Antenna touch multiplexing device, earphone and electronic device

Abstract

The application discloses an antenna touch multiplexing device, earphones and electronic equipment. The antenna touch multiplexing device comprises an antenna, a touch signal transmission path, a radio frequency signal transmission path, a touch chip and a radio frequency chip. The touch signal transmission path connects the antenna and the touch chip. The radio frequency signal transmission path connects the antenna and the radio frequency chip. The touch signal transmission path comprises a first low-pass filter module and a second low-pass filter module connected in series between the antenna and the touch chip, the wiring distance between the first low-pass filter module and the antenna is less than the wiring distance between the first low-pass filter module and the second low-pass filter module; and the wiring distance between the second low-pass filter module and the touch chip is less than the wiring distance between the first low-pass filter module and the second low-pass filter module. In the above manner, the application can reduce the influence of the coupling between the touch signal transmission path and the radio frequency signal on the touch performance, and optimize the touch performance.

Description

[Technical Field]

[0001] This application relates to the field of electronic device technology, and in particular to antenna touch multiplexing devices, headphones, and electronic devices. [Background Technology]

[0002] In some wireless communication devices such as wireless headphones, it is often necessary to simultaneously possess radio frequency (RF) communication and touch control functions. In related technologies, antennas are used to transmit and receive RF signals, and can also function as touch electrodes to achieve antenna-touch multiplexing. However, in current antenna-touch multiplexing devices, when transmitting RF signals, the RF signals couple with the touch signal transmission path, leading to a deterioration in touch performance. [Utility Model Content]

[0003] Embodiments of this application provide an antenna touch multiplexing device, headphones, and electronic devices, which can reduce the impact of the coupling between the touch signal transmission path and the radio frequency signal on touch performance and optimize touch performance.

[0004] In a first aspect, embodiments of this application provide an antenna touch multiplexing device. The antenna touch multiplexing device includes an antenna, a touch signal transmission path, a radio frequency (RF) signal transmission path, a touch chip, and an RF chip. The touch signal transmission path is connected to the antenna and is used to transmit touch signals. The RF signal transmission path is connected to the antenna and is used to transmit RF signals. The touch chip is connected to the antenna via the touch signal transmission path. The RF chip is connected to the antenna via the RF signal transmission path. The touch signal transmission path includes a first low-pass filter module and a second low-pass filter module connected in series between the antenna and the touch chip. The trace distance between the first low-pass filter module and the antenna is less than the trace distance between the first low-pass filter module and the second low-pass filter module; the trace distance between the second low-pass filter module and the touch chip is less than the trace distance between the first low-pass filter module and the second low-pass filter module.

[0005] Secondly, embodiments of this application provide an earphone. The earphone includes the aforementioned antenna touch multiplexing device, housing, and support assembly. The antenna touch multiplexing device is disposed within the housing and close to the housing. The support assembly supports the housing and the antenna touch multiplexing device when worn in the wearing position.

[0006] Thirdly, embodiments of this application provide an electronic device. The electronic device includes the antenna touch multiplexing device described above.

[0007] The beneficial effects of this application are as follows: Unlike existing technologies, the touch chip is connected to the antenna via a touch signal transmission path. The radio frequency (RF) chip is connected to the antenna via an RF transmission path. The antenna can transmit RF signals and also function as a touch electrode. This configuration integrates antenna and touch functions, making the antenna touch multiplexing device more compact and reducing the spatial conflicts in electronic devices such as headphones using this application's antenna touch multiplexing device. In the embodiment of this application's antenna touch multiplexing device, the touch signal transmission path includes a first low-pass filter module and a second low-pass filter module connected in series. The trace distance between the first low-pass filter module and the antenna is less than the trace distance between the first and second low-pass filter modules. The trace distance between the second low-pass filter module and the touch chip is less than the trace distance between the first and second low-pass filter modules. In other words, the first low-pass filter module is positioned closer to the antenna, and the second low-pass filter module is positioned closer to the touch chip. This configuration allows the first low-pass filter module to block RF signals in the antenna touch multiplexing device, reducing interference with the touch chip. The second low-pass filter module further blocks the radio frequency (RF) signal, further reducing RF interference to the touch signal. Because the first low-pass filter module is positioned close to the antenna and the second low-pass filter module is positioned close to the touch chip, the RF signal radiated by the antenna is less likely to couple with the traces between the first and second low-pass filter modules and the antenna, ensuring the reliability of the touch performance. Furthermore, the signal generated after coupling between the traces between the first and second low-pass filter modules and the RF signal radiated by the antenna is blocked by the first and second low-pass filter modules from both ends of the traces. The coupling between the traces between the first and second low-pass filter modules and the RF signal does not affect the touch chip or the RF chip, allowing for flexible arrangement of the relative positions of the antenna and the touch chip, optimizing the spatial layout of the antenna-touch multiplexing device. [Attached Image Description]

[0008] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. Furthermore, these drawings and textual descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concepts of this application to those skilled in the art through reference to specific embodiments.

