Broadband frequency hopping filter and radio frequency system

Abstract

The utility model relates to the technical field of microwave filters, and provides a wide-frequency-band frequency hopping filter and a radio frequency system, and the wide-frequency-band frequency hopping filter comprises a resonant filtering module which is used for filtering signals; the radio frequency switch group module is respectively connected with the resonant filtering module and the capacitance matrix module, the capacitance matrix module comprises at least two adjusting capacitors, and the radio frequency switch group module comprises at least two radio frequency switches; and the digital processing module is connected with the controlled end of the radio frequency switch group module. Based on the structures of the radio frequency switch group module and the capacitor matrix module, the number of adjusting capacitors connected with the resonant filtering module is adjusted through low-voltage control, the equivalent capacitance value is flexibly adjusted, the number and the capacitance value of the adjusting capacitors are set according to requirements, the change range limitation of the equivalent capacitance does not exist, and frequency hopping filtering in a wide frequency band range is realized. A plurality of adjusting capacitors in the capacitor matrix module can equally divide the power load, thereby facilitating the improvement of the power capacity and adapting to a high-power scene.

Description

TECHNICAL FIELD

[0001] The utility model relates to microwave filter technical field especially relates to a wide frequency band frequency hopping filter and radio frequency system. BACKGROUND

[0002] Frequency hopping filter is widely used in multi-passband, broadband and frequency hopping communication and radar system, and is an important component of system radio frequency front end.

[0003] However, the existing low-voltage control variable capacitance tube structure is limited by the equivalent capacitance variation range of the variable capacitance tube itself and the variable capacitance tube power capacity range, resulting in a small frequency adjustment range and only being applicable to low-power receiving or transmitting scenarios. SUMMARY

[0004] The utility model provides a wide frequency band frequency hopping filter and radio frequency system to solve the defect that the frequency hopping filter is limited in frequency range and power capacity under low-voltage control in the prior art.

[0005] The utility model provides a wide frequency band frequency hopping filter, comprising:

[0006] Resonant filter module is used for signal filtering;

[0007] Capacitance matrix module and radio frequency switch group module, radio frequency switch group module is connected with resonant filter module and capacitance matrix module respectively, capacitance matrix module includes at least two adjusting capacitances, and radio frequency switch group module includes at least two radio frequency switches;

[0008] Digital processing module is connected with the controlled end of radio frequency switch group module, and the digital processing module is used to produce low-voltage drive signal control the on-off of radio frequency switch to adjust the number of adjusting capacitance connected with resonant filter module.

[0009] According to the wide frequency band frequency hopping filter provided by the utility model, the number of radio frequency switches in radio frequency switch group module is equal to the number of adjusting capacitances in capacitance matrix module, the radio frequency switch is connected with the adjusting capacitance one by one, and each radio frequency switch is connected with resonant filter module.

[0010] The resonant filter module is at least two, and the filter frequency bands of different resonant filter modules are different.

[0011] The resonant filter module is at least two, and the filter frequency bands of different resonant filter modules are different.

[0012] The resonant filter module is at least two, and the filter frequency bands of different resonant filter modules are different.

[0013] The resonant filter module is at least two, and the filter frequency bands of different resonant filter modules are different.

[0014] The resonant filter module is at least two, and the filter frequency bands of different resonant filter modules are different.

[0015] The resonant filter module is at least two, and the filter frequency bands of different resonant filter modules are different.

[0016] The resonant filter module is at least two, and the filter frequency bands of different resonant filter modules are different.

[0017] The resonant filter module is at least two, and the filter frequency bands of different resonant filter modules are different.

[0018] The utility model provides a kind of wideband frequency hopping filter and radio frequency system, at least have beneficial effect: resonant filter module is based on frequency resonance, signal away from center resonance frequency will obviously attenuate, realize filtering function, the center resonance frequency of resonant filter module is related with equivalent resonance capacitance value. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical scheme in the utility model or the prior art, the drawings needed to be used in the following embodiment or prior art description will be simply introduced, obviously, the drawings in the following description are some embodiments of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0020] Figure 1 It is the structure schematic diagram of one of the embodiments of the wideband frequency hopping filter provided by the utility model.

