Dielectric waveguide filter

Abstract

The invention discloses a dielectric waveguide filter which comprises a plurality of dielectric resonators, wherein at least two dielectric resonators are connected by an H-shaped coupling structure to form capacitive coupling; the H-shaped coupling structure comprises a structure main body; the structure main body is oppositely provided with a deep groove and a shallow groove; both sides of the H-shaped coupling structure are respectively connected with two dielectric resonators; the H-shaped coupling structure is simple in structure, low process requirements and easy to produce and debug; athickness of a middle part of the H-shaped coupling structure is decided by depths of two grooves together, and even though both sides of the H-shaped coupling structure are ground to different degrees, the thickness of the middle part is also not influenced, so that the thickness of the middle part is easier to control, consistency of the product is improved and meanwhile, the size of the capacitive coupling can be regulated by regulating widths of both the sides and the thickness of the middle of the H-shaped coupling structure; and relative to an existing blind hole, the deep groove and theshallow groove have the advantages of increase of openings, large area, contribution to reduction of the metallization process difficulty and convenience for batch production of the dielectric waveguide filter.

Description

technical field [0001] The invention relates to the technical field of communication equipment components, in particular to a dielectric waveguide filter. Background technique [0002] Compared with traditional metal waveguide filters, dielectric waveguide filters based on high dielectric constant ceramic materials have the advantages of compact size and higher Q value, but limited by the material characteristics of dielectric waveguide filters, generally in the design of filters When it is necessary to add a capacitive coupling structure to achieve transmission zero. [0003] In the prior art, such as figure 1 with figure 2 As shown, the dielectric block 100 includes a resonator 101, a resonator 102, and a coupling structure 104. The resonator 101 and the resonator 102 are connected through a capacitive coupling structure 104. A blind hole 103 is opened on the capacitive coupling structure 104. By controlling the blind hole The distance between 103 and the bottom of the...

AI Technical Summary

Problems solved by technology

[0003] In the existing technology, such as figure 1 and figure 2 As shown, the dielectric block 100 includes a resonator 101, a resonator 102, and a coupling structure 104. The resonator 101 and the resonator 102 are connected through a capacitive coupling structure 104. A blind hole 103 is opened on the capacitive coupling structure 104. By controlling the blind hole The distance between 103 and the bottom of the resonator and the diameter of the blind hole 103 can adjust the capacitive coupling strength. In actual research and development and production, it is found that the above-mentioned dielectric waveguide filter has the following deficiencies: 1. The size of the capacitive coupling is from the blind hole 103 to the bottom of the resonator Distance control, the distance is very sensitive to the size of capacitive coupling, whether CNC engraving, or grinding after mold opening, the fluctuation of the bottom distance of the blind hole will lead to poor product consistency; 2. Due to the deep blind hole and small diameter, The surface metallization process is difficult, and it is prone to silver leakage and silver explosion at the bottom of the hole, which affects the pass rate of the metallization process; 3. The two resonators are connected through the coupling structure 104. Since the coupling structure 104 is small, the connection strength of the two resonators is weak , breakage is prone to occur during processing; 4. Although the coupling strength can be adjusted by adjusting the diameter of the blind hole 103, the larger the diameter, the smaller the size of the resonator 101 and the resonator 102, which will increase the frequency

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