Antenna circuit for wireless electronic device and method of operating the same

Abstract

An antenna circuit for a wireless electronic device includes an antenna body, a wireless module, a touch patch, and a signal processing module. The wireless module is coupled to the antenna body, and the antenna body and the wireless module are used to achieve a first resonant mode. The signal processing module is coupled to the touch patch, and the signal processing module includes a first circuit unit and a second circuit unit. The first circuit unit is used to shield a touch signal and allow a high-frequency signal to pass to the ground terminal, and the second circuit unit is used to shield the high-frequency signal and detect the touch signal. The touch patch and the signal processing module are used to achieve a second resonant mode. The first resonant mode corresponds to a first frequency band, the second resonant mode corresponds to a second frequency band, and the first frequency band and the second frequency band are adjacent.

Description

Technical Field

[0001] The present invention relates to an antenna circuit and an operating method thereof, and more particularly to an antenna circuit of a wireless electronic device and an operating method thereof. Background Art

[0002] Wireless electronic devices are commonly used in daily life, allowing for easy portability and reducing the need for wires. Wireless electronic devices, such as Bluetooth headsets and Bluetooth wristbands, offer advantages such as compact size, stylish appearance, and portability, making them essential accessories for mobile communication devices. Furthermore, their applications are expanding, with multifunctional features such as touch control, detection, and audio playback, enhancing the user experience.

[0003] However, when a person approaches or touches a wireless electronic device, the antenna's resonant frequency shifts due to the body loading effect, affecting the antenna circuit's communication performance and user experience. Therefore, improving this problem of the antenna's resonant frequency shifting from the desired frequency band is a major area of ​​focus for the industry. Summary of the Invention

[0004] The present invention relates to an antenna circuit of a wireless electronic device and an operating method thereof, which are used to improve the communication performance of the antenna body.

[0005] According to one aspect of the present invention, an antenna circuit for a wireless electronic device is proposed, comprising an antenna body, a wireless module, a touch patch, and a signal processing module. The wireless module is coupled to the antenna body, and the antenna body and the wireless module are used to achieve a first resonant mode. The signal processing module is coupled to the touch patch, and the signal processing module includes a first circuit unit and a second circuit unit. The first circuit unit is used to shield a touch signal and allow a high-frequency signal to pass to the ground terminal, and the second circuit unit is used to shield the high-frequency signal and detect the touch signal. The touch patch and the signal processing module are used to achieve a second resonant mode. The first resonant mode corresponds to a first frequency band, the second resonant mode corresponds to a second frequency band, and the first frequency band and the second frequency band are adjacent.

[0006] According to one aspect of the present invention, a method for operating an antenna circuit of a wireless electronic device is proposed, comprising the following steps. An antenna circuit of a wireless electronic device is provided, the wireless electronic device comprising an antenna body, a wireless module, a touch patch, and a signal processing module. The wireless module is coupled to the antenna body, the signal processing module is coupled to the touch patch, and the signal processing module comprises a first circuit unit and a second circuit unit. A touch signal is shielded by the first circuit unit, and a high-frequency signal is allowed to pass through. The high-frequency signal is shielded by the second circuit unit, and the touch signal is detected. The antenna body and the wireless module are used to realize a first resonance mode, the touch patch and the signal processing module are used to realize a second resonance mode, the first resonance mode corresponds to a first frequency band, the second resonance mode corresponds to a second frequency band, and the first frequency band is adjacent to the second frequency band.

[0007] In order to better understand the above and other aspects of the present invention, the following embodiments are specifically described in detail with reference to the accompanying drawings: BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 A schematic diagram showing the appearance of a wireless electronic device according to an embodiment of the present invention;

[0009] Figure 2 A schematic diagram showing an antenna circuit of a wireless electronic device according to an embodiment of the present invention;

[0010] Figure 3A A diagram showing an example of the relative positions of the antenna body and the ground plane;

[0011] Figure 3B Shows the corresponding Figure 3A The relationship between the return loss of the antenna body and the frequency;

[0012] Figure 4A A diagram showing an example of the relative positions of the antenna body, the touch patch, and the ground plane;

[0013] Figure 4B Shows the corresponding Figure 4A The relationship between the return loss of the antenna body and the touch patch and the frequency;

[0014] Figure 5A A diagram showing an example of relative positions of an antenna body, a touch patch, and a ground plane using a circuit unit according to an embodiment of the present invention;

[0015] Figure 5B Shows the corresponding Figure 5A The relationship between the return loss of the antenna body and the touch patch and the frequency;

[0016] Figure 6 Show Figure 2An example of a detailed circuit diagram of an antenna circuit;

[0017] Figure 7A A schematic diagram illustrating the resonant frequency and return loss of an antenna circuit of a wireless electronic device according to an embodiment of the present invention;

