Dual-mode dielectric filter

Abstract

The invention belongs to the technical field of filters, and particularly discloses a dual-mode dielectric filter which comprises two shells, the two shells are symmetrically arranged up and down, and the opposite sides of the two shells are each provided with two second resonant cavities. First resonant cavities which are uniformly distributed and located between the two second resonant cavities are formed in the opposite sides of the two shells, dual-mode dielectric resonators are arranged in the first resonant cavities, metal resonators are arranged in the second resonant cavities, and tuning mechanisms are arranged on the surfaces of the shells above; by arranging the tuning mechanism, coarse tuning can be realized by directly screwing a rotating shell, fine tuning can be realized by a dial wheel, and a two-stage adjusting mechanism is formed, so that the tuning precision and controllability are remarkably improved, the frequency fine tuning is more fine and stable, and the defects that a traditional direct screwing mode is difficult to control accurately and errors are easy to generate are effectively overcome.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of filters, and specifically discloses a dual-mode dielectric filter. BACKGROUND

[0002] The dual-mode dielectric filter is a key component for frequency selection and signal processing in a microwave communication system, and its performance directly affects the overall efficiency and stability of the communication system. The traditional dual-mode dielectric filter usually adopts a combination of a metal resonant cavity and a dielectric resonator, and the resonant frequency is changed by adjusting the tuning screw in the resonant cavity to meet the requirements of different frequency bands. Through retrieval, a dual-mode dielectric filter (publication number: CN216312017U) is disclosed in a Chinese patent. The patent adopts a buckle structure to assemble multiple resonators, which is simpler than a cascaded mounting structure, has strong expandability, is easy to process, and is convenient for debugging the filter through the tuning screw provided on the shell. However, in the way of directly screwing the bolt into the resonant cavity, there is a lack of fine control mechanism in the adjustment process, especially when high-precision frequency fine-tuning is required, it is often difficult to achieve stable and accurate adjustment, and the frequency may deviate due to operation errors. Therefore, the dual-mode dielectric filter is proposed by the person skilled in the art to solve the above problems. SUMMARY

[0003] Therefore, the dual-mode dielectric filter is proposed by the person skilled in the art to solve the above problems.

[0004] To achieve the above purpose, the application provides a dual-mode dielectric filter, which comprises two housings, the two housings are symmetrically arranged above and below, and the opposite sides of the two housings are provided with two second resonant cavities, the opposite sides of the two housings are provided with a first resonant cavity which is uniformly distributed and located between the two second resonant cavities, the first resonant cavity is provided with a dual-mode dielectric resonator inside, the second resonant cavity is provided with a metal resonator inside, the surface of the upper housing is provided with a tuning mechanism, the surface of the upper housing is provided with a mounting hole which is in communication with the adjacent first resonant cavity, the tuning mechanism extends to the inside of the first resonant cavity through the mounting hole, and the top of the upper housing is provided with two connectors. The tuning mechanism comprises a threaded sleeve fixedly connected to the top of the upper shell and coaxially arranged with the mounting hole, a tuning bolt threadedly connected to the inner wall of the threaded sleeve, the lower end of the tuning bolt sequentially penetrating the threaded sleeve and the mounting hole and extending into the interior of the adjacent first resonant cavity, a rotating shell rotatably connected to the top of the threaded sleeve, a limiting rod fixedly connected to the inner wall of the rotating shell, a limiting slot formed in the top of the tuning bolt, the lower end of the limiting rod extending into the interior of the limiting slot and slidably connected with the inner wall of the limiting slot, and an adjusting assembly arranged on the surface of the rotating shell.

[0005] In the above technical solution, preferably, the adjusting assembly comprises a sliding shell sleeved on the surface of the rotating shell, the lower end of the sliding shell extending to the surface of the threaded sleeve, an installation slot formed in the bottom of the sliding shell, a spring fixedly connected to the inner wall of the installation slot, the lower end of the spring penetrating out of the installation slot and fixedly connected with the surface of the shell, and a limiting area formed in the top of the sliding shell.

