CN117458152A - Antenna and electronic equipment - Google Patents

Abstract

The application provides an antenna and electronic equipment. The antenna comprises: the first radiator is provided with a first end, a second end and a feed point, and the second end is a free end; the second radiator is provided with a third end and a fourth end, the third end and the fourth end are both grounded, and the third end and the first end are arranged at intervals to form a first gap; the feed source is electrically connected with the feed point, the feed source excites the first radiator to resonate at a first frequency, the first end couples exciting current of the feed source to the second radiator through a first gap electric field so as to excite the second radiator to resonate at a second frequency, the first frequency and the second frequency are frequencies belonging to a low-frequency LB frequency band, and the first frequency and the second frequency are different. The antenna can improve the radiation efficiency of low-frequency signals under the condition of limited occupied space, thereby improving the communication performance.

Description

Antenna and electronic equipment

Technical Field

The present application relates to the field of communications technologies, and in particular, to an antenna and an electronic device.

Background

With the development of communication technology, a plurality of antennas are required to be arranged in an electronic device such as a mobile phone. The plurality of wires include, for example, a navigation antenna, a low frequency antenna, a medium and high frequency antenna, and the like. Among them, the size of a Low frequency (LB) antenna is large and the performance of the Low frequency antenna is a key factor affecting the communication performance.

Limited by the miniaturization development of electronic devices and the need to provide a plurality of antennas in a limited space of the electronic devices, the communication performance of low-frequency antennas laid out in the related art is limited and needs to be further improved.

Disclosure of Invention

The application provides an antenna and electronic equipment. Various aspects related to embodiments of the present application are described below.

In a first aspect, there is provided an antenna comprising: the first radiator is provided with a first end, a second end and a feed point, wherein the second end is a free end; the second radiator is provided with a third end and a fourth end, the third end and the fourth end are both grounded, and the third end and the first end are arranged at intervals to form a first gap; the feed source is electrically connected with the feed point, the feed source excites the first radiator to resonate at a first frequency, the first end couples exciting current of the feed source to the second radiator through the first slit magnetic field so as to excite the second radiator to resonate at a second frequency, the first frequency and the second frequency are frequencies belonging to a low-frequency LB frequency band, and the first frequency and the second frequency are different.

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

An embodiment of the present application provides an antenna, including: the first radiator is provided with a first end, a second end and a feed point, and the second end is a free end; the second radiator is provided with a third end and a fourth end, the third end and the fourth end are both grounded, and the third end and the first end are arranged at intervals to form a first gap; the feed source is electrically connected with the feed point, the feed source excites the first radiator to resonate at a first frequency, the first end couples exciting current of the feed source to the second radiator through a first gap magnetic field so as to excite the second radiator to resonate at a second frequency, the first frequency and the second frequency are frequencies belonging to a low-frequency LB frequency band, and the first frequency and the second frequency are different. The antenna uses the second radiator as the annular parasitic radiator of the low-frequency antenna, and can excite the second radiator to generate the resonant current of the second frequency while exciting the first radiator to generate the resonant current of the first frequency.

Drawings

Fig. 1 is a schematic structural diagram of an antenna according to an embodiment of the present application.

Fig. 2 (a) is a schematic diagram of one resonant mode of the antenna of fig. 1.

Fig. 2 (b) is a schematic diagram of another resonant mode of the antenna of fig. 1.

Fig. 2 (c) is a schematic diagram of another resonant mode of the antenna of fig. 1.

Fig. 2 (d) is a schematic diagram of another resonant mode of the antenna of fig. 1.

Fig. 3 is a schematic structural diagram of an antenna according to another embodiment of the present application.

Fig. 4 (a) is a schematic diagram of one resonant mode of the antenna of fig. 3.

Fig. 4 (b) is a schematic diagram of another resonant mode of the antenna of fig. 3.

Fig. 5 is a simulation diagram of S-parameters, system radiation efficiency, and overall system efficiency of the antenna of fig. 1.

Fig. 6 is a simulation diagram of S-parameters, system radiation efficiency, and overall system efficiency of the antenna of fig. 3.

Fig. 7 is a schematic structural diagram of an antenna according to another embodiment of the present application.

Fig. 8 (a) is a schematic diagram of one resonant mode of the antenna of fig. 7.

Fig. 8 (b) is a schematic diagram of another resonant mode of the antenna of fig. 7.

Fig. 8 (c) is a schematic diagram of another resonant mode of the antenna of fig. 7.

Fig. 9 is a simulation diagram of S-parameters, system radiation efficiency, and overall system efficiency of the antenna of fig. 7.

Fig. 10 is a simulation diagram of S parameters of a related antenna provided in an embodiment of the present application.

Fig. 11 is a simulation diagram of the radiation efficiency and the overall efficiency of the related antenna system provided in the embodiment of the present application.

Fig. 12 is a schematic structural diagram of an electronic device according to an embodiment of the present application.

Fig. 13 is a schematic structural diagram of an electronic device according to another embodiment of the present application.

Fig. 14 is a schematic structural diagram of an electronic device according to another embodiment of the present application.

Fig. 15 is a schematic structural diagram of an electronic device according to another embodiment of the present application.

