An electronic device

Abstract

Embodiments of the present application provide an electronic device, which includes an antenna using a part of a conductive frame as a radiator, and can produce multiple resonance frequency bands while reducing the opening of the frame gap, so as to meet the communication needs of the electronic device. The electronic device includes a ground plate, a conductive frame and an antenna. The frame has a first position and a second position, the frame is grounded at the first position, the second position is provided with a gap, and the first frame between the first position and the second position serves as a radiator of the antenna. The first frame includes a first grounding point, a first feeding point and a second feeding point, the first feeding point is located between the first grounding point and the first position, the second feeding point is located between the first grounding point and the second position, and the length L1 of the frame between the first position and the first grounding point and the length L2 of the frame between the second position and the first grounding point satisfy: 1.8≤L1 / L2≤2.2.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of wireless communication, in particular to an electronic device. BACKGROUND

[0002] Among many technologies for improving wireless transmission characteristics, a multiple-input multiple-output (MIMO) system is a core technology widely adopted. The MIMO system can simultaneously have spatial diversity and spatial multiplexing, and can improve the spectral efficiency of a communication system, effectively improve the channel capacity, and greatly improve the download and upload rates of users by using the spatial degrees of freedom provided by multiple antennas arranged at the transmitting end and the receiving end. The multi-antenna architecture (2x2) of the MIMO system of the fifth generation (5G) New Radio (NR) or the multi-antenna architecture (4x4 or 8x8) of the MIMO system of wireless fidelity (WiFi) 6 / 7 will be the trend of future communication applications.

[0003] Currently, in the implementation of the multi-antenna architecture of the long term evolution (LTE) / 5G NR MIMO in electronic devices, the placement and planning of multiple antenna units, and the use of the conductive frame in the electronic device as the radiator of the antenna unit are relatively suitable design integration solutions. SUMMARY

[0004] Embodiments of the present application provide an electronic device including an antenna that uses part of a conductive frame as a radiator. The electronic device can produce multiple resonance frequency bands while reducing the opening of the frame gap, thereby meeting the communication needs of the electronic device.

[0005] In a first aspect, an electronic device is provided, comprising: a floor; a conductive frame, the frame having a first position and a second position, the frame being grounded at the first position, the second position being provided with a gap, the frame between the first position and the second position being a first frame; an antenna comprising the first frame, the first frame comprising a first grounding point, a first feed point and a second feed point, the first feed point being located between the first grounding point and the first position, the second feed point being located between the first grounding point and the second position; wherein the antenna further comprises a first capacitor, a second capacitor, a first feed unit and a second feed unit, a first end of the first capacitor being electrically connected to the first frame at the first feed point, a second end of the first capacitor being electrically connected to the first feed unit, a first end of the second capacitor being electrically connected to the first frame at the second feed point, a second end of the second capacitor being electrically connected to the second feed unit; a length L1 of the first frame between the first position and the first grounding point and a length L2 of the first frame between the second position and the first grounding point satisfy: 1.8≤L1 / L2≤2.2.

[0006] According to the technical scheme of the embodiments of the present application, when the first feed unit feeds, the antenna can serve as a first antenna unit. When the second feed unit feeds, the antenna can serve as a second antenna unit. The technical scheme provided by the embodiments of the present application forms a dual antenna structure, uses part of the frame of the electronic device as a radiator of the antenna, and only a single gap is formed on the frame, which greatly reduces the complexity of the process manufacturing and reduces the influence on the integrity of the frame. At the same time, each antenna unit in the dual antenna structure can produce dual resonance, which can make it work in two different frequency bands at the same time, meet the communication requirements of the electronic device, and maintain good isolation between the two antenna units.

[0007] In combination with the first aspect, in some implementations of the first aspect, when the first feed unit feeds, the antenna produces a first resonance and a second resonance, a resonance frequency of the first resonance being lower than a resonance frequency of the second resonance; when the second feed unit feeds, the antenna produces a third resonance and a fourth resonance; a resonance frequency band of the first resonance and a resonance frequency band of the third resonance are the same, and a resonance frequency band of the second resonance and a resonance frequency band of the fourth resonance are the same.

[0008] According to the technical scheme of the embodiment of the present application, when the first feeding unit feeds, the antenna can serve as the first antenna unit to generate a first resonance and a second resonance, the resonance frequency of the first resonance being lower than the resonance frequency of the second resonance. The first resonance is generated by the first frame between the first position and the second position, and the second resonance is generated by the first frame between the first position and the first feeding point. Corresponding to the first resonance, the antenna is a linear antenna structure, and the working mode is a three-quarter wavelength mode. Corresponding to the second resonance, the antenna is a closed slot hole structure, and the working mode is a half wavelength mode.

[0009] When the second feeding unit feeds, the antenna can serve as the second antenna unit to generate a third resonance and a fourth resonance, the resonance frequency band of the first resonance being the same as that of the third resonance, and the resonance frequency band of the second resonance being the same as that of the fourth resonance. Therefore, the antenna can be applied to a MIMO system. The third resonance is generated by the first frame between the ground point and the second position, and the fourth resonance is generated by the first frame between the second feeding point and the second position. Corresponding to the third resonance, the antenna is an inverted F antenna structure, and the working mode is a quarter wavelength mode. Corresponding to the fourth resonance, the antenna is an open slot hole structure, and the working mode is a quarter wavelength mode.

[0010] In combination with the first aspect, in some implementations of the first aspect, a frequency ratio of the resonance frequency f1 of the first resonance and the resonance frequency f2 of the second resonance satisfies: 1.1≤f2 / f1≤1.5.

[0011] According to the technical scheme of the embodiment of the present application, in order for the antenna to have good radiation characteristics at high frequencies (the resonance frequency band of the second resonance and the resonance frequency band of the fourth resonance) and low frequencies (the resonance frequency band of the first resonance and the resonance frequency band of the third resonance), the frequency difference between the low frequencies and the high frequencies should be kept within a reasonable range.

[0012] In combination with the first aspect, in some implementations of the first aspect, a capacitance value C1 of the first capacitor satisfies: 0.3pF≤C1≤1pF; and / or, a capacitance value C2 of the second capacitor satisfies: 0.3pF≤C2≤1pF.

[0013] According to the technical scheme of the embodiment of the present application, only the 3300MHz-3800MHz frequency band is taken as an example for description, and in actual application, the capacitance value of the first capacitor and the capacitance value of the second capacitor can be adjusted according to design requirements.

[0014] In combination with the first aspect, in some implementations of the first aspect, the first capacitor comprises at least one of a lumped capacitor device and a distributed capacitor device; and the second capacitor comprises at least one of a lumped capacitor device and a distributed capacitor device.

[0015] With reference to the first aspect, in some implementations of the first aspect, the first capacitor includes a first metal layer and a second metal layer, the first metal layer and the second metal layer are spaced apart along a first direction, and projections of the first metal layer and the second metal layer on a plane in which the floor is located along the first direction at least partially overlap, the first metal layer is electrically connected to the first bezel at a first feeding point, and the second metal layer is electrically connected to the first feeding unit; the second capacitor includes a third metal layer and a fourth metal layer, the third metal layer and the fourth metal layer are spaced apart along the first direction, and projections of the third metal layer and the fourth metal layer on the plane in which the floor is located along the first direction at least partially overlap, the third metal layer is electrically connected to the first bezel at a second feeding point, and the fourth metal layer is electrically connected to the second feeding unit.

[0016] According to the technical solution of the embodiments of the present application, for a distributed capacitor, the capacitance value of the first capacitor or the second capacitor can be adjusted by controlling the electrical parameter of the first capacitor or the electrical parameter of the second capacitor (for example, the relative dielectric constant of the medium filled between the first metal layer and the second metal layer), so as to adjust the radiation characteristics of the antenna.

[0017] With reference to the first aspect, in some implementations of the first aspect, the antenna further includes an inductor, a first end of the inductor is electrically connected to the second metal layer, and a second end of the inductor is electrically connected to the fourth metal layer.

[0018] According to the technical solution of the embodiments of the present application, by arranging an inductor between the first capacitor and the second capacitor, the impedance corresponding to the CM mode and the impedance of the DM mode in the antenna can be adjusted, so as to adjust the isolation degree between the plurality of antenna units.

[0019] With reference to the first aspect, in some implementations of the first aspect, when the first feeding unit feeds, the antenna generates a first resonance and a second resonance, a resonance frequency of the first resonance is lower than a resonance frequency of the second resonance, a length of the first bezel between the first feeding point and the first grounding point is less than or equal to one eighth of a first wavelength, the first wavelength is a wavelength corresponding to the first resonance, and a length of the first bezel between the second feeding point and the first grounding point is less than or equal to one eighth of the first wavelength.

[0020] According to the technical solution of the embodiments of the present application, the positions of the first feeding point and the second feeding point are adjusted, so that when the electrical signal is fed, the antenna can generate a first resonance, a second resonance, a third resonance, and a fourth resonance.

