关键词: 宽带通信系统, 互耦, 系统容量, 多输入多输出

Abstract: In this paper，the impact of mutual coupling on multiple-input multiple-output（MIMO） communications capacity is studied in broadband communication system.First of all，mutual coupling between antenna arrays is analyzed，and the capacity of broadband communication system with mutual coupling is derived.Then through Monte Carlo method，system capacity are simulated under different antenna array configuration.The results show that when the antenna arrays become too close，the correlation of antenna array can be improved for mutual coupling effect，and consequently increase system capacity.The more antennae，the more the capacity increases.And this conclusion gives some guidelines for antenna design in broadband MIMO communication system.

Key words: broadband communication system, mutual coupling, system capacity, multiple-input multiple-output（MIMO）