers to the base mode resonance generated by the antenna / radiator, or in other words, the resonance with the lowest frequency generated by the antenna / radiator. It should be understood that the antenna / radiator can generate one or more antenna modes according to the specific design, and each antenna mode can correspond to a base mode resonance.

[0092] Resonance frequency band: the range of resonance frequencies is the resonance frequency band, and the return loss characteristic of any frequency point in the resonance frequency band can be less than -6 dB or -5 dB.

[0093] Communication band / operating band: Regardless of the type of antenna, it always works within a certain frequency range (bandwidth). For example, an antenna supporting B40 band has an operating band including frequencies within the range of 2300MHz-2400MHz, or in other words, the operating band of the antenna includes the B40 band. The frequency range that meets the index requirements can be regarded as the operating band of the antenna.

[0094] 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 an antenna can cover one or more operating frequency bands of the antenna.

[0095] Electrical length: can refer to the ratio of the physical length (i.e. mechanical length or geometric length) to the wavelength of the transmitted electromagnetic wave, which can satisfy the following formula:

[0096] Where L is the physical length and λ is the wavelength of the electromagnetic wave.

[0097] 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 that the center frequency of the B1 uplink band (resonant frequency of 1920MHz-1980MHz) is 1955MHz, the operating wavelength can be the wavelength calculated using the frequency of 1955MHz. Not limited to the center frequency, the "operating wavelength" can also refer to the wavelength corresponding to a non-center frequency of the resonant frequency or the operating frequency band.

[0098] It should be understood that the wavelength of the 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 3x10 8 m / s. The wavelength of the radiation signal in a medium can be calculated as follows: medium Where ε is the relative permittivity of the medium. The wavelength in the embodiments of the present application generally refers to the medium wavelength, which can be the medium wavelength corresponding to the center frequency of the resonant frequency or the center frequency of the operating frequency band supported by the antenna. For example, assuming that the center frequency of the B1 uplink band (resonant frequency of 1920MHz-1980MHz) is 1955MHz, the wavelength can be the medium wavelength calculated using the frequency of 1955MHz. Not limited to the center frequency, the "medium wavelength" can also refer to the medium wavelength corresponding to a non-center frequency of the resonant frequency or the operating frequency band. For ease of understanding, the medium wavelength mentioned in the embodiments of the present application can be simply calculated by the relative permittivity of the medium filled on one side or more sides of the radiator.

[0099] Total efficiency of antenna system: refers to the ratio of input power to output power at the port of the antenna.

[0100] Radiation efficiency of antenna: refers to the ratio of the power radiated by the antenna to space (i.e. the power of the part effectively converted into electromagnetic waves) to the active power input to the antenna. The active power input to the antenna = input power of the antenna - loss power; the loss power mainly includes the return loss power and the ohmic loss power of the metal and / or the dielectric loss power. The radiation efficiency is a value for measuring the radiation capability of the antenna, and the metal loss and the dielectric loss are both factors affecting the radiation efficiency.

[0101] As can be understood by those skilled in the art, efficiency is generally expressed in percentage, and there is a corresponding conversion relationship between efficiency and dB. The closer the efficiency is to 0dB, the better the efficiency of the antenna is.

[0102] Antenna return loss: can be understood as the ratio of the signal power reflected back to the antenna port to the antenna port transmission power through the antenna circuit. The smaller the reflected signal, the greater the signal radiated by the antenna to space, and the greater the radiation efficiency of the antenna. The greater the reflected signal, the smaller the signal radiated by the antenna to space, and the smaller the radiation efficiency of the antenna.

[0103] The antenna return loss can be represented by the S11 parameter, which belongs to the S parameters. S11 represents the reflection coefficient, and this parameter can represent the pros and cons of the antenna transmission efficiency. The S11 parameter is usually negative, and the smaller the S11 parameter, the smaller the antenna return loss, and the smaller the energy reflected back by the antenna itself, which means that the actual energy entering the antenna is more, and the system efficiency of the antenna is higher; the larger the S11 parameter, the larger the antenna return loss, and the lower the system efficiency of the antenna.

[0104] It should be noted that the S11 value is generally-6dB as a standard in engineering. When the S11 value of the antenna is less than-6dB, it can be considered that the antenna can work normally, or it can be considered that the transmission efficiency of the antenna is better.

[0105] Ground (GND): can refer to at least one part of any ground layer, or ground plate, or ground metal layer, etc. in an electronic device (such as a mobile phone), or at least one part of any combination of the above ground layer, or ground plate, or ground component, etc. Ground can be used for the grounding of components in an electronic device. In an embodiment, ground can be a ground layer of a circuit board of an electronic device, or a ground plate formed by a middle frame of an electronic device, or a ground metal layer formed by a metal film under a screen of an electronic device. In an embodiment, the circuit board can be a printed circuit board (PCB), for example, an 8-layer, 10-layer, or 12-14 layer board with 8, 10, 12, 13, or 14 layers of conductive material, or elements separated and electrically insulated by a dielectric layer or an insulating layer such as glass fiber, polymer, etc. In an embodiment, the circuit board includes a dielectric substrate, a ground layer, and a wiring layer, and the wiring layer and the ground layer are electrically connected by a via. In an embodiment, components such as a display, a touch screen, an input button, a transmitter, a processor, a memory, a battery, a charging circuit, a system on chip (SoC) structure, etc. can be mounted on or connected to the circuit board; or electrically connected to the wiring layer and / or the ground layer in the circuit board. For example, a radio frequency source is arranged on the wiring layer.

[0106] Any ground layer, or ground plate, or ground metal layer described above is made of conductive material. In an embodiment, the conductive material can be any one of the following materials: copper, aluminum, stainless steel, brass and their alloys, copper foil on an insulating substrate, aluminum foil on an insulating substrate, gold foil on an insulating substrate, silver-plated copper, silver-plated copper foil on an insulating substrate, silver foil on an insulating substrate, and tin-plated copper, graphite powder impregnated cloth, graphite coated substrate, copper plated substrate, brass plated substrate, and aluminum plated substrate. Those skilled in the art can understand that the ground layer / ground plate / ground metal layer can also be made of other conductive materials.

[0107] Grounding: refers to coupling with the above ground / ground plate in any way. In an embodiment, grounding can be physical grounding, for example, physical grounding (or called physical ground) at a specific position on the frame through a part of the frame structure. In an embodiment, grounding can be device grounding, for example, device grounding (or called device ground) through capacitors, inductors, resistors, etc. in series or parallel.

[0108] The technical solutions of the embodiments of the present application will be described below with reference to the drawings.

[0109] As shown in FIG. 1, the electronic device 100 can include a cover 13, a display module 15, a printed circuit board (PCB) 17, a middle frame 19, and a rear cover 21. It should be understood that in some embodiments, the cover 13 can be a cover glass, and can also be replaced by a cover of other materials, such as a PET (Polyethylene terephthalate) material cover, etc.

[0110] The cover 13 can be arranged close to the display module 15, and can be mainly used for protecting and dustproofing the display module 15.

[0111] In an embodiment, the display module 15 can include a liquid crystal display (LCD), a light emitting diode (LED) display panel, or an organic light-emitting diode (OLED) display panel, etc., and the embodiments of the present application do not limit this.

[0112] The middle frame 19 mainly plays a supporting role for the whole machine. In FIG. 1, the PCB 17 is arranged between the middle frame 19 and the rear cover 21, and it should be understood that in an embodiment, the PCB 17 can also be arranged between the middle frame 19 and the display module 15, and the embodiments of the present application do not limit this. The printed circuit board PCB 17 can use a flame-retardant material (FR-4) dielectric board, a Rogers dielectric board, a hybrid dielectric board of Rogers and FR-4, etc. Here, FR-4 is a code of a flame-retardant material grade, and the Rogers dielectric board is a high-frequency board. The PCB 17 carries elements such as radio frequency chips. In an embodiment, a metal layer can be arranged on the printed circuit board PCB 17. The metal layer can be used for grounding of the elements carried on the printed circuit board PCB 17, and can also be used for grounding of other elements such as a bracket antenna and a frame antenna, and the metal layer can be referred to as a ground plate, or a grounding plate, or a grounding layer. In an embodiment, the metal layer can be formed by etching metal on the surface of any one of the dielectric boards in the PCB 17. In an embodiment, the metal layer for grounding can be arranged on one side of the printed circuit board PCB 17 close to the middle frame 19. In an embodiment, the edge of the printed circuit board PCB 17 can be regarded as the edge of its grounding layer. In an embodiment, the metal middle frame 19 can also be used for grounding of the above-mentioned elements. The electronic device 100 can also have other ground plates / grounding plates / grounding layers, as described above, which will not be repeated here.

[0113] Due to the compactness inside the electronic device, a floor / ground plane (e.g., printed circuit board, middle frame, screen metal layer, battery, etc. can be considered as part of the floor) is usually arranged in the internal space of 0-2mm from the inner surface of the frame. In an embodiment, the filling medium between the frame and the floor can be simply profiled with the inner surface of the filling medium, and the length and width of the rectangle formed by the surrounding can be considered as the length and width of the floor; or all the conductive parts inside the frame can be superimposed to form a profile, and the length and width of the rectangle formed by the surrounding can be considered as the length and width of the floor.

[0114] The electronic device 100 can further include a battery (not shown in the figure). The battery can be arranged between the middle frame 19 and the back cover 21, or can be arranged between the middle frame 19 and the display module 15, and the embodiments of the present application do not limit this. In some embodiments, the PCB 17 is divided into a main board and a sub-board, and the battery can be arranged between the main board and the sub-board, wherein the main board can be arranged between the upper edge of the middle frame 19 and the battery, and the sub-board can be arranged between the lower edge of the middle frame 19 and the battery.

[0115] The electronic device 100 can further include a frame 11, which can include a conductive material such as metal. The frame 11 can be arranged between the display module 15 and the back cover 21 and extend circumferentially around the periphery of the electronic device 100. The frame 11 can have four side edges surrounding the display module 15, helping to fix the display module 15.

[0116] In an implementation manner, the frame 11 mainly including a conductive material can be referred to as a conductive frame or a metal frame of the electronic device 100, which is suitable for an industrial design (ID) of a metal appearance. In an implementation manner, the outer surface of the frame 11 is mainly a conductive material, such as a metal material, so as to form an appearance of a metal frame. In these implementation manners, the conductive part including the outer surface in the frame 11 can be used as an antenna radiator of the electronic device 100, and is usually referred to as a frame antenna.

[0117] In another implementation, the outer surface of the bezel 11 is mainly a non-conductive material, such as plastic, forming a non-metallic appearance of the bezel, suitable for a non-metallic ID. In one implementation, the inner surface of the bezel 11 can include a conductive material, such as a metallic material. In this implementation, the conductive portion of the inner surface of the bezel 11 can be used as an antenna radiator of the electronic device 100. It should be understood that the radiator provided on the inner surface of the bezel 11 (or the conductive material of the inner surface) can be provided against the non-conductive material of the bezel 11 to minimize the volume occupied by the radiator and be closer to the outside of the electronic device 100 to achieve better signal transmission effect, and can also be referred to as a bezel antenna. It should be noted that the radiator provided against the non-conductive material of the bezel 11 means that the radiator can be provided against the inner surface of the non-conductive material, or can be embedded in the non-conductive material, or can be provided close to the inner surface of the non-conductive material, for example, the radiator and the inner surface of the non-conductive material can have a small gap therebetween. It should be understood that the conductive material and the non-conductive material can be regarded as part of the bezel 11.

