WO2023016560A1

WO2023016560A1 - Modular structure based frequency-adjustable filter

Info

Publication number: WO2023016560A1
Application number: PCT/CN2022/112249
Authority: WO
Inventors: 蔡绍伟; 朱晖; 洪亮
Original assignee: 武汉凡谷电子技术股份有限公司
Priority date: 2021-08-13
Filing date: 2022-08-12
Publication date: 2023-02-16
Also published as: CN113851799B; CN113851799A

Abstract

Provided in the present application is a modular structure based frequency-adjustable filter. The frequency-adjustable filter comprises a filtering body and a frequency adjusting module, wherein a first frequency adjusting hole is provided on the filtering body; and the frequency adjusting module comprises a frequency adjusting cavity, a frequency adjusting mechanism, a driving mechanism, and a cover plate, the driving mechanism being in transmission connection with the frequency adjusting mechanism, the bottom of the frequency adjusting cavity being provided with a second frequency adjusting hole, the second frequency adjusting hole corresponding to the first frequency adjusting hole, and the frequency adjusting mechanism being arranged in the frequency adjusting cavity, and at least comprising a frequency adjusting rod, the frequency adjusting rod penetrating the second frequency adjusting hole to extend into the first frequency adjusting hole. According to the present invention, the processing mode is such a frequency-adjustable portion of the filter is modularly designed and is manufactured into an integrated frequency adjusting module, and the frequency adjusting module can be pre-manufactured and assembled onto different filters, has a simple operation, convenient disassembly and assembly, high universality, and excellent product consistency, and the manufacturing of the filter can be completed in a short time, such that the production efficiency is improved; moreover, the frequency adjusting rod is integrated onto the frequency adjusting module, and the frequency of the filter can be adjusted by means of the vertical movement of the frequency adjusting rod.

Description

A Tunable Frequency Filter Based on Modular Structure

technical field

The application belongs to the technical field of communication, and in particular relates to a frequency-tunable filter based on a modular structure.

Background technique

In the field of communication, filters are widely used as a frequency selection device, which can filter various power supplies and signals to ensure the stability and reliability of circuit operation, and are very important components in the field of electronic communications.

In recent years, with the development of communication systems, tunable filters in the microwave frequency band have a wide range of application requirements. Most tunable filters are realized by adding structures that can be automatically debugged on the basis of ordinary filters. The related tunable frequency filter has the following problems: (1) The design and processing process of the tunable frequency filter generally includes calculation, drawing processing, debugging and other processes. The completion process is complicated and the completion period is long, resulting in low production efficiency of the filter product (2) The frequency modulation structure of the frequency modulation filter is a frequency modulation screw, and the capacitive coupling value between the cover plate and the resonator is changed by the length of the frequency modulation screw extending into the cavity to achieve the purpose of frequency adjustment; the sensitivity of this frequency modulation structure is poor , the length range of the screw is required to be large, the frequency adjustment range is limited, and for the adjustment of different frequency ranges, it is necessary to frequently replace the screws of different lengths, which is inconvenient to operate.

Contents of the invention

The purpose of this application is to provide a tunable frequency filter based on a modular structure, so as to shorten the production cycle of the tunable frequency filter, and at the same time overcome the problems of limited frequency tuning range and inconvenient operation of the related tunable filter using the frequency tuning screw.

In order to achieve the above object, the application adopts the following technical solutions:

A frequency-tunable filter based on a modular structure, including a filter body, and a frequency-modulation module arranged on the filter body; the bottom of the filter body is provided with a first frequency-modulation hole, and the frequency-modulation module includes a frequency-modulation cavity, a frequency-modulation mechanism, The drive mechanism and the cover plate covered on the frequency modulation cavity, the drive mechanism is connected to the frequency modulation mechanism, the bottom of the frequency modulation cavity is provided with a second frequency modulation hole, and the second frequency modulation hole is connected to the first frequency modulation of the filter body Corresponding to the hole, the frequency modulation mechanism is arranged in the frequency modulation cavity, and the frequency modulation mechanism includes at least one frequency modulation rod. Move up and down inside.

Optionally, multiple frequency modulation modules are arranged on the filtering body.

