1. A printed circuit board (PCB), comprising:a substrate;
first and second microstrip conductors located on a surface of the substrate;
a solder mask covering the surface of the substrate and the first and second microstrip conductors; and
a dielectric coating disposed on the solder mask, on an opposite side of the solder mask from the first and second microstrip conductors, wherein a thickness of the dielectric coating is selected to provide a ratio of capacitive coupling to self capacitance for each of the first and second microstrip conductors to be approximately equal, within 25%, to a ratio of inductive coupling to self inductance for each of the first and second microstrip conductors.