CN116565495B

CN116565495B - Cavity filter

Info

Publication number: CN116565495B
Application number: CN202310836532.8A
Authority: CN
Inventors: 金成国
Original assignee: Suzhou Huiruoen Technology Co ltd
Current assignee: Suzhou Huiruoen Technology Co ltd
Priority date: 2023-07-10
Filing date: 2023-07-10
Publication date: 2023-09-26
Anticipated expiration: 2043-07-10
Also published as: CN116565495A

Abstract

The invention relates to the technical field of filtering, in particular to a cavity filter. It comprises a base; the upper end of base sets up the apron, and inside sets up rotatable resonant cavity body, and the outside sets up the port of intercommunication resonant cavity body. The center of the resonant cavity body is penetrated with a resonant cavity cylinder along the vertical direction and is divided into annular resonant chambers by the resonant cavity cylinder; a plurality of resonant cavities which are connected end to end in sequence are arranged in the resonant chamber. Each resonant cavity is internally provided with a resonant piece, meanwhile, the outer wall of the ring of the resonant cavity is provided with a through hole which is always communicated with the ports in a one-to-one correspondence manner in the rotation process, and a coupling window is arranged between the adjacent resonant cavities; the coupling window is provided with a coupling component which is used for adjusting the size of the coupling window and is provided with a flying lever structure. The filtering path can be selected according to the requirement, and the size of the coupling window can be adjusted. The relative positions of the signal access point, the resonant piece and the coupling window are adjusted, so that the device performance is adjusted. The whole debugging method is simple to operate and high in adjustability, and can meet the filtering requirements of different users.

Description

Cavity filter

Technical Field

The invention relates to the technical field of filtering, in particular to a cavity filter.

Background

Cavity filter the cavity belongs to one of the microwave filters for frequency selection of the signal. The cavity filter can be divided into a comb-shaped coaxial filter, a dielectric filter, a waveguide filter and a spiral filter according to different states. The cavity filter is formed by integrally cutting metal, and has a firm structure.

Existing cavity filters generally include components such as cavities, cover plates, resonator tubes, tuning screws, connectors, and the like. The staff mainly adjusts the radio frequency signal index of the filter by rotating the tuning screw and adjusting the depth of the tuning screw extending into the cavity, the adjusting mode is single, the limitation on the adjustment of the coupling performance of equipment is large, and therefore the filtering requirements of different users cannot be met.

Disclosure of Invention

Aiming at the problems in the background technology, a cavity filter is provided. The filtering path can be selected according to the requirement, and the size of the coupling window can be adjusted. The relative positions of the signal access point, the resonant piece and the coupling window are adjusted, so that the device performance is adjusted. The whole debugging method is simple to operate and high in adjustability, and can meet the filtering requirements of different users.

The invention provides a cavity filter, which comprises a base; the upper end of base sets up the apron, and inside sets up rotatable resonant cavity body, and the outside sets up the port of intercommunication resonant cavity body. The center of the resonant cavity body is penetrated with a resonant cavity cylinder along the vertical direction and is divided into annular resonant chambers by the resonant cavity cylinder; a plurality of resonant cavities which are connected end to end in sequence are arranged in the resonant chamber. Each resonant cavity is internally provided with a resonant piece, meanwhile, the outer wall of the ring of the resonant cavity is provided with a through hole which is always communicated with the ports in a one-to-one correspondence manner in the rotation process, and a coupling window is arranged between the adjacent resonant cavities; the coupling window is provided with a coupling component which is used for adjusting the size of the coupling window and is provided with a flying lever structure.

Preferably, the upper end of the resonant cavity cylinder is sealed by a cover plate, the lower end of the resonant cavity cylinder is open, and an adjusting cavity for operating the coupling assembly is arranged in the resonant cavity cylinder.

Preferably, the coupling assembly comprises a partition frame; the partition frame is arranged on the coupling window, the upper end of the partition frame is provided with a window, and the lower end of the partition frame is provided with a driving piece; the two sides of the window are provided with adjusting plates with opposite positions, and the window is also provided with a clamping frame; the two groups of adjusting plates are driven by a driving piece to realize horizontal movement; the clamping frame is clamped with the two groups of adjusting plates from the upper part and jointly adjusts the size of the window with the two groups of adjusting plates.

