Electronic device

Abstract

An electronic device, which aims to address the problem of relatively low circularly polarized signal gain of antennas. In the electronic device, a first antenna is disposed on a third frame, the first antenna comprising: a first branch, a second branch, a grounding structure, and a matching circuit, the first branch being closer to a first frame than the second branch; the first branch is provided with a feed point, the matching circuit being coupled to the feed point, the matching circuit being configured for enabling the first branch to generate a first resonance, and the matching circuit being further configured for enabling the second branch to generate a second resonance; a second antenna is disposed on the first frame and / or a second frame, and the first antenna is configured for coupling a signal to the second antenna, so that the second antenna generates a first parasitic resonance, wherein both the first parasitic resonance and the first resonance are circularly polarized signals, and a polarization direction of the first parasitic resonance is the same as a polarization direction of the first resonance, thereby increasing circularly polarized signal gain (circular polarization gain) and improving communication performance in electronic devices.

Description

electronic devices

[0001] This application claims priority to Chinese patent application filed on October 23, 2024, with application number 202411488161.X and entitled "Electronic Device", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of communication technology, specifically to an electronic device. Background Technology

[0003] Electronic devices (such as mobile phones and tablets) typically have antennas, which are generally configured to generate circularly polarized signals to communicate with satellites and improve the performance of the electronic devices. However, the gain of the circularly polarized signal of the antenna is generally low, resulting in poor communication between the electronic devices and satellites. Summary of the Invention

[0004] This application provides an electronic device that can improve the circular polarization signal gain of an antenna, thereby improving the communication effect between the electronic device and a satellite.

[0005] This application provides an electronic device, including: a mid-frame, a ground plane, a first antenna, and a second antenna. The mid-frame includes a first side frame, a second side frame, and a third side frame. The first and second side frames are parallel and spaced apart. The third side frame is disposed between the first and second side frames and is perpendicular to both the first and second side frames. The first, second, and third side frames enclose a preset area, and the ground plane is disposed within the preset area. The first antenna is disposed on the third side frame and includes: a first stub, a second stub, a grounding structure, and a matching circuit. The grounding structure is disposed between the first and second stubs. One end of each of the first and second stubs is coupled to a grounding stub, and the grounding structure is coupled to the ground. The first stub is closer to the first frame than the second stub. A feed point is provided on the first stub, and a matching circuit is coupled to the feed point. The matching circuit is used to generate a first resonance in the first stub, and the matching circuit is also used to generate a second resonance in the second stub. The second antenna is provided on the first frame and / or the second frame. The first antenna is used to couple a signal to the second antenna so that the second antenna generates a first parasitic resonance. Both the first parasitic resonance and the first resonance are circularly polarized signals, and the polarization direction of the first parasitic resonance is the same as that of the first resonance.

[0006] With the above settings, the first antenna couples a signal to the second antenna, causing the second antenna to generate a first parasitic resonance. Both the first parasitic resonance and the first resonance are circularly polarized signals, and the polarization direction of the first parasitic resonance is the same as that of the first resonance. This can improve the gain of the circularly polarized signal of the first resonance (circular polarization gain) and improve the communication performance of the electronic device.

[0007] In some embodiments that may include the above-described embodiments, the difference between the resonant frequency of the first resonance and the resonant frequency of the second resonance is greater than or equal to 300MHz. The resonant frequency bands of the first and second resonances can cover different communication frequency bands to increase the bandwidth of the antenna.

[0008] In some embodiments that may include the above embodiments, the second antenna includes a first sub-antenna disposed on a first frame. The third frame includes a first ground frame disposed between the first stub and the first frame, and the first frame includes a second ground frame disposed between the first sub-antenna and the first ground frame. Other antennas may be disposed on the first and second ground frames to improve the structural compactness of the electronic device. The first sub-antenna includes a third stub and a first tuning device. A first gap exists between the third stub and the second ground frame. For example, the end of the third stub facing away from the first gap may be a ground terminal. The ground current can be adjusted through the third stub, thereby making the signal corresponding to the first parasitic resonance a circularly polarized signal. The distance between the third stub and the first ground frame is less than or equal to 30mm (e.g., 30mm, 15mm, 10mm, etc.) so that the circular polarization direction of the first parasitic resonance is the same as the circular polarization direction of the first resonance. For example, the circular polarization directions of the first parasitic resonance and the first resonance are both left-hand circular polarization in front of the screen.

[0009] In the above implementation, one end of the first tuning device is coupled to the third stub, and the other end of the first tuning device is grounded. The resonant frequency of the first parasitic resonance can be adjusted using the first tuning device, thereby making the resonant frequency of the first parasitic resonance close to the resonant frequency of the first resonance, so that the first parasitic resonance and the first resonance cover the same communication frequency band, ensuring that the communication signal in this communication frequency band has a high circular polarization gain. For example, the first tuning device may include a capacitor structure and / or an inductor structure.

[0010] In some embodiments that may include the above examples, the distance between the third branch and the first grounding frame is 15mm ± 5mm. This results in a higher circular polarization gain, further improving the gain of the circular polarization signal and enhancing communication performance.

[0011] In some embodiments that may include the above embodiments, the second antenna includes a second sub-antenna disposed on the second frame, the third frame includes a third ground frame disposed between the second stub and the second frame, the second frame includes a fourth ground frame disposed between the second sub-antenna and the third ground frame, and a fifth ground frame disposed on the side of the second sub-antenna facing away from the fourth ground frame; the second sub-antenna includes a fourth stub and a second tuning device, a second gap is provided between the fourth stub and the fifth ground frame, the end of the fourth stub facing away from the second gap can be a ground end, the ground current can be adjusted through the fourth stub, thereby making the signal corresponding to the first parasitic resonance a circularly polarized signal; the distance between the fourth stub and the third ground frame is less than or equal to 30mm (such as 10mm, 15mm, 20mm, etc.), so that the circular polarization direction of the first parasitic resonance is the same as the circular polarization direction of the first resonance, for example, the circular polarization direction of the first parasitic resonance and the first resonance are both left-hand circular polarization in front of the screen.

[0012] In the above implementation, one end of the second tuning device is coupled to the fourth stub, and the other end of the second tuning device is grounded. The resonant frequency of the first parasitic resonance can be adjusted using the second tuning device, thereby making the resonant frequency of the first parasitic resonance close to the resonant frequency of the first resonance, so that the first parasitic resonance and the first resonance cover the same communication frequency band, ensuring that the communication signal in this communication frequency band has a high circular polarization gain. For example, the second tuning device may include a capacitor structure and / or an inductor structure.

[0013] In some embodiments that may include the above embodiments, the second antenna includes a third sub-antenna disposed on the second frame, the third frame includes a third ground frame disposed between the second stub and the second frame, and the second frame includes a fourth ground frame disposed between the third sub-antenna and the third ground frame; the third sub-antenna includes a fifth stub and a third tuning device, the fifth stub and the fourth ground frame have a third gap, the end of the fifth stub away from the third gap can be a ground end, the ground current can be adjusted through the fifth stub, thereby making the signal corresponding to the first parasitic resonance a circularly polarized signal; the distance between the fifth stub and the third ground frame is greater than or equal to 30mm, so that the circular polarization direction of the first parasitic resonance is the same as the circular polarization direction of the first resonance, for example, the circular polarization direction of the first parasitic resonance and the first resonance are both left-hand circular polarization in front of the screen.

[0014] In the above implementation, one end of the third tuning device is coupled to the fifth stub, and the other end of the third tuning device is grounded. The resonant frequency of the first parasitic resonance can be adjusted using the third tuning device, thereby making the resonant frequency of the first parasitic resonance close to the resonant frequency of the first resonance, so that the first parasitic resonance and the first resonance cover the same communication frequency band, ensuring that the communication signal in this communication frequency band has a high circular polarization gain. For example, the third tuning device may include a capacitor structure and / or an inductor structure; this application embodiment does not limit this.

[0015] In some embodiments that may include the above-described examples, the second antenna may include at least two of a first sub-antenna, a second sub-antenna, and a third sub-antenna to further improve the gain of the circularly polarized signal and enhance communication performance. For example, the second antenna may include a first sub-antenna and a second sub-antenna, or the second antenna may include a first sub-antenna, a second sub-antenna, and a third sub-antenna. Accordingly, each tuning device may be grounded via a switching device or coupled to a corresponding stub via a switching device, and the switching device may control the operation of the corresponding sub-antenna to adjust the circular polarization gain.

[0016] In some embodiments that may include the above embodiments, the difference between the resonant frequency of the first resonance and the resonant frequency of the second resonance is less than or equal to 100MHz, so that the resonant frequency band of the first resonance and the resonant frequency band of the second resonance can cover the same communication frequency band, thereby increasing the bandwidth of the communication frequency band and improving the antenna performance of the second antenna.

[0017] In some embodiments that may include the above embodiments, the second antenna includes a fourth sub-antenna disposed on the first frame; the third frame includes a first ground frame disposed between the first stub and the first frame, the first frame includes a second ground frame disposed between the fourth sub-antenna and the first ground frame, and a sixth ground frame located on the side of the fourth sub-antenna facing away from the second ground frame; the fourth sub-antenna includes a seventh stub and a fourth tuning device, the seventh stub and the sixth ground frame have a fourth gap, the end of the seventh stub facing away from the fourth gap can be a ground end, the ground current can be adjusted through the seventh stub, thereby making the signal corresponding to the first parasitic resonance a circularly polarized signal; the distance between the seventh stub and the first ground frame is less than or equal to 30mm, so that the circular polarization direction of the first parasitic resonance is the same as the circular polarization direction of the first resonance, for example, the circular polarization direction of the first parasitic resonance and the first resonance are both rear-screen left-hand circular polarization.

[0018] In the above implementation, one end of the fourth tuning device is coupled to the seventh stub, and the other end of the fourth tuning device is grounded. The fourth tuning device can adjust the resonant frequency of the first parasitic resonance, thereby making the resonant frequency of the first parasitic resonance close to the resonant frequency of the first resonance, so that the first parasitic resonance and the first resonance cover the same communication frequency band, ensuring that the communication signal in this communication frequency band has a high circular polarization gain. For example, the fourth tuning device may include a capacitor structure and / or an inductor structure.