[0118] It should be understood that the bezel 11 can have insulating gaps, and the conductive portions of the bezel between the insulating gaps and / or between the insulating gaps and the grounding point can be used as radiators to form a bezel antenna (it should be understood that the radiators of the bezel antenna can also include the grounding point and the conductive portions of the bezel between the grounding points). When the bezel 11 is formed of a conductive material such as metal, the insulating gap can be understood as a gap in the bezel 11 filled with a non-metallic material (insulating material), in which case the gap is visible on the appearance surface. When the outer surface of the bezel 11 is a non-conductive material, the insulating gap can be understood as the end portion of the inner surface of the bezel 11 (for example, the end portion not electrically connected to other radiators or conductors), or as the gap between the radiators of the inner surface of the bezel 11, which can be filled with a non-metallic material (insulating material), or can not be filled with a non-metallic material, for example, filled with air, in which case the gap is not visible on the appearance surface.

[0119] The middle frame 19 can include the bezel 11, and the middle frame 19 including the bezel 11 as a unitary piece can support the electronic devices in the entire machine. The cover plate 13 and the back cover 21 are respectively attached along the upper and lower edges of the bezel to form a housing of the electronic device. In one embodiment, the cover plate 13, the back cover 21, the bezel 11, and / or the middle frame 19 can be collectively referred to as a housing of the electronic device 100. It should be understood that the "housing" can be used to refer to part or all of any one of the cover plate 13, the back cover 21, the bezel 11, or the middle frame 19, or part or all of any combination of the cover plate 13, the back cover 21, the bezel 11, or the middle frame 19.

[0120] The frame 11 can at least partially serve as an antenna radiator to receive / transmit radio frequency signals. The portion of the frame 11 serving as the radiator can have a gap with other portions of the middle frame 19, so as to ensure that the antenna radiator has a good radiation environment. In an embodiment, the middle frame 19 can be provided with an aperture at the portion of the frame 11 serving as the radiator, to facilitate the radiation of the antenna.

[0121] Alternatively, the frame 11 can not be considered as a part of the middle frame 19. In an embodiment, the frame 11 can be connected to the middle frame 19 and integrally formed. In another embodiment, the frame 11 can include a protrusion extending inwardly to be connected to the middle frame 19, for example, by means of a spring, a screw, welding, etc. The protrusion of the frame 11 can also be used to receive a feeding signal, so that at least a portion of the frame 11 serves as an antenna radiator to receive / transmit radio frequency signals. The portion of the frame 11 serving as the radiator can have a gap with the middle frame 19, so as to ensure that the antenna radiator has a good radiation environment, and the antenna has a good signal transmission function.

[0122] The back cover 21 can be made of a metal material; can also be made of a non-conductive material, such as a glass back cover, a plastic back cover, or other non-metal back cover; or can be made of a back cover including both conductive and non-conductive materials. In an embodiment, the back cover 21 including the conductive material can replace the middle frame 19 and be integrated with the frame 11, to support the electronic devices in the whole machine.

[0123] In an embodiment, the conductive portion of the middle frame 19 and / or the back cover 21 can serve as a reference ground of the electronic device 100, and the frame 11, the PCB 17, etc. of the electronic device can be grounded by electrical connection with the middle frame.

[0124] The antenna of the electronic device 100 can also be disposed in the housing, such as a bracket antenna, a millimeter wave antenna, and the like (not shown in FIG. 1). The clearance of the antenna disposed in the housing can be obtained by a slit / hole on any one of the middle frame, the bezel, the back cover, and the display screen, or a non-conductive gap / aperture formed between any two of them, and the clearance of the antenna can be configured to ensure the radiation characteristics of the antenna. It should be understood that the clearance of the antenna can be a non-conductive area formed by any conductive component in the electronic device 100, through which the antenna radiates signals to the external space. In an embodiment, the antenna 40 can be in the form of a flexible printed circuit (FPC) based antenna, a laser-direct-structuring (LDS) based antenna, a microstrip disk antenna (MDA), or the like. In an embodiment, the antenna can also be in the form of a transparent structure embedded in the screen of the electronic device 100, so that the antenna is a transparent antenna unit embedded in the screen of the electronic device 100.

[0125] FIG. 2 is a structural schematic diagram of a foldable electronic device 100 according to an embodiment of the present application. The foldable electronic device 100 can be a mobile phone, a tablet computer, an e-book reader, a notebook computer, a wearable device such as a watch, or the like, which has a folding function. The embodiment shown in FIG. 2 is described by taking a foldable mobile phone as an example.

[0126] It should be understood that only the electronic device 100 including one housing (for example, the above-mentioned middle frame 19) is shown in FIG. 1, and in actual production or design, the electronic device 100 can also include multiple housings to form the foldable electronic device 100.

[0127] Referring to FIG. 2, the foldable electronic device 100 can include a flexible display screen 110 (which can correspond to the display module 15 in FIG. 1), a first bezel 121 (which can correspond to the bezel 11 in FIG. 1), a first cover 122, a second bezel 123 (which can correspond to the bezel 11 in FIG. 1), a second cover 124, and a hinge 125. In some embodiments, the first bezel 121, the first cover 122, the second bezel 123, and the second cover 124 can form a first housing 126 (which can correspond to the middle frame 19 in FIG. 1) and a second housing 127 (which can correspond to the middle frame 19 in FIG. 1) supporting the flexible display screen 110. In other embodiments, at least one of the first cover 122 and the second cover 124 can include a display screen.

[0128] The dot matrix pattern filled in FIG. 2 can schematically represent the flexible display 110. The flexible display 110 can have strong flexibility and bendability, and can provide a new interaction mode based on the bendability for a user.

[0129] The flexible display 110 can include a first display portion 111 corresponding to the first housing 126, a second display portion 112 corresponding to the second housing 127, and a foldable display portion 113 corresponding to the hinge 125. The foldable display portion 113 can be connected between the first display portion 111 and the second display portion 112.

[0130] The first bezel 121 can surround an outer periphery of the first cover 122, and at least a portion of the first bezel 121 can also surround an outer periphery of the first display portion 111. The first display portion 111 can be disposed in parallel with the first cover 122 with a space therebetween, and the first display portion 111 and the first cover 122 can be located on both sides of the first bezel 121. The space between the first display portion 111 and the first cover 122 can be used to dispose devices of the foldable electronic device 100, such as an antenna, a circuit board assembly, or the like.

[0131] The second bezel 123 can surround an outer periphery of the second cover 124, and at least a portion of the second bezel 123 can also surround an outer periphery of the second display portion 112. The second display portion 112 can be disposed in parallel with the second cover 124 with a space therebetween, and the second display portion 112 and the second cover 124 can be located on both sides of the second bezel 123. The space between the second display portion 112 and the second cover 124 can be used to dispose devices of the foldable electronic device 100, such as an antenna, a circuit board assembly, or the like.

[0132] In an embodiment provided in the present application, the cover and the bezel can be two parts of the housing of the foldable electronic device 100, and the cover and the bezel can be connected, and the connection form can not belong to assembly methods such as clamping, sticking, welding, riveting, and clearance fitting. The connection relationship between the cover and the bezel is generally difficult to be divided. In another embodiment provided in the present application, the cover and the bezel can be two different components. By assembling the cover and the bezel together, the housing of the foldable electronic device 100 can be formed.

[0133] The hinge 125 can be connected between the first housing 126 and the second housing 127. Under the action of the hinge 125, the first housing 126 and the second housing 127 can approach or move away from each other. Accordingly, the first display portion 111 of the flexible display 110 and the second display portion 112 of the flexible display 110 can approach or move away from each other, so that the flexible display 110 can be folded or unfolded.

[0134] In one example, the rotating shaft 125 can include a main shaft, a first connecting assembly, and a second connecting assembly. The first connecting assembly can be fixed with the first cover 122, and the second connecting assembly can be fixed with the second cover 124. The first connecting assembly and the second connecting assembly can rotate relative to the main shaft. Through the mutual movement of the first connecting assembly and the second connecting assembly, the mutual movement of the first shell 126 and the second shell 127 can be driven, and the opening and closing function of the foldable electronic device 100 can be realized.

[0135] The foldable electronic device 100 shown in FIG. 2 is currently in a possible unfolded state. In the unfolded state, the angle between the first shell 126 and the second shell 127 can be 180°, or can be referred to as a flat state. The flexible display screen 110 can be in a flat state as shown in FIG. 2.

[0136] In the flat state, the angle between the first display part 111 corresponding to the first shell 126 and the second display part 112 corresponding to the second shell 127 can be 180°. Due to possible errors in engineering implementation, when the angle between the first display part 111 and the second display part 112 is between 170° and 190°, the flexible display screen 110 can be considered to be in a flat state.

[0137] FIG. 3 shows a possible closed state of the foldable electronic device 100. In FIG. 3, the outward closed state of the foldable electronic device 100 is shown (the outward closed state can be referred to as an outward folding state). The outward closed state shown in FIG. 3 can be, for example, a left-right outward closed state or an up-down outward closed state. In the following, a possible closed state of the foldable electronic device 100 is described in combination with FIG. 2 and FIG. 3.

[0138] In the embodiments of the present application, the closed state of the foldable electronic device 100 can mean that the foldable electronic device 100 is currently bent, and the bending degree of the foldable electronic device 100 reaches the maximum. At this time, the first cover 122 and the second cover 124 can be approximately parallel, spaced apart from each other, and arranged face to face, and the spacing distance between the first cover 122 and the second cover 124 is the smallest. At least part of the first shell 126 and the second shell 127 are accommodated in the space surrounded by the flexible display screen 110; the first display part 111, the first shell 126, the second shell 127, and the second display part 112 are sequentially stacked. Similarly, the first display part 111 and the second display part 112 can be approximately parallel and spaced apart from each other, and the spacing distance between the first cover 122 and the second cover 124 is smaller than the spacing distance between the first display part 111 and the second display part 112. At this time, the first display part 111 and the second display part 112 can be considered to be located on different planes.

[0139] In combination with FIGS. 2 and 3, when the foldable electronic device 100 is in the outer folding state, the first cover 122 and the second cover 124 can be close to each other, and the first display 111 and the second display 112 can be close to each other. The first display 111, the second display 112, and the foldable display 113 can form a housing area for accommodating the first cover 122, the second cover 124, and the hinge 125. That is, the first cover 122, the second cover 124, and the hinge 125 can be accommodated in the interval space between the first display 111 and the second display 112.

