CN-121983765-A - Capacitive coupling element, dielectric waveguide filter and manufacturing method of capacitive coupling element

Abstract

The invention discloses a capacitive coupling element, a dielectric waveguide filter and a manufacturing method of the capacitive coupling element, and belongs to the technical field of filters. The capacitive coupling element is used for a dielectric waveguide filter, the dielectric waveguide filter comprises a dielectric body and two dielectric resonators integrally formed on the dielectric body, the capacitive coupling element comprises a metal piece and a window which are arranged between the two dielectric resonators, the metal piece and the dielectric body are integrally formed, the window is arranged on the dielectric body, the size of capacitive coupling is commonly adjusted by arranging the metal piece and the window, the metal pieces are fixedly arranged in advance according to the capacitive coupling amounts of different indexes, so that the product has a certain coupling amount, and during later debugging, the window size is adjusted within a certain range to change the coupling amount within a certain range, the adjustment flexibility is good, the fault tolerance is certain, and the process control requirements and the cost are reduced.

Inventors

• Lv Shance
• SONG ZHENGUO
• LI GUIQIANG
• SHEN YALIN
• LIU XU

Assignees

• 苏州立讯技术有限公司

Dates

Publication Date

20260505

Application Date

20260326

Claims (16)

1. 1. The capacitive coupling element is used for a dielectric waveguide filter and comprises a dielectric body and two dielectric resonators integrally formed on the dielectric body, wherein the capacitive coupling element comprises a metal piece and a window which are arranged between the two dielectric resonators, the metal piece and the dielectric body are of an integrally formed structure, and the window is formed in the dielectric body.
2. 2. The capacitive coupling element according to claim 1, wherein the metal piece is a metal sheet or a metal post or a metal via.
3. 3. The capacitive coupling element according to claim 2, comprising more than two of said pieces of metal, of identical or different shape, connected to each other.
4. 4. The capacitive coupling element according to claim 2, comprising more than two of said pieces of metal, of identical or different shape, separated from each other.
5. 5. The capacitive coupling element of claim 1, wherein the metallic piece is a solid structure.
6. 6. The capacitive coupling element of claim 1, wherein the metallic piece is a hollow structure.
7. 7. The capacitive coupling element according to claim 1, wherein two dielectric resonators are arranged along a first direction, the window is a groove concavely formed in an end face of the dielectric body along a second direction, the groove is a rectangular groove, the groove penetrates along a third direction, and the first direction, the second direction and the third direction are perpendicular to each other.
8. 8. The capacitive coupling element according to claim 7, wherein the metal member comprises a metal sheet and two sets of metal posts, the metal posts in the two sets of metal posts being equal in number, the metal posts in the same set being disposed at equal intervals along the second direction, and the two sets of metal posts being disposed on opposite sides of the metal sheet along the first direction, respectively.
9. 9. The capacitive coupling element according to claim 7, wherein the metal member comprises three metal sheets, wherein the three metal sheets are a first connecting sheet extending in a horizontal direction and two second connecting sheets extending in a vertical direction, and the two second connecting sheets are disposed on opposite sides of the first connecting sheet.
10. 10. The capacitive coupling element according to claim 7, wherein the metal piece comprises a metal sheet provided with a plurality of branches and provided with two first grooves, one second groove and one third groove, the two first grooves are arranged on two sides of the metal sheet along a first direction, the notches of the two first grooves are arranged away from each other, the second grooves and the third grooves are arranged on two sides of the metal sheet along a second direction, the notches are arranged away from each other, and the third grooves are arranged around the window.
11. 11. A dielectric waveguide filter comprising a dielectric body, two dielectric resonators integrally formed on the dielectric body, and a capacitive coupling element as claimed in any one of claims 1 to 10.
12. 12. A method of making a capacitive coupling element according to any one of claims 1 to 10, comprising: processing the blank raw porcelain belt to form a filling cavity and a window, filling metal slurry into the filling cavity of the raw porcelain belt, and drying to form a metallized raw porcelain belt; Printing a planar conductive pattern on the metallized green ceramic tape to form a wiring green ceramic tape; and stacking and co-firing the wiring raw porcelain belts and the preset raw porcelain belts according to a preset sequence to form a medium body, wherein the metal slurry forms a metal piece in the filling cavity, and the metal piece and the plane conductive pattern form a low-temperature co-fired ceramic circuit.
13. 13. The method of manufacturing a capacitive coupling element according to claim 12, wherein the blank green tape has a thickness of 10 μm to 30 μm.
14. 14. The method of manufacturing a capacitive coupling element according to claim 12, wherein the metal paste is silver paste or copper paste.
15. 15. The method of making a capacitive coupling element of claim 12, wherein filling the metal paste into a filling cavity comprises: Pre-perforating a first screen plate, and aligning the perforated holes of the first screen plate with the filling cavities of the blank raw porcelain belts; And scraping the metal slurry through the first screen plate by using a scraper, and filling the metal slurry into a filling cavity of the blank green ceramic tape under the action of pressure.
16. 16. The method of making a capacitive coupling element according to claim 12, wherein printing a planar conductive pattern on said metallized green tape to form a wired green tape, comprising: selecting a second screen with the mesh number within a set range, wherein the set range of the mesh number is 200-400 meshes, and the second screen presets a conductive pattern; printing a first sizing agent on the second screen, wherein the first sizing agent is silver paste or copper paste; printing second slurry different from the first slurry, and manufacturing embedded resistors on the metallized green ceramic tape, wherein the second slurry is resistor slurry; And drying the metallized green ceramic tape printed with the first slurry and the second slurry to form the wiring green ceramic tape.