[0019] In some embodiments that may include the above embodiments, the second antenna includes a fifth sub-antenna disposed on the first frame; the third frame includes a first ground frame disposed between the first stub and the first frame, and the first frame includes a second ground frame disposed between the fifth sub-antenna and the first ground frame; the fifth sub-antenna includes an eighth stub and a fifth tuning device, and there is a fifth gap between the eighth stub and the second ground frame. The end of the eighth stub away from the fifth gap can be a ground end. The ground current can be adjusted through the eighth stub, thereby making the signal corresponding to the first parasitic resonance a circularly polarized signal; the distance between the eighth stub and the first ground frame is greater than or equal to 30mm (such as 60mm, 50mm, 35mm, 30mm, etc.) so that the circular polarization direction of the first parasitic resonance is the same as the circular polarization direction of the first resonance. For example, the circular polarization directions of the first parasitic resonance and the first resonance are both left-hand circular polarization behind the screen.

[0020] In the above implementation, one end of the fifth tuning device is coupled to the eighth stub, and the other end of the fifth tuning device is grounded. The fifth tuning device can adjust the resonant frequency of the first parasitic resonance, thereby making the resonant frequency of the first parasitic resonance close to the resonant frequency of the first resonance, so that the first parasitic resonance and the first resonance cover the same communication frequency band, ensuring that the communication signal in this communication frequency band has a high circular polarization gain. For example, the fifth tuning device may include a capacitor structure and / or an inductor structure.

[0021] In some embodiments that may include the above embodiments, the distance between the eighth branch and the first grounding frame is greater than or equal to 45mm and less than or equal to 60mm, so as to further improve the circular polarization gain and improve communication performance.

[0022] In some embodiments that may include the above embodiments, the second antenna includes a sixth sub-antenna disposed on the second frame, the third frame includes a third ground frame disposed between the second stub and the second frame, and the second frame includes a fourth ground frame disposed between the sixth sub-antenna and the third ground frame; the sixth sub-antenna includes a ninth stub and a sixth tuning device, the ninth stub and the fourth ground frame have a sixth gap, the end of the ninth stub away from the sixth gap can be a ground end, the ground current can be adjusted through the ninth stub, thereby making the signal corresponding to the first parasitic resonance a circularly polarized signal; the distance between the ninth stub and the third ground frame is less than or equal to 30mm, so that the circular polarization direction of the first parasitic resonance is the same as the circular polarization direction of the first resonance, for example, the circular polarization direction of the first parasitic resonance and the first resonance are both rear-screen left-hand circular polarization.

[0023] In the above implementation, one end of the sixth tuning device is coupled to the ninth stub, and the other end of the sixth tuning device is grounded. The resonant frequency of the first parasitic resonance can be adjusted using the sixth tuning device, thereby making the resonant frequency of the first parasitic resonance close to the resonant frequency of the first resonance, so that the first parasitic resonance and the first resonance cover the same communication frequency band, ensuring that the communication signal in this communication frequency band has a high circular polarization gain. For example, the sixth tuning device may include a capacitor structure and / or an inductor structure.

[0024] In some embodiments that may include the above-described embodiments, the second antenna may include at least two of a fourth sub-antenna, a fifth sub-antenna, and a sixth sub-antenna to further improve the gain of the circularly polarized signal and improve communication performance.

[0025] In some embodiments that may include the above-described embodiments, the second antenna may include at least one of a first sub-antenna, a second sub-antenna, a third sub-antenna, and at least one of a fourth sub-antenna, a fifth sub-antenna, and a sixth sub-antenna. Accordingly, each tuning device is grounded via a switching device or coupled to a corresponding stub via a switching device. During operation, the first and second resonances are adjusted via the first and second tuning components to ensure that the signal corresponding to the first resonance is a circularly polarized signal. For example, when the difference between the resonant frequencies of the first and second resonances is greater than or equal to 300MHz, the switching devices corresponding to the fourth, fifth, and sixth sub-antennas are open, and at least one of the switching devices corresponding to the first, second, and third sub-antennas is closed, meaning at least one of the first, second, and third sub-antennas is operational to improve the circular polarization gain. When the difference between the resonant frequencies of the first and second resonances is less than or equal to 100MHz, the switching devices corresponding to the first, second, and third sub-antennas are open, and at least one of the switching devices corresponding to the fourth, fifth, and sixth sub-antennas is closed, meaning at least one of the fourth, fifth, and sixth sub-antennas is operational to improve the circular polarization gain. In this way, the electronic device can switch between different communication frequency bands. Attached Figure Description

[0026] Figure 1 is a schematic diagram of the structure of the electronic device provided in an embodiment of this application;

[0027] Figure 2 is a schematic diagram of the structure of the electronic device provided in an embodiment of this application;

[0028] Figure 3 is a schematic diagram of the structure of the first antenna and the second antenna in the electronic device provided in the embodiment of this application;

[0029] Figure 4 is a schematic diagram of the structure of the first antenna and the second antenna in the electronic device provided in the embodiment of this application;

[0030] Figure 5 is a schematic diagram of the structure of the first antenna and the second antenna in the electronic device provided in the embodiment of this application;

[0031] Figure 6 is a schematic diagram of the structure of the first antenna and the second antenna in the electronic device provided in the embodiment of this application;

[0032] Figure 7 is a schematic diagram of the structure of the first antenna and the second antenna in the electronic device provided in the embodiment of this application;

[0033] Figure 8 is a schematic diagram of the structure of the first antenna and the second antenna in the electronic device provided in the embodiment of this application;

[0034] Figure 9 is a schematic diagram of the structure of the first antenna and the second antenna in the electronic device provided in the embodiment of this application;

[0035] Figure 10 is a schematic diagram of the structure of the first antenna and the second antenna in the electronic device provided in the embodiment of this application;

[0036] Figure 11 is a schematic diagram of the structure of the first antenna and the second antenna in the electronic device provided in the embodiment of this application;

[0037] Figure 12 is a schematic diagram of the structure of the first antenna and the second antenna in the electronic device provided in the embodiment of this application;

[0038] Figure 13 is a schematic diagram of the antenna structure corresponding to the line common-mode mode;

[0039] Figure 14 shows the current and electric field distribution of the antenna structure in Figure 13;

[0040] Figure 15 is a schematic diagram of the antenna structure corresponding to the line differential mode;

[0041] Figure 16 shows the current and electric field distribution of the antenna structure in Figure 15;

[0042] Figure 17 is a schematic diagram of the antenna structure corresponding to the slot common-mode mode;

[0043] Figure 18 shows the current and electric field distribution of the antenna structure in Figure 17;

[0044] Figure 19 is a schematic diagram of the antenna structure corresponding to the slot differential mode;

[0045] Figure 20 shows the current and electric field distribution of the antenna structure in Figure 19.

[0046] Explanation of reference numerals in the attached drawings: 10: Middle frame; 101: Display panel; 102: Back cover; 103: Main board; 104: Hinge structure; 110: First frame; 111: Second ground frame; 112: Sixth ground frame; 120: Second frame; 121: Fourth ground frame; 130: Third frame; 131: First ground frame; 132: Third ground frame; 1301: First sub-frame; 1302: Second sub-frame; 20: First antenna; 210: First stub; 220: Second stub; 222: Fifth ground frame; 230: Grounding structure; 240: First tuning component; 250: Second tuning component; 260: Feed point; 30: Second antenna; 310: First sub-antenna; 311: Third stub; 312: First slot; 313: First tuning device; 320: Second sub-antenna; 321: Fourth stub; 322: Second slot; 323: Second tuning device; 330: Third sub-antenna; 331: Fifth stub; 332: Third slot; 333: Third tuning device; 340: Fourth sub-antenna; 341: Seventh stub; 342: Fourth slot; 343: Fourth tuning device; 350: Fifth sub-antenna; 351: Eighth stub; 352: Fifth slot; 353: Fifth tuning device; 360: Sixth sub-antenna; 361: Ninth stub; 362: Sixth slot; 363: Sixth tuning device. Detailed Implementation

[0047] The technical solutions of the embodiments of this application will be described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0048] Hereinafter, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature.

[0049] Furthermore, in the embodiments of this application, directional terms such as "up," "down," "left," "right," "horizontal," and "vertical" are defined relative to the orientation of the components shown in the accompanying drawings. It should be understood that these directional terms are relative concepts, used for relative description and clarification, and can change accordingly depending on the orientation of the components in the accompanying drawings.

[0050] The following explains the terminology that may appear in the embodiments of this application.

[0051] Connection / Link: should be interpreted broadly. For example, "connection" can be a fixed connection, an electrical connection, a detachable connection, or an integral part; it can be a direct connection or an indirect connection through an intermediate medium.

[0052] Coupling can be understood as direct coupling and / or indirect coupling. "Coupled connection" can be understood as a direct coupling connection and / or indirect coupling connection. Direct coupling can also be called "electrical connection," which can be understood as physical contact and electrical conduction between components; it can also be understood as the form of connection between different components in a circuit structure through physical lines that can transmit electrical signals, such as copper foil or wires on a printed circuit board (PCB). "Indirect coupling" can be understood as electrical conduction between two conductors through a gap / non-contact method. In one embodiment, indirect coupling can also be called capacitive coupling, for example, signal transmission is achieved by forming an equivalent capacitance through coupling between the gaps between two conductive parts.

[0053] Relative / Relative Setting: A and B relative setting can refer to A and B being face-to-face. For example, when two radiators are set relative to each other, the two radiators overlap in at least a portion of their area along a certain direction. In one embodiment, the two relatively set radiators are adjacent to each other and there are no other radiators or conductors other than antenna structures between them.

[0054] Lumped element / device: This refers to all components whose size is much smaller than the wavelength relative to the circuit's operating frequency. For signals, the characteristics of the components remain constant at all times, regardless of frequency.

[0055] Distributed elements / devices: Unlike lumped elements, if the size of an element is similar to or larger than the wavelength of the circuit's operating frequency, then when a signal passes through the element, the characteristics of each point on the element will vary due to the signal change. In this case, the element as a whole cannot be regarded as a single entity with fixed characteristics, but should be called a distributed element.

[0056] Capacitor / Capacitor Structure: This can be understood as lumped capacitance and / or distributed capacitance. Lumped capacitance refers to capacitive components, such as capacitor elements; distributed capacitance (or distributed capacitance) refers to the equivalent capacitance formed by two conductive components separated by a certain gap.

