Communication device and communication method

Abstract

A communication device comprises a radio frequency module, an integration module, a first tuning circuit, a signal transmission line and a first antenna element. The radio frequency module can generate a radio frequency signal. The integration module comprises a specific absorption rate sensor and a human body communication module. The signal transmission line includes a central conductor and an outer conductor. The radio frequency signal can be transmitted to the first antenna element through the signal transmission line. A first end of the human body communication module is coupled to the central conductor through the first tuning circuit, and a second end of the human body communication module is coupled to the external conductor.

Description

Technical Field

[0001] The present invention relates to a communication device, and more particularly to a communication device and a communication method. Background Art

[0002] In the field of mobile communication, due to the extremely limited internal space of related devices, it is difficult to accommodate too many circuit elements at the same time. Moreover, since these circuit elements are very close to each other, serious mutual interference often occurs between them, resulting in a decline in the overall operating performance. In view of this, it is necessary to propose a new solution to overcome the problems faced by the prior art. Summary of the Invention

[0003] In a preferred embodiment, the present invention provides a communication device, comprising: a radio frequency module for generating a radio frequency signal; an integration module including a specific absorption rate sensor and a human body communication module; a first tuning circuit; a signal transmission line including a central conductor and an outer conductor; and a first antenna element, wherein the radio frequency signal is transmitted to the first antenna element via the signal transmission line; wherein the human body communication module has a first end and a second end, the first end of the human body communication module is coupled to the central conductor via the first tuning circuit, and the second end of the human body communication module is coupled to the outer conductor.

[0004] In some embodiments, the specific absorption rate sensor has a first end and a second end, the first end of the specific absorption rate sensor is coupled to the central conductor, and the second end of the specific absorption rate sensor is coupled to the outer conductor.

[0005] In some embodiments, the human body communication module covers a first operating frequency band, the first antenna element covers a second operating frequency band, and the second operating frequency band is different from the first operating frequency band.

[0006] In some embodiments, the first operating frequency band is between 1 MHz and 100 MHz, and the second operating frequency band is higher than or equal to 700 MHz.

[0007] In some embodiments, the specific absorption rate sensor covers a third operating frequency band, and the third operating frequency band is between 0.7 GHz and 7 GHz.

[0008] In some embodiments, the second end of the human body communication module is implemented by a metal element.

[0009] In some embodiments, the metal element is a flexible circuit board.

[0010] In some embodiments, the communication device further includes: a non-conductive back cover, wherein the flexible circuit board is disposed on the inner side of the non-conductive back cover.

[0011] In some embodiments, the metal component is a second antenna component.

[0012] In some embodiments, the first tuning circuit includes: a first band-pass filter, wherein a pass band of the first band-pass filter is equivalent to the first operating band.

[0013] In some embodiments, the first tuning circuit further includes: a first switch, selectively conducting or disconnecting, wherein the first switch is serially coupled to the first band-pass filter.

[0014] In some embodiments, the communication device further includes: a second tuning circuit, wherein the second end of the human body communication module is further coupled to the external conductor via the second tuning circuit.

[0015] In some embodiments, the second tuning circuit includes: a second band-pass filter, wherein a pass band of the second band-pass filter is equivalent to the first operating band.

[0016] In some embodiments, the second tuning circuit further includes: a second switch, selectively conducting or disconnecting, wherein the second switch is serially coupled to the second band-pass filter.

[0017] In some embodiments, the communication device further includes: a camera metal frame, including a first part and a second part, wherein a separation gap is formed between the first part and the second part.

[0018] In some embodiments, the first end of the human body communication module is implemented through the first part of the camera metal frame.

[0019] In some embodiments, the second end of the human body communication module is implemented through the second part of the camera metal frame.

[0020] In some embodiments, the communication device further includes: an inertial measurement unit, determining whether the communication device is operating in a handheld mode or a pocket mode.

[0021] In some embodiments, the communication device further includes: an adjustable matching circuit, coupled between the inertial measurement unit and the human body communication module, wherein if the communication device is operating in the handheld mode, the adjustable matching circuit will provide a first impedance value to the human body communication module, and if the communication device is operating in the pocket mode, the adjustable matching circuit will provide a second impedance value to the human body communication module.

