Antenna system and terminal device

Abstract

The embodiment of the present application provides an antenna system and a terminal device, wherein the antenna system is used for the terminal device, the antenna system comprises a first radiator, a second radiator, a first feeding part, a second feeding part, a first matching circuit and a second matching circuit, the first matching circuit is used for grounding the feeding received by the second feeding part, the second matching circuit is used for grounding the feeding received by the first feeding part, and the first feeding part is used for receiving the feeding and exciting the first radiator and the second radiator to jointly generate circular polarization resonance propagating along the direction perpendicular to the plane formed by the first radiator and the second radiator. The present application sets the antenna system in the terminal device, so that the circular polarization radiation on the side of the screen can be realized by using the side frame of the terminal device, without occupying the front substrate of the terminal device, thereby realizing high-quality signal transmission of the terminal device and guaranteeing the good appearance of the terminal device.

Description

Technical Field

[0001] This application relates to the field of mobile communication technology, and in particular to an antenna system and terminal device. Background Technology

[0002] Currently, circularly polarized antennas in terminal devices can reduce polarization mismatch losses compared to linearly polarized antennas, leading to their widespread adoption in many applications. However, existing terminal devices typically focus only on scenarios where the screen is perpendicular to the ground plane when held by the user, and antenna performance is limited to the radiation pattern and gain in this context. This neglects the fact that users usually hold the device with the screen parallel to the ground plane, where polarization radiation efficiency perpendicular to the screen is crucial. Therefore, effectively achieving circularly polarized radiation perpendicular to the screen is a pressing issue. Furthermore, current technologies often require adding an extra metal stub, either through the frame or the battery back cover, to achieve circular polarization, severely limiting the space available for other antennas. Given the numerous frequency bands that modern mobile phones need to support, coupled with limited antenna space and quantity, achieving support for multiple frequency bands and ensuring good performance and isolation for each antenna within a limited antenna size and number remains a significant challenge for the industry. Utility Model Content

[0003] This application provides an antenna system and terminal device that achieves circularly polarized radiation without introducing additional metal stubs into the antenna system, thereby freeing up space for other antennas and avoiding signal crosstalk between different antennas. This enables high-quality multi-band signal transmission within a limited space. By incorporating the antenna system within the terminal device, circularly polarized radiation on the screen side can be achieved using the side bezel of the terminal device, without occupying the front substrate. This ensures both high-quality signal transmission and a pleasing appearance for the terminal device.

[0004] In a first aspect, this application provides an antenna system including a first radiator, a second radiator, a first feed section, a second feed section, a first matching circuit, and a second matching circuit. The second radiator includes a first radiator and a second radiator electrically connected, with the extension direction of the first radiator perpendicular to the extension direction of the second radiator. The first feed section is electrically connected to the first radiator and is used to receive feed. The second feed section is electrically connected to the first radiator and is used to receive feed. The first matching circuit is electrically connected between the first feed section and the first radiator. The second matching circuit is electrically connected between the second feed section and the first radiator. The first matching circuit is used to ground the feed received by the second feed section, and the second matching circuit is used to ground the feed received by the first feed section. The first feed section is used to receive feed and excite the first radiator and the second radiator to jointly generate a circularly polarized resonance propagating in a direction perpendicular to the plane formed by the first radiator and the second radiator. The first feed section is also used to receive feed and excite the first radiator to generate a first resonance, and the second feed section is used to receive feed and excite the first radiator to generate a second resonance.

[0005] This application provides an antenna system comprising a first radiator, a second radiator, a first feed section, a second feed section, a first matching circuit, and a second matching circuit. The second radiator includes an electrically connected first radiator and a second radiator. When the first feed section receives power and generates an excitation current directly on the first radiator, the second matching circuit can guide the excitation current to ground to prevent the excitation current from continuously acting on the first radiator, thereby preventing the first radiator from emitting crosstalk signals. At the same time, the second radiator, which is perpendicular to the first radiator, can generate a coupling current under the action of capacitive coupling. The excitation current and the coupling current are orthogonal to each other, have similar strengths, and have a 90-degree phase difference, thereby generating a circularly polarized resonance propagating in a direction perpendicular to the plane formed by the first and second radiators. Furthermore, when the first feed section receives additional feed and excites the first radiator to generate a first resonance, the second matching circuit can also ground the feed to prevent the feed from continuously acting on the first radiator, thereby preventing the first radiator from emitting crosstalk signals. When the second feed section receives feed and excites the first radiator to generate a second resonance, the first matching circuit can ground the feed to prevent the feed from continuously acting on the first radiator, thereby preventing the first radiator from emitting crosstalk signals. Ultimately, the antenna system achieves high-quality signal transmission across multiple frequency bands for circular polarization resonance, the first resonance, and the second resonance. In a second aspect, this application provides a terminal device, including a frame, a substrate, and the antenna system described in the first aspect. The frame surrounds the edge of the substrate and includes a first side and a second side that are perpendicular to each other. A first radiator and a first radiating part are formed on the first side, and a second radiating part is formed on the second side. The first feed section is used to receive feed and excite the first radiator and the second radiating part to jointly generate a circular polarization resonance propagating in a direction perpendicular to the substrate.

[0006] In a second aspect, this application provides a terminal device, including a frame, a substrate, and the antenna system described in the first aspect. The frame is disposed around the edge of the substrate. The frame includes a first side and a second side that are perpendicular to each other. A first radiator and a first radiating portion are formed on the first side, and a second radiating portion is formed on the second side. A first feeding portion is used to receive feeding and excite the first radiator and the second radiating portion to jointly generate a circularly polarized resonance that propagates in a direction perpendicular to the substrate.

[0007] This embodiment of the application arranges a first radiator and a second radiator on the side frame of the terminal device, thereby generating circularly polarized radiation perpendicular to the main plane of the terminal device under the feed excitation received by the first feed section, without occupying the front substrate of the terminal device, such as the front screen. This achieves high-quality signal transmission of the terminal device while ensuring a good appearance. Furthermore, it enables high-quality multi-band signal transmission within the limited antenna space of the terminal device. Attached Figure Description

[0008] Figure 1 This is a schematic diagram of a terminal device provided in one embodiment of this application;

[0009] Figure 2 This is a schematic diagram of the antenna system of a terminal device provided in one embodiment of this application;

[0010] Figure 3 This is a schematic diagram of the antenna system of a terminal device provided in another embodiment of this application;

[0011] Figure 4 This is a schematic diagram of the antenna system of a terminal device provided in another embodiment of this application;

[0012] Figure 5 This is a schematic diagram of the antenna system of a terminal device provided in another embodiment of this application;

[0013] Figure 6 This is a schematic diagram of the cooperative structure of the second power supply section and the second matching circuit provided in one embodiment of this application;

[0014] Figure 7 This is a schematic diagram of the cooperative structure of the first power supply unit and the first matching circuit provided in one embodiment of this application;

[0015] Figure 8 This is a schematic diagram of the cooperative structure of the first power supply unit and the first matching circuit provided in another embodiment of this application;

[0016] Figure 9 This is a schematic diagram of the antenna system of a terminal device provided in another embodiment of this application;

[0017] Figure 10This is a schematic diagram of the cooperative structure of the third power supply unit and the third matching circuit provided in one embodiment of this application;

[0018] Figure 11 This is a schematic diagram of the cooperative structure of the third power supply unit and the third matching circuit provided in another embodiment of this application;

[0019] Figure 12 This is a schematic diagram of the cooperative structure of the third power supply unit and the third matching circuit provided in another embodiment of this application;

[0020] Figure 13 This is a schematic diagram of the antenna system of a terminal device provided in another embodiment of this application;

[0021] Figure 14 This is a schematic diagram of the cooperative structure of the second power supply section and the second matching circuit provided in another embodiment of this application;

[0022] Figure 15 This is a schematic diagram of the cooperative structure of the second power supply section and the second matching circuit provided in another embodiment of this application;

[0023] Figure 16 This is a schematic diagram of the antenna system of a terminal device provided in another embodiment of this application;

[0024] Figure 17 yes Figure 3 The three-dimensional axial ratio radiation pattern of the antenna system shown is illustrated under certain conditions.

[0025] Figure 18 yes Figure 3 The antenna system shown is a two-dimensional axial ratio radiation pattern under certain conditions;

[0026] Figure 19 yes Figure 3 Another two-dimensional axial ratio radiation pattern for certain cases of the antenna system shown;

[0027] Figure 20 yes Figure 3 The three-dimensional gain pattern of the antenna system shown is illustrated under certain conditions.

[0028] Figure 21 yes Figure 3 The two-dimensional gain pattern of the antenna system shown is illustrated in certain cases.

[0029] Figure 22 This is a graph showing the total efficiency and return loss of the antenna system under certain conditions for the first antenna provided in the embodiments of this application;

[0030] Figure 23 This is a graph showing the total efficiency and return loss of the antenna system under certain conditions for the second antenna provided in the embodiments of this application;

[0031] Figure 24 This is a graph showing the overall efficiency and return loss of the antenna system for the third antenna provided in this application embodiment;

[0032] Figure 25 This is an isolation curve diagram of the first and second antennas provided in the embodiments of this application under certain conditions;

[0033] Figure 26 This is an isolation curve diagram of the first and third antennas provided in the embodiments of this application under certain conditions;

[0034] Figure 27 This is an isolation curve diagram of the second and third antennas under certain conditions provided in the embodiments of this application.

