CN113437458B

CN113437458B - Filter for realizing frequency modulation by synchronous belt transmission structure

Info

Publication number: CN113437458B
Application number: CN202110489992.9A
Authority: CN
Inventors: 刘明星; 朱晖
Original assignee: Wuhan Fingu Electronic Technology Co Ltd
Current assignee: Wuhan Fingu Electronic Technology Co Ltd
Priority date: 2021-05-06
Filing date: 2021-05-06
Publication date: 2022-08-09
Anticipated expiration: 2041-05-06
Also published as: CN113437458A

Abstract

The invention provides a filter for realizing frequency modulation by a synchronous belt transmission structure, which comprises a cavity, a tuning mechanism, a driving mechanism and a cover plate, wherein a plurality of resonant cavities are arranged in the cavity, the tuning mechanism comprises a synchronous belt and a plurality of first adjusting rods, the lower parts of the first adjusting rods are inserted into the resonant cavities, the upper parts of the first adjusting rods penetrate through the cover plate and are in threaded connection with the cover plate, the inner surface of the synchronous belt is sleeved on each first adjusting rod, the inner surface of the synchronous belt is provided with a closed-loop tooth trace, the inner surface of the synchronous belt is in meshing transmission connection with the first adjusting rods, and the driving mechanism is connected with the synchronous belt and is used for driving the synchronous belt to move so as to enable the first adjusting rods to be inserted into the corresponding resonant cavities and adjust the insertion depth. According to the invention, the synchronous belt drives the first adjusting rod to move, and the depth of the first adjusting rod inserted into the resonant cavity is adjusted, so that the purpose of tuning the frequency by adjusting the depth of the first adjusting rod inserted into the resonant cavity is realized, the operation is simple, and good insertion loss performance can be kept in a wide adjustable range.

Description

Filter for realizing frequency modulation by synchronous belt transmission structure

Technical Field

The invention belongs to the technical field of communication, and particularly relates to a filter for realizing frequency modulation by a synchronous belt transmission structure.

Background

The frequency selective filter is widely applied as a frequency selective device in the communication field, can filter various power supplies, signals and the like, ensures the stability and reliability of circuit operation, and is an important component in the electronic communication field.

In recent years, development of communication systems has led to wide application requirements of tunable filters in microwave frequency band, and most tunable filters are implemented by adding a tuning structure on the basis of a waveguide filter. The traditional tuning structure is a frequency modulation screw rod, and the capacitance coupling value between a cover plate and a resonant cavity is changed by adjusting the length of the screw rod extending into the cavity so as to achieve the purpose of adjusting the frequency; however, the conventional tuning structure has poor sensitivity, requires a large screw length range, has a limited frequency adjusting range, and requires frequent replacement of screws with different lengths for adjustment of different frequency ranges, which is inconvenient to operate.

Disclosure of Invention

The invention aims to solve the problems that the frequency modulation range of the conventional tunable filter adopting a frequency modulation screw is limited and the operation is inconvenient.

In order to achieve the purpose, the invention adopts the following technical scheme:

the utility model provides a hold-in range transmission structure realizes frequency modulated wave filter, includes cavity, tuning mechanism, actuating mechanism and covers the apron of locating on the cavity, be equipped with a plurality of resonant cavities in the cavity, tuning mechanism includes hold-in range and a plurality of first regulation pole, each in the resonant cavity is inserted to first regulation pole lower part, be equipped with a plurality of through-holes on the apron, the through-hole is run through on the upper portion of first regulation pole, and with the through-hole threaded connection of apron, hold-in range internal surface cup joints on each first regulation pole, the hold-in range internal surface has the tooth trace of closed loop, and the hold-in range internal surface is connected with the meshing transmission between each first regulation pole, actuating mechanism with the hold-in range is connected for drive hold-in range motion is so that first regulation pole inserts and corresponds in the resonant cavity to adjust the depth of insertion.

Further, first regulation pole includes first insulation connecting rod, first conductor post and gear shaft section of thick bamboo, first conductor post upper end fixed connection is in first insulation connecting rod's bottom, and first conductor post lower extreme inserts the resonant cavity, gear shaft section of thick bamboo is fixed to be cup jointed on first insulation connecting rod, gear shaft section of thick bamboo and the tooth trace meshing transmission of hold-in range internal surface, first insulation connecting rod upper end runs through the apron, and with apron threaded connection.