[0006] In the above technical solution, preferably, the surface of the threaded sleeve is provided with uniformly distributed sliding grooves, the inner side of the sliding shell is fixedly connected with sliding blocks, and the sliding blocks are slidably connected with the inner walls of the sliding grooves.

[0007] In the above technical solution, preferably, the surface of the rotating shell is sleeved with a rotating ring, the surface of the rotating shell is provided with uniformly distributed sliding grooves, the inner side of the rotating ring is fixedly connected with uniformly distributed sliding blocks slidably connected with the inner walls of the sliding grooves, and the bottom of the rotating shell is rotatably connected with the top of the sliding shell.

[0008] In the above technical solution, preferably, the bottom of the rotating ring is provided with a connecting cavity, the inner wall of the connecting cavity is fixedly connected with a tooth ring, the inner wall of the sliding shell is rotatably connected with a handle, the surface of the handle extends to the exterior of the sliding shell, the top of the handle is fixedly connected with a gear extending into the interior of the connecting cavity, and the gear is meshingly connected with the tooth ring.

[0009] In the above technical solution, preferably, the surface of the rotating shell is fixedly connected with a connecting ring located in the limiting area, the surface of the connecting ring is provided with uniformly distributed clamping grooves, the inner wall of the limiting area is fixedly connected with a limiting column, and the limiting column extends into the interior of the adjacent clamping groove.

[0010] In the above technical solution, preferably, the inner wall of the first resonant cavity is fixedly connected with uniformly distributed protrusions. The double-mode dielectric resonator comprises a dielectric block and a conductive glue ring, the conductive glue ring is sleeved on the surface of the dielectric block, the surface of the conductive glue ring is provided with uniformly distributed insertion grooves, the positions of the insertion grooves are matched with the protrusions, and the volume of the protrusions is greater than the opening volume of the insertion grooves.

[0011] In the above technical scheme, preferably, a groove is formed in the top of the lower shell, a sealing capsule is fixedly connected to the inner bottom wall of the groove, the sealing capsule is filled with inert gas, the inert gas filled in the sealing capsule has a pressure greater than the external air pressure, the bottom of the upper shell is fixedly connected with a plug block matched with the groove, and a sealing groove is formed in the bottom of the plug block.

[0012] Compared with the prior art, the present application has the following beneficial effects: 1. By setting the tuning mechanism, the coarse adjustment can be realized by directly twisting the rotating shell, and the fine adjustment can be realized by the dial, thereby forming a two-stage adjustment mechanism, which significantly improves the tuning accuracy and controllability, makes the frequency fine adjustment more precise and stable, and effectively overcomes the defects of the traditional direct screwing method, such as difficult to accurately control and easy to produce errors. 2. The tuning mechanism integrates a sliding shell with spring return function, which can effectively shield the adjustment gap under normal conditions, prevent dust from entering the internal resonant cavity, and ensure the cleanliness of the internal environment. When adjusting, only the specific part needs to be pressed and rotated, the operation process is integrated, the shell does not need to be disassembled, and the convenience and safety of debugging are greatly improved. 3. The cooperation structure of the pressurized sealing capsule and the sealing groove is adopted at the joint of the two shells. After assembly, the sealing capsule forms an airtight barrier with a higher air pressure in the cavity than the external air, which can effectively block the infiltration of external air and moisture, thereby maintaining the long-term stability of the air pressure and medium environment in the resonant cavity, fundamentally reducing the frequency drift caused by environmental changes, and improving the long-term reliability of the filter. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of the present application; Figure 2 It is a separate schematic diagram of the present application; Figure 3 It is a separate schematic diagram of the tuning mechanism and the shell of the present application; Figure 4 It is a distribution schematic diagram of the first tuning cavity and the second tuning cavity of the present application; Figure 5 It is a structural schematic diagram of the present application; Figure 6 It is a structural schematic diagram of the tuning mechanism of the present application; Figure 7 It is Figure 6 It is an enlarged view of A in the middle; Figure 8 It is a connection schematic diagram of the spring and the sliding shell of the present application.

