Frequency-adjustable band-pass filtering system and electronic equipment

Abstract

The utility model relates to a frequency-adjustable band-pass filtering system and electronic equipment. The frequency-adjustable band-pass filtering system comprises a filter inductor, a one-out-of-multiple switch module, a control module and a plurality of filter capacitors, the filter inductor is connected between the WIFI signal generating end and the WIFI antenna; the single-path end of the one-out-of-multiple switch module is connected between the filter inductor and the WIFI antenna, the multi-path selection end of the one-out-of-multiple switch module is connected with one end of each filter capacitor, and the control end of the one-out-of-multiple switch module is connected with the control module; the other end of each filter capacitor is grounded. Different control signals can be adaptively generated according to different to-be-filtered frequencies, so that the filter inductor and different filter capacitors form an LC filter circuit between the WIFI signal generating end and the WIFI antenna, and the to-be-filtered frequencies can still be effectively filtered when the to-be-filtered frequencies change.

Description

Technical Field

[0001] The present application relates to the field of communication technology, and in particular to a frequency-adjustable bandpass filter system and electronic equipment. Background Art

[0002] With the development of wireless communication technology, many communication devices now require cellular and WIFI to work simultaneously. Because cellular and WIFI overlap or are close in some operating frequencies, the design should take into account the application scenarios of cellular and WIFI coexistence to reduce the coexistence interference between cellular and WIFI.

[0003] In the prior art, the coexistence interference between cellular and WIFI can be reduced by using a filtering circuit. A filtering circuit is added to the WIFI antenna end. When cellular and WIFI work at the same time, the WIFI signal of a specific frequency is filtered by the filtering circuit, thereby suppressing the coexistence interference between cellular and WIFI.

[0004] However, the technical solutions for suppressing the coexistence interference between cellular and WIFI in the prior art have poor adaptability due to the fixed component configuration of the filtering circuit, and the filtering circuit can only filter the WIFI signals of a specific frequency, and cannot achieve adaptive configuration for suppressing the coexistence interference of different frequencies. Utility Model Content

[0005] The present application provides a frequency-adjustable bandpass filtering system and electronic device to solve the technical problem that the technical solution for suppressing the coexistence interference between cellular and WIFI in the prior art has poor adaptability and cannot realize the adaptive configuration of suppressing the coexistence interference of different frequencies.

[0006] In a first aspect, the present application provides a frequency-adjustable bandpass filter system, the system comprising a filter inductor, a multiple-choice switch module, a control module, and a plurality of filter capacitors;

[0007] The filter inductor is connected between the WIFI signal generating end and the WIFI antenna; the single-channel end of the multiple-select-one switch module is connected between the filter inductor and the WIFI antenna, the multiple-channel selection end of the multiple-select-one switch module is respectively connected to one end of each of the filter capacitors, and the control end of the multiple-select-one switch module is connected to the control module; the other end of each of the filter capacitors is grounded;

[0008] The control module is used to generate a control signal according to the frequency to be filtered, and input the control signal to the multiple-select-one switch module; wherein the frequency to be filtered is the operating frequency of the current cellular signal;

[0009] The multiple-select-one switch module is used to open the path between the single-way end of the multiple-select-one switch module and the multiple-way selection end of the multiple-select-one switch module indicated by the control signal when receiving the control signal.

[0010] Optionally, the filter inductor includes a first filter inductor and a second filter inductor;

[0011] One end of the first filter inductor is connected to the WIFI signal generating end, the other end of the first filter inductor is respectively connected to one end of the second filter inductor and the single-channel end of the multiple-select-one switch module, and the other end of the second filter inductor is connected to the WIFI antenna.

[0012] Optionally, when the multiple-select-one switch module does not receive the control signal, the path between the single-way end of the multiple-select-one switch module and any one of the multiple-way selection ends of the multiple-select-one switch module is closed.

[0013] Optionally, the multiple-choice-one switch module includes first to i-th multiple-choice-one switch modules, wherein i is an integer greater than 1;

[0014] The single-way ends of the first to i-th multiple-selection switch modules are all connected between the first filter inductor and the second inductor, the control ends of the first to i-th multiple-selection switch modules are all connected to the control module, and the multi-way selection ends of the first to i-th multiple-selection switch modules are connected to one end of the plurality of filter capacitors.