[0057] Inductance / Inductor Structure: Can be understood as lumped inductance and / or distributed inductance. Lumped inductance refers to inductive components, such as inductor elements; distributed inductance (or distributed inductance) refers to the equivalent inductance formed through a conductive element of a certain length, such as the equivalent inductance formed by a conductor due to curling or rotation.

[0058] A power supply circuit is a combination of all circuits used for receiving and transmitting radio frequency (RF) signals. It can include a transceiver and an RF front-end. In some cases, the term "power supply circuit" is narrowly interpreted as an RF IC (Radio Frequency Integrated Circuit), which can be considered to include both the RF front-end chip and the transceiver. The power supply circuit has the function of converting radio waves (e.g., RF signals) into electrical signals (e.g., digital signals). It is generally considered part of the RF component.

[0059] In some embodiments, the radio frequency front-end circuit can be integrated into a radio frequency front-end chip in an electronic device, or the radio frequency front-end circuit and the transceiver can be integrated into a radio frequency chip in an electronic device.

[0060] A matching circuit is a circuit used to adjust the radiation characteristics of an antenna. In one embodiment, the matching circuit is coupled between the feed circuit and the corresponding radiator. In another embodiment, the matching circuit is coupled between the test mount and the radiator. Typically, the matching circuit is a combination of circuits coupled between the radiator and the ground plane. In one embodiment, the matching circuit may include a tuning circuit and / or electronic components, which may be electronic components for switching the coupling connection of the radiator. The matching circuit has impedance matching and / or frequency tuning functions. It is typically considered part of the antenna.

[0061] Radiator / Antenna Stub: A stub in an antenna is a device used to receive / transmit electromagnetic wave radiation. In some cases, the term "antenna" is narrowly defined as a radiator, which converts guided wave energy from the transmitter into radio waves, or converts radio waves into guided wave energy, for radiating and receiving radio waves. The modulated high-frequency current energy (or guided wave energy) generated by the transmitter is transmitted to the transmitting radiator via a feed line, where it is converted into electromagnetic wave energy of a certain polarization and radiated in the desired direction. The receiving radiator converts electromagnetic wave energy of a certain polarization from a specific direction in space back into modulated high-frequency current energy, which is then transmitted to the receiver input via a feed line.

[0062] The radiator / antenna stub / stub may include conductors with specific shapes and sizes, such as wires or sheets, and this application does not limit the specific shape. In one embodiment, the wire radiator may be simply referred to as a wire antenna. In one embodiment, the wire radiator may be implemented by a conductive frame, and may also be referred to as a frame antenna. In one embodiment, the wire radiator may be implemented by a support conductor, and may also be referred to as a support antenna. In one embodiment, the wire diameter (e.g., including thickness and width) of the wire radiator, or the radiator of the wire antenna, is much smaller than the wavelength (e.g., the wavelength of the medium) (e.g., less than 1 / 16 of the wavelength), and the length may be comparable to the wavelength (e.g., the wavelength of the medium) (e.g., a length of about 1 / 8 of the wavelength, or 1 / 8 to 1 / 4, or 1 / 4 to 1 / 2, or longer).

[0063] Radiator / antenna stubs may also include slots or gaps formed on a conductor, for example, closed or semi-closed slots or gaps formed on a grounded conductor surface. In one embodiment, a slotted or slit radiator may be simply referred to as a slot antenna or a gap antenna. In one embodiment, the radial dimension (e.g., including width) of the slot or gap of the slot antenna / gap antenna is much smaller than the wavelength (e.g., the dielectric wavelength) (e.g., less than 1 / 16 of the wavelength), while the length dimension may be comparable to the wavelength (e.g., the dielectric wavelength) (e.g., a length of approximately 1 / 8 of the wavelength, or 1 / 8 to 1 / 4, or 1 / 4 to 1 / 2, or longer). In one embodiment, a radiator with a closed slot or gap may be simply referred to as a closed slot antenna. In one embodiment, a radiator with a semi-closed slot or gap (e.g., an opening added to a closed slot or gap) may be simply referred to as an open slot antenna. In some embodiments, the gap shape is elongated. In some embodiments, the length of the gap is approximately half a wavelength (e.g., the dielectric wavelength). In some embodiments, the length of the gap is approximately an integer multiple of a wavelength (e.g., one dielectric wavelength).

[0064] Ground / Plug: This can broadly refer to at least a portion of any grounding layer, ground plane, or grounding metal layer within an electronic device (such as a mobile phone), or at least a portion of any combination of the aforementioned grounding layers, ground planes, or grounding components. "Ground / Plug" can be used for grounding components within an electronic device. In one embodiment, "Ground / Plug" may include any one or more of the following: a grounding layer of a circuit board of an electronic device, a ground plane formed by the frame of the electronic device, a grounding metal layer formed by a thin metal film beneath the screen, a conductive grounding layer of a battery, and conductive or metallic components electrically connected to the aforementioned grounding layer / ground plane / metal layer. In one embodiment, the circuit board may be a printed circuit board (PCB), such as an 8-layer, 10-layer, or 12-14-layer board having 8, 10, 12, 13, or 14 layers of conductive material, or components separated and electrically insulated by dielectric or insulating layers such as glass fiber or polymers. In one embodiment, the circuit board includes a dielectric substrate, a grounding layer, and a trace layer, with the trace layer and grounding layer electrically connected via vias. In one embodiment, components such as displays, touchscreens, input buttons, transmitters, processors, memory, batteries, charging circuits, and system-on-chip (SoC) architectures can be mounted on or connected to a circuit board; or electrically connected to trace layers and / or ground layers in the circuit board. For example, a radio frequency source is disposed on a trace layer.

[0065] Any of the aforementioned grounding layers, ground planes, or grounding metal layers are made of conductive materials. In one embodiment, the conductive material may be any of the following: copper, aluminum, stainless steel, brass and their alloys, copper foil on an insulating substrate, aluminum foil on an insulating substrate, gold foil on an insulating substrate, silver-plated copper, silver-plated copper foil on an insulating substrate, silver foil on an insulating substrate and tin-plated copper, graphite-impregnated cloth, graphite-coated substrates, copper-plated substrates, brass-plated substrates, and aluminum-plated substrates. Those skilled in the art will understand that grounding layers / ground planes / grounding metal layers may also be made of other conductive materials.

[0066] Grounding: refers to coupling with the aforementioned ground / floor in any way. In one embodiment, grounding can be achieved through physical grounding, such as through a structural component of the mid-frame to achieve a physical ground at a specific location on the frame (or, physical ground). In another embodiment, grounding can be achieved through device grounding, such as through devices like capacitors / inductors / resistors connected in series or parallel (or, device ground).

[0067] Resonant frequency: The resonant frequency is also called the resonance frequency. The resonant frequency can have a frequency range, that is, the frequency range where resonance occurs. The resonant frequency can be a frequency range where the return loss characteristic is less than -6dB. The frequency corresponding to the strongest resonance point is the center frequency (resonant point). The return loss characteristic of the center frequency can be less than -20dB. It should be understood that, unless otherwise specified, the "first resonance" generated by the antenna / radiator mentioned in this application refers to the fundamental mode resonance generated by the antenna / radiator, or in other words, the lowest frequency resonance generated by the antenna / radiator.

[0068] Resonant frequency band: The range of resonant frequencies is the resonant frequency band. The return loss characteristics at any frequency point within the resonant frequency band can be less than -6dB or -5dB.

[0069] Communication / Operating Frequency Band: Regardless of the type of antenna, it always operates within a certain frequency range (bandwidth). For example, an antenna supporting the B40 band operates within the frequency range of 2300MHz to 2400MHz, or in other words, its operating frequency band includes the B40 band. The frequency range that meets the specifications can be considered the antenna's operating frequency band. The width of the operating frequency band is called the operating bandwidth. The operating bandwidth of an omnidirectional antenna may reach 3-5% of the center frequency. The operating bandwidth of a directional antenna may reach 5-10% of the center frequency. Bandwidth can be considered as a frequency range on both sides of the center frequency (e.g., the resonant frequency of a dipole), where the antenna characteristics are within the acceptable range of the center frequency.

[0070] The resonant frequency band and the operating frequency band can be the same or can partially overlap. In one embodiment, one or more resonant frequency bands of the antenna can cover one or more operating frequency bands of the antenna.

[0071] Electrical length: Electrical length can be expressed as the ratio of physical length (i.e., mechanical length or geometric length) multiplied by the time it takes for an electrical or electromagnetic signal to travel in a medium to the time required for that signal to travel a distance in free space equal to the physical length of the medium. Electrical length can be expressed by the following formula:

[0072] Where L is the physical length, a is the transmission time of the electrical or electromagnetic signal in the medium, and b is the transmission time in free space.

[0073] Alternatively, electrical length can also refer to the ratio of physical length (i.e., mechanical length or geometric length) to the wavelength of the transmitted electromagnetic wave, and electrical length can satisfy the following formula:

[0074] Where L is the physical length and λ is the wavelength of the electromagnetic wave.

[0075] In some embodiments of this application, the physical length of the radiator / stub can be understood as within ±20%, ±10%, or ±5% of the electrical length of the radiator / stub.

[0076] In the embodiments of this application, the wavelength in a certain wavelength mode of the antenna (such as a half-wavelength mode) can refer to the wavelength of the signal radiated by the antenna. For example, the half-wavelength mode of a suspended metal antenna can generate resonance in the 1.575 GHz band, where the wavelength in the half-wavelength mode refers to the wavelength of the signal radiated by the antenna in the 1.575 GHz band.

[0077] The wavelength / operating wavelength can be the wavelength corresponding to the center frequency of the resonant frequency or the center frequency of the operating frequency band supported by the antenna. For example, assuming the center frequency of the B1 uplink band (resonant frequency of 1920MHz to 1980MHz) is 1955MHz, then the operating wavelength can be the wavelength calculated using this frequency. Not limited to the center frequency, "operating wavelength" can also refer to the wavelength corresponding to the resonant frequency or a non-center frequency of the operating frequency band.

[0078] End / Point: In the context of antenna radiators / stubs, "end / point" should not be narrowly interpreted as necessarily an endpoint or end physically disconnected from other radiators. It can also refer to a point or segment on a continuous radiator, such as a segment near the corresponding end / point (e.g., an area within 5mm). In one embodiment, "end / point" can include a connection / coupling area on the antenna radiator that couples to other conductive structures. For example, a feed end / feed point can be a coupling area on the antenna radiator that couples to a feed structure or feed circuit (e.g., an area facing a part of the feed circuit). Similarly, a ground end / grounding point can be a connection / coupling area on the antenna radiator that couples to a ground structure or ground circuit.