[0022] In another preferred embodiment, the present invention provides a communication method, comprising the following steps: providing a radio frequency module, an integration module, a first tuning circuit, a signal transmission line, and a first antenna element, wherein the integration module includes a specific absorption rate sensor and a human body communication module, and the signal transmission line includes a center conductor and an outer conductor; generating a radio frequency signal through the radio frequency module; transmitting the radio frequency signal to the first antenna element through the signal transmission line; and coupling a first end of the human body communication module to the center conductor via the first tuning circuit, and coupling a second end of the human body communication module to the outer conductor. Description of the Drawings

[0023] Figure 1 Schematic diagram showing a communication device according to an embodiment of the present invention.

[0024] Figure 2 Schematic diagram showing a first tuning circuit according to an embodiment of the present invention.

[0025] Figure 3 Schematic diagram showing a communication device according to an embodiment of the present invention.

[0026] Figure 4 Schematic diagram showing a communication device according to an embodiment of the present invention.

[0027] Figure 5 Schematic diagram showing a communication device according to an embodiment of the present invention.

[0028] Figure 6 Schematic diagram showing a second tuning circuit according to an embodiment of the present invention.

[0029] Figure 7 Flowchart showing a communication method according to an embodiment of the present invention.

[0030] Symbol Description:

[0031] 100, 300, 400, 500: Communication device

[0032] 110: Radio frequency module

[0033] 120, 520: Integration module

[0034] 130: Specific absorption rate sensor

[0035] 131: First end of the specific absorption rate sensor

[0036] 132: Second end of the specific absorption rate sensor

[0037] 140, 540: Human body communication module

[0038] 141,541: The first end of the human body communication module

[0039] 142,542: The second end of the human body communication module

[0040] 150: The first tuning circuit

[0041] 152: The first band - pass filter

[0042] 154: The first switch

[0043] 160: The signal transmission line

[0044] 164: The center conductor

[0045] 165: The outer conductor

[0046] 171: The first antenna element

[0047] 172: The second antenna element

[0048] 180: The metal element

[0049] 382: The flexible circuit board

[0050] 384: The non - conductive back cover

[0051] 490: The camera metal frame

[0052] 494: The first part of the camera metal frame

[0053] 495: The second part of the camera metal frame

[0054] 496: The separation gap

[0055] 497 - 1,497 - 2,497 - N: The openings

[0056] 580: The second tuning circuit

[0057] 582: The second band - pass filter

[0058] 584: The second switch

[0059] 592: The inertial measurement unit

[0060] 594: The adjustable matching circuit

[0061] MD1: Handheld mode

[0062] MD2: Oral loan mode

[0063] S710,S720,S730,S740: Steps

[0064] SF: Radio frequency signal

[0065] Z1: First impedance value

[0066] Z2: Second impedance value Detailed implementation manners

[0067] To make the objectives, features, and advantages of the present invention more obvious and understandable, specific embodiments of the present invention are hereinafter given, and detailed descriptions are made in conjunction with the accompanying drawings as follows.

[0068] In the description and claims, certain terms are used to refer to specific elements. Those skilled in the art should understand that hardware manufacturers may use different terms to refer to the same element. The description and claims of this specification do not use the difference in names as a way to distinguish elements, but use the difference in functions of elements as the criterion for distinction. The terms "comprising" and "including" mentioned throughout the description and claims are open-ended terms, and should be interpreted as "including but not limited to". The term "substantially" means within an acceptable error range, and those skilled in the art can solve the technical problems within a certain error range and achieve the basic technical effects. In addition, the term "coupled" in this specification includes any direct and indirect electrical connection means. Therefore, if it is described in the text that a first device is coupled to a second device, it means that the first device can be directly electrically connected to the second device, or indirectly electrically connected to the second device through other devices or connection means.

[0069] The following disclosure provides many different embodiments or examples for implementing different features of the present case. The following disclosure describes specific examples of the arrangement of each component to simplify the description. Of course, these specific examples are not used for limitation. For example, if this specification describes that a first feature is formed on or above a second feature, it means that it may include an embodiment in which the above-mentioned first feature and the above-mentioned second feature are in direct contact, and may also include an embodiment in which additional features are formed between the above-mentioned first feature and the above-mentioned second feature, so that the above-mentioned first feature and the second feature may not be in direct contact. In addition, the same reference symbols or (and) marks may be reused in different examples in the following description. These repetitions are for the purpose of simplification and clarity, and are not used to limit a specific relationship between the different embodiments or (and) structures discussed.

