LC Filter Conductive Substrate Capacitor Vertical Sandwich
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Solution Overview
Problem
Existing chip-type LC filters face challenges in achieving large capacitance without increasing the number of conductive layers, leading to thickness issues.
Innovation Solution
The use of a conductive substrate as a capacitive electrode vertically sandwiches the capacitive insulating film, allowing for sufficient capacitance without increasing the number of conductive layers, and incorporating inductor patterns and terminal electrodes to enhance attenuation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If two capacitive electrodes are formed on one surface of the capacitive insulating film, then the manufacturing process is simple, but the capacitance is insufficient
Solution Approach 1:
The patent transitions from a planar configuration (both electrodes on the same surface) to a vertical configuration (electrodes on opposite surfaces of the insulating film). This dimensional change enables the formation of a true capacitor structure with sufficient capacitance while maintaining manufacturing simplicity through sequential deposition processes.
2Quantity of substance
If two capacitive electrodes are formed vertically to sandwich the capacitive insulating film, then the capacitance is sufficient, but the number of conductive layers increases and the thickness of the LC filter increases
Solution Approach 1:
The patent merges the ground electrode function with the conductive substrate (resin sheet with conductive particles). By making the conductive substrate itself serve as one of the capacitive electrodes, the patent eliminates the need for an additional ground conductive layer, thereby maintaining thin profile while achieving sufficient capacitance through vertical electrode arrangement.
3Quantity of substance
If the conductive substrate is used as a capacitive electrode, then the capacitance is sufficient without increasing the number of conductive layers, but the inductor pattern design becomes more complex to achieve adequate attenuation
Solution Approach 1:
The patent divides the inductor into multiple patterns (first inductor pattern and second inductor pattern) with different configurations. The first inductor pattern uses a spiral design connected to the capacitive electrode, while the second uses a meander design connected to the common terminal. This segmentation allows each inductor pattern to be optimized for specific attenuation requirements, achieving adequate overall performance without excessive complexity.
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 an LC filter with high capacitance and low height, providing a wider attenuation band and improved performance compared to traditional designs.
Implementation Method 1
a first capacitive insulating film having one surface covered with the conductive substrate and the other surface covered with a first capacitive electrode
Implementation Method 2
a first inductor pattern having one end connected to the first capacitive electrode
Data Source
AI summary
Disclosed herein is an LC filter that includes a conductive substrate, a first capacitive insulating film having one surface covered with the conductive substrate and other surface covered with a first capacitive electrode, a first inductor pattern having one end connected to the first capacitive electrode, a first terminal electrode connected to other end of the first inductor pattern, and a common terminal electrode connected to the conductive substrate.