WO2021017963A1 - Wearable device - Google Patents

Abstract

A wearable device, comprising a signal processing unit and a radio frequency unit which are electrically connected. The radio frequency unit comprises a transceiver, a first circuit, a second circuit, and a double-feed antenna. The transceiver is connected to the first circuit and the second circuit respectively. The first circuit and the double-feed antenna are connected to a first feeding point, and the second circuit and the double-feed antenna are connected to a second feeding point. The double-feed antenna may transmit and receive signals through larger range of radiation fields and has excellent anti-interference ability, so as to improve the signal transmitting and receiving stability.

Description

A wearable device

This application claims the priority of a Chinese patent application filed with the Chinese Patent Office, the application number is 201910704727.0, and the application name is "a wearable device" on July 31, 2019, the entire content of which is incorporated into this application by reference.

Technical field

This application relates to the field of terminal devices, and in particular to a wearable device.

Background technique

With the development of electronic technology, wearable devices such as wireless earphones have appeared. In order to enhance the ability of the wireless headset to send and receive signals, an antenna needs to be installed in the wireless headset.

At present, there is a single-antenna earphone with an inverted F antenna at the ear handle. The radiator of the inverted F antenna is grounded through the short needle, and the feeding point of the inverted F antenna is set at the end of the radiator close to the short needle.

An inverted F antenna will produce a radiation field. In practical applications, the radiation field of an inverted-F antenna is easily affected by environmental changes. As the position of the earphone user changes and the position of people or objects in the surrounding environment changes, the radiation field of the inverted-F antenna will change, thereby affecting the stability of the earphone signal.

Summary of the invention

This application provides a wearable device that has better anti-interference ability and can improve the stability of receiving and sending signals.

In a first aspect, a wearable device is provided. The wearable device includes a signal processing unit and a radio frequency unit that are electrically connected; the radio frequency unit includes a transceiver, a first circuit, a second circuit, and a double-fed antenna; the transceivers are respectively A first circuit and a second circuit are connected, the first circuit and the double-fed antenna are connected to a first feeding point, and the second circuit and the double-fed antenna are connected to a second feeding point. The first feeding point and the second feeding point are arranged at different positions.

According to this implementation, when the signal is conducted through the first circuit and the double-fed antenna, the double-fed antenna serves as the first antenna. When the signal is conducted through the second circuit and the double-fed antenna, the double-fed antenna serves as the second antenna. The first antenna and the second antenna can provide different ranges of radiation fields. Compared with a single antenna, a double-fed antenna can transmit and receive signals through a larger range of radiation fields, so it has better anti-interference ability.

In a possible implementation manner, the radio frequency unit further includes a loading unit connected to the double-fed antenna; the loading unit is used to improve the isolation between the first circuit and the second circuit. According to this implementation, the field distribution of the antenna can be tuned by the loading unit to increase the isolation between the first circuit and the second circuit, thereby reducing signal interference between circuits, thereby improving signal quality.

In another possible implementation manner, the loading unit includes a first capacitor, a second capacitor, a third capacitor, and a fourth capacitor, and two ends of each capacitor are respectively connected to the radiator and the ground metal layer of the double-fed antenna The radiator of the double-fed antenna is respectively connected to the first capacitor, the second capacitor, the third capacitor and the fourth capacitor at a first connection point, a second connection point, and a third connection point And a fourth connection point; the first connection point, the second connection point and the first feeding point are located on a first straight line and the first feeding point is between the first connection point and the Between the second connection point; the third connection point, the fourth connection point and the second feed point are located on a second straight line and the second feed point is between the third connection point and the Between the fourth connection points, the first straight line is perpendicular to the second straight line. In this way, the isolation of the dual antenna can be improved by the loading unit with four capacitors, thereby providing a feasible solution.

In another possible implementation manner, the loading unit includes a first capacitor, a second capacitor, and a third capacitor, and both ends of each capacitor are respectively connected to the radiator and the grounded metal layer of the double-fed antenna; The radiator of the feed antenna is respectively connected to the first connection point, the second connection point and the third connection point with the first capacitor, the second capacitor and the third capacitor; the first connection point, the The second connection point and the first feed point are located on the first straight line and the first feed point is between the first connection point and the second connection point; the third connection point and the The second feeding point is located on a second straight line, and the first straight line is perpendicular to the second straight line. In this way, the isolation of the dual antenna can be improved by the loading unit with three capacitors, thereby providing another feasible solution.

In another possible implementation manner, the loading unit includes a first capacitor and a second capacitor, and both ends of each capacitor are respectively connected to the radiator and the ground metal layer of the double-fed antenna; the radiation of the double-fed antenna The body is connected with the first capacitor and the second capacitor at a first connection point and a second connection point; the first connection point and the first feeding point are located in a first straight line, and the second The connection point and the second feeding point are located on a second straight line, and the first straight line is perpendicular to the second straight line. In this way, the isolation of the dual antennas can be improved by the loading unit with two capacitors, thereby providing another feasible solution.

In another possible implementation manner, the loading unit is a capacitive component or a capacitive structure.

In another possible implementation manner, the first circuit includes a first switch, and the second circuit includes a second switch; and the signal processing unit is configured to detect the SNR of the first signal and the second switch. The signal-to-noise ratio of the signal; when the signal-to-noise ratio of the first signal is greater than or equal to the first preset threshold and the signal-to-noise ratio of the second signal is less than the second preset threshold, the first switch is connected and turned off Turn on the second switch; when the signal-to-noise ratio of the second signal is greater than or equal to a second preset threshold and the signal-to-noise ratio of the first signal is less than the first preset threshold, the second switch is connected and Turn off the first switch.

