LAUSR

This letter presents an efficient modeling and fast simulation method for varactor diodes. By analyzing varactor diodes' circuit characteristics, the equivalent current density of varactor diodes is extracted to obtain an efficient Yee modeling. This modeling can realize the conversion between field and circuit. Besides, the efficient modeling is introduced in the leapfrog complying divergence implicit (LCDI) finite‐difference time‐domain (FDTD) method for rapid analysis of varactor diodes. Finally, the typical electromagnetic (EM) devices with varactor diodes are calculated. As demonstrated by the comparison of numerical results, the proposed method exhibits higher computational efficiency in comparison with the traditional FDTD method. Furthermore, in comparison with the leapfrog alternating direction implicit (LADI) FDTD method, it demonstrates lower storage requirements and smaller numerical errors. The proposed method supports the design and analysis of EM tunable devices employing varactor diodes.