Multilayer Filter Layout for Wider Attenuation in Less Space
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Solution Overview
Problem
Multilayer filters face challenges in expanding their attenuation band while maintaining a small size due to the complexity and increased size associated with providing multiple LC resonance circuits.
Innovation Solution
Incorporating an open inductor with one end connected to the ground and the other end open, arranged to face an inductor, which forms a capacitor and provides stray capacitance, allowing for equivalent attenuation characteristics without the need for multiple LC resonance circuits, thereby achieving expanded attenuation while maintaining a compact size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple LC resonance circuits are provided to expand the attenuation band, then the attenuation characteristics are improved, but the device complexity and size increase
Solution Approach 1:
The patent combines the functions of multiple LC resonance circuits into a single resonance circuit by strategically positioning an open inductor to face an existing inductor. This creates a merged resonant system that achieves the attenuation bandwidth of multiple circuits while using fewer physical components, directly reducing configuration complexity while maintaining attenuation performance
Solution Approach 2:
The patent utilizes the spatial dimension by arranging the open inductor to face the first inductor across insulator layers. This three-dimensional arrangement allows the creation of equivalent capacitance through spatial positioning rather than adding more circuit elements in the traditional planar configuration, effectively expanding attenuation without increasing circuit count
2Reliability
If multiple LC resonance circuits are provided to expand the attenuation band, then the attenuation characteristics are improved, but the filter size increases
Solution Approach 1:
The patent merges the functionality of multiple resonance circuits into a single compact circuit configuration. By using the open inductor positioned to face the first inductor, the system achieves the combined attenuation effect of multiple circuits without requiring multiple separate resonance circuit assemblies, thereby maintaining a small filter size while expanding the attenuation band
Solution Approach 2:
The open inductor is nested within the existing filter structure, positioned to face the first inductor through insulator layers. This nested arrangement allows the additional resonant function to be integrated into the existing compact form factor rather than requiring external additions that would increase the overall filter volume
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
This configuration enables the expansion of attenuation characteristics similar to those achieved with multiple LC resonance circuits, while significantly reducing the size and complexity of the filter, effectively addressing the issue of space constraints.
Implementation Method 1
the open inductor itself has a stray capacitance
Implementation Method 2
a capacitor is formed between the open inductor and the first output terminal or the inductor
Implementation Method 3
a first LC resonance circuit provided in a line connecting the input terminal to the first output terminal and including a first inductor and a first capacitor
Data Source
AI summary
A multilayer filter includes an element body formed by stacking a plurality of insulator layers, and an input terminal, a first output terminal, and a ground terminal arranged on outer surfaces of the element body, a first LC resonance circuit provided in a line connecting the input terminal to the first output terminal and including a first inductor and a first capacitor, and an open inductor having one end connected to the ground terminal and the other end open are provided in the element body, and the open inductor is arranged to face the first output terminal or the first inductor.