Antenna assemblies and electronic devices

Abstract

This application provides an antenna assembly and electronic device. The antenna assembly includes an antenna radiator, a SAR sensor, and an isolation circuit. The SAR sensor detects the capacitance between the antenna radiator and a user. The isolation circuit is disposed between the SAR sensor and the antenna radiator, and the isolation circuit is configured such that the frequency corresponding to the peak value of the isolation circuit's VSWR matches at least one operating frequency band of the antenna radiator. The antenna assembly provided by this application improves antenna efficiency by enhancing the isolation effect of the isolation circuit, reducing interference from the SAR sensor to the antenna radiator, and improving antenna efficiency.

Description

Technical Field

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

[0002] With the widespread use of Specific Absorption Rate Sensors (SAR sensors) in mobile terminals such as smartphones, the interference of SAR sensors on the antennas of these terminals has become increasingly apparent. To reduce this interference, related technologies often employ an isolation circuit between the antenna radiator and the SAR sensor. However, the isolation effect of such circuits is not ideal and cannot effectively reduce the interference from the SAR sensor to the antenna radiator, thus affecting antenna efficiency. Summary of the Invention

[0003] This application provides an antenna assembly and electronic device to improve the isolation effect of the isolation circuit in the antenna assembly, reduce the interference of the SAR sensor to the antenna radiator, and improve the antenna efficiency.

[0004] According to some embodiments, this application provides an antenna assembly, including:

[0005] Antenna radiator;

[0006] SAR sensor, used to detect the capacitance between the antenna radiator and the user;

[0007] An isolation circuit is disposed between the SAR sensor and the antenna radiator, the isolation circuit being configured such that the frequency corresponding to the peak value of the isolation circuit's standing wave ratio matches at least one operating frequency band of the antenna radiator.

[0008] In some embodiments, the isolation circuit includes at least one isolation unit, each isolation unit having a standing wave ratio peak value, and the frequency corresponding to the standing wave ratio peak value of each isolation unit being matched with at least one of the operating frequency bands;

[0009] When the isolation circuit includes multiple isolation units, the isolation units are connected in series.

[0010] In some embodiments, the isolation circuit includes a plurality of the isolation units, and the antenna radiator has a plurality of the operating frequency bands;

[0011] Each of the isolation units corresponds one-to-one with a number of operating frequency bands, and the frequency corresponding to the peak VSWR of each isolation unit matches the operating frequency band corresponding to that isolation unit; or,

[0012] Each isolation unit corresponds to at least two of the plurality of operating frequency bands, and the frequency corresponding to the peak value of the standing wave ratio of each isolation unit matches one or at least two operating frequencies corresponding to that isolation unit.

[0013] In some embodiments, when each isolation unit corresponds to a working frequency band, the frequency corresponding to the peak value of the standing wave ratio of the isolation unit falls within the working frequency band corresponding to that isolation unit;

[0014] When each isolation unit corresponds to at least two operating frequency bands, the frequency corresponding to the peak value of the VSWR of the isolation unit falls between the maximum and minimum frequency values ​​of the at least two operating frequency bands corresponding to the isolation unit.

[0015] In some embodiments, the antenna has at least one frequency type;

[0016] The operating frequency bands belonging to the same frequency type all correspond to one isolation unit.

[0017] In some embodiments, the frequency type includes at least one of low frequency, medium frequency, and high frequency.

[0018] In some embodiments, when the isolation circuit includes a plurality of isolation units, the circuit structures of each isolation unit are the same, or at least two of the isolation units have different circuit structures.

[0019] In some embodiments, the isolation unit has an input terminal connected to the SAR sensor and an output terminal connected to the antenna radiator, the isolation unit comprising:

[0020] A first inductor, a first resistor, and a first capacitor are disposed between the input and output terminals of the isolation unit, wherein the first inductor and the first resistor are connected in series, and the first capacitor is connected in parallel with the first inductor and the first resistor connected in series; or,

[0021] A second inductor, a second resistor, a second capacitor, and a third capacitor are disposed between the input and output terminals of the isolation unit. The third capacitor is connected in series with the second resistor. The second inductor is connected in parallel with the third capacitor and the second resistor connected in series. The second capacitor is connected in series with the second inductor, the third capacitor, and the second resistor connected in parallel. Alternatively,

[0022] A third inductor, a fourth capacitor, and a fifth capacitor are disposed between the input and output terminals of the isolation unit. The third inductor and the fifth capacitor are connected in series, and the fourth capacitor is connected in parallel with the third inductor and the fifth capacitor connected in series.

