Antenna system, capsule endoscope, and capsule endoscope system

Abstract

The utility model discloses an antenna system, a capsule endoscope and a capsule endoscope system, and the antenna system comprises a first rigid circuit board which is provided with a radio frequency signal processor, a first reference ground and a first inductor which are electrically connected with one another; the second rigid circuit board is provided with a second reference ground and a second inductor which are electrically connected with each other; the first flexible circuit board is provided with a first radiator, the first radiator is electrically connected with the radio frequency signal processor to transmit radio frequency signals, one end of the first radiator is connected to the first reference ground in series through the first inductor, and the other end of the first radiator is connected to the second reference ground through the second inductor. And the other end of the first radiator is connected in series to the second reference ground through the second inductor. The first reference ground and the second reference ground can be electrically connected through the first radiator, and the first radiator serves as a radiator to transmit the radio frequency signal, so that independent arrangement of the radiator is avoided, and the size and the cost pressure are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of medical devices, in particular to an antenna system, a capsule endoscope and a capsule endoscope system. Background Art

[0002] The capsule endoscopes currently available on the market are relatively small in size. There are various electronic devices arranged inside the capsule endoscope, such as an MCU controller, an LED lamp, a camera, a power conversion circuit, a radio frequency signal processor and an antenna, etc.

[0003] Since the antenna requires a certain length of wire routing, in the narrow space of the capsule endoscope, a certain space needs to be planned for the antenna, then the antenna needs to occupy the space of other electronic devices inside the capsule, resulting in very difficult layout of the electronic devices inside the capsule, and the wire routing length of the antenna is also very likely to be insufficient, making it impossible for the antenna to reach the designed resonant frequency point and bandwidth. Summary of the Utility Model

[0004] In order to solve at least one of the above technical problems existing in the prior art, the utility model provides an antenna system, a capsule endoscope including the antenna system, and a capsule endoscope system including the capsule endoscope.

[0005] In a first aspect, the utility model provides an antenna system, including:

[0006] A first rigid circuit board, provided with a radio frequency signal processor, a first reference ground and a first inductor which are electrically connected to each other;

[0007] A second rigid circuit board, provided with a second reference ground and a second inductor which are electrically connected to each other; and

[0008] A first flexible circuit board, provided with a first radiator, the first radiator is electrically connected to the radio frequency signal processor to transmit radio frequency signals, one end of the first radiator is connected in series to the first reference ground through the first inductor, and the other end of the first radiator is connected in series to the second reference ground through the second inductor.

[0009] In a second aspect, the present application provides a capsule endoscope, including a housing and the antenna system as described above, and the antenna system is arranged in a first space surrounded by the housing.

[0010] In a third aspect, the present application provides a capsule endoscope system, including a client and the capsule endoscope as described above, and the capsule endoscope communicates wirelessly with the client through the antenna system.

[0011] In the antenna system provided by the present application, the first radiator of the antenna system is disposed on a first flexible circuit board used for electrically connecting two rigid circuit boards (a first rigid circuit board and a second rigid circuit board), and is serially connected to a first reference ground through a first inductor and serially connected to a second reference ground through a second inductor.

[0012] In the present application, by utilizing the characteristic of the inductor that it conducts low-frequency signals and blocks high-frequency signals, the first radiator can electrically connect the ground signals of different rigid circuit boards (a first reference ground and a second reference ground), enabling the same reference potential points on different rigid circuit boards, which helps reduce the ground loop and improve the signal stability. At the same time, during the process of the first radiator transmitting radio frequency signals, the first inductor and the second inductor will suppress the radio frequency signals transmitted by the first radiator from passing through, causing most of the radio frequency signals to remain on the first radiator and be transmitted through the first radiator, avoiding the absorption of radio frequency signals by the first reference ground and the second reference ground, effectively suppressing high-frequency signals from entering the first reference ground and the second reference ground, reducing noise and interference, and ensuring the performance and reliability of the antenna system.

