Antenna assembly and electronic device

Abstract

The application discloses an antenna assembly and an electronic device, comprising a common body radiator and a near field communication (NFC) antenna radiator, the common body radiator is provided with a first connecting point, a second connecting point and a third connecting point, the second connecting point is grounded through a first switch, and the third connecting point is grounded through a second switch; one end of the NFC antenna radiator is connected with the first connecting point, and the other end of the NFC antenna radiator is connected with the third connecting point. In this way, not only the first switch is arranged at the second connecting point, but also the second switch is additionally arranged at the third connecting point, so that the problem of narrow intermediate frequency antenna bandwidth can be solved, and the antenna performance is improved.

Description

Technical Field

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

[0002] With the rapid development of the communications industry and the continuous improvement of wireless communication technology, Near Field Communication (NFC) technology has ushered in a period of rapid development. Currently, NFC antennas are one of many antenna types used in electronic devices, and they have wide applications in mobile payment, electronic ticketing, access control, mobile identity recognition, anti-counterfeiting, and wireless charging.

[0003] However, electronic devices have limited internal space, and some related technologies involve NFC antennas and cellular antennas sharing a portion of the radiator. In this case, due to insufficient bandwidth of the intermediate frequency (IF) signal, it is impossible to simultaneously achieve the performance of the B3 transmitting band and the B2 receiving band, resulting in poor antenna performance in IF mode. Summary of the Invention

[0004] This application proposes an antenna assembly and electronic device that can solve the problem of narrow intermediate frequency bandwidth, thereby improving antenna performance.

[0005] The technical solution of this application is implemented as follows:

[0006] In a first aspect, embodiments of this application provide an antenna assembly, including:

[0007] A common radiator is provided with a first connection point, a second connection point and a third connection point. The second connection point is grounded through a first switch, and the third connection point is grounded through a second switch.

[0008] The NFC antenna radiator has one end connected to the first connection point and the other end connected to the third connection point.

[0009] In some embodiments, the first switch is a single-pole single-throw switch, and the second switch is a single-pole single-throw switch.

[0010] In some embodiments, when the co-radiator operates in low-frequency mode, the distance from the second connection point to the end of the co-radiator is one-quarter of the low-frequency wavelength; when the co-radiator operates in mid-frequency mode, the distance from the third connection point to the end of the co-radiator is three-quarters of the mid-frequency wavelength.

[0011] In some embodiments, the antenna assembly further includes a first isolation circuit, a first tuning circuit, and a second tuning circuit, wherein:

[0012] The second connection point is connected to one end of the first isolation circuit; the other end of the first isolation circuit is connected to one end of the first tuning circuit and one end of the first switch, and the other end of the first switch is connected to one end of the second tuning circuit; the other end of the first tuning circuit is grounded, and the other end of the second tuning circuit is grounded.

[0013] In some embodiments, the antenna assembly further includes a second isolation circuit, a first filter circuit, a third tuning circuit, and a fourth tuning circuit, wherein:

[0014] The third connection point is connected to one end of the third tuning circuit and one end of the second isolation circuit respectively; the other end of the third tuning circuit is connected to one end of the first filter circuit, and the other end of the first filter circuit is grounded; the other end of the second isolation circuit is connected to one end of the second switch, the other end of the second switch is connected to one end of the fourth tuning circuit, and the other end of the fourth tuning circuit is grounded.

[0015] In some embodiments, the first isolation circuit includes at least one capacitor, the second isolation circuit includes at least one capacitor; the first tuning circuit includes at least one inductor, the second tuning circuit includes at least one inductor, the third tuning circuit includes at least one inductor, and the fourth tuning circuit includes at least one inductor.

[0016] In some embodiments, the antenna assembly further includes a second filtering circuit and a fifth tuning circuit, wherein:

[0017] One end of the NFC antenna radiator is connected to the first connection point through the second filter circuit and the fifth tuning circuit; the other end of the NFC antenna radiator is connected to the third connection point through the first filter circuit and the third tuning circuit.

[0018] In some embodiments, the first connection point is connected to one end of the fifth tuning circuit, one end of the NFC antenna radiator is connected to the other end of the fifth tuning circuit and one end of the second filter circuit, and the other end of the second filter circuit is grounded; the third connection point is connected to one end of the third tuning circuit, the other end of the NFC antenna radiator is connected to the other end of the third tuning circuit and one end of the first filter circuit, and the other end of the first filter circuit is grounded.

[0019] In some embodiments, the second connection point is grounded, and the third connection point is grounded through a third switch; wherein the third switch is a single-pole four-throw switch.

[0020] In some embodiments, the antenna assembly further includes a feed source, and a first connection point is connected to the feed source, wherein:

[0021] The feed source is used to excite the common radiator to transmit and receive target radio frequency signals.

[0022] In some embodiments, the antenna assembly further includes an input matching circuit and a third isolation circuit, wherein:

[0023] One end of the input matching circuit is connected to the feed source, the other end of the input matching circuit is connected to one end of the third isolation circuit, and the other end of the third isolation circuit is connected to the first connection point.

[0024] In some embodiments, the target radio frequency signal includes any one or any combination of multiple frequency bands, such as cellular mobile signal band, WIFI signal band, and GPS signal band.

[0025] Secondly, embodiments of this application provide an electronic device, which includes a housing and an antenna assembly; wherein the antenna assembly is disposed inside the housing, and the antenna assembly is the antenna assembly as described in any one of the first aspects.

[0026] In some embodiments, the electronic device further includes a control circuit board; wherein the control circuit board is disposed inside the housing and is electrically connected to a first switch and a second switch in the antenna assembly, respectively, for controlling the switching state of the first switch and the switching state of the second switch.

