Antenna systems and terminal equipment

Abstract

This invention discloses an antenna system and a terminal device. The antenna system includes an antenna body, a switching unit, a communication module, a signal transmission line, and a control module. The switching unit is disposed on the antenna body and connected between a first end and a second end of the antenna body. The switching unit connects the first and second ends of the antenna body when it is on and disconnects the first and second ends when it is off, thereby adjusting the shape of the antenna body. The communication module is electrically connected to the antenna body and the switching unit via the signal transmission line and is used to control the antenna body to communicate. The control module is electrically connected to the signal transmission line and is used to transmit control signals to the switching unit via the signal transmission line to control the switching unit to be on or off. The technical solution of this invention facilitates the miniaturization of the antenna system and reduces its cost.

Description

Technical Field

[0001] The present invention relates to the field of antenna technology, and in particular to an antenna system and a terminal device. Background Technology

[0002] An antenna switch is used to switch the operating state of an antenna. For example, an antenna switch can be used to switch the operating frequency band of an antenna as well as its receive and transmit states. Currently, antenna switches are being used in an increasingly wide range of applications.

[0003] Due to the power and control link requirements of the antenna switch, when the antenna of the terminal device is far from the motherboard, the existing technology usually provides a separate carrier board for the antenna and antenna switch, and connects the motherboard and the antenna switch on the carrier board through a ribbon cable. This allows the motherboard to supply power to the antenna switch and control it through the ribbon cable. This results in the antenna and antenna switch occupying a large area, and the ribbon cable setup also increases the cost. Summary of the Invention

[0004] This invention provides an antenna system and a terminal device to achieve miniaturization of the antenna system and reduce its cost.

[0005] In a first aspect, embodiments of the present invention provide an antenna system, comprising:

[0006] The antenna body and the switching unit are provided. The switching unit is disposed on the antenna body and connected between the first end and the second end of the antenna body. The switching unit is used to connect the first end and the second end of the antenna body when it is turned on, and to disconnect the first end and the second end of the antenna body when it is turned off, so as to adjust the shape of the antenna body.

[0007] A communication module is electrically connected to the antenna body and the switching unit via a signal transmission line, and is used to control the antenna body to perform communication.

[0008] A control module, electrically connected to the signal transmission line, is used to transmit control signals to the switching unit through the signal transmission line to control the switching unit to be turned on or off.

[0009] Optionally, the switching unit includes an antenna switch, and the antenna system further includes a first signal isolation module, a second signal isolation module, and a first filtering module;

[0010] The antenna switch is disposed on the antenna body and connected between the first end and the second end of the antenna body;

[0011] The first signal isolation module is connected between the communication module and the signal transmission line, and the second signal isolation module is connected between the signal transmission line and the antenna body. The first signal isolation module and the second signal isolation module are respectively used to isolate the control signals transmitted by the control module.

[0012] One end of the first filtering module is connected to the signal transmission line and the antenna switch, and the other end of the first filtering module is grounded. The first filtering module is used to perform filtering.

[0013] Optionally, the antenna body includes a first antenna section and a second antenna section;

[0014] The first end of the first antenna section serves as the first end of the antenna body, the first end of the second antenna section serves as the second end of the antenna body, and the antenna switch is connected between the first end of the first antenna section and the first end of the second antenna section.

[0015] Optionally, the second signal isolation module and the first filtering module are disposed between the area enclosed by the first antenna section, the antenna switch and the second antenna section.

[0016] Optionally, the first antenna section includes a first branch section, a second branch section, a third branch section and a fourth branch section, and the second antenna section is a block antenna section;

[0017] The first branch and the fourth branch extend along a first direction, and the second branch and the third branch extend along a second direction. The first direction and the second direction intersect. The first end of the second branch and the first end of the third branch are respectively connected to the two ends of the first branch, and the second branch and the third branch are located on the same side of the first branch. The second end of the second branch is connected to the second end of the second antenna section, and the second end of the third branch is connected to the first end of the fourth branch. The antenna switch is connected between the first end of the second antenna section and the second end of the fourth branch.