[0009] Figure 1 This is a schematic diagram of an embodiment of the electronic device of this application;

[0010] Figure 2 This is a schematic diagram of an embodiment of the earphone in this application;

[0011] Figure 3 yes Figure 2 The diagram shows the headphones being worn.

[0012] Figure 4 This is a schematic diagram of the antenna touch multiplexing device of this application;

[0013] Figure 5 yes Figure 4 A schematic diagram of an implementation of the antenna touch multiplexing device is shown.

[0014] Figure 6 This is a schematic diagram of the antenna touch multiplexing device of this application;

[0015] Figure 7 yes Figure 6 The diagram shows an embodiment of the antenna touch multiplexing device.

Detailed Implementation Methods

[0016] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the embodiments of this application. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0017] See Figure 1 This application provides an electronic device 1. The electronic device 1 includes an antenna touch multiplexing device 100. The electronic device 1 can be a wireless headset, smart bracelet, smartwatch, smart speaker, or other device that requires both touch and radio frequency functions.

[0018] See Figure 2 and Figure 3 This application provides an earphone 10. The earphone 10 may include an antenna touch multiplexing device 100, a housing 11, a mechanism 12, and a support assembly 13. The support assembly 13 is used to support the housing 11 and the antenna touch multiplexing device 100 when worn in a wearing position. The aforementioned wearing position may be a specific location on the user's head, such as the mastoid process, temporal bone, parietal bone, frontal bone, etc., or the ear away from the front of the head, or the left and right sides of the head located in front of the user's ear on the sagittal axis of the human body. The housing 11 may house components such as the mechanism 12, which can convert electrical signals into mechanical vibrations. The mechanical vibrations may be transmitted mainly through a medium such as the user's skull (i.e., bone conduction) to form bone conduction sound, or mainly through a medium such as air (i.e., air conduction) to form air conduction sound. The support assembly 13 may be arranged in a ring shape and wrapped around the user's ear, for example Figure 3As shown in (a); it can also be configured with an ear hook and a back hook structure to wrap around the back of the head, for example... Figure 3 As shown in (b); it can also be configured as a headband structure and wrapped around the user's head, for example... Figure 3 As shown in (c). The antenna touch multiplexing device 100 enables the earphone 10 to have radio frequency communication capabilities, thereby enabling it to communicate with smart terminal devices such as mobile phones or tablets. The antenna touch multiplexing device 100 also enables the earphone 10 to have touch functionality, allowing users to control the earphone 10 via touch. Alternatively, signals generated by the user touching the earphone 10 can be transmitted to the aforementioned smart terminal device through the antenna touch multiplexing device 100. The antenna touch multiplexing device 100 is disposed within and close to the housing 11. The antenna touch multiplexing device 100 integrates the antenna 110 function and the touch function into one unit, disposed on the earphone 10 housing 11. The multiplexing of the antenna 110 and the touch sensing electrode enables the earphone 10 to have a compact structure, reducing space conflicts during electronic component layout.

[0019] See Figure 4 This application provides an antenna touch multiplexing device 100. The antenna touch multiplexing device 100 includes an antenna 110, a touch signal transmission path 120, a radio frequency (RF) signal transmission path 130, a touch chip 150, and an RF chip 160. The antenna 110 is connected to the touch chip 150 via the touch signal transmission path 120, and touch signals received by the antenna 110 can be transmitted to the touch chip 150 via the touch signal transmission path 120. The antenna 110 is connected to the RF chip 160 via the RF signal transmission path 130, and RF signals transmitted and received by the antenna 110 can be transmitted to the RF chip 160 via the RF signal transmission path 130. The touch chip 150 and the RF chip 160 are communicatively connected. The touch chip 150 can transmit specific touch trigger status information to the RF chip 160. Signals received by the RF chip 160 for controlling the parameters of the touch chip 150 can be transmitted to the touch chip 150.

