Antenna and electronic device

Abstract

The application provides an antenna and an electronic device. The antenna comprises: a first radiator having a first end, a second end and a feed point, the second end being a free end; a second radiator having a third end and a fourth end, the third end and the fourth end being both ground ends and the third end being spaced apart from the first end to form a first gap; a feed source electrically connected with the feed point, the feed source exciting the first radiator to resonate at a first frequency, and the first end electrically coupling the excitation current of the feed source to the second radiator through a first gap electric field to excite the second radiator to resonate at a second frequency, the first frequency and the second frequency being frequencies belonging to a low frequency LB frequency band and different from each other. The antenna can improve the radiation efficiency of low frequency signals in the case of limited occupied space, thereby improving the communication performance.

Description

Technical Field

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

[0002] With the continuous development of communication technology, it is necessary to deploy multiple antennas in electronic devices such as mobile phones. These multiple antennas include, for example, navigation antennas, low-frequency antennas, and mid-to-high-frequency antennas. Among them, low-frequency (LB) antennas are relatively large in size, and their performance is a key factor affecting communication performance.

[0003] Due to the miniaturization of electronic devices and the need to install multiple antennas within the limited space of electronic devices, the communication performance of low-frequency antennas deployed in related technologies is limited and needs to be further improved. Summary of the Invention

[0004] This application provides an antenna and an electronic device. The various aspects related to the embodiments of this application are described below.

[0005] In a first aspect, an antenna is provided, the antenna comprising: a first radiator having a first end, a second end, and a feed point, the second end being a free end; a second radiator having a third end and a fourth end, the third end and the fourth end being grounded ends and the third end being spaced apart from the first end to form a first gap; a feed source electrically connected to the feed point, the feed source exciting the first radiator to resonate at a first frequency, the first end coupling the excitation current of the feed source to the second radiator through the magnetic field of the first gap to exciting the second radiator to resonate at a second frequency, the first frequency and the second frequency being frequencies belonging to the low-frequency LB band and different from each other.

[0006] In a second aspect, an electronic device is provided, the electronic device comprising an antenna as described in the first aspect.

[0007] This application provides an antenna comprising: a first radiator having a first end, a second end, and a feed point, the second end being a free end; a second radiator having a third end and a fourth end, both the third and fourth ends being grounded ends, and the third end being spaced apart from the first end to form a first gap; and a feed source electrically connected to the feed point, the feed source exciting the first radiator to resonate at a first frequency, the first end coupling the excitation current of the feed source to the second radiator through the first gap magnetic field to exciting the second radiator to resonate at a second frequency, the first frequency and the second frequency being frequencies belonging to the low-frequency LB band and different from each other. This antenna utilizes a ring parasitic radiator with the second radiator as a low-frequency antenna, which can simultaneously excite the first radiator to generate a resonant current at the first frequency and the second radiator to generate a resonant current at the second frequency. Since both the first and second frequencies are low-frequency frequencies, a superposition of low-frequency frequencies can be formed, thereby improving the radiation efficiency of low-frequency signals within a limited space, thus improving communication performance. Attached Figure Description

[0008] Figure 1 This is a schematic diagram of the structure of an antenna provided in one embodiment of this application.

[0009] Figure 2(a) is Figure 1 A schematic diagram of one resonant mode of an antenna.

[0010] Figure 2(b) is Figure 1 A schematic diagram of another resonance mode of the antenna in the image.

[0011] Figure 2(c) is Figure 1 A schematic diagram of another resonance mode of the antenna in the image.

[0012] Figure 2(d) is Figure 1 A schematic diagram of another resonance mode of the antenna in the image.

[0013] Figure 3 This is a schematic diagram of the antenna structure provided in another embodiment of this application.

[0014] Figure 4(a) is Figure 3 A schematic diagram of one resonant mode of an antenna.

[0015] Figure 4(b) is Figure 3 A schematic diagram of another resonance mode of the antenna in the image.

[0016] Figure 5 yes Figure 1 Simulation diagrams of the antenna's S-parameters, system radiation efficiency, and overall system efficiency.

[0017] Figure 6 yes Figure 3 Simulation diagrams of the antenna's S-parameters, system radiation efficiency, and overall system efficiency.

[0018] Figure 7 This is a schematic diagram of the antenna structure provided in another embodiment of this application.

[0019] Figure 8(a) is Figure 7 A schematic diagram of one resonant mode of an antenna.

[0020] Figure 8(b) is Figure 7 A schematic diagram of another resonance mode of the antenna in the image.

[0021] Figure 8(c) is Figure 7 A schematic diagram of another resonance mode of the antenna in the image.

[0022] Figure 9 yes Figure 7 Simulation diagrams of the antenna's S-parameters, system radiation efficiency, and overall system efficiency.

[0023] Figure 10 This is a simulation diagram of the S-parameters of the relevant antenna provided in the embodiments of this application.

[0024] Figure 11 The simulation diagrams of the radiation efficiency and overall system efficiency of the antenna system provided in the embodiments of this application are shown.

[0025] Figure 12 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application.

[0026] Figure 13 This is a schematic diagram of the structure of an electronic device provided in another embodiment of this application.

[0027] Figure 14 This is a schematic diagram of the structure of an electronic device provided in another embodiment of this application.

[0028] Figure 15 This is a schematic diagram of the structure of an electronic device provided in another embodiment of this application.