[0035] Figure Labels

[0036] 100 - Terminal device; 101 - Substrate; 102 - Frame; 1021 - First side; 1022 - Second side; 20 - Antenna system; 21 - First antenna; 211 - First radiator; 212 - First feed section; 22 - Second antenna; 221 - Second radiator; 2211 - First radiator; 2211a - First radiator of the second antenna; 2211b - First radiator of the third antenna; 2212 - Second radiator; 222 - Second feed section; 23 - Third antenna; 232 - Third feed section; 30 - Radio frequency Chip; 301 - First capacitor; 302 - Second capacitor; 303 - Third capacitor; 304 - Fourth capacitor; 305 - Fifth capacitor; 306 - Sixth capacitor; 307 - Seventh capacitor; 308 - Eighth capacitor; 309 - Ninth capacitor; 401 - First inductor; 402 - Second inductor; 403 - Third inductor; 404 - Fourth inductor; 405 - Fifth inductor; 406 - Sixth inductor; 407 - Seventh inductor; 408 - Eighth inductor; M1 - First matching circuit; M2 - Second matching circuit; M3 - Third matching circuit. Detailed Implementation

[0037] Explanation of some terms.

[0038] Radiator (or antenna stub): This is the device in an antenna used to receive / transmit electromagnetic wave radiation. In some cases, the term "antenna" in a narrow sense refers to the radiator (or antenna stub), 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 (or antenna stub) via a feed line. The radiator (or antenna stub) converts this energy into electromagnetic wave energy of a specific polarization and radiates it in the desired direction. The receiving radiator (or antenna stub) converts the electromagnetic wave energy of a specific polarization from a specific direction in space back into modulated high-frequency current energy, which is then transmitted to the receiver input via a feed line.

[0039] Radiators (or antenna stubs) may include conductors with specific shapes and sizes, such as wires or sheets, and this application does not limit the specific shape. In one embodiment, a linear radiator (or antenna stub) may be simply referred to as a wire antenna. In one embodiment, a linear radiator may be implemented by a conductive frame, and may also be referred to as a frame antenna. In one embodiment, a linear radiator (or antenna stub) may be implemented by a support conductor, and may also be referred to as a support antenna. In one embodiment, the diameter (e.g., including thickness and width) of the linear radiator, or the radiator of the wire antenna, is much smaller than the wavelength (e.g., the wavelength of the medium) (e.g., less than 1 / 16 of the wavelength), and the length may be comparable to the wavelength (e.g., the wavelength of the medium) (e.g., a length of approximately 1 / 8 of the wavelength, or 1 / 8 to 1 / 4, or 1 / 4 to 1 / 2, or longer). The main forms of wire antennas include dipole antennas, half-wave dipole antennas, monopole antennas, loop antennas, inverted F antennas (also known as IFA, Inverted F Antenna), and planar inverted F antennas (also known as PIFA, Planar Inverted F Antenna). For example, in the case of a dipole antenna, each dipole antenna typically includes two radiating stubs, each of which is fed from the feed end of the radiating stub by a feed section. For example, an inverted-F antenna (IFA) can be considered as a monopole antenna with an added ground path. An IFA antenna has one feed point and one ground point, and is called an inverted-F antenna because its side view is inverted-F shaped. In one embodiment, the sheet radiator (or antenna stub) may include a microstrip antenna or a patch antenna. In one embodiment, the sheet radiator (or antenna stub) may be implemented using a planar conductor (e.g., a conductive sheet or conductive coating). In one embodiment, the sheet radiator (or antenna stub) may include a conductive sheet, such as a copper sheet. In one embodiment, the sheet radiator (or antenna stub) may include a conductive coating, such as silver paste. The shape of the sheet radiator includes circular, rectangular, and annular shapes, and this application does not limit the specific shape. A microstrip antenna typically consists of a dielectric substrate, a radiator (or antenna stub), and a ground plane, with the dielectric substrate positioned between the radiator (or antenna stub) and the ground plane.

[0040] Radiators (or antenna stubs) may also include slots or gaps formed on a conductor, for example, closed or semi-closed slots or gaps formed on a grounded conductor surface. In one embodiment, a slotted or slit radiator may be simply referred to as a slot antenna or a gap antenna. In one embodiment, the radial dimension (e.g., including width) of the slot or gap of the slot antenna / gap antenna is much smaller than the wavelength (e.g., the dielectric wavelength) (e.g., less than 1 / 16 of the wavelength), while the length dimension may be comparable to the wavelength (e.g., the dielectric wavelength) (e.g., a length of approximately 1 / 8 of the wavelength, or 1 / 8 to 1 / 4, or 1 / 4 to 1 / 2, or longer). In one embodiment, a radiator with a closed slot or gap may be simply referred to as a closed slot antenna. In one embodiment, a radiator with a semi-closed slot or gap (e.g., an opening added to a closed slot or gap) may be simply referred to as an open slot antenna. In some embodiments, the gap shape is elongated. In some embodiments, the length of the gap is approximately half a wavelength (e.g., the dielectric wavelength). In some embodiments, the length of the gap is approximately an integer multiple of a wavelength (e.g., one dielectric wavelength). In some embodiments, the slot can be fed by transmission lines connected across one or both sides, thereby exciting a radio frequency electromagnetic field on the slot and radiating electromagnetic waves into space. In one embodiment, the radiator of the slot antenna or gap antenna can be implemented by a conductive frame grounded at both ends, also known as a frame antenna; in this embodiment, the slot antenna or gap antenna can be viewed as including a linear radiator, the linear radiator being spaced apart from the ground and grounded at both ends, thereby forming a closed or semi-closed slot or gap. In one embodiment, the radiator of the slot antenna or gap antenna can be implemented by a support conductor grounded at both ends, also known as a support antenna.

[0041] Ground / Plug: This can broadly refer to at least a portion of any grounding layer, ground plane, or grounding metal layer within an electronic device (such as a mobile phone), or at least a portion of any combination of the aforementioned grounding layers, ground planes, or grounding components. "Ground / Plug" can be used for grounding components within an electronic device. In one embodiment, "Ground / Plug" may include any one or more of the following: a grounding layer of a circuit board of an electronic device, a ground plane formed by the frame of the electronic device, a grounding metal layer formed by a thin metal film beneath the screen, a conductive grounding layer of a battery, and conductive or metallic components electrically connected to the aforementioned grounding layer / ground plane / metal layer. In one embodiment, the circuit board may be a printed circuit board (PCB), such as an 8-layer, 10-layer, or 12-14-layer board having 8, 10, 12, 13, or 14 layers of conductive material, or components separated and electrically insulated by dielectric or insulating layers such as glass fiber or polymers. In one embodiment, the circuit board includes a dielectric substrate, a grounding layer, and a trace layer, with the trace layer and grounding layer electrically connected via vias. In one embodiment, components such as displays, touchscreens, input buttons, transmitters, processors, memory, batteries, charging circuits, and system-on-chip (SoC) architectures can be mounted on or connected to a circuit board; or electrically connected to trace layers and / or ground layers in the circuit board. For example, an RF source is disposed on a trace layer.

[0042] 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.

[0043] Grounding: refers to coupling with the aforementioned ground / floor via a grounding structure and / or grounding circuit. In one embodiment, grounding can be achieved through physical grounding, such as through a structural component of the mid-frame to achieve physical grounding at a specific location on the frame (or, physical ground). In another embodiment, grounding can be achieved through device grounding, such as through devices like capacitors / inductors / resistors connected in series or parallel (or, device ground).

[0044] Resonance / 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. The return loss characteristic of the center frequency can be less than -20dB. It should be understood that, unless otherwise specified, in the phrase "generating the first resonance" mentioned in this application, the first resonance should be the fundamental mode resonance generated by the antenna / radiator, or the lowest frequency resonance generated by the antenna / radiator in a certain antenna mode. It should be understood that the antenna / radiator can generate one or more antenna modes according to a specific design, and each antenna mode can correspond to a fundamental mode resonance.

[0045] 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.

[0046] Communication band / operating 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, the antenna's operating band includes the B40 band. The frequency range that meets the specifications can be considered the antenna's operating band.

[0047] The resonant frequency band and the operating frequency band may be the same or different, or their frequency ranges may partially overlap. In one embodiment, one or more resonant frequency bands of the antenna may cover one or more operating frequency bands of the antenna.

[0048] Electrical length: can be the ratio of physical length (i.e., mechanical length or geometric length) to the wavelength of the transmitted electromagnetic wave. Electrical length can satisfy the following formula:

[0049] Where L is the physical length and λ is the wavelength of the electromagnetic wave.

[0050] Wavelength: or operating wavelength, can be the wavelength corresponding to the center frequency of the resonant frequency or the center frequency of the operating frequency band supported by the antenna. For example, assuming the center frequency of the B1 uplink band (the resonant frequency includes any frequency in the range of 1920MHz to 1980MHz) includes 1955MHz, then the operating wavelength can be the wavelength calculated using this frequency of 1955MHz. 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.

[0051] It should be understood that wavelength (operating wavelength) can be understood as the wavelength of an electromagnetic wave in a medium. For example, the wavelength of an electromagnetic wave generated by a radiator propagating in a medium and the wavelength propagating in a vacuum satisfy the following formula:

[0052]

[0053] Wherein, λε is the wavelength of the electromagnetic wave in the medium, λc is the wavelength of the electromagnetic wave in vacuum, and εr is the relative permittivity of the medium in the dielectric layer. In the embodiments of this application, the wavelength typically refers to the dielectric wavelength, which can be the dielectric wavelength corresponding to the center frequency of the resonant frequency, or the dielectric wavelength corresponding to the center frequency of the operating frequency band supported by the antenna. For example, assuming the center frequency of the B1 uplink band (the resonant frequency includes any frequency in the range of 1920MHz to 1980MHz) includes 1955MHz, then the wavelength can be the dielectric wavelength calculated using this frequency. Not limited to the center frequency, the "dielectric wavelength" can also refer to the dielectric wavelength corresponding to the non-center frequency of the resonant frequency or the operating frequency band. For ease of understanding, the dielectric wavelength mentioned in the embodiments of this application can be simply calculated using the relative permittivity of the dielectric filling one or more sides of the radiator.

[0054] 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.

[0055] The grounding structure / feed unit may include connectors, such as metal springs, and the radiator is coupled to the ground via the grounding structure / the feed unit is coupled to the feed circuit. In some embodiments, the feed unit may include a transmission line / feed wire, and the grounding structure may include a ground wire.