[0021] With reference to the first aspect, in some implementations of the first aspect, the bezel further has a third position and a fourth position, the bezel between the second position and the fourth position is a second bezel, the second bezel includes the first bezel, the third position is between the fourth position and the first position; the bezel is grounded at the third position, and the fourth position is provided with a gap; the antenna includes a second bezel, the bezel between the third position and the fourth position includes a second grounding point, a third feeding point, and a fourth feeding point, the third feeding point is between the second grounding point and the third position, and the fourth feeding point is between the second grounding point and the fourth position.

[0022] According to the technical scheme of the embodiment of the present application, the bezel between the first position and the second position forms a first antenna (the first antenna can include a first antenna unit and a second antenna unit, the first antenna unit when the first feeding unit is fed, and the second antenna unit when the second feeding unit is fed), and the bezel between the third position and the fourth position forms a second antenna (the second antenna can include a third antenna unit and a fourth antenna unit, the third antenna unit when the third feeding unit is fed, and the fourth antenna unit when the fourth feeding unit is fed). The isolation between the first antenna and the second antenna can be adjusted by the design of the bezel between the first position and the third position.

[0023] With reference to the first aspect, in some implementations of the first aspect, when the first feeding unit is fed, the antenna generates a first resonance and a second resonance, the resonance frequency of the first resonance is lower than the resonance frequency of the second resonance; the length of the bezel between the first position and the third position is greater than or equal to one fifth of a first wavelength and less than or equal to one half of the first wavelength, and the first wavelength is a wavelength corresponding to the first resonance.

[0024] According to the technical scheme of the embodiment of the present application, the isolation between the first antenna and the second antenna is improved with the increase of the length of the bezel between the first position and the third position. When the length of the bezel between the first position and the third position is greater than or equal to one half of the first wavelength, an additional resonance can be generated, which can interfere with the antenna and affect the radiation characteristics of the antenna. Therefore, the length of the bezel between the first position and the third position needs to be within a reasonable range, for example, the length of the bezel between the first position and the third position is between one fifth of the first wavelength and one half of the first wavelength.

[0025] In a second aspect, an electronic device is provided, comprising: a floor; a conductive frame having a first position and a second position, the frame being grounded at the first position, the second position providing a gap, the frame between the first position and the second position being a first frame; an antenna comprising the first frame, the first frame comprising a first grounding point, a first feeding point, and a second feeding point, the first feeding point being between the first grounding point and the first position, the second feeding point being between the first grounding point and the second position; wherein the antenna further comprises a first feeding unit and a second feeding unit, the first feeding unit being electrically connected with the first frame at the first feeding point, the second feeding unit being electrically connected with the second frame at the second feeding point; when the first feeding unit is fed, the antenna generates a first resonance and a second resonance, a resonance frequency of the first resonance being lower than a resonance frequency of the second resonance, when the second feeding unit is fed, the antenna generates a third resonance and a fourth resonance, a resonance frequency band of the first resonance being the same as a resonance frequency band of the third resonance, a resonance frequency band of the second resonance being the same as a resonance frequency band of the fourth resonance; a length L1 of the first frame between the first position and the first grounding point and a length L2 of the first frame between the second position and the first grounding point satisfy: 1.8≤L1 / L2≤2.2.

[0026] With reference to the second aspect, in some implementations of the second aspect, the antenna further comprises a first capacitor and a second capacitor; a first end of the first capacitor is electrically connected with the first frame at the first feeding point, a second end of the first capacitor is electrically connected with the first feeding unit; a first end of the second capacitor is electrically connected with the first frame at the second feeding point, a second end of the second capacitor is electrically connected with the second feeding unit.

[0027] With reference to the second aspect, in some implementations of the second aspect, a frequency ratio of the resonance frequency f1 of the first resonance and the resonance frequency f2 of the second resonance satisfies: 1.1≤f2 / f1≤1.5.

[0028] With reference to the second aspect, in some implementations of the second aspect, a capacitance value C1 of the first capacitor satisfies: 0.3pF≤C1≤1pF; and / or, a capacitance value C2 of the second capacitor satisfies: 0.3pF≤C2≤1pF.

[0029] With reference to the second aspect, in some implementations of the second aspect, the first capacitor comprises at least one of a lumped capacitor device and a distributed capacitor device; the second capacitor comprises at least one of a lumped capacitor device and a distributed capacitor device.

[0030] In some embodiments of the second aspect, the first capacitor comprises a first metal layer and a second metal layer, the first metal layer and the second metal layer are spaced apart along a first direction, and projections of the first metal layer and the second metal layer on a plane where the floor is located along the first direction at least partially overlap, the first metal layer is electrically connected with the first border at a first feeding point, and the second metal layer is electrically connected with the first feeding unit, the first direction being a direction perpendicular to the plane where the floor is located; the second capacitor comprises a third metal layer and a fourth metal layer, the third metal layer and the fourth metal layer are spaced apart along the first direction, and projections of the third metal layer and the fourth metal layer on the plane where the floor is located along the first direction at least partially overlap, the third metal layer is electrically connected with the first border at a second feeding point, and the fourth metal layer is electrically connected with the second feeding unit.

[0031] In some embodiments of the second aspect, the antenna further comprises an inductor, a first end of the inductor is electrically connected with the second metal layer, and a second end of the inductor is electrically connected with the fourth metal layer.

[0032] In some embodiments of the second aspect, a length of the first border between the first feeding point and the first grounding point is less than or equal to one-eighth of a first wavelength, the first wavelength being a wavelength corresponding to the first resonance; and a length of the first border between the second feeding point and the first grounding point is less than or equal to one-eighth of the first wavelength.

[0033] In some embodiments of the second aspect, the border further has a third position and a fourth position, a border between the second position and the fourth position being a second border, the second border comprising the first border, the third position being located between the fourth position and the first position; the border is grounded at the third position, and a gap is provided at the fourth position; the antenna comprises a second border, a border between the third position and the fourth position comprising a second grounding point, a third feeding point, and a fourth feeding point, the third feeding point being located between the second grounding point and the third position, and the fourth feeding point being located between the second grounding point and the fourth position.

[0034] In some embodiments of the second aspect, when the first feeding unit feeds, the antenna generates a first resonance and a second resonance, a resonance frequency of the first resonance being lower than a resonance frequency of the second resonance; a length of the border between the first position and the third position is greater than or equal to one-fifth of a first wavelength and less than or equal to one-half of the first wavelength, the first wavelength being a wavelength corresponding to the first resonance. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1 is a structural schematic diagram of an electronic device provided by an embodiment of the present application.

[0036] Figure 2 is a schematic diagram of an electronic device 100 provided by an embodiment of the present application.

[0037] Figure 3 is a schematic diagram of a resonance path of a first resonance and a resonance path of a second resonance.

[0038] Figure 4 is a schematic diagram of a resonance path of a third resonance and a resonance path of a fourth resonance.

[0039] Figure 5 is a schematic diagram of a current generated when a first feeding unit is fed.

[0040] Figure 6 is a schematic diagram of a current generated when a first feeding unit is fed.

[0041] Figure 7 is a schematic diagram of a current distribution when a first feeding unit and a second feeding unit are fed.

[0042] Figure 8 is a schematic diagram of a current distribution when a first feeding unit and a second feeding unit are fed.

[0043] Figure 9 is a schematic diagram of a current distribution when a first feeding unit and a second feeding unit are fed.

[0044] Figure 10 is a schematic diagram of a current distribution when a first feeding unit and a second feeding unit are fed.

[0045] Figure 11 is a schematic diagram of a first capacitor and a second capacitor.

[0046] Figure 12 is Figure 2 S parameters of an antenna in the electronic device shown in FIG. 1.

[0047] Figure 13 is Figure 2 a simulation result diagram of system efficiency and radiation efficiency of an antenna in the electronic device shown in FIG. 1.

[0048] Figure 14 is a structural schematic diagram of an electronic device 100 provided by an embodiment of the present application.

[0049] Figure 15 is an impedance circle diagram of a CM mode and a DM mode.

[0050] Figure 16 isFigure 14 S-parameters of the antenna in the electronic device 100 shown.

[0051] Figure 17 is a structural schematic diagram of an electronic device 200 provided by an embodiment of the present application.

[0052] Figure 18 is another structural schematic diagram of an electronic device 200 provided by an embodiment of the present application.

[0053] Figure 19 is still another structural schematic diagram of an electronic device 200 provided by an embodiment of the present application.

[0054] Figure 20 is Figure 17 S-parameters of the antenna in the electronic device 200 shown.

[0055] Figure 21 is Figure 17 Isolation degree simulation results of the antenna in the electronic device 200 shown. DETAILED DESCRIPTION

[0056] Hereinafter, terms that can appear in embodiments of the present application are explained.