Preferably, the driving member includes a moving block; the lower end of the partition frame is provided with an installation groove; a rotating screw rod is arranged in the mounting groove; the end part of the screw rod extends into the adjusting cavity and is connected with the knob; the lower end of the moving block is connected with a screw rod in a threaded manner, and the upper end of the moving block is connected with an adjusting plate.

Preferably, the screw rod is provided with reverse threads; the movable block is provided with two groups which are respectively in threaded fit with the two ends of the screw rod and are connected with the adjusting plates in a one-to-one correspondence manner.

Preferably, the clamping frame is of a U-shaped structure with a downward opening, and a clamping plate clamped with the adjusting plate is arranged in the clamping frame; the clamping plate is provided with a threaded rod; the upper end of the threaded rod is rotationally connected with the top of the clamping frame, and an adjusting button is arranged; the fly rod structure is arranged below the clamping plate.

Preferably, the fly-bar structure comprises a fly-bar; the clamping frame is provided with a guide through groove penetrating through the front wall and the rear wall; a sliding sleeve capable of moving up and down is arranged in the guide through groove; the flying rod is arranged in the sliding sleeve, and the end parts face the resonant cavities on two sides; a sliding rod is arranged above the sliding sleeve; the slide bar is connected with the bottom of the threaded rod in a threaded way.

Preferably, the bottom of the clamping plate is provided with a clamping groove; the upper end of the adjusting plate is provided with an alignment lug which is in sliding clamping with the clamping groove.

Preferably, the resonating member comprises a cylinder; the bottom of the column body is provided with a mounting seat; the bottom of the mounting seat is provided with a mounting screw; the mounting screw rod extends out of the resonant cavity and is matched and fixed with the nut.

The invention also provides a debugging method of the cavity filter, which comprises the following steps:

s1, selecting a required port;

s2, connecting the signal input end and the signal output end with corresponding ports respectively;

s3, operating the coupling assembly and adjusting the size of the coupling window;

s4, rotating the resonant cavity, and adjusting the relative positions of the signal access point, the resonant piece and the coupling window.

Compared with the prior art, the invention has the following beneficial technical effects:

the invention is provided with a plurality of ports communicated with the resonant cavity, so that the filtering path can be selected according to the requirement. Through coupling component, adjust the coupling window size, and then realize the regulation to the coupling effect. The relative positions of the signal inlet and outlet points, the resonant piece and the coupling window are adjusted through rotating the resonant cavity, so that the device performance is further adjusted, and an ideal filtering effect is achieved. The whole debugging method is simple to operate and high in adjustability, and can meet the filtering requirements of different users.

Drawings

FIG. 1 is a top view of one embodiment of the present invention;

FIG. 2 is a bottom view of one embodiment of the present invention;

FIG. 3 is a block diagram of FIG. 1 with the end cap removed;

FIG. 4 is a cross-sectional view of a base in one embodiment of the invention;

FIG. 5 is an enlarged view of FIG. 3 at A;

FIG. 6 is a cross-sectional view of a coupling assembly in accordance with one embodiment of the present invention;

FIG. 7 is a secondary cross-sectional view of a coupling assembly in one embodiment of the invention;

FIG. 8 is an enlarged view of FIG. 6 at B;

fig. 9 is a schematic structural diagram of a resonator according to an embodiment of the invention.

Reference numerals: 1. a base; 2. a cover plate; 3. a port; 4. a resonant cavity; 401. a resonant cavity cylinder; 402. a regulating chamber; 403. a resonant cavity; 404. a through port; 5. a coupling assembly; 501. a partition frame; 502. a clamping frame; 503. a flying lever; 504. an adjusting plate; 505. a sliding sleeve; 506. a guide through groove; 507. a screw rod; 508. a knob; 509. a moving block; 510. a clamping plate; 511. a threaded rod; 512. a slide bar; 513. an adjusting knob; 514. a clamping groove; 515. aligning the protruding blocks; 6. a resonating member; 601. a column; 602. a mounting base; 603. installing a screw; 604. and (3) a nut.