[0140] It should be understood that the foldable electronic device 100 can be folded inwardly (the inwardly closed state can be referred to as an inner folding state). When the foldable electronic device 100 is in the inner folding state, the first cover 122 and the second cover 124 can be close to each other, and the first display 111 and the second display 112 can be close to each other. The first cover 122, the second cover 124, and the hinge 125 can form a housing area for accommodating the first display 111, the second display 112, and the foldable display 113. That is, the first display 111, the second display 112, and the foldable display 113 can be accommodated in the interval space between the first cover 122 and the second cover 124.

[0141] The foldable electronic device 100 can be switched between the closed state and the unfolded state. When the foldable electronic device 100 is in the closed state, the foldable electronic device 100 has a relatively small footprint; when the foldable electronic device 100 is in the unfolded state, the foldable electronic device 100 can display a relatively large screen to increase the viewable range of the user. It should be understood that when the foldable electronic device 100 is switched from the closed state to the unfolded state, the intermediate process can be understood as the folding state of the foldable electronic device 100, and during the switching process, the footprint of the foldable electronic device 100 increases, and the screen area increases.

[0142] The foldable electronic device 100 can further include a third housing 128 and a hinge 129, as shown in FIG. 4. The hinge 129 can be connected between the third housing 128 and the second housing 127. The third housing 128 and the second housing 127 can be close to or away from each other. As the number of foldable parts of the foldable electronic device 100 increases, in the case of keeping the same screen size in the unfolded state, the footprint of the foldable electronic device 100 can be further reduced in the folded state.

[0143] In the foldable electronic device 100 shown in FIG. 4, since there are three foldable parts (the first housing 126, the second housing 127, and the third housing 128), the foldable electronic device 100 has at least three forms: 1, the unfolded state; 2, the folded state; and 3, the partially unfolded state.

[0144] 1. As shown in FIG. 4, it is a possible unfolded state of the foldable electronic device 100. In the unfolded state, the angle between the first housing 126, the second housing 127 and the third housing 128 can be about 180°. The flexible display screen 110 can be in the unfolded state.

[0145] 2. As shown in FIG. 5, it is a possible folded state (three-fold state) of the foldable electronic device 100. In the folded state, the first housing 126 and the second housing 127 are rotated along the rotation shaft 125, and the second housing 127 and the third housing 128 are rotated along the rotation shaft 129, so that the bending degree of the foldable electronic device 100 reaches the maximum. At this time, the first housing 126, the second housing 127 and the third housing 128 can be regarded as being located on different planes.

[0146] It should be understood that, for the sake of brevity of discussion, in the structure shown in FIG. 5, the folded state of the foldable electronic device 100 is S-fold (the side of the foldable electronic device 100 is in the shape of S, and the second housing 127 is located between the first housing 126 and the third housing 128). In an embodiment, the closed state of the foldable electronic device 100 can also be G-fold (the side of the foldable electronic device 100 is in the shape of G, and the third housing 128 is located between the first housing 126 and the second housing 127). The embodiment of the present application does not limit the closed state of the foldable electronic device 100.

[0147] 3. As shown in FIG. 6, it is a possible partially unfolded state (two-fold state) of the foldable electronic device 100. In the partially unfolded state, the angle between the first housing 126 and the second housing 127 can be about 180°, and the second housing 127 and the third housing 128 are rotated along the rotation shaft 129, so that the third housing 128 approaches the second housing 127. At this time, the first housing 126 and the second housing 127 are regarded as being located on the same plane, and the second housing 127 and the third housing 128 can be regarded as being located on different planes. In another possible partially unfolded state, the angle between the third housing 128 and the second housing 127 can be about 180°, and the first housing 126 and the second housing 127 are rotated along the rotation shaft 125, so that the first housing 126 approaches the second housing 127.

[0148] FIGS. 1 and 2 only schematically show some components included in the electronic device 10 and the foldable electronic device 100, and the actual shape, the actual size and the actual structure of these components are not limited by the above-mentioned drawings.

[0149] It should be understood that, in the embodiment of the present application, the face where the display screen of the electronic device is located can be regarded as the front face, the face where the back cover is located can be regarded as the back face, and the face where the frame is located can be regarded as the side face.

[0150] It should be appreciated that in embodiments of the present application, the orientation of the electronic device when held by a user (typically held vertically and facing the screen) is considered to have a top, a bottom, a left side, and a right side.

[0151] Firstly, two antenna modes will be involved in the present application, which are introduced by FIG. 7 and FIG. 8. FIG. 7 is a schematic diagram of the structure of a common mode of an antenna and the corresponding distribution of current and electric field. FIG. 8 is a schematic diagram of the structure of a differential mode of another antenna and the corresponding distribution of current and electric field. The open ends of the antenna radiators in FIG. 7 and FIG. 8 can be referred to as line common mode and line differential mode, respectively.

[0152] It should be appreciated that the "common mode" or "CM mode" in the present application includes line common mode and slot common mode, and the "differential mode" or "DM mode" in the present application includes line differential mode and slot differential mode, which can be determined according to the structure of the antenna.

[0153] It should be appreciated that the "common-differential mode" or "CM-DM mode" in the present application refers to the line common mode and the line differential mode generated on the same radiator, or refers to the slot common mode and the slot differential mode generated on the same radiator, which can be determined according to the structure of the antenna.

[0154] 1. Line (Wire) common mode (CM) mode

[0155] (a) of FIG. 7 shows that the ends of the radiator of the antenna 40 are open, and a feeding circuit (not shown in the figure) is connected at the middle position 41. In an embodiment, the feeding form of the antenna 40 adopts symmetrical feed. The feeding circuit can be connected to the middle position 41 of the antenna 40 through the feeding line 42. It should be appreciated that symmetrical feed can be understood as that one end of the feeding circuit is connected to the radiator, and the other end is coupled to the ground plane to achieve grounding, wherein the connection point (feeding point) of the feeding circuit and the radiator is located at the center of the radiator, for example, it can be the midpoint of the geometric structure, or the midpoint of the electrical length (or a region within a certain range near the above-mentioned midpoint).

[0156] The middle position 41 of the antenna 40, for example, can be the geometric center of the antenna, or the midpoint of the electrical length of the radiator, for example, the connection between the feeding line 42 and the antenna 40 covers the middle position 41.

[0157] Fig. 7(b) shows the current and electric field distribution of the antenna 40. As shown in Fig. 7(b), the current presents a reverse distribution, for example, a symmetrical distribution, on both sides of the middle position 41; the electric field presents a same direction distribution on both sides of the middle position 41. As shown in Fig. 7(b), the current at the feed line 42 presents a same direction distribution. Based on the same direction distribution of the current at the feed line 42, the feed shown in Fig. 7(a) can be referred to as a line CM feed. Based on the reverse distribution of the current on both sides of the connection between the radiator and the feed line 42, the antenna mode shown in Fig. 7(b) can be referred to as a line CM mode (which can also be referred to as a CM mode, for example, for a line antenna, the CM mode refers to the line CM mode). The current and electric field shown in Fig. 7(b) can be referred to as the current and electric field of the line CM mode, respectively.

[0158] The current is stronger at the middle position 41 of the antenna 40 (the current is larger near the middle position 41 of the antenna 40), and weaker at both ends of the antenna 40, as shown in Fig. 7(b). The electric field is weaker at the middle position 41 of the antenna 40, and stronger at both ends of the antenna 40.

[0159] 2. Line differential mode (DM) mode

[0160] As shown in Fig. 8(a), the left and right ends of the two radiators of the antenna 50 are open ends, and the feed circuit is connected at the middle position 51. In an embodiment, the feed form of the antenna 50 adopts an anti-symmetrical feed. One end of the feed circuit is connected to one of the radiators through the feed line 52, and the other end of the feed circuit is connected to the other radiator through the feed line 52. The middle position 51 can be the geometric center of the antenna 50, or the gap formed between the radiators.

[0161] It should be understood that the "center anti-symmetrical feed" mentioned in the present application can be understood as that the positive and negative poles of the feed unit are connected to the two connection points near the above-mentioned midpoint of the radiator. In an embodiment, the signal amplitudes output by the positive and negative poles of the feed unit are the same, and the phases are opposite, for example, the phases are opposite by 180°±10°.

[0162] Fig. 8 (b) shows the current and electric field distribution of the antenna 50. As shown in Fig. 8 (b), the current presents a same direction distribution, for example, an anti-symmetrical distribution, on both sides of the middle position 51 of the antenna 50; the electric field presents a reverse distribution on both sides of the middle position 51. As shown in Fig. 8 (b), the current at the feeding wire 52 presents a reverse distribution. Based on the reverse distribution of the current at the feeding wire 52, the feeding shown in Fig. 8 (a) can be called a line DM feeding. Based on the same direction distribution of the current on both sides of the connection between the radiator and the feeding wire 52, the antenna mode shown in Fig. 8 (b) can be called a line DM mode (also can be simply called a DM mode, for example, for a line antenna, the DM mode refers to a line DM mode). The current and electric field shown in Fig. 8 (b) can be respectively called the current and electric field of the line DM mode. It can be understood that based on the same direction distribution of the current on both sides of the connection between the radiator and the feeding wire 52, the antenna mode shown in Fig. 8 (b) can also be called a half antenna mode, or a half wavelength mode, or simply a half mode.

[0163] In one embodiment, in the line DM mode, or the half mode, the current is stronger at the middle position 51 of the antenna 50 (the current is larger near the middle position 51 of the antenna 50), and is weaker at both ends of the antenna 50, as shown in Fig. 8 (b). The electric field is weaker at the middle position 51 of the antenna 50, and is stronger at both ends of the line antenna 50.

[0164] It should be understood that for the antenna radiator, which can be understood as a metal structure that generates radiation, the number can be one, as shown in Fig. 7, or can also be two, as shown in Fig. 8, which can be adjusted according to the actual design or production needs. For example, for the line CM mode, two radiators can also be used as shown in Fig. 8, the two ends of the two radiators are oppositely arranged and spaced apart by a gap, and a symmetrical feeding mode is used at the two ends close to each other, for example, the same feed signal is fed into the two ends close to each other of the two radiators, respectively, and similar effects to the antenna structure shown in Fig. 7 can also be obtained. Correspondingly, for the line DM mode, one radiator can also be used as shown in Fig. 7, two feeding points are arranged at the middle position of the radiator and an anti-symmetrical feeding mode is used, for example, signals with the same amplitude and opposite phase are fed into the two symmetrical feeding points on the radiator, respectively, and similar effects to the antenna structure shown in Fig. 8 can also be obtained.

[0165] 3. Line CM-DM mode

[0166] Figs. 7 and 8 above respectively show that when the two ends of the radiator are open, different feeding modes are used to generate the line CM mode and the line DM mode, respectively.

[0167] When the feeding form of the antenna is asymmetric feeding (the feeding point deviates from the middle position of the radiator, including edge feeding or offset feeding), or the ground point (coupled with the floor) of the radiator is asymmetric (the ground point deviates from the middle position of the radiator), the antenna can simultaneously generate a first resonance and a second resonance, corresponding to a line CM mode and a line DM mode respectively. For example, the first resonance corresponds to the line CM mode, and the current and electric field distribution is as shown in (b) of FIG. 7. The second resonance corresponds to the line DM mode, and the current and electric field distribution is as shown in (b) of FIG. 8.

