Efficient Calculations of Antenna Radiation Patterns Using the Fast Fourier Transform

摘要

Time-efficient calculations of radiated electromagnetic fields are desirable in many antenna applications. The specific problem analyzed in this paper concerns the development of antenna radomes. To find the optimal configuration, a large number of simulations of virtual antennas with small changes are required. A fast and reliable calculation method is needed for such simulations.In this paper we study the possibility to calculate the far-field with the Discrete Fourier Transform, which enables usage of the Fast Fourier Transform algorithm. An accurate and unique representation of the far-field with this method requires special attention of the sampling interval of the current distribution.Our experience is that this Fourier method is about one thousand times faster than standard practise in industry.