[0070] In addition, there are terms related to space. For example, "below", "beneath", "lower", "above", "higher" and similar terms are used to facilitate the description of the relationship between an element or feature and another (or some) element or feature in the drawings. Except for the orientations shown in the drawings, these space-related terms are intended to include different orientations of the device in use or operation. The device may be turned to different orientations (rotated 90 degrees or other orientations), and the space-related terms used here can also be interpreted in the same way.

[0071] Figure 1 A schematic diagram of a communication device 100 according to an embodiment of the present invention is shown. The communication device 100 can be applied to a mobile device, such as a smart phone, a tablet computer, or a notebook computer, but is not limited thereto. In Figure 1 the embodiment, the communication device 100 includes a radio frequency (RF) module 110, an integrated module 120, a first tuning circuit 150, a signal transmission line 160, and a first antenna element 171. It must be understood that although not shown in Figure 1 it, the communication device 100 may further include other elements, such as a housing, a speaker, and / or a power supply module.

[0072] For example, the RF module 110 can be a transceiver. The RF module 110 can be used to generate a radio frequency signal SF. The signal transmission line 160 includes a central conductor 164 and an external conductor 165. The radio frequency signal SF can be transmitted to the first antenna element 171 via the signal transmission line 160. However, the present invention is not limited thereto. In other embodiments, the first antenna element 171 can also be used to receive another radio frequency signal, which can be further transmitted to the RF module 110 via the signal transmission line 160.

[0073] The integrated module 120 includes a specific absorption rate (SAR) sensor 130 and a human body communication (HBC) module 140. For example, the SAR sensor 130 and the HBC module 140 can be integrated with each other, so that the two can be implemented on a single integrated circuit (IC), but is not limited thereto.

[0074] For example, a radio frequency power of the radio frequency module 110 can be adjusted according to a detection result of the specific absorption rate sensor 130. Specifically, the specific absorption rate sensor 130 has a first end 131 and a second end 132, wherein the first end 131 of the specific absorption rate sensor 130 is coupled to the center conductor 164 of the signal transmission line 160, and the second end 132 of the specific absorption rate sensor 130 is coupled to the outer conductor 165 of the signal transmission line 160.

[0075] The human body communication module 140 can receive or transmit relevant signals via an adjacent human body. Specifically, the human body communication module 140 has a first end 141 and a second end 142, wherein the first end 141 of the human body communication module 140 is coupled to the center conductor 164 of the signal transmission line 160 via the first tuning circuit 150, and the second end 142 of the human body communication module 140 is coupled to the outer conductor 165 of the signal transmission line 160. For example, in the human body communication module 140, one of its first end 141 and second end 142 can be used as a transmitter pad (TX Pad), and the other of its first end 141 and second end 142 can be used as a receiver pad (RX Pad), but it is not limited thereto. It should be noted that the terms "proximity" or "adjacent" in this specification can mean that the distance between the corresponding two elements is less than a predetermined distance (e.g., 10 mm or shorter), and can also include the case where the corresponding two elements are in direct contact with each other (i.e., the aforementioned distance is reduced to 0).

[0076] In some embodiments, the second end 142 of the human body communication module 140 can be implemented by a metal element 180, and this metal element 180 can also be coupled to the outer conductor 165 of the signal transmission line 160. The metal element 180 can have different types and functions, which will be introduced in subsequent embodiments.

[0077] The type of the first antenna element 171 is not particularly limited in the present invention. For example, the first antenna element 171 can be a monopole antenna, a dipole antenna, a loop antenna, a planar inverted F antenna (PIFA), or a chip antenna.

[0078] In some embodiments, the human body communication module 140 may cover a first operational frequency band, while the first antenna element 171 may cover a second operational frequency band, where the second operational frequency band is different from the first operational frequency band. For example, the first operational frequency band may be between 1 MHz and 100 MHz, and the second operational frequency band may be higher than or equal to 700 MHz, but is not limited thereto. Additionally, the specific absorption rate sensor 130 may cover a third operational frequency band, which may be between 0.7 GHz and 7 GHz. Therefore, the mutual interference between the human body communication module 140 and each of the specific absorption rate sensor 130 and the first antenna element 171 will be relatively low.