Fig. 16 is a schematic structural diagram of a matching path in a matching circuit according to an embodiment of the present application.

Detailed Description

The following description of the technical solutions in the embodiments of the present application will be made clearly and completely with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments.

With the development of electronic technology, electronic devices (such as smartphones, tablet computers, etc.) have become more popular and have more powerful communication functions in people's daily lives. For example, the electronic device needs to have a near field communication function, a navigation function, and a far field communication function. Since different communication functions correspond to different communication frequency bands, the communication frequency band can be subdivided into a plurality of communication frequency bands even under the same communication function.

For example, the communication band of the near field communication function may include a bluetooth communication band, a WIFI band, and an NFC communication band. The WIFI frequency bands may include WIFI2.4G frequency bands and WIFI5G frequency bands. The communication bands of the navigation function may include a GPS-L1 band and a GPS-L5 band. The far-field communication frequency band includes a Low Band (LB), a Mid High Band (MHB) and an Ultra High Band (UHB), and in particular, the far-field communication frequency band may include various frequency bands of an NR frequency band and an LTE frequency band and a combination frequency band to satisfy wireless communication of the electronic device under 2G, 3G, 4G, 5G, and even 6G broadband. The UHB bands may include an N78 band and an N77 band, among others.

In view of this, a plurality of antennas are required to be provided in the electronic apparatus to satisfy various communication functions. The low-frequency antenna of the plurality of antennas is used for realizing the receiving and transmitting of the low-frequency band signals. The low-band signal may refer to a low-band signal enabling 4G and/or 5G communication. The frequency band f1 of the low frequency band signal is typically f1 less than 1GHz. The performance of the low frequency antenna is a key factor affecting the communication performance and the size of the low frequency antenna is large. However, since the number of antennas in the electronic device is large and the headroom in the electronic device is limited, how to provide low-frequency antennas in a limited headroom area is a technical problem to be solved.

As one possible way, as shown in fig. 1, the low frequency antenna 100 within the electronic device 10 may be provided to include a first radiator 110, a second radiator 120, a third radiator 130, and a feed ANT1.

The first radiator 110 may be provided as a T-type antenna. The first radiator 110 includes a first sub-branch 111, and second and third sub-branches 112 and 113 extending outwardly from one end a of the first sub-branch 111 and spaced apart.

The first sub-branch 111 has a first free end 114, a first ground end 115, and a feeding point 116. The feed point 116 is located near one end a and the feed point 116 is connected to the feed ANT1. Alternatively, the feeding point 116 is electrically connected to the feed ANT1 through the first matching circuit M1. The first radiator 110 may be a main radiator of the low frequency antenna 100. The first ground terminal 115 is located between the first free terminal 114 and the feed point 116. The first ground terminal 115 is grounded GND2. Alternatively, the first ground terminal 115 may be grounded GND2 through the second matching circuit M2. The second sub-branch 112 includes a second ground terminal 117, the second ground terminal 117 being located at a distal end of the second sub-branch 112 and the second ground terminal 117 being grounded GND1. The third sub-branch 113 includes a second free end a located at a distal end of the third sub-branch 113.

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

The third radiator 130 includes a fourth ground 131 and a fifth ground 132, and the fourth ground 131 and the third free 121 are spaced apart to form a second gap 133. The fourth and fifth ground terminals 131 and 132 are grounded GND4 and GND5, respectively. Alternatively, the fourth ground 131 may be grounded GND4 through the fourth matching circuit M4. Wherein the third radiator 120 may become a parasitic radiator of the distal end of the main radiator described above through the second slit 133, the second radiator 120, and the first slit 123.

Feed ANT1 is connected to feed point 116 and the excitation current of feed ANT1 may support excitation of four resonant modes. As shown in fig. 2a, the first resonant mode is a quarter wavelength mode of the excitation current from GND1 to the first slot 123, and is accompanied by a strong reverse current from the second slot 133 to GND3. The first resonant mode may also be referred to as the E-H mode. Wherein the first resonant mode is for supporting the transceiving of signals at a first frequency. As shown in fig. 2b, the second resonance mode is the main mode of the LB frequency band, and the second resonance mode is the quarter wavelength mode of the excitation current from GND1 to the first slit 123. The second resonant mode is used to support the transceiving of signals at a second frequency. As shown in fig. 2c, the third resonant mode is a ring mode, from GND5 to GND4. As shown in fig. 2d, the fourth resonance mode is a half wavelength mode of the excitation current from the second free end a to the first free end 114.

Since both the first resonance mode and the second resonance mode require resonance between the quarter wavelength mode from GND1 to the first slit 123, only the first frequency signal supported by the first resonance mode or the second frequency signal supported by the second resonance mode can exist at the same time. In addition, since the second radiator is present between the third radiator and the feed source, the generation of the third resonant mode essentially requires the second radiator to assist in transferring the resonant current coupling of the feed source to the third radiator, and therefore the third frequency signal supported by the third resonant mode cannot exist simultaneously with the first frequency signal or the second frequency signal. In view of this, the low-frequency antenna in this implementation can only achieve single-wave transmission, and therefore, the radiation efficiency of the low-frequency antenna in this implementation is limited, and the communication quality needs to be further improved.