[0020] Antenna 110 can be a two-dimensional antenna, which is composed of a sheet of metal with a certain area. For details, please refer to relevant technologies; further details will not be elaborated here. Antenna 110 can be used to conduct radio frequency signals. Antenna 110 can radiate the guided waves in the antenna touch multiplexing device 100 into space, converting them into free-space electromagnetic waves. Antenna 110 can also receive free-space electromagnetic waves in space and convert them into flowing guided waves in the antenna touch multiplexing device 100. By conducting radio frequency signals, antenna 110 enables the antenna touch multiplexing device 100 to communicate with the outside world via radio frequency. When antenna 110 comes into contact with a user's finger or other devices with an electric field, a coupling capacitor can be formed on its surface. Changes in the capacitance value of this coupling capacitor can generate touch signals. In summary, antenna 110 has both the ability to convert radio frequency signals and the ability to sense touch; antenna 110 is also a touch sensing electrode. This arrangement integrates the functions of antenna 110 and touch functionality, making the structure of the antenna touch multiplexing device 100 compact and reducing spatial conflicts in the layout of electronic components. In one embodiment, the antenna 110 has an antenna feed point 111, and the touch signal transmission path 120 and the radio frequency signal transmission path 130 are both electrically connected to the antenna feed point 111 to perform signal interaction with the antenna 110 through the antenna feed point 111.

[0021] Touch signal transmission path 120 is connected to antenna 110 and used to transmit touch signals. Touch signal transmission path 120 includes a first low-pass filter module 121 and a second low-pass filter module 122 connected in series between antenna 110 and touch chip 150. Low-frequency signals can pass normally through the first low-pass filter module 121 and the second low-pass filter module 122, while high-frequency signals exceeding a set threshold are blocked or attenuated. The first low-pass filter module 121 and the second low-pass filter module 122 can prevent radio frequency signals in radio frequency signal transmission path 130 from being transmitted to touch chip 150, thereby reducing the impact of radio frequency signals on touch performance.

[0022] Specifically, see Figure 5The first low-pass filter module 121 is an inductive circuit. The first low-pass filter module 121 can be a circuit composed of an inductor or a ferrite bead, or a circuit composed of inductors and capacitors, and the final circuit is inductive. The inductive circuit allows low-frequency signals to pass normally while blocking high-frequency signals. Optionally, the inductance value of the first low-pass filter module 121 is greater than or equal to 22nH. For example, an inductor or ferrite bead with an inductance value of 22nH is selected as the first low-pass filter module 121. The natural frequency of the inductive circuit with an inductance value of 22nH forms a stopband around 2.4GHz or around 1.4GHz, which is equivalent to an open circuit. Furthermore, while maintaining an open circuit at high frequencies, it is equivalent to a short circuit for touch signals below 500kHz, thus achieving low-pass, high-impedance filtering. In the touch multiplexing circuit of the antenna 110, the suitable frequency range for the touch signal is below 500kHz, and the suitable frequency range for the radio frequency signal is above 2.4GHz. The first low-pass filter module 121, which is greater than or equal to 22nH, can well meet the requirements of the antenna touch multiplexing device 100.

[0023] The second low-pass filter module 122 is an inductive circuit. The second low-pass filter module 122 can be a circuit composed of an inductor or a ferrite bead, or a circuit composed of inductors and capacitors, and the final circuit is inductive. The inductive circuit allows low-frequency signals to pass normally while blocking high-frequency signals. Optionally, the inductance value of the second low-pass filter module 122 is greater than or equal to 22nH. For example, an inductor or ferrite bead with an inductance value of 22nH is selected as the second low-pass filter module 122. The natural frequency of the inductive circuit with an inductance value of 22nH forms a stopband around 2.4GHz or around 1.4GHz, which is equivalent to an open circuit. Furthermore, while maintaining an open circuit at high frequencies, it is equivalent to a short circuit for touch signals below 500kHz, thus achieving low-pass, high-impedance filtering. In the touch multiplexing circuit of the antenna 110, the suitable frequency range for the touch signal is below 500kHz, and the suitable frequency range for the radio frequency signal is above 2.4GHz. The first low-pass filter module 121, which is greater than or equal to 22nH, can well meet the requirements of the touch signal transmission path 120 in the antenna touch multiplexing device 100 to cut off the radio frequency signal and allow the touch signal to pass.

