【摘要】 为了改进微波电路设计的数值仿真方法,在各向异性媒质条件下,将交替方向隐式算法用于时域有限差分方法,直接求解时域麦克斯韦方程,把二阶色散Lorentz媒质吸收边界条件推广到单轴各向异性情形.验证了色散媒质吸收边界的吸收效果比Mur和完全匹配层吸收边界更有效.通过对低通滤波器、贴片天线、线谐振器和螺旋电感等典型微带结构的数值仿真,验证了新提出方法的有效性.更多还原

【Abstract】 In order to improve the simulation method of microwave circuits design, a new alternating-direction-implicit (ADI) scheme is applied to the finite-difference time-domain (FDTD) method in condition of anisotropy medium to solve the Maxwell′s equations in time domain. A second order derivative Lorentz medium absorbing boundary condition (ABC) is extended to uniaxial anisotropy. The absorption effect of this ABC is validated to be more efficient than that of Mur and perfectly matched layer ABC. Some microstrip structures such as low-pass filter, patch antenna, dielectric resonator, and rectangular spiral inductor are simulated by the presented ADI-FDTD method.The simulation shows the proposed method is effective.更多还原