In order to further improve the radiation efficiency of the low-frequency antenna, the embodiment of the application provides a novel structure of the low-frequency antenna. An antenna 300 provided in an embodiment of the present application is described in detail below with reference to fig. 3. It should be appreciated that the antenna 300 may be provided in an electronic device 30 described below.

As shown in fig. 3, the antenna 300 may include a first radiator 310, a second radiator 320, and a feed ANT1'.

The first radiator 310 is a main radiator directly electrically connected to the feed ANT1' to form a low frequency antenna. The structural form of the first radiator 310 is not particularly limited in this embodiment, as long as the first radiator 310 receives and transmits a signal of a first frequency under the excitation of the feed ANT1', and the first radiator 310 has a first end 311, a second end 312 and a feeding point 313. Wherein the first end 311 and the second end 312 together form two ends of the first radiator 310 and the second end 312 is a free end. The feeding point 313 is used for being electrically connected to the feed ANT1', and the position of the feeding point 313 is not specifically limited in the embodiment of the present application, as long as the feeding point 313 is located on the first radiator 310.

As one implementation, the first radiator 310 may be a radiator forming a monopole (monopole) antenna. Monopole antennas are understood to be antennas that do not have a ground directly on the radiator, which may be grounded through a connected feed. Based on this, the feeding point 313 may be located at the first end 311, that is, the first end 311 is the feeding point 313.

As another implementation, the first radiator 310 may be a radiator forming an Inverted-F-Antenna (IFA) or a composite right-and-left-handed (CRLH) Antenna. Based on this, the feeding point 313 may be located between the first end 311 and the second end 312. The first terminal 311 may be a ground terminal and the first terminal 311 is grounded GND0. The detailed description may be found hereinafter.

In this embodiment of the present application, the first end 311 of the first radiator 310 may form a magnetic field strong region (H region) under the excitation of the feed ANT1', and the second end 312 may form an electric field strong region (E region) under the excitation of the feed ANT 1'. The field strength region may also be referred to as a high magnetic field region or a high 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 electric field strong region may also be referred to as a strong electric field region. In the electric field strong region, the electric field generated by the first radiator 310 is greater than the magnetic field generated by the first radiator 310.

Alternatively, a first matching circuit M1 'may be provided between the feed ANT1' and the feed point 313. The first matching circuit M1' may be configured to filter noise of the excitation signal transmitted by the feed ANT1', and may be further configured to perform impedance matching on the excitation signal transmitted by the feed ANT1' to excite the first radiator to resonate at the first frequency. The first matching circuit M1' may also be used to switch the magnitude of the first frequency.

The second radiator 320 has a third end 321 and a fourth end 322, and the third end 321 and the fourth end 322 together form two ends of the second radiator 320, and the third end 321 and the fourth end 322 are both grounded, so the second radiator 320 can be understood as a ring radiator. The third terminal 321 and the fourth terminal 322 may be grounded GND2 and GND1, respectively.

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

The size of the first slot 323 is not specifically limited, so long as the first slot 323 can realize magnetic field coupling of the excitation signal of the feed ANT1' to the second radiator 320.

The feed ANT1 'is electrically connected to the feed point 313, and an excitation signal generated by the feed ANT1' may excite the first radiator 310 to resonate at the first frequency, so as to support the transceiving of the signal at the first frequency. Due to the existence of the first slot 323, the first radiator 310 is excited by the excitation signal generated by the feed source ANT1', and the first end 311 of the first radiator 310 can couple the excitation current of the feed source ANT1' to the second radiator 320 through the first slot 323 magnetic field so as to excite the second radiator 320 to resonate at the second frequency, so as to support the transceiving of the signal of the second frequency. In this embodiment of the present application, the first frequency and the second frequency are both frequencies belonging to the low-frequency LB frequency band, and the first frequency and the second frequency are different.

Alternatively, a second matching circuit M2' may be provided between the third terminal 321 and the ground GND 2. The second matching circuit M2' may be configured to filter noise of the excitation signal, and may be further configured to perform impedance matching on the excitation signal to excite the second radiator to resonate at the second frequency.

In some embodiments, the second matching circuit M2' may include a different capacitance or an adjustable capacitance, where the second radiator 320 is inductive under the excitation of the excitation signal of the feed source, that is, the second radiator 320 is equivalent to the inductance L under the excitation of the feed source, and the inductance L cooperates with the capacitance C in the M2' to form an L-C resonance, that is, form the first resonant circuit, so that by adjusting the size of the capacitance C in the second matching circuit M2', the size of the second frequency can be adjusted.

It should be understood that the magnetic field coupling described in the embodiments of the present application can be understood as coupling the excitation current on the first radiator 310 to the second radiator 320 through the strong magnetic field region (H-region) on the first radiator 310. The strong magnetic field region is usually a region near the feed ANT 1'. In the antenna 100 shown in fig. 3, the first end 311 is a strong magnetic field region.

In the embodiment of the application, the excitation current of the feed ANT1' supports excitation of the first resonance mode and the second resonance mode. The first resonant mode is used for supporting the receiving and transmitting of the first frequency signal, and the second resonant mode is used for supporting the receiving and transmitting of the second frequency signal. For convenience of understanding, the resonant mode supported by the feed ANT1' will be described in detail with reference to fig. 4.