[0057] 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 is understood as physical contact and electrical conduction of components; it can also be understood as a form of connection between different components in a circuit structure through a physical circuit such as copper foil or wire on a printed circuit board (PCB) that can transmit electrical signals; "indirect coupling" can be understood as electrical conduction between two conductors through a space without contact. In an embodiment, indirect coupling can also be referred to as capacitive coupling, for example, through the coupling between the gap between two conductive parts to form an equivalent capacitor to achieve signal transmission.

[0058] Connection / connection: can refer to a mechanical connection relationship or a physical connection relationship, for example, A and B are connected or A and B are connected, which can mean that there is a fastening component (such as a screw, bolt, rivet, etc.) between A and B, or A and B are in contact with each other and A and B are difficult to separate.

[0059] Capacitance: can be understood as lumped capacitance and / or distributed capacitance. Lumped capacitance refers to components that exhibit capacitance, such as a capacitor element; distributed capacitance (or distributed capacitance) refers to an equivalent capacitor formed by spacing two conductive parts by a certain gap.

[0060] Resonance / resonant frequency: Resonant frequency can refer to the frequency at which the imaginary part of the input impedance of an antenna is zero. Resonant frequency can have a frequency range, i.e., a range of frequencies at which resonance occurs. The frequency at which resonance is strongest is the center frequency point. The return loss characteristic at the center frequency can be less than -20 dB.

[0061] Resonant band / communication band / operating band: Regardless of the type of antenna, it always operates in a certain frequency range (bandwidth). For example, an antenna supporting B40 band has an operating band including frequencies in the range of 2300-2400 MHz, 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.

[0062] Electrical length: It can refer to the ratio of the physical length (i.e., mechanical length or geometric length) to the wavelength of the electromagnetic wave transmitted, and the electrical length can satisfy the following formula:

[0063]

[0064] Wherein, L is the physical length, and λ is the wavelength of the electromagnetic wave.

[0065] Wavelength: or operating wavelength, which can be the wavelength corresponding to the center frequency of the resonant frequency or the center frequency of the operating band supported by the antenna. For example, assuming that the center frequency of the B1 uplink band (resonant frequency of 1920-1980 MHz) is 1955 MHz, the operating wavelength can be the wavelength calculated using the frequency of 1955 MHz. 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 band.

[0066] The intermediate or intermediate position and other such position and distance limitations mentioned in the embodiments of the present application are all with respect to the current process level, rather than an absolutely strict definition in the mathematical sense. For example, the middle (position) of the conductor can be a conductor portion including the midpoint on the conductor, or a conductor portion of one-eighth wavelength including the midpoint of the conductor, wherein the wavelength can be the wavelength corresponding to the operating band of the antenna, the wavelength corresponding to the center frequency of the operating band, or the wavelength corresponding to the resonant point. For another example, the middle (position) of the conductor can be a conductor portion on the conductor that is less than a predetermined threshold (e.g., 1 mm, 2 mm, or 2.5 mm) from the midpoint.

[0067] The symmetry (for example, axial symmetry, or central symmetry, etc.), parallel, vertical, identical (for example, the same length, the same width, the same structure, etc.) and the like mentioned in the embodiments of the present application are relative to the current process level, rather than the absolute definition in the mathematical sense. For example, there can be a deviation of a predetermined angle (for example, ±5°, ±10°) between two antenna units that are parallel or vertical to each other.

[0068] Antenna radiation efficiency: refers to the ratio of the power radiated by the antenna to the space (i.e., the power of the electromagnetic wave part effectively converted) and the active power input to the antenna. Among them, the active power input to the antenna = the input power of the antenna - the loss power; the loss power mainly includes the return loss power and the ohmic loss power of the metal and / or the dielectric loss power. The radiation efficiency is a value for measuring the radiation capability of the antenna, and the metal loss and the dielectric loss are both factors affecting the radiation efficiency.

[0069] 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 represented.

[0070] Antenna return loss: can be understood as the ratio of the signal power reflected back to the antenna port through the antenna circuit to the antenna port transmission power. The smaller the reflected signal, the greater the signal radiated by the antenna to the space, and the greater the antenna radiation efficiency. The greater the reflected signal, the smaller the signal radiated by the antenna to the space, and the smaller the antenna radiation efficiency.

[0071] The antenna return loss can be represented by the S11 parameter, which belongs to one of the S parameters. S11 represents the reflection coefficient, and this parameter can represent the advantages and disadvantages of the antenna transmission efficiency. 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, that is, the more energy actually entering the antenna, and the higher the system efficiency of the antenna; the larger the S11 parameter, the larger the antenna return loss, and the lower the system efficiency of the antenna.

[0072] It should be noted that the S11 value of-6dB is generally used 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.

[0073] Ground or floor: can refer to at least a portion of any ground layer, or ground plate, or ground metal layer, or any combination of the above in an electronic device (such as a mobile phone), or any ground layer, or ground plate, or ground component, etc. in the electronic device. In one embodiment, the ground can be a ground layer of a circuit board of the electronic device, or a ground plate formed by a middle frame of the electronic device, or a ground metal layer formed by a metal film under a screen of the electronic device. In one embodiment, the circuit board can be a printed circuit board (PCB), such as an 8-layer, 10-layer, or 12-14 layer board with 8, 10, 12, 13, or 14 layers of conductive material, or elements separated and electrically insulated by a dielectric layer or insulating layer such as glass fiber, polymer, etc. In one embodiment, the circuit board includes a dielectric substrate, a ground layer, and a trace layer, and the trace layer and the ground layer are electrically connected by a via. In one 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 trace layer and / or the ground layer in the circuit board. For example, a radio frequency source is disposed on the trace layer.

[0074] Any ground layer, or ground plate, or ground metal layer described above is made of a conductive material. In one 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.

[0075] Perfect electric conductor (PEC): on the surface of a perfect electric conductor, all electric fields are perpendicular to the PEC (magnetic fields are parallel to the PMC).

[0076] Perfect magnetic conductor (PMC): on the surface of a perfect magnetic conductor, all magnetic fields are perpendicular to the PMC (electric fields are parallel to the PMC).

[0077] It should be understood that the resonance frequency band of the first resonance and the resonance frequency band of the second resonance mentioned herein (also referred to as the same frequency, the same) can be understood as any one of the following cases:

[0078] The resonant frequency bands of the first and second resonances include the same communication frequency band. For example, the first and second resonances can be applied to a MIMO antenna system. Since both the resonant frequency bands of the first and second resonances include the sub-6G frequency band in 5G, it can be considered that the resonant frequency bands of the first and second resonances are at the same frequency.

[0079] The resonant frequency bands of the first and second resonances partially overlap. For example, the resonant frequency band of the first resonance includes B35 (1.85-1.91GHz) in LTE, and the resonant frequency band of the second resonance includes B39 (1.88-1.92GHz) in LTE. Since the frequencies of the first and second resonances partially overlap, it can be considered that the resonant frequency bands of the first and second resonances are at the same frequency. The technical solutions of the embodiments of this application will be described below with reference to the accompanying drawings.

[0080] like Figure 1 As shown, the electronic device 10 may 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 may be a glass cover, but it may also be replaced with a cover made of other materials, such as an ultra-thin glass cover, a PET (Polyethylene terephthalate) cover, etc.

[0081] The cover plate 13 can be set close to the display module 15, and can be mainly used to protect the display module 15 from dust.

[0082] In one embodiment, the display module 15 may include a liquid crystal display (LCD), a light emitting diode (LED) display panel, or an organic light-emitting diode (OLED) display panel, etc., and this application embodiment does not limit this.

[0083] The middle frame 19 mainly serves to support the entire machine. Figure 1PCB 17 can be made of a flame resistant 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 resistant material grade, and the Rogers dielectric board is a high-frequency board. The PCB 17 carries electronic components, such as radio frequency chips, etc. In an embodiment, the PCB 17 can be provided with a metal layer. The metal layer can be used for grounding the electronic components carried on the PCB 17, and can also be used for grounding other components, such as a bracket antenna, a frame antenna, etc. The metal layer can be referred to as a ground plate, or a grounding plate, or a grounding layer. In an embodiment, the metal layer can be formed by etching metal on the surface of any one of the dielectric boards in the PCB 17. In an embodiment, the metal layer for grounding can be provided on one side of the PCB 17 close to the middle frame 19. In an embodiment, the edge of the 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 the above-mentioned components. The electronic device 10 can also have other ground plates / grounding plates / grounding layers, as described above, which will not be repeated here.

[0084] The electronic device 10 can also include a battery (not shown in the figure). The battery can be disposed between the middle frame 19 and the back cover 21, or can be disposed 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 disposed between the main board and the sub-board. The main board can be disposed between the middle frame 19 and the upper edge of the battery, and the sub-board can be disposed between the middle frame 19 and the lower edge of the battery.

