RF Signal Port Shielding in Semiconductor Packages for Channel Isolation
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Solution Overview
Problem
In radio frequency applications, such as radar systems, the increasing number of functions packed into small components leads to signal interferences and degradation of signal-to-signal isolation between radar frequency channels, necessitating improved isolation properties between individual channels.
Innovation Solution
A semiconductor package with a shielding structure at least partially surrounding the signal port, configured to reduce interference signal propagation, utilizing electrically conductive materials or semiconductor materials with trenches filled with encapsulation material, to provide electrical shielding between neighboring signal ports.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If more functions are packed into small components, then device functionality increases, but signal interference and degradation of signal-to-signal isolation between radar frequency channels occurs
Solution Approach 1:
A shielding structure made of electrically conductive material is introduced as an intermediary element between neighboring signal ports. This shielding structure acts as a mediator that blocks electromagnetic fields and interference signals from propagating between adjacent signal ports, thereby resolving the signal interference problem caused by high-functionality integration in compact packages.
2Area of stationary object
If signal ports are arranged in close proximity to increase integration density, then device compactness improves, but electromagnetic wave guidance and crosstalk between neighboring signal ports increases
Solution Approach 1:
The shielding structure serves as a physical intermediary barrier positioned between closely spaced signal ports. It prevents electromagnetic waves generated by one signal port from being guided to neighboring signal ports, thereby eliminating crosstalk while maintaining the compact package design with high integration density.
3Reliability
If a shielding structure is added to reduce interference, then signal isolation improves, but device complexity increases
Solution Approach 1:
The shielding structure is implemented as a thin film or shell made of electrically conductive material that can conform to the package geometry. This approach provides effective signal isolation and interference protection while minimizing the increase in device complexity, as the thin-film shielding can be integrated into the existing package structure without adding significant bulk or structural complexity.
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 shielding structure effectively improves the isolation performance of the semiconductor package by reducing interference and crosstalk between radio frequency channels, enhancing signal integrity and reducing electromagnetic wave guidance in the x-y plane.
Implementation Method 1
a shielding structure at least partially surrounding the signal port when viewed in a first direction, wherein the shielding structure is configured to reduce a propagation of an interference signal from and/or to the signal port
Data Source
AI summary
A semiconductor package includes a semiconductor chip including multiple radio frequency channels. The semiconductor package further includes a signal port arranged external to the semiconductor chip and associated with one of the multiple radio frequency channels. The semiconductor package further includes a shielding structure at least partially surrounding the signal port when viewed in a first direction, wherein the shielding structure is configured to reduce a propagation of an interference signal from and/or to the signal port in a second direction perpendicular to the first direction.