[0018] The second signal isolation module and the first filtering module are disposed between the area enclosed by the first branch, the second branch, the third branch, the fourth branch, the antenna switch, and the second antenna.

[0019] Optionally, the first signal isolation module includes a first capacitor, the second signal isolation module includes a second capacitor and a first inductor, and the first filtering module includes a third capacitor;

[0020] The first capacitor is connected between the communication module and the signal transmission line. The second capacitor and the first inductor are connected in series between the signal transmission line and the antenna body. The first terminal of the third capacitor is connected to the second end of the signal transmission line and the antenna switch. The second terminal of the third capacitor is grounded.

[0021] Optionally, the antenna system further includes a second filtering module, which is connected in series between the control module and the signal transmission line, and is used to perform filtering.

[0022] Optionally, the second filtering module includes a second inductor connected between the control module and the signal transmission line.

[0023] Optionally, the signal transmission line is a coaxial cable.

[0024] Secondly, embodiments of the present invention also provide a terminal device, including the antenna system described in the first aspect.

[0025] The antenna system and terminal device provided in this invention, by setting the switching unit on the antenna body and setting the control module to connect the switching unit to the antenna body and the switching unit through the signal transmission line between the communication module and the switching unit, realizes the control module to control the working state of the switching unit, thereby adjusting the working state of the antenna body. Even when the distance between the control module and the antenna body is far, it is not necessary to set the switching unit on the carrier board, and it is not necessary to add an extra ribbon cable between the control module and the switching unit to control the working state of the switching unit. This is beneficial to the miniaturization of the antenna system and the reduction of the cost of the antenna system.

[0026] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the structure of an antenna system provided in an embodiment of the present invention;

[0029] Figure 2 yes Figure 1 The circuit diagram of the antenna system in the image;

[0030] Figure 3 This is a schematic diagram of another antenna system provided in an embodiment of the present invention;

[0031] Figure 4 yes Figure 3 A circuit schematic diagram of an antenna system in [the context of the text].

[0032] Figure 5 yes Figure 3 Another circuit diagram of the antenna system in the image. Detailed Implementation

[0033] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0034] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0035] Figure 1 This is a schematic diagram of an antenna system provided in an embodiment of the present invention, specifically a top view of the antenna system. Figure 2 yes Figure 1 The circuit diagram of the antenna system in the image. Combined with... Figure 1 and Figure 2 The antenna system includes: antenna body 10, switching unit 20, communication module 30, signal transmission line 40, and control module 50. Figure 1 (Not shown in the image).

[0036] The switching unit 20 is disposed on the antenna body 10 and connected between the first and second ends of the antenna body 10. The switching unit 20 connects the first and second ends of the antenna body 10 when it is on and disconnects them when it is off, thereby adjusting the shape of the antenna body 10. The communication module 30 is electrically connected to the antenna body 10 and the switching unit 20 via a signal transmission line 40, and is used to control the antenna body 10 to communicate. The control module 50 is electrically connected to the signal transmission line 40 and is used to transmit control signals to the switching unit 20 via the signal transmission line 40 to control the switching unit 20 to be on or off.

[0037] Specifically, the switching unit 20 is used to switch the operating state of the antenna body 10. For example, the switching unit 20 can switch the operating frequency band and receiving / transmitting state of the antenna body 10 by adjusting the shape of the antenna body 10. The antenna body 10 includes an antenna, which can be a patch antenna. The switching unit 20 can be directly disposed on the antenna body 10, and one end of the switching unit 20 is electrically connected to the first end of the antenna body 10, and the other end of the switching unit 20 is electrically connected to the second end of the antenna body 10.

[0038] The antenna body 10 can have various shapes. Figure 1 The diagram illustrates the case where the antenna body 10 has a non-closed shape. When the switching unit 20 is off, the antenna body 10 is a non-closed shape. When the switching unit 20 is on, the two ends of the antenna body 10 are electrically connected through the switching unit 20, making the antenna body 10 and the switching unit 20 form a closed shape. This results in different overall shapes of the antenna body 10 when the switching unit 20 is on and off, allowing the shape of the antenna body 10 to be adjusted by the switching unit 20, thereby switching the operating frequency band and receiving / transmitting states of the antenna body 10.

