An antenna assembly and a terminal device

Abstract

The application provides an antenna assembly and a terminal device, wherein the antenna assembly comprises a first radiating arm and a blocking circuit, the blocking circuit has a first state and a second state, in the first state, the blocking circuit conducts a path of a medium frequency signal between a first grounding point and the ground, in the second state, the blocking circuit breaks the path of the medium frequency signal between the first grounding point and the ground, and the application has the advantages that compared with the related art, the selective conduction of the blocking circuit on the path of the medium frequency signal can break the path of a medium frequency noise signal on the first radiating arm without affecting the transmission of a low frequency signal by the first radiating arm, so that the medium frequency noise signal cannot form a complete loop on the first radiating arm, thereby reducing the interference between antennas and improving the performance of the antennas.

Description

Technical Field

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

[0002] As the number of antennas increases, isolation issues can easily arise among the antennas within a small space, causing them to interfere with each other and resulting in a decrease in antenna performance. Summary of the Invention

[0003] This application aims to at least partially address one of the technical problems in the related art.

[0004] Therefore, the purpose of this application is to provide an antenna assembly and a terminal device.

[0005] To achieve the above objectives, the first aspect of this application provides an antenna assembly comprising: a first radiating arm, one end of which is provided with a first feed point connected to a low-frequency signal, and the other end of which is provided with a first ground point and a second ground point, the first ground point being located between the second ground point and the first feed point, both the first ground point and the second ground point being connected to ground; and a blocking circuit disposed between the first ground point and ground, the blocking circuit having a first state and a second state, wherein in the first state, the blocking circuit conducts the path of the intermediate frequency signal between the first ground point and ground, and in the second state, the blocking circuit disconnects the path of the intermediate frequency signal between the first ground point and ground.

[0006] The blocking circuit includes: a first switching switch, the input terminal of which is connected to the first grounding point, and the first output terminal of which is connected to ground; in the first state, the input terminal of the first switching switch is disconnected from the first output terminal of the first switching switch, and in the second state, the input terminal of the first switching switch is connected to the first output terminal of the first switching switch; a first inductor, which is connected in series between the connection node of the input terminal of the first switching switch and the first grounding point and ground; and a first capacitor, which is connected in series between the first output terminal of the first switching switch and ground.

[0007] A second capacitor is connected in series between the input terminal of the first switching switch and the connection node of the first grounding point and the first grounding point, and a third capacitor is connected in series between the second grounding point and ground.

[0008] The antenna assembly further includes: a second radiating arm, a first gap being provided between the first radiating arm and the second radiating arm, a second grounding point being provided at the end of the first radiating arm near the first gap, a second feed point being provided at the end of the second radiating arm near the first gap, the second feed point being connected to an intermediate frequency signal, and a third grounding point being provided at the end of the second radiating arm away from the first gap, the third grounding point being connected to ground.

[0009] A third feed point is provided at one end of the second radiating arm near the first gap. The third feed point is located between the second feed point and the third grounding point, and the third feed point is connected to at least one high-frequency signal. The blocking circuit further includes a second inductor. The second output terminal of the first switching switch is connected to ground. The second inductor is connected in series between the second output terminal of the first switching switch and ground. In the first state, the input terminal of the first switching switch is connected to the second output terminal of the first switching switch. In the second state, the input terminal of the first switching switch is disconnected from the second output terminal of the first switching switch.

[0010] The antenna assembly further includes a third matching circuit, which is disposed on the feed path of the third feed point.

[0011] The third matching circuit includes: a ninth capacitor connected in series between the third feed point and the third feed source, the third feed source transmitting the at least one high-frequency signal; a twelfth inductor connected in parallel between the connection node of the ninth capacitor and the third feed source and the third feed point; a thirteenth inductor connected in series between the connection node of the ninth capacitor and the third feed source and ground; and a tenth capacitor connected in series between the connection node of the ninth capacitor and the third feed source and ground, the tenth capacitor being connected in parallel with the thirteenth inductor.

[0012] The antenna assembly further includes: a third radiating arm, a second gap being provided between the first radiating arm and the third radiating arm, a first feed point being provided at one end of the first radiating arm near the second gap, a fourth feed point being provided at one end of the third radiating arm near the second gap, the fourth feed point being connected to an intermediate frequency signal, and a fourth grounding point being provided at one end of the third radiating arm away from the second gap, the fourth grounding point being connected to ground.

[0013] The antenna assembly further includes a fourth matching circuit, which is disposed on the feed path of the fourth feed point.