[0027] This application provides an antenna assembly and an electronic device. The antenna assembly includes a shared radiator and an NFC antenna radiator. The shared radiator has a first connection point, a second connection point, and a third connection point. The second connection point is grounded through a first switch, and the third connection point is grounded through a second switch. One end of the NFC antenna radiator is connected to the first connection point, and the other end is connected to the third connection point. Thus, in this antenna assembly, not only is there a first switch at the second connection point, but a second switch is also added at the third connection point. The first switch at the second connection point can be used to tune low-frequency signals, and the second switch at the third connection point can be used to tune intermediate frequency signals. This solves the problem of narrow bandwidth of the intermediate frequency antenna, improving the receiving efficiency of B1 and the transmitting efficiency of B3. Furthermore, this antenna assembly also features a shared radiator between the NFC antenna and other antennas, reducing space occupation and making the electronic device thinner and lighter. It also solves the mutual interference between the shared antennas, thereby improving antenna performance. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the composition structure of an NFC shared antenna;

[0029] Figure 2 A schematic diagram of the composition structure of an antenna assembly provided in an embodiment of this application. Figure 1 ;

[0030] Figure 3 This is a schematic diagram of the structure of a shared radiator provided in an embodiment of this application;

[0031] Figure 4A schematic diagram of the composition structure of an antenna assembly provided in an embodiment of this application. Figure 2 ;

[0032] Figure 5 A schematic diagram of the composition structure of an antenna assembly provided in an embodiment of this application. Figure 3 ;

[0033] Figure 6 A schematic diagram of the composition structure of an antenna assembly provided in an embodiment of this application. Figure 4 ;

[0034] Figure 7 A waveform diagram illustrating the gain of an antenna assembly before and after tuning as a function of frequency, provided as an embodiment of this application.

[0035] Figure 8 A schematic diagram of the composition structure of an antenna assembly provided in an embodiment of this application. Figure 5 ;

[0036] Figure 9 A schematic diagram of the composition structure of an antenna assembly provided in an embodiment of this application. Figure 6 ;

[0037] Figure 10 A schematic diagram of the composition structure of an electronic device provided in this application embodiment. Figure 1 ;

[0038] Figure 11 A schematic diagram of the composition structure of an electronic device provided in this application embodiment. Figure 2 . Detailed Implementation

[0039] In order to gain a more detailed understanding of the features and technical content of the embodiments of this application, the implementation of the embodiments of this application will be described in detail below with reference to the accompanying drawings. The accompanying drawings are for reference and illustration only and are not intended to limit the embodiments of this application.

[0040] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing embodiments of this application only and is not intended to limit this application.

[0041] In the following description, references are made to “some embodiments,” which describe a subset of all possible embodiments. However, it is understood that “some embodiments” may be the same subset or different subsets of all possible embodiments and may be combined with each other without conflict.

[0042] It should also be noted that the terms "first, second, and third" used in the embodiments of this application are only used to distinguish similar objects and do not represent a specific order of objects. It is understood that "first, second, and third" can be interchanged in a specific order or sequence where permitted, so that the embodiments of this application described herein can be implemented in an order other than that illustrated or described herein.

[0043] With the rapid development of the communications industry, wireless communication technology is constantly improving. Taking flexible printed circuit (FPC) antenna design as an example, whether using 4G or 5G mobile communication technology, electronic devices typically have an upper antenna on the top and a lower antenna on the bottom. The upper antenna is used for diversity reception (DRX) at the low-mid-high (LMH) frequency band, specifically the LMH DRX band; the lower antenna is used for primary reception (PRX) at the LMH PRX band. Because the upper and lower antennas operate on multiple frequencies, and because antenna performance degrades significantly in handheld scenarios due to hand grip, the primary signal tends to reside on the upper antenna, making its performance particularly important.

[0044] In related technologies, in order to improve the NFC card swiping experience, the upper antenna can be used as an NFC shared antenna. However, the addition of the NFC antenna changes the antenna mode, resulting in a significant performance degradation, especially in the mid-band (MB).

[0045] In one possible implementation, Figure 1 This is a schematic diagram of the structural composition of an NFC shared antenna. (For example...) Figure 1As shown, this is a top-mounted antenna design, located in the upper right corner of the electronic device. This NFC shared antenna can include a cellular antenna ANT11 and an NFC antenna ANT10. The cellular antenna ANT11 is represented by a bold black line and can be composed of multiple radiating segments; the NFC antenna ANT10 is also represented by a black solid line. Furthermore, a first connection point 1, a second connection point 2, and a third connection point 3 are provided on the shared radiating segments. The first connection point 1 is connected to the feed source (i.e., the antenna feed point). The second connection point 2 is grounded via a Single Pole Four Throw (SP4T) switch for switching different low-frequency frequencies. The third connection point 3 is a grounding point. The first connection point 1 is connected to one end of the NFC antenna ANT10, and the third connection point 3 is connected to the other end of the NFC antenna ANT10. This means that the loop between the first connection point 1 and the third connection point 3 is connected to the NFC antenna ANT10, enhancing the card-swiping experience at the top of the electronic device.

[0046] In this implementation, the intermediate frequency bandwidth is insufficient for intermediate frequency signals (1710-2170MHz), making it impossible to simultaneously balance the transmit (TX) performance of B3 (1710MHz) and the receive (RX) performance of B1 (2170MHz). This results in the RX efficiency of B1 being only -9dB or even worse, leading to poor antenna performance in intermediate frequency mode.

[0047] In another possible implementation, this application provides an antenna assembly and an electronic device. In this antenna assembly, not only is there a first switch at the second connection point, but a second switch is also added at the third connection point. The first switch at the second connection point can be used to tune low-frequency signals, and the second switch at the third connection point can be used to tune intermediate frequency signals, thereby solving the problem of narrow bandwidth of the intermediate frequency antenna and improving the receiving efficiency of B1 and the transmitting efficiency of B3. In addition, this antenna assembly also has a shared radiator for the NFC antenna and the cellular antenna. This antenna assembly can reduce the space occupied, making the electronic device thinner and lighter, and also solves the mutual interference between the two shared antennas, thereby improving antenna performance.