As shown in fig. 4a, the first resonant mode is a quarter wavelength mode of the excitation current from the second end 312 to the feed ANT 1'. As shown in fig. 4b, the second resonance mode is a first ring mode of the excitation current from the ground GND1 connected to the fourth terminal to the ground GND2 connected to the third terminal, which may also be referred to as an H-ring mode.

The signal of the first frequency and the signal of the second frequency supported by the antenna provided by the embodiment of the application can be generated through the first radiator and the second radiator respectively, and because the second radiator 320 is the annular parasitic radiator of the first radiator, the feed source ANT1' connected with the first radiator 310 can be used for simultaneously exciting the first radiator to resonate at the first frequency and the second radiator to resonate at the second frequency, so that two waves can be simultaneously operated, the first frequency and the second frequency can form superposition of low frequency, the radiation efficiency in a main band is improved, and meanwhile, the antenna is simple in structure, so that the radiation efficiency of the low frequency signal is improved under the condition of limited occupied space, and the communication performance is improved.

In order to verify the radiation efficiency of the antenna in the embodiment of the present application, fig. 5 shows a simulation diagram of the system radiation efficiency, the overall system efficiency, and the S parameter of the antenna in fig. 1. Fig. 6 shows a simulation of the system radiation efficiency, the overall system efficiency, and the S-parameters of the antenna of fig. 3.

As shown in fig. 5, the frequency bin generated by the excitation of the feed ANT1 in the antenna 100 includes frequency bins a-d. The frequency points a-d correspond to the first resonant mode to the fourth resonant mode of the antenna 100 in fig. 2, respectively. Specifically, the frequency of the frequency point a is 0.65GHz, the return loss is less than-20 dB, and the total efficiency of the system is-10 dB. The frequency of the frequency point b (the resonant frequency corresponding to the main mode) is 0.75GHz, the return loss is-5.2 dB, and the total efficiency of the system is-4 dB. The frequency of the frequency point c is 0.88GHz, the return loss is-6 dB, and the total efficiency of the system is-6 dB. The frequency of the frequency point d is 1.25GHz, the return loss is less than-5.8 dB, and the total efficiency of the system is-5.8 dB.

As shown in fig. 6, the frequency bin generated by the excitation of the feed ANT1' in the antenna 300 includes frequency bins a-B. Wherein the frequency points a-B correspond to the first resonant mode and the second resonant mode of the antenna 300 in fig. 4, respectively. Specifically, the frequency of the frequency point A (the resonant frequency corresponding to the main mode) is 0.737GHz, the return loss is-8.0458 dB, and the total efficiency of the system is-5 dB. The frequency of the frequency point B is 0.6605GHz, the return loss is-26.473 dB, and the total efficiency of the system is-7.5 dB.

As can be seen from fig. 5 and fig. 6, compared with the antenna 100, the system efficiency difference of the resonant frequencies corresponding to the main modes of the antenna 300 provided in the embodiment of the present application is not large, but the first frequency and the second frequency of the antenna 300 in the embodiment of the present application can coexist at the same time, so that dual-wave co-cutting and dual-wave simultaneous operation can be realized.

In some embodiments, as shown in fig. 7, to further improve the radiation efficiency of the low frequency signal, the antenna 300 may further include a third radiator 330. The third radiator 330 has a fifth end 331 and a sixth end 332. The fifth and sixth ends 331 and 332 are grounded, and the fifth and sixth ends 331 and 332 are grounded GND3 and GND4, respectively. The fifth end 331 is spaced apart from the second end 312 to form a second gap 333.

The second slit 333 makes the third radiator 330 a parasitic radiator of the first radiator 310, and since the second slit 333 is close to a strong electric field region (E region) of the left end of the first radiator 310, the presence of the second slit can achieve electric field coupling between the first radiator 310 and the third radiator 330 is formed as an E-ring parasitic radiator of the first radiator.

In the embodiment of the present application, the second end 312 couples the excitation current of the feed ANT1' to the third radiator 330 through the second slot 333 electric field to excite the third radiator 330 to resonate at the third frequency, so as to support the transceiving of the signal of the third frequency. The third frequency is also a frequency belonging to the LB frequency band, and the third frequency is different from the first frequency and the second frequency.

The size of the second slot 333 is not specifically limited in this embodiment, as long as the second slot 333 can realize electric field coupling of the excitation signal of the feed ANT1' to the third radiator 330.

Optionally, a third matching circuit M3' may be provided between the fifth terminal 331 and the ground GND 3. The third matching circuit M3' may be configured to filter noise of the excitation signal, and may be further configured to perform impedance matching on the excitation signal to excite the third radiator 330 to resonate at a third frequency. In addition, the third matching circuit M3' can also be used to switch the magnitude of the third frequency.

In some embodiments, the third matching circuit M3' may include a different capacitance or an adjustable capacitance, where the third radiator 330 is inductive under the excitation of the excitation signal of the feed source, that is, the third radiator 330 is equivalent to the inductance L under the excitation of the feed source, and the inductance L cooperates with the capacitance C in the M3' to form an L-C resonance, that is, form a second resonance circuit, so that by adjusting the size of the capacitance C in the third matching circuit M3', the size of the third frequency can be adjusted.

