INVESTIGATION OF RETURN LOSS FOR LARGE NUMBERS OF BONDING WIRES BY FDTD METHOD

摘要

The finite-difference time domain (FDTD) model is validated first by comparing the simulation results of return losses for 1, 7, and 15 bonding wires fabricated on a test board with those obtained by the HFSS software. After checking its accuracy, the FDTD method is used to investigate the return loss for bonding wire arrays with numerous geometrical parameters. From simulation results, it is found that the return loss of bonding wires can be improved by using multiple wires placed in parallel in bonding wire arrays. It is also found that operation frequency shifts of bonding wire arrays can be achieved by changing the wire numbers in bonding wire arrays. It is also reveled that the return loss of bonding wire structures is a function of the bonding wire geometry, such as the spacing between adjacent wires, wire number, wire height above the substrate, and wire length.