[0085] The electronic device 10 can also include a frame 11, which can be formed of a conductive material such as metal. The frame 11 can be disposed between the display module 15 and the back cover 21 and extend circumferentially around the periphery of the electronic device 10. The frame 11 can have four side edges surrounding the display module 15, helping to fix the display module 15. In one implementation, the frame 11 made of metal material can be directly used as a metal frame of the electronic device 10, forming a metal frame appearance, suitable for metal industrial design (ID). In another implementation, the outer surface of the frame 11 can also be a non-metal material, such as a plastic frame, forming a non-metal frame appearance, suitable for non-metal ID.

[0086] The middle frame 19 can include the bezel 11, and the middle frame 19 including the bezel 11 can support the electronic devices in the whole machine as an integral part. The cover plate 13 and the back cover 21 are respectively attached along the upper and lower edges of the bezel to form the housing of the electronic device. In an embodiment, the cover plate 13, the back cover 21, the bezel 11 and / or the middle frame 19 can be collectively referred to as the housing of the electronic device 10. 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.

[0087] The bezel 11 on the middle frame 19 can at least partially serve as an antenna radiator to receive / transmit radio frequency signals. The part of the bezel serving as the radiator can have a gap with other parts of the middle frame 19 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 part of the bezel serving as the radiator to facilitate the radiation of the antenna.

[0088] Alternatively, the bezel 11 can not be considered as a part of the middle frame 19. In an embodiment, the bezel 11 can be connected to and integrally formed with the middle frame 19. In another embodiment, the bezel 11 can include a protruding member extending inward to be connected to the middle frame 19, for example, by a spring, a screw, welding or the like. The protruding member of the bezel 11 can also be used to receive a feed signal, so that at least part of the bezel 11 serves as an antenna radiator to receive / transmit radio frequency signals. The part of the bezel serving as the radiator can have a gap 42 with the middle frame 30 to ensure that the antenna radiator has a good radiation environment, so that the antenna has a good signal transmission function.

[0089] The back cover 21 can be made of a metal material, or can be made of a non-conductive material such as a glass back cover, a plastic back cover or the like non-metal back cover. The back cover 21 can also be made of a combination of a conductive material and a non-conductive material.

[0090] The antenna of the electronic device 10 can also be arranged in the bezel 11. When the bezel 11 of the electronic device 10 is made of a non-conductive material, the antenna radiator can be arranged inside the electronic device 10 and along the bezel 11. For example, the antenna radiator can be arranged close to the bezel 11 to minimize the volume occupied by the antenna radiator and to be closer to the outside of the electronic device 10 to achieve better signal transmission effect. It should be noted that the arrangement of the antenna radiator close to the bezel 11 means that the antenna radiator can be arranged closely to the bezel 11, or can be arranged close to the bezel 11, for example, the antenna radiator and the bezel 11 can have a small gap therebetween.

[0091] The antenna of electronic device 10 can also be housed inside the casing, such as a bracket antenna, millimeter-wave antenna, etc. Figure 1 (Not shown in the image). The clearance of the antenna disposed within the housing can be obtained by a slot / aperture on any of the middle frame, and / or side frame, and / or back cover, and / or display screen, or by a non-conductive gap / aperture formed between any of them. The clearance setting of the antenna can ensure the radiation performance of the antenna. It should be understood that the clearance of the antenna can be a non-conductive area formed by any conductive components within the electronic device 10, through which the antenna radiates signals to the external space. In one embodiment, the antenna 40 can be in the form of an antenna based on a flexible printed circuit (FPC), an antenna based on laser-direct-structuring (LDS), or a microstrip disk antenna (MDA), etc. In one embodiment, the antenna can also be a transparent structure embedded inside the screen of the electronic device 10, making the antenna a transparent antenna unit embedded inside the screen of the electronic device 10.

[0092] Figure 1 The electronic device 10 is shown only schematically, and the actual shape, size, and construction of these components are not subject to change. Figure 1 limited.

[0093] It should be understood that in the embodiments of this application, the side where the display screen of the electronic device is located can be considered as the front, the side where the back cover is located as the back, and the side where the frame is located as the side.

[0094] It should be understood that, in the embodiments of this application, when a user holds (typically vertically and facing the screen) an electronic device, the orientation of the electronic device is considered to have a top, bottom, left side, and right side.

[0095] Figure 2 This is a schematic diagram of an electronic device 100 provided in an embodiment of this application.

[0096] like Figure 2 As shown, the electronic device 100 may include a floor 110, a frame 11, and an antenna 120.

[0097] The frame 11 has a first position 101 and a second position 102. The frame 11 is grounded at the first position 101 through the ground 110, and a gap is provided at the second position 102. The frame 11 between the first position 101 and the second position 102 is a first frame 104. The antenna 120 includes the first frame 104, which serves as the radiator of the antenna 120.

[0098] The first frame 104 includes a grounding point 121, a first feeding point 131, and a second feeding point 132. The first feeding point 131 is located between the grounding point 121 and the first position 101, and the second feeding point 132 is located between the grounding point 121 and the second position 102.

[0099] The antenna 120 can further include a first capacitive component, a second capacitive component, a first feeding unit 133, and a second feeding unit 134. A first end of the first capacitive component is electrically connected to the first frame 104 at the first feeding point 131, a second end of the first capacitive component is electrically connected to the first feeding unit 133, and the first capacitive component is connected in series between the first frame 104 and the first feeding unit 133 at the first feeding point 131. A first end of the second capacitive component is electrically connected to the first frame 104 at the second feeding point 132, a second end of the second capacitive component is electrically connected to the second feeding unit 134, and the second capacitive component is connected in series between the first frame 104 and the second feeding unit 134 at the second feeding point 132. In an embodiment, the first capacitive component includes a first capacitor 122, and the second capacitive component includes a second capacitor 123.

[0100] wherein the length L1 of the first frame between the first position 101 and the grounding point 121 and the length L2 of the first frame between the second position 102 and the grounding point 121 satisfy: 1.8≤L1 / L2≤2.2.

[0101] In an embodiment, when the electrical signal is fed in at the feeding point, the current path in the process of the electrical signal returning to the ground through the grounding point 121 further includes a conductive structure integrally formed with the first frame and extending inward from the inner surface of the first frame, and the length of the conductive structure is L0. It should be understood that the above-mentioned length L1 of the first frame between the first position 101 and the grounding point 121 can also be understood as the sum of the physical length L1' of the first frame between the first position 101 and the grounding point 121 and L0, and the length L2 of the first frame between the second position 102 and the grounding point 121 can also be understood as the sum of the physical length L2' of the first frame between the second position 102 and the grounding point 121 and L0.

[0102] In one embodiment, when the electrical signal is fed in at the feed point, the current path in the process of grounding the electrical signal by the grounding point 121 can also include a conductive connecting piece disposed on the PCB or the floor 110, the conductive connecting piece is coupled with the first frame, and the length of the conductive connecting piece is L0'. It should be understood that the length L1 of the first frame between the first position 101 and the grounding point 121 can also be understood as the sum of the physical length L1' of the first frame between the first position 101 and the grounding point 121 and L0', and the length L2 of the first frame between the second position 102 and the grounding point 121 can also be understood as the sum of the physical length L2' of the first frame between the second position 102 and the grounding point 121 and L0'.

[0103] At the same time, by connecting an electronic element (for example, a capacitor or an inductor) in series between the first frame 104 and the floor 110, the physical length of the first frame 104 can be changed without changing the electrical length of the first frame 104, and accordingly, the ratio between L1 and L2 can also be changed.

[0104] When the first feeding unit 133 feeds, the antenna 120 can serve as a first antenna unit to generate a first resonance and a second resonance, the resonance frequency of the first resonance is lower than the resonance frequency of the second resonance. Among them, the first frame 104 between the first position 101 and the second position 102 is used to generate the first resonance, and the first frame 104 between the first position 101 and the first feed point 131 is used to generate the second resonance. It should be understood that the first frame 104 between the first position 101 and the second position 102 for generating the first resonance can be understood as the first frame 104 between the first position 101 and the second position 102 being the main radiator for generating the first resonance, and when the electrical signal is fed in, the first resonance is generated by this part of the frame, and other similar concepts, for example, for generating the second resonance, can also be understood accordingly. Corresponding to the first resonance, the antenna 120 is a line antenna structure, and the working mode is a three-quarter wavelength mode, and the corresponding resonance path is as shown in Figure 3 Corresponding to the second resonance, the antenna 120 is a closed slot hole structure, and the working mode is a half wavelength mode, and the corresponding resonance path is as shown in Figure 3

[0105] ​When the second feeding unit 134 feeds, the antenna 120 can generate a third resonance and a fourth resonance as a second antenna unit, the resonance frequency band of the first resonance and the resonance frequency band of the third resonance are the same frequency (both the resonance frequency band of the first resonance and the resonance frequency band of the third resonance include the first frequency band), and the resonance frequency band of the second resonance and the resonance frequency band of the fourth resonance are the same frequency (both the resonance frequency band of the second resonance and the resonance frequency band of the fourth resonance include the second frequency band). Therefore, the antenna 120 can be applied to a MIMO system. Among them, the third resonance is generated by the first frame 104 between the ground point 121 and the second position 102, and the fourth resonance is generated by the first frame 104 between the second feeding point 132 and the second position 102. Corresponding to the third resonance, the antenna 120 is an inverted-F antenna (IFA) structure, the working mode is a quarter wavelength mode, and the resonance path is as shown in Figure 4 . Corresponding to the fourth resonance, the antenna 120 is a slot hole structure, the working mode is a quarter wavelength mode, and the resonance path is as shown in Figure 4 .

