Multilayer Package Antenna Layout for Crosstalk Isolation
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Solution Overview
Problem
Current microelectronic device packages face challenges in efficiently integrating antennas due to high dielectric constants of mold compounds and substrate materials, which interfere with antenna efficiency, often requiring separate printed circuit boards, increasing cost and device area.
Innovation Solution
A multilayer package substrate with patterned conductive and dielectric portions, including antennas formed in a conductive layer, a reflector, isolation walls, and lateral reflection walls, allows for the integration of antennas within the package substrate, spaced from the semiconductor die, enhancing transmission efficiency and reducing crosstalk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If antennas are integrated within the package substrate, then device area and cost are reduced, but antenna efficiency deteriorates due to high dielectric constants of mold compounds and substrate materials
Solution Approach 1:
The package substrate is divided into multiple layers with different dielectric properties. The first antenna is formed in a first substrate layer with a first dielectric constant, while the second antenna is formed in a second substrate layer with a second dielectric constant that is lower than the first dielectric constant. This segmentation allows each antenna to operate in an optimized dielectric environment, improving overall antenna efficiency while maintaining compact integration within the package substrate.
Solution Approach 2:
Different regions of the package substrate are assigned different dielectric constants to optimize local antenna performance. The second substrate layer is specifically designed with a lower dielectric constant to provide a more favorable environment for the second antenna, while the first substrate layer maintains its original dielectric properties for the first antenna. This local quality variation resolves the contradiction by creating antenna-specific optimized zones within the integrated package structure.
2Area of stationary object
If multiple antennas are placed close to the semiconductor die, then device area is reduced, but crosstalk between antennas increases
Solution Approach 1:
The patent utilizes the vertical dimension by forming antennas in different substrate layers. The first antenna is formed in a first substrate layer while the second antenna is formed in a second substrate layer, creating vertical separation between the antennas. This dimensional approach allows multiple antennas to be integrated in a compact footprint while maintaining sufficient spacing to reduce crosstalk, effectively resolving the contradiction between area reduction and crosstalk mitigation.
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 cost-effective and efficient integration of antennas within microelectronic device packages, improving transmission efficiency and reducing crosstalk, while eliminating the need for additional circuit boards, thus optimizing space and reducing costs.
Implementation Method 1
a reflector formed in a fourth layer of the multilayer package substrate
Implementation Method 2
an isolation wall formed in the multilayer package substrate formed in at least a second and a third layer in the multilayer package substrate
Implementation Method 3
first lateral reflection walls extending from the top ground layer to the reflector, the first lateral reflection walls surrounding the first antenna
Data Source
AI summary
Described examples include an apparatus having a first antenna and a second antenna formed in a first layer on a first surface of a multilayer package substrate, the multilayer package substrate having layers including patterned conductive portions and dielectric portions, the multilayer package substrate having a second surface opposite the first surface. The apparatus also has an isolation wall formed in the multilayer package substrate formed in at least a second and a third layer in the multilayer package substrate and a semiconductor die mounted to the first surface of the multilayer package substrate spaced from and coupled to the first antenna and the second antenna.