Metaconductor Based Highly Energy Efficient Differential Striplines for 112 Gbps Data Bus With Sub 0.1 dB/mm Package Insertion Loss

We present a differential stripline with an insertion loss of less than 0.1 dB/mm at 28 GHz based on Copper/Cobalt-metaconductor (Cu/Co-MC). This work will benefit highperformance networking devices for data center applications with 112 Gbps data rates. The design is modeled in High-Frequency Structure Simulator (HFSS, ANSYS, Inc.). The differential stripline has been designed on a low loss dielectric material with a dielectric loss tangent (tan δ) of 0.0065, a dielectric constant (D
k
) of 3.33, and a surface roughness of 75 nm. The differential pair ports are excited in 95 Ohm characteristic impedance. The Cu/Co- MC scalability analysis has been performed from 5 to 20 pairs Cu/Co-MCs and the results are compared to those of solid Cu counterparts. 10 + pairs of Cu/Co-MC layers show an insertion loss (IL) of below 0.1 dB/mm at 28 GHz, while solid Cu counterparts do not meet the 0.1 dB/mm goal. The proposed Cu/Co-MC based differential stripline architecture enables to establish a foundation toward future 800 G Ethernet applications.