[0056] A feed line, also called a transmission line, is the connection line between the antenna transceiver and the radiator. Transmission lines can transmit current waves or electromagnetic waves directly, depending on the frequency and type. The connection point on the radiator where the transmission line connects is usually called the feed point. Transmission lines include conductive transmission lines, coaxial transmission lines, waveguides, and microstrip lines. Depending on their implementation, transmission lines can be mounted on a support antenna or a glass antenna. Depending on the carrier, transmission lines can be made of LCP (Liquid Crystal Polymer), FPC (Flexible Printed Circuit), or PCB (Printed Circuit Board).

[0057] End / Point: The term "end / point" in the context of the antenna radiator's first end / second end / feed end / ground end / feed point / ground point / connection point should not be narrowly interpreted as an endpoint or end that is physically disconnected from other radiators. It can also be considered as a point or segment on a continuous radiator. In one embodiment, "end / point" may include a connection / coupling region on the antenna radiator that is coupled to other conductive structures. For example, a feed end / feed point may be a coupling region on the antenna radiator that is coupled to a feed section (e.g., a region facing a part of the feed section). Similarly, a ground end / ground point may be a connection / coupling region on the antenna radiator that is coupled to a grounding structure.

[0058] Open terminal, closed terminal: In some embodiments, open terminal and closed terminal are, for example, relative to whether or not they are grounded; the closed terminal is grounded, and the open terminal is not grounded. In some embodiments, open terminal and closed terminal are, for example, relative to other conductors; the closed terminal is electrically connected to other conductors, and the open terminal is not electrically connected to other conductors. In one embodiment, the open terminal may also be referred to as a floating terminal, free terminal, open terminal, or open-circuit terminal. In one embodiment, the closed terminal may also be referred to as a ground terminal or short-circuit terminal. It should be understood that in some embodiments, other conductors can be coupled through the open terminal to transfer coupled energy (which can be understood as transferring current).

[0059] In some embodiments, the understanding of "closed end" can also be from the perspective of current distribution. A closed end or ground end can be understood as a point of high current or low electric field on a radiator. In one embodiment, coupling electronic devices (e.g., capacitors, inductors, etc.) through a closed end can maintain the current distribution characteristics of the point of high current / low electric field. In one embodiment, opening a slit at or near the closed end (e.g., filling the slit with insulating material) can maintain the current distribution characteristics of the point of high current / low electric field.

[0060] In some embodiments, the understanding of "open terminal" can also be from the perspective of current distribution. An open terminal or a floating terminal can be understood as a point with a small current or a point with a large electric field on the radiator. In one embodiment, coupling electronic devices (e.g., capacitors, inductors, etc.) through an open terminal can maintain the current distribution characteristics of the point with a small current or a large electric field.

[0061] It should be understood that when an electronic device (e.g., capacitor, inductor, etc.) is coupled at the radiator end of a gap (which, from the perspective of the radiator's structure, resembles a radiator at the opening of an open or suspended end), the radiator end can be a point with a large current / small electric field. In this case, it should be understood that the radiator end at the gap is actually a closed end or a grounded end, etc.

[0062] The current unidirectional / reverse 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 / reverse direction. For example, when a unidirectional current is excited on a bent or looped conductor (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, but still fall under the definition of unidirectional current in this application. In one embodiment, unidirectional current on a conductor can mean that the current on that conductor has no reversal point. In one embodiment, reversible current on a conductor can mean that the current on that conductor has at least one reversal point. In one embodiment, unidirectional current on two conductors can mean that the currents on both conductors have no reversal points and flow in the same direction. In one embodiment, reversible current on two conductors can mean that the currents on both conductors have no reversal points and flow in opposite directions. The unidirectional / reverse current on multiple conductors can be understood accordingly.

[0063] The terms "middle" or "middle position" mentioned in the embodiments of this application refer to certain ranges or distances. For example, the middle (position) of a conductor can be a section of the conductor including the midpoint, or the middle (position) of a conductor can be a section of the conductor that is less than a predetermined threshold (e.g., 1 mm, 2 mm, or 2.5 mm) from the midpoint.

[0064] Antenna system efficiency (total efficiency): refers to the ratio of input power to output power at the antenna port.

[0065] Antenna radiation efficiency refers to the ratio of the power radiated into space by an antenna (i.e., the power effectively converted into electromagnetic waves) to the active power input to the antenna. Active power input to the antenna = antenna input power - loss power; loss power mainly includes return loss power and ohmic loss power of metals and / or dielectric loss power. Radiation efficiency is a measure of an antenna's radiation capability; metal loss and dielectric loss are both factors affecting radiation efficiency.

[0066] 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.

[0067] 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.

[0068] 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. The S11 parameter is usually negative. The smaller the S11 parameter, the smaller the antenna return loss, the less energy the antenna reflects back, meaning more energy actually enters the antenna, and the higher the antenna's system efficiency. Conversely, the larger the S11 parameter, the greater the antenna return loss, and the lower the antenna's system efficiency. It should be noted that in engineering, an S11 value of -6dB is generally used as a standard. When the antenna's S11 value is less than -6dB, the antenna can be considered to be operating normally, or its transmission efficiency can be considered to be good.

[0069] Electrical conduction and electrical disconnection: Electrical conduction can be understood as exhibiting low impedance characteristics within the operating frequency band, while electrical disconnection can be understood as exhibiting high impedance characteristics within the operating frequency band.

[0070] Parallelism: The parallelism defined in this application is not limited to absolute parallelism. This definition of parallelism can be understood as basic parallelism. It allows for situations where the parallelism is not absolute due to factors such as assembly tolerance, design tolerance, and structural flatness. It also allows for errors within a small angular range, such as within 10 degrees of assembly error. These can all be considered as parallel relationships.

[0071] Perpendicularity: The perpendicularity defined in this application is not limited to an absolute perpendicular intersection (with an included angle of 90 degrees). It is permissible for non-absolute perpendicular intersections caused by factors such as assembly tolerances, design tolerances, and structural flatness. It is permissible for errors within a small angular range, such as an assembly error range of 80 to 100 degrees, which can all be understood as a perpendicular relationship.

[0072] 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.

[0073] The possible embodiments of this application are described below with reference to the accompanying drawings.

[0074] Currently, GPS navigation on mobile phones has become commonplace, widely used in daily travel, location services, and many other fields. However, existing GPS antenna technologies typically only focus on application scenarios where the user holds the phone with the screen perpendicular to the ground plane. Antenna performance also focuses only on the radiation pattern and gain in this scenario. But there is another common application scenario: users usually hold their phone screen parallel to the ground plane to indicate the direction of travel using arrow icons in map applications. At the same time, the mobile device needs to receive GPS satellite signals to obtain the user's accurate location. In this scenario, the ideal GPS antenna radiation pattern should be perpendicular to the phone screen and point towards the satellite. In addition, due to the Faraday rotation effect, satellite signals undergo polarization rotation during air-to-ground transmission. Therefore, GPS antennas on satellites are usually circularly polarized antennas, and mobile terminals also tend to use circularly polarized antennas, which can reduce polarization mismatch loss compared to linearly polarized antennas. In existing technologies, GPS antennas are usually made using the phone's metal frame, FPC, etc., and the implementation method is the same as conventional antennas, achieved by exciting a 1 / 4λ (wavelength corresponding to the operating frequency) metal stub. The current mode is singular, and it can only excite linearly polarized antennas. To achieve circular polarization, theoretically, two mutually orthogonal polarization current components are required. Therefore, current technologies typically require adding an extra metal branch to achieve circular polarization, either using frame metal, metal decorative parts on the battery back cover, or placing the camera, pressure bar, and side parts on the back of the terminal device. All of these methods severely compress antenna space. Alternatively, a second polarization component can be achieved through metal structural parts on the back of the phone (such as camera decorative parts), which presents issues such as production consistency problems and radiation pattern distortion. In addition, since modern mobile phones need to support numerous frequency bands, and antenna space and quantity are limited, achieving support for multiple frequency bands with limited antenna size and quantity while ensuring good performance and isolation of each antenna has always been a challenge in the industry.

[0075] This application proposes an antenna system and terminal device that achieves circularly polarized radiation without introducing additional metal stubs into the antenna system. This frees up space for other antennas and avoids signal crosstalk between different antennas, thereby enabling high-quality signal transmission across multiple frequency bands within a limited space. By incorporating the antenna system within the terminal device, circularly polarized radiation on the screen side can be achieved using the side bezel of the terminal device, without occupying the front substrate, such as the front screen, thus contributing to a pleasing appearance for the terminal device.

[0076] The antenna system provided in this application embodiment is applied to terminal devices. Terminal devices can be portable terminals, often held in the hand during use, such as mobile phones, tablets, wearable devices, etc. Taking mobile phones as an example, the terminal device provided in this application embodiment may be a tablet device or a foldable device. For foldable devices, the terminal device provided in this application embodiment can be a bi-fold device (including inward-folding and outward-folding devices) or a multi-fold device (e.g., a tri-fold device). The antenna system provided in this application embodiment can also be applied to wearable devices, such as smartwatches.