[0048] The various embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0049] In one embodiment of this application, Figure 2 A schematic diagram of the composition structure of an antenna assembly provided in an embodiment of this application. Figure 1 .like Figure 2 As shown, the antenna assembly 20 may include a common radiator 21 and an NFC antenna radiator 22, wherein:

[0050] The common radiator 21 is provided with a first connection point 1, a second connection point 2 and a third connection point 3. The second connection point 2 is grounded through the first switch K1 and the third connection point 3 is grounded through the second switch K2.

[0051] One end of the NFC antenna radiator 22 is connected to the first connection point 1, and the other end of the NFC antenna radiator 22 is connected to the third connection point 3.

[0052] It should be noted that, in this embodiment, the antenna assembly 20 includes an NFC antenna system. The NFC antenna system is an antenna that enables wireless communication via Near Field Communication (NFC) technology. Near Field Communication (NFC), also known as short-range wireless communication, is a short-range, high-frequency wireless communication technology that allows contactless point-to-point data transmission and exchange between electronic devices. This technology is based on contactless Radio Frequency Identification (RFID) technology and plays a significant role in mobile payments, public transportation, access control, mobile identity verification, anti-counterfeiting, and wireless charging.

[0053] It should also be noted that, in this embodiment, in addition to the common radiator 21 and the NFC antenna radiator 22, the NFC antenna system also includes an NFC chip, which is a radio frequency transceiver chip used to excite and generate NFC resonance. The NFC antenna radiator 22 can be part of the radiator of the NFC antenna system, while the common radiator 21 is another part of the radiator of the NFC antenna system.

[0054] It should also be noted that, in this embodiment, the NFC antenna radiator 22 can adopt a coil structure, including but not limited to circuit coils manufactured by winding / printing / etching processes, such as FPC coils. Furthermore, the material of the radiator 21 is a conductive material, including but not limited to metals, alloys, conductive oxides, conductive polymers, graphene, etc., without any limitation.

[0055] In some embodiments, such as Figure 2 As shown, the antenna assembly 20 also includes a feed source 23, and the first connection point 1 is connected to the feed source 23. The feed source 23 is used to excite the common radiator 21 to transmit and receive target radio frequency signals.

[0056] It should be noted that, in the embodiments of this application, the target radio frequency signal may include any one or any combination of frequency bands selected from cellular mobile signal bands, Wireless Fidelity (WIFI) signal bands, and Global Positioning System (GPS) signal bands. That is, the target radio frequency signal includes, but is not limited to, the 2G, 3G, 4G, and 5G frequency bands of cellular mobile signals, specifically including, but not limited to, any one or any combination of frequency bands selected from the 4G LB band, 4G MB band, 5G LB band, 5G MB band, 5G HB band, WIFI band, and GPS band.

[0057] It should also be noted that, in this embodiment, the frequency band of the target radio frequency signal is not limited. It can be the LMH band, with a frequency range of 600MHz-2690MHz; or it can be the MH band + N78, with a frequency range of 1700-3800MHz; or it can be the MH band + 5G NR, with a frequency range of 1700-5000MHz. For example, in this embodiment, the target radio frequency signal can be used to transmit and receive in the LMH band, with a frequency range of 600MHz-2690MHz.

[0058] Understandably, in the embodiments of this application, for the first switch K1 and the second switch K2, the first switch K1 can be a single-pole single-throw (SPST) switch, and the second switch K2 can also be a single-pole single-throw switch; or, the first switch K1 and the second switch K2 can also be single-pole double-throw (SPDT) switches, etc. The embodiments of this application do not limit the type of the first switch K1 and the second switch K2.

[0059] It should be noted that in this embodiment, the second connection point 2 is grounded through the first switch K1, which can be used to tune low-frequency signals; the third connection point 3 is grounded through the second switch K2, which can be used to tune intermediate-frequency signals.

[0060] It should also be noted that in the embodiments of this application, the second connection point 2 is grounded through the first switch K1, and the third connection point 3 is grounded through the second switch K2. The term "grounding" here refers to electrical connection to the reference ground GND. The electrical connection method includes, but is not limited to, direct soldering or indirect electrical connection through other auxiliary circuits, such as grounding of devices such as microstrip lines, conductive springs, capacitors, and inductors.

[0061] It is also understood that, in the embodiments of this application, the shared radiator 21 is connected in series with the NFC antenna radiator 22 and can serve as the radiator of the NFC antenna system. Furthermore, the shared radiator 21 can also serve as a conductive structure of the electronic device for other functions. Exemplarily, the shared radiator 21 can be the radiator of other antennas (e.g., cellular antennas), and can simultaneously support the common radiator of two antennas. The shared radiator 21 can simultaneously support multiple frequency band resonances. Due to the reuse of the shared radiator 21, compared to the independent setting of the radiators of two antennas, the total size of the radiators of the two antennas is reduced. Alternatively, in other embodiments, the shared radiator 21 can also serve as a conductive shield in the electronic device. The shared radiator 21 can not only serve as part of the radiator of the NFC antenna system but also as a shield for electronic components in the electronic device, achieving the reuse of the shield.

[0062] In this embodiment, the shared radiator 21 is a shared radiator for the NFC antenna radiator 22 and other antennas (e.g., cellular antennas). The shape of the shared radiator 21 includes, but is not limited to, strip, sheet, plate, rod, coating, and film.

[0063] For example, Figure 3 This is a schematic diagram of a shared radiator provided in an embodiment of this application. Figure 3 As shown, this is a schematic shape and does not limit the shape of the shared radiator 21. In this embodiment, the shared radiator 21 may be strip-shaped. Furthermore, this embodiment does not limit the extension trajectory of the shared radiator 21.

