Electronic equipment and wearable equipment

Abstract

The invention provides electronic equipment and wearable equipment. The electronic equipment comprises a closed metal ring, a circuit board, an antenna feed point, a first matching circuit, a second matching circuit and a third matching circuit, one end of the antenna feed point is connected with the first position of the metal ring, and the other end is connected with the circuit board; one end of the first matching circuit is connected with the second position of the metal ring, and the other end is connected with the circuit board; one end of the second matching circuit is connected with the third position of the metal ring, and the other end is connected with the circuit board; one end of the third matching circuit is connected with the fourth position of the metal ring, and the other end is connected with the circuit board; wherein the metal ring is located in a target working frequency band, and the metal ring serves as a circularly polarized antenna to radiate signals of the target working frequency band through the first matching circuit, the second matching circuit and the third matching circuit.

Description

Technical Field

[0001] The present application relates to the field of communication technology, and in particular to an electronic device and a wearable device. Background Art

[0002] Satellite positioning and track recording are important functions of smart watches. Due to the obstruction of ground buildings, the transmission efficiency from satellite to ground is reduced. The transmitting antenna from satellite to ground generally adopts right-hand circular polarization, so there is polarization mismatch when communicating with the ground. In addition, if the WIFI antenna has circular polarization characteristics, it will have a good user experience. Circularly polarized antennas have the advantages of high anti-interference, reduced polarization loss, overcoming multipath effects, miniaturization and broadband. However, watches are subject to limited volume or industrial design, which makes it difficult to implement circularly polarized antennas. Summary of the invention

[0003] The present application provides an electronic device and a wearable device.

[0004] An embodiment of the present application provides an electronic device, including: a closed metal ring, a circuit board, an antenna feed point, a first matching circuit, a second matching circuit, and a third matching circuit;

[0005] One end of the antenna feed point is connected to the first position of the metal ring, and the other end is connected to the circuit board; one end of the first matching circuit is connected to the second position of the metal ring, and the other end is connected to the circuit board; one end of the second matching circuit is connected to the third position of the metal ring, and the other end is connected to the circuit board; one end of the third matching circuit is connected to the fourth position of the metal ring, and the other end is connected to the circuit board; wherein the metal ring is in the target working frequency band, and the first matching circuit, the second matching circuit and the third matching circuit enable the metal ring to radiate the signal of the target working frequency band as a circularly polarized antenna.

[0006] Among them, the first matching circuit, the second matching circuit and the third matching circuit make the amplitude and phase of the two working modes of the metal ring radiating the target working frequency band meet the target conditions.

[0007] The target operating frequency band includes a plurality of different frequency band ranges; each target operating frequency band corresponds to a group of matching elements, and each group of matching elements includes sub-elements distributed in the first matching circuit, the second matching circuit and the third matching circuit.

[0008] Wherein, the first matching circuit comprises a first switch connected to the metal ring, and the first switch can connect different sub-elements respectively;

[0009] The second matching circuit includes a second switch connected to the metal ring, and the second switch can connect different sub-elements respectively;

[0010] The third matching circuit comprises a third switch connected to the metal ring, and the third switch can connect different sub-elements respectively;

[0011] The metal ring is in a first target operating frequency band, and is connected to a first sub-element corresponding to the first target operating frequency band in the first matching circuit, the second matching circuit, and the third matching circuit through the first switch, the second switch, and the third switch;

[0012] The metal ring is in a second target operating frequency band, and is connected to a second sub-element corresponding to the second target operating frequency band in the first matching circuit, the second matching circuit, and the third matching circuit through the first switch, the second switch, and the third switch;

[0013] The metal ring is in a third target operating frequency band, and is connected to the first matching circuit, the second matching circuit, and a third sub-element corresponding to the third target operating frequency band in the third matching circuit through the first switch, the second switch, and the third switch.

[0014] Wherein, the first position corresponds to between the six o'clock and nine o'clock positions on the surface where the metal ring is located;

[0015] The second position corresponds to between the six o'clock position and the seven o'clock position of the surface where the metal ring is located;

[0016] The third position corresponds to between the three o'clock position and the six o'clock position of the surface where the metal ring is located;

[0017] The fourth position corresponds to between the one o'clock position and the three o'clock position of the surface where the metal ring is located.

[0018] Among them, the first matching circuit, the second matching circuit and the third matching circuit are arranged or connected with the first sub-element, so that the metal ring radiates the signal of the first target working frequency band as a circularly polarized antenna, and the current phases of the two working modes of the metal ring radiating the first target working frequency band form a phase difference of 90 degrees and the signal rotates in the counterclockwise direction.

[0019] Among them, the first matching circuit, the second matching circuit and the third matching circuit are arranged or connected to the second sub-element, so that the metal ring radiates the signal of the second target working frequency band as a circularly polarized antenna, and the current phases of the two working modes of the metal ring radiating the second target working frequency band form a phase difference of 90 degrees and the signal rotates in the counterclockwise direction.

[0020] Among them, the first matching circuit, the second matching circuit and the third matching circuit are arranged or connected to a third sub-element, so that the metal ring radiates the signal of the third target working frequency band as a circularly polarized antenna, and the current phases of the two working modes of the metal ring radiating the third target working frequency band form a phase difference of 90 degrees and the signal rotates in a clockwise direction.

[0021] Among them, it also includes: a modem;

[0022] The modem is electrically connected to the first switch, the second switch and the third switch; the modem is used to control the first switch to connect or disconnect different sub-elements in the first matching circuit, control the second switch to connect or disconnect different sub-elements in the second matching circuit, and control the third switch to connect or disconnect different sub-elements in the third matching circuit.

[0023] Another aspect of the present application embodiment provides a wearable device, including an electronic device and a housing;

[0024] The electronic device comprises: a closed metal ring, a circuit board, an antenna feed point, a first matching circuit, a second matching circuit and a third matching circuit; one end of the antenna feed point is connected to the first position of the metal ring, and the other end is connected to the circuit board; one end of the first matching circuit is connected to the second position of the metal ring, and the other end is connected to the circuit board; one end of the second matching circuit is connected to the third position of the metal ring, and the other end is connected to the circuit board; one end of the third matching circuit is connected to the fourth position of the metal ring, and the other end is connected to the circuit board;

[0025] The shell wraps the electronic device, and at least a portion of the shell forms the metal ring.