In view of this, the resonance modes supported by the excitation current of the feed ANT1' in the antenna 300 in fig. 7 are three resonance modes from the first resonance mode to the third resonance mode. As shown in fig. 8a, the first resonant mode supported by the excitation current of the feed ANT1' in the antenna 300 in fig. 7 corresponds to the resonant mode shown in fig. 4 a. As shown in fig. 8b, the second resonance mode supported by the excitation current of the feed ANT1' in the antenna 300 in fig. 7 coincides with the resonance mode shown in fig. 4 b. In addition, as shown in fig. 8c, the third resonance mode supported by the excitation current of the feed ANT1' in the antenna 300 in fig. 7 is a second loop mode of the excitation current from the ground GND4 connected to the sixth end to the ground GND3 connected to the fifth end, which may also be referred to as an E-loop mode. The third resonant mode is used to support the transmission and reception of signals at a third frequency.

By setting the third radiator 330 as another adjacent parasitic radiator of the first radiator 310, the antenna 300 can generate resonance of the first frequency, the second frequency and the third frequency simultaneously under the excitation of the same feed source, so that three-wave simultaneous operation and three-wave simultaneous cutting can be realized.

In this embodiment of the present application, 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, where the first frequency band, the second frequency band, and the third frequency band belong to the LB frequency band and are different from the first frequency band, the second frequency band, and the third frequency band. In addition, the antenna in the embodiments of the present application may be configured to support simultaneous switching of the first frequency, the second frequency, and the third frequency in the first frequency band, the second frequency band, and the third frequency band, respectively.

To further verify the radiation efficiency of the antenna in the embodiments of the present application, fig. 9 shows a simulation diagram of the system radiation efficiency, the overall system efficiency, and the S-parameters of the antenna 300 in fig. 7.

As shown in fig. 9, the frequency bin generated by the excitation of the feed ANT1' in the antenna 300 includes frequency bins a-C. Wherein the frequency points a-C correspond one-to-one with the first and third resonant modes of the antenna 300 in fig. 8, respectively. Specifically, the frequency of the frequency point A (the resonant frequency corresponding to the main mode) is 0.7235GHz, the return loss is-11.204 dB, and the total efficiency of the system is-5 dB. The frequency of the frequency point B is 0.6605GHz, the return loss is-24.524 dB, and the total efficiency of the system is-7.5 dB. The frequency of the frequency point C is 0.809GHz, the return loss is-12.559 dB, and the total efficiency of the system is-5 dB.

As can be seen from fig. 9, the antenna 300 in fig. 9 can further excite the frequency point C, and the overall system efficiency of the frequency point C is higher, compared to the antenna 300 in fig. 6.

In addition, in order to more clearly understand the improvement of the S parameter and the radiation efficiency of the antenna 300 provided in the embodiment of the present application, fig. 10 shows the S parameter of the antenna in three scenes including only the first radiator, only the first radiator and the second radiator, and including the first radiator, the second radiator, and the third radiator. As can be seen from fig. 10, the antenna including only the first radiator and the second radiator has an increased H-ring resonance around 0.67GHz as compared to the S-parameter of the antenna including only the first radiator. And an antenna including the first radiator, the second radiator, and the third radiator has an S-parameter increased in E-ring resonance located near 0.82GHz as compared to the antenna including only the first radiator and the second radiator.

Fig. 11 shows the radiation efficiency of the antenna in three scenarios including only the first radiator, only the first radiator and the second radiator, and including the first radiator, the second radiator, and the third radiator. As can be seen from fig. 11, the overall efficiency of the system including only the first radiator and the second radiator can improve the main in-band radiation efficiency as compared to the antenna including only the first radiator. Compared with an antenna comprising only the first radiator and the second radiator, the antenna comprising the first radiator, the second radiator and the third radiator can further expand the bandwidth of radiation efficiency in a main band and realize the broadband of LB.

In the present embodiment, the first radiator 310, the second radiator 320, or the third radiator 330 may be formed in any one or more of a flexible circuit board (FPC, flexible Printed Circuit) antenna radiator, a laser direct structuring (LDS, laser Direct Structuring) antenna radiator, a printed direct structuring (PDS, print Direct Structuring) antenna radiator, or a metal bezel.

The shape of the first radiator 310, the second radiator 320, or the third radiator 330 is not particularly limited in the embodiments of the present application. The shape of the first radiator 310, the second radiator 320, or the third radiator 330 includes, but is not limited to, a bent-over, a strip, a sheet, a bar, a coating, a film, etc. When the first radiator 310, the second radiator 320, or the third radiator 330 is in a strip shape, the extending track of the first radiator 310, the second radiator 320, or the third radiator 330 is not limited in this application, as long as the second radiator 320 and the third radiator 330 are respectively located at two ends of the first radiator 310 and are respectively coupled through gaps located at the two ends. For example, the first radiator 310, the second radiator 320, or the third radiator 330 may extend in a straight line, a curved line, a multi-segment bend, or the like. In addition, the first radiator 310, the second radiator 320, or the third radiator 330 may have a uniform width on the extended path, or may have a gradually-changed width, or may have a different width such as a widened region.

