microstrip analysis (calculates Z,eff from w/h)
[eff,Z] = mstripa(er,u)
relative permittivity of substrate
width-to-height ratio = w/h
effective permittivity
characteristic impedance of line
mstripa(er,u) performs microstrip analysis (calculates Z,eff from w/h)
velocity factor = 1/sqrt(eff) can calculate a vector of Z's and eff's from a vector of u's. uses Hammerstad and Jensen emprical formulas. accuracy is better than 0.2% over u=(0.01,100) and er less than 128
add sample pgm