矩形微带天线对电磁干扰接收特性的研究  

Study on receive characteristic of a rectangular microstrip anenna interfered by electromagnetic waves

作　　者：周怀安[1] 杜正伟[1] 龚克[1] 

机构地区：[1]清华大学微波与数字通信技术国家重点实验室,北京100084

出　　处：《电波科学学报》2005年第4期413-417,共5页Chinese Journal of Radio Science

基　　金：国家高技术高科技发展计划资助项目

摘　　要：针对微带天线在复杂电磁环境中受干扰程度的评估问题,运用腔模理论计算微带天线的辐射特性,再利用互易定理得到了接收特性。在此基础之上,引入耦合长度随来波方向的分布概率,进而提出了超过一定概率的耦合长度Lth来评估微带天线在宽频谱内的受扰特性。以一种普通矩形微带天线结构为例进行了定量分析,分析表明,矩形微带天线在较高的谐振接收频带虽然具有较大的最大耦合长度,但Lth却较小,而低接收频带则容易得到较大的Lth,最大的Lth出现在最低阶谐振频率处。To evaluate the degree that a microstrip antenna would be interfered in a complicated electromagnetic circumstance, the radiation characteristic using the cavity theory is presented and and then the receive characteristic according to the reciprocal theorem is obtained. Based on the analysis, the probability distribution of the coupling length with the direction of the incident wave is used to describe the characteristic of being interfered. To make the evaluation easy to perform in wide frequency range, the coupling length Lth that can be obtained in a certain probability is also proposed. A rectangular microstrip antenna with a normal structure is analyzed as an example in this paper. The results show that the Lth is relative small in high frequency bands while relative large in lower frequency bands. The max Lth occurs at the first resonate frequency.

关 键 词：电磁干扰 宽频谱 天线方向性 受扰概率 

分 类 号：TN82[电子电信—信息与通信工程] TN97