Optionally, the frequency modulation mechanism includes a worm, a turbine, and a frequency modulation rod, the turbine is sleeved on the upper part of the frequency modulation rod, and the lower part of the frequency modulation rod is inserted into the first frequency modulation hole of the filter body through the second frequency modulation hole of the frequency modulation module, and The FM rod is threadedly connected to the second FM hole, the worm gear is connected to the worm, and the drive mechanism is connected to the worm to drive the worm to rotate so that the FM rod can be inserted into the first FM hole, and the insertion depth can be adjusted. .

Optionally, there are multiple second tuning holes arranged along the axis of the worm.

Optionally, each of the second frequency-tuning holes is located on both sides of the worm axis, and the second frequency-tuning holes on both sides of the worm axis are sequentially arranged alternately or symmetrically along the worm axis, and the worm has multiple thread segments, and each thread segment is connected to the There is a one-to-one correspondence with the turbines on the second tuning holes.

Optionally, the drive mechanism includes a motor and a transmission assembly, one end of the transmission assembly is connected to the drive shaft of the motor, and the other end of the transmission assembly is connected to one end of the worm.

Optionally, the transmission assembly is a gear set, and the gear set includes a driving wheel, a driven wheel and an intermediate driving wheel, the driving wheel is connected to the drive shaft of the motor, and the driven wheel is connected to one end of the worm Connected, the intermediate transmission wheel is meshed with the driving wheel and the driven wheel.

Optionally, grooves are provided on opposite side walls of the frequency modulation cavity, and the two ends of the worm are respectively placed in the grooves on the two side walls.

Optionally, the above-mentioned adjustable frequency filter based on a modular structure further includes a bottom plate, and the bottom plate is detachably connected to the bottom of the filter main body through screws.

Optionally, a manual frequency tuning screw is provided on the bottom plate corresponding to the position of the first frequency tuning hole.

Compared with related technologies, the beneficial effects of the embodiments of the present application:

(1) In the tunable frequency filter based on the modular structure provided by the embodiment of the present application, the tunable part is designed in a modular manner, and it is made into a whole FM module, which can be prefabricated and then assembled into different filters The above processing method is simple to operate, convenient to disassemble and assemble, strong versatility, and good product consistency. The production of filters can be completed in a short time, which improves production efficiency.

(2) In the adjustable frequency filter based on the modular structure provided by the embodiment of the present application, the frequency modulation rod is integrated into the frequency modulation module to realize the up and down movement of the frequency modulation rod, so that after the frequency modulation module is assembled, the frequency modulation module will Adjustment-free can be realized, the processing process of the filter is simplified, and the production cycle of the filter is further reduced.

(3) The tunable frequency filter based on the modular structure provided by the embodiment of the present application drives multiple turbines to rotate through the worm, so that the FM rod can be inserted into the first FM hole of the filter body, and the insertion depth can be adjusted so that each FM The insertion depth of the rods is the same, so as to achieve the purpose of adjusting the frequency by adjusting the depth of the tuning rod inserted into the first tuning hole, the operation is simple, and the insertion loss performance can be maintained in a wide adjustable range.

The application will be described in further detail below in conjunction with the accompanying drawings.

Description of drawings

FIG. 1 is a schematic structural diagram of a tunable frequency filter based on a modular structure in an embodiment of the present application;

Fig. 2 is an exploded view of a tunable frequency filter based on a modular structure according to an embodiment of the present application;

FIG. 3 is a schematic structural diagram of a frequency modulation module in an embodiment of the present application;

Fig. 4 is a schematic structural diagram of the frequency modulation cavity in the embodiment of the present application.

Explanation of Reference Signs: 1. Filtering body; 2. Frequency modulation module; 3. Bottom plate; 4. First frequency modulation hole; 5. Frequency modulation screw; 6. Cover plate; 7. Frequency modulation cavity; 8. Frequency modulation rod; 9. Turbine ; 10, worm; 11, motor; 12, transmission assembly; 13, the second frequency modulation hole.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the application with reference to the drawings in the embodiments of the application. Apparently, the described embodiments are only some of the embodiments of the application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of this application.

In the description of the embodiments of the present application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal" ", "Top", "Bottom", "Inner", "Outer" and other indicated orientations or positional relationships are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the application and simplifying the description, rather than indicating Or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be construed as limiting the application.

The terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of these features; in the description of this application, unless otherwise specified, the meaning of "plurality" is two or more.