[0021] Figure 2 It is the circuit diagram of resonant filter module, capacitor matrix module and radio frequency switch group module in one of the embodiments of the wideband frequency hopping filter provided by the utility model.

[0022] Figure 3 It is the three-dimensional schematic diagram of one of the embodiments of the wideband frequency hopping filter provided by the utility model.

[0023] Figure 4 It is the overhead schematic diagram of one of the embodiments of the wideband frequency hopping filter provided by the utility model.

[0024] Figure 5 It is the bottom view schematic diagram of one of the embodiments of the wideband frequency hopping filter provided by the utility model.

[0025] Figure 6 is an analog frequency response graph of one of the embodiments of the wide-band frequency hopping filter provided by the utility model.

[0026] Figure 7 is a measured frequency response graph of one of the embodiments of the wide-band frequency hopping filter provided by the utility model.

[0027] Reference signs:

[0028] 100, resonance filter module; 200, capacitor matrix module; 210, adjusting capacitor; 300, radio frequency switch group module; 310, radio frequency switch; 400, digital processing module; 410, instruction generating unit; 411, connection interface; 412, memory; 412, low-voltage power supply chip; 420, low-voltage driving unit; 421, driving isolation chip; 510, input connector; 520, output connector. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical scheme and advantages of the utility model more clear, the technical scheme in the utility model will be described clearly and completely below in combination with the drawings in the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the ordinary skilled in the art without creative labor belong to the protection scope of the utility model.

[0030] The utility model discloses a wide-band frequency hopping filter, which comprises: Figures 1-5 The utility model discloses a wide-band frequency hopping filter, which comprises:

[0031] Resonance filter module 100 is used for filtering signal;

[0032] Capacitor matrix module 200 and radio frequency switch group module 300, radio frequency switch group module 300 is connected with resonance filter module 100 and capacitor matrix module 200 respectively, capacitor matrix module 200 includes at least two adjusting capacitors 210, and radio frequency switch group module 300 includes at least two radio frequency switches 310;

[0033] Digital processing module 400 is connected with the controlled end of radio frequency switch group module 300, and the digital processing module 400 is used for generating low-voltage driving signal to control the on-off of radio frequency switch 310, so as to adjust the number of adjusting capacitors 210 connected with resonance filter module 100.

[0034] The resonant filter module 100 is based on frequency resonance, signals far from the resonant frequency are obviously attenuated, and the filtering function is realized, and the resonant frequency of the resonant filter module 100 is related to the equivalent resonant capacitance value. The low-voltage control signal generated by the digital processing module 400 controls the on-off of the radio frequency switch 310 in the radio frequency switch group module 300, when the radio frequency switch 310 is turned on, the number of adjusting capacitors 210 connected with the resonant filter module 100 in the capacitance matrix module 200 is increased, when the radio frequency switch 310 is turned off, the number of adjusting capacitors 210 connected with the resonant filter module 100 in the capacitance matrix module 200 is reduced, thereby adjusting the number of adjusting capacitors 210 connected with the resonant filter module 100, adjusting the equivalent resonant capacitance value of the adjusting capacitors 210 connected with the resonant filter module 100, and changing the filtering frequency range of the resonant filter module 100, so as to achieve the effect of frequency hopping filtering.

[0035] Therefore, based on the structure of the radio frequency switch group module 300 and the capacitance matrix module 200, the number of adjusting capacitors 210 connected with the resonant filter module 100 is adjusted by low-voltage control, the equivalent capacitance value can be flexibly adjusted, the number and capacitance value of the adjusting capacitors 210 can be set according to requirements, there is no limitation on the change range of the equivalent capacitance, which is beneficial to realize frequency hopping filtering in a wide frequency range, and meanwhile, the multiple adjusting capacitors 210 in the capacitance matrix module 200 can evenly distribute the power load, which is beneficial to improve the power capacity and adapt to high-power scenes.

