Antenna structure and communication device

Abstract

This application provides an antenna structure and communication device to address the technical problem that the second or fourth harmonics of interference signals with resonant frequencies lower than the communication frequency band easily fall into the communication frequency band, affecting communication. In this antenna structure, a feed point is provided on the radiator; one end of a capacitor structure is coupled to the feed point, and the other end of the capacitor structure is configured to receive radio frequency signals; one end of an inductor structure is coupled to the radiator, and the other end of the inductor structure is configured to be grounded. The capacitor and inductor structures are used to suppress resonances with resonant frequencies lower than the communication frequency band of the antenna structure, thereby preventing the harmonics of interference resonances from falling into the communication frequency band, i.e., preventing signals from falling into the passband, and thus improving communication performance.

Description

Technical Field

[0001] This application relates to the field of communication equipment technology, specifically to an antenna structure and a communication device. Background Technology

[0002] Communication devices (such as routers and base stations) typically transmit and receive electromagnetic signals through antenna structures. Communication devices generally have certain communication frequency bands (such as the WIFI band, Bluetooth band, etc.). However, the second or fourth harmonic of interference signals with resonant frequencies lower than the communication frequency band can easily fall into the communication frequency band, affecting communication. Utility Model Content

[0003] This application provides an antenna structure and communication device that can reduce or eliminate the influence of interference signals.

[0004] In a first aspect, embodiments of this application provide an antenna structure, including: a radiator, a capacitor structure, and an inductor structure. A feed point is provided on the radiator; one end of the capacitor structure is coupled to the feed point, and the other end of the capacitor structure is configured to receive radio frequency signals; one end of the inductor structure is coupled to the radiator, and the other end of the inductor structure is configured to be grounded; wherein, the capacitor structure and the inductor structure are used to suppress resonance generation in the communication frequency band of the antenna structure that is lower than the resonant frequency.

[0005] Through the above settings, the capacitor and inductor structures are used to suppress the generation of resonance in the communication band where the resonant frequency is lower than that of the antenna structure. In other words, the capacitor and inductor structures can suppress the generation of interference resonances where the resonant frequency is lower than that of the communication band, thereby preventing the harmonic resonances (such as second, third, and fourth harmonics) of interference resonances from falling into the communication band, i.e., preventing the signal from falling into the passband, and thus improving communication performance.

[0006] In some embodiments that may include the above embodiments, the communication frequency band of the antenna structure includes the WiFi frequency band. For example, the communication frequency band of the antenna structure may be the 2.4GHz frequency band. Correspondingly, the capacitor structure and the inductor structure can suppress the generation of noise resonance at around 600MHz and around 1.2GHz, so as to avoid the harmonics of the noise resonance falling into the communication frequency band.

[0007] In some embodiments that may include the above embodiments, the communication frequency band of the antenna structure includes the WiFi frequency band. For example, the communication frequency band of the antenna structure may also be the 5GHz frequency band. Correspondingly, the capacitor structure and the inductor structure can suppress the generation of noise resonance at around 1.25GHz and around 2.5GHz, so as to avoid the harmonics of the noise resonance falling into the communication frequency band.

[0008] In some embodiments that may include the above embodiments, the radiator includes a first stub and a second stub, the feed point includes a first feed point and a second feed point, the first feed point is located on the first stub, the second feed point is located on the second stub, one end of the capacitor structure is coupled to the first feed point, and the other end of the capacitor structure and the second feed point are configured to be fed in an antisymmetric manner; one end of the inductor structure is coupled to the first stub, and the other end of the inductor structure is coupled to the second stub.

[0009] In some embodiments that may include the above-described examples, the antenna structure includes a dielectric substrate, with both the first stub and the second stub disposed on a first surface of the dielectric substrate. This arrangement allows the dielectric substrate to support and fix the first and second stubs, facilitating the installation and disassembly of the antenna structure.

[0010] For example, the material of the dielectric substrate may include plastic, rubber, fiberglass board (FR-4), etc. The first and second branches may include a metal layer or a metal support disposed on the dielectric substrate.

[0011] In some embodiments that may include the above-described embodiments, the inductor structure includes a conductor disposed on a second surface of a dielectric substrate, one end of which is coupled to a first stub, and the other end of which is coupled to a second stub; the first and second surfaces are disposed opposite to each other. This arrangement, with the inductor structure and the radiator located on different surfaces of the dielectric substrate, avoids the inductor structure from affecting the radiator's signal transmission and reception.

[0012] It is understandable that the conductor may include a metal layer or conductive lines disposed on the second surface. By appropriately setting the conductor material and shape, the impedance of the conductor can be adjusted, thereby adjusting the inductance value of the inductor structure.

[0013] In some embodiments that may include the above-described embodiments, one end of the conductor passes through the dielectric substrate and is coupled to the first stub, while the other end of the conductor passes through the dielectric substrate and is coupled to the second stub. That is, a first through-hole and a second through-hole are provided on the dielectric substrate. The first through-hole extends to the first stub, and the second through-hole extends to the second stub. One end of the conductor is located within the first through-hole for coupling with the first stub, and the other end of the conductor is located within the second through-hole for coupling with the second stub, facilitating the connection between the conductor and the first and second stubs.

[0014] In some embodiments that may include the above embodiments, there is a first distance (shortest distance) between the first feed point and the location where the first branch and conductor are coupled, and there is a second distance (shortest distance) between the second feed point and the location where the second branch and conductor are coupled. The embodiments of this application do not limit the first distance and the second distance. The first distance and the second distance can be reasonably set according to the capacitance value of the capacitor structure, the inductance value of the inductor structure, and the communication frequency to suppress the generation of noise resonance with a resonant frequency lower than the communication frequency band.

[0015] In some embodiments that may include the above-described embodiments, the antenna structure includes a dielectric substrate, a first stub disposed on a first surface of the dielectric substrate, and a second stub disposed on a second surface of the dielectric substrate, with the first and second surfaces disposed opposite to each other. This arrangement, with the first and second stubs disposed on different surfaces of the dielectric substrate, can reduce the volume of the radiator, thereby reducing the volume of the antenna structure and facilitating the miniaturization of communication equipment.

[0016] In some embodiments that may include the above-described examples, the inductor structure includes a conductor that passes through a dielectric substrate. One end of the conductor is coupled to a first stub, and the other end is coupled to a second stub. It is understood that since the first and second stubs are located on different surfaces of the dielectric substrate, a through-hole can be provided at the overlapping position of the projections of the first and second stubs onto the dielectric. A corresponding conductor can be disposed within this through-hole, with one end coupled to the first stub and the other end coupled to the second stub. Through this arrangement, the conductor passes through the dielectric substrate, further improving the structural compactness of the antenna structure and facilitating miniaturization of the antenna structure.

