A Dual-Passband Differential Filter Based on Miniaturized Dual-mode Dielectric Resonator

Abstract

The invention relates to a double-passband difference filter based on micro double-mode medium resonators. The filter comprises a metal chamber, two double-mode medium resonators and two sets of difference excitation structures, wherein the middle position of the metal chamber is provided with a metal baffle board used for segmenting the metal chamber into two rectangular chambers, each rectangular chamber is internally provided with one double-mode medium resonator and one set of difference excitation structures arranged at two opposite sides of the double-mode medium resonator, the double-mode medium resonator is a rectangular medium resonator of which the cross section is a square structure, the bottom portion of the double-mode medium resonator directly contacts with a bottom portion of the metal chamber, the diagonal position of the double-mode medium resonator is provided with a pair of tangent angles used for separating an orthogonal degeneration mode, the diagonal line of the pair of tangent angles of each double-mode medium resonator is parallel with the metal baffle board, and projections of the two sets of difference excitation structures on the bottom portion of the metal chamber are four vertexes of a parallelogram. The filter has advantages of small volume, low insertion loss, high passband selectivity and high inter-passband isolation.

Description

technical field [0001] The invention relates to the technical field of communication filtering, in particular to a dual-passband differential filter based on a miniaturized dual-mode dielectric resonator. Background technique [0002] With the rapid development of wireless communication technology, the design of radio frequency integrated circuits becomes more and more complicated. As it packs more functions and signals into a tighter space, it directly leads to high electromagnetic interference between circuit nodes and interference / crosstalk from inter-substrate coupling and free space. [0003] Compared with traditional single-ended circuits, differential topology circuits have the advantages of high anti-interference ability, high reliability and high output power, so many radio frequency devices have adopted differential topologies, such as amplifiers, couplers and filters. At the same time, in order to meet the requirements of the development of communication methods ...

AI Technical Summary

Problems solved by technology

Most of the existing dual-passband differential filters are resonators prepared by printed circuit boards and substrate integrated waveguides. Due to the unloaded quality factor (Q u ) is low, leading to poor performance of the filter, such as high insertion loss and low passband selectivity

[0004] Dielectric resonators can be traced back to the end of the 1930s. However, due to the low level of technology and technology at that time, it was not possible to develop high dielectric constant materials with sufficiently small losses in the microwave frequency band, so dielectric resonators failed. be promoted and applied

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