Integrated Package Antenna Layout for Low-Dielectric Signal Launch
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Solution Overview
Problem
Incorporating antennas into microelectronic device packages is challenging due to interference from dielectric materials with high dielectric constants, which requires additional costly components and substantial area, such as printed circuit boards, to maintain antenna efficiency.
Innovation Solution
Integrating antennas directly into microelectronic device packages by mounting a semiconductor die to a package substrate with bond wires and a mold compound that exposes a portion of the antenna, allowing efficient electromagnetic signal launch and detection without the need for external circuit boards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If antennas are placed on printed circuit boards or organic substrates spaced from semiconductor devices, then antenna efficiency is maintained, but device complexity and cost increase due to additional expensive circuit board substrates and substantial area requirements
Solution Approach 1:
The patent combines the antenna structure with the package substrate, integrating two previously separate components (antenna and package substrate) into a single unified structure. This merging eliminates the need for separate printed circuit boards while maintaining antenna efficiency through careful design of the conductive trace layout on the package substrate.
Solution Approach 2:
The package substrate is designed to serve dual functions: as the mechanical support structure for the semiconductor device and as the antenna element for wireless communication. This multi-functionality reduces overall device complexity by eliminating dedicated antenna components and their associated mounting structures.
2Reliability
If antennas are placed on printed circuit boards or organic substrates spaced from semiconductor devices, then antenna efficiency is maintained, but manufacturing cost increases due to expensive circuit board substrates
Solution Approach 1:
By merging the antenna function into the package substrate, the patent eliminates the need for separate expensive circuit board substrates. The package substrate itself becomes the antenna element, reducing material costs and simplifying the bill of materials.
Solution Approach 2:
The package substrate performs multiple functions including mechanical support, electrical connection, and antenna operation. This multi-functionality reduces the need for additional expensive components, thereby lowering overall manufacturing costs while maintaining antenna efficiency.
3Reliability
If antennas are placed on printed circuit boards or organic substrates spaced from semiconductor devices, then antenna efficiency is maintained, but device area increases due to substantial space requirements
Solution Approach 1:
The patent merges the antenna structure with the package substrate, allowing the antenna to occupy the same spatial footprint as the package substrate rather than requiring additional space. This integration significantly reduces the overall device area while maintaining antenna efficiency through optimized trace design.
4Device complexity
If mold compound covers the semiconductor die and bond wires, then device protection and integration are improved, but antenna efficiency may be reduced due to high dielectric constant materials
Solution Approach 1:
The patent applies local quality by creating regions with different dielectric properties: the mold compound covers most areas for protection, but specific regions around the antenna conductive traces are left exposed or use low-dielectric-constant materials. This localized differentiation maintains antenna efficiency in critical areas while preserving the protective benefits of mold compound elsewhere.
Solution Approach 2:
The patent introduces air or low-dielectric-constant material as an intermediary between the high-dielectric-constant mold compound and the antenna conductive traces. This intermediary layer reduces the harmful dielectric effect on antenna performance while allowing the mold compound to provide protection in other areas.
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 enables efficient antenna operation within microelectronic device packages, reducing costs and area requirements while maintaining antenna performance for frequencies up to 300 GHz, suitable for applications like 5G and automotive radar.
Implementation Method 1
efficient antenna operation within microelectronic device packages, reducing costs and area requirements while maintaining antenna performance for frequencies up to 300 GHz
Data Source
AI summary
A described example includes: a semiconductor die mounted to a die pad of a package substrate, the semiconductor die having bond pads on a device side surface facing away from the die pad; bond wires coupling the bond pads of the semiconductor die to leads of the package substrate, the leads spaced from the die pad; an antenna positioned over the device side surface of the semiconductor die and having a feed line coupled between the antenna and a device side surface of the semiconductor die; and mold compound covering the semiconductor die, the bond wires, a portion of the leads, and the die side surface of the die pad, a portion of the antenna exposed from the mold compound.