[0014] The fourth matching circuit includes: an eleventh capacitor connected in series between the fourth feed point and the fourth feed source, the fourth feed source transmitting an intermediate frequency signal; a fourteenth inductor connected in series between the eleventh capacitor and the fourth feed source; a twelfth capacitor connected in series between the connection node of the eleventh capacitor and the fourth feed point and ground; a fifteenth inductor connected in parallel between the connection node of the eleventh capacitor and the fourth feed point and ground; and a fourth switching switch, the input terminal of which is connected in series between the eleventh capacitor and the fourth feed point, the first output terminal, the second output terminal, and the fourth output terminal of which are all connected to ground, and the third output terminal of which is connected to the connection node of the eleventh capacitor and the fourteenth inductor. Wherein, the input terminal of the fourth switch is connected to the first output terminal of the fourth switch, the input terminal of the fourth switch is connected to the second output terminal of the fourth switch, the input terminal of the fourth switch is connected to the third output terminal of the fourth switch, or the input terminal of the fourth switch is connected to the fourth output terminal of the fourth switch; the sixteenth inductor is connected in series between the first output terminal of the fourth switch and ground; the seventeenth inductor is connected in series between the second output terminal of the fourth switch and ground; the first resistor is connected in series between the third output terminal of the fourth switch and the connection node of the eleventh capacitor and the fourteenth inductor; the eighteenth inductor is connected in series between the fourth output terminal of the fourth switch and ground.

[0015] The first feed point is also connected to at least one high-frequency signal, and the antenna assembly further includes: a first matching circuit, which is disposed on the feed path of the first feed point.

[0016] The first matching circuit includes: a fourth capacitor connected in series between the first feed point and the first feed source, the first feed source transmitting the low-frequency signal or the at least one high-frequency signal; a fifth capacitor connected in series between the fourth capacitor and the first feed source; a third inductor connected in series between the fifth capacitor and the first feed source; a fourth inductor connected in series between the connection point of the fourth and fifth capacitors and ground; and a second switching switch, the input terminal of the second switching switch connected in series between the connection point of the fourth and fifth capacitors and the fourth inductor, the first output terminal, second output terminal, third output terminal, and fourth output terminal of the second switching switch being connected to ground, wherein the input of the second switching switch... The input terminal of the second switch is connected to the first output terminal of the second switch; the input terminal of the second switch is connected to the second output terminal of the second switch; the input terminal of the second switch is connected to the third output terminal of the second switch; or the input terminal of the second switch is connected to the fourth output terminal of the second switch; a fifth inductor is connected in series between the first output terminal of the second switch and ground; a sixth inductor is connected in series between the second output terminal of the second switch and ground; a sixth capacitor is connected in series between the third output terminal of the second switch and ground; a seventh inductor is connected in series between the fourth output terminal of the second switch and ground; and a seventh capacitor is connected in series between the seventh inductor and ground.

[0017] The antenna assembly further includes a second matching circuit, which is disposed on the feed path of the second feed point.

[0018] The second matching circuit includes: an eighth capacitor connected in series between the second feed point and the second feed source, the second feed source transmitting the intermediate frequency signal; an eighth inductor connected in series between the second feed point and the eighth capacitor; a ninth inductor connected in series between the second feed point and the connection node of the eighth inductor and ground; a third switching switch, the input terminal of which is connected in series between the second feed point and the connection node of the eighth inductor and the second feed point, the first and second output terminals of which are both connected to ground, wherein the input terminal of the third switching switch is connected to the first output terminal of the third switching switch or the input terminal of the third switching switch is connected to the second output terminal of the third switching switch; a tenth inductor connected in series between the first output terminal of the third switching switch and ground; and an eleventh inductor connected in series between the second output terminal of the third switching switch and ground.

[0019] A terminal device according to a second aspect of this application includes: an antenna assembly as described in the first aspect of this application; a circuit board, wherein a first grounding point and a second grounding point are both connected to the circuit board, and the circuit board is connected to ground.

[0020] The advantages of this application compared with related technologies after adopting the above technical solution are: By selectively conducting the intermediate frequency signal path through the blocking circuit, the path of the intermediate frequency clutter signal on the first radiating arm can be destroyed without affecting the transmission and reception of low frequency signals on the first radiating arm. This prevents the intermediate frequency clutter signal from forming a complete loop on the first radiating arm, thereby reducing interference between antennas and improving antenna performance. Both the first and second grounding points can be grounded through the circuit board, thus eliminating the need for a separate LDS as the SAR pattern, effectively reducing antenna costs and minimizing the increase in power back-off. This structure eliminates the need for additional gaps, ensuring the symmetry of the terminal equipment and reducing the difficulty of industrial design.

[0021] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0022] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein: Figure 1 This is a schematic diagram of the antenna assembly proposed in the relevant embodiments; Figure 2 This is an efficiency curve of the antenna assembly proposed in the relevant embodiments; Figure 3 This is a schematic diagram of the antenna assembly proposed in a relevant embodiment (direct grounding scheme). Figure 4 This is a schematic diagram of the antenna assembly proposed in a related embodiment (with a slotted design). Figure 5 This is a schematic diagram of the structure of an antenna assembly proposed in one embodiment of this application; Figure 6 This is a schematic diagram of the structure of the blocking circuit in an antenna assembly according to an embodiment of this application; Figure 7 This is a schematic diagram of the structure of the first matching circuit in an antenna assembly according to an embodiment of this application; Figure 8 This is a schematic diagram of the structure of the second matching circuit in an antenna assembly according to an embodiment of this application; Figure 9This is a schematic diagram of the structure of the third matching circuit in an antenna assembly according to an embodiment of this application; Figure 10 This is a schematic diagram of the structure of the fourth matching circuit in an antenna assembly according to an embodiment of this application; Figure 11 This is an efficiency curve of an antenna assembly proposed in one embodiment of this application; Figure 12 This is an efficiency curve of an antenna assembly proposed in one embodiment of this application; As shown in the figure: 1. First radiating arm, 2. First feed point, 3. First feed source, 4. First grounding point, 5. Second grounding point, 6. First switching switch, 7. Second radiating arm, 8. First gap, 9. Second feed point, 10. Second feed source, 11. Third grounding point, 12. Third feed point, 13. Third feed source, 14. Third radiating arm, 15. Second gap, 16. Fourth feed point, 17. Fourth feed source, 18. Fourth grounding point, 19. First matching circuit, 20. Second switching switch, 21. Second matching circuit, 22. Third switching switch, 23. Third matching circuit, 24. Fourth matching circuit, 25. Fourth switching switch. Detailed Implementation