[0026] It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of the present application, nor is it intended to limit the scope of the present application. Other features of the present application will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] By reading the detailed description below with reference to the accompanying drawings, the above and other purposes, features and advantages of the exemplary embodiments of the present application will become readily understood. In the accompanying drawings, several embodiments of the present application are shown in an exemplary and non-limiting manner, wherein:

[0028] In the drawings, the same or corresponding reference numerals represent the same or corresponding parts.

[0029] Figure 1A schematic diagram of the structure of an electronic device according to an embodiment of the present application is shown;

[0030] Figure 2 A schematic diagram of current in two working modes when a metal ring radiates according to an embodiment of the present application is shown;

[0031] Figure 3 A schematic diagram of current in two working modes when a metal ring radiates according to another embodiment of the present application is shown;

[0032] Figure 4 A schematic structural diagram of an electronic device according to another embodiment of the present application is shown;

[0033] Figure 5 A schematic structural diagram of a first matching circuit according to an embodiment of the present application is shown;

[0034] Figure 6 A schematic structural diagram of a second matching circuit according to an embodiment of the present application is shown;

[0035] Figure 7 A schematic structural diagram of a third matching circuit according to an embodiment of the present application is shown;

[0036] Fig. 8A A schematic structural diagram of a first matching circuit according to another embodiment of the present application is shown;

[0037] Figure 8B A schematic structural diagram of a second matching circuit according to another embodiment of the present application is shown;

[0038] Figure 8C A schematic structural diagram of a third matching circuit according to another embodiment of the present application is shown;

[0039] Fig.9A A schematic diagram showing a range of a first position of a metal ring according to an embodiment of the present application;

[0040] Fig. 9B A schematic diagram showing a range of a first position of a metal ring according to another embodiment of the present application;

[0041] Fig. 9C A schematic diagram showing a range of a first position of a metal ring according to another embodiment of the present application;

[0042] Fig.9D A schematic diagram showing a range of a first position of a metal ring according to another embodiment of the present application;

[0043] Fig.10 A schematic structural diagram of an electronic device according to another embodiment of the present application is shown;

[0044] Fig.11A A schematic structural diagram of an electronic device according to another embodiment of the present application is shown;

[0045] Fig. 11B A schematic structural diagram of a first matching circuit according to another embodiment of the present application is shown;

[0046] Fig. 11C A schematic structural diagram of a second matching circuit according to another embodiment of the present application is shown;

[0047] Fig.11D A schematic structural diagram of a third matching circuit according to another embodiment of the present application is shown;

[0048] Fig. 12A A schematic structural diagram of an electronic device according to another embodiment of the present application is shown;

[0049] Fig. 12B A schematic structural diagram of a first matching circuit according to another embodiment of the present application is shown;

[0050] Fig. 12C A schematic structural diagram of a second matching circuit according to another embodiment of the present application is shown;

[0051] Fig.12D A schematic structural diagram of a third matching circuit according to another embodiment of the present application is shown;

[0052] Fig.13 A schematic structural diagram of an electronic device according to another embodiment of the present application is shown;

[0053] Fig.14 A schematic structural diagram of an electronic device according to another embodiment of the present application is shown;

[0054] Fig.15 A schematic diagram of the axial ratios of the GPS L1 frequency band, the GPS L5 frequency band, and the WIFI 2.4 frequency band according to an embodiment of the present application is shown;

[0055] Fig.16A The figure shows the gain pattern of the GPS L5 frequency band according to one embodiment of the present application;

[0056] Fig. 16B shows a gain pattern of the GPS L1 frequency band according to an embodiment of the present application;

[0057] Fig. 16C The gain pattern of the WIFI 2.4 frequency band according to an embodiment of the present application is shown;

[0058] Fig.17A schematic structural diagram of a wearable device according to an embodiment of the present application is shown. DETAILED DESCRIPTION

[0059] In order to make the purpose, features, and advantages of the present application more obvious and easy to understand, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0060] In order to realize circular polarization antenna in small devices, improve the anti-interference ability of small devices, reduce polarization loss, overcome multipath effect, miniaturize and broadband, an embodiment of the present application provides an electronic device, such as Figure 1 As shown, it includes: a closed metal ring 101, a circuit board 102, an antenna feed point 103, a first matching circuit 104, a second matching circuit 105 and a third matching circuit 106.

[0061] One end of the antenna feed point 103 is connected to the first position 1011 of the metal ring 101, and the other end is connected to the circuit board 102; one end of the first matching circuit 104 is connected to the second position 1012 of the metal ring 101, and the other end is connected to the circuit board 102; one end of the second matching circuit 105 is connected to the third position 1013 of the metal ring 101, and the other end is connected to the circuit board 102; one end of the third matching circuit 106 is connected to the fourth position 1014 of the metal ring 101, and the other end is connected to the circuit board 102.

[0062] The metal ring 101 is made of a conductive material and can be circular, rectangular or other suitable shapes. In this embodiment, the size of the metal ring 101 is set to 44 mm in length, 36 mm in width and 8 mm in height. In other embodiments, the size of the metal ring 101 can be adjusted according to specific needs.

[0063] The metal ring 101 is disposed on the periphery of the circuit board 102 and is spaced a preset distance from the circuit board 102, and the space between the metal ring 101 and the circuit board 102 forms a clearance area. In this embodiment, the metal ring 101 is spaced 1.5 mm from the circuit board 102. In other embodiments, the preset distance between the metal ring 101 and the circuit board 102 can be adjusted according to specific needs.

[0064] One end of the antenna feed point 103 is connected to the first position 1011 of the metal ring 101, and the other end is connected to the position of the circuit board 102 corresponding to the first position 1011. Figure 1As shown in , the first position 1011 is set at the seven o'clock position of the metal ring 101, and the other end of the antenna feed point 103 is connected to the seven o'clock position of the circuit board 102. More specifically, the antenna feed point 103 is connected to the RF circuit in the circuit board 102, and the position of the RF circuit covers the position in the circuit board 102 corresponding to the first position 1011.

[0065] One end of the first matching circuit 104 is connected to the second position 1012 of the metal ring 101, and the other end is connected to the position of the circuit board 102 corresponding to the second position 1012. Figure 1 As shown in , the second position 1012 is set at the six o'clock position of the metal ring 101, and the other end of the first matching circuit 104 is connected to the six o'clock position of the circuit board 102. More specifically, the first matching circuit 104 is connected to the reference ground in the circuit board 102, and the position of the reference ground covers the position in the circuit board 102 corresponding to the second position 1012.

