Embedded Tantalum Capacitor Structure for Thin PCB Integration
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Solution Overview
Problem
The miniaturization of implantable medical devices (IMDs) requires smaller and more compact electronic components, particularly capacitors, to increase density and reduce size, while maintaining reliability and capacitance density, as traditional tantalum capacitors add significant thickness to integrated circuit boards.
Innovation Solution
The development of an electrical component featuring tantalum material with tantalum particles disposed within a substrate cavity, a dielectric layer, an electrolyte cathode layer, and conductive foil layers, which forms a capacitor with a thickness of no greater than 600 micrometers, allowing for embedding within integrated circuit boards and reducing overall device size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If traditional tantalum capacitors are used, then capacitance density is achieved, but thickness and overall device size increase significantly
Solution Approach 1:
The patent embeds the capacitor structure within a substrate cavity, nesting the capacitor components (tantalum material, dielectric layer, electrolyte cathode layer, conductive foil layers) inside the substrate thickness rather than adding external height. This nesting approach maintains capacitance density while reducing the overall thickness of the device by utilizing the substrate's internal volume.
Solution Approach 2:
The invention transitions from a traditional vertical stacking configuration to a planar integration approach where the capacitor is formed within the substrate plane. By disposing tantalum material within a cavity and layering dielectric and electrolyte components horizontally, the design achieves high capacitance density without increasing the thickness dimension, effectively moving the capacitance generation into the lateral dimensions.
2Volume of stationary object
If device miniaturization is pursued, then device size is reduced, but available space for electronic components decreases
Solution Approach 1:
By nesting the capacitor structure within the substrate cavity, the invention utilizes the substrate's internal volume rather than requiring additional external space. This allows the capacitor to be integrated within the existing device footprint, maintaining component functionality while reducing overall device volume.
Solution Approach 2:
The patent merges the capacitor structure with the substrate by disposing tantalum material within a substrate cavity and integrating conductive foil layers with the substrate architecture. This consolidation eliminates the need for separate capacitor housings and mounting space, effectively combining multiple functions into a single integrated structure that reduces total device volume.
3Length of stationary object
If capacitor thickness is reduced for miniaturization, then device size decreases, but manufacturing precision requirements increase
Solution Approach 1:
The substrate cavity is formed in advance before inserting the tantalum material and subsequent layers. This preliminary preparation of the cavity structure provides a predefined space that guides and constrains the placement of subsequent thin layers, reducing the precision requirements during final assembly by establishing boundaries and alignment features beforehand.
Solution Approach 2:
The invention applies different structural approaches to different regions: the substrate cavity provides a robust structural framework, while the thin dielectric and electrolyte layers are confined to specific local areas within the cavity. This localized structuring allows thicker, more tolerant substrate regions to support thinner, more precise functional layers, reducing overall manufacturing precision requirements.
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 solution enables the creation of smaller, more compact IMDs with improved capacitance density and reliability, facilitating the integration of capacitors within minimal spaces, thus enhancing the miniaturization and functionality of IMDs.
Implementation Method 1
Such capacitors are passive components that store potential energy in an electric field and are designed to add capacitance to circuits
Implementation Method 2
an electrolyte cathode layer disposed on the dielectric
Data Source
AI summary
Various embodiments of an electrical component and a method of forming such component are disclosed. The electrical component includes a substrate having a first major surface, a second major surface, and a cavity disposed in the substrate. The cavity extends between the first major surface and the second major surface. The electrical component also includes an anode electrode that includes a conductive foil layer disposed on the second major surface of the substrate and over the cavity. Tantalum material is disposed within the cavity and includes tantalum particles. A dielectric layer is disposed on the tantalum particles, and an electrolyte cathode layer is disposed on the dielectric layer. The electrical component also includes a cathode electrode disposed over the cavity.