[0168] Since the above-mentioned antenna structures can generate two working modes (the electric field is symmetrically distributed or antisymmetrically distributed) with orthogonal electric fields (the electric field is integrated to zero (integral orthogonal) in the far field), the isolation between the two working modes (line CM mode and line DM mode) of the antenna structure is good, and the antenna structure can be applied to a multi-input multi-output (MIMO) antenna system in an electronic device.

[0169] FIG. 9 is a schematic diagram of an electronic device 100 provided by an embodiment of the present application.

[0170] It should be understood that, for the sake of brevity of discussion, only the electronic device 100 is taken as an example of a foldable electronic device, and only the first housing 201 and the second housing 202 are taken as examples for description. The first housing 201 and the second housing 202 can be rotationally connected with the rotation shaft 203.

[0171] As shown in FIG. 9, the first housing 201 includes a first bezel 210. The second housing 202 includes a second bezel 220.

[0172] The electronic device 100 includes a first antenna 301 and a second antenna 302. The first antenna 301 includes a first radiator 310. The second antenna 302 includes a second radiator 320.

[0173] The first radiator 310 is a conductive part of the first bezel 210 between the first position 211 and the second position 212. The second radiator 320 is a conductive part of the second bezel 220 between the third position 213 and the fourth position 214.

[0174] When the electronic device 100 is in a closed state, the first radiator 310 and the second radiator 320 at least partially overlap in a first direction, as shown in FIG. 9. The first direction is the thickness direction of the electronic device 100, or it can also be the direction (for example, the x direction) perpendicular to the display screen when the electronic device 100 is in an unfolded state.

[0175] It should be understood that, when the electronic device 100 is in the closed state, when the working frequency band of the first antenna 301 and the working frequency band of the second antenna 302 are close, the electronic device 100 communicates through the first antenna 301 and the second antenna 302 at the same time, the first antenna 301 can be coupled to generate a stronger current at the second radiator 320, the second antenna 302 can be coupled to generate a stronger current at the first radiator 310, the coupling between the first radiator 310 and the second radiator 320 is stronger, the isolation between the first antenna 301 and the second antenna 302 is poorer, and the electronic device 100 cannot communicate through the first antenna 301 and the second antenna 302 at the same time.

[0176] The electronic device provided in the embodiments of the present application includes a first shell and a second shell which are foldably arranged, and a first antenna and a second antenna. The first antenna has a first radiator formed by a conductive part of a frame of the first shell. The second antenna has a second radiator formed by a conductive part of a frame of the second shell. The electronic device has a good isolation between the first antenna and the second antenna in a closed state, and the first antenna and the second antenna can work at the same time to improve the communication performance of the electronic device.

[0177] FIG. 10 is a schematic diagram of an electronic device 100 provided in the embodiments of the present application.

[0178] It should be understood that the electronic device 100 described in the embodiments of the present application is only a schematic diagram, and only the structure of the region related to the embodiments of the present application is shown. In actual production or design, other regions can be adjusted. For example, the frame (for example, the first frame or the second frame) has multiple insulating gaps or is coupled to the ground at multiple points to form a radiator or a parasitic branch of another antenna, which is not limited in the embodiments of the present application.

[0179] As shown in FIG. 10, the electronic device 100 can include a first shell 201, a second shell 202, and a ground plate 300.

[0180] The first shell 201 includes a first frame 210, and at least a part of the first frame 210 is arranged to be spaced apart from the ground plate 300. The second shell 202 includes a second frame 220, and at least a part of the second frame 220 is arranged to be spaced apart from the ground plate 300.

[0181] The first housing 201 and the second housing 202 are configured to be folded relative to each other to a closed state of the electronic device 100. In one embodiment, the electronic device 100 further comprises a first rotation shaft 203. The first rotation shaft 203 is located between the first housing 201 and the second housing 202, and the first rotation shaft 203 is rotationally connected with the first housing 201 and the second housing 202 respectively, so that the first housing 201 and the second housing 202 can rotate relative to each other. In one embodiment, the floor 300 can comprise a first part and a second part, the first part can be located in the first housing 201, and the second part can be located in the second housing 202, and the first part and the second part can be connected by the first rotation shaft 203.

[0182] It should be understood that, for the sake of brevity of discussion, in the electronic device 100 shown in FIG. 10, the electronic device 100 is a foldable electronic device, and the first rotation shaft 203 is directly connected with the first housing 201 and the second housing 202 respectively, so that the first housing 201 and the second housing 202 can rotate relative to each other. In addition, in actual production or design, "the first rotation shaft 203 is rotationally connected with the first housing 201 and the second housing 202 respectively" includes the case that the first rotation shaft 203 can be rotationally connected with the first or second housing through one or more second rotation shafts and one or more intermediate housings. For example, in one embodiment, the electronic device 100 can further comprise a first rotation shaft and a second rotation shaft, and one or more intermediate housings located between the first rotation shaft and the second rotation shaft. The first rotation shaft is located between the first housing 201 and the intermediate housing, and the first rotation shaft is rotationally connected with the first housing 201 and the intermediate housing respectively, so that the first housing 201 and the intermediate housing can rotate relative to each other. The second rotation shaft is located between the intermediate housing and the second housing 202, and the first rotation shaft 203 is rotationally connected with the intermediate housing and the second housing 202 respectively, so that the intermediate housing and the second housing 202 can rotate relative to each other. For example, the electronic device 100 further comprises a third housing and a second rotation shaft, the third housing is located between the first housing and the second housing, the second rotation shaft is located between the third housing and the first housing, the second rotation shaft is located between the third housing and the second housing, and the first rotation shaft is rotationally connected with the third housing and the first housing respectively, and the second rotation shaft is rotationally connected with the third housing and the second housing respectively. In one embodiment, the first rotation shaft 203 is directly connected with the first housing 201 and the second housing 202 respectively, and one side of the first housing 201 or one side of the second housing 202 is further rotationally connected with at least one housing. For example, the electronic device 100 further comprises a third housing and a second rotation shaft, the second housing is located between the first housing and the third housing, the second rotation shaft is located between the third housing and the second housing, and the second rotation shaft is rotationally connected with the third housing and the second housing respectively.

[0183] The first bezel 210 includes a first position 211, a second position 212, and a third position 213 arranged in sequence. The first bezel 210 has a first insulating gap and a second insulating gap at the first position 211 and the second position 212, respectively. The first bezel 210 is coupled with the floor 300 at the third position 213.

[0184] The second bezel 220 includes a fourth position 214, a fifth position 215, and a sixth position 216 arranged in sequence. The second bezel 220 has a third insulating gap and a fourth insulating gap at the fourth position 214 and the fifth position 215, respectively. The second bezel 220 is coupled with the floor 300 at the sixth position 216.

[0185] The electronic device 100 includes a first antenna 401 and a second antenna 402.

[0186] The first antenna 401 includes a first radiator 410. The first radiator 410 includes a conductive portion of the first bezel 210 between the first position 211 and the third position 213. At least a portion of the first radiator 410 is spaced apart from the floor 300.

[0187] In an embodiment, the first antenna 401 further includes a first feeding circuit 411. The first radiator 410 includes a first feeding point 412. The first feeding circuit 411 is coupled with the first feeding point 412 to feed a radio frequency signal of a first frequency band.

[0188] The second antenna 402 includes a second radiator 420. The second radiator 420 includes a conductive portion of the second bezel 220 between the fourth position 214 and the sixth position 216. At least a portion of the second radiator 420 is spaced apart from the floor 300.

[0189] In an embodiment, the second antenna 402 further includes a second feeding circuit 421. The second radiator 420 includes a second feeding point 422. The second feeding circuit 421 is coupled with the second feeding point 422 to feed a radio frequency signal of a second frequency band.

[0190] It should be understood that the first feeding point 412 can be located at any position of the first radiator 410. For example, the first feeding point 412 is located between the first position 211 and the second position 212, or between the second position 212 and the third position 213. Similarly, the second feeding point 422 can also be understood accordingly. For the sake of brevity of the discussion, only the case where the first feeding point 412 is located between the first position 211 and the second position 212, and the second feeding point 422 is located between the fifth position 215 and the sixth position 216 is described, and the other cases are not described herein.

[0191] In one embodiment, when the electronic device 100 is in the closed state, the distance between the first position 211 and the fourth position 214 is less than the distance between the first position 211 and the sixth position 216, and the distance between the third position 213 and the fourth position 214 is greater than the distance between the third position 213 and the sixth position 216, as shown in FIG. 11.

[0192] It should be understood that the open end of the second radiator 420 can be disposed close to the open end of the first radiator 410, and the grounded end of the second radiator 420 can be disposed close to the grounded end of the first radiator 410. The open end of the first radiator 410 is close to the open end of the second radiator 420, and the electric field is strong in the vicinity of the open end. Therefore, the first antenna 401 and the second antenna 402 have strong coupling between them.

[0193] In one embodiment, when the electronic device 100 is in the closed state, the projection of the first radiator 410 on the second bezel 220 at least partially overlaps the second radiator 420. In one embodiment, when the electronic device 100 is in the closed state, the ratio between the length L' of the overlapping portion of the projection of the first radiator 410 on the second bezel 220 and the length L2 of the second radiator 420 satisfies: (L' / L2)≥0.5. In one embodiment, when the electronic device 100 is in the closed state, the ratio between the length L' of the overlapping portion of the projection of the first radiator 410 on the second bezel 220 and the length L2 of the second radiator 420 satisfies: (L' / L2)≥0.8. In one embodiment, when the electronic device 100 is in the closed state, the ratio between the length L' of the overlapping portion of the projection of the first radiator 410 on the second bezel 220 and the length L2 of the second radiator 420 satisfies: (L' / L2)=1. It should be understood that when the above ratio is equal to 1, it can be understood that the length of the first radiator 410 is greater than or equal to the length of the second radiator 420.

[0194] In one embodiment, when the electronic device 100 is in the closed state, the ratio between the length L' of the overlapping portion of the projection of the first radiator 410 on the second bezel 220 and the length L1 of the first radiator 410 satisfies: (L' / L1)=1. It should be understood that the length of the first radiator 410 is less than or equal to the length of the second radiator 420.

[0195] It should be understood that due to the at least partial overlap of the first radiator 410 and the second radiator 420 in the first direction, the first antenna 401 and the second antenna 402 have strong coupling between them. The first direction is the thickness direction of the electronic device 100, or, when the electronic device 100 is in the unfolded state, the first direction is the direction perpendicular to the display screen, for example, the x direction.

[0196] The first radiator 410 includes a first connection point 431 and a second connection point 432, and the second insulating gap (the second position 212) is located between the first connection point 431 and the second connection point 432. In an embodiment, the first connection point 431 is located between the first position 211 and the second position 212, and the second connection point 432 is located between the second position 212 and the third position 213.

[0197] The first antenna 401 can further include a first switch 441 and a first switch branch 451. The first switch branch 451 is coupled between the first connection point 431 and the second connection point 432 through the first switch 441. In an embodiment, the first switch 441 and the first switch branch 451 are coupled between the first connection point 431 and the second connection point 432. The first connection port of the first switch 441 is coupled with the first switch branch 451.

