Via Resonator Filter Layout for Compact Attenuation Pole Control
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Solution Overview
Problem
Existing filters require additional resonance circuits and space for downsizing, which limits their compactness and performance.
Innovation Solution
A filter design incorporating a resonator with a via electrode portion within a dielectric substrate, connected to strip lines and shielding conductors, and capacitors that are capacitively coupled to adjust impedance and form attenuation poles, allowing for a compact and efficient filter configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a parallel resonance trap circuit is added between the input/output terminal and LC resonance circuit, then attenuation amount and impedance adjustment are improved, but device size increases due to additional resonance circuit requirements
Solution Approach 1:
The patent merges the parallel resonance trap circuit functionality directly into the existing LC resonance circuit structure. The inductor and capacitor of the trap circuit are integrated with the LC resonance components, eliminating the need for separate resonance circuits while maintaining the required attenuation characteristics and impedance adjustment capabilities.
Solution Approach 2:
The LC resonance circuit is designed to serve multiple functions simultaneously: it acts as both the main resonance circuit and the parallel resonance trap circuit. The inductor and capacitor elements are configured to provide both impedance matching and attenuation pole formation, allowing a single circuit structure to fulfill what previously required separate dedicated circuits.
2Reliability
If a parallel resonance trap circuit is added between the input/output terminal and LC resonance circuit, then impedance adjustment within pass band is improved, but device complexity increases due to additional resonance circuit
Solution Approach 1:
The patent combines the impedance adjustment function with the main LC resonance circuit. The inductor and capacitor are configured such that their primary resonance function also provides the necessary impedance matching and trap circuit characteristics, eliminating the need for separate impedance adjustment components and simplifying the overall circuit structure.
Solution Approach 2:
The LC resonance circuit elements are designed to perform multiple functions: they provide both the main resonance operation and the parallel resonance trap functionality for impedance adjustment. This multi-functional design reduces circuit complexity by eliminating dedicated separate circuits for each function.
3Reliability
If additional resonance circuits are added to achieve required attenuation, then attenuation characteristics are improved, but manufacturing cost and space requirements increase
Solution Approach 1:
The patent integrates the attenuation function into the existing LC resonance circuit by configuring the inductor and capacitor to simultaneously serve as both resonance elements and trap circuit components. This merging approach reduces the total number of components required, thereby lowering manufacturing costs and simplifying production processes.
Solution Approach 2:
The LC resonance circuit is designed with multi-functionality, where the same inductor and capacitor provide both resonance operation and attenuation characteristics. This eliminates the need for additional dedicated attenuation circuits, reducing component count, manufacturing complexity, and associated costs.
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 achieves a small-sized filter with improved attenuation characteristics and impedance adjustment, enhancing performance by forming desired attenuation poles within the pass band without the need for additional resonance circuits.
Implementation Method 1
a resonator, the resonator including a via electrode portion which is formed within a dielectric substrate, and the resonator including a first strip line which is connected to one end of the via electrode portion and which faces a first shielding conductor among a plurality of shielding conductors that are formed so as to surround the via electrode portion
Implementation Method 2
a first capacitor electrode pattern which is coupled to the input/output terminal, the first capacitor electrode pattern being capacitively coupled to a second capacitor electrode pattern which is connected to the via electrode portion, or being capacitively coupled to the first strip line
Data Source
AI summary
The present invention provides a small-sized filter which has good characteristics. A filter according to the present invention comprises: a resonator which has a via electrode part that is formed within a dielectric substrate and a first strip line that is connected to one end of the via electrode part, while facing a first shielding conductor among a plurality of shielding conductors that are formed so as to surround the via electrode part; an input/output terminal which is coupled to a second shielding conductor among the plurality of shielding conductors; and a first capacitor electrode pattern which is coupled to the input/output terminal. The first capacitor electrode pattern is capacitively coupled to the first strip line or a second capacitor electrode pattern that is connected to the via electrode part.