[0023] In some embodiments, the output of the isolation circuit is connected to the feed point of the antenna radiator, and the input of the isolation circuit is connected to the SAR sensor.

[0024] In some embodiments, the antenna assembly further includes an antenna matching circuit, one end of which is connected to the feed point of the antenna radiator, and the other end of which is connected to a signal source; and / or,

[0025] The antenna assembly also includes a grounding capacitor, one end of which is connected to the grounding point of the antenna radiator, and the other end of which is grounded.

[0026] According to some embodiments, this application also provides an electronic device that includes the antenna assembly described in the above embodiments.

[0027] In the antenna assembly provided in this application, an isolation circuit is provided between the antenna radiator and the SAR sensor. The frequency corresponding to the peak value of the VSWR of the isolation circuit matches the operating frequency band of the antenna radiator, so that the isolation circuit has the maximum VSWR in these operating frequency bands, thereby improving the isolation effect of the isolation circuit, reducing the interference of the SAR sensor to the antenna radiator, and thus improving the antenna efficiency. Attached Figure Description

[0028] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0029] Figure 1 An example diagram of an antenna assembly provided in an embodiment of this application.

[0030] Figure 2 for Figure 1 An exemplary example diagram of a medium isolation circuit.

[0031] Figure 3 for Figure 2 An example diagram of an isolation circuit in which the isolation unit is an inductor circuit.

[0032] Figure 4 for Figure 2 An example diagram of a T-type isolation unit included in a medium isolation circuit.

[0033] Figure 5 for Figure 2 An example diagram of a π-type isolation circuit included in a medium isolation circuit.

[0034] Figure 6 The diagram shows the standing wave ratio (SWR) curve of a simulated isolation circuit including one isolation unit, as shown in the embodiments of this application.

[0035] Figure 7 The diagram shows the standing wave ratio (SWR) curves of a simulated isolation circuit including two isolation units, as shown in the embodiments of this application.

[0036] Figure 8 The diagram shows the standing wave ratio (SWR) curves of a simulated isolation circuit comprising three isolation units, as described in this application embodiment.

[0037] Figure 9 This is a comparison graph showing the antenna efficiency and reflection coefficient of the simulated isolation circuit under two different inductance values ​​according to an embodiment of this application.

[0038] Explanation of reference numerals in the attached figures:

[0039] 10 - Antenna radiator; 20 - SAR sensor;

[0040] 30 - Isolation circuit; 31 - Isolation unit;

[0041] 310 - First inductor; 311 - First resistor;

[0042] 312 - First capacitor, 320 - Second inductor;

[0043] 321 - Second resistor, 322 - Second capacitor;

[0044] 323 - Third capacitor, 330 - Third inductor;

[0045] 331 - Fourth capacitor, 332 - Fifth capacitor;

[0046] 40 - Grounding capacitor; 50 - Antenna matching circuit;

[0047] 60 - Signal source. Detailed Implementation

[0048] In related technologies, a single inductor is typically used as an isolation circuit between the antenna radiator and the SAR sensor. The design principle for this isolation circuit is that the larger the inductance, the better. However, the isolation effect of this type of circuit is not ideal and cannot effectively reduce the interference of the SAR sensor on the antenna radiator. The inventors of this application have discovered that the isolation effect of the isolation circuit is related to its standing wave ratio (SWR); the higher the SWR, the better the isolation effect. However, in related technologies, although the inductors used in the isolation circuits are becoming increasingly larger, the equivalent circuit of the inductor is generally not an ideal equivalent circuit, but rather a non-ideal equivalent circuit including loss resistance and distributed capacitance. This causes the SWR of the isolation circuit to not increase with the increase of the inductance, resulting in the isolation circuit's inability to effectively isolate the interference signal from the SAR sensor, and consequently, its inability to effectively reduce the interference of the SAR sensor on the antenna radiator.