[0198] It should be understood that the first switch 441 and the first switch branch 451 can be connected in series between the first connection point 431 and the second connection point 432, the first switch 441 can be located between the first switch branch 451 and the first connection point 431, and the first switch 441 can also be located between the first switch branch 451 and the second connection point 432. In the embodiments of the present application, the switch and the switch branch coupled with the switch can be understood accordingly, and the switch is used to determine the conduction (coupling) or disconnection (uncoupling) between the switch branch and the connection point. For the sake of brevity of the discussion, it will not be repeated.

[0199] In the embodiments of the present application, the switch branch can include one or more elements, and the plurality of elements can be connected in series or in parallel to achieve different equivalent capacitance values and / or equivalent inductance values and / or equivalent resistance values. In one embodiment, the switch branch can also include a switch, and the equivalent capacitance values and / or equivalent inductance values and / or equivalent resistance values of different states of the switch branch can be switched by the switch. In the embodiments of the present application, the switch branch can also not include elements. The switch branch can be used to determine the electrical connection state at the connection point (the electrical connection state between the connection point and the ground, or the electrical connection state between the connection point and the adjacent connection point). For example, the first switch branch 451 can be used to determine the electrical connection state between the first connection point 431 and the second connection point 432. When the first switch branch 451 is in an open circuit state, when the common port of the first switch 441 is connected to the first switch branch 451, the first connection point 431 and the second connection point 432 are in an open circuit state (the first connection point 431 and the second connection point 432 are not coupled by a device). Alternatively, the first switch branch 451 is in a short circuit state, and when the common port of the first switch 441 is connected to the switch branch, the first connection point 431 and the second connection point 432 are in a short circuit state (the first connection point 431 and the second connection point 432 are directly electrically connected without other elements).

[0200] The operating frequency band of the first antenna 401 includes a first frequency band. The operating frequency band of the second antenna 402 includes a second frequency band. The first frequency band and the second frequency band are adjacent (the frequency difference between the center frequency of the first frequency band and the center frequency of the second frequency band is less than or equal to 300 MHz). In one embodiment, the frequency difference between the center frequency of the first frequency band and the center frequency of the second frequency band is less than or equal to 100 MHz. In one embodiment, the frequency difference between the center frequency of the first frequency band and the center frequency of the second frequency band is less than or equal to fifteen percent of the center frequency of the first frequency band, or fifteen percent of the center frequency of the second frequency band. In one embodiment, the frequency difference between the center frequency of the first frequency band and the center frequency of the second frequency band is less than or equal to one tenth of the center frequency of the first frequency band, or one tenth of the center frequency of the second frequency band. In one embodiment, the center frequency f1 of the first frequency band and the center frequency f2 of the second frequency band satisfy: 0.85 x f1≤f2≤1.15 x f1. In one embodiment, the center frequency f1 of the first frequency band and the center frequency f2 of the second frequency band satisfy: 0.9 x f1≤f2≤1.1 x f1.

[0201] For example, the operating frequency band (first frequency band) of the first antenna 401 includes L1 (1578.42±1.023MHz) in the global positioning system (GPS), and the operating frequency band (second frequency band) of the second antenna 402 includes B3 (1.71GHz-1.785GHz) in the LTE. Alternatively, for example, the operating frequency band (first frequency band) of the first antenna 401 includes 2.4G frequency band (2.4GHz-2.4835GHz) in the wireless network communication technology (Wi-Fi) or the bluetooth (BT) (2.4GHz-2.4835GHz), and the operating frequency band (second frequency band) of the second antenna 402 includes B7 (2.5GHz-2.57GHz) or B41 (2.496GHz-2.69GHz) in the LTE.

[0202] It should be understood that, in the above embodiments, only the parts of the communication frequency bands that can be included in the first frequency band and the second frequency band are exemplified, and other communication frequency bands can also be included in actual production or design, which is not limited in the embodiments of the present application.

[0203] The first radiator 410 and the first switch branch 451 are used to generate a first resonance and a second resonance, and the resonance point frequency of the first resonance is smaller than the resonance point frequency of the second resonance. The resonance frequency band of the second resonance includes the first frequency band. The second radiator 420 is used to generate a third resonance, and the resonance frequency band of the third resonance includes the second frequency band.

[0204] In one embodiment, at the resonance point of the second resonance, the current on the first radiator 410 includes a current zero point. In one embodiment, at the resonance point of the third resonance, the current on the second radiator 420 is in the same direction. In one embodiment, at the resonance point of the first resonance, the current on the second radiator 420 is in the same direction.

[0205] It should be understood that, since the current and the electric field have a corresponding relationship, the above-mentioned current zero point can also be understood as an electric field maximum point, and on both sides of the current zero point, the directions of the currents are different (opposite distribution), and on both sides of the electric field maximum point, the directions of the electric fields are the same (same direction distribution).

[0206] According to the embodiment of the present application, when the first radiator 410 generates the first resonance and the second resonance, the first resonance can be generated by the base mode of the first radiator 410, and the second resonance can be generated by the high-order mode of the first radiator 410, when the electronic device 100 is in the closed state. Since the second resonance is generated by the high-order mode, the current generated on the first radiator 410 includes a current zero point (for example, at the resonance point of the second resonance), and the current distribution on the first radiator 410 is similar to the current distribution generated by the line CM mode in the above-described embodiment. At the resonance point of the second resonance, the current coupled by the first radiator 410 on the second radiator 420 also includes a current zero point (including part of the reverse current in the current), and the current distribution on the second radiator 420 is similar to the current distribution generated by the line CM mode in the above-described embodiment.

[0207] When the second radiator 420 generates the third resonance (for example, at the resonance point of the third resonance), since the current generated on the second radiator 420 is in the same direction and does not include a current zero point, the current distribution on the second radiator 420 is similar to the current distribution generated by the line DM mode in the above-described embodiment, when the electronic device 100 is in the closed state. At the resonance point of the third resonance, the current coupled by the second radiator 420 on the first radiator 410 is mostly in the same direction, and the current distribution on the first radiator 410 is similar to the current distribution generated by the line DM mode in the above-described embodiment.

[0208] The current distribution generated by the second resonance on the first radiator 410 is similar to the current distribution generated by the line CM mode, and the current distribution coupled by the second radiator 420 is similar to the current distribution generated by the line DM mode. The current distribution generated by the third resonance on the second radiator 420 is similar to the current distribution generated by the line DM mode, and the current distribution coupled by the first radiator 410 is similar to the current distribution generated by the line CM mode. Since the isolation between the line CM mode and the line DM mode is good, the interference between the current similar to the line CM mode distribution and the current similar to the line DM mode distribution on the first radiator 410 and the second radiator 420 is small, and the first antenna 401 and the second antenna 402 have good isolation.

[0209] Meanwhile, the second radiator 420 has a structure with one end grounded and the other end open. The fourth insulating gap of the second radiator 420 can be regarded as an equivalent capacitor (e.g., a distributed capacitor) arranged on the second radiator 420, which can make the second radiator 420 form a meta material structure. The second radiator 420 with the meta material structure can increase the radiation aperture, and the electric field is more dispersed after the fourth insulating gap. In an embodiment, the dielectric loss near the second radiator 420 forming the meta material structure is reduced, and thus the radiation characteristics (e.g., system efficiency and radiation efficiency) of the second antenna 402 can be effectively improved.

[0210] In an embodiment, the electrical length of the second radiator 420 is greater than three-eighths of the first wavelength. The first wavelength is the dielectric wavelength corresponding to the third resonance generated by the second radiator 420.

[0211] It should be understood that the third resonance generated by the second radiator 420 can correspond to a quarter-wave mode, and the electrical length of the second radiator 420 can be greater than three-eighths of the first wavelength through the fourth insulating gap, and the current on the second radiator 420 is in the same direction (e.g., does not reverse). The electrical length of the second radiator 420 is increased from one-quarter of the first wavelength to more than three-eighths of the first wavelength, but still operates in the quarter-wave mode.

[0212] In this case, the current density on the second radiator 420 is dispersed, and the electric field density between the second radiator 420 and the floor 300 is weakened, thereby reducing the conductor loss and dielectric loss of the second radiator 420 and the conductors and dielectrics arranged around the second radiator 420, and further improving the radiation characteristics of the second antenna 402. The second radiator 420 increases the radiation aperture, effectively improving the system efficiency and radiation efficiency of the second antenna 402.

[0213] The dielectric wavelength corresponding to the third resonance generated by the second radiator 420 can be understood as the dielectric wavelength corresponding to the resonance point frequency of the third resonance, or can also be understood as the dielectric wavelength corresponding to the center frequency of the resonance frequency band formed by the third resonance. Since there is a certain correspondence between the vacuum wavelength and the dielectric wavelength, the above ratio can be converted to the vacuum wavelength. The wavelengths described in the embodiments of the present application can be understood accordingly, and will not be described one by one for the sake of brevity.

[0214] In an embodiment, the electrical length of the first radiator 410 is about three-quarters of the second wavelength. The second wavelength is the dielectric wavelength corresponding to the second resonance generated by the first radiator 410.

[0215] It should be understood that the second resonance generated by the first radiator 410 can correspond to a three-quarter wavelength mode.

[0216] In one embodiment, the electrical length of the first radiator 410 is about one quarter of a third wavelength. The third wavelength is a dielectric wavelength corresponding to a first resonance generated by the first radiator 410.

[0217] It should be understood that the first resonance generated by the first radiator 410 can correspond to a quarter wavelength mode.

[0218] In one embodiment, the first switch branch 451 has an equivalent impedance of 0 ohm. In one embodiment, the first switch branch 451 includes a 0 ohm resistor. In one embodiment, the first switch branch 451 has an equivalent inductance value less than or equal to 2 nH.

[0219] It should be understood that the first switch branch 451 is coupled between the first connection point 431 and the second connection point 432 through the first switch 441. The first switch branch 451 can approximately short circuit between the first connection point 431 and the second connection point 432, so that the current generated by the first radiator 410 at the second resonance includes a current zero point.

[0220] In one embodiment, the first antenna 401 further includes a second switch branch 452. The second switch branch 452 is coupled between the first connection point 431 and the second connection point 432 through the first switch 441. In one embodiment, the second switch branch 452 is coupled between the first connection point 431 and the second connection point 432, and the second connection port of the first switch 441 is coupled to the second switch branch 452. The second connection port of the first switch 441 is coupled to the second switch branch 452.

[0221] For ease of understanding, the first switch branch 451 and the second switch branch 452 can be regarded as being arranged in parallel. In one embodiment, the first switch branch 451 and the second switch branch 452 are in parallel between the first connection point 431 and the second connection point 432. In one embodiment, the first switch branch 451 and the second switch branch 452 are both in parallel between the first connection point 431 and the second connection point 432 through the first switch 441.

