Use of the Integral E-Field Equation in Problems of Electromagnetic Wave Scattering by Reflector Antenna Systems in Resonant Frequency Range

The article considers examples where the method for radar scattering analysis of non-perfectly conducting open screens of finite thickness previously developed by the authors is applied to calculating the radiation performance characteristics of reflector antenna systems in resonant frequency range. The method is based on solution to the benchmark problem of electromagnetic field scattering at a well-conducting (yet non-perfectly conducting) screen of finite thickness. Solution to the benchmark problem provided by the authors is based on the integral E-field equation, which takes into account the approximate Leontovych boundary conditions at an impedance surface. The method employed here allowed us to take into account the real thickness and conductivity of open screens that model antenna reflectors. Two examples are considered where the method is put to use. The first example involves calculation of ultra-wideband (UWB) signals that would be radiated by a reflector antenna with a spherical reflector in time domain. Problems of this kind arise every time as the UWB pulse is to be emitted, the whole spectrum or part of the spectrum of which falls into the resonant frequency range with respect to antenna’s reflector. The second example involves computation of radiation patterns of dual-reflector antennas in the resonant frequency range. The results of computations pertaining to radiation performance of reflector antennas are presented with regard to the two examples mentioned above.