[0015] Optionally, the filter capacitor includes first to jth filter capacitors, wherein j=i×k, k is the number of multiple selection terminals of any one of the multiple-select-one switch modules, and k is an integer greater than 1.

[0016] Optionally, the capacitances of the first to j-th filter capacitors are all different.

[0017] Optionally, the control module includes a detection unit, a processing unit and a sending unit;

[0018] The detection unit is used to detect the current operating frequency of the cellular signal when the cellular signal is injected into the network, and determine the operating frequency of the cellular signal as the frequency to be filtered;

[0019] The processing unit is used to generate the control signal according to the current frequency to be filtered;

[0020] The sending unit is used to send the control signal to the switch module.

[0021] Optionally, the processing unit includes a first acquisition subunit, a second acquisition subunit, a judgment subunit and a generation subunit;

[0022] The first acquisition subunit is used to acquire the operating frequency of the current WIFI signal; wherein the WIFI signal is a signal generated by the WIFI signal generating end;

[0023] The second acquisition subunit is used to acquire the frequency to be filtered;

[0024] The judging subunit is used to judge whether the frequency to be filtered overlaps with the current working frequency of the WIFI signal;

[0025] The generating subunit is used for generating the control signal when the frequency to be filtered overlaps with the current operating frequency of the WIFI signal.

[0026] Optionally, the processing unit further comprises a blocking subunit;

[0027] The blocking subunit is used for preventing the generating subunit from generating the control signal when the frequency to be filtered does not overlap with the current operating frequency of the WIFI signal.

[0028] In a second aspect, the present application provides an electronic device, which includes the frequency-adjustable bandpass filter system described in the first aspect.

[0029] The above technical solution provided by the embodiment of the present application has the following advantages over the prior art: in a frequency-adjustable bandpass filter system provided by the embodiment of the present application, the control module generates a control signal according to the frequency to be filtered, and outputs the control signal to the multiple-choice switch module, and the multiple-choice switch module opens a path between the single-channel end and the multiple-channel selection end indicated by the control signal according to the instruction of the control signal, so that the filter inductor and the filter capacitor form an LC filter circuit between the WIFI signal generating end and the WIFI antenna to filter the frequency to be filtered. The present application can adaptively generate different control signals according to different frequencies to be filtered, so that the filter inductor and different filter capacitors form an LC filter circuit between the WIFI signal generating end and the WIFI antenna, and the frequency to be filtered can be effectively filtered when the frequency to be filtered changes, which can improve the adaptability of the technical solution for suppressing the coexistence interference between cellular and WIFI. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The accompanying drawings herein are incorporated in and constitute a part of the specification, illustrate embodiments consistent with the present utility model, and together with the description, are used to explain the principles of the present utility model.

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the utility model or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0032] One or more embodiments are exemplarily described by pictures in the corresponding drawings, and these exemplified descriptions do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0033] Figure 1 A schematic structural diagram of a frequency-adjustable bandpass filtering system provided in an embodiment of the present application.

[0034] Figure 2 A connection diagram of a frequency-adjustable bandpass filtering system provided in an embodiment of the present application.

[0035] Description of reference numerals:

[0036] 1. Multiple-choice switch module; 2. Control module; L. Filter inductor; L1. First filter inductor; L2. Second filter inductor; C. Filter capacitor; U1. First multiple-choice switch module; U2. Second multiple-choice switch module. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0038] The disclosure below provides many different embodiments or examples for realizing different structures of the present invention. In order to simplify the disclosure of the present invention, the components and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present invention. In addition, the present invention may repeat reference numbers and / or letters in different examples. This repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed.

[0039] In order to solve the technical problem that the technical solution for suppressing coexistence interference between cellular and WIFI in the prior art has poor adaptability and cannot achieve adaptive configuration of coexistence interference suppression at different frequencies, the present application provides a frequency-adjustable bandpass filtering system and electronic device, which can improve the adaptability of the technical solution for suppressing coexistence interference between cellular and WIFI.