[0017] In some embodiments that may include the above-described embodiments, the first branch includes a first arc-shaped portion, a second arc-shaped portion, and a first connecting portion. Both the first and second arc-shaped portions are arc-shaped, and their center lines are collinear. The first connecting portion is located between the first and second arc-shaped portions and is coupled to both. A first feed point is located on the first connecting portion. This configuration reduces the space occupied by the first branch, facilitating miniaturization.

[0018] In some embodiments that may include the above-described embodiments, the second branch includes a third arcuate portion, a fourth arcuate portion, and a second connecting portion. Both the third and fourth arcuate portions are arc-shaped, and their centerlines are collinear. The second connecting portion is located between the third and fourth arcuate portions and is coupled to both. A second feed point is located on the second connecting portion. The centerlines of the first and third arcuate portions are collinear, and the projections of the first, second, third, and fourth arcuate portions onto the dielectric substrate are spaced apart around the centerline of the first arcuate portion. This arrangement reduces the space occupied by the arcuate third and fourth arcuate portions, facilitating miniaturization.

[0019] In the above implementation, the center lines of the first arc-shaped portion and the third arc-shaped portion are collinear, and the projections of the first, second, third, and fourth arc-shaped portions onto the dielectric substrate are spaced apart around the center line of the first arc-shaped portion. In some examples, the first, second, third, and fourth arc-shaped portions can be arranged approximately centrally symmetrically, so that the radiator is a current-current loop and the antenna structure is a magnetic dipole antenna, which can improve the stability of signal transmission.

[0020] In some embodiments that may include the above-described embodiments, the capacitor structure includes a first electrode and a second electrode, which are spaced apart. A radiator near the feed point serves as the second electrode, and the first electrode is configured to receive radio frequency signals. This configuration, using a radiator near the feed point as the second electrode of the capacitor structure, simplifies the antenna structure and facilitates miniaturization.

[0021] In some embodiments that may include the above-described embodiments, a plurality of first protrusions and a plurality of first recesses are alternately arranged on the first electrode plate, and a plurality of second protrusions and a plurality of second recesses are alternately arranged on the second electrode plate. Each first protrusion is embedded in a second recess, and each second protrusion is embedded in a first recess. This arrangement can increase the effective area of ​​the first and second electrode plates, allowing for the fabrication of a capacitor structure with a larger capacitance value within a smaller area.

[0022] In some embodiments that may include the above embodiments, the communication frequency band of the antenna structure includes the WIFI frequency band.

[0023] Secondly, embodiments of this application provide a communication device, including: a radio frequency (RF) device and an antenna structure as described above, wherein the RF device is coupled to a capacitor structure. The communication device in this application includes the antenna structure of any of the above embodiments, thus achieving the same technical effects and solving the same technical problems. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the connection of the antenna structure provided in the embodiments of this application;

[0025] Figure 2 This is a schematic diagram of the structure of a communication device provided in an embodiment of this application;

[0026] Figure 3 This is a schematic diagram of the connection of the communication device provided in the embodiments of this application;

[0027] Figure 4 A schematic diagram of the antenna structure provided in the embodiments of this application. Figure 1 ;

[0028] Figure 5 A schematic diagram of the antenna structure provided in the embodiments of this application. Figure 2 ;

[0029] Figure 6 for Figure 5 A magnified view of a section at point A in the middle;

[0030] Figure 7 This is an equivalent circuit diagram of the antenna structure provided in the embodiments of this application;

[0031] Figure 8 This is a schematic diagram of the antenna structure in related technologies. Figure 1 ;

[0032] Figure 9 for Figure 8 The S-curve diagram of the antenna structure shown.

[0033] Figure 10 for Figure 5 The simulated return loss curve of the antenna structure shown is presented.

[0034] Figure 11 for Figure 5 The simulated antenna efficiency curve of the antenna structure shown is displayed.

[0035] Figure 12 for Figure 5 The measured antenna efficiency diagram of the antenna structure shown.

[0036] Figure 13 A schematic diagram of the antenna structure provided in the embodiments of this application. Figure 3 ;

[0037] Figure 14 A schematic diagram of the antenna structure provided in the embodiments of this application. Figure 4 ;

[0038] Figure 15 for Figure 14 A magnified view of a section at point B in the middle;

[0039] Figure 16 This is a schematic diagram of the antenna structure in related technologies. Figure 2 ;

[0040] Figure 17 This is a schematic diagram of the antenna structure in related technologies. Figure 3 ;

[0041] Figure 18 for Figure 16 and Figure 17 The S-curve diagram of the antenna structure shown.

[0042] Figure 19 for Figure 13 and Figure 14 The simulated return loss curve of the antenna structure shown is presented.

[0043] Figure 20 for Figure 13 and Figure 14 The simulated antenna efficiency curve of the antenna structure shown is displayed.

[0044] Figure 21 for Figure 13 and Figure 14 The measured antenna efficiency diagram of the antenna structure shown is presented.

[0045] Explanation of reference numerals in the attached figures: 10: Radio frequency device; 20: Radio frequency front-end module; 30: Antenna structure; 101: First radio frequency device; 102: Second radio frequency device; 201: First radio frequency front-end module; 202: Second radio frequency front-end module; 203: Third radio frequency front-end module; 204: Fourth radio frequency front-end module; 310: First antenna structure; 320: Second antenna structure; 330: Radiator; 331: First stub; 332: Second stub; m: First feed point; n: Second feed point; 335: First arcuate portion; 336: Second arcuate portion; 3 37: First connecting part; 338: Third arc-shaped part; 339: Second connecting part; 340: Capacitor structure; 341: First electrode plate; 342: Second electrode plate; 343: First protrusion; 344: First recess; 345: Second protrusion; 346: Second recess; 347: Fourth arc-shaped part; 350: Inductor structure; 351: Conductor; 360: Dielectric plate; 361: First surface; 362: Second surface; 401: Main chip; 410: Motherboard; 420: Heat sink; 431: First switching device; 432: Second switching device. Detailed Implementation

[0046] The technical solutions of the embodiments of this application will be described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0047] Hereinafter, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature.