The first signal is a signal conducted through the first circuit and the double-fed antenna, and the second signal is a signal conducted through the second circuit and the double-fed antenna. When the SNR of the first signal is greater than or equal to the first preset threshold and the SNR of the second signal is less than the second preset threshold, it indicates that the signal received by the first antenna is normal but the signal received by the second antenna is poor . At this time, the first switch is connected and the second switch is disconnected, and signals can be normally sent and received through the first antenna. When the SNR of the second signal is greater than or equal to the second preset threshold and the SNR of the first signal is less than the first preset threshold, it indicates that the signal received by the second antenna is normal, but the signal received by the first antenna is poor . At this time, the second switch is connected and the first switch is disconnected, and signals can be normally sent and received through the second antenna. The present application can switch between dual antennas, and can receive signals through the other antenna when the signal received by one antenna is poor, thereby improving the stability of signal reception. Compared with a wearable device with a single antenna, the wearable device with a dual-fed antenna provided in the present application has better anti-interference ability and can enhance the ability of the wearable device to receive and transmit signals, thereby improving user experience.

A second aspect provides a wearable device, including a signal processing unit and a radio frequency unit that are electrically connected; the radio frequency unit includes: a transceiver, a first circuit, a second circuit, a dual-fed antenna, and a switch; the first circuit The double-fed antenna is connected to a first feeding point, and the second circuit and the double-fed antenna are connected to a second feeding point; the signal processing unit is used to detect the signal-to-noise ratio of the first signal And the signal-to-noise ratio of the second signal; when the signal-to-noise ratio of the first signal is greater than or equal to a first preset threshold and the signal-to-noise ratio of the second signal is less than a second preset threshold, control the The switch is in the first state. When the switch is in the first state, the transceiver is connected to the first circuit and the transceiver is disconnected from the second circuit; when the second signal is When the signal-to-noise ratio is greater than or equal to the second preset threshold and the signal-to-noise ratio of the first signal is less than the first preset threshold, the switch is controlled to be in the second state, and when the switch is in the second state, The transceiver is in communication with the second circuit and the transceiver is disconnected from the first circuit.

According to this implementation, the signal processing unit controls the switch to switch between the dual antennas, and when the signal received by one antenna is poor, the signal can be received by the other antenna, thereby improving the stability of signal reception. Moreover, compared with a wearable device with a single antenna, the wearable device with a dual-fed antenna provided in the present application has better anti-interference ability, and can enhance the ability of the wearable device to send and receive signals, thereby improving user experience.

In another possible implementation manner, the radio frequency unit further includes a loading unit connected to the double-fed antenna; the loading unit is used to reduce the operating frequency of the antenna. According to this implementation, the working frequency of the antenna can be reduced by the loading unit, so that it is feasible to install a smaller-sized antenna on the wearable device.

In another possible implementation manner, the loading unit includes a first capacitor, a second capacitor, a third capacitor, and a fourth capacitor, and two ends of each capacitor are respectively connected to the radiator and the ground metal layer of the double-fed antenna The radiator of the double-fed antenna is respectively connected to the first capacitor, the second capacitor, the third capacitor and the fourth capacitor at a first connection point, a second connection point, and a third connection point And a fourth connection point; the first connection point, the second connection point and the first feeding point are located on a first straight line and the first feeding point is between the first connection point and the Between the second connection point; the third connection point, the fourth connection point, and the second feed point are located on a second straight line and the second feed point is between the third connection point and the Between the fourth connection points, the first straight line is perpendicular to the second straight line. In this way, the operating frequency of the antenna can be reduced by the loading unit with four capacitors, thereby providing a feasible solution.

In another possible implementation manner, the loading unit includes a first capacitor, a second capacitor, and a third capacitor, and both ends of each capacitor are respectively connected to the radiator and the grounded metal layer of the double-fed antenna; The radiator of the feed antenna is respectively connected to the first connection point, the second connection point and the third connection point with the first capacitor, the second capacitor and the third capacitor; the first connection point, the The second connection point and the first feed point are located on the first straight line and the first feed point is between the first connection point and the second connection point; the third connection point and the The second feeding point is located on a second straight line, and the first straight line is perpendicular to the second straight line. In this way, the operating frequency of the antenna can be reduced by the loading unit with three capacitors, thereby providing another feasible solution.

In another possible implementation manner, the loading unit includes a first capacitor and a second capacitor, and both ends of each capacitor are respectively connected to the radiator and the ground metal layer of the double-fed antenna; the radiation of the double-fed antenna The body is connected with the first capacitor and the second capacitor at a first connection point and a second connection point; the first connection point and the first feeding point are located in a first straight line, and the second The connection point and the second feeding point are located on a second straight line, and the first straight line is perpendicular to the second straight line. In this way, the operating frequency of the antenna can be reduced by the loading unit with two capacitors, thereby providing another feasible solution.

In another possible implementation manner, the loading unit is a capacitive component or a capacitive structure.

A third aspect provides a radio frequency unit. The radio frequency unit includes a transceiver, a first circuit, a second circuit, and a double-fed antenna; the transceiver is connected to the first circuit and the second circuit, and the first circuit is connected to the The double-fed antenna is connected to a first feeding point, and the second circuit and the double-fed antenna are connected to a second feeding point. The first feeding point and the second feeding point are arranged at different positions.