[0106] The technical scheme provided by the embodiment of the application forms a double-antenna structure, uses part of the frame of the electronic device as a radiator of the antenna, only a single slot is formed on the frame 11, the complexity of the process manufacturing is greatly reduced, and the influence on the integrity of the frame is reduced. At the same time, each antenna unit in the double-antenna structure can generate double resonance, can work in two different frequency bands at the same time, meets the communication requirements of the electronic device, and the isolation degree between the two antenna units can be maintained well.

[0107] In one embodiment, the length of the first frame 104 is three quarters of a first wavelength, and the first wavelength is a wavelength corresponding to the first resonance. For example, the first wavelength can be a wavelength corresponding to a resonance point of the first resonance, or can also be a wavelength corresponding to a center frequency of a resonance frequency band of the first resonance. It should be understood that since the resonance frequency band of the first resonance and the resonance frequency band of the third resonance are the same frequency, the first wavelength can be a wavelength corresponding to the third resonance. It should be understood that due to the influence of the layout and electronic elements in the electronic device, the first frame 104 can have a certain error range. For example, when an electronic element (such as a capacitor or an inductor) electrically connected to the first frame 104 is arranged, the physical length of the first frame 104 can be increased or decreased. Therefore, when the electronic element is arranged, the physical length of the first frame 104 can be within a range of plus or minus thirty percent (±30%) of the first wavelength.

[0108] In one embodiment, the length of the first edge frame 104 between the first feeding point 131 and the ground point 121 is less than or equal to one-eighth of the first wavelength. In one embodiment, the length of the first edge frame 104 between the second feeding point 132 and the ground point 121 is less than or equal to one-eighth of the first wavelength. The positions of the first feeding point 131 and the second feeding point 132 are adjusted so that the antenna 120 can generate the first resonance, the second resonance, the third resonance and the fourth resonance when fed with the electrical signal.

[0109] In one embodiment, the resonance frequency f1 of the first resonance and the resonance frequency f2 of the second resonance satisfy: 1.1≤f2 / f1≤1.5. In one embodiment, the resonance frequency f3 of the third resonance and the resonance frequency f4 of the fourth resonance satisfy: 1.1≤f4 / f3≤1.5. It should be understood that since the antenna 120 generates the first resonance, the second resonance, the third resonance and the fourth resonance, the edge frame is reused, therefore, in order to have good radiation characteristics of the antenna 120 at high frequency (the resonance frequency band of the second resonance and the resonance frequency band of the fourth resonance) and low frequency (the resonance frequency band of the first resonance and the resonance frequency band of the third resonance), the frequency difference between the low frequency and the high frequency should be kept within a reasonable range.

[0110] It should be understood that when the first feeding unit 133 indirectly couples and feeds the electrical signal through the first capacitor 122, the first antenna unit excites the first resonance at the first frequency band and the second resonance at the second frequency band. By adjusting the capacitance value of the first capacitor 122, the first capacitor 122 can be in open circuit state at the first frequency band and in short circuit state at the second frequency band. When the first capacitor 122 is in open circuit state, the current on the edge frame between the first position and the second position is as shown in FIG. 6, the first feeding point is a current zero point area, corresponding to an electric field strong point area, and presents a large electric field boundary condition at the first feeding point. When the first capacitor 122 is in short circuit state, the current on the edge frame between the first position and the first feeding point is as shown in FIG. 7, the first feeding point is a current strong point area, corresponding to an electric field zero point area, and presents a large current boundary condition at the first feeding point. Due to the different boundary conditions of the first resonance and the second resonance, although the first edge frame 104 between the first position 101 and the first feeding point 131 is reused, good isolation between the two can still be maintained. Figure 5 Figure 6 Similarly, when the second feeding unit 134 indirectly couples and feeds the electrical signal through the second capacitor 123, the second antenna unit excites the third resonance at the first frequency band and the fourth resonance at the second frequency band. By adjusting the capacitance value of the second capacitor 123, the second capacitor 123 can be in open circuit state at the first frequency band and in short circuit state at the second frequency band, so that the boundary conditions of the third resonance and the fourth resonance generated by the antenna 120 are different, thereby improving the isolation between the two.

[0111] Similarly, when the second feeding unit 134 indirectly couples and feeds the electrical signal through the second capacitor 123, the second antenna unit excites the third resonance at the first frequency band and the fourth resonance at the second frequency band. By adjusting the capacitance value of the second capacitor 123, the second capacitor 123 can be in open circuit state at the first frequency band and in short circuit state at the second frequency band, so that the boundary conditions of the third resonance and the fourth resonance generated by the antenna 120 are different, thereby improving the isolation between the two.​

[0112] In the first frequency band, when the antenna 120 is excited by the first feeding unit 133 (as the first antenna unit), the working mode of the antenna is the three-quarter wavelength mode, in which the antenna has two current strong point regions (current strong point regions) and one current zero point region (current zero point region), and the current distribution is as shown in Figure 5 . As shown in Figure 5 , the grounding point is located in the current strong point region, corresponding to the electric field zero point region, and the corresponding boundary conditions are satisfied, and the grounding point does not affect the working mode of the antenna. At the second feeding point, it is a current strong point region, corresponding to an electric field zero point region. And when the antenna 120 is excited by the second feeding unit 134 (as the second antenna unit), the second feeding point is a current zero point region, corresponding to an electric field strong point region. Therefore, when the first feeding unit feeds in an electrical signal, at the second feeding point, the boundary conditions are mutually exclusive, and the electrical signal fed by the first feeding unit has little effect on the second feeding unit. Thus, in the first frequency band, the first antenna unit (first resonance) and the second antenna unit (third resonance) have good isolation.

[0113] In the first frequency band (for example, 3.5 GHz), when the first feeding point and the second feeding point feed in equal amplitude and in-phase (same amplitude and same phase) electrical signals, the current distribution on the first frame is as shown in Figure 7 (a). In the first frequency band, when the first feeding point and the second feeding point feed in equal amplitude and opposite phase (same amplitude and phase difference of 180°±10°) electrical signals, the current distribution on the first frame is as shown in Figure 7 (b). As shown in Figure 7 (a), the current on the right side of the first frame is centrally symmetrically distributed, which can be equivalent to the existence of PMC (the currents on both sides of the PMC are symmetrically distributed along the PMC), which can be CM mode characteristics. Among them, the CM mode can be understood as the current on the radiator presents reverse distribution (for example, symmetric distribution) on both sides of the middle position (for example, the position equivalent to the existence of the PMC in Figure 7 (a)), and the electric field presents same direction distribution on both sides of the middle position.

[0114] As shown in Figure 7 (b), the current on the right side of the first frame is asymmetrically distributed (for example, same direction distribution), which can be equivalent to the existence of PEC (the currents on both sides of the PEC are asymmetrically distributed, for example, same direction distribution), which can be DM mode characteristics. Among them, the DM mode can be understood as the current on the radiator presents same direction distribution (for example, asymmetric distribution) on both sides of the middle position (for example, the position equivalent to the existence of the PEC in Figure 7 (b)); the electric field presents reverse distribution on both sides of the middle position.

[0115] The antenna has both CM and DM modes in the first frequency band. Since the radiation beams generated by the current distribution in CM and DM modes are orthogonal in the far-field integral, the mutual influence between CM and DM modes is small. Therefore, the two antenna sub-units in the dual antenna structure can have good isolation. For example, the first antenna unit (first resonance) and the second antenna unit (third resonance) can maintain good isolation in the first frequency band.

[0116] In the first frequency band (taking 3.5GHz as an example), the radiation pattern generated by the first antenna element is as follows: Figure 8 As shown in (a), its maximum radiation direction is the x-direction, and the radiation pattern generated by the second antenna element is as follows. Figure 8 As shown in (b) in the figure, its maximum radiation direction is the z-direction.

[0117] In the second frequency band (taking 4.5GHz as an example), when the first feeding unit feeds in an electrical signal, the current distribution on the first frame is as follows: Figure 9 As shown in (a) above. When the second power supply unit feeds in an electrical signal, the current distribution on the first frame is as follows. Figure 9 As shown in (b), when the first feed unit receives an electrical signal, the current on the first frame is mainly concentrated between the first feed point and the first position. When the second feed unit receives an electrical signal, the current on the first frame is mainly concentrated between the second feed point and the second position. There is relatively little current flow between the first feed point and the second feed point, thus providing good isolation between the first antenna element (second resonant) and the second antenna element (fourth resonant) in the second frequency band.