[0029] Figure 16 This is a schematic diagram of the matching path in a matching circuit provided in an embodiment of this application. Detailed Implementation

[0030] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0031] With the development of electronic technology, electronic devices (such as smartphones and tablets) are becoming increasingly prevalent in people's daily lives, and their communication functions are becoming more and more powerful. For example, electronic devices need to have near-field communication, navigation, and far-field communication capabilities. Different communication functions correspond to different communication frequency bands, and even within the same communication function, multiple communication frequency bands can be subdivided.

[0032] For example, the communication frequency bands for near-field communication (NFC) functions can include Bluetooth, Wi-Fi, and NFC communication bands. Wi-Fi bands can include the 2.4GHz and 5GHz Wi-Fi bands. Navigation functions can include the GPS-L1 and GPS-L5 bands. Far-field communication (FHF) bands include low-frequency (LB), middle-high-frequency (MHB), and ultra-high-frequency (UHB) bands. Specifically, FHF bands can include various bands and combinations of NR and LTE bands to meet the wireless communication needs of electronic devices under 2G, 3G, 4G, 5G, and even 6G broadband. The UHB band can include the N78 and N77 bands.

[0033] Therefore, electronic devices require multiple antennas to fulfill various communication functions. Among these, low-frequency antennas are used to transmit and receive low-frequency signals. Low-frequency signals can refer to those used for 4G and / or 5G communication. The frequency band f1 of low-frequency signals is typically less than 1 GHz. The performance of low-frequency antennas is a key factor affecting communication performance, and these antennas are relatively large. However, due to the large number of antennas within electronic devices and the limited space inside, how to effectively install low-frequency antennas within this limited space has become a pressing technical problem.

[0034] As a feasible approach, such as Figure 1 As shown, the low-frequency antenna 100 in the electronic device 10 can be configured to include a first radiator 110, a second radiator 120, a third radiator 130, and a feed ANT1.

[0035] The first radiator 110 can be configured as a T-type antenna. The first radiator 110 includes a first sub-stub 111 and a second sub-stub 112 and a third sub-stub 113 extending outward from one end a of the first sub-stub 111 and separated from each other.

[0036] The first sub-stub 111 has a first free end 114, a first ground end 115, and a feed point 116. The feed point 116 is located near one end a and is connected to the feed source ANT1. Optionally, the feed point 116 is electrically connected to the feed source ANT1 through a first matching circuit M1. The first radiator 110 can be the main radiator of the low-frequency antenna 100. The first ground end 115 is located between the first free end 114 and the feed point 116. The first ground end 115 is grounded to GND2. Optionally, the first ground end 115 can be grounded to GND2 through a second matching circuit M2. The second sub-stub 112 includes a second ground end 117, which is located at the end of the second sub-stub 112 and is grounded to GND1. The third sub-stub 113 includes a second free end A, which is located at the end of the third sub-stub 113.

[0037] The second radiator 120 includes a third free end 121 and a third ground end 122. The third ground end 122 is grounded to GND3 and is spaced apart from the first free end 114 to form a first gap 123. The second radiator 120 can become a parasitic radiator of the main radiator described above through the first gap 123. Optionally, the third ground end 122 can be grounded to GND3 through a third matching circuit M3.

[0038] The third radiator 130 includes a fourth ground terminal 131 and a fifth ground terminal 132, with the fourth ground terminal 131 and the third free terminal 121 spaced apart to form a second gap 133. The fourth ground terminal 131 and the fifth ground terminal 132 are grounded to GND4 and GND5, respectively. Optionally, the fourth ground terminal 131 can be grounded to GND4 through a fourth matching circuit M4. The third radiator 130 can become a parasitic radiator at the distal end of the main radiator described above, through the second gap 133, the second radiator 120, and the first gap 123.

[0039] Feed ANT1 is connected to feed point 116, and the excitation current of feed ANT1 can support excitation of four resonant modes. Among them, such as... Figure 2a As shown, the first resonant mode is a quarter-wavelength mode with the excitation current flowing from GND1 to the first slot 123, accompanied by a strong reverse current flowing from the second slot 133 to GND3. The first resonant mode can also be called the EH mode. This first resonant mode is used to support the transmission and reception of signals at the first frequency. Figure 2b As shown, the second resonant mode is the dominant mode in the LB band, and it is a quarter-wavelength mode where the excitation current flows from GND1 to the first slot 123. The second resonant mode is used to support the transmission and reception of signals at the second frequency. Figure 2c As shown, the third resonant mode is a ring mode, from GND5 to GND4. Figure 2dAs shown, the fourth resonant mode is the half-wavelength mode from the second free end A to the first free end 114.

[0040] Since both the first and second resonant modes require resonance between the quarter-wavelength modes from GND1 to the first slot 123, only the first frequency signal supported by the first resonant mode or the second frequency signal supported by the second resonant mode can exist simultaneously. Furthermore, because a second radiator exists between the third radiator and the feed, the generation of the third resonant mode essentially requires the assistance of the second radiator to couple the resonant current of the feed to the third radiator. Therefore, the third frequency signal supported by the third resonant mode cannot coexist with either the first or second frequency signal. In view of this, the low-frequency antenna in this implementation can only achieve single-wave transmission; therefore, the radiation efficiency of the low-frequency antenna in this implementation is limited, and the communication quality needs further improvement.

