Coupled IE-PO method for analysis of antenna radiation patterns in the presence of a large 3D radome

A method based on integral equation (IE) coupled with physical optics (PO) method is proposed for the analysis of antennas in the presence of a large three-dimensional (3D) dielectric radome. The electric field integral equation (EFIE) is applied to the conducting surfaces of the antenna/array enclosed within a large 3D radome. Equivalent PO surface currents are assumed on the radome walls, induced by the near field radiation of the antenna. The PO currents are coupled back into the integral equation to account for the effects of the radome on the antenna. The resultant current distribution on the antenna obtained by this coupled IE-PO method is useful for computation of the antenna's input impedance and radiation patterns with the effect of radome. As PO method is applied to the large radome, no additional unknowns are needed, besides those defined on the surface of the antenna, leading to a substantial reduction in computational resources required. Numerical simulation showing the accuracy and efficiency of the coupled IE-PO method will be presented.