[0014] In the diagram: 1. Outer shell; 101. Connector; 102. Metal resonator; 103. Dual-mode dielectric resonator; 104. First resonant cavity; 105. Groove; 106. Insert; 107. Protrusion; 108. Sealing capsule; 109. Second resonant cavity; 2. Tuning mechanism; 201. Tuning bolt; 202. Spring; 203. Rotating shell; 204. Limiting rod; 205. Connecting ring; 206. Sliding shell; 207. Threaded sleeve; 208. Toothed ring; 209. Gear; 210. Rotating ring; 211. Dial wheel; 212. Slider; 213. Slide groove; 214. Slot; 215. Limiting post; 216. Sliding groove. Detailed Implementation

[0015] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0016] Numerous specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and therefore the invention is not limited to the specific embodiments disclosed below.

[0017] like Figures 1-8 The dual-mode dielectric filter shown includes two housings 1 arranged symmetrically vertically. Each housing 1 has two second resonant cavities 109 on opposite sides. Each housing 1 has a first resonant cavity 104 evenly distributed between the two second resonant cavities 109 on opposite sides. A dual-mode dielectric resonator 103 is disposed inside the first resonant cavity 104. A metal resonator 102 is disposed inside the second resonant cavity 109. A tuning mechanism 2 is disposed on the surface of the upper housing 1. The surface of the upper housing 1 has mounting holes that communicate with the adjacent first resonant cavity 104. The tuning mechanism 2 extends through the mounting holes into the interior of the first resonant cavity 104. Two connectors 101 are disposed on the top of the upper housing 1. The tuning mechanism 2 includes a threaded sleeve 207 fixedly connected to the top of the upper housing 1 and coaxially arranged with the mounting hole. A tuning bolt 201 is threadedly connected to the inner wall of the threaded sleeve 207. The lower end of the tuning bolt 201 passes through the threaded sleeve 207 and the mounting hole in sequence and extends into the interior of the adjacent first resonant cavity 104. A rotating shell 203 is rotatably connected to the top of the threaded sleeve 207. A limit rod 204 is fixedly connected to the inner wall of the rotating shell 203. A limit groove is opened on the top of the tuning bolt 201. The lower end of the limit rod 204 extends into the interior of the limit groove and slides in connection with the inner wall of the limit groove. An adjustment component is provided on the surface of the rotating shell 203.

[0018] The rotation of the rotating shell 203 can synchronously drive the limiting rod 204 to rotate, and the cross section of the limiting rod 204 is rectangular, so that the rotating shell 203 can drive the tuning bolt 201 to rotate through the cooperation of the limiting rod 204 and the limiting groove during the rotation of the rotating shell 203. Due to the arrangement of the threaded sleeve 207, the tuning bolt 201 can be gradually inserted into the inside of the first resonant cavity 104 under the action of the threaded sleeve 207 cooperating with the tuning bolt 201. The insertion depth of the tuning bolt 201 can be changed by forward and reverse rotation, so that the filter can be debugged, the resonant frequency is changed, and the performance of the filter is adjusted.

[0019] As shown in Figures 1-8 The adjusting assembly comprises a sliding shell 206 sleeved on the surface of the rotating shell 203, the lower end of the sliding shell 206 extends to the surface of the threaded sleeve 207, the bottom of the sliding shell 206 is provided with a mounting groove, the inner wall of the mounting groove is fixedly connected with a spring 202, the lower end of the spring 202 penetrates out of the mounting groove and is fixedly connected with the surface of the shell 1, and the top of the sliding shell 206 is provided with a limiting area.

[0020] The surface of the threaded sleeve 207 is provided with uniformly distributed sliding grooves 216, and the inner side of the sliding shell 206 is fixedly connected with a sliding block which is in sliding connection with the inner wall of the sliding groove 216.

