Microwave Impedance Measurements with Application to Antennas. I

Abstract

The problem of impedance measurement at centimeter wave-lengths is discussed with special reference to the practical aspects. The description of the various transmission-line methods available is supplemented by a detailed account of the apparatus and procedure used to determine the input impedance of a symmetrical antenna.

A delta gap source for locally corrected Nyström discretized integral equations

“…Some early discussions of the delta gap source are given by King and King [1] and Schelkunoff [2] where it was applied to thin-wire analysis. Due to the gap capacitance, whose principle function according to Schelkunoff is to "distress applied mathematicians" [3], and due to the fact that the delta function is not in the range of the electric field integral equation (EFIE) operator [4], the current does not converge in the source region under mesh refinement.…”