微带天线的有限元法分析

本文提出用有限元法分析微带贴片天线。对微带馈电矩形微带贴片天线进行了计算,获得了微带天线内和沿馈线的场分布,并由此计算了微带天线的谐振频率、输入阻抗、辐射方向图等。此方法简便灵活,计算结果和实测值具有较好的一致性。

An Analysis of Microstrip Patch Antenna With Finite Element Method

Analysis of the rectangular microstrip patch antenna excited by a microstrip transmission line is presented in this paper.The finite element method is employed to formulate the fields within the cavity.The field in the interior region of the microstrip antenna is mathmatically decoupled from that of the exterior region through the use of boundary admittance as the boundary condition In accordance with the variational approach, a matrix equation can be obtained.By zolving the matrix equation,the input impedance and resonant frequency can be found.The far-field radia- tion pattern can then be calculated by means of the equivalence principle. A comparison has been made between the calculation and experimental result which shows good agreement.