[0021] The surface of the rotating shell 203 is sleeved with a rotating ring 210, the surface of the rotating shell 203 is provided with uniformly distributed sliding grooves 213, the inner side of the rotating ring 210 is fixedly connected with uniformly distributed sliding blocks 212 which are in sliding connection with the inner wall of the sliding grooves 213, and the bottom of the rotating shell 203 is rotatably connected with the top of the sliding shell 206.

[0022] The sliding shell 206 can shield the connecting gap between the rotating shell 203 and the threaded sleeve 207 in the normal state, so that dust does not enter the inside of the two abutted shells 1 through the gap during use, so as to affect the internal environment of the first resonant cavity 104 and the performance of the filter; The spring 202 is arranged to ensure the position of the sliding shell 206 in the normal state, so as to ensure the good dustproof effect of the filter during use; The mutual cooperation of the sliding block and the sliding groove 216 can limit the position of the sliding shell, so that it can only slide up and down without rotating, and the sliding block 212 on the rotating shell 203 can limit the rotating ring 210 to slide up and down along the surface of the rotating shell 203, and can drive the rotating shell 203 to synchronously rotate by driving the rotating ring 210 to rotate under the cooperation of the sliding block 212 and the sliding groove 213, so as to realize the adjustment of the tuning bolt 201.

[0023] As shown in Figures 1-8As shown, the bottom of the rotating ring 210 is provided with a connecting cavity, the inner wall of the connecting cavity is fixedly connected with a gear ring 208, the inner wall of the sliding shell 206 is rotatably connected with a rotating wheel 211, the surface of the rotating wheel 211 extends to the outside of the sliding shell 206, the top of the rotating wheel 211 is fixedly connected with a gear 209 extending to the inside of the connecting cavity, and the gear 209 is meshed with the gear ring 208.

[0024] The surface of the rotating shell 203 is fixedly connected with a connecting ring 205 located in the limiting area, the surface of the connecting ring 205 is provided with uniformly distributed clamping grooves 214, and the inner wall of the limiting area is fixedly connected with a limiting column 215 extending to the inside of the adjacent clamping groove 214.

[0025] The rotating wheel 211 can drive the gear 209 meshed therewith to rotate synchronously, in this process, the gear 209 drives the gear ring 208 meshed therewith to rotate, and in this process, the rotation of the gear ring 208 can drive the rotating ring 210 to rotate synchronously, specifically, the diameter ratio between the gear 209 and the gear ring 208 is 36:1 (the ratio can be adjusted according to actual conditions), that is, rotating the gear 209 by one revolution drives the gear ring 208 to rotate the rotating ring 210 by one thirty-sixth revolution, so as to achieve the purpose of fine adjustment; After the staff realizes the preliminary adjustment by rotating the shell 203, the rotating wheel 211 is used for fine adjustment, and this kind of mode can realize accurate adjustment according to the debugging needs; The cooperation of the clamping groove 214 and the limiting column 215 can realize the setting of the connecting ring 205 under the cooperation of the two, because the limiting column 215 is directly fixed on the sliding shell 206, and the sliding shell 206 is limited by the sliding block and the sliding groove 216 and cannot directly rotate, so that the limiting column 215 and the clamping groove 214 can be used for the limiting purpose of the connecting ring 205, and then the limiting of the rotating shell 203 can be realized, so that the rotating shell 203 cooperates with the limiting rod 204 and the limiting groove to realize the positioning of the tuning screw 201, avoiding the position deviation of the tuning screw 201 affecting the use effect of the filter when not adjusted; By pressing the rotating ring 210, the sliding shell 206 can be driven to move downward synchronously, in this process, the limiting column 215 can be driven to move synchronously, so that the limiting of the rotating shell 203 can be released after the limiting column 215 is separated from the clamping groove 214, so as to facilitate the staff to rotate the rotating shell 203 to adjust the position of the tuning screw 201.