[0036] Based on the frequency resonance principle, signals with frequencies near the resonant frequency of the resonant filter module 100 are resonantly amplified, and signals with frequencies far from the resonant frequency are obviously attenuated, thereby realizing amplification or suppression of signals with specific frequencies and achieving the effect of filtering. The resonant frequency of the resonant filter module 100 determines the center frequency of the filtering, and therefore, by adjusting the equivalent resonant capacitance value to change the center frequency of the filtering, the function of frequency hopping filtering can be realized.

[0037] In some embodiments of the utility model, the resonant filter module 100 can include filter inductors, filter capacitors, resistors and the like, the filter inductors and the filter capacitors form an LC filter circuit as an LC resonator for filtering, the adjusting capacitors 210 in the capacitance matrix module 200 are connected with the LC filter circuit to change the equivalent resonant capacitance value and further change the resonant frequency. In some embodiments, the resonant filter module 100 can also include a resonant inductor magnetic ring, the resonant inductor magnetic ring is connected with the adjusting capacitors 210 in the capacitance matrix module 200 to form an LC filter circuit. In some embodiments of the utility model, the resonant filter module 100 can also be an embodiment including a crystal resonator, a distributed resonator and the like.

[0038] In some embodiments of the utility model, radio frequency switch 310 can be the implementation of device such as field effect tube, triode, also can be the implementation of radio frequency switch 310 chip.

[0039] Reference Figure 1 And Figure 2 In some embodiments of the utility model wide frequency band frequency hopping filter, radio frequency switch group module 300 includes the number of radio frequency switch 310 and the number of adjusting capacitor 210 included in capacitor matrix module 200 is equal, radio frequency switch 310 and adjusting capacitor 210 are connected one by one, each radio frequency switch 310 is connected with resonant filter module 100.

[0040] Radio frequency switch 310 and adjusting capacitor 210 correspond to each other, and each radio frequency switch 310 is turned on or turned off, and the corresponding adjusting capacitor 210 is connected or disconnected with resonant filter module 100, which can accurately control the number of adjusting capacitors 210 connected with resonant filter module 100, and is beneficial to improve the accuracy of frequency hopping control.

[0041] In some embodiments of the utility model, it can also be a radio frequency switch 310 and two or more adjusting capacitors 210 connection mode, and the number of adjusting capacitors 210 connected by each radio frequency switch 310 can not be equal.

[0042] Reference Figures 2 to 4 In some embodiments of the utility model wide frequency band frequency hopping filter, resonant filter module 100 is at least two, and the filter frequency band of different resonant filter modules 100 is different.

[0043] In order to further widen the frequency range and make frequency hopping filter more flexible, at least two resonant filter modules 100 are provided, and the filter frequency band of resonant filter module 100 is different, which can be completely overlapped or partially overlapped. In this way, the frequency range of frequency hopping filter is wider, and more resonant filter modules 100 can make the adjustment of filter center frequency more flexible.

[0044] In some embodiments of the utility model, the number of resonant filter modules 100 is two.

[0045] Reference Figures 1 to 4 In some embodiments of the utility model wide frequency band frequency hopping filter, capacitor matrix module 200 and radio frequency switch group module 300 are connected one by one with resonant filter module 100, radio frequency switch group module 300 is connected with corresponding capacitor matrix module 200 and resonant filter module 100 respectively, and the controlled end of each radio frequency switch group module 300 is connected with digital processing module 400.

[0046] For each resonant filter module 100 , a corresponding RF switch group module 300 and a resonant filter module 100 are provided, so as to adjust the resonant frequency of each resonant filter module 100 , which is conducive to more flexible and controllable frequency hopping adjustment.

[0047] In some embodiments of the present invention, the capacitance values ​​of the adjustment capacitors 210 in the capacitor matrix module 200 are equal, which facilitates adjustment of the equivalent resonant capacitance. In some embodiments of the present invention, based on the equal capacitance values ​​of the adjustment capacitors 210 in the capacitor matrix module 200, different capacitor matrix modules 200 can set the capacitance values ​​of the adjustment capacitors 210 included in them according to the resonant frequency of the corresponding resonant filter module 100.