Furthermore, the tuning mechanism further comprises a plurality of second adjusting rods used for tensioning the synchronous belts, the second adjusting rods are arranged between two adjacent first adjusting rods in the transmission direction of the synchronous belts, and the bottoms of the second adjusting rods are fixedly inserted into the corresponding resonant cavities.

Further, the second is adjusted the pole and is connected with the surface cooperation of hold-in range, the second is adjusted the pole and is included second insulation connecting rod, second conductor post and spacing sleeve, second conductor post upper end fixed connection is in the bottom of second insulation connecting rod, and second conductor post lower extreme inserts in the resonant cavity, spacing sleeve cup joints on second insulation connecting rod, spacing sleeve surface with the surface cooperation of hold-in range is connected.

Further, the second is adjusted the pole and is connected with the internal surface fit of hold-in range, the second is adjusted the pole and is included second insulation connecting rod, second conductor post and spacing sleeve, second conductor post upper end fixed connection is in the bottom of second insulation connecting rod, and second conductor post lower extreme inserts in the resonant cavity, spacing sleeve cup joints on second insulation connecting rod, spacing sleeve surface have with hold-in range internal surface matched with tooth trace, spacing sleeve surface is connected with the internal surface mesh transmission of hold-in range.

Furthermore, the upper end and the lower end of the limiting sleeve are both provided with limiting rings, and the outer diameter of each limiting ring is larger than that of the limiting sleeve.

Further, actuating mechanism includes motor and drive shaft, be equipped with on the drive shaft with hold-in range internal surface matched with tooth trace, the drive shaft is connected with hold-in range internal surface meshing transmission.

Furthermore, the filter with the frequency modulation realized by the synchronous belt transmission structure further comprises a bottom plate, the bottom plate is detachably connected with the bottom of the cavity through a screw, and the driving mechanism is installed on the bottom plate.

Compared with the prior art, the invention has the beneficial effects that:

the filter for realizing frequency modulation by the synchronous belt transmission structure provided by the invention drives the plurality of first adjusting rods to move through the synchronous belt, so that the first adjusting rods are inserted into the resonant cavity, the insertion depths are adjusted, the insertion depths of the first adjusting rods are the same, the purpose of tuning the frequency by adjusting the insertion depths of the first adjusting rods into the resonant cavity is realized, the operation is simple, and good insertion loss performance can be kept in a wide adjustable range.

The present invention will be described in further detail below with reference to the accompanying drawings.

Drawings

FIG. 1 is a schematic structural diagram of a filter for realizing frequency modulation by a synchronous belt transmission structure according to the present invention;

FIG. 2 is an exploded view of a filter for implementing frequency modulation in a synchronous belt drive configuration of the present invention;

FIG. 3 is a plan view of the inside of the cavity of the filter for realizing frequency modulation by the synchronous belt transmission structure of the invention;

FIG. 4 is a cross-sectional view taken along line A-A of FIG. 3;

FIG. 5 is a schematic view of a first adjustment lever according to the present invention;

fig. 6 is a schematic structural view of a second adjustment lever according to the present invention.

Description of reference numerals: 1. a cover plate; 2. a cavity; 3. a base plate; 4. a motor; 5. a drive shaft; 6. a synchronous belt; 7. a first adjusting lever; 8. a second adjusting lever; 9. a resonant cavity; 10. a groove; 11. a through hole; 12. a first insulating connecting rod; 13. a gear shaft cylinder; 14. a first conductor pillar; 15. a second insulated connecting rod; 16. a limiting ring; 17. a limiting sleeve; 18. a second conductor pillar.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.

The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature; in the description of the present invention, the meaning of "plurality" or "a plurality" is two or more unless otherwise specified.

