Effective Dielectric Constant Benchmark of 60 GHz Liquid Crystal-Filled Coaxial Delay Line

Gaining exact knowledge of the effective permittivity for liquid crystal-filled delay lines (LCF-DL) is fundamental to the precise prediction of the variable time-delaying functionality. This work semi-theoretically and computationally benchmarked the above quantities for a coaxially structured LCF-DL that operates at 60 GHz. Decent agreement of the computed effective permittivity of the delay line with the intrinsic dielectric constant of the filler material is observed, with a deviation less than 0.0045 maximally for the filler thickness between 0.2 mm and 0.5 mm. The numerically validated nearly-perfectly-true transverse electromagnetic nature of the proposed coaxial LCF-DL at the V band provides useful implications for future devices' quick prototyping without capital-intensive full-wave simulators.