[0064] like Figure 3 As shown, the shared radiator 21 is a long, curved line. In other embodiments, the shared radiator 21 may also extend along a straight line, a curve, or other trajectories. The shared radiator 21 described above may be a line of uniform width along its extension trajectory, or it may be a strip of varying width with gradually changing widths or widened areas; no limitation is made here.

[0065] Regarding the radiation length in low-frequency and medium-frequency modes, in some embodiments, when the common radiator 21 operates in low-frequency mode, the distance from the second connection point 2 to the end of the common radiator is one-quarter of the low-frequency wavelength; when the common radiator 21 operates in medium-frequency mode, the distance from the third connection point 3 to the end of the common radiator is three-quarters of the medium-frequency wavelength.

[0066] It should also be noted that, Figure 3 For the antenna routing scheme, it can be located in the upper right corner of the electronic device. (Still using...) Figure 3For example, 1 represents the location of the first connection point, 2 represents the location of the second connection point, and 3 represents the location of the third connection point. In low-frequency mode, the distance from ground (second connection point 2) to the end can be 1 / 4 of the low-frequency wavelength, such as... Figure 3 The current path is represented by a bold solid line; in intermediate frequency (IF) mode, the path from ground (third connection point 3) to the end can be 3 / 4 of the IF wavelength, such as... Figure 3 The current path is represented by the bold dashed line. Thus, by changing the radiation length at the intermediate frequency (IF), the problem of narrow IF bandwidth can be solved.

[0067] In this embodiment, the shared radiator 21 includes, but is not limited to, the metal frame of an electronic device, a metal frame embedded in a plastic frame, or a metal shared radiator located within or on the surface of a metal frame. The shared radiator is disposed inside the electronic device and includes, but is not limited to, a flexible printed circuit radiator formed on an FPC, a laser direct forming radiator (LDS), a print direct forming radiator (PDS), a conductive sheet radiator (e.g., a metal support radiator), etc.

[0068] In one specific embodiment, the common radiator 21 can be a flexible printed circuit radiator formed on an FPC in an electronic device, but there is no limitation on the specific shape of the common radiator 21.

[0069] In the embodiments of this application, the other antennas where the common radiator 21 is located can be cellular antennas, but they can also be radiators of inverted-F antennas (IFA), planar inverted-F antennas (PIFA), loop antennas, monopole antennas, dipole antennas, etc. There are no restrictions on the specific type of other antennas.

[0070] This application provides an antenna assembly comprising a shared radiator and an NFC antenna radiator. The shared radiator has a first connection point, a second connection point, and a third connection point. The second connection point is grounded via a first switch, and the third connection point is grounded via a second switch. One end of the NFC antenna radiator is connected to the first connection point, and the other end is connected to the third connection point. This antenna assembly not only solves the problem of narrow bandwidth in intermediate frequency antennas, improving the receiving efficiency of B1 and the transmitting efficiency of B3, but also allows the NFC antenna to share a radiator with other antennas (such as cellular antennas), reducing space occupation and making electronic devices thinner and lighter.

[0071] In another embodiment of this application, in Figure 2 Based on the antenna assembly 20 shown, Figure 4 A schematic diagram of the composition structure of an antenna assembly provided in an embodiment of this application. Figure 2 .like Figure 4 As shown, the antenna assembly 20 may also include a first isolation circuit 41, a first tuning circuit 42, and a second tuning circuit 43.

[0072] Wherein, the second connection point 2 is connected to one end of the first isolation circuit 41; the other end of the first isolation circuit 41 is connected to one end of the first tuning circuit 42 and one end of the first switch K1 respectively, and the other end of the first switch K1 is connected to one end of the second tuning circuit 43; the other end of the first tuning circuit 42 is grounded, and the other end of the second tuning circuit 42 is grounded.

[0073] Furthermore, in Figure 4 Based on the antenna assembly 20 shown, continue to refer to Figure 4 The antenna assembly 20 may also include a second isolation circuit 44, a first filter circuit 45, a third tuning circuit 46, and a fourth tuning circuit 47.

[0074] The third connection point 3 is connected to one end of the third tuning circuit 46 and one end of the second isolation circuit 44 respectively; the other end of the third tuning circuit 46 is connected to one end of the first filter circuit 45, and the other end of the first filter circuit 45 is grounded; the other end of the second isolation circuit 44 is connected to one end of the second switch K2, the other end of the second switch K2 is connected to one end of the fourth tuning circuit 47, and the other end of the fourth tuning circuit 47 is grounded.

[0075] It should be noted that, in the embodiments of this application, the first isolation circuit 41 may include at least one capacitor, the second isolation circuit 44 may include at least one capacitor; the first tuning circuit 42 may include at least one inductor, the second tuning circuit 43 may include at least one inductor, the third tuning circuit 46 may include at least one inductor, and the fourth tuning circuit 47 may include at least one inductor.

[0076] It should also be noted that, in the embodiments of this application, other antennas are cellular antennas as an example. The first isolation circuit 41 and the second isolation circuit 44 can be used to isolate NFC antenna signals, the first filter circuit 45 can be used to filter out cellular signals, and the first tuning circuit 42, the second tuning circuit 43, the third tuning circuit 46 and the fourth tuning circuit 47 can be used to perform frequency tuning of cellular signals, thereby improving the mutual influence between the cellular antenna and the NFC antenna sharing the radiator, and thus improving antenna performance.

[0077] In some embodiments, to further improve NFC performance, Figure 4Based on the antenna assembly 20 shown, see... Figure 5 The antenna assembly 20 may also include a second filter circuit 48 and a fifth tuning circuit 49.

[0078] One end of the NFC antenna radiator 22 is connected to the first connection point 1 through the second filter circuit 48 and the fifth tuning circuit 49; the other end of the NFC antenna radiator 22 is connected to the third connection point 3 through the first filter circuit 45 and the third tuning circuit 46.