[0077] Figure 1 This is a schematic diagram of a terminal device 100 provided in one embodiment of this application. (See attached diagram.) Figure 1 In one embodiment, the terminal device 100 is a tablet device. The terminal device 100 includes a substrate 101 and a frame 102. The substrate 101 can be used to display images, videos, etc., for example, the substrate 101 can be a display screen. The frame 102 is disposed around the edge of the substrate 101. The substrate 101 and the back cover of the terminal device 100 are disposed opposite each other. In one embodiment, the frame 102 and the back cover can be independent structural components, with the frame 102 connected between the substrate 101 and the back cover. The terminal device 100 includes an antenna system 20 and a radio frequency chip 30, with at least a portion of the radiators of the antenna system 20 formed on the frame 102. Figure 1The portion within the L-shaped dashed box schematically represents at least a part of the antenna system 20. The antenna system 20 includes a first antenna 21, a second antenna 22, and a third antenna 23. The first antenna 21 includes a first radiator 211 and a first feed section 212. The second radiator 221 includes an electrically connected first radiator 2211 and a second radiator 2212. The second antenna 22 includes a second feed section 222 and a first radiator 2211a of the second antenna 22. The third antenna 23 includes a third feed section 232 and a first radiator 2211b of the third antenna 23. That is, the first radiator 2211 can be divided into two parts: one part is fed by the second feed section 222, and the other part is fed by the third feed section 232. The second antenna 22 and the third antenna 23 are a shared antenna system using the first radiator 2211. In one embodiment, an RF signal is transmitted from the RF chip 30 to the first feed unit 212, and the first feed unit 212 receives the RF signal, thereby stimulating the first radiator 211. The RF chip 30 also transmits an RF signal to the second feed unit 222, and the second feed unit 222 receives the RF signal, thereby stimulating the first radiator 2211a of the second antenna 22. Finally, the RF chip 30 transmits an RF signal to the third feed unit 232, and the third feed unit 232 receives the RF signal, thereby stimulating the first radiator 2211b of the third antenna 23.

[0078] See Figure 1 In one embodiment, the frame 102 includes an inner surface and an outer surface disposed opposite to each other. The inner surface faces the internal space of the terminal device, and the outer surface is the external appearance of the terminal device. A first power supply unit 212 is located on one side of the inner surface of the frame 102 and connected to a first radiator 211. A second power supply unit 222 is located on one side of the inner surface of the frame 102 and connected to the first radiator 2211. A third power supply unit 232 is located on one side of the inner surface of the frame 102 and connected to the first radiator 2211. In one embodiment, the first power supply unit 212, the second power supply unit 222, and the third power supply unit 232 can all be electrically connected to a power supply circuit on a circuit board inside the terminal device 100 via a metal spring or an RF wire. The power supply circuit is electrically connected to the RF chip 30 and is used to receive RF signals. In one embodiment, the power supply circuit may include a matching circuit, a tuning circuit, etc. In one embodiment, the first power supply unit 212, the second power supply unit 222, and the third power supply unit 232 may also be equipped with devices, switches, etc., to achieve power supply matching. In one embodiment, multiple antenna systems 20 can be disposed on the frame 102, for example, Figure 1 In the embodiment shown, the antenna system 20 can be installed on both the portion of the frame 102 near the top of the terminal device and the portion of the frame 102 at the bottom of the terminal device.

[0079] Figure 2This is a schematic diagram of the antenna system 20 of a terminal device provided in one embodiment of this application, in conjunction with... Figure 1 and Figure 2 As shown, the antenna system 20 includes a first antenna 21, a second antenna 22, a third antenna 23, a first matching circuit M1, a second matching circuit M2, and a third matching circuit M3. The first antenna 21 includes a first radiator 211 and a first feed section 212. The second radiator 221 includes a first radiator 2211 and a second radiator 2212 electrically connected. The second antenna 22 includes a second feed section 222 and a first radiator 2211a of the second antenna 22. The first antenna 21 and the second antenna 22 belong to different communication standards. For example, the first antenna 21 and the second antenna 22 can be antennas from different systems; the first antenna 21 can be a cellular antenna, and the second antenna 22 can be a Wi-Fi antenna. Alternatively, the first antenna 21 and the second antenna 22 can be antennas operating at different frequency bands within the same system; the first antenna 21 can be a low-IF antenna, and the second antenna 22 can be a high-frequency antenna. Both the first radiator 211 and the second radiator 221 are mounted on the frame 102 of the terminal device 100. In one embodiment, the frame 102 includes a first side 1021 and a second side 1022. Both the first radiator 211 and the first radiating portion 2211 can be located on the first side 1021. The first radiating portion 2211 is at least partially located on the extension path of the first radiator 211, that is, the extension direction of the first radiator 211 coincides with the extension direction of the first radiating portion 2211. The extension path of the first radiator 211 can be understood as the extension path of the main radiating branch of the first radiator 211. For example, the first radiator 211 may include a main radiating branch and a device disposed on the main radiating branch. This device can be used to adjust the frequency or match the impedance, etc. The main radiating branch can be straight, arc-shaped, etc. The main radiating branch of the first radiating portion 2211 can be located on the extension path of the first radiator 211, such as... Figure 2 As shown, the main radiating branches of the first radiator 211 are linear. The first side 1021 is perpendicular to the second side 1022, and the second radiating part 2212 can be located on the second side 1022. That is, the extension path of the main radiating branch of the second radiating part 2212 can be perpendicular to the extension path of the first radiator 211 and the main radiating branch of the first radiator 2211, that is, the extension direction of the second radiating part 2212 is perpendicular to the extension direction of the first radiator 211.

[0080] Figure 3 This is a schematic diagram of the antenna system 20 of the terminal device 100 provided in another embodiment of this application, in conjunction with... Figure 1 , Figure 2 and Figure 3As shown, when the first feed section 212 receives power and directly generates an excitation current i11a on the first radiator 211, schematically, the excitation current i11a can be transmitted between the first grounding point A and the first opening B. Simultaneously, the second radiator 2212, perpendicular to the first radiator 211, can generate a coupling current i11b under capacitive coupling. Schematably, the coupling current i11b can be transmitted mainly between the end of the second radiator 2212 near the first radiator 2211 and the third grounding point F. Schematably, the direction of the excitation current i11a is mainly towards... Figure 3 As shown in the X direction, the direction of the coupling current i11b is mainly towards... Figure 3 The Y-direction shown is generated by capacitive coupling of the coupling current i11b. The excitation current i11a and the coupling current i11b are orthogonal, meaning their directions are perpendicular. The current intensities of the excitation current i11a and the coupling current i11b are equal, and the phase of the coupling current i11b leads the phase of the excitation current i11a by 90 degrees. This 90-degree phase difference generates a circularly polarized resonance propagating along a direction perpendicular to the plane formed by the first radiator 211 and the second radiator 221. Schematably, the first feed section 212 receives the feed and excites the first radiator 211 and the second radiator 2212 to jointly generate a circularly polarized resonance propagating along a direction perpendicular to the substrate 101. That is, the circularly polarized resonance can propagate along... Figure 1 The signal propagates in the Z direction as shown. The second matching circuit M2 can guide the excitation current i11a to ground to prevent the excitation current from continuously acting on the first radiating part 2211, thereby preventing the first radiating part 2211 from emitting crosstalk signals. This is beneficial for the antenna system 20 to achieve high-quality signal transmission with circular polarization resonance.

[0081] Combination Figure 1 , Figure 2 and Figure 3 As shown, in one possible implementation, the terminal device 100 can be a mobile phone, a square earphone case, a watch, etc. The application scenario for mobile phones and watches can be GPS satellite positioning, which requires the use of circularly polarized radiation propagating in a direction perpendicular to the substrate 101 to improve the efficiency of GPS positioning signal transmission and reception. The application scenario for the square earphone case is as follows: the user wears earphones and holds the earphone case; the microphone of the earphone case serves as the input of user commands, and the circularly polarized radiation output from the earphone case's antenna system 20 is transmitted to the earphones. The earphones then act as a relay to transmit signals to the mobile phone, ultimately achieving high-quality signal reception and transmission.

[0082] Figure 4 This is a schematic diagram of the antenna system 20 of the terminal device 100 provided in another embodiment of this application, in conjunction with... Figure 1 , Figure 2 and Figure 4 As shown, the first feed unit 212 is electrically connected to the first radiator 211 and is used to receive feed to excite the first radiator 211 to generate a first resonance. Indicatively, the current excited on the first radiator 211 by the feed received by the first feed unit 212 can be... Figure 4 As shown in i12, the current i12 can be transmitted between the feed point of the first feed section 212 and the first opening B. The first matching circuit M1 is electrically connected between the first feed section 212 and the first radiator 211. The first matching circuit M1 is used to ground the feed received by the second feed section 222, that is, the first matching circuit M1 guides the feed received by the second feed section 222 to ground, so that the feed received by the second feed section 222 will not excite the first radiator 211. In other words, the first matching circuit M1 isolates the inactive first antenna 21 from the active second antenna 22. When the second feed section 222 receives the feed and excites the first radiator 2211 to generate a second resonance, the first matching circuit M1 can guide the feed to ground to prevent the feed from continuously acting on the first radiator 211, thereby preventing the first radiator 211 from emitting crosstalk signals to the second resonance. This is beneficial for the antenna system 20 to achieve high-quality signal transmission of the first resonance.

[0083] Figure 5 This is a schematic diagram of the antenna system 20 of the terminal device 100 provided in another embodiment of this application, in conjunction with... Figure 1 , Figure 2 and Figure 5 As shown, the second feed section 222 is electrically connected to the first radiating section 2211 and is used to receive feed to excite the first radiating section 2211a of the second antenna 22 to generate a second resonance. Indicatively, the current excited on the first radiating section 2211 by the feed received by the second feed section 222 can be... Figure 5 The current i21 shown can be transmitted between the second grounding point D and the second opening C. The second matching circuit M2 is electrically connected between the second feed section 222 and the first radiating section 2211. The second matching circuit M2 is used to ground the feed received by the first feed section 212, that is, the second matching circuit M2 guides the feed received by the first feed section 212 to ground, so that the feed received by the first feed section 212 will not excite the first radiating section 2211. In other words, the second matching circuit M2 isolates the inactive second antenna 22 from the active first antenna 21. When the first feed section 212 receives another feed and excites the first radiating section 211 to generate the first resonance, the second matching circuit M2 can also guide this feed to ground to prevent the feed from continuously acting on the first radiating section 2211, thereby preventing the first radiating section 2211 from emitting crosstalk signals to the first resonance. This is beneficial for the antenna system 20 to achieve high-quality signal transmission of the second resonance.