Description of the drawings

Figure 1 is a schematic diagram of a wearable device in an embodiment of the application;

FIG. 2 is another schematic diagram of the wearable device in the embodiment of the application;

FIG. 3 is a schematic diagram of a double-fed antenna in an embodiment of the application;

FIG. 4 is a schematic diagram of a radio frequency unit in an embodiment of the application;

5 is a schematic diagram of the position of the feeding point and the position of the connection point in the embodiment of the application;

Fig. 6 is an antenna pattern of the double-fed antenna in the embodiment of the application;

FIG. 7 is a schematic diagram of S11 parameters, S22 parameters and S12 parameters in an embodiment of the application;

FIG. 8 is another schematic diagram of the radio frequency unit in the embodiment of the application;

FIG. 9 is another schematic diagram of the wearable device in the embodiment of the application.

Detailed ways

This application provides a wearable device with a dual-fed antenna. The wearable device can be, but is not limited to, earphones, bracelets, or watches. The wearable device may communicate with other communication devices through a wireless communication module, and the wireless communication module may be but not limited to a Bluetooth module.

Double-fed antenna refers to two antennas that share the same radiator. In actual application scenarios, the two antennas have different directivity patterns when working, so the signal-to-noise ratio will also be different. The wearable device can dynamically select the one with better signal-to-noise ratio among the two antennas as the transmitting and receiving antenna during use. Compared with the fixed single antenna, better communication quality can be obtained.

The wearable device with dual-fed antennas in this application will be introduced below. Referring to Fig. 1, an embodiment of the wearable device provided by this application includes:

The signal processing unit 10 and the radio frequency unit 20; the signal processing unit 10 and the radio frequency unit 20 are electrically connected. The signal processing unit 10 may be, but is not limited to, a digital signal processing (digital signal processing, DSP) chip. The signal processing unit 10 and the radio frequency unit 20 may be integrated in a Bluetooth module.

Referring to FIG. 2, the radio frequency unit 20 includes a transceiver 201, a first circuit 202, a second circuit 203 and a double-fed antenna 204. The transceiver 201 is connected to the first circuit 202 and the second circuit 203 respectively. The first circuit 202 and the double-fed antenna 204 are connected to the first feeding point FP1, and the second circuit 203 and the double-fed antenna 204 are connected to the second feeding point FP2.

The transceiver 201 is used to receive or transmit signals. Specifically, the signal processing unit 10 is electrically connected to the transceiver 201, and the signal processing unit 10 can process the signal from the transceiver 201.

The first circuit 202 and the second circuit 203 are microstrip lines, or the first circuit 202 and the second circuit 203 are coaxial feed lines.

The first feeding point FP1 and the second feeding point FP2 are set at different positions, and the distance between the two feeding points can be set according to the actual situation, which is not limited here.

Referring to FIG. 3, the dual-fed antenna 204 includes a radiator 301, a dielectric substrate 302 and a grounded metal layer 303. Specifically, the first circuit 202 and the radiator 301 are connected to the first feeding point FP1, and the second circuit 203 and the radiator 301 are connected to the second feeding point FP2. It can be understood that the first circuit 202 and the second circuit 203 shown in FIG. 3 are feeders connected to the radiator 301 in the first circuit 202 and the second circuit 203, and other parts are not shown.

The radiator 301 may be, but is not limited to, a metal sheet, such as a copper sheet. The shape of the radiator 301 may be a symmetrical figure, such as a circle, a regular polygon, a triangle, an ellipse, a rectangle, or a rhombus. The shape of the radiator 301 may also be an asymmetrical figure. The dielectric substrate 302 may be an insulating material, such as FR-4 material (also called epoxy glass cloth-based material). The ground metal layer 303 serves as a ground (GND) in the circuit. The size and height of the radiator 301 are related to the frequency of the signal conducted by it. For example, the radiator 301 is a circular metal sheet, and when the frequency of its conducting signal is 2.4 GHz, the diameter of the circular metal sheet may be 16 mm. In the case where the diameter of the circular metal sheet may be 16 mm, the thickness of the dielectric substrate 302 may be 3 mm. For another example, the radiator 301 is a circular metal sheet, and when the frequency of its conduction signal is 2.4 GHz, the diameter of the circular metal sheet may be 16 mm, and the thickness of the dielectric substrate may be 1.8 mm. It can be understood that the above examples are for ease of understanding, and are not intended to limit the radiator 301 and the medium substrate 302. The height and diameter of the circular metal sheet and the thickness of the media substrate can be set according to the actual situation.

The wearable device may further include a housing and a circuit board, and the circuit board is arranged inside the housing. The signal processing unit 10, the transceiver 201, the first circuit 202, the second circuit 203, and the double-fed antenna 204 can all be arranged on a circuit board. Wherein, the double-fed antenna 204 may not be arranged on the circuit board, but may be arranged in other positions of the housing. At this time, the feeder connected to the double-fed antenna 204 in the first circuit 202 and the second circuit 203 may not be arranged at Circuit board.

In this embodiment, when the signal is conducted through the first circuit 202 and the double-fed antenna 204, the double-fed antenna 204 serves as the first antenna. When the signal is conducted through the second circuit 203 and the double-fed antenna 204, the double-fed antenna 204 serves as the second antenna. The first antenna and the second antenna can provide different ranges of radiation fields. Compared with a single antenna, the double-fed antenna 204 can transmit and receive signals through a larger range of radiation fields, and therefore has better anti-interference ability.