[0040] Figure 1 A schematic diagram of a frequency-adjustable bandpass filter system provided in an embodiment of the present application, referring to Figure 1 , a frequency-adjustable bandpass filter system provided in the present application includes a filter inductor L, a multiple-choice switch module 1, a control module 2, and a plurality of filter capacitors C;

[0041] The filter inductor L is connected between the WIFI signal generating end and the WIFI antenna; the single-channel end of the multiple-select-one switch module 1 is connected between the filter inductor L and the WIFI antenna, the multiple-channel selection end of the multiple-select-one switch module 1 is respectively connected to one end of each filter capacitor C, and the control end of the multiple-select-one switch module 1 is connected to the control module 2; the other end of each filter capacitor C is grounded;

[0042] The control module 2 is used to generate a control signal according to the frequency to be filtered, and input the control signal to the multiple-select-one switch module 1; wherein the frequency to be filtered is the working frequency of the current cellular signal;

[0043] The multiple-select-one switch module 1 is used to open the path between the single-way end of the multiple-select-one switch module 1 and the multiple-way selection end of the multiple-select-one switch module 1 indicated by the control signal when receiving the control signal.

[0044] Specifically, the present application provides a frequency-adjustable bandpass filter system that is arranged between a WIFI signal generator and a WIFI antenna. When WIFI starts working on a communication device, the WIFI signal generator generates a WIFI signal and sends or receives the WIFI signal through the WIFI antenna.

[0045] The present application provides a frequency-adjustable bandpass filter system comprising a filter inductor L, a multiple-select-one switch module 1, a control module 2 and a plurality of filter capacitors C.

[0046] The filter inductor L is connected between the WIFI signal generating end and the WIFI antenna; the multiple-select-one switch module 1 includes a single-channel end, multiple multi-channel output ends and a control end. The single-channel end connected to the multiple-select-one switch module 1 is connected between the filter inductor L and the WIFI antenna, and the multiple multi-channel selection ends of the multiple-select-one switch module 1 are respectively connected to one end of each filter inductor L; the control module 2 is connected to the multiple-select-one switch module 1 through the control end of the multiple-select-one switch module 1; the other end of each filter inductor L is grounded.

[0047] The multi-select switch module 1 includes multiple paths, that is, any multi-select terminal and the single-channel terminal of the multi-select switch module 1 can form a path. The multi-select switch module 1 is controlled by the control module 2. When the control module 2 inputs a control signal to the control terminal of the multi-select switch module 1, a path is opened between the single-channel terminal and the multi-select terminal indicated by the control signal, so that the filter inductor L and the filter capacitor C form an LC filter circuit between the WIFI signal generating terminal and the WIFI antenna.

[0048] The control module 2 is used to generate a control signal. After being sent to the multiple-select-one switch module 1, the control signal points to a specific multi-way selection end in the multiple-select-one switch module 1, thereby indicating the path between the specific multi-way selection end and the single-way end of the multiple-select-one switch module 1.

[0049] The control signal is generated based on the frequency to be filtered, which is the operating frequency of the current cellular signal.

[0050] Based on the above embodiments, the implementation principle of this application is:

[0051] The control module 2 generates a control signal according to the operating frequency of the current cellular signal. After the control signal is input into the multiple-choice switch module 1, the multiple-choice switch module 1 opens a path between the single-channel end and the multiple-channel selection end indicated by the control signal, so that the filter inductor L and the filter capacitor C form an LC filter circuit between the WIFI signal generating end and the WIFI antenna to filter the frequency to be filtered. It can be understood that since the control signal is generated based on the frequency to be filtered, the LC filter circuit composed of the filter capacitor C and the filter inductor L connected to the multiple-channel selection end indicated by the control signal is completely suitable for the frequency to be filtered, and the LC filter circuit only filters a specific cellular signal frequency (that is, the operating frequency of the cellular signal at this time). For different frequencies to be filtered, it is only necessary to control the multiple-choice switch module 1 to open different paths.

[0052] In the above embodiment, adaptive suppression of coexistence interference based on the frequency to be filtered is achieved. In order to further improve the suppression effect, in a feasible embodiment of the present application, the filter inductor L includes a first filter inductor L1 and a second filter inductor L2;

[0053] One end of the first filter inductor L1 is connected to the WIFI signal generating end, the other end of the first filter inductor L1 is respectively connected to one end of the second filter inductor L2 and the single-channel end of the multiple-select-one switch module 1, and the other end of the second filter inductor L2 is connected to the WIFI antenna.

[0054] Specifically, refer to Figure 2The first filter inductor L1 and the second filter inductor L2 are connected between the WIFI signal generating end and the WIFI antenna. When the multiple-select switch module 1 opens any one path, the first filter inductor L1, the second filter inductor L2 and the filter capacitor C form a second-order LC filter circuit, which effectively improves the filtering effect.