[0084] Combination Figure 1 , Figure 3 , Figure 4 and Figure 5 As shown, the circular polarization resonance process of the first radiator 211 and the second radiator 2212 is not crosstalked by the first radiator 2211; the first resonance process of the first radiator 211 of the first antenna 21 is not crosstalked by the radiator of the second antenna 22; and the second resonance process of the radiator of the second antenna 22 is not crosstalked by the radiator of the first antenna 21. This achieves mutual isolation between the first antenna 21, the second antenna 22, and the second radiator 2212. Ultimately, the antenna system 20 achieves high-quality signal transmission across multiple frequency bands, including circular polarization resonance, the first resonance, and the second resonance. Furthermore, by providing the antenna system 20 in the terminal device 100, circular polarization radiation perpendicular to the substrate 101, such as perpendicular to the screen direction, can be achieved using the side frame of the terminal device 100, without occupying the front substrate of the terminal device 100, such as the front screen, thus contributing to a good appearance of the terminal device 100.

[0085] Combination Figure 1 , Figure 3 , Figure 4 and Figure 5 As shown, in one possible implementation, circular polarization resonance can be used for satellite communication, millimeter-wave radar, or UAV signal transmission. The circular polarization resonance generated by the first radiator 211 and the second radiator 2212 of the first antenna 21 covers GPS L1. By making the circular polarization resonance cover GPS L1, it is beneficial for the antenna system to achieve efficient signal transmission in applications such as satellite communication, millimeter-wave radar, or UAV signal transmission. The first resonance generated by the first radiator 211 of the first antenna 21 covers WiFi 2.4G, and the second resonance generated by the first radiator 2211 of the second antenna 22 covers WiFi 5G. By making the first resonance cover WiFi 2.4G and the second resonance cover WiFi 5G, it is beneficial for the antenna system 10 to simultaneously possess the ability to transmit and receive signals over a wide range and at a high speed.

[0086] Combination Figure 1 , Figure 3 , Figure 4 and Figure 5As shown, in one possible implementation, the second matching circuit M2 can be used to isolate the GPS L1 of the first radiator 211 and the second radiator 2212, and to isolate the WiFi 2.4G of the first radiator. This can improve the isolation of the second matching circuit M2 from the current in the operating frequency band of the first radiator 211 and the second radiator 2212, and reduce the crosstalk effect of the first radiator 2211 on the signal transmission of the first radiator 211 and the second radiator 2212. Schematic, when the first antenna 21 operates in the GPS L1 (1.57542GHz) band and the WiFi 2.4 band, the second matching circuit M2 can be grounded to the 1.57542GHz feed and the 2.4GHz feed, thereby reducing the crosstalk effect of the second antenna 22 on the radiated signals emitted by the first antenna 21 in the GPS L1 (1.57542GHz) band and the WiFi 2.4 band.

[0087] Figure 6 This is a schematic diagram of the cooperative structure of the second power supply section 222 and the second matching circuit M2 provided in one embodiment of this application, combined with... Figure 2 and Figure 6 As shown, in one possible implementation, the second matching circuit M2 includes a first capacitor 301 and a first inductor 401. The circuit combining the first capacitor 301 and the first inductor 401 is connected in parallel with the second feed section 222, and the first capacitor 301 and the first inductor 401 are connected in series. The circuit combining the first capacitor 301 and the first inductor 401 can ground the excitation current received by the first feed section 212 and directly generated on the first radiator 211, thereby preventing the first radiator 2211 from being excited due to matching the operating frequency band of the first radiator 211, which is beneficial for the radiation signal emitted by the first radiator 211 to not be affected by crosstalk from the second antenna 22. It should be noted that... Figure 6 The second matching circuit M2 shown is only one possible embodiment. The second matching circuit M2 can also achieve the effect of isolating the second antenna 22 from the first antenna 21 through other equivalent circuit combinations.

[0088] Combination Figure 2 and Figure 6As shown, in one possible implementation, the circuit combining the first capacitor 301 and the first inductor 401 operates at a frequency of 2.4 GHz. The first capacitor and the first inductor are used to isolate the WiFi 2.4G signal from the first radiator. The first radiator 211 is used to generate a first resonance under the excitation of the 2.4 GHz feed. When the first antenna 21 operates in the 2.4 GHz band, the second matching circuit M2 can guide the 2.4 GHz feed received by the first feed section 212 to ground, so that the 2.4 GHz feed received by the first feed section 212 will not excite the second antenna 22. This can further improve the isolation of the second matching circuit M2 from the current in the operating frequency band of the first radiator 211, and further reduce the crosstalk effect of the first radiator 2211 on the signal transmission of the first radiator 211.

[0089] Figure 7 This is a schematic diagram of the cooperative structure of the first power supply unit 212 and the first matching circuit M1 provided in one embodiment of this application, in conjunction with... Figure 2 and Figure 8 As shown, in one possible implementation, the first matching circuit M1 includes a second capacitor 302, a third capacitor 303, a second inductor 402, and a third inductor 403. The circuit consisting of the second inductor 402, the third capacitor 303, the third inductor 403, and the first power supply section 212 is connected in parallel with the second capacitor 302. The circuit consisting of the third capacitor 303, the third inductor 403, and the first power supply section 212 is connected in series with the second inductor 402. The circuit consisting of the third inductor 403 and the first power supply section 212 is connected in parallel with the third capacitor 303. The third inductor 403 is connected in series with the first power supply section 212. By employing a low-pass filter consisting of a two-stage parallel capacitor and a series inductor, where the combination of the second capacitor 302 and the second inductor 402 forms a single stage, and the combination of the third capacitor 303 and the third inductor 403 forms a two-stage stage, the first matching circuit M1 operates within the passband of the first radiator 211's operating frequency band and within the stopband of the excitation current generated by the second feed section 222 on the first radiator 2211. This means the first matching circuit M1 can guide the feed received by the second antenna 22 to ground. This ensures the isolation between the first matching circuit M1 and the excitation current generated by the second feed section 222 on the first radiator 2211, reducing crosstalk between the first radiator 211 and the signal transmission of the first radiator 2211. In other words, it ensures the isolation between the first antenna 21 and the second antenna 22, reducing crosstalk between the first antenna 21 and the radiated signal emitted by the second antenna 22. It should be noted that... Figure 7 The first matching circuit M1 shown is only one possible embodiment. The first matching circuit M1 can also achieve the effect of isolating the first antenna 21 and the second antenna 22 in the high-frequency band through other equivalent circuit combinations.

[0090] Figure 8 This is a schematic diagram of the cooperative structure of the first power supply unit 212 and the first matching circuit M1 provided in another embodiment of this application, in conjunction with... Figure 2 and Figure 8 As shown, in one possible implementation, the first matching circuit M1 includes a second capacitor 302, a third capacitor 303, a second inductor 402, a third inductor 403, a fourth capacitor 304, and a fourth inductor 404. The circuit composed of the second inductor 402, the third capacitor 303, the third inductor 403, the fourth capacitor 304, the fourth inductor 404, and the first power supply unit 212 is connected in parallel with the second capacitor 302. The third capacitor 303, the third inductor 403, the fourth capacitor 304, and the fourth inductor 404 are connected in parallel with the second capacitor 302. The circuit consisting of the first power supply unit 212 is connected in series with the second inductor 402. The circuit consisting of the third inductor 403, the fourth capacitor 304, the fourth inductor 404, and the first power supply unit 212 is connected in parallel with the third capacitor 303. The circuit consisting of the fourth capacitor 304, the fourth inductor 404, and the first power supply unit 212 is connected in series with the third inductor 403. The circuit consisting of the fourth inductor 404 and the first power supply unit 212 is connected in parallel with the fourth capacitor 304. The fourth inductor 404 is connected in series with the first power supply unit 212. By employing a three-stage low-pass filter with parallel capacitors and series inductors, where the combination of the second capacitor 302 and the second inductor 402 forms a single stage, the combination of the third capacitor 303 and the third inductor 403 forms a two-stage stage, and the combination of the fourth capacitor 304 and the fourth inductor 404 forms a three-stage stage, it is beneficial to balance the frequency selectivity and impedance matching stability of the first matching circuit M1. This further improves the isolation of the first matching circuit M1 from the excitation current generated by the second feed section 222 on the first radiating section 2211, and reduces the crosstalk effect of the first radiator 211 on the signal transmission of the first radiating section 2211. In other words, it can further improve the isolation between the first antenna 21 and the second antenna 22, and further reduce the crosstalk effect of the first antenna 21 on the radiated signal emitted by the second antenna 22 under excitation. It should be noted that... Figure 8 The first matching circuit M1 shown is only one possible embodiment. The first matching circuit M1 can also achieve the effect of isolating the first antenna 21 and the second antenna 22 in the high-frequency band through other equivalent circuit combinations.

[0091] Combination Figure 2 and Figure 8As shown, in one possible implementation, the first matching circuit M1 is used for grounding a feed frequency greater than 3GHz, meaning the first matching circuit M1 can be used to isolate the WiFi 5G signal from the first radiating element. The first radiating element 2211 is used to generate a second resonance under the excitation of a 5.2GHz feed, meaning the second antenna 22 can operate in the 5.2GHz band. Schematic, the second antenna 22 can be a WiFi 5G antenna. This allows the first matching circuit M1 to ground the high-frequency current, especially the 5.2GHz excitation current generated by the first radiating element 2211 under the feed received by the second feed element 222, further isolating the first radiator 211 from the first radiating element 2211, reducing the crosstalk effect of the first radiator 211 on the signal transmission of the first radiating element 2211 in the WiFi 5G band. This further improves the isolation between the first antenna 21 and the second antenna 22, further reducing the crosstalk effect of the first antenna 21 on the radiated signal emitted by the second antenna 22 under excitation.

