一种基于FDTD的简单有效的天线阻抗计算方法  

FDTD Calculation of Antenna Impedance by a Simple and Efficient Method

作　　者：李朝伟[1] 吕善伟[1] 

机构地区：[1]北京航空航天大学电子工程系,北京100083

出　　处：《电子学报》2001年第12期1635-1637,共3页Acta Electronica Sinica

摘　　要：本文从有源区的软激励时Yee差分方程出发 ,推导了一种适用于理想的间隙激励 (δ gapsource)和探针激励的天线输入阻抗新的计算公式 ,该方法简洁、有效 ,公式物理意义明确 ,能够有效地消除硬激励 (hardsource) .计算天线阻抗时 ,在频率很低接近零时阻抗值的严重失真 ,使得应用时域有限差分法计算天线输入阻抗变得更加快捷适用 .最后 ,本文应用该方法分别计算了一个单极子天线和同轴馈电的微带天线 ,单极子天线的计算结果和前人的计算结果吻合得很好 ,并且消除了频率接近零时以前计算结果的严重失真 ,微带天线和已有软件的计算结果进行了比较 。A new formula, which is based on δ-gap and probe sources, to calculate the antenna input impedance by using the FDTD method is derived from Yee's difference equation. It is very simple and efficient, and reduces the errors of antenna impedance at the low frequencies near zero. The method makes it easy to calculate antenna input impedance. To check the validity of such method, a monopole antenna on a box is simulated by using FDTD, and the result shows that the errors of antenna impedance at the low frequencies disappear. A patch antenna fed by coaxial line is also calculated, and the result has a good agreement with that by another software.

关 键 词：时域有限差分法 天线阻抗 单极子天线阻抗 微带天线阻抗 

分 类 号：TN820[电子电信—信息与通信工程]