Production Of High Temperature Superconductor Thin Film Microstructures And Transmission Lines

Dielectric Loss Reduction In Superconducting Transmission Lines

“…Inverting and suspending the substrate induces wider lines, which have lower conductor loss. Inverted microstrip might allow the use of SrTiO^ substrates, where the high dielectric constant (300-1800) and high dielectric loss tangent (0.001 -0.02) [9] would not as severely affect the performance since the fields lie primarily in the air gap between the strip and the ground plane. For coplanar waveguide, etching or ion milling to introduce grooves into the dielectric substrate in the slot has been shown to reduce the conductor loss by rearranging the currents on the strips [10].…”