Multilayer PCB Filling Segment Structures for Warpage Control
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Solution Overview
Problem
Multilayer printed circuit boards (PCBs) face challenges in achieving higher circuit densities, finer trace widths, and reduced interconnect lengths while maintaining optimal metal density and avoiding design perturbations such as warpage and RF circuit performance issues.
Innovation Solution
The implementation of filling segment structures in metallization layers, which are small metal structures arranged in a repeating pattern to achieve a metal density of at least 35%, thereby eliminating the need for degassing holes and minimizing disturbances to circuit performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional metallization layers are used to achieve high circuit density, then circuit density improves, but metal density becomes insufficient leading to warpage and manufacturing issues
Solution Approach 1:
The patent divides the metallization layer into multiple segments by inserting insulating material between metal traces. This segmentation allows the same physical space to contain both high circuit density (more traces per area) and sufficient metal density (enough continuous metal for manufacturing stability), resolving the contradiction between these two parameters.
2Quantity of substance
If degassing holes are added to achieve required metal density, then metal density improves, but circuit performance deteriorates due to disturbances
Solution Approach 1:
The patent introduces an insulating material as an intermediary substance between metal traces instead of creating degassing holes. This insulating material fills the spaces between segmented metal traces, achieving the required metal density and preventing manufacturing defects without introducing holes that would disturb RF circuit performance.
3Stability of the object's composition
If metal density is increased to prevent warpage, then manufacturing stability improves, but circuit geometry flexibility deteriorates
Solution Approach 1:
By segmenting the metallization layer with insulating material, the patent achieves high metal density for manufacturing stability while maintaining the ability to create fine trace widths and complex circuit geometries. The segmented structure allows metal traces to be closely spaced without requiring large solid metal areas, thus preserving circuit geometry flexibility.
Data Source
AI summary
Multilayer printed circuit boards are provided. In one example, a multilayer printed circuit board includes at least one metallization layer. The multilayer printed circuit board includes an insulating layer. The multilayer printed circuit board includes an insulating layer. The at least one metallization layer includes a plurality of filling segment structures such that the at least one metallization layer has a metal density of at least about 35%.