Multilayer Ceramic Capacitor Bottom Shield Electrode Low Insertion Loss
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Solution Overview
Problem
Current capacitor technologies face challenges in achieving low insertion loss across a broad range of frequencies, particularly in high-frequency applications, due to limitations in design and materials used in multilayer ceramic capacitors.
Innovation Solution
A broadband multilayer ceramic capacitor design featuring a monolithic body with stacked dielectric and active electrode layers, including a bottom shield electrode, which provides a low insertion loss across a wide frequency range by optimizing the spacing and configuration of electrodes and dielectric layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional multilayer ceramic capacitor design is used, then manufacturing simplicity is maintained, but insertion loss increases at high frequencies
Solution Approach 1:
The capacitor structure is segmented into multiple functional layers including dielectric layers, electrode layers, and shield electrode layers. This segmentation allows each layer to perform its specific function optimally, contributing to reduced insertion loss while maintaining manufacturability through standardized layering processes.
Solution Approach 2:
Different regions of the capacitor are assigned different properties: the dielectric layers provide insulation and capacitance, the electrode layers provide conductivity, and the shield electrode layers provide electromagnetic shielding. This local differentiation of properties enables the capacitor to achieve low insertion loss across broad frequency ranges.
2Loss of energy
If capacitor length is increased to improve high-frequency performance, then insertion loss decreases, but the device size increases
Solution Approach 1:
The capacitor design transitions from a single-dimensional length optimization to a multi-dimensional approach by incorporating stacked dielectric and electrode layers in the vertical direction. This allows the capacitor to achieve improved high-frequency performance through increased effective area and optimized electromagnetic field distribution without proportionally increasing the overall device footprint.
Solution Approach 2:
Multiple electrode layers and dielectric layers are nested within each other in a compact stacked configuration. This nesting allows the capacitor to achieve extended electrical path length and improved high-frequency characteristics while maintaining a compact physical size through vertical integration.
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 proposed design achieves an insertion loss of less than -0.5 dB from 1 GHz to 40 GHz, demonstrating improved performance and efficiency in high-frequency applications compared to existing technologies.
Implementation Method 1
The capacitor may include a bottom shield electrode arranged within the monolithic body between the plurality of active electrodes and the bottom surface of the capacitor
Implementation Method 2
a monolithic body comprising a plurality of dielectric layers stacked in the Z-direction. A plurality of active electrodes may be arranged within the monolithic body
Data Source
AI summary
A multilayer capacitor may include a monolithic body including a plurality of dielectric layers. A first external terminal may be disposed along a first end, and a second external terminal may be disposed along a second end of the capacitor. The external terminals may include respective bottom portions that extend along a bottom surface of the capacitor. The bottom portions of the external terminals may be spaced apart by a bottom external terminal spacing distance. A bottom shield electrode may be arranged within the monolithic body between a plurality of active electrodes and the bottom surface of the capacitor. The bottom shield electrode may be spaced apart from the bottom surface of the capacitor by a bottom-shield-to-bottom distance that may range from about 3 microns to about 100 microns. A ratio of a length of the capacitor to the bottom external terminal spacing distance may be less than about 4.