Resonator Filter Layout for Capacitor Electrode Dimensional Errors
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Solution Overview
Problem
Existing filters face challenges in maintaining satisfactory characteristics due to dimensional errors in capacitor electrodes, leading to deterioration of performance.
Innovation Solution
The filter design includes a dielectric substrate with shielding conductors and resonators, featuring via electrodes and coupling capacitance electrodes formed in specific layers and positions to mitigate the impact of dimensional errors, ensuring satisfactory frequency characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If capacitor electrodes are formed in conventional filter designs, then the filter structure is complete and functional, but dimensional errors during formation cause deterioration of filter characteristics
Solution Approach 1:
A coupling capacitance electrode is introduced as an intermediary element between the first shielding conductor and the second capacitor electrode. This coupling capacitance electrode forms a coupling capacitance that compensates for dimensional errors in the capacitor electrodes, thereby maintaining stable filter characteristics even when manufacturing variations occur. The coupling capacitance electrode acts as a buffer that decouples the direct relationship between capacitor electrode dimensions and filter performance.
2Reliability
If more materials and complex structures are used to improve filter characteristics, then performance stability improves, but manufacturing efficiency and cost decrease
Solution Approach 1:
The coupling capacitance electrode is formed in the same layer as the capacitor electrodes, merging the formation process into a single manufacturing step. This eliminates the need for separate processes to create additional compensation structures, thereby maintaining manufacturing efficiency while achieving improved filter characteristic stability through the coupling capacitance mechanism.
3Productivity
If the layer structure is simplified to improve manufacturing, then manufacturing efficiency increases, but the ability to compensate for dimensional errors decreases
Solution Approach 1:
The coupling capacitance electrode serves multiple functions simultaneously: it provides electrical coupling between the shielding conductor and capacitor electrode, and it provides dimensional error compensation for the filter characteristics. This multi-functionality is achieved within the existing layer structure without requiring additional layers, thereby maintaining manufacturing simplicity while achieving precision compensation.
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 suppresses the deterioration of filter characteristics even when dimensional errors occur, maintaining performance by adjusting coupling capacitances and reducing material usage, thereby enhancing manufacturing efficiency and cost-effectiveness.
Implementation Method 1
a plurality of resonators each of which is equipped with a via electrode portion formed between the first shielding conductor and the second shielding conductor, and a capacitor electrode
Implementation Method 2
a first coupling capacitance electrode that is not connected to any one of the plurality of resonators, and that is configured to face toward the first shielding conductor
Data Source
AI summary
A filter comprises: a plurality of resonators, each of which is provided with a via electrode and capacitor electrodes; a first shielding conductor; and a first coupling capacitance electrode that faces the first shield conductor and is not connected to any of the plurality of resonators. The first coupling capacitance electrode is formed on a layer on which a first capacitor electrode is formed, and a part of the first coupling capacitance electrode is positioned between a second capacitor electrode and the first shield conductor.