[0018] Figure 7B A schematic diagram showing that the frequency bands of the dual resonance modes of the antenna circuit of a wireless electronic device according to an embodiment of the present invention are both not within a required frequency band;

[0019] Figure 7C A schematic diagram showing that the frequency of a first resonant mode of an antenna circuit of a wireless electronic device according to an embodiment of the present invention falls within a required frequency band; and

[0020] Figure 7D A schematic diagram showing that the frequency range of the second resonance mode of the antenna circuit of a wireless electronic device according to an embodiment of the present invention is within a required frequency range;

[0021] Figure 8 An exploded view of a wireless electronic device is shown;

[0022] Figure 9 An operating method of an antenna circuit of a wireless electronic device according to an embodiment of the present invention is shown.

[0023]

Explanation of symbols

[0024] 100: Wireless electronic devices

[0025] 102: Antenna circuit

[0026] 110: Antenna body

[0027] 111: Signal feed end

[0028] 120: Wireless module

[0029] 122: Circuit Board

[0030] 130: Touch patch

[0031] 131: Touch surface

[0032] 140:Signal processing module

[0033] 141: First circuit unit

[0034] 142: Second circuit unit

[0035] 310: Antenna body

[0036] 312: Ground plane

[0037] 314: Feed point

[0038] 330: Touch patch

[0039] BW0: Transmission band

[0040] F1, F2: frequency band

[0041] BW1: Bandwidth

[0042] S1: high frequency signal

[0043] S2: high frequency signal

[0044] T: touch signal

[0045] A: Path

[0046] B1: Filter path

[0047] B2: Filter path

[0048] 143: First filter

[0049] 144: Second filter

[0050] 145: Touch signal detection module

[0051] 1431: first capacitor component

[0052] 1432: First inductor component

[0053] 1441: Second inductor component

[0054] 1442: Second capacitor component

[0055] 150: Ground terminal DETAILED DESCRIPTION

[0056] The following will be combined with the accompanying drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. The following description uses the same / similar symbols to represent the same / similar components.

[0057] Please refer to Figure 1 and Figure 2 , Figure 1 FIG. 1 shows an example of a schematic diagram of the appearance of a wireless electronic device 100 according to an embodiment of the present invention. Figure 2 FIG. 1 is a block diagram of an antenna circuit 102 of a wireless electronic device 100 according to an embodiment of the present invention.

[0058] The antenna circuit 102 of the wireless electronic device 100 includes an antenna body 110, a wireless module 120, a touch patch 130, and a signal processing module 140. The wireless module 120 is coupled to the antenna body 110. The antenna body 110 and the wireless module 120 are used to achieve a first resonant mode. The signal processing module 140 is coupled to the touch patch 130. The signal processing module 140 includes a first circuit unit 141 and a second circuit unit 142. The first circuit unit 141 is used to shield a touch signal and allow a high-frequency signal to pass to the ground terminal. The second circuit unit 142 is used to shield high-frequency signals and detect touch signals. The touch patch 130 and the signal processing module 140 are used to achieve a second resonant mode. The first resonant mode corresponds to a first frequency band, and the second resonant mode corresponds to a second frequency band. The first frequency band is adjacent to the second frequency band.

[0059] The wireless electronic device 100 is, for example, an in-ear Bluetooth headset, an earhook wireless Bluetooth headset, or other types of Bluetooth wearable devices. This embodiment can also be applied to wireless (Bluetooth) mice, wireless (Bluetooth) styluses, and other wireless electronic devices that can be operated by human contact.

[0060] In one embodiment, the wireless electronic device 100 (eg, wireless earphones) receives wireless signals from a mobile communication device via the antenna body 110 and converts the wireless signals into audio signals via the wireless module 120 for playback by the wireless earphones.

[0061] Please refer to Figure 3A and Figure 3B , Figure 3A FIG. 1 is a diagram showing an example of the relative positions of the antenna body 310 and the ground plane 312. Figure 3B Shown as corresponding to Figure 3A The return loss of the antenna body 310 is plotted against frequency. Return loss is the incident power divided by the reflected power, expressed in dB. The antenna body 310 is located above and electrically connected to the ground plane 312. The antenna body 310 is connected to the wireless module 120 (see FIG. 1 ) via a feed point 314. Figure 2 ) is electrically connected. At this time, the relationship between the return loss of the antenna body 310 and the frequency is as follows Figure 3B As shown in Figure 3B, Figure 3A The transmission band BW0 obtained by the relationship between the antenna body 310 and the ground plane 312 shown has a single frequency band, that is, the antenna body 310 has a single resonance mode.