[0079] The terms collinearity, coaxiality, coplanarity, symmetry (e.g., axial symmetry, or central symmetry), parallelism, perpendicularity, and similarity (e.g., same length, same width, etc.) mentioned in the embodiments of this application are all relative to the current technological level, and not absolute and strict mathematical definitions. There may be a deviation of less than a predetermined threshold (e.g., 1 mm, 0.5 mm, or 0.1 mm) between the edges of two collinear radiating stubs or two antenna elements in the line width direction. There may be a deviation of less than a predetermined threshold between the edges of two coplanar radiating stubs or two antenna elements in the direction perpendicular to their coplanar plane. There may be a deviation of a predetermined angle between two parallel or perpendicular antenna elements. In one embodiment, the predetermined threshold may be less than or equal to a threshold of 1 mm, for example, the predetermined threshold may be 0.5 mm or 0.1 mm. In one embodiment, the predetermined angle may be an angle within the range of ±10°, for example, the predetermined angle deviation is ±5°.

[0080] The current-in-the-direction (in-the-direction) / reverse-direction distribution mentioned in the embodiments of this application should be understood as the main currents on conductors on the same side being in the same direction / reverse direction. For example, when a current-in-the-direction distribution is excited on a conductor that is bent or looped (e.g., the current path is also bent or looped), it should be understood that, for example, the main currents excited on the conductors on both sides of a looped conductor (e.g., on the conductors on both sides of a gap) are in opposite directions in terms of direction, but they still fall under the definition of current-in-the-direction distribution in this application. In one embodiment, current-in-the-direction on a conductor can mean that the current on that conductor has no reverse point. In one embodiment, current-reverse on a conductor can mean that the current on that conductor has at least one reverse point. In one embodiment, current-in-the-direction on two conductors can mean that the currents on both conductors have no reverse points and flow in the same direction. In one embodiment, current-reverse on two conductors can mean that the currents on both conductors have no reverse points and flow in opposite directions. Current-in-the-direction / reverse-direction on multiple conductors can be understood accordingly.

[0081] Antenna pattern: also known as radiation pattern. It refers to the graph showing how the relative field strength (normalized modulus) of the antenna's radiated field changes with direction at a certain distance from the antenna. It is usually represented by two mutually perpendicular planar patterns passing through the direction of maximum radiation of the antenna.

[0082] Antenna radiation patterns typically have multiple radiating beams. The beam with the highest radiating intensity is called the main lobe, and the remaining beams are called side lobes. Among the side lobes, the side lobe in the opposite direction to the main lobe is also called the back lobe.

[0083] Beamwidth: Divided into horizontal beamwidth and vertical beamwidth. Horizontal beamwidth refers to the angle between two directions on either side of the direction of maximum radiation, where the radiated power decreases by 3dB. Vertical beamwidth refers to the angle between two directions on either side of the direction of maximum radiation, where the radiated power decreases by 3dB.

[0084] Antenna gain: Characterizes the degree to which an antenna concentrates the radiated input power. Generally, the narrower the main lobe and the smaller the side lobes of the antenna pattern, the higher the antenna gain.

[0085] System efficiency (total efficiency) refers to the ratio of the power radiated into space by the antenna (i.e., the power effectively converted into electromagnetic waves) to the antenna's input power. System efficiency is the actual efficiency after considering antenna port matching; that is, the system efficiency of an antenna is its actual efficiency (i.e., overall efficiency).

[0086] Radiation efficiency refers to the ratio of the power radiated by an antenna into space (i.e., the power effectively converted into electromagnetic waves) to the active power input to the antenna. The active power input to the antenna equals the antenna's input power minus the power loss. Power loss mainly includes return loss power, ohmic loss power of the metal, and / or dielectric loss power. Both metal loss and dielectric loss are factors affecting radiation efficiency.

[0087] Those skilled in the art will understand that efficiency is generally expressed as a percentage, and there is a corresponding conversion relationship between it and dB. The closer the efficiency is to 0dB, the better the efficiency of the antenna.

[0088] dB: This stands for decibel, a logarithmic concept with base 10. Decibels are used to evaluate the proportional relationship between two physical quantities; they themselves have no physical dimensions. For every 10-fold increase in the ratio between two quantities, their difference can be expressed as 10 decibels. For example: A = 100, B = 10, C = 5, D = 1, then A / D = 20 dB; B / D = 10 dB; C / D = 7 dB; B / C = 3 dB. In other words, a 10-decibel difference between two quantities is a 10-fold difference, a 20-decibel difference is a 100-fold difference, and so on. A 3-decibel difference is a 2-fold difference between the two quantities.

[0089] dBi: Usually mentioned together with dBd. dBi and dBd are units of power gain, both relative values, but with different reference points. The reference point for dBi is an omnidirectional antenna; the reference point for dBd is a dipole. Generally, dBi and dBd are considered to represent the same gain, but the value expressed in dBi is 2.15 dBi larger than that expressed in dBd. For example, for an antenna with a gain of 16 dBd, its gain converted to dBi is 18.15 dBi, generally ignoring the decimal places, hence 18 dBi.

[0090] Antenna return loss: This can be understood as the ratio of the signal power reflected back to the antenna port after passing through the antenna circuit to the transmit power at the antenna port. The smaller the reflected signal, the larger the signal radiated into space through the antenna, and the higher the antenna's radiation efficiency. Conversely, the larger the reflected signal, the smaller the signal radiated into space through the antenna, and the lower the antenna's radiation efficiency.

[0091] Antenna return loss can be represented by the S11 parameter, which is one of the S-parameters. S11 represents the reflection coefficient, and this parameter characterizes the antenna's transmission efficiency.

[0092] In one embodiment, the S11 diagram can be understood as a schematic diagram representing the resonance generated by the antenna. In one embodiment, the resonance shown in the S11 diagram within the range of -6dB can be understood as the resonant frequency / frequency range / operating frequency band generated by the antenna. The S11 parameter is usually negative. The smaller the S11 parameter, the smaller the antenna return loss, the less energy reflected back by the antenna itself, which means more energy actually enters the antenna, and the higher the system efficiency of the antenna. The larger the S11 parameter, the greater the antenna return loss, and the lower the system efficiency of the antenna.

[0093] It should be noted that in engineering, an S11 value of -6dB is generally used as the standard. When the S11 value of an antenna is less than -6dB, the antenna can be considered to be working normally, or the antenna can be considered to have good transmission efficiency.

[0094] Antenna radiation pattern: also known as radiation pattern. It refers to the graph showing the relative field strength (normalized modulus) of the antenna's radiated field as a function of direction at a certain distance from the antenna (far field). It is usually represented by two mutually perpendicular planar radiation patterns passing through the direction of maximum radiation of the antenna.

[0095] Antenna radiation patterns typically have multiple radiating beams. The beam with the highest radiating intensity is called the main lobe, and the remaining beams are called side lobes. Among the side lobes, the side lobe in the opposite direction to the main lobe is also called the back lobe.

[0096] Directivity: Also known as the antenna's directivity. It refers to the ratio of the maximum power density to the average power density on the antenna's radiation pattern at a certain distance from the antenna (far field), and is a dimensionless ratio greater than or equal to 1. It can be used to indicate the energy radiation characteristics of an antenna. The larger the directivity, the more energy the antenna radiates in a particular direction, and the more concentrated the energy radiation is.

[0097] Antenna gain: Characterizes the degree to which an antenna concentrates the radiated input power. Generally, the narrower the main lobe and the smaller the side lobes of the antenna pattern, the higher the antenna gain.

[0098] Antenna polarization: At a given point in space, the electric field intensity E (vector) is a function of time t. As time progresses, the endpoint of the vector periodically traces a trajectory in space. If this trajectory is a straight line and perpendicular to the ground, it is called vertical polarization; if it is horizontal to the ground, it is called horizontal polarization. If the trajectory is elliptical or circular, and when viewed along the propagation direction, it rotates clockwise or right-handed with time, it is called right-hand circular polarization (RHCP); if it rotates counterclockwise or left-handed with time, it is called left-hand circular polarization (LHCP).

[0099] The technical solutions of the embodiments of this application will now be described with reference to the accompanying drawings.

[0100] This application provides an electronic device, which may include a mobile phone, tablet computer, laptop computer, remote information processor, etc. The electronic device includes an antenna structure (antenna), which enables wireless communication between the electronic device and communication base stations, other electronic devices, satellites, etc.

[0101] Referring to Figure 1, in some embodiments, the electronic device may include a non-foldable electronic device. The following description uses a mobile phone (non-foldable mobile phone) as an example. For instance, the mobile phone includes a mid-frame 10, a display panel 101, and a motherboard 103. The mid-frame 10 encloses a preset area, the motherboard 103 is disposed within the preset area, and the display panel 101 covers the mid-frame 10. The display panel 101 is electrically connected to the motherboard 103 so that the motherboard 103 controls the display panel 101 to display images.

[0102] In some implementations, the electronic device also includes a cover plate, a back cover 102, and a battery (not shown). The cover plate covers the side of the display panel 101 opposite to the mid-frame 10, protecting the display panel 101 from damage caused by external objects. The back cover 102 covers the side of the mid-frame 10 opposite to the display panel 101. The battery is located in a preset area and is electrically connected to the motherboard 103 to supply power to the motherboard 103.

[0103] In the above implementation, the middle frame 10 includes a first border 110, a second border 120, and a third border 130. The first border 110 and the second border 120 are parallel and spaced apart, and the third border 130 is located between the first border 110 and the second border 120. The third border 130 is perpendicular to both the first border 110 and the second border 120. The third border 130 can be a border that faces roughly towards the sky during use (such as making or receiving phone calls or sending / receiving video calls), while the first border 110 and the second border 120 are borders that are roughly perpendicular to the ground during use.

