II. MODELING APPROACH A. Description of TAI Setup The TAI schematic model is shown in Fig. 1. A rectangular waveguide filled with mineral oil (εr = 2.1, tanδ = 0.0002) is used as the transmitting antenna. Since the dominant mode (TE10) cutoff frequency of an oil-filled waveguide is reduced by a factor of 1/√εr compared with an air-filled one, a smaller waveguide can be used to increase the power density at its aperture. Owing to the small dielectric loss of mineral oil, the EM field attenuation in the waveguide is negligible. For practical experimental consideration, we used a flat thin plastic sheet to seal the opening of the waveguide. The waveguide is driven by a 1μs-wide square pulse modulated microwave signal generated by a high frequency pulse generator, displayed in Fig. 2.