2] This generalization was obtained before by J. A. Kong, "Reciprocity relationships for bianisotropic media," Proc. I€€€ (Lett.), vol. 58, pp. 1966-[3] A. A. M. Saleh "Conservation relation for lossless 1967, a This definition of stored energy agrees with previexample, [an.

The field of a perfectly conducting, infinitely long, cylindrical antenna with a slice generator excited by a step-function voltage wave form is computed at several positions in space. For field points remote from the source, analytical simplifications are possible, and the case where the antenna is loaded with uniform resistance can then be treated. A simple formula for determining the generator voltage wave form required to radiate a specified far-field wave form is derived.

No abstract

A method is developed for calculating the electromagnetic fiela scattered by certain types of bodies . The bodies consist of inhomog eneous media whose constitutive parameters vary only with the aistance from some axis or point of symmetry. The method consists in a n extension of the invariant imbedding method for treating wave p roblems. This method, which is familiar in the case of a onedimensional inhomogeneity, is extended to handle special types of two and three-dimensional inhomogeneities. Comparisons are made with other methods which have been proposed for treating these kinds of problems . Examples of applications of the method are given, some of which are of interest in themselves.

Various conditions near the end of a semi-infinite, perfectly conducting pipe with a perfectly conducting flange are critically examined with regard to their effects on the interior field when the pipe is exposed to a low-frequency magnetic field. This is accomplished by solving several pertinent boundary-value problems. The results of this investigation indicate that (1) the effect of removing the flange is about 34 %,(2) the effect of inserting a resistive cap is to yield a "shielding ratio" similar to that in other low-frequency shielding problems, and (3) the effect of an extremely narrow annular slot in an otherwise perfectly conducting cap is surprisingly large.