[0048] Furthermore, in the embodiments of this application, directional terms such as "up," "down," "left," "right," "horizontal," and "vertical" are defined relative to the orientation of the components shown in the accompanying drawings. It should be understood that these directional terms are relative concepts, used for relative description and clarification, and can change accordingly depending on the orientation of the components in the accompanying drawings.

[0049] In the embodiments of this application, unless otherwise explicitly specified and limited, the term "connection" should be interpreted broadly. For example, "connection" can be a fixed connection, an electrical connection, a detachable connection, or an integral part; it can be a direct connection or an indirect connection through an intermediate medium.

[0050] 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.

[0051] 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 is the center frequency. The return loss characteristic of the center frequency can be less than -20dB. It should be understood that, unless otherwise specified, when the antenna / radiator mentioned in this application generates "first / second...resonance," the first resonance should be the fundamental mode resonance generated by the antenna / radiator, or in other words, the lowest frequency resonance generated by the antenna / radiator. It should be understood that the antenna / radiator can generate one or more antenna modes according to a specific design, and each antenna mode can correspond to a fundamental mode resonance.

[0052] 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.

[0053] Communication / Operating Frequency Band: Regardless of the type of antenna, it always operates within a certain frequency range (bandwidth). For example, an antenna supporting the B40 band operates within the frequency range of 2300MHz to 2400MHz, or in other words, its operating frequency band includes the B40 band. The frequency range that meets the specifications can be considered the antenna's operating frequency band. The width of the operating frequency band is called the operating bandwidth. The operating bandwidth of an omnidirectional antenna may reach 3-5% of the center frequency. The operating bandwidth of a directional antenna may reach 5-10% of the center frequency. Bandwidth can be considered as a frequency range on both sides of the center frequency (e.g., the resonant frequency of a dipole), where the antenna characteristics are within the acceptable range of the center frequency.

[0054] The resonant frequency band and the operating frequency band can be the same or can partially overlap. In one embodiment, one or more resonant frequency bands of the antenna can cover one or more operating frequency bands of the antenna.

[0055] 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.

[0056] 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.

[0057] In one embodiment, the S11 diagram can be understood as a schematic diagram representing the resonance generated by the antenna. In one embodiment, the resonance shown in the S11 diagram within the range of -6dB can be understood as the resonant frequency / frequency range / operating frequency band generated by the antenna. The S11 parameter is usually negative. The smaller the S11 parameter, the smaller the antenna return loss, the less energy reflected back by the antenna itself, which means more energy actually enters the antenna, and the higher the system efficiency of the antenna. The larger the S11 parameter, the greater the antenna return loss, and the lower the system efficiency of the antenna.

[0058] It should be noted that in engineering, an S11 value of -6dB is generally used as the standard. When the S11 value of an antenna is less than -6dB, it can be considered that the antenna can work normally or that the antenna has good transmission efficiency.

[0059] End / Point: The term "end / point" in the context of the antenna radiator's first end / second end / feed end / ground end / feed point / ground point / connection point should not be narrowly interpreted as necessarily an endpoint or end physically disconnected from other radiators. It can also be considered a point or segment on a continuous radiator. In one embodiment, "end / point" can include a connection / coupling region on the antenna radiator that couples to other conductive structures. For example, a feed end / feed point can be a coupling region on the antenna radiator that couples to a feed structure or feed circuit (e.g., a region facing a part of the feed circuit). Similarly, a ground end / ground point can be a connection / coupling region on the antenna radiator that couples to a ground structure or ground circuit.

[0060] Ground state: This corresponds to the lowest frequency resonance produced by a radiator or a radiator in a certain antenna mode. The "ground state position" or "ground state resonance frequency" refers to the frequency range or resonance frequency point corresponding to the ground state (e.g., the lowest frequency resonance) of the radiator in a specific antenna mode. "Ground state" can also be called "fundamental mode." Corresponding to "ground state" are "higher order" or "higher-order mode / higher-order mode," or "harmonic generation" (e.g., third harmonic, fifth harmonic). Unless otherwise specified, "resonance" in this application refers to resonance in the ground state, or resonance generated by the fundamental mode. In this application, "higher-order mode corresponding to the first resonance" should be understood as at least one higher-order mode generated by the antenna mode corresponding to the first resonance.

[0061] This application provides a communication device suitable for using one or more of the following communication technologies: Bluetooth (BT), Wireless Fidelity (WiFi), 5G, and other future communication technologies. The communication device in this application may include a communication base station, a Telematics-BOX (T-BOX), a router, a mobile phone, a tablet computer, customer premises equipment (CPE), a smart bracelet, a smartwatch, a smart helmet, and smart glasses.

[0062] In the embodiments of this application, please refer to Figure 1The communication equipment may include a radio frequency (RF) device 10, an RF front-end module 20, and an antenna structure 30. The RF device 10 is coupled to the antenna structure 30 through the RF front-end module 20. The RF device 10 can transmit RF signals to the RF front-end module 20. The RF front-end module 20 processes the RF signals and then transmits them to the antenna structure 30 to radiate electromagnetic signals outward. Of course, after the antenna structure 30 receives external electromagnetic signals, it forms electrical signals. The RF front-end module 20 can process these electrical signals and then transmit them to the RF device 10 to achieve the reception of electromagnetic signals.

[0063] For example, the radio frequency device 10 may include a radio frequency chip (FRIC) or other device capable of radio frequency signal processing. The radio frequency front-end module 20 may include a low noise amplifier (LNA), a power amplifier (PA), a filter, etc.; wherein, the low noise amplifier can amplify the signal received by the antenna structure 30 and send the amplified signal to the radio frequency chip to improve sensitivity; the power amplifier can amplify the radio frequency signal emitted by the radio frequency chip and send the amplified signal to the antenna structure 30 to improve the power of the antenna structure 30; the filter can filter the signal between the radio frequency chip and the antenna structure 30 to remove noise.

[0064] Please refer to Figure 2 In some embodiments, the communication device may include a router, which may include a housing, a motherboard 410 and a heat sink 420. The housing forms an accommodating space, the motherboard 410 is erected in the accommodating space, and the heat sink 420 is connected to the motherboard 410. The heat sink 420 may be configured to dissipate heat from the motherboard 410 to prevent the motherboard 410 from overheating.

[0065] In some implementations, the antenna structure 30 may include a first antenna structure 310 and a second antenna structure 320. The communication frequency band of the first antenna structure 310 and the second antenna structure 320 are different. For example, the communication frequency band of the first antenna structure 310 may be the 2.4 GHz band (e.g., 2.35 GHz - 2.5 GHz), and the communication frequency band of the second antenna structure 320 may be the 5 GHz band (e.g., 5.15 GHz - 5.825 GHz). The first antenna structure 310 has a lower communication frequency, resulting in stronger signal penetration and a wider coverage area; the second antenna structure 320 has a higher communication frequency, resulting in higher transmission speed.