[0062] Please refer to Figure 4A and Figure 4B , Figure 4AFIG. 1 is a diagram showing an example of the relative positions of the antenna body 310, the touch patch 330 and the ground plane 312. Figure 4B Shown as corresponding to Figure 4A The antenna body 310 and the touch patch 330 are shown in FIG. 310. The antenna body 310 is located above the ground plane 312 and is electrically connected to the ground plane 312. The antenna body 310 is connected to the wireless module 120 (see FIG. 310 ) via the feed point 314. Figure 2 The touch patch 330 is electrically connected to the ground plane 312. The touch patch 330 is, for example, an extension of the ground plane 312. In other words, the touch patch 330 is, for example, a ground parasitic.

[0063] At this time, the relationship between the return loss of the antenna body 310 and the touch patch 330 and the frequency is as follows: Figure 4B As shown. Figure 4B It can be seen that Figure 4A The transmission frequency band obtained by the relationship between the antenna body 310, the ground plane 312 and the touch patch 330 shown has a dual frequency band, including frequency bands F1 and F2. That is, the antenna body 310 has a first resonance mode (corresponding to frequency band F1) and the touch patch 330 has a second resonance mode (corresponding to frequency band F2). Figure 4A The principle by which the antenna body 310 and the touch patch 330 can generate a dual resonance mode is described as follows.

[0064] Generally speaking, when an antenna radiates, part of the radiated signal is generated by the antenna body 310, while part of the radiated signal is generated by the ground plane 312. Therefore, by appropriately changing the structure of the ground plane 312, the radiation state of the antenna can be changed. After the touch patch 330 is electrically connected to the ground plane 312, the touch patch 330 can serve as an extension of the ground plane 312, thereby changing the structure of the ground plane 312. In other words, the equivalent ground plane covers both the ground plane 312 and the touch patch 330. In this way, a frequency band F2 adjacent to the original frequency band F0 is generated, allowing the antenna circuit 102 to have both frequency bands F1 and F2. This will widen the equivalent frequency band of the antenna circuit 102, that is, the bandwidth BW1 including the frequency bands F1 and F2 will be greater than the original bandwidth BW0. That is, the transmission frequency band of the antenna body 310 includes frequency bands F1 and F2, wherein the frequency band F1 corresponds to the first resonance mode, and the frequency band F2 corresponds to the second resonance mode.

[0065] Compared with the method of directly changing the structure of the antenna body 310 to make the antenna body 310 have a larger bandwidth, Figure 4AThe method shown is relatively easy to implement. Since it is difficult to achieve wide bandwidth wireless transmission with low frequency antennas (such as the frequency around 2.4GHz corresponding to the Bluetooth specification), the bandwidth of low frequency antennas can only reach about 0.1GHz or 0.2GHz, which cannot be designed to have a larger bandwidth like high frequency antennas (such as 5GHz). Figure 4A The method shown can more effectively achieve the effect of increasing the bandwidth of the antenna body 310.

[0066] Furthermore, if you want to obtain dual frequency bands by changing the structure of the antenna body 310, the dual frequency bands obtained may be dual frequency bands with a longer distance, and it is not easy to obtain two adjacent frequency bands. In addition to the difficulty of using one antenna to achieve the dual frequency band effect, the resulting antenna may also have the problem of increased volume. For wireless electronic devices that require a small volume (such as wireless headphones), it is difficult to have enough space to accommodate the increased volume of the antenna structure. Therefore, compared with changing the structure of the antenna body 310 to obtain dual frequency bands, Figure 4A The approach shown is relatively easy to implement an antenna with closely adjacent dual frequency bands without increasing the space required for the antenna structure.

[0067] The frequency value of the frequency band F2 is related to the position where the touch patch 330 is electrically connected to the ground plane 312, as well as the size of the touch patch 330. The frequency value of the frequency band F2 can be changed simply by adjusting the position where the touch patch 330 is electrically connected to the ground plane 312, or by adjusting the size of the touch patch 330.

[0068] Furthermore, since the touch patch 330 is an existing component in the wireless electronic device, the use of the touch patch 330 as an extension of the ground plane to change the radiation state of the antenna body 310 does not require additional metal sheets, does not require changes to the original structural design of the wireless electronic device 100, and does not require the cost of additional metal sheets, thereby saving design costs and material costs.

[0069] Figure 4A The touch patch 330 shown can be regarded as another independent antenna structure, which does not need to be coupled with the antenna body 310. The setting of the touch patch 330 can generate another frequency band F2. Figure 4A The electrical connection between the touch patch 330 and the ground plane 312 allows the touch patch 330 to function as an extension of the ground plane and generate antenna radiation. The touch patch 330 and the antenna body 310 can form an antenna with dual resonant modes and dual frequency bands, thereby having a wider bandwidth characteristic.