In an optional embodiment, the radio frequency unit 20 further includes a loading unit connected to the double-fed antenna 204; the loading unit is used to improve the isolation between the first circuit and the second circuit. The loading unit can be implemented in a variety of ways, which will be introduced separately in the following embodiments:

Referring to FIG. 4, in an alternative embodiment, the loading unit includes a first capacitor C1, a second capacitor C2, a third capacitor C3, and a fourth capacitor C4. Both ends of each capacitor are connected to the radiator of the double-fed antenna 204. 301 and GND (ie, grounded metal layer 303); the radiator 301 is connected to the first capacitor C1, the second capacitor C2, the third capacitor C3, and the fourth capacitor C4 at the first connection point P1, the second connection point P2, and the Three connection points P3 and fourth connection point P4.

5, the first connection point P1, the second connection point P2, and the first feeding point FP1 are located in the first straight line, and the first feeding point FP1 is between the first connection point P1 and the second connection point P2; The three connection point P3, the fourth connection point P4, and the second feed point FP2 are located on the second straight line, and the second feed point FP2 is between the third connection point P3 and the fourth connection point P4. Two straight lines are vertical.

In this embodiment, the first circuit 202 needs to excite a high-frequency current in a half-wavelength mode on the radiator 301, such as 2.4 GHz. The radiator takes a disk as an example. The high-frequency current of the half-wavelength mode resonating on the radiator has a composite current (because the current distribution has countless paths on the plane) direction along the first connection point P1 and the second connection point The first linear direction formed by P2 and the first feeding point FP1. Because the size of the wearable device is generally small, the diameter of the disc may be much smaller than half of the conduction wavelength, which makes the antenna operating frequency higher. C1 and C2 are used as capacitive loading at the end of the first antenna to make the first antenna work The frequency shifts to low frequency (because the antenna is equivalent to an LC resonator, increasing the capacitance value (that is, the capacitance value) in a large voltage area can make the resonant frequency lower). Tuning the capacitance of C1 and C2 can change the position of the maximum current point of the first antenna. When C1=C2, the maximum current point of the first antenna is located at the midpoint of C1 and C2, that is, the center of the circle, and the minimum current point of the first antenna is located at both ends of the first straight line, namely C1 and C2. At the same time, each line of the current maximum point on the current path between C1 and C2 is perpendicular to the first straight line, and the intersection is at the center of the circle. Therefore, the intersection position is adjustable.

Similarly, the third capacitor C3 and the fourth capacitor C4 can shift the operating frequency of the second antenna to a low frequency. Moreover, tuning the capacitance values of C3 and C4 can change the position of the maximum current point of the second antenna, thereby changing the field distribution of the second antenna.

The angle between the first straight line and the second straight line affects the isolation between the first antenna and the second antenna. When the first straight line is perpendicular to the second straight line, the value of the isolation between the first antenna and the second antenna is the largest.

It should be noted that the GND connected to the first capacitor C1, the second capacitor C2, the third capacitor C3, and the fourth capacitor C4 can all be implemented by the ground metal layer 303.

Optionally, the first capacitor C1, the second capacitor C2, the third capacitor C3, and the fourth capacitor C4 may all be adjustable capacitors.

By changing the field distribution of the first antenna and the second antenna, the isolation between the first circuit 202 and the second circuit 203 can be improved. The following is a detailed introduction:

In an alternative embodiment, the capacitance of the first capacitor C1 is equal to the capacitance of the second capacitor C2, and the capacitance of the third capacitor C3 is equal to the capacitance of the fourth capacitor C4. The distance from the first feeding point FP1 to the first midpoint is equal to one-fourth of the first distance, the first distance is the linear distance from the first connection point P1 to the second connection point P2, and the first midpoint is the first connection The midpoint between point P1 and the second connection point P2; the distance from the second feeding point FP2 to the second midpoint is equal to one-fourth of the second distance, which is the third connection point P3 to the fourth connection The linear distance of the point P4, the second midpoint is the midpoint between the third connection point P3 and the fourth connection point P4.

In this way, in an ideal situation P1, P2, and FP1 are all in the electric field null area of the second antenna, and P3, P4, and FP2 are all in the electric field null area of the first antenna. The value of the induced current generated by the first circuit 202 on the radiator 301 at P3, P4 and FP2 is less than the preset current value, that is, the induced current is extremely weak. The value of the induced current generated by the second circuit 203 on the radiator 301 at P1, P2 and FP1 is less than the preset current value, and the induced current is extremely weak. In this way, the isolation between the first circuit 202 and the second circuit 203 is greater than the preset isolation.

In practical applications, the distance from the first feeding point FP1 to the first midpoint can be approximately equal to one-quarter of the first distance, and the distance from the second feeding point FP2 to the second midpoint can be approximately equal to that of the second distance. A quarter.

The following takes the radio frequency unit 20 shown in FIG. 4 as an example, and its working frequency is 2.4-2.5 GHz. The radio frequency unit 20 transmits signals of different frequencies for testing. The test results are shown in Table 1:

Test frequency point number	frequency	Reverse transmission coefficient S12
1	698MHz	-1.8649dB
2	791MHz	-2.0964dB
3	824MHz	-2.2644dB
4	960MHz	-3.0906dB
5	1.71GHz	-9.9520dB
6	2.17GHz	-17.132dB
7	2.50GHz	-22.659dB
8	2.40GHz	-23.322dB
9	2.45GHz	-23.595dB

Table 1

As can be seen from Table 1, good isolation has been achieved at its operating frequency of 2.4 ~ 2.5 GHz. The isolation degree can be the absolute value of the reverse transmission coefficient S12. The greater the value of isolation, the smaller the signal interference between the first circuit 202 and the second circuit 203, and the smaller the value of isolation, the greater the signal interference between the first circuit 202 and the second circuit 203.

