Dielectric-Filled Silicon RF Substrate for Low-Loss Antenna Integration
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Solution Overview
Problem
Conventional semiconductor materials used in RF antenna systems for wireless devices suffer from high electromagnetic energy dissipation, leading to reduced radiation efficiency and limited bandwidth, especially in high-frequency applications.
Innovation Solution
The development of a package assembly with a structured silicon substrate featuring cavities filled with dielectric material and RF elements embedded within an insulating layer, which reduces signal loss by isolating RF components from the lossy substrate, enhancing radiation efficiency and bandwidth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If conventional semiconductor materials (silicon substrates) are used for RF antenna systems, then device integration and miniaturization are achieved, but electromagnetic energy dissipation increases, reducing radiation efficiency and bandwidth
Solution Approach 1:
The substrate is segmented into distinct regions: lossy silicon substrate regions for device integration and low-loss dielectric-filled cavity regions for RF antenna operation. This segmentation allows each region to perform its optimal function - the silicon substrate provides integration capability while the dielectric-filled cavities minimize electromagnetic energy dissipation.
Solution Approach 2:
Dielectric material acts as an intermediary between the lossy silicon substrate and the RF antenna elements. The dielectric-filled cavities serve as intermediate structures that isolate the RF elements from the lossy substrate, reducing electromagnetic energy dissipation while maintaining device integration.
2Productivity
If RF elements are placed close to semiconductor devices for miniaturization, then device density increases, but signal loss increases due to the lossy nature of conventional semiconductor materials
Solution Approach 1:
The package assembly is segmented into device regions (on silicon substrate) and RF element regions (in dielectric-filled cavities). This spatial segmentation enables high device integration density while isolating RF elements from the lossy substrate, thereby maintaining signal integrity.
Solution Approach 2:
Different regions of the package assembly have different material properties: the silicon substrate regions provide high integration density, while the dielectric-filled cavity regions provide low loss characteristics. This local differentiation of material quality allows simultaneous achievement of high integration density and low signal loss.
3Ease of manufacture
If conventional semiconductor materials are used for high frequency applications, then manufacturing simplicity is maintained, but radiation efficiency and bandwidth are limited
Solution Approach 1:
The package assembly uses composite material structures combining silicon substrate, dielectric materials (such as PTFE, polyimide, or ceramic), and conductive materials. This composite approach maintains manufacturing simplicity through established semiconductor packaging processes while achieving superior radiation efficiency and bandwidth performance.
Solution Approach 2:
The material parameters (dielectric constant, loss tangent) are changed by introducing dielectric-filled cavities rather than using uniform conventional semiconductor materials. This parameter change enables high radiation efficiency and bandwidth while maintaining compatibility with existing manufacturing processes.
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 approach improves radiation efficiency and bandwidth by minimizing signal loss through the use of dielectric-filled cavities and embedded RF elements, supporting high-frequency applications in compact wireless devices.
Implementation Method 1
an insulating layer disposed over the first surface, the second surface, the first cavity wall, and the via wall; an electrical interconnection disposed within the via, wherein the insulating layer is disposed between the via wall and the electrical interconnection
Implementation Method 2
a first cavity comprising a first cavity wall; a radio frequency (RF) element disposed over the first cavity
Data Source
AI summary
The present disclosure relates to methods and apparatus for forming thin-form-factor reconstituted substrates and semiconductor device packages for radio frequency applications. The substrate and package structures described herein may be utilized in high-density 2D and 3D integrated devices for 4G, 5G, 6G, and other wireless network systems. In one embodiment, a silicon substrate is structured by laser ablation to include cavities for placement of semiconductor dies and vias for deposition of conductive interconnections. Additionally, one or more cavities are structured to be filled or occupied with a flowable dielectric material. Integration of one or more radio frequency components adjacent the dielectric-filled cavities enables improved performance of the radio frequency elements with reduced signal loss caused by the silicon substrate.