[0049] In view of this, embodiments of this application provide an antenna assembly that matches the frequency corresponding to the peak value of the VSWR of the isolation circuit with the operating frequency band of the antenna radiator, so that the isolation circuit has the maximum VSWR in these operating frequency bands, thereby effectively reducing the interference of the SAR sensor on the antenna radiator and improving the antenna efficiency.

[0050] The technical solutions of this application and how they solve the aforementioned technical problems are described in detail below with specific embodiments. These embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of this application will be described below with reference to the accompanying drawings.

[0051] This application provides an antenna assembly that can be applied to electronic devices, such as... Figure 1 As shown, the antenna assembly includes an antenna radiator 10, a SAR sensor 20, and an isolation circuit 30. The antenna radiator 10 can be a radiator of a floating antenna or a patch antenna. As an example, the antenna radiator 10 is a radiator of a floating antenna. The radiator of the floating antenna can form a detection capacitance with the human body, that is, the radiator of the floating antenna acts as a sensing plate (PAD) or electrode of the detection capacitance.

[0052] The SAR sensor 20 is connected to the antenna radiator 10 and is used to detect the capacitance value between the antenna radiator 10 and the user. Based on the capacitance value, the radiated power of the antenna radiator 10 is reduced to decrease the electromagnetic wave absorption rate (SAR) of the electronic device, thereby providing safety assurance for the user's use of the electronic device.

[0053] An isolation circuit 30 is disposed between the SAR sensor 20 and the antenna radiator 10. In some embodiments, the isolation circuit 30 is connected in series between the SAR sensor 20 and the antenna radiator 10. The isolation circuit 30 is used to isolate interference signals output by the proximity sensor 20 to the antenna 10. The interference signals can be, for example, current signals. The isolation circuit 30 is configured such that the frequency corresponding to the peak value of the standing wave ratio (VSWR) of the isolation circuit 30 matches at least one operating frequency band of the antenna radiator 10, so that the isolation circuit 30 has the maximum VSWR in the operating frequency band of the antenna radiator 10, thereby improving the isolation effect of the isolation circuit 30 and reducing the interference of the SAR sensor 20 to the antenna radiator 10.

[0054] In this embodiment, by matching the frequency corresponding to the peak value of the VSWR of the isolation circuit 30 with the operating frequency band of the antenna radiator 10, the isolation circuit 30 has the maximum VSWR when the antenna radiator 10 operates in its operating frequency band, thereby improving the isolation effect of the isolation circuit 30, reducing the interference of the SAR sensor 20 to the antenna radiator 10, and thus improving the antenna efficiency.

[0055] As an example, such as Figure 2 As shown, the isolation circuit 30 includes at least one isolation unit 31, each isolation unit 31 having a standing wave ratio peak value, and the frequency corresponding to the standing wave ratio peak value of each isolation unit 31 is matched with at least one operating frequency band of the antenna radiator 10; and when the isolation circuit 30 includes multiple isolation units 31, the isolation units 31 are connected in series.

[0056] In other words, the isolation circuit 30 may include one isolation unit 31, or two or more isolation units 31. When the isolation circuit includes multiple isolation units 31, these isolation units 31 are connected in series. Figure 2 In the example, the isolation circuit 30 includes three isolation units, and the three isolation units 31 are connected in series.

[0057] As an example, when the isolation circuit 30 includes multiple isolation units and the antenna radiator 10 has multiple operating frequency bands, the multiple isolation units 31 correspond one-to-one with the multiple operating frequency bands of the antenna radiator 10, and the frequency corresponding to the peak VSWR of each isolation unit 31 matches the operating frequency band corresponding to that isolation unit 31. That is, in this example, each operating frequency band of the antenna radiator 10 is matched with one isolation unit 31, and the frequency corresponding to the peak VSWR of each isolation unit 31 falls within the operating frequency band corresponding to that isolation unit. This design ensures that when the antenna radiator 10 operates in each frequency band, there is an isolation unit 31 with the maximum VSWR to isolate the interference signal from the SAR sensor 20 to the antenna radiator 10, reducing the interference from the SAR sensor 20 to the antenna radiator 10, thereby improving antenna efficiency.

