ON THE COMPUTATION OF INFELDS FUNCTION USED IN EVALUATING THE ADMITTANCE OF PROLATE SPHEROIDAL DIPOLE ANTENNAS

The Infeld function expressed in terms of the outgoing prolate spheroi dal radial wave function and its derivative, and employed in the expre ssion of the input self-admittance of prolate spheroidal antennas, has accurately been calculated by using a newly developed asymptotic expr ession for large degree n. This asymptotic power series has been deriv ed by using a perturbation method with a perturbation parameter epsilo n = 1/(lambda(1n) - h(2)), where lambda(1n) is the spheroid's eigenval ue for the given parameter h of the spheroidal wave function.