[0066] One end of the second matching circuit 105 is connected to the third position 1013 of the metal ring 101, and the other end is connected to the position corresponding to the third position 1013 in the circuit board 102. Figure 1 As shown in , the third position 1013 is set at the four o'clock position of the metal ring 101, and the other end of the second matching circuit 105 is connected to the four o'clock position of the circuit board 102. More specifically, the second matching circuit 105 is connected to the reference ground in the circuit board 102, and the position of the reference ground also covers the position of the circuit board 102 corresponding to the third position 1013.

[0067] One end of the third matching circuit 106 is connected to the fourth position 1014 of the metal ring 101, and the other end is connected to the position corresponding to the fourth position 1014 in the circuit board 102. Figure 1 As shown in , the fourth position 1014 is set at the two o'clock position of the metal ring 101, and the other end of the third matching circuit 106 is connected to the two o'clock position of the circuit board 102. More specifically, the third matching circuit 106 is connected to the reference ground in the circuit board 102, and the position of the reference ground also covers the position of the circuit board 102 corresponding to the fourth position 1014.

[0068] The metal ring 101 is in a target working frequency band, and the metal ring 101 is used as a circularly polarized antenna to radiate signals in the target working frequency band through the first matching circuit 102 , the second matching circuit 103 and the third matching circuit 104 .

[0069] Capacitors and / or inductors are provided in the first matching circuit 104, the second matching circuit 105, and the third matching circuit 106. By configuring and adjusting the first position 1011, the second position 1012, the third position 1013, and the fourth position 1014 in the metal ring 101 and the combination of capacitors and / or inductors in the first matching circuit 104, the second matching circuit 105, and the third matching circuit 106, the metal ring 101 radiates signals of the target working frequency band as a circularly polarized antenna.

[0070] In the above scheme, the first position 1011, the second position 1012, the third position 1013 and the fourth position 1014 in the metal ring 101 and the combination of the capacitors and / or inductors in the first matching circuit 104, the second matching circuit 105 and the third matching circuit 106 are configured. The metal ring 101 is used as a circularly polarized antenna to radiate the signal of the target working frequency band. By adjusting the first position 1011, the second position 1012, the third position 1013 and the fourth position 1014 in the metal ring 101 and the combination of the capacitors and / or inductors in the first matching circuit 104, the second matching circuit 105 and the third matching circuit 106, the target working frequency band and the type of circularly polarized signal radiated by the metal ring 101 can be switched. In addition, the electronic device structure of this scheme is simple, only capacitors and / or inductors need to be set, the cost is low, and it is easy to integrate. It is realized to build a circularly polarized antenna in a small device, improve the anti-interference ability of the small device, reduce polarization loss, overcome multipath effect, miniaturize and broadband.

[0071] In an example of the present application, an electronic device is also provided, which uses the first matching circuit 104, the second matching circuit 105 and the third matching circuit 106 to ensure that the amplitude and phase of the two working modes of the target working frequency band radiated by the metal ring 101 meet the target conditions.

[0072] For example, Figure 2 As shown, the metal ring 101 operates in M3 working mode and M4 working mode simultaneously when radiating signals through the first matching circuit 104, the second matching circuit 105 and the third matching circuit 106. In the M3 working mode, the phase of the current is 90 degrees, so that the battery forms X polarization. In the M4 working mode, the phase of the current is 0 degrees, so that the electric field forms Y polarization. As a result, the current phases of the two working modes form a 90-degree phase difference and the radiated signal rotates in a clockwise direction, and the amplitude satisfies the metal ring 101 to radiate a 2400MHz-2500MHz signal, thereby being able to radiate a left-handed circularly polarized signal in the WIFI2.4 frequency band.

[0073] For example, Figure 3As shown, the metal ring 101 operates in M2 working mode and M3 working mode simultaneously when radiating signals through the first matching circuit 104, the second matching circuit 105 and the third matching circuit 106. In the M2 working mode, the phase of the current is 0 degrees, so that the electric field forms Y polarization. In the M3 working mode, the phase of the current is 90 degrees, so that the battery forms X polarization. As a result, the current phases of the two working modes form a 90-degree phase difference and the radiated signal rotates in the counterclockwise direction, and the amplitude satisfies the metal ring 101 to radiate a 1575MHz signal, so that a right-hand circularly polarized signal of the GPSL1 frequency band can be radiated.

[0074] In the above scheme, the amplitude and phase of the two working modes of the target working frequency band radiated by the metal ring 101 can be changed by adjusting the settings of the first matching circuit 104, the second matching circuit 105 and the third matching circuit 106. When the amplitude and phase of the two working modes of the target working frequency band radiated by the metal ring 101 meet specific conditions, the metal ring 101 can radiate the signal of the target working frequency band required during operation.

[0075] In an example of the present application, an electronic device is also provided, such as Figure 4 As shown, the target operating frequency band includes multiple different frequency band ranges; wherein each target operating frequency band corresponds to a group of matching elements, and each group of matching elements includes sub-elements 107 distributed in the first matching circuit 104, the second matching circuit 105 and the third matching circuit 106.

[0076] In this embodiment, the sub-element 107 may be a capacitor or an inductor. In other embodiments, the sub-element 107 may be any impedance element.

[0077] The target operating frequency band includes multiple different frequency band ranges. For example, the frequency band range of the WIFI2.4 frequency band is 2400MHz-2500MHz. For another example, the frequency band range of the WIFI5 frequency band is 5150MHz-5825MHz.

[0078] The sub-elements 107 distributed in the first matching circuit 104 , the second matching circuit 105 , and the third matching circuit 106 form a group of matching elements, so that the metal ring 101 can radiate signals in a target working frequency band.

[0079] For example, as shown in Table 1, the sub-element 107 in the first matching circuit 104 is set to a capacitor with a capacitance value of 5.3 pF (nanofarad), the sub-element 107 in the second matching circuit 105 is set to a capacitor with a capacitance value of 5.1 pF, and the sub-element 107 in the third matching circuit 106 is set to a capacitor with a capacitance value of 0.8 pF, so that the metal ring 101 can radiate a right-hand circularly polarized signal in the GPSL5 frequency band.

