圆形槽波导中径向盘对阻抗的影响

应用时域有限差分法(FDTD)计算圆形槽波导中径向盘直径、厚度、位置对输入阻抗的影响。用非均匀网格和三角形网格来近似计算圆形槽波导的圆弧形金属边界附近的场值,用细网格计算径向盘中的场值,用完全匹配层(PML)模拟圆形槽波导的开放边界。最后由电压和电流的离散傅立叶变换的比值得到随径向盘直径、厚度、位置变化的输入阻抗。

The Effect of Radial Disk in Circular Groove Guide on Impedance

In this paper,finite-difference time-domain (FDTD) method was used to calculate the driving-point impedance of radial disk in circular groove guide.A simple way was used to approximate the curvilinear metal boundary of circular groove guide.And perfectly matched layer(PML) was applied to the open boundary of circular groove guide.Fine-grid was used to calculate the EM field values in the radial disk in which we were interest.At last, the driving-point impedances related to different diameter,thickness and position of the radial disk were obtained from the ratio of the Fourier transform of the voltage to the Fourier transform of the current.