Mold-Patterned RF Package Antennas for Bandwidth and Thermal Control
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Solution Overview
Problem
Existing wireless communication technologies face challenges in integrating antennas and substrates co-located on the same package to reduce substrate path losses at high frequencies, especially in millimeter wave frequencies, and thermal dissipation issues with power amplifiers embedded in substrates.
Innovation Solution
A new packaging architecture integrates stacked patch antennas with mold patterning, using a dielectric mold compound to couple antennas capacitively, enabling thermal management and wide bandwidth, and incorporates mold materials that are lower cost than traditional package substrates, allowing for selective die shielding and antenna implementation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If stacked patch antennas are integrated vertically through single package or multiple packages, then bandwidth is enhanced, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent combines the antenna substrate and device package into a single integrated structure, eliminating the need for separate antenna packages or complex vertical stacking. The package substrate itself serves as the antenna mounting platform, merging two previously separate functions into one unified component that achieves bandwidth enhancement without increased complexity
Solution Approach 2:
The package substrate is designed to serve multiple functions simultaneously: it provides mechanical support for the radio die, enables thermal dissipation through its structure, and serves as the mounting platform for stacked patch antennas. This multi-functionality eliminates the need for separate antenna substrates or additional packaging layers
2Device complexity
If power amplifiers are embedded inside the substrate, then integration is improved, but thermal dissipation becomes difficult to manage
Solution Approach 1:
The patent extracts the power amplifier from the substrate embedding approach and positions it on the antenna substrate instead. This extraction allows the amplifier to be integrated into the overall package structure while maintaining access to external thermal management solutions, avoiding the thermal confinement that would result from embedding it within the substrate
3Loss of energy
If antenna and substrate are co-located on the same package, then substrate path losses are reduced, but thermal management complexity increases
Solution Approach 1:
The patent applies local quality by creating regions of different thermal conductivity within the package substrate. High thermal conductivity materials are used in specific areas where heat generation occurs (such as near the radio die), while other regions maintain standard properties for optimal RF performance. This localized approach reduces thermal management complexity while maintaining low substrate path losses
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 achieves up to 2× bandwidth improvement and effective thermal management, suitable for small form factor devices, while reducing substrate path losses and thermal dissipation, supporting high-frequency operations like 5G and WiGig.
Implementation Method 1
A mold material includes a first region that is positioned between the first conductive layer and a second conductive layer of the antenna unit with the mold material being a dielectric material to capacitively couple the first and second conductive layers of the antenna unit
Data Source
AI summary
Embodiments of the invention include a microelectronic device that includes a first substrate having radio frequency (RF) components and a second substrate that is coupled to the first substrate. The second substrate includes a first conductive layer of an antenna unit for transmitting and receiving communications at a frequency of approximately 4 GHz or higher. A mold material is disposed on the first and second substrates. The mold material includes a first region that is positioned between the first conductive layer and a second conductive layer of the antenna unit with the mold material being a dielectric material to capacitively couple the first and second conductive layers of the antenna unit.