[0079] Figure 2 Shows a schematic diagram of the first tuning circuit 150 according to an embodiment of the present invention. In Figure 2 this embodiment, the first tuning circuit 150 includes a first band - pass filter 152 and a first switch element 154. For example, a passing frequency band of the first band - pass filter 152 may be equivalent to the aforementioned first operational frequency band. Additionally, the first switch element 154 can be selectively closed or opened, where the first switch element 154 is serially coupled with the first band - pass filter 152. The first band - pass filter 152 can be used to remove noise outside the aforementioned first operational frequency band. If the noise is too severe, the first switch element 154 can also be completely opened according to a control signal to avoid negative impacts on the human body communication module 140. However, the present invention is not limited thereto. In some other embodiments, the first tuning circuit 150 may also only include the first band - pass filter 152 or the first switch element 154.

[0080] Under the design of the present invention, the communication device 100 can well integrate the specific absorption rate sensor 130 and the human body communication module 140, and can effectively suppress the mutual interference between the two. Therefore, the proposed communication device 100 can support the dual functions of specific absorption rate sensing and human body communication without additionally increasing the overall device size.

[0081] The following embodiments will introduce various different configurations and detailed structural features of the communication device 100. It must be understood that these drawings and descriptions are for illustration only and are not used to limit the present invention.

[0082] Figure 3 Shows a schematic diagram of the communication device 300 according to an embodiment of the present invention. Figure 3 and Figure 1 similar. In Figure 3In the embodiment, the communication device 300 further includes a flexible printed circuit (FPC) 382 and a non-conductive back cover 384. The flexible printed circuit 382 can be disposed on the inner side of the non-conductive back cover 384, and the user's hand can contact the outer side of the non-conductive back cover 384. For example, the aforementioned metal component 180 (i.e., the second end 142 of the human body communication module 140) can be the flexible printed circuit 382. When the communication device 300 is held by the user's hand, a capacitive coupling effect can be induced between the flexible printed circuit 382 and the user's hand, such that the flexible printed circuit 382 can be used to receive a human body communication signal from the user. Figure 3 The remaining features of the communication device 300 are the same as Figure 1 those of the communication device 100. Therefore, similar operational effects can be achieved in both embodiments.

[0083] Please refer to Figure 1 again. In some other embodiments, the aforementioned metal component 180 can be a second antenna component 172, and there can be a relatively high isolation between the second antenna component 172 and the first antenna component 171. Additionally, the type of the second antenna component 172 is not particularly limited in the present invention. It must be understood that the second antenna component 172 is only an optional element and can also be removed in other embodiments.

[0084] Figure 4 FIG. shows a schematic diagram of a communication device 400 according to an embodiment of the present invention. Figure 4 and Figure 1 are similar. In Figure 4In an embodiment, the communication device 400 further includes a camera metal frame 490, which can be disposed corresponding to a plurality of camera lenses (not shown). Specifically, the camera metal frame 490 includes a first portion 494 and a second portion 495, and a partition gap 496 can be formed between the first portion 494 and the second portion 495 of the camera metal frame 490. For example, a nonconductive material (not shown) can be further filled in the partition gap 496 so that the first portion 494 and the second portion 495 of the camera metal frame 490 do not directly contact each other. In some embodiments, the first end 141 of the human body communication module 140 can be implemented through the first portion 494 of the camera metal frame 490, and the second end 142 of the human body communication module 140 can be implemented through the second portion 495 of the camera metal frame 490, but it is not limited thereto. When the communication device 400 is held by the user's hand, another capacitance coupling effect can be caused between the camera metal frame 490 and the user's hand, so that the camera metal frame 490 can be used to receive or transmit another human body communication signal about the user. In addition, the camera metal frame 490 can further have a plurality of openings 497-1, 497-2, …, 497-N (where "N" can be any integer greater than or equal to 2) to respectively accommodate the foregoing camera lenses. For example, each opening can be a rectangle, a square, or a circle, but it is not limited thereto. Figure 4 The remaining features of the communication device 400 are the same as Figure 1 those of the communication device 100, so these two embodiments can achieve similar operating effects.