[0079] In this embodiment, the second filter circuit 48 and the fifth tuning circuit 49 can form a first matching circuit, and one end of the NFC antenna radiator 22 is connected to the first connection point 1 through the first matching circuit; the first filter circuit 45 and the third tuning circuit 46 can form a second matching circuit, and the other end of the NFC antenna radiator 22 is connected to the third connection point 3 through the second matching circuit. Thus, the first and second matching circuits can improve NFC performance, thereby enhancing the card-swiping experience on the top of the electronic device.

[0080] In this embodiment, the first connection point 1 is connected to one end of the fifth tuning circuit 49, one end of the NFC antenna radiator 22 is connected to the other end of the fifth tuning circuit 49 and one end of the second filter circuit 48, and the other end of the second filter circuit 48 is grounded; the third connection point 3 is connected to one end of the third tuning circuit 46, the other end of the NFC antenna radiator 22 is connected to the other end of the third tuning circuit 46 and one end of the first filter circuit 45, and the other end of the first filter circuit 45 is grounded.

[0081] It should also be noted that, in this embodiment, the first filter circuit 45 may include at least one capacitor, the second filter circuit 48 may include at least one capacitor, and the fifth tuning circuit 49 may include at least one inductor. Here, when the NFC antenna system is operating, both the first filter circuit 45 and the second filter circuit 48 can filter out cellular signals, thereby improving NFC performance.

[0082] Furthermore, for the first connection point 1, in Figure 5 Based on the antenna assembly 20 shown, continue to refer to Figure 5 The antenna assembly 20 may also include an input matching circuit 50 and a third isolation circuit 51.

[0083] One end of the input matching circuit 50 is connected to the feed source 23, and the other end of the input matching circuit 50 is connected to one end of the third isolation circuit 51. The other end of the third isolation circuit 51 is connected to the first connection point 1.

[0084] It should also be noted that, in this embodiment, the feed source 23 is used to excite the common radiator 21 to transmit and receive target radio frequency signals. The third isolation circuit 51 may include at least one capacitor. The third isolation circuit 51 is a band-stop circuit for NFC signals and a band-pass circuit for the target radio frequency signal (LMH band). In other words, the third isolation circuit 51 can also be used to isolate NFC signals.

[0085] It should also be noted that, in the embodiments of this application, the input matching circuit 50 may include at least one capacitor and / or at least one inductor for signal matching of the target radio frequency signal.

[0086] It should also be noted that, in the embodiments of this application, the target radio frequency signal includes, but is not limited to, the 2G, 3G, 4G, and 5G frequency bands of cellular mobile signals, specifically including, but not limited to, any one or any combination of frequency bands selected from the 4G LB band, 4G MB band, 5G LB band, 5G MB band, 5G HB band, WIFI band, and GPS band. For example, the target radio frequency signal can be used to transmit and receive the LMH band, with a frequency range of 600MHz-2690MHz.

[0087] This application provides an antenna assembly comprising a shared radiator and an NFC antenna radiator. The shared radiator has a first connection point, a second connection point, and a third connection point. The second connection point is grounded via a first switch, and the third connection point is grounded via a second switch. One end of the NFC antenna radiator is connected to the first connection point, and the other end is connected to the third connection point. This antenna assembly not only solves the problem of narrow bandwidth in intermediate frequency antennas, improving the receiving efficiency of B1 and the transmitting efficiency of B3, but also resolves the mutual interference between the NFC antenna and other antennas (e.g., cellular antennas) sharing the same radiator, thereby improving antenna performance.

[0088] In yet another embodiment of this application, in Figure 5 Based on the antenna assembly 20 shown, Figure 6 A schematic diagram of the composition structure of an antenna assembly provided in an embodiment of this application. Figure 4 .like Figure 6 As shown, the antenna assembly 20 includes a common radiator 21, an NFC antenna radiator 22, a feed 23, a first switch K1, a second switch K2, a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, a seventh capacitor C7, an eighth capacitor C8, a ninth capacitor C9, a first inductor L1, a second inductor L2, a third inductor L3, a fourth inductor L4, and a fifth inductor L5.

[0089] It should be noted that in this embodiment, both the first switch K1 and the second switch K2 are SPST switches. Additionally, the first isolation circuit includes a second capacitor C2, the second isolation circuit includes a fourth capacitor C4, the third isolation circuit includes a first capacitor C1, the first filter circuit includes a fifth capacitor C5, the second filter circuit includes a third capacitor C3, the first tuning circuit includes a second inductor L2, the second tuning circuit includes a third inductor L3, the third tuning circuit includes a fourth inductor L4, the fourth tuning circuit includes a fifth inductor L5, the fifth tuning circuit includes a first inductor L1, and the input matching circuit includes a sixth capacitor C6, a seventh capacitor C7, an eighth capacitor C8, and a ninth capacitor C9; the feed source 23 is used to excite the common radiator 21 to transmit and receive target radio frequency signals (LMH band).

[0090] It should also be noted that, in this embodiment, the first capacitor C1, the second capacitor C2, and the fourth capacitor C4 are isolation capacitors used to isolate NFC signals; the third capacitor C3 and the fifth capacitor C5 are filter capacitors used to filter out cellular signals. Furthermore, the tuning of the cellular signal can be switched by adjusting the second inductor L2, the third inductor L3, the fourth inductor L4, and the fifth inductor L5.

[0091] In one specific embodiment, the second inductor L2 can be set to 18nH, the third inductor L3 can be set to 7.5nH, the fourth inductor L4 can be set to 22nH, and the fifth inductor L5 can be set to 12nH. In this case, Figure 7 This is a waveform diagram illustrating the gain of an antenna assembly before and after tuning as a function of frequency, provided as an embodiment of this application. Figure 7 As shown, the Tr1 waveform is represented by a bold black solid line, the Tr2 waveform by a dashed line, the Tr3 waveform by a dotted-dash line, and the Tr4 waveform by a thin solid line. Furthermore, point 1 corresponds to a frequency of 748.000MHz, point 2 to 900.505MHz, point 3 to 1710MHz, point 4 to 1880MHz, point 5 to 2170MHz, point 6 to 2300MHz, point 7 to 2400MHz, point 8 to 2500MHz, and point 9 to 2690MHz.