[0026] As Figures 1-8As shown, the inner wall of the first resonant cavity 104 is fixedly connected with uniformly distributed protrusions 107; the double-mode dielectric resonator 103 comprises a dielectric block and a conductive glue ring, the conductive glue ring is sleeved on the surface of the dielectric block, and the surface of the conductive glue ring is provided with uniformly distributed insertion grooves, the positions of the insertion grooves match the protrusions 107, and the volume of the protrusions 107 is greater than the opening volume of the insertion grooves.

[0027] The top of the lower shell 1 is provided with a groove 105, the inner bottom wall of the groove 105 is fixedly connected with a sealing capsule 108, the inside of the sealing capsule 108 is filled with inert gas, and the inert gas filled in the inside of the sealing capsule 108 has a pressure greater than the external air pressure, the bottom of the upper shell 1 is fixedly connected with an insertion block 106 matching the groove 105, and the bottom of the insertion block 106 is provided with a sealing groove.

[0028] The mutual cooperation of the insertion groove and the protrusion 107 can enhance the positioning effect of the double-mode dielectric resonator 103, avoid the occurrence of deviation during use, and at the same time, after the butt joint of the two shells 1 is completed, the shells 1 can be fixed by means of bolts, and during the insertion process, the insertion block 106 can be inserted into the inside of the groove 105, and after installation, the sealing capsule 108 fills the inside of the sealing groove, and the inside of the sealing groove is provided with a space smaller than the volume of the sealing capsule 108, so that the sealing capsule 108 is deformed and filled in the inside of the sealing groove, further extruding the internal inert gas to increase the air pressure, which can increase the sealing effect of the connection, and due to the setting that the internal air pressure of the sealing capsule 108 is greater than the external air pressure, the air pressure difference can ensure that external air cannot enter the inside of the first resonant cavity 104 and the second resonant cavity 109 through the connection gap between the two shells 1, and the stability of the internal gas is ensured, thereby avoiding the influence of gas flow on the filter.

[0029] Working principle: by rotating the rotating shell 203, the limiting rod 204 can be rotated synchronously, and the cross section of the limiting rod 204 is rectangular, so that the limiting rod 204 can drive the tuning bolt 201 to rotate in the process of rotating the rotating shell 203, and due to the setting of the threaded sleeve 207, the tuning bolt 201 can be gradually inserted into the inside of the first resonant cavity 104 under the action of the threaded sleeve 207 cooperating with the tuning bolt 201, and the insertion depth of the tuning bolt 201 can be changed by means of forward and reverse rotation, so that the filter can be debugged, and the resonant frequency can be changed, thereby adjusting the performance of the filter, and the rotation of the rotating handle 211 can drive the gear 209 engaged therewith to rotate synchronously, in this process, the gear 209 drives the gear ring 208 engaged therewith to rotate, and in this process, the rotation of the gear ring 208 drives the rotating ring 210 to rotate synchronously, so as to achieve the purpose of fine adjustment.

[0030] The above shows and describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited to the above-mentioned embodiments, and the above-mentioned embodiments and descriptions in the specification are only the principles of the present application. Various changes and improvements can be made without departing from the spirit and scope of the present application, and these changes and improvements all fall within the scope of the claimed present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A dual-mode dielectric filter, comprising two housings (1), characterized in that, The two outer shells (1) are arranged symmetrically on top of each other, and two second resonant cavities (109) are opened on opposite sides of the two outer shells (1). A first resonant cavity (104) is evenly distributed and located between the two second resonant cavities (109) on opposite sides of the two outer shells (1). A dual-mode dielectric resonator (103) is arranged inside the first resonant cavity (104). A metal resonator (102) is arranged inside the second resonant cavity (109). A tuning mechanism (2) is arranged on the surface of the upper outer shell (1). A mounting hole is opened on the surface of the upper outer shell (1) to communicate with the adjacent first resonant cavity (104). The tuning mechanism (2) extends through the mounting hole to the interior of the first resonant cavity (104). Two connectors (101) are arranged on the top of the upper outer shell (1). The tuning mechanism (2) includes a threaded sleeve (207) fixedly connected to the top of the outer shell (1) and coaxially arranged with the mounting hole. The inner wall of the threaded sleeve (207) is threaded with a tuning bolt (201). The lower end of the tuning bolt (201) passes through the threaded sleeve (207) and the mounting hole in sequence and extends into the interior of the adjacent first resonant cavity (104). The top of the threaded sleeve (207) is rotatably connected with a rotating shell (203). The inner wall of the rotating shell (203) is fixedly connected with a limiting rod (204). The top of the tuning bolt (201) is provided with a limiting groove. The lower end of the limiting rod (204) extends into the interior of the limiting groove and slides with the inner wall of the limiting groove. The surface of the rotating shell (203) is provided with an adjustment component.