[0066] Continue to refer to Figure 2In some implementations, there can be multiple first antenna structures 310 and second antenna structures 320. Several first antenna structures 310 can be positioned on the top of the motherboard 410, while the remaining first antenna structures 310 are arranged around the top of the motherboard 410. The polarization direction of each first antenna structure 310 can be different, allowing the router to adapt to devices with different polarization directions (such as mobile phones), thus improving versatility. Similarly, several second antenna structures 320 can be spaced apart around the top of the motherboard 410, while the remaining second antenna structures 320 can be located in a heat dissipation area, such as on a heatsink 420. The polarization direction of each second antenna structure 320 can also be different, allowing the router to adapt to devices with different polarization directions (such as mobile phones), thus improving versatility.

[0067] In some examples, the first antenna structure 310 and the second antenna structure 320 can be integrated together to improve integration.

[0068] Please refer to Figure 3 In the implementation of the communication device including a router, the communication device may further include a main chip 401. The radio frequency device 10 may include a first radio frequency device 101 and a second radio frequency device 102. The main chip 401 is coupled to the first radio frequency device 101 and the second radio frequency device 102. The main chip 401 can control the operation of the first radio frequency device 101 and the second radio frequency device 102. The first radio frequency device 101 can transmit and receive signals in the 2.4 GHz band, and the second radio frequency device 102 can transmit and receive signals in the 5 GHz band. The radio frequency front-end module 20 includes a first radio frequency front-end module 201 and a second radio frequency front-end module 202. The first radio frequency front-end module 201 is coupled to both a first antenna structure 310 and the first radio frequency device 101, and the second radio frequency front-end module 202 is coupled to both another first antenna structure 310 and the first radio frequency device 101.

[0069] In some examples, the second antenna structure 320 may include five, with two of them located in the space at the top of the motherboard 410. These two second antenna structures 320 can be omnidirectional antennas, meaning they radiate uniformly in a 360° horizontal pattern. The gain of these two second antenna structures 320 can be set relatively high (i.e., the second antenna structure 320 is an omnidirectional high-gain antenna) to ensure good communication performance in all directions.

[0070] The remaining three second antenna structures 320 can be installed on the heat sink 420. One of the second antenna structures 320 can be a horizontally polarized antenna, meaning its polarization direction is horizontal. Appropriately increasing the gain of this second antenna structure 320 (i.e., making it a horizontally polarized high-gain antenna) can ensure its communication performance. The other two second antenna structures 320 can both be dual-polarized antennas, meaning each second antenna structure 320 includes two perpendicular polarization directions, allowing it to adapt to devices with different polarizations. These two second antenna structures 320 can be positioned relative to each other, for example, one on the left side of the heat sink 420 and the other on the right side. Both second antenna structures 320 can also be directional antennas (i.e., one is a left-side dual-polarized directional antenna, and the other is a right-side dual-polarized directional antenna) to ensure communication quality on both the left and right sides of the heat sink 420.

[0071] Continue to refer to Figure 3 In the above implementation, the communication device further includes a first switching device 431 and a second switching device 432. The radio frequency front-end module 20 may also include a third radio frequency front-end module 203 and a fourth radio frequency front-end module 204. The third radio frequency front-end module 203 and the fourth radio frequency front-end module 204 are all coupled to the second radio frequency device 102. The first switching device 431 is coupled to the third radio frequency front-end module 203, a second antenna structure 320 located in the top space of the motherboard 410, and three second antenna structures 320 disposed on the heat sink 420. The first switching device 431 can control the third radio frequency front-end module 203 to be coupled to the second radio frequency device 102. One second antenna structure 320 in the top space of the motherboard 410 is coupled to one of the three second antenna structures 320 disposed on the heat sink 420; the second switch device 432 is coupled to the fourth RF front-end module 204, another second antenna structure 320 in the top space of the motherboard 410, and two second antenna structures 320 disposed on the left and right sides of the heat sink 420. The second switch device 432 can control the fourth RF front-end module 204 to be coupled to one of the other second antenna structure 320 in the top space of the motherboard 410 and one of the two second antenna structures 320 disposed on the left and right sides of the heat sink 420.

[0072] Please refer to Figure 4In this embodiment, the antenna structure 30 includes a radiator 330, which is a device in the antenna used to receive / transmit electromagnetic wave radiation. In some cases, the term "antenna" is narrowly interpreted as the radiator 330, 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 RF front-end module is transmitted to the radiator 330, which converts it into electromagnetic wave energy of a certain polarization and radiates it in the desired direction. The radiator 330 converts electromagnetic wave energy of a certain polarization from a specific direction in space into current energy and delivers it to the RF front-end module.

[0073] Radiator 330 may include a conductor with a specific shape and size, such as a wire or a sheet, and this application does not limit the specific shape. In one embodiment, the wire radiator 330 may be simply referred to as a wire antenna. The main forms of wire antennas include dipole antennas, half-wave dipole antennas, monopole antennas, loop antennas, and inverted-F antennas (also known as IFAs). For example, an inverted-F antenna can be considered as a monopole antenna with an added ground path. An IFA antenna has a feed point and a ground point, and is called an inverted-F antenna because it is roughly inverted-F shaped. In one embodiment, the sheet radiator 330 may include a microstrip antenna or a patch antenna, such as a planar inverted-F antenna (also known as a PIFA).

[0074] In other embodiments, the radiator 330 may also include a slot or gap formed on a conductor, for example, a closed or semi-closed slot or gap formed on the surface of a grounded conductor. In one embodiment, the slotted or slitted radiator 330 may be simply referred to as a slot antenna or a gap antenna.

[0075] Continue to refer to Figure 4 In this embodiment, the antenna structure 30 further includes a capacitor structure 340 and an inductor structure 350. A feed point is provided on the radiator 330. One end of the capacitor structure 340 is coupled to the feed point, and the other end of the capacitor structure 340 is configured to receive radio frequency signals. That is, the other end of the capacitor structure 340 is coupled to the radio frequency front-end module 20 to receive radio frequency signals, i.e., the capacitor structure 340 and the radiator 330 are connected in series. One end of the inductor structure 350 is coupled to the radiator 330, and the other end of the inductor structure 350 is configured to be grounded, i.e., the inductor structure 350 and the radiator 330 are connected in parallel.