[0013] In the present application, the ground wire on the first flexible circuit board used for electrically connecting between the first reference ground and the second reference ground is multiplexed as the first radiator. The first radiator does not require an additional flexible circuit board to be realized and has multiple functions. In the first aspect, it can save the space that needs to be reserved for the first radiator in the conventional design, which is beneficial to meeting the small volume requirement of the capsule endoscope. Compared with the conventional design, the saved space can be used for other devices to improve or add product functions. In the second aspect, it effectively reduces the usage amount of the flexible circuit board and lowers the cost of the overall design scheme. In the third aspect, since the first radiator is disposed on the flexible circuit board, the length of the first radiator can be set according to the frequency of the radio frequency signal, which is convenient for achieving the designed resonant frequency point and bandwidth requirements and can better realize the performance of higher-frequency or lower-frequency antennas. Description of the Drawings

[0014] The drawings are used to provide a further understanding of the embodiments of the present utility model and constitute a part of the specification. They are used together with the following specific embodiments to explain the embodiments of the present utility model, but do not constitute a limitation to the embodiments of the present utility model.

[0015] Figure 1 It is a schematic structural diagram of the capsule endoscope system provided by the present application;

[0016] Figure 2 is Figure 1 a schematic cross-sectional structural diagram of the capsule endoscope shown along its axial direction;

[0017] Figure 3 is Figure 2 a schematic structural diagram of the antenna system in the capsule endoscope shown;

[0018] Figure 4 For Figure 3 the circuit schematic diagram of the antenna system shown;

[0019] Figure 5 For Figure 3 the structural schematic diagram of the antenna system in the changed implementation manner shown;

[0020] Figure 6 For Figure 3 the structural schematic diagram of the first flexible circuit board in the changed implementation manner shown. Specific implementation manner

[0021] In order to make the purpose, technical solution and advantages of the present utility model clearer, the present utility model will be further described in detail below in conjunction with the accompanying drawings and implementation manners. It should be understood that the specific implementation manners described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0022] The technical solution of this patent will be further described in detail below in conjunction with specific implementation manners.

[0023] In the description of this patent, it should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this patent and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of this patent.

[0024] In the description of this patent, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", "connection", "setting" should be understood in a broad sense. For example, it can be fixedly connected and set, or detachably connected and set, or integrally connected and set. For those of ordinary skill in the art, the specific meanings of the above terms in this patent can be understood according to specific circumstances.

[0025] Definition:

[0026] Axial direction: the direction parallel to the axis of the capsule endoscope 10. In this application, the axis of the capsule endoscope 10 is the direction of the line between the first end 101 and the second end 102.

[0027] Circumferential direction: perpendicular to the axial direction and the direction around the axis.

[0028] Radial direction: perpendicular to the axial direction and the linear direction along the diameter or radius of the capsule endoscope 10.

[0029] The present application provides an antenna system 100, which is used to receive or transmit radio frequency signals for wireless communication with external devices. The antenna system 100 is applicable to small-sized devices with wireless communication functions and can be applied in fields such as smart cities, medical devices, industrial automation, and monitoring. In the present application, the antenna system 100 is taken as an example in the capsule endoscope system 1 in medical devices. It can be understood that the antenna system 100 can also be applied in the fields mentioned above or not mentioned above.

[0030] As Figure 1 described, the capsule endoscope system 1 includes a capsule endoscope 10 and a client 20. An antenna system 100 is provided in the capsule endoscope 10, and wireless communication is carried out with the client 20 through the antenna system 100 therein.

[0031] The client 20 can include, for example, at least one of a mobile phone, a wearable device, an Internet of Things device, a tablet computer, a computer with a wireless transceiver function, a virtual reality terminal device, an augmented reality terminal device, a wireless terminal device in industrial control, and a wireless terminal device in remote surgery, but is not limited thereto. The client 20 can control the capsule endoscope 10 to perform at least one function such as moving, image acquisition, image processing, and wireless image transmission through wireless communication.