Detailed Description

Example 1

As shown in fig. 1-4, the cavity filter provided by the invention comprises a base 1; the upper end of the base 1 is provided with a cover plate 2, a rotatable resonant cavity 4 is arranged inside the base, and a port 3 communicated with the resonant cavity 4 is arranged outside the base. The center of the resonant cavity body 4 is provided with a resonant cavity cylinder 401 in a penetrating manner along the vertical direction, and a ring-shaped resonant chamber is separated by the resonant cavity cylinder; a plurality of resonant cavities 403 are arranged in the resonant chamber, which are connected end to end in turn. Each resonant cavity 403 is internally provided with a resonant piece 6, meanwhile, the outer wall of the ring of the resonant cavity 403 is provided with a through hole 404 which is always communicated with the port 3 in one-to-one correspondence in the rotation process, and a coupling window is arranged between the adjacent resonant cavities 403; the coupling window is provided with a coupling component 5 with a flying lever structure for adjusting the size of the coupling window.

The working principle of this embodiment is as follows: first the worker selects the desired port 3. Since a plurality of ports 3 communicating with the resonant cavity 4 are provided, the filter paths (inlet and outlet) can be selected as required. The operator then adjusts the coupling window size by operating the coupling assembly 5. The width and depth of the coupling window can affect the coupling effect, i.e., the wider the coupling window width, the stronger the capacitive coupling becomes. The deeper the depth, the stronger the capacitive coupling becomes. In addition, the cover plate 2 can be provided with a tuning screw (not shown in the drawing) in threaded connection, and the deeper the tuning screw stretches into the resonant cavity 403, the weaker the capacitive coupling strength. The fly-bar structure also affects the coupling strength. The staff adjusts the relative positions of the signal access point, the resonance piece 6 and the coupling window through rotating the resonance cavity 4, and further adjusts the equipment performance so as to achieve the ideal filtering effect.

Example two

It should be further noted that the upper end of the resonator tube 401 is sealed by the cover plate 2, the lower end is open, and an adjusting cavity 402 for operating the coupling module 5 is provided inside. The operator may extend his or her hand into the adjustment chamber 402

As shown in fig. 5-7, the coupling assembly 5 includes a partition frame 501; the partition frame 501 is arranged on the coupling window, the upper end is provided with a window, and the lower end is provided with a driving piece; two opposite adjusting plates 504 are arranged on two sides of the window, and a clamping frame 502 is also arranged on the window; the two groups of adjusting plates 504 are driven by a driving piece to realize horizontal movement; the engaging frame 502 engages with two sets of adjusting plates 504 from above and adjusts the window size together with both.

It should be further noted that the driving member includes a moving block 509; the lower end of the partition frame 501 is provided with a mounting groove; a rotating screw rod 507 is arranged in the mounting groove; the end of the screw 507 extends into the adjusting cavity 402 and is connected with a knob 508; the lower end of the moving block 509 is connected with the screw 507 by screw thread, and the upper end is connected with the adjusting plate 504. The moving block 509 screwed with the screw 507 is horizontally moved by rotation of the screw 507, so that the distance between the adjusting plates 504 is adjusted.

It should be further noted that, the screw 507 is provided with a reverse thread; the moving blocks 509 are provided with two groups, are respectively in threaded fit with the two ends of the screw 507, and are connected with the adjusting plates 504 in a one-to-one correspondence. By providing opposing threads, the movement of the two sets of adjustment plates 504 is reversed and synchronized.

It should be further noted that, the engaging frame 502 has a U-shaped structure with a downward opening, and its width is matched with the window, that is, it can be engaged on the adjusting plate 504 and engaged with the partition frame 501. A clamping plate 510 clamped with the adjusting plate 504 is arranged in the clamping frame 502; the clamping plate 510 is provided with a threaded rod 511; the upper end of the threaded rod 511 is rotatably connected to the top of the engagement frame 502, and an adjustment knob 513 is provided. The engagement plate 510 is adjusted to move up and down by rotating the threaded rod 511.