[0092] Figure 9 This is a schematic diagram of the antenna system 20 of the terminal device 100 provided in another embodiment of this application, in conjunction with... Figure 2 and Figure 9 As shown, in one possible implementation, the antenna system 20 further includes a third feed section 232 and a third matching circuit M3. The third feed section 232 is electrically connected to the first radiating section 2211 and is used to receive feed. The second feed section 222 is located between the first feed section 212 and the third feed section 232. Schematically, the second antenna 22 and the third antenna 23 share the first radiating section 2211 of the second radiator 221, that is, the second antenna 22 and the third antenna 23 are a shared antenna. The first radiating section 2211 includes the first radiating section 2211a of the second antenna 22 and the first radiating section 2211b of the third antenna 23. The third matching circuit M3 is electrically connected between the third feed section 232 and the first radiating section 2211. The first matching circuit M1 is used to ground the feed received by the second feed section 222 and the feed received by the third feed section 232, that is, the first matching circuit M1 is used to isolate the first antenna 21 from the second antenna 22 and the third antenna 23. The second matching circuit M2 is used to ground the feed received by the first feed unit 212 and the feed received by the third feed unit 232. That is, the second matching circuit M2 is used to isolate the second antenna 22 from the first antenna 21 and the third antenna 23. The third matching circuit M3 is used to ground the feed received by the first feed unit 212 and the feed received by the second feed unit 222. That is, the third matching circuit M3 is used to isolate the third antenna 23 from the first antenna 21 and the second antenna 22. This allows the first antenna 21, the second antenna 22, and the third antenna 23 to each operate in a specific frequency band without signal crosstalk.

[0093] Combination Figure 2 and Figure 9 As shown, in one possible implementation, the third feed section 232 is used to receive power and excite the first radiating section 2211 and the second radiating section 2212 to jointly generate a third resonance, that is, the second radiating section 2212 and the first radiating section 2211b of the third antenna 23 jointly generate a third resonance. Illustratively, the current excited on the second radiating section 2212 and part of the first radiating section 2211 by the power received by the third feed section 232 can be... Figure 9 The current i31 shown can be transmitted between the feed of the third feed section 232 and the third grounding point E. Since the first matching circuit M1 is used to ground the feed received by the second feed section 222 and the feed received by the third feed section 232, and the second matching circuit M2 is used to ground the feed received by the first feed section 212 and the feed received by the third feed section 232, the first matching circuit M1 reduces the crosstalk effect of the first radiator 211 on the signal transmission of the second radiator 221, and the second matching circuit M2 reduces the crosstalk effect of the first radiator 2211a of the second antenna 22 on the signal transmission of the first radiator 211, the second radiator 2212, and the first radiator 2211b of the third antenna 23. The third matching circuit M3 is used to ground the feed received by the first feed unit 212 and the feed received by the second feed unit 222. The third matching circuit M3 can isolate the GPS L1 signal of the first radiator 211 and the second radiator 2212, isolate the WiFi 2.4G signal of the first radiator 211, and isolate the WiFi 5G signal of the first radiator 2211. This reduces the crosstalk effect of the second radiator 2212 and the first radiator 2211b of the third antenna 23 on the signal transmission of the first radiator 211 and the first radiator 2211a of the second antenna 22. Ultimately, this achieves co-radiation of different antennas, namely the second antenna 22 and the third antenna 23, on the second radiator 221, and maximizes the transmission of multi-band signals at circular polarization resonance, first resonance, second resonance, and third resonance within a limited space, while avoiding signal crosstalk between different antennas, thus ensuring the signal quality transmitted by the antenna system 20.

[0094] Figure 10 This is a schematic diagram of the antenna system 20 of a terminal device 100 provided in one embodiment of this application, in conjunction with... Figure 2 and Figure 10As shown, in one possible implementation, both the first radiator 211 and the first radiating part 2211 can be located on the first side 1021. The first radiating part 2211 is at least partially located on the extension path of the first radiator 211, that is, the extension direction of the first radiator 211 coincides with the extension direction of the first radiating part 2211. The extension path of the first radiator 211 can be understood as the extension path of the main radiating branch of the first radiator 211. For example, the first radiator 211 may include the main radiating branch and a device disposed on the main radiating branch. This device can be used to adjust the frequency or match the impedance, etc. The main radiating branch can be straight, arc-shaped, etc. The main radiating branch of the first radiating part 2211 can be located on the extension path of the first radiator 211, such as... Figure 2 As shown, the main radiating branches of the first radiator 211 are linear. The second feed section 222 is used to receive 3.5 GHz and excite the first radiator 211 and the first radiating section 2211 to jointly generate a fourth resonance. The third matching circuit M3 makes the feed point of the third feed section 232 equivalent to a short circuit to ground relative to the high frequency band, such as 3.5 GHz. The first matching circuit M1 makes the feed point of the first feed section 212 equivalent to an open circuit. Therefore, when the second feed section 222 receives the feed, a current i22 can be generated between the feed point of the third feed section 232 and the feed point of the first feed section 212, thereby exciting the first radiator 211 and the first radiating section 2211 to jointly generate a fourth resonance in the 3.5 GHz operating frequency band.

[0095] Combination Figure 2 and Figure 10 As shown, in one possible implementation, the fourth resonance jointly generated by the first radiator 211 and the first radiating section 2211 under the excitation of the feed received by the second feed section 222 can cover n78, that is, the second feed section 222 can receive a 3.5 GHz feed and excite the 1 / 4λ operating mode of the equivalent short stub in the 3.5 GHz frequency band, such as... Figure 10 The current i22 is shown. The third matching circuit M3 can be used to isolate the first radiator and the first radiating part n78, that is, the third matching circuit M3 can be used to ground the 3.5GHz feed received by the second feed part 222 to prevent the 3.5GHz feed from exciting the first radiating part 2211b and the second radiating part 2212 of the third antenna 23.

[0096] Figure 11 This is a schematic diagram of the cooperative structure of the third power supply unit 232 and the third matching circuit M3 provided in another embodiment of this application, in conjunction with... Figure 2 and Figure 11As shown, in one possible implementation, the third matching circuit M3 includes a fifth capacitor 305, which is connected in parallel with the third feed section 232. By providing a capacitor connected in parallel with the third feed section 232 within the third matching circuit M3, the current in the mid-to-high frequency range can be grounded through the fifth capacitor 305, thus preventing the current in the mid-to-high frequency range from continuously acting on the second radiating section 2212 and part of the first radiating section 2211. This improves the isolation of the third matching circuit M3 from the feed received by the first feed section 212 and the second feed section 222. In other words, it improves the isolation of the third antenna 23 relative to the first antenna 21 and the second antenna 22, further reducing the crosstalk effect of the third antenna 23 on the radiated signals emitted by the first antenna 21 and the second antenna 22 when excited. It should be noted that... Figure 11 The third matching circuit M3 shown is only one possible embodiment. The third matching circuit M3 can also achieve the effect of isolating the third antenna 23 from the first antenna 21 and the second antenna 22 in the mid-to-high frequency band through other equivalent circuit combinations.

[0097] Figure 12 This is a schematic diagram of the cooperative structure of the third power supply unit 232 and the third matching circuit M3 provided in another embodiment of this application, in conjunction with... Figure 2 and Figure 12As shown, in one possible implementation, the third matching circuit M3 includes a fifth capacitor 305, a sixth capacitor 306, and a fifth inductor 405. The circuit combining the fifth inductor 405, the sixth capacitor 306, and the third feed section 232 is connected in parallel with the fifth capacitor 305. The circuit combining the fifth inductor 405 and the sixth capacitor 306 is connected in series with the third feed section 232. The fifth inductor 405 and the sixth capacitor 306 are connected in parallel. By adding a resonant circuit of the sixth capacitor 306 and the fifth inductor 405 to the third matching circuit M3, it is beneficial for the third matching circuit M3 to guide the feed received by the first feed section 212 to ground, improve the isolation between the second radiating section 2212 and part of the first radiating section 2211 and the first radiator 211 in the working state, and reduce the crosstalk effect of the second radiating section 2212 and part of the first radiating section 2211 on the signal transmission of the first radiator 211. This improves the isolation of the third antenna 23 relative to the first antenna 21, further reducing the crosstalk effect of the third antenna 23 on the radiated signal emitted by the first antenna 21 under excitation. Specifically, the operating frequency of the circuit composed of the fifth inductor 405 and the sixth capacitor 306 is 1.57542 GHz. By making the operating frequency of the resonant circuit of the sixth capacitor 306 and the fifth inductor 405 on the third matching circuit M3 1.57542 GHz, the isolation between the second radiating part 2212 and part of the first radiating part 2211 under the 1.57542 GHz current excitation is further improved, which is beneficial to reducing the crosstalk effect of the second radiating part 2212 and part of the first radiating part 2211 on the circularly polarized resonance. That is, when the first antenna 21 operates at 1.57542 GHz in the GPS L1 band and generates circular polarization resonance, the third matching circuit M3 can ensure the isolation of the third antenna 23 relative to the first antenna 21, reducing the crosstalk effect of the third antenna 23 on the circular polarization resonance generated by the first antenna 21 operating in the GPS L1 band. It should be noted that... Figure 12 The third matching circuit M3 shown is only one possible embodiment. The third matching circuit M3 can also achieve the effect of isolating the third antenna 23 and the first antenna 21 in the GPS L1 band through other equivalent circuit combinations.

