Full-wave Field Simulation Research Articles

Three-port electrical and optical model for LiTaO3 electro-optic probe with CPW test structure

A three-port electrical and optical model of LiTaO3 probes with a high-bandwidth coplanar waveguide (CPW) test structure is developed in this paper. The three-port model is constructed by combining the full wave field simulation and the neural network techniques. The three-port model has the same accuracy as the full wave modeling, but its characteristics are directly obtained from the neural network weighting parameters rather than the complicated full wave simulation. With this model, both invasiveness and waveform distortion in the external E-O sampling can be de-embedded.

FD-TLM modeling of Josephson junction circuits

Josephson junction circuits are capable of operating at high frequencies where a full-wave field simulation is needed to completely analyze the circuits. The FD-TLM time-domain full-wave electromagnetic field calculation method is extended to modeling high-speed Josephson junction (JJ) circuits by the incorporation of a model for the JJ. The JJ model implementation is described and is validated by excellent agreement between FD-TLM and conventional circuit simulations of the transient response of a JJ circuit having short interconnections. >

Full wave-field simulation of the autocorrelation of a low-frequency broadband signal in an ocean with a layered sediment bottom

From low-frequency acoustic measurements carried out over the Tufts Abyssal Plain of the Northeast Pacific Ocean, it was found that the correlations between the multipath arrivals from a broadband source can be greatly affected by the bottom sediment. As an aid to explaining these effects, the pulse version of the safari full wave-field propagation model was modified to simulate the autocorrelation of the received signal. As with the original model, the bottom environment is input in the form of a geoacoustic profile. However, the inputs to the modified model also include the source level, realistic ambient noise and sea state conditions, noise due to distant shipping, and the self-noise levels of the receiving array. Simulations were carried out using the environment of the Tufts Abyssal Plain, including a geoacoustic profile that has been developed for the area. It was found from these simulations that the distortions observed in the measured correlograms can be predicted reliably.