Dielectric Waveguide Filter Parasitic Coupling Suppression
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Dielectric waveguide filters face challenges in suppressing parasitic coupling, which affects their electrical performance, especially in 5G radio frequency systems where out-of-band suppression is critical and traditional methods may increase parasitic coupling.
Innovation Solution
A dielectric waveguide filter design featuring a dielectric substrate with resonators connected by negative coupling blind holes and tuning blind holes, utilizing conductive shielding layers and reinforcing ridges to manage parasitic coupling, including first and second coupling structures and conductive shielding layers to reduce parasitic interactions between resonators.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a blind hole with certain depth is used to implement low-end transmission zero, then out-of-band suppression is improved, but parasitic coupling increases
Solution Approach 1:
A conductive shielding layer is introduced as an intermediary element between adjacent resonators. This shielding layer is positioned at strategic locations to block parasitic electromagnetic coupling paths while allowing the blind holes to maintain their transmission zero function. The shielding layer acts as a mediator that separates the harmful coupling effect from the useful filtering function.
Solution Approach 2:
The filter structure is segmented into isolated resonator units by introducing conductive shielding layers and adjusting blind hole configurations. This segmentation breaks the continuous parasitic coupling paths between resonators while preserving the individual resonator functions and their intended electromagnetic interactions.
2Volume of moving object
If dielectric waveguide filter is used instead of traditional waveguide filter, then miniaturization is achieved, but parasitic coupling becomes more significant
Solution Approach 1:
Conductive shielding layers are positioned between closely spaced resonators in the miniaturized dielectric waveguide structure. These shielding layers serve as intermediaries that prevent parasitic coupling while allowing the compact design to maintain its size advantages. The shielding layers are integrated into the existing dielectric substrate without significantly increasing overall volume.
Solution Approach 2:
The blind holes are configured with specific depth and positioning characteristics that differ from traditional designs. By optimizing the local geometry of blind holes and their relationship with conductive shielding layers, the filter achieves miniaturization while controlling parasitic coupling through localized structural modifications rather than global redesign.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Effectively suppresses parasitic coupling, enhancing the electrical performance of the dielectric waveguide filter while simplifying processing and implementation, thereby supporting the miniaturization and high-performance requirements of 5G devices.
Implementation Method 1
an outer surface of each resonator, inner surfaces of all the tuning blind holes and an inner surface of the negative coupling blind hole are all provided with a first conductive shielding layer
Implementation Method 2
a dielectric waveguide filter, comprising a dielectric substrate, the dielectric substrate comprises a plurality of resonators
Implementation Method 3
the ceramic dielectric material is formed by die casting, and plays a role of signal transmission and structure support
Implementation Method 4
the dielectric substrate comprises a plurality of resonators, and the plurality of resonators are connected to each other
Data Source
AI summary
The present invention relates to a dielectric waveguide filter, comprising a dielectric substrate, wherein the dielectric substrate comprises a plurality of resonators; the plurality of resonators are connected to each other; the dielectric substrate further comprises a negative coupling blind hole; the negative coupling blind hole is arranged at a joint between two adjacent resonators; the two adjacent resonators are respectively provided with a tuning blind hole; and the tuning blind hole of one of the two adjacent resonators is connected to the negative coupling blind hole by a first coupling structure. The present invention can effectively suppress parasitic coupling of the dielectric waveguide filter.