Design equations for coupled microstrip lines

Abstract

Closed form capacitance expressions for the even and odd mode characteristics of coupled microstrip lines are presented. These expressions are accurate to within 3% for 0.2≤W/h≤2, 0.05≤S/h≤2 and ϵ_rl. Extension of these results to asvmmetriu coupled microstrip lines indicate an accuracy of about 5% for ϵ = 10, W/h = 0.95, W₂/h≥0.2and S/h≥0.1