摘要
从理论上分析了等效吸收截面与混响室内场强的关系,得到了场强的极简表达式。与加载系数不同,等效吸收截面具备可加性,仅与加载件本身引入的损耗有关。通过研究混响室内的损耗机制,给出了混响室归一化场强的理论极限。理论分析与测试结果表明:当频率较低时,发射天线的吸收截面占主导因素,通过减小腔体自身损耗来提升场强已无必要;减小腔体自身损耗有助于腔体空载或低加载时场强的提升;当加载效应占主导时,减小腔体自身损耗不能显著提升场强。
The relationship between the effective absorption cross section and the E-field strength in a reverberation chamber is analyzed,and a greatly simplified E-field expression is obtained.Different from the chamber loading factor,the absorption cross section can be superimposed and is only related to the inherent property of the object.By investigating the loss mechanism in a reverberation chamber,the limit of the normalized E-field strength can be obtained.Theoretical analysis and measurements show that it is not necessary to reduce the loss of the cavity when the frequency is low,the absorption cross section of the transmitting antenna dominates the total loss at low frequencies;the E-field strength can be improved by reducing the loss of the cavity when the cavity is slightly loaded or unloaded;when the loading effect dominates the total loss,it is not significant to increase the E-field by reducing the loss of the cavity.
作者
徐千
程二威
王平平
沈学其
Xu Qian;Cheng Erwei;Wang Pingping;Shen Xueqi
基金
国防基础科研计划(JCKYS2021DC05)
南京航空航天大学前瞻布局科研专项资金资助。
关键词
电磁混响室
加载效应
吸收截面
electromagnetic reverberation chamber
loading effect
absorption cross section
