r_ring 8.5[mm] "Radius, microstrip line ring"
w_subs 30[mm] "Width, substrate"
l_subs 26[mm] "Length, substrate"
r_inner 0.635[mm] "Radius, coax inner"
r_outer 2.05[mm] "Radius, coax outer"
l_sma 8[mm] "Length, SMA"