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Over the last twenty years, the evolution of commu-nications has extended the systems' operating frequency range to the tens of GHz. In this framework, time domain integral equation-based (TDIE) methods for antenna modeling have gained increasing interest. Among them, the Partial Elements Equivalent Circuit (PEEC) method turns out to be attractive for its capability to provide compact circuit models. Similarly to other integral equation-based methods, like the method of moments (MoM) in the time domain (TD), the PEEC method can suffer from late-time instabilities. This work shows that a rigorous computation of the time-dependent partial elements leads to an improved TD formulation of the PEEC method that exhibits better behavior at high frequencies. This is the fundamental premise for having more stable results, preventing the late-time instabilities from appearing in the time domain.
Loreto et al. (Sun,) studied this question.