[0032] As Figures 1 to 4 shown, the capsule endoscope 100 includes a housing 800 and a plurality of electronic devices arranged in the housing 800, such as a first lens 950, an antenna system 100, a battery 980, a magnet 970, and a second lens 960. The housing 800 includes a first end 801 and a second end 802. The housing 800 encloses a closed first space H1. In the first space H1, the first lens 950 is arranged adjacent to the first end 801 relative to other devices, and the second lens 960 is arranged adjacent to the second end 802 relative to other devices. The antenna system 100 is arranged between the first lens 950 and the second lens 960. The side wall of the housing 800 and the antenna system 100 enclose a second space H2 in the capsule endoscope 10. The battery 980 and the magnet 970 are arranged in the second space.

[0033] In a modified embodiment, the capsule endoscope 10 only includes the first lens 950 and does not provide the second lens 960; in a modified embodiment, the capsule endoscope 10 does not provide the magnet 970. It can be understood that the arrangement of components in the capsule endoscope 100 can be different from that Figure 2 shown and is not limited thereto. In some embodiments, the capsule endoscope 100 may further include other components not mentioned above.

[0034] As Figure 3As shown, the antenna system 100 includes: a first rigid circuit board 110, a second printed circuit board 120, and a first flexible circuit board 170 electrically connected between the two.

[0035] The first rigid circuit board 110 is provided with a radio frequency signal processor 111, a first reference ground G1, and a first inductor L1 that are electrically connected to each other; the second rigid circuit board 120 is provided with a second reference ground G2 and a second inductor L2 that are electrically connected to each other; the first flexible circuit board 160 is provided with a first radiator 161. The first radiator 161 is electrically connected to the radio frequency signal processor 111 to transmit radio frequency signals. One end of the first radiator 161 is serially connected to the first reference ground G1 through the first inductor L1, and the other end of the first radiator 161 is serially connected to the second reference ground G2 through the second inductor L2.

[0036] In the antenna system 100 provided in this application, the first radiator 161 of the antenna system 100 is disposed on the first flexible circuit board 160 for electrically connecting between two rigid circuit boards (the first rigid circuit board 110 and the second rigid circuit board 120), and is serially connected to the first reference ground G1 through the first inductor L1 and serially connected to the second reference ground G2 through the second inductor L2.

[0037] In this application, by utilizing the characteristic of the inductor to pass low-frequency signals and block high-frequency signals, the first radiator 161 can electrically connect the ground signals (the first reference ground G1 and the second reference ground G2) of different rigid circuit boards, enabling the same reference potential points on different rigid circuit boards, which helps reduce the ground loop and improve the signal stability; at the same time, during the process of the first radiator 161 transmitting radio frequency signals, the first inductor L1 and the second inductor L2 will inhibit the radio frequency signals transmitted by the first radiator 161 from passing through, causing most of the radio frequency signals to remain on the first radiator 161 and be transmitted through the first radiator 161, avoiding the absorption of radio frequency signals by the first reference ground G1 and the second reference ground G2, effectively suppressing high-frequency signals from entering the first reference ground G1 and the second reference ground G2, reducing noise and interference, and ensuring the performance and reliability of the antenna system.

[0038] In this application, the ground wire on the first flexible circuit board 160 used for electrically connecting between the first reference ground G1 and the second reference ground G2 is multiplexed as the first radiator 161. The first radiator 161 does not require the use of an additional flexible circuit board to be implemented and has various functions. In the first aspect, it can save the space that needs to be reserved for the first radiator 161 in the conventional design, which is beneficial to meeting the small volume requirement of the capsule endoscope 10. Compared with the conventional design, the saved space can be used for other components to improve or add product functions. In the second aspect, it effectively reduces the usage amount of the flexible circuit board and lowers the cost of the overall design solution. In the third aspect, the first radiator 161 is disposed on the flexible circuit board, and the length of the first radiator 161 can be set according to the frequency of the radio frequency signal, which is convenient for achieving the designed resonance frequency point and bandwidth requirements and can better implement the performance of higher-frequency or lower-frequency antennas.

[0039] A plurality of rigid circuit boards and flexible circuit boards for electrically connecting adjacent rigid circuit boards are provided in the capsule endoscope 10. Specifically, the rigid circuit boards include a first rigid circuit board 110, a second rigid circuit board 120, a third rigid circuit board 130, and a fourth rigid circuit board 140; the flexible circuit boards include a first flexible circuit board 160, a second flexible circuit board 170, and a third flexible circuit board 180.