[0023] The embodiments of this application are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application. Rather, the embodiments of this application include all variations, modifications, and equivalents falling within the spirit and scope of the appended claims.

[0024] In relevant embodiments, such as Figure 1 As shown, the antenna assembly includes a first radiating arm 1, one end of which is provided with a first feed point 2, which is connected to a low-frequency signal (Low Band, LB), and the other end of which is provided with a first ground point 4, which is connected to ground.

[0025] This enables the first radiating arm 1 to transmit and receive low-frequency signals. However, to adapt to the limited space of the terminal equipment and improve the utilization rate of the first radiating arm 1, such as... Figure 1 As shown, a second grounding point 5 is also provided on the first radiating arm 1. The second grounding point 5 is connected to the ground, and the first grounding point 4 is located between the second grounding point 5 and the first feed point 2.

[0026] The first grounding point 4 and the second grounding point 5 are both connected to the circuit board via spring contacts and grounded through the circuit board.

[0027] Thus, a parasitic branch is formed between the second grounding point 5 and the end of the first radiating arm 1 that is away from the first feed point 2. Under specific conditions, the parasitic branch can form a specific resonance at a specific wavelength, thereby radiating in a specific frequency band and realizing the transmission and reception of signals.

[0028] like Figure 1 As shown, the antenna assembly also includes a second radiating arm 7, and a first gap 8 is provided between the first radiating arm 1 and the second radiating arm 7. The second radiating arm 7 works in conjunction with the parasitic stub to enable the second radiating arm 7 to transmit and receive signals.

[0029] However, when the second radiating arm 7 operates in some intermediate frequency bands, interference noise is easily generated between the first grounding point 4 and the second grounding point 5, causing the performance of the second radiating arm 7 to degrade.

[0030] For example: when the second radiating arm 7 operates in the N7 frequency band, such as Figure 2 As shown, the first radiating arm 1 interferes with the second radiating arm 7, resulting in an efficiency dip at 2.4 GHz.

[0031] like Figure 3 As shown, some solutions connect the first grounding point 4 and the second grounding point 5 to the mid-frame of the terminal device for direct grounding. Although this method can solve the problem of performance degradation of the second radiating arm 7, it cannot make the antenna assembly a SAR (Specific Absorption Rate) sensor. Therefore, a separate LDS (Laser Direct Structuring) is required as the SAR pattern, which leads to an increase in antenna cost and an increase in power backoff.

[0032] like Figure 4 As shown, some solutions involve setting a gap between the first grounding point 4 and the second grounding point 5 of the first radiating arm 1, and connecting the second grounding point 5 to the mid-frame of the terminal device for direct grounding. Although this method can also solve the problem of performance degradation of the second radiating arm 7, the addition of the gap causes the terminal device to lose its symmetry, posing a greater challenge to industrial design (ID).

[0033] To solve the above-mentioned technical problems, such as Figure 5As shown in the embodiment of this application, an antenna assembly is proposed, including a first radiating arm 1 and a blocking circuit. One end of the first radiating arm 1 is provided with a first feed point 2, which is connected to a low-frequency signal. The other end of the first radiating arm 1 is provided with a first ground point 4 and a second ground point 5. The first ground point 4 is located between the second ground point 5 and the first feed point 2. Both the first ground point 4 and the second ground point 5 are connected to ground. The blocking circuit is disposed between the first ground point 4 and ground. The blocking circuit has a first state and a second state. In the first state, the blocking circuit conducts the path of the intermediate frequency signal between the first ground point 4 and ground. In the second state, the blocking circuit disconnects the path of the intermediate frequency signal between the first ground point 4 and ground.

[0034] It is understandable that by selectively conducting the intermediate frequency signal path through the blocking circuit, the path of the intermediate frequency clutter signal on the first radiating arm 1 can be destroyed without affecting the transmission and reception of low frequency signals on the first radiating arm 1. This prevents the intermediate frequency clutter signal from forming a complete loop on the first radiating arm 1, thereby reducing interference between antennas and improving antenna performance. Both the first grounding point 4 and the second grounding point 5 can be grounded through the circuit board, thus eliminating the need to use a separate LDS as the SAR pattern, effectively reducing antenna cost and minimizing the increase in power back-off; This structure eliminates the need for additional gaps, ensuring the symmetry of the terminal equipment and reducing the difficulty of industrial design.