[0041] To further improve the radiation efficiency of low-frequency antennas, this application proposes a new structure for low-frequency antennas. The following describes the structure in conjunction with... Figure 3 The antenna 300 provided in the embodiments of this application will be described in detail. It should be understood that the antenna 300 can be disposed in the electronic device 30 described below.

[0042] like Figure 3 As shown, antenna 300 may include a first radiator 310, a second radiator 320, and a feed ANT1'.

[0043] The first radiator 310 is the main radiator of the low-frequency antenna, directly electrically connected to the feed source ANT1'. This application embodiment does not specifically limit the structural form of the first radiator 310, as long as the first radiator 310 transmits and receives signals at a first frequency under the excitation of the feed source ANT1' and has a first end 311, a second end 312, and a feed point 313. The first end 311 and the second end 312 together form the two ends of the first radiator 310, and the second end 312 is a free end. The feed point 313 is used for electrical connection with the feed source ANT1'. This application embodiment does not specifically limit the position of the feed point 313, as long as the feed point 313 is located on the first radiator 310.

[0044] In one implementation, the first radiator 310 can be a radiator forming a monopole antenna. A monopole antenna can be understood as an antenna that does not have a direct ground terminal on the radiator, but can be grounded through a connected feed source. Based on this, the feed point 313 can be located at the first end 311, that is, the first end 311 is the feed point 313.

[0045] As an alternative implementation, the first radiator 310 can be a radiator forming an inverted-F-antenna (IFA) or a composite right-and-left-handed (CRLH) antenna. Based on this, the feed point 313 can be located between the first end 311 and the second end 312. The first end 311 can be a grounded end and grounded to GND0. A detailed description can be found later.

[0046] In this embodiment, the first end 311 of the first radiator 310 can form a strong magnetic field region (H region) under the excitation of the feed source ANT1', and the second end 312 can form a strong electric field region (E region) under the excitation of the feed source ANT1'. The strong magnetic field region can also be called a strong magnetic field region or a strong current region. In the strong magnetic field region, the magnetic field generated by the first radiator 310 is greater than the electric field generated by the first radiator 310. The strong electric field region can also be called a strong electric field region. In the strong electric field region, the electric field generated by the first radiator 310 is greater than the magnetic field generated by the first radiator 310.

[0047] Optionally, a first matching circuit M1' may be provided between the feed source ANT1' and the feed point 313. The first matching circuit M1' can be used to filter out noise in the excitation signal transmitted by the feed source ANT1', and can also be used to perform impedance matching on the excitation signal transmitted by the feed source ANT1' to excite the first radiator to resonate at a first frequency. The first matching circuit M1' can also be used to switch the magnitude of the first frequency.

[0048] The second radiator 320 has a third end 321 and a fourth end 322, which together form the two ends of the second radiator 320. Both the third end 321 and the fourth end 322 are grounded ends. Therefore, the second radiator 320 can be understood as a ring radiator. The third end 321 and the fourth end 322 can be grounded to GND2 and GND1, respectively.

[0049] The third end 321 is spaced apart from the first end 311 to form a first gap 323. The first gap 323 makes the second radiator 320 a parasitic radiator of the first radiator 310. Since the first gap 323 is close to the strong magnetic field region (H region) of the first radiator 310, the presence of the first gap 323 can realize magnetic field coupling between the first radiator 310 and the second radiator, and the second radiator 320 forms an H-ring parasitic radiator of the first radiator.

[0050] The size of the first gap 323 is not specifically limited in this embodiment, as long as the first gap 323 can couple the excitation signal magnetic field of the feed source ANT1' to the second radiator 320.

[0051] The feed source ANT1' is electrically connected to the feed point 313. The excitation signal generated by the feed source ANT1' can excite the first radiator 310 to resonate at a first frequency, thereby supporting the transmission and reception of signals at the first frequency. Due to the presence of the first gap 323, while the first radiator 310 is excited by the excitation signal generated by the feed source ANT1', its first end 311 can couple the excitation current of the feed source ANT1' to the second radiator 320 through the magnetic field of the first gap 323, thereby exciting the second radiator 320 to resonate at a second frequency, thereby supporting the transmission and reception of signals at the second frequency. In this embodiment, both the first frequency and the second frequency belong to the low-frequency (LB) band, and the first frequency and the second frequency are different.

[0052] Optionally, a second matching circuit M2' may be provided between the third terminal 321 and ground GND2. The second matching circuit M2' can be used to filter out noise in the excitation signal and can also be used to perform impedance matching on the excitation signal to excite the second radiator to resonate at the second frequency.

[0053] In some embodiments, the second matching circuit M2' may include different capacitors or an adjustable capacitor. In this case, the second radiator 320 is inductive under the excitation signal of the feed source. That is, the second radiator 320 is equivalent to an inductor L under the excitation of the feed source. The inductor L, together with the capacitor C in M2', can form an LC resonance, that is, form a first resonant circuit. Therefore, by adjusting the size of the capacitor C in the second matching circuit M2', the size of the second frequency can be adjusted.

[0054] It should be understood that the magnetic field coupling described in this application embodiment can be understood as coupling the excitation current on the first radiator 310 to the second radiator 320 through a strong magnetic field region (H region) on the first radiator 310. The strong magnetic field region is typically the area near the feed source ANT1'. Figure 3 In the antenna 100 shown, the first end 311 is the strong magnetic field region.

