Mixed-mode dielectric waveguide filter topology
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Solution Overview
Problem
Conventional dielectric waveguide filters face limitations in Q value and insertion loss due to single-layer structures, and conventional double-layer structures have unadjustable coupling structures, leading to poor productivity and debugging challenges.
Innovation Solution
A mixed-mode dielectric waveguide filter is introduced, comprising a single-mode cavity filter and a multi-mode cavity filter, with a parallel topology to improve Q value and reduce insertion loss, and an adjustable coupling structure between single-mode and multi-mode resonant cavities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single-layer dielectric filter is used, then the structure is simple, but the Q value is low and insertion loss is high
Solution Approach 1:
The patent combines single-mode and multi-mode resonant cavities into a hybrid structure. The single-mode cavities provide simple construction while the multi-mode cavity enhances Q value through multiple resonant modes, achieving both structural simplicity and high reliability.
Solution Approach 2:
The filter uses composite dielectric materials with different properties in single-mode and multi-mode cavities. This allows optimization of Q value through material selection while maintaining manufacturing simplicity, resolving the contradiction between structural simplicity and performance reliability.
2Reliability
If a conventional double-layer structure is used, then the Q value is improved, but the coupling structure is fixed and unadjustable
Solution Approach 1:
The patent introduces adjustable coupling mechanisms between cavities that allow dynamic modification of coupling strength. This enables the filter to adapt to different operating conditions and frequency requirements while maintaining improved Q value from the multi-mode structure.
Solution Approach 2:
The filter is divided into independent single-mode and multi-mode cavity modules with separate coupling structures. This segmentation allows independent optimization of each module and adjustable coupling between them, providing both high Q value and adaptability.
3Reliability
If adjacent dual-mode dielectric cavities are welded through coupling plates, then the Q value is improved, but the coupling structure becomes unadjustable and debugging is difficult
Solution Approach 1:
The patent replaces fixed welded coupling plates with adjustable coupling structures that can be modified during debugging. This allows optimization of coupling parameters after assembly while maintaining the Q value benefits of multi-mode cavities, significantly easing the debugging process.
Solution Approach 2:
The patent introduces intermediate adjustable coupling elements between dual-mode cavities that serve as mediators. These intermediaries allow fine-tuning of coupling strength during debugging while maintaining the high Q value performance, resolving the contradiction between improved reliability and manufacturing ease.
4Reliability
If a mixed-mode dielectric waveguide filter with parallel topology is used, then the Q value increases by 60% and insertion loss reduces by 35%, but the device complexity increases
Solution Approach 1:
The patent merges single-mode and multi-mode cavity structures into a unified hybrid filter design. This integration achieves 60% Q value improvement and 35% insertion loss reduction while controlling overall complexity through shared waveguide structures and standardized coupling mechanisms.
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 mixed-mode dielectric waveguide filter increases the Q value by 60% compared to single-mode filters and reduces insertion loss by 35% compared to double-layer structures, while allowing for adjustable coupling and compact design.
Implementation Method 1
a first multi-mode resonant cavity having at least two resonant modes, and a pair of first single-mode resonant cavities, wherein the pair of first single-mode resonant cavities correspond to the first multi-mode resonant cavity and are directly coupled to a respective resonant mode of the first multi-mode resonant cavity
Data Source
AI summary
A mixed-mode dielectric waveguide filter is provided. The mixed-mode dielectric waveguide filter includes a first multi-mode resonant cavity having at least two resonant modes, and a pair of first single-mode resonant cavities, wherein the pair of first single-mode resonant cavities correspond to the first multi-mode resonant cavity, and are directly coupled to a respective resonant mode of the first multi-mode resonant cavity to form a series topology with the first multi-mode resonant cavity, and wherein a parallel topology is formed between resonant modes of the first multi-mode resonant cavity.