[0035] like Figure 6 As shown, in some embodiments, the blocking circuit includes a first switching switch 6, a first inductor L1, and a first capacitor C1. The input terminal of the first switching switch 6 is connected to the first grounding point 4, and the first output terminal RF1 of the first switching switch 6 is connected to ground. In the first state, the input terminal of the first switching switch 6 is disconnected from the first output terminal RF1 of the first switching switch 6. In the second state, the input terminal of the first switching switch 6 is connected to the first output terminal RF1 of the first switching switch 6. The first inductor L1 is connected in series between the connection node N1 of the input terminal of the first switching switch 6 and the first grounding point 4 and ground. The first capacitor C1 is connected in series between the first output terminal RF1 of the first switching switch 6 and ground.

[0036] It is understandable that by switching the first switching switch 6, the first grounding point 4 and the first capacitor C1 are switched on and off, thereby realizing the switching of the blocking circuit between the first state and the second state. In the first state, the first grounding point 4 is grounded through the first inductor L1, and the first radiating arm 1 works normally. In the second state, the first grounding point 4 is grounded through the LC loop formed by the first inductor L1 and the first capacitor C1. The LC loop can destroy the current path of the intermediate frequency clutter signal on the first radiating arm 1, so that the intermediate frequency clutter signal cannot form a complete loop, thereby reducing the interference between antennas and improving antenna performance.

[0037] In some embodiments, the intermediate frequency signal includes the N7 band signal.

[0038] In some embodiments, the capacitance of the first capacitor C1 is 1pF and the inductance of the first inductor L1 is 2nH.

[0039] like Figure 5 , Figure 6 As shown, in some embodiments, a second capacitor C2 is connected in series between the input terminal of the first switching switch 6 and the connection node N1 of the first grounding point 4 and the first grounding point 4, and a third capacitor C3 is connected in series between the second grounding point 5 and ground.

[0040] It is understandable that by setting the second capacitor C2 and the third capacitor C3, the first grounding point 4 can be connected in series with the SAR pattern before being grounded through the circuit board, thereby reducing antenna cost and reducing the increase in power back-off.

[0041] In some embodiments, the capacitance value of the second capacitor C2 is 33pF, and the capacitance value of the third capacitor C3 is 33pF.

[0042] like Figure 5 As shown, in some embodiments, the antenna assembly further includes a second radiating arm 7, a first gap 8 is provided between the first radiating arm 1 and the second radiating arm 7, a second grounding point 5 is provided at the end of the first radiating arm 1 near the first gap 8, a second feed point 9 is provided at the end of the second radiating arm 7 near the first gap 8, the second feed point 9 is connected to the intermediate frequency signal, and a third grounding point 11 is provided at the end of the second radiating arm 7 away from the first gap 8, the third grounding point 11 is connected to ground.

[0043] It is understandable that the second radiating arm 7 is adjacent to the first radiating arm 1, and the second radiating arm 7 uses part of the first radiating arm 1 as a parasitic branch, which reduces the space occupied by the antenna assembly and effectively improves the utilization efficiency of the antenna assembly. Meanwhile, due to the setting of the blocking circuit, the second radiating arm 7 avoids efficiency loss caused by the interference of the first radiating arm 1 when operating in the intermediate frequency band, thereby improving the performance of the antenna assembly while reducing space occupation.

[0044] When the second feed point 9 is connected to the intermediate frequency signal, the blocking circuit is in the second state.

[0045] like Figure 5 , Figure 6 As shown, in some embodiments, a third feed point 12 is provided at one end of the second radiating arm 7 near the first gap 8. The third feed point 12 is located between the second feed point 9 and the third ground point 11, and the third feed point 12 is connected to at least one high-frequency signal. The blocking circuit also includes: a second inductor L2, the second output terminal RF2 of the first switch 6 is connected to ground, the second inductor L2 is connected in series between the second output terminal RF2 of the first switch 6 and ground, in the first state, the input terminal of the first switch 6 is connected to the second output terminal RF2 of the first switch 6, and in the second state, the input terminal of the first switch 6 is disconnected from the second output terminal RF2 of the first switch 6.

[0046] Understandably, the setting of the second feed point 9 enables the second radiating arm 7 to form a dual feed point structure, which can not only transmit and receive in the intermediate frequency band, but also transmit and receive in the high frequency band, effectively improving the utilization rate of the antenna components. Meanwhile, in the first state, the first inductor L1 and the second inductor L2 are connected in parallel, which not only ensures that the first radiating arm 1 can transmit and receive low-frequency signals, but also optimizes the working state of the second radiating arm 7 in the high-frequency band and improves the performance of the antenna assembly.

[0047] In some embodiments, the inductance value of the second inductor L2 is 1nH.

[0048] In some embodiments, the first switching switch 6 may be a single-pole double-throw switch.

[0049] like Figure 5 As shown, in some embodiments, the antenna assembly further includes a third matching circuit 23, which is disposed on the feed path of the third feed point 12.