[0055] In this embodiment, the excitation current of the feed ANT1' supports the excitation of a first resonant mode and a second resonant mode. The first resonant mode supports the transmission and reception of the first frequency signal, and the second resonant mode supports the transmission and reception of the second frequency signal. For ease of understanding, the resonant modes supported by the feed ANT1' are described in detail below with reference to Figure 4.

[0056] like Figure 4a As shown, the first resonant mode is a quarter-wavelength mode where the excitation current flows from the second terminal 312 to the feed source ANT1'. Figure 4bAs shown, the second resonant mode is the first ring mode where the excitation current flows from the ground GND1 connected to the fourth terminal to the ground GND2 connected to the third terminal. The first ring mode can also be called the H-ring mode.

[0057] The antenna provided in this application embodiment supports a first frequency signal and a second frequency signal, which can be generated by a first radiator and a second radiator, respectively. Since the second radiator 320 is a ring parasitic radiator of the first radiator, the feed ANT1' connected to the first radiator 310 can simultaneously excite the first radiator to resonate at the first frequency and the second radiator to resonate at the second frequency. This allows two waves to work simultaneously and the first and second frequencies to form a low-frequency superposition, improving the radiation efficiency in the main band. At the same time, since the antenna structure is simple, the radiation efficiency of low-frequency signals can be improved with limited space, thus improving communication performance.

[0058] To verify the radiation efficiency of the antenna in the embodiments of this application, Figure 5 Given Figure 1 Simulation diagrams of the system radiation efficiency, overall system efficiency, and S-parameters of the antenna in the diagram. Figure 6 Given Figure 3 Simulation diagrams of the system radiation efficiency, overall system efficiency, and S-parameters of the antenna in the diagram.

[0059] like Figure 5 As shown, the frequency points generated by the feed ANT1 in antenna 100 include frequency point a. Frequency points a and a correspond one-to-one with the first to fourth resonant modes of antenna 100 in Figure 2. Specifically, frequency point a has a frequency of 0.65 GHz, a return loss of less than -20 dB, and a total system efficiency of -10 dB. Frequency point b (the resonant frequency corresponding to the dominant mode) has a frequency of 0.75 GHz, a return loss of -5.2 dB, and a total system efficiency of -4 dB. Frequency point c has a frequency of 0.88 GHz, a return loss of -6 dB, and a total system efficiency of -6 dB. Frequency point d has a frequency of 1.25 GHz, a return loss of less than -5.8 dB, and a total system efficiency of -5.8 dB.

[0060] like Figure 6 As shown, the frequency points generated by the feed ANT1' in antenna 300 include frequency points AB. Frequency points AB correspond one-to-one with the first and second resonant modes of antenna 300 in Figure 4. Specifically, frequency point A (the resonant frequency corresponding to the dominant mode) has a frequency of 0.737 GHz, a return loss of -8.0458 dB, and a total system efficiency of -5 dB. Frequency point B has a frequency of 0.6605 GHz, a return loss of -26.473 dB, and a total system efficiency of -7.5 dB.

[0061] Depend on Figure 5 and Figure 6 It is understood that the system efficiency of the antenna 300 provided in this application embodiment is not much different from that of the antenna 100 at the resonant frequency corresponding to the main mode. However, the first frequency and the second frequency of the antenna 300 in this application embodiment can coexist at the same time, so dual-wave slicing and dual-wave simultaneous operation can be realized.

[0062] In some embodiments, such as Figure 7 As shown, to further improve the radiation efficiency of low-frequency signals, the antenna 300 may further include a third radiator 330. The third radiator 330 has a fifth terminal 331 and a sixth terminal 332. Both the fifth terminal 331 and the sixth terminal 332 are grounded terminals, and the fifth terminal 331 and the sixth terminal 332 are grounded to ground GND3 and ground GND4, respectively. The fifth terminal 331 is spaced apart from the second terminal 312 to form a second gap 333.

[0063] The second slit 333 makes the third radiator 330 a parasitic radiator of the first radiator 310. Since the second slit 333 is located near the strong electric field region (E region) at the left end of the first radiator 310, the existence of the second slit can realize the electric field coupling between the first radiator 310 and the third radiator 330, and the third radiator 330 forms an E-ring parasitic radiator of the first radiator.

[0064] In this embodiment, the second terminal 312 couples the excitation current of the feed source ANT1' to the third radiator 330 through the electric field of the second gap 333, thereby exciting the third radiator 330 to resonate at the third frequency to support the transmission and reception of signals at the third frequency. It should be noted that the third frequency is also a frequency belonging to the LB band and is different from the first and second frequencies.

[0065] The embodiments of this application do not specifically limit the size of the second gap 333, as long as the second gap 333 can couple the excitation signal electric field of the feed source ANT1' to the third radiator 330.

[0066] Optionally, a third matching circuit M3' may be provided between the fifth terminal 331 and ground GND3. The third matching circuit M3' can be used to filter out noise in the excitation signal and to perform impedance matching on the excitation signal to excite the third radiator 330 to resonate at the third frequency. In addition, the third matching circuit M3' can also be used to switch the magnitude of the third frequency.

[0067] In some embodiments, the third matching circuit M3' may include different capacitors or an adjustable capacitor. In this case, the third radiator 330 is inductive under the excitation signal of the feed source. That is, the third radiator 330 is equivalent to an inductor L under the excitation of the feed source. The inductor L, together with the capacitor C in M3', can form an LC resonance, that is, form a second resonant circuit. Therefore, by adjusting the size of the capacitor C in the third matching circuit M3', the size of the third frequency can be adjusted.

