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为实现混响室(RC)品质因子Q的科学评估、研究混响室腔体加载物对Q的影响,分析了腔室内能量的耗散途径。将加载物等效为一系列能够吸收反射电磁能量的球形介质,通过计算介质球吸收截面,给出了Q的表达式,并建立混响室模型对Q进行数值计算。研究了Q与加载物材料、尺寸的关系。结果表明,当频率>1.2 GHz时,Q的计算结果与实际测量结果相符;Q与加载物吸收截面成反比,与加载物介电常数及入射电磁波频率成正比。
In order to achieve a scientific assessment of the quality factor Q of the reverberation chamber (RC), the influence of the reverberation chamber cavity loading on the Q and the energy dissipation in the chamber were analyzed. The load is equivalent to a series of spherical media which can absorb the reflected electromagnetic energy. The Q expression is given by calculating the absorption cross section of the medium sphere, and the reverberation chamber model is established to calculate the Q value. The relationship between Q and loading material and size was studied. The results show that the calculated results of Q are consistent with the actual measurements at frequencies> 1.2 GHz. Q is inversely proportional to the absorption cross section of the charge and is proportional to the dielectric constant of the charge and the frequency of the incident electromagnetic wave.