In this embodiment, a specific structure of the coupling assembly 5 is provided, and when the adjustment is performed, a worker first takes off the engaging frame 502 and turns the knob 508. The two groups of adjusting plates 504 are driven to move relatively/back on the window by the rotation of the screw 507, and the width of the window is adjusted. Then, the engaging frame 502 is engaged from above, the engaging plate 510 engages with the adjusting plate 504, and the adjusting knob 513 is rotated. The engagement plate 510 is moved up and down on the window by rotation of the threaded rod 511, and the height thereof is adjusted.

Example III

As shown in fig. 5-8, the engaging frame 502 has a U-shaped structure with a downward opening, and its width is matched with the window, that is, it can be engaged on the adjusting plate 504 and engaged with the partition frame 501. A clamping plate 510 is arranged inside the clamping frame 502; the clamping plate 510 is provided with a threaded rod 511, and the bottom is provided with a clamping groove 514. An alignment tab 515 is provided at the upper end of the adjustment plate 504 that slidably engages the detent 514. The alignment projection 515 extends into the clamping groove 514, so that the clamping frame 502 and the adjusting plate 504 are clamped. And the adjustment plate 504 is slid and the alignment tab 515 is moved within the slot 514. The upper end of the threaded rod 511 is rotatably connected to the top of the engagement frame 502, and an adjustment knob 513 is provided. The engagement plate 510 is adjusted to move up and down by rotating the threaded rod 511. The fly-bar structure is disposed below the engagement plate 510.

As shown in fig. 7, the fly-stick structure includes a fly-stick 503; the clamping frame 502 is provided with a guide through groove 506 penetrating through the front wall and the rear wall; a sliding sleeve 505 capable of moving up and down is arranged in the guide through groove 506; fly rod 503 is arranged in sliding sleeve 505, and the end parts face to resonant cavities 403 on two sides; a sliding rod 512 is arranged above the sliding sleeve 505; the slide bar 512 is screwed to the bottom of the threaded rod 511.

In this embodiment, the flying lever structure is set, and by setting the sliding rod 512 and the threaded rod 511, the threaded rod 511 rotates, and in the process of lifting the clamping plate 510, the sliding sleeve 505 synchronously lifts, so as to drive the flying lever 503 to slide relative to the clamping frame 502, and the position of the relative partition frame 501 is unchanged. Only the height of the coupling window is adjusted without changing the position of the fly rod 503 to facilitate adjusting the device performance. The specific location of the flyweight 503 may be set according to threaded rods 511 of different lengths.

As shown in fig. 9, the resonating member 6 includes a cylinder 601; the bottom of the column body 601 is provided with a mounting seat 602; the bottom of the mounting seat 602 is provided with a mounting screw 603; the mounting screw 603 extends out of the resonant cavity 4 and is fixed in cooperation with the nut 604. The cylinder 601 is convenient to install and detach, and convenient to replace and adjust.

Example IV

s1, selecting a required port 3;

s2, connecting a signal input end and a signal output end with the corresponding port 3 respectively;

s3, operating the coupling assembly 5 to adjust the size of a coupling window;

s4, rotating the resonant cavity 4, and adjusting the relative positions of the signal access point, the resonant piece 6 and the coupling window.

The debugging method of the cavity filter is simple to operate and high in adjustability, and can meet the filtering requirements of different users.

The embodiments of the present invention have been described in detail with reference to the drawings, but the present invention is not limited thereto, and various changes can be made within the knowledge of those skilled in the art without departing from the spirit of the present invention.