[0068] In view of this, Figure 7 The excitation current of the feed ANT1' in antenna 300 supports three resonant modes: the first resonant mode, the third resonant mode, and so on. Figure 8a As shown, Figure 7 The first resonant mode supported by the excitation current of the feed ANT1' in the antenna 300 and Figure 4a The resonant modes shown are consistent. For example... Figure 8b As shown, Figure 7 The second resonant mode supported by the excitation current of the feed ANT1' in antenna 300 and Figure 4b The resonant modes shown are consistent. Furthermore, as... Figure 8c As shown, Figure 7 The third resonant mode supported by the excitation current of the feed ANT1' in the antenna 300 is the second ring mode, which is the excitation current flowing from ground GND4 connected to the sixth terminal to ground GND3 connected to the fifth terminal. The second ring mode can also be called the E-ring mode. This third resonant mode is used to support the transmission and reception of signals at the third frequency.

[0069] By setting the third radiator 330 as another adjacent parasitic radiator of the first radiator 310, the antenna 300 can simultaneously generate resonances at the first, second, and third frequencies under the excitation of the same feed source. Therefore, it can achieve simultaneous operation of three waves and simultaneous tangent of three waves. In addition, since the first, second, and third frequencies are all low-frequency band frequencies, they can form a superposition of low-frequency signals, thereby further improving the radiation efficiency in the main band and realizing the widening of the LB.

[0070] In this embodiment, the first frequency is a frequency located in a first frequency band, the second frequency is a frequency located in a second frequency band, and the third frequency is a frequency located in a third frequency band. The first, second, and third frequency bands all belong to the LB band, but are all different. Furthermore, the antenna in this embodiment can be configured to support simultaneous switching of the first, second, and third frequencies within the first, second, and third frequency bands, respectively.

[0071] To further verify the radiation efficiency of the antenna in the embodiments of this application, Figure 9 Given Figure 7 Simulation diagrams of the system radiation efficiency, overall system efficiency, and S-parameters of antenna 300.

[0072] like Figure 9 As shown, the frequency points generated by the feed ANT1' in antenna 300 include frequency point AC. Frequency points AC correspond one-to-one with the first and third resonant modes of antenna 300 in Figure 8. Specifically, frequency point A (the resonant frequency corresponding to the dominant mode) has a frequency of 0.7235 GHz, a return loss of -11.204 dB, and a total system efficiency of -5 dB. Frequency point B has a frequency of 0.6605 GHz, a return loss of -24.524 dB, and a total system efficiency of -7.5 dB. Frequency point C has a frequency of 0.809 GHz, a return loss of -12.559 dB, and a total system efficiency of -5 dB. pass Figure 9 It can be seen that, compared to Figure 6 Antenna 300 in the middle, Figure 9 The antenna 300 in the middle can further excite the frequency point C, and the overall system efficiency at frequency point C is relatively high.

[0073] In addition, to better understand the improvements in S-parameters and radiation efficiency of the antenna 300 provided in this application embodiment, Figure 10 The S-parameters of the antenna are shown in three scenarios: including only the first radiator, including only the first and second radiators, and including the first, second, and third radiators. Figure 10 It can be seen that the antenna including only the first and second radiators has an increased H-ring resonance around 0.67 GHz in its S-parameters compared to the antenna including only the first radiator. Furthermore, the antenna including the first, second, and third radiators has an increased E-ring resonance around 0.82 GHz in its S-parameters compared to the antenna including only the first and second radiators.

[0074] Figure 11 The radiation efficiency of the antenna is shown in three scenarios: including only the first radiator, including only the first and second radiators, and including the first, second, and third radiators. Figure 11 It can be seen that an antenna including only the first and second radiators can improve the overall system efficiency of the main band radiation efficiency compared to an antenna including only the first radiator. Furthermore, an antenna including the first, second, and third radiators can further extend the main band radiation efficiency bandwidth compared to an antenna including only the first and second radiators, achieving wideband (LB) radiation efficiency.

[0075] In the embodiments of this application, the first radiator 310, the second radiator 320, or the third radiator 330 may be formed as a flexible printed circuit (FPC) antenna radiator, a laser direct forming (LDS) antenna radiator, a printed direct forming (PDS) antenna radiator, or a metal frame in any one or more ways.

[0076] This application does not specifically limit the shape of the first radiator 310, the second radiator 320, or the third radiator 330. The shapes of the first radiator 310, the second radiator 320, or the third radiator 330 include, but are not limited to, bent shapes, strips, sheets, rods, coatings, films, etc. When the first radiator 310, the second radiator 320, or the third radiator 330 is strip-shaped, this application does not limit the extension trajectory of the first radiator 310, the second radiator 320, or the third radiator 330, as long as the second radiator 320 and the third radiator 330 are located at opposite ends of the first radiator 310 and are coupled through gaps at both ends. For example, the first radiator 310, the second radiator 320, or the third radiator 330 can extend along a straight line, a curve, or multiple bends. Furthermore, the first radiator 310, the second radiator 320, or the third radiator 330 can be a line of uniform width along its extension trajectory, or a strip of varying width, such as one with a gradually changing width or a widened area.

[0077] As an example, such as Figure 3 as well as Figure 7 As shown, the first radiator 310 may be in the shape of a straight line. The second radiator 320 and / or the third radiator 330 may be in the shape of a zigzag line with a 90-degree bend.