[0050] It is understandable that matching and tuning through the third matching circuit 23 can effectively excite the high-frequency band, thereby improving the radiation efficiency of the second radiating arm 7.

[0051] In some embodiments, at least one high-frequency signal includes: a 5G N77 band signal and an N78 band signal.

[0052] like Figure 9 As shown, in some embodiments, the third matching circuit 23 includes a ninth capacitor C9, a twelfth inductor L12, a thirteenth inductor L13, and a tenth capacitor C10. The ninth capacitor C9 is connected in series between the third feed point 12 and the third feed source 13. The third feed source 13 transmits at least one high-frequency signal. The twelfth inductor L12 is connected in parallel between the node N2 connecting the ninth capacitor C9 and the third feed source 13 and the third feed point 12. The thirteenth inductor L13 is connected in series between the node N3 connecting the ninth capacitor C9 and the third feed source 13 and ground. The tenth capacitor C10 is connected in series between the node N4 connecting the ninth capacitor C9 and the third feed source 13 and ground. The tenth capacitor C10 and the thirteenth inductor L13 are connected in parallel.

[0053] In some embodiments, the capacitance value of the ninth capacitor C9 is 0.3pF, the capacitance value of the tenth capacitor C10 is 0.6pF, the inductance value of the twelfth inductor L12 is 8.2nH, and the inductance value of the thirteenth inductor L13 is 2.2nH.

[0054] like Figure 5 As shown, in some embodiments, the antenna assembly further includes a third radiating arm 14, a second gap 15 is provided between the first radiating arm 1 and the third radiating arm 14, a first feed point 2 is provided at the end of the first radiating arm 1 near the second gap 15, a fourth feed point 16 is provided at the end of the third radiating arm 14 near the second gap 15, the fourth feed point 16 is connected to the intermediate frequency signal, and a fourth grounding point 18 is provided at the end of the third radiating arm 14 away from the second gap 15, the fourth grounding point 18 is connected to ground.

[0055] It is understandable that the third radiating arm 14 is adjacent to the first radiating arm 1. When the third radiating arm 14 is operating in the intermediate frequency band, intermediate frequency clutter signals will also be generated between the fourth feed point 16 and the first feed point 2. By setting up the blocking circuit, the interference between antennas can be reduced and the antenna performance can be improved.

[0056] like Figure 5 As shown, in some embodiments, the antenna assembly further includes a fourth matching circuit 24, which is disposed on the feed path of the fourth feed point 16.

[0057] It is understandable that by matching and tuning through the fourth matching circuit 24, the intermediate frequency band can be effectively excited, thereby improving the radiation efficiency of the third radiating arm 14.

[0058] like Figure 10As shown, in some embodiments, the fourth matching circuit 24 includes an eleventh capacitor C11, a fourteenth inductor L14, a twelfth capacitor C12, a fifteenth inductor L15, a fourth switching switch 25, a sixteenth inductor L16, a seventeenth inductor L17, a first resistor R1, and an eighteenth inductor L18. The eleventh capacitor C11 is connected in series between the fourth feed point 16 and the fourth feed source 17, and the fourth feed source 17 transmits an intermediate frequency signal. The fourteenth inductor L14 is connected in series between the eleventh capacitor C11 and the fourth feed source 17. The twelfth capacitor C12 is connected in series between the node N5 connecting the eleventh capacitor C11 and the fourth feed point 16 and ground. The fifteenth inductor L15 is connected in parallel between the node N5 connecting the eleventh capacitor C11 and the fourth feed point 16 and ground. The input terminal of the fourth switching switch 25 is connected in series between the eleventh capacitor C11 and the fourth feed point 16. The first output terminal RF1, the second output terminal RF2, and the fourth output terminal RF4 of the fourth switching switch 25 are all connected to ground. The third output terminal RF3 of switch 25 is connected to the connection node N6 of the eleventh capacitor C11 and the fourteenth inductor L14. The input terminal of the fourth switch 25 is connected to the first output terminal RF1 of the fourth switch 25, the second output terminal RF2 of the fourth switch 25, the third output terminal RF3 of the fourth switch 25, or the fourth output terminal RF4 of the fourth switch 25. The sixteenth inductor L16 is connected in series between the first output terminal RF1 of the fourth switch 25 and ground. The seventeenth inductor L17 is connected in series between the second output terminal RF2 of the fourth switch 25 and ground. The first resistor R1 is connected in series between the third output terminal RF3 of the fourth switch 25 and the connection node N6 of the eleventh capacitor C11 and the fourteenth inductor L14. The eighteenth inductor L18 is connected in series between the fourth output terminal RF4 of the fourth switch 25 and ground.

[0059] In some embodiments, the eleventh capacitor C11 has a capacitance of 0.8pF, the twelfth capacitor C12 has a capacitance of 1pF, the fourteenth inductor L14 has an inductance of 1.5nH, the fifteenth inductor L15 has an inductance of 4.3nH, the sixteenth inductor L16 has an inductance of 1.2nH, the seventeenth inductor L17 has an inductance of 22nH, the eighteenth inductor L18 has an inductance of 4nH, and the first resistor R1 has a resistance of 0 ohms.