[0092] It should also be noted that, in the embodiments of this application, the Tr1 waveform corresponds to the waveform when the first switch K1 is closed and the second switch K2 is closed; the Tr2 waveform corresponds to the waveform when the first switch K1 is closed and the second switch K2 is open; the Tr3 waveform corresponds to the waveform when the first switch K1 is open and the second switch K2 is open; and the Tr4 waveform corresponds to the waveform when the first switch K1 is open and the second switch K2 is closed.

[0093] In simple terms, the Tr3 and Tr2 waveforms are as follows: the inductance at the third connection point 3 is 22nH, and then the first switch K1 at the second connection point 2 switches between closing and opening, causing the inductance to switch between 7.5nH and 18nH. The Tr4 and Tr1 waveforms are as follows: the inductance at the third connection point 3 is 12nH, and then the first switch K1 at the second connection point 2 switches between closing and opening, causing the inductance to switch between 7.5nH and 18nH. It is important to note that the switching between 7.5nH and 18nH specifically means that when the first switch K1 is open, the actual inductance value at the second connection point 2 is the second inductor L2 (18nH); when the first switch K1 is closed, the 7.5nH value is not the actual inductance value at the second connection point 2, but rather the parallel connection of the second inductor L2 (18nH) and the third inductor L3 (7.5nH). Similarly, for the third connection point 3, if the second switch K2 is open, the actual inductance value at the third connection point 3 is the fourth inductor L4 (22nH); if the second switch K2 is closed, the switched 12nH is not the actual inductance value at the third connection point 3. At this time, the actual inductance value at the third connection point 3 is the parallel connection of the fourth inductor L4 (22nH) and the fifth inductor L5 (12nH).

[0094] Thus, taking the Tr2 waveform as an example, from Figure 7 As can be seen, the gain is -1.1433dB at point 1 (frequency 748.000MHz); -9.5403dB at point 2 (frequency 900.505MHz); -2.3160dB at point 3 (frequency 1710MHz); -5.4727dB at point 4 (frequency 1880MHz); -4.8212dB at point 5 (frequency 2170MHz); -2.9962dB at point 6 (frequency 2300MHz); -2.2745dB at point 7 (frequency 2400MHz); -2.0113dB at point 8 (frequency 2500MHz); and -2.0115dB at point 9 (frequency 2690MHz).

[0095] It should also be noted that in the embodiments of this application, the larger the negative gain value, the worse the antenna performance; the smaller the negative gain value, the better the antenna performance. Therefore, when the second switch K2 is open, that is, when the 22nH inductor is switched at the third connection point 3, the B3 TX (1710MHz) performance can be satisfied; when the second switch K2 is closed, that is, when the 12nH inductor is switched at the third connection point 3, the B1RX (2170MHz) performance can be satisfied.

[0096] For example, the gain test results for B1 and B3 performance with inductance of 22nH and 12nH are shown in Table 1. Here, the antenna assembly switch is changed from one SP4T switch to two SPST switches, while the cost remains unchanged. However, as shown in Table 1, when the 12nH inductor is switched at the third connection point 3, the RX of B1 increases from -9.48dB to -5.58dB, which is an efficiency improvement of 3.9dB. In other words, the antenna performance is significantly improved.

[0097] Table 1

[0098]

[0099] This application provides an antenna assembly. The specific implementation of the aforementioned embodiments has been described in detail through the above embodiments. It can be seen that the antenna solution of the related technology has been modified, specifically by adjusting one SP4T switch to two SPST switches. One SPST switch is connected to the second connection point 2, and the other SPST switch is connected to the third connection point 3. This not only solves the problem of narrow bandwidth of intermediate frequency antenna, but also solves the problem of mutual interference between cellular antenna and NFC antenna sharing the same radiator, thereby improving antenna performance.

[0100] In yet another embodiment of this application, based on the antenna assembly 20 described in the foregoing embodiments, Figure 8 A schematic diagram of the composition structure of an antenna assembly provided in an embodiment of this application. Figure 5 .like Figure 8 As shown, the antenna assembly 20 may include a common radiator 21 and an NFC antenna radiator 22. The common radiator 21 is provided with a first connection point 1, a second connection point 2, and a third connection point 3. The second connection point 2 is grounded, and the third connection point 3 is grounded through a third switch K3. One end of the NFC antenna radiator 22 is connected to the first connection point 1, and the other end of the NFC antenna radiator 22 is connected to the third connection point 3.

[0101] It should be noted that in this embodiment, the third switch is a Single Pole Four Throw (SP4T) switch. That is, the SP4T switch at the second connection point 2 can be removed, and then the SP4T switch can be placed at the third connection point 3, which can also solve the problem of narrow intermediate frequency bandwidth caused by the shared upper antenna. In this embodiment, the low-frequency performance is somewhat reduced, but the intermediate frequency performance is relatively better.

[0102] It should also be noted that, in the embodiments of this application, "grounding" refers to an electrical connection to the reference ground GND. The electrical connection method includes, but is not limited to, direct soldering or indirect electrical connection through other auxiliary circuits, such as grounding devices such as microstrip lines, conductive springs, capacitors, and inductors.

[0103] In one specific embodiment, based on the antenna assembly 20 described in the foregoing embodiments, Figure 9 A schematic diagram of the composition structure of an antenna assembly provided in an embodiment of this application. Figure 6 .like Figure 9 As shown, no switch is installed at the second connection point 2. Specifically, the second connection point 2 is connected to one end of the first isolation circuit 41, and the other end of the first isolation circuit 41 is connected to one end of the sixth tuning circuit 91, which is grounded. The sixth tuning circuit 91 includes at least one inductor, and through its function, low-frequency signal tuning of the cellular signal can be achieved.

