Narrow-band filtering annular coupler based on quadruple-mode dielectric resonator

Abstract

The invention discloses a narrow-band filtering annular coupler based on a quadruple-mode dielectric resonator, comprising a quadruple-mode dielectric resonator, a metal cavity and four feed metal rods, wherein the four feed metal rods get close to the quadruple-mode dielectric resonator in parallel, and form coupling with the quadruple-mode dielectric resonator; the four feed metal rods are respectively first, second, third and fourth metal rods, the connection line of the second metal rod and the center point of the metal cavity is vertical to the connection line of the third metal rod and the center point of the metal cavity, the first metal rod is located on the axis surfaces of the second and third metal rods, and the connection line of the fourth metal rod and the metal cavity is vertical to the connection line of the first metal rod and the center point of the metal cavity. The narrow-band filtering annular coupler has the characteristics of being miniaturized and high in integration degree, and has creativity and applicability.

Description

technical field [0001] The invention relates to a filter ring coupler, in particular to a narrowband filter ring coupler based on a four-mode dielectric resonator. Background technique [0002] Couplers and bandpass filters are important components of radio frequency front-end circuits in wireless communication systems. Generally, two filters are cascaded with ring couplers to realize the filter coupling function, occupying a large circuit volume, and at the same time, the mismatch between stages also reduces the circuit performance. performance. In order to overcome these problems, many scholars have conducted research to design multifunctional filter couplers. [0003] On a planar printed circuit board (PCB), one or three quarter-wavelength transmission lines in a classic ring coupler can be replaced by four ±K converters with bandpass filtering, or quarter-wavelength and Half-wavelength microstrip resonators are used to construct filter couplers; in addition, multi-laye...

AI Technical Summary

Problems solved by technology

Among them, the most commonly used are dielectric resonators and single-mode resonators in cavities, which can be easily used to realize various filter topologies, but because they are single-mode resonators, more resonant cavities are required , there is a problem of large volume; in order to reduce the volume, multi-mode resonators are also used to design filters, for example, some scholars have constructed dual-mode, three-mode or four-mode dielectric resonators to design filters; in addition, Some scholars use four TE mode dielectric resonators to realize the coupler, but the volume is relatively large; in addition, some scholars use cross-shaped dual-mode dielectric resonators to realize the filter coupler, but only single-order filtering function and poor out-of-band rejection

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