[0118] Simultaneously, when the second resonance occurs, the antenna 120 has a closed slot structure, and the radiation pattern generated by the antenna 120 is as follows: Figure 10 As shown in (a) and (b), its maximum radiation direction is located between the z and x directions. When the fourth resonance is generated, antenna 120 has a slotted structure, and the radiation pattern generated by antenna 120 is as follows... Figure 10 As shown in (c), its maximum radiation is directed towards the opening direction, for example, the y-direction. Therefore, when the second resonance and the fourth resonance are generated, the maximum radiation directions of the radiation patterns generated by antenna 120 are not the same, and there is spatial diversity between them, thus providing good isolation between the first antenna element (second resonance) and the second antenna element (fourth resonance) in the second frequency band.

[0119] In one embodiment, the operating frequency band of antenna 120 may include at least a portion of the frequency bands selected from N77 (3300MHz-42000MHz), N78 (3300MHz-3800MHz), or N79 (4400MHz-5000MHz).

[0120] In one embodiment, the capacitance value C1 of the first capacitor 122 satisfies: 0.3pF≤C1≤1pF.

[0121] In one embodiment, the capacitance value C2 of the second capacitor 123 satisfies: 0.3pF≤C2≤1pF.

[0122] It should be understood that, for the sake of brevity, this application only uses the 3300MHz-3800MHz frequency band as an example for illustration. In practical applications, the capacitance values ​​of the first capacitor and the second capacitor can be adjusted according to design requirements.

[0123] In one embodiment, the first capacitor 122 includes at least one of a lumped capacitor element and a distributed capacitor element.

[0124] In one embodiment, the second capacitor 123 includes at least one of a lumped capacitor element and a distributed capacitor element.

[0125] In one embodiment, when the first capacitor is a distributed capacitor, the first capacitor includes a first metal layer 1221 and a second metal layer 1222, such as... Figure 11 As shown in (a) of the diagram. The first metal layer 1221 and the second metal layer 1222 are spaced apart along a first direction, and the projections of the first metal layer 1221 and the second metal layer 1222 along the first direction onto the plane containing the floor 110 at least partially overlap. The first metal layer 1221 is electrically connected to the first frame 104 at the first feed point 131, as shown in (a). Figure 11 As shown in (b) above. The second metal layer 1222 is electrically connected to the first power supply unit 133, as shown in (b). Figure 11 As shown in (c) in the diagram. The first direction is a direction perpendicular to the plane where the floor 110 is located, such as the z-direction.

[0126] In one embodiment, when the second capacitor is a distributed capacitor, the second capacitor includes a third metal layer 1231 and a fourth metal layer 1232. The third metal layer 1231 and the fourth metal layer 1232 are spaced apart along a first direction, and their projections along the first direction onto the plane of the floor 110 at least partially overlap. The third metal layer 1231 is electrically connected to the first frame 104 at the second feed point 132, such as... Figure 11 As shown in (b) above. The fourth metal layer 1232 is electrically connected to the second feed unit 134, as shown in (b). Figure 11 As shown in (c) in the figure.

[0127] It should be understood that the capacitance value of a distributed capacitor satisfies the following formula:

[0128]

[0129] Wherein, ε is the relative dielectric constant of the medium filled between the two plates (for example, the first metal layer 1221 and the second metal layer 1222); δ is the absolute dielectric constant in vacuum; k is the electrostatic force constant; S is the facing area of the two plates, for example, the relative area of the first metal layer 1221 and the second metal layer 1222 in the embodiment of the present application (the area of the overlapping part of the projections of the first metal layer 1221 and the second metal layer 1222 along the first direction on the plane where the floor 110 is located); d is the vertical distance between the two plates, for example, the distance between the first metal layer 1221 and the second metal layer 1222 along the first direction (z direction) in the embodiment of the present application.

[0130] Therefore, by controlling the electrical parameters of the first capacitor 122 or the electrical parameters of the second capacitor 123, the capacitance value of the first capacitor 122 or the second capacitor 123 can be adjusted, so as to adjust the radiation characteristics of the antenna.

[0131] In one embodiment, the first metal layer 1221 and the third metal layer 1231 can be arranged on the first surface of the PCB 17. The second metal layer 1222 and the fourth metal layer 1232 can be arranged on the second surface of the PCB 17.

[0132] It should be understood that the first surface and the second surface of the PCB 17 can be the upper surface and the lower surface of the PCB 17, or can be any surface of a plurality of medium plates arranged in a stack in the PCB (for example, the first metal layer can be arranged between any two adjacent medium plates in the PCB 17), and the embodiment of the present application does not limit this.

[0133] Figure 12 And Figure 13 is Figure 2 the simulation result diagram of the antenna in the electronic device shown in FIG. 8. Wherein, Figure 12 is Figure 2 the S parameter of the antenna in the electronic device shown in FIG. 8. Figure 13 is Figure 2 the simulation result diagram of the system efficiency and the radiation efficiency of the antenna in the electronic device shown in FIG. 8.

[0134] It should be understood that, for the sake of brevity of the discussion, the length of the first frame 104 is only taken as 51mm, the clearance of the antenna (the distance between the frame 11 and the floor 110) is taken as 3mm, the size of the floor 110 is taken as 120mm*50mm, the capacitance value of the first capacitor 122 is taken as 0.4pF, and the capacitance value of the second capacitor 123 is taken as 0.7pF in the embodiment of the present application, and the above-mentioned electrical parameters can be adjusted according to the actual design, and the present application does not limit this.

[0135] As Figure 12As shown, the operating frequency band of the first antenna unit (when the first feed point feeds an electrical signal) can include 3.3GHz to 5GHz, which can be applied to the N77, N78 and N79 frequency bands of 5G, with S parameters (S11, S22) < -4 as the boundary.

[0136] It should be understood that although the first antenna unit generates the first resonance and the second antenna unit generates the third resonance, the isolation between the first antenna unit and the second antenna unit is greater than -16dB at the first frequency band (3.5GHz), with the common part of the frame as the radiator.

[0137] At the second frequency band (4.5GHz), the maximum radiation direction of the directional diagram generated by the first antenna unit and the directional diagram generated by the second antenna unit is not the same, and spatial diversity is presented between the two, and the first antenna unit generates the second resonance and the second antenna unit generates the fourth resonance without sharing the radiator, so the first antenna unit and the second antenna unit can maintain good isolation (isolation greater than -25dB).

[0138] As shown in Figure 13 In the operating frequency band (3.3GHz to 5GHz), the system efficiency (greater than -3dB) and the radiation efficiency (greater than -2dB) of the first antenna unit and the second antenna unit can both meet the communication needs.

[0139] Figure 14 is a structural schematic diagram of an electronic device 100 provided by an embodiment of the present application.

[0140] As shown in Figure 14 The difference between the electronic device 100 shown in Figure 2 The antenna in the electronic device 100 shown in Figure 14 The antenna in the electronic device 100 shown in

[0141] It should be understood that by arranging the inductor 151 between the first capacitor 122 and the second capacitor 123, the impedance corresponding to the CM mode and the impedance of the DM mode in the antenna can be adjusted, so as to adjust the isolation between the plurality of antenna units.

[0142] In one embodiment, the inductance value L1 of the inductor 151 satisfies: 1nH ≤ L1 ≤ 8nH.

[0143] It should be understood that for the sake of brevity of the discussion, the present application is only illustrated by taking the above 5G frequency bands as examples, and in actual application, the inductance value of the inductor 151 can be adjusted according to design requirements.

[0144] In one embodiment, when the first capacitor 122 and the second capacitor 123 are distributed capacitors, the inductor 151 can be connected in series between the metal layer forming the first capacitor 122 and the metal layer forming the second capacitor 123.

[0145] It should be understood that in the first frequency band, the antenna has both CM mode and DM mode. By connecting an inductor 151 in series between the first capacitor 122 and the second capacitor 123, the impedance corresponding to the CM mode and the impedance corresponding to the DM mode in the antenna can be adjusted.

[0146] like Figure 15 As shown in (a) in the figure, Figure 2 At low frequencies (around 3GHz), the impedances corresponding to CM mode and DM mode have significantly different endpoints.

[0147] like Figure 15 As shown in (b) in the figure, Figure 14 The impedances corresponding to CM mode and DM mode are brought closer together by connecting an inductor in series between the first and second capacitors. This is particularly noticeable near low frequencies (3GHz), where the distance between the impedances of CM mode and DM mode is significantly improved. It should be understood that as the impedances of CM mode and DM mode approach each other, their isolation increases.