[0078] In this application embodiment, the length of the first radiator 310, the second radiator 320, or the third radiator 330 is not specifically limited, and can be adjusted based on the radiation frequency.

[0079] As one implementation method, such as Figure 12 and Figure 13Therefore, the first radiator 310 can be the radiator of the monopole antenna described above. Based on this, the length of the first radiator 310 can be made relatively small to achieve a miniaturized monopole antenna. In order to ensure the radiation efficiency of the miniaturized monopole antenna, the first end 311 of the first radiator 310 can be set at the corner formed by the bottom edge 31 and the first side edge 32, that is, the first end 311 of the first radiator 310 can be set at the corner of the electronic device 30 to reduce the radiation direction of the ground current when the monopole antenna is grounded, thereby improving the radiation efficiency of the miniaturized monopole antenna.

[0080] As another example, the length of the second radiator 320 is related to the design of the second frequency. The length of the second radiator 320 can be set according to the second frequency; in other words, the value of the second frequency can be adjusted according to the length of the second radiator 320.

[0081] As another example, the length of the third radiator 330 is related to the design of the third frequency. The length of the third radiator 330 can be set according to the third frequency; in other words, the value of the third frequency can be adjusted according to the length of the third radiator 330. As mentioned above, this application does not specifically limit the type of the first radiator 310, which can also be a radiator forming an IFA antenna or a CRLH antenna. For ease of understanding, Figure 14 A schematic diagram of the structure of antenna 300 is shown when the first radiator 310 is a radiator forming an IFA antenna. Figure 15 A schematic diagram of the antenna 300 is shown when the first radiator 310 is a radiator forming a CRLH antenna. Figure 14 and Figure 15 In this configuration, the first terminal 311 is grounded to GND0, and the feed point 313 can be located between the first terminal 311 and the second terminal 312. The difference is that... Figure 14 The intermediate feed point 313 can be located at the bias towards the first end 311. Figure 15 In the middle, the power supply point 313 can be located at the second end 312.

[0082] As mentioned above, the embodiments of this application may also include the structure of a first matching circuit M1', a second matching circuit M2', or a third matching circuit M3' without specific limitations. M1', M2', or M3' may include, but are not limited to, frequency-selective filtering networks such as capacitors, inductors, and resistors connected in series and / or parallel. In some embodiments, M1', M2', or M3' may include branches formed by multiple capacitors, inductors, and resistors connected in series and / or parallel, and switches controlling the on / off states of these branches. By controlling the on / off states of different switches, the frequency selection parameters of the matching circuit (such as resistance, inductance, and capacitance values) can be adjusted, thereby adjusting the filtering range of the matching circuit and enabling the matching circuit to adjust the corresponding radio frequency signal. Different matching circuits may be different, and their specific circuit implementation is not intended to limit the scope of protection of this application. All matching circuits are used to adjust the impedance of the radiator they are electrically connected to, ensuring that the impedance of the radiator matches the frequency at which it resonates, thereby achieving higher transmit and receive power for the radiator.

[0083] Specifically, the first matching circuit M1' may include a first switching circuit and a plurality of first matching paths connected to the first switch in an open circuit. The first matching circuit is used to control the feed point to be connected to the feed source through the target first matching path by controlling the on / off state of the first switching circuit, so as to switch the value of the first frequency. The target first matching path is one of the plurality of first matching paths.

[0084] The second matching circuit M2' may include a second switching circuit and multiple second matching paths connected to the second switch in an open circuit. Each of the multiple second matching paths includes a capacitor. The second matching circuit is used to control the third terminal to be grounded through the target second matching path by controlling the on / off state of the second switching circuit, so as to switch the value of the second frequency. The target second matching path is one of the multiple second matching paths.

[0085] Specifically, as mentioned above, the second radiator 320 is inductive under the excitation of the feed source ANT1', and the target second matching path is capacitive under the excitation of the feed source ANT1'. The second radiator 320 and the target second matching path form a first resonant circuit so that the second radiator resonates at a second frequency. The second matching circuit is also used to switch the target second matching path through a second switching circuit so as to switch the value of the second frequency through the capacitance in the target second matching path.

[0086] The third matching circuit M3' may include a third switching circuit and multiple third matching paths connected to the third switch in an open circuit. Each of the multiple second matching paths includes a capacitor. The third matching circuit is used to control the fifth terminal to be grounded through the target third matching path by controlling the on / off state of the third switching circuit, so as to switch the value of the third frequency. The target third matching path is one of the multiple third matching paths.

[0087] Specifically, as mentioned above, the third radiator 330 is inductive under the excitation of the feed source ANT1', and the target third matching path is capacitive under the excitation of the feed source ANT1'. The third radiator 330 and the target third matching path form a second resonant circuit so that the third radiator resonates at a third frequency. The third matching circuit is also used to switch the target third matching path through a third switching circuit so as to switch the value of the third frequency through the capacitance in the target third matching path.