[0104] Referring to Figure 2, in some embodiments, the electronic device includes a foldable electronic device, such as a foldable mobile phone, a foldable tablet computer, etc. Exemplarily, the foldable electronic device may include a mid-frame 10 and a hinge structure 104. The mid-frame 10 includes a first side frame 110, a second side frame 120, and a third side frame 130. When the foldable electronic device is in the unfolded state, the first side frame 110 and the second side frame 120 are arranged parallel and spaced apart, and the third side frame 130 is disposed between the first side frame 110 and the second side frame 120, and the third side frame 130 is perpendicular to both the first side frame 110 and the second side frame 120. The third side frame 130 may include a first sub-side frame 1301 and a second sub-side frame 1302. The first sub-side frame 1301 and the first side frame 110 are located on one side of the hinge structure 104, and the second sub-side frame 1302 and the second side frame 120 are located on the other side of the hinge structure 104. During folding, the first sub-side frame 1301 and the second sub-side frame 1302 rotate relative to each other. In the unfolded state, the first sub-side frame 1301 and the second sub-side frame 1302 are approximately on the same straight line.

[0105] In the above implementation, the foldable electronic device also includes a flexible display panel and a motherboard. The flexible display panel can cover the first frame 110, the second frame 120, and the third frame 130, and bends accordingly during folding or unfolding. The first frame 110, the second frame 120, and the third frame 130 form a preset area, which includes a first preset area and a second preset area. The first sub-frame 1301 and the first frame 110 form the first preset area, and the second sub-frame 1302 and the second frame 120 form the second preset area. The motherboard can be located in either the first preset area or the second preset area; this application embodiment does not limit this.

[0106] In this embodiment, the electronic device further includes a floor, which is disposed in a preset area. It is understood that the floor may include a grounding layer on the motherboard, a grounding metal film in the display panel, a conductive grounding layer of the battery, etc., and this embodiment does not impose any limitations on this.

[0107] Referring to Figure 3, the electronic device in this embodiment further includes a first antenna 20, which is disposed on the third frame 130. The first antenna 20 is a T-shaped antenna and includes a first stub 210, a second stub 220, a grounding structure 230, and a matching circuit. The grounding structure 230 is disposed between the first stub 210 and the second stub 220. The end of the first stub 210 near the second stub 220 is coupled to the grounding structure 230, and the end of the second stub 220 near the first stub 210 is coupled to the grounding structure 230. A feed point 260 can be disposed on the first stub 210 and coupled to the matching circuit to receive radio frequency signals. It is understood that the first antenna 20 can be integrated with the third frame 130, that is, part of the third frame 130 serves as the first stub 210 and the second stub 220; of course, the first stub 210 and the second stub 220 can also be installed on the third frame 130 by bolt connection or adhesive bonding, etc., and this embodiment does not limit this. The grounding structure 230 is configured to be grounded. This application embodiment does not limit the grounding structure 230. For example, the grounding structure 230 can be a grounded metal sheet, metal column, etc. In the implementation of the electronic device as a foldable electronic device, the first branch 210 can be set on the first sub-frame 1301, the second branch 220 can be set on the second sub-frame 1302, and the grounding structure 230 can include the hinge structure 104.

[0108] In this embodiment, the matching circuit is coupled to the feed point 260. The matching circuit can receive the radio frequency signal from the radio frequency chip and feed the radio frequency signal into the first stub 210, thereby causing the first stub 210 to generate a first resonance. At the same time, the first stub 210 couples a signal to the second stub 220, so that the second stub 220 generates a second resonance. The resonant frequency of the first resonance is not equal to the resonant frequency of the second resonance; for example, the resonant frequency of the first resonance can be greater than the resonant frequency of the second resonance. The first resonance is a differential mode (DM mode), and the second resonance is a common mode (CM mode). The currents on the first stub 210 and the second stub 220 as a whole are in the same direction.

[0109] For example, the matching circuit may include a capacitor structure and / or an inductor structure. The embodiments of this application do not limit the matching circuit, as long as it enables the first antenna 20 to generate a first resonance and a second resonance.

[0110] Referring again to Figure 3, in this embodiment, the first antenna 20 further includes a first tuning component 240 and a second tuning component 250. One end of the first tuning component 240 is coupled to the first stub 210, and the other end is grounded. One end of the second tuning component 250 is coupled to the second stub 220, and the other end is grounded. The first tuning component 240 can adjust the resonant frequency of the first resonance, and the second tuning component 250 can adjust the resonant frequency of the second resonance. It is understood that by adjusting the first tuning component 240 and the second tuning component 250, the resonant frequencies of the first and second resonances can be made to differ significantly (the first resonance is far from the second resonance), such as the difference between the resonant frequencies of the first and second resonances being greater than or equal to 300MHz. This results in a stronger current on the first stub 210 and a weaker current on the second stub 220, thereby making the first resonance an unbalanced DM mode, and the signal corresponding to the first resonance being a partially circularly polarized signal (a weakly circularly polarized signal). Alternatively, the resonant frequencies of the first and second resonances can be made to be relatively close (the first resonance is closer to the second resonance), such as the difference between the resonant frequencies of the first and second resonances being less than or equal to 100MHz, so that the current on the first stub 210 is weaker and the current on the second stub 220 is stronger, thereby making the first resonance an unbalanced DM mode, and the signal corresponding to the first resonance is a partially circularly polarized signal (weakly circularly polarized signal).

[0111] In the above implementation, the first tuning component 240 and the second tuning component 250 may include a capacitor structure and / or an inductor structure, and the embodiments of this application do not limit this.

[0112] Referring again to Figure 3, in this embodiment, the electronic device further includes a second antenna 30, which is disposed on the first frame 110 and / or the second frame 120. The first antenna 20 is used to couple a signal to the second antenna 30, so that the second antenna 30 generates a first parasitic resonance. The signal corresponding to the first parasitic resonance is a circularly polarized signal, and the polarization direction of the first resonance is the same as that of the first parasitic resonance. That is, the circular polarization direction of the signal corresponding to the first resonance is the same as that of the signal corresponding to the first parasitic resonance. For example, both the signal corresponding to the first resonance and the signal corresponding to the first parasitic resonance are either left-hand circularly polarized signals in front of the screen or left-hand circularly polarized signals in back of the screen. It can be understood that left-hand circular polarization in front of the screen is a left-hand circularly polarized signal from the display panel towards the back cover, and left-hand circular polarization in back of the screen is a left-hand circularly polarized signal from the back cover towards the display panel.

[0113] It is understandable that the resonant frequency of the first parasitic resonance is close to the resonant frequency of the first resonance, so that the first parasitic resonance and the first resonance can correspond to the same communication frequency band.

[0114] The electronic device provided in this application embodiment has a first frame 110 and a second frame 120 arranged parallel and spaced apart, and a third frame 130 disposed between the first frame 110 and the second frame 120, with the third frame 130 perpendicular to both the first frame 110 and the second frame 120; the first frame 110, the second frame 120, and the third frame 130 enclose a preset area, and a floor is disposed in the preset area; a first antenna 20 is disposed on the third frame 130, and the first antenna 20 includes: a first stub 210, a second stub 220, a grounding structure 230, and a matching circuit; the grounding structure 230 is disposed between the first stub 210 and the second stub 220, with one end of both the first stub 210 and the second stub 220 coupled to the grounding stub; the grounding structure 230... Coupled with the ground, the first stub 210 is closer to the first frame 110 than the second stub 220; a feed point 260 is provided on the first stub 210, and a matching circuit is coupled to the feed point 260. The matching circuit is used to make the first stub 210 generate a first resonance, and the matching circuit is also used to make the second stub 220 generate a second resonance; the second antenna 30 is provided on the first frame 110 and / or the second frame 120, and the first antenna 20 is used to couple a signal to the second antenna 30 so that the second antenna 30 generates a first parasitic resonance. Both the first parasitic resonance and the first resonance are circularly polarized signals, and the polarization direction of the first parasitic resonance is the same as that of the first resonance, thereby improving the circular polarization signal gain (circular polarization gain) of the first resonance and improving the communication performance of the electronic device.

[0115] For example, when electronic devices communicate with satellites, the communication effect between them can be improved. Accordingly, the satellite communication frequency band can include a portion of the frequency bands in the Tiantong satellite system, including the transmitting frequency band (1980MHz-2010MHz) and the receiving frequency band (2170MHz-2200MHz) of the Tiantong satellite system. In one embodiment, the satellite communication frequency band can include a portion of the frequency bands in the BeiDou satellite system, including the transmitting frequency band (1610MHz-1626.5MHz) and the receiving frequency band (2483.5MHz-2500MHz) of the BeiDou satellite system. In another embodiment, the satellite communication frequency band can include a portion of the frequency bands in a low-Earth orbit satellite system, including the transmitting frequency band (1668MHz-1675MHz) and the receiving frequency band (1518MHz-1525MHz) of a low-Earth orbit satellite system. Alternatively, it can be applied to other satellite communication systems, and this application embodiment does not limit this application.

[0116] In some embodiments, the difference between the resonant frequency of the first resonance and the resonant frequency of the second resonance is greater than or equal to 300MHz. Accordingly, the resonant frequency band of the first resonance and the resonant frequency band of the second resonance can cover different communication frequency bands to increase the bandwidth of the first antenna 20.

[0117] Referring again to Figure 3, in some implementations, the second antenna 30 includes a first sub-antenna 310 disposed on the first frame 110. The third frame 130 includes a first ground frame 131 disposed between the first branch 210 and the first frame 110. The first frame 110 includes a second ground frame 111 disposed between the first sub-antenna 310 and the first ground frame 131. Other antennas can be disposed on the first ground frame 131 and the second ground frame 111 to improve the structural compactness of the electronic device. The first sub-antenna 310 includes a third stub 311 and a first tuning device 313. The third stub 311 has a first gap 312 between it and the second ground frame 111. For example, the end of the third stub 311 facing away from the first gap 312 can be a ground end. The ground current can be adjusted through the third stub 311, thereby making the signal corresponding to the first parasitic resonance a circularly polarized signal. The distance d between the third stub 311 and the first ground frame 131 is less than or equal to 30mm (such as 30mm, 15mm, 10mm, etc.) so that the circular polarization direction of the first parasitic resonance is the same as the circular polarization direction of the first resonance. For example, the circular polarization directions of the first parasitic resonance and the first resonance are both left-hand circular polarization in front of the screen.