The double-fed antenna 204 can be used as the first antenna and the second antenna. FIG. 6 is a pattern of the first antenna and the second antenna on the YOZ plane, and the YOZ plane is the plane where the radiator is located. Referring to FIG. 6, the antenna pattern of the first antenna and the antenna pattern of the second antenna have obvious complementary characteristics, and the radiation directions of the first antenna and the second antenna are close to orthogonal.

Fig. 7 shows the curve of the S parameter from the first circuit to the second circuit. S parameters are also called scattering parameters, and S parameters include S11, S22, and S12. S11 is the input reflection coefficient, also known as the input return loss. S22 is the output reflection coefficient, also known as the output return loss.

In the coordinate system of Figure 7, the vertical axis is used to indicate the amplitude of the S parameter, in decibels (dB), and the horizontal axis is used to indicate frequency, in megahertz (MHz), and 1 to 9 in Figure 7 indicate the test Frequency point number. It can be seen that when the frequency of the transceiver signal is in the 2.4GHz ~ 2.5GHz frequency band, the S12 of the double-fed antenna 204 is lower than -22dB, which means that the signal strength from the first circuit 202 to the second circuit 203 is only 0.6% of the initial value From left to right, the signal received and received through the first antenna interferes very little with the signal received and received by the second antenna, which can meet the isolation requirements. Similarly, the signal received and received through the second antenna has very little interference to the signal received and received by the first antenna.

In practical applications, the first connection point P1, the second connection point P2 and the first feeding point FP1 may not be in a straight line, and a certain deviation is allowed. In the same way, the third connection point P3, the fourth connection point P4, and the second feed point FP2 may not be in a straight line, and a certain deviation is allowed. The angle between the first straight line and the second straight line is not necessarily a right angle, and a certain deviation is allowed.

In another optional embodiment, the loading unit includes a first capacitor C1, a second capacitor C2, and a third capacitor C3. The two ends of each capacitor are respectively connected to the radiator 301 and the grounded metal layer 303 of the double-fed antenna 204; The radiator 301 of the feed antenna 204 is connected to the first connection point P1, the second connection point P2 and the third connection point P3 with the first capacitor C1, the second capacitor C2 and the third capacitor C3, respectively; The second connection point P2 and the first feed point FP1 are located on the first straight line and the first feed point FP1 is between the first connection point P1 and the second connection point P2; the third connection point P3 and the second feed point FP2 Located on the second straight line, the first straight line is perpendicular to the second straight line.

In this embodiment, the first capacitor C1 and the second capacitor C2 can shift the operating frequency of the first antenna to a low frequency, and the third capacitor C3 can shift the operating frequency of the second antenna to a low frequency. Setting the first capacitor C1, the second capacitor C2, and the third capacitor C3 in this way can shift the antenna operating frequency to low frequency, which solves the problem that the operating frequency of a small-size antenna may be too high, so that a small size can be installed on a wearable device The antenna is feasible.

Tuning the capacitance of the first capacitor C1 and the second capacitor C2 can change the field distribution of the first antenna. Tuning the capacitance of the third capacitor C3 can change the field distribution of the second antenna. When P1, P2, and FP1 are located in the electric field zero area of the second antenna, and P3 and FP2 are located in the electric field zero area of the first antenna, the current of the first circuit 202 on the radiator 301 will not induce current in P3 and FP2. The current of the second circuit 203 on the radiator 301 does not generate induced currents in P1, P2, and FP1, so that the isolation between the first circuit 202 and the second circuit 203 can be improved.

In another optional embodiment, the loading unit includes a first capacitor C1 and a second capacitor C2, and the two ends of each capacitor are respectively connected to the radiator 301 and the ground metal layer 303 of the double-fed antenna 204; the radiation of the double-fed antenna 204 The body 301 is respectively connected to the first connection point P1 and the second connection point P2 with the first capacitor C1 and the second capacitor C2; the first connection point P1 and the first feeding point FP1 are located in the first straight line, and the second connection point P2 And the second feeding point FP2 are located in a second straight line, and the first straight line is perpendicular to the second straight line.

In this embodiment, the first capacitor C1 can shift the operating frequency of the first antenna to a low frequency, and the second capacitor C2 can shift the operating frequency of the second antenna to a low frequency. Setting the first capacitor C1 and the second capacitor C2 in this way can shift the antenna operating frequency to low frequency, which solves the problem that the operating frequency of a small antenna may be too high, so that it is feasible to install a smaller antenna on a wearable device Sex.

Tuning the capacitance of the first capacitor C1 can change the field distribution of the first antenna, and tuning the capacitance of the second capacitor C2 can change the field distribution of the second antenna. When P1 and FP1 are located in the electric field zero area of the second antenna, and P2 and FP2 are located in the electric field zero area of the first antenna, the current of the first circuit 202 on the radiator 301 will not induce current in P2 and FP2. The current of the circuit 203 on the radiator 301 does not generate induced currents in P1 and FP1, so that the isolation between the first circuit 202 and the second circuit 203 can be improved.

In this application, field distribution refers to the distribution of electric field.

In another alternative embodiment, the loading unit is a capacitive component or a capacitive structure.