[0055] In a feasible embodiment of the present application, when the multiple-select-one switch module 1 does not receive a control signal, the path between the single-way end of the multiple-select-one switch module 1 and any one of the multiple-way selection ends of the multiple-select-one switch module 1 is closed.

[0056] Specifically, when the multi-select switch module 1 does not receive the control signal, it means that the current cellular signal does not interfere with the WIFI signal, or the communication device only works in the WIFI environment, and there is no need to filter the cellular signal. At this time, the path between the single-channel end of the multi-select switch module 1 and any one of the multi-channel selection ends of the multi-select switch module 1 is closed, and the LC filter circuit is not formed.

[0057] In order to enable the technical solution provided by the present application to adapt to multiple different frequencies to be filtered, the technical solution provided by the present application can be connected to multiple multi-select switch modules 1, and each multi-select switch module 1 can be connected to multiple filter capacitors C.

[0058] In a feasible embodiment of the present application, the multiple-choice-one switch module 1 includes first to i-th multiple-choice-one switch modules, wherein i is an integer greater than 1;

[0059] The single-channel ends of the first to i-th multiple-selection switch modules are all connected between the first filter inductor L1 and the second filter inductor L2, the control ends of the first to i-th multiple-selection switch modules are all connected to the control module 2, and the multi-channel selection ends of the first to i-th multiple-selection switch modules are connected to one end of multiple filter capacitors C.

[0060] In a feasible embodiment of the present application, the filter capacitor C includes first to jth filter capacitors, wherein j=i×k, k is the number of multiple selection terminals of any multiple-select-one switch module, and k is an integer greater than 1.

[0061] In a feasible embodiment of the present application, the capacitances of the first to j-th filter capacitors are all different.

[0062] It is understandable that the technical solution provided by the present application filters different frequencies to be filtered by changing the capacitance value of the filter capacitor C in the LC filter circuit, and increasing the number of multiple-choice switch modules 1 can increase the number of accessible filter capacitors C, thereby forming multiple different LC filter circuits to filter different frequencies to be filtered. Differentiating the capacitance values ​​of multiple filter capacitors C is also to increase the diversity of the composed LC filter circuits and further improve the adaptability of the frequency-adjustable bandpass filter system.

[0063] In a feasible embodiment of the present application, a specific connection method of a frequency-adjustable bandpass filter system can be as follows: Figure 2 shown.

[0064] Reference Figure 2 In this embodiment, a frequency-adjustable bandpass filter system includes a first filter inductor L1, a second filter inductor L2, a first multiple-choice switch module U1, a second multiple-choice switch module U2, first to eighth filter capacitors and a control module 2, but the control module 2 is not in Figure 2 Shown in.

[0065] Specifically, the first multiple-select switch module U1 and the second multiple-select switch module U2 can be SP4T single-pole four-throw switches, and the first multiple-select switch module U1 and the second multiple-select switch module U2 both include nine pins, numbered 1 to 9.

[0066] Taking the first multiple-selection switch module U1 as an example, pin No. 1 of the first multiple-selection switch module U1 is a power supply pin, which is used to provide working voltage for the first multiple-selection switch module U1. Pin No. 1 of the first multiple-selection switch module U1 can be connected to an external power supply or to the power supply end of the control module 2; pins No. 2, 3, 5 and 6 of the first multiple-selection switch module U1 are multi-way selection pins, which serve as the multi-way selection end of the first multiple-selection switch module U1; pin No. 4 of the first multiple-selection switch module U1 is a single-way pin, which serves as the single-way end of the first multiple-selection switch module U1; pin No. 7 of the first multiple-selection switch module U1 is a data input pin, which serves as the control end of the first multiple-selection switch module U1 and is connected to the control module 2; pin No. 7 of the first multiple-selection switch module U1 is a timing control pin, which is connected to the control module 2.

[0067] After the control module 2 generates the control signal, the control signal is written into the first multiple-select-one switch module U1 through the No. 7 pin of the first multiple-select-one switch module U1, and the first multiple-select-one switch module U1 opens the specific multiple-way selection pin indicated by the control signal.