[0118] In the above implementation, one end of the first tuning device 313 is coupled to the third branch 311, and the other end of the first tuning device 313 is grounded. The first tuning device 313 can adjust the resonant frequency of the first parasitic resonance, thereby making the resonant frequency of the first parasitic resonance close to the resonant frequency of the first resonance (for example, the difference between the resonant frequency of the first parasitic resonance and the resonant frequency of the first resonance is within 50MHz), so that the first parasitic resonance and the first resonance cover the same communication frequency band, ensuring that the communication signal in this communication frequency band has a high circular polarization gain. For example, the first tuning device 313 may include a capacitor structure and / or an inductor structure; this embodiment of the application does not limit this.

[0119] In some examples, the distance d between the third stub 311 and the first grounding frame 131 is 30mm-20mm, and the circular polarization gain gradually decreases as the distance increases. In other examples, the distance between the third stub 311 and the first grounding frame 131 is 15mm-0mm, and the circular polarization gain gradually increases as the distance increases. Finally, a distance of 15mm ± 5mm (e.g., 10mm, 15mm, 20mm, etc.) between the third stub 311 and the first grounding frame 131 results in a higher circular polarization gain, further improving the gain of the circular polarization signal and enhancing communication performance.

[0120] The first sub-antenna 310 is disposed on the first frame 110. It can be understood that the third branch 311 and the first frame 110 can be an integral structure, that is, part of the first frame 110 serves as the third branch 311; or the third branch 311 is connected to the first frame 110 by bolts or glue, etc. The embodiments of this application do not limit this.

[0121] It is understood that the distance between the third branch 311 and the first grounding frame 131 is less than or equal to half the wavelength corresponding to the first resonant frequency, so that the circular polarization direction of the first parasitic resonance is the same as the circular polarization direction of the first resonance.

[0122] In the above implementation, by adjusting the second tuning component 250, the resonant frequency of the second resonance can be adjusted, and the direction of the circularly polarized beam can be adjusted so that the angle between the radiation direction of the beam and the horizontal plane is about 30°-60° (such as 30°, 45°, 60°, etc.). This ensures a large circular polarization gain while facilitating communication with satellites (such as facilitating satellite tracking).

[0123] Referring to Figure 4, in some embodiments, the second antenna 30 includes a second sub-antenna 320 disposed on the second frame 120, the third frame 130 includes a third grounding frame 132 disposed between the second branch 220 and the second frame 120, the second frame 120 includes a fourth grounding frame 121 disposed between the second sub-antenna 320 and the third grounding frame 132, and a fifth grounding frame 222 disposed on the side of the second sub-antenna 320 facing away from the fourth grounding frame 121; the second sub-antenna 320 includes a fourth branch 321 and a second tuning device 323, the fourth branch 321... There is a second gap 322 between the fourth branch 321 and the fifth grounding frame 222. The end of the fourth branch 321 facing away from the second gap 322 can be a grounding end. The ground current can be adjusted through the fourth branch 321, so that the signal corresponding to the first parasitic resonance is a circularly polarized signal. The distance d between the fourth branch 321 and the third grounding frame 132 is less than or equal to 30mm (such as 10mm, 15mm, 20mm, etc.) so that the circular polarization direction of the first parasitic resonance is the same as the circular polarization direction of the first resonance. For example, the circular polarization direction of the first parasitic resonance and the first resonance is both left-hand circular polarization in front of the screen.

[0124] In the above implementation, one end of the second tuning device 323 is coupled to the fourth branch 321, and the other end of the second tuning device 323 is grounded. The second tuning device 323 can adjust the resonant frequency of the first parasitic resonance, thereby making the resonant frequency of the first parasitic resonance close to the resonant frequency of the first resonance, so that the first parasitic resonance and the first resonance cover the same communication frequency band, ensuring that the communication signal in this communication frequency band has a high circular polarization gain. For example, the second tuning device 323 may include a capacitor structure and / or an inductor structure; this application embodiment does not limit this.

[0125] The second sub-antenna 320 is disposed on the second frame 120. It can be understood that the fourth branch 321 and the second frame 120 can be an integral structure, that is, part of the second frame 120 serves as the fourth branch 321; or the fourth branch 321 is connected to the second frame 120 by bolts or glue, etc. The embodiments of this application do not limit this.

[0126] The distance d between the fourth branch 321 and the third grounding frame 132 is less than or equal to half the wavelength corresponding to the first resonant frequency, so that the circular polarization direction of the first parasitic resonance is the same as the circular polarization direction of the first resonance.

[0127] Referring to Figure 5, in some embodiments, the second antenna 30 includes a third sub-antenna 330 disposed on the second frame 120, the third frame 130 includes a third ground frame 132 disposed between the second stub 220 and the second frame 120, and the second frame 120 includes a fourth ground frame 121 disposed between the third sub-antenna 330 and the third ground frame 132; the third sub-antenna 330 includes a fifth stub 331 and a third tuning device 333, a third gap 332 between the fifth stub 331 and the fourth ground frame 121, and the end of the fifth stub 331 facing away from the third gap 332 can be a ground end, and the ground current can be adjusted through the fifth stub 331, thereby making the signal corresponding to the first parasitic resonance a circularly polarized signal; the distance d between the fifth stub 331 and the third ground frame 132 is greater than or equal to 30mm, so that the circular polarization direction of the first parasitic resonance is the same as the circular polarization direction of the first resonance, for example, the circular polarization direction of the first parasitic resonance and the first resonance are both left-hand circular polarization in front of the screen.

[0128] In the above implementation, the distance d between the fifth branch 331 and the third grounding frame 132 is greater than or equal to half the wavelength corresponding to the first resonant frequency, so that the circular polarization direction of the first parasitic resonance is the same as the circular polarization direction of the first resonance.

[0129] In the above implementation, one end of the third tuning device 333 is coupled to the fifth branch 331, and the other end of the third tuning device 333 is grounded. The third tuning device 333 can adjust the resonant frequency of the first parasitic resonance, thereby making the resonant frequency of the first parasitic resonance close to the resonant frequency of the first resonance, so that the first parasitic resonance and the first resonance cover the same communication frequency band, ensuring that the communication signal in this communication frequency band has a high circular polarization gain. For example, the third tuning device 333 may include a capacitor structure and / or an inductor structure; this application embodiment does not limit this.

[0130] Referring to Figures 6 and 7, in some embodiments, the second antenna 30 may include at least two of the first sub-antenna 310, the second sub-antenna 320, and the third sub-antenna 330 to further improve the gain of the circularly polarized signal and enhance communication performance. For example, the second antenna 30 may include the first sub-antenna 310 and the second sub-antenna 320, or the second antenna 30 may include the first sub-antenna 310, the second sub-antenna 320, and the third sub-antenna 330; this embodiment does not impose limitations on this. Accordingly, each tuning device can be grounded through a switching device or coupled to a corresponding stub through a switching device. The switching device can control the operation of the corresponding sub-antenna to adjust the circular polarization gain.

[0131] In some embodiments, the difference between the resonant frequency of the first resonance and the resonant frequency of the second resonance can be less than or equal to 100MHz, so that the resonant frequency band of the first resonance and the resonant frequency band of the second resonance can cover the same communication frequency band, thereby increasing the bandwidth of the communication frequency band and improving the antenna performance of the second antenna 30.

[0132] Referring to Figure 8, in some implementations, the second antenna 30 includes a fourth sub-antenna 340, which is disposed on the first frame 110; the third frame 130 includes a first ground frame 131 disposed between the first stub 210 and the first frame 110; the first frame 110 includes a second ground frame 111 disposed between the fourth sub-antenna 340 and the first ground frame 131, and a sixth ground frame 112 located on the side of the fourth sub-antenna 340 facing away from the second ground frame 111; the fourth sub-antenna 340 includes a seventh stub 341 and a fourth tuning... Device 343 has a fourth gap 342 between the seventh branch 341 and the sixth ground frame 112. The end of the seventh branch 341 facing away from the fourth gap 342 can be a ground terminal. The ground current can be adjusted through the seventh branch 341, thereby making the signal corresponding to the first parasitic resonance a circularly polarized signal. The distance d between the seventh branch 341 and the first ground frame 131 is less than or equal to 30mm, so that the circular polarization direction of the first parasitic resonance is the same as the circular polarization direction of the first resonance. For example, the circular polarization directions of the first parasitic resonance and the first resonance are both left-hand circular polarization behind the screen.

[0133] In the above implementation, one end of the fourth tuning device 343 is coupled to the seventh branch 341, and the other end of the fourth tuning device 343 is grounded. The fourth tuning device 343 can adjust the resonant frequency of the first parasitic resonance, thereby making the resonant frequency of the first parasitic resonance close to the resonant frequency of the first resonance, so that the first parasitic resonance and the first resonance cover the same communication frequency band, ensuring that the communication signal in this communication frequency band has a high circular polarization gain. For example, the fourth tuning device 343 may include a capacitor structure and / or an inductor structure; this application embodiment does not limit this.

[0134] In the above implementation, the distance d between the seventh branch 341 and the first grounding frame 131 is less than or equal to half the wavelength corresponding to the first resonant frequency, so that the circular polarization direction of the first parasitic resonance is the same as the circular polarization direction of the first resonance.

[0135] Referring to Figure 9, in some embodiments, the second antenna 30 includes a fifth sub-antenna 350, which is disposed on the first frame 110; the third frame 130 includes a first ground frame 131 disposed between the first stub 210 and the first frame 110, and the first frame 110 includes a second ground frame 111 disposed between the fifth sub-antenna 350 and the first ground frame 131; the fifth sub-antenna 350 includes an eighth stub 351 and a fifth tuning device 353, and a fifth slot is formed between the eighth stub 351 and the second ground frame 111. The end of the eighth spur 351 away from the fifth spur 352 can be a grounding terminal. The ground current can be adjusted through the eighth spur 351, thereby making the signal corresponding to the first parasitic resonance a circularly polarized signal. The distance d between the eighth spur 351 and the first grounding frame 131 is greater than or equal to 30mm (such as 60mm, 50mm, 35mm, 30mm, etc.) so that the circular polarization direction of the first parasitic resonance is the same as the circular polarization direction of the first resonance. For example, the circular polarization directions of the first parasitic resonance and the first resonance are both left-hand circular polarization behind the screen.

