Coax via-A technique to reduce crosstalk and enhance impedance match at vias in high-frequency multilayer packages verified by FDTD and MoM modeling

Large-scale crosstalk at vias and poor via electrical performance are major drawbacks in state-of-the-art high-frequency multilayer first- or second-level integrated-circuit/monolithic-microwave integrated-circuit (IC/MMIC) packages. The coax via design modeled in this paper breaks new ground in achieving more than 30-dB ultrawide-band crosstalk reduction and providing an enhanced impedance match.