The Effective Height of Closed Aerials

In this article formulas are given for the calculation of the effective height of coil aerials with non quasi stationary distribution of current. Aerials of triangular, rhombical, rectangular, and pentagonal forms, suitable for use in radio beacons, are treated, and the method of taking account of the distribution of current along the aerial found by experiment discussed. Graphs for facilitating numerical calculations using the formulas are given, together with examples illustrating their use. Special attention is given to the determination of those forms of aerials in which the wire is most advantageously placed for obtaining a maximum of effective height.