Dielectric Waveguide Filter Direct Cross-Coupling Attenuation
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Solution Overview
Problem
Dielectric waveguide filters face challenges in enhancing attenuation characteristics without increasing filter length or using top surface metallization patterns, which are not applicable in certain waveguide filter designs.
Innovation Solution
A dielectric waveguide filter design incorporating both direct and optional cross-coupled resonators, utilizing a base block and a bridge block of dielectric material with conductive coatings, and strategically positioned RF signal transmission windows for efficient RF signal transmission between resonators, allowing for increased attenuation without lengthening the filter or using top surface metallization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional resonators are incorporated to increase attenuation characteristics, then the attenuation performance is improved, but the filter length increases which is not desirable in space-constrained applications
Solution Approach 1:
The patent introduces cross-coupling paths that operate in alternative dimensions or routes between resonators. Instead of simply extending the linear arrangement of resonators to improve attenuation, the invention creates additional coupling pathways that interact in different spatial or functional dimensions, allowing attenuation enhancement without proportional length increase
Solution Approach 2:
The patent employs a composite structure combining direct coupling and cross-coupling mechanisms between resonators. This composite coupling architecture integrates multiple interaction modes (direct inductive/capacitive coupling and alternative cross-coupling paths) to achieve superior attenuation characteristics within a compact form factor
2Reliability
If top surface metallization patterns are used to achieve direct and cross-coupling, then the coupling characteristics are improved, but this approach is not applicable in waveguide filters without top surface metallization
Solution Approach 1:
The patent extracts the coupling functionality from the top surface metallization approach and implements it through alternative means - specifically through cross-coupling paths formed by the waveguide structure itself and dielectric material arrangements. This extraction allows the coupling mechanism to function without requiring top surface metallization patterns
Solution Approach 2:
The patent substitutes the electrical coupling mechanism (metallization patterns) with a structural coupling mechanism using dielectric material configurations and waveguide geometry. The cross-coupling is achieved through the physical arrangement of dielectric blocks and waveguide walls rather than through conductive patterns on the surface
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
The design effectively enhances attenuation characteristics of the waveguide filter without increasing its length or requiring top surface metallization, thereby improving filter performance in space-constrained applications.
Implementation Method 1
a plurality of slots/notches are spaced longitudinally along the length of the monoblock and define a plurality of bridges between the plurality of resonators which provide a direct inductive/capacitive coupling between the plurality of resonators
Data Source
AI summary
A waveguide filter comprising a base block of dielectric material defining at least first and second resonators and a bridge block seated on top of the base block and defining at least a third resonator. In one embodiment, the base block comprises first and second base blocks that have been coupled together in an end to end relationship. An external transmission line or an interior RF signal transmission window or an RF signal transmission bridge provides a cross-coupling RF signal transmission path between the first and second resonators. At least first and second interior RF signal transmission windows provide a direct RF signal transmission path between the first and third resonators and the second and third resonators respectively.