[0076] It is understandable that capacitor structure 340 can be understood as lumped capacitance and / or distributed capacitance. Lumped capacitance refers to capacitive components, such as capacitor elements; distributed capacitance (or distributed capacitance) refers to the equivalent capacitance formed by two conductive components separated by a certain gap. Inductor structure 350 can be understood as lumped inductance and / or distributed inductance. Lumped inductance refers to inductive components, such as inductor elements; distributed inductance (or distributed inductance) refers to the equivalent inductance formed by a conductive component of a certain length (such as a conductive sheet, wire, etc.), for example, the equivalent inductance formed by conductor 351 due to curling or rotation.

[0077] In this application embodiment, grounding can be understood as coupling with the ground or floor in the communication equipment. For example, the ground or floor may include at least a portion of any grounding layer, grounding plate, or grounding metal layer within the communication equipment, or at least a portion of any combination of any of the aforementioned grounding layers, grounding plates, or grounding components. The ground or floor can be used for grounding components within the communication equipment. In one embodiment, the ground or floor may include any one or more of the following: a grounding layer of the motherboard of the communication equipment, a grounded heat sink in the communication equipment, and a conductive component or metal component electrically connected to the aforementioned grounding layer / grounding plate / metal layer.

[0078] In this embodiment, the capacitor structure 340 and the inductor structure 350 are used to suppress the generation of resonance in the communication frequency band with a resonant frequency lower than that of the antenna structure 30. In other words, the capacitor structure 340 and the inductor structure 350 can suppress the generation of interference resonance with a resonant frequency lower than that of the communication frequency band, thereby preventing the harmonic resonance (such as second harmonic, third harmonic, fourth harmonic, etc.) of the interference resonance from falling into the communication frequency band, that is, preventing the signal from falling into the passband, thereby improving the communication performance.

[0079] In some implementations, the communication frequency band of the antenna structure 30 can be the 2.4GHz band (such as the first antenna structure 310). Correspondingly, the capacitor structure 340 and the inductor structure 350 can suppress the generation of noise resonance at around 600MHz and around 1.2GHz, so as to avoid the harmonics of the noise resonance falling into the communication frequency band.

[0080] In other implementations, the communication frequency band of antenna structure 30 can also be the 5GHz band (such as the second antenna structure 320). Correspondingly, capacitor structure 340 and inductor structure 350 can suppress noise resonance at around 1.25GHz and around 2.5GHz to prevent the harmonics of noise resonance from falling into the communication frequency band.

[0081] It is understood that the capacitance value of the capacitor structure 340 and the inductance value of the inductor structure 350 in this embodiment are not limited. The capacitance value of the capacitor structure 340 and the inductance value of the inductor structure 350 can be reasonably set according to the communication frequency band of the antenna structure 30 so that the capacitor structure 340 and the inductor structure 350 can suppress the generation of noise resonance with a resonant frequency lower than the communication frequency band.

[0082] Please refer to Figure 5 and Figure 6 ,in, Figure 5 and Figure 4 These are views of the antenna structure from two different directions. Figure 6 for Figure 5 In the enlarged view at point A, in some embodiments, the antenna structure 30 may include a dipole antenna. Correspondingly, the radiator 330 may include a first stub 331 and a second stub 332. The feed points include a first feed point m and a second feed point n. The first feed point m is located on the first stub 331, and the second feed point n is located on the second stub 332. One end of a capacitor is coupled to the first feed point m. The other end of the capacitor structure 340 and the second feed point n are configured to be fed in an antisymmetric manner. That is, the RF signals fed into the other end of the capacitor structure 340 and the second feed point n have the same amplitude, the same frequency, and a phase difference of 180°.

[0083] For example, the RF front-end module 20 can be coupled to the antenna structure 30 via a coaxial cable, wherein the outer conductor of the coaxial cable can be coupled to the second feed point n, and the inner conductor of the coaxial cable can be coupled to the other end of the capacitor structure 340. Of course, this embodiment of the application is not limited to this, and the RF front-end module 20 can also be coupled to the antenna structure 30 via other cables.

[0084] Please refer to Figure 5 and Figure 7 In some implementations, one end of the inductor structure 350 is coupled to the first stub 331, and the other end of the inductor structure 350 is coupled to the second stub 332. Since the antenna structure 30 is a dipole antenna, the coupling of one end of the inductor structure 350 to the first stub 331 and the coupling of the other end of the inductor structure 350 to the second stub 332 is equivalent to the inductor structure 350 being connected in parallel with the radiator 330.

[0085] In some embodiments, the antenna structure 30 includes a dielectric substrate 360, with a first stub 331 and a second stub 332 both disposed on a first surface of the dielectric substrate 360. This configuration allows the dielectric substrate 360 ​​to support and fix the first stub 331 and the second stub 332, facilitating the installation and removal of the antenna structure 30.

[0086] For example, the material of the dielectric substrate 360 ​​may include plastic, rubber, fiberglass board (FR-4), etc. The first branch 331 and the second branch 332 may include a metal layer or a metal support disposed on the dielectric substrate 360, etc., and the embodiments of this application do not limit this.

[0087] Continue to refer to Figure 5 and Figure 6 In some embodiments, the inductor structure 350 includes a conductor 351 disposed on a second surface of the dielectric substrate 360, one end of which is coupled to a first stub 331, and the other end of which is coupled to a second stub 332; the first and second surfaces are disposed opposite to each other. This arrangement places the inductor structure 350 and the radiator 330 on different surfaces of the dielectric substrate 360, thus preventing the inductor structure 350 from affecting the radiator 330's signal transmission and reception.

[0088] It is understood that conductor 351 may include a metal layer or conductive lines disposed on the second surface 362. By reasonably setting the material and shape of conductor 351, the impedance of conductor 351 can be adjusted, thereby adjusting the inductance value of inductor structure 350.

[0089] In some implementations, one end of conductor 351 passes through dielectric slab 360 and couples with the first branch 331, while the other end of conductor 351 passes through dielectric slab 360 and couples with the second branch 332. That is, dielectric slab 360 has a first through-hole and a second through-hole. The first through-hole extends to the first branch 331, and the second through-hole extends to the second branch 332. One end of conductor 351 is located in the first through-hole for coupling with the first branch 331, and the other end of conductor 351 is located in the second through-hole for coupling with the second branch 332, facilitating the connection between the conductor and the first and second branches.

