Electromagnetic Emission Simulation of Radio Frequency Circuits Using Direct Domain Decomposition Solver

The increasing integration complexity and operating frequency of modern circuit designs necessitate comprehensive electromagnetic (EM) simulations for accurate performance assessment. Addressing this need, this letter presents a direct domain decomposition solver for radio frequency (RF) circuits. It incorporates nonconformal discretizations to manage multiscale geometries alongside a systematic integration of higher order absorbing boundary condition (ABC), multilevel skeletonization, and hierarchical matrix factorization. Diverse numerical techniques are developed to ensure truncation accuracy, solution stability, and computation efficiency. The proposed simulation techniques are applied for analyzing EM emissions of real-life circuits, with results validated through measurements.