Referring to FIG. 8, in another alternative embodiment, the first circuit 202 includes a first switch K1, and the second circuit 203 includes a second switch K2;

The signal processing unit 10 is electrically connected to the first switch K1 and the second switch K2, respectively. The signal processing unit 10 is used to detect the signal-to-noise ratio of the first signal and the signal-to-noise ratio of the second signal. The first signal is the signal conducted through the first circuit and the double-fed antenna, and the second signal is the signal that passes through the second circuit and the double-fed antenna. Feed the signal conducted by the antenna; when the SNR of the first signal is greater than or equal to the first preset threshold and the SNR of the second signal is less than the second preset threshold, the first switch is connected and the second switch is disconnected; when When the SNR of the second signal is greater than or equal to the second preset threshold and the SNR of the first signal is less than the first preset threshold, the second switch is connected and the first switch is disconnected.

When the first signal is a signal received by the first antenna, the first signal is transmitted to the signal processing unit 10 through the first circuit 202 and the transceiver 201, and the signal processing unit 10 can detect the signal-to-noise ratio of the first signal. When the SNR of the first signal is greater than or equal to the first preset threshold and the SNR of the second signal is less than the second preset threshold, it indicates that the signal received by the first antenna is normal but the signal received by the second antenna is poor . At this time, the first switch K1 is connected and the second switch K2 is disconnected, and signals can be normally sent and received through the first antenna. When the SNR of the second signal is greater than or equal to the second preset threshold and the SNR of the first signal is less than the first preset threshold, it indicates that the signal received by the second antenna is normal, but the signal received by the first antenna is poor . At this time, the second switch K2 is connected and the first switch K1 is disconnected, and signals can be normally sent and received through the second antenna.

It should be noted that the signal processing unit 10 can also detect the throughput rate of the first antenna and the throughput rate of the second antenna; when the throughput rate of the first antenna is greater than or equal to the first preset throughput rate and the throughput rate of the second antenna is less than When the second preset throughput rate is turned on, the first switch is connected and the second switch is turned off; when the throughput rate of the second antenna is greater than or equal to the second preset throughput rate and the throughput rate of the first antenna is less than the first preset throughput rate , Connect the second switch and disconnect the first switch.

Alternatively, the signal processing unit 10 may also detect the signal strength of the first signal and the signal strength of the second signal; when the signal strength of the first signal is greater than or equal to the first preset signal strength and the signal strength of the second signal is less than the second preset signal strength. When the signal strength is set, the first switch is connected and the second switch is disconnected; when the signal strength of the second signal is greater than or equal to the second preset signal strength and the signal strength of the first signal is less than the first preset signal strength, the first switch is connected Two switches and open the first switch.

It can be seen that the present application can switch between dual antennas, and can receive signals through the other antenna when the signal received by one antenna is not good, thereby improving the stability of signal reception. Compared with a wearable device with a single antenna, the wearable device with a dual-fed antenna provided in the present application has better anti-interference ability and can enhance the ability of the wearable device to receive and transmit signals, thereby improving user experience.

The above describes the solution in which the signal processing unit 10 controls the first switch K1 and the second switch K2 to perform antenna switching. The following describes the solution in which the signal processing unit 10 controls and controls a switch to perform antenna switching.

Referring to FIG. 9, another embodiment of the wearable device provided by the present application includes:

Signal processing unit 10 and radio frequency unit 20;

The radio frequency unit 20 includes: a transceiver 901, a first circuit 902, a second circuit 903, a double-fed antenna 904, and a switch 905; the first circuit 902 and the double-fed antenna 904 are connected to the first feeding point FP1, and the second circuit 903 The double-fed antenna 904 is connected to the second feeding point FP2; the signal processing unit 10 is electrically connected to the transceiver 901 and the switch 905;

The signal processing unit 10 is used to detect the signal-to-noise ratio of the first signal and the signal-to-noise ratio of the second signal when the first signal is a received signal. The first signal is a signal conducted through the first circuit and the double-fed antenna, and the second The signal is a signal conducted through the second circuit and the double-fed antenna; when the SNR of the first signal is greater than or equal to the first preset threshold and the SNR of the second signal is less than the second preset threshold, the switch 905 is controlled In the first state, when the switch 905 is in the first state, the transceiver 901 is connected to the first circuit 902 and the transceiver 901 is disconnected from the second circuit 903; when the SNR of the second signal is greater than or equal to the second preset When the threshold is set and the signal-to-noise ratio of the first signal is less than the first preset threshold, the switch 905 is controlled to be in the second state. When the switch 905 is in the second state, the transceiver 901 is connected to the second circuit 903 and the transceiver 901 It is disconnected from the first circuit 902.

The structure and connection relationship of the transceiver 901, the first circuit 902, the second circuit 903, and the double-fed antenna 904 are similar to those of the transceiver 201, the first circuit 202, the second circuit 203, and the double-fed antenna 204, respectively. For details, please refer to The relevant records in the previous article. The first feeding point FP1 and the second feeding point FP2 are the same as the first feeding point FP1 and the second feeding point FP2 in the foregoing. The double-fed antenna 904 includes a radiator, a dielectric substrate, and a grounded metal layer. For details of the radiator, dielectric substrate and grounding metal layer, please refer to the relevant records in the preceding text, which will not be repeated here.

