On the measured equation of invariance for an electrically large cylinder

By considering the electromagnetic scattering of a circular conducting cylinder, the accuracy of the measured equation of invariance (MEI) is examined analytically. Using the asymptotic expansions of the Hankel's functions of second kind, H/sub n//sup (2)/(k/spl rho/) as measuring functions, the case of an electrically large cylinder is studied. It is shown that the MEI coefficients are invariant to the field of excitation.