[0058] As another example, when the isolation circuit 30 includes multiple isolation units 31 and the antenna radiator 10 has multiple operating frequency bands, each isolation unit 31 corresponds to at least two of the multiple operating frequency bands of the antenna radiator 10, and the frequency corresponding to the peak VSWR of each isolation unit 31 matches one or more of the operating frequency bands corresponding to that isolation unit 31. That is, in this example, each isolation unit 31 can correspond to two or more operating frequency bands, and the frequency corresponding to the peak VSWR of each isolation unit 31 falls between the maximum and minimum frequency values ​​among the at least two operating frequency bands corresponding to that isolation unit. It should be noted that the maximum frequency value is the highest frequency value among all operating frequency bands corresponding to that isolation unit 31, and the minimum frequency value is the lowest frequency value among all operating frequency bands corresponding to that isolation unit 31. All operating frequency bands corresponding to that isolation unit 31 are between the maximum and minimum frequency values.

[0059] The isolation circuit 30 is determined in relation to the operating frequency band of the antenna radiator 10. The operating frequency band of the antenna radiator 10 generally includes the frequency bands under second-generation 2G wireless communication, third-generation 3G wireless communication, fourth-generation 4G wireless communication, and / or fifth-generation 5G wireless communication. Examples are shown in Table 1.

[0060]

[0061] As shown in Table 1, the antenna radiator 10 can have multiple operating frequency bands, which can be divided into three frequency types: low frequency, intermediate frequency, and high frequency. Different antenna radiators 10 may operate in only one of these frequency types. For example, all operating frequency bands of the antenna radiator 10 may belong only to the high frequency type; or all operating frequency bands may belong to both low and intermediate frequency types; or all operating frequency bands may belong to all three frequency types: low, intermediate, and high. In other words, the antenna radiator 10 has at least one frequency type, and each frequency type can include at least one or all operating frequency bands of the antenna radiator 10.

[0062] In some embodiments, the number and size (e.g., inductance value) of the isolation units 31 included in the isolation circuit 30 are determined according to the frequency type to which the operating frequency band of the antenna radiator 10 belongs. Each operating frequency band belonging to the same frequency type corresponds to one isolation unit 31; that is, each operating frequency band belonging to the same frequency type is matched with one isolation unit 31. For example, if all operating frequency bands of the antenna radiator 10 belong to the intermediate frequency (IF) frequency type, then the isolation circuit 30 can be determined to include one isolation unit 31. As another example, if all operating frequency bands of the antenna radiator 10 belong to both IF and high frequency types, then the isolation circuit 30 can be determined to include two isolation units 31. Furthermore, if all operating frequency bands of the antenna radiator 10 belong to low frequency, IF, and high frequency types, then the isolation circuit 30 can be determined to include three isolation units 31.

[0063] It should be noted that the isolation circuit 30 has an output terminal and an input terminal. The input terminal of the isolation circuit 30 is connected to the SAR sensor 20, and the output terminal of the isolation circuit 30 is connected to the feed point of the antenna radiator 10. The isolation unit 31 has an input terminal and an output terminal. When the isolation circuit 30 includes two or more isolation units 31, these isolation units 31 are connected in series. After being connected in series, the input terminal of the isolation unit 31 forms the input terminal of the isolation circuit 30 and is connected to the SAR sensor 20; the output terminal of the isolation unit 31 forms the output terminal of the isolation circuit 30 and is connected to the antenna radiator 10.

[0064] In some embodiments, the isolation unit 31 can be an inductor circuit, a T-type circuit, or a π-type circuit, which will be described below with examples.

[0065] like Figure 3 As shown, the isolation unit 31 is an inductor circuit. This inductor circuit includes a first inductor 310, a first resistor 311, and a first capacitor 312 disposed between the input and output terminals of the isolation unit 31. The first inductor 310 and the first resistor 311 are connected in series, and the first capacitor 312 is connected in parallel with the series-connected first inductor 310 and first resistor 311. It should be noted that the first resistor 311 is the resistance generated by the first inductor 310 when it is obstructed during current conduction, and the first capacitor 312 is the capacitance generated between adjacent coils of the first inductor 310.

[0066] The standing wave ratio (SWR) of the aforementioned inductor circuit satisfies the following formula: SWR = R / r, where SWR is the SWR of the inductor circuit, R is the output impedance of the inductor circuit, and r is the input impedance of the inductor circuit. From this formula, it can be seen that when the input impedance r of the inductor circuit remains constant, the larger the output impedance R of the inductor circuit, the larger the SWR of the inductor circuit.