As shown in Fig. 1, Fig. 2, Fig. 3 and Fig. 4, this embodiment provides a tunable frequency filter based on a modular structure, including a filter body 1, and a frequency modulation module 2 arranged on the filter body 1; The filter main body 1 is provided with a first frequency modulation hole 4, and the frequency modulation module 2 includes a frequency modulation cavity 7, a frequency modulation mechanism, a drive mechanism and a cover plate 6 covered on the frequency modulation cavity 7, and the drive mechanism and the frequency modulation mechanism transmit connection, the bottom of the frequency modulation cavity 7 is provided with a second frequency modulation hole 13, the second frequency modulation hole 13 corresponds to the first frequency modulation hole 4 of the filter body 1, the frequency modulation mechanism is arranged in the frequency modulation cavity 7, and the frequency modulation mechanism Including at least one tuning rod 8, the tuning rod 8 extends through the second tuning hole 13 into the corresponding first tuning hole 4, and is driven by a driving mechanism to move up and down in the first tuning hole 4, thereby adjusting the insertion of the tuning rod 8 The depth of the first tuning hole 4, and use this to tune the center frequency of the filter. In this embodiment, the filter is modularly designed and assembled, and the adjustable frequency part in the filter is made into an integral frequency modulation module 2, which can be prefabricated and then directly assembled into the filter main body 1 of the filter. , easy to operate, easy to disassemble, and good product consistency; at the same time, the frequency modulation lever 8 is integrated into the frequency modulation module 2, and the process of realizing the frequency modulation frequency through the up and down movement of the frequency modulation lever 8 can be debugged on the frequency modulation module 2, and the frequency modulation module 2 After being assembled on the filter, the entire frequency modulation module 2 can be tuned-free during filter debugging, thereby simplifying the processing process of the filter and further reducing the production cycle of the filter. For different filter products, the corresponding frequency modulation modules can be made in advance, and the corresponding frequency modulation modules can be directly assembled for different filter products. Therefore, the frequency modulation filter based on the modular structure provided by this embodiment The modular design of the adjustable frequency part of the filter in the filter can be applied to products of different frequency bands.

In this embodiment, the tunable frequency filter further includes a bottom plate 3, and the bottom plate 3 is detachably connected to the bottom of the filter main body 1 through screws. Preferably, a manual frequency tuning screw 5 is provided at the position corresponding to the first frequency tuning hole 4 on the base plate 3. After the frequency modulation of the frequency modulation module 2 is completed, the frequency tuning screw 5 on the bottom plate 3 can be manually adjusted to further realize the filtering The fine-tuning of the frequency modulation of the device further ensures the accuracy of frequency modulation.

In some embodiments, according to actual requirements, multiple frequency modulation modules 2 can be assembled on the filtering main body 1 . As in this embodiment, the filter body 1 is equipped with two frequency modulation modules 2, and the two frequency modulation modules 2 can control frequency modulation independently.

As an implementation, as shown in Figure 3 and Figure 4, the frequency modulation mechanism includes a worm 10, a turbine 9 and a frequency modulation rod 8, the turbine 9 is sleeved on the upper part of the frequency modulation rod 8, and the lower part of the frequency modulation rod 8 is passed through the frequency modulation The second frequency modulation hole 13 of the module 2 is inserted into the first frequency modulation hole 4 of the filter body 1, and the frequency modulation rod 8 is screwed to the second frequency modulation hole 13, the turbine 9 is connected to the worm 10 in transmission, and the drive mechanism is connected to the worm 10 connected to drive the worm 10 to rotate so that the frequency tuning rod 8 is inserted into the first frequency tuning hole 4 and to adjust the insertion depth. During this implementation process, the drive mechanism drives the worm 10 to rotate, driving the worm gear 9 that is transmission-connected to the worm 10 to rotate synchronously. Due to the threaded connection between the frequency modulation rod 8 connected to the worm gear 9 and the second frequency modulation hole 13, the rotation of the turbine 9 During the process, the frequency modulation rod 8 is driven to rotate to realize the up and down movement of the frequency modulation rod 8, and the second frequency modulation hole 13 is arranged correspondingly to the first frequency modulation hole 4 in the filter body 1, and then the depth of the frequency modulation rod 8 inserted into the first frequency modulation hole 4 can be adjusted. Purpose, at the same time, the worm 10 drives the turbines 9 to rotate synchronously, so that the depths of the insertion of the frequency modulation rods 8 into the first frequency modulation holes 4 are the same, so that the center frequency of the filter can be adjusted by adjusting the depth of the frequency modulation rods 8 inserted into the first frequency modulation holes 4 , that is, the deeper the depth of the tuning rod 8 inserted into the first tuning hole 4, the lower the center frequency of the filter, and the shallower the depth of the tuning rod 8 inserted into the first tuning hole 4, the higher the center frequency of the filter. The FM mode is easy to operate, and can maintain good insertion loss performance in a wide adjustable range. Moreover, during the adjustment process of the tuning lever 8, by controlling the depth of the second tuning hole 13, it is possible to effectively avoid shaking of the tuning lever 8 and affecting the tuning accuracy.