[0104] A switch is installed at the third connection point 3, where the third switch K3 is an SP4T switch. Specifically, the third connection point 3 is connected to one end of the third tuning circuit 46 and one end of the second isolation circuit 44; the other end of the third tuning circuit 46 is connected to one end of the first filter circuit 45, and the other end of the first filter circuit 45 is grounded; the other end of the second isolation circuit 44 is connected to the fixed end of the third switch K3; the first switching end of the third switch K3 is connected to one end of the seventh tuning circuit 92; the second switching end of the third switch K3 is connected to one end of the eighth tuning circuit 93; the third switching end of the third switch K3 is connected to one end of the ninth tuning circuit 94; the fourth switching end of the third switch K3 is connected to one end of the tenth tuning circuit 95; and the other end of the seventh tuning circuit 92, the other end of the eighth tuning circuit 93, the other end of the ninth tuning circuit 94, and the other end of the tenth tuning circuit 95 are all grounded.

[0105] It should also be noted that, in the embodiments of this application, the seventh tuning circuit 92 includes at least one inductor, the eighth tuning circuit 93 includes at least one inductor, the ninth tuning circuit 94 includes at least one inductor, and the tenth tuning circuit 95 includes at least one inductor, thereby enabling intermediate frequency signal tuning of cellular signals.

[0106] This application provides an antenna assembly comprising a shared radiator and an NFC antenna radiator. The shared radiator has a first connection point, a second connection point, and a third connection point. The second connection point is grounded, and the third connection point is grounded via a third switch. One end of the NFC antenna radiator is connected to the first connection point, and the other end is connected to the third connection point. This eliminates the need for a switch at the second connection point, instead using a third switch (e.g., an SP4T switch) at the third connection point. This addresses the narrow bandwidth issue of the intermediate frequency antenna, improving the receiving efficiency of B1 and the transmitting efficiency of B3. Furthermore, this antenna assembly allows the NFC antenna to share a radiator with other antennas, reducing space requirements and resolving the mutual interference between the shared antennas, thereby improving antenna performance.

[0107] In yet another embodiment of this application, based on the antenna assembly 20 described in the foregoing embodiments, Figure 10 A schematic diagram of the composition structure of an electronic device provided in this application embodiment. Figure 1 .like Figure 10 As shown, the electronic device 100 may include a housing 1001 and an antenna assembly 20 as described in any of the foregoing embodiments. The antenna assembly 20 is disposed inside the housing 1001.

[0108] It should be noted that, in this embodiment, the housing 1001 forms the outer contour of the electronic device 100 to accommodate the electronic devices and functional components of the electronic device 100, and also provides a sealing and protection function for the electronic devices and functional components inside the electronic device 100. For example, the circuit boards, sensors, and other functional components of the electronic device 100 can be disposed inside the housing 1001.

[0109] It should also be noted that the antenna assembly 20 may include multiple antennas for transmitting wireless signals, such as radiating wireless signals to the outside and receiving wireless signals radiated by base stations or other electronic devices, thereby realizing the wireless communication function of the electronic device 100.

[0110] For example, when the antenna assembly 20 is mounted on the electronic device 100, the electronic device 100 can perform functions such as electronic payment, reading information from other NFC devices or tags, and data exchange and services. The electronic device 100 includes, but is not limited to, mobile phones, smart wearable devices (such as smartwatches, smart glasses, etc.), laptops, PDAs, digital cameras, and personal digital assistants (PDAs). Furthermore, the NFC antenna system can also operate between mobile devices and certain target devices. For example, a point-of-sale system at a store checkout, or a tag device with a built-in near-field communication chip. The electronic device 100 provided in this application can be either an initiating device or a target device; no limitation is made here.

[0111] In one specific embodiment, Figure 11 A schematic diagram of the composition structure of an electronic device provided in this application embodiment. Figure 2 .like Figure 11 As shown, the electronic device 100 may include: a common radiator 21, an NFC antenna radiator 22, and a first connection point 1, a second connection point 2, and a third connection point 3 disposed on the common radiator 21. The second connection point 2 is grounded through a first switch K1, and the third connection point 3 is grounded through a second switch K2. One end of the NFC antenna radiator 22 is connected to the first connection point 1, and the other end of the NFC antenna radiator 22 is connected to the third connection point 3. The first switch K1 and the second switch K2 are SPST switches. Furthermore, the electronic device 100 may also include a housing 1001, a rear camera 1002, a front camera 1003, and a speaker box 1004.

[0112] It should be noted that, in Figure 11 In this context, it could be an antenna scheme for an FPC, with the antenna assembly described in the aforementioned embodiment specifically located at the upper right corner of the electronic device 100.

[0113] It should also be noted that, in Figure 11 This paper presents a co-design of an NFC antenna with other antennas, specifically a cellular NFC co-antenna design, which addresses the narrow intermediate frequency (IF) bandwidth and improves the efficiency of B1 RX and B3 TX. Specifically, the low-frequency mode has a radiation length from ground (second connection point 2) to the end equal to 1 / 4 wavelength, while the IF mode has a radiation length from ground (third connection point 3) to the end equal to 3 / 4 wavelength. The narrow IF bandwidth issue can be resolved by changing the radiation length of the IF mode.

[0114] It should also be noted that, in Figure 11In this configuration, the first connection point 1 serves as the antenna feed point, connected to the feed source 23, and is used to excite the co-radiator 21 to transmit and receive target radio frequency signals. The switch at the second connection point 2 is changed from an SP4T switch to an SPST switch, and an SPST switch is added at the third connection point 3. This maintains the same cost, using the SPST switch at the third connection point 3 to tune the intermediate frequency signal, and the SPST switch at the second connection point 2 to tune the low-frequency signal, thus also resolving the mutual interference problem of the cellular NFC co-antenna.