Claims

1. A cavity filter, characterized by comprising a base (1); the upper end of the base (1) is provided with a cover plate (2), a rotatable resonant cavity (4) is arranged inside, and a port (3) communicated with the resonant cavity (4) is arranged outside;

the center of the resonant cavity body (4) is provided with a resonant cavity cylinder (401) in a penetrating way along the vertical direction, and a ring-shaped resonant chamber is separated by the resonant cavity cylinder; a plurality of resonant cavities (403) which are connected end to end in sequence are arranged in the resonant chamber;

a resonant piece (6) is arranged in each resonant cavity (403), meanwhile, through holes (404) which are communicated with the ports (3) in one-to-one correspondence in the rotation process are arranged on the outer wall of the ring of each resonant cavity (403), and a coupling window is arranged between every two adjacent resonant cavities (403); the coupling window is provided with a coupling component (5) which is used for adjusting the size of the coupling window and is provided with a flying lever structure.

2. A cavity filter according to claim 1, characterized in that the upper end of the resonator tube (401) is closed by a cover plate (2), the lower end is open, and an adjusting cavity (402) for the operation of the coupling element (5) is arranged inside.

3. A cavity filter according to claim 2, characterized in that the coupling assembly (5) comprises a partition frame (501); the partition frame (501) is arranged on the coupling window, the upper end of the partition frame is provided with a window, and the lower end of the partition frame is provided with a driving piece; two opposite adjusting plates (504) are arranged on two sides of the window, and a clamping frame (502) is also arranged on the window; the two groups of adjusting plates (504) are driven by a driving piece to realize horizontal movement; the clamping frame (502) is clamped with the two groups of adjusting plates (504) from the upper part, and the window size is adjusted together with the two groups of adjusting plates.

4. A cavity filter according to claim 3, characterized in that the driving member comprises a moving block (509); the lower end of the partition frame (501) is provided with a mounting groove; a rotating screw rod (507) is arranged in the mounting groove; the end part of the screw rod (507) extends into the adjusting cavity (402) and is connected with a knob (508); the lower end of the moving block (509) is connected with a screw rod (507) in a threaded way, and the upper end of the moving block is connected with an adjusting plate (504).

5. A cavity filter according to claim 4, characterized in that the screw (507) is provided with a reverse thread; the moving blocks (509) are provided with two groups, are respectively in threaded fit with the two ends of the screw rod (507), and are connected with the adjusting plates (504) in a one-to-one correspondence manner.

6. A cavity filter according to claim 3, wherein the engaging frame (502) has a U-shaped structure with a downward opening, and an engaging plate (510) engaged with the adjusting plate (504) is provided inside the engaging frame; the clamping plate (510) is provided with a threaded rod (511); the upper end of the threaded rod (511) is rotationally connected with the top of the clamping frame (502), and an adjusting button (513) is arranged; the fly rod structure is disposed below the engagement plate (510).

7. A cavity filter according to claim 6, wherein the flying bar structure comprises a flying bar (503); the clamping frame (502) is provided with a guide through groove (506) penetrating through the front wall and the rear wall; a sliding sleeve (505) which can move up and down is arranged in the guide through groove (506); the flying rod (503) is arranged in the sliding sleeve (505), and the end parts of the flying rod face to the resonant cavities (403) on two sides; a sliding rod (512) is arranged above the sliding sleeve (505); the sliding rod (512) is connected with the bottom of the threaded rod (511) in a threaded manner.

8. A cavity filter according to claim 6, wherein the bottom of the card (510) is provided with a slot (514); an alignment lug (515) which is in sliding engagement with the clamping groove (514) is arranged at the upper end of the adjusting plate (504).

9. A cavity filter according to claim 1, characterized in that the resonator element (6) comprises a cylinder (601); the bottom of the column body (601) is provided with a mounting seat (602); the bottom of the mounting seat (602) is provided with a mounting screw (603); the mounting screw rod (603) extends out of the resonant cavity (4) and is matched and fixed with the nut (604).

10. A method of tuning a cavity filter comprising any of claims 1-9, characterized by the steps of:

s1, selecting a required port (3);

s2, connecting the signal input end and the signal output end with corresponding ports (3) respectively;

s3, operating the coupling assembly (5) to adjust the size of the coupling window;

s4, rotating the resonant cavity (4) and adjusting the relative positions of the signal access point, the resonant piece (6) and the coupling window.