Application of Micro Genetic Algorithm to Optimization of Time-Domain Ultra-Wide Band Antenna Array

The application of antenna array is an effective way to improve the gain and directivity of ultra-wide band (UWB) antenna and reduce the side lobe. It is different from the traditional narrowband antenna based on frequency domain that the finite-difference time-domain method (FDTD) was used to make simulated analysis of a UWB TEM horn antenna in time domain. According to the principle of superposition, the information of time-domain radiated field of a 9-elements linear TEM horn array was then acquired and the universal characteristic of time-domain UWB antenna array was discussed. Combined with micro genetic algorithm (MGA), the energy pattern of linear array is optimized and a narrow beam-width is available, while the maximal side-lobe level of the array is limited.