[0098] Figure 13 This is a schematic diagram of the cooperative structure of the third power supply unit 232 and the third matching circuit M3 provided in another embodiment of this application, in conjunction with... Figure 2 and Figure 13As shown, in one possible implementation, the third matching circuit M3 includes a fifth capacitor 305, a sixth capacitor 306, a seventh capacitor 307, a fifth inductor 405, and a sixth inductor 406. The circuit formed by the fifth inductor 405, the sixth inductor 406, the sixth capacitor 306, the seventh capacitor 307, and the third power supply unit 232 is connected in parallel with the fifth capacitor 305. The fifth inductor 405 is connected in parallel with the sixth capacitor 306. The circuit formed by the fifth inductor 405 and the sixth capacitor 306 is connected in series with the circuit formed by the sixth inductor 406, the seventh capacitor 307, and the third power supply unit 232. The circuit formed by the sixth inductor 406 and the third power supply unit 232 is connected in parallel with the seventh capacitor 307. The sixth inductor 406 and the third power supply unit 232 are connected in series. By connecting a seventh capacitor 307 in parallel and a sixth inductor 406 in series in the third matching circuit M3, this low-pass filter circuit configuration makes the third matching circuit M3 a passband for low-frequency currents and a stopband for mid-to-high-frequency currents. This helps to further reduce the crosstalk effects of part of the first radiating element 2211 and the second radiating element 2212 on the first radiator 211 and the other part of the radiating element signal emitted by the second feed element 222. In other words, it improves the isolation of the third antenna 23 relative to the second antenna 22, further reducing the crosstalk effects of the third antenna 23 on the radiated signal emitted by the second antenna 22 under excitation. It should be noted that... Figure 13 The third matching circuit M3 shown is only one possible embodiment. The third matching circuit M3 can also be combined with other equivalent circuits to make the low-frequency current a passband and the mid-to-high frequency current a stopband, thereby achieving the effect of isolating the third antenna 23 from the second antenna 22.

[0099] Combination Figure 2 and Figure 13As shown, in one possible implementation, the circuit composed of the fifth capacitor 305, the fifth inductor 405, the sixth inductor 406, the sixth capacitor 306, the seventh capacitor 307, and the third feed section 232 is used for feeding ground frequencies greater than 1.5 GHz. This makes the third matching circuit M3 a stopband for currents above 1.5 GHz and a passband for currents below 1.5 GHz, which helps ensure that the second radiator 2212 and part of the first radiator 2211 excited by the third feed section 232 operate in the low-frequency band, and reduces the crosstalk effect of part of the first radiator 2211 and the second radiator 2212 on the first radiator 211 and the signal transmission of another part of the first radiator 2211 excited by the second feed section 222. That is, it is beneficial to the isolation of the third antenna 23 relative to the first antenna 21 and the second antenna 22, and further reduces the crosstalk effect of the third antenna 23 on the radiated signals emitted by the first antenna 21 and the second antenna 22 when excited. For example, when the first antenna 21 operates in the GPS L1 (1.57542GHz) band and the WIFI 2.4 band, since the third matching circuit M3 is a stopband above 1.5GHz current, the third matching circuit M3 can be grounded to feed 1.57542GHz and 2.4GHz, thereby reducing the crosstalk effect of the third antenna 23 on the radiated signals emitted by the first antenna 21 in the GPS L1 (1.57542GHz) band and the WIFI 2.4 band.

[0100] Figure 14 This is a schematic diagram of the cooperative structure of the second power supply section 222 and the second matching circuit M2 provided in another embodiment of this application, combined with Figure 2 and Figure 14 As shown, in one possible implementation, the second matching circuit M2 includes a first capacitor 301, an eighth capacitor 308, a first inductor 401, and a seventh inductor 407. The circuit combining the first capacitor 301 and the first inductor 401 is connected in parallel with the circuit combining the seventh inductor 407, the eighth capacitor 308, and the second feed section 222. The first capacitor 301 and the first inductor 401 are connected in series. The circuit combining the seventh inductor 407 and the eighth capacitor 308 is connected in series with the second feed section 222, and the seventh inductor 407 and the eighth capacitor 308 are connected in parallel. By connecting a resonant circuit with the eighth capacitor 308 and the seventh inductor 407 in parallel in the second matching circuit M2, it is beneficial to reduce the crosstalk effect of the portion of the first radiator 2211 that is excited by the second feed section 222 on the signal transmission of the second radiator 2212 and the portion of the first radiator 2211 that is excited by the third feed section 232. This is beneficial to the isolation of the second antenna 22 relative to the third antenna 23, and further reduces the crosstalk effect of the second antenna 22 on the radiated signal emitted by the third antenna 23 under excitation.

[0101] Combination Figure 2 and Figure 14 As shown, in one possible implementation, the second matching circuit M2 can be used to isolate the GPS L5 of the first radiator 2211 and the second radiator 2212. Specifically, the circuit composed of the seventh inductor 407 and the eighth capacitor 308 operates at a frequency of 1.17645 GHz. The first radiator 2211 and the second radiator 2212 are used to jointly generate a third resonance under the excitation of a 1.17645 GHz feed. Schematic, the GPS L5 frequency band is 1.17645 GHz, that is, the third resonance covers GPS L5. Since the third feed section 232 receives a 1.17645GHz feed and excites the second radiator 2212 and part of the first radiator 2211 to jointly generate a third resonance, by making the operating frequency of the circuit composed of the seventh inductor 407 and the eighth capacitor 308 1.17645GHz, it is beneficial for the second matching circuit M2 to guide the 1.17645GHz feed to ground, thereby reducing the crosstalk effect of the first radiator 2211a of the second antenna 22 on the signal transmission of the second radiator 2212 and the first radiator 2211b of the third antenna 23. That is, it is beneficial to the isolation of the second antenna 22 relative to the third antenna 23, further reducing the crosstalk effect of the second antenna 22 on the radiated signal emitted by the third antenna 23 under excitation. For example, when the third antenna 23 operates in the GPS L5 (1.17645GHz) band, since the second matching circuit M2 can also operate in the 1.17645GHz band, it can be grounded to provide 1.17645GHz power, thereby reducing the crosstalk effect of the second antenna 22 on the radiated signal emitted by the third antenna 23 in the GPS L5 (1.17645GHz) band. It should be noted that... Figure 14 The second matching circuit M2 shown is only one possible embodiment. The second matching circuit M2 can also achieve the effect of isolating the second antenna 22 and the third antenna 23 in the GPS L5 band through other equivalent circuit combinations.

[0102] Figure 15 This is a schematic diagram of the cooperative structure of the second power supply section 222 and the second matching circuit M2 provided in another embodiment of this application, combined with Figure 2 and Figure 15As shown, in one possible implementation, the second matching circuit M2 includes a first capacitor 301, an eighth capacitor 308, a ninth capacitor 309, a first inductor 401, a seventh inductor 407, and an eighth inductor 408. The circuit consisting of the first capacitor 301 and the first inductor 401 is connected in parallel with the circuit consisting of the seventh inductor 407, the eighth inductor 408, the eighth capacitor 308, the ninth capacitor 309, and the second power supply section 222. The first capacitor 301 and the first inductor 401 are connected in series. The circuit consisting of the seventh inductor 407 and the eighth capacitor 308 is connected in series with the circuit consisting of the eighth inductor 408, the ninth capacitor 309, and the second power supply section 222. The seventh inductor 407 and the eighth capacitor 308 are connected in parallel. The circuit consisting of the ninth capacitor and the second power supply section 222 is connected in parallel with the eighth inductor 408. The ninth capacitor 309 is connected in series with the second power supply section 222. By forming the aforementioned multi-stage parallel inductor-capacitor high-pass filter resonant circuit in the second matching circuit M2, the second matching circuit M2 becomes a passband for high-frequency currents and a stopband for mid-to-low-frequency currents. This helps to further reduce the crosstalk between the portion of the first radiating part 2211 excited by the second feed section 222 and the first radiating part 211 excited by the third feed section 232, as well as the signal transmission of the second radiating part 2212 and the portion of the first radiating part 2211 excited by the third feed section 232. This ensures the isolation of the second antenna 22 relative to the first antenna 21 and the third antenna 23, further reducing the crosstalk between the second antenna 22 and the radiated signals emitted by the excited first antenna 21 and the third antenna 23. It should be noted that... Figure 15 The second matching circuit M2 shown is only one possible embodiment. The second matching circuit M2 can also be combined with other equivalent circuits to make the high-frequency current a passband and the mid-to-low frequency current a stopband, so as to achieve the effect of isolating the second antenna 22 from the first antenna 21 and the third antenna 23.

[0103] Combination Figure 2 and Figure 15As shown, in one possible implementation, the first radiator 211 and the second radiator 2212 are used to jointly generate circularly polarized resonance under excitation by a 1.57542GHz feed. The second matching circuit M2 is a stopband for low- and mid-frequency currents, and the third matching circuit M3 is a stopband for currents above 1.5GHz, so that when the first radiator 211 and the second radiator 2212 operate in the 1.57542GHz frequency band, the crosstalk effect of the first radiator 2211 excited by the second feed section 222 and the third feed section 232 on the circularly polarized resonance signal can be reduced. That is, when the first antenna 21 operates in the 1.57542GHz frequency band, the feed points of the second antenna 22 and the third antenna 23 can be equivalent to open circuits relative to the first antenna 21. The second matching circuit M2 and the third matching circuit M3 ensure the isolation of the second antenna 22 and the third antenna 23 relative to the first antenna 21, further reducing the crosstalk effect of the second antenna 22 and the third antenna 23 on the circular polarization resonance emitted by the first antenna 21 under the 1.57542GHz feed excitation.

[0104] Figure 16 This is a schematic diagram of the antenna system 20 of the terminal device 100 provided in another embodiment of this application, in conjunction with... Figure 2 and Figure 16 As shown, in one possible implementation, the antenna system 20 further includes a metal spring 50, which is electrically connected to the end of the first radiator 211 away from the first feed section 212. The length direction of the metal spring 50 is perpendicular to the first radiator 211. The metal spring 50 is used to couple with the electromagnetic field of the first radiator 2211 to generate a fifth resonance when the first radiator 2211 generates a second resonance. Illustratively, the current generated by the electromagnetic field coupling between the metal spring 50 and the first radiator 2211 can be... Figure 16 The current i23 shown can flow along... Figure 2 The Y-direction is transmitted along the first radiator 211 and the metal spring 50. When the second feed section 222 receives high-frequency feed, the metal spring 50 can utilize the electromagnetic field of the first radiator 2211 and couple it to obtain a new fifth resonance. Furthermore, both the first matching circuit M1 and the third matching circuit M3 can ground the current i23 to prevent the current i23 from exciting the first radiator 211 and the second radiator 2212 of the first antenna 21, and the first radiator 2211b and the second radiator 2212 of the third antenna 23. This avoids crosstalk between the first antenna 21 and the third antenna 23 and the fifth resonance emitted by the metal spring 50, which is beneficial for the antenna system 20 to achieve high-quality multi-band signal transmission as much as possible within a limited space. For example, the fifth resonance can cover WiFi 6G.