[0070] Please refer to Figure 5A and Figure 5B , Figure 5A FIG. 1 is a diagram showing an example of relative positions of an antenna body 310, a touch patch 330, and a ground plane 312 using a circuit unit according to an embodiment of the present invention. Figure 5B Shown is corresponding to Figure 5A Graph showing the relationship between return loss and frequency for the antenna body 310 and the touch patch 330. In order to enable the touch patch 330 to retain its original touch functionality, the embodiment of the present invention uses two circuit units to achieve dual resonance modes for the antenna circuit 102 and maintain the touch functionality of the touch patch 330.

[0071] like Figure 5A As shown, the first circuit unit 341 is used to shield a touch signal and allow a high-frequency signal to pass to the ground terminal. The second circuit unit 342 is used to shield the high-frequency signal and detect the touch signal. In this way, the high-frequency signal received by the touch patch 330 can be transmitted to the ground plane 312 through the first circuit unit 341 to achieve the following effect. Figure 4A and Figure 4B As shown, the antenna body 310 has the effect of a dual resonance mode. At the same time, when the user's finger touches the touch patch 330 and generates a touch signal, the touch signal can be transmitted to the second circuit unit 342, and the second circuit unit 342 can detect the touch signal to determine the instruction corresponding to the touch signal, while retaining the original function of the touch patch 330. For example, the user's finger touching the touch patch 330 can be, for example, tapping N times or pressing for M seconds, where N and M are positive integers. By setting different values ​​of N and M, the user's finger touching the touch patch 330 can be respectively corresponded to operation instructions for the wireless electronic device, such as answering or hanging up a call, pausing or continuing to play music, refusing to answer, or playing the previous song, or playing the next song, etc. Now let's Figure 5A A more specific implementation of the antenna circuit having the antenna body and the touch patch of this embodiment is illustrated below.

[0072] Please refer to Figure 1 and 2 The wireless electronic device 100 has a housing 101, and the antenna body 110 is disposed on the inner wall of the housing 101 (see Figure 8 ), and the wireless module 120 is disposed inside the housing 101. The antenna body 110 is coupled to the wireless module 120, and the antenna body 110 and the wireless module 120 are used to realize a first resonance mode. Figure 7A As shown, the first resonance mode corresponds to a first frequency band F1, and the first frequency band F1 is, for example, adjacent to a required frequency band N, and the required frequency band N is, for example, 2.4 GHz to 2.48 GHz. However, the present invention is not limited thereto.

[0073] Please refer to Figure 6 , Figure 6 Show Figure 2 The antenna body 110 has a signal feeding end 111, and the high-frequency signal S1 can be input to the wireless module 120 via the signal feeding end 111. The high-frequency signal S1 can be input to the wireless module 120 via the signal feeding end 111. Figure 2 and Figure 6 The path A shown is input to the wireless module 120. Through the path A between the wireless module 120 and the antenna body 110, the resonant frequency of the antenna circuit 102 can have a first frequency band F1 corresponding to the first resonant mode (see Figure 7A ).

[0074] In this embodiment, the antenna body 110 is used to form a planar inverted-F antenna (PIFA), for example, but the present invention is not limited thereto.

[0075] Furthermore, the touch patch 130 is, for example, a metal sheet or a capacitive touch patch. The touch patch 130 is, for example, circular or oval in shape, and the antenna body 110 is, for example, a long strip that partially surrounds the touch patch 130. In other words, the antenna body 110 and the touch patch 130 are adjacent to each other, but their functions can operate independently.

[0076] In this embodiment, the touch patch 130 is used to form a monopole antenna, for example, to receive the high-frequency signal S2 , and can also serve as a touch pad for the user to input the touch signal T.

[0077] 1 and 2 , the touch patch 130 is disposed on the inner wall of the housing 101 , for example, and the signal processing module 140 is disposed inside the housing 101 . The touch patch 130 and the signal processing module 140 are coupled to each other to achieve a second resonance mode.

[0078] Generally speaking, the touch patch 130 has a touch surface 131 for a finger to touch. When the finger touches the touch surface 131, a touch signal T is generated, and the touch signal T can be input to the signal processing module 140. Figure 2 and Figure 6 As shown, the touch signal T can reach the second circuit unit 142 via a filtering path B2.

[0079] In addition, another filtering path B1 can be formed between the touch patch 130 and the ground terminal 150 of the antenna circuit 102 (for example, implemented by the above-mentioned ground plane), so that the high-frequency signal S2 can reach the ground terminal 150 through the filtering path B1. In this way, the touch patch 130 can retain the touch function while the antenna circuit 102 also has the dual-mode radiation effect of a high-frequency antenna.

