Mutual Impedance of Two Skew Antenna Wires

In a recent communication P. S. Carter derived a formula for the mutual impedance of two antenna wires intersecting at an angle θ, as a sum of two definite integrals. It has been shown that related double integrals can be reduced to sums of logarithmic integrals and their limits; in the present paper this reduction will be generalized. The mutual impedance of two antenna wires in space which do not intersect may be calculated in terms of the integrals discussed, but these integrals can be evaluated by known tables only if the wires are in the same plane. The integrals of Carter result from a suitable limiting operation; a direct evaluation is also possible and is given.