[0040] Among them, the first flexible circuit board 160 is electrically connected between the first rigid circuit board 110 and the second rigid circuit board 120; the second flexible circuit board 170 is electrically connected between the second rigid circuit board 120 and the third rigid circuit board 130; the third flexible circuit board 180 is electrically connected between the first rigid circuit board 110 and the fourth rigid circuit board 140. It can be understood that the capsule endoscope 10 can be provided with rigid circuit boards and flexible circuit boards having other quantities and connection relationships according to needs.

[0041] A variety of electronic components are carried on the rigid circuit board to implement functions such as controlled movement, image acquisition, and wireless communication. Devices for implementing the above-mentioned various functions are provided on the first rigid circuit board 110 and the second rigid circuit board 120 in the antenna system 100. Electrical connection between the first rigid circuit board 110 and the second rigid circuit board 120 is achieved through the first flexible circuit board 160. The first flexible circuit board 160 is provided with a first radiator 161 for electrically connecting the first reference ground G1 and the second reference ground G2 to each other, and at least one signal line 163 for transmitting signals. Both ends of the signal line 163 are electrically connected to the first rigid circuit board 110 and the second rigid circuit board 120 respectively.

[0042] Both the first rigid circuit board 110 and the second rigid circuit board 120 are plate-shaped and are spaced apart in the axial direction of the capsule endoscope 10. As Figure 2As shown, specifically, in the present embodiment, the first rigid circuit board 110 and the second rigid circuit board 120 are both arranged along the radial direction of the capsule endoscope 10. The first rigid circuit board 110 and the second rigid circuit board 120 are substantially circular, and axially isolate the interior of the capsule endoscope 10 into a first space H2. The first space H2 is surrounded by the mutually facing surfaces of the first rigid circuit board 110 and the second rigid circuit board 120, and the inner surface of the side wall of the housing 800. The battery 980 and the magnet 970 are accommodated in the second space H2.

[0043] The negative electrode of the battery 980 is electrically connected to the first reference ground G1 of the first rigid circuit board 110, and the positive electrode of the battery 980 is electrically connected to the second rigid circuit board 120. Preferably, the negative electrode of the battery 980 can be welded to the first reference ground, and the positive electrode of the battery 980 is welded to the second rigid circuit board 120.

[0044] The first flexible circuit board 160 is connected between the first rigid circuit board 110 and the second rigid circuit board 120 and extends axially in the capsule endoscope 10. Since the first flexible circuit board 160 has flexibility and bends at the joints with the first rigid circuit board 110 and the second rigid circuit board 120 at both ends thereof (one end of the first flexible circuit board 160 bends between the first rigid circuit board 110 and the inner wall of the housing 800, and the other end of the first flexible circuit board 160 bends between the second rigid circuit board 120 and the inner wall of the housing 800), the portion between the two ends of the first flexible circuit board 160 protrudes towards the side wall of the housing 800 relative to its two ends, away from the battery 980 and adjacent to the inner wall of the housing 800. Since the battery 980 includes a conductive material, for example, a grounded aluminum-plastic film is wrapped on the outer surface of some batteries 980, the first radiator 161 being away from the battery 980 can provide a better antenna environment, enabling the first radiator 161 to have a higher height and a wider bandwidth.

[0045] The first reference ground G1 and the second reference ground G2 can each include at least one of a ground wire, a ground plane, or a ground layer.

[0046] Please refer to Figure 2 for reference Figure 5 In Figure 5 the modified embodiment shown, the antenna system 100 is further provided with a second radiator 171 and a third radiator 181 on the basis of the first radiator 161.

[0047] Specifically, the antenna system 100 is provided with a third rigid circuit board 130 and a second flexible circuit board 170. The second flexible circuit board 170 is electrically connected between the second rigid circuit board 120 and the third rigid circuit board 130. The third rigid circuit board 130 is provided with a third reference ground G3 and a third inductor L3 that are electrically connected to each other. The second flexible circuit board 170 is provided with a second radiator 171. One end of the second radiator 171 is connected in series with the first radiator 161 on the second rigid circuit board 120, and the other end of the second radiator 171 is connected in series to the third reference ground G3 through the third inductor L3.

