The Application of Stationary Phase to Radio Propagation for Finite Limits of Integration


  • H. T. Dougherty


The application of the stationary phase method is investigated for a dimensionless line integral encountered in wave propagation. Evaluation of the integral for a first-order point of stationary phase may be expressed, characteristically, by the Fresnel-Kirchhoff function or its derivative. A related function is found for the isolation factor required for finite limits of integration. Curves for evaluating this factor, K(u2 u1), are presented.