用于认知无线电的自适应可重构天线研究

针对未来无线电系统如软件无线电、认知无线电给天线设计特别是可重构天线设计提出的新挑战，提出了一种基于全波/网络混合的可重构天线仿真分析方法.该方法将可重构天线看作多载天线，采用全波仿真分析无加载的天线阵列，将网络分析法与遗传算法相结合分析任意加载可重构天线的网络特性和辐射方向图，并利用该方法对一种矩形环形可重构天线的频率和方向图可重构能力进行了仿真分析.仿真结果表明，矩形环形可重构天线具有频率可重构和方向图可重构的功能，该特性可以使其应用于未来的认知无线电、智能天线等系统中.

Adaptive reconfigurable antenna for cognitive radio

Future radio systems，such as software defined radio and cognitive radio have posed a significant challenge to antenna design，particularly reconfigurable antenna design.The paper presents a simulation method of the reconfigurable antennas，in which the fullwave simulation is adopted for the unloaded array，while network analysis is used along with genetic algorithm to search for network characteristics and radiation patterns of arbitrary loading arrays.Using this method，a square ring reconfigurable antenna is simulated to find the reconfigurablity of frequency and radiation patterns.The simulation result shows that the reconfigurable antenna concerned in the paper has frequency reconfigurablity and pattern reconfigurablity，making it a promising application in the future cognitive radio and smart antennas.