[0080] like Figure 7A As shown, in this embodiment, the second resonant mode corresponds to the second frequency band F2, and the first frequency band F1 is adjacent to the second frequency band F2. The second frequency band F2 is, for example, adjacent to a desired frequency band, such as 2.4 GHz to 2.48 GHz. Therefore, the antenna circuit 102 of this embodiment can generate a first resonant mode and a second resonant mode, thereby achieving a dual-mode antenna effect.

[0081] The antenna circuit 102 of this embodiment differs from conventional antenna circuits in that the antenna circuit 102 of this embodiment can compensate for the human body loading effect in different application scenarios through the multi-modal design of the antenna body 110 and the touch patch 130. When the frequency receivable by the antenna shifts due to the human body loading effect, the resonant frequency of the dual-mode antenna circuit 102 can be maintained within the required frequency band through the first frequency band F1 and the second frequency band F2 of the dual-resonance mode, thereby not affecting the communication performance of the antenna circuit 102 and the user experience.

[0082] Please refer to Figure 7A , a schematic diagram illustrating the resonant frequency and return loss of the antenna circuit 102 of the wireless electronic device 100 according to an embodiment of the present invention is shown. As described above, the antenna body 110 is used to form, for example, a planar inverted-F antenna, and the touch patch 130 is used to form, for example, a monopole antenna. Therefore, the relationship curve between the return loss and frequency formed by the antenna circuit 102 can be, for example, W-shaped or two adjacent V-shaped, wherein the first resonant mode corresponds to a first frequency band F1, and the second resonant mode corresponds to a second frequency band F2. The frequency of the second frequency band F2 can be higher than the frequency of the first frequency band F1. Generally speaking, the first frequency band F1 can be determined by the antenna body 110, and the second frequency band F2 can be determined by the grounding point position of the touch patch 130 and the size of the touch patch 130.

[0083] In one application scenario, the signal processing module 140 can shield the touch signal T via the first circuit unit 141 while allowing the high-frequency signal S2 to pass to the ground terminal 150 (as shown by the filter path B1). Simultaneously, the signal processing module 140 can also shield the high-frequency signal S2 via the second circuit unit 142 while detecting the touch signal T (as shown by the filter path B2). In this way, the touch signal T and the high-frequency signal S2 are separated by the signal processing module 140, allowing the touch patch 130 to maintain touch functionality while also enabling the antenna circuit 102 to achieve the dual-mode radiation effect of a high-frequency antenna.

[0084] In one embodiment, if Figure 6 As shown, the first circuit unit 141 includes, for example, a first filter 143 , and the second circuit unit 142 includes a second filter 144 and a touch signal detection module 145 .

[0085] like Figure 6 As shown, a first end C1 of the first filter 143 is coupled to the touch patch 130, and a second end C2 of the first filter 143 is grounded. A first end C3 of the second filter 144 is coupled to the touch patch 130, and a second end C4 of the second filter 144 is coupled to the touch signal detection module 145. In this embodiment, the first filter 143 is, for example, a high-pass filter, and the second filter 144 is, for example, a low-pass filter.

[0086] For example, the first filter 143 includes, but is not limited to, a first capacitor component 1431 and a first inductor component 1432. A first end a of the first capacitor component 1431 is coupled to the touch patch 130, and a second end b of the first capacitor component 1431 is grounded. The second end b of the first capacitor component 1431 is also coupled to a first end c of the first inductor component 1432, and a second end d of the first inductor component 1432 is grounded. As described above, the first filter 143 allows the high-frequency signal S2 to pass through to the ground terminal 150. However, since the impedance of the first capacitor component 1431 in the first filter 143 decreases as the frequency increases, the first capacitor component 1431 will shield the low-frequency (for example, below 10 Hz) touch signal T but will not shield the high-frequency signal S2.

[0087] In addition, the second filter 144 includes, for example, a second inductor component 1441 and a second capacitor component 1442. However, the present invention is not limited thereto. A first end e of the second inductor component 1441 is coupled to the touch patch 130, a second end f of the second inductor component 1441 is coupled to the touch signal detection module 145, and the second end f of the second inductor component 1441 is also coupled to a first end g of the second capacitor component 1442. A second end h of the second capacitor component 1442 is grounded. As described above, the second filter 144 allows the touch signal T to pass through, but the impedance of the second inductor component 1441 in the second filter 144 increases as the frequency increases, so that the second inductor component 1441 shields the high-frequency signal S2 but does not shield the touch signal T.

[0088] The following describes the effects of user actions on the antenna circuit 102 in different application scenarios.