As an example, as shown in fig. 3 and 7, the first radiator 310 may have a linear shape. The second radiator 320 and/or the third radiator 330 may be in a meander line shape folded by 90 degrees.

The length of the first radiator 310, the second radiator 320 or the third radiator 330 is not particularly limited, and may be self-adjusted based on the radiation frequency.

As an implementation, as shown in fig. 12 and 13, the first radiator 310 may be the previously described radiator of the monopole antenna, based on which the length of the first radiator 310 may be made relatively small to achieve a miniaturized monopole antenna. In order to secure the radiation efficiency of the miniaturized monopole antenna, the first end 311 of the first radiator 310 may 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 may be disposed at the corner of the electronic device 30 to reduce the radiation direction of the ground current when the monopole antenna is down, thereby improving the radiation efficiency of the miniaturized monopole antenna.

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 may be set according to the second frequency, in other words, the value of the second frequency may be adjusted according to the length of the second radiator 320.

As yet 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 may be set according to the third frequency, in other words, the value of the third frequency may be adjusted according to the length of the third radiator 330. As described above, the type of the first radiator 310 is not particularly limited in the embodiment of the present application, and may be a radiator forming an IFA antenna or a CRLH antenna. For ease of understanding, fig. 14 shows a schematic structural diagram of the antenna 300 when the first radiator 310 is a radiator forming an IFA antenna. Fig. 15 shows a schematic structural diagram of the antenna 300 when the first radiator 310 is a radiator forming a CRLH antenna. In fig. 14 and 15, the first end 311 is grounded GND0 and the feeding point 313 may be located between the first end 311 and the second end 312. In contrast, in fig. 8 the feed point 313 may be located at a bias towards the first end 311, and in fig. 9 the feed point 313 may be located at a bias towards the second end 312.

As described above, the structure of the first matching circuit M1', the second matching circuit M2', or the third matching circuit M3' may be further included in the embodiments of the present application is not particularly limited. M1', M2', or M3' may include, but is not limited to, series and/or parallel arranged capacitive, inductive, resistive, etc. frequency selective filter networks. In some embodiments, M1', M2', or M3' may include a plurality of branches formed by capacitors, inductors, resistors connected in series and/or parallel, and a switch for controlling the on/off of the plurality of branches. The frequency selection parameters (such as resistance value, inductance value and capacitance value) of the matching circuit can be adjusted by controlling the on-off of different switches, so that the filtering range of the matching circuit is adjusted, and the matching circuit can adjust corresponding radio frequency signals. The different matching circuits may be different, and the specific circuit implementation is not intended to limit the protection scope of the present application. The matching circuit is used for adjusting the impedance of the radiator electrically connected with the matching circuit, so that the impedance of the radiator electrically connected with the matching circuit is matched with the frequency of resonance generated by the matching circuit, and further, the receiving and transmitting power of the radiator is higher.

Specifically, the first matching circuit M1' may include a first switching circuit and a plurality of first matching paths connected to the first switching circuit in an open circuit, and the first matching circuit is configured to control the feed point to be connected to the feed source through a target first matching path by controlling an on-off state of the first switching circuit to switch a value of the first frequency, where the target first matching path is one of the plurality of first matching paths.

The second matching circuit M2' may include a second switching circuit and a plurality of second matching paths connected to the second switching circuit in an open circuit, where each of the plurality of second matching paths includes a capacitor, and the second matching circuit is configured to control the third terminal to be grounded through a target second matching path by controlling an on-off state of the second switching circuit so as to switch a value of the second frequency, where the target second matching path is one of the plurality of second matching paths.

Specifically, as described above, the second radiator 320 is inductive under the excitation of the feed ANT1', the target second matching path is capacitive under the excitation of the feed ANT1', the second radiator 320 and the target second matching path form a first resonant circuit to resonate the second radiator at the second frequency, and the second matching circuit is further configured to switch the target second matching path through the second switching circuit to switch the value of the second frequency through the capacitance in the target second matching path.

The third matching circuit M3' may include a third switching circuit and a plurality of third matching paths connected to the third switching circuit in an open circuit, where each of the plurality of second matching paths includes a capacitor, and the third matching circuit is configured to control the fifth end to be grounded through a target third matching path by controlling an on-off state of the third switching circuit so as to switch a value of the third frequency, where the target third matching path is one of the plurality of third matching paths.

Specifically, as previously described, the third radiator 330 is inductive under the excitation of the feed ANT1', the target third matching path is capacitive under the excitation of the feed ANT1', the third radiator 320 and the target third matching path form a second resonant circuit to resonate the third radiator at a third frequency, and the third matching circuit is further configured to switch the target third matching path through the third switching circuit to switch the value of the third frequency through the capacitance in the target third matching path.