[0048] The second radiator 171 is similar to the first radiator 161 and is connected in series to the third reference ground G3 through the third inductor L3. By using the characteristic of the inductor that allows low-frequency signals to pass through and blocks high-frequency signals, the second radiator 171 can electrically connect the ground signals (the first reference ground G1, the second reference ground G2, and the third reference ground G3) of different rigid circuit boards, enabling the same reference potential points on different rigid circuit boards, which helps reduce the ground loop and improve the signal stability. At the same time, during the process of radio frequency signal transmission by the second radiator 171, the third inductor L3 will suppress the radio frequency signal transmitted by the second radiator 171 from passing through, causing most of the radio frequency signals to remain in the second radiator 171 and be transmitted through the second radiator 171, avoiding the radio frequency signals being absorbed by the third reference ground G3, effectively suppressing high-frequency signals from entering the third reference ground G3, reducing noise and interference, and ensuring the performance and reliability of the antenna system.

[0049] In this application, the ground wire on the second flexible circuit board 170 used for electrically connecting between the second reference ground G2 and the third reference ground G3 is multiplexed as the second radiator 171. The second radiator 171 does not require an additional flexible circuit board to be realized and has multiple functions. In the first aspect, it can save the space that needs to be reserved for the second radiator 171 in the conventional design, which is beneficial to meeting the small volume requirement of the capsule endoscope 10. Compared with the conventional design, the saved space can be used for other components to improve or add product functions. In the second aspect, it effectively reduces the usage amount of the flexible circuit board and lowers the cost of the overall design solution. In the third aspect, since the second radiator 171 is provided on the flexible circuit board, the second radiator 171 can be set according to the frequency of the radio frequency signal, facilitating the achievement of the designed resonance frequency point and bandwidth requirements, and better realizing the performance of higher-frequency or lower-frequency antennas.

[0050] In the above-described embodiments, when the frequency range of the radio frequency signal is 400 MHz - 500 MHz, the inductance values of the first inductor L1, the second inductor L2, and the third inductor L3 are all 36 nH - 360 nH; when the frequency range of the radio frequency signal is 2.4 GHz - 2.5 GHz, the inductance values of the first inductor L1, the second inductor L2, and the third inductor L3 are all 24 nH - 360 nH. It can be understood that the inductance values of the first inductor L1, the second inductor L2, and the third inductor L3 can be set according to the frequency range of the radio frequency signal.

[0051] As Figure 3 described, the first flexible circuit board 160 is provided with a first radiator 161. In some embodiments, the first flexible circuit board 160 is provided with a plurality of first radiators 161, that is, a plurality of microstrip lines are connected in parallel between the first inductor L1 and the second inductor L2, and each microstrip line serves as a first radiator 161.

[0052] Similarly, as Figure 5 described, the second flexible circuit board 170 is provided with a second radiator 171. In some embodiments, the second flexible circuit board 170 is provided with a plurality of second radiators 171, that is, a plurality of microstrip lines are connected in parallel between the first radiator 161 and the third inductor L3, and each microstrip line serves as a second radiator 171.

[0053] Both the first radiator 161 and the second radiator 171 are microstrip lines provided on the flexible circuit board, and their shapes are linear or curved such as serpentine or spiral.

[0054] As Figure 3 shown, the first flexible circuit board 160 is provided with a signal line 163, and the first radiator 161 is arranged adjacent to the edge of the first flexible circuit board 160 with respect to the signal line 163. The first radiator 161 is a microstrip line, the width of the first radiator 161 is w1, and the distance GAP between the first radiator 161 and the adjacent signal line 163 is greater than 3 * w1.

[0055] Similarly, as Figure 5 shown, the second flexible circuit board 170 may be provided with a signal line, and the second radiator 171 is arranged adjacent to the edge of the second flexible circuit board 170 with respect to the signal line. The second radiator 171 is a microstrip line, the width of the second radiator 171 is w2, and the distance between the second radiator 171 and the adjacent signal line 163 is greater than 3 * w2.