[0088] This application does not specifically limit the structure of the first matching path, the second matching path, or the third matching path in its embodiments. Exemplarily, the structure of the first matching path, the second matching path, or the third matching path can be as follows: Figure 16 As shown. Among them, Figure 16 (a) includes a first inductor L1 and a first capacitor C1 connected in series; Figure 16 (b) includes a first inductor L1 and a first capacitor C1 connected in parallel; Figure 16 (c) includes a second capacitor C2 connected in series with the first inductor L1 and the first capacitor C1 connected in parallel; Figure 16 (d) includes a second inductor L2 connected in series with the first inductor L1 and the first capacitor C1 connected in parallel; Figure 16 (e) includes a second capacitor C2 connected in parallel with the first inductor L1 and the first capacitor C1 connected in series; Figure 16 (f) includes a second inductor L2 connected in parallel with the first inductor L1 and the first capacitor C1 connected in series; Figure 16 (g) includes a second inductor L2 and a second capacitor C2 connected in series with the first inductor L1 and the first capacitor C1 connected in parallel, wherein the second inductor L2 and the second capacitor C2 are connected in parallel. Figure 16 (h) includes a second inductor L2 and a second capacitor C2 connected in parallel with the first inductor L1 and the first capacitor C1 connected in series, wherein the second inductor L2 and the second capacitor C2 are connected in series. It should be understood that the structure of the first matching path, the second matching path, or the third matching path is not limited to... Figure 16 The structure shown may also include switches or other impedance adjustment elements.

[0089] like Figure 12-15 As shown, this application embodiment also provides an electronic device 30, in which an antenna 300 can be applied, that is, the electronic device 30 includes any of the antennas 300 described above.

[0090] As mentioned above, the antenna 300 in this embodiment is disposed within the electronic device 30. The following is in conjunction with... Figures 12-15 The arrangement of antenna 300 within electronic device 30 is described exemplarily.

[0091] like Figures 12-15As shown, the electronic device 30 may include a bottom edge 31, a first side edge 32 and a second side edge 33 connected to both ends of the bottom edge, and a top edge 34. The bottom edge 31 may be the downward-facing edge when the user is using the electronic device. The top edge 34 may be the upward-facing edge when the user is using the electronic device. The first side edge 32 and the second side edge 33 may be the left and right-facing edges when the user is using the electronic device, respectively. The first side edge 32 and the second side edge 33 may be the gripping edges when the user holds the electronic device 30, while the bottom edge 31 and the top edge 34 may be the edges that the user does not frequently grip when holding the electronic device 30.

[0092] The embodiments of this application do not specifically limit the placement of the first radiator 310, the second radiator 320, or the third radiator 330 within the electronic device 30, as long as the second radiator 320 and the third radiator 330 are each located at both ends of the first radiator 310 and are respectively formed as parasitic radiators of the first radiator 310.

[0093] To improve the radiation efficiency of the low-frequency antenna when the user is holding the electronic device, the first radiator 310 can be arranged on the top edge 34 or the bottom edge 31.

[0094] Preferably, such as Figures 12-15 As shown, the first radiator 310 can be arranged on the bottom edge 31. The second radiator 320 can be arranged to extend from the bottom edge 31 near the first end 311 to the first side edge 32. The third radiator 330 can be arranged to extend from the bottom edge 31 near the second end 312 to the second side edge 33.

[0095] In some embodiments, in order to ensure the radiation efficiency of the miniaturized monopole antenna, the first end 311 of the first radiator 310 can be disposed near the corner formed by the bottom edge 31 and the first side edge 32, that is, the first end 311 of the first radiator 310 can be disposed at the corner of the electronic device 30, so as to reduce the radiation direction of the ground current when the monopole antenna is grounded, thereby improving the radiation efficiency of the miniaturized monopole antenna.

[0096] This application does not specifically limit the type of electronic device 30, as long as the electronic device 150 needs to achieve wireless communication functionality through a low-frequency antenna. The electronic device 30 can be, for example, a cellular phone, cordless phone, session initiation protocol (SIP) phone, wireless local loop (WLL) station, personal digital assistant (PDA) device, handheld device with wireless communication functionality, computing device or other processing device connected to a wireless modem, in-vehicle device, wearable device, learning machine, electronic dictionary, and smartwatch, etc. Preferably, the electronic device is a foldable electronic device. For example, the electronic device can be an electronic device that can be folded vertically to form a small screen. The folded small screen can also be called a secondary screen.

[0097] Taking mobile phones as an example of electronic devices, 30 Figure 12-15 This is a schematic diagram showing the layout of the antenna 300 in the electronic device 30 according to an embodiment of this application. It should be understood that... Figure 12-15 This is merely an illustration; the electronic device 30 may also include multiple other antennas, and the antenna 300 may be installed at any location on the electronic device 30.

[0098] In the above embodiments, implementation can be achieved, in whole or in part, through software, hardware, firmware, or any other combination. When implemented in software, it can be implemented, in whole or in part, as a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, all or part of the processes or functions described in the embodiments of this disclosure are generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a machine-readable storage medium or transmitted from one machine-readable storage medium to another. For example, the computer instructions can be transmitted from one website, computer, server, or data center to another via wired (e.g., coaxial cable, fiber optic, Digital Subscriber Line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. The machine-readable storage medium can be any available medium accessible to a computer or a data storage device such as a server or data center that integrates one or more available media. The available media can be magnetic media (e.g., floppy disks, hard disks, magnetic tapes), optical media (e.g., digital video discs (DVDs)), or semiconductor media (e.g., solid-state drives (SSDs)).

[0099] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments of this disclosure can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this disclosure.

[0100] In the several embodiments provided in this disclosure, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between apparatuses or units may be electrical, mechanical, or other forms.

[0101] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0102] In addition, the functional units in the various embodiments of this disclosure can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0103] The above description is merely a specific embodiment of this disclosure, but the scope of protection of this disclosure is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this disclosure should be included within the scope of protection of this disclosure. Therefore, the scope of protection of this disclosure should be determined by the scope of the claims.