[0089] Please refer to Figure 7B , which shows a schematic diagram showing that both dual resonance modes of the antenna circuit 102 of the wireless electronic device 100 according to an embodiment of the present invention are not within a required frequency band N. In one example, when the wireless electronic device 100 is not worn, or is away from the human body, or is not touched by a human finger after being worn, there is no human body loading effect. At this time, the frequencies of the dual resonance modes of the antenna circuit 102 of the wireless electronic device 100 are not within the required frequency band N. In other words, the frequency band F1 of the first resonance mode generated by the antenna body 110 and the wireless module 120 and the frequency band F2 of the second resonance mode generated by the touch patch 130 and the signal processing module 140 both deviate from the required frequency band N (for example, 2.4 GHz to 2.48 GHz). The frequency band F1 of the first resonance mode is, for example, between 2.5 GHz and 2.6 GHz, and the frequency band F2 of the second resonance mode is, for example, between 2.7 GHz and 2.8 GHz (for example, based on a return loss of -10 dB). The frequency band F1 of the first resonance mode is smaller than the frequency band F2 of the second resonance mode. The bandwidth BW of the antenna circuit 102 of the wireless electronic device 100 is, for example, 0.5 GHz (between 2.4 GHz and 2.9 GHz, for example, based on a return loss of -3 dB).

[0090] Next, please refer to Figure 7C, which shows a schematic diagram showing that the frequency of the first resonant mode of the antenna circuit 102 of the wireless electronic device 100 falls within a desired frequency band N according to an embodiment of the present invention. In one example, when the wireless electronic device 100 is worn in the ear (an in-ear event occurs) or contacts the human body, a body loading effect occurs, causing the frequency band of the wireless electronic device 100 to shift to the left. An in-ear event occurs, for example, when the user inserts the wireless electronic device 100 into the ear with their finger. The first frequency band F1 corresponding to the first resonant mode of the antenna circuit 102 of the wireless electronic device 100 may fall within the desired frequency band N. That is, the first frequency band F1 generated by the antenna body 110 and wireless module 120 and the second frequency band F2 generated by the touch patch 130 and signal processing module 140 are simultaneously shifted to the left due to the body loading effect, causing the first frequency band F1 to fall within the desired frequency band N (e.g., 2.4 GHz to 2.48 GHz), while the second frequency band F2 does not fall within the desired frequency band N (e.g., 2.4 GHz to 2.48 GHz). At this time, the first frequency band F1 is, for example, located between 2.4 GHz and 2.5 GHz, and the second frequency band F2 is, for example, located between 2.6 GHz and 2.7 GHz.

[0091] Next, please refer to Figure 7D , which shows a schematic diagram showing that the frequency band of the second resonant mode of the antenna circuit 102 of the wireless electronic device 100 according to an embodiment of the present invention falls within the desired frequency band N. In one example, when the wireless electronic device 100 is worn in the ear (an in-ear event occurs) and the touch patch 130 is being touched by a finger (a touch event occurs), a greater body loading effect is generated. At this time, the second frequency band F2 of the antenna circuit 102 of the wireless electronic device 100 may fall within the desired frequency band N. In other words, the first frequency band F1 generated by the antenna body 110 and the wireless module 120 and the second frequency band F2 generated by the touch patch 130 and the signal processing module 140 will be affected by the greater body loading effect and continue to shift to the left, causing the second frequency band F2 to fall within the desired frequency band N (e.g., 2.4 GHz to 2.48 GHz), but the first frequency band F1 will not fall within the desired frequency band N (e.g., 2.4 GHz to 2.48 GHz). At this time, the first frequency band F1 is, for example, located between 2.2 GHz and 2.3 GHz, and the second frequency band F2 is, for example, located between 2.4 GHz and 2.5 GHz.

[0092] As can be seen from the above description, when an object touches the touch patch 130, the touch signal detection module 145 detects a touch event by detecting the touch signal T. Furthermore, when an earbud touch event occurs, the first frequency band F1 shifts to a desired frequency band N. When both earbud touch and an earbud touch event occur, the second frequency band F2 shifts to the desired frequency band N. The frequency of the first frequency band F1 is higher than that of the desired frequency band N, and the frequency of the second frequency band F2 is higher than that of the first frequency band F1.

[0093] The above-mentioned embodiments of the present invention are now compared with several possible ways to solve the problem of antenna resonant frequency offset as follows. Several possible ways to solve the problem of antenna resonant frequency offset include: First, designing the antenna position to a position away from the touch area to reduce the influence of the user's fingers. However, the cost of this approach is that the size of the wireless electronic device is larger, affecting the appearance. Second, configure multiple groups of antennas and select antennas with better performance to use. However, the cost of this approach is that the antenna cost and the space required for configuring the antenna will be more than doubled, thereby increasing the cost and volume of the wireless electronic device. Third, a built-in inductive circuit is built into the wireless electronic device, combined with a variable load of inductance and capacitance to compensate for the frequency offset of the antenna. However, the cost of this approach is that the hardware cost will be additionally increased.

