Single-Layer Trunk Routing Using 45-Degree Lines within Critical Areas for PCB Routing

In recent Printed Circuit Boards (PCB), the design size and density have increased, and the improvement of routing tools for PCB is required. Although there are several routing tools that generate high-quality global routings when only horizontal and vertical segments are used, PCB designers are not satisfied with these tools because high-density PCBs require segments that have arbitrary directions. In this paper, we propose a routing method that maintains the advantages of tools that use horizontal and vertical segments only, while handling higher density designs by using 45-degree segments to locally relax the routing density.