[0222] It should be understood that the first radiator 410 and the second switch branch 452 are used to generate a fourth resonance. The resonance frequency band of the fourth resonance includes a third frequency band, which is different from the first frequency band and the second frequency band. In an embodiment, the third frequency band is not adjacent to the second frequency band (the frequency difference between the center frequency of the third frequency band and the center frequency of the second frequency band is greater than 100 MHz). In an embodiment, the frequency difference between the center frequency of the third frequency band and the center frequency of the second frequency band is greater than 300 MHz. In an embodiment, the frequency difference between the center frequency of the third frequency band and the center frequency of the second frequency band is greater than one-tenth of the center frequency of the third frequency band, or one-tenth of the center frequency of the second frequency band. In an embodiment, the frequency difference between the center frequency of the third frequency band and the center frequency of the second frequency band is greater than fifteen percent of the center frequency of the third frequency band, or fifteen percent of the center frequency of the second frequency band. In an embodiment, the center frequency f3 of the third frequency band and the center frequency f2 of the second frequency band satisfy: f2≤0.9×f3, or f2≥1.1×f3. In an embodiment, the center frequency f3 of the third frequency band and the center frequency f2 of the second frequency band satisfy: f2≤0.85×f3, or f2≥1.15×f3.

[0223] The second switch branch 452 is coupled between the first connection point 431 and the second connection point 432 through the first switch 441, and the first connection point 431 and the second connection point 432 are not equivalent to a short circuit. The second insulating gap of the first radiator 410 can be regarded as an equivalent capacitor (for example, a distributed capacitor) provided on the first radiator 410, which can make the first radiator 410 form a metamaterial structure. The first radiator 410 with the metamaterial structure can increase the radiation aperture, and the electric field is more dispersed after the second insulating gap. In an embodiment, the dielectric loss near the first radiator 410 forming the metamaterial structure is reduced, so that the radiation characteristics (for example, system efficiency and radiation efficiency) of the first antenna 401 can be effectively improved.

[0224] The second switch branch 452 is coupled between the first connection point 431 and the second connection point 432 through the first switch 441, and the second switch branch 452 can be used to adjust the equivalent capacitance value of the second insulating gap, so as to adjust the radiation characteristics (for example, the resonance point frequency of the fourth resonance generated by the first radiator 410) of the first antenna 401.

[0225] In an embodiment, the electrical length of the first radiator 410 is greater than three-eighths of the fourth wavelength. The fourth wavelength is the dielectric wavelength corresponding to the fourth resonance generated by the first radiator 410.

[0226] It should be understood that the fourth resonance generated by the first radiator 410 can correspond to a quarter wavelength mode, and the electrical length of the first radiator 410 can be made greater than three-eighths of the fourth wavelength by the second insulating gap, and the current on the first radiator 410 is co-directional (e.g., does not reverse, and does not include a current zero point). The electrical length of the first radiator 410 is increased from one-quarter of the fourth wavelength to more than three-eighths of the fourth wavelength, but still operates in the quarter wavelength mode.

[0227] In this case, the current density on the first radiator 410 is dispersed, and the electric field density between the first radiator 410 and the floor 300 is weakened, thereby reducing the conductor loss and dielectric loss caused by the first radiator 410 and the conductors and dielectric arranged around the first radiator 410, and thus improving the radiation characteristics of the first antenna 401. The first radiator 410 increases the radiation aperture, effectively improving the system efficiency and radiation efficiency of the first antenna 401.

[0228] In one embodiment, the length of the first radiator 410 between the first end (grounded end, one end at the third position 213) of the first radiator 410 and the second insulating gap is less than the length of the first radiator 410 between the second end (open end, one end at the first position 211) of the first radiator 410 and the second insulating gap.

[0229] It should be understood that the length of the first radiator 410 between the first end (grounded end, one end at the third position 213) of the first radiator 410 and the second insulating gap can be understood as the length of the conductor portion between the end of the end and the second insulating gap. For the sake of brevity of the discussion, it can be understood accordingly in the embodiments of the present application.

[0230] In one embodiment, the length of the first radiator 410 between the first end (grounded end, one end at the third position 213) of the first radiator 410 and the second insulating gap is less than three-fifths of the length of the first radiator 410 between the second end (open end, one end at the first position 211) of the first radiator 410 and the second insulating gap.

[0231] In one embodiment, the length of the first radiator 410 between the first end (grounded end, one end at the third position 213) of the first radiator 410 and the second insulating gap is less than one-third of the length of the first radiator 410 between the second end (open end, one end at the first position 211) of the first radiator 410 and the second insulating gap.

[0232] In one embodiment, the length of the first radiator 410 between the first end (grounded end, one end at the third position 213) of the first radiator 410 and the second insulating gap is less than one seventh of the length of the first radiator 410 between the second end (open end, one end at the first position 211) of the first radiator 410 and the second insulating gap.

[0233] It should be understood that the second insulating gap can be located at a region of the first radiator 410 with a relatively large current. The region with a relatively large current should be understood as, for the unslit first radiator 410 (e.g., operating in a quarter wavelength mode), when the second insulating gap is present, the electric field intensity of the first radiator 410 is weakened, achieving the effect of dispersing the electric field, thereby improving the radiation characteristics (e.g., system efficiency and radiation efficiency) of the first antenna 401.

[0234] In one embodiment, the second switch branch 452 can be a capacitor or an element equivalent to a capacitor, for example, a distributed capacitor.

[0235] In one embodiment, the equivalent capacitance value of the second switch branch 452 can be less than or equal to a first threshold value. The first threshold value can be designed according to the resonant point frequency of the fourth resonance generated by the first radiator 410 (or the center frequency of the third frequency band). When the resonant point frequency of the fourth resonance is less than or equal to 1 GHz, the first threshold value is 10 pF. When the resonant point frequency of the third resonance is greater than 1 GHz, the first threshold value is 2 pF.

[0236] In one embodiment, the second switch branch 452 can be an inductor or an element equivalent to an inductor.

[0237] In one embodiment, the equivalent inductance value of the second switch branch 452 can be less than or equal to 5 nH.

[0238] It should be understood that designing the equivalent capacitance value or the equivalent inductance value of the second switch branch 452 according to the frequency of the resonant point of different resonances can make the current distribution on the first radiator 410 more dispersed, reduce conductor loss, increase the radiation aperture of the first radiator 410, and thereby improve the radiation characteristics (e.g., system efficiency and radiation efficiency) of the first antenna 401.

[0239] In one embodiment, the distance between the first connection point 431 and / or the second connection point 432 and the second insulating gap is less than or equal to 5 mm.

[0240] The distance between the first connection point 431 and / or the second connection point 432 and the second insulating gap can be understood as the minimum distance between the first connection point 431 and / or the second connection point 432 and the conductors on both sides of the second insulating gap (the length of the first radiator 410 between the first connection point 431 and / or the second connection point 432 and the second insulating gap). When the first connection point 431 and / or the second connection point 432 is electrically connected to the ground plate 300 through a connecting piece (for example, a metal spring), the distance between the first connection point 431 and / or the second connection point 432 and the second insulating gap can be understood as the minimum distance between the center of the part of the connecting piece in contact with the connection point and the conductors on both sides of the second insulating gap.

[0241] It should be understood that, for the sake of brevity of the discussion, when the radiator forms a metamaterial structure, the relevant electrical parameters can be understood accordingly, for example, the relative positions of the third connection point 433 and the fourth connection point 434 and the fourth insulating gap in the following embodiments can also be understood accordingly, and for the sake of brevity of the above, they will not be described one by one.

[0242] In one embodiment, the second radiator 420 can further include a third connection point 433 and a fourth connection point 434, and a fourth insulating gap is located between the third connection point 433 and the fourth connection point 434. In one embodiment, the third connection point 433 is located between the fourth position 214 and the fifth position 215, and the fourth connection point 434 is located between the fifth position 215 and the sixth position 216.

[0243] In one embodiment, the second antenna 402 further includes a second switch 442 and a third switch branch 453. In one embodiment, the first connection port of the second switch 442 is coupled with the third switch branch 453.

[0244] In one embodiment, the third switch branch 453 is coupled between the third connection point 433 and the fourth connection point 434 through the second switch 442, as shown in FIG. 12. In one embodiment, the second switch 442 and the third switch branch 453 are coupled between the third connection point 433 and the fourth connection point 434.

[0245] In one embodiment, the third switch branch 453 is coupled between the third connection point 433 or the fourth connection point 434 and the ground plate 300 through the second switch 442, as shown in FIG. 13. In one embodiment, the second switch 442 and the third switch branch 453 are coupled between the third connection point 433 or the fourth connection point 434 and the ground plate 300.

[0246] It should be understood that by coupling the third switch branch 453 between the third connection point 433 and the fourth connection point 434 (or between the third connection point 433 or the fourth connection point 434 and the floor 300), the equivalent capacitance value of the fourth insulating gap can be adjusted, so as to adjust the radiation characteristics (for example, the resonant point frequency of the third resonance generated by the second radiator 420) of the second antenna 402.

[0247] In an embodiment, the second radiator 420 and the third switch branch 453 are used to generate the third resonance described above.

[0248] In an embodiment, the second antenna 402 can further include a fourth switch branch 454. In an embodiment, the second connection port of the second switch 442 is coupled with the fourth switch branch 454. The fourth switch branch 454 and the third switch branch 453 can be seen as being arranged in parallel. In an embodiment, the fourth switch branch 454 and the third switch branch 453 are coupled in parallel between the third connection point 433 and the fourth connection point 434 (or between the third connection point 433 or the fourth connection point 434 and the floor 300) through the second switch 442.

[0249] It should be understood that by switching the third switch branch 453 and the fourth switch branch 454 through the second switch 442, the equivalent capacitance value of the fourth insulating gap can be adjusted, so as to adjust the radiation characteristics (for example, the resonant point frequency of the third resonance generated by the second radiator 420) of the second antenna 402.

[0250] In an embodiment, the first insulating gap and the third insulating gap are aligned, and / or the second insulating gap and the fourth insulating gap are aligned, so as to improve the aesthetic level of the electronic device 100.

[0251] It should be understood that in the embodiments of the present application, alignment can be understood as that when the electronic device 100 is in the closed state, the two insulating gaps at least partially overlap in the thickness direction of the electronic device 100.

[0252] FIG. 14 is a simulation result of S parameters of the first antenna and the second antenna in the electronic device 100 shown in FIG. 13.

[0253] It should be understood that for the sake of brevity of the discussion, in the simulation result shown in FIG. 14, only the first frequency band including B41 (2.496GHz-2.69GHz) in LTE and the second frequency band including the 2.4G frequency band (2.4GHz-2.4835GHz) in Wi-Fi are taken as examples for illustration.

[0254] As shown in FIG. 14, the first antenna (S11) and the second antenna (S22) both resonate near 2.4 GHz, which can correspond to the second resonance and the third resonance in the above-described embodiments. The resonant frequency band of the second resonance includes B41 (2.496 GHz-2.69 GHz), and the resonant frequency band of the third resonance includes the 2.4 G frequency band (2.4 GHz-2.4835 GHz).

[0255] In the above-described frequency band, the isolation (S12) between the first antenna and the second antenna is greater than 9 dB, which meets the communication requirement.

[0256] FIG. 15 is a schematic diagram of another electronic device 100 provided by an embodiment of the present application.