[0060] In some embodiments, the fourth switching switch 25 may be a single-pole four-throw switch.

[0061] like Figure 5 As shown, in some embodiments, the first feed point 2 is also connected to at least one high-frequency signal, and the antenna assembly further includes a first matching circuit 19, which is disposed on the feed path of the first feed point 2.

[0062] It is understandable that the first radiating arm 1 can transmit and receive not only low-frequency signals but also high-frequency signals, effectively improving the utilization efficiency of the antenna components. At the same time, through matching and tuning by the first matching circuit 19, it can effectively excite the low-frequency band and the high-frequency band, thereby improving the radiation efficiency of the first radiating arm 1.

[0063] like Figure 7 As shown, in some embodiments, the first matching circuit 19 includes a fourth capacitor C4, a fifth capacitor C5, a third inductor L3, a fourth inductor L4, a second switching switch 20, a fifth inductor L5, a sixth inductor L6, a sixth capacitor C6, a seventh inductor L7, and a seventh capacitor C7. The fourth capacitor C4 is connected in series between the first feed point 2 and the first feed source 3. The first feed source 3 transmits a low-frequency signal or at least one high-frequency signal. The fifth capacitor C5 is connected in series between the fourth capacitor C4 and the first feed source 3. The third inductor L3 is connected in series between the fifth capacitor C5 and the first feed source 3. The fourth inductor L4 is connected in series between the node N7 connecting the fourth capacitor C4 and the fifth capacitor C5 and ground. The input terminal of the second switching switch 20 is connected in series between the node N7 connecting the fourth capacitor C4 and the fifth capacitor C5 and the fourth inductor L4. The second switching switch 20 has a first output terminal RF1, a second output terminal RF2, and a third output terminal RF3. Both RF3 and the fourth output terminal RF4 are connected to ground. The input terminal of the second switch 20 is connected to the first output terminal RF1, the second output terminal RF2, the third output terminal RF3, or the fourth output terminal RF4. The fifth inductor L5 is connected in series between the first output terminal RF1 of the second switch 20 and ground. The sixth inductor L6 is connected in series between the second output terminal RF2 of the second switch 20 and ground. The sixth capacitor C6 is connected in series between the third output terminal RF3 of the second switch 20 and ground. The seventh inductor L7 is connected in series between the fourth output terminal RF4 of the second switch 20 and ground. The seventh capacitor C7 is connected in series between the seventh inductor L7 and ground.

[0064] In some embodiments, at least one high-frequency signal includes: a 5G N77 band signal and an N78 band signal.

[0065] In some embodiments, the capacitance of the fourth capacitor C4 is 33pF, the capacitance of the fifth capacitor C5 is 1.3pF, the capacitance of the sixth capacitor C6 is 0.4pF, the capacitance of the seventh capacitor C7 is 0.8pF, the inductance of the third inductor L3 is 3nH, the inductance of the fourth inductor L4 is 51nH, the inductance of the fifth inductor L5 is 68nH, the inductance of the sixth inductor L6 is 30nH, and the inductance of the seventh inductor L7 is 18nH.

[0066] In some embodiments, the second switching switch 20 may be a single-pole four-throw switch.

[0067] like Figure 5 As shown, in some embodiments, the antenna assembly further includes a second matching circuit 21, which is disposed on the feed path of the second feed point 9.

[0068] It is understandable that by matching and tuning through the second matching circuit 21, the intermediate frequency band can be effectively excited, thereby improving the radiation efficiency of the second radiating arm 7.

[0069] like Figure 8 As shown, in some embodiments, the second matching circuit 21 includes an eighth capacitor C8, an eighth inductor L8, a ninth inductor L9, a third switching switch 22, a tenth inductor L10, and an eleventh inductor L11. The eighth capacitor C8 is connected in series between the second feed point 9 and the second feed source 10, which transmits an intermediate frequency signal. The eighth inductor L8 is connected in series between the second feed point 9 and the eighth capacitor C8. The ninth inductor L9 is connected in series between the second feed point 9 and the node N8 connecting the eighth inductor L8 and ground. The input terminal of the third switching switch 22 is connected in series between the second feed point 9 and the eleventh inductor L11. Between the connection node N8 of the eight inductors L8 and the second feed point 9, the first output terminal RF1 and the second output terminal RF2 of the third switch 22 are both connected to ground. The input terminal of the third switch 22 is connected to the first output terminal RF1 of the third switch 22 or the input terminal of the third switch 22 is connected to the second output terminal RF2 of the third switch 22. The tenth inductor L10 is connected in series between the first output terminal RF1 of the third switch 22 and ground, and the eleventh inductor L11 is connected in series between the second output terminal RF2 of the third switch 22 and ground.

[0070] In some embodiments, the capacitance of the eighth capacitor C8 is 0.8pF, the inductance of the eighth inductor L8 is 4.7nH, the inductance of the ninth inductor L9 is 4.5nH, the inductance of the tenth inductor L10 is 5.6nH, and the inductance of the eleventh inductor L11 is 1.9nH.

[0071] In some embodiments, the third switching switch 22 may be a single-pole double-throw switch.