[0085] Figure 5 FIG. shows a schematic diagram of a communication device 500 according to an embodiment of the present invention. Figure 5 and Figure 1 similar. In Figure 5In an embodiment, the communication device 500 further includes a second tuning circuit 580, an inertial measurement unit (IMU) 592, and a tunable matching circuit 594. Additionally, a human body communication module 540 of an integration module 520 of the communication device 500 has a first end 541 and a second end 542, wherein the first end 541 of the human body communication module 540 is coupled to the center conductor 164 of the signal transmission line 160 via the first tuning circuit 150, and the second end 542 of the human body communication module 540 is coupled to the outer conductor 165 of the signal transmission line 160 via the second tuning circuit 580. The inertial measurement unit 592 can detect a movement state of the communication device 500, so as to determine whether the communication device 500 is operating in a holding mode MD1 or a pocket mode MD2. The tunable matching circuit 594 is coupled between the inertial measurement unit 592 and the human body communication module 540 and can be controlled by the inertial measurement unit 592. For example, if the communication device 500 is operating in the holding mode MD1, the tunable matching circuit 594 will provide a first impedance value Z1 to the human body communication module 540; conversely, if the communication device 500 is operating in the pocket mode MD2, the tunable matching circuit 594 will provide a second impedance value Z2 to the human body communication module 540, where this second impedance value Z2 can be different from the aforementioned first impedance value Z1. In other words, the tunable matching circuit 594 can perform a calibration and compensation process for the human body communication module 540 in different operating modes, thereby optimizing the communication quality of the human body communication module 540. Figure 5 The remaining features of the communication device 500 are the same as those of Figure 1 the communication device 100, so these two embodiments can achieve similar operating effects.

[0086] Figure 6 Shows a schematic diagram of the second tuning circuit 580 according to an embodiment of the present invention. In Figure 6In an embodiment, the second tuning circuit 580 includes a second band-pass filter 582 and a second switch 584. For example, a passband of the second band-pass filter 582 may be equivalent to the aforementioned first operating band. Additionally, the second switch 584 can be selectively turned on or off, and the second switch 584 may be serially coupled to the second band-pass filter 582. The second band-pass filter 582 can be used to remove noise outside the aforementioned first operating band. If the noise is too severe, the second switch 584 can also be completely turned off according to another control signal to avoid negative impacts on the body communication module 540. However, the present invention is not limited thereto. In some other embodiments, the second tuning circuit 580 may also include only the second band-pass filter 582 or the second switch 584.

[0087] Figure 7 FIG. shows a flowchart of a communication method according to an embodiment of the present invention. In step S710, a radio frequency module, an integration module, a first tuning circuit, a signal transmission line, and a first antenna element are provided, where the integration module includes a specific absorption rate sensor and a body communication module, and the signal transmission line includes a center conductor and an outer conductor. In step S720, a radio frequency signal is generated by the radio frequency module. In step S730, the radio frequency signal is transmitted to the first antenna element through the signal transmission line. In step S740, a first end of the body communication module is coupled to the center conductor via the first tuning circuit, and a second end of the body communication module is coupled to the outer conductor. It must be understood that the above steps do not need to be executed in sequence, and Figures 1-6 each feature of the embodiment of Figure 7 can be applied to the

[0088] The present invention proposes a novel communication device and a communication method. Compared with traditional designs, the present invention has at least the advantages of being able to integrate a specific absorption rate sensor and a body communication module, being able to reduce the overall device size, and being able to reduce the overall manufacturing cost. Therefore, it is very suitable for application in various devices.

[0089] It should be noted that the above-mentioned component parameters are not limiting conditions of the present invention. Designers can adjust these setting values according to different needs. The communication device and communication method of the present invention are not limited to Figures 1-7 the state shown. The present invention may only include Figures 1-7 any one or more features of any one or more embodiments of

[0090] The method of the present invention, or a specific form or a part thereof, may exist in the form of program code. The program code may be included in a tangible medium, such as a floppy disk, an optical disk, a hard disk, or any other machine-readable (such as computer-readable) storage medium, or may not be limited to a computer program product in an external form. Wherein, when the program code is loaded and executed by a machine, such as a computer, this machine becomes a device for participating in the present invention. The program code may also be transmitted through some transmission media, such as wires or cables, optical fibers, or any transmission form. Wherein, when the program code is received, loaded, and executed by a machine, such as a computer, this machine becomes a device for participating in the present invention. When actually operating on a general-purpose processing unit, the program code combined with the processing unit provides a unique device that operates similarly to application-specific logic circuits.