In some embodiments, there are multiple second tuning holes 13 arranged along the axis of the worm 10 , and the second tuning holes 13 may be distributed on the same side of the axis of the worm 10 or arranged on both sides of the axis of the worm 10 . Preferably, when the second frequency modulation holes 13 are located on both sides of the axis of the worm 10, the second frequency modulation holes 13 on both sides of the axis of the worm 10 are arranged alternately or symmetrically along the axis of the worm 10. Corresponding to this arrangement, design The worm 10 has multiple thread segments, and each thread segment corresponds to the turbines 9 on the second tuning holes 13. By arranging a plurality of turbines 9 on both sides of the worm 10, the two sides of the worm 10 during work The force direction of the turbine 9 on the worm 10 is opposite, which ensures the balance of the force in the horizontal direction during the rotation of the worm 10, thereby effectively avoiding the inclination of the frequency modulation rod 8 caused by uneven force when the turbine 9 is arranged on one side. question. And in order to ensure that when the worm 10 rotates, it can drive the frequency modulation rods 8 on both sides to move upwards or downwards synchronously. On the contrary; in some other embodiments, it is also possible to design the helical direction of each thread segment on the worm 10 to be the same, and at this time, the helical direction of the thread in the second frequency modulation hole 13 on both sides of the worm 10 is designed to be opposite; thus realizing that the worm 10 drives The frequency modulation levers 8 move synchronously, thereby achieving the purpose of adjusting the center frequency of the filter by adjusting the frequency modulation levers 8 .

Preferably, grooves are provided on the opposite side walls of the frequency modulation cavity 7, and the two ends of the worm 10 are respectively placed in the grooves on the two side walls, and the ends of the worm 10 are restricted by the grooves. position, to ensure the stability of the worm 10 during rotation, thereby improving the frequency modulation accuracy.

As an embodiment, the drive mechanism includes a motor 11 and a transmission assembly 12, one end of the transmission assembly 12 is connected to the drive shaft of the motor 11, and the other end of the transmission assembly 12 is connected to one end of the worm 10, through the motor 11 Control the movement of the transmission assembly 12, and then drive the worm 10 to rotate, control the rotation rate of the worm gear through the movement speed of the transmission assembly 12, and then control the rotation amount of the frequency modulation rod 8, and realize the adjustment of the insertion depth of the frequency modulation rod 8 into the first frequency modulation hole 4; and The arrangement of the transmission assembly 12 facilitates the connection between the motor 11 and the worm 10, making the installation positions of the motor 11 and the worm 10 controllable. Specifically, the transmission assembly 12 is a gear set, and the gear set includes a driving wheel, a driven wheel and an intermediate driving wheel, the driving wheel is connected to the drive shaft of the motor 11, and the driven wheel is connected to the worm 10 One end of the middle transmission wheel is connected with the driving wheel and the driven wheel, and the motor 11 drives the driving wheel to rotate, thereby driving the rotation of the middle transmission wheel. According to the actual situation, multiple middle transmission wheels can be provided, and each middle The transmission wheels are meshed for transmission, and the rotation of the intermediate transmission wheel further drives the rotation of the driven wheel, so that the motor 11 controls the rotation of the worm 10 .

In summary, in the tunable frequency filter based on the modular structure provided by the embodiment of the present application, the tunable part is designed in a modular manner, and it is made into a whole FM module, which can be prefabricated and then assembled into different The processing method on the filter is simple in operation, convenient in disassembly and assembly, strong in versatility, and has good product consistency. The production of the filter can be completed in a short time, which improves the production efficiency.

The above examples are only illustrations of the present application, and do not constitute a limitation to the protection scope of the present application. All designs that are the same as or similar to the present application belong to the protection scope of the present application.

