Single-Layer Capacitor Structure With Resistive Layer for Wider RF Response
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Solution Overview
Problem
The frequency response of single layer capacitors (SLCs) limits their end applications, and increasing the equivalent series resistance (ESR) could expand their applicability.
Innovation Solution
A single layer capacitor design incorporating a resistive layer over a substrate with conductive layers on opposite surfaces, enhancing ESR and broadening frequency response.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single layer capacitor is designed with conventional structure, then it provides temperature stability and high breakdown voltage, but the frequency response is limited
Solution Approach 1:
The capacitor structure is segmented into multiple functional layers: a dielectric layer, a first conductive layer, a second conductive layer, and a resistive layer. This segmentation allows each layer to contribute specific properties, where the resistive layer specifically addresses the frequency response limitation while the dielectric layer maintains temperature stability and breakdown voltage characteristics.
Solution Approach 2:
The capacitor employs a composite structure combining different material properties: the dielectric layer provides electrical insulation and temperature stability, while the resistive layer introduces controlled resistance to improve frequency response. This composite approach allows the capacitor to simultaneously achieve reliable electrical performance and expanded frequency applicability.
2Adaptability or versatility
If the equivalent series resistance (ESR) is increased to expand application scope, then the Q factor decreases and frequency response improves, but the capacitor performance in traditional applications may be affected
Solution Approach 1:
The invention changes the electrical parameters of the capacitor by introducing a resistive layer with specific resistance characteristics. This parameter change increases the ESR from conventional low values to optimized values that broaden frequency response while maintaining acceptable Q factor for expanded applications including RF shunt and noise filtering.
Solution Approach 2:
The resistive layer is applied locally rather than uniformly throughout the capacitor structure. This local quality approach allows the resistive properties to be concentrated where they most effectively influence frequency response, while other regions maintain optimal electrical characteristics for maintaining Q factor and overall reliability.
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 increased ESR reduces the Q factor, improving performance in active RF devices, RF shunt applications, and noise filtering, while increasing frequency range and enabling miniaturization.
Implementation Method 1
Increasing the equivalent series resistance (ESR) could expand the application of SLCs
Implementation Method 2
single layer capacitor can include a substrate having a first surface and a second surface opposite the first surface. A resistive layer can be formed over at least a portion of the first surface of the substrate. A first conductive layer can be formed over at least a portion of the resistive layer. A second conductive layer can be formed over at least a portion of the second surface of the substrate
Data Source
AI summary
A single layer capacitor can include a substrate having a first surface and a second surface opposite the first surface. A resistive layer can be formed over at least a portion of the first surface of the substrate. A first conductive layer can be formed over at least a portion of the resistive layer. A second conductive layer can be formed over at least a portion of the second surface of the substrate. As such, the single layer capacitor can include a resistor and a capacitor formed in series with one another.