Claims

1. An antenna, characterized in that, include: The first radiator has a first end, a second end, and a feed point, wherein the second end is a free end; The second radiator has a third end and a fourth end, both of which are grounded ends and the third end is spaced apart from the first end to form a first gap; A feed source is electrically connected to the feed point. The feed source excites the first radiator to resonate at a first frequency. The first end couples the excitation current of the feed source to the second radiator through the first gap magnetic field to excite the second radiator to resonate at a second frequency. The first frequency and the second frequency are frequencies belonging to the low-frequency LB band and the first frequency and the second frequency are different. The third radiator has a fifth end and a sixth end, both of which are grounded ends. The fifth end is spaced apart from the second end to form a second gap. The second end couples the excitation current of the feed source to the third radiator through the electric field of the second gap to excite the third radiator to resonate at a third frequency. The third frequency is a frequency belonging to the LB band and is different from the first frequency and the second frequency.

2. The antenna according to claim 1, characterized in that, The first end of the first radiator forms a strong magnetic field region under the excitation of the feed source, and / or the second end of the first radiator forms a strong electric field region under the excitation of the feed source.

3. The antenna according to claim 1, characterized in that, Also includes: A first matching circuit is connected to the feed point and the feed source respectively. The first matching circuit includes a first switching circuit and a plurality of first matching paths connected to the first switch in an open circuit. The first matching circuit is used to control the feed point to be connected to the feed source through a target first matching path by controlling the on / off state of the first switching circuit, so as to switch the value of the first frequency. The target first matching path is one of the plurality of first matching paths.

4. The antenna according to claim 1, characterized in that, Also includes: The second matching circuit is connected to the third terminal and ground respectively. The second matching circuit includes a second switching circuit and multiple second matching paths connected to the second switch in an open circuit. Each of the multiple second matching paths includes a capacitor. The second matching circuit is used to control the third terminal to be grounded through a target second matching path by controlling the on / off state of the second switching circuit. The target second matching path is one of the multiple second matching paths. The second radiator is inductive under the excitation of the feed source, and the target second matching path is capacitive under the excitation of the feed source. The second radiator and the target second matching path form a first resonant circuit so that the second radiator resonates at the second frequency. The second matching circuit is further configured to switch the target second matching path to switch the value of the second frequency through the capacitor in the target second matching path, and / or the value of the second frequency can be adjusted according to the length of the second radiator.

5. The antenna according to claim 1, characterized in that, Also includes: The third matching circuit is connected to the fifth terminal and ground respectively. The third matching circuit includes a third switching circuit and multiple third matching paths connected to the third switch in an open circuit. Each of the multiple third matching paths includes a capacitor. The third matching circuit is used to control the fifth terminal to be grounded through a target third matching path by controlling the on / off state of the third switching circuit. The target third matching path is one of the multiple third matching paths. The third radiator is inductive under the excitation of the feed source, and the target third matching path is capacitive under the excitation of the feed source. The third radiator and the target third matching path form a second resonant circuit so that the third radiator resonates at the third frequency. The third matching circuit is further configured to switch the target third matching path to switch the value of the third frequency through the capacitor in the target third matching path, and / or the value of the third frequency can be adjusted according to the length of the third radiator.

6. The antenna according to claim 1, characterized in that, The first frequency is a frequency located in a first frequency band, the second frequency is a frequency located in a second frequency band, and the third frequency is a frequency located in a third frequency band. The first frequency band, the second frequency band, and the third frequency band all belong to the LB frequency band, and the first frequency band, the second frequency band, and the third frequency band are all different. The antenna is configured to support the simultaneous switching of the first frequency, the second frequency, and the third frequency within the first frequency band, the second frequency band, and the third frequency band, respectively.

7. The antenna according to claim 1, characterized in that, The feed point is located at the first end, and the first radiator and the feed source form a monopole antenna.

8. The antenna according to claim 1, characterized in that, The feed point is located between the first end and the second end, the first end is the ground end, and the first radiator and the feed source form an inverted F antenna or a composite left-handed antenna.

9. The antenna according to claim 1, characterized in that, The excitation current of the feed source supports the excitation of a first resonant mode, a second resonant mode, and a third resonant mode. The first resonant mode is a quarter-wavelength mode in which the excitation current flows from the second terminal to the feed source, and the first resonant mode is used to support the transmission and reception of signals at the first frequency. The second resonant mode is a first loop mode in which the excitation current flows from the ground connected to the fourth terminal to the ground connected to the third terminal, and the second resonant mode is used to support the transmission and reception of signals at the second frequency. The third resonant mode is a second loop mode in which the excitation current flows from the ground connected to the sixth terminal to the ground connected to the fifth terminal, and the second resonant mode is used to support the transmission and reception of signals at the third frequency.

10. An electronic device, characterized in that, Includes the antenna as described in any one of claims 1 to 9.

11. The electronic device according to claim 10, characterized in that, The electronic device has a bottom edge and a first side edge and a second side edge connected to the bottom edge. A first radiator in the antenna is located on the bottom edge. A second radiator in the antenna extends from a first end on the bottom edge near the first radiator to the first side edge. A third radiator in the antenna extends from a second end on the bottom edge near the first radiator to the second side edge.

12. The electronic device according to claim 11, characterized in that, The first end is located near the corner formed by the bottom edge and the first side edge.

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