Impulse Response Optimization of Band-Limited Frequency Data for Hybrid Field-Circuit Simulation of Large-Scale Energy-Selective Diode Grids

Recently, large-scale diode grids have received much attention with regard to spatial electromagnetic (EM) field protection of electronic systems. The distributed nature of diode grids and the large number of elements (usually hundreds or even more) pose a challenging problem for numerical modeling. In this paper, a hybrid field-circuit simulation combining the method of moments and a causal convolution technique is proposed for transient analysis of such diode grids. Emphasis is put on the treatment of causality and passivity violations caused by incorporation of a frequency-dependent distributed multiport network into a circuit solver. Specifically, when considering a large-scale multiport network, an enhanced causal correction approach with minor passivity violations is proposed to improve the simulation accuracy and stability. For validation,
$\text{3} \times \text{3}$
and
$\text{9} \times \text{9}$
grid arrays excited by incident fields are investigated, and the results provided by the proposed method are compared to the simulation results of commercial software. Furthermore, an EM application example with a
$\text{15} \times \text{15}$
diode grid is demonstrated. The simulations show a field-intensity-dependent transmission of diode grids which is suitable, e.g., for EM protection of communication systems with sensitive electronics.