Multilayer LC Resonator Layout for Stable Filter Frequency
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Solution Overview
Problem
Multilayer filters with LC resonant circuits suffer from unwanted spurious components and degraded attenuation characteristics due to parasitic inductive components and susceptibility to external magnetic fields, which affect their frequency characteristics.
Innovation Solution
The design includes a multilayer resonator and filter with carefully arranged capacitor and inductor electrodes within the multilayer body, avoiding overlap to minimize unwanted capacitance and positioning inductors within the dielectric layers to prevent corrosion and external magnetic field interference, thereby stabilizing the inductive and capacitive components of the LC parallel resonant circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If routing lines are added to connect capacitor electrodes to input-output terminals, then electrical connection is achieved, but parasitic inductive component increases causing spurious components and degraded attenuation characteristics
Solution Approach 1:
The patent extracts and eliminates the routing lines from the filter structure. Instead of adding external routing lines to connect capacitor electrodes to input-output terminals, the invention reconfigures the electrode arrangement so that capacitor electrodes are directly connected to input-output terminals without intermediate routing lines, thereby removing the source of parasitic inductance
Solution Approach 2:
The patent utilizes the third dimension (vertical stacking) to arrange electrodes and terminals. By positioning capacitor electrodes and input-output terminals in different layers of the multilayer body, direct vertical connections are established, eliminating the need for horizontal routing lines that would introduce parasitic inductance
2Reliability
If ground electrode is formed on outer surface by plating, then grounding connection is achieved, but via electrodes suffer corrosion increasing loss and degrading frequency characteristics
Solution Approach 1:
The patent extracts the ground electrode from the outer surface position and relocates it to an inner layer of the multilayer body. By positioning the ground electrode between capacitor electrodes rather than on the outer surface, the via electrodes connecting to it are protected from external corrosion while maintaining effective grounding
Solution Approach 2:
The patent introduces an intermediate ground electrode layer within the multilayer body that serves as a protected grounding point. This intermediate ground layer acts as a mediator, providing grounding functionality while shielding the connecting via electrodes from external environmental factors that cause corrosion
3Adaptability or versatility
If via electrodes are exposed to external magnetic field during use, then magnetic coupling occurs, but frequency characteristics are degraded
Solution Approach 1:
The patent extracts the inductor from external exposure by positioning it entirely within the multilayer body structure. The inductor is formed using internal via electrodes and conductive layers surrounded by dielectric material, removing it from the external environment where magnetic fields would cause unwanted coupling
Solution Approach 2:
The patent uses dielectric layers as shielding structures surrounding the inductor and via electrodes. These dielectric layers act as protective shells that isolate the sensitive inductive elements from external magnetic fields, preventing unwanted magnetic coupling while allowing the inductor to function within the resonant circuit
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 results in stable frequency characteristics, reduced parasitic components, and improved resistance to external influences, enhancing the reliability and performance of the multilayer resonators and filters in high-frequency applications.
Implementation Method 1
first and second capacitor internal electrodes, an inductor internal electrode, a first inductor via electrode, a second inductor via electrode... define an LC parallel resonant circuit
Data Source
AI summary
A multilayer filter includes a plurality of mutually coupled resonant circuits provided within a multilayer body. Capacitor internal electrodes, inductor internal electrodes, and inductor via electrodes, ground via electrodes, and input-output via electrodes are arranged within the multilayer body. The ground via electrodes and the input-output via electrodes are provided on a dielectric layer on a mounting surface, or a second dielectric layer on a first dielectric layer provided on the mounting surface. The capacitor internal electrodes arranged towards the side of the mounting surface do not overlap the input-output electrodes when viewed in plan view. With this configuration, degradation in frequency characteristics of a resonant circuit is effectively prevented by controlling one of an inductive component and a capacitive component of the resonant circuit.