[0072] Based on the antenna components described above, such as Figure 11 , Figure 12 As shown, when the second radiating arm 7 operates in the N7 frequency band and the blocking circuit is in the first state, the input terminal of the first switching switch 6 and the first output terminal RF1 of the first switching switch 6 are not connected. At this time, the efficiency of the N7 frequency band is significantly reduced. When the second radiating arm 7 operates in the N7 frequency band and the blocking circuit is in the second state, the input terminal of the first switching switch 6 is connected to the first output terminal RF1 of the first switching switch 6. At this time, the efficiency of the N7 frequency band is effectively improved.

[0073] Therefore, it can be seen that when the second radiating arm 7 operates in the N7 frequency band and the blocking circuit is in the second state, the problem of efficiency loss of the second radiating arm 7 is effectively solved.

[0074] This application also proposes a terminal device, including the antenna assembly and circuit board described above, wherein the first grounding point 4 and the second grounding point 5 are both connected to the circuit board, and the circuit board is connected to ground.

[0075] It is understandable that by selectively conducting the intermediate frequency signal path through the blocking circuit, the path of the intermediate frequency clutter signal on the first radiating arm 1 can be destroyed without affecting the transmission and reception of low frequency signals on the first radiating arm 1. This prevents the intermediate frequency clutter signal from forming a complete loop on the first radiating arm 1, thereby reducing interference between antennas and improving antenna performance. Both the first grounding point 4 and the second grounding point 5 are grounded through the circuit board, thus eliminating the need to use a separate LDS as the SAR pattern, effectively reducing antenna cost and decreasing the increase in power back-off; This structure eliminates the need for additional gaps, ensuring the symmetry of the terminal equipment and reducing the difficulty of industrial design.

[0076] In some embodiments, both the first grounding point 4 and the second grounding point 5 are connected to the circuit board via spring contacts.

[0077] In some embodiments, the terminal device may be a mobile phone, tablet computer, smartwatch, etc.

[0078] In some embodiments, the first radiating arm 1 is disposed at the corner where the top surface and the side surface of the terminal device are connected, and the first radiating arm 1 is distributed in an L-shape; the second radiating arm 7 is disposed on the top surface of the terminal device, and the second radiating arm 7 is distributed in a straight line; and the third radiating arm 14 is disposed on the side surface of the terminal device, and the third radiating arm 14 is distributed in a straight line.

[0079] It should be noted that in the description of this application, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Furthermore, in the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0080] Any process or method described in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or more executable instructions for implementing a particular logical function or process, and the scope of the preferred embodiments of this application includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order depending on the function involved, as will be understood by those skilled in the art to which embodiments of this application pertain.

[0081] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0082] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. An antenna assembly, characterized in that, include: A first radiating arm, one end of which is provided with a first feed point, which is connected to a low-frequency signal; the other end of which is provided with a first ground point and a second ground point, the first ground point being located between the second ground point and the first feed point, and both the first ground point and the second ground point being connected to ground. An isolation circuit is disposed between the first grounding point and ground. The isolation circuit has a first state and a second state. In the first state, the isolation circuit conducts the path of the intermediate frequency signal between the first grounding point and ground. In the second state, the isolation circuit disconnects the path of the intermediate frequency signal between the first grounding point and ground. The blocking circuit includes a first switching switch, a first inductor, and a first capacitor. The input terminal of the first switching switch is connected to the first grounding point, and the first output terminal of the first switching switch is connected to ground. In the first state, the input terminal of the first switching switch is disconnected from the first output terminal of the first switching switch. In the second state, the input terminal of the first switching switch is connected to the first output terminal of the first switching switch. The first inductor is connected in series between the connection node of the input terminal of the first switching switch and the first grounding point and ground. The first capacitor is connected in series between the first output terminal of the first switching switch and ground.

2. The antenna assembly according to claim 1, characterized in that, A second capacitor is connected in series between the input terminal of the first switching switch and the connection node of the first grounding point and the first grounding point, and a third capacitor is connected in series between the second grounding point and ground.

3. The antenna assembly according to claim 1, characterized in that, The antenna assembly also includes: The second radiating arm has a first gap between it and the first radiating arm. The second grounding point is located at the end of the first radiating arm near the first gap. The end of the second radiating arm near the first gap has a second feed point connected to the intermediate frequency signal. The end of the second radiating arm away from the first gap has a third grounding point connected to the ground.

4. The antenna assembly according to claim 3, characterized in that, A third feed point is provided at one end of the second radiating arm near the first gap. The third feed point is located between the second feed point and the third grounding point. The third feed point is connected to at least one high-frequency signal. The blocking circuit further includes a second inductor, wherein the second output terminal of the first switch is connected to ground, and the second inductor is connected in series between the second output terminal of the first switch and ground. In the first state, the input terminal of the first switch is connected to the second output terminal of the first switch, and in the second state, the input terminal of the first switch is disconnected from the second output terminal of the first switch.

5. The antenna assembly according to claim 4, characterized in that, The antenna assembly further includes a third matching circuit, which is disposed on the feed path of the third feed point.