As shown in fig. 1, 2, 3 and 4, the present embodiment provides a filter with a synchronous belt transmission structure for realizing frequency modulation, which includes a cavity 2, a tuning mechanism, a driving mechanism and a cover plate 1 covering the cavity 2, wherein the cavity 2 is internally provided with a plurality of resonant cavities 9, the tuning mechanism includes a synchronous belt 6 and a plurality of first adjusting rods 7, the lower portions of the first adjusting rods 7 are inserted into the resonant cavities 9, the cover plate 1 is provided with a plurality of through holes 11, the upper portions of the first adjusting rods 7 penetrate through the through holes 11 and are in threaded connection with the through holes 11 of the cover plate 1, the inner surface of the synchronous belt 6 is sleeved on each first adjusting rod 7, the inner surface of the synchronous belt 6 has a closed-loop tooth mark, the inner surface of the synchronous belt 6 is in meshing transmission connection with each first adjusting rod 7, the driving mechanism is connected with the synchronous belt 6 and is used for driving the synchronous belt 6 to move so as to enable the first adjusting rods 7 to be inserted into the corresponding resonant cavities 9, and adjusting the insertion depth. In the embodiment, the driving mechanism drives the synchronous belt 6 to move, so as to drive each first adjusting rod 7 in meshing transmission with the synchronous belt 6 to synchronously rotate, as each first adjusting rod 7 is in threaded connection with the corresponding through hole 11 on the cover plate 1, the first adjusting rod 7 can move up and down in the rotating process, so as to adjust the depth of the first adjusting rod 7 inserted into the resonant cavity 9, and meanwhile, the synchronous belt 6 drives each first adjusting rod 7 to synchronously rotate, so that the depth of each first adjusting rod 7 inserted into the resonant cavity 9 is the same, so as to adjust the center frequency of the filter by adjusting the depth of the first adjusting rod 7 inserted into the resonant cavity 9, i.e. the deeper the depth of the first adjusting rod 7 inserted into the resonant cavity 9 is, the lower the center frequency of the filter is, the shallower the depth of the first adjusting rod 7 inserted into the resonant cavity 9 is, and the higher the center frequency of the filter is; and the setting of the through-hole 11 on the apron 1 still can carry on spacingly to the upper end of first regulation pole 7, avoids first regulation pole 7 to rock and influence the frequency modulation precision in the adjustment process.

In a specific embodiment, as shown in fig. 5, the first adjusting lever 7 comprises a first insulating connecting rod 12, a first conductor column 14 and a gear shaft barrel 13, wherein the first insulating connecting rod 12 is a connecting member made of insulating material, such as a plastic screw, the outer surface of the first insulating connecting rod 12 and the inner surface of the through hole 11 of the cover plate 1 are provided with mutually matching threads (not labeled in the figure), the first conductor column 14 is a cylinder made of conductor, and the diameter of the cylinder is adapted to the aperture of the resonant cavity 9; first conductor post 14 upper end fixed connection is in the bottom of first insulation connecting rod 12, and in first conductor post 14 lower extreme inserted resonant cavity 9, first conductor post 14 and the coaxial arrangement of first insulation connecting rod 12, gear shaft section of thick bamboo 13 is fixed cup joints on first insulation connecting rod 12, and can not rotate relatively between the first insulation connecting rod 12, gear shaft section of thick bamboo 13 meshes the transmission with the tooth trace of hold-in range 6 internal surface, and drive gear shaft section of thick bamboo 13 in hold-in range 6 transmission course and rotate, and then drive whole first regulation pole 7 and rotate, realizes the regulation to the first conductor post 14 insertion resonant cavity 9 degree of depth. Preferably, the depth of the gear shaft cylinder 13 is greater than the designed adjusting depth of the first conductor column 14 inserted into the resonant cavity 9, so that the frequency modulation range of the filter is ensured.

The implementation mode of optimizing, tuning still includes that a plurality of is used for tensioning hold-in range 6 second to adjust pole 8, second is adjusted pole 8 and is set up between two adjacent first regulation poles 7 along hold-in range 6 direction of transmission, the bottom fixed insertion of second regulation pole 8 is in the resonant cavity 9 that corresponds, adjusts the hold-in range between two adjacent first regulation poles 7 of pole tensioning through the second to make the hold-in range more sensitive to the transmission of first regulation pole 7 in the motion process, and then can improve the regulation precision of first regulation pole 7 depth of insertion, guaranteed tuning mechanism's tuning sensitivity. Furthermore, a through hole 11 is also formed in the cover plate 1 corresponding to the upper end of the second adjusting rod 8, and the upper end of the second adjusting rod 8 penetrates through the through hole 11, so that the upper end of the second adjusting rod 8 is limited.

