Admittance of Coaxially Driven Infinite Monopole

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Abstract
The apparent admittance of a coaxially driven infinite monopole is reexamined. Systematic procedures are found to derive the higher‐order terms. The first‐order terms for both the exact admittance Ya∞ and the approximate admittance YTEM∞ are shown to vanish. The slope of (Ya∞ ‐ YTEM∞) with respect to (b/a‐1) is therefore zero as b/a→1. This information is important to bridge the heretofore little understood region between (i) the exactly known limiting value for b/a=1 and (ii) the values for b/a>1 which can be calculated numerically.

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