[0091] In the present specification and claims, ordinal numbers, such as "first", "second", "third", etc., do not have a sequential relationship with each other. They are only used to label and distinguish two different elements with the same name.

[0092] Although the present invention is disclosed above with preferred embodiments, it is not intended to limit the scope of the present invention. Any person skilled in the art can make some modifications and refinements without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be subject to that defined by the appended claims.

Claims

1. A communication device, comprising: a radio frequency module that generates a radio frequency signal; an integration module that includes a specific absorption rate sensor and a human body communication module; a first tuning circuit; a signal transmission line that includes a center conductor and an outer conductor; and a first antenna element, wherein the radio frequency signal is transmitted to the first antenna element via the signal transmission line; wherein the human body communication module has a first end and a second end, the first end of the human body communication module is coupled to the center conductor via the first tuning circuit, and the second end of the human body communication module is coupled to the outer conductor.

2. The communication device according to claim 1, wherein the specific absorption rate sensor has a first end and a second end, the first end of the specific absorption rate sensor is coupled to the center conductor, and the second end of the specific absorption rate sensor is coupled to the outer conductor.

3. The communication device according to claim 1, wherein the human body communication module covers a first operating frequency band, the first antenna element covers a second operating frequency band, and the second operating frequency band is different from the first operating frequency band.

4. The communication device according to claim 3, wherein the first operating frequency band is between 1 MHz and 100 MHz, and the second operating frequency band is higher than or equal to 700 MHz.

5. The communication device according to claim 3, wherein the specific absorption rate sensor covers a third operating frequency band, and the third operating frequency band is between 0.7 GHz and 7 GHz.

6. The communication device according to claim 1, wherein the second end of the human body communication module is implemented by a metal element.

7. The communication device according to claim 6, wherein the metal element is a flexible circuit board.

8. The communication device according to claim 7, further comprising: a non-conductive back cover, wherein the flexible circuit board is disposed on the inner side of the non-conductive back cover.

9. The communication device according to claim 6, wherein the metal element is a second antenna element.

10. The communication device according to claim 3, wherein the first tuning circuit includes: a first band-pass filter, wherein a pass band of the first band-pass filter is equivalent to the first operating frequency band.

11. The communication device according to claim 10, wherein the first tuning circuit further includes: a first switch that selectively conducts or disconnects, wherein the first switch is serially coupled with the first band-pass filter.

12. The communication device according to claim 3, further comprising: a second tuning circuit, wherein the second end of the human body communication module is further coupled to the outer conductor via the second tuning circuit.

13. The communication device according to claim 12, wherein the second tuning circuit includes: a second band-pass filter, wherein a pass band of the second band-pass filter is equivalent to the first operating frequency band.

14. The communication device according to claim 13, wherein the second tuning circuit further includes: a second switch that selectively conducts or disconnects, wherein the second switch is serially coupled with the second band-pass filter.

15. The communication device according to claim 1, further comprising: A camera metal frame includes a first part and a second part, and a separation gap is formed between the first part and the second part.

16. The communication device as claimed in claim 15, wherein the first end of the human body communication module is implemented through the first part of the camera metal frame.

17. The communication device as claimed in claim 15, wherein the second end of the human body communication module is implemented through the second part of the camera metal frame.

18. The communication device as claimed in claim 1, further comprising: An inertial measurement unit for determining whether the communication device is operating in a handheld mode or a pocket mode.

19. The communication device as claimed in claim 18, further comprising: An adjustable matching circuit coupled between the inertial measurement unit and the human body communication module, wherein if the communication device is operating in the handheld mode, the adjustable matching circuit will provide a first impedance value to the human body communication module, and if the communication device is operating in the pocket mode, the adjustable matching circuit will provide a second impedance value to the human body communication module.

20. A communication method, comprising the following steps: Providing a radio frequency module, an integration module, a first tuning circuit, a signal transmission line, and a first antenna element, wherein the integration module includes a specific absorption rate sensor and a human body communication module, and the signal transmission line includes a center conductor and an outer conductor; Generating a radio frequency signal through the radio frequency module; Transmitting the radio frequency signal to the first antenna element through the signal transmission line; And Coupling a first end of the human body communication module to the center conductor via the first tuning circuit, and coupling a second end of the human body communication module to the outer conductor.

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