[0136] In the above implementation, one end of the fifth tuning device 353 is coupled to the eighth stub 351, and the other end of the fifth tuning device 353 is grounded. The fifth tuning device 353 can adjust the resonant frequency of the first parasitic resonance, thereby making the resonant frequency of the first parasitic resonance close to the resonant frequency of the first resonance, so that the first parasitic resonance and the first resonance cover the same communication frequency band, ensuring that the communication signal in this communication frequency band has a high circular polarization gain. For example, the fifth tuning device 353 may include a capacitor structure and / or an inductor structure; this application embodiment does not limit this.

[0137] In the above implementation, the distance d between the eighth branch 351 and the first ground frame 131 is greater than or equal to half the wavelength corresponding to the first resonant frequency, so that the circular polarization direction of the first parasitic resonance is the same as the circular polarization direction of the first resonance.

[0138] For example, the distance between the eighth branch 351 and the first grounding frame 131 is greater than or equal to 45 mm and less than or equal to 60 mm, in order to further improve the circular polarization gain and improve communication performance.

[0139] In some examples, when the distance between the eighth branch 351 and the first ground frame 131 is 60mm-50mm, the circular polarization gain is greater than 2dBic. When the distance between the eighth branch 351 and the first ground frame 131 is 50mm-35mm, the circular polarization gain gradually increases with the increase of distance.

[0140] Referring to Figure 10, in some embodiments, the second antenna 30 includes a sixth sub-antenna 360 disposed on the second frame 120, and the third frame 130 includes a third ground frame 132 disposed between the second stub 220 and the second frame 120. The second frame 120 includes a fourth ground frame 121 disposed between the sixth sub-antenna 360 and the third ground frame 132. The sixth sub-antenna 360 includes a ninth stub 361 and a sixth tuning device 363. A sixth gap 362 is provided between the ninth stub 361 and the fourth ground frame 121. The end of the ninth stub 361 facing away from the sixth gap 362 can be a ground end. The ground current can be adjusted through the ninth stub 361, thereby making the signal corresponding to the first parasitic resonance a circularly polarized signal. The distance d between the ninth stub 361 and the third ground frame 132 is less than or equal to 30 mm, so that the circular polarization direction of the first parasitic resonance is the same as the circular polarization direction of the first resonance. For example, the circular polarization directions of the first parasitic resonance and the first resonance are both rear-screen left-hand circular polarization.

[0141] In the above implementation, the distance d between the ninth branch 361 and the third grounding frame 132 is less than or equal to half the wavelength corresponding to the first resonant frequency, so that the circular polarization direction of the first parasitic resonance is the same as the circular polarization direction of the first resonance.

[0142] In the above implementation, one end of the sixth tuning device 363 is coupled to the ninth stub 361, and the other end of the sixth tuning device 363 is grounded. The sixth tuning device 363 can adjust the resonant frequency of the first parasitic resonance, thereby making the resonant frequency of the first parasitic resonance close to the resonant frequency of the first resonance, so that the first parasitic resonance and the first resonance cover the same communication frequency band, ensuring that the communication signal in this communication frequency band has a high circular polarization gain. For example, the sixth tuning device 363 may include a capacitor structure and / or an inductor structure; this application embodiment does not limit this.

[0143] Referring to Figure 11, in some embodiments, the second antenna 30 may include at least two of the fourth sub-antenna 340, the fifth sub-antenna 350, and the sixth sub-antenna 360 to further improve the gain of the circularly polarized signal and enhance communication performance. For example, the second antenna 30 may include the fourth sub-antenna 340 and the fifth sub-antenna 350, or the second antenna 30 may include the fourth sub-antenna 340, the fifth sub-antenna 350, and the sixth sub-antenna 360; this embodiment does not impose limitations on this. Accordingly, each tuning device can be grounded through a switching device or coupled to a corresponding stub through a switching device. The switching device can control the operation of the corresponding sub-antenna to adjust the circular polarization gain.

[0144] Referring to Figures 6 and 11, in some embodiments, the second antenna 30 may include at least one of a first sub-antenna 310, a second sub-antenna 320, and a third sub-antenna 330, and at least one of a fourth sub-antenna 340, a fifth sub-antenna 350, and a sixth sub-antenna 360. Accordingly, each tuning device is grounded via a switching device or coupled to a corresponding stub via a switching device. During operation, the first and second resonances are adjusted by the first tuning component 240 and the second tuning component 250 so that the signal corresponding to the first resonance is a circularly polarized signal. For example, when the difference between the resonant frequency of the first resonance and the resonant frequency of the second resonance is greater than or equal to 300MHz, the switching devices corresponding to the fourth sub-antenna 340, the fifth sub-antenna 350, and the sixth sub-antenna 360 are open, and at least one switching device corresponding to the first sub-antenna 310, the second sub-antenna 320, and the third sub-antenna 330 is closed, i.e., the first sub-antenna 310, the second sub-antenna 340, the second sub-antenna 350, and the sixth sub-antenna 360 are closed. At least one of the first sub-antenna 310 and the third sub-antenna 330 operates to improve the circular polarization gain. When the difference between the resonant frequency of the first resonance and the resonant frequency of the second resonance is less than or equal to 100MHz, the switching devices corresponding to the first sub-antenna 310, the second sub-antenna 320, and the third sub-antenna 330 are open, and at least one of the switching devices corresponding to the fourth sub-antenna 340, the fifth sub-antenna 350, and the sixth sub-antenna 360 is closed, that is, at least one of the fourth sub-antenna 340, the fifth sub-antenna 350, and the sixth sub-antenna 360 operates to improve the circular polarization gain. In this way, the electronic device can switch between different communication frequency bands.

[0145] Referring to Figure 12, for example, the second antenna 30 may include a second sub-antenna 320 and a fourth sub-antenna 340. When the difference between the resonant frequency of the first resonance and the resonant frequency of the second resonance is greater than or equal to 300MHz, the switching device corresponding to the second sub-antenna 320 is closed, and the switching device corresponding to the fourth sub-antenna 340 is open, thus the second sub-antenna 320 is operational. When the difference between the resonant frequency of the first resonance and the resonant frequency of the second resonance is less than or equal to 100MHz, the switching device corresponding to the fourth sub-antenna 340 is closed, and the switching device corresponding to the second sub-antenna 320 is open, thus the fourth sub-antenna 340 is operational.

[0146] For example, in an implementation where the second tuning component 250, the second tuning device 323, and the fourth tuning device 343 all include capacitor structures, when the difference between the resonant frequency of the first resonance and the resonant frequency of the second resonance is greater than or equal to 300MHz, the capacitance value of the second tuning component 250 can be about 0.5pF, and the capacitance value of the second tuning device 323 can be about 0.3pF. In this case, the beam is mainly concentrated in front of the screen and radiates roughly from the back cover 102 towards the display panel 101. When the difference between the resonant frequency of the first resonance and the resonant frequency of the second resonance is less than or equal to 100MHz, the capacitance value of the second tuning component 250 can be about 0.3pF, and the capacitance value of the fourth tuning device 343 can be about 0.3pF. In this case, the beam is mainly concentrated behind the screen and radiates roughly from the display panel 101 towards the back cover 102. The beam direction is complementary when the difference between the resonant frequencies of the first and second resonances is greater than or equal to 300MHz, and when the difference is less than or equal to 100MHz, thus increasing the coverage area. Therefore, the beam direction can be adjusted by the second tuning component 250, the second tuning device 323, and the fourth tuning device 343, thereby improving the communication performance of the electronic equipment.

[0147] It should be understood that the "common mode" or "CM mode" in the embodiments of this application includes line common mode and slot common mode, while the "differential mode" or "DM mode" in the embodiments of this application includes line differential mode and slot differential mode, which can be determined according to the structure of the antenna.

[0148] 1. Wire common mode (CM) mode

[0149] Figure 13 shows an antenna radiator 40 with open ends and a feed circuit (not shown) connected at the middle position 41. In one embodiment, the radiator 40 is fed in a symmetrical feed configuration. The feed circuit can be connected to the middle position 41 of the radiator 40 via a feed wire 42. It should be understood that a symmetrical feed can be understood as one end of the feed circuit being connected to the radiator, and the other end being coupled to the ground plane. The connection point between the feed circuit and the radiator 40 (the feed point) is located at the center of the radiator, which can be, for example, the midpoint of the geometry, or the midpoint of the electrical length (or a certain area within a certain range near the aforementioned midpoint).

[0150] The intermediate position 41 of the radiator 40 may be, for example, the geometric center of the radiator, or the midpoint of the electrical length of the radiator. In one embodiment, the feed line 42 is connected to the radiator 40 via a connector such as a spring clip, and the connection between the connector and the radiator 40 covers the intermediate position 41.

[0151] Figure 14 shows the current and electric field distribution of antenna 40. As shown in Figure 14, the current exhibits an opposite distribution, for example, a symmetrical distribution, on both sides of the central position 41; the electric field exhibits a unidirectional distribution on both sides of the central position 41. As shown in Figure 14, the current at the feed line 42 exhibits a unidirectional distribution. Based on the unidirectional current distribution at the feed line 42, the feeding method shown in Figures 13 and 14 can be called a line CM feed. Based on the opposite current distribution on both sides of the radiator, the antenna mode shown in Figure 14 can be called a line CM mode (or simply CM mode; for example, for a line antenna, CM mode refers to the line CM mode). The current and electric field shown in Figure 14 can be referred to as the current and electric field of the line CM mode, respectively.

[0152] 2. Differential mode (DM)

[0153] Figure 15 shows that the left and right ends of the radiator 50 are open, and a feed circuit is connected at the middle position 51. In one embodiment, the radiator 50 is fed using an anti-symmetrical feed. One end of the feed circuit is connected to a portion of the radiator 50 via a feed wire 52, and the other end of the feed circuit is connected to another portion of the radiator 50 via a feed wire 52. The middle position 51 may include the geometric center of the radiator 50.

[0154] It should be understood that the "center-antisymmetric feeding" mentioned in the embodiments of this application can be understood as the positive and negative poles of the feeding unit being connected to two connection points near the midpoint of the radiator. In one embodiment, the signal amplitudes output by the positive and negative poles of the feeding unit are the same, but the phases are opposite, for example, the phase difference is 180°±10°.