[0080] For another example, as shown in Table 1, the sub-element 107 in the first matching circuit 104 is set to a capacitor with a capacitance value of 2.6 pF, the sub-element 107 in the second matching circuit 105 is set to a capacitor with a capacitance value of 0.2 pF, and the sub-element 107 in the third matching circuit 106 is set to an inductor with an inductance value of 3.9 pH (nanohenry), so that the metal ring 101 can radiate a right-handed circularly polarized signal in the GPSL1 frequency band.

[0081] For another example, as shown in Table 1, the sub-element 107 in the first matching circuit 104 is set to a capacitor with a capacitance value of 2.6 pF, the sub-element 107 in the second matching circuit 105 is set to a capacitor with a capacitance value of 0.4 pF, and the sub-element 107 in the third matching circuit 106 is set to a capacitor with a capacitance value of 0.4 pF, so that the metal ring 101 can radiate a left-handed circularly polarized signal in the WIFI2.4 frequency band.

[0082] Target operating frequency band polarization First matching circuit Second matching circuit The third matching circuit GPSL5 Right-hand circular polarization 5.3pF capacitor 5.1pF capacitor 0.8pF capacitor GPSL1 Right-hand circular polarization 2.6pF capacitor 0.2pF capacitor 3.9pH Inductor WIFI2.4 Left-hand circular polarization 2.6pF capacitor 0.4pF capacitor 0.4pF capacitor

[0083] Table 1

[0084] In the above scheme, by adjusting the sub-elements 107 distributed in the first matching circuit 104, the second matching circuit 105 and the third matching circuit 106, a matching element group corresponding to the target working frequency band is formed, so that the metal ring 101 can radiate the signal of the target working frequency band required during operation.

[0085] In an example of the present application, an electronic device is also provided, such as Figure 5 As shown, the first matching circuit 104 includes a first switch 1041 connected to the metal ring 101 , and the first switch 1041 can connect different sub-elements 107 respectively.

[0086] At least two different sub-elements 107 may be provided in the first matching circuit 104, and the connected sub-elements 107 may be switched by switching the first switch 1041. The number of channels that can be connected by the first switch 1041 is the same as the number of sub-elements 107 provided in the first matching circuit 104. For example, if four different sub-elements 107 are provided in the first matching circuit 104, the first switch 1041 should be a four-way switch.

[0087] like Figure 6 As shown, the second matching circuit 105 includes a second switch 1051 connected to the metal ring 101 , and the second switch 1051 can connect different sub-elements 107 respectively.

[0088] At least two different sub-elements 107 may be provided in the second matching circuit 105, and the connected sub-elements 107 can be switched by switching the second switch 1051. The number of channels that can be connected by the second switch 1051 is the same as the number of sub-elements 107 provided in the second matching circuit 105. For example, if three different sub-elements 107 are provided in the second matching circuit 105, the second switch 1051 should be a three-way switch.

[0089] like Figure 7 As shown, the third matching circuit 106 includes a third switch 1061 connected to the metal ring 101 , and the third switch 1061 can connect different sub-elements 107 respectively.

[0090] At least two different sub-elements 107 may be provided in the third matching circuit 106, and the connected sub-elements 107 may be switched by switching the third switch 1061. The number of channels that can be connected by the third switch 1061 is the same as the number of sub-elements 107 provided in the third matching circuit 106. For example, if two different sub-elements 107 are provided in the third matching circuit 106, the third switch 1061 should be a two-way switch.

[0091] The metal ring 101 is in the first target operating frequency band, and is connected to the first sub-element corresponding to the first target operating frequency band in the first matching circuit 104 , the second matching circuit 105 , and the third matching circuit 106 through the first switch 1041 , the second switch 1051 , and the third switch 1061 .

[0092] The metal ring 101 is in the second target operating frequency band, and is connected to the second sub-element corresponding to the second target operating frequency band in the first matching circuit 104 , the second matching circuit 105 , and the third matching circuit 106 through the first switch 1041 , the second switch 1051 , and the third switch 1061 .

[0093] The metal ring 101 is in the third target operating frequency band, and is connected to the third sub-element corresponding to the third target operating frequency band in the first matching circuit 104 , the second matching circuit 105 , and the third matching circuit 106 through the first switch 1041 , the second switch 1051 , and the third switch 1061 .

[0094] For example, the first target operating frequency band is set to the GPSL5 frequency band, the second target operating frequency band is set to the GPSL1 frequency band, and the third target operating frequency band is set to the WIFI2.4 frequency band. Fig. 8AAs shown, three sub-elements 107 are provided in the first matching circuit, namely, a first sub-element with a capacitance value of 5.3 pF, a second sub-element with a capacitance value of 2.6 pF, and a third sub-element with a capacitance value of 2.6 pF. Figure 8B As shown, three sub-elements 107 are provided in the second matching circuit, namely, a first sub-element with a capacitance value of 5.1 pF, a second sub-element with a capacitance value of 0.2 pF, and a third sub-element with a capacitance value of 0.4 pF. Figure 8C As shown, three sub-elements 107 are set in the third matching circuit, which are the first sub-element with a capacitance value of 0.8pF, the second sub-element with an inductance value of 3.9pH, and the third sub-element with a capacitance value of 0.4pF. The first sub-element with a capacitance value of 5.3pF in the first matching circuit 104 is connected by switching the first switch 1041, the first sub-element with a capacitance value of 5.1pF in the second matching circuit 105 is connected by switching the second switch 1051, and the first sub-element with a capacitance value of 0.8pF in the third matching circuit 106 is connected by switching the third switch 1061. The metal ring 101 radiates the signal of the GPSL5 frequency band. The second sub-element with a capacitance value of 2.6pF in the first matching circuit 104 is connected by switching the first switch 1041, the second sub-element with a capacitance value of 0.2pF in the second matching circuit 105 is connected by switching the second switch 1051, and the second sub-element with an inductance value of 3.9pH in the third matching circuit 106 is connected by switching the third switch 1061. The metal ring 101 radiates the signal of the GPSL1 frequency band. By switching the first switch 1041 to connect the third sub-element with a capacitance value of 2.6 pF in the first matching circuit 104, switching the second switch 1051 to connect the third sub-element with a capacitance value of 0.4 pF in the second matching circuit 105, and switching the third switch 1061 to connect the third sub-element with a capacitance value of 0.4 pH in the third matching circuit 106, the metal ring 101 radiates the signal of the WIFI 2.4 frequency band.