[0148] like Figure 16 As shown, Figure 14 The S-parameters of the antenna in the electronic device 100 shown are as follows. The return loss of the first antenna element (S11) and the return loss of the second antenna element (S22) are compared with... Figure 2 The simulation results of the S-parameters corresponding to the medium antenna are similar, but the isolation between the first antenna element and the second antenna element is significantly improved, especially in the low frequency band (e.g., around 3.3 GHz), where the isolation is improved by about 10 dB.

[0149] Figure 17 This is a schematic diagram of the structure of an electronic device 200 provided in an embodiment of this application.

[0150] like Figure 17 As shown, the electronic device 200 may include a floor 210, a frame 11, and an antenna 220.

[0151] The bezel 11 has a first position 201, a second position 202, a third position 203 and a fourth position 204 (the first position 201 is between the second position 202 and the fourth position 204, and the third position 203 is between the first position 201 and the fourth position 204). The bezel 11 is grounded at the first position 201 and the third position 203 through the floor 210, and gaps are provided at the second position 102 and the fourth position 204. The bezel 11 between the second position 102 and the fourth position 204 is a first bezel 205. The antenna 220 includes the first bezel 205, and the first bezel 205 serves as a radiator of the antenna 220.

[0152] The first bezel 205 includes a first grounding point 221, a second grounding point 222, a first feeding point 231, a second feeding point 232, a third feeding point 233 and a fourth feeding point 234.

[0153] The first grounding point 221, the first feeding point 231 and the second feeding point 232 can be located on the bezel between the first position 201 and the second position 202. The second grounding point 222, the third feeding point 233 and the fourth feeding point 234 can be located on the bezel between the third position 203 and the fourth position 204. The first feeding point 231 is between the first grounding point 221 and the first position 201, and the second feeding point 232 is between the first grounding point 221 and the second position 202. The third feeding point 233 is between the second grounding point 222 and the third position 203, and the fourth feeding point 234 is between the second grounding point 222 and the fourth position 204.

[0154] The antenna 220 can further include a first capacitor 241, a second capacitor 242, a third capacitor 243 and a fourth capacitor 244, and a first feeding unit 251 and a second feeding unit 252, a third feeding unit 253 and a second feeding unit 254.

[0155] The first end of the first capacitor 241 is electrically connected to the first frame 205 at the first feeding point 231, the second end of the first capacitor 241 is electrically connected to the first feeding unit 251, and the first capacitor 241 is connected in series between the first frame 205 and the first feeding unit 251 at the first feeding point 231. The first end of the second capacitor 242 is electrically connected to the first frame 205 at the second feeding point 232, the second end of the second capacitor 242 is electrically connected to the second feeding unit 252, and the second capacitor 242 is connected in series between the first frame 205 and the second feeding unit 252 at the second feeding point 232. The first end of the third capacitor 243 is electrically connected to the first frame 205 at the third feeding point 233, the second end of the third capacitor 243 is electrically connected to the third feeding unit 253, and the third capacitor 243 is connected in series between the first frame 205 and the third feeding unit 253 at the third feeding point 233. The first end of the fourth capacitor 244 is electrically connected to the first frame 205 at the fourth feeding point 234, the second end of the fourth capacitor 244 is electrically connected to the fourth feeding unit 254, and the fourth capacitor 244 is connected in series between the first frame 205 and the fourth feeding unit 254 at the fourth feeding point 234.

[0156] The length L1 of the frame between the first position 201 and the first grounding point 221 and the length L2 of the frame between the second position 202 and the first grounding point 221 satisfy: 1.8≤L1 / L2≤2.2. The length L3 of the frame between the third position 203 and the second grounding point 222 and the length L4 of the frame between the fourth position 204 and the second grounding point 222 satisfy: 1.8≤L3 / L4≤2.2.

[0157] It should be understood that Figure 17 The antenna 220 shown is different from Figure 2 The antenna 120 shown in that the antenna 220 can include two symmetrical Figure 2 The antenna 120 shown in that the antenna 220 can include two symmetrical

[0158] The frame between the first position 201 and the second position 202 forms a first antenna (the first antenna can include a first antenna unit and a second antenna unit, when the first feeding unit 251 is fed, as the first antenna unit, when the second feeding unit 252 is fed, as the second antenna unit), and the frame between the third position 203 and the fourth position 204 forms a second antenna (the second antenna can include a third antenna unit and a fourth antenna unit, when the third feeding unit 253 is fed, as the third antenna unit, when the fourth feeding unit 254 is fed, as the fourth antenna unit). The first antenna and the second antenna have the same structure as Figure 2 The first antenna and the second antenna can be adjusted by the design of the frame between the first position 201 and the third position 203.

[0159] In one embodiment, the operating frequency bands of the first antenna formed by the edge between the first position 201 and the second position 202 and the second antenna formed by the edge between the third position 203 and the fourth position 204 can be the same, for example, the first antenna and the second antenna can operate in a MIMO system. In one embodiment, the operating frequency bands of the first antenna and the second antenna can be different, and the first antenna and the second antenna can operate in different communication frequency bands, respectively. It should be understood that when the operating frequency bands of the first antenna and the second antenna can be different, the structure of the first antenna and the structure of the second antenna are the same, but the length of the corresponding radiators can be adjusted, and the present application does not limit this, and the actual design can be adjusted. For the sake of brevity of the discussion, the present embodiment is only described by taking the example that the operating frequency bands of the first antenna and the second antenna are the same.

[0160] In one embodiment, the length of the edge between the first position 201 and the third position 203 is greater than or equal to one fifth of the first wavelength and less than or equal to one half of the first wavelength, and the first wavelength is the wavelength corresponding to the first resonance (the resonance of the low frequency generated when the first feed point unit is fed) of the first antenna. It should be understood that the antenna 220 can include multiple resonances of the same frequency, and the first resonance can also be replaced by other resonances of the same frequency as the resonance frequency band of the first resonance.

[0161] It should be understood that the isolation between the first antenna and the second antenna is improved with the increase of the length of the edge between the first position 201 and the third position 203. When the length of the edge between the first position 201 and the third position 203 is greater than or equal to one half of the first wavelength, an additional resonance can be generated, which can interfere with the antenna 220 and affect the radiation characteristics of the antenna 220. Therefore, the length of the edge between the first position 201 and the third position 203 needs to be within a reasonable range, for example, the length of the edge between the first position 201 and the third position 203 is between one fifth of the first wavelength and one half of the first wavelength.

[0162] In one embodiment, each position in the edge between the first position 201 and the third position 203 is electrically connected to the floor 210, as shown in Figure 18 Through this design, the electrical length between the first position 201 and the third position 203 can be kept unchanged, so as to shorten the physical distance between the first position 201 and the third position 203, thereby realizing the miniaturization of the antenna 220.

[0163] In one embodiment, the antenna 220 can further include a fifth capacitor 245 and a sixth capacitor 246, as shown in Figure 19As shown. The fifth capacitor 245 can be connected in series between the frame and the ground plane 210 at the first position 201. The sixth capacitor 246 can be connected in series between the frame and the ground plane 210 at the third position 203. Through this design, the electrical length between the first position 201 and the third position 203 can remain unchanged, thereby shortening the physical distance between the first position 201 and the third position 203 and achieving miniaturization of the antenna 220. At the same time, by setting the fifth capacitor 245 and the sixth capacitor 246, the impedance characteristics at the first position 201 and the third position 203 are adjusted, which can further improve the isolation between the first antenna element and the third antenna element.

[0164] Figure 20 and Figure 21 yes Figure 17 The simulation results of the antenna in the electronic device 200 are shown in the figure. Among them, Figure 20 yes Figure 17 The S-parameters of the antenna in the electronic device 200 shown. Figure 21 yes Figure 17 Simulation results of antenna isolation in the electronic device 200 shown.

[0165] It should be understood that the embodiments of this application are only illustrated by the example that the length of the first frame 205 is 116mm, the net clearance of the antenna (the distance between the frame 11 and the ground 210) is 3mm, the size of the ground 210 is 150mm×75mm, and the distance between the first position 201 and the third position 203 is 14mm. In actual design, adjustments can be made, and this application does not impose any restrictions on this.

[0166] like Figure 20 As shown, Figure 17 The simulation results of the four-antenna structure shown are consistent with Figure 2 The simulation results of the dual-antenna structure shown are similar. With the S-parameters (S11, S22, S33, S44) < -4 as the limit, the operating frequency bands of the four antenna elements can all include 3.3GHz to 5GHz, and can be applied to the N77, N78 and N79 frequency bands of 5G.

[0167] like Figure 21 As shown, within the operating frequency band (3.3GHz to 5GHz), the isolation between the four antenna elements is greater than -12dB, which meets the application requirements of MIMO systems and can be applied to MIMO systems.