[0090] It is understood that there is a first distance (shortest distance) between the first feed point m and the coupling position of the first branch 331 and conductor 351, and a second distance (shortest distance) between the second feed point n and the coupling position of the second branch 332 and conductor 351. The embodiments of this application do not limit the first distance and the second distance. The first distance and the second distance can be reasonably set according to the capacitance value of the capacitor structure 340, the inductance value of the inductor structure 350, and the communication frequency to suppress the generation of noise resonance with a resonant frequency lower than the communication frequency band.

[0091] In some embodiments, the capacitor structure 340 includes a first electrode 341 and a second electrode 342, which are spaced apart. A radiator 330 near the feed point serves as the second electrode 342, and the first electrode 341 is configured to receive radio frequency signals. This configuration, using the first stub 331 near the feed point as the second electrode 342 of the capacitor structure 340, simplifies the structure of the antenna structure 30 and facilitates miniaturization of the antenna structure 30.

[0092] In the implementation where the first branch 331 and the second branch 332 include a metal layer attached to the dielectric substrate 360, the first pole plate 341 can also be attached to the dielectric substrate 360. One end of the first pole plate 341 is spaced apart from the first branch 331 near the feed point. The first pole plate 341 can be located between the first branch 331 and the second branch 332. This arrangement can further improve the compactness of the antenna structure 30, so as to realize the miniaturization of the antenna structure 30.

[0093] Continue to refer to Figure 5 and Figure 6 In some embodiments, a plurality of first protrusions 343 and a plurality of first recesses 344 are alternately arranged on the first electrode plate 341, and a plurality of second protrusions 345 and a plurality of second recesses 346 are alternately arranged on the second electrode plate 342. Each first protrusion 343 is embedded in a second recess 346, and each second protrusion 345 is embedded in a first recess 344. The first protrusions 343 and second recesses 346 are spaced apart, and the second protrusions 345 and first recesses 344 are spaced apart. This arrangement can increase the effective area of ​​the first electrode plate 341 and the second electrode plate 342, allowing a capacitor structure 340 with a larger capacitance value to be fabricated in a smaller area.

[0094] The embodiments of this application do not limit the shape of the first protrusion 343 and the second protrusion 345. For example, the first protrusion 343 and the second protrusion 345 can both be plate-shaped, and the projections of the first protrusion 343 and the second protrusion 345 on the dielectric substrate 360 ​​can both be rectangular. Correspondingly, the projections of the first recess 344 and the second recess 346 on the dielectric substrate 360 ​​can both be rectangular. Of course, the projections of the first protrusion 343 and the second protrusion 345 on the dielectric substrate 360 ​​can also be triangular or other regular shapes or other irregular shapes. Correspondingly, the first recess 344 and the second recess 346 are respectively adapted to the second protrusion 345 and the first protrusion to ensure that the first protrusion and the second recess 346 are spaced apart, and the second protrusion 345 and the first recess 344 are spaced apart.

[0095] In related technologies, such as Figure 8As shown, antenna structure 30 is a dipole antenna. The first stub 331 has a first feed point m, and the second stub 332 has a second feed point n. The first feed point m and the second feed point n are fed in a feedback symmetrical feeding manner. The communication frequency band of this antenna structure 30 is the 2.4GHz band, which is the WiFi band. Figure 9 for Figure 8 The diagram shows the S-curve of the antenna structure. Curve L1 in the diagram represents the return loss curve of antenna structure 30, and curve L2 represents the antenna efficiency curve of antenna structure 30. Figure 9 It can be seen that three resonances occur on the low-frequency side of the communication band, namely the first resonance, the second resonance, and the third resonance. The resonant frequency of the first resonance is about 0.5 GHz (e.g., A (0.456, -1.8447)), the resonant frequency of the second resonance is about 1.2 GHz (e.g., B (1.48, -0.37402)), and the resonant frequency of the third resonance is about 1.8 GHz. The fourth harmonic of the resonant frequency of the first resonance is likely to fall into the communication band, so the first resonance is a noise resonance. The antenna efficiency of the first resonance is about -4.8 dB, which shows that this noise resonance has a significant impact on communication performance.

[0096] Figure 10 for Figure 5 The simulated return loss curve of the antenna structure shown is presented. Figure 11 for Figure 5 Please refer to the simulated antenna efficiency curve of the antenna structure shown. Figure 10 and Figure 11 The resonant frequency of antenna structure 30 is approximately 2.44 GHz (e.g., C(2.4425, -10.888)), and the antenna efficiency is approximately -0.958 dB (e.g., F(2.44, -0.958)). Compared with related technology one, noise resonance at around 0.5 GHz is eliminated, and noise resonance at around 1.2 GHz becomes insignificant. In other words, almost no resonance occurs on the low-frequency side of the resonant frequency. It can be seen that the generation of noise resonance below the communication frequency band can be suppressed by capacitor structure 340 and inductor structure 350. At 1.2 GHz, the antenna efficiency is approximately -30.393 dB (e.g., D(1.2, -30.393)), and at 1.3 GHz, the antenna efficiency is approximately -26.315 dB (e.g., E(1.3, -26.315)). It can be seen that the antenna efficiency is low near half the harmonic of the resonant frequency, and even lower at the low-frequency side of half the harmonic of the resonant frequency. The suppression of frequencies below 1.2 GHz can reach 30 dB.

[0097] Figure 12 for Figure 5 The measured antenna efficiency diagram of the antenna structure shown is derived from... Figure 12It can be seen that the antenna efficiency is approximately -31.893 dB near 1.2 GHz (e.g., G(1.2, -31.893)), approximately -1.5911 dB near 2.4 GHz (e.g., H(2.4, -1.5911)), and approximately -1.3207 dB near 2.48 GHz (e.g., I(2.48, -1.3207)). This shows that the antenna efficiency is relatively high within the communication frequency band, while it is relatively low near 1.2 GHz, which can further reduce the impact of noise resonance.

[0098] Please refer to Figure 13 and Figure 14 In other embodiments, the antenna structure 30 includes a dielectric substrate 360, and the radiator includes a first branch 331 and a second branch 332. The first branch 331 is disposed on a first surface 361 of the dielectric substrate 360, and the second branch 332 is disposed on a second surface 362 of the dielectric substrate 360. The first surface 361 and the second surface 362 are disposed opposite to each other. This arrangement, with the first branch 331 and the second branch 332 disposed on different surfaces of the dielectric substrate 360, reduces the volume of the radiator, thereby reducing the volume of the antenna structure 30 and facilitating the miniaturization of communication equipment.