[0068] In a feasible embodiment of the present application, the control signal also carries an identity identifier, which is used to identify which multiple-selection switch module 1 the current control signal acts on. When the control signal is generated, it is input into all multiple-selection switch modules 1 in the system, and the multiple-selection switch module 1 reads the identity identifier in the control signal and compares the identity identifier in the control signal with its own identity identifier. If the comparison result is that the identity identifiers are consistent, it means that the current control signal acts on itself, and the specific multiple-way selection pin indicated by the control signal is turned on. If the comparison result is that the identity identifiers are inconsistent, it means that the current control signal acts on other multiple-selection switch modules 1, and no response is made to the control signal.

[0069] In a feasible embodiment of the present application, the control module 2 includes a detection unit, a processing unit and a sending unit;

[0070] The detection unit is used to detect the working frequency of the current cellular signal when the cellular signal is injected into the network, and determine the working frequency of the cellular signal as the frequency to be filtered;

[0071] The processing unit is used to generate a control signal according to the current frequency to be filtered;

[0072] The sending unit is used to send the control signal to the switch module.

[0073] In a feasible embodiment of the present application, the processing unit includes a first acquisition subunit, a second acquisition subunit, a judgment subunit, and a generation subunit;

[0074] The first acquisition subunit is used to acquire the operating frequency of the current WIFI signal; wherein the WIFI signal is a signal generated by the WIFI signal generating end;

[0075] The second acquisition subunit is used to acquire the frequency to be filtered;

[0076] The judging subunit is used to judge whether the frequency to be filtered overlaps with the working frequency of the current WIFI signal;

[0077] The generating subunit is used to generate a control signal when the frequency to be filtered overlaps with the working frequency of the current WIFI signal.

[0078] In a feasible embodiment of the present application, the processing unit further includes a blocking subunit;

[0079] The blocking subunit is used to prevent the generating subunit from generating a control signal when the frequency to be filtered does not overlap with the working frequency of the current WIFI signal.

[0080] Specifically, the control module 2 is used to control multiple multiple-choice switch modules 1. In the control module 2, the following scheme can be executed:

[0081] When the cellular signal is injected into the network, the operating frequency of the current cellular signal is detected to determine the frequency to be filtered; the frequency to be filtered is compared with the operating frequency of the current WIFI signal; it is determined whether the frequency to be filtered overlaps with the operating frequency of the current WIFI signal; when the frequency to be filtered overlaps with the operating frequency of the current WIFI signal, a control signal is generated and sent to the multiple-selection switch module 1; when the frequency to be filtered does not overlap with the operating frequency of the current WIFI signal, the generation subunit is prevented from generating a control signal.

[0082] When the control module 2 generates a control signal, the LC filter circuit corresponding to the frequency to be filtered is calculated according to the frequency to be filtered, thereby determining the capacitance value of the filter capacitor C required for this filtering, and then determining the filter capacitor C that needs to be opened for this filtering, thereby generating a control signal.

[0083] Through the technical solution provided by the embodiment of the present application, in a frequency-adjustable bandpass filtering system provided by the embodiment of the present application, the control module 2 generates a control signal according to the frequency to be filtered, and outputs the control signal to the multiple-choice switch module 1. The multiple-choice switch module 1 opens a path between the single-channel end and the multiple-channel selection end indicated by the control signal according to the instruction of the control signal, so that the filter inductor L and the filter capacitor C form an LC filter circuit between the WIFI signal generating end and the WIFI antenna to filter the frequency to be filtered. The present application can adaptively generate different control signals according to different frequencies to be filtered, so that the filter inductor L and different filter capacitors C form an LC filter circuit between the WIFI signal generating end and the WIFI antenna, and the frequency to be filtered can be effectively filtered when the frequency to be filtered changes, which can improve the adaptability of the technical solution for suppressing the coexistence interference between cellular and WIFI.

[0084] An embodiment of the present application further provides an electronic device, which includes a frequency-adjustable bandpass filter system as described in any one of the above embodiments.

[0085] The electronic device provided in the embodiment of the present application may specifically be a module capable of realizing a communication function or a terminal device including the module, etc. The terminal device may be a mobile terminal or a smart terminal. The mobile terminal may specifically be at least one of a mobile phone, a tablet computer, a laptop computer, etc.; the smart terminal may specifically be a terminal including a wireless communication module such as a smart car, a smart watch, a shared bicycle, a smart cabinet, etc.; the module may specifically be a wireless communication module, such as any one of a 2G communication module, a 3G communication module, a 4G communication module, a 5G communication module, and a NB-IOT communication module.