[0048] In some embodiments of the present invention, when there are multiple resonant filter modules 100 responsible for different filtering frequency bands, a selection module can be provided. The selection module is used to select the resonant filter module 100 for filtering the signal. The selection module may include an enabling circuit, which enables the target resonant filter module 100 to operate. The selection module may also include a switching circuit composed of a switching tube, which selects the resonant filter module 100 for filtering by controlling the path of signal transmission.

[0049] refer to Figure 1 、 Figure 4 and Figure 5 In some embodiments of a wide-band frequency hopping filter of the present invention, the digital processing module 400 includes an instruction generating unit 410 and a low-voltage driving unit 420, the instruction generating unit 410 is connected to the input end of the low-voltage driving unit 420, and the output end of the low-voltage driving unit 420 is connected to the controlled end of the RF switch group module 300.

[0050] The instruction generation unit 410 generates a control instruction and transmits it to the low-voltage drive unit 420. In response to the control instruction, the low-voltage drive unit 420 generates a low-voltage drive signal to the RF switch group module 300, turning the corresponding RF switch 310 on or off, thereby controlling the number of adjustment capacitors 210 connected to the resonant filter module 100. In this way, the low-voltage drive unit 420 controls the RF switch group module 300 based on low-voltage drive. Low voltage has lower requirements for circuit insulation, facilitating practical applications and reducing implementation costs.

[0051] refer to Figure 1 and Figure 5In some embodiments of the wide-band frequency hopping filter, the instruction generating unit 410 comprises a connection interface 411 and a memory 412, the connection interface 411 is provided with a low-voltage power supply end and an address code end, the low-voltage power supply end is connected with the power supply end of the memory 412 and the power supply end of the low-voltage driving unit 420 respectively, the address code end is connected with the memory 412, and the output end of the memory 412 is connected with the input end of the low-voltage driving unit 420.

[0052] The connection interface 411 is used for being connected with an external control processing device, equipment or module and the like, so as to transmit the control signals such as address codes to the memory 412 through the address code end, the memory 412 stores control instructions for realizing frequency hopping control, and the memory 412 outputs corresponding control instructions to the low-voltage driving unit 420 under the action of the control signals such as address codes. Meanwhile, the connection interface 411 is also provided with a low-voltage power supply end, so as to obtain power supply signals for supplying power to the memory 412 and the low-voltage driving unit 420. In this way, the memory 412 outputs the control instructions stored therein through the control signals such as address codes, and then the low-voltage driving unit 420 is driven to drive the corresponding radio frequency switch 310 of the radio frequency switch group module 300 to call the control instructions stored in the memory 412, so that the control is simplified, and the frequency hopping filter is more convenient to control.

[0053] In some embodiments of the utility model, the connection interface 411 can be a wire interface, an I2C interface, a USB interface and the like. In some embodiments of the utility model, the instruction generating unit 410 can also be an embodiment comprising a single-chip microcomputer and the like, which generates control instructions by itself.

[0054] In some embodiments of the utility model, a low-voltage power supply chip 413 can also be arranged to be connected with the memory 412 and the low-voltage driving unit 420, so as to provide more stable low-voltage power supply.

[0055] Reference Figure 1 And Figure 4 In some embodiments of the wide-band frequency hopping filter, the low-voltage driving unit 420 comprises a driving isolation chip 421 corresponding to the radio frequency switch group module 300 one by one, the input end of the driving isolation chip 421 is connected with the instruction generating unit 410, and the output end of the driving isolation chip 421 is connected with the controlled end of the corresponding radio frequency switch group module 300.

