Conformal RF Shielding on Ceramic Substrates
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Solution Overview
Problem
Radio-frequency (RF) devices face performance degradation due to electromagnetic interference (EMI), which existing shielding technologies do not adequately address, particularly in packaged RF modules.
Innovation Solution
A packaged electronic device with a ceramic substrate featuring a conductive layer in electrical contact with a ground plane, a conformal conductive coating over the die, and electrical connections between the coating and the conductive layer, providing effective shielding functionality while maintaining a low-profile design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If traditional EM shields are used in RF modules, then shielding effectiveness is improved, but device profile and compactness deteriorate
Solution Approach 1:
The patent merges the shielding function with the existing package structure by implementing a conformal conductive coating directly on the die surface and electrically connecting it to the ground plane through the underfill material. This integration eliminates the need for separate shielding structures, achieving EMI protection while maintaining a low-profile device design.
Solution Approach 2:
The patent uses a thin conformal conductive coating applied directly on the die surface, which provides shielding functionality without adding significant thickness. The conductive underfill material also acts as a thin film connector, establishing electrical connection between the coating and ground plane while occupying minimal space.
2Object-affected harmful factors
If conformal conductive coating is applied directly on the die, then shielding coverage is improved, but manufacturing complexity increases
Solution Approach 1:
The patent applies the conformal conductive coating to the die surface before mounting the die onto the substrate. This preliminary action allows the coating to be applied to the bare die in a controlled manner, ensuring uniform coverage and proper electrical connection pathways are established before the die is permanently fixed in its final position.
Solution Approach 2:
The patent uses the underfill material as an intermediary to establish electrical connection between the conformal conductive coating on the die and the ground plane on the substrate. The underfill material contains conductive elements that bridge the gap, providing a reliable electrical pathway while also serving its mechanical and structural functions.
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 solution effectively shields RF devices from electromagnetic interference, enhancing their performance by providing comprehensive coverage and maintaining a compact form factor, suitable for integration in wireless devices.
Implementation Method 1
a conformal conductive coating implemented over the die to provide shielding functionality
Implementation Method 2
The ceramic substrate includes a conductive layer in electrical contact with a ground plane
Data Source
AI summary
Devices and methods related to packaging of radio-frequency (RF) devices on ceramic substrates. In some embodiments, a packaged electronic device can include a ceramic substrate configured to receive one or more components. The ceramic substrate can include a conductive layer in electrical contact with a ground plane. The packaged electronic device can further include a die having an integrated circuit and mounted on a surface of the ceramic substrate. The packaged electronic device can further include a conformal conductive coating implemented over the die to provide shielding functionality. The packaged electronic device can further include an electrical connection between the conformal conductive coating and the conductive layer.