[0094] Because the above-described embodiments of the present invention do not require changing the position of the antenna body, configuring multiple antenna bodies, or integrating a sensing circuit into the wireless electronic device with a variable load of inductance and capacitance to compensate for antenna frequency shift, the above-described embodiments of the present invention utilize existing touch patches to achieve dual-mode, dual-band operation, thereby resolving the problem of antenna resonant frequency shift. Therefore, the above-described embodiments of the invention offer advantages such as saving hardware space and costs, while maintaining the compact size and aesthetics of the wireless electronic device.

[0095] Figure 8 An exploded view of a wireless electronic device (e.g., a wireless headset structure) is shown, wherein the antenna body 110 is electrically connected to the circuit on the circuit board 122, for example, by an antenna spring (the antenna spring presses the antenna body 110 and the circuit board 122 during assembly to achieve electrical connection) or conductive foam (there is metal powder or metal sheet on the outside of the foam).

[0096] In addition, please refer to Figure 9 , according to the above-mentioned embodiment of the present invention Figures 1 to 7D, a method for operating the antenna circuit 102 of a wireless electronic device 100 is provided, comprising the following steps. In step S910, an antenna circuit 102 of a wireless electronic device 100 is provided. The wireless electronic device 100 includes an antenna body 110, a wireless module 120, a touch patch 130, and a signal processing module 140. The wireless module 120 is coupled to the antenna body 110, and the signal processing module 140 is coupled to the touch patch 130. The signal processing module 140 includes a first circuit unit 141 and a second circuit unit 142. In step S920, a touch signal T is shielded by the first circuit unit 141, and a high-frequency signal S2 is allowed to pass through. In step S930, the high-frequency signal S2 is shielded by the second circuit unit 142, and the touch signal T is detected. Among them, the antenna body 110 and the wireless module 120 are used to realize a first resonance mode, and the touch patch 130 and the signal processing module 140 are used to realize a second resonance mode. The first resonance mode corresponds to a first frequency band F1, and the second resonance mode corresponds to a second frequency band F2. The first frequency band F1 is adjacent to the second frequency band F2.

[0097] According to the operating method of the above-mentioned embodiment of the present invention, the first circuit unit 141 includes a first filter 143, the second circuit unit 142 includes a second filter 144 and a touch signal detection module 145, a first end of the first filter 143 is coupled to the touch patch 130, a second end of the first filter 143 is grounded, a first end of the second filter 144 is coupled to the touch patch 130, and a second end of the second filter 144 is coupled to the touch signal detection module 145.

[0098] According to the operating method of the above embodiment of the present invention, the first filter 143 is a high-pass filter, and the second filter 144 is a low-pass filter.

[0099] According to the operating method of the above-mentioned embodiment of the present invention, the first filter 143 includes a first capacitor component 1431 and a first inductor component 1432, a first end of the first capacitor component 1431 is coupled to the touch patch 130, a second end of the first capacitor component 1431 is grounded, the second end of the first capacitor component 1431 is also coupled to a first end of the first inductor component 1432, and a second end of the first inductor component 1432 is grounded.

[0100] According to the operating method of the above-mentioned embodiment of the present invention, the second filter 144 includes a second inductor component 1441 and a second capacitor component 1442, a first end of the second inductor component 1441 is coupled to the touch patch 130, a second end of the second inductor component 1441 is coupled to the touch signal detection module 145, the second end of the second inductor component 1441 is also coupled to a first end of the second capacitor component 1442, and a second end of the second capacitor component 1442 is grounded.

[0101] According to the operating method of the above embodiment of the present invention, the touch patch 130 is a capacitive touch patch. When an object touches the touch patch 130 , the touch signal detection module 145 detects a touch event by detecting the touch signal T.

[0102] According to the operating method of the above embodiment of the present invention, the wireless electronic device 100 is a wireless headset. When an ear insertion event occurs in the wireless headset, the first frequency band F1 shifts to a desired frequency band N. When an ear insertion and touch event occurs in the wireless headset, the second frequency band F2 shifts to the desired frequency band N. The frequency of the first frequency band F1 is higher than the frequency of the desired frequency band N, and the frequency of the second frequency band F2 is higher than the frequency of the first frequency band F1.

[0103] According to the operating method of the above embodiment of the present invention, the antenna body 110 is used to form a planar inverted-F antenna, and the touch patch 130 is used to form a monopole antenna.