[0056] The low-voltage driving unit 420 comprises a driving isolation chip 421 corresponding to the radio frequency switch group module 300, the driving isolation chip 421 can isolate the input and the output, that is, the instruction generating unit 410 is isolated from the radio frequency switch group module 300, so as to guarantee the stability of the resonant filtering module 100 in the resonant filtering process with the radio frequency switch group module 300 and the capacitance matrix module 200, and the control of the instruction generating unit 410 is more stable, the input side and the output side are prevented from affecting each other, and the reliability is improved.

[0057] In some embodiments of the utility model, the driving isolation chip 421 can be integrated with the implementation of the photoelectric coupling circuit.

[0058] Reference Figures 1 to 3 In some embodiments of the utility model of a wide frequency band frequency hopping filter, input connector 510 and output connector 520 are further included, the input end of the resonant filtering module 100 is connected with the input connector 510, and the output end of the resonant filtering module 100 is connected with the output connector 520.

[0059] By being provided with the input connector 510 and the output connector 520, it is convenient to be connected with external devices to obtain radio frequency signals for frequency hopping filtering, and it is convenient to use.

[0060] Reference Figure 6 , Figure 6 The utility model provides a wide frequency band frequency hopping filter's simulation frequency response curve, from the drawing, the response of each frequency signal under different resonant frequencies, that is, filter center frequency is realized, and the function of frequency hopping filtering is realized.

[0061] Reference Figure 7 , Figure 7 The utility model provides a wide frequency band frequency hopping filter's measured frequency response graph, and the filtering effect is excellent from the drawing.

[0062] A radio frequency system provided by the utility model is described below, and the radio frequency system described below can be correspondingly referred to the wide frequency band frequency hopping filter described above.

[0063] The utility model further provides a radio frequency system, including the wide frequency band frequency hopping filter, further including control processing module and radio frequency transceiver module, control processing module is connected with digital processing module 400 and radio frequency transceiver module respectively, resonant filtering module 100 is connected with radio frequency transceiver module.

[0064] The radio frequency transceiver module receives or transmits radio frequency signals, and under the control of the control processing module, the radio frequency signals are transmitted to the resonant filter module 100 for processing. Based on frequency resonance, signals away from the center resonant frequency will be significantly attenuated, realizing the filtering function. The center resonant frequency of the resonant filter module 100 is related to the equivalent resonant capacitance value. Under the control of the control processing module, the digital processing module 400 generates a low-voltage control signal to control the on-off of the radio frequency switch 310 in the radio frequency switch group module 300. When the radio frequency switch 310 is turned on, the number of adjustment capacitors 210 connected to the resonant filter module 100 in the capacitance matrix module 200 is increased, and when the radio frequency switch 310 is turned off, the number of adjustment capacitors 210 connected to the resonant filter module 100 in the capacitance matrix module 200 is reduced. In this way, the number of adjustment capacitors 210 connected to the resonant filter module 100 is adjusted, and the adjustment of the adjustment capacitors 210 connected to the resonant filter module 100 adjusts the equivalent resonant capacitance value, thereby changing the filtering frequency range of the resonant filter module 100, achieving the effect of frequency hopping filtering. The signals processed by the resonant filter module 100 are controlled by the control processing module, and then processed by the radio frequency transceiver module for transmission or reception.

[0065] In this way, based on the structure of the radio frequency switch group module 300 and the capacitance matrix module 200, the number of adjustment capacitors 210 connected to the resonant filter module 100 is adjusted by low-voltage control, which can flexibly adjust the equivalent capacitance value. The number and capacitance value of the adjustment capacitors 210 are set according to the requirements, there is no limitation on the range of equivalent capacitance change, which is conducive to realizing wide frequency range frequency hopping filtering, and the multiple adjustment capacitors 210 in the capacitance matrix module 200 can evenly distribute the power load, which is conducive to improving the power capacity and adapting to high-power scenarios.

[0066] In some embodiments of the present application, the control processing module can include single-chip microcomputers, embedded chips, and other devices with control processing functions. The radio frequency transceiver module can include antennas, amplification circuits, mixers, and other devices and circuits.

