LTCC T/R Assembly Using BGA for RF Isolation
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Solution Overview
Problem
Traditional methods for assembling high-frequency devices, such as Hermetic MIC Module and Stripline Assembly, require extensive and expensive hermetic packaging, leading to increased labor and material costs due to the need for machining and electrical tuning to avoid interference between components.
Innovation Solution
The integration of microwave components using a Low Temperature Co-fired Ceramic (LTCC) system with cavities and coaxial connections, including vias and bump bond arrays, to provide radio isolation and efficient connection within a multi-layer ceramic body, allowing for compact and efficient integration of RF devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional hermetic packaging methods are used to assemble high frequency devices, then radio isolation between components is achieved, but manufacturing complexity and cost increase due to extensive machining and electrical tuning requirements
Solution Approach 1:
The patent combines multiple functions into a single LTCC package structure that simultaneously provides mechanical support, electrical interconnection, and radio frequency isolation. The multi-layer ceramic substrate integrates conductive pathways, shielding layers, and component mounting positions, eliminating the need for separate hermetic packaging and machining operations.
Solution Approach 2:
The LTCC package acts as an intermediary structure that mediates between microwave components and the external environment. It provides controlled electromagnetic environments through integrated shielding layers while maintaining precise electrical connections via conductive vias and land patterns, replacing traditional hermetic sealing and tuning mechanisms.
2Reliability
If traditional hermetic packaging with machining is used, then component isolation is achieved, but material expense and labor costs increase
Solution Approach 1:
The patent changes the fundamental parameters of package construction by transitioning from high-temperature hermetic sealing processes to low-temperature co-fired ceramic technology. This enables integration of passive and active components in a single firing cycle at lower temperatures, reducing manufacturing complexity and cost while maintaining isolation performance.
Solution Approach 2:
The LTCC package utilizes composite ceramic materials with embedded conductors and dielectric layers. This composite structure provides both mechanical integrity and electromagnetic shielding properties, eliminating the need for separate shielding materials and complex assembly operations required in traditional hermetic packaging.
3Reliability
If extensive machining is performed to create cavities for microwave components, then radio frequency isolation is achieved, but productivity decreases due to increased labor and time requirements
Solution Approach 1:
The patent performs preliminary actions during the LTCC fabrication process itself, where conductive pathways, shielding structures, and cavity definitions are created during the ceramic lamination and firing stages. This eliminates the need for subsequent machining operations to create isolation structures, significantly improving productivity.
Solution Approach 2:
The patent replaces mechanical machining processes with ceramic fabrication processes. Instead of mechanically cutting and shaping metal blocks to create isolated cavities, the design uses LTCC lamination and firing to directly form the required structures, eliminating time-consuming machining operations.
Data Source
AI summary
A system is provided for the integration of microwave components in a low temperature co-fired ceramic, the system includes a low temperature co-fired ceramic body having a top surface, into which is disposed a plurality of cavities; a plurality of microwave devices, each device being disposed within a cavity such that the cavities provide radio isolation to the devices; and a coaxial connection disposed within the body configured to connect the devices to external components the coaxial components comprising vias disposed within the co-fired ceramic body.