Substrate Filter Circuit With Floating Electrode Capacitance
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Solution Overview
Problem
Existing filter circuits require larger capacitors to secure capacitance, necessitating increased electrode size.
Innovation Solution
A filter circuit design that incorporates capacitors and inductors on a substrate with electrodes facing each other in a specific direction, allowing for reduced electrode area without compromising capacitance, using a floating electrode and ground connection to form capacitors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional capacitor structures are used to secure capacitance, then capacitance is sufficient, but electrode size increases
Solution Approach 1:
The patent utilizes the thickness direction (first direction) of the substrate to create overlapping electrode structures. By forming electrodes that extend in the thickness direction and overlap with each other, the capacitance is increased without expanding the planar area. This dimensional transition from 2D to 3D electrode arrangement resolves the contradiction between sufficient capacitance and minimized electrode size.
Solution Approach 2:
The patent embeds multiple electrode layers within the substrate thickness, creating a nested structure where electrodes are positioned at different depths. The first and second electrodes are formed in the substrate with overlapping regions, and additional electrodes are positioned on opposite surfaces, creating a compact nested arrangement that maximizes capacitance within a minimal footprint.
2Area of stationary object
If electrode area is reduced to make filter circuit smaller, then filter circuit size decreases, but capacitance may be compromised
Solution Approach 1:
The patent compensates for reduced planar electrode area by exploiting the thickness dimension. Electrodes are designed to overlap in the thickness direction, creating effective capacitance through vertical stacking rather than horizontal expansion. This allows the filter circuit to maintain compact size while achieving sufficient capacitance values through the overlapping electrode geometry.
Solution Approach 2:
The patent employs a composite electrode structure where conductive materials are arranged in multiple layers and positions within the substrate. By creating a composite arrangement of electrodes at different depths and positions, the effective capacitance is enhanced without requiring larger planar dimensions, thus maintaining small filter circuit size while ensuring adequate capacitance.
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 smaller filter circuit with maintained capacitance, enabling effective signal attenuation at desired frequencies.
Implementation Method 1
At least a portion of the first electrode and at least a portion of the third electrode face each other in the first direction
Implementation Method 2
At least a portion of the second electrode and at least a portion of the third electrode face each other in the first direction
Implementation Method 3
At least a portion of the third electrode and at least a portion of the fourth electrode face each other in the first direction
Implementation Method 4
an inductor inserted in series into the signal path
Data Source
AI summary
A filter circuit includes: an input terminal; an output terminal; a signal path; an inductor inserted in the signal path; a first capacitor connected to an input path; a second capacitor connected to an output path; and a third capacitor connected to the first capacitor and the second capacitor and connected to a reference potential. The filter circuit includes: a substrate; an element including an inductor; a first electrode connected to an input side of the element; a second electrode connected to an output side of the element; a third electrode being a floating electrode; and a fourth electrode connected to the reference potential. The first electrode and the third electrode face each other to form the first capacitor. The second electrode and the third electrode face each other to form the second capacitor. The third electrode and the fourth electrode face each other to form the third capacitor.