Even-Mode Resonator Filter Layout for Odd-Mode Suppression
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Solution Overview
Problem
Miniaturization of filters leads to increased size and cutting errors, causing asymmetrical structures that result in decreased noise signal inhibition rates due to the conversion of coupled filters from even-mode to odd-mode.
Innovation Solution
An even-mode resonator filter design comprising multiple resonance units and filter units connected in specific parallel configurations to stabilize the even-mode operation, preventing odd-mode generation and enhancing noise signal inhibition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the filter is miniaturized to meet market demand, then the filter size is reduced, but size and cutting errors increase during production
Solution Approach 1:
The patent introduces asymmetrical structure design in the filter, specifically using asymmetrical coupling between resonance units. This asymmetrical configuration compensates for the manufacturing errors introduced during miniaturization, allowing the filter to maintain even-mode operation despite size reduction and production tolerances
2Volume of moving object
If the filter structure becomes asymmetrical due to size or cutting errors, then the filter is miniaturized, but the coupled filter becomes odd mode, decreasing noise signal inhibition rate
Solution Approach 1:
The patent deliberately introduces controlled asymmetry in the coupling structure between resonance units. This designed asymmetry counteracts the unwanted asymmetry from manufacturing errors, preventing odd-mode generation and maintaining high noise signal inhibition rate even in miniaturized filters
Solution Approach 2:
The patent modifies the coupling parameters between resonance units to optimize the even-mode operation. By adjusting the coupling strength and configuration, the filter maintains its even-mode characteristics despite size reduction, thereby preserving noise signal inhibition performance
3Reliability
If multiple resonance units are connected in parallel to improve quality factor, then the quality factor increases, but the device complexity increases
Solution Approach 1:
The patent divides the filter into multiple resonance units connected in parallel, with each unit contributing to the overall quality factor. This segmentation allows the filter to achieve high Q-factor while maintaining a modular structure that is easier to manufacture and assemble compared to a single complex resonator
Solution Approach 2:
The patent combines multiple resonance units with identical or similar structures in parallel configuration. This merging approach achieves high quality factor through the collective effect of multiple units while using standardized components, thereby reducing overall device complexity compared to using a single complex resonator design
Data Source
AI summary
An even-mode resonator filter is disclosed. The even-mode resonator filter is provided with high stability, and comprises: a first even-mode resonance module, a second even-mode resonance module, a first filter unit and a second filter unit. In the present invention, the first even-mode resonance module comprises a first resonance unit and a second resonance unit, and the second even-mode resonance module comprises a third resonance unit and a fourth resonance unit. By letting the second resonance unit be coupled to the first resonance unit as well as making the third resonance unit be coupled to the fourth resonance unit, the even-mode resonator filter of the present invention has the advantage of eliminating unexpected resonance.