Mutual admittance of two collinear antennas

摘要

An asymptotic theory for the admittance of two collinear antennas is developed. The antennas can be of unequal lengths, and the feedpoint locations are practically arbitrary. The only restrictions are that the radii must be equal and small; while the smallest feedpoint‐end distance and the separation between the antenna ends must be fairly large [i.e., (2π/λ) (distance) ≫ 1, roughly]. The expressions obtained for the self‐admittance and mutual admittance are in closed form and contain only elementary or known functions. Where comparison is possible, the results agree with previous theories. A few curves showing the effect of varying different parameters are presented, while some general conclusions about the behavior of the mutual admittance are drawn.