[0155] Figure 16 shows the current and electric field distribution of the radiator 50. As shown in Figure 16, the current is distributed in the same direction on both sides of the middle position 51 of the radiator 50, for example, an antisymmetric distribution; the electric field is distributed in opposite directions on both sides of the middle position 51. As shown in Figure 16, the current at the feed line 52 is distributed in opposite directions. Based on the opposite current distribution at the feed line 52, the feeding method shown in Figure 15 can be called a line DM feed. Based on the current being distributed in the same direction on both sides of the radiator, the antenna mode shown in Figure 16 can be called a line DM mode (or simply DM mode; for example, for a line antenna, DM mode refers to the line DM mode). The current and electric field shown in Figure 16 can be referred to as the current and electric field of the line DM mode, respectively.

[0156] 3. Slot CM mode

[0157] Figure 17 shows an antenna radiator with a hollowed-out slot or gap 61, or it can be viewed as the radiator 60 of the antenna and the ground plane (e.g., the ground plane of a PCB) enclosing the slot or gap 61. In one embodiment, the slot 61 can be formed by slotting in the ground plane. In another embodiment, the slot 61 can be enclosed by coupling the two ends of the radiator 60 to the ground plane. An opening 62 is provided on one side of the slot 61, and the opening 62 can be specifically located at the middle position of that side. The middle position of this side of the slot 61 can be, for example, the geometric midpoint of the radiator 60, or the midpoint of the electrical length of the radiator, for example, the area where the opening 62 is located on the radiator covers the middle position of this side. A feed circuit can be connected to the opening 62, and an antisymmetric feed is used. It should be understood that antisymmetric feed can be understood as the positive and negative poles of the feed circuit being connected to the two ends of the radiator, respectively. The signal amplitudes output by the positive and negative poles of the feed circuit are the same, but the phases are opposite, for example, a phase difference of 180° ± 10°.

[0158] Figure 18 illustrates the current, electric field, and magnetic current distribution on the radiator 60 (which may also include a floor). As shown in Figure 18, the current is unidirectionally distributed around slot 61 on the conductors surrounding slot 61 (such as the floor and / or radiator 60), the electric field is anti-directionally distributed on both sides of the opening 62 of slot 61, and the magnetic current is anti-directionally distributed on both sides of the middle position of slot 61. As shown in Figure 18, the electric field and magnetic current at the opening 62 (e.g., the feed point) are unidirectional. Based on the unidirectional magnetic current at the opening 62 (feed point), this type of feed shown in Figure 18 can be called slot CM feed. Based on the unidirectional distribution of current on the radiators on both sides of opening 62 (e.g., antisymmetric distribution), or based on the unidirectional distribution of current around slot 61 on the conductors surrounding slot 61, this antenna mode shown in Figure 18 can be called slot CM mode (or simply CM mode; for example, for a slot antenna, CM mode refers to slot CM mode). The electric field, current, and magnetic current distribution shown in Figure 18 can be referred to as the electric field, current, and magnetic current of the slot CM mode.

[0159] 4. Slot DM mode

[0160] As shown in Figure 19, the radiator of the antenna has a hollowed-out slot or gap 72, or it can be viewed that the radiator 70 of the antenna and the ground plane (e.g., the ground plane of a PCB) enclose the slot or gap 72. In one embodiment, the slot 72 can be formed by slotting in the ground plane. In another embodiment, the slot 72 can be formed by coupling the two ends of the radiator 70 to the ground plane. A feed circuit is connected at the middle position 71 of the slot 72, and symmetrical feeding is used. It should be understood that symmetrical feeding can be understood as one end of the feed circuit being connected to the radiator, and the other end being coupled to the ground plane to achieve grounding, wherein the connection point between the feed circuit and the radiator (feed point) is located at the center of the radiator, which can be, for example, the midpoint of the geometric structure, or the midpoint of the electrical length (or a certain range near the aforementioned midpoint). The middle position of one side of the slot 72 is connected to the positive terminal of the feed circuit, and the middle position of the other side of the slot 72 is connected to the negative terminal of the feed circuit. The middle position of the side of the slot 72 may be, for example, the middle position of the radiator 70, and / or the middle position of the floor, such as the geometric midpoint of the radiator 70, or the midpoint of the electrical length of the radiator, such as the connection between the power supply circuit and the radiator covering the middle position 71 of that side.

[0161] Figure 20 illustrates the current, electric field, and magnetic current distribution on the radiator 70 (which may also include a floor). As shown in Figure 20, on the conductors (such as the floor and / or the radiator 70) surrounding the slot 72, the current is distributed around the slot 72, and the current is distributed in opposite directions on both sides of the middle position 71 of the slot 72. The electric field is distributed in the same direction on both sides of the middle position 71, and the magnetic current is distributed in the same direction on both sides of the middle position 71. The magnetic current at the feed circuit is distributed in opposite directions (not shown). Based on the opposite magnetic current distribution at the feed circuit, the feed shown in Figure 19 can be called a slot DM feed. Based on the opposite current distribution (e.g., symmetrical distribution) on both sides of the radiator 70, or based on the opposite current distribution (e.g., symmetrical distribution) around the slot 71, the antenna mode shown in Figure 20 can be called a slot DM mode (or simply DM mode; for example, for a slot antenna, DM mode refers to the slot DM mode). The electric field, current, and magnetic current distribution shown in Figure 20 can be referred to as the electric field, current, and magnetic current of the slot DM mode.

[0162] The above description is merely a specific implementation of the embodiments of this application, but the protection scope of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the protection scope of this application. Therefore, the protection scope of this application should be determined by the protection scope of the claims.

Claims

1. An electronic device, characterized in that, include: The middle frame includes a first border, a second border, and a third border. The first border and the second border are parallel and spaced apart. The third border is disposed between the first border and the second border and is perpendicular to both the first border and the second border. A floor, with the first border, the second border, and the third border forming a preset area, and the floor disposed in the preset area; A first antenna is disposed on the third frame and includes a first stub, a second stub, a grounding structure, and a matching circuit. The grounding structure is disposed between the first stub and the second stub, and one end of both the first stub and the second stub is coupled to the grounding stub. The grounding structure is coupled to the grounding ground. The first stub is closer to the first frame than the second stub. A feed point is disposed on the first stub, and the matching circuit is coupled to the feed point. The matching circuit is used to generate a first resonance in the first stub and to generate a second resonance in the second stub. The second antenna is disposed on the first frame and / or the second frame. The first antenna is used to couple a signal to the second antenna so that the second antenna generates a first parasitic resonance. Both the first parasitic resonance and the first resonance are circularly polarized signals, and the polarization direction of the first parasitic resonance is the same as that of the first resonance.

2. The electronic device according to claim 1, characterized in that, The difference between the resonant frequency of the first resonance and the resonant frequency of the second resonance is greater than or equal to 300MHz.

3. The electronic device according to claim 2, characterized in that, The second antenna includes a first sub-antenna disposed on a first frame; the third frame includes a first ground frame disposed between the first stub and the first frame, and the first frame includes a second ground frame disposed between the first sub-antenna and the first ground frame; the first sub-antenna includes a third stub and a first tuning device, the third stub and the second ground frame have a first gap, and the distance between the third stub and the first ground frame is less than or equal to 30 mm; One end of the first tuning device is coupled to the third branch, and the other end of the first tuning device is grounded.

4. The electronic device according to claim 3, characterized in that, The distance between the third branch and the first grounding frame is 15mm ± 5mm.

5. The electronic device according to any one of claims 2-4, characterized in that, The second antenna includes a second sub-antenna, and the third frame includes a third ground frame disposed between the second stub and the second frame. The second frame includes a fourth ground frame disposed between the second sub-antenna and the third ground frame, and a fifth ground frame disposed on the side of the second sub-antenna facing away from the fourth ground frame. The second sub-antenna includes a fourth stub and a second tuning device. There is a second gap between the fourth stub and the fifth ground frame, and the distance between the fourth stub and the third ground frame is less than or equal to 30 mm. One end of the second tuning device is coupled to the fourth branch, and the other end of the second tuning device is grounded.

6. The electronic device according to any one of claims 3-5, characterized in that, The second antenna includes a third sub-antenna, the third frame includes a third ground frame disposed between the second stub and the second frame, the second frame includes a fourth ground frame disposed between the third sub-antenna and the third ground frame; the third sub-antenna includes a fifth stub and a third tuning device, the fifth stub and the fourth ground frame have a third gap, and the distance between the fifth stub and the third ground frame is greater than or equal to 30mm; One end of the third tuning device is coupled to the fifth branch, and the other end of the third tuning device is grounded.

7. The electronic device according to claim 1, characterized in that, The difference between the resonant frequency of the first resonance and the resonant frequency of the second resonance is less than or equal to 100MHz.

8. The electronic device according to claim 7, characterized in that, The second antenna includes a fourth sub-antenna disposed on the first frame; the third frame includes a first ground frame disposed between the first stub and the first frame, the first frame including a second ground frame disposed between the fourth sub-antenna and the first ground frame, and a sixth ground frame located on the side of the fourth sub-antenna facing away from the second ground frame; the fourth sub-antenna includes a seventh stub and a fourth tuning device, the seventh stub having a fourth gap with the sixth ground frame, and the distance between the seventh stub and the first ground frame being less than or equal to 30 mm; One end of the fourth tuning device is coupled to the seventh branch, and the other end of the fourth tuning device is grounded.

9. The electronic device according to claim 7 or 8, characterized in that, The second antenna includes a fifth sub-antenna disposed on the first frame; the third frame includes a first ground frame disposed between the first stub and the first frame, and the first frame includes a second ground frame disposed between the fifth sub-antenna and the first ground frame; the fifth sub-antenna includes an eighth stub and a fifth tuning device, the eighth stub having a fifth gap with the second ground frame, and the distance between the eighth stub and the first ground frame being greater than or equal to 30 mm; one end of the fifth tuning device is coupled to the eighth stub, and the other end of the fifth tuning device is grounded.

10. The electronic device according to claim 9, characterized in that, The distance between the eighth branch and the first grounding frame is greater than or equal to 45mm and less than or equal to 60mm.

11. The electronic device according to any one of claims 7-10, characterized in that, The second antenna includes a sixth sub-antenna, and the third frame includes a third ground frame disposed between the second stub and the second frame. The second frame includes a fourth ground frame disposed between the sixth sub-antenna and the third ground frame. The sixth sub-antenna includes a ninth stub and a sixth tuning device. The ninth stub and the fourth ground frame have a sixth gap. The distance between the ninth stub and the third ground frame is less than or equal to 30 mm. One end of the sixth tuning device is coupled to the ninth branch, and the other end of the sixth tuning device is grounded.

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