In this embodiment, the signal processing unit 10 controls the switch 905 to switch between dual antennas, and when the signal received by one antenna is poor, the signal can be received by the other antenna, thereby improving the stability of signal reception. Moreover, compared with a wearable device with a single antenna, the wearable device with a dual-fed antenna provided in the present application has better anti-interference ability, and can enhance the ability of the wearable device to send and receive signals, thereby improving user experience.

In an optional embodiment, the radio frequency unit 20 further includes a loading unit connected to the double-fed antenna 904; the loading unit is used to reduce the operating frequency of the antenna.

In an optional embodiment, the loading unit includes a first capacitor C1, a second capacitor C2, a third capacitor C3, and a fourth capacitor C4, and both ends of each capacitor are connected to the radiator of the double-fed antenna 904 and the grounded metal layer. The radiator of the double-fed antenna 904 is connected to the first connection point P1, the second connection point P2, the third connection point P3, and the first capacitor C1, the second capacitor C2, the third capacitor C3, and the fourth capacitor C4, respectively Four connection points P4; the first connection point P1, the second connection point P2, and the first feed point FP1 are located on the first straight line, and the first feed point FP1 is between the first connection point P1 and the second connection point P2; The third connection point P3, the fourth connection point P4, and the second feeding point FP2 are located on the second straight line and the second feeding point FP2 is between the third connection point P3 and the fourth connection point P4. Two straight lines are vertical.

In this embodiment, the first capacitor C1 and the second capacitor C2 can shift the operating frequency of the first antenna to a low frequency, and the third capacitor C3 can shift the operating frequency of the second antenna to a low frequency. Setting the first capacitor C1, the second capacitor C2, and the third capacitor C3 in this way can shift the antenna operating frequency to low frequency, which solves the problem that the operating frequency of a small-size antenna may be too high, so that a small size can be installed on a wearable device The antenna is feasible.

Optionally, the first capacitor C1, the second capacitor C2, the third capacitor C3, and the fourth capacitor C4 are all adjustable capacitors. Optionally, the capacitance of the first capacitor C1 is equal to the capacitance of the second capacitor C2, and the capacitance C3 of the third capacitor is equal to the capacitance C4 of the fourth capacitor.

In another alternative embodiment, the loading unit includes a first capacitor C1, a second capacitor and a third capacitor C3, and the two ends of each capacitor are respectively connected to the radiator and the ground metal layer of the double-fed antenna 904; the double-fed antenna 904 The radiator is connected to the first connection point P1, the second connection point P2 and the third connection point P3 with the first capacitor C1, the second capacitor C2 and the third capacitor C3 respectively; the first connection point P1 and the second connection point P2 And the first feeding point FP1 are located in the first straight line and the first feeding point FP1 is between the first connection point P1 and the second connection point P2; the third connection point P3 and the second feeding point FP2 are located in the second straight line , The first straight line is perpendicular to the second straight line.

In this embodiment, the first capacitor C1 and the second capacitor C2 can shift the operating frequency of the first antenna to a low frequency, and the third capacitor C3 can shift the operating frequency of the second antenna to a low frequency. Setting the first capacitor C1, the second capacitor C2, and the third capacitor C3 in this way can shift the antenna operating frequency to low frequency, which solves the problem that the operating frequency of a small-size antenna may be too high, so that a small size can be installed on a wearable device The antenna is feasible. In this way, the operating frequency of the antenna can be reduced by the loading unit with three capacitors, thereby providing another feasible solution.

In another alternative embodiment, the loading unit includes a first capacitor C1 and a second capacitor C2, and the two ends of each capacitor are respectively connected to the radiator of the double-fed antenna 904 and the ground metal layer; The first capacitor C1 and the second capacitor C2 are connected to the first connection point P1 and the second connection point P2; the first connection point P1 and the first feeding point FP1 are located in the first straight line, and the second connection point P2 and the second The feeding point FP2 is located on the second straight line, and the first straight line is perpendicular to the second straight line.

In this embodiment, the first capacitor C1 can shift the operating frequency of the first antenna to a low frequency, and the second capacitor C2 can shift the operating frequency of the second antenna to a low frequency. Setting the first capacitor C1 and the second capacitor C2 in this way can shift the antenna operating frequency to low frequency, which solves the problem that the operating frequency of a small antenna may be too high, so that it is feasible to install a smaller antenna on a wearable device Sex. In this way, the operating frequency of the antenna can be reduced by the loading unit with two capacitors, thereby providing another feasible solution.

In another alternative embodiment, the loading unit is a capacitive component or a capacitive structure.

The above embodiments are only used to illustrate the technical solutions of the application, but not to limit them; although the application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still compare the previous embodiments. The recorded technical solutions are modified, or some of the technical features are equivalently replaced; these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims (13)

1. A wearable device includes a signal processing unit and a radio frequency unit that are electrically connected, wherein the radio frequency unit includes:

   The transceiver, the first circuit, the second circuit and the double-fed antenna; the transceiver is connected to the first circuit and the second circuit respectively, the first circuit and the double-fed antenna are connected to the first feeding point, the The second circuit and the double-fed antenna are connected to a second feeding point.
2. The wearable device according to claim 1, wherein the radio frequency unit further comprises a loading unit connected to the double-fed antenna;

   The loading unit is used to improve the isolation between the first circuit and the second circuit.
3. The wearable device according to claim 2, wherein:

   The loading unit includes a first capacitor, a second capacitor, a third capacitor and a fourth capacitor, and both ends of each capacitor are respectively connected to the radiator and the ground metal layer of the double-fed antenna;

