Efficient Radiation Antenna Modeling via Orthogonal Matching Pursuit in Terms of Infinitesimal Dipoles

In this letter, the Orthogonal Matching Pursuit algorithm is introduced to model the radiation of antennas in terms of elementary sources. This algorithm, combined with the application of the Translational Addition Theorems of spherical waves, provides an accurate sparse approximation of the transmitting coefficients of spherical waves by placing a reduced set of infinitesimal dipoles in the antenna location. The efficiency of the proposed method is demonstrated by showing its capability to deal with electrically large antennas, the ease of implementation, and the computational efficiency. Numerical results are also presented for an array of cavity-backed patch antennas and a pyramidal horn antenna .