[0086] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0087] It should be understood that the terms used herein are only for the purpose of describing specific example embodiments and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "include", "comprise", "contain", and "have" are inclusive, and therefore specify the existence of stated features, steps, operations, elements and / or parts, but do not exclude the existence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not interpreted as necessarily requiring them to be performed in the specific order described or illustrated, unless the execution order is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0088] The above description is only a specific embodiment of the present invention, so that those skilled in the art can understand or implement the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but should conform to the widest scope consistent with the principles and novel features applied herein.

Claims

1. A frequency-adjustable bandpass filter system, characterized in that: The system includes a filter inductor, a multiple-choice switch module, a control module, and a plurality of filter capacitors; The filter inductor is connected between the WIFI signal generating end and the WIFI antenna; the single-channel end of the multiple-select-one switch module is connected between the filter inductor and the WIFI antenna, the multiple-channel selection end of the multiple-select-one switch module is respectively connected to one end of each of the filter capacitors, and the control end of the multiple-select-one switch module is connected to the control module; the other end of each of the filter capacitors is grounded; The control module is used to generate a control signal according to the frequency to be filtered, and input the control signal to the multiple-select-one switch module; wherein the frequency to be filtered is the operating frequency of the current cellular signal; The multiple-select-one switch module is used to open the path between the single-way end of the multiple-select-one switch module and the multiple-way selection end of the multiple-select-one switch module indicated by the control signal when receiving the control signal.

2. The system according to claim 1, characterized in that The filter inductor comprises a first filter inductor and a second filter inductor; One end of the first filter inductor is connected to the WIFI signal generating end, the other end of the first filter inductor is respectively connected to one end of the second filter inductor and the single-channel end of the multiple-select-one switch module, and the other end of the second filter inductor is connected to the WIFI antenna.

3. The system according to claim 1, characterized in that When the multiple-select-one switch module does not receive the control signal, the path between the single-path end of the multiple-select-one switch module and any one of the multiple-path selection ends of the multiple-select-one switch module is closed.

4. The system according to claim 2, characterized in that The multiple-choice-one switch module includes first to i-th multiple-choice-one switch modules, wherein i is an integer greater than 1; The single-way ends of the first to i-th multiple-selection switch modules are all connected between the first filter inductor and the second filter inductor, the control ends of the first to i-th multiple-selection switch modules are all connected to the control module, and the multi-way selection ends of the first to i-th multiple-selection switch modules are connected to one end of the plurality of filter capacitors.

5. The system according to claim 4, characterized in that The filter capacitors include first to jth filter capacitors, wherein j=i×k, k is the number of multiple selection terminals of any one of the multiple-select-one switch modules, and k is an integer greater than 1.

6. The system according to claim 5, characterized in that The capacitances of the first to jth filter capacitors are all different.

7. The system according to claim 1, characterized in that The control module includes a detection unit, a processing unit and a sending unit; The detection unit is used to detect the current operating frequency of the cellular signal when the cellular signal is injected into the network, and determine the operating frequency of the cellular signal as the frequency to be filtered; The processing unit is used to generate the control signal according to the current frequency to be filtered; The sending unit is used to send the control signal to the multiple-select-one switch module.

8. The system according to claim 7, characterized in that The processing unit includes a first acquisition subunit, a second acquisition subunit, a judgment subunit and a generation subunit; The first acquisition subunit is used to acquire the operating frequency of the current WIFI signal; wherein the WIFI signal is a signal generated by the WIFI signal generating end; The second acquisition subunit is used to acquire the frequency to be filtered; The judging subunit is used to judge whether the frequency to be filtered overlaps with the current working frequency of the WIFI signal; The generating subunit is used for generating the control signal when the frequency to be filtered overlaps with the current operating frequency of the WIFI signal.

9. The system according to claim 8, characterized in that The processing unit also includes a blocking subunit; The blocking subunit is used for preventing the generating subunit from generating the control signal when the frequency to be filtered does not overlap with the current operating frequency of the WIFI signal.

10. An electronic device, characterized in that: The electronic device comprises the frequency-adjustable bandpass filter system as described in any one of claims 1-9.

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