Description

Capacitive coupling element, dielectric waveguide filter and manufacturing method of capacitive coupling element Technical Field The present invention relates to the field of filter technologies, and in particular, to a capacitive coupling element, a dielectric waveguide filter, and a method for manufacturing the capacitive coupling element. Background Dielectric waveguide filters are widely used in modern communication and radar systems due to their high Q (Quality Factor), low loss, high power capacity, etc. By introducing a capacitive coupling element into the dielectric waveguide filter, the frequency selective characteristic and out-of-band rejection characteristic of the dielectric waveguide filter can be improved. In the related art, one way is to load the metal sheet in layers, namely, the metal layer with a designed pattern is clamped between two medium functional layers, and the size of the capacitive coupling is adjusted by adjusting the shape and the position of the metal layer, however, the structure is layered, and the consistency of welding and assembling is poor. Disclosure of Invention An object of one embodiment of the present invention is to provide a capacitive coupling element, a dielectric waveguide filter, and a method for manufacturing the capacitive coupling element, which have no layering structure and good assembly consistency. One embodiment of the invention adopts the following technical scheme: A capacitive coupling element for a dielectric waveguide filter, the dielectric waveguide filter comprising a dielectric body and two dielectric resonators integrally formed on the dielectric body; the capacitive coupling element comprises a metal piece and a window, wherein the metal piece and the dielectric body are integrally formed, the window is arranged between the two dielectric resonators, and the window is formed in the dielectric body. In some embodiments, the metal piece is a metal sheet or a metal post. In some embodiments, more than two of the metal pieces are connected to each other, wherein the metal pieces are identical or different in shape. In some embodiments, more than two of the metal pieces are included, the metal pieces being of the same or different shapes, the metal pieces being separated from each other. In some embodiments, the metal piece is a solid structure. In some embodiments, the metal piece is a hollow structure. In some embodiments, the two dielectric resonators are arranged along a first direction, the window is a groove concavely arranged on an end face of the dielectric body along a second direction, the groove is a rectangular groove, the groove penetrates along a third direction, and the first direction, the second direction and the third direction are perpendicular to each other. In some embodiments, the metal piece comprises a metal sheet and two groups of metal columns, the number of the metal columns in the two groups of metal columns is the same, the metal columns in the same group are arranged at equal intervals along the second direction, and the two groups of metal columns are respectively arranged on two opposite sides of the metal sheet along the first direction. In some embodiments, the metal piece includes three metal sheets, where the three metal sheets are a first connecting sheet extending in a horizontal direction and two second connecting sheets extending in a vertical direction, and the two second connecting sheets are respectively disposed on two opposite sides of the first connecting sheet. In some embodiments, the metal piece comprises a metal sheet, the metal sheet is provided with a plurality of branches and is provided with two first grooves, one second groove and one third groove, the two first grooves are arranged on two sides of the metal sheet along a first direction, the notch of the two first grooves are arranged away from each other, the second grooves and the third grooves are arranged on two sides of the metal sheet along a second direction, the notch of the third grooves are arranged away from each other, and the third grooves are arranged around the window. A dielectric waveguide filter comprising a dielectric body, two dielectric resonators integrally formed on the dielectric body, and a capacitive coupling element as claimed in any one of the preceding claims. A method of making a capacitive coupling element as claimed in any one of the preceding claims, comprising: processing the blank raw porcelain belt to form a filling cavity and a window, filling metal slurry into the filling cavity of the raw porcelain belt, and drying to form a metallized raw porcelain belt; printing a planar conductive pattern on the metallized green ceramic tape to form a wiring green ceramic tape; and stacking and co-firing the wiring raw porcelain belts and the preset raw porcelain belts according to a preset sequence to form a medium body, wherein the metal slurry forms a metal piece in the filling cavity, and the metal piece and the