The structure of the first matching path, the second matching path, or the third matching path is not specifically limited in the embodiments of the present application. Illustratively, the structure of the first, second, or third matching paths may be as shown in fig. 16. Wherein, fig. 16 (a) includes a first inductor L1 and a first capacitor C1 connected in series; fig. 16 (b) includes a first inductance L1 and a first capacitance C1 connected in parallel; fig. 16 (C) includes a second capacitor C2 connected in series with the first inductor L1 and the first capacitor C1 connected in parallel; fig. 16 (d) includes a second inductor L2 connected in series with the first inductor L1 and the first capacitor C1 connected in parallel; fig. 16 (e) includes a second capacitor C2 connected in parallel with the first inductor L1 and the first capacitor C1 connected in series; fig. 16 (f) includes a second inductor L2 connected in parallel with the first inductor L1 and the first capacitor C1 connected in series; fig. 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; fig. 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 appreciated that the configuration of the first, second, or third matching paths is not limited to that shown in fig. 16, and may also include switches or other impedance adjusting elements.

As shown in fig. 12-15, the embodiment of the present application further provides an electronic device 30, where the antenna 300 may be applied to the electronic device 30, that is, the electronic device 30 includes the antenna 300 described in any of the foregoing.

As described above, the antenna 300 in the embodiment of the present application is disposed in the electronic device 30. The manner in which the antenna 300 is deployed within the electronic device 30 is exemplarily described below in conjunction with fig. 12-15.

As shown in fig. 12-15, the electronic device 30 may include a bottom edge 31, first and second side edges 32, 33 connected to respective ends of the bottom edge, and a top edge 34. Wherein the bottom edge 31 may be a downward facing edge of the user when using the electronic device. The top edge 34 may be an upwardly facing edge of the user when using the electronic device. The first side 32 and the second side 33 may be edges that are directed to the left and right, respectively, when the electronic device is in use by a user. The first side edge 32 and the second side edge 33 may be gripping edges when a user grips the electronic device 30, and the bottom edge 31 and the top edge 34 may be edges that are not commonly gripped when a user grips the electronic device 20.

The arrangement position of the first radiator 310, the second radiator 320, or the third radiator 330 in the electronic device 30 is not particularly limited in the embodiment of the present application, as long as the second radiator 320 and the third radiator 330 are each located at two ends of the first radiator 310 and are each formed as a parasitic radiator of the first radiator 310.

In order to increase the radiation efficiency of the low frequency antenna when the user is holding the electronic device, the first radiator 310 may be arranged to be located on the top side 34 or on the bottom side 31.

Preferably, as shown in fig. 12-15, the first radiator 310 may be arranged to be located on the bottom edge 31. The second radiator 320 may be arranged to extend from the bottom edge 31 near the first end 311 to the first side edge 32. The third radiator 330 may be arranged to extend from the bottom edge 31 near the second end 312 to the second side edge 33.

In some embodiments, to ensure the radiation efficiency of the miniaturized monopole antenna, the first end 311 of the first radiator 310 may 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 may 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 down, thereby improving the radiation efficiency of the miniaturized monopole antenna.

The type of the electronic device 30 is not particularly limited in the embodiment of the present application, as long as the electronic device 150 needs to implement a wireless communication function through a low-frequency antenna. The electronic device 30 may be, for example, a cellular telephone, a cordless telephone, a session initiation protocol (session initiation protocol, SIP) phone, a wireless local loop (wireless local loop, WLL) station, a personal digital (personal digital assistant, PDA) device, a handheld device having wireless communication capabilities, a computing device or other processing device connected to a wireless modem, an in-vehicle device, a wearable device, a learning or electronic dictionary, and a smart watch, among other terminal devices. Preferably, the electronic device is a foldable electronic device. For example, the electronic device may be an electronic device capable of forming a small screen after being folded up and down. The folded small screen may also be referred to as a secondary screen.

Taking the electronic device 30 as an example of a mobile phone, fig. 12-15 are schematic layout diagrams of the antenna 300 in the electronic device 30 according to the embodiment of the present application. It should be appreciated that fig. 12-15 are only one illustration, and that other multiple antennas may be included in electronic device 30 and that antenna 300 may be mounted anywhere on electronic device 30.

In the above embodiments, it may be implemented in whole or in part by software, hardware, firmware, or any other combination. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When loaded and executed on a computer, produces a flow or function in accordance with embodiments of the present disclosure, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a computer network, or other programmable apparatus. The computer instructions may be stored in a machine-readable storage medium or transmitted from one machine-readable storage medium to another machine-readable storage medium, for example, the computer instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center by a wired (e.g., coaxial cable, fiber optic, digital subscriber line (Digital Subscriber Line, DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). The machine-readable storage medium may be any available medium that can be accessed by a computer or a data storage device including one or more servers, data centers, etc. integrated with the available medium. The usable medium may be a magnetic medium (e.g., a floppy Disk, a hard Disk, a magnetic tape), an optical medium (e.g., a digital video disc (Digital Video Disc, DVD)), or a semiconductor medium (e.g., a Solid State Disk (SSD)), or the like.

Those of ordinary skill in the art will appreciate that the elements and algorithm steps described in connection with the embodiments disclosed herein can be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present disclosure.

In the several embodiments provided in the present disclosure, it should be understood that the disclosed systems, devices, and methods may be implemented in other manners. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of the units is merely a logical function division, and there may be additional divisions when actually implemented, e.g., multiple units or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other form.