[0039] The communication module 30 can be a radio frequency (RF) module. The communication module 30 is electrically connected to the antenna body 10 via a signal transmission line 40 to control the antenna body 10 to transmit RF signals, or to receive RF signals via the signal transmission line 40 and the antenna body 10, thereby controlling the antenna body 10 to perform communication. The control module 50 is used to control the switching unit 20. For example, when the antenna system is applied to terminal devices such as mobile phones, the control module 50 can be a control module on the motherboard of the terminal device, such as a central processing unit (CPU). The communication module 30 is electrically connected to the switching unit 20 via the signal transmission line 40, and the control module 50 is electrically connected to the signal transmission line 40, enabling the control module 50 to achieve electrical connection with the switching unit 20 via the signal transmission line 40. This allows the control module 50 to transmit control signals and power signals to the switching unit 20 via the signal transmission line 40 to control the switching unit 20 to turn on or off.

[0040] The technical solution provided by this invention, by setting the switching unit on the antenna body and setting the control module to connect the switching unit to the antenna body and the switching unit through the signal transmission line between the communication module and the switching unit, realizes the control module to control the working state of the switching unit, thereby adjusting the working state of the antenna body. Even when the distance between the control module and the antenna body is far, it is not necessary to set the switching unit on the carrier board, and it is not necessary to add an extra ribbon cable between the control module and the switching unit to control the working state of the switching unit. This is beneficial to the miniaturization of the antenna system and the reduction of the cost of the antenna system.

[0041] Figure 3 This is a schematic diagram of another antenna system provided in an embodiment of the present invention, specifically a top view of the antenna system. Figure 4 yes Figure 3 A circuit schematic of an antenna system. Combined with... Figure 3 and Figure 4 Optionally, based on the above embodiments, the switching unit includes an antenna switch 210, and the antenna system further includes a first signal isolation module 60. Figure 3 (Not shown in the image) A second signal isolation module 70 and a first filter module 80. An antenna switch 210 is disposed on the antenna body 10 and connected between the first end and the second end of the antenna body 10. The first signal isolation module 60 is connected between the communication module 30 and the signal transmission line 40, and the second signal isolation module 70 is connected between the signal transmission line 40 and the antenna body 10. The first signal isolation module 60 and the second signal isolation module 70 are used to isolate the control signals transmitted by the control module 50, respectively. One end of the first filter module 80 is connected to the signal transmission line 40 and the antenna switch 210, and the other end of the first filter module 80 is grounded. The first filter module 80 is used for filtering.

[0042] Specifically, the antenna switch 210 can be a radio frequency switch. By controlling the on and off states of the antenna switch 210, the electrical connection between the first and second ends of the antenna body 10 can be controlled, thereby switching the operating frequency band and receiving / transmitting states of the antenna body 10 by adjusting its shape. The communication module 30 is connected to the antenna body 10 through the first signal isolation module 60, the signal transmission line 40, and the second signal isolation module 70, and is also connected to the antenna switch 210 through the first signal isolation module 60 and the signal transmission line 40. The control signals and power signals transmitted by the control module 50 to the antenna switch 210 through the signal transmission line 40 can be DC signals. The first signal isolation module 60 can be used to isolate the signals transmitted by the control module 50 to prevent current backflow into the communication module 30. The second signal isolation module 70 can be used to isolate the signals transmitted by the control module 50 to protect the antenna body 10. The first filter module 80 is used for filtering to remove interference from the signals transmitted by the control module 50 that could affect communication.

[0043] Combination Figure 3 and Figure 4 Optionally, the antenna body 10 includes a first antenna section 110 and a second antenna section 120; the first end of the first antenna section 110 serves as the first end of the antenna body 10, the first end of the second antenna section 120 serves as the second end of the antenna body 10, and the antenna switch 210 is connected between the first end of the first antenna section 110 and the first end of the second antenna section 120.