For an implementation manner of mounting the second adjusting rod 8, the second adjusting rod 8 is connected to the outer surface of the synchronous belt 6 in a matching manner, specifically, as shown in fig. 6, the second adjusting rod 8 includes a second insulating connecting rod 15, a second conductor column 18 and a limiting sleeve 17, similarly, the second insulating connecting rod 15 is a connecting piece made of an insulating material, the second conductor column 18 is a cylinder made of a conductor, the diameter of the cylinder is adapted to the aperture of the resonant cavity 9, the upper end of the second conductor column 18 is fixedly connected to the bottom of the second insulating connecting rod 15, the lower end of the second conductor column 18 is inserted into the resonant cavity 9, the second conductor column 18 and the second insulating connecting rod 15 are coaxially arranged, the limiting sleeve 17 is sleeved on the second insulating connecting rod 15, and the outer surface of the limiting sleeve 17 is connected to the outer surface of the synchronous belt 6 in a matching manner; when the second adjusting rod 8 is installed in the installation mode, the second adjusting rod 8 is installed in a staggered mode towards the inner side of the synchronous belt 6 relative to the two adjacent first adjusting rods 7, so that the installation of all components of the tuning mechanism in the cavity 2 is more compact, and the size of the filter can be further reduced.

Another kind of implementation of 8 installations are adjusted to the second, the second is adjusted pole 8 and is connected with the 6 interior surface fit of hold-in range, and is concrete, the second is adjusted pole 8 and is included second insulation connecting rod 15, second conductor post 18 and

limit sleeve

17, 18 upper end fixed connection in the bottom of second insulation connecting rod 15 of second conductor post, and 18 lower extremes of second conductor post insert in the resonant cavity 9, limit sleeve 17 cup joints on second insulation connecting rod 15, the 17 surface of limit sleeve has the tooth trace with 6 interior surface fit of hold-in range, the 17 surface of limit sleeve is connected with the 6 interior surface mesh transmission of hold-in range, and the second is adjusted pole 8 and is adjusted 7 to the 6 outside dislocation set of hold-in range for its two adjacent first regulation poles at this moment.

Optimally, the upper end and the lower end of the limiting sleeve 17 of the second adjusting rod 8 can be provided with the limiting ring 16, the outer diameter of the limiting ring 16 is larger than the outer diameter of the limiting sleeve 17, the synchronous belt 6 connected with the second adjusting rod 8 is limited through the limiting ring 16, and the influence on the frequency modulation precision caused by the fact that the synchronous belt 6 moves up and down in the transmission process is avoided.

In this embodiment, actuating mechanism includes motor 4 and drive shaft 5, be equipped with on the drive shaft 5 with 6 internal surface matched with tooth marks of hold-in range, make

drive shaft

5 and 6 internal surface meshing transmissions of hold-in range, control drive shaft 5 through motor 4 and rotate, and then drive the motion of hold-in range 6, drive shaft 5 rotation rate control hold-in range 6 rate of motion, and then the first rotation amount of adjusting pole 7 of control realizes the regulation to the first regulation pole 7 and inserts the resonant cavity 9 degree of depth.

In this embodiment, the filter further includes a bottom plate 3, the bottom plate 3 is detachably connected to the bottom of the cavity 2 through a screw, the driving mechanism is installed on the bottom plate 3, specifically, a groove 10 for placing the driving mechanism is formed in one side of the cavity 2, and after the driving mechanism is fixed on the bottom plate 3, a driving shaft 5 of the driving mechanism penetrates through the groove 10 and extends into the cavity 2 so as to be connected to the synchronous belt 6 in a matching manner.

In summary, the filter for realizing frequency modulation by the synchronous belt transmission structure provided by the invention drives the plurality of first adjusting rods to move through the synchronous belt, so that the first adjusting rods are inserted into the resonant cavity, and the insertion depths are adjusted, so that the insertion depths of the first adjusting rods are the same, the purpose of tuning the frequency by adjusting the insertion depths of the first adjusting rods into the resonant cavity is realized, the operation is simple, and good insertion loss performance can be kept in a wide adjustable range.