[0067] It should be noted that the Standing Wave Ratio (SWR) is a measure of the impedance matching between the load and the characteristic impedance matching of the transmission line or waveguide. The SWR is defined as the ratio of the amplitude of the standing wave at the antinodes (maximum value) to the amplitude at the nodes (minimum value) of the transmission line. A higher SWR indicates better isolation performance of the isolation circuit 30.

[0068] like Figure 4 As shown, the isolation unit 31 is a T-type circuit. The T-type circuit includes a second inductor 320, a second resistor 321, a second capacitor 322, and a third capacitor 323 disposed between the input and output terminals of the isolation unit 31. The third capacitor 323 is connected in series with the second resistor 321, and the second inductor 320 is connected in parallel with the second capacitor 323 and the second resistor 321. The second capacitor 322 is connected in series with the second inductor 320, the second resistor 321, and the third capacitor 323.

[0069] In other embodiments, such as Figure 5 As shown, the isolation unit 31 is a π-type circuit. The π-type circuit includes a third inductor 330, a fourth capacitor 331, and a fifth capacitor 332 disposed between the input and output terminals of the isolation unit 31. The third inductor 330 and the fifth capacitor 332 are connected in series, and the fourth capacitor 331 is connected in parallel with the third inductor 330 and the fifth capacitor 332 connected in series.

[0070] When the isolation circuit 30 includes multiple isolation units 31, the circuit structure of each isolation unit 31 can be the same, or at least two isolation units 31 can have different circuit structures. That is, when the isolation circuit 30 includes multiple isolation units 31, each isolation unit 31 can be entirely an inductor circuit, or entirely a T-type circuit, or entirely a π-type circuit; alternatively, some isolation units 31 can be inductor circuits, and other isolation units 31 can be T-type circuits and / or π-type circuits, depending on the requirements.

[0071] In the above embodiments, the frequency corresponding to the peak value of the standing wave ratio (SWR) of the isolation unit 31 can be obtained through simulation software. For example, the curve of the SWR of each isolation unit 31 changing with frequency can be obtained through simulation first. Then, based on the curve, the SWR corresponding to different frequencies, the peak value of the SWR of the isolation unit 31, and the frequency corresponding to the peak value of the SWR can be obtained. The following simulation and explanation are based on the example of the isolation unit 31 being an inductor circuit.

[0072] In some embodiments, such as Figure 6As shown, an inductor circuit with an inductance value of 180nH is used as an example. First, a first model TS of the inductor circuit is established in the simulation software. The first model TS has an input terminal 1 and an output terminal 2, and the impedance of both input terminal 1 and output terminal 2 of the first model TS is 50 ohms. Then, the first model TS is simulated at a frequency of 0-20GHz to generate a simulated curve of the standing wave ratio (VSWR) of the inductor circuit as a function of frequency. Figure 6 The simulation curves of the standing wave ratio (SWR) of the inductor circuit as a function of frequency in the range of 0-20 GHz are shown. The simulation curves show that the SWR of the inductor circuit changes with frequency, and the inductor circuit has a peak SWR at a frequency of 0.8 GHz.

[0073] in addition, Figure 6 It is also shown that the inductor circuit has a peak VSWR of 115.9 at a frequency of 0-20 GHz, and the frequency corresponding to the peak VSWR is 0.8 GHz, that is, the coordinates of the peak VSWR of the inductor circuit are (0.8, 115.9).

[0074] In other embodiments, such as Figure 7 As shown, two inductor circuits with inductance values ​​of 180nH and 36nH are used as examples. First, a first model TS for each of the two inductor circuits is created in the simulation software. Then, the two first models TS are connected in series to form a second model. The second model has an input terminal 1 and an output terminal 2, and the impedance of both input terminal 1 and output terminal 2 is 50 ohms. Next, the second model is simulated at a frequency of 0-20GHz, generating a simulated curve of the second model's standing wave ratio (VSWR) as a function of frequency. The simulation curve shows that, in the frequency range of 0-20 GHz, the standing wave ratio (SWR) of two series-connected inductor circuits varies with frequency. These two series-connected inductor circuits have two SWR peak values ​​of 118.3 and 195.3 at 0.7 GHz and 2.7 GHz, respectively. The SWR peak value at 0.7 GHz corresponds to the inductor circuit with an inductance of 180 nH, and the SWR peak value at 2.7 GHz corresponds to the inductor circuit with an inductance of 36 nH. In other words, the coordinates of the SWR peak value of the inductor circuit with an inductance of 180 nH are (0.7, 118.3), and the coordinates of the SWR peak value of the inductor circuit with an inductance of 100 nH are (2.7, 195.3).