[0257] As shown in FIG. 15, the first radiator 410 includes a fifth connection point 435. The fifth connection point 435 is located between the second connection point 432 and the third position 213.

[0258] The first antenna 401 further includes a third switch 443 and a fifth switch branch 455. The third switch 443 and the fifth switch branch 455 are coupled between the fifth connection point 435 and the ground plane 300. The first connection port of the third switch 443 is coupled with the fifth switch branch 455.

[0259] It should be understood that the electronic device 100 shown in FIG. 15 is different from the electronic device 100 shown in FIGS. 10-13 only in the third switch 443 and the fifth switch branch 455.

[0260] In the electronic device 100 shown in FIG. 15, the fifth switch branch 455 is coupled between the fifth connection point 435 and the ground plane 300 through the third switch 443. Part of the current on the first radiator 410 is transmitted to the ground plane 300 through the fifth switch branch 455, and the intensity of the current on the first radiator 410 between the fifth connection point 435 and the third position 213 is reduced. When the first radiator 410 generates the second resonance (for example, at the resonance point of the second resonance), due to the reduction of the intensity of the current on the first radiator 410 between the fifth connection point 435 and the third position 213, a reverse current appears in the current on the second radiator 420 generated by the coupling of the first radiator 410, so that the current distribution on the second radiator 420 generated by the coupling of the first radiator 410 is similar to the current distribution generated by the line CM mode. On the second radiator 420, the current distribution generated by the third resonance is similar to the current distribution generated by the line DM mode, and the current distribution generated by the coupling of the first radiator 410 is similar to the current distribution generated by the line CM mode. Since the isolation between the line CM mode and the line DM mode is good, the interference between the current distributed on the first radiator 410 and the second radiator 420 similar to the line CM mode and the current distributed similar to the line DM mode is small, and the first antenna 401 and the second antenna 402 have good isolation.

[0261] In an embodiment, the first radiator 410 and the fifth switch branch 455 are used to generate the second resonance.

[0262] In an embodiment, the first radiator 410, the first switch branch 451 and the fifth switch branch 455 are used to generate the second resonance.

[0263] It should be understood that in the electronic device 100 shown in FIGS. 10-13, the first switch branch 451 is coupled between the first connection point 431 and the second connection point 432, and the current distribution on the second radiator 420 generated by the coupling of the first radiator 410 is similar to the current distribution generated by the line CM mode. In the electronic device 100 shown in FIG. 15, the fifth switch branch 455 is coupled between the fifth connection point 435 and the ground plane 300, and the current distribution on the second radiator 420 generated by the coupling of the first radiator 410 can also be similar to the current distribution generated by the line CM mode. Therefore, the first antenna 401 and the second antenna 402 can also have better isolation through the first switch branch 451 and the fifth switch branch 455.

[0264] In an embodiment, the equivalent impedance of the fifth switch branch 455 is 0 ohm. In an embodiment, the fifth switch branch 455 includes a 0 ohm resistor. In an embodiment, the equivalent inductance value of the fifth switch branch 455 is less than or equal to 2 nH.

[0265] It is appreciated that the fifth switch branch 455 is coupled between the fifth connection point 435 and the ground plane 300 through the third switch 443, and the fifth switch branch 455 can cause an approximate short circuit between the fifth connection point 435 and the ground plane 300. More current on the first radiator 410 is transmitted to the ground plane 300 through the fifth switch branch 455, and the intensity of the current on the first radiator 410 between the fifth connection point 435 and the third position 213 is reduced. Therefore, the intensity of the reverse current in the current on the second radiator 420 generated by the coupling of the first radiator 410 is increased, and the current distribution is more similar to the current distribution generated by the line CM mode in the above-mentioned embodiment, and the isolation between the first antenna 401 and the second antenna 402 is better.

[0266] In one embodiment, the first antenna 401 further includes a sixth switch branch 456. The sixth switch branch 456 is coupled between the fifth connection point 435 and the ground plane 300 through the third switch 443, and the second connection port of the third switch 443 is coupled with the sixth switch branch 456. For ease of understanding, the fifth switch branch 455 and the sixth switch branch 456 can be regarded as being arranged in parallel.

[0267] It is appreciated that the first radiator 410 is electrically connected with the ground plane 300 at the fifth connection point 435 through the sixth switch branch 456, and when the first radiator 410 resonates, the current on the first radiator 410 is shunted in the area near the fifth connection point 435. Due to the shunting in the area near the fifth connection point 435, the current density on the first radiator 410 can be dispersed. In one embodiment, the current distribution on the first radiator 410 is relatively more dispersed, thereby reducing the conductor loss of the first radiator 410. In one embodiment, the current distribution on the first radiator 410 is relatively more dispersed, which can increase the radiation aperture of the first radiator 410. Due to the reduced conductor loss and the increased radiation aperture of the first radiator 410, the radiation characteristics (e.g., system efficiency and radiation efficiency) of the first antenna 401 can be improved. In one embodiment, the sixth switch branch 456 can also be used to adjust the resonance point of the resonance generated by the first radiator 410.

[0268] In one embodiment, the distance between the fifth connection point 435 and the second connection point 432 (e.g., the length of the first radiator 410 between the fifth connection point 435 and the second connection point 432) is greater than or equal to 0 mm and less than or equal to 5 mm.

[0269] It should be understood that, since the first switch branch 451 and the fifth switch branch 455 can both cause a reverse current to appear in the current on the second radiator 420 coupled by the first radiator 410, when the first antenna 401 only includes one of the first switch branch 451 and the fifth switch branch 455, or the first radiator 410 is only coupled with one of the first switch branch 451 and the fifth switch branch 455 when generating the second resonance, the first antenna 401 and the second antenna 402 still have good isolation. In this case, the first radiator 410 can be coupled with the second switch branch 452 or the sixth switch branch 456, so as to adjust the radiation characteristics of the first antenna 401.

[0270] For the sake of brevity of the discussion, the electronic device 100 shown in FIG. 15 has similar parts to the first antenna 401 and the second antenna 402 shown in the electronic device 100 shown in FIGS. 10-13, such as the position and structure of the first radiator 410, the position and structure of the second radiator 420, the positional relationship between the first radiator 410 and the second radiator 420, the resonance generated by the first radiator 410, the resonance generated by the second radiator 420, the relationship between the first frequency band and the second frequency band, the positions of the respective connection points on the first radiator 410 and the second radiator 420, and the like.

[0271] FIG. 16 is a schematic diagram of another electronic device 100 according to an embodiment of the present application.

[0272] As shown in FIG. 16, the first bezel 210 further includes a seventh position 217. The first position 211 is located between the seventh position 217 and the second position 212. The first bezel 210 includes the seventh position 217, the first position 211, the second position 212, and the third position 213 arranged in sequence.

[0273] The first antenna 401 includes a parasitic branch 430. The parasitic branch 430 includes a conductive portion of the first bezel 210 between the first position 211 and the seventh position 217. At least a portion of the parasitic branch 430 is spaced apart from the ground plane 300.

[0274] It should be understood that the electronic device 100 shown in FIG. 16 differs from the electronic devices 100 shown in FIGS. 10-13 and FIG. 15 only in the parasitic branch 430. In the electronic device 100 shown in FIG. 16, the parasitic branch 430 can be used to generate a parasitic resonance to improve the radiation characteristics (e.g., operating bandwidth) of the first antenna 401.

[0275] In one embodiment, the resonant point frequency of the parasitic resonance is higher than the resonant point frequency of the second resonance. In one embodiment, the frequency difference between the resonant point frequency of the parasitic resonance and the resonant point frequency of the second resonance is greater than or equal to 200 MHz. In one embodiment, the frequency difference between the resonant point frequency of the parasitic resonance and the resonant point frequency of the second resonance is less than or equal to 600 MHz.

[0276] It should be appreciated that when the resonant point frequency of the parasitic resonance is higher than the resonant point frequency of the second resonance, the radiation characteristics (e.g., system efficiency and radiation efficiency) of the first antenna 401 at the first frequency band can be improved. When the frequency difference between the resonant point frequency of the parasitic resonance and the resonant point frequency of the second resonance is greater than or equal to 200 MHz, less than or equal to 600 MHz, the first antenna 401 has a wider operating bandwidth.

[0277] In one embodiment, the first antenna 401 further comprises a fourth switch 444 and a seventh switch branch 457. The parasitic stub 430 comprises a sixth connection point 436. The seventh switch branch 457 is coupled between the sixth connection point 436 and the ground plane 300 through the fourth switch 444. In one embodiment, the fourth switch 444 and the seventh switch branch 457 are coupled between the sixth connection point 436 and the ground plane 300. The first connection port of the fourth switch 444 is coupled with the seventh switch branch 457.

[0278] In one embodiment, the parasitic stub 430 and the seventh switch branch 457 can be used to generate the parasitic resonance described above.

[0279] It should be appreciated that the seventh switch branch 457 can be used to adjust the current distribution on the parasitic stub 430. In one embodiment, when the first radiator 410 generates the second resonance (e.g., at the resonant point of the second resonance), the currents on the first radiator 410 at both sides of the first insulating gap (the first position 211) and the current on the parasitic stub 430 are in opposite directions. When the second radiator 420 generates the third resonance (e.g., at the resonant point of the third resonance), the currents on the first radiator 410 at both sides of the first insulating gap (the first position 211) and the current on the parasitic stub 430 are in the same direction.

[0280] When the first antenna 401 comprises the parasitic stub, the first radiator 410 generates the second resonance and the second radiator generates the third resonance at both sides of the first insulating gap (the first position 211), respectively, also have similar current distributions of the line CM mode and the line DM mode in the above-described embodiments, and thus, the first antenna 401 and the second antenna 402 have better isolation.

[0281] Meanwhile, when the third resonance is generated by the second radiator 420 (for example, at the resonance point of the third resonance), a current is also coupled on the parasitic branch 430, which can weaken the intensity of the current coupled on the first radiator 410, further reduce the coupling between the first radiator 410 and the second radiator 420, and improve the isolation between the first antenna 401 and the second antenna 402.

[0282] In an embodiment, the first frame 210 is coupled with the floor 300 at the seventh position 217.

[0283] It should be understood that, in the embodiments of the present application, only the case that one end of the parasitic branch 430 is an open end and the other end is a grounded end is taken as an example for illustration, and in actual production or design, the first frame 210 can also have an insulating gap at the seventh position 217, and both ends of the parasitic branch 430 are open ends, which is not limited in the embodiments of the present application.

[0284] In an embodiment, the sixth connection point 436 is close to the first position 211. In an embodiment, the length of the parasitic branch 430 between the sixth connection point 436 and the first position 211 (the length of the first frame 210 between the sixth connection point 436 and the first position 211) is less than or equal to 5 mm.

[0285] It should be understood that the region near the open end of the parasitic branch 430 has a stronger electric field, and when the sixth connection point 436 is close to the open end, the seventh switch branch 457 has a larger adjustment space.

[0286] In an embodiment, the first antenna 401 further includes an eighth switch branch 458. The eighth switch branch 458 is coupled between the sixth connection point 436 and the floor 300 through the fourth switch 444. In an embodiment, the second connection port of the fourth switch 444 is coupled with the eighth switch branch 458. For ease of understanding, the seventh switch branch 457 and the eighth switch branch 458 can be regarded as being arranged in parallel.