[0105] Figure 17 yes Figure 3The three-dimensional axial ratio radiation pattern of the antenna system 20 shown in some cases. Figure 18 yes Figure 3 The antenna system 20 shown is a two-dimensional axial ratio pattern under certain conditions. Figure 19 yes Figure 3 Another two-dimensional axial ratio radiation pattern of the antenna system 20 shown in certain cases, wherein Figure 18 yes Figure 2 The image shows a cross-sectional view of the axial ratio of the plane formed by the X and Z directions. Figure 19 yes Figure 2 The image shows a cross-sectional view of the axial ratio of the plane formed by the Y and Z directions. (Combined with...) Figure 2 , Figure 3 , Figure 17 , Figure 18 as well as Figure 19 As shown, Figure 2 As shown in the Z direction, which is directly above the plane of the substrate 101 of the terminal device 100 perpendicular to it, the axial ratio is relatively low. According to the definition of axial ratio (AR), AR < 6dB is considered good circularly polarized radiation in engineering applications. This is suitable for applications where the substrate 101 of the terminal device 100 is parallel to the ground plane, and the GPS antenna radiation pattern should be perpendicular to the substrate 101 of the terminal device 100 pointing towards the satellite.

[0106] The axial ratio can be used as a parameter to consider polarization, while the direct parameter that determines the strength of the received signal is the right-hand circular polarization gain pattern. Figure 20 yes Figure 3 The three-dimensional gain pattern of the antenna system shown is for certain situations. Specifically, Figure 20 The right-hand circularly polarized radiation pattern of the first antenna 21 in the GPS L1 band, combined with Figure 2 , Figure 3 and Figure 20 As shown, the main radiation direction of the circularly polarized radiation of the terminal device 100 is towards... Figure 2 The Z direction shown is perpendicular to the substrate 101 and points upwards from the substrate 101. This is beneficial for the terminal device 100 to obtain a stronger GPS signal reception strength.

[0107] Figure 21 yes Figure 3 The two-dimensional gain pattern of the antenna system 20 shown in the figure is shown in certain cases. Specifically, Figure 21 for Figure 20 The yoz cross-section of the radiation pattern shown, combined with Figure 2 , Figure 3 and Figure 21As shown, the antenna system 20 has a 3dB beamwidth of 153 degrees, specifically covering a range of -7.5 to 146 degrees. This allows the terminal device 100 to obtain strong GPS signal reception whether its substrate 101 is parallel to or perpendicular to the ground plane. Compared to traditional technical solutions, the terminal device 100 exhibits superior performance in GPS signal transmission.

[0108] Figure 22 This is a graph showing the overall efficiency and return loss of the antenna system under certain conditions for the first antenna provided in the embodiments of this application, combined with... Figure 2 , Figure 3 , Figure 4 and Figure 22 As shown, curve A1 is the overall efficiency curve of the antenna system of the first antenna 21, and curve A2 is the return loss curve of the first antenna 21. Curve A1 shows the circular polarization resonant peak and the first resonant peak generated by the first antenna 21 under 1.57542GHz and 2.4GHz feed, respectively. It can be seen that the first antenna 21 has high radiation efficiency in both the GPS L1 and WiFi 2.4G operating frequency bands, specifically greater than -4dB.

[0109] Figure 23 This is a graph showing the overall efficiency and return loss of the antenna system under certain conditions for the second antenna provided in the embodiments of this application, combined with... Figure 2 , Figure 5 , Figure 7 , Figure 8 and Figure 23 As shown, curve B1 is the overall efficiency curve of the antenna system of the second antenna 22, curve B2 is the return loss curve of the second antenna 22, and curve B1 shows the fourth resonance peak, the second resonance peak, and the fifth resonance peak generated by the second antenna 22 under 3.5GHz, 5.2GHz, and 5.8GHz feed conditions, respectively. It can be seen that the second antenna 22 has high radiation efficiency in both the n78 operating frequency band and WiFi 5G, specifically greater than -4dB.

[0110] Figure 24 This is a graph showing the overall efficiency and return loss of the antenna system for the third antenna provided in this application embodiment, combined with... Figure 2 , Figure 6 and Figure 24 As shown, curve C1 is the overall efficiency curve of the antenna system of the third antenna 23, and curve C2 is the return loss curve of the third antenna 23. Curve C1 shows the third resonant peak generated by the third antenna 23 under a 1.17645GHz feed. It can be seen that the overall efficiency of the third antenna 23 system in the working frequency band GPS L5 is greater than -8dB, and it has high signal radiation quality.

[0111] Figure 25 This is an isolation curve diagram of the first and second antennas provided in the embodiments of this application under certain conditions. Figure 26 This is an isolation curve diagram of the first and third antennas provided in certain cases according to embodiments of this application. Figure 27 This is an isolation curve diagram of the second and third antennas under certain conditions provided in the embodiments of this application, combined with... Figure 2 , Figure 25 , Figure 26 as well as Figure 27 As shown, curve AB1 is the isolation curve between the first antenna 21 and the second antenna 22, curve AC1 is the isolation curve between the first antenna 21 and the third antenna 23, and curve BC1 is the isolation curve between the second antenna 22 and the third antenna 23. It can be seen that due to the specially configured first matching circuit M1, second matching circuit M2 and third matching circuit M3, the isolation between the first antenna 21, the second antenna 22 and the third antenna 23 is very high.

[0112] It should be understood that in the various embodiments of this application, the order of the above-mentioned processes does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0113] The above description is merely a specific embodiment of this application, but the scope of protection 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 scope of protection of this application. Where there is no conflict, possible embodiments of this application and features thereof can be combined with each other. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An antenna system, characterized by The system includes a first radiator, a second radiator, a first feed section, a second feed section, a first matching circuit, and a second matching circuit. The second radiator includes an electrically connected first radiator and a second radiator. The extension direction of the first radiator is perpendicular to the extension direction of the second radiator. The first feed unit is electrically connected to the first radiator and is used to receive power. The second power supply unit is electrically connected to the first radiating unit and is used to receive power. The first matching circuit is electrically connected between the first feed section and the first radiator. The second matching circuit is electrically connected between the second feed section and the first radiating section. The first matching circuit is used to ground the power received by the second power supply unit. The second matching circuit is used to ground the power received by the first power supply unit; The first feed section is used to receive power and excite the first radiator and the second radiator to jointly generate a circularly polarized resonance propagating in a direction perpendicular to the plane formed by the first radiator and the second radiator. The first feed section is also used to receive power and excite the first radiator to generate a first resonance, and the second feed section is used to receive power and excite the first radiator to generate a second resonance.

2. The antenna system of claim 1, wherein, The circular polarization resonance covers GPS L1, the first resonance covers WiFi 2.4G, and the second resonance covers WiFi 5G.

3. The antenna system of claim 2, wherein, The second matching circuit is used to isolate the GPS L1 of the first radiator and the second radiator, and to isolate the WiFi 2.4G of the first radiator.

4. The antenna system of claim 3, wherein, The second matching circuit includes a first capacitor and a first inductor. The circuit formed by the combination of the first capacitor and the first inductor is connected in parallel with the second power supply section, and the first capacitor and the first inductor are connected in series. The first capacitor and the first inductor are used to isolate the WiFi 2.4G of the first radiator.

5. The antenna system of claim 2, wherein, The first matching circuit is used to isolate the WiFi 5G of the first radiating part.

6. The antenna system of claim 1, wherein, The antenna system further includes a third feed section and a third matching circuit. The third feed section is electrically connected to the first radiating section and is used to receive feed. The second feed section is located between the first feed section and the third feed section. The third matching circuit is electrically connected between the third feed section and the first radiating section. The first matching circuit is used to ground the feed received by the second feed section and the feed received by the third feed section. The second matching circuit is used to ground the feed received by the first feed section and the feed received by the third feed section. The third matching circuit is used to ground the feed received by the first feed section and the feed received by the second feed section. The third feed section is used to receive power and excite the first radiating section and the second radiating section to jointly generate a third resonance.

7. The antenna system of claim 6, wherein, The third matching circuit is used to isolate the GPS L1 of the first radiator and the second radiator, isolate the WiFi 2.4G of the first radiator, and isolate the WiFi 5G of the first radiator.

8. The antenna system of claim 6, wherein, The third resonance covers GPS L5; the second matching circuit is used to isolate GPS L5 of the first radiating part and the second radiating part.

9. The antenna system of claim 6, wherein, The extension direction of the first radiator coincides with the extension direction of the first radiating part, and the second feeding part is used to receive the feeding and excite the first radiator and the first radiating part to jointly generate a fourth resonance.

10. The antenna system of claim 9, wherein, The fourth resonant covers n78; the third matching circuit is used to isolate n78 of the first radiator and the first radiating part.

11. The antenna system of claim 9 or 10, characterized in that The antenna system further includes a metal spring, which is electrically connected to the end of the first radiator away from the first feed section, and the length direction of the metal spring is perpendicular to the first radiator; the metal spring is used to couple with the electromagnetic field of the first radiator to generate a fifth resonance when the first radiator generates a second resonance.

12. A terminal device, comprising: The antenna system includes a frame, a substrate, and the antenna system according to any one of claims 1 to 11, wherein the frame is disposed around the edge of the substrate, the frame includes a first side and a second side that are perpendicular to each other, a first radiator and a first radiating portion are formed on the first side, and a second radiating portion is formed on the second side; the first feed portion is used to receive feed and excite the first radiator and the second radiating portion to jointly generate a circularly polarized resonance propagating in a direction perpendicular to the substrate.

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