Dielectric Filter Resonator Layout for Compact Capacitive Coupling
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current dielectric filters face challenges in miniaturization while maintaining high performance, particularly in achieving dual mode resonances and capacitive coupling, which are difficult to produce and can lead to spurious issues.
Innovation Solution
The dielectric filter design incorporates a body with dual mode resonant units and single mode resonant units, featuring frequency resonant holes and coupling adjustment holes. A groove structure separates the resonant units, optimizing the placement of resonant holes to achieve dual mode operation and capacitive coupling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If dual mode resonant units are used to miniaturize the filter, then the filter size is reduced, but the manufacturing complexity increases due to difficulty in achieving capacitive coupling
Solution Approach 1:
The filter body is divided into multiple resonant units (dual mode resonant units and single mode resonant units) that are spatially separated by groove structures. This segmentation allows each unit to be independently designed and positioned, simplifying the achievement of capacitive coupling between units while maintaining the miniaturized dual-mode operation within the compact filter volume.
2Reliability
If capacitive coupling is implemented to achieve high selectivity, then filter performance is improved, but additional structures such as PCB or plating patterns are needed which increase device complexity
Solution Approach 1:
The groove structures serve dual purposes: they physically separate adjacent resonant units to enable capacitive coupling, and simultaneously function as the coupling mechanism itself. This merging of separation and coupling functions eliminates the need for additional PCB structures or plating patterns, achieving high selectivity through the integral groove design rather than separate coupling components.
3Volume of moving object
If resonant units are closely arranged to minimize filter size, then volume is reduced, but spurious issues occur due to unwanted coupling between units
Solution Approach 1:
The groove structures act as intermediary elements between adjacent resonant units. These grooves provide controlled capacitive coupling at the intended coupling points while the physical separation and geometric design of the grooves suppress unwanted coupling paths, thereby eliminating spurious signals while maintaining close arrangement for miniaturization.
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
This design minimizes the filter's structure, simplifies manufacturing, reduces radio size and weight, enhances performance, and improves production efficiency while maintaining high selectivity and reducing insertion loss.
Implementation Method 1
Each of the resonators generates a resonant frequency at an operating pass band
Implementation Method 2
By using capacitive coupling, a transmission zero is formed at the lower side of the passband
Data Source
AI summary
Disclosed is a dielectric filter. The dielectric filter includes a body; at least one dual mode resonant unit and at least one single mode resonant unit arranged in the body; and a groove structure formed in the body and configured to partially separate the at least one single mode resonant unit and the at least one dual mode resonant unit adjacent thereto. Each dual mode resonant unit at least has a first frequency resonant hole and a second frequency resonant hole. Each single mode resonant unit has a third frequency resonant hole. The first frequency resonant hole has a first longitudinal extension line perpendicular to a second longitudinal extension line of the second frequency resonant hole. The third frequency resonant hole has a third longitudinal extension line parallel to the first longitudinal extension line.