[0099] In the above implementation, the inductor structure 350 includes a conductor 351, which passes through the dielectric substrate 360. One end of the conductor 351 is coupled to the first stub 331, and the other end is coupled to the second stub 332. It is understood that since the first stub 331 and the second stub 332 are located on different surfaces of the dielectric substrate 360, a through-hole can be provided at the overlapping position of the projections of the first stub 331 and the second stub 332 onto the dielectric substrate 360. The corresponding conductor 351 can be disposed within this through-hole, with one end coupled to the first stub 331 and the other end coupled to the second stub 332. Through this arrangement, the conductor 351 passes through the dielectric substrate 360, further improving the structural compactness of the antenna structure 30 and facilitating its miniaturization.

[0100] In some implementations, the first branch 331 includes a first arcuate portion 335, a second arcuate portion 336, and a first connecting portion 337. Both the first arcuate portion 335 and the second arcuate portion 336 are arc-shaped, and their center lines are collinear. For example, the inner and outer diameters of the first arcuate portion 335 and the second arcuate portion 336 can be approximately the same, and their corresponding central angles are also approximately the same. The first connecting portion 337 is located between the first arcuate portion 335 and the second arcuate portion 336, and is coupled to both. The first feed point m is located on the first connecting portion 337. This configuration reduces the space occupied by the first branch 331, facilitating miniaturization.

[0101] Similarly, the second branch 332 includes a third arcuate portion 338, a fourth arcuate portion 347, and a second connecting portion 339. Both the third arcuate portion 338 and the fourth arcuate portion 347 are arcuate, and their center lines are collinear. For example, the inner and outer diameters of the third arcuate portion 338 and the fourth arcuate portion 347 can be approximately the same, and their corresponding central angles are also approximately the same. The second connecting portion 339 is located between the third arcuate portion 338 and the fourth arcuate portion 347, and is coupled to both. The second feed point n is located on the second connecting portion 339. This configuration reduces the space occupied by the arcuate third arcuate portion 338 and the fourth arcuate portion 347, facilitating miniaturization.

[0102] In the above implementation, the center lines of the first arc-shaped portion 335 and the third arc-shaped portion 338 are collinear, and the projections of the first arc-shaped portion 335, the second arc-shaped portion 336, the third arc-shaped portion 338, and the fourth arc-shaped portion 347 onto the dielectric substrate 360 ​​are spaced apart around the center line of the first arc-shaped portion 335. In some examples, the first arc-shaped portion 335, the second arc-shaped portion 336, the third arc-shaped portion 338, and the fourth arc-shaped portion 347 can be arranged approximately centrally symmetrically, so that the radiator 330 has a roughly loop-shaped current and the antenna structure 30 is a magnetic dipole antenna, which can improve the stability of signal transmission.

[0103] Please refer to Figure 14 and Figure 15 , Figure 15 for Figure 14In the enlarged view at point B, in some embodiments, the capacitor structure 340 includes a first electrode 341 and a second electrode 342, spaced apart. A radiator 330 near the feed point serves as the second electrode 342, and the first electrode 341 is configured to receive radio frequency signals. This configuration, using the radiator 330 near the feed point as the second electrode 342 of the capacitor structure 340, simplifies the structure of the antenna structure 30 and facilitates its miniaturization.

[0104] In different implementations where the first branch 331 and the second branch 332 are respectively disposed on different surfaces of the dielectric substrate 360, the first electrode plate 341 can be attached to the dielectric substrate 360, and a mounting hole can be provided at the feed point of the first branch 331. The first electrode plate 341 can be disposed within the mounting hole, with a gap between the first electrode plate 341 and the mounting hole to form an equivalent capacitance. This configuration can further improve the compactness of the antenna structure 30, facilitating the miniaturization of the antenna structure 30.

[0105] In some examples, the first connecting portion 337 is arranged radially, and the first feed point m can be located at the center line of the first arcuate portion 335 and the second arcuate portion 336. Correspondingly, a mounting hole is provided on the first connecting portion 337, and the center line of the mounting hole coincides with the center line of the first arcuate portion 335. Accordingly, the first electrode plate 341 can be approximately circular to ensure that the minimum distance between the edge of the first electrode plate 341 and the wall of the mounting hole is approximately the same at all points.

[0106] In some embodiments, a plurality of first protrusions 343 and a plurality of first recesses 344 are alternately arranged on the first electrode plate 341, and a plurality of second protrusions 345 and a plurality of second recesses 346 are alternately arranged on the second electrode plate 342. Each first protrusion 343 is embedded in a second recess 346, and each second protrusion 345 is embedded in a first recess 344. The first protrusions 343 and second recesses 346 are spaced apart, and the second protrusions 345 and first recesses 344 are spaced apart. This arrangement can increase the effective area of ​​the first electrode plate 341 and the second electrode plate 342, allowing a capacitor structure 340 with a larger capacitance value to be fabricated in a smaller area.

[0107] In the implementation where the first electrode plate 341 is circular and is disposed within the mounting hole on the first connecting portion 337, a plurality of first protrusions 343 and a plurality of first recesses 344 are alternately arranged around the center line of the first electrode plate 341; correspondingly, a plurality of second protrusions 345 and a plurality of second recesses 346 are alternately arranged around the center line of the mounting hole at the hole wall.

[0108] The embodiments of this application do not limit the shape of the first protrusion 343 and the second protrusion 345. For example, the first protrusion 343 and the second protrusion 345 can both be plate-shaped, and the projections of the first protrusion 343 and the second protrusion 345 on the dielectric substrate 360 ​​can both be rectangular. Correspondingly, the projections of the first recess 344 and the second recess 346 on the dielectric substrate 360 ​​can both be rectangular. Of course, the projections of the first protrusion 343 and the second protrusion 345 on the dielectric substrate 360 ​​can also be triangular or other regular shapes or other irregular shapes. Correspondingly, the first recess 344 and the second recess 346 are respectively adapted to the second protrusion 345 and the first protrusion to ensure that the first protrusion and the second recess 346 are spaced apart, and the second protrusion 345 and the first recess 344 are spaced apart.