[0024] Because radio frequency (RF) signals couple with the touch signal transmission path 120, interference signals are generated, degrading touch performance. To improve this technical problem, in this embodiment of the antenna touch multiplexing device 100, the trace distance between the first low-pass filter module 121 and the antenna 110 is less than the trace distance between the first low-pass filter module 121 and the second low-pass filter module 122. The trace distance between the second low-pass filter module 122 and the touch chip 150 is less than the trace distance between the first low-pass filter module 121 and the second low-pass filter module 122. In other words, the first low-pass filter module 121 is located close to the antenna 110, and the second low-pass filter module 122 is located close to the touch chip 150. With this configuration, the first low-pass filter module 121 can block the RF signal (guided wave) in the antenna touch multiplexing device 100, reducing its interference with the touch chip 150. The second low-pass filter module 122 can further block the RF signal (guided wave), further reducing the interference of the RF signal on the touch signal. Because the first low-pass filter module 121 is positioned close to the antenna 110 and the second low-pass filter module 122 is positioned close to the touch chip 150, the radio frequency signal (free-space electromagnetic wave) radiated by the antenna 110 is less likely to couple with the traces between the first low-pass filter module 121 and the antenna 110 and the traces between the second low-pass filter module 122 and the touch chip 150, thus ensuring the reliability of the touch performance. Furthermore, the signal generated after the traces between the first low-pass filter module 121 and the second low-pass filter module 122 couple with the radio frequency signal (free-space electromagnetic wave) radiated by the antenna 110 will be blocked from both ends of the traces by the first low-pass filter module 121 and the second low-pass filter module 122 respectively. The coupling between the traces between the first low-pass filter module 121 and the second low-pass filter module 122 and the radio frequency signal will not affect the touch chip 150 and the radio frequency chip 160. Therefore, the relative positions of the antenna 110 and the touch chip 150 can be flexibly arranged, optimizing the spatial layout of the antenna touch multiplexing device 100.

[0025] Optionally, the trace distance between the first low-pass filter module 121 and the antenna 110 is 0.2-90mm. For example, 0.3-70mm, 3-50mm, 5-30mm, or 0.2-0.3mm. If the trace between the first low-pass filter module 121 and the antenna 110 is too long, it will increase the probability of RF signal coupling with the trace, which will degrade touch performance. If the distance between the first low-pass filter module 121 and the antenna 110 is too short, it will result in an overly dense component distribution, reducing the flexibility of the layout.

[0026] Optionally, the trace distance between the second low-pass filter module 122 and the touch chip 150 is 0.2-90mm. For example, 0.3-70mm, 3-50mm, 5-30mm, or 0.2-0.3mm. If the trace between the second low-pass filter module 122 and the touch chip 150 is too long, it will increase the probability of RF signal coupling with the trace, which will degrade touch performance. If the distance between the second low-pass filter module 122 and the touch chip 150 is too short, it will result in an overly dense component distribution, reducing the flexibility of layout.

[0027] See Figure 4 The radio frequency (RF) signal transmission path 130 is connected to the antenna 110 and is used to transmit RF signals. The RF signal transmission path 130 includes a first high-pass filter module 131 connected in series between the antenna 110 and the RF chip 160. The first high-pass filter module 131 allows signals of frequencies higher than a certain value to pass through while blocking signals of lower frequencies. The first high-pass filter module 131 can block touch signals from the antenna 110 from passing through, thereby reducing the impact of touch signals on RF performance and improving the reliability of touch performance.

[0028] See Figure 5 Specifically, the first high-pass filter module 131 is a capacitive circuit. The first high-pass filter module 131 can be a circuit composed of capacitors and other electronic components, with the resulting capacitor exhibiting capacitive properties. Capacitive circuits allow high-frequency signals to pass through while blocking low-frequency signals. Optionally, the capacitance value of the first high-pass filter module 131 is less than or equal to 1μF. For example, a capacitor with a capacitance value of 1μF is selected as the first high-pass filter module 131. A capacitor with a capacitance value of 1μF is equivalent to an open circuit for signals below 500kHz and a short circuit for signals around 2.4GHz, thus achieving high-pass, low-impedance filtering. In the touch multiplexing circuit of the antenna 110, the suitable frequency range for the touch signal is below 500kHz, and the suitable frequency range for the radio frequency signal is above 2.4GHz. The first high-pass filter module 131 with a capacitance value less than or equal to 1μF can meet the requirement of blocking the touch signal in the radio frequency signal transmission path 130 of the antenna touch multiplexing device 100 while allowing the radio frequency signal to pass.