[0115] In some embodiments, the electronic device 100 may further include a control circuit board (not shown). The control circuit board is disposed inside the housing 1001 and is electrically connected to a first switch K1 and a second switch K2 in the antenna assembly, respectively, for controlling the switching states of the first switch K1 and the second switch K2. The switching states may include a closed state and an open state.

[0116] This application provides an electronic device that can be used to tune low-frequency signals by controlling the opening and closing of a first switch K1; and to tune intermediate-frequency signals by controlling the opening and closing of a second switch K1. This solves the problem of narrow bandwidth of the intermediate-frequency antenna, improves the receiving efficiency of B1 and the transmitting efficiency of B3. In addition, the antenna assembly also has a shared radiator for the NFC antenna and the cellular antenna, which not only reduces the space occupied, making the electronic device thinner and lighter, but also solves the mutual interference between the two shared antennas, takes into account the antenna performance requirements of the cellular antenna and the NFC antenna, and ultimately improves the performance of the electronic device.

[0117] It should be noted that, in this application, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0118] The sequence numbers of the embodiments in this application are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0119] The methods disclosed in the several method embodiments provided in this application can be arbitrarily combined without conflict to obtain new method embodiments.

[0120] The features disclosed in the several product embodiments provided in this application can be arbitrarily combined without conflict to obtain new product embodiments.

[0121] The features disclosed in the several method or device embodiments provided in this application can be arbitrarily combined without conflict to obtain new method or device embodiments.

[0122] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An antenna assembly, characterized in that, include: A shared radiator is provided with a first connection point, a second connection point, and a third connection point. The second connection point is grounded through a first switch, and the third connection point is grounded through a second switch. A near-field communication (NFC) antenna radiator, one end of which is connected to the first connection point, and the other end of which is connected to the third connection point; The antenna assembly further includes a feed source, and the first connection point is connected to the feed source; When the co-radiator is operating in low-frequency mode, the distance from the second connection point to the end of the co-radiator is one-quarter of the low-frequency wavelength. When the common radiator is operating in intermediate frequency mode, the distance from the third connection point to the end of the common radiator is three-quarters of the intermediate frequency wavelength.

2. The antenna assembly according to claim 1, characterized in that, The first switch is a single-pole single-throw switch, and the second switch is a single-pole single-throw switch.

3. The antenna assembly according to claim 1, characterized in that, The antenna assembly further includes a first isolation circuit, a first tuning circuit, and a second tuning circuit, wherein: The second connection point is connected to one end of the first isolation circuit; The other end of the first isolation circuit is connected to one end of the first tuning circuit and one end of the first switch, and the other end of the first switch is connected to one end of the second tuning circuit. The other end of the first tuning circuit is grounded, and the other end of the second tuning circuit is grounded.

4. The antenna assembly according to claim 3, characterized in that, The antenna assembly further includes a second isolation circuit, a first filter circuit, a third tuning circuit, and a fourth tuning circuit, wherein: The third connection point is connected to one end of the third tuning circuit and one end of the second isolation circuit, respectively. The other end of the third tuning circuit is connected to one end of the first filter circuit, and the other end of the first filter circuit is grounded. The other end of the second isolation circuit is connected to one end of the second switch, the other end of the second switch is connected to one end of the fourth tuning circuit, and the other end of the fourth tuning circuit is grounded.

5. The antenna assembly according to claim 4, characterized in that, The first isolation circuit includes at least one capacitor, the second isolation circuit includes at least one capacitor; the first tuning circuit includes at least one inductor, the second tuning circuit includes at least one inductor, the third tuning circuit includes at least one inductor, and the fourth tuning circuit includes at least one inductor.

6. The antenna assembly according to claim 4, characterized in that, The antenna assembly further includes a second filtering circuit and a fifth tuning circuit, wherein: One end of the NFC antenna radiator is connected to the first connection point through the second filter circuit and the fifth tuning circuit. The other end of the NFC antenna radiator is connected to the third connection point through the first filtering circuit and the third tuning circuit.

7. The antenna assembly according to claim 6, characterized in that, The first connection point is connected to one end of the fifth tuning circuit, and one end of the NFC antenna radiator is connected to the other end of the fifth tuning circuit and one end of the second filter circuit, respectively. The other end of the second filter circuit is grounded. The third connection point is connected to one end of the third tuning circuit, and the other end of the NFC antenna radiator is connected to the other end of the third tuning circuit and one end of the first filter circuit, respectively. The other end of the first filter circuit is grounded.

8. The antenna assembly according to claim 1, characterized in that, The second connection point is grounded, and the third connection point is grounded through a third switch; wherein the third switch is a single-pole four-throw switch.

9. The antenna assembly according to any one of claims 1 to 8, characterized in that, The feed source is used to excite the common radiator to transmit and receive target radio frequency signals.

10. The antenna assembly according to claim 9, characterized in that, The antenna assembly further includes an input matching circuit and a third isolation circuit, wherein: One end of the input matching circuit is connected to the feed source, the other end of the input matching circuit is connected to one end of the third isolation circuit, and the other end of the third isolation circuit is connected to the first connection point.

11. The antenna assembly according to claim 9, characterized in that, The target radio frequency signal includes any one or any combination of multiple frequency bands, such as cellular mobile signal band, WIFI signal band, and GPS signal band.

12. An electronic device, characterized in that, The electronic device includes a housing and an antenna assembly; wherein the antenna assembly is disposed inside the housing, and the antenna assembly is the antenna assembly as described in any one of claims 1 to 11.

13. The electronic device according to claim 12, characterized in that, The electronic device further includes a control circuit board; wherein the control circuit board is disposed inside the housing, and the control circuit board is electrically connected to a first switch and a second switch in the antenna assembly, respectively, for controlling the switching state of the first switch and the switching state of the second switch.

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