[0044] For example, both the first antenna section 110 and the second antenna section 120 can be sheet antennas, and the second antenna section 120 can be grounded. One end of the antenna switch 210 is disposed on the first end of the first antenna section 110, and the other end of the antenna switch 210 is disposed on the first end of the second antenna section 120. The second ends of the first antenna section 110 and the second ends of the second antenna section 120 can be connected. When the antenna switch 210 is off, the second end of the first antenna section 110 is connected to the second end of the second antenna section 120, and the first antenna section 110 and the second antenna section 120 are generally non-closed. When the antenna switch 210 is on, the first end of the first antenna section 110 and the first end of the second antenna section 120 are electrically connected through the antenna switch 210, so that the first antenna section 110 and the second antenna section 120 generally form a closed pattern. Therefore, when the antenna switch 210 is on and off, the overall shape of the first antenna section 110 and the second antenna section 120 is different, and the corresponding operating state is also different.

[0045] In other embodiments, the first antenna section 110 and the second antenna section 120 may also be independent antenna sections, that is, the first end of the first antenna section 110 and the first end of the second antenna section 120 are connected by the antenna switch 210, but other areas of the first antenna section 110 and the second antenna section 120 are not connected, and the two are independent of each other when the antenna switch 210 is turned off.

[0046] Combination Figure 3 and Figure 4 Optionally, the second signal isolation module 70 and the first filter module 80 are disposed between the area enclosed by the first antenna section 110, the antenna switch 210, and the second antenna section 120. By utilizing the area enclosed by the first antenna section 110, the antenna switch 210, and the second antenna section 120 to house the second signal isolation module 70 and the first filter module 80, it is not necessary to utilize additional space outside the first antenna section 110, the antenna switch 210, and the second antenna section 120 to house the second signal isolation module 70 and the first filter module 80, which is beneficial for the miniaturization of the antenna system.

[0047] The specific structures of the first antenna section 110 and the second antenna section 120 can vary; one such example will be described below. (See also...) Figure 3 Optionally, the first antenna section 110 includes a first branch section 111, a second branch section 112, a third branch section 113, and a fourth branch section 114, and the second antenna section 120 is a block antenna section; the first branch section 111 and the fourth branch section 114 extend along a first direction X, and the second branch section 112 and the third branch section 113 extend along a second direction Y, the first direction X and the second direction Y intersect, the first end of the second branch section 112 and the first end of the third branch section 113 are respectively connected to the two ends of the first branch section 111, and the second branch section 112 and the third branch section 113 are located on the same side of the first branch section 111. The second end of the second branch 112 is connected to the second end of the second antenna section 120, the second end of the third branch 113 is connected to the first end of the fourth branch 114, the second end of the fourth branch 114 serves as the first end of the first antenna section 110, and the antenna switch 210 is connected between the first end of the second antenna section 120 and the second end of the fourth branch 114; the second signal isolation module 70 and the first filtering module 80 are disposed between the area enclosed by the first branch 111, the second branch 112, the third branch 113, the fourth branch 114, the antenna switch 210, and the second antenna section 120.

[0048] For example, the first branch 111 and the fourth branch 114 can be strip antenna sections, and the second branch 112 and the third branch 113 can be strip antenna sections or block antenna sections. The fourth branch 114 and the second antenna section 120 can be arranged at a certain distance, so that the second antenna section 120, the second branch 112, the first branch 111, the third branch 113 and the fourth branch 114 connected in sequence form a non-closed pattern. One end of the antenna switch 210 is provided on the first end of the second antenna section 120, and the other end of the antenna switch 210 is provided on the second end of the fourth branch 114. When the antenna switch 210 is turned off, the first end of the second antenna section 120 and the second end of the fourth branch 114 are disconnected, and the antenna body 10 forms a non-closed pattern. When the antenna switch 210 is turned on, the first end of the second antenna section 120 and the second end of the fourth branch section 114 are electrically connected through the antenna switch 210, and the antenna body 10 forms a closed shape. This results in different overall shapes of the antenna body 10 when the antenna switch 210 is turned on and off, and correspondingly different operating states. By placing the second signal isolation module 70 and the first filter module 80 within the area enclosed by the first branch section 111, the second branch section 112, the third branch section 113, the fourth branch section 114, the antenna switch 210, and the second antenna section 120, there is no need to utilize additional space outside the antenna body 10 and the antenna switch 210 to house the second signal isolation module 70 and the first filter module 80, which is beneficial for the miniaturization of the antenna system.