[0029] When antenna 110 is used as a touch electrode, it naturally possesses a certain amount of parasitic capacitance. The presence of this parasitic capacitance weakens the sensing capability of touch chip 150. Although touch chip 150 incorporates compensation circuitry to mitigate the effects of parasitic capacitance, the components in the RF signal transmission path 130 and the RF chip 160 further increase the parasitic capacitance, exceeding the compensation capability of touch chip 150. To improve this technical problem, see [reference needed]. Figure 4 and Figure 5The antenna touch multiplexing device 100 embodiment of this application also includes a third low-pass filter module 170. One end of the third low-pass filter module 170 is connected to the node between the first high-pass filter module 131 and the RF chip 160, and the other end of the third low-pass filter module 170 is grounded. For example Figure 5 The first high-pass filter module 131 includes a capacitor, and the third low-pass filter module 170 includes an inductor. The inductor is located on the side of the capacitor away from the antenna 110 and is grounded.

[0030] The third low-pass filter module 170 is an inductive circuit. The third low-pass filter module 170 can be a circuit composed of inductors or ferrite beads, or a circuit composed of inductors and capacitors, and the final circuit is inductive. Inductive circuits allow low-frequency signals to pass normally while blocking high-frequency signals. Similar to the first low-pass filter module 121 and the second low-pass filter module 122, the inductance value of the third low-pass filter module 170 is greater than or equal to 22nH. With this configuration, when the antenna touch multiplexing device 100 conducts low-frequency signals, the RF chip 160 will be short-circuited to ground relative to the touch signal transmission path 120, thus preventing the parasitic capacitance of components such as the RF chip 160 from affecting the touch chip 150, thereby optimizing touch performance. Therefore, the design of the RF chip 160 is not limited by touch performance, facilitating the design of the RF signal transmission path 130 and the RF chip 160. Due to its low-pass, high-impedance characteristics, the addition of the third low-pass filter module 170 has a relatively small impact on the transmission of radio frequency signals.

[0031] In one embodiment, due to space constraints, the antenna 110 is configured as an electrically small antenna. Because the electrically small antenna 110 has high capacitive reactance and low resistance, the radio frequency (RF) signal cannot be matched with it, resulting in a decrease in the reliability of RF signal transmission. To improve this technical problem, the antenna touch multiplexing device 100 further includes an antenna matching module 132. The antenna matching module 132 is disposed between the first high-pass filter module 131 and the RF chip 160. One end of the antenna matching module 132 is connected to the first high-pass filter module 131, and the other end is connected to the RF chip 160. The antenna matching module 132 can tune the RF signal to the electrically small antenna 110. The antenna matching module 132 can use an L-type matching circuit, a T-type matching circuit, or a PI-type matching circuit; no specific limitation is made here.

[0032] Furthermore, one end of the third low-pass filter module 170 is connected to the node between the first high-pass filter module 131 and the antenna matching module 132. With this configuration, when the antenna touch multiplexing device 100 transmits low-frequency signals, the RF chip 160 and the antenna matching module 132 are short-circuited to ground relative to the touch signal transmission circuit. This prevents the parasitic capacitance of the RF chip 160 and the antenna matching module 132 from affecting the touch chip 150, thus optimizing touch performance. In this way, the design of the RF chip 160 and the antenna 110 matching circuit is not limited by touch performance, facilitating the design of the antenna matching module 132 and the RF chip 160 in the RF signal transmission path 130. Due to its low-pass, high-impedance characteristics, the addition of the third low-pass filter module 170 has minimal impact on RF signal transmission.

[0033] In one embodiment, see Figure 6 and Figure 7 Antenna 110 has an antenna feed point 111 and an antenna base point 112. The radio frequency signal transmission path 130 is electrically connected to the antenna feed point 111. The touch signal transmission path 120 is electrically connected to the antenna base point 112. The antenna feed point 111 and the antenna base point 112 are spaced a certain distance apart. Therefore, the distance between the radio frequency signal transmission path 130 and the touch signal transmission path 120, as well as the distance between the radio frequency chip 160 and the touch chip 150, can be set to be relatively large, thereby reducing the requirements for circuit board integration and lowering design costs.