   The radiator of the double-fed antenna is connected to the first capacitor, the second capacitor, the third capacitor, and the fourth capacitor at a first connection point, a second connection point, a third connection point and Fourth connection point

   The first connection point, the second connection point, and the first feed point are located on a first straight line and the first feed point is between the first connection point and the second connection point ；

   The third connection point, the fourth connection point, and the second feed point are located on a second straight line and the second feed point is between the third connection point and the fourth connection point, The first straight line is perpendicular to the second straight line.
4. The wearable device according to claim 2, wherein:

   The loading unit includes a first capacitor, a second capacitor, and a third capacitor. Both ends of each capacitor are connected to the radiator of the double-fed antenna and the ground metal layer; The first capacitor, the second capacitor and the third capacitor are connected to a first connection point, and the second connection point and the third connection point;

   The first connection point, the second connection point, and the first feed point are located on a first straight line and the first feed point is between the first connection point and the second connection point The third connection point and the second feed point are located in a second straight line, and the first straight line is perpendicular to the second straight line.
5. The wearable device according to claim 2, wherein:

   The loading unit includes a first capacitor and a second capacitor, and the two ends of each capacitor are respectively connected to the radiator of the double-fed antenna and the ground metal layer; the radiator of the double-fed antenna is connected to the first capacitor and The second capacitor is connected to the first connection point and the second connection point.
6. The wearable device according to claim 2, wherein the loading unit is a capacitive component or a capacitive structure.
7. The wearable device according to any one of claims 1 to 6, wherein:

   The first circuit includes a first switch, and the second circuit includes a second switch;

   The signal processing unit is used to detect the signal-to-noise ratio of the first signal and the signal-to-noise ratio of the second signal, the first signal is a signal conducted through the first circuit and the double-fed antenna, so The second signal is a signal conducted through the second circuit and the double-fed antenna; when the signal-to-noise ratio of the first signal is greater than or equal to a first preset threshold and the signal-to-noise ratio of the second signal is less than When the second preset threshold is connected, the first switch is connected and the second switch is disconnected; when the SNR of the second signal is greater than or equal to the second preset threshold and the SNR of the first signal When the value is less than the first preset threshold, the second switch is connected and the first switch is disconnected.
8. A wearable device includes a signal processing unit and a radio frequency unit that are electrically connected, and is characterized in that:

   The radio frequency unit includes: a transceiver, a first circuit, a second circuit, a double-fed antenna, and a switch; the first circuit and the double-fed antenna are connected to a first feeding point, and the second circuit is connected to the The double-fed antenna is connected to the second feeding point;

   The signal processing unit is used to detect the signal-to-noise ratio of the first signal and the signal-to-noise ratio of the second signal, and the first signal is a signal conducted through the first circuit and the double-fed antenna, The second signal is a signal conducted through the second circuit and the double-fed antenna; when the signal-to-noise ratio of the first signal is greater than or equal to a first preset threshold and the signal-to-noise ratio of the second signal When the value is less than the second preset threshold, the switch is controlled to be in the first state. When the switch is in the first state, the transceiver and the first circuit are connected and the transceiver and the second The circuit is disconnected; when the signal-to-noise ratio of the second signal is greater than or equal to the second preset threshold and the signal-to-noise ratio of the first signal is less than the first preset threshold, the switch is controlled to be in the second state, When the switch is in the second state, the transceiver is connected to the second circuit and the transceiver is disconnected from the first circuit.
9. The wearable device according to claim 8, wherein the radio frequency unit further comprises a loading unit connected to the double-fed antenna;

   The loading unit is used to reduce the working frequency of the antenna.
10. The wearable device according to claim 9, wherein:

    The loading unit includes a first capacitor, a second capacitor, a third capacitor and a fourth capacitor, and both ends of each capacitor are respectively connected to the radiator and the ground metal layer of the double-fed antenna;

    The radiator of the double-fed antenna is connected to the first capacitor, the second capacitor, the third capacitor, and the fourth capacitor at a first connection point, a second connection point, a third connection point and Fourth connection point

    The first connection point, the second connection point, and the first feed point are located on a first straight line and the first feed point is between the first connection point and the second connection point ；

    The third connection point, the fourth connection point, and the second feed point are located on a second straight line, and the second feed point is between the third connection point and the fourth connection point, The first straight line is perpendicular to the second straight line.
11. The wearable device according to claim 9, wherein:

    The loading unit includes a first capacitor, a second capacitor, and a third capacitor. The two ends of each capacitor are respectively connected to the radiator of the double-fed antenna and the grounding metal layer; the radiator of the double-fed antenna is connected to the The first capacitor, the second capacitor and the third capacitor are connected to a first connection point, and the second connection point and the third connection point;

    The first connection point, the second connection point, and the first feed point are located on a first straight line and the first feed point is between the first connection point and the second connection point The third connection point and the second feed point are located in a second straight line, and the first straight line is perpendicular to the second straight line.
12. The wearable device according to claim 9, wherein:

    The loading unit includes a first capacitor and a second capacitor, and the two ends of each capacitor are respectively connected to the radiator of the double-fed antenna and the ground metal layer; the radiator of the double-fed antenna is connected to the first capacitor and The second capacitor is connected to the first connection point and the second connection point;

    The first connection point and the first feeding point are located on a first straight line, the second connection point and the second feeding point are located on a second straight line, and the first straight line is connected to the second straight line. The straight line is vertical.
13. The wearable device according to claim 9, wherein the loading unit is a capacitive component or a capacitive structure.

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