Self- and Mutual Impedances of Parallel Identical Antennas

A method is described for obtaining approximate second-order self- and mutual impedances of parallel identical antennas. Extensive groups of curves of the newly determined impedances are provided. Since they lead to the second-order King-Middleton impedances for isolated antennas at infinite separation, and these are known to be in excellent agreement with experimental measurements, they are necessarily more accurate than the first-order or zeroth-order values thus far available, which do not lead to experimentally verifiable impedances at infinite separation except for extremely thin antennas.