[0168] Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0169] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the system, device and unit described above can refer to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0170] In several embodiments provided in the present application, it should be understood that the disclosed system, device and method can be implemented in other ways. For example, the device embodiments described above are only schematic, for example, the division of the units is only a logical function division, and actual implementation can have another division manner, for example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the units shown or discussed can be through some interface, device or unit, and can be electrical or other forms.

[0171] The above describes only the specific embodiments of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can easily think of changes or replacements within the technical scope 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, comprising: The electronic device comprises: a floor; a conductive frame, the frame having a first position and a second position, the frame being grounded at the first position, the second position being provided with a gap, the frame between the first position and the second position being a first frame; an antenna comprising the first frame, the first frame comprising a first grounding point, a first feeding point and a second feeding point, the first feeding point being located between the first grounding point and the first position, the second feeding point being located between the first grounding point and the second position; wherein the antenna further comprises a first capacitor, a second capacitor, a first feeding unit and a second feeding unit, a first end of the first capacitor being electrically connected to the first frame at the first feeding point, a second end of the first capacitor being electrically connected to the first feeding unit, a first end of the second capacitor being electrically connected to the first frame at the second feeding point, a second end of the second capacitor being electrically connected to the second feeding unit; a length L1 of the first frame between the first position and the first grounding point and a length L2 of the first frame between the second position and the first grounding point satisfy: 1.8≤L1 / L2≤2.

2.

2. The electronic device according to claim 1, wherein: when the first feeding unit is fed, the antenna generates a first resonance and a second resonance, a resonance frequency of the first resonance being lower than a resonance frequency of the second resonance; when the second feeding unit is fed, the antenna generates a third resonance and a fourth resonance; a resonance frequency band of the first resonance and a resonance frequency band of the third resonance are the same frequency, and a resonance frequency band of the second resonance and a resonance frequency band of the fourth resonance are the same frequency.

3. The electronic device of claim 2, wherein, a frequency ratio of the resonance frequency f1 of the first resonance and the resonance frequency f2 of the second resonance satisfies: 1.1≤f2 / f1≤1.

5.

4. The electronic device according to claim 1, wherein: a capacitance value C1 of the first capacitor satisfies: 0.3pF≤C1≤1pF; and / or, a capacitance value C2 of the second capacitor satisfies: 0.3pF≤C2≤1pF.

5. The electronic device according to claim 1, wherein: the first capacitor comprises at least one of a lumped capacitor device and a distributed capacitor device; the second capacitor comprises at least one of a lumped capacitor device and a distributed capacitor device.

6. The electronic device according to claim 1, wherein: the first capacitor comprises a first metal layer and a second metal layer, the first metal layer and the second metal layer being spaced apart along a first direction, and projections of the first metal layer and the second metal layer on a plane in which the floor is located along the first direction at least partially overlap, the first metal layer being electrically connected to the first frame at the first feeding point, and the second metal layer being electrically connected to the first feeding unit, the first direction being a direction perpendicular to the plane in which the floor is located. The second capacitor includes a third metal layer and a fourth metal layer, the third metal layer and the fourth metal layer are spaced apart along the first direction, and projections of the third metal layer and the fourth metal layer on a plane on which the floor is located at least partially overlap along the first direction, the third metal layer is electrically connected with the first frame at a second feeding point, and the fourth metal layer is electrically connected with the second feeding unit.

7. The electronic device of claim 6, wherein, The antenna further includes an inductor; a first end of the inductor is electrically connected with the second metal layer, and a second end of the inductor is electrically connected with the fourth metal layer.

8. The electronic device of claim 1, When the first feeding unit is fed, the antenna generates a first resonance and a second resonance, a resonance frequency of the first resonance is lower than a resonance frequency of the second resonance; a length of the first frame between the first feeding point and the first grounding point is less than or equal to one eighth of a first wavelength, the first wavelength being a wavelength corresponding to the first resonance; a length of the first frame between the second feeding point and the first grounding point is less than or equal to one eighth of the first wavelength.

9. The electronic device of any one of claims 1 to 8, The frame further has a third position and a fourth position, a frame between the second position and the fourth position is a second frame, the second frame including the first frame, and the third position is between the fourth position and the first position; The frame is grounded at the third position, and a gap is provided at the fourth position; The antenna includes a second frame, a frame between the third position and the fourth position includes a second grounding point, a third feeding point, and a fourth feeding point, the third feeding point being between the second grounding point and the third position, and the fourth feeding point being between the second grounding point and the fourth position.

10. The electronic device of claim 9, When the first feeding unit is fed, the antenna generates a first resonance and a second resonance, a resonance frequency of the first resonance is lower than a resonance frequency of the second resonance; a length of the frame between the first position and the third position is greater than or equal to one fifth of a first wavelength and less than or equal to one half of the first wavelength, the first wavelength being a wavelength corresponding to the first resonance.

11. An electronic device, comprising: including: a floor; a conductive frame having a first position and a second position on the frame, the frame being grounded at the first position, a gap being provided at the second position, and a frame between the first position and the second position being a first frame; an antenna including the first frame, the first frame including a first grounding point, a first feeding point, and a second feeding point, the first feeding point being between the first grounding point and the first position, and the second feeding point being between the first grounding point and the second position; wherein the antenna further includes a first feeding unit and a second feeding unit, the first feeding unit being electrically connected with the first frame at a first feeding point, and the second feeding unit being electrically connected with the first frame at a second feeding point. The antenna generates a first resonance and a second resonance when the first feeding unit feeds, a resonance frequency of the first resonance is lower than a resonance frequency of the second resonance, the antenna generates a third resonance and a fourth resonance when the second feeding unit feeds, a resonance frequency band of the first resonance is same as a resonance frequency band of the third resonance, and a resonance frequency band of the second resonance is same as a resonance frequency band of the fourth resonance. A length L1 of a first border between the first position and the first grounding point and a length L2 of the first border between the second position and the first grounding point satisfy: 1.8≤L1 / L2≤2.

2. 12.The electronic device of claim 11, wherein, The antenna further comprises a first capacitor and a second capacitor. A first end of the first capacitor is electrically connected to the first border at a first feeding point, and a second end of the first capacitor is electrically connected to the first feeding unit. A first end of the second capacitor is electrically connected to the first border at a second feeding point, and a second end of the second capacitor is electrically connected to the second feeding unit.

13. The electronic device of claim 11, wherein, A frequency ratio of a resonance frequency f1 of the first resonance and a resonance frequency f2 of the second resonance satisfies: 1.1≤f2 / f1≤1.

5. 14.The electronic device of claim 12, wherein, A capacitance value C1 of the first capacitor satisfies: 0.3pF≤C1≤1pF; and / or, A capacitance value C2 of the second capacitor satisfies: 0.3pF≤C2≤1pF. 15.The electronic device of claim 12, wherein, The first capacitor comprises at least one of a lumped capacitor device and a distributed capacitor device. The second capacitor comprises at least one of a lumped capacitor device and a distributed capacitor device. 16.The electronic device of claim 12, wherein, The first capacitor comprises a first metal layer and a second metal layer, the first metal layer and the second metal layer are spaced apart along a first direction, and projections of the first metal layer and the second metal layer on a plane where the ground plane is located along the first direction at least partially overlap, the first metal layer is electrically connected to the first border at a first feeding point, and the second metal layer is electrically connected to the first feeding unit, the first direction being a direction perpendicular to the plane where the ground plane is located. The second capacitor comprises a third metal layer and a fourth metal layer, the third metal layer and the fourth metal layer are spaced apart along the first direction, and projections of the third metal layer and the fourth metal layer on the plane where the ground plane is located along the first direction at least partially overlap, the third metal layer is electrically connected to the first border at a second feeding point, and the fourth metal layer is electrically connected to the second feeding unit. 17.The electronic device of claim 16, wherein, The antenna further comprises an inductor; A first end of the inductor is electrically connected to the second metal layer, and a second end of the inductor is electrically connected to the fourth metal layer. 18.The electronic device of claim 11, wherein, A length of the first border between the first feeding point and the first grounding point is less than or equal to one eighth of a first wavelength corresponding to the first resonance. A length of the first border between the second feeding point and the first grounding point is less than or equal to one eighth of the first wavelength.

19. The electronic device of any one of claims 11-18, The border further has a third position and a fourth position, a border between the second position and the fourth position is a second border, the second border includes the first border, and the third position is between the fourth position and the first position. The border is grounded at the third position, and the fourth position is provided with a gap. The antenna includes a second border, a border between the third position and the fourth position includes a second grounding point, a third feeding point between the second grounding point and the third position, and a fourth feeding point between the second grounding point and the fourth position.

20. The electronic device of claim 19, When the first feeding unit feeds, the antenna generates a first resonance and a second resonance, a resonance frequency of the first resonance is lower than a resonance frequency of the second resonance. A length of the border between the first position and the third position is greater than or equal to one fifth of a first wavelength and less than or equal to one half of the first wavelength, the first wavelength being a wavelength corresponding to the first resonance.

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