Ceramic Substrate Metallization for Reliable RF Shield Edge Contact
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Solution Overview
Problem
In RF applications, existing ceramic substrates for shielding face challenges in forming reliable electrical connections between conductive features and shielding layers due to variations in cut edges and thermal shrinkage, which affect the integrity of the shielding functionality.
Innovation Solution
A ceramic assembly with conductive features extending across boundaries between regions, allowing for separation to form exposed portions capable of forming electrical connections with a conductive shielding layer, and a method involving printing, punching, and filling of vias with conductive material, followed by cutting or laser cutting to create side walls with exposed conductive features for electrical contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conductive features are formed on ceramic substrates using conventional methods, then manufacturing is straightforward, but reliable electrical connections between conductive features and shielding layers cannot be ensured due to cut edge variations and thermal shrinkage
Solution Approach 1:
The conductive features are formed to extend beyond the boundaries of the ceramic substrate layers before cutting. This preliminary extension ensures that after cutting and thermal shrinkage, sufficient conductive material remains exposed to maintain reliable electrical connections with the shielding layer, compensating for anticipated dimensional variations.
Solution Approach 2:
The conductive features are designed with extended dimensions that accommodate variations in cut edge positioning and thermal shrinkage. By increasing the initial size and extent of the conductive features, the design compensates for parameter variations during manufacturing and firing processes, ensuring consistent electrical contact.
2Reliability
If conductive features extend beyond layer boundaries to ensure electrical connection, then shielding functionality is improved, but manufacturing complexity increases
Solution Approach 1:
The conductive features are segmented into multiple functional zones: portions embedded within ceramic layers for electrical connection to internal circuits, and portions extending beyond layer boundaries for contact with the shielding layer. This segmentation allows each zone to perform its specific function while simplifying the overall design approach.
Solution Approach 2:
The conductive features serve multiple functions simultaneously: they provide electrical connection to internal circuit elements through embedded portions, maintain structural integrity within the ceramic layers, and ensure electrical contact with the external shielding layer through extended portions. This multi-functionality reduces the need for separate components.
3Manufacturing precision
If conductive features are formed through punching and filling vias, then manufacturing precision is improved, but additional manufacturing steps are required
Solution Approach 1:
Vias are punched through the ceramic layers at predetermined positions before the firing process, establishing precise pathways for conductive material. This preliminary via formation ensures accurate positioning of conductive features while allowing subsequent filling operations to proceed efficiently with standard materials and processes.
Data Source
AI summary
Devices and methods related to metallization of ceramic substrates for shielding applications. In some embodiments, a ceramic assembly includes a plurality of layers, the assembly including a boundary between a first region and a second region, the assembly further including a selected layer having a plurality of conductive features along the boundary, each conductive feature extending into the first region and the second region such that when the first region and the second region are separated to form their respective side walls, each side wall includes exposed portions of the conductive features capable of forming electrical connection with a conductive shielding layer.