[0095] It should be pointed out that the first target operating frequency band, the second target operating frequency band and the third target operating frequency band in this embodiment can be replaced with any other frequency band, and the number of sub-elements in the first matching circuit 104, the second matching circuit 105 and the third matching circuit 106 can be set based on the number of target operating frequency bands that need to be switched. For example, if the target operating frequency bands that need to be switched include GPSL5 and GPSL1, the number of sub-elements in the first matching circuit 104, the second matching circuit 105 and the third matching circuit 106 can be set to 2.

[0096] The circularly polarized antennas currently on the market need to change the capacitors and / or inductors inside the electronic device to achieve multi-band circularly polarized antennas, and it is impossible to achieve multi-band circularly polarized antennas without changing the capacitors and / or inductors. Therefore, it is currently difficult to achieve a switchable multi-band circularly polarized antenna in a small device.

[0097] In the above scheme, the first switch 1041 and the same number of sub-elements as the number of target working frequency bands to be switched are provided in the first matching circuit 104, the second switch 1051 and the same number of sub-elements as the number of target working frequency bands to be switched are provided in the second matching circuit 105, and the third switch 1061 and the same number of sub-elements as the number of target working frequency bands to be switched are provided in the third matching circuit 106. The connected sub-elements in the first matching circuit 104 are controlled by the first switch 1041, the connected sub-elements in the second matching circuit 105 are controlled by the second switch 1051, and the connected sub-elements in the third matching circuit 106 are controlled by the third switch 1061, so that the circular polarization antenna of multiple target working frequency bands can be switched in a small device without changing the structure.

[0098] In an example of the present application, an electronic device is also provided, wherein the first position 1011 corresponds to between the six o'clock and nine o'clock positions on the surface where the metal ring 101 is located.

[0099] like Fig.9A As shown, Fig.9A The dotted part of the middle metal ring 101 is the range between the six o'clock position and the nine o'clock position of the surface where the metal ring 101 is located. The first position 1011 can be set at any point in this range, which can stimulate more working modes and has a better bandwidth.

[0100] More preferably, the first position 1011 can be set at the seven o'clock position of the metal ring 101 .

[0101] The second position 1012 corresponds to between the six o'clock position and the seven o'clock position of the surface where the metal ring 101 is located.

[0102] like Fig. 9B As shown, Fig. 9B The dotted line portion of the middle metal ring 101 is the range between the six o'clock position and the seven o'clock position of the surface where the metal ring 101 is located. The second position 1012 can be set at any point in the range, which can optimize impedance matching, reduce signal reflection, and improve transmission efficiency. In addition, it can also enhance the coverage and uniformity of the signal, more effectively control the phase and amplitude of circular polarization, and enhance the polarization effect.

[0103] More preferably, the second position 1012 can be set at the midpoint between the six o'clock position and the seven o'clock position of the metal ring 101 .

[0104] The third position 1013 corresponds to between the three o'clock position and the six o'clock position of the surface where the metal ring 101 is located.

[0105] like Fig. 9C As shown, Fig. 9CThe dotted line portion of the metal ring 101 is the range between the three o'clock position and the six o'clock position of the surface where the metal ring 101 is located. The third position 1013 can be set at any point in the range, which can optimize impedance matching, reduce signal reflection, and improve transmission efficiency. In addition, it can also enhance the coverage and uniformity of the signal, more effectively control the phase and amplitude of circular polarization, and enhance the polarization effect.

[0106] More preferably, the third position 1013 can be set at the five o'clock position of the metal ring 101 .

[0107] The fourth position 1014 corresponds to between the one o'clock position and the three o'clock position of the surface where the metal ring 101 is located.

[0108] like Fig.9D As shown, Fig.9D The dotted line portion of the metal ring 101 is the range between the 1 o'clock position and the 3 o'clock position of the surface where the metal ring 101 is located. The fourth position 1014 can be set at any point in the range, which can optimize impedance matching, reduce signal reflection, and improve transmission efficiency. In addition, it can also enhance the coverage and uniformity of the signal, more effectively control the phase and amplitude of circular polarization, and enhance the polarization effect.

[0109] More preferably, the fourth position 1014 can be set at the midpoint between the 1 o'clock position and the 3 o'clock position of the metal ring 101 .

[0110] In one example of the present application, an electronic device is also provided, wherein the first matching circuit 104, the second matching circuit 105 and the third matching circuit 106 are arranged or connected to a first sub-element so that the metal ring 101 radiates a signal of a first target working frequency band as a circularly polarized antenna, and the current phases of the two working modes of the metal ring 101 radiating the first target working frequency band form a phase difference of 90 degrees and the signal rotates in a counterclockwise direction.

[0111] For example, the first target operating frequency band requires the metal ring 101 to radiate a right-hand circularly polarized signal. Fig.10 As shown, a first sub-element with a capacitance value of 5.3 pF is provided in the first matching circuit 104, a first sub-element with a capacitance value of 5.1 pF is provided in the second matching circuit 105, and a first sub-element with a capacitance value of 0.8 pF is provided in the third matching circuit 106. The current phases of the two working modes of the metal ring 101 radiating the first target working frequency band form a 90-degree phase difference and the signal rotates in the counterclockwise direction, that is, the metal ring 101 radiates a right-hand circularly polarized signal of the first target working frequency band.

[0112] For another example, the first target operating frequency band requires the metal ring 101 to radiate a right-hand circularly polarized signal. The electronic device can switch between three target operating frequency bands, so the first matching circuit 104, the second matching circuit 105 and the third matching circuit 106 are all provided with a first sub-element, a second sub-element and a third sub-element. Fig. 8A As shown, the first sub-element with a capacitance value of 5.3 pF in the first matching circuit 104 is connected by switching the first switch 1041. Figure 8B As shown, the first sub-element with a capacitance value of 5.1 pF in the second matching circuit 105 is connected by switching the second switch 1051. Figure 8C As shown, by switching the third switch 1061 to connect the first sub-element with a capacitance value of 0.8 pF in the third matching circuit 106, the current phases of the two working modes radiated by the metal ring 101 in the first target working frequency band form a 90-degree phase difference and the signal rotates in the counterclockwise direction, that is, the metal ring 101 radiates a right-hand circularly polarized signal in the first target working frequency band.

[0113] In the above scheme, by setting or connecting the first sub-element in the first matching circuit 104, the second matching circuit 105 and the third matching circuit 106, the current phases of the two working modes radiated by the metal ring 101 in the first target working frequency band form a phase difference of 90 degrees and the signal rotates in the counterclockwise direction, that is, the metal ring 101 can radiate a right-handed circularly polarized signal in the first target working frequency band.