[0049] See Figure 4 Optionally, the antenna system further includes a second filtering module 100, which is connected in series between the control module 50 and the signal transmission line 40. The second filtering module 100 is used to filter out the interference caused by the signal transmitted by the control module 50 to the communication.

[0050] Figure 5 yes Figure 3 Another circuit diagram of the antenna system is shown. See [link / reference]. Figures 3 to 5 Based on the above embodiments, optionally, the first signal isolation module 60 includes a first capacitor C1, the second signal isolation module 70 includes a second capacitor C2 and a first inductor L1, and the first filtering module 80 includes a third capacitor C3; the first capacitor C1 is connected between the communication module 30 and the signal transmission line 40, the second capacitor C2 and the first inductor L1 are connected in series between the signal transmission line 40 and the antenna body 10, the first terminal of the third capacitor C3 is connected to the second terminal of the signal transmission line 40 and the antenna switch 210, and the second terminal of the third capacitor C3 is grounded. The second filtering module 100 includes a second inductor L2, which is connected between the control module 50 and the signal transmission line 40.

[0051] Specifically, the first capacitor C1 is used to isolate the signal transmitted by the control module 50 to prevent current from flowing back into the communication module 30. The second capacitor C2 is used to isolate the signal transmitted by the control module 50 to protect the antenna body 10. The first inductor L1, the second inductor L2, and the third capacitor C3 are used for filtering to remove interference caused by the signal transmitted by the control module 50 to the communication. The first inductor L1, the second capacitor C2, and the third capacitor C3 can be disposed within the area enclosed by the first branch 111, the second branch 112, the third branch 113, the fourth branch 114, the antenna switch 210, and the second antenna section 120. This eliminates the need to utilize additional space outside the antenna body 10 and the antenna switch 210 to accommodate the first inductor L1, the second capacitor C2, and the third capacitor C3, which is beneficial for miniaturization of the antenna system.

[0052] See Figures 1 to 5Based on the above embodiments, the signal transmission line 40 is a coaxial cable. By setting the signal transmission line 40 to a coaxial cable, the communication module 30 can control the antenna body 10 for communication via the coaxial cable, and the control module 50 can transmit control signals to the antenna switch 210 via the coaxial cable. When the antenna system is applied to terminal devices such as mobile phones, and the control module 50 is mounted on the motherboard, even if the control module 50 is far from the antenna body 10 and the antenna switch 210, the control module 50 can still be electrically connected to the antenna switch 210 via the coaxial cable. This eliminates the need to mount the antenna switch 210 on the carrier board and eliminates the need for additional ribbon cables between the control module 50 and the antenna switch 210 to control the working state of the antenna switch 210, which is beneficial for miniaturizing the antenna system and reducing its cost.

[0053] It should be noted that, Figure 1 and Figure 3 Only one shape of the antenna body 10 is shown; in practical applications, the shape of the antenna body 10 is not limited to this. In some embodiments, the antenna body 10 can be configured as a sheet antenna, and its shape can satisfy the following: when the antenna switch 210 is off, the antenna body 10 is a non-closed shape; when the antenna switch 210 is on, the antenna body 10 and the antenna switch 210 together form a closed shape. Based on this, in other embodiments, the shape of the antenna body 10 can be configured such that the antenna body 10 and the antenna switch 210 together can enclose a certain area, so that the second signal isolation module 70 and the first filtering module 80 can be disposed between the area enclosed by the antenna body 10 and the antenna switch 210.

[0054] in addition, Figure 2 , Figure 4 and Figure 5 These are circuit diagrams of antenna systems, not actual structural diagrams. Figure 2 , Figure 4 and Figure 5 The antenna body 10 and antenna switch 210 in the text are only used to indicate that the overall shape and working state of the antenna body 10 are different when the antenna switch 210 is turned on or off. For the specific structure, connection relationship and setting method of the antenna body 10 and antenna switch 210, please refer to... Figure 1 and Figure 3 Please understand the above explanation.