[0109] In related technologies, such as Figure 16 and Figure 17 As shown, antenna structure 30 is a dipole antenna. The first stub 331 and the second stub 332 are respectively disposed on different surfaces of the dielectric layer. The first stub 331 has a first feed point m, and the second stub 332 has a second feed point n. The first feed point m and the second feed point n are fed in a feedback symmetrical feeding manner. The communication frequency band of this antenna structure 30 is the 2.4GHz band, which is the WiFi band. Figure 18 for Figure 16 and Figure 17 The S-curve diagram of the antenna structure shown. Figure 18 Curve L3 represents the return loss curve of antenna structure 30. Figure 18 L4 represents the antenna efficiency curve of antenna structure 30, derived from... Figure 18 It can be seen that two resonances occur on the low-frequency side of the communication band, namely the first resonance and the second resonance. The resonant frequency of the first resonance is about 0.5 GHz (e.g., A (0.456, -1.0689) and C (0.46195, -7.3766), and the resonant frequency of the second resonance is about 1.2 GHz (e.g., B (1.5353, -3.4196) and D (1.3, -10.008)). The fourth harmonic of the resonant frequency of the first resonance and the second harmonic of the second resonance are likely to fall within the communication band. Therefore, there is a certain antenna efficiency near the first resonance and the second resonance. It can be seen that these two noise resonances have a significant impact on communication performance.

[0110] Figure 19 for Figure 13 and Figure 14 The simulated return loss curve of the antenna structure shown is presented. Figure 20 for Figure 13 and Figure 14 Please refer to the simulated antenna efficiency curve of the antenna structure shown. Figure 19 and Figure 20The resonant frequency of antenna structure 30 is approximately 2.44 GHz (e.g., F(2.4439, -32.491)), and the antenna efficiency is approximately -0.86494 dB (e.g., I(2.44, -0.86494)). Compared with related technology one, noise resonance around 0.4 GHz is eliminated, and the efficiency around 0.4 GHz is relatively low (e.g., H(0.6, -48.551)). It can be seen that the capacitor structure 340 and the inductor structure 350 can suppress noise resonance below the communication frequency band. Although noise resonance around 1.2 GHz still exists, its efficiency is low (e.g., G(1.2, -38.19)) and will not affect communication.

[0111] Figure 21 for Figure 13 and Figure 14 The measured antenna efficiency diagram of the antenna structure shown is derived from... Figure 21 It can be seen that the antenna efficiency is approximately -29.222 dB near 1.2 GHz (e.g., J(1.2, -29.222)), while the antenna efficiency is relatively high near 2.4 GHz (e.g., K(2.4, -2.1645) and L(2.48, -2.473)). This indicates that the antenna efficiency is relatively high within the communication frequency band, while it is relatively low near 1.2 GHz, which can further reduce the impact of noise resonance.

[0112] The above description is merely a specific implementation of the embodiments of this application, but the protection scope of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the protection scope of this application. Therefore, the protection scope of this application should be determined by the protection scope of the claims.

Claims

1. An antenna structure, characterized in that, include: A radiator having a feed point provided on it; A capacitor structure, one end of which is coupled to the feed point, and the other end of which is configured to receive radio frequency signals; An inductor structure, one end of which is coupled to the radiator, and the other end of which is configured to be grounded; The capacitor structure and the inductor structure are used to suppress resonance in communication bands with resonant frequencies lower than those of the antenna structure.

2. The antenna structure according to claim 1, characterized in that, The radiator includes a first branch and a second branch, and the feed point includes a first feed point and a second feed point. The first feed point is located on the first branch, and the second feed point is located on the second branch. One end of the capacitor structure is coupled to the first feed point, and the other end of the capacitor structure and the second feed point are configured to be fed in an antisymmetric manner. One end of the inductor structure is coupled to the first stub, and the other end of the inductor structure is coupled to the second stub.

3. The antenna structure according to claim 2, characterized in that, The antenna structure includes a dielectric substrate, and the first stub and the second stub are both disposed on the first surface of the dielectric substrate.

4. The antenna structure according to claim 3, characterized in that, The inductor structure includes a conductor disposed on a second surface of the dielectric substrate, one end of the conductor being coupled to the first stub and the other end of the conductor being coupled to the second stub; the first surface and the second surface are disposed opposite to each other.

5. The antenna structure according to claim 4, characterized in that, One end of the conductor passes through the dielectric plate and is coupled to the first stub, and the other end of the conductor passes through the dielectric plate and is coupled to the second stub.

6. The antenna structure according to claim 2, characterized in that, The antenna structure includes a dielectric substrate, with the first branch disposed on a first surface of the dielectric substrate and the second branch disposed on a second surface of the dielectric substrate, the first surface and the second surface being disposed opposite to each other.

7. The antenna structure according to claim 6, characterized in that, The inductor structure includes a conductor that passes through the dielectric substrate, with one end of the conductor coupled to the first stub and the other end of the conductor coupled to the second stub.

8. The antenna structure according to claim 6 or 7, characterized in that, The first branch includes a first arc-shaped portion, a second arc-shaped portion, and a first connecting portion. Both the first arc-shaped portion and the second arc-shaped portion are arc-shaped, and their center lines are collinear. The first connecting portion is located between the first arc-shaped portion and the second arc-shaped portion, and is coupled to both the first arc-shaped portion and the second arc-shaped portion. The first power supply point is located on the first connecting portion.

9. The antenna structure according to claim 8, characterized in that, The second branch includes a third arc-shaped portion, a fourth arc-shaped portion, and a second connecting portion. The third arc-shaped portion and the fourth arc-shaped portion are both arc-shaped, and their center lines are collinear. The second connecting portion is located between the third arc-shaped portion and the fourth arc-shaped portion, and is coupled to both the third arc-shaped portion and the fourth arc-shaped portion. The second feed point is located on the second connecting portion. The center lines of the first arc-shaped portion and the third arc-shaped portion are collinear, and the projections of the first arc-shaped portion, the second arc-shaped portion, the third arc-shaped portion, and the fourth arc-shaped portion on the medium plate are spaced around the center line of the first arc-shaped portion.

10. The antenna structure according to any one of claims 1-9, characterized in that, The capacitor structure includes a first plate and a second plate, which are spaced apart. The radiator near the feed point serves as the second plate, and the first plate is configured to receive radio frequency signals.

11. The antenna structure according to claim 10, characterized in that, The first electrode plate is alternately provided with a plurality of first protrusions and a plurality of first recesses, and the second electrode plate is alternately provided with a plurality of second protrusions and a plurality of second recesses, each of the first protrusions being embedded in a second recess and each of the second protrusions being embedded in a first recess.

12. The antenna structure according to any one of claims 1-11, characterized in that, The communication frequency band of the antenna structure includes the WIFI frequency band.

13. A communication device, characterized in that, It includes: a radio frequency device and an antenna structure according to any one of claims 1-12, wherein the radio frequency device is coupled to the capacitor structure.

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