The Study on the Antenna Optimization

摘要

What is the optimal antenna? No one give a precise answer. In fact, some one optimize the antenna's parameters to get some best performance in some limited range based on experience model. In the further, some others divides a 2-D rectangular area into some grids, then the initial 2-D chromosome population is produced randomly. The size of population is the number of grids, "1" represents the metallized areas and "0" represents the areas without metal. But the fatal problem is that two diagonally metal grid connected at one point in simulation, and it maybe unclear in manufacturing, joint or not? Here a continuing method is presented to optimize microstrip antenna to try to overcome the shortcoming of those two method- experience model and random grids. Firstly, the procedure is divide into 2 steps: 1) Crude model is constructed based on the continuing rule- the second metal grid always connects the former one with one edge, so that the whole metal area is continuous. 2) Precise model optimization: The crude model is regularized by the surface currency, then it is described by some parameters, and optimize these main parameters to get the best performance of antenna in some range. A multiband antenna is optimized by this method, and the measured results is good.