[0056] As Figures 3 to 5As shown, the first rigid circuit board 110 includes a capacitor C. A capacitor C is connected in series between the first radiator 161 and the radio frequency signal processor 111. The capacitance of the capacitor C is 22 pF - 360 pF, which can effectively transmit AC signals while blocking or reducing the passage of DC signals, thus ensuring the pure and accurate transmission of the transmitted radio frequency signals. If the radio frequency signal is in the frequency range of 400 MHz - 500 MHz, the capacitance of the capacitor C can be set to 100 pF to 360 pF; if the radio frequency signal is in the frequency range of 2.4 GHz - 2.5 GHz, the capacitance of the capacitor C can be set to 33 pF to 100 pF.

[0057] In some embodiments, a matching circuit is provided between the capacitor C and the radio frequency signal processor 111. The matching circuit can be an L-type, π-type, T-type or other matching network.

[0058] As described above, in the antenna system 100, a radiator is respectively provided on the first flexible circuit board 160 and the second flexible circuit board 170 for the transmission of radio frequency signals. It can be understood that similar radiators can be provided on other flexible circuit boards in the capsule endoscope 10 to increase the length space of the radiator traces. For example, radiators can be provided on all the flexible circuit boards in the antenna system 100, and the number of radiators provided on each flexible circuit board is not limited.

[0059] In Figure 5 In the shown embodiment, radiators are provided on all the flexible circuit boards in the antenna system 100. Specifically, the antenna system 100 includes a fourth rigid circuit board 140 and a third flexible circuit board 180 that are electrically connected to each other. Among them, the third flexible circuit board 180 is electrically connected between the fourth rigid circuit board 140 and the first rigid circuit board 110. The third flexible circuit board 180 is provided with a third radiator 181. The fourth rigid circuit board 140 is provided with a fourth inductor L4 and a fourth reference ground (not shown in the figure, which can be a ground layer electrically connected to the fourth inductor L4) that are electrically connected to each other. One end of the third radiator 181 is connected in series with the first radiator 161 on the first rigid circuit board 160, and the other end of the third radiator 181 is electrically connected to the fourth reference ground through the fourth inductor L4.

[0060] It can be understood that, without contradiction, the specific technical solutions of the first radiator 161 and the second radiator 171 can be applied to the third radiator 181. In some embodiments, the antenna system 100 can be provided with at least one of the first radiator 161, the second radiator 171 and the third radiator 181, or more radiators are provided, which is not limited herein.

[0061] As Figure 6As shown, in the change implementation manner, the first flexible circuit board 160a is provided with a first radiator 161a and a signal line 163a at intervals. Among them Figure 6 the main difference between the first flexible circuit board 160a in Figure 3 and the first flexible circuit board 160 in Figure 6 is that the structure of the first radiator 161a in

[0062] is arranged in a serpentine shape to increase the length space of the first radiator 161's trace. In this implementation manner, the serpentine first radiator 161a includes three straight segments 1611 extending in the length direction of the first flexible circuit board 160a, and two connection segments 1612 that electrically connect adjacent straight segments 1611. In this implementation manner, the connection segment 1612 is straight and extends in the width direction of the first flexible circuit board 160a.

[0063] In other implementation manners, the connection segment 1612 can be straight or curved; the number of straight segments 1611 in the first radiator 161a can be 1 - 5; other radiators in the antenna system 100 provided by other implementation manners can also adopt a serpentine structure similar to the first radiator 161a.

[0064] The optional implementation manners of the embodiments of the present invention have been described in detail above in conjunction with the drawings. However, the embodiments of the present invention are not limited to the specific details in the above embodiments. Within the scope of the technical concept of the embodiments of the present invention, various simple modifications can be made to the technical solutions of the embodiments of the present invention, and these simple modifications all belong to the protection scope of the embodiments of the present invention.

[0065] In addition, it should be noted that, in the above specific implementation manners, the various specific technical solutions described can be combined in any appropriate manner without contradiction. To avoid unnecessary repetition, the embodiments of the present invention will not separately describe various possible combination manners.