[0104] According to the operating method of the above embodiment of the present invention, the wireless electronic device 100 also has a shell 101, and the antenna body 110 and the touch patch 130 are used to be arranged on the inner wall surface of the shell 101. The antenna body 110 is long and partially surrounds the touch patch 130. The touch patch 130 includes a metal sheet.

[0105] According to the operating method of the above embodiment of the present invention, the wireless electronic device 100 is a Bluetooth headset or a Bluetooth wearable device, and the first frequency band F1 and the second frequency band F2 are close to 2.4 GHz.

[0106] According to the antenna circuit 102 of the wireless electronic device 100 and its operating method in the above-mentioned embodiment of the present invention, when an in-ear event or an in-ear and touch event occurs, the wireless electronic device 100 will cause the antenna circuit 102 to generate a human body loading effect, thereby changing the original antenna resonant frequency. However, the antenna circuit 102 of this embodiment has a dual resonant mode. Therefore, the first frequency band F1 or the second frequency band F2 can be shifted to a required frequency band N according to different application scenarios to compensate for the human body loading effect. Therefore, the reception performance of the antenna circuit 102 is not affected by frequency deviation, thereby improving the user experience.

[0107] In summary, although the present invention has been described above with reference to the embodiments, these are not intended to limit the present invention. Persons skilled in the art will readily appreciate that various modifications and variations can be made without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be determined by the scope of the present application.

Claims

1. An antenna circuit for a wireless electronic device, characterized in that: include: One antenna body; a wireless module coupled to the antenna body, wherein the antenna body and the wireless module are configured to realize a first resonance mode; One-touch patch; a signal processing module coupled to the touch patch, the signal processing module comprising a first circuit unit and a second circuit unit, the first circuit unit being configured to shield a touch signal and allow a high-frequency signal to pass to the ground, the second circuit unit being configured to shield the high-frequency signal and detect the touch signal, the touch patch and the signal processing module being configured to achieve a second resonant mode; Among them, the first resonance mode corresponds to a first frequency band, the second resonance mode corresponds to a second frequency band, and the first frequency band is adjacent to the second frequency band; the first resonance mode and the second resonance mode constitute a dual resonance mode of the antenna circuit, and the dual resonance mode characterizes: the first frequency band and / or the second frequency band are offset to the corresponding required frequency band based on different application scenarios.

2. The antenna circuit of the wireless electronic device according to claim 1, wherein: The first circuit unit includes a first filter, the second circuit unit includes a second filter and a touch signal detection module, a first end of the first filter is coupled to the touch patch, a second end of the first filter is grounded, a first end of the second filter is coupled to the touch patch, and a second end of the second filter is coupled to the touch signal detection module.

3. The antenna circuit of the wireless electronic device according to claim 2, wherein: The first filter is a high-pass filter, and the second filter is a low-pass filter.

4. The antenna circuit of the wireless electronic device according to claim 2, wherein: The first filter includes a first capacitor component and a first inductor component, a first end of the first capacitor component is coupled to the touch patch, a second end of the first capacitor component is grounded, the second end of the first capacitor component is also coupled to a first end of the first inductor component, and a second end of the first inductor component is grounded.

5. The antenna circuit of the wireless electronic device according to claim 2, wherein: The second filter includes a second inductor component and a second capacitor component. A first end of the second inductor component is coupled to the touch patch, a second end of the second inductor component is coupled to the touch signal detection module, the second end of the second inductor component is also coupled to a first end of the second capacitor component, and a second end of the second capacitor component is grounded.

6. The antenna circuit of the wireless electronic device according to claim 2, wherein: The touch patch is a capacitive touch patch. When an object touches the touch patch, the touch signal detection module detects the touch signal and thus detects that a touch event has occurred.

7. The antenna circuit of the wireless electronic device according to claim 1, wherein: The wireless electronic device is a wireless headset. When an ear insertion event occurs, the first frequency band shifts to a desired frequency band. When an ear insertion and touch event occurs, the second frequency band shifts to the desired frequency band. The frequency of the first frequency band is higher than the frequency of the desired frequency band, and the frequency of the second frequency band is higher than the frequency of the first frequency band.

8. The antenna circuit of a wireless electronic device according to claim 1, wherein: The antenna body is used to form a planar inverted-F antenna, and the touch patch is used to form a monopole antenna.

9. The antenna circuit of a wireless electronic device according to claim 1, wherein: The wireless electronic device also has a shell. The antenna body and the touch patch are arranged on the inner wall of the shell. The antenna body is in a long strip shape and partially surrounds the touch patch. The touch patch includes a metal sheet.

10. A method for operating an antenna circuit of a wireless electronic device, characterized in that: include: The antenna circuit as claimed in claim 1 is applied to shift the first frequency band or the second frequency band to a required frequency band in response to a human body loading effect generated when the antenna contacts a human body.

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