Near-field analysis and field transformation applied to a parabolic profile at 5 GHz

We propose a method of near-field analysis and field transformation that is applied to a 1.5 m diameter parabolic reflector at a frequency of 5 GHz. An antenna of such dimensions requires at least a 75 m region to obtain its radiation pattern, and this represents a problem, here arises the necessity to make field transformations like the one presented in this work. Near field is modeled by means of Finite Difference Time Domain Method (FDTD) and current distribution is obtained using the discrete Pocklington equation. Radiation pattern is calculated applying the array factor for parabolic profiles. Results are compared with those obtained by CST Microwave Studio with a very good agreement.