2. The dual-mode dielectric filter according to claim 1, characterized in that, The adjustment assembly includes a sliding shell (206) sleeved on the surface of the rotating shell (203). The lower end of the sliding shell (206) extends to the surface of the threaded sleeve (207). The bottom of the sliding shell (206) is provided with an installation groove. A spring (202) is fixedly connected to the inner wall of the installation groove. The lower end of the spring (202) passes through the installation groove and is fixedly connected to the surface of the outer shell (1). A limiting area is provided at the top of the sliding shell (206).

3. The dual-mode dielectric filter according to claim 2, characterized in that, The threaded sleeve (207) has evenly distributed sliding grooves (216) on its surface. A sliding block is fixedly connected to the inner side of the sliding shell (206), and the sliding block is slidably connected to the inner wall of the sliding groove (216).

4. The dual-mode dielectric filter according to claim 3, characterized in that, The rotating shell (203) is fitted with a rotating ring (210) on its surface. The rotating shell (203) has evenly distributed sliding grooves (213) on its surface. The rotating ring (210) is fixedly connected to a slider (212) that is evenly distributed and slidably connected to the inner wall of the sliding groove (213). The bottom of the rotating shell (203) is rotatably connected to the top of the sliding shell (206).

5. The dual-mode dielectric filter according to claim 4, characterized in that, The bottom of the rotating ring (210) is provided with a connecting cavity, and a toothed ring (208) is fixedly connected to the inner wall of the connecting cavity. A dial wheel (211) is rotatably connected to the inner wall of the sliding shell (206). The surface of the dial wheel (211) extends to the outside of the sliding shell (206). A gear (209) extending into the connecting cavity is fixedly connected to the top of the dial wheel (211). The gear (209) meshes with the toothed ring (208).

6. The dual-mode dielectric filter according to claim 5, characterized in that, The rotating shell (203) is fixedly connected to a connecting ring (205) located inside the limiting area. The surface of the connecting ring (205) is provided with uniformly distributed slots (214). The inner wall of the limiting area is fixedly connected to a limiting post (215), which extends into the interior of the adjacent slot (214).

7. The dual-mode dielectric filter according to claim 1, characterized in that, The inner wall of the first resonant cavity (104) is fixedly connected with uniformly distributed protrusions (107). The dual-mode dielectric resonator (103) includes a dielectric block and a conductive rubber ring. The conductive rubber ring is sleeved on the surface of the dielectric block, and the surface of the conductive rubber ring has uniformly distributed slots. The position of the slots matches the protrusion (107), and the volume of the protrusion (107) is larger than the opening volume of the slot.

8. The dual-mode dielectric filter according to claim 1, characterized in that, The top of the lower outer shell (1) is provided with a groove (105), and a sealing bladder (108) is fixedly connected to the inner bottom wall of the groove (105). The sealing bladder (108) is filled with inert gas, and the pressure of the inert gas inside the sealing bladder (108) is greater than the external pressure. The bottom of the upper outer shell (1) is fixedly connected with a plug (106) that matches the groove (105), and a sealing groove is provided at the bottom of the plug (106).

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