[0034] Furthermore, the antenna touch multiplexing device 100 also includes a ground path 140. The ground path 140 includes a second high-pass filter module 141. One end of the second high-pass filter module 141 is electrically connected to the antenna point 112. The other end of the second high-pass filter module 141 is grounded. When transmitting radio frequency signals, the ground path 140 is equivalent to a distributed parameter inductor, thereby achieving the effect of a distributed parameter capacitor for the tuning point small antenna 110.

[0035] Specifically, the second high-pass filter module 141 further forms an LC resonant circuit within the grounding path 140. For example, the second high-pass filter module 141 includes a capacitor and an inductor. Alternatively, the second high-pass filter module 141 is configured to cooperate with the traces within the grounding path 140 to form an LC resonant circuit.

[0036] Specifically, if the traces in the grounding path 140 can be equivalent to distributed parameter inductors, then the traces and the capacitive second high-pass filter module 141 are equivalent to an LC resonant circuit. Thus, the second high-pass filter module 141 is configured to cooperate with the traces in the grounding path 140 to form an LC resonant circuit.

[0037] Based on the above embodiment, the resonant frequency of the LC resonant circuit is lower than the operating frequency of the radio frequency signal. The LC resonant circuit thus configured is inductive. Since the grounding path 140 is inductive, the antenna 110 can be an IFA, PIFA, or LOOP antenna with grounding. Under the same clearance conditions, the antenna 110 described above has a wider bandwidth than an antenna 110 with only an antenna feed point 111.

[0038] The second high-pass filter module 141 is a capacitive circuit with a capacitance value greater than or equal to 22pF. The second high-pass filter module 141 is also a capacitive circuit with a capacitance value less than or equal to 1μF. Within the above range, the second high-pass filter module 141 is equivalent to an open circuit for signals below 500kHz, thus ensuring that the ground path 140 does not affect the transmission of touch signals. Within the above range, the second high-pass filter module 141 is equivalent to a short circuit for signals below 2.4GHz. Thus, the second high-pass filter module 141 can achieve high-pass, low-impedance filtering, enabling the ground path 140 to achieve the aforementioned technical effects when the antenna touch multiplexing device 100 is operating with radio frequency signals.

[0039] In summary, the touch chip 150 is connected to the antenna 110 via the touch signal transmission path 120. The radio frequency chip 160 is connected to the antenna 110 via the radio frequency transmission path. The antenna 110 can transmit radio frequency signals and also function as a touch electrode. This configuration integrates the antenna 110 function with the touch function, making the antenna touch multiplexing device 100 more compact and reducing the technical problem of layout space conflicts in electronic devices 1 such as headphones 10 using the antenna touch multiplexing device 100 of this application. In the embodiment of the antenna touch multiplexing device 100 of this application, the touch signal transmission path 120 includes a first low-pass filter module 121 and a second low-pass filter module connected in series. The trace distance between the first low-pass filter module 121 and the antenna 110 is less than the trace distance between the first low-pass filter module 121 and the second low-pass filter module 122. The trace distance between the second low-pass filter module 122 and the touch chip 150 is less than the trace distance between the first low-pass filter module 121 and the second low-pass filter module 122. In other words, the first low-pass filter module 121 is positioned close to the antenna 110, and the second low-pass filter module 122 is positioned close to the touch chip 150. This configuration allows the first low-pass filter module 121 to block the radio frequency (RF) signals in the antenna touch multiplexing device 100, reducing their interference with the touch chip 150. The second low-pass filter module 122 further blocks the RF signals, further reducing RF signal interference with the touch signals. Because the first low-pass filter module 121 is positioned close to the antenna 110, and the second low-pass filter module 122 is positioned close to the touch chip 150, the RF signals radiated and received by the antenna 110 are less likely to be coupled with interference signals generated by the wiring between the first low-pass filter module 121 and the antenna 110, and the wiring between the second low-pass filter module 122 and the touch chip 150, thus ensuring the reliability of the touch performance. Furthermore, the signal generated after the wiring between the first low-pass filter module 121 and the second low-pass filter module 122 is coupled with the radio frequency signal will be blocked from both ends by the first low-pass filter module 121 and the second low-pass filter module 122 respectively. The coupling between the wiring between the first low-pass filter module 121 and the second low-pass filter module 122 and the radio frequency signal will not affect the touch chip 150 and the radio frequency chip 160. Therefore, the relative position of the antenna 110 and the touch chip 150 can be flexibly arranged to optimize the spatial layout of the antenna touch multiplexing device 100.