[0075] As another example, such as Figure 8As shown, three inductor circuits with inductance values ​​of 180nH, 36nH, and 13nH are used as examples. First, a first model TS for each of the three inductor circuits is created in the simulation software. Then, the three first models TS are connected in series to form a second model. The second model has an input terminal 1 and an output terminal 2, both of which have an impedance of 50 ohms. Next, the second model is simulated at a frequency of 0-20GHz, generating a simulated curve of the second model's standing wave ratio (VSWR) as a function of frequency. Figure 8 The graph shows the VSWR (Standing Wave Ratio) of three series-connected inductor circuits in the frequency range of 0-20 GHz. The VSWR of the three series-connected inductor circuits varies with frequency, and these three series-connected inductor circuits have three VSWR peak values ​​of 121.9, 178.9, and 215.9 at 0.7 GHz, 2.4 GHz, and 4.9 GHz, respectively. Specifically, the VSWR peak value at 0.7 GHz corresponds to an inductor circuit with an inductance of 180 nH, with coordinates (0.7, 121.9); the VSWR peak value at 2.4 GHz corresponds to an inductor circuit with an inductance of 36 nH, with coordinates (2.4, 178.9); and the VSWR peak value at 4.9 GHz corresponds to an inductor circuit with an inductance of 13 nH, with coordinates (4.9, 215.9).

[0076] Furthermore, when the isolation unit 31 included in the isolation circuit 30 of the antenna assembly is an inductor circuit, the antenna efficiency and reflection coefficient S11 are different under different inductance values. For example, as... Figure 9 As shown, Figure 9 Simulations are shown for inductor circuits with inductance values ​​of 180nH and 100nH, respectively. Curve a represents the antenna efficiency curve for the 100nH inductor circuit, and curve b represents the antenna efficiency curve for the 180nH inductor circuit. These two antenna efficiency curves show that the isolation circuit using an inductor with an inductance value of 180nH exhibits a larger VSWR in the B28 band compared to the circuit using an inductor with an inductance value of 100nH, thus resulting in higher antenna efficiency.

[0077] Figure 9 Curves c and d in the diagram represent the reflection coefficient S11 of inductor circuits with inductance values ​​of 180nH and 100nH, respectively. Curve c is the curve for the reflection coefficient S11 of the 100nH inductor circuit, and curve d is the curve for the reflection coefficient S11 of the 180nH inductor circuit. Figure 9 It can be seen that in the B28 frequency band, the return loss of the inductor circuit with an inductance value of 180nH is small. Therefore, compared with the inductor circuit with an inductance value of 100nH, the sideband efficiency of the inductor circuit with an inductance value of 180nH is improved by 0.72dB.

[0078] It should be noted that the reflection coefficient S11 = Pr / Pin, where Pr is the reflected power and Pin is the incident power.

[0079] In some embodiments, continue to refer to Figure 1 The antenna assembly also includes an antenna matching circuit 50, one end of which is connected to the feed point of the antenna radiator 10, and the other end is connected to the signal source 60. This design allows for impedance matching of the signal received by the antenna radiator 10, improving antenna efficiency.

[0080] In other embodiments, reference continues. Figure 1 The antenna assembly also includes a grounding capacitor 40, one end of which is connected to the grounding point of the antenna radiator 10, and the other end of which is grounded. This design uses the grounding capacitor 40 to filter out interference signals and improve antenna efficiency.

[0081] This application also provides an electronic device that includes the antenna assembly described in the above embodiments. The electronic device can be a mobile phone, tablet computer, laptop computer, PDA, ultra-mobile personal computer (UMPC), handheld computer, walkie-talkie, personal digital assistant (PDA), portable media player (PMP), navigation device, wearable device, and smart bracelet.