The above examples are merely illustrative of the present invention and should not be construed as limiting the scope of the invention, which is intended to be covered by the claims and any design similar or equivalent to the scope of the invention.

Claims

1. A filter with a synchronous belt transmission structure for realizing frequency modulation is characterized by comprising a cavity, a tuning mechanism, a driving mechanism and a cover plate, wherein the cover plate is covered on the cavity, a plurality of resonant cavities are arranged in the cavity, the tuning mechanism comprises a synchronous belt and a plurality of first adjusting rods, the lower parts of the first adjusting rods are inserted into the resonant cavities, a plurality of through holes are formed in the cover plate, the upper parts of the first adjusting rods penetrate through the through holes and are in threaded connection with the through holes of the cover plate, the inner surface of the synchronous belt is sleeved on each first adjusting rod, a closed-loop tooth trace is formed in the inner surface of the synchronous belt, the inner surface of the synchronous belt is in meshing transmission connection with each first adjusting rod, and the driving mechanism is connected with the synchronous belt and is used for driving the synchronous belt to move so that the first adjusting rods are inserted into the corresponding resonant cavities and adjusting the insertion depth;

the first adjusting rod comprises a first insulation connecting rod, a first conductor column and a gear shaft cylinder, the upper end of the first conductor column is fixedly connected to the bottom of the first insulation connecting rod, the lower end of the first conductor column is inserted into the resonant cavity, the gear shaft cylinder is fixedly sleeved on the first insulation connecting rod, the gear shaft cylinder is in meshing transmission with tooth marks on the inner surface of the synchronous belt, and the upper end of the first insulation connecting rod penetrates through the cover plate and is in threaded connection with the cover plate.

2. The filter for realizing frequency modulation by using the synchronous belt transmission structure as claimed in claim 1, wherein the tuning mechanism further comprises a plurality of second adjusting rods for tensioning the synchronous belt, the second adjusting rods are disposed between two adjacent first adjusting rods along the synchronous belt transmission direction, and the bottoms of the second adjusting rods are fixedly inserted into the corresponding resonant cavities.

3. The filter for realizing frequency modulation by using the synchronous belt transmission structure as claimed in claim 2, wherein the second adjusting rod is connected with the outer surface of the synchronous belt in a matching manner, the second adjusting rod comprises a second insulating connecting rod, a second conductor column and a limiting sleeve, the upper end of the second conductor column is fixedly connected to the bottom of the second insulating connecting rod, the lower end of the second conductor column is inserted into the resonant cavity, the limiting sleeve is sleeved on the second insulating connecting rod, and the outer surface of the limiting sleeve is connected with the outer surface of the synchronous belt in a matching manner.

4. The filter for realizing frequency modulation by using the synchronous belt transmission structure as claimed in claim 2, wherein the second adjusting rod is in fit connection with the inner surface of the synchronous belt, the second adjusting rod comprises a second insulating connecting rod, a second conductor post and a limiting sleeve, the upper end of the second conductor post is fixedly connected to the bottom of the second insulating connecting rod, the lower end of the second conductor post is inserted into the resonant cavity, the limiting sleeve is sleeved on the second insulating connecting rod, the outer surface of the limiting sleeve has tooth marks matched with the inner surface of the synchronous belt, and the outer surface of the limiting sleeve is in mesh transmission connection with the inner surface of the synchronous belt.

5. A filter for realizing frequency modulation by a synchronous belt drive structure as claimed in claim 3 or 4, wherein the upper and lower ends of the limit sleeve are provided with limit rings, and the outer diameter of the limit rings is larger than that of the limit sleeve.

6. A filter for realizing frequency modulation by a synchronous belt drive structure as claimed in claim 1, wherein said drive mechanism comprises a motor and a drive shaft, said drive shaft is provided with teeth marks matching with the inner surface of the synchronous belt, said drive shaft is engaged with the inner surface of the synchronous belt.

7. A filter for realizing frequency modulation by using a synchronous belt drive structure as claimed in claim 1, further comprising a bottom plate, wherein said bottom plate is detachably connected with the bottom of said cavity by screws, and said driving mechanism is mounted on said bottom plate.