Integrated LC Filter Device for Compact Harmonic Suppression
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Solution Overview
Problem
Existing broadband harmonic traps using LC circuits become excessively large when implemented with surface mount devices (SMDs) or wiring lines on a substrate, making them undesirable due to size constraints.
Innovation Solution
A filter device configuration that includes an inductor component mounted on a multilayer substrate with a dielectric layer and pad electrodes, where the dielectric layer is positioned between the electrodes to form a capacitor, allowing for reduced size and enhanced electrostatic capacitance control, thereby suppressing harmonic frequencies effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If broadband harmonic trap is implemented using SMDs or wiring lines on a substrate, then the filter functionality is achieved, but the device size becomes large
Solution Approach 1:
The patent combines the inductor component and capacitor into a single integrated structure where the capacitor is formed by pad electrodes and wiring lines on the substrate. This merging eliminates the need for separate SMD capacitor components, thereby reducing overall device size while maintaining the LC circuit filter functionality for suppressing harmonic frequencies.
Solution Approach 2:
The substrate serves multiple functions: it provides mechanical support, electrical connection pathways through wiring lines, and capacitor formation through pad electrodes. The wiring lines simultaneously act as electrical connections and capacitor electrodes, reducing the number of discrete components needed and minimizing device footprint.
2Area of stationary object
If capacitor is formed using pad electrode and electrode structure, then electrostatic capacitance is enhanced and size is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The capacitor structure is segmented into distinct pad electrodes and wiring line electrodes with clearly defined functional regions. The pad electrodes are positioned at specific locations for connection, while wiring lines extend to form the other capacitor electrode, allowing standardized manufacturing processes with controlled precision requirements for each segment.
Solution Approach 2:
The pad electrodes and wiring lines are pre-positioned and patterned on the substrate during substrate fabrication before the inductor component is mounted. This preliminary formation of capacitor structures ensures precise geometric relationships and electrode alignments are built into the substrate design, reducing the need for high-precision assembly operations.
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 configuration enables compact filter devices with improved suppression of RF signal harmonics and fundamental wave passage, while minimizing electromagnetic coupling and size, thus achieving effective frequency band management.
Implementation Method 1
The first pad electrode and the at least part of the first electrode form a first capacitor
Implementation Method 2
a first dielectric layer having a mounting surface... the first dielectric layer is positioned between the first electrode and the first pad electrode
Data Source
AI summary
A filter device includes an inductor component, and a substrate on which the inductor component is mounted, the substrate including a first dielectric layer having a mounting surface, a first pad electrode, which is provided on the mounting surface and to which a first terminal of the inductor component is connected, and a first electrode, which is connected and is provided such that the first dielectric layer is positioned between the first electrode and the first pad electrode. At least part of the first electrode overlaps the first pad electrode when the mounting surface is viewed in a plan view. The first pad electrode and the at least part of the first electrode form a first capacitor.