[0082] Since the electronic device includes the antenna components described in the above embodiments, it also has the advantages of the antenna components described above, as detailed in the relevant description above.

[0083] The terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, steps, or characteristics described in connection with an embodiment or example that are 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, steps, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0084] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. An antenna assembly, characterized in that, include: Antenna radiator; SAR sensor, used to detect the capacitance between the antenna radiator and the user; An isolation circuit is disposed between the SAR sensor and the antenna radiator. The isolation circuit is configured such that the frequency corresponding to the peak value of the VSWR of the isolation circuit matches at least one operating frequency band of the antenna radiator, such that the isolation circuit has a maximum VSWR value in the at least one operating frequency band.

2. The antenna assembly according to claim 1, characterized in that, The isolation circuit includes at least one isolation unit, each isolation unit having a standing wave ratio peak value, and the frequency corresponding to the standing wave ratio peak value of each isolation unit is matched with at least one of the operating frequency bands; When the isolation circuit includes multiple isolation units, the isolation units are connected in series.

3. The antenna assembly according to claim 2, characterized in that, The isolation circuit includes multiple isolation units, and the antenna radiator has multiple operating frequency bands; Each of the isolation units corresponds one-to-one with a number of the operating frequency bands, and the frequency corresponding to the peak value of the standing wave ratio of each isolation unit matches the operating frequency band corresponding to that isolation unit. or, Each isolation unit corresponds to at least two of the plurality of operating frequency bands, and the frequency corresponding to the peak value of the standing wave ratio of each isolation unit matches one or at least two operating frequencies corresponding to that isolation unit.

4. The antenna assembly according to claim 3, characterized in that, When each isolation unit corresponds to a working frequency band, the frequency corresponding to the peak value of the standing wave ratio of the isolation unit falls within the working frequency band corresponding to that isolation unit; When each isolation unit corresponds to at least two operating frequency bands, the frequency corresponding to the peak value of the VSWR of the isolation unit falls between the maximum and minimum frequency values ​​of the at least two operating frequency bands corresponding to the isolation unit.

5. The antenna assembly according to claim 3, characterized in that, The antenna radiator has at least one frequency type; The operating frequency bands belonging to the same frequency type all correspond to one isolation unit.

6. The antenna assembly according to claim 5, characterized in that, The frequency type includes at least one of low frequency, medium frequency, and high frequency.

7. The antenna assembly according to claim 2, characterized in that, When the isolation circuit includes multiple isolation units, the circuit structure of each isolation unit is the same, or at least two of the isolation units have different circuit structures.

8. The antenna assembly according to any one of claims 2 to 7, characterized in that, The isolation unit has an input terminal connected to the SAR sensor and an output terminal connected to the antenna radiator. The isolation unit includes: A first inductor, a first resistor, and a first capacitor are disposed between the input and output terminals of the isolation unit, wherein the first inductor and the first resistor are connected in series, and the first capacitor is connected in parallel with the first inductor and the first resistor connected in series; or, A second inductor, a second resistor, a second capacitor, and a third capacitor are disposed between the input and output terminals of the isolation unit. The third capacitor is connected in series with the second resistor. The second inductor is connected in parallel with the third capacitor and the second resistor connected in series. The second capacitor is connected in series with the second inductor, the third capacitor, and the second resistor connected in parallel. Alternatively, A third inductor, a fourth capacitor, and a fifth capacitor are disposed between the input and output terminals of the isolation unit. The third inductor and the fifth capacitor are connected in series, and the fourth capacitor is connected in parallel with the third inductor and the fifth capacitor connected in series.

9. The antenna assembly according to any one of claims 1 to 7, characterized in that, The output of the isolation circuit is connected to the feed point of the antenna radiator, and the input of the isolation circuit is connected to the SAR sensor.

10. The antenna assembly according to any one of claims 1 to 7, characterized in that, The antenna assembly further includes an antenna matching circuit, one end of which is connected to the feed point of the antenna radiator, and the other end of which is connected to a signal source; and / or, The antenna assembly also includes a grounding capacitor, one end of which is connected to the grounding point of the antenna radiator, and the other end of which is grounded.

11. An electronic device, characterized in that, The electronic device includes an antenna assembly as described in any one of claims 1 to 10.

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