The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional unit in each embodiment of the present disclosure may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit.

The foregoing is merely specific embodiments of the disclosure, but the protection scope of the disclosure is not limited thereto, and any person skilled in the art can easily think about changes or substitutions within the technical scope of the disclosure, and it is intended to cover the scope of the disclosure. Therefore, the protection scope of the present disclosure shall be subject to the protection scope of the claims.

Claims (13)

1. An antenna, comprising:

the first radiator is provided with a first end, a second end and a feed point, wherein the second end is a free end;

The second radiator is provided with a third end and a fourth end, the third end and the fourth end are both grounded, and the third end and the first end are arranged at intervals to form a first gap;

the feed source is electrically connected with the feed point, the feed source excites the first radiator to resonate at a first frequency, the first end couples exciting current of the feed source to the second radiator through the first slit magnetic field so as to excite the second radiator to resonate at a second frequency, the first frequency and the second frequency are frequencies belonging to a low-frequency LB frequency band, and the first frequency and the second frequency are different.

2. The antenna of claim 1, further comprising:

the third radiator is provided with a fifth end and a sixth end, the fifth end and the sixth end are both grounded ends, the fifth end and the second end are arranged at intervals to form a second gap, the second end couples the excitation current of the feed source to the third radiator through the second gap electric field so as to excite the third radiator to resonate at a third frequency, and the third frequency is a frequency belonging to the LB frequency band and different from the first frequency and the second frequency.

3. The antenna of claim 2, wherein the first end of the first radiator forms a magnetic field strength region upon excitation of the feed and/or the second end of the first radiator forms an electric field strength region upon excitation of the feed.

4. The antenna of claim 1, further comprising:

the first matching circuit is connected with the feed point and the feed source respectively and comprises a first switch circuit and a plurality of first matching paths connected with the first switch in an open circuit mode, and the first matching circuit is used for controlling the feed point to be connected with the feed source through a target first matching path by controlling the on-off state of the first switch circuit so as to switch the value of the first frequency, and the target first matching path is one of the first matching paths.

5. The antenna of claim 1, further comprising:

the second matching circuit is respectively connected with the third end and the ground, and comprises a second switch circuit and a plurality of second matching paths which are connected with the second switch in an open circuit manner, wherein the second matching paths comprise capacitors, the second matching circuit is used for controlling the third end to be grounded through a target second matching path by controlling the on-off state of the second switch circuit, and the target second matching path is one of the second matching paths;

The second radiator is inductive under the excitation of the feed source, the target second matching path is capacitive under the excitation of the feed source, and 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, so as to switch the value of the second frequency through a capacitor in the target second matching path, and/or the value of the second frequency may be adjusted according to the length of the second radiator.

6. The antenna of claim 2, further comprising:

the third matching circuit is respectively connected with the fifth end and the ground, and comprises a third switching circuit and a plurality of third matching paths which are in open circuit connection with the third switch, wherein the third matching paths comprise capacitors, the third matching circuit is used for controlling the fifth end to be grounded through a target third matching path by controlling the on-off state of the third switching circuit, and the target third matching path is one of the third matching paths;

The third radiator is inductive under the excitation of the feed source, the target third matching path is capacitive under the excitation of the feed source, and 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, so as to switch the value of the third frequency through a capacitor in the target third matching path, and/or the value of the third frequency may be adjusted according to the length of the third radiator.

7. The antenna of claim 2, wherein the first frequency is a frequency in a first frequency band, the second frequency is a frequency in a second frequency band, and the third frequency is a frequency in a third frequency band, wherein the first frequency band, the second frequency band, and the third frequency band are the same as the LB frequency band and are different from each other, and the antenna is configured to support simultaneous switching of the first frequency, the second frequency, and the third frequency in the first frequency band, the second frequency band, and the third frequency band, respectively.

8. The antenna of claim 1, wherein the feed point is located at the first end, the first radiator and the feed forming a monopole antenna.

9. The antenna of claim 1, wherein the feed point is located between the first end and the second end, the first end is a ground end, and the first radiator and the feed form an inverted-F antenna or a composite left-right hand antenna.

10. The antenna of claim 2, wherein the excitation current of the feed source supports excitation of a first resonant mode, a second resonant mode, and a third resonant mode, the first resonant mode being a quarter wavelength mode of the excitation current from the second end to the feed source and the first resonant mode being for supporting transceiving of signals at the first frequency, the second resonant mode being a first ring mode of the excitation current from ground at the fourth end to ground at the third end and the second resonant mode being for supporting transceiving of signals at the second frequency, the third resonant mode being a second ring mode of the excitation current from ground at the sixth end to ground at the fifth end and the second resonant mode being for supporting transceiving of signals at the third frequency.

11. An electronic device comprising an antenna according to any one of claims 1-9.

12. The electronic device of claim 11, wherein the electronic device has a bottom edge and first and second sides 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 proximate the first radiator to the first side, and a third radiator in the antenna extends from a second end on the bottom edge proximate the first radiator to the second side.

13. The antenna of claim 12, wherein the first end is located proximate a corner formed by the bottom edge and the first side edge.