6. The antenna assembly according to claim 5, characterized in that, The third matching circuit includes: The ninth capacitor is connected in series between the third feed point and the third feed source, and the third feed source transmits the at least one high-frequency signal; The twelfth inductor is connected in parallel between the node connecting the ninth capacitor and the third feed source and the third feed point; The thirteenth inductor is connected in series between the node connecting the ninth capacitor and the third feed source and ground; The tenth capacitor is connected in series between the connection node of the ninth capacitor and the third feed source and ground, and the tenth capacitor is connected in parallel with the thirteenth inductor.

7. The antenna assembly according to claim 3, characterized in that, The antenna assembly further includes a second matching circuit, which is disposed on the feed path of the second feed point.

8. The antenna assembly according to claim 7, characterized in that, The second matching circuit includes: The eighth capacitor is connected in series between the second feed point and the second feed source, and the second feed source transmits the intermediate frequency signal; The eighth inductor is connected in series between the second feed point and the eighth capacitor; The ninth inductor is connected in series between the second feed point and the connection node of the eighth inductor and ground; The third switching switch has its input terminal connected in series between the second feed point and the connection node of the eighth inductor and the second feed point. The first and second output terminals of the third switching switch are both connected to ground. The input terminal of the third switching switch is connected to the first output terminal of the third switching switch or the input terminal of the third switching switch is connected to the second output terminal of the third switching switch. The tenth inductor is connected in series between the first output terminal of the third switching switch and ground; The eleventh inductor is connected in series between the second output terminal of the third switching switch and ground.

9. The antenna assembly according to claim 1, characterized in that, The antenna assembly also includes: The third radiating arm has a second gap between the first radiating arm and the third radiating arm. The first feed point is located at the end of the first radiating arm near the second gap. The third radiating arm has a fourth feed point at the end near the second gap, which is connected to the intermediate frequency signal. The third radiating arm has a fourth grounding point at the end away from the second gap, which is connected to the ground.

10. The antenna assembly according to claim 9, characterized in that, The antenna assembly further includes a fourth matching circuit, which is disposed on the feed path of the fourth feed point.

11. The antenna assembly according to claim 10, characterized in that, The fourth matching circuit includes: The eleventh capacitor is connected in series between the fourth feed point and the fourth feed source, and the fourth feed source transmits an intermediate frequency signal. The fourteenth inductor is connected in series between the eleventh capacitor and the fourth feed source; The twelfth capacitor is connected in series between the node connecting the eleventh capacitor and the fourth feed point and ground; The fifteenth inductor is connected in parallel between the node connecting the eleventh capacitor and the fourth feed point and ground; A fourth switching switch, the input terminal of which is connected in series between the eleventh capacitor and the fourth feed point, the first, second, and fourth output terminals of which are all connected to ground, and the third output terminal of which is connected to the connection node of the eleventh capacitor and the fourteenth inductor, wherein the input terminal of the fourth switching switch is connected to the first output terminal of the fourth switching switch, the input terminal of the fourth switching switch is connected to the second output terminal of the fourth switching switch, the input terminal of the fourth switching switch is connected to the third output terminal of the fourth switching switch, or the input terminal of the fourth switching switch is connected to the fourth output terminal of the fourth switching switch. The sixteenth inductor is connected in series between the first output terminal of the fourth switching switch and ground; The seventeenth inductor is connected in series between the second output terminal of the fourth switching switch and ground; The first resistor is connected in series between the third output terminal of the fourth switching switch and the connection node of the eleventh capacitor and the fourteenth inductor. The eighteenth inductor is connected in series between the fourth output terminal of the fourth switching switch and ground.

12. The antenna assembly according to claim 1, characterized in that, The first feed point is also connected to at least one high-frequency signal, and the antenna assembly further includes: a first matching circuit, which is disposed on the feed path of the first feed point.

13. The antenna assembly according to claim 12, characterized in that, The first matching circuit includes: A fourth capacitor is connected in series between the first feed point and the first feed source, and the first feed source transmits the low-frequency signal or the at least one high-frequency signal. The fifth capacitor is connected in series between the fourth capacitor and the first feed source; The third inductor is connected in series between the fifth capacitor and the first feed source; The fourth inductor is connected in series between the connection node of the fourth capacitor and the fifth capacitor and ground; The second switch has its input terminal connected in series between the connection node of the fourth capacitor and the fifth capacitor and the fourth inductor. The first, second, third, and fourth output terminals of the second switch are all connected to ground. The input terminal of the second switch is connected to the first output terminal of the second switch, the second output terminal of the second switch, the third output terminal of the second switch, or the fourth output terminal of the second switch. The fifth inductor is connected in series between the first output terminal of the second switching switch and ground; The sixth inductor is connected in series between the second output terminal of the second switching switch and ground; The sixth capacitor is connected in series between the third output terminal of the second switching switch and ground; The seventh inductor is connected in series between the fourth output terminal of the second switching switch and ground; The seventh capacitor is connected in series between the seventh inductor and ground.

14. A terminal device, characterized in that, include: The antenna assembly as described in any one of claims 1-13; The circuit board has both the first grounding point and the second grounding point connected to it, and the circuit board is connected to ground.

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