[0287] It should be understood that the first antenna 401 can switch the switch branch coupled with the sixth connection point 436 through the fourth switch 444 to adjust the radiation characteristics of the parasitic branch 430.

[0288] For the sake of brevity of discussion, similar parts of the electronic device 100 shown in FIG. 16 to the first antenna 401 and the second antenna 402 shown in FIGS. 10-13 and FIG. 15 will not be described again, for example, the similar parts include: the position and structure of the first radiator 410; the position and structure of the second radiator 420; the positional relationship between the first radiator 410 and the second radiator 420; the resonance generated by the first radiator 410; the resonance generated by the second radiator 420; the relationship between the first frequency band and the second frequency band; the position of each connection point on the first radiator 410 and the second radiator 420; and the like.

[0289] FIG. 17 is a simulation result of S parameters of the first antenna and the second antenna in the electronic device 100 shown in FIG. 16.

[0290] It should be understood that, for the sake of brevity of discussion, in the simulation result shown in FIG. 17, only the first frequency band including B41 (2.496GHz-2.69GHz) in LTE and the second frequency band including the 2.4G frequency band (2.4GHz-2.4835GHz) in Wi-Fi are taken as examples for illustration.

[0291] As shown in FIG. 17, the first antenna (S11) generates resonance near 2.1GHz, near 2.4GHz and near 2.8GHz. Among them, the resonance generated near 2.4GHz corresponds to the second resonance in the above embodiment. The resonance generated near 2.8GHz corresponds to the parasitic resonance in the above embodiment. The resonance generated near 2.1GHz corresponds to the resonance generated by the quarter mode of the first radiator.

[0292] The second antenna (S22) generates resonance near 2.4GHz, which can correspond to the third resonance in the above embodiment.

[0293] The resonance frequency band of the second resonance includes B41 (2.496GHz-2.69GHz), and the resonance frequency band of the third resonance includes the 2.4G frequency band (2.4GHz-2.4835GHz).

[0294] In the first frequency band and the second frequency band, the isolation (S12) between the first antenna and the second antenna is greater than 11dB, which meets the communication requirement.

[0295] FIGS. 18 and 19 are current distribution diagrams of the first antenna and the second antenna in the electronic device 100 shown in FIG. 16. Among them, FIG. 18 is a current distribution diagram corresponding to the resonance of the first antenna in the electronic device 100 shown in FIG. 16. FIG. 19 is a current distribution diagram corresponding to the resonance of the second antenna in the electronic device 100 shown in FIG. 16.

[0296] As shown in FIG. 18, when the first radiator 410 generates the second resonance (for example, at the resonance point of the second resonance) in the closed state of the electronic device 100, because the current generated on the first radiator 410 includes a current zero point, the currents on both sides of the current zero point are reversed, and the current distribution on the first radiator 410 is similar to the current distribution generated in the line CM mode in the above-described embodiment. At the resonance point of the second resonance, the current generated on the second radiator 420 by the coupling of the first radiator 410 also includes a partial reverse current, and the current distribution on the second radiator 420 is similar to the current distribution generated in the line CM mode in the above-described embodiment.

[0297] Also, when the first radiator 410 generates the second resonance (for example, at the resonance point of the second resonance), the currents on the first radiator 410 on both sides of the first insulating gap (the first position 211) and the currents on the parasitic branch 430 are reversed.

[0298] As shown in FIG. 19, when the second radiator 420 generates the third resonance (for example, at the resonance point of the third resonance) in the closed state of the electronic device 100, because the current generated on the second radiator 420 is in the same direction, does not include a current zero point, and the current distribution on the second radiator 420 is similar to the current distribution generated in the line DM mode in the above-described embodiment. At the resonance point of the third resonance, the current generated on the first radiator 410 by the coupling of the second radiator 420 is mostly in the same direction, and the current distribution on the first radiator 410 is similar to the current distribution generated in the line DM mode in the above-described embodiment.

[0299] Also, when the second radiator 420 generates the third resonance (for example, at the resonance point of the third resonance), the currents on the first radiator 410 on both sides of the first insulating gap (the first position 211) generated by the coupling of the second radiator 420 and the currents on the parasitic branch 430 generated by the coupling of the second radiator 420 are in the same direction.

[0300] The above describes only a specific implementation of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can easily think of changes or replacements within the technical range disclosed in the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. An electronic device, characterized in that, include: A first housing, a second housing, and a floor, wherein the first housing and the second housing are configured to be folded relative to each other into a closed state for the electronic device; The first housing includes a first frame, and the second housing includes a second frame; The first frame includes a first position, a second position, and a third position arranged sequentially. The first frame has a first insulating gap and a second insulating gap at the first position and the second position, respectively. The first frame is coupled to the floor at the third position. The second frame includes a fourth position, a fifth position, and a sixth position arranged sequentially. The second frame has a third insulating gap and a fourth insulating gap at the fourth position and the fifth position, respectively. The second frame is coupled to the floor at the fifth position. A first antenna, the first antenna comprising: A first radiator, comprising a conductive portion of the first frame between the first position and the third position, wherein at least a portion of the first radiator is spaced apart from the floor. A first feed circuit, the first radiator including a first feed point, the first feed circuit coupled to the first feed point to feed in a radio frequency signal of a first frequency band, and The first switch and the first switch branch, the first radiator includes a first connection point and a second connection point, the second insulating gap is located between the first connection point and the second connection point, and the first switch branch is coupled to the first connection point and the second connection point through the first switch; A second antenna, the second antenna comprising: A second radiator, comprising a conductive portion of the second frame between the fourth and sixth positions, wherein at least a portion of the second radiator is spaced apart from the floor, and The second antenna further includes a second feeding circuit, the second radiator includes a second feeding point, and the second feeding circuit is coupled to the second feeding point to feed in a radio frequency signal of the second frequency band; Wherein, based on the electronic device being in a closed state, the first radiator and the second radiator at least partially overlap along a first direction, the first direction being the thickness direction of the electronic device, and the distance between the first position and the fourth position is less than the distance between the first position and the sixth position, and the distance between the third position and the fourth position is greater than the distance between the third position and the sixth position; Wherein, based on the electronic device being in a closed state, the first radiator and the first switch branch are used to generate a first resonance and a second resonance, the resonant frequency of the first resonance is less than the resonant frequency of the second resonance, the resonant frequency band of the second resonance includes a first frequency band, the second radiator is used to generate a third resonance, the resonant frequency band of the third resonance includes a second frequency band, and the center frequency f1 of the first frequency band and the center frequency f2 of the second frequency band satisfy: 0.85×f1≤f2≤1.15×f1.

2. The electronic device according to claim 1, characterized in that, At the resonant point of the second resonance, the current on the first radiator includes a current zero point; At the resonant point of the third resonance, the currents on the second radiator are in the same direction.

3. The electronic device according to claim 1 or 2, characterized in that, Assuming the electronic device is in a closed state, the ratio between the length L' of the overlapping portion of the projection of the first radiator on the second frame and the length L2 of the second radiator satisfies: (L' / L2)≥0.

5.

4. The electronic device according to any one of claims 1 to 3, characterized in that, At the resonant point of the second resonance, the current generated on the second radiator by coupling with the first radiator includes a current zero point.

5. The electronic device according to any one of claims 1 to 4, characterized in that, The first switching branch includes a 0-ohm resistor, or the equivalent inductance of the first switching branch is less than or equal to 2nH.

6. The electronic device according to any one of claims 1 to 5, characterized in that, The first antenna further includes a second switch branch, which is coupled between the first connection point and the second connection point through the first switch.

7. The electronic device according to claim 6, characterized in that, The first radiator and the second switch branch are used to generate a fourth resonance, the resonant frequency band of which includes a third frequency band, and the third frequency band is different from both the first and second frequency bands.

8. The electronic device according to claim 7, characterized in that, At the resonant point of the fourth resonance, the currents on the first radiator are in the same direction.

9. The electronic device according to any one of claims 1 to 8, characterized in that, The distance between the first connection point and / or the second connection point and the second insulation gap is less than or equal to 5 mm.

10. The electronic device according to any one of claims 1 to 9, characterized in that, The second radiator includes a third connection point and a fourth connection point, and the fourth insulating gap is located between the third connection point and the fourth connection point; The second antenna also includes a second switch and a third switch branch. The third switch branch is coupled between the third connection point and the fourth connection point through the second switch, or the third switch branch is coupled between the third connection point and the floor through the second switch.

11. The electronic device according to claim 10, characterized in that, The second radiator and the third switch branch are used to generate the third resonance.

12. The electronic device according to claim 10 or 11, characterized in that, The distance between the third connection point and / or the fourth connection point and the fourth insulating gap is less than or equal to 5 mm.

13. The electronic device according to any one of claims 1 to 12, characterized in that, The first connection point is located between the first position and the second position, and the second connection point is located between the second position and the third position; The first radiator includes a fifth connection point, which is located between the second connection point and the third position; The first antenna also includes a third switch and a fourth switch branch, wherein the fourth switch branch is coupled between the fifth connection point and the floor through the third switch.

14. The electronic device according to any one of claims 1 to 13, characterized in that, The first border also includes a seventh position, the first position being located between the seventh position and the second position; The first antenna includes a parasitic branch, the parasitic branch including a conductive portion of the first frame between the first position and the seventh position, and at least a portion of the parasitic branch is spaced apart from the ground. The parasitic stalk can be used to generate parasitic resonance, and the resonant frequency of the parasitic resonance is higher than the resonant frequency of the second resonance.

15. The electronic device according to claim 14, characterized in that, The parasitic branch includes a sixth connection point; The first antenna also includes a fourth switch and a fifth switch branch, wherein the fifth switch branch is coupled between the sixth connection point and the ground through the fourth switch.

16. The electronic device according to claim 14 or 15, characterized in that, At the resonance point of the second resonance, the current on the first radiator on both sides of the first insulating gap and the current on the parasitic branch are in opposite directions. At the resonant point of the third resonance, the current generated by the coupling of the second radiator on the first radiator on both sides of the first insulating gap and the current generated by the coupling of the second radiator on the parasitic branch are in the same direction.

17. The electronic device according to any one of claims 1 to 16, characterized in that, The first insulating gap and the third insulating gap are aligned, and / or the second insulating gap and the fourth insulating gap are aligned.

18. The electronic device according to any one of claims 1 to 17, characterized in that, Since the electronic device is in a closed state, the ratio between the length L' of the overlapping portion of the projection of the first radiator on the second frame and the second radiator and the length L1 of the first radiator satisfies: (L' / L1) = 1.

19. The electronic device according to any one of claims 1 to 18, characterized in that, The electronic device also includes a third housing, a first rotating shaft, and a second rotating shaft; The first rotating shaft is located between the first housing and the second housing, and the first rotating shaft is rotatably connected to both the first housing and the second housing. The second rotating shaft is located between the third housing and the second housing, and the second rotating shaft is rotatably connected to both the third housing and the second housing.

Images