返波体对混响室内场均匀性的影响

Influence of reflectors on field uniformity in reverberation chamber

以带有返波结构的混响室为基础,研究了在复杂腔体内部返波结构的改变对场分布的影响效果。根据微波混沌理论分析了不规则腔内的场分布特征;结合统计电磁学,确立了在高功率微波短脉冲激励下的混响室中进行场均匀性和各向同性验证的指标;对复杂腔体中返波体的大小、数量及分布范围等因素进行了研究。数值模拟结果显示:凸起结构的尺寸越大,其对腔内电场的影响效果越为明显,尤其是腔内电场分布的统计均匀性和各向同性结果,都能得到很好的改善。同时凸起结构越多,分布的范围越广,腔内电场的统计均匀性和能流的统计均衡性就越好。

In the case of the reverberation chamber （RC） with reflectors in it, the effect of the change of the reflectors on the characteristics of the field in RC is researched. On the basis of the microwave chaotic theory, the distribution of the field in unregular cavities is studied. Then the methods to judge the field uniformity and isotropy in the RC are established according to the statistical electromagnetics. The influences of the size, the number and the distribution of the reflectors in the RC on the field uniformity are studied. Simulation results show that the bigger the reflector is, the greater the influence on the field will be. The uniformity and isotropy are both improved as a result. Moreover, increasing the number and enlarging the range of the reflectors are helpful to decrease the standard deviation of the field, which means the improvement of the uniformity of the field and the har- monieity of the energy.