Industrial Applicability

In the tunable frequency filter based on the modular structure provided in the embodiment of the present application, the tunable part is designed in a modular manner, and it is made into a whole FM module, which can be prefabricated and then assembled to different filters. The method is simple in operation, convenient in disassembly and assembly, strong in versatility, and good in product consistency, and can complete the production of filters in a short time, improving production efficiency. In the adjustable frequency filter based on the modular structure provided by this application, the frequency modulation lever is integrated into the frequency modulation module to realize the up and down movement of the frequency modulation lever, so that after the frequency modulation module is assembled, the frequency modulation module can be adjusted without adjustment when debugging the filter. The processing process of the filter is simplified, and the production cycle of the filter is further reduced. The tunable frequency filter based on the modular structure provided by this application drives multiple turbines to rotate through the worm, so that the FM rod can be inserted into the first FM hole of the filter body, and the insertion depth can be adjusted so that the insertion depth of each FM rod is the same. In this way, the purpose of tuning the frequency by adjusting the depth of the tuning rod inserted into the first tuning hole is achieved, the operation is simple, and good insertion loss performance can be maintained within a wide adjustable range.

Claims

A frequency-tunable filter based on a modular structure: including a filter body, and a frequency-modulation module arranged on the filter body; the filter body is provided with a first frequency-modulation hole, and the frequency-modulation module includes a frequency-modulation cavity, a frequency-modulation mechanism, The drive mechanism and the cover plate covered on the frequency modulation cavity, the drive mechanism is connected to the frequency modulation mechanism, the bottom of the frequency modulation cavity is provided with a second frequency modulation hole, and the second frequency modulation hole is connected to the first frequency modulation of the filter body Corresponding to the hole, the frequency modulation mechanism is arranged in the frequency modulation cavity, and the frequency modulation mechanism includes at least one frequency modulation rod. Move up and down inside.
The adjustable frequency filter based on a modular structure according to claim 1, wherein: a plurality of frequency modulation modules are arranged on the filter main body.
A frequency-tunable filter based on a modular structure as claimed in claim 1, wherein: said frequency-modulating mechanism comprises a worm, a turbine and a frequency-modulating rod, said turbine is sleeved on the upper part of the frequency-modulating rod, and the lower part of said frequency-modulating rod The second frequency modulation hole of the module is inserted into the first frequency modulation hole of the filter body, and the frequency modulation rod is screwed to the second frequency modulation hole, the worm gear is connected to the worm, and the drive mechanism is connected to the worm to drive the worm to rotate so that The frequency tuning rod is inserted into the first frequency tuning hole, and the insertion depth is adjusted.
A frequency-tunable filter based on a modular structure as claimed in claim 3, wherein: there are multiple second frequency-tuning holes arranged along the axis of the worm.
A frequency-tunable filter based on a modular structure as claimed in claim 4, wherein: each of the second frequency-tuning holes is located on both sides of the worm axis, and the second frequency-tuning holes on both sides of the worm axis are sequentially staggered along the worm axis or Arranged symmetrically, the worm has multiple thread segments, and each thread segment corresponds to the worm gears on the second tuning holes.
The adjustable frequency filter based on a modular structure as claimed in claim 1, wherein: the driving mechanism includes a motor and a transmission assembly, one end of the transmission assembly is connected to the drive shaft of the motor, and the other end of the transmission assembly is connected to the The worm is connected at one end.
A tunable frequency filter based on a modular structure as claimed in claim 6, wherein the transmission assembly is a gear set, and the gear set includes a driving wheel, a driven wheel and an intermediate driving wheel, and the driving wheel and the The drive shaft of the motor is connected, the driven wheel is connected with one end of the worm, and the intermediate transmission wheel is meshed and driven with the driving wheel and the driven wheel.
A tunable frequency filter based on a modular structure as claimed in claim 1, wherein grooves are provided on the opposite side walls of the FM cavity, and the two ends of the worm are respectively placed on the two side walls in the groove.
A tunable frequency filter based on a modular structure as claimed in claim 1, further comprising a bottom plate, said bottom plate being detachably connected to the bottom of said filtering main body through screws.
A frequency-tunable filter based on a modular structure as claimed in claim 9, wherein: a manual frequency-tuning screw is arranged on the bottom plate corresponding to the first frequency-tuning hole.