[0067] In the description of the present application, it should be understood that the terms "first" and "second" are for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features limited by "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0068] In the description of the present specification, the description referring to the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, the person skilled in the art can combine and combine the different embodiments or examples described in the present specification and the features of the different embodiments or examples, without contradiction.

[0069] All actions of obtaining signals, information or data in the present application are carried out in compliance with the corresponding data protection regulations and policies of the place, and with the authorization given by the owner of the corresponding device.

[0070] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A wide-band frequency hopping filter, characterized in that: include: A resonance filter module (100) for filtering signals; A capacitor matrix module (200) and a radio frequency switch group module (300), wherein the radio frequency switch group module (300) is connected to the resonant filter module (100) and the capacitor matrix module (200), respectively; the capacitor matrix module (200) includes at least two adjustment capacitors (210); and the radio frequency switch group module (300) includes at least two radio frequency switches (310); A digital processing module (400) is connected to the controlled end of the radio frequency switch group module (300), and the digital processing module (400) is used to generate a low-voltage drive signal to control the on and off of the radio frequency switch (310) to adjust the number of the regulating capacitors (210) connected to the resonant filter module (100).

2. The wide-band frequency hopping filter according to claim 1, wherein: The number of the radio frequency switches (310) included in the radio frequency switch group module (300) is equal to the number of the regulating capacitors (210) included in the capacitor matrix module (200); the radio frequency switches (310) are connected to the regulating capacitors (210) in a one-to-one correspondence; and each radio frequency switch (310) is connected to the resonant filter module (100).

3. A wide-band frequency hopping filter according to claim 1 or 2, characterized in that: There are at least two resonant filter modules (100), and different resonant filter modules (100) have different filtering frequency bands.

4. The wide-band frequency hopping filter according to claim 3, characterized in that: The capacitor matrix module (200) and the radio frequency switch group module (300) are in one-to-one correspondence with the resonant filter module (100); the radio frequency switch group module (300) is respectively connected to the corresponding capacitor matrix module (200) and the resonant filter module (100); and the controlled end of each radio frequency switch group module (300) is connected to the digital processing module (400).

5. The wide-band frequency hopping filter according to claim 1, wherein: The digital processing module (400) comprises an instruction generating unit (410) and a low-voltage driving unit (420), wherein the instruction generating unit (410) is connected to an input end of the low-voltage driving unit (420), and an output end of the low-voltage driving unit (420) is connected to a controlled end of the radio frequency switch group module (300).

6. The wide-band frequency hopping filter according to claim 5, characterized in that: The instruction generating unit (410) includes a connection interface (411) and a memory (412). The connection interface (411) is provided with a low-voltage power supply terminal pin and an address code terminal pin. The low-voltage power supply terminal pin is respectively connected to the power supply terminal of the memory (412) and the power supply terminal of the low-voltage driving unit (420). The address code terminal pin is connected to the memory (412). The output terminal of the memory (412) is connected to the input terminal of the low-voltage driving unit (420).

7. The wide-band frequency hopping filter according to claim 5, characterized in that: The low-voltage drive unit (420) comprises a drive isolation chip (421) corresponding one-to-one to the radio frequency switch group module (300), an input end of the drive isolation chip (421) being connected to the instruction generating unit (410), and an output end of the drive isolation chip (421) being connected to a controlled end of the corresponding radio frequency switch group module (300).

8. The wide-band frequency hopping filter according to claim 1, characterized in that: The capacitance values ​​of the adjustment capacitors (210) in the capacitor matrix module (200) are equal.

9. The wide-band frequency hopping filter according to claim 1, characterized in that: It also includes an input connector (510) and an output connector (520), wherein the input end of the resonance filter module (100) is connected to the input connector (510), and the output end of the resonance filter module (100) is connected to the output connector (520).

10. A radio frequency system, characterized in that: The invention comprises a wide-band frequency hopping filter according to any one of claims 1 to 9, and further comprises a control processing module and a radio frequency transceiver module, wherein the control processing module is connected to the digital processing module (400) and the radio frequency transceiver module respectively, and the resonant filtering module (100) is connected to the radio frequency transceiver module.

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