[0066] Furthermore, any combination can be made between various different implementation manners of the embodiments of the present invention, as long as it does not violate the idea of the embodiments of the present invention, and it should also be regarded as the content disclosed by the embodiments of the present invention.

Claims

1. An antenna system, characterized in that: include: A first rigid circuit board is provided with a radio frequency signal processor, a first reference ground and a first inductor which are electrically connected to each other; A second rigid circuit board is provided with a second reference ground and a second inductor which are electrically connected to each other; as well as A first flexible circuit board is provided with a first radiator, the first radiator is electrically connected to the RF signal processor to transmit a RF signal, one end of the first radiator is connected in series to the first reference ground through the first inductor, and the other end of the first radiator is connected in series to the second reference ground through the second inductor.

2. The antenna system according to claim 1, characterized in that The antenna system is provided with a third rigid circuit board and a second flexible circuit board, the third rigid circuit board is provided with a third reference ground and a third inductor electrically connected to each other, the second flexible circuit board is provided with a second radiator, one end of the second radiator is connected in series with the first radiator on the second rigid circuit board, and the other end of the second radiator is connected in series to the third reference ground through the third inductor.

3. The antenna system according to claim 2, characterized in that The frequency range of the radio frequency signal is 400 MHz-500 MHz, and the inductance values ​​of the first inductor, the second inductor and the third inductor are all 36 nH-360 nH; or The frequency range of the radio frequency signal is 2.4 GHz-2.5 GHz, and the inductance values ​​of the first inductor, the second inductor and the third inductor are all 24 nH-360 nH.

4. The antenna system according to claim 2, characterized in that The first flexible circuit board is provided with a plurality of the first radiators; and / or The second flexible circuit board is provided with a plurality of the second radiators.

5. The antenna system according to claim 2 or 4, characterized in that: The first radiator is in a straight line or a curved line; and / or The second radiator is in a straight line or a curved line.

6. The antenna system according to claim 2 or 4, characterized in that: The first radiator and / or the second radiator is in a snake shape.

7. The antenna system according to any one of claims 1 to 4, characterized in that: The first flexible circuit board is provided with a signal line, and the first radiator is arranged adjacent to an edge of the first flexible circuit board relative to the signal line.

8. The antenna system according to claim 7, characterized in that The first radiator is a microstrip line, the width of the first radiator is w1, and the distance between the first radiator and the adjacent signal line is greater than 3*w1.

9. The antenna system according to claim 2 or 4, characterized in that: The second flexible circuit board is provided with a signal line, and the second radiator is arranged adjacent to an edge of the second flexible circuit board relative to the signal line.

10. The antenna system according to claim 9, characterized in that The second radiator is a microstrip line, the width of the second radiator is w2, and the spacing between the second radiator and the adjacent signal line is greater than 3*w2.

11. The antenna system according to any one of claims 1 to 4, characterized in that: The first rigid circuit board includes a capacitor, which is connected in series between the first radiator and the radio frequency signal processor, and the capacitance of the capacitor is 22pF-360pF.

12. The antenna system according to claim 11, characterized in that A matching circuit is arranged between the capacitor and the radio frequency signal processor.

13. A capsule endoscope, characterized in that: The capsule endoscope comprises a shell and an antenna system as described in any one of claims 1 to 12, and the antenna system is arranged in a first space enclosed by the shell.

14. The capsule endoscope according to claim 13, characterized in that: The capsule endoscope includes a battery, the first rigid circuit board and the second rigid circuit board are spaced apart in the axial direction of the capsule endoscope, and the battery is sandwiched between the first rigid circuit board and the second rigid circuit board; One end of the first flexible circuit board is bent between the first rigid circuit board and the inner wall of the shell, and the other end of the first flexible circuit board is bent between the second rigid circuit board and the inner wall of the shell. The portion between the two ends of the first flexible circuit board is farther away from the battery than its two ends and closer to the inner wall of the shell.

15. A capsule endoscope system, characterized in that: The device comprises a client and the capsule endoscope as claimed in claim 13 or 14, wherein the capsule endoscope performs wireless communication with the client via the antenna system.

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