A Comparative Analysis of Two Dielectric Extraction Methods of a PCB Material for D-Band Applications

In this paper, the dielectric properties of a PCB material are extracted at D-band frequency using two different methods, namely: planar microstrip fork-coupled resonator and fabry-pérot resonator. A comparative analysis of these two dielectric extraction methods is carried out by measuring and characterising Astra-MT77 material at 140 GHz and suitability of the material for D-band applications is evaluated. The dielectric properties extracted using fabry-pérot resonator are: dielectric constant, ϵr = 2.8 and loss tangent, tanδ = 0.0058. The metalized microstrip fork-coupled resonator method resulted in higher losses, tanδ = 0.0090 and dielectric constant, ϵr = 3.0 at 140 GHz.