[0055] This invention also provides a terminal device, which includes the antenna system described in any of the above embodiments. The terminal device can be an electronic device with communication functions, such as a mobile phone or tablet computer. The terminal device provided by this invention includes the antenna system described in any of the above embodiments, and therefore has the corresponding functional structure and beneficial effects of an antenna system, which will not be elaborated further here.

[0056] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. An antenna system, characterized by The antenna system comprises an antenna body and a switch unit arranged on the antenna body and connected between a first end and a second end of the antenna body, the switch unit being used to connect the first end and the second end of the antenna body when turned on and disconnect the first end and the second end of the antenna body when turned off, so as to adjust the shape of the antenna body. A communication module is electrically connected to the antenna body and the switch unit through a signal transmission line and used to control the antenna body to communicate. A control module is electrically connected to the signal transmission line and used to transmit a control signal to the switch unit through the signal transmission line, so as to control the switch unit to be turned on or turned off. The switch unit comprises an antenna switch, and the antenna system further comprises a first signal isolation module, a second signal isolation module and a first filter module. The antenna switch is arranged on the antenna body and connected between the first end and the second end of the antenna body. The first signal isolation module is connected between the communication module and the signal transmission line, the second signal isolation module is connected between the signal transmission line and the antenna body, and the first signal isolation module and the second signal isolation module are respectively used to isolate the control signal transmitted by the control module. One end of the first filter module is connected to the signal transmission line and the antenna switch, and the other end of the first filter module is grounded, and the first filter module is used for filtering. When the switch unit is turned off, the antenna body is in a non-enclosed shape, and when the switch unit is turned on, the antenna body and the antenna switch form an enclosed shape as a whole. The antenna body comprises a first antenna part and a second antenna part.

2. The antenna system of claim 1, wherein, A first end of the first antenna part serves as a first end of the antenna body, a first end of the second antenna part serves as a second end of the antenna body, and the antenna switch is connected between the first end of the first antenna part and the first end of the second antenna part. The second signal isolation module and the first filter module are arranged between a region enclosed by the first antenna part, the antenna switch and the second antenna part.

3. The antenna system of claim 2, wherein, The first antenna part comprises a first branch part, a second branch part, a third branch part and a fourth branch part, and the second antenna part is a block-shaped antenna part.

4. The antenna system of claim 3, wherein, The first branch part and the fourth branch part extend along a first direction, the second branch part and the third branch part extend along a second direction, the first direction and the second direction intersect, a first end of the second branch part and a first end of the third branch part are respectively connected to two ends of the first branch part, and the second branch part and the third branch part are located on the same side of the first branch part, a second end of the second branch part is connected to a second end of the second antenna part, a second end of the third branch part is connected to a first end of the fourth branch part, and the antenna switch is connected between the first end of the second antenna part and the second end of the fourth branch part. ​ The second signal isolation module and the first filter module are arranged between a region enclosed by the first branch, the second branch, the third branch, the fourth branch, the antenna switch and the second antenna part.

5. The antenna system of claim 1, wherein, The first signal isolation module comprises a first capacitor, the second signal isolation module comprises a second capacitor and a first inductor, and the first filter module comprises a third capacitor. The first capacitor is connected between the communication module and the signal transmission line, the second capacitor and the first inductor are connected in series between the signal transmission line and the antenna body, a first pole of the third capacitor is connected to a second end of the signal transmission line and the antenna switch, and a second pole of the third capacitor is grounded.

6. The antenna system of claim 1, wherein, A second filter module is further included, which is connected in series between the control module and the signal transmission line, and is used for filtering.

7. The antenna system of claim 6, wherein, The second filter module comprises a second inductor, which is connected between the control module and the signal transmission line.

8. The antenna system of any of claims 1-7, wherein, The signal transmission line is a coaxial cable.

9. A terminal device, comprising: An antenna system according to any one of claims 1-8 is included.

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