[0040] Furthermore, in this application, unless otherwise expressly specified and limited, the terms "connected," "connected (electrically connected)," "stacked," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. An antenna touch multiplexing device, wherein, include: Antenna, the antenna being used to convert radio frequency signals and to sense touch; The touch signal transmission path is connected to the antenna and used to transmit touch signals; The radio frequency signal transmission path is connected to the antenna and used to transmit radio frequency signals; The touch chip is connected to the antenna via the touch signal transmission path; The radio frequency chip is connected to the antenna via the radio frequency signal transmission path, and the touch chip is communicatively connected to the radio frequency chip; The touch signal transmission path includes a first low-pass filter module and a second low-pass filter module connected in series between the antenna and the touch chip. The trace distance between the first low-pass filter module and the antenna is less than the trace distance between the first low-pass filter module and the second low-pass filter module. The trace distance between the second low-pass filter module and the touch chip is less than the trace distance between the first low-pass filter module and the second low-pass filter module. The first low-pass filter module is an inductive circuit. The antenna has an antenna feed point and an antenna ground point. The radio frequency signal transmission path is electrically connected to the antenna feed point, and the touch signal transmission path is electrically connected to the antenna ground point. The antenna touch multiplexing device also includes a grounding path, and the antenna ground point is grounded through the grounding path.

2. The antenna touch multiplexing device according to claim 1, wherein: The trace distance between the first low-pass filter module and the antenna is 0.2-90mm.

3. The antenna touch multiplexing device according to claim 1, wherein: The trace distance between the second low-pass filter module and the touch chip is 0.2-90mm.

4. The antenna touch multiplexing device according to claim 1, wherein: The radio frequency signal transmission path includes a first high-pass filter module connected in series between the antenna and the radio frequency chip.

5. The antenna touch multiplexing device according to claim 4, wherein: The first high-pass filter module is a capacitive circuit with a capacitance value less than or equal to 1μF.

6. The antenna touch multiplexing device according to claim 4, wherein: The antenna touch multiplexing device further includes a third low-pass filter module, one end of which is connected to the node between the first high-pass filter module and the radio frequency chip, and the other end of which is grounded.

7. The antenna touch multiplexing device according to claim 6, wherein: The first high-pass filter module includes a capacitor, and the third low-pass filter module includes an inductor, with the inductor located on the side of the capacitor away from the antenna.

8. The antenna touch multiplexing device according to claim 6, wherein: The antenna touch multiplexing device further includes an antenna matching module, which is disposed between the first high-pass filter module and the radio frequency chip. One end of the antenna matching module is connected to the first high-pass filter module, and the other end is connected to the radio frequency chip. One end of the third low-pass filter module is connected to the node between the first high-pass filter module and the antenna matching module.

9. The antenna touch multiplexing device according to claim 1, wherein: The antenna is an electrically small antenna.

10. The antenna touch multiplexing device according to claim 1, wherein: The first low-pass filter module is an inductive circuit with an inductance value greater than or equal to 22nH, and / or the second low-pass filter module is an inductive circuit with an inductance value greater than or equal to 22nH.

11. The antenna touch multiplexing device according to claim 1, wherein: The grounding path includes a second high-pass filter module, one end of which is electrically connected to the antenna ground, and the other end of which is grounded.

12. The antenna touch multiplexing device according to claim 11, wherein: The second high-pass filter module further forms an LC resonant circuit within the grounding path, and the resonant frequency of the LC resonant circuit is lower than the operating frequency of the radio frequency signal.

13. The antenna touch multiplexing device according to claim 11, wherein: The second high-pass filter module is a capacitive circuit with a capacitance value less than or equal to 1μF.

14. The antenna touch multiplexing device according to claim 12, wherein: The second high-pass filter module is configured to cooperate with the traces in the grounding path to form the LC resonant circuit.

15. The antenna touch multiplexing device according to claim 13, wherein: The capacitance value of the second high-pass filter module is greater than or equal to 22pF.

16. An earphone, wherein, include: The antenna touch multiplexing device as described in any one of claims 1-15; The housing, wherein the antenna touch multiplexing device is disposed within the housing and close to the housing; A support assembly for supporting the housing and the antenna touch multiplexing device when worn in the wearing position.

17. An electronic device, wherein, include: The antenna touch multiplexing device according to any one of claims 1-15.

Images