[0114] In one example of the present application, an electronic device is also provided, wherein the first matching circuit 104, the second matching circuit 105 and the third matching circuit 106 are arranged or connected to a second sub-element so that the metal ring 101 radiates a signal of a second target working frequency band as a circularly polarized antenna, and the current phases of the two working modes of the metal ring 101 radiating the second target working frequency band form a phase difference of 90 degrees and the signal rotates in a counterclockwise direction.

[0115] For example, the second target operating frequency band requires the metal ring 101 to radiate a right-hand circularly polarized signal. Fig.11A As shown, a second sub-element with a capacitance value of 2.6 pF is provided in the first matching circuit 104, a second sub-element with a capacitance value of 0.2 pF is provided in the second matching circuit 105, and a second sub-element with an inductance value of 3.9 pH is provided in the third matching circuit 106. The current phases of the two working modes of the metal ring 101 radiating the second target working frequency band form a 90-degree phase difference and the signal rotates in the counterclockwise direction, that is, the metal ring 101 radiates a right-hand circularly polarized signal of the second target working frequency band.

[0116] For another example, the second target operating frequency band requires the metal ring 101 to radiate a right-hand circularly polarized signal. The electronic device can switch between three target operating frequency bands, so the first matching circuit 104, the second matching circuit 105 and the third matching circuit 106 are all provided with a first sub-element, a second sub-element and a third sub-element. Fig. 11B As shown, the second sub-element with a capacitance value of 2.6 pF in the first matching circuit 104 is connected by switching the first switch 1041. Fig. 11C As shown, the second sub-element with a capacitance value of 0.2 pF in the second matching circuit 105 is connected by switching the second switch 1051. Fig.11D As shown, by switching the third switch 1061 to connect the second sub-element with an inductance value of 3.9pH in the third matching circuit 106, the current phases of the two working modes radiated by the metal ring 101 in the second target working frequency band form a 90-degree phase difference and the signal rotates in the counterclockwise direction, that is, the metal ring 101 radiates a right-hand circularly polarized signal in the second target working frequency band.

[0117] In the above scheme, by setting or connecting the second sub-element in the first matching circuit 104, the second matching circuit 105 and the third matching circuit 106, the current phases of the two working modes radiated by the metal ring 101 in the second target working frequency band form a phase difference of 90 degrees and the signal rotates in the counterclockwise direction, that is, the metal ring 101 can radiate a right-handed circularly polarized signal in the second target working frequency band.

[0118] In one example of the present application, an electronic device is also provided, wherein the first matching circuit 104, the second matching circuit 105 and the third matching circuit 106 are arranged or connected to a third sub-element, so that the metal ring 101 radiates a signal of a third target working frequency band as a circularly polarized antenna, and the current phases of the two working modes of the metal ring 101 radiating the third target working frequency band form a phase difference of 90 degrees and the signal rotates in a clockwise direction.

[0119] For example, the third target operating frequency band requires the metal ring 101 to radiate left-hand circularly polarized signals. Fig. 12A As shown, a third sub-element with a capacitance value of 2.6 pF is provided in the first matching circuit 104, a third sub-element with a capacitance value of 0.4 pF is provided in the second matching circuit 105, and a third sub-element with a capacitance value of 0.4 pF is provided in the third matching circuit 106. The current phases of the two working modes of the metal ring 101 radiating the third target working frequency band form a 90-degree phase difference and the signal rotates in a clockwise direction, that is, the metal ring 101 radiates a left-handed circularly polarized signal of the third target working frequency band.

[0120] For another example, the third target operating frequency band requires the metal ring 101 to radiate a left-hand circularly polarized signal. The electronic device can switch between three target operating frequency bands, so the first matching circuit 104, the second matching circuit 105 and the third matching circuit 106 are all provided with a first sub-element, a second sub-element and a third sub-element. Fig. 12B As shown, the third sub-element with a capacitance value of 2.6 pF in the first matching circuit 104 is connected by switching the first switch 1041. Fig. 12C As shown, the third sub-element with a capacitance value of 0.4 pF in the second matching circuit 105 is connected by switching the second switch 1051. Fig.12D As shown, by switching the third switch 1061 to connect the third sub-element with a capacitance value of 0.4 pF in the third matching circuit 106, the current phases of the two working modes of the metal ring 101 radiating the third target working frequency band form a 90-degree phase difference and the signal rotates in a clockwise direction, that is, the metal ring 101 radiates a left-handed circularly polarized signal of the third target working frequency band.

[0121] In the above scheme, by setting or connecting the third sub-element in the first matching circuit 104, the second matching circuit 105 and the third matching circuit 106, the current phases of the two working modes radiated by the metal ring 101 in the third target working frequency band form a phase difference of 90 degrees and the signal rotates in a clockwise direction, that is, the metal ring 101 can radiate a left-handed circularly polarized signal in the third target working frequency band.

[0122] In an example of the present application, an electronic device is also provided, such as Fig.13 As shown, it also includes: a modem 108;

[0123] The modem 108 is electrically connected to the first switch 1041, the second switch 1051 and the third switch 1061; the modem 108 is used to control the first switch 1041 to connect or disconnect different sub-elements 107 in the first matching circuit 104, control the second switch 1051 to connect or disconnect different sub-elements 107 in the second matching circuit 105, and control the third switch 1061 to connect or disconnect different sub-elements 107 in the third matching circuit 106.

[0124] The modem 108 can be disposed on the circuit board 102 or at any position in the electronic device. Preferably, the modem is disposed near the processor in the circuit board 102 so as to receive and execute instructions issued by the processor more quickly.

[0125] The modem 108 receives instructions issued by the processor and, based on the instructions, controls the first switch 1041 to connect or disconnect different sub-elements 107 in the first matching circuit 104, controls the second switch 1051 to connect or disconnect different sub-elements 107 in the second matching circuit 105, and / or controls the third switch 1061 to connect or disconnect different sub-elements 107 in the third matching circuit 106.

[0126] In an example of the present application, an electronic device is also provided, such as Fig.14 As shown, the first position 1011 is set at the seven o'clock position of the metal ring 101, the second position 1012 is set at the midpoint between the six o'clock position and the seven o'clock position of the metal ring 101, the third position 1013 is set at the five o'clock position of the metal ring 101, and the fourth position 1014 is set at the midpoint between the one o'clock position and the three o'clock position of the metal ring 101.

[0127] like Fig. 8A As shown, the first matching circuit 104 is provided with a first switch 1041, a first sub-element with a capacitance value of 5.3 pF, a second sub-element with a capacitance value of 2.6 pF, and a third sub-element with a capacitance value of 2.6 pF. The first sub-element, the second sub-element, or the third sub-element in the first matching circuit 104 can be connected through the first switch 1041.

[0128] like Figure 8B As shown, the second matching circuit 105 is provided with a second switch 1051, a first sub-element with a capacitance value of 5.1 pF, a second sub-element with a capacitance value of 0.2 pF, and a third sub-element with a capacitance value of 0.4 pF. The first sub-element, the second sub-element, or the third sub-element in the second matching circuit 105 can be connected through the second switch 1051.

[0129] like Figure 8C As shown, the third matching circuit 106 is provided with a third switch 1061, a first sub-element with a capacitance value of 0.8 pF, a second sub-element with an inductance value of 3.9 pH, and a third sub-element with a capacitance value of 0.4 pF. The first sub-element, the second sub-element, or the third sub-element in the third matching circuit 106 can be connected through the third switch 1061.

[0130] The first sub-element with a capacitance value of 5.3 pF in the first matching circuit 104 is connected through the first switch 1041, the first sub-element with a capacitance value of 5.1 pF in the second matching circuit 105 is connected through the second switch 1051, and the first sub-element with a capacitance value of 0.8 pF in the third matching circuit 106 is connected through the third switch 1061. The current phases of the M2 working mode and the M3 working mode of the metal ring 101 operating simultaneously form a 90-degree phase difference, and the radiated signal rotates in the counterclockwise direction, and the amplitude satisfies the metal ring 101 to radiate a 1176 MHz signal, thereby radiating a right-hand circularly polarized signal of the GPSL5 frequency band.

[0131] The second sub-element with a capacitance value of 2.6 pF in the first matching circuit 104 is connected through the first switch 1041, the second sub-element with a capacitance value of 0.2 pF in the second matching circuit 105 is connected through the second switch 1051, and the second sub-element with an inductance value of 3.9 pH in the third matching circuit 106 is connected through the third switch 1061. The current phases of the M2 working mode and the M3 working mode of the metal ring 101 operating simultaneously form a 90-degree phase difference, and the radiated signal rotates in the counterclockwise direction, and the amplitude satisfies the metal ring 101 to radiate a 1575 MHz signal, thereby radiating a right-hand circularly polarized signal in the GPSL1 frequency band.

[0132] The third sub-element with a capacitance value of 2.6 pF in the first matching circuit 104 is connected through the first switch 1041, the third sub-element with a capacitance value of 0.4 pF in the second matching circuit 105 is connected through the second switch 1051, and the third sub-element with a capacitance value of 0.4 pF in the third matching circuit 106 is connected through the third switch 1061. The current phases of the M3 working mode and the M4 working mode of the metal ring 101 operating simultaneously form a 90-degree phase difference, and the radiated signal rotates in the clockwise direction, and the amplitude satisfies the metal ring 101 to radiate a 2400 MHz-2500 MHz signal, thereby radiating a left-hand circularly polarized signal in the WIFI 2.4 frequency band.

[0133] In this embodiment, when the capacitance of the sub-element 107 connected to the first switch 1041 increases, the resonant frequency of the M2 working mode shifts downward, mainly affecting the GPS L5 frequency band. When the capacitance of the sub-element 107 connected to the first switch 1041 is around 5pF, the bandwidth narrows sharply.

[0134] When the capacitance of the sub-element 107 connected by the first switch 1041 increases, the resonant frequency of the M3 working mode shifts downward. When the capacitance of the sub-element 107 connected by the first switch 1041 is around 3 pF, the bandwidth of the signal above 2300 MHz becomes flat sharply.

[0135] Only when the capacitance value of the sub-element 107 connected by the first switch 1041 is around 3 pF, the bandwidth of the signal above 2300 MHz in the M4 working mode becomes flat sharply. The other capacitance values ​​have no effect on the M4 working mode.

[0136] When the capacitance value of the sub-element 107 connected to the second switch 1051 increases, the resonant frequency of the M2 working mode shifts downward, which mainly affects the GPSL1 frequency band and the GPSL5 frequency band, and has no effect on WIFI2.4.

[0137] When the capacitance value of the sub-element 107 connected to the second switch 1051 increases, the resonant frequency of the M2 working mode changes slightly, but it will affect the bandwidth, especially for the WIFI 2.4 frequency band. The smaller the capacitance value of the sub-element 107 connected to the second switch 1051, the better the corresponding bandwidth.

[0138] When the capacitance value of the sub-element 107 connected to the second switch 1051 changes, it has no effect on the M4 working mode.

[0139] When the capacitance of the sub-element 107 connected by the third switch 1061 increases, the resonant frequency of the M2 working mode shifts to a lower frequency and the bandwidth becomes wider. However, when the capacitance of the sub-element 107 connected by the third switch 1061 is greater than 3pF, it is close to a short circuit state and mainly works around 1850MHz.

[0140] When the capacitance value of the sub-element 107 connected to the third switch 1061 increases, the resonant frequency of the M3 working mode shifts to a low frequency and the bandwidth becomes narrower. However, when the capacitance value of the sub-element 107 connected to the third switch 1061 is greater than 3pF, it is close to a short-circuit state. When the capacitance value of the sub-element 107 connected to the third switch 1061 is around 0.5pF, it is close to an open-circuit state.

[0141] When the capacitance value of the sub-element 107 connected to the third switch 1061 changes, it has no effect on the M4 working mode.

[0142] When the inductance value of the sub-element 107 connected to the third switch 1061 increases, the resonant frequencies of the M2 working mode and the M3 working mode both shift toward a low frequency, and the shift amplitude is small.

[0143] When the inductance value of the sub-element 107 connected to the third switch 1061 changes, it has no effect on the M4 working mode.

[0144] In the above scheme, the working mode of the antenna is switched by loading different capacitors and / or inductors through switches, which realizes the three-band circular polarization characteristics. This scheme is simple and easy to implement, and has good antenna performance. In actual measurements, this scheme works well in the GPSL5 band, GPSL1 band and WIFI2.4 band. Fig.15As shown, the axial ratio is less than 3dB. Fig.16A , Fig. 16B and Fig. 16C As shown, the gain patterns in the GPSL5 band, GPSL1 band and WIFI2.4 band all have good omnidirectional characteristics.

[0145] This application provides an example of a wearable device, such as Fig.17 As shown, it includes an electronic device 100 and a housing 200;

[0146] The electronic device 100 includes: a closed metal ring 101, a circuit board 102, an antenna feed point 103, a first matching circuit 104, a second matching circuit 105 and a third matching circuit 106; one end of the antenna feed point 103 is connected to the first position 1011 of the metal ring 101, and the other end is connected to the circuit board 102; one end of the first matching circuit 104 is connected to the second position 1012 of the metal ring 101, and the other end is connected to the circuit board 102; one end of the second matching circuit 105 is connected to the third position 1013 of the metal ring 101, and the other end is connected to the circuit board 102; one end of the third matching circuit 106 is connected to the fourth position 1014 of the metal ring 101, and the other end is connected to the circuit board 102;

[0147] The housing 200 wraps the electronic device 100 , and at least a portion of the housing 200 forms the metal ring 101 .

[0148] The shell 200 may be made of non-metallic material, and the inner wall of the shell 200 may be made of metallic material to form a metal ring 101, which can realize a circularly polarized antenna in the wearable device while minimizing the volume of the wearable device.

[0149] It should be understood that the terms "first" and "second" shown above are only used for descriptive purposes and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present disclosure, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0150] The above is only a specific embodiment of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any person skilled in the art who is familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present disclosure, which should be included in the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be based on the protection scope of the claims.

Claims

1. An electronic device, comprising: A closed metal ring, a circuit board, an antenna feed point, a first matching circuit, a second matching circuit, and a third matching circuit; One end of the antenna feed point is connected to the first position of the metal ring, and the other end is connected to the circuit board; one end of the first matching circuit is connected to the second position of the metal ring, and the other end is connected to the circuit board; one end of the second matching circuit is connected to the third position of the metal ring, and the other end is connected to the circuit board; one end of the third matching circuit is connected to the fourth position of the metal ring, and the other end is connected to the circuit board; The metal ring is in a target working frequency band, and the metal ring is used as a circularly polarized antenna to radiate signals in the target working frequency band through the first matching circuit, the second matching circuit and the third matching circuit.

2. The electronic device according to claim 1, wherein the first matching circuit, the second matching circuit and the third matching circuit are used to make the amplitude and phase of the two working modes of the target working frequency band radiated by the metal ring meet the target conditions.

3. The electronic device according to claim 2, wherein the target operating frequency band includes a plurality of different frequency band ranges; wherein, Each target operating frequency band corresponds to a group of matching elements, and each group of matching elements includes sub-elements distributed in the first matching circuit, the second matching circuit, and the third matching circuit.

4. The electronic device according to claim 3, wherein the first matching circuit comprises a first switch connected to the metal ring, and the first switch can connect different sub-elements respectively; The second matching circuit includes a second switch connected to the metal ring, and the second switch can connect different sub-elements respectively; The third matching circuit comprises a third switch connected to the metal ring, and the third switch can connect different sub-elements respectively; in, The metal ring is in a first target operating frequency band, and is connected to a first sub-element corresponding to the first target operating frequency band in the first matching circuit, the second matching circuit, and the third matching circuit through the first switch, the second switch, and the third switch; The metal ring is in a second target operating frequency band, and is connected to a second sub-element corresponding to the second target operating frequency band in the first matching circuit, the second matching circuit, and the third matching circuit through the first switch, the second switch, and the third switch; The metal ring is in a third target operating frequency band, and is connected to the first matching circuit, the second matching circuit, and a third sub-element corresponding to the third target operating frequency band in the third matching circuit through the first switch, the second switch, and the third switch.

5. The electronic device according to claim 2, wherein the first position corresponds to between the six o'clock and nine o'clock positions on the surface where the metal ring is located; The second position corresponds to between the six o'clock position and the seven o'clock position of the surface where the metal ring is located; The third position corresponds to between the three o'clock position and the six o'clock position of the surface where the metal ring is located; The fourth position corresponds to between the one o'clock position and the three o'clock position of the surface where the metal ring is located.

6. The electronic device according to claim 3 or 4, wherein the first matching circuit, the second matching circuit and the third matching circuit are arranged or connected to a first sub-element so that the metal ring radiates a signal of a first target working frequency band as a circularly polarized antenna, and the current phases of two working modes of the metal ring radiating the first target working frequency band form a phase difference of 90 degrees and the signal rotates in a counterclockwise direction.

7. The electronic device according to claim 3 or 4, wherein the first matching circuit, the second matching circuit and the third matching circuit are arranged or connected to a second sub-element so that the metal ring radiates a signal of a second target working frequency band as a circularly polarized antenna, and the current phases of the two working modes of the metal ring radiating the second target working frequency band form a phase difference of 90 degrees and the signal rotates in a counterclockwise direction.

8. The electronic device according to claim 3 or 4, wherein the first matching circuit, the second matching circuit and the third matching circuit are arranged or connected to a third sub-element, so that the metal ring radiates a signal of a third target operating frequency band as a circularly polarized antenna, and the current phases of the two operating modes of the metal ring radiating the third target operating frequency band form a phase difference of 90 degrees and the signal rotates in a clockwise direction.

9. The electronic device according to claim 4, further comprising: modem; The modem is electrically connected to the first switch, the second switch and the third switch; The modem is used to control the first switch to connect or disconnect different sub-elements in the first matching circuit, control the second switch to connect or disconnect different sub-elements in the second matching circuit, and control the third switch to connect or disconnect different sub-elements in the third matching circuit.

10. A wearable device comprising an electronic device and a housing; The electronic device comprises: A closed metal ring, a circuit board, an antenna feed point, a first matching circuit, a second matching circuit, and a third matching circuit; One end of the antenna feed point is connected to the first position of the metal ring, and the other end is connected to the circuit board; one end of the first matching circuit is connected to the second position of the metal ring, and the other end is connected to the circuit board; one end of the second matching circuit is connected to the third position of the metal ring, and the other end is connected to the circuit board; one end of the third matching circuit is connected to the fourth position of the metal ring, and the other end is connected to the circuit board; The shell wraps the electronic device, and at least a portion of the shell forms the metal ring.

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