Antenna Integration in Multilayer Package Substrates
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Solution Overview
Problem
Incorporating antennas into microelectronic device packages is challenging due to interference from mold compounds and substrate materials with high dielectric constants, which affects antenna efficiency and requires additional costly components like printed circuit boards.
Innovation Solution
A microelectronic device package with a multilayer substrate that integrates a patch antenna or E-patch antenna formed in a conductor layer, coupled with a reflector, allowing the semiconductor die to be mounted alongside the antenna, eliminating the need for separate antenna boards and reducing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If antennas are embedded in mold compounds or substrate materials with high dielectric constants, then antenna integration is achieved, but antenna efficiency deteriorates due to dielectric interference
Solution Approach 1:
The antenna is extracted from the high dielectric constant mold compound and placed on a separate low dielectric constant layer within the package substrate. This separation removes the antenna from the harmful high dielectric environment while maintaining integration within the package structure, thus preserving antenna efficiency while achieving integration.
Solution Approach 2:
A dedicated low dielectric constant layer is introduced as an intermediary between the antenna and the high dielectric constant mold compound. This intermediary layer protects the antenna from dielectric interference while allowing the antenna to remain integrated within the package substrate structure.
2Reliability
If separate printed circuit board substrates are used for antennas, then antenna efficiency is improved, but device cost and area increase
Solution Approach 1:
The antenna structure is merged with the package substrate by forming the antenna on a low dielectric constant layer that is part of the package substrate stack. This combining eliminates the need for separate PCB substrates while maintaining antenna efficiency through proper dielectric material selection.
Solution Approach 2:
The package substrate is designed to serve multiple functions: it provides mechanical support for the semiconductor device, contains the antenna structure on its surface, and provides electrical interconnections. This multi-functionality eliminates the need for separate antenna substrates while maintaining system performance.
3Reliability
If additional PCB substrates are used for antenna integration, then antenna performance is maintained, but manufacturing cost increases
Solution Approach 1:
The antenna fabrication process is merged with the package substrate manufacturing process. The antenna is formed on the package substrate using similar semiconductor fabrication techniques, allowing both components to be manufactured together in the same facility using compatible processes, thereby reducing overall manufacturing cost.
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 solution enables efficient and cost-effective integration of antennas within microelectronic device packages, improving antenna performance and reducing the need for additional components, thus enhancing the overall efficiency and cost-effectiveness of the packaging process.
Implementation Method 1
a reflector formed in another one of the conductor layers of the multilayer package substrate and spaced from the E-patch antenna by the dielectric material
Data Source
AI summary
In a described example, an apparatus includes: a patch antenna formed in a first conductor layer on a device side surface of a multilayer package substrate, the multilayer package substrate including conductor layers spaced from one another by dielectric material and coupled to one another by conductive vertical connection layers, the multilayer package substrate having a